JP6910635B2 - Underground structure covering method - Google Patents

Description

The present invention includes a vertical wall, the underground construction having a bottom groove is provided with a flow path, about the coating method of the underground construction for covering from the inside.

When sewage or sewage from individual dwellings is discharged to the main underground, it may pass through underground structures buried in the ground. This underground structure is called variously as a sewage basin, a sewage basin, a drainage basin, a connecting basin, etc., and a groove (invert) forming a flow path is provided at the bottom.

In such an underground structure, damage such as cracks and breakage may occur inside due to long-term use or an earthquake. Underground structures that have been damaged such as cracks or breaks inside are repaired by covering the inside of the underground structure with a lining member. Further, even if the underground structure is newly installed, the underground structure may be covered with a lining member from the inside because it is necessary to smooth the surface of the bottom portion.

Conventionally, as a technique of covering an underground structure from the inside with a lining member, after laying an uncured coating member impregnated with an uncured resin from the inside, a pressurizing expander is inflated according to the shape of the inside of the underground structure. Therefore, a technique has been proposed in which the uncured resin is cured while pressing the uncured coating member against the inner surface of the underground structure by the pressurizing expansion body (see, for example, Patent Document 1 and the like). In the technique described in Patent Document 1, a guide jig for attaching a pressurizing inflator is used, and by changing the planar shape of this guide jig according to the shape of the groove, the shape of the groove is not a straight type. The point to be dealt with is also described.

JP 2015-7339

However, the groove is not a so-called standard, and is generally made of mortar or the like at the construction site according to the situation of the piping or the like at the site where the underground structure is installed. Therefore, the shape and size of the groove are different for each underground structure, and the groove may have a plurality of branches, and the form of the groove is various. Therefore, it is difficult to deal with various forms of grooves only by deforming the guide jig as in the technique described in Patent Document 1.

In view of the above circumstances, an object of the present invention is to provide a coating method for an underground structure that can easily correspond to various types of grooves.

The method for covering an underground structure of the present invention that solves the above object is
A method of covering an underground structure having a vertical wall and a bottom having a groove forming a flow path from the inside.
A molding process in which a mold material is provided on the bottom in a molten state, a softened state, or a flexible state, and a part or all of the shape of the bottom is molded into the mold material.
A mold forming step of curing the mold material to form a mold,
A mold removal process for removing the cured mold from the underground structure,
A guide sheet molding step of molding a guide sheet having a shape that follows the shape of a part or all of the bottom portion using the taken-out mold.
It is characterized by having a guide sheet installation step of installing the guide sheet that follows the shape of a part or all of the bottom portion at the position of the shape.

Here, the mold material may be placed on the bottom in a molten, softened or flexible state, or may be changed to a melted, softened or flexible state after being placed on the bottom. good. Further, the molding step and the mold forming step may be steps performed in parallel. Further, in the molding step, a mold release agent may be applied to the bottom portion before the mold material is placed on the bottom portion, or a polyethylene film for easily peeling the mold from the bottom portion or the like. A sheet or the like may be arranged. Further, the bottom portion may be circular or rectangular in a plan view, and the vertical wall may be a curved surface or a flat surface.

According to the method of covering an underground structure of the present invention, a guide sheet that imitates the shape is formed by using a mold obtained by molding a part or all of the shape of the bottom portion, and the guide sheet is placed at the position of the shape. By installing it, it is possible to easily handle grooves of various shapes and sizes, and even branched grooves, which can contribute to the improvement of work efficiency and finished shape during on-site construction. ..

Moreover, in the coating method of the underground structure of the present invention,
The mold material is composed of water-reactivated resin powders and granules made of a synthetic resin containing a water-reactivated adhesive.
In the molding step, the water-reactivated resin powder or granular material is arranged so as to cover a part or all of the bottom portion, and water is applied to the water-reactivated resin powder or granular material to mold the water-reactivated resin powder or granular material as a molten state. It may be a process.

Here, in the molding step, the water-reactivated resin powder or granular material may be filled to a position higher than the lower end of the vertical wall by a predetermined height, or may be spread over a part or all of the bottom portion. good.

Further, the powder or granular material in the present application includes granules such as pellets and chips, granules such as beads and granules, and various powders, and the particle size thereof is not limited.

If the water-reactivated resin powder or granular material is used as the mold material, the molding step can mold the water-reactivated resin powder or granular material in a molten state by applying water to the water-reactivated resin powder or granular material, thereby improving work efficiency. It can be improved further.

Further, in the method of covering the underground structure of the present invention,
The mold material is composed of powders and granules to which an adhesive is applied.
The molding step is a step of providing the powder or granular material in a molten state with the adhesive so as to cover a part or all of the bottom portion and molding.
The guide sheet molding step may be a step of curing the adhesive.

Here, the adhesive may be a water-reactivated adhesive, a thermosetting type, a photo-curing type, or a water-curing type adhesive. Further, the adhesive may be coated on the powder or granular material before arranging the powder or granular material in a state of covering a part or all of the bottom portion, or a state of covering a part or all of the bottom portion. May be applied to the powder or granular material. Further, in the molding step, the powder or granular material may be filled to a position higher than the lower end of the vertical wall by a predetermined height, or may be spread over a part or all of the bottom portion. Further, the mold material is composed of a powder or granular material to which a water-reactivating adhesive or a water-curable adhesive is applied, and in the molding step, the powder or granular material is placed on the bottom portion before being placed on the bottom portion. Water may be sprayed or applied to a part or all of the above.

If the powder or granular material to which the adhesive is applied is used as the mold material, the guide sheet molding step can be completed by curing the adhesive, and the work efficiency can be further improved.

Moreover, in the coating method of the underground structure of the present invention,
The mold material is made of a thermoplastic resin powder or granular material made of a thermoplastic resin.
The molding step is a step of arranging the thermoplastic resin powder or granular material in a state of covering a part or all of the bottom portion and heating the thermoplastic resin powder or granular material to form a molten state. May be good.

Here, in the molding step, the resin powder or granular material may be spread over a part or all of the bottom portion.

Further, in the method of covering the underground structure of the present invention,
The mold material comprises a water-reactivated sheet material made of a synthetic resin containing a water-reactivated adhesive, or a water-reactivated sheet material in which a fiber sheet is impregnated with a synthetic resin containing a water-reactivated adhesive. ,
The molding step may be a step of applying water to the water reactivated sheet material to mold it in a softened state or a flexible state.

Here, in the molding step, water may be sprayed or applied to a part or all of the bottom portion before arranging the water reactivating sheet material.

Moreover, in the coating method of the underground structure of the present invention,
The mold material is made of a thermoplastic sheet material made of a thermoplastic resin or a shape memory resin.
The molding step may be a step of heating the thermoplastic sheet material and molding it in a softened state.

Here, if a thermoplastic sheet material made of a shape memory resin is used as the mold material, the thermoplastic sheet material can be used as the mold and then heated to return to the sheet shape as the mold material. Can be reused.

Further, in the method of covering the underground structure of the present invention,
The mold material is made of a hydraulic sheet material in which a fiber sheet is impregnated with a hydraulic resin.
The molding step is a step of installing the hydraulic sheet material in a flexible state on the bottom so as to follow the shape of a part or all of the bottom and molding.
The mold forming step may be a step of curing the hydraulic resin by applying water to the hydraulic sheet material.

Here, the hydraulic resin may be a hydraulic polyurethane resin.

Moreover, in the coating method of the underground structure of the present invention,
The mold material is made of foamed resin.
The molding step may be a step of spraying the foamed resin onto all or part of the bottom to mold.

Here, the foamed resin may be a urethane foam resin.

In addition, the guide sheet installation process
An uncured coating member laying step of laying an uncured coating member impregnated with an uncured resin on the bottom from the inside,
A guide sheet arranging step of arranging the guide sheet that follows the shape of a part or all of the bottom portion at the position of the shape inside the uncured coating member.
It consists of a curing step of curing the uncured resin.
An underground structure coating method may be used in which the construction of the guide sheet is completed while the uncured resin is left together with the cured coating member by carrying out the curing step.

Further, the mold forming step is a step of molding a part or all of the shape from a position above the lower end of the vertical wall to the bottom of the vertical wall into the mold structure.
The guide sheet molding step is a step of molding a guide sheet having a shape that conforms to a part or all of the shape from the position on the vertical wall to the bottom portion.
The uncured coating member laying step is a step of laying the uncured coating member from the position to the bottom.
The guide sheet arranging step is a step of arranging the guide sheet that follows the shape of a part or all of the vertical wall from the position to the bottom inside the uncured coating member at the position of the shape. It may be.

Further, a vertical wall guide sheet arranging step of arranging the vertical wall guide sheet that follows the shape of the vertical wall from the lower end to the upper side inside the portion of the uncured covering member that covers the vertical wall. You may have.

According to the coating method of underground structures of the present invention, it is possible to provide a coating method easy underground structures correspond to the grooves of various forms.

It is a figure which shows an example of a sewage basin. It is a flowchart which shows an example of the covering method of the sewage basin shown in FIG. FIG. 2 is a schematic diagram showing a stepwise state from the mold taking process to the mold taking out process shown in FIG. It is a figure which conceptually shows the state of molding a guide sheet using the mold shown in FIG. It is a perspective view which shows the covering member for a bottom part. It is a schematic diagram which shows the state of the first half part of the guide sheet installation process shown in FIG. It is a schematic diagram which shows the state of the latter half part of the guide sheet installation process shown in FIG. It is a schematic diagram which shows the state from the mold taking process to the mold taking out process step by step in the 1st modification. It is a schematic diagram which shows the state from the mold taking process to the mold taking out process step by step in the 2nd modification. It is a schematic diagram which shows the state from the mold taking process to the mold taking out process step by step in the 3rd modification. It is a schematic diagram which shows the state from the mold taking process to the mold taking out process step by step in the 4th modification. It is a schematic diagram which shows the state of the first half part in the modification of the guide sheet installation process. It is a schematic diagram which shows the state of the latter half part in the modification of the guide sheet installation process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the underground structure that is the subject of the method for covering the underground structure of the present invention will be described. The underground structure referred to here is a structure in which a groove (invert) forming a flow path is provided at the bottom, and is referred to in various ways such as a sewage basin, a sewage basin, a drainage basin, and a connecting basin. However, in the following, a sewage basin will be described as an example.

FIG. 1 is a diagram showing an example of a sewage basin, in which the left side of the figure is upstream and the right side is downstream.

FIG. 1A is a cross-sectional view of a sewage basin. In the sewage basin 5 shown in FIG. 1A, three side masses 521 to 523 are stacked on the bottom mass 51. Hereinafter, among the three side lumps, the bottom side lump may be referred to as a lower lump 521, the top side lump may be referred to as an upper lump 523, and the middle side lump may be referred to as a middle lump 522. Further, a deformed mass 53 is placed on the upper mass 523. Further, an edge mass 54 is placed on the deformed mass 53, and the edge mass 54 functions as a frame body that supports the lid 55 of the sewage basin 5. The bottom mass 51, the three side masses 521-523, the deformed mass 53, and the edge mass 54 are all made of concrete and are connected to each other. The lid 55 is made of cast iron or concrete. Further, the three side masses 521 to 523, the deformed mass 53, and the edge mass 54 are all cylindrical (cylindrical), and the inner peripheral surface 501 is formed. This inner peripheral surface 501 corresponds to an example of a vertical wall. The three side masses 521 to 523, the deformed mass 53, and the edge mass 54 may all form a square box (square tube). That is, the vertical wall is not limited to a curved surface but may be a flat surface.

FIG. 1B is a view (plan view) of the bottom mass shown in FIG. 1A as viewed from directly above.

The bottom mass 51 is provided with a groove (hereinafter, referred to as an invert 511) forming a flow path, and this bottom mass 51 corresponds to an example of the bottom portion. In FIG. 1B, the invert 511 having an arcuate cross-sectional shape and extending linearly from the upstream to the downstream is shown by a solid line. The cross-sectional shape of the invert may be U-shaped, or it may have a curved or bent portion in a plan view, such as the invert 511'shown by the alternate long and short dash line in FIG. 1 (b), and further, the alternate long and short dash line. As shown by, there are various modes such as having a branch portion 5111. A drainage pipe 6 is connected to the upstream side of the invert 511, and a mounting pipe 7 is attached to the downstream side of the invert 511. Further, in the embodiment having the branch portion 5111, the attachment pipe 7 is also attached to the downstream side of the branch portion 5111. As described above, the form of the invert 511 is various, but in the following, in order to simplify the description and the drawings, the cross-sectional shape shown by the solid line in FIG. 1 (b) is an arc shape and extends in a straight line in a plan view. An embodiment in which the existing invert 511 is provided on the bottom mass 51 will be described as an example.

The bottom mass 51 is provided with an inclined surface 512 that is gradually inclined downward from the lower end 521b of the lower mass 521 shown in FIG. 1A toward the opening edge 511e of the invert 511. As shown in FIG. 1 (b), the shape of the inclined surface 512 is semicircular, and the arcuate edge 512r is in contact with the lower end 521b of the lower mass 521.

FIG. 2 is a flowchart showing an example of the sewage basin covering method shown in FIG.

The sewage basin coating method shown in FIG. 2 includes a molding step (step 1), a mold forming step (step 2), a mold taking out step (step 3), a guide sheet molding step (step 4), and a guide sheet installation step (step). 5). Further, the guide sheet installation step (S5) includes a uncured coating member laying step (step 51), a guide sheet arranging step (step 52), and a curing step (step 53).

FIG. 3 is a schematic diagram showing a stepwise state from the mold taking step (S1) to the mold taking out step (S3) shown in FIG. Note that FIG. 3 (a) shows the state of the mold taking process (S1), FIG. 3 (b) shows the state of the mold forming step (S2), and FIG. 3 (c) shows the state of the mold taking out process (S3). Is shown.

In the molding step (S1) shown in FIG. 3 (a), after installing a plug or the like to stop water in the drain pipe 6 (see FIG. 1) on the upstream side, the water-reactivated resin powder or granular material B1 as a mold material Is arranged on the bottom side of the sewage basin 5 so as to cover the inner surface of the bottom mass 51. Before arranging the water-reactivated resin powder or granular material B1, a mold release agent is applied to the bottom side of the sewage basin 5 in advance, or a polyethylene film, sheet, or the like is arranged, which will be described later. This is preferable because the mold 9 is easily peeled off.

The water-reactivated resin powder or granular material B1 of the present embodiment is spherical beads having a particle size of about 1 mm to several mm, and is formed by molding a synthetic resin containing a water-reactivated adhesive such as polyvinyl alcohol. .. The water-reactivated adhesive is a water-based adhesive that melts when it comes into contact with a liquid such as water and hardens when the water evaporates. The water-reactivated resin powder or granular material B1 is not limited to beads, but may be pellets, chips, granules, or the like, and may be a powder having an average particle size of about several tens of μm to several hundreds of μm. In the present embodiment, the water-reactivated resin powder or granular material B1 is filled to a position higher than the lower end 521b of the lower mass 521 by a predetermined height.

Next, water is supplied to the water-reactivated resin powder or granular material B1 from the hose H or the like to bring the water-reactivated resin powder or granular material B1 into a molten state. By doing so, the shape from the position above the lower end 521b of the lower mass 521 to the bottom mass 51 can be molded into the water-reactivated resin powder or granular material B1. Further, the take-out rod 81 is inserted before the molten water-reactivated resin powder or granular material B1 is cured.

Moisture is evaporated from the water-reactivated resin powder or granular material B1 by leaving it as it is or by blowing air using a fan or the like, and as shown in FIG. 3 (b), the water-reactivated resin powder or granular material B1 is cured to form a mold. 9 is formed (S2). Next, the take-out rod 81 is pulled up, the mold 9 is peeled off from the bottom mass 51 and the like as shown by the arrow in FIG. 3C, and the mold 9 is taken out from the sewage basin 5 (S3). As a result, a mold 9 having a mold surface 91 having a shape that resembles the shape from a position above a predetermined height above the lower end 521b of the lower mass 521 to the bottom mass 51 can be obtained.

Here, the water-reactive resin powder or granular material B1 may be a powder or granular material made of polyvinyl chloride or the like coated with a water-reactive adhesive. Further, after filling the bottom side of the sewage basin 5 with powder or granular material made of polyvinyl chloride or the like, as shown by the alternate long and short dash line in FIG. 3A, a water-reactivated adhesive in a molten state to which water is added is applied. It may be applied to the powder or granular material from above. In the case where the water reactivating adhesive is applied to the powder or granular material from above, the supply of water becomes unnecessary.

Further, instead of the water-reactivated resin powder and granules B1, a water-curable resin powder and granules B2 made of a synthetic resin containing a water-curable adhesive such as a water-curable polyurethane resin and a water-curable adhesive can be used. Coated water-curable resin powder granules B2 may be used. Further, after filling the bottom side of the sewage basin 5 with a powder or granular material made of polyvinyl chloride or the like, a molten water-curable adhesive may be applied to the powder or granular material from above. The water-curable adhesive is an adhesive that cures when it comes into contact with a liquid such as water, and is a water-curable resin powder by supplying water from a hose H or the like as shown by a single point chain line in FIG. 3 (b). Granule B2 is cured (S2).

FIG. 4 is a diagram conceptually showing a state in which a guide sheet is molded using the mold shown in FIG.

As shown in FIG. 4, the mold surface 91 of the mold 9 taken out from the sewage basin has an invert mold surface 91a having a shape following the shape of the invert 511, and an inclined surface mold surface 91b having a shape following the shape of the inclined surface 512. It also has a lower mass-shaped surface 91c having a shape that follows the shape up to a position above a predetermined height from the lower end 521b of the lower mass 521.

The method for molding the guide sheet is not particularly limited, but the guide sheet can be molded by the hand lay-up method, for example, in a factory or the like. Specifically, after the glass mat is formed on the mold surface 91 sprayed with the gel coat, the epoxy resin of the thermosetting resin is laminated to a predetermined thickness while being defoamed with a brush or a roller. After that, the thermosetting resin is cured in a constant temperature bath or the like to mold the guide sheet 21.

As shown by the arrows in FIG. 4, the guide sheet 21 demolded from the mold 9 has an invert portion 21a having a shape following the shape of the invert 511, an inclined surface portion 21b having a shape following the shape of the inclined surface 512, and a lower portion. It has a lower lump portion 21c having a shape that follows the shape up to a position above a predetermined height from the lower end 521b of the side lump 521. By forming a mold 9 in which the shape of the bottom side of the sewage basin 5 is molded in this way and molding the guide sheet 21 using this mold 9, it is curved or bent in a plan view as shown in FIG. 1 (b). It is possible to easily obtain a guide sheet 21 corresponding to various forms of invert, such as an invert 511'having a portion to be used and an embodiment having a branch portion 5111.

Next, the covering member used in the covering method of the underground structure of the present embodiment will be described. The covering member covers the underground structure to be constructed from the inside, and is divided into a bottom covering member and a vertical wall covering member in the present embodiment. , The glass mat is impregnated with epoxy resin. The glass mat has a two-layer structure consisting of a layer of woven glass fibers orthogonal to each other (roving cloth) and a layer of glass fibers cut into short fibers (chopped strand mat), and has a thickness of 0.5 to 3. It is about 0 mm.

FIG. 5 is a perspective view showing a bottom covering member.

The bottom covering member 11 is integrated into a shape corresponding to the shape of the mold 9 by cutting out parts from a glass mat based on the shape of the mold 9 and adhering these parts with a hot melt gun, for example. .. The bottom covering member 11 has an invert portion 11a corresponding to the invert portion 21a of the guide sheet 21, an inclined surface portion 11b corresponding to the inclined surface portion 21b, and a lower mass portion 11c corresponding to the lower mass portion 21c. ing. Further, the vertical wall covering member 15 is a glass mat formed in a cylindrical shape. The bottom covering member 11 and the vertical wall covering member 15 prepared in this way are impregnated with the epoxy resin of the thermosetting resin. Specifically, an epoxy resin of a thermosetting resin is used as a main agent, a curing agent, an adhesive and a defoaming agent are added to the main agent, and these are stirred to prepare an uncured resin for impregnation. Then, the bottom covering member 11 and the vertical wall covering member 15 are separately placed on the two polyethylene films prepared in advance, and the uncured resin for impregnation is imprinted on one side of each with a spatula. .. Subsequently, each of the bottom covering member 11 and the vertical wall covering member 15 is turned inside out, and the impregnated uncured resin is imprinted on the other surface with a spatula. After that, the bottom covering member 11 and the vertical wall covering member 15 are separately sandwiched between the polyethylene films and squeezed with a roller in that state, and the bottom covering member 11 and the vertical wall covering member 15 are each uncured for impregnation. Thoroughly impregnate the resin. As a result, the uncured bottom covering member 11'and the uncured vertical wall covering member 15'are obtained.

FIG. 6 is a schematic view showing the state of the first half portion of the guide sheet installation step S5 shown in FIG. 2, and FIG. 7 is a schematic view showing the state of the latter half portion of the guide sheet installation step S5 shown in FIG. In addition, in FIG. 6 and FIG. 7, the uncured bottom covering member 11 ′ and the cured bottom covering member 11 ″ which is cured by the uncured bottom covering member 11 ′ are shown by broken lines. Further, the uncured vertical wall covering member 15 ′ and the cured vertical wall covering member 15 ″ which is cured by the uncured vertical wall covering member 15 ″ are indicated by a long-dotted chain line.

As shown in FIG. 6A, with the uncured bottom covering member 11'overlaid on the lower side of the guide sheet 21, the bottom side of the sewage basin 5 corresponds to that as shown in FIG. 6B. Place in position. As a result, the uncured covering member laying step S51 and the guide sheet arranging step S52 shown in FIG. 2 are carried out in parallel. First, the uncured bottom covering member 11'is laid on the bottom side of the sewage basin 5. (Uncured coating member laying step S51), and the guide sheet 21 may be arranged on the guide sheet 21 (guide sheet arrangement step S52). The guide sheet 21 is flexible, and the invert portion 21a of the guide sheet 21 and the invert portion 11a of the uncured bottom covering member 11'are pushed into the invert 511.

Subsequently, as shown in FIG. 6C, a packer 4 which is a pressure expansion body is installed in the sewage basin 5. The packer 4 has a frame 42, a rubber sleeve 43 that covers the frame 42 from the outside, an upper plate 44, and a lower plate 45. The rubber sleeve 43 is fixed in the circumferential direction at both ends of the frame 42, and when compressed air is supplied between the frame 42 and the rubber sleeve 43, the rubber sleeve 43 expands in the radial direction of the packer 4. .. A compressed air supply pipe 46 for supplying compressed air passes through the frame 42, one end side of the compressed air supply pipe 46 becomes an upper plate 44, and the other end side is between the frame 42 and the rubber sleeve 43. You are connected. Further, heating air is supplied to the space S in the frame 42 from the ground side. The upper plate 44 is provided with a central opening 441, and the lower plate 45 is also provided with a central opening 451. These central openings 441 and 451 are openings connected to the space S.

In FIG. 6C, the packer 4 is already installed in the sewage basin 5, but before the packer 4 is installed in the sewage basin 5, the rubber sleeve 43 of the packer 4 is covered with an uncured vertical wall on the ground. Wrap the member 15'. At this time, the ends of the uncured vertical wall covering member 15'are overlapped with each other, and the position is adjusted so that the lower end portion of the uncured vertical wall covering member 15' reaches around the lower plate 45 of the packer 4. do. When the packer 4 is lowered into the sewage basin 5, the weight of the packer 4 is applied to the inclined surface portion 21b of the guide sheet 21, and the guide sheet 21 and the covering member 11'for the uncured bottom are placed on the inner peripheral wall 511a of the invert 511 and the uncured bottom covering member 11'. It is pressed against the inclined surface 512. A packer may be provided with a heat-resistant cushion material having high thermal conductivity below the lower plate 45 of the packer 4, and the weight of the packer 4 may be applied to the guide sheet 21 via the cushion material. After installing 4 in the sewage basin 5, the supply of compressed air to the compressed air supply pipe 46 is started. As a result, the rubber sleeve 43 of the packer 4 begins to expand in the radial direction. As the rubber sleeve 43 expands, the amount of overlap between the ends of the uncured vertical wall covering member 15'wound around the rubber sleeve 43 decreases and the diameter increases.

Next, the supply of heated air from the central opening 441 of the upper plate 44 to the space S is started. The heating air is air heated on the ground side by a jet heater or the like, and when it reaches the space S, it is about 40 ° C. to 70 ° C. The frame 42 is heated by the supplied heating air. Further, the supplied heating air is blown out from the central opening 451 of the lower plate 45, and is also heated below the lower plate 45.

In FIG. 7D, the rubber sleeve 43 of the packer 4 is sufficiently expanded, and the uncured vertical wall covering member 15'is inside the sewage basin 5 from the lower mass 521 to the upper mass 523 at a predetermined pressure. It is pressed against the peripheral surface 501. Further, the lower end portion of the uncured vertical wall covering member 15'covers the lower lump portion 21c of the guide sheet 21.

In this way, the compressed air is supplied to the packer 4, the pressure in the space between the frame 42 and the rubber sleeve 43 is maintained at a predetermined pressure for a predetermined time, and the heated air is continuously supplied to the space S in the packer 4 for a predetermined time. As a result, the uncured vertical wall covering member 15'is heated from the inside of the packer 4 for a predetermined time in a state of being pressed against the inner peripheral surface 501 of the sewage basin 5. Further, the uncured bottom covering member 11'is pressed against the inner peripheral wall 511a and the inclined surface 512 of the invert 511 by the weight of the packer 4, and is similarly heated by the heated air blown out from the central opening 451 of the lower plate 45. It is heated for a predetermined time. The work here corresponds to an example of the work of the curing step S53.

After a lapse of a predetermined time, the supply of compressed air and heating air to the packer 4 is stopped, and the pressure in the space between the frame 42 and the rubber sleeve 43 is released to contract the rubber sleeve 43. Then, the packer 4 is pulled up to the ground.

FIG. 7 (e) is a diagram showing a cross section of the sewage basin 5 for which the construction by the coating method of the present embodiment has been completed.

In FIG. 7 (e), the uncured bottom coating member 11 ″ impregnated with the uncured bottom coating member 11 ′ is impregnated with the cured bottom coating member 11 ″ and the uncured vertical wall coating member 15 ′ is impregnated. A cured vertical wall covering member 15'' in which the uncured resin has been cured is shown. The cured bottom coating member 11 ″ and the cured vertical wall coating member 15 ″ correspond to an example of the cured coating member. In addition, a guide sheet 21 is also shown, and it can be seen that the construction is completed with the guide sheet 21 also retained. Further, since the guide sheet 21 is made of the same material as the hardened bottom covering member 11 ″, it becomes integrated with the hardened bottom covering member 11 ″ after the construction is completed. Further, the inner surface of the sewage basin 5 and the guide sheet can be integrated with the resin impregnated in the uncured bottom coating member 11'between the inner surface (511a, 512, 501) of the sewage basin 5 and the guide sheet 21. can. In order to enhance this integration, the size of the uncured bottom covering member 11'is preferably larger than the size of the guide sheet 21. In addition, the guide sheet 21 has a smooth inner surface. The inner surface referred to here is a surface opposite to the cured bottom coating member 11 ″ side, and here is an exposed surface (coating surface). As a result, wrinkles are eliminated from the coating surface, foreign matter is caught in the wrinkles and causes clogging of the invert, and sewage and the like are significantly reduced. In addition, since there are no wrinkles on the coating surface, the goodness of the finish after the completion of construction becomes conspicuous.

Further, the portion circled by the thin alternate long and short dash line in FIG. 7 (e) is the joint between the cured vertical wall covering member 15 ″ and the guide sheet 21, and is the lower end portion of the cured vertical wall covering member 15 ″. And the lower lump portion 21c of the guide sheet 21 overlap. Therefore, even at the joint, the inner peripheral surface 501 of the sewage basin 5 is not exposed and is surely covered. Further, this overlapping portion is near the boundary between the bottom mass 51 and the lower mass 521, where the roots of the tree are most likely to invade, and this vicinity is the lower end portion of the hardened vertical wall covering member 15 ″ and the guide sheet 21. By covering with the double structure of the lower mass portion 21c, it is possible to prevent the invasion of the roots of the tree.

According to the method of covering the underground structure of the present embodiment, even if the invert 511'having a curved or bent portion or the branch portion 5111 is provided as shown in FIG. It can be constructed by forming and installing a guide sheet molded using this mold. That is, it is possible to easily deal with various types of inverts, and it is possible to contribute to the improvement of work efficiency and finished form at the time of on-site construction.

Next, a modified example of the steps from the mold taking step (S1) to the mold taking out step (S3) shown in FIG. 3 will be described. In the modification described below, the differences from the embodiment shown in FIG. 3 will be mainly described, and the components having the same names as the components in the embodiment shown in FIG. , And duplicate explanations may be omitted.

FIG. 8 is a schematic view stepwise showing the state from the mold taking step (S1) to the mold taking out step (S3) in the first modification.

In the first modification, the thermoplastic resin powder or granular material B3 made of a thermoplastic resin is used as the mold material. The thermoplastic resin powder or granular material B3 of the first modification is spherical beads having a particle size of about 1 mm to several mm, and is produced by molding a thermoplastic resin such as polyethylene. The thermoplastic resin powder or granular material B3 is not limited to beads, but may be pellets, chips, granules, or the like, and may be a powder having an average particle size of about several tens of μm to several hundreds of μm.

After applying a mold release agent to the inner peripheral wall 511a and the inclined surface 512 of the invert 511 in advance, as shown in FIG. 8A, the thermoplastic resin powder or granular material B3 covers the inner peripheral wall 511a and the inclined surface 512. Spread out. Next, the thermoplastic resin powder or granular material B3 is heated by blowing hot air from the hot air fan F to bring the thermoplastic resin powder or granular material B3 into a molten state. By doing so, the shapes of the inner peripheral wall 511a and the inclined surface 512 of the invert 511 can be molded into the thermoplastic resin powder or granular material B3.

It is left as it is, or it is cooled by blowing air from a fan or the like, and as shown in FIG. 8B, the thermoplastic resin powder or granular material B3 is cured to form a mold 9 (S2). Next, as shown by the arrow in FIG. 8C, the mold 9 is peeled off from the bottom mass 51 and taken out from the sewage basin 5 (S3). As a result, a mold 9'having a mold surface 91'having a shape that follows the shape of the inner peripheral wall 511a of the invert 511 and the inclined surface 512 can be obtained. The mold surface 91'of the mold 9'is composed of an invert mold surface 91a and an inclined surface mold surface 91b, and does not have the lower massive surface 91c of the mold 9 shown in FIG.

Here, the thermoplastic resin powder or granular material B3 may be a powder or granular material made of polyvinyl chloride or the like coated with a thermoplastic adhesive. Further, after laying powder or granular material made of polyvinyl chloride or the like so as to cover the inner peripheral wall 511a and the inclined surface 512 of the invert 511, a molten thermoplastic adhesive is applied as shown by the alternate long and short dash line in FIG. 8A. It may be applied to the powder or granular material from above. In the case where the thermoplastic adhesive is applied to the powder or granular material from above, the heating in FIG. 8A becomes unnecessary.

Further, instead of the thermoplastic resin powder granules B3, a thermosetting resin powder granules B4 coated with an epoxy resin-based or acrylic resin-based thermosetting adhesive may be used. Further, after laying powder or granular material made of polyvinyl chloride or the like so as to cover the inner peripheral wall 511a and the inclined surface 512 of the invert 511, the thermosetting adhesive in a molten state is shown as shown by the alternate long and short dash line in FIG. 8A. May be applied to the powder or granular material from above. In the case of this aspect, the mold 9 is obtained by heating with a hot air fan F or the like in FIG. 8B to cure the thermosetting adhesive.

Furthermore, instead of the thermoplastic resin powder or granular material B3, a photocurable resin powder or granular material B5 coated with an epoxy resin-based or acrylic resin-based photocurable adhesive may be used. Further, after laying powder or granular material made of polyvinyl chloride or the like so as to cover the inner peripheral wall 511a and the inclined surface 512 of the invert 511, the photocurable adhesive in a molten state is shown by the alternate long and short dash line in FIG. 8A. May be applied to the powder or granular material from above. In the case of this aspect, in FIG. 8B, the mold 9 is obtained by irradiating the photocurable resin powder or granular material B5 with ultraviolet rays or the like from the light R to cure the photocurable adhesive.

In the first modification shown in FIG. 8, a mold material such as a thermoplastic resin powder or granular material B3 is spread so as to cover the inner peripheral wall 511a and the inclined surface 512 of the invert 511, but the lower end of the lower mass 521 is further spread. The thermoplastic resin powder or granular material B3 or the like may be arranged up to a position above the predetermined height of 521b.

FIG. 9 is a schematic view stepwise showing the state from the mold taking step (S1) to the mold taking out step (S3) in the second modification.

In the second modification, the thermoplastic resin sheet SH1 made of a thermoplastic resin such as polyvinyl chloride is used as the mold material.

After applying a mold release agent in advance from a position above a predetermined height above the lower end 521b of the lower lump 521 to the bottom lump 51, as shown in FIG. 9A, a thermoplastic resin sheet is applied to the bottom side of the sewage basin 5. Place SH1. Here, the thermoplastic resin sheet SH1 is of a size capable of covering up to a position above a predetermined height from the lower end 521b of the lower mass 521.

Then, as shown by the alternate long and short dash line in FIG. 9 (a), the thermoplastic resin sheet SH1 is softened by blowing hot air from the hot air fan F, and then the pressing rod 82 and the like are pressed as shown in FIG. 9 (b). The thermoplastic resin sheet SH1 is pressed against the inner peripheral wall 511a of the invert 511, the inclined surface 512, and the lower end 521b side portion of the lower mass 521 (S1).

The thermoplastic resin sheet SH1 is cured by leaving it as it is or by blowing air from a fan or the like to form a mold 9 (S2). Next, as shown by the arrow in FIG. 9C, the mold 9 is peeled off from the bottom mass 51 and taken out from the sewage basin 5 (S3). As a result, a mold 9 having a mold surface 91 having a shape that resembles the shape from a position above a predetermined height above the lower end 521b of the lower mass 521 to the bottom mass 51 can be obtained.

Here, instead of the thermoplastic resin sheet SH1, a shape memory resin sheet SH2 made of a shape memory resin may be adopted. Further, a thermoplastic resin sheet SH3 made of a synthetic resin containing a water-reactivating adhesive such as polyvinyl alcohol may be used. In the embodiment using the thermoplastic resin sheet SH3, as shown by the one-point chain line in FIG. 9 (a), water is supplied from the hose H to the thermoplastic resin sheet SH3 to soften it, and as shown in FIG. 9 (b). , The thermoplastic resin sheet SH3 is pressed against the inner peripheral wall 511a of the invert 511, the inclined surface 512, and the lower end 521b side portion of the lower mass 521 using a pressing rod 82 or the like, and then water is reactivated by evaporating the water content. The agent may be cured.

FIG. 10 is a schematic view stepwise showing the state from the mold taking step (S1) to the mold taking out step (S3) in the third modification.

In the third modification, as the mold material, a hydraulic fiber sheet SH4 in which a continuous fiber sheet made of carbon, aramid, vinylon or the like is impregnated with a hydraulic resin such as a hydraulic polyurethane resin is adopted.

Similar to the second modification shown in FIG. 9, as shown in FIG. 10A, the hydraulic fiber sheet SH4 in a flexible state is arranged on the bottom side of the sewage basin 5. Then, as shown in FIG. 10B, the hydraulic fiber sheet SH4 is pressed against the inner peripheral wall 511a of the invert 511, the inclined surface 512, and the lower end 521b side portion of the lower mass 521 using a pressing rod 82 or the like (S1). ).

Next, as shown in FIG. 10 (c), the hydraulic fiber sheet SH4 is cured by supplying water from the hose H to the hydraulic fiber sheet SH4 to form a mold 9 (S2). Next, as shown by the arrow in FIG. 9C, the mold 9 is peeled off from the bottom mass 51 and taken out from the sewage basin 5 (S3).

A polyethylene film or sheet may be provided in advance on the bottom side of the sewage basin 5, and the hydraulic fiber sheet SH4 may be arranged after spraying water on the film. According to this aspect, by pressing the hydraulic fiber sheet SH4 with the pressing rod 82 or the like shown in FIG. 10B, the water sprayed in advance and the hydraulic resin impregnated in the hydraulic fiber sheet SH4 Reacts and curing progresses.

FIG. 11 is a schematic view stepwise showing the state from the mold taking step (S1) to the mold taking out step (S3) in the fourth modified example.

In the fourth modification, a foamed resin such as urethane foam (urethane foam) is used as the mold material.

After applying the mold release agent in advance, as shown in FIG. 11A, molding is performed by spraying, for example, urethane foam W from the bottom mass 51 to a position above the lower end 521b of the lower mass 521 by a predetermined height. (S1). Then, as shown in FIG. 11B, the take-out rod 81 is inserted into the urethane foam W and cured for a predetermined time to be cured (S2). Next, as shown by the arrow in FIG. 11C, the take-out rod 81 is pulled up to peel off the mold 9 from the bottom mass 51, and the mold 9 is taken out from the sewage basin 5 (S3). As a result, a mold 9 having a mold surface 91 having a shape that resembles the shape from a position above a predetermined height above the lower end 521b of the lower mass 521 to the bottom mass 51 can be obtained. In the mold 9 formed by the step of the fourth modification, holes of urethane foam bubbles may remain on the mold surface 91. In that case, for example, polyester putty or the like may be left on the mold surface 91. You may serve it.

Next, a modified example of the guide sheet installation step (S5) shown in FIGS. 6 and 7 will be described. In the modification described below, the differences from the embodiments shown in FIGS. 6 and 7 will be mainly described, and the components having the same names as the components in the embodiments shown in FIGS. 6 and 7 will be described. , The description will be given with the reference numerals used so far, and duplicate explanations may be omitted.

FIG. 12 is a schematic view showing the state of the first half portion in the modified example of the guide sheet installation step S5, and FIG. 13 is a schematic diagram showing the state of the latter half portion in the modified example of the guide sheet installation step S5.

In this modification, the guide sheet 21'molded by the mold 9'obtained in the first modification shown in FIG. 8 is used. As described above, the mold surface 91'of the mold 9'does not have the lower massive surface 91c of the mold 9 shown in FIG. Therefore, as shown in FIG. 12A, the guide sheet 21'molded by the mold 9'is composed of an invert portion 21a and an inclined surface portion 21b, and the lower lump portion 21c of the guide sheet 21 shown in FIG. 4 is formed. I don't have it. On the other hand, also in this modified example, the uncured bottom coating member 11'in which the bottom coating member 11 shown in FIG. 5 is impregnated with a thermosetting resin is used. The uncured bottom covering member 11'overlaid on the lower side of the guide sheet 21'has its lower lump portion 11c folded back onto the inclined surface portion 21b of the guide sheet 21'.

As shown in FIG. 12 (b), the guide sheet 21'and the uncured bottom covering member 11'stacked in this way are arranged at corresponding positions on the bottom side of the sewage basin 5. The folded lower lump portion 11c of the uncured bottom covering member 11'may be brought into contact with the inner peripheral surface 501 of the lower lump 521 from the ground using a rod or the like. As a result, the uncured coating member laying step S51 and the guide sheet arranging step S52 shown in FIG. 2 are carried out in parallel.

Subsequently, in this modification, the vertical wall guide sheet arranging step is carried out. As shown in a circle in FIG. 12 (c), the vertical wall guide sheet 22 is formed in a state where the ends of the strip-shaped sheets overlap each other, and is made of the same material as the guide sheet 21. There is. Further, the vertical wall guide sheet 22 is formed with a semicircular notch 221. The notch 221 is a portion corresponding to the drainage pipe 6 and the mounting pipe 7 shown in FIG. An uncured vertical wall lower covering member 13'having substantially the same shape as the vertical wall guide sheet 22 is wound around the outer circumference of the vertical wall guide sheet 22. The lower covering member 13'for the uncured vertical wall is made of the same material as the covering member 15'for the uncured vertical wall.

As shown in FIG. 12 (c), the vertical wall guide sheet 22 and the uncured vertical wall lower covering member 13'are arranged inside the lower lump portion 11c of the uncured bottom covering member 11'. .. The vertical wall guide sheet 22 and the uncured vertical wall lower covering member 13'may be arranged separately.

Subsequently, a packer 4 which is a pressure expansion body is installed in the sewage basin 5. The lower end portion of the uncured vertical wall covering member 15'wound around the packer 4 is adjusted so as to overlap the upper end portion of the arranged vertical wall guide sheet 22.

After installing the packer 4 in the sewage basin 5, the supply of compressed air to the compressed air supply pipe 46 is started. As a result, the rubber sleeve 43 of the packer 4 begins to expand in the radial direction. As the rubber sleeve 43 expands, the amount of overlap between the ends of the uncured vertical wall covering member 15'wound around the rubber sleeve 43 decreases and the diameter increases. Further, both the lower covering member 13'for the uncured vertical wall and the guide sheet 22 for the vertical wall are expanded in diameter by reducing the amount of overlap between the ends as the rubber sleeve 43 expands. Next, the heating air is started to be supplied to the space S in the frame 42 of the packer 4 from the central opening 441 of the upper plate 44.

In FIG. 13D, the rubber sleeve 43 of the packer 4 is sufficiently expanded, and the uncured vertical wall covering member 15'is inside the sewage basin 5 from the middle lump 522 to the upper lump 523 at a predetermined pressure. It is pressed against the peripheral surface 501. Further, the lower covering member 13'for the uncured vertical wall is pressed against the inner peripheral surface 501 from the lower lump 521 to the middle lump 522 of the sewage basin 5 with a predetermined pressure. Further, the vertical wall guide sheet 22 is pressed against the uncured vertical wall lower covering member 13'with a predetermined pressure. When the uncured resins are cured after a lapse of a predetermined time in such a state, the supply of compressed air and heating air to the packer 4 is stopped, and the pressure in the space between the frame 42 and the rubber sleeve 43 is released. Then, the rubber sleeve 43 is shrunk. Finally, the packer 4 is pulled up to the ground to complete the construction.

FIG. 13 (e) is a diagram showing a cross section of the sewage basin 5 for which the construction of this modified example has been completed.

The portion circled by a thin solid line in FIG. 13 (e) is the joint between the cured vertical wall covering member 15 ″ and the vertical wall guide sheet 22, and is the lower end portion of the cured vertical wall covering member 15 ″. And the upper end portion of the vertical wall guide sheet 22 overlap. Therefore, even at the joint, the inner peripheral surface 501 of the sewage basin 5 is not exposed and is surely covered. Further, in the portion circled by the thin alternate long and short dash line in FIG. 13 (e), the lower end portion of the cured vertical wall lower covering member 13 ″ and the lower lump portion 11c of the cured bottom covering member 11 ″ overlap. ing. This overlapping portion is near the boundary between the bottom mass 51 and the lower mass 521, where the roots of the tree are most likely to invade, and this area is the lower end portion of the lower covering member 13 ″ for the cured vertical wall and the coating for the cured bottom. Since the double structure of the lower mass portion 11c of the member 11'' and the lower end portion of the vertical wall guide sheet 22 also exist inside, by covering with a triple structure, the invasion of the roots of the tree is more reliable. You can stop it.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims. For example, in the embodiment described above, the construction target is a sewage basin, but the present invention can be widely applied to an underground structure provided with a groove forming a flow path at the bottom. Further, the present invention can be applied not only to the repair of an existing underground structure but also to a newly constructed underground structure. Further, in the above-described embodiment, the mode of obtaining the mold 9 having the invert mold surface 91a, the inclined surface mold surface 91b, and the lower massive surface 91c has been described as an example, but depending on the mode of the invert 511 and the like. , May be divided into multiple types. Further, the guide sheet 21 may be divided into an invert portion 21a, an inclined surface portion 21b, and a lower lump portion 21c, or the invert portion 21a and the inclined surface portion 21b may be divided.

It should be noted that even if the constituent requirements are included only in the above-described embodiment and the description of each modified example, the constituent requirements may be applied to the embodiment and other modified examples.
The types described above are
This type is used in the coating method of an underground structure that covers an underground structure having a vertical wall and a bottom having a groove forming a flow path from the inside.
It is characterized in that a mold material is provided on the bottom in a molten state, a softened state or a flexible state, a part or all of the shape of the bottom is molded into the mold material, and the mold material is cured to form the mold material. May be good.
The guide sheet explained above is
A guide sheet used in a coating method for an underground structure that covers an underground structure having a vertical wall and a bottom having a groove forming a flow path from the inside.
Using a mold formed by providing a mold material on the bottom in a molten, softened or flexible state, molding a part or all of the shape of the bottom into the mold material, and curing the mold material. It may be characterized by being molded.

11 Bottom coating member 11'Unhardened bottom coating member 11'' Hardened bottom coating member 13 Vertical wall lower coating member 13'Unhardened vertical wall lower coating member 13'' Hardened vertical wall lower coating Member 15 Vertical wall covering member 15'Unhardened vertical wall covering member 15'' Hardened vertical wall covering member 21 Guide sheet 22 Vertical wall guide sheet 4 Packer 5 Sewage basin 501 Inner peripheral surface 51 Bottom mass 511 Invert 512 Inclination Surface 521 Lower lump 521b Lower end 522 Middle lump 523 Upper lump 6 Drainage pipe 7 Mounting pipe 9 type 91 Type Surface B1 Water-reactivated resin powder granules B2 Water-curable resin powder granules B3 Thermosetting resin powder granules B4 Thermal Curable resin powder granules B5 Photocurable resin powder granules SH1 Thermosetting resin sheet SH2 Shape memory resin sheet SH3 Hydroplastic resin sheet SH4 Hydrophilic fiber sheet W Urethane foam

Claims (8)

A method of covering an underground structure having a vertical wall and a bottom having a groove forming a flow path from the inside.
A molding process in which a mold material is provided on the bottom in a molten state, a softened state, or a flexible state, and a part or all of the shape of the bottom is molded into the mold material.
A mold forming step of curing the mold material to form a mold,
A mold removal process for removing the cured mold from the underground structure,
A guide sheet molding step of molding a guide sheet having a shape that follows the shape of a part or all of the bottom portion using the taken-out mold.
A method for covering an underground structure, which comprises a guide sheet installation step of installing the guide sheet that follows the shape of a part or all of the bottom portion at a position of the shape. The mold material is composed of water-reactivated resin powders and granules made of a synthetic resin containing a water-reactivated adhesive.
In the molding step, the water-reactivated resin powder or granular material is arranged so as to cover a part or all of the bottom portion, and water is applied to the water-reactivated resin powder or granular material to mold the water-reactivated resin powder or granular material as a molten state. The method for coating an underground structure according to claim 1, wherein the process is a process. The mold material is composed of powders and granules to which an adhesive is applied.
The molding step is a step of providing the powder or granular material in a state of covering a part or the whole of the bottom in a state where the adhesive is uncured and molding.
The method for coating an underground structure according to claim 1, wherein the guide sheet molding step is a step of curing the adhesive. The mold material is made of a thermoplastic resin powder or granular material made of a thermoplastic resin.
The molding step is a step of arranging the thermoplastic resin powder or granular material in a state of covering a part or all of the bottom portion and heating the thermoplastic resin powder or granular material to mold the thermoplastic resin powder or granular material as a molten state. The method for covering an underground structure according to claim 1, wherein the method is characterized by the above. The mold material comprises a water-reactivated sheet material made of a synthetic resin containing a water-reactivated adhesive, or a water-reactivated sheet material in which a fiber sheet is impregnated with a synthetic resin containing a water-reactivated adhesive. ,
The method for coating an underground structure according to claim 1, wherein the molding step is a step of applying water to the water reactivated sheet material to mold the water-reactivated sheet material in a softened state or a flexible state. The mold material is made of a thermoplastic sheet material made of a thermoplastic resin or a shape memory resin.
The method for coating an underground structure according to claim 1, wherein the molding step is a step of heating the thermoplastic sheet material to mold it in a softened state. The mold material is made of a hydraulic sheet material in which a fiber sheet is impregnated with a hydraulic resin.
The molding step is a step of installing the hydraulic sheet material in a flexible state on the bottom so as to follow the shape of a part or all of the bottom.
The method for coating an underground structure according to claim 1, wherein the mold forming step is a step of curing the hydraulic resin by applying water to the hydraulic sheet material. The mold material is made of foamed resin.
The method for coating an underground structure according to claim 1, wherein the molding step is a step of spraying the foamed resin onto all or part of the bottom to mold .

Images