JPS63110349A - Waterproof construction method - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an improvement in a waterproofing method in which a cement-based finishing layer (tm) of concrete or the like is applied on a waterproof layer. The present invention relates to the above-mentioned waterproofing method, which prevents the occurrence of cracks during drying and hardening of the finishing press layer and the accompanying destruction of the waterproofing member 13.

(Conventional technology) Conventionally, as shown in Figure 4, the roof waterproofing method for steel-framed or reinforced concrete buildings has been to apply asphalt, a waterproof sheet, or a resin-based coating on the concrete roof (substrate) (1). Forming a waterproof layer (2) with waterproof material,
Furthermore, a method of pouring concrete (Q) as a pressing layer is generally used.

In this case, the finishing press layer (Conc IJ-) 71)
The lower surface is in contact with the waterproof layer, and the upper surface is exposed to the outside air, each being placed under a different atmosphere. Therefore, after the finishing presser layer is cast, the degree of drying shrinkage differs due to the difference in the drying conditions on the upper and lower surfaces, resulting in cracks in the finishing presser layer, and as a result, the waterproofing that follows the finish presser layer. This often results in layer destruction. Conventionally, polyethylene film, asphalt felt, etc. were laid as an insulating layer between the waterproof layer (2) and the finishing presser layer (4), and cracks in the finishing presser layer due to the degree of drying shrinkage occurred. A method has been adopted to prevent the cedar J from reaching the waterproof j4. According to this method, it is possible to completely prevent the hard berries of the waterproof jti from reaching the upper and lower surfaces of the finishing press layer. The fundamental problem of cracks occurring in the layer due to differences in the degree of drying shrinkage has not yet been solved.

(Problems to be Solved by the Invention) In view of the problems of the prior art as described above, the present inventors have
When constructing a cement-based finish layer such as concrete on a waterproof layer, the occurrence of cracks when the finish layer dries and hardens is suppressed, and therefore, naturally, cracks are prevented from occurring during the destruction of the waterproof layer caused by cracks. As a result of extensive research in order to provide an improved method, the present invention has been completed.

(Means for Solving the Problems) That is, in the waterproofing method of the present invention, which consists of constructing a waterproof layer on the base surface and then a cement-based finish layer, the waterproof layer is applied before the construction of the finish layer. This construction method is characterized in that several layers of nonwoven fabric are placed on the surface, and the nonwoven fabric is maintained in communication with the outside air until at least the completion of the construction of the finishing presser layer, and the moisture in the nonwoven fabric is dissipated to the outside air.

EMBODIMENT OF THE INVENTION Hereinafter, the waterproofing method of this invention is demonstrated according to the drawing which shows one Example.

FIG. 1 is a partial cross-sectional view showing an example of a construction in which the waterproofing method of the present invention is applied to the roof of a building, in which (1) is a concrete base and (2) is a waterproof sheet applied to the base. It is a waterproof layer.

In the method of the present invention, a cement-based finish presser Pi (4
), a nonwoven fabric (3) is laid between the waterproof layer (2) and the finishing presser layer (4), and the nonwoven fabric is placed at the through joints of the finishing presser layer as shown in Figure 1. (5, 5'
, 5"...) to communicate with the outside air. By doing this, the concrete and mortar on the finishing foot will be able to absorb moisture from the bottom side when it dries and hardens. Due to the capillary action or water absorption/moisture absorption action of the nonwoven fabric, it moves and diffuses horizontally, and is sequentially dispersed into the outside air through the through joints. As a result, cracks in the finishing press layer due to differences in the degree of drying shrinkage are virtually eliminated.

In the method of the present invention, the nonwoven fabric interposed between the waterproof layer and the finishing presser layer has a certain amount of moisture because it contributes to the horizontal propagation of moisture on the bottom side of the finishing presser layer as described above. It is desirable to have a basis weight and density of a degree or more, and those having a basis weight of 60-4001/m2 and an apparent density of about 0.05 to 0.10 are usually used. In addition, as the material for the nonwoven fabric, considering the effect of alkali from the cement-based finishing layer, a material with excellent alkali resistance, such as polypropyref CR fiber, is preferably used.

From the viewpoint of the above-mentioned moisture propagation function, it is sufficient to simply place this nonwoven fabric on top of the waterproof layer, but if it is partially fixed to the waterproof layer by point adhesion, etc., it is possible to install the finishing presser layer. It has the advantage of being easier. Furthermore, at the joint between the ends of the nonwoven fabric, it is particularly desirable that the ends of the nonwoven fabric overlap each other by 10 cm or more in order to ensure smooth propagation of moisture within the nonwoven fabric layer.

As a means for communicating the nonwoven fabric with the outside air and dissipating the moisture in the nonwoven fabric to the outside air, in the embodiment shown in Fig. 1, through joints in the finishing presser layer are used. A length of about 1 to 8 m, similar to the holding method, is sufficient. Fillers are generally inserted into these penetration joints to prevent direct intrusion of rainwater, etc. during or after construction, but in the present invention, even after inserting the fillers, communication between the nonwoven fabric and the outside air is maintained. In order to maintain the condition, for example, a continuous pore sponge may be used as the filler, as shown in the enlarged cross-sectional view of the through-joint portion shown in FIG. The material of the sponge is preferably one that exhibits stable properties under alkaline conditions due to the finishing press layer, such as polyolefins such as polyethylene and polypropylene.

In the method of the present invention, as a means for communicating the nonwoven fabric with the outside air, in addition to the method using the through joints as described above, for example, as shown in FIG. It is also possible to use the method of making the method, and it is also possible to use these methods in combination.

Furthermore, by using a deaerating pipe, a method of forcibly removing moisture from the nonwoven fabric portion can also be adopted.

In addition, in view of the above-mentioned purpose, the state of communication between the nonwoven fabric and the outside air should be maintained as it is at least until the drying and curing of the finishing press layer is substantially completed, that is, until the completion of the above-mentioned construction. However, it is not necessarily necessary after construction is completed, so in some cases, communicating parts such as through joints may be sealed with a sealant or the like after construction of the finishing presser layer is completed.

Further, in the embodiment shown in Fig. 1, a construction example is given in which a waterproof sheet is used for the waterproof layer (2), but it goes without saying that the layer may be formed by asphalt waterproofing or painted waterproofing. do not have.

(Function) As described above, according to the method of the present invention, in which a non-woven fabric is laid on the upper surface of the waterproof layer in advance and a cement-based finishing layer is constructed by providing penetration joints, etc., Pore water or steam is absorbed by the underlying non-woven fabric and is further transmitted horizontally by capillary action! The air is dispersed into the atmosphere through through joints, etc. without being retained locally, making it possible to dry uniformly over the entire surface of the presser layer. The occurrence of cracks is suppressed, and therefore, naturally, there are no problems such as breakage of the waterproof layer caused by such cracks. Also,
Even if cracks were to occur on the surface of the finishing presser layer due to long-term use, the nonwoven fabric acts as an insulating material and the worst case scenario of cracks spreading to the waterproof layer can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing one line of construction according to the method of the present invention, and FIG. 2 is an enlarged sectional view showing an example of a specific structure of the through joint (5) portion in FIG. 1. FIG. 8 is a partial sectional view showing another construction example using the method of the present invention, and FIG.
The figure is a partial sectional view showing an example of construction using a conventional method. (1)...base layer, (2)...waterproof layer,
(3)...Nonwoven fabric, (4)...Finish presser layer, (5
)...through joint, (6)...sponge. (ゝ-1 Kanebo Kasei Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] In a waterproofing method that consists of constructing a waterproof layer on the base surface and then a cement-based finishing layer, a nonwoven fabric is laid on the surface of the waterproofing layer prior to the construction of the finishing layer, and at least the construction of the finishing layer is completed. A construction method characterized in that the nonwoven fabric is kept in communication with the outside air until then, and the moisture in the nonwoven fabric is dissipated to the outside air.