JP3493218B2 - Rehabilitation method of existing sewer and rehabilitation pipe supporting material used for this rehabilitation method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rehabilitating an existing sewer such as a sewer pipe already installed, and a rehabilitating pipe support material used in the method.

[0002]

2. Description of the Related Art Generally, a fume pipe, a ceramic pipe, a cast iron pipe or the like is used as a sewer pipe such as a sewer pipe buried in the ground. The inner wall surfaces of these pipes are corroded by hydrogen sulfide and other corrosive gases and deposits after long-term use, and the pipe thickness is reduced and the strength is lowered. Also, due to ground pressure or ground subsidence, the seam between the pipes may be displaced and a gap may be created, or a crack may occur in a part of the pipe due to overloading, and groundwater etc. may enter the pipe from this part. Or running water flowing in the pipe may leak into the ground.

As a countermeasure for this, a rehabilitation method for the existing pipe, in which a rehabilitation pipe having a diameter smaller than the inner diameter of the pipe is inserted into the existing pipe, and a backfill material such as mortar is injected between the existing pipe and the rehabilitation pipe. Is being implemented. In this method, when the backfill material is injected and filled between the existing drainage pipe and the rehabilitation pipe, the rehabilitation pipe may float due to the action of the injected backfill material, and the meandering and the cross-sectional shape of the rehabilitation pipe may be deformed. The backfill material is injected while the rehabilitation pipe is fixed at a predetermined position in the existing pipe by the support material.

More specifically, referring to the cross-sectional view of the main part shown in FIG. 7, reference numeral 11 in the drawing is an existing pipe culvert formed of a fume pipe, a ceramic pipe, etc. Is a sewer that can enter inside. When performing pipe rehabilitation, first, the inner wall surface 11a of the pipe 11 is cleaned by an inner pipe cleaning wheel, and the inner wall surface 11a is trimmed by a drilling machine or the like as necessary.

Next, while the rehabilitating pipe 12 is manufactured by the rehabilitating pipe manufacturing machine, the rehabilitating pipe 12 is inserted into the pipe 11 and the supporting member 13 installs the rehabilitating pipe 12 at a predetermined position in the pipe 11. The supporting member 13 is composed of, for example, a lateral supporting member 14 that supports the rehabilitating pipe 12 horizontally from the inside and a vertical supporting member 15 that supports the rehabilitating pipe 12 in the vertical direction.

The lateral support member 14 is composed of a columnar portion 14a made of an iron pipe having a threaded portion at one end and a jack portion 14b screwed into the threaded portion. The columnar portion 14a or the jack portion 14b is rotated. As a result, the inner wall surface 12a of the rehabilitation pipe 12 is horizontally pressed from the inside by both ends.

On the other hand, the vertical support member 15 has a columnar portion 15a made of an iron pipe having threaded portions at both ends, one jack portion having a jack portion 15b and the other screw portion having a support nut 15c. It is screwed and the jack part 15b
Contact the bottom of the inner wall surface 12a of the rehabilitating pipe 12, and the upper end 15d of the columnar portion 15a penetrates through an opening (not shown) formed in the rehabilitating pipe 12 and press-contacts with the upper part of the inner wall surface of the pipe 11. Thus, the bottom of the rehabilitating pipe 12 is pressed against the bottom of the pipe 12 to prevent the rehabilitating pipe 12 from rising. Further, the upper part of the inner wall surface 12a of the rehabilitation pipe 12 is configured to be supported from below by a support nut 15c screwed to the other screw portion. If necessary, the lateral support member 14 and the vertical support member 15 are connected to each other by a clamp or the like.

The supporting member 13 having the above-mentioned structure is used for the pipe 1
In order to prevent deformation and floating of the rehabilitation pipe 12 which is assembled in 1 with a gap of about 1 m and is temporarily installed and is disposed in the pipe 11,
In this state, a backfill material injection hole (not shown) is drilled in the rehabilitation pipe 12 with a hole drilling machine, a backfill material injection jig is attached to this hole, and the backfill material 16 is injected, After 16 is hardened, the support material 13 is removed to complete the rehabilitation work of the conduit 11.

[0009]

According to the above-mentioned conventional pipe dip rehabilitation method, a support member composed of a lateral support member and a vertical support member is assembled in the rehabilitation pipe in order to prevent deformation and rising of the rehabilitation pipe. Since the work space is extremely limited due to the temporary construction, workability is poor, and when performing work in a state where running water is allowed in the pipe, running water may increase during the work, or unexpected accidents may occur in the pipe. In case of a situation, it hinders the evacuation of workers and other quick response, and since the inner wall surface of the rehabilitation pipe is locally supported by the lateral support member and the vertical support member, the refill pipe is injected by backfilling material. However, there is a problem that it is not possible to secure a high quality pipe rehabilitation due to bending deformation.

Therefore, an object of the present invention is that the workability of the rehabilitation of the culvert is good, it is possible to promptly respond to an unexpected situation during the work, and the bending deformation of the rehabilitation pipe is suppressed, and the quality of the culvert is high. An object of the present invention is to provide a method for rehabilitating an existing pipe that can be rehabilitated and a rehabilitating pipe support material used in this method.

[0011]

In order to achieve the above object, an existing pipe rehabilitation method according to the present invention comprises a plurality of segments each having an arcuate cross section, which are foldably connected to each other via hinges to define a cylindrical shape. Inside a rehabilitating pipe laid in an existing conduit to be rehabilitated in a state in which a supporting member having a spacer pipe that can be screwed into a threaded portion penetrating the segment and penetrated from the inside to the outside is folded by the hinge. It is carried in to a predetermined position, each segment is expanded into a cylindrical shape via a hinge and pressed against the inner wall surface of the rehabilitating pipe to support it, and a spacer pipe is screwed into the screw part to penetrate the rehabilitating pipe to penetrate the existing rehabilitation pipe. The backfill material is injected between the inner wall surface of the existing pipe and the rehabilitation pipe in a state where the rehabilitation pipe is pressed against the upper part of the wall surface and pressed and fixed to the bottom surface of the inner wall of the existing pipe ditch. The existing pipe support material Prevent the deformation of the rehabilitating pipe by pressing it against the inner wall surface of the rehabilitating pipe laid inside the drainage pipe, and press the rehabilitating pipe against the bottom of the inner wall surface of the existing rehabilitating pipe, and back the inner wall of the existing rehabilitating pipe with the rehabilitating pipe. In the rehabilitating pipe support material used in the rehabilitation method of the existing pipe that injects the filler, with a plurality of segments with an arcuate cross section arranged to press the inner wall surface of the rehabilitating pipe to define the rehabilitating pipe in a cylindrical shape. , A hinge connecting the adjacent segments in a foldable manner, a threaded portion penetrating the segment, and a threaded portion threadably engaged with the threaded portion so that the top portion penetrates the rehabilitation pipe and the inner wall surface of the existing drainage pipe And a spacer pipe that is pressed against the upper part to press and fix the rehabilitation pipe to the bottom of the inner wall surface of the existing pipe.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rehabilitating method for an existing pipe according to the present invention and a rehabilitating pipe support material used in the rehabilitating method according to the present invention is shown in FIG.
It will be described with reference to FIG.

Reference numeral 1 in the figure is an existing sewer pipe, such as a sewer pipe to be rehabilitated, which is buried in the ground and is composed of a plurality of fume pipes, ceramic pipes, cast iron pipes and the like connected as shown in FIG. Both ends of the pipe 1 are connected to the manhole 2.

In the rehabilitation work of the pipe 1, first, the inner wall surface 1a of the pipe 1 is washed with a pipe cleaning car, and the inner wall face 1a is ground with a hole drilling machine or the like as necessary to adjust the shape.

Next, a rehabilitating pipe making machine 3 is installed in one of the manholes 2, and a belt-shaped material 4 made of, for example, vinyl chloride resin supplied from a drum 3a provided on the ground by the pipe making machine 3 is spirally formed. The cylindrical rehabilitation pipe 5 is manufactured by sequentially winding both sides of the both sides with a sealing material interposed therebetween, and the rehabilitation pipe 5 is sequentially inserted and laid in the pipe 1. After laying the rehabilitation pipe 5 over the entire length of the pipe 1 located between both manholes 2, the pipe making machine 3 is carried out from the manhole 2, and the pipe mouth end of the pipe 1 and the rehabilitation pipe which are opened to the manhole 2 Seal the mouth end of tube 5.

Subsequently, the rehabilitation pipe 5 is fixed in the pipe 1 by the rehabilitation pipe support member 6. As shown in the perspective view of FIG. 2, the supporting member 6 has a top segment 7a and a bottom segment 7b each having a predetermined length and a relatively large width and an arc cross section, and an arc segment having a relatively small width. Side segment 7
c, 7d, 7e, 7f, and each segment 7a, 7
b, 7c, 7d, 7e, and 7f are connected to each other by a hinge 8 and are folded small at each hinge 8, and the connecting portions of the side segments 7c and 7d and the connecting portions of the side segments 7e and 7f are connected to each other. Are expanded in directions a away from each other and expanded into a cylindrical shape as shown in the cross section in FIG. 3, thereby defining the cylindrical shape.

Further, each segment 7a, 7b, 7c, 7
The segments are separable from each other by removing the hinge pin 8a of each hinge 8 that connects d, 7e, and 7f to each other, and the segments are connected to each other by inserting the hinge pin 8a of each hinge 8. The end of the hinge pin 8a is bent into an L shape in order to facilitate the insertion and removal of the hinge pin 8a.

An opening 7g and a flanged nut 7h fitted in the opening 7g are attached to the upper portion of the top segment 7a to form a threaded portion as shown in the cross section of FIG. A spacer tube 9 serving as a floating prevention member is screwed and supported by the nut 7h. The spacer tube 9 has a substantially bolt shape having a screw portion 9a screwed into the nut 7h and a hexagonal tool engagement portion 9b, and has an opening (at its base end) connectable to a backfilling material injection jig described later. A hollow portion (not shown) is formed and communicates with a supply hole 9c for backfill material injection, which is opened in the outer periphery of the upper portion.

Next, the supporting member 6 constructed as described above is shown in FIG.
As shown in FIG. 2, the side segments 7c and 7d are connected to each other by an expander or a jack (not shown) by arranging them in a predetermined position in the rehabilitation pipe 5 laid in the pipe 1 in a folded state. The connecting portions of the side segments 7e, 7f are pushed apart in a direction a away from each other and expanded into a cylindrical shape to rehabilitate the rehabilitation pipe 5
On the inner wall surface 5a of each segment 7a, 7b, 7c, 7d,
7e and 7f are pressed and held.

In the state where each segment is expanded into a cylindrical shape, the supporting body is supported unless an inward excessive force acts on the connecting portion of the side segments 7e and 7d or the connecting portion of the side segments 7e and 7f. The 6 is never folded.

Then, a hole drilling machine is inserted through the opening of the nut 7h arranged on the upper portion of the top segment 7a to rehabilitate the rehabilitation pipe 5.
A hole (not shown) for inserting the spacer tube 9 is drilled.

Next, the spacer tube 9 is inserted into and screwed into the nut 7g provided on the top segment 7a so that the top portion 9d of the spacer tube 9 is brought into pressure contact with the upper portion of the inner wall surface 1a of the pipe 1 and the rehabilitation pipe 5 is inserted. The bottom is the inner wall surface 1 of the pipe 1
By maintaining the pressure on the bottom of a, the rehabilitation pipe 5 is prevented from rising and the rehabilitation pipe 5 is fixed (see FIG. 5).

The drilling work for inserting the spacer pipe 9 into the rehabilitating pipe 5 by these boring machines and the fixing work of the rehabilitating pipe 5 by inserting the spacer pipe 9 into the nut 7g are performed in the rehabilitating pipe 5 with a working space. The workability can be improved because it can be secured.

By repeating the same operation, the same supporting member 6 is assembled and disposed in the pipe 1 at intervals of, for example, about 1 m to prevent the rehabilitation pipe 5 from being deformed and floating. Also in the work of disposing the supporting member 6 in the pipe 1, the work space can be obtained in the rehabilitation pipe 5, so that the workability can be improved.

Next, as shown in the cross section of the main part in FIG. 6, a backfill material is provided in the opening provided at the base end of the spacer tube 9 attached to the top segment 7a of the supporting material 6 arranged at a predetermined position. Hose 10a led from an injection device (not shown)
The inner wall surface 1a of the pipe 1 and the outside of the rehabilitation pipe 5 are connected to the backfill material injection jig 10b provided at the tip of the A backfill material is injected between the wall surface 5a and the wall surface 5a.

In accordance with the supply of the backfill material from the supply hole 9c of the spacer tube 9, the backfill material is not connected to the backfill material injection jig 10b through the supply hole 9c, the hollow portion and the opening. The air in the space formed by the pipe 1 to be filled with the filling material and the outer wall surface 5a of the rehabilitation pipe 5 is sequentially discharged, and high-quality backfilling material injection work without residual air pool can be smoothly performed, and By removing the spacer tube 9 from the top segment 7a of the support material 6, the filling state of the backfill material can be visually confirmed, and when the backfill material is insufficiently filled, the spacer tube 9 is again attached to the top segment 7a of the support material 6. It is possible to attach it to the nut 7g and refill the backfill material.

After the backfill material filled in the gap between the pipe 1 and the rehabilitation pipe 5 is hardened, the spacer pipe 9 attached to the top segment 7a of the supporting member 6 is rotated to pull out from the nut 7g, and the side segment The connecting portions of 7c and 7d and the connecting portions of the side segments 7e and 7f are pulled toward each other and folded slightly, or the hinge pin 8a of the hinge 8 that connects each segment is pulled out from the hinge 8 to remove each segment 7a. , 7b, 7c, 7d, 7e and 7
Divide f and carry it out of the manhole 2 and remove it.

After that, a filler such as a backfill material is injected into the hole formed in the backfill material cured after removing the spacer tube 9 and the hole formed in the rehabilitation tube 5 for finishing, and the tube 1 is rehabilitated. To complete.

In the embodiment described above, the supporting member 6 was carried into the manhole 2 in a state of being folded small by the hinges 8. However, depending on the size of the opening of the manhole 2, the size of carrying into and out of the manhole 2 is large. If limited,
The hinge pin 8a of the hinge 8 that connects each segment is pulled out, divided into each segment 7a, 7b, 7c, 7d, 7e, 7f, etc., and loaded into the manhole 2, and again inside the manhole 2, each segment 7a, 7b, 7c, 7d, 7
Assembling the supporting member 6 by connecting e and 7f, or by supporting the supporting member 6 in the manhole 2 into the segments 7a, 7b,
It is also possible to carry out from the manhole 2 by dividing it into 7c, 7d, 7e and 7f.

Further, in this embodiment, the segments 7a, 7b, 7c, 7d, 7e and 7f of the support member 6 are directly pressed against the inner wall surface 5a of the rehabilitation pipe 5 to be supported.
a, 7b, 7c, 7d, 7e, 7f and the inner wall surface 5a of the rehabilitating pipe 5 to protect the rehabilitating pipe 5 from the direct contact of the supporting member 6 by interposing a cushioning material, for example, styrofoam material, In addition, it is also possible to supplement the dimensional error between the inner wall surface 5a of the rehabilitating pipe 5 and the supporting member 6. In this case, a cushioning material such as Styrofoam is used in advance for each segment 7a, 7b7c, 7
The work may be simplified by tensioning the surfaces of d, 7e, and 7f.

According to the existing pipe rehabilitation method and the rehabilitating pipe support material used in this method, the plurality of segments 7a, 7b, 7c, 7d, 7e having an arc-shaped cross section,
7f are connected by a hinge 8, the segments are pushed outward, and the rehabilitation pipe 5 is supported from the inside by a supporting member 6 which is cylindrically held by itself, and a nut 7h provided on the top segment 7a. A bolt-shaped spacer tube 9 is screwed into the top of the tube 1 and the top portion 7d is attached to the inner wall surface 1a
Since the support material 6 is prevented from rising by pressing the back support material and the backfill material is filled between the pipe 1 and the rehabilitation pipe 5, the installation work of the support material 6 is easy and the working time can be shortened. In addition, a work space can be secured in the supporting material 6, workability is further improved, and swift response such as evacuation of workers can be performed in case of an unexpected situation, and the inner wall surface 5a of the rehabilitation pipe 5 Since it is supported over the entire circumference, it is possible to secure high-quality pipe rehabilitation without flexural deformation of the rehabilitation pipe 5 due to backfill material injection.

Further, a back-filling material injection jig is connected to the base end of the space pipe 9 to supply the back-filling material between the pipe 1 and the rehabilitation pipe 5 through a supply hole 9c opening to the outer periphery of the upper portion. By making it possible, the filling work of the backfill material from any supporting material 6 becomes possible, there is no need to newly drill a hole for backfill material filling with a drilling machine, and for the backfill material injection The spacer tube 9 of the supporting member 6 which does not connect the jig acts as an air vent hole, and the filling efficiency of the backfill material is significantly improved. Further, the hole of the nut 7g for mounting the spacer tube or the like is filled when the backfill material is filled. Since it fulfills the function of the state confirmation hole, it has the effect of being able to smoothly and effectively rehabilitate the drainage pipe, which greatly contributes to the rehabilitation of the drainage pipe.

[0033]

As described above, according to the rehabilitating method for an existing pipe and the rehabilitating pipe supporting material used in this rehabilitating method according to the present invention, a plurality of segments having an arcuate cross section are connected by a hinge and the segments are pushed outward. With the support material that is expanded and held in a cylindrical shape by itself, the rehabilitation pipe is supported from the inside over the entire circumference, and the spacer tube supported by the segment prevents the support material and thus the rehabilitation pipe from rising. By filling the backfill material between the pipe and the rehabilitation pipe, the installation work of the support material can be simplified and the work time can be shortened. Will be possible. In addition, since the rehabilitation pipe is supported by the segment over a wide area, it has the effect of preventing the rehabilitation pipe from being deformed due to the injection of backfill material, which greatly contributes to the rehabilitation of the existing culvert. Is.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a rehabilitation method for an existing pipe and a rehabilitation pipe support material used in the rehabilitation method according to the present invention.

FIG. 2 is likewise an explanatory perspective view of a rehabilitation pipe support material.

FIG. 3 is likewise an explanatory cross-sectional view of a rehabilitation pipe support material.

FIG. 4 is likewise a cross-sectional view for explaining an essential part of the rehabilitation pipe support material.

FIG. 5 is likewise an explanatory cross-sectional view of essential parts in which a rehabilitating pipe support material is arranged in an existing pipe.

FIG. 6 is likewise an explanatory cross-sectional view of essential parts in which a rehabilitation pipe support material is arranged in an existing pipe.

FIG. 7 is an explanatory cross-sectional view of a main part for explaining a conventional existing pipe dip rehabilitation method and a supporting material.

[Explanation of symbols]

1 Existing pipe 1a inner wall surface 5 Rehabilitation pipe 6 support materials 7a Top segment 7b bottom segment 7c side segment 7d side segment 7e Side segment 7f side segment 7g nut (screw part) 8 hinges 8a Hinge pin 9 Spacer tube 9c Supply hole 9d top 10b Backfill material injection jig

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Claims (3)

(57) [Claims] 1. A plurality of segments having arcuate cross-sections that define a cylindrical shape and are foldably connected to each other via hinges, and screwed into a threaded portion penetrating through the segments, from inside to outside. the pre-supports having a penetrable spacer tube, and carried into the laid retreaded tube position within the existing sewer to be retreaded in a folded state by the hinge, spread into a cylindrical shape with the respective segment via the hinge rehabilitating pipe and pressed against the wall surface支保the rehabilitating pipe, screwed to the spacer tube to the threaded portion in pressure contact with the existing sewer inner wall surface and caused to penetrate the rehabilitating pipe Te, the spacer
The backfill material was injected into the pipe from its base end, and the inner wall surface of the existing pipe was removed from the supply hole provided in the spacer pipe.
Rehabilitation of existing sewer of injecting back-filling material between the rehabilitating pipe
In the construction method, the screw portion is formed on the top of the supporting member in the supported state.
Made is, the spacer tube screwed in the threaded portion in pressure contact with the upper wall within the existing pipe culverts, pressed and fixed child said rehabilitating pipe into said existing pipe culvert wall bottom
Rehabilitation method of the existing sewer characterized and. 2. The inner wall surface of the existing pipe ditch which is pressed against the inner wall surface of the rehabilitating pipe laid inside the existing water pipe to prevent the rehabilitation pipe from being deformed, and which is pressed against the bottom of the inner wall surface of the existing pipe ditch. in rehabilitating pipe pre-supports to be used for rehabilitation method of the existing sewer of injecting back-filling material between the rehabilitating pipe, arranged said rehabilitating pipe is pressed against the inner wall surface of the rehabilitating pipe so as to define a cylindrical shape A plurality of segments having an arcuate cross-section, a hinge connecting the adjacent segments in a foldable manner, and when the segments are installed in the rehabilitation pipe,
Segments and threaded portion which is formed through the top of, the rehabilitating pipe in pressure contact with the upper wall within the existing sewer tops through said rehabilitating pipe penetrable so screwed in the threaded portion
Possess a spacer tube for pressing and fixing in said existing sewer wall bottom, the spacer tube, back-filling material to the base end in a state of engagement the threaded Note
It has an opening that connects to an input jig,
Rehabilitation pipe support material used in the rehabilitation method for existing pipes, which has a supply hole for injecting the backfilling material that is sent under pressure . 3. The rehabilitation pipe support material according to claim 2 , wherein the hinge pin of each hinge is detachable, and the segments are separated by detaching the hinge pin.