JPS59228593A - Rapid crushing of concrete and rock - 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 The present invention relates to a rapid crushing method for concrete and rocks using a water-use expanding crushing agent.

Recently, there has been a rapid increase in the demolition of old buildings, underground construction, and construction of expressways due to urban redevelopment. Due to the impact on surrounding residents and the environment, the use of blasting equipment has been severely restricted in these operations, and the crushing of rocks, ores, boulders, etc. is also subject to similar restrictions. For this reason, the process takes a long time,
Sometimes it is impossible to work at all. In particular, blasting cannot be used during expansion work or demolition of nuclear waste power plants.

In the crushing of such concrete structures or rocks, a static crushing method that utilizes the volumetric expansion of quicklime or light calcined dolomite when hydrated has recently been developed, and it is well known that it is showing remarkable power. ). The crushing agent used in this static crushing method is mainly composed of limestone, dolomite, etc., and if necessary, clay, silica stone, iron oxide, etc.
Based on lime or dolomite clinker, which is made by adding 111i or two or more of gypsum, etc., and further adding one or more inorganic or organic substances to adjust the hydration reaction of quicklime and light calcined dolomite. Two or more types are added.

In the method of crushing concrete or rocks using a static crushing agent as described above, first, based on a preliminary investigation of the physical properties of the object to be crushed and the properties of rocks and minerals, it is necessary to determine the appropriate crushing agent for the object to be crushed. Drill with pitch.

Then, during this drilling, 20% of its weight is added to the crushing agent used.
Inject the resulting slurry of crushing agent by adding ~65% water. That is, all conventional construction methods have in common that a slurry of crushing agent is injected during drilling.

As a result of studying the conventional crushing method using slurry injection, the present inventor found that there were various problems as described below. That is, (1) it takes a very long time for cracks to appear in the object to be crushed, (2) the width of the crack is small and short, and (3) the influence of the weather, especially the temperature of the object to be crushed, is large. (4) Slurry often spouts out and is dangerous, etc.

The present invention solves the problems of the conventional methods described above, shortens the time required for cracks to occur in objects to be crushed, and provides a safe rapid crushing method for concrete and rocks that is less affected by temperature. purpose.

The rapid crushing method for concrete and rocks of the present invention involves drilling a predetermined hole in concrete or rock using a drilling machine, filling the hole with Irrigation Expansion 11 crushing agent, and then filling the hole with a crushing agent. Water, steam, or an aqueous solution of salts necessary for the above-mentioned hydration-swellable crushing agent to carry out the water utilization reaction is introduced, and immediately after the introduction, the filling head of the hydration-swellable crushing agent in the borehole is placed at the top of the borehole. It is characterized by applying pressure from the outside using mechanical force via an installed pressure plug. The details of the construction method of the present invention will be explained below using example drawings.

Fig. 1 is a detailed explanatory diagram of the present invention (showing a longitudinal section of the perforation part)
In the figure, R is the rock to be crushed, concrete, etc.
1 is a perforation in the object to be crushed; 2 is a water pipe inserted into the perforation 1 and has a water outflow hole 6 in the pipe body; 4 is a hydration pipe filled in the perforation 1 and around the water pipe 2 Expandable crushing agent (hereinafter simply referred to as crushing agent), 5 is a wedge-shaped pressure plug installed at the top of the borehole 1 (filling head of the crushing agent 4), 6 is a pressure plug 5
This is an inflow path for water, steam, etc., provided inside.

In the construction method of the present invention, first, holes are drilled in the object R at an appropriate pitch based on the results of investigation of various physical properties of the object.

Next, a water guide pipe 2 having holes 3 around the pipe body is inserted into the perforation 1 to introduce water, steam, or an aqueous solution of salts such as calcium chloride necessary for water utilization of the crushing agent.

The outer diameter of the water conduit 2 should be approximately i- of the diameter of the perforation, and its total length is suitably at least μ of the length of the perforation. Also, water absorbent fibers may be inserted instead of the water conduit. Next, around the perforated water pipe 2, a crushing agent 4 made of quicklime or lightly calcined dolomite, which passes through a 1-inch sieve and 50% or more of a 0.495 mm sieve, is applied in a dry state. Fill it so that the volume specific gravity is 1.1 or more. Next, a wedge-shaped steel pressurizer 5 is installed at the top of the hole filled with the crushing agent (above the crushing agent filling head). This wedge-shaped pressurizing plug 5 is provided with an inlet passage 6 for introducing water, steam, or a salt solution into the borehole from the outside.

Next, introduce water, steam, etc. into the hole through the pressure plug,
A hydration reaction is caused in the crushing agent, and at the same time as the reaction starts (immediately after water is added), the pressurizing plug is pressurized from the outside at at least 100 h/m by mechanical force (vibrator, etc.). At this time, pressurization by vibration is very effective. As a result, the volume of the crushing agent rapidly expands at the same time as the hydration of the crushing agent begins, and cracks occur in the object to be crushed in a short period of time. The operating time of the vibrator on the pressurizing frame varies depending on the physical properties of the object to be crushed.
Continue until cracks can be visually confirmed.

Vibration pressurization of the pressurizing plug can also be performed by using a breaker to simultaneously operate the bed sections by one machine. Also, do not introduce water, etc. through the inflow channel in the pressurized orange, but place an ice bag made of vinyl, polyethylene, etc., filled with the required amount of water in advance on the head of the material filled in the perforation, and then close the stopper. Water may be added to the crushing agent by bursting the plastic bag under pressure and releasing the water. In addition, water, salt water, etc. for adding water to the crushing agent may be packed in a bag as described above and placed on top of the bag at the same time as the crushing agent is filled, or may be added in layers alternately with the crushing agent. .

Figure 2 is an explanatory diagram showing the state when adding water using an ice bag. In the figure, 1 to 5 indicate the same things as in Figure 1, and 7
8 is a water bag, and 8 is a vibrator head. Figure (a) shows the state before pressurization by a vibrator, and Figure (b) shows the state after the ice bag is torn and water has been released after processing.

In the above explanation, it has been described that quicklime or lightly calcined dolomite is used as a crushing agent, but it goes without saying that commercially available crushing agents made from conventional quicklime and dolomite-based clinkers can also be used.

According to the construction method of the present invention described above, it is possible to increase the packing density of the crushing agent compared to the conventional slurry one-type method, the water utilization reaction is also faster, and there is also pressurization by external force, so that triple A crushing effect can be expected and the crushing time can be significantly shortened. Furthermore, as a remarkable effect of the construction method of the present invention,
One of the achievements is that we succeeded in completely controlling the gushing phenomenon, which is often seen in conventional slurry-type crushing sites, in a relatively simple manner by using a pressurizing plug.

Next, examples of the construction method of the present invention will be described.

Example 1 Two holes with a hole diameter of 65 am and a hole length of 2 m were drilled at a distance of about 5 m using a crawler at a crushed site where the rock quality was limestone.
There were holes in several places. One hole was filled with a commercially available static crushing agent (Splitter Blue) as a slurry with a water ratio of 60 inches. At this time, the air temperature was 26℃, the water temperature was 18℃, and the rock temperature was 2.
It was 0°C.

As a result, it was confirmed that radial cracks that could be observed with the naked eye occurred 8 hours and 30 minutes after filling the slurry.

At the same time as above, the construction method according to the present invention was implemented. That is, quicklime calcined in a Merz-type vertical furnace with a daily capacity of 150 tons was passed through one sieve in a test mill, and this was prepared as a crushing agent. In addition, as a water conduit, a pipe having 15 outer diameters, 12 inner diameters, and a length of 1.5 m, and having 6 holes of 7 mm diameter at 30 m intervals in the pipe body, was inserted into the perforation. Then, quicklime was sufficiently hardened and filled into the perforation (around the water conduit pipe) using a rod-shaped vibrator. The effective packing density of quicklime at this time was 1.65, and the length of the filled part was 1.75 m.

A polyethylene bag containing water equivalent to 25 centimeters of the quicklime weight is placed on top of the quicklime filling head, a wedge-shaped pressurizing plug is installed on top of the bag (at the top of the perforation), and a breaker is placed on top of the bag to vibrate. Pressurized.

As a result, the pressure stopper was pushed into the hole, and at the same time vibrations were transmitted, and the polyethylene bag was easily ruptured, releasing water, and the quicklime began to hydrate.

As a result of the above work, 1 hour 2 after the start of vibration pressurization of the breaker
Cracks appeared in the crushed body within 5 minutes, and it completely collapsed immediately after that.

Example 2 A concrete specimen with a compressive strength of 32 D llf/d was manufactured. This main body is a cube measuring 1 m x 1 m x 1 m. A hole with a diameter of 65iII+ was drilled in the center, and a vinyl chloride pipe with an outer diameter of 65mm, an inner diameter of 60W, and a length of 750mm was installed inside the hole. In this way, a vinyl chloride pipe was installed in advance in the borehole and used for filling with the crushing agent.

The above specimen was placed in a cold room at 6°C and left for 5 days.

A slurry of a commercially available static crushing agent (Tin Ritter Orange) with a water ratio of 30% was injected into one of the specimens using a conventional construction method. As a result, cracks appeared in 13 hours and 20 minutes.

On the other hand, the construction method of the present invention was applied to another specimen. Quicklime as crushing agent: sand-1: 0.2 (weight)
Filled with. The volume specific gravity was 1.75. A pressure plug was installed at the top of the perforation, and the pressure plug was pressurized with an oil jack. During this time, 1% calcium chloride solution was injected through the pressure plug. As a result, cracks appeared in 2 hours and 45 minutes, and were easily crushed by the operation of the oil jack.

In this way, when holes were made in the object to be crushed in advance, and at low temperatures, cracks were observed to occur and the object could be crushed in a very short period of time (compared to the conventional method).

[Brief explanation of the drawing]

FIG. 1 is a detailed explanatory diagram of the present invention (a vertical cross-sectional view of the perforation part), and FIG. 2 is an explanatory diagram of another embodiment of the construction method of the present invention. R: object to be crushed, 1: perforation, 2: water pipe, 3: outflow hole, 4
: Crushing agent, 5: Pressure plug, 6: Inflow path, 7: Ice bag, 8: Vibrator head. Agent Patent Attorney Sanro Kimura 1st power o1z 5 ↓ 6 ,'Pa, ;;゛ ToR:,', o =';°, Pa:・mi,-: o ;,,,,,,, 2゛・'5. ”:' 4 1.... 2nd:'! , ', 3 (.) JP-A-59-228593 (4) (b)

Claims (1)

[Claims] A predetermined hole is made in advance in concrete or rocks using a drilling machine, and a hydration-swelling crushing agent is filled in the hole, and then the water-swelling crushing agent is poured into the hole in order to carry out the hydration reaction. Water, steam, or an aqueous solution of salts is introduced, and immediately after the introduction, the filling head of the hydration-swellable crushing agent in the borehole is pressurized from the outside using mechanical force via a pressurizing plug installed at the top of the borehole. A rapid crushing method for concrete and rocks.