JP2000054647A - Method and device for reinforcing concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for simplying and inexpensively reinforcing various sizes of concrete structures and a device suitable thereto. SOLUTION: A fiber reinforcing resin molding plate 2 formed with multilayer reinforcing fiber sheets solidified by resin is pasted to the peripheral face of a concrete structure 1 constituting a civil construction to reinforce the structure. In this case, the fiber reinforcing resin molding plate is formed as an unimpregnated portion where a plate portion 7 solidified by resin is provided at a space 6 in the middle of the reinforcing fiber sheet without resin impregnation at both ends of the sheets and in the space. When the fiber reinforcing resin molding plate is pasted to the structure, the reinforcing fiber sheets in the space and at both ends are impregnated with resin adhesive and resin adhesive 3 is applied to the single face of the plate portion to be pasted to the peripheral face of the structure to press the fiber reinforcing resin molding plate against the peripheral face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing method and a reinforcing device for reinforcing structures such as concrete pillars and piers which constitute civil engineering structures such as buildings and bridges.

[0002]

2. Description of the Related Art Conventionally, a reinforcing fiber sheet impregnated with a resin is wound around and adhered to a columnar body such as a concrete column or a bridge pier for seismic resistance reinforcement and aging prevention. Is being done. In this case, the reinforcing fiber sheet is manufactured by weaving reinforcing fibers, such as glass fiber, carbon fiber, and aromatic polyamide fiber, having higher tensile strengths than concrete, into a sheet shape with the fiber directions aligned. As a reinforcing method, a resin-impregnated resin layer is impregnated into a single-layer or multi-layered reinforcing fiber sheet, and cured into a shape of a divided body conforming to the peripheral surface shape of a columnar body to be reinforced, thereby forming a fiber-reinforced resin molded plate in advance. In addition, as shown in FIG. 1, the fiber-reinforced resin molded plate b is annularly arranged along the peripheral surface of the columnar body a which has repaired cracks and has been cleaned, and the peripheral surface and the molded plate b A method of injecting and attaching grout during the process is performed. The use of such a fiber-reinforced resin molded plate b is advantageous in that the reinforcing operation can be performed more quickly on site than by winding a reinforcing fiber sheet around a columnar body and then impregnating the sheet with a resin.

[0003]

The fiber reinforced resin molded plate b is formed in a divided state so as to be able to circulate around the columnar body a, and an adhering plate c is adhered to the divided portion to form the columnar body a. When the grout is formed into an annular body that continuously surrounds the peripheral surface, and the grout is formed in the gap between the columnar body a and the molded plate b and the two are integrated, expansion deformation when an axial compressive load is applied to the columnar body a The reinforcement is prevented by the reinforcing resin molded plate b, and a reinforcing action for increasing the strength of the columnar body a is performed. The adhering plate c is made of a resin plate reinforced with reinforcing fibers in the same manner as the fiber-reinforced resin molded plate b.
When the forming plate b is composed of one layer of the reinforcing fiber sheet d as in the above, the abutment plate c is adhered to the outer surface of the abutting portion of the forming plates b and a force is applied between the reinforcing fiber sheets d. Are connected in a complete ring to be transmitted. When the formed plate b has two layers of the reinforcing fiber sheet d as shown in FIG. 3, the attachment plates c and c are bonded to both inner and outer surfaces of the butted portion, and the respective layers are connected in a ring shape.

However, in the prior art, the contact plate c can be bonded only to the inside and outside of the abutting portion. In a fiber reinforced resin molded plate having more than one layer, each layer cannot be formed in an annular shape by the attachment plate c, and the reinforcing ability is the same as that of the two layers. For this reason, it was difficult to perform reinforcement that required providing three or more layers of the reinforcing fiber sheet d.

[0005] One or more layers of the reinforcing fiber sheet are impregnated with a resin and cured into a shape of a divided body conforming to the peripheral surface shape of the columnar body to be reinforced to form a fiber reinforced resin molded plate in advance. Expensive mold is required, the dimensions of the pillars vary depending on the building to be reinforced, so various types of molds must be prepared, there is a disadvantage that the production cost is high,
Since the formed plate b is not flexible, it cannot be bonded to the column a with an adhesive, and grout must be injected between the formed plate b and the surface of the column a to be integrated. Not
It is necessary to provide a support material to prevent the molded plate b from being bent at the time of the injection, and there is a disadvantage that the injection operation requires relatively skill and cannot be easily performed.

An object of the present invention is to provide a method for simply and inexpensively reinforcing concrete structures such as columns and beams of various sizes, and a reinforcing device suitable for the method.

[0007]

According to the present invention, a fiber-reinforced resin molded plate obtained by solidifying and forming a multi-layered reinforcing fiber sheet with a resin is attached to the peripheral surface of a concrete structure constituting a civil engineering building structure. In the reinforcing method for reinforcing the structure, a plate-like portion obtained by solidifying the fiber-reinforced resin molded plate with a resin at intervals in the middle of the reinforcing fiber sheet is provided, and both ends of the sheet are provided. And the interval is configured as an unimpregnated portion that is not impregnated with the resin, and when the fiber-reinforced resin molded plate is attached to the structure, the reinforcing fiber sheet at the interval and both ends is impregnated with a resin adhesive. The above-mentioned object is achieved by applying a resin adhesive to one surface of the plate-shaped portion and sticking it to the peripheral surface of the structure, and pressing the fiber-reinforced resin molded plate against the peripheral surface. . At each end of the multi-layered reinforcing fiber sheet constituting the fiber-reinforced resin molded plate, separated ends are formed separately for each reinforcing fiber sheet, and a resin-impregnated intermediate portion of the reinforcing fiber sheet is solidified to form a plate. By forming the portion with an interval not impregnated with the resin, a reinforcing device suitable for reinforcing the structure of various dimensions is obtained, and on the surface of the plate-like portion,
By providing a finishing material such as mortar, paint, or the like, the reinforcement work is facilitated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 4, reference numeral 1 denotes a concrete structure such as a pillar or a pier which constitutes a civil engineering building structure such as a bridge or a building. Reference numeral 2 denotes a fiber-reinforced resin molded plate arranged along the peripheral surface of the structure 1 so as to increase the strength of the structure 1. The structure 1 and the molded plate 2 are made of epoxy, polyester, or vinyl ester. And are integrally bonded by a phenol-based resin adhesive 3.

As shown in FIG. 5, the fiber-reinforced resin molded plate 2 is formed by stacking, for example, three layers of a reinforcing fiber sheet 4 on which a resin 5 such as an epoxy resin, a polyester resin, a vinyl ester resin, or a phenol resin is applied. A plurality of rectangular plate-like portions 7 impregnated and solidified with an interval 6, and an interval 6 and both end portions 10 and 10 where the sheet 4 is separated without being impregnated with the resin 5;
When this is manufactured in a factory, for example, as shown in FIG. 6, a multilayer reinforcing fiber sheet 4 is placed on a flat mold base 8 and corresponds to the interval 6. The multilayer reinforcing fiber sheet 4 is pressed by a holding jig 9 having a width with a predetermined dimension of the plate-shaped portion 7, thereby preventing the resin from penetrating. The sheet 4 is impregnated with a resin, squeezed with a roller 13 to remove bubbles, and after the resin is cured, the holding jig 9 is removed. As shown in FIG. 7, one of the fiber reinforced sheets 4 has reinforcing fibers 4a having a higher tensile strength than concrete such as glass fiber, carbon fiber, and aromatic polyamide fiber arranged in one direction. Reinforcing fiber 4
In the direction intersecting with a, a suitable non-fraying synthetic fiber such as a vinyl ester fiber is blended and woven into a sheet, and if the purpose of reinforcing the structure 1 is shear reinforcement, the fiber reinforcement is used. When the sheet 4 is wound around the structure 1, the reinforcing fibers 4 a are arranged in the circumferential direction, and when buckling reinforcement is intended, the structure 1 is wound around the sheet 4.
The reinforcing fibers 4a are arranged in the length direction.

The width of the plate-like portion 7 is smaller than the assumed width of one circumferential surface, for example, 90% of the width, assuming that the structure 1 such as a concrete pillar to be reinforced has a rectangular cross section. And between the plate-like portions 7 is, for example, 1 of the assumed width.
An interval 6 of 0% size is formed. The number of the plate portions 7 is
In the case of reinforcing the concrete structure 1 having a rectangular cross section, the number of peripheral surfaces is minus one, and in the case of reinforcing a square pillar as shown in the figure, three are formed. The interval 6 gives the fiber-reinforced resin molded plate 2 flexibility, and the structure 1
Even if the width of the space 6 is larger or smaller than an assumed dimension by a certain range, the space 6 is bent so that the space 6 is located at the corner of the structure 1 and each plate is formed on each peripheral surface of the structure 1. The shape bodies 7 can be attached and adhered to each other, and can be adapted to reinforcement of the structure 1 having various dimensions.

When the fiber-reinforced resin molded plate 2 is adhered to the structure 1, the fiber-reinforced sheet 4 at the space 6 and at both ends 10, 10 is made of epoxy, polyester, vinyl ester, or the like. A resin adhesive such as a phenolic resin is impregnated, and the resin adhesive is applied to one surface of the plate-shaped portion 7 or the peripheral surface of the structure 1, and the molded plate 2 is rotated around the structure 1. Then, the both ends 10, 10 are superimposed on each other and adhered, and a fastening member 1 such as a column clamp is
1, and the resin adhesive was solidified and adhered. When a plurality of the fiber reinforced sheets 4 are stacked, as shown in FIG.
When the sheet is intertwined and adhered, each sheet 4 is annularly continuous around the structure 1, so that the structure 1 can be securely reinforced by shearing. When large reinforcement is required for the structure 1, the fiber-reinforced resin molded plate 2 is attached to the structure 1, and after the resin adhesive is solidified, the molded plate 2 is further placed thereon.
May be attached.

A finishing material 12 such as mortar or paint is applied to the outer peripheral surface of the molded plate 2 to ensure its weather resistance and heat resistance. It is advantageous that the finishing material 12 is applied and formed on the outer peripheral surface of the portion 7 so that the working time at the reinforcement work site can be shortened, and the space 6 and both end portions 10 are adhered to the structure 1. Later, the finishing material 12 is applied and formed. The resin impregnated in the plate-shaped portion 7 is a thermosetting resin, and the molded plate 2 is shipped from a factory in a state where the resin is uncured, and is adhered to the concrete structure 1 at a reinforcing work site. The shape 7 may be cured by heating.

FIG. 9 shows an embodiment in which a concrete beam 14 is reinforced. FIG. 10 shows an example in which a concrete box culvert 15 is reinforced.

[0014]

As described above, according to the present invention, a fiber-reinforced resin molded plate obtained by solidifying a multi-layered reinforcing fiber sheet for reinforcing a concrete structure with a resin is used. In addition to providing a non-impregnated portion that does not impregnate the resin at both ends and the interval of the sheet, the resin is bonded to the reinforcing fiber sheet at the interval and both ends when the molded plate is attached to the structure. A resin adhesive is applied to one surface of the plate-shaped portion and affixed to the peripheral surface of the structure while impregnating the agent,
Since the molded plate is pressed against the peripheral surface, it is possible to reinforce concrete structures of various dimensions with one type of reinforcing fiber resin molded plate and to apply the adhesive with an adhesive, so that the reinforcing work can be completed in a short time. In addition, there is an effect that the work is simple and inexpensive, and the molded plate can be manufactured relatively easily, which is advantageous for implementing the reinforcing method of the present invention.

[Brief description of the drawings]

FIG. 1 is a cutaway plan view of a conventional reinforcing device.

FIG. 2 is an enlarged view of a connecting portion in FIG. 1;

FIG. 3 is a sectional view of another conventional example.

FIG. 4 is a perspective view of a main part showing the embodiment of the present invention.

FIG. 5 is a perspective view of a fiber-reinforced resin molded plate of the present invention.

FIG. 6 is a cut-away side view showing a state in which a reinforcing fiber resin molded plate of the present invention is manufactured.

FIG. 7 is a perspective view of a main part of a reinforcing fiber sheet.

FIG. 8 is a sectional view of a main part according to the embodiment of the present invention.

FIG. 9 is a cut-away plan view showing a state where the present invention is applied to a concrete beam.

FIG. 10 is a cut-away plan view showing a state where the present invention is applied to a box culvert made of concrete.

[Explanation of symbols]

1 concrete column, 2 fiber reinforced resin molded plate, 3
Resin adhesive, 4 fiber reinforced sheet, 4a reinforcing fiber,
5 Resin, 6 intervals, 7 Plate, 10 Both ends, 11
Fastening members, 12 finishing materials,

Claims (3)

[Claims] 1. A fiber-reinforced resin molded plate obtained by solidifying and forming a multi-layered reinforcing fiber sheet with a resin is adhered to a peripheral surface of a concrete structure constituting a civil engineering building structure to reinforce the structure. In the reinforcing method, the fiber-reinforced resin molded plate is provided with a plate-like portion which is solidified with a resin at an intermediate portion of the reinforcing fiber sheet with an interval therebetween, and both ends of the sheet and the interval are impregnated with the resin. When the fiber-reinforced resin molded plate is adhered to the structure, a resin adhesive is impregnated in the reinforcing fiber sheets at the gaps and at both ends when affixing the fiber-reinforced resin molded plate to the structure. A method for reinforcing a concrete structure, comprising applying an adhesive, attaching the adhesive to the peripheral surface of the structure, and pressing the fiber-reinforced resin molded plate against the peripheral surface. 2. A fiber-reinforced resin molded plate which is formed by solidifying and molding a multilayer reinforcing fiber sheet which is adhered to a peripheral surface of a concrete structure constituting a civil engineering building structure to reinforce the structure. In the reinforcing device, at each end of the multi-layered reinforcing fiber sheet, separated ends are formed separately for each reinforcing fiber sheet, and a plate-shaped portion obtained by impregnating a resin in an intermediate portion of the reinforcing fiber sheet and solidifying is formed. An apparatus for reinforcing a concrete column, wherein the apparatus is formed with an interval not impregnated with a resin. 3. The concrete column according to claim 2, wherein a finishing material such as mortar, paint or the like is provided on a surface of the plate-shaped portion opposite to a surface to which the resin adhesive is applied. Body reinforcement device.