JP6973771B2 - Construction method of underground structure - Google Patents

Description

The present invention, on the bottom of the underground structures, about the construction how the underground construction for applying a bottom provided with a groove for forming a flow path.

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 on the bottom surface thereof.

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 existing bottom surface and existing vertical walls of the underground structure with lining members. Hereinafter, in the underground structure to be repaired, the existing bottom surface before repair is referred to as an existing bottom surface, and the existing vertical wall before repair is referred to as an existing vertical wall, and the bottom surface after repair and the vertical wall after repair are referred to. Sometimes we make a distinction. Further, in the newly installed underground structure, the bottom surface is constructed by providing a groove in the bottom surface of the foundation of the underground structure.

Conventionally, as a technique for repairing an existing bottom surface of an underground structure, an uncured covering member impregnated with an uncured resin is laid on the existing bottom surface, etc., and then pressurized according to the shape of the existing bottom surface, etc. of the underground structure. A technique has been proposed in which an uncured resin is cured while the uncured covering member is pressed against an existing bottom surface or the like of an underground structure by inflating the expander (for example, Patent Document 1 and the like). reference). 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. It also describes the points to be dealt with.

Japanese Unexamined Patent Publication No. 2015-7339

Here, since the groove on the bottom is constructed according to the situation of the piping at the site where the underground structure is installed, the shape and size of the groove may differ depending on the underground structure and may be branched into a plurality of branches. Etc., the form of the groove varies. However, in the technique described in Patent Document 1, depending on the form of the groove, the pressurized expander does not expand into a shape corresponding to the groove, and it may be difficult to construct the groove on the bottom surface in a desired form.

In view of the above circumstances, and an object thereof is to provide a construction how underground structures devised to facilitate construction the groove of the bottom surface into a desired form has been made.

The construction method of the underground structure of the present invention that solves the above object is
It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
Possess a material curing step of curing the bottom construction material,
The bottom portion has an existing bottom surface provided with a groove forming a flow path.
The bottom constituent material is made of a thermoplastic resin powder or granular material made of a thermoplastic resin.
The material installation step is a step of arranging the thermoplastic resin powder or granular material in a state of covering all or a part of the existing bottom surface and heating the thermoplastic resin powder or granular material to bring it into a molten state. It is characterized by.

Here, the thermoplastic resin powder granules include 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 thermoplastic resin powder or granular material is used as the bottom surface constituent material, the thermoplastic resin powder or granular material may be arranged so as to cover all or part of the existing bottom surface, so that the groove can be formed in various forms. Correspondence becomes easier.

In addition, the construction method of the underground structure of the present invention that solves the above object is
It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
It has a material curing step of curing the bottom constituent material.
The bottom portion has an existing bottom surface provided with a groove forming a flow path.
The bottom constituent material is composed of powders and granules to which an adhesive is applied.
The material installation step is a step of covering all or a part of the existing bottom surface with the powder or granular material in which the adhesive is in a molten state.
Serial material curing step, wherein the step der Rukoto curing the adhesive.

Here, the adhesive may be a thermosetting type, a photo-curing type, or a water-curing type adhesive. Further, the adhesive may coat the powder or granular material before arranging the powder or granular material in a state of covering all or a part of the existing bottom surface, or may cover all or a part of the existing bottom surface. It may be applied to the powder or granular material in a state of being. Further, the bottom surface constituent material is composed of powder or granular material to which a water-curable adhesive is applied, and in the material installation step, the powder or granular material is said to be before being arranged on all or a part of the existing bottom surface. Water may be applied or sprayed on all or part of the existing bottom surface. Further, the powder or granular material 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 powder or granular material to which the adhesive is applied is used as the bottom surface constituent material, the material curing step can be completed by curing the adhesive, and the work efficiency can be improved.

Further, the construction method of the underground structure of the present invention that solves the above object is
It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
It has a material curing step of curing the bottom constituent material.
The bottom portion has a flat foundation bottom surface.
The bottom constituent material is made of a thermoplastic resin powder or granular material made of a thermoplastic resin.
The material installation step is a step of arranging the thermoplastic resin powder or granular material in a state of covering the bottom surface of the foundation and heating the thermoplastic resin powder or granular material to bring it into a molten state.
Characterized in that it have a groove forming step of forming a groove in the bottom surface construction material provided on said foundation bottom by the material placing step.

Here, the material setting step and the groove forming step may be carried out in whole or in part in parallel. Further, the groove forming step and the material hardening step may be carried out in whole or in part in parallel.

This construction method is mainly used when a new underground structure having a bottom surface with a groove is installed.

In addition, the construction method of the underground structure of the present invention that solves the above object is
It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
It has a material curing step of curing the bottom constituent material.
The bottom portion has a flat foundation bottom surface.
The bottom constituent material is composed of powders and granules to which an adhesive is applied.
The material installation step is a step of covering the bottom surface of the foundation with the powder or granular material in which the adhesive is in a molten state.
The material curing step is a step of curing the adhesive.
Characterized in that it have a groove forming step of forming a groove in the bottom surface construction material provided on said foundation bottom by the material placing step.

Here, the groove forming step and the material curing step may be carried out in whole or in part in parallel, or the material hardening step may be carried out after the groove forming step is carried out. Further, the adhesive may be a thermosetting type, a photocuring type or a water curing type adhesive. Further, the adhesive may be coated on the powder or granular material before being placed in a state of covering the bottom surface of the foundation, or may be applied to the powder or granular material in a state of covering the bottom surface of the foundation.

This construction method is also mainly used when a new underground structure having a bottom surface with a groove is installed.

The underground structure of the present invention that solves the above object is
An underground structure having a bottom surface with grooves forming a flow path.
It is characterized in that the bottom surface is constructed by the construction method of the underground structure according to any one of claims 1 to 4.

According to the present invention, it is possible to provide a construction how underground structures devised to facilitate construction the groove of the bottom surface into a desired form has been made.

It is a figure which shows an example of the sewage basin before carrying out the construction method of this invention. It is a schematic diagram which shows the state of covering the existing bottom surface of the sewage basin shown in FIG. 1 with the bottom surface constituent material step by step. It is a schematic diagram which shows the state of covering the inner peripheral surface of the sewage basin shown in FIG. 1 with a covering member step by step. It is a schematic diagram which shows the state of the material setting process and the material hardening process step by step in the 1st modification. It is a schematic diagram which shows the state of the material setting process and the material hardening process step by step in the 2nd modification. It is a schematic diagram which shows the state of the material setting process and the material hardening process step by step in the 3rd modification. It is a schematic diagram which shows the state of constructing the bottom surface of the sewage basin stepwise in 2nd Embodiment. It is a schematic diagram which shows the state of constructing the bottom surface of the sewage basin step by step in the modification of the 2nd Embodiment shown in FIG. 7.

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

First, the underground structure that is the target of the construction method of 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 on the bottom surface, 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 before the construction method of the present invention is carried out, 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. 1 (a), three side lumps 521 to 523 are stacked on the bottom lump 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 for supporting 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 each is connected. 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 an existing vertical wall. The three side masses 521 to 523, the deformed mass 53, and the edge mass 54 may all constitute a square box (square tube). That is, the vertical wall is not limited to a curved surface and 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 corresponds to an example of the bottom portion, and the upper surface of the bottom mass 51 shown in FIG. 1B corresponds to an example of the existing bottom surface. The existing bottom surface 511 is provided with an existing groove (hereinafter, referred to as an existing invert 511a) forming a flow path. In FIG. 1B, the existing invert 511a 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 as in the existing invert 511a'shown by the alternate long and short dash line in FIG. 1 (b), and further, two points. There are various modes such as the existing invert 511a'' shown by the chain line, which has a branch portion. A drainage pipe 6 is connected to the upstream side of the existing invert 511a, and a mounting pipe 7 is attached to the downstream side of the existing invert 511a. Further, in the existing invert 511a ″ having the branch portion, the mounting pipe 7 is also attached to the downstream side of the branch portion. As described above, there are various forms of invert, but in the following, in order to simplify the explanation and drawings, the cross-sectional shape shown by the solid line in FIG. 1 (b) is arcuate and extends in a straight line in a plan view. An embodiment in which the existing invert 511a is provided on the existing bottom surface 511 will be described as an example. The bottom mass 51 is provided with an existing inclined surface 511b that is gradually inclined downward from the lower end 521b of the lower mass 521 shown in FIG. 1A toward the opening edge of the existing invert 511a.

FIG. 2 is a schematic view stepwise showing how the existing bottom surface of the sewage basin shown in FIG. 1 is covered with the bottom surface constituent material. The embodiment shown in FIG. 2 is the first embodiment for repairing the existing bottom surface.

2 (a) and 2 (b) show an example of the material installation process. In the material installation process, first, a plug or the like is installed to stop water in the drainage pipe 6 (see FIG. 1) on the upstream side, and then, as shown in FIG. Spread it so that it covers the existing bottom surface 511. In the present embodiment, the thermoplastic resin powder or granular material B1 is used as the bottom surface constituent material 1, and the thermoplastic resin powder or granular material B1 is also arranged at a position above the lower end 521b of the lower mass 521 by a predetermined height. ing.

The thermoplastic resin powder or granular material B1 of the present embodiment is spherical beads having a particle size of about 1 mm to several mm or several tens of mm, and is manufactured by molding a thermoplastic resin such as polyethylene. The thermoplastic 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.

Next, as shown in FIG. 2B, the thermoplastic resin powder or granular material B1 is heated by blowing hot air from the hot air fan F to bring the thermoplastic resin powder or granular material B1 into a molten state. This completes the material installation process in which the bottom surface constituent material 1 is provided on the existing bottom surface 511 in a molten state. After the powder or granular material such as beads is spread on the existing bottom surface 511 or the like of the bottom mass 51, a hot melt adhesive is applied to the spread powder or granular material from above as shown by the alternate long and short dash line in FIG. 2 (a). You may call it.

The bottom constituent material 1 is cured as shown in FIG. 2 (c) by leaving it as it is or by blowing air from a fan or the like to cool it (material curing step). As a result, the portion of the existing bottom surface 511 and the inner peripheral surface 501 up to a position above the lower end 521b of the lower mass 521 by a predetermined height is covered with the cured bottom surface constituent material 1'. Further, on the surface of the cured bottom surface constituent material 1', a bottom surface 11 having a shape corresponding to the existing bottom surface 511 and a rising surface 12 corresponding to a portion up to a position above a predetermined height from the lower end 521b of the lower mass 521 are provided. It is formed. The bottom surface 11 has an invert 11a corresponding to the existing invert 511a of the existing bottom surface 511 and an inclined surface 11b corresponding to the existing inclined surface 511b of the existing bottom surface 511. The rising surface 12 is not always necessary, and may be composed of only the bottom surface 11.

According to the construction method of the first embodiment, since the thermoplastic resin powder or granular material B1 is adopted as the bottom surface constituent material 1, the bottom surface provided with the desired form of the invert 11a regardless of the form of the existing invert 511a of the existing bottom surface 511. 11 can be easily constructed.

FIG. 3 is a schematic view showing stepwise how the inner peripheral surface of the sewage basin shown in FIG. 1 is covered with a covering member. This step corresponds to an example of a step of repairing an existing vertical wall.

As shown in FIG. 3D, 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 central opening 441 is an opening connected to the space S. In FIG. 3D, the packer 4 is placed directly on the bottom surface 11, but a cushion material is provided below the lower plate 45 of the packer 4, and the packer 4 is placed on the bottom surface 11 via the cushion material. It may be a mode in which it is placed.

In FIG. 3D, the packer 4 is already installed in the sewage basin 5, but before the packer 4 is installed in the sewage basin 5, the uncured covering member 2 is attached to the rubber sleeve 43 of the packer 4 on the ground. Wrap it. The uncured coating member 2 of the present embodiment is a glass mat impregnated with a thermosetting epoxy resin. When winding the uncured coated member 2, the ends of the uncured coated member 2 are overlapped with each other, and the position is adjusted so that the lower end portion of the uncured coated member 2 reaches around the lower plate 45 of the packer 4. do.

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 covering member 2 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 is about 40 ° C. to 70 ° C. when reaching the space S. The frame 42 is heated by the supplied heating air.

In FIG. 3 (e), the rubber sleeve 43 of the packer 4 is sufficiently inflated, and the uncured covering member 2 is applied to the inner peripheral surface 501 from the lower lump 521 to the upper lump 523 of the sewage basin 5 at a predetermined pressure. It is being pressed. Further, the lower end portion of the uncured coated member 2 covers the rising surface 12 of the cured bottom surface constituent material 1'.

In this way, 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 covering member 2 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. After a lapse of a predetermined time, the supply of compressed air and heated 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 shrink the rubber sleeve 43. Then, the packer 4 is pulled up to the ground.

FIG. 3 (f) is a diagram showing a cross section of a sewage basin in which repair of an existing bottom surface and an inner peripheral surface (existing vertical wall) has been completed.

FIG. 3 (f) shows a cured bottom surface constituent material 1'and a cured coating member 2'in which the uncured resin impregnated in the uncured coating member 2 is cured. Further, the portion circled by the thin alternate long and short dash line in FIG. 3 (f) is the joint between the cured coating member 2'and the cured bottom component 1', and the lower end portion of the cured coating member 2'is the cured bottom component. It covers the rising surface 12 of 1'. Therefore, the inner peripheral surface 501 of the sewage basin 5 is not exposed even at the joint.

Next, a modification of the material installation process and the material curing process shown in FIG. 2 will be described. In the modification described below, the second embodiment described later, and the modification thereof, the differences from the first embodiment shown in FIG. 2 will be mainly described, and the components in the first embodiment shown in FIG. 2 will be described. The components having the same name as the name may be described with the reference numerals used so far, and duplicate explanations may be omitted.

FIG. 4 is a schematic diagram stepwise showing the state of the material installation process and the material curing process in the first modification.

In the first modification, as the bottom surface constituent material 1, a thermosetting powder / granular material B2 in which an epoxy resin-based or acrylic resin-based thermosetting adhesive is coated on the powder / granular material is adopted.

As shown in FIG. 4A, the thermosetting powder or granular material B2 covers the existing bottom surface 511 and the inner peripheral surface 501 up to a position above the lower end 521b of the lower mass 521 by a predetermined height. (Material installation process). As shown by the alternate long and short dash line in FIG. 4A, the melted thermosetting adhesive may be applied to the powder or granular material spread on the existing bottom surface 511 or the like from above.

Next, as shown in FIG. 4B, the thermosetting powder B2 is heated by blowing hot air from the hot air fan F, and the thermosetting adhesive coating the thermosetting powder B2 is applied. Curing (material curing process). By doing so, as shown in FIG. 4C, the portion of the existing bottom surface 511 and the inner peripheral surface 501 up to a position above the lower end 521b of the lower mass 521 by a predetermined height is the cured bottom surface constituent material. Covered by 1'.

In this modification, instead of the thermosetting powder / granular material B2, a photocurable powder / granular material B3 coated with an epoxy resin-based or acrylic resin-based photocurable adhesive may be used. Further, as shown by the alternate long and short dash line in FIG. 4A, the photocurable adhesive in a molten state may be applied to the powder or granular material spread on the existing bottom surface 511 or the like from above. When the photocurable powder or granular material B3 is used as the bottom surface constituent material 1, as shown in FIG. 4B, the photocurable powder or granular material B3 is irradiated with ultraviolet rays or the like from the light R, and the photocurable powder or granular material B3 is irradiated with ultraviolet rays or the like. The material curing step is carried out by curing the photocurable adhesive coating the body B3.

Further, instead of the thermosetting powder or granular material B2, a water-curable powder or granular material B4 coated with a water-curable adhesive such as a water-curable polyurethane resin may be used. When the water-curable powder or granular material B4 is used as the bottom surface constituent material 1, water is supplied from the hose H to the water-curable powder or granular material B4 as shown in FIG. 4 (b) to supply water to the water-curable powder or granular material B4. The material curing step is carried out by curing the water-curable adhesive coating the granular material B4. After water is sprayed or applied to the existing bottom surface 511 or the like, the powder or granular material is spread on the existing bottom surface 511 or the like, and the spread powder or granular material is in a molten state as shown by the alternate long and short dash line in FIG. 4 (a). A water-curable adhesive may be applied from above. In the case of this aspect, the material installation step and the material hardening step are carried out in parallel.

FIG. 5 is a schematic diagram stepwise showing the state of the material installation process and the material curing process 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 bottom surface constituent material 1.

First, as shown in FIG. 5A, the thermoplastic resin sheet SH1 is arranged on the existing bottom surface 511. Here, a thermoplastic resin sheet SH1 having a size capable of covering up to a position above a predetermined height from the lower end 521b of the lower mass 521 is used.

Then, as shown in FIG. 5A, hot air is blown from the hot air fan F to soften the thermoplastic resin sheet SH1, and as shown in FIG. 5B, the thermoplastic resin sheet SH1 is formed. It adheres to the existing invert 511a of the existing bottom surface 511, the existing inclined surface 511b, and the lower end 521b side portion of the lower mass 521 (material installation step). If the thermoplastic resin sheet SH1 does not sufficiently adhere to the existing bottom surface 511 or the like, the thermoplastic resin sheet SH1 is pressed against the existing bottom surface 511 or the like using a pressing rod 81 or the like as shown in FIG. 5 (b). You may.

The thermoplastic resin sheet SH1 is cured by leaving it as it is or by blowing air from a fan or the like (material curing step). By doing so, as shown in FIG. 5C, the portion of the existing bottom surface 511 and the inner peripheral surface 501 up to a position above the lower end 521b of the lower mass 521 by a predetermined height is the cured bottom surface constituent material. Covered by 1'.

FIG. 6 is a schematic diagram stepwise showing the state of the material installation process and the material curing process in the third modification.

In the third modification, as the bottom surface constituent material 1, a hydraulic fiber sheet SH2 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.

As shown in FIG. 6A, the hydraulic fiber sheet SH2 in a flexible state is arranged on the existing bottom surface 511 in the same manner as in the second modification shown in FIG. Then, as shown in FIG. 6B, the hydraulic fiber sheet SH2 is attached to the existing invert 511a and the existing inclined surface 511b of the existing bottom surface 511 and the lower end 521b side portion of the lower mass 521 by using the pressing rod 81 or the like. Press (material installation process).

Next, as shown in FIG. 6 (c), water is supplied from the hose H to the hydraulic fiber sheet SH2, and the hydraulic resin impregnated in the hydraulic fiber sheet SH2 is cured to carry out a material curing step.

The hydraulic fiber sheet SH2 may be arranged after spraying water on the existing bottom surface 511 or the like. According to this aspect, by pressing the hydraulic fiber sheet SH2 against the existing bottom surface 511 or the like using the pressing rod 81 or the like shown in FIG. 6B, the water sprayed in advance and the hydraulic fiber sheet SH2 are impregnated. The hydraulic resin that has been made reacts and curing proceeds.

FIG. 7 is a schematic view showing stepwise how the bottom surface of the sewage basin is constructed in the second embodiment. The second embodiment is a method of constructing the bottom surface of a newly installed sewage basin.

As shown in FIG. 7A, the bottom mass 51 of the sewage basin 5 in the second embodiment has a flat foundation bottom surface 512. Further, in the second embodiment, a mold member 9 having an invert, an inclined surface, or the like and forming a desired bottom surface is prepared. The mold member 9 includes a mold body 91 having a mold surface 911 corresponding to a desired bottom surface shape, and an operation rod 92 attached to the mold body 91. At least the mold surface 911 of the mold body 91 of the present embodiment is made of a material having high thermal conductivity such as metal.

First, the bottom surface constituent material 1 is placed on the bottom surface 512 of the foundation. In the second embodiment, the same thermoplastic resin powder or granular material B1 as in the first embodiment shown in FIG. 2 is used as the bottom surface constituent material 1, and a sufficient amount of the thermoplastic resin powder or granular material is used to form the desired bottom surface. Body B1 is filled in the bottom side of the sewage basin 5. Specifically, in consideration of the height position of the bottom surface to be constructed, the bottom side of the sewage basin 5 is filled with the thermoplastic resin powder granules B1 up to a position above the lower end 521b of the lower lump 521 by a predetermined height. .. In other words, in the second embodiment, not only the bottom surface is constructed in a desired form, but also the height position of the bottom surface to be constructed can be adjusted by the amount of the thermoplastic resin powder or granular material B1 to be filled.

Then, hot air is blown from the hot air fan F to heat the thermoplastic resin powder or granular material B1 and melt the thermoplastic resin powder or granular material B1. This completes the material installation step of covering the bottom surface 512 of the foundation with the thermoplastic resin powder granules B1 in the molten state. After filling the bottom side of the sewage basin 5 with powder or granular material such as beads, a hot melt adhesive is applied to the filled powder or granular material from above as shown by the alternate long and short dash line in FIG. 7 (a). You may call it.

Next, the operation rod 92 is operated to press the mold surface 911 of the mold member 9 against the bottom surface constituent material 1 (melted thermoplastic resin powder or granular material B1). FIG. 7B shows a state in which the mold surface 911 of the mold member 9 is pressed against the bottom surface constituent material 1. As a result, the surface side portion of the bottom surface constituent material 1 follows the mold surface 911, and is further cooled by contact with the mold surface 911 to cure the bottom surface constituent material 1 (groove forming step and material hardening step).

After the predetermined curing time has elapsed, the operation rod 92 is operated to remove the mold member 9 from the sewage basin 5 as shown by the arrow in FIG. 7 (c). According to the present embodiment, when a new sewage basin 5 is installed, a bottom surface 11 having an invert 11a, an inclined surface 11b, and the like can be easily constructed.

In addition, although fine holes and the like may be generated in the cured bottom surface constituent material 1', there is usually no problem because the sand and fine dust in the flowing sewage are clogged. However, if necessary, the bottom surface 11 made of the cured bottom surface constituent material 1'may be covered with a film, a sheet, or the like.

FIG. 8 is a schematic view showing stepwise how the bottom surface of the sewage basin is constructed in the modified example of the second embodiment shown in FIG. 7.

As shown in FIG. 8A, the mold member 9 of this modified example is a hollow one in which the mold body 91 is formed to have a predetermined wall thickness, and is the back side of the mold surface 911 corresponding to the desired bottom surface shape. Has a back surface 912. Further, in this modification, the same thermosetting powder or granular material B2 as in the first modification of the first embodiment shown in FIG. 4 is used as the bottom surface constituent material 1, and the amount is sufficient to form a desired bottom surface. The thermosetting powder and granular material B2 of the above is filled in the bottom side of the sewage basin 5. After filling the bottom side of the sewage basin 5 with powder or granular material such as beads, as shown by the alternate long and short dash line in FIG. 8A, a thermosetting adhesive is applied to the filled powder or granular material from above. You may call it. This completes the material installation step of covering the bottom surface 512 of the foundation with the thermosetting powder or granular material B2 in the molten state.

Next, the operation rod 92 is operated to press the mold surface 911 of the mold member 9 against the thermosetting powder or granular material B2 as shown in FIG. 8 (b), and in this state, the hot air fan from the back surface 912 side of the mold member 9. The mold body 91 is heated by blowing hot air with F. As a result, the surface side portion of the thermosetting powder / granule B2 is heated in a state of imitating the mold surface 911, and the thermosetting adhesive coating the thermosetting powder / granule B2 is cured (groove forming step). And material curing process). The thermosetting powder / granule B2 may be heated by supplying hot water into the mold body 91 while the mold surface 911 is pressed against the thermosetting powder / granule B2, or the mold surface 911 may be heated on the ground. May be heated and the heated mold surface 911 may be pressed against the thermosetting powder / granule B2. Further, the mold body 91 may be provided with a heating means for heating the mold surface 911. Then, after the predetermined curing time has elapsed, the operation rod 92 is operated to take out the mold member 9 from the sewage basin 5 as shown by the arrow in FIG. 7 (c).

In this modification, instead of the thermosetting powder or granular material B2, the photocurable powder or granular material B3 described with reference to FIG. 4 may be used as the bottom surface constituent material 1. When the photocurable powder or granular material B3 is used as the bottom surface constituent material 1, the mold body 91 is made of a material having high light transmission. Examples of the material having high light transmission include polytetrafluoroethylene, polyethylene, polypropylene, methacrylic resin, epoxy resin, alicyclic polyimide resin, polyamide resin, polyvinyl chloride, polyvinyl alcohol resin and the like (absorbing ultraviolet rays to be irradiated). Those that do not contain additives such as UV absorbers and plasticizers). Then, as shown in FIG. 8B, with the mold surface 911 of the mold member 9 pressed against the photocurable powder / granular material B3, ultraviolet rays or the like are irradiated from the back surface 912 side of the mold member 9 with a light R to obtain powder. The groove forming step and the material hardening step are carried out by curing the photocurable adhesive coating the granules.

Further, instead of the thermosetting powder or granular material B2, the water-curable powder or granular material B4 described with reference to FIG. 4 may be used as the bottom surface constituent material 1. When the water-curable powder or granular material B4 is used as the bottom surface constituent material 1, for example, a mold member provided with a water-permeable mold body 91 made of porous ceramics, a metal plate having a large number of small pores, or the like. Prepare 9. Then, as shown in FIG. 8B, with the mold surface 911 of the mold member 9 pressed against the water-curable powder or granular material B4, water is supplied from the back surface 912 side of the mold member 9 by the hose H, and the powder or granular material is supplied. A groove forming step and a material hardening step are carried out by curing the water-curable adhesive coating the body.

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 having a groove forming a flow path on the bottom surface. Further, in the first embodiment, the bottom surface 11 and the rising surface 12 are integrally formed by the cured bottom surface constituent material 1', but the bottom surface 11 and the rising surface 12 may be formed separately, or the bottom surface may be formed separately. 11 may be divided into an invert 11a and an inclined surface 11b to be formed. Further, only the invert 11a may be constructed by the construction method of the first embodiment, and the inclined surface 11b may be constructed by the conventional construction method. Further, also in the second embodiment, a mold member corresponding to the invert 11a and a mold member corresponding to the inclined surface 11b may be prepared respectively, and the invert 11a and the inclined surface 11b may be constructed with the respective mold members. , Only the invert 11a may be constructed by the construction method of the present invention, and the inclined surface 11b may be constructed by the conventional construction method.

It should be noted that even if the constituent requirements are included only in the description of each embodiment and each modified example described above, the constituent requirements may be applied to other embodiments or other modified examples.
The construction method of the underground structure explained above is
It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
It may be characterized by having a material curing step of curing the bottom surface constituent material.
Here, the bottom surface constituent material may be arranged in the bottom portion in a molten state, a softened state or a flexible state, or after being arranged in the bottom portion, the bottom surface constituent material is changed to a molten state, a softened state or a flexible state. May be good. Further, the material installation step and the material curing step may be carried out in whole or in part in parallel. Further, the bottom surface may be circular or rectangular in a plan view.
According to the construction method of this underground structure, the bottom surface constituent material is provided on the bottom portion in a molten state, a softened state or a flexible state in the material installation step, and the bottom surface constituent material is cured in the material curing step. This makes it possible to construct the bottom surface having the groove in a desired form.
In addition, in the construction method of this underground structure,
The bottom portion has an existing bottom surface provided with a groove forming a flow path.
The material installation step may be a step of covering all or a part of the existing bottom surface with the bottom surface constituent material in a molten state, a softened state, or a flexible state.
Here, in the material installation step, the bottom surface constituent material may be arranged from the existing bottom surface to a position above the lower end of the vertical wall erected.
This construction method is mainly a method of repairing the existing bottom surface.
Furthermore, in the construction method of this underground structure,
The bottom constituent material is made of a thermoplastic resin sheet made of a thermoplastic resin.
The material installation step is a step of providing the thermoplastic resin sheet so as to follow the shape of all or a part of the existing bottom surface by heating the thermoplastic resin sheet arranged on the existing bottom surface to make it in a softened state. There may be.
In addition, in the construction method of this underground structure,
The bottom surface constituent material is a hydraulic sheet material in which a fiber sheet is impregnated with a hydraulic resin.
The material installation step is a step of installing the hydraulic sheet material in a flexible state on the existing bottom surface so as to follow the shape of all or part of the existing bottom surface.
The material curing 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. Further, by applying or spraying water on all or part of the existing bottom surface before the material installation process, the material installation process and the material curing process are carried out in parallel. You may.

1 Bottom component 1'Hardened bottom component 11 Bottom 11a Invert 11b Inclined surface 12 Elevating surface 51 Bottom mass 511 Existing bottom surface 511a Existing invert 511b Existing inclined surface 521 Lower mass 521b Lower end 9 type member 911 Type surface 91 Type surface B1 Heat Plastic resin powder granules B2 Thermosetting powder granules B3 Photocurable powder granules B4 Water-curable powder granules SH1 Thermoplastic resin sheet SH2 Hydro-curable fiber sheet

Claims (4)

It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
It has a material curing step of curing the bottom constituent material.
The bottom portion has an existing bottom surface provided with a groove forming a flow path.
The bottom constituent material is made of a thermoplastic resin powder or granular material made of a thermoplastic resin.
The material installation step is a step of arranging the thermoplastic resin powder or granular material in a state of covering all or a part of the existing bottom surface and heating the thermoplastic resin powder or granular material to bring it into a molten state. Construction method of underground structure characterized by. It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
It has a material curing step of curing the bottom constituent material.
The bottom portion has an existing bottom surface provided with a groove forming a flow path.
The bottom constituent material is composed of powders and granules to which an adhesive is applied.
The material installation step is a step of covering all or a part of the existing bottom surface with the powder or granular material in which the adhesive is in a molten state.
A method for constructing an underground structure, wherein the material curing step is a step of curing the adhesive. It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
It has a material curing step of curing the bottom constituent material.
The bottom portion has a flat foundation bottom surface.
The bottom constituent material is made of a thermoplastic resin powder or granular material made of a thermoplastic resin.
The material installation step is a step of arranging the thermoplastic resin powder or granular material in a state of covering the bottom surface of the foundation and heating the thermoplastic resin powder or granular material to bring it into a molten state.
A method for constructing an underground structure, which comprises a groove forming step of forming a groove in the bottom surface constituent material provided on the bottom surface of the foundation by the material installation step. It is a construction method of an underground structure in which a bottom surface having a groove forming a flow path is constructed at the bottom of the underground structure.
A material installation process in which the bottom surface constituent material constituting the bottom surface is provided on the bottom surface in a molten state, a softened state, or a flexible state.
It has a material curing step of curing the bottom constituent material.
The bottom portion has a flat foundation bottom surface.
The bottom constituent material is composed of powders and granules to which an adhesive is applied.
The material installation step is a step of covering the bottom surface of the foundation with the powder or granular material in which the adhesive is in a molten state.
The material curing step is a step of curing the adhesive.
A method for constructing an underground structure, which comprises a groove forming step of forming a groove in the bottom surface constituent material provided on the bottom surface of the foundation by the material installation step .

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