JP2010209555A - Packing, construction method for laying embedded form, and tunnel constructed by the construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packing capable of preventing cavitation from occurring at the joint of embedded forms which are adjacent to each other in the longitudinal direction of a tunnel. <P>SOLUTION: This packing 2 is installed at the joint 7 of embedded forms which are connected to each other in the longitudinal direction of a tunnel 1 among the joints of a plurality of embedded forms 6 laid down in the tunnel which are connected to each other in the longitudinal direction and the circumferential direction of the tunnel so as to hold the ends of the embedded forms 6 from the inner peripheral surface 6a side and the outer peripheral surface 6b side. The packing 2 includes a head part 3 provided so as to project to the inner peripheral surface 6a side of the embedded forms 6, a leg part 5 provided so as to project to the outer peripheral surface 6b side of the embedded forms 6, and a connection part 4 one end of which is connected to the head part 3 and the other end of which is connected to the leg part 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a packing provided at a joint portion between embedded molds adjacent to each other in the longitudinal direction of a tunnel in a plurality of embedded molds laid in a tunnel through which water flows.

  2. Description of the Related Art Conventionally, a plurality of panel-shaped embedded molds are connected to the inner peripheral surface of a tunnel through which water flows in the circumferential direction and the longitudinal direction of the tunnel, respectively, and are attached by fixing means. And in order to block the clearance gap formed between adjacent embedding formwork, a water stop material is provided in the clearance gap.

  For example, Patent Document 1 discloses a method of attaching a seal rubber to a side end surface of an embedded formwork. This is because when the embedded form is laid in the tunnel, the seal rubber is crushed between the adjacent embedded forms, and the gap formed between the adjacent embedded forms is sealed and water is stopped. .

JP 2002-213194 A

  However, in the method described in Patent Document 1, since only a seal rubber is interposed in a gap formed between adjacent embedded molds, a radial shift between these embedded molds, that is, a mistake When this occurs, cavitation occurs when water flows through the stepped portion due to this mistake, and the end portion of the embedded formwork is worn. As described above, when the embedded formwork is worn, water easily enters the lining concrete, which may adversely affect the durability of the tunnel.

  Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a packing that prevents the occurrence of cavitation at the joint portion between the embedded molds adjacent in the longitudinal direction of the tunnel.

  In the packing of the present invention, in a plurality of embedded molds laid in a tunnel through which water flows, the ends of the embedded molds are connected to the joints between the embedded molds adjacent in the longitudinal direction of the tunnel. It is provided so as to be sandwiched from the inner peripheral surface side and the outer peripheral surface side.

  ADVANTAGE OF THE INVENTION According to this invention, the mistake of adjacent embedded formwork can be suppressed by attaching packing to the joint part of the embedded formwork adjacent in the longitudinal direction of a tunnel. Therefore, the occurrence of cavitation in the water and soil passing through the tunnel can be reduced, so that the wear of the embedded form is reduced and the durability of the lining concrete is improved.

  Further, in the present invention, the packing is provided so as to straddle a gap formed between the adjacent embedded molds and in contact with an inner peripheral surface of the embedded mold, and the cross-sectional shape in the longitudinal direction is convex In such a manner that the heads having a continuous shape such that both sides are acute angles and there are no corners on the surface, and the outer peripheral surface side of the embedded mold form, the gap formed between the adjacent embedded mold forms is straddled. It is good also as being comprised from the connection part interposed by the leg part provided in 1 and the other end to the said head, and the other end being connected to the said leg part, and interposing between the said adjacent formwork.

  According to the present invention, the head disposed on the inner peripheral surface side of the embedded formwork is formed in a continuous shape with acute angles on both sides and no corners on the surface, so cavitation occurs when water flows. Can be more reliably prevented. Moreover, since the head is in contact with the inner peripheral surfaces of the adjacent embedded molds, it is possible to prevent water and earth and sand from flowing into the gap formed between the adjacent embedded molds. Furthermore, since the leg portion is provided so as to close the gap on the outer peripheral surface side of the embedded formwork, it is possible to prevent the packing from slipping into the tunnel.

  In this case, the longitudinal sectional shape of the head may be, for example, an arc shape.

  Moreover, in this invention, if the said packing consists of an elastic body, it can closely_contact | adhere to an embedded formwork. Accordingly, it is possible to prevent water and earth and sand from flowing into the gap formed between the adjacent embedded molds.

  Further, the method for laying a buried mold according to the present invention includes a plurality of buried molds laid in a tunnel through which water flows, wherein the buried mold is connected to a joint portion between the buried molds adjacent in the longitudinal direction of the tunnel. A packing is provided for sandwiching the end portions of the frame from the inner peripheral surface side and the outer peripheral surface side.

  Furthermore, in this invention, a tunnel is good also as being constructed | assembled by the construction method of the said embedded formwork.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the cavitation in the seam part of the embedding formwork adjacent in the longitudinal direction of a tunnel can be prevented.

It is a top view which shows the tunnel which concerns on embodiment of this invention. It is sectional drawing of the circumferential direction which shows the tunnel which concerns on embodiment of this invention. FIG. 2 is a cross-sectional enlarged view taken along the line AA in FIG. It is a figure which shows the other Example of the cross-sectional shape of packing. It is a figure which shows the other Example of the installation position of packing.

  Hereinafter, preferred embodiments of the packing according to the present invention will be described in detail with reference to the drawings.

  1 and 2 are a plan view and a circumferential cross-sectional view showing a tunnel 1 according to an embodiment of the present invention, respectively. Moreover, FIG. 3 shows the state which installed the packing 2 between the adjacent embedding formwork 6, and is an AA cross-sectional enlarged view of FIG.

  As shown in FIGS. 1 to 3, the packing 2 includes a plurality of embedded molds 6 laid in the tunnel 1 in a longitudinal direction of the tunnel 1 (hereinafter referred to as a tunnel longitudinal direction) and a circumferential direction (hereinafter referred to as a tunnel circumferential direction). Among the joint portions 7 and 11 connected to each other, the joint portions 7 connected in the longitudinal direction of the tunnel are provided so that the ends of the embedded mold 6 are sandwiched between the inner peripheral surface 6a side and the outer peripheral surface 6b side. It has been.

  The packing 2 includes a head 3 provided so as to protrude toward the inner peripheral surface 6 a side of the embedded mold 6, a leg portion 5 provided so as to protrude toward the outer peripheral surface 6 b of the embedded mold 6, and one end. Is composed of a head 3 and a connecting part 4 whose other end is connected to a leg part 5.

  The head 3 is provided so as to straddle a gap 8 formed between the embedded molds 6 adjacent to each other in the tunnel longitudinal direction and to be in contact with the inner peripheral surface 6 a of the embedded mold 6. And the head 3 is formed so that the cross-sectional shape of a tunnel longitudinal direction may become circular arc shape. However, the cross-sectional shape of the head 3 is not limited to an arc shape, but may be a continuous shape (see, for example, FIG. 4) so that both sides thereof have acute angles and the surface 3 a has no corners. According to such a shape, since there is no corner on the surface 3a of the head 3, the presence of the packing 2 prevents the occurrence of cavitation.

  The leg 5 is provided so as to straddle the gap 8 formed between the adjacent embedded molds 6 and in contact with the outer peripheral surface 6 b of the embedded mold 6, so that the packing 2 escapes to the inside of the embedded mold 6. To prevent.

  The connecting portion 4 is provided in the gap 8 of the joint portion 7 of the embedded mold 6 and is provided so as to be in close contact with the side end face 6 c of the adjacent embedded mold 6.

  The packing 2 is made of an elastic body that has durability against wear caused by the flow of water and earth and sand passing through the tunnel 1 and has excellent adhesion to the embedded form 6. In this embodiment, for example, Urethane rubber was used. The head portion 3 and the connecting portion 4 of the packing 2 are in close contact with the inner peripheral surface 6a and the side end surface 6c of the embedded mold 6, respectively, and prevent water and earth and sand from flowing into the gap 8.

  Below, the laying construction method of the embedded form 6 is demonstrated according to a construction procedure.

  First, the embedded form 6 is laid in the circumferential direction of the tunnel. A seal rubber 9 is attached to the side end face 6d in the tunnel circumferential direction of the buried form 6, and when the buried form 6 is installed at a predetermined position, the buried form 6 adjacent in the tunnel circumferential direction The seal rubber 9 is crushed to seal the gap 8 formed between the embedded molds 6.

  Next, the packing 2 is attached to the side end face 6c in the tunnel longitudinal direction of the laid embedded form 6.

  Next, a new embedded form 6 is installed in the tunnel longitudinal direction of the attached packing 2. When installing a new embedded form 6, the end of the new embedded form 6 is inserted between the head 3 and the leg 5 of the packing 2, and the side end face 6 c comes into contact with the connecting part 4. Install as follows. Thereby, the head 3 and the leg 5 are in close contact with the inner peripheral surface 6a and the outer peripheral surface 6b of the new embedded mold 6, respectively, and the gap 8 formed between the adjacent embedded molds 6 is sealed. In both cases, it is possible to suppress the difference between the adjacent embedded molds 6.

  According to this embodiment described above, by attaching the packing 2 to the joint portion 7 of the buried mold 6 adjacent in the longitudinal direction of the tunnel, it is possible to suppress the misunderstanding between the adjacent buried molds 6, and the head thereof Since the surface 3 is formed such that there are no corners on the surface 3a, the occurrence of cavitation can be prevented. Therefore, wear of the embedded mold 6 due to cavitation can be prevented.

  Moreover, since the head 3 is in contact with the inner peripheral surface 6a of the adjacent embedded molds 6 and is made of an elastic body, water and earth and sand flow into the gap 8 formed between the adjacent embedded molds 6. Can be prevented.

  Furthermore, the leg portion 5 is provided on the outer peripheral surface 6 b side of the embedded form 6 so as to close the gap 8, so that the packing 2 can be prevented from slipping into the tunnel 1.

  In addition, in this embodiment, although the case where the packing 2 was installed in the joint part 7 over the perimeter except the bottom board 10 was demonstrated, it is not limited to this, The highest of the water which passes the tunnel 1 inside When the water level is set in advance, as shown in FIG. 5, the packing 2 may be installed only from the bottom panel 10 to a position slightly higher than the water level.

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Packing 3 Head 3a Surface 4 Connection part 5 Leg part 6 Embedded | molding formwork 6a Inner peripheral surface 6b Outer peripheral surface 6c Side part end face 6d of a tunnel longitudinal direction Side end face 7 of a tunnel peripheral direction Seam part 8 Crevice 9 Seal rubber 10 Bottom 11 seam

Claims (6)

  In a plurality of embedded molds laid in a tunnel through which water flows, the ends of the embedded molds are connected to the inner peripheral surface side and the outer periphery of the seams between the embedded molds adjacent in the longitudinal direction of the tunnel. A packing characterized by being sandwiched from the surface side. The packing according to claim 1,
Crossing the gap formed between the adjacent embedded molds and in contact with the inner peripheral surface of the embedded mold, the longitudinal cross-sectional shape is convex, both sides thereof are acute angles, the surface A head having a continuous shape with no corners;
Legs provided on the outer peripheral surface side of the embedded formwork so as to straddle the gap formed between the adjacent embedded formwork,
A packing comprising one end connected to the head, the other end connected to the leg, and a connecting portion interposed between the adjacent embedded molds.   The packing according to claim 2, wherein a cross-sectional shape of the head in the longitudinal direction is an arc shape.   The said packing as described in any one of Claims 1-3 consists of an elastic body, The packing characterized by the above-mentioned.   In a plurality of embedded molds laid in a tunnel through which water flows, the ends of the embedded molds are connected to the inner peripheral surface side and the outer periphery of the seams between the embedded molds adjacent in the longitudinal direction of the tunnel. A method for laying an embedded formwork, characterized by installing a packing for sandwiching from the surface side.   A tunnel constructed by the method of laying a buried form according to claim 5.

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