Construction method for enabling cable to pass through barrier

Abstract

The invention relates to a construction method for enabling a cable to pass through a barrier. The construction method for enabling the cable to pass through the barrier sequentially includes following steps: firstly, confirming a pipe hole path so as to obtain the total length and the specification of a cable sleeve, prefabricating the cable sleeve by sections, threading a steel wire lead rope through the cable sleeve in advance, clearing the inner wall of the cable sleeve section by section, and performing anticorrosion and mouth repairing on the cable sleeve after a qualified pressure test on the cable sleeve is completed; then, performing a simulation experiment, obtaining a slide friction coefficient of the cable sleeve, figuring out the maximum slide traction resistance, judging whether the maximum slide traction resistance is larger than permissive pull force of the cable, and if yes, installing idler wheel hoops for a second experiment so as to obtain a rolling friction coefficient of the cable sleeve, figuring out the maximum rolling traction resistance during the cable passing process, and confirming specifications of traction facilities of a main steel wire rope and the like; finally, drilling pipe holes, enabling the cable to pass through the cable sleeve, using a winching to tow the cable, using an excavator to assist in cable feeding, feeding the cable in the cable sleeve for a section after installing each batch of the idler wheel hoops until the whole cable completely passes through the cable sleeve, and performing a performance test on the cable which passes through the cable sleeve after two end mouths of the cable sleeve are blocked. The construction method for enabling the cable to pass through the barrier can substantially reduce passing resistance of the cable, and is safe and reliable.

Description

technical field [0001] The invention relates to a cable construction method, in particular to a construction method for cables passing through obstacles. Background technique [0002] At present, short-distance crossing is often encountered in the construction of cable crossing. When the cable laying line encounters small-distance rivers, ditches or buildings, the method of crossing from the bottom of the obstacle is usually adopted by the cable plus casing protection. Due to the short traversing distance, the cable traction resistance is small, and the abrasion of the cable during the passage through the bushing is not too serious. When the crossing distance is less than 500 meters, there are many successful cases where the cable directly passes through the bushing without protection. [0003] When the crossing distance reaches more than 500 meters, the traditional construction method of directly crossing the casing is mostly not applicable. First of all, because the long...

AI Technical Summary

Problems solved by technology

When the traction force is greater than the allowable tensile force of the cable, the cable will be plastically deformed, the current-carrying area will be reduced, the insulation layer will be damaged, or even broken; in order to improve the tensile performance of the cable, it is often necessary to customize high-strength tensile cables and cable sleeves Internal anti-corrosion protection treatment in the pipe is quite expensive

Secondly, if the outer sheath of the cable is not protected and directly passes through the long-distance casing, the outer sheath of the cable will be severely worn and its insulation and waterproof performance will be reduced.

In addition, the current method of sealing the two ends of the cable and the casing is usually a single blockage such as fireproof cement or asphalt horseshoe grease. The post-construction such as tower laying is easy to disturb the sealing layer, and the waterproof performance and strength of the traditional sealing layer cannot meet the requirements

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