The elevation of the reinforcement cage and lattice column can be calculated by the elevation at the top of the mouth guard pipe. The design elevation of the pile top must be guaranteed when the placement, and the allowable error is±10mm, lattice column and steel cage must be welded firmly, vertical deviation is not greater than1/300.

When the steel cage is placed, it should be aligned with the center of the hole. Generally, it adopts positive and anti-rotation and gradually sinks to prevent collision. It should be fixed immediately after being placed at the design elevation. When lifting the cage under the steel cage, the cage should be aligned with the hole by manual assistance, keeping it vertical, gently and slowly, and avoiding collision with the hole wall. If there is any obstacle in the process of lowering, it should be stopped immediately and dealt with after finding out the reason. It is strictly prohibited to raise the fierce release and forced entry.

When the steel cage is installed into the hole and the upper and lower sections of the cage or the steel cage and the lattice column for butt welding, the steel cage and the lattice column should be kept in a vertical state, and the butt steel cage should be welded symmetrically on both sides.

After the completion of the steel cage connecting to the hole mouth, the intermediate acceptance shall be carried out, and the installation of the next cage can be carried out after passing the inspection.

When lowering the steel cage and lattice column, technicians should strictly control the top elevation of the cage. The steel cage with lattice column should be super-flat controlled on the top surface of the lattice column and welded firmly with the steel pipe at the wellhead. The steel cage without lattice column should be made of three derrick rods (for derrick rods)∮25Steel processing, the lower part is welded on the main bar of the steel cage, and the upper hook is hung on the steel pipe of the wellhead) to prevent the steel cage from floating under the weight or pouring concrete.

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