JP2007277974A - Apparatus for replacing underground tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for replacing underground tubes and capable of easily destroying existing tubes even in the case that the existing tubes are concrete tubes using steel collars and easily elongating vinyl chloride tubes. <P>SOLUTION: The apparatus (50) for replacing underground tubes is provided with a top (52); a body (53); and a newly-provided-tube connecting part (54). The top is provided with a plurality of rear petals (58) connected to the tip circumferential edge (56) of the body in such a way as to be rocked in radial directions; a plurality of front petals (60) supported at tips of the rear petals in such a way as to be rocked in radial directions; a tip cone (62) pivoting the tips of the front petals; at least one front blade (64) or more provided in the vicinity of rear ends of the front petals; a rear blade (66) positioned immediately in the rear of the front blade and provided in the vicinity of front ends of the rear petals; and an actuator (70) for rocking the front petals and the rear petals. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an underground pipe replacement device used when replacing existing pipes such as sewer pipes buried underground without excavating the ground while replacing them with new pipes.

  As a conventional underground pipe replacement device, the one disclosed in Patent Document 1 below is known. This underground pipe replacement device is shown in FIG.

  As shown in FIG. 7, the underground pipe replacement device includes a steel head portion 22, a trunk portion 23, and a new pipe connecting portion 24. The head 22 is somewhat thinner than the existing pipe 45 to be destroyed, and a shackle housing 40 having eyes 41 for connecting a traction cable (not shown) is provided at the front end thereof. The body part 23 is somewhat thicker than the existing pipe 45 to be destroyed, and a taper continuous to the head part 22 is provided at the tip thereof. A new pipe 43 to be newly installed is connected to the new pipe fastening portion 24.

  A groove 25 is provided in the head 22, a cutting blade 26 is disposed in the groove 25, and a ram 39 of a fluid pressure actuator is disposed along the central axis of the head 22. The front end of the cutting blade 26 is pivotally supported on the head 22 by a pin 27, the outer side thereof is a blade 29, and a ram 39 of a fluid pressure actuator is in contact with the inner surface of the cutting blade 26. The cutting blade 26 can be made to appear and disappear from the head 22 by moving back and forth.

  When the existing pipe 45 is replaced with the new pipe 43 by the underground pipe replacement device, the new pipe 43 is connected to the new pipe connection portion 24 of the underground pipe replacement device, and the blade 29 of the cutting blade 26 is moved from the head 22. It is made to project, and a traction cable is connected to the shackle housing 40 and is pulled by a traction means installed in the front longitudinal section. As a result, the underground pipe replacement device advances while cutting and destroying the existing pipe 45 by the blade 29 of the cutting blade 26, and replaces the existing pipe 45 with the new pipe 43.

  According to this underground pipe replacement device, it is possible to replace the existing pipe 45 with the new pipe 43 while destroying the existing pipe 45 such as a sewer pipe buried underground without excavating the ground. Cost reduction and construction period reduction.

Japanese Patent Publication No. 60-27873

  The underground pipe replacement device disclosed in Patent Document 1 advances the existing pipe 45 made of concrete by moving the blade 29 of the cutting blade 26 in a state in which the blade 29 protrudes somewhat from the groove 25 provided in the head 22. In the case where the existing pipe 45 is a concrete pipe with a hard steel collar used as a joint or a polyvinyl chloride pipe that is easily stretched, the existing pipe 45 cannot be easily broken by the blade 29 of the cutting blade 26. There was a problem that things happened easily.

  The present invention has been made in view of the above problems, and the underground pipe that can easily break the existing pipe even when the existing pipe is a concrete pipe using a hard steel collar or an easily stretched vinyl chloride pipe. It is an object to provide a replacement device.

  In order to solve the above-mentioned problem, the invention according to claim 1 is an underground pipe replacement apparatus including a head, a trunk, and a newly installed pipe connecting portion, wherein the head has a diameter at a peripheral edge at a tip of the trunk. A plurality of rear petals coupled so as to be swingable in a direction, a plurality of front petals coupled so as to be swingable in a radial direction at the tip of the rear petal, and a tip cone coupled to the tip of the front petal; A blade provided at a rear end portion of one or more front petals or a front end portion of one or more rear petals, and an actuator for swinging the front petals and rear petals.

  According to a second aspect of the present invention, in the underground pipe replacement device comprising a head, a trunk, and a newly installed pipe connecting portion, the head is connected to a peripheral edge of the tip of the trunk so as to be swingable in a radial direction. A plurality of rear petals, a plurality of front petals connected to a front end of the rear petals so as to be swingable in a radial direction, a front end cone connected to a front end of the front petals, and a rear end portion of the front petals And a front blade provided at a front end portion of the rear petal immediately after the front blade, and an actuator for swinging the front petal and the rear petal.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the actuator is installed on a central axis at the rear of the head, and the tip of the ram of the actuator and the front petal or the rear petal are linked by a link. It is connected.

  According to a fourth aspect of the present invention, in the first, second, or third aspect of the present invention, a lateral projecting portion is provided on each side of the front petal and the rear petal, and the lateral projecting portion is an adjacent front petal. And it overlaps with the side overhang | projection part of a back petal so that sliding is possible, It is characterized by the above-mentioned.

  According to the first aspect of the present invention, in the underground pipe replacement device, the head includes a plurality of rear petals connected to a peripheral edge portion of the front end of the trunk portion so as to be swingable in the radial direction, and a front end of the rear petal. A plurality of front petals connected to the front end of the front petal, a rear end of one or more front petals, or one or more rear petals. Since the blade provided at the front end and the actuator for swinging the front and rear petals are provided, the underground pipe replacement device is moved into the existing pipe, the actuator is operated, and the front and rear petals are swung. The existing pipe can be destroyed by moving and increasing the diameter of the part where the blade is provided. Then, the existing pipe can be easily replaced with the new pipe by repeating the advancement of the underground pipe replacement device and the destruction of the existing pipe due to the increase in the diameter of the portion provided with the blade. Moreover, since the portion where the blade is provided is the position where the diameter can be increased or decreased, the existing tube can be easily broken even if the existing tube is a polyvinyl chloride tube which is easy to extend. Even if a hard steel collar is used for the joint of the existing pipe, it is not necessary to pull or push the underground pipe replacement device with a strong force. It can be easily destroyed. For this reason, in order to propel the underground pipe replacement device, since a large force is not required, the underground pipe replacement is easier than the conventional one.

  According to the invention which concerns on Claim 2, as a blade which destroys an existing pipe | tube, the front blade provided in the rear-end part of the front petal, and the back provided in the front-end part of the back petal immediately after this front blade Since the blade is provided, the total length of the front blade and the rear blade is increased, the length that can be broken at a time is increased, and the underground pipe can be replaced more efficiently.

  According to the invention of claim 3, the actuator is further installed on the central axis behind the head, and the tip of the ram of the actuator and the front petal or the rear petal are connected by a link. A large number of front petals and rear petals can be swung to save cost and space.

  According to the invention which concerns on Claim 4, the side overhang | projection part is further provided in the both sides of the said front petal and the said back petal, respectively, and this side overhang | projection part is a side overhang part of the adjacent front petal and back petal. Therefore, earth and sand and fragments of existing pipes do not enter the underground pipe replacement device, and the occurrence of failure is reduced.

  Hereinafter, an embodiment of the underground pipe replacement device of the present invention will be described based on the drawings. FIG. 1 is a longitudinal sectional view when the diameter of the head 52 of the underground pipe replacement device 50 is reduced. FIG. 2 is a longitudinal sectional view when the diameter of the head 52 of the underground pipe replacement device 50 is enlarged. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.

  The underground pipe replacement device 50 also includes a steel head 52, a trunk portion 53, and an existing pipe connecting portion 54. The trunk portion 53 and the existing pipe connecting portion 54 have substantially the same configuration as that of the conventional one. However, the head 52 is improved as described below.

  The head 52 includes three pairs of rear petals 58 that are connected to the distal end peripheral portion 56 of the body 53 so as to be swingable in the radial direction, and 3 are connected to the tip of the rear petal 58 so as to be swingable in the radial direction. It consists of a pair of front petals 60 and a tip cone 62 connected to the tip of the front petal 60. A front blade 64 and a rear blade 66 are fixed to the rear end portions of the pair of front petals 60 located on the vertical plane of the underground pipe replacement device 50 and the front end portions of the pair of rear petals 58 by welding or the like. A tapered portion is provided on the front end side of the front blade 64 and the rear blade 66 so as to easily advance in the existing pipe 45.

  An actuator 70 that is operated by fluid pressure (hydraulic pressure or air pressure) is installed on the central axis 68 of the head 52 near the rear end. The tip 74 of the ram 72 of the actuator 70 and the tip of the rear petal 58 are connected by a link 76. It is connected. Of course, the front end portion 74 of the ram 72 and the rear end of the front petal 60 may be changed to be connected by the link 76. Here, if the actuator 70 is operated to advance the ram 72, the diameter of the portion of the head 52 where the front blade 64 and the rear blade 66 are located can be greatly increased, and if the ram 72 is moved backward, the head The front petal 60 and the rear petal 58 can be made straight by reducing the diameter of the portion where the front blade 64 and the rear blade 66 are located in 52. The diameter of the portion where the front blade 64 and the rear blade 66 are located is preferably such that the front blade 64 contacts the existing tube 45 when the head 52 is reduced in diameter and inserted into the existing tube 45. The reason why the front blade 64 is attached to the rear end of the front petal 60 and the rear blade 66 is attached to the front end of the rear petal 58 is to increase the overall length of both the blades 64 and 66 as much as possible in a position where the diameter can be increased or decreased. is there.

  Side projecting portions 80 a and 80 b are provided on both sides of each front petal 60 and each rear petal 58. The side overhang 80a on one side of each petal 58, 60 is slidably overlapped with the side overhang 80b on the other side of the adjacent petal 58, 60, and the side overhang on the other side of each petal 58, 60. 80b is slidably overlapped with a laterally extending portion 80a on one side of the adjacent petals 58, 60. By providing these laterally extending portions 80a and 80b, there is no gap between the adjacent petals 58 and 60 even if the diameter of the portion where the front blade 64 and the rear blade 66 are located is greatly increased. The earth and sand and fragments of the existing pipe 45 do not enter the underground pipe replacement device 50.

  The tip cone 62 is provided with a swivel joint (not shown) for connecting a traction cable (not shown).

  When the existing pipe 45 is replaced with the new pipe 43 by the underground pipe replacement device 50, the new pipe 43 is connected to the new pipe connecting portion 54 of the underground pipe replacement apparatus 50 as shown in FIG. While the diameter of the portion 52 is reduced, the tip cone 62 is pulled with a traction cable (not shown), and the rear portion of the new pipe 43 is pushed with a jack (not shown) so that the front blade 64 comes into contact with the existing pipe 45 before destruction or a shallow scratch. The underground pipe replacement device 50 is advanced to the extent that it is applied. Next, as shown in FIG. 2, the actuator 70 is operated to advance the ram 72 to greatly increase the diameter of the portion of the head 52 where the front blade 64 and the rear blade 66 are located. Then, the existing pipe 45 is cut and broken by the front blade 64 and the rear blade 66. Next, the actuator 70 is operated to move the ram 72 backward, and as shown in FIG. 1 again, the diameters of the portions of the head 52 where the front blade 64 and the rear blade 66 are located are reduced, and the underground pipe The replacement device 50 is advanced.

  Hereinafter, the existing pipe 45 is replaced with the new pipe 43 by repeating the advancement of the underground pipe replacement device 50 in a state where the diameter of the head 52 is reduced and the destruction of the existing pipe 45 due to the diameter expansion of the head 52. I can go.

  According to the present embodiment, the underground pipe replacement device 50 is moved into the existing pipe 45, the actuator 70 is operated, the front petal 60 and the rear petal 58 are swung, and the front blade 64 and the rear blade 66 are provided. The existing pipe 45 can be easily broken by increasing the diameter of the formed portion. Then, the existing pipe 45 is newly installed without excavating the ground by repeating the forward movement of the underground pipe replacement device 50 and the destruction of the existing pipe 45 by increasing the diameter of the portion where the front blade 64 and the rear blade 66 are provided. The tube 43 can be replaced. Moreover, since the front blade 64 and the rear blade 66 are disposed at the rear end of the front petal 60 and the front end of the rear petal 58 and the total length of the two blades 64 and 66 is increased, the existing pipe 45 can be broken as long as possible at one time. Efficient underground pipe replacement is possible.

  In addition, since the front blade 64 and the rear blade 66 are arranged at a position where the diameter of the rear end of the front petal 60 and the front end of the rear petal 58 can be increased or decreased, the existing tube 45 can be easily broken even if it is easily stretched. it can. Even if the existing pipe 45 is a concrete pipe using a hard steel collar for the joint, the front blade 64 and the rear blade 66 are provided without the need to pull or push the underground pipe replacement device 50 with a strong force. Since the existing pipe 45 can be easily broken simply by increasing the diameter of the portion, the propulsive force for moving the underground pipe replacement device 50 forward can be small. Therefore, by pushing the rear part of the new pipe 43 connected to the rear part of the underground pipe replacement device 50 with a small output jack and pulling the pulling cable connected to the tip cone 62 with the small output winch, the underground pipe is obtained. Since the replacement device 50 can be moved forward, the underground pipe can be replaced easily.

  Furthermore, since the actuator 70 is installed on the central axis 68 behind the head 52 and the distal end portion of the ram 72 of the actuator 70 and the front petal 60 or the rear petal 58 are connected by the link 76, a large number of actuators 70 are used by one actuator 70. The front petal 60 and the rear petal 58 can be swung, and cost and space can be saved.

  Further, since the laterally extending portions 80a and 80b of the petals 58 and 60 are slidably overlapped with the laterally extending portions 80a and 80b of the adjacent petals 58 and 60, the underground pipe replacement device is provided. The earth and sand and the fragments of the existing pipe 45 do not enter inside 50, and the occurrence of failure is reduced.

  By the way, the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above-described embodiment, the three pairs of the front petal 60 and the rear petal 58 are provided, but the front petal 60 and the rear petal 58 may each be a pair or more, and may be an odd number or an odd number. .

  In the above embodiment, the front blade 64 and the rear blade 66 are provided only on the pair of front petals 60 on the diagonal in the cross section, and the pair of rear petals 58, but at least one or more appropriate front petals 60 or appropriate Only the blades 64 and 66 may be provided on any of the rear petals 58. Of course, all the front petals 60 and the rear petals 58 may be provided with the front blades 64 and the rear blades 66.

  Further, in the above-described embodiment, the distal end portion 74 of the ram 72 of the actuator 70 and the rear petal 58 are connected by the link 76. However, a plurality of actuators 70 are provided, and the distal end of the ram 72 of each actuator 70 is directly It may be connected to the front pedal 60. Of course, the installation position of the actuator 70 may be changed as appropriate.

It is a longitudinal cross-sectional view of the state which reduced the diameter of the head of the underground pipe replacement apparatus which concerns on one Example of this invention. It is a longitudinal cross-sectional view of the state which expanded the head of the said underground pipe replacement apparatus. It is a cross-sectional view which follows the III-III line in FIG. It is a cross-sectional view which follows the IV-IV line in FIG. It is a cross-sectional view which follows the VV line in FIG. It is a cross-sectional view which follows the VI-VI line in FIG. It is a longitudinal cross-sectional view of the conventional underground pipe replacement device.

Explanation of symbols

50 Underground pipe replacement device 52 Head 54 Body 56 New pipe connecting part 58 Rear petal 60 Front petal 62 Front cone 64 Front blade 66 Rear blade 70 Actuator 72 Ram 74 Link 80a, 80b Side projection

Claims (4)

In the underground pipe replacement device comprising a head, a trunk, and a newly installed pipe connecting part,
The head includes a plurality of rear petals connected to a peripheral edge portion of the front end of the body portion so as to be swingable in a radial direction, and a plurality of front petals connected to a tip end of the rear petal so as to be swingable in a radial direction. A front end cone connected to a front end of the front petal, a blade provided at a rear end portion of one or more front petals or a front end portion of one or more rear petals, the front petal and the rear petal An underground pipe replacement device comprising an actuator for swinging the pipe. In the underground pipe replacement device comprising a head, a trunk, and a newly installed pipe connecting part,
The head includes a plurality of rear petals connected to a peripheral edge portion of the front end of the body portion so as to be swingable in a radial direction, and a plurality of front petals connected to a tip end of the rear petal so as to be swingable in a radial direction. A tip cone connected to the tip of the front petal, a front blade provided at the rear end of the front petal, a rear blade provided at the front end of the rear petal immediately after the front blade, An underground pipe replacement device comprising an actuator for swinging the front petal and the rear petal.   3. The underground according to claim 1, wherein the actuator is installed on a central axis at the rear of the head, and a leading end portion of the ram of the actuator and the front petal or the rear petal are connected by a link. Tube replacement device.   Side protrusions are provided on both sides of the front petal and the rear petal, respectively, and the side protrusions slidably overlap with side protrusions of adjacent front petals and rear petals. Item 4. The underground pipe replacement device according to item 1, 2 or 3.

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