JP3830399B2 - Fiber reinforced concrete wall for shield excavation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to a structure of a fiber reinforced concrete wall for shield excavation in a tunnel excavation shaft having a start reaching portion for starting or reaching a shield machine for excavating underground, and in particular, It is related with the structure of the fiber reinforced concrete wall of a part.
[0002]
[Prior art]
As shown in FIGS. 1 and 2, the tunnel digging shaft 1 is constructed by a reinforced concrete wall 2 and a bottom plate 3, etc., but the shield digging machine 4 of the shaft starts or reaches the shield portion at the opening. It has been proposed and practiced to use a fiber reinforced concrete wall 10 so that it can be excavated by the excavator 4.
[0003]
That is, the fiber reinforced concrete wall 10 is made of a fiber reinforcing material (FRP reinforcing material) 11 made by impregnating carbon fiber, organic fiber or the like with a resin as a reinforcing bar. It is assembled and embedded in concrete, and excavation by the shield machine 4 is possible.
[0004]
Further, in the conventional shaft 1 having the above-described structure, in the fiber reinforced concrete wall 10, as in the concrete wall 2, the inner and outer peripheral portions 12 are about 50 mm thick. It is a concrete layer covering the reinforcing material 11 and is called “cover”, and the fiber reinforcing material 11 is not provided.
[0005]
[Problems to be solved by the invention]
According to the results of the research experiment conducted by the inventors of the present application, the shield machine 4 is made of fiber reinforced concrete while forming the opening 5 (see FIGS. 1 and 3) having a cutting diameter D, particularly in the shield machine starter of the vertical shaft. When the wall body 10 is cut and penetrated to enter the adjacent ground, the outer wall portion of the opening 5, that is, the “cover” portion 12 may be largely cracked. The large cracked “cover” portion 12 becomes a concrete lump, which is taken into the chamber 41 of the shield machine 4 and may be closed when the chamber 41 is discharged. In that case, the shield machine 4 must be completely stopped and the concrete block must be removed manually.
[0006]
In addition, when the ground is soft, a concrete lump that is not taken into the chamber 41 of the shield machine 4 may rotate together with the cutting turntable, causing the ground to loosen and eventually the ground to sink. It is not preferable.
[0007]
Accordingly, an object of the present invention is to prevent large cracks in the outer periphery and the cover part of the start portion of the shield machine in a tunnel digging shaft, blockage of the chamber inlet of the shield machine, and the ground by the shield machine It is an object of the present invention to provide a fiber-reinforced concrete wall body capable of avoiding the settlement of water.
[0008]
[Means for Solving the Problems]
The above object is achieved by the fiber reinforced concrete wall according to the present invention. In summary, the present invention provides a fiber reinforced concrete wall for shield excavation in a tunnel excavation shaft having a start reaching portion for starting or reaching a shield excavator,
A fiber reinforced concrete wall for shield excavation, wherein at least one layer of FRP lattice material is installed on the outer cover portion of the fiber reinforced concrete wall so as to cover an area larger than the cutting opening diameter of the shield machine. It is.
[0009]
According to an embodiment of the present invention, the FRP lattice material has vertical reinforcing bars and horizontal reinforcing bars arranged in a lattice shape.
[0010]
According to another embodiment of the present invention, the longitudinal reinforcing bars and the lateral reinforcing bars are formed by laminating a plurality of band-shaped reinforcing fibers in which reinforcing fibers are arranged in one direction and impregnated with a matrix resin.
[0011]
According to another embodiment of the present invention, the reinforcing fiber is an inorganic fiber such as carbon fiber, glass fiber, ceramic fiber or boron fiber; metal fiber such as titanium or steel; aramid, polyester, polyethylene, nylon, vinylon, polyacetal. , PBO, organic fibers such as high-strength polypropylene; or a hybrid type in which a plurality of types of the fibers are mixed, and the matrix resin is a vinyl ester resin, unsaturated It may contain at least one radical reaction resin such as polyester resin, polyamide resin, room temperature curable epoxy resin, thermosetting epoxy resin, polycarbonate resin, urethane resin, or MMA.
[0012]
According to another embodiment of the present invention, the vertical reinforcing bars and the horizontal reinforcing bars have a reinforcing bar width (w) of 3 to 20 mm, a thickness (t) of 1 to 15 mm, and an interstitial distance (W1) of 25. ~ 250mm.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the fiber reinforced concrete wall according to the present invention will be described in more detail with reference to the drawings.
[0014]
The present invention can be applied to the fiber reinforced concrete wall of the tunnel digging shaft 1 shown in FIG. 1 and is characterized by the structure of the outer wall portion of the starting portion of the shield machine, that is, the “cover” portion. Therefore, regarding the whole structure of the tunnel digging shaft 1 and the fiber reinforced concrete wall body 10 in which the present invention is adopted, the above explanation is used and further explanation is omitted. Below, the characteristic part of this invention is demonstrated.
[0015]
In FIG. 2, a part of the fiber reinforced concrete wall body 10 of the present invention constituting the tunnel digging shaft 1 is shown in cross section.
[0016]
In the present embodiment, the fiber reinforced concrete wall 10 has one or more layers of FRP lattice material 100 (100a, 100b), for example, 1 on the cover portion 12, that is, the outer wall portion of the starting portion of the shield machine 4. Three to three layers are arranged. In the embodiment shown in FIG. 2, two layers, that is, the first FRP lattice material 100a is located at a distance (L1) of 3 cm from the fiber reinforcing material 11, and the second FRP lattice material 100b is further distance (L2). It is installed at a position 5 cm away.
[0017]
As shown in FIG. 3, the FRP lattice material 100 (100a, 100b) is arranged to extend to a region larger than the diameter D of the cutting opening 5 of the shield machine 4, and at least from the cutting opening diameter. It is installed over an area 10 to 50 cm larger.
[0018]
The diameter D of the cutting opening 5 is, for example, 7 m. In this case, as shown in FIG. 3, the fiber reinforced concrete wall 10 has a longitudinal (H1) of 7.3 m and a lateral (H2) of 7.3 m. Correspondingly, the FRP lattice material 100 is also in the same region as the fiber reinforced concrete wall 10, that is, a rectangle with a height (H1) of 7.5 m and a width (H2) of 7.5 m. It can be installed in shape. The present invention is not limited to this. For example, the FRP lattice material 100 may be circular instead of rectangular. Further, each of the lattice members 100a and 100b does not need to be a single sheet, and may be divided into a plurality of pieces.
[0019]
Next, the FRP lattice material 100 will be described.
[0020]
An embodiment of the FRP lattice material 100 used in the present invention is shown in FIGS. In the present embodiment, the FRP lattice material 100 usually includes a plurality of reinforcing bars arranged in a grid pattern intersecting at right angles, that is, a vertical reinforcing bar 101 and a horizontal reinforcing bar 102, and each reinforcing bar 101, 102 is formed by laminating a plurality of band-like reinforcing fibers in which reinforcing fibers are arranged in one direction and impregnated with a matrix resin.
[0021]
Reinforcing fibers include inorganic fibers such as carbon fiber, glass fiber, ceramic fiber, and boron fiber; metal fibers such as titanium and steel; organic fibers such as aramid, polyester, polyethylene, nylon, vinylon, polyacetal, PBO, and high-strength polypropylene. Or a hybrid type in which plural types of the fibers are mixed.
[0022]
In addition, as the matrix resin, at least one or more radical reaction resins such as vinyl ester resin, unsaturated polyester resin, polyamide resin, room temperature curing epoxy resin, thermosetting epoxy resin, polycarbonate resin, urethane resin, or MMA are used. Including can be used.
[0023]
Further, the reinforcing bars 101 and 102 used in the present embodiment have a reinforcing bar width (w) of 3 to 20 mm, a thickness (t) of 1 to 15 mm, and an interstitial distance (W1) of 25 to 250 mm. It is molded and cured into a lattice plate shape to form a sheet-like FRP lattice material 100 as a whole. As shown in FIG. 5, the FRP lattice material 100 is molded and cured so that the thickness of the crossing portion of the streaks is substantially equal to the thickness of the other portions.
[0024]
The FRP lattice material 100 is located on the outer “cover” portion 12 of the fiber reinforced concrete wall 10, that is, on the outer peripheral portion of the shaft 2, and is installed in one to three layers as described above.
[0025]
The FRP lattice member 100 may be installed by any method. For example, the FRP lattice member 100 is included in the fiber reinforced concrete wall 10, for example, a ridge-like, mesh-like, or lattice-like fiber reinforcement. By connecting to the (FRP reinforcing material) 11 through an appropriate fastener, only a desired layer is installed adjacent to the fiber reinforcing material 11. Concrete is placed in the assembly of the fiber reinforcing material 11 and the FRP lattice material 100 thus manufactured.
[0026]
Thus, the excavation opening 5 that can be excavated by the shield excavator 4 in the tunnel excavation shaft 2 and the start portion of the shield excavator 4 in which the cover portion 12 is reinforced by the FRP lattice material 100 is defined. A fiber reinforced concrete wall 10 that can be formed is formed.
[0027]
In order to demonstrate the effect of the fiber-reinforced concrete wall 10 of the present invention, a lattice material 100 having the following specifications was produced, and two layers were attached to the outer periphery “cover” portion of the fiber-reinforced concrete wall 10 and tested. The cutting opening diameter D of the shield machine 4 was 1 m, the wall thickness of the fiber-reinforced concrete wall 10 was 0.5 m, and the thickness of the cover portion was 50 mm.
[0028]
Experimental Example / Lattice Material Reinforced Fiber: Glass Fiber Matrix Resin: Vinyl Ester Resin Reinforced Fiber: Matrix Resin = 40: 60 (vol%)
・ Dimensional reinforcing bar width (w) of the lattice material: 7 mm,
Thickness (t): 2 mm
Interstitial distance (W1): 100 mm
Overall shape: rectangle with a length of 1.3 m and a width of 1.3 m In accordance with the present invention, two layers of the lattice material 100 were installed on the outer periphery “cover” portion of the fiber-reinforced concrete wall 10 and cut by the shield machine 4. As a result of the experiment, a large crack of the cover portion 12 did not occur.
[0029]
【The invention's effect】
As described above, the present invention is a fiber reinforced concrete wall for shield excavation in a tunnel excavation shaft having a start reaching portion for starting or reaching the shield excavator, at least from the cutting opening diameter of the shield excavator. Covering a large area, the outer cover part of the fiber reinforced concrete wall has a structure in which one or more layers of FRP lattice material are installed. Therefore, in the tunnel digging shaft, the outer periphery of the starting part of the shield machine It is possible to prevent large cracks in the cover part and avoid ground scraping by the shield machine.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a schematic configuration of an embodiment of a tunneling shaft that can be provided with a fiber reinforced concrete wall body for shield excavation according to the present invention.
FIG. 2 is a cross-sectional view showing a part of a fiber reinforced concrete wall for shield excavation according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing an embodiment of the FRP lattice material of the fiber reinforced concrete wall body for shield excavation according to the present invention.
FIG. 4 is a perspective view showing an embodiment of an FRP lattice material.
FIG. 5 is a perspective view showing an embodiment of an FRP lattice material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tunnel digging shaft 2 Concrete wall 3 Concrete bottom plate 4 Shield digging machine 5 Cutting opening 10 Fiber reinforced concrete wall 11 Fiber reinforcement (FRP reinforcement)
12 Cover part 100 (100a, 100b) FRP lattice material

Claims (6)

In a fiber reinforced concrete wall for shield excavation in a tunnel excavation shaft having a start reach for starting or reaching a shield excavator,
A fiber reinforced concrete wall for shield excavation, wherein at least one layer of FRP lattice material is installed on the outer cover portion of the fiber reinforced concrete wall so as to cover an area larger than the cutting opening diameter of the shield machine. . The fiber reinforced concrete wall for shield excavation according to claim 1, wherein the FRP lattice material has vertical reinforcing bars and horizontal reinforcing bars arranged in a lattice shape. 3. The fiber-reinforced concrete for shield excavation according to claim 2, wherein the vertical reinforcing bars and the horizontal reinforcing bars are formed by laminating a plurality of band-shaped reinforcing fibers in which reinforcing fibers are arranged in one direction and impregnated with a matrix resin. Wall body. The reinforcing fiber is an inorganic fiber such as carbon fiber, glass fiber, ceramic fiber or boron fiber; metal fiber such as titanium or steel; organic fiber such as aramid, polyester, polyethylene, nylon, vinylon, polyacetal, PBO, or high-strength polypropylene. The fiber-reinforced concrete wall for shield excavation according to claim 3, wherein the fiber is a hybrid type in which a plurality of types of fibers are mixed. The matrix resin contains at least one radical reaction resin such as vinyl ester resin, unsaturated polyester resin, polyamide resin, room temperature curable epoxy resin, thermosetting epoxy resin, polycarbonate resin, urethane resin, or MMA. The fiber reinforced concrete wall body for shield excavation according to claim 3 or 4. The vertical reinforcing bars and the horizontal reinforcing bars have a reinforcing bar width (w) of 3 to 20 mm, a thickness (t) of 1 to 15 mm, and an interstitial distance (W1) of 25 to 250 mm. Item 6. A fiber-reinforced concrete wall for shield excavation according to any one of Items 2 to 5.

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