A replacement device for buried plastic pipes and its usage method

Abstract

This invention relates to the field of trenchless replacement technology for buried plastic pipes, specifically to a device and method for replacing buried plastic pipes. A device for replacing buried plastic pipes includes: a cutting disc, comprising a disc body fixed to the inner wall of the cutting disc and an annular cutting edge at the front end of the cutting disc, the inner diameter of the annular cutting edge being larger than the outer diameter of the buried pipe; and a cutting and suction assembly, comprising: a cutting head on the disc body and a spiral channel within the disc body, the disc body being fixed to the inner wall of the cutting disc, and the spiral channel penetrating the disc body. This invention aims to solve the problem that when breaking plastic pipes, the pipes cannot be effectively broken or the broken plastic fragments easily become entangled on the cutting disc body, resulting in low construction efficiency, thereby providing a device and method for replacing buried plastic pipes.

Description

Technical Field

[0001] This invention relates to the field of trenchless replacement technology for buried plastic pipes, specifically to a device for replacing buried plastic pipes and its usage method. Background Technology

[0002] Plastic pipes (such as PE pipes, PPR pipes, and UPVC pipes) are widely used in municipal water supply and drainage, gas, and oil and gas industries due to their advantages of good toughness, light weight, corrosion resistance, wear resistance, and low cost. However, due to design flaws, improper construction, and inadequate operation and maintenance, plastic pipes often experience deformation, collapse, and corrosion during their service life, seriously affecting their normal use and even causing safety accidents. Since municipal pipelines are mainly located underground in cities, excavation for pipe replacement has a significant impact. Therefore, trenchless repair and replacement technologies are gradually being widely adopted.

[0003] Existing trenchless pipeline repair technologies are all based on lining and repairing existing pipelines. For severely deformed or collapsed pipelines, direct repair is not feasible. Current trenchless replacement technologies mainly include pipe breaking (cracking) and pipe insertion. Pipe breaking (cracking) not only causes significant disturbance to the surrounding soil but also fails to effectively "crack" the plastic pipe. While pipe insertion solves the problem of soil compression in pipe breaking (cracking), plastic fragments easily become entangled on the cutterhead during pipe breaking, resulting in low construction efficiency. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art in that plastic pipes cannot be effectively crushed or the crushed plastic fragments are easily entangled on the cutter head, resulting in low construction efficiency. Thus, the present invention provides a buried plastic pipe replacement device and a method of use.

[0005] To address the above problems, the present invention provides a buried plastic pipe replacement device, comprising:

[0006] A cutting disc includes a disc body fixed to the inner wall of the cutting disc and an annular cutting edge located at the front end of the cutting disc, wherein the inner diameter of the annular cutting edge is larger than the outer diameter of the buried pipe.

[0007] The cutting suction tube assembly includes: a cutting head disposed on the cutter disc body, and a spiral channel disposed within the cutter disc body, the spiral channel extending through the cutter disc body.

[0008] Optionally, it also includes a traction shaft disposed within the cutting disc, wherein a bearing is provided between the traction shaft and the cutting disc, and the traction shaft has a traction end facing the direction of the buried pipe to be replaced.

[0009] Optionally, it also includes a grouting assembly, which includes a grouting pump and a grouting conduit sleeved on the outer periphery of the pulling end. The grouting conduit is provided with a grouting nozzle facing the cutting head. A grouting hose is connected between the grouting pump and the grouting conduit. The grouting nozzle is correspondingly arranged with the cutting head.

[0010] Optionally, it also includes a front shield assembly disposed away from the cutting disc, the front shield assembly including a front shield body and a rotating power component disposed within the front shield body, the drive end of the rotating power component being disposed within the cutting disc.

[0011] Optionally, the front shield body includes an inner shell and an outer shell, which are connected by a connector. An annular channel is formed between the inner shell and the outer shell. The inlet of the annular channel is correspondingly provided with the chip outlet of the spiral channel. The inner shell is provided with a fixed chamber, which houses a rotating power component and a micro inertial measuring device.

[0012] Optionally, the outer periphery of the outlet of the annular channel is provided with a strapping assembly, which includes a strapping strap, a strapping guide rail, a strapper located on one side of the strapping guide rail, a shearing hand and a mechanical gripper located below the strapper, a tape feeder located below the strapping guide rail, and a tape storage box on the side of the tape feeder facing away from the mechanical gripper.

[0013] Optionally, it also includes a rear shield assembly disposed away from the front shield body. The rear shield assembly includes a rear shield body and a pipe connector. The rear shield body is disposed away from the cutting disc. A correction jack is provided between the rear shield body and the front shield body.

[0014] Optionally, the pipe connector is fixed to the end of the rear shield body. The pipe connector includes a stainless steel collar, a stainless steel outer ring disposed on the outer periphery of the stainless steel collar, and a washer disposed on the inner side of the stainless steel collar. Fasteners are provided on the stainless steel outer ring.

[0015] Optionally, it also includes a jacking device that drives the rear shield to move toward the buried pipe to be replaced.

[0016] A method of using a buried plastic pipe replacement device: In the cutting state, the annular cutting edge of the cutting disc moves forward along the length of the buried pipe while rotating. The cutting head is driven to rotate by the disc body, which drives the cutting disc to perform circumferential cutting on the buried pipe, breaking the buried pipe into pipe chips. The spiral channel absorbs the pipe chips.

[0017] The technical solution of this invention has the following advantages:

[0018] 1. The buried plastic pipe replacement device provided by the present invention includes a cutting disc, comprising a disc body fixed to the inner wall of the cutting disc, and an annular cutting edge disposed at the front end of the cutting disc, wherein the inner diameter of the annular cutting edge is larger than the outer diameter of the buried pipe; and a cutting and suction pipe assembly, comprising a cutting head disposed on the disc body, and a spiral channel disposed within the disc body, the spiral channel penetrating the disc body. In the cutting state, the annular cutting edge of the cutting disc advances along the length direction of the buried pipe during rotation, the cutting head is driven to rotate by the disc body, the cutting head performs circumferential cutting on the buried pipe, crushing the buried pipe into pipe chips, and the spiral channel absorbs the pipe chips into the spiral channel. By cutting the buried pipe circumferentially with the cutting head, the buried pipe is effectively crushed, and the pipe chips are sucked in by the spiral channel, avoiding the defect of pipe chips entangled in the disc body, thus improving construction efficiency. Meanwhile, the replacement device provided in this application will not cause significant disturbance to the surrounding land during the process of breaking the buried pipe, thus avoiding deformation and stress changes in the soil around the replacement device.

[0019] 2. The buried plastic pipe replacement device provided by the present invention further includes a traction shaft disposed in the cutting disc, a bearing disposed between the traction shaft and the cutting disc, and a traction end disposed on the traction shaft in the direction of the buried plastic pipe to be replaced. By the traction end, a force is applied to the traction end in the direction of the buried pipe to be replaced, thereby driving the cutting disc to move.

[0020] 3. The buried plastic pipe replacement device provided by the present invention further includes a grouting assembly. The grouting assembly includes a grouting pump and a grouting conduit sleeved on the outer periphery of the pulling end. The grouting conduit is provided with a grouting nozzle facing the cutting head. A grouting hose is connected between the grouting pump and the grouting conduit. The grouting nozzle is correspondingly arranged with the cutting head. The slurry generated by the grouting pump passes sequentially through the grouting hose and the grouting conduit to the grouting nozzle, and is then sprayed out by the grouting nozzle to reduce the temperature of the cutting head, increase the fluidity of the pipe chips, and reduce the friction between the buried pipe and the cutting head.

[0021] 4. The buried plastic pipe replacement device provided by the present invention further includes a front shield assembly disposed away from the cutter head. The front shield assembly includes a front shield body and a rotating power component disposed within the front shield body. The driving end of the rotating power component is disposed within the cutter head, and the driving end of the rotating power component drives the cutter head to rotate, so that the cutter head can crush the buried pipe.

[0022] 5. The buried plastic pipe replacement device provided by the present invention comprises an inner shell and an outer shell, which are connected by a connector. An annular channel is formed between the inner shell and the outer shell. The inlet of the annular channel corresponds to the chip outlet of the spiral channel. The inner shell is provided with a fixed chamber, which houses a rotating power component. A micro inertial measuring device is provided in the fixed chamber. The micro inertial measuring device locates the three-dimensional coordinates of its position in real time and then transmits the signal to the controller wirelessly, facilitating on-site personnel to determine the specific position of the cutting disc underground.

[0023] 6. The buried plastic pipe replacement device provided by the present invention has a binding assembly on the outer periphery of the outlet of the annular channel. The binding assembly includes a binding strap, a binding guide rail, a bundler located on one side of the binding guide rail, a shearing hand and a mechanical gripper located below the bundler, a feeder below the binding guide rail, and a storage box on the side of the feeder away from the mechanical gripper. The binding assembly is used to bind the pipe debris coming out of the annular channel.

[0024] 7. The buried plastic pipe replacement device provided by the present invention further includes a rear shield assembly, which includes a rear shield body. The rear shield body is disposed away from the cutting disc. A correction jack is provided between the rear shield body and the front shield body. When misalignment occurs between adjacent old buried pipes, the correction jack drives the front shield body and the cutting disc to shift, so that the annular cutting edge of the cutting disc is sleeved on the outer periphery of the buried pipe.

[0025] 8. The buried plastic pipe replacement device provided by the present invention has a pipe connector at one end of the rear shield body away from the jacking device. The pipe connector includes a stainless steel collar, a stainless steel outer ring disposed on the outer periphery of the stainless steel collar, and a washer disposed on the inner side of the stainless steel collar. Fasteners are provided on the stainless steel outer ring. The pipe connector is used to connect the rear shield body and the new pipe.

[0026] 9. The buried plastic pipe replacement device provided by the present invention further includes a jacking device, which drives the rear shield to move toward the buried pipe to be replaced, so as to push the front shield and the cutting disc toward the buried pipe to be replaced. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the buried plastic pipe replacement device provided in an embodiment of the present invention when it is located underground and is used by a pulling method.

[0029] Figure 2 This is a schematic diagram of the buried plastic pipe replacement device provided in an embodiment of the present invention when it is located underground and is used by jacking method.

[0030] Figure 3 This is a schematic diagram showing the connection between the cutting disc, the front shield body, and the rear shield body in an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the tension shaft provided in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a cutting disc provided in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the cutting disc and suction tube assembly provided in an embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the bundling assembly provided in an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of a pipe connector provided in an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached drawings: 1. Replacement device; 2. Steel wire rope; 3. Buried pipe to be replaced; 4. Pulley; 5. Winch; 6. New pipeline; 7. Launching shaft; 8. Receiving shaft; 9. Jacking device; 10. Cutting disc; 101. Annular cutting edge; 102. Cutting head; 103. Spiral channel; 104. Cutting disc body; 11. Front shield body; 111. Inner shell; 112. Outer shell; 113. Connecting component; 114. Fixing chamber; 115. Micro-inertial measuring device; 116. Annular channel; 12. Rear shield body; 13. Traction shaft; 131. Pulling end; 14. Rotating power component; 15. Correction jack; 16. Grouting assembly; 161. Grouting nozzle; 162. Grouting conduit; 163. Grouting pump; 164. Grouting hose; 17. Bundling assembly; 171. Bundling strap; 172. Bundling guide rail; 173. Bundler; 174. Retractable strap component; 175. Cutting hand; 176. Mechanical gripper; 177. Strap storage box; 18. Pipe connector; 181. Fastener; 182. Stainless steel collar; 183. Stainless steel outer ring; 184. Washer. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Example 1

[0042] like Figure 1 A specific embodiment of the buried plastic pipe replacement device shown in Figure 8 includes: a starting well 7 and a receiving well 8 spaced apart, a buried pipe 3 to be replaced located between the two and buried underground, and a buried plastic pipe replacement device 1 starting from the starting well 7. The buried plastic pipe replacement device 1 is sequentially provided with a cutting disc 10, a front shield assembly, and a rear shield assembly.

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, the cutting disc 10 is annular, including a disc body 104 fixed on the inner wall of the cutting disc 10 and an annular cutting edge 101 disposed at the front end of the cutting disc 10. The cutting disc 10 is adapted to move along the length direction of the buried pipe, and the annular cutting edge 101 is adapted to be disposed toward the buried pipe 3 to be replaced. The inner diameter of the annular cutting edge 101 is larger than the outer diameter of the buried pipe, and the cutting disc 10 is sleeved on the outer periphery of the buried pipe 3 to be replaced.

[0044] like Figure 5 , Figure 6As shown, for the crushing and replacement of buried pipe 3, the cutting disc 10 also includes a cutting suction pipe assembly. The cutting suction pipe assembly includes a disc body 104, three cutting heads 102 mounted on the disc body 104, and three spiral channels 103 within the cutting disc 10. The disc body 104 is fixed to the inner wall of the cutting disc 10, and the spiral channels 103 penetrate the disc body 104. Figure 5 As shown, the cutting heads 102 are evenly spaced on the cutter disc body 104, and each spiral channel 103 is provided with a corresponding cutting head 102.

[0045] like Figure 1 , Figure 3 and Figure 4 As shown, to move the cutting disc 10 forward, a traction shaft 13 is also included within the cutting disc 10. A bearing is provided between the traction shaft 13 and the cutting disc 10. The traction shaft 13 has a traction end 131 facing the direction of the buried pipe 3 to be replaced. Simultaneously, a winch 5 is provided above the receiving well 8, and a guide frame is provided below the receiving well 8. A pulley 4 is provided on the guide frame. A wire rope 2 is provided between the winch 5 and the traction end 131, and the wire rope 2 passes through the pulley 4, which provides guidance for the wire rope 2. Figure 1 , Figure 2 As shown, it also includes a grouting assembly 16, which includes a grouting pump 163, a mud storage tank, and a grouting conduit 162 sleeved on the outer periphery of the pulling end 131. The grouting conduit 162 is provided with grouting nozzles 161 facing the cutting head 102. A grouting hose 164 is connected between the grouting pump 163 and the grouting conduit 162. Three grouting nozzles are evenly distributed in the circumference of the pulling end 131.

[0046] like Figure 1 , Figure 2 and Figure 3 As shown, the front shield assembly is positioned away from the cutting disc 10. The front shield assembly includes a front shield 11 and a rotating power component 14 disposed within the front shield 11. The drive end of the rotating power component 14 is located within the cutting disc 10, i.e., the drive end is fixedly connected to the cutting disc 10 to drive the cutting disc 10 to rotate. Figure 3 As shown, the front shield body 11 includes an inner shell 111 and an outer shell 112, which are connected by a connector 113. An annular channel 116 is formed between the inner shell 111 and the outer shell 112. The inlet of the annular channel 116 corresponds to the chip outlet of the spiral channel 103, and the annular channel 116 converges at the outlet. The inner shell 111 is provided with a fixed chamber 114, which houses a rotating power component 14 and a micro-inertial measuring device 115. Figure 3 , Figure 7As shown, the outer casing 112 is provided with a binding assembly 17 at the end opposite to the cutting disc 10, wherein the binding assembly 17 is located on the outer periphery of the outlet of the annular channel 116.

[0047] like Figure 7 As shown, the strapping assembly 17 includes a strapping strap 171, a strapping guide rail 172, a strapper 173 located on one side of the strapping guide rail 172, a shearing hand 175 and a mechanical gripper 176 located below the strapper 173, a tape retraction component 174 located below the strapping guide rail 172, and a tape storage box 177 located on one side of the tape retraction component 174. The tape retraction component 174 feeds the strapping strap 171 through the shearing hand 175 and the strapper 173 onto the strapping guide rail 172. After the strapping strap 171 has wrapped around the strapping guide rail 172 once, the mechanical gripper 176 extends, passes through the shearing hand 175 and the strapper 173, clamps the end of the strapping strap 171, and then retracts to its original position. The tape retraction component 174 reverses direction, tightens the strapping strap 171, and sends the excess strapping strap to the tape storage box 177. After tightening, the elastic baffle inside the strapping guide 172 automatically opens under the pressure of the strapping tape 171. The strapping tape 171 is then placed on the cut tube segment. The feed tape 174 continues to reverse and tighten the strapping tape 171 for strapping. The strapping device 173 places the pre-made buckle on the strapping tape 171. Then, the shearing hand 175 below the strapping device 173 cuts the strapping tape, completing one strapping operation. The above strapping action is repeated to complete the next strapping operation.

[0048] As shown in the figure Figure 1 , Figure 2 and Figure 3 As shown, it also includes a rear shield assembly, which includes a rear shield 12, three equally spaced corrective jacks 15 disposed between the rear shield 12 and the front shield 11, and a pipe connector 18 disposed away from the front shield 11. The rear shield 12 is disposed away from the front shield 11 and is connected to the front shield 11 by the corrective jacks 15. The pipe connector 18 is suitable for fixing the new pipe 6. Figure 8 As shown, the pipe connector 18 uses an open stainless steel collar 182 and a stainless steel outer ring 183 for mating. After the new pipe 6 is placed into the pipe connector 18, the stainless steel outer ring 183 is contracted by the fastener 181, which in turn causes the stainless steel collar 182 to contract and clamp the new pipe 6. The washer 184 can increase the friction between the new pipe 6 and the pipe connector 18 and protect the new pipe 6.

[0049] It also includes a controller and a display. The controller is connected to the rotating power component 14, the correction jack 15, the binding assembly 17, and the micro inertial measuring device 115. The display shows the various parameters of the controller in real time.

[0050] A method for using a buried plastic pipe replacement device 1, wherein when replacing a buried pipe by pulling, such as Figure 1 As shown, it includes the following steps:

[0051] 1) Based on the original inspection wells of the pipeline, the inspection wells are modified to become the starting well 7 and the receiving well 8;

[0052] 2) Install the winch 5 and grouting pump 163 on the ground above the receiving well 8. Install the guide frame and fixed pulley 4 inside the receiving well 8. Connect the grout inlet of the grouting pump 163 to the mud storage tank and the grout outlet of the grouting pump 163 to the grouting hose 164. At the same time, the wire rope 2 of the winch 5 passes through the pulley 4. Then, the grouting hose 164 and the wire rope 2 pass through the buried pipe to be replaced 3 and enter the starting well 7.

[0053] 3) Based on the size, material and deformation of the buried pipe 3 to be replaced, select a suitable replacement device 1. Excavate an annular gap between the end of the buried pipe 3 to be replaced and the soil layer in the starting well 7, so that the annular cutting edge 101 of the cutting disc 10 is fitted on the outer periphery of the buried pipe 3 to be replaced. At the same time, fix the wire rope 2 to the pulling end 131 and the grouting hose 164 to the grouting conduit 162. Connect the new pipe 6 to the rear shield body 12 through the pipe connector 18. The overall length of the new pipe 6 is consistent with the length of the buried pipe 3 to be replaced.

[0054] 4) The controller sends a command to start the grouting pump 163, the rotary power component 14 and the winch 5. The grouting pump 163 draws grout from the mud storage tank and sends the grout through the grouting hose 164 and the grouting conduit 162 to the grouting nozzle 161. The rotary power component 14 drives the cutting disc 10 to rotate. The cutting head 102 on the cutting disc 10 cuts the pipe to be replaced and the annular cutting edge 101 cuts the rock and soil around the pipe to be replaced. The winch 5 drives the traction shaft 13 to move in the direction of the pipe to be replaced.

[0055] 5) During the pulling process, the cut strips of pipe debris pass through the spiral channel 103 and the annular channel 116 and are then automatically bundled by the binding assembly 17 into the new pipe 6;

[0056] 6) After the buried pipe 3 to be replaced is cut, the replacement device 1 is retrieved. The wire rope 2 of the winch 5 is used to pull the bundled strips of pipe debris out of the new pipe 6, and the starting well 7 and receiving well 8 are restored.

[0057] Example 2

[0058] A method for using a buried plastic pipe replacement device 1, wherein when replacing the buried pipe 3 by jacking, as follows: Figure 2 As shown, it includes the following steps:

[0059] 1) Based on the original inspection wells of the pipeline, the inspection wells are modified to become the starting well 7 and the receiving well 8;

[0060] 2) Install the grouting pump 163 on the ground above the receiving well 8. The grouting pump 163 is connected to the mud storage tank and the grouting pump 163 is connected to the grouting hose 164. The grouting hose 164 passes through the buried pipe 3 to be replaced and enters the starting well 7.

[0061] 3) Based on the size, material and deformation of the buried pipe 3 to be replaced, select a suitable replacement device 1, excavate an annular gap between the end of the buried pipe 3 to be replaced and the soil layer in the starting well 7, so that the annular cutting edge 101 of the cutting disc 10 is fitted on the outer periphery of the buried pipe 3 to be replaced. At the same time, the grouting hose 164 is connected to the grouting conduit 162, and the jacking device 9 is installed in the starting well 7.

[0062] 4) The controller sends a command to start the grouting pump 163, the rotary power component 14, and the jacking device 9. The grouting pump 163 draws grout from the mud storage tank and sends the grout through the grouting hose 164 and the grouting conduit 162 to the grouting nozzle 161. The rotary power component 14 drives the cutting disc 10 to rotate. The cutting head 102 on the cutting disc 10 cuts the pipe to be replaced, and the annular cutting edge 101 cuts the rock and soil around the pipe to be replaced. The jacking device 9 pushes the rear shield body 12 toward the pipe to be replaced.

[0063] 5) During the jacking process, the cut strips of pipe debris pass through the spiral channel 103 and the annular channel 116 and are then automatically bundled by the bundling assembly 17 before entering the new pipe 6;

[0064] 6) After the pusher jacking device 9 pushes the rear shield body 12 forward a certain distance toward the buried pipe 3 to be replaced, when the pipe connector 18 of the rear shield body 12 reaches the port of the pipe to be replaced in the launching shaft 7 (that is, when the replacement device 1 is about to fully enter the soil layer), the pusher 9 retracts and the first section of new pipe 6 is lowered into the launching shaft 7 onto the guide rail of the pusher 9. One end of the pipe connector 18 is fixed in the rear shield body 12, and the other end is fixed to the pusher 9. The jacking begins. After the first section of new pipe 6 is fully entered into the soil layer, the second section of new pipe is lowered and the jacking is repeated until the replacement device 1 reaches the receiving shaft 8.

[0065] 7) After the buried pipe 3 to be replaced is cut, the replacement device 1 is retrieved, the bundled strips of pipe debris are pulled out from the new pipe 6, and the starting well 7 and receiving well 8 are restored.

[0066] As an alternative implementation, the number of cutting heads 102 and helical channels 103 may be two, four or even more.

[0067] As an alternative implementation, the number of grouting nozzles 161 may be 4, 5, 6 or even more.

[0068] As an alternative implementation, the number of corrective jacks 15 can be 4, 5, 6 or even more.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A device for replacing buried plastic pipes, characterized in that, include: The cutting disc (10) includes a disc body (104) fixed on the inner wall of the cutting disc (10) and an annular cutting edge (101) provided at the front end of the cutting disc (10), wherein the inner diameter of the annular cutting edge (101) is larger than the outer diameter of the buried pipe; The cutting suction tube assembly includes: a cutting head (102) disposed on the cutter disc body (104) and a spiral channel (103) disposed in the cutter disc body (104), the spiral channel (103) being disposed through the cutter disc body (104); It also includes a traction shaft (13) disposed in the cutting disc (10), a bearing is provided between the traction shaft (13) and the cutting disc (10), and the traction shaft (13) is provided with a traction end (131) facing the buried pipe (3) to be replaced. It also includes a front shield body (11) assembly disposed away from the cutting disc (10), the front shield body (11) assembly including a front shield body (11) and a rotating power component (14) disposed in the front shield body (11), the driving end of the rotating power component (14) being disposed in the cutting disc (10); The front shield body (11) includes an inner shell (111) and an outer shell (112), which are connected by a connector (113), and an annular channel (116) is formed between the inner shell (111) and the outer shell (112). The outer periphery of the outlet of the annular channel (116) is provided with a strapping assembly (17), the strapping assembly (17) includes a strapping strap (171), a strapping guide rail (172), a strapper (173) located on one side of the strapping guide rail (172), a shearing hand (175) and a mechanical gripper (176) located below the strapper (173), a tape feeder (174) located below the strapping guide rail (172), and a tape storage box (177) on the side of the tape feeder (174) facing away from the mechanical gripper (176). The buried pipe is effectively crushed by circumferential cutting of the cutting head, and the pipe debris is sucked in by the spiral channel. After being cut, the strip-shaped pipe fragments pass through the spiral channel (103) and the annular channel (116) and are then automatically bundled by the bundling assembly (17) into the new pipe (6).

2. The buried plastic pipe replacement device according to claim 1, characterized in that, It also includes a grouting assembly (16), which includes a grouting pump (163) and a grouting conduit (162) sleeved on the outer periphery of the pulling end (131). The grouting conduit (162) is provided with a grouting nozzle (161) facing the cutting head (102). A grouting hose (164) is connected between the grouting pump (163) and the grouting conduit (162).

3. The buried plastic pipe replacement device according to claim 1, characterized in that, The entrance of the annular channel (116) is correspondingly set to the chip outlet of the spiral channel (103). The inner shell (111) is provided with a fixed chamber (114), which contains a rotating power component (14) and a micro inertial measuring device (115).

4. The buried plastic pipe replacement device according to claim 1, characterized in that, It also includes a rear shield assembly that is set away from the front shield body (11), the rear shield assembly including a rear shield body (12) and a pipe connector (18), and a correction jack (15) is provided between the rear shield body (12) and the front shield body (11).

5. The buried plastic pipe replacement device according to claim 4, characterized in that, The pipe connector (18) is fixed to the end of the rear shield body (12). The pipe connector (18) includes a stainless steel collar (182), a stainless steel outer ring (183) disposed on the outer periphery of the stainless steel collar (182), and a washer (184) disposed on the inner side of the stainless steel collar (182). The stainless steel outer ring (183) is provided with a fastener (181).

6. The buried plastic pipe replacement device according to claim 5, characterized in that, It also includes a jacking device (9), which drives the rear shield body (12) to move toward the buried pipe (3) to be replaced.

7. A method of using a buried plastic pipe replacement device, for using the buried plastic pipe replacement device according to claim 1, characterized in that, In the cutting state, the annular cutting edge (101) of the cutting disc (10) moves forward along the length of the buried pipe while rotating. The cutting head (102) is driven to rotate by the disc body (104), which drives the cutting disc (10) to perform circumferential cutting on the buried pipe, causing the buried pipe to break into pipe chips. The spiral channel (103) absorbs the pipe chips.

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