Rock-entering grooving construction method by matching small-diameter down-the-hole hammer with slot milling machine

Abstract

The invention provides a rock-entering grooving construction method by matching a small-diameter down-the-hole hammer with a slot milling machine, which comprises the following steps that firstly, an underground diaphragm wall guide wall is divided into a plurality of parts, and the construction position of each part of slot section is determined; the positions of guide holes are determined according to the size of the slot sections, the hole guide mode adopts a hole arrangement mode, construction is conducted at the positions of the guide holes through the small-diameter down-the-hole hammer, so that the guide holes are obtained, and the guide holes aim at providing a milling free face for a slot milling machine and reducing the contact area of a milling wheel and a rock stratum; an upper soil layer is grabbed through a hydraulic grab bucket, and the slot sections are kept on the same plane after the upper soil layer is grabbed; and a slot milling machine is used for milling rocks in rock stratums of the guide holes, the rocks between the adjacent guide holes are milled off, the holes are connected to form a slot, the bottom is cleaned after slot milling is completed, and slot forming construction of slot sections is completed, so that rapid rock mass crushing and hole forming are facilitated, and efficient slot forming and hole forming are achieved.

Description

technical field [0001] The invention relates to the technical field of underground diaphragm wall construction, in particular to a construction method for drilling grooves into rocks with a small-diameter down-the-hole hammer and a groove milling machine. Background technique [0002] When constructing the underground diaphragm wall, it is first necessary to excavate the grooves. Before digging the grooves, the first thing to know is the geological conditions, and then according to different geological conditions, it is necessary to use the corresponding construction equipment for excavating the grooves. [0003] When troughing in the soil layer, the excavating equipment usually used is a hydraulic grab. The hydraulic grab is suspended by a wire rope and continuously excavated into the trough. Generally, the hydraulic grab can carry out normal excavation into the trough in the soil layer, but in When excavating to the rock formation, due to the high strength of the rock form...

AI Technical Summary

Problems solved by technology

Among them, when the rotary drill is used to guide the hole, it is difficult to guarantee the verticality of the guide hole, the efficiency of the guide hole is low, and the loss of the drill bit of the rotary drill is large, resulting in a high cost of the guide hole; When drilling, the drilling progress is extremely slow in rock formations greater than 50Mpa, and the damage to the impact hammer is great, and the maintenance time is long, which greatly affects the effect of connecting the wall to the groove. In some areas with high environmental protection requirements, Due to the large amount of noise, it is impossible to use impact hammers or impact reverse circulation drilling rigs for drilling construction; when large-diameter down-the-hole hammers are used for drilling construction, although the verticality of the drilling is improved, there are many auxiliary equipment and multiple sets are required The high-performance air compressor, air storage tank, high-pressure air inlet pipe and oil tank are connected, and the construction flexibility is poor, which affects the construction progress of the tank section, and the construction cost is very high

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