JPS5949281A - Grouting material and grouting process - Google Patents

Abstract

PURPOSE:To provide a grouting material having short gel time and high initial strength using only a small amount of water glass, by mixing a cement suspension with an aqueous solution of water glass at a specific ratio. CONSTITUTION:The objective grouting material is composed of (A) a suspension composed mainly of cement and (B) an aqueous solution of water glass having a water glass concentration of >=20wt% in terms of SiO2, wherein the amount of SiO2 in the component (B) is 3-9g per 100cc of the liquid in the components (A) and (B). It is preferable to add gypsum or lime to the component (A) to obtain a flash-setting grouting material having a gel time of <=20sec. Preferably, the components (A) and (B) are pumped with respective pumps having different rate of discharge, mixed with each other at the tip of the grouting pipe, etc., and impregnated and filled in the ground or impregnated into the ground after mixing with the soil in the ground. USE:Promoting the cut-off property of weak ground and the shuttered zone of base rock, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grout material for the purpose of water stoppage or ground reinforcement in soft ground or fractured zones of rock, and an injection method using the grout material. Medicines that are generally based on water glass? There are two types of f&: solution type and suspension type. Used for injection targeting the interface between the structure and the ground. The present invention is a suspension type layer.

Unlike solution-type grout, suspension-type grout is injected into clay soil in a vein-like manner, or by injection into relatively large gaps or filling voids, or by stirring and mixing with water in the ground, and usually does not solidify. A strong 11-ment thread is placed on top for 1 minute (, -u color.

rjl is the most commonly used in this -1-ment system.
: ■1W is a combination of 7 laths of mento and water, and usually the water glass liquid and the cement R-water liquid are combined separately in W/■,
Kasanuizutsukawa i:A using two pumps 1. , ,t
I: Both liquids are combined between the inlet pump and the tip of the injection pipe and injected into the nitrogen gap across the ground to form a slag.

In this LWI method, J contained in the cement suspension is
], By changing the cement material, dull tights and
to train. However, since both liquids are mixed at the same temperature, no matter how many cements are used, C is also dull tight, and unless the time is shorter than around 1130 seconds, the initial strength development will be slow at 11ψ. There is a drawback.

In general, cement-based injection 4'A is often required to have a short injection period and a large initial strength due to the construction purpose, injection method, etc. Moreover, there are cases where a short ripple time and a high early strength are required separately, and there are some stations where both are required.

It is an object of the present invention to provide a grout material that overcomes the above-mentioned drawbacks of LW, shortens the refill time, and exhibits excellent initial strength.

According to the present invention, a suspension containing Hymento as a main component? '1ii
il night (A solution) and water glass aqueous solution (B 7+"li)
In order to mix and inject A'l+I and B liquid, the added water is ff1ii to suppress dull time while suppressing glass vomit to a small amount <
It is possible to obtain a grout material that can increase L and initial strength.

Also, dull tights are extremely short, e.g.
In seconds? If you wish to increase the strength in the η period, use liquid B (
11. Add gypsum (hanmizu gypsum or sanmizu gypsum) or lime (slaked lime) to 11 and 11.

In the case of the conventional LW construction method, in which equal amounts of water glass and cement suspension layer are mixed and injected, as long as the amount of cement is constant, the amount of water glass and cement suspension layer is high.
However, the time required for treatment is not shortened in proportion to the increase in water glass concentration, and there is a certain limit to the shortest possible time, and there are no chemicals that have a time shorter than around 30 seconds. As mentioned above, on the contrary,
When the water glass concentration is lower than a certain value (Sio++ in the water glass liquid)
7* The degree is lowered to 1.2 degrees - less than 1.2 degrees, and the station building has an A.
B: After the two liquids are mixed, the drug solution is delayed for a long time, and finally becomes a drug solution that does not completely dissolve into one liquid, making it useless for injection (7 minutes).

1'/ζ, Inoi'4 ('), WJ method small.

The components of the 1-ment and water glass used to improve the drawbacks of the LW construction method of the present invention 1ζe, -I-:
11 "j, lJ'l-I have been doing a lot of research on other points. What!1
(1) When cement suspension and water glass liquid are mixed in grade (conventional LW soil method), -. Water glass in the water glass liquid to be blended (still 51
Even if the concentration of o2) is increased, the cell time V' hardly changes.

(2) The water glass concentration is below a certain amount F, that is, the 5i02 concentration contained in the chemical solution (grout) after mixing the An painting solution is approximately 1
．． When 2Xtff exceeds 1%, no caking phenomenon occurs.

(3) Surprisingly, even if the amount of water glass (St 02 ) relative to the total amount of grout is the same, A
B The dull time and initial strength development of the chemical solution after mixing the two solutions are significantly different.

In other words, when the total amount of water glass in a chemical solution is a constant value, a water glass solution with a high concentration When using a small amount of
The expression of le is remarkable /'-1,.

(4) Putting it into the 1-ment suspension (71 + 7. (approx. 10 seconds, 1 unit))
1f1 of water glass to be converted into 5iOz is 3~9
In the allocation 1+1ij 1III) which is g, there is a small amount of water glass liquid mixed into I:L and gluta.
Ino,) 1. i: together with the short Z), it shows a tendency to become a first person.

Book 9. At dawn, we have studied in detail the unique properties mentioned in 11 [1] above, and have determined that this unique property can be used to double-layer the actual chemical solution, and we have completed the 1st article of the 7th patent claim. nit
The described invention has been completed.

That is, according to the present invention, a /L human medicinal solution A is prepared by using a water glass solution (liquid A) containing 8102 at least 20 times a day and combining this with a Hyment suspension (liquid B). When adjusting the grout or adjusting the A and B solutions,
By proportionally mixing the pronation ratio, it is possible to create a grout with a suitable glue time (approximately 10 seconds to approximately 30 seconds) for practical use and a high rising strength. 5
If the ratio (in the range of 3 g or less) is further reduced, the gluing time ti becomes even shorter (10 seconds or less), but the early strength decreases.

Because of this, short-term guru time is eliminated, but ti
Since the expression of J-phase strength cannot be expected, this invention is excluded from the present invention 1:kl group.

On the other hand, in order to eliminate the drawback that the above-mentioned glutaino is shortened but the early strength development is poor, the present inventor has developed cement suspension of liquid B '91i1 VC gypsum (hemihydrate or trihydrate gypsum) or lime ( We investigated adding slaked lime to shorten gluing time and allowing dogs to develop early strength.
C/ko.

That is, using a suspension of cement, gypsum, or lime as AM, 8102% of -C20
A liquid containing MM'% or more of water glass is used as liquid 13, and 8102 stitches in liquid B (including A) are responsible for 1.
By mixing the AB liquid at a ratio of 3 to 91 to 00 cc, the synergistic effect of the An liquid and the synergistic effect of the An liquid can be combined to achieve an instant setting time of 20 seconds or less, and the expression of strong IW in the early stage of VC. 'J' + 'r & VC type wood material is proposed.

As the cement suspension used in the present invention,
Suspension tit Motoyoshi with only menting, regular grout +
Additives that may be added to 4, such as granulated slag,
It is possible to use clay minerals such as flyanite and bentonite, primary minerals such as finely powdered limestone and rocks, excavated soil and sand collected in the present day, and additives such as Ill's expanded material as appropriate.

A lifting platform for use at a grouting site according to the present invention,
In order to mix 1□1 of liquid A and 7ffl of B of 11↓, a proportional 1.5 shot method is used instead of the usual equivalence formula], 5 shot method.

Injection d′ to use? The pump is injected using a proportional pump (a pump made to have different discharge capacities of AB liquid) or two pumps with different discharge capacities.

Furthermore, the method of the present invention has the advantage that the amount of cement suspension in Solution A is larger than the water glass aqueous solution in Solution B, making on-site mixing easier.

In other words, in proportional mixing of 1 part of the grout (liquid A + B), the proportion of part A is larger than in the conventional mixing of equal parts, so it is possible to use 1 part of cement, and still other Aggregate etc. can also be mixed.

Cement that can be used as grout W/C ratio (W
The smaller the W/C ratio (mixed in equal amounts), the faster the hydration reaction of cement, the faster the viscosity of the liquid, and the more difficult it is to pump.

However, construction method 1 of the present invention, when the t W/C ratio is large, on-site construction becomes easy.

The purpose of using the grout material of the present invention is mainly for vein press-in into clayey soil (silt, clay) of soft ground, humus soil cap, and into regular bed with relatively many gaps such as sandy soil layer. l-1:, people, crushing on hard ground such as bedrock 41'7, workers on cranks, boundaries between structures and other boards) 11. Homophone object binding method ζ,
For example, do you need a drip 2' for city water or ground reinforcement in areas such as 111 where there is a lot of spring water in backfilling? There is T.

＋, using ultra-high-pressure jet energy [Jφ in the soil method, the soil in the 11 study board and the present invention (1)
Stir 1 material of Gujiu (even in the combined station, it will give off a Mii-like effect.

f71', next time), motor 1. :Mixed tma, Jl1
Soil and grout in the second board (( をij;j, ('r rl
? +r? "j including e; L, seven to mixture 1-...
When it's time V(, Jim, be r4 first 1iIJ intensity light")
Ji is σ1! It will be extended, but the unknown G rigura 1, 7 tori 4.
By combining Kabura iIE +1'l, Hoqiang L + cl
It is possible to significantly reduce the amount of money required.

However, C1 the method according to the present invention (rM in which gypsum or lime is added to the 1-ment suspension or it 1-ment)
! It is a turbid liquid, and the A solution and the water glass dissolve in water B'KI.
Using L, the concentration of water in liquid B is set to 20% by weight or more based on 3jOz, and 5iOz:Fil is the volume occupied by Maki in the mixture of both liquids AB (3 to 9g for 10cc).
Using two bonfu units with different discharge volumes, pressure feed the AB liquid, which was stored separately, at a ratio such that Mix I-1 This is an injection method characterized by injecting the liquid into the ground, filling it, or stirring and mixing it with the soil in the ground.

EXAMPLES The present invention will be described in more detail below with reference to Examples and Comparative Examples.

Water glass i;t J I S3 used in the following examples
(Si20: 28-30%, Na2O: 9-10
h) 5i02 contained in the water glass stock solution ll
is approximately 400g.

The cement was commercially available Portland cement, the gypsum was industrial hemihydrate gypsum, and the lime was industrial slaked lime.

A water glass solution used in Examples and Comparative Examples was prepared by diluting the water glass stock solution with water.
Water Glass II 8 (10200320 Ogarasu 1
11 700 300 280 Table 2e Si in grout when proportionally mixed according to the method of the present invention
Oz tt4. Table 3 shows the initial strength development state of the variation in the ``response to change'' time. A conventional method of mixing equal amounts is also shown for reference.

Table 2 (Liquid temperature: 22-23°C) Table 3 (i', C) Strong 1.1: I-Noill constant J l5
-R5201'7) Strengthen n', Ek62 method (■ji, 4
The test was carried out using a 33't sill frame measuring 4 x 16 cm.

,'1〆'''- 1togu12-------------□-----As is clear from the results in Table 2, liquids A and B are mixed again Conventional LW construction method (Tone, water glass f-1-1 Comparative example-1
The standard is 501 per 200 ee of grout).

Dull tights, 47 seconds, and water glass, although not shown in the comparative example. Even if the number of leaves is reduced, the dull time is within the range of around 40 seconds, and there is almost no change due to the water glass concentration. Moreover, the initial strength is also very weak.

As you can see from Comparative Example 1 and Comparative Example 2 in Table 2, 1
Even if the amount of water glass is rlrJ, if there are few water rats, the guru time will be shortened. In addition, Examples 1 to 4 and Comparative Example 3
As shown in , the smaller the amount of water glass, the shorter the glue time.

On the other hand, as shown in Examples 1 to 5 in Table 3, the smaller the amount of water glass, the greater the initial strength development. That is,
When water gasis is mixed proportionately into a suspension containing cement, water gas [the initial strength is the highest when L is about 3 to 1 oz.]
If you reduce J/, it will be the first) υJ"IiCノ+7?; S, Hj small size. Reverse K % 5iOz Superposition power 3,9:
(The time is shortened by 1, but the IM of strong fB'' in the Pθ period is 7Σ shorter (see Comparative Example 5 in 11).

By adding gypsum to the 45-ment Umaku 11k, the gel time is increased to 2 () seconds μF and the grout material with high initial strength is applied to the grout material. However, the examples and comparative examples are
and &-5.

// Z,---------,,,------～-～----11-Table-5 As Table-4 also shows, in the construction method of the present invention using proportional mixing, the conventional When compared with the mixed filter method, the gel time can be significantly shortened even when using the cement and gelation accelerator gypsum or lime. In addition, as shown in Table 5, as shown in 4, the method of the present invention-1 has a difference between the conventional construction method and 11 houses l [v L -C, ? The development of sword stage strength is remarkable.

As described above, the grout according to the present invention has excellent properties suitable for water stopping, ground reinforcement, and nitrogen filling in soft ground and fractured zones.

Claims (3)

[Claims] (1) A grouting material used for strengthening municipal water in soft ground or fracture zones in rocks, consisting of Liquid A, which is a cement suspension, and Liquid B, which is a water glass solution. 714'
+ Uniting Jin and Gunutori with 4 characteristics. (2) A1 to A 7+1? Add one lime to the '-9 stop and adjust the total 20 seconds to the total for all features and J/+, 1't'r claim iii+i 17+1
No.(,1) JJ(l'(description(7) Clarato 4
J. (3) +! Mento P: (Consists of solution A, which is a suspension of 13 dissipated or hymento with gypsum j and An injection method characterized by mixing AR liquid at a ratio of 1 to 3 to 9 grams, injecting it under pressure, and stirring and mixing it with soil in the filling ground.