The main points of the newly issued "Side Workman's Leg": How to divide the construction quality acceptance of the steel structure project, A: The acceptance of the steel structure construction quality is based on the self-inspection of the construction unit, according to the inspection approval , Sub-L course, sub-branch division process. When the steel structure is used as a taxi for Xi's construction project: the body structure, the f sub-project; the Feng main structure also contains steel bars; when the superstructure, the masonry structure, etc., the steel structure belongs to the F sub-division project; T large-scale steel structure project can also be divided into several sub-divisional projects according to the spatial rigidity unit. Division or sub-divisional projects are composed of several sub-projects; sub-projects are composed of several inspection lots. Question: "Code for Acceptance of Construction Quality of Steel Structure Engineering" (hereinafter referred to as "new code"> which sub-projects are divided into steel structure engineering, A: According to the Wnl of the required work type, materials, construction technology, etc. of the steel structure engineering, the new code Will not be for steel knot welding, fastener connection, steel parts and steel parts processing, steel component assembly, steel component pre-assembly, single) * steel structure installation, multi-layer and layer steel structure installation, steel mesh frame There are 101 sub-items L: Cheng for structural installation, metal forming and steel structure coating. Q: How to divide the inspection lot for the steel structure sub-projects? Answer: The steel structure sub-projects are based on the K principle to create the inspection batch: seam creation; Divided by floor or construction section; divided by roof, wall panel, floor, etc .; in sub-projects, but can be combined or decomposed inspection batches according to the project scale and the actual situation of the incoming materials, for acceptance when entering the site. Q: What are the requirements of the qualified quality of the inspection batch of the steel structure sub-projects? A: The qualified quality of the inspection batch mainly depends on the new specification requirements for the inspection results of IT-controlled projects and general projects. Li meets the following requirements: the requirements of the standard quality standards; if there are no less than 80% of the checkpoints (values) meet the requirements of the quality standards of this standard, and the maximum value should not exceed 1.2 times the allowable deviation. Regarding what is an inspection lot, a unified standard for quality inspection and acceptance of Shigong "Points to Note" article. Q: The new code stipulates which steel materials for steel structure engineering need to be re-inspected. A: The new code stipulates with mandatory provisions: "The varieties, specifications and performance of steel and steel castings should meet the current national product standards and design requirements. The quality of imported steel products should comply with the requirements of the standards specified in the design and contract. "The new specification clearly specifies the following six types of steel. After entering the site, you should witness the sample and send the sample for re-inspection: supply the steel caused by mixed batches; At 40mm, and bear the tensile force along the thickness of the plate; as a first-class, large-span steel structure used in the main load-bearing members (chords, beams, etc.) steel; steel village; materials, including quality certification documents are incomplete or in doubt Steel, and the steel in the quality certificate is less than the design requirements. Q: What are the specifications for the appearance quality of steel surfaces? Answer: The specifications require that the surface appearance quality of steel for steel structures should meet the following requirements: when defects such as pits or scratches, the depth should be greater than the thickness of the steel. The deviation value is 1/2; the grade should be in accordance with the current national standards of grade C and above; there should be no defects such as delamination and slag inclusion. Q: The new specification stipulates which welding materials used in the steel structure need to be re-examined. Answer: Welding materials have a significant impact on the welding quality of the steel structure. Therefore, the new specification stipulates with mandatory provisions: "The variety, specifications and performance of welding materials should be Conforms to current national product standards and design requirements. "And requires that the welding materials used in important steel structures should be witnessed to take samples and send samples for re-inspection. The important steel structure welds referred to here are: Grade 1 and Grade 2 welds; Grade 1 welds; Grade welds; Grade 1 welds in the structure; Seams. Q: What requirements does the standard put forward on the fastening standard parts for steel structure connections? Answer: The standard requires high-strength large hexagon head bolt connection pairs for steel structure connections, torsion-shear type high-strength bolt connection pairs and steel mesh frames. The variety, specifications and performance of various fastening standard parts and standard accessories should meet the current national product standards and design requirements. The torque coefficient of the high-strength large hexagon head bolt connection pair and the tightening axial force (pre-tension) of the torsional shear type high-strength bolt connection pair are the key factors that affect the quality of the high-strength bolt connection, so the specification requires the manufacturer to carry out before leaving the factory Inspection and issue an inspection report, the construction unit shall witness the sampling and send samples for re-inspection in time before use and within the product quality guarantee period. Question: What inspection items are proposed by the new specification on the quality of bolts for steel structures? , A: The new specification proposes the following inspection items on the quality of bolt balls for steel structures: the original materials used for the ball joints, their varieties, specifications, performance, etc. should meet the current national product standards and design requirements; cracks and wrinkles; and tolerances should be It meets the requirements of coarse thread and 6H accuracy in the current national standard. The size and allowable deviation of the angle between the centerlines of two adjacent bolt holes shall comply with the provisions of this code. Q: What requirements does the new code place on welders engaged in welding construction of steel structures? Answer: In the welding of steel structure construction, the operation skills and qualifications of the welders play a role in ensuring the quality of the project. Therefore, the new code states: "Welders must Pass the examination and obtain a certificate of qualification. The certified welder must perform welding within its examination qualifications and its approved scope. "The specification also stipulates:" After welding, the welder shall be stamped with the welder's stamp on the welding seam and parts specified by the process: What are the specifications for the appearance quality of steel structure welds? Answer: The specification requires that the surface of steel structure welds must not have defects such as cracks, weld lumps, etc. The first and second grade welds must not have surface porosity, slag inclusions, arc pits, arc wipe Injury and other defects. And the first-class welds must not have undercuts, under-welds, root shrinkage and other defects. The appearance of the welds is uniform in shape, good in shape, and the transition between the weld bead and the weld bead and the weld bead and the basic metal is smooth , Welding slag and flying objects are basically removed. Question: What are the main control items specified in the new code for high-strength bolt connections of steel structures? Answer: The new code specifies the following main control items for high-strength bolt connections in steel structures: Anti-slip coefficient test and reinspection; after 1h of the final connection of the bolted connection pair, a final torque check should be performed within 48h; after the final connection of the connection pair, the number of bolts that have not unscrewed the torx head in the final pull should not be greater than this node 5% of the screw count,-, Q: What are the requirements for the cutting quality of the steel? A: The specifications have the following requirements for the cutting quality of the steel: the surface should be free of cracks, slag inclusions, delamination and 1mm large edges; Table ls P3 material cutting allowable deviation item Allowable deviation (mm) Gas cutting machine cutting parts width, length cutting plane flatness 0.05 * and should not be Ding -2.0 cut depth depth steel end Note: Q: What are the regulations on the quality of steel structure assembly? , Answer: The specification stipulates the following requirements for the assembly quality of the steel structure: it should not be burned down; the difference should meet the requirements of this specification; the area of ​​more than 75 *% should be close; the allowable deviation of the intersection misalignment should not be greater than 3.Omm. Specification for steel works which the provisions on the operation of construction A: The new specification has the following provisions for the construction and operation of steel structure steel truss structural engineering. (1) When installing the steel structure, it is strictly forbidden to exceed the beam, truss, floor slab and roof slab under T load and snow load. Carrying capacity of platform planking, etc. The positioning axis and elevation of the line, foundation and column on the foundation, the position of the positioning axis of the support of the grid structure, the specifications, position and fastening of the anchor bolt or support anchor should meet the design requirements. The allowable deviation of the exposed length and the I-number length is + 30.0mm, and no negative deviation is allowed. The thread should have good protection, requirements, and the provisions of this specification. Marks such as the centerline and elevation datum points of main components such as steel columns shall be complete. Deformation of steel components caused by transportation, stacking and hoisting and coating peeling off should be corrected and repaired. The point should not be less than 70% of the close-fitting part, and the maximum gap of the edge should not be of class, specification, placement position and orientation, and must meet the design requirements and national standards. Rubber pads and rigid pads or different types of rigid pads are not interchangeable. After the stiffness is unity, the gap between the column bottom and the top surface of the foundation should be refilled with fine stone concrete and grout. All joints of the grid ball joints should be tightly filled with oil putty, and the excess screw holes should be sealed. The inspection shall be carried out after the structure forms the spatial rigidity unit and is connected and fixed, and its allowable deviations shall comply with the provisions of this code. The surface of its cattle and joints should be clean, and there should be no * 9 *, silt suppressing the soul 5. Q: What is the new standard for the coating thickness when coating steel structures? Answer: The new standard is for coating steel structures The layer thickness is specified as follows. The number of coating passes and the thickness of the coating should meet the design requirements. When the design does not require a coating thickness g, the total thickness of the dry coating film: 115Mm outdoor, 1251 indoor, ft cold tolerance -25Pm. The allowable deviation of the thickness of the dry paint film per pass is -5Pm. The thickness of the coating should meet the design requirements related to fire resistance. 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