JP2011099206A - Device for anchoring fiber-reinforced resin plate, and method for reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for anchoring a fiber-reinforced resin plate, which does not deteriorate an appearance of a reinforced structure and which is excellent in constructibility, and a method for reinforcing the structure. <P>SOLUTION: This anchoring device 1 for anchoring an end of the fiber-reinforced resin plate 12, stuck on the surface of the structure, to the structure includes a pressing portion 2 which presses the fiber-reinforced resin plate 12 by being placed on the surface of the fiber-reinforced resin plate 12 in such a manner as to cross it, and a pair of anchors 3 and 3 which are provided on both the sides of the backside of the pressing portion 2 and embedded in the structure, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a fixing device for a fiber reinforced resin plate and a structure reinforcing method, and more specifically, a fixing device for preventing peeling of a fiber reinforced resin plate attached to the surface of a structure and a structure using the same. Reinforcement method.

  In recent years, construction methods using fiber reinforced resin (FRP), particularly carbon fiber reinforced resin (CFRP), have been widely used as a technique for seismically reinforcing concrete structures. There are two types of carbon fiber reinforced resin (hereinafter referred to as “CF sheet”) and plate-like resin (hereinafter referred to as “CF plate”), but the reinforcement method using the CF plate is in comparison with the method using the CF sheet. Since it has the advantage of being excellent in workability, it is particularly applied to construction sites that require upward work such as the lower ends of beams and slabs.

  When such a CF plate is reinforced by attaching it to a concrete structure such as a beam or slab, the end of the CF plate tends to peel off due to the bending moment acting on the concrete structure. There arises a problem that the reinforcing effect is reduced as a whole. This peeling is not a peeling of the adhesive between the CF plate and the concrete, but a phenomenon in which the surface portion of the concrete is broken by a tensile stress, and as a result, the peeling occurs in a state where the concrete piece adheres to the CF plate.

  For this reason, conventionally, a fixing tool is disposed on the end of the CF plate attached to the concrete structure, thereby pressing the end of the CF plate (see, for example, Patent Document 1). However, since the conventional fixing tool is fixed to the structure by anchor bolts embedded in the concrete structure and protruding from the fixing tool, and nuts screwed to the anchor bolts, the surface of the fixing tool does not become a flat surface. That is, the protrusions appear on the surface of the structure, and the appearance of the reinforcing structure is impaired. In addition, the bolt installation work process is indispensable at the time of construction.

JP-A-2005-68921

The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is to provide a fixing device for a fiber-reinforced resin plate and a structure reinforcing method that do not impair the appearance of the reinforcing structure and are excellent in workability.

The present invention employs the following means in order to achieve the above object.
That is, the present invention is a fixing tool for fixing the end portion of the fiber reinforced resin plate attached to the surface of the structure to the structure,
A pressing part that is placed on the surface so as to cross the fiber-reinforced resin plate and presses down the fiber-reinforced resin plate;
A fixing device for a fiber-reinforced resin plate, comprising a pair of anchors provided on both sides of the pressing portion and embedded in the structure.

  More specifically, a groove for receiving the fiber reinforced resin plate is formed on the back surface of the pressing portion. The pressing portion is a substantially rectangular plate.

Further, the present invention is a structure reinforcing method using the fixing tool,
Grounding the surface of the structure to be reinforced and drilling a pair of holes in place;
Applying an adhesive to the surface of the ground-treated structure and attaching a fiber-reinforced resin plate;
A resin is injected into the pair of holes, and the anchor of the fixing device according to any one of claims 1 to 3 is inserted into each hole, and the fixing device is mounted on the end surface of the fiber reinforced resin plate. A structure reinforcing method using a fiber reinforced resin plate, characterized by comprising a step of placing and fixing.

  According to the present invention, since the fixing tool is provided with a pair of anchors on the back surface of the pressing portion, the fixing member has a protrusion on the surface of the structure after fixing the fiber reinforced resin plate to the structure. There is nothing and the appearance is not impaired. Further, since the fixing tool is not attached to the structure with anchor bolts as in the prior art, the bolt attaching work process is not required and the workability is excellent.

1 shows an embodiment of a fixing device according to the present invention, wherein (a) is a plan view, (b) is a front view, and (c) is a bottom view. It is a figure which shows the procedure of a structure reinforcement construction method. It is sectional drawing which shows the fixing tool after construction.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the fixing device 1 according to the present invention includes a pressing plate 2 constituting a pressing portion and a pair of anchors 3 and 3. The holding plate 2 has a rectangular shape, and four corners are chamfered.

  Grooves 4 are formed on the back surface that serves as a pressing surface of the pressing plate 2. The groove 4 is for receiving the end of the CF plate and has a depth dimension (for example, 2 mm) substantially equal to the thickness dimension of the CF plate. As a result, the back surface of the pressing plate 2 and the surface of the reinforced concrete structure come to substantially coincide.

  The anchors 3 and 3 are provided so as to sandwich the groove 4 on both sides of the back surface of the pressing plate 2. The anchors 3 and 3 are rod-shaped having a predetermined length and diameter necessary for fixing. The anchors 3 and 3 have a circular cross section in the illustrated example, but may have a rectangular or other polygonal cross section. The fixing tool 1 is a cast steel product in which a presser plate 2 and anchors 3 and 3 are integrally formed by casting. The holding plate 2 and the anchors 3 and 3 can be formed separately, and the anchors 3 and 3 can be fixed to the holding plate 2 by welding, screwing, or other fixing means.

  Next, a concrete structure reinforcing method using the fixing tool 1 will be described with reference to FIG. Here, a CF plate is generally used as the reinforcing fiber resin plate. However, the reinforcing method described below is not particularly limited to the CF plate, and other reinforcing fibers such as glass fiber, aramid fiber, and the like. The same applies to the case of using an FRP plate made of organic fibers.

  First, as shown in FIG. 2A, the surface treatment of the surface 10 of the concrete structure to be reinforced such as a beam or a slab is performed. In other words, blasting or sanding is performed on the surface portion to which the CF plate is attached within a range slightly wider than the plate width to remove dust and dirt adhering to the surface. If there is a crack or the like, it is repaired by injecting resin. Then, a pair of holes 11 and 11 are drilled in the surface 10 subjected to the ground treatment. The holes 11 and 11 are for inserting the anchors 3 and 3, and the diameter and depth thereof are somewhat larger than the diameter and length of the anchor 3, respectively. The holes 11 and 11 are for a fixing device installed at one end of the CF plate. Although not shown, a hole for the fixing device installed at the other end is also drilled.

  Next, as shown in FIG. 2B, an adhesive is applied to the surface portion of the concrete to which the CF plate 12 is attached, and the CF plate 12 is attached. It is desirable to apply the adhesive to the CF plate 12 in order to improve the adhesion to concrete. After the CF plate 12 is attached, the surface of the CF plate 12 is pressed with a roller or the like so that no gap remains between the CF plate and the concrete.

  Next, as shown in FIG. 2C, the fixing device 1 is installed so as to cross the end of the CF plate 12, more specifically, at right angles to the length direction of the CF plate 12. . That is, the resin 13 (see FIG. 3) is injected into the holes 11 and 11, the anchor 3 of the fixing tool 1 is inserted into the holes 11 and 11, and the fixing tool 1 is placed and fixed on the surface of the CF plate 12. At this time, an adhesive may be applied to the back surface of the pressing plate 2 of the fixing tool 1 and the surface of the CF plate 12 which are in contact with each other. After the fixing tool 1 is installed, it is cured for a predetermined time and the construction is completed. Here, as the resin 13 to be injected into the adhesive and the hole 11, an epoxy resin conventionally used for this kind of reinforcement work can be used.

  According to the reinforcing method as described above, as shown in FIG. 3, the concrete structure after reinforcement by sticking the CF plate 12 has no protrusions protruding on the surface 10, and the appearance may be impaired. Absent. In addition, unlike the conventional fixing tool using anchor bolts, the bolt mounting operation process is unnecessary, so that the workability is excellent.

1 Fixing tool 2 Holding plate 3 Anchor 11 Hole

Claims (5)

A fixing tool for fixing an end of a fiber reinforced resin plate attached to a surface of a structure to the structure,
A pressing part that is placed on the end surface of the fiber reinforced resin plate so as to cross the fiber reinforced resin plate and presses down the fiber reinforced resin plate;
A fixing device for a fiber reinforced resin plate, comprising a pair of anchors provided on both sides of the pressing portion and embedded in the structure.   2. The fixing device for a fiber reinforced resin plate according to claim 1, wherein a groove for receiving the fiber reinforced resin plate is formed on a back surface of the pressing portion.   3. The continuous fiber reinforcing material fixing tool according to claim 1, wherein the pressing portion is a substantially rectangular plate. Grounding the surface of the structure to be reinforced and drilling a pair of holes in place;
Applying an adhesive to the surface of the ground-treated structure and attaching a fiber-reinforced resin plate;
A resin is injected into the pair of holes, and the anchor of the fixing device according to any one of claims 1 to 3 is inserted into each hole, and the fixing device is mounted on the end surface of the fiber reinforced resin plate. A structure reinforcing method using a fiber reinforced resin plate, characterized by comprising a step of placing and fixing.   The structure reinforcing method according to claim 4, wherein the fiber reinforced resin plate is a carbon fiber plate.

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