Treatment method for hanging sinking stop due to expansive soil in well sinking

Abstract

The invention provides a treatment method for hanging sinking stop due to expansive soil in well sinking. When the hanging sinking stop is caused by the expansive soil in the well sinking construction process, if the distance between the sinking stop position and the well sinking elevation exceeds 2 meters, blast holes are uniformly distributed in the surrounding earthwork of the lower part of a blade foot, the expansive soil which causes hanging stop is subjected to small equivalent blast, and the expansive soil is blasted; and if the distance between the sinking stop position and the well sinking elevation is less than 2 meters, a blast working face cannot be established, sinking support points are uniformly arranged at the well sinking blade foot, and then the earthwork at the lower part of the blade foot is symmetrically punched by using a high-pressure water gun with flat tube head till the sunken well is sunken. By the method, the contact area of the earthwork and the tube wall is effectively reduced on the premise that the outer wall structure of the sunken wall is not affected, and the super-normal lateral frictional resistance is eliminated, so that the sunken well is uniformly loosened and sunken, the sunken well is prevented from deviating, the construction period is not delayed, and the engineering quality and the construction efficiency of well sinking construction are effectively improved.

Description

technical field [0001] The invention relates to a caisson construction method, in particular to a processing method for caisson suspension due to expansive soil. Background technique [0002] In mine construction, the caisson construction method is often used. The so-called caisson construction method means that the caisson body is first made on the ground or pit, that is, the caisson member body with openings and made of reinforced concrete is made. As the soil level in the well gradually decreases, the caisson body overcomes the frictional resistance between the outer wall of the caisson and the soil layer with its own weight, and sinks continuously to reach the predetermined construction design position. [0003] The characteristics of the caisson construction method mentioned above are that the caisson structure has a large cross-sectional size and stiffness, strong bearing capacity, good impermeability and durability, and the internal space is available, which can be u...

AI Technical Summary

Problems solved by technology

This construction method not only has a long period and difficult construction, but also if the operation is improper during the loading process, it is easy to cause uneven stress on the circumference of the caisson, which will cause the caisson to deviate during the continuous sinking process.

Therefore, only by loosening the expansive soil on the outer wall of the caisson can the caisson sink. One method of loosening the earth is to use mechanical drilling from the upper part and then add mechanical vibration. location, and the vibration of the external force is also easy to damage the concrete structure, resulting in damage to the caisson

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