JP3981044B2 - Rehabilitation method of sewer pipe and inner pipe for rehabilitation of sewer pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for rehabilitating a large-diameter sewer pipe buried in the ground and an inner pipe for rehabilitation of a sewer pipe .
[0002]
[Prior art]
Among the underground pipes buried in the ground, fume pipes manufactured by utilizing centrifugal force are mainly used. Such sewage pipes are strong but weak against acid, easily corroded by hydrogen sulfide gas etc. stagnant in the pipes, etc. There is.
[0003]
Therefore, the sewer pipes are regularly inspected and repaired or replaced according to the state of the sewer pipes.
[0004]
[Problems to be solved by the invention]
By the way, there is a method of applying mortar when rehabilitating a sewer pipe, but since it is a manual operation, there is a problem that efficiency is poor and much labor is required.
[0005]
On the other hand, in the method of replacing an old drainage pipe with a new drainage pipe, it is necessary to dig up the ground. There is a problem of becoming.
[0006]
An object of the present invention is to provide a method for rehabilitating a sewer pipe and an inner pipe for rehabilitation of a sewer pipe that can efficiently repair an old drainage pipe in a very short time without cutting. It is.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, Oite the rehabilitation process of sewer according to the present invention, the upstream side of the manhole to the sewer, which is buried in the ground, which is connected to the sewer, Stopping water at the downstream side of the manhole provided on the downstream side of the manhole, securing a work space between the water stop portions, and sewage blocked by the upstream water stop portion of the work space. a step of temporarily piping the water pipe leading to the downstream side of the downstream-side waterproof part, forming an inner tube inside the sewage sewer that put the working space, of the outer periphery sewer of the inner tube It consists of the steps of filling the gap formed between the circumferences with a cement-based filler to fix the inner pipe and renew the strength of the pipe, and the inner pipe has a joint piece on one end surface in the circumferential direction, An engagement groove is provided on the inside, a joint piece on the other end surface in the circumferential direction, and on the outside An arc-shaped split ring made of a synthetic resin molded article in which a joint groove is provided and a flange portion that can be engaged with the engagement groove is formed at the end of each joint piece is connected with the engagement of the flange portion with the engagement groove. Then, a configuration is adopted in which a ring is formed by connecting in the circumferential direction by driving two wedges into a space formed between the flange and the opposite portion of the flange at the tip of the joint piece .
Further, in the inner pipe for rehabilitation of the sewer pipe according to the present invention, a joint piece is provided on one end surface in the circumferential direction of the arc-shaped split ring made of a synthetic resin molded product, and an engagement groove is provided on the inner side thereof, In addition, a joint piece is provided on the other end surface in the circumferential direction of the split ring, and an engagement groove is provided on the outer side thereof. A flange that can be engaged with the engagement groove is formed at the tip of each joint piece. Are connected in the circumferential direction by engaging the flange with the engaging groove and driving the two wedges into the space formed between the flange and the opposite portion of the flange at the tip of the joint piece. The configuration was adopted.
[0008]
If comprised as mentioned above, the old drainage pipe dredging can be efficiently renovated completely in a very short time by non-cutting. In addition, the drainage pipe after renovation has a three-layer structure of existing pipe, cement-based filler layer, and inner pipe, and it is possible to obtain a drainage pipe with excellent strength and durability. Since it is made of a synthetic resin, the flow of sewage is smooth, the amount of sediment deposited is small, and sewage can be disposed of very smoothly.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a drainage pipe 1 embedded in the ground is composed of a connecting body of a tubular body such as a fume pipe, and the drainage pipe 1 has a plurality of manholes spaced in the length direction thereof. 2a and 2b are connected.
[0010]
When repairing the drainage pipe 1 by aging or the like, first, in the first step, water is stopped at the upstream side of the upstream manhole 2a and the downstream side of the downstream manhole 2b, and hydrogen sulfide gas, carbon monoxide, etc. Block the inflow of harmful gases.
[0011]
At the time of water stoppage, here, cylindrical elastic tubes 4 that are expanded by the supply of compressed air are attached to both ends of the water flow tube 3 formed by connecting short tubes, and the water flow tube 3 is disposed in the drain pipe 1. Then, one elastic tube 4 provided at both ends thereof is positioned on the upstream side of the upstream manhole 2a and the other elastic tube 4 is positioned on the downstream side of the downstream manhole 2b, and then compressed air is supplied. Thus, each elastic tube 4 is expanded so that the outer periphery thereof is brought into close contact with the inner peripheral surface of the drain tube 1.
[0012]
The work space 5 is secured between the water stop portions (elastic tubes 4) by the water stop in the drain pipe 1 and the sewage blocked by the upstream water stop portion 4 in the work space 5 downstream. A water pipe 3 that guides to the downstream side of the side water stop 4 is temporarily provided.
[0013]
Here, when passing sewage into the water pipe 3, it may be allowed to flow naturally, or, as shown in FIG. 1, the upstream end of the water pipe 3 is connected to the discharge port of the pump 6, Water may be forcibly passed by driving the pump 6.
[0014]
After the water stop in the drain pipe rod 1, repair work is performed in the work space 5 secured between the water stop portions. During the work, if harmful gases such as hydrogen sulfide gas and carbon monoxide are stagnant in the work space 5, there is a risk of causing an poisoning accident.
[0015]
In order to prevent such a disaster from occurring, the end of the air supply pipe 7 inserted into one manhole 2a is connected to the blower 8 disposed on the ground, and the blower 8 is driven to drive the inside of the work space 5 External air is supplied to Further, the end of the suction pipe 9 inserted into the other manhole 2b is connected to a suction blower 10 disposed on the ground, and the air in the work space 5 is exhausted to the ground by driving the blower 10 The space 5 is ventilated.
[0016]
In the second step, after the water stop and the provisional piping of the water pipe 3, the inner peripheral surface of the drainage pipe 1 in the work space 5 is cleaned to remove deposits and deposits.
[0017]
After the completion of the cleaning operation, in the third step, the inner pipe 11 made of synthetic resin is assembled in the drain pipe 1.
[0018]
When the inner tube 11 is assembled, the split ring 12 shown in FIGS. 9 and 10 is employed. The split ring 12 has an arc shape and is formed of a synthetic resin. A thermoplastic resin such as polypropylene or polyethylene is employed as the synthetic resin.
[0019]
As shown in FIG. 5, a joint piece 13a is provided on one end surface in the circumferential direction of the split ring 12, and an engagement groove 14a is provided on the inner side thereof, and a joint piece 13b is provided on the other end surface, and an engagement groove is provided on the outer side thereof. 14b is formed, and a flange 15 that can be engaged with the engaging grooves 14a and 14b is provided at the tip of each joint piece 13a and 13b.
[0020]
As shown in FIGS. 9 and 10, a large number of rectangular recesses 16 are provided at equal intervals in the circumferential direction and the axial direction on the outer peripheral surface of the split ring 12, and protrusions 17 made of screws are provided on the bottom surface of each recess 16. ing.
[0021]
Further, a plurality of engagement holes 18 penetrating the recess 16 are provided on one end surface in the axial direction of the split ring 12, and a bifurcated engagement that can be engaged with the engagement hole 18 on the other end surface in the axial direction. A nail 19 is provided.
[0022]
When the inner pipe 11 is assembled in the drain pipe 1, the ring 20 is formed by the plurality of split rings 12, and the rings 20 are sequentially connected in the axial direction. When the ring 20 is formed, as shown in FIG. 10, the flange portion 15 of the joint piece 13 a provided on one end surface of the split ring 12 is formed in the engagement groove 14 b formed on the other end surface of the other split ring 12. A plurality of split rings 12 are combined in a circular shape so as to engage with each other, and two wedges 22 are driven into a rectangular space 21 formed between opposing portions of the flange portion 15 to connect adjacent split rings 12 to each other. To do. Due to the coupling, the abutting surfaces of the split ring 12 are in close contact with each other. In order to enhance the adhesion effect, the abutting surface of the split ring 12 may be bonded or welded.
[0023]
When the rings 20 formed by joining the plurality of split rings 12 are connected to each other, the engagement holes 18 provided on one end surface in the axial direction of the split ring 12 are engaged with the engagement holes 18 formed on the other end surface in the axial direction of the split ring 12. The nail 19 is inserted.
[0024]
When the engagement claw 19 is inserted into the engagement hole 18, the bifurcated engagement claw 19 is elastically deformed in the width direction at the time of insertion, and the flange portion 19 a at the tip of the engagement claw 19 passes through the engagement hole 18. Then, when facing the square recess 16, the engaging claw 19 is restored to the outer shape, and the flange 19 a is engaged with the inner surface of the recess 16. By the engagement, the rings 20 can be sequentially connected in the axial direction with the side surfaces in close contact with each other, and the inner pipe 11 can be assembled in the drain pipe 1 as shown in FIG.
[0025]
When the inner pipe 11 is assembled, the rings 20 are connected to each other so that the abutting surfaces of the split rings 12 are shifted from each other by a half pitch phase in the circumferential direction as shown in FIG. By doing so, the inner pipe | tube 11 with high intensity | strength can be obtained. In order to further increase the strength and enhance the adhesion between the side surfaces of the ring 20, the side surfaces of the ring 20 may be bonded or welded together.
[0026]
As shown in FIG. 3, when the inner pipe 11 is assembled in the drain pipe 1, the pump 23 is then installed on the ground, and the end of the supply pipe 24 connected to the pump 23 is provided in the split ring 12. The high-strength cement-based filler such as mortar is pumped into the gap formed between the drain pipe 1 and the inner pipe 11 by driving the pump 23.
[0027]
When injecting the cement-based filler into the gap, both ends of the gap are closed in advance, and the remaining inlets 25 other than the inlet 25 to be used are closed by attaching a removable plug, Prevents leakage of cementitious filler injected into the gap.
[0028]
4 and 5 show a state in which the cement-based filler 26 is pumped into the gap. The cement-based filler 26 fills the entire gap formed between the drain pipe 1 and the inner pipe 11 and also enters into the recess 16 formed on the outer peripheral surface of the split ring 12. Since a projection 17 made of a screw is provided in 16, the inner pipe 11 and the drain pipe 1 are firmly joined via a cement filler 26, and the drain pipe trough is cured by curing the cement filler 26. 1 repair work is completed.
[0029]
The drainage pipe newly formed by the repair has a three-layer structure including the existing drainage pipe 1, the cement-based filler 26 and the inner pipe 11, and therefore is extremely strong and the inner pipe 11 through which sewage flows. Is formed from a synthetic resin, the resistance to water flow is extremely small, the sewage can flow smoothly, the sediment does not accumulate in the pipe, and the sewage can be discharged and disposed of smoothly.
[0030]
In the embodiment, the repair of the sewer pipe on a straight line has been described as an example. However, when a bent portion exists in the sewer pipe, the inner pipe provided inside the sewer pipe also has a bent portion of the sewer pipe. A curved pipe portion is formed at a corresponding position. When forming the curved pipe portion, a plurality of arc-shaped split rings having different width dimensions are sequentially connected in the circumferential direction to form a tapered ring having one end surface inclined with respect to the other end surface. Are sequentially connected so that the end faces meet.
[0031]
【The invention's effect】
As described above, in the present invention, the inner pipe is assembled in the aging drainage pipe and the cement filler is pumped into the gap formed between the inner pipe and the drainage pipe. It is possible to renovate the entire drainage pipe in an extremely efficient manner in a very short period of time, and it is possible to perform the refurbishment work only by opening and closing the existing sewage lid without excavation.
[0032]
In addition, water is stopped at the upstream side and downstream side in the repair section in the drainage pipe, and a water pipe is temporarily installed between the water stop sections, so that the repair work can be performed in a state of ensuring the flow of sewage. At the same time, the sewage does not affect the assembling of the inner pipe, the injection of the cement filler and the curing, and a drain pipe with excellent durability can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing a state in which a drainage pipe is stopped in the rehabilitation method according to the present invention. FIG. 2 is a longitudinal front view showing a state in the middle of assembling an inner pipe in the drainage pipe. Longitudinal front view of cement filler filled in the gap formed between the tub and inner pipe [Fig. 4] Longitudinal side view of cemented filler filled between the drain tub and inner pipe FIG. 5 is an enlarged cross-sectional view showing a part of FIG. 4. FIG. 6 is a partially cutaway plan view showing a part of the inner tube shown in FIG. 4. FIG. 7 is a cross section taken along line VII-VII in FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 6. FIG. 9 is an exploded perspective view showing a split ring. FIG. 10 is an exploded perspective view showing a split ring and a wedge connecting the split ring. Explanation of]
1 Drainage pipe 2a, 2b Manhole 3 Water pipe 4 Elastic tube (water stop)
5 Working space 11 Inner pipe 12 Split ring 20 Ring 26 Cement filler

Claims (8)

The inside of the sewer pipe buried in the ground is stopped at the upstream side of the manhole connected to the sewer pipe pole and the downstream side of the manhole provided on the downstream side of the manhole. A step of securing a work space therebetween, a step of temporarily piping a water pipe for guiding the sewage blocked by the upstream water stop portion of the work space to the downstream side of the downstream water stop portion, and the work space. a step of forming the inner tube inside the sewage sewer that the immobilization of the inner tube is filled with a cementitious filler in a gap formed between the inner periphery of the outer peripheral and sewer of the inner tube Kanmizo It consists of a process to reinforce strength,
The inner pipe is provided with a joint piece on one end surface in the circumferential direction and an engagement groove on the inside thereof, a joint piece on the other end surface in the circumferential direction, and an engagement groove on the outside thereof. An arc-shaped split ring made of a synthetic resin molded article having a flange that can be engaged with the engagement groove at the tip is formed by engaging the flange with the engagement groove and the flange between the flange and the joint piece tip. A method for rehabilitating a sewer pipe , characterized in that a ring is formed by connecting two wedges into a space formed between opposing parts in the circumferential direction .   2. The structure according to claim 1, wherein the ring is configured to be sequentially connected in the axial direction by inserting a bifurcated engagement claw provided on the other end surface in the axial direction into an engagement hole formed in one end surface in the axial direction. Rehabilitation method for sewer pipes.   The method for rehabilitating a sewer pipe according to claim 1 or 2, wherein the split ring has a large number of concave portions on an outer peripheral surface.   The method for rehabilitating a sewer pipe according to any one of claims 1 to 3, wherein a protrusion is formed on the bottom surface of the recess.   A joint piece is provided on one end surface in the circumferential direction of an arc-shaped split ring made of a synthetic resin molded product, and an engagement groove is provided on the inner side thereof. An engagement groove is formed at the tip of each joint piece, and a flange that can be engaged with the engagement groove is formed at the tip of each joint piece. An inner pipe for rehabilitation of a sewer pipe rod that is connected in the circumferential direction by driving two wedges into the space formed between the opposing portions of the flange portion at the tip of the joint piece.   Rings formed by connecting a plurality of split rings are sequentially connected in the axial direction by inserting bifurcated engagement claws provided on the other end surface in the axial direction into engagement holes formed in one end surface in the axial direction. The inner pipe for rehabilitation of the sewage pipe basin according to claim 5.   The sewage pipe rehabilitation inner pipe according to claim 5 or 6, wherein the split ring has a large number of recesses on an outer peripheral surface.   The inner pipe for rehabilitation of the sewer pipe according to any one of claims 5 to 7, wherein a protrusion is formed on the bottom surface of the concave portion.

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