The construction scheme is determined according to the project. Some projects are simple, and the construction period is short, so there is no need to make complicated schemes. The following is a template:
References:
Construction scheme of a steel structure
The first chapter is the purpose and basis of compiling. Purpose of compilation: The purpose of compiling this construction organization design is to provide a relatively complete programmatic technical document for the bidding stage of light steel roofing project of * * * workshop. Once our company wins the bid, we will deepen on this basis, guide the construction and management of the project, and ensure that the construction tasks of the project are completed with high quality, high efficiency, safety and civilization. 2. Compilation basis: 1, bidding documents, construction drawings and other materials. 2, * * city about civilized construction specifications and standards of construction engineering installation. 3. * * Construction node atlas of Jianming Steel Structure Co., Ltd., ISO900 1 quality assurance system standard documents, quality manuals and other technical guidance documents, as well as the existing construction experience and technical strength of similar projects. 4. According to the current relevant standards and specifications in China: (1) Code for Acceptance of Construction Quality of Steel Structures (GB50205-200 1) (2) Code for Welding of Building Steel Structures (JGJ8 1-9 1) (3) High Strength of Steel Structures. Code for construction and acceptance (JGJ82-9 1) (4) technical specification for steel structure fabrication (DBJ08-2 16-95) (5) technical specification for cold-formed thin-walled steel structure (GBJ 18-87) (6) design and construction specification for profiled sheet metal. 438+06-87) (8) Code for Design and Construction of Steel-concrete Composite Floor Structure (YB9238-92) (9) Technical Code for Steel Structure of Light-duty Houses with Portal Frames (CECS102: 98) .../P >
Core content:
(1) section steel and steel plate 1. Material procurement: The company mainly purchases products from Shougang, Angang, Hangang and Baosteel, and selects qualified suppliers according to ISO900 1 2. Inspection and warehousing: carefully check whether the quality certificate, material, size and specification, and furnace batch number mark are in line with the real thing according to the receipt document, bill of materials and other materials, and store them in a special warehouse according to the furnace batch number mark to avoid confusion with other products. When there is doubt about the quality of steel, sampling inspection should be carried out according to the current relevant regulations of the state. 3. Re-inspection of materials: A, Q235 and Q345 shall be re-inspected according to Q/VVTB 14-89 Technical Requirements for Thick Steel Plate for Welding Structure. Chemical composition requirements: the contents of carbon, silicon, manganese, phosphorus, sulfur and other elements ... Mechanical composition requirements: σs, σb, δs(%), AKU(J), Aku (j \ cm2) and 0Cakv(J). Test sampling shall be carried out in accordance with GB2975-84 "Sampling method for mechanical and technological properties of steel and chemical differences of finished products". The analysis of chemical composition should be carried out according to GB222-84 "Trial sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products". The tensile test shall be conducted in accordance with GB228-87 "Metal Tensile Test Method". Bending test shall be conducted in accordance with GB232-88 "Metal Bending Test Method". The impact test shall be conducted in accordance with GB4 159-84 "Method of Charpy Impact Test for Metals at Low Temperature". B, Q235, Q345 and Z25 shall be implemented according to GB53 15-85 Performance Steel Plate in Thickness Direction. The inspection (UT) method shall conform to JB4730-94 Ultrasonic Inspection Method for Metal Plate C. After the steel plate is re-inspected, the re-inspection mark must be made. In order to achieve traceability, the mark must be transferred. (II) Selection of welding materials 1 and selection of welding material manufacturers shall be determined according to the supplier regulations of ISO900 1 series and the quality certification system of ISO900 1. 2. Selection of welding materials According to the component materials provided in the design drawings, the competent engineer will select the matching welding materials, and the first batch of welding materials will be reinspected and evaluated according to the national standards. After being qualified, the reinspection report and evaluation results shall be submitted to the supervisor for approval before use. 3. Management of welding materials A. Welding materials must have complete quality certificates and complete packaging when entering the factory; B, welding materials warehousing reinspection results consistent with national standards, the manufacturer's quality certificate, can according to the "material management procedures" warehousing; C, welding material storage and welding material warehouse settings should be equipped with complete ventilation and drying facilities according to the specification, and set up warehousing inspection and keeper. The welding material warehouse shall strictly abide by the company's welding material management regulations and perform the outbound procedures. (III) Manufacturing process 1, steel derusting Steel should be shot blasted for derusting, so that the surface is free of rust, oil stain and dirt. Primer shall be applied in time after rust removal, and the friction surface of high-strength bolts shall not be painted. Various configuration files have also been derusted. Anticorrosion in time after rust removal. Steel can also be shot peened and derusted after assembly and welding. 2. Marking and cutting a) The main girder shall be made in sections. B) For long members, manual marking and automatic cutting machine are adopted. Angle steel is cut by combined blanking machine. C) For parts with various shapes, such as rib plates and joint plates, CNC cutting machines are used for cutting and blanking. D) Before cutting all kinds of cutting parts, the material line should not be audited, and cutting and blanking can be carried out only after it is qualified. 3. The bolt holes of the connecting plate and the node plate are processed by a tire drilling machine, and the center line of the connecting plate is drawn as the drilling positioning benchmark and the girder assembly benchmark. 4.H-beam assembly, welding and correction welding H-beam is assembled on the assembly machine, welded on the gantry welding machine and corrected on the flange straightening machine. The welding wire is HO8A or H08Mn2Si, and the flux is HJ43 1. 5. Truss assembly a) Before truss assembly, check the size, shape and shrinkage of each piece, and clean the weld area with grinding wheel after it is qualified. The cleaning range is four times the width of the weld. B) After marking the component position line on the steel platform, make the base coat and assemble according to the line. Manual arc welding is used for tack welding. Welders should have work permits. C) The assembly of the joint plate and the connecting plate shall ensure that the datum line is aligned with the center of the beam, and the assembly shall be carried out by experienced workers to ensure accuracy. 6, truss welding truss assembly qualified, with CO2 gas shielded welding welding. Before welding, the assembly should be kept horizontal to prevent thermal deformation. The welding sequence is that the two welding machines are symmetrical, in the same direction and with the same specification, or the welding sequence is 1, 2, 3 and 4. Its specification is based on the parameters determined by process test. 7. Truss deformation correction and stress relief after welding. If the truss is out of tolerance, it should be corrected by flame method and treated by flame stress relief. 8. CO2 gas shielded welding is used for welding and orthopedic welding. The welding wire is HO8Mn2SiA with a diameter of1.2mm. The welding sequence is that both sides are in the same direction at the same time, and the welding specifications are consistent. After welding, oxyacetylene flame is used to correct welding deformation and flame is used to eliminate stress. Then check all indicators according to the requirements of inspection records. When manual arc welding is used, the welding current should be moderate. 9. According to the design requirements, paint the mark with primer and topcoat, and then paint the mark number again at the designated position at the left end of the main girder with casing, and the mark color is white. At the same time, bolt the component marking iron plate on the bolt hole of the beam end plate, and transport it to the site according to the production plan after passing the test. (4) Process control 1. The selected welding materials shall have the manufacturer's quality certificate, and shall be inspected or reinspected in strict accordance with the standard requirements (or technical requirements) to ensure the use of qualified and high-quality welding materials. 2. Feeding: The materials shall be rechecked after entering the factory. If it is qualified, it should be marked with "△", indicating that it is a special material for this project. Pretreatment of materials according to process requirements. 3. Blanking: After marking, check whether the length, width and diagonal dimensions are correct, and then cut. After cutting, check the groove angle, surface quality and roughness of the cutting surface, and then measure the length, width and diagonal dimension. Draw hole lines first, and then check the hole spacing. After drilling, measure the hole spacing and hole size to ensure that the shape size and position size are within the allowable deviation range of design. See surfaces 4. 1 and 4.2. Table 4. 1 Allowable deviation of materials (mm) Allowable deviation of parts' overall dimensions 1.0 Hole spacing 0.5 Table 4.2 Allowable deviation of parts' width and length (mm) 3.0 Planarity of cutting surface 0.05t and not more than 2.0 Cutting depth 0.2 Local notch depth 1.0 4. Correcting and shaping the corrected steel products after correction. Table 4.3 Legend of allowable deviation of steel after correction (mm) Local flatness of steel plate T ≤141.5t > 142.0 steel bending rise l/ 10005.0 continued table 4.3 verticality of angle steel limb b/ 100 the angle of angle steel connected by double limb bolts is not more than 90 degrees. Verticality of I-beam flange to web b/80 and verticality of I-beam flange to web b/ 1002.0 Bending parts shall be inspected with arc formwork. When the chord length of the part is less than or equal to 1500(mm), the chord length of the sample should not be less than 2/3 of the chord length of the part; When the chord length of the part is not greater than 1500(mm), the chord length of the sample should not be less than 150(mm). The gap between the molded part and the template shall not be greater than 2(mm). 5. Assembly: Before assembly, check the cleanliness of rust and dirt around the weld bead. After assembly, check the assembly shape and size, and the allowable deviation shall meet the requirements in Table 4.4. Welding can only be carried out after inspection. Table 4.4 Allowable Deviation of Welding Connection Assembly (mm) Legend of Allowable Deviation of Project Butt Misalignment (△)t/ 10 and Small 3.0 Gap 1.0 Lap Length (A) 5.0 Gap (△) 1.5 Height 2.0 Verticality (△) b//kloc-0 Whether the welder holds the corresponding welding qualification certificate and whether the holder operates within the validity period; (2) Oil stain and rust on welding materials should be removed before welding. Welding materials with drying requirements must be dried according to the requirements of the manual, and the dried welding materials should be put into the heat preservation cylinder and taken as needed; (3) Both ends of butt joint, T-joint and fillet weld have arc striking plates and lead-out plates, and confirm whether their materials and groove forms are the same as those of weldments. After welding, the arc striking plate should be cut off and trimmed smoothly; (4) When welding, the welding process shall be strictly observed, and arc striking shall not be carried out on the base material. (5) When cracks appear in the weld, the reasons should be found out and the repair scheme should be formulated before treatment. (7) Non-destructive testing: Non-destructive testing shall be carried out according to the welding form, technology and requirements specified in Table 4.5, and the non-destructive testing method shall be carried out according to GB 1 1345-89 Manual Ultrasonic Testing Method for Steel Welds and Classification of Test Results. When there are over-standard defects in the local flaw detection weld, the flaw detection length should be increased at the extension of the flaw detection part, and the increased length should not be less than 10 times of the weld length and not less than 200mm；; When there are still impermissible defects, 100% inspection shall be conducted on the weld. (8) Final dimension inspection: according to the requirements of type inspection technology and relevant standards, the overall dimensions of steel members are inspected and the inspection record sheet is filled in. Allowable deviation of external dimensions of attached steel members. (V) Control of quality documents According to GB50205-95 Code for Construction and Acceptance of Steel Structure Engineering, do a good job in compiling, filling in and collecting quality documents. According to the quality record control procedure, the quality documents are complete, the data are true and reliable, and submitted to the factory supervisor and manufacturing supervisor for review in time. Do a good job of filing and managing quality records according to Product Quality Document Control Procedure, and timely sort out and submit the factory documents of products. (VI) Providing documents The following documents shall be submitted when the steel members leave the factory: ① Certificate of conformity; (2) Construction drawings and design change documents, and the contents of design changes shall be indicated in the corresponding parts of the construction drawings. (3) agreement documents for dealing with technical problems in production; ④ Quality certificate or inspection report of steel connecting materials and coating materials; ⑤ Welding procedure qualification report; ⑥ Test report of friction and anti-sliding coefficient of high-strength bolts, nondestructive inspection report of welds and coating inspection report; ⑦ Inspection records and acceptance records of main components; 8 Pre-assembly record; Pet-name ruby component shipping and packaging list.