JPH03253669A - Seal tape and seal construction making use thereof - Google Patents

Abstract

PURPOSE:To facilitate sealing work by developing half vulcanizing water expansible rubber material having self-tackiness to add it to a stripping tape, winding the stripping tape in the shape of a swirl, and making it as a sealant for spaces, etc., of a structure in a construction site, etc. CONSTITUTION:A half-vulcanized water expansible rubber material having self-tackiness is so constituted that each of pts.wt. of high water-absorbing resin 1-50, inorganic water-absorbing agent 30-200, tackifier 10-50 and plasticizer 30-200 is compounded against 100 pts.wt. of isobutylene-isoprene rubber and that some vulcanizing agent is added thereto. It is developed to form in the shape of a tape, and it is wound in the shape of a swirl after adding it to a stripping tape 2. After that, a sealant 1 is wound on a core material maintaining a concrete form to seal up those spaces. According to the constitution, water from spaces is prevented, and water leakage can be prevented.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a sealing tape provided to improve water-stopping properties mainly during concrete pouring or backfilling of grout mortar, etc. in concrete structures, and This relates to the seal structure used.

(Conventional technology) Concrete material shrinks in volume during its drying process, and in particular, the separate core material that maintains the spacing between concrete forms does not have good adhesion to the concrete, so water leaks later from the interface between the separate core materials. There is a problem. Therefore, a sealing structure has been proposed in which a sealing material made of a ring-shaped rubber material is fitted in advance to the separate core material to prevent communication of the voids with the outer surface of the concrete when assembling the concrete formwork. However, inserting the ring-shaped sealing material around the outer periphery of the core material is troublesome, and if there is a gap between the center hole of the sealing material and the core material, water may leak through the internal void. Therefore, it is not an essential solution.

In addition, in shield tunnel construction, concrete propulsion pipe construction, etc., in order to assemble concrete members and fill the space behind the structure with backfilling material such as grout mortar, grout holes are pre-filled in the concrete structure. After backfilling, the grout hole is closed with a plug, but in this case, in order to prevent water leakage into the grout hole, water stop tape is wrapped around the screw of the plug. Water-stopping effects have been achieved by attaching a rubber backing or a rubber backing. However, the screws for grout holes are generally larger than the screws for plugs, so wrapping with conventional water-stop tape is troublesome and the water-stopping effect is uncertain. There was a problem in that it had to be screwed in securely so that compressive force would work. Moreover, this cannot be confirmed at the time of the work.

(Problem to be solved by the invention) In this way, even if the volume shrinks during concrete drying during concrete placement, it can be easily attached to the separate core material, and even when wrapped around a plug etc. There is a need for a convenient sealing material made of a rubber material that has sufficient adhesion and flexibility and does not cause cutting.

(Object of the Invention) In order to satisfy the above-mentioned needs, the present invention has discovered that the semi-vulcanized water-swellable rubber has self-adhesiveness and spreadability, and is made into a tape by spreading it. By using this, we aim to make it possible to conveniently use a sealing material that has the ability to follow the air bait of concrete during concrete pouring. We have developed a seal structure that sufficiently and reliably prevents water from leaking from the separate core material for frames, or a seal structure that ensures the water-stopping effect of a plug in a grout hole used for backfilling a concrete structure. This is what we are trying to provide.

(Means for solving !fi) For this reason, in the present invention, semi-vulcanized water-swellable rubber having self-adhesiveness is spread to form a tape, and the tape is attached onto a release tape.

Then, this tape-shaped sealing material is wrapped around the separate core material that holds the space between the concrete forms, and in this state, concrete is filled between the concrete forms and hardened, thereby separating the concrete and the separate core material. constitutes a seal between.

Further, this tape-shaped sealing material is wrapped around the screw thread of the plug so that water is stopped by the sealing material when the plug is screwed into a grout hole provided in a concrete segment.

(Function) In this way, when sticky semi-vulcanized water is used as a sealant in the form of a strong rubber tape, by adding it to the release tape, it imparts a certain shape to the rubber material. Because it can be placed in the same position, it is very convenient and has good workability when used on-site for water-stopping measures that exhibit the ability to follow voids in concrete. And for example,
By wrapping the above-mentioned sealing material around the separate core material installed between the concrete formworks, after the concrete hardens, the above-mentioned sealing material will swell due to water passing through the interface of the separate core material, thereby ensuring water leakage. can be prevented.

Also, when closing a grout hole with a plug after backfilling a concrete structure, the sealing material can be wrapped around the screw of the plug to improve the water-stopping effect. In this case, since the sealing material is excellent in flexibility as well as adhesiveness and water-swellability, it is possible to maintain a reliable water-stopping effect without causing breakage when tightening the plug.

Note that fully vulcanized water-swellable rubber has the property of being difficult to tear, but is not sticky. Furthermore, although unvulcanized water-swellable rubber has adhesive properties, it is easily torn apart, and especially when water-swelled, it falls apart and does not maintain its regular shape. On the other hand, the semi-vulcanized water-swellable rubber used in the present invention has excellent moldability and shapeability when cut into pieces, and has excellent adhesive properties.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to the drawings. The sealing material 1 according to the present invention is made of an adhesive semi-vulcanized water-swellable rubber material formed into a tape shape, and is attached to a release tape 2 to a desired thickness, and if necessary, As shown in Figure 1, it is stored in a spiral shape. In this case, the semi-vulcanized water-swellable rubber material contains 1 to 50 parts by weight of a super absorbent resin, 30 to 200 parts by weight of an inorganic water absorbing agent, and 10 parts by weight of a tackifier to 100 parts by weight of butyl rubber.
~50 parts by weight, 30 to 200 parts by weight of a plasticizer, and some vulcanizing agent, for example 0.1 to 5 parts by weight. This rubber material has mechanical and physical properties such as a tensile strength (Tb) of 30 kgf/c or less, a 100% modulus of 1 kgf/crn" or more, and an elongation at break (Eb) of 3.
00% or more, and has a degree of expansion (S) of 1.5 to 5.0.

Note that the degree of swelling (S) is expressed by the formula % (where, Wo is the weight in the dry state, and W+ is the weight after immersion in tap water.
This is the weight after treatment. ) The above-mentioned butyl rubbers include butyl rubbers, especially those with an unsaturation degree of 0.3 to 3.0 mol%, and halogenated butyl rubbers such as chlorinated butyl rubber and brominated butyl rubber, especially those with an unsaturation degree of 0.3 to 3.0 mol%. 1 to 3.0 mol%, halogen content 0.3 to 3.0% by weight, polyisobutylene, especially viscosity average molecular weight 50,000 to 2,50
0,000, but particularly preferred is brominated butyl rubber, which has high reactivity.

Further, examples of super absorbent resins include polyacrylic acid-based resins, modified polyvinyl alcohol-based resins, vinyl alcohol acrylic acid copolymers, and olefin-maleic anhydride-based resins. This amount is usually 1 to 50 parts by weight, preferably 5 to 4 parts by weight, per 100 parts by weight of butyl rubber.
It is preferable that the content is in the range of 0 parts by weight.

Examples of inorganic water absorbing agents include anhydrous silicic acid, hydrous silicic acid, silicic acids such as silicates, and bentonites containing montmorillonite as a main component. This is usually 30 to 2 parts by weight per 100 parts by weight of butyl rubber.
00 parts by weight, but preferably in the range of 50 to 150 parts by weight.

Examples of tackifiers include petroleum-based resins such as aliphatic, aromatic, alicyclic, copolymerized, and hydrogenated resins; terpene resins such as polyterpene and terpene phenol resin;
Xylene resins such as modified xylene resins, alkylphenol resins, phenolic resins such as modified phenol resins, coumaron-indene phase resins, rosin resins such as rosin, modified rosin, shellac, dammar, copal, polybutene, polyisobutylene, liquid polychloroprene,
Examples include liquid polybutadiene.

This is usually 10 parts per 100 parts of butyl rubber.
~50 parts by weight, preferably 15-40 parts by weight.

Examples of plasticizers include paraffinic, naphthenic,
Examples include aromatic and other mineral oils, phthalate plasticizers, phosphate ester plasticizers, adipate plasticizers, sebacate plasticizers, stearic acid, palmitic acid, castor oil, cottonseed oil, rapeseed oil, paraffin, and chlorinated paraffin. .

This is usually 30 to 100 parts by weight of butyl rubber.
The amount is 200 parts by weight, preferably 5o to iso parts by weight.

Examples of the vulcanizing agent include sulfur, methylolated alkylphenol resin, modified phenol 1MFM such as brominated alkylphenol resin, and thiurams such as tetramethylthiuram disulfide and tetramethylthiuram monosulfide. This is butyl rubber 10
The amount is usually 0.1 to 5 parts by weight, preferably 0.3 to 2.0 parts by weight.

The rubber material of the present invention having such a composition is a sticky and water-swellable mixture, which is sufficiently kneaded using a suitable pressure kneader, formed into a tape shape, and semi-cured. By sulfurizing it, it is gathered into the shape of a sealant and attached to a release tape.

Such sealing materials are used in the following seal structures during concrete pouring. That is, as shown in FIG. 2, for the concrete filling space 5 formed by the concrete formwork 3.4, before concrete pouring, a separate plate is installed to maintain the dimensions between both concrete formworks 3.4. The core material 6 is attached, but this separate core material 6
, the sealing material 1 is peeled off from the release tape 2 and wound and adhered to the intermediate portion of the tape with an appropriate length and thickness. The above-mentioned separate core material 6 usually has male threads 6a formed at both ends, into which a first nut 6b serving as a spacer is screwed, and a second nut 6c is threaded through the concrete formwork 3.4, and the above-mentioned concrete It has a structure in which the formworks 3 and 4 are fixed, and after wrapping the sealing material 1 as described above, concrete is poured. After the concrete has hardened, remove the second nut 6c and remove the concrete formwork 3.
Even if the separate core material 6 is left in the concrete when the seal material 4 is removed, the gap between the separate core material 6 and the concrete (which is caused by shrinkage of the concrete as it dries) is blocked by the swelling of the seal material 1. Moreover, since it is closed by its elasticity, there is no fear that wood will later infiltrate through the periphery of the separate core material 6. Moreover, since the sealing material 1 is tape-shaped and has adhesive properties, it can be easily attached to the separate core material 6 even after the concrete formwork 3.4 has been assembled, and its installation can be done depending on the length, thickness, etc. This can also be adjusted in any way by changing the winding condition of the sealing material 1.

In particular, the rubber material used in the sealing material 1 according to the present invention is in an alkaline region with respect to moisture that has leached out of concrete or that has penetrated through it, so it expands more than fresh water. This is more advantageous because it tends to be faster.

Further, such a sealing material is also employed when filling the outside of a concrete segment 7 in a concrete structure, for example, tunnel construction, with a backfilling material 8 such as graft mortar (see FIG. 3). For this backfilling, a grout hole 9 must be placed in the concrete segment 7.
is formed in advance, and a female cap 10 is attached thereto. After filling the backfilling material 8 from the grout hole 9 through this cap 10, the cap 10
, the plug 11 is screwed together to close the grout hole 9, but at this time, the screw 11 of the plug 11
4, the sealing material 1 is peeled off from the release tape 2, wound and adhered. With this green shape, when the plug 11 is screwed into the female thread 10a of the cap 10 and tightened, the sealing material 1 will not fall off from the plug 11 due to its adhesive force, and the sealing material 1 will not fall off due to its flexibility. , it fully adapts to the screw 11a, deforms, and fills the gap between it and the female screw 10a. And even if water enters, due to the water swelling,
It is effective in preventing this, and even if the seal location changes afterwards, the elasticity will stop the water from flowing.

In addition, in the above embodiment, sealing of the inlet part in the grouting method of shield tunnel and propulsion pipe was explained, but for example, it can be applied to a storage tank for water or mortar waste, etc.
It goes without saying that the sealing material of the present invention can be employed as a sealing material for a threaded part of an entrance/exit of a water tank or the like, or as a sealing material for a threaded part of a water supply, hot water supply, drainage equipment, household appliances, etc.

(Effects of the Invention) As detailed above, the present invention is a sealing material made from a rubber material that is sticky and has semi-vulcanized water-swellability, and has a sealing structure using the same. It has a sufficient water-stopping effect, and since it is preformed into a tape shape and attached to a release tape, it is ideal for on-site use, and its uses can be expanded considerably. In addition, even after sealing, since there is a water expansion effect, even if there is some variation in the sealed location, the seal exhibits expansion ability to follow this and does not impair water-stopping properties.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a sealing material according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a sealing structure in which the above-mentioned sealing material is used for sealing during concrete pouring, and FIG. 3 is a perspective view of the above-mentioned sealing material. Fig. 4 is an enlarged view of the main parts of the same. 1-Sealing material, 2-Peeling tape, 3.4-Concrete formwork, 5-Space, 6-Separate core material, 7-Concrete segment 8-Backfilling material, 9-Gout hole, 10-Cap, 11-Plug .

Claims (5)

[Claims] (1) A sealing tape characterized in that it is formed into a tape shape by spreading semi-vulcanized water-swellable rubber having self-adhesive properties, and is attached to a release tape. (2) The semi-vulcanized water-swellable rubber is butyl rubber 100%
1 to 50 parts by weight of super absorbent resin, 30 to 200 parts by weight of inorganic water absorbing agent, 10 to 50 parts by weight of tackifier, 30 to 200 parts by weight of plasticizer, and some vulcanizing agent. The sealing tape according to claim 1, which is a semi-vulcanized molded product of the blended mixture. (3) A semi-vulcanized water-swellable rubber in the form of a self-adhesive tape or sheet is wrapped around the separate core material that holds the space between the concrete formworks and adhered to it. A seal structure characterized by forming a seal between concrete and a separate core material by filling and solidifying concrete. (4) After filling a backfill material such as grout mortar from the grout hole provided in the concrete segment to the opposite side of the concrete segment, a plug is attached to the grout hole to prevent the backfill material from flowing out. In the seal structure, a self-adhesive tape-shaped semi-vulcanized water-swellable rubber is wrapped around the screw thread of the plug and screwed into the grout hole to form a seal around the plug. A seal structure characterized by: (5) The semi-vulcanized water-swellable rubber is butyl rubber 100%
Add 1 to 50 parts by weight of a super absorbent resin, 30 to 200 parts by weight of an inorganic water absorbing agent, 10 to 50 parts by weight of a tackifier, 30 to 200 parts by weight of a plasticizer, and some vulcanizing agent. 5. The seal structure according to claim 3, wherein the seal structure is a semi-vulcanized molded product of a mixture blended with the above ingredients.