Device for restoring collapsed sections of existing drainage pipes, unit for restoring collapsed sections of existing drainage pipes, method for restoring collapsed sections of existing drainage pipes, and method for repairing collapsed sections of existing drainage pipes after restoration.

Abstract

It can be installed in the narrow space below the collapsed section of an existing drainpipe, exerting a large upward force to push the collapsed section back to its original position before the collapse. [Solution] The restoration device 1 comprises a base plate 2 that sits on the opposite surface R of the collapsed portion Q of the existing drain pipe P, a collapsed portion push-up plate 3, a plurality of connecting guides 4 that are connected so that the two plates can move closer together and further apart, and which move closer together so that the collapsed portion push-up plate 3 does not interfere with the collapsed portion Q when inserted into the existing drain pipe P, and a hydraulic cylinder 5 which is a push-up driving means provided on the base plate 2 that pushes up the collapsed portion Q with the collapsed portion push-up plate 3 to restore it to a position that matches the inner surface of the existing drain pipe P. The collapsed portion Q is concealed by two semi-cylindrical protective cylinders, and the push-up driving means 5 is activated to raise the collapsed portion push-up plate 3 until it contacts the inner surface of the existing drain pipe P, thereby pushing the collapsed portion Q back to its original position before collapse.

Description

Technical Field

[0001] The present invention relates to a restoration device for a sunken part of an existing drainage pipe, a method for restoring a sunken part of an existing drainage pipe, and a repair method after restoring a sunken part of an existing drainage pipe.

Background Art

[0002] Conventionally, regarding the connection part between an existing drainage pipe and an attachment pipe (branch pipe), for the repair method of a water leakage part where the attachment pipe protrudes into the existing drainage pipe and the periphery of the attachment pipe of the existing drainage pipe is damaged, for example, the repair method shown in Patent Document 1 is applied. This repair method involves cutting off the protruding part of the attachment pipe into the existing drainage pipe, temporarily closing the opening of the remaining attachment pipe with an airship (a bag inflated with gas), then arranging a formwork on the inner surface of the pipe including the periphery of the attachment pipe of the existing drainage pipe, injecting and curing a repair resin material through a through hole, and then removing the formwork and polishing the periphery of the repair resin material.

[0003] On the other hand, in many cases, the damaged part of the existing drainage pipe is a sunken part due to the upper earth pressure. And the sunken part is accompanied by cracks. The method for repairing the sunken part of the existing drainage pipe is, for example, to provide a vertical shaft with a diameter of 1.5 - 2.0 m to expose the sunken part of the existing drainage pipe, cut off, for example, a length of 1.0 m with the sunken part as the central position, position a new pipe at the cutting position and support it appropriately from the outside, and perform connection and sealing with the existing drainage pipe at both ends of the new pipe. In this case, it is necessary to ensure connection strength and a high sealing function.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

[0005] The inventors of this application conceived of a method to repair a collapsed section of an existing drainpipe accompanied by cracks: (1) restoring the collapsed section to its original position, and (2) attaching a formwork that creates a thin-walled space on the inner and outer surfaces of the pipe to conceal the collapsed section, and filling it with a leak-preventive agent. Therefore, this time, we have worked on developing a technology to push the collapsed section of an existing drainpipe back to its original (pre-collapse) position.

[0006] The present invention was made to solve these problems and aims to provide a device for restoring a collapsed section of an existing drain pipe, a method for restoring a collapsed section of an existing drain pipe, and a method for repairing a collapsed section of an existing drain pipe after restoration, which can be installed in the narrow space below the collapsed section of an existing drain pipe and exert a large upward force to push the collapsed section back to its original position before collapse. [Means for solving the problem]

[0007] A restoration device for a collapsed section of an existing drain pipe according to a first aspect of the present application is a restoration device for a collapsed section of an existing drain pipe that is inserted through a manhole to a position corresponding to the collapsed section in the existing drain pipe and pushes the collapsed section back to its original position before collapse, comprising: a base plate having a seating surface that sits on the opposing surface of the collapsed section of the existing drain pipe; a collapsed section pushing plate having a cylindrical convex surface with a required radius of curvature; a plurality of connecting guides provided in such a state that the opposing surfaces of the base plate and the collapsed section pushing plate can be moved closer to and further apart from each other, and which move closer together so that the collapsed section pushing plate does not interfere with the collapsed section when inserted into the existing drain pipe; and a pushing drive means provided on the base plate that pushes the collapsed section with the collapsed section pushing plate and restores it to a position that matches the inner surface of the existing drain pipe.

[0008] In a second aspect of the present invention, the push-up driving means may include a plurality of hydraulic cylinders provided to connect the base plate and the recessed portion push-up plate, a hydraulic control unit installed on the ground, and a pressurized oil supply hose extending from the hydraulic control unit and connected to the hydraulic cylinders through the manhole and the existing drain pipe.

[0009] In a third aspect of the present application, in the first aspect described above, the push-up driving means comprises two angle-threaded hanging bolts, each with its upper end fixed at two positions spaced apart in the tubular direction of the recessed portion push-up plate and its lower end hanging down to a position close to the base plate; two sprocket-equipped nut blocks, each with a central hole that screws into each of the angle-threaded hanging bolts, the female angle-threaded portion being screwed onto the upper part of the angle-threaded hanging bolts and the outer circumference being a sprocket portion; and a lower end fixed to the base plate and each of the sprockets at its upper end. The system comprises two nut block support stands that rotatably support the rocket-equipped nut blocks, and a chain winding mechanism that meshes with the sprocket portion and rotates the two sprocket-equipped nut blocks. It may also include a reduction gear installed on the base plate with its output shaft connected to the sprocket rotation shaft on the manhole side of the chain winding mechanism, a servo motor installed on the base plate with its output shaft connected to the input shaft of the reduction gear, and a control unit for the servo motor installed on the ground.

[0010] In a fourth aspect of the present invention, in the first embodiment described above, the push-up driving means comprises two square-threaded lifting bolts whose upper ends are fixed at two positions in the pipe direction of the recessed portion push-up plate and whose lower ends hang down to a position close to the base plate; two geared nut blocks having a female square-threaded portion in the center that screws onto each of the square-threaded lifting bolts and a helical follower gear portion on the outer circumference; two support stands whose lower ends are fixed to the base plate and which rotatably support each of the geared nut blocks so that each of the geared nut blocks screws onto the upper part of the square-threaded lifting bolts at a fixed height; and a horizontal shaft having a helical main gear portion that meshes with each of the helical follower gear portions without separation. Furthermore, the means may also include a reduction gear installed on the base plate with an output shaft connected to the manhole-side end of the horizontal shaft; a servo motor installed on the base plate with an output shaft connected to the input shaft of the reduction gear; and a servo motor control unit installed on the ground.

[0011] In a fifth aspect of the present application, in the first embodiment described above, the push-up driving means is: Two pairs of bendable links connect the base plate and the recessed portion push-up plate at two positions in the direction of the pipe, A right-hand square screw nut block connected by a pin shaft to the bent portion of one of the bent links, and a left-hand square screw nut block connected by a pin shaft to the bent portion of the other bent link, The device may also include a reduction gear installed on the base plate with an output shaft connected to the manhole-side end of the horizontal screw shaft, a servo motor installed on the base plate with an output shaft connected to the input shaft of the reduction gear, and a control unit for the servo motor installed on the ground.

[0012] As a sixth aspect of the present application, in any one of the first to fifth aspects described above, two protective cylinders may be provided, which are semi-cylindrical in shape, with an inner radius of curvature equal to the outer radius of curvature of the existing drain pipe, and which are bolted together to conceal the recessed portion of the existing drain pipe from the outside.

[0013] To achieve the above objective, the method for restoring a collapsed section of an existing drain pipe according to the seventh aspect of the present application involves excavating a vertical shaft to expose the collapsed section of the existing drain pipe, concealing the collapsed section with two semi-cylindrical protective tubes whose inner radius of curvature is equal to the outer radius of curvature of the existing drain pipe, inserting a restoration device for a collapsed section of an existing drain pipe according to any one of the first to fifth aspects into the existing drain pipe through a manhole and positioning it at a location corresponding to the collapsed section, activating the push-up driving means provided in the collapsed section restoration device to press the collapsed section push-up plate against the collapsed section, and raising the collapsed section push-up plate until it contacts the inner surface of the existing drain pipe, thereby pushing the collapsed section back to its original position before collapse.

[0014] To achieve the above objective, the method for restoring a collapsed section of an existing drain pipe according to the eighth aspect of the present application involves first pushing the collapsed section back to its original position before collapse using the method for restoring a collapsed section of an existing drain pipe according to the seventh aspect, then removing the two-part protective cylinder, attaching a formwork that creates a thin-walled space on the inner and outer surfaces of the pipe to conceal the collapsed section with the support of appropriate support means, filling the formwork with a water leakage prevention hardening agent through injection holes provided in the formwork, removing the formwork after the hardening agent has hardened, and backfilling the vertical shaft. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a device for restoring a collapsed section of an existing drain pipe, a method for restoring a collapsed section of an existing drain pipe, and a method for repairing a collapsed section of an existing drain pipe after restoration, which can be installed in the narrow space below the collapsed section of an existing drain pipe and exert a large upward force to push the collapsed section back to its original position before collapse. [Brief explanation of the drawing]

[0016] [Figure 1] It is an explanatory diagram showing a restoration device according to a first embodiment of the present invention and a method for restoring a sunken portion of an existing drain pipe. FIG. 1(A) is a diagram showing a state where the restoration device is inserted below the sunken portion, FIG. 1(B) is a diagram showing a state where the sunken portion is pushed up by the restoration device, and FIG. 1(C) is a diagram showing a state where the restoration device is removed and a formwork is attached and a leak-preventing hardener is filled. [Figure 2] It is a longitudinal sectional view showing a shaft pit excavated when implementing a method for restoring a sunken portion of an existing drain pipe according to a first embodiment of the present invention. [Figure 3] Regarding the restoration device for a sunken portion of an existing drain pipe according to the first embodiment of the present invention, FIG. 3(A) is a longitudinal sectional view along the center line of the pipe showing a state where the restoration device is inserted below the sunken portion. FIG. 3(B) is a sectional view taken along line IIIA-IIIA in FIG. 3(A). FIG. 3(C) is a longitudinal sectional view showing a state where the sunken portion is pushed up by the restoration device. FIG. 3(D) is a sectional view taken along line IIID-IIID in FIG. 3(C). [Figure 4] It is an explanatory diagram showing a restoration device according to a second embodiment of the present invention and a method for restoring a sunken portion of an existing drain pipe. [Figure 5A] It is a longitudinal sectional view along the center line of the pipe showing a state where the restoration device for a sunken portion of an existing drain pipe according to the second embodiment of the present invention is inserted below the sunken portion. [Figure 5B] It is a longitudinal sectional view showing a state where the sunken portion is pushed up by the restoration device for a sunken portion of an existing drain pipe according to the second embodiment of the present invention. [Figure 6A] It is a longitudinal sectional view along the center line of the pipe showing a state where the restoration device for a sunken portion of an existing drain pipe according to the third embodiment of the present invention is inserted below the sunken portion. [Figure 6B] It is a longitudinal sectional view showing a state where the sunken portion is pushed up by the restoration device for a sunken portion of an existing drain pipe according to the third embodiment of the present invention. [Figure 7A] It is a longitudinal sectional view along the center line of the pipe showing a state where the restoration device for a sunken portion of an existing drain pipe according to the fourth embodiment of the present invention is inserted below the sunken portion. [Figure 7B]It is a longitudinal sectional view showing a state in which a sunken part of an existing drainage pipe is pushed up by a restoration device according to a fourth embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0017] Hereinafter, a restoration device for a sunken part of an existing drainage pipe, a method for restoring a sunken part of an existing drainage pipe, and a repair method after restoring a sunken part of an existing drainage pipe according to the present invention will be described with reference to the drawings.

[0018] First, a method for restoring a sunken part of an existing drainage pipe according to a first embodiment of the present invention will be briefly described with reference to FIG. 1. As shown in FIG. 1(A), a camera is inserted into the existing drainage pipe P through the manhole M to identify the position of the sunken part Q, a shaft pit H is dug down to expose the sunken part Q of the existing drainage pipe P, and two half protection cylinders 10 are bolted together so as to conceal the sunken part Q of the existing drainage pipe P from the outside. Then, the restoration device 1 is inserted into the inside of the sunken part Q in the existing drainage pipe P through the manhole M. The restoration device 1 is inserted into the pipe depth while adding the insertion support rod 14. Thus, the sunken part Q is pushed up to the original position before sinking by the restoration device 1. And, as shown in FIG. 1(B), after the sunken part Q is pushed up to the original position before sinking by the restoration device 1, as shown in FIG. 1(C), the formworks 11 and 12 are installed and the leak prevention hardening agent 15 is filled. After the hardening agent 15 is hardened and the formwork is removed, the shaft pit H is backfilled.

[0019] FIG. 2 shows a place where a retaining wall is constructed so that the wall surface does not collapse when digging down the shaft pit H. For example, every time the support 16 formed by connecting a plurality of ring-shaped members in a ring shape with a connecting part having a function of increasing the connecting length after connection is dug down by 50 cm, it is installed so as to be suspended and supported. And, the sheet piles 17 are inserted so as to be arranged in the circumferential direction so as to be pressed against the hole wall by the upper and lower supports 16. Then, the connecting length of the connecting part of the support 16 is increased to expand the ring diameter, and the support 16 presses the sheet piles 17 against the wall surface of the shaft pit H.

[0020] [First Embodiment of the Restoration Device] Figure 3 shows a restoration device 1 for a collapsed section of an existing drain pipe according to the first embodiment. As shown in Figures 1 and 3, this restoration device 1 is inserted through a manhole M into a position corresponding to the collapsed section Q in the existing drain pipe P and is equipped with a restoration device 1 that pushes the collapsed section Q back to its original position before collapse. This restoration device 1 has a configuration in which a base plate 2 and a collapsed section pushing plate 3 are connected by multiple (four on all four sides) connecting guides 4 so that they can be moved closer to and further away from each other. This configuration is the same in the second to fourth embodiments described later. This restoration device 1 includes a pushing-up driving means 5 consisting of three hydraulic cylinders at a position surrounded by the connecting guides 4. In the second to fourth embodiments described later, a mechanical structure is employed for the pushing-up driving means.

[0021] The base plate 2 has a seating surface 2a that sits on the opposing surface R of the recessed portion Q of the existing drain pipe P. The seating surface 2a is preferably a cylindrical surface whose lower radius of curvature is equal to the radius of curvature of the inner surface of the existing drain pipe P, so that it fits tightly against the opposing surface R. If the diameter size of the existing drain pipe P is different, the radius of curvature of the seating surface 2a will also be different accordingly.

[0022] The recessed portion push-up plate 3 has a cylindrical convex surface 3a with a required radius of curvature on the surface that pushes up the recessed portion Q of the existing drain pipe P. The recessed portion push-up plate 3 is preferably a cylindrical surface whose radius of curvature is equal to the radius of curvature of the inner surface of the existing drain pipe P, so that when it pushes up the recessed portion Q of the existing drain pipe P, it adheres tightly to the inner surface of the existing drain pipe P and cannot be pushed up any further. If the diameter size of the existing drain pipe P is different, the radius of curvature of the cylindrical convex surface 3a will also be different accordingly.

[0023] The connecting guide 4 plays the role of connecting the recessed section push-up plate 3 to the base plate 2 so that it can approach and separate from the base plate 2 without changing its opposing direction. For this reason, multiple connecting guides 4 are provided, for example, to connect at the four corners of the base plate 2 and the recessed section push-up plate 3. Each connecting guide 4 is, for example, a cylindrical guide 4a erected from the base plate 2, which has the function of receiving the lifting rod 4b hanging down from the recessed section push-up plate 3 and guiding it to move up and down without lateral swaying. The cylindrical guide 4a and the lifting rod 4b may be installed upside down. When the push-up driving means 5 described below is in a retracted state, the connecting length between the cylindrical guide 4a and the lifting rod 4b of each connecting guide 4 is shortened, thereby ensuring that the recessed section push-up plate 3 enters the lower position of the recessed section Q so as not to interfere with the recessed section Q when inserted into the existing drain pipe P.

[0024] The push-up driving means 5 consists of, for example, three units installed in the center of the width of the base plate 2 and aligned in the direction of the pipe. By pushing up the recessed portion push-up plate 3, the recessed portion push-up plate 3 pushes up the recessed portion Q, restoring the recessed portion Q to a position where the recessed portion push-up plate 3 aligns with the inner surface of the existing drain pipe P (see Figure 1(B)). In this embodiment, the push-up driving means 5 uses a hydraulic cylinder provided to connect the base plate 2 and the recessed portion push-up plate 3. When the hydraulic cylinder 5 extends, the recessed portion push-up plate 3 is pushed up, and the reaction force generated on the base plate 2 is received by the inner bottom surface R of the existing drain pipe P. To drive the extension and retraction of the hydraulic cylinder 5, there is a hydraulic control unit 6 installed on the ground and a pressurized oil supply hose 7 extending from the hydraulic control unit 6 and connected to the hydraulic cylinder 5 through the manhole M and the existing drain pipe P.

[0025] [Method for restoring collapsed sections of existing drainage pipes] As shown in Figure 1(A), the shaft H is excavated to expose the collapsed portion Q of the existing drain pipe P. Two semi-cylindrical protective cylinders 10, whose inner radius of curvature is equal to the outer radius of curvature of the existing drain pipe P, are fitted together and bolted to conceal the collapsed portion Q. After removing the soil from inside the existing drain pipe P via the manhole M, the restoration device 1 is inserted into the existing drain pipe P and positioned to correspond to the collapsed portion Q. A hydraulic control unit 6 is controlled above ground to extend the hydraulic cylinder 5, which is the pushing-up drive means, pressing the collapsed portion pushing-up plate 3 against the collapsed portion Q. Further raising the collapsed portion pushing-up plate 3 until it contacts the inner surface of the existing drain pipe P pushes the collapsed portion Q back to its original position before collapse. In this case, to prevent the collapsed portion Q from returning in the direction of collapse, the upper surface of the collapsed portion pushing-up plate 3 may be raised by, for example, 2-4 mm. Furthermore, a camera 18 may be installed at a required position on the restoration device 1 to capture images of the collapsed section push-up plate 3 pressing against the collapsed section Q and the collapsed section push-up plate 3 contacting the inner surface (top surface) of the existing drain pipe P, so that the images can be captured on the ground. In addition, a sensor may be installed to stop the extension operation of the hydraulic cylinder 5 when the collapsed section push-up plate 3 contacts the inner surface (top surface) of the existing drain pipe P.

[0026] In this restoration method, excavating the vertical shaft H to expose the collapsed portion Q of the existing drainage pipe P is done because the collapse of the portion Q is often caused by soil pressure or contact with other buried pipes, and the vertical shaft H is provided to eliminate the cause, as it is difficult to push up the collapsed portion Q with the collapsed portion push-up plate 3 without removing the soil pressure. Furthermore, concealing the collapsed portion Q with the two protective cylinders 10 as described above is effective in preventing the collapsed portion Q from unexpectedly protruding significantly beyond the outer surface of the existing drainage pipe P.

[0027] [Repair methods after restoration of collapsed sections of existing drainage pipes] Remove the two-part protective tube 10 shown in Figure 1(B), and as shown in Figure 1(C), attach formwork 11 and 12, which create a thin-walled space on the inner and outer surfaces of the pipe so as to conceal the recessed area Q, using appropriate support means. Fill the formwork 11 and 12 with a water-leakage-preventing hardening agent 15, such as epoxy, through the injection holes provided in the formwork 11 and 12. After the hardening agent has cured, remove the formwork 11 and 12 and backfill the shaft H. Alternatively, the protective tube 10 may be attached after removing the formwork 11 and 12 and then the shaft H may be backfilled.

[0028] [Second embodiment of the restoration device] Figure 2 shows a restoration device 1A for a collapsed section of an existing drainpipe according to a second embodiment of the present invention. This restoration device 1A comprises a base plate 2A, a collapsed section pushing plate 3A, a plurality of connecting guides 4A, and a pushing drive means 5A. The base plate 2A, the collapsed section pushing plate 3A, and the connecting guides 4A are substantially the same as those shown in the first embodiment.

[0029] The push-up driving means 5A is a mechanical mechanism different from that of the second embodiment, and comprises two square-threaded hanging bolts 5a whose upper ends are fixed at two positions required to be spaced apart in the tubular direction of the recessed portion push-up plate 3A and whose lower ends hang down to a position close to the base plate 2A, two sprocketed nut blocks 5b whose central holes are female square-threaded portions 5b1 that are screwed into each square-threaded hanging bolt 5a and whose outer circumference is a sprocket portion 5b2, and whose lower ends are fixed to the base plate 2A The device comprises two nut block support stands 5c that support each sprocket-equipped nut block 5b at its upper end in a rotatable and height-fixed manner, a bracket 5d1 installed on the base plate 2A on the manhole side of the two nut block support stands 5c, a sprocket 5d2 provided on the bracket 5d1, an endless chain 5d3 wrapped around the sprocket 5d2 and the two sprocket-equipped nut blocks 5b, and a chain winding mechanism 5d consisting of a gear train 5d4 connected to the sprocket 5d2. The gear train 5d4 includes two bevel gears and two spur gears.

[0030] Furthermore, the restoration device 1A includes a reduction gear 8A mounted on a base plate 2A with its output shaft connected to a gear train 5d4, a servo motor 9A mounted on the base plate 2A with its output shaft connected to the input shaft of the reduction gear 8A, and a servo motor control unit 13A installed on the ground. Note that the gear train 5d4 can also be considered as part of the reduction gear.

[0031] In the second embodiment, the restoration device 1A is installed on a base plate 2A, with the servo motor control unit 13A excluded from the restoring device 1A. The entire device is inserted when the base plate 2A is inserted into the existing drain pipe P.

[0032] [Method for restoring collapsed sections of existing drainage pipes] The vertical shaft H is excavated to expose the collapsed section Q of the existing drain pipe P. The collapsed section Q is concealed by two semi-cylindrical protective cylinders 10 whose inner radius of curvature is equal to the outer radius of curvature of the existing drain pipe P. The restoration device 1A is inserted into the existing drain pipe P through the manhole M, and the collapsed section pushing plate 3A is positioned to correspond to the collapsed section Q. A servo motor control unit 13A is controlled above ground to drive the servo motor 9A. When the servo motor 9A is driven, the motor's torque is increased by the reduction gear 8A, and the increased torque causes the endless chain 5d3 of the chain winding mechanism 5d to move, causing two sprocket-equipped nut blocks 5b to rotate in the same direction with high torque at a fixed height, and causing two angle-threaded hanging bolts 5a to rise, which in turn pushes up the collapsed section pushing plate 3A. Furthermore, by raising the collapsed section pushing plate 3A until it contacts the inner surface of the existing drain pipe P, the collapsed section Q can be pushed back to its original position before collapse.

[0033] [Repair methods after restoration of collapsed sections of existing drainage pipes] This is the same as in the first embodiment of the present invention.

[0034] [Third embodiment of the restoration device] Figures 6A and 6B show a restoration device 1B for a collapsed section of an existing drainpipe according to a third embodiment of the present invention. This restoration device 1B comprises a base plate 2B, a collapsed section pushing plate 3B, a plurality of connecting guides 4B, and a pushing drive means 5B. The base plate 2B, the collapsed section pushing plate 3B, and the connecting guides 4B are substantially the same as those shown in the first embodiment.

[0035] The push-up drive means 5B comprises two square-threaded lifting bolts 5e whose upper ends are fixed at two positions in the tubular direction of the recessed lifting plate 3B and whose lower ends hang down to a position close to the base plate 2B; two geared nut blocks 5f having a female square-threaded portion 5f1 in the center that screws onto the upper part of each square-threaded lifting bolt 5e and a helical follower gear portion 5f2 on the outer circumference; two support stands 5g that rotatably support the geared nut blocks 5f whose lower ends are fixed to the base plate 2B and whose upper parts screw onto the square-threaded lifting bolts 5e; and a horizontal shaft 5h having a helical main gear portion 5h1 that meshes with the helical follower gear portion 5f2 of the geared nut block 5f in a manner that does not separate. The horizontal shaft 5h is supported at both ends by a motor bracket 5i and a horizontal shaft bracket 5j.

[0036] Furthermore, the restoration device 1B includes a reduction gear 8B mounted on a motor bracket 5i installed on a base plate 2B, with its output shaft connected to the manhole-side end of the horizontal axis 5h; a servo motor 9B installed on the base plate 2B, with its output shaft connected to the input shaft of the reduction gear 8B; and a servo motor control unit (not shown) installed on the ground.

[0037] In the fourth embodiment, the restoration device 1B is mounted on a base plate 2B, with the portion excluding the servo motor control unit mounted on the base plate 2B. The entire device is inserted when the base plate 2B is inserted into the existing drain pipe P.

[0038] [Method for restoring collapsed sections of existing drainage pipes] The vertical shaft H is excavated to expose the collapsed section Q of the existing drain pipe P, the collapsed section Q is concealed by two semi-cylindrical protective cylinders 10 whose inner radius of curvature is equal to the outer radius of curvature of the existing drain pipe P, the restoration device 1B is inserted into the existing drain pipe P through the manhole M, and the collapsed section lifting plate 3B is positioned to correspond to the collapsed section Q, and the servo motor 9B is driven by controlling the servo motor control unit on the ground to raise it, which pushes up the collapsed section lifting plate 3B, and by raising the collapsed section lifting plate 3B until it contacts the inner surface of the existing drain pipe P, the collapsed section Q can be pushed back to its original position before collapse.

[0039] [Repair methods after restoration of collapsed sections of existing drainage pipes] This is the same as in the first embodiment of the present invention.

[0040] [Fourth embodiment of the restoration device] Figures 7A and 7B show a restoration device 1C for a collapsed section of an existing drain pipe according to a fourth embodiment of the present invention. This restoration device 1C comprises a base plate 2C, a collapsed section lifting plate 3C, connecting guides 4C that connect the four corners of the base plate 2C and the collapsed section lifting plate 3C and are arranged to be able to move closer to and away from each other, and a lifting drive means 5C located in the center of the width of the base plate 2C. The base plate 2C, the collapsed section lifting plate 3C, and the connecting guides 4C are substantially the same as those shown in the first embodiment.

[0041] The push-up drive means 5C of this embodiment includes two pairs of bent links 5k, 5k that connect the base plate 2C and the recessed portion push-up plate 3C at two positions along the center of the pipe in the direction of the pipe, a right-hand square screw nut block 5m and a left-hand square screw nut block 5n that are screw-rotatable as nuts, and a horizontal screw shaft 5p. The threaded portions of the right-hand square screw nut block 5m, the left-hand square screw nut block 5n and the horizontal screw shaft 5p are square threads of the required pitch and size that are sufficiently safe in terms of strength.

[0042] Each bending link 5k, 5k is formed by connecting two links and can be bent into a "V" shape. The two pairs of bending links 5k, 5k are arranged symmetrically in the direction of the pipe.

[0043] The right-hand square screw nut block 5m is rotatably connected to a pin shaft 5r located at the bend of one of the bending links 5k. The left-hand square screw nut block 5n is rotatably connected to a pin shaft 5r located at the bend of the other bending link 5k. Note that the pin shafts 5q and 5r may protrude from the nut blocks instead of the bending links, in which case they are rotatably connected to the bending links.

[0044] The horizontal screw shaft 5p has a male right-hand threaded portion 5p1 that is screwed into the nut portion (female right-hand threaded portion) at the center of the right-hand square screw nut block 5m, and a male left-hand threaded portion 5p2 that is screwed into the nut portion (female left-hand threaded portion) at the center of the left-hand square screw nut block 5n. The horizontal screw shaft 5p has a male right-hand threaded portion 5p1 and a male left-hand threaded portion 5p2 and is fixed so as not to move in the axial direction, and its height changes in conjunction with the bending and extending of the two bending links 5k, 5k.

[0045] When the horizontal screw shaft 5p is driven and rotated in the required direction, the right-hand square screw nut block 5m and the left-hand square screw nut block 5n move closer to each other, and in conjunction with this, the bent portions of the two bending links 5k, 5k move closer to each other, so that the two bending links 5b connecting the base plate 2C and the recessed area lifting plate 3C extend to reduce the bending angle and can lift the recessed area lifting plate 3C. What is important in the mechanical lifting drive means 5C is that the diameter of the horizontal screw shaft 5p, the length and size of the square screw, and the bending links 5k, 5k are designed to have sufficient strength.

[0046] The existing drain pipe collapse restoration device 1C further includes a reduction gear 8C supported by a motor bracket 5t installed on a base plate 2C, with its output shaft connected to the manhole-side shaft end of a horizontal screw shaft 5p via a universal joint 5s, a servo motor 9C installed on the base plate 2C with its output shaft connected to the input shaft of the reduction gear 8C, and a servo motor control unit (not shown) installed on the ground.

[0047] In the second embodiment, the restoration device 1C is installed on a base plate 2C, with the portion excluding the servo motor control unit mounted on it. The entire device is inserted when the base plate 2C is inserted into the existing drain pipe P. The differences from the restoration device 1 of the first embodiment are that the ground control is performed by a servo motor control unit instead of a hydraulic control unit, and a mechanical mechanism is used that extends two pairs of bending links 5k, 5k to increase the bending angle and push up the recessed section push-up plate 3C instead of a hydraulic cylinder.

[0048] [Method for restoring collapsed sections of existing drainage pipes] The vertical shaft H is excavated to expose the collapsed portion Q of the existing drain pipe P, and the collapsed portion Q is concealed by two semi-cylindrical protective cylinders 10 whose inner radius of curvature is equal to the outer radius of curvature of the existing drain pipe P. The restoration device 1C is inserted into the existing drain pipe P through the manhole M, and the collapsed portion pushing plate 3C is positioned to correspond to the collapsed portion Q. A servo motor control unit is controlled on the ground to drive the servo motor 9C, which rotates the horizontal screw shaft 5p and extends the two pairs of bent links 5k, 5k that constitute the pushing-up driving means 5C, pressing the collapsed portion pushing plate 3C against the collapsed portion Q. Further raising the collapsed portion pushing plate 3C until it contacts the inner surface of the existing drain pipe P pushes the collapsed portion Q back to its original position before collapse.

[0049] In this configuration, the output torque of the servo motor 9C is increased by a multiple that is the reciprocal of the reduction ratio in the reduction gear 8C, and further torque is increased by screwing the horizontal screw shaft 5p with the right-hand square screw nut block 5m and the left-hand square screw nut block 5n, and finally the torque is increased by extending the two pairs of bending links 5k, 5k, so that the recessed section lifting plate 3C can lift the recessed section Q.

[0050] [Repair methods after restoration of collapsed sections of existing drainage pipes] This is the same as in the first embodiment of the present invention.

[0051] According to the present invention, the device for restoring a collapsed section of an existing drain pipe, the method for restoring a collapsed section of an existing drain pipe, and the method for repairing a collapsed section of an existing drain pipe after restoration, the device can be installed in the narrow space below the collapsed section of the existing drain pipe, exert a large upward force to push the collapsed section back to its original position before collapse. The collapsed section, once pushed back to its original position, allows the leak-preventive agent to penetrate the cracks and function as a strong structural frame.

[0052] Existing drainage pipes come in various inner diameters such as 160mm, 200mm, 250mm, 300mm, ..., and 600mm. To accommodate these sizes, the radius of curvature of the lower surface of the base plate, the radius of curvature of the upper surface of the recessed area push-up plate, the length of the connecting guide, and the stroke of the push-up drive mechanism are appropriately set. [Industrial applicability]

[0053] The present invention provides a device for restoring collapsed sections of existing drainage pipes, a method for restoring collapsed sections of existing drainage pipes, and a method for repairing collapsed sections of existing drainage pipes after restoration. These inventions can be widely used in the drainage pipe industry, are superior in terms of safety and convenience, and are highly applicable to industrial use. [Explanation of Symbols]

[0054] 1, 1A, 1B, 1C...restoring device 2, 2A, 2B, 2C… Base Plate 2a...Seating surface part 3, 3A, 3B, 3C... Plates to push up the depressed area 3a...Cylindrical convex surface 4, 4A, 4B, 4C… Connecting guides 4a...Cylindrical guide 4b… Lifting rod 5. Hydraulic cylinder (pushing drive mechanism) 5A, 5B, 5C... Push-up drive mechanism (mechanical mechanism) 5a...Angle threaded hanging bolt 5b... Nut block with sprocket 5b1... Female square thread section 5b2... Sprocket section 5c...Nut block support stand 5d... Chain winding mechanism 5d1…bracket 5d2... Sprocket 5d3... Endless chain 5d4...Gear train 5e... Lifting bolt with square thread 5f... Nut block with gears 5f1... Female square thread section 5f2...Hasser gear section 5g…Support stand 5h…Horizontal axis 5h1...Hasuba Original Gear Division 5i…Motor bracket 5j... Horizontal axis bracket 5k...flexible link 5m... Right-hand corner screw nut block 5n... Left-hand corner screw nut block 5p…Horizontal screw shaft 5p1...Male right-hand thread section 5p2...Male left-hand thread section 5q, 5r... pin axis 5s... Flexible joint, 5t...motor bracket 6… Hydraulic control unit 7. Pressurized oil supply hose 8A, 8B, 8C...Reducer 9A, 9B, 9C... Servo motors 10...Protective tube 11, 12... formwork 13A…Control unit for servo motors 14…Support culm for insertion 15…Hardening agent for preventing water leakage 16…Shoring 17…Yaita 18... Camera 19A... Communication cable

Claims

1. A device for restoring a collapsed section of an existing drain pipe, which is inserted through a manhole to a position corresponding to the collapsed section within the existing drain pipe and pushes the collapsed section back to its original position before collapse, A base plate having a seating surface that sits on the opposite surface of the recessed portion of the existing drain pipe, A recessed portion push-up plate having a cylindrical convex surface with a required radius of curvature, Multiple connecting guides are provided to connect the opposing surfaces of the base plate and the recessed portion push-up plate so that they can move closer together and further apart when inserted into the existing drain pipe, so that the recessed portion push-up plate does not interfere with the recessed portion. A push-up driving means provided on the base plate pushes up the recessed portion with the recessed portion push-up plate to restore it to a position that matches the inner surface of the existing drain pipe. A device for restoring a collapsed section of an existing drainpipe, characterized by comprising the following features.

2. The aforementioned push-up driving means is Multiple hydraulic cylinders are provided to connect the base plate and the recessed portion push-up plate, A hydraulic control unit installed on the ground, A pressurized oil supply hose extending from the hydraulic control unit and connected to the hydraulic cylinder through the manhole and the existing drain pipe, A device for restoring a collapsed section of an existing drain pipe, as described in claim 1, characterized by having the following:

3. The aforementioned push-up driving means is Two angle-threaded hanging bolts, each with its upper end fixed at two positions requiredly spaced apart in the direction of the pipe of the recessed portion push-up plate, and each lower end hanging down to a position close to the base plate, Two sprocket-equipped nut blocks, each having a central hole that screws into the aforementioned square-threaded hanging bolt, and the female square-threaded portion that screws onto the upper part of the square-threaded hanging bolt, with the outer circumference being a sprocket portion, Two nut block support stands, the lower end of which is fixed to the base plate and the upper end of which rotatably supports each of the sprocket-equipped nut blocks, The system includes a chain winding mechanism that engages with the sprocket portion and rotates the two sprocket-equipped nut blocks, and further, A reduction gear is installed on the base plate and has an output shaft connected to the sprocket rotation shaft on the manhole side of the chain winding mechanism, A servo motor is installed on the base plate and its output shaft is connected to the input shaft of the reduction gear, A control unit for servo motors installed on the ground and The existing drain pipe collapse restoration device according to claim 1, further comprising:

4. The aforementioned push-up driving means is Two angle-threaded lifting bolts, the upper ends of which are fixed at two positions in the pipe direction of the recessed portion push-up plate and the lower ends of which hang down to a position close to the base plate, Two geared nut blocks, each having a female square threaded portion in the center that screws into the aforementioned square threaded lifting bolts, and a helical follower gear portion on its outer circumference, Two support stands, the lower end of which is fixed to the base plate, rotatably support each geared nut block so that each geared nut block is screwed onto the upper part of the angle-threaded lifting bolt at a fixed height, The system comprises a horizontal shaft having a helical primary gear section that meshes with each of the aforementioned helical follower gear sections in a manner that is not separated, and further, A reduction gear is installed on the base plate and has an output shaft connected to the manhole-side end of the horizontal shaft, A servo motor is installed on the base plate and its output shaft is connected to the input shaft of the reduction gear, A control unit for servo motors installed on the ground and A device for restoring a collapsed section of an existing drain pipe, as described in claim 1, characterized by including the following:

5. The aforementioned push-up driving means is Two pairs of bendable links connect the base plate and the recessed portion push-up plate at two positions in the direction of the pipe, A right-hand square screw nut block connected by a pin shaft to the bent portion of one of the bent links, and a left-hand square screw nut block connected by a pin shaft to the bent portion of the other bent link, The horizontal screw shaft consists of a male right-hand threaded portion that screws into the right-hand square screw nut block and a male left-hand threaded portion that screws into the left-hand square screw nut block. A reduction gear is installed on the base plate and has an output shaft connected to the manhole-side shaft end of the horizontal screw shaft, A servo motor is installed on the base plate and its output shaft is connected to the input shaft of the reduction gear, A control unit for servo motors installed on the ground and A device for restoring a collapsed section of an existing drain pipe, as described in claim 1, characterized by including the following:

6. Furthermore, it includes two protective cylinders that are semi-cylindrical in shape, with an inner radius of curvature equal to the outer radius of curvature of the existing drain pipe, and are bolted together to conceal the recessed portion of the existing drain pipe from the outside. A device for restoring a collapsed section of an existing drainpipe, as described in any one of claims 1 to 5.

7. The vertical shaft is excavated to expose the collapsed section of the existing drainpipe, and the collapsed section is concealed with two semi-cylindrical protective tubes whose inner radius of curvature is equal to the outer radius of curvature of the existing drainpipe. The existing drain pipe collapse restoration device described in any one of claims 1 to 5 is inserted into the existing drain pipe through a manhole and positioned at the location corresponding to the collapse, the push-up driving means provided in the collapse restoration device is activated to press the collapse push-up plate against the collapse, and the collapse push-up plate is raised until it contacts the inner surface of the existing drain pipe, thereby pushing the collapse back to its original position before collapse. A method for restoring a collapsed section of an existing drainage pipe, characterized by the features described above.

8. After pushing the collapsed portion of an existing drain pipe back to its original position before collapse using the restoration method for the collapsed portion of an existing drain pipe described in claim 7, the two-part protective cylinder is removed, a formwork is attached with the support of appropriate support means to conceal the collapsed portion and create a thin-walled space on the inner and outer surfaces of the pipe, a water leakage prevention hardening agent is filled through injection holes in the formwork, the formwork is removed after the hardening agent has hardened, and the vertical shaft is backfilled. A method for restoring a collapsed section of an existing drainage pipe, characterized by the features described above.

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