Non-excavation repairing device for buried drainage pipe and construction method

Abstract

The construction device comprises a plurality of PE pipes and a plurality of pull rods, and further comprises a first foundation pit and a second foundation pit, a winch is arranged in the first foundation pit, a traction rope of the winch pulls the PE pipes through a pull pipe head and a flange to conduct penetrating operation, and the PE pipes are connected with the second foundation pit. And assembling an upper pipe of a next PE pipe and a next pull rod in the second foundation pit in the gap when the winch drags the assembled PE pipe to penetrate through each time, after assembling, the tail end of the pull rod extends out of the rear end of the PE pipe, a push disc and an ejector are detachably arranged on the pull rod in sequence, and the ejector pushes the PE pipe to move forwards through the push disc so that the PE pipe can be connected with the assembled PE pipe in a bell and spigot joint mode. The construction method is convenient to construct and convenient to disassemble and assemble, the drainage pipe can be rapidly repaired in a non-excavation state, and the repairing construction speed and efficiency of the drainage pipe are improved.

Description

Technical Field

[0001] The present invention belongs to the field of pipeline construction, and in particular relates to a trenchless repair device and a construction method for a buried drainage pipe. Background Art

[0002] Trenchless technology is an extremely important construction method for laying urban pipelines. For buried concrete drainage pipes in cities and towns, since most drainage pipes are located in areas with heavy traffic, sensitive environments, and limited construction space, once the drainage pipes are damaged, trenchless repair technology is preferred.

[0003] At present, most of the trenchless repair construction equipment for drainage pipes has a complex structure, which is not convenient for assembling and threading PE pipes used for drainage pipe repair, bringing inconvenience to the trenchless repair construction of drainage pipes and affecting construction efficiency. Summary of the Invention

[0004] In view of this, the present invention aims to provide a trenchless repair device and construction method for buried drainage pipes, so as to quickly repair broken drainage pipes under trenchless conditions.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A trenchless repair device for buried drainage pipes, comprising:

[0007] A plurality of PE pipes and a plurality of tie rods are used for repairing a drainage pipe. The plurality of PE pipes can be sequentially assembled by socket and splice, and the plurality of tie rods can be sequentially assembled in a removable manner. The total length of the assembled plurality of tie rods is greater than the total length of the assembled plurality of PE pipes. The invention also includes:

[0008] The first foundation pit and the second foundation pit are respectively arranged at the two ends of the drainage pipe. A winch is provided in the first foundation pit. A pipe pulling head is provided on the traction rope of the winch. The pipe pulling head is connected to the assembled PE pipe and the assembled pull rod through a flange, wherein the pull rod passes through the center of the PE pipe. Each time the winch pulls the assembled PE pipe through the gap of the movement, the upper pipe of the next PE pipe and the next pull rod are assembled in the second foundation pit. After assembly, the tail end of the pull rod extends from the rear end of the PE pipe. A push plate and a pusher are detachably arranged on the pull rod in sequence, wherein the push plate is facing the next PE pipe, and the pusher pushes the next PE pipe forward through the push plate to make it connected with the previously assembled PE pipe in socket connection.

[0009] Furthermore, two adjacent tie rods are threadedly connected; and the flange is threadedly connected to the first tie rod.

[0010] Furthermore, a limiting ring groove is provided on the outer surface of the pipe wall of one end of the first PE pipe, and a socket ring groove is provided on the outer surface of the pipe wall of the other end; a socket is provided on the inner surface of the pipe wall of one end of all the remaining PE pipes, and a socket ring groove corresponding to the socket is provided on the outer surface of the pipe wall of the other end;

[0011] During assembly, the socket ring groove of the front PE pipe is connected to the socket of the adjacent PE pipe at the back;

[0012] The diameter of the flange is the same as the outer diameter of the PE pipe, and a number of clamping blocks are respectively protruded from the limiting ring groove of the first PE pipe corresponding to the end face of the flange and the socket ring groove of the PE pipe corresponding to the end face of the push plate. The several clamping blocks on the flange wrap the limiting ring groove of the first PE pipe inside, and a through hole is set at the center of the push plate. The pull rod and the through hole are assembled in a gap, and the several clamping blocks on the push plate wrap the corresponding socket ring groove of the PE pipe inside.

[0013] Furthermore, the pusher includes two fixed plates arranged opposite to each other, each of which has a slot corresponding to the pull rod facing downward, the slot passing through the center of the fixed plate, and the pusher is inserted into the pull rod through the slot. The two fixed plates are connected by two hydraulic cylinders symmetrically arranged on both sides of the slot, and the hydraulic cylinders are arranged below the center of the fixed plate;

[0014] The pull rod is evenly provided with a plurality of limiting holes in the axial direction. The ejector is matched with a limiting rod, which is inserted into a limiting hole adjacent to the rear end of the ejector. The limiting rod limits the rearward movement of the ejector.

[0015] Furthermore, a plane structure is respectively provided at the bottom of the two fixing plates, and the plane structures of the two fixing plates are located in the same horizontal plane.

[0016] Furthermore, the pull rod and the PE pipe are of equal length.

[0017] The above is an explanation of the technical solution of the trenchless repair device for buried drainage pipes. The following is an explanation of the technical solution of the trenchless repair construction method for buried drainage pipes:

[0018] A trenchless repair construction method for a buried drainage pipe comprises the following steps:

[0019] S10. Excavation of foundation pit and installation of auxiliary equipment:

[0020] A first foundation pit is dug at one end of the drainage pipe to be repaired and a second foundation pit is dug at the other end. The interior of the drainage pipe is cleaned, and a winch is installed in the first foundation pit. A pipe joint is installed on the traction rope of the winch, and a flange is set on the pipe joint. A lifting device is set outside the second foundation pit to lift the PE pipe used to repair the drainage pipe into the second foundation pit.

[0021] S20. Installation of the first PE pipe:

[0022] In the second foundation pit, detachably install the first tie rod at the center of the flange. Sleeve the first PE pipe onto the outside of the first tie rod in the installation direction with its limit ring groove facing forward and the socket ring groove facing backward. Insert the limit ring groove into several clamping blocks of the flange. The several clamping blocks wrap the limit ring groove. Then, assemble the second tie rod at the rear end of the first tie rod.

[0023] Put the push plate on the assembled pull rod, and make the several clamping blocks of the push plate wrap the socket ring groove of the first PE pipe;

[0024] S30, Installation of the thruster:

[0025] Install the ejector on the second pull rod through the slot. After installation, the push rod of the hydraulic cylinder of the ejector faces the push plate. Insert the limit rod into the limit hole set on the second pull rod, which is close to the rear end of the ejector. The limit rod limits the rearward movement of the ejector.

[0026] S40, threading of the first PE pipe:

[0027] The pusher is turned on, and the push rod of its hydraulic cylinder extends to press the push plate. The first PE pipe is clamped and fixed by the push plate and the flange. The pusher maintains this pressing state. The winch is activated to pull the first PE pipe into the drain pipe for a set distance. After the movement, the rear end of the first PE pipe should still be outside the drain pipe.

[0028] After the first PE pipe is threaded, remove the push plate, pusher and limit rod;

[0029] S50, assembly of the next PE pipe:

[0030] Put the next PE pipe on the assembled tie rod in the installation direction with the socket facing forward and the socket ring groove facing backward, and make the socket of the next PE pipe face the socket ring groove of the PE pipe that has been inserted into the drainage pipe;

[0031] Assemble the next tie rod at the rear end of the assembled tie rod, and then install the push plate, ejector and limit rod on the assembled tie rod in sequence, and ensure that the several clamping blocks of the push plate can cover the socket ring groove of the next PE pipe, and the push rod of the ejector is facing the push plate;

[0032] The pusher is turned on, and the push rod of its hydraulic cylinder extends out to push the push plate, which pushes the next PE pipe forward until its socket is connected with the socket ring groove of the previous PE pipe that has been inserted into the drainage pipe, completing the assembly of the next PE pipe and the previous PE pipe;

[0033] S60, threading of assembled PE pipes:

[0034] The pusher keeps its pushing state unchanged, and the winch moves again, pulling the assembled PE pipe into the drain pipe again for a set distance, and after the movement, the rear end of the next PE pipe is located outside the drain pipe;

[0035] After the assembled PE pipe is threaded, remove the push plate, pusher and limit rod;

[0036] S70: Repeat steps S50 and S60 to complete the repair of the drain pipe.

[0037] Repeat steps S50 and S60 to complete the assembly of several PE pipes for drain pipe repair and the threading of the assembled PE pipes. At this time, the front end of the first PE pipe is exposed from the first foundation pit, completing the drain pipe repair in a trenchless state.

[0038] Furthermore, in step S10, the bottom pipe wall of the drainage pipe is retained when the second foundation pit is excavated, or two guide rails are set corresponding to the drainage pipe in the second foundation pit to temporarily support the PE pipe and guide its traction movement when assembling the PE pipe.

[0039] Compared with the existing technology, the trenchless repair device and construction method of the buried drainage pipe described in the present invention have the following advantages:

[0040] (1) The present invention is convenient to construct and to assemble and disassemble. A plurality of PE pipes and a plurality of tie rods are provided for the corresponding drainage pipes to be repaired. The PE pipes and tie rods are assembled separately by utilizing the stepping gap of the winch, and the PE pipe is pushed forward by the pusher to be connected with the adjacent PE pipe in front by a socket. Then, the pusher maintains the pushing state, and the pipe threading operation is performed by pulling with the winch, thereby realizing the rapid repair operation of the drainage pipe in the unexcavated state, thereby improving the speed and efficiency of the drainage pipe repair construction.

[0041] (2) In the present invention, the arrangement of the clamping blocks on the flange and the push plate can center the PE pipe, so that the two PE pipes can be quickly connected by socket and spigot, thereby improving the construction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0043] Figure 1 This is a schematic diagram of a trenchless repair device for buried drainage pipes according to an embodiment of the present invention;

[0044] Figure 2 Schematic diagram of the pull rod structure in this embodiment;

[0045] Figure 3 This is a schematic diagram of the first PE pipe structure in this embodiment;

[0046] Figure 4 This is a schematic diagram of the PE pipe structure in this embodiment;

[0047] Figure 5 Schematic diagram of the flange structure in this embodiment;

[0048] Figure 6 This is a schematic diagram of the push plate structure in this embodiment;

[0049] Figure 7 Schematic diagram of the structure of the pusher in this embodiment;

[0050] Figure 8 This is the construction flow chart for trenchless repair of drainage pipes.

[0051] Description of reference numerals:

[0052] 1-drain pipe; 2-pipe pull head; 3-flange; 4-PE pipe; 41-socket ring groove; 42-socket; 43-limiting ring groove; 431-conical structure; 5-pull rod; 51-limiting hole; 52-external threaded part; 53-threaded hole; 6-thruster; 61-fixing plate; 62-slot; 63-hydraulic cylinder; 64-grip rod; 65-plane structure; 7-limiting rod; 8-push plate; 9-traction rope; 10-winch; 11-clamping block; 12-through hole; 13-boss; 14-first foundation pit; 15-second foundation pit. DETAILED DESCRIPTION

[0053] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0054] First, a trenchless repair device for buried drainage pipes is described in detail through an embodiment:

[0055] like Figure 1 As shown, a trenchless repair device for buried drainage pipes includes several PE pipes 4 and several tie rods 5 for repairing the drainage pipe 1. Preferably, the outer diameter of the PE pipes 4 is equal to or slightly smaller than the inner diameter of the drainage pipe 1; the tie rods 5 are the same length as the PE pipes 4, and the number of tie rods 5 exceeds the number of PE pipes 4. The PE pipes 4 can be assembled sequentially using socket joints, and the tie rods 5 can be assembled sequentially using removable joints. The total length of the assembled tie rods 5 is greater than the total length of the assembled PE pipes 4. It also includes a first foundation pit 14 and a second foundation pit 15. The first foundation pit 14 and the second foundation pit 15 are respectively arranged at both ends of the drainage pipe 1, wherein the second foundation pit 15 is an assembly foundation pit, used for assembling the pull rod 5 and assembling the PE pipe. The first foundation pit 1 is a traction foundation pit, which is provided with a winch 10. The winch 10 is used to pull the assembled PE pipe in the second foundation pit 15, so that the assembled PE pipe can be inserted into the drainage pipe to realize the PE pipe threading operation.

[0056] Specifically, the traction rope 9 of the hoist 10 is provided with a pipe pull head 2, which is spot-welded or screwed to a flange 3. The outer diameter of the flange 3 is the same as that of the PE pipe 4. The flange 3 and the assembled PE pipe 4 are detachably connected. The assembled pull rod 5 passes through the center of the PE pipe 4 and is then installed at the center of the flange 3. During the interval between each time the winch 10 pulls and assembles the PE pipe for pipe threading, that is, during the interval between two adjacent pulling and pulling actions of the winch 10, the upper pipe of the next PE pipe 4 and the next pull rod 5 are assembled in the second foundation pit 15, so as to assemble several PE pipes in the limited working space of the second foundation pit 15; that is, during the interval, the next PE pipe 4 is first put onto the outside of the assembled pull rod 5, and then the next pull rod 5 is assembled at the rear end of the assembled pull rod 5 to complete the assembly of the next pull rod 5. This assembly method ensures that the number of pull rods after assembly is always one more than the number of PE pipes after assembly, ensuring that there is always a pull rod 5 extending out of the PE pipe, so as to facilitate the installation of the pusher and the pushing operation of the pusher. A push plate 8 and a pusher 6 are detachably provided on the pull rod 5, wherein the push plate 8 is facing the next PE pipe 4, and the pusher 6 pushes the push plate 8, and the next PE pipe 4 is pushed forward by the push plate 8 so that it is connected with the assembled previous PE pipe through a socket, thereby realizing the assembly of the next PE pipe.

[0057] The structure of the pull rod 5 is as follows Figure 2 As shown, one end of the tie rod is provided with an external threaded portion 52 and the other end is provided with a threaded hole 53. The threaded hole 53 is adapted to the external threaded portion 52, and a plurality of stop holes 51 are evenly distributed along the axial direction of the tie rod. During assembly, the external threaded portion 52 of the tie rod 5 faces forward and the threaded hole 53 faces backward. The external threaded portion 52 of the rear tie rod 5 is screwed into the threaded hole 53 of the front tie rod 5, so that the two tie rods 5 are threadedly connected, thereby achieving a detachable connection between the two tie rods.

[0058] The first PE pipe 4 structure is as follows Figure 3 As shown, a limiting ring groove 43 is provided on the outer surface of the pipe wall at one end, and a socket ring groove 41 is provided on the outer surface of the pipe wall at the other end. Figure 4 As shown, the inner surface of one end of the other PE pipe 4 is provided with a socket 42, and the outer surface of the other end of the pipe wall is provided with a socket ring groove 41 corresponding to the socket 42. Figure 1The socket ring groove 41 of the front PE pipe 4 and the socket 42 adjacent to the rear PE pipe 4 are connected in a socket connection to realize the detachable connection of the two PE pipes. In order to improve the sealing effect of the socket connection of the two PE pipes, the socket ring groove 41 and the corresponding socket 42 are assembled with interference fit or a small gap. In order to facilitate the socket connection between the socket ring groove 41 and the corresponding socket 42, a guide cone is set at the outermost end of the socket ring groove 41. Before the two PE pipes are assembled, the socket 42 of the rear PE pipe D is first inserted into the guide cone of the front PE pipe to position the rear PE pipe. When the pusher pushes, the guide cone has a guiding function, which can enable the socket ring groove 41 and the socket 42 to be quickly connected.

[0059] Flange 3 structure is as follows Figure 5 As shown, a boss 13 is provided at the center of the flange 3 corresponding to the tie rod 5, and a threaded hole is provided on the boss 13. At the same time, a plurality of clamping blocks 11 are provided at the edge of the end face of the flange 3 corresponding to the limiting ring groove 43 of the first PE pipe 4. The plurality of clamping blocks 11 are evenly arranged along the edge of the flange 3. Figure 1 The external threaded portion 52 of the first tie rod 5 is screwed into the threaded hole of the boss 13, realizing a detachable connection between the tie rod 5 and the flange. After the first PE tube 4 is sleeved onto the outside of the first tie rod, the limiting ring groove 43 of the first PE tube is inserted into the middle of the several clamping blocks 11. The several clamping blocks 11 wrap around the limiting ring groove 43, centering the PE tube and making the first PE tube and the flange 3 concentric. At the same time, it also ensures that the tie rod 5 and the first PE tube are coaxial. It should be noted that in order to facilitate the insertion of the limiting ring groove 43 into the middle of the several clamping blocks 11, a conical surface structure 431 is provided at the front end of the limiting ring groove 43 to facilitate the insertion of the limiting ring groove 43 into the several clamping blocks 11.

[0060] Push plate 8 structure as Figure 6 As shown, the end face of the corresponding PE tube 4 has a socket ring groove 41 protruding from it and a number of clamping blocks 11 are also provided. The several clamping blocks 11 on the push plate 8 are evenly arranged in the circumferential direction. A through hole 12 corresponding to the pull rod 5 is provided at the center of the push plate 8. The pull rod 5 and the through hole 12 are assembled with a gap. The several clamping blocks 11 on the push plate 8 wrap the socket ring groove 41 corresponding to the PE tube 4 inside and center the PE tube 4 so that the PE tube and the pull rod 5 are coaxial to achieve the facing insertion of the two PE tubes.

[0061] The structure of the pusher 6 is as follows: Figure 7As shown, it includes two fixed plates 61 arranged opposite each other. Each fixed plate 61 has a downwardly facing slot 62 corresponding to the pull rod 5. The slot 62 passes through the center of the fixed plate 61. The pusher 6 is inserted into the pull rod 5 through the slot 62. The two fixed plates 61 are connected by two hydraulic cylinders 63 symmetrically arranged on either side of the slot 62. The hydraulic cylinders 63 are arranged below the center of the fixed plates 61. This structure ensures that the pusher 6 and the pull rod 5 are stably engaged, allowing the pusher to perform a stable pushing operation. To facilitate the stable placement of the pusher 6 on the ground or work surface, a flat structure 65 is provided at the bottom of each fixed plate 61. The flat structures 65 of the two fixed plates 61 are located in the same horizontal plane.

[0062] The ejector 6 is matched with a limiting rod 7 , which is inserted into a limiting hole 51 adjacent to the rear end of the ejector 6 . The limiting rod 7 limits the backward movement of the ejector 6 .

[0063] The above is a description of an embodiment of a trenchless repair device for drain pipes. The following describes a method for trenchless repair of drain pipes using the device.

[0064] A drainage trenchless pipe repair construction method, the construction process is as follows Figure 8 As shown, the following steps are included:

[0065] S10. Excavation of foundation pit and installation of auxiliary equipment:

[0066] Cut off the water flow upstream of the drain pipe to prevent water from draining into the drain pipe 1 to be repaired. Dig a first foundation pit 14 at one end of the drain pipe 1 to be repaired and a second foundation pit 15 at the other end. Clean the interior of the drain pipe 1. Install a winch 10 in the first foundation pit 14. Install a pipe joint 2 on the traction rope 9 of the winch 10. Set a flange 3 on the pipe joint 2. Set a lifting device outside the second foundation pit 15 to lift the PE pipe used to repair the drain pipe into the second foundation pit 15.

[0067] S20. Installation of the first PE pipe:

[0068] In the second foundation pit 15, the first tie rod 5 is detachably installed at the center of the flange 3. The first PE pipe 4 is placed outside the first tie rod 5 in the installation direction with its limiting ring groove 43 facing forward and the socket ring groove 41 facing backward. The limiting ring groove 43 is inserted into the several clamping blocks 11 of the flange 3. The several clamping blocks 11 wrap around the limiting ring groove 43. Then, the second tie rod 5 is assembled at the rear end of the first tie rod 5.

[0069] Put the push plate 8 onto the assembled pull rod 5, and make the several clamping blocks 11 of the push plate 8 wrap the socket ring groove 41 of the first PE pipe;

[0070] S30, installation of thruster 6:

[0071] Insert the pusher 6 onto the second pull rod 5 through the slot 62. After installation, the push rod of the hydraulic cylinder 63 of the pusher 6 faces the push plate 8. Insert the limiting rod 7 into the limiting hole 51 provided on the second pull rod 5 and adjacent to the rear end of the pusher 6. The limiting rod 7 limits the rearward movement of the pusher 6.

[0072] S40, threading of the first PE pipe:

[0073] The pusher 6 is turned on, and the push rod of its hydraulic cylinder 63 extends to press the push plate 8. The first PE pipe 4 is clamped and fixed by the push plate 8 and the flange 3. The pusher 6 maintains this pressing state. The winch 10 is activated to pull the first PE pipe 4 into the drainage pipe 1 for a set distance. After the movement, the rear end of the first PE pipe 4 should still be outside the drainage pipe 1.

[0074] After the first PE pipe 4 is threaded, remove the push plate 8, the pusher 6 and the limit rod 7;

[0075] S50, assembly of the next PE pipe:

[0076] Put the next PE pipe 4 on the assembled tie rod 5 in the installation direction with the socket 42 facing forward and the socket ring groove 41 facing backward, and make the socket 42 of the next PE pipe 4 face the socket ring groove 41 of the PE pipe that has been inserted into the drainage pipe;

[0077] Assemble the next tie rod 5 at the rear end of the assembled tie rod 5, and then install the push plate 8, the ejector 6 and the limit rod 7 on the assembled tie rod in sequence, and ensure that the several clamping blocks 11 of the push plate 8 can wrap the socket ring groove 41 of the next PE pipe 4, and the push rod of the ejector 6 is facing the push plate 8;

[0078] The pusher 6 is turned on, and the push rod of its hydraulic cylinder 63 extends out to push the push plate 8, which pushes the next PE pipe 4 forward until its socket 42 is connected with the socket ring groove 41 of the previous PE pipe that has been inserted into the drain pipe, completing the assembly of the next PE pipe and the previous PE pipe;

[0079] S60, threading of assembled PE pipes:

[0080] The pusher 6 maintains its pushing state unchanged, and the winch 10 is activated again, pulling the assembled PE pipe 4 into the drain pipe 1 again by a set distance, and after the movement, the rear end of the next PE pipe 4 is located outside the drain pipe 1;

[0081] After the assembled PE pipe is threaded, remove the push plate 8, the pusher 6 and the limit rod 7;

[0082] S70: Repeat steps S50 and S60 to complete the repair of the drain pipe.

[0083] Repeat the operation of steps S50 and S60 to complete the assembly of several PE pipes for repairing the drainage pipe 1 and the threading of the assembled PE pipes. At this time, the front end of the first PE pipe is exposed from the first foundation pit 14, completing the repair of the drainage pipe in a non-excavation state.

[0084] Preferably, in step S10, the bottom pipe wall of the drainage pipe 1 is retained when the second foundation pit 15 is excavated, or two guide rails are set corresponding to the drainage pipe 1 in the second foundation pit 15 to temporarily support the PE pipe and guide its traction movement when assembling the PE pipe.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A trenchless repair device for buried drainage pipes, characterized by: include: A plurality of PE pipes (4) and a plurality of tie rods (5) are used for repairing a drainage pipe (1); the plurality of PE pipes (4) can be assembled in sequence by splicing, the plurality of tie rods (5) can be assembled in sequence by detachable means, and the total length of the plurality of tie rods (5) after assembly is greater than the total length of the plurality of PE pipes (4) after assembly; and further comprising: A first foundation pit (14) and a second foundation pit (15) are respectively arranged at the two ends of the drainage pipe (1). A winch (10) is arranged in the first foundation pit (14). A pulling rope (9) of the winch (10) is provided with a pipe pulling head (2). The pipe pulling head (2) is connected to the assembled PE pipe (4) and the assembled pull rod (5) through a flange (3). The pull rod (5) passes through the center of the PE pipe (4). Each time the winch (10) pulls the assembled PE pipe (4), the pull rod (5) is pulled out. During the interval of the E-tube threading action, the upper tube of the next PE tube (4) and the next pull rod (5) are assembled in the second foundation pit (15). After the assembly, the tail end of the pull rod (5) extends from the rear end of the PE tube (4). The pull rod (5) is sequentially detachably provided with a push plate (8) and a pusher (6), wherein the push plate (8) is facing the next PE tube (4). The pusher (6) pushes the next PE tube (4) forward through the push plate (8) so that it is connected to the previously assembled PE tube by a socket connection.

2. The trenchless repair device for buried drainage pipes according to claim 1, characterized in that: The two adjacent pull rods (5) are threadedly connected; the flange (3) and the first pull rod (5) are threadedly connected.

3. The trenchless repair device for buried drainage pipes according to claim 1, characterized in that: A limiting ring groove (43) is provided on the outer surface of the pipe wall at one end of the first PE pipe (4), and a socket ring groove (41) is provided on the outer surface of the pipe wall at the other end; a socket opening (42) is provided on the inner surface of the pipe wall at one end of all other PE pipes (4), and a socket ring groove (41) corresponding to the socket opening (42) is provided on the outer surface of the pipe wall at the other end; During assembly, the socket ring groove (41) of the front PE pipe (4) and the socket opening (42) of the rear adjacent PE pipe (4) are connected by socket; The diameter of the flange (3) is the same as the outer diameter of the PE pipe (4); the end face of the flange (3) corresponds to the limiting ring groove (43) of the first PE pipe, and the end face of the push plate (8) corresponds to the socket ring groove (41) of the PE pipe (4) and are respectively protruded with a plurality of clamping blocks (11); the plurality of clamping blocks (11) on the flange (3) wrap the limiting ring groove (43) of the first PE pipe (4) inside; a through hole (12) is provided at the center of the push plate (8); the pull rod (5) and the through hole (12) are assembled with a gap; the plurality of clamping blocks (11) on the push plate (8) wrap the socket ring groove (41) of the corresponding PE pipe (4) inside.

4. The trenchless repair device for buried drainage pipes according to claim 1, characterized in that: The pusher (6) includes two fixed plates (61) arranged opposite to each other. The two fixed plates (61) respectively have downwardly-opened slots (62) corresponding to the pull rod (5). The slots (62) pass through the center of the fixed plates (61). The pusher (6) is inserted into the pull rod (5) through the slots (62). The two fixed plates (61) are connected by two hydraulic cylinders (63) symmetrically arranged on both sides of the slots (62). The hydraulic cylinders (63) are arranged below the center of the fixed plates (61). The pull rod (5) is evenly provided with a plurality of limiting holes (51) in the axial direction, and the pusher (6) is matched with a limiting rod (7). The limiting rod (7) is inserted into a limiting hole (51) adjacent to the rear end of the pusher (6), and the limiting rod (7) limits the backward movement of the pusher (6).

5. The trenchless repair device for buried drainage pipes according to claim 4, characterized in that: A plane structure (65) is respectively provided at the bottom of the two fixing plates (61), and the plane structures (65) of the two fixing plates (61) are located in the same horizontal plane.

6. The trenchless repair device for buried drainage pipes according to claim 4, characterized in that: The pull rod (5) and the PE pipe are of equal length.

7. A drainage pipe repair construction method according to any one of claims 1 to 6, characterized in that: The following steps are involved: S10. Excavation of foundation pit and installation of auxiliary equipment: A first foundation pit (14) is excavated at one end of the drainage pipe (1) to be repaired, and a second foundation pit (15) is excavated at the other end. The interior of the drainage pipe (1) is cleaned. A winch (10) is installed in the first foundation pit (14). A pipe joint (2) is installed on the traction rope (9) of the winch (10). A flange (3) is provided on the pipe joint (2). A lifting device is provided outside the second foundation pit (15) to lift the PE pipe used for repairing the drainage pipe into the second foundation pit (15). S20. Installation of the first PE pipe: The first tie rod (5) is detachably installed at the center of the flange (3) in the second foundation pit (15), and the first PE pipe (4) is sleeved on the outside of the first tie rod (5) in the installation direction with its limiting ring groove (43) facing forward and the socket ring groove (41) facing backward, and the limiting ring groove (43) is inserted into several clamping blocks (11) of the flange (3), and several clamping blocks (11) wrap the limiting ring groove (43), and then the second tie rod (5) is assembled at the rear end of the first tie rod (5); Put the push plate (8) on the assembled pull rod (5), and make the several clamping blocks (11) of the push plate (8) wrap the socket ring groove (41) of the first PE pipe; S30, installation of the thruster: The pusher (6) is inserted into the second pull rod (5) through the slot (62). After installation, the push rod of the hydraulic cylinder (63) of the pusher (6) faces the push plate (8). The limiting rod (7) is inserted into the limiting hole (51) provided on the second pull rod (5) and adjacent to the rear end of the pusher (6). The limiting rod (7) limits the rearward movement of the pusher (6); S40, threading of the first PE pipe: The pusher (6) is opened, and the push rod of the hydraulic cylinder (63) thereof extends to press the push plate (8). The first PE pipe (4) is clamped and fixed by the push plate (8) and the flange (3). The pusher (6) maintains the pressing state unchanged, and the winch (10) is operated to pull the first PE pipe (4) into the drainage pipe 1 by a set distance. After the movement, the rear end of the first PE pipe (4) is still located outside the drainage pipe (1). After the first PE pipe (4) is threaded, the push plate (8), the pusher (6) and the limit rod (7) are removed; S50, assembly of the next PE pipe: Put the next PE pipe (4) on the assembled tie rod (5) in the installation direction with the socket (42) facing forward and the socket ring groove (41) facing backward, and make the socket (42) of the next PE pipe (4) face the socket ring groove (41) of the PE pipe that has been inserted into the drainage pipe; Assemble the next pull rod (5) at the rear end of the assembled pull rod (5), and then install the push plate (8), the pusher (6) and the limit rod (7) in sequence on the assembled pull rod, and ensure that the several clamping blocks (11) of the push plate (8) can wrap the socket ring groove (41) of the next PE pipe (4), and the push rod of the pusher (6) is facing the push plate (8); The pusher (6) is opened, and the push rod of the hydraulic cylinder (63) thereof extends out to push the push plate (8), and the push plate (8) pushes the next PE pipe (4) forward until its socket (42) and the socket ring groove (41) of the previous PE pipe that has been inserted into the drainage pipe are connected in a socket manner, thereby completing the assembly of the next PE pipe and the previous PE pipe; S60, threading of assembled PE pipes: The pusher (6) maintains its pushing state unchanged, and the winch (10) is activated again, pulling the assembled PE pipe (4) into the drain pipe (1) again by a set distance, and after the movement, the rear end of the next PE pipe (4) is located outside the drain pipe (1); After the assembled PE pipe is threaded, remove the push plate (8), the pusher (6) and the limit rod (7); S70: Repeat steps S50 and S60 to complete the repair of the drain pipe. Repeat steps S50 and S60 to sequentially complete the assembly of several PE pipes for repairing the drainage pipe (1) and the threading of the assembled PE pipes. At this time, the front end of the first PE pipe is exposed from the first foundation pit (14), completing the repair of the drainage pipe in a trenchless state.

8. The drainage pipe repair construction method of the trenchless repair device according to claim 7, characterized in that: In step S10, the bottom pipe wall of the drainage pipe (1) is retained when the second foundation pit (15) is excavated, or two guide rails are provided corresponding to the drainage pipe (1) in the second foundation pit (15) to temporarily support the PE pipe and guide its traction movement when assembling the PE pipe.

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