JP2006057236A - Reinforcing composite panel for concrete structure, and reinforcing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing composite panel for a concrete structure, stable in quality and lightweight with excellent workability, and to provide a reinforcing method. <P>SOLUTION: The reinforcing composite panel 1 comprises an incombustible or flame resistant panel 10 and a fibrous reinforcing sheet 20 bonded to one face of the panel 10. The reinforcing sheet 20 has a joint margin 21 projected by a fixed width from the outer periphery of the panel 10. The reinforcing composite panel 1 is fixed to the surface of the concrete structure to be reinforced, in the facing state of the surface of the reinforcing sheet 20, and an auxiliary panel 30 for closing a joint part 7 formed at joint margin portions positioned between the adjacent panels 1, is stuck to the joint part 7. Further, an injection agent is injected in a clearance among the concrete structure, the reinforcing composite panel and a joint member and solidified. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite panel for reinforcing various concrete structures such as a tunnel, a bridge, a bridge pier, a box culvert, a tank, and a slab of a building, and a reinforcing method.

  In concrete structures such as tunnels, when cracks in concrete due to deterioration over time, corrosion of built-in reinforcing bars, etc. progress, the proof stress of the structure decreases, and accidents such as peeling of lining concrete may occur. Therefore, in order to reinforce the concrete structure, the following method is adopted.

(1) Steel plate bonding method: The steel plate manufactured and processed at the factory is brought into the field, and this is fixed to the concrete surface with anchor bolts, etc., and the gap between the concrete and the steel plate is filled with mortar etc. and integrated. Method.
(2) Carbon fiber sheet construction method: A method of applying a protective resin to the surface of a concrete surface after adhering the carbon fiber sheet using an impregnating adhesive after the surface treatment.
(3) Method described in Patent Document 1: A cement mortar composite plate incorporating a carbon fiber sheet is fixed to the surface of a concrete structure to be reinforced with a small gap, and the composite plate and the concrete structure are fixed. A method of injecting mortar into the gap for integration.

JP 2000-220304 A

The above prior art has the following disadvantages.
(1) According to the steel plate bonding method, since the steel plate is heavy, heavy equipment is required for construction, and a lot of time is required for construction preparation and withdrawal. Moreover, as a protective measure, rust-proof coating must be applied to the surface every 3 to 5 years, which is troublesome.
(2) According to the carbon fiber sheet construction method, the construction is likely to vary depending on the skill level of the worker, pinholes and wrinkles are generated, the sheet may be peeled off, and the quality is not stable. In addition, since the carbon fiber conducts electricity, energization occurs when the sheet is peeled off if the adhesion is insufficient.
(3) According to the method described in Patent Document 1, the quality is stable. However, although the adjacent composite plates are joined at the built-in carbon fiber sheet portion, the carbon fiber sheet itself is not directly fixed to the concrete structure, and is attached to the concrete structure via the cement mortar substrate on the inner surface. Since it is a fixed aspect, as a result, it is difficult to obtain sufficient strength of the joint portion of the panel. Further, since the composite plate has a sandwich structure in which cement mortar layers are formed on both sides of the carbon fiber sheet, the weight is heavy and workability is poor.

  The present invention has been made in consideration of the disadvantages of the prior art described above, and provides a composite panel for reinforcing a concrete structure and a reinforcing method, which are stable in quality, lightweight and excellent in workability. Objective.

[Invention of Claim 1]
A concrete structure comprising a non-flammable or flame retardant panel and a fibrous reinforcing sheet bonded to one surface of the panel, the reinforcing sheet having a joining margin that protrudes from the outer periphery of the panel by a certain width. This is a composite panel for reinforcing objects.
[Invention of Claim 2]
In the reinforcing composite panel, the non-combustible or flame-retardant panel is a fiber-reinforced cement-based panel, and the reinforcing sheet is made of carbon fiber, glass fiber, or aramid fiber.
[Invention of Claim 3]
Fixing the reinforcing composite panel according to claim 1 or 2 with the reinforcing sheet surface facing the surface of a concrete structure to be reinforced;
A step of attaching a bonding member that closes the bonding portion to a bonding portion formed in a bonding margin portion located between adjacent panels;
A method for reinforcing a concrete structure comprising: a concrete structure and a step of injecting and solidifying an injecting agent into a gap between the reinforcing composite panel and the joining member.
[Invention of Claim 4]
The reinforcing composite panel according to claim 1 or 2 is fixed so that the reinforcing sheet surface faces the surface of the concrete structure to be reinforced and the joining margins of adjacent panels are overlapped, A step of impregnating and bonding the overlapped joint margin portion with an adhesive and solidifying the impregnated portion;
A method for reinforcing a concrete structure, comprising a step of injecting an injecting agent into a gap between the concrete structure and the reinforcing composite panel to solidify.
[Invention of Claim 5]
A method of handling a composite panel for reinforcing concrete structures according to claim 1 or 2, wherein the panel has a planar shape that matches a joint margin of the composite panel for reinforcing according to claim 1 or 2, and A frame member having a thickness corresponding to a thickness is combined with the reinforcing composite panel in accordance with a joining margin portion of the reinforcing sheet, and a protective sheet covering the reinforcing sheet surface is interposed, so that the reinforcing composite panel is The method of transferring a composite panel for reinforcing concrete structures according to claim 1 or 2, wherein a plurality of sheets are stacked and transferred.

[Invention of Claim 1]
Since the reinforcing composite panel according to claim 1 is produced in a factory, the quality is stable. Easy to manufacture and low cost. Since the surface panel is nonflammable or flame retardant, it has excellent fire resistance. Since it has a two-layer structure in which a fibrous reinforcing sheet is bonded to one surface of the panel, it is lightweight, easy to transport and transport, easy to work, and excellent in workability.
Since the fibrous reinforcing sheet is directly bonded to the surface of the concrete structure without inclusions, the panel can be strongly bonded to the panel with sufficient strength at the panel joint, and the fiber strength Can be effectively exerted to provide a reinforcing effect.

[Invention of Claim 2]
The non-combustible panel is a fiber reinforced cement panel, and the reinforcing sheet is made of carbon fiber, glass fiber, or aramid fiber, so that it is easy to manufacture and can be used after being cut to an appropriate size on site. Is possible.

[Invention of Claim 3]
According to the method for reinforcing a concrete structure according to claim 3, the work is simple and the workability is excellent. The treatment of the joint is simple and sufficient strength of the joint can be obtained. The construction quality is stable and the finish is beautiful.
[Invention of Claim 4]
According to the method for reinforcing a concrete structure according to claim 4, the work is simple and the workability is excellent. Since the joining portion of the adjacent panels includes a step in which the joining margin portion of the reinforcing sheets superimposed is impregnated and bonded with an adhesive and the impregnated portion is solidified, the fibrous reinforcing sheets are reliably integrated with each other, Excellent strength.

[Invention of Claim 5]
According to the method for transferring a composite panel for reinforcing a concrete structure according to claim 5, it is possible to maintain and transfer the composite panel without damaging the reinforcing composite panel.

  Embodiments according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and additions are possible within the scope of the gist of the present invention. Note that the same reference numerals are used for the same elements in the drawings, and description thereof may be omitted as appropriate.

1A and 1B show a reinforcing composite panel 1 according to a first embodiment, where FIG. 1A is a plan view, FIG. 1B is a cross-sectional view taken along line bb in FIG. 1A, and FIG. It is sectional drawing. FIG. 2 is a perspective view showing a modification of the reinforcing composite panel 1 of FIG.
The reinforcing composite panel 1 has a two-layer structure of a nonflammable panel 10 and a fibrous reinforcing sheet 20 bonded to one surface of the panel 10 with an appropriate adhesive.

The panel 10 is made of a noncombustible or flame retardant material, preferably a fiber reinforced cement material. For example, a fiber reinforced cement-based panel having a thickness of 3 to 5 mm, a specific gravity of 1.6 to 1.9, and a bending strength of 33 N / mm ² or more is preferably used.
Although the magnitude | size of the panel 10 is not limited, For example, the rectangular thing about 2000 mm x 1000 mm is easy to use. In addition to the flat plate shape, it can be a curved surface shape that is appropriately R-processed according to the surface shape of the concrete structure.

The fibrous reinforcing sheet 20 is made of a fibrous material such as aramid fiber or other synthetic fiber, glass fiber, or carbon fiber. A carbon fiber excellent in tensile strength is preferred. For example, a continuous carbon fiber sheet having a basis weight of 200 to 300 g / m ² , a tensile strength of 3500 N / mm ² or more and a thickness of 0.1 to 0.2 mm is preferably used. Either unidirectional fiber or cloth bi-directional fiber may be used. The total thickness of the reinforcing composite panel 1 composed of the fiber reinforced cement panel 10 and the carbon fiber reinforcing sheet 20 is preferably 3 to 7 mm.

The fibrous reinforcing sheet 20 is larger than the planar shape of the panel 10 in both length and width, and is bonded to the panel 10 so as to have a joining margin 21 that protrudes from the outer periphery of the panel 10 by a certain width. Therefore, the part of the joining allowance 21 is comprised only by the fibrous reinforcement sheet 20 to which the adhesive agent is not apply | coated. For this reason, when the bonding member 30 described later is attached to the bonding allowance 21 portion with an adhesive, it can be made surely and strongly. The width of the joining allowance 21 is usually about 100 mm, but is not limited. When the reinforcing composite panels 1 are fixed side by side on the concrete structure to be reinforced, adjacent reinforcing composite panels 1 are overlapped with each other or joined at the edge of the joining allowance 21. To.
In addition, the joining allowance 21 is not limited to what was provided in the perimeter of the outer periphery of the panel 10. FIG. As shown in FIG. 2, according to the attachment site to the concrete structure or the like, a composite panel for reinforcement is provided by providing a joining margin 21 only on a part of the outer periphery of the panel (for example, two opposite sides of the rectangular panel 10). 1 can also be configured.

  In the central portion of the reinforcing composite panel 1, a through-hole 3 is formed for injecting an injection agent such as epoxy resin after the panel 1 is fixed to the concrete structure during construction. The injection holes 3 may be provided at a plurality of locations depending on the size of the panel. Further, in the outer peripheral portion of the reinforcing composite panel 1, through holes 5 for inserting anchor bolts for fixing the reinforcing composite panel 1 to the concrete structure are formed at a plurality of locations. However, the fixing composite panel 1 can be fixed to the concrete structure by using other appropriate fixing means without depending on the anchor bolt, and the insertion hole 5 is not necessarily required.

A method for reinforcing a concrete structure using the composite panel for reinforcement 1 will be described.
First, as a pretreatment, an anchor bolt for fixing the reinforcing composite panel 1 is attached to the concrete structure to be reinforced as appropriate. These pretreatments can use various known methods.
Next, an anchor bolt is passed through the insertion hole 5 of the reinforcing composite panel 1 so that a slight gap is formed between the reinforcing composite panel 1 and the surface of the concrete structure. Fix the surface facing the surface of the concrete structure. The gap between the reinforcing composite panel 1 and the concrete structure is usually about 1 to 5 mm. This gap can be formed without using a jig or the like.
The reinforcing composite panel 1 may be fixed to the anchor bolt alone. However, in order not to damage the fibrous reinforcing sheet 20, the frame member 40 may be used as described later in view of work efficiency and the like. It is desirable that the frame member 40 be removed after fixing with being fitted.
Subsequently, the reinforcing composite panels 1 are sequentially arranged and fixed. At this time, the adjacent composite panels 1 for reinforcement are made to overlap with each other at the joining margins 21 as shown in FIG.

  After the fixing of the reinforcing composite panel 1 with the anchor bolt is completed, as shown in FIG. 3, a joint portion (covered with the panel 10) formed at the joint portion 21 between adjacent reinforcing composite panels 1 and 1 is used. The joining member 30 that closes the joint 7 is attached to the non-part 7) by pasting using an adhesive or the like. This joining member 30 is normally comprised by the 2 layer structure similar to the composite panel 1 for reinforcement. However, the one having no protruding portion such as the joining allowance 21 is used. FIG. 3 is an explanatory view of attachment of the joining member 30 and shows a state in which a plurality of reinforcing composite panels 1 are fixed to the structure, but the injection hole 3 and the insertion hole 5 are not shown. is doing.

After the attachment of the joining member 30 is completed, it is formed between the concrete structure and the reinforcing composite panel 1 and the joining member 30 (fibrous reinforcing sheet 20) from the injection hole 3 of the reinforcing composite panel 1. An injection is injected into the gap, and the injection is filled into the gap and solidified. Thereby, a series of processes are completed, and the concrete structure is integrated and reinforced through the reinforcing composite panel 1 and the joining member 30 and the fibrous reinforcing sheet 20. The injecting agent to be injected is preferably an epoxy resin. The epoxy resin, specific gravity 1.2 ± 0.1, compressive strength 70N / m ² or more, the flexural strength 50 N / m ² or more is preferable. In addition, when the surface of the concrete structure is inferior due to junkers, unevenness, steps, cracks, cross-sectional defects, etc., it is possible to improve the strength of the structure by injecting cement-based high-flow non-shrinking injection. is there.

A concrete structure reinforcement method (Example 3) using the composite panel for reinforcement 1 slightly different from the reinforcement method of Example 2 will be described with reference to FIGS. 4 and 5 are cross-sectional views in the vicinity of the joining allowance between adjacent reinforcing composite panels 1.
In the reinforcing method according to the third embodiment, the necessary pretreatment is performed as in the second embodiment, and then the reinforcing sheet 20 of the reinforcing composite panel 1 is opposed to the surface of the concrete structure G, thereby reinforcing the reinforcing composite. When the panels 1 are fixed side by side, as shown in FIG. 4, adjacent reinforcing composite panels 1 are fixed so that the joining margins 21 of the reinforcing sheets 20 are overlapped with each other, and the overlapping joining margins are fixed. The 21 parts are impregnated with an adhesive, and the overlapped parts are bonded to each other (reference C). As the adhesive, any adhesive suitable for adhering the reinforcing sheets 20 may be used, but those similar to the above-mentioned injection, for example, epoxy resin-based adhesives are preferably used. The reinforcing composite panel 1 is fixed to the concrete structure G using anchor bolts or the like as in the second embodiment (not shown in the same manner as in FIG. 3). 4 shows a state in which a plurality of reinforcing composite panels 1 are fixed to the structure G, as in FIG. 3, but the injection hole 3 and the insertion hole 5 are not shown. Impregnation of the overlapped joint allowance 21 is performed by application, spraying, or the like.
Then, the adhesive-impregnated portion of the overlapped joint allowance 21 is solidified. By the impregnation bonding and solidification by the adhesive between the bonding margins 21, the adjacent fibrous reinforcing sheets 20 are continuously and reliably integrated.

Next, after the fixing of the reinforcing composite panel 1 and the impregnation adhesion and solidification of the joining margins 21 are completed, as shown in FIG. 4, the overlapping joining margin 21 portion between the adjacent reinforcing composite panels 1, 1. The joining member 30 that closes the joining portion 7 is attached to the joining portion 7 that is formed in the above-described manner using an appropriate means such as sticking using an adhesive or screwing. The joining member 30 is not a two-layer structure provided with the same reinforcing sheet as the reinforcing composite panel 1 unlike the one described in the second embodiment, and is not a single panel (for example, the same as the panel 10 as described above). Incombustible or incombustible material, preferably fiber-reinforced cement-based material).
After the attachment of the joining member 30 is completed, the concrete structure G, the reinforcing composite panel 1 and the joining member 30 (fibrous reinforcing sheet 20) are injected from the injection hole 3 of the reinforcing composite panel 1 in the same manner as in Example 2. An injecting agent is appropriately injected into the gap formed between the two, and the injecting agent is filled in the gap and solidified. As a result, a series of steps is completed, and the concrete structure G is integrated and reinforced by the reinforcing composite panel 1 and the joining member 30 through the fibrous reinforcing sheet 20.

In addition, about the attachment to the junction part 7 of the said joining member 30, the injection agent by which the fibrous reinforcement sheets 20 are integrated and inject | poured by the impregnation adhesion | attachment by the adhesive agent of the joining margins 21 of the reinforcement sheet 20, and solidification If it is in a state where it does not leach from the inside of the joint allowance 21 to the surface side at the joint 7, it is carried out after the step of injecting and solidifying the filler into the gap between the concrete structure G and the reinforcing composite panel 1. Also good.
Further, as a modification of the third embodiment, a method that does not use the joining member 30 may be employed. That is, instead of the joining member 30, the joining portion 7 formed in the joining allowance 21 portion is filled with a caulking material, putty or other appropriate filler 35 as shown in FIG. You may make it protect.

A method for transferring the reinforcing composite panel 1 will be described. 6A and 6B show the composite panel 1 for reinforcement when transported. FIG. 6A is a longitudinal sectional view of a single composite panel 1 for reinforcement, and FIGS. 6B and 6C are stacked composite panels 1 for reinforcement. FIG. 7 is a perspective view of the frame member 40.
As shown in FIG. 7, the frame member 40 has a rectangular cross section, is formed in a planar shape that matches the joining allowance 21 portion of the reinforcing composite panel 1, and fits into the reinforcing composite panel 1. ing. The thickness is equivalent to the thickness of the panel 10.
By fitting the reinforcing composite panel 1 on the frame member 40 from above, the frame member 40 is combined with the reinforcing composite panel 1 in accordance with the joining margin 21 portion of the reinforcing sheet 20. Then, a protective sheet 45 that covers the reinforcing sheet 20 is placed on the surface of the reinforcing sheet 20. In this way, a plurality of the composite panels 1 for reinforcement are stacked and transferred with the protective sheet 45 covering the surface of the reinforcing sheet 20 interposed therebetween (see FIG. 6B). Further, as shown in FIG. 6C, one of the pair of reinforcing composite panels 1 and 1 is turned upside down and combined so that the reinforcing sheet 20 faces each other with the protective sheet 45 interposed therebetween. A plurality of sets may be stacked and transferred.
The protective sheet 45 is preferably a sheet or film made of paper or synthetic resin and having weak adhesiveness.

The composite panel 1 for reinforcement which concerns on Example 1 is shown, (a) is a top view, (b) is bb sectional drawing of (a), (c) is cc sectional drawing of (a). is there. 6 is a perspective view showing a modification of the reinforcing composite panel 1 of Embodiment 1. FIG. It is explanatory drawing of attachment (Example 2) of the joining member 30. FIG. It is explanatory drawing of the reinforcement method which concerns on Example 3. FIG. It is explanatory drawing of the reinforcement method which concerns on Example 3. FIG. The composite panel 1 for reinforcement at the time of transfer is shown, (a) is a longitudinal sectional view of a single composite panel for reinforcement 1, and (b) and (c) are longitudinal sections in a state where the composite panels for reinforcement 1 are stacked. FIG. 4 is a perspective view of a frame member 40. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite panel for reinforcement 3 Injection hole 5 Insertion hole 7 Joining part 10 Panel 20 Fibrous reinforcement sheet 21 Joining allowance 30 Joining member 40 Frame member 45 Protection sheet G Concrete structure

Claims (5)

  A concrete structure comprising a non-flammable or flame retardant panel and a fibrous reinforcing sheet bonded to one surface of the panel, the reinforcing sheet having a joining margin that protrudes from the outer periphery of the panel by a certain width. Composite panel for reinforcing objects.   2. The composite panel for reinforcing a concrete structure according to claim 1, wherein the non-combustible or flame-retardant panel is a fiber-reinforced cement-based panel, and the reinforcing sheet is made of carbon fiber, glass fiber, or aramid fiber. Fixing the reinforcing composite panel according to claim 1 or 2 with the reinforcing sheet surface facing the surface of a concrete structure to be reinforced;
A step of attaching a bonding member that closes the bonding portion to a bonding portion formed in a bonding margin portion located between adjacent panels;
A method for reinforcing a concrete structure, comprising: a concrete structure; and a step of injecting and solidifying an injection agent into a gap between the reinforcing composite panel and the joining member. The reinforcing composite panel according to claim 1 or 2 is fixed so that the reinforcing sheet surface faces the surface of the concrete structure to be reinforced and the joining margins of adjacent panels are overlapped with each other. A step of impregnating and bonding the overlapped joint margin portion with an adhesive and solidifying the impregnated portion;
A method for reinforcing a concrete structure, comprising a step of injecting an injecting agent into a gap between the concrete structure and the reinforcing composite panel to solidify.   A frame member having a planar shape that matches the joining margin portion of the reinforcing composite panel according to claim 1 and having a thickness corresponding to the thickness of the panel is adapted to the joining margin portion of the reinforcing sheet. The composite panel for reinforcing concrete structures according to claim 1 or 2, wherein the composite panel is combined with a reinforcing composite panel, and a plurality of the reinforcing composite panels are stacked and transported with a protective sheet covering the reinforcing sheet surface interposed therebetween. Transport method.

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