JP7046572B2 - Construction method of waterproof resin sheet, deck plate, deck plate - Google Patents

Description

The present invention relates to a method for constructing a waterproof resin sheet, a deck plate, and a deck plate, and particularly to a technique suitable for construction of a deck plate / synthetic slab structure having excellent waterproofness.

Conventionally, when constructing a building made of concrete, a deck plate method has been adopted in which the deck plate is used as a concrete formwork and also as a structural member.

Here, in the present invention, the deck plate also includes a synthetic slab structure in which the deck plate and the concrete cast therein are combined, as described above.

Construction of deck plates and synthetic slab structures is widely used as structural members such as floors and roofs of modern buildings. The steel plate used for the plate is JIS G3352 4. As described in (Non-Patent Document 1), a galvanized steel plate is used to prevent corrosion.

In the deck plate / synthetic slab structure, zinc steel plates are laid on top of the construction area and concrete is placed. In order to integrate the zinc steel plate and concrete, a shear connector (prevention of slippage) or an anchor (prevention of peeling) is provided (Non-Patent Document 2).

Water / cement ratio is generally around 50% for concrete, and Ca dissolves when cement comes into contact with water. Calcium hydroxide Ca (OH) ₂ is precipitated by Ca ions and shows strong alkalinity as an aqueous solution.
Since several zinc steel plates to be used as deck plates are laid on top of each other, the calcium hydroxide aqueous solution leaks from the joint due to changes over time during and after concrete placement. The leaked alkaline liquid not only poses a risk to workers, but also causes corrosion of the steel plate. Leakage of concrete at the time of placing and due to changes over time will be poor in appearance, and it will be necessary to take measures against leakage to the joints against the occurrence of rust.

Therefore, at the site of this deck plate building, in order to prevent such problems, the waterproof method of filling the gaps between the deck plates with curing tape has been adopted in the deck plate method. Has been done. For example, at a simple construction site, sealing is performed with cloth tape (gum tape) or the like.

In addition, construction work is being carried out to prevent leaks by applying a waterproof material to the joints of the deck plates.

Japanese Unexamined Patent Publication No. 2011-122370 Japanese Unexamined Patent Publication No. 10-292542 Japanese Unexamined Patent Publication No. 5-44222 Jitsukaihei 7-43188 Gazette

JIS G 3352 4. Plating type and symbol Architectural Institute of Japan Various Synthetic Structural Design Guidelines / Explanation Volume 2 Synthetic Slab Structural Design Guidelines for Deck Plates and Concrete / Explanation 125 pages

However, when sealing with cloth tape (gum tape), the tape may be easily peeled off due to dirt on the deck plate or contact with a worker, or it may be damaged by contact with a worker. Therefore, there is a problem that the adhesion to the joint portion of the deck plate is lowered and the waterproof property cannot be maintained.
Moreover, since such a tape does not have resistance to alkalinity, it is insufficient for preventing leakage of an alkaline solution.

Furthermore, depending on the construction site and construction time, the temperature of the deck plate may rise due to exposure to direct sunlight, and in that case, the tape will easily peel off with such tape, so the deck There is also a problem that the adhesion to the joint portion of the plate is lowered and the waterproof property cannot be maintained.

In addition, in the construction that seals the joint part of the deck plate to prevent leakage, the work process increases and the construction time becomes long, so there is a problem that work efficiency is poor and material cost and construction cost are incurred. be. In addition, the conventional waterproof sheet is costly and has no adhesiveness to the concrete to be constructed, and as a result, the deck plate and the concrete are not integrated, which causes a structural problem.

In particular, the deck plate is exposed on the roof and ceiling of the upper floors of large-scale buildings such as stores, parking lots, and distribution centers, which makes it look unattractive. There was a request to do it surely.

The present invention has been made in view of the above circumstances, and is a construction that improves the airtightness at the joint portion of the steel plate of the deck plate / synthetic slab structure by a simple construction work and can easily prevent the leakage of the alkaline liquid. It is an object of the present invention to provide a method and to provide an optimum waterproof resin sheet as a sealing material for the joint portion of the deck plate.

The waterproof resin sheet of the present invention is a thermoplastic resin sheet to be attached to waterproof the joint portion of the steel plate on which concrete is placed.
Easy to tear in one direction in the seat surface
In an alkali resistance test in which it is immersed in a 10% sodium hydroxide aqueous solution at 25 ° C., it has a waterproof layer having a load retention rate of 50% or more and a thickness of 350 μm or less after 28 days.
The above problems were solved by including a cross sheet or a uniaxially stretched film, or by using an EVA resin having a VA content of 15% or more for the waterproof layer.
The waterproof resin sheet of the present invention can have a cutting strength of 140 N / mm or less at a right-angled tear strength.
In the waterproof resin sheet of the present invention, the waterproof layer and the adhesive layer can be laminated .
The waterproof resin sheet of the present invention can have a cutting strength of the waterproof layer at a right-angled tear strength of 85 N / mm or less and a tear elastic modulus of 65 N / mm ² or less .
The waterproof resin sheet of the present invention can have an adhesive force of 5 N / 15 mm or more between the waterproof layer and the adhesive layer.
The waterproof resin sheet of the present invention can have an adhesive force of 5 N / 15 mm or more between the steel plate and the adhesive layer.
The waterproof resin sheet of the present invention can be formed in the form of a tape whose width direction is the direction in which it is easily torn.
The method for constructing the deck plate of the present invention includes a step of attaching the waterproof resin sheet described in any of the above to the joint portion of the steel plate and sealing the joint portion of the steel plate.
It can have a step of pouring concrete onto the steel plate.
In the deck plate of the present invention, the waterproof resin sheet described in any of the above is bonded to the joint portion of the steel plate, so that the adhesive layer and the thermoplastic resin are sequentially laminated on the joint portion of the steel plate. The plastic can be poured onto the steel plate in the state of being sealed.

The waterproof resin sheet of the present invention is a thermoplastic resin sheet to be attached to waterproof the joint portion of the steel plate on which concrete is placed.
Since it is easy to tear in one direction in the sheet surface, the waterproof resin sheet attached to the joint portion of the steel plate during the construction of the deck plate is made of a thermoplastic resin having the above-mentioned characteristics, so that the joint portion is formed. In the pasting process of attaching the waterproof resin sheet to the waterproof resin sheet, it is possible to easily cut the waterproof resin sheet by hand to improve the workability in the attaching process, and when an external force such as contact with a worker acts. Or, even if there is unevenness in the sticking part, the waterproof resin sheet can be easily torn to improve the adhesion, and even when concrete is placed on the sheet, the sheet will come from the joint. It is possible to prevent the deck plate from peeling off, thereby ensuring the waterproof property at the time of constructing the deck plate and maintaining the waterproof property against the subsequent change with time.

The waterproof resin sheet of the present invention has a waterproof layer having a load retention rate of 50% or more and a thickness of 350 μm or less after 28 days in an alkali resistance test of immersing in a 10% sodium hydroxide aqueous solution at 25 ° C. Therefore, in the construction of the deck plate, even if the concrete is exposed to the alkali caused by the concrete at the time of placing the concrete and after the concrete is placed, the waterproof property of the waterproof resin sheet is maintained and the waterproof against the construction of the deck plate. It is possible to ensure the property and maintain the waterproof property against the subsequent change with time. The alkali resistance test conditions shall be in accordance with JIS A 1193.

The waterproof resin sheet of the present invention has a cutting strength of 140 N / mm or less at a right-angled tear strength, which makes it possible to easily cut the waterproof resin sheet by hand in the attaching process. In addition to improving workability, the waterproof resin sheet attached to the joint part is improved in workability in the attachment process, and when an external force such as contact with a worker acts, or at the attachment location. Even if there is unevenness, the waterproof resin sheet can be easily torn to improve the adhesion, and at the same time, even when concrete is placed on the sheet, the sheet may peel off from the joint and the sheet may be separated. It is possible to prevent the deck plate from being damaged, thereby ensuring the waterproof property at the time of constructing the deck plate and maintaining the waterproof property against the subsequent change with time.

Since the waterproof resin sheet of the present invention has the waterproof layer and the adhesive layer laminated, a step such as applying an adhesive is not required, and the waterproof resin sheet can be attached to the joint portion by simply cutting the waterproof resin sheet by hand. It can be attached, and workability in the attaching process can be improved.

By including the cross sheet or the uniaxially stretched film, the waterproof resin sheet of the present invention makes it possible to easily cut the waterproof resin sheet by hand and improves the workability in the sticking process, and the worker can use it. Even when an external force such as abutment acts, or even when the attachment portion has irregularities, the waterproof resin sheet can be easily torn to improve the adhesion.

The waterproof resin sheet of the present invention has a tear strength of 85 N / mm or less at right-angled tear strength of the waterproof layer and a tear elastic modulus of 65 N / mm ² or less, so that the waterproof resin sheet can be obtained by hand. It is possible to easily cut with a cloth to improve workability in the sticking process, and even when an external force such as a worker comes into contact with the plastic is applied, or even if the sticking part has irregularities, it can be easily cut. Adhesion can be improved by tearing the waterproof resin sheet.
The test conditions for the right-angle tear strength are based on JIS K7128-3 (right-angle tear method).

The waterproof resin sheet of the present invention is made of EVA resin having a VA content of 15% or more, so that the waterproof resin sheet can be easily cut by hand and the workability in the sticking process is improved. , And, even if the waterproof resin sheet has sufficient flexibility and an external force such as contact with a worker acts on it, or if there is unevenness in the sticking part, the waterproof resin sheet is easily torn. Therefore, the adhesion can be improved.

The waterproof resin sheet of the present invention has an adhesive force of 5 N / 15 mm or more between the waterproof layer and the adhesive layer, so that the waterproof layer and the adhesive layer can maintain the required adhesive state and are waterproof. It is possible to prevent the layer and the adhesive layer from peeling off.

In the waterproof resin sheet of the present invention, the adhesive force between the steel sheet and the adhesive layer is 5 N / 15 mm or more, so that the waterproof layer and the adhesive layer can maintain the required adhesive state, and the sheet can be formed. It is possible to prevent the sheet from peeling off from the joint and the sheet from being damaged.

Since the waterproof resin sheet of the present invention is formed in the shape of a tape whose width direction is the direction in which it is easily torn, no steps such as adhesive application are required, and the waterproof resin sheet can be simply cut by hand. The length is set to a required value, and the waterproof resin sheet can be attached to the joint portion as much as necessary in that state, and the workability in the attaching process can be improved.
It is also possible to form a roll with the release paper located on the adhesive layer side.

The method for constructing the deck plate of the present invention includes a step of attaching the waterproof resin sheet described in any of the above to the joint portion of the steel plate and sealing the joint portion of the steel plate.
By having the process of pouring concrete onto the steel plate, the workability is improved in the process of attaching the sheet, and the waterproof property of the sheet is improved even if an external force such as a worker comes into contact with the sheet. Even when concrete is placed on the sheet by maintaining it, it is possible to prevent the sheet from peeling from the joint portion and the sheet from being damaged. As a result, it is possible to secure the waterproofness at the time of deck plate construction and maintain the waterproofness against the subsequent change with time in a state where the number of work steps is reduced and the work time is shortened.

In the deck plate of the present invention, the waterproof resin sheet described in any of the above is bonded to the joint portion of the steel plate, so that the adhesive layer and the thermoplastic resin are sequentially laminated on the joint portion of the steel plate. By pouring concrete onto the steel plate in a sealed state, the manufacturing cost should be reduced to ensure waterproofness during deck plate construction, and to maintain waterproofness against subsequent changes over time. Is possible.

In the waterproof resin sheet of the present invention, even when the steel plate has irregularities, the waterproof resin sheet is easily torn in one direction in the sheet surface, so that the waterproof resin sheet (sealing sheet) is peeled off. In addition to being able to prevent this, it is possible to prevent the occurrence of twisting when the waterproof resin sheet is attached, and it is possible to carry out the attachment work without a gap between the waterproof resin sheet and the steel plate. In addition, when the waterproof resin sheet is attached to the recesses of the deck plate, it is easy to tear in one direction in the sheet surface, which improves the handleability of the waterproof resin sheet and allows the sheet to float from the surface of the steel plate. It is possible to prevent a portion from being generated or a portion with poor adhesion from being generated, and to carry out the pasting work without a gap with the steel plate.

Furthermore, since the melting point of the thermoplastic resin used for the waterproof resin sheet is 60 ° C or higher, even if the temperature of the joint part of the steel plate, which is the construction part, rises due to sunlight or other factors during the construction of the deck plate, the sheet It is possible to prevent the resin from peeling off from the joint and damaging the sheet, which ensures waterproofness during deck plate construction even at high temperature construction sites and is waterproof against subsequent changes over time. It becomes possible to maintain sex.

According to the present invention, a waterproof resin sheet is attached to a joint portion of a steel plate by being used as a waterproof sealing method used for a joint portion of steel plates in a construction method relating to construction of a deck plate / synthetic slab structure. By applying the construction, it has an effect that it has alkali resistance, and it is possible to surely prevent the leakage of the calcium hydroxide aqueous solution generated when the concrete is hardened by an inexpensive and easy construction method. It becomes possible.

It is a schematic perspective view which shows the 1st Embodiment of the waterproof resin sheet which concerns on this invention. It is sectional drawing which shows 1st Embodiment of the deck plate which concerns on this invention. It is a perspective view which shows the overlap part of the steel plate in 1st Embodiment of the deck plate which concerns on this invention. It is sectional drawing which shows the sheet sticking process in 1st Embodiment of the construction method of the deck plate which concerns on this invention. It is a flowchart which shows the process in 1st Embodiment of the construction method of the deck plate which concerns on this invention. It is a schematic cross-sectional view which shows the joint part in 2nd Embodiment of the construction method of the deck plate which concerns on this invention. It is a schematic cross-sectional view which shows the joint part in 3rd Embodiment of the construction method of the deck plate which concerns on this invention. It is a perspective view which shows the joint part before attaching the sheet in 4th Embodiment of the construction method of the deck plate which concerns on this invention.

Hereinafter, a first embodiment of a method for constructing a waterproof resin sheet, a deck plate, and a deck plate according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view showing a waterproof resin sheet in the present embodiment, FIG. 2 is a cross-sectional view showing a deck plate in the present embodiment, and FIG. 3 is a stack of steel plates in the deck plate in the present embodiment. It is a perspective view which shows the mating part, FIG. 4 is a cross-sectional view which shows the sheet sticking process in the deck plate construction method in this Embodiment, and FIG. 5 is a process in the deck plate construction method in this Embodiment. In the figure, reference numeral 10 is a deck plate.

In the method of constructing the deck plate according to the present embodiment, a synthetic slab structure (hereinafter referred to as a synthetic slab) in which the deck plate and the concrete placed on the deck plate are appropriately combined to resist bending as a unit is provided. set to target. Here, synthetic slaps are mainly used for floor or roof structures. In the present embodiment, these are collectively referred to as a deck plate, but the construction method and shape of the structure are not particularly limited.

As shown in FIG. 2, the deck plate 10 according to the present embodiment is a corrugated steel plate (galvanized steel plate) in which a plurality of ridges are formed in parallel by making the trapezoid continuous while inverting the unevenness up and down in the cross section. The steel plate) 11 is to be stacked at the end position. In the present embodiment, the superposed portion 12 of the steel plate 11 is positioned at the upper side of the ridge.

The steel plate used for the plate is JIS G3352 4. As described in, zinc-plated steel sheets are used to prevent corrosion, but the method is not limited to hot-dip galvanized steel sheets, hot-dip aluminum-plated steel sheets, stainless steel sheets, and galvanium steel sheets (new). Nittetsu Sumikin Co., Ltd. registered trademark), hot-dip zinc-aluminum-based alloy plated steel sheet, hot-dip zinc-aluminum-magnesium-based alloy plated steel sheet, or surface-treated steel sheet coated with fluororesin or vinyl chloride resin can also be applied.

In the deck plate 10 according to the present embodiment, as shown in FIGS. 2 to 4, a waterproof resin sheet 14 is attached to a joint portion of the stacked steel plates 11, and concrete 15 is cast on all of them. ..

As shown in FIG. 1, the waterproof resin sheet 14 according to the present embodiment is sealed by attaching a waterproof layer 14A having waterproof property to an alkaline liquid of concrete to be cast and the waterproof layer 14A to a joint portion of a steel plate 11. In addition, the adhesive layer 13 having the easy-to-cut property in the width direction in the waterproof layer 14A over the entire length in the vertical direction and the release paper 16 having improved handleability so that the adhesive layer 13 does not adhere unnecessarily are laminated, and these are rolled. It is formed in a shape.

The size of the waterproof resin sheet 14 in the sheet width direction A can be 30 mm or more and 200 mm or less, more preferably 50 mm or more and 100 mm or less. The sheet length dimension may be any longer than the joint portion length dimension of the steel plate 11, and the protrusion dimension from the end portion thereof can be 30 mm or more and 200 mm or less, more preferably 50 mm or more and 100 mm or less.

The waterproof resin sheet 14 is formed by forming a long tape having a substantially uniform width into a roll shape, and is set to be easier to tear in the width direction indicated by the arrow A in FIG. 1 than in the orthogonal direction.
Specifically, the pressure-sensitive adhesive layer 13 is configured such that the cloth sheet is sandwiched between the pressure-sensitive adhesives, and the fiber direction of the cloth sheet is in a state along the width direction A. The cross sheet of the adhesive layer 13 is easy to cut in the fiber direction.
The adhesive layer 13, the waterproof layer 14A, and the release paper 16 are adhered to each other on almost the entire surface.

The waterproof layer 14A is preferably made of a thermoplastic resin having excellent adhesive strength to the adhesive layer 13 in order to waterproof the joint portion of the zinc-plated steel plate 11, and further has strong resistance to alkali. To.

The waterproof layer 14A has a film thickness of 80 μm or more and 350 μm or less, preferably 100 μm or more and 200 μm or less, or 140 μm or more and 160 μm or less, a right-angled tear strength of 85 N / mm or less, and a tear. The elastic modulus is assumed to be 65 N / mm ² or less.
The cutting strength of the waterproof layer 14A at a right-angled tear strength is set to 85 N / mm or less, and the tear elastic modulus (tensile elastic modulus) is set to 65 N / mm ² or less.

At the same time, the waterproof layer 14A is made of a thermoplastic resin having a melting point of 60 ° C. or higher. Further, the waterproof resin sheet 14 has a load retention rate of 50% or more after 28 days in an alkali resistance test in which it is immersed in a 10% sodium hydroxide aqueous solution at 25 ° C. Here, the alkali resistance test conditions shall be in accordance with JIS A 1193.

Typical examples of the thermoplastic resin include polyethylene resins, but polyethylene, polyurethane, modified acrylics, polyvinyl chlorides, fluororesins and the like can also be used as long as they are resistant to alkali resistance. Specifically, it can be an EVA resin (ethylene / vinyl acetate copolymer resin), high density polyethylene (HDPE; High Density Polyethylene), or low density polyethylene (LDPE; Low Density Polyethylene).
The waterproof layer 14A is made of EVA resin having a VA content of 15% or more.

The adhesive layer 13 may be formed by being applied to the waterproof resin sheet 14 or may be in the form of an adhesive sheet attached to the waterproof layer 14A, and may have a cross sheet for setting the easy tearing direction of the waterproof resin sheet 14. can.

Specifically, a cloth sheet having an adhesive layer formed on one surface and a film serving as a waterproof layer 14A formed by applying an adhesive on one surface can be bonded to each other, or adhesive or adhesive can be applied to both sides of the cloth sheet. An adhesive layer 13 can be formed by forming an agent and laminating it with a film to be a waterproof layer 14A.

It should be noted that the cloth sheet may be in a state where the adhesive or the adhesive has penetrated, or the cloth sheet may be arranged inside the layer made of the pressure-sensitive adhesive. Further, the pressure-sensitive adhesives or adhesives used on both sides of the cloth sheet may have the same composition or different compositions, and the pressure-sensitive adhesives or adhesive layers on both sides of the cloth sheet may be formed at the same time. Alternatively, it can be formed in order.

As the adhesive layer 13, instead of the cloth sheet, a uniaxially stretched resin film or the like having easy cutting property in one direction can be adopted.

The pressure-sensitive adhesive or adhesive in the pressure-sensitive adhesive layer 13 has alkali resistance and has a temperature resistance performance such that the limit temperature at which the adhesive is lost is 60 or more, or the pot life is 23 ° C. for 30 minutes or more. The viscosity at 23 ° C. is preferably 5000 mPas or more.
The adhesive layer 13 is set so that the adhesive force between the adhesive layer 13 and the waterproof layer 14A is 5 N / 15 mm or more, and the adhesive force between the adhesive layer 13 and the steel plate 11 is 5 N / 15 mm or more. ..

The adhesive or pressure-sensitive adhesive of the pressure-sensitive adhesive layer 13 can be specifically an epoxy-based, urethane-based, acrylic-based, or rubber-based adhesive or pressure-sensitive adhesive.
The thickness of the adhesive layer 13 can be about 100 μm to 800 μm, more preferably about 200 μm to 500 μm.

In the sheet attaching step S4 described later, the waterproof resin sheet 14 in the present embodiment is pulled out from the roll by a required length, torn by hand in the width direction, and attached to a predetermined position. At this time, since the easy cutting direction is set in the width direction A by the cross sheet of the adhesive layer 13, it becomes easy for the worker to tear it by hand, and the workability can be improved. At the same time, since the step of applying the adhesive is not required, the number of work steps can be reduced and the workability in the deck plate manufacturing can be improved.

As shown in FIG. 5, the deck plate construction method in the present embodiment includes a steel plate arranging step S1, a pretreatment step S2, a sheet manual cutting step S3, a sheet pasting step S4, and a concrete placing step S5. , Shall have.

In the method of constructing the deck plate in the present embodiment, first, as the steel plate arranging step S1 shown in FIG. 5, as shown in FIG. 3, the end portions of the steel plate 11 to be the deck plate are overlapped to form the joint portion 12. Place in position.

Next, as the pretreatment step S2 shown in FIG. 5, the vicinity of the joint portion 12 on the surface of the steel sheet 11 is washed. Here, this cleaning is such that the adhesive layer 13 does not peel off in a subsequent process, and the oil film on the surface of the steel sheet is removed with alcohol or the like, or the surface of the steel sheet 11 is wiped to remove foreign substances such as sand and dust. Degree is enough.

Next, in the sheet manual cutting step S3 shown in FIG. 5, a roll-shaped waterproof resin sheet 14 is pulled out as a length corresponding to the area dimension to be sealed in the joint portion 12 on the surface of the steel plate 11, and then the width direction A is manually applied. The waterproof resin sheet 14 and the adhesive layer 13 are torn off so that a cutting line is formed on the surface. The waterproof resin sheet 14 of the present embodiment can be easily torn off even while wearing gloves such as work gloves worn at the work site.

In the sheet manual cutting step S3, the waterproof resin sheet 14 is cut into a plurality of sheets capable of having a plurality of overlapping regions, or the waterproof resin sheet 14 is cut not only in the width direction A but also in the vertical direction. It can be appropriately performed in the field corresponding to the region to be sealed in the joint portion 12 on the surface of the steel plate 11. Further, the waterproof resin sheet 14 to which a plurality of sheets can be attached may be cut and formed depending on the presence or absence of unevenness or the like on the joint portion 12 on the surface of the steel plate 11.
Further, in consideration of workability, the sticking step S4 and the hand cutting step S3 can be performed at the same time. In this case, the waterproof resin sheet 14 should be sealed while being stuck to the joint portion on the surface of the steel plate 11. It is also possible to tear off the area when it has been pasted.

Next, as the sheet attachment step S4 shown in FIG. 5, the waterproof resin sheet 14 cut to a predetermined size is attached to the joint portion 12, and as shown in FIG. 5, both sides overlapped as the joint portion 12. The steel plate 11 and the waterproof resin sheet 14 located on the respective surfaces are brought into close contact with each other. After the waterproof resin sheet 14 is attached to the joint portion 12, time may elapse as a curing step.

Finally, as the concrete placing step S5 shown in FIG. 5, concrete 15 having a predetermined thickness is placed on the steel plate 11, and as shown in FIG. 2, the steel plate 11, the adhesive layer 13 and the prevention layer 14A are separated from each other. A joint portion 12 on which the waterproof resin sheets 14 are laminated is formed to form a deck plate 10.

In the method of constructing the deck plate of the present embodiment, the waterproof resin sheet 14 attached to the joint portion 12 of the zinc-plated steel plate 11 is made of a thermoplastic resin having the above-mentioned characteristics and is made of a thermoplastic resin in the width direction before the concrete is placed. Since A has easy cutting property, in the sheet manual cutting step S3, the waterproof resin sheet 14 is torn by hand without using a cutting jig to adjust the length, and the sheet attaching step S4 has a desired size. Since it is possible to perform the pasting in, the handleability and workability in these processes can be improved.

At the same time, the waterproof resin sheet 14 is made of a thermoplastic resin having the above-mentioned characteristics and has easy cutting property in the width direction A, so that even if there are irregularities such as burrs in the joint portion 12 to be attached and its vicinity, the waterproof resin is used. Even if an external force such as a worker contacting the sheet 14 acts, the waterproof resin sheet 14 is set so that the waterproof resin sheet 14 has easy cutting property and flexibility with the sheet thickness of the waterproof resin sheet 14 within the above range. Therefore, the adhesiveness is maintained, and at the same time, even when concrete is placed on the waterproof resin sheet 14, the waterproof resin sheet 14 is prevented from peeling off from the joint portion 12 and the alkaline liquid is prevented from seeping in. can. This makes it possible to ensure waterproofness when the deck plate is constructed and to maintain waterproofness against subsequent changes over time.

In the method of constructing the deck plate of the present embodiment, even if the steel plate 11 has irregularities, it is possible to prevent the occurrence of twisting when the waterproof resin sheet 14 is attached, and it is between the steel plate 11 and the steel plate 11. It is possible to carry out the pasting work without any gaps.

Since the melting point of the thermoplastic resin used for the waterproof resin sheet 14 of the present embodiment is 60 ° C. or higher, when the deck plate 10 is constructed, the joint portion 12 of the zinc-plated steel plate 11 which is the construction portion is exposed to sunlight or the like. Even when the temperature rises due to the above, it is possible to prevent the waterproof resin sheet 14 from peeling off at the joint portion 12 and the waterproof resin sheet 14 from being damaged, whereby the deck plate 10 can be prevented even at a construction site in a high temperature state. It is possible to ensure the waterproofness of the plastic during construction and to maintain the waterproofness against subsequent changes over time.

Since the waterproof resin sheet 14 and the adhesive layer 13 of the present embodiment have the above-mentioned alkali resistance, they are exposed to the alkali caused by the concrete at the time of concrete placement and after the concrete is placed in the construction of the deck plate 10. Even if this is done, it is possible to maintain the waterproofness of the waterproof resin sheet 14 and the adhesive layer 13 to ensure the waterproofness when the deck plate is constructed, and to maintain the waterproofness against subsequent changes over time.

The construction method of the deck plate of the present embodiment is only the steps of the steel plate arranging step S1, the pretreatment step S2, the sheet hand cutting step S3, the sheet pasting step S4, and the concrete placing step S5. It becomes possible to construct a plate. As a result, the number of work steps can be reduced and the work time can be shortened. In this construction method, a high sealing effect is exhibited in terms of materials by simply attaching the preventive resin sheet 14 made of thermoplastic resin to the joint portion 12 by the adhesive layer 13 made of adhesive or adhesive material. It is possible to provide cheaper construction than the conventional construction method.

Hereinafter, a second embodiment of the method for constructing the waterproof sheet, the deck plate, and the deck plate according to the present invention will be described with reference to the drawings.
FIG. 6 is a schematic cross-sectional view showing a joint portion of the deck plate in the present embodiment.
The present embodiment differs from the first embodiment described above in that it relates to a joint portion, and the other corresponding components are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, as shown in FIG. 6, the joint portion 12A is formed in the recess of the corrugated sheet steel plate 11.

The waterproof resin sheet 14 in the present embodiment is made of the same resin as the thermoplastic resin in the first embodiment, but the waterproof layer 14A has a thickness of about 150 μm to 200 μm. This is to improve the adhesion to the steel plate 11 in the recesses of the steel plate 11 and to improve the handleability of the waterproof resin sheet 14. As a result, in the joint portion 12A, it is possible to prevent the waterproof resin sheet 14 from having a portion floating from the surface of the steel plate 11 or a portion having poor adhesion, and the waterproof resin sheet 14 has no gap with the steel plate 11. Can be attached.

In the present embodiment, the same effect as that of the first embodiment can be obtained, the handling property of the waterproof resin sheet 14 is further improved, and the waterproof resin sheet 14 and the adhesive are also adhered to the connecting portion 12A of the concave portion of the steel plate 11. It is possible to maintain the waterproofness of the layer 13 to ensure the waterproofness when the deck plate is constructed, and to maintain the waterproofness against the subsequent change with time.

Further, by providing the connecting portion 12A in the recess of the steel plate 11, it is possible to reduce the occurrence of damage to the waterproof resin sheet 14.
By providing the connecting portion on the inclined side surface of the corrugated steel plate 11, it is possible to further reduce the occurrence of damage to the waterproof resin sheet 14.

Hereinafter, a third embodiment of the method for constructing the waterproof sheet, the deck plate, and the deck plate according to the present invention will be described with reference to the drawings.
FIG. 7 is a schematic cross-sectional view showing a joint portion of the deck plate in the present embodiment.
In the present embodiment, the difference from the first and second embodiments described above is in the shape of the steel sheet, and the corresponding components other than the above are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, as shown in FIG. 7, the steel plate 11B has a flat plate shape, and the ends thereof are abutted against each other at the joint portion 12B so that the surfaces are flush with each other. It should be noted that the flat plate shape is formed only in the vicinity of the joint portion 12B, and the shape of the steel plate 11B in the other range may be the corrugated plate shape described above or another shape.

The waterproof resin sheet 14 in the present embodiment is made of the same resin as the thermoplastic resin in the first and second embodiments, but the waterproof layer 14A has a thickness of about 200 μm to 250 μm (in the case of flat plate butt). This maintains the adhesion of the waterproof resin sheet 14 even when the tensile force between the steel plates 11B acts on the joined portion 12B in the butted state of the steel plates 11B, and prevents the steel plates 11B from peeling off. Because. As a result, in the joint portion 12B, it is possible to prevent a portion where the waterproof resin sheet 14 is peeled off from the surface of the steel plate 11B or a portion where the adhesive is poor, and the waterproof resin sheet 14 has no gap with the steel plate 11B. Can be attached.

Hereinafter, a fourth embodiment of the method for constructing the waterproof sheet, the deck plate, and the deck plate according to the present invention will be described with reference to the drawings.
FIG. 8 is a perspective view showing before the sheet attaching process at the joint portion of the deck plate in the present embodiment.
In this embodiment, the difference from the first to third embodiments described above is in the shape of the joint portion, and the corresponding components other than the above are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, as shown in FIG. 8, there is a gap 11E in the steel plate 11 itself around the pillar 11D and the like before the concrete is placed. The shape of the steel plate 11B in a range other than the vicinity of the pillar 11D may be the corrugated plate shape described above or another shape.

The waterproof resin sheet 14 in the present embodiment is made of the same resin as the thermoplastic resin in the first embodiment, but the waterproof layer 14A has a thickness of about 200 μm to 250 μm (in the case of closing the gap) as in the third embodiment. It is said that.

In the method of constructing the deck plate of the present embodiment, the steel plate piece 11C is placed in the gap 11E, and the steel plate 11 and the steel plate piece 11C and the gap 11E are included in the joint portion 12B.
It should be noted that the method of arranging and attaching the waterproof resin sheet 14 in the figure is an example, and can be appropriately set by judgment at the site.

Further, a plurality of waterproof resin sheets 14 of the present embodiment are stacked and attached to the steel plate 11 and the steel plate piece 11C so as to close the gap 11E, and further to the periphery of the pillar 11D so as to be in close contact with the circumference of the pillar 11D. As described above, the concrete 15 can be cast from above including the steel plate 11, the steel plate piece 11C, and the gap 11E to form the deck plate 10.

Hereinafter, examples of the present invention will be described.

<Experimental Example 1; Alkali resistance test>
Since the thermoplastic resin sheet used as the waterproof layer comes into direct contact with concrete and is affected by the generated calcium hydroxide aqueous solution, alkali resistance is required as a single sheet.

As an alkali resistance test, various thermoplastic resin sheets used as a waterproof layer were immersed in a 10% sodium hydroxide aqueous solution for 28 days in accordance with JIS A 1193 standards. However, the test temperature was set to 25 ° C. For the evaluation before and after immersion, the tensile strength was measured according to JIS K7127, and the strength retention rate was calculated. In addition, the effect on the appearance of the immersion in the alkaline solution was observed.

As the thermoplastic resin sheet used as the waterproof layer, four types of HDPE, LDPE, EVA, and PC were compared, and the thickness of each sheet was 300 μm.

・ Tensile strength test conditions Dumbbell shape: JIS K7127 Type 5
Tensile speed: 200 mm / min

・ Tensile strength (MPa)
Tensile strength = (maximum strength (N)) / (test sample thickness (mm) x test sample width (mm) test sample thickness (mm) x test sample width (mm))

・ Strength retention rate (%)
Strength retention rate = Tensile strength of non-immersed sample / Tensile strength of immersed sample × 100
The results of the alkalinity test are shown in Table 1.

From this result, in the thermoplastic resin used as the waterproof layer, the PC had a weak alkali resistance, and cracks were generated after immersion. The breaking strength is also reduced, and it is not suitable as a sealing sheet for preventing leakage of an alkaline aqueous solution. The sheet is easily broken, and cracks occur, causing leakage. As for the alkali resistance, it is desirable that the strength retention rate is 50% or more, and it is most suitable to use a resin having an alkali resistance of 70% or more.

<Experimental example 2; tear strength test>
Construction of deck plates and synthetic slab structures is often performed in places where scaffolding is unstable and workability is poor, such as in high places. The waterproof resin sheet (waterproof tape) used as a seal is also required to be hand-cut in order to enable simple construction.
In the configuration of the waterproof tape of the present invention, a cross-sheet base material or a uniaxially stretched film base material is laminated on the adhesive layer to make the tape easy to cut by hand, but the hand-cutting property deteriorates due to the influence of the waterproof layer.

For HDPE, LDPE, and EVA, which have good alkali resistance in Experimental Example 1, tear strength was verified in order to examine a thermoplastic resin that can be used as a waterproof tape that can be cut by hand. The thickness of each thermoplastic resin sheet is 300 μm, and the thermoplastic resin is made of PE cloth double-sided tape No. 2 manufactured by Teraoka Seisakusho. The one to which 710 was bonded was compared as a waterproof tape.

-Tear strength test conditions (JIS K7128-3)
Dumbbell shape: Right-angled tear test piece Tensile speed: 200 mm / min

・ Tear strength (N / mm)
Tear strength = maximum tear load (N) / test piece thickness (mm)

-Tear elastic modulus (N / mm ² )
Elastic modulus at stress 0N-10N in tear test

-Evaluation of hand-cutting property A sensory evaluation of the state in which the waterproof tape (with release paper) is torn by hand.
Table 2 shows the types of resins that were compared and the results of the tear strength test.
As a sensory evaluation in the table
Easy to tear: Double circle tear: Single circle Not torn: Shown as cross.

From this result, it is recognized that the waterproof tape has a tear strength of 140 N / mm or less, and preferably 70 N / mm or less, which is excellent in simple workability. Will be. With the waterproof layer alone, when the tear strength is 85 N / mm or less, preferably 60 N / mm or less, and the tear elastic modulus is 65 N / mm ² or less, preferably 35 N / mm ² or less, simple hand-cutting property can be obtained. ..

Further, EVA is most desirable as the resin of the waterproof layer, and when the VA content is 15 wt% or more, preferably 25 wt% or more, good hand-cutting property can be obtained.

<Experimental example 3; Adhesive strength test>
When the deck plate and synthetic slab structure were actually constructed as a sealing tape, the required adhesive strength was confirmed. Since galvanized steel sheets are generally used for decks, the adhesive strength to the galvanized steel sheets and the interfacial adhesion between the waterproof layer and the adhesive layer constituting the waterproof tape were evaluated using various adhesive layers.
As the waterproof layer, the EVA resin (VA28%, MFR7) used in Experimental Example 2 was used, and a waterproof layer having a thickness of 300 μm was used. For the adhesive layer, a double-sided tape having acrylic, butyl rubber, and silicone adhesives shown in Table 3 is used, and the adhesive strength of the waterproof layer / adhesive layer (adhesive) interface when bonded to the waterproof layer. The adhesive strength at the adhesive layer (adhesive) / zinc-plated steel plate interface when the waterproof tape to which the double-sided tape was bonded was bonded to the zinc-plated steel plate was measured.

Measurement method ・ Waterproof layer / adhesive layer interface:
A measurement sample (waterproof tape) is cut out to a width of 15 mm x 150 mm, and the adhesive force at the interface is measured with a tensile tester at a speed of 200 mm / min and 180 ° peeling.
・ Adhesive layer / galvanized steel sheet interface:
A measurement sample (waterproof tape) is cut out to a width of 15 mm x 150 mm and bonded to a galvanized steel sheet, and then the adhesive force at the bonded interface is measured with a tensile tester at a speed of 200 mm / min and 180 ° peeling.

* As a judgment of adhesive strength, sensory evaluation in actual use was carried out.
A galvanized steel sheet was bent to create a 7 mm step, a waterproof sheet was attached to the step, and the interface state was observed.
Table 3 shows the types of double-sided tape used as the adhesive layer and the measurement results of the adhesive strength.
In the table, the sensory evaluation is shown as follows.
Good (no floating, peeling): No problem in using double circle (no floating, peeling): Single circle Poor adhesive strength in actual use (floating, peeling occurs): X

From this result, as for the interfacial adhesive strength of the waterproof layer / adhesive, the silicone-based 3.7N / 15mm easily peels off, and when it is actually used and bonded to the uneven part of the deck, it is at the interface. Floating will occur. When floating occurs, the alkaline solution permeates, and if an adhesive that does not have alkali resistance is used, the waterproof function cannot be maintained.
Therefore, it is desirable that the adhesive strength of the waterproof layer / adhesive interface is 5N / 15 mm or more, and more specifically, 10N / 15 mm or more.

It was confirmed that any adhesive layer can be used without any problem as the adhesive strength of the adhesive / galvanized steel sheet.
Therefore, it is desirable that the adhesive strength of the pressure-sensitive adhesive / galvanized steel sheet is 5N / 15mm or more, and more specifically, 10N / 15mm or more.

<Experimental example 4; tear strength test>
As a waterproof tape, we verified the thickness of the waterproof layer in order to further improve the hand-cutting property.
If the waterproof layer becomes thinner, the hand-cutting property will improve, but the strength when applied as a sealing tape may decrease, and the effect of thickness on the waterproof functionality required for the waterproof tape was confirmed. ..

As the waterproof layer used for the verification, a film having a thickness of 500 μm, 400 μm, 300 μm, 250 μm, 200 μm, 150 μm, and 100 μm was used using the EVA resin (VA28%, MFR7) used in Experimental Example 2. ..
PE cloth double-sided tape No. made by Teraoka Seisakusho on the waterproof layer. The 710 was pasted together, and a tear strength measurement as a waterproof tape, a trampling test as a tape strength measurement, and an evaluation of waterproofness were carried out.

-Tear strength test conditions (JIS K7128-3)
Dumbbell shape: Right-angled tear test piece Tensile speed: 200 mm / min

-Tear strength (N) = Maximum tear load (N) in the tear strength test
The evaluation of the hand-cutting property is based on Experimental Example 2 including the release paper.

-Treading test Attach each waterproof tape with a different thickness of the waterproof layer to the corner of the deck plate (JIS G3352) in a dogleg shape, and on the pasted waterproof tape, change the appearance after stepping 50 times. Observed.
As the shoes for stepping on, safety shoes manufactured by Midori Anzen (HG ISA-805) were used.
As an evaluation in the table
No problem in use: Single circle The appearance is severely damaged, but it can be used: There are triangular holes and tears, and there is a problem in use: Shown as a cross.

-Evaluation of waterproofness Create a container with a slit of 2 mm in width x 15 cm in length in the center of a 20 cm square aluminum pan, attach waterproof tape to the slit, seal it, and then fill the inside of the container with water.
Leave it in this state for 2 hours, and check if water leaks from the slit portion.
Table 4 shows the results of tear strength, trampling test, and waterproofness evaluation of each waterproof tape with different thicknesses of the waterproof layer.

From this result, if the thickness of the waterproof layer becomes thin, the tear strength decreases and the hand-cutting property improves.
Even if the thickness of the waterproof layer is reduced to 100 μm, it can be used without any problem in terms of waterproof performance. Is preferably 100 μm or more.

As a result of the above verification, it was found that when the waterproof layer is 400 μm thick, the tearability is poor and it is difficult to cut a large number of sheets without using a cutting jig.

From the above, it can be seen that the thickness of the waterproof layer is preferably 100 μm or more and 350 μm or less.

10 ... Deck plates 11, 11A, 11B ... Galvanized steel plate (steel plate)
11C ... Steel plate piece 11D ... Gap 11E ... Pillar 12, 12A ... Joint part 13 ... Adhesive layer 14 ... Waterproof resin sheet 14A ... Waterproof layer 15 ... Concrete 16 ... Release paper

Claims (10)

A thermoplastic resin sheet that is attached to waterproof the joints of steel plates on which concrete is placed.
Formed to easily tear in one direction in the seat surface,
In an alkali resistance test in which it is immersed in a 10% sodium hydroxide aqueous solution at 25 ° C., it has a waterproof layer having a load retention rate of 50% or more and a thickness of 350 μm or less after 28 days.
A waterproof resin sheet comprising a cross sheet or a uniaxially stretched film. A thermoplastic resin sheet that is attached to waterproof the joints of steel plates on which concrete is placed.
Formed to easily tear in one direction in the seat surface,
In an alkali resistance test in which it is immersed in a 10% sodium hydroxide aqueous solution at 25 ° C., it has a waterproof layer having a load retention rate of 50% or more and a thickness of 350 μm or less after 28 days.
A waterproof resin sheet characterized in that the waterproof layer is made of EVA resin having a VA content of 15% or more. The waterproof resin sheet according to claim 1 or 2, wherein the waterproof resin sheet has a cutting strength of 140 N / mm or less at a right-angled tear strength. The waterproof resin sheet according to any one of claims 1 to 3 , wherein the waterproof layer and the adhesive layer are laminated. The waterproof resin sheet according to any one of claims 1 to 4, wherein the waterproof layer has a cutting strength of 85 N / mm or less at a right-angled tear strength and a tear elastic modulus of 65 N / mm. ² A waterproof resin sheet characterized by the following. The waterproof resin sheet according to claim 4 or 5, wherein the adhesive force between the waterproof layer and the adhesive layer is 5 N / 15 mm or more. The waterproof resin sheet according to any one of claims 4 to 6, wherein the adhesive force between the steel plate and the adhesive layer is 5 N / 15 mm or more. The waterproof resin sheet according to any one of claims 1 to 7, wherein the waterproof resin sheet is formed in a tape shape having the width direction as the tear-prone direction. A step of attaching the waterproof resin sheet according to any one of claims 1 to 8 to a joint portion of a steel plate to seal the joint portion of the steel plate.
A method for constructing a deck plate, which comprises a step of pouring concrete onto the steel plate. By adhering the waterproof resin sheet according to any one of claims 1 to 8 to the joint portion of the steel plate, the adhesive layer and the thermoplastic resin are sequentially laminated on the joint portion of the steel plate to form a seal. A deck plate characterized by pouring concrete onto the steel plate in this state.

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