JPS59193977A - Static crushing - Google Patents

Abstract

PURPOSE:Holes bored in the substrate to be crushed are filled with lumps of a swelling agent for crushing which contains a specific amount of calcium oxide, then a solution of lignin sulfonate salt is injected into the holes to effect static crushing of structures or other constructions, as the swelling by hydrative slaking is exactly controlled with time. CONSTITUTION:Static crushing is effected by filling holes bored in the substrate to be crushed with a swelling agent for crushing which contains 50% or more CaO and is in the form of lumps or molded products by compression, of its powder, then pouring, into the holes, a solution of at least one selected from ligninsulfonate salts, polyvinyl alcohol, ligninsulfonate-polyol complex, naphthalenesulfonic acid-formaldehyde polycondensates and triazine polycondensates in water, preferably in a concentration of more than 0.1wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a static crushing method that utilizes the volumetric expansion of cow ash (Cab) due to its hydration reaction.

The static crushing method of this god is
As shown in -C, a perforation formed in a trench structure or the like is filled with a substance that expands in volume through a hydration reaction, such as quicklime or 9.32 dolomite, and water is supplied to this filling,
There are several well-known methods of crushing the filler using the hydration expansion force of the filler.

However, in the above method, the hydration reaction proceeds extremely quickly, so the thermal energy generated by the hydration reaction rapidly accumulates inside the borehole, causing the water inside the borehole to vaporize and explosively protrude to the outside. However, there were problems in that not only the desired crushing effect could not be obtained, but also the process was extremely dangerous.

For this reason, it has been proposed and put into practical use to use a mixture of water and a hydration reaction retarder instead of water. In this method, a mixture of water and a hydration reaction retardant 1 is mixed in advance with an expansion agent for crushing which expands in volume through a hydration reaction, and the mixture is press-fitted into holes drilled in the object to be crushed. The crushing membrane 1 material used in this method is a powder material, to which a cement composition, 6-containing material, and concrete 1 to water-reducing agent are added in order to control hydration expansion.

However, in this method of pre-mixing a crushing swelling agent with a mixture of water and a hydration reaction retarder and filling it into the perforation, the temporal control of hydration digestion Wf and eye is slow, and the crushing time is slow. It takes a long time, over 10 hours. In addition, there are many types of expansion agents for crushing, and they are used depending on the temperature above the specified temperature.
There is a predetermined temperature range, and if the stone is used at a temperature exceeding this predetermined temperature range, or if it is filled into a hole with a hole diameter of 50 mm or more, the above-mentioned phenomenon of water vapor protrusion may occur. However, it was inconvenient and dangerous to use.

The present invention has been made in view of the above-mentioned conventional deficiencies, and its purpose is to crush objects to be destroyed such as structures while controlling the hydration-digestion expansion to be positive (11) in time. This is to provide a method.

In the static crushing method of the present invention, a crushing swelling agent containing 50% or more of quicklime (Cab) is filled in advance into the perforations of the object to be crushed, and then water is inhibited from penetrating into the filled swelling agent. By injecting a solution containing a substance at a predetermined concentration, the hydration and expansion can be precisely controlled in terms of time and fragmentation.

As this membrane III agent for crushing, a material obtained by compression molding a lump containing 50% or more of CaO or a powder having a particle size of 0.25 mm or less, which is obtained by hard-sintering limestone or dolomite at 1300 to 1700 DEG C., is used. This compression molded product generally has a volume of Q, 05+;+1' or more and a high specific gravity of 2.3.
This product is compression molded into the above three-dimensional shape (hereinafter referred to as briquette 71').

In the present invention, substances that suppress water penetration include lignin sulfonate, polyvinyl alcohol, lignin sulfonate polyol complex, naphthalene sulfonate polymarine high condensate, high condensed trimazine compound, and mixtures thereof. Particularly excellent TC material Genin sulfonate, polyvinyl alcohol, lignin sulfone 1 liter
jf J! ii and a high condensate of formalin and phthalin sulfonate.

These substances are dissolved in water at a concentration of at least Q, 1 wt% or more.

As an example of implementing this static crushing method, for example, a hole with a diameter of 65 mm and a hole length of 1 m is formed in a rock to be crushed, and 93% of CaO is added as a crushing expansion agent into the hole.
After filling the briquettes containing lignin sulfonate (trade name [Hozolith 5L]
When a solution of this substance dissolved in water at a concentration of 3.3 wt % was injected at 1.3 degrees Celsius using J), the rock was crushed in about 2 hours.

In addition, 6.7W1% of a substance that suppresses the penetration of this same water
) When injected into 61 Grindoshiku 1iij, it was crushed in about 6 hours. On the other hand, under the same conditions as above, when water (J) was injected without using any substance to suppress water penetration, a protrusion phenomenon of water vapor occurred after about 10 minutes, and the rock In addition, in the case of the method described in the above-mentioned prior art, 115 for crushing; ), and when this mixture of swelling agent 111j and water was injected into a borehole in the same rock, it took about 15 hours to crush it.

As mentioned above, according to the static crushing method according to the present invention,
As a crushing swelling agent, a lump containing 50% or more of CaO or Free Cooler 1 is placed on the object to be crushed (after filling it in the drilled hole, before) and dissolves a substance that suppresses the penetration of water such as boiling. By injecting the solution, it becomes possible to crush in a shorter time than when using a conventional mixture of a powdered crushing swelling agent mixed with water in advance. In addition, by appropriately setting the m degree of the substance that suppresses water penetration in the solution according to the temperature, the hydration and digestion expansion of the crushing leavening agent can be carried out in a timely and accurate manner. It is possible to control the crushing time within the range of 30 minutes to 24 hours, making it an extremely excellent static crushing method for buildings, etc.

Next, examples of the present invention will be shown.
used for. Limestone was used as the material to be crushed, and a hole with a hole diameter of 65 ml and a hole length of 1 m was bored into it.

As substances that control water penetration, lignin sulfonate (trade name: "Hozolith 51J") and lignin sulfone M
Using a mixture of m and naphthalene sulfonic acid pomarin high condensate (trade name = 1-Kao Mighty '100J),
The following samples 1 to 4 were dissolved in water at a concentration of Lp.

Samples 1 to 3 used genin sulfonate at concentrations of 1.7 wt% and 3.3 wt%, respectively.6. , 7wt%
The sample Jul/l is an aqueous solution in which the mixing ratio of lignin sulfonate and naphthalene sulfonic acid formalin high condensate is 1:2, and the concentration of this mixture is 1 (ML%).

After filling the above-mentioned perforation with 1.3 kg of the above-mentioned crushing swelling agent, each of the aqueous solutions of samples 1 to 4 was injected at 1.3°C, the crushing time was measured, and the results are shown in the table below. child .

- [As is clear from the examples below, by using a solution containing a substance that inhibits water penetration,
Although it is possible to shorten the distance i, it is also possible to crush in any time by appropriately selecting the distance m.

Example 2 Contains 90% CaO as an expanding agent for crushing and has a particle size of 2 to 5
A lump whose particle size was adjusted to +nm was used. The same limestone as in Example 1 was used as the material to be crushed, and the pore diameter and length were also the same.

As a substance that controls water penetration, the mixing ratio of lignin sulfonate and naphthalene sulfonic acid formalin high condensate is 2.
:5 mixture was used, and the concentration of this mixture was 17. Owt%
I made a solution of 4.3 Insert the crushing agent into the above hole.
- After filling, the above solution was injected at 1.3° C., and it was possible to crush the solution within two steps.

Claims (1)

[Claims] 11Gj for crushing, which is made by compression molding a lump or powder containing 50% or more of CaO into a hole made in the object to be crushed.
Filled with a lignin sulfonate, polyvinyl alcohol, lignin sulfonate polyol complex, naphthalene sulfonate formalin high condensate content, and high condensation 1, rimazine-based compound or Static crushing force d, characterized in that the crushing action is controlled by injecting a solution in which these 7ff1 objects are dissolved.