JP2009097292A - Anchor member, and reinforcement method for concrete member using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor member which can secure necessary strength as the anchor member and reduce site work, can maintain the linearity of reinforced fiber strands when the anchor member is inserted into the hole of a concrete member and can suppress the generation of voids or seal the voids in the anchor member during anchor work, preventing deterioration in anchor strength, and to provide an anchor method. <P>SOLUTION: The anchor member, formed of reinforced fiber strands, is used to reinforce concrete members. The reinforced fiber strands are disposed around a hollow core material in its longitudinal direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fixing member suitably used for a reinforced concrete structure or a steel reinforced concrete structure and a method for reinforcing a concrete member using the same, and a fixing member that is easy to handle and has good workability, and the fixing member. Related to the reinforcement method.

  Conventionally, in order to reinforce concrete structures such as columns and beams, a method of attaching a reinforcing fiber sheet such as carbon fiber to a concrete member has been used. This is one of the reinforcement methods against bending and shearing forces applied to pillars and the like, and is reinforced by winding a reinforcing sheet made of reinforcing fibers such as carbon fibers, aramid fibers, glass fibers, etc. around the entire circumference of the pillars, etc. .

  However, in the case of a column, when the column is provided with a wall, the entire circumference of the column cannot be wound with the reinforcing fiber sheet, and the construction is performed with the reinforcing fiber sheet being interrupted by the wall. However, in such a case, a sufficient reinforcing effect cannot be obtained, and there is a risk that the end portion of the reinforcing fiber sheet is peeled off due to seismic force or the like.

  Therefore, even when the wall is integrated with the pillar, a fixing member in which reinforcing fiber strands are bundled is inserted into the hole formed in the wall so as to bring about the same effect as winding the reinforcing fiber sheet all around. A fixing member and a fixing method in which the reinforcing fiber sheet that is fixed to the pillar with the impregnated adhesive resin and the reinforcing fiber strand that is not fixed to the hole is fanned out and bonded with the impregnated adhesive resin. It has been proposed (see Patent Document 1).

  However, in Patent Document 1, the number of fixing members bundled with reinforcing fiber strands is bundled by an operator directly from a paper tube around which reinforcing fibers are wound so that the number of fixing members bundled at a construction site is necessary. In some cases, mistakes may be made and the number of reinforcing fibers required to reinforce may not be reached. In addition, in the process of applying a fan-shaped fixing member to the reinforcing fiber sheet, the fixing member must be fan-shaped by the operator himself, but the single fibers of the reinforcing fiber strands are scattered, and the reinforcing fiber strands are irregular. It is difficult for the operator to spread the fan evenly.

  Therefore, in order to further improve the workability on site, the fixing member in which the reinforcing fiber strand is processed in advance in a factory or the like to improve the handleability has been proposed (see Patent Documents 2, 3, and 4). According to the known document, when the fixing member is inserted into the concrete hole, the bundled portion of the concrete hole and the bundled portion of the fixing member are applied and impregnated with an impregnating adhesive resin or the like and then bundled. Attach a rigid rod-like object, such as a metal rod or wire, to the tip of the rod, insert the rod-like object into a hole drilled in concrete, and insert the bundled part of the fixing member, Thereafter, the stick-shaped object is removed and the fixing operation is completed.

However, according to this method, after the fixing member is installed, it is necessary to pull out the rod-like object. At this time, the volume of the impregnated adhesive resin is reduced, and there is an adverse effect that a cavity is easily formed. Moreover, even if the cavity is generated, the inside cannot be confirmed, and even if a cavity is found and an attempt is made to remove the cavity, means for removing it is difficult. In addition, there is a possibility that the linearity of the reinforcing fiber strands may be damaged or damaged when the rod-shaped object is pulled out, which causes a decrease in strength or variation, and there is a fixing member that solves these problems and a method for reinforcing a concrete member using the fixing member. It was craving.
Japanese Patent No. 3918310 Japanese Patent Laid-Open No. 2004-27728 JP 2003-293598 A JP 2006-124945 A

Therefore, the present invention secures the necessary strength as a fixing member, reduces the work on site, and maintains the linearity of the reinforcing fiber strand when the fixing member is inserted into a concrete hole, and fixing. An object of the present invention is to provide a fixing member that can suppress or prevent the formation of a cavity in a fixing portion during work, and that can suppress a decrease in fixing strength, and a method for reinforcing a concrete member using the fixing member.

The present invention for solving the above-described problems has the following configuration. That is, the present invention is (1) a fixing member used for reinforcing a concrete member, wherein the fixing member is formed of a reinforcing fiber strand, and the reinforcing fiber strand is a core along the longitudinal direction of the hollow core material. A fixing member arranged around a material.

  (2) The fixing member according to (1), wherein fibers are covered outside the reinforcing fiber strands arranged around the core material.

  (3) The reinforcing fiber strand is described in (1) or (2), wherein a constraining yarn for constraining a single fiber constituting the reinforcing fiber strand is covered on a surface layer of the reinforcing fiber strand. Fixing member.

  (4) The fixing member according to any one of (1) to (3), wherein the hollow core member has a through hole formed in a circumferential direction.

  (5) A method for reinforcing a concrete member using the fixing member according to any one of (1) to (4), comprising a step of bonding a reinforcing fiber sheet to the concrete member, and attaching the fixing member to the concrete member A step of providing a hole; a step of inserting the fixing member into the fixing member mounting hole; a step of inserting an impregnating adhesive resin into a hollow portion of a hollow core material constituting the fixing member; A concrete member comprising a step of spreading out the reinforcing fiber strands of the portion that is outside, a step of removing the core material, a step of impregnating the reinforcing fiber strands that have been fanned out with an impregnating adhesive resin, and bonding them to the reinforcing fiber sheet It consists of the reinforcement method.

The fixing member of the present invention and the method of reinforcing a concrete member using the same are as follows:
(1) Since the reinforcing fiber strands are arranged in the circumferential direction along the longitudinal direction of the core material, the reinforcing fiber strand is reinforced when the fixing portion is inserted into the hole (fixing member mounting hole) opened in the concrete member. The linearity of the fiber strand is maintained, and the strength of the fixing member is hardly lowered.

  (2) Since the reinforcing fiber strands are arranged in the circumferential direction along the longitudinal direction of the hollow core material, when the fixing portion is inserted into the hole (fixing member mounting hole) opened in the concrete member In addition, since the core material is a reinforcing fiber strand insertion rod, there is no need to prepare a rod-like material for inserting the reinforcing fiber strand separately, and the step of attaching it to the fixing member can be omitted. The complexity of on-site work can be eliminated.

(3) Since the reinforcing fiber strands are arranged in the circumferential direction along the longitudinal direction of the hollow core material, it is not necessary to remove the core material by using the core material as a reinforcing fiber strand insertion rod. It is possible to prevent the reinforcing fiber strands from being disturbed easily when being pulled out, and it is not possible to form cavities generated when a rod-shaped object is pulled out at the fixing portion. Also, in order to fix the fixing member in the hole (fixing member mounting hole) opened in the concrete member more securely, it is possible to inject and fill the impregnating adhesive from the hollow portion after inserting the fixing portion. And can reliably impregnate the reinforcing fiber strands with the impregnated adhesive resin,
(4) Since the basic structure of the fixing member is completed before the construction site, the number of reinforcing fiber strands to be constructed is always constant, and there is no need for complicated bundling work at the construction site. The reliability of construction is improved.

Hereinafter, the fixing member according to the present invention and the method for reinforcing the concrete member by performing the fixing member will be described in more detail.

1A and 1B show an embodiment of a fixing member of the present invention, in which FIG. 1A is an enlarged perspective view and FIG. 1B is a sectional view.
In this embodiment, the fixing member 1 is a fixing member 1 formed of reinforcing fiber strands 2 used for reinforcing a concrete member, and the reinforcing fiber strands 2 are arranged along the longitudinal direction of the hollow core material 3. It shows what is evenly arranged in the circumferential direction.

  The fixing member 1 is arranged along the periphery of a hollow core material while arranging a predetermined number of reinforcing fiber strands 2 constituting the predetermined number, for example, 20 to 300 in one direction, and then a large number of reinforcing fiber strands 2 are arranged. It is preferable to cover the reinforcing fiber strands 2 with the fibers 4 so as not to leave the core material 3. In the embodiment shown in FIG. 1, reinforcing fiber strands are arranged uniformly and uniformly along a hollow core material.

  An embodiment when the fixing member 1 is fixed to the concrete member 5 is shown in FIG. The hollow core material 3 in which the reinforcing fiber strands 2 are arranged is inserted into a hole opened in the concrete, that is, the fixing member mounting hole 6, and the hollow fiber material in which the reinforcing fiber strands 2 are arranged. The outer side of the opposite side into which the core material 3 is inserted, that is, the end of the reinforcing fiber strand 2 protruding from the concrete member 5 is spread in a fan shape around the base of the concrete member 5 and pasted in advance. It becomes the structure affixed with the impregnation adhesive resin on the reinforcing fiber sheet 10 (refer FIG. 8).

  Next, the configuration of the fixing member 1 will be described with reference to FIG.

  One of the features of the present invention is that, as described above, the reinforcing fiber strands 2 are arranged in parallel in the circumferential direction of the hollow core material 3. In order to express the tensile strength originally possessed by the reinforcing fiber strands 2, by arranging the reinforcing fiber strands 2 in a straight line, a tensile load is evenly applied to the reinforcing fiber strands 2 and high strength is expressed. Further, since the reinforcing fiber strands 2 are arranged on the core material 3 in advance, it is not necessary to form a hook for installing the insertion rod or to prepare the insertion rod when inserting into the hole of the concrete member at the site. In addition, since it is not necessary to remove the fixing member 1 after inserting the fixing member 1 into the hole (fixing member attachment hole 6) formed in the concrete member as it is, the volume is reduced at the time of extraction, and a cavity is generated in the impregnated adhesive resin. The fixing member 1 can be reliably fixed to the concrete member.

  Here, the material and the outer cross-sectional shape of the hollow core material 3 are not particularly specified, but the material may be a general-purpose material such as metal, polyester, nylon, FRP, etc. If the material of the same material as the impregnated adhesive resin used by injecting into the fixing member mounting hole 6 for adhering the fixing member 1 and the concrete member 5 to the core member 3 is used, compatibility with the impregnated adhesive resin is also achieved. It is preferable because it can reduce the frequency of occurrence of adverse effects of adhesion inhibition. In consideration of the fact that epoxy resin is generally used as the impregnated adhesive resin, the hollow core material 3 is made of epoxy resin or FRP made by mixing fibers in epoxy resin. It is preferable that the adhesion between the fixing member 1 and the concrete member 5 is good.

  The outer cross-sectional shape of the hollow core material 3 may be circular or quadrangular, but is familiar with the impregnated adhesive resin injected into the perforated concrete member 5, that is, the impregnated adhesive resin and the hollow core. Considering the wettability of the material 3, the circular shape is good. If the reinforcing fiber strands 2 are arranged around the circular shape, the strength balance as the fixing member 1 is good, and the fixing member 1 is inserted into the fixing member mounting hole 6. At the same time, since there is no projecting portion, the reinforcing fiber strand 2 is not damaged, and the insertion becomes smooth.

  Further, as another feature, the core material 3 is hollow, and after the reinforcing fiber strand 2 is inserted into the concrete member 5, an additional impregnation adhesive resin is injected from the hollow portion of the core material 3. If the impregnation adhesive resin is insufficient, the resin can be filled from the lowermost part of the fixing member mounting hole 6 by supplying from the hollow portion of the core material 3. Even if there is a cavity or the like at the interface between the reinforcing fiber strand 2 and the interface between the reinforcing fiber strand 2 and the concrete member 5, it is possible to drive the cavity outside by filling the impregnated adhesive resin from the bottom. Stable fixing strength can be obtained. The hollow portion of the core material 3 only needs to be continuously present in the longitudinal direction of the core material 3 and preferably has no protrusions. Further, the cross-sectional shape of the hollow portion of the core material 3 is not particularly defined, but by making the cross-section circular like the outer peripheral cross-sectional shape of the core material 3, the impregnation adhesive resin can be easily and reliably injected. I can do it.

  Note that the above-mentioned “circular” refers to a set of points equidistant from a certain fixed point in terms of geometrical definition. However, unless the object of the present invention is impaired, a part that is partially flat or convex is used. If the shape has an area of 80% or more of the area of a circle circumscribing the shape, there is no problem as being “circular”.

  In order to arrange the reinforcing fiber strand 2 in the hollow core material 3 without impairing the tensile strength of the reinforcing fiber strand 2, the reinforcing fiber strand 2 is arranged linearly in the circumferential direction along the longitudinal direction of the hollow core material 3. Is good. FIG. 1 showing an embodiment of the present invention shows an example in which one reinforcing fiber strand is arranged in the circumferential direction along the longitudinal direction of a hollow core material having a circular cross section. Is not limited to this.

  When arranging the reinforcing fiber strands 2 in the hollow core material 3, diagrams showing other preferable arrangement forms are shown in FIGS. 3 to 6. The number of the reinforcing fiber strands 2 may be the required number designed and determined when the concrete member 5 is reinforced, and the reinforcing fiber strands are arranged around the core material 3 with respect to the required number. Good.

  Although the embodiment arrange | positioned concentrically with respect to the hollow core material 3 is shown in FIG. 3, it is not restricted to a double as shown in figure, A triple winding and a quadruple winding may be carried out according to a required number. good.

  FIG. 4 shows an embodiment in which the reinforcing fiber strands 2 are arranged with a bias with respect to the hollow core material, and after the fixing member 1 is inserted into the fixing member mounting hole 6 opened in the concrete member. When the reinforcing fiber strands 2 that are exposed to the outside are spread out in a fan shape and bonded to the reinforcing fiber sheet 10 (see FIG. 8), this is an example of an embodiment that can be efficiently fanned out.

  FIG. 5 shows an embodiment in which the hollow core material 3 is arranged like a figure 8, and after the fixing member 1 is inserted into the fixing member mounting hole 6 opened in the concrete member, it goes out to the outside. It is an example of the embodiment which spreads and constructs in the shape of figure 8, when the expanded surface is seen by expanding the reinforcing fiber strand 2 which is present.

  FIG. 6 shows an embodiment in which a unidirectional woven fabric in which reinforcing fiber strands 2 are arranged in one direction is spirally arranged around the core material 3, and the fixing member mounting hole 6 in which the fixing member 1 is opened in the concrete member. When the unidirectional woven fabric of the reinforcing fiber strands 2 that are exposed to the outside is spread in a fan shape, the reinforcing fiber strands 2 are already joined together by wefts, so that the reinforcing fiber strands 2 are spread evenly. be able to.

  In the embodiment shown in FIGS. 3 to 6, one of the preferable features is that the reinforcing fiber strands 2 are linearly arranged around the longitudinal direction of the hollow core material 3. As a result, the tensile strength as the fixing member 1 is not impaired, and fixing to the concrete member is possible. Therefore, the arrangement of the reinforcing fiber strands 2 can be freely set according to the construction method and the required number of reinforcing fiber strands. be able to.

  The reinforcing fiber strand 2 is a so-called multifilament which is a collection of about several hundred to several tens of thousands of single fibers of continuous reinforcing fibers, and is a filament that can be usually obtained depending on the material of the reinforcing fibers. Number is good. For example, in the case of carbon fiber, which is a typical reinforcing fiber, the number of filaments is usually in the range of 12,000 to 48,000. In addition, an epoxy resin-based sizing agent is usually applied to the carbon fiber monofilament in order to improve the bundling property. However, considering the impregnation property of the impregnated adhesive resin to the carbon fiber strand, it is 0. About 2% by weight is good. In the above description, for example, the case of carbon fiber has been described. However, the reinforcing fiber of other materials is not limited to this.

  In addition, as a material for the reinforcing fiber strand 2, in addition to carbon fiber, aramid fiber, PBO fiber, glass fiber, metal fiber, basalt fiber, etc. are generally used, and these may be used alone or in combination of two or more. Can do. From the viewpoint of reinforcing the concrete structure with the fixing member 1, fibers having high tensile strength and high Young's modulus are preferable. Carbon fiber can be preferably used when satisfying this characteristic and considering the results of reinforcement of concrete structures. The carbon fiber is a multifilament yarn in which 5,000 to 50,000 filaments having a single fiber diameter of about 5 to 8 μm are converged, and preferably a multifilament in which 12000 to 24000 filaments are converged can be suitably used. The tensile strength is 2,000 to 7,000 MPa, preferably 3,000 MPa or more. The tensile modulus is preferably 200 to 700 GPa, but is not limited to this as long as the adhesiveness with concrete member, fixing strength, compatibility with impregnated adhesive resin, and the like can be confirmed in advance.

  In the fixing member 1 of the present invention, the reinforcing fiber strands 2 are arranged on the core material in order to keep the reinforcing fiber strands 2 arranged on the hollow core material 3 from being scattered. It is preferable that the fiber 2 is covered from the outside of the strand 2 (see the thick line of the covering fiber in FIG. 1). The covering fiber 4 is a reinforcing fiber sheet 10 in which a fixing member is inserted into a concrete member, and then a portion protruding outside the concrete member is expanded into a fan shape or a circular shape and bonded in advance (see FIG. 8). In this case, the covering fiber 4 is cut and the constraint of the reinforcing fiber strand 2 is released. Therefore, the covering fiber 4 does not contribute to the fixing strength with the concrete member, and is intended to temporarily restrain the reinforcing fiber strand 2, and as a result, the handling property at the site is improved.

  As the fibers 4 for covering the reinforcing fiber strands 2 arranged on the hollow core material 3, natural fibers such as cotton, wool, hemp and silk, as well as organic fibers and inorganic fibers can be used. Cupra, viscose, polynosic, purified cellulose, acetate, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate, various synthetic fibers such as nylon and acrylic, and their copolymer types and the same or different types Composite fibers using polymers (side-by-side type, eccentric sheath core type, etc.) may be used, and carbon fiber, aramid fiber, glass fiber, etc. may be used. From the viewpoint of cost, polyester fibers and glass fibers are preferably used.

  The method for covering is not particularly limited. Generally, it may be produced by a covering machine, and the number of wrinkles of the covering yarn may be appropriately selected in consideration of the desired shape and texture of the covering yarn, but is preferably about 100 to 1000 T / m. As another method, the entire reinforcing fiber strands arranged in the hollow core material may be wrapped with a knitted or braided structure, and the reinforcing fiber strands only need to be retained so as not to be separated.

  In the fixing member 1 of the present invention, it is preferable that a constraining yarn for constraining a single fiber constituting the reinforcing fiber strand 2 is covered with the surface layer of the reinforcing fiber strand 2. Usually, the reinforcing fiber strand 2 is composed of multifilaments and is an aggregate of thin single fibers. Therefore, when the fixing member 1 is configured in such a state, handling properties are deteriorated such that single fibers protrude from the reinforcing fiber strands 2 or single fibers are damaged. Therefore, in the present invention, the surface layer of the reinforcing fiber strand 2 is covered with a restraining yarn for restraining a single fiber.

  As the fibers 4 for covering the reinforcing fiber strands 2 (see the thin lines of the covering fibers in FIG. 1), natural fibers such as cotton, wool, hemp, silk, and organic fibers and inorganic fibers can be used. Cupra, viscose, polynosic, purified cellulose, acetate, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate, various synthetic fibers such as nylon and acrylic, and their copolymer types and the same or different types Composite fibers using polymers (side-by-side type, eccentric sheath core type, etc.) may be used, and carbon fiber, aramid fiber, glass fiber, etc. may be used. From the viewpoint of cost, polyester fibers and glass fibers are preferably used.

  The covering fiber 4 may be wound only around the reinforcing fiber strand 2, but a part of the covering fiber 4 may be melted and a part of the reinforcing fiber strand 2 may be heat-sealed.

  The method for covering is not particularly limited. Generally, it may be produced by a covering machine, and the number of wrinkles of the covering yarn may be appropriately selected in consideration of the desired shape and texture of the covering yarn, but is preferably about 100 to 2000 T / m.

  Another preferable feature of the fixing member 1 of the present invention is that the hollow core material has through holes 9 formed in the circumferential direction. The through-hole 9 indicates that the hollow portion side of the core material and the side on which the reinforcing fiber strands are arranged penetrate as shown in FIG. By providing this through hole in the core material, (1) when the fixing member 1 is inserted into the concrete member 5, the impregnated adhesive resin previously applied in the fixing member mounting hole 6 is the hollow core material 3. It becomes easy to penetrate into the reinforcing fiber strand 2 outside the core material from the inside through the through hole 9. (2) After the fixing member 1 is inserted into the concrete member 5, the impregnation adhesive resin is insufficient, or the impregnation adhesion When there is a possibility that voids are generated in the resin, or when it is necessary to add an impregnating adhesive resin, when the impregnating adhesive resin is additionally injected into the hollow portion of the core material 3, It has been found that it is easy to penetrate the reinforcing fiber strands 2 disposed outside the core member 3 through the through holes 9 and to easily remove the cavities.

  Here, the size of the through hole 9 is not particularly limited as long as the impregnated adhesive resin can pass through the through hole 9, but the diameter is preferably about 0.5 mm to about 5 mm. The through-hole 9 can be formed with a normal drill or the like, but it is desirable to remove impurities such as cutting waste and oil generated during processing.

Further, the number of through holes 9 may be in a range that does not impair the purpose of the hollow core material 3, although it depends on the size of the through holes 9. That is, it is only necessary that the bundle of reinforcing fiber strands 2 can be inserted into the fixing member attachment hole 6 opened in the concrete member 5 to which the impregnated adhesive resin is applied. may be a number / 1 cm ² or so, often with one / 1 cm ² if the diameter 5 mm, in view of the size of the through hole 9, may I open a number that can achieve the purpose of the core material 3.

The fixing member 1 of the present invention is used as a reinforcing material for the concrete member 5, and as a method for reinforcing the concrete member using the reinforcing material, a step of adhering a reinforcing fiber sheet 10 to the concrete member 5, and fixing to the concrete member 5 A step of providing a member mounting hole 6; a step of inserting the fixing member into the fixing member mounting hole 6; a step of inserting an impregnating adhesive resin into the hollow portion of the hollow core member 3; From the step of fanning out the reinforcing fiber strand 2 of the portion that is outside, the step of removing the core material 3, the step of impregnating the reinforcing fiber strand 2 that has been fanned out with the impregnating adhesive resin, and bonding it to the reinforcing fiber sheet It is preferable to become.
The reinforcing method will be described in order with reference to the case of the embedded type fixing method, but the case of the penetration type fixing method is basically the same.

  For the step of adhering the reinforcing fiber sheet 10 to the concrete member 5, a generally used impregnation method for reinforcing fiber sheets can be used. The method of impregnating and bonding the reinforcing fiber sheet 10 is to cut the surface of the concrete member 5 with a disk grinder or the like, to remove the latency and dirt, and to make the concrete itself a clean surface. 5 and a primer for improving the adhesion between the impregnated adhesive resin and curing, followed by a step of smoothing the surface irregularities of the concrete member with a putty material, if necessary. After that, an impregnated adhesive resin as an adhesive is applied on the primer or putty material, and the reinforcing fiber sheet 10 is attached, and the impregnating adhesive resin is adhered to the reinforcing fiber sheet 10 while being impregnated by hand lay-up molding. Preferably there is.

  The impregnation with the impregnated adhesive resin means that the impregnated adhesive resin is immersed in the reinforcing fiber sheet 10 and further the reinforcing fiber strand 2 itself so that the reinforcing fiber and the impregnated adhesive resin are integrated. Further, as the reinforcing fiber sheet 10 here, in many cases, the reinforcing fiber sheet 10 is reinforced to a portion where a tensile force acts in the length direction, and therefore, a unidirectional sheet in which reinforcing fibers, for example, carbon fibers are arranged in one direction. Is frequently used. In addition, as the impregnating adhesive resin, an appropriately viscous resin is used in order to prevent dripping of the resin, and in many cases, an epoxy resin is frequently used from the viewpoint of adhesion to carbon fiber or the concrete member 5 and resin physical properties. However, the present invention is not limited to this.

  Subsequently, an attachment hole for fixing the fixing member 1 and a fixing member attachment hole 6 are provided in the concrete member 5. Although an example is shown in FIG. 8, when a beam is to be reinforced, a fixing member mounting hole 6 for inserting the fixing member 1 is provided at the base of the beam. In consideration of the mounting pitch of the fixing member 1 and the like, the positions where the holes are formed are marked, and then the holes are formed using an electric drill or the like. It is necessary to clean the dust and cutting waste adhering in the fixing member mounting hole 6 by blowing compressed air or the like or by sweeping it with a waste cloth. By doing so, since the reduction | decrease of the area which impregnation adhesive resin adhere | attaches a concrete member can be suppressed, or deterioration of adhesiveness can be suppressed, it is preferable to implement.

  Subsequently, it is a step of inserting the fixing member 1 into the fixing member mounting hole 6, and a generally performed method can be adopted. For example, an impregnating adhesive resin or putty material is applied in advance to the fixing member mounting hole 6, while the fixing member 1 of the present invention is impregnated with the impregnating adhesive resin in the concrete-embedded portion, and then the fixing member 1 is inserted into the fixing member mounting hole 6. As the impregnated adhesive resin used here, the impregnated adhesive resin on which the reinforcing fiber sheet 10 is applied may be used as it is, or an impregnated adhesive resin prepared separately may be used. Desirably, it is preferable to use a material that has been tested in advance and confirmed such as strength as CFRP and adhesion to a concrete member.

  In the present invention, when the fixing member 1 is inserted into the fixing member mounting hole 6, a step of attaching a normally required rod-like material is omitted, and as a result, there is no need to remove the rod-like material. The voids of the impregnated adhesive resin can be eliminated as much as possible while ensuring the linearity, and the fixing strength of the concrete member 5 and the fixing member 1 is increased and stabilized. Further, since there is no need to insert the insertion rod into the fixing member 1 into the concrete member 5 or to install the insertion rod on the fixing member 1, workability on the site can be improved.

  Then, it is the process of expanding the part of the reinforcing fiber strand 2 that protrudes from the fixing member attachment hole 6 into a fan shape or a circular shape. A portion in which the reinforcing fiber strands 2 are released by cutting the covering fibers 4 of the reinforcing fiber strands 2 retained in the core material 3 and peeling the reinforcing fiber strands 2 from the core material 3 and embedded in the concrete member 5 From the starting point, it becomes possible to expand it into a fan shape or a circular shape. At that time, the core material 3 where the reinforcing fiber strands 2 are spread, that is, the core material outside the concrete member 5 is not necessary, so it is preferable to cut off at the base portion of the concrete member 5.

  Here, when the fixing member 1 inserted into the concrete member 5 lacks the impregnated adhesive resin, or when a cavity is seen at the interface with the impregnated adhesive resin or the concrete surface, the impregnated resin is further impregnated from the hollow portion of the core material 3. By injecting the adhesive resin, the fixing property with the concrete member 5 can be further improved. If the core 3 is cut off at an acute angle depending on how it is cut, the reinforcing fiber strand 2 may be damaged. Therefore, the cut surface may be cut using a file or a thermal iron such as a soldering iron. It may be melted and rounded by using, or putty, clay, etc., or other plugs that cover the outer shape of the core material 3 may be used. May be.

  Next, the reinforcing fiber strands 2 expanded in a fan shape or a circular shape are coated and impregnated with an impregnating adhesive resin on the reinforcing fiber strands 2 in the same manner as the impregnating and adhering step of the reinforcing fiber sheet 10 to form beams or columns It adheres and fixes to the reinforced fiber sheet 10 that is affixed. As the impregnated adhesive resin used here, the impregnated adhesive resin on which the reinforcing fiber sheet 10 is applied may be used as it is, or a separately prepared impregnated adhesive resin may be used. Desirably, it is preferable to use a material that has been tested in advance and confirmed such as strength as CFRP and adhesion to a concrete member.

  When performing this construction, it is preferable to perform the construction so that the linearity of the reinforcing fiber strands 2 is not impaired when the reinforcing fiber strands 2 are expanded, as in the portion inserted into the concrete member 5. As a preferred embodiment of the present invention, when the reinforcing fiber strands 2 are covered, since the single fibers of the reinforcing fibers are not separated, it is easy to spread them linearly. Further, if necessary, it is preferable to connect the reinforcing fiber strands 2 to each other when they are expanded into a fan shape or a circular shape. The connecting means may be a general method, and the reinforcing fiber strand 2 may be retained in a woven fabric, a knitted fabric, or a lattice-shaped woven or knitted fabric, or may be connected only by a weft.

  As mentioned above, although the fixing member of this invention and the reinforcement method of the concrete member using the same have been demonstrated, as long as the objective of this invention is not impaired, it is not limited to an aspect and various deformation | transformation are possible. .

1 shows an embodiment of a fixing member of the present invention, (a) is an enlarged perspective view, and (b) is a sectional view. The conceptual diagram when fixing the fixing member of this invention to a concrete member is shown. An embodiment in which reinforcing fiber strands are arranged in a hollow core material for the fixing member of the present invention is shown. An embodiment in which reinforcing fiber strands are arranged in a hollow core material for the fixing member of the present invention is shown. An embodiment in which reinforcing fiber strands are arranged in a hollow core material for the fixing member of the present invention is shown. An embodiment in which a unidirectional woven fabric of reinforcing fiber strands is arranged in a hollow core material for the fixing member of the present invention is shown. The conceptual diagram by which the through-hole is formed in the circumferential direction of the hollow core material of the fixing member of this invention is shown. The conceptual diagram of the reinforcement method of the fixing member of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing member 2 Reinforcing fiber strand 3 Hollow core material 4 Covering fiber 5 Concrete member 6 Fixing member attachment hole 7 Reinforcing fiber strand unidirectional woven fabric 8 Weft yarn of unidirectional woven fabric 9 Through hole 10 Reinforcing fiber sheet 11 Beam

Claims (5)

A fixing member used for reinforcing a concrete member, wherein the fixing member is formed of a reinforcing fiber strand, and the reinforcing fiber strand is arranged around the core material along the longitudinal direction of the hollow core material. A fixing member. The fixing member according to claim 1, wherein fibers are covered outside the reinforcing fiber strands arranged around the core material. The fixing member according to claim 1, wherein the reinforcing fiber strand is one in which a binding yarn for binding a single fiber constituting the reinforcing fiber strand is covered on a surface layer of the reinforcing fiber strand. The fixing member according to claim 1, wherein the hollow core member has a through hole formed in a circumferential direction. A method for reinforcing a concrete member using the fixing member according to any one of claims 1 to 4, comprising a step of adhering a reinforcing fiber sheet to the concrete member, and a step of providing a fixing member attachment hole in the concrete member. A step of inserting the fixing member into the fixing member mounting hole; a step of inserting an impregnating adhesive resin into a hollow portion of a hollow core material constituting the fixing member; and a step protruding from the fixing member mounting hole. A method for reinforcing a concrete member, comprising: a step of spreading a part of reinforcing fiber strands into a fan shape; a step of removing a core; and a step of impregnating a reinforcing fiber strand that has been fanned out with an impregnating adhesive resin and adhering it to a reinforcing fiber sheet.

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