Testing method for judging capability of cutting large-diameter pile foundation of shield cutter head tool

Abstract

The invention relates to the technical field of special shield engineering and particularly relates to a testing method for judging the capacity of cutting a large-diameter pile foundation of a shield cutter head tool. The testing method particularly comprises the following testing steps of: fixing a test pile; hoisting a shield tunneling machine, arranging the shield tunneling machine in place, debugging the shield tunneling machine, installing a reaction frame and assembling a negative ring; measuring an initial position of a cutter head and an initial height of each tool; developing the drilling test and after the test is completed, carrying out statistics on seven single indexes; judging whether each single index meets the requirement of the shield cutter head tool for directly cutting the large-diameter pile foundation; comprehensively judging the capacity of cutting the large-diameter pile foundation of the used shield cutter head tool. The testing method can provide basis for determining whether cutting on the large-diameter pile foundation is feasible and whether the cutter head tool is reasonable; the testing method is simple and convenient to test; under the existing originating conditions of a shield, the test can be carried out after the test pile is fixed, and the subsequent construction is not delayed; the test is carried out in the open-air soilless environment and the testing method is very convenient to obverse and measure.

Description

technical field [0001] The invention relates to the technical field of special shield tunneling engineering, in particular to a test method for judging the ability of a shield cutterhead cutter to cut large-diameter pile foundations. Background technique [0002] With the vigorous development of rail transit projects in major cities in my country, when shield tunnels are built in the central area of ​​cities, the front of shields often encounters underground obstacles such as pile foundations of existing buildings (structures). At present, there are two main methods for dealing with obstacle piles. One is traditional methods such as pulling piles after dismantling the superstructure, and artificially digging piles after excavating shafts. Although these traditional methods are simple and safe, they have high cost, great impact on the environment, and construction period. long; the other is to use the shield machine to directly cut off the pile foundation, [0003] This meth...

AI Technical Summary

Problems solved by technology

When cutting large-diameter pile foundations, problems such as excessive alloy cracking, severe tool wear, excessive thrust torque, difficulty in cutting steel bars, unsatisfactory length of steel bars, and inability to effectively break concrete are prone to occur. The construction risk and difficulty are much higher than those of cutting small-diameter piles. Pile foundation

Therefore, it is difficult to judge whether the initially configured cutter head has the ability to directly cut large-diameter pile foundations based on the existing experience in cutting small-diameter pile foundations.

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