Dragging pipe construction method
By using hole reinforcement units and anti-collapse parts in the construction of the drag pipe, the problem of soil collapse during the reaming process is solved, the reinforcement of the inner wall of the hole and the smooth progress of pipeline installation is achieved, and the stability and safety of construction are improved.
Patent Information
- Application Number
- CN202411385095.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-24
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During the construction of drag tubes, too much lubricant used during the reaming process leads to excessive moisture content in the soil, which can easily cause the problem of channel collapse.
The channel reinforcement unit is adopted, including a connecting rod, shell and filter. The channel reinforcement unit is connected at the rear end of the reamer to strengthen the inner wall of the hole, and the mud is treated through the permeable slot hole and filter, so that it loses water and becomes viscous liquid. Apply to the inner wall of the hole to increase strength while using a collapsing piece to fill the space between the pipe and the reamer to prevent collapse.
Effectively prevent hole collapse, ensure the smooth progress of hole reamer and pipeline installation, reduce the risk of hole reamer stuck and pipeline stuck in the hole, and improve the strength of the hole inner wall, prevent the impact of collapse on pipeline dragging .
Smart Images
Figure CN119177822A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of trenchless drag pipe construction, and in particular to a drag pipe construction method. Background Art
[0002] Drag pipe construction is a trenchless construction technology that refers to the use of various rock and soil drilling equipment and technical means to lay, replace and repair various underground pipelines through guiding and directional drilling, etc., while excavating a very small part of the surface. It has the advantages of not easily damaging green spaces and vegetation, and not easily affecting normal life and work order.
[0003] Generally, the construction of drag pipe requires first drilling a guide hole, then expanding the guide hole, and finally placing the pipe. However, in the process of expanding the hole, liquid media such as water are usually used as lubrication to facilitate cutting of the soil. However, if too much lubricant is used, the water content of the soil will be too high, making it easy for the hole to collapse.
[0004] In view of this, a towing pipe construction method is needed. Summary of the invention
[0005] In order to improve the problem of easy collapse of the hole during hole expansion and overshoot, the present application provides a dragging pipe construction method.
[0006] The present application provides a drag pipe construction method, which adopts the following technical solution: A drag pipe construction method, comprising the following steps: Excavation of foundation pit: excavate a foundation pit at each end of the pipeline burial location, one of the two foundation pits is a working pit and the other is a receiving pit; Guided drilling: using a horizontal directional drilling rig to drive the drill bit to drill from the working pit to the receiving pit; Pre-reaming: using the horizontal directional drilling rig to drive the reamer to reame from the receiving pit to the working pit, and a hole reinforcement unit is connected to the end of the reamer facing the receiving pit, so as to reinforce the inner wall of the hole through the hole reinforcement unit; Hole expansion and pipe pulling: the horizontal directional drilling rig is used to drive the pipeline from the receiving pit to the working pit until the end of the pipeline connected to the hole expander passes through the working pit.
[0007] By adopting the above technical solution, during the hole expansion process, a hole reinforcement unit is connected to the rear end of the hole expander to reinforce the inner wall of the hole widened by the hole expander, thereby effectively preventing the hole from collapsing, so as to facilitate further hole expansion or installation of pipes in the hole. It is less likely that the hole expander will not move smoothly or even get stuck in the hole during subsequent hole expansion, or that the pipe will get stuck in the hole when pulling the pipe.
[0008] Furthermore, the channel reinforcement unit includes a connecting rod, a shell and a filter, one end of the connecting rod is connected to the reamer, the other end of the connecting rod is suitable for connecting to a drill pipe, the end of the shell facing the reamer is connected to the connecting rod, the end of the shell facing away from the reamer is provided with an opening, the filter is provided on the inner wall of the shell, and the shell is provided with a plurality of water-permeable slots, the mud generated during the operation of the reamer can pass through the water-permeable slots and the filter in sequence and flow from the opening to the widened pipe, or the mud can flow from the outer wall of the shell and the inner wall of the channel being widened to the widened pipe.
[0009] By adopting the above technical solution, when the mud generated during the hole expansion passes through the water-permeable groove holes and the filter and flows from the opening to the widened pipe, the water in the mud will be filtered by the filter to flow out from the widened pipe. Therefore, the mud between the outer wall of the shell and the inner wall of the hole will lose water and become viscous, and the viscous mud can be smeared on the inner wall of the hole through the outer wall of the shell, so that the surface layer of the inner wall of the hole has higher strength and is not easy to collapse.
[0010] Furthermore, the diameter of the shell gradually increases in a direction from close to the reamer to far away from the reamer.
[0011] By adopting the above technical solution, since there is a bent area in the channel, the shape of the shell can more easily achieve reversal at the area where the channel turns and bends, is not easy to get stuck in the channel, and is not easy to damage the shape of the channel turning and bending.
[0012] Furthermore, the connecting rod is connected to the reamer and can rotate with the reamer, and the outer shell includes a plurality of spliced plates that are evenly spaced around the circumference of the connecting rod and extend along the axial direction of the connecting rod, and the water-permeable slots are formed between adjacent spliced plates.
[0013] By adopting the above technical solution, the shell can smear the dehydrated and relatively viscous mud onto the inner wall of the hole through the splicing plate during rotation, so that the surface layer of the inner wall of the hole has higher strength and is less likely to collapse.
[0014] Further, each of the split plates extends from one side along the length direction to the other side along the length direction in a direction away from the axis of the connecting rod, the direction from the side away from the axis of the connecting rod to the side close to the axis of the connecting rod is the rotation direction of the reamer, and the water-permeable groove hole is formed between the side of each of the split plates away from the axis of the connecting rod and the side of the adjacent split plates close to the axis of the connecting rod.
[0015] By adopting the above technical scheme, on the one hand, the area of the water-permeable groove holes can be increased, so that the water filtering effect is better, thereby making the mud more viscous, thereby improving the supporting effect on the inner wall of the channel, and making the filter less likely to contact with the channel, thereby making the filter less likely to be damaged.
[0016] Further, one end of each of the split plates close to the reamer is hinged to the connecting rod, one end of each of the split plates away from the reamer can be close to or away from the connecting rod, and one end of each of the split plates away from the reamer is provided with a limit rod; The connecting rod is provided with a plurality of sleeves which are arranged at equal intervals along the axial direction of the connecting rod. The number of the sleeves is consistent with the number of the limiting rods and corresponds one-to-one to the limiting rods. A spring is provided in each of the sleeves. The limiting rod can be inserted into the sleeve and connected to the spring.
[0017] By adopting the above technical solution, the diameter of the channel reinforcement unit can be changed, so that when encountering stones during the hole expansion process, the end of the splicing plate away from the hole expander can be deflected in the direction close to the connecting rod, thereby avoiding the stones and making it less likely for the channel reinforcement unit to be stuck in the channel.
[0018] Furthermore, the connecting rod is connected to the reamer, and the connecting rod does not rotate with the reamer, and the outer shell includes a plurality of ring plates arranged along the axial direction of the connecting rod, and the diameter of the ring plates gradually increases from close to the reamer to away from the reamer, and the water-permeable slots are formed between adjacent ring plates, and the water-permeable slots are perpendicular to the axial direction of the connecting rod.
[0019] By adopting the above technical scheme, the area of the water-permeable groove holes can be increased, and step-by-step water filtration can be achieved, so that the water content of the mud is lower and the viscosity is higher, and the viscous mud can be smeared on the inner wall of the channel through the outer wall of the outer shell, so that the surface layer of the inner wall of the channel has higher strength and is not prone to collapse.
[0020] Furthermore, in a direction from the ring plate away from the reamer to the direction close to the reamer, the small diameter end of the ring plate is inserted into the large diameter end of the adjacent ring plate.
[0021] By adopting the above technical solution, more water-permeable slots can be formed on the outer shell, thereby increasing the area of the water-permeable slots, so that the water content of the mud is lower and the viscosity is higher, so that the support capacity of the inner wall of the channel is stronger and less likely to collapse, and the filter screen is less likely to contact the channel, so that the filter screen is less likely to be damaged.
[0022] Furthermore, in the reaming and pipe pulling step, the pipe is connected to the reamer via a connector, the connector includes an inner connecting piece and a plurality of outer connecting pieces, the inner connecting piece can be inserted into the pipe, and a sealing piece is provided between the outer wall of the inner connecting piece and the inner wall of the pipe, a threaded hole is also provided on the outer wall of the inner connecting piece, a positioning hole matching the threaded hole is provided on the pipe, a plurality of the outer connecting pieces are arranged around the circumference of the pipe, and a through hole is provided on the outer connecting piece, and bolts can sequentially pass through the through hole, the sealing piece and the positioning hole to connect with the threaded hole.
[0023] By adopting the above technical solution, a sealed connection between the pipeline and the connector can be achieved.
[0024] Furthermore, the connector also includes an anti-collapse part, which includes a plurality of enclosure plates, the external connecting part includes a large diameter section and a small diameter section, the pipe is connected to the large diameter section, the plurality of enclosure plates are arranged around the circumference of the small diameter section and are screwed with the small diameter section, and the plurality of enclosure plates can enclose a truncated cone-shaped cylindrical structure, the end of the cylindrical structure close to the reamer is a small-mouth end, and the end of the cylindrical structure away from the reamer is a large-mouth end, a clearance is formed between the small-mouth end and the reamer, the diameter of the large-mouth end is consistent with the diameter of the pipe, and the ratio of the diameter of the small-mouth end to the diameter of the large-mouth end is greater than or equal to 0.8 and less than 1.
[0025] By adopting the above technical scheme, the space between the pipeline and the reamer can be filled by the anti-collapse part, so that the hole after the hole is expanded by the reamer can be promptly filled and supported by the anti-collapse part, thereby effectively preventing the collapse of the hole from affecting the dragging of the pipeline, and the shape of the anti-collapse part can more easily achieve reversal in the area where the hole turns and bends, and it is not easy to get stuck in the hole, and it is not easy to damage the shape of the turning and bending part of the hole.
[0026] In summary, the present application includes at least one of the following beneficial effects: 1. During the hole expansion process, a hole reinforcement unit is connected to the rear end of the hole expander to reinforce the inner wall of the hole expanded by the hole expander, thereby effectively preventing the hole from collapsing, so as to facilitate further hole expansion or installation of pipes in the hole. It is not easy for the hole expander to move smoothly or even get stuck in the hole during subsequent hole expansion, or for the pipe to get stuck in the hole when pulling the pipe; 2. When the mud generated during the hole expansion passes through the water-permeable slots and the filter screen and flows from the opening to the widened pipe, the water in the mud will be filtered by the filter screen to flow out of the widened pipe. Therefore, the mud between the outer wall of the shell and the inner wall of the hole will lose water and become viscous, and the viscous mud can be smeared on the inner wall of the hole through the outer wall of the shell, so that the surface layer of the inner wall of the hole has higher strength and is not easy to collapse; 3. In the process of expanding the hole and pulling the pipe, the space between the pipe and the reamer can be filled by the anti-collapse piece, so that the hole expanded by the reamer can be promptly filled and supported by the anti-collapse piece, thereby effectively preventing the collapse of the hole from affecting the dragging of the pipe, and the shape of the anti-collapse piece can more easily achieve reversal in the area where the hole turns and bends, and it is not easy to get stuck in the hole, and it is not easy to damage the shape of the turning and bending part of the hole. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a stereogram of a first embodiment of a channel reinforcement unit in a drag pipe construction method of the present application; Figure 2 It is a structural schematic diagram of the connection between the reamer and the pipeline in a dragging pipe construction method of the present application; Figure 3 It is a bottom view of a first embodiment of a channel reinforcement unit in a drag pipe construction method of the present application; Figure 4 It is a partial cross-sectional view of a first embodiment of a channel reinforcement unit in a dragging pipe construction method of the present application, cut along the axial direction of a connecting rod; Figure 5 yes Figure 4 A magnified image of area A; Figure 6 It is a stereogram of a second embodiment of a channel reinforcement unit in a drag pipe construction method of the present application; Figure 7 It is a partial cross-sectional view of a second embodiment of a channel reinforcement unit in a dragging pipe construction method of the present application, cut along the axial direction of a connecting rod; Figure 8 is along Figure 7 Schematic diagram of the local structure of the pipeline after axial sectioning.
[0028] Explanation of the reference numerals: 1. reamer; 2. hole reinforcement unit; 21. connecting rod; 211. sleeve; 2111. spring; 22. housing; 221. water-permeable slot; 222. spliced plate; 2221. limit rod; 223. ring plate; 23. filter screen; 3. pipeline; 4. seal; 5. connector; 51. inner connecting piece; 52. outer connecting piece; 53. anti-collapse piece. DETAILED DESCRIPTION
[0029] Figure 1 This is a stereogram of a first embodiment of a channel reinforcement unit in a drag pipe construction method of the present application. Figure 2 This is a schematic diagram of the structure of the connection between the reamer and the pipeline in a dragging pipe construction method of the present application, see Figure 1 and Figure 2 The present application provides a method for constructing a dragging pipe, comprising the following steps: Excavation of foundation pit: a foundation pit is excavated at each end of the buried position of pipeline 3, one of the two foundation pits is the working pit and the other is the receiving pit.
[0030] Guided drilling: Connect the drill bit to the drill rod, and connect the drill rod to the horizontal directional drilling rig, and then use the horizontal directional drilling rig to drive the drill rod to drive the drill bit from the working pit to the receiving pit.
[0031] Pre-reaming: After the drill bit enters the receiving pit, the drill bit is removed, and the reamer 1 is connected to the drill rod. Then, the horizontal directional drilling rig is used to drive the drill rod to drive the reamer 1 to drill into the working pit for reaming, and a channel reinforcement unit 2 is connected to the end of the reamer 1 facing the receiving pit to reinforce the inner wall of the channel through the channel reinforcement unit 2. In addition, a drill rod can be connected to the rear of the channel reinforcement unit 2, so that after the reamer 1 and the channel reinforcement unit 2 enter the working pit, the larger reamer 1 can be connected to the drill rod in the receiving pit, so as to facilitate further reaming. During the hole expansion process, a hole reinforcement unit 2 is connected to the rear end of the hole expander 1 to reinforce the inner wall of the hole widened by the hole expander 1, thereby effectively preventing the hole from collapsing, so as to facilitate further hole expansion or installation of the pipe 3 in the hole. It is not easy for the hole expander 1 to move smoothly or even get stuck in the hole during subsequent hole expansion, or for the pipe 3 to get stuck in the hole when pulling the pipe.
[0032] Hole expansion and pipe pulling: During the last hole expansion, a horizontal directional drilling rig is used to drive the reamer 1 and the pipe 3 to move from the receiving pit to the working pit until the end of the pipe 3 connected to the reamer 1 passes through the working pit, thereby realizing the burial of the pipe 3. Of course, it should be noted that if the diameter of the buried pipe 3 is small, the hole expansion and pipe pulling steps can be carried out directly, and the hole expansion and pipe pulling can be completed in one go.
[0033] Figure 3 This is a bottom view of the first embodiment of the channel reinforcement unit in the drag pipe construction method of the present application, see Figure 1 and Figure 3Specifically, the channel reinforcement unit 2 can be configured to include a connecting rod 21, a shell 22 and a filter 23, one end of the connecting rod 21 is connected to the reamer 1, the other end of the connecting rod 21 is suitable for connecting to the drill pipe, the end of the shell 22 facing the reamer 1 is connected to the connecting rod 21, the end of the shell 22 facing away from the reamer 1 is provided with an opening, the filter 23 is arranged on the inner wall of the shell 22, and the shell 22 is provided with a plurality of water-permeable slots 221, the mud generated during the operation of the reamer 1 can pass through the water-permeable slots 221 and the filter 23 in sequence and flow from the opening to the widened pipe 3, or The mud can flow from the outer wall of the shell 22 and the inner wall of the channel being widened to the widened pipe 3. In the process of the mud passing through the water-permeable groove hole 221 and the filter screen 23 and flowing from the opening to the widened pipe 3, the water in the mud will be filtered by the filter screen 23 to flow out of the widened pipe 3. Therefore, the mud between the outer wall of the shell 22 and the inner wall of the channel will lose water and become viscous, and the viscous mud can be smeared on the inner wall of the channel through the outer wall of the shell 22, so that the surface layer of the inner wall of the channel has higher strength and is not easy to collapse.
[0034] See also Figure 1 Since there is a bent area in the channel, the outer shell 22 can be set to gradually increase in diameter from close to the reamer 1 to away from the reamer 1, so that the shape of the outer shell 22 can be more easily changed in the area where the channel turns and bends, and it is not easy to get stuck in the channel and not easy to damage the shape of the channel turning and bending.
[0035] Figure 4 This is a partial cross-sectional view of the first embodiment of the channel reinforcement unit in the drag pipe construction method of the present application after being cut along the axial direction of the connecting rod, see Figure 3 and Figure 4 In the first embodiment of the present application, the connecting rod 21 is configured to be connected to the reamer 1 and can rotate with the reamer 1, and the outer shell 22 includes a plurality of splicing plates 222 that are evenly spaced around the circumference of the connecting rod 21 and extend along the axial direction of the connecting rod 21, and water-permeable grooves 221 are formed between adjacent splicing plates 222, so that during the rotation of the outer shell 22, the splicing plates 222 can smear the relatively viscous mud that has lost water onto the inner wall of the channel, thereby making the surface layer of the inner wall of the channel have higher strength and less prone to collapse.
[0036] Specifically, each splicing plate 222 extends from one side along the length direction to the other side along the length direction in a direction away from the axis of the connecting rod 21, and the direction from the side away from the axis of the connecting rod 21 to the side close to the axis of the connecting rod 21 is the rotation direction of the reamer 1, and a water-permeable groove hole 221 is formed between the side of each splicing plate 222 away from the axis of the connecting rod 21 and the side of the adjacent splicing plate 222 close to the axis of the connecting rod 21. In addition, the filter screen 23 can be connected between one side of the axis of the connecting rod 21 of two adjacent splicing plates 222, so that the area of the water-permeable groove hole 221, especially the filter screen 23, can be larger, thereby achieving better water filtering effect, making the mud more viscous, thereby improving the support effect on the inner wall of the channel, and making the filter screen 23 less likely to contact the channel, thereby making the filter screen 23 less likely to be damaged.
[0037] Figure 5 yes Figure 4 For the enlarged view of area A, see Figure 4 and Figure 5 The end of each spliced plate 222 close to the reamer 1 is hinged to the connecting rod 21, and the end of each spliced plate 222 away from the reamer 1 can be close to or away from the connecting rod 21, and the end of each spliced plate 222 away from the reamer 1 is provided with a limit rod 2221, and the connecting rod 21 is provided with a plurality of sleeves 211 arranged at equal intervals along the axial direction of the connecting rod 21, and the number of the sleeves 211 is consistent with the number of the limit rods 2221 and corresponds to the limit rods 2221 one by one, and each sleeve 2 11 is provided with a spring 2111, and a limiting rod 2221 can be inserted into the sleeve 211 and connected to one end of the spring 2111, and the other end of the spring 2111 can be connected to the connecting rod 21 to ensure that the various splicing plates 222 will not fall apart, and when encountering stones during the hole expansion process, the end of the splicing plate 222 away from the reamer 1 can be deflected in the direction close to the connecting rod 21, thereby avoiding the stones and making it less likely that the channel reinforcement unit 2 will be stuck in the channel.
[0038] Figure 6 This is a stereogram of a second embodiment of a channel reinforcement unit in a drag pipe construction method of the present application. Figure 7 This is a partial cross-sectional view of the second embodiment of the channel reinforcement unit in the drag pipe construction method of the present application after being cut along the axial direction of the connecting rod, see Figure 6 and Figure 7In the second embodiment of the present application, the connecting rod 21 is configured to be connected to the reamer 1, and the connecting rod 21 does not rotate with the reamer 1, and the outer shell 22 can be configured to include a plurality of ring plates 223 arranged along the axial direction of the connecting rod 21, and the diameter of the ring plates 223 gradually increases from close to the reamer 1 to away from the reamer 1, and water-permeable grooves 221 are formed between adjacent ring plates 223, and the water-permeable grooves 221 are perpendicular to the axial direction of the connecting rod 21. It can be understood that a support rod can be set at the small diameter end of each ring plate 223 to realize the connection between the ring plate 223 and the connecting rod 21 via the support rod.
[0039] This structure can increase the number of water-permeable slot holes 221, and the filter screen 23 can be arranged between the small-diameter ends of two adjacent ring plates 223, so as to increase the water filtering area and realize step-by-step water filtering, so as to make the mud water content lower and the viscosity higher, and the viscous mud can be smeared on the inner wall of the channel through the outer wall of the outer shell 22, so that the surface layer of the inner wall of the channel has higher strength and is not prone to collapse.
[0040] From the direction of the ring plate 223 away from the reamer 1 to the direction close to the reamer 1, the small diameter end of the ring plate 223 is inserted into the large diameter end of the adjacent ring plate 223 to form more water-permeable slots 221 on the outer shell 22, thereby increasing the area of the water-permeable slots 221, so that the mud has a lower water content and a higher viscosity, and the support capacity of the inner wall of the channel is stronger and less prone to collapse, and the filter screen 23 is less likely to contact the channel, thereby making the filter screen 23 less likely to be damaged.
[0041] Figure 8 is along Figure 7 Schematic diagram of the local structure of the pipeline after axial section, see Figure 2 and Figure 8 In the reaming and pipe pulling step, the pipe 3 is connected to the reamer 1 via the connector 5. The connector 5 includes an inner connector 51 and multiple outer connectors 52. The inner connector 51 can be inserted into the pipe 3, and a seal is provided between the outer wall of the inner connector 51 and the inner wall of the pipe 3. A threaded hole is also provided on the outer wall of the inner connector 51, and a positioning hole matching the threaded hole is provided on the pipe 3. Multiple outer connectors 52 are arranged around the circumference of the pipe 3, and the outer connector 52 is provided with a through hole. Bolts can pass through the through hole, the seal and the positioning hole in sequence to connect with the threaded hole, so as to achieve a sealed connection between the pipe 3 and the connector 5.
[0042] The connector 5 also includes an anti-collapse part 53, which includes a plurality of enclosure plates. The external connecting part 52 includes a large diameter section and a small diameter section. The pipe 3 is connected to the large diameter section. The plurality of enclosure plates are arranged around the circumference of the small diameter section and are screwed with the small diameter section. The plurality of enclosure plates can enclose a truncated cone-shaped cylindrical structure. The end of the cylindrical structure close to the reamer 1 is the small mouth end, and the end of the cylindrical structure away from the reamer 1 is the large mouth end. A clearance is formed between the small mouth end and the reamer 1. The diameter of the large mouth end is consistent with the diameter of the pipe 3, and the ratio of the diameter of the small mouth end to the diameter of the large mouth end is greater than or equal to 0.8 and less than 1.
[0043] The anti-collapse member 53 is provided to fill the space between the pipe 3 and the reamer 1, so that the hole after being expanded by the reamer 1 can be promptly filled and supported by the anti-collapse member 53, thereby effectively preventing the collapse of the hole from affecting the dragging of the pipe 3, and the shape of the anti-collapse member 53 can more easily realize reversal at the turning and bending area of the hole, is not easy to get stuck in the hole, and is not easy to damage the shape of the turning and bending area of the hole.
[0044] The working principle of the dragging pipe construction method of this application is as follows: The mud generated during the expansion process passes through the water-permeable slot holes 221 and the filter screen 23 on the channel reinforcement unit 2 and flows from the opening to the widened pipe 3. The water in the mud will be filtered by the filter screen 23 to flow out from the widened pipe 3. Therefore, the mud between the outer wall of the shell 22 and the inner wall of the channel will lose water and become viscous, and the viscous mud can be smeared on the inner wall of the channel through the outer wall of the shell 22, so that the surface layer of the inner wall of the channel has higher strength and is not easy to collapse. In the process of expanding the hole and pulling the pipe, the space between the pipe 3 and the reamer 1 can be filled through the anti-collapse part 53, so that the channel after the hole is expanded by the reamer 1 can be filled and supported by the anti-collapse part 53 in time, so as to effectively prevent the collapse of the channel from affecting the dragging of the pipe 3, and the shape of the anti-collapse part 53 can more easily achieve reversal in the area where the channel turns and bends, and is not easy to get stuck in the channel, and is not easy to damage the shape of the channel turning and bending.
[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A method for constructing a dragging pipe, characterized in that: The steps include: Excavation of foundation pit: excavate a foundation pit at each end of the pipeline burial location, one of the two foundation pits is a working pit and the other is a receiving pit; Guided drilling: using a horizontal directional drilling rig to drive the drill bit to drill from the working pit to the receiving pit; Pre-reaming: using the horizontal directional drilling machine to drive the reamer (1) to reame from the receiving pit to the working pit, and connecting a hole reinforcement unit (2) to one end of the reamer (1) facing the receiving pit, so as to reinforce the inner wall of the hole through the hole reinforcement unit (2); Hole expansion and pipe pulling: using the horizontal directional drilling rig to drive the pipe (3) to move from the receiving pit to the working pit until the end of the pipe (3) connected to the hole expander (1) passes through the working pit.
2. A method for constructing a dragging pipe according to claim 1, characterized in that: The hole reinforcement unit (2) comprises a connecting rod (21), a shell (22) and a filter screen (23); one end of the connecting rod (21) is connected to the reamer (1); the other end of the connecting rod (21) is suitable for being connected to a drill pipe; the end of the shell (22) facing the reamer (1) is connected to the connecting rod (21); the end of the shell (22) facing away from the reamer (1) is provided with an opening; the filter screen (23) is provided on the inner wall of the shell (22); the shell (22) is provided with a plurality of water-permeable slot holes (221); the mud generated during the operation of the reamer (1) can sequentially pass through the water-permeable slot holes (221) and the filter screen (23) and flow from the opening to the widened pipe (3); or the mud can flow from the outer wall of the shell (22) and the inner wall of the hole being widened to the widened pipe (3).
3. A drag pipe construction method according to claim 2, characterized in that: The diameter of the outer shell (22) gradually increases in a direction from close to the reamer (1) to far away from the reamer (1).
4. A method for constructing a dragging pipe according to claim 3, characterized in that: The connecting rod (21) is connected to the reamer (1) and can rotate with the reamer (1), and the outer shell (22) comprises a plurality of split plates (222) which are evenly spaced around the circumference of the connecting rod (21) and extend along the axial direction of the connecting rod (21), and the water-permeable slots (221) are formed between adjacent split plates (222).
5. A method for constructing a dragging pipe according to claim 4, characterized in that: Each of the split plates (222) extends from one side along the length direction to another side along the length direction in a direction away from the axis of the connecting rod (21), and the direction from the side away from the axis of the connecting rod (21) to the side close to the axis of the connecting rod (21) is the rotation direction of the reamer (1), and the water-permeable slot hole (221) is formed between the side of each of the split plates (222) away from the axis of the connecting rod (21) and the side of the adjacent split plate (222) close to the axis of the connecting rod (21).
6. A method for constructing a dragging pipe according to claim 5, characterized in that: One end of each of the split plates (222) close to the reamer (1) is hinged to the connecting rod (21), one end of each of the split plates (222) away from the reamer (1) can approach or move away from the connecting rod (21), and one end of each of the split plates (222) away from the reamer (1) is provided with a limiting rod (2221); The connecting rod (21) is provided with a plurality of sleeves (211) arranged at equal intervals along the axial direction of the connecting rod (21); the number of the sleeves (211) is consistent with the number of the limiting rods (2221) and corresponds one-to-one with the limiting rods (2221); each sleeve (211) is provided with a spring (2111); the limiting rod (2221) can be inserted into the sleeve (211) and connected to the spring (2111).
7. A method for constructing a dragging pipe according to claim 3, characterized in that: The connecting rod (21) is connected to the reamer (1), and the connecting rod (21) does not rotate with the reamer (1); the housing (22) comprises a plurality of ring plates (223) arranged along the axial direction of the connecting rod (21); the diameter of the ring plates (223) gradually increases from close to the reamer (1) to far away from the reamer (1); and the water-permeable slot holes (221) are formed between adjacent ring plates (223); the water-permeable slot holes (221) are perpendicular to the axial direction of the connecting rod (21).
8. A method for constructing a dragging pipe according to claim 7, characterized in that: In a direction from the ring plate (223) away from the reamer (1) to the direction close to the reamer (1), the small diameter end of the ring plate (223) is inserted into the large diameter end of the adjacent ring plate (223).
9. A method for constructing a dragging pipe according to any one of claims 1 to 8, characterized in that: In the reaming and pipe drawing step, the pipe (3) is connected to the reamer (1) via a connector (5), the connector (5) comprising an inner connecting piece (51) and a plurality of outer connecting pieces (52), the inner connecting piece (51) being insertable into the pipe (3), and a sealing piece (4) being provided between an outer wall of the inner connecting piece (51) and an inner wall of the pipe (3), a threaded hole being further provided on the outer wall of the inner connecting piece (51), a positioning hole matching the threaded hole being provided on the pipe (3), a plurality of the outer connecting pieces (52) being arranged around the circumference of the pipe (3), and a through hole being provided on the outer connecting piece (52), and a bolt being able to pass through the through hole, the sealing piece (4) and the positioning hole in sequence to be connected to the threaded hole.
10. A method for constructing a dragging pipe according to claim 9, characterized in that: The connector (5) further comprises an anti-collapse component (53), wherein the anti-collapse component (53) comprises a plurality of enclosure plates, the external connection component (52) comprises a large diameter section and a small diameter section, the pipeline (3) is connected to the large diameter section, the plurality of enclosure plates are arranged around the circumference of the small diameter section and are screwed to the small diameter section, and the plurality of enclosure plates can enclose a truncated cone-shaped cylindrical structure, the end of the cylindrical structure close to the reamer (1) is a small end, and the end of the cylindrical structure away from the reamer (1) is a large end, a clearance is formed between the small end and the reamer (1), the diameter of the large end is consistent with the diameter of the pipeline (3), and the ratio of the diameter of the small end to the diameter of the large end is greater than or equal to 0.8 and less than 1.