Method of constructing cast-in-situ piles

Abstract

The invention provides a construction filling pile method, and relates to the underground construction technical field; the method comprises the following steps: using a down-hole hammer to drill a plurality of first bores in a marked circular area, wherein the down-hole hammer is provided with a first drill bit, and the diameter of the first drill bit is d2; using a second drill bit with the diameter d3 (d3>d2) to replace the first drill bit, and drilling a plurality of second bores in the circular area; the plurality of second bores and unexpanded first bores are mutually connected, thus forming filling pile bores of assigned diameters. The large diameter filling pile construction in a hard ground floor in the prior art is slow in progress, and a cluster type down-hole hammer construction large diameter filling pile is expensive in price; the construction filling pile method can solve said problems.

Description

technical field [0001] The invention relates to the technical field of underground construction, in particular to a method for constructing cast-in-situ piles. Background technique [0002] The construction of cast-in-place piles usually uses a drilling rig to drive the drill bit to drill holes in the bottom layer, and then put a steel cage in the hole and pour concrete. After the concrete solidifies, it becomes a cast-in-place pile. The quality of the hole is not easy to ensure. When entering the rock formation, the impact hammer method, the roller cone drilling method, and the rotary cutting method are mainly used. Disadvantages of the current three methods: impact hammer method: the effect is too slow, the sediment is too thick and it is difficult to clean the hole; roller cone drilling method: the price of the roller cone bit is high, and the construction progress is slow; rotary excavation method: large-scale rotary excavation is required, the price is high, and the sit...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for constructing cast-in-place piles, so as to alleviate the technical problems in the prior art that the construction progress of large-diameter cast-in-place piles in the hard bottom layer is slow and the price of large-diameter cast-in-place piles is expensive for cluster-type down-the-hole hammer construction.

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