JPH04262000A - Constructing method of waterproof sheet in tunnel - Google Patents

Abstract

PURPOSE:To avoid the thinning and breakdowns of waterproof sheets due to vertical elongation by gravity and to ensure reliable seal in the construction of heat seal type wafterproof sheets for tunnel, and to seal waterproof sheets in tunnel arch portion reliably too. CONSTITUTION:When heat seal type waterproof sheets 4 are heat sealed to waterproof sheet attaching members 1 provided on the tunnel surface to be covered primarily, the waterproof sheets are overlapped on the attaching members through specified heating wires 5 of special extended shape. A current is flowed in the heating wires to heat-seal the waterproof sheets to the attaching members.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for constructing a waterproof sheet for tunnels, and more specifically, a method for constructing a waterproof sheet for tunnels, and more specifically, a method for applying a waterproof sheet as a waterproofing work using a heat-welding disk to the primary lining surface of a tunnel. The present invention relates to a method for constructing a tarpaulin sheet for a tunnel, and a method for constructing a tarpaulin sheet for a tunnel, in which a heat-weldable repair tarpaulin sheet is heat-welded to damaged parts of the heat-weldable tarpaulin sheet applied to the primary lining surface of the tunnel.

0002

[Prior Art] Conventionally, a method for constructing a tunnel waterproof sheet with such specifications involves attaching a waterproof sheet to an object such as a heat-weld disc on the tunnel primary lining surface, and a waterproof sheet to be heat-welded to this object. There is a known construction method in which the waterproof sheet is stretched by melting it with hot air or an electric heating iron and pressing the waterproof sheet against the object to which the waterproof sheet is attached, such as a disk. Welding of tarpaulins with hot air is sufficient for heating the tarpaulin itself, but the hot air is often blown onto the tarpaulin beyond the area to be welded. As a result, unnecessary portions of the waterproof sheet may be thermally melted, and those portions may be stretched downward by the weight of the sheet, resulting in thinning or damage. When welding a tarpaulin sheet with an electric heating iron, hot air will not heat-fuse an extra wide area of the tarpaulin sheet, but the heating of the tarpaulin sheet is likely to be insufficient, often resulting in poor welding.

0003

[Problems to be Solved by the Invention] The problems to be solved are that the waterproof sheet can be thermally melted in the minimum necessary area, and that it is possible to avoid drooping, thinning and damage due to the weight of the waterproof sheet, and to make it waterproof. The goal lies in the development of the ability to heat the sheets sufficiently and successfully to ensure good welding.

A further object of the present invention is to ensure good welding for the waterproof sheet of the tunnel arch.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a heat-welding disk on a primary lining surface of a tunnel, on a required surface, in an extending manner in a direction around the center of the disk. Alternatively, the specifications include applying or attaching heating wires forming a zigzag shape in the diameter direction, overlaying a heat-welding waterproof sheet over the heating wires, energizing the heating wires, and pressing the waterproof sheet against the disc, and the primary covering of the tunnel. A heat-weldable waterproof sheet for repair is overlaid on the partially damaged part of the heat-weldable waterproof sheet stretched over the construction surface, with a heating wire having the same extension as above, and the heating wire is energized to waterproof the former. It is characterized by the specification of pressing the latter tarpaulin sheet onto the sheet.

[0006]

[Function] As described above, in the present invention, the heat-weldable waterproof sheet stretched between the heat-weldable disc on the tunnel primary lining surface and the heat-welded waterproof sheet layered thereon, or on the tunnel primary lining surface. Under the specifications that a heating wire is interposed between the partially damaged area and the repair heat-sealable tarpaulin sheet overlaid on it, and electricity is applied to it, heat-sealable discs and waterproof sheets or existing waterproof sheets and Since the repair tarpaulin sheet is heated, the tarpaulin sheet can be thermally welded to the minimum necessary area. Further, by appropriately setting the calorific value of the heating wire and/or the energization time in terms of design, the waterproof sheet can be sufficiently and effectively heated.

Thus, according to the present invention, it is possible to avoid drooping, thinning and damage due to the weight of the waterproof sheet, and also ensure good welding of the waterproof sheet.

Furthermore, in the present invention, the heating wire interposed between the heat-welding disc on the tunnel primary lining surface and the waterproof sheet to be installed, or between the already installed waterproof sheet and the waterproof sheet for repair, has its extension. Since the heating wire is placed in a zigzag shape in the direction around the center of the disk or in the diametrical direction, or in a similar extending manner, the heating wire is Despite the fact that the thermal welding of the waterproof sheet is performed linearly, which means that the peel strength is weak, good welding is also guaranteed for the waterproof sheet of the tunnel arch.

[0009] When thermally welding a heat-fusible disc or a heat-fusible waterproof sheet to a heat-fusible waterproof sheet with the intervention of a heating wire, the actual success of the heat welding is that the two materials being heat-welded are compatible with each other. This is about the linear portion of the contacting interface adjacent to the heating wire. Regarding the peripheral surface of the heating wire corresponding to other parts, although the disc or sheet in that part is thermally melted, it is isolated by the heating wire, that is, it does not function as a welding material by thermal melting under mutual contact. Not heat welded.

[0010] The above-mentioned extension mode of the heating wire according to the present invention is such that the heating wire extends in the radial direction of the heat-fusible disc or the surface of a portion corresponding thereto, in the radial direction of the disc or in a direction equivalent thereto. covers a wide area. In other words, the directionality of the heat-welded wire of the waterproof sheet using the heating wire according to the present invention is mostly in the disk radial direction or a direction corresponding thereto. The direction in which the waterproof sheet thermal welding line is applied is convenient because during thermal welding, a load is applied to the waterproof sheet in the disk radial direction or a direction corresponding thereto due to drooping due to weight. That is, the directionality of the weld lines helps at least several weld lines simultaneously and linearly perform a peeling-resistant function against drooping due to the weight of the waterproof sheet, and good peeling resistance can be obtained.

Therefore, according to the present invention, good welding of the waterproof sheet of the tunnel arch portion with the heating wire is ensured.

0012

Embodiments Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view showing the procedure for constructing a waterproof sheet according to the present invention. FIG. 2 is a sectional view showing how to apply a repair waterproof sheet to a damaged part of an already installed waterproof sheet according to the present invention. FIG. 3 is an illustrative diagram of a power supply device for a heating wire for a heat-welding disc attached to a tunnel primary lining surface in a region corresponding to a region other than the edge of a waterproof sheet using the method of the present invention; FIGS. 6 are illustrations of heating wire extension modes different from those shown in FIG. 3, and FIG. 6 shows heating wires for a heat-fusible disc attached to the tunnel primary lining surface at a portion corresponding to the edge area of the waterproof sheet. FIG.

Reference numeral 1 denotes a heat-fusible disc 1 as an object to which a waterproof sheet is attached, and the heat-fusible disc 1 may be attached to the tunnel primary lining surface 3 by a method known per se, for example, by driving two nails. 4 indicates a heat-fusible waterproof sheet.

Reference numeral 5 denotes a heating wire, and the heating wire 5 extends in a manner that corresponds to the surface to be welded of the disc 1 or the waterproof sheet 4.
A zigzag shape as shown in FIG. 3 in the direction around the center of the surface, or a zigzag shape as shown in FIG. 4 or 5 in the diametrical direction, or a substantially similar extension. Appropriate the aspect.

[0015] The disc 1 is attached to the tunnel primary lining surface in an area that is not near the edge of the heat-weldable waterproof sheet 4 to be heat-welded, that is, an area that is out of reach of the waterproof sheet construction worker. 3, the heating wire 5 is attached to the surface of the disc 1 to which the waterproof sheet 4 is to be thermally welded, prior to the installation of the waterproof sheet 4, or before the installation of the disc 1 to the tunnel primary lining surface 3, or Attach it after installation. To attach the heating wire 5 to the disk 1, it is advantageous to use adhesive or adhesive tape. The heating wire 5 may be attached to the disc 1 in a state where it is about half buried. A method of partially filling the disc 1 with the heating wire 5 by applying electricity to the heating wire 5 can be advantageously applied.

When the disc 1 is attached to the tunnel primary lining surface 3 near the end of the heat-weldable waterproof sheet 4 that is heat-welded to it, that is, in an area within the reach of the waterproof sheet installation worker, the electric The desired end of the heating wire 5 is held between the clip-type power supply terminals 7, 7 of a hand-held power supply device 6 as shown in FIG. All you have to do is apply it to the required surface of the disc 1. Alternatively, in the same way as described above for the disc 1 arranged on the tunnel primary lining surface 3 in the area corresponding to the area not near the edge of the tarpaulin sheet 4, heating wires can be attached to the disc 1 before waterproof sheet construction.
may be attached in the manner described above.

A heat-fusible waterproof sheet 4 is placed over the heating wire 5 attached to or applied to the disk 1 on the tunnel primary lining surface 3, and a current is passed through the heating wire 5. The energization is
If the disc 1 is disposed in a region corresponding to a region other than the end portion of the waterproof sheet 4, a power supply device 8 as shown in FIG. 3 may be used. In FIG. 3, 9 is a clip-type power supply terminal, 10 is a resistor inserted into the circuit 11 of the terminal 9, and 1
2 represents a timer, and 13 represents a switch. When the disc 1 is disposed at a location corresponding to the end region of the waterproof sheet 4, the heating wire 5 of the disc 1 may be energized using the power supply device 6. In Figure 6, 10 is the terminal (7) (7)
12 is a timer, and 13 is a switch. 14 is the operation handle of the movable side terminal, 15
is a grip part of the power supply tool 6.

In this way, the disc 1 and the waterproof sheet 5 placed over the heating wire 5 are thermally melted by the heating wire 5. Therefore, by pressing the waterproof sheet 4 against the disc 1, the waterproof sheet 4 can be thermally welded to the disc 1. It is preferable to stop energizing the heating wire 5 at an appropriate time.

[0019] Stopping the current supply to the heating wire 5 may be controlled by the set time of the timer 12, and the amount of heat generated may be controlled by a variable resistor rather than the resistor 10.

After heat welding the waterproof sheet 4, the heating wire 5
Remove the power supply terminals 7, 7 or 9, 9 from the Tarpaulin sheet 4
Regarding the heating wire 5 of the disc 1 located in a region corresponding to a region other than the end portion, it is preferable to pull the circuit 11 and remove the power supply terminals 9, 9. The heating wire 5 of the disc 1 in the area corresponding to the edge of the waterproof sheet 4 is connected to the power supply terminal 7 of the handheld power supply device 6.
, 7, which is known per se.

The embodiment described above (FIG. 1) concerns the construction of a waterproof sheet on the primary lining surface of a tunnel.

An example of a method of applying a repair heat-weldable waterproof sheet to a heat-weldable waterproof sheet applied to the primary lining of a tunnel will be described below.

[0023] Example of construction of heat-weldable waterproof sheet for repair (
Figure 2) shows a heat-fusible waterproof sheet 40 as an object to which the waterproof sheet is attached, which is stretched over the tunnel primary lining surface 3.
This is substantially the same as the above-described construction example of the waterproof sheet for the tunnel primary lining surface, except that a repair heat-weldable waterproof sheet 42 is overlaid on the partially damaged area 41 with the intervening heating wire 50.

The heating wire 50 may be interposed between the waterproof sheets 40 and 42 using the same specifications as described in the previous embodiment.

In the construction of the waterproof sheet according to any of the embodiments, the heating wire 5 interposed between the two objects to be welded is
The extension mode is the above-mentioned specific mode, so that at least several of the weld lines of the object simultaneously and linearly perform a peeling-resistant function against drooping due to the weight of the waterproof sheet 4 or 40. Contribute.

[0026]

As explained above, according to the present invention, it is possible to avoid drooping, thinning and damage due to the weight of the tarpaulin sheet, and to ensure good welding of the tarpaulin sheet. This effect can also be achieved with respect to waterproof sheets.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the procedure for constructing a waterproof sheet according to the present invention.

FIG. 2 is a cross-sectional view showing the procedure for applying a repair waterproof sheet to a damaged part of an already installed waterproof sheet according to the present invention.

FIG. 3 is an elevational view illustrating a power supply device for heating wires used in the present invention.

FIG. 4 is a plan view showing a modified example of the extension mode of the heating wire according to the present invention.

FIG. 5 is a plan view showing another modified example of the extension mode of the heating wire according to the present invention.

FIG. 6 is a perspective view illustrating a handheld power supply device for heating wires used in the present invention.

[Explanation of symbols]

1 Heat-fusible disc 2 Nail 3　Tunnel primary lining surface 4 Heat weldable waterproof sheet 5 Heating wire 6 Power supply equipment 7 Clip type power supply terminal 8 Power supply device 9 Clip type power supply terminal 10 Resistor 12 Timer 13 Switch 40 Heat weldable waterproof sheet 41 Damaged parts 42 Heat-welding waterproof sheet for repair 50 Heating wire

Claims (3)

[Claims] Claim 1: A heat-fusible disc is attached to the primary lining surface of the tunnel, and the heat-fusible waterproof sheet is welded to the surface of the disc, with the extension pattern being in the direction around the center of the disc or in the direction around the center of the disc. A heating wire is applied in a zigzag shape in the diameter direction, and a heat-welding waterproof sheet is placed on top of it.
A method for constructing a tarpaulin sheet for a tunnel, characterized in that the heating wire is energized and the tarpaulin sheet is pressed against the disc. [Claim 2] A heat-welding disc equipped with heating wires extending in a zigzag shape around the center or in the diametrical direction is attached to the surface to which the heat-welding waterproof sheet is to be welded. A method for constructing a tarpaulin sheet for a tunnel, which comprises attaching it to a primary lining surface, overlaying a heat-fusible waterproof sheet over the heating wires of the disc, energizing the heating wires, and pressing the waterproof sheet against the disc. Claim 3: At a partially damaged location of the heat-welded waterproof sheet applied to the primary lining surface of the tunnel, the extension pattern is a zigzag pattern around the center or in the diametrical direction of the sheet surface at the location. A method for constructing a tarpaulin sheet for a tunnel, which is characterized in that a repair heat-weldable tarpaulin sheet is layered under the interposition of a heating wire forming a structure, the heating wire is energized, and the latter tarpaulin sheet is pressed onto the former tarpaulin sheet.