1、 Scope of application

    It is mainly applicable to the installation construction method and quality standard of ordinary bolts, torsional shear type high-strength bolts, large hexagon head high-strength bolts, rivets, self tapping screws, pull rivets, shooting nails, anchor bolts, anchor bolts and other fastener standard parts in steel structure installation;

    The fastener installation construction of steel structure frame in other fields and uses can also be referred to.

2、 Construction requirements

    Before installation and construction, the main construction equipment and machines and tools shall be prepared; the prefabrication and assembly inspection of all parts and components shall be completed; before installation, the construction site and discharge material site shall be prepared, and the construction conditions shall be met;

    All the personnel who refer to the construction have participated in the construction technical disclosure, and have defined the construction procedures, construction methods, installation procedures, quality standards, finished product protection and HSE technical requirements 

    The construction team leader and post leader shall be familiar with the construction drawings, standard atlas, construction and acceptance standards and specifications;

    The variety, specification, performance, etc. of the delivered goods shall conform to the current national product standards and design requirements, with product quality documents.The inspection report of torque coefficient and tightening axial force (pre tension) shall be attached to the box for high strength large hexagon head bolt connection pair and torsion shear type high strength bolt connection pair when they leave the factory;

    1）The high-strength bolt connection pair shall be supplied as per the package, and the batch number, specification, quantity and production date shall be indicated on the package.The appearance surface of bolts, nuts and washers shall be coated with oil to protect them from rust, dirt and thread damage;

    2）When ordinary bolts are used as permanent connecting bolts, when there are design requirements or doubts about their quality, the minimum tensile load of bolts shall be rechecked, and 8 bolts of each specification shall be sampled;

    3）The torque coefficient of high-strength large hexagon head bolt connection pairs shall be rechecked and inspection report shall be issued. 8 sets of connection pairs shall be selected from each batch for recheck. After recheck, the average value of torque coefficient of 8 sets of connection pairs in each group shall be 0.110-0.150, and the standard deviation shall be less than or equal to 0.010;

    4）The pre tension re inspection shall be conducted for the connection pairs of torsional shear high strength bolts and the inspection report shall be issued. Eight sets of connection pairs shall be selected from each batch for re inspection. The average value and standard deviation of pre tension shall meet the requirements in the following table:

    5）For the steel grid structure with bolt ball joint whose safety level is grade I and span is 40m and above, surface hardness test shall be conducted for high-strength bolts, and 8 bolts shall be selected according to the specification.The hardness of grade 8.8 high-strength bolt shall be hrc21-29; the hardness of grade 10.9 high-strength bolt shall be hrc32-36, and there shall be no crack or damage.

    6）During transportation and storage, the high strength bolt connection pair must be loaded and unloaded lightly, and the thread shall not be damaged;

    7）High strength bolt connection pairs shall be classified and kept according to the batch number and specification on the packing box. It is forbidden to open the box arbitrarily before use to prevent contamination with stolen goods;

    8）The high-strength bolts shall be collected according to the required quantity on the same day. The storehouse shall register the receiver, receiving specification, receiving quantity and using position. The remaining bolts shall be kept properly and shall not be thrown or placed randomly