CN102878351A - Pipeline laying method of long-distance coal conveying pipeline - Google Patents

Abstract

The invention discloses a pipeline laying method of a long-distance coal conveying pipeline. The method comprises the following steps that A, a pipeline is imbedded below a frost line, and an earth covering depth from the top of the pipeline to a natural terrace is not less than 1.0 m; B, when the pipeline is laid in a gravel area, the over excavation of 0.2 m is required, a fine earth or fine sand cushion layer which is 0.2 m thick is first paved necessarily at the bottom of a trench, and then, the pipeline can be lifted to be put in the trench after the fine earth or fine sand cushion layer is flat, when the trench for the pipeline in the gravel area is backfilled, the trench is first backfilled to 0.3 m above the top of the pipeline necessarily by using fine earth (sand), and then, the trench can be backfilled by using original earth, the maximal grain size of the backfilling fine earth is not more than 10 mm, and gravel blocks as the backfilling earth are not expected to be more than 250 mm; and C, accident cutoff valves and valve chests are arranged at two ends of the pipeline traversing a large river and at proper positions along the pipeline, and the pipelines within at least 50 m outside outer edge lines of two ends of the pipelines traversing large and medium rivers and gullies are expected to adopt a way the same as a traversing section. Not only is the wear to a pipe wall in a construction process reduced, but also the maintenance cost of the pipeline in a process that the pipeline is used for conveying coal slurry is reduced.

Description

The pipe laying method of the defeated coal of a kind of long-distance pipe

Technical field

The present invention relates to a kind of pipe laying method, be specifically related to the pipe laying method of the defeated coal of a kind of long-distance pipe.

Background technique

For the heavy caliber ore slurry pipeline of diameter more than 600mm, usually adopt " trench digging channelling ", " tube group butt welding " staggered parallel operating type during laying task.Take the corresponding position of laying of single pipe as a pipe station, its sequence of operation is: first stringing, and post-trenching, the welding of forming a team of carrying out again single pipe forms pipeline section, then pipe section lowering in backfill, so staggered carrying out.It all is very rough that there is backfill in this operating type, does not have strict control, and tube wall is had larger infringement, and has strengthened the pipeline maintenance costs etc. in later stage and lack.

Summary of the invention

The purpose of this invention is to provide and a kind ofly according to the long geological condition along the line apart from convey coal pipe different environment is adopted different laying methods, to satisfy the pipe laying method of the long defeated coal of a kind of long-distance pipe apart from the convey coal pipe needs.

Long apart from the convey coal pipe needs in order to satisfy, technological scheme of the present invention is to solve like this: the pipe laying method of the defeated coal of a kind of long-distance pipe be pipeline is imbedded underground, make coal slurry effectively be transported to the destination by pipe safety, its pipe laying method is carried out in the steps below:

A, pipeline are embedded in below the frost line, the thickness of earth-fill cover 〉=1.0m of Guan Dingzhi nature terrace;

When B, gravel area pipe laying, the requirement 0.2m that backbreaks, bottom of trench must at first be laid the thick fine earth of 0.2m or fine sand bed course, can the swing pipe hyposulculus after smooth, during the gravel area backfilling of pipe canal, must at first be backfilled to the above 0.3m in pipe top with fine earth (sand), then can use former earthen backfill, the maximum particle diameter of fine earth backfill is not more than 10mm, and the gravel piece of backfill should be greater than 250mm;

C, Large River are worn two ends and the pipeline of leap and are put according to the geology condition bit along the line, at least five accident block valves and valve chamber are set, pipeline is when wearing the big-and-middle-sized river of leap, rain wash ditch, and the pipelining in the outer at least 50m of two ends border line should the mode identical with the B step be laid;

D, pipeline maximum are laid the gradient for testing the coal slurry drift angle that records, the minimum value of angle of repose;

E, pipe trench bottom of trench width are determined according to external diameter, process for assembling and welding and the engineering geologic factors of pipeline;

F, pipeline try not to occur elbow, bend pipe in through section when highway crossing; For the hillside of large slope, should establish diaphragm wall, retaining wall, crab-bolt, intercepting ditch, guarantee pipeline stabilization;

G, go out inbound, various leap two ends, pipeline fluctuation section at pipeline, the both sides of be unearthed end, the vertical elbow of wide-angle should establish and be fixed pier.

The present invention compared with prior art, because relating to, convey coal pipe of the present invention reaches 1000 kilometers, the topography and geomorphology that passes through along the line is complicated, different environment is adopted different laying methods, not only reduce in work progress the wearing and tearing to tube wall, and reduced in the coal slurry conveyed in pipeline process maintenance cost to pipeline.

Embodiment

Below in conjunction with embodiment summary of the invention is further described:

Embodiment 1

The pipe laying method of the defeated coal of a kind of long-distance pipe is pipeline to be imbedded underground, makes coal slurry effectively be transported to the destination by pipe safety, and the pipe laying method is carried out in the steps below:

A, pipeline are embedded in below the frost line, the thickness of earth-fill cover 〉=1.0m of Guan Dingzhi nature terrace;

When B, gravel area pipe laying, the requirement 0.2m that backbreaks, bottom of trench must at first be laid the thick fine earth of 0.2m or fine sand bed course, can the swing pipe hyposulculus after smooth, during the gravel area backfilling of pipe canal, must at first be backfilled to the above 0.3m in pipe top with fine earth (sand), then can use former earthen backfill, the maximum particle diameter of fine earth backfill is not more than 10mm, and the gravel piece of backfill should be greater than 250mm;

C, Large River are worn two ends and the pipeline of leap and are put according to the geology condition bit along the line, at least five accident block valves and valve chamber are set, pipeline is when wearing the big-and-middle-sized river of leap, rain wash ditch, and the pipelining in the outer at least 50m of two ends border line should the mode identical with the B step be laid;

D, pipeline maximum are laid the gradient for testing the coal slurry drift angle that records, the minimum value of angle of repose;

E, pipe trench bottom of trench width are determined according to external diameter, process for assembling and welding and the engineering geologic factors of pipeline;

F, pipeline try not to occur elbow, bend pipe in through section when highway crossing; For the hillside of large slope, should establish diaphragm wall, retaining wall, crab-bolt, intercepting ditch, guarantee pipeline stabilization;

G, go out inbound, various leap two ends, pipeline fluctuation section at pipeline, the both sides of be unearthed end, the vertical elbow of wide-angle should establish and be fixed pier.

But given embodiment can not be interpreted as limiting the scope of the invention, thereby nonessential improvement and adjustment that the professional and technical personnel has done according to content and the design philosophy of foregoing invention also should belong to protection scope of the present invention.

Claims (1)

1. the pipe laying method of the defeated coal of a long-distance pipe, the method are pipeline to be imbedded underground, make coal slurry effectively be transported to the destination by pipe safety, it is characterized in that the pipe laying method carries out in the steps below:

A, pipeline are embedded in below the frost line, the thickness of earth-fill cover 〉=1.0m of Guan Dingzhi nature terrace;

When B, gravel area pipe laying, the requirement 0.2m that backbreaks, bottom of trench must at first be laid the thick fine earth of 0.2m or fine sand bed course, can the swing pipe hyposulculus after smooth, during the gravel area backfilling of pipe canal, must at first be backfilled to the above 0.3m in pipe top with fine earth (sand), then can use former earthen backfill, the maximum particle diameter of fine earth backfill is not more than 10mm, and the gravel piece of backfill should be greater than 250mm;

C, Large River are worn two ends and the pipeline of leap and are put according to the geology condition bit along the line, at least five accident block valves and valve chamber are set, pipeline is when wearing the big-and-middle-sized river of leap, rain wash ditch, and the pipelining in the outer at least 50m of two ends border line should the mode identical with the B step be laid;

D, pipeline maximum are laid the gradient for testing the coal slurry drift angle that records, the minimum value of angle of repose;

E, pipe trench bottom of trench width are determined according to external diameter, process for assembling and welding and the engineering geologic factors of pipeline;

F, pipeline try not to occur elbow, bend pipe in through section when highway crossing; For the hillside of large slope, should establish diaphragm wall, retaining wall, crab-bolt, intercepting ditch, guarantee pipeline stabilization;

G, go out inbound, various leap two ends, pipeline fluctuation section at pipeline, the both sides of be unearthed end, the vertical elbow of wide-angle should establish and be fixed pier.