Method for Reinforcing a Hollow Strut

Abstract

Provided are a reinforcing material that can be reliably adhered to the inner peripheral surface of the cylindrical wall of a hollow column, and a reinforcing method using the reinforcing material. 【Solution means】 The reinforcing material 1 of the hollow column according to the present invention is a reinforcing material that reinforces the cylindrical wall 12 of the hollow column 11 from the inside, and includes a bag-shaped member 2 having water retention on the outer peripheral surface portion, and a cylindrical member 3 having water permeability that covers the outer peripheral surface portion 2a of the bag-shaped member. By impregnating the outer peripheral surface portion 2a of the bag-shaped member 2 with a liquid adhesive before curing and allowing the impregnated adhesive to ooze out through the cylindrical member 3, it is possible to reliably supply an amount of adhesive necessary for strong adhesion.

Description

Technical Field

[0001] The present invention relates to a reinforcing material and a reinforcing method for reinforcing the cylindrical wall of a hollow column from the inside, such as a hollow column made of concrete used as a utility pole or a signal pole, a steel hollow column used as a guardrail post, a pile bridge pier, or a pier post of a pier.

Background Art

[0002] Conventionally, as a method for reinforcing a hollow column, as shown in Patent Document 1 below, a bag-shaped reinforcing material is inserted and fixed inside the cylindrical wall of the hollow column, and a filling material such as cement mortar is filled and cured in the bag-shaped reinforcing material, thereby making the hollow column solid and reinforcing the cylindrical wall of the hollow column from the inside. This method is known.

[0003] In these conventional reinforcing methods, it is important that the bag-shaped reinforcing material containing the filling material and the hollow column are integrated. For this purpose, it is necessary to strongly adhere the outer peripheral surface of the bag-shaped reinforcing material and the inner peripheral surface of the hollow column, and it is necessary to adhere considering the weight of the filling material filled in the bag-shaped reinforcing material. This adhesion is performed by an adhesive applied to the outer peripheral surface of the bag-shaped reinforcing material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The above-described conventional bag-shaped reinforcing material is configured by sewing together sheet materials formed by weaving synthetic resin fibers so that cement mortar or the like as a filling material does not leak and to exhibit a desired strength (Patent Document 1: paragraph

[0021] , etc.). The sheet material woven in this way does not have water retention, and it is difficult to appropriately apply an amount of adhesive necessary for reliable adhesion. Therefore, even if adhered, the bag-shaped reinforcing material may slip off due to the weight of the filling material or the like.

Means for Solving the Problems

[0006] The present invention provides a reinforcing material that can be reliably adhered to the inner peripheral surface of the cylindrical wall of a hollow column and a reinforcing method using the reinforcing material.

[0007] Specifically, the reinforcing method for a hollow column according to the present invention is a reinforcing method for reinforcing the cylindrical wall of a hollow column from the inside, and includes a bag-shaped member having an outer peripheral surface portion with water retention that can be impregnated with a liquid adhesive before curing, and a cylindrical member having water permeability that allows the passage of the above adhesive and covering the outer peripheral surface portion of the bag-shaped member. By using a reinforcing material composed of these and including the following steps A to F, the outer peripheral surface portion of the bag-shaped member is impregnated with a liquid adhesive before curing, and the impregnated adhesive is allowed to ooze out through the cylindrical member, so that an amount of adhesive necessary for strong adhesion can be reliably supplied. A: Impregnate the outer peripheral surface portion of the bag-shaped member in the above reinforcing material with an adhesive 、 B: Cover the outer peripheral surface portion impregnated with the adhesive with the above cylindrical member C: Insert the bag-shaped member covered with the cylindrical member into the cylindrical wall of the above hollow column D: Fill the bag-shaped member existing in the cylindrical wall with a filling material E: Expand the bag-shaped member and press the cylindrical member against the inner peripheral surface of the cylindrical wall of the hollow column while allowing the adhesive impregnated in the outer peripheral surface portion to ooze out through the cylindrical member F: Embed the cylindrical member in the adhesive layer formed between the outer peripheral surface of the bag-shaped member and the inner peripheral surface of the cylindrical wall by curing the oozed adhesive

[0008] Preferably, the cylindrical member is made of a synthetic resin fiber sheet formed by connecting a plurality of warp yarns made of synthetic resin fibers with a space for water passage. While being able to surely guide the adhesive to the inner peripheral surface of the cylindrical wall of the hollow column, in particular, the warp yarns can appropriately cope with the tensile stress applied to the hollow column.

[0009] Further, the bag-shaped member is formed by molding a water-retaining sheet into a bag shape. Alternatively, the bag-shaped member is formed by molding a non-water-permeable sheet into a bag shape and covering the outer peripheral surface thereof with a water-retaining sheet. In any case, water retention is imparted to the outer peripheral surface of the bag-shaped member, and a sufficient amount of adhesive can be impregnated.

[0010] As the water-retaining sheet, a non-woven fabric sheet is preferably used. As the non-water-permeable sheet, a nylon sheet is preferably used. As the airtight sheet, a rubber sheet is preferably used.

Advantages of the Invention

[0013] According to the reinforcing material and the reinforcing method of the hollow column according to the present invention, the reinforcing material can be surely integrated with the hollow column, and reliable reinforcement can be achieved.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0015] Optimal embodiments of the reinforcing material and the reinforcing method for the hollow support column according to the present invention will be described with reference to FIGS. 1 to 7.

[0016] <Basic Configuration> As shown in FIGS. 5 and 6, the reinforcing material 1 according to the present invention is a reinforcing material for reinforcing the cylindrical wall 12 of the hollow support column 11 to be reinforced from the inside. It is composed of a bag-shaped member 2 having a water-retaining outer peripheral surface portion 2a and a cylindrical member 3 having water permeability that covers 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 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 oozed out, and the cylindrical member 3 and the bag-shaped member 2 and the cylindrical wall 12 are integrated to achieve reinforcement.

[0017] Note that the hollow support 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. Also, GL in FIGS. 5 and 6 is the ground, and FIGS. 5 and 6 illustrate a state in which the reinforcing material 1 is arranged so as to extend from above the ground GL to below the ground GL to achieve reinforcement.

[0018] ≪Bag-shaped member 2≫ As shown in FIG. 1, 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 cylindrical wall 12 of the hollow support column 11 to be reinforced. Also, the length of the bag-shaped member 2 in the vertical direction (longitudinal direction), that is, for example, the length from the upper end portion S1a to the lower end portion S1b of the water-retaining sheet S1 described later can be appropriately adjusted according to the reinforcement location. Although not specifically shown, a filling port for filling the filling material can be provided at a desired location.

[0019] In the present invention, by imparting water retention to the outer peripheral surface portion 2a of the bag-shaped member 2, it is possible to impregnate the outer peripheral surface portion 2a with as much liquid adhesive as possible, and at the same time as pressing the cylindrical member 3 described later against the cylindrical wall 12 of the hollow column 11, it is possible to surely supply a necessary amount of adhesive.

[0020] In order to impart water retention to the outer peripheral surface portion 2a, as shown in FIG. 1, a water retention sheet S1 can be formed into a bag shape, and the bag-shaped member 2 itself can be formed of the water retention sheet S1. That is, the water retention sheet S1 is formed into a cylindrical shape similar to the internal space of the reinforcing portion of the hollow column 11, and the upper end portion S1a and the lower end portion S1b are sewn or adhered and closed to form the bag-shaped member 2.

[0021] Alternatively, as shown in FIG. 4, a bag-forming sheet S3 made of a sheet other than the water retention sheet, for example, a non-water-permeable sheet or a non-breathable sheet, is formed into a cylindrical shape, 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 the water retention sheet S1 to form a double structure, whereby water retention can be imparted to the outer peripheral surface portion 2a.

[0022] As the water retention 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 to impregnate as much liquid adhesive before curing as possible, and when compressed, the impregnated adhesive can be appropriately exuded. Preferably, when using a non-woven fabric sheet, not only water retention but also when the bag-shaped member 2 is constituted only by the water retention sheet S1, when a cement-based material such as cement mortar or concrete is used as a filler, the filler can be appropriately held.

[0023] In addition, when using a water-impermeable sheet as the bag-forming sheet S3, there is no particular limitation as long as it can prevent the passage of liquid. However, nylon sheets, polyvinyl chloride sheets, polyethylene sheets, polypropylene sheets, and acrylic urethane sheets are preferable because they are easy to form and durable. When the bag-shaped member 2 is configured using the bag-forming sheet S3 that is a water-impermeable sheet, a simple liquid such as water that does not harden like a cement-based material can be used as the filler.

[0024] In addition, when using an airtight sheet as the bag-forming sheet S3, there is no particular limitation as long as it can prevent the passage of gas, especially air. However, rubber sheets, polyvinyl chloride sheets, polyethylene sheets, polypropylene sheets, and acrylic urethane sheets are preferable because they are easy to form and durable. When the bag-shaped member 2 is configured using the bag-forming sheet S3 that is an airtight sheet, a simple gas such as air that does not harden like a cement-based material can be used as the filler.

[0025] 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 impaired. Also, it can be appropriately adjusted according to the material of the hollow support column to be reinforced.

[0026] ≪Cylindrical member 3≫ 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 above-described bag-shaped member 2 to reach the cylindrical wall 12 of the hollow support column 11. Therefore, it is formed by molding a water-permeable sheet S2 into a cylindrical shape.

[0027] The water-permeable sheet S2 should be a sheet that can allow liquids, especially liquid adhesives, to pass through and can be embedded in the cured adhesive layer 7 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 synthetic resin fibers such as known ultra-high density polyethylene fibers, aramid fibers, carbon fibers, and polyester fibers, and provided with appropriate gaps for water passage.

[0028] As the water-permeable sheet S2, in particular, as shown in FIG. 3, 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 water passage intervals 6, in other words, it is desirable to use a "yoshizu-shaped sheet" mainly composed of warp threads 4 extending in the vertical direction during use and having appropriate gaps 6. As shown in FIG. 7(A), when embedded in the adhesive layer 7 and integrated with the cylindrical wall 12, the warp threads 4 extend straight in the vertical direction, so it is easier to exert tensile strength. On the other hand, as shown in FIG. 7(B), in a synthetic resin sheet formed by weaving synthetic resin fibers, which has also been used conventionally, the warp threads 8 meander due to being woven with the weft threads 9, and effective tensile strength cannot be expected. In addition, it is desirable to use a fiber bundle in which a large number of synthetic resin fibers are bundled as the warp threads 4 to ensure strength.

[0029] <Reinforcement method> A reinforcement method using the reinforcing material 1 according to the present invention described above will be described. The reinforcement method according to the present invention is characterized by comprising the following steps.

[0030] ≪Adhesive impregnation 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 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 adjusted as appropriate.

[0031] <<Cylindrical member covering process>> This process is a process of covering the outer peripheral surface portion 2a of the bag-shaped member 2 impregnated with the adhesive with the cylindrical member 3 as shown in FIGS. 2 and 4 after the above adhesive impregnation process. In this process, it will be set as the reinforcing material 1 composed of the bag-shaped member 2 and the cylindrical member 3.

[0032] <<Reinforcing material insertion process>> This process is a process of inserting the reinforcing material 1 set in the above cylindrical member covering process, that is, the bag-shaped member 2 covered with the cylindrical member 3, into the cylindrical wall 12 of the hollow support column 11. It is inserted through the working long hole H provided in the cylindrical wall 12, and the fixing balloon 13 for temporary fixing is inflated and engaged with the cylindrical wall 12 for temporary fixing. The fixing balloon 13 will deflate as shown in FIGS. 5 and 6 after the adhesive hardens.

[0033] <<Filling material filling process>> This process is a process of filling the filling material f into the bag-shaped member 2 existing in the cylindrical wall 12 by the above reinforcing material insertion process. As described above, through the filling port provided in the bag-shaped member 2, filling agents such as cementitious materials, water, and air can be filled. As will be described later, according to the reinforcing method according to the present invention, the cylindrical wall 12 and the reinforcing material 1 (bag-shaped member 2 and cylindrical member 3) 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 does not harden like a cementitious material, that is, even if the hollow support column 11 is not made solid, appropriate reinforcement can be achieved.

[0034] <<Adhesive infiltration process>> This process is a process of squeezing out the adhesive impregnated in the outer peripheral surface portion 2a of the bag-shaped member 2 through the cylindrical member 3 while pressing the cylindrical member 3 against the inner peripheral surface 12a side of the cylindrical wall 12 by the bag-shaped member 2 swollen by the above filling material filling process. By this process, a sufficient amount of adhesive for reliable adhesion can be supplied.

[0035] <<Adhesive hardening process>> This step is to cure the adhesive that has oozed out in the above-mentioned adhesive infiltration step. By this step, as shown in FIGS. 5 and 6, the cylindrical member 3 can be embedded in the adhesive layer 7 formed between the outer peripheral surface 2a of the bag-shaped member 2 and the inner peripheral surface 12a of the cylindrical wall.

[0036] <Reinforcement structure> According to the reinforcement method of the present invention, as shown in FIGS. 5 and 6, the cylindrical wall 12 and the reinforcing material 1 (bag-shaped member 2 and cylindrical member 3) can be surely integrated. As a result, in particular, the cylindrical member 3 is integrated with the cylindrical wall 12 via the adhesive layer 7, and the warp threads 4 constituting the water-permeable sheet S2 of the cylindrical member 3 can appropriately reinforce the tensile strength of the cylindrical wall 12. Therefore, even if the filling material does not harden like a cement-based material, that is, even if water or air is used as the filling material f and the hollow column 11 is not made solid, appropriate reinforcement can be achieved.

Explanation of reference numerals

[0037] 1... Reinforcing material, 2... Bag-shaped member, 2a... Outer peripheral surface portion, 3... Cylindrical member, 4... Warp thread, 5... Weft thread, 6... Water passage gap, 7... Adhesive layer, 8... Warp thread of the conventional fiber sheet, 9... Weft thread of the conventional fiber sheet, S1... Water retention sheet, S1a... Upper end portion, S1b... Lower end portion, S2... Water-permeable sheet, S3... Sheet for forming bag, S3a... Upper end portion, S3b... Lower end portion, 11... Hollow column, 11a... Inner top surface, 11b... Inner bottom surface, 12... Cylindrical wall, 12a... Inner peripheral surface of cylindrical wall, 13... Fixing balloon, f... Filling material, GL... Ground, H... Working long hole.

Claims

1. A method for reinforcing the cylindrical wall of a hollow column from the inside, comprising: using a reinforcing material composed of a bag-shaped member having an outer peripheral surface with water-retaining properties that can be impregnated with a liquid adhesive before curing, and a cylindrical member covering the outer peripheral surface of the bag-shaped member and having water-permeability that allows the passage of the adhesive, and comprising the following steps A to F. A method for reinforcing a hollow column, characterized in that it comprises the following steps A to F. A: Impregnate the outer peripheral surface of the bag-shaped member in the reinforcing material with an adhesive. B: Cover the outer peripheral surface impregnated with the adhesive with the cylindrical member. C: Insert the bag-shaped member covered with the cylindrical member into the cylindrical wall of the hollow column. D: Fill the bag-shaped member existing in the cylindrical wall with a filler. E: Expand the bag-shaped member and press the cylindrical member against the inner peripheral surface of the cylindrical wall of the hollow column, and at the same time, allow the adhesive impregnated in the outer peripheral surface to ooze out through the cylindrical member. F: Embed the cylindrical member in the adhesive layer formed between the outer peripheral surface of the bag-shaped member and the inner peripheral surface of the cylindrical wall by curing the oozed adhesive.

2. The method for reinforcing a hollow column according to claim 1, characterized in that the cylindrical member is composed of a synthetic resin fiber sheet formed by connecting a plurality of warp threads made of synthetic resin fibers at intervals for water passage.

3. The method for reinforcing a hollow column according to claim 1, characterized in that the bag-shaped member is formed by molding a water-retaining sheet into a bag shape.

4. The method for reinforcing a hollow column according to claim 1, 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 with a water-retaining sheet.

5. The method for reinforcing a hollow column according to claim 3 or claim 4, characterized in that the water-retaining sheet is a non-woven fabric sheet.

6. The method for reinforcing a hollow column according to claim 4, characterized in that the non-water-permeable sheet is a nylon sheet.

7. The method for reinforcing a hollow column according to claim 4, characterized in that the non-breathable sheet is a rubber sheet.

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