Desilting method of gravel bed dredging system of immersed tube tunnel

Abstract

The invention provides a desilting system for an immersed tube tunnel gravel foundation bed. The desilting system comprises a foundation trench. The foundation bed is laid in the foundation trench and comprises a block stone layer and a gravel layer which are arranged from bottom to top. The gravel layer is internally provided with desilting pipes. Holes are formed in the pipe walls of the desilting pipes. Silt pumps are connected to the desilting pipes. According to the desilting system for the immersed tube tunnel gravel foundation bed, when the foundation bed is laid, the desilting pipes are buried in the gravel layer; when silt exists on the foundation bed, the silt pumps are opened, and the silt enters the desilting pipes through gaps of the gravel layer and is removed; the system is simple in structure, easy to operate, not prone to being affected by water flow, climate and other environmental factors and good in desilting effect; the laid foundation bed structure is not affected, the installing precision of an immersed tube can be ensured in a later period, and the service life of a tunnel is prolonged.

Description

technical field [0001] The invention relates to the technical field of immersed tube tunnel construction, in particular to a desilting method for an immersed tube tunnel gravel bed dredging system. Background technique [0002] Underwater tunnels often use the immersed tube method. The entire tunnel immersed tube is composed of multiple pipe joints. The pipe joints are placed one by one on the gravel bed at the bottom of the water. It takes several days from the laying of the gravel bed to the installation of the pipe joints. Due to some The sediment content in the water area is relatively high, and there is a certain thickness of silt on the original mud surface of the top of the foundation trench. Due to the change of sediment concentration in the flood season, the disturbance of the water by ships driving on the nearby channel, and the influence of weather and climate factors, it will cause Increased silting, even resulting in silting, the silt on the gravel bed in the fo...

AI Technical Summary

Problems solved by technology

There are many problems in these two methods. The former is more troublesome to operate, is easily affected by the water flow, and has poor anti-silting effect; The ship is easy to shake, so that the working part touches the foundation bed, destroys the laid foundation bed, and affects the installation accuracy of the immersed tube. Fixed, increasing the difficulty of operation

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