Combined type air pressure balance tool pipe

Abstract

The invention relates to a combined type air pressure balance tool tube, comprising steel tubes and a hydro cylinder; each two steel tubes are connected by eight hydro cylinders in four groups; the tool tube is divided into an excavation cabin, an operation cabin, a decompression cabin and a material cabin in sequence; each two cabins are separated by a steel plate seal; a water tight sluice door is arranged in the center of the separated steel plate; the excavation cabin, the operation cabin, the decompression cabin and the material cabin are connected with a full air pressure construction life breath air safeguard system. The tool tube has the functions of full air pressure, local air pressure, error correcting, mudjacking, plugging and blasting stratum.

Description

technical field [0001] The invention relates to a pipe jacking in building construction, in particular to a tool pipe used for the continued construction of seawater pipes. Background technique [0002] The second sea-crossing pipeline in Shantou City is located upstream of the Haikou Bay Bridge in Shantou Port. The total length of the pipeline section is 2080m. It is constructed by pipe jacking method. It uses DN2000 steel pipe with a wall thickness of 22mm. ). [0003] The pipe jacking at 1200m south of the main channel of the bay is located in the silt and silty clay layer. The soil in this layer is saturated and flow-plastic, mainly silt mixed with a small amount of silt and shells. The silt and silty soil layer is highly compressible and low in strength. Consolidation, high sensitivity soft soil, low bearing pressure, poor foundation soil stability. [0004] At a distance of 110m to 140m from the working well, the pipe jacking needs to cross the block stone seawall of...

AI Technical Summary

Problems solved by technology

[0008] 1. The pipe jacking needs to pass through the loose stone layer of the seawall

[0009] 2. The pipe jacking needs to pass through the weathered granite layer

If the open tool pipe is used, when the pipe jacking passes through the 2000m seabed and the medium-coarse sand layer, the stability of the front soil cannot be maintained, and landslides are prone to occur, especially in the medium-coarse sand layer containing confined water, which cannot guarantee the safety of the operators. Safety

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