JPH0240156Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on Natom (New Austrian Tunneling).
NATM (abbreviation for Method) relates to plates for attaching insulating layers.

In order to prevent water leakage and cracking of the secondary concrete lining, Natom uses an insulating layer between the primary shotcrete lining and the secondary concrete lining. This is a method in which a non-woven fabric is stretched over the primary lining surface and a waterproof sheet is placed on top of it.The interposition of the non-woven fabric and the waterproof sheet cuts the edge of the secondary lining concrete from the primary lining surface, and also prevents drainage from the back of the secondary lining concrete. We will ensure that the process is carried out smoothly and reliably.

Conventionally, the construction of Natom's insulating layer was usually done by driving concrete nails with a concrete nail gun, stretching a non-woven fabric over the primary lining surface, then layering a waterproof sheet on top of that, and then driving concrete nails with a concrete nail gun. , it depends on the method of fixing. According to this conventional method, since the waterproof sheet is perforated by driving concrete nails, there is an inconvenience that water leaks from the perforation. Furthermore, even when a waterproof washer made of rubber or the like was applied to the nailing area, water leakage was observed when water pressure was applied.

Conventionally, in order to solve this problem, a heat-weldable disk 1 to which a waterproof sheet is attached by welding has been devised, and the disk 1 has the shape and structure as shown in FIG. 1. This is a flexible material that deforms according to the unevenness of the primary lining surface that conforms to the unevenness of the ground.As shown in Fig. 2, it is applied onto a nonwoven fabric 2, and a concrete nail 4 with a metal washer 3 is attached to the disk 1. Aim the metal washer 3 into the center nail hole 5 with a nail gun so that it fits into the washer hole 6 at the center back of the disk, thereby fixing the nonwoven fabric 2 and the disk 1 to the primary lining surface. By melting the surface of the disc on the anti-nonwoven fabric side and the corresponding surface of the waterproof sheet with hot air, and pressing and welding the waterproof sheet to the disk, the waterproof sheet can be pasted without drilling with nails. It is.

However, in conventional discs, the side facing the non-woven fabric has a shape in which the metal washers of the concrete nail, that is, the boss part 7 and the surrounding rim part 8, are on the same plane. When nailed, the metal washer 3 is plastically deformed into a spherical shape by the impact of the nail, and the disk as a whole is also flexible and bends greatly as shown in Figure 2, causing the flatness of the back surface to be used as the welding surface for the waterproof sheet. There was a drawback that the product was damaged. Also, conventionally,
The work was not always easy, as it was necessary to set a concrete nail with a metal washer in a nail gun, center it so that the washer hole on the back of the disk and the metal washer of the concrete nail faced each other, and then drive. Furthermore, in order to reduce frontal deflection, conventional disks have a relatively thick wall overall, but the thicker the wall, the worse the melting effect of hot air, making it difficult to waterproof the thick wall that is normally used. In the case of sheets, if hot air is blown onto the parts of the disk and tarpaulin to be welded, the tarpaulin will melt before the disk melts, creating holes and making welding impossible. The diameter must be reduced to account for the increased wall thickness, and the blown hot air may protrude beyond the disk, causing the nonwoven fabric to protrude and be exposed to the hot air, causing it to melt instantly.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks of conventional disks, and to provide a plate for attaching Natom's insulating layer that does not impair the flatness of the back surface and can be made thinner overall than conventional disks. .

Explaining FIGS. 3 and 4, Natom's insulating layer attachment plate of the present invention has a boss portion 20 into which a concrete nail a is driven and a rim portion 21 surrounding the boss portion 20, and the entire plate is made of a heat-fusible composition. The boss portion 20 is connected to the rim portion 21.
Make it slightly protrude toward the concrete nail a driving side,
A metal washer 22 is embedded and integrated in the boss part 20, and a hole 23 with a diameter corresponding to the muzzle of a concrete nailing gun (not shown) is formed in the boss part 20 at the back of the washer. .
In the figure, 24 is a nail hole in the boss portion 2.

In the plate of the present invention, the metal washer 22 is embedded and integrated in the boss part 20 into which the concrete nail a is driven, so the boss part 20 is effectively reinforced by the metal washer 22. Therefore, by applying the plate of the present invention to the nonwoven fabric 26 on the surface of the primary lining 25 and driving concrete nails a into the primary lining 25 through the nail holes 24 with a concrete nailing gun, even if the plate is a flexible one that requires a plate, The boss portion 20 hardly bends, and as a result of the metal washer 22 being buried and integrated, plastic deformation due to nail impact is suppressed, only the central portions of the plate boss portion 20 and the metal washer 22 bend slightly. Therefore, the flatness of the back surface of the plate is not impaired. Therefore, according to the present invention, there is no need to increase the thickness of the plate in order to alleviate the deformation of the entire plate due to the impact of nail driving. The diameter of the nonwoven fabric can be increased, and the inconvenience of hot air being blown out of the flow rate and melting away the nonwoven fabric can be avoided.

Furthermore, in the present invention, since the boss portion 20 slightly protrudes from the rim portion 21 surrounding it toward the concrete nail a driving side, the boss portion 20 may sink into the nonwoven fabric 26 when the concrete nail a is driven. Under this condition, the plate is nailed to the primary lining 25, and the rim portion 21 is attached to the non-woven fabric 2.
This contributes to holding down the nonwoven fabric 26 well without floating up from the surface of the nonwoven fabric 26, thereby ensuring stable holding of the nonwoven fabric 26.

In the present invention, a hole 23 with a diameter corresponding to the muzzle of a concrete nailing gun is formed in the rear part of the washer 22 of the boss part 20 under the buried metal washer 22. By inserting the muzzle of the gun into the hole 23, it can be used as a guide to facilitate centering.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional disk, Fig. 2 is a longitudinal sectional view showing how it is nailed, Fig. 3 is a longitudinal sectional view showing an embodiment of the present invention, and Fig. 4 is a longitudinal sectional view showing how it is nailed. It is a longitudinal cross-sectional view showing a state. 1 is a conventional disk, 2, 26 is a nonwoven fabric, 3, 2
2 is a metal washer, 4, a is a concrete nail,
5 and 24 are nail holes, 7 and 20 are boss parts, 8 and 21 are rim parts, and 23 is a hole.

Claims (1)

[Scope of utility model registration request] A plate having a boss part into which a concrete nail is driven and a rim part surrounding the boss part, the whole being made of a heat-fusible composition, the boss part slightly protruding from the rim part toward the concrete nail driving side, A plate for attaching an insulating layer of Natom, in which a metal washer is embedded and integrated in the boss part, and a hole with a diameter corresponding to the muzzle of a concrete nailing gun is formed in the boss part of the back part of the washer.