JPH0245756B2 - HAKAIKOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a destruction method for destroying objects to be crushed by the expansion pressure generated by kneading an expansion crushing agent and water, and in particular, the invention relates to a method for destroying objects to be crushed by expansion pressure generated by kneading an expansion crushing agent and water. This paper relates to a destructive construction method that allows time to be controlled arbitrarily.

In general, expandable crushing agents containing calcium oxide (CaO) as a main component are widely used for demolition and crushing of concrete structures, rocks, and earth.

In other words, it uses the hydration expansion pressure generated by the reaction between CaO and water to destroy concrete structures and rocks, but on the other hand, when the hydration reaction of CaO progresses rapidly, heat generation causes the slurry temperature to drop. A sudden rise in the amount of water may cause a gushing phenomenon, which is dangerous and will result in a loss of crushing effectiveness. It is something to do.

However, the higher the concentration of CaO, the more the hydration reaction is promoted, and the rate of development of swelling pressure becomes faster.
It also has the disadvantage that it is more likely to cause eruptions, and that it takes a long time, half a day or a whole day, to crush the material while suppressing such eruptions.

To address these shortcomings, we have taken advantage of the temperature rise caused by the heat of hydration and filled it with an expansive crushing agent under conditions that cause the eruption phenomenon, and then continued to use ultra-rapid hardening cement or cement with comparable performance. A destructive method has been proposed that can crush materials in a short time of 1 to 5 hours by tamping fast-setting cement paste, mortar, or concrete.

However, even with this type of destruction method, in order to suppress the eruption phenomenon and shorten the time required for crushing, it is necessary to take into account various conditions such as the temperature of the object to be crushed, the outside temperature, and the diameter of the hole drilled. There was a problem in that the components and particle size of the expansible crushing agent had to be adjusted accordingly, and the expansible crushing agent with various ingredients adjusted in advance had to be prepared at all times. In addition, with the above-mentioned destruction method, the object to be crushed can be destroyed in one hour to an hour, but the time required for crushing can be controlled freely and accurately depending on conditions such as the temperature of the object to be crushed and the outside air temperature. Furthermore, if the object to be crushed is to be destroyed within one hour, the hydration reaction of the expandable crushing agent must proceed more quickly, so the above-mentioned There was also the problem of a gushing phenomenon resulting in a lack of safety.

On the other hand, in order to deal with such problems, as shown in FIG.
Insert a casing pipe 4 made of steel with a diameter of approximately 1.5 mm, install an electric heater 5 inside this casing pipe 4, turn on electricity, and control the heating level by adjusting the strength of the voltage to control the hydration reaction of CaO. Destruction methods have been proposed that control the progress and destroy objects to be crushed.

However, in such a destructive construction method, the electric heater 5 must be installed inside the casing pipe 4, so the casing pipe 4 needs to have a diameter larger than a specified value. If this is not the case, the filling amount of the expandable crushing agent will be reduced, the expansion pressure will be reduced, and the crushing effect will be reduced.

In addition, if the object to be crushed is a large object such as bedrock, the object to be crushed is removed using a so-called ripping operation or a bulldozer, which involves creating cracks using an expansive crushing agent and then ripping off the rock. Although it is necessary to carry out dosing work, it is difficult to recover the casing pipe 4 from the material 1 to be crushed.
Furthermore, if a large number of casing pipes 4 remain in the material to be crushed, there is a drawback in that they become an obstacle to the above-mentioned ripping and dosing operations.

The present invention was made in view of these conventional drawbacks, and its purpose is to be able to control the rate of progress of the hydration reaction of CaO, etc. in the expandable crushing agent, and to reduce the amount of hydration within an arbitrary time. It is an object of the present invention to provide a destructive construction method which is capable of crushing crushed materials and which does not impede ripping and dosing operations.

In order to achieve this objective, the present invention involves mixing an expandable crushing agent with water to destroy concrete structures, rocks, etc. by utilizing the hydration expansion pressure generated by the reaction with water, and then crushing the object in a slurry state. In this method, a covered heating wire is placed in the hole, the expandable crushing agent slurry is heated, and water is poured into the hole. By controlling the timing of the onset of the sum expansion pressure, the object to be crushed is crushed within an arbitrary time.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

First, as shown in Fig. 2, a hole 7 with a diameter of 65 mm and a length of 90 cm is made in a cube-shaped concrete object 6 with sides of 1 m, and a rubber tube with a length of 4 m is placed in the center of the hole 7. Insert the hotbed wire heater 8 covered with (for example, silicone rubber) into the hole 7,
Expandable crushing agent slurry 9 adjusted to a water/disrupting agent ratio of 22% is poured. Then, in order to prevent the expansible crushing agent slurry 9 from spouting out to the upper 20 cm of the hole 7, fast-hardening cement mortar 10 was tamped, and one hour after the tamping was completed (the ultra-fast hardening cement mortar was compressed to 50 Kgf/cm2 ^). When the strength was reached), the heater 8 was energized. The relationship between the time during which the concrete crushed material 6 was crushed and the crack width in this case is shown in FIGS. 3 and 4. In this example, the current values were both 10 A and 5 A, and for comparison, the case where no current was applied at all was also investigated. FIG. 3 shows the relationship between current value and crushing time, and FIG. 4 shows the relationship between crushing time and crack width. As a result, when a current of 5 A was applied for 4 hours, a crack with a width of 30 mm was formed, and when a current of 10 A was applied for 1.5 hours, a crack with a width of 50 mm was formed. As a result, the crushing time is significantly shortened as shown in FIG. still,
When no current was applied, a crack with a width of 10 mm only formed after 10 hours.

Next, using the same concrete object 6 as in the first embodiment, as shown in FIG. The same expandable crushing agent slurry 9 and tamping material 10 as in the first embodiment were used, and electricity was applied one hour after the completion of tamping. FIG. 6 shows the relationship between current value and crushing time in this second embodiment, and FIG. 7 shows the relationship between crack width and crushing time. the result,
When a current of 5 A was applied for 3.5 hours, a crack width of 33 mm was generated, and when a current of 10 A was applied for 1.3 hours, a crack width of 50 mm was generated. In addition, when no current was applied, a crack width of only 10 mm appeared after 10 hours.

Furthermore, as shown in FIG. 8, as a third embodiment, a concrete material to be crushed 6 similar to those of the above-mentioned embodiments is used, and a first hotbed wire heater 11 is disposed in the tamping material 10. A second hotbed wire heater 8 was disposed in the expandable crushing agent slurry section 9 to destroy the object 6 to be crushed. That is, at the same time as the mortar that is the tamping material is injected, a current of 10 A is applied to the hotbed wire heater 11 for 15 minutes to promote the strength development of the mortar that is the tamping material.
After the compressive strength reached approximately 50 Kgf/cm ² , a current of 10 A was passed through the hotbed wire heater 8 disposed in the expandable crushing agent slurry portion 9. As a result, the crushing time of the concrete object 6 was further shortened, and the crushing time was completed in one hour after the slurry was filled.

Therefore, as can be seen from the above-mentioned Examples, by heating using a hotbed wire heater, the expandable crushing agent slurry can be heated to a high temperature and the development of hydration expansion pressure can be accelerated. In addition, as shown in the second embodiment, the number of turns of the hotbed wire heater is made denser,
The amount of heat per unit area of the expandable crushing agent slurry is increased, and the hotbed wire heater configured as described above is used to intensively heat the central part of the object to be crushed, which has the highest heat storage capacity. By doing so, it becomes possible to destroy the object to be crushed more efficiently. Furthermore, as shown in the third embodiment, by heating the tamping material and the expandable crushing agent slurry using separate hotbed wire heaters, the tamping material is cured faster than the expandable crushing agent slurry. , it is possible to prevent the slurry from spouting out, and it is also possible to destroy the object to be crushed in a short time.

Further, FIG. 9 shows a fourth embodiment of the present invention.
In this embodiment, the hotbed wire heater 12 is formed in a spiral shape with a large diameter at one end and gradually becomes smaller toward the other end, and is inserted into the hole 7 with the small diameter portion 13 facing downward. It is arranged. Incidentally, the object to be crushed 6 is the same as in each of the above embodiments. and the hole 7 above
Expansive crushing agent slurry with a water/disrupting agent ratio of 22% 9
20 cm of the upper end of the hole 7 was tamped with ultra-fast hardening cement mortar 10 to prevent blowouts, and 1 hour after tamping was completed,
Compressive strength of ultra-fast hardening cement mortar 10 is 50Kg
When the temperature reached f/cm ² , the heater 12 was energized. Note that the outside temperature in this example is -5°C. As a result, crushing was completed in 4 hours when the current value was 5A, 1 hour when the current was 10A, and 10 hours when no current was applied.

Furthermore, FIG. 10 shows a fifth embodiment of the present invention. In this embodiment, a hotbed wire heater 12 having the same shape as that used in the fourth embodiment is used in the small diameter portion 1.
Example 3 was placed facing upward, and the experiments were conducted under the same conditions as in Example 4, except that the outside air temperature was 35°C. As a result, crushing was completed in 2 hours when the current value was 5A, 30 minutes when the current was 10A, and 8 hours when no current was applied at all.

Therefore, as is clear from the above examples,
By changing the installation direction of the hotbed wire heater 12, which is formed in a spiral shape with a large diameter at one end and gradually decreasing diameter toward the other end, depending on whether the outside air temperature is high or low, This makes it possible to carry out crushing work without any problems.

That is, when the outside temperature is low, since the large diameter portion 15 is provided near the surface portion 14 which is the lowest temperature in the object 6 to be crushed, the expandable crushing agent slurry 9 and the tamping material Since the contact area between the hotbed wire heater 12 and the hotbed wire heater 10 is large, a wider area is heated.
Although the contact area with the center portion 16 is small, the central portion 16 has a high heat storage property, so that the hydration reaction rate of the expandable crushing agent slurry 9 can be increased.

In addition, when the outside air temperature is high, as shown in FIG. 10, the surface temperature of the object 6 to be crushed is the highest, so the large diameter portion 15 is buried in the center and the small diameter portion 13 is buried on the surface. By disposing it near the part 14, it is possible to match the outside temperature more closely and crush it in a short time.

Furthermore, in each of the above embodiments, both the expandable crushing agent slurry section 9 and the tamping material 10 are heated, and in each case, the tamping material hardens faster than the expandable crushing agent. This makes it possible to prevent the expansible crushing agent slurry from spouting out due to heating, so crushing can be accomplished in a shorter time.

Incidentally, as in the case of the third embodiment, it is also possible to energize the tamping material portion and the expandable crushing agent slurry portion from separate power sources using separate hotbed wire heaters.

In this example, the explanation was given using an expansible crushing agent whose main component is CaO, but it is an expansible crushing agent that destroys concrete structures and rocks by utilizing the hydration expansion pressure generated by the reaction with water. Good to have.

In addition, in the above embodiments, the crushing time is adjusted by changing the number and length of the hotbed wire heater. The exothermic temperature may be adjusted by adjusting the crushing time.

Tamping materials also include any hydraulic cement paste, mortar, or concrete. That is, mixed cements such as Portland cement, blast furnace cement, and fly ash cement, ultra-fast hardening cement, alumina cement, quick-setting, quick-hardening cement, plaster plaster, etc. are the targets. Furthermore, in each of the above embodiments, the case where one hotbed wire heater is used to adjust the crushing time arbitrarily was explained as an example, but as shown in FIG. It may be something that is controlled.

Since the present invention has the above configuration,
The progress rate of the hydration reaction of CaO, etc. in the expandable crushing agent can be controlled arbitrarily, and it can be done in an extremely short time (1
It is possible to destroy the object to be crushed within an arbitrary scheduled time period. In addition, in the present invention, instead of installing an electric heater in a steel casing pipe as in the past, the coated heating wire itself is placed in an expandable crushing agent slurry or a tamping material and an expandable crushing agent slurry. Since it is buried so as to be in contact with both parts, it does not become an obstacle to the ripping and dosing work after destruction, and the destruction work can be carried out more smoothly. Furthermore, a steel casing pipe is no longer required, which reduces work costs, and the filling amount of expandable crushing agent slurry is not reduced by inserting a casing pipe as in the past. The object to be crushed can be reliably destroyed. In addition, in the present invention, the development rate of hydration expansion pressure of CaO, etc. in the expandable crushing agent can be arbitrarily and freely controlled, so that the size of the object to be crushed, the hole diameter, the outside air temperature, etc. In preparation for the conditions of
There is no need to prepare in advance various expandable crushing agents with different compounding ratios such as CaO, which reduces the number of products produced, enables high-volume production of a small number of products, significantly lowers production costs, and reduces destruction work. It also has the effect of making it easier.

Furthermore, according to the present invention, not only can the crushing time and crushing effect be freely and arbitrarily controlled, but also the crushing time can be significantly shortened, so that the entire crushing energy of the crushing agent is generated within a short period of time, greatly improving the crushing effect. However, the amount of crushing agent used can be reduced, making it possible to significantly reduce the cost of destroying concrete structures and rocks.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional destructive construction method using an expansive crushing agent, Fig. 2 is an explanatory diagram showing a first embodiment of the destructive construction method according to the present invention, and Fig. 3 is an explanatory diagram showing the current destruction method in the first embodiment. Graph showing the relationship between value and crushing time,
FIG. 4 is a graph showing the relationship between crack width and crushing time in the first embodiment, FIG. 5 is an explanatory diagram showing the second embodiment of the destructive method according to the present invention, and FIG.
A graph showing the relationship between the current value and the crushing time in Examples, FIG. 7 is a graph showing the relationship between the crack width and the crushing time, FIG. 8 is an explanatory diagram showing the third example, and FIG. 9 is a graph showing the relationship between the crack width and the crushing time. An explanatory diagram showing an example, FIG. 10 is the fifth
FIG. 11 is an explanatory diagram showing another embodiment. 6... Object to be crushed, 7... Hole, 8, 11... Hotbed wire heater, 9... Expandable crushing agent slurry, 10...
...Tamping material (ultra-fast hardening cement mortar).

Claims (1)

[Scope of Claims] 1. A hole opened in an object to be crushed in a slurry state by mixing with water an expansive crushing agent that destroys concrete structures, rocks, etc. by utilizing hydration expansion pressure generated by reaction with water. In this method, a covered heating wire is placed in the hole, and the expandable crushing agent slurry is heated to reach the hydration expansion pressure. A destructive construction method characterized by crushing objects to be crushed within an arbitrary time by controlling the timing of occurrence. 2 The heating wires include a first heating wire placed in the tamping material and a second heating wire placed in the expandable crushing agent.
and a heating wire, wherein after the first heating wire is energized to harden the tamping material, the second heating wire is energized to heat the expandable crushing agent. Destructive method described in section. 3. The destructive construction method according to claim 1 or 2, wherein the heating wire is formed in a helical shape with one end having a small diameter and the other end having a large diameter.