JP2018150684A - Construction method of underground structure, and underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of an underground structure which is devised to make it easy to construct a groove of a bottom face into a desired form, and an underground structure with a bottom face which is constructed by the construction method.SOLUTION: A construction method of an underground structure for constructing a bottom face 11 including an invert 11a forming a flow channel in a bottom lump 51 in a sewage basin 5 comprises: a material installing step of providing a bottom face constituent material 1 constituting the bottom face 11 in the bottom lump 51 in a molten state, a softened state or a soft state; and a material curing step of curing the bottom face constituent material 1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an underground structure construction method for constructing a bottom surface provided with a groove for forming a flow path at the bottom of the underground structure, and an underground structure including a bottom surface constructed by the construction method.

  When sewage and sewage from individual residences are discharged into the mains of the ground, underground structures buried in the ground may pass through. This underground structure is called in various ways, such as a sewage tank, a sewage tank, a drainage tank, and a connection tank, but a groove (invert) that forms a flow path is provided on the bottom surface.

  In such underground structures, internal damages such as cracks and breakage may occur due to long-term use and earthquakes. In an underground structure in which damage such as cracks or breakage has occurred inside, the existing bottom surface or existing vertical wall of the underground structure is repaired by covering it with a lining member. Hereinafter, in the underground structure to be repaired, the existing bottom surface before the repair is referred to as the existing bottom surface, the existing vertical wall before the repair is referred to as the existing vertical wall, the bottom surface after the repair and the vertical wall after the repair There is a case to distinguish. Further, in the newly installed underground structure, the bottom surface is constructed by providing a groove on the bottom surface of the foundation of the underground structure.

  Conventionally, as a technique for repairing the existing bottom surface of an underground structure, an uncured coating member impregnated with an uncured resin is laid on the existing bottom surface, and then pressed according to the shape of the existing bottom surface of the underground structure. A technique has been proposed in which an uncured resin is cured while the unfolded covering member is pressed against an existing bottom surface of an underground structure by the expanding body for pressurization by inflating the expandable body (for example, Patent Document 1) reference). In the technique described in Patent Document 1, a guide jig for attaching an expansion body for pressurization is used, and the shape of the groove is not a straight type by changing the planar shape of the guide jig according to the shape of the groove. The point which tries to cope with is also described.

Japanese Patent Laying-Open No. 2015-7339

  Here, since the groove on the bottom surface is constructed according to the situation of the piping at the site where the underground structure is installed, its shape and size etc. differ for each underground structure and may be branched into multiple The shape of the groove varies. However, in the technique described in Patent Document 1, depending on the shape of the groove, the pressurizing expansion body may 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 shape.

  In view of the above circumstances, the present invention provides a construction method for an underground structure that has been devised to facilitate construction of a groove on the bottom surface in a desired form, and an underground structure having a bottom surface constructed by the construction method. With the goal.

The construction method of the underground structure of the present invention that solves the above object is as follows.
It is a construction method of an underground structure in which a bottom surface having a groove that forms a flow path is constructed at the bottom of the underground structure,
The material installation step of providing the bottom surface constituting material constituting the bottom surface on the bottom in a molten state, a softened state or a flexible state,
A material curing step of curing the bottom surface constituent material.

  Here, the bottom surface constituting material may be disposed on the bottom in a molten state, a softened state, or a flexible state, or after being disposed on the bottom, the state may be changed to a molten state, a softened state, or a flexible state. Also good. Moreover, you may implement the said material installation process and the said material hardening process all or part in parallel. Further, the bottom surface may be circular in a plan view or rectangular.

  According to the construction method of an underground structure of the present invention, in the material installation step, the bottom constituent material is provided on the bottom in a molten state, a softened state or a flexible state, and the bottom constituent material is cured in the material curing step. By doing so, it becomes possible to construct the bottom surface provided with the groove of a desired form.

Moreover, in the construction method of the underground structure of the present invention,
The bottom portion has an existing bottom surface with a groove forming a flow path;
The material installation step may be a step of covering all or 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 disposed up to a position above a lower end of a vertical wall erected from the existing bottom surface.

  This construction method is mainly a method of repairing the existing bottom surface.

Furthermore, in the construction method of the underground structure of the present invention,
The bottom surface constituent material is made of a thermoplastic resin granular material made of a thermoplastic resin,
The material installation step is a step of placing the thermoplastic resin particles in a state of covering all or a part of the existing bottom surface and heating the thermoplastic resin particles to a molten state. Also good.

  Here, the thermoplastic resin particles include particles such as pellets and chips, granules such as beads and granules, and various powders, and the particle size is not limited.

  If the thermoplastic resin particles are used as the bottom surface constituent material, the thermoplastic resin particles may be disposed in a state of covering all or a part of the existing bottom surface. It becomes easier to handle.

Moreover, in the construction method of the underground structure of the present invention,
The bottom surface constituting material consists of a granular material provided with an adhesive,
The material installation step is a step of covering all or part of the existing bottom surface with the granular material in which the adhesive is in a molten state,
The material curing step may be a step of curing the adhesive.

  Here, the adhesive may be a thermosetting adhesive, a photocurable adhesive, or a water curable adhesive. The adhesive may be coated on the granular material before the granular material is placed in a state of covering all or part of the existing bottom surface, or may cover all or part of the existing bottom surface. You may give to this granular material in the state. Further, the bottom surface constituting material is made of a powder body provided with a water-curable adhesive, and in the material installation step, before the powder body is disposed on all or a part of the existing bottom surface, You may apply | coat or spread water to all or one part of the existing bottom face. Moreover, the granular material includes particles such as pellets and chips, granules such as beads and granules, and various powders, and the particle size is not limited.

  If the granular material provided with an adhesive is used for the bottom surface constituent material, the material curing step is completed by curing the adhesive, and the working efficiency can be improved.

Furthermore, in the construction method of the underground structure of the present invention,
The bottom surface 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 disposed on the existing bottom surface to be in a softened state. There may be.

Moreover, in the construction method of the underground structure of the present invention,
The bottom 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, before the material installation step, by applying or spraying water to all or a part of the existing bottom surface, adopting a mode in which the material installation step and the material curing step are performed in parallel. May be.

Furthermore, in the construction method of the underground structure of the present invention,
The bottom portion has a planar base bottom surface;
The bottom surface constituent material is made of a thermoplastic resin granular material made of a thermoplastic resin,
The material installation step is a step of placing the thermoplastic resin particles in a state of covering the base bottom surface and heating the thermoplastic resin particles to a molten state,
You may have the groove | channel formation process which forms a groove | channel in the said bottom face constituent material provided in the said base bottom face by the said material installation process.

  Here, the material installation step and the groove formation step may be performed in whole or in part. The groove forming step and the material curing step may be performed in whole or in part.

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

Moreover, in the construction method of the underground structure of the present invention,
The bottom portion has a planar base bottom surface;
The bottom surface constituting material consists of a granular material provided with an adhesive,
The material installation step is a step of covering the base bottom surface with the granular material in which the adhesive is in a molten state,
The material curing step is a step of curing the adhesive;
You may have the groove | channel formation process which forms a groove | channel in the said bottom face constituent material provided in the said base bottom face by the said material installation process.

  Here, the groove forming step and the material curing step may be performed in whole or in part, or the material curing step may be performed after the groove forming step is performed. Further, the adhesive may be a thermosetting adhesive, a photocurable adhesive, or a water curable adhesive. Furthermore, the adhesive may be coated on the granular material before being placed in a state of covering the basic bottom surface, or may be applied to the granular material in a state of covering the basic bottom surface.

  This construction method is also mainly used when newly installing an underground structure having a bottom surface with a groove.

The underground structure of the present invention that solves the above object is
An underground structure having a bottom surface with a groove forming a flow path,
The said bottom face is constructed by the construction method for an underground structure according to any one of claims 1 to 8.

  ADVANTAGE OF THE INVENTION According to this invention, the construction method of the underground structure by which the device which makes it easy to construct the groove | channel of a bottom face in a desired form, and the underground structure provided with the bottom face constructed by the construction method can be provided. .

It is a figure which shows an example of the sewage tank before implementing the construction method of this invention. It is a schematic diagram which shows a mode that the existing bottom face of the sewage tank shown in FIG. 1 is coat | covered with bottom face constituent material. It is a schematic diagram which shows a mode that the coating | coated member covers the internal peripheral surface of the sewage tank shown in FIG. It is a schematic diagram which shows the mode of a material installation process and a material hardening process in a 1st modification in steps. It is a schematic diagram which shows the mode of a material installation process and a material hardening process in a 2nd modification in steps. It is a schematic diagram which shows the mode of a material installation process and a material hardening process in a 3rd modification in steps. It is a schematic diagram which shows a mode that constructs the bottom face of a sewage basin in 2nd Embodiment. It is a schematic diagram which shows a mode that the bottom surface of a sewage basin is constructed in the modification of 2nd Embodiment shown in FIG.

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

  First, an underground structure that is an object of the construction method of the underground structure of the present invention will be described. An underground structure here is one that has a groove (invert) that forms a channel on the bottom, and is called variously, such as a sewage basin, a sewage basin, a drainage basin, and a connection basin. However, in the following description, a sewage tank is taken as an example.

  FIG. 1 is a diagram showing an example of a sewage basin before the construction method of the present invention is implemented, with the left side of the figure being upstream and the right side being downstream.

  Fig.1 (a) is sectional drawing of a sewage tank. In the sewage tank 5 shown in FIG. 1A, three side blocks 521 to 523 are stacked on the bottom block 51. Hereinafter, among the three side chunks, the lower side chunk may be referred to as the lower chunk 521, the upper side chunk may be referred to as the upper chunk 523, and the middle side chunk may be referred to as the middle chunk 522. In addition, a deformed block 53 is placed on the upper block 523. Further, an edge lump 54 is placed on the deformed lump 53, and this edge lump 54 functions as a frame body that supports the lid body 55 of the sewage tank 5. The bottom block 51, the three side blocks 521 to 523, the deformed block 53, and the edge block 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 lumps 521 to 523, the deformed lumps 53, and the edge lumps 54 are all cylindrical (cylindrical), and an inner peripheral surface 501 is formed. This inner peripheral surface 501 corresponds to an example of an existing vertical wall. The three side blocks 521 to 523, the deformed block 53, and the edge block 54 may all be square ribs. That is, the vertical wall is not limited to a curved surface but may be a flat surface.

  FIG.1 (b) is the figure (plan view) which looked at the bottom lump shown to the figure (a) from right above.

  The bottom lump 51 corresponds to an example of the bottom, and the upper surface of the bottom lump 51 shown in FIG. 1B corresponds to an example of an existing bottom surface. The existing bottom surface 511 is provided with an existing groove for forming a flow path (hereinafter referred to as an existing invert 511a). In FIG. 1B, the existing invert 511a extending in a straight line from the upstream side to the downstream side is indicated by a solid line in a circular arc shape. The invert has a U-shaped cross-section, and may have a curved or bent portion in plan view as in the existing invert 511a ′ indicated by a one-dot chain line in FIG. There are various aspects such as an aspect having a branching portion such as an existing invert 511a ″ indicated by a chain line. A drain 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. In addition, in the existing invert 511a ″ having a branch portion, the attachment pipe 7 is also attached to the downstream side of the branch portion. As described above, the invert forms are various, but in the following, in order to simplify the explanation and the drawings, the cross-sectional shape shown by a solid line in FIG. An example in which the existing invert 511a is provided on the existing bottom surface 511 will be described. The bottom lump 51 is provided with an existing inclined surface 511b that is gradually inclined downward from the lower end 521b of the lower lump 521 shown in FIG. 1A toward the opening edge of the existing invert 511a.

  FIG. 2 is a schematic diagram showing step by step how the existing bottom surface of the sewage basin shown in FIG. The embodiment shown in FIG. 2 is the first embodiment for repairing the existing bottom surface.

  FIG. 2A and FIG. 2B show an example of the material installation process. In the material installation process, first, a plug or the like is installed to stop the upstream drain pipe 6 (see FIG. 1), and then, as shown in FIG. Cover the existing bottom surface 511. In the present embodiment, the thermoplastic resin particle B1 is used as the bottom constituent material 1, and the thermoplastic resin particle B1 is also disposed up to a position above the lower end 521b of the lower lump 521 by a predetermined height. ing.

  The thermoplastic resin particle B1 of the present embodiment is a spherical bead having a particle size of about 1 mm to several mm, or about several tens of mm, and is manufactured by molding a thermoplastic resin such as polyethylene. The thermoplastic resin particle B1 is not limited to beads, but may be pellets, chips, granules, or the like, and may be a powder having an average particle diameter of about several tens to several hundreds of micrometers.

  Next, as shown in FIG. 2 (b), the hot air is blown from the hot air fan F to heat the thermoplastic resin particles B1 to bring the thermoplastic resin particles B1 into a molten state. Thereby, the material installation process which provides the bottom surface constituent material 1 in the existing bottom surface 511 in a molten state is completed. In addition, after laying particles such as beads on the existing bottom surface 511 of the bottom lump 51, as shown by a one-dot chain line in FIG. 2A, a hot melt adhesive is applied to the laid particles from above. You may spend it.

  It is left as it is, or it blows and cools with a fan etc., and the bottom surface constituent material 1 is hardened as shown in FIG.2 (c) (material hardening process). As a result, portions of the existing bottom surface 511 and the inner peripheral surface 501 up to a position higher than the lower end 521b of the lower lump 521 by a predetermined height are covered with the cured bottom surface constituent material 1 '. Further, on the surface of the cured bottom surface constituent material 1 ′, there are 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 predetermined height above the lower end 521 b of the lower lump 521. Is formed. The bottom surface 11 includes 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. Note that the rising surface 12 is not necessarily required, and can be constituted by only the bottom surface 11.

  According to the construction method of the first embodiment, since the thermoplastic resin particle B1 is adopted as the bottom constituent material 1, regardless of the form of the existing invert 511a of the existing bottom face 511, the bottom face having the invert 11a of a desired form. 11 can be easily constructed.

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

  As shown in FIG. 3 (d), a packer 4, which is a pressurized expansion body, is installed in the sewage tank 5. The packer 4 includes 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. 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 of the compressed air supply pipe 46 is an upper plate 44, and the other end is between the frame 42 and the rubber sleeve 43. Connected. Further, heated air is supplied to the space S in the frame 42 from the ground side. A central opening 441 is provided in the upper plate 44, and the central opening 441 is an opening connected to the space S. In FIG. 3D, the packer 4 is directly placed 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 through this cushion material. It is good also as an aspect mounted.

  In FIG. 3 (d), the packer 4 is already installed in the sewage tank 5, but before installing the packer 4 in the sewage tank 5, the uncured covering member 2 is put on the rubber sleeve 43 of the packer 4 on the ground. Wrap. The uncured covering member 2 of the present embodiment is obtained by impregnating a glass mat with an epoxy resin of a thermosetting resin. When winding the uncured covering member 2, the ends of the uncured covering member 2 are overlapped with each other, and the position is adjusted so that the lower end portion of the uncured covering member 2 reaches the lower plate 45 of the packer 4. To do.

  When the packer 4 is installed in the sewage tank 5, supply of compressed air to the compressed air supply pipe 46 is started. As a result, the rubber sleeve 43 of the packer 4 starts to expand in the radial direction. As the rubber sleeve 43 expands, the uncured covering member 2 that has been wound around the rubber sleeve 43 reduces the amount of overlap between end portions and expands in diameter.

  Next, supply of heated air from the central opening 441 of the upper plate 44 to the space S is started. The heated 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 heated air.

  In FIG. 3 (e), the rubber sleeve 43 of the packer 4 is sufficiently expanded, 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 tank 5 with a predetermined pressure. It is pressed. Further, the lower end portion of the uncured covering member 2 covers the rising surface 12 of the cured bottom surface constituting material 1 ′.

  As described above, 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 heating air is continuously supplied to the space S of 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 while being pressed against the inner peripheral surface 501 of the sewage tub 5. After a predetermined time has elapsed, the supply of compressed air and heated air to the packer 4 is stopped, and the rubber sleeve 43 is contracted by releasing the pressure in the space between the frame 42 and the rubber sleeve 43. Then, the packer 4 is pulled up to the ground.

  FIG.3 (f) is a figure which shows the cross section of the sewage basin in which repair of the existing bottom face and an inner peripheral surface (existing vertical wall) was completed.

  FIG. 3 (f) shows a cured bottom constituent material 1 ′ and a cured coating member 2 ′ obtained by curing an uncured resin impregnated in the uncured coating member 2. 3 (f), the portion circled by a thin dashed line is the joint between the cured coating member 2 ′ and the cured bottom surface constituent material 1 ′, and the lower end portion of the cured coating member 2 ′ is the cured bottom surface constituent material. It covers the 1 'rising surface 12. For this reason, even if it is a joint, the internal peripheral surface 501 of the sewage tank 5 is not exposed.

  Next, modifications 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 of the first embodiment shown in FIG. The components having the same names as those of the names will be described with the reference numerals used so far, and redundant descriptions may be omitted.

  FIG. 4 is a schematic diagram showing step by step the material installation process and the material curing process in the first modification.

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

  As shown in FIG. 4A, the thermosetting granular material B2 covers the existing bottom surface 511 and the inner peripheral surface 501 so as to cover a portion up to a position higher than the lower end 521b of the lower lump 521 by a predetermined height. (Material installation process) In addition, as shown with the dashed-dotted line of Fig.4 (a) with respect to the granular material spread | laid on the existing bottom face 511 etc., you may apply | coat a thermosetting adhesive of a molten state from upper direction.

  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 portions of the existing bottom surface 511 and the inner peripheral surface 501 up to a position above the lower end 521b of the lower lump 521 by a predetermined height are cured bottom surface constituent materials. 1 'covered.

  In this modification, instead of the thermosetting powder B2, a photocurable powder B3 coated with an epoxy resin-based or acrylic resin-based photocurable adhesive may be used. Furthermore, a melted photocurable adhesive may be applied from above to the powder particles spread on the existing bottom surface 511 or the like, as indicated by a one-dot chain line in FIG. When the photocurable granular material B3 is used for the bottom constituent material 1, as shown in FIG. 4 (b), the light curable granular material B3 is irradiated with ultraviolet rays or the like from the light R, and the photocurable granular material is irradiated. A material hardening process is implemented by hardening the photocurable adhesive agent which has coated the body B3.

  Further, instead of the thermosetting granular material B2, a water curable granular material B4 coated with a water curable adhesive such as a water curable polyurethane resin may be used. When the water curable granular material B4 is used for the bottom constituent material 1, water is supplied from the hose H to the water curable granular material B4 as shown in FIG. A material hardening process is implemented by hardening the water-curable adhesive which has coated the granule B4. In addition, after spraying or applying water to the existing bottom surface 511 or the like, the granular material is spread on the existing bottom surface 511 or the like, and the spread granular material is in a molten state as shown by a one-dot chain line in FIG. A water-curable adhesive may be applied from above. In the case of this aspect, the material installation step and the material curing step are performed in parallel.

  FIG. 5 is a schematic diagram showing step by step the material installation process and the material curing process in the second modification.

  In the second modification, a thermoplastic resin sheet SH1 made of a thermoplastic resin such as polyvinyl chloride is used as the bottom surface constituting material 1.

  First, as shown in FIG. 5A, the thermoplastic resin sheet SH1 is disposed on the existing bottom surface 511. Here, the thermoplastic resin sheet SH1 is of a size that can cover up to a position higher than the lower end 521b of the lower lump 521 by a predetermined height.

  Then, as shown in FIG. 5A, by blowing hot air from the hot air fan F to make the thermoplastic resin sheet SH1 in a softened state, as shown in FIG. 5B, the thermoplastic resin sheet SH1 is It closely adheres 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 lump 521 (material installation step). If the thermoplastic resin sheet SH1 does not sufficiently adhere to the existing bottom surface 511 or the like, as shown in FIG. 5B, the thermoplastic resin sheet SH1 is pressed against the existing bottom surface 511 or the like using a pressing rod 81 or the like. May be.

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

  FIG. 6 is a schematic diagram showing step by step the material installation process and the material curing process in the third modification.

  In the third modification, 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 employed as the bottom surface constituent material 1.

  In the same manner as the second modification shown in FIG. 5, as shown in FIG. 6A, a flexible hydraulic fiber sheet SH2 is disposed on the existing bottom surface 511. And as shown in FIG.6 (b), hydraulic fiber sheet SH2 is used for the existing invert 511a of the existing bottom face 511, the existing inclined surface 511b, and the lower end 521b side part of the lower lump 521 using the pressing rod 81 grade | etc.,. Press (material installation process).

  Next, as shown in FIG. 6C, 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 perform a material curing step.

  In addition, after spraying water on the existing bottom face 511 etc., you may arrange | position hydraulic fiber sheet SH2. According to this aspect, the water sprayed in advance and the hydraulic fiber sheet SH2 are impregnated 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 cured hydraulic resin reacts to cure.

  Drawing 7 is a mimetic diagram showing gradually signs that a bottom of a sewage basin is constructed in a 2nd embodiment. This 2nd Embodiment is a method of constructing the bottom face of the newly installed sewage basin.

  As shown to Fig.7 (a), the bottom lump 51 of the sewage tank 5 in 2nd Embodiment has the planar base bottom face 512. As shown in FIG. In the second embodiment, a mold member 9 that forms a desired bottom surface having an invert or an inclined surface is prepared. The mold member 9 includes a mold body 91 having a mold surface 911 corresponding to a desired shape of the bottom surface, and an operation rod 92 attached to the mold body 91. The mold body 91 of the present embodiment has at least the mold surface 911 made of a material having high thermal conductivity such as metal.

  First, the bottom constituent material 1 is disposed on the base bottom surface 512. In the second embodiment, the same thermoplastic resin granules B1 as in the first embodiment shown in FIG. 2 are used as the bottom constituent material 1, and a sufficient amount of thermoplastic resin granules to form a desired bottom surface. The body B1 is filled on the bottom side of the sewage tank 5. Specifically, in consideration of the height position of the bottom surface to be constructed, the bottom of the sewage basin 5 is filled with the thermoplastic resin particle B1 up to a position higher than the lower end 521b of the lower lump 521 by a predetermined height. . In other words, in the second embodiment, the height of the bottom surface to be applied can be adjusted not only by applying the bottom surface in a desired form but also by the amount of the thermoplastic resin particles B1 to be filled.

  Then, hot air is blown from the hot air fan F to heat the thermoplastic resin particles B1 and melt the thermoplastic resin particles B1. Thereby, the material installation process which covers the base bottom face 512 with the thermoplastic resin granular material B1 made into the molten state is completed. In addition, after filling the granular material such as beads on the bottom side of the sewage tub 5, as shown by the one-dot chain line in FIG. 7A, a hot melt adhesive is applied to the filled granular material from above. You may spend 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 (molten thermoplastic resin particle 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. Thereby, 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 and the bottom surface constituent material 1 is cured (groove forming step and material curing step).

  After a predetermined curing time has elapsed, the operating rod 92 is operated to take out the mold member 9 from the sewage basin 5 as shown by the arrow in FIG. According to this embodiment, when newly installing the sewage basin 5, it is possible to easily construct the desired form of the bottom surface 11 including the invert 11a and the inclined surface 11b.

  In addition, although a fine hole etc. may arise in hardened bottom face constituent material 1 ', since the sand and fine dust which have flowed are clogged, a problem does not usually arise. However, if necessary, the bottom surface 11 formed of the cured bottom surface constituent material 1 ′ may be covered with a film, a sheet, or the like.

  FIG. 8 is a schematic diagram showing step by step how to construct the bottom surface of the sewage basin in the modification of the second embodiment shown in FIG.

  As shown in FIG. 8 (a), the mold member 9 of this modification is a hollow one in which the mold body 91 is formed with a predetermined thickness, and the back side of the mold surface 911 corresponding to the desired bottom surface configuration. Has a back surface 912. Moreover, in this modification, the same thermosetting granular material B2 as the 1st modification of 1st Embodiment shown in FIG. 4 is used as the bottom face constituent material 1, and sufficient quantity to comprise a desired bottom face Is filled on the bottom side of the sewage basin 5. In addition, after filling granular materials, such as beads, on the bottom side of the sewage tub 5, as shown by the one-dot chain line in FIG. 8 (a), a thermosetting adhesive is applied to the filled granular materials from above. You may spend it. Thereby, the material installation process which covers the base bottom face 512 with the thermosetting granular material B2 of a molten state is completed.

  Next, the operating rod 92 is operated, and the mold surface 911 of the mold member 9 is pressed against the thermosetting powder B2 as shown in FIG. 8B, 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. Thereby, the surface side part of thermosetting granular material B2 is heated in a state following the mold surface 911, and the thermosetting adhesive coating the thermosetting granular material B2 is cured (groove forming step). And material curing step). The thermosetting powder B2 may be heated by supplying hot water into the mold main body 91 in a state where the mold surface 911 is pressed against the thermosetting powder B2, or the mold surface 911 on the ground. The heated mold surface 911 may be pressed against the thermosetting granular material B2. Further, a heating means for heating the mold surface 911 may be provided on the mold body 91. And after predetermined curing time passes, the operation rod 92 is operated and the type | mold member 9 is taken out from the sewage tank 5 as shown by the arrow of FIG.7 (c).

  In this modification, it may replace with thermosetting granular material B2 and may use photocurable granular material B3 demonstrated using FIG. When using the photocurable granular material B3 as the bottom constituent material 1, the mold body 91 is made of a material having high light transmittance. Examples of highly light-transmitting materials include polytetrafluoroethylene, polyethylene, polypropylene, methacrylic resin, epoxy resin, alicyclic polyimide resin, polyamide resin, polyvinyl chloride, polyvinyl alcohol resin (absorbing ultraviolet rays to be irradiated) And the like which do not contain additives such as ultraviolet absorbers and plasticizers). Then, with the mold surface 911 of the mold member 9 pressed against the photocurable powder B3 as shown in FIG. The groove forming step and the material curing step are performed by curing the photocurable adhesive coating the granules.

  Further, instead of the thermosetting powder B2, the water curable powder B4 described with reference to FIG. When the water-curable granular material B4 is used as the bottom constituent material 1, for example, a mold member including a water-permeable mold body 91 made of porous ceramics, a metal plate having a large number of small holes, or the like. 9 is prepared. Then, as shown in FIG. 8B, in a state where the mold surface 911 of the mold member 9 is pressed against the water curable powder B4, water is supplied from the back surface 912 side of the mold member 9 with the hose H, The groove forming process and the material curing process are performed by curing the water-curable adhesive that coats the body.

  The present invention is not limited to the embodiments described above, and various modifications can be made within the scope described in the claims. For example, in the embodiment described above, the construction object is a sewage basin, but the present invention can be widely applied to any underground structure provided with a groove forming a channel on the bottom surface. Moreover, in the said 1st Embodiment, although the bottom face 11 and the standing surface 12 were integrally formed by hardened bottom face constituent material 1 ', the bottom face 11 and the standing surface 12 may be divided | segmented and formed, 11 may be divided into an invert 11a and an inclined surface 11b. Furthermore, only the invert 11a may be constructed by the construction method of the first embodiment, and the inclined surface 11b may be constructed by a conventional construction method. 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, 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.

  In addition, even if it is the structural requirement contained only in each description of each embodiment and each modification demonstrated above, you may apply the structural requirement to another embodiment and another modification.

DESCRIPTION OF SYMBOLS 1 Bottom surface material 1 'Hardened bottom surface material 11 Bottom surface 11a Invert 11b Inclined surface 12 Standing upper surface 51 Bottom lump 511 Existing bottom surface 511a Existing invert surface 511b Existing inclined surface 521 Lower lump 521b Lower end 9 Mold member 911 Mold surface 91 Mold surface B1 Heat Plastic resin granules B2 Thermosetting powder B3 Photocurable powder B4 Water curable powder SH1 Thermoplastic resin sheet SH2 Hydraulic fiber sheet

Claims (9)

It is a construction method of an underground structure in which a bottom surface having a groove that forms a flow path is constructed at the bottom of the underground structure,
The material installation step of providing the bottom surface constituting material constituting the bottom surface on the bottom in a molten state, a softened state or a flexible state,
And a material curing step for curing the bottom surface constituent material. The bottom portion has an existing bottom surface with a groove forming a flow path;
The construction of an underground structure according to claim 1, wherein the material installation step is a step of covering all or part of the existing bottom surface with the bottom surface constituent material in a molten state, a softened state or a flexible state. Method. The bottom surface constituent material is made of a thermoplastic resin granular material made of a thermoplastic resin,
The material installation step is a step of placing the thermoplastic resin particles in a state of covering all or a part of the existing bottom surface and heating the thermoplastic resin particles to a molten state. The construction method of the underground structure of Claim 2 characterized by these. The bottom surface constituting material consists of a granular material provided with an adhesive,
The material installation step is a step of covering all or part of the existing bottom surface with the granular material in which the adhesive is in a molten state,
The construction method for an underground structure according to claim 2, wherein the material curing step is a step of curing the adhesive. The bottom surface 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 disposed on the existing bottom surface to be in a softened state. The construction method of an underground structure according to claim 2, wherein The bottom 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 construction method for an underground structure according to claim 2, wherein the material curing step is a step of curing the hydraulic resin by applying water to the hydraulic sheet material. The bottom portion has a planar base bottom surface;
The bottom surface constituent material is made of a thermoplastic resin granular material made of a thermoplastic resin,
The material installation step is a step of placing the thermoplastic resin particles in a state of covering the base bottom surface and heating the thermoplastic resin particles to a molten state,
2. The construction method of an underground structure according to claim 1, further comprising a groove forming step of forming a groove in the bottom surface constituent material provided on the base bottom surface by the material installation step. The bottom portion has a planar base bottom surface;
The bottom surface constituting material consists of a granular material provided with an adhesive,
The material installation step is a step of covering the base bottom surface with the granular material in which the adhesive is in a molten state,
The material curing step is a step of curing the adhesive;
2. The construction method of an underground structure according to claim 1, further comprising a groove forming step of forming a groove in the bottom surface constituent material provided on the base bottom surface by the material installation step. An underground structure having a bottom surface with a groove forming a flow path,
9. The underground structure according to claim 1, wherein the bottom surface is constructed by the underground structure construction method according to any one of claims 1 to 8.