JPH0823173B2 - Method of repairing existing human hole 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 sewers.

[0002]

2. Description of the Related Art Conventionally, the existing manholes (so-called manholes) in sewers, especially the bottom part, expand due to corrosion due to the passage of a long time, external pressure from the surroundings, or reaction between hydrogen sulfide in the fluid and the alkali component of the concrete. In many cases, cracks and damages occur due to the organic compound.

[0003] When these cracks and damage occur,
Due to the infiltration of groundwater, etc., especially in rainy weather, the amount of sewage that exceeds the treatment capacity of the sewage treatment plant may flow in. However, for example, a manhole in the basement of an intersection with a lot of traffic will replace itself,
Since part of the road had to be closed for a long period of time and traffic congestion occurred, construction was difficult in practice.

Therefore, for repairing the existing human hole, a thermoplastic resin plate has recently been formed into a shape that reproduces the surface shape of the bottom of the existing human hole, and the bottom surface is hermetically covered by these repair members. It was done by things.

That is, for example, as shown in FIG. 6, the bottom portion (21a) of the existing human hole (21) is composed of two substantially semicircular flat portions (22) and a groove-shaped curved surface portion (23). The diameter of the opening of the human hole (21) is smaller than the inner diameter of the bottom (21a).

Accordingly, in order to repair the bottom (21a) of the existing human hole (21) which has been damaged after a long period of time, this bottom (21a)
After finishing the surface by surface cutting or mortar coating, etc., a repair member (25) (26) divided into several semicircular or groove-shaped pieces is manufactured by cutting or molding from a thermoplastic resin flat plate, and these After inserting the repair members (25) (26) of (1) into the existing human hole (21) and covering the bottom portion (21a) of the human hole (21) with the repair members (25) (26), these members (25) ) (26) was welded and the anchor (27) was hammered into the flat part to fix the repair members (25) and (26) to the bottom (21a).

[0007]

However, in general, the bottom of the existing human hole does not have a standardized constant surface shape and size, and as a result of repeated repairs with mortar, etc. The surface shape is different for each, so it is necessary to manufacture the repair member made of thermoplastic resin according to the surface shape and divide it into several pieces at each site, which is required for the repair work. There is a problem that as the time becomes longer, the period for pumping the fluid on the upstream side of the repair man hole becomes longer and the cost becomes higher.

In addition, groundwater often flows continuously to the existing manhole to be repaired. Therefore, if the invert part (the reverse arch part at the bottom of the sewer) is cut, a larger amount of water will be added. However, there was a problem that the work of stopping the water at the outlet of the groundwater was very troublesome.

Conventionally, a bottomed cylindrical lining material made of synthetic resin is used, the lining material is folded into a small size and inserted into an existing human hole, and then heating steam is introduced into the lining material to form a lining material. To the bottomed cylinder,
Although a method of repairing the existing human hole by cooling and solidifying is also implemented, the bottom wall of the lining material can be formed into an inclined shape with many irregularities of the existing human hole only by restoring the lining material by such heating steam. There was a problem that it was difficult to strictly follow the upper surface of the bottom part of the and the groove for drainage.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to make the bottom wall of the lining material strictly follow the upper surface of the inclined bottom portion having many irregularities of the existing human hole and the drainage groove. Therefore, even if the existing human hole can be reliably repaired, and even if the surface shape of the bottom of the existing human hole differs from site to site, there is very little on-site work and quick repair work is possible. In addition, the repair cost is low, and the repair work can be speeded up so that water can be passed quickly after the repair work, thus minimizing traffic congestion even at intersections with heavy traffic, for example. , There is an attempt to provide a method of repairing an existing human hole in sewers, which can carry out the repair work of the existing human hole.

[0011]

In order to achieve the above-mentioned object, the present invention has a bottom made of synthetic resin, which has a shape covering an inner wall of an existing human hole in sewer and has a bottom wall and an upper wall. A cylindrical lining material is prepared, and a steam inlet and an air outlet etc. are opened on the upper wall of this lining material.
The first step is to fold the lining material into a small hole and insert it into the existing human hole from the upper end opening, and then introduce the heating steam into the lining material from the steam inlet to make the lining material a bottomed tubular shape. After recovering to, the second step of cooling and solidifying, and cutting and removing the upper wall of the lining material,
A third step of inserting a heater into this lining material and reheating the bottom wall of the lining material to soften it, and removing the heater and pressing the softened lining material bottom wall from above, the bottom wall of the existing person The fourth step of deforming along the upper surface of the bottom of the hole and the drainage groove, and forming through holes on both sides of the lower end of the peripheral wall of the lining material that lead to the water holes at both ends of the groove of the existing human hole, and the lining. After the material is cooled and solidified,
A fifth step of fixing the lining material to the bottom of the existing human hole and the inner surface of the peripheral wall by pouring a filler made of polymer cement paste or the like into the gap between the peripheral wall of the existing human hole and the peripheral wall of the lining material to cure the filler. The main point is to repair existing holes in the sewer system.

In the method of repairing an existing human hole, when the bottomed cylindrical lining material is inserted into the existing human hole,
This is folded into a small piece. At this time, the lining material is, for example, pressurized steam of 1.0 to 1.2 kgf / cm ² to about 90
The lining material must be foldable in that temperature range in order to be softened and folded by heating to ~ 105 ° C. Also, after inserting, pressurized steam is introduced into the lining material, and the pressure is 1.0 to 1.5 kgf / cm ² , and
By heating and pressurizing the lining material to a temperature of 00 to 110 ° C,
When restored, the lining material needs to be restored to a state close to the original shape with a circular cross section. In addition, since the lining material is injected with the polymer cement paste on the back surface of the lining material, the lining material needs to have a strength capable of withstanding the load of these fillers, and between the peripheral wall of the existing human hole and the peripheral wall of the lining material. Should be uniformly filled with polymer cement paste.

From the above, linear low-density polyethylene (so-called linear polyethylene) is used as the synthetic resin constituting the bottomed tubular lining material, and is 0.9
It is preferable to use those having an average density of 15 to 0.935 g / cm ³ .

If the average density of the linear low-density polyethylene is less than 0.915 g / cm ³ , the rigidity of the linear low-density polyethylene is insufficient to withstand the load of the filler injected to the back surface.
It is not preferable because it causes deformation. Further, when the average density exceeds 0.935 g / cm ³ , it becomes difficult to soften, so folding and restoration by steam are impossible, and even if folding is possible by forced folding, insertion is possible. After the restoration by heated steam,
Since it is impossible to restore the extremely bent part, it does not return to the original shape with a circular cross section, and its shape collapses,
As a result, the filling amount of the filler made of polymer cement, paste or the like injected on the back surface of the lining material varies, which is not preferable.

Further, it is desirable to use the lining material which is integrally formed by, for example, rotational molding and has no welded portion. Such a lining material having no welded portion has excellent practical strength and watertightness.

Incidentally, as the synthetic resin constituting the above-mentioned lining material, polyvinyl chloride, a high density polyethylene having a side chain, polypropylene and the like as other general underground constituent materials can be considered. As the material, it is desirable to use a material which is integrally formed by, for example, rotational molding and has no welded portion, and for this purpose, it is necessary to use a resin having a low melt viscosity as a raw material.

For example, in the case of polyvinyl chloride, it is necessary to add a plasticizer in an amount of 40% by weight or more in order to reduce the melt viscosity of the resin. However, such a low-melt viscosity polyvinyl chloride lining material lacks rigidity and cannot withstand the load of the filler such as polymer cement or paste injected on the back surface, causing deformation. Appropriate.
Further, polypropylene lining material has a high softening temperature, so it cannot be folded or restored by steam, and in the case of a high-density polyethylene lining material having a side chain, due to insufficient rigidity, After all, it will not be able to bear the load of the filler such as polymer cement and paste injected on the back side, and it will deform, so
Not preferred.

Therefore, it is most preferable to use the linear low-density polyethylene as described above as the synthetic resin constituting the lining material.

As the heater for covering the surface of the bottom of the existing human hole, a planar heater having flexibility itself is used. As such a sheet heater, for example, a sheet heating element is embedded in silicon rubber, and the surface of the heater is heated up to about 200 ° C. by energizing the terminals of the sheet heating element. Use something warm.

In the fourth step of the method for repairing an existing human hole, after forming through holes which communicate with the water holes of the existing human hole on both sides of the lower end of the peripheral wall of the lining material in the cooled and solidified state,
In the fifth step, when pouring a filler made of polymer cement paste or the like into the gap between the peripheral wall of the existing human hole and the peripheral wall of the lining material, the water holes of the existing human hole and the through holes of the lining material are In advance, filled with a filling material such as foamed polystyrene, after curing the filler, remove this filling material, the communication hole leading to the water hole of the existing human hole and the through hole of the lining material, after curing It is desirable to form it in the filler layer.

[0021]

According to the method for repairing the existing human hole in the sewer, the bottomed tubular lining material is folded into a small size and inserted into the existing human hole, and then the lining material is heated by steam in the existing human hole, Restore this to a bottomed cylinder,
Once cooled and solidified, then the upper wall of the lining material is cut and removed, a heater is placed in the lining material, the bottom wall of the lining material is reheated to be softened, and the softened lining material bottom wall is forced from above. The bottom wall of the existing human hole and the groove for drainage, so that the bottom wall of the lining material is closely aligned with the upper surface of the existing human hole and the groove. Can be made
The existing human hole can be reliably repaired. Further, even when the surface shape of the bottom of the existing manhole is different for each site, the site work can be extremely small and the repair work can be speeded up.

[0022]

Embodiments of the present invention will now be described with reference to the drawings.

1 to 5 show an embodiment of the present invention in the order of steps.

First step The existing human hole (1) in the sewer is, for example, the upper opening (1b).
Has a diameter of 600 mm and the bottom (1a) has a diameter of 900 mm
The size of the bottom portion (1a) is larger than that of the opening portion (1b). A drainage groove (2) is provided in the center of the upper surface of the bottom (1a) of the existing human hole (1), and the upper surface of the bottom (1a) is inclined so that it gradually lowers toward this groove (2). Water holes (3) (3) are formed in the lower end of the peripheral wall (1c) of the existing human hole (1) at positions corresponding to both ends of the groove (2).

Then, according to the size of the inner wall of the existing human hole (1), the bottomed cylindrical lining material (11) made of synthetic resin is used.
Was prepared in advance by rotational molding and prepared.

As the synthetic resin constituting the lining material (11), a linear low density polyethylene having a thickness of about 6 mm and having an average density of 0.925 g / cm ³ was used. . Lining material (11) consists of bottom wall (12) and top wall
(13) and has a steam inlet (15) on its upper wall (13)
And the air discharge port (16) are opened.

First, the lining material (11) is 1.0 to
The lining material (11) is about 500 mmφ so that it is softened by heating with pressurized steam of 1.2 kgf / cm ² to about 90 to 105 ° C. and becomes smaller than the upper end opening (1b) of the existing human hole (1). Fold it up to the size of the
Inserted from b) (see Figure 1).

Second step Next, pressurized steam is introduced into the lining material (11) through the steam introduction port (15) and pressurized at a pressure of 1.3 kgf / cm ² to give 100 to 110 to the lining material (11). It was heated to ℃ and restored to a bottomed cylindrical shape. Subsequently, the heating steam was switched to compressed air, and the lining material (11) was cooled and solidified (see FIG. 2).

Third step Further, after cutting and removing the upper wall (13) of the lining material (11),
Inside the lining material (11), a heater (4) covering the surface of the bottom (1a) of the lining material (11) was placed (see FIG. 3). Here, as the heater (4), for example, a planar heater in which a planar heating element is embedded in silicon rubber and which has flexibility itself is used. By energizing the terminals of the sheet heating element, the surface of the heater (4) was heated to about 200 ° C., and the bottom wall (12) of the lining material (11) was reheated to be softened.

Fourth Step The heater (4) is removed, and the softened lining material bottom wall (1
2) Press from above to attach the bottom wall (12) to the bottom of the existing human hole (1).
(1a) Deform along the upper surface and along the drainage groove (2), and on both sides of the lower end of the peripheral wall (14) of the lining material (11), attach the groove (2) at both ends of the existing human hole (1). The through holes (17) and (17) leading to the water holes (3) and (3) were opened (see FIG. 4).

Fifth Step After cooling and solidifying the lining material (11), the peripheral wall (1) of the existing human hole (1) is
In the gap between c) and the peripheral wall (14) of the lining material (11), an emulsion type polymer cement with a specific gravity of 1.8 g / cm ³
Filler consisting of paste (so-called cement milk) (1
8) was poured and cured, and the lining material (11) was fixed to the bottom portion (1a) of the existing human hole (1) and the inner surface of the peripheral wall (1c) (see FIG. 5).

At this time, the water hole (3) of the existing human hole (1)
(3) and the through holes (17) and (17) of the lining material (11) are filled with a filling material such as expanded polystyrene in advance so as to extend over both holes (3) and (17). . Then, the filler (1
By curing 8), the lining material (11) is fixed to the bottom (1a) of the existing human hole (1) and the inner surface of the peripheral wall (1c), and the filling made of expanded polystyrene is removed, and after curing In the filler (18) layer of, the communication holes (not shown) that communicate with the water holes (3) (3) of the existing human hole (1) and the through holes (17) (17) of the lining material (11) are provided. Formed.

[0033]

As described above, the present invention provides a bottomed cylindrical lining material made of synthetic resin having a shape for covering the inner wall of an existing human hole in the sewer and having a bottom wall and an upper wall,
The upper wall of this lining material is provided with a steam inlet and an outlet for air and the like. The lining material is folded into a small size and inserted into the existing human hole from the upper end opening thereof.
Step, then introducing steam from the steam inlet to the inside of the lining material to restore the lining material to a bottomed tubular shape, then the second step of cooling and solidifying, and cutting and removing the upper wall of the lining material, A third step of inserting a heater into this lining material and reheating the bottom wall of the lining material to soften it, and removing the heater and pressing the softened lining material bottom wall from above, the bottom wall of the existing person While deforming along the upper surface of the bottom of the hole and the groove for drainage,
On both sides of the lower end of the peripheral wall of the lining material, a fourth step of forming through holes communicating with the water passage holes at both ends of the concave groove of the existing human hole, and after cooling and solidifying the lining material, the peripheral wall of the existing human hole and the peripheral wall of the lining material The method comprises the fifth step of injecting a filler made of polymer cement, paste or the like into the gap between them to cure the same and fixing the lining material to the bottom of the existing human hole and the inner surface of the peripheral wall. For example, the bottom wall of the lining material can be aligned with the upper surface of the inclined bottom portion having a large number of irregularities of the existing human hole and the concave groove, and the existing human hole can be reliably repaired. Moreover, even if the surface shape of the bottom of the existing human hole differs from site to site, the work on the site is extremely small, and the repair work can be speeded up, the repair cost is low, and the repair work is speeded up. This allows water to be passed through after repairs at an early stage.
Therefore, for example, even at an intersection with a large amount of traffic, there is an effect that the traffic congestion can be minimized and the repair work of the existing human hole can be performed.

Further, according to the method of the present invention, it is possible to fold and restore by steam, and it is possible to sufficiently withstand the load of the filler such as polymer cement paste injected on the back surface and to deform it. By using the bottomed cylindrical lining material, the work on site is extremely small, the existing human hole can be repaired very easily and reliably, and the repair cost is low.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a small-folded synthetic resin lining material is inserted inside an existing human hole in the first step of the present invention.

FIG. 2 is a cross-sectional view showing a state in which heating steam is introduced into the lining material to restore the lining material to a bottomed tubular shape in the second step of the present invention.

FIG. 3 is a cross-sectional view showing a state in which a heater is placed in the lining material to reheat the bottom wall of the lining material in the third step of the present invention.

[FIG. 4] In a fourth step of the present invention, the softened lining material bottom wall is deformed along the upper surface of the bottom of the existing human hole and the groove for drainage, and on both sides of the lower end of the peripheral wall of the lining material. It is sectional drawing which shows the state which opened the through-hole which leads to the water passage of an existing human hole.

FIG. 5 is a cross-sectional view of an existing manhole after being repaired by the method of the present invention.

FIG. 6 is a partial perspective view showing a state in which repair members of various shapes are inserted from the opening of an existing human hole by a conventional method.

[Explanation of symbols]

1 Existing human hole 1a Bottom part 1b Opening part 1c Circumferential wall 2 Drainage groove 3 Water passage hole 4 Planar heater 11 Bottomed cylindrical lining material 12 Bottom wall 13 Top wall 14 Circumferential wall 15 Steam introduction port 16 Air discharge port 17 Penetration Pore 18 Filler made of polymer cement, paste, etc.

Claims (2)

[Claims] 1. A bottomed cylindrical lining material (11) made of synthetic resin, which has a shape covering an inner wall of an existing human hole (1) in sewerage and has a bottom wall (12) and a top wall (13). A steam inlet (15) and an air outlet (16) have been opened in the upper wall (13) of this lining material (11). (1) Place the top opening (1
The first step of inserting from b), and then the steam inlet (15)
The second step of introducing heating steam into the lining material (11) to restore the lining material (11) to a bottomed tubular shape and then cooling and solidifying it, and the upper wall (13) of the lining material (11) The heater (4) is removed by cutting and removing the lining material (11) and inserting the heater (4) in the lining material (11) to reheat and soften the bottom wall (12) of the lining material (11). , Press the softened lining material bottom wall (12) from above and deform the bottom wall (12) along the upper surface of the bottom (1a) of the existing human hole (1) and the drainage groove (2). At the same time, on both sides of the lower end of the peripheral wall (14) of the lining material (11), the through holes (17) (17) (17) (17) that communicate with the recessed grooves (2) of the existing human hole (1) and the water holes (3) (3) at both ends. ), And after cooling and solidifying the lining material (11), polymer cement paste is placed in the gap between the peripheral wall (1c) of the existing human hole (1) and the peripheral wall (14) of the lining material (11). Pour the filler (18) consisting of Curing allowed, the more the fifth step of fixing the inner surface of the bottom portion of the existing man hole lining material of (11) (1) (1a) and the peripheral wall (1c), method of repairing existing man hole in the sewer. 2. A straight-chain low-density polyethylene as the synthetic resin constituting the bottomed cylindrical lining material (11),
A method of repairing an existing human hole in a sewer, comprising using a material having an average density of 0.915 to 0.935 g / cm ³ .