JPS63117612A - Duct bulkhead against water penetration - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a pipe that can effectively watertight the gap between the pipe and the wire for a long period of time at the mouth of the pipe in a manhole in which wires such as communication cables are installed. Regarding road water stop devices.

(Prior art) Conventionally, in a manhole in which a wire such as a communication cable, for example, is installed, conduits are provided on opposing walls, and the wire is routed from one conduit opening to the other conduit opening so as to cross the manhole. It is arranged to extend to. The pipe entrance mentioned above is the end of a concrete pipe formed underground, and if water that has entered the pipe flows out from here, the inside of the manhole will be flooded, but there will be no negative impact on the wire etc. .

To prevent such flooding phenomena from occurring.

BACKGROUND ART A pipe water stop device is known in which a gap between a pipe and a wire is filled with one of various water stop sealing materials.

An example of such a device is to place a sealing material in which a base material such as resin foam or QSSM fiber is impregnated with a water-curable urethane prepolymer in the above-mentioned gap, and utilize water leakage existing there. There are known structures in which the foamed material is foamed and cured to provide a water-stopping effect.

(Problem that the invention attempts to solve) However, in conventional water supply systems.

There are the following problems in terms of construction and performance.

First, in the case of multiple construction, it is necessary to adjust the mixing ratio of the base material and prepolymer, and since the prepolymer is liquid, it is difficult to handle during construction.

Furthermore, the prepolymer is toxic, which poses health and safety problems for workers.

On the other hand, in terms of performance, although it has an excellent water-cleaning effect in the early stages of device formation, the 9-foamed and hardened sealing material shrinks once it dries, and when water leaks into it again, it exhibits water-swelling properties. Therefore, there is a problem that the water stop function can no longer be performed.

The present invention was invented in view of the above circumstances, and provides a pipe water stoppage device that does not cause safety and health problems, has excellent workability, and exhibits excellent water stoppage effects over a long period of time. The purpose is to

(Means for Solving the Problems) The present invention provides primary alkylene oxide and secondary alkylene oxide in the gap between the circumferential surface of the 9g line and the outer circumferential surface of the wire inserted into the line II'V1. Water (B) is added to the urethane prepolymer (A) containing terminal isocyanate groups, which is obtained by completely reacting the polyalkylene oxide containing 20 to 60% by weight of primary alkylene oxide in one molecule with the T-machine polyisocyanate. ) in weight ratio A:
Summary of a pipe water stop device ft filled with a sea/L/material made of a soft polyurethane elastic material obtained by mixing B:1:0.3 to 5.

As mentioned above, the sealing material in the present invention is a soft polyurethane elastomer containing all of the primary alkyl oxides of a specific t, and is usually formed into an appropriate shape such as a tape or a hollow cylinder. .

Polyalkylene oxide (PAO), which is a raw material for the sealing material of the present invention, is a random copolymer of primary alkylene oxide and secondary alkylene oxide. Examples of the above-mentioned primary alkylene oxide include ethylene oxide (EO), which has high reactivity with isocyanates and has a hydrophilicity of σ. Examples of secondary alkylene oxides include propylene oxide (PO), which is less reactive with isocyanates and more hydrophobic than primary alkylene oxides. In this case, it is necessary to set the polyalkylene oxide to contain 20 to 60 weight percent of primary alkylene oginide. When the above range is exceeded, the reactivity of the produced prepolymer with water becomes slow, and the cured product becomes insoluble in water and loses its water-swellability. On the other hand, if the prepolymer exceeds the above range, the reactivity with water of the prepolymer becomes faster, but the prepolymer has a high affinity with water, and the cured product tends to be soluble in water, and has no water swelling property.

Therefore, it is necessary to set the content of primary alkylene oxide within the above range.

The polyisocyanates to be reacted with the above-mentioned boriaflexylene oxide are 1. tolylene diisocyanate (TDI), which is used in the production of ordinary polyurethane, and diphenylene diisocyanate (TDI).
Remethane diisocyanate (MDI) and the like are used.

The urethane prepolymer described above may be used alone, but in some cases, it may be used as a catalyst (to adjust the curing rate), a filler (to adjust the reinforcing property), or a plasticizer (to adjust the disassembly of the cured product).
etc., and the expansion ratio can also be arbitrarily selected.

The amount of water (B) to be mixed with the urethane prepolymer (A) is A: 1 (=l: 0.3 to 50) at a weight ratio of 9. This is because the polyurethane produced by the reaction with the urethane prepolymer is a soft solid elastic body with a mechanical strength of 111 degrees a and excellent water swelling properties.Preferable water The mixing ratio is A:B=l:
0.5 to 3, and under these conditions, the polyurethane to be produced is a soft foam, which is formed into a tube or notebook shape, and is attached to the outer peripheral surface of a wire such as a cable in a prescribed tornado, or Alternatively, it is used by making it into a hollow cylinder and fitting it around the wire rod.

There is no concern about toxicity, and it is easy to handle and has excellent casting properties.

In the sealing material of the present invention, inert organic fiber filaments are mixed with isocyanate groups in the resulting soft polyurethane elastomer.

A woven fabric or a non-woven fabric made of the organic IfR fiber can also be integrated into shoes, etc.

(@Akira's effect) Akira Motoyaku's p:f road de-icing device is formed using a sealing material made of a soft elastic material made by mixing a specific amount of water with a specific urethane prepolymer.

There is no need to use urethane prepolymer during construction, so there is no need to worry about safety and health (m-ability), and you can easily enjoy the workability by simply placing it right next to the water stop, and there may be water leaks in areas where water should be stopped. In addition, the sealing material contains a specific amount of monoalkylene oxide, so it has excellent water swelling properties, so even after the sealing material has dried, it will not leak again. It exhibits excellent water-stopping effects over a long period of time, such as exhibiting water-swelling properties when in contact with water.

(Implementation 41A+) Below, nine embodiments of the water stop device of the present invention will be described.

First, the sealing material used in the present invention is prepared as follows.
! Aa will be given.

First, ethylene oxide (EO) and fu.

Robylene oxide (PU) and total polymerization catalyst are randomly copolymerized to synthesize polyalkylene oxide (PAO) with different amounts of EO.

Next, add tolylene diisocyanate (TDI) to this PAO.
) to synthesize a urethane prepolymer containing terminal isocyanate groups. Then, water is mixed with this prepolymer at the same proportion as water, and poured into a mold to form a hollow cylindrical body (
#i! Inner diameter 48mm, outer diameter 8Qmm, length 50tnm) Build. The results are shown in Table 1.

Table-1 Using the sealing material obtained in this way.

Pipe entrance with water leakage in communication cable manhole (
Water was stopped for a pipe with an inner diameter of 75 mmφ and a cable outer diameter of 5Qw*mφ. Table 2 shows the results regarding workability and water-stopping performance.

Regarding water stop performance, initial performance and performance after drying (40℃
x 168 hours drying) was examined to see if it could withstand a water pressure of 24/C4, and those that could not withstand this water pressure by 0.1 were marked as X in the table.

As is clear from Table 2, the water stop device of the rush flow example has no safety and health problems and is excellent in workability.

Moreover, it provides excellent clean water effects over a long period of time.

1. The shape of the sealing material used in the present invention is as follows.

Above Ii! I! In addition to forming the hollow cylindrical body as in the embodiment, it is also possible to form the tape into a tape shape and arrange it in a laminated state on the outer peripheral surface of the wire.

In addition, when the water stop device of the present invention is installed.

The presence of water leakage in the water supply area is not essential, and the sealing material swells when it comes into contact with water leakage after construction, resulting in an excellent water-stopping effect.

Claims (1)

[Claims] Primary alkylene oxide and secondary alkylene oxide are copolymerized in the gap between the circumferential surface of the pipe and the outer peripheral surface of the wire inserted into the pipe, so that primary alkylene oxide is added to the molecule. Water (B) was added to the terminal isocyanate group-containing urethane prepolymer (A) obtained by reacting a polyalkylene oxide containing 20 to 60% by weight of oxide with an organic polyisocyanate in a weight ratio of A:B=1:
A pipe water stop device characterized in that it is filled with a sealing material formed of a soft polyurethane elastic material obtained by mixing at a ratio of 0.3 to 5.