JP3174866B2 - Repair method of existing manhole in sewer - 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 repairing an existing human hole in a sewer.

[0002]

2. Description of the Related Art Conventionally, the bottom of existing manholes (so-called manholes) in a sewer system has been expanded due to corrosion over a long period of time, external pressure from the surroundings, or reaction between hydrogen sulfide in a fluid and alkali components of concrete. In many cases, cracks or damages are caused by the toxic compounds.

[0003] When these cracks and damage occur,
Due to infiltration of groundwater or the like, there is a possibility that the amount of sewage exceeding the treatment capacity of the sewage treatment plant flows in, especially in rainy weather.

[0004] However, for example, a human hole provided underground in an intersection with a large traffic volume needs to close a part of the road for a long period of time when replacing itself, which causes traffic congestion. Above, construction was difficult.

[0005] Therefore, using a bag-shaped lining material made of synthetic resin, the lining material is folded small, inserted into an existing human hole, and then heated steam is introduced into the lining material to obtain a lining material. A method of restoring to a bottom cylindrical shape, cooling and solidifying, and repairing an existing human hole has been implemented.

[0006]

However, the lining material restored by the conventional heating steam has a bag-like shape,
Because it is relatively thin, the strength is not sufficiently large, and in general, existing manholes to be repaired often have groundwater flowing continuously,
In such existing manholes, repairing with only a thin bag-like lining material is not sufficient, and in addition, the bottom wall of the bag-like lining material has an inclined bottom top surface having a large number of unevenness of the existing manhole. It is difficult to strictly follow the drainage groove, and there is a problem that the existing manhole cannot be completely repaired.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to form a very strong repair inner wall on the inner surface of an existing human hole using a thick synthetic resin lining material. As well as at the bottom of the existing human hole,
It is possible to form a repair bottom wall strictly along the inclined upper surface having a large number of irregularities on the bottom and the drainage groove, so that the existing manhole can be reliably repaired and the repair work is speeded up. The repair cost can be reduced, and the repair work can be speeded up and the water flow after repair can be performed earlier, so that, for example, at an intersection with heavy traffic, traffic congestion can be minimized. It is an object of the present invention to provide a method for repairing existing manholes in sewers, which can perform repair work for existing manholes.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a length to cover an inner peripheral wall of an existing manhole in a sewer and is smaller than an inner diameter of an upper end opening of the existing manhole. A first step of inserting a cylindrical lining material made of a synthetic resin having an outer diameter and having a number of rod-shaped heater insertion holes in its peripheral wall in the length direction into an existing human hole from an upper end opening thereof; A second step of inserting a rod-shaped heater from above into each rod-shaped heater insertion hole of the peripheral wall of the shaped lining material, heating the cylindrical lining material with the heater, and heating and softening the cylindrical lining material; After a lining material enlarging bag having a size to cover the inner peripheral wall of the existing human hole is inserted into the lining material by folding it smaller than the upper end opening of the cylindrical lining material, a pressure fluid is introduced into the bag. And inflate the bag A third step of deforming the cylindrical lining material in the heated and softened state along the inner peripheral wall of the existing human hole, cooling and solidifying the deformed lining material, and then discharging the pressure fluid from the bag to shrink the bag. The fourth step of removing the bag from the deformed lining material, and covering the bottom upper surface of the existing human hole with a synthetic resin bottom lining sheet and joining the peripheral edge of the sheet to the lower end of the peripheral wall of the deformed lining material The gist is a method for repairing existing manholes in the sewerage system, which comprises a fifth step.

In the first step of the method for repairing an existing manhole, the cylindrical lining material made of synthetic resin has a length to cover the inner peripheral wall of the existing manhole and an inner diameter of an upper end opening of the existing manhole. It has a smaller outer diameter and has a number of bar-shaped heater insertion holes formed in the lengthwise direction on its own peripheral wall.

Generally, the existing manhole in the sewage system has, for example, a diameter of 600 mm at the top opening and a diameter of 9 mm at the bottom.
At 00 mm, the size of the bottom is larger than the opening. Also,
The depth of the existing manhole is, for example, the height from the upper end opening to the tapered shoulder is 600 mm, the height of the cylindrical inner peripheral wall below this is 600 mm, and the following depends on the installation location of the existing manhole. In this case, one or several cylindrical inner peripheral walls having a height of 600 mm and a depth of the human hole are stacked.

Therefore, it is preferable that the length of the synthetic resin-made cylindrical lining material is, for example, about 300 mm longer than the depth of the existing human hole so as to cover the inner peripheral wall of the existing human hole after the deformation. The tubular lining material may be used by cutting it into appropriate lengths according to the situation of the repair site of the existing manhole.

The bottom of the existing human hole is formed of a concrete wall, a drain groove is provided at the center of the upper surface of the bottom, and a drain hole connected to the groove is formed at the lower end of the inner peripheral wall. I have.

The synthetic resin constituting the cylindrical lining material is, for example, hard polyvinyl chloride or linear low-density polyethylene.
It is preferable to use one having a thickness (wall thickness) of mm.

Here, if the thickness of the synthetic resin tubular lining material is less than 10 mm, the rigidity is insufficient, and after repairing the existing manhole, it cannot withstand a load such as groundwater from the back surface.
It is not preferable because it causes deformation. On the other hand, if the thickness exceeds 40 mm, it is difficult to heat the rod-shaped heater and it is difficult to soften the rod-shaped heater. Therefore, the cylindrical lining material cannot be deformed along the inner peripheral wall of the existing human hole, which is not preferable.

As the synthetic resin constituting the lining material as described above, it is preferable to use hard polyvinyl chloride from the viewpoint of processability.

The cylindrical lining material is manufactured by, for example, extruding the above synthetic resin. At the same time as the molding, a rod-shaped heater insertion hole is formed in the peripheral wall in the longitudinal direction of the cylindrical lining material. is there. Therefore, the heater insertion holes are opened at the upper and lower ends of the peripheral wall of the cylindrical lining material. Since the number of heaters for heating the cylindrical lining material is not limited, the rod-shaped heater insertion hole is not limited, but usually, a rod-shaped heater insertion hole is formed in the peripheral wall of the cylindrical lining material, for example, 60 to 150 holes. Opening is preferred.

The heater insertion hole is generally circular in cross section, but may be in other shapes such as oval, square, or triangular in cross section. The heater insertion holes are preferably formed on the same circumference as viewed from above.

When a cylindrical lining material made of synthetic resin having a rod-shaped heater insertion hole having a length to cover the inner peripheral wall of the existing human hole is inserted through the upper end opening of the existing human hole, the upper end of the cylindrical lining material is raised. , Usually projecting upward from the top of the human hole,
After the deformation in a third step described later, the inner peripheral wall of the existing human hole is covered.

Next, in a second step, a rod-shaped heater is inserted from above into each rod-shaped heater insertion hole of the peripheral wall of the cylindrical lining material, and the cylindrical lining material is heated by the heater to be heated and softened. . Here, when, for example, hard polyvinyl chloride is used as the synthetic resin constituting the cylindrical lining material, the cylindrical lining material is heated to, for example, 70 to 150 ° C. by a heater, and the cylindrical lining material is heated and softened. Let me know.

The heater is usually rod-shaped, but if the heater insertion hole has a long cross section such as an oval cross section, a strip plate may be used as long as it can be inserted into the heater insertion hole. A heater in the shape of a hairpin or a heater in the form of a hairpin or a loop may be used.

The heating of the cylindrical lining material by the heater is performed when the center inside edge portion of the gap between the adjacent rod-shaped heater insertion holes on the peripheral wall of the cylindrical lining material is, for example, 65 to 90 ° C. Stop and remove all heaters from the heater insertion holes.

In the third step, a lining material enlarging bag having a size to cover the inner peripheral wall of the existing human hole is provided inside the cylindrical lining material which has been heated and softened in the second step.
Insert through the upper end opening of the cylindrical lining material.

Here, the bag for expanding the lining material is as follows.
Specifically, it is preferable to use a tent fabric or other airtight woven fabric. The bag for expanding the lining material is provided with a pressure fluid inlet and a drain outlet when steam or the like is used.

As such a lining material enlarging bag, for example, a bag having a length of 2 m, 3 m, 4 m, or 5 m is prepared, and depending on the internal size of the existing human hole to be repaired, it is necessary to prepare a bag for the site. It suffices if these are appropriately selected and used according to the situation.

When the lining material enlarging bag is inserted into the existing human hole, it is folded small.

After the insertion, pressurized steam is gradually introduced into the inside of the bag for expanding the lining material, and 1.0 to 1.5 kgf /
The lining material enlarging bag is heated and pressurized to a pressure of cm ² and a temperature of 100 to 110 ° C. to expand it, and the cylindrical lining material in the temperature-raised and softened state is deformed along the inner peripheral wall of the existing human hole. In this case, the bag for expanding the lining material needs to be expanded to a state close to the original shape having a circular cross section.

In the fourth step, the lining material, which has been deformed along the inner peripheral wall of the existing human hole, is blown for 30 minutes to one hour, for example, by switching steam in the lining material expansion bag to air. By doing so, it is allowed to cool and solidify, and then the pressurized fluid (compressed air) is discharged from the bag, shrinking the bag,
The bag is taken out from the deformed lining material.

In the fifth step, a synthetic resin bottom lining sheet is placed on the upper surface of the bottom of the existing human hole. In this case, the bottom lining sheet is made to conform to a large number of irregularities on the bottom upper surface of the existing human hole, and strictly conforms to the drain groove. Thereafter, the rising edge of the bottom lining sheet is joined to the lower end of the peripheral wall of the deformed lining material via an adhesive or by a welding method.

In the above, the synthetic resin constituting the bottom lining sheet is semi-rigid polyvinyl chloride,
It is preferable to use a linear low-density polyethylene having a thickness (wall thickness) of, for example, 10 to 30 mm.

Here, if the thickness of the bottom lining sheet is less than 10 mm, the rigidity is insufficient, and after repairing the existing manhole, the sheet cannot withstand the load of groundwater or the like from the back surface, causing deformation. Not preferred. The thickness is 3
If the thickness exceeds 0 mm, heating by a heater is difficult and softening is difficult, so that the lining sheet cannot be deformed along the bottom wall of the existing human hole, which is not preferable.

As the synthetic resin constituting the lining material as described above, it is preferable to use semi-rigid polyvinyl chloride in view of workability such as adhesion or welding.

Here, as the heater for covering the surface of the bottom of the existing human hole, it is preferable to use a sheet heater having flexibility in itself. Such a sheet heater is, for example, one in which a sheet heating element is embedded in silicon rubber, and the surface of the heater rises up to about 200 ° C. by energizing terminals of the sheet heating element. A warming material is used, but of course is not limited to this.

As the adhesive for adhering the bottom lining sheet and the deformable lining material, for example, a so-called solution adhesive, an epoxy-based, urethane-based, and rubber-based adhesive are used.

The bottom lining sheet and the deformed lining material may be joined by a heat welding method.

The rising edge of the bottom lining sheet and the lower end of the peripheral wall of the deformed lining material may be joined via a synthetic resin band-shaped connecting member.

Here, when the tubular lining material, the bottom lining sheet, and the belt-like connecting member are made of, for example, polyvinyl chloride resin, the adhesive for joining them may be tetrahydrofuran alone or tetrahydrofuran. It is preferable to use a solution type adhesive in which a small amount of vinyl chloride resin or a resin such as a copolymer of vinyl chloride and vinyl acetate is dissolved.

As the bottom lining sheet,
In addition, according to the surface shape and size of the bottom of the existing human hole, use a cut sheet of a repair sheet made of uncured UV-curable glass fiber reinforced unsaturated polyester resin. Then, the sheet may be irradiated with ultraviolet rays to cure the glass fiber reinforced unsaturated polyester resin, and a repair wall may be formed on the bottom of the human hole to hermetically seal it.

Such a repair sheet made of an ultraviolet-curable glass fiber reinforced unsaturated polyester resin is disclosed in Japanese Patent Application No. 3-226220 previously proposed by the present applicants.
It is described in detail.

After the repair of the existing manhole, a filler made of polymer cement paste or the like is poured into the inside of many rod-shaped heater insertion holes in the peripheral wall of the deformed lining material.
This is preferable because the rigidity of the repair wall in the human hole is improved.

Further, after the repair, the unnecessary portion of the deformed lining material projecting upward from the upper end of the existing human hole may be cut and removed.

[0041]

According to the method for repairing existing manholes in the sewer, a thick synthetic resin lining material is used,
The peripheral wall is heated by a number of rod-shaped heaters to soften the temperature, and then a lining material enlarging bag is folded and inserted into the cylindrical lining material from the upper end opening thereof, and then a pressure fluid is introduced into the bag. Then, inflate the bag, deform the cylindrical lining material in the heated and softened state along the inner peripheral wall of the existing manhole, and cool and solidify the deformed lining material. A repair inner wall with high strength can be formed.

In this manner, a repair bottom wall strictly along the inclined upper surface having a large number of irregularities and the drainage groove at the bottom can be formed also at the bottom of the existing human hole. Repair can be performed reliably.

In addition, the repair work can be speeded up, the repair cost can be reduced, and the repair work can be speedily performed so that water can be quickly passed after the repair. Therefore, for example, even at an intersection with a large traffic volume, Repair work on existing manholes can be carried out with minimal traffic congestion.

[0044]

Next, an embodiment of the present invention will be described with reference to the drawings.

First Step Referring to FIG. 1, the existing manhole (1) in the sewer has, for example, a diameter of the upper end opening (1b) of 600 mm and a bottom (1c).
Is 900 mm in diameter, and the size of the bottom (1c) is larger than that of the opening (1b). At the center of the upper surface of the bottom (1c) of the existing manhole (1), a drain groove (2) is provided, and the upper surface of the bottom (1c) is inclined so that it gradually lowers toward the groove (2). And existing grooves at positions corresponding to both ends of the groove (2)
Water holes (3) and (3) are formed at the lower end of the peripheral wall (1c) of (1).

Into the existing human hole (1), a cylindrical lining material (10) made of hard polyvinyl chloride resin was inserted from the upper end opening (1b) of the existing human hole (1).

Here, the cylindrical lining material (10) made of a hard polyvinyl chloride resin has a length to cover the inner peripheral wall (1a) of the existing human hole (1) and is formed of the existing human hole (1). Eighty round rod-shaped heater insertion holes (12) having a circular cross section were formed in the peripheral wall (10a) having a diameter of 550 mm smaller than the inner diameter of the upper end opening (1b) and having a thickness of, for example, 30 mm. And manufactured by extrusion molding.

In this embodiment, the cylindrical lining material is used.
(10) The length of the inner peripheral wall (1a) of the existing human hole (1) after its deformation
It was 300 mm longer than the depth of the existing human hole (1) so that it could be covered.

Second Step Next, as shown in FIG. 2, each of the rod-shaped heater insertion holes (12) in the peripheral wall (10a) of the cylindrical lining material (10) made of hard polyvinyl chloride is inserted into the hole (12). ) Is inserted from above into a rod-shaped heater (13) having a length that is almost the same as the length of the cylindrical lining material (10) for 30 minutes to 1 hour by the heater (13) for 70 to 1 hour.
It was heated to 50 ° C. and softened by heating.

The cylindrical lining material (10) is heated by the rod-shaped heater (13) at the center of the gap between the adjacent rod-shaped heater insertion holes (12) and (12) on the peripheral wall (10a). The operation was stopped when the inner edge portion (point A) reached 70 ° C., and all the rod-shaped heaters (13) were removed.

Third Step Next, as shown in FIG. 3, the existing human hole (1) is placed inside the cylindrical lining material (10) which has been heated and softened in the second step.
The lining material enlarging bag (14) having a size to cover the inner peripheral wall (1a) was folded and inserted into the cylindrical lining material (10) so as to be smaller than the upper end opening.

Here, as the lining material enlarging bag (14), specifically, an airtight polyester woven fabric used for a tent is used. The upper wall (14a) of the lining material expansion bag (14) has a steam inlet (16) and a drain water outlet.
(17) is open.

Next, as shown in FIG. 4, pressurized steam was gradually introduced into the inside of the lining material enlarging bag (14) from the steam inlet (16), and the pressure was set to 1.2 kgf / cm ² . Pressurize and heat the bag (14) for expanding the lining material (100) to 100-110 ° C to expand it, and the cylindrical lining material is heated and softened.
(10) was deformed along the inner peripheral wall (1a) of the existing human hole (1). In this case, the lining material expansion bag (14)
Inflated to a state close to the original shape with a circular cross section.

Although not shown, a bag for expanding the lining material
A drain water discharge pipe (17) in the upper wall (14a) of the upper wall (14a) is airtightly inserted with a drain water discharge pipe, and the lower end of the pipe is filled with the expanded lining material expansion bag (14). A valve is interposed in the pipe, which has reached near the bottom wall of the bag and is taken out from the upper wall (14a) of the bag (14).

Therefore, when introducing the above-mentioned pressurized steam,
The valve is closed and the bag (4) is kept closed. After the deformation of the cylindrical lining material (10), opening this valve allows the drain water collected at the bottom of the bag (4) to be drained, or opens the valve slightly during the introduction of pressurized steam. By doing so, the drain water can be discharged while the bag (14) is inflated.

Fourth Step Further, the lining material (11) after being deformed along the inner peripheral wall (1a) of the existing human hole (1) is put into a lining material enlarging bag (14).
The steam introduced into the inside is switched to compressed air and blown for 1 hour to cool and solidify, and then the compressed air is discharged from the bag (14) to shrink the bag (14) and deform the lining material.
The bag (14) was taken out from the inside of (11) (not shown).

Fifth Step Next, the bottom surface (1b) of the existing human hole (1) was covered with a bottom lining sheet (15) made of semi-rigid polyvinyl chloride resin having a thickness of 20 mm. Then, the sheet for bottom lining (15) is heated to 100 ° C. by a sheet heater (not shown) to soften the sheet for bottom lining (15),
Along the many irregularities on the bottom surface (1c) of the existing manhole (1), it also strictly conformed to the drain groove (2).

Further, after cooling the bottom lining sheet (15), the rising edge (15a) of the sheet (15) is coated with a solvent type adhesive at the lower end of the peripheral wall (11a) of the deformed lining material (11). And a belt-like connecting member (18) made of polyvinyl chloride resin is passed between them, and the bottom lining sheet
(15) rising edge (15a) and band-shaped connecting member (18),
In addition, the lower end of the peripheral wall (11a) of the deformed lining material (11) and the belt-shaped connecting member (18) were joined via a solvent-type adhesive.

Finally, a specific gravity of 1.8 g / cm ^{3 is} inserted into all the rod-shaped heater insertion holes (12) of the lining material (11) deformed along the inner peripheral wall (1a) of the existing human hole (1). Of an emulsion-based polymer cement paste (so-called cement milk).

After the repair of the existing manhole (1) as described above, the unnecessary portion of the deformed lining material (11) projecting upward from the upper end opening (1b) of the existing manhole (1) is cut off and repaired. Completed work.

[0061]

The method for repairing an existing human hole according to the present invention is as follows.
As described above, it has a length to cover the inner peripheral wall of the existing human hole, has an outer diameter smaller than the inner diameter of the upper end opening of the existing human hole, and has a number of bar-shaped heater insertion holes formed in the peripheral wall in the length direction. The first step of inserting the synthetic resin tubular lining material into the existing human hole from the upper end opening thereof, and inserting the rod heater from above into each rod heater insertion hole in the peripheral wall of the cylindrical lining material. A second step of inserting the cylindrical lining material by the heater and heating and softening the cylindrical lining material, and a lining having a size enough to cover the inner peripheral wall of the existing human hole inside the cylindrical lining material in the heated and softened state. After inserting the material enlarging bag by folding it smaller than the upper end opening of the cylindrical lining material, introducing a pressure fluid into the bag, inflating the bag,
A third step of deforming the cylindrical lining material in the heated and softened state along the inner peripheral wall of the existing human hole, cooling and solidifying the deformed lining material, and then discharging the pressure fluid from the bag to shrink the bag. The fourth step of removing the bag from the deformed lining material, and covering the bottom upper surface of the existing human hole with a synthetic resin bottom lining sheet and joining the peripheral edge of the sheet to the lower end of the peripheral wall of the deformed lining material According to the method of the present invention, a very strong repair inner wall can be formed on the inner surface of an existing human hole using a thick synthetic resin lining material. At the same time, a repair bottom wall strictly along the inclined upper surface having a large number of irregularities of the bottom and the drainage groove can also be formed at the bottom of the existing manhole, and the existing manhole is reliably repaired. Can do it, and The repair work can be speeded up, the repair cost can be reduced, and the repair work can be speeded up so that water can be drained quickly after the repair, so that traffic congestion can be minimized, for example, at intersections with heavy traffic. The effect is that the repair work of the existing manhole can be performed.

After the repair of the existing manhole, the rigidity of the manhole repair wall is reduced by pouring a filler such as a polymer cement paste into all the rod-shaped heater insertion holes in the peripheral wall of the deformed lining material. There is an advantage of improving.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a synthetic resin cylindrical lining material having a number of rod-shaped heater insertion holes is inserted into an existing human hole in a first step of the present invention.

FIG. 2 is a partially cutaway perspective view showing a state in which a cylindrical heater is inserted into a hole in a peripheral wall of the cylindrical lining material to heat the cylindrical lining material and soften the temperature in a second step of the present invention. It is.

FIG. 3 is a cross-sectional view showing a state in which a lining material enlarging bag is folded and inserted into a cylindrical lining material in a heated and softened state in the first half of the third step of the present invention.

FIG. 4 In the second half of the third step of the present invention, pressurized fluid is introduced into the inside of the lining material enlarging bag to inflate the bag, and the cylindrical lining material in the heated and softened state is along the inner peripheral wall of the existing human hole. FIG. 4 is a cross-sectional view showing a state where the battery is deformed as described above.

FIG. 5 is an enlarged sectional view of the bottom of an existing human hole after repairing by the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing human hole 1a Inner peripheral wall 1b Upper end opening 1c Bottom 2 Drain groove 3 Drainage hole 10 Cylindrical lining material 10a Peripheral wall 11 Deformable lining material 11a Peripheral wall 12 Rod-shaped heater insertion hole 13 Rod-shaped heater 14 Lining material expansion bag 15 Bottom lining sheet 15a Peripheral edge

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E03F 5/02 E03F 7/00 E02D 29/12

Claims (2)

(57) [Claims] An inner peripheral wall (1) of an existing manhole (1) in a sewer.
a) the length of the opening to be covered and the upper end of the existing manhole (1)
The outer wall having an outer diameter smaller than the inner diameter of (1b) and the peripheral wall (10a)
A cylindrical lining material (10) made of synthetic resin with a number of rod-shaped heater insertion holes (12)
The first step is to insert the rod-shaped heater (13) from above into the rod-shaped heater insertion hole (12) in the peripheral wall (10a) of the cylindrical lining material (10). A second step of inserting and heating the tubular lining material (10) by the heater (13) to heat and soften it, and an existing human hole (10) inside the heated and softened tubular lining material (10). A lining material enlarging bag (14) having a size to cover the inner peripheral wall (1a) of (1) is inserted into the bag (14) after being folded smaller than the upper end opening of the cylindrical lining material (10). The pressure fluid is introduced, the bag (14) is inflated, and the cylindrical lining material (10) in the heated and softened state is placed in the existing manhole.
(3) a third step of deforming along the inner peripheral wall (1a) of (1), cooling and solidifying the deformed lining material (11), and then discharging the pressure fluid from the bag (14) to form a bag (14). A fourth step of removing the bag (14) from the deformed lining material (11) and covering the bottom (1c) of the existing human hole (1) with a synthetic resin bottom lining sheet (15). And a fifth step of joining the peripheral edge (15a) of the sheet (15) to the lower end of the peripheral wall (11a) of the deformed lining material (11). 2. A filler made of polymer cement paste is inserted into the rod-shaped heater insertion hole (12) of the lining material (11) deformed along the inner peripheral wall (1a) of the existing human hole (1). The method for repairing an existing human hole according to claim 1, wherein a step of pouring and hardening is carried out.