JPS6362639B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is provided between a primary lining concrete and a secondary lining concrete of a tunnel, and prevents spring water from flowing from the primary lining concrete side from flowing into the tunnel. The present invention relates to a method for fixing a waterproof sheet to an inner peripheral wall of primary lining concrete to prevent the waterproof sheet from seeping into the secondary lining concrete side.

[Conventional technology]

Conventionally, in the tunnel lining section, as shown in Figure 1, a primary lining concrete b is cast on the ground a side, and a waterproof sheet c is attached to the primary lining concrete b using bolts, concrete nails, etc. This is done by nailing and fixing, and then pouring a secondary lining concrete d onto this waterproof sheet c. By interposing the waterproof sheet c between the primary and secondary lining concrete b and d, the primary lining concrete d is Spring water from the lining concrete b side is prevented from seeping into the secondary lining concrete d side.

[Problem to be solved by the invention]

In this construction, it is necessary to sequentially connect and fix a large number of waterproof sheets to the primary lining concrete inner peripheral wall along the length of the tunnel.
In this case, the waterproof sheet must be fixed and connected in a watertight manner; if these are not done watertightly, spring water from the primary concrete lining will leak into the secondary concrete lining.

Conventionally, as shown in Fig. 2, a waterproof sheet has generally had a water passage e formed on one side, and one edge of a narrow synthetic resin sheet f pasted along its length on the other side. This is then nailed to the primary lining concrete b using nails g, and furthermore, in order to prevent water leakage at the nailed part,
The other edge of the narrow sheet f is heated and welded to a waterproof sheet covering the nailed portion to form a waterproof pocket h. However, when using the above-mentioned method of fixing the tarpaulin sheet, it is necessary to weld the other edge of the sheet f and the tarpaulin sheet using a burner in order to form the waterproof pocket h. Since there are a large number of them, there are problems in that they are time-consuming, complicated, and have poor workability.

The present invention has been developed in view of the above circumstances, and allows for easy and efficient waterproofing of the locations where fixing members such as nails are driven.It has good workability and also ensures that water does not leak from the locations where nails and other fixing members are driven. It is an object of the present invention to provide a method for fixing a tarpaulin sheet that can prevent the above problems.

[Means to solve the problem]

In order to achieve the above object, the present invention is installed between the primary lining concrete and secondary lining concrete of a tunnel to prevent spring water from the primary lining concrete side from seeping into the secondary lining concrete side. When fixing a waterproof sheet to the primary lining concrete, one side of the waterproof sheet is brought into contact with the inner wall surface of the primary lining concrete, and then a thermoplastic layer is formed on the other side of the waterproof sheet. Alternatively, one side of the waterproof sheet, on which a thermoplastic layer has been previously formed on the other side, is brought into contact with the inner peripheral wall surface of the primary lining concrete, and then this thermoplastic layer is applied from the thermoplastic layer side. and by driving fixing members such as nails into the primary lining concrete wall sequentially through the waterproof sheet, embedding part or all of the heads of the fixing members such as nails in the thermofusible material layer. Then, the thermofusible material layer is heated to cover the head of a fixing member such as a nail with the thermofusible material layer.

In this case, a hot melt adhesive is preferably used as the thermofusible substance. Furthermore, concrete nails or the like are used as the fixing member.

[Effect]

According to the method for fixing a waterproof sheet of the present invention, nails are passed through the thermofusible material layer and the waterproof sheet in sequence from the thermofusible material layer formed on the other side of the waterproof sheet to the primary lining concrete wall. By driving a fixing member such as a nail, part or all of the head of the fixing member such as a nail is embedded in the thermofusible material layer, and then the thermofusible material layer is heated to become thermofusible. Since the head of a fixing member such as a nail is covered with a layer of meltable material, the driving part of the fixing member such as a nail can be completely covered, thereby ensuring that water does not leak from the driving part of the fixing member such as a nail. In addition, after the fixing member is driven in, the part where the fixing member is driven in can be waterproofed simply by heating the thermofusible material layer, so it is excellent in operability and workability.

3 to 5 for one embodiment of the present invention.
This will be explained with reference to the figures.

〔Example〕

In the figure, reference numeral 1 shows an example of a waterproof sheet used in carrying out the present invention. A groove-like passageway 4 is formed between these protrusions 3.

In this embodiment, the surface of the waterproof sheet 1 on which the protrusions 3 are formed faces toward the primary lining concrete 5 side, and the waterproof sheet 1 is brought into contact with the inner circumferential wall of the primary lining concrete 5, and the protrusions 3 are formed. A sheet of thermofusible material 6 is stacked at a position corresponding to the protrusion 3 on the other side, and from the surface of this sheet 6,
Nails 7 are driven into the primary lining concrete 5 through the sheet 6 and the waterproof sheet 1. FIG. 4 shows the nail 7 driven in this manner, with its head 8 embedded in the sheet 6 of thermofusible material.

Note that ethylene is used as the thermofusible material sheet.
Preferred are hot melt adhesive sheets, raw rubber sheets, synthetic rubber sheets, etc. made from vinyl acetate copolymer or the like. Moreover, as the nail 7, a nail for driving concrete can be suitably used.

Next, the thermofusible material sheet 6 stacked on the other side of the waterproof sheet 1 as described above is heated and melted. Through this heat treatment, the thermofusible material sheet 6
is fluidized and naturally covers the head of the nail 7,
Weld to the tarpaulin sheet 1, and attach the tarpaulin sheet 1 and the nail 7.
integrated with.

Thereafter, by allowing the heated molten part to cool, the molten part solidifies, thereby forming a coating layer with good watertightness, in which the head 8 of the nail 7 is embedded, as shown in FIG. 9 is formed.

Here, the thermofusible material sheet 6 can be heated using a burner or a trowel, but it is preferable to adopt a heating method using a burner from the viewpoint of workability and the like.

In this way, the waterproof sheet 1 is fixed with the chevron-shaped protrusions 3 facing the primary lining concrete 5 side, and with the length direction of the chevron-shaped protrusions 3 coinciding with the circumferential direction of the tunnel. In this case, spring water from the primary lining concrete 5 side flows down through the water passage 4.

Note that a known connection method such as heating and welding the edges of each sheet may be appropriately selected to connect the waterproof sheets.

This fixing method involves stacking the thermofusible material sheet 6 on the waterproof sheet 1, driving nails into it, and then heating and welding the sheet 6. This method is easy to operate, and can be attached to any concrete wall in the tunnel. The waterproof sheet 1 can be easily fixed to the parts and has good operability. Since the thermofusible material sheet 6 is flexible, when a nail is driven through it, its head 8 is naturally partially or completely buried within the sheet 6, and remains in this state. When sheet 6 is heated,
The sheet 6 is fluidized, and the fluidized sheet 6
The head 8 is naturally covered, and the waterproof sheet 1 and the head 8 are fused together, and when this is left to cool, a covering layer 9 is formed, but this is extremely watertight. This is to reliably prevent an accident in which spring water from the primary lining concrete 5 side passes through the part where the nails 7 are driven and leaks to the secondary lining concrete side. Furthermore, when the thermofusible material sheet 6 is formed of a hot melt adhesive, it is easy to heat and melt, and the adhesive strength is large, so that the above-mentioned effects can be reliably achieved.

In this embodiment, one nail 7 is driven into the thermofusible material sheet 6, but the invention is not limited to this, and a plurality of nails 7 may be driven into the thermofusible material sheet 6.
Further, the waterproof sheet is not limited to the shape described above, and furthermore, in this embodiment, sheets of thermofusible material are stacked on the waterproof sheet.
The present invention is not limited to this, and for example, the thermofusible material does not necessarily have to be in the form of a sheet;
When a fixing member such as a bolt is driven, part or all of its head may be buried and a layer of thermofusible material may be formed to cover the head by heating. It is also possible to use a waterproof sheet on which a layer of thermofusible material has been formed in advance (in this case, one side of the waterproof sheet, on which a layer of thermofusible material has been previously formed on the other side, is placed inside the primary lining concrete. After bringing it into contact with the surrounding wall surface, the fixing member may be driven in in the same manner as in the above embodiment, and the other configurations and effects are the same as in the above embodiment, so the explanation thereof will be omitted). However, the object of the present invention can be effectively achieved, and various modifications may be made without departing from the gist of the present invention.

Hereinafter, the present invention will be explained in more detail using specific examples.

Specific example 1 A waterproof sheet with a length of 30 m, a width of 1.8 m, and a thickness of 3 mm, with a water passage formed on one side, is placed in contact with the inner peripheral concrete wall of the tunnel's primary lining.
Layer 3mm thick hot melt adhesive sheets,
Concrete nails were driven into the primary lining concrete from above this adhesive sheet. In this case, the head of the concrete nail was buried in the hot melt adhesive sheet. Next, the hot melt adhesive sheet was heated and melted using a burner. The adhesive sheet thereby flowed and naturally coated the concrete nail. When allowed to cool, the heated portion solidified, and the coating layer thus formed was highly watertight and durable.

Specific example 2: On the other side of a waterproof sheet 17 m long, 1.8 m wide, and 3 mm thick, a surface with an outer diameter of 4 cm, an inner diameter of 3.5 cm, and a thickness of 5 mm is illuminated at 50 cm intervals along both edges in the length direction. A polyethylene frame colored with paint was heat-sealed. Next, a hot melt adhesive was melted and filled into the fused frame and allowed to cool and solidify. One side of the waterproof sheet thus produced was brought into contact with the inner peripheral wall of the primary lining concrete of the tunnel, and concrete nails were driven into the primary lining concrete from above the filled hot melt adhesive. This nail is a concrete nail whose head is coated with hot melt adhesive mixed with fluorescent paint, and when the nail is driven into the primary lining concrete by penetrating it from above the hot melt adhesive filled with the above. , its head was buried in the filled hot melt adhesive sheet. In this state, the filled hot melt adhesive and the hot melt adhesive applied to the head of the nail were heated and melted using a burner. The adhesive thereby flowed and coated the concrete nail. When allowed to cool, the heated portion solidified, and the coating layer thus formed was highly watertight and durable.

In this case, since the frame and the head of the nail were coated with fluorescent paint, the nail driving location could be easily confirmed even in a relatively dimly lit tunnel, resulting in good workability.

Additionally, when using nails whose heads are not coated with adhesive, if the heads of the nails are dirty, it may be difficult for the adhesive to adhere to that part; however, in this example, Since the head of the nail was coated with an adhesive mixed with fluorescent paint in advance, the adhesion of the hot melt adhesive to the head of the nail was good.

Concrete Example 3 The same process as in Example 2 was carried out, except that a waterproof sheet with a hot melt adhesive sheet of 4 cm in diameter and 3 mm in thickness was welded to the position corresponding to the frame on one side of the sheet used in Concrete Example 2. This was fixed to the primary lining concrete using the following procedure. In this case, the heat from the burner is transmitted through the nails to the hot melt adhesive on one side, melting the hot melt adhesive on one side without melting the waterproof sheet, and thereby the nails and the hot melt adhesive sheet are bonded even on one side. It was done. The watertightness of the nailed portion of the waterproof sheet fixed in this manner was even better.

〔Effect of the invention〕

Since the method of the present invention is configured as described above, the waterproof sheet can be fixed to any desired inner peripheral wall portion of the primary lining concrete very easily, and its operability is good. Further, since the fixing member driving portion of the waterproof sheet is coated with a thermofusible material, it has the advantage of reliably preventing water leakage from this portion.

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view of the tunnel lining where a waterproof sheet is installed, Figure 2 is a partially omitted enlarged cross-sectional plan view showing how the waterproof sheet is attached to the conventional primary lining concrete, and Figure 3 4 is a partially omitted perspective view showing an example of the waterproof sheet used in the present invention, and FIG. 4 is a partially omitted enlarged cross-section showing the waterproof sheet attached to the inner peripheral wall of the primary lining concrete with nails when implementing the present invention. The side view and FIG. 5 are partially omitted enlarged cross-sectional side views showing a state in which a waterproof sheet is fixed to the inner circumferential wall of the primary lining concrete according to the embodiment of the present invention. 1... Waterproof sheet, 5... Primary lining concrete, 6... Thermofusible material sheet, 7... Nail, 8...
…head.

Claims (1)

[Claims] 1. Disposed between the primary lining concrete and secondary lining concrete of the tunnel, to prevent spring water from the primary lining concrete side from seeping into the secondary lining concrete side. In the method of fixing a waterproof sheet to the inner peripheral wall of the primary concrete lining, one side of the waterproof sheet is brought into contact with the inner peripheral wall of the primary concrete lining, and then the other side of the waterproof sheet is fixed with thermofusible material. A material layer is formed, and then a fixing member such as a nail is driven into the primary lining concrete wall by sequentially penetrating the heat-fusible material layer and the waterproof sheet from the heat-fusible material layer side. A part or all of the fixing member such as a nail is buried in the thermofusible material layer, and then the thermofusible material layer is heated to cover the head of the fixing member such as a nail with the thermofusible material layer. How to fix the tarpaulin. 2. The fixing method according to claim 1, wherein the thermofusible material layer is a hot melt adhesive layer. 3. The fixing method according to claim 1 or 2, wherein the fixing member is a concrete nail. 4. A waterproof sheet is placed between the primary lining concrete and secondary lining concrete of the tunnel to prevent spring water from seeping from the primary lining concrete side into the secondary lining concrete side. In a method for fixing a waterproof sheet to an inner peripheral concrete wall, one side of the waterproof sheet, on which a layer of thermofusible material has been previously formed on the other side, is brought into contact with the inner peripheral wall surface of the primary lining concrete, and then the thermofusible material layer is applied to the inner peripheral concrete wall. By driving a fixing member such as a nail into the primary lining concrete wall sequentially through the heat-fusible material layer and the waterproof sheet from the material layer side, part or all of the head of the fixing member such as the nail is exposed to the heat. A method for fixing a waterproof sheet, which comprises embedding the sheet in a layer of a fusible material, and then heating the layer of the thermofusible material to cover the head of a fixing member such as a nail with the layer of the thermofusible material. 5. The fixing method according to claim 4, wherein the thermofusible material layer is a hot melt adhesive layer. 6. The fixing method according to claim 4 or 5, wherein the fixing member is a concrete nail.