JP2818078B2 - Repair structure on the inner surface of water tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner surface of a waterway tunnel for repairing an inner surface which has been deteriorated due to a long-term water flow in a waterway tunnel having a non-circular cross section which is used for agricultural water or water for hydroelectric power generation. Repair structure.

[0002]

2. Description of the Related Art In repairing a waterway tunnel, a waterway tunnel having a circular cross section can be efficiently constructed by applying a pipe-in-pipe method of laying a new pipe in the tunnel. However, in the case of a tunnel with a horseshoe cross-section, the pipe-in-pipe method cannot be applied because the cross-sectional area of water passage is greatly reduced. In addition, since there is a variety of dimensions for each tunnel, generally, a steel plate having a split structure manufactured in a factory in advance in accordance with the dimensions of the tunnel is welded on site.

There is also known a method in which a repair member made of FRP is individually manufactured according to the cross-sectional shape and dimensions of the tunnel, and is assembled on site.

[0004]

However, in the case of manufacturing a steel sheet according to the tunnel dimensions in a factory and welding it on site, the workability is poor due to the large weight, and the hydraulic properties are required unless the inner surface treatment is separately performed. However, there are problems such as poor corrosion and easy corrosion.

[0005] On the other hand, the use of FRP products has the advantages that they are lighter and easier to construct than steel plates, and that they have excellent hydraulic characteristics and abrasion resistance on the inner surface, but they need to be manufactured separately for each tunnel. Since it cannot be applied to other tunnels,
As a result, there is a problem that the cost is increased.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such a problem and to make it possible to repair the inner surface of a channel tunnel having an arbitrary cross-sectional shape with good workability and at low cost while making use of the characteristics of FRP. .

[0007]

In order to achieve the above object, the present invention provides an elongated FRP along the length of a waterway tunnel.
A plurality of plates are arranged in the circumferential direction of the tunnel via a water-tight joining member to cover the inner surface of the waterway tunnel.

[0008]

According to such a configuration, a plurality of FRP plates are arranged along the inner surface of the waterway tunnel to cover the inner surface of the waterway tunnel, so that the smooth and watertight FRP inner surface waterway tunnel has a cross-sectional shape. Regardless, it is regenerated while minimizing the decrease in cross-sectional area. Since the FRP plate and the joining member can be mass-produced, repair at low cost is possible.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes an aged waterway tunnel to be repaired, which has a horseshoe-shaped cross-sectional shape in which the inner diameter at the upper portion is R0, the inner diameter at both lower sides is R1, and the inner bottom diameter is R2. By arranging a plurality of elongated FRP plates 3 along the longitudinal direction of the tunnel 1 in the circumferential direction of the tunnel, the waterway tunnel 1
Of the inner surface 2. The FRP plates 3 and 3 are joined by a joining member 4 having water tightness, and a gap between the FRP plate 3 and the joining member 4 and the tunnel inner surface 2 is filled with grout 5 such as air mortar. .

As shown in FIG. 2, the FRP plate 3 is formed in a cross-sectional shape of a working shape in which a cut groove 6 is formed at the center position in the plate thickness direction on both side end surfaces toward the center in the width direction. It can be mass-produced by pultrusion molding. The width W0 of the FRP plate 3 is set to, for example, about 120 mm. By arranging a plurality of the FRP plates 3 in the circumferential direction, the repaired finish surface having a substantially similar shape to the water channel tunnel 1 having an arbitrary size and a cross-sectional shape. Can be formed. The length of the FRP plate 3 is set to about 2 to 4 m for ease of operation, and the FRP plates 3 adjacent to each other in the circumferential direction are staggered in the longitudinal direction so as to be staggered. I have.

As shown in FIG. 3, the joining member 4 is made of FRP.
Insert pieces 7 that can be inserted into the cut grooves 6 of the plate 3 project from both end faces thereof, and a water-stopping rubber material 8 having a sealing tongue piece 8a is mounted on the insert piece 7. This joining member 4
Can also be mass-produced by pultrusion.

When the FRP plate 3 and the joining member 4 are used, as shown in FIG. 2, the insertion piece 7 on which the waterproof rubber material 8 is mounted is fitted into the cut groove 6 of the FRP plate 3 to join. The FRP plates 3 can be sequentially joined via the member 4, and a repair inner surface 10 along the inner surface 2 of the water channel tunnel 1 can be formed as shown in FIG.

For a curved surface having a relatively large radius of curvature, even if the joining member 4 in which the insertion piece 7 projects straight from the main body as shown in FIG. The compression can handle the bending. In addition, as shown in FIG. 4, it is preferable to use a joining member 4a in which the insertion piece 7 is inclined and protruded as shown in FIG. 4 for a portion having a small radius of curvature such as a corner portion between the side wall and the invert.

In addition, due to the size of the tunnel, a fixed width F
If the final circumference does not match with the RP plate 3 alone, as shown in FIG. 2, one to several FRP plates 3 are evenly cut so that the width is W1, and the dimension is adjusted. It is preferable to use a specially shaped one including the connection member 4.

Further, when it is necessary to prevent the deformation of the FRP plate 3 against the pressure at the time of filling the grout 5 or applying a hydraulic pressure and to increase the bending rigidity, as shown by the imaginary line in FIG. May be integrally formed.

Next, the fixing structure of the FRP plate 3 will be described in detail with reference to FIGS. The FRP plate 3 is fixed at several points in the longitudinal direction by fixing means 11 as shown in FIG. The fixing means 11 includes a pair of anchor bolts 13 inserted into and fixed to an anchor hole 12 pierced by a hammer drill or the like in the tunnel inner surface 2, a fixing bracket 14 supported by the anchor bolts 13,
It is composed of a stainless steel countersunk bolt 15 for fastening the P plate 3 to the fixture 14 and fixing it.

The anchor bolt 13 is fixed to the inner surface 2 of the tunnel by inserting a resin capsule 16 or the like into the anchor hole 12 and driving it in. However, a hole-in anchor may be used.

As shown in FIG. 6, the fixing bracket 14 has a structure in which insertion holes 17 for the anchor bolts 13 are formed on both sides of the main plate 14a, and a socket 18 is welded to the center thereof. The insertion hole 17 is formed to have a larger diameter than the diameter of the anchor bolt 13, and is configured to absorb an error in the driving position of the anchor bolt 13. A pair of nuts 20 screwed to the anchor bolt 13
By holding the main plate 14a from both sides through the washers 19, the height of the fixing bracket 14 can be adjusted.
Is fixed. Furthermore, this allows the tunnel inner surface 2
It is possible to absorb even a slight inclination of the anchor bolt 13 to be cast in the normal direction.

The FRP plate 3 is formed by passing a countersunk bolt 15 through a countersunk drill hole formed at a predetermined position.
Is screwed into the socket 18 so that the fixture 14
Fixed to The head of the countersunk bolt 15 is prevented from protruding from the surface of the FRP plate 3 by fitting into the countersunk hole of the FRP plate 3. This allows FRP
The smoothness of the inner surface of the plate 3 is ensured, and the generation of resistance to the water flow in the pipe is prevented. A water-stopping material 21 such as an O-ring is disposed below the head of the flathead bolt 15 so that the perforated portion is watertight.

[0020]

As described above, according to the present invention, since a plurality of elongated FRP plates are arranged in the circumferential direction of the tunnel via the water-tight joining member to cover the inner surface of the tunnel, the cross-sectional area of the water passage can be reduced. Smooth, water-tight FR while minimizing
Since the water channel tunnel on the inner surface of P can be regenerated and the FRP plate and the joining member can be mass-produced, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a waterway tunnel showing a repair structure of an inner surface of the waterway tunnel according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the FRP plate in FIG.

FIG. 3 is a sectional view of a joining member between the FRP plates.

FIG. 4 is a sectional view of another joining member between the FRP plates.

FIG. 5 is a sectional view of a fixing means of the FRP plate.

FIG. 6 is a plan view of a fixing bracket in the fixing means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterway tunnel 2 Inner surface 3 FRP board 4 Joining member

Continuation of the front page (56) References JP-A-1-97724 (JP, A) JP-A-63-126438 (JP, A) JP-A-55-54440 (JP, A) JP-A-6-185105 (JP, A) , A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02B 9/00-13/02 E02B 5/02 E21D 11/04

Claims (1)

(57) [Claims] 1. An elongated F along a longitudinal direction of a waterway tunnel.
A repair structure for an inner surface of a waterway tunnel, wherein a plurality of RP plates are arranged in a circumferential direction of the tunnel via a water-tight joining member to cover an inner surface of the waterway tunnel.