Reinforcement method for high-back hollow struts

Abstract

Provided is a reinforcing method that facilitates insertion of a reinforcing material into the inner side of the cylindrical wall of a high-back hollow column, movement inside the cylindrical wall, and maintenance at the reinforcement location. 【Solution means】 The reinforcing method for a high-back hollow column according to the present invention prepares a reinforcing material for reinforcing the cylindrical wall of the high-back hollow column to be reinforced from the inside, drills an insertion hole for inserting the reinforcing material into the inside of the cylindrical wall of the high-back hollow column, drills a hanging hole above the reinforcement location of the high-back hollow column, fixes a fixed pulley above the hanging hole, inserts one of a pair of hanging strips hanging down through the fixed pulley into the hanging hole and engages it with the reinforcing material, inserts the reinforcing material through the insertion hole, pulls the other of the pair of hanging strips to lift the reinforcing material, moves the lifted reinforcing material to the reinforcement location and maintains it, and fills the maintained reinforcing material with a filling material.

Description

Technical Field

[0001] The present invention relates to a reinforcement method for reinforcing the cylindrical wall of a high-back hollow column such as a concrete hollow column used as a utility pole or a signal pole, or a steel hollow column used as a pile pier or a pier column from the inside. In the present application, the "high-back hollow column" refers to a hollow column having a height such that the hand of a reinforcement worker cannot reach the upper end of the reinforcement portion without using tools or machinery.

Background Art

[0002] Conventionally, as a reinforcement method for a high-back hollow column, as shown in Patent Document 1 below, a bag-shaped reinforcing material is inserted and fixed inside the cylindrical wall of the high-back hollow column, and a filler made of a cement-based material such as cement mortar is filled in the reinforcing material and cured, so that the high-back hollow column to be reinforced is made solid, and a method of reinforcing the cylindrical wall of the high-back hollow column from the inside is known.

[0003] In the conventional reinforcement method, when inserting the reinforcing material inside the cylindrical wall of the high-back hollow column, an insertion hole is drilled within the reach of the worker's hand on the cylindrical wall, and the reinforcing material is inserted through the insertion hole, and while pushing the inserted reinforcing material with a pushing rod, it is moved to the reinforcement portion.

[0004] Also, in the conventional reinforcement method, in order to maintain the position of the reinforcing material moved to the reinforcement portion, it is necessary to inflate and stretch a balloon inside the cylindrical wall. Especially when the filler filled in the reinforcing material is heavy like a cement-based material, it becomes difficult to maintain the position inside the cylindrical wall, and it is necessary to adhere the outer peripheral surface of the reinforcing material and the inner peripheral surface of the cylindrical wall with an adhesive.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] As in the conventional reinforcement method, the method of inserting a reinforcing material inside the cylindrical wall of a high-back hollow column and pushing up the movement of the inserted reinforcing material to the reinforcement location with a pushing rod has a problem that the direction of the force applied by the operator is likely to become unstable, and it may slip sideways or lose balance, resulting in heavy labor.

[0007] In addition, in order to maintain the position of the reinforcing material moved to the reinforcement location, an expansion fixing body such as a balloon is required, and depending on the weight of the filling material, adhesion with an adhesive is required to prevent slipping.

Means for Solving the Problems

[0008] The present invention provides a reinforcement method that facilitates the insertion of a reinforcing material inside the cylindrical wall of a high-back hollow column and the movement inside the cylindrical wall, and also facilitates the maintenance at the reinforcement location.

[0009] In addition, it provides a reinforcement method that can arrange the reinforcing material along the reinforcement location in an appropriate posture and realize reliable reinforcement.

[0010] Specifically, the reinforcement method for a high-back hollow column according to the present invention includes the following steps A to H, thereby facilitating the insertion of the reinforcing material inside the cylindrical wall, the movement inside the cylindrical wall, and the maintenance of the position. In addition, the reinforcing material can be arranged at the reinforcement location in an appropriate posture. A: Prepare a reinforcing material for reinforcing the cylindrical wall of the high-back hollow column to be reinforced from the inside. B: Drill an insertion hole for inserting the reinforcing material inside the cylindrical wall of the high-back hollow column. C: Drill a suspension hole above the reinforcement location of the high-back hollow column. D: Fix a fixed pulley above the suspension hole. E: Insert one of a pair of suspension strips hanging through the fixed pulley into the suspension hole and engage it with the reinforcing material. F: Insert the reinforcing material through the insertion hole, and pull the other one of the pair of suspension strips to lift the reinforcing material. G: Move and hold the lifted reinforcing material to the reinforcement location. H: Fill the held reinforcing material with a filling material.

[0011] Preferably, by drilling the suspension hole in the cylinder wall and drilling the insertion hole in the cylinder wall below the suspension hole, the insertion of the reinforcing material can be efficiently performed.

[0012] Also, by configuring the lower end of the suspension hole drilled in the cylinder wall to be inclined downward from the outer peripheral surface to the inner peripheral surface of the cylinder wall, the suspension strip can be smoothly guided and the wear of the suspension strip can be prevented.

[0013] Also, by fixing the fixed pulley to a rod protruding from the outer peripheral surface of the cylinder wall, the fixed pulley can be fixed with a simple structure.

[0014] Preferably, by using the step bolt provided on the high-back hollow column as the rod, the fixed pulley can be fixed more simply.

[0015] More preferably, by drilling the suspension hole directly below the step bolt, when the high-back hollow column is made of concrete, the suspension hole can be easily drilled at a location where there is no reinforcing bar embedded in the concrete constituting the cylinder wall.

[0016] Also, in the present invention, the suspension hole can be drilled at the upper end of the high-back hollow column and used as a hole also serving as the insertion hole. Thereby, the operation of drilling two types of holes can be omitted, and the insertion and movement of the reinforcing material can be performed simultaneously, making the operation easier.

[0017] Preferably, a gable part is erected at the upper end of the high-back hollow column, and the fixed pulley is fixed to the gable part, so that the reinforcing material can be reliably suspended.

[0018] More preferably, by fixing and erecting the gable part to the step bolt provided on the high-back hollow column, the fixed pulley can be reliably fixed with a simple structure.

[0019] Further, as the reinforcing material, a bag-shaped member formed by molding a synthetic resin fiber sheet into a bag shape can be used.

[0020] Alternatively, as the reinforcing material, by using a reinforcing material composed of a bag-shaped member having water retention on its outer peripheral surface and a cylindrical member having water permeability covering the outer peripheral surface of the bag-shaped member, the cylindrical member can be firmly integrated with the inner peripheral surface of the cylinder wall.

[0021] Preferably, the cylindrical member can be composed of a synthetic resin fiber sheet formed by connecting a plurality of warp threads made of synthetic resin fibers with gaps for water passage.

[0022] Further, the bag-shaped member can be formed by molding a water retention sheet into a bag shape. Alternatively, the bag-shaped member can be formed by molding a non-water-permeable sheet or a non-air-permeable sheet into a bag shape and covering its outer peripheral surface with a water retention sheet.

Effects of the Invention

[0023] According to the method for reinforcing a high-back hollow column according to the present invention, it is possible to easily insert a reinforcing material inside the cylinder wall of the high-back hollow column to be reinforced, and to easily move and maintain the position of the inserted reinforcing material.

[0024] In addition, the reinforcing material can be arranged along the reinforcing portion in an appropriate posture, and reliable reinforcement can be achieved.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0026] The optimal embodiment of the reinforcing method for the high-back hollow column according to the present invention will be described based on FIGS. 1 to 9.

[0027] <Basic Configuration of Reinforcing Method> As shown in FIGS. 6 and 9, the reinforcing method according to the present invention is a reinforcing method using a reinforcing member 1 for reinforcing the cylindrical wall 12 of the high-back hollow column 11 to be reinforced from the inside, and by filling a filling material f into the reinforcing member 1 along the reinforcing portion R, it relates to a method of strongly adhering the outer peripheral surface 1a of the reinforcing member 1 to the inner peripheral surface 12a of the cylindrical wall 12 to achieve reinforcement.

[0028] Note that the high-back hollow column 11 to be reinforced by the reinforcing material 1 according to the present invention may be made of concrete or steel, and the hollow cylindrical structure is not limited to a cylindrical shape, and may be an elliptical cylindrical shape, a polygonal cylindrical shape, or the like. However, the high-back hollow column has a height such that the upper end of the reinforcement portion cannot be reached by the reinforcement worker without using machinery or tools. In other words, the high-back hollow column having a height such that the reinforcing material 1 cannot be arranged at an appropriate position without using machinery or tools is targeted. For example, a low-back hollow column such as a guardrail column is not targeted.

[0029] In addition, GL in FIGS. 3 to 9 represents the ground, and FIGS. 3 to 9 illustrate a state in which the reinforcing material 1 is arranged so as to extend from the upper part to the lower part of the ground GL for reinforcement.

[0030] ≪Reinforcing material 1≫ In the present invention, as shown in FIG. 1, as the reinforcing material 1, it is desirable to use a reinforcing material 1 composed of a bag-shaped member 2 having a water-retaining outer peripheral surface portion 2a and a cylindrical member 3 having water permeability and covering the outer peripheral surface portion 2a of the bag-shaped member 2. By filling the filling material f into the bag-shaped member 2, the cylindrical member 3 is brought into close contact with the inner peripheral surface 12a of the cylinder wall 12, and at the same time, the adhesive impregnated in the outer peripheral surface portion 2a of the bag-shaped member 2 is allowed to ooze out, so that the cylindrical member 3 and the bag-shaped member 2 and the cylinder wall 12 can be integrated to achieve reinforcement.

[0031] In addition, 8 in FIG. 1 is a vent for air bleeding to make filling smooth when the filling material f is a liquid such as water or a cement-based material, and 9 is a filling port for filling the filling material f.

[0032] The bag-shaped member 2 is literally a bag-shaped member, and by filling the inside with a filling material, it has an outer peripheral surface portion 2a that swells to a size that closely adheres to the inner peripheral surface 12a of the cylinder wall 12 of the high-back hollow column 11 to be reinforced.

[0033] As shown in Fig. 1, as the bag-shaped member 2, a bag-forming sheet S3 made of a water-impermeable sheet or an air-impermeable sheet is formed into a cylinder, the upper end portion S3a and the lower end portion S3b are closed to form a bag shape, and the outer peripheral surface portion thereof is covered with a water-retaining sheet S1 to form a double structure, whereby water retention can be imparted to the outer peripheral surface portion 2a. Preferably, as shown in Fig. 1, the upper end portion S1a of the water-retaining sheet S1 protrudes upward beyond the upper end portion S2a of the water-permeable sheet S2 described later. Similarly, the lower end portion S1b of the water-retaining sheet S1 protrudes downward beyond the lower end portion S2b of the water-permeable sheet S2 described later. This is to ensure that the water-permeable sheet S2 described later is embedded in the adhesive layer.

[0034] As the water-retaining sheet S1, in addition to a non-woven fabric sheet, a sheet having a porous structure such as a paper sheet, a wooden sheet, a cloth sheet, or a foamed sheet can be used, so that as much of the uncured adhesive (liquid adhesive) as possible can be impregnated, and the impregnated adhesive can be appropriately exuded during compression. Preferably, if a non-woven fabric sheet is used, not only water retention but also the bag-shaped member 2 can be constituted only by the water-retaining sheet S1, and it is also possible to hold a cement-based material as a filler.

[0035] Further, when a water-impermeable sheet is used as the bag-forming sheet S3, there is no particular limitation as long as it can prevent the passage of liquids, especially water. However, a nylon sheet, a polyvinyl chloride sheet, a polyethylene sheet, a polypropylene sheet, and an acrylic urethane sheet are preferable because they are easy to mold and strong. When the bag-shaped member 2 is constituted by using the bag-forming sheet S3 which is a water-impermeable sheet, a simple liquid such as water which does not harden like a cement-based material can be used as a filler.

[0036] When using an airtight sheet as the sheet S3 for forming the bag, there is no particular limitation as long as it can prevent the passage of gas, especially air. However, a nylon sheet, a polyvinyl chloride sheet, a polyethylene sheet, a polypropylene sheet, or an acrylic urethane sheet is preferable because it is easy to mold and durable. When forming the bag-shaped member 2 using the airtight sheet S3 as the sheet for forming the bag, a simple gas such as air that does not harden like a cement-based material can be used as the filler.

[0037] In the present invention, the cylindrical member 3 is characterized by having water permeability in order to allow the adhesive impregnated in the outer peripheral surface portion 2a of the bag-shaped member 2 described above to reach the cylindrical wall 12 of the high-back hollow column 11. Therefore, it is formed by molding the water-permeable sheet S2 into a cylindrical shape.

[0038] The water-permeable sheet S2 needs to be a sheet that can allow a liquid, particularly a liquid adhesive, to pass through and can be embedded in the cured adhesive layer to reinforce the tensile strength from the inside of the cylindrical wall 12. As the water-permeable sheet S2, it is desirable to use a synthetic resin fiber sheet formed by knitting or weaving known synthetic resin fibers such as ultra-high density polyethylene fibers, aramid fibers, carbon fibers, and polyester fibers, with appropriate gaps for water passage provided.

[0039] As the water-permeable sheet S2, in particular, as shown in FIG. 2, a synthetic resin fiber sheet formed by connecting a plurality of warp threads 4 made of synthetic resin fibers with weft threads 5 while leaving gaps 6 for water passage, in other words, mainly using the warp threads 4 extending in the vertical direction and having a "yoshi-zu-shaped sheet" with appropriate gaps 6, is desirable. Note that it is desirable to use a fiber bundle in which a large number of synthetic resin fibers are bundled as the warp threads 4 in order to ensure strength.

[0040] According to the reinforcing material 1 described above, by filling the filler f into the bag-shaped member 2, the cylindrical member 3 (the outer peripheral surface 1a of the reinforcing material 1) is brought into close contact with the inner peripheral surface 12a of the cylindrical wall 12, and at the same time, the adhesive impregnated in the outer peripheral surface portion 2a of the bag-shaped member 2 is allowed to ooze out, and the cylindrical member 3 and the bag-shaped member 2 and the cylindrical wall 12 can be integrated to achieve reinforcement.

[0041] That is, by imparting water retention to the outer peripheral surface portion 2a of the bag-shaped member 2, the outer peripheral surface portion 2a can be impregnated with as much liquid adhesive as possible. At the same time as pressing the cylindrical member 3 against the inner peripheral surface 12a of the cylindrical wall 12, the required amount of adhesive can be reliably supplied.

[0042] As the adhesive, known liquid adhesives such as epoxy adhesives and acrylic urethane adhesives can be used. Preferably, if an epoxy-based adhesive is used, for example, even when moisture from the cement-based material leaks out from the bag-shaped member 2, the adhesive strength will not be inhibited. Also, it can be appropriately adjusted according to the material of the high-back hollow column to be reinforced.

[0043] In the present invention, as the reinforcing material 1, those obtained by simply molding a synthetic resin fiber sheet or a non-woven fabric sheet into a bag shape, which have been used in conventional reinforcing methods, are used, and filling the reinforcing material 1 with a cement-based material is not excluded.

[0044] <Specific steps of the reinforcement method> Hereinafter, the steps of the reinforcement method according to the present invention will be specifically described.

[0045] ≪Reinforcing material preparation step≫ In this step, first, the outer peripheral surface portion 2a of the bag-shaped member 2 is impregnated with an adhesive. As a method of impregnation, it can be carried out by applying an adhesive to the outer peripheral surface portion 2a using a known coating method such as brush coating, roller coating, or spray coating. In particular, when coating with a roller called a defoaming roller that can remove air bubbles in the coating material, the outer peripheral surface portion 2a of the bag-shaped member 2 can be effectively impregnated with the adhesive. Considering the weights of the reinforcing material 1 and the filling material f, the material of the cylindrical wall 12, etc., the coating amount can be appropriately adjusted.

[0046] After the above adhesive impregnation, the outer peripheral surface portion 2a of the bag-shaped member 2 impregnated with the adhesive is covered with the cylindrical member 3 and set as the reinforcing material 1 composed of the bag-shaped member 2 and the cylindrical member 3.

[0047] <<Drilling Process for Insertion Hole and Hanging Hole>> As shown in Fig. 3, an insertion hole h1 for inserting a reinforcing material 1 inside the cylindrical wall 12 is drilled in the cylindrical wall 12 of the high-back hollow column 11. The insertion hole h1 is preferably in the shape of a long hole to facilitate the insertion of the reinforcing material 1. Also, the height at which the insertion hole h1 is drilled is not particularly limited, but it can be appropriately drilled at a height convenient for the operator of the reinforcement work, and it is also possible to drill it within the range of the reinforcement location R. Further, it is desirable to drill the insertion hole h1 below the hanging hole h2 described later. This is to efficiently insert the reinforcing material 1.

[0048] Also, a hanging hole h2 for guiding a hanging strip 21 for hanging the reinforcing material 1 is also drilled in the cylindrical wall 12. It is desirable to drill the hanging hole h2 above the reinforcement location R. This is to finally approach the reinforcing material 1 hung using the hanging hole h2 from above and guide it to an accurate position with respect to the reinforcement location R.

[0049] Preferably, when the high-back hollow column 11 is made of concrete and step bolts 14 are previously erected on the cylindrical wall 12, the hanging hole h2 is drilled directly below the step bolts 14. Such step bolts 14 are provided as a scaffold for the inspection operator and are fixed through the cylindrical wall 12. Therefore, the location where the step bolts 14 are erected is a location where there are no reinforcing bars embedded in the constituent concrete of the cylindrical wall 12 throughout the entire vertical direction. Thus, if it is directly below the provided step bolts 14, since there are no embedded reinforcing bars, the hanging hole h2 can be easily drilled.

[0050] As shown in Fig. 4, preferably, the lower end portion h2a of the suspension hole h2 is configured to slope downward from the outer peripheral surface 12b to the inner peripheral surface 12a of the cylindrical wall 12. This is to smoothly guide the suspension strip 21 and to prevent the suspension strip 21 from being worn out by making the sharp corner of the hole edge that the suspension strip 21 contacts when it reciprocates into an obtuse angle. The inclination angle θ of the lower end portion h2a of the suspension hole h2 in Fig. 4 is preferably 45 degrees to 60 degrees. Note that the upper end portion h2b of the suspension hole h2 may be configured to slope downward in the same manner as the lower end portion h2a as shown in Fig. 4(A), or may be horizontal as shown in Fig. 4(B). However, making it horizontal can further reduce the possibility of damaging the suspension strip 21.

[0051] In addition, the insertion hole h1 and the suspension hole h2 are preferably arranged so that they face each other while changing the levels up and down rather than being arranged linearly side by side in the vertical direction as shown in Fig. 3. This is because the direction of the force applied to the reinforcing member 1 for insertion from the insertion hole h1 and the direction of the force pulling the reinforcing member 1 with the suspension strip 21 extending from the suspension hole h2 are likely to coincide, making the insertion operation easier.

[0052] Also, a filling hole h3 for passing the air vent pipe 22 and the filling pipe 23 described later can be formed in the cylindrical wall 12. Preferably, it is formed above the reinforced portion R and below the suspension hole h2. The filling pipe 23 etc. may be passed through the above-described insertion hole h1 or suspension hole h2, but providing a dedicated hole makes the filling operation easier and also allows an endoscope camera to be inserted to check the filling state. Also, it is optional to form a dedicated hole for passing the air vent pipe 22 separately from the filling hole h3 according to the implementation.

[0053] In the present invention, as described above, in addition to providing the insertion hole h1 and the suspension hole h2 in the cylinder wall 12, as shown in FIG. 7, the insertion hole h1 and the suspension hole h2 can be drilled in the upper end portion 11a of the high-back hollow column 11. That is, as shown in FIG. 7, the top wall 13 of the upper end portion 11a of the high-back hollow column 11 can be removed, or specifically, although not shown in the figure, a hole can be drilled in the top wall 13, and the opened portion can be used as the insertion hole h1 and the suspension hole h2. Thereby, the insertion operation and the moving operation can be performed simultaneously, and the work efficiency can be improved.

[0054] <<Fixed pulley fixing step>> Next, a fixed pulley 20 is fixed above the suspension hole h2 (the shaft of the fixed pulley 20 is fixed). When the suspension hole h2 is provided in the cylinder wall 12 of the high-back hollow column 11, as shown in FIG. 3, the provided step bolt 14 is used to fix the fixed pulley 20 above the suspension hole h2. When fixing the fixed pulley 20, as long as the fixed pulley 20 can be suspended and fixed, it is not limited to the step bolt 14, and it is also optional according to the implementation to project a bar on the cylinder wall 12 and use it. However, in the case of the step bolt 14, it is often provided in advance on the high-back hollow column 11, and the fixed pulley fixing work can be reduced.

[0055] Also, when the suspension hole h2 is provided in the upper end portion 11a of the high-back hollow column 11, as shown in FIG. 7, a gantry portion 24 can be erected and the fixed pulley 20 can be fixed directly above the suspension hole h2. The gantry portion 24 has a support portion 24a and an arm portion 24b. The arm portion 24b can be fixed at a high position by the support portion 24a, and the fixed pulley 20 can be suspended and fixed by the arm portion 24b.

[0056] The gantry portion 24 can be easily attached if it is provided via the step bolt 14 provided on the high-back hollow column 11. In the present invention, as long as the fixed pulley 20 can be fixed above the suspension hole h2, it is not limited to providing the gantry portion 24, and it is also optional according to the implementation to fix the fixed pulley 20 using a structure other than the high-back hollow column 11.

[0057] In addition, in the present invention, not only one fixed pulley 20 is provided, but also a plurality of fixed pulleys 20 can be provided for combination with a movable pulley without being excluded.

[0058] ≪Reinforcing Material Insertion and Movement Step≫ This step is a step of inserting the reinforcing material 1 set in the above-described reinforcing material preparation step, that is, the reinforcing material 1 composed of the bag-shaped member 2 covered with the cylindrical member 3 in this embodiment, inside the cylindrical wall 12 of the high-back hollow column 11 and moving it to the reinforcing portion R.

[0059] First, one of the pair of hanging strips 21 hanging down through the fixed pulley 20 is inserted into the hanging hole h2 so as to penetrate the hanging hole h2, and is engaged with the reinforcing material 1 via the engaging means 10. The engaging means 10 is not particularly limited as long as it can be appropriately engaged with the reinforcing material 1 even after the filling material f is filled, and known engaging means such as a hanging string, a hook, a carabiner, etc. can be used. Further, the hanging strip 21 is not particularly limited as long as it can appropriately hang the reinforcing material 1 filled with the filling material f, and in addition to a metal strip such as a known wire, a synthetic resin strip or the like can be used.

[0060] Next, the reinforcing material 1 is inserted through the insertion hole h1, and the other of the pair of hanging strips 21 hanging down through the fixed pulley 20 is pulled to lift the reinforcing material 1. At this time, since the operator only needs to pull the hanging strip 21, the direction of the applied force is stable and the work can be easily performed. Further, the lifted reinforcing material 1 is in a posture of hanging straight down in the vertical direction and there is no risk of being twisted or tilted.

[0061] When the insertion hole h1 is provided in the cylindrical wall 12 of the high-back hollow column 11, as shown in FIG. 3, while pushing the reinforcing material 1 through the insertion hole h1, it is pulled with the hanging strip 21 to guide the reinforcing material 1 inside the cylindrical wall 12. When the entire reinforcing material 1 has entered the inside of the cylindrical wall 12, as shown in FIG. 5, the reinforcing material 1 is hung down to a position corresponding to the reinforcing portion R, and when it is moved to a position appropriately along the reinforcing portion R, the reinforcing material 1 is maintained at that position as it is.

[0062] Or, when the insertion hole h1 is provided at the upper end portion 11a of the high-back hollow column 11, as shown in FIG. 7, the reinforcing member 1 is lifted from the ground GL via the hanging strip 21, and is inserted into the insertion hole h1 from the lower end portion of the reinforcing member 1. As described above, since the insertion hole h1 also serves as the hanging hole h2, the insertion operation and the moving operation can be performed simultaneously by simply hanging the reinforcing member 1. As shown in FIG. 8, when the reinforcing member 1 is moved to a position appropriately along the reinforcing portion R, it is maintained at that position as it is.

[0063] In the present invention, by hanging the reinforcing member 1, the reinforcing member 1 can be surely maintained at a position along the reinforcing portion R, so that an adhesion operation for preventing the slipping of the reinforcing member 1 is unnecessary.

[0064] ≪Filling material filling step≫ This step is a step of filling the filling material f into the reinforcing member 1 maintained inside the cylindrical wall 12 by the above-described reinforcing member insertion and moving steps, as shown in FIGS. 6 and 9. As described above, the filling material f such as a cement-based material, water, air, etc. can be filled through the filling port 9 provided in the bag-shaped member 2 of the reinforcing member 1. As will be described later, according to the reinforcing method of the present invention, the cylindrical wall 12 and the reinforcing member 1 can be integrated, and in particular, the cylindrical member 3 can reinforce the tensile strength of the cylindrical wall 12. Therefore, even if the filling material f does not harden like a cement-based material, that is, even if the high-back hollow column 11 is not made solid, appropriate reinforcement can be achieved.

[0065] When the filling material f is a gas such as air, the filling material f is filled into the bag-shaped member 2 through the filling pipe 23 and the filling port 9. Further, when the filling material f is a liquid such as a cement-based material, water, or warm water, the filling material f is filled into the bag-shaped member 2 through the filling pipe 23 and the filling port 9, and at the same time, the air remaining in the bag-shaped member 2 is removed through the air bleeding pipe 22 and the air bleeding port 8 to perform the filling operation efficiently.

[0066] Note that the filling tube 23, the filling port 9, the air vent tube 22, and the air vent port 8 are not particularly limited as long as they can transfer the filling material f and air without leakage, and known tubular members such as hoses can be used.

[0067] <<Adhesive Infiltration Step>> In this step, while pressing the cylindrical member 3 against the inner peripheral surface 12a side of the cylindrical wall 12 with the bag-shaped member 2 inflated by the above-described filling material filling step, the adhesive impregnated in the outer peripheral surface portion 2a of the bag-shaped member 2 is made to ooze out through the cylindrical member 3. By this step, a sufficient amount of adhesive can be supplied to surely form an adhesive layer.

[0068] <<Adhesive Curing Step>> This step is a step of curing the adhesive that has oozed out by the above-described adhesive infiltration step. Thereby, the cylindrical member 3 can be embedded in the adhesive layer formed between the outer peripheral surface portion 2a of the bag-shaped member 2 and the inner peripheral surface 12a of the cylindrical wall, and a strong reinforcing structure can be constructed.

[0069] And after the above-described adhesive has cured, the engagement state between the reinforcing member 1 and the suspension strip 21 is released, and the suspension strip 21 is recovered. When the filling material f is a cement-based material, it goes without saying that the engagement state between the reinforcing member 1 and the suspension strip 21 is released after confirming the curing of the filling material f.

[0070] Note that in the present invention, when the filling material f does not harden such as air or water, the bag-forming sheet (non-water-permeable sheet or non-air-permeable sheet) S3 constituting the bag-shaped member 2 is coated to prevent adhesion by the adhesive, and can be recovered after the adhesive has cured. Thereby, members that do not directly participate in the reinforcing structure can be recovered.

Explanation of Reference Numerals

[0071] 1…Reinforcing material, 1a…Outer peripheral surface, 2…Bag-shaped member, 2a…Outer peripheral surface portion, 3…Cylindrical member, 4…Warp, 5…Weft, 6…Water passage gap, 8…Air vent, 9…Filling port, 10…Engaging means, 11…High-back hollow column, 11a…Upper end portion, 12…Cylindrical wall, 12a…Inner peripheral surface, 12b…Outer peripheral surface, 13…Ceiling wall, 14…Step bolt, 20…Fixed pulley, 21…Suspension strip, 22…Air vent pipe, 23…Filling pipe, 24…Rack portion, 24a…Column portion, 24b…Arm portion, S1…Water retention sheet, S1a…Upper end portion, S1b…Lower end portion, S2…Water permeable sheet, S2a…Upper end portion, S2b…Lower end portion, S3…Bag forming sheet, S3a…Upper end portion, S3b…Lower end portion, f…Filling material, GL…Ground, h1…Insertion hole, h2…Suspension hole, h2a…Lower end portion, h2b…Upper end portion, h3…Filling hole, R…Reinforcement location.

Claims

1. A method for reinforcing a high-back hollow column, characterized by comprising the following steps A to H. A: Prepare a reinforcing material for reinforcing the cylindrical wall of the high-back hollow column to be reinforced from the inside. B: Drill an insertion hole for inserting the reinforcing material into the inside of the cylindrical wall of the high-back hollow column. C: Drill a suspension hole above the reinforcing portion of the high-back hollow column. D: Fix a fixed pulley above the suspension hole. E: Insert one of a pair of suspension strips hanging through the fixed pulley into the suspension hole and engage with the reinforcing material. F: Insert the reinforcing material through the insertion hole, and pull the other of the pair of suspension strips to lift the reinforcing material. G: Move and maintain the lifted reinforcing material to the reinforcing portion. H: Fill the maintained reinforcing material with a filling material.

2. The method for reinforcing a high-back hollow column according to claim 1, wherein the suspension hole is drilled in the cylindrical wall, and the insertion hole is drilled in the cylindrical wall below the suspension hole.

3. The method for reinforcing a high-back hollow column according to claim 2, wherein the lower end of the suspension hole drilled in the cylindrical wall is inclined downward from the outer peripheral surface to the inner peripheral surface of the cylindrical wall.

4. The method for reinforcing a high-back hollow column according to claim 2, wherein the fixed pulley is fixed to a rod protruding from the outer peripheral surface of the cylindrical wall.

5. The method for reinforcing a high-back hollow column according to claim 4, wherein the rod is a step bolt provided on the high-back hollow column.

6. The method for reinforcing a high-back hollow column according to claim 5, wherein the suspension hole is drilled directly below the step bolt.

7. The method for reinforcing a high-back hollow column according to claim 1, wherein the suspension hole is drilled at the upper end of the high-back hollow column and used as a hole also serving as the insertion hole.

8. The method for reinforcing a high-back hollow column according to claim 7, wherein a gantry portion is erected at the upper end of the high-back hollow column, and the fixed pulley is fixed to the gantry portion.

9. The method for reinforcing a high-back hollow column according to claim 8, wherein the gantry portion is fixed and erected on a step bolt provided on the high-back hollow column.

10. The method for reinforcing a high-back hollow column according to claim 1, wherein the reinforcing material is a bag-shaped member formed by molding a synthetic resin fiber sheet into a bag shape.

11. The reinforcing method of the high-back hollow column according to claim 1, characterized in that the reinforcing material comprises a bag-shaped member having a water-retaining outer peripheral surface portion and a cylindrical member having water permeability and covering the outer peripheral surface portion of the bag-shaped member.

12. The reinforcing method of the high-back hollow column according to claim 11, characterized in that the cylindrical member is made of a synthetic resin fiber sheet formed by connecting a plurality of warp threads made of synthetic resin fibers with gaps for water passage.

13. The reinforcing method of the high-back hollow column according to claim 11, characterized in that the bag-shaped member is formed by molding a water-retaining sheet into a bag shape.

14. The reinforcing method of the high-back hollow column according to claim 11, characterized in that the bag-shaped member is formed by molding a non-water-permeable sheet or a non-breathable sheet into a bag shape and covering its outer peripheral surface portion with a water-retaining sheet.

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