JP2002371795A - Repair structure of main structure and method of repair of main structure - Google Patents

Abstract

(57) [Problem] To provide a renovation structure of a main body structure and a method of renovating the main body structure which can be easily adjusted in strength and thickness and can be performed even in a place where conditions such as building limits are severe. SOLUTION: This is a repair structure of a main body structure in which a panel is attached to a surface of a main body structure 7, and a panel to be integrated with the main body structure has a multilayer structure in which a plurality of basic panels 1 are stacked. It is assumed that. Here, the bonding between the basic panels and between the main structure and the basic panels are preferably performed with an adhesive 2 such as epoxy resin or high-strength non-shrink mortar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering strength reduction due to deterioration of a main body structure constructed of concrete or the like, coping with an increased acting load due to a change in external force conditions, preventing the progress of deterioration, and improving the structure after repair. Prevention of surface roughness coefficient reduction, etc.
The present invention relates to a repair structure of a main structure used for repairing, reinforcing, and improving functions of the main structure, and a method of repairing the main structure.

[0002]

2. Description of the Related Art Concrete structures are made of various materials and materials.
Due to structural factors, aging occurs, cracks occur, corroding the internal reinforcing steel, cross-sectional defects, etc., lowering the structural strength, and changing the external force conditions and increasing the applied load It is necessary to make repairs and reinforcements as necessary. Conventionally, as a method of repairing an existing concrete structure (hereinafter, referred to as “existing concrete”), a method of installing a precast concrete plate, a method of installing a steel plate, a method of winding a carbon fiber or other chemical fiber sheet, and spraying a mortar A method and a method of applying a chemical material have been implemented.

[0003] These rehabilitation methods are performed on the outer peripheral surface or inner peripheral surface of a concrete structure. However, when a concrete structure is buried underground, renovation of the outer peripheral surface starts with removal of the surrounding earth and sand, structures, and the like, and therefore requires a great deal of cost and construction time. In addition, it is often impossible to expose the outer peripheral surface of a concrete structure constructed deep underground such as a subway or a common ditch. Therefore, it is preferable to repair the inner peripheral surface of the concrete structure.

[0004]

When the inner peripheral surface of a concrete structure is repaired, there are the following problems. <B> Many underground structures such as subways have strict construction limits, and renovation methods that significantly reduce the inner cross-sectional area cannot be adopted. Also, it is difficult to adopt a method of greatly increasing the weight of the main body structure. <B> In the subway, it is often difficult to stop the passage of trains. <C> In a concrete culvert or the like in which piping and power cables are arranged, a stand for supporting the piping and power cables is installed on the inner peripheral surface. In order to carry out the rehabilitation while these are in service, there are restrictions on the materials to be carried in and installed and the size of the installation machine.

Therefore, the description and problems of the above-mentioned conventional repair method will be described by taking as an example a case where the inner peripheral surface of a concrete structure is repaired.

<A> In the method of installing a precast concrete slab, after the deteriorated portion is improved, the precast concrete slab is arranged and temporarily fixed on the surface of the main structure, and is fixed by injecting an adhesive or mortar or the like. I do. However, in general, the width of the precast concrete slab is large, so that it is easily affected by architectural limitations, and it is difficult to install it in a narrow place. Further, since the weight is large, it is difficult to handle in a narrow place, and a heavy burden is imposed on the main body structure. Further, the corners are often chipped due to contact with other objects.

<B> In the method of installing a steel plate or the like, after repairing the deteriorated portion, a steel plate, a stainless steel plate, a copper plate, or the like is attached to the main body structure. The attachment is performed with a bolt, an adhesive or the like. However, since concrete and steel plate have different physical properties, it is difficult to integrate them. Therefore, water often accumulates between the concrete and the steel plate with the passage of time, and corrosion often occurs. Also, in the work in the tunnel, considerable ventilation is required for welding, and the equipment cost increases.

<C> In the method of winding a chemical fiber sheet of carbon fiber or the like, after the deteriorated portion is repaired, the chemical fiber sheet is directly attached to the main structure using an adhesive such as epoxy (referred to as a direct bonding method). In this method, there is a problem that the epoxy impregnation depends on the on-site temperature and the skill of the operator. Further, it cannot be used for a main body structure in a place where it cannot be made conductive.

<4> Generally, the mortar is sprayed directly on the main body structure after repairing the deteriorated portion. However, quality control of spraying is difficult, and construction management for details is difficult. Therefore, it is not suitable for subtle renovation.

<E> The method of applying a chemical material is performed by hand coating or spraying after repairing a deteriorated portion. This method is mainly for waterproofing, repairing the main body structure,
It does not reinforce.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems. It is an object of the present invention to provide a body structure which can be easily adjusted in strength and thickness and can be used even in places where conditions such as building limits are severe. It is an object of the present invention to provide a repair method for a repair structure and a main structure. It is another object of the present invention to provide a repair structure of a main body structure and a method of repairing the main body structure which are excellent in workability and can be installed even in a narrow place. It is still another object of the present invention to provide a repair structure for a main body structure and a method for repairing a main body structure that can be easily divided even in a short time.
In the present invention, not only repair and reinforcement, but also renovation to add water resistance and fire resistance of the main structure, and in hydraulic structures, maintain or increase the flow rate (lower roughness coefficient, lower cross section of flow product) It is an object of the present invention to provide a repair structure of a main body structure and a method of repairing the main body structure that improve the function of the structure, such as repair for the purpose of reducing the amount). The present invention achieves at least one of these objects.

[0012]

Means for Solving the Problems In order to achieve the above object, a modified structure of a main structure of the present invention is a modified structure of a main structure in which a panel is attached to a surface of the main structure. Further, the panel integrated with the main structure has a multilayer structure in which a plurality of basic panels are stacked. Here, the joining between the basic panels and between the main body structure and the basic panels are preferably performed with an adhesive such as epoxy resin or high-strength non-shrink mortar.

In the above invention, at least a part of the basic panel may be a modified panel comprising a polyolefin-based reinforcing fiber, a cement, and an organic fiber. Here, the surface of the polyolefin-based reinforcing fiber is preferably formed in an uneven shape. Further, it is preferable to perform a hydrophilic treatment to increase the interfacial adhesion to the cement matrix.

Further, in the above invention, at least a part of the basic panel can be a composite panel including a reinforcing layer, a reinforcing plate, and an adhesive. That is, the number, arrangement position, and the like of the repair panel and the composite panel can be arbitrarily determined according to the required strength or the allowable thickness.

In the above invention, a cement-based bonding material may be interposed between the basic panels.

Further, in the method for repairing a main body structure according to the present invention, the first basic panel is attached to the surface of the main body structure, and the second and subsequent basic panels are attached to the already installed basic panel with an adhesive. This is a method of attaching a desired number of basic panels.

In the above-mentioned method for repairing a main body structure, it is preferable that the basic panels are overlapped so that the connecting portion of the lower basic panel and the connecting portion of the upper basic panel are not at the same position.

Further, according to the method for repairing a main body structure of the present invention, a first basic panel is attached to the surface of the main body structure, and a second basic panel is arranged at a distance from the basic panel. This is a method of filling a cement-based bonding material between the first basic panel and the second basic panel. here,
If a high-strength composite panel is arranged on the first basic panel, it plays a role of a reinforced concrete structure together with the joining material and the second basic panel.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

<B> Basic Panel The basic panel 1 is a panel which is an element of the renovation structure 10 having a multilayer structure. The renovation structure 10 of the main body structure of the present invention includes:
The basic panel 1 is constructed by overlapping. As the basic panel 1, a repair panel 11 and a composite panel described later can be used.

<B> Refurbished Panel The refurbished panel 11 is a panel formed by mixing polyolefin-based reinforcing fibers, cement, and organic fibers. Here, pulp or the like is used as the organic fiber. The repair panel 11 is a product having a thickness of about 3 mm to 15 mm, and is extremely thin and light as compared with a normal precast concrete slab. Therefore, the size per panel can be increased, and the workability is enhanced. Further, it can be easily installed by inserting it into a narrow gap or the like. Further, forming such as bending can be easily performed.

The polyolefin-based reinforcing fiber is a fiber material made of a polyolefin-based material such as polypropylene, polyethylene and polybutene. Among these, a polyolefin-based reinforcing fiber using polypropylene as a raw material is particularly suitable for the present invention. The polyolefin-based reinforcing fiber is formed into a length of, for example, about 6 to 30 mm and used as a short fiber. In addition, the surface of the polyolefin-based reinforcing fiber is subjected to a special embossing process so as to be uneven. As a result, detachment from the cement hardly occurs, and the flexural toughness (toughness) of the repair panel 11 is improved. Further, the surface shape of the polyolefin-based reinforcing fiber is subjected to a hydrophilic treatment to increase the interfacial adhesion to the cement matrix. Since the surface of polypropylene is hydrophobic so that the surface is not compatible with water when untreated, the strength and toughness of the modified panel 11 can be improved by performing a hydrophilic treatment.

The polyolefin-based reinforcing fiber has a tensile strength of 400 to 480 (N / mm ² ), and can improve the strength characteristics and various physical properties of the modified panel 11.

Polyolefin-based reinforcing fibers made of polypropylene are excellent in alkali resistance, do not rust, and do not generate nitrogen, sulfur, or chlorine-based harmful gases during combustion. Furthermore, since the specific gravity is as light as 0.91, the repair panel 11 can be reduced in weight.

<C> Composite Panel The composite panel 12 includes a reinforcing plate 121, a reinforcing layer 122, and an adhesive. If necessary, the composite panel 12 may be formed by sandwiching the reinforcing layer 4 between two reinforcing plates 121 (FIG. 3).
reference).

The reinforcing plate 121 is a plate material used to protect the reinforcing layer 122 and increase the rigidity of the composite panel 12. In some cases, only one reinforcing plate 121 is used. As the reinforcing plate 121, a flexible board, the above-mentioned modified panel 11, fiber reinforced plastic (FRP), fiber reinforced concrete, high-strength concrete, or the like can be used.

The flexible board contains cement and organic fibers (pulp) as main components, is kneaded, then formed into a roll, and dewatered and pressed. For this high-strength flexible board, a well-known product can be used.
m standard product. The flexible board can be easily manufactured in a factory, the product quality is stable, the bending strength is as large as 30 (N / mm ² ) or more, the surface does not crack, and the durability is nonflammable. There are advantages from the point of view. Furthermore, it can be easily bent and formed into a desired shape according to the shape of the main body structure 7 to be reinforced, and the specific gravity is as light as 1.6 to 1.8, so that the workability and transportability can be improved. There are also advantages in terms of workability, such as ease of installation.

The two reinforcing plates 121 used for the composite panel 12 may be made of different materials.

The reinforcing layer 122 is a sheet-like or plate-like material arranged to increase the strength of the composite panel 12.
For the reinforcing layer 122, for example, a carbon fiber sheet, an aramid fiber sheet, a polyethylene fiber sheet, a polypropylene fiber sheet, a glass fiber sheet, a vinylon fiber sheet, or the like can be used. Here, as the various fiber sheets, known single-oriented sheets, single-oriented sheets alternately laminated like plywood, cloth-like sheets, and the like can be used. When various fiber sheets are used as the reinforcing layer 122, it is necessary to use a material or weaving method that at least allows the adhesive to penetrate in order to impregnate the adhesive. Here, impregnation means
This refers to infiltration of a liquid substance (adhesive) into voids for modifying a porous body (fiber sheet). Even if the impregnation of the adhesive is performed before the composite panel 12 is manufactured,
It may be performed during manufacturing.

The carbon fiber sheet has a specific gravity of 1.7 to 1.7.
1.8 and light weight, not to rust,
In the fiber direction, 5000 to 6 times that of the rebar is about 5 to 6 times.
000 (N / mm ² ). Therefore, by arranging the carbon fiber sheet between the reinforcing plates 121 having high strength, it is possible to obtain a structural strength equal to or higher than that of reinforced concrete with a thin film.

<D> Adhesive The adhesive 2 is a material interposed between the basic panel 1 and the main structure 7 and between the basic panels 1 to integrate them.
Any kind of material may be used as long as it can be integrated, but from the viewpoint of adhesive strength and workability, epoxy resin and high-strength non-shrink mortar are preferable. The other adhesives 2 include resin adhesives such as EVA (ethylene-vinyl acetate copolymer resin), polymer resin, vinyl acetate resin, silicone, and acrylic resin, chloroprene rubber, It is also possible to use a rubber-based adhesive such as a styrene / butadiene rubber-based adhesive, or a water / air-hardened adhesive such as a cement-based or gypsum-based adhesive.

<E> Bonding Material The bonding material 21 is a material that is interposed between the basic panels 1 to integrate them. It is preferable to use a cement-based solidifying material having rigidity after hardening in order to fill the bonding material 21 into a portion requiring a certain thickness compared to the adhesive 2 described above. For example, high-strength non-shrink mortar, high-strength concrete, fiber-reinforced concrete, and the like can be used.

Hereinafter, a method for repairing a main body structure according to the present invention will be described with reference to the drawings.

<A> Application Conditions (See FIG. 1) The main body structure according to the present invention is used in the main body structure 7 already used, such as a subway, an electric cave, a pipe cave, and a culvert in a factory. The renovation method of the goods will be implemented. These main structures 7 often have construction limitations and have cables, pipes 91 or their pedestals 92 and other facilities which are difficult to relocate, so that large materials cannot be carried in and installed in many cases. . The effect of the present invention is remarkably exhibited in renovation work in such a narrow and poor working environment. It is preferable to construct the renovation structure 10 rationally in accordance with the position where a moment or a shear force is generated in the main body structure 7. That is, the repaired structure 10 of the present invention does not necessarily need to be performed on the entire surface of the main body structure 7 and can be constructed at intervals as long as it can resist external force. In addition, it can be installed in a location where the function of the main body structure 7 is less affected.

<B> Attaching Basic Panel First, the deteriorated portion of the main body structure 7 is removed as necessary, and the first basic panel 1 is attached to the surface of the main body structure 7. Since one basic panel 1 is lightweight and thin, it is easy to handle and can be arranged by inserting the basic panel 1 into a narrow gap. The attachment of the basic panel 1 to the main body structure 7 is performed by the adhesive 2. Adhesive 2
It may be filled between the basic panel 1 and the main body structure 7 or may be applied to the main body structure 7 and the basic panel 1 in advance. A projection such as a dowel may be attached to the surface of the basic panel 1 on the side of the main body structure 7 as needed to increase the adhesive force.

Then, the second and subsequent basic panels 1 are attached with the adhesive 2 so as to overlap the already installed basic panel 1. Thus, the repair structure 10 having a multilayer structure is completed. The reinforcing bolt 6 can be used together with the adhesive 2 or alone. Reinforcement bolt 6 is renovation structure 1
0 is penetrated and fixed to the main body structure 7 (see FIG. 1).

<C> Installation Pattern of Basic Panel FIGS. 1 and 2 show the composite panel 1 on the surface of the main body structure 7.
2 was attached, followed by attaching six modified panels 11, and finally attaching a composite panel 12 to show a modified structure 10 constructed. Here, since the basic panel 1 is a thin plate, even if this number of sheets are piled up, it is only about 70 mm. The type of the basic panel 1, the number of panels to be installed, and a combination thereof can be arbitrarily selected according to the strength of the main body structure 7 required after the repair. For example, when a large reinforcement is required, the entire basic panel 1 is replaced with the composite panel 12, and when the purpose is to repair or prevent corrosion, the repair panel 1 is used.
The refurbished structure 10 can also be constituted by only one.

<D> Use in connection part (see FIG. 4) In the present invention, connection parts 51 and 52 are formed at the end of the panel for mounting a plurality of basic panels 1 on the surface of the main body structure 7. Depending on the quality of the construction of the connecting parts 51 and 52,
Since the effect of installing the basic panel 1 changes greatly, it is necessary to construct the connecting portions 51 and 52 so as not to be a weak point. For example, the basic panel 1 is overlapped so that the connecting portion 52 of the lower basic panel 1 (renovated panel 11) and the connecting portion 51 of the upper basic panel 1 (composite panel 12) are not at the same position.

<E> When a bonding material is used (see FIG. 5) A bonding material 21 can be filled between the basic panels 1. For example, the composite panel 12 having a high strength is
The modified panel 11 is installed at a predetermined distance from the composite panel 12. And
The bonding material 21 is filled between the composite panel 12 and the repair panel 11 to integrate them. With such a structure,
Since the high-strength composite panel 12 plays a role of a reinforcing bar, and the bonding material 21 and the repair panel 11 arranged outside play a role of covering the reinforcing bar, the thickness is smaller than that of the reinforced concrete and is equal to or higher than that of the reinforced concrete. Can be obtained. Furthermore, if the method of filling the bonding material 21 later is adopted, the surface of the repaired structure 10 can be easily arranged at an accurate position, and the thickness of the repaired structure 10 can be freely adjusted. In addition, the modified panel 11 described above is replaced with the composite panel 12.
Or both can be freely selected as the renovation panel 11.

[0040]

The structure for repairing the main body structure and the method for repairing the main body structure according to the present invention are as described above, and the following effects can be obtained. <B> This is a multilayer structure in which a plurality of basic panels are stacked and constructed. Therefore, the thickness and strength of the repaired structure can be freely adjusted according to the purpose or condition of the repair. <B> The thickness of one of the basic panels making up the renovation structure is thin and light. For this reason, it is easy to handle even in a narrow place, and it can be installed by inserting the basic panel into a narrow place that cannot be normally repaired. <C> Since the minimum unit of work can be divided into the work of pasting one basic panel, work can be performed between train operations. <D> A repair structure can be constructed by selecting a portion of the main structure that requires repair. Therefore, the strength and thickness of the repaired structure can be changed according to the generated sectional force. Also,
The renovation structure can be constructed intensively in a place where the function of the main body structure is not affected or where it is easy to install. <E> A bonding material can be filled between the composite panel and the refurbished panel to integrate them. In this case, the surface of the repaired structure can be easily arranged at an accurate position, and the thickness of the repaired structure can be freely adjusted. Further, a reinforcing effect equal to or higher than that of reinforced concrete can be obtained with a thickness smaller than that of repairing with reinforced concrete. <F> The surface of the basic panel of the present invention is smooth and has a small roughness coefficient. In addition, the basic panel is thin. For this reason,
It can be used for rehabilitation of hydraulic structures. In addition, since the water permeability is small, the water resistance of the structure is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a repair structure of a main body structure according to the present invention.

FIG. 2 is an enlarged sectional view of an embodiment of the renovation structure.

FIG. 3 is a perspective view of an embodiment of the composite panel.

FIG. 4 is a sectional view of an embodiment of a method for repairing a main body structure.

FIG. 5 is a sectional view of an embodiment of a repair structure for a main body structure using a bonding material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Basic panel 10 ... Refurbished structure 11 ... Refurbished panel 12 ... Composite panel 121 / Reinforcement plate 122 / Reinforcement layer 2 ... Adhesive 21 ... Joining material 51 ... Connection part 52 ... Connection part 7 Body structure

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Yamazaki 2-16-9, Kabukicho, Shinjuku-ku, Tokyo Inside Shi Bill Renewal Co., Ltd. (72) Inventor Akira Ikenoya 2-169-9, Kabukicho, Shinjuku-ku, Tokyo No. Shibuya Renewal Co., Ltd. (72) Motoo Eguchi 2-16-9 Kabukicho, Shinjuku-ku, Tokyo, Japan Innovator Shibuya Renewal Co., Ltd. No. 9 Civil Renewal Co., Ltd. F-term (reference) 2D055 AA01 AA05 KA02 LA16 2E176 AA01 BB29

Claims (7)

[Claims] A modified structure of a main body structure in which a panel is attached to a surface of the main body structure, wherein a panel integrated with the main body structure has a multilayer structure in which a plurality of basic panels are stacked. The renovation structure of the main structure. 2. The modified structure of the main body structure according to claim 1, wherein at least a part of the basic panel is a modified panel made of a polyolefin-based reinforcing fiber, a cement, and an organic fiber. Renovation structure of structure. 3. The repair structure for a main body structure according to claim 1, wherein at least a part of the basic panel is a composite panel including a reinforcing layer, a reinforcing plate, and an adhesive. Renovation structure of main structure. 4. A repair structure for a main body structure according to claim 1, wherein a cement-based bonding material is interposed between said basic panels. Construction. 5. A first basic panel is attached to the surface of the main body structure, and the second and subsequent basic panels are attached to the already installed basic panel with an adhesive, and a desired number of basic panels are attached. How to repair the main structure. 6. A method for repairing a main body structure according to claim 5, wherein the basic panels are overlapped so that the connection of the lower basic panel and the connection of the upper basic panel are not at the same position. How to repair the main structure. 7. A first basic panel is attached to a surface of a main body structure, a second basic panel is arranged at a distance from the basic panel, and a first basic panel and a second basic panel are arranged. A method of repairing the main structure by filling a cement-based bonding material between the panels.