Static structures (e.g. – buildings) – Disparate sheet lamina between exposed surfaces of wall,...
Reexamination Certificate
1999-04-07
2002-10-08
Stephan, Beth A. (Department: 3635)
Static structures (e.g., buildings)
Disparate sheet lamina between exposed surfaces of wall,...
C052S409000, C052S745190, C052S746100
Reexamination Certificate
active
06460304
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hybrid waterproofing structure which is used for preventing water leak on a housetop or roof, and a construction method therefor, and more particularly, to a hybrid waterproofing structure and a construction method therefor, in which merits of an asphalt sheet-like waterproofing material and a coating waterproofing material are taken and demerits thereof are supplemented.
2. Description of the Related Art
In a conventional asphalt sheet-like waterproofing structure as shown in
FIG. 1
, a plurality of unit asphalt sheets
21
each having a predetermined thickness and width and made of asphalt are laid on the upper surface of a concrete slab layer
10
, in which connection portions “A” between the unit asphalt sheets are superimposed over each other in a 2-layered or 3-layered form. Here, the superimposed connection portions “A” are heated by a torch lamp to be melted and attached to each other. The slab layer
10
and the asphalt sheet
21
are attached to each other with an adhesive material. Here, a reference numeral
11
denotes an adhesive material layer.
The above-described asphalt sheet-like waterproofing structure has a waterproofing effect to a degree, since the connection portions “A” superimposed between the asphalt sheets are heated by the torch lamp to be melted and attached to each other. However, such the thermal heating of the connection portions “A” may cause them not to be uniformly attached to each other. That is, since holes may be produced due to excessive heating by the torch lamp, in the connection portions where the asphalt sheets are attached to each other, or complete attachment may not be achieved due to weak heating by the torch lamp, water leak can occur from the connection portions.
Thus, the above asphalt sheet-like waterproofing structure has the following disadvantages.
(1) Since connection portions overlaid between a plurality of unit asphalt sheets are deteriorated due to excessive heating or are not partly fused due to weak heating, water leak can occur therein.
(2) Since additional equipment such as a torch lamp, a gas vessel, a gas tube, etc., are required for heating, melting and attaching connection portions, fire or burn can take place. Accordingly, an efficiency of work is lowered.
Meanwhile, there is a polyurethane coating waterproofing structure as another waterproofing technique besides the above-described asphalt sheet-like waterproofing structure, in which only polyurethane is used to prevent water leak. In the polyurethane coating waterproofing structure as shown in
FIG. 2
, liquid-phase polyurethane is primarily coated on the upper surface of a concrete slab layer
10
to form a first polyurethane layer
31
. After about
24
hours has elapsed, a second polyurethane layer
32
is formed on the first polyurethane layer
31
by the same method as the first layer. Then, after 24 hours has further elapsed, a third polyurethane layer is formed on the second polyurethane layer
32
, to thereby complete the polyurethane coating waterproofing structure. Here, polyurethane is hardened at the normal temperature, which is called a cool hardening method. In this case, it is common that an adhesive layer
11
exists between the first polyurethane layer
31
and the slab layer
10
.
The above polyurethane coating waterproofing structure has excellent properties and remarkable merits as a waterproofing material since the polyurethane waterproofing layer is formed without having connection portions and a cool hardening method reacted at the normal temperature is used.
However, the above polyurethane coating waterproofing structure has the following disadvantages.
(1) Since first, second and third polyurethane layers need hardening times when a waterproofing layer is formed in a predetermined thickness or more, a construction time is lengthy.
(2) When the upper surface of a concrete slab layer
10
is uneven, more urethane resin is collected in groove portions to thereby form a thicker layer, and less urethane resin is collected in protruding portions to thereby form a thinner layer.
(3) Bubbling or swelling can occur due to vapor pressure of water contained in the concrete in the polyurethane coating waterproofing structure before polyurethane has been hardened.
In particular, the above phenomena frequently occurs in summer time. Thus, when a water containing ratio in the concrete is 8% or more, the polyurethane coating waterproofing structure is prohibited in principle.
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide a hybrid waterproofing structure and a waterproof construction method therefor, in which an asphalt sheet-like waterproofing structure (or method) and a coating waterproofing structure (or method) are hybridized, to thereby take merits of the two structures and supplement demerits thereof.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The waterproofing structure and the waterproof construction method according to the present invention have the following features.
(1) An adhesive force between an asphalt sheet and a coating waterproofing layer is enhanced to maximize a waterproofing reliability.
(2) A complete cool hardening method is used without using any thermal source when a waterproofing structure is fabricated.
(3) Any connection portions do not exist in the hybrid waterproofing structure.
(4) An asphalt sheet functions as the basis of a coating waterproofing layer. Thus, the coating waterproofing layer is not affected by a water containing condition of the concrete.
(5) A nonwoven fabric of a predetermined thickness on the upper surface of an asphalt sheet absorbs and hardens a coating waterproofing material. Accordingly, a coating waterproofing layer is coated in constant thickness and the nonwoven fabric reinforces the coating waterproofing layer as a reinforcing material.
(6) The whole construction is quickly and simply accomplished.
To accomplish the above object of the present invention, there is provided a hybrid waterproofing structure comprising: a plurality of waterproof sheets, each having a predetermined thickness and width and fabricated in the form of rolls in which the edges of connection portions keep a predetermined distance from each other, when the waterproof sheets are adhered on the upper surface of a slab layer, the waterproof sheet comprising an asphalt sheet formed of asphalt and a first nonwoven fabric in which hair roots produced on the bottom of the nonwoven fabric are implanted into the upper surface of the asphalt sheet, and hair trunks produced on the top of the nonwoven fabric are protruded externally; and a coating waterproofing layer formed by coating liquid-phase coating waterproofing material on the upper surface of the waterproof sheet.
To accomplish the above object of the present invention, there is provided a waterproofing construction method comprising the steps of: forming an adhesive material layer by applying an adhesive material to the upper surface of a slab layer in order to enhance an adhesive force; laying a plurality of waterproof sheets, each having a predetermined thickness and width in which the edges of connection portions keep a predetermined distance from each other, when the waterproof sheets are laid on the upper surface of the adhesive layer, where hair roots produced on the bottom of a nonwoven fabric are implanted and fused into the upper surface of an asphalt sheet, and hair trunks produced on the top of the nonwoven fabric are protruded externally; forming a coating waterproofing layer by coating liquid-phase coating waterproofing material on the upper surface of th
Stephan Beth A.
Vigil Thomas R.
LandOfFree
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