JPS60238572A - Disassembling of mass concrete - 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 method for dismantling mass concrete of dams, reactor vessel foundations, shielding walls, etc. of nuclear power plants.

Conventionally, there are many methods for demolition of so-called mass concrete with a large cross section, such as explosive crushing, mechanical crushing using hydraulic pressure or breakers, fire crushing, crushing using sonic electromagnetic waves or electric force, and crushing using high-pressure water jets. It is used.

However, the above-mentioned construction methods cannot be applied to any location or structure without problems; a construction method that is suitable for the condition of the object to be demolished is to be adopted.

The demolition method according to the present invention removes dangerous concrete structures, such as dams and nuclear power plant structures, that are difficult for workers to approach during demolition, and that restricts working close to the structures. It concerns a method of demolition that is suitable, safe, and accurate.

The method according to the first invention involves installing a hanging hook at the center of each top of the block to be dismantled, grinding with a high-pressure water jet on the line to be cut, and grinding while guiding a cutting device that sprays an abrasive material. Attach a guide jig to prevent material from dispersing.
First, a predetermined bottom line of the block to be dismantled is cut horizontally to a predetermined depth of 1, and then a predetermined interval is set so that the cut surfaces in two directions are orthogonal to each other, and the parallel vertical cutting lines are guided as described above. This is a mass concrete dismantling method that involves sequentially repeating the steps of cutting both sides along a jig, dismantling the block, and suspending it using a hanging hook.

In the method according to the second invention, a hanging hook is installed at the center of each top of the Glock to be dismantled, and the abrasive material is applied while guiding a cutting device that injects the abrasive material with a high-pressure water jet onto the line to be cut. Attach a guide jig to prevent radiation, and first cut a predetermined bottom line of the block to be dismantled along the guide jig to a predetermined depth in an upward direction on the inner surface, and then cut the block at a predetermined interval in a vertical direction with the cut surfaces parallel to each other. Cut the side surface along the cutting line using the guide jig, then cut the back surface in a vertical direction perpendicular to the cut surface of the side surface at a predetermined depth width, disassemble the block, and use the hanging hook to cut the back surface. This is a method for dismantling mass concrete by sequentially repeating the process of moving suspension supports, and embodiments of the present invention will be explained below with reference to the drawings. Figure 1 shows the cutting device used in the inventions of No. 1 and No. 2. 40. In this figure, 1 is a hydraulic pressure generating device, and the hydraulic pressure generated here is applied by alternately applying hydraulic pressure to circuits 3 and 4 by a hydraulic directional control valve 2. Pressure booster 5
It gives reciprocating motion to the hydraulic piston 6 inside. 7 is a water supply pump, and water is supplied through two check valves 8, which are arranged in series.
Pressure intensifier 5 is connected via reciprocating movement of hydraulic piston/6 via 8'.
In this pressure intensifier 5, the cross-sectional area of the hydraulic piston 6 and the pump chamber 9.9'
The pressure on the water supply side is increased in inverse proportion to the ratio of the cross-sectional areas on the side.
In response to the reciprocating movement of the hydraulic piston 6, the pump chambers 9 and 9' alternately repeat suction and compression of the supplied water, and the pressure is increased and the check valve 10
．． 10', high pressure water is sent to the injection nozzle 12 via the accumulator 11 and valve 11'. The accumulator 11 stores high pressure water while absorbing the pressure pulsations of the high pressure water generated. It has the function of sending a stable high-pressure water flow to the injection nozzle 12 without pulsation.

This injection nozzle 12 is provided with an abrasive tank 13 on the side of the nozzle, in which a powdery abrasive material such as slag, iron powder, carborantum powder, etc. is stored, and the abrasive tank 13 is supplied to the injection nozzle 12. be done.

FIG. 2 is a partially cross-sectional perspective view illustrating the structure of the injection nozzle 12. The abrasive material supplied from the abrasive tank 13 is a high-pressure water jet that is injected from the nozzle 14 in the mixing chamber 12'. The liquid is added to and mixed with the water, and is injected from the nozzle tip 15.

Fig. 3 (8), (E shows an example of the guide jigs 16, 16' for cutting the dismantled block; the guide jigs 16, 16'i, is L
There is a long board in the shape of
, 16' are faced to each other with an appropriate gap of i% to guide the injection nozzle 12, and the other side of the L shape is fixed to the mask IJ-to 20 with an adhesive or the like. use. The angle of this L-shaped bend is determined as appropriate depending on the shape of the block to be dismantled and the direction of cutting, and the guide jig on only one side may be used for installation depending on the situation of the cut area. I don't mind if you do that.

Figure 4 is the mask conch of the first invention! J-) 20. In this figure, hanging hooks 21, 21', 21'' are placed near the medium heat at the top of each block based on the division of the concrete flock to be dismantled.
... will be planted and suspended using hanging tools in advance. 22 is a horizontal cutting line of the predetermined bottom surface of the block to be demolished of the mass concrete 20, jl), 23, 23'
, 23″...and 24, 24', 24″...
. . . are vertical cutting lines p which are parallel to each other at a predetermined interval, and guide jigs 16 to 116' are fixed to each cutting line with an adhesive or the like prior to the cutting operation.

First, operate the cutting device (not shown) as shown by the arrow 25 along the horizontal cutting line 22 provided at a predetermined height that will be the bottom surface of the dismantled blocks 20a, 20b... , a horizontal cut 90 to a predetermined depth 22' is then made by a cutting device (not shown) in two directions 26, 26' along a vertical cutting line 23. so that the cut surfaces are perpendicular to each other.
24'i Guide jigs 16, 16' are used to completely cut the sides and disassemble the block 2.0a. Furthermore, the cutting line 23'
.

24' and cut vertically in the direction of arrows 26'' and 26'' to break up the flock 20b.

In the same manner, the blocks in the first column are disassembled in the order of 20c, . . . and j. In the case of dismantling the second row, the horizontal cutting line 22' on the bottom surface is further cut at a predetermined length of 22"t, and two cutting devices are used in the same manner as above, and the cutting line 27.27' is then cut. 28, 28'... are sequentially cut and the blocks in the second row are dismantled.The dismantled blocks 20a + 20b... are sequentially attached to the hanging hooks 21.
, 21. '...The kerosene is lifted and transported on reeds at another storage site.

Fig. 5 is an embodiment for explaining the procedure for dismantling mass concrete 2° according to the second invention.
. . 4'11f can be installed and suspended in advance using hanging tools. 22 is a horizontal cutting line of a predetermined bottom surface of a 2° block of mass concrete to be demolished; 29 , 29
', 29''... are vertical cutting lines parallel to each other at predetermined intervals, and 31 are vertical cutting lines 29.29', 29''.・・・
This is the cutting line on the back of the block to be demolished, which is perpendicular to .

Note that guide jigs 16 and 16' are fixed to each cutting line with an adhesive or the like prior to the cutting operation.

First, the blocks to be demolished 30a and 30b.

A cutting device (not shown) is operated along the horizontal cutting line 22 on the bottom surface of the blocks 30c, and a predetermined deep cut 22' is made in the diagonally upward direction on the inner surface of the block as shown by the arrow 25. Then, a cutting device (not shown) is operated to cut in two directions 26,
26', a vertical cutting line 29, 29' is cut along the guide jigs 16, 16' so that the cut surfaces are parallel to each other,
Make the side cuts. Next, the block 30a' (z) is dismantled by cutting the back surface of the block in the vertical direction as shown by the arrow 32 along the cutting line 31 which is orthogonal to the cut surface of the side surface and provided at a predetermined depth width of the block. According to the method, the diblocks 30b, 30c are sequentially cut by cutting the bottom horizontal cutting line 22, the side vertical cutting lines 29", 29"'... and the back cutting line 31. It can be dismantled.In this case, the horizontal cut on the bottom surface is cut diagonally upward toward the inner surface, and by cutting the cut line on the back surface last, It becomes easy to take out the dismantled blocks.

In the first and second inventions described above, a cutting device that injects υ abrasive particles using a high-pressure water jet is used, and a guide jig is used in the cutting line, so that one concrete surface can be On the other hand, even if the angle of the injection nozzle is set arbitrarily, the high aqua regia jet and abrasive particles ejected from the injection nozzle will not be dispersed and will be effectively injected to the cutting part.
It allows cutting work to be performed efficiently, accurately, and safely, and can also easily dismantle mass concrete into prismatic blocks by using multiple cutting devices in combination.○
Furthermore, by applying this dismantling method to cutting equipment equipped with remote control or automatic control equipment, it can be safely and efficiently used for dangerous concrete structures such as toms and nuclear power plants. It can be disassembled.

[Brief explanation of the drawing]

Figure 1 is a block connection diagram showing the configuration of the cutting device.
Figure 2 is a partially cross-sectional perspective view of the injection nozzle, Figure 3 (A)
, '(B) is a perspective view and a sectional view illustrating the guide jig, FIG. 4 is a perspective view showing the disassembly method of the first invention, and FIG. 5 is a perspective view showing the disassembly method of the second invention. be. 1... Hydraulic pressure generator 5... Pressure booster 7... Water supply pump 11... Accumulator 1,1'...
Valve 12... Injection nozzle 13... Abrasive tank 16, 16'... Guide jig 20... Mass concrete 20a, 20b..., 30a. 30b... Demolition block 21.21', 2
1"... Hanging hook 22, 23. 23', 23".
..., 24, 24'. 24″..., 27, 27', 27″..., 2
8.28', 28''... 29.29'..., 31... Cutting line 25.2
6゜26', 26"..., 27.27', 27"...
, 32... Cutting direction 4o... Cutting device Fig. 1 Fig. 2 Fig. 3 (A) Fig. 3 (B) 2 Fig. 4

Claims (2)

[Claims] (1) A hanging hook is installed at the center of each top of the block to be dismantled, and a guide system that prevents the abrasive from dispersing while guiding the cutting device that injects the abrasive with a high-pressure water jet onto the line to be cut. Attach the tool, first cut horizontally to a predetermined depth along a predetermined bottom line of the block to be dismantled, and then cut parallel vertical cutting lines at predetermined intervals so that the cut surfaces in one direction are orthogonal to each other. A method for dismantling mass concrete, in which the entire process of disassembling the block by cutting both sides of the block using the guide jig, and moving the suspension support using a hanging hook is repeated in sequence. (2) A hanging hook is installed at the center of each top of the block to be dismantled, and a guide jig is installed to prevent the abrasive from dispersing while guiding the cutting device that sprays the abrasive with a high-pressure water jet onto the line to be cut. Attachment: First, cut a predetermined bottom line of the block to be dismantled to a predetermined depth along the guide jig in an upward direction on the inner surface, and then cut vertical cutting lines with parallel cut surfaces at predetermined intervals using the guide jig. Step t/11114 of cutting the side surface along the line, then cutting the back side perpendicularly to the cut surface of the side surface at a predetermined depth width, dismantling the block, and moving the block with a hanging hook. A method for repeatedly dismantling mass concrete.