JP4990087B2 - Hole reinforcing structure and hole reinforcing method for building - Google Patents

Description

  The present invention relates to a hole reinforcing structure and a hole reinforcing method for reinforcing the outer peripheral portion of a round hole formed in a building.

  In general, when building a new building such as a reinforced concrete structure, when opening a round hole for equipment piping in the beam, wall, floor, etc. of the building, in order to prevent a decrease in structural strength due to a cross-sectional defect, Concrete is placed after reinforcing reinforcing bars are arranged on the outer periphery of the hole.

  On the other hand, when a round hole is opened later in a structure such as a beam of a building, as shown in FIGS. 11 and 12, both side surfaces of the structure 2 along the outer periphery of the opened round hole 1. The steel plate 3 is fixed to the steel plate 3 with anchor bolts 4, and a non-shrink mortar or an adhesive is filled between the structure 2 and the steel plate 3 to reinforce the outer peripheral portion of the round hole 1.

  However, in the conventional hole reinforcement structure and hole reinforcement method described above, it is necessary to perform the work of arranging reinforcing reinforcing bars on the outer peripheral portion of the round hole or fixing the steel plate 3 with the anchor bolt 4 on site. For this reason, there is a problem that the field work becomes complicated, and it is difficult to reduce the construction cost and the construction period.

  In addition, when opening a round hole that is not described in the original design drawing in a conventional new construction work, it is considered that the hole may be regarded as having no structural opening in the Ministry of Land, Infrastructure, Transport and Tourism public building common specifications. In the case of a certain small opening (for example, an opening of 1/10 or less of the beam and 150 mm or less), it is often not necessary to reinforce, but even with such a small opening, the number If it increases or the interval becomes narrow, it may not be negligible in terms of strength.

Therefore, in recent years, in order to solve the various problems as described above, as shown in FIG. 13, a concrete structure in which a round hole 7 is opened in a plastic sheet 6 reinforced by a fiber mesh in which fibers 5 are arranged in a vertical and horizontal cross shape. A structure and a method for reinforcing the outer peripheral portion of the round hole 7 by being attached to the object 8 have been proposed (for example, see Patent Document 1).
JP 09-125601 A

  However, in the reinforcing structure and the reinforcing method described in Patent Document 1 described above, the outer periphery of the round hole 7 is reinforced by crossing the fibers 5 vertically and horizontally. There is a problem that the amount increases, it is difficult to arrange the fibers 5 efficiently, and it is difficult to reduce the cost.

  Further, as shown by a broken line in FIG. 13, the crack 9 generated in the outer peripheral portion of the round hole 7 of the concrete structure 8 is normally generated in the normal direction of the round hole 7, and therefore the arrangement direction of the fibers 5. The direction of occurrence of cracks 9 is not always orthogonal. Therefore, depending on the arrangement direction of the fibers 5 and the generation direction of the cracks 9, the plastic sheet 6 may not be able to sufficiently prevent the generation and growth of the cracks 9.

  The present invention has been made to solve the above-described problems, and can efficiently use fibers, reduce costs, and reliably prevent the generation and growth of cracks in the outer peripheral portion of a round hole. An object of the present invention is to provide a hole reinforcing structure and a hole reinforcing method for a building.

  In order to achieve the above-described object, the present invention is a hole reinforcing structure for reinforcing the outer peripheral portion of a round hole formed in a building, in which long fibers are wound along the outer peripheral portion of the round hole. It is constituted by a fiber body formed in an annular shape.

  The fiber body is preferably formed by impregnating a long fiber of carbon fiber with a resin.

  Further, one surface may be a rough surface.

  Further, the present invention is a hole reinforcing method for reinforcing the outer peripheral portion of a round hole formed in a building, wherein long fibers are wound along the outer peripheral portion of the round hole, and an annular fiber body And a step of affixing the fibrous body to an outer peripheral portion of a round hole of the building.

  The step of forming the fibrous body preferably includes a step of winding the carbon fiber long fibers in an annular shape and a step of impregnating the carbon fiber long fibers into a resin.

  According to the present invention, the long fiber is wound along the outer peripheral portion of the round hole, and the fiber is formed in an annular shape. Therefore, the fiber is used efficiently, and the cost is reduced. Generation and growth of cracks in the outer periphery of the round hole can be reliably prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, FIG. 1 is a plan view showing a hole reinforcing structure for a building according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the hole reinforcing structure for the building, and FIG. 3 is a hole reinforcing structure for the building. FIG. 4 is a side view showing an example of a spinning wheel used when manufacturing a hole reinforcing structure of the same building, and FIG. 5 is a side view showing the hole reinforcing structure of the same building. FIG. 6 is a cross-sectional view showing a state in which the hole reinforcing structure of the same building is attached to the beam, and FIG. 7 is a view of the hole reinforcing structure of the same building. It is explanatory drawing for demonstrating an effect. In addition, in the following description, it illustrates about the case where the hole reinforcement structure and the hole reinforcement method of the building which concern on embodiment of this invention are applied to reinforcement of the outer peripheral part of the round hole opened to the beam of the building of a reinforced concrete structure To explain.

  In the hole reinforcement structure for a building according to the present embodiment, carbon fiber long fibers 13 are wound along the outer periphery of the round hole 12 opened in the beam 11 of the building, and the long fiber 13 is resin 26. It is comprised by the fiber body 14 impregnated with and shape | molded in the annular | circular shape. Then, the fibrous body 14 is wound so that the long fibers 13 are spirally wound or polymerized by taking a required overlap length, or the amount of impregnation of the resin 26 between the long fibers 13 is adjusted. Thus, a sheet or plate having a desired thickness is formed.

  FIG. 3 shows an example of a manufacturing apparatus 15 used when manufacturing a hole reinforcing structure having such a configuration. The manufacturing apparatus 15 is rotatably supported and wound with carbon fiber long fibers 13. The original yarn wheel 16, the resin container 17 disposed downstream of the original yarn wheel 16, and containing the resin 26, the rollers 18a, 18b, 18c respectively disposed inside, upstream and downstream of the resin container 17, and downstream And a spinning wheel 19 disposed further downstream of the side roller 18c.

  As shown in FIG. 4, the spinning wheel 19 includes a mandrel 21 having bolt portions 20 a and 20 b formed on both sides, and an annular plate-like spacer that penetrates the mandrel 21 and is arranged at the center of the mandrel 21. 22, two annular plate-like plates 23 a, 23 b that are provided through the mandrel 21 and are arranged in parallel on both sides of the spacer 22, and are screwed into the bolt portions 20 a, 20 b of the mandrel 21. It is comprised by nut 24a, 24b which presses 23b to the spacer 22 side.

  When manufacturing a hole reinforcement structure using such a manufacturing apparatus 15, the spinning wheel 19 is rotated in a predetermined direction (clockwise direction in FIG. 3). Then, the front and rear rollers 18 b and 18 c of the original spinning wheel 16 and the resin container 17 rotate in the same direction as the spinning wheel 19, and the roller 18 a inside the resin container 17 rotates in the opposite direction to the spinning wheel 19. As a result, the carbon fiber long fibers 13 wound around the original spinning wheel 16 are impregnated with the resin 26 inside the resin container 17 and then wound around the spacer 22 between the plates 23 a and 23 b of the spinning wheel 19. Is done. At this time, the thickness of the fiber body 14 and the size of the center hole 19 of the fiber body 14 can be freely changed by changing the thickness and outer diameter of the spacer 22.

  Next, after the fiber body 14 thus molded is hardened, the nuts 24a and 24b and the plates 23a and 23b are removed from the mandrel 21 of the spinning wheel 19, and the hardened annular fiber body 13 is further removed. 14 is carried to the site.

  At the site, as shown in the left diagram of FIG. 5, first, a circular hole 12 having a desired size is opened in the beam 11 using a core drill or the like. At this time, check the position of the reinforcing bar in advance using an electromagnetic reinforcing bar sensor, etc., and be careful not to cut the reinforcing bar.

  Next, the outer peripheral surface of the round hole 12 on both sides of the beam 11 to be reinforced is subjected to a ground treatment and cleaned. At this time, if there are cracks or missing portions on the outer periphery of the round hole 12, the ground treatment is performed after repairing. Then, an epoxy resin primer is applied to the outer peripheral surface of the round hole 12 on both sides of the beam 11 and infiltrated into the concrete. Then, the same type of epoxy adhesive as the primer is applied, and the fiber body 14 is applied. Affix (see the diagram on the right side of FIG. 5 and FIG. 6). Then, a finishing process is given to the fiber body 14 as needed.

  As described above, according to the embodiment of the present invention, the long fiber 13 is wound along the outer peripheral portion of the round hole 12, and the fiber body 14 is formed in an annular shape, which is indicated by a broken line in FIG. Thus, since the long fiber 13 is orthogonal to the direction (normal direction) of the crack 25 generated in the outer peripheral portion of the round hole 12, the generation of the crack 25 can be prevented. Moreover, even if the crack 25 is generated in the outer peripheral portion of the round hole 12, the growth of the crack 25 can be surely suppressed, and the strength and toughness of the structure such as the beam 11 can be prevented from being lowered.

  Furthermore, since the fibrous body 14 having a desired thickness and size can be manufactured simply by winding the long fiber 13 and impregnating the resin 26, the manufacturing operation can be performed outside the site, thereby simplifying the manufacturing. In addition, the manufacturing cost can be reduced and the construction period can be shortened. Moreover, since it is not necessary to cross | intersect the long fiber 13, the quantity of the long fiber 13 to be used can be reduced, the long fiber 13 can be arrange | positioned efficiently, and reduction of the further cost can be aimed at. .

  In addition, as shown in FIG. 8, the spinning wheel used for the manufacturing apparatus 15 may be formed so that the inner surface of one plate 23b forms a rough surface. In this case, one surface of the fibrous body 14 is a rough surface. Thus, by sticking this rough surface to the outer peripheral surface of the round hole 12 of the beam 11, the adhesion strength of the fiber body 14 to the beam 11 can be increased.

  Further, as shown in FIG. 9, the fiber body 14 is formed in an annular shape by overlapping and laminating a sheet 27 provided with a slit-like cut portion 26 in the normal direction, or as shown in FIG. 10. The half-divided sheet 28 can be overlapped and formed into an annular shape. Thereby, reinforcement work can be easily applied to the round hole 12 that has already been piped.

  The manufacturing method of the hole reinforcing structure is not limited to the above-described example. The resin 26 is impregnated with the carbon fiber long fibers 13 wound around the spinning wheel 19 or the plate 23a of the spinning wheel 19 is impregnated. , 23b, and after the resin 26 is filled, the carbon fiber long fibers 13 are wound around the spinning wheel 19 before the resin 26 is cured, or the spinning wheel 19 itself is submerged in the resin 26 in the resin container 17. Various changes can be made, such as winding the carbon fiber long fiber 13 in a state of being damaged.

  Furthermore, the material of the long fibers 13 constituting the fiber body 14 is not limited to the above-described carbon fibers, and materials other than carbon fibers such as aramid fibers, glass fibers, or vinylon fibers can be used. Furthermore, as the resin 26 impregnated in the long fibers 13, various resins can be used as long as they are compatible with carbon fibers, such as epoxy resin and methacrylic resin.

  Furthermore, in the above-described embodiment, the case where the present invention is applied to the reinforcement of the outer peripheral portion of the round hole 12 opened in the beam 11 of the reinforced concrete building is described. The invention can be applied not only to the walls, floors, and columns of buildings made of reinforced concrete but also to beams, walls, floors, columns, etc. of buildings other than reinforced concrete, such as steel frames and wooden structures.

  Further, the present invention can be applied to the round hole 12 that does not penetrate other than the round hole 12 that penetrates the beam 11 described above, and the “round hole” of the present invention includes these round notches that do not penetrate. Shall be included.

It is a top view which shows the hole reinforcement structure of the building which concerns on embodiment of this invention. It is sectional drawing which shows the hole reinforcement structure of the building which concerns on embodiment of this invention. It is a conceptual diagram which shows an example of the manufacturing apparatus used when manufacturing the hole reinforcement structure of the building which concerns on embodiment of this invention. It is a side view which shows an example of the spinning wheel used when manufacturing the hole reinforcement structure of the building which concerns on embodiment of this invention. It is a front view which shows the state before sticking the hole reinforcement structure of the building which concerns on embodiment of this invention to a beam, and the state after sticking. It is sectional drawing which shows the state which stuck the hole reinforcement structure of the building which concerns on embodiment of this invention to the beam. It is explanatory drawing for demonstrating the effect by the hole reinforcement structure of the building which concerns on embodiment of this invention. It is a side view which shows another example of the spinning wheel used when manufacturing the hole reinforcement structure of the building which concerns on embodiment of this invention. It is a top view which shows the modification of the hole reinforcement structure of the building which concerns on embodiment of this invention. It is a top view which shows another modification of the hole reinforcement structure of the building which concerns on embodiment of this invention. It is a front view which shows a prior art example. It is sectional drawing which shows a prior art example. It is a front view which shows another prior art example.

Explanation of symbols

11 Beam (Building)
12 round hole 13 long fiber 14 fiber body 26 resin

Claims (2)

A hole reinforcing structure for reinforcing the outer periphery of a round hole formed in a building,
A long fiber is wound along the outer peripheral portion of the round hole, and a long fiber is impregnated with a resin so that a slit-shaped cut portion is provided in the normal direction of the annularly shaped fiber body. hole reinforcement structure of a building, characterized that you have an annular shape by bonding. A hole reinforcing structure for reinforcing the outer periphery of a round hole formed in a building,
A long fiber is wound along the outer peripheral portion of the round hole, and the long fiber is impregnated with a resin, and a fiber body formed in a ring shape is halved to form an annular shape. A hole reinforcement structure for a building , characterized by being formed .

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