Deep and large water taking open caisson structure in high-pressure water area and construction method

Abstract

The invention discloses a deep and large water taking open caisson in a high-pressure water area and a construction method thereof. The deep and large water taking open caisson comprises an open caisson, wherein the open caisson comprises a bottom sealing plate, a supporting short pile, a water taking pipe, outer wrapping concrete, a filling core material and a high-pressure jet grouting reinforcing body, the supporting short pile and the bottom sealing plate are used for providing vertical bearing capacity for the open caisson, the water taking pipe is used for taking water in the open caisson, the outer wrapping concrete and the filling core material are used for wrapping the water taking pipe so as to guarantee long-term normal use of the water taking pipe, and the high-pressure jet grouting reinforcing body is used for cement high-pressure jet grouting reinforcement at the junction of the water taking pipe and the side wall of the open caisson. According to the deep and large water taking open caisson, the construction efficiency of the deep and large water taking open caisson in the high-pressure water area can be effectively improved, and additionally, the open caisson structure has a strong protection effect on the water taking pipe, so that the long-term normal use requirement of the water taking pipe can be met.

Description

technical field [0001] The invention relates to the technical field of caisson construction, in particular to a deep and large water intake caisson in a high water pressure area and a construction method thereof. Background technique [0002] In recent years, with the vigorous advancement of urbanization, the shortage of urban water resources has become more and more prominent, which has prompted the rapid development of long-distance pipe jacking water diversion projects in my country. As an important part of the water diversion project, the caisson structure has been widely used in the water intake project, and can be used as a jacking reaction support structure and a temporary receiving structure for water intake. Compared with the caisson foundation used in the traditional foundation engineering field, in the field of municipal water diversion engineering, due to the large difference between the elevation of the water intake point and the surface elevation outside the wa...

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Problems solved by technology

In addition, since the location of the caisson is close to the water intake point, the groundwater of the site is often connected with the surface water of the water intake point, and the water level is high. construction risk

[0003] In current engineering practice, in order to reduce the frictional resistance during the sinking process of caissons, thixotropic mud drag reduction method is usually used, but for deep and large caissons with municipal water intake, it is often difficult to meet the construction requirements only by thixotropic mud

Especially when the formation is a water-rich sand layer, the self-stability of the sand is poor. During the sinking process of the caisson, the sand is mixed into the thixotropic mud, which will greatly reduce the drag reduction effect of the mud, and easily cause problems such as difficulty in sinking the caisson.

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