Open caisson sinking control system and construction method thereof

Abstract

The invention discloses an open caisson sinking control system, which comprises an engineering pile, a reinforced concrete bearing platform, a steel structure supporting column, a jack and a top pressing plate, wherein the engineering pile is provided with a plurality of engineering piles and arranged at the periphery of an open caisson; the pile top of the engineering pile is provided with the reinforced concrete bearing platform; the pile top of each engineering pile is inserted with the steel structure supporting column, the jack is arranged in the steel structure supporting column, a plurality of jacks are arranged and a plurality of jacks are arranged in sequence in the height direction of the steel structure supporting column, the top pressure plate is detachably arranged on the outer wall of the open caisson and the outer end of the top pressure plate is inserted into the steel structure supporting column, a plurality of jacks moving up and down alternately in an cylinder cooperate with the top pressure plate to apply supporting force or pressure to control the sinking depth of the open caisson. The open caisson sinking control system provided by the invention can be used for controlling continuous sinking of the open caisson and cooperating with the excavation in the open caisson, meanwhile, improving the working efficiency and reducing the safety risk of instability inthe sinking process of open caisson.

Description

technical field [0001] The invention relates to the technical field of foundation professional caisson sinking construction, in particular to a caisson sinking control system and a construction method thereof. Background technique [0002] Caisson is a construction technique for building deep foundation pits and underground structures. During construction, a reinforced concrete well body with openings is first made on the ground or in the foundation pit. After it reaches the specified strength, the soil is excavated and transported out in layers inside the well body. With the excavation and soil surface lowering, the caisson well body will Or with the assistance of other measures, overcome the frictional resistance between the soil wall and the counterforce of the blade foot, sink continuously until the design elevation, and then seal the back. [0003] The advantages of caisson construction technology are: deep (up to 50 meters) underground works can be constructed in a na...

AI Technical Summary

Problems solved by technology

Its disadvantages are that there are many construction procedures, high technical requirements, and difficult quality control. The deviation correction during the sinking process of the caisson is one of the keys to the construction of the caisson. If the deviation is not corrected in time during the sinking process of the caisson, the cannot be corrected after bit

Especially in caissons under deep soft soil foundation conditions, due to the poor bearing capacity of the foundation and small friction coefficient, water and mud gushing in the caisson during the sinking process, the sinking speed, direction and sinking design elevation are very difficult to control, etc. Construction problems, as well as safety and environmental issues such as damage to the surrounding environment, are relatively difficult to solve with existing technologies

[0004] CN101851930A discloses a caisson sinking device and a caisson sinking method with the device, which solves the problem of difficult-to-control spatial posture stability during the caisson sinking against resistance

[0005] 1. Because multiple pipe joints are used vertically to connect, that is, the slenderness ratio is large, and the caisson is heavy, it is easy to cause safety risks such as instability in the caisson sinking process

If this problem is solved, it is necessary to install a lot of joints between the pipe joints and the caisson structure in the entire height direction of the caisson, which will increase the workload and cost virtually, and the construction will be inconvenient

[0006] 2. The sinking process of each caisson has to go through the second stop work of the left and right jacks lowering in batches to disassemble, raise, and install pipe joints. The sinking speed is slow and the construction efficiency is low

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