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Method for reducing prop force with ring-shape mud sheath in pipe-jacking construction

A ring-shaped technology during construction, applied in the direction of pipeline laying and maintenance, pipes/pipe joints/fittings, mechanical equipment, etc., can solve the problem that the drag reduction effect is not very ideal, cannot be evenly distributed, and cannot form a stable and effective mud sheath etc. to achieve the effect of reducing frictional resistance and jacking force

Inactive Publication Date: 2009-05-20
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent proposes a method to reduce the frictional resistance between the pipe wall and the soil layer, the bentonite mud is pressed out through the grouting holes arranged on the pipe wall in the middle of the single pipe joint, forming point-like grouting
The mud squeezed out in this way is often concentrated near the grouting hole and cannot be evenly distributed in the surrounding voids
Therefore, a stable and effective mud sheath cannot be formed
In actual engineering, the drag reduction effect is not very ideal

Method used

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  • Method for reducing prop force with ring-shape mud sheath in pipe-jacking construction
  • Method for reducing prop force with ring-shape mud sheath in pipe-jacking construction

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Embodiment

[0016] Such as figure 1 , figure 2 As shown, the project example is the sewage pipe jacking project in the combined sewage treatment project in Shanghai. The project adopts Φ1650mm reinforced concrete grooved pipe, outer diameter Φ2030mm, wall thickness 190mm, the effective length of each section is 2000mm, and the total length is 2135mm. The project section is from Well No. 12 at the intersection of Langao Intersection of Zhongshan North Road to Dongxin Intersection of Guangfu West Road, with a total length of 231.5m and divided into two jackings.

[0017] The first jacking pass is constructed using the traditional point grouting method; the second jacking pass is constructed using the annular grouting method of the present invention.

[0018] In the first jacking journey, due to the point-like grouting method, the grouting work is not ideal, and the jacking force rises rapidly during the jacking. After 22 knots of jacking, when the jacking length is 45m, the grouting meas...

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Abstract

The present invention relates to a method for reducing jacking force by using ring slurry guard cover in pipe-jacking construction of building engineering technology field. Said method includes the following several procedures: (1), reinforced concrete pipe-jacking machine utilization procedure; (2), gap utilization procedure; (3), using slurry-pressing equipment to feed the bentonite slurry into slurry-pressing hole; and (4) making the bentonite slurry be diffused into earth body. Said invention also provides the concrete steps of the above-mentioned every procedure.

Description

technical field [0001] The invention relates to a method in the technical field of construction engineering, in particular to a method for reducing jacking force with an annular mud sheath in pipe jacking construction. Background technique [0002] At present, pipe jacking construction has been widely used in the construction of underground pipelines such as municipal sewage pipes. In pipe jacking construction, the jacking force directly affects the jacking efficiency. In order to reduce the frictional resistance between the pipe and the soil during jacking, the diameter of subsequent pipe joints is 10mm smaller than that of the pipe jacking machine. In this way, a gap of 10mm is formed between the pipe joint and the soil. When jacking, the drag-reducing mud of bentonite is injected into the outer wall of the pipe through the reserved channel on the pipe joint to form a mud sheath around the pipe, reducing the The frictional resistance between the outer wall of the pipe jo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L1/028
Inventor 沈水龙庞晓明蒋永勤唐翠萍
Owner SHANGHAI JIAOTONG UNIV
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