Effective trenching construction method for underground diaphragm wall in slightly weathered limestone overlying sandy soil

Abstract

The invention provides an effective grooving construction method for an underground continuous wall in slightly-weathered limestone with overlying sandy soil. The method specifically comprises the steps of 1) performing core drilling in a grooving area to determine rock characters; 2) measuring the position of a setting-out calibration guide wall; 3) performing guide wall construction and determining the distribution of hole punching positions; 4) drilling guide holes, and installing guide rods; 5) punching a rock layer by using a heavy hammer and grabbing crushed rocks by using a grooving machine; 6) brushing a wall by using a square hammer and connecting the holes to form a groove; 7) cleaning the bottom of the groove to finish the grooving construction. The construction method provided by the invention has the advantages that the defects and the shortages of unsafe and unstable factors, slow construction progress, poor grooving quality and the like are overcome, and the effective, low-cost and high-accuracy grooving construction in the slightly-weathered limestone is realized; the construction effect is good, the grooving speed is fast, the construction process is simple and convenient and the construction period is greatly shortened.

Description

technical field [0001] The invention relates to a construction technology in the fields of construction, water conservancy, transportation, environment and other underground engineering, in particular to an effective groove-forming construction method for an underground diaphragm wall in slightly weathered limestone covered with sandy soil. Background technique [0002] In recent years, with the continuous deepening of urban construction in our country, the construction of underground railways has been launched in major cities. Due to the different geographical environment and stratum distribution of each city, it is necessary to build underground diaphragm walls under various geological conditions. The construction technology of underground diaphragm wall has been comprehensively developed and widely used in soft soil strata such as sandy soil, cohesive soil and flush fill soil in my country. However, there are still many technical difficulties and deficiencies in building...

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Problems solved by technology

[0005] Aiming at the defects in the prior art, the object of the present invention is to provide an effective groove-forming construction method for underground diaphragm walls in slightly weathered limestone overlying sandy soil, which overcomes the unsafe and unstable factors existing in the above-mentioned technical background And the shortcomings and deficiencies such as slow construction progress and poor trough forming quality, realize effective low cost and high precision trough forming construction in slightly weathered rock

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