Construction method of single-pipe grouting bottom-expanding cast-in-place pile

Abstract

The invention relates to a construction method of a single-pipe grouting bottom-expanding cast-in-place pile, and belongs to the field of cast-in-place piles. The construction method comprises the following steps that 1, a spiral pile machine is used for drilling a foundation to form a pile hole, meanwhile, wall protection slurry is poured, after a drill bit reaches a preset position, a drill rodis lifted, the bottom of the pile hole is expanded, and a pile bottom expanding part is formed; 2, the pile hole is cleaned; 3, a reinforcement cage is placed into the pile hole, and the bottom of thereinforcement cage is inserted into the pile bottom expanding part; 4, a first guide mechanism and a second guide mechanism are installed at the position, close to the pile hole, of the ground and the top of the reinforcement cage correspondingly, and a pouring guide pipe is inserted into the pile hole through the first guide mechanism and the second guide mechanism; and 5, a concrete pump is connected to the top of the pouring guide pipe, and pile forming concrete slurry is poured into the pouring guide pipe. The construction method has the effect of keeping the pouring guide pipe stable when being put down.

Description

technical field [0001] The application relates to the field of cast-in-situ piles, in particular to a construction method of single-pipe grouting and bottom-expanding cast-in-place piles. Background technique [0002] With the rapid development of society, the number of construction projects is also increasing. In order to ensure the stability of buildings, people generally increase the bearing capacity of the foundation by driving piles. Cast-in-place piles are one of the pile-driving methods; , made by pouring concrete or reinforced concrete in the hole. [0003] The construction steps of cast-in-situ piles generally include leveling the site, preparing mud, installing and positioning the drilling rig, drilling into holes, clearing the holes and checking the quality of the holes, lowering the reinforcement cage and pouring underwater concrete. Usually, the bottom of the hole is enlarged with a bottom reaming drill bit after drilling into the hole forming step. In addition...

AI Technical Summary

Problems solved by technology

[0004] Before pouring underwater concrete, it is generally necessary to lower the pouring conduit used for pouring concrete to the bottom of the hole. During the lowering process of the pouring conduit, since the pouring conduit is usually lowered by a crane, it is greatly affected by the wind, and it is in the mud. In the presence of the grouting conduit, it is easy to shift, causing the grouting conduit to collide with the reinforcement cage, affecting the stability of the reinforcement cage, and thus affecting the construction of the cast-in-situ pile

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