JPH07103602B2 - Manhole 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 manhole such as a sewer system, and more particularly to improving the corrosion resistance and water stopping property.

[0002]

2. Description of the Related Art Conventionally, for example, an existing manhole for an existing sewer system.
As a rehabilitation method to prevent corrosion and stop the water, a method of making a hole in the manhole wall side with a drill and injecting a cement-based or urethane-based grout agent to the outside and cracks and cracks Or a method of applying a synthetic resin coating such as epoxy or tar epoxy to the side wall of the manhole, or a method of obtaining a thickness by troweling or brushing a resin mortar such as an epoxy resin on the side wall of the manhole. Alternatively, a method of assembling a mold inside a manhole and filling a resin mortar between the side wall and the mold is performed.

[0003]

The method of drilling a hole on the manhole wall side and injecting the grouting agent to stop the water is the method of forming concrete straight walls or sloping walls due to the generation of sulfurous acid gas. It has a disadvantage that it is not effective in preventing corrosion. In addition, the grout agent deteriorates or contracts during many years of use, and peels off due to vibration of a vehicle or the like, so that a long-term water blocking effect cannot be expected.

Further, in the method of applying the synthetic resin paint to the side wall of the manhole, sufficient surface treatment must be performed so that the synthetic resin paint adheres to the side wall of the manhole, and the anticorrosion effect is exerted. Had to be applied three times or more, and considering the time interval for repeated application, the construction period was lengthened and there was the disadvantage that it hindered traffic. Further, there is a drawback that the paint of the joint portion is cracked and peeled off due to the vibration of the vehicle or the like.

Also, in the method of applying the resin-based mortar to the side wall of the manhole, it is necessary to sufficiently perform the base treatment, and it takes time for superposition to apply the resin-based mortar thickly. Will be long.

Further, the method of assembling the mold inside the manhole and filling the resin-based mortar between the side wall and the mold requires a long time for assembling and removing the mold, which requires a longer construction period. There was a disadvantage that it would end up.

The present invention has been made in order to solve the above drawbacks, and it is an object of the present invention to provide a method for rehabilitating manholes, which can be constructed in a short time and which can improve the waterproofness and corrosion resistance. It is intended.

[0008]

Means for Solving the Problems
The method of rehabilitation of resin is to heat and soften a thermoplastic resin pipe having an outer diameter slightly smaller than the inner diameter of the straight wall of the manhole to process it into a flat shape, and then change the shape so that the cross-sectional area becomes smaller, The pipe is set inside the manhole, and the upper and lower pipes of the manhole are sealed or communicated with each other.
A heating fluid having a shape recovery temperature or higher and a shape memory temperature or lower is supplied to the inner and outer surfaces of the resin pipe inside the resin pipe to restore the shape of the resin pipe to a cylinder, and the lower portion of the resin pipe whose shape has been restored is fixed to the joint, It is characterized in that the space between the straight wall and the resin pipe is filled with a filler composed of cement mortar, inorganic mortar or organic resin mortar and cured.

[0009]

In the present invention, a thermoplastic resin pipe having an outer diameter slightly smaller than the inner diameter of the straight wall of the manhole is heated at a temperature not lower than the shape recovery temperature and not higher than the shape memory temperature to be softened and processed into a flat shape. The flat resin pipe is rolled or folded so that both ends are close to each other so as to have a small cross-sectional area, and a resin pipe having an outer diameter larger than that of the muzzle of the manhole is inserted through the muzzle of the manhole.

After the resin pipe having the reduced cross-sectional area is set up inside the manhole, the upper and lower pipes of the manhole are sealed or communicated with each other, and then the resin pipe in the manhole is closed. By simultaneously heating the outer surface at a temperature not lower than the shape recovery temperature and not higher than the shape memory temperature, the resin pipe is uniformly heated and the shape is restored to a cylindrical shape.
Stand along the straight wall.

After the lower portion of the resin pipe whose shape has been restored is fixed to the joint, the space between the manhole straight wall and the resin pipe is filled with a filler and hardened, and the manhole straight wall is filled with the filler and the resin pipe. cover.

[0012]

1 is a perspective view showing an embodiment of the present invention. In the figure, reference numeral 1 is a flat resin pipe set up in a manhole 2. The flat resin pipe 1 is made of a thermoplastic resin such as vinyl chloride, polyethylene, polypropylene, or polybutene. As shown in the perspective view of FIG. 2, the thermoplastic resin is extruded so that the outer diameter D is slightly smaller than the inner diameter of the straight wall 3 of the existing manhole 2,
For example, the straight wall 3 of the manhole 2 is molded into a cylindrical resin pipe 1a having an outer diameter smaller than the inner diameter of the straight wall 3 by about 60 mm.
Cut to the same length as the depth of. When the resin pipe 1a is formed at a temperature higher than the shape recovery temperature and lower than the shape memory temperature, for example, when the resin pipe 1a is made of hard vinyl chloride,
While softening in a heating atmosphere of 90 to 120 degrees,
It is flattened as shown in FIG. 3 by a mechanical method such as lapping and extrusion slits. This flat resin pipe 1 is shown in FIG.
As shown in (a) and (b), the ends are rounded so that they come close to each other, or folded as shown in FIG. 4 (c), and the cross-sectional area is made large enough to be inserted from the mouth ring 4 of the manhole 1. Make it smaller and cool to fix the shape.

Manufactured by using this flat resin pipe 1.
When rehabilitating the hull 2, the flat resin pipe 1 with a reduced cross-sectional area is brought to the site, suspended using a lift or the like, and inserted into the manhole 2 as shown in FIG. It is temporarily installed on the invert 5 of the rule 2. After that, a packer 8 made of flexible rubber and having a fluid passage in the central portion is inserted into the upstream pipe outlet 6 and the downstream pipe outlet 7 connected to the manhole 2, and the fluid in the central portion is inserted. The channel is expanded in a sealed state so that the pipe ports 6 and 7 are sealed. In this state, as shown in FIG. 5, the heating fluid generator 9 is installed near the manhole 2. A heating fluid having a temperature higher than the shape recovery temperature of the flat resin pipe 1 and lower than the shape memory temperature is supplied to the inner and outer surfaces of the flat resin pipe 1 from the heating fluid generator 9 via the supply hoses 10 and 11. . The shape of the flat resin pipe 1 begins to recover to the original cylindrical resin pipe 1a due to the temperature of the heating fluid being supplied.

The shape recovery of the flat resin pipe 1 progresses,
When the outer surface of the cylindrical resin pipe 1a expands while contacting the step 12 of the manhole 2, the supply of the heating fluid is temporarily stopped, and as shown in FIG. 6, each step 12 of the resin pipe 1a is stopped. The part 13 corresponding to is cut and removed from the inside like a box. In addition, each step 1
The portion 13 corresponding to 2 may be cut and removed in advance before flattening the resin pipe 1a. At this time, if there is a step 12 that is significantly corroded by sulfurous acid gas or the like, the step 12 is removed from the root.

In this way, the box-out portion 13 of step 12
After removing the, the supply of the heating fluid is started again, and the shape is restored to the original shape of the molded resin pipe 1a to form the cylindrical shape. If the cross section of the resin pipe 1a does not become a perfect circle when the shape of the resin pipe 1a is restored, an auxiliary bag of rubber or synthetic resin is inserted, and heated and pressurized steam of, for example, about 0.5 Kgf / cm ² is inserted therein. It may be supplied or a cross section may be made into a perfect circle by using a jack while softening the resin pipe 1a.

When the shape of the resin pipe 1a is restored to the formed cylindrical shape, the resin pipes 1a of the upper and lower pipe outlets 6 and 7 are formed.
Is cut and removed by a radius corresponding to the pipe diameter as shown in FIG. If this portion is cut and removed before the resin pipe 1a is processed into the flat resin pipe 1, the on-site construction can be further simplified.

After that, the end of the resin pipe 1a and the invertor are
The contact portion 14 with the belt 5 is jointed with an adhesive such as an epoxy resin. Also, in order to prevent the mortar from leaking from the upper and lower pipe outlets 6 and 7 using the packer 8,
The surface of is contacted with both the straight wall 3 of the manhole and the resin pipe 1a. Further, a box or pipe having a shape corresponding to the box-removed portion 13 in step 12 is inserted so as to hit the manhole straight wall 3, and the joint is fixed with an adhesive such as an epoxy resin.

After the jointing work is completed, as shown in FIG. 7, the sealed fluid passage in the central portion of the packer 8 is opened, and sewage is caused to flow through this fluid passage. In this state, a hole is made in the lower part of the resin pipe 1a, and the threaded joint 1 with valve is attached.
Join 5 Then, the filling pump 16 is installed in the vicinity of the manhole 2, and the filling pump 16 and the valve-equipped screw-in joint 15 are connected by a grout hose 17. Thereafter, a filling pump 16 is fed through a grout hose 17 with a filler 18 made of an inorganic mortar such as a cement mortar, an epoxy mortar or an organic resin mortar, and the manhole 2
And the resin pipe 1a. This filler 18
When filling the gap between the manhole 2 and the resin pipe 1a, the air is slowly pumped in so that there is no air entrapment,
Filling agent 18 is filled to the extent that it slightly overflows from the upper end of resin pipe 1a. A vibrating machine such as a vibrator may be used to facilitate the flow of the filler 18 and prevent the entrainment of air.

The filler 18 is used as the manhole 2 and the resin pipe 1.
After filling the entire gap with a, the pressure feed from the filling pump 16 is stopped, the valve of the valve-equipped screw-in joint 15 is closed, and the filling agent 18 is waited to cure.

When the filler 18 is hardened and dried, the threaded joint with valve 15, the packer 8 and the material for removing the box from step 12 are removed, and putty or the like is filled into the box to be removed at step 12 to make the surface smooth. . When step 12 is removed from the root, a hole is made in the filler 18 and the manhole direct side 3 at that portion by a drill or the like, a new step 12 is inserted, and an adhesive is filled and fixed. In this manner, the entire surface of the straight wall 3 of the manhole 2 is doubly covered with the filler 18 and the resin pipe 1a having chemical resistance to acids and alkalis such as sulfuric acid and hydrochloric acid. And it can improve anticorrosion.

When the processing of the straight wall 3 of the manhole 2 is completed, the processing of the slanted wall 19 of the manhole 2 is performed. This slanted wall 1
Since No. 9 is close to the ground surface and the area is small, there is little infiltration water. Therefore, it is only necessary to take appropriate anticorrosion measures using sulfurous acid gas or the like. The surface of the sloping wall 19 is roughened with a disk sander, and troweled or hand-painted with an epoxy resin putty to a thickness of 3 mm or more.

In the above embodiment, the case where only the filler 18 is filled in the gap between the manhole 2 and the resin pipe 1a has been described. However, the wire mesh is entirely or in the gap between the manhole 2 and the resin pipe 1a. The strength can be reinforced by partially stretching the cloth at equal intervals.

Further, as the resin pipe 1a, as shown in the perspective view of FIG. 8, the resin pipe 1 having a convex rib on the outer peripheral surface is attached.
9A and 9B, as shown in the sectional views of FIGS. 9A and 9B, by using a resin pipe 1a having a key-shaped rib on the outer peripheral surface or a resin pipe 1a having irregularities on the outer peripheral surface, The joining force between 1a and the filler 18 can be further increased.

In the above embodiment, the packer 8 is used to seal the upper / downstream pipe outlets 6 and 7 and the filler 18 is prevented from leaking. A temporary pipe corresponding to the pipe diameter may be connected between 6 and 7.
In this case, the work can be performed without stopping the flow of sewage even when the flat resin pipe 1 is set up in the manhole 2.

[0025]

As described above, according to the present invention, a thermoplastic resin pipe having an outer diameter slightly smaller than the inner diameter of the straight wall of the manhole is heated and softened at a temperature not lower than the shape recovery temperature and not higher than the shape memory temperature to be flattened. After processing into a flat shape, the flat resin pipe is rolled or folded so that both ends come close to each other to reduce the cross-sectional area, and a resin pipe with an outer diameter larger than that of the muzzle of the manhole is inserted from the muzzle of the manhole. With this configuration, a resin pipe having an outer diameter larger than that of the manhole of the manhole can be easily inserted into the manhole.

After the resin pipe having a reduced cross-sectional area is set up inside the manhole, the upper and lower pipes of the manhole are sealed or communicated with each other, and then the resin pipe in the manhole is closed. By simultaneously heating the outer surface at a temperature not lower than the shape recovery temperature and not higher than the shape memory temperature, the resin pipe is uniformly heated and the shape is restored to a cylinder, so the resin pipe can be placed along the straight wall of the manhole in a short time. Can be erected.

After sealing the lower portion of the resin pipe whose shape has been restored, the space between the straight wall of the manhole and the resin pipe is filled with a filler made of cement type or inorganic type mortar or organic type resin mortar and hardened. Then, the straight wall of the manhole is covered with a filler and a homogeneous resin pipe without a pinhole manufactured at the factory, so that the water resistance and the corrosion resistance of the straight wall of the manhole can be enhanced.

Further, since the resin pipe and the filler are integrated and the thickness of the filler can be increased, the man
It is also possible to reinforce the strength of the rubber itself.

Further, in the case of a sewer pipe, since the construction can be performed while flowing the sewer, the manhole can be rehabilitated without impairing the original function of the sewer pipe.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a resin pipe.

FIG. 3 is a cross-sectional view showing a flat resin pipe.

4 (a), (b) and (c) are cross-sectional views showing flat resin pipes each having a small cross-sectional area.

FIG. 5 is a cross-sectional view showing a shape recovery process of the flat resin pipe.

FIG. 6 is a perspective view showing a processing step of a resin pipe.

FIG. 7 is a cross-sectional view showing a step of filling a filler.

FIG. 8 is a perspective view showing another example of a resin pipe.

9A and 9B are cross-sectional views showing other examples of resin pipes.

[Explanation of symbols]

 1 Flat Resin Pipe 1a Resin Pipe 2 Manhole 3 Straight Wall of Manhole 4 Manhole Mouth 8 Packer 9 Heating Fluid Generator 16 Filling Pump 18 Filler

Claims (1)

[Claims] 1. A thermoplastic resin pipe having an outer diameter slightly smaller than the inner diameter of a straight wall of a manhole is heated and softened to be processed into a flat shape, and then the shape is changed so as to reduce the cross-sectional area.
The resin pipe is erected inside the manhole, the upper and lower pipes of the manhole are sealed or communicated with each other, and the inside and outside surfaces of the resin pipe in the manhole are above the shape recovery temperature and below the shape memory temperature. The heating fluid is supplied to restore the shape of the resin pipe to a cylinder, the lower portion of the resin pipe whose shape has been restored is fixed to the joint, and the cement-based mortar, inorganic mortar or organic resin is placed in the space between the wall of the manhole and the resin pipe Manufactured by filling and hardening a filler made of a system resin mortar
Rehabilitation method of le.