2023 second-level construction engineer construction gold test point high-strength bolt , second-level academic master notes, long press and like + forward + evaluation continue to be updated, Wendang version click on my avatar and send a private message to me: 2022
(1) High-strength bolts are usually divided into friction connection, tension connection and pressure-bearing connection according to the connection form, among which friction connection is the most common connection form.
(2) The treatment methods for friction surfaces at high-strength bolt connections are usually: sandblasting (pilling) method, pickling method, grinding wheel grinding method and wire brush manual rust removal method.
(6) High-strength bolt should be installed first. The number of installation bolts and punching nails must be ensured to bear self-weight and external forces. High-strength bolts shall not double as installation bolts.
(7) When installing high-strength bolts, the penetration direction should be consistent. On-site installation of high-strength bolts should be able to penetrate the bolt holes freely and should not be forced into them. When the bolt cannot be penetrated freely, the bolt hole can be trimmed with reamer or file . The bolt hole must not be expanded by gas cutting . The number of holes should be approved by the design unit.
(8) High-strength bolts should be replaced after being super-tightened, and the replaced bolts should not be reused. It is strictly forbidden to use flame or welding to cut high-strength bolt plum heads.
3. The length of high-strength bolts should be based on the exposed 2 to 3 wires after the bolt connection is finalized.
4. The fastening order of ordinary bolts should start from the middle and be symmetrically carried out to both sides.
5. In the same joint, the initial, repeated and final twisting of the high-strength bolt connection pair should be completed within 24 hours. In principle, the order of the primary, repeated and final twisting of the high-strength bolt connection is from the part with greater stiffness to the part with less restraint, from the center of the bolt group to the surroundings.
6. When the design document does not specify the connection nodes used for high-strength bolts and welding, the construction order of the bolts first and then welding should be followed.
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