JP2009270254A - Reinforcing method for concrete member, and concrete member reinforced by the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing method for a concrete member, which can maintain an excellent reinforcing effect by making a stuck reinforcing material hardly stripped off from a surface of the concrete member, in particular, preventing the separation of the end of the reinforcing material; and to provide the concrete member reinforced by the method. <P>SOLUTION: This reinforcing method for the concrete member is characterized as follows: the reinforcing material containing continuous fibers is stuck on the concrete member constituting at least a part of the concrete structure, more specifically, a surface except a surface of the concrete member, serving as a surface colliding with an object from the outside; and particularly, the reinforcing material is fixed to the concrete member by means of an anchoring material. The concrete member is reinforced by the above method. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for reinforcing a concrete member in a concrete structure such as a rock shed or a snow shed that collides with an external object such as a falling rock, and a concrete member reinforced by the reinforcing method.

  Conventionally, in reinforced concrete members such as rock sheds and snow sheds where objects such as falling rocks repeatedly collide, in order to prevent destruction of the concrete members, a cushioning material such as sand has been installed on the surface where the concrete member objects collide. It was. However, existing concrete members can be destroyed by the impact of falling rocks exceeding the assumed mass and the accumulation of impact fatigue due to repeated rock falling. In the past, rebuilding was often done using the scrap and build method, but in recent years, due to the situation where social capital investment is being reduced, the policy has been changed to extend the life of existing structures.

  In order to extend the life of an existing concrete structure that receives an impact of an object from the outside, generally, a method of reducing the impact and impact fatigue received by the existing concrete structure or a method of reinforcing the existing concrete structure is employed.

  When the shock mitigation method is adopted, a method of installing an additional buffer band made of sand or the like from the buffer band made of sand or the like on the surface of the concrete member that the object collides with, or after removing the buffer band once There is a method of installing a buffer band as described in Patent Document 1, that is, a method of protecting a concrete structure by installing a buffer material on a collision surface. However, when these methods are adopted, heavy construction is required for the construction, and thus a long construction period is required. In addition, there is a risk of traffic congestion due to the need for extensive traffic regulations during construction. Furthermore, since construction is usually performed in a mountainous area, it is often difficult to carry in materials and heavy machinery.

Moreover, in the case of the method of reinforcing an existing concrete structure, as described in Patent Document 2, there is a reinforcing method in which a high strength fiber sheet is attached. However, since this reinforcing method is a method in which a high-strength fiber sheet is simply attached to an existing concrete member, the reinforcing effect depends on the adhesive force of the adhesive interposed between the sheet and the existing concrete member. Therefore, if the sheet peels from the existing concrete member, the concrete member may suddenly lose its reinforcing effect and may be destroyed.
Japanese Patent Laid-Open No. 10-121420 JP 2006-257669 A

  As described above, even if the method described in Patent Document 2 is adopted, for example, when the attached sheet is peeled from the end portion, the reinforcing strength is lowered. Moreover, even if the concrete member is covered with a U-shaped sheet or the sheets are wound several times, once the end of the sheet is peeled off, the reinforcing effect in the reinforcing fiber direction is lost or extremely reduced. Probability is high.

  Accordingly, the object of the present invention is to focus on the above-mentioned problems, and basically to make it possible to maintain the reinforcing effect by making the attached reinforcing material difficult to peel off from the surface of the concrete member. Providing a concrete member reinforced by simple material loading and construction, and a concrete member reinforced by the method, which can stably maintain an excellent reinforcing effect by preventing the peeling of the end of the steel It is in.

  In order to solve the above problems, a method for reinforcing a concrete member according to the present invention is a surface other than the surface of a concrete member that is a surface on which an object from the outside collides with a concrete member constituting at least a part of a concrete structure. And a reinforcing material containing continuous fibers.

  Since the reinforcing material is affixed to the surface of the concrete member other than the surface on which the object from the outside collides, the object from the outside such as rock fall does not directly collide with the reinforcing material. The adhesiveness between the reinforcing material and the concrete member surface is maintained well, the reinforcing effect by the reinforcing material is maintained well, and the fracture strength of the concrete member is maintained high. For example, when the reinforcing material bears the tensile force that is suddenly applied to the concrete member, the impact resistance and impact resistance repeatability of the concrete member are improved.

  In particular, by attaching the reinforcing material to the surface opposite to the surface of the concrete member where the object from the outside collides, the performance of the reinforcing material and the adhesion between the reinforcing material and the concrete member surface are more reliably and better. Can be maintained.

  The reinforcing material in the present invention is not particularly limited as long as it is a reinforcing material containing continuous fibers of reinforcing fibers, but is preferably made of fiber reinforced plastic from the viewpoint of excellent reinforcing effect and adhesiveness to the concrete member surface. However, it can also be used in the form of reinforcing fibers, for example, in the form of bundles or sheet-like reinforcing fibers.

  In the present invention, it is particularly preferable to fix the reinforcing material to the concrete member with a fixing material. By fixing the reinforcing material with the fixing material, the fixing degree (fixing strength) is increased and the attached reinforcing material is not easily peeled off, as compared with the case where the reinforcing material is simply pasted with an adhesive. In particular, by disposing the fixing material at the end of the reinforcing material, it becomes possible to appropriately prevent the end of the reinforcing material from being peeled off, and to prevent the above-described reduction in the reinforcing effect accompanying the peeling of the end.

  The method for joining or connecting the fixing material and the reinforcing material is not particularly limited. For example, at least a part of the fixing material may be attached to a predetermined portion (for example, an end portion) of the reinforcing material. It is also possible to wrap a part of the fixing material around the reinforcing material.

  The method of joining or connecting the fixing material and the concrete member is not particularly limited. However, as described above, the fixing material can increase the fixing strength of the reinforcing material to the concrete member or prevent the end of the reinforcing material from peeling off. Therefore, it is preferable that the fixing material is fixed to the concrete member as strongly as possible. For example, it is preferable to insert at least a part of the fixing material into a hole formed in the concrete member, thereby firmly fixing the fixing material to the concrete member.

  The material and form of the fixing material are not particularly limited, but the reinforcing material is made of continuous fiber, particularly fiber reinforced plastic, and it is considered to increase the fixing strength of the reinforcing material by joining or connecting to the reinforcing material. In particular, it is preferably made of reinforcing fibers. The reinforcing fiber constituting the fixing material can be formed in at least one of a strand, a net fabric, a braid, and a twisted cord, for example.

  The present invention also provides a concrete member reinforced by such a method for reinforcing a concrete member.

According to the present invention, the following effects can be obtained.
(1) By placing the reinforcing material on the surface of the concrete member other than the object collision surface, continuous fibers can be applied to the tensile force applied suddenly in the concrete member without breaking even when subjected to repeated impacts by objects such as falling rocks. By bearing with the reinforcing material included, the impact resistance and impact resistance repeatability of the concrete member can be improved.
(2) Since it is the construction which affixes a reinforcing material on the surface of a predetermined concrete member, it can be easily constructed without requiring heavy machinery and large traffic restrictions, and the construction can be completed in a short construction period. In addition, since the material is light and compact, it is easy to carry in the material.
(3) The reinforcing effect can be maintained by preventing peeling of the end portion of the reinforcing material using the fixing material.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a concrete member reinforced by a concrete member reinforcing method according to an embodiment of the present invention. In this embodiment, the reinforcing member 5 made of fiber reinforced plastic is attached to the concrete member surface 4 on the side opposite to the concrete member surface 3 on which the object 2 from the outside such as falling rocks repeatedly collides. . The reinforcing material 5 made of fiber reinforced plastic is bonded to the concrete member 1 by, for example, impregnating the reinforced fiber with the matrix resin using the reinforced fiber and the matrix resin at the site, and is bonded to the concrete member 1 as a fiber reinforced plastic. Or what was made into the fiber reinforced plastic beforehand in a factory can also be affixed with the adhesive similar to a matrix resin.

  In the present embodiment, the reinforcing material 5 is bonded to the concrete member 1 and is fixed to the concrete member 1 with the fixing material 6. The fixing material 6 is composed of reinforcing fibers, and the form of the reinforcing fibers constituting the fixing material 6 is composed of at least one of a strand, a net fabric, a braid, and a twisted cord. Further, in this embodiment, the fixing material 6 is joined to both ends of the reinforcing material 5, and a part of the fixing material 6 is inserted into the hole 7 formed in the concrete member 1 to be strong against the concrete member 1. It is fixed.

  The end portion of the fixing member 6 on the side of the reinforcing material 5 is preferably widened in a divergent shape as shown in FIGS. 2 and 3 so as to be firmly joined to the reinforcing material 5. Although a part of the fixing material 6 is inserted into the hole 7 formed in the concrete member 1, in the case of the concrete member 1 that can be penetrated, the fixing material 6 is fixed to the through holes 7a and 7b as shown in FIGS. It is preferable that both ends of the fixing material are joined to the reinforcing materials 5a and 5b through the materials 6a and 6b. In the case of a concrete member that cannot penetrate, for example, as shown in FIG. 4, one end side of the fixing member 6c may be embedded in the concrete member 1 and the other end side may be joined to the reinforcing member 5c.

  The fixing material is preferably bonded not only at both ends of the reinforcing material but also at two or more locations. For example, as shown in FIGS. 5 and 6, the fixing material 6d having the same configuration can be arranged at two or more locations with respect to the reinforcing material 5d.

  As for the joining of the reinforcing material and the fixing material, in addition to the method of joining with an adhesive similar to the matrix resin, as shown in FIG. 7, a method of winding the fixing material 6e around the reinforcing material 5e, or as shown in FIG. In addition, when the joint portion of the fixing material 6f is formed on a net fabric, braid, or the like, a method of covering the reinforcing material 5f itself with the fixing material 6f can be employed.

  In the case of the fixing material penetrating through the hole, the central portion is a bundle of reinforcing fibers, but in order to achieve a stronger joint with the reinforcing material, for example, as shown in FIG. It is preferable that the material end 8) is fan-shaped or circularly spread so that the entire shape is a fixing material 6g formed in a dumbbell shape or a bow tie shape. In the case of a fixing material that cannot penetrate, for example, as shown in FIG. 10, a fixing material 6h having a fixing material end 8 that is a bundle of reinforcing fibers and the other is fan-shaped or circular can be used.

  Here, the shape of the fixing material end is preferably an expanded planar shape. For example, a fan-shaped fixing material end 8a as shown in FIG. 11, a polygonal fixing material end 8b as shown in FIG. A circular fixing material end 8c as shown in FIG. 13 can be adopted, and besides these, for example, a hook-shaped fixing material end 8d as shown in FIG. 14 and a fan-shaped fixing material end 8e as shown in FIG. 15 are provided. Can be adopted. Among these, it is preferable to set it as the fan shape which can be expanded, keeping a fiber linear. However, in the case of a method of wrapping around a reinforcing material, both ends of the fixing material may be a bundle of reinforcing fibers.

  Examples of the reinforcing fibers constituting the reinforcing material and the fixing material include metal fibers, polyester fibers, carbon fibers, aramid fibers, glass fibers, polyparaphenylene benzoxazole (PBO) fibers, and polyethylene fibers having a molecular weight of 1 million or more. Although it is preferable that it consists of at least 1 type of continuous fiber chosen from the group which consists of, it is more preferable to set it as high strength carbon fiber especially.

  The matrix resin used for the configuration of the reinforcing material made of fiber reinforced plastic is at least one matrix resin selected from the group consisting of unsaturated polyester resins, epoxy resins, phenol resins, vinyl ester resins, and methacrylic (MMA) resins. Although it is preferable, it is more preferable to set it as the epoxy resin excellent in durability and usability.

  When the fixing material is attached to the reinforcing material, or when the concrete member and the fixing material are bonded and fixed, it is preferable to use a matrix resin constituting the reinforcing material.

  The reinforcing method according to the present invention is mainly used to reinforce concrete structures in mountainous areas such as rock sheds, but its application range is not limited to reinforcing concrete structures such as rock sheds, ships and quay walls that receive waves It can also be applied to other concrete structures.

It is a side view of the concrete member reinforced with the concrete member reinforcement method concerning one embodiment of the present invention. It is a perspective view of the concrete member concerning another embodiment. It is a perspective view of the concrete member concerning another embodiment. It is a perspective view of the concrete member concerning another embodiment. It is a side view of the concrete member concerning another embodiment. It is a perspective view of the concrete member concerning another embodiment. It is a perspective view of the concrete member concerning another embodiment. It is a perspective view of the concrete member concerning another embodiment. It is a top view which shows an example of a fixing material. It is a top view which shows another example of a fixing material. FIG. 6 is a plan view illustrating an example of a fixing material end. FIG. 10 is a plan view showing another example of the fixing material end. FIG. 10 is a plan view showing still another example of the fixing material end. FIG. 10 is a plan view showing still another example of the fixing material end. FIG. 10 is a plan view showing still another example of the fixing material end.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete member 2 Object from the outside 3 Concrete member surface where an object collides 4 Concrete member surface on the opposite side to an object collision surface 5 Reinforcement material 5a, 5b, 5c, 5d, 5e, 5f made of fiber reinforced plastic 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h Fixing material 7, 7a, 7b Hole 8, 8a, 8b, 8c, 8d, 8e Fixing material end

Claims (10)

  A concrete member characterized by sticking a reinforcing material containing continuous fibers to a surface other than a concrete member surface on which a concrete object constituting at least a part of a concrete structure collides with an external object. Reinforcement method.   The method for reinforcing a concrete member according to claim 1, wherein the reinforcing member is attached to a surface opposite to a surface of the concrete member which is a surface on which an object from the outside collides.   The method for reinforcing a concrete member according to claim 1, wherein the reinforcing material is made of fiber reinforced plastic.   The method for reinforcing a concrete member according to claim 1, wherein the reinforcing material is fixed to the concrete member with a fixing material.   The method for reinforcing a concrete member according to claim 4, wherein the fixing material is disposed at least at an end portion of the reinforcing material.   The method for reinforcing a concrete member according to claim 4 or 5, wherein at least a part of the fixing material is attached to the reinforcing material.   The method for reinforcing a concrete member according to any one of claims 4 to 6, wherein at least a part of the fixing material is inserted into a hole formed in the concrete member.   The method for reinforcing a concrete member according to claim 4, wherein the fixing material is made of reinforcing fibers.   The method for reinforcing a concrete member according to claim 8, wherein the reinforcing fiber constituting the fixing material is formed in at least one of a strand, a net fabric, a braid, and a twisted cord.   A concrete member reinforced by the method according to claim 1.

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