JPS61186695A - Material for underwater crushing of fragile matter - Google Patents

Abstract

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

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a material that statically crushes brittle objects such as rocks and concrete without producing dust, noise, or flying stones. It is something. Specifically, if a hole drilled in a brittle object is filled with water, or if the brittle object is underwater and the hole drilled is inevitably filled with water, the hole is filled with water. It concerns the crushed material to be injected.

(Prior art) Generally, when trying to crush a brittle object in water,
For example, a water-impermeable elongated bag such as a vinyl tube is inserted in advance into the hole that has been punched in a planned manner, as shown in 5 of ``Method for Destruction of Unexamined Patent Publications'', and then an expanding material slurry is injected, or Or, for example, JP-A-57-7a 47%
A method has been proposed in which a crushing cartridge containing a crushing agent is inserted into a water-permeable container, as shown in ``Water-Usable Expandable Shredding Cartridge''.

In addition to the complexity of inserting a vinyl tube into each perforation, the drawback is that if the tube gets twisted or bent when inserted into the hole, it is impossible to inject into the area below that point. There was a ka-. Furthermore, according to Japanese Patent Application Laid-open No. 57-74474, in order to insert a cartridge at a depth of 2 to 6 depths, it is almost necessary for a diver to insert the cartridge completely into the hole. The disadvantage of this method is that the crushing effect cannot be achieved unless the material inserted into the hole is compacted to fill the voids in the individual cartridges.

The present invention solves the problems of conventional materials as described above, and provides a material that can inject an expanding material into a brittle object existing in water using the same operation and method as filling a hole drilled on land. This is what I am trying to do.

(Means for Solving the Problems) The present invention provides an expansible material whose active ingredient is quicklime or an inorganic compound of quicklime. By using a separation-reducing agent to reduce separation of materials in water, the crushing agent slurry can be easily injected into the pores of a brittle object existing in water.

In other words, we have created a material that can fill a crushing agent slurry into water-filled holes without causing dilution or separation of the material, and has a crushing effect similar to that of conventional crushing agents.

That is, the present invention is a material for underwater crushing of brittle objects such as rocks and concrete, which is characterized by containing an expandable material, a heavy aggregate, and a separation reducing agent.

To explain further, the expandable material applies expansion pressure to the brittle object, causing it to fracture. In addition, the heavy aggregate promotes sedimentation of the slurry and also fills the slurry without gaps, leading to crushing.

Additionally, the segregation reducing agent allows the crushing agent slurry to prevent water in the pores from diluting and separating the material, allowing for complete filling.

(Operations and Effects of the Invention) The expandable materials used in the present invention are those whose main component is quicklime or an inorganic compound of quicklime, such as "Plystar" by Onoda Cement Co., Ltd., "Nismite" by Sumitomo Cement Co., Ltd., Japan Static crushing agents currently available on the market, such as Yuki Giken/Nippon Cement's ``Calmite'' and Yoshizawa Lime Co.'s ``Sujiliter'', can be applied, but in order to shorten the crushing time, K is It is preferable to use one consisting of 60 to 90 parts by weight of quicklime with a crystal diameter of less than 10 μm and 10 to 70 parts by weight of a rapidly hardening hydraulic substance (for example, the trade name "Denka Chemiax").

On the other hand, the IT aggregate used in the present invention only needs to have a specific gravity of 6.0 or more, such as iron powder, steel fiber, magnetite, iron sand, magnetite, hematite, iron phosphate, pallite (barite). and converter slag, etc. can be applied, but there are issues with fluidity when turning the expandable material into a slurry, the balance of the difference in specific gravity between the expandable material and the aggregate, and the unit price of the material as an aggregate. Therefore, iron powder, magnetite, pallite, and pulverized converter slag are preferable, and pulverized converter slag is most preferable.

For 60 to 90 parts by weight of hs tensile material added to the heavy aggregate,
10 to 40 parts by weight is preferred. If the weight aggregate is less than 10%, the specific gravity of the expandable crushing agent slurry becomes too light, making it difficult to fill underwater holes in a short time. On the other hand, if the weight of the aggregate is 40 inches or more, the expandable component will be diluted, so the crushing time in water will be longer and the desired effect will not be obtained.

On the other hand, examples of the separation reducing agent used in the present invention include ethylhydroxymethylcellulose, ethylhydroxymethylcellulose, carboxymethylhydroxyethylcellulose, sodium calexymethylcellulose, hydroxyethylcellulose, hydroxyzolobyl cellulose,
In addition to cellulose ethers such as hygroxyzorobil methylcellulose, methylwhispercellulose, and ethylhydroxymethylcellulose,? lyethylene oxide,
Examples include polyacrylamide, but water-soluble cellulose ether is preferable in view of the effect of reducing separation in water, which is the objective of the present invention.

The amount of the separation reducing agent added is preferably 0.5 to 6 parts by weight per 100 parts by weight of the main material consisting of the expandable material and the heavy aggregate. If the amount added is less than 0.5 parts by weight, material separation will be large when injected into water, and the crushing agent slurry will be diluted with water, resulting in a significant lengthening of the crushing time. On the other hand, if the amount added is 6 parts by weight or more, the fluidity of the kneaded slurry will be impaired and the time required for filling will become longer. The most preferable addition amount of the separation reducing agent in the present invention is 1.0 to 2.0
Parts by weight.

(Example) The present invention will be explained in more detail with reference to Examples.
The present invention is not limited to this.

Incidentally, parts and parts shown in the following Examples and Comparative Examples refer to weight parts, respectively, unless otherwise specified.

Example 1 Commercially available “Denka Chemiax+15J” as an expandable material
(Kikagaku Kogyo@) was used as a heavy aggregate, converter air crushed slag (hereinafter referred to as slag) (manufactured by Nippon Kokan Fukuyama Factory, specific gravity 3.
65), and methyl hydroxyethyl cellulose (Daiichi Kogyo Yakuhin) was used as the water-soluble cellulose ether.
The crushed materials mixed at the mixing ratio shown in 1 were mixed at a water-to-material ratio (W/A) of 60% to prepare a slurry.

This slurry was kneaded in a room at 20°C, and the outer diameter was 150.
The mixture was poured into a mortar specimen having a diameter of 38 mm, an inner diameter of 38 n, and a height of 600 mm, and its filling property and crushing time were measured.

The results are also listed in Table-1.

Comparative Example 1 The same procedure as in Example 1 was carried out except that slag was not used. The results are also listed in Table-1.

Example 2 An experiment was conducted in the same manner as in Example 1, using the raw material formulation of Jikkenma 4 as a base, and varying the amount of the separation reducing agent (hereinafter referred to as reducing agent) as shown in Table 2. Table 2 of the results
Also listed in

Comparative Example 2 The same procedure as Example 2 was carried out except that no reducing agent was used. The results are also listed in Table-2.

Example 3 Approximately 1.57 pieces crushed by gunpowder blasting at a rough stone mining site
Two holes with a diameter of 42mm and a depth of 1200mm were bored in a 1L square limestone boulder, and the holes were filled with a slurry using the material of the present invention shown in Experiment I69 of Example 2.

When left at an outside temperature of 15 to 20"C, 11
Shattered in time. Note that the filling hole was filled with water in advance, and the slurry was directly injected into the water hole.

As a comparative example, a similar hole was made in a limestone boulder of the same size and filled with water, and only Chemiax+15 was slurried and received in this hole. As a result, it took 22 hours to crush.

Example 4 An inorganic compound of lime (trade name "Plystar 150" manufactured by Onoda Cement Co., Ltd.) was used as the expandable material, and iron powder (trade name "Electrolytic Iron Powder-200" manufactured by Shiraishi Metals Co., Ltd.) was used as the M food aggregate.
In addition, methyl cellulose (trade name "Metrose", Shin-Etsu Chemical Co., Ltd. ff) was further used as a separation reducing agent, and the same test as shown in Example 1 was conducted. Table 31C shows raw material composition and results.
show.

(Effects of the Invention) The material for underwater crushing of brittle objects according to the present invention is a combination of an expandable material, heavy aggregate, and a separation reducing agent, which makes it easy to replace water in the hole, and the material dilution with water is reduced, allowing for crushing in the same amount of time as during boring without water.

Furthermore, since dilution with water is reduced, the operation of inserting a vinyl tube or the like into the hole is no longer necessary, and the cost of both auxiliary materials and labor for construction is reduced.

Therefore, compared to the conventional technology, the product of the present invention has the effects of reducing separation of slurry by water, shortening the time required for crushing, and improving work efficiency.

Claims (1)

[Claims] (1) A material for underwater crushing of brittle objects such as rocks and concrete, characterized by containing an expandable material, a heavy aggregate, and a separation reducing agent.