JP2001262841A - Reinforcing method for concrete structure, reinforced panel, and reinforced panel fixing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing method for a concrete structure, a reinforcing panel used therefor and a reinforced panel fixing tool capable of assuring the completion of the work in a short time, safely and at a low cost and the easy maintenance. SOLUTION: A backing treatment is performed for a concrete surface as a target of repairing. Anchor bolts 6 are driven to the concrete surface. When the backing is defective, epoxy primer 2 is coated to the surface to be worked and, if required, cracks are filled. From the top of this, epoxy putty 3 for adhesion is coated from the top of the filling. While the epoxy putty 3 is unhardened state, a reinforcing panel 4 is attached and tightened with an anchor bolt 6, and crimped and fixed to a concrete structure 1. The reinforcing panel 4 is made by forming many hollow portions extending in the panel thickness direction between many girder-shaped members of predetermined height arranged to a mesh shape in the panel in-plane direction, and the panel functions as a high-strength, high-rigidity panel while being lightweight and, after the work, the repaired surface is visually inspected directly from the hollow portion and the progress of deterioration, cracking can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a concrete structure using a reinforcing panel, the reinforcing panel,
It is used for repairing and reinforcing mainly existing concrete structures, which also serves to prevent the degraded portions from peeling off, and is also applicable to new concrete structures.

[0002]

2. Description of the Related Art Concrete structures are deteriorated due to improper blending during concrete placement, concrete neutralization, chloride ion penetration, freeze-thaw action, chemical erosion, alkali-aggregate reaction, cold joints, etc. Deterioration is a problem, and if cracks occur in the concrete or there is a risk of concrete falling off,
Repair and reinforcement are required.

Conventionally, as a measure to prevent the existing concrete from deteriorating, the mortar or resin is applied after a ground treatment such as injecting a caulking material into the cracked portion or removing the degraded portion. The way to be done.

Further, the repaired surface may be covered with sheets to prevent the existing concrete from falling off due to surface peeling. In addition, as a reinforcement method that also serves to prevent the degraded portion of an existing concrete structure from peeling off, a method of attaching a steel plate to a deteriorated surface of concrete or a method of lining with concrete is generally adopted.

[0005]

The above-mentioned repair method is,
Only the surface protection by the surface treatment is achieved, and the effect of reinforcing the deteriorated structure can hardly be expected.

[0006] In addition, although the attachment of sheets is effective in preventing a small amount of lightweight small lumps from dropping and preventing tensile stress, when the sheets are adhered to the existing concrete surface with an adhesive, it is difficult to cure the adhesive. It takes time, and during that time, the work and method of crimping are troublesome, and the sheet is damaged in the case of a large lump or a large amount of peeling, and there is a problem that it is not effective for pulling, shearing or bending . There is also a problem that the sheet is peeled off due to the osmotic pressure of water.

Further, a lining in which a steel plate having a thickness that can be expected to have a reinforcing effect is fixed to a lining surface with an anchor bolt has a heavy weight of the steel plate, has a problem in working efficiency and safety, and has a complicated lining surface. However, it is not an easy task to cut a thick steel plate according to its shape.

[0008] In this case, the elongation rate due to the temperature is different due to the difference in the material of the concrete and the steel material, and the steel plate is bent or cracked, and a load is applied to the anchor bolt. Danger of falling off and peeling of the lining material,
A problem arises in the reliability of fixing the lining material.

[0009] The lining with cast-in-place concrete is a large-scale construction including driving of anchors, arranging reinforcing bars, assembling of formwork, placing of concrete, and removing of formwork. In short, the construction cost is large.

[0010] In addition, in the lining by these, it is expected to reinforce the existing concrete and prevent the exfoliation, but the interface between the existing concrete and the lining material cannot be visually observed, and the generation of new cracks and the progress of deterioration can be prevented. Since it is not possible to know the weight, maintenance is limited only to the surface of the lining material, and there is a problem that deterioration has already occurred and a part where crack generation or deterioration progress is most concerned cannot be managed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned background, and is used for a method of reinforcing a concrete structure that can be completed safely and inexpensively in a short period of time and can be easily maintained and managed. It is an object to provide a reinforcing panel and a reinforcing panel fixture.

[0012]

According to a first aspect of the present invention, there is provided a method for reinforcing a concrete structure, comprising: a plurality of girder portions having a predetermined height arranged in a mesh shape in a panel surface direction; A reinforcing panel having a plurality of extending hollow portions is attached to a surface of a concrete structure requiring reinforcement so that a reinforcing surface can be seen through the hollow portions.

The reinforcing panel is basically a panel that is attached to a repair surface or a reinforcing surface of concrete as a panel. The reinforcing panel is a lightweight, high-strength, high-rigidity, and shear-resistant panel that can be easily handled by an operator. 50 to 2 in width
Approximately 00cm (rectangular, other shapes are not particularly limited)
Are preferred.

The reinforcing panel used in the present invention is formed by forming a number of hollow portions extending in the thickness direction of the panel between a number of girder portions of a predetermined height arranged in a mesh in the in-plane direction. Therefore, the girder has the same function as the girder of the structure,
The hollow part reduces the weight while increasing the rigidity of the panel.

Further, since the repaired surface or the reinforcing surface can be seen through the hollow portion, even if the concrete body portion may be cracked or peeled off due to deterioration after repair or reinforcement, the situation is directly visually observed. can do.

From the above, it is considered that the size of the mesh of the reinforcing panel is usually preferably about 2 to 10 cm. However, the size and the shape of the mesh are adjusted according to the size of the lump to prevent peeling. You may change it.

The method of reinforcing a concrete structure according to the present invention is mainly used for repair and reinforcement of an existing concrete structure such as a tonen lining or a bridge in order to prevent a deteriorated portion from peeling off. The present invention can be applied to a concrete structure, and the type and use of the structure are not particularly limited.

According to a second aspect of the present invention, in the method for reinforcing a concrete structure according to the first aspect, a case where the reinforcing panel is attached after performing a base treatment or a surface treatment on a reinforcing surface is limited.

Here, the base repair or the surface repair includes a base treatment using a sander or the like, a crack repair, a resin primer application, a resin undercoat, and the like, and can be selectively performed depending on the situation. In the case where a crack has occurred, the crack can be filled with mortar or the like as necessary, but when the progress of the crack is controlled in a state where it can be visually observed through the hollow portion of the reinforcing panel without filling. There is also.

A concrete reinforcing panel according to a third aspect is a reinforcing panel applicable to the concrete structure reinforcing method according to the first and second aspects, and has a predetermined height arranged in a mesh shape in an in-plane direction of the panel. A large number of hollow portions extending in the panel thickness direction are formed between the large number of girder portions.

The mesh shape is a general lattice shape,
There is no particular limitation on hexagonal or other polygons, those having holes of circular or elliptical shape, and the girder portions of about 2 to 10 cm (which are not limited to each) constituting the mesh are in the in-plane direction of the panel. In addition to transmitting the stress in the form of an axial force, the rigidity of the entire panel can be increased by the cross-sectional rigidity of the girder portion.

The material is not particularly limited to metal, synthetic resin, and the like as long as the strength required for the reinforcing panel can be obtained. Claims 4 and 5 limit the case where the concrete reinforcing panel according to claim 3 is formed of a lightweight metal and the case where the concrete reinforced panel is formed of a fiber reinforced plastic, respectively.

In claim 3, as described above, the material of the reinforcing panel is not particularly limited. However, particularly suitable materials are a lightweight metal such as an aluminum alloy, which can be expected to be relatively lightweight and high in strength, and glass fiber. Reinforced fiber reinforced plastic (FRP) and the like.

In the case of fiber reinforced plastics, it is also possible to easily cut and process them appropriately on site by using a cutter or the like. The reinforcing panel fixing device according to claim 6, wherein a plurality of hollow portions extending in the panel thickness direction are formed between a number of girder portions having a predetermined height arranged in a mesh shape in the panel surface direction. A fixing tool for fixing a reinforcing panel to a reinforcing surface of a concrete structure, a fixing portion fitted into a hollow portion of the reinforcing panel and fixed to the surface of the concrete structure, and rising from the fixing portion, And a locking portion locked to the girder portion of the reinforcing panel.

According to the first and second aspects of the present invention, the method of mounting the reinforcing panel includes a method of directly fixing with an adhesive, a method of mounting using a metal tool that is driven into the repair surface or the reinforcing surface, a method of using these together, and the like. Although not particularly limited, since the reinforcing panel has a mesh shape having a hollow portion, the invention according to claim 6 is an invention as a fixture which can easily and reliably fix the reinforcing panel using the hollow portion. It was done.

In this case, for example, in a state where the reinforcing panel is pressed against the repair surface or the reinforcing surface, the fixing portion of the panel fixing tool is inserted into the hollow portion of the panel, and at the same time, the locking portion is engaged with the girder portion of the reinforcing panel. The reinforcement panel can be fixed by fixing the fixing portion to the concrete structure with an anchor bolt or the like.

[0027]

1 and 2 show an embodiment in which the reinforcing method of the present invention is applied to repair of a tunnel lining, and FIG. 3 shows a reinforcing panel used in the method. FIG. 4 shows an example of a secondary lining panel used as needed.

In the drawing, reference numeral 1 is a concrete structure, 2 is an epoxy primer, 3 is an epoxy putty, 4 is a reinforcing panel, 5 is a holding plate, 6 is an anchor bolt for fixing a reinforcing panel, and 6 'is a secondary lining panel. Anchor bolts for fixing,
Reference numeral 7 denotes a secondary lining panel.

The reinforcing panel 4 can be formed by using an aluminum alloy, a fiber reinforced plastic, or the like as a material. In this example, a girder-shaped portion having a height corresponding to the panel thickness is combined in a hexagonal shape, and a large number of holes having a honeycomb cross-section are formed. Thus, a lightweight, high-strength, high-rigidity reinforcing panel 4 is obtained. I have. The diameter of this hole is 2-10c
m, and the repair surface or the reinforcing surface can be seen through the hole.

In the molding, the entire reinforcing panel 4 can be integrally molded. In the case of fiber reinforced plastic, cutting and processing can be easily performed even at the site by using a cutter or the like.

The secondary lining panel 7 is used as necessary for the purpose of completely preventing water from flowing or peeling off the degraded portion, and is made of an aluminum alloy, Alternatively, a fiber reinforced plastic or the like is suitable.

The work procedure in the above embodiment will be described below with reference to FIG. (1) First Step The degraded layer on the concrete surface is polished, removed, etc. by sander keren with a sander 11, high pressure washing, shot blasting or the like.

(2) Second Step Anchor bolts 6 and 6 'for attaching the reinforcing panel 4 and the like are driven into the repair surface.

(3) Third Step In the case where the base is poor, the epoxy primer 2 is applied to the construction surface with a roller brush 12 or the like. If necessary, cracks are filled.

(4) Fourth Step After the epoxy primer 2 is dried, an epoxy putty 3 for adhesion is applied with a roller brush 12 or the like, and pressed with a rubber spatula 13.

(5) Fifth Step The reinforcing panel 4 is attached with the epoxy putty 3 in an uncured state. In this example, the holding plate 5 is passed to the inner side of the tunnel of the reinforcing panel 4, tightened with the anchor bolt 6 prepared in the second step, and crimped to the concrete structure 1.
It is fixed.

(6) Sixth Step If necessary, a secondary lining panel 7 is installed so as to cover the reinforcing panel 4, and the secondary lining panel 7 is crimped to the concrete structure 1 by anchor bolts 6 '. And fix it.
At this time, a packing 8 made of softened rubber or the like is sandwiched between the concrete structure 1 and the secondary lining panel 7 to ensure watertightness.

The secondary lining panel 7 is effective in terms of water separation and concrete peeling and dropping on the repair surface, but it is a hindrance to constantly monitor the progress and deterioration of cracks. Install according to the situation. Further, even when the secondary lining panel 7 is attached, the repair surface can be managed if it can be removed at the anchor bolt 6 '.

FIG. 5 shows another embodiment of the reinforcing panel of the present invention, in which the girder portions 4a crossing each other at right angles.
Thus, the space between the girder portions 4a is a hollow portion 4b as a through hole.

As a material, an aluminum alloy or a fiber-reinforced plastic is suitable. A lightweight, high-strength, high-rigidity reinforcing panel 4 is used. However, it can be easily cut and processed in the same manner as the reinforcing panel described with reference to FIGS. 1 to 4, but because of the lattice shape, molding is easy,
There is an advantage that strength can be easily secured.

FIG. 6A shows an embodiment in which the reinforcing panel 4 of FIG. 5 is applied to repair or reinforcement of a concrete structure, and FIG. 6B shows a reinforcing panel fixing tool 9a used at that time.
It is shown.

The fixing member 9a is provided in the hollow portion 4b of the reinforcing panel 4.
A fixing portion 21 fitted into the inside and fixed to the surface of the concrete structure 1 by the anchor bolts 6 and the like; a locking portion 22 rising from the fixing portion 21 and locked to the girder portion 4a of the reinforcing panel 4; Consists of

As shown in FIG. 6 (a), the fixing device 9a is easily attached by being fitted into the hollow portion 4b from the surface side of the reinforcing panel 4 along the surface of the concrete structure 1. Can be fastened to the anchor bolt 6 with a nut or the like and integrated with the surface of the concrete structure 1.

FIG. 7 shows an embodiment in which the reinforcing method according to the present invention is applied to a portion extending from a lower surface of a bridge girder to an outer surface of a girder of a bridge as a concrete structure 1, and FIG. A cross section in the direction perpendicular to the bridge axis, (b) is a reinforcing panel fixing tool 9b for fixing the outer peripheral portion of the reinforcing panel 4
It is shown.

The reinforcing panel 4 shown in FIG. 4 can be used. Further, the fixing of the reinforcing panel 4 can be performed using a fixing tool of an arbitrary shape in addition to the fixing tool 9b on the outer peripheral portion. For example, on the lower side of FIG.
A plate-shaped fixture 9c extending between the girder portions of the reinforcing panel 4 is used, and is fixed with the anchor bolt 6 via the fixture 9c.

[0046]

In the method for reinforcing a concrete structure according to the present invention, a reinforcing panel is provided between a number of girders having a predetermined height arranged in a mesh in an in-plane direction and a plurality of hollows extending in the thickness direction of the panel. Since the girder portion is formed, the girder portion has the same function as the girder of the structure. The rigidity of the panel can be increased, and the weight can be reduced by the hollow portion.

Further, since the repaired surface or the reinforcing surface can be seen through the hollow portion of the panel, even if the concrete body portion may be cracked or peeled off due to deterioration after repairing or reinforcing, the situation may be reduced. It can be directly observed, and measures can be taken at an early stage.

When the concrete reinforcing panel of the present invention is applied to a method for reinforcing a concrete structure,
In addition to having the above effects, lightweight metal and fiber reinforced plastic reinforcement panels can be expected to be lightweight and have high strength, and in the case of fiber reinforced plastics, they can be easily cut and processed on site by using a cutter or the like as appropriate. Is also possible and handling is easy.

Further, by processing the reinforcing panel, it is possible to cope with a complicated shape, and the panel becomes a high-strength panel against tension, shearing, and bending. Through
By integrally and firmly adhering to the concrete surface, the existing concrete structure can be effectively reinforced.

Further, since the reinforcing panel can be fixed to the concrete surface with anchor bolts or the like, there is no need to wait for the adhesive resin or the like applied to the concrete surface to harden, and the installation is completed in a short time. The time required for construction can be reduced.

Even if the surface of the concrete structure is peeled off, a lump larger than the mesh of the reinforcing panel is prevented from falling by the mesh of the reinforcing panel, and a lump smaller than the mesh of the reinforcing panel is adhered to the concrete surface. By applying a resin or the like, the resin is prevented by a film-like resin layer formed continuously over the entire surface of the reinforcing surface, thereby preventing falling.

Further, when cracks and progress of deterioration are visually recognized through the mesh of the reinforcing panel, the reinforcing panel can be removed and the surface of the existing concrete can be treated again. It is possible to replace with a stronger panel with higher strength and thickness of the girder part, or to maintain it by filling the hollow opening of the panel with mortar or resin, thereby preventing disaster occurrence before it occurs can do.

If the size of the reinforcing panel is about 50 cm to 2 m square, the difference in the amount of expansion and contraction between the panel and the concrete material is small, and the anchor bolt does not fall off the concrete and the reinforcing panel does not come off.

The reinforcing panel fixing device of the present invention is such that the reinforcing panel is attached to the surface of a concrete structure requiring repair or reinforcement by utilizing the shape of the hollow portion and the girder portion. In addition, the installation work of the reinforcing panel becomes easy, and the construction cost can be reduced.

As described above, according to the present invention, safety measures, reinforcement, and maintenance of concrete structures can be performed safely, reliably, quickly, and at low cost without any need for special techniques. Management becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a case where the reinforcing method of the present invention is applied to repair of tunnel lining.

FIG. 2 is a sectional view corresponding to the embodiment of FIG.

3 shows an example of a form of a reinforcing panel used in the embodiment of FIG. 1, (a) is a cross-sectional view, and (b) is a plan view.

4 shows an example of a form of a secondary lining panel used in the embodiment of FIG. 1, wherein (a) is a sectional view and (b) is a plan view.

FIG. 5 is a perspective view showing another embodiment of the reinforcing panel of the present invention.

6A is a sectional view showing an embodiment in which the reinforcing panel of FIG. 5 is applied to repair or reinforcement of a concrete structure, and FIG. 6B is a perspective view of a reinforcing panel fixture.

FIG. 7 is a perspective view showing an embodiment in a case where the reinforcing method of the present invention is applied from a lower surface of a bridge girder to an outer surface of a girder.

8A is a cross-sectional view in the direction perpendicular to the bridge axis corresponding to the embodiment of FIG. 7, and FIG. 8B is a perspective view showing a reinforcing panel fixing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Concrete structure, 2 ... Primer, 3 ... Epoxy putty, 4 ... Reinforced panel, 4a ... Girder part, 4b ... Hollow part, 5 ... Holding plate, 6 ... Anchor bolt, 6 '... Anchor bolt, 7 ... Secondary Lining panel, 8 ... packing, 9a ...
Reinforcement panel fixture, 9b: Reinforcement panel fixture, 9c: Reinforcement panel fixture, 11: Sander, 12: Roller brush, 13: Rubber spatula, 21: Fixing part, 22: Locking part

Claims (6)

[Claims] 1. A reinforcing panel having a large number of hollow portions extending in a panel thickness direction formed between a number of girder portions having a predetermined height arranged in a mesh shape in the panel surface direction needs to be reinforced. A method for reinforcing a concrete structure, wherein the reinforcing surface is attached to the surface of the concrete structure so as to be able to be seen through the hollow portion. 2. The method for reinforcing a concrete structure according to claim 1, wherein the reinforcing panel is attached after a ground surface treatment or a surface treatment of a reinforcing surface is performed. 3. A concrete reinforcement characterized in that a number of hollow portions extending in the thickness direction of the panel are formed between a number of girder portions of a predetermined height arranged in a mesh shape in the panel surface direction. panel. 4. The concrete reinforced panel according to claim 3, wherein a lightweight metal is formed. 5. The concrete reinforced panel according to claim 3, wherein a fiber reinforced plastic is molded. 6. A concrete reinforcing panel formed by forming a large number of hollow portions extending in the panel thickness direction between a plurality of girder portions having a predetermined height arranged in a mesh shape in the panel surface direction.
A fixing device for fixing to a reinforcing surface of a concrete structure, comprising: a fixing portion fitted into a hollow portion of the reinforcing panel and fixed to a surface of the concrete structure; And a locking portion locked to the shape portion.