JPS5916058B2 - How to install protective footing for rooftop waterproof layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a protective covering for a waterproof layer installed on the roof of a concrete building.

Conventionally, after wrapping a waterproof membrane layer with asphalt etc. on a flat roof, a layer of leather with a diameter of 5 to 257'n is applied to protect the top surface.
A method called the gravel spreading method is used, in which washed gravel of approximately 20 mm or more is laid down in layers to a thickness of 20 mm or more, but the gravel moves due to wind and rain, walking during repairs, maintenance, etc. The thickness varies.

The waterproof layer may be exposed and may not fully fulfill its protective role.

Furthermore, during movement, the edges of the gravel may sink into the waterproof layer, causing damage to the waterproof layer.

In addition, strong winds can blow away gravel and cause unexpected harm to nearby houses and other objects.

What methods are currently being taken to improve this?

This is a method in which an adhesive paint made of asphalt dissolved in an organic solvent is applied or spread on the top surface of the waterproof layer, and gravel of 20 mm or more is spread on top of it.

However, the disadvantage of this method is that the solvent used tends to erode the asphalt waterproofing layer, so it tends to be applied very thinly.

Therefore 207W2I! Since only a portion of the bottom surface of the gravel layer is adhered, although it is somewhat effective, it is not a sufficient improvement measure.

If enough paint is used to fix the entire gravel layer, the solvent will further erode the waterproofing agent layer, which will not only deteriorate the protection of the waterproofing layer, but also pose a risk of ignition of the solvent, making it difficult to work on site. 5 Things that are not suitable.

Therefore, it is possible to inject commercially available aqueous asphalt emulsions or synthetic resin aqueous emulsions into the gravel layer, dry them, and fix the gaps between the gravels. Even if the gravel is filled with solid asphalt or synthetic resin, the gaps between the gravel cannot be filled with solid asphalt or synthetic resin, and the waterproof layer underneath cannot be sufficiently suppressed. A large amount of waste flows out to the outside of the gravel, and in order to fill the voids between gravel with the solid content, it is necessary to repeat the pouring and drying and solidification work, and the pressing method requires a considerable amount of time and effort. This was confirmed through experiments by the inventor.

That is, the present inventor poured a commercially available asphalt emulsion (asphalt content: 50 to 65 parts by weight and remaining water: 35 to 50 parts) directly onto the N gravel layer, and fixed the gravel by evaporating the water and drying it. However, due to its low viscosity and high fluidity, the asphalt emulsion poured into the gravel layer was easily washed away, and the voids between the gravel were not filled with asphalt sufficiently, resulting in insufficient binding of the gravel and the movement of the gravel. I couldn't hold it down enough.

Similar results were obtained for commercially available aqueous emulsions of synthetic resins.

In addition, in the case of the above-mentioned asphalt emulsion, since it is made from straight asphalt, it has a low softening point and tends to flow easily in the summer and cracks easily in the winter.
It is necessary to improve this by some means such as inquiries.

The present invention ameliorates the drawbacks of conventional water-based emulsions as well as commercially available water-based emulsions, and provides a water-resistant coating on the top surface of the waterproof layer without the risk of fire.
To provide a construction method that quickly and easily forms a protective layer that substantially fills the voids between gravel, and at the same time provides a protective layer of good asphalt quality that improves the inferiority of straight asphalt. Then, a layer of gravel is laid out on the top of the waterproof layer applied to the roof of the building, and a prepared liquid prepared by mixing 100 parts by weight of asphalt emulsion with 20 to 50 parts by weight of bituminous powder is sprinkled on this gravel layer. It is characterized by being injected into the gaps between the gravel on the upper surface of the waterproof layer and dried and solidified in the first step.

Next, one example of implementation of the present invention will be described.

In the drawings, reference numeral 1 indicates a roof made of a concrete slab of a building, and reference numeral 2 indicates a waterproof layer constructed by a conventional method, such as an asphalt waterproof layer.

The upper surface of the asphalt waterproof layer 2 is 5 to 251 m by a conventional method.
Gravel 3 with a diameter of 20 mm to 20 mm or more is laid out in layers to form a gravel layer having numerous voids 4 between the gravels 3, 3.

Add and mix 20 to 50 parts by weight of bituminous powder to a commercially available asphalt emulsion (asphalt content: 50 to 65 parts by weight, balance: 50 to 35 parts by weight) from above the gravel layer laid out in this manner. It was created.

The prepared liquid thus obtained is sprayed over the entire surface.

The prepared liquid flows through the gap 4 between the gravels 3, 3, reaches the upper surface of the waterproof layer 2, and gradually accumulates in the gap 4 between the gravel 3 on the upper surface as well as the gap 4 between the gravels 3, 3.

During that time, countless emulsified asphalt fine particles and bituminous powder in the liquid are deposited on the surface of the three gravels on the surface of the waterproof layer, coating them to an appropriate thickness and connecting the gravels 3 and 3. Become.

After injecting an appropriate amount of vaginal fluid in this manner, leave the S as it is to dry naturally.

At this time, the water in the liquid evaporates and dries, and the dried solidified product 5 consisting of asphalt fine particles and bituminous powder, which are solids in the liquid, adheres to the upper surface of the waterproof layer 2, and the gravel 3, 3
A mutually fixed filling layer 5 is formed.

In other words, countless pieces of gravel 3 are spread on the top surface of the waterproof layer 2.
A novel protective pressure layer 6 according to the present invention is formed in which the dry bituminous material 5 filled and interposed is bonded to each other and to the two surfaces of the waterproof layer 5.

Thus, since the bitumen solidified material 5 has appropriate viscoelasticity, it fills the gravel 3 on the waterproof layer 2 and the gravel 3 as well as the gaps 4 between the gravel 3 and firmly binds them together. A dense waterproof protective pressing layer is obtained, resulting in a protective layer 6 that can follow the shaking of the building.

Moreover, when the waterproof layer 2 is a bitumen waterproof layer 2 of the same quality as the bitumen solidified material 5, the state of adhesion and solidification of the protective layer 7 to the waterproof layer 2 is further improved.

As a result of various studies on the amount of bituminous powder added to the above asphalt emulsion, it was found that approximately IO weight %LJ
If the bituminous powder mentioned below is added, the amount of bituminous material adhering to the gravel surface will be too small and there is a risk that it will not be effective in binding the gravel to each other. The viscosity of the mixture increased significantly, making the spraying operation difficult and making it impossible to obtain uniform filling.

As a result of various experiments, it has been found that the appropriate amount to be added is about 20 to about 50% by weight relative to the asphalt emulsion.

By adding within this range, it is possible to smoothly spray and inject the asphalt liquid with an appropriately high concentration and viscosity, and also to bring about sufficient accumulation of asphalt in the voids between the gravels, resulting in remarkable results in binding between the gravels.

Generally, the diameter of bituminous powder is usually 250-1500 microns, and the diameter of emulsified asphalt particles is 1-5 microns, and the liquid using these together has a viscosity that is good for workability and coats the surface of gravel. The amount of bituminous material increases, which strengthens the bond between gravels and has a great effect in filling the voids between gravels.

Bituminous powder is patent No. 651013 and No. 826981
The best method is by issue, but what about other methods? Rubber blown asphalt powder or/and rubber blown asphalt powder.

Further, as the asphalt emulsion, a cationic emulsion is preferable.

The reason for this is that since the asphalt fine particles in the emulsion are positively charged, they electrically adhere to the surface of gravel, which is generally negatively charged, and the adhesion effect increases accordingly.
Further, the emulsion tends to decompose easily and dry quickly, which is preferable.

The optimum bituminous material has a softening point of 70 to 90°C, which has the effect of softening the bituminous material in the summer and maintaining mutual bonding of gravel for many years.

The aqueous bitumen compound solution described above can also be spread so that after drying, the bituminous material layer forms a suitably thick and connected coating layer on the surface of the gravel layer 5.

Also, a thin layer of vaginal fluid may be applied to the surface of the waterproof layer before laying the gravel.

Next, the properties of the solidified product obtained by evaporating water from the preparation solution according to the present invention (a mixed solution of 100 parts by weight of asphalt emulsion and 40 parts by weight of blown asphalt powder with a penetration of 20 to 30) were compared to the asphalt emulsion. The results of a comparison test with the properties of solidified products obtained in the same manner are shown in the table below.

As is clear from the above, when using the preparation according to the present invention, that is, an asphalt emulsion to which the bituminous powder is added, the softening point of the solidified product is higher than that when the asphalt emulsion is spread on the ground. It is recognized that there is little change in hardness due to temperature changes, and it is stable against changes in temperature.

In addition, in order to impart appropriate rubber properties to the protective layer, 3 rubber latex is added to the asphalt emulsion and bituminous powder.
~20% weight can be achieved.

According to this, it is possible to form a protective layer that binds the gravel particles even more strongly.

As described above, according to the present invention, 20 to 50 parts by weight of bituminous powder is added to the asphalt emulsion on a gravel layer laid on the surface of a waterproof layer such as an asphalt waterproof layer to appropriately increase the asphalt content and viscosity. The prepared solution is spread and injected into the gaps between the gravel, so that the injection and filling work can be carried out smoothly and quickly, and a sufficient amount of the dried and solidified solution can be used to ensure that the gaps between the gravel are filled. This improves the binding between gravels and creates a dense holding layer, and due to the addition of bituminous powder, it is extremely stable compared to the dry solidified product, and is good for waterproofing layers. This has the effect of providing a protective protective layer.

[Brief explanation of the drawing]

The drawing is a cross-sectional diagram of a part of the protective pressing layer of the waterproof layer formed by the construction method of the present invention. 1... Concrete slab on the roof, 2...
... Waterproof layer, 3 ... Gravel, 4 ... Void, 5 ... Dried solidified product of prepared liquid, 6 ... Protective pressing layer.

Claims (1)

[Claims] 1. Lay out a layer of gravel on the top of the waterproof layer stretched over the roof of a building, and sprinkle a prepared solution containing 20 to 50 parts by weight of bituminous powder to 100 parts by weight of asphalt emulsion onto this gravel layer. A method of constructing a protective strip for a rooftop waterproof layer, which comprises injecting and filling the gaps between gravel on the upper surface of the waterproof layer, and then drying and solidifying it.