Methods for reinforcing hollow support columns

Abstract

To provide a reinforcing material that can be reliably bonded to the inner surface of the cylindrical wall of a hollow support column, and a reinforcement method using the reinforcing material. [Solution] The reinforcing material 1 for a hollow support column according to the present invention is a reinforcing material that reinforces the cylindrical wall 12 of a hollow support column 11 from the inside, and consists of a bag-shaped member 2 whose outer surface has water retention properties and a cylindrical member 3 which has water permeability and covers the outer surface 2a of the bag-shaped member, and by impregnating the outer surface 2a of the bag-shaped member 2 with liquid adhesive before hardening and allowing the impregnated adhesive to seep out through the cylindrical member 3, the amount of adhesive necessary for strong adhesion can be reliably supplied.

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, such as a concrete hollow column used as a utility pole or a signal pole, a steel hollow column used as a guardrail pole, a pile bridge pier, or a pier column, from the inside.

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. Therefore, 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 especially 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 conventional bag-shaped reinforcing material described above is constructed by sewing together sheet materials formed by weaving synthetic resin fibers to prevent leakage of the filler material such as cement mortar and to achieve the desired strength (Patent Document 1: paragraph

[0021] , etc.). However, since the woven sheet material does not retain water, it is difficult to apply the appropriate amount of adhesive necessary for reliable bonding, and even if bonded, there is a risk that the bag-shaped reinforcing material may slip down due to the weight of the filler material, etc. [Means for solving the problem]

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

[0007] In summary, the reinforcing material for a hollow support column according to the present invention is a reinforcing material that reinforces the cylindrical wall of a hollow support column from the inside, and consists of a bag-shaped member whose outer surface has water retention properties and a cylindrical member that has water permeability and covers the outer surface of the bag-shaped member, and by impregnating the outer surface of the bag-shaped member with liquid adhesive before hardening and allowing the impregnated adhesive to seep out through the cylindrical member, the amount of adhesive necessary for strong adhesion can be reliably supplied.

[0008] Preferably, the cylindrical member is made of a synthetic resin fiber sheet formed by connecting multiple warp threads made of synthetic resin fibers with gaps for water passage, which allows the adhesive to be reliably guided to the inner surface of the cylindrical wall of the hollow support column, and in particular, the warp threads can appropriately respond to the tensile stress applied to the hollow support column.

[0009] Furthermore, the bag-shaped member is formed by molding a water-retentive 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 its outer surface with a water-retentive sheet. In either case, water retention is provided to the outer surface of the bag-shaped member, allowing a sufficient amount of adhesive to be impregnated into it.

[0010] Preferably, a nonwoven fabric sheet is used as the water-retentive sheet. Preferably, a nylon sheet is used as the non-water-permeable sheet. Preferably, a rubber sheet is used as the non-permeable sheet.

[0011] Furthermore, the method for reinforcing a hollow support column according to the present invention is a method of reinforcing by arranging the above-mentioned reinforcing material inside the cylindrical wall of the hollow support column, and by comprising the following steps A to F, reliable reinforcement can be achieved.

[0012] A: The outer surface of the bag-shaped member in the reinforcing material is impregnated with adhesive. B: The outer surface portion impregnated with the adhesive is covered with the cylindrical member. C: Insert the bag-shaped member covered with the cylindrical member into the cylindrical wall of the hollow support column. D: Fill the bag-shaped member located inside the cylindrical wall with a filler material. E: Inflate the bag-shaped member and press the cylindrical member against the inner surface of the cylindrical wall of the hollow support column, while allowing the adhesive impregnated on the outer surface to seep out through the cylindrical member. F: The cylindrical member is embedded in the adhesive layer formed between the outer surface of the bag-shaped member and the inner surface of the cylindrical wall by the hardening of the seeped-out adhesive. [Effects of the Invention]

[0013] According to the reinforcing material and reinforcing method for hollow support columns of the present invention, the reinforcing material can be reliably integrated with the hollow support column, thereby ensuring reliable reinforcement. [Brief explanation of the drawing]

[0014] [Figure 1] This is an explanatory diagram of a bag-shaped member that constitutes a reinforcing material according to the present invention. [Figure 2] This is an explanatory diagram of the reinforcing material according to the present invention. [Figure 3] This is an enlarged explanatory diagram of a cylindrical member constituting the reinforcing material according to the present invention. [Figure 4] This is an explanatory diagram showing another example of the reinforcing material according to the present invention. [Figure 5]It is a cross-sectional view explaining the reinforcing structure constructed using the reinforcing material shown in FIG. 3. [Figure 6] It is a cross-sectional view explaining the reinforcing structure constructed using the reinforcing material shown in FIG. 4. [Figure 7] It is a cross-sectional view showing the warp of the fiber sheet. (A) is a cross-sectional view showing the warp of the fiber sheet used for the cylindrical member according to the present invention, and (B) is a cross-sectional view showing the warp of the fiber sheet used for the conventional bag-shaped member.

Best Mode for Carrying Out the Invention

[0015] The optimal embodiments of the reinforcing material and the reinforcing method for the hollow column according to the present invention will be described based on 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 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 allowed to ooze out, and the cylindrical member 3 and the bag-shaped member 2 and the cylindrical wall 12 are integrated to achieve reinforcement.

[0017] The 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, but may be an elliptical cylindrical shape, a polygonal cylindrical shape, or the like. In addition, 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 span from above the ground GL to below the ground GL for 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 a filler inside, it has an outer peripheral surface portion 2a that bulges to a size that closely adheres to the inner peripheral surface 12a of the cylindrical wall 12 of the hollow column 11 to be reinforced. Also, the length of the bag-shaped member 2 in the vertical direction (lengthwise), that is, for example, the length from the upper end portion S1a to the lower end portion S1b of the water retention sheet S1 described later can be appropriately adjusted according to the reinforcement location. Although not specifically shown, a filling port for filling the filler at a desired location can be provided.

[0019] In the present invention, 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, and at the same time as pressing the cylindrical member 3 described later against the cylindrical wall 12 of the hollow column 11, a necessary amount of adhesive can be reliably supplied.

[0020] In order to impart water retention to the outer peripheral surface portion 2a, as shown in Fig. 1, the water retention sheet S1 can be formed into a bag shape to form the bag-shaped member 2 itself with the water retention sheet S! That is, the water retention sheet S1 is formed into a cylindrical shape similar to the internal space of the reinforcement location 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, and the upper end portion S3a and the lower end portion S3b are closed to form a bag shape, and at the same time, the outer peripheral surface portion thereof is covered with the water retention sheet S1 to form a double structure, thereby imparting water retention to the outer peripheral surface portion 2a.

[0022] As the water-retaining sheet S1, in addition to nonwoven fabric sheets, sheets with a porous structure such as paper sheets, wooden sheets, cloth sheets, and foam sheets can be used to impregnate as much liquid adhesive as possible before hardening, and the impregnated adhesive can be appropriately released when compressed. Preferably, if a nonwoven fabric sheet is used, not only will it retain water, but even when the bag-shaped member 2 is constructed using only the water-retaining sheet S1, it can also appropriately hold cement-based materials such as cement mortar and concrete when the filler is used.

[0023] Furthermore, when using a non-water-permeable sheet as the bag-forming sheet S3, there are no particular limitations as long as it can prevent the passage of liquid, but nylon sheets, polyvinyl chloride sheets, polyethylene sheets, polypropylene sheets, and acrylic urethane sheets are preferred because they are easy to mold and durable. When constructing a bag-shaped member 2 using a non-water-permeable sheet S3 for bag formation, a simple liquid such as water that does not harden like cement-based materials can be used as a filler.

[0024] Furthermore, when using a non-permeable sheet as the bag-forming sheet S3, there are no particular limitations as long as it can prevent the passage of gas, especially air, but rubber sheets, polyvinyl chloride sheets, polyethylene sheets, polypropylene sheets, and acrylic urethane sheets are preferred because they are easy to mold and durable. When constructing a bag-shaped member 2 using a non-permeable sheet, such as the bag-forming sheet S3, a simple gas such as air that does not harden like cement-based materials can be used as a filler.

[0025] Furthermore, known liquid adhesives such as epoxy adhesives and acrylic urethane adhesives can be used as the adhesive. Preferably, if an epoxy adhesive is used, the adhesive strength will not be hindered even if, for example, moisture from the cement-based material leaks out from the bag-shaped member 2. In addition, it can be appropriately adjusted depending on the material of the hollow support column to be reinforced.

[0026] ≪Cylindrical member 3≫ In this invention, the cylindrical member 3 is characterized by having water permeability in order to allow the adhesive impregnated into the outer surface portion 2a of the bag-shaped member 2 described above to reach the cylindrical wall 12 of the hollow support column 11. For this reason, it is formed by molding a water-permeable sheet S2 into a cylindrical shape.

[0027] The water-permeable sheet S2 must 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. Preferably, the water-permeable sheet S2 is 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, with appropriate gaps for water permeability.

[0028] As the water-permeable sheet S2, it is particularly desirable to use a synthetic resin fiber sheet made by joining multiple warp threads 4 made of synthetic resin fibers with weft threads 5 while leaving water-permeable intervals 6, as shown in Figure 3. In other words, it is desirable to use a "bamboo screen-like sheet" which mainly consists of warp threads 4 that extend vertically during use and has appropriate gaps 6. As shown in Figure 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, making it easier to exhibit tensile strength. In contrast, as shown in Figure 7(B), in the conventional synthetic resin sheet formed by weaving synthetic resin fibers, the warp threads 8 meander due to weaving with the weft threads 9, and effective tensile strength could not be expected. It is desirable to use fiber bundles of many synthetic resin fibers for the warp threads 4 in order to ensure strength.

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

[0030] ≪Adhesive Impregnation Process≫ In this process, first, the outer surface 2a of the bag-shaped member 2 is impregnated with adhesive. This can be done by applying the adhesive to the outer surface 2a using known application methods such as brush application, roller application, or spray application. In particular, applying with a roller called a de-aerating roller, which can remove air bubbles from the application material, allows for effective impregnation of the outer surface 2a of the bag-shaped member 2 with adhesive. The amount of adhesive applied can be adjusted as appropriate, taking into account the weight of the reinforcing material 1 and the filler material f, as well as the material of the cylindrical wall 12.

[0031] <<Cylindrical Member Coating Process>> This step involves covering the outer surface 2a of the adhesive-impregnated bag-shaped member 2 with the cylindrical member 3, as shown in Figures 2 and 4, following the adhesive impregnation step described above. In this step, the bag-shaped member 2 and the cylindrical member 3 are set together as a reinforcing material 1.

[0032] ≪Reinforcement material insertion process≫ This step involves inserting the reinforcing material 1, i.e., the bag-shaped member 2 covered with the cylindrical member 3, which was set in the cylindrical member covering step described above, into the cylindrical wall 12 of the hollow support column 11. The bag-shaped member 2 is inserted through the elongated work 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 to temporarily fix it in place. After the adhesive hardens, the fixing balloon 13 is deflated as shown in Figures 5 and 6.

[0033] ≪Filler filling process≫ This step involves filling the bag-shaped member 2, which is located inside the cylindrical wall 12 as a result of the reinforcing material insertion step described above, with a filler material f. As previously described, fillers such as cement-based materials, water, and air can be filled through the filling opening provided in the bag-shaped member 2. As will be described later, according to the reinforcing method of 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 filler material does not harden like a cement-based material, that is, even if the hollow support column 11 does not become solid, appropriate reinforcement can be achieved.

[0034] ≪Adhesive Infiltration Process≫ This process involves pressing the cylindrical member 3 against the inner circumferential surface 12a of the cylindrical wall 12 using the bag-shaped member 2 that has expanded as a result of the filler filling process, while simultaneously allowing the adhesive impregnated into the outer circumferential surface 2a of the bag-shaped member 2 to seep out through the cylindrical member 3. This process ensures that a sufficient amount of adhesive is supplied for reliable bonding.

[0035] ≪Adhesive curing process≫ This step involves curing the adhesive that has seeped out during the adhesive impregnation step described above. Through this step, as shown in Figures 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 Figures 5 and 6, the cylindrical wall 12 and the reinforcing material 1 (bag-shaped member 2 and cylindrical member 3) can be reliably integrated. As a result, 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 filler does not harden like a cement-based material, that is, even if the hollow support column 11 is not made solid by using water or air as the filler f, appropriate reinforcement can be achieved. [Explanation of Symbols]

[0037] 1…Reinforcement material, 2...bag-shaped member, 2a...outer peripheral surface part, 3…Cylindrical member, 4... Warp threads, 5...Weft thread, 6...Water flow gap, 7...adhesive layer, 8...The warp threads of conventional fiber sheets, 9...The weft yarn of conventional fiber sheets, S1...Water-retaining sheet, S1a...Upper end, S1b...Lower end, S2...Water permeable sheet, S3...bag forming sheet, S3a...upper end, S3b...lower end, 11...Hollow support column, 11a...Inner top surface, 11b...Inner bottom surface, 12...Cylinder wall, 12a...Cylinder wall inner peripheral surface, 13…Fixation balloon, f...Filling material, GL...ground, H...Elongated hole for work.

Claims

1. A reinforcing material for a hollow support column, which reinforces the cylindrical wall of the hollow support column from the inside, characterized in that it consists of a bag-shaped member whose outer surface has water retention properties and a cylindrical member that has water permeability and covers the outer surface of the bag-shaped member.

2. The reinforcing material for a hollow support column according to claim 1, 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 spacings for water passage.

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

4. The reinforcing material for a hollow support column according to claim 1, characterized in that the bag-shaped member is formed by shaping a non-water-permeable sheet or a non-air-permeable sheet into a bag shape and covering its outer surface with a water-retaining sheet.

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

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

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

8. A reinforcing method for reinforcing the cylindrical wall of a hollow support column from the inside using the reinforcing material described in claims 1 to 7, characterized by comprising the following steps A to F. A: The outer surface of the bag-shaped member in the reinforcing material is impregnated with adhesive. B: The outer surface portion impregnated with the adhesive is covered with the cylindrical member. C: Insert the bag-shaped member covered with the cylindrical member into the cylindrical wall of the hollow support column. D: Fill the bag-shaped member located inside the cylindrical wall with a filler material. E: Inflate the bag-shaped member and press the cylindrical member against the inner surface of the cylindrical wall of the hollow support column, while allowing the adhesive impregnated on the outer surface to seep out through the cylindrical member. F: The cylindrical member is embedded in the adhesive layer formed between the outer surface of the bag-shaped member and the inner surface of the cylindrical wall by the hardening of the adhesive that has seeped out.

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