JPH0633697A - Void filling method for tunnels, etc. - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a method for filling voids in a tunnel or the like, which enhances the water blocking effect of the voids in the tunnel or the like by a filler, improves workability and economic efficiency, and further prevents groundwater pollution. The purpose is to provide. According to the present invention, in a method of filling a gap between a tunnel or an underground structure or the like and a surrounding ground with a filler, a liquid T containing a polyisocyanate as a main component and a liquid R containing a polyol as a main component are used. A method for filling voids such as tunnels, characterized in that the liquids are mixed at a volume ratio of T liquid 2 and R liquid 1 and injected into the voids, and the mixture is foamed and cured to fill the voids.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling a gap between a tunnel or an underground structure and the surrounding ground with a filler.

[0002]

For filling voids such as tunnels and underground structures, conventionally, a mortar filling method, a bentonite mortar method, an air mortar method, an expansive material-containing mortar method and the like have been carried out. However, these construction methods have the following problems, especially when water is present in the voids. The cement paste is not completely filled due to the presence of water and the water blocking effect is reduced. Since the cement paste is dissolved in water, it cannot be solidified rapidly, and the workability and water blocking performance are deteriorated. Changes in shrinkage occur and voids remain. Since the melted cement paste diffuses through minute voids such as cracks in the ground, the filling amount becomes extremely large,
It is uneconomical. Cement paste diffused through minute voids causes groundwater pollution. Since the volume of materials such as cement, water, bentonite, expansive material, and foaming agent itself is large, the entire construction apparatus becomes large and the workability in a narrow space such as in a tunnel is deteriorated.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and enhances the water blocking effect of voids such as tunnels due to the filling material, and improves workability and economy. It is an object of the present invention to provide a void filling method for a tunnel or the like that can improve and further prevent groundwater pollution.

That is, according to the present invention, in a method for filling a void between a tunnel or an underground structure or the like and surrounding ground with a filler, a T liquid containing polyisocyanate as a main component and a polyol as a main component. 2 liquid of R liquid to be used, T liquid 2 in the volume ratio,
A void filling method for a tunnel or the like, characterized in that the liquid R is mixed in a ratio of 1 and injected into the void, foamed and cured to fill the void. Further, in the above method, the material ratio of T liquid is polyisocyanate 59 to 65, flame retardant 5
And the material ratio of the R liquid is polyols 16 to 22,
It is a method of filling voids such as tunnels using crosslinking agents 2 to 4, foam stabilizer 1, catalysts 1 to 3, and foaming agents 4 to 6.

FIG. 1 shows a comparative list of the present invention constructed as above and the prior art. As is clear from this figure, the present invention is excellent in all items such as water-stopping property, quick-setting property, filling property, maneuverability, rapid construction (evaluation is relative comparison with the present invention). This indicates that only the present invention can be applied to constructions that require immediate filling in voids with water. Note that FIG. 2 shows an example of the relationship between the elapsed time and the compressive strength in comparison with other construction methods, and FIG.
Shows the result of the confirmation test of filling property. The conditions for comparison with each construction method are as follows. The height of the void is about 10 to 50 cm. There are fine voids in rock and soil. There is water such as groundwater. Construction that requires immediate access to traffic above the existing road tunnel.

[0006]

EXAMPLES The filling material of the present invention is a rigid polyurethane foam composed of T liquid and R liquid. When the compounding amount is represented by 100, the liquid T is polyisocyanate 59 to 65, flame retardant 5
~ 11. The R liquid is a polyol 16 to 22, a cross-linking agent 2 to
4, a foam stabilizer 1, catalysts 1 to 3, and foaming agents 4 to 6. The two liquids are mixed in a volume ratio of T: R of 2: 1. Then, the cream time (starting foaming) is 10 ± 5
Seconds, at least 20 seconds, and the rise time (end of foaming) is 60 ± 10 seconds, at least 120 seconds, and the final strength is obtained in about 30 minutes (cream time 20 seconds or more, rise time 120 seconds. Above, the strength decreases by reacting with water in the ground). The final strength changes by changing the expansion ratio, and the compression strength is 1 to 12k.
A range of gf / cm ² is obtained. Foaming ratio is 15-3
0 times is often used. No dissolution in water during and after foaming. If the volume ratio of the T liquid and the R liquid is not set to 2: 1, the predetermined expansion ratio and strength cannot be obtained. FIG. 4 shows an example of the experiment. As is clear from this figure, the ratio of the T liquid and the R liquid influences the performance after foaming. The NCO index is 1.7 or more, and the mixing ratio is T: R = 2.0 to 2.5 / 1 (normal). If it is less than this, the strength of the ground will decrease due to the water in the ground, causing abnormal heat generation.

[0007]

[Construction method] As shown in FIG. 5, both liquids are drawn out from tanks 1 and 2 for R liquid and T liquid by a pump 3 via a motor, and an air hose 4 is taken in at the tip portion to make one.
Finally, the injection hose 5 is used to inject into the gap 8 between the tunnel 6 and the ground 7. Note that FIG. 6 shows an example of a standard mechanical device flow used for the above construction. The material tank, injection pump (motor), injection nozzle, injection hose, pressure gauge, flow meter, etc., and all the materials and machinery / equipment necessary for the construction can be loaded on a mobile carrier. Moreover, a 4 ton flat body is sufficient for the loading vehicle. Therefore, the construction method of the present invention enables a large amount of rapid construction with compact equipment so that it can exhibit mobility and can be used at any time. Further, since the work is unified, no special skill worker is required.

[0008]

Since the present invention is as described above, the following effects can be obtained. INDUSTRIAL APPLICABILITY The present invention can be expected to have the following effects particularly when it is installed in voids such as tunnels and underground structures containing water. <A> Curing time is about 1 minute, time to reach the final strength is about 3
It is very quick as 0 minutes, so it is suitable for rapid construction. recent years,
If there is a void at the top of the existing road tunnel, it is often necessary to stop the traffic at night and quickly construct it to fill the void and release the traffic early in the morning. In such a place, the present invention is most suitable, and when early strength is required and water is particularly present in the voids, it cannot be completely filled by another construction method without the present invention.

<B> Since there is no diffusion and infiltration into the natural ground (rock, soil) and there is almost no loss of material, economical construction is possible.

<C> Water can be reliably stopped without being dissolved in water during and after construction.

<D> No volume change such as expansion and contraction occurs after construction.

<E> No harmful gas is generated during construction, and there is no water pollution after construction.

<F> Since the entire apparatus can be downsized and has mobility, it can be immediately handled and constructed.

<G> Since the work is unified, no special worker is required.

<H> The work time is short, mass construction is possible, and the number of workers is small.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a comparison between the present invention and a conventional method.

FIG. 2 is an explanatory diagram showing the relationship between elapsed time and compressive strength.

FIG. 3 is an explanatory diagram showing results of a filling property confirmation test.

FIG. 4 is an explanatory diagram showing an example of the ratio of T liquid and R liquid and the performance after foaming.

FIG. 5 is an explanatory diagram showing an example of a standard construction procedure.

FIG. 6 is an explanatory diagram showing an example of a standard mechanical device flow.

[Summary] Summary

[Specification]

An object of the present invention is to provide a void filling method for a tunnel or the like, which enhances the water blocking effect of the void or the like by a filling material, improves workability and economic efficiency, and can prevent groundwater pollution. To do.

According to the present invention, in a method of filling a gap between a tunnel or an underground structure or the like and surrounding ground with a filler, a T liquid containing polyisocyanate as a main component and an R liquid containing polyol as a main component. A method for filling voids such as tunnels, characterized in that two liquids are mixed at a volume ratio of T liquid 2 and R liquid 1 and injected into the voids, followed by foaming and curing to fill the voids. Is.

[Selection diagram]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sada Nakano 2-4-2 Kitahakuji-cho, Chuo-ku, Osaka City Nisshin Spinning Co., Ltd. Osaka Branch Office (72) Inventor Hideo Senke 1-18 Nishiarai-cho, Adachi-ku, Tokyo -1 Inside Nisshin Spinning Co., Ltd. Nishiarai Kasei Plant

Claims (2)

[Claims] 1. A method of filling a filler in a void between a tunnel or an underground structure or the like and surrounding ground, comprising a T liquid containing polyisocyanate as a main component and an R liquid containing polyol as a main component. A method for filling voids such as tunnels, characterized in that the two liquids are mixed at a volume ratio of T liquid 2 and R liquid 1 and injected into the voids, and then foamed and cured to fill the voids. 2. The material ratio of the T liquid is polyisocyanate 5
9 to 65, flame retardant 5 to 11, and the material ratio of the R liquid is polyol 16 to 22, crosslinking agent 2 to 4, foam stabilizer 1, catalyst 1 to 1.
3. The method for filling voids in a tunnel or the like according to claim 1, wherein the foaming agent is 4 to 6.