Construction method for underground diaphragm wall penetrating through super-thick silt layer

Abstract

The invention provides a construction method for an underground diaphragm wall penetrating through a super-thick silt layer, and relates to the technical field of underground project construction. For constructing the underground diaphragm wall on a project field with the stratum of the super-thick silt layer, grooving quality is different to control, and the problems that the construction efficiency is low, a consumed working period is long, and consequently the project cost is increased exist. The construction method comprises the following steps that firstly, paying offing and grooving are conducted along the central line of an underground diaphragm wall to be constructed; secondly, three-axis cement mixing piles are applied and strook into the two sides of the underground diaphragm wall to reinforce the groove walls; thirdly, a guide wall is built on the three-axis cement mixing piles; fourthly, an open groove is partitioned into a plurality of unit groove sections, holes are drilled in the unit groove sections to a intense weathered layer, when excavation is conducted to a medium weathered layer, a rotary excavating drill is replaced to smash and remove the medium weathered layer and the intense weathered layer, and then detritus is grabbed; fifthly, silt at the bottom is brought out of the unit groove sections through a reverse circulation silt removing system, and slurry is poured into the unit groove sections; sixthly, steel bar cages are installed in the unit groove sections, and concrete pouring of the underground diaphragm wall is conducted.

Description

technical field [0001] The invention relates to the technical field of underground engineering construction, in particular to a construction method for an underground continuous wall penetrating through an ultra-thick silt layer. Background technique [0002] The underground diaphragm wall is a narrow and deep trench dug underground with the help of various grooving machines and the function of mud protection, and pouring appropriate materials in it to form a wall with anti-seepage, soil retaining and load-bearing functions. continuous underground wall. The underground diaphragm wall is an underground concealed project. Therefore, there are many uncertainties and unknowns in the construction process, especially in the complex geological conditions of the stratum. The degree of weathering of the rock strata is divided into: silt layer, strong weathered layer and moderately weathered layer from top to bottom, and the thickness of the silt layer is tens of meters. Under the e...

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Problems solved by technology

[0004] Aiming at the problems that it is difficult to control the quality of grooves when constructing an underground diaphragm wall in an engineering site with an ultra-thick silt layer, and the construction efficiency is low, the construction period is long, and the project cost is increased. The purpose of the present invention is to provide a through ultra-thick The construction method of the underground diaphragm wall in the silt layer improves the quality of the trench formation of the underground diaphragm wall, effectively controls the construction period and project cost of the trench formation in the rock, and ensures the construction quality of the underground diaphragm wall

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