Control points of supervision in the construction stage of steel structure engineering

(1) Check the warranty, inspection report and on-site sampling retest report of all kinds of raw materials of steel structure engineering. Only qualified materials are allowed to be used in this project. Send technology, experience, management ability strong supervision live production site, because the personnel stationed on the site can not be too much, so the quality of its high requirements.

(2) The steel structure factory should have the production process experience of this type of medium steel structure, otherwise, it should carry out process test and evaluation, analyze design requirements, adopt reliable technology to make sample, and carry out mass production according to this when feasible. Main inspection: surface quality of blanking plate and steel plate, welding process (flux should have warranty, drying record, personnel working certificate, weld height, flaw detection), friction surface treatment, component size inspection, pre-assembled size gap, paint film thickness and coating materials, etc.

(3) the steel structure construction site inspection: the certificate of approval, torque coefficient of high strength bolt, fastening axial force, second-round exam report (torque coefficient and friction surface slip resistance test) component to check (deformation) mainly to check the size, number, and must according to the nature, form a complete set of beam during construction approach, on-site installation quality check points: Check main beam top surface, first to check the torque wrench (electric) calibration certificate, and the friction surface roughness, tighten the second inspection of high strength bolt specification, required to look up to each node, be careful to use semmetry tighten, tighten the principle of final inspection close the gap, for more than 80% of the area is close to. Sampling anti-slip test and weld detection test during installation phase should also be carried out on site.

(4) Control points of the welding seam: Design to reduce as far as the site welding, if necessary, also want to strengthen the control of weld seam quality, that you were not in the fog had first sunny sunshine after more than 1 hour to get to work, need is to use heat blower after dry, electrode to agree with factory welding, for the same batch number, use after drying, thick steel plate welding out a groove in the factory, best level of weld requirements at the factory, After the completion of welding, inspection shall be carried out on weld line by weld line. Control points of wall and roof enclosure structure: First check the purlin, color plate meets the design requirements, pay attention to the thickness and material, manufacturer, and surface coating is in line with the requirements, check the certificate of approval of all materials, then inspect the bite of roof plate form meets the design requirements, and then examine the bedding face during the installation process focus verticality, smoothness, plate flat-fell seam quality, the water side form and waterproof quality and apparent quality. The surface color shall be subject to the confirmed sample. Other auxiliary materials shall control the manufacturer and technical parameters according to the contract and design requirements.

(5) fire retardant coating, anti-corrosion coating control: focus on the control of material sources, inspection reports and site sampling test bonding strength, while supervising the thickness of the construction coating, the number of passes, fire resistance limit is the main data to ensure the use of the function, the site to the classification of all kinds of components thickness, and cooperate with the acceptance of the fire department.

(6) Coordination of construction process: Steel structure, enclosure structure, civil structure is often done by different units, sometimes there is no contractual relationship between each other, this requires supervision (management) units with the landlord for a large amount of coordination and scheduling, will produce a lot of contradictions, especially the time limit for a project coordination, site coordination, material storage, finished product protection, etc., to deal with bad unnecessarily increase will affect the construction period, quality and cost, In particular, it is easy to cause safety accidents, so we should provide assistance and coordination from the contract, management, organization, information and other aspects. It is suggested that the owner designate the general contractor to coordinate on the spot, and the management and the owner to make a good plan and contract management is an ideal model.

(7) Strengthen safety supervision and management, implement the effective operation of safety responsibility system and safety management system, and control safety risks.