JPH1129762A - Water stopping composition for grout hole and water stopping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water stopping compsn. for a grout hole which can effectively prevent water leakage of underground water in a grout hole and, in addition, when applied to a grout hole cap, can facilitate the detachment of the cap. SOLUTION: This water stopping compsn. comprises: (A) a base oil, such as a mineral oil, a synthetic lubricating oil, or an animal or vegetable oil; (B) a metal soap or nonsoap thickener; (C) a high-mol.wt. polyolefin or vinyl acetate having a kinematic viscosity of not less than 8000 mm<2> /s at 40 deg.C, such as polybutene; and (D) a highly water absorptive polymer having a water absorption capacity of 10 to 1,000 g of water/g, wherein the amt. of the highly water absorptive polymer (D) incorporated is regulated to 1 to 50 wt.% to hold the adhesion, the coefficient of water absorption expansion is regulated to 20 to 500%, and the consistency is regulated to 120 to 400 (25 deg.C, JIS K 2220 5.3).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grout hole water-stopping composition for preventing leakage of groundwater in a grout hole (backing injection hole) drilled in a segment in the construction of a tunnel, and a water stopping method therefor. It is.

[0002]

2. Description of the Related Art In a shield construction method in tunnel construction, in order to fill a gap between a segment and a ground, and to prevent loosening and leakage of surrounding ground, a segment is assembled after an excavator, and then a grout is formed. Mortar or the like is injected from the hole (injection hole) to the outer periphery of the segment (backfill injection), and after the backfill injection, the grout hole is generally closed with a grout hole cap via rubber packing to prevent spouting of groundwater. It was a target.

[0003]

However, since the water pressure applied to the groundwater is extremely high in some places, even if the grout hole cap is mounted via the rubber packing, the groundwater leaks from a slight gap between the grout hole inner wall and the cap. There was something to do.

[0004] In addition, delays in backfill injection and shortage of injecting agent cause ground collapse accidents and water leakage during initial excavation. Therefore, each backfill injection (primary injection) is performed as soon as possible after the first backfill injection. It is considered preferable to perform the secondary injection so that the injection agent is uniformly filled by examining the filling rate near the injection hole. In addition, since the arrangement position of the segment may be changed several times, the grout is increased. The hole cap had to be easily attached and detached, and the water could not be stopped by hardening the grout hole and the grout hole cap with resin.

[0005] Further, groundwater is strongly acidic or strongly alkaline depending on the location, and thus a water-stopping composition having a wide range of strong acidity to strong alkalinity is required.

Accordingly, the present invention has been made in view of the above-mentioned problems, and therefore, it is possible to reliably prevent groundwater from leaking in a grout hole, and yet to easily hold a grout hole cap by detaching it. It is an object of the present invention to provide a water blocking composition for grout holes having a wide range of resistance and a water stopping method therefor.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the water-stopping composition for grout holes according to the present invention comprises a base oil (A) such as a mineral oil, a synthetic lubricating oil, an animal or vegetable oil, a metal soap or a non-soap. System thickener (B), kinematic viscosity 8000 at 40 ° C
(Mm ² / s) or more high molecular weight polyolefin or vinyl acetate (C), and water absorption capacity 10 to 1000 (water g / g)
A composition comprising the superabsorbent polymer (D), wherein the blending amount of the superabsorbent polymer (D) is adjusted to 1 to 50 (% by weight), and the water absorption expansion coefficient is 20 to 500.
(%), Consistency of 120 to 400 (25 ° C, JISK
2220 5.3).

Here, if the amount of the superabsorbent polymer is less than 1% by weight, water leakage may occur. If the amount is more than 50% by weight, not only the amount of other components becomes small, but also the coating becomes difficult, and The adhesion decreases, and the applied water-stopping composition is washed away by water pressure, causing water leakage. If the coefficient of water absorption and expansion is lower than 20%, water leakage may occur, and if it is higher than 500%, the effect of preventing water leakage is not affected. If the consistency is lower than 120, it is difficult to keep the grout hole cap in an easily attachable / detachable state. If the consistency is higher than 400, the adhesive force is reduced, and the applied water-blocking composition flows under water pressure.

The base oil (A) of the present invention includes a refined mineral oil, a silicone oil, a hydrocarbon synthetic oil, an ester synthetic oil,
Glycol synthetic oils, vegetable oils and the like can be used.

The thickener (B) of the present invention may be any of a metal soap type and a non-soap type. Examples of the metal soap include alkali metal soaps, alkaline earth metal soaps, aluminum soaps and the like. Metal soaps and the like can be mentioned, and non-soaps include bentonite, silica gel, polyurea, fluororesin, phthalocyanine, carbon black and the like. In addition, wax can be used, and paraffin wax, polyethylene oxide wax, montaro wax, and bisamide can also be used, but polyurea is used to impart high resistance in a wide range of strong acidity to strong alkalinity. Is preferred.

As the high-molecular-weight polyolefin of the present invention, a high-molecular-weight polyolefin having a kinematic viscosity at 40 ° C. of 8000 (mm ² / s) or more, for example, a high-molecular-weight polyolefin such as polybutene can be used. In addition, an adhesive vinyl resin such as vinyl acetate can be used.

The superabsorbent polymer (D) of the present invention includes, for example, starch-based superabsorbent polymers such as starch-acrylonitrile graft polymer hydrolyzate, starch-acrylic acid graft polymer, cellulose-acrylonitrile graft polymer, cellulose -Cellulose superabsorbent polymer such as styrene sulfonic acid graft copolymer, polysaccharide superabsorbent polymer, protein superabsorbent polymer such as collagen, polyvinyl alcohol superabsorbent polymer such as polyvinyl alcohol crosslinked polymer. -Acrylic superabsorbent polymer such as crosslinked sodium polyacrylate, sodium acrylate-vinyl alcohol copolymer, maleic anhydride superabsorbent polymer, vinylpyrrolidone superabsorbent polymer, polyethylene glycol.
Examples thereof include a polyether-based superabsorbent polymer such as a diacrylate crosslinked polymer, an ester condensation-based superabsorbent polymer, and an amide condensation-based superabsorbent polymer. The water-absorbing ability is preferably from 10 to 1000 (water g / g), and the superabsorbent polymer may be in the form of powder, beads, liquid, gel, fiber, or the like.

It is optional to add a stabilizer, a rust inhibitor, an antioxidant and other additives to the above composition.

Next, the method for stopping water in a grout hole according to the present invention prevents the leakage of groundwater and fills the gap between the grout hole inner wall and the grout hole cap by filling the above-described grout hole water-stopping composition with the grout hole cap. The hole cap is detachably held. For example, as shown in FIG. 1, the above-described grout hole water-stopping composition 5 is applied to the outer peripheral surface of the threaded portion 3 a of the grout hole cap 3, and preferably, cement powder, preferably quick-setting cement, is further applied to the applied surface. After spraying, grout hole cap 3 was drilled in segment 1
Into the gap 4 between the grout hole inner wall 2a and the grout hole cap 3, and the grout hole water-stopping composition 5
Alternatively, a mixture of the cement powder and the cement powder may be filled.

In such a water stopping method, the grout hole water stopping composition 5 absorbs the groundwater infiltrating into the gap 4 sequentially and expands, and the gap 4 is completely closed.
In addition, since the consistency of the composition 5 is adjusted to increase the adhesive force, even in a place where the pressure of the groundwater is considerably high, it is possible to surely prevent water leakage without flowing. Further, if the cement powder is sprayed and mixed, not only the water absorbing ability is further enhanced and the water stopping effect can be further improved, but also the water stopping composition for the grout hole (dotted line portion in the figure) protruding from the gap 4 becomes paste-like. Therefore, falling or dripping can be prevented.

Further, the above-mentioned water-stopping composition for grout hall exhibits the performance as a grease by blending a base oil and a thickener, and furthermore, by adjusting the blending amount and the consistency of the superabsorbent polymer, the cap is improved. The force required at the time of removal has been successfully reduced, and the grout hole cap 2 can be easily attached and detached. Further, when comparing the effect of the water-stopping material for grout hole with the water-stopping material mainly composed of rubber material or epoxy resin, especially when the water-stopping material is used as the water-stopping material of groundwater, the groundwater is strongly acidic depending on the place. Because it is hard or alkaline, corrosion becomes a problem in the case of rubber materials,
In the case of an epoxy resin, curing becomes a problem, whereas the water blocking composition for grout holes of the present invention is particularly excellent in that there is no such problem.

It should be noted that, even if a highly water-absorbing polymer is added to grease, it is generally difficult to imagine that the compound absorbs water and expands the entire grease. The water blocking composition for grout holes has been able to absorb water and swell and has found that this expansion is very effective in stopping water. The present invention is also characterized in that self-regeneration is possible because the absorbed water gradually evaporates and returns to the state before expansion again, and can be used repeatedly.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, Embodiments 1 to 1 according to the present invention will be described.
5 and the results of Examples 1 to 5 were subjected to a water leak test and a cap removal torque test, and the results were compared with Comparative Examples 1 to 3.

(Example 1) A water-stopping composition for grout holes was prepared according to the following formulation. Base oil mineral oil urea grease 70.0% by weight Polybutene 20.0% by weight Highly water-absorbing polymer 10.0% by weight

The kinematic viscosity of the base oil mineral oil in the above formulation is 4
At 0 ° C., 150 mm ² / s, urea grease consistency is 285, immiscible consistency is 282, kinematic viscosity of polybutene is 26,000 (mm ² / s) at 40 ° C., and superabsorbent polymer has a water absorption capacity of 1000. (Deionized water g / g).
The water blocking composition for a grout hole having the above composition had an immiscibility penetration of 243 and a water absorption expansion coefficient of about 100%.

Example 2 A water-stopping composition for a grout hole was prepared according to the following formulation. Mineral oil 70.0% by weight Water-resistant silica 10.0% by weight Polybutene 10.0% by weight Superabsorbent polymer 10.0% by weight

The kinematic viscosity of the mineral oil in the above formulation is 40 ° C.
At 150 mm ² / s and the kinematic viscosity of polybutene is 1 at 40 ° C.
The water absorption capacity of the superabsorbent polymer is 60,000 (mm ² / s) and 1000 (deionized water g / g). The water blocking composition for a grout hole having the above composition had an immiscibility penetration of 298 and a water absorption expansion coefficient of about 100%.

Example 3 A water-stopping composition for grout holes was prepared according to the following formulation. Castor oil 59.5% by weight Lithium soap 8.0% by weight Polybutene 30.0% by weight Low molecular weight polypropylene (molecular weight 7000) 1.0% by weight High water-absorbing polymer 1.5% by weight

The kinematic viscosity of the polybutene in the above formulation is 4
At 0 ° C., 26,000 (mm ² / s), the water absorbing ability of the superabsorbent polymer is 1000 (g / g of deionized water). The water blocking composition for a grout hole having the above composition had an immiscibility penetration of 287 and a water absorption expansion coefficient of about 20%.

Example 4 A water blocking composition for a grout hole was prepared according to the following formulation. S-L synthetic oil ··· 55.0% by weight Benton ··· 12.0% by weight Low molecular weight polypropylene (molecular weight 7000) ··· 5.0% by weight Superabsorbent polymer ··· 30.0% by weight

The kinematic viscosity of the S-L synthetic oil in the above formulation is 132 mm ² / s at 40 ° C., and the water absorbing ability of the superabsorbent polymer is 1000 (deionized water g / g). The water blocking composition for a grout hole having the above composition had an immiscibility penetration of 241 and a water absorption expansion coefficient of about 300%.

Example 5 A water blocking composition for a grout hole was prepared according to the following formulation. Mineral oil 81.0% by weight Lithium soap 4.0% by weight Polybutene 5.0% by weight Superabsorbent polymer 10.0% by weight

The kinematic viscosity of the mineral oil in the above formulation is 40 ° C.
430 mm ² / s and the kinematic viscosity of polybutene is 1 at 40 ° C.
The water absorption capacity of the superabsorbent polymer is 60,000 (mm ² / s) and 1000 (deionized water g / g). The water blocking composition for a grout hole having the above composition had an immiscibility penetration of 388 and a water absorption expansion coefficient of about 100%.

Comparative Example 1 A composition was prepared according to the following formulation. Base oil mineral oil urea grease 54.1% by weight Polybutene 45.0% by weight Superabsorbent polymer 0.9% by weight

The kinematic viscosity of the base oil and mineral oil in the above formulation is 4
430 mm ² / s at 0 ° C., consistency of urea grease is 285, immiscibility is 282, kinematic viscosity of polybutene is 26,000 (mm ² / s) at 40 ° C., and water absorbing ability of superabsorbent polymer is 1000 (Deionized water g / g).
The composition having the above composition had an immiscibility penetration of 357, and a water absorption expansion coefficient of 9%.

Comparative Example 2 A composition was prepared according to the following formulation. Mineral oil 36.0% by weight Lithium soap 5.0% by weight Polybutene 4.0% by weight Superabsorbent polymer 55.0% by weight

The kinematic viscosity of the mineral oil in the above formulation is 40 ° C.
At 150 mm ² / s and the kinematic viscosity of polybutene is 1 at 40 ° C.
The water absorption capacity of the superabsorbent polymer is 60,000 (mm ² / s) and 1000 (deionized water g / g). The composition having the above composition had an immiscibility penetration of 239 and a water absorption expansion coefficient of 550%.

Comparative Example 3 A composition was prepared according to the following formulation. Mineral oil 22.5% by weight Lithium soap 2.5% by weight Polybutene 25.0% by weight Superabsorbent polymer 50.0% by weight

The kinematic viscosity of the mineral oil in the above formulation is 40 ° C.
At 150 mm ² / s and the kinematic viscosity of polybutene is 1 at 40 ° C.
The water absorption capacity of the superabsorbent polymer is 60,000 (mm ² / s) and 1000 (deionized water g / g). The composition having the above composition had an immiscible penetration rate of 160 and a water absorption expansion coefficient of 500%.

(Water Leak Test and Cap Removal Torque Test) The above Examples 1 to 5 and Comparative Examples 1 to 3 were used as samples.
The following water leak test and cap removal torque test were performed.

As shown in FIG. 2, the water leakage test was performed using a cylinder 10 having a cap receiving hole 11 at the bottom and an air injection part 12 at the top. Each sample is previously applied to the threaded portion of the cap 13 having substantially the same shape as the grout hole cap, and 500 ml of deionized water is placed in the cylinder 10 with the cylinder 10 shown in FIG.
Then, the cap 13 was screwed into the cap receiving hole 11 and tightened with a torque wrench. The torque at that time is 30
kg / cm ² (2.94 MPa). Next, the cylinder 10 was turned upside down (as shown in FIG. 2), and air was injected into the cylinder 10 through the air injection part 12 to set the internal pressure to 5 kg / cm ² . Then, the cap 13 was left to stand for 10 days, and the lower surface of the cap 13 was observed. If the water bleeding or water leakage was observed, the result was x.
And the results are shown in Table 1 below.

In the cap removal torque test, the maximum torque when the cap was loosened with a torque wrench after the water leakage test was measured, and this value is shown in Table 1 below.

[0038]

[Table 1]

As a result, in Examples 1 to 5, no water leakage occurred, and the cap removal torque was lower than those of Comparative Examples 1 to 3. On the other hand, in Comparative Examples 1 and 2, water leakage was observed, and the cap removing torque of Comparative Example 3 was an extremely large value. In Comparative Example 2, water leakage was observed despite the high water absorption expansion coefficient of 550%.
%, The adhesion was reduced due to a decrease in the blending ratio of other components, particularly polybutene, and it is considered that the sample was washed away by water pressure. Comparative Example 3
The reason is considered to be that the mixing ratio of polybutene and the superabsorbent polymer was too large, so that the lubricity as grease was lowered and the cap removal torque became extremely large.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a use state of a water blocking composition for grout holes of the present invention.

FIG. 2 is a cross-sectional view illustrating test states of a water leak test and a cap removal torque test.

[Explanatory explanation of reference numerals]

 DESCRIPTION OF SYMBOLS 1 segment 2 grout hole 3 grout hole cap 4 gap 5 water stop composition for grout hole 10 cylinder 11 cap receiving hole 12 air injection part 13 cap

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuka Okamoto 1-9-4 Nihonbashi Honcho, Chuo-ku, Tokyo In the Nichimori Division of Osaka Shipyard Co., Ltd. (72) Inventor Hiroyuki Takeuchi 14-4 Nihonbashi Kobunacho, Chuo-ku, Tokyo No. Nishiki Shoji Co., Ltd.

Claims (3)

[Claims] 1. A base oil (A) such as a mineral oil, a synthetic lubricating oil or an animal or vegetable oil, a metal soap-based or non-soap-based thickener (B), and a kinematic viscosity of 8000 (mm ² / s) or more at 40 ° C. A composition comprising a high-molecular-weight polyolefin or vinyl acetate (C) and a superabsorbent polymer (D) having a water absorption capacity of 10 to 1000 (water g / g), and a blending amount of the superabsorbent polymer (D). 1 to 50 (% by weight)
And the coefficient of water absorption and expansion is 20 to 500 (%) and the consistency is 120 to 400 (25 ° C, JIS K2220 5.3)
A water-stopping composition for grout holes prepared as follows. 2. A base oil (A) such as a mineral oil, a synthetic lubricating oil, or an animal or vegetable oil, a metal soap-based or non-soap-based thickener (B), and a kinematic viscosity of 8000 (mm ² / s) or more at 40 ° C. A composition comprising a high-molecular-weight polyolefin or vinyl acetate (C) and a superabsorbent polymer (D) having a water absorption capacity of 10 to 1000 (water g / g), and the blending amount of the superabsorbent polymer (D) Is adjusted to 1 to 50 (% by weight), the coefficient of water absorption and expansion is 20 to 500 (%), and the consistency is 120 to 50%.
Filling the gap between the grout hole inner wall and the grout hole cap with the grout hole water-stopping composition prepared at 400 (25 ° C., JIS K2220 5.3) prevents the leakage of groundwater and attaches and detaches the grout hole cap. A method for stopping water in a grout hole, wherein the grout hole is held as possible. 3. A base oil (A) such as a mineral oil, a synthetic lubricating oil, or an animal or vegetable oil, a metal soap-based or non-soap-based thickener (B), having a kinematic viscosity of 8000 (mm ² / s) or more at 40 ° C. A composition comprising a high-molecular-weight polyolefin or vinyl acetate (C) and a superabsorbent polymer (D) having a water absorption capacity of 10 to 1000 (water g / g), and the blending amount of the superabsorbent polymer (D) Is adjusted to 1 to 50 (% by weight), the coefficient of water absorption and expansion is 20 to 500 (%), and the consistency is 120 to 50%.
Filling the gap between the grout hole inner wall and the grout hole cap with a mixture of the grout hole water-stopping composition prepared at 400 (25 ° C., JIS K2220 5.3) and cement powder reduces the leakage of groundwater. A method for stopping water in a grout hole, wherein the grout hole cap is detachably held.