JP3801753B2 - Method and material for reinforcing concrete columnar body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for reinforcing concrete columnar bodies such as concrete columns and piers provided close to a wall surface, and a reinforcing material used for the reinforcement.
[0002]
[Prior art]
Conventionally, as a seismic reinforcement method for concrete columnar bodies such as railway and road piers, building columns and beams, an iron plate winding method, a concrete winding method, an FRP winding method using aromatic polyamide fiber, etc. are known. ing.
[0003]
[Problems to be solved by the invention]
When a railway or road viaduct is used effectively as a tenant building, etc., the walls of the building are often close to the pier, and the pier in such an environment can be used with a steel plate winding method or a concrete winding method. Seismic reinforcement requires a large space for construction around the pier and is generally done by temporarily removing the walls. However, removing the wall cannot be easily done because it temporarily interrupts business activities such as a tenant building and causes a compensation problem.
[0004]
On the other hand, the FRP winding method, in which FRP tape is wrapped around or pasted on concrete pillars such as bridge piers and then impregnated and cured with resin, can be applied even in a relatively narrow work space without the construction material being bulky. A working space width of about 50 to 60 cm, which allows workers to enter during the impregnation work or the like, is a minimum requirement. For example, when the gap c between the pier a and the wall b as shown in FIG. 1 is 10 cm and the width of the pier is 2 m, the FRP winding method cannot be constructed.
[0005]
An object of this invention is to provide the reinforcement method which can reinforce a concrete columnar body in a very narrow work space, and the reinforcing material used for this.
[0006]
[Means for Solving the Problems]
In the present invention, a belt-shaped reinforcing material made of reinforcing fibers such as aromatic polyamide fibers is wound around a concrete columnar body such as a bridge pier provided close to the wall surface, and the concrete is impregnated with resin between the reinforcing fibers. In the method of reinforcing the columnar body, a cured portion impregnated and cured in advance is formed in the middle portion in the length direction of the belt-shaped reinforcing material, and an adhesive is applied to one side of the cured portion. The reinforcing material is turned so that the hardened portion is located on the side surface on the wall surface side of the concrete columnar body, the hardened portion is adhered to the side surface, and a portion other than the hardened portion of the reinforcing material is impregnated with resin. The above object was achieved by sticking to the columnar body and curing the resin. A reinforcing layer in which the fiber direction of the reinforcing fiber is arranged in the axial direction of the concrete columnar body and hardened by impregnation with a resin at the cured portion of the belt-shaped reinforcing material, and is substantially the same width as the width of the belt-shaped reinforcing material A reinforcing layer having a width larger than that of the belt-shaped reinforcing material is integrally provided, and a plurality of belt-shaped reinforcing materials having the reinforcing layer are formed on the side surface of the concrete columnar body on the wall surface side. By aligning the fiber direction and adhering sequentially without any gaps, by adhering a connecting reinforcing material having a reinforcing layer having the same width as the width of the belt-like reinforcing material in the gap between the reinforcing layers of each reinforcing material, The concrete columnar body approaching the wall can be bent and reinforced, and the entire surface of the reinforcing material or the reinforcing layer can be brought into close contact with the side surface by an air bag provided between the wall surface and the hardened portion or the reinforcing layer. The reinforcing material having the structure according to claim 4 or later can be advantageously used for such a reinforcing method.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described with reference to the drawings. In FIG. 2, reference numeral 1 denotes a pier or beam having a width of 2 m provided with a gap 3 of about 10 cm, for example, so that an operator cannot enter the wall surface 2. 4 shows a belt-shaped reinforcing material wound around the concrete columnar body 1 for seismic reinforcement.
[0008]
The details of the belt-like reinforcing material 4 are as shown in FIG. 3, and the fiber direction A of the reinforcing fiber having high tensile strength such as aromatic polyamide fiber and carbon fiber is arranged in the length direction and knitted into a belt shape. This is wound around the columnar body 1 and then impregnated with epoxy resin, polyester resin, vinyl ester resin, phenolic resin, polyimide resin or the like, and cured and fixed integrally with the columnar body 1. The The belt-shaped reinforcing material 4 is attached so as to cover the entire periphery of the columnar body 1. The intermediate portion 4a in the length direction of the belt-shaped reinforcing material 4 is formed with a cured portion 5 that is impregnated with a resin having a length corresponding to the width of the columnar body 1 and cured in a factory or the like. When winding around the columnar body 1, for example, an adhesive similar to the resin impregnated therein is applied to the cured portion 5, and the cured portion 5 is turned to the side surface 1 a facing the wall surface 2 of the columnar body 1. The hardened portion 5 is temporarily fixed to the side surface 1a by taking a reaction force from the wall surface 2 or pulling both end portions of the belt-shaped reinforcing material 4. Then, the other part of the belt-shaped reinforcing material 4 is impregnated with the resin such as the epoxy resin and adhered to the side surface of the columnar body 1, and both end portions thereof are overlapped with an appropriate width at an appropriate position. To wear. This sticking work is performed without gaps over the entire circumference of the columnar body 1 and the hardening work for hardening the impregnated resin is performed to complete the work of shear reinforcement and toughness reinforcement. It is easy to follow the side surface 1a, and it is only necessary to adhere the pre-formed cured portion 5 to the side surface 1a facing the gap 3, so that the resin impregnation curing work can be performed in a narrow gap where the worker cannot enter without removing the wall surface 2. , Compensation for tenants, etc. and cost of wall reconstruction can be omitted. The belt-like reinforcing material 4 may be wound around the columnar body 1 in multiple layers as necessary.
[0009]
When the columnar body 1 requires bending reinforcement, as shown in FIGS. 4 and 5, a belt-shaped reinforcing material for bending reinforcement having a configuration in which a reinforcing layer 6 is bonded to the cured portion 5 of the belt-shaped reinforcing material 4. 7 and a connecting belt-shaped reinforcing material 7a, the reinforcing layer 6 is knitted by arranging the fiber direction B of the reinforcing fibers in the axial direction of the columnar body 1, that is, the width direction of the belt-shaped reinforcing material 4, and the whole It is impregnated with resin and cured to form a plate. The thickness (number of layers), the length, and the width of the reinforcing layer 6 are arbitrary, but the length of the reinforcing layer 6 is approximately the same as the width of the columnar body 1 as shown in FIG. The width was set such that four of the four reinforcing members 4 could be bonded side by side and the seam 6a remained on one or both sides in the width direction. The connecting belt-shaped reinforcing material 7a shown in FIG. 5 is formed by forming the reinforcing layer 6 wider than the joint allowance 6a, preferably the same width as the belt-shaped reinforcing material 4, and is used as described later. The The type of resin impregnated in the reinforcing layer 6 is preferably the epoxy resin used for forming the cured portion 5.
[0010]
The belt-like reinforcing material 7 for bending reinforcement is obtained by applying an adhesive to the surface of the plate-like reinforcing layer 6 and reinforcing the reinforcing layer into the gap 3 between the columnar body 1 and the wall surface 2 as shown in FIGS. 6, the both ends of the belt-like reinforcing member 4 are pulled or the reaction force is taken from the wall surface 2 to bond and fix the reinforcing layer 6 to the side surface 1 a of the columnar body 1, as shown in FIG. A plurality of belt-shaped reinforcing members 7 for bending reinforcement are wound around the entire side surface 1a of the columnar body 1 with no gap as much as possible in the vertical direction, and the non-impregnated portion of the belt-shaped reinforcing material 4 is impregnated with the epoxy resin. Adhering to the peripheral surface of the columnar body 1, the resin is cured and integrated with the columnar body 1. In this state, the reinforcing fibers of the upper and lower belt-like reinforcing members 7 and 7 for bending reinforcement are not continuous, but the connecting reinforcing member 7a is formed in the recess 8 formed by each joint 6a as shown in FIG. As a result, the reinforcing layer 6 is bonded onto the upper and lower joints 6a, 6a, and the reinforcing fibers of the reinforcing members 7 are connected to the columnar body 1 through the reinforcing layer 6 of the reinforcing member 7a. When it becomes a continuous state in the axial direction and a bending force acts on the columnar body 1, the reinforcing fibers continuous in the longitudinal direction resist the bending force and reinforce the columnar body 1. The fixing method of the connecting reinforcing material 7a is the same as that of the reinforcing materials 4 and 7, and an adhesive is applied to the cured reinforcing layer 6 of the connecting bending reinforcing material 7a and the both ends thereof are pulled. After adhering to the recess 8 and impregnating the resin with both ends thereof, the resin is adhered to the peripheral surface of the columnar body 1 and cured to be in a fixed state. In this case, the reinforcing members 6 of the belt-like reinforcing member 7 for bending reinforcement are bonded with the belt-like reinforcing members 4 and 4 as shown in FIG. The side surface 1a becomes flat, the appearance is improved, and the strength is improved.
[0011]
The hardened portion 5, the reinforcing layer 6, or the belt-like reinforcing material 7 a for bending reinforcement is strengthened by being fixed in close contact with the side surface 1 a, but the reinforcing strength is increased. 9, after attaching the hardened portion 5 etc., as shown in FIG. 9, an inflatable airbag 9 is interposed in the gap 3, and this is inflated to attach the hardened portion 5 etc. to the side surface 1 a or the reinforcing layer 6. The adhesive and the impregnated resin were cured while pressing with an equal force while maintaining a tightly adhered state, and after the curing, the airbag 9 was reduced and removed.
[0012]
The size of the hardened portion 5 is preferably formed so as not to exceed the size of the concrete column 1, particularly the width of the column 1, whereby the reinforcing members 4 and 7 and the belt-like reinforcement for connection are formed. When sticking the material 7a, the sticking can be performed without causing a space by following the shape of the corner portion of the columnar body 1, and the reinforcing strength is improved.
[0013]
In the above description, the reinforcement to the side surface 1a of the concrete columnar body 1 to which the present invention is applied has been described. However, the bending reinforcement to the other side surface that is wide enough to allow an operator to enter the wall is conventional. Reinforcing work is performed by means such as sticking a reinforcing material impregnated with resin in a sheet shape in which reinforcing fibers are arranged in the longitudinal direction.
[0014]
【The invention's effect】
As described above, according to the present invention, a hardened portion in which a resin is impregnated and hardened in advance is formed in the intermediate portion in the length direction of a belt-like reinforcing material that reinforces a concrete columnar body such as a pier provided close to a wall surface. Then, after applying an adhesive to one side of the cured part, the reinforcing material is turned so that the cured part is located on the side surface of the concrete columnar body, and the cured part is adhered to the side surface, Since the resin other than the cured portion of the reinforcing material is impregnated with resin and adhered to the columnar body to cure the resin, the columnar body approaching the wall surface can be reinforced without dismantling the wall surface, Costs for compensation to tenants, etc. and rebuilding of the wall surface do not occur, and there is an effect that the construction cost of the reinforcement work is economical and inexpensive, and the columnar body is provided in the middle part in the longitudinal direction of the belt-shaped reinforcing material. Place the fiber direction of the reinforcing fiber in the axial direction and impregnate the resin to cure By using a reinforcing layer that is integrally provided with a reinforcing layer having a width substantially equal to the width of the belt-shaped reinforcing material or a larger width than the belt-shaped reinforcing material, the reinforcing layer is close to the wall surface. The effect of bending and reinforcing the side surfaces of the columnar body without disassembling the wall surface is obtained. Reinforcement strength can be achieved by attaching a reinforcing material by interposing an air bag in the gap with the wall surface. The method of the present invention can be appropriately carried out with the reinforcing material having the constitution of claim 4 or less.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a concrete columnar body approaching a wall surface. FIG. 2 is a plan view of an embodiment of the present invention. FIG. 3 is a perspective view of a belt-like reinforcing material used in the practice of the present invention. FIG. 5 is a perspective view of a connection reinforcing material used in the practice of the present invention. FIG. 6 is an explanatory diagram of a process for carrying out the method of the present invention. FIG. 7 is a process explanatory view of the method of the present invention. FIG. 8 is a longitudinal sectional view of a belt-like reinforcing material for bending reinforcement used in the practice of the present invention. FIG. 9 is a plan view of another embodiment of the present invention. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concrete columnar body, 1a Side surface, 2 Wall surface, 3 Crevice, 4 Belt-shaped reinforcement, 5 Hardened part, 6 Reinforcement layer, 6a Seam, 7 Bend reinforcement for bending reinforcement, 7a Belt-shaped reinforcement for connection , 9 Airbag,

Claims (6)

A belt-shaped reinforcement made of reinforcing fibers such as aromatic polyamide fibers is wound around a concrete pillar such as a bridge pier provided close to the wall surface, and the concrete pillar is reinforced by impregnating resin between the reinforcing fibers. In this method, a cured portion in which a resin is impregnated and cured in advance is formed in an intermediate portion in the length direction of the belt-shaped reinforcing material, and an adhesive is applied to one side of the cured portion, and then the reinforcing material is Turn the hardened part so that it is located on the side of the wall surface side of the concrete columnar body, stick the hardened part to the side, and impregnate the part other than the hardened part of the reinforcing material with resin. A method for reinforcing a concrete columnar body, comprising sticking and curing the resin. A reinforcing layer in which the fiber direction of the reinforcing fiber is arranged in the axial direction of the concrete columnar body and hardened by impregnation with a resin at the cured portion of the belt-shaped reinforcing material, and is substantially the same width as the width of the belt-shaped reinforcing material A reinforcing layer having a width larger than that of the belt-shaped reinforcing material is integrally provided, and a plurality of belt-shaped reinforcing materials having the reinforcing layer are formed on the side surface of the concrete columnar body on the wall surface side. It is characterized by sticking a reinforcing material for connection having a reinforcing layer having the same width as the width of the belt-like reinforcing material in the gap between the reinforcing layers of each reinforcing material after sequentially sticking without gaps with the fiber direction aligned. The method for reinforcing a concrete columnar body according to claim 1. The adhesive and the impregnating resin are cured while inflating an airbag interposed between the hardened portion or the reinforcing layer and pressing against the side surface of the concrete columnar body. The method for reinforcing a concrete columnar body according to claim 1, wherein the concrete columnar body is removed. A belt-like reinforcing material comprising reinforcing fibers such as aromatic polyamide fibers that are wound around a concrete columnar body such as a bridge pier provided close to the wall surface to reinforce it, and the fibers of the reinforcing fiber of the belt-like reinforcing material A reinforcing material for a concrete columnar body, characterized in that a direction is arranged in a circumferential direction of the concrete columnar body, and a cured portion is formed by impregnating a resin in advance in an intermediate portion in the longitudinal direction of the belt-shaped reinforcing material and curing the resin. . A belt-like reinforcing material comprising reinforcing fibers such as aromatic polyamide fibers that are wound around a concrete columnar body such as a bridge pier provided close to the wall surface to reinforce it, and the fibers of the reinforcing fiber of the belt-like reinforcing material A reinforcing layer of reinforcing fibers disposed in the axial direction of the concrete columnar body is provided in the middle part of the longitudinal direction of the belt-shaped reinforcing member, the direction being arranged in the circumferential direction of the concrete columnar body, and the intermediate part and the reinforcing layer A reinforcing material for a concrete columnar body, wherein a cured portion is formed by impregnating a resin in advance and curing. The reinforcing material for a concrete columnar body according to claim 5, wherein the width of the reinforcing layer is the same as or larger than the width of the belt-shaped reinforcing material.

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