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Down-ditch construction method for laying heavy caliber pipeline

A technology of large-diameter pipelines and construction methods, which is applied in the construction field of laying large-diameter pipelines under the ditch, can solve the problems of unguaranteed construction safety, difficulty in unified coordination and command, and increased construction costs, so as to ensure the safety of people and equipment, The effect of saving equipment investment and preventing dumping accidents

Inactive Publication Date: 2004-12-29
NO 3 BRANCH OF SHENGLI PETROCHEM BUILDING CO LTD SHENGLI OIL FIELD
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AI Technical Summary

Problems solved by technology

At that time, each construction unit had only two 70T pipelayers. If it was necessary to concentrate 6 70T pipelayers for joint trenching operations, it would not only be difficult to deploy and increase the construction cost, but also difficult to unify due to the complex terrain and unfavorable soil conditions. Coordinating and commanding, construction safety cannot be guaranteed, once a personal or equipment safety accident occurs, there will be great losses

Method used

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  • Down-ditch construction method for laying heavy caliber pipeline
  • Down-ditch construction method for laying heavy caliber pipeline
  • Down-ditch construction method for laying heavy caliber pipeline

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Embodiment Construction

[0015] An embodiment is illustrated in conjunction with the accompanying drawings:

[0016] Depend on figure 1 As shown, the basic construction procedures of the present invention are: construction preparation, primary excavation of the pipe trench, pipe transfer and detection, secondary excavation of the pipe trench, and trenching of the pipeline. The brief technical contents (or sub-processes) of each process are:

[0017] Construction preparation: including laying out the center of the pipeline and the upper opening, determining the distance between partition walls and lifting points, and sealing off both ends of the pipeline.

[0018] One-time excavation of pipe trenches: including segmental excavation of reserved partition walls, excavation of sump pits at the bottom of trenches, and pumping and drainage of accumulated water in trenches.

[0019] Pipe transfer and inspection: including hanging the pipe partition wall, inspecting the anti-corrosion layer and repairing. ...

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Abstract

The present invention is the construction process of laying wide bore pipe into pipe canal and relates to one important pipeline construction step. The present invention features that during excavating pipe canal, one soil partition wall is preserved in each certain distance; the pipe is first hoisted with two pipe layers and settled on the partition walls, and the initial end of the pipe is lifted before the soil partition wall is dug out with excavator and then settled slowly into the pipe canal; and all the partition walls are dug out successively and the pipes are settled in the pipe canal. The construction process includes the main steps of: preparation, the first pipe canal excavation, shifting pipes and detection, the second pipe canal excavation, and laying the pipes. The main advantages includes using two pipe layers only, low cost, low power consumption, simplified construction process, short construction period, etc.

Description

(1) Technical field [0001] The invention relates to a construction method for laying underground pipelines, in particular to a construction method for laying large-diameter pipelines in trenches. (2) Background technology [0002] Started in 2001, the West-to-East Gas Pipeline Project starts from Xinjiang in the west and ends in Shanghai in the east, with a total length of more than 4,000 kilometers. It is an unprecedented large-diameter, large-wall-thickness, high-pressure long-distance natural gas pipeline project in China. Its diameter is 1016 mm, wall thickness is 26.2 mm, working pressure is 10 MPa, and each 10-meter-long steel pipe weighs 7.5 tons. Our company won the bid for the main trunk line of the 26th bid section, with a length of 68 kilometers. It is located in the Jiangnan water network area of ​​Wuxi and Suzhou. The ponds are densely covered, the rivers and canals are criss-crossed, and the paddy and dry fields are staggered, which brings many difficulties to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L1/028
Inventor 张克明王斌菅宪忠陈勤功阎福明昝吉华王建华
Owner NO 3 BRANCH OF SHENGLI PETROCHEM BUILDING CO LTD SHENGLI OIL FIELD
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