JP5623936B2 - REINFORCEMENT MATERIAL, STRUCTURE REINFORCEMENT STRUCTURE AND STRUCTURE REINFORCING METHOD - Google Patents

Description

  The present invention relates to a reinforcing material, a reinforcing structure for a structure, and a reinforcing method for a structure, and more particularly to a reinforcing material using basalt fiber as a raw material, a reinforcing structure for a structure, and a reinforcing method for a structure.

  Generally, the inner surface of a structure, for example, a tunnel, is covered with concrete (covering concrete), and the covering itself has deteriorated due to changes in soil pressure and spring water over time or due to long-term use. Repair and reinforcement will be necessary.

  In addition, cavities on the backside of the lining due to construction methods and the like are also factors of tunnel lining.

  As a countermeasure for recovering the deterioration of the function of the lining due to such a secular change, for example, a tunnel lining repair structure as shown in Patent Document 1 has been proposed.

  In this tunnel lining repair structure, a belt-like repair material extending in the circumferential direction of the tunnel along the existing tunnel lining inner surface is installed and fixed at a predetermined interval in the tunnel axis direction.

Japanese Patent No. 3549504

  In this tunnel lining repair structure, a steel plate, a hot dip galvanized steel plate, or a carbon fiber or glass fiber plate or the like is adopted as the material of the belt-like repair material.

  However, when using a steel plate or a hot dip galvanized steel plate, there are problems that the weight is large, the workability is poor, it is difficult to cope with unevenness, and a rust prevention treatment called hot dip galvanization is required.

  In the case of carbon fiber and glass fiber, it is lighter and has better workability than steel plate and hot-dip galvanized steel plate, but it is prone to cracking due to different physical properties such as thermal expansion, and carbon fiber is expensive. There is a problem that.

  In addition, steel plates, hot-dip galvanized steel plates, or carbon fibers have conductivity, so that they are difficult to apply to railway structures, and glass fibers have low heat resistance.

  The object of the present invention is lightweight, flexible against unevenness, etc., good workability, inexpensive, insulating, heat-resistant reinforcing material, structural reinforcing structure and structural reinforcement It is to provide a method.

(1) In order to achieve the above-mentioned object, the reinforcing material of the present invention is a reinforcing material that is attached to the surface of a structure to reinforce,
Forming basalt fiber into a plate ,
One or a plurality of square grooves, dovetail grooves, meandering square grooves, or dovetail grooves are formed on the adhesion surface to the structure .

  According to the present invention, by making it possible to attach a reinforcing material in which a basalt fiber is formed in a plate shape to the surface of the structure, it is lightweight, flexible against unevenness, has good workability, is inexpensive, A reinforcing material having insulating properties and heat resistance can be obtained.

(2) In the present invention, the reinforcing material may be formed in a band shape having a thickness of 0.5 mm to 5.0 mm.

  With such a configuration, it is possible to improve the workability with an appropriate size while having sufficient reinforcement strength.

(3) In the present invention, the reinforcing material may be formed in a lattice shape having a thickness of 0.5 mm to 5.0 mm and orthogonal to each other.

  With such a configuration, reinforcement in two orthogonal directions can be easily performed while having a sufficient reinforcement height.

(4) In the reinforcing structure of the structure of the present invention, the reinforcing structure of the structure using the reinforcing material of (2),
The reinforcing material is attached to the surface of a long structure over the short direction, and the reinforcing material is arranged at a predetermined pitch in the longitudinal direction.

  ADVANTAGE OF THE INVENTION According to this invention, a favorable reinforcement structure can be obtained reliably by arrange | positioning the reinforcing material attached over the transversal direction of the structure with the predetermined pitch according to the reinforcement condition in the longitudinal direction.

(5) In the present invention, in (4),
The reinforcing material may be attached to the surface of the long structure over the longitudinal direction, and the reinforcing material may be disposed at a predetermined pitch in the short direction.

  By setting it as such a structure, in addition to the state of (4), since a reinforcing material is attached over a longitudinal direction, a more reliable reinforcement structure can be obtained.

(6) In the present invention, in (5),
A mesh sheet formed of basalt fibers can be attached to the surface of the structure surrounded by the reinforcing material pasted in the short side direction and the long side direction.

  By adopting such a configuration, by attaching a mesh sheet formed of basalt fiber to a portion surrounded by a reinforcing material that is attached crossing the short side direction and the long side direction, the reinforcing effect is further enhanced. The peeling off of the structure surface can be reliably prevented.

(7) In the method for reinforcing a structure according to the present invention, a reinforcing material or a mesh sheet is attached later to the surface of the existing structure, and the structure according to any one of (4) to (6) The reinforcing structure is formed.

  In the present invention, it is possible to reliably repair and reinforce an existing structure.

(8) In the method for reinforcing another structure of the present invention, when a new structure is constructed, a reinforcing material or a mesh sheet is attached in advance to the surface of the new structure. The reinforcing structure of any one of the structures is formed.

  According to the present invention, it is possible to reliably reinforce a newly installed structure.

It is a perspective view which shows the reinforcement structure of the structure concerning one embodiment of this invention. It is a perspective view which shows the reinforcement structure of the structure concerning other embodiment of this invention. It is a perspective view which shows the reinforcement structure of the structure concerning other embodiment of this invention. It is a fragmentary perspective view of the reinforcing material shown in FIGS. It is a perspective view which shows the modification of a reinforcing material. It is a perspective view which shows the other modification of a reinforcing material. It is a top view which shows the other modification of a reinforcing material. It is a top view which shows the other modification of a reinforcing material. It is a figure which shows the material physical property comparison of a steel plate, a carbon plate, and a basalt plate. It is a figure which shows a basalt plate, a carbon plate, and the bending toughness test result in the case of no reinforcement.

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

  FIG. 1 is a diagram showing a reinforcing structure for a structure according to an embodiment of the present invention. As an example of a long structure, an existing tunnel (for example, a mountain tunnel) 10 is repaired and reinforced. Show.

In the reinforcing structure of this structure, a strip-shaped reinforcing material 12 is attached to the inner surface of the tunnel 10 in the short direction (circumferential direction of the tunnel 10), and the reinforcing material 12 is set in the longitudinal direction (axial direction of the tunnel 10). They are arranged at a predetermined pitch.
As shown in FIG. 4, the reinforcing member 12 is formed of a basalt fiber in a flat plate shape having a predetermined thickness t of 0.5 mm to 5.0 mm and a width w of 50 mm to 150 mm. It is as.

  The pitch p1 of the reinforcing material 12 in the longitudinal direction of the tunnel 12 is set to 0.3 m to 2.0 m.

  Further, the reinforcing material 12 is adhered to the inner surface of the tunnel 10 with an adhesive, and if the surface of the adhesive surface 14 is flat as shown in FIG. 4, a sufficient adhesive force cannot be obtained. In some cases, for example, as shown in FIG. 5, a plurality of square grooves 16 extending in the longitudinal direction are formed on the adhesive surface 14 of the reinforcing member 12, or on the adhesive surface 14 of the reinforcing member 12 as shown in FIG. 6. A plurality of dovetail grooves 18 extending in the longitudinal direction may be formed, and furthermore, as shown in FIG. 7, the square grooves 16 and the dovetail grooves 18 may be formed in a meandering shape to increase the adhesive force. it can.

  The basalt fiber that is the material of the reinforcing material 12 is a thin fiber made by injecting natural basalt basalt, and is an environmentally-friendly fiber that replaces glass fiber and carbon fiber. The main feature is basalt It can be said that it is superior in heat resistance compared to other fiber materials.

  FIG. 9 shows a material property comparison among the basalt fiber plate, the steel plate SS400, and the carbon fiber plate.

  As shown in FIG. 9, the basalt fiber plate has the following characteristics.

  The tensile strength is about 1/2 to 1/3 times that of the carbon fiber plate, but the elastic modulus is small and the elongation to break is large, so that an improvement in toughness can be expected.

  The linear expansion coefficient is the same as that of concrete, and there is no breakage of the adhesive after use.

  Light weight and good workability (100mm width, about 270g / m).

  As for acid resistance and alkali resistance, there is no decrease in strength after one month of immersion test.

  It is insulative and can be applied to railway structures.

  Next, FIG. 10 shows the results of bending toughness tests when reinforced with a basalt fiber plate, when reinforced with a carbon fiber plate, and without reinforcement.

  The test specimen is concrete 150 mm x 150 mm, plate width 3 mm x 2 pieces (adhered to the bottom).

  Without reinforcement, it breaks brittlely after maximum load.

  When reinforced with a carbon fiber plate, the maximum load increases, but the adhesion of the plate breaks at an early stage (about 0.7 mm), and the load decreases rapidly.

  The basalt fiber plate does not have a sudden load drop even after the maximum load, has high toughness, and gradually ends with adhesion being broken stepwise.

  In terms of actual structure (plate width 100 mm x thickness 1 mm @ 500 mm), the load bearing capacity is about 1.3 times and the bending toughness coefficient is 4.5 times compared to the case without reinforcement.

  In this way, by making it possible to attach the reinforcing material 12 in which the basalt fiber is formed in a plate shape to the surface of the tunnel 10, it is lightweight, flexible against unevenness, has good workability, is inexpensive, and is insulated. Have heat resistance and heat resistance.

  Further, by arranging the reinforcing members 12 attached over the short direction of the tunnel 10 at a predetermined pitch in the longitudinal direction according to the reinforcing state, a good reinforcing structure can be obtained with certainty.

  FIG. 2 is a view showing a reinforcing structure of a structure according to another embodiment of the present invention.

  In this embodiment, the belt-like reinforcing material 12 is attached to the inner surface of the tunnel 10 in the short direction (circumferential direction of the tunnel 10) in the embodiment of FIG. 1, and the reinforcing material 12 is attached to the longitudinal direction (tunnel). In addition to the state in which the reinforcing material 12 is arranged at a predetermined pitch in the axial direction of the tunnel 10, the reinforcing material 12 is attached to the inner surface of the tunnel 10 in the longitudinal direction (the axial direction of the tunnel 10). In the circumferential direction) at a predetermined pitch.

  The pitch p2 in the circumferential direction of the tunnel is 0.3 m to 2.0 m, similar to the pitch p1 of the reinforcing material 12 in the longitudinal direction of the tunnel 12.

  As described above, in the present embodiment, since the reinforcing material 12 extending in the circumferential direction and the reinforcing material 12 extending in the axial direction are in a lattice shape, the reinforcing structure is more reliable than that in the embodiment of FIG. Can be obtained.

  In this case, instead of attaching the strip-shaped reinforcing member 12 to the inner surface of the tunnel 10 separately in the circumferential direction and the axial direction and forming a lattice shape, as shown in FIG. It is also possible to prepare the reinforcing member 20 having the space portions 22 formed in a lattice shape orthogonal to each other at 0.0 mm, and to bond the reinforcing member 20 to the inner surface of the tunnel 10.

  In this case, since the arrangement direction of the basalt fibers has an influence on the strength, the plates may be bonded in advance by combining plates in which the arrangement directions of the fibers are different by 90 degrees.

  FIG. 3 is a diagram showing a reinforcing structure of a structure according to still another embodiment of the present invention.

  The reinforcing structure of the structure in this embodiment is formed by reinforcing members 12 and 12 orthogonal to the lattice shape attached in the short direction (circumferential direction of the tunnel) and the long direction (axial direction of the tunnel 10) shown in FIG. By attaching the mesh sheet 24 formed of basalt fiber to the inner surface of the tunnel 10 in the enclosed portion, the reinforcing effect can be further enhanced and the inner surface of the tunnel 10 can be reliably prevented from falling off. To be able to.

  Even when the reinforcing material 20 shown in FIG. 8 is used, the mesh sheet 24 may be adhered to the inner surface of the tunnel 10 exposed in the space 22.

  The structure reinforcing structure in such a corner embodiment is a method of reinforcing a retrofitted structure in which the reinforcing members 12, 20 or the mesh sheet 24 are attached later to the inner surface of the tunnel 10 which is an existing structure. The existing structure is surely repaired and reinforced. However, in the method of reinforcing the other structure of the present invention, when the tunnel 10 which is a new structure is constructed, The reinforcement structure 12 or 20 or the mesh sheet 24 may be attached in advance to the inner surface of the tunnel 10 to form the reinforcement structure of the structure as described above, thereby reliably reinforcing the new structure. .

  The present invention is not limited to the pre-planning embodiment, and can be modified into various forms within the scope of the gist of the present invention.

  In each of the embodiments described above, the case of a mountain tunnel as a structure has been described. However, the present invention is not limited to this example, and the present invention can be applied to a structure other than a tunnel such as a shield tunnel or a bridge.

  Further, in the portion where the cracks are closed, it is possible to prevent the concrete pieces from peeling off by attaching a basalt fiber plate-like board with an anchor. The shape of the plate-like board can be manufactured in accordance with a dimension in which cracks are closed, for example, 1.0 m × 1.0 m × 2.0 m in thickness.

DESCRIPTION OF SYMBOLS 10 Tunnel 12, 20 Reinforcement material 14 Adhesion surface 22 Space part 24 Mesh sheet

Claims (8)

A reinforcing material that is attached to the surface of a structure to reinforce,
Forming basalt fiber into a plate ,
A reinforcing material , wherein one or a plurality of square grooves, dovetail grooves, or meandering square grooves, or dovetail grooves are formed on an adhesive surface to the structure . In claim 1,
A reinforcing material characterized by being formed in a strip shape having a thickness of 0.5 mm to 5.0 mm. In claim 1,
A reinforcing material having a thickness of 0.5 mm to 5.0 mm and an orthogonal lattice shape. A reinforcing structure for a structure using the reinforcing material according to claim 2,
A reinforcing structure for a structure, wherein the reinforcing material is attached to the surface of a long structure over the short direction, and the reinforcing material is arranged at a predetermined pitch in the longitudinal direction. In claim 4,
A reinforcing structure for a structure, wherein the reinforcing material is attached to the surface of the long structure over the longitudinal direction, and the reinforcing material is arranged at a predetermined pitch in the lateral direction. In claim 5,
A reinforcing structure for a structure, characterized in that a mesh sheet formed of basalt fibers is attached to a surface of a structure surrounded by a reinforcing material pasted in a short direction and a long direction.   A reinforcing method for a structure according to any one of claims 4 to 6, wherein a reinforcing material or a mesh sheet is attached later to the surface of the existing structure to form the reinforcing structure of the structure according to any one of claims 4 to 6.   When constructing a new structure, a reinforcing material or a mesh sheet is attached in advance to the surface of the new structure to form the structure reinforcement structure according to any one of claims 4 to 6. How to reinforce a structure.

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