JPH08142195A - Lining method for manhole - Google Patents

Abstract

PURPOSE: To form a uniform gap between a manhole and a profile when the manhole is lined by a banded profile. CONSTITUTION: A plurality of frames are disposed vertically along the inner periphery of a manhole 10, and the frames are circumferentially connected by a plurality of wire materials. The wire materials 42 are fixed to the inner periphery of the manhole 10, and a spacer 40 is disposed in the manhole 10. In such a state, the profile 20 having flexibility is introduced into the manhole 10, and spirally disposed along the spacer 40. The profile 20 covers the inner periphery of the manhole 10 in the state that the inner periphery of the manhole 10 is spaced at a predetermined gap by the spacer 40. Thereafter, the lining material 60 is filled in the gap between the inner periphery of the manhole 10 and the spacer 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining method for a manhole in which the inner peripheral surface of the manhole is lined with a flexible strip-shaped profile.

[0002]

2. Description of the Related Art Manholes in sewers usually have a concrete structure and deteriorate over time due to corrosion, external pressure, reaction of hydrogen sulfide in sewage with alkali, and cracks and damages occur. Groundwater intrudes into cracked or damaged manholes, so that in rainy weather, sewage that exceeds the treatment capacity of the sewage treatment plant may flow into the sewage treatment plant.

For this reason, it is necessary to rehabilitate the manhole. However, when removing old manholes and reconstructing them with concrete, etc., it is necessary to excavate the manholes and also to cut off the traffic on the roads where the manholes open for a long period of time. ,
It is extremely difficult in reality.

For such a method, Japanese Patent Laid-Open No. 5-24
No. 7993 discloses that a bottomed tubular lining material made of low-density polyethylene is inserted into an existing manhole in a state of being folded small, and heating steam is introduced into the lining material to form a tubular lining material into a tubular shape. There is disclosed a method of lining the inside of the manhole by cooling and solidifying the restored lining material. In this lining method, after the cylindrical lining material has cooled and solidified, a heater is placed on the bottom wall of the lining material to soften it, and the softened bottom wall is pressed to form it along the shape of the invert at the bottom of the manhole. It is supposed to do.

[0005]

SUMMARY OF THE INVENTION In the manhole lining method disclosed in the above publication, a step of introducing heating steam for restoring the tubular lining material inserted into the manhole into a tubular shape, and the bottom wall of the manhole are provided. A heating process for forming a shape along the invert inside is required, and the construction work is troublesome, and it takes a long time to cool and solidify the heated tubular lining material, and the workability is poor, There is also a possibility that the traffic cutoff time on the road will be longer.

Further, the tubular lining material cannot be in a state of being uniformly adhered to the entire inner peripheral surface of the manhole. Therefore, when the backfill material is filled between the inner surface of the manhole and the tubular lining material, there is also a problem that the backfill material cannot be uniformly filled. Further, since the tubular lining material that is in close contact with the inner peripheral surface of the manhole shrinks over time, the space between the inner peripheral surface of the manhole and the cylindrical lining material, or between the backfill material and the inner peripheral surface of the manhole and the cylindrical lining material. There may be a gap between the material and the material.

The present invention solves such a problem, and its purpose is to shorten work time for road traffic due to its good workability, and further, to further improve the workability between the lining material and the inner peripheral surface of the manhole. It is an object of the present invention to provide a lining method in a manhole that can be easily filled with a backfill material.

[0008]

A method for lining a manhole according to the present invention is designed such that a flexible strip-shaped profile is introduced into the manhole so that the inner peripheral surface of the manhole is covered with the profile. When arranging spirally along the inner peripheral surface of the manhole, a spacer is arranged in advance along the inner peripheral surface of the manhole so that an appropriate interval is formed between the inner peripheral surface of the manhole and the profile. The above object is achieved thereby.

[0009]

In the lining method for manholes according to the present invention,
In advance, with the spacers arranged along the inner peripheral surface of the manhole, the flexible profile introduced into the manhole is closely attached in a spiral shape along the spacers arranged along the inner peripheral surface of the manhole. , Lining with a profile with a proper gap to the inner surface of the manhole. As a result, the inner peripheral surface of the manhole is lined by a simple work in the manhole without requiring a special device or the like.

After that, when the backfill material is filled between the inner peripheral surface of the manhole and the profile, the backfill material is smoothly filled in the gap uniformly formed between the inner peripheral surface of the manhole and the profile. To be filled.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 1, the method for lining a manhole according to the present invention is such that the upper part has a circular truncated cone shape whose inner diameter gradually decreases toward the upper side, and the lower side of the circular truncated cone shape has a cylindrical shape with a constant inner diameter. Manhole 1
It is carried out to line the inner peripheral surface of zero.

In the lining method of the present invention, first, the invert formed on the bottom of the manhole 10 is removed. The invert is a groove having a semicircular cross section that is linearly arranged between a pair of the sewers 12 that are in communication with each other in the manhole 10 and that is inclined so that the groove is on the lower side on each side of the groove. It is composed of the bottom surface of the manhole 10. Each end surface of the groove is in alignment with the lower part of each end surface of each sewer 12.

When such an invert is removed, a water stopcock 30 is attached to each end of the sewer pipes 12 communicating with the manhole 10. The stopcock 30 is the sewer pipe 1
If you can make the end of 2 water-stop,
It may have any structure, and in this embodiment, a vinyl chloride disc is used.

When each end of the sewer pipe 12 is stopped by the water stopcock 30, inside the manhole 10,
A spacer 40 is arranged along the inner peripheral surface of the lower portion of the manhole 10 having a cylindrical shape. The spacer 40 includes a plurality of frame members 41 arranged vertically along the inner peripheral surface of the manhole 10, and a plurality of wire members 42 such as wires for fixing each frame member 41 to the inner peripheral surface of the manhole 10. have. Each of the wire rods 42 is attached to the inner peripheral surface of the manhole 10 in a state where the frame members 41 are connected in the horizontal direction along the circumferential direction of the manhole 10 at different height positions in the vertical direction. There is.

In this state, as shown in FIG. 2, the entire inner peripheral surface of the manhole 10 is lined with a flexible strip-shaped profile 20.

FIG. 3 is a cross-sectional view of the profile 20 adhered to the inner peripheral surface of the manhole 10. The profile 20 has a strip-shaped substrate body 21 whose inner surface is flat. One side edge of the substrate body 21 is continuous with the step portion 22 located outside by the thickness of the substrate body 21. At a side edge of the step portion 22 opposite to the substrate body 21 side, a positioning rib 23 bent outward in a perpendicular state is formed.
Are provided along the longitudinal direction of the profile 20.

The other side edge portion of the substrate body 21 is provided with a hinge portion 21a thinner than the thickness of the substrate body 21,
The strip-shaped folded-back portion 24 is folded back along the flat inner surface of the substrate body 21. This folded part 2
In the vicinity of the side edge portion of 4, the fitting protrusion 25 that protrudes in the direction opposite to the inner surface of the substrate body 21 is provided along the longitudinal direction. The fitting protrusion 25 is configured such that an insertion portion 25b having a semicircular cross section is provided at a tip end portion of a column portion 25a standing upright with respect to the folded portion 24.

A fitting rib 26 having a cross-sectional space 26a into which the fitting projection 25 can be fitted is provided at the side edge of the step portion 22 on the substrate body 21 side so as to project outward. Has been. The fitting rib 26 is configured such that a flange portion 26c that is parallel to the step portion 22 is provided outside the fitting portion 26b that protrudes outward in a semicircular cross section surrounding the space portion 26a.

A reinforcing rib 27 having a T-shaped cross section is provided between the positioning rib 23 and the fitting rib 26 of the step portion 22 so as to project outward with respect to the step portion 22.

A contact rib 28 is provided at a side edge portion of the substrate body 21 close to the folded-back portion 25 so as to extend to the outside of the substrate body 21 in a perpendicular state. The abutment rib 28 is provided with a flange portion 28a extending toward the step portion 22 side at the outer tip portion. A pair of reinforcing ribs 29 having a T-shaped cross section and protruding in an orthogonal state to the outside are provided at equal intervals between the contact ribs 28 and the step portion 22 in the substrate body 21.

The profile 20 having such a structure is integrally molded of a flexible synthetic resin such as polyethylene, polypropylene or vinyl chloride, as shown in FIG.
As shown in, the water is continuously supplied through the opening on the ground into the manhole 10 having the water stopcock 30 attached to the end of the sewer pipe 12. The tip of the profile 20 supplied into the manhole 10 is pressed by a worker in the manhole 10 against the spacer 40 arranged along the inner peripheral surface of the manhole 10 in a spiral state. The profile 20 is spirally pressed against the spacer 40 so that the folded-back portion 24 is on the upper side. Then, the folded-back portion 24 arranged on the lower side is rotated upward and fitted into the stepped portion 22 of the upper-side profile 20.
The fitting protrusion 25 is fitted into the space portion 26 a of the fitting rib 26 of the step portion 22 of the folding portion 24. Mating rib 26
The fitting protrusion 25 fitted in the space 26a of the
5c is locked in the fitting rib 26.

In this way, the manhole 1 is attached to the upper side of the profile 20 closely attached to the inner peripheral surface of the manhole 10.
The profile 20 introduced to 0 is arranged adjacently, is brought into close contact with the inner peripheral surface of the manhole 10, and the folded portion 24 is fitted in the step portion 22. By repeating such a process, the profile 20 is lined on the entire inner peripheral surface of the manhole 10.

When the fitting rib 25 is fitted in the fitting rib 26, an adhesive such as urethane resin is applied to the fitting rib 26.

The manhole 10 usually has a frustoconical shape in which the inner diameter gradually decreases toward the upper side, and the lower side of the frustoconical shape has a cylindrical shape with a constant inner diameter. To this end, the profile 20
When the inner peripheral surface of the lower portion of the manhole 10 having a cylindrical shape is lined all over, the profile 20 is cut.

Since the lower end of the profile 20 is in a spiral state with respect to the inner peripheral surface of the manhole 10,
A gap is formed between the manhole 10 and the bottom surface of the manhole 10.
When the lower inner peripheral surface of 0 is covered, a water blocking material 50 such as an epoxy resin is filled in the gap, and water blocking is performed over the entire circumference.

After that, the profile 20 and the manhole 1
0 from the upper end of the profile 20 into the gap formed by the spacer 40 with the inner peripheral surface of the backfill material 60.
Is filled. Since a uniform gap is formed between the profile 20 and the inner peripheral surface of the manhole 10 by the spacer 40, the backfill material 60 is provided.
Is smoothly filled in the gap.

When the backfill material 60 is filled in the gap between the profile 20 and the inner peripheral surface of the manhole 10, the profile 20 is spirally formed on the conical upper inner peripheral surface of the manhole 10, if necessary. Lining by closely contacting with.

When the backfill material 60 filled in the gap between the profile 20 and the inner peripheral surface of the manhole 10 hardens,
As shown in FIG. 5, the sewer pipe 12 fitted with the water stopcock 30.
The portions of the profile 20 facing each other are removed in a circular shape to form the openings 31, and the backfill material 60 between the water stopcock 30 mounted in the sewer pipe 12 and the profile 20 is removed. . And the sewer pipe 12
The water stopcock 30 mounted inside is also removed from the inside of the sewer pipe 12 so that the inside of the profile 20 and the sewer pipe 12 are in communication with each other, and the opening 31 provided in the profile 20 and the sewer pipe 12 are connected to each other. The space between them is surrounded by the backfill material 60.

Thereafter, an invert is constructed with concrete in the profile 20 at the bottom of the manhole 10. Profile 20 for the constructed invert
Grooves having a semicircular cross-section that are aligned with the lower end portions of the openings 31 are formed between the openings 31 formed in.

The frame member 41 of the spacer 40 arranged vertically along the inner peripheral surface of the manhole 10.
As shown in FIG. 6 (a), the protruding portion 4 that is fitted and engaged between the pair of adjacent reinforcing ribs 27 of the profile 20.
By providing 1a at a predetermined height position, when the profile 20 is pressed against the frame member 41, the reinforcing rib 2
If the projection 41a is fitted between the seven, the profile 20
Are reliably supported by the frame member 41. Further, instead of such a protruding portion 41a, as shown in FIG. 6B, a recess 41b into which the reinforcing rib 27 of the profile 20 is fitted may be provided in the frame member 41.

FIG. 7 is a perspective view showing another embodiment of the profile used in the manhole lining method of the present invention. The profile 50 includes a strip plate-shaped substrate body 51, fitting portions 52 respectively arranged at respective side edges on the back surface side of the substrate body 51, and a back surface of the substrate body 51 between the fitting portions 52. And a plurality of reinforcing ribs 53 arranged at equal intervals.

Each of the reinforcing ribs 53 has a T-shaped cross section, and the pillar portion 53 is vertically raised from the substrate body 51.
a and a flange portion 53b provided at the tip of the column portion 53a so as to be parallel to the substrate body 51.
Each flange part 53b is located in the same plane.

Each fitting portion 52 has a rising portion 52a which is raised from each side edge of the substrate body 51 at a right angle, and a connecting portion 52b which is bent outward at a right angle from the tip of the rising portion 52a. , A tip portion 52c bent at a right angle from the tip of the connecting portion 52b to the substrate body 51 side. A protruding portion 52d protruding toward the rising portion 52a is provided at the tip of the tip portion 52c. The connecting portion 52b of each fitting portion 52 is the flange portion 5 of each reinforcing rib 53.
It is located in the same plane as 3b, and a recess 52e is formed between the rising portion 52a and the tip 52c.

Such a profile 50 is spirally adhered to the inner peripheral surface of the manhole 10, and the rising portions 52a of the fitting portions 52 of the adjacent profiles 50 are butted against each other, and the profile 50 shown in FIG. The band-shaped fitting member 60 shown in the figure is fitted into the pair of fitting portions 52 that are butted against each other, so that the side edges of the adjacent profiles 50 are engaged with each other.

The band-shaped fitting member 60 has a U-shaped fitting cross section having insertion ribs 61 on each side edge.
The respective insertion ribs 61 are fitted in the respective recesses 52e of the pair of fitting portions 52 in which the rising portions 52a are butted against each other. Between each of the insertion ribs 61, a recessed portion 62 having a cross-sectional shape that matches the cross-sectional shape of the tip end portion 52c and the protruding portion 52d of the pair of fitting portions 52, in which the rising portions 52a are butted against each other, is provided. There is.

As shown in FIG. 9, the profile 50 of this embodiment is spirally adhered to the inner peripheral surface of the manhole 10 so that the rising portions 52a of the fitting portions 52 of the adjacent profiles 50 are projected. When brought into contact with each other, the insertion ribs 61 of the strip-shaped fitting member 60 are inserted into the recesses 52e of the fitting portions 52 by the worker who has entered the manhole 10.
The distal end portion 52c and the protruding portion 52d of each fitting portion 52 are inserted into the inside of the concave portion 62 of the fitting member 60. As a result, as shown in FIG. 10, the adjacent profiles 50 are brought into engagement with each other.

The spacer 40 is not limited to the structure in which the linear frame member 41 is assembled with the wire member 42 as in the above-described embodiment, but for example, a metal mesh is arranged along the inner peripheral surface of the manhole 10. Alternatively, a foldable frame member that is assembled in a cylindrical shape in advance may be carried into the manhole 10 and assembled.

Further, in the above embodiment, the manhole 1 with the invert provided at the bottom of the manhole removed
Although the inside of 0 is lined, the inner peripheral surface of the manhole 10 may be lined with the profile 20 without removing the invert. In this case, since the inner peripheral surface of the manhole above the invert is lined with the profile 20, the end surface of each sewer pipe 12 that opens into the manhole is covered with the profile 20 only at the upper portion. Therefore, the backfill material 60 is filled between the profile 20 and the inner peripheral surface of the manhole 10, and then the profile 20 portion covering the upper portion of the sewer pipe 12 is removed to form the profile 20 and the invert groove portion. The space between them is waterproofed with cement, epoxy resin, or the like.

When the inner peripheral surface of the manhole 10 is lined without removing the invert, when the invert is severely damaged, the surface of the invert is covered with a cover member made of polyethylene or the like. May be fixed to the invert.

[0040]

As described above, according to the manhole lining method of the present invention, the manhole inner peripheral surface can be formed only by introducing the flexible profile into the manhole and arranging the manhole inner surface in a spiral shape. Since it can be lined, no special device for heating or cooling is required, and the work in the manhole is simple, and the work efficiency is significantly improved. Furthermore, since the inner peripheral surface of the manhole and the profile are uniformly spaced by the spacer, the backfill material can be uniformly and smoothly filled in the gap.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a manhole showing one step in an embodiment of a method for lining a manhole according to the present invention.

FIG. 2 is a vertical sectional view of a manhole in another step of the lining method.

FIG. 3 is a cross-sectional view of a profile used in the lining method.

FIG. 4 is a vertical sectional view of a manhole showing still another step of the lining method.

FIG. 5 is a vertical cross-sectional view of a manhole showing still another step of the lining method.

6 (a) and 6 (b) are cross-sectional views of a main part of another embodiment of the spacer used in the lining method, respectively.

FIG. 7 is a perspective view of another embodiment of a profile used in the lining method of the present invention.

FIG. 8 is a perspective view of a mating member used with that profile.

FIG. 9 is a perspective view of a main part for explaining the profile and the usage state of the fitting member.

FIG. 10 is a cross-sectional view showing the profile and the usage state of the fitting member.

[Explanation of symbols]

 10 Manhole 12 Sewer 20 Profile 21 Board Body 22 Step 25 Fitting Ridge 26 Fitting Rib 30 Water Stopper 40 Spacer 41 Frame Material 42 Wire Material 50 Water Stopping Material 60 Backfilling Material

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area E03F 7/00 F16L 55/16 58/16

Claims (1)

[Claims] 1. When a flexible strip-shaped profile is introduced into a manhole and the profile is spirally arranged along the inner peripheral surface of the manhole so that the inner peripheral surface of the manhole is covered with the profile. A lining method in a manhole, characterized in that a spacer is previously arranged along the inner peripheral surface of the manhole so that an appropriate space is formed between the inner peripheral surface of the manhole and the profile.