JP2006181862A - Regeneration method of existing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure desired design strength by avoiding the adhesion failure of an existing pipe 2 and a spiral pipe 5 or the deformation of the spiral pipe 5 if high external water pressure is applied to the existing pipe 2 from its outer diameter side before a back-filling material 7 is cured in a regeneration method of the existing pipe 2 employing the so-called pipe making simultaneous back-filling system. <P>SOLUTION: The through-hole (center hole of a through-hole member 15) reaching at least the inner surface of the existing pipe 2 from the inner surface side of the spiral pipe 5 is provided to the spiral pipe 5 formed in a pipe making process and the layer of the back-filling material 7. In this case, for example, if a crack is formed to a part of the existing pipe 2, external water penetrates into the layer of the back-filling material 7 on an inner diameter side from the crack of the existing pipe 2 according to circumstances when the external water pressure to the existing pipe 2 is raised accompanied by a rise in the water level of the ground water or the like in the vicinity of the existing pipe 2 but, since the penetrated external water is allowed to flow out to the inner diameter side of the spiral pipe 5 from the through-hole, the external water is hardly mixed with the back-filling material 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention, for example, a sewer pipe, a water pipe, a gas pipe, an agricultural water pipe, and the like, while a long belt-like body is helically fitted to the inner surface of a pipe wall (existing pipe) buried in the ground, The present invention relates to a method of rehabilitating an existing pipe by injecting a backfilling material between the spiral pipe and the existing pipe while joining the parts.

  Rehabilitate existing pipes when the existing pipes are old or broken. As a conventional existing pipe rehabilitation method, for example, an SPR method using a pipe making simultaneous back-in method is known (for example, see Patent Document 1).

For example, as shown in FIG. 2 and FIG. 3 used in the embodiment, this method uses a pipe making machine 20 installed in the existing pipe 2 to form a long strip having flexibility on the inner surface of the existing pipe 2. (Profile) A pipe making machine 20 is formed in the gap 6 between the existing pipe 2 and the spiral pipe 5 while the spiral pipe (rehabilitated pipe) 5 is formed by fitting both side edges of the 5a in a spiral shape. The existing pipe 2 and the spiral pipe 5 are integrated by inserting a filling nozzle 28 and filling and filling the backfilling material 7 such as mortar and curing the backfilling material 7 after a predetermined curing period. .
Japanese Patent Publication No. 3-48392

  For example, as in the above-described conventional example, the level of groundwater or the like in the vicinity of the existing pipe 2 rises from the time when the existing pipe 2 is renewed until the backfilling material 7 is cured, and a high external water pressure is applied to the existing pipe 2. May be granted. In such a situation, if a crack is generated in the existing pipe 2, the outside water may enter the existing pipe inner diameter side from the cracked portion, resulting in poor adhesion of the spiral pipe 5 to the existing pipe 2. There is a fear. Further, the backfill material 7 may flow due to the external water pressure from the outer diameter side of the existing pipe 2, and the spiral pipe 5 may be deformed.

  The present invention is a method of rehabilitating an existing pipe of the so-called pipe making simultaneous backfilling type, even if a high external water pressure is applied from the outside diameter of the existing pipe before the backfilling material is cured, the existing pipe and the spiral pipe It is intended to ensure a desired design strength by avoiding poor adhesion and deformation of the helical tube.

  The method of rehabilitating an existing pipe according to the present invention is to produce a pipe by joining a long strip-like body in a spiral shape to the inner surface of a pipe burial (existing pipe) buried in the ground, and joining both side edges thereof. However, it is a method of injecting a backfilling material between the spiral tube and the existing tube to rehabilitate the existing tube, and in the pipe making process, the spiral tube and the backfilling material layer are formed in the spiral tube. A through hole extending from the inner surface side to at least the inner surface of the existing pipe is provided.

  In this case, for example, if a crack is generated in a part of the existing pipe, the external water is cracked in the existing pipe when the external water pressure is increased with respect to the existing pipe due to a rise in the level of groundwater or the like in the vicinity of the existing pipe. May penetrate into the backfilling material layer on the inner diameter side, but at this time, since the infiltrated outside water flows out from the through hole to the inner diameter side of the spiral tube, the outside water is mixed into the backfilling material. It becomes difficult. Moreover, since the external water pressure is also leaked from the through hole to the inner diameter side of the spiral tube, deformation of the newly installed spiral tube is suppressed or prevented.

In the rehabilitation method, the through hole can be provided up to a position reaching the outer surface side of the existing pipe.

  In this case, for example, when the external water pressure with respect to the existing pipe rises with the rise in the level of groundwater or the like in the vicinity of the existing pipe, the external water pressure leaks from the through hole to the inner diameter side of the spiral pipe. This suppresses or prevents the existing pipe from being deformed by the external water pressure.

  In the rehabilitation method, the through hole can be closed after the backfill material is cured.

  Moreover, the said through-hole shall consist of a hole drilled so that it may penetrate along the radial direction of the said existing pipe.

  Furthermore, the said through-hole shall be made into the center hole of the through-hole member attached in the state penetrated along the radial direction of the said existing pipe.

  According to the method for rehabilitating an existing pipe according to the present invention, even if a high external water pressure is applied to the existing pipe before the backfill material is cured, poor adhesion between the existing pipe and the helical pipe or deformation of the helical pipe Thus, a desired design strength can be ensured.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In these drawings, 1 is soil, and an existing pipe 2 is embedded in the soil 1 substantially parallel to the ground surface. The existing pipe 2 extends downward from the ground surface of the soil 1 in the vertical direction. The vertical shafts 3 and 4 are connected to each other.

  When the existing pipe 2 is damaged, for example, due to aging or cracking, the existing pipe 2 is renewed in order to restore strength, improve flow-down performance, and improve wear resistance. The existing pipe 2 has various cross-sectional shapes such as a circular shape, a rectangular shape, and a horseshoe shape, and is circular in this embodiment.

  Next, a method for rehabilitating the existing pipe 2 will be described in detail. In this embodiment, the SPR method using the simultaneous backfilling method is adopted.

  In this SPR method using the simultaneous backfilling method of pipe making, in short, a long strip (profile) 5a having flexibility is helically fitted to the inner surface of the existing pipe 2 and both side edges thereof are joined. While creating the spiral tube (rehabilitated tube) 5, the backfill material 7 such as mortar is injected and filled into the gap 6 between the existing tube 2 and the spiral tube 5, and the backfill material 7 is cured after a certain curing period. As a result, the existing pipe 2 and the spiral pipe 5 are integrated.

  Here, the belt-like body 5a is made of a synthetic resin such as hard vinyl chloride, polyethylene, or polypropylene. The backfill material 7 is mortar or the like, and is set to an appropriate water cement ratio so as to be in a highly viscous state when injected.

  In this rehabilitation method, as shown in FIG. 1, since a pipe making machine 20, a profile drum 21, and a mortar feeder 22 are used, these will be briefly described.

The pipe making machine 20 creates the spiral tube 5 by joining the side edges of the strip 5a to the inner surface of the existing tube 2 in a spiral manner and creating the spiral tube 5 between the existing tube 2 and the spiral tube 5. The gap 6 can be filled with a backfilling material 7 such as mortar, and a known material can be used. The pipe making machine 20 is provided with a joining machine (not shown) for joining the strips 5 a, and this joining machine is driven by a drive device 26 mounted on a carriage 25. This drive device 2
6 may be any of a hydraulic type, a pneumatic type, and an electric type, and electric power is supplied from a generator 27 arranged in the vicinity of the shaft 4 on the arrival side in the spiral tube forming direction.

  The profile drum 21 is obtained by winding a profile as the belt-like body 5a, and is a medium type that is taken out from the center side. It may be a go-out type. The profile drum 21 is arranged in the vicinity of the shaft 3 on the starting side in the spiral tube forming direction.

  As shown in FIG. 2, the mortar feeder 22 extrudes mortar by a fixed amount, and the amount of extrusion can be adjusted arbitrarily. This mortar supply machine 22 is mounted on a carriage 25 and is connected to an injection nozzle 28 of the pipe making machine 20 via a hose 29.

  As indicated by the arrow in FIG. 1, the carriage 25 is moved in the spiral pipe forming direction in the existing pipe 2 together with the pipe making machine 20. However, it may be fixedly arranged on the ground.

  In the above embodiment, the profile drum 21 and the generator 27 are arranged on the ground. However, although not shown, the profile drum 21 and the generator 27 are mounted on the carriage in the existing pipe 2 so that they can move together with the pipe making machine 20. May be.

  In this embodiment, in the pipe making process described above, the formed helical tube 5 is provided with installation holes 10 extending from the inner surface side to the outer surface of the existing tube 2 at predetermined intervals in the helical tube forming direction. .

  A through-hole member 15 is attached to the installation hole 10. The through-hole member 15 can be called, for example, a weep hole. As shown in FIG. 5, as shown in FIG. 5, a cylindrical tube body 16, a socket 17 attached to one end side of the tube body 16, and a socket 17 And a lid 18 to be mounted. The lid 18 is disposed on the inner diameter side of the spiral tube 5.

  The lid 18 is cylindrical and has a structure as a check valve. In other words, a closed portion 18a is provided on the inner diameter of the lid 18, and a through hole 18b penetrating in the axial direction is provided at, for example, one location of the closed portion 18a. A valve body 19 made of a rubber material is attached by a stopper 14 such as a screw so as to close the hole 18b.

  In this lid 18, when the air pressure or water pressure on the other side of the closed portion 18a rises, this pressure acts on the valve body 19 through the through hole 18b. Will be elastically swung with the attachment portion of the stopper 14 as a fulcrum to open the through hole 18b, and the pressure and outside water will leak to one side of the blocking portion 18a. However, when the air pressure or water pressure on one side of the closing portion 18a rises, the valve body 19 is pressed against the closing portion 18a, so that the valve body 19 closes the through hole 18b.

  That is, the center hole of the cylinder main body 16 and the through-hole 18b constitute the through-hole described in the claims.

  According to the method described above, for example, when the external water pressure F with respect to the existing pipe 2 rises due to an increase in the level of groundwater or the like in the vicinity of the existing pipe 2, the external water pressure F is transmitted from the through-hole member 15 to the spiral pipe 5. It leaks to the inner diameter side of. As a result, the existing pipe 2 is suppressed or prevented from being deformed by the external water pressure F. Therefore, a desired design strength can be ensured for the entire rehabilitation pipe including the existing pipe 2 and the helical pipe 5.

  As described above, if the lid 18 with a check valve is provided, when the water level passing through the inside of the spiral pipe 5 rises after the existing pipe 2 is regenerated, the water passes through the through-hole member 15. Through this, leakage to the outer diameter side of the existing pipe 2 can be prevented.

  Hereinafter, other embodiments of the present invention will be described.

  (1) The installation hole 10 may be simply opened without using the through-hole member 15. In this case, the installation hole 10 becomes the through-hole described in the claims, and the number of parts and installation work can be reduced. However, it is desirable to close the installation hole 10 with the lid 18 with a check valve as described above or a normal lid after curing the backfill material 7.

  (2) As shown in FIG. 6, the installation hole 10 extending from the inner surface side to the inner surface of the existing tube 2 may be provided in the spiral tube 5 installed in the installation process of the band-shaped body 5 a. A through-hole member 15 as shown in FIG. However, the installation hole 10 may be simply opened without using the through-hole member 15.

  According to this example, for example, if a crack 2a occurs in a part of the existing pipe 2, for example, when the external water pressure on the existing pipe 2 rises due to an increase in the level of groundwater or the like in the vicinity of the existing pipe 2, Although water may enter the layer of the backfilling material 7 on the inner diameter side from the crack 2 a of the existing pipe 2, at this time, the entered outside water flows out from the through-hole member 15 to the inside of the spiral pipe 5. Therefore, it becomes difficult for outside water to mix into the backfill material 7. Moreover, since the external water pressure is also leaked from the through-hole member 15 into the spiral tube 5, the newly installed spiral tube 5 is suppressed or prevented from being deformed.

It is explanatory drawing which shows the mode of work in one Embodiment of the rehabilitation method of the existing pipe | tube which concerns on this invention. It is explanatory drawing of the rehabilitation method of the existing pipe by the pipe making simultaneous backfilling method, and is the figure which looked at the pipe making machine from the front. It is explanatory drawing of the rehabilitation method of the existing pipe | tube by the pipe making simultaneous backfilling method, and is a perspective view of the partially broken state which shows a pipe making machine part. It is an arrow view of the (4)-(4) line cross section of FIG. It is a disassembled perspective view which shows the through-hole member of FIG. FIG. 5 is a view corresponding to FIG. 4 in another embodiment of the existing pipe rehabilitation method according to the present invention.

Explanation of symbols

2 Existing pipe (pipe)
5 Spiral tube (rehabilitation tube)
5a Band (profile)
7 Backfilling material 10 Installation hole 15 Through-hole member 18 Lid 20 Pipe making machine

Claims (5)

Between the spiral pipe and the existing pipe, a long belt-like body is helically fitted to the inner surface of the pipe burial (existing pipe) buried in the ground, and both side edges are joined to produce a pipe. Injecting backfill material into the existing pipe to rehabilitate existing pipes,
A method for rehabilitating an existing pipe, characterized in that, in the pipe making process, a through hole extending from the inner surface side of the spiral tube to at least the inner surface of the existing tube is provided in the formed spiral tube and backfill material layer.   The method for rehabilitating an existing pipe according to claim 1, wherein the through hole is provided up to a position reaching the outer surface side of the existing pipe.   The method for rehabilitating an existing pipe according to claim 1 or 2, wherein the through hole is closed after curing the backfill material.   The said through-hole consists of a hole drilled so that it may penetrate along the radial direction of the said existing pipe, The rehabilitation method of the existing pipe in any one of Claim 1 to 3 characterized by the above-mentioned. The said through-hole is made into the center hole of the through-hole member attached in the state penetrated along the radial direction of the said existing pipe, The rehabilitation method of the existing pipe in any one of Claim 1 to 3 characterized by the above-mentioned. .

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