Fiber reinforced concrete reinforcement material for hollow columnar object

Abstract

To provide a mechanism to reinforce a hollow columnar object more easily.SOLUTION: A reinforcing member for a hollow columnar object comprises: a hollow columnar bag-like sheet; a push-in rod for inserting the bag-like sheet into the hollow columnar object; an expansive fixing body that is disposed on one end of the bag-like sheet and fixes the bag-like sheet to the inside of the hollow columnar object by expanding; and a connection member to detachably connect the expansive fixing body and a tip of the push-in rod.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The invention disclosed herein relates to hollow columnar fiber reinforced concrete reinforcement. [Background technology]

[0002] For example, a method for reinforcing a hollow columnar object is described in Patent Document 1. Patent Document 1 discloses that "a reinforcing material 1 is pushed up from below with a hollow pipe 4 and placed inside a utility pole 100, and a filler is supplied to the hollow pipe 4, and the filler is injected into the utility pole 100 using the through holes 10 in order from the bottom" (see abstract). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-4546 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the reinforcing method of Patent Document 1, the hollow pipes must be connected within the narrow space of the reinforcing sheet, which makes the work less efficient.

[0005] The present invention provides a mechanism for more simply reinforcing a hollow columnar object. [Means for solving the problem]

[0006] In order to solve the above problems, for example, the configurations described in the claims are adopted. Effect of the Invention

[0007] According to the present disclosure, a mechanism for more simply reinforcing a hollow columnar object is provided. Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram illustrating an insertion step of a method for reinforcing a hollow columnar object according to one embodiment; [Diagram 2] 1 is a schematic diagram illustrating a fixing step of a method for reinforcing a hollow columnar object according to one embodiment; [Diagram 3] 1 is a schematic diagram illustrating a filling step of a method for reinforcing a hollow columnar object according to one embodiment; [Figure 4] 10 is a partial schematic view illustrating in detail a reinforcing member for a hollow columnar object in an insertion step. FIG. [Diagram 5] 10 is a partial schematic view illustrating in detail a reinforcing member for a hollow columnar object in a fixing process. FIG. [Figure 6] 11 is a schematic diagram illustrating an insertion step of a method for reinforcing a hollow columnar object according to another embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the reinforcing method for a hollow columnar object and the reinforcing member for a hollow columnar object according to the present disclosure will be described with reference to the drawings as appropriate. In the present disclosure, a hollow columnar object is reinforced using a reinforcing member for a hollow columnar object. The hollow columnar object is not limited to, but may be, for example, a concrete wiring pole (a concept including telegraph poles, communication poles, etc.), a support pole (a pole for supporting lighting, cameras, nets, etc.), a chimney, or other hollow concrete pole.

[0010] 1 to 3 are schematic diagrams illustrating the inserting step, the fixing step, and the filling step in a method for reinforcing a hollow columnar object 1 using a reinforcing member 20 for a hollow columnar object according to one embodiment. FIG. 4 is a partial schematic diagram showing in detail the reinforcing member 20 for a hollow columnar object in the inserting step. FIG. 5 is a partial schematic diagram showing in detail the reinforcing member 20 for a hollow columnar object in the filling step. In each diagram, a part of the hollow columnar object 1 and the reinforcing member 20 for a hollow columnar object are shown as a perspective view in order to understand the configuration and operation of the reinforcing member 20 for a hollow columnar object.

[0011] The method of reinforcing a hollow columnar object 1 according to the present disclosure generally includes the steps of (1) preparing a reinforcing member 20 for a hollow columnar object, (2) inserting the reinforcing member 20 for a hollow columnar object into the hollow portion of the hollow columnar object 1, (3) fixing the bag-shaped sheet 3 in a predetermined position using an expansion fixing body 5, (4) retrieving the pushing rod 4, and (5) injecting a fluid hardening material.

[0012] The fiber-reinforced concrete reinforcement material 20 for hollow columns (one example of a reinforcing member for hollow columns) according to the present invention is a bag-shaped sheet 3 made by forming a sheet with a high Young's modulus into a cylindrical shape and sealing the top and bottom ends of the bag-shaped sheet 3, which is folded in half along the long side direction of the sheet. An injection pipe 7 (one example of an injection pipe member) for a fluid hardening material 6 is connected to the sheet and a vinyl hose 8 (one example of an injection pipe member) is connected to the outlet of the injection pipe 7 and is arranged to extend to the bottom of the bag-shaped sheet 3. An expansion fixing body 5 for holding the bag-shaped sheet 3 is connected to the surface of the top of the bag-shaped sheet 3, and a connecting member 10 for a pushing rod 4 for inserting the bag-shaped sheet 3 into the hollow columnar object 1 is provided on the surface of the top of the expansion fixing body 5. In addition, after the bag-shaped sheet 3 is held, the pushing rod 4 is separated from the connecting member 10 and pulled out of the hollow columnar object 1.

[0013] The hollow columnar fiber-reinforced concrete reinforcement 20 of the present invention is stored folded in half along the long side direction of a bag-like sheet 3 obtained by forming a sheet into a cylindrical shape and sealing the top and bottom ends thereof, the sheet being made by impregnating a certain amount of thermosetting resin or thermoplastic resin into a woven fabric made of untwisted or twisted fiber bundles of high Young's modulus filament yarns bundled in a predetermined number and connected with weft yarns.

[0014] The fiber-reinforced concrete reinforcement material 20 for hollow columns according to the present invention has a connecting member 10 for a push rod 4 to be inserted into a predetermined position of the hollow column 1 on the top surface of an expansion fixing body 5 connected to the bag-shaped sheet 3 via a partition wall 9. Inside the tip cap 13 of the connecting member 10, the bag-shaped sheet 3 is engaged or fitted to the connecting member 10 by a plastic belt, a metal belt, an adhesive, or both.

[0015] The push rod can be extended by engaging with the divided portion of the push rod 4 according to the length of insertion along the long side direction of the surface of the bag-shaped sheet, and a male or female screw is formed at the tip, and a female or male screw is formed on the connecting member, and the screws are used alternately when connecting. When inserting, the push rod is engaged and used in a forward rotation, and when the push rod is rotated in the reverse direction at a predetermined position, the push rod is separated from the connecting member and pulled out of the hollow columnar object 1.

[0016] The pushing rod of the hollow columnar fiber-reinforced concrete reinforcement material 20 of the present invention is a flexible resin rod or metal rod with a diameter narrower than the width of the drilled hole 2 (an example of a hole portion) of the hollow columnar object 1, and is arranged in a shape that has no cross-sectional defects.

[0017] In the hollow columnar fiber-reinforced concrete reinforcement material 20 according to the present invention, a T-shaped injection pipe for filling the bag-shaped sheet with a fluid hardening material is disposed in communication with the bag-shaped sheet and is engaged with the bag-shaped sheet by a plastic belt, a metal belt, an adhesive, or both. A vinyl hose is engaged with one of the discharge ports of the T-shaped injection pipe by a plastic belt, a metal belt, an adhesive, or both, and is disposed so as to extend to the bottom of the bag-shaped sheet.

[0018] The fiber-reinforced concrete reinforcement material 20 for hollow columns according to the present invention has an expansion fixation body 5 connected to the surface of the top of the bag-shaped sheet 3 for holding the bag-shaped sheet 3 within the hollow column 1, and the expansion fixation body 5 contains a latex or film balloon. An air tube 11 for remotely injecting air is connected to the balloon, which communicates with the top of the bag-shaped sheet 3, passes through the hollow part of the bag-shaped sheet 3, and is arranged outside the bag-shaped sheet 3 near the communication part of the injection pipe 7, and the outer skin of the balloon is knitted with a cover made of low-elongation fiber molded to a predetermined volume.

[0019] The reinforcement method disclosed in Patent Document 1 involves inserting and pushing up the reinforcing sheet into a predetermined position using a flexible hollow pipe arranged in the hollow portion of the reinforcing sheet which is formed into a cylindrical shape from the base of the hollow columnar object, and then using an expansion material located on the inside of the top part of the reinforcing sheet to press and fix the reinforcing sheet and hollow pipe against the inner wall of the hollow columnar object, and then injecting mortar into the reinforcing sheet through the through hole of the hollow pipe to fill it. Therefore, in the reinforcing method of Patent Document 1, the hollow pipes that are pushed up vertically and the expansive material are arranged inside the reinforcing sheet, so the hollow pipes must be connected within the narrow space of the reinforcing sheet, which is inefficient to work with. In addition, in order to open communication holes in the reinforcing sheet for the hollow pipe connection work, parts of the reinforcing sheet must be cut vertically in multiple places over several tens of centimeters, so that the sheet cannot be kept airtight, causing leakage of the fluid hardening material and a decrease in the strength of the fibers. In addition, the hollow pipes and expansive material remain in the mortar as foreign objects, which also causes a decrease in the strength of the mortar.

[0020] In contrast, the hollow columnar fiber-reinforced concrete reinforcement material of the present invention is a bag-shaped sheet with a high Young's modulus, and the vinyl hose connected to the injection pipe prevents the separation of the fluid hardening material and stabilizes the strength. In addition, since the expansion fixing body and the pushing rod are arranged outside the bag-shaped sheet, no extensive processing such as connecting holes is required in the bag-shaped sheet, and the sheet is not cut, so the material has high airtightness and strength. In addition, the connection work of the pushing rod during insertion can be performed outside the bag-shaped sheet, and the pushing rod does not have any cross-sectional defects such as a discharge port, so the strength is high and the insertion work can be performed easily. In addition, since the pushing rod and the expansion fixing body do not remain as residues in the bag-shaped sheet, the compressive strength of the fluid hardening material does not decrease, making this a hollow columnar fiber-reinforced concrete reinforcement material with excellent strength stability.

[0021] In the embodiment of the fiber-reinforced concrete reinforcement material 20 of the hollow columnar object according to the present invention, the insertion process shown in FIG. 1 shows a form in which a pushing rod 4 connected to the top of the expansion fixing body 5 is inserted through a drilled hole 2 in the hollow columnar object 1 by aligning the pushing rod 4 along the long side direction of the surface of the bag-shaped sheet 3.

[0022] In the embodiment of the fiber-reinforced concrete reinforcement material 20 for a hollow columnar object according to the present invention, the fixing process shown in Figure 2 shows a form in which the extension of the bag-shaped sheet 3 stops at a predetermined position, and the expansion fixation body 5 expands to fix the bag-shaped sheet 3 to the hollow columnar object 1.

[0023] In the embodiment of the fiber-reinforced concrete reinforcement material 20 of the hollow columnar object according to the present invention, the filling process shown in FIG. 3 shows a state in which the pushing rod 4 is pulled out of the hollow columnar object 1, the fluid hardening material 6 is filled into the bag-shaped sheet 3, and the expansion fixing body 5 is contracted.

[0024] In the detailed insertion process shown in Fig. 4 for an embodiment of a hollow columnar fiber-reinforced concrete reinforcement 20 according to the present invention, the threaded portion of the connecting member 10 at the top of the expansion fixing body 5 and the threaded portion of the pusher rod 4 are rotated in the normal direction to engage and connect, and then the pusher rod 4 is inserted along the long side direction of the surface of the bag-like sheet 3 through the drilled hole 2 of the hollow columnar object 1. The form shown is one in which the tip of the pusher rod 4, which is added according to the extension length, is rotated in the normal direction to engage and connect with the threaded portion at the bottom end of the pusher rod, and then extended.

[0025] Regarding the embodiment of the fiber-reinforced concrete reinforcement material 20 for hollow pillars according to the present invention, the details of the fixing process and filling process shown in Fig. 5 show that the expansion of the bag-shaped sheet 3 stops at a predetermined position, the expansion fixing body 5 is filled with air from the air tube 11, expands, and the bag-shaped sheet is fixed to the hollow pillar, and then the pushing rod 4 is rotated in the reverse direction to separate it from the connecting member 10 and pulled out. When the fluid hardening material 6 is filled from the injection tube 7, the fluid hardening material is filled from the bottom of the bag-shaped sheet 3 from the discharge port on the vinyl hose 8 side of the T-shape without being separated, and when it exceeds the level of the injection tube 7, the fluid hardening material 6 is filled into the bag-shaped sheet 3 from one of the discharge ports of the T-shape, and after it is fully filled, the airtightness of the expansion fixing body 5 is released to allow it to shrink or to complete the reinforcement while it is expanded.

[0026] The reinforcing member 20 for a hollow columnar object will be described again with reference to FIGS. As shown in FIG. 1, the reinforcing member 20 for hollow columnar objects according to the present disclosure generally comprises a bag-shaped sheet 3, a pushing rod 4, an expansion fixing body 5, a connecting member 10, and an injection tube 7 (an example of an injection tube member).

[0027] The bag-shaped sheet 3 is an element that reinforces the hollow columnar object 1, which is the object to be reinforced. The bag-shaped sheet 3, for example, applies resistance to bending moments and resistance to horizontal loads to the hollow columnar object 1. The bag-shaped sheet 3 generally has a hollow columnar bag shape corresponding to the hollow shape of the hollow columnar object 1. In other words, the bag-shaped sheet 3 has a cylindrical shape corresponding to the hollow of the hollow columnar object. The hollow columnar object 1 is reinforced by integrally fixing the bag-shaped sheet 3 to the inner surface of the hollow columnar object 1. A fluid hardening material 6 is used as a fixing material for integrally fixing the bag-shaped sheet 3 to the inner surface of the hollow columnar object 1.

[0028] The bag-shaped sheet 3 is made of a sheet with a high Young's modulus. The bag-shaped sheet 3 is made, for example, by forming this sheet into a cylindrical shape and sealing the upper and lower ends. The upper end of the bag-shaped sheet 3 may be sealed by a partition wall 9, for example, as shown in Fig. 4. The upper and / or lower ends of the bag-shaped sheet 3 may be sealed by adhesive, sewing with a sewing machine, or the like.

[0029] In this specification, "high Young's modulus" means that the elastic modulus (tensile elastic modulus) of the bag-shaped sheet 3 at least in the longitudinal direction is higher than the elastic modulus (tensile elastic modulus) in the axial direction of the hollow columnar object 1 to be repaired. The elastic modulus of the bag-shaped sheet 3 is preferably higher than the elastic modulus required for the hollow columnar object 1, and for example, is preferably equal to or higher than the elastic modulus of the hollow columnar object 1 at the time of initial manufacture. For reference, the tensile elastic modulus of a concrete structure is generally estimated to be equal to or somewhat smaller than the compressive elastic modulus. The compressive elastic modulus (Young's modulus) of reinforced concrete is variously stipulated depending on the design standard strength, etc., but it is generally 3.80×10 at a design standard strength of 80. 4 N / mm 2 Above, for PHC piles, 4.00 x 10 4 N / mm 2 That's all.

[0030] The bag-shaped sheet 3 can be made of, for example, high elastic modulus fibers. The bag-shaped sheet 3 is preferably a woven fabric made of high elastic modulus fibers. The woven fabric made of high elastic modulus fibers is, for example, a woven fabric in which a predetermined number of high elastic modulus fibers (for example, filament yarns) are bundled together to form untwisted or twisted fiber bundles (warp yarns) connected by weft yarns. The woven fabric made of high elastic modulus fibers may be, although not essential, further impregnated with a resin material (for example, a thermosetting resin or a thermoplastic resin) and cured. In this specification, the high elastic modulus fiber refers to a fiber having a tensile strength of 20 g / d (17.7 cN / dtex) or more and a tensile modulus of elasticity of 400 g / d (50 GPa, approximately 353 cN / dtex) or more. Although not limited thereto, the tensile modulus of the high elastic modulus fiber is more preferably 500 cN / dtex or more, 700 cN / dtex or more, 700 cN / dtex or more, 1000 cN / dtex or more, or 1200 cN / dtex or more. In addition, the number of fiber bundles constituting the woven fabric may be, for example, 10,000 or more. Examples of such high elastic modulus fibers include aramid fibers, carbon fibers, high-density polyethylene fibers, and polybenzazole fibers.

[0031] The bag-shaped sheet 3 is preferably folded in a state before construction, by crushing and folding a generally cylindrical sheet into a flat, generally two-dimensional strip, and then folding the sheet into a thinner strip with the crease (folded portion 12) along the longitudinal direction (for example, the direction of the cylinder axis). The bag-shaped sheet 3 may be folded in half lengthwise (with the crease along the longitudinal direction), or may be folded in multiple layers like a folding screen. By folding the sheet into a thin shape that is easily unfolded, the hollow columnar object reinforcing member 20 can be easily inserted into the hollow of the hollow columnar object 1 in the insertion step during construction. The bag-shaped sheet 3 may be folded with the air tube 11, which will be described later, inserted into the inside of the cylindrical bag-shaped sheet 3. The bag-shaped sheet 3 folded into a thin strip may be fixed at the upper end to the partition wall 9 in the folded state, and the lower end may be sealed. In this case, the air tube 11 may be inserted into the partition wall 9, which will be described later. This allows the folded shape to be stably maintained. Furthermore, the bag-shaped sheet 3 folded into a thin strip may be rolled up or folded lengthwise for convenience in storage, keeping, transport, etc.

[0032] The injection pipe 7 is an element that provides a flow path for injecting the fluid hardening material 6 into the bag-shaped sheet 3. The injection pipe 7 is an additional element, and is attached to the bag-shaped sheet 3 at a position corresponding to the drilled hole 2 when, for example, a hollow columnar object 1 to be reinforced is provided with a drilled hole 2 for reinforcement work and a bag-shaped sheet 3 is inserted into the hollow of the hollow columnar object 1. The injection pipe 7 is attached to the bag-shaped sheet 3 at any timing. For example, the injection pipe 7 is attached to the bag-shaped sheet 3 during construction, before construction (including during the manufacture of the reinforcing member 20 for hollow columnar objects), or during the injection process.

[0033] The injection pipe 7 has a T-shaped flow path consisting of a first flow path that communicates between the inside and outside of the bag-like sheet 3, a second flow path that communicates with the first flow path and extends along the longitudinal direction of the bag-like sheet 3 toward the upper end, and a third flow path that extends toward the lower end. The injection pipe 7 in this embodiment is a T-shaped pipe. A vinyl hose 8 is connected to the third flow path of the injection pipe 7 that is a T-shaped pipe. The vinyl hose 8 has a length that allows it to be disposed up to the hollow bottom of the hollow columnar object 1 (which may be the bottom of the bag-like sheet 3) or its vicinity when the bag-like sheet 3 is inserted into the hollow of the hollow columnar object 1 to be reinforced.

[0034] The pushing rod 4 is an element for inserting the bag-shaped sheet 3 into the inside of the hollow columnar object 1. The pushing rod 4 is a rod-shaped body made of a flexible material (for example, a resin material or a metal material). The pushing rod 4 is not limited to this, but may have a diameter of, for example, about 30 mm to 40 mm. During construction, the upper end of the bag-shaped sheet 3 is connected to the tip of the pushing rod 4 using a connecting member 10. The pushing rod 4 of this embodiment is configured to be divisible into multiple parts (divided parts) in the longitudinal direction. In the example shown in FIG. 2, the pushing rod 4 is composed of three members in the longitudinal direction. Each member is configured to be detachable, for example, by a screw structure. The pushing rod 4 is made to have a length such that the lower end remains outside the drilled hole 2 when the tip reaches the upper end of the hollow inside the hollow columnar object 1.

[0035] The expansion fixing body 5 is an element connected to the upper end side of the bag-shaped sheet 3 and fixes (positions) the bag-shaped sheet 3 inside the hollow columnar object 1. The expansion fixing body 5 expands inside the hollow columnar object 1 and applies an expansion pressure to the inner wall, thereby obtaining a resistance force against gravity acting vertically downward, thereby fixing the vertical position relative to the hollow columnar object 1. By extension, the expansion fixing body 5 is capable of supporting the bag-shaped sheet 3 by suspending it at a predetermined height inside the hollow columnar object 1.

[0036] The expansion fixing body 5 includes, for example, an expansion section made of an elastic material and expanding when air is introduced thereinto, an air tube 11 connected to the expansion section for introducing air into the expansion section, and a connecting section connecting the expansion section to the tip of the push rod 4 and the bag-shaped sheet 3. In this embodiment, the expansion section of the expansion fixing body 5 is configured by a balloon made of an elastic rubber material or a resin film material. The expansion section of the expansion fixing body 5 is designed to be able to expand larger than the hollow diameter (inner diameter) of the hollow columnar object 1. The expansion section of the expansion fixing body 5 is preferably designed to have a material, dimensions, and shape that allows it to contact the inner wall of the hollow columnar object 1 with a sufficient area so that it has sufficient effectiveness to suspend and support the bag-shaped sheet 3 when expanded. The connecting section may be integrally formed with the expansion section, or may be provided as a separate element from the expansion section. When the connecting part is a separate element from the expansion part, for example, the connecting part can be composed of a material (e.g., a sheet-like body, a woven body, a mesh-like body, a string-like body, etc.) that holds the expansion part and connects it to the tip of the pushing rod 4 and the bag-like sheet 3, and does not hinder the expansion of the expansion part.

[0037] The expansion part of the expansion fixing body 5 may be, for example, a balloon having a two-layer structure with a layer of low-elongation fiber as an outer skin. The low-elongation fiber may be a fiber material having a relatively lower elongation than the constituent material of the balloon, and examples thereof include low-elongation nylon fiber, polyarylate fiber, low-elongation polyester fiber, low-elongation aramid fiber, polyvinylidene fluoride fiber, etc. By making the expansion part have such a two-layer structure, when the bag-like sheet 3 is expanded so as to be able to support it by hanging, the expansion part can be prevented from being damaged due to friction between the expansion part and the inner wall of the hollow columnar object 1. This is also preferable in that the grip force against the inner wall of the hollow columnar object 1 is increased. The elongation can be evaluated, for example, by the "elongation rate" defined in JIS L1096:2020.

[0038] One end (upper end) of the air tube 11 is connected to the opening of the balloon. The air tube 11 is, for example, inserted through and fixed to the partition wall 9. The air tube 11 is disposed inside the bag-shaped sheet 3 along the longitudinal direction through the partition wall 9. The air tube 11 is long enough to lead the other end (lower end) out of the bag-shaped sheet 3 at a position corresponding to the drilled hole 2 in the bag-shaped sheet 3 and extend outside the drilled hole 2 when the bag-shaped sheet 3 is inserted into the hollow of the hollow columnar object 1.

[0039] The connecting member 10 is an element that connects the expansion fixed body 5 and the tip of the push rod 4. The connecting member 10 detachably connects, for example, the tip of the push rod 4. The connecting member 10 includes a tip cap 13 and a push rod connecting part 14, as shown in FIG. 4, for example. The tip cap 13 fixes the expansion fixed body 5 and the push rod connecting part 14. The push rod connecting part 14 is a flexible rod-shaped body. The push rod connecting part 14 has a longitudinal dimension (vertical direction) longer than the expansion fixed body 5, and detachably connects the push rod 4 below the expansion fixed body 5. This allows the push rod 4 to be detached after the expansion fixed body 5 expands and supports the bag-shaped sheet 3 by suspending it. The connecting structure between the push rod connecting part 14 and the push rod 4 may be, for example, a screw structure. Here, the thread structure between the push rod connection portion 14 and the push rod 4 may be configured to be detachable with less force (e.g., smaller tightening torque and / or nominal diameter, etc.) compared to the thread structure provided between each divided portion of the separable push rod 4, or may be a reverse thread structure with the threading direction reversed.

[0040] Next, each step of the method for reinforcing a hollow columnar object 1 using the reinforcing member for hollow columnar objects 20 will be described. Note that, prior to the (2) insertion step, a hole for work (drilled hole 2) is provided in the hollow columnar object 1 in advance. The drilled hole 2 may be located, for example, at a position that allows good workability, for example, at a position about 50 cm to 1 m above the ground.

[0041] (1) In the step of preparing the reinforcing member 20 for hollow columnar objects, the reinforcing member 20 for hollow columnar objects is assembled (see Figs. 1 and 4). That is, the expansion fixing body 5 is attached to the upper end side of the bag-like sheet 3, and this expansion fixing body 5 is fixed to the tip cap 13 of the connecting member 10. Also, the pushing rod connecting part 14 is fixed to the tip cap 13 of the connecting member 10, and the pushing rod connecting part 14 and the pushing rod 4 are connected. If the pushing rod 4 is a split type, only the split part at the tip side needs to be attached. Also, if necessary, the air tube 11 may be led out from the position corresponding to the drilling hole 2 in the bag-like sheet 3, and the injection tube 7 connected to the vinyl hose 8 may be attached to the position corresponding to the drilling hole 2.

[0042] (2) In the process of inserting the reinforcing member 20 for a hollow columnar object into the hollow part of the hollow columnar object 1, the assembled reinforcing member 20 for a hollow columnar object is inserted from the tip, i.e., from the tip cap 13 of the connecting member 10, toward the upper part of the hollow columnar object 1 through the drilled hole 2 (see FIG. 1). At this time, the next divided part is added before the entire length of the member of the pushing rod 4 is inserted, so that the pushing rod 4 of a predetermined length can be constructed inside the hollow columnar object 1 with good workability. As the pushing rod 4 is extended and inserted, the upper end of the bag-shaped sheet 3 is lifted up above the hollow columnar object 1. The lower end side of the bag-shaped sheet 3 may be inserted into the hollow columnar object 1 at an appropriate timing. When the tip cap 13 of the connecting member 10 reaches a predetermined position in the hollow columnar object 1 (for example, a predetermined position based on a scaffolding nail), the insertion process is completed.

[0043] (3) In the process of fixing the bag-shaped sheet 3 at a predetermined position by the expansion fixing body 5, the expansion portion is expanded (see Figs. 2 and 5). Specifically, for example, the lower end of the air tube 11 is pulled out from the drilled hole 2, and air is sent to the expansion portion of the expansion fixing body 5 through the air tube 11 by a compressor or the like to expand the expansion portion. After the expansion portion is expanded to a predetermined pressure, the lower end of the air tube 11 is airtightly sealed. As a result, the bag-shaped sheet 3 is suspended and supported by the expansion fixing body 5, not by the pushing rod 4. Also, the connecting member 10 is sandwiched and positioned between the inner wall of the hollow columnar object 1 and the expansion fixing body 5 in the vertical and horizontal directions.

[0044] (4) In the step of recovering the pushing rod 4, first, the pushing rod 4 is detached from the pushing rod connecting portion 14 of the connecting member 10. For example, the lower end of the pushing rod 4 is rotated to detach the pushing rod 4 from the pushing rod connecting portion 14. Thereafter, the pushing rod 4 can be recovered by pulling it out of the drilled hole 2.

[0045] (5) In the step of injecting the fluid hardener 6, the fluid hardener 6 is injected into the bag-shaped sheet 3 through the injection pipe 7 and the vinyl hose 8. For example, mortar or concrete can be used as the fluid hardener 6. The vinyl hose 8 provides a flow path to the hollow bottom of the hollow columnar object 1 below the drilled hole 2. This allows the fluid hardener 6 to be stably supplied to a level below the drilled hole 2. In particular, when the fluid hardener 6 is mortar or concrete, the fluid hardener 6 can be supplied to the bag-shaped sheet 3 while suppressing separation of aggregate due to falling. In addition, above the drilled hole 2, the fluid hardener 6 can be supplied to the bag-shaped sheet 3 without separation of aggregate. At this time, the bag-shaped sheet 3 is pressed against the inner wall of the hollow columnar object 1 by the weight of the fluid hardener 6, and the fluid hardener 6 hardens in this state. This allows the inside of the hollow columnar object 1 to be reinforced with a hardened material reinforced by the bag-shaped sheet 3 (for example, fiber-reinforced concrete / mortar). At least one of injection tube 7 and vinyl hose 8 may be withdrawn before flowable hardening material 6 hardens.

[0046] According to the above-mentioned configuration, the push rod 4 and the expansion fixed body 5 are disposed outside the bag-shaped sheet 3. Therefore, it is not necessary to insert the push rod 4 and the expansion fixed body 5 from the lower end of the bag-shaped sheet 3 into the inside of the bag-shaped sheet 3 during construction, and it is also not necessary to insert the bag-shaped sheet 3 when adding a divided member to the push rod 4. Therefore, the hollow columnar object 1 can be repaired with good workability. In addition, the push rod 4 and the expansion fixed body 5 are not present inside the fluid hardener 6 (and thus the hardened product), and it is possible to suppress the reduction in the strength (e.g., compressive strength and tensile strength) of the hardened product caused by the presence of the push rod 4 and the expansion fixed body 5 and their deterioration and volumetric deformation. Furthermore, since the push rod 4 is recovered from the inside of the hollow columnar object 1, it can be used repeatedly within the range where there is no problem with strength, etc. Therefore, it is advantageous in terms of cost.

[0047] In the method for reinforcing a hollow columnar object 1 according to the present disclosure, the pushing rod 4 and, if necessary, at least one of the injection tube 7 and the vinyl hose 8 can be collected and reused. Therefore, the present disclosure can provide a kit for reinforcing a hollow columnar object, which includes, for example, a bag-shaped sheet 3, an expansion fixing body 5, and a connecting member 10 as consumables of the reinforcing member 20 for a hollow columnar object.

[0048] The present disclosure is not limited to the above-described embodiments, and includes various modified examples. For example, the above-described embodiments have been described in detail to clearly explain the present disclosure, and are not necessarily limited to those having all of the configurations described. In addition, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

[0049] For example, as shown in Fig. 6, the partition wall 9 is not necessarily required. Furthermore, the configuration of the connection between the expansion fixed body 5 and the connecting member 10, and between the expansion fixed body 5 and the bag-like sheet 3 is not limited to this example. A person skilled in the art who has come into contact with this disclosure can consider various modified forms.

[0050] The present disclosure discloses any one or a combination of two or more of the following configurations 1 to 8. [Configuration 1] The fiber-reinforced concrete reinforcement material for hollow columns according to the present invention is a bag-shaped sheet formed by forming a sheet with a high Young's modulus into a cylindrical shape and sealing the top and bottom ends of the bag-shaped sheet, in which the folded portion where the sheet is folded in half along the long side direction and stored and the bag-shaped sheet are connected to an injection pipe for a fluid hardening material, and a vinyl hose is connected to the discharge outlet and disposed so as to extend to the bottom of the bag-shaped sheet. An expansion fixing body for holding the sheet is connected to the surface of the top of the bag-shaped sheet, and a connecting member for a pushing rod for inserting the sheet into the hollow column is provided on the surface of the top of the fixing body. The fiber-reinforced concrete reinforcement material for hollow columns is characterized in that after the bag-shaped sheet is held, the pushing rod is separated from the connecting member and pulled out of the hollow column. [Configuration 2] The bag-shaped sheet is a sheet made by impregnating a certain amount of thermosetting resin or thermoplastic resin into the fibers of a woven fabric in which a predetermined number of non-twisted or twisted fiber bundles of high Young's modulus filament yarns are bundled together and connected with weft yarns, and the hollow columnar fiber-reinforced concrete reinforcement material according to the above configuration 1 is a sheet. [Configuration 3] The fiber-reinforced concrete reinforcement material for hollow columns according to the above configuration 1 or 2, wherein the bag-shaped sheet has a folding portion for storing the sheet by folding it in half evenly along the long side direction of the sheet. [Configuration 4] A fiber-reinforced concrete reinforcement material for a hollow column according to any one of the above configurations 1 to 3, in which a connecting member for a push rod to be inserted into a predetermined position of the hollow column is disposed on the surface of the top of the expansion fixing body connected via the partition wall of the bag-shaped sheet. [Configuration 5] The push rod can be extended by engaging the divided portion of the push rod according to the length of insertion along the long side direction of the surface of the bag-shaped sheet, and a male or female screw is formed at the tip of the push rod, and a female or male screw is formed on the connecting member, and the screws are used alternately when connecting. When inserting, the push rod is engaged and used in a forward rotation, and at a predetermined position, the push rod is rotated in the reverse direction to separate the push rod from the connecting member and pull out of the hollow column-shaped object. The fiber-reinforced concrete reinforcement material for hollow column-shaped object described in any one of the above configurations 1 to 4. [Configuration 6] A T-shaped injection pipe for filling the bag-shaped sheet with a fluid hardening material is disposed so as to communicate with the bag-shaped sheet, and is engaged with the bag-shaped sheet by a plastic belt, a metal belt, an adhesive, or both, and a vinyl hose is disposed at one outlet of the T-shaped injection pipe, which is engaged with a plastic belt, a metal belt, an adhesive, or both and extends to the bottom of the bag-shaped sheet. [Configuration 7] The expansion fixing body encloses a balloon made of latex or film, and an air tube for injecting air is connected to the balloon, which communicates with the top of the bag-shaped sheet, passes through the hollow part of the bag-shaped sheet, and is disposed outside the sheet through the communication part of the injection tube, and the outer skin of the balloon is knitted with a cover made of low-elongation fiber molded to a predetermined volume. The fiber-reinforced concrete reinforcement material for hollow pillars according to any one of the above configurations 1 to 6. [Configuration 8] The fiber-reinforced concrete reinforcement material of the hollow column according to any one of the above configurations 1 to 7, wherein the pushing rod is a flexible resin rod or metal rod having a diameter smaller than the width of the hole of the hollow column, and is arranged in a shape without cross-sectional defects. The bag-shaped sheet 3 is formed by forming a sheet with a high Young's modulus into a cylindrical shape and sealing the top and bottom ends thereof, and a folded portion 12 where the sheet is folded in half along the long side direction and stored is connected to an injection pipe 7 for a fluid hardener 6, and a vinyl hose 8 is connected to the discharge port and disposed so as to extend to the bottom of the bag-shaped sheet. An expansion fixture 5 for holding the sheet is connected to the surface of the top of the bag-shaped sheet, and a connecting member 10 for a push rod 4 for inserting the bag-shaped sheet into the hollow columnar object is provided on the surface of the top of the expansion fixture. Also, after the sheet is held, the push rod 4 is separated from the connecting member 10 and pulled out of the hollow columnar object. [Explanation of symbols]

[0051] 1 hollow columnar object 2 Drilling 3. Bag-shaped sheet 4 Push rod 5 Expansion fixed body 6 Fluid hardening material 7 Injection tube 8 Vinyl hose 9 Bulkhead 10 Connecting members 11 Air tube 12 Oribe 13 Tip cap 14 Push rod connection 20 Fiber-reinforced concrete reinforcement material (reinforcement material for hollow columns)

Claims

1. A reinforcing member for a hollow column, A hollow cylindrical bag-shaped sheet; A push rod for inserting the bag-shaped sheet into the hollow columnar object; an expansion fixing body provided at one end of the bag-shaped sheet and expanding to fix the bag-shaped sheet inside the hollow columnar object; a connecting member that detachably connects the expansion fixed body and the tip of the push rod; A reinforcing member for a hollow columnar object comprising:

2. The bag-shaped sheet is composed of a woven fabric in which untwisted or twisted fiber bundles formed by bundling filament yarns are connected with weft yarns, and a resin impregnated in the woven fabric and hardened. The reinforcing member for a hollow pillar according to claim 1 .

3. In the bag-shaped sheet, before the fluid hardening material is injected, a cylindrical body corresponding to the hollow of the hollow columnar object is folded flat, and further folded so that the crease is along the cylindrical axis direction. The reinforcing member for a hollow pillar according to claim 1 .

4. The bag-shaped sheet has one end sealed by a plate-shaped partition wall and is fixed to the expansion fixed body via the partition wall. The reinforcing member for a hollow pillar according to claim 1 .

5. The push rod is made of a flexible resin material or metal material. The reinforcing member for a hollow pillar according to claim 1 .

6. The push rod is configured to be divisible into a plurality of parts in the longitudinal direction. The reinforcing member for a hollow pillar according to claim 1 .

7. the expansion fixed body includes an expansion section made of an elastic material and expanding when air is introduced thereinto, and an air tube connected to the expansion section for introducing air into the expansion section; The air tube is disposed inside the bag-shaped sheet so as to extend along the longitudinal direction. The reinforcing member for a hollow pillar according to claim 1 .

8. The reinforcing member for a hollow columnar object according to claim 1 , further comprising an injection tube member provided in the bag-shaped sheet for injecting a fluid hardening material.

9. the injection pipe member has a T-shaped flow path including a first flow path communicating the inside and the outside of the bag-shaped sheet, a second flow path communicating with the first flow path and extending along the longitudinal direction of the bag-shaped sheet toward the one end, and a third flow path extending toward the other end, The third flow path has a length that reaches the vicinity of a bottom of the hollow columnar object when the bag-shaped sheet is inserted into the hollow interior of the hollow columnar object. The reinforcing member for a hollow pillar according to claim 8.

10. A reinforcing kit for reinforcing a hollow column, comprising: A hollow cylindrical bag-shaped sheet; an expansion fixing body provided at one end of the bag-shaped sheet and expanding to fix the bag-shaped sheet inside the hollow columnar object; a connecting member for detachably connecting the expansion fixing body and a tip of a pushing rod for inserting the bag-shaped sheet into the hollow columnar object; A reinforcement kit for a hollow column comprising:

11. A reinforcing member for a hollow column, A hollow cylindrical bag-shaped sheet; A push rod for inserting the bag-shaped sheet into the hollow columnar object; an expansion fixing body provided at one end of the bag-shaped sheet and expanding to fix the bag-shaped sheet inside the hollow columnar object; a connecting member that detachably connects the expansion fixed body and the tip of the push rod; A step of preparing a reinforcing member for a hollow column, comprising: a step of inserting a reinforcing member for the hollow columnar object into the hollow portion through a hole portion provided in the hollow columnar object and communicating the hollow portion with the outside; a step of expanding the expansion fixing body to fix the bag-shaped sheet at a predetermined position within the hollow portion; A step of detaching the pushing rod from the hollow columnar reinforcing member and recovering it from the hollow portion; and A step of injecting a flowable hardening material into the bag-shaped sheet; A method for reinforcing a hollow columnar object, comprising:

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