Construction method for enabling underground pipeline to horizontally and directionally penetrate through complex gravel-cobble stratum

Abstract

The invention belongs to the technical field of horizontal directional drilling, and particularly relates to a construction method for enabling an underground pipeline to horizontally and directionally penetrate through a complex gravel-cobble stratum. According to the method, the effect that the underground pipeline is effectively laid in the complex gravel-cobble stratum is achieved in the modethat a pipeline track is planned firstly, a drilling machine punches holes, then a reamer pulls back and reams the holes, and finally the pipeline is pulled back and laid; and drilling operation in the gravel-cobble stratum with higher strength requirements is achieved through a drill rod coupler of a specific structure. The method has the advantages that gravel-cobble strata can be avoided to themaximum extent in the pipeline laying process, effective drilling can be achieved by increasing the drilling strength in the gravel-cobble strata, and pulling-back reaming and slurry discharging operation are easy and effective; and the adopted drill rod coupler has the prominent advantages that connecting structure strength is high, two sections of drill rods are not prone to loosening and slipping, a coupling structure is easy and convenient to assemble and disassemble, and finally the drill rod coupler meets the requirement for high-strength drilling in the gravel-cobble stratum.

Description

technical field [0001] The invention belongs to the technical field of horizontal directional drilling, and in particular relates to a construction method for underground pipelines horizontally and directionally crossing complex pebble strata. Background technique [0002] Horizontal directional crossing, that is, horizontal directional drilling technology, refers to an underground pipeline laying technology without excavating the ground. Its operation steps mainly include site selection, drilling, and laying. Among them, when selecting a site, it is necessary to explore and avoid the pebble and gravel strata that are difficult to drill, and at the same time, it is necessary to do a good job in risk control and assessment during the drilling process. First of all, before the drilling construction, it is necessary to carry out the survey of the relative density of the pebble layer distribution in the construction area, so as to effectively avoid the crossing track crossing th...

AI Technical Summary

Problems solved by technology

[0004] However, the construction method in this invention patent has the problem that the pebble formation cannot be detected during the construction process.

This invention patent cannot evaluate the relative distribution of pebble formations, so it cannot reduce the occurrence of high-density pebble formations, and at the same time, it cannot monitor the crack expansion and hole collapse accidents during the drilling process in real time

Images