JPH0634473Y2 - Mounting plate for tunnel sealing band - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention comprises at least two concentric plate parts having different heights, and a predetermined breaking point is provided between both plate parts. One of the parts is fixed to the surface of the excavated rock of the tunnel or the concrete layer sprayed on the surface of the excavated rock, and the other strip is welded to the sealed strip. .

[Conventional technology]

When excavating tunnels, the problem of moisture due to water seepage from rocks occurs. To deal with this, on the surface of the tunnel rock or the concrete layer sprayed onto this rock,
It is possible to fix the attachment plate for the membrane plastic sealing band at predetermined intervals and attach the sealing band to this mounting plate by welding, thus covering the arc-shaped inner surface of the tunnel with the sealing band. The mounting plate is provided with a predetermined breaking point so that a rupture can occur at a place other than the closed band even when the load is applied to the closed band.

Fixing of the mounting plate is usually done by nails or pins that are hammered or shot into the rock or shotcrete layer. Dowels can also be used for fixing. The mounting plate usually also secures the drainage web to the rock or shotcrete layer. The drainage web has a role of absorbing water leaching from the rock or sprayed concrete layer and discharging it to the gutter on the ground of the tunnel. As a result, the closed zone is not subject to water pressure, so that an optimum closed state is created. An open-cell glass fiber web or plastic fiber web is used as the drainage web. After fixing the mounting plate to the rock or shotcrete layer, the closure band is welded to the mounting plate. The sealing band is usually constructed in the form of a film from plastic bands, which are laid one after the other in the circumferential direction of the tunnel and welded to one another at the joining points.
The closure band is made of, for example, an ethylene copolymer-brown blue mixture or polyvinyl chloride. The mounting plate is made of a material that can be welded to the closure band. The identity of the material of the mounting plate and the material mixture of the plastic closure zone is not a prerequisite for welding. Rather, it is usually sufficient to match the major constituents, eg polyethylene.

If a hot air blower is used as the welding device when welding the plastic sealing band to the mounting plate, there is a risk of heating the drainage web. This heating causes considerable damage to the drainage web, especially when using plastic drainage webs.

[Problems to be solved by the device]

The problem underlying the present invention is to prevent heating of the drainage web when welding the plastic sealing strip to the mounting plate.

[Means for Solving the Problems]

In order to solve this problem, according to the present invention, a heat shield welding protective edge is provided in a region outside the periphery of the welding surface of the other plate portion.

[Effect of device]

Thus, according to the present invention, the weld protection edge shields the drainage web, which is endangered during welding, against the heat of welding in the vicinity of the welding spot, so that the drainage web is protected from thermal damage.

[Embodiment]

According to the present invention, the welding protection edge is offset rearward of the welding surface, so that the welding process of the plastic sealing band is not disturbed by the welding protection edge. Weld protection edge 10 to 50
A width of mm is sufficient, and a thickness of 1 to 2 mm is sufficient.

〔Example〕

An embodiment of the invention is shown in the drawing. The circular mounting plate in plan view consists of two concentric plate parts 1 and 2 of different heights, which plate parts 1 and 2 are connected to each other via a predetermined breaking point 3. The predetermined destruction point 3 is
It is characterized by a small material cross section and twelve apertures of 3 mm each distributed evenly around the circle.
The diameter of the circle formed by these openings is 25 mm. Board part 2
It has a thickness of 3 mm.

The plate portion 1 of the mounting plate has an annular welding surface 4. A drainage web 10 is provided on the surface of the excavated rock of the tunnel itself or the concrete layer 9 sprayed on the rock by a pin, a nail 8 or the like that penetrates through the central plate portion 2.
After fixing with, the plastic sealing band 11 is welded to the annular welding surface 4. This annular welding surface 4 has a width of 25 mm. The plate part 1 with the welding surface 4 is connected to the plate part 2 via a tubular connecting part 5.

An annular weld protection edge 7 is connected to a region outside the periphery of the welding surface 4 via another tubular connecting portion 6. The weld protection edge 7 ends at the lower edge of the tubular connecting part 6. In the example, the weld protection edge 7 has a width of 30 mm and a thickness of 1.5 mm.

When the plastic sealing band 11 is welded to the welding surface 4 and attached to the attachment plate, the welding protection edge 7 prevents the drainage web 10 from being damaged by welding heat. Drainage web 10 as described above
Are held by the plate portion 2 in the excavated rock or in the concrete layer 9 sprayed on it.

The predetermined breaking point 3 is sheared under a load of 50 kg. This load is within the limit where damage to the plastic sealing band 11 occurs. As a result, the plastic sealing zone 11 is sheared from the plate section 1 together with the plate section 1 during movement of rocks or other tensile forces, but the sealing zone 11 is not damaged.

[Brief description of drawings]

The drawing is a cross-sectional view of a sealing band mounting plate according to the present invention. 1,2 …… Plate part, 3 …… Predetermined breaking point, 4 …… Welding surface,
7 ... Welding protection edge

Claims (3)

[Scope of utility model registration request] Claim: What is claimed is: 1. At least two concentric plate parts having different heights are provided, and a predetermined breaking point is provided between both plate parts, and one of these plate parts is a rock excavated in a tunnel or This is fixed to the surface of the concrete layer sprayed on the surface of the excavated rock, and the sealing band is welded to the other plate part. In the range outside the periphery of the welding surface (4) of the other plate part (1). An attachment plate for a closed band of a tunnel, which is provided with a welding protection edge (7) for heat shielding. 2. Mounting plate according to claim 1, characterized in that the welding protection edge (7) is offset behind the welding surface (4). 3. Mounting plate according to claim 1 or 2, characterized in that the weld protection edge (7) has a width of 10 to 50 mm and a thickness of 1 to 2 mm.