JP2514668B2 - Ground improvement and stabilization briquette body - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ground improvement and stabilization briquette body used in ground improvement and stabilization treatment. In particular, the present invention relates to a ground improvement and stabilizing briquette body which is convenient for use in ground stabilization treatment in which a disintegration aid is added and a disintegration delay agent is added, and which can prevent dust generation.

[Conventional Technology] Conventionally, cement, quicklime (Chemicolime method: Onoda Cement Co., Ltd. method), Toughlock (registered trademark: Sumitomo Cement Co., Ltd.) as a ground stabilizer and soil stabilizer, a mixture of cement, gypsum and slag. The same applies hereinafter) and other powders were used.

When using these powders, it is necessary to spray the powders evenly over the target soil during construction. For example, the paper bag container in which the powders are stored is destroyed and the powders are discharged, or a lorry car or Although the powder is discharged from the flexible container, a large amount of dust is generated at that time, and when the powder is sprayed, it is scattered by the wind after spraying, or it is generated when the sprayed powder and soil are mixed. It was difficult to avoid dust. There is also a problem that the dust generated in large quantities adheres to agricultural crops, laundry, automobiles, etc. around the construction site to cause damage.

[Problems to be Solved by the Invention] In order to solve the above technical problems, a technology for agglomerating the powder of the ground stabilization agent has been already developed. Although the ground stabilization agent can prevent dust generation, it has a problem that it is difficult to uniformly mix it in the ground because it does not disintegrate in the ground, that is, pulverize quickly. Further, when a powdery ground improving and stabilizing agent is used, since a large amount of dust is generated, it is necessary to adjust the amount of spraying, and there is also a problem that the ground stabilizing effect is low.

The present invention has been researched and developed in view of the above problems. That is, the ground improvement and stabilization briquette body of the present invention does not generate dust before and during construction, but is rapidly mixed when added to the ground and the outer peripheral portion of the briquette body is covered with the ground and uniformly distributed in the ground. It is an object of the present invention to provide a ground improvement and stabilizing briquette body which is dispersed and mixed in the ground, has a high effect of stabilizing the ground, and is expected to greatly improve the construction capacity of the ground stabilization treatment.

[Structure of the Invention] [Means for Solving Problems] The present invention relates to a ground improvement and stabilizing briquette body capable of solving the above technical problems, and a hydraulic property of at least one of cement, slag, and gypsum. Composition: 5 to 95 parts by weight, quick lime or magnesia lime or a mixture thereof; 5 to 95 parts by weight,
And a disintegration aid for the above hydraulic composition; 0.5 to 1.5% by weight
Are mixed, pressed and molded into a briquette.

Furthermore, a disintegration retarder can be added and mixed.
It is preferable to use β-starch or saccharide as the disintegration aid.

The ground improvement and stabilization briquette body according to the present invention is a hydraulic composition composed of at least one of cement, slag, and gypsum, which is used for ordinary ground stabilization treatment, quick lime or magnesia lime or a mixture thereof, and a disintegration aid. It is a briquette body which is used for pressure stabilization of ground by adding and mixing.

The shape of the ground improvement stabilizing briquette body according to the present invention is
It is preferably in the shape of an almond, and dust is hardly generated before, during, and after the application.

That is, the ground improvement stabilized briquette body product provided by the present invention is added and mixed in an amount of 1 to 40% by weight, preferably 2 to 20% by weight, more preferably 4 to 10% by weight with respect to the soil, and laying it evenly. After that, the ground stabilization treatment can be performed by rolling with a roller, a curler roller, a bulldozer, or the like.

As the hydraulic composition used in the present invention, for example, cement, gypsum, slag can be used as long as the material has hydraulic properties, as the cement is usually Portland cement, and it is possible to use all other cements. it can.

The quick lime used in the present invention may be normal quick lime, but calcined lime or hard lime can also be used. In this case, it is preferable to adjust the particle size of the quick lime in order to efficiently exhibit the expansion characteristics.

The disintegration aid used in the present invention usually maintains the molded state of the ground improvement and stabilizing briquette body, and promotes the collapse of the ground improvement and stabilizing briquette body itself in the ground,
It is for accelerating the reaction. And, as this disintegration aid, starch, sugar, pulps, Contex (trade name: manufactured by Mutsyo Sangyo Co., Ltd.) and the like are suitable. For example, any kind of starch can be used. Yes, but β-starch is the most preferred. And, the addition amount of these disintegration aids is 0.5 to the hydraulic composition.
1.5% by weight is preferred.

Further, it is preferable to add and mix 0.1 to 20% by weight, more preferably 0.1 to 1.5% by weight, of a disintegration retarder to the ground improvement and stabilizing briquette. This disintegration retarding agent is, for example, in the case of improved stabilization treatment of soft ground, for delaying the disintegration so that the ground improved and stabilized briquette body of the present invention does not collapse until it sinks into the deep part of the soft ground, that is, The ground improvement and stabilization briquette body of the present invention is for being sunk in the deep portion of the soft ground and then collapsing to be uniformly dispersed and mixed with the soil. As the disintegration retardant, alcohols as well as oils such as silicone oil can be used. In this case, by immersing the pressure-improved ground improvement stabilizing briquette body in the above-mentioned collapse retardant for a certain period of time,
It can be impregnated and / or attached. The impregnation and / or the adhesion treatment with such a disintegration delaying agent causes a hydration delay in the ground improvement and stabilizing briquette body of the present invention, for example,
In the case of the stabilization treatment of the soft ground as described above, it is possible to hold the molded state until the ground reaches the deep portion of the soft ground, and it is expected that the storage stability of the ground improvement stabilizing briquette body is improved.

The ground improvement stabilized briquette body product of the present invention is sprayed on the ground to be improved with the following composition in order to obtain a predetermined uniaxial compressive strength of the ground. The results were as follows.

In the field experiment, the amount of spray to obtain the target uniaxial compressive strength of 20 kgf / cm ² was 133 kg / m ³ .

Next, as an example of the present invention, a method for producing a ground-improved stabilized briquette body product formed into an almond shape will be described.

(1) After mixing tough rock, quick lime, and a disintegration aid with a twin-screw mixer, (2) a reciprocating paddle-type mixer (hereinafter referred to as a pag mill)
Mix with.

(3) The mixture powder obtained in (2) is fed between two rollers (hereinafter referred to as briquette machines) which rotate in mutually opposite directions.

(4) One of the two rollers in (3) rotates around the fixed shaft, but the other one roller receives a hydraulic pressure of 100 to 130 kg / cm ² from the opposite direction by a hydraulic machine. This hydraulic machine pressurizes and forms into an almond shape to produce a ground improvement stabilizing briquette body made of a mixture of tough rock, quick lime and a collapse aid.

In this case, the almond-shaped ground improvement and stabilization briquette body may be dipped in oils such as silicone oil, alcohol or the like. The particle size of the quicklime added and mixed to the ground improvement stabilizing briquette body used in the present invention is preferably one that passes through a 5 mm sieve, and more preferably one that remains on a 1 mm sieve, The size of the quicklime particles can be arbitrarily selected according to the construction method. Further, the shape of the ground improvement stabilizing briquette body used in the present invention is preferably an almond shape as described above, but its size is preferably about 3 cm in major axis and about 1 cm in minor axis, but more Large and small can be appropriately selected according to the actual ground stabilization treatment.

The ground improvement stabilized briquette body product produced by the present invention can be used in roadbed and sludge treatment. The ground improvement and stabilization briquette body product of the present invention is useful for promoting dispersion of the briquette body, preventing strength reduction, and preventing dust generation.

Next, the present invention will be explained by the production of the ground improvement stabilized briquette body product and its comparative test, but the present invention is not limited thereto.

[Example 1] Immersion disintegration test of ground improvement stabilization briquette product using quicklime with a particle size adjusted to 3 mm Quicklime 10 with a particle size adjusted to 3 mm in 90 parts by weight of cement 10
Parts by weight, and 0.9 parts by weight of β-starch (that is, 1% by weight based on the weight of cement) are mixed, and a briquette machine
An almond-shaped briquette body was manufactured under a pressing force of 110 kg / cm ² . In addition, for comparison, four types of briquette bodies were produced, including those made of cement only and those made by changing the cement / quick lime ratio to 80/20, 70/30, and 50/50, respectively.

Each of the manufactured briquette body products was immersed in water for 30 minutes, disintegrated, and then washed and classified with a 100 mesh (147 μm) standard sieve to determine the residue as undisintegrated particles.

 The results are shown in Table 1.

From the above results, it was found that when 20 parts by weight of quick lime was mixed, almost all disintegrated and dispersed, but even 10 parts by weight, 85% disintegrated.

Next, a quick-lime compounding test was conducted in the following manner, using fine-grain quicklime having a particle size of 3 mm or less.

[Example 2] Water immersion disintegration test using fine-grained quicklime crushed to a particle size of 3 mm or less The mixing ratio of cement / quicklime was 95/5, 90/10, 80/20.
As the quick lime, a fine powder of 3 mm or less was used. Also, β-starch was used as a disintegration aid, and the compounding ratio of cement to the cement was 1% by weight. The comparative test method was performed under the same conditions as in Example 1 above. Table 2 shows the results.

In this result, even if the particles of quick lime were made fine, the disintegration rate did not increase but decreased. It is considered that this is because the amount of expansion of the quick lime was reduced due to the mixing of the fine powdered quick lime having a particle size of 1 mm or less, and the pushing force against the cement particles was insufficient.

Next, a water immersion test was carried out using quicklime particles whose particle size was adjusted within the range of 1 to 3 mm.

[Example 3] Water immersion disintegration test using quick lime with a particle size adjusted to 1 to 3 mm The mixing ratio of cement / quick lime is 95/5, 90/10, 80/20.
The quick lime particle size is 1.0 to 3.0 mm, and the disintegration aid is β-
Starch was used at 1% by weight for each cement. The pressing force for forming the briquette body is 110 kg / cm ² . The comparative test method is the same as in Example 2 above. The results are shown in Table 3.

In this result, the disintegration dispersion rate was higher than expected even when 5 parts by weight of quick lime was mixed, and the initial purpose was achieved.

A soil stabilization test was carried out using ground improvement stabilizing briquette bodies having these mixing ratios.

As a result of the above test, when the ground improvement stabilizing briquette body of the present invention was used, not only during the transportation work before spraying but also during spraying or after spraying and during the mixing work with soil, almost no dust was generated. Etc., and without causing damage to surrounding agricultural products, automobiles, laundry, etc.,
In addition, the amount of ground improvement and stabilizing briquette used was reduced, and the working time was also greatly reduced.

[Effect of the invention] As the effect of the ground improvement and stabilizing briquette body of the present invention, firstly, almost no dust is observed during transportation, during spraying, after spraying, and during mixing operation with soil, Remarkably facilitating ground stabilization work. Secondly, after the ground improvement and stabilization briquette product is mixed with soft ground soil, it reacts with the water in the ground, and due to its water absorption expansion force because it contains quick lime, It is possible to provide a product that can be easily disintegrated by appropriately disintegrating the briquette body and can exert an effect on soil stabilization, and thirdly, by the disintegration aid contained in the ground improvement stabilizing briquette body, to disintegrate the fine particles themselves. Can be promoted more,
It is possible to provide a briquette molded product composition. Fourthly, the ground improvement and stabilization briquette product of the present invention has brought about a ground improvement and stabilization treatment method capable of obtaining a ground stabilization effect superior to the conventional method, and fifth. By the addition of the disintegration retarder, the disintegration delay is delayed so that the ground improvement stabilizing briquette body of the present invention collapses after sinking to the deep part of the soft ground, dispersion in the deep portion,
Various remarkable technical effects such as being able to provide a ground improvement and stabilizing briquette body capable of improving and improving mixing have been obtained.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C09K 17/44 C09K 17/44 P 17/50 17/50 P // C09K 103: 00 103: 00 (72) Inventor Yasushi Naruse 1339 Kaminamikata, Ibigawa-cho, Ibi-gun, Gifu Prefecture (56) References JP 59-85018 (JP, A) JP 59-84972 (JP, A) JP 49-40299 (JP, A)

Claims (3)

(57) [Claims] 1. A hydraulic composition comprising at least one of cement, slag and gypsum; 5 to 95 parts by weight, quick lime or magnesia lime or a mixture thereof; 5 to 95 parts by weight with respect to the above hydraulic composition. Disintegration aid; 0.5 to 1.5% by weight are mixed, pressurized and molded into a briquette to obtain a ground improvement stabilizing briquette body. 2. The ground improvement and stabilizing briquette body according to claim 1, wherein a collapse retardant is added and mixed. 3. The ground improvement stabilizing briquette body according to claim 1 or 2, wherein the disintegration aid is β-starch or saccharide.