JP2019173328A - Connection method of waterproof layer and connector of waterproof layer - Google Patents

Abstract

To provide a connection method of a waterproof layer in which a waterproof layer sheet of a preceding tunnel is not damaged at the time of digging of a following tunnel, and a connector used in connection of the waterproof layer.SOLUTION: A preceding side waterproof layer 3 which is a waterproof layer of a preceding tunnel T1 is constituted by a cut-off steel plate which is constructed on the side of a top end of a middle wall concrete 2, or a fixing steel plate which is arranged on the side of a following tunnel T2 on a preceding side waterproof sheet, and the cut-off steel plate or the fixing steel plate, and a following side waterproof sheet 5a which is constructed on the side of an inner face of a timbering 4 of the following tunnel T2, or a connecting waterproof sheet 5b whose one end is connected to an end portion of the side of the preceding tunnel T1 of the following side waterproof sheet 5a are connected by using a connector 10. An end portion of the following side waterproof sheet 5a or the other end of the connecting waterproof sheet 5b is inserted in an incision portion 11 provided in an upper part of the connector 10, and is fixed to the connector 10 by a cut-off bond 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for connecting a waterproof layer of a preceding tunnel and a waterproof layer of a subsequent tunnel in a multiple tunnel, and a connector used for connecting the waterproof layer.

  Conventionally, in other tunnels such as double tunnels and triple tunnels, a concrete partition wall with a subsequent tunnel, which is a tunnel excavated later, is constructed inside the preceding tunnel, which was excavated earlier. After laying a waterproof sheet as a waterproof layer on the top end side of this partition wall, by connecting this waterproof sheet and a waterproof sheet as a waterproof layer laid on the inner surface of the support for the subsequent tunnel, Water is prevented from entering the tunnel (see, for example, Patent Document 1).

JP 2001-12199 A

  However, as shown by the broken lines in FIGS. 1B and 1C, the connection portion of the prevention layer is the narrowest portion when excavating the succeeding tunnel, so that excavation work is difficult. The waterproof layer of the preceding tunnel may be damaged during excavation.

  The present invention has been made in view of the conventional problems, and a waterproof layer connection method in which a waterproof layer of a preceding tunnel is not damaged when excavating a subsequent tunnel, and a connection tool used for connecting the waterproof layer, The purpose is to provide.

The present invention provides a preceding waterproof layer, which is a waterproof layer constructed in a preceding tunnel of a multiple tunnel and laid on the top end side of a partition wall that separates the preceding tunnel and the succeeding tunnel, and the supporting of the succeeding tunnel. A method for connecting a subsequent waterproof layer, which is a waterproof layer laid on the inner surface side of a work or shotcrete, wherein the preceding waterproof layer is laid on the top end side of the partition wall It is composed of a steel sheet or a preceding waterproof sheet that is a waterproof sheet laid on the top end side of the partition wall and a mounting iron plate disposed on the trailing tunnel side on the preceding waterproof sheet, the trailing side The waterproof layer is composed of a follower-side waterproof sheet that is a waterproof sheet laid on the inner side of the follower tunnel support or shotcrete, and a notch is formed that opens to the follower-side waterproof sheet side. At the bottom of the connector The step of welding to the trailing tunnel side of the steel plate for water stop or the mounting iron plate, and the step of fixing the end of the leading tunnel side of the trailing side waterproof sheet to the cut portion with a water stop bond, It is characterized by providing.
In this way, if the leading waterproof layer is an iron plate, or if the mounting iron plate is arranged on the trailing tunnel side on the leading waterproof sheet and covers the excavation part side of the trailing tunnel, the trailing tunnel It is possible to reliably prevent the waterproof layer of the preceding tunnel from being damaged during excavation.
Also, by welding a connector to this water-stopping iron plate or mounting iron plate, and fixing one end (the end of the preceding tunnel side) of the trailing-side waterproof sheet to this connector with a water-stopping bond, Since the layer and the waterproofing layer on the trailing side can be reliably connected, it is possible to effectively prevent the underground water from entering the tunnel.
Further, the trailing waterproof sheet is a trailing waterproof sheet that is a waterproof sheet laid on the inner side of the supporting tunnel or shotcrete of the trailing tunnel, and one end of the trailing waterproof sheet on the preceding tunnel side. It is composed of a waterproof sheet for connection connected to the end, and one end of this waterproof sheet for connection is fixed to the connector with a water-stop bond, so the leading waterproof layer and the trailing waterproof layer are securely In addition to connecting to the waterproof layer, it is possible to efficiently connect the leading waterproof layer and the trailing waterproof layer.
Further, since the water stop bond injection hole communicating with the cut portion is provided in the connector, the water stop bond is injected from the water stop bond injection hole into the cut portion. Alternatively, the connection waterproof sheet can be fixed easily and reliably.

Further, the present invention is a connection tool used in the waterproof layer connection method according to any one of claims 1 to 3 and welded to a water-stopping iron plate or a mounting water-stopping iron plate, The connection tool is provided with a notch that opens to the rear waterproof sheet side or the connection waterproof sheet side, and stores the rear waterproof sheet or the leading tunnel side end of the connection waterproof sheet. To do.
By using the connecting device having such a configuration, the trailing tunnel can be excavated without damaging the waterproof layer of the preceding tunnel, and the leading waterproof layer and the trailing waterproof layer can be reliably connected. Water can be effectively prevented from entering the tunnel.
Further, since the water stop bond injection hole communicating with the cut portion is provided in the connector, and the water stop bond from the water stop bond injection hole to the cut portion is injected, The side waterproof layer can be easily and reliably connected.

  The summary of the invention does not list all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

It is a figure which shows the connector of the waterproof sheet which concerns on this Embodiment, and its grounding position. It is a figure which shows the connection method of a waterproof sheet. It is a figure which shows the other example of the connection method of a waterproof sheet.

FIG. 1A is a view showing a waterproof sheet connector (hereinafter referred to as connector 10) according to the present embodiment. In the case of the double tunnel shown in FIG. 1B, the preceding tunnel T1 is supported. The side of the trailing tunnel T2 on the leading waterproof layer 3 that is a waterproof layer provided on the top end side of the middle wall concrete 2 as a partition wall that is constructed inside the work 1 and separates from the leading tunnel T1 and the trailing tunnel T2 The leading waterproof layer 3 is connected to the trailing waterproof layer 5 which is a waterproof layer laid on the inner surface side of the support 4 (or shotcrete) of the trailing tunnel T2.
In addition, the code | symbol 6 of Fig.1 (a) is the top end filling concrete with which it filled between the support work 1 of the preceding tunnel T1, and the preceding side waterproof layer 3. FIG.
In addition, in the case of a multiple tunnel such as the triple tunnel shown in FIG. 1 (c), on the inner wall concrete 2 that is a partition wall between the preceding tunnel T1 and the subsequent tunnel T2, inside the support tunnel 1 of the preceding tunnel T1. It is installed on the downstream tunnel T2 side on the laid upstream waterproof layer 3.
In this example, the preceding waterproof layer 3 is composed of a water-stopping iron plate, and the trailing waterproof layer 5 is laid on the inner surface side of the supporting work 4 of the trailing tunnel T2, and the trailing waterproof sheet 5a, One end is welded to the end portion on the preceding tunnel T1 side of the trailing side waterproof sheet 5a, and the other end is composed of a connecting waterproof sheet 5b inserted and fixed in a cut portion 11 of the connection tool 10 described later.
For example, a sheet made of EVA and a nonwoven fabric is preferably used as the trailing waterproof sheet 5a constituting the trailing waterproof layer 5, and the connecting waterproof sheet 5b is a sheet made of, for example, an EVA sheet. Is used.
The water-stopping iron plate that is the preceding waterproof layer 3 is an iron plate that is laid along the top edge of the middle wall concrete 2 and extends in the longitudinal direction of the tunnel (direction perpendicular to the paper surface of FIG. 1 (a)). Both end portions extend to the side of the succeeding tunnel T2 from the end portion of the support 4 of the succeeding tunnel T2, and function as a waterproof sheet for the preceding tunnel T1.
Hereinafter, in this example, a case of a double tunnel will be described.

The connection tool 10 is formed on the side surface 10b on the side of the subsequent tunnel T2 on the side surface perpendicular to the bottom surface 10a and the cut portion 11 that opens in the longitudinal direction of the tunnel and opens on the connection waterproof sheet 5b that is the upper part. In addition, the cross section in which the water-stop bond injection hole 12 communicating with the cut portion 11 is formed is a rectangular member, and the portion 3D on the downstream tunnel side of the preceding waterproof layer 3 inside the support 4 of the downstream tunnel T2. It is erected by welding at the end of the. Specifically, the connection tool 10 is attached to the preceding waterproof layer 3 by welding the lower end portion of the side surface 10b on the trailing tunnel T2 side of the connecting tool 10 to a water-stopping iron plate that is the preceding waterproof layer 3. . A symbol Y1 in FIG. 1A is a welded portion between the preceding waterproof layer 3 and the connector 10.
An injection valve (not shown) for attaching / detaching the water stop bond injection tool 13 is attached to the water stop bond injection hole 12 of the connector 10. As shown in FIG. 2C, the number of water-stopping bond injection holes 12 may be one or plural.
The other end side of the waterproof sheet 5b for connection inserted into the cut portion 11 by inserting the water stop bond 14 into the cut portion 11 through the water stop bond injection hole 12 by the water stop bond injection tool 13. Is fixed to the notch 11.

Next, the connection method of the waterproof layer of this invention is demonstrated.
First, as shown in the left diagram of FIG. 2A, the support tunnel 1 is installed by excavating the preceding tunnel T1. Then, after concrete is sprayed on the wall, a lock bolt is driven to reinforce the wall, and then the middle wall concrete 2 as a partition is placed inside the preceding tunnel T1.
Next, as shown in the right figure of FIG. 2 (a), after a water-stopping iron plate as the preceding waterproof layer 3 is arranged on the top end side of the middle wall concrete 2, a support work is performed using a cloth formwork. Concrete (top end filling concrete 6) is filled between 1 and the preceding waterproof layer 3.
Next, as shown in FIG. 2 (b), after excavating the left and right trailing tunnel T2 and installing the supporting work 4, the rear of the supporting work 1 of the preceding tunnel T1 indicated by the thin one-dot chain line in FIG. The portion 1K inside the row tunnel T2 is removed. After that, on the inner surface side of the support tunnel 4 of the trailing tunnel T2, a trailing waterproof sheet 5a is laid on the trailing waterproof layer 5, and the bottom of the trailing tunnel T2 is excavated to place invert concrete 7. To do.
Next, as shown in FIG. 2C, the leading waterproof layer 3 and the trailing waterproof layer 5 are connected. Specifically, after welding the lower end portion of the connecting tool 10 on the trailing tunnel T2 side to the water-stopping iron plate that is the preceding waterproof layer 3, one end of the connecting waterproof sheet 5b is connected to the cut portion 11 of the connecting device 10. The one end side of the waterproof sheet 5b for connection is fixed to the connector 10 by inserting and solidifying the cut-out portion 11 with the water-stop bond 14 from the water-stop bond injection hole 12.
Since the length of the connecting waterproof sheet 5b in the tunnel longitudinal direction is generally longer than the length of the connecting tool 10 in the tunnel longitudinal direction, a plurality of connecting tools 10 are arranged in the tunnel longitudinal direction, and adjacent connecting tools are arranged. After welding 10 and the connection tool 10 and the water-stopping iron plate that is the preceding waterproof layer 3, the connection waterproofing sheet 5b is effectively fixed by fixing the connecting waterproofing sheet 5b with the water-stopping bond 14. And can be stably fixed.
The reference symbol Y1 in FIG. 2C is a welded portion between the preceding waterproof layer 3 and the connector 10, and the reference symbol Y2 is a welded portion between the connectors 10.
Finally, the other end side of the connecting waterproof sheet 5b is welded to the succeeding waterproof sheet 5a laid on the inner surface side of the supporting work 4 of the succeeding tunnel T2, so that the prevention layer of the preceding tunnel T1 and the succeeding tunnel The prevention layer of the tunnel T2 can be connected.
After the preceding waterproof layer 3 and the subsequent waterproof layer 5 are connected, the concrete wall (secondary lining concrete 8 shown on the ceiling of the subsequent tunnel T2 is indicated by the thick dashed line in the right diagram of FIG. 2B. ) Build.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the invention.

For example, in the above-described embodiment, the preceding waterproof layer 3 is a steel sheet for water stop arranged at the top end of the middle wall concrete 2, but as shown in FIG. For example, a sheet made of EVA and non-woven fabric (preceding waterproof sheet 3a) laid on the top end of the concrete 2 and a connecting iron plate attached to the trailing tunnel T2 side on the preceding waterproof sheet 3a by adhesion or the like You may comprise from 3b. In this case, the connection tool 10 is erected by welding at the end of the connecting iron plate 3b on the trailing tunnel side.
Moreover, in the said embodiment, although the trailing waterproof layer 5 was comprised from the trailing waterproof sheet 5a and the connecting waterproof sheet 5b, the connecting waterproof sheet 5b was omitted and the trailing waterproof sheet 5a The end of the preceding tunnel T1 side is inserted into the cut portion 11 of the connector 10, and the water stop bond 14 is injected into the cut portion 11 from the water stop bond injection hole 12 and solidified, so that the rear side waterproofing is performed. The sheet 5a may be fixed to the connection tool 10.

1 Support for the preceding tunnel, 2 concrete on the middle wall, 3 waterproof layer on the front side,
3a Leading side tarpaulin, 3b Connecting iron plate, 4 Back tunnel support,
5 rear side waterproof layer, 5a rear side waterproof sheet, 5b waterproof sheet for connection,
6 Top filled concrete, 7 Invert concrete, 8 Secondary lining concrete,
10 waterproof sheet connector, 10a bottom surface, 10b side surface, 11 notch,
12 Water stop bond injection hole, 13 Water stop bond injection tool, 14 Water stop bond,
T1 preceding tunnel, T2 trailing tunnel, Y1, Y2 weld.

Claims (5)

Built in the leading tunnel of the multiple tunnel, the leading waterproof layer is a waterproof layer laid on the top end of the bulkhead separating the leading and trailing tunnels, and supporting or spraying the trailing tunnel A method of connecting a subsequent waterproof layer, which is a waterproof layer laid on the inner surface side of concrete,
On the preceding waterproof sheet and the preceding waterproof sheet, the preceding waterproof sheet is a waterproofing steel plate laid on the top end side of the partition wall, or a waterproof sheet laid on the top end side of the partition wall. It consists of a mounting iron plate arranged on the trailing tunnel side,
The trailing side waterproof layer is composed of a trailing side waterproof sheet which is a waterproof sheet laid on the inner side of the supporting tunnel or shotcrete of the trailing tunnel,
Welding the lower part of the connection tool in which a cut portion opened on the trailing waterproof sheet side is formed to the trailing tunnel side of the water-stopping iron plate or mounting iron plate;
Fixing the end of the preceding tunnel side of the trailing side waterproof sheet to the cut portion with a water-stop bond; and
A method for connecting a waterproof layer, comprising: Built in the leading tunnel of the multiple tunnel, the leading waterproof layer is a waterproof layer laid on the top end of the bulkhead separating the leading and trailing tunnels, and supporting or spraying the trailing tunnel A method of connecting a subsequent waterproof layer, which is a waterproof layer laid on the inner surface side of concrete,
The preceding waterproof layer is a water-stopping iron plate laid on the top end side of the partition wall, or the preceding waterproof sheet and the preceding waterproof sheet on the leading side waterproof sheet that are waterproof sheets laid on the ceiling end side of the partition wall. It is a mounting iron plate arranged on the trailing tunnel side,
The trailing waterproof sheet is a trailing sheet that is a waterproof sheet laid on the inner side of the supporting tunnel or shotcrete of the trailing tunnel, and one end of the trailing waterproof sheet on the preceding tunnel side of the trailing waterproof sheet. It consists of a waterproof sheet for connection connected to the end,
Welding the lower part of the connection tool in which a cut portion opened on the connection waterproof sheet side is formed to the downstream tunnel side of the water-stopping iron plate or mounting iron plate;
Fixing the other end of the waterproof sheet for connection to the cut portion with a water-stop bond;
A method for connecting a waterproof layer, comprising:   The water stop bond injection hole connected to the notch part is provided in the connection tool, and the water stop bond is injected into the notch part from the water stop bond injection hole. The connection method of the waterproof layer of description. A steel plate for water stop according to any one of claims 1 to 3, or a connection tool welded to a steel plate for water stop for installation,
The connecting device is provided with a notch that opens to the rear waterproof sheet side or the connecting waterproof sheet side and stores an end of the rear tunnel sheet or the connecting waterproof sheet on the preceding tunnel side. Waterproof layer connector. 5. The waterproof layer connector according to claim 4, wherein the connector is provided with a water-stop bond injection hole communicating with the cut portion.

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