JP3200985B2 - Waterproof sheet for thermal insulation and waterproofing and method for thermal insulation and waterproofing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for forming a heat insulating layer made of foamed resin between a waterproof sheet stretched on a primary lining concrete wall surface in a tunnel and a secondary lining concrete, thereby forming a freezing spring. More specifically, the present invention relates to a waterproof sheet capable of forming a heat insulating layer made of a foamed resin with good adhesiveness, and a heat insulating and waterproofing method using the same. About.

[0002]

2. Description of the Related Art
In the tunnel construction, as shown in FIG. 4, a primary lining concrete b is cast on the ground a of the tunnel, a waterproof sheet is stretched on the primary lining concrete b, and a secondary lining is applied from above. Concrete d is poured to prevent spring water from the primary lining concrete side (spring from the ground into the tunnel) from leaking to the secondary lining concrete side. However, in cold regions such as Hokkaido, when such waterproofing is performed, spring water freezes between the primary lining concrete b and the waterproofing sheet c to press the secondary lining concrete d, and the secondary lining concrete d is pressed. Cracks, cracks, etc. may occur in the concrete d. Therefore, in such a cold region, as shown in FIG. 5, before the secondary lining concrete d is cast, a foamed resin material such as a foamed resin, for example, a foamed urethane resin, a foamed vinyl chloride resin, etc. is placed on the waterproof sheet a. Is injected and foamed to form a heat insulating layer e to prevent spring water from freezing.

[0003] However, the foamed resin forming the heat insulating layer has no adhesiveness to the synthetic resin of the waterproof sheet, and cannot be integrally bonded to the waterproof sheet surface. For this reason, the operation of forming the heat insulating layer and the operation of placing the secondary lining concrete are extremely difficult.

[0004] For this reason, the present applicant has previously used a waterproof sheet having a water-impermeable sheet having a surface tension of 30 dynes / cm or more on the heat-insulating layer forming side (Japanese Patent Laid-Open No. 2-88891). JP-A-2-888), forming a coating made of a coating material obtained by mixing an inorganic resin powder with an acrylic acid resin coating material on the surface on the heat-insulating layer forming side of the water-impermeable sheet.
No. 92) has been proposed, but there is a demand for the development of a heat insulating and waterproofing construction method that can more firmly support the heat insulating layer.

[0005] The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a waterproof sheet capable of forming a heat insulating layer made of a foamed resin with good adhesiveness, and a method of performing heat insulating and waterproofing excellent in workability by easily using the waterproof sheet.

[0006]

According to the present invention, in order to achieve the above object, a waterproof sheet provided with a water-impermeable sheet is stretched on a primary lining concrete wall, and the water-impermeable sheet surface of the waterproof sheet is provided. A waterproof sheet used for a thermal insulation waterproofing method in which a heat insulating layer made of a foamed resin is formed and a secondary lining concrete is cast on the heat insulating layer, the surface of the water impermeable sheet on the heat insulating layer forming side has flexibility. While a large number of synthetic resin-made linear bodies having irregular cross-sections are arranged irregularly in the surface direction and the thickness direction of the water-impermeable sheet to form a three-dimensional wave, and at the intersection of these many linear bodies At least a part of the three-dimensional mesh body having undulating irregularities bonded to each other and having a mesh size of 1 to 30 mm is bonded and laminated, and when the heat insulating layer is formed, the heat insulating layer The inner surface invades the three-dimensional mesh And TakashiHiroshi its internal communication space and,
A waterproof sheet for thermal insulation and waterproofing, wherein a heat insulating layer is supported by the net by wrapping a lattice of the net.

In this case, it is effective to form at least a part of the undulating irregularities of the mesh so as to be equal to the thickness of the heat insulating layer to be formed. It is also preferable to laminate a water-permeable sheet on the surface of the water-impermeable sheet opposite to the side on which the heat insulating layer is formed.

Further, according to the present invention, a waterproof sheet having a water-impermeable sheet is stretched on the primary lining concrete wall surface, and a heat insulating layer made of a foamed resin is formed on the water-impermeable sheet surface of the waterproof sheet. In the thermal insulation waterproofing method in which secondary lining concrete is cast on the thermal insulation layer, a large number of flexible synthetic resin linear bodies are formed on the surface of the water-impermeable sheet on the side where the thermal insulation layer is formed as a waterproof sheet. Undulating irregularities that are randomly arranged in the plane direction and thickness direction of the water-impermeable sheet while intersecting with each other and arranged in a three-dimensional wave shape, and at least some of the intersections of these many linear bodies are bonded to each other. The three-dimensional net having a mesh size of 1 to 30 mm is used by bonding and laminating, a foamed resin material is supplied to the three-dimensional net, and a part of the raw material is placed in the three-dimensional net. Infiltrating and foaming The inner surface of the heat insulating layer made of the foamed resin fills the internal communication space of the mesh, and the heat insulating layer is supported by the mesh by wrapping the grid of the mesh. Provide a way.

[0009]

According to the heat insulating and waterproofing construction method of the present invention, a sheet-like three-dimensional net having the above-mentioned undulating irregularities on the primary lining concrete and having a mesh size of 1 to 30 mm is formed on the heat insulating layer forming side. A three-dimensional mesh having a mesh size of 1 to 30 mm is formed by stretching a bonded waterproof sheet, supplying a foamed resin material to the surface of the mesh, and foaming the foam. By supplying a foamed resin raw material to the body, a part of which is penetrated into the three-dimensional mesh body and foamed, the inner surface portion of the heat insulating layer made of the foamed resin fills the internal communication space of the mesh body, The heat insulating layer is supported by the net by wrapping the grid of the net.

Therefore, the heat-insulating layer made of the foamed resin is integrated with the water-impermeable sheet through the above-mentioned net-like body, and the heat-insulating layer made of the foamed resin is formed on the waterproof sheet with good adhesiveness, so that peeling does not easily occur. .

For this reason, the effect of the heat insulating layer is favorably exhibited over a long period of time, and the heat insulating layer can be formed simply by supplying and foaming the foamed resin raw material. Construction is performed efficiently, and in-situ foaming of a foamed resin material for forming a heat insulating layer is easy.

In this case, it is possible to control the thickness of the heat insulating layer by partially forming the height of the undulating irregularities of the mesh body to be equal to the thickness of the heat insulating layer. Accidents can be prevented. Also,
If the waterproof sheet is formed by laminating a water-permeable sheet on the surface opposite to the heat-insulating layer forming side of the water-impermeable sheet, the water-permeable sheet abuts the construction wall when the waterproof sheet is stretched on the construction wall. Then, if it is fixed with concrete nails or the like, the waterproof sheet can be stretched on the construction wall.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a waterproof sheet 1 according to one embodiment of the present invention.
A water-permeable sheet 3 is disposed on one side of the sheet, and a sheet-like three-dimensional net-like body 4 having undulating irregularities is bonded and laminated on the other side.

Here, as the water-impermeable sheet 2 constituting the waterproof sheet 1, a synthetic resin sheet such as polyvinyl chloride, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and the like is preferable. And its thickness is preferably 0.1 to 3 mm.

The reticulated body 4 is made of a flexible wire such as a synthetic resin fine wire such as polyamide, polyester, or polyolefin such as polyethylene or polypropylene, or a composite synthetic resin fine wire obtained by coating a metal wire with a synthetic resin such as polyvinyl chloride. While a large number of linear bodies made of synthetic resin having crossing each other are arranged irregularly in the plane direction and the thickness direction of the water-impermeable sheet in a three-dimensional wave shape while intersecting each other, the intersections of these many linear bodies It has undulating irregularities at least partially adhered to each other, and has a mesh size of 1 to 30 mm, preferably 3
It is formed as a three-dimensional mesh sheet of 10 mm to 10 mm, and has shape retention and rigidity for maintaining such a shape.

In this case, it is preferable that the thickness of the linear body constituting the mesh body 4 is 0.1 to 3 mm, and the height (thickness) of the mesh body 4 is 3 to 70 mm. Especially 3-2
Preferably, it is 0 mm.

In the net-like body 4, a part or all of the water-impermeable sheet 2 and a portion in contact with the water-impermeable sheet 2 are bonded and laminated by means such as heat bonding and hot melt.

Further, as the water-permeable sheet 3 disposed on the surface of the impermeable sheet 2 on the side of the primary lining concrete casting, a water-permeable sheet usually used as a water-permeable layer of a waterproof sheet can be employed. Nonwoven fabrics having properties are suitable. Also,
The thickness is preferably 1 to 10 mm, but is not limited to this. In addition, this water permeable sheet 3
Are partially bonded 6 to the impermeable sheet 2.

Next, when performing insulation and waterproofing using the waterproof sheet 1, as shown in FIG. 2, the waterproof sheet 1 is applied to the wall surface of the primary lining concrete 7 cast on the ground 6, as shown in FIG. 3 is fixed by a concrete nail or the like so as to abut against the wall surface of the primary lining concrete 7, and is stretched. Then, the polyurethane is placed on the mesh 4 which is adhered and laminated on the other surface of the impermeable sheet 2 of the waterproof sheet 1. A heat-insulating layer 8 is formed by supplying a foaming resin material such as polyvinyl chloride resin that can be foamed on site, and foaming is performed. A secondary lining concrete 9 is cast on the heat-insulating layer 8.

In this case, as described above, the three-dimensional net is irregular in the plane direction and the thickness direction of the water-impermeable sheet while a number of flexible synthetic resin linear bodies cross each other. Are arranged in a three-dimensional wave shape by changing the direction, at least a part of the intersections of these many linear bodies has undulating irregularities bonded to each other, and the size of the mesh is 1 to 30 m.
m, so that by supplying the foamed resin raw material onto the three-dimensional net, a part of the foam enters and foams into the three-dimensional net, and a heat insulating layer made of the foamed resin is formed. When formed, the heat insulating layer is supported by the mesh by the inner surface of the heat insulating layer being present in the three-dimensional mesh to fill the internal communication space and wrapping the grid of the mesh. . Therefore, the heat insulating layer is integrated with the net, and the net is adhered to the water-impermeable sheet. Therefore, the heat insulating layer is held with good adhesiveness to the water-impermeable sheet via the net.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the thickness of the heat insulating layer 8 which forms at least a part of the height of the undulating irregularities of the net 4 is equal to the thickness. Thus, the thickness of the heat insulating layer 8 can be controlled, and an accident such as icing due to partial thickness shortage can be prevented.

The present invention is not limited to the above embodiment. For example, in the construction of the waterproof sheet, the water-permeable sheet is entirely adhered to the water-impermeable sheet, and in some cases, the water-permeable sheet is provided. Can be omitted, and other configurations may be variously changed without departing from the gist of the present invention.

[0023]

As described above, according to the present invention,
A large number of linear bodies intersect each other and extend from one to the other in an irregular direction in the horizontal and thickness directions and extend from one to the other. The heat-insulating layer is formed on the waterproof sheet with good adhesiveness by bonding and laminating a net having a corrugated unevenness and a mesh size of 1 to 30 mm on one surface of the water-impermeable sheet.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a waterproof sheet according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a heat-insulating waterproof structure constructed by the waterproof sheet.

FIG. 3 is a sectional view showing an example of a heat-insulating waterproof structure using a waterproof sheet according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a waterproof structure in a conventional tunnel construction.

FIG. 5 is a cross-sectional view showing a heat-insulating waterproof structure in a conventional tunnel construction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproof sheet 2 Water impervious sheet 3 Water permeable sheet 4 Net-like body 5 Partially bonded part 6 Ground 7 Primary lining concrete 8 Heat insulation layer 9 Secondary lining concrete

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-59532 (JP, A) JP-A-63-315799 (JP, A) Full-scale application Showa 55-90434 (JP, U) (58) Field (Int. Cl. ⁷ , DB name) E21D 11/38

Claims (4)

(57) [Claims] A waterproof sheet having a water-impermeable sheet is stretched on a primary lining concrete wall, and a heat insulating layer made of a foamed resin is formed on the water-impermeable sheet surface of the waterproof sheet. In the waterproofing sheet used for the insulation and waterproofing construction method in which the secondary lining concrete is cast, a large number of flexible synthetic resin linear bodies intersect with each other on the surface of the impermeable sheet on the side where the heat insulating layer is formed. While irregularly changing the directions in the plane direction and the thickness direction of the water-impermeable sheet, the water-impermeable sheet is arranged in a three-dimensional wave shape, and at least a part of the intersections of these many linear bodies has undulating irregularities. Then, a three-dimensional mesh having a mesh size of 1 to 30 mm is bonded and laminated, and when the heat insulating layer is formed, the inner surface of the heat insulating layer penetrates into the three-dimensional net and communicates therewith. Fill the space,
A waterproof sheet for thermal insulation and waterproofing, wherein the heat insulating layer is supported by the net by wrapping a lattice of the net. 2. The waterproof sheet according to claim 1, wherein the height of at least a part of the undulating irregularities of the net is formed so as to be equal to the thickness of the heat insulating layer to be formed. 3. The waterproof sheet according to claim 1, wherein a water-permeable sheet is laminated on the surface of the water-impermeable sheet opposite to the side on which the heat insulating layer is formed. 4. A waterproof sheet provided with a water-impermeable sheet is stretched on the primary lining concrete wall, and a heat-insulating layer made of foamed resin is formed on the water-impermeable sheet surface of the waterproof sheet. In a method for heat-insulating and waterproofing in which secondary lining concrete is cast, a large number of flexible synthetic resin linear bodies intersect with each other on a surface on a heat-insulating layer forming side of a water-impermeable sheet as a waterproof sheet. The water-impermeable sheet is arranged in a three-dimensional wave by changing the direction irregularly in the surface direction and the thickness direction, and at least a part of the intersections of these many linear bodies has undulating irregularities bonded to each other, The size of the mesh is 1
A foamed resin material is supplied to the three-dimensional network, and a part of the foamed resin material is introduced into the three-dimensional network to form a foam. A heat insulating and waterproofing construction method, wherein an inner surface of a heat insulating layer made of resin fills an internal communication space of the mesh, and the heat insulating layer is supported by the mesh by wrapping a lattice of the mesh.