JP5503273B2 - Method for expanding the rehabilitation pipe using the tube expansion device - Google Patents

Description

The present invention relates to a tube expansion method for a rehabilitated tube using a tube expansion device.

  Conventionally, in order to rehabilitate existing pipes such as sewer pipes, agricultural water pipes, gas pipes, and power communication cable pipes that have deteriorated over time, the existing pipes embedded in the ground over adjacent manholes Insert a liner material made of a thermoplastic resin such as vinyl chloride that has a smaller diameter than the inner diameter and recovers into a circular tube shape at the shape memory temperature, expand the diameter of the liner material by heating, and restore it to a circular tube shape. After that, a rehabilitation method for forming a rehabilitation pipe by bringing a circular pipe liner material into close contact with the inner peripheral surface of an existing pipe has been proposed and implemented (for example, see Patent Document 1).

  Here, when the cable conduit is rehabilitated by a rehabilitation pipe, when various cables such as communication cables such as power cables and optical fiber cables are inserted into the rehabilitation pipe and laid, the edge of the rehabilitation pipe and the various cables come into contact with each other. Otherwise, various cables may be damaged. For this reason, in the rehabilitation pipe for rehabilitating the cable pipe, the pipe port is protruded into the manhole for a certain length, and the protruded pipe opening is expanded so that the outer diameter is increased. Thereby, contact with various cable and the opening edge part of a renovated pipe can be prevented, and it can insert smoothly in a renovated pipe, without damaging various cables.

  Specifically, a hot air blowing duct is introduced into the manhole, hot air is supplied to the rehabilitation pipe port and softened, and the expansion mold is pressed against the softened rehabilitation pipe port to open the rehabilitation pipe port. The tube is expanded to a shape corresponding to the expanded portion of the expansion mold.

Japanese Patent Laid-Open No. 11-230212

  By the way, the pressing of the expansion die to the port of the rehabilitation pipe is carried out by fixing the jack in the manhole and then advancing the expansion die with respect to the jack via an expansion / contraction mechanism. However, depending on the structure and shape of the manhole or the relationship with various cables inserted into other cable conduits, there are cases where a jack or an expansion / contraction mechanism cannot be arranged in the manhole. In addition, there is a drawback in that it is difficult to control the temperature of the rehabilitating pipe port by supplying hot air from the hot air blowing duct to the rehabilitating pipe port for heating.

The present invention has such has been made in view of the problems, regardless of such structures manhole, the rehabilitating pipe using able Ru ductal orifice tube expanding device be easily reliably tube expanding the tube opening of the rehabilitating pipe A tube opening method is provided.

Ductal orifice tube expansion method rehabilitating pipe using the pipe opening expanding apparatus of the present invention, using a ductal orifice tube expanding device protrudes caused tube opening into the thermoplastic resin of the rehabilitating pipe set length manhole rehabilitating the existing pipe A reaming tube expansion method for expanding a rehabilitation tube , wherein the tube expansion device is provided in the center screw at intervals in the circumferential direction, and is movable between a large diameter position and a small diameter position. A fixed unit equipped with a grip bar and a center screw of the fixed unit are detachably attached, and the outer surface of the rehabilitation pipe has a morning glory-shaped enlarged portion that can be heated via a heater. Consists of a tube main body and a tube expansion jig having a tube expansion mold made of a resin-made cylindrical guide member that has an outer diameter corresponding to the inner diameter of the rehabilitation pipe and is integrally connected to the front end surface of the mold main body Set the length of the rehabilitation pipe in the manhole Out was taken, is inserted a fixing unit in the interior of the rehabilitating pipe, rotates the center screw, after fixing the rehabilitation pipe fixing unit and moving each gripper bar to the large diameter position, the tube expanding gold center screw It is characterized in that a die is mounted and the mold body of the tube expansion mold heated to a set temperature via a heater is pressed against the tube port of the rehabilitation tube to expand the tube port into a shape corresponding to the expanded portion. is there.

According to the present invention, the fixed unit is inserted into the rehabilitation pipe, the center screw is rotated to move each grip bar to the large diameter position, and the fixed unit is moved via the plurality of grip bars moved to the large diameter position. Secure to the rehabilitation tube. Next, the expansion die is attached to the center screw, and the expansion die main body is heated to a set temperature via a heater, and then the heated injection mold main body is pressed against the regenerative tube opening so that the opening is closed. The tube is expanded to a shape corresponding to the expanded portion.

As a result, by inserting the fixing unit inside the rehabilitating pipe, after fixing the rehabilitation pipe fixing unit through the grip bar by rotating the center screw, the tube expansion die is attached to the center screw, tube expansion mold gold A simple operation of heating the mold body to a set temperature and pressing it against the tube opening of the rehabilitation tube can reliably expand the tube opening of the rehabilitation tube regardless of the structure of the manhole.

  According to the present invention, the port of the rehabilitation pipe can be easily and reliably expanded regardless of the structure of the manhole.

It is a half cross-sectional view showing a tube-opening device used in the method of expanding a rehabilitation tube of the present invention. It is an AA arrow line view of FIG. It is process drawing explaining the pipe-opening method of the rehabilitation pipe | tube using the pipe-opening apparatus of this invention . FIG. 4 is a process diagram for explaining a tube expansion method for a rehabilitated tube following FIG. 3 . FIG. 5 is a process diagram for explaining a tube expansion method for a rehabilitated tube following FIG. 4 . FIG. 6 is a process diagram for explaining a tube expansion method for a rehabilitated tube following FIG. 5 . FIG. 7 is a process diagram illustrating a method for expanding a rehabilitating tube after the step shown in FIG. 6. FIG. 8 is a process diagram for explaining a tube expansion method for a rehabilitation pipe following FIG. 7 . FIG. 9 is a process diagram for explaining a tube expansion method for a rehabilitated tube following FIG. 8 . FIG. 10 is a process diagram for explaining a tube expansion method for a rehabilitated tube following FIG. 9 .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show an embodiment of a tube opening device 1 used in the method of expanding a rehabilitating tube according to the present invention.

  The tube opening expanding device 1 of this embodiment is inserted into the rehabilitation pipe R and fixed to the rehabilitation pipe R, and is detachably attached to the fixing unit 2. It is comprised from the pipe expansion jig 3 which presses and expands the pipe opening r.

  The fixed unit 2 is provided with a center screw 21 formed on the male screw 21a except for the front end portion, and three connecting portions 221 at an interval of 120 degrees in the circumferential direction. A bearing 22a is provided at the front end portion of the center screw 21. The bearing member 22 is rotatably supported via a screw, and a total of three sets of connecting portions 231 are provided one after the other with a spacing of 120 degrees in the circumferential direction, and the female screw corresponding to the male screw 21a of the center screw 21 is provided. And three front grip arms 24 whose base end portions are rotatably connected to the connecting portions 221 of the bearing member 22 via pins, respectively. Each of the front and rear sets of the moving nut 23 is connected to a pair of front and rear connecting portions 231 via a pin, and each of the front and rear sets 25 has a total of six rear grip arms 25; The connecting portions 261 are respectively provided later, and the front end portions of the corresponding front grip arms 24 and the front end portions of the front rear grip arms 25 are rotatably connected to the front connecting portions 261 via pins, respectively. The front end portion of each rear rear grip arm 25 is composed of three grip bars 26 that are rotatably connected to the rear connecting portion 261 via pins.

  Here, each front grip arm 24 and each rear grip arm 25 are formed to have the same length, and each grip bar 26 has a receiving surface parallel to the axis of the center screw 21. In addition, each front grip arm 24 and each rear rear grip arm 25 corresponding to each other are connected to each connecting portion 221 of the bearing member 22 so as to form an equiangular trapezoidal leg having an angle with the center screw 21 of less than 90 degrees. And a connecting portion 261 at the front of each grip bar 26, a connecting portion 231 at each rear of the moving nut 23, and a connecting portion 261 at the rear of each grip bar 26. Further, the front and rear sets of connecting portions 231 and 231 of the moving nut 23 and the front and rear connecting portions 261 and 261 of the grip bars 26 are arranged so that the front and rear sets of rear grip arms 25 form a parallel link mechanism. It is connected.

  Specifically, the pin connection point of each front grip arm 24 with respect to each connection portion 221 of the bearing member 22 and the front connection portion 261 of each grip bar 26, and each rear connection portion 231 and each grip bar of the moving nut 23. The pin connection point of each rear rear grip arm 25 with respect to the rear connection portion 261 is set so as to form an isometric trapezoid. Further, the pin connection points of the front and rear rear grip arms 25 and 25 with respect to the front and rear pair of connection portions 231 and 231 of the moving nut 23 and the front and rear connection portions 261 and 261 of the grip bars 26 form a parallelogram. Is set to

  As a result, each grip bar 26 has a receiving surface parallel to the axis of the center screw 21 by rotating the corresponding front grip arm 24 and the corresponding pair of front and rear rear grip arms 25. It is possible to move between a small position and a large diameter position. That is, by rotating the center screw 21, the moving nut 23 can be advanced and retracted, and each front grip arm 24 and each pair of front and rear rear grip arms 25, 25 are respectively connected to the bearing member 22 and the moving nut 23. The corresponding grip bar 26 can be moved up and down and moved between the large diameter position and the small diameter position.

  The tube expansion jig 3 includes a tube expansion die 31 that is detachable from the center screw 21 of the fixed unit 2 and an operation member 32 that is screwed to the center screw 21 and pushes the tube expansion die 31 along the center screw 21. It is configured.

  The expansion die 31 has an enlarged diameter portion 33a, for example, a die body 33 having a morning glory-shaped outer peripheral surface and a substantially truncated cone-shaped hollow portion 33b, and an outer diameter corresponding to the inner diameter of the renovated tube R. A cylindrical guide member 34 made of heat-resistant resin integrally connected to the front end surface of the mold main body 33 via a bolt and a substantially truncated cone shape corresponding to the hollow portion 33b of the mold main body 33. A heater base 36 made of a heat-resistant resin is provided with a heater 35 on the outer peripheral surface, specifically, a sheet heating element having a parallel tapered surface with the outer peripheral surface and the inner peripheral surface tapered forward. And a center boss 37 that integrally couples the heater base 36 to the mold body 33 via bolts. The center boss 37, the mold body 33, and the guide member 34 pass through the center and are fixed units. 2 Centers Besides insertion hole 31a of a diameter slightly larger than the outer diameter of the Liu 21 is formed, the heater base 36 is a connector for energizing the planar heating element (not shown) is provided.

  Here, as the planar heating element, a silicon rubber heater according to the manufacture and sale of Yako Electric Manufacturing Co., Ltd., which is formed by sandwiching the heating element from both sides with a silicon resin sheet, is employed.

  On the other hand, the operation member 32 includes a handle boss 38 having a female screw corresponding to the male screw 21 a of the center screw 21 in the fixed unit 2 and capable of being screw-coupled to the center screw 21, and a plurality of arms 391 on the handle boss 38. The handle boss 38 can be moved forward and backward along the center screw 21 by rotating the operation handle 39.

  In addition, the rehabilitation pipe | tube R makes the liner material formed with thermoplastic resins, such as a vinyl chloride, contact | adhere to the internal peripheral surface of the existing pipe L as mentioned above.

  Next, a construction procedure for expanding the pipe port r of the rehabilitated pipe R using the pipe expanding apparatus 1 configured as described above will be described below.

  In this case, it is assumed that the existing pipe L to be rehabilitated is rehabilitated by the rehabilitation pipe R, and the pipe port r protrudes into the manhole M for a set length and is cut.

  First, after the fixed unit 2 is inserted into the rehabilitation pipe R so that the base end portion of the center screw 21 protrudes into the manhole M having a predetermined length, the tube expansion die 31 is inserted into the center screw 21 through the insertion hole 31a. It mounts | wears with and the front-end | tip of the guide member 34 is inserted in the pipe opening r of the renovated pipe R (refer FIG. 3). Next, the center screw 21 is rotated forward using a crank arm or the like attached to the base end portion thereof, and the moving nut 23 screwed to the center screw 21 is advanced. When the moving nut 23 moves forward and narrows the distance from the bearing member 22, it is supported by the front grip arms 24 connected to the bearing member 22, so that each pair of front and rear rear grip arms 25, 25 is moved to the moving nut 23. The front grip arms 24 connected to the corresponding bearing members 22 also stand up with respect to the bearing members 22 by the same angle as that of the rear grip arms 25. As a result, each grip bar 26 connected to each corresponding front grip arm 24 and each pair of front and rear rear grip arms 25 is gradually moved to a large diameter position. If each grip bar 26 is moved to the large diameter position and its receiving surface is abutted against the inner peripheral surface of the rehabilitation pipe R, the fixed unit 2 is not moved to the rehabilitation pipe R via the three grip bars 26. (See FIG. 4).

  If the fixing unit 2 is fixed to the rehabilitation pipe R, the handle boss 38 of the operation member 32 is screwed to the center screw 21 (see FIG. 5), and then the heater 35 (planar heating element) is energized to 33 is heated.

  Here, the set temperature of the mold body 33 is set to 100 ° C., for example, corresponding to the liner material. In this case, the temperature of the mold body 33 can be easily adjusted by the amount of current to the heater 35 (planar heating element), and the temperature is not shown in detail, but a non-contact temperature sensor is used. Can be easily grasped.

  When it is confirmed that the mold main body 33 is heated and raised to the set temperature of 100 ° C., the operation handle 39 is rotated forward and the operation member 32 is advanced along the center screw 21. As a result, the tube expansion die 31 attached to the center screw 21 can be pushed forward by abutting the handle boss 38 of the operation member 32 against the tube expansion die 31. When the tube expansion die 31 is pushed forward, the mold body 33 heated to the set temperature is pressed against the tube port r of the rehabilitated tube R to soften the tube port r, and the expanded portion of the mold body 33 The shape corresponding to 33a, specifically, a morning glory shape can be expanded (see FIG. 6).

  If the pipe port r of the rehabilitation pipe R is expanded to a shape corresponding to the enlarged diameter portion 33a of the mold body 33, the energization to the heater 35 is cut off and the mold body 33 is cooled. When the mold body 33 cools and falls to a set temperature, for example, 40 ° C. or lower, the operation handle 39 is rotated in the reverse direction to retract the handle boss 38 along the center screw 21 and detach the operation member 32. (See FIG. 7). Further, the tube expansion die 31 is gripped and pulled backward, and is similarly detached from the center screw 21 (see FIG. 8).

  After that, if the center screw 21 is rotated in the opposite direction (see FIG. 9), the moving nut 23 is retracted, and the corresponding front grip arm 24 and the pair of front and rear rear grip arms 25 are laid down. Thus, the grip bar 26 can be moved from a large diameter position where the receiving surface is abutted against the inner peripheral surface of the rehabilitation pipe R to a small diameter position separated from the inner peripheral surface (see FIG. 10). Thereby, fixation of the fixing unit 2 with respect to the rehabilitation pipe | tube R by the three grip bars 26 can be cancelled | released. Thereafter, the fixing unit 2 can be pulled out from the rehabilitation pipe R whose tube opening r is expanded in a morning glory shape.

  In this way, after the fixed unit 2 is inserted into the rehabilitating pipe R, the three grip bars 26 are respectively moved to the large diameter positions, and abut the inner surface of the rehabilitating pipe R to fix the fixing unit 2. In addition to attaching the tube expansion die 31 to the fixed unit 2 and heating the tube expansion die 31 and pressing it against the tube port r of the rehabilitation tube R, the tube port r of the rehabilitation tube R is connected to the tube expansion die 31. The tube can be reliably expanded into a shape corresponding to the enlarged-diameter portion 33a of the mold body 33.

  As a result, the fixed unit 2 can be fixed inside the rehabilitating pipe R without being affected by the structure of the manhole M, etc., and the expansion mold 31 can be attached using the fixing unit 2 fixed to the rehabilitating pipe R. Since it can be pressed against the tube port r of the rehabilitation tube R, the tube port r of the rehabilitation tube R can be expanded easily and reliably regardless of the structure of the manhole M or the like.

  In the above-described embodiment, the case where the three front grip arms 24, the rear grip arms 25, and the grip bars 26 are provided at intervals of 120 degrees in the circumferential direction of the center screw 21 has been described. The number is not limited as long as it is above.

  Moreover, although the case where it formed in the morning glory shape was illustrated as the enlarged diameter part 33a of the metal mold | die body 33 in the pipe expansion metal mold 31, if the contact with various cables and the port r edge part of the renovated pipe R can be prevented. For example, it is possible to employ an arbitrary diameter-expanded portion 33a that can be expanded so as to expand in the protruding direction.

DESCRIPTION OF SYMBOLS 1 Pipe port expansion apparatus 2 Fixed unit 21 Center screw 22 Bearing member 23 Moving nut 24 Grip bar 25 Front grip arm 26 Rear grip arm 3 Tube expansion jig 31 Tube expansion die 32 Operation member 33 Mold main body 33a Diameter expansion part 34 Guide member 35 Heater (planar heating element)
36 Heater base 37 Center boss M Manhole L Existing pipe R Rehabilitation pipe r Pipe port

Claims (1)

A tube inlet tube expansion method of the rehabilitating pipe that tube expansion using a ductal orifice tube expanding device protrudes caused tube opening to set the length in the manhole of a thermoplastic resin rehabilitating pipe for rehabilitating an existing pipe, the pipe outlet tube expander Is fixed to the center screw with a plurality of grip bars that are movable in the circumferential direction and move between the large diameter position and the small diameter position. A mold body having an outer diameter corresponding to the inner diameter of the mold body and the rehabilitation pipe which can be heated via a heater. A tube expansion jig comprising a tube expansion mold made of a resin cylindrical guide member integrally connected to the front end surface of the main body, and cut the rehabilitation tube by protruding a set length into the manhole. Is inserted into the rehabilitation tube. At the same time, rotate the center screw, move each grip bar to the large diameter position and fix the fixed unit to the rehabilitation pipe, then attach the tube expansion mold to the center screw and heat it to the set temperature via the heater A method of expanding a rehabilitating tube using a tube expanding device, wherein the die body of the mold is pressed against the tube opening of the rehabilitating tube to expand the tube opening to a shape corresponding to the expanded portion.

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