High strength steel should be studied in steel structure to greatly improve its yield point strength; In addition, new steel products such as H-beam (also known as wide flange steel), T-beam and profiled steel plate should be rolled to meet the needs of long-span structures and super high-rise buildings. Next, I will share with you the construction scheme flow of the steel structure corridor. Welcome to read and browse.
Comprehensive description and general situation of steel structure corridor construction technology 1
The indoor cantilever steel corridor is located in the boiler room of Huaneng Nong 'an Biothermal Power Plant. In order to facilitate the opening and closing of windows, the east and west cantilever steel corridor passages are added. The length of the corridor is about 35.00 meters, the cantilever width is 0.9 meters, the elevation of the corridor bottom is 2 1.00 meters, and the corridor construction area is about 63.00㎡ (see attached figure). The safety grade of the steel corridor is Grade II, and the fire resistance grade is high. The original fixed glass windows at the elevation of 2 1.8m on the west side and 2 1.8m and 18.8m on the east side of the boiler room were removed and replaced with 90 series plastic steel belt yarn sliding windows (see 07J604 standard atlas for practices). The area of plastic-steel window with yarn is about129.6m2. ..
Construction preparation work
1, organize relevant project management and technical personnel to jointly review drawings. If the drawings are unclear and the construction is difficult, the verification procedures for changes shall be handled.
2, according to the construction drawings combined with the equipment and technical conditions of this unit, work out the construction scheme of this project, and put forward the material plan.
3. Check the performance of machinery and testing equipment used in steel structure and plastic window engineering to ensure that all kinds of equipment are in good working condition and fully functional during construction.
4, steel structure, plastic-steel window engineering materials in addition to the quality certificate, should also be in accordance with the provisions of the current national standards for a second interview inspection, qualified rear can use.
5. Before the construction of steel structure and plastic-steel window project, the construction personnel in each process should be provided with necessary job training and technical, quality and safety disclosure to prevent safety and quality accidents.
6. Steel structure plastic-steel windows should be inspected after entering the site, and stacked reasonably, so as to facilitate the smooth installation of components after entering the site.
Construction schedule arrangement
According to the situation of Huaneng Nong 'an Biothermal Power Plant and the actual difficulty of the project. Specific arrangements and node schedule control are as follows:
2 days of construction preparation-5 days of material procurement and production in the processing plant-2 days of on-site scaffold erection-5 days of on-site assembly and welding in the corridor-6 days of production and installation of plastic steel windows in the corridor, and 20 days of delivery.
Labor force plan
According to the actual situation of this project, the on-site labor force will be deployed in time, and it will be fully equipped according to the type of work, level and project content. The master plan will dispatch all types of labor as follows:
There are 4 blanking workers, 4 assemblers, 2 welders, 3 scaffolders, 2 painters and 4 door and window installers.
Preparation of main construction machinery
Large machines and tools such as drilling machine, steel bar automatic combination machine and band saw are all equipped and used in the processing plant.
The site is equipped with 1 arc welder, a set of oxygen welding and cutting equipment and a 25-ton crane. Rocker drill, hand electric drill, grinding wheel cutting machine.
Fabrication, installation and construction method of steel structure corridor
1, fabrication of steel structure corridor:
1, the steel selected for this structure must have the factory certificate and original data, and the steel entering the site can only be used after passing the second interview.
2. Choose processing equipment with good performance and full functions.
3. covered electrode should have the factory certificate or material report, and covered electrode should be dried in a drying oven before use. The welding wire and flux used in submerged arc welding must match the parent metal used.
4. After the fabrication of steel members is completed, it is necessary to carry out shot blasting and derusting, and it is required to apply primer within 24 hours after derusting. When spraying primer, it is required to ensure that the film thickness of the paint meets the design requirements.
5. All operators must operate in strict accordance with the technical, quality and safety disclosure contents, and welding personnel must hold relevant certificates.
6. The butt weld of this steel structure needs ultrasonic flaw detection, and the detection level is Grade II.
7. In order to improve the accuracy of hole-making, the steel structure adopts drilling die to make holes. The drill bit shall be made of medium carbon steel and quenched. The diameter of the inner hole of the drill bit should be 0.3 mm larger than the designed hole diameter, and the thickness of the drill bit should not be too large, generally about 15 mm. ..
8. In order to ensure the production accuracy, the shrinkage of steel members should be preloaded when blanking. The preload depends on the size of the workpiece. Generally, the workpiece is 40-60mm, and important large and long workpieces should be pre-installed with 80-100 mm.
9. It is very important to make a reasonable welding sequence. When several kinds of welds are to be welded, the transverse seam with large shrinkage deformation should be welded first, then the longitudinal seam, or the butt weld should be welded first, then the fillet weld.
10, the main weld of welded steel shall be welded before assembling the stiffening rib parts. The welding sequence of main welds shall be staggered according to the requirements of post-weld deformation.
2. Installation of steel structure corridor:
1, steel structure hoisting process should strictly implement GB50205-95 Code for Construction and Acceptance of Steel Structures and GB5022 1-95 Standard for Quality Inspection and Evaluation of Steel Structure Engineering.
2. Before construction, the longitudinal, transverse and horizontal elevations, overall dimensions and welding quality of steel members must be rechecked, and the construction can only be started if they are qualified.
3. Technical disclosure must be made before construction.
4. During the construction period, full-time personnel must hold the qualification certificate issued by the Labor Bureau.
5, measuring instruments must pass the metrological verification for qualified instruments before use.
6, adhere to the three inspection (self-inspection, mutual inspection, professional inspection) system in the construction, strict process quality inspection.
Method for manufacturing, installing and constructing plastic steel doors and windows
1. Profile blanking: Considering the welding allowance, the length needs to be increased by 6mm. The length error is 5 mm, and the angle error is 5.
2. Milling drainage holes and air pressure balance holes: No matter the sliding window, the inner window or the outer window, drainage holes and air pressure balance holes should be opened. Drainage holes and air pressure balance holes should not be opened at will, but should be opened according to the requirements of specifications. The size of the drainage hole is φ× L (5 mm× 30 mm); The size of the air pressure balance hole is φ× L (4.5 4.5mm× 30mm).
3, milling hardware installation slot.
4. Strengthen the cutting and assembly of section steel: function: improve the rigidity and strength of doors and windows, and prevent the deformation of profiles; Make the installed hardware more firm. Technical requirements: the wall thickness shall be ≥ 1.2mm, and the fit clearance shall be1.5mm. The internal and external surfaces of steel bars shall be smooth, and there shall be no cracks, delamination and lap welding defects. Smooth appearance, clear edges and corners, no burr. Cutting and assembling of reinforced section steel: installation principle;
A, it is determined by calculation,
B. Frames, fans and stiles with hardware to be installed;
C, when the length of the main profile is greater than 450 mm .. The distance between the reinforced steel and the end of the profile should not be greater than15 mm; There shall be no less than three connecting fasteners for fixing each steel bar, with a spacing of ≤300mm and a distance of ≤ 100mm from the end of the steel bar. Fixed reinforcement shall not be loose.
5. Profile welding: mainly control welding temperature, clamping pressure, melting pressure, butt pressure, melting time and butt time.
6. Flash cleaning.
7. Sealing strip installation: there are O-type and K-type sealing strips, O-type is used for sealing between frames and fans, and K-type is used for sealing between glass and battens; The end of the sealing strip in each frame should be located in the middle of the upper frame, and the sealing strip at each corner should be cut with scissors to make the sealing strip straight at right angles. Cutting the sealing strip is strictly prohibited. Rubber strip should be smooth, without curl and grooves.
8. Selection and installation of hardware fittings: Whether the switches of doors and windows are tight and flexible depends on the quality of hardware installation, especially the installation of handles, locking points and sliding supports. Stainless steel sliding supports must be connected with stainless steel screws.
9. Glass assembly: It is recommended to grind the glass to prevent it from being broken during manufacture, transportation and use. The ambient temperature for glass installation should be higher than 15C. Glass installation must add glass pad, glass shall not be in direct contact with the frame and fan; The blanking length of glass beads should be accurate, and the fillet joint should be ≤1mm.
10. Installation of window frames: the position of the fixed points of window frames is a = 150 ~ 200mm, which is away from the corner of doors and windows, the middle mullion and the middle transverse frame, and the distance between the fixed points is l≤600mm. Fixtures (expansion bolts) shall not be directly installed at the ends of intermediate transverse frames or intermediate vertical frames. There should be a gap of 10mm between the window frame and the attached frame, and the gap between the window frame and the attached frame should be tightly sealed with styrofoam to ensure the thermal insulation performance of the plastic-steel window, and it can freely expand and contract when the temperature changes. When fixing the lower frame, the fixing parts should be installed as far as possible to reduce the risk of water leakage.
1 1. Inject styrofoam and sealant: the gap between the window frame and the hole must be sealed with polyurethane styrofoam, and the styrofoam should be filled evenly and densely; Before construction, the outside of the gap should be blocked with baffles, and styrofoam should be used inside. 10 ~ 15 minutes later, the spilled foam should be flattened and pressed into the frame, and it is not allowed to be cut with a knife. After the temporary fixed wooden wedge is removed, it should also be tightened with styrofoam. The sealant should be injected by experienced personnel, and it should be smooth and flat.
Safety construction measures
1, the construction site shall be provided with a safety foreman to implement and manage the on-site safety measures, and conduct unified management on the on-site construction personnel, on-site mechanical equipment and on-site electricity consumption. Secret service operators involved in the construction must be trained and certified. Conduct safety technical disclosure to all construction personnel before construction. Personnel entering the construction site must wear safety helmets and non-slip shoes, electricians and welders must wear insulating shoes, and safety belts must be fastened for aerial work.
2. Before operation, the tools, machines and equipment used shall be inspected, and the safety devices shall be complete and effective.
3. The operating surface shall be provided with reliable insulating supports, and the operation can be carried out only after passing the inspection. The binding method of components is correct, the lifting point should have anti-skid measures, and the tools and materials used for aerial work should be placed in a safe place, and it is strictly forbidden to place them casually.
4. When lifting steel members, the lifting or lowering should be smooth to avoid emergency braking or impact. Command by special personnel, and the signal is clear and loud. Illegal operation is strictly prohibited. Be sure to check the quality of the components after installation, and unscrew them only after they are safe and reliable. You must get to a safe place before work every day.
5, mechanical and electrical equipment, brake box, welding machine on the construction site, should have reliable rainproof measures. Electrical operation must be carried out by professionals, and non-professionals are strictly prohibited. Electric welding machine shall be used in strict accordance with the safety operation regulations, the primary line shall not exceed 2m, and the secondary line shall not be exposed.
6. Safety facilities shall be uniformly set by special personnel according to regulations, and others shall not dismantle them at will. If it is necessary to dismantle it due to work needs, it must be allowed by the relevant personnel, and it should be restored in time afterwards. The security officer should check it carefully.
7, to do a good job of safe use of electricity, all the electrical equipment removal and site lighting by professional electrician, the electric tools used must be equipped with leakage protector.
8, concentrate on aerial work, it is forbidden to drink and play during work, hand-held tools should fasten the safety lanyard, avoid vertical cross operation.
9, do a good job of fire prevention, operation should be used correctly in accordance with the provisions.
10, roof installation, safety net should be arranged and crossbar should be set.
1 1, adhere to the system of pre-shift safety meeting, and disclose the work arrangement and safety precautions of the day.
12. Conduct regular safety inspections to prevent and control unsafe factors of accidents.
13, the hoisting command should be decisive and the instructions should be concise and clear.
14. Strengthen site security and pay attention to fire prevention and theft prevention.
15. A security cordon should be set up within the scope of hoisting operation, and non-operating personnel are prohibited from entering.
16, all safety activity records and documents shall be complete.
On-site civilized construction measures
1, the industry requires all information and accounting (construction plan, safety education, safety disclosure, safety inspection, electrician's day patrol record, pre-shift speech record, accounting) to be complete and tidy, practical and realistic, hold relevant certificates for special operations, and have a clear division of safety responsibilities.
2. Wear a safety helmet when entering the site, wear a safety belt when working high above the ground, support a safety net according to regulations, have a protective shed at the entrance and exit, and have a safe passage in a narrow space.
3. Electrical equipment (main brake box, distribution box, switch box, electric shock protector in distribution box and switch box) shall be provided with three-level control and two-level protection. The brake box should be standardized, the line should be standardized, and the electrician's patrol and roll record should be recorded.
4, this project set up color fence, civilized construction management on site. There are obvious propaganda slogans at the scene, and color codes that meet the standards are hung at dangerous places.
5. There is a flat and clean channel at the site, without blockage and water accumulation, and the construction wastewater is reasonably discharged into the drainage ditch.
6, civilized construction is not a nuisance, strictly control the construction noise, stop construction after 10.
7, inside and outside the site do not illegally occupy the road, do not illegally stack things, do not cause fire, traffic accidents, do not illegally damage public facilities, do not pollute the environment, and cooperate with relevant departments.
Construction technology of lattice column
Operation process:
1, lattice column lofting and marking: lattice column shall be constructed according to design requirements. Clean up the raw materials before cutting, and reserve appropriate welding shrinkage allowance and cutting allowance to save materials as much as possible.
2. Assembly and welding of lattice columns: If the lattice columns are long and inconvenient to transport, they should be assembled and welded in sections. Ensure the verticality of lattice columns.
3. Hoisting, transportation and stacking of lattice columns: Steel lattice columns are hoisted by cranes and slowly.
4. Installation and positioning of lattice column: After the lattice column is hoisted into the pile hole, it should be welded firmly with the reinforcing cage. The main reinforcement of reinforcing cage should be welded with lattice column reliably and firmly, and the lap length should meet the specification requirements. Welding requirements should be consistent with the requirements of engineering piles and must meet the requirements of specifications.
Quality requirements:
1. raw materials: the angle steel and steel plate of lattice column shall be purchased in strict accordance with the requirements of drawings and specifications, and the factory certificate and test report must be available.
2. Welding requirements: The welding requirements of lattice columns are high, and the weld surface should be uniform and smooth, without wrinkles, discontinuities and incomplete penetration, and the connection with the base metal is soft, without cracks, slag inclusion, flash, burn-through, arc pits, needle-like pores, spatter and other defects.
3. Key points of installation quality: In order to ensure the verticality of the steel column, the verticality of the lattice column should be monitored during installation, the steel column and the reinforcing cage should be connected in a reliable pile-forming process, and the concrete pouring of the column pile should be carried out under the conduit.
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