Pipe drawing device for pipeline construction

Abstract

The invention belongs to the technical field of pipeline laying, and particularly discloses a pipe drawing device for pipeline construction, which comprises a pipe body, a drill rod and a plurality of centralizers, the drill rod and the centralizers are arranged in the pipe body, the centralizers sleeve the drill rod, and a first pipe drawing head and a second pipe drawing head are respectively arranged at the left end and the right end of the drill rod; the first tube pulling head comprises a pulling lug plate, a first plugging piece and a first guiding piece which are sequentially connected from left to right, and a first mounting cavity which is formed in the first guiding piece in a penetrating mode in the axial direction is formed in the first guiding piece. According to the pipe drawing device for pipeline construction, the drill rod is arranged in the pipe body, the centralizer is arranged outside the drill rod, and the pipe drawing heads are arranged at the two ends of the drill rod correspondingly, so that the steps of guiding drilling, graded reaming and pipeline back dragging in the traditional pipeline construction process are simplified; the functions of guiding drilling, grading reaming and pipeline back dragging can be synchronously achieved, the pipeline construction workload is reduced, and the pipeline construction efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline laying, and in particular to a pipe pulling device for pipeline construction. Background Art

[0002] When laying underground pipelines for water, electricity, telecommunications, natural gas, coal gas, and oil, construction often requires excavation without excavating the surface. This trenchless laying technology primarily relies on horizontal directional drilling (HDD). Its core process involves first drilling a hole along a predetermined trajectory, then enlarging the hole to create a channel of sufficient size. Finally, a pipe pulling device (also known as a pipe pulling machine or pulling equipment) pulls the pipe or pipeline through this channel (also known as "pulling back"). This method is particularly suitable for sandy, clay, and gravelly soils and can be used in most non-hard rock areas in my country.

[0003] This construction technology has the following disadvantages: First, it uses multiple devices for construction, the process is cumbersome and the efficiency is low. The construction must strictly follow the steps of "guide drilling → graded hole expansion → pipe pulling back". The operation process is complicated, resulting in a long overall laying cycle and low construction efficiency. Second, the guide control deviation is easy to cause problems. During the hole expansion and pipe pulling back process, the soil around the hole is greatly disturbed, which not only easily causes ground subsidence, but may also cause the pipeline to deviate from the predetermined trajectory due to changes in soil resistance or guide control deviation.

[0004] In summary, the existing pipeline construction process has problems such as low construction efficiency and deviation in guidance control causing the pipeline to deviate from the predetermined trajectory. Summary of the Invention

[0005] The present invention provides a pipe pulling device for pipeline construction, which can solve the problems of low construction efficiency and deviation of the guide control causing the pipeline to deviate from the predetermined track in the pipeline construction process in the prior art.

[0006] A pipe pulling device for pipeline construction comprises a pipe body, a drill rod arranged in the pipe body, and a plurality of centralizers, wherein the centralizer is sleeved on the outside of the drill rod, and a first pipe pulling head and a second pipe pulling head are respectively provided at the left end and the right end of the drill rod; The first tube pulling head includes a pulling ear plate, a first blocking member, and a first guide member connected in sequence from left to right. The first guide member has a first installation cavity extending therethrough in the axial direction, and a first connecting pipe is provided in the first installation cavity. The second pipe pulling head includes a second guide member and a second sealing member arranged at the right end of the second guide member. The second guide member is arranged in the tube body. The second guide member has a second installation cavity arranged axially therethrough. A third installation cavity is opened on the second sealing member at the position corresponding to the second installation cavity. A drill rod guide tube is arranged in the third installation cavity. One end of the drill rod is connected to the first connecting tube, and the other end of the drill rod passes through the second installation cavity and the drill rod guide tube in sequence, and is provided with a back cap nut.

[0007] Furthermore, the outer circumferential surface of the first connecting pipe is uniformly distributed with first reinforcing ribs; The left end of the first reinforcing rib is connected to the first blocking piece.

[0008] Furthermore, the front side and the rear side of the pulling lug are both provided with second reinforcing ribs; The right end of the second reinforcing rib is connected to the first blocking member.

[0009] Furthermore, a pulling hole is provided on the front side of the pulling ear plate.

[0010] Furthermore, the outer diameter of the first blocking member is greater than the outer diameter of the first guiding member.

[0011] Furthermore, a mounting hole adapted to fit the first connecting pipe is provided on the right side of the first blocking member.

[0012] Furthermore, both ends of the drill rod are respectively fixed to the first connecting pipe and the back cap nut by threaded connection.

[0013] Furthermore, the number of the centralizers is no less than 2.

[0014] Furthermore, the centralizer includes a centralizing ring, which is sleeved on the outside of the drill pipe. The outer circumferential surface of the centralizing ring is evenly distributed with threaded locking holes, and locking bolts are provided in the threaded locking holes.

[0015] Furthermore, the number of the threaded locking holes is no less than 6.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a pipe pulling device for pipeline construction. By placing a drill rod inside a pipe body, arranging a centralizer outside the drill rod, and providing pipe pulling heads at both ends of the drill rod, the "guide drilling → staged hole expansion → pipe pulling back" steps in the traditional pipeline construction process are simplified. Through the pipe pulling device, the "guide drilling → staged hole expansion → pipe pulling back" functions can be simultaneously achieved, reducing the workload of pipeline construction and effectively improving pipeline construction efficiency.

[0017] 2. The use of a drill rod and centralizer in this invention significantly reduces the risk of ground subsidence. Unlike traditional pipeline construction, which involves separate, step-by-step reaming and pipe pulling back, which repeatedly disturbs the surrounding soil, this method utilizes synchronous advancement of the drill rod and pipe, ensuring precise matching of the reaming diameter with the pipe diameter (the centralizer ensures coaxiality). This allows for both hole formation and pipe placement in a single operation, minimizing secondary soil disturbance. This not only fundamentally reduces the risk of ground subsidence but also, through the guiding and restraining effect of the rigid drill rod, significantly improves the accuracy of pipeline placement along the predetermined trajectory, preventing derailment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A cross-sectional view of the structure of a pipe pulling device for pipeline construction provided by the present invention; Figure 2 A structural front view of a first pipe drawing head of a pipe drawing device for pipeline construction provided by the present invention; Figure 3 A schematic structural diagram of a second pipe drawing head of a pipe drawing device for pipeline construction provided by the present invention; Figure 4 A structural cross-sectional view of a centralizer of a pipe pulling device for pipeline construction provided by the present invention; Figure 5 This is a left side view of the structure of a centralizer of a pipe pulling device for pipeline construction provided by the present invention.

[0019] Explanation of the accompanying drawings: 1. Tube body; 2. First pulling head; 3. Drill rod; 4. Stabilizer; 5. Second pulling head; 6. Back cap nut; 21. Pulling ear plate; 23. First blocking member; 25. First guide member; 26. First connecting pipe; 211. Second reinforcing rib; 212. Pulling hole; 231. Mounting hole; 251. First mounting cavity; 261. First reinforcing rib; 41. Stabilizing ring; 42. Threaded locking hole; 43. Locking bolt; 51. Second guide member; 52. Second blocking member; 53. Second mounting cavity; 54. Third mounting cavity; 55. Drill rod guide tube; 551. Third reinforcing rib. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0021] like Figures 1 to 5As shown, the present invention provides a pipe pulling device for pipeline construction, comprising a pipe body 1, a drill rod 3 disposed in the pipe body 1, and a plurality of centralizers 4. The centralizers 4 are sleeved on the outside of the drill rod 3. The left and right ends of the drill rod 3 are respectively provided with a first pipe pulling head 2 and a second pipe pulling head 5. The first tube pulling head 2 includes a pulling ear plate 21, a first blocking member 23, and a first guide member 25 connected in sequence from left to right. The first guide member 25 has a first installation cavity 251 extending therethrough in the axial direction. A first connecting pipe 26 is provided in the first installation cavity 251. In the first tube pulling head 2, the pulling ear plate 21 is used to connect to the drill bit of the drilling rig. The right end of the pulling ear plate 21 is connected to the first blocking piece 23. The right end of the first blocking piece 23 is connected to the first guide piece 25. The first guide piece 25 is adaptively placed in the tube body 1, thereby ensuring a tight connection between the first tube pulling head 2 and the tube body 1. The second pipe pulling head 5 includes a second guide member 51 and a second blocking member 52 provided at the right end of the second guide member 51. The second guide member 51 is provided in the pipe body 1. The second guide member 51 has a second mounting cavity 53 extending therethrough in the axial direction. The second blocking member 52 has a third mounting cavity 54 formed at a position corresponding to the second mounting cavity 53. A drill rod guide tube 55 is provided in the third mounting cavity 54. One end of the drill rod 3 is connected to the first connecting tube 26. The other end of the drill rod 3 passes through the second mounting cavity 53 and the drill rod guide tube 55 in sequence and is provided with a back cap nut 6. In the second pipe pulling head 5, the second guide member 51 can be adaptively placed in the pipe body 1, thereby ensuring a tight connection between the second pipe pulling head 5 and the pipe body 1. The right end of the second guide member 51 is connected to the second blocking member 52, and the left end of the drill rod guide tube 55 is located in the third installation cavity 54 of the second blocking member 52. One end of the drill rod 3 is connected to the first connecting pipe 26, and the other end of the drill rod 3 passes through the second installation cavity 53 and the drill rod guide tube 55 in sequence, and is provided with a back cap nut 6; the front end of the drill rod 3 is connected to the first connecting pipe 26 to realize mud injection, and the rear end of the drill rod 3 passes through the second installation cavity 53 and the drill rod guide tube 55 in sequence, and the end is locked by the back cap nut 6 to form a closed force transmission channel; and a stabilizer 4 is set on the outside of the drill rod 3 to synchronously constrain the movement trajectory of the drill rod 3 and the pipe body 1.

[0022] In the pipe pulling device for pipeline construction, the pipe body 1 is provided with a drill pipe 3 and a plurality of centralizers 4. The centralizers 4 are sleeved on the outside of the drill pipe 3, and the left and right ends of the drill pipe 3 are respectively provided with a first pipe pulling head 2 and a second pipe pulling head 5. The first pipe pulling head 2 is the front pipe pulling head, and the second pipe pulling head 5 is the rear pipe pulling head. Specifically, the working process of the pipe pulling device for pipeline construction is as follows: Step 1: Assembly and initial positioning of the pipe pulling device for pipeline construction Insert the drill rod 3 into the pipe body 1 to be laid. This drill rod 3 is marked as drill rod 1, and this pipe body 1 is marked as pipe body 1. A centralizer 4 (which has both guiding and centering functions) is installed at intervals outside the drill rod 3. The front end of the drill rod 3 is connected to the pilot drill bit via a front pull head (i.e., first pull head 2). The rear end is provided with a rear pull head (i.e., second pull head 5) to guide the end of the drill rod 3 and connect to the traction power system. Position the entire machine at the construction starting point, and adjust the coaxiality of the drill rod 3 and the pipe body 1 (the centralizer 4 ensures that the pipe body 1 is aligned with the drilling trajectory). Step 2: Synchronous drilling-reaming-pullback stage Pilot drilling: The traction power system pushes the drill pipe 3 forward, and the front-pull pipe head drives the pilot drill bit to cut the formation, forming an initial pilot hole. Mud circulation and chip removal: High-pressure mud is injected into the drill pipe 3 from the front-pull pipe head, carrying the drill cuttings and discharged from the rear-pull pipe head to maintain the stability of the hole. Staged hole expansion and synchronous pipeline insertion: The pipeline is simultaneously inserted into the pilot hole under the traction of the drill pipe (the rear-pull pipe head continuously provides backhaul force). Step 3: Continue to push until the end of tube 1 The drill rod 3 and the pipe body 1 are advanced together at a constant speed until they reach the end of the pipe body 1; Step 4: Continuous laying of pipes Prepare another pipe body 1, marked as pipe body 2#, connect the 2# drill pipe to the tail of the 1# drill pipe, and also set the centralizer 4 on the 2# drill pipe. Remove the back-pull pipe head on the 1# pipe body, and connect the front end of the 2# pipe body to the tail of the 1# pipe body. Set the back-pull pipe head on the tail of the 2# pipe body and connect the back-pull pipe head to the 2# drill pipe. After all connections are completed, repeat steps 1-3 to complete the laying of the 2# pipeline. Step 5: Complete pipeline laying Repeat step 4 until the pipe is laid to the preset length, completing the pipe laying.

[0023] Traditional construction requires the sequential deployment of multiple pieces of equipment, including a drill rig, reamer, and pipe puller. This pipe pulling device for pipeline construction integrates drilling, reaming, and pulling functions into a single device, achieving "multi-tasking in one machine." This significantly simplifies on-site equipment scheduling and process integration, reducing construction management complexity and equipment investment costs. This innovative structure breaks the inherent construction logic of "drilling a hole first, then laying pipe." By utilizing a synchronized drill and pipe movement mechanism, this device compresses the traditional three-stage discrete operation into a single, continuous process. This improves efficiency while ensuring construction quality (controlling settlement and maintaining a stable trajectory) and reducing overall costs, offering a disruptive solution for trenchless construction of urban underground pipeline networks.

[0024] like Figures 1 to 5 As shown, in some embodiments of the present invention, the outer circumferential surface of the first connecting pipe 26 is uniformly distributed with first reinforcing ribs 261; The left end of the first reinforcing rib 261 is connected to the first blocking member 23; In the first tube pulling head 2, the pulling lug 21 is used to connect to the drill bit of the drilling rig. The right end of the pulling lug 21 is connected to the first blocking member 23. The right end of the first blocking member 23 is connected to the first guide member 25. The first guide member 25 is adaptively placed in the tube body 1 to ensure a tight connection between the first tube pulling head 2 and the tube body 1. Therefore, the first reinforcing rib 261 is provided, which has the following advantages: First, to enhance structural strength and load transfer capacity, first reinforcing ribs 261 are evenly distributed along the outer circumference of the first connecting pipe 26, with their left ends directly connected to the first blocking piece 23. This structural design effectively enhances the rigidity and strength of the first connecting pipe 26, enabling it to better withstand the axial tension, vibration, and torsional loads transmitted by the drilling rig via the pull lugs 21. Furthermore, the ribs, acting as a direct force transmission path, significantly improve the efficiency and reliability of load transfer (particularly tension) from the first blocking piece 23 to the first connecting pipe 26, preventing excessive stress concentration at the connection. Secondly, the connecting tube's resistance to deformation and stability is enhanced: the circumferentially evenly distributed first reinforcing ribs 261 significantly enhance the first connecting tube's 26's ability to resist radial extrusion and bending deformation. When the first guide member 25 is adaptively positioned within the tube body 1 and subjected to the restraining force of the tube body or lateral forces during operation, the reinforcing ribs effectively prevent the first connecting tube 26 from localized collapse or instability, ensuring the overall structural stability of the connection between the first tube drawing head 2 and the tube body 1. Third, it ensures guiding accuracy and tight connection: By increasing the rigidity and deformation resistance of the first connecting tube 26, the first reinforcing rib 261 indirectly ensures the positioning accuracy and guiding function of the first guide member 25 within the tube body 1. The connecting tube's resistance to deformation means that the first guide member 25 can more stably maintain its adaptability to the inner wall of the tube body 1, thereby more reliably achieving a tight connection between the first pulling head 2 and the tube body 1, preventing loosening or deviation.

[0025] like Figures 1 to 5 As shown, in some embodiments of the present invention, the front side and the rear side of the pulling ear plate 21 are both provided with a second reinforcing rib 211; The right end of the second reinforcing rib 211 is connected to the first blocking member 23; The second reinforcing rib 211 is provided to significantly enhance the structural strength, rigidity and stability of the pulling ear plate 21, thereby ensuring an efficient and reliable load transfer path, thereby effectively supporting the structural functions of the entire first pulling pipe head 2 (especially the connection tightness with the drilling rig and the guiding accuracy), and improving the durability and reliability of the equipment in drilling operations.

[0026] like Figures 1 to 5As shown, in some embodiments of the present invention, the outer circumferential surface of the drill rod guide tube 55 is uniformly distributed with third reinforcing ribs 551 , and the left end of the third reinforcing rib 551 is connected to the second blocking member 52 ; A third reinforcing rib 551 is provided, and the third reinforcing rib 551 is evenly distributed on the outer circumferential surface of the drill rod guide tube 55, effectively improving the structural strength and load transfer capacity of the drill rod guide tube 55 and the second sealing member 52, and improving the anti-deformation ability and stability of the drill rod guide tube 55, thereby ensuring the guiding accuracy and connection tightness.

[0027] like Figures 1 to 5 As shown, in some embodiments of the present invention, a pulling hole 212 is opened on the front side of the pulling ear plate 21; The design of the pull hole 212 directly provides a standardized mechanical connection point with the drill bit. This design allows the pulling force of the drill bit to be efficiently transmitted to the first pull head 2 through a connecting member such as a hole shaft, pin, or hook, significantly simplifying the assembly process and ensuring a clear and reliable power transmission path.

[0028] like Figures 1 to 5 As shown, in some embodiments of the present invention, the outer diameter of the first blocking member 23 is greater than the outer diameter of the first guide member 25; and the outer diameter of the first blocking member 23 is greater than the inner diameter of the tube body 1; With this arrangement, the first guide member 25 is adaptively placed within the tube body 1, connecting and guiding the tube body 1, while the first blocking member 23 forms a mechanical axial stop. Specifically, when the first guide member 25 is inserted into the tube body 1 to the designed depth, the right end face of the blocking member 23 rigidly abuts against the end of the tube body 1, completely preventing deformation of the tube body or jamming of the guide member due to over-insertion of the pull tube head 2. Under abnormally high tension conditions of the drilling rig, the end face contact structure directly bears the overload, protecting the first guide member 25 and the inner wall of the pipe body 1 from being squeezed and damaged, thereby improving the system's overload resistance.

[0029] like Figures 1 to 5 As shown, in some embodiments of the present invention, a mounting hole 231 adapted to the first connecting pipe 26 is provided on the right side of the first blocking member 23 ; the setting of the mounting hole 231 facilitates the connection between the first connecting pipe 26 and the first blocking member 23 .

[0030] like Figures 1 to 5 As shown, in some embodiments of the present invention, both ends of the drill rod 3 are respectively fixed to the first connecting pipe 26 and the back cap nut 6 by threaded connection; Specifically, both ends of the drill rod 3 are respectively fixed to the first connecting pipe 26 and the back nut 6 by threaded connection, which makes it easy to disassemble or install the drill rod 3.

[0031] like Figures 1 to 5As shown, in some embodiments of the present invention, the number of centralizers 4 is not less than 2; The number of the centralizers 4 can be set according to the length of the drill rod 3. Generally, the drill rod 3 is long, and multiple centralizers 4 are set. The multiple centralizers work together to better play a guiding role.

[0032] like Figures 1 to 5 As shown, in some embodiments of the present invention, the centralizer 4 includes a centralizing ring 41, which is sleeved on the outside of the drill pipe 3. The outer circumferential surface of the centralizing ring 41 is uniformly distributed with threaded locking holes 42, and locking bolts 43 are provided in the threaded locking holes 42; The structural design of the centralizer 4 can realize an adjustable locking mechanism and a bidirectional guiding function. Specifically, the evenly distributed threaded locking holes 42 + adjustable locking bolts 43 constitute a radial pressure fine-tuning system. And because the centralizer 4 is arranged in the pipe body 1 and is sleeved on the outside of the drill pipe 3, the centralizer can avoid eccentric wear or vibration instability of the drill pipe 3, and significantly improve the trajectory accuracy of ultra-deep hole / complex formation drilling.

[0033] like Figures 1 to 5 As shown, in some embodiments of the present invention, the number of threaded locking holes 42 is not less than 6; A plurality of threaded locking holes 42 are provided and the position of the locking bolts 43 is optimized to prevent excessive local structural pressure from causing structural fracture and avoid accidents caused by sudden stress changes.

[0034] The present invention provides a pipe pulling device for pipeline construction. By arranging a drill rod in a pipe body, arranging a centralizer on the outside of the drill rod, and arranging pipe pulling heads at both ends of the drill rod, the "guide drilling → graded hole expansion → pipeline pulling back" steps in the traditional pipeline construction process are simplified. Through the pipe pulling device, the "guide drilling → graded hole expansion → pipeline pulling back" functions can be realized simultaneously, reducing the workload of pipeline construction and effectively improving the efficiency of pipeline construction. In addition, the pipe pulling device can also be used alone for steps such as guide drilling, graded hole expansion, and pipeline pulling back, and has wide applicability.

[0035] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A pipe pulling device for pipeline construction, characterized in that: It comprises a pipe body (1), a drill rod (3) and a plurality of centralizers (4) arranged in the pipe body (1), wherein the centralizer (4) is sleeved on the outside of the drill rod (3), and the left end and the right end of the drill rod (3) are respectively provided with a first pipe pulling head (2) and a second pipe pulling head (5); The first tube pulling head (2) comprises a pulling ear plate (21), a first blocking member (23) and a first guide member (25) connected in sequence from left to right. The first guide member (25) has a first installation cavity (251) extending through the first installation cavity (251) in the axial direction. A first connecting pipe (26) is provided in the first installation cavity (251). The second tube pulling head (5) includes a second guide member (51) and a second blocking member (52) provided at the right end of the second guide member (51). The second guide member (51) is provided in the tube body (1). The second guide member (51) has a second installation cavity (53) provided therein and extending axially therethrough. A third installation cavity (54) is provided on the second blocking member (52) at a position corresponding to the second installation cavity (53). A drill rod guide tube (55) is provided in the third installation cavity (54). One end of the drill rod (3) is connected to the first connecting tube (26). The other end of the drill rod (3) passes through the second installation cavity (53) and the drill rod guide tube (55) in sequence and is provided with a back cap nut (6).

2. A pipe pulling device for pipeline construction according to claim 1, characterized in that: The outer circumferential surface of the first connecting pipe (26) is uniformly distributed with first reinforcing ribs (261); The left end of the first reinforcing rib (261) is connected to the first blocking piece (23).

3. A pipe pulling device for pipeline construction according to claim 1, characterized in that: The front side and the rear side of the pulling ear plate (21) are both provided with second reinforcing ribs (211); The right end of the second reinforcing rib (211) is connected to the first blocking member (23).

4. A pipe pulling device for pipeline construction according to claim 1, characterized in that: A pulling hole (212) is provided on the front side of the pulling ear plate (21).

5. The pipe pulling device for pipeline construction according to claim 1, characterized in that: The outer diameter of the first blocking member (23) is greater than the outer diameter of the first guiding member (25).

6. The pipe pulling device for pipeline construction according to claim 1, characterized in that: A mounting hole (231) adapted to the first connecting pipe (26) is provided on the right side of the first blocking member (23).

7. The pipe pulling device for pipeline construction according to claim 1, characterized in that: The two ends of the drill rod (3) are respectively fixed to the first connecting pipe (26) and the back cap nut (6) by means of threaded connection.

8. The pipe pulling device for pipeline construction according to claim 1, characterized in that: The number of the centralizers (4) is no less than 2.

9. The pipe pulling device for pipeline construction according to claim 1, characterized in that: The centralizer (4) comprises a centralizing ring (41), which is sleeved on the outside of the drill pipe (3). The outer circumferential surface of the centralizing ring (41) is uniformly provided with threaded locking holes (42), and locking bolts (43) are provided in the threaded locking holes (42).

10. The pipe pulling device for pipeline construction according to claim 9, characterized in that: The number of the threaded locking holes (42) is no less than 6.

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