JP2674028B2 - Tarpaulin - Google Patents

Description

The present invention relates to a waterproof sheet used for civil engineering work such as tunnel construction. [Prior Art] Conventionally, it is stretched between the primary lining concrete and the secondary lining concrete of a tunnel to prevent spring water from leaking from the primary lining concrete side to the secondary lining concrete side. As a waterproof sheet, as shown in FIG. 7, a waterproof sheet having a structure in which a water-permeable sheet b such as a nonwoven fabric having the same size as the water-impermeable synthetic resin sheet a is laminated is known. [Problems to be Solved by the Invention] As shown in FIG. 8, this conventional waterproof sheet has a water-permeable sheet b on the side of the primary lining concrete c and a water-impermeable synthetic resin sheet a on the secondary side. It is arranged on the working concrete d side and stretched, and the spring water from the side of the primary lining concrete c flows down through the primary lining concrete c and the water permeable sheet b. When a waterproof sheet is stretched over the water pipe, a water conduit e such as a perforated pipe is separately provided under the waterproof sheet, and the flowing spring water flows into the water conduit e and a drain pipe connected to the water conduit e. It is discharged to the outside through f. However, the work of arranging such a water conduit is relatively troublesome, and since the water conduit must be installed separately from the work of stretching the waterproof sheet, there is a problem that the waterproofing work becomes complicated. . On the other hand, in the case of a water conduit used in a place with much sediment such as a tunnel, it is desirable that the clogging due to sediment does not easily occur. The present invention has been made to improve the above situation,
(EN) Provided is a waterproof sheet that can form a water conduit integrally with a waterproof sheet, simplify the work of arranging the water conduit, avoid complicated waterproof work, and prevent clogging of soil and sand. The purpose is to [Means for Solving Problems] In order to achieve the above object, the present invention provides a waterproof sheet comprising a water-permeable sheet laminated on one surface of a water-impermeable sheet, wherein one end or both ends in the length direction of the water-permeable sheet. The part of the water-impermeable sheet is extended outward from one end or both ends of the water-impermeable sheet, and at least the extended end of the water-permeable sheet is formed of a large number of synthetic resin having a thickness of 0.5 to 3 mm. The bodies extend from one side to the other while irregularly changing directions in the horizontal direction and the thickness direction while intersecting with each other, and a large number of these continuous linear bodies are bonded to each other at at least a part at each intersection,
In addition, the mesh length is formed by a sheet-like mesh body having a length of 2 to 20 mm, and the extending end portion is wound in a tubular shape to form a water conduit in the inner hollow portion. [Operation] Since the waterproof sheet of the present invention has one end or both ends in the length direction of the water-permeable sheet extended outward from one end or both ends in the length direction of the water-impermeable sheet, the extension thereof It is possible to use a water conduit formed by the inner hollow portion of the extending end thus rolled into a tubular shape by rolling the end portion into a tubular shape in advance or at the time of use. Therefore, according to the present invention, it is not necessary to provide a water conduit separately from the waterproof sheet, and since the water conduit can be formed integrally with the waterproof sheet, the operation of arranging the water conduit is simplified and the waterproofing work is simplified. To be done. Further, in this case, the water conduit extends from one to the other by changing the direction in the horizontal direction and the thickness direction irregularly while a number of synthetic resin linear bodies having a thickness of 0.5 to 3 mm intersect with each other. Since a large number of continuous linear bodies are bonded to each other at each intersection at least at some points, and are formed by a sheet-like mesh body having a mesh length of 2 to 20 mm, the inflow of water into the water conduit. The property is good, it does not require the trouble of perforating the pipe like a perforated pipe, and further, compared to the case of using a non-woven fabric, not only clogging of earth and sand is less likely to occur, The resistance of the water conduit to concrete pouring pressure and earth pressure can also be improved. An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. [Embodiment] FIG. 1 shows an embodiment of the present invention. A waterproof sheet 1 according to this embodiment has a long water-permeable sheet 3 laminated on one surface of a water-impermeable sheet 2. In this case, both lengthwise ends of the water-permeable sheet 3 extend outwardly from both lengthwise ends of the water-impermeable sheet 2. Here, the extending lengths of the extending end portions 4, 4 of the water permeable sheet 3 are such that when these extending end portions 4, 4 are rolled into a tubular shape, these pipe portions have a desired size as a water guiding pipe ( Diameter). The material of the water-impermeable sheet 2 is not limited, but a thermoplastic synthetic resin such as polyethylene, polypropylene, ethylene-vinyl acetate or the like is preferable. Further, as the water-permeable sheet 3, a net single-layer body or a multi-layer body made of a synthetic resin fiber can be used. That is, a large number of linear bodies change directions in the horizontal direction and the thickness direction in an irregular manner while intersecting with each other and extend from one to the other, and a large number of these continuous linear bodies form at least a part at each intersection. It is a sheet-like mesh body adhered to each other. In such a reticulated body, the thickness of the linear reticulate body is 0.5 to 3 mm, the mesh size of the sheet reticulated body is a length of 2 to 20 mm, and such a reticulated body is used. By doing so, the clogging of earth and sand is less likely to occur when the water conduit is used.
Further, if the sheet-like net-like body has a shape with moderately undulating irregularities rather than being entirely flat, water permeability is further improved when the water conduit is molded (in this case, the height h is 1 to 1). 30mm is preferable). As an example of such a sheet-like net, a plan view and a side view thereof are shown in FIGS. 2 and 3. Here, 5 is a linear body, and 6 is an intersection. Since the extending ends 4, 4 of the water permeable sheet 3 preferably have good water inflow property and shape retention when formed into a tubular shape, the water permeable sheet forming the extending ends 4, 4 is preferable. Since it is formed of a sheet-like mesh made of the above-mentioned synthetic resin linear body, there is resistance to pressing force compared to non-woven fabric,
Therefore, the resistance of the water conduit formed by this to concrete pouring pressure and earth pressure is improved. Further, in the case of forming a tubular shape, it is preferable to wind the extended end portion 2 to 3 times so as to withstand the concrete pouring pressure and the earth pressure. Further, the water-impermeable sheet 2 and the water-permeable sheet 3 are laminated by using an appropriate method such as heat adhesion or adhesion using an adhesive, and the both sheets 2 and 3 are partially or entirely bonded. be able to. As shown in FIG. 4, the above-mentioned waterproof sheet 1 has the water-permeable sheet 3 on the primary lining concrete 7 side and the water-impermeable sheet 2 on the secondary lining concrete 8 side, and these concrete 7 In this case, both extension ends 4 and 4 (only one extension end 4 is shown in FIG. 4) of the water-permeable sheet 3 are formed into a tubular shape. Part of the water is used as the water conduit 9, and the spring water flowing down in the primary lining concrete 7 and the water permeable sheet 3 flows into the water conduit 9 and then drains to the outside from a drain pipe (not shown). It is what is done. Therefore, the water conduit 9 is formed integrally with the waterproof sheet 1 in this way, and it is not necessary to separately install a water conduit, so that the waterproofing work can be easily performed and the complicated work as in the past can be avoided. it can. In this case, the above-described formation of the water conduit 9 may be carried out in advance at the same time as the production of the waterproof sheet, or at the time of using the waterproof sheet. The structure of the waterproof sheet is not limited to the embodiment shown in FIG. 1. For example, as shown in FIG. 5, the extended end portions 4 are provided at both end sides in the length direction of the impermeable sheet 2. ,
It is possible to stack two water-permeable sheets 3 and 3 in a state where the water-permeable sheet 3 is provided, and to arrange the water-impermeable sheet 2 in a non-laminated state at one middle portion of the water-impermeable sheet 2. In this case, although not shown, A large number of ridges may be provided in the middle portion of one surface of the water-impermeable sheet 2 along the length direction. Further, as shown in FIG. 6, two water-permeable sheets 3a, 3a are laminated while the extended end portions 4, 4 are provided on both sides in the one surface length direction of the water-impermeable sheet 2, and Another water-permeable sheet 3b having a different mesh roughness and material from those of the water-permeable sheets 3a, 3a may be laminated in the middle portion of one surface of the water-impermeable sheet 2. In this case, one of the water-permeable sheets 3a, 3a having the extended end portions 4, 4 can be formed of the mesh body described above, and the other water-permeable sheet 3b can be formed of an ordinary woven fabric, non-woven fabric, or the like. Further, although not shown, various modifications may be made within the scope of the present invention, such as stacking a water-permeable sheet in a corrugated shape or extending only one end in the length direction of the water-permeable sheet if necessary. Absent. As described above, according to the waterproof sheet of the present invention,
Since the water conduit can be formed integrally with the waterproof sheet at the extended end of the water permeable sheet, it is not necessary to install a water conduit separately, the work of arranging the water conduit is simplified, and waterproofing work is performed efficiently. In addition, clogging of earth and sand in the water conduit does not easily occur, and resistance to concrete pouring pressure and earth pressure can be improved. Therefore, the waterproof sheet of the present invention is very useful for waterproofing work such as tunnels.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged plan view of the water-permeable sheet of the same example with a part thereof omitted, and FIG. 3 is a water-permeable sheet of the same example. Is a partially omitted enlarged side view, FIG. 4 is a partially omitted sectional view showing a construction example of the same example, FIGS. 5 and 6 are sectional views showing other embodiments of the present invention, and FIG. FIG. 8 is a cross-sectional view of a conventional waterproof sheet, and FIG. 8 is a cross-sectional view showing a conventional construction example using the same sheet. 1 ... Waterproof sheet, 2 ... Impermeable sheet, 3,3a, 3b ... Pervious sheet, 4 ... Extended end.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kazuo Yagi               12-23 Miyamachi, Izumiotsu City, Osaka Prefecture Co., Ltd.               Tanaka (72) Inventor Tomoyuki Miyakawa               877 Komiya, Harima-cho, Kako-gun, Hyogo Prefecture               Harima Institute Co., Ltd.                (56) Reference JP-A-58-26198 (JP, A)

Claims (1)

(57) [Claims] In a waterproof sheet in which a water-permeable sheet is laminated on one surface of a water-impermeable sheet, one end or both ends in the length direction of the water-permeable sheet are extended outward from one end or both ends in the length direction of the water-impermeable sheet. Along with letting out, at least the extending end portion of the water-permeable sheet is irregularly changed in the horizontal direction and the thickness direction while a number of synthetic resin linear bodies having a thickness of 0.5 to 3 mm intersect each other. These continuous linear bodies extend from one to the other and are bonded to each other at least at a part at each intersection, and the mesh length I of the mesh is 2 to 20.
A waterproof sheet, characterized in that it is formed of a sheet-like mesh body of mm, and the extending end portion is wound in a tubular shape to form a water conduit in the inner hollow portion.