Construction method of long spiral high-pressure mixing and spraying cement-soil continuous wall

Abstract

The invention provides a construction method of a long spiral high-pressure spraying cement-soil continuous wall, which comprises the following steps: 1) making a guide wall or digging a guide ditch along the center line of the pile, and determining the pile position of the spraying pile; 2) injecting the long spiral high-pressure spraying The slurry stirring pile-forming device is aligned with the pile position as the drilling center, and drilled into the hole; 3) Start the grouting pump, and use the long spiral high-pressure jet grouting to stir the pile-forming device during the lifting or lowering process of high-pressure rotary spraying until it is formed. 4) insert section steel into the spigot pile; 5) repeat the steps 2), 3) and 4) until the continuous cement-soil continuous wall is formed; 6) construct the joint beam; 7) backfill the foundation pit, Pull out the section steel after finishing. Compared with the general slope protection pile support system, firstly, the section steel can be recycled, and secondly, cement soil is used instead of concrete, so it is relatively more economical and more efficient, and can achieve the two walls of the supporting wall and the curtain wall. The water stop effect is also better than the system composed of general slope protection piles + rotary grouting piles.

Description

technical field [0001] The invention relates to a new type of cement-soil continuous wall construction technology in construction engineering, which is mainly used for water-stop curtain and foundation pit support projects, and is suitable for construction in various soil layers, especially in hard clay, sandy soil and It is more advantageous in strata such as gravel soil and strongly weathered soft rock. Background technique [0002] The stiff (higher strength) cement-soil diaphragm wall construction technology based on three-axis mixing piles, compared with the usual construction methods such as underground diaphragm walls and steel sheet piles, has the characteristics of environmental protection, high efficacy, and low cost. The soil area has been widely used in foundation pit water stop and support projects. However, affected by the construction capability of the equipment, when it is constructed in hard clay, medium-to-dense sandy soil, and pebble formations, there wil...

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Problems solved by technology

However, affected by the construction capability of the equipment, when it is constructed in hard clay, medium-to-dense sandy soil, and pebble formations, there will be phenomena such as unsteadiness and stuck drill, resulting in uneven pile quality and low construction efficiency. High cost and other issues, so the use in hard soil areas like Beijing is greatly restricted

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