JP2964141B1 - How to repair sewer inverts - Google Patents

Abstract

[PROBLEMS] To repair a sewer invert easily and reliably in a short time when an opening of an upper block of a sewer manhole is narrow. SOLUTION: A peripheral wall portion 11 and a bottom plate portion 12 of a manhole 1 are provided.
When repairing the invert of the skeleton block 3 having the following, after shaving off the invert portion, the base filler 31 is filled at a predetermined height, and the concrete block 32 is buried in the center thereof. Thereafter, the invert plate 33 having the invert body 34, the inclined plate portion 35, the openings 36a and 36b, and the folded portion 37 is placed on the filler 31 for foundation so that the lower surface of the invert body 34 corresponds to the concrete block 32. A worker moves onto the inverting plate 33 to caulk the periphery of the inverting plate 33, and then injects the filler 38 through the openings 36a and 36b, and fills the lower surface of the inverting plate 33 with the filler to perform repair. Complete.

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 a sewer invert used for a sewer structure such as a manhole having a narrow opening and a drainage basin provided in a drainage facility of a house or the like.

[0002]

2. Description of the Related Art In the case of a prefabricated manhole, for example, in the case of a prefabricated manhole, as described in Japanese Patent Publication No. 6-96875, mortar or ready-mixed concrete is placed on the bottom of a preformed manhole. A base is cast, and an invert joint capable of communicating with the sewage inflow pipe and the outflow pipe is placed on the base in association with both pipes, and after the base is solidified, mortar or ready-mixed concrete surrounds the invert. A method of installing an invert joint in a sewer manhole in which an embedding layer for an invert joint having a conical concave surface is formed by forming a conical concave surface, and the surface of the inversion layer and the invert is covered with a mortar finishing layer is known. ing.

[0003] The sewer manhole formed in this way is damaged by the inflow of earth and sand due to long-term use, the surface of the invert is damaged, and a dimple is formed, and sewage or the like stays in the dimple. There was a risk that the state would be unfavorable in terms of hygiene, and if it was lost, it would lead to contamination of groundwater.

[0004] When the invert is damaged or the bottom is lost as described above, it is conventionally difficult to replace the invert in order to repair the sewer manhole. Cover the surface of the invert with the depression formed in the concrete for foundation,
The surface was covered with a finishing layer of mortar to form an invert.

[0005]

However, in the above-mentioned conventional method of repairing a sewer invert, the entire manhole is replaced, or the surface of the damaged invert is covered with concrete for foundation, and the surface of the mortar is finished. As the invert is formed by covering with layers, the invert will be formed after the foundation concrete has dried, and the repair time will be long, and the worker will enter the sewer manhole and beneath the feet Work,
There is an unsolved problem that the working posture is bad and it takes time to form the invert.

Therefore, the present invention has been made in view of the above-mentioned unsolved problems of the prior art, and can easily repair manholes for sewage, improve work efficiency, and improve durability. It is an object of the present invention to provide a method for repairing a sewer invert that is excellent in terms of efficiency and economy.

[0007]

In order to achieve the above object, a method for repairing a sewer invert according to claim 1 comprises:
A method for repairing a sewer invert in a sewer structure including a sewer manhole having a peripheral wall portion and a bottom plate portion, and an upper block having a narrow opening with respect to the peripheral wall portion, wherein the bottom plate portion has a center. The filler for the foundation reinforced part is constructed, and a flexible invert plate that can be inserted into the opening of the sewer manhole is inserted through the opening on the upper surface of the filler for the foundation, and the center of the inverting plate is inserted. It is placed according to the central part where the flow channel is reinforced, and after caulking around the invert plate, a filler is injected from an opening formed in the invert plate, and the lower surface side of the invert plate is filled with the filler. It is characterized by doing so.

According to the first aspect of the present invention, since the inverting plate has flexibility, the narrowing opening in the upper block can be easily passed without being disassembled by bending the inverting plate, and Can be placed on the filling material, and the central part of the filling material for the foundation is reinforced, and the inverting plate is placed on the reinforcing material. Material injection work can be performed, and these works can be easily performed in a short time.

According to a second aspect of the present invention, there is provided the method for repairing a sewer invert according to the first aspect, wherein the invert plate has a folded portion formed on a peripheral surface thereof which is in contact with a peripheral wall of the sewer manhole. It is characterized by.

According to the second aspect of the present invention, since the folded portion is formed on the peripheral surface of the invert plate, the folded portion is embedded in the filler injected into the lower surface of the invert plate, and the invert plate is filled with the filler. It can be reliably prevented from being peeled off.

Further, in the method for repairing an invert for sewerage according to claim 3, in the invention according to claim 1 or 2, the caulking between the invert plate and the peripheral wall of the manhole for sewerage is performed by using a quick-drying cement for stopping water, synthetic resin or the like. It is characterized by performing using a caulking agent or the like.

According to the third aspect of the present invention, since the invert plate is coked using a quick-drying cement for stopping water, a synthetic resin-based caulking agent, or the like, the connection between the invert plate and the manhole can be ensured in a short time. It can be carried out.

Further, in the method for repairing a sewer invert according to claim 4, in the invention according to any one of claims 1 to 3, the invert plate is formed of a hard synthetic resin material having flexibility. It is characterized by having.

According to the fourth aspect of the present invention, since the inverting plate is formed of a hard synthetic resin material having flexibility, the inverting plate is bent so that it can easily pass through the opening in the narrow upper block. The repair can be performed without dismantling the opening.

According to a fifth aspect of the present invention, the rigid synthetic resin material of the invert plate is made of FRP.

According to the fifth aspect of the present invention, since the flexible hard synthetic resin material of the invert plate is formed of FRP, the strength is high, and the opening is formed in the narrow upper block by bending it. Can be easily passed through, and repair can be performed without dismantling the opening. In addition, durability can be improved.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. First, an assembly type manhole to which the present invention can be applied will be described with reference to FIG. This manhole 1
Sets the bottom plate 12 on a foundation 2 such as chestnut stone laid on the ground from which holes for manholes have been excavated, excluding the cylindrical body block 3, the cylindrical straight wall 4, and the rear wall. 3 An inclined frame 5, a circular frame-shaped height adjusting frame 6, a metal receiving frame 8, and a lid 9 formed on an inclined surface which inclines inward as the side wall goes upward are sequentially stacked from the bottom in this order. It is configured. An upper block is constituted by the straight wall 4 and the inclined frame 5. The manhole 1 is not limited to the illustrated one, and the present invention can be applied to all conventionally known manholes.

The skeleton block 3 is formed of semi-tubular concrete which connects an inflow-side sewage pipe 16 and an outflow-side sewage pipe 14 on a cylindrical peripheral wall portion 11 and a bottom plate portion 12 closing the bottom thereof. An introductory path has been made. Outlet connection port 1
The outflow-side sewer pipe 14 and the inflow-side sewer pipe 16 are provided so that the 5 and the inflow side connection port 17 maintain a certain gradient.

[0019] In such a prefabricated manhole 1, the solid material such as the gravel contained in the sewage flowing down from the inflow side falls onto the invert 18 due to long-term use after the construction, so that the surface of the invert 18 is reduced. As a result, a depression is formed, which hinders a smooth flow of the sewage, and the sewage stays in the depression, giving off a bad smell, resulting in a state unfavorable for hygiene. It also causes groundwater contamination. For this reason, it is necessary to repair the invert 18 of the assembling type manhole 1, and this repair is performed as follows.

First, the sewage flowing into the assembling manhole 1 is sealed off, and at least the bottom of the depression of the old invert 18 is completely removed, and the old invert 18 is shaved to a predetermined depth to form an invert forming space.

Next, as shown in FIG. 2, a filling material 3 for the foundation made of mortar, concrete or pas, which is a semi-mixed product of concrete and mortar, is provided in the invert forming space.
1 is filled to a predetermined height, and a rectangular parallelepiped concrete block 32 for reinforcement is buried in the center.

Next, a new flexible inverting plate 33 having an outer diameter slightly smaller than the inner diameter of the peripheral wall portion 11 of the skeleton block 3 is selected, and the inverting plate 33 is bent so that the inside of the narrow opening of the upper block is formed. And placed on the concrete block 32 of the foundation filling material 31.

Here, the invert plate 33 is formed of a flexible hard synthetic resin material such as glass fiber reinforced plastic (FRP), and as shown in FIGS. A semicircular invert body 34,
An inclined plate portion 35 extending from the peripheral wall of the invert body 34 to the outer peripheral edge is integrally formed.

The inverting plate 33 is not limited to the FRP but various synthetic resin materials can be used. The inverting plate 33 is not limited to the illustrated shape.
The thickness, the shape, and the like can be variously modified, and reinforcing means by ribs, edging, and the like can be appropriately provided.

The invert main body 34 is connected to the outflow connection port 15.
The cross section extended to the inflow side connection port 17 side along the central axis of the outflow connection port 15 so as to coincide with the opening portion is formed in an arc-shaped concave portion, and the center is set from each of the connection ports 15 and 17 respectively. It is formed so as to be tapered with respect to the axis and to have a central portion bulging outward.

Further, the inclined plate portion 35 is
Are formed on a relatively gentle inclined surface whose height gradually increases from the upper edge toward the outer side perpendicular to the central axis, and openings 36a and 36b for filling material are formed on the peripheral edge, respectively. . Further, a folded portion 37 that is bent downward is formed at the peripheral edge of the inclined plate portion 35.

Then, the invert board 33 is positioned and placed on the foundation filler 31 with the lower surface corresponding to the concrete block 32 embedded in the foundation filler 31,
An operator moves onto the upper surface of the invert plate 33 and caulks the space between the folded portion 37 of the invert plate 33 and the peripheral wall portion 11 of the building block 3 opposed thereto with quick-drying concrete or the like so as to move the invert plate 33 to the peripheral wall portion 11. Connect to

Next, the opening 36 of the invert plate 33
a, 36b, a filler 38 usually made of kneaded concrete
Is injected into the space between the invert board 33 and the base filler 31 to fill the space, a vibrator is inserted through the openings 36a and 36b, and vibration is given to the filler 38 to create a gap in the space. Filling without any filler.

At this time, the folded portion 37 at the peripheral edge of the inverting plate 33 is embedded in the surface of the filler 38, and when the filler is dried and solidified,
It is possible to reliably prevent the invert plate 33 from peeling off due to the integration of the filler 3 and the filler 38. Thereafter, the repair of the building block 3 is completed by ironing the details.

As described above, according to the above-described embodiment, since the inverting plate 33 has flexibility, even when the opening of the upper block is narrower than the inner peripheral surface of the body block 3, it can be bent. Since the opening of the upper block can be easily inserted without dismantling, and the central portion of the foundation filler 31 on which the invert plate 33 is placed is reinforced by the concrete block 32, the invert plate 33 The operator can easily transfer to the subsequent caulking operation and the filling material injection operation, and the invert can be reliably repaired in a short time.

In the above embodiment, a description will be given of a case in which, when repairing the invert 18, an invert plate 33 having an outer diameter slightly smaller than the inner diameter of the peripheral wall portion 11 of the skeleton block 3 is selected and repaired. However, the present invention is not limited to this. A plurality of scribe lines are formed on the inclined plate portion 35 of the invert plate 33 by printing or molding on concentric circles, and the peripheral wall portion 11 of the skeleton block 3 to be repaired is formed.
Cut off the outer periphery with a scribe line corresponding to the inside diameter of
There is an advantage that repair of the building block 3 can be performed.

The repairing inverting plate 33 may have various modifications as shown in FIG. That is, as a basic form, as shown in A to G in FIG.
As shown in (b) to (g), they are formed alone or in combination.

Here, FIGS. 4 (b), (c) and (d) show
An example in which the basic types A to G are configured independently, and FIG.
And G, (f) combines basic forms B and G, and (g) combines basic forms A, D, and G. As described above, the inverts shown in (b) to (g) are examples, and by combining one or more of the basic types A to G, it is possible to correspond to all the inflow side sewer pipes.

Further, in the above embodiment, the skeleton block 3
Is described in a cylindrical shape, but in the case of a rectangular tube shape, the outer shape of the inverting plate 33 may be set to a square shape accordingly.

Further, in the above-described embodiment, the case where the present invention is applied to a manhole has been described. However, the present invention is not limited to this. It can also be applied to building structures.

[0036]

As described above, according to the method for repairing a sewer invert according to the first aspect, since the invert plate has flexibility, by bending the invert plate, the narrow width of the upper block can be reduced. The opening can be easily passed through without dismantling, and placed on the foundation filler.In addition, the central part of the foundation filler is reinforced, and the invert plate is placed on this. An operator can transfer to the board to perform the subsequent caulking operation and filler filling operation, and these operations can be easily performed in a short time.

Further, according to the method for repairing the sewer invert according to the second aspect, since the folded portion is formed on the peripheral surface of the invert plate, the folded portion is included in the filler injected into the lower surface of the invert plate. It is possible to reliably prevent the embedded invert plate from being peeled off from the filler.

Further, according to the method for repairing an invert for sewerage according to the third aspect, the invert plate is coked using a quick-drying cement for stopping water, a synthetic resin-based caulking agent, or the like. The connection with the filler for foundation can be reliably performed in a short time.

Further, according to the method for repairing an invert for sewerage according to the fourth aspect, since the invert plate is formed of a hard synthetic resin material having flexibility, the invert plate is bent so that the narrow upper block is formed. Can be easily passed through, and repair can be performed without dismantling the opening.

According to the method for repairing a sewer invert according to claim 5, since the rigid synthetic resin material having flexibility of the invert plate is formed of FRP, the invert plate has high strength and is bent. The opening in the narrow upper block can be easily passed, and repair can be performed without dismantling the opening. Further, the durability can be improved.

According to the present invention, it is possible to easily repair the sewer invert, improve the work efficiency, and obtain a method of repairing the sewer invert which is excellent in durability and economy. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a sewer manhole according to the present invention.

FIG. 2 is an explanatory view showing a method for repairing a sewer invert according to the present invention.

FIG. 3 is a perspective view of an invert plate according to the present invention.

FIGS. 4A to 4G are plan views showing different embodiments of an invert plate according to the present invention. FIGS.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Foundation 3 Building block 4 Straight wall 5 Inclined frame 6 Adjusting frame 8 Receiving frame 9 Lid 11 Peripheral wall part 12 Bottom plate part 14 Outflow side drain pipe 15 Outflow side connection port 16 Inflow side drain pipe 18 Invert 17 Inflow side connection port 31 Basic Filler for concrete 32 Concrete block 33 Invert plate 34 Invert body 35 Inclined plate portion 36a Opening portion 36b Opening portion 37 Folding portion 38 Filling material

Claims (5)

(57) [Claims] A method for repairing a sewer invert in a sewer structure comprising a sewer manhole having a peripheral wall portion and a bottom plate portion, and an upper block having a narrow opening with respect to the peripheral wall portion, A bottom filler is provided with a base filler reinforced at a central portion, and a flexible invert plate that can be inserted into the opening of the sewer manhole is inserted through the opening from the opening on the upper surface of the base filler. The center of the inverting plate is placed in alignment with the reinforced central portion, and after caulking the periphery of the inverting plate, a filler is injected through an opening formed in the inverting plate, and the lower surface side of the inverting plate is A method for repairing sewer inverts, characterized by being filled with a filler. 2. The method for repairing a sewer invert according to claim 1, wherein the invert plate has a folded portion formed on a peripheral surface thereof in contact with a peripheral wall of the sewer manhole. 3. The caulking between the invert board and the peripheral wall of the manhole for sewerage is performed using a quick-drying cement for stopping water, a synthetic resin caulking agent, or the like. For repairing sewer inverts. 4. The method for repairing a sewer invert according to claim 1, wherein the invert plate is formed of a hard synthetic resin material having flexibility. 5. A hard synthetic resin material of said invert plate is F
The method for repairing a sewer invert according to claim 4, comprising RP.