UK Prefabricated Steel House enterprise- China Factory Manufacturers Suppliers

Residential steel building is a residential system composed of an envelope structure and a steel supporting structure. It is a new type of energy-saving and land-saving residential system. Its steel structure residence abandoned solid clay bricks and effectively used land resources. Compared with traditional houses, steel structure houses have advantages in terms of use function, design, construction and comprehensive economy.

• What are the reasons why people choose Residential steel building?

• What should the choice of Residential steel building structural system look like?

• What is the framework system used by Residential steel building?

What are the reasons why people choose Residential steel building?

1. Residential steel building energy saving and environmental protection

The main body of the Residential steel building is steel components, and the wall material is thermal insulation mortar, which not only meets the requirements for energy saving, but also can be recycled. It is a green and environmentally friendly recycling building that meets the requirements of sustainable development. The thermal resistance can reach a brick wall thickness of about 1m. At present, the global population is large and energy consumption is large, and the promotion and application of steel structure housing is the final choice.

2. Residential steel building's pipe network line layout is convenient

In residential buildings, there are many lines of professional plumbing and electricity pipe network, which will reduce the effective use area in traditional buildings. In Residential steel building, there are many holes or holes in beams and columns, which is easy to form a cavity for wiring layout. Moreover, the beam can be artificially made into a honeycomb shape, which is convenient for line layout, which not only saves the net height of the building, but also increases the use area.

What should the choice of Residential steel building structural system look like?

According to engineering practice, the commonly used Residential steel building structure system can be selected with reference to the following scope:

The 4th to 6th floors are the steel frame system, the steel frame-support system, and the steel frame-shear wall system; the 7th to 12th floors are the steel frame-concrete core tube (shear wall) system.

The section form of steel components should be hot-rolled H-section steel, high-frequency welded H-section steel and steel tube concrete.

What is the framework system used by Residential steel building?

Light steel frame system

The light steel frame system is a load-bearing frame composed of hot-rolled H-shaped steel (or I-beam), high-frequency welded H-shaped and cold-formed square pipes, and a steel structure residence with composite curtain walls or infill walls as the enclosure structure system.

The wall panels in the picture collection are made in the factory with fly ash as the filler, sulfoaluminate as the cement, polystyrene foam (EPS) as the core material, and glass fiber mesh as the reinforcement material. A lightweight board. Special adhesive is used to bond the plate and the light steel frame, and between the plate and the plate. To prevent thermal bridges using double-layer plates.

Qingdao Xinguangzheng Steel Structure Co., Ltd., as a leading company in China's Residential steel building, has committed to providing the most suitable Residential steel building at a reasonable price, and whatever it takes to satisfy the customer’s needs.

Residential steel building has entered a new stage of development. Relevant specifications and design standards have been issued and implemented one after another. In addition, the supply of steel is sufficient. A batch of Residential steel building trial construction experience and scientific and technological achievements continue to be presented. The development of Residential steel building Have a good material and technical foundation

• How will Residential steel building develop in the future?

• What should be considered before building Residential steel building?

• What are the issues that need to be considered when constructing Residential steel building?

How will Residential steel building develop in the future?

Due to the flexibility of Residential steel building design, in addition to high-rise buildings, low- and multi-storey residential buildings also have good adaptability for the residential system. At the same time, the development of villas in low- and multi-storey houses can use light steel structures such as cold-formed C-shaped steel or Small hot-rolled steel forms a keel structure system; high-rise buildings can use hot-rolled H-shaped, welded H-shaped, welded box-shaped, cold-formed thin-walled square steel pipe filled with concrete, round steel pipe filled with concrete, etc. to form a steel frame body and steel support frame system , Steel frame concrete shear wall system, etc.; while building villas and rural buildings, wall column systems can be used.

What should be considered before building Residential steel building?

1. The cooperation between building equipment and Residential steel building is the first problem encountered by residents. Therefore, how to use advanced technology to develop various equipment suitable for steel structure residence is a problem we must solve.

2. The cost of Residential steel building is the most concerned issue of real estate developers. Steel structure residence should be located in medium and high-grade residence. Steel structure residence building is a systematic project. Management and coordination should be strengthened from the links of design, manufacturing, transportation, installation, maintenance and management, so as to reduce costs and improve comprehensive economic benefits.

What are the issues that need to be considered when constructing Residential steel building?

1. Selection and development of exterior wall panels for Residential steel building is one of the key issues in the promotion of steel structure residential buildings. In addition to meeting the technical requirements of exterior wallboards, it is also necessary to make wallboard raw materials suitable for local conditions, work-oriented production, transportation, installation and connection.

2. The structure of Residential steel building should be safe and reasonable, the node structure should be convenient and reliable, and create conditions for component production, transportation and hoisting.

3. The seismic performance of Residential steel building has a lot to do with the regularity of structural layout. The structure layout is irregular, it is easy to be damaged during an earthquake, and in addition to the elastic design, the elasto-plastic layer displacement check calculation is also required. Therefore, we should try our best to make the structural layout meet the regularity requirements.

Overall, the important role of Residential steel building in our daily lives is perceived by more and more people. Qingdao Xinguangzheng Steel Structure Co., Ltd. strives to offer high quality Residential steel building at reasonable prices, efficient production times and the most professional customer service.

Mexico galvanized prefab steel layer house building with cages Project

Project address: Mexico

Area: 120m * 16m * 7m

Detailed parameters: Hot-dipped galvanized steel beam, steel column with zinc thickness 100um. Purlins are 275g/m² zinc which

 life span can reach 15-20 years.The reasonable design of the feeding regulator ensures the regulator move stably, and the birds will not run away and get stuck.

Introduction of Zhongjie era Steel Structure Frame Overpass Project 

Zhongjie Times Square overpass project is the first Cross Street overpass project in Pingdu. The whole project is composed of three overpasses. The length of the straight overpass on the east side is 56.3 meters and the width is 5 meters. The length of the straight overpass on the west side is 49 meters and the width is 5 meters. The diameter of the main bridge surface of the central circular overpass is 56 meters. The narrowest part is 6.5 meters and the maximum width is 12 meters. The construction of the overpass on Hongqi Road can avoid the interference of people and vehicles To improve the road capacity, and effectively solve the problem of efficiency and safety of a large number of people crossing the street.

After completion, it will become the most characteristic commercial block with urban flavor in the main urban area of Pingdu City, as well as the landscape landmark and cultural landmark of Pingdu.

Residential steel building is lightweight and high-strength. For buildings of the same weight, the steel structure has a small cross-section and a large net height, which can save building height. The number of layers of steel structure is more than that of concrete, which not only increases the building area, but also brings good economic benefits.

• What are the advantages of Residential steel building?

• What raw materials should be used for the walls of Residential steel building?

• What is the roof system of Residential steel building?

What are the advantages of Residential steel building?

1. Superior seismic performance

Compared with traditional residential structures, Residential steel building is a flexible structure and has a lighter weight. Therefore, buildings with the same fortification intensity and the same site will bear less seismic force, and the earthquake disaster caused by them will be weakened accordingly. The use of steel in the earthquake zone Structural housing will reduce casualties and property losses, with considerable comprehensive benefits.

2. Flexible layout and increased effective use area

Residential steel building adopts steel structure, which can realize large span under the premise that the cross-section is not too large, which makes the building function very flexible and can be flexibly arranged according to the needs of residents, which is conducive to meeting the needs of modern homes and adapting The needs of the modern housing market. Moreover, the steel structure is adopted, the cross-section of the beams and columns is small, and the use area of the residents is increased at the same time.

What raw materials should be used for the walls of Residential steel building?

Residential steel building's steel frame system, steel frame-support system, steel frame-concrete core tube (shear wall) system outer walls can be filled with small concrete block walls, autoclaved lightweight aerated concrete slabs, and prefabricated reinforced concrete walls Board, steel wire mesh frame polystyrene sandwich panel, fiber cement external wall hanging panel, polyurethane composite external wall panel, metal surface embossed composite panel, etc. The inner wall can be made of glass fiber strong gypsum hollow board, fiber cement board infusion (foam concrete) wall, light composite wall board, etc.

What is the roof system of Residential steel building?

1. The flat roof of the Residential steel building adopts steel beams (I-beam, C-shaped steel), prefabricated reinforced concrete roof panels, and thermal insulation and waterproof layer.

2. The sloping roof of Residential steel building adopts portal frame, truss, light steel keel truss (bracket), I-shaped (or C-shaped) and steel purlin, colored cement tile, colored steel plate tile and colored asphalt tile roof. Thermal insulation and waterproof layer should also be used in the slope roof. The thickness of the insulation layer is determined by thermal calculation and meets the requirements of energy-saving design standards.

It is an important choice in residential building construction. A good Residential steel building starts with the best engineering staff, and Qingdao Xinguangzheng Steel Structure Co., Ltd. is always ready to help you meet your technical and practical requirements.

Agricultural steel building components or parts are usually connected by welds, bolts or rivets. Because of its light weight and simple construction, it is widely used in various fields of agricultural production. Steel structure is easy to rust. Generally, steel structure needs to be derusted, galvanized or painted, and it needs to be maintained regularly. Here we are going to know more about the Agricultural steel building.

• What are the architectural characteristics of Agricultural steel buildings?

• What are the appearance characteristics of Agricultural steel building?

• What should be paid attention to when constructing Agricultural steel building?

What are the architectural characteristics of Agricultural steel buildings?

1. Industrialization of the production process. The steel structure is only connected by high-strength bolts. It also has the advantages of quick installation and return on investment.

2. Use high-quality materials with high toughness and plasticity. The quality is safe and reliable.

3. It also has the advantages of flexible design and decoration, low cost, and various colors.

What are the appearance characteristics of Agricultural steel building?

The Agricultural steel building has no beams and no purlins, wide space, large spanning capacity, and the span of 6-32 meters can be chosen at will. Low cost, low investment, economical. The design and construction period is short,

The roof construction of Agricultural steel building can be completed in 20 days. Colored galvanized steel sheet, mechanical seam connection, natural waterproof, no leakage.

The Agricultural steel building is beautiful in appearance, sturdy and durable, and requires no maintenance.

The Agricultural steel building is light in weight, the overall structure is scientific and reasonable, and the wind and seismic performance is superior. Wind resistance and snow load, can withstand strong winds of 160km/n per hour, and can withstand a snow load of 148kg.

The shape of Agricultural steel building is beautiful, colorful, novel and full of rhythm. Rich and diverse roof forms give the building a new appearance.

The Agricultural steel building has complete functions, the roof slab and beam are integrated, and it integrates multiple functions such as heat preservation, heat insulation, ventilation, and lighting.

What should be paid attention to when constructing Agricultural steel building?

1 Personnel engaged in high-altitude operations must hold a certificate to work, and earnestly abide by the safety construction regulations, wear flexible clothing, and it is forbidden to wear hard-soled and slippery shoes with nails;

2 Workers of Agricultural steel building wear safety belts;

3 A safety net is set under the working surface of Agricultural steel building;

4 Materials for high-altitude operations should be stacked steadily. They should not be placed on the edge or attached to the opening of the hole. If there is a possibility of falling, they should be withdrawn or fixed in time to prevent falling objects from injuring people.

The Agricultural steel buildings made by Qingdao Xinguangzheng Steel Structure Co., Ltd. feature attractive appearance, excellent performance, easy maintenance, and internationally advanced performance indicators, and are exported to more than 10 countries and regions.

Project Introduction:

Solomon office project is a two-story frame structure, with a building area of more than 1500 square meters. The first floor is maintained as aluminum-plastic plate curtain wall and part of glass curtain wall, the second floor is maintained as glass curtain wall, the roof is glass wool composite plate, and the parapet part is aluminum-plastic plate.

Personnel involved in design and construction refinement: Liu Kangning, Jing Yanyan

Total project amount: 2.94 million

Detailed address: Honiara, Solomon Islands

The following project related parameters:

Area: 1500 square meters

Eave height: 7M

Ridge height: 8M

Number of floors: two

Wind speed: 176km / h

Load: second floor load: 450kg / m2, roof: 30kg / m2

Shapes: Framing

Steel consumption: 90 tons

Purpose: Salomon Telekom office and warehouse

Detail of Prefabricated Steel Structure Building Office in Solomon

Main Characters of prefab steel warehouse

· Super Aseismatic

Most part of the structure will be consisted of cold formed steel members, this system aseismatic grade can reachto 8.

· Wind Resistance

Steel structure building has the performance of high strength, solid rigidity and good deformation capacity, can resist strong wind for 50m/s.

·Durable

The steel material will be painted or galvanized as customers' requirement to be more anticorrosion and rustproof, the lifespan of the structure can be reach to 50~70 years.

·Heat Insulation

Sandwich panel can improve the insulation performance of the building, effectively avoid the phenomenon of "cold bridge" wall

·Environment Protection

Little waste for pollution in construction, 100% steel structure materials can be recycled, most of other related materials also can be recycled.

·Easy and Fast Build

Dry construction, will not influenced by the weather and environment, save much time and labor cost. One 300m2 steel structure building, can be finished in 30 days by only 5 workers.

Ⅰ. Steel column installation for steel structure construction

1. Installation sequence of steel column:

① Foundation setting out → ② binding → ③ hoisting → ④ correction → ⑤ final fixation

2. Installation method of steel column:

(1) Setting out:

A. Elevation control:

In this structural steel construction  project, iron parts and "middle bars" are controlled according to the depth of concrete cup mouth, the elevation of steel column bottom and the embedded elevation in the center of the bottom of the cup mouth during the construction of concrete foundation (φ30 steel bars), the elevation of top surface of "middle reinforcement" is based on the elevation of steel column bottom, and the elevation error of iron parts is controlled in ± Within 1mm.

To ensure the steel column is embedded in the foundation accurately and firmly φ On the 30 "middle reinforcement", weld a steel plate with thickness of 20 at the bottom of H-shaped steel column, as shown in the figure below.

When installing structural steel column, clean the foundation cup mouth first, and check the embedded elevation control "middle reinforcement" in the foundation（φ The actual height of 30 steel bars) is not necessary because the elevation embedded in the foundation construction has been controlled precisely, and no additional iron pad is needed. The method is simple, fast and efficient for the treatment of steel column feet. The construction is fast and the force is reasonable. When the column is lifted, it can be adjusted freely in several directions when the elevation is unchanged.

B. Before installation, the vertical and horizontal axis reference lines of the foundation plane shall be placed on the top of the cup mouth by woodworking ink bucket as the installation and positioning line of steel column.

(2) Column binding and hoisting:

A. after the steel column enters the site, the steel column shall be arranged according to the position of the lifting plan, and the model and number shall be checked to see if they are correct. The plane position of steel column after entering the site is shown in the following figure.

B. Before the column is lifted, a horizontal line shall be drawn with red oil paint 2300mm upward from the bottom of the column, so as to recheck the plane elevation datum before and after the installation and fixation.

C. the column installation belongs to vertical hoisting. In order to keep the suspended column drooping and facilitate the positioning, the binding point is determined at the lower part of the bracket. In order to prevent the sharp edges and corners of the column edge from damaging the lifting rope during hoisting, the rubber belt of the old car is used to separate and cover the edge and corner lifting rope. Pay attention to binding firmly and easy to remove.

D. temporary steel ladder and high-strength bolt installation fixture of working platform shall be bound on the steel column.

E. in order to avoid the free swing of the suspended column, hemp rope should be used to tie the upper part of the column bottom as a restraint rope and adjust the direction.

F. according to the site conditions, the rotation method is adopted for hoisting

After the preparations before hoisting are ready, the trial hoisting shall be carried out first. When the height of the steel column is 200 mm above the ground, the hoisting shall be stopped to check whether the rigging is firm and whether the crane is stable. After confirming that there is no problem, the crane can be directed to slowly lift, rotate to the top of the cup mouth, and then slowly descend. When the distance between the bottom of the column and the design position is 40-100 mm, adjust the two datum lines of the column body and the foundation to reach the accurate position, direct the crane to descend to the position, and temporarily fix the column with steel wedge (or wood wedge) and wind rope to remove the hook.

• Key points of rotation method:  

The method of lifting the column by rotating the column around the column base is called rotation method, as shown in figure a below. When the column is hoisted by rotation method, in order to improve the hoisting efficiency, when the steel column enters the site, the binding point of the column, the center of the column base and the center of the cup foundation should be placed on the arc with the crane stop point as the center and the distance from the stop point to the binding point (i.e. the turning radius of the column), as shown in Figure B below.

The steel column hoisting is shown in the figure below:

(3) Preliminary correction of column:

  The column should be corrected on the side with large deviation first, and then on the side with small deviation.

A. The correction of column generally includes plane position, elevation and perpendicularity.

B. When the steel column is hoisted in place, it is one-time alignment, and generally it does not need plane re correction. For the elevation of the column, it has been used before hoisting φ The embedded "middle reinforcement" can accurately control the elevation. Generally, it only needs to be checked, and it does not need to be corrected. Therefore, the steel column correction is mainly to correct the verticality and recheck the elevation.

C. In this project, the perpendicularity of the column is observed, and two theodolites are used for measurement and correction.

• First, place the theodolite on one side of the column, align the longitudinal center wire with the baseline of the column base, and then fix the screws of the horizontal plate.

• Measure the center line of the column and observe from bottom to top. If the vertical center line is aligned, that is, the column is vertical. If it is not aligned, the column shall be adjusted until it is aligned with the longitudinal center line of theodolite.

• Measure the horizontal line in the same way so that the center line of the other side of the column is perpendicular to the horizontal axis of the baseline. After the column is accurately positioned, the column can be fixed.

• Verticality correction of steel column: distance adjusting screw rod and steel wedge are used. Due to the small contact surface of the long side of the column, the base plate is set during the construction. The details are as follows.

The manufacturing dimension of steel wedge is shown in the figure below:

(4) Final alignment and fixation of steel columns:

After the steel column is hoisted in place, the column correction mainly involves the adjustment of elevation and the correction of verticality; The correction method can use tools such as wind rope, Jack, crowbar and steel wedge (or wooden wedge) to apply vertical force and lateral force of pulling, jacking, supporting and prying to the steel column.

Adjust the verticality, positioning axis and elevation of the column. After confirming the correctness, the gap between the steel column and the foundation cup mouth shall be poured with C40 fine stone concrete. The expansive high strength grouting material is preferred.

Ⅱ Protection of site components:

1) The unloading of components shall be careful to prevent damage and prevent collision and extrusion between members.

2) The members shall be stacked in order at the designated site, and the number of layers stacked by steel beams shall not exceed 3 layers to prevent the members from squeezing and deformation.

3) Before hoisting, oil, sediment and dust on the surface of the components shall be cleaned.

Ⅲ The placement of components and the requirements for the site

1) When unloading, the components are unloaded directly near the installation position and within the radius of rotation of the crane. Mark the number clearly with a clear color pen to facilitate lifting.

2) The components are placed in order in the site, and a certain gap is reserved between adjacent components to facilitate binding.

3) The site shall be solid and flat, and the components shall not be polluted due to rain and snow, and the vehicle with 30 ton level can be walked.

Ⅳ Steel structure building installation

Preparation before hoisting of steel column:

Before hoisting the steel column, the cable wind rope shall be tied to the column body. The lifting point shall be at the bracket position, and the double wire rope shall be set up and down, and the snap ring can be checked to be qualified before entering the next work. Before hoisting the steel column, the positioning axis, foundation axis and elevation, cup opening size and the height of the bottom standard of the steel column must be inspected and handed over and accepted. The number, outline dimension, screw hole position and diameter of the steel column shall be comprehensively reviewed. After confirming that it meets the requirements of design drawings, draw out the installation center line and the lower end elevation line of the steel column.

Ⅴ Steel column hoisting

(1) installation method of steel column

Before lifting the steel column, the wooden board shall be fixed at the column foot to prevent damage to the column foot and other structures.

Special hoisting steel wire rope is used for steel column binding. Wood or rubber sheet shall be used to prevent damage to the steel column.

The steel column is installed by a 25t truck crane. When the steel column is lifted, the crane shall hook and rotate the arm while lifting the steel column to make the steel column vertical away from the ground.

(2) positioning adjustment and temporary fixation

When the steel column is lifted to 200mm above the base cup mouth, it will be stable, and it will fall slowly at the base cup mouth. Avoid hitting the concrete edge of the foundation cup mouth during falling. After implementation, use special angle ruler to check, adjust the steel column to make its positioning line coincide with the foundation positioning axis. Three people are required to operate the adjustment, one person moves the steel column, one person helps to stabilize and the other person conducts the test. The positioning error is controlled within 2mm.

(3) when adjusting the elevation of the steel column, place the pad iron at the bottom of the cup foundation, use the level to super level the bottom plate elevation of the steel column as the top elevation of the pad iron, so that the elevation after the steel column is in place can meet the design elevation requirements, mark the elevation datum point on the column body, and then use the level to measure the installation elevation after it is installed in place.

(4) the verticality of the steel column shall be preliminary adjusted by the level ruler. Then two theodolites are used to observe from both sides of the column at the same time, and the adjustment is carried out by relying on the cable wind rope. As shown in the figure below:

Diagram of verticality adjustment of steel column

(5) after the adjustment, use eight iron wedges to position the gap between the bottom of the steel column and the base of the cup mouth, and then spot weld the column to make it stable.

Ⅵ Steel beam installation

Steel beams must be stacked in order on site for this steel work in construction. Sleepers must be placed in the middle of each layer of steel beams. Two lifting points for steel beam hoisting are selected on both sides of the center of gravity of the steel beam. The two lifting points should be 800mm away from the support and the middle of the span, and the distance between the two lifting points should be increased according to the length of the steel beam.

To ensure safety and prevent the sharp edge of the steel beam from cutting the steel wire rope, the steel wire rope shall be protected, the angle of the sling shall not be less than 450, and the steel beam shall be directly tied and rolled with the steel wire rope or lifted with a special fixture.

Before hoisting the steel beam, install the safety rope on the steel beam. When hoisting, hang two sliding ropes at both ends of the steel beam. Two people pull two sliding ropes respectively. The hoisting speed of the steel beam must be slow. In order to ensure safety, personnel should not stand directly under the beam. The cloth bags specially used for placing high-strength bolts are put on both ends of the steel beam. When the steel beam is hoisted above the position, the steel beam is put in place. The falling speed of the steel beam is controlled at 3m / min. two installers are arranged at both ends of the steel column head to prepare for the installation of the steel beam. When the steel beam is close to the in place position, two installers should hold the upper flange of the steel beam with their hands respectively, drag the steel beam to the in place position, and prepare to install the high-strength bolts.

Ⅶ Installation of retaining structure and support corner brace

1) Installation of roof purlin: when the main structural steel forms a frame section, the roof purlin is hoisted to the main beam of the roof with a crane and installed manually. The purlin can also be manually pulled onto the roof with a white synthetic rope for installation. After the installation of purlin, the purlin support is installed in time.

2) Wall purlin installation: when the main structure forms a frame section, the construction personnel stand on the scaffold platform and pull the wall purlin to the installation position with white comprehensive rope.

3) Corner brace installation: after the main body is welded, the corner brace is connected.

Ⅷ Measurement and correction of steel column

Verticality correction of steel column

When the steel column is installed and corrected, two theodolites are set up on the control line with 90 degree translation of 1 meter each other, and the theodolite operators observe the small steel ruler on the top of the column, measure the deviation of the steel column and direct the correction.

A. Control the verticality of the steel column between the first hoisting joints.

B. Steel column calibration is divided into four steps:

 initial calibration during initial tightening; Re-calibration before final tightening; Tracking and monitoring during welding process; Final result measurement after welding.

The perpendicularity can be roughly controlled with a long level before the initial tightening, and it can be accurately corrected after the frame is formed. After welding, retest shall be carried out, and the measurement results shall be compared with those at final tightening, so as to be the basis for the next construction.

C. Verticality measurement method of C steel column

Initial correction: the perpendicularity of the steel column is preliminary adjusted with a level ruler.

Accurate correction of steel column perpendicularity: one column grid is used as an installation section for the hoisting of the main frame until the hoisting of three continuous complete sections is completed

After the whole is formed, the measurement correction can be inserted. Two theodolites are used to observe from both sides of the column at the same time, and the wind rope is used for correction and adjustment.

Ⅸ Steel structure survey

2) Elevation control of steel column

Based on the elevation reference point of the plane layer where the steel column is located, the deviation value of the horizontal elevation of the steel column is measured with the level gauge and the correction is directed.

3) Steel beam measurement

After the steel column is hoisted and corrected, the +1.00m control point shall be measured to each steel column according to the site level as the basis for vertical transfer of elevation and the elevation of beam installation; Pop up the center line of the steel beam on the surface of the steel beam.

The control axis is measured to the column body to control the beam position offset; The accuracy of beam elevation is controlled according to the control point of column elevation. Set up theodolite on the floor platform, and then look at the cross angle to the axis of the corresponding beam. Aim at the center line of the upper surface of the beam to the other end with theodolite to see if the number coincides with the axis of the beam.

Calculation of survey and lofting data

In this project, the computer automatic query method is used to calculate the survey and lofting data. The specific steps are as follows:

1) The establishment of data model

Firstly, according to the design coordinates and the dimension relationship of each building in the design drawing, the building, building axis, control line to be lofted and so on are drawn in AutoCAD according to the proportion, and the data model is established.

2) Survey and lofting data query

After drawing the survey loft data model, the survey loft data such as the angle and distance between the known basis (axis control pile, lofted axis, etc.) and the control line to be lofted are queried by using the command of dist of AutoCAD.

3) Advantages of computer automatic query

The method of computer automatic query is used to obtain the required measurement and positioning data. It is not only convenient to calculate, but also has high precision. The distance precision can be set to 0.1mm, 0.01mm, and the angle precision to 0.0 ", 0.00" or higher according to the actual situation.

Ⅹ Construction of high strength bolt

1. Preparation before installation

1) Test and inspection of high strength bolt

Anti slip coefficient test

The project adopts class 10.9 large hexagon high-strength bolts. The anti slip coefficient test of high-strength bolts shall be conducted by taking the most representative thickness of the plate in the project for test, and three groups shall be made.

The size of the specimen plate is as follows:

Axial force test

Randomly select the bolts to be installed at the construction site, and 8 sets of bolt pairs are selected for re inspection in each batch.

2) Transportation and storage of high strength bolts

transport

The form, size and technical conditions of high-strength bolt connecting pair shall be manufactured and supplied by the manufacturer according to batch, with factory certificate and high-strength bolt connection pair, which shall conform to the provisions of national standards gb1228-1231-84 and gb3632-3633-83. High strength bolts with large hexagon for steel structure

The connecting pair consists of a bolt, a nut and two washers. The combination of use shall meet the national standards, and the high-strength bolt connection pair shall be supplied with storage and transportation in the same batch.

The high-strength bolt connecting pair shall be installed and placed lightly during loading, unloading, transportation and storage to prevent the packing box from being damaged or damaged.

Storage of high strength bolt warehouse

1. the high-strength bolt connection pair shall be cleaned according to the specification, batch number and supply date of the packing box, and shall be kept in the indoor warehouse, and the accumulation shall not be higher than 3 layers. The indoor moisture-proof, long-term dry, rust and dirt contamination shall be prevented, and torque coefficient shall be prevented from changing. The bottom layer shall be more than 300mm above the ground level.

2. when installing on site, the quantity of high-strength bolts required on the day shall be issued. The rest should be kept properly. Do not put it in disorder, damage the thread, and be contaminated with dirt.

3. before using the long-term storage high-strength bolt connection pair, a comprehensive quality inspection shall be conducted again. If any abnormal phenomenon is found after unpacking, the inspection standard shall be conducted according to the relevant provisions of national standards gb1228-1231-84 and gb3632-3633-83. It can be used after being qualified.

3) Construction management of high strength bolts

1. Construction Manager

When carrying out the construction of this high-strength bolt, the high-strength bolt manager shall be determined first to be responsible for the project management, quality management and guidance of the construction personnel.

2. weather management (climate conditions)

In principle, no operation shall be carried out during rainfall and snowfall. If rain or snow fall occurs during operation, the speed shall be accelerated to lock the unfinished ones

3. friction surface management

Before tightening, the friction surface shall be inspected first. If there are any attachments to reduce bearing capacity of friction surface, such as rust, oil, paint and residue, metal brush, sandpaper and oxygen acetylene flame shall be used for removal.

4) Construction of high strength bolts

1. final tightening of temporary bolts

Before inserting high-strength bolts, temporary bolts shall be used to tighten the connection tightly, if the materials of the connection parts are bent or warped, they shall be corrected.

If the difference of holes is within 2mm, it can be corrected by cutter.

If the difference of holes exceeds 2mm, reasonable treatment methods such as replacement of panel shall be adopted based on consultation with management personnel, and gas cutting and reaming are not allowed.

2. high strength bolt insertion

The nut and gasket of high-strength bolt shall pay attention to the installation direction, and install according to the following figure.

When inserting bolts, pay attention not to attach rust, dust, oil, etc. to the bolts. In addition, do not force into the bolt hole during construction to avoid damaging the thread.

3. initial tightening

After the temporary fixing bolts are locked, confirm the compactness of the components.

After initial tightening, mark with white marker through bolt nut, gasket and component.

When using the inspection wrench, although the torque value can be confirmed by the contact sound, it is easy to over tighten if the mechanism continues to apply force, so it should be noted.

4) Final tightening

After initial tightening, use special fastening wrench to lock until the neck is broken.

In principle, the bolts inserted on the same day shall be screwed out on the same day.