Fiber-reinforced concrete reinforcement for hollow columns

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 pillar-shaped object is described in Patent Document 1. Patent Document 1 discloses that "a reinforcing material 1 is pushed up from below using a hollow pipe 4 to be placed inside a utility pole 100, and a filler material is supplied to the hollow pipe 4, and the filler material is injected into the utility pole 100 using the through-holes 10 in order from the bottom up" (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 easily reinforcing hollow pillars. [Means for solving the problem]

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

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

[0008] [Figure 1] 10A and 10B are schematic diagrams illustrating an insertion step of a method for reinforcing a hollow columnar object according to one embodiment. [Figure 2] 10A and 10B are schematic diagrams illustrating a fixing step in a method for reinforcing a hollow columnar object according to one embodiment. [Figure 3] 1 is a schematic diagram illustrating a filling step of a method for reinforcing a hollow columnar object according to an 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. [Figure 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] 10A and 10B are schematic diagrams illustrating an insertion step of a method for reinforcing a hollow columnar object according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes a method for reinforcing a hollow pillar and a reinforcing member for a hollow pillar according to the present disclosure, with appropriate reference to the drawings. In this disclosure, a hollow pillar is reinforced using a reinforcing member for a hollow pillar. Examples of hollow pillars that can be used include, but are not limited to, hollow concrete poles such as concrete wiring poles (a concept that includes telegraph poles, communication poles, etc.), support poles (poles for supporting lighting, cameras, nets, etc.), and chimneys.

[0010] 1 to 3 are schematic diagrams illustrating the inserting step, fixing step, and filling step, respectively, of 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, parts of the hollow columnar object 1 and the reinforcing member 20 for a hollow columnar object are shown in perspective to facilitate understanding of the configuration and operation of the reinforcing member 20 for a hollow columnar object.

[0011] The method for 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-like 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 pillars (an example of a reinforcing member for hollow pillars) according to the present invention comprises a bag-shaped sheet 3 formed by molding a high Young's modulus sheet into a cylindrical shape and sealing the top and bottom ends of the bag-shaped sheet 3 in half along the long side of the sheet. An injection pipe 7 (an example of an injection pipe member) for a fluid hardening material 6 is connected to the sheet and a vinyl hose 8 (an example of an injection pipe member) is connected to the outlet of the injection pipe member and extends to the bottom of the bag-shaped sheet 3. An expansion retainer 5 for holding the bag-shaped sheet 3 is connected to the top surface of the expansion retainer 5, and a connecting member 10 for a pushing rod 4 for inserting the bag-shaped sheet 3 into the hollow pillar 1 is provided on the top surface of the expansion retainer 5. After holding the bag-shaped sheet 3, the pushing rod 4 is separated from the connecting member 10 and pulled out of the hollow pillar 1.

[0013] The hollow columnar fiber reinforced concrete reinforcement material 20 according to the present invention is stored folded in half along the long side direction in a bag-like sheet 3 formed by sealing the top and bottom ends of a cylindrical sheet made by weaving 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, and then impregnating the fibers with a certain amount of thermosetting or thermoplastic resin.

[0014] The hollow columnar fiber reinforced concrete reinforcement 20 according to the present invention has a connecting member 10 for a push rod 4 to be inserted into a predetermined position in the hollow columnar object 1, disposed 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 the divided portion of the push rod 4 along the long side direction of the surface of the bag-shaped sheet according to the length of insertion, and the tip of the push rod is formed with a male or female screw, and the connecting member is formed with a female or male screw, and the screws are used alternately when connecting. When inserting, the push rod is engaged and used by rotating it in the forward direction, and when it reaches a predetermined position, the push rod is rotated in the reverse direction, so that it separates from the connecting member and is 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 does not have any cross-sectional defects.

[0017] In the hollow columnar fiber-reinforced concrete reinforcement 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. In addition, a vinyl hose is engaged with one outlet 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 of the hollow columnar object according to the present invention has an expansion retainer 5 connected to the surface of the top of the bag-shaped sheet 3 for holding the bag-shaped sheet 3 inside the hollow columnar object 1, and the expansion retainer 5 contains a latex or film balloon. An air tube 11 for remotely injecting air is connected to the balloon, which passes through the hollow part of the bag-shaped sheet 3 by communicating with the top 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 the reinforcing sheet into a hollow section of a cylindrically shaped reinforcing sheet from the base of a hollow columnar object using a flexible hollow pipe arranged in the hollow section, pushing the sheet up to a predetermined position, and then using an expansion material located inside the top 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 in the hollow pipe to fill it. Therefore, the reinforcing method of Patent Document 1 places the hollow pipes and expansive material, which are pushed up vertically, inside the reinforcing sheet, which requires connecting the hollow pipes within the narrow space of the reinforcing sheet, resulting in poor workability. Furthermore, since communication holes are drilled in the reinforcing sheet for connecting the hollow pipes, parts of the reinforcing sheet must be cut vertically in multiple locations over several tens of centimeters, which makes it impossible to maintain a tight seal, resulting in leakage of the fluid hardening material and a decrease in the strength of the fibers. Furthermore, the hollow pipes and expansive material remain in the mortar as foreign matter, which also reduces the strength of the mortar.

[0020] In contrast, the hollow columnar fiber-reinforced concrete reinforcement 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 separation of the fluid hardening material, stabilizing its strength. Furthermore, because the expansion fixator and pusher rod are disposed outside the bag-shaped sheet, no extensive processing such as connecting holes is required in the bag-shaped sheet, and there is no cutting of the sheet, resulting in high airtightness and strength. Furthermore, the connection work of the pusher rod during insertion can be performed outside the bag-shaped sheet, and there are no cross-sectional defects such as discharge ports in the pusher rod, resulting in high strength and easy insertion. Furthermore, because no pusher rod or expansion fixator remains inside the bag-shaped sheet, the compressive strength of the fluid hardening material does not decrease, resulting in a hollow columnar fiber-reinforced concrete reinforcement with excellent strength stability.

[0021] In the embodiment of the fiber-reinforced concrete reinforcement material 20 for hollow columnar objects according to the present invention, the insertion process shown in Figure 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, with the pushing rod 4 aligned in 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 hollow columnar objects according to the present invention, the fixing process shown in Figure 2 shows a form in which the expansion of the bag-shaped sheet 3 stops at a predetermined position, the expansion fixation body 5 expands, and the bag-shaped sheet 3 is fixed to the hollow columnar object 1.

[0023] In the embodiment of the hollow columnar fiber-reinforced concrete reinforcement material 20 according to the present invention, the filling process shown in FIG. 3 shows the 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 fixation body 5 is shrunk.

[0024] In the detailed insertion process shown in Figure 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 fixation body 5 and the threaded portion of the pusher rod 4 are rotated forward 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 in the hollow columnar object 1. The form shown is one in which the tip of an additional pusher rod 4, added depending on the extension length, is rotated forward to engage and connect with the threaded portion at the bottom end of the pusher rod, and then the extension is performed.

[0025] In the embodiment of the fiber-reinforced concrete reinforcement material 20 for hollow pillars according to the present invention, the details of the fixing and filling processes are shown in Figure 5. The expansion of the bag-shaped sheet 3 stops at a predetermined position, and air is filled into the expansion fixation body 5 through the air tube 11, expanding the bag-shaped sheet and fixing it to the hollow pillar. After that, the push rod 4 is reversed to separate it from the connecting member 10 and pulled out. When the fluid hardening material 6 is filled from the injection pipe 7, it is poured from the bottom of the bag-shaped sheet 3 through the outlet on the T-shaped vinyl hose 8 side without separating. When it exceeds the level of the injection pipe 7, the fluid hardening material 6 is poured into the bag-shaped sheet 3 from one outlet of the T-shaped. After it is fully filled, the airtight seal of the expansion fixation body 5 is released to allow it to shrink or it remains expanded to complete the reinforcement.

[0026] The reinforcing member 20 for a hollow columnar object will be explained again with reference to FIGS. As shown in FIG. 1, the reinforcing member 20 for a hollow columnar object according to the present disclosure generally comprises a bag-shaped sheet 3, a push 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 provides, for example, 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 1. By integrally fixing the bag-shaped sheet 3 to the inner surface of the hollow columnar object 1, the hollow columnar object 1 is reinforced. Note that 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 with a partition wall 9, as shown in FIG. 4, for example. The upper and / or lower ends of the bag-shaped sheet 3 may also be sealed with an adhesive, by 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) of the hollow columnar object 1 to be repaired in the axial direction. 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 manufacture. For reference, the tensile elastic modulus of a concrete structure is generally estimated to be equal to or slightly smaller than the compressive elastic modulus. The compressive elastic modulus (Young's modulus) of reinforced concrete is variously defined depending on the design standard strength, etc., but it is 3.80 x 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-elasticity fibers. The bag-shaped sheet 3 is preferably a woven fabric made of high-elasticity fibers. A woven fabric made of high-elasticity fibers is, for example, a woven fabric in which a predetermined number of high-elasticity fibers (for example, filament yarns) are bundled together to form untwisted or twisted fiber bundles (warp yarns) connected by weft yarns. Although not essential, a woven fabric made of high-elasticity fibers may be impregnated with and cured with a resin material (for example, a thermosetting resin or a thermoplastic resin). In this specification, a high-elasticity 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-elasticity fiber is 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. Furthermore, the number of fiber bundles constituting the woven fabric may be, for example, 10,000 or more. Examples of such high-elasticity fibers include aramid fiber, carbon fiber, high-density polyethylene fiber, and polybenzazole fiber.

[0031] Prior to construction, the bag-like sheet 3 is preferably prepared by flattening and folding a generally cylindrical sheet into a flat, approximately two-dimensional strip, and then folding the resulting sheet into a thinner strip with the crease (folded portion 12) along the longitudinal direction (e.g., the direction of the cylindrical axis). The bag-like sheet 3 may be folded in half lengthwise (with the crease along the longitudinal direction), or may be folded multiple times 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 columnar object 1 during the insertion step during construction. The bag-like sheet 3 may be folded with the air tube 11 (described later) inserted into the cylindrical bag-like sheet 3. The upper end of the bag-like sheet 3 folded into a thin strip may be fixed to the partition wall 9 while the lower end is sealed. In this case, the air tube 11 may be inserted through the partition wall 9, as described later. This allows the folded shape to be stably maintained. Furthermore, the bag-like sheet 3 folded into a thin strip may be rolled up or folded lengthwise for convenient storage, keeping, transportation, 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 hole 2 for reinforcement work is drilled in the hollow columnar object 1 to be reinforced and the 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 manufacturing 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 connects the inside and outside of the bag-shaped sheet 3, a second flow path that communicates with the first flow path and extends along the longitudinal direction of the bag-shaped 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-pipe. A vinyl hose 8 is connected to the third flow path of the injection pipe 7, which is a T-pipe. The vinyl hose 8 has a length that allows it to be disposed at or near the hollow bottom of the hollow columnar object 1 (which may be the bottom of the bag-shaped sheet 3) when the bag-shaped sheet 3 is inserted into the hollow of the hollow columnar object 1 to be reinforced.

[0034] The push rod 4 is an element for inserting the bag-shaped sheet 3 into the hollow columnar object 1. The push rod 4 is a rod-shaped body made of a flexible material (e.g., a resin material or a metal material). The push rod 4 is not limited to this, but may have a diameter of, for example, approximately 30 mm to 40 mm. During construction, the upper end of the bag-shaped sheet 3 is connected to the tip of the push rod 4 using a connecting member 10. The push rod 4 of this embodiment is configured to be separable into multiple parts (segments) in the longitudinal direction. In the example shown in Figure 2, the push 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 push rod 4 is long enough so that when the tip reaches the upper end of the hollow inside the hollow columnar object 1, the lower end remains outside the drilled hole 2.

[0035] The expansion fixing body 5 is connected to the upper end side of the bag-shaped sheet 3 and is an element that 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 expansion pressure to the inner wall, thereby obtaining resistance to gravity acting vertically downward, and thereby fixing the vertical position of the hollow columnar object 1. In turn, 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 fixture 5 includes, for example, an expansion section made of an elastic material that expands 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 that connects the expansion section to the tip of the push rod 4 and the bag-like sheet 3. In this embodiment, the expansion section of the expansion fixture 5 is configured as a balloon made of an elastic rubber material or resin film material. The expansion section of the expansion fixture 5 is designed to be able to expand to a size larger than the hollow diameter (inner diameter) of the hollow columnar object 1. The expansion section of the expansion fixture 5 is preferably designed with a material, dimensions, and shape that allows it to contact the inner wall of the hollow columnar object 1 over a sufficient area so as to provide sufficient effectiveness for suspending and supporting the bag-like sheet 3 upon expansion. The connecting section may be configured integrally with the expansion section or may be provided as a separate element from the expansion section. When the connecting portion is a separate element from the expansion portion, for example, the connecting portion can be composed of a material (e.g., a sheet-like material, a woven material, a mesh material, a string-like material, etc.) that holds the expansion portion and connects it to the tip of the push rod 4 and the bag-like sheet 3, and does not hinder the expansion of the expansion portion.

[0037] The expansion portion of the expansion fixture 5 may be, for example, a balloon with a two-layer structure having an outer layer made of low-elongation fiber. The low-elongation fiber may be a fiber material with a relatively lower elongation than the constituent material of the balloon, such as low-elongation nylon fiber, polyarylate fiber, low-elongation polyester fiber, low-elongation aramid fiber, or polyvinylidene fluoride fiber. By making the expansion portion have such a two-layer structure, when the expansion portion is inflated so as to be able to support the bag-like sheet 3 by hanging it, damage to the expansion portion due to friction with the inner wall of the hollow columnar object 1 can be prevented. This is also preferable in that it increases the grip force on the inner wall of the hollow columnar object 1. 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 arranged along the longitudinal direction inside the bag-shaped sheet 3, passing 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, for example, 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 fixation body 5 and the tip of the pusher rod 4. The connecting member 10 detachably connects, for example, the tip of the pusher rod 4. As shown in FIG. 4 , for example, the connecting member 10 includes a tip cap 13 and a pusher rod connecting portion 14. The tip cap 13 secures the expansion fixation body 5 and the pusher rod connecting portion 14. The pusher rod connecting portion 14 is a flexible rod-shaped body. The pusher rod connecting portion 14 is longer in the longitudinal direction (vertical direction) than the expansion fixation body 5 and detachably connects the pusher rod 4 below the expansion fixation body 5. This allows the pusher rod 4 to be detached after the expansion fixation body 5 expands and suspends and supports the bag-like sheet 3. The connecting structure between the pusher rod connecting portion 14 and the pusher rod 4 may be, for example, a screw structure. Here, the thread structure between the push rod connecting 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) than 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 a reinforcing member for a hollow columnar object 20 will be described. Note that, prior to the (2) inserting step, a hole for work (boring hole 2) is previously formed in the hollow columnar object 1. The boring hole 2 may be located, for example, at a position that allows for good workability, for example, at a position about 50 cm to 1 m above the ground.

[0041] (1) In the process of preparing the reinforcing member 20 for a hollow columnar object, the reinforcing member 20 for a hollow columnar object described above is assembled (see Figures 1 and 4). That is, an 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. Furthermore, a push rod connecting part 14 is fixed to the tip cap 13 of the connecting member 10, and the push rod connecting part 14 and the push rod 4 are connected. Note that if the push rod 4 is a split type, only the split part at the tip end needs to be attached. Furthermore, if necessary, an air tube 11 can be led out from a position corresponding to the drilled hole 2 in the bag-like sheet 3, or an injection tube 7 connected to a vinyl hose 8 can be attached to a position corresponding to the drilled hole 2.

[0042] (2) In the process of inserting the reinforcing member 20 for a hollow column into the hollow column 1, the assembled reinforcing member 20 for a hollow column is inserted tip-first, i.e., from the tip cap 13 of the connecting member 10, toward the top of the hollow column 1 through the drilled hole 2 (see Figure 1). At this time, by adding the next divided section before the entire length of the pushing rod 4 is inserted, a pushing rod 4 of a predetermined length can be efficiently constructed inside the hollow column 1. As the pushing rod 4 is extended and inserted, the upper end of the bag-like sheet 3 is lifted above the hollow column 1. The lower end of the bag-like sheet 3 may be inserted into the hollow column 1 at an appropriate time. The insertion process is completed when the tip cap 13 of the connecting member 10 reaches a predetermined position in the hollow column 1 (for example, a predetermined position based on a scaffolding nail).

[0043] (3) In the process of fixing the bag-shaped sheet 3 in a predetermined position with the expansion fixture 5, the expansion portion is expanded (see Figures 2 and 5). Specifically, for example, the lower end of the air tube 11 is pulled out of the drilled hole 2, and air is sent to the expansion portion of the expansion fixture 5 through the air tube 11 using a compressor or the like, causing the expansion portion to expand. 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 not by the pushing rod 4 but by the expansion fixture 5. Furthermore, the connecting member 10 is sandwiched and positioned between the inner wall of the hollow columnar object 1 and the expansion fixture 5 in the vertical and horizontal directions.

[0044] (4) In the step of recovering the pusher rod 4, first, the pusher rod 4 is detached from the pusher rod connecting portion 14 of the connecting member 10. For example, the lower end of the pusher rod 4 is rotated to detach the pusher rod 4 from the pusher rod connecting portion 14. Thereafter, the pusher 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 via the injection pipe 7 and the vinyl hose 8. Examples of the fluid hardener 6 include mortar and concrete. 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 for a stable supply of the fluid hardener 6 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 preventing aggregate separation due to falling. Furthermore, the fluid hardener 6 can be supplied to the bag-shaped sheet 3 above the drilled hole 2 without causing aggregate separation. At this time, the weight of the fluid hardener 6 presses the bag-shaped sheet 3 against the inner wall of the hollow columnar object 1, and the fluid hardener 6 hardens in this state. This allows the interior of the hollow columnar object 1 to be reinforced with a hardened material (e.g., fiber-reinforced concrete / mortar) reinforced by the bag-shaped sheet 3. At least one of the injection tube 7 and the vinyl hose 8 may be withdrawn before the flowable hardening material 6 hardens.

[0046] According to the above configuration, the pusher rod 4 and the expansion fixation body 5 are positioned outside the bag-shaped sheet 3. Therefore, there is no need to insert the pusher rod 4 and the expansion fixation body 5 into the bag-shaped sheet 3 from its lower end during construction. Furthermore, there is no need to insert the bag-shaped sheet 3 when adding a segment to the pusher rod 4. This allows for efficient repair of the hollow columnar structure 1. Furthermore, the pusher rod 4 and the expansion fixation body 5 are not present inside the fluid hardener 6 (and thus the hardened product), which prevents a decrease in the strength (e.g., compressive strength and tensile strength) of the hardened product due to the presence, deterioration, and volumetric deformation of the pusher rod 4 and the expansion fixation body 5. Furthermore, because the pusher rod 4 is retrieved from the inside of the hollow columnar structure 1, it can be reused as long as strength and other factors remain intact. This also offers cost advantages.

[0047] In the method for reinforcing a hollow columnar object 1 disclosed herein, the pushing rod 4 and, if necessary, at least one of the injection tube 7 and the vinyl hose 8 can be recovered and reused. Therefore, the present disclosure can provide a reinforcing kit for 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 modifications. For example, the above-described embodiments have been described in detail to clearly explain the present disclosure, and are not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

[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. Those skilled in the art who have access to this disclosure will be able to 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 molding a high Young's modulus sheet into a cylindrical shape and sealing the top and bottom ends of the bag-shaped sheet, and an injection pipe for a fluid hardening material is connected to the folded portion where the sheet is stored by folding it in half along the long side direction, and the bag-shaped sheet, and a vinyl hose is connected to the outlet and extends to the bottom of the bag-shaped sheet. An expansion fixture for holding the sheet is connected to the surface of the top of the bag-shaped sheet, and a connecting member for a pusher rod for inserting the sheet into the hollow column is provided on the surface of the top of the fixture. Furthermore, after the bag-shaped sheet is held in place, the pusher rod is separated from the connecting member and pulled out of the hollow column. This fiber-reinforced concrete reinforcement material for hollow columns is characterized in that [Configuration 2] The bag-shaped sheet is a sheet knitted by impregnating a certain amount of thermosetting resin or thermoplastic resin into the fibers of a woven fabric in which a predetermined number of untwisted or twisted fiber bundles each having a high Young's modulus are bundled together with a weft, and is a fiber-reinforced concrete reinforcement material for a hollow columnar object according to the above-mentioned configuration 1. [Configuration 3] The fiber-reinforced concrete reinforcement material for hollow columns according to the above-mentioned configuration 1 or 2, wherein the bag-shaped sheet has a folding portion where the sheet is folded in half evenly along the long side direction and stored. [Configuration 4] 4. A fiber-reinforced concrete reinforcement material for a hollow column according to any one of the above configurations 1 to 3, wherein 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 along the long side direction of the surface of the bag-shaped sheet according to the length of insertion, and the tip of the push rod is formed with a male or female screw, and the connecting member is formed with a female or male screw, 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 a reverse direction to separate from the connecting member and pull out of the hollow column.A fiber-reinforced concrete reinforcement material for a hollow column according to 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 arranged so as to pass through 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 connected to one outlet of the T-shaped injection pipe by a plastic belt, a metal belt, an adhesive, or both, and is arranged so as to extend to the bottom of the bag-shaped sheet. [Configuration 7] The expansion fixture encloses a latex or film balloon, and an air tube for injecting air is connected to the balloon, which communicates with the top of the bag-like sheet, passes through the hollow part of the bag-like sheet, and is disposed outside the sheet from the communicating 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. A fiber-reinforced concrete reinforcement material for a hollow columnar object according to any one of the above configurations 1 to 6. [Configuration 8] 8. A fiber-reinforced concrete reinforcement material for a 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 drilled in the hollow column, and is knitted in a shape that does not cause any cross-sectional defects. The bag-shaped sheet 3 is made by molding a high Young's modulus sheet into a cylindrical shape and sealing its top and bottom ends. A folded portion 12 where the sheet is stored folded in half along the long side is connected to an injection pipe 7 for a fluid hardener 6, and a vinyl hose 8 is connected to the discharge outlet and extends 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 that inserts the bag-shaped sheet into the hollow column is provided on the surface of the top of the expansion fixture. After the sheet is held in place, the push rod 4 is separated from the connecting member 10 and pulled out of the hollow column. [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 member 11 Air tube 12 Oribe 13 Tip cap 14 Push rod connection part 20 Fiber-reinforced concrete reinforcement material (reinforcement material for hollow columns)

Claims

1. A reinforcing member for a hollow column, A hollow columnar bag-like 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, which expands 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; Equipped with The reinforcing member for a hollow columnar object, wherein 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.

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 into the woven fabric and hardened. The reinforcing member for a hollow pillar according to claim 1 .

3. Before the fluid hardening material is injected, the bag-shaped sheet is folded flat into a cylindrical body corresponding to the hollow of the hollow columnar object, 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 push rod is made of a flexible resin material or metal material. The reinforcing member for a hollow pillar according to claim 1 .

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

6. the expansion fixture 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 along the longitudinal direction. The reinforcing member for a hollow pillar according to claim 1 .

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

8. the injection pipe member has a T-shaped flow path consisting of a first flow path that communicates the inside and outside of the bag-shaped sheet, a second flow path that communicates with the first flow path and extends along the longitudinal direction of the bag-shaped sheet toward the one end, and a third flow path that extends toward the other end, the third flow path has a length that reaches the vicinity of the 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 7.

9. A reinforcing kit for reinforcing a hollow column, comprising: A hollow columnar bag-like sheet; an expansion fixing body provided at one end of the bag-shaped sheet, which expands to fix the bag-shaped sheet inside the hollow columnar object; a connecting member that detachably connects the expansion fixing body and the tip of a pushing rod for inserting the bag-shaped sheet into the hollow columnar object; Equipped with The bag-shaped sheet has one end sealed by a plate-shaped partition wall and is fixed to the expansion fixture via the partition wall, in this reinforcement kit for a hollow columnar object.

10. A reinforcing member for a hollow column, A hollow columnar bag-like 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, which expands 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, a step of inserting a reinforcing member for the hollow columnar object into the hollow portion through a hole 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 pusher rod from the hollow columnar reinforcing member and recovering it from the hollow portion; and Injecting a fluid hardening material into the bag-shaped sheet; Including, The bag-shaped sheet has one end sealed by a plate-shaped partition wall and is fixed to the expansion fixing body via the partition wall.

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