Floor repair method and repair device

Abstract

To provide a floor repair method for repairing a sunken floor without replacing the floor. Provided. [Solution] This method of repairing subsidence of a floor constructed on ground 2 includes the steps of forming a floor through hole 13 in the floor subsidence portion 11 formed by subsiding into a cavity 3 generated between the ground and the floor, positioning a receiving member 5 on the ground 2 so as to be located directly below the floor through hole 13, forming an insertion hole 14 around the floor through hole 13, inserting the tips of multiple anchor bolts 45 into the insertion holes 14 so that the rod 41 passes through the floor through hole 13 while abutting the tip of the rod 41 against the receiving member 5 in order to install a repair device 4 for each floor through hole 13, adjusting the fastening position P where the rear end side of the anchor bolt 45 is fastened to the insertion hole 44, pulling up the floor subsidence portion 11 to its position before subsidence, and forming an injection port consisting of a hole penetrating in the thickness direction.

Description

[Technical field]

[0001] The present invention relates to a floor restoration method and apparatus. [Background technology]

[0002] Floors of factories, warehouses, etc. are generally made of cement-based materials such as concrete and mortar. This type of floor is usually formed in a layer (plate) shape with a certain thickness to cover the ground. Such floors are widely used because of their excellent strength and load-bearing capacity.

[0003] However, cavities can form under this type of floor over time. Cavities are mainly formed when vibrations generated by various machines (e.g., machine tools) installed on the floor or moving objects (e.g., forklifts) moving on the floor are transmitted to the ground, causing the ground to loosen and sink. Since these cavities form between the floor and the ground, the floor in the area where the cavity has formed becomes detached from the ground and appears to be floating in mid-air.

[0004] Conventionally, underfloor reinforcement work has been carried out to fill such cavities with hardening resin (foamable resin, etc.) to reinforce the underfloor (for example, Patent Document 1). This underfloor reinforcement work involves forming a through hole in a part of the floor covering the cavity and injecting hardening resin through the through hole, thereby reinforcing the underfloor while filling the cavity with hardening resin. This type of underfloor reinforcement work has been attracting attention in recent years because it does not require replacing the floor, is easy to carry out, and is cost-effective. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7236776 Summary of the Invention [Problem to be solved by the invention]

[0006] Before the cavity formed under the floor could be reinforced, the part of the floor covering the cavity would sink and become concave. With the floor in a sunken state, the above-mentioned underfloor reinforcement work could not be carried out effectively, which caused problems.

[0007] An object of the present invention is to provide a floor repair method for repairing a sunken floor by returning the floor to its pre-sinking position while filling any cavities beneath the floor, and a repair device for use in said floor repair method. [Means for solving the problem]

[0008] The means for solving the above problems are as follows. <1> A floor repair method for repairing subsidence of a floor having a predetermined thickness constructed on the ground, the floor repair method comprising: a floor through-hole forming step of forming one or more floor through-holes penetrating in a thickness direction in a floor subsidence portion formed when a cavity occurs between the ground and the floor and a part of the floor sinks toward the cavity; a receiving member arranging step of arranging a receiving member on the ground so as to be located directly below the floor through-hole; an insertion hole forming step of forming a plurality of insertion holes around the floor through-hole in the floor subsidence portion; and a repair device comprising: a longitudinal rod, a housing portion for housing a rear end side of the rod so as to be capable of extending and retracting, a plate-shaped protruding portion protruding outward from the housing portion, a plurality of insertion holes penetrating the protruding portion in the thickness direction, and a plurality of anchor bolts each of which is inserted into a corresponding one of the insertion holes and each of which can be fastened to a corresponding one of the insertion holes, the repair device being provided for each of the floor through-holes, the rod being inserted into the floor through-hole while abutting a tip of the rod against the receiving member. a lifting step of adjusting a fastening position where the rear end side of the anchor bolt is fastened to the insertion hole so as to make the rod of the repair device stand upright on the receiving member while adjusting the fastening position, and extending the rod to lift the floor subsidence portion to a position before it subsided; an injection port forming step of forming an injection port consisting of a hole penetrating in the thickness direction in the lifted floor subsidence portion; a resin injection step of injecting a hardening resin from the injection port so as to fill the cavity; a removal step of removing the repair device by removing the tips of the anchor bolts from the insertion holes and lifting the rods from the floor through holes after the cavity has been filled with the hardening resin; and a hole filling step of filling the floor through holes, the insertion holes and the injection port with a hardening filler.

[0009] <2> The restoration device includes a plurality of compression coil springs respectively assigned to the plurality of anchor bolts and fitted onto the anchor bolts, and in the restoration device installation step, the tips of the plurality of anchor bolts are inserted into the corresponding insertion holes so that the plurality of compression coil springs are sandwiched between the protruding portion and the floor sinking portion, and in the adjustment step, the fastening position is adjusted while adjusting the compression amount of the compression coil spring sandwiched between the protruding portion and the floor sinking portion, and in the lifting step, the fastening position is adjusted while adjusting the compression amount of the compression coil spring sandwiched between the protruding portion and the floor sinking portion. <1> A floor repair method as described above.

[0010] <3> A repair device for repairing subsidence of a floor having a specified thickness constructed on the ground, comprising: a longitudinal rod; a housing portion for housing the rear end side of the rod so that the rod can extend and retract; a plate-shaped protruding portion protruding outward from the housing portion; a plurality of insertion holes penetrating the protruding portion in the thickness direction; and a plurality of anchor bolts each inserted into a corresponding insertion hole and each having a rear end that can be fastened to the corresponding insertion hole.

[0011] <4> The method includes the steps of: providing a plurality of compression coil springs each assigned to a plurality of anchor bolts and fitted around the anchor bolt; <3> The repair device according to claim 1 . Effect of the Invention

[0012] According to the present invention, it is possible to provide a floor repair method for repairing a sunken floor by returning the floor to its pre-sinking position while filling any cavities beneath the floor, and a repair device for use in the floor repair method. [Brief description of the drawings]

[0013] [Figure 1] An explanatory diagram showing an example of a floor constructed on the ground. [Diagram 2] An explanatory diagram showing a floor subsidence caused by a cavity that occurred between the floor and the ground. [Diagram 3]FIG. 1 is an explanatory diagram showing a floor through-hole forming step provided in a floor repair method according to embodiment 1. [Figure 4] FIG. 13 is an explanatory diagram showing a receiving member arrangement step. [Diagram 5] An explanatory diagram showing the insertion hole forming process [Figure 6] Perspective view of the repair device [Figure 7] An explanatory diagram showing the repair device installation process [Figure 8] An explanatory diagram showing the pulling process [Figure 9] FIG. 1 is an explanatory diagram showing the injection port forming process. [Figure 10] An explanatory diagram showing the resin injection process [Figure 11] An explanatory diagram showing the removal process [Figure 12] An explanatory diagram showing the hole filling process [Figure 13] FIG. 1 is an explanatory diagram showing a floor repair method according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] [Embodiment 1] Hereinafter, a floor repair method according to a first embodiment of the present invention will be described with reference to Figs. 1 to 12. Fig. 1 is an explanatory diagram showing an example of a floor 1 constructed on a ground 2. First, the floor 1 to which the floor repair method of the present embodiment is applied will be briefly described. The floor 1 is a layered (plate-shaped) member having a predetermined thickness and composed mainly (base material) of a cement-based material such as concrete or mortar. Examples of such a floor 1 include a concrete floor and a mortar floor. In addition, reinforcing members such as steel bars may be disposed inside the floor 1. The floor 1 is a floor of a building such as a factory, a warehouse, or a store.

[0015] In other embodiments, the floor repair method of this embodiment may be applied to floors of civil engineering buildings formed on the ground, and road surfaces such as roads and runways, in addition to floors of buildings, as long as the object of the present invention is not impaired. Fig. 1 shows a state in which a floor 1 is constructed directly on a surface 2a of a ground 2. In other embodiments, as long as the object of the present invention is not impaired, another layer (e.g., a crushed stone layer) for the purpose of ground reinforcement, etc. may be formed on the surface 2a of the ground 2.

[0016] As shown in Fig. 1, when floor 1 is constructed on ground 2, no cavity is observed between ground 2 and floor 1. In the following explanation, floor 1 is assumed to be a "concrete floor" having a predetermined thickness (for example, 10 cm to 30 cm).

[0017] 2 is an explanatory diagram showing a floor subsidence part 11 formed due to a cavity 3 occurring between a floor 1 and the ground 2. Over time, the ground 2 under the floor 1 may become loose and sink due to the influence of vibrations from a vibration source (machine tool, forklift, etc.) installed on the floor 1, resulting in a cavity 3 between the ground 2 and the floor 1. When such a cavity 3 is formed, a part of the floor 1 covering the cavity 3 may sink so as to become recessed toward the cavity 3 side (ground 2 side). In this specification, such a part of the floor 1 that has sunk is referred to as a floor subsidence part 11.

[0018] The floor repair method of this embodiment involves lifting and returning the floor subsidence portion 11 to the position before subsidence, and then filling the cavity 3 formed under the floor 1 with a hardened product of a predetermined hardening resin (for example, a foamable resin), thereby repairing the floor 1. In particular, in the floor repair method of this embodiment, a dedicated repair device 4, which will be described later, is used when lifting the floor subsidence portion 11 to the position before subsidence.

[0019] The subsided floor portion 11 that can be repaired by the floor repair method of this embodiment is connected without being separated from the surrounding non-subsided floor portion (hereinafter, "non-subsided floor portion") 12. The subsided floor portion that has been completely separated from the non-subsided floor portion 12 is not eligible for repair by the floor repair method of this embodiment.

[0020] The floor repair method of this embodiment mainly includes a floor through-hole forming step, a receiving member positioning step, an insertion hole forming step, a repair device installation step, an adjustment step, a lifting step, an injection port forming step, a resin injection step, a removal step, and a hole filling step.

[0021] The floor through hole forming step is a step of forming one or more floor through holes 13 penetrating in the thickness direction in the floor subsidence part 11 formed by a cavity 3 occurring between the ground 2 and the floor 1 and a part of the floor 1 sinking toward the cavity 3 side. FIG. 3 is an explanatory diagram showing the floor through hole forming step included in the floor repair method according to the first embodiment. In this floor through hole forming step, a floor through hole 13 having a predetermined hole diameter (for example, a diameter of about 130 mm to 150 mm) penetrating from the upper surface 1a side to the lower surface 1b side of the floor 1 is formed in the floor subsidence part 11 overlapping the cavity 3 in the vertical direction using a drill (for example, a commercially available concrete drill). The hole diameter of the floor through hole 13 is set to a size that allows the rod 41 of the repair device 4 described later to be inserted.

[0022] The number (quantity) of floor through holes 13 provided in the floor subsidence portion 11 is set according to the number of repair devices 4 required to pull up the floor subsidence portion 11 to its position before subsidence, taking into consideration the size (width), shape, thickness, etc. of the floor subsidence portion 11.

[0023] The floor through hole 13 penetrates the floor 1 in the thickness direction (vertical direction) and is connected to the cavity 3. When the floor 1 is viewed in a plan view from the upper surface 1a side, the floor through hole 13 is provided in the floor subsidence part 11 so as to overlap with the cavity 3. As shown in FIG. 3, a plurality of floor through holes 13 are formed in the floor subsidence part 11. The floor through holes 13 are provided, for example, in the deepest part 11a of the floor subsidence part 11 at the center side that is sunk furthest toward the ground 2, and in the inclined part 11b arranged around the deepest part 11a and connecting the deepest part 11a and the floor unsunk part 12. For convenience of explanation, FIG. 3 shows one floor through hole 13 formed in the deepest part 11a of the floor subsidence part 11 and two floor through holes 13 formed in the inclined part 11b of the floor subsidence part 11 that is arranged around the deepest part 11a and has a ring shape in a plan view.

[0024] When multiple floor through holes 13 are formed in the floor subsidence portion 11, the distance between adjacent floor through holes 13 is not particularly limited as long as it is possible to pull the floor subsidence portion 11 up to its pre-subsidence position using the repair device 4 in the pull-up process described below, but it is preferable to set the distance in the range of 1 m to 2 m, for example.

[0025] The receiving member placement step is a step of placing the receiving member 5 on the ground 2 so as to be located directly below the floor through-hole 13. FIG. 4 is an explanatory diagram showing the receiving member placement step. The receiving member 5 is a member that receives a force (load) from the rod 41 of the repair device 4 so that the tip of the rod 41 of the repair device 4 described later does not sink into the ground 2. For example, a metal plate material of a predetermined thickness (for example, a circular iron plate with a thickness of 2 cm) is used as the receiving member 5. At least one such receiving member 5 is assigned to each of the floor through-holes 13 formed in the floor subsidence portion 11. In the receiving member placement step, the receiving member 5 is inserted into the cavity 3 side from the outside (upper surface 1a side) of the floor 1 using the floor through-hole 13. Then, the receiving member 5 inserted into the cavity 3 side is placed on the surface 2a of the ground 2 so as to be located directly below the floor through-hole 13 when the floor 1 is viewed in plan from the upper surface 1a side. The size, material, and other conditions of the receiving member 5 are appropriately set according to the size of the rod 41 of the repair device 4 used, the strength of the force received from the rod 41, and the like.

[0026] In other embodiments, before placing the receiving member 5, a reinforcing member such as wood (square timber, plank, etc.) or crushed stone may be laid on the ground 2 to serve as a base, and the receiving member 5 may then be placed on top of the reinforcing member.

[0027] The insertion hole forming process is a process of forming a plurality of insertion holes 14 around the floor through-hole 13 in the floor sinking portion 11. FIG. 5 is an explanatory diagram showing the insertion hole forming process. The insertion hole 14 is used to insert the tip 45a of the anchor bolt 45 provided in the repair device 4 when the repair device 4 described later is installed in a predetermined position. The insertion hole 14 is usually formed by digging a concave shape from the upper surface 1a side of the floor sinking portion 11 so as not to penetrate the floor sinking portion 11 in the thickness direction. In other words, the insertion hole 14 has a cylindrical shape with a bottom that opens upward. Such an insertion hole 14 is formed using a drill (for example, a commercially available concrete drill) or the like.

[0028] The diameter of the insertion hole 14 is smaller than the diameter of the floor through hole 13. A plurality of insertion holes 14 are provided around one floor through hole 13. In the present embodiment, three insertion holes 14 are assigned to one floor through hole 13, and the insertion holes 14 are provided so as to be located at the vertices of an equilateral triangle around the floor through hole 13 when the floor through hole 13 is viewed in plan from the top surface 1a side. The number of insertion holes 14 provided for one floor through hole 13 corresponds to the number of anchor bolts 45 provided in the repair device 4 described later. In addition, the position where the insertion hole 14 is formed in the floor through hole 13 is set in consideration of the arrangement relationship of the plurality of anchor bolts 45 provided in the repair device 4.

[0029] In the present embodiment, the insertion hole forming step is performed after the above-described receiving member arranging step, but in other embodiments, the insertion hole forming step may be performed before the receiving member arranging step.

[0030] The restoration device installation process is a process in which, in order to install the restoration device 4 for each floor penetration hole 13, the tip 41a of the rod 41 included in the restoration device 4 is abutted against the receiving member 5, and the tip 45a of the multiple anchor bolts 45 included in the restoration device 4 is inserted into the corresponding insertion holes 14 so that the rod 41 passes through the floor penetration hole 13. Here, first, the configuration of the restoration device 4 will be described with reference to FIG. 6 and the like. FIG. 6 is a perspective view of the restoration device 4. The restoration device 4 is a device that applies a so-called single-rod type hydraulic cylinder, and as shown in FIG. 6, mainly includes a rod (piston rod) 41, a storage section 42, a protruding section 43, an insertion hole 44, and an anchor bolt 45.

[0031] The rod 41 is a longitudinal columnar member extending in one direction, and its tip 41a has a flat circular shape. The diameter of the rod 41 is, for example, about 60 mm. The rear end 41b side of the rod 41 is accommodated in the accommodation section 42 so that the tip 41a side is exposed. The accommodation section 42 has a cylindrical appearance as a whole, and accommodates the rear end 41b side of the rod 41 so that it can reciprocate along the longitudinal direction. The accommodation section 42 also includes an oil passage and the like for hydraulically reciprocating (forward and backward) the rod 41 along the longitudinal direction. In this specification, the movement of the rod 41 so that the length of the part exposed from the accommodation section 42 becomes longer is referred to as "forward", and the movement in the opposite direction (i.e., the direction in which the rod 41 moves so that the length of the part exposed from the accommodation section 42 becomes shorter) is referred to as "reverse". When the rod 41 moves forward, the length of the portion of the rod 41 exposed from the storage section 42 is extended. When the rod 41 moves backward, the length of the portion of the rod 41 exposed from the storage section 42 is shortened. The length of the portion of the rod 41 exposed from the storage section 42 is, for example, about 40 cm to 60 cm.

[0032] 6, hydraulic hoses 46 that form part of the hydraulic circuit are connected to the housing 42. Two hydraulic hoses 46 are connected, one for supplying hydraulic oil into the housing 42 and the other for discharging hydraulic oil from the housing 42.

[0033] In this specification, the configuration including the rod 41 and the housing portion 42 may be referred to as the "main body portion 40."

[0034] The overhanging portion 43 is in the form of a plate that overhangs outward in an annular shape from the storage portion 42, which has a cylindrical appearance. In this embodiment, the overhanging portion 43 is made of a metal plate having a predetermined thickness. The overhanging portion 43 is attached to the storage portion 42 so as to be arranged horizontally when the repair device 4 is in use. This overhanging portion 43 is provided with a plurality of insertion holes 44 (see FIG. 7) that penetrate in the thickness direction. The insertion holes 44 are portions to which the rear ends 45b of the anchor bolts 45 are fastened. Each insertion hole 44 is arranged in the overhanging portion 43 so as to surround the storage portion 42.

[0035] The anchor bolts 45 are members that support the main body 40 of the restoration device 4 so that it stands on the floor 1 (floor subsidence portion 11). Each anchor bolt 45 is elongated and has a male thread formed on its outer circumferential surface. The restoration device 4 is equipped with a plurality of anchor bolts 45, each of which is inserted into the corresponding insertion hole 44, and each rear end 45b side is capable of being fastened to the corresponding insertion hole 44.

[0036] The rear end 45b side of the anchor bolt 45 protrudes from the lower surface 43b side to the upper surface 43a side of the overhanging portion 43 through the insertion hole 44, and a washer 47 and a nut 48 are attached to the protruding rear end 45b side. The nut 48, which includes a cylindrical female thread surface inside, is fastened to the upper surface 43a (part surrounding the insertion hole 44) of the overhanging portion 43 via the washer 47, thereby fastening the rear end 45b side of the anchor bolt 45 to the insertion hole 44. Note that by loosening the fastening of the nut 48, the fastening of the rear end 45b side of the anchor bolt 45 to the insertion hole 44 is released. Note that the fastening of the rear end 45b side of the anchor bolt 45 to the insertion hole 44 is performed in an adjustment process following the repair device installation process.

[0037] In the restoration device installation process, in order to install such a restoration device 4 for each floor through-hole 13, the tips 45a of the anchor bolts 45 are inserted into the corresponding insertion holes 14 so that the rod 41 passes through the floor through-hole 13 while the tip 41a of the rod 41 is abutted against the receiving member 5. FIG. 7 is an explanatory diagram showing the restoration device installation process. When installing the restoration device 4, the rod 41 is inserted into the floor through-hole 13 from the tip 41a side. Then, after the tip 41a of the rod 41 is abutted against the receiving member 5 arranged directly below the floor through-hole 13, the tip 45a of each anchor bolt 45 is inserted into the corresponding insertion hole 14 so that the main body 40 is generally erected on the receiving member 5.

[0038] 7, the restoration device 4 of this embodiment includes a plurality of compression coil springs 49 attached by being fitted onto each anchor bolt 45. The compression coil springs 49 are formed by winding a wire in a spiral shape, and for example, a commercially available strong spring can be used as the compression coil spring 49. In the restoration device installation process, the tips 45a of the plurality of anchor bolts 45 are inserted into the corresponding insertion holes 14 so that the plurality of compression coil springs 49 are sandwiched between the protruding portion 43 and the floor sinking portion 11.

[0039] In the repair device installation process, the length of the rod 41 exposed from the storage section 42 is set to be the same for all three repair devices 4. In addition, the height positions of the projections 43 of the repair devices 4 are set to be the same for all three repair devices 4.

[0040] The adjustment process is a process of adjusting the fastening position P at which the rear end 45a side of the anchor bolt 45 is fastened to the insertion hole 44 in order to make the rod 41 of the repair device 4 stand upright on the receiving member 5. In the adjustment process, the fastening position P of the rear end 45b side of each anchor bolt 45 arranged around the main body 40 is adjusted so that the rod 41 of the repair device 4 stands vertically on the surface 2a of the ground 2. In the case of this embodiment, when the rod 41 stands upright, the overhanging portion 43 is arranged horizontally (parallel to the surface of the ground 2). Therefore, in the adjustment process, the fastening position P is adjusted while adjusting the length (height) of each anchor bolt 45 between the upper surface 1a of the floor 1 and the overhanging portion 43 so that the overhanging portion 43 is arranged horizontally.

[0041] In the adjustment process of this embodiment, the fastening position P is adjusted while adjusting the compression amount of the compression coil spring 49 sandwiched between the overhanging portion 43 of the restoration device 4 and the floor sinking portion 11. In this embodiment, the fastening position P is adjusted so that the overhanging portion 43 is horizontally disposed while being supported from below by the compression coil spring 49. At that time, the compression amount of the compression coil spring 49 interposed between the overhanging portion 43 and the floor sinking portion 11 is adjusted. Note that the length, elasticity, and other conditions of the compression coil spring 49 fitted onto each anchor bolt 45 are set as appropriate.

[0042] The lifting process is a process of lifting the floor subsidence part 11 to the position before subsidence by extending the rod 41 while adjusting the fastening position P and maintaining the upright state of the rod 41. FIG. 8 is an explanatory diagram showing the lifting process. In the lifting process, the rod 41 of each restoration device 4 is advanced and extended, so that the floor subsidence part 11 fixed by each anchor bolt 45 is lifted upward. Each restoration device 4 operates approximately simultaneously to advance and extend each rod 41 so that the entire floor subsidence part 11 gradually returns to its original position. At that time, the fastening position P of each restoration device 4 in each restoration device 4 is appropriately adjusted so that the upright state of the rod 41 is maintained.

[0043] For example, when the inclined portion 11b is gradually pulled up, the inclination of the surface gradually becomes gentler, and finally returns to the flat state before sinking. At that time, the fastening position P is appropriately adjusted so that the surface 1a of the inclined portion 11b and the surface of the protruding portion 43 gradually become parallel. In this embodiment, the surface of the deepest portion 11a is generally flat. Therefore, the deepest portion 11a is gradually pulled up while maintaining parallelism with the protruding portion 43.

[0044] In the case of this embodiment, in the lifting process, the fastening position P is adjusted while adjusting the compression amount of the compression coil spring 49 sandwiched between the overhanging portion 43 and the floor sinking portion 11. When such a compression coil spring 49 is provided, in the lifting process, the fastening position P is adjusted so that the overhanging portion 43 is horizontally disposed while being supported from below by the compression coil spring 49. By such a lifting process, the floor sinking portion 11 is returned to the position before sinking.

[0045] The injection port forming step is a step of forming an injection port 15 consisting of a hole penetrating in the thickness direction in the floor subsidence part 11 in the lifted state. FIG. 9 is an explanatory diagram showing the injection port forming step. In this injection port forming step, a drill D is used to form an injection port 15 having a predetermined hole diameter (for example, about 10 mm to 15 mm) penetrating from the upper surface 1a side to the lower surface 1b side of the floor subsidence part 11 in the lifted state. The injection port 15 penetrates the floor subsidence part 11 (floor 1) in the thickness direction and is connected to the cavity 3. A plurality of injection ports 15 are usually provided for the floor subsidence part 11. The position and number of injection ports 15 are appropriately set so that the cavity 3 can be efficiently filled with a hardening resin by the resin injection step described later.

[0046] The resin injection process is a process in which a curable resin R is injected from an injection port 15 so as to fill the cavity 3. Fig. 10 is an explanatory diagram showing the resin injection process. For example, a foamable resin is used as the curable resin R. The foamable resin is liquid in an uncured state, and such uncured foamable resin (curable resin) R expands in volume due to foaming and hardens to become a solid resin (cured product made of foamed resin) R'.

[0047] The foamable resin may be a general one used in this type of method for filling the cavity 3. For example, the foamable resin may be a urethane-based foamable resin composed of a base material and a catalyst. The base material of the urethane-based foamable resin may be, for example, one containing methylene bis(4,1-phenylene)=diisocyanate. The catalyst of the urethane-based foamable resin may be, for example, one containing dimethylmyristylamine. The urethane-based foamable resin is a liquid composition in which the base material and catalyst are mixed at a predetermined ratio. The foamable resin such as the urethane-based foamable resin may contain a solvent, etc., as appropriate.

[0048] In the resin injection step, the curable resin R is supplied, for example, by using a supply device (for example, an electric mini pump, maximum discharge pressure: 1.4 MPa) equipped with a predetermined discharge nozzle N. As shown in FIG. 10, the tip of the elongated discharge nozzle N is inserted into the cavity 3 through the injection port 15, and a predetermined amount of liquid curable resin (foamable resin) R is discharged from the discharge nozzle N in this state. Note that the method of supplying the curable resin R into the cavity 3 is not limited to this, and may be appropriately selected depending on the purpose.

[0049] When the foamable resin (hardening resin) R is supplied using the discharge nozzle N in this manner, the foamable resin R fills the cavity 3 formed between the floor 1 including the floor subsidence portion 11 and the ground 2. As shown in FIG. 10, in the resin injection process, the rod 41 of the restoration device 4 is located below the floor subsidence portion 11 (floor 1), so that the foamable resin (hardening resin) R is supplied around it. In addition, the receiving member 5 is pressed against the ground 2 by the tip 41a of the rod 41, so that the foamable resin (hardening resin) R is also supplied around the receiving member 5.

[0050] After a predetermined amount of the foamable resin R is supplied to the cavity 3, the discharge nozzle N is appropriately removed from the injection port 15. The foamable resin (curable resin) R supplied to the cavity 3 undergoes a chemical reaction accompanied by foaming over time, and hardens while expanding in volume.

[0051] In the resin injection step, when the foamable resin (curable resin) R is supplied from the injection port 15 into the cavity 3, appropriate measures may be taken to prevent the foamable resin R from overflowing from the injection port 15 to the outside (toward the upper surface 1a of the floor 1). For example, when the discharge nozzle N is inserted into the injection port 15 to supply the foamable resin R, the gap between the injection port 15 and the discharge nozzle N may be blocked with an outflow prevention material (not shown) made of a water-retentive sheet (such as a waste paper) of a predetermined size soaked in a liquid such as water, to prevent the foamable resin (curable resin) R from overflowing to the outside from the injection port 15. It is preferable that the outflow prevention material is a water-retentive sheet containing liquid and formed in a ring shape so as to surround the injection port 15.

[0052] In the removal process, after the cavity 3 is filled with the hardening resin R, the tip 45a of the anchor bolt 45 is removed from the insertion hole 14, and the rod 41 is pulled up from the floor through hole 13, thereby removing the repair device 4. FIG. 11 is an explanatory diagram showing the removal process. In the removal process, the rod 41 is pulled outward from the floor through hole 13 while the repair device 4 is operated so as to move backward. The foamable resin (hardening resin) R filled between the floor 1 (bed subsidence portion 11) and the ground 2 has fluidity and expands in volume, so that when the rod 41 is pulled out, the portion is appropriately filled with the foamable resin (hardening resin) R. Note that even after the removal process, the receiving member 5 remains on the ground 2 as it is.

[0053] The hole filling process is a process of filling the floor through hole 13, the insertion hole 14, and the injection port 15 with a hardening filler 6. FIG. 12 is an explanatory diagram showing the hole filling process. In the hole filling process, after the cavity 3 is filled with a foamable resin (hardening resin) R, the floor through hole 13, the insertion hole 14, and the injection port 15 are filled with a hardening filler 6. As the filler 6, for example, a cement-based material such as mortar is used. After the floor through hole 13 is filled with the filler 6, the filler 6 hardens to form a plug 61 that blocks the floor through hole 13. In addition, after the insertion hole 14 is filled with the filler 6, the filler 6 hardens to form a plug 62 that fills the concave insertion hole 14. In addition, after the injection port 15 is filled with the filler 6, the filler 6 hardens to form a plug 63 that blocks the injection port 15. Forming such plugs 61-63 maintains the flatness of the upper surface 1a of the floor 1. Furthermore, forming the plug 61 that closes the floor through-hole 13 and the plug 63 that closes the injection port 15 maintains the airtightness and watertightness of the floor 1. When closing the floor through-hole 13 and the injection port 15, a porous member such as a sponge may be filled in the floor through-hole 13 and the injection port 15 in addition to the hardening filling material 6, as necessary.

[0054] As described above, by going through the floor through-hole forming step, receiving member arranging step, insertion hole forming step, repair device installation step, adjustment step, lifting step, injection port forming step, resin injection step, removal step, and hole filling step provided in the floor repair method of this embodiment, the floor subsidence part 11 can be returned to the position before subsidence while filling the cavity 3 below the floor 1, thereby repairing the floor 1 without replacing the floor 1. This floor repair method is easier to carry out and more cost-effective than replacing the floor 1.

[0055] Furthermore, by using the above-mentioned restoration device 4, the floor restoration method of this embodiment can be carried out efficiently.

[0056] In addition, when the repair device 4 includes the compression coil spring 49 as in this embodiment, it is easier to adjust the fastening position P so that the rod 41 of the repair device 4 stands upright on the receiving member 5 during the adjustment process, and it is easier to adjust the fastening position P so that the rod 41 of the repair device 4 can be maintained in an upright state during the lifting process, compared to when the repair device 4 does not include the compression coil spring 49 (see embodiment 2 described later). In other words, it is easier to maintain the protruding portion 43 of the repair device 4 in a horizontal state when adjusting the fastening position P.

[0057] [Embodiment 2] Next, a floor restoration method according to an embodiment will be described with reference to FIG. 12. In the floor restoration method of this embodiment, a restoration device 4A is used instead of the restoration device 4 used in the first embodiment. Other than that, it is the same as the first embodiment. This restoration device 4A is the restoration device 4 of the first embodiment from which the compression coil spring has been removed. Even if the restoration device 4A does not have a compression coil spring as in this embodiment, in order to make the rod 41 of the restoration device 4A stand upright on the receiving member 5, an adjustment step of adjusting the fastening position P at which the rear end 45b side of the anchor bolt 45 is fastened to the insertion hole 44, and a lifting step of lifting the floor subsidence portion 11 to the position before subsidence by extending the rod 41 while maintaining the upright state of the rod 41 while adjusting the fastening position P can be performed.

[0058] <Other embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments, for example, are also included within the technical scope of the present invention.

[0059] (1) In the above embodiments 1 and 2, the protrusion portion of the repair device was in the form of a plate that protruded outward in a circular ring shape from the storage portion, which had a cylindrical appearance. However, the shape of the protrusion portion is not limited as long as it does not impair the objective of the present invention. For example, the protrusion portion may protrude outward from the storage portion so as to form a polygonal shape such as a quadrilateral (square, rectangle, etc.) when viewed in a plane.

[0060] (2) In the above embodiments 1 and 2, three anchor bolts were provided in the protrusion of one repair device, but the number of anchor bolts provided is not limited as long as it does not impair the objective of the present invention. For example, four (or more than four) anchor bolts may be assigned to one protrusion. [Explanation of symbols]

[0061] Reference Signs List 1...floor, 11...floor subsidence portion, 13...floor penetration hole, 14...insertion hole, 15...injection port, 2...ground, 3...cavity, 4...repair device, 41...rod, 42...accommodation portion, 43...projection portion, 44...insertion hole, 45...anchor bolt, 49...compression coil spring, 5...receiving member, P...fastening position, R...hardening resin

Claims

1. A floor repair method for repairing subsidence of a floor having a predetermined thickness constructed on ground, comprising the steps of: a floor through-hole forming step of forming one or more floor through-holes penetrating in a thickness direction in a floor subsidence portion formed by a part of the floor sinking toward the cavity side due to a cavity occurring between the ground and the floor; A receiving member placement process of placing a receiving member on the ground so as to be located directly below the floor through hole; An insertion hole forming step of forming a plurality of insertion holes around the floor through hole in the floor sinking portion; a repair device installation process for installing a repair device for each of the floor penetration holes, the repair device comprising a longitudinal rod, a storage section for storing the rear end side of the rod so that the rod can extend and retract, a plate-shaped protruding section protruding outward from the storage section, a plurality of insertion holes penetrating the protruding section in a thickness direction, and a plurality of anchor bolts each inserted into a corresponding insertion hole and each having a rear end side capable of being fastened to the corresponding insertion hole, the repair device installation process comprising: a repair device installation process for installing a repair device for each of the floor penetration holes, the repair device installation process being performed by abutting the tip of the rod against the receiving member while inserting the tip of the plurality of anchor bolts into the corresponding insertion holes so as to insert the rod into the floor penetration hole; an adjustment step of adjusting a fastening position where a rear end side of the anchor bolt is fastened to the insertion hole in order to make the rod of the repair device stand upright on the receiving member; a lifting process in which the rod is extended while adjusting the fastening position to maintain the upright state of the rod, thereby lifting the floor subsidence portion to a position before subsidence; an injection port forming step of forming an injection port consisting of a hole penetrating in the thickness direction in the raised bed sinking portion; a resin injection step of injecting a curable resin from the injection port so as to fill the cavity; a removal process of removing the repair device by removing the tip of the anchor bolt from the insertion hole and pulling up the rod from the floor through hole after the cavity is filled with the hardening resin; and a filling step of filling the floor through hole, the insertion hole, and the injection port with a hardening filler material, The repair device includes a plurality of compression coil springs respectively assigned to the plurality of anchor bolts and each of the compression coil springs fitted onto the outer surface of the anchor bolt; In the repair device installation step, the tips of the anchor bolts are inserted into the corresponding insertion holes so that the compression coil springs are sandwiched between the protruding portion and the floor sinking portion, In the adjustment step, the fastening position is adjusted while adjusting the compression amount of the compression coil spring sandwiched between the overhanging portion and the floor sinking portion, A floor repair method in which, during the lifting process, the fastening position is adjusted while adjusting the compression amount of the compression coil spring sandwiched between the protrusion portion and the floor sinking portion.

2. A repair device for repairing subsidence of a floor having a predetermined thickness constructed on ground, comprising: A longitudinal rod; a housing portion that houses a rear end side of the rod so that the rod can extend and retract; A plate-shaped protruding portion protruding outward from the housing portion; A plurality of insertion holes penetrating the protruding portion in a thickness direction; a plurality of anchor bolts each being inserted into a corresponding one of the insertion holes and each having a rear end capable of being fastened to the corresponding one of the insertion holes; a plurality of compression coil springs respectively assigned to the plurality of anchor bolts and each of the compression coil springs fitted onto the outer surface of the anchor bolt.

Images