Prime hole reverse pushing construction method in horizontal orienting drilling and prime hole reverse pushing device

Abstract

The invention discloses a raw-hole reverse-pushing construction plan used for a horizontal directional boring. The plan includes the following: step 1, guiding hole boring procedure; step 2, reversing hole-enlarging procedure that a reverse-enlarger is connected with a tail end of a bore rod of a soil outlet end and the reverse-enlarger is used for reversely enlarging the hole from the soil outlet end to a soil inlet end; step 3, raw-hole reverse-pushing enlarging procedure that a reverse-pusher is connected with a tail end of the bore rod of the soil inlet end and a moving face of the reverse-pusher faces the soil outlet end, and the reverse-pusher is used for reversely enlarging the hole from the soil inlet end to a soil outlet end in the raw-hole channel; step 4, pipeline reverse-dragging procedure that when the hole channel diameter is larger than that of the reverser-dragging pipeline after enlarging, a reversely dragged pipeline is connected with a back end of the reverse-enlarger and a pipeline reverse-dragging work is carried out in the hole channel to realize a non-digging underground transmission of the pipeline. The invention can repeat the step 2 and the step 3. The invention overcomes a defect that a non-digging construction is always limited by a site condition of the soil outlet end and a practicality of the plan is enhanced. The invention also provides a raw-hole reverse-pusher used for the construction plan.

Description

Technical field [0001] The invention relates to the field of underground construction, in particular to a construction method applied to horizontal directional drilling, and an original hole reverser applied to the construction method. Background technique [0002] In the prior art, horizontal directional drilling has been frequently used in underground crossing operations of river channels, underground walls, and the like. After completing the construction preparations, the existing horizontal directional drilling trenchless construction technology mainly includes the following steps: [0003] First, drill the pilot hole, and the rig drills along the designed trajectory from the input end to the discharge end; during the drilling process, the pilot hole curve is made as smooth as possible to facilitate subsequent pre-expanding construction and pipeline drag-back construction. [0004] Afterwards, a reamer is used to ream the guide holes in stages, so that the diameter of the rea...

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned construction process in horizontal directional drilling, some construction difficulties caused by objective conditions are often encountered, such as: 1. The site conditions at the end of directional drilling are poor, such as narrow sites, rivers, swamps or greening Protecting the land, etc., so that the construction space for the drill pipe connection operation at the unearthed end is limited when the hole is reamed; Circular transportation from the entry end of the hole to the exit end of the pilot hole is difficult; 3. When the length of the trenchless construction is long, a large amount of drill pipe needs to be stored due to the reaming cycle, which increases the construction cost

The existence of the above problems has greatly troubled the implementation of horizontal directional drilling trenchless construction, resulting in serious consequences such as project delays or excessive construction time, and engineering accidents caused by hole expansion and collapse. technical barriers

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