Commonly used anchor construction and safety technical regulations
Jul 15, 2022| Commonly used anchor construction and safety technical regulations that should be complied with:
Basis: Safety Technical Specification for Lifting and Hoisting in Building Construction JGJ276-2012
1 Vertical anchor should be used in unstable soil conditions, and its structure should comply with the following provisions (Table D.0.1-1~4):
1) Stalls must be set on the lower posterior and central front sides of the sleeper, log, and fir wood ridge columns, and stick to the soil wall, and the pit should be backfilled with soil and stone and compacted, and the surface is slightly higher than the natural floor.
2) The depth of the pit should be greater than 1.5m, and the ridge column should be exposed to the ground by 0.4 to 1m, and slightly inclined backwards.
3) When using sleepers or fir wood as ridge columns, the long side of the cross-section should be consistent with the direction of the force.
4) If the load is large and the bearing capacity of the single-column vertical ground anchor is not enough, one or two single-column vertical ground anchors can be added to the rear side of the force direction, and connected with ropes to make them jointly stressed.
2 Pile type ground anchor should be used in places with high surface water or groundwater level, and its structure should comply with the following provisions (Table D.0.2-1~3):
1) Use a diameter of 180 ~ 330mm pine or shirt wood as a ridge pillar, slightly backwards into the formation, and in front of it 0.4 ~ 0.9m deep from the ground, close to the pile body buried a 1m long stall wood.
2) The pile length should be 1.5~2m. The depth of soil entry should not be less than 1.5m, and the rooting wire rope of the ground anchor should be tied to no more than 300mm from the ground.
3) When the load is large, two or more piles can be connected together with ropes and wooden boards.
3 Horizontal ground anchors should be used in permanent anchors or large lifting operations, and their construction should comply with the following provisions (Table D.0.3):
1) Apply one or several pines (or shirts) bundled together, buried horizontally in the formation, the wire rope should be tied in the middle or both sides of the horizontal wood according to the size of the acting load, and backfilled with earth and stone.
2) The size and quantity of wood should be determined according to the size of the acting load and the bearing capacity of the soil and calculated.
3) The depth of horizontal burial of wood should be 1.5~ 3.5m. When the acting load exceeds 75 kN, the plate should be pressurized on top of the transverse wood; When the acting load exceeds 150 kN, baffle columns and baffles should be added before the transverse wood.
4) When the load of the horizontal anchor is large, the rooting wire rope of the ground anchor should be replaced by a steel tie rod.
4 The rock formation anchor should be used in rocky areas where it is not easy to dig pits and piling, and its structure should comply with the following regulations:
1) The holes with a diameter of 40 mm and a depth of 1.5 m should be punched in the rock layer at the anchor position, and the number of eyes depends on the size of the load, and should not be less than 4 eye holes, and one of the holes should be placed in the tail as a jack for the safety braze.
2) The No. 3 steel braze with a diameter of 32mm and the log with the diameter of 8 to 10 times the diameter of the steel braze should be tied together with a steel wire rope, inserted into the hole, and the cable wind rope should be tied close to the ground.
3) When the acting load is large, the eye depth and diameter should be increased and beaten into the rail.
5 Concrete ground anchors should be used for permanent or heavy ground anchors, and the forced tie rod should be welded to the section steel beam in the concrete.