JP2012237098A - Repair waterproof structure of roof floor having parapet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair waterproof structure of a roof floor, which is favorably applied to a parapet having no jaw part, without complicated construction at an internal corner.SOLUTION: A repair waterproof structure of a roof floor having a parapet 1 includes a deformable sheet 6 which continuously covers an existing waterproof layer 4 over the area extending from the upper end face and the inner side surface of the parapet 1 to the planar roof floor part 3 in the vicinity of the parapet, and overlapping waterproof layer 7 on the sheet 6. The deformable sheet 6 is formed of a foam resin sheet. The foam sheet includes a foam layer of a polyolefin resin foam having inherent bubbles with an average aspect ratio (Dz (maximum diameter in parallel to sheet thickness direction))/(Dxy (maximum diameter in parallel to sheet width or length direction)) of 1.1 to 4.0, an expansion ratio of 5 to 30, and a compression strength of 2 kgf/cmor higher, and a reinforcement layer disposed on one side thereof.

Description

  The present invention relates to a parapet provided in a standing manner on a peripheral edge of a building rooftop, a balcony, or the like, and more particularly to a rooftop renovation waterproof structure having a parapet. In this specification, for the inner and outer directions, the center direction on the roof, that is, the right direction in FIG. 1 is the inner direction, and the opposite direction is the outer direction.

  FIG. 3 shows a conventional general repair waterproof structure on a rooftop having a parapet. In the figure, a waterproof layer (14) is provided from the inner surface of the rising wall (12) of the parapet (11) to the upper surface of the rooftop flat surface portion (13). Of the existing waterproof layer (14), The portion extending from the inner portion of the rising wall (12) to the portion near the rising wall of the rooftop flat surface portion (13) is removed, and the removal space is filled with mortar or the like to form the backfill portion (15). A new waterproof layer (18) made of a urethane coating is passed from the upper end surface of (12) through the backfill portion (15) to the remaining portion of the existing waterproof layer (14) via the mesh (16) (17). It is provided in an overlaid form. (19) is a cap, and (20) is a ventilation cushioning sheet.

  However, such a modified waterproof structure has the following problems.

1) The removal of the existing waterproof layer requires a considerable work period and cost, which is further increased when a protective layer is provided.

2) Noise and dust generation is unavoidable in the waterproof layer removal work, and this is a problem that cannot be overlooked especially in the case of residential buildings.

3) The disposal of waste materials that accompany removal of the waterproof layer requires considerable costs under the recent strict regulations.

4) There is a risk of water leakage during the work to remove the waterproof layer and after that, if sufficient measures against rainfall are not taken.

5) The height of the parapet is about 40cm, and the part below the chin is quite low, so the waterproof layer removal work has to be a complicated work with an unnatural posture, and the work can be done completely. There are no cases.

  In order to solve such problems, the modified waterproof structures of Patent Documents 1 and 2 have been proposed.

  As shown in FIG. 4, in the former modified waterproof structure, the board plate (54) is fixed between the jaw part (52) of the parapet (51) and the protective concrete layer (57) on the rooftop flat part (53). And an overlying waterproof layer (56) is coated from the upper end surface of the parapet (51) to the upper surface of the protective concrete layer (57) through the inner surface of the board plate (54). (55) is an existing waterproof layer, (58) is a primer, and (59) is a clamp.

  As shown in FIG. 5, the modified waterproof structure of the latter is a sheet body (74) that can deform from the jaw part (72) of the parapet (71) to the protective concrete layer (76) on the rooftop flat part (73). The covering waterproof layer (75) is covered from the upper end surface of the parapet (71) through the inner surface of the sheet body (74) to the upper surface of the protective concrete layer (76). (77) is a heat insulation layer, (78) is an existing waterproof layer, and (79) is an insertion support member.

Japanese Patent No. 3523176 Japanese Patent No. 4642425

  However, the modified waterproof structures described in Patent Documents 1 and 2 are intended for parapets having a chin part, and parapets having no chin part are not considered.

  Moreover, it is avoided that a discontinuous part arises between the board board (54) in the repair waterproof structure of patent document 1, or the deformable sheet | seat body (74) in the repair waterproof structure of patent document 2, and a roof top plane part. Therefore, it is necessary to attach a member for connecting this portion to the corner, which makes the construction complicated. When forming a urethane coating film, it is necessary to lay a sheet of non-woven fabric or the like on the board plate (54) or the sheet body (74), and the construction becomes more complicated.

  In view of the above-described problems of the prior art, the present invention provides a rooftop renovation waterproof structure that can be suitably applied to a parapet that does not have a chin portion and can avoid complicated construction in a corner. The purpose is to do.

  The present invention has been devised to achieve the above object, and as shown in FIG. 1, is a rooftop renovation waterproof structure having a parapet (1), and includes an upper end surface and an inner surface of the parapet (1). The existing waterproof layer (4) was continuously covered with a deformable sheet (6) from the vicinity of the parepet in the rooftop flat surface part (3), and an overlying waterproof layer (7) was provided on the sheet. It is a rooftop renovation waterproof structure with a pallet that features.

The deformable sheet (6) is made of a resin foam sheet, and the foam sheet is an aspect ratio Dz (maximum diameter parallel to the sheet thickness direction) / Dxy (parallel to the sheet width or length direction) of the internal bubbles. A foam layer composed of a polyolefin resin foam having an average value of (maximum diameter) of 1.1 to 4.0, a foaming ratio of 5 to 30 times, and a compressive strength of 2 kgf / cm ² or more; It consists of a provided reinforcing layer.

  The foam sheet is formed by laminating a reinforcing sheet having a strength capable of suppressing the foaming force in the in-plane direction of the original fabric during foaming on both sides of the original fabric for the foam layer. By suppressing the foaming in the two-dimensional direction, foaming was performed only in the thickness direction, and the obtained foamed laminate was obtained by cutting in the in-plane direction with a foamed layer.

  The rooftop repair waterproof structure of the present invention can be suitably applied to a parapet that does not have a jaw portion.

  Further, since the existing waterproof layer (4) is continuously covered with the deformable sheet (6) from the upper end surface and the inner side surface of the parapet (1) to the vicinity of the parepet in the flat roof portion (3), A discontinuous part does not occur in the corner, so that complicated construction in the entrance corner can be avoided.

  Furthermore, since it is not necessary to remove the existing waterproof layer, it is possible to eliminate the generation of noise, dust, waste materials, etc. associated with the removal, and to improve the construction site and the surrounding environment.

1 is a vertical cross-sectional view of a rooftop renovation waterproofing structure having parapets according to the present invention. 2A is a schematic perspective view of a spindle-shaped bubble, and FIG. 2B is an enlarged schematic view of a part of a cross section parallel to the z direction in FIG. 1A. It is a vertical sectional view of a roof waterproofing structure having a parapet showing the prior art. FIG. 3 is a vertical sectional view of a roof waterproofing structure having a parapet according to Patent Document 1; It is the vertical sectional view of the repair waterproof structure of the roof which has a parapet according to patent documents 2.

  In the rooftop renovation waterproof structure according to the present invention, the existing waterproof layer (4) is made of asphalt waterproof, for example.

  An existing waterproof layer (4) is provided from the inner side surface of the parapet (1) to the entire rooftop flat portion (3), and a ventilation cushioning sheet (5) is laid on the rooftop flat surface portion (4a) of the existing waterproof layer (4). Has been.

The ventilation cushion sheet (5) is composed of, for example, a nonwoven fabric sheet or a modified asphalt sheet.

  The overlaid waterproof layer (7) is formed by a waterproof sheet made of a synthetic resin, or a waterproof coating film made of urethane, FRP, or the like. A particularly preferred overlying waterproof layer (7) is a waterproof layer formed by applying urethane coating over the entire top of the deformable sheet (6) to the entire top of the ventilation cushioning sheet (5). A vinyl chloride sheet can also be used as the overlying waterproof layer (7).

  The deformable sheet (6) extends over the existing waterproof layer (4) and the ventilation cushioning sheet (5) from the upper end surface and the inner side surface of the parapet (1) to the portion near the parapet in the rooftop flat surface portion (3). It is fixed using an appropriate fixing member.

The deformable sheet (6) is made of a resin foam sheet, and the foam sheet has an aspect ratio Dz (maximum diameter parallel to the sheet thickness direction) / Dxy (in the sheet width or length direction) of the internal bubbles. A foamed layer made of a polyolefin resin foam having an average value of parallel maximum diameters of 1.1 to 4.0, a foaming ratio of 5 to 30 times, and a compressive strength of 2 kgf / cm ² or more; What consists of a reinforcement layer provided in the single side | surface is preferable.

  A foam sheet composed of a foam layer made of a polyolefin resin foam and a reinforcing layer provided on one side of the foam layer is, for example, on both sides of the original fabric for the foam layer, in the in-plane direction of the original fabric being foamed. A reinforcing sheet having a strength capable of suppressing foaming force is laminated, and the raw material of this laminate is foamed only in the thickness direction by suppressing foaming in the two-dimensional direction in the plane, and the obtained foam laminate is obtained. It is obtained by cutting in the in-plane direction (arrow xy direction in FIG. 2A) with the foam layer. The foamed laminate may be a commercial product such as “Zetron” manufactured by Sekisui Chemical Co., Ltd. In the deformable sheet (6) made of such a foam sheet, the reinforcing layer may be placed either above or below the foamed layer after construction.

  Next, a rooftop repair waterproofing method having a parapet according to the present invention will be described.

  First, a deformable sheet (6) is formed on the existing waterproof layer (4) and the ventilation cushioning sheet (5) from the upper end surface and the inner side surface of the parapet (1) to the portion near the parapet in the rooftop flat surface portion (3). Cover. The inner end of the deformable sheet (6) is superimposed on the outer edge of the ventilation cushioning sheet (5).

  Next, an overlying waterproof layer (7) is provided so as to overlap from the deformable sheet (6) to the ventilation cushioning sheet (5).

  Finally, cover the upper end portion of the parapet (1) with a cap (8).

  Next, the foam sheet constituting the deformable sheet (6) will be described.

  First, the ratio Dz / Dxy (that is, the aspect ratio) between the diameter Dz in the sheet thickness direction and the diameter Dxy in the in-plane direction in the bubbles present in the foam sheet will be described.

  As shown in FIG. 2, an enlarged photograph (c) 10 to 20 times the arbitrary cross section (b) parallel to the sheet thickness direction (referred to as z direction) of the foam sheet (a) is taken. ) The following two constant direction maximum diameters (Dz, Dxy) in at least 50 bubbles randomly selected from the above are measured, and the number average value is calculated.

Dz: Maximum diameter parallel to z direction of bubbles in foam sheet Dxy: Maximum diameter of bubbles in foam sheet parallel to sheet width or length direction (referred to as xy direction) Average value of Dz / Dxy is 1 If it is larger, it becomes a foam having high compressive strength. This is because the spindle-shaped bubbles receive a force in the major axis direction (that is, the z direction).

  Here, the “in-plane direction” means any direction (also referred to as an xy direction) in the sheet surface of the foam sheet, and includes a length direction and a width direction.

When the compressive strength of the foam sheet is less than 2 kgf / cm ^{2, the} foam sheet dents when it is stepped on or after construction, causing water accumulation.

  When the expansion ratio exceeds 30 times, the wall of each foam cell becomes thin and sufficient compression strength cannot be obtained.

  If the expansion ratio is less than 5 times, the cost increases and it is not practical.

If the average value of the aspect ratios Dz / Dxy of the internal bubbles is less than 1.1, the compressive strength is lowered, so that physical properties such as an expansion ratio of 5 to 30 times and a compressive strength of 2 kgf / cm ² or more cannot be achieved. When the average value of the aspect ratio is 1.1 or more, the spindle-shaped bubbles receive a compressive force in the sheet thickness direction, so that a force is applied in the major axis direction of the bubbles, so that a high compressive strength is exhibited in that direction. . Therefore, the average aspect ratio is 1.1 or more, preferably 1.3 or more.

  The foams constituting the waterproof structure according to the present invention include those obtained by chemical foaming and those obtained by physical foaming.

  In the former, a thermally decomposable chemical foaming agent that generates a decomposition gas by heating is dispersed in the polyolefin resin composition in advance, and the obtained foamable composition is once shaped into a sheet-like foaming raw material, It can be produced by heating and foaming with a gas generated from a foaming agent. Representative examples of the pyrolytic chemical foaming agent include azodicarbonamide, benzenesulfonyl hydrazide, dinitrosopentamethylenetetramine, toluenesulfonyl hydrazide, 4,4-oxybis (benzenesulfonyl hydrazide) and the like. The amount of the foaming agent added is preferably 2 to 20 parts by weight with respect to 100 parts by weight of the resin composition.

  The latter can be manufactured by once dissolving a physical foaming agent in a polyolefin-based resin composition under high pressure, and then placing the resulting foamable composition under normal pressure to generate gas and foam. Examples of physical blowing agents include water, carbon dioxide, nitrogen, organic solvents, and the like.

  The production method for obtaining the foam sheet is not particularly limited. Preferably, a polyolefin resin and a modifying monomer are melt-blended to obtain a modified polyolefin, and 100 parts by weight of the modified polyolefin is subjected to thermal decomposition of azodicarbonamide or the like. 2 to 20 parts by weight of the mold chemical foaming agent is dispersed, and the obtained foamable resin composition is once shaped into a sheet-like raw material, and then the obtained foamable sheet is decomposed into the pyrolytic chemical foaming agent. This is a method of heating to a temperature higher than that for chemical foaming.

  By adopting the resin modification method as described above, it is possible to foam the foamed sheet at normal pressure despite the low degree of crosslinking of the molded foam sheet.

  Here, the low degree of crosslinking means a range of 25% or less in gel fraction.

  In general, the measurement of the gel fraction is expressed as a weight ratio between the initial weight of the sample and the sample dissolved in 120 ° C. hot xylene for 24 hours and dried from the gel.

  The foamable sheet obtained using the modified resin as described above has a lower gel fraction than that of a sheet cross-linked with an electron beam or a sheet cross-linked with a pyrolytic chemical cross-linking agent, and is heated and foamed at normal pressure. Therefore, the cell of a foam becomes large compared with them. Therefore, the obtained foam has a thick cell wall and is strong in mechanical properties such as spotting, and is suitable for a tatami flooring.

  The polyolefin constituting the main component of the polyolefin resin in the present invention is a homopolymer of an olefin monomer or a copolymer of a main component olefin monomer and another monomer, and is not particularly limited. Polyethylene such as low density polyethylene, high density polyethylene, linear low density polyethylene, homotype polypropylene, random type polypropylene, block type polypropylene, polybutene, ethylene-propylene copolymer, ethylene-propylene-diene ternary copolymer Examples thereof include copolymers mainly composed of ethylene such as polymers, ethylene-butene copolymers, ethylene-vinyl acetate copolymers, ethylene- (meth) acrylate copolymers, and two or more of these. A combination of these may be used.

  As the polyolefin constituting the main component of the polyolefin resin, one or a combination of two or more of the above-described polyethylene and polypropylene is preferable.

  The polyolefin resin refers to a resin composition in which the ratio of the polyolefin is 70 to 100% by weight. Resins other than the polyolefin constituting the polyolefin resin are not limited, and examples thereof include polystyrene and styrene elastomer. If the proportion of polyolefin in the polyolefin resin is less than 70% by weight, not only the characteristics of polyolefin, such as light weight, chemical resistance, flexibility and elasticity, but also it is difficult to secure the melt viscosity necessary for foaming. This is not preferable.

  The modifying monomer is a compound having two or more functional groups capable of radical reaction in the molecule. Examples of the functional group include an oxime group, a maleimide group, a vinyl group, an allyl group, and a (meth) acryl group. The modifying monomer is preferably a dioxime compound, a bismaleimide compound, divinylbenzene, an allyl polyfunctional monomer, or a (meth) acrylic polyfunctional monomer. The modifying monomer may be a cyclic compound having two or more ketone groups in the molecule, such as a quinone compound.

  As a method for shaping the sheet-like foamable raw material, methods generally performed in plastic molding processes such as press molding, blow molding, calendering molding, injection molding, etc. can be applied in addition to extrusion molding. A method of immediately forming a foamable resin composition discharged from a screw extruder is preferable from the viewpoint of productivity. In this method, a continuous original fabric sheet having a constant width can be obtained.

  The foaming of the sheet-shaped raw material is usually performed in a temperature range not lower than the decomposition temperature of the pyrolytic chemical foaming agent and not higher than the thermal decomposition temperature of the thermoplastic resin. In particular, as a continuous foaming apparatus, in addition to a take-off type foaming machine that foams while taking out a foam on the outlet side of a heating furnace, a belt type foaming machine, a vertical or horizontal type foaming furnace, a hot air thermostat, or a hot bath Foaming oil baths, metal baths, salt baths, etc. are used.

  In order to obtain a foam sheet composed of the above-mentioned spindle-shaped bubbles, reinforcing sheets having a strength capable of suppressing the foaming force in the in-plane direction of the original fabric during foaming are laminated on both sides of the original fabric before foaming. This is because by suppressing the foaming in the two-dimensional direction in the plane at the time of foaming, it becomes possible to foam the original fabric only in the thickness direction. This is because it becomes a spindle shape oriented in the thickness direction.

  The reinforcing sheet applicable to this method may be any material that can withstand an environment in which the foaming temperature of the original fabric, that is, the melting point temperature of the polyolefin resin or higher and the decomposition temperature of the pyrolytic foaming agent is exceeded. The material can be appropriately selected from, for example, paper, cloth, wood, iron, non-ferrous metal, non-woven fabric, cold koji, glass fiber, and inorganic fiber.

  A foam sheet constituting the deformable sheet (6) is obtained by cutting the foamed laminate thus obtained in the in-plane direction with the foam layer.

  The present invention will be described more specifically with reference to examples.

Example 1
Foam on top of the existing waterproofing layer (4) made of asphalt and the ventilation cushioning sheet (5) made of modified asphalt from the upper end surface and inner side surface of the parapet (1) to the portion near the parapet in the flat roof portion (3) A deformable sheet (6) comprising a sheet is coated. The inner end of the deformable sheet (6) is superimposed on the outer edge of the ventilation cushioning sheet (5).

  Next, an overlying waterproof layer (7) is provided so as to overlap from the deformable sheet (6) to the ventilation cushioning sheet (5).

  Finally, cover the upper end portion of the parapet (1) with a cap (8).

The foam sheet constituting the deformable sheet (6) is obtained by cutting the foam layer of the foam laminate “Zetron” manufactured by Sekisui Chemical Co., Ltd. in the in-plane direction at the center of the thickness. The foam laminate “Zetron” has an average value of the aspect ratio Dz (maximum diameter parallel to the sheet thickness direction) / Dxy (maximum diameter parallel to the sheet width or length direction) of the internal bubbles of 1.4, It consists of a foamed layer made of a polyolefin resin foam having an expansion ratio of 15 and a compressive strength of 4 kgf / cm ² , and a PET reinforcing layer provided on one side of the foamed layer.

1: Parapet 3: Roof plane part 4: Existing waterproof layer 4a: Roof plane part 5: Ventilation cushioning sheet 6: Deformable sheet 7: Overlapping waterproof layer

Claims (3)

  A rooftop modified waterproof structure having a parapet (1), wherein the existing waterproof layer (4) can be deformed from the upper end surface and the inner side surface of the parapet (1) to the portion near the parepet in the rooftop flat surface portion (3) ( A rooftop renovation waterproof structure having a parepet, characterized in that it is continuously covered in 6) and has an overlying waterproof layer (7) on the sheet. The deformable sheet (6) is made of a resin foam sheet, and the foam sheet is an aspect ratio Dz (maximum diameter parallel to the sheet thickness direction) / Dxy (parallel to the sheet width or length direction) of the internal bubbles. A foam layer composed of a polyolefin resin foam having an average value of (maximum diameter) of 1.1 to 4.0, a foaming ratio of 5 to 30 times, and a compressive strength of 2 kgf / cm ² or more; A rooftop renovation waterproofing structure having a parapet characterized by comprising a reinforcing layer provided.     The foam sheet is formed by laminating a reinforcing sheet having a strength capable of suppressing the foaming force in the in-plane direction of the original fabric during foaming on both sides of the original fabric for the foam layer. The roof having a parapet according to claim 1, wherein foaming is performed only in the thickness direction by suppressing foaming in the two-dimensional direction, and the obtained foamed laminate is cut in the in-plane direction with a foamed layer. Renovated waterproof structure.

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