JPS6280027A - Method for jointing waterproof sheet in water - Google Patents

Abstract

PURPOSE:To joint a lapped part, by pressing an end portion in a water after a less water-absorptive rubber adhesives is applied on the end portion of one waterproof sheet, and on the end portion of another waterproof sheet the same adhesives is applied or an adhesive tape of naturally curable type is stuck. CONSTITUTION:One waterproof sheet 4 which is bound with an adhesive tape 3 to the end portion of a sheet preliminarily in an air and another waterproof sheet 6 whose end portion is coated with a rubber adhesives 5 are sunk in water toward another surface 2 under a water pressure less than 10mm. Then the ends of the waterproof sheet 4 and the waterproof sheet 6 are superposed. Here after a releasing paper stuck to the surface of the adhesive tape 3 is removed, both waterproof sheets 4, 6 are jointed by pressing with a pressing roller. Each of these operation is done by a diver. And this adhesive tape is one of naturally curable type and is less water, absorptive, preferably made of for example EPT, IIR or blend of these EPT and IIR.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for underwater jointing of waterproof sheets, and more specifically, a rubber adhesive is applied in advance to one of the sheets that will become the joint part of the waterproof sheet in the air. The present invention relates to a method in which a rubber adhesive is applied to the other sheet or a self-vulcanizing adhesive tape is applied to the other sheet, and then the joint is jointed underwater.

(Prior Art) Conventionally, waterproof sheets such as vulcanized rubber sheets or resin sheets have been widely used in the field of civil engineering and construction, but these waterproof sheets have dimensional restrictions depending on manufacturing equipment, and the length Although it is possible to have a width of 200 to 300 m, the width is at most about 2 to 10 m. Therefore, the reality is that these waterproof sheets are joined at a factory or transported to a construction site and then joined together at the site.

However, in the case of offshore reclamation, the method of laying joined sheets on the seabed as described above requires joining a wide-area sheet on land, transporting it by ship, and sinking it to the seabed. However, it is extremely troublesome and labor-intensive work, and therefore underwater jointing of the waterproof sheet is the most rational method for the construction work in which the above-mentioned wide-area sheet is laid on the seabed or underground.

Conventionally, physical fixing methods have generally been used for underwater joints, such as the riveting method in which adhesive is sandwiched between sheet wraps and metal plates are placed on both sides of the sheet and fixed with rivets. A fastener method in which the sections are jointed with a fastener, and a concrete-in-pipe method in which the end of the sheet is inserted into the pipe and filled with concrete have been proposed.

(Problems to be solved by the invention) However, the riveting method and the pipe-in-pipe concrete method require an extremely long time to work underwater, and the reality is that the fastener method has only been put into practical use at present, equivalent to a diving suit. However, if this was used as an underwater joint, it would be expensive, and if kept underwater for a long period of time, there would be problems with durability.

The present invention deals with this situation and employs chemical fixing means instead of the physical fixing means described above, which allows for easy jointing in water and without the use of special jigs. This provides an underwater joint method that greatly improves workability.

(Means for solving the problem) That is, the feature of the present invention is that in the air,
One end of the waterproof sheet is made of ethylene-propylene terpolymer, butyl rubber, or a blend thereof, which has low water absorption. After applying a rubber adhesive and applying the above adhesive to the end of the other waterproof sheet or pasting a self-vulcanizing adhesive tape, submerge the waterproof sheet in water, and then The purpose is to join the lap portions by overlapping and rolling the waterproof sheets with their ends sandwiched.

The method of the present invention is such that the rubber adhesive or adhesive tape is hardly affected by moisture, that is, the adhesive strength between the waterproof sheets does not decrease in water, but rather increases as the rubber adhesive or adhesive tape hardens. It was created by discovering the fact that adhesive strength can be improved, and it can be said that its distinctive feature is that it has shifted from the previous emphasis on adhesion only in the air to adhesion in an underwater environment.

The figure is a vertical cross-sectional view of an underwater sheet joint structure in which the underwater joint method of the present invention was carried out. Rubber adhesive on the edge of the sheet (5)
The other waterproof sheet (6) coated with is submerged into the other side (2) of water (11, usually within a water pressure of 10 mm).

Next, the ends of the waterproof sheet (4) and the waterproof sheet (6) are overlapped, but at this time, after removing the release paper stuck to the surface of the adhesive tape (3), they are rolled by a rolling roller. to join the waterproof sheets (4) and (6) together.

Each of these tasks will be performed by divers.

In addition, in the present invention, 0.1 to 1.0 kg/n of rubber adhesive (5) is applied to the ends of the waterproof sheets (4) and (6).
(It can also be used by painting.

The waterproof sheet used in the present invention is made of, for example, ethylene-propylene-terpolymer (EPT), butyl rubber (I
IR) or a vulcanized rubber sheet made of a blend thereof, or a resin sheet such as VA or PVC.

In addition, the adhesive tape is of a natural vulcanization type and has low water absorption, such as EPT, FIR, or those El'T and I.
Preferred are blends of IR, a vulcanizing agent,
In addition to vulcanization accelerators, adhesives and softeners, stearic acid,
Carbon blank, inorganic filler, ZnO, etc. are mixed and blended as necessary.

Among these, the above-mentioned vulcanizing agents include sulfur-based sulfur-containing compounds such as sulfur, morpholine, disulfide, phosphorus-containing polysulfide, and sulfur chloride, P-quinedioxime, pp'
-Oximes such as dibenzoyl quinone dioxime, or peroxides such as α-cumyl hydroperoxide, methyl ethyl ketone peroxide, hydrogen peroxide, acetylacetone peroxide, t-butyl hydroperoxide, and L-butyl peroxybenzonide. The amount of these vulcanizing agents used is usually 1 to 6 parts by weight per 100 parts by weight of the rubbery polymer. In addition, vulcanization accelerators include thiazole types such as 2-mercaptohendithiazole and dibenzothiacyl disulfide, and thiuram types such as tetramethylthiuram monosulfide, tetramethhiuram disulfide, and dipentamethylenethiuram hexasulfide. , or dithiocarbamate series such as Zn-di-n-butyldithiocarbamate, pbo 2, trimene base, and the like.

The amount of these vulcanization accelerators used is usually 2 to 10 parts by weight per 100 parts by weight of the rubbery polymer.

Furthermore, as the adhesive to be mixed, aromatic hydrocarbon resins such as Vetrozin (manufactured by Mitsui Petrochemicals), which is a petroleum-based hydrocarbon resin, and aliphatic cyclic hydrocarbons such as Hiresotsu (manufactured by Mitsui Petrochemicals) are used. , Escoresot (Esso Chemical Co., Ltd.)
>, hydrocarbon-based tackifying resins such as Tac Ace (manufactured by Mitsui Petrochemicals), and phenol resins such as phenol formaldehyde resins. The amount of these adhesives used is 30 to 100 parts by weight per 100 parts by weight of the rubbery polymer.

Also, known softeners are used with these adhesives, typical examples of which are process oil, polybutene, liquid paraffin, pine cool,
There are also other petroleum-based high boiling point compounds. The amount of these softeners used is 30 parts by weight per 100 parts by weight of the rubbery polymer.
~150 parts by weight.

In addition, as a compound for a self-vulcanizing type adhesive tape with a relatively fast vulcanization rate, an oxime type compound such as P-quinone dioxime or P-P''-dibenzoyl quinone dioxime is added to 100 parts by weight of the rubbery polymer. 1 to 2 parts by weight of vulcanizing agent,
PBO 2 vulcanization accelerator 3-4 parts by weight, adhesive 30-1
00 parts by weight, and 30 to 150 parts by weight of a softening agent such as process oil may be added.

On the other hand, as for a relatively slow natural vulcanization type adhesive tape formulation, it is
, morpholine disulfide, phosphorus-containing polysulfide,
1 to 3 parts by weight of a sulfur-based vulcanizing agent selected from sulfur chloride, etc.;
2 to 6 parts by weight of a vulcanization accelerator selected from thiazole, thiuram, or dithiocarbamate, and 30 to 6 parts by weight of an adhesive.
100 parts by weight, 30-150 parts of softening agent such as process oil
Parts by weight may be added.

This adhesive tape has an initial strength of the joint part of the waterproof sheet, that is, a self-retention strength of 1 to 3 kg f/25 cm.
Without this self-adhering force, when the joined waterproof sheets are pulled during construction of an underwater joint, the waterproof sheets will shift and change at the joint. Therefore, in order to satisfy this self-rejuvenating power, the adhesive should be added at 30 to 10 parts per 100 parts of rubbery polymer.
Add 0 parts by weight to give surface tack, and further add 30 parts by weight of softener.
~150 parts by weight is added to increase the Mooney viscosity (M
Ll+s 100°C) must be in the range 4-25.

The thickness of this adhesive tape should be 0.5 to 2 mm; if it is 2 mm or more, it is not preferable because a step will be created between the waterproof sheets at the joint and they will be likely to peel off at the initial stage of joining.

On the other hand, rubber adhesives are EPT, llR1, which has low water absorption.
Vulcanizing agent similar to the above adhesive tape for chlorinated butyl rubber, etc.
It is a naturally vulcanizable liquid adhesive in which vulcanization accelerators and the like are blended as necessary, and the composition is dissolved in a normal solvent such as toluene, and the viscosity is 30.0 OO depending on ease of application.
CPS, preferably 1O~30,0oocps (
Also, from the viewpoint of water effect (adhesiveness) in water, the solid content is preferably 8% or more, preferably 8 to 25%. The amount of the above rubber adhesive applied is 0.1 to 1.0 kg/? That's about it.

In the present invention, adhesive tape is attached to the joints of the waterproof sheets and release paper is pasted thereon, or a rubber adhesive is applied to the joints of the waterproof sheets, and then these waterproof sheets are soaked in fresh water, seawater, etc. Submerge in water. After that, the joined ends of the waterproof sheets are overlapped by the diver, and at the same time, the release paper is peeled off and the lap part is rolled with a rolling pressure roll.If the lap part is pressed with a roller etc., the waterproof sheets will bond It is also desirable for improved strength as well as for removing moisture present between the tarpaulins.

In addition, as time passes, the adhesive tape and the rubber adhesive adjacent to it vulcanize, and the waterproof sheets adhere even more firmly to each other, making underwater joint construction extremely safe. In addition, the joints of waterproof sheets coated with rubber adhesive are submerged in water in the same way as above, and then the joints of the waterproof sheets are overlapped by a diving worker, and the lap part is compacted by a compaction roll. be done.

(Example) The rubber compound shown in Table 1 was manufactured in a factory with a thickness of 1.0~
A naturally vulcanized adhesive tape having a diameter of 1.5 mm, a width of 100 mm, and a Mooney viscosity of 5 was formed, and after the tape was formed, it was stored at 25° C. for 2 days and then brought to the bonding site.

This adhesive tape was attached to the edge (200 mm) of a vulcanized rubber sheet made of a blend of EPT and IIR.
Release paper was attached. On the other hand, Neo Bond #110 was applied to the edge (200 mm) of a vulcanized rubber sheet having the same composition as above.
A butyl rubber adhesive from JS (manufactured by Sanso Belting Co., Ltd.) was applied.

Next, the above two waterproof sheets were heated at 15-17°C and 40-40°C.
Submerge the waterproof sheet in water to a depth of 50 cm, overlap the ends of the waterproof sheet, and remove the release paper at the same time.
5 kg/cm). After bonding, they were taken out of the water and subjected to a peel test. Further, after applying Neo Bond #110J to each end of the waterproof sheet, they were bonded underwater under exactly the same conditions as above. The test piece for the peel test was made by punching out the bonded waterproof sheet into 1 x 6 S pieces, and then heating the test piece at 25 to 25°C for 50 minutes.
A T-peel test was performed at a speed of 0 mm/min. The results are shown in Table 2.

below below remaining white Both cases are cohesive failures of adhesive tapes or adhesives.

(Effects of the Invention) As described above, according to the underwater joint construction method of the present invention, a rubber adhesive having a water effect and a self-rejuvenating effect is applied to the edge of one waterproof sheet, or a natural adhesive having the same characteristics is applied. A sulfurable adhesive tape is attached, and a rubber adhesive is applied to the end of the other waterproof sheet, and the waterproof sheets are joined in an underwater environment. As the adhesive hardens, the adhesive strength between the tarpaulin sheets increases, so there is no need to use physical fixing means, and even if adhesive tape is used, it only needs to be attached to one end of the tarpaulin sheet. Therefore, it is possible to perform rolling by peeling off only one side of the release paper, which greatly improves workability, and has the effect of allowing easy underwater jointing.

[Brief explanation of drawings]

The figure is a vertical cross-sectional view of an underwater waterproof sheet joint structure in which the underwater joint construction method of the present invention is implemented. (3) - Adhesive tape (41 (6) - Waterproof sheet (
51-Rubber Adhesive Patent Applicant Sanso Hoshi Held Co., Ltd. Procedural Amendment (Method) % Formula % 1. Indication of the case 1985 Patent Application No. 221637 2. Name of the invention Method for underwater jointing of waterproof sheet 3. Relationship with the case of the person making the amendment Patent applicant address 4-1-21 Hamazoe-dori, Nagata-ku, Kobe ) In the 18th line of page 14 of the specification, "Figure wa" is amended to "Figure 1 is". (2) Amend the attached drawings as per the attached sheet. 7. List of attached documents (11 drawings, 1 copy)

Claims (1)

[Claims] 1. In the air, one end of the waterproof sheet contains a rubbery polymer made of butyl rubber, ethylene-propylene-terpolymer, or a blend thereof, which has low water absorption in the air, and contains a vulcanizing agent and a vulcanization accelerator. Apply a rubber adhesive and then apply the above rubber adhesive to the end of the other waterproof sheet, or use ethylene-propylene-terpolymer, butyl rubber, or a blend thereof, which has low water absorption in the air. After pasting a self-adhesive, naturally vulcanizing adhesive tape containing a vulcanizing agent and a vulcanization accelerator to a rubbery polymer, both of the above waterproof sheets are submerged in water, and the ends of the above waterproof sheets are submerged in water. A waterproof sheet underwater joining method characterized by joining lap parts by rolling the parts overlappingly.