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...

Examples

Embodiment Construction

[0025] The invention provides a construction method of original hole pushback in horizontal directional drilling, which includes the following steps:

[0026] Step one is the process of drilling pilot holes. The rig drills along the designed trajectory from the input end to the discharge end; generally, the pilot hole curve is as smooth as possible to facilitate subsequent pre-expanding construction and pipeline drag-back construction.

[0027] Step two, back-expanding process, as shown in Figure 1, the end of the drill pipe 4 of the unearthed end 3 is connected to a back expander 1, and the back expander 1 is used to expand the borehole 6 from the unearthed end 7 to the soil-entry end 3. The back expander 1 is fixedly connected with the drill rod 4 by a threaded fastener only at one end of the traveling surface. As in the prior art construction method, both the drill pipe 4 and the back expander 1 are hollow, and the back expander 1 is provided with a plurality of mud holes 2. Th...

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...

Examples

Embodiment Construction

[0025] The invention provides a construction method of original hole pushback in horizontal directional drilling, which includes the following steps:

[0026] Step one is the process of drilling pilot holes. The rig drills along the designed trajectory from the input end to the discharge end; generally, the pilot hole curve is as smooth as possible to facilitate subsequent pre-expanding construction and pipeline drag-back construction.

[0027] Step two, back-expanding process, as shown in Figure 1, the end of the drill pipe 4 of the unearthed end 3 is connected to a back expander 1, and the back expander 1 is used to expand the borehole 6 from the unearthed end 7 to the soil-entry end 3. The back expander 1 is fixedly connected with the drill rod 4 by a threaded fastener only at one end of the traveling surface. As in the prior art construction method, both the drill pipe 4 and the back expander 1 are hollow, and the back expander 1 is provided with a plurality of mud holes 2. Th...

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