JP2978793B2 - Mounting structure and mounting method of waterproof sheet for tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly applied between a sprayed concrete surface of a ground surface and a lining concrete layer in a tunnel for waterproofing the lining concrete layer at the time of tunnel construction. The present invention relates to a mounting structure and a mounting method of a waterproof sheet.

[0002]

2. Description of the Related Art When constructing a tunnel of this type, a waterproof sheet having a predetermined width is stretched and fixed along the axial direction of the tunnel or along the circumferential direction of the tunnel on the sprayed concrete surface on the ground surface in the tunnel. Is performed, and in the process, the side edges of the adjacent waterproof sheets are joined together. In this case, in order to achieve speeding up of tunnel construction, a device for using a waterproof sheet as wide as possible has been devised.

[0003]

However, in general, a waterproof sheet is provided with a nonwoven fabric or the like on one side of a water-blocking sheet after construction, in order to discharge water leaking from the ground to the concrete surface to the side of the tunnel. A composite sheet obtained by polymerizing a water-permeable buffer layer made of water is used, and the weight per unit length of the water-stop sheet is large. Further, even when the waterproof sheet is formed of a single layer of the impermeable sheet, the weight becomes considerable. Therefore, the means for fixing the waterproof sheet to the sprayed concrete surface also needs to have sufficient strength to support the weight of the waterproof sheet, and it is necessary to efficiently stretch and fix the waterproof sheet so that it does not sag in the middle. is there. Furthermore, the sprayed concrete surface often has an uneven surface along the unevenness of the ground, but it is necessary to spread and fix the waterproof sheet as closely as possible to the uneven surface.

[0004] The present invention has been made based on the above circumstances, and can prevent the waterproof sheet from sagging when the waterproof sheet is sprayed and spread on a concrete surface.
It is another object of the present invention to provide a mounting structure and a mounting method for a water-stop sheet for a tunnel, which have sufficient strength and can hold the water-stop sheet in close contact with the uneven surface of sprayed concrete.

[0005]

Therefore, in the mounting structure of the waterproof sheet for a tunnel according to the present invention, as is apparent from the embodiment shown in FIG. In the structure in which the sheet 1 is extended and the lining concrete layer 6 constituting the inner wall of the tunnel is formed on the inner surface side of the waterproof sheet 1, the fastener 7 is attached to the sprayed concrete surface 5, and correspondingly, A fastening band 9 is attached to the outer surface of the water-stop sheet 1, and the band 9 is inserted into and engaged with an engagement hole 7 a formed in the stopper 7, and the expanded portion of the water-stop sheet 1 is sprayed. It is characterized in that it is configured to be fixedly connected to the concrete surface 5.

In this case, the stopper 7 is attached to the distal end of a long flexible mounting member 8 having a base attached to the outer surface of the water-stop sheet 1, and the band 9 is attached to the water-stop sheet 1 following it. A base is attached to the outer surface of the watertight sheet 1. In the process of expanding the water-stop sheet 1, the stopper 7 is first fixed to the concrete surface 5 by spraying with a nail or the like, and a band 9 is formed on the stopper 7. It can be configured so as to be inserted into and engaged with the engaging hole 7a thus formed and to tension the extended portion of the water-stop sheet 1. That is, the band 9 is formed with the engaging hole 7 formed in the stopper 7.
When inserting into a, the insertion is permitted, and the retaining engagement is made in the reverse direction. For this purpose, an engaging portion 9a made of saw-toothed irregularities is formed on the front or back surface of the band 9, and the band 9 is pulled into the engaging hole 7a. The hook portion 7b of the unevenness or the outlet is fixed by being engaged with the hook portion 7b.

In the method for mounting a waterproof sheet for a tunnel according to the present invention, as shown in the embodiment of FIG.
When the water-stopping sheet 1 is spread on the ground-side sprayed concrete surface 5 in the inside, a stopper 7 previously attached to the water-stopping sheet 1 is firstly fixed to the sprayed concrete surface 5 by nailing or the like. An engaging hole 7a formed in a stopper 7 with a fastening band 9 attached to a subsequent portion of the water sheet 1.
, So that the stretched portion of the waterproof sheet 1 is tensioned and fixed.

With such a configuration, when the stopper 7 is sprayed and fixed to the concrete surface 5 in the process of spreading the waterproof sheet 1, even if the spreading of the waterproof sheet 1 is loosened, the subsequent fastening is performed. The tension of the band 9 is used to release the looseness,
The waterproof sheet 1 can be securely and easily and firmly extended and fixed. As shown in FIG. 3, a position determined by fitting a stopper 7 at the tip of a long flexible mounting member 8 having a base fixed to the outer surface of the water blocking sheet 1 to the unevenness of the sprayed concrete surface 5, for example, sprayed concrete The band 9 is fastened and fixed in the recess of the surface 5 by nailing or the like, and the band 9 is inserted into the engaging hole 7a of the stopper 7 and pulled long.
If the base is attached so as to be close to the stopper 7, the band 9 is tensioned, so that the middle part of the waterproof sheet 1 is stretched and fixed in a state where the unevenness of the sprayed concrete surface 5 is adjusted. Can be done.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Embodiment 1 of a mounting structure and a mounting method of a waterproof sheet for tunnel according to the present invention will be specifically described below with reference to FIGS. The water-blocking sheet 1 employed in this mounting structure and mounting method has a water-permeable sheet 2 made of a soft synthetic resin or an elastomer, and a water-permeable buffer layer 3 made of a raised layer such as a loop or a non-woven fabric layer. This is the configuration. It is also possible to use the above-mentioned waterproof sheet 2 having a single layer as the waterproof sheet 1.

[0010] In this tunnel construction, the waterproof sheet 1 is attached to the sprayed concrete surface 5 on the ground surface in the tunnel 4 with the water buffer layer 3 side being the ground side,
Basically, the lining concrete layer 6 is formed on the water-impervious sheet 2 side. In addition, depending on construction conditions, it is also possible to attach an independent water-permeable buffer layer 3 to the sprayed concrete surface 5 in advance, and to attach a single-layer waterproof sheet only to the water-blocking sheet 2 from the surface.

The first embodiment of the present invention is applied to the construction of a tunnel when the waterproof sheet 1 is extended in the tunnel axial direction. Here, as shown in FIGS. 1 and 2, first, the waterproof sheet 1 is attached to the sprayed concrete surface 5 on the ground surface in the tunnel 4, and the lining concrete is formed inside the tunnel through the waterproof sheet 1. In the structure of the tunnel forming the layer 6, at least the tunnel 4
4a, 4b, 4c divided in the direction of the peripheral wall of
Then, a plurality (three in this embodiment) of water-stop sheets 1 are spread on the sprayed concrete surface 5 in the longitudinal direction of the tunnel 4 so that the side edges 1a overlap each other.
In this case, the stretched and fixed area of the water-stop sheet 1 is preferably divided at least into the ceiling of the tunnel 4 and the left and right side walls, and the water-stop sheet 1 in each of the areas 4a, 4b, 4c. Is mounted on the ceiling-side water-stop sheet 1 with its side edge 1a overlapped so that the water-stop sheet 1 on the side wall side is inside the tunnel. In addition, waterproof sheet 1
Is wound in a roll shape in order to secure a sufficient length extending in the tunnel axial direction, and is guided toward and near the sprayed concrete surface 5 by the guide roller 11. The roll 1A of the water-stop sheet 1 and the guide roller 11 are provided on a carriage that moves in the axial direction in the tunnel, and can be rolled up and extended with the movement of the carriage.

The base of a long flexible mounting member 8 with a stopper 7 is attached to the water-stop sheet 1 at a predetermined interval in the direction of its extension by fixing or engaging. At the position following in the direction, the base of the band 9 for fastening is likewise mounted. And water stop sheet 1
In the process of stretching, prior to the stretched portion of the waterproof sheet 1,
The fastener 7 is fixed to the sprayed concrete surface 5 by a fastener 10 such as nailing, and the band 9 is inserted into and engaged with the engagement hole 7a formed through the fastener 7 in the extending direction. The stretched portion of the seat 1 is fixed in tension.

Next, a specific example of a fixing structure and a method using the stopper 7 and the band 9 will be described with reference to FIGS. 4 and 5. FIG. The stopper 7 is formed of a hard plastic or metal, and is fixed to the distal end of the long flexible mounting member 8. The stopper 7 has an engaging hole 7a formed therethrough in the direction in which the water-stop sheet 1 extends, and a fixing tool 10 such as a concrete nail when the stopper 7 is fixed to the sprayed concrete surface 5. Is formed. The long flexible mounting member 8 is formed of a band or string such as a nonwoven fabric or a nylon strap.
Further, the band 9 is formed of a band-like body such as a nylon strap, and the base of the band 9 is previously joined to the waterproof sheet 1 with sufficient strength. In particular, in this embodiment, a saw-toothed engaging portion 9a is formed in one of the front and back surfaces or both surfaces in the longitudinal direction. In addition, the engagement hole 7 of the stopper 7
On the inner surface (FIG. 3) or the outlet portion (FIG. 4) of a, a hook portion 7b having a saw-toothed or step-like shape is provided to engage with the engaging portion 9a. The engaging portion 9a and the hook portion 7b are shaped so as to allow insertion in the insertion direction of the band 9 and stop and prevent the band 9 from coming out in the opposite direction.

The fixing method using the stopper 7 and the band 9 is the same as that of the water-stop sheet 1
Flexible mounting member 8 protruding from the back of the device by a reference dimension
Spray the stopper 7 at the tip and fix it to the concrete surface 5
Nail and fix with 0. Next, the band 9 is passed through the engaging portion 9a of the stopper 7 and tightened. Since the base of the band 9 fixed to the water buffer layer 3 is held and fixed at a minimum distance to the fastener 7 nailed and fixed to the sprayed concrete surface 5, as shown in FIG. Even when the surface of the water-stop sheet 1 had irregularities, the thickness of the middle part of the water-stop sheet 1 was minimized and fixed to the concrete surface 5.

(Second Embodiment) FIG. 6 is a diagram showing a second embodiment. In the second embodiment, each of the waterproof sheets 1 having a length corresponding to the circumferential length of the tunnel is mounted in an arch shape along the circumferential direction of the tunnel, and sequentially along the tunnel axial direction as the construction proceeds. The adjacent water-stop sheets 1 are attached or adhered in a state in which both side edges thereof are welded or slightly polymerized.

In the second embodiment, the first embodiment is used.
The waterstop sheet 1 is stretched and fixed by means of the stopper 7 and the band 9 at the distal end of the flexible mounting member 8 similar to the above. At this time, for example, the process can be performed at least in a range of 120 degrees at the top of the tunnel ceiling (upward and rightward 60 degrees around the intersection of the tunnel center line CL and the spring line SL).

[0017]

As described in detail above, the present invention has been described in detail, and the fixing of the waterproofing sheet to the sprayed concrete surface is achieved by fastening the stoppers during the expansion and inserting the tightening band into the stoppers. By the engagement, an excellent effect is obtained in that the tension can be reliably and firmly achieved in a tensioned state.

In this case, the middle portion of the water-stop sheet 1 is bent by bending the long flexible mounting member 8 to fix the stopper 7 at the tip end in the uneven surface of the concrete and strongly pulling the band 9. It can be stretched and fixed almost in close contact with the uneven surface of sprayed concrete.

Furthermore, according to such construction, since it is not necessary to penetrate the water-stop sheet with a nail, waterproofness is secured, and the tunnel construction is superior to the conventional construction method by several steps. Becomes

[Brief description of the drawings]

FIG. 1 is a partially sectioned perspective view showing a tunnel structure according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a spreading step.

FIG. 3 is an enlarged cross-sectional view of a main part of another portion showing a spreading step.

FIG. 4 is a side sectional view and a front view showing a first example of a stopper and a band used in the first embodiment.

FIG. 5 is a side sectional view and a front view showing a second example of the stopper and the band used in the first embodiment.

FIG. 6 is a partially sectional perspective view showing a tunnel structure according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Water-stop sheet, 1A roll 2 Water-blocking sheet 3 Water-permeable buffer layer 4 Tunnel 5 Sprayed concrete surface 6 Lining concrete layer 7 Stopper, 7a Engagement hole, 7b Hook, 7
c Stop hole 8 Flexible mounting member 9 Band, 9a Engagement part 10 Fixture 11 Guide roller

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Isao Kodama 1-18-1 Kyobashi, Chuo-ku, Tokyo Inside C-I Kasei Co., Ltd. (56) References JP-A-2-49900 (JP, A) JP-A-Hei 5-156897 (JP, A) JP-A-8-13994 (JP, A) JP-A 54-50436 (JP, U) JP-A 60-162199 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 11/38

Claims (3)

(57) [Claims] 1. A structure in which a waterproof sheet is spread on a sprayed concrete surface in a tunnel, and a lining concrete layer constituting an inner wall of the tunnel is formed on an inner surface side of the waterproof sheet. Put on,
In addition, a band for tightening is attached to the outer surface of the water-stop sheet correspondingly, the band is inserted into and engaged with an engagement hole formed in the stopper, and the extended portion of the water-stop sheet is inserted into the engagement hole. An installation structure for a waterproof sheet for a tunnel, wherein the structure is configured to be fixedly connected to a sprayed concrete surface. 2. The stopper is attached to a distal end of a longitudinal flexible mounting member having a base attached to an outer surface of the water-stop sheet, and the band is attached to an outer surface of a water-stop sheet subsequent thereto. In the process of expanding the waterproof sheet, the stopper is fixedly fastened to the sprayed concrete surface in advance, and the band is inserted and engaged with the engaging hole formed in the stopper. 2. The mounting structure for a waterproof sheet for a tunnel according to claim 1, wherein the stretched portion of the waterproof sheet is fixed or tensioned. 3. When the water-stop sheet is spread on the ground-side sprayed concrete surface in the tunnel, a stopper previously attached to the water-stop sheet is fixed prior to the sprayed concrete surface, and the water-stop sheet is fixed. By inserting a fastening band attached to a subsequent portion into an engagement hole formed in the stopper and engaging the same, the extended portion of the water-stop sheet is fixed or tensioned. How to attach the waterproof sheet.