Repair method

Abstract

To provide a novel repair method capable of filling a space with foam regardless of the environment in the space to be filled with the foam.SOLUTION: The repair method is a method of filling a space with foam, and comprises the steps of placing a shielding material in the space to block water within the space, and forming the foam on the side of the shielding material that is shielded from the water.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a repair method. [Background technology]

[0002] Patent Document 1 discloses a repair method in which a filler material is filled into an underground cavity. In this repair method, a seal is first provided on the wall of the cavity to prevent the filler material from leaking, and then the cavity is filled with a filler material made of synthetic resin.

[0003] Patent Document 2 discloses a repair method in which polyurethane foam is filled into the space underneath a structure. In this repair method, polyurethane foam is foamed and cured in the space underneath surrounded by the existing structure to fill the space underneath. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-261936 A [Patent Document 2] JP 2023-046196 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there has been an increasing demand for repairing aged underground waterways and underground spaces caused by collapses. When filling such spaces with foam, in order to obtain a suitable expansion ratio, it is preferable to foam and harden the foaming material in a state in which the foaming material is isolated from the water in the space.

[0006] An object of the present invention is to provide a new repair method that can fill a space with foam regardless of the environment in the space to be filled with the foam. [Means for solving the problem]

[0007] A repair method according to one embodiment of the present disclosure is a repair method for filling a space with a foam, comprising the steps of: placing a shielding material in the space to block water from the space; and forming the foam on the side of the shielding material that is blocked from the water. Effect of the Invention

[0008] The present disclosure can provide a new repair method that allows foam to be filled regardless of the environment in the space to be filled with the foam. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a space to which a repair method according to an embodiment of the present disclosure is applied; [Diagram 2] FIG. 2 is an explanatory diagram showing a repair method according to the first embodiment of the present disclosure. [Diagram 3] FIG. 1 is a perspective view showing a shielding material according to a first embodiment of the present disclosure. [Figure 4] FIG. 2 is an explanatory diagram showing a repair method according to the first embodiment of the present disclosure. [Diagram 5] FIG. 2 is an explanatory diagram showing a repair method according to the first embodiment of the present disclosure. [Figure 6] FIG. 2 is an explanatory diagram showing a repair method according to the first embodiment of the present disclosure. [Figure 7] FIG. 11 is an explanatory diagram showing a pressing member according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0011] First Embodiment A repair method according to an embodiment of the present disclosure is a method for filling and repairing a space 10 as shown in Fig. 1. The space 10 is a space that is generated by the expansion of a sinkhole or crack that has occurred in a road or an underground waterway. The space 10 in this embodiment is the internal space of a sinkhole that has occurred in the bottom surface 11 of an existing waterway. The space 10 has a wall surface 12 that surrounds the side of the space 10, an opening 13 that opens into the bottom surface 11 of the waterway, and a bottom 14.

[0012] At the bottom 14 of the space 10, there may be cases where the water flowing in from the water channel through the opening 13 and the water leaking from the wall surface 12 of the space 10 stay as the stored water W. Also, the wall surface 12 of the space 10 may have the earth and sand or the ground covering the water channel exposed.

[0013] Next, with reference to FIGS. 2 to 6, a repair method according to the first embodiment of the present disclosure will be described. The repair method includes a step S1 of arranging a shielding material 2 for shielding the stored water W in the space 10, a step S2 of installing a pressing member 6, a step S3 of forming a foam body 4 on the side of the shielding material 2 shielded from the stored water W, and a step S4 of installing a lid portion 8. Note that the order of step S2 and step S3 can be appropriately interchanged according to the internal environment of the space where the repair method is carried out and the type of the pressing member 6.

[0014] As shown in FIG. 2(a), in step S1, the shielding material 2 is arranged in the space 10 to form a foaming space 21. The shielding material 2 shields the stored water W in the space 10 from the foaming space 21. The shielding material 2 divides the space 10 into a foaming space 21 shielded from the stored water W and the other space. The shielding material 2 isolates a part of the space 10 from the stored water W and surrounds the foaming space 21.

[0015] The shielding material 2 only needs to have a strength capable of isolating the foaming space 21 from the stored water W for about several tens of seconds to 1 minute while the foaming raw material for forming the foam body 4 is foaming and curing in step S2 described later. Also, it is preferable to appropriately select a suitable shielding material 2 according to the unevenness of the wall surface 12 of the space 10 and surrounding objects, and it is preferable that the shape can be freely changed (selected).

[0016] Various shapes such as a column shape and a frustum of a cone shape with a part of the shielding material 2 being open can be used. Also, the shielding material 2 may be in a sheet shape.

[0017] Also, the shielding material 2 is formed of a water-resistant synthetic resin. The synthetic resin forming the shielding material 2 can be selected from a thermoplastic resin and a thermosetting resin.

[0018] Thermoplastic resins can be processed into shapes using heat sealing. Examples of thermoplastic resins that can be selected include general-purpose plastics such as polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), acrylonitrile butadiene styrene (ABS resin), acrylonitrile styrene (AS resin), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), and polyethylene terephthalate (PET).

[0019] In particular, examples of thermoplastic resins that have excellent impact resistance include amorphous plastics such as polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), ABS resin (acrylonitrile butadiene styrene), and polycarbonate (PC), as well as polyurethane-based thermoplastic elastomers (TPU), and olefin-based thermoplastic elastomers (TPO), etc.

[0020] As the thermosetting resin, for example, phenol resin, urea resin, melamine resin, alkyd unsaturated polyester, epoxy resin, thermosetting polyurethane resin, diallyl phthalate resin, silicone resin, etc. can be selected.

[0021] Fig. 3 is a perspective view showing the shielding material 2 of this embodiment in an unfolded state. As shown in Fig. 3, the shielding material 2 of this embodiment is a bag body formed by processing a thin film of polyvinyl chloride having water resistance. Therefore, the shape of the shielding material 2 can be easily changed according to the shape of the contents inside the shielding material 2. In addition, the volume of the shielding material 2 in the unfolded state is about 10 liters to 50 liters.

[0022] In step S1, the shielding material 2 in a small folded or unfolded state is carried into the space 10. In this embodiment, as shown in FIG. 2(a), the shielding material 2 passes through the opening 13 in a small folded state, and then is unfolded in the space 10. At this time, the shielding material 2 may be unfolded into a bag-like shape in the space 10, or may be left in the state in which it was carried into the space 10. As a result, the shielding material 2 forms a foaming space 21 on the side of the space 10 that is shielded from the stored water W. The shielding material 2 receives a nozzle 16 for injecting the foaming raw material into the foaming space 21.

[0023] Furthermore, as shown in FIG. 2(b), in step S2, a pressing member 6 is placed.

[0024] The pressing member 6 has a first rod member 61, a second rod member 62, and a connecting portion 63 that connects the first rod member 61 and the second rod member 62. In this embodiment, a case will be described as an example in which one first rod member 61 is provided with three second rod members 62 and three connecting portions 63. However, the number of first rod members 61, second rod members 62, and connecting portions 63 can be changed according to the size and shape of the space 10, the shielding material 2, and the foam 4.

[0025] The first rod member 61 is arranged to span in the horizontal direction (the direction of the arrow X in FIG. 2(b)) above the shielding material 2 and the foaming space 21. Both ends of the first rod member 61 are fixed to the wall surface 12.

[0026] The shielding material 2 may be attached to the first rod member 61 or may be separate from the first rod member 61. A method for fixing the shielding material 2 to the first rod member 61 can be appropriately selected from, for example, adhesion with an adhesive, a method in which a fixing hole is provided in a part of the shielding material 2 and the first rod member 61 is passed through the hole, and the like.

[0027] The first rod member 61 in this embodiment is a single-tube pipe made of metal. However, the first rod member 61 can be a resin or wooden pipe, a reinforcing bar, or a stake. A biasing member (not shown) is provided on both ends of the first rod member 61. The biasing member biases the first rod member 61 against the wall surface 12. This allows the first rod member 61 to be fixed to the wall surface 12 regardless of the shape or condition of the surface of the wall surface 12.

[0028] The second rod member 62 extends from the first rod member 61 toward the foaming space 21. The second rod member 62 in this embodiment extends downward (in the opposite direction to the arrow Z in FIG. 2(b)) from the first rod member 61 via the connecting portion 63. The second rod member 62 includes a first end portion 62a connected to the connecting portion 63 and a second end portion 62b opposite to the first end portion 62a. The second end portion 62b is disposed inside the foaming space 21. In this embodiment, one second rod member 62 is disposed for one shielding material 2 and foaming space 21. The shape and number of the second rod members 62 can be appropriately changed according to the shape and size of the shielding material 2 and the foam 4 (see FIG. 4) formed in the next step S3.

[0029] The second rod member 62 of this embodiment is a single metal pipe, similar to the first rod member 61. Note that the second rod member 62, similar to the first rod member 61, can also be a resin or wooden pipe, a reinforcing bar, or a stake.

[0030] The connecting portion 63 is a joint that connects the first rod member 61 and the second rod member 62. The connecting portion 63 in this embodiment is a T-shaped joint.

[0031] 4(a), in step S3, a foam 4 is formed in the foaming space 21. The foam 4 is, for example, a foamed resin molded body. The foam 4 in this embodiment is a so-called foamed-in-place resin molded body in which liquid foaming raw material is injected from a nozzle 16 into the foaming space 21 in the space 10, mixed, and foamed.

[0032] A foam that is foamed on site (hereinafter referred to as an in-situ foam) can be discharged and molded by spraying. Therefore, the in-situ foam can be freely formed according to the shape of the foaming space 21.

[0033] Examples of the in-situ foam that can be used include formed cement banking (FCB), stabilized light soil (SLS), foamed polyurethane resin, etc. In particular, polyurethane resin is preferred in terms of workability and light weight during construction.

[0034] The foam 4 of this embodiment is a hard polyurethane foam that is foamed in situ by mixing two liquids, a polyol component and a polyisocyanate component. The polyol component is, for example, a polyol having a group that reacts with isocyanate, an amine compound, etc., and further contains a catalyst, a flame retardant, a foaming agent, etc. The foaming agent is not particularly limited, but may be water, carbon dioxide, a hydrocarbon, etc. The use of a polyol that reacts with isocyanate, an amine compound, and water as raw materials is preferable in terms of adhesion to the shielding material 2 that surrounds the foaming space 21.

[0035] The foam 4 is formed by the reaction of the polyol component and isocyanate component of the foaming raw materials in the foaming space 21. Specifically, by mixing the foaming raw materials, a resinification reaction between the polyol and the amine compound and a foaming reaction in which carbon dioxide is generated by the reaction of water and isocyanate occur simultaneously. As a result, polyurethane foam is formed while foaming.

[0036] The density of the foam 4 formed in the foaming space 21 is smaller than that of the stored water W, and is 30 kg / m3 ~70kg / m 3 (JIS A9511). The compressive strength of the foam 4 is about 60 kN / m 2 More than 60kN / m 2 to 200 kN / m 2 (JIS A9511) level. Rigid polyurethane foam has a closed-cell structure, which makes it highly resistant to water penetration and has excellent water resistance.

[0037] The foam 4 is formed inside the foaming space 21 surrounded by the shielding material 2. The foam 4 in this embodiment is formed while expanding to about 30 times its size at the start of foaming during the foam molding process. Accordingly, the shielding material 2 expands and deforms as the foam 4 is formed. As a result, the foam 4 fills the foaming space 21 surrounded by the shielding material 2 without leaving any gaps.

[0038] The shielding material 2 can prevent the stored water W in the space 10 from entering the foaming space 21 and mixing with the foaming raw material of the foam 4. Therefore, the shielding material 2 can prevent the isocyanate component in the foaming raw material from reacting with the stored water W, which is excess moisture, during the formation of the foam 4. This allows the shielding material 2 to stably react with the foaming raw material in the foaming space 21, and ultimately allows the foaming raw material to foam and harden at a desired expansion ratio. As a result, a foam 4 with a desired expansion ratio, density, and compressive strength can be formed in the space 10.

[0039] The foam 4 may be formed by foaming while rolling in the pressing member 6 during the foam molding process. As described above, in this embodiment, the second end 62b of the second rod member 62 is disposed inside the foaming space 21. Therefore, the foam 4 is formed while rolling in the second rod member 62 inside. As a result, the foam 4 becomes integrated with the second rod member 62 and therefore with the pressing member 6.

[0040] As the foaming progresses further, the shielding material 2 and the foam 4 expand while pushing aside the stored water W. As a result, the shielding material 2 and the foam 4 receive a buoyant force Fw (see the black arrow in FIG. 4(a)) from the stored water W and attempt to move upward (in the direction of the arrow Z in FIG. 4(a)). Meanwhile, the pressing member 6 generates a reaction force Fn (see the white arrow in FIG. 4(a)) that attempts to hold back the foam 4 against the buoyant force Fw. As a result, the foam 4 receives a buoyant force Fw from the stored water W, while being pressed by the reaction force Fn from the pressing member 6, and is foamed. The foam 4 is foamed while pushing aside the stored water W via the shielding material 2, and after contacting the bottom 14 of the space 10, it deforms according to the surface shape of the bottom 14 and adheres closely.

[0041] As shown in Fig. 4(b), when the foaming of the foam 4 is completed, the pressing member 6 presses the shielding material 2 and the foam 4 with a reaction force Fn (see the white thick arrow in Fig. 4(b)) against the buoyancy force Fw (see the black thick arrow in Fig. 4(b)) from the stored water W. In this way, the pressing member 6 holds the shielding material 2 and the foam 4 in a predetermined position in the space 10. The shielding material 2 and the foam 4 in this embodiment adhere closely to the bottom 14 of the space 10, and expel the stored water W between the shielding material 2 and the bottom 14.

[0042] It is possible to appropriately switch between step S2 of installing the pressing member 6 and step S3 of forming the foam 4. For example, the shielding material 2 may be installed outside the space 10, and the foam 4 may be formed in the foaming space 21 thereof, and then the foam 4 together with the shielding material 2 may be introduced into the space 10 to install the pressing member 6. Alternatively, the pressing member 6 may be installed in advance in the space 10 (step S2), and then the shielding material 2 may be installed in accordance with the position of the pressing member 6 (step S1), and the foam 4 may be formed in the foaming space 21 of the shielding material 2 (step S3).

[0043] Next, as shown in FIG. 5(a), in this embodiment, foams 401 and 402 are filled into space 10 in addition to foam 4 formed by foaming in the above-mentioned step S3.

[0044] The foam 401 is foamed in the foaming space 211 of the shielding material 201, similarly to the foam 4, while rolling in the second rod member 62 provided in advance. The shielding material 201 and the foam 401 of this embodiment foam while pushing aside the stored water W, similarly to the foam 4. The foam 401 adheres to the bottom 14 of the space 10, the wall surface 12 of the space 10, and the adjacent shielding material 2 and foam 4 via the shielding material 201. As a result, the shielding material 201 and the foam 401 remove the stored water W between the shielding material 201 and the wall surface 12 and the bottom 14.

[0045] Similarly, the foam 402 is foamed in the foaming space 212 of the shielding material 202 while rolling up the second rod member 62 provided in advance inside. The shielding material 202 and the foam 402 of this embodiment also come into close contact with the bottom 14 of the space 10, the wall surface 12 of the space 10, and the adjacent shielding material 2 and foam 4. As a result, the shielding material 202 and the foam 402 eliminate the accumulated water W between the shielding material 202 and the wall surface 12 and the bottom 14.

[0046] 5(b), in this embodiment, foam 403, foam 404, and foam 405 are filled in space 10. Foam 403 is foamed in foaming space 213 of shielding material 203 arranged above foams 4, 401, and 402 (in the direction of arrow Z in FIG. 5(b)). The same is true for foams 404 and 405. When foams 403, 404, and 405 are not subjected to buoyancy F from stored water W, they may be foamed without being pressed by pressing member 6.

[0047] As described above, the stored water W in the space 10 is removed by the foam bodies 4, 401, and 402. Therefore, the foam bodies 403, 404, and 405 can foam without being affected by fluctuations in foaming rate or buoyancy due to the mixing of the stored water W.

[0048] In this manner, in the present embodiment, the formation of the foam 4 is repeated multiple times while appropriately changing or omitting the order of steps S1 to S3. As a result, the space 10 is filled with multiple shielding materials 2 filled with the foam 4.

[0049] Finally, as shown in FIG. 6(a), in step S4, the lid 8 is placed on the opening 13 of the space 10. The lid 8 is provided on the upper part of the shielding materials 2 and the foam 4 to cover them and close the opening 13. The lid 8 in this embodiment is concrete filled above the shielding materials 2 and the foam 4. It is preferable that the upper surface 81 of the lid 8 is flush with the bottom surface 11. Without being limited thereto, the lid 8 may be a metal plate formed to a size that covers the opening 13. The lid 8 may also be formed by compacting cement, lime, earth and sand, etc. Furthermore, the lid 8 may be formed of asphalt or reinforced concrete.

[0050] The lid portion 8 may press the shielding material 2 filled with the foam 4 together with the pressing member 6. This causes the space 10 to be closed, completing the repair of the bottom surface 11 of the existing waterway.

[0051] In this embodiment, the foams 403, 404, and 405 are foamed in the foaming spaces 213, 214, and 215 of the shielding materials 203, 204, and 205, respectively, but the present disclosure is not limited thereto. For example, as shown in FIG. 6(b), the foam 406 may be foamed in the upper part of the foams 4, 401, and 402 without using the shielding material 2. The foam 406 foams in a single space surrounded by the foams 4, 401, and 402 and the wall surface 12 of the space 10, and fills the space 10 at once. In this case, the foam 406 can be foamed without being affected by the fluctuation in foaming rate caused by the mixing of the stored water W or by buoyancy.

[0052] <Second embodiment> Next, the second embodiment of the present disclosure will be described only in terms of differences from the first embodiment. As shown in Fig. 7(a), in step S202 of the second embodiment of the present disclosure, a pressing member 60 is installed inside the shielding material 2 installed in the space 10. The pressing member 60 of this embodiment is a weight for fixing the shielding material 2 and the foam 4 in the space 10, and can be made of, for example, gravel, soil, stone, or the like. However, the pressing member 60 may be formed by pouring concrete, cement, or the like into the lower part of the foaming space 21 and hardening it.

[0053] The pressing member 60 may have any weight that can keep the shielding material 2 and the foam 4 at the bottom 14 of the space 10 against the buoyant force Fw generated when the shielding material 2 and the foam 4 push aside the stored water W. In any case, the pressing member 60 may have any weight that can fix the shielding material 2 and the foam 4 in the space 10 against the buoyant force Fw generated in the shielding material 2 and the foam 4.

[0054] The pressing member 60 of the present embodiment is disposed at the bottom of the shielding material 2. As a result, the shielding material 2 is disposed in contact with the bottom 14 of the space 10 while pushing aside the stored water W.

[0055] Furthermore, as shown in FIG. 7(b), in this embodiment, in step S3, the foam 4 is foamed and formed in the foaming space 21 in which the pressing member 60 is placed.

[0056] The repair method of the present disclosure includes a step S1 of arranging a shielding material 2 and a step S3 of forming a foam 4. The foam 4 is formed on the side of the shielding material 2 that is shielded from the stored water W. This makes it possible to prevent the stored water W from being mixed into the shielding material 2 during the process of forming the foam 4. Therefore, during the process of forming the foam 4, the foaming reaction and the resinification reaction can proceed according to the compounding recipe of the foaming raw material. This makes it possible to form a foam 4 having a desired expansion rate, density, and compressive strength. As a result, the repair method can fill and repair the space 10 with the foam 4 having the desired expansion rate and density, regardless of the presence or absence of the stored water W.

[0057] Furthermore, the repair process of the present disclosure includes a step S2 of installing a pressing member 6 (60) that presses the foam 4. As a result, the shielding material 2 filled with the foam 4 is held at a predetermined position in the space 10 against the buoyancy Fw of the stored water W. This allows the foam 4 to be placed inside the space 10 while reducing gaps. As a result, the repair method allows the space 10 to be sufficiently filled with the foam 4.

[0058] The pressing member 6 may have a first rod member 61 and a second rod member 62 that are suspended across the wall surface 12 of the space 10. The pressing member 60 may also be a weight that fixes the shielding material 2 and the foam 4 within the space 10. This allows the pressing member 6 (60) to press the foam 4 filled in the shielding material 2 at a desired position against the buoyant force Fw.

[0059] Furthermore, the repair method may include a step S4 of installing a lid portion 8 to be placed on the opening 13 of the space 10. In this way, with the space 10 filled with the foam 4, the opening 13 can be closed to block the space 10.

[0060] As described above, the repair method disclosed herein provides a new repair method that can fill a space with foam regardless of the environment within the space into which the foam is filled.

[0061] Although the present disclosure has been described above with reference to the embodiment, the present disclosure is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the invention. In particular, the multiple modifications described in this specification can be arbitrarily combined as necessary.

[0062] For example, in the above embodiment, an example has been described in which the bag-shaped shielding material 2 shields the stored water W, but the present disclosure is not limited thereto. That is, the shielding material 2 may be capable of separating the space 10 into the foamed space 21, which is shielded from the stored water W, and other spaces, and various examples of the form of shielding may be applied. For example, the shielding material 2 may be formed in a water-impermeable film, or a part of the water-impermeable film may be fixed to the wall surface 12 of the space 10 to surround the foamed space 21.

[0063] In the above embodiment, there is stored water W in the space 10 at the time of step S1 where the shielding material 2 is placed in the space 10, but the present disclosure is not limited to this. There may be no stored water W in the space 10 at the time where the shielding material 2 is placed in the space 10. The repair method of the present disclosure is also applicable, for example, to the case where water flows into the space 10 during the steps after step S1, or the case where water flows into the space 10 after completion of all steps S1 to S4.

[0064] In the above embodiment, the shielding material 2 maintains its water-proofing property during and after the formation of the foam 4, but the present disclosure is not limited thereto. As described above, the shielding material 2 prevents the isocyanate component in the foaming raw material from reacting with the stored water W, which is excess moisture, during the formation of the foam 4. To obtain this effect, the shielding material 2 only needs to exhibit water-proofing property at least during the reaction of the foaming raw material, and may lose its water-proofing property after the reaction of the foaming raw material. Causes of loss of water-proofing property include, for example, reaction heat generated by the reaction of the foaming raw material, scratches due to friction between the shielding material 2 and surrounding structures (wall surface 12 or pressing member 6 (60)), and deterioration over time. [Explanation of symbols]

[0065] 10: Space 12: Wall 13: Opening 2: Shielding material 4: Foam 6 (60): Pressing member 61: First rod member 62: Second rod member 8: Lid part S1: Process S2 (S202): Process S3: Process S4: Process

Claims

1. A repair method for filling a space with foam, A step of placing a shielding material inside the space to shield water inside the space; forming the foam on a side of the shielding material that is shielded from the water; A repair method that includes the following:

2. A step of providing a pressing member that presses the foam against the buoyancy of the foam, The repair method according to claim 1 , further comprising:

3. The pressing member is A first rod member that is spanned across a wall surface that surrounds the space; A second rod member extending from the first rod member and fixing the foam body; having The repair method according to claim 2.

4. The pressing member is a weight that fixes the shielding material and the foam inside the space. The repair method according to claim 2.

5. Further comprising a step of installing a lid portion to be placed on an opening of the space. The repair method according to claim 1.

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