Standby anti-drag device for horizontal directional drilling pipeline back dragging

Abstract

The utility model discloses a standby drag reduction device for horizontal directional drilling pipeline back dragging. The standby drag reduction device comprises a flexible lantern ring, a fixing piece and a traction rope. The flexible lantern ring is connected to the traction head in a sleeving mode through a fixing piece, one end of the traction rope is connected with the flexible lantern ring, the other end of the traction rope extends to the rear end of the pull-back pipeline along the outer wall of the pull-back pipeline and is connected with traction equipment, and the flexible lantern ring can be movably arranged on the outer wall of the pull-back pipeline in a sleeving mode through the traction equipment and the traction rope. And moving to the rear end of the pull-back pipeline along the pull-back pipeline, so that the pull-back pipeline is separated from the silt in the hole channel, and a separation gap is formed. The utility model relates to the technical field of underground engineering construction, and can solve the problem that a horizontal directional drilling pipeline in the prior art fails to pull back.

Description

TECHNICAL FIELD

[0001] The utility model relates to underground engineering construction technical field especially, relates to a horizontal directional drilling pipeline back -drawing spare drag reduction device. BACKGROUND

[0002] As one of trenchless technology, horizontal directional drilling construction technology can shorten the construction period and reduce the engineering cost, and is a truly safe, non-polluting and high-efficiency construction technology, which has achieved great development in recent years and is applied more and more in urban underground pipe network construction. The horizontal directional drilling construction process includes guiding and hole drilling, grading reaming, pipeline back -drawing and other process links, and the pipeline back -drawing process is the most important process link, which directly determines the success or failure of the whole pipeline construction process.

[0003] During the pipeline back -drawing process, the mechanical back -holding force increases due to the reasons such as too long back -drawing stop time (mud loss, mud sand holding force increase), hole collapse, mud viscosity force increase (mainly pipe and hole friction force increase), until the mechanical back -holding force cannot meet the pipeline back -drawing requirement, and then the pipeline back -drawing fails.

[0004] During the pipeline back -drawing process, when the mechanical back -holding force increases due to the reasons such as too long back -drawing stop time, hole collapse, mud viscosity force increase, and the mechanical back -holding force cannot meet the pipeline back -drawing requirement, the following measures are often taken: replacing a large -force horizontal directional drilling machine, pipe end ramming, etc. If the above measures still cannot meet the back -drawing requirement, another horizontal directional drilling machine is used to re -hole and wash hole along the two sides of the pipeline, and the pipeline back -drawing is re -performed after reducing the pipeline resistance.

[0005] Replacing a large -force horizontal directional drilling machine is limited by the maximum back -holding force allowed by the pipeline, which is easy to cause damage to the pipeline, and the replaced machine needs to be matched with the original drill pipe, otherwise it cannot operate. The machine needs to be fixed and adjusted in angle, the operation is complex, the pipeline is stagnant in the hole for a long time, the pipeline is easy to be tightly wrapped by mud sand in the hole, and the pipeline back -drawing cannot be performed. If the pipe end ramming measure is used, it is only suitable for steel pipes, and is not suitable for PE pipes, ductile cast iron pipes and other pipe materials commonly used in horizontal directional drilling construction. If another horizontal directional drilling machine is used to re -hole and wash hole along the two sides of the pipeline, the operation is complex, the time is long, the pipeline is easy to be damaged, the hole stability is affected, and the surface is greatly affected.

[0006] Therefore, it is necessary to provide a horizontal directional drilling pipeline back -drawing spare drag reduction device, which can solve the problem of horizontal directional drilling pipeline back -drawing failure in the prior art. SUMMARY

[0007] The utility model discloses a horizontal directional drilling pipeline back -drawing spare drag reduction device can solve the problem of horizontal directional drilling pipeline back -drawing failure in the prior art.

[0008] This utility model is implemented as follows:

[0009] A horizontal directional drilling pipeline pullback backup drag reduction device, wherein the horizontal directional drilling pipeline includes a drill rod, a back-reaming head connected to the rear end of the drill rod, a split head connected to the rear end of the back-reaming head, a traction head connected to the rear end of the split head via a matching U-shaped ring, and a pullback pipeline connected to the rear end of the traction head.

[0010] The aforementioned horizontal directional drilling pipe pullback backup drag reduction device includes a flexible collar, a fixing component, and a pulling rope. The flexible collar is sleeved on the traction head through the fixing component. One end of the pulling rope is connected to the flexible collar, and the other end of the pulling rope extends along the outer wall of the pullback pipe to the rear end of the pullback pipe and is connected to the pulling equipment. This allows the flexible collar to be movably sleeved on the outer wall of the pullback pipe via the pulling equipment and the pulling rope, and to move along the pullback pipe to the rear end of the pullback pipe, thereby separating the pullback pipe from the mud and sand in the borehole and forming a separation gap.

[0011] The flexible collar is a ring structure, and the inner diameter of the flexible collar is larger than the outer diameter of the pullback pipe.

[0012] The inner diameter of the flexible collar is 20cm larger than the outer diameter of the pullback pipe.

[0013] The traction head has a variable diameter structure that is narrow at the front and wide at the back, with the diameter of the rear end of the traction head being the same as the diameter of the pullback pipe. The two ends of the flexible collar are overlapped and fixed by fasteners, so that the diameter of the overlapped flexible collar is smaller than the diameter of the pullback pipe and is fixedly fitted at the variable diameter part of the traction head.

[0014] The flexible collar has a width of 10cm and a thickness of 10cm.

[0015] The aforementioned pull ropes are provided in several parts, and the pull ropes are evenly distributed circumferentially on the outside of the pullback pipe.

[0016] One end of the pulling rope is fixedly connected to the flexible collar via a U-shaped retaining ring.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] 1. Because this utility model is equipped with a flexible collar and a traction rope, when the pullback pipe fails to pull back, the flexible collar can be pulled by the traction equipment via the traction rope, so that the flexible collar moves from the front end to the rear end of the pullback pipe, thereby separating the mud and sand between the pullback pipe and the channel, forming a separation gap between the pullback pipe and the channel, reducing the frictional resistance between the pullback pipe and the channel, thereby reducing the pullback force and ensuring the smooth subsequent pullback of the pullback pipe, without being limited by the pipe material of the pullback pipe.

[0019] 2, the utility model discloses due to being equipped with flexible collar and fixing part, and the diameter of flexible collar is reduced after the partial overlap of flexible collar is fixed through thin iron wire, i. e. fixing part, can match the joint on the traction head, does not influence the use and back -dragging of back -dragging pipeline, simultaneously, the overlap part of flexible collar can break free from fixing part under the traction of traction rope, restores the normal size of flexible collar, to guarantee the movement of flexible collar along back -dragging pipeline.

[0020] 3, the utility model discloses simple structure, and easy to take material and make, convenient and reliable dismounting, simple and effective use can be recycled, and the cost is lower, and the smooth back -dragging of back -dragging pipeline is provided with the guarantee. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the installation schematic drawing of the utility model horizontal directional drilling pipeline back -dragging spare resistance reduction device (not use state);

[0022] Figure 2 It is the installation schematic drawing of the utility model horizontal directional drilling pipeline back -dragging spare resistance reduction device (use state);

[0023] Figure 3 It is the front view of flexible collar in the utility model horizontal directional drilling pipeline back -dragging spare resistance reduction device;

[0024] Figure 4 It is the side view of flexible collar in the utility model horizontal directional drilling pipeline back -dragging spare resistance reduction device;

[0025] Figure 5 It is the overlap state front view of flexible collar in the utility model horizontal directional drilling pipeline back -dragging spare resistance reduction device.

[0026] In the drawing, 1 drill rod, 2 back -expanding head, 3 sub head, 4 U type ring, 5 traction head, 6 back -dragging pipeline, 7 flexible collar, 8 fixing part, 9 traction rope, 10 hole, 11 U type snap ring. DETAILED DESCRIPTION

[0027] The utility model will be further described below in connection with the drawings and specific embodiment.

[0028] Please refer to the drawings Figure 1 and the drawings Figure 2 , the utility model is applied to the back -dragging construction of horizontal directional drilling pipeline, and wherein, horizontal directional drilling pipeline includes drill rod 1, back -expanding head 2 connected at the rear end of drill rod 1, sub head 3 connected at the rear end of back -expanding head 2, traction head 5 connected at the rear end of sub head 3 through matched U type ring 4 and back -dragging pipeline 6 connected at the rear end of traction head 5.

[0029] Horizontal directional drilling pipeline is the conventional equipment of the field, and the working process and working principle thereof will not be repeated here.

[0030] Please refer to the attached Figure 1 , attached Figure 2 and attached Figure 5 , a horizontal directional drilling pipe back dragging standby drag reduction device, comprising a flexible collar 7, a fixed part 8 and a pull rope 9; the flexible collar 7 is sleeved on the traction head 5 through the fixed part 8, one end of the pull rope 9 is connected with the flexible collar 7, the other end of the pull rope 9 extends along the outer wall of the back dragging pipe 6 to the rear end of the back dragging pipe 6 and is connected with the pulling device (not shown in the figure), so that the flexible collar 7 can be movably sleeved on the outer wall of the back dragging pipe 6 through the pulling device through the pull rope 9, and moved along the back dragging pipe 6 to the rear end of the back dragging pipe 6, so that the back dragging pipe 6 is separated from the silt in the hole 10, forming a separation gap.

[0031] Preferably, the flexible collar 7 can be made of fiber belt composite, which has a certain elastic deformation capacity and will not be broken or damaged when subjected to the pulling force of the pull rope 9. The size of the flexible collar 7 is adaptively adjusted according to the size of the back dragging pipe 6 to ensure that the flexible collar 7 can be moved from the front end of the back dragging pipe 6 to the rear end of the back dragging pipe 6 under the pulling action of the pulling device and the pull rope 9, as shown by the arrow direction in attached Figure 2 Since the back dragging pipe 6 has a certain thickness, the silt in the back dragging pipe 6 can be separated after the back dragging pipe 6 passes, and a separation gap is formed between the outer wall of the back dragging pipe 6 and the hole 10, so as to reduce the frictional resistance between the back dragging pipe 6 and the hole 10, thereby reducing the back dragging force and ensuring the smooth back dragging of the subsequent back dragging pipe 6.

[0032] In the initial state, the flexible collar 7 is sleeved on the traction head 5 in front of the back dragging pipe 6 through the fixed part 8, without affecting the use of the back dragging pipe 6.

[0033] Please refer to attached Figure 3 , the flexible collar 7 is in a ring structure, and the inner diameter of the flexible collar 7 is slightly larger than the outer diameter of the back dragging pipe 6.

[0034] The size of the flexible collar 7 can be adaptively adjusted according to the actual use requirement, and the inner diameter of the flexible collar 7 is slightly larger than the outer diameter of the back dragging pipe 6, so as to ensure that the flexible collar 7 can be moved along the back dragging pipe 6 when being pulled by the pull rope 9.

[0035] Preferably, the inner diameter of the flexible collar 7 is 20 cm larger than the outer diameter of the back dragging pipe 6.

[0036] Please refer to attached Figure 1 , attached Figure 2 and attached Figure 5The traction head 5 is a variable diameter structure that is narrow at the front and wide at the back. The diameter of the rear end of the traction head 5 is the same as the diameter of the pullback pipe 6. The two ends of the flexible collar 7 are overlapped and fixed by the fastener 8, so that the diameter of the overlapped flexible collar 7 is smaller than the diameter of the pullback pipe 6 and is fixedly sleeved at the variable diameter part of the traction head 5.

[0037] Since the radius of the traction head 5 is smaller than the diameter of the pullback pipe 6, while the diameter of the flexible collar 7 is larger than the diameter of the pullback pipe 6, in order to ensure that the flexible collar 7 can be stably fitted onto the traction head 5, the two ends of the flexible collar 7 are symmetrically overlapped to reduce the diameter of the flexible collar 7, so that it can adapt to the size of the traction head 5. The overlapped part is tied with fasteners 8 such as thin iron wires, so that the flexible collar 7 can fit snugly onto the traction head 5 without falling off, and can break free from the fasteners 8 under the pulling force of the traction rope 9, restoring the flexible collar 7 to its normal size.

[0038] The position of the flexible collar 7 on the traction head 5 can be adjusted according to actual usage requirements to avoid interference with the use and pullback of the pullback pipe 6.

[0039] Please see the appendix Figure 3 and attached Figure 4 Preferably, the flexible collar 7 has a width of 10cm and a thickness of 10cm.

[0040] The width and thickness of the flexible collar 7 can be adaptively adjusted according to actual usage requirements to ensure that the flexible collar 7 can form a sufficiently wide separation gap between the pullback pipe 6 and the orifice 10 after passing through, so as to reduce the pullback force.

[0041] Please see the appendix Figure 1 and attached Figure 2 The aforementioned pull rope 9 is provided with several ropes, which are evenly distributed around the outside of the pullback pipe 6.

[0042] Preferably, two pull ropes 9 can be symmetrically arranged to facilitate stable pulling of the flexible collar 7.

[0043] Please see the appendix Figure 1 and attached Figure 2 One end of the pull rope 9 is fixedly connected to the flexible collar 7 via a U-shaped retaining ring 11.

[0044] The connection between the traction rope 9 and the flexible collar 7 can be reliably connected by a U-shaped retaining ring 11, or other types of connectors can be used to ensure that the traction rope 9 and the flexible collar 7 are reliably connected and do not come apart during the traction process.

[0045] Please see the appendix Figure 1 To be continued Figure 5 The method of use and working principle of this utility model are as follows:

[0046] Before the back-dragging pipeline 6 is back-dragged, a flexible sleeve 7 with a diameter of 20 cm larger than that of the back-dragging pipeline 6 is fixed and sleeved at the variable-diameter position of the pulling head 5 by overlapping and fixing with the thin iron wire, i.e., the fixing member 8, and the flexible sleeve 7 is connected with the steel wire rope, i.e., the pulling rope 9, on both sides of the pulling head 5 by using the matching U-shaped clasp, and the two pulling ropes 9 are arranged along the two sides of the back-dragging pipeline 6 and are back-dragged synchronously with the back-dragging pipeline 6.

[0047] If the back-dragging pipeline 6 can be normally back-dragged, the utility model does not work, and the utility model is removed after the back-dragging pipeline 6 is back-dragged to the working pit, and the pulling rope 9 can be pulled out.

[0048] If the back-dragging force increases during the back-dragging process, causing the back-dragging pipeline 6 to be unable to be back-dragged, a winch is used as a pulling device at the rear of the back-dragging pipeline 6 to synchronously pull the pulling ropes 9 on both sides of the back-dragging pipeline 6, and under the action of the pulling force of the two pulling ropes 9, the flexible sleeve 7 is separated from the overlapping part of the thin iron wire, i.e., the fixing member 8, under the action of the pulling force, to form the flexible sleeve 7 larger than the back-dragging pipeline 6.

[0049] The winch is used to pull the pulling rope 9 at a uniform and slow speed, so that the flexible sleeve 7 moves at a uniform and slow speed from the front end of the back-dragging pipeline 6 to the rear end of the back-dragging pipeline 6 under the action of the pulling force, thereby separating the back-dragging pipeline 6 from the silt in the hole 10 through the flexible sleeve 7 to form a separation gap, and until the flexible sleeve 7 slides out of the end of the back-dragging pipeline 6, the frictional resistance between the back-dragging pipeline 6 and the hole 10 can be effectively reduced, and the subsequent back-dragging of the back-dragging pipeline 6 can be ensured to be smooth. At the same time, the grouting of the reamer can be strengthened, the slurry can be filled in the separation gap, and the subsequent back-dragging of the back-dragging pipeline 6 can be further ensured to be smooth.

[0050] The above is only a preferred embodiment of the utility model, and is not used to limit the protection scope of the utility model, therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A horizontal directional drilling pipeline pullback backup drag reduction device, wherein the horizontal directional drilling pipeline includes a drill rod (1), a back-reaming head (2) connected to the rear end of the drill rod (1), a split head (3) connected to the rear end of the back-reaming head (2), a traction head (5) connected to the rear end of the split head (3) via a matching U-ring (4), and a pullback pipeline (6) connected to the rear end of the traction head (5). Its characteristics are: The horizontal directional drilling pipeline pullback backup drag reduction device includes a flexible collar (7), a fixing member (8), and a pulling rope (9); the flexible collar (7) is sleeved on the traction head (5) through the fixing member (8), one end of the pulling rope (9) is connected to the flexible collar (7), and the other end of the pulling rope (9) extends along the outer wall of the pullback pipeline (6) to the rear end of the pullback pipeline (6) and is connected to the pulling equipment, so that the flexible collar (7) can be movably sleeved on the outer wall of the pullback pipeline (6) through the pulling equipment and the pulling rope (9), and move along the pullback pipeline (6) to the rear end of the pullback pipeline (6), so that the pullback pipeline (6) is separated from the mud and sand in the borehole (10) to form a separation gap.

2. The horizontal directional drilling pipeline pullback backup drag reduction device according to claim 1, characterized in that: The flexible collar (7) is a ring structure, and the inner diameter of the flexible collar (7) is larger than the outer diameter of the pullback pipe (6).

3. The horizontal directional drilling pipeline pullback backup drag reduction device according to claim 2, characterized in that: The inner diameter of the flexible collar (7) is 20 cm larger than the outer diameter of the pullback pipe (6).

4. The horizontal directional drilling pipeline pullback backup drag reduction device according to claim 1, characterized in that: The traction head (5) is a variable diameter structure that is narrow at the front and wide at the back. The diameter of the rear end of the traction head (5) is the same as the diameter of the pullback pipe (6). The two ends of the flexible collar (7) are overlapped and fixed by the fastener (8), so that the diameter of the overlapped flexible collar (7) is smaller than the diameter of the pullback pipe (6) and is fixedly sleeved at the variable diameter part of the traction head (5).

5. The horizontal directional drilling pipeline pullback backup drag reduction device according to any one of claims 1-3, characterized in that: The flexible collar (7) has a width of 10cm and a thickness of 10cm.

6. The horizontal directional drilling pipeline pullback backup drag reduction device according to claim 1, characterized in that: The aforementioned pull rope (9) is provided with several ropes, which are evenly distributed around the outside of the pullback pipe (6).

7. The horizontal directional drilling pipeline pullback backup drag reduction device according to claim 1 or 6, characterized in that: One end of the pulling rope (9) is fixedly connected to the flexible collar (7) through a U-shaped retaining ring (11).

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