JPH048790A - Cut-off material of joint part of structure and cut-off - Google Patents

Abstract

PURPOSE:To obtain the title cut-off material having ready application, high durability, adhesivity and sealing properties, by covering foam of rubber, etc., with a vulcanized rubber sheet and sticking a tacky uncrosslinked synthetic rubber-based sealing material of definite form to a part to which a substrate is bonded. CONSTITUTION:Foam of rubber or plastic (preferably semi-open cell sponge material consisting essentially of ethylene propylene copolymer rubber) is wrapped in a crosslinked sheet and a tacky uncrosslinked synthetic rubber-based sealing material of definite form preferably containing a polymer substance having high water absorbing properties is stuck to a part to which a substrate is bonded to give the objective cut-off substance. Precast concrete panels, ALC panels, sizing materials, concrete segments for tunnel and concrete slab for railway may be cited as structure in which the cut off material is used.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for waterproofing joints in precast concrete panels, ALC panels, siding materials, concrete segments for tunnels, concrete slabs for railways and bridges, and the like.

<Conventional technology and its problems> Conventionally, the water sealing method for joints of precast concrete panels, ALC panels, siding materials, concrete segments for tunnels, concrete slabs for railways and bridges, etc. has been filled with 5 sealants. Although this is common, there is a method of sandwiching adhesive non-vulcanized synthetic rubber standard sealing material S to simplify the construction (Fig. 1-A), and a method as shown in Japanese Utility Model Publication No. 49-10524. Butyl rubber adhesive layer S around sponge rubber P
There is a method of using a backing rubber with a composite structure, such as one wrapped with rubber (I!1-B).

In addition, in consideration of the expansion and contraction of the joint, a vulcanized rubber sheet r with a width several times the width of the joint is fixed in advance with adhesive α, and after inserting the back-up material 6 on top of it, the sealing material C is applied. The construction method (Figure 1-○) is also being used.

However, these construction methods have the following problems.

In other words, in the method of sandwiching the standard sealing material S, it does not make sufficient contact with the surface to be adhered due to the unevenness of the base, which can easily cause water leakage accidents, and it also has poor elasticity, so it can be easily damaged if there is large movement at the joint. It will be cut and the sealing effect will be lost.

In the case of a composite with sponge rubber P as the core material, the adhesive area with the base is increased due to the restoring force of the internal sponge, improving sealing performance, and it also has the characteristic of being able to follow the movement of the joint. , core sponge rubber p
Because it has a closed cell structure, there is no volume change due to compression, so it cannot be loaded smoothly into narrow joints. Therefore, when applied to existing joints, there is no flexibility in dealing with variations in joint width. In addition, since the unvulcanized rubber is exposed, it has poor weather resistance, and unless a finishing material is applied, the unvulcanized rubber ages and the sponge rubber core material ages, resulting in low durability.

In addition, in the construction method using vulcanized rubber as the secondary seal, the secondary seal part has sufficient elasticity and is excellent in durability, but the -second seal part C is susceptible to vibration and easily breaks. As a result, water accumulates in the secondary seal, causing water leakage. In addition, the construction process, including pre-adhesion treatment, adhesive application and drying, is complicated and takes a long time, and the recent shortage of sealant installers has become a serious problem. The present invention has been made with the aim of eliminating the above problems.

Means for Solving the Problems> The present invention is a rubber or plastic foam wrapped in a vulcanized rubber sheet, and an adhesive non-vulcanized synthetic rubber standard sealing material is pasted on the part to be adhered to the base. It has a structure as shown in Figure 2.

The rubber or plastic foam 1 is preferably one that is highly flexible and has resilience, such as ethylene propylene copolymer rubber sponge, chloroprene rubber sponge,
Examples include soft urethane foam and polyethylene foam. Among these, ethylene propylene copolymer rubber sponge is preferred.

More specifically, 5 the sponge rubber has an expansion ratio of 5 to 15 times, is composed of at least 60% open cells, and has a foaming ratio of 5 to 15 times.
It is most preferable that the compression hardness at the time of % compression is 5 to 250 g/an'. A specific example of such a rubber sponge is Pat Sealer (trade name of semi-open foam sponge manufactured by Sekaicho Co., Ltd.).

These semi-open foam sponge rubbers are flexible and have excellent followability because their volume decreases when compressed. If such a sponge body is used as a core, loading into narrow joints can be carried out extremely smoothly and reliably.

The vulcanized rubber sheet 2 may be a general-purpose waterproof sheet such as an ethylene propylene copolymer rubber sheet or a chloroprene rubber sheet with a thickness of about 0.5 to 2.0 mm, which is used for roof waterproofing work of ordinary buildings, or Examples include polyvinyl chloride sheets that function equally well as these. The adhesive 3 between the foam 1 and the vulcanized rubber sheet 2 may be a chloroprene rubber solvent-based adhesive (for example, Sekaicho Co., Ltd., trade name Everbond NP 2), an acrylic emulsion-based adhesive, or a contact-type adhesive. Adhesive can be used.

Butyl rubber as shown in Table 1 is suitable as the adhesive non-vulcanized synthetic rubber standard sealant 4 that serves as a water-stopping layer and adheres to the base, and is processed by normal methods such as calendering and extrusion processing. with thickness 0.5-2.0mm
Preferably, one molded to 0.8-1.0 mm is used. This one again.

It can be used in place of the contact type adhesives mentioned above when wrapping foam with vulcanized rubber.

The adhesive non-vulcanized synthetic rubber-based regular sealing material composition further includes an acrylic acid/vinyl alcohol copolymer, a sodium acrylate polymer, a polyethylene oxide,
Water swelling properties can be imparted by blending approximately 10% of a 1-id modified product or other super absorbent polymer. By doing so, the sealing material 4 can more reliably exhibit a water-stopping effect in order to achieve the object of the present invention. That is,
Even if the repulsive force of the foam is insufficient and the sealant cannot reach every corner of the small voids that occur at the interface with the substrate, the rubber layer expands in the presence of water, so High sealing performance is obtained by the expansion pressure. In this case, it is more effective to apply a chloroprene rubber contact type adhesive to the base in advance.

The overall thickness of the composite waterproofing material of the present invention is usually about 2 times the joint width.
A double diameter one is preferable.

With the above configuration, the present invention brings about the following effects. That is, the repulsive force of the foam 1 presses the standard sealant 4 against the underlying surface, so it goes without saying that the sealing effect is high, and since the foam 1 is covered with a weather-resistant vulcanized rubber sheet 2, it will not deteriorate due to aging. It is difficult to remove, maintains repulsive force over a long period of time, and has high durability in terms of adhesion and sealing performance between the standard sealant and the underlying surface.

In use, the release paper 5 is removed and then the standard sealant 4 is pasted onto the base 6 due to its self-adhesive properties, or if the joint 7 has already been formed, it is pushed in while removing the release paper. Since it can be simply removed, complicated work processes can be omitted, and it can be easily installed even by specialized craftsmen.

<Example 1> Ethylene propylene copolymer rubber foam (trade name: Panto Sealer, manufactured by Sekaicho Co., Ltd.) 1 with a cross section of 35 x 35 m
It was cut into a length of 2 m, and a vulcanized sheet of ethylene propylene copolymer rubber (thickness: 1.0 mm) 2 was wrapped around it and adhered. For this bonding, Everbond NP~2 (adhesive)
3 was applied to only the two opposing sides of the semi-fast foam and the part of the vulcanized rubber sheet that contacted them to adhere them to each other. Separately.

The sticky unvulcanized butyl rubber having the composition shown in Table 1 was placed on a release paper using a calender with a long piece of 1.0 mm thick. Two pieces of 35 mm thick and 2 m long were cut out, and the above was prepared. Opposing 2 with vulcanized rubber sheets 4, 4 attached
The butyl rubber sheet was attached to each surface from the outside to obtain a product of the present invention as shown in FIG. 5 is release paper.

Apply a chloroprene rubber contact type adhesive to the base side of a 20mm precast concrete joint, turn over the edge of the release paper by 50mm, push the whole thing into the joint, and then grasp the edge of the release paper. It was removed and the joints were sealed.

Table 1 Butyl rubber Regenerated butyl rubber Polybutene Tackifying resin Frocess oil Calcilum carbonate 25.01ji parts 12, 08, 08, 04, 042, 6 Example 2 The procedure was carried out according to Example 1. At that time, in order to impart water-swellability to the adhesive non-vulcanized butyl rubber composition shown in Table 1, the composition shown in Table 2 was used.

Table 2 butyl rubber recycled butyl rubber Bobten Tackifying resin Frose oil Calsulaum carbonate anti-aging agent Acrylic acid heenyl alcohol copolymer needle 22゜ 9゜ 8゜ 8゜ 4゜ 38° 0° 10° 100°

[Brief explanation of drawings]

111A-C are conventional water-stopping materials, FIG. 2 is an example of the water-stopping material of the present invention, I! Figure 3 is a sectional view showing the construction state. Foam vulcanized rubber sheet Adhesive Standard sealing material Release paper Base joint adhesive Back amplifier material Sealing material Sponge rubber Vulcanized rubber sheet Butyl rubber adhesive or higher

Claims (5)

[Claims] (1) Water-stopping material for building joints, which is made by wrapping rubber or plastic foam in a vulcanized rubber sheet and pasting an adhesive non-vulcanized synthetic rubber standard sealant on the part that will be adhered to the base. (2) The composite water stop material according to item 1, wherein the foam is a semi-open foam sponge body mainly composed of ethylene propylene copolymer rubber. (3) The composite water stop material according to item 1 or 2, wherein the adhesive non-vulcanized synthetic rubber composition contains a superabsorbent polymer substance. (4) A water-stopping construction method for joints in a structure, characterized by applying the composite water-stopping material described in item 3 to the joints of the structure. (5) The structure is precast concrete panels, AL
The water stop construction method according to item 4, which is a C panel, siding material, concrete segment for tunnel, or concrete slab for railway or bridge.