Combined down-hole hammer drilling tool and pile forming construction method thereof

Abstract

The invention relates to a combined down-hole hammer drilling tool and a pile forming construction method thereof. The combined down-hole hammer drilling tool comprises an open type down-hole hammer and a multi-layer toothed threaded drill pipe which are fixed through pins, shafts and sealing gaskets. An impactor of the open type down-hole hammer is a hollow impactor, a movable bottom door capable of being closed is arranged at the bottom of the open type down-hole hammer, reaming blocks are arranged on sides of the open type down-hole hammer, and a pressure air supply hole and a high-pressure exhaust and slag-removing groove are disposed in the open type down-hole hammer. The multi-layer toothed threaded drill pipe is composed of a drill pipe outer tube and a drill pipe inner tube, and the drill pipe outer tube is provided with an air pipe. During pile forming, a pile driver of the combined down-hole hammer drilling tool rotates forward to enter a designed pile bottom elevation, the movable bottom door at the bottom of the down-hole hammer is opened, and concrete is delivered by a high-pressure pump to form a pile through the drill pipe inner tube and the hollow impactor. According to the combined down-hole hammer drilling tool, holes and piles can be formed once, the process of the pile forming construction method is simple, benefits are high, and energy is saved.

Description

technical field [0001] The invention belongs to the field of construction, and relates to a drilling tool and a pile-forming method thereof, in particular to a combined down-the-hole hammer drilling tool capable of forming holes and piles at one time and a pile-forming method thereof. Background technique [0002] In recent years, with the continuous development of my country's construction field, high-rise and super high-rise buildings have become more and more dense, and the requirements for foundations have become higher and higher. In many areas, foundation pile ends must be embedded in rock formations to a certain depth to meet design requirements. For rock-socketing problems, down-the-hole hammer technology has gradually developed in the field of technical research in recent years. [0003] Since the 1980s, more than 100 patents have been researched on the hole-forming method of using the down-the-hole hammer technology in China. The technical level of hole formation. ...

AI Technical Summary

Problems solved by technology

[0006] Publication number CN101319599A discloses a side-suction reverse circulation drill bit. The main problem in the application process of the through-type down-the-hole hammer is that the gas expands rapidly when the drill bit is separated from the bottom of the hole during the strong suction hole, and a part of the gas carries tiny particles of rock powder. Escaping from the annular gap of the drill hole, due to the small gas flow in the outer ring gap, the upwind wind speed is insufficient to remove the rock dust from the drill hole, and the rock powder hangs on the hole wall and accumulates at the steps connected by the drill tool. Causes the loss of rock ore samples, and the accumulation of rock powder for a long time, especially when the hole encounters water, it is easy to cause problems such as diameter shrinkage and drill pinching.

[0032] The above-mentioned patents continue to innovate on the DTH hammer hole-forming method, energy consumption, and improvement of construction efficiency, but there are still the following defects: ① The functions of the DTH hammer and its combined drilling tool or pile driver are limited to It is impossible to form holes and piles at one time; ②In pile foundation engineering, firstly use down-the-hole hammer technology or down-the-hole hammer combined drilling tool technology to form holes, and then use other methods to form piles. Therefore, the construction efficiency is low or the cost is relatively high. high

Images