JPH1144047A - Reinforced structure of concrete construction by use of continuous fiber sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a continuous fiber sheet from peeling off, by providing a member making obtuse angles at the internal angle face of a rigid connection part of a concrete structure and sticking a continuous fiber sheet on the surface thereof. SOLUTION: A member 5 making obtuse angles is provided at the internal angle face of a rigid connection part 3 and a continuous fiber sheet 4 is stuck on the face to be reinforced with a low temperature-setting resin adhesive. Thereafter, the lower end of the continuous fiber sheet 4 is fixed to a concrete foundation member 2 through steel plates 6 by anchor bolts 7. The continuous fiber sheet 4 is arranged to wrap up the structure and fixed to the range from the upper part than the member making obtuse angles to the member 5. Then, a necessary finish treatment is applied and encasing concrete is preferably placed in the root of a reinforced concrete columnar body to reinforce the columnar body. Accordingly even when a stress arises in the tensile direction of the fiber sheet, the sheet is not easily peeled off and hence, the reinforcing effect of the continuous fiber sheet is sufficiently brought out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reinforcing a concrete structure having a rigid joint such as a base of a concrete structure such as a bridge or an elevated road pier, or a joint of a ramen structure or the like. In particular, even when excessive stress occurs in the concrete structure, the continuous fiber sheet for reinforcement attached over the inner corner surface or the outer corner surface of the rigid joint of the concrete structure is less likely to peel off, and good reinforcement can be performed. The present invention relates to a reinforcing structure for a concrete structure using a continuous fiber sheet.

[0002]

2. Description of the Related Art In recent years, it has been required to perform bending reinforcement on concrete structures such as bridges and piers of elevated roads and architectural structures to prevent earthquakes. Conventionally,
As one method for reinforcing a concrete structure, as shown in FIG. 1, a continuous fiber sheet (a continuous fiber sheet in which reinforcing fibers such as carbon fibers are arranged from the base of a concrete structure (1) to the surface of a base member (2)). A method has been proposed in which 4) is attached and reinforced along the axial direction of the concrete structure.

However, such a continuous fiber sheet is
When applied over the inner corner surface (3) of the rigid joint portion of the concrete structure, that is, the inner surface of the corner portion (3) formed by the longitudinal member and the lateral member of the concrete structure, when a stress is applied, the continuous fiber sheet is applied. However, there is a problem that the toner is easily peeled off and there is no method for fixing well. That is, for example, as shown in the sectional views of FIGS. 1 and 2A, the lower end of the conventional continuous fiber sheet (4) is connected to the base (1) of the concrete structure and the base member (2). In the method of bending at the corners (3) formed between them and attaching and fixing the corners on the surface of the base member (2), as shown in FIG. 2 (b), when a large bending moment is generated in the concrete structure In addition, there is a problem that the fiber sheet (4) attached to the base member is easily peeled off, and the reinforcement cannot be sufficiently exhibited.

[0004] Further, even in a concrete building having a rigid frame structure in which members are rigidly connected to each other, which is one of the structural types of the building, a method has been attempted in which a continuous fiber sheet is stuck over the rigid joint to reinforce it. However, when strong stress is generated in one direction, peeling occurs at the rigid joint, and similarly, there is a problem that the continuous reinforcing fiber sheet attached to the inner corner surface of the rigid joint is easily peeled off.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent a continuous fiber sheet attached to a portion extending over an inner corner of a rigid joint of a concrete structure from being peeled off by a simple method, and to provide a sufficient fixing strength. By having
An object of the present invention is to provide a method for reinforcing a concrete structure using a continuous fiber sheet, which makes it possible to sufficiently exert the reinforcing effect of the continuous fiber sheet for reinforcement.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and the gist of the present invention is to attach a continuous fiber sheet to a portion of a concrete structure having a rigid joint, which extends over an inner corner of the rigid joint. In a reinforcing structure of a concrete structure to be reinforced by using a continuous fiber sheet, an obtuse angled member is provided on an inner corner surface of a rigid joint of the concrete structure, and a continuous fiber sheet is attached to the surface. A reinforcing structure for a concrete structure using a continuous fiber sheet, wherein a continuous fiber sheet is attached to a portion extending over the outer corner surface of the rigid joint. More preferably, a component using a continuous fiber sheet, further comprising a fixing means provided on the continuous fiber sheet stuck on the continuous fiber sheet provided with the obtuse angle member. In the reinforcing structure of the REIT structure.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
1 and 2 (a) and 2 (b) show a conventional reinforcing structure for a concrete structure to which the present invention is not applied. On the other hand, FIGS. 3, 4 and 5 are cross-sectional views each showing an example of the reinforcing structure of the present invention. The reinforcing structure of the present invention,
It is used not only for reinforcing a so-called prismatic concrete structure and its base shown in FIGS. 3 and 4, but also for reinforcing joints between structural elements of a ramen structure as shown in FIG. 5.

In FIG. 3 and FIG. 4, the base (1) of the concrete structure serving as the vertical member and the base member (2) serving as the horizontal member are joined at substantially right angles to each other, and the corner (3) is formed. Formed. The structural elements shown in FIG. 5 are also joined at substantially right angles to form corners (3). Since these are a type of rigid joint, they are referred to as rigid joints in the present invention. In the present invention, a reinforcing continuous fiber sheet (4) is attached to a portion extending from the surface of the longitudinal member (1) to the surface of the lateral member (2) to the inner corner surface of the rigid joint. Furthermore, in particular, in the case of reinforcing the joint portion of the ramen structure, it is preferable to attach a continuous fiber sheet for reinforcement also to a portion extending over the outer corner surface. When the purpose is bending reinforcement, it is preferable to attach a continuous fiber sheet so that the fiber arrangement direction of the continuous fibers is along the axial direction of the concrete structure.

As the reinforcing fibers of the continuous fiber sheet (4), various fibers such as carbon fiber, glass fiber, boron fiber, steel fiber, aramid fiber, polyester fiber and polyethylene fiber can be used.
It is preferable to use carbon fibers. In addition, in order to reinforce the lower part of the concrete column to be erected, the breaking strain is 20,000 from the lower end to the plastic hinge section.
A fiber sheet of 0 μm or more (measured by JISR 7073 method) is used, and a tensile modulus (J
It is preferable to use a fiber sheet having a tensile modulus of 2.1 × 10 ⁶ kgf / cm ² or more.

As the fiber sheet, a prepreg sheet in which fibers are impregnated with a matrix resin in advance may be used, or a dry sheet of fibers may be used, but it is preferable to use a prepreg sheet. Examples of the resin to be impregnated into the prepreg sheet include a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, and a polyurethane resin or a room temperature-curable resin, and a two-pack curing room-temperature curable resin is particularly preferable.

The sheet is preferably a unidirectional sheet in which long fibers are arranged in one direction, but a woven sheet in which fibers arranged in one direction are combined with fibers arranged in the other direction may be used. According to the present invention, in the structure in which the continuous fiber sheet (4) is attached to a portion extending over the inner corner surface of the rigid joint of the concrete structure having such a rigid joint, an obtuse angle is previously set to the inner corner surface of the rigid joint of the concrete structure. The forming member (5) is provided, and a continuous fiber sheet is attached to the surface thereof.

The obtuse angled member (5) means a member having a role of substantially obtuse the inner angle of the rigid joint, which is a substantially right angle. For example, as shown in FIG. 3 and FIG. The member (5) is formed by bending the member (5) so that a right angle portion is provided at the inner angle of the rigid joint, or as shown in FIG. Are installed such that both ends abut against the vertical and horizontal members of the concrete structure. It is also preferable to combine the obtuse member of FIG. 3 with the obtuse member of FIG.

The material of the obtuse member (5) is not particularly limited to concrete or mortar or another material such as a steel plate. For example, in the case of the obtuse member shown in FIG. It is preferable to apply and form integrally with the concrete structure. In the case of the obtuse angled member illustrated in FIG. 4, it is preferable to use a steel sheet that has been formed in advance. The size of the obtuse angle member can be appropriately selected depending on the size of the concrete structure to be applied. For example, it is preferable that the obtuse angle member covers a range of several centimeters to several tens of centimeters from a corner.

According to the present invention, when a continuous fiber sheet is stuck on the obtuse angle-providing member, the structure shown in FIG.
Although the continuous fiber sheet was easily peeled off by the resultant force A shown by the arrow in (a), the resultant force A shown in FIG. 3 was reduced, and peeling could be suppressed. In the present invention, it is preferable to employ the following fixing means in order to further suppress the separation of the continuous fiber sheet. In one embodiment, as shown on the left side of FIG. 3 and the like, a continuous fiber sheet is pressed to a concrete member by an anchor bolt (7) holding a steel plate (6) and an anchor bolt (10) holding a steel plate (9). There is a fixing structure.

As shown in FIGS. 3 and 5, the continuous fiber sheet is adhered and then wound with another continuous fiber or continuous fiber sheet so that the fiber direction is the circumferential direction of the concrete structure. There is a fixing structure. As the fibers to be used, those having a reinforcing effect are preferable, for example, various fibers such as carbon fiber, glass fiber, boron fiber, steel fiber, aramid fiber, polyester fiber, and polyethylene fiber can be used. It is preferable to use carbon fiber. It is preferable that the fixing part by the winding is wound around a plastic hinge section (a section of about 1D to 2D when one side of the column is D) from a corner. Further, as shown in FIG. 4, a pressing member (6 ') having the same shape as the obtuse member is employed on the continuous fiber sheet adhered on the obtuse member, and the press member is applied to a concrete structure. The fixing structure is also preferable in that the peeling of the continuous fiber sheet is effectively suppressed.

The outline of the reinforcing method of the present invention will be described with reference to FIG. 3. First, the continuous fiber sheet made of a prepreg sheet or a dry sheet is prepared, and on the surface of the concrete structure (1) to be reinforced. If necessary, a base treatment and a primer treatment are performed.

Thereafter, an obtuse angle member is provided on the inner corner surface of the rigid joint, and a continuous fiber sheet is adhered to the reinforcing surface using an adhesive resin, preferably a room temperature-curable adhesive resin. . Then, the lower end of the continuous fiber sheet is fixed to the concrete foundation member by the anchor bolt (7) via the steel plate (6). On the other hand, the continuous fiber is wound around the structure and fixed from above the obtuse member to the obtuse member. Thereafter, a necessary finishing treatment is performed, and preferably, a root-wrapped concrete is poured into a root portion of the reinforced concrete column to reinforce it.

[0018]

As described above, by employing the structure of the present invention, even when stress is generated in the direction of pulling the fiber sheet, the fiber sheet is hardly peeled off, and the reinforcing effect of the continuous fiber sheet for reinforcement is reduced. , Fully demonstrated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a conventional concrete reinforcing method.

FIG. 2A is a sectional view showing an example of a conventional concrete reinforcing method, and FIG.

FIG. 3 is a perspective view showing an example of the concrete reinforcing method of the present invention.

FIG. 4 is a sectional view showing an example of the concrete reinforcing method of the present invention.

FIG. 5 is a perspective view showing an example of the concrete reinforcing method of the present invention.

[Explanation of symbols]

1: concrete structure (longitudinal member), 2: concrete structure (lateral member), 3: rigid joint, 4: continuous fiber sheet, 5: obtuse angled member, 6: steel plate, 6 ': holding member, 7: anchor bolt, 8: wound fiber, 9: steel plate, 1
0: Anchor bolt

Claims (3)

[Claims] 1. A reinforcing structure for a concrete structure in which a continuous fiber sheet is attached to a portion of the concrete structure having a rigid joint and extending over an inner corner surface of the rigid joint to reinforce the concrete structure.
A reinforcing structure for a concrete structure using a continuous fiber sheet, wherein an obtuse angle member is provided on an inner corner surface of a rigid joint portion of the concrete structure, and a continuous fiber sheet is attached to the surface. 2. The reinforcing structure for a concrete structure using a continuous fiber sheet according to claim 1, wherein a continuous fiber sheet is further adhered to a portion extending over an outer corner of the rigid joint. 3. Reinforcement of a concrete structure using a continuous fiber sheet according to claim 1 or 2, wherein a fixing means is further provided on the continuous fiber sheet attached on the obtuse angled member. Construction.