JP2007321509A - Waterproofed slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproofed slab capable of not only ensuring a waterproof performance but also reducing the thickness of a protective concrete layer. <P>SOLUTION: The waterproofed slab 1 with a treated waterproofing has a concrete member 20 as a lower layer as a skeleton and a pushing concrete-layer member 30 as the upper side of the concrete-layer member 20 as the lower layer and having a thickness from 20 mm to 50 mm. The waterproofed slab 1 further has a waterproof sheet 10 being interposed between the concrete member 20 as the lower layer and the pushing concrete-layer member 30 and having means improving a bond strength between the concrete member 20 as the lower layer and the pushing concrete-layer member 30 on the surface and the rear face. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a waterproof floor slab, and more particularly to a waterproof floor slab in which the thickness of presser concrete or presser mortar is reduced.

  Conventionally, when floor slabs exposed to rainwater on the rooftop are used for parking or walking, a waterproof layer is provided on the floor slab made of reinforced concrete, and the waterproof layer is protected on this waterproof layer. A waterproof floor slab provided with presser concrete and presser mortar is employed (for example, see Patent Document 1). According to such a waterproof floor slab, since a waterproof layer is provided between the floor slab and the presser concrete, even if rainwater or the like is poured onto the presser concrete, the waterproof layer is immersed in the floor slab side. Can be prevented.

Here, in such a waterproof floor slab, the floor slab and the presser concrete are bordered by a waterproof layer interposed therebetween, and when the presser concrete is made thin, a local load load such as a wheel load is applied. In such a case, there is a possibility that a displacement deformation occurs between the presser concrete and the waterproof layer and a crack occurs. If cracking occurs in the presser concrete, the waterproof layer will deteriorate, causing rain leakage. For this reason, conventionally, breakage of the presser concrete was prevented by setting the thickness of the presser concrete to 60 to 80 mm or more.
Japanese Patent Laid-Open No. 5-125801

  However, when the presser concrete is thickened as described above, the weight of the waterproof floor slab increases. For this reason, since the load applied to the beam and the column supporting the waterproof floor slab increases, there is a problem that the size of the beam and the column must be increased, resulting in high cost.

  The present invention has been made in view of the above problems. The object is to provide a waterproof floor slab that can reduce the thickness of the presser concrete.

  The waterproof floor slab of the present invention is a waterproof floor slab that has been waterproofed, and is provided on a lower concrete member that is a casing and on the upper side of the lower concrete member, and has a thickness of 20 mm or more and 50 mm or less. A pressing member made of concrete or mortar, and a waterproof sheet that is interposed between the lower-layer concrete member and the pressing member and has means for increasing adhesion strength between the lower-layer concrete member and the pressing member on the front and back surfaces. It is characterized by that.

  Moreover, in said prevention floor slab, as a means to raise the said adhesion strength, raising | fluffing may be formed in the front and back of the said waterproof sheet, and the said raising | fluffing may be embedded in the pressing member and the lower concrete member. In addition, the lower concrete member may be provided with a fixed layer in which the inorganic fluid hardener is cured at the upper part thereof, and the fixed layer may be cured in a state in which the raised hair has entered.

Further, as means for increasing the adhesion strength, uneven portions may be formed on the front and back surfaces of the waterproof sheet, and the pressing member and the underlying concrete member may be formed so as to enter the recessed portion of the waterproof sheet. . Further, a deck slab may be provided on the lower side of the lower concrete member. Moreover, the fireproof layer which consists of fireproof materials may be provided so that the lower surface of the said deck slab may be covered.
In the waterproof floor slab, the lower layer concrete member may be a reinforced concrete member. Further, a reinforcing bar may be embedded in the pressing member.

  According to the present invention, the waterproof sheet and the pressing member made of concrete or mortar are united by the raised portions provided on the surface of the waterproof sheet. For this reason, even if it reduces the thickness of concrete or mortar, a crack does not arise. Thereby, since the thickness of the pressing member can be reduced, the weight of the waterproof floor slab can be reduced.

Further, the present invention is a method for producing a waterproof floor slab subjected to waterproofing, in which concrete of a lower layer concrete member to be a casing is placed, and the lower layer concrete member and its upper and lower surfaces are placed on the upper and lower surfaces thereof, respectively. A waterproof sheet having means for increasing the adhesion strength with the pressing member made of concrete or mortar provided thereon is installed, and the thickness of the concrete or mortar constituting the pressing member is 20 mm or more and 50 mm or less on the waterproof sheet. It includes a method for producing a waterproof floor slab characterized by being placed so that
The present invention also relates to a waterproofing method for a floor slab, comprising a lower layer concrete member which is a casing, and a presser made of concrete or mortar having a thickness of 20 mm or more and 50 mm or less provided on the upper side of the lower layer concrete member. The floor slab waterproofing method is characterized in that a waterproof sheet having means for increasing the adhesion strength between the lower concrete member and the pressing member is interposed between the member and the front and back surfaces.

  According to the present invention, it is possible to prevent displacement deformation between the presser concrete and the waterproof sheet, and therefore it is possible to improve the proof stress against the cracking load of the presser concrete. For this reason, the thickness of the presser concrete can be reduced, and the weight of the waterproof floor slab can be reduced. Thereby, the diameter of the pillar which supports a waterproof floor slab and a beam fault can be suppressed, and cost can be reduced.

<First Embodiment>
Hereinafter, 1st Embodiment of the waterproof floor slab of this invention is described based on drawing. FIG. 1 is a plan view showing a waterproof floor slab 1 according to the first embodiment. The waterproof floor slab 1 is used as a floor slab such as a roof slab of a building that is exposed to rainwater, and is also a floor slab having a function as a housing for supporting a load load like a floor slab in a parking lot. As shown in FIG. 1, the waterproof floor slab 1 is formed in a rectangular shape in plan view, and is supported by a large beam 2 between columns 4 or a small beam 3 hung between the large beams 2. The inner length of the large beam 2 or the small beam 3 in at least one of the depth direction and the width direction of the waterproof floor slab 1 is set to 350 cm or less (300 cm in this embodiment).

FIG. 2 is a longitudinal sectional view of the waterproof floor slab 1 surrounded by the large beam 2 and the small beam 3 in FIG. As shown in the figure, the waterproof floor slab 1 includes a lower layer concrete member 20, a presser concrete member 30, and a waterproof sheet 10 provided between the lower layer concrete member 20 and the presser concrete member 30. .
When the waterproof floor slab 1 is used as a roof slab, the presser concrete member 30 side of the waterproof floor slab 1 is exposed to rainwater or the like. Even if rainwater enters the presser concrete member 30 due to cracks on its surface, the waterproof floor slab 1 is waterproof. The sheet 10 can prevent the rainwater from entering the lower concrete member 20.

The presser concrete member 30 protects the waterproof sheet 10 by covering the upper surface of the waterproof sheet 10. Since the pressing concrete member 30 uses an aggregate having a diameter of 20 mm or more at the maximum, the pressing concrete member 30 has a thickness of 20 mm or more. In addition, although this embodiment demonstrates the case where the mesh reinforcement is not embed | buried in the presser concrete member 30, in order to prevent that a crack generate | occur | produces on the surface, you may embed a mesh streak in the presser concrete member 30. .
The lower concrete member 20 is composed of a concrete member main body 21, a slab bar 22 embedded in the concrete member main body 21, and a fixed layer 23 provided on the upper part of the concrete member main body 21. The concrete member 20 in the lower layer has a thickness that can support the weight and load capacity of the waterproof floor slab 1 as a structure.

  FIG. 3 is an enlarged cross-sectional view of the waterproof sheet 10. As shown in the figure, the waterproof sheet 10 includes, for example, a sheet member main body 12 that is a sheet-like member made of resin such as ethylene vinyl acetate resin, and a plurality of raised hairs 11 on the front and back surfaces of the sheet member main body 12. As such a waterproof sheet 10, the Sanei sheet | seat etc. of Hasegawa Chemical Industry Co., Ltd. can be used, for example. Resin such as ethylene vinyl acetate resin used as the waterproof sheet 10 has elasticity, and when the waterproof floor slab 1 is deformed, the waterproof sheet 10 expands and contracts following the deformation of the waterproof floor slab 1. Therefore, it is possible to prevent the waterproof sheet 10 from being damaged.

Returning to FIG. 2, the fixed layer 23 of the lower concrete member 20 is obtained by curing a cement paste 34 that is an inorganic curable fluidizing agent. The cement paste 34 is cured in a state in which the raised portions 11 on the surface of the waterproof sheet 10 are surrounded without any gaps. For this reason, the fixing layer 23 can firmly fix the raised hairs 11 embedded therein. Similarly, since the presser concrete member 30 enters between the raised hairs 11 on the surface of the waterproof sheet 10 and is cured in a state surrounding the raised hairs 11, the presser concrete member 30 firmly fixes the raised hairs 11. can do.
With this configuration, the presser concrete member 30 is firmly held by the lower concrete member 20 via the waterproof sheet 10. For this reason, even if the wheel load acts on the presser concrete member 30, no separation occurs between the waterproof sheet 10, the presser concrete member 30 and the lower concrete member 20, and the presser concrete member 30 and the lower concrete member Therefore, it is possible to prevent the displacement deformation with respect to 20, and to improve the resistance to cracking of the presser concrete member 30.

  In the conventional waterproof floor slab, the thickness of the presser concrete member is set to 60 to 80 mm or more so that cracking does not occur in the presser concrete member even if the displacement deformation occurs. On the other hand, according to the waterproof floor slab of the present embodiment, it is possible to prevent skin separation due to the loaded load, and thus the thickness of the presser concrete member 30 can be suppressed to 50 mm or less. Thereby, the weight of the waterproof slab 1 is reduced, and the diameter of the column supporting the waterproof slab 1 and the size of the beam can be suppressed, so that the cost can be reduced.

Second Embodiment
Next, the waterproof floor slab of the second embodiment of the present invention will be described.
FIG. 4 is a view showing the waterproof floor slab 100 of the second embodiment constructed using the deck slab 40. In addition, the same code | symbol is attached | subjected to the component similar to FIG. In addition, in the method of constructing the floor slab using the deck slab 40, since the inter-beam length is determined by the tensile strength that the deck slab 40 can bear, at least one of the width direction and the depth direction is determined. It is preferable to apply to a floor slab whose inner beam length is about 350 mm or less.

As shown in FIG. 4, the waterproof floor slab 100 includes a deck slab 40, a lower concrete member 20, a presser concrete member 30, and a waterproof sheet 10 disposed between the lower concrete member 20 and the presser concrete member 30. With. Similar to the waterproof floor slab 1, a sheet-like member made of ethylene vinyl acetate resin having raised portions 11 on the front and rear surfaces is used as the waterproof sheet 10.
The presser concrete member 30 is provided to protect the waterproof sheet 10 as in the first embodiment, and the thickness thereof is 20 mm or more and 50 mm or less. In addition, although this embodiment demonstrates the case where the mesh reinforcement is not embed | buried in the presser concrete member 30, you may embed a mesh streak in the presser concrete member 30. FIG.

  The lower concrete member 20 is composed of a concrete member main body 21 and a fixed layer 23 formed by solidifying cement paste 34 provided thereon. Slab bars 32 are embedded in the lower concrete member main body 21 so as to extend horizontally and vertically. The deck slab 40 is made of a steel member and can bear a tensile stress that should be borne by the slab reinforcement 32 embedded in the lower concrete member main body 31. For this reason, the waterproof floor slab 100 using the deck slab 40 may have a configuration in which the slab muscle 32 is omitted as shown in FIG.

  As shown in FIG. 4, when the slab bar 32 is provided in the lower concrete member 20, the slab bar 32 bears a tensile stress even when the deck slab 40 is weakened due to heat during a fire or the like. Therefore, the fire resistance can be improved.

  Moreover, you may provide a fireproof layer so that the lower surface of the deck slab 40 may be covered. The fire-resistant layer is made of a method of spraying a fire-resistant coating material made of rock wool or ceramic material, a method of attaching a molded plate such as ALC having heat insulation, a method of applying a foam-resistant fire-resistant paint, or a foam-resistant fire-resistant sheet. It can be formed by a method of attaching. By providing a fireproof layer on the lower surface of the deck slab 20, the fireproof performance of the waterproof floor slab 100 can be improved even if the slab reinforcement 32 is omitted.

Next, the construction procedure of such a waterproof floor slab 100 will be described.
First, the deck slab 40 is arranged, and the deck slab 40 is used as a mold, and concrete constituting the lower-layer concrete member body 21 is placed up to a height corresponding to the waterproof sheet 10. Next, after the concrete 21 is hardened, a fluid cement paste 34 constituting the fixing layer 23 is applied to the upper surface to a predetermined thickness. Since the cement paste 34 is an inorganic fluid hardener, the cement paste 34 can be applied without being separated from the surface moisture even if the surface of the cast-in-place concrete constituting the concrete member body 21 is wet. Next, before the cement paste 34 hardens, the waterproof sheet 10 is pasted on the upper side of the cement paste 34. At this time, since the cement paste 34 has fluidity, it can enter the gap between the raised portions 11 of the waterproof sheet 10 without any gap. After the cement paste 34 is hardened, concrete constituting the presser concrete member 30 is placed on the waterproof sheet 10. At this time, as in the case where the waterproof sheet 10 is pasted on the upper side of the cement paste 34, the concrete enters the gaps of the raised portions 11 of the waterproof sheet 10 without any gaps. As the concrete hardens, the waterproof floor slab 100 is constructed.

  According to the waterproof floor slab 100 of the present embodiment, the thickness of the presser concrete member 30 can be reduced, as in the first embodiment, and therefore the diameter of the column supporting the waterproof floor slab 100 and the beam fault are suppressed. Therefore, the cost can be reduced.

  In addition, if the lower layer concrete 20 has not been sufficiently dried, there has been a problem that the waterproof layer swells. Therefore, after curing of the lower layer concrete 20, it is necessary to leave it for 3 to 4 weeks or more as a curing period, for example. However, since the cement paste 34 is used to fix the waterproof sheet 10 to the lower concrete layer 20, even after the concrete constituting the lower concrete is placed, the concrete content is high in about 4 to 5 days. Cement paste can be applied, and the construction period can be shortened.

In this embodiment, the waterproof sheet 10 is protected by the presser concrete member 30. However, the present invention is not limited thereto, and the waterproof sheet can be protected by providing the presser mortar member so as to cover the upper surface of the waterproof sheet. Good.
In the present embodiment, a sheet member made of ethylene vinyl acetate resin is used as the waterproof sheet 10, but this is not the only case. Interfacial adhesion can be secured, and it can expand and contract like a synthetic polymer roofing sheet. Any sheet member having the property may be used.

  Further, in this embodiment, in order to integrate the presser concrete member 30 and the lower concrete member 20 and the waterproof sheet 10, the front and back surfaces of the waterproof sheet 10 are provided with raised brushes. A waterproof sheet having a surface embossed (processing to provide an uneven portion) or the like may be used to form the presser concrete member and the lower concrete member so as to enter the recess. According to such a configuration, the deformation can be prevented by the concavo-convex portion, and the same effect can be obtained.

  Moreover, in order to adhere | attach the concrete member and waterproof sheet of a lower layer, although the cement paste was used, it should just be an inorganic curable fluidity agent like a polymer cement, mortar, etc., for example. Also, the concrete is not limited to general concrete, and SFRC (steel fiber reinforced concrete) can also be used.

Here, by using a waterproof sheet having a brushed surface as a waterproof layer, it was confirmed by experiments that it is possible to prevent skin separation between the presser concrete and the waterproof sheet, which is a cause of cracking in the presser concrete. This will be described below.
6 is a view showing an example (test body NO. 3) of a test body 200 simulating a waterproof floor slab used in this experiment, (A) is a vertical sectional view in the short side direction, and (B) is a long view. It is a vertical sectional view of a side direction, and (C) is a horizontal sectional view.

  The test body is a waterproof floor slab (NO. 1) in which a waterproof sheet 10 having raised hair is embedded between the presser concrete 30 and the lower concrete 20 of the present embodiment, the waterproof sheet 10 is not embedded, and the presser concrete 30 and the lower layer are not embedded. A floor slab (NO.2) in which the concrete 20 is integrated as a concrete, a waterproof sheet 10 having raised hairs is embedded between the presser concrete 30 and the lower concrete 20, and a release agent is applied to the front and back surfaces of the waterproof sheet 10. Three types of waterproof floor slab (NO.3) were used. Specimen NO. 3, since a release material is applied to the front and back surfaces of the waterproof sheet 10, skin separation easily occurs between the waterproof sheet 10, the presser concrete 30, and the underlying concrete 20.

  A super E deck (EZ75-1.2, thickness 80 mm) manufactured by Nippon Steel & Construction Materials Co., Ltd. was used as the deck plate 40 for each test body. In addition, the specimen NO. 1, NO. As the waterproof sheet 10 of No. 3, a 5 mm thick San-A sheet manufactured by Hasegawa Chemical Co., Ltd. was used. This sane sheet is a sheet member made of ethylene vinyl acetate resin having raised surfaces on the front and back surfaces, and the presser concrete 30 and the underlying concrete 20 are in a state in which the raised surfaces provided on the front and back surfaces of the waterproof sheet 10 have entered. It is cured.

The lower concrete 20 is 30 mm thick from the top of the deck plate 40, and the presser concrete 30 is 50 mm thick. Further, in the presser concrete 30, welded wire nets (so-called mesh bars) 35 having an interval of 150 mm in length and width and a reinforcing bar diameter of 6 mm were embedded at a depth of 20 mm from the upper surface of the waterproof floor slab 200. As the concrete, both the pre-cast (underlayer) concrete 20 and the post-cast (presser) concrete 30 were used with a nominal strength of 21 N / mm ² .

Further, as shown in FIG. 3, studs 210 are embedded in the vicinity of the support members 220 located at both ends so as to protrude from the upper and lower surfaces of the waterproof sheet 10 and straddle the presser concrete 30 and the lower concrete 20. The stud 210 can transmit the shear load when the shear load is not sufficiently transmitted between the presser concrete 30, the underlying concrete 20 and the waterproof sheet 10.
Each test specimen was loaded by simple support trisection loading, and the relationship between the loaded load and the deflection at the center of the specimen was examined.

  FIG. 7 is a graph showing a load-deflection curve of each specimen. As shown in the figure, in each specimen, the deflection increased as the load increased to about 60 kN or less, and when the load reached about 60 kN, the load decreased rapidly. This is due to the occurrence of displacement deformation at the interface between the deck plate 40 and the underlying concrete 20.

  In addition, the specimen NO. The yield loads of 1 to 3 were 63.54 kN, 61 kN, and 45.6 kN, respectively. As described above, the waterproof floor slab (test body NO. 3) in which the release material is applied to the front and back surfaces of the waterproof sheet 10 is provided with the single-piece floor slab (test body NO. 2) even though the stud 210 is provided. Shear strength is reduced compared to. This is because the release material is applied to the front and back surfaces of the waterproof sheet 10, so that skin separation occurs between the waterproof sheet 10 and the presser concrete 30 or the lower concrete 20, and the presser concrete 30 and the lower concrete 20 are separated. This is because a displacement deformation has occurred.

  On the other hand, the waterproof floor slab (that is, the test body No. 1) of the present embodiment has substantially the same load resistance as that of the integrally-struck floor slab (test body NO. 2). This is because, according to the waterproof floor slab of the present embodiment, the raised portions provided on the front and back surfaces of the waterproof sheet 10 are firmly held by the presser concrete 30 and the lower concrete 20 to reach a yield load. Even when a load is applied, separation of the waterproof sheet 10 from the presser concrete 30 and the lower concrete 20 does not occur, and displacement deformation between the presser concrete 30 and the lower concrete 20 is prevented. Because it can.

  As described above, by using the waterproof sheet 10 made of ethylene vinyl acetate having a raised surface on the surface, the waterproof sheet 10, the presser concrete 30, and the underlying concrete that cause cracks in the presser concrete 30 are used. It was confirmed that it was possible to prevent skin separation from occurring.

It is a top view which shows the waterproof floor slab of 1st Embodiment. It is a longitudinal cross-sectional view of the waterproof floor slab of 1st Embodiment. It is sectional drawing of a waterproof sheet. It is sectional drawing of the waterproof floor slab constructed | assembled using the deck slab of 2nd Embodiment. It is sectional drawing of the deck slab of 2nd Embodiment which abbreviate | omitted the slab muscle. It is a figure which shows the test body which imitated the waterproof floor slab, (A) is a short side direction sectional view, (B) is a long side direction sectional view, (C) is a horizontal direction sectional view. It is a figure which shows the load-deflection curve of each test body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waterproof floor slab 2 Large beam 3 Small beam 4 Pillar 10 Waterproof sheet (waterproof layer) 11 Brushed 12 Sheet member main body 20 Presser concrete 21, 31 Concrete member main body 22 Slab reinforcement 23 Adhesion layer 30 Lower concrete 32 Slab reinforcement 34 Cement paste 40 Deck slab 100 Waterproof floor slab

Claims (10)

A waterproof floor slab with waterproofing,
A concrete member in the lower layer that is a skeleton;
A pressing member made of concrete or mortar having a thickness of 20 mm or more and 50 mm or less, which is provided on the upper side of the lower concrete member;
A waterproof floor slab comprising a waterproof sheet interposed between the lower concrete member and the presser member and having means for increasing adhesion strength between the lower concrete member and the presser member on the front and back surfaces. The waterproof floor slab according to claim 1,
As means for increasing the adhesion strength,
Brushed is formed on the front and back of the waterproof sheet,
The waterproof floor slab, wherein the raising is embedded in the presser member and a lower concrete member. The waterproof floor slab according to claim 2,
The lower concrete member is on the top,
A fixed layer in which an inorganic fluid curing agent is cured,
The waterproof floor slab, wherein the fixing layer is hardened in a state where the raised hairs enter the inside thereof. The waterproof floor slab according to claim 1,
As means for increasing the adhesion strength,
Concave and convex portions are formed on the front and back surfaces of the waterproof sheet,
A waterproof floor slab, wherein the pressing member and a lower concrete member are formed so as to enter a recess of the waterproof sheet. The waterproof floor slab according to any one of claims 1 to 4,
A waterproof floor slab comprising a deck slab below the lower concrete member. The waterproof floor slab according to claim 5,
A waterproof floor slab comprising a fireproof layer made of a fireproof material so as to cover a lower surface of the deck slab. The waterproof floor slab according to claim 1,
The waterproof floor slab, wherein the lower concrete member is a reinforced concrete member. The waterproof floor slab according to claim 1,
A waterproof floor slab in which a reinforcing bar is embedded in the pressing member. A method of manufacturing a waterproof floor slab that has been waterproofed,
A waterproof sheet having a means for increasing the adhesion strength between a lower layer concrete member and a pressing member made of concrete or mortar provided on the upper and lower surfaces of the concrete member of the lower layer concrete member serving as a casing. And a concrete or mortar constituting the pressing member is placed on the waterproof sheet so that the thickness is 20 mm or more and 50 mm or less. A floor slab waterproofing method between a lower layer concrete member which is a casing and a pressing member made of concrete or mortar having a thickness of 20 mm or more and 50 mm or less provided on the upper side of the lower layer concrete member, A waterproofing method for a floor slab, comprising a waterproof sheet having means for increasing adhesion strength between the lower layer concrete member and the pressing member on the front and back surfaces.

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