JP2784838B2 - Water stop segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a watertight technology for a shield tunnel in which a vertical shaft is continuously constructed from a shaft, and more particularly to a watertight segment provided with an entras packing.

<Conventional Technology> As shown in FIG. 4, the applicant of the present invention has previously proposed a construction method capable of continuously constructing a shaft A from a shaft B.

This construction method will be briefly described. A shield excavator having a structure in which a horizontal shaft shield machine b is rotatably built in a tubular shaft shield machine a is used, and a shaft shaft is mounted while the horizontal shaft shield machine b is built. A is constructed, and only the horizontal shaft shield machine b is rotated by 90 ° at the deepest part of the vertical shaft A, and the horizontal shaft shield machine b is excavated with the shaft body of the vertical shaft shield machine a as a starting base, and the shaft 4 and the horizontal shaft are excavated. This is a method of continuously constructing the pit B.

By the way, when starting the horizontal shaft shield machine b, the packing c between the spherical portion of the vertical shaft shield machine a and the start end of the horizontal shaft B
It is important from the viewpoint of construction that water is stopped by interposing the shaft, but the segments constituting the horizontal shaft B protrude in the vertical shaft shield machine a, and the inner space of the vertical shaft A becomes narrow.

Therefore, in order to utilize the inner space of shaft A widely,
It is sufficient to stop the water at the position d after the construction.

To stop the water at the position d, the following water stopping methods are conceivable, but all have the following disadvantages.

<B> Either use a segment in which a sealing material such as rubber packing or a brush is incorporated in advance on the outer peripheral surface of the segment at the position where water is to be stopped constituting the horizontal shaft B, or make a gasket protrude outward between the segments. It is conceivable that they are sandwiched in a state where they are held.

However, since all of them are assembled in the shield machine, there is a limit in the followability to a gap (tail void) generated after the shield machine passes, and a sufficient pressing force cannot be secured.

 Therefore, the water stopping performance is low.

<B> A method of stopping water by attaching a sealing material that expands and contracts by supplying and discharging fluid pressure is provided on the outer peripheral surface of the segment at the position where water is to be stopped.

In the case of this method, since the tube expands in the gap direction, it is difficult to cope with high water pressure, and the problem of sustaining the water stopping effect remains.

<Object of the present invention> The present invention has been made in view of the above points, and an object of the present invention is to provide a water-blocking segment having a simple structure and a high water-blocking effect.

<Means for Solving the Problems> That is, the present invention divides the annular body into a plurality of parts, a main body having a concave groove on the outer peripheral surface, and a rigid split ring housed in the outer peripheral surface of each main body so as to be able to freely enter and exit. It is characterized by being constituted by an endless elastic telescopic packing having an endless shape for covering the outer periphery of the ring assembled in a ring shape, and capable of extruding the entras packing together with each split ring with a rod from the inside of the main body.

<Description of the Present Invention> Hereinafter, the present invention will be described with reference to the drawings.

<A> Waterproof segment FIG. 1 shows a vertical sectional view of the waterproof segment 2 assembled inside the tail part 1 of the shield machine.

The water-stop segment 2 includes a main body 4 thinner than the normal segment 3, a split ring 5 provided on the outer periphery of the main body 4 so as to be able to move in and out, and an endless entras packing 6 covering the split ring 5. I do.

 Hereinafter, each part will be described in detail.

<B> Main Body The arc-shaped main body 4 is made of steel or concrete, has a circumferentially continuous concave groove 41 on its outer periphery, and has a through hole 42 in a part of the bottom surface of the concave groove 41.

In addition, the main body 4 has bolt boxes at a plurality of locations on the inner peripheral edge for connection with the segment 3.

On the opposing side surfaces of the concave groove 41, sealing materials 43 and 44 are continuously provided, and the thickness of both sealing materials 43 and 44 is
The thickness increases as the distance from the bottom surface increases.

This is to ensure high water-stop between the protruding entruss packing 6 and the sealing members 43 and 44 as described later.

One seal member 43 can be attached at the time of manufacturing the main body 4, while the other seal member 44 is attached using a bolt 45 at the time of assembling the water blocking segment 2.

In addition, a plurality of bolt boxes for connecting between the segments 3 and between the main bodies 4 are provided at a plurality of locations on the inner peripheral portion of the main body 4.

<C> Split Ring The split ring 5 is a rigid arc-shaped body having a tapered cross section.

The projecting amount of the concave groove 41 can be adjusted by rotating the pressing bolt 51 screwed into the through hole 42 of the main body 4 of the split ring 5.

<D> Entras packing The entras packing 6 has a semicircular cross section and is made of hard rubber or the like having a large elongation.

The split ring 5 is adhered to the inside of the entruss packing 6 when the water blocking segment 2 is assembled. At this time, the gap 8 is secured without bonding between the split ring 5 and the top of the entras packing 6.

The gap 8 is useful for eliminating manufacturing tolerances and construction errors.

Further, as shown in FIG. 3, the projection length of the entruss packing 4 is slightly larger than the expected distance between the shaft structure (the shaft shield a in FIG. 4) and the peripheral surface of the horizontal shaft B. Set to large dimensions.

<Operation> Next, the construction method will be described.

In this embodiment, the water-stop segment 2 is located at the position d in FIG.
Will be described.

<A> Assembling of the water stop segment At the time of the construction of the horizontal shaft B, the water stop segment 2 is assembled at the position d which is the planned water stop position.

That is, as shown in FIG. 1, the water blocking segment 2 is assembled inside the tail portion 1 of the shield machine b.

To assemble the water stopping segment 2, the split ring 5 is sequentially inserted between the concave groove 41 of the divided main body 4 and the entraseal packing 6, and at the same time, the water stopping process is performed, and the sealing material 44 is mounted on the side surface of the concave groove 41. .

<B> Assembly of horizontal shaft When the assembly of the water stop segment 2 is completed, the horizontal shaft B is constructed using the ordinary segment 3, as shown in FIG.

<C> Movement of the water stop position When the construction of the horizontal shaft B is completed, the push bolts 51 of the respective main bodies 4 of the water stop segments 2 are screwed in as shown in FIG. Protrude evenly.

The protruding tip of the entruss packing 6 comes into pressure contact with the shaft structure (the shaft shield a in FIG. 4), so that water can be stopped between them.

When the split ring 5 protrudes, both hem portions of the entraseal packing 6 are in close contact with the thick portions of the seal materials 43 and 44, so that water can be stopped between the seal materials 43 and 44 and the entraseal gasket 6 at the same time.

<Effects of the Present Invention> The present invention has the following effects.

<A> The amount of projection of the entras packing from the inside of the segment can be freely adjusted, and there is no fear that the pressing force of the entras packing escapes in the lateral direction, so that high waterproofness can be secured.

<B> Excellent adaptability when the void is large.

<C> Since all parts except the entras packing are composed of divided bodies, transportation, on-site production and on-site assembly are easy.

<D> The duration of the water stopping effect can be greatly extended.

[Brief description of the drawings]

Fig. 1: Cross-sectional view in the longitudinal direction of the tunnel before the water-stop segment according to the present invention bulges Fig. 2: Assembly view of the water-stop segment Fig. 3: Cross-sectional view in the vertical direction of the tunnel after the water stop segment bulges Fig. 4: Illustration of the base technology of the present invention

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshihiko Bessho Toshihiko 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Tadao Hirayo 1-25, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 1 Taisei Construction Co., Ltd. (72) Inventor Hiroyuki Ito 13-13 Showa-cho, Minato-ku, Nagoya-shi, Aichi Prefecture Ishikawa-Shima Harima Heavy Industries, Ltd. Nagoya Plant (72) Inventor Toshiaki Uehara 13, Showa-cho, Minato-ku, Nagoya-shi, Aichi Address: Nagoya Plant, Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Hirohide Hashimoto 2-6-21, Yaesu, Chuo-ku, Tokyo Rose Bay Yaesu Building Ishikawajima Building Materials Co., Ltd. (72) Inventor: Haruhiko Takayama Tokyo 2-6-21, Yaeshu, Chuo-ku Loose Bay Yaeshu Building Inside Ishikawajima Kenzai Kogyo Co., Ltd. (56) References JP-A-2-225798 (JP A) (58) investigated the field (Int.Cl. ^6, DB name) E21D 11/04 E21D 11/08 E21D 9/06 301

Claims (3)

(57) [Claims] An annular body is divided into a plurality of parts, a main body having a concave groove on the outer peripheral surface, a rigid split ring housed in the outer peripheral surface of each main body so as to be able to freely enter and exit, and an outer periphery of the annularly assembled split ring. A water-stop segment comprising an endless-shaped telescopic packing having an endless shape covering the endless packing, wherein the rod-shaped body is capable of extruding the entras packing together with each split ring from the inside of the main body. 2. A sealing material according to claim 1, wherein the split ring is formed to have a tapered cross-section, and has a thick portion which can be pressed against the skirt of the entras packing on both opposing side surfaces in the receiving groove. A water-stop segment, characterized by being fitted with a. 3. The water-stop segment according to claim 1, wherein a gap is formed between the top of the split ring and the top of the entruss packing to fix them.