JPS5941219Y2 - waterproof sheet - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waterproof sheet suitable for waterproofing bridge surfaces such as road bridges.

In road bridges, elevated roads, elevated parking lots, etc. (hereinafter simply referred to as road bridges), there is a Asphalt waterproofing is applied, and a heated asphalt mixture pavement is applied on top of the waterproofing layer.

This asphalt waterproofing has conventionally been made by coating cardboard (for example, roofing base paper), woven fabric, non-woven fabric with asphalt and coating it with asphalt. A commonly used method is to attach a waterproof sheet or the like to the floor slab using blown asphalt, which is heated and melted, to form a waterproof layer.

However, when the bridge surface is made of concrete slabs, due to the large unevenness of the slab surface and the moisture generated from within the slab, the waterproof layer formed by pasting the waterproof sheet with heated and melted asphalt cannot be used. It almost always causes some blistering.

Pavement is generally formed by laying a heated asphalt mixture on top of this waterproof layer and compacting it. However, because the heating temperature of the heated asphalt mixture is usually around 150 to 160 degrees Celsius, the waterproof layer tends to swell. As a result of the expansion of the moisture and air contained in the asphalt, the heated asphalt mixture could not be rolled or rolled smoothly, and there was a risk that the finished pavement would be cracked, slipping, and other defects.

For this reason, the current practice is to manually punch holes in the swollen parts of the waterproof layer one by one with a sharp object such as an awl or awl just before paving, and then crush the bulges before paving. .

Not only does this work of removing swelling require a lot of effort, but it also requires a lot of effort.
If you are working at night, you may not be able to see the bulge, and you may forget to drill the hole.

Additionally, if it rained after the holes were opened, there was a risk that rainwater would flow under the waterproof layer, so it was necessary to open the holes immediately before paving.

The waterproof sheet of the present invention solves these drawbacks by providing holes of 6 mm in diameter at appropriate intervals on the entire surface of the sheet, which has been impregnated with bituminous material. The gist of the waterproof sheet is a waterproof sheet that is coated with water to close the through holes provided in the sheet, and is coated with powder particles such as mineral substances.

If the waterproof sheet of this invention is applied to the floor slab with heated and melted bituminous material to form a waterproof layer, the bituminous material covering the surface of the through holes provided in the base of the waterproof sheet will heat up when the waterproof layer is installed. It is heated by the heat of the molten bitumen, softening or melting, and acts as a kind of valve, allowing gases such as air and water vapor to escape to the outside.The tarpaulin sheet is bonded to the floor slab without blistering, so it can be used immediately before paving. There is no need to make holes in the waterproof layer, it has good waterproof properties, and the pavement does not crack or shift due to swelling of the lower waterproof layer, not only during paving but also after paving is completed. It is possible to obtain a good pavement in which the waterproof layer and the pavement body are integrated.

Next, the waterproof sheet of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the waterproof sheet of the present invention, and FIG. 2 is a cross-sectional view passing through a hole in the waterproof sheet.

In the figure, 1 is a sheet to which bituminous material has been permeated and adhered.

Reference numeral 2 denotes through holes, which are provided at appropriate intervals on the entire surface of the sheet 1 as diameter or 6rrrm holes.

Reference numeral 3 denotes a bituminous material layer that covers the surface of the sheet 10 (one or both of the front and back surfaces) and closes the through holes 2 provided in the sheet 1.

Reference numeral 4 denotes powder particles such as mineral substances attached to the surface of the bituminous material layer 30.

The sheet 1 referred to in the present invention is made of natural fibers of animals and plants, pulp,
Man-made fibers, synthetic fibers, inorganic fibers, carbon fibers, metal fibers,
Non-woven fabrics made of plastic, woven fabrics, paper, etc., which are normally used as base materials for waterproof sheets, can be freely used, and bituminous material is permeated and adhered to the sheet 1.

Further, the through hole 2 provided in the sheet 1 has a diameter of l to 6t.
ran, and if the diameter is less than 1 m, the air permeability will be insufficient, and if the diameter exceeds 6 rtan, it will be difficult to close the through hole 2 with the bitumen layer 3, and preferably 2 to 4 rrm is appropriate. It is.

A suitable interval between the through holes 2 is approximately 5 Crr1 to 60 cm, and the manner of taking this interval and further the shape of the through holes 2 can be freely selected.

For example, a circular hole with a diameter of 3rrR, 30~40crri
It is sufficient to provide one at intervals of .

That is, the thickness of the sheet 1, the shape and size of the through hole 2, the through hole 2
The interval can be increased or decreased as appropriate.

The sheet 1 can also be made by making holes 2 in advance in a non-woven fabric, woven fabric, paper, etc., and then penetrating and adhering bituminous material to the holes 2.
Alternatively, when a non-woven fabric, woven fabric, paper, etc. in which through holes 2 have been formed in advance are coated with the bituminous material layer 3, the bituminous material may be infiltrated and adhered at the same time as the coating.

The bituminous material referred to in the present invention generally includes asphalt such as straight asphalt, semi-prone asphalt, blown asphalt, and natural lake asphalt, and asphalt modified by adding and mixing asphalt with rubber or resin.

Other tar-based substances include tar, pitch, etc.
Tar modified by adding and mixing rubber, resin, etc. to these,
Pitch etc. are used.

Tar and pitch-based materials have better oil resistance than asphalt-based materials.

In addition, the bituminous material layer 3 is a sheet 1 that becomes the base of the waterproof sheet.
The thickness must be sufficient to cover the 0 surface and close the through hole 2.

Usually, a considerable amount of filler, for example, about 5 to 50 φ, is sometimes added to the bituminous material of the bituminous material layer 3 in order to improve weather resistance, strength, temperature sensitivity, etc.

The bituminous material used for penetrating the sheet 1 and the bituminous material used for coating the bituminous layer 3 are generally different, but they can also be the same.

Further, as the mineral powder 4, the mineral powder that is attached to the surface of ordinary asphalt roofing or sand roofing is used.

That is, they include sand, silica sand, iron sand, silica sand powder, silica powder, glass powder, mica flakes, mica powder, talcum powder, diatomaceous earth, slate powder, asbestos powder, other stone powders, giltstone powder, coal powder, and the like.

These powder particles 4 may be the same on the front and back of the tarpaulin sheet, or may be different on the front and back.

The waterproof sheet of the present invention is constructed as described above and has the following features and effects.

(1) A waterproof sheet can be pasted onto the floor slab by pouring hot melted bituminous material using the usual method.

It can be easily pasted with heat-melted bituminous material in the same manner as general waterproof sheets that do not have through holes in their base sheets.

(2) There is little chance of blistering in the waterproof layer, and even if there is some blistering, there will be no holes in the waterproof layer.
This can be paved with a good hot asphalt mixture.

Due to the holes provided in the base sheet of the waterproof sheet, almost no blistering occurs in the waterproof layer during waterproofing construction.

Even if the waterproof layer blisters due to the condition of the floor slab, if a heated asphalt mixture is placed over it, the bituminous material in the holes in the base sheet of the waterproof sheet will soften or melt due to the heat. However, the heated and expanded air and water vapor under the waterproof layer are released from this part to the outside.

At the same time, this area is depressurized and the blisters are eliminated and sealed with bituminous material.

The bituminous material in the through-hole portion of the base sheet acts like a valve.

For this reason, the heating of the asphalt mixture can be smoothly applied to the carpet, and furthermore, the roller rolling can be performed smoothly.

Then, the waterproof layer is heated and pressed onto the deck slab by the heat and pressure of the heated asphalt mixture, and the heated asphalt mixture bites into the waterproof layer and bonds, and the pavement is firmly bonded to the deck slab via the waterproof layer. , a good pavement body can be obtained.

(3) The waterproof layer is good.

Even if a waterproof layer is formed, the holes made in the base sheet of the waterproof sheet are sealed with bituminous material, so if there are no holes in the waterproof layer before paving, water may leak through the waterproof layer to the slab due to rainfall. There is no.

(4) The waterproof layer acts as a good bonding material to the pavement slab and at the same time serves as a good absorption layer for the vibration and shock caused by the traffic load after the pavement is opened, and also serves as a barrier between the pavement and the slab due to changes in the weather. Since it becomes a stress absorbing and relaxing layer, it can improve the lifespan and durability of the pavement and deck slab.

[Brief explanation of drawings]

The drawings show an embodiment of the waterproof sheet of the present invention, and FIG. 1 shows a partially cutaway perspective view of the waterproof sheet, and FIG. 2 shows a cross-sectional view through the through hole of the waterproof sheet I. . The symbols in the figure are explained as follows. 1 is a sheet, 2 is a through hole, 3 is a bituminous layer, and 4 is a powder particle such as mineral material.

Claims (1)

[Scope of utility model registration request] Circular machining or 6rI on the entire surface of the sheet to which bituminous material has been penetrated and adhered.
It is characterized by providing rIn holes at appropriate intervals, covering the surface of the sheet with bituminous material to block the holes provided in the sheet, and then adhering powder particles such as mineral substances on top of the bituminous material. A tarpaulin sheet.