JP4098993B2 - Waterproof structure for floor slab and waterproof construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof structure for floor slabs in which a waterproof layer is disposed on a floor slab such as a road and a bridge, and asphalt pavement thereon, and a waterproof construction method using the waterproof structure.
[0002]
[Prior art]
Floor slabs such as roads and bridges are affected by various deterioration factors in the usage environment. Rainwater is recognized as a factor that has a large impact on road and bridge decks. Wet floor slabs are known to have a fatigue life of about 1/100 that of dry slabs, and water greatly affects the fatigue life of floor slabs. This is an effective means for maintaining durability.
[0003]
A waterproofing method in which a waterproof layer made of a waterproof coating material such as urethane resin is disposed on a floor slab, and then paved with an asphalt mixture has attracted attention. However, since the asphalt mixture has insufficient adhesion to the waterproof layer, there is a possibility that defects such as cracks may occur on the road surface. In order to prevent such defects, a method of applying an asphalt emulsion on a waterproof layer has been generally performed. However, the asphalt emulsion has problems of insufficient adhesion to the waterproof layer and takes a long time to dry and solidify.
[0004]
There is also a method of using a liquid adhesive such as an epoxy resin for bonding the waterproof layer and the asphalt mixture. However, when a construction vehicle such as a truck passes, there is a possibility that a problem may occur that the adhesive adheres to the tire before the adhesive is cured. In addition, when paving with an asphalt mixture after the adhesive is cured, the waterproof layer and the asphalt mixture may not be sufficiently bonded.
[0005]
Japanese Patent Laid-Open No. 9-21113 proposes a method in which a thermoplastic resin granular material is dispersed on a waterproof layer and paved using a heated asphalt mixture. However, it is difficult to uniformly disperse the thermoplastic resin particles, and the synthetic resin particles dispersed by the wind may be scattered, resulting in the absence of the synthetic resin particles and the possibility of partially insufficient adhesion. There is.
[0006]
In addition, there is a method in which a thermoplastic resin is heated and melted with a hot melt applicator before being paved with a heated asphalt mixture, and then applied onto a waterproof layer and fixed, but equipment such as a hot melt applicator is required at each construction site. This increases the cost and is not preferable.
[0007]
[Problems to be solved by the invention]
That is, the object of the present invention is to provide a waterproof structure for floor slabs that has low defects and good workability without realizing the disadvantages of the prior art, realizing good adhesion between the waterproof layer and the asphalt mixture over the entire construction surface. And providing a waterproof construction method with a waterproof structure.
[0008]
[Means for Solving the Problems]
The former of this subject is a waterproof layer; a sheet made of a thermoplastic resin made of a thermoplastic resin having a softening point of 60 to 150 ° C., or a sheet having the above-mentioned thermoplastic resin attached thereto or containing the above-mentioned thermoplastic resin. And a floor slab waterproof structure in which an asphalt mixture layer is placed on the floor slab in turn.
Further, the latter problem includes a step of disposing a waterproof layer on the floor slab, a step of disposing a sheet of thermoplastic resin or a sheet of thermoplastic resin attached to the waterproof layer or containing the thermoplastic resin, and It has been solved by a waterproof construction method for floor slabs, comprising a step of paving with a heated asphalt mixture, characterized in that the thermoplastic resin used has a softening point of 60-150 ° C.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be specifically described below. As shown in FIG. 1, the waterproof structure 1 for floor slabs of the present invention has a waterproof layer 3, a thermoplastic resin sheet-like material or a thermoplastic resin attached on the floor slab 2, or contains a thermoplastic resin. It consists of the structure which provided the sheet-like material 4 and the layer 5 of the asphalt mixture in order.
[0010]
1 shows one embodiment of the waterproof construction method of the present invention. First, it is preferable to apply an epoxy resin, a urethane resin or the like on the floor slab 2 as a primer. It is preferable to disperse aggregate particles such as silica sand at the time of applying the primer so that the waterproof layer 3 is not easily displaced from the floor slab 2.
[0011]
Next, the waterproof layer 3 is applied on the primer. The waterproof layer 3 used in the present invention is commonly used in the industry. For example, a resin such as a polyurethane resin, an acrylic resin, an acrylic urethane resin, a polyurea resin, or a chloroprene resin can be used.
The waterproof layer 3 can be applied by spray coating, brush coating, roll coating, or the like.
[0012]
Subsequently, the sheet-like material 4 is disposed on the waterproof layer 3. The used thermoplastic resin has a softening point of 60 to 150 ° C., and the sheet-like material 4 used in the present invention is made of a thermoplastic resin sheet-like material or thermoplastic resin that has good adhesion to the waterproof layer during construction. Non-thermoplastic fibers (polypropylene) made of sheet-like material with attached or thermoplastic resin, such as woven fabrics, knitted fabrics or non-woven fabrics made only of thermoplastic resin fibers or blended fibers mixed with a relatively large amount of thermoplastic fibers; Fibers or cellulose fibers) or woven fabrics, knitted fabrics or non-woven fabrics made of thermoplastic fibers coated or impregnated with thermoplastic resin; contain thermoplastic resin fibers and / or non-thermoplastic fibers or There are films that are not contained exclusively or mainly made of thermoplastic resins. The thermoplastic resin or thermoplastic resin fiber used in the present invention is a polyolefin, for example, a high density polyethylene, a polyester resin, a polyamide resin, a polyacrylic resin, a synthetic resin such as a vinyl chloride resin, or a fiber made thereof. Preferred are those made of polyester resin, polyamide resin, polyacrylic resin, and vinyl chloride resin, particularly preferably polyamide resin. The non-thermoplastic fiber referred to in the present invention is a fiber made of a material that is not melted by the heat of heated asphalt, and it is effective to use it when particularly strong reinforcement is desired for the waterproof layer. The types are inorganic fibers such as ceramic fibers; synthetic resin fibers such as polypropylene fibers and cellulose fibers; natural fibers such as cotton and hemp.
A film-like product is advantageous in that it is easy to process and is inexpensive, but a film having a hole of about 2 mm to 50 mm is particularly advantageous in consideration of air permeability during construction.
Woven, knitted fabric and nonwoven fabric having a basis weight that is ^{5g / m 2 ~500g / m 2} , at the time of paving by heating asphalt mixture, a thermoplastic resin through a woven fabric, the gaps of the nonwoven fabric, a waterproof layer and asphalt mixture This is preferable because of good adhesion. Nonwoven fabrics are advantageous in that they are less expensive than woven and knitted fabrics.
[0013]
In addition, the sheet-like product of the present invention is produced from a woven fabric, a knitted fabric or a non-woven fabric made of only a thermoplastic resin fiber or a blended fiber mixed with a relatively large amount of thermoplastic fiber; non-thermoplastic fiber or thermoplastic fiber. Particularly preferred is a sheet-like material obtained by applying or impregnating a thermoplastic resin to a woven fabric, knitted fabric or non-woven fabric.
[0014]
As the thermoplastic resin sheet 4 used in the present invention and the thermoplastic resin used for the coating or impregnation resin, synthetic resins such as polyamide resins and vinyl acetate resins or natural rubber, or asphalt can be used. Polyamide resins are preferred because of their good adhesiveness. Further, these thermoplastic resins may be blended with a resin such as rosin in order to adjust the resin physical properties such as the softening point. Moreover, you may mix | blend additives, such as a wax and a heat stabilizer.
[0015]
Since the thermoplastic resin is in a dry state before paving and needs to melt when paving with a heated asphalt mixture, the softening point is preferably 60 ° C to 150 ° C. A more preferable softening point is 80 ° C to 120 ° C.
[0016]
The adhesion or holding amount of the thermoplastic resin to the sheet-like material is preferably 100 g / m ^{2 to 1} kg / m ² depending on the place of use, the type of resin, etc., and the adhesiveness is less than 100 g / m ^2. When it becomes insufficient and exceeds 1 kg / m ² , the cost is increased, which is not preferable.
[0017]
When a thermoplastic resin is applied to or impregnated into a woven fabric, knitted fabric or nonwoven fabric, for example, it is applied using a normal hot melt applicator having an application nozzle and a heated melting tank, or the woven fabric, knitted fabric or nonwoven fabric is applied to a heated melting bath. Can be impregnated by dipping.
[0018]
After disposing the sheet-like material 4 according to the present invention on the waterproof layer 3, for example, it is paved with an asphalt mixture 5 heated to 150 to 180 ° C. As the asphalt mixture 5 of the present invention, a mixture of ordinary paving asphalt and commonly used aggregate can be used.
[0019]
【The invention's effect】
According to the waterproof structure for floor slabs and the waterproof construction method of the present invention, there is no risk of non-uniformity during spraying, as in the case of using thermoplastic resin particulates, and the waterproof layer on the floor slab and the asphalt mixture Good adhesion is achieved over the entire construction surface. In addition, equipment such as a hot melt applicator is not required for each construction site.
[0020]
In addition, there is no need for drying and solidifying time as in the case of using conventional asphalt emulsion, and there is no risk of the adhesive adhering to the tire when passing through the construction vehicle as in the case of using a liquid adhesive. Is good.
[0021]
[Brief description of the drawings]
FIG. 1 illustrates one embodiment of a waterproof structure for floor slabs according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Waterproof structure of floor slab 2 ... Floor slab 3 ... Waterproof layer 4 ... Sheet-like material 5 ... Asphalt mixture

Claims (2)

Waterproof structure for floor slab in which a woven fabric, a knitted fabric or a nonwoven fabric made of thermoplastic resin fibers having a softening point of 60 to 150 ° C., and an asphalt mixture layer are sequentially arranged on the floor slab. A step of disposing a waterproof layer on the floor slab, a step of disposing a woven fabric, a knitted fabric or a non-woven fabric made of thermoplastic resin fibers having a softening point of 60 to 150 ° C., and a step of paving with a heated asphalt mixture Waterproofing method for floor slabs, including

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