Rapid extraction system and rapid extraction process for directional drilling counterweight pipe

Abstract

The invention provides a quick extraction system and a quick extraction process for a directional drilling counterweight pipe. The quick extraction process comprises the following steps: driving a wooden plug into a tail end socket of the counterweight pipe; one end of the steel wire rope is connected with the wooden plug, and the other end of the steel wire rope is hung on a flange at the head end of the counterweight pipe; coating the top of the tail end of the wooden plug with sealing grease; the plate-shaped piece is fixed with a flange at the head end of the counterweight pipe; the water injection pipe and the exhaust pipe penetrate through the plate-shaped piece and the flange and are arranged at the head end of the counterweight pipe; water is injected into the counterweight pipe, and the plate-shaped piece is connected with the cross-shaped support of the steel pipe mop head; the steel wire rope is pulled out of the counterweight pipe, every time 1-2 PE pipes are pulled out, the wooden plug in the pipe is pulled into the PE pipes, water pressure breaks through the sealing grease to form a hole, and water continuously flows out; a steel wire rope is sleeved on the outer wall of the PE pipe, and the counterweight pipe is pulled out by the steel wire rope. The system comprises a counterweight pipe, a wooden plug, a steel wire rope, an end socket, a flange, a plate-shaped piece, a water injection pipe and an exhaust pipe. The process provided by the invention can realize continuous pipe dragging. The system is reasonable in design, the dead weight of the counterweight pipe to be taken can be reduced during pipe dragging, and traction force is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of horizontal directional drilling construction, and more specifically, to a rapid extraction system and rapid extraction process for directional drilling counterweight pipes. Background Art

[0002] When implementing the common floating reduction measures in the directional drilling crossing technology in the trenchless field, since the large-diameter steel pipe will be subjected to the strong upward buoyancy of the mud or groundwater in the borehole during pipe dragging, a large frictional resistance will be generated due to being close to the upper wall of the borehole. According to the industry norms and empirical calculations, when the pipe diameter usually exceeds 914 mm, counterweights need to be added to the steel pipe. However, the metal counterweights are extremely easy to damage the inner coating of the pipe. Therefore, hollow pipes made of PE material are usually selected as counterweights. However, the self-weight load of the hollow PE pipes is small and is not sufficient to effectively reduce the buoyancy. Therefore, it is also necessary to fill water inside them to improve the counterweight effect. Since the PE counterweight pipes need to be quickly removed from the pipeline after the pipe dragging is completed, subsequent processes such as pushing water, pipe cleaning, pressure testing, and ventilation inside the pipeline can be carried out.

[0003] Currently, the traditional extraction processes usually include "hard pulling with water" and "pumping water first and then towing", and the specific operations are as follows: 1. Hard pulling with water method: After the pipe dragging is completed, an excavator is used on the ground to forcibly pull the PE pipe to the ground through a steel wire rope. Since the maximum traction force that the excavator can provide is only about 15 - 20 t, it is difficult to quickly pull out the PE pipe with a self-weight of hundreds of tons (up to about 400 t in large projects, and the frictional force will exceed 150 t) after being filled with water. Therefore, a water pump will be configured on the ground to assist, and the process will be cycled according to the sequence of pumping water → dragging → cutting → pumping water. This method takes a long time for operation, and in the initial stage, the pulling force of the excavator is large, and it is easy to tear the welded joint of the PE pipe welded by hot melting. Once the pipe breaks, it is difficult to salvage the PE counterweight pipe below the fracture at the site, which will seriously affect the subsequent construction progress. 2. Pumping water first and then towing: A rod with a relatively large stiffness (usually directly using a drill pipe on-site) is used to push the water pump into the PE counterweight pipe as much as possible. After minimizing the water level in the pipe to the greatest extent, an excavator is used for towing. Since the inner diameter of the commonly used PE pipe is only about 700 mm, it is difficult to smoothly push the water pump into the predetermined position under the conditions that the pipe body is bent and there is the influence of water buoyancy inside the pipe. Moreover, because the direction of the front end of the rod is not easy to control during the pushing process, it is easy to damage the drainage belt connected to the pump. Therefore, the effect of using this method is not ideal. Therefore, it is of great significance to provide a rapid extraction system and rapid extraction process for directional drilling counterweight pipes. Summary of the Invention

[0004] The object of the present invention is to solve at least one of the above-mentioned deficiencies existing in the prior art. For example, one object of the present invention is to provide a rapid extraction process for a directional drilling counterweight pipe that can achieve continuous pipe dragging operation, increase the buoyancy outside the counterweight pipe to be removed, and keep the dragging tension not too high. Another object of the present invention is to provide a rapid extraction system for a directional drilling counterweight pipe with a reasonable structure that can reduce the self-weight of the counterweight pipe to be removed and the traction tension during pipe dragging.

[0005] To achieve the above object, on the one hand, the present invention provides a rapid extraction process for a directional drilling counterweight pipe, and the process may include the following steps: driving a wooden plug into the end head of the counterweight pipe composed of several PE pipes; connecting one end of a steel wire rope to the wooden plug, threading the steel wire rope through the counterweight pipe, and hanging the other end on the flange at the head end of the counterweight pipe; applying sealing grease to the top of the tail end of the wooden plug; fixing a plate-shaped member with an opening on the surface to the flange at the head end of the counterweight pipe; passing a water injection pipe and an exhaust pipe through the plate-shaped member and installing them on the flange at the head end of the counterweight pipe; after filling the counterweight pipe with water, connecting the plate-shaped member to the cross-shaped bracket of the steel pipe towing head; pulling the steel wire rope to pull out the counterweight pipe, cutting off every 1 - 2 PE pipes pulled out, the wooden plug enters the PE pipe during the pipe dragging process, the water pressure breaks through the sealing grease to form a hole, and the water in the counterweight pipe continuously flows out; sleeving a steel wire rope on the outer wall of the PE pipe and pulling the steel wire rope to continue pulling out the counterweight pipe.

[0006] According to one or more exemplary embodiments of one aspect of the present invention, the wooden plug can be a wedge-shaped wooden plug, with a total length of 18 - 20 cm; the front end is pointed, the taper angle is 45 - 60°, the widest part of the taper tip is 11 - 15 cm, and the length of the taper tip is 5 - 8 cm; the width is wider at the front and narrower at the back, and the bottom width is 8 - 10 cm; a hole can be provided at the front end of the wooden plug to connect the steel wire rope.

[0007] According to one or more exemplary embodiments of one aspect of the present invention, the free end of the steel wire rope can pass through the hole provided in the wooden plug and be fixed by a rope clamp.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the length of the wooden plug driven into the PE pipe can be not less than 15 cm.

[0009] According to one or more exemplary embodiments of one aspect of the present invention, the sealing grease can be applied to a height higher than the surface of the end head.

[0010] According to one or more exemplary embodiments of one aspect of the present invention, the plate-shaped member can include an iron plate with a radius equal to that of the flange, and the plate-shaped member can be fixed to the flange by means of bolt connection.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, the plate-shaped member can be connected to the cross-shaped bracket of the steel pipe towing head through a U-shaped ring.

[0012] According to one or more exemplary embodiments of one aspect of the present invention, pulling out the counterweight pipe with a pulling steel wire rope may include using an excavator to pull the steel wire rope.

[0013] According to one or more exemplary embodiments of one aspect of the present invention, the end cap may include an end cap made of PE material, and the end cap can be hot melt welded to the tail end of the counterweight pipe; the flange may include a flange made of PE material, and the flange can be hot melt welded to the head end of the counterweight pipe; the counterweight pipe may include a counterweight pipe formed by hot melt welding a plurality of PE pipes.

[0014] Another aspect of the present invention provides a rapid extraction system for a directional drilling counterweight pipe. The system may include a counterweight pipe, a wooden plug, a steel wire rope, an end cap, a flange, a plate-shaped member, a water injection pipe, and an exhaust pipe. Among them, the counterweight pipe is located in the steel pipe, and the counterweight pipe is composed of a plurality of PE pipes; the end cap is arranged at the tail end of the counterweight pipe, the wooden plug is embedded in the end cap, and a part of it is located inside the counterweight pipe; sealing grease is smeared at the top of the tail end of the wooden plug; the flange is arranged at the head end of the counterweight pipe, the plate-shaped member is arranged on the side of the flange away from the counterweight pipe, the plate-shaped member is connected to the cross-shaped bracket of the steel pipe towing head, and an opening is provided on the surface of the plate-shaped member; the water injection pipe and the exhaust pipe pass through the opening of the plate-shaped member and the flange and extend into the counterweight pipe; the steel wire rope is located inside the counterweight pipe, one end of which is connected to the wooden plug, and the other end is suspended and fixed to the flange.

[0015] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0016] (1) The rapid extraction process of the directional drilling counterweight pipe proposed by the present invention can realize continuous pipe towing operation, increase the buoyancy outside the counterweight pipe to be taken out, and the available towing force will not be too high to cause cracking of the PE pipe.

[0017] (2) The structure of the rapid extraction system for the directional drilling counterweight pipe proposed by the present invention is reasonable. During the pipe towing operation, it can reduce the self-weight of the counterweight pipe to be taken out and reduce the traction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Through the following description in conjunction with the drawings, the above and other objects and features of the present invention will become clearer, wherein:

[0019] Figure 1 The structural schematic diagram of the rapid extraction system for the directional drilling counterweight pipe showing an exemplary embodiment of the present invention is shown;

[0020] Figure 2 The structural schematic diagram of the wooden plug embedded in the end cap showing an exemplary embodiment of the present invention is shown;

[0021] Figure 3 The structural schematic diagram of the wedge-shaped wooden plug showing an exemplary embodiment of the present invention is shown.

[0022] Reference Signs:

[0023] 1 - Steel pipe, 2 - Counterweight pipe, 3 - Wooden plug, 4 - Steel wire rope, 5 - Head, 6 - Flange, 7 - Water injection pipe, 8 - Exhaust pipe, 9 - Sealing grease, 10 - Wire clamp, 11 - Bolt, 12 - Hot melt weld joint. Specific implementation mode

[0024] In the following, a rapid extraction system and rapid extraction process for a directional drilling counterweight pipe of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0025] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "head", "first", "tail", "left", "right", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0026] The terms "first", "second", etc. are only for convenience of description and easy distinction, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0027] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] First exemplary embodiment

[0029] This exemplary embodiment provides a rapid extraction system for a directional drilling counterweight pipe.

[0030] Figure 1 The structural schematic diagram of the rapid extraction system for a directional drilling counterweight pipe according to an exemplary embodiment of the present invention is shown; Figure 2 The structural schematic diagram of the wooden plug embedded in the head according to an exemplary embodiment of the present invention is shown; Figure 3 The structural schematic diagram of the wedge-shaped wooden plug according to an exemplary embodiment of the present invention is shown. The following will be combined with Figures 1 to 3To describe the rapid extraction system for the directional drilling counterweight pipe of this exemplary embodiment. It should be noted that the front end / head end of the counterweight pipe described in the specification is the Figure 1 right direction of, and the tail end / rear end / bottom end of the counterweight pipe described in the specification is the Figure 1 left direction of.

[0031] As Figure 1 shown in, the rapid extraction system for the directional drilling counterweight pipe mainly includes a counterweight pipe 2, a wooden plug 3, a steel wire rope 4, a head 5, a flange 6, a plate-like member, a water injection pipe 7 and an exhaust pipe 8.

[0032] Among them, the counterweight pipe 2 is located in the steel pipe 1. The counterweight pipe 2 can be composed of several PE pipes welded by hot melting. There is a hot melt weld joint 12 between single PE pipes. The central channels of each PE pipe are connected and coaxially arranged. The head 5 can be hot melt welded to the tail end of the counterweight pipe. Here, the head can include a head made of PE material. The wooden plug 3 is embedded in the head 5. Its front end and tail end parts are located inside the counterweight pipe 2, and the tail end part is located in the head 5. Sealing grease 9 is smeared at the top of the tail end of the wooden plug 3. Here, the top of the tail end of the wooden plug refers to the concave part formed by the wooden plug embedded in the head, that is, the space formed by the outer surface of the tail end of the wooden plug and the inner wall of the concave part of the head. The flange 6 can be hot melt welded to the head end of the counterweight pipe 2. Here, the flange can include a flange made of PE material. The plate-like member is arranged on the right side of the flange. The plate-like member can be connected to the cross-shaped bracket of the steel pipe towing head through a U-shaped ring. An opening is provided on the surface of the plate-like member. The water injection pipe 7 and the exhaust pipe 8 pass through the opening of the plate-like member and the flange 6 and extend into the counterweight pipe 2. The steel wire rope 4 should be selected to have sufficient tensile force. The steel wire rope 4 is located inside the counterweight pipe 2. Its head end (free end) is connected to the wooden plug 3, and the tail end is suspended and fixed to the flange 6.

[0033] In this exemplary embodiment, as Figure 3 shown in, the wooden plug can be a wedge-shaped wooden plug. The total length of the wooden plug is 18 - 20 cm. The front end is pointed, the taper angle is 45 - 60°, the widest part of the taper tip is 11 - 15 cm, and the length of the taper tip is 5 - 8 cm. The width of the wooden plug is wider at the front and narrower at the rear, and the bottom width is 8 - 10 cm. A hole is provided at the front end of the wooden plug to connect the steel wire rope, and the diameter of the drilled hole / round hole is 2 - 3 cm. It should be noted that Figure 3 the unit of the data shown in is mm.

[0034] Furthermore, as Figure 1 shown in, the free end of the steel wire rope 4 can pass through the round hole on the wooden plug 3, and the free end of the steel wire rope 4 is fixed by a wire clip 10.

[0035] In this exemplary embodiment, as Figure 2 shown in, the length of the wooden plug 3 driven into the PE pipe can be not less than 15 cm, and the length of the embedded section of the wooden plug 3 stuck inside the head 5 can be adjusted according to the thickness of the head 5.

[0036] In this exemplary embodiment, the sealing grease can be applied to the recess to be higher than the surface of the end of the head, and its thickness can be 1 to 1.5 cm to prevent water leakage.

[0037] In this exemplary embodiment, the plate-shaped member can include an iron plate with a radius equal to that of the flange, as Figure 1 shown. The plate-shaped member can be fixedly connected to the flange 6 by bolts 11. Uniformly distributed circular holes can be provided on the surface of the flange where it is connected to the plate-shaped member for bolt connection.

[0038] In this exemplary embodiment, the directional drilling counterweight pipe rapid extraction system can further include an excavator, and the excavator is used to pull the steel wire rope to pull out the counterweight pipe.

[0039] Second Exemplary Embodiment

[0040] This exemplary embodiment provides a directional drilling counterweight pipe rapid extraction process.

[0041] The directional drilling counterweight pipe rapid extraction process can be implemented by the directional drilling counterweight pipe rapid extraction system described in the above first exemplary embodiment. The implementation process of the process can be as follows:

[0042] a) Use rods such as sufficiently long thin steel pipes and bamboo poles to pull the steel wire rope through the PE counterweight pipe to be welded, and then perform hot melt welding on the PE pipe. Then pull the steel wire rope through the next PE pipe and perform hot melt welding again. Repeat this process until the last PE pipe is to be welded.

[0043] b) Make a wedge-shaped wooden plug. The wooden plug is cylindrical as a whole, with a pointed front end. The total length is 18 to 20 cm, the taper angle is 45 to 60°, the length of the taper tip is 5 to 8 cm, the width of the bottom is 8 to 10 cm, and the widest part of the taper tip is 11 to 15 cm.

[0044] c) Manually use tools such as a hammer to drive the wooden plug into the head made of PE at the end. Ensure that after the front conical part completely enters, the total entry length is not less than 15 cm.

[0045] d) Pass the steel wire rope through the circular hole opened on the wooden plug, and fix the free end of the steel wire rope with a rope clamp.

[0046] e) Hot melt weld the head made of PE to the end of the PE pipe.

[0047] f) Apply sealing grease to the surface of the wooden plug until it is higher than the surface of the head. The thickness of the sealing grease is about 10 to 15 mm.

[0048] g) After the head end of the steel wire rope is fixedly suspended with the PE flange of the pipe head, then hot melt weld the latter to the PE pipe.

[0049] h) Fix a whole iron plate with a radius equal to that of the flange to the PE flange by means of bolt connection.

[0050] i) Open an opening on the surface of the iron plate to complete the installation of the water injection pipe and the exhaust pipe. Water is injected into the counterweight pipe to increase the self-weight of the pipe body, so as to achieve the purpose of counterweight and reduce the buoyancy of the external steel pipe. The water injection is actually carried out by the "drainage method". Since the specific gravity of water is greater than that of air, it enters from the lower water injection pipe, intending to discharge the air in the pipe from the upper exhaust pipe.

[0051] j) After the water injection is completed, connect the cross-shaped bracket of the iron plate and the steel pipe towing head through a U-shaped ring. This measure can prevent the counterweight pipe inside the steel pipe from shaking irregularly under the action of inertia during the pipe pulling process (the acting force of pipe pulling is applied to the external steel pipe), and avoid the situation that the head of the counterweight pipe is not at the head of the steel pipe after the pipe towing is completed (usually the total length of the counterweight pipe is less than the total length of the external steel pipe, so it may slide to the bottom of the steel pipe and cannot be towed subsequently), so it needs to be fixed.

[0052] k) After the pipe towing is completed, cut the head PE flange, and use an excavator to forcibly pull the steel wire rope to make the wooden plug enter the PE pipe. At this time, the water flow in the PE pipe relies on the water pressure to break through the sealing grease to form a hole, and the water can flow out of the PE pipe. Here, the flange and the iron plate can be regarded as a whole, that is, cutting the flange means cutting the flange and the iron plate. The rapid extraction process of the directional drilling counterweight pipe is applicable to the counterweight construction where the total length of the counterweight pipe is not greater than half of the total length of the crossing (so that the height of the head of the counterweight pipe is finally higher than the tail). In this way, after the pipe towing is completed, all the water in the pipe will gather at the tail. The total weight of the water in the counterweight pipe is usually more than 100t (which can be calculated according to the project scale), and the static water pressure converted to the sealing grease is also more than 20t, which can break through the ordinary sealing grease layer with a thickness of about 1 - 1.5 cm.

[0053] l) After the hole is formed, set a steel wire rope outside the PE pipe wall, and use an excavator to tow the steel wire rope. Relying on the friction between the steel wire rope and the pipe wall, take out the PE pipe outward. Cut it every 1 - 2 roots pulled out. Since there are holes at the bottom of the PE pipe, during the towing process, the water in the PE pipe will continuously flow out to achieve the purpose of reducing the pulling force when taking out the PE pipe.

[0054] In summary, the advantages proposed by the present invention include at least one of the following:

[0055] (1) The rapid extraction process of the directional drilling counterweight pipe proposed by the present invention can solve the problems that the pulling force is large during towing due to the inability to discharge the water in the PE counterweight pipe, and the output pulling force of the excavator is insufficient or the PE pipe cracks due to sudden pulling.

[0056] (2) The rapid extraction process of the directional drilling counterweight pipe proposed by the present invention can solve the problems in the prior art process that an additional water pump needs to be configured for pumping water, the operation is not continuous, and the interruption time is long.

[0057] (3) After the pipe dragging operation of the rapid extraction system for the directional drilling counterweight pipe proposed by the present invention is completed, the water in the counterweight pipe can be immediately released and allowed to fill the steel pipe. On the one hand, the self-weight of the counterweight pipe to be taken out can be reduced. On the other hand, the external buoyancy of the counterweight pipe can be increased, and the pulling force for pulling outwards can be reduced.

[0058] Although a rapid extraction system and a rapid extraction process for a directional drilling counterweight pipe of the present invention have been described above in combination with exemplary embodiments, those skilled in the art should clearly understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A rapid extraction process for a directional drilling counterweight pipe, characterized in that The process includes the following steps: Drive a wooden plug into the end head of a counterweight pipe composed of several PE pipes; Connect one end of a steel wire rope to the wooden plug, thread the steel wire rope through the counterweight pipe, and hang the other end on the flange at the head end of the counterweight pipe; Apply sealing grease to the top of the tail end of the wooden plug; Fix a plate-shaped part with an opening on its surface to the flange at the head end of the counterweight pipe; Pass a water injection pipe and an exhaust pipe through the plate-shaped part and install them on the head end of the counterweight pipe through the flange; After filling the counterweight pipe with water, connect the plate-shaped part to the cross-shaped bracket of the steel pipe towing head; Pull the steel wire rope to pull out the counterweight pipe. Cut off every 1 - 2 PE pipes pulled out. During the pipe towing process, the wooden plug enters the PE pipe, the water pressure breaks through the sealing grease to form a hole, and the water in the counterweight pipe continuously flows out; Put a steel wire rope on the outer wall of the PE pipe and continue to pull out the counterweight pipe by pulling the steel wire rope.

2. The rapid extraction process of the directional drilling counterweight pipe according to claim 1, characterized in that The wooden plug is a wedge-shaped wooden plug with a total length of 18 - 20 cm; the front end is pointed, the taper angle is 45 - 60°, the widest part of the taper tip is 11 - 15 cm, and the length of the taper tip is 5 - 8 cm; the width is wider at the front and narrower at the back, and the bottom width is 8 - 10 cm; there is a hole at the front end of the wooden plug to connect the steel wire rope.

3. The rapid extraction process of the directional drilling counterweight pipe according to claim 2, characterized in that, The free end of the steel wire rope passes through the hole provided on the wooden plug and is fixed by a rope clamp.

4. The rapid extraction process of the directional drilling counterweight pipe according to claim 2, characterized in that, The length of the wooden plug driven into the PE pipe is not less than 15 cm.

5. The rapid extraction process of the directional drilling counterweight pipe according to claim 1, characterized in that, The sealing grease is applied to be higher than the surface of the head end.

6. The rapid extraction process of the directional drilling counterweight pipe according to claim 1, characterized in that The plate-shaped part includes an iron plate with a radius equal to that of the flange, and the plate-shaped part is fixed to the flange by means of bolt connection.

7. The rapid extraction process of the directional drilling counterweight pipe according to claim 1, characterized in that, The plate-shaped part is connected to the cross-shaped bracket of the steel pipe towing head through a U-shaped ring.

8. The rapid extraction process of the directional drilling counterweight pipe according to claim 1, characterized in that, Pulling out the counterweight pipe by pulling the steel wire rope includes using an excavator to pull the steel wire rope.

9. The rapid extraction process of the directional drilling counterweight pipe according to claim 1, characterized in that, The head end includes a head end made of PE material, and the head end is heat-melt welded to the tail end of the counterweight pipe; the flange includes a flange made of PE material, and the flange is heat-melt welded to the head end of the counterweight pipe; the counterweight pipe includes a counterweight pipe formed by heat-melt welding several PE pipes.

10. A rapid extraction system for a directional drilling counterweight pipe, characterized in that, The system includes a counterweight pipe, a wooden plug, a steel wire rope, a head end, a flange, a plate-shaped part, a water injection pipe and an exhaust pipe. Among them, the counterweight pipe is located in the steel pipe and is composed of several PE pipes; the head end is arranged at the tail end of the counterweight pipe, the wooden plug is embedded in the head end, and a part of it is located inside the counterweight pipe; sealing grease is applied to the top of the tail end of the wooden plug; the flange is arranged at the head end of the counterweight pipe, the plate-shaped part is arranged on the side of the flange away from the counterweight pipe, the plate-shaped part is connected to the cross-shaped bracket of the steel pipe towing head, and there is an opening on the surface of the plate-shaped part; the water injection pipe and the exhaust pipe pass through the opening of the plate-shaped part and the flange and extend into the counterweight pipe; the steel wire rope is located inside the counterweight pipe, one end of it is connected to the wooden plug, and the other end is hung and fixed on the flange.

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