JPS6332832B2 - - Google Patents

Description

[Detailed description of the invention]

When destroying brittle objects such as rocks, earth, concrete, etc., the present invention involves drilling a hole of a certain diameter in the brittle object, and then inserting a granular hydrated expandable material with a specific particle size distribution into the hole. The present invention relates to a method for destroying a brittle object, in which the brittle object is destroyed by expansion pressure generated during the filling and hydration process. Conventionally, when attempting to destroy brittle objects such as rocks, earth, or concrete, a hole of a certain diameter is drilled into the brittle object, and a powdered hydrated expandable material is mixed with water during the drilling. The method used was to inject a slurry made from powdered hydration-expandable material and destroy the brittle object by the expansion pressure generated during the hydration process. However, this method of destroying brittle objects by injecting a slurry of powdered hydrated expandable material is difficult to use when the brittle object to be destroyed is in a river or sea, or when spring water occurs in a borehole. The slurry injected during drilling is diluted with water and cannot develop sufficient expansion pressure.
This situation also occurs when water accumulates in the hole due to rain or the like after drilling a hole in a brittle object, and the injected slurry is diluted with water, making it impossible to develop sufficient expansion pressure. Therefore, in order to improve the above-mentioned slurry injection method of powdered hydrated expandable material, a thin polyethylene bag with a diameter slightly larger than the diameter of the drilled hole is inserted into the hole, and then the bag is closed. A slurry of powdered hydrated and expandable material was injected and filled inside, hydrated and expanded to destroy the brittle object. However, these slurry injection methods not only require complicated work, but are also difficult to perform underwater or under the sea. The present invention was made in order to eliminate the above-mentioned disadvantages of conventional methods of destroying brittle objects, and includes:
The object of the present invention is to provide a method for breaking a brittle object that can generate a sufficiently large expansion pressure on a hydrated expandable material during drilling of the brittle object. Further, the present invention aims to provide a method for destroying brittle objects, which can easily destroy brittle objects in rivers or the sea. Furthermore, the present invention provides a brittle object that can effectively destroy the brittle object by sufficiently hydrating and expanding the hydration-expandable material filled in the hole even if water accumulates in the hole due to rain or the like after drilling a brittle object. The aim is to provide a method for destroying the As a result of various experiments to achieve such an objective, the present inventor has found that if the particle size distribution of a powder-like hydration-swellable material is adjusted to have a specific distribution, the powder-like shape The present invention was completed based on the knowledge that an expansion pressure of 2000 t/m ² or more can be developed within 20 hours during the hydration process of an expandable substance. In other words, prepare 10 carbon steel pipes with an inner diameter of 80 mmφ and a length of 550 mm, and attach a pipe to the bottom of each of these steel pipes.
A steel plate with a size of 100 x 100 mm was welded and the bottom was sealed. Next, two paper strain gauges each having a gauge length of 5 mm were attached to the central surface of each steel pipe so as to face each other. Each of the steel pipes completed in this way is placed upright (vertically) in a water tank, and 20°C water is stored in the tank until the top end of the steel pipe is submerged in the water ^. Table 1.
A test example in which Blister powder granules having the (particle size/pore size) shown in the second column were granulated using a pan-type pelletizer so that they had the particle size distribution of the cumulative weight % shown in each row of the third column.
No.1, No.2, No.3,…, No.9, No.10, respectively.
It was filled into separate steel pipes and the change in gauge length was measured after 24 hours at 20°C. When the inflation pressure was converted from the obtained measured values, the values shown in the bottom row of Table 1 were obtained.

[Table] However, 〓-〓 shown in Table-1 indicates that it is not measured.
According to the data shown in Table 1, the cumulative weight percent of particles whose (particle size/pore size) ratio falls within the range belonging to each row of the second column has the particle size distribution shown in Test Examples No. 3 to No. 6. If you use the one adjusted as follows, 20
The hydration expansion pressure after 24 hours at °C is
2150, 2260, 2680, and 2370t/m ² or more, all of which exhibit an expansion pressure of 2000t/m ² or more. On the other hand, those outside the above particle size distribution range are Test Example No. 1,
As shown in No. 2, No. 7 to No. 10, we found that the expansion pressures were all less than 2000 t/m ² and completed the present invention. That is, the method for destroying a brittle object of the present invention involves, after drilling a hole in a brittle object, filling the hole with a hydration-expandable substance, and destroying the brittle object by the pressure generated when the substance hydrates and expands in the presence of water. In the method of breaking brittle objects, as a hydrated expandable substance to be filled into the hole,
A granular material whose cumulative weight % is 0 to 10, and whose particle size ratio (particle size/pore size) to the perforated hole diameter is 1/4 or more, or 1/5.3 or more.
is 0 to 65, cumulative weight% of 1/8 or more granules is 15
~85, Cumulative weight% of granules larger than 1/16 is ~40
95, cumulative weight% of granules of 1/32 or more is 55 to 98,
It is characterized by using a particle size distribution in which the cumulative weight % of 0 or more particulates is 100. The above-mentioned hydrated expandable granules can be granulated using a granulator. When adjusting the above-mentioned granular hydration-swellable material to have the above-mentioned particle size distribution, for example, when molding and granulating it with a granulator such as a pan-shaped pelletizer, the granular hydration-swellable material is generally powdery hydration-swellable material in terms of weight ratio. against sexual substances
Approximately 10 to 18% water is added to form the granules, but in this case it is preferable to use them for destruction as soon as possible after granulation. If filling cannot be performed immediately after granulation, use a hydration reaction inhibitor such as lignin sulfonic acid,
The hydration reaction rate can be adjusted by adjusting the amount of surfactants such as oxycarboxylic acid and alkyl sulfonic acid surfactants. In the present invention, when a granular hydration-expandable material having the above-mentioned particle size distribution is used as the expandable material to be filled into a hole drilled in a brittle object, the amount of voids in the hole can be reduced by the hydration-expandable material. On the other hand, it functions to retain an appropriate amount of moisture, and the fine particles and relatively coarse particles with a predetermined distribution expand appropriately as the hydration reaction progresses, and the resulting expansion pressure destroys the brittle object. It is assumed that Therefore, even if the hole is filled with water, if the granular hydration-expandable material with the above particle size distribution is filled, the water in the hole will overflow and decrease, and after filling is completed, the hole in the hole will be filled with water. The water hydrates the filled inflatable material, and the amount of water becomes adequate to develop the maximum inflation pressure. Furthermore, if water is not present in the drilled hole, or if there is water present but not in sufficient quantity to hydrate the filler, the particulate hydrated expandable material may be used. By injecting water up to the upper end of the hole after filling, a desired inflation pressure can be developed. Next, typical embodiments of the present invention will be described. Example 1 Hole size 80 on a granite bench located 1-1.5m below sea level
Five holes with a length of 2 m and a length of 2 m were drilled at 1.5 m intervals. On the other hand, 16% water was added to Blister powder having a Blaine specific surface area of 2000 cm ² /g, and the mixture was granulated using a pan-type pelletizer to produce granules having the particle size distribution shown in Table 2.

[Table] When this granular material was filled into a hole containing seawater using a tremie tube, the granular material could be filled without being diffused into the water. 24 hours after filling, cracks were found connecting the holes in the granite bench, and the width of the cracks was 5 to 6 mm, and after 36 hours, the width was about 10 mm. Example 2 A hole with a hole diameter of 80 mm and a hole length of 1.5 m was bored in a total of 6 m ² of limestone boulders located on land. On the other hand, water was added to the same blister powder as in Example-1.
16% was added and granulated using a pan-type pelletizer to produce granules having the particle size distribution shown in Table 3 below.

[Table] When this granulated material was filled into the hole and water was injected from the hole opening, a crack with a width of 30 mm occurred 24 hours after injection. Example 3 Three holes with a diameter of 40 mm and a hole length of 1 m were bored at approximately 50 cm intervals in a granite boulder of approximately 2 m ³ located on the riverbed 30 cm below the water surface. On the other hand, 16% water was added to Blaine powder having a specific surface area of 2000 cm ² /g, and the mixture was granulated using a pan-type pelletizer to produce granules having the particle size distribution shown in Table 4 below.

[Table] When this granular material was filled into a borehole in granite that contained river water using a toremi tube, the granular material was able to be filled into the borehole without being diffused into the water. 24 hours after filling, cracks appeared connecting the holes, and the width of the cracks was 7 to 10 mm. As is clear from the above explanation, the destruction method of the present invention can be very effectively applied not only to brittle objects on land, but also to brittle objects in water, under the sea, or from which water springs out during drilling. There are many advantages.

Claims (1)

[Scope of Claims] 1. A method for destroying a brittle object, in which the brittle object is perforated, the perforation is filled with a hydration-expandable substance, and the brittle object is destroyed by the pressure generated when the material hydrates and expands in the presence of water. , the hydration-swellable material to be filled in the perforation is a granular material, and the cumulative weight% of the granular material having a particle size ratio (particle size/pore size) to the perforation hole diameter of 1/4 or more is 0 to 10, 1 The cumulative weight% of granules of /5.3 or more is 0 to 65, the cumulative weight% of granules of 1/8 or more is
15-85, cumulative weight% of granules larger than 1/16 is 40-85
95, cumulative weight% of granules of 1/32 or more is 55 to 98,
A method for breaking a brittle object, characterized by using a particle size distribution in which the cumulative weight % of 0 or more particulates is 100. 2. Claim 1, characterized in that the hydration-swellable granules are granulated using a granulator.
Method for destroying brittle objects as described in section.