JPS6140970A - Solid static destruction agent - 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] [Technical field of invention] The present invention relates to improvements in static crushing agents.

[Prior art]

Recently, there has been a lot of work such as repairing or demolishing part or all of old structures, and a lot of work is being done to destroy rocks and concrete in highways, tunnels, land development, underwater construction, etc. Traditionally, explosives, heavy machinery, etc. were mainly used for these construction works, but construction methods using these methods caused a lot of pollution such as noise, vibration, flying stones, and dust generation, and sometimes the work was completely impossible. received. Moreover, the work requires considerable skill.

In order to eliminate the drawbacks of the construction method using gunpowder, etc. mentioned above,
A construction method using static crushing agents was developed.

Static crushing agents currently on the market are so-called expansive clinker, which is made by blending lime (CaO), calcined dolomite (Cao HMg0), etc. with gypsum, clay, etc. and firing it at a high temperature, and then adding inorganic materials to adjust the expansivity. It is a mixture of compounds or organic compounds and pulverized. The method of using a static crushing agent is to add approximately 30 grams of water to the above-mentioned finely ground static crushing agent, mix thoroughly with a mixer for 1 to 2 minutes, and then crush the static crushing agent. A slurry of a crushing agent is poured into holes or grooves prepared in advance in the object to be crushed, and cracks are generated in the object by the water expansion pressure of the static crushing agent. . 10-24 for crack formation
It takes time to apply a blow to the cracked area using a breaker, ripper, etc., and the object to be crushed is completely crushed.

By using the above-mentioned static crushing agent, the disadvantages of construction methods using gunpowder, etc., such as pollution and environmental contamination, were removed; however,
Conventional static crushing agents have also been plagued with problems. The first is that it takes a very long time for cracks to appear in the object to be crushed. In other words, in the conventional slurry pouring method, it takes about half a day to one day for cracks to occur after pouring, and this tendency is greatly influenced by the ambient temperature, and in winter it may take even longer or if special conditions are required. Required curing techniques.

In addition, in the slurry pouring method, making the slurry itself is a very hard process, and in addition, excessive water is used compared to the static crushing agent, so there is a sudden drop in the restricted part of the hole. As the exothermic reaction progressed, there was a strong possibility that an eruption phenomenon would occur. This eruption phenomenon not only causes loss of crushing agent, but also poses a danger to workers.

[Purpose of the invention]

The present invention eliminates the drawbacks of the conventional static crushing agent, is easy to handle, such as filling and adjusting the amount of water, has a high crushing effect, shortens the time until cracking occurs, and prevents the eruption phenomenon. The purpose of the present invention is to provide a solid static crushing agent that can improve work safety.

[Summary of the invention]

The solid static crushing agent of the present invention can be produced by adding a sintering accelerator to a lime raw material, press-molding it into a predetermined size, and then drying and calcining it, or by adding a sintering accelerator to a lime raw material. The product is characterized in that the hydrated expandable material obtained by firing the product is pressure molded to a predetermined size, solidified, and then vacuum packaged.

The details will be explained below.

[Embodiments of the invention]

Since it is possible to know in advance the physical properties of the object to be crushed using a static crushing agent, various properties such as minerals, purpose of crushing, etc., the dimensions of the holes, grooves, etc. for filling the static crushing agent, etc. The number, installation position, etc. are set in advance.

The solid static crushing agent of the present invention is controlled in a factory with dimensions that match the above-mentioned perforations, grooves, etc. (the dimensions of the grooves may be smaller than the diameter of the perforation, but dimensions close to these are preferred). In this state, it is pressurized and molded using a mold.

The method for producing the solid static crushing agent of the present invention can be roughly divided into two steps as described above. There are two methods: (2) one that involves firing and vacuum packaging the product; and (2) one that involves adding a sintering accelerator to the lime raw material, which is then pressure molded after firing and then vacuum packaging. become.

The above-mentioned lime raw materials include limestone, quicklime, slaked lime, dolomite, calcined dolomite, digested dolomite, etc., and in the procedure (1) above,
In addition to this, it also includes materials that have been calcined according to step (2) and given water expansion properties (commercially available static crushing agents, etc.). It is called a sintering accelerator.

The substances used include alkalis, alkaline earths, clay gypsums, iron oxides, aluminum, etc.

When starting the mixed raw materials of lime and sintering accelerator according to the above procedure (1), 1 to 3 g of water is first added to the mixed raw materials, and this is put into a mold and pressure-molded. Pressure is usually 5
Perform at 0 kg/- or more. After demolding, it is dried and fired, but the firing process is similar to firing hydraulic compounds such as ordinary Boltland cement clinker. In this case, it is not necessary to calcinate until clinker is completely generated, and it is sufficient that at least 1 (1 or more) free CaO remains.

When molding the crushing agent, shapes such as tiles, drum-shaped bricks, cylinders, or almond-shaped briquettes are made. At the time of pressure molding, one or more kinds of surfactants can be used for compaction, demolding, and improving the strength of the solid material after demolding.

When the demolded solid material, ie, the green material, is fired, the firing temperature is adjusted depending on the content of the formulation, particularly the amount of flux with a low melting point such as an alkaline earth compound.

Front handle 711 (2) When the mixture of lime raw materials and sintering accelerator is baked to form a hydration-expandable material, and this is pressure-molded using a mold, start from the raw materials. Alternatively, you can start by using a static crushing agent that is already commercially available as a hydration-swellable material. Depending on the state of the molded product after molding, it may be re-fired, but this corresponds to the case where lime raw material that has been fired once and given water expansion properties is used in step (1) above. Become. After solidifying as described above, vacuum packaging is the same as in steps (1) and (2).

Alternatively, the product molded and fired in a mold as described above can be crushed into granules, which can then be vacuum packaged and used.

Incidentally, the solid static crushing agent may also contain a promoter or a retarder of the water utilization reaction.

Vacuum packaging prevents the solidified static crushing agent from weathering and enables long-term storage, and conventional packaging methods can be used. For example, double layer bags of nylon and polyethylene (0.2-0.5-thickness) as packaging materials
If a vacuum level of about 10 degrees Hg is used, there will be no change in quality even after long-term storage (possible for more than one year).

To use the solid static crushing agent of the present invention, first, holes or grooves of the required number and size are made in the object to be crushed based on a survey conducted in advance, and the required amount of solid static crushing agent is inserted into the holes or grooves. The product is taken out of the vacuum packaging and filled, and then water is poured or sprinkled on it to cause a water use reaction. In this case, the packing density of the solid static crushing agent in the body to be crushed is high, which significantly shortens the crushing time. It is easy to adjust the amount of water required for irrigation. In the conventional slurry one-type system, a large amount of water is used from the beginning in order to fluidize the static crushing agent so that it can be easily filled, thereby slowing down the initial water utilization rate. However, when using the solid static crushing agent of the present invention, water is gradually poured after filling the crushing agent, so
It was observed that the heat generated by the initial water use was effectively used in the subsequent water use reaction, and the expansion rate was fast. in this way,
After filling a pre-formed solid static crushing agent, pouring or spraying the amount of water necessary for water utilization reaction and expansion is a new and completely unpredictable method of using conventional static crushing agents. It is crushed using a method that is extremely effective in terms of crushing effect.

Next, some examples of actual use of the solid static crushing agent of the present invention will be shown.

Example 1 (1) Raw material: Commercially available static crushing agent splitter orange...
...95(2) Sintering accelerator iron dioxide
・・・・・・5 Mix the above ingredients well, then mold (φ40m)
, thickness 6mm) filled with K, pressurized to 50kg/m, molded into a disc shape, baked at 1200°C for 1 hour, and then vacuumed to 10+
A solid static crushing agent was produced by vacuum packaging at mHg.

The above solid static crushing agent was applied to cutting and limited crushing of concrete. FIG. 1(a) is a cutaway view, and FIG. 1(b) is a cross-sectional view showing a state in which a crushing agent is filled for limited crushing. In the figure, R is the object to be crushed, 1 is the groove provided in the object to be crushed, and 2 is the solid static crushing agent taken out from the vacuum packaging.
(more than 1 month). In the case of limited crushing (b), the grooves at both ends are emptied and every other groove is filled with crushing agent.

After filling as described above, water was poured into the container at a ratio of 90 parts of crushing agent to 10 parts of water to cause water expansion. As a result, it took 30 minutes for cracks to occur. On the other hand, when a similar object to be crushed was filled with a conventional crushing agent slurry, it took 10 hours for cracks to occur. The use of the solid static crushing agent of the present invention resulted in a significant reduction in crushing time.

Example 2 In the same manner as in Example 1, "Sprinter-iron decaoxide" was pressure molded and fired, and then lightly pounded to size 3 to 1 to give a granular crushing agent. This was vacuum packed in the same manner as in Example 1.

This granular static crushing agent was taken out from the packaging after being stored for 6 months, and mixed with 1 to 6 pieces of dry sand and crushed sand at 6 degrees, and filled into the same crushing object as in Example 1. % water injection, it took only 45 minutes for cracks to occur.

Example 3 Raw materials mixed in the same manner as in Example 1 were put into a mold of 50 min. I made a crushing agent.

In the center of the concrete specimen (ψ150 x 300 m, 4-week compressive strength 300 Y/-), drill 50 mm x 20 C.
The hole 1a+& was cut out, and the solid static crushing agent (stored for 3 months or more) taken out from the package and sand were alternately filled into the hole and water was poured into the hole. At this time, the temperature of the specimen was 10°C.

The specimen f'i was crushed in 50 minutes. It took Y'i 12 hours for one type of conventional slather IJ.

FIG. 2 is a cross-sectional view showing the above-mentioned filling state, where R in the figure represents the object to be crushed (concrete specimen), 1 represents the perforation, 2 represents the solid static crushing agent, and 6 represents the sand.

Example 4: Raw material limestone (-44μ) 70 and sintering accelerator clay (-
44μ) 25 and iron oxide (reagent) 5 were blended and pressure molded using the same mold as in Example 6 (50vMψ×40fi thickness), which was baked at 160°C for 2 hours and vacuum packaged. After storing this for 6 months, it was filled into a concrete specimen and watered in the same manner as in Example 6. As a result, cracks were observed in 60 minutes.

Example 5 A commercially available static crushing agent (Sprinter, orange type) was pressure-molded into a 25m x 13m almond shape using a Briquette machine, and then this briquette was crushed using a coarse crusher to form -5 gourd granules. Vacuum packaging (vacuum level 10-simplified kg, 2 minutes)
did.

Remove the above static crushing agent from the vacuum packaging immediately before use (storage period is 6 months), and place it on the center of the top surface of the object to be crushed (603 x 60" x 60 m concrete block) with a width of 10 m.
, a 100m deep, long 600W+ trench was filled, and then water necessary for irrigation expansion was injected.

It took 65 minutes for cracks to appear in the object to be crushed.

On the other hand, when a similar object to be crushed was filled with the conventional slurry, it took only 12 hours for cracks to occur.

〔Effect of the invention〕

By using the solid static crushing agent of the present invention as described above, it is possible to increase the packing density of the crushing agent into the perforation, fermentation, etc., and as a result, the time until cracking can be significantly shortened. In addition, there are various advantages such as eliminating the need for slurry mixing, making the filling operation very simple (the work time is reduced to about 1/6), and eliminating the gushing phenomenon, improving the safety of the work. You can get the same effect.

[Brief explanation of drawings]

FIGS. 1(a), 1(b), and 2 are cross-sectional views illustrating a state in which a solid static crushing agent of the present invention is filled into an object to be crushed. R: object to be crushed, 1: groove or perforation, 2: solid static crushing agent,
3: Sand. Agent Patent Attorney Sanro Kimura Figure 1 Figure 2

Claims (1)

[Claims] Hydration expansion made by adding a sintering accelerator to a lime raw material and press-molding it into a predetermined size, then drying and firing it, or by firing a lime raw material with a sintering accelerator added. 1. A solid static crushing agent characterized in that a static material is pressure-molded into a predetermined size, solidified, and then vacuum-packed.