Foundation pit bracing water stopping structure with support pile and three-axis stirring pile arranged in cased drilling manner

Abstract

Provided is a foundation pit bracing water stopping structure with a support pile and a three-axis stirring pile arranged in a cased drilling manner. The support pile is constructed on the outer side of a foundation pit; the stirring pile is constructed in a support pile area in a three-axis stirring manner; and the support pile directly cuts a pile body on the three-axis stirring pile for construction, and the whole bracing water stopping structure is formed. The three-axis stirring pile is large in power, and can perform stirring in strong-weathered rock and the above stratum. Compared with a conventional small diameter cement stirring pile, the beneficial effects of being small in number of lap joints, good in water stopping effect, high in construction efficiency, high in stratum adaptability and the like are achieved; and compared with a jet grouting pile, the beneficial effects that the water stopping effect is good, and price is low are achieved. According to the foundation pit bracing water stopping structure with the support pile and the three-axis stirring pile arranged in the cased drilling manner, the support pile and the three-axis stirring pile are combined together, construction is performed in the manner that the support pile and the three-axis stirring pile arranged in the cased drilling manner, the stratum condition can be improved, the problem of hole collapse of the support pile is effectively solved, a water stopping effect better than that of the conventional stirring pile and the jet grouting pile can also be achieved, meanwhile the occupied space of a supporting structure is saved, and the water stopping capacity of an existing pile-in-row bracing water stopping structure is enhanced.

Description

【Technical field】 [0001] The invention relates to the technical field of civil engineering, in particular to foundation pit support operation technology. 【Background technique】 [0002] At present, the pile-row enclosure and water-stop structure that is widely used in foundation pit support includes support piles + rotary grouting piles between piles (such as attached figure 1 ), supporting piles + small-diameter cement mixing piles on the outside (if attached figure 2 ), support pile + large diameter three-axis mixing pile (if attached image 3 ), the practice shows that these two kinds of enclosure structures are easy to construct and have formed a set of mature construction technology. However, there are many problems in these two enclosure structures. [0003] The rotary grouting piles between support piles are limited by geological conditions, construction team technology and management level, the construction quality is uneven, and there will be quality problems su...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the above situation, the present invention adopts a new foundation pit enclosure water-stop structure to solve the defects in the existing foundation pit enclosure structure

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