JP3036303U - Protective sheet for construction work - Google Patents

Abstract

(57) [Abstract] [Problem] When a waterproof rubber sheet attached to the outer wall of an underground concrete structure refills the excavated space around the outer wall with soil and sand, mixed rocks hit and scratched. We provide a protective sheet for construction work that can reliably prevent sticking and has flame resistance. A foamed plastic sheet (1) is provided with a structure in which a glass fiber cloth (2) and an aluminum foil (3) or a polyester-based plastic sheet (3A) are sequentially laminated on a surface of the foamed plastic sheet (1). Then, the aluminum foil 3 is laminated on the front side of the glass fiber cloth 2 for covering the joint portion where the edges of the protective sheet A are butted against each other, and the adhesive tape layer with release paper is provided on the back side and the joint tape B is attached. You should let me.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is designed to prevent rainwater, etc. that has penetrated from the outer wall of a subterranean concrete structure such as an underground passage, a basement, or a common ditch for lifelines from entering the inner wall of the structure. The present invention relates to a protective sheet for construction work, which is used for the purpose of protecting a rubber sheet for construction from rocks and the like that collide when backfilling the structure.

[0002]

[Prior art]

 Before the concrete structure was built underground, the outer wall of the structure was covered with mortar before the backfilling of the dug up space with soil and sand. However, since this method is labor-intensive and requires acquisition of construction technology, the method of covering with a rubber sheet has become popular these days. However, during the above-mentioned backfilling, there was a possibility that the angular rock blocks mixed with soil and sand would hit the soft rubber sheet and break. Even if there is only one break, the waterproof effect of the entire construction surface will be lost.

Therefore, in order to protect the waterproof rubber sheet from the collision of falling rocks, a protective sheet that covers the outside of the rubber sheet has been devised. This existing protective sheet has a structure in which a so-called "PP cloth", which is plain weave made of polypropylene stretched film, is attached to the surface of a polyethylene foam sheet having a foaming ratio of about 30 times and a thickness of, for example, about 8 mm. There is an adhesive layer with release paper on the back side.

[0004]

[Problems to be solved by the device]

 However, this existing protective sheet also has some problems to be improved. This is because the sharp corners of the falling rock are caught in the PP cloth texture and damage the protective sheet, as well as the rubber sheet that is integrated with the protective sheet via the adhesive layer. It was not uncommon to break even. In addition, it was not uncommon for soil containing water to adhere to the textured and uneven surface of PP cloth, causing the protective sheet to be torn or dragged off due to its weight. Further, unlike the mortar, this all-plastic protective sheet has a high risk of a fire or a fire, including during storage and transportation.

Therefore, an object of the present invention is to construct a concrete structure underground, attach a waterproof rubber sheet to the outer wall surface, and refill the surrounding excavated space with soil or sand. It is to provide a protective sheet for construction work, etc., which can surely prevent the rubber sheet from being damaged by falling rocks and is also flame resistant.

[0006]

[Means for Solving the Problems]

 A protective sheet for construction work or the like according to the present invention for achieving the above-mentioned object is constituted by sequentially laminating a glass fiber cloth 2 and an aluminum foil 3 on a surface of a foamed plastic sheet 1. Instead of the aluminum foil 3, a polyester plastic sheet 3A may be used. Then, on the back surface of the foamed plastic sheet 1, it is preferable to provide an adhesive layer covered with a release paper. Further, in the above-mentioned protective sheet A, an aluminum foil 3 is laminated on the front side of the glass fiber cloth 2 and a pressure-sensitive adhesive layer covered with release paper is provided on the back side in order to cover the butt joint between the protective sheets. B should be attached.

[0007]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the protective sheet A of this example uses a cross-linked and foamed polyethylene foam sheet 1 having a foaming ratio of about 30 and a thickness of 6 mm as a base material. Instead of polyethylene foam, relatively inexpensive foamed plastic having toughness and good impact resilience such as polypropylene foam may be used.

A glass fiber cloth 2 is laminated on the upper surface of the polyethylene foam sheet 1 by heat fusion or adhesion. The glass fiber cloth 2 of this embodiment is a plain weave type which is generally used for glass fiber reinforced plastics (FRP) and the like, but is not limited to this type.

An aluminum foil 3 is laminated on the surface of the glass fiber cloth 2 by adhesion or the like.

A pressure-sensitive adhesive layer 4 is provided on the back surface of the base material 1, and the front surface is covered with a release paper 5.

As shown in FIG. 2, the protective sheet A is abutted with the protective sheets A of fixed length, which cover the surface of the rubber sheet C attached to the outer wall surface of the underground concrete structure D. A seam tape B is attached to cover the seams. This seam tape B has a structure in which an aluminum foil 3 is laminated on the front side of a glass fiber cloth 2 and an adhesive layer 4 with a release paper 5 is provided on the back side. The width dimension of the long seam tape B may be appropriately set depending on the construction situation, for example, around 6 cm.

The comparison of the strength characteristics between the protective sheet A of the above-mentioned example and the above-mentioned conventional protective sheet (E) in which the surface of the polyethylene foam sheet is coated with PP cloth shows that the present invention is as follows. The measurement result that the protective sheet A of 1. is far superior was obtained. "Unit Weight ^{(kg / m 3)":} A = 0.35, E = 0.40, " longitudinal tensile strength (N / 25mm)": A = 691, E = 422, " longitudinal elongation Ratio (%) >>: A = 4.3, E = 25.6

Next, the operation of the protective sheet A will be described. As described above, this protective sheet A protects the waterproof rubber sheet C attached to the entire outer wall surface of the underground concrete structure D from the collision of mixed rocks when backfilling with soil and sand. , For sticking to the entire surface. If necessary, it can be used for curing concrete placed in cold weather, for the purpose of heat insulation and heat retention in various places, and the like.

To attach the protective sheet A to the surface of the rubber sheet C, the release paper 5 attached to the back side of the rubber sheet C may be peeled off and then attached to the sheet surface. The seam portion where the protective sheets A of fixed length are adjacent to each other is brought into a butt state without adopting a method of overlapping a predetermined width as in the conventional technique.

Then, a seam tape B, which is stripped of the release paper 5 on the back side, is attached so as to extend over both sides of this seam line. According to such a seam treatment method, unlike the conventional method in which the protective sheets on both sides are overlapped with each other, no step-like protruding portion is formed, and therefore, rock collides with this step portion and It is possible to eliminate the risk of the protective sheet being peeled off. Also, the required amount of protective sheet can be reduced.

The surface of the protective sheet A is covered with an extremely smooth aluminum foil 3 backed and reinforced with an extremely strong glass fiber cloth 2. Therefore, even when rocks with sharp corners hit the protective sheet A during backfilling with soil and sand, the rocks are often caught in the PP cloth weave on the surface, which was often experienced in the above-mentioned conventional ones. The inconveniences of tearing the sheet, dragging off the sheet, and breaking are almost impossible. Then, the polyethylene foam sheet 1 which is free from damage sufficiently exhibits its excellent cushioning function and reliably protects the rubber sheet C.

Further, since the surface of the protective sheet A is covered with the non-combustible aluminum foil 3, the risk of fire due to fire during storage / transport or at the construction site is significantly reduced.

In the above embodiment, the aluminum foil 3 is replaced with a member of engineering plastics having particularly excellent toughness, for example, a polyester plastic sheet (3A) such as polyethylene terephthalate resin. However, the flame retardancy is inferior, but in other properties, the effects substantially the same as those using the aluminum foil 3 are obtained. Alternatively, the aluminum foil 3 may be backed and reinforced with this plastic sheet.

[0019]

[Effect of the invention]

 As is clear from the above description, the protective sheet for construction work according to the present invention has many advantages as listed below, as compared with the conventional one in which PP cloth and polyethylene foam are laminated. (A) Remarkably excellent strength characteristics and surface smoothness. (B) Therefore, when the space around the underground concrete structure is filled with soil and sand, even if angular rocks collide, the risk of damage to the sheet is significantly reduced. (C) In addition, there is almost no risk that the protective sheet is caught by angular rocks, adheres moisture-containing clay or the like, and damages the sheet or drags it down. (D) As a method for treating the seams of adjacent protective sheets, if the abutted seams are covered with the attached seam tape, unlike the conventional superposition method, no step can be made at the seams, and this also The risk of damage to the protective sheet is significantly reduced. (E) Since the surface is covered with non-combustible material, the safety against a fire during storage / transport or construction is greatly improved.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a protective sheet according to an embodiment of the present invention.

FIG. 2 is a partial perspective view showing a state where a protective sheet is applied using the seam tape.

[Explanation of symbols]

A protective sheet B seam tape 1 polyethylene foam sheet (foamed plastic sheet) 2 glass fiber cloth 3 aluminum foil 3A polyester plastic sheet 4 adhesive layer 5 release paper

Claims (4)

[Utility model registration claims] 1. A protective sheet for construction work or the like, which is formed by sequentially laminating a glass fiber cloth 2 and an aluminum foil 3 on a surface of a foamed plastic sheet 1. 2. A protective sheet for construction work or the like, which is formed by sequentially laminating a glass fiber cloth 2 and a polyester plastic sheet 3A on the surface of a foamed plastic sheet 1. 3. The protective sheet for construction work according to claim 1 or 2, wherein an adhesive layer covered with a release paper is provided on the back surface of the foamed plastic sheet 1. 4. The protective sheet A according to any one of claims 1 to 3, wherein an aluminum foil 3 is laminated on the front side of the glass fiber cloth 2 for covering a butt joint between the sheets, and a release paper on the back side. The protective sheet for construction work according to any one of claims 1 to 3, wherein an adhesive layer covered with is provided with a joint tape B.