Construction method for limiting thermal expansion and cold shrinkage of steel belt reinforced polyethylene helical bellows

A technology of polyethylene spiral and construction method, which is applied in the direction of pipeline connection arrangement, pipeline laying and maintenance, pipe/pipe joint/pipe fitting, etc., which can solve the problem of large thermal expansion and cold contraction, increased construction cost, cracking and water leakage at the pipe mouth, etc. problems, to achieve the effect of reducing thermal expansion and contraction, reducing the frequency of later maintenance, and reducing erosion

Inactive Publication Date: 2019-01-29
CHINA MCC17 GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Steel belt reinforced polyethylene spiral corrugated pipes are increasingly used in municipal sewage and rainwater collection systems in cities and towns. According to their installation process requirements, they are usually buried outdoors. During the construction process in areas with large temperature differences, the bellows will expand and shrink greatly due to the temperature, and the welded nozzles often suffer from cracking and water leakage. This phenomenon is particularly prominent in large-diameter bellows. In addition, maintenance and rework Difficult and seriously increases the construction cost

Method used

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  • Construction method for limiting thermal expansion and cold shrinkage of steel belt reinforced polyethylene helical bellows
  • Construction method for limiting thermal expansion and cold shrinkage of steel belt reinforced polyethylene helical bellows

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The construction method for restricting the thermal expansion and contraction of the steel belt reinforced polyethylene spiral corrugated pipe provided by the present invention includes the following steps:

[0039] Step one, construction preparation

[0040] Clean the road to be excavated, determine the specifications and position of the corrugated pipe 5 according to the requirements of the drawings, and calculate the width and the width of the foundation pit 1 needed to be excavated by using the width of the foundation pit = pipe diameter + 2 × the width of the working surface on one side of the pipeline Depth, level the pavement to be excavated, measure according to the requirements and release the center line and sideline of foundation pit 1, and draw the actual shape of foundation pit 1 with gray lines.

[0041] In this step, each line is clearly marked to facilitate the construction of the foundation pit 1.

[0042] Step 2. Excavation of foundation pit 1

[0043] Excavati...

Embodiment 2

[0066] Compared with the embodiment 1, the method selected in step 4 is different in this embodiment: for the corrugated tube 5 of medium caliber such as DN500-DN1400, the composite electric heating tape heating shrinkage tube connection method is adopted. First, the corrugated tube 5 is cleaned. If there is dirt, the surface of the bellows 5 in the welding area should not be exposed to moisture or oil. If it does, it needs to be cleaned with a wet towel or flux solvent. The bellows 5 is welded according to the prescribed operation. After the welding is completed, the weld seam still needs to be visually inspected; the large-diameter bellows interface is reinforced by the bellows connection auxiliary device 7.

Embodiment 3

[0068] Compared with embodiment 1, the method selected in step 4 is different in this embodiment: for the outer wall of large-diameter corrugated pipes above DN1400, the combined process of connecting electric heating tape and connecting heat shrinkable pipe is adopted, and at the same time, polyethylene welding wire is used for the inner wall of the bellows 5 interface. For hot-melt extrusion welding, the welding seam still needs to be visually inspected after the welding is completed; for the large-diameter bellows interface, the bellows connection auxiliary device 7 is used for reinforcement.

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Abstract

The invention discloses a construction method for limiting thermal expansion and cold shrinkage of steel belt reinforced polyethylene helical bellows, and belongs to the field of construction of bellows. The construction method for limiting thermal expansion and cold shrinkage of the steel belt reinforced polyethylene helical bellows successively comprises the steps of construction preparation, excavation of a foundation pit, spacer construction, bellow location and connection, bellow fixation, closed water test and bellow backfilling. Thus, the problems that the amount of thermal expansion and cold shrinkage of bellows affected by the temperature is large, and a welded tube opening always cracks due to pulling and then leaks water are solved. The construction method is simple to construct, and is safe and reliable, and the quality of a welded junction is ensured.

Description

Technical field [0001] The invention belongs to the field of corrugated pipe construction, and particularly relates to a construction method for restricting thermal expansion and contraction of a steel belt reinforced polyethylene spiral corrugated pipe. Background technique [0002] Steel belt reinforced polyethylene spiral corrugated pipes are increasingly used in urban municipal sewage and rainwater collection systems. According to their installation process requirements, they are usually buried outdoors. However, due to the characteristics of the corrugated pipe polyethylene material, it is used day and night in northwest China. During the construction process in areas with large temperature differences, the bellows will expand and shrink more due to the temperature, and the welded pipe mouths often appear to be cracked and leaked. This phenomenon is particularly prominent in large-diameter bellows, plus maintenance and rework It is more difficult and seriously increases the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L1/038F16L1/11F16L47/02
CPCF16L1/038F16L1/11F16L47/02
Inventor 石强强张鸿羽陈扬
Owner CHINA MCC17 GRP
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