Construction method of undercutting of fasteners in steel structure warehouse

A. Suitable for limitations

It must be suitable for standard fasteners such as general bolts, torsion shear-type high-strength bolts, large hexagonal high-strength bolts, rivets, self-tapping screws, pull rivets, shooting screws, anchor bolts, anchor bolts, etc. in steel structure warehouse equipment Installation methods and quality standards. The construction of fastener devices for steel structure warehouses in other areas and uses can also be implemented by reference.

B. Construction request

Before installing and constructing the steel structure warehouse, prepare the finishing work of construction equipment and machinery; prefabricate and inspect all parts. Before installation and construction, prepare the construction site and unloading material park, and provide construction conditions. Satisfy all construction workers are included in the test, construction skills, understanding of construction procedures, construction methods, process equipment, quality standards, product maintenance and HSE skills requirements.

The construction team leader and post leader should be familiar with the construction design drawings and materials, standard atlases, construction and acceptance work standard models. The type, standard and other functions of the goods should be consistent with the current national standards and the requirements of the product planning, and there is a quantity of product grid files. The connection pair between high-strength large hexagon head bolts and torsion-shear type high-strength bolts should be shipped with a certain torque influence coefficient and tightening axial force (pre-tension inspection report).

1. During the construction of the steel structure warehouse, the high-strength bolt connection pair should be supplied according to the packaging box, and the batch number, standard, quantity and production date should be indicated on the packaging box. The appearance of bolts, nuts and washers should be oiled and maintained. They should not be rusted and infected, and should not damage the threads.

2. When a general bolt is used as a permanent connecting bolt, when the plan has a request or its quality is doubtful, some bolts should be re-inspected with very small tensile loads, and 8 of each technical standard and bolt should be checked.

3. A re-inspection report and an inspection report should be issued for the torque coefficient of the high-strength retaining bolt adapter. The 8 sets of adapters are extracted in batches for re-inspection, and the average value of the torsion coefficients of each group of 8 sets of convergence should be 0.110~0.150. , The standard error is less than or equal to 0.010.

4. The torsion shear-type high-strength bolts shall be used for pre-tension re-inspection and related inspection work reports shall be issued. Each batch of data shall extract 8 sets of connection pairs for re-inspection.

5. The safety level is level 1, and the bolt ball joint steel grid layout of the steel grid with a span of 40m. The high-strength bolts should be connected to the appearance hardness test, and 8 randomly checked according to the standard. The hardness of the high-strength bolt with a hardness of 8.8 should be HRC21-29; the hardness of the high-strength bolt with a hardness of 10.9 should be HRC32-36, without cracks or damage.

6. High-strength bolts are used to connect the pair. In the process of transportation and preservation of history, it must be lightly loaded and unloaded without damaging the threads.

7. The high-strength bolt connection pair should be stored according to the batch number and standard classification on the packing box. It is prohibited to open the box randomly before use to prevent infection of stolen goods.

8. High-strength bolts are collected in one quantity that is required on the day. The steel warehouse should register the applicant, the management standard of the applicant, the number of the applicant, and the application location. The remaining part of the bolt should be stored securely and shall not be littered or placed indiscriminately.