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Construction method for pipeline crossing river

A technology for crossing rivers and construction methods. It is applied in pipeline laying and maintenance, pipes/pipe joints/fittings, mechanical equipment, etc. It can solve the problems of imported equipment, laying costs, low technical requirements, and slow construction, so as to save time. Effect

Inactive Publication Date: 2014-05-07
SHAANXI LONGHAI ENG CONSTR
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Natural gas pipelines for long-distance transportation often need to cross rivers. Currently, bare laying, ditch-buried and semi-ditch-buried laying, and horizontal directional drilling are commonly used. Although the construction period of horizontal directional drilling is short, it is limited by geological conditions and requires imported equipment. very high
The cost and technical requirements of bare laying, trench buried and half trench buried laying are not high, but repeated precipitation is often required when trenching, and construction is slow

Method used

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Embodiment Construction

[0012] Below in conjunction with embodiment the present invention is described in more detail.

[0013] The invention is a construction method for a pipeline crossing a river, comprising the following steps:

[0014] Step 1: Excavate diversion ditches and build upstream and downstream cofferdams. The outer slope of the cofferdam is 1:1.5 and the inner slope is 1:1. The top of the cofferdam is built with sand in woven bags, and the outer side is laid with waterproof checkered cloth.

[0015] Step 2, excavating double rows of deep wells in layers,

[0016] Minimum well depth h min = h p +Δh + iL, the number of well point tubes , well spacing

[0017] where h p is the required precipitation depth at the center of the trench bottom, Δh is the depth at which the groundwater level falls below the bottom of the trench, i is the hydraulic gradient, L is the horizontal distance from the center of the well point to the center line of the trench bottom, and Q is the total Wate...

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PUM

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Abstract

Provided is a construction method for a pipeline crossing a river. The construction method comprises the first step that a flow guide ditch is dug, and an upstream cofferdam and a downstream cofferdam are built; the second step that dual rows of deep wells are dug in a layered mode; the third step that the pipeline is placed in a pipe ditch, a steel pipe is pressed by a saddle-shaped ballast block, a rubber plate is arranged on the lower portion of the ballast block in a cushioned mode, then the pipe ditch is refilled, the cofferdams are removed, and the flow guide ditch is refilled. The pipe ditch is dug at one time, the flow guide ditch is dug outside the area, repeat rainfall is not needed, and time is saved.

Description

technical field [0001] The invention relates to the field of pipeline laying, in particular to a construction method for pipelines crossing rivers. Background technique [0002] Natural gas pipelines for long-distance transportation often need to cross rivers. Currently, bare laying, ditch-buried and semi-ditch-buried laying, and horizontal directional drilling are commonly used. Although the construction period of horizontal directional drilling is short, it is limited by geological conditions and requires imported equipment. very high. The cost and technical requirements of bare laying, ditch buried and semi-ditch buried laying are not high, but repeated precipitation is often required when trenching, and construction is slow. Contents of the invention [0003] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a construction method for pipelines crossing rivers, which adopts one-time excavation to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L1/16
CPCF16L1/16
Inventor 刘斌
Owner SHAANXI LONGHAI ENG CONSTR
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