Trenchless polypropylene cable protective pipeline and preparation method therefor

Abstract

The invention discloses a trenchless polypropylene cable protective pipeline and a preparation method therefore. In order to overcome the defect that an existing polypropylene cable protective pipeline is low in tensile strength and low in ring stiffness, the pipeline disclosed by the invention is prepared from the following components: polypropylene resin, a DH-3 additive, a composite stabilizer, mother back-feed, an orange-yellow pigment and an orange-red pigment. The pipeline has the advantages that the pipeline is specially used for construction of a trenchless project in the field of power systems to improve the construction overtex distance of the pipeline so as to satisfy the requirements of directly crossing riverways and houses; the ring stiffness of the pipeline is ensured while the tensile strength of the pipeline is improved; and the cost is not increased.

Description

technical field [0001] The invention relates to the field of pipelines, in particular to a polypropylene cable protection pipeline used in the construction of trenchless projects in the field of electric power systems and a preparation method thereof. Background technique [0002] Laying, detecting, repairing and updating underground pipelines without excavating (or less excavating) the surface is called trenchless construction. Trenchless construction places high demands on the pipeline, especially the tensile strength and ring stiffness of the pipeline. After the multi-section base material pipe is welded into a whole pipe, one end of it reaches the preset position under the pull of the pipe jacking machine. During the pulling process of the pipe jacking machine, the main body tensile strength, hot-melt welding tensile strength and elongation at break of the pipe are all critical. The ring stiffness is a comprehensive parameter of the plastic buried pipeline's ability to...

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Problems solved by technology

[0003] At present, the maximum distance between the construction top distance of polypropylene cable protection pipes (that is, the overall length of multi-section substrate pipes after welding) is about 200 meters, but in the construction of trenchless projects in the field of power systems, cable protection pipes often directly For rivers, houses, and construction top distance requirements often exceed 200 meters, which leads to the ring stiffness of the cable protection pipe cannot meet the construction requirements, and the pipe may undergo excessive deformation or buckling instability failure

To increase the ring stiffness, an excessively large section moment of inertia must be used, resulting in too many pipe materials and high cost

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