JP6051073B2 - Anchor, manufacturing method thereof, fixing tool, method of reinforcing structure using the same, and reinforced structure - Google Patents

Description

  The present invention relates to an anchor structure used as a fixing tool such as a reinforcing sheet for a concrete structure.

  As a method of repairing and reinforcing concrete structures such as reinforced concrete buildings, road bridges, and viaducts, a reinforcing sheet such as a carbon fiber sheet is attached to the surface of the structure, and the edges of this sheet are attached to many A method of fixing and fixing with an anchor formed by bundling carbon fibers is known.

As an anchor 100 used in such a construction method, as shown in FIG. 9, a fiber bundle is formed by bundling so that one or both ends thereof can be spread in a fan shape, and is affixed to a structure A structure is known in which the end of the anchor 100 spread in a fan shape is overlapped on a sheet for sheeting, and the reinforcing sheet is bonded and fixed by impregnating the entire bundled part of the fiber bundle and the part spread in a fan shape with an adhesive resin. (See, for example, Patent Document 1).
Further, as shown in FIG. 10, as an anchor 101 used for reinforcing a structure separated by partition walls such as beams and columns, a fiber bundle bundled in a rod shape is bent into an L shape and impregnated with an adhesive resin. The end of the anchor 101 is inserted into the through hole 102a provided in the partition wall 102, and the both ends of the anchor 101 are fixed to the end of the reinforcing sheet 103 wound around the surface of the structure with the partition wall 102 interposed therebetween. The thing of the structure which fixes is known (for example, refer patent document 2).

Japanese Patent No. 2003-293598 JP 2006-52633 A

The anchor 100 shown in FIG. 9 requires an operation of impregnating the anchor 100 with an adhesive resin at a construction site. Therefore, the construction takes time and effort, and the anchor 100 is fixed to the reinforcing sheet. Since labor is required, there is a problem that the fixing state (strength) is likely to vary depending on the skill level of the operator, and the construction quality is not stable.
In the anchor 101 in which the fiber bundle shown in FIG. 10 is solidified into an L shape, the work of impregnating the adhesive resin at the construction site is not necessary, but the fiber bundle bundled in a rod shape is simply bent into an L shape. Therefore, there is a problem that the fiber bundle at the bent portion is easily broken and the strength is remarkably lowered.

  In view of such a problem of the prior art, the present invention is formed by bending an anchor used for fixing a reinforcing sheet or the like into an L shape without reducing the strength, and using this, The task is to improve the work efficiency of repair and reinforcement work and to stabilize the construction quality.

In order to solve the above problems, the anchor of the present invention is an anchor in which a fiber bundle in which a large number of fibers are bundled is bent in an L shape and solidified by an impregnating adhesive,
It has a configuration in which both ends have a rod-like portion that is continuous to each other and a curved bent portion between both rod-like portions, and the bent portion is widened and provided in a flat shape.

According to this, since the bent part of the anchor is wider than the rod-like part and formed flat, stresses such as tensile stress and bending moment received by the anchor do not concentrate on one point of the bent part, Since it is dispersed in the widened part of the part, it can be provided with a strength close to the guaranteed strength of the fiber bundle, it is difficult to break or tear, and the reinforcing sheet or reinforcing plate attached to the structure It can be fixed firmly and firmly.
The anchor having the above structure is solidified by impregnating the adhesive resin in a state where the fiber bundle is bent in an L shape, so that the work of impregnating the adhesive resin at the construction site is unnecessary, and the work is eliminated and the work is eliminated. In addition to being simplified, regardless of the skill level of the operator, it is possible to reliably fix the reinforcing sheet and the reinforcing plate to stabilize the construction quality.

In the anchor of the above configuration, in order to increase the strength, the anchor has a configuration in which a bent portion is provided so as to gradually widen from the bent portion side end portion (B) of the rod-shaped portion toward the central portion (A) of the bent portion. It is preferable to have.
Further, the width of the bent portion is preferably the largest at the central portion (A), and the bent portion preferably has a size more than twice the width (D) of the rod-like portion.
Furthermore, the dimension (L) from the central part (A) of the bent part to the bent part side end part (B) of the rod-shaped part is provided larger than the width dimension (W) of the central part (A) of the bent part. It is preferable to have a configuration.
Moreover, it is preferable that the degree (curvature radius) which curves a bending part is about R20mm-40mm. If it is smaller than 20 mm, stress concentrates on the curved portion and the strength is lowered, and if it is larger than 40 mm, large chamfering is required and labor is required for processing, so the above range is appropriate.
By configuring the bent portion of the anchor as described above, the stress in the bent portion is further dispersed, and it becomes difficult for breaks and tears due to stress concentration to occur, and the shear stress of the anchor can be further increased.

The anchor configured as described above can be configured by a fiber bundle in which carbon fibers or aramid fibers are bundled.
As the carbon fiber, for example, a precursor fiber such as polyacrylonitrile-based carbon fiber (PAN-based), rayon-based carbon fiber, pitch-based carbon fiber, or polyvinyl alcohol-based carbon fiber can be used. Among these, a PAN-based high strength type which is a polyacrylonitrile-based carbon fiber obtained from an acrylonitrile polymer or a copolymer thereof is preferable. As an aramid fiber, an aromatic polyamide fiber can be used.
The anchor having the above-described configuration includes a step of bending a fiber bundle obtained by bundling a large number of fibers into an L shape, a step of widening a bent portion of the bent fiber bundle, and a portion other than the bent portion aligned in a rod shape. And the process of adjusting the diameter and the process of impregnating the fiber bundle with an adhesive resin and solidifying the fiber bundle. For example, a plurality of fiber strads in which a large number of fibers are bundled in a string shape are bundled into a rod shape, bent into an L shape, and the bent portion is widened as described above, and the diameter of the rod portion is restricted to a predetermined size. In such a state, it can be formed by impregnating with an epoxy resin adhesive as a sizing agent and solidifying.
Examples of the adhesive include polymerization / curing types such as epoxy, unsaturated polyester, phenol, vinyl ether, poly (meth) acrylate, polyurethane, melamine, maleimide, polyimide, polyolefin, polyester, acrylic, polyamide, pomiamideimide, polycarbonate, poly One kind of thermoplastic resins such as ether sulfone and polyether ether ketone, or a mixed resin of two or more kinds of them can be used.

The fixing device of the present invention includes the anchor having the above-described configuration and a fixing plate having a concave surface portion into which the rod-shaped portion of the anchor is engaged.
In order to reinforce a structure using this fixing tool, first, a reinforcing sheet or a reinforcing plate is attached to the surface of the structure separated by a partition wall such as a beam or a column, and an anchor rod shape is attached to the partition wall. A through hole having a size that allows the portion to be inserted therethrough, and then an end on one side of the anchor is inserted into the through hole from one side of the partition wall to expose the end on the other side of the partition wall Thereafter, the reinforcing sheet or the reinforcing plate is fixed and fixed by superimposing a fixing plate on the rod-shaped portion of the anchor on both sides of the partition wall and adhesively fixing it to the end of the reinforcing sheet or the reinforcing plate. it can.
Further, when reinforcing a portion other than the partition wall portion of the structure, first, a reinforcing sheet or a reinforcing plate is attached to the surface of the structure, and a hole portion having a depth into which the rod-like portion on one side of the anchor is inserted is provided. Then, after embedding a rod-like portion on one side of the anchor in the hole filled with adhesive resin and fixing one side of the anchor to the structure, a fixing plate is overlaid on the rod-like portion on the other side of the anchor Then, the reinforcing sheet or the reinforcing plate can be fixed and fixed by bonding and fixing to the end of the reinforcing sheet or the reinforcing plate.
In the structure reinforced in this way, the reinforcing sheet or the reinforcing plate attached to the surface is firmly and firmly fixed to increase the seismic strength, and the reinforced member has durability and fire resistance for a long time. It is possible to maintain the seismic strength after reinforcement.

It is an appearance perspective view of one embodiment of an anchor of the present invention. It is the top view (A) and side view (B) of the anchor of FIG. (A)-(C) are the figures for demonstrating the manufacturing process of an example of the anchor of this invention. It is an external appearance perspective view of the fixing plate which comprises a fixing tool with an anchor. FIG. 5 is a view showing a state in which an anchor is fixed by a fixing plate of FIG. 4 to fix a reinforcing sheet. It is the figure which showed the aspect of the structure of an example reinforced using the fixing tool of this invention. (A), (B) is a figure for demonstrating the procedure of the reinforcement construction of FIG. It is the figure which showed the aspect of the structure of the other example reinforced using the fixing tool of this invention. It is an external view of an example of the conventional anchor. It is the figure which showed the aspect which reinforces a structure using the anchor bent in the conventional L shape.

Preferred embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an embodiment of the anchor of the present invention. This anchor 1 is made up of a plurality of carbon fiber strands in which a large number of carbon fibers are bundled into a string to form a rod having an appropriate thickness. In the state where the bent portion is widened and flattened while being bent into a letter shape, the whole is impregnated with an adhesive resin and solidified.

Specifically, as shown in FIG. 1 and FIG. 2, the anchor 1 includes a rod-shaped portion 11, 11 having a circular cross section that is continuous with both ends 1 a, 1 b, and a curved bent portion between the rod-shaped portions 11, 11. The bent portion 12 is bent in an L-shape, and the bent portion 12 is gradually widened from the bent portion side ends B and B of the rod-like portions 11 and 11 toward the central portion A of the bent portion 12. It is provided. The widened bent portion 12 has the largest width W at the central portion A, and is provided in a size more than twice the width (diameter) D of the rod-like portion 11 (W> D × 2).
Further, the dimension L from the central part A of the bent part 12 to the bent part side end B of the rod-like part 11 is larger than the dimension of the width W of the central part A of the bent part 12 (L> W).
The lengths of the rod-like portions 11 on both sides of the bent portion 12 can be set to appropriate lengths.

Such an anchor 1 is formed by bundling a plurality of carbon fiber strands into a rod shape, bending the same into an L shape, widening the bent portion, and adjusting the diameter of the rod portion to a predetermined size and regulating it. In this state, it can be produced by a method of impregnating the fiber bundle with an adhesive resin and solidifying it.
If an example of the manufacturing process of the anchor 1 is shown, as shown in FIG. 3, four winding rods R are arranged in parallel at an appropriate interval (FIG. 3A), and the outer periphery of each winding rod R A predetermined number of carbon fiber strands FS are wound around and bundled together ((B) in the figure).
At this time, the carbon fiber strands FS that overlap the outer peripheral surface of each winding rod R that becomes the bent portion 12 are widened to a predetermined width, and the diameters of the portions that become the rod-like portions 11 on both sides of the bent portion 12 are predetermined. Adjust to the size of.
Then, the carbon fiber strand bundle FS bundled in this state is impregnated with an adhesive resin and solidified, and then the carbon fiber strand bundle FS solidified in a ring shape along the winding rod R is cut between the winding rods R. (Fig. 3C). The manufacturing process of the anchor 1 is not limited to this.

FIG. 4 shows a fixing plate 2 that constitutes the fixing device 3 together with the anchor 1, and this fixing plate 2 is provided with a concave portion 21 into which the rod-like portion 11 of the anchor 1 is engaged at the center of the flat plate surface. Formed.
As shown in FIG. 5, the fixing device 3 composed of the anchor 1 and the fixing plate 2 has a rod-like shape of the anchor 1 at the end of the reinforcing sheet 5 made of a carbon fiber sheet or the like attached to the surface of the structure 4. The fixing plate 2 with the portion 11 sandwiched between the concave portions 21 is overlapped, and this is adhered to the end surface of the reinforcing sheet 5 so that the reinforcing sheet 5 is fixed and fixed at the attaching position.

FIG. 6 shows a mode in which the structure 4 separated by a partition wall 41 such as a beam or a column is reinforced using the fixing device 3 having the above-described configuration.
First, as shown in FIG. 7A, the reinforcement in this case is performed by sticking the reinforcing sheet 5 to the surface of the structure 4 separated by the partition wall 41 and the rod-shaped portion of the anchor 1 on the partition 41. 11 is formed, through which the end 1a on one side of the anchor 1 is inserted into the through hole 41a from one side of the partition wall 41, and the end 1a of the anchor 1 is inserted into the partition wall. After being exposed to the other side of 41, as shown in FIG. 4B, the rod-like parts 11, 11 of both ends 1 a, 1 b of the anchor 1 are sandwiched between the fixing plates 2 on both sides of the partition wall 41 and fixed. The reinforcing sheet 5 is bonded to both ends of the anchor 1 by bonding the plate 2 to the end of the reinforcing sheet 5, so that the reinforcing sheet 5 is attached to the surface of the structure 4 around the partition wall 41. Fixed and fixed.

FIG. 8 shows a mode in which the reinforcing plate 6 is pasted on the surface of the structure 4 and reinforced.
In this case, first, the reinforcing plate 6 is attached to the surface of the structure 4, and the hole 4b having a depth into which the rod-like portion 11 on one side of the anchor 1 is immersed is formed. The anchor 1 is fixed to the structure 4 by being embedded in the hole 11b on the end 1a side of the anchor 1 in a state where the adhesive resin is filled, and then the rod 11 on the end 1b of the anchor 1 is fixed to the fixing plate 2. The fixing plate 2 is bonded to the end portion of the reinforcing plate 6 by being sandwiched, and the end portion of the reinforcing plate 6 is bonded to the end portion 1 b of the anchor 1, so that the reinforcing plate 6 is fixed to the surface of the structure 4. It can be fixed.

  Next, the result of verifying the strength of the anchor 1 formed by bundling carbon fiber strands will be described.

[Example 1]
Using 64 carbon fiber strands composed of 24,000 PAN-based high-strength carbon fiber filaments, and bundling them and bending them in an L shape, the resin is impregnated with an epoxy resin adhesive and solidified. 1 was formed.
The anchor 1 has a fiber cross-sectional area of the rod-shaped portion 11 of 55.68 mm ² (diameter D is approximately 12 mm), a width W of the central portion A of the bent portion 12 is 26 mm, and the central portion A of the bent portion 12 extends from the central portion A to the rod-shaped portion 11. The dimension L from the bent portion side end portion B was set to 30 mm, the length from the central portion A of the bent portion 12 to both end portions 1a and 1b was set to 600 mm, and two pieces having the same size were formed.

[Example 2]
Except that the width W of the central portion A of the bent portion 12 is set to 40 mm and the dimension L from the central portion A of the bent portion 12 to the bent portion side end B of the rod-shaped portion 11 is set to 130 mm, the same as in Example 1. Two anchors 1 were formed.

[Comparative Example]
Using 74 carbon fiber strands made of 24,000 PAN-based high-strength carbon fiber filaments, bundled and bent in an L shape, impregnated with epoxy resin adhesive, solidified and anchored Formed. Unlike the previous example, the formed anchor was not subjected to the treatment of widening the bent portion to make it flat, but solidified with the impregnating resin while the fiber bundle was bent at a right angle.
The fiber cross-sectional area of the anchor rod-like portion is 64.00 mm ² (diameter D is about 14.0 mm), the width W of the bent portion central portion A is 14 mm, and both ends from the bent portion central portion A are 14 mm. The length to the part was set to 600 mm, and two pieces having the same dimensions were formed.

For a total of eight anchors formed in both Examples and Comparative Examples, the maximum proof strength at which the anchor breaks is measured with a tensile tester that pulls both ends of the anchor in the respective axial directions, and the stress at that time is obtained. It was compared with the guaranteed strength of the strand. The results are shown in Table 1. The guaranteed strength of the carbon fiber strand is 3400 N / mm ² .

According to the measurement results, even in the molded product obtained by bending the carbon fiber bundle into an L shape, as in Example 2, by widening the bent portion and appropriately setting the degree of widening from the rod-shaped portion, It can be confirmed that the strength of 60% or more of the guaranteed strength of the carbon fiber strand before molding can be provided.
Further, from the measurement results of both examples, by appropriately setting the width W of the central portion A of the bent portion of the anchor and the dimension L from the central portion A of the bent portion to the bent portion side end portion B of the rod-shaped portion. It can be confirmed that the anchor 1 can be formed to a desired strength. For example, when forming an anchor using 96 carbon fiber strands, the width W of the central portion A of the bent portion of the anchor is about 45 mm in order to give the necessary strength, and the bent portion from the central portion A of the bent portion is bent. The dimension L to the part-side end B can be set to about 170 mm.

  In addition, the form of the illustrated anchor 1 and fixing plate 2 and the work process for reinforcing the structure 4 are examples, and the present invention is not limited to these, and can be configured in other appropriate forms and work processes. It is.

DESCRIPTION OF SYMBOLS 1 Anchor, 11 Bar-shaped part, 12 Bending part, 2 Fixing board, 3 Fixing tool, 4 Structure, 41 Partition part, 5 Reinforcing sheet, 6 Reinforcing board, R Winding stick, FS Carbon fiber strand

Claims (10)

An anchor formed by bundling a large number of fibers bent into an L shape and solidified by an impregnating adhesive,
An anchor having a structure in which a bent portion and a bent portion between the two rod-shaped portions are connected to both ends, and the bent portion is widened and provided in a flat shape.   The anchor according to claim 1, wherein the anchor has a configuration in which a bent portion is provided so as to gradually widen from the bent portion side end portion (B) of the rod-shaped portion toward the central portion (A) of the bent portion.   The anchor according to claim 1 or 2, wherein a width of the bent portion is the largest in the center portion (A), and the bent portion has a structure provided at a size more than twice the width (D) of the rod-like portion. .   The dimension (L) from the central part (A) of the bent part to the bent part side end part (B) of the rod-shaped part is configured to be larger than the width dimension of the central part (A) of the bent part. The anchor according to any one of claims 1 to 3.   The anchor according to any one of claims 1 to 4, wherein the anchor is constituted by a fiber bundle in which carbon fibers or aramid fibers are bundled.   A step of bending a fiber bundle in which a large number of fibers are bundled into an L shape, a step of widening a bent portion of the bent fiber bundle, and adjusting the diameter of the portions other than the bent portion by aligning them in a rod shape. An anchor manufacturing method comprising: a step; and a step of impregnating the fiber bundle with an adhesive resin and solidifying the fiber bundle.   A fixing device comprising the anchor according to any one of claims 1 to 5 and a fixing plate having a concave surface portion into which a bar-shaped portion of the anchor is engaged. A method for reinforcing a structure using the fixing tool according to claim 7,
Affixing a reinforcing sheet or reinforcing plate to the surface of the structure separated by partition walls such as beams and pillars, and forming a through-hole having a size into which the rod-shaped portion of the anchor can be inserted in the partition wall,
After one end of the anchor is inserted into the through hole from one side of the partition wall and the end is exposed to the other side of the partition,
A structure characterized in that the reinforcing sheet or the reinforcing plate is fixedly fixed by superimposing a fixing plate on the rod-shaped portion of the anchor on both sides of the partition wall and adhesively fixing it to the end of the reinforcing sheet or the reinforcing plate. Reinforcement method. A method for reinforcing a structure using the fixing tool according to claim 7,
Affixing a reinforcing sheet or reinforcing plate to the surface of the structure, and forming a hole with a depth into which the bar on one side of the anchor is immersed,
After embedding a rod-shaped part on one side of the anchor in the hole filled with adhesive resin and fixing one side of the anchor to the structure,
Reinforcing a structure characterized in that a fixing plate is superposed on a rod-like portion on the other side of an anchor and adhesively fixed to an end portion of the reinforcing sheet or the reinforcing plate, thereby fixing and fixing the reinforcing sheet or the reinforcing plate. Method.   A structure in which a reinforcing sheet or a reinforcing plate is fixedly fixed by the reinforcing method according to claim 8.

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