JPH0594399U - Tarpaulin extension structure - Google Patents

Abstract

(57) [Summary] (Modified) [Configuration] By connecting one side edge of the first impermeable sheet 1a and one side edge of the second impermeable sheet 2a continuously. These two sheets are connected to each other, and the third water-impermeable sheet 3a is heat-bonded to the connection sheet S across one side edge portion to thereby connect the connection sheet S.
In the stretched structure of the waterproof sheet, which is formed by connecting the third impermeable sheet 3a to the above, one side edge of the one side edge portion of the connection sheet S facing the third impermeable sheet 3a. The portion is formed so as to gradually become thinner from a position separated from the edge by a predetermined distance toward the edge, and a step is formed at one side edge of the connection sheet that is heat-bonded to the third impermeable sheet 3a. Lost. [Effects] Complete joining can be obtained without producing unjoined voids in the double joined portion, and the waterproof sheets can be joined and stretched without causing the possibility of water leakage.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for tensioning a waterproof sheet on the ground of a tunnel or concrete for primary lining.

[0002]

[Prior Art]

 Conventionally, in tunnel construction, in order to prevent the spring water from the ground side from leaking to the secondary lining concrete side, a waterproof sheet has been installed on the ground or primary lining concrete. In this case, the waterproof sheet consists of a thermo-adhesive synthetic resin impermeable sheet of the waterproof sheet which is sequentially heat-bonded in the circumferential direction of toluene, and the heat-bonded portion is completely joined. If this is not done, water will leak from it, so it is required to completely and reliably heat-bond adjacent tarpaulins.

By the way, when the waterproof sheets are bonded and stretched by thermal adhesion as described above, as shown in FIGS. 3 and 4, the impermeable sheet 1a and the second waterproof sheet 1a of the first waterproof sheet 1 are used. With respect to the connection sheet S in which one side edge portions of the waterproof sheet 2 and the water-impermeable sheet 2a are respectively heat-bonded to each other or joined by an adhesive, the one side edge portion is traversed, and in a direction perpendicular to this In some cases, the water-impermeable sheet 3a of the third waterproof sheet 3 may be thermally adhered and joined along with it. In the figure, 1b, 2b and 3b are water-permeable cushioning materials for the respective waterproof sheets 1, 2 and 3 (however, 1b is not shown). A is the ground or the primary lining concrete side.

[0004]

[Problems to be solved by the device]

 However, in the joining mode of the third waterproof sheet 3 as shown in the figure, the water impermeable sheet of the first waterproof sheet 1 which is opposed to the water impermeable sheet 3a of the third waterproof sheet 3 and is thermally bonded thereto. Since one side edge 4 of the water-permeable sheet 1a is angular, the end surface 5 of the water-impermeable sheet 1a is not thermally bonded to the third water-impermeable sheet 3a, and the unbonded void portion 6 is formed in this portion. Occurs.

That is, when the water-impermeable sheets are heat-bonded to each other, a hot-gote-type welding machine or a hot-air type welding machine is generally used. Since the end surface 5 of the first impermeable sheet 1a does not come into close contact with the third impermeable sheet 3a when forming the heavy-bonded portion, the unbonded void portion 6 is generated as described above. There was a risk that water would leak from the location where the heavy joint was formed.

The present invention has been made in order to improve the above-mentioned circumstances, and it is possible to form a completely reliable joint without generating an unjoined void portion in the double joint portion, and thus, without a possibility of causing water leakage from this portion. It is an object of the present invention to provide a waterproof sheet tensioning structure.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a plurality of water-proof sheets having a water-impermeable sheet formed of a heat-adhesive synthetic resin on the ground or primary lining concrete of a tunnel. A structure in which a permeable sheet is connected and stretched by joining, and one side edge of the first impermeable sheet and one side edge of the second impermeable sheet are continuously joined. These sheets are connected to each other, and the third water-impermeable sheet is heat-bonded to the connection sheet across the one side edge portion, whereby the third water-impermeable sheet is attached to the connection sheet. In the stretched structure of the waterproof sheet, the one side edge of the one side edge of the connection sheet facing the third impermeable sheet is predetermined as the edge. As you move from the spaced position to the edge, Formed to be the next thin, it provides a tensioning structure of a waterproof sheet, characterized in that it eliminates the step on one side edge portion of the connecting sheet which is adhered a third impermeable sheet and heat.

[0008]

[Action]

 According to the stretched structure of the waterproof sheet of the present invention, the one side edge of the one side edge of the connection sheet facing the third impermeable sheet is separated from the edge by a predetermined distance. By forming it so that it gradually becomes thinner from the position toward the edge, and eliminating the step at one side edge of the connection sheet that is heat-bonded to the third impermeable sheet, for example In the case of performing thermal bonding using a fusion welding machine, since the tip of the heat iron advances along the shape of the thin wall surface (tilted end surface), the third impermeable sheet is attached to this thin surface (tilted end surface). Are completely bonded, and no unbonded void is formed there. The same applies when heat bonding is performed with hot air.

Therefore, the joint at the double joint is perfect, and there is no risk of water leakage from the double joint.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, the same components as those in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted.

In the illustrated embodiment, in the connection sheet S in which the first waterproof sheet 1 and the second waterproof sheet 2 are connected, one side edge of the connection sheet S is the impermeable sheet of the third waterproof sheet 3. The one side edge portion 4 of the water-impermeable sheet 1a of the first waterproof sheet 1 facing the side 3a is formed so as to become gradually thinner from a position spaced from the edge by a predetermined distance toward the edge. The inclined end surface 5 is thus formed, and the step is eliminated.

Here, the inclined end surface 5 can be formed, for example, by cutting the above-mentioned one side edge into a slant, and this can be achieved by cutting with a cutter, fusing with heat, or using a grinder such as a router. It can be done by grinding.

The water-impermeable sheet may be a synthetic resin having thermal adhesiveness, and for example, a polyethylene sheet, an ethylene-vinyl acetate copolymer sheet or the like is used.

The third impermeable sheet 3a is heat-bonded to the first impermeable sheet 1a having the inclined end surface 5 and having no step at the one side edge portion 4. In this case, the heat welding or hot air can proceed along the shape of the slanted end face 5 in the heat welding, so that the third impermeable sheet 3a is surely heat-bonded to the entire slanted end face 5. Therefore, an unjoined portion does not occur at the one side edge portion 4 of the first water-impermeable sheet 1a, and a joining structure in which there is no risk of water leakage at this double-joined portion can be obtained.

The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the present invention, for example, the provision of a water-permeable cushioning material can be omitted.

[0016]

[Effect of the device]

 According to the present invention, when the third impermeable sheet is further heat-bonded across the joint between the first impermeable sheet and the second impermeable sheet, the double joint is not yet bonded. Complete joining can be obtained without producing a joining void portion, and therefore, even if there is such a double joining portion, the waterproof sheets can be joined and stretched without causing the possibility of water leakage from this portion.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a double joint portion of the same embodiment.

FIG. 3 is a schematic perspective view showing a conventional waterproof sheet disposition structure.

FIG. 4 is an enlarged cross-sectional view of a double joint portion of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st waterproof sheet 1a Impermeable sheet of 1st waterproof sheet 2 2nd waterproof sheet 2a Impermeable sheet of 2nd waterproof sheet 3 3rd waterproof sheet 3a Impermeable of 3rd waterproof sheet Sheet 4 Side edge 5 End surface S Connection sheet A Ground or primary lining concrete side

Claims (1)

[Scope of utility model registration request] 1. A plurality of waterproof sheets having a water-impermeable sheet formed of a heat-adhesive synthetic resin are connected to the ground of the tunnel or the primary lining concrete by joining the water-impermeable sheets. And a structure in which one side edge of the first impermeable sheet (1a) and one side edge of the second impermeable sheet (2a) are continuously joined. These sheets are connected to each other by means of which the third water impermeable sheet (3a) is thermally bonded across the one side edge portion to the connection sheet (S), whereby the connection sheet (S) is formed. ) To the third impermeable sheet (3
a) a stretched structure of a waterproof sheet, in which a) is connected, one side edge of one side edge of the connection sheet (S) facing the third impermeable sheet (3a) Is formed on the side edge of one side of the connection sheet that is heat-bonded to the third impermeable sheet (3a) by gradually forming a thin wall from a position separated from the edge by a predetermined distance toward the edge. A stretched structure of a waterproof sheet characterized by eliminating steps.