Guangzhou Steel Structure Installation general steps (more detailed)
Guangzhou Steel installation general steps:
First, prepare the steel structure installation Guangzhou
(one). Ready to work
1, the construction organization design and construction organization design of steel structure installation should provide a brief description of the project before, comprehensive statistical quantities, the correct choice of construction machinery and construction method, layout reasonable installation sequence, mainly installed elaborate technical measures, developed strict quality standards and safety installation standard, serious preparation of project schedules, workforce planning and materials supply plan.
2. Check the pre-construction inspection of construction before the retest, including acceptance, construction equipment and measuring instruments and inspection of steel components based.
(1) Acceptance of Steel member steel members should be construction plans and specifications for acceptance. Steel member is transported to the site, the manufacturer shall provide factory certificate and the following technical documents:
① design and design modification documents;
② quality steel single or test report and supporting material;
Test test data ③ high strength bolt friction coefficient;
④ plant one or two types of weld inspection reports;
⑤ steel members geometry inspection reports;
⑥ member list. Installation of this unit should be acceptance, and the actual condition of the structure retest. If the member is damaged in transit, require the production plant must be repaired.
(2) inspection before installation and construction equipment and measuring instruments for important hoisting machinery, tools, wire rope and other accessories shall be tested to ensure reliable performance have to ensure the smooth and safe installation. When installing the measuring instrument has to be regularly assigned to the National Bureau of Standards testing unit for testing, calibration, to ensure accuracy of the measurement standard.
3, based retest. Steel is fixed in reinforced concrete base (base, capitals, corbels, etc.) on. Thus the base and anchor bolt accuracy, strength to retest. To retest the base level of the base surface elevation, roughness, horizontal position deviation anchors, anchor bolts embedded in the accuracy of the determination made. And the retest results and corrective require delivery of the base construction unit.
4, preparation of installation plans and component supply plan, organize construction.
5, check the steel components: Steel Factory member should have factory certification, drawings before installation press review enumeration member, the member is installed in accordance with the order arrived within the scope of the installation, without affecting the installation conditions as far as possible on the installation member lower position to ensure the installation convenience.
6, installation of steel columns: first determine before lifting member hanging position to determine banding method, take appropriate precautions when lifting. After lifting steel columns when the column foot anchor bolt from about 30-40CM when righting the mounting bolt hole pedestal alignment, slow-fall in place. After the beginning of the school to be vertical deviation within 20MM, tighten the bolts temporarily fixed to decoupling.
7, steel girder lifting: lifting steel beams after completion of the review column, lifting into place using two symmetrical banding installation hoisting steel beams. After lifting steel beams from the column reference plane 100MM slowly slowly in place, be adjusted to be corrected hoisting steel beams, then a fixed connection. With hanging with the theodolite corrected any time to correct deviations when hoisting steel beams.
8, wall purlins installation: purlin cross-section smaller, lighter, and more using a hook or a hanging piece lifting method for lifting. Purlin correction is mainly the size and spacing of their own flatness. Check with the kind of pitch along the rod to move back and forth between the bar purlin members, subject to error, to relax or tighten the bolts corrected. Flatness ruler with cable and calibration checks, and finally bolted.
9, the installation correction
①. Steel Column Correction: vertical steel columns correction theodolite or hanging wire hammer test, when the deviation is corrected using the jack, jack the base elevation correction a little elevation, and then increase or decrease the thickness of the plate, tightly immediately after the column foot correction is correct after solid anchor bolts, steel columns until the correct overall correction pouring fine stone concrete column under the soles of the feet fixed.
②. Steel Beam Correction: steel beams and vertical axis of the measurement correction, the correction performed using the jack, fixed immediately corrected.
(two). Wall plate mounting pressure-type color
1. Preparation before construction
①, before the steel sheeting envelope construction and installation, custom corresponding construction drawings, and design and construction personnel training and production safety tests, according to the design documentation organization.
②, detailed check based on the file size and number of types of materials, damage to the pressure plate, flashing boards should be repaired and replaced.
③, various types of construction equipment should be complete, and can operate normally.
④, review and steel sheeting construction installation precision steel components relevant, clear coating installation weld spatter and purlins, and brushing the anti-rust paint for corrosion protection.
2. Pressure-type color plate construction process: Siding installation by purlins from one location to start, must clenched between the board and the board, and then screws, drywall seams well water treatment. When the pressure plate is installed, it should be laid side edge to adjust its position, while fixed.
(III). Floor bearing plate installation
Before floor bearing plate construction, installation, drawing the appropriate row board diagram, according to the construction drawings. Pressure plate along one end of the floor to start laying, laying side edge to adjust its position, while fixed. Entrance case, install pressure plate, then cut the hole sizes according to the actual position of the hole.
Second, the installation of steel Stability member monomer stabilization and structural overall stability
1, the monomer component monomer stability stable member refers to a member at the site stack, from the pull, lifting, bending occurs in place during bending and torsion destruction and instability. Thus for thinner and larger member should consider this issue.
2, the structure of the overall stability of the overall stability structure refers to the structure in the lifting process support system has not been formed, the structure must bear some of the load (including weight). Therefore, in the formulation of the lifting sequence must fully take into account this factor, to ensure that each step in the process of lifting the structure is stable. If the problem can be added other measures to resolve the temporary wind cable.
Third, Guangzhou Steel installation and connection problems
Live connection mainly ordinary steel bolts, high strength bolts connecting and welding.
1, ordinary bolt connection, mainly used by ordinary bolt bending, pulling node. In the main bolt tension. Plus an appropriate prestressing, the shear structure are also used extensively for transmission towers and other connections. After ordinary bolt tightening, exposed threaded be not less than 2-3 button. Common locking bolt should measures, such as double-locking nuts or fastening nut. Bolt hole misalignment smaller reamer or rasp can be used to repair holes, gas cutting may not be used to repair holes.
2, high-strength bolts, high strength bolts connecting ships directly for important structures to withstand dynamic loads in. Its main feature is to pass through the shear contact surface friction. Therefore, when high-strength bolts installed, practices and rough friction surfaces must be processed according to specifications. Secondly, also for the friction coefficient and torque coefficient test. When you install unscrew the torque to be measured at the beginning and end of the bolt screwing torque.
3, site welding, site welding plant with welding inspection
(1) the design of the site should be avoided in soldering
(2) prevent the adverse weather conditions (rain, wind, cold climate) on construction
(3) reduce the adverse welding station (construction site operation can not rotate, only overhead welding, it is difficult to even settled welding personnel) influence in the process of lifting the steel should pay attention to the problem of the column, when the beam is installed, the main inspection horn column beneath the floor mat whether real, pad level, whether vertical column and the availability of displacement, the degree of vertical and lateral bending vector high primary and secondary beam. After the installation of steel structures formed spatially fixed unit and acceptance, it will require the construction unit in time and space column base plate top surface of the secondary concrete pouring compacting expansion. Finally, we need to check the verticality of the main steel structure and the whole plane bending
Fourth, the preparation before lifting.
When the manufacture of steel columns in the column axis design draw feet, on top of the cover shells on cross control lines, control and vertical axis of bolt installation quality control for lifting. Bolted steel construction for general use bolts and high-strength bolts. Ordinary bolts, each bolt end can not be more than two pads gaskets, not use gas cutting reamer bolt holes, bolts tightened after the exposed thread pitch of not less than 2; key control for high-strength bolts bolted rubbing treatment (sandblasted) , anti-slip surface friction coefficient, tightening sequences applied bolting, screwing early final twist, twist applied torque value, the value of the exposed threaded bolt, the gusset plate surface damage and deformation. Installation plate contact surfaces should be smooth, the contact surface must be greater than 75%, the edge of the gap is not greater than 0.8 mm, high-strength bolts should be free to penetrate not be beat and reaming; high-strength bolts shall not be used as a temporary installation bolt, bolt should one direction, bolt mounting every day should be a final twist is completed, a final twist after completion should be individually checked for less twist, super twist should be screwed up or replaced.
Steel Works important quality control points
Embedded quality embedded anchor bolts, anchor bolts directly affect the quality of the installation of steel structures, control bolt (group) position, squareness, length and elevation, and the reaming adjustment to reduce workload (even avoid rework), improve the structural quality of the installation is important. The method can be directly embedded anchor bolts embedded method may also be set aside hole method.
Fifth, the steel works rainy winter construction measures
(A) Construction in Winter
1. Winter construction steel structure fabrication and installation of steel strictly enforced in accordance with the relevant provisions of Winter Construction.
2. The steel components making positive temperature negative temperature installation should be considered when members shrinkage based on differences in ambient temperature, and adjust the deviation to take technical measures in construction.
3. Participation negative temperature steel construction welders should be subject to a negative temperature welding technology training, examination, and obtain the corresponding certificate.
4. The connecting material steel and related negative temperature used be accompanied by a certificate of quality, performance and product standards meet the design requirements.
5. The negative electrode for use at a temperature more than two hours can not be exposed, more than two hours to re-baking electrode baking times no more than 3 times.
6. flux prior to use in accordance with regulations baked to a moisture content of not more than 0.1%.
7. The negative temperature high-strength bolts used shall have a product certificate, and at negative temperature coefficient of torque, axial force re-inspection.
8. The negative temperature steel structure used coatings not use water-based paints.
9. The next member feed, should be reserved for the shrinking margin, welding shrinkage and compressive deformation amount should be coordinated with the shrinkage of steel produced in the negative temperatures.
10. member assembly, according to the order prescribed in the process from the inside out extended group fight, do weld shrinkage experimentally determined values need to be reserved at the time of negative temperature group fight.
11. component assembly, remove the seam 50mm memory remain rust, burrs, dirt, oil, snow and other debris, dry and free of residual moisture holding seams.
12. The negative temperature should be at least 9mm steel plate welded to the multi-layer welding, weld surfacing from the bottom up layer by layer, each weld once finished welding, such as welding interruption before applying again to clear welding welding defects. Arc welding is prohibited on the base material.
13. Steel-site installation, in case of snow or wind speed 6m / s or more, the erection of protective shed.
14. eradicate substandard weld re-welding, steel welding process in accordance with the provisions under the negative temperature welding.
15. When the ambient temperature is below 0 ℃, before brushing anticorrosive paint brushing process test, component surface rust, oil, burrs and other things necessary to clean up brushing clean, and keep the surface dry. Snow or ice may not work on brushing member.
16. Winter transport, steel anti-slip measures taken when stacking, stacking space formation member firm no puddles, no freezing ground. When the same type of members are stacked, members should be kept level, horn on the same vertical line, and prevent slippery member.
17. Installation according to claim former steel negative temperature conditions, their quality retest of the production and transportation of missed stacking member deformed, repair correction on the ground.
18. Hoisting ropes should use anti-skid steel members plus septum, and at the same time lifting the gusset plate member, installers need to use the fixtures and other things with a rope lashing firmly.
19. Preparation of steel components installation sequence chart according to the temperature conditions, in strict accordance with the provisions of the order will be installed during construction.
20. Preparation installation of steel structures welding process, both ends of a member shall simultaneously be welded.
twenty one. Before installing remove member surface ice, snow, dew, but not damage the coating.
twenty two. Negative temperature installation of pillars, main beam immediately corrected permanently fixed position correction right now, the day of installation space member to form a stable system.
23. The high strength bolt friction joint fitting member may not have snow ice surface, no contact with dirt, oil and other stolen goods.
24. The negative temperature steel installation quality addition to complying with "Steel construction and acceptance norms" (GB50250-95) requirements, but also according to the design requirements for inspection and acceptance.
(B) the rainy season construction measures
1. Rain construction, erection of temporary protection should be shed, rain may not fall on a hot weld. The welding site is wet, wipe with a dry cloth and must be in before the welding with oxy-acetylene flame to dry, keeping the seams dry, no residual moisture.
2. When lifting, the member if water should be cleaned before installation, but not damage the coating, high-strength bolts when fitting installation member friction surface should be clean, can not have drops, not rain and exposure to dirt and oil and other dirt.
3. member rainy weather can not be brushing work.
4. The rain and wind can not be more than five roof insulation construction.
5. Because of the rain the air is moist, the electrode should be moisture storage and baked, repeat the same electrode baking times should not exceed twice by management in a timely manner grilled record.
6. The case of windy weather, columns, beams, and other large supporting member should be corrected immediately, permanently fixed immediately after the position correction is correct, to prevent unilateral instability that day installation member, should form steric stabilization system.
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