JP2007154440A - Concrete chipping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve efficient chipping work by preventing a leakage of insulating water for filling a part for positively causing concrete breaking by high-voltage pulse electric discharge in a method of chipping the surface of a concrete structure. <P>SOLUTION: A cylindrical container installed on the concrete surface interposing a seal member between the lower end peripheral edge and the concrete surface is filled with the insulating water with viscosity imparted by adding a thickener so that a J-funnel flow-down time is 5-15 seconds. Discharge electrodes are erected at a predetermined space, and high-voltage pulse applied to the discharge electrodes is propagated from the concrete surface to the interior to chip the concrete surface between the discharge electrodes in a thin layer state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a concrete suspension device, and more particularly to a concrete suspension device that can efficiently suspend a predetermined range of the surface of existing concrete using high-voltage pulse discharge.

  Conventionally, a rock or concrete crushing method using high-voltage pulse discharge has been proposed (see Patent Document 1). The concrete crushing operation using this type of high-voltage pulse discharge is performed by, for example, bringing a discharge terminal and a ground terminal, which are arranged at a predetermined distance, into contact with a concrete surface covered with an insulating fluid, and then applying a high-voltage pulse to the discharge terminal side. Is applied, and the surface of the concrete in contact with the discharge terminal and the ground terminal is crushed over a predetermined range. The principle of crushing concrete by this high voltage pulse discharge is that water that does not normally act as an insulator but acts as an insulator when a high voltage pulse is applied (hereinafter referred to as a conductor in this specification). However, when the concrete surface is filled with water used as an insulator during high voltage pulse action, it is called “insulating water.” As a result, the discharge passes through the interior of the concrete containing fine air bubbles and the discharge path. It consists of a mechanism in which the inside becomes high-pressure plasma and the concrete is crushed.

  In this specification, for cored crushing operations such as crushing large rocks or concrete into small blocks, the specific range of the concrete surface is a thin layer in the range of several mm to several tens of cm. The work of breaking up into pieces and crushing them off is called "Hatsuri". Therefore, in this specification, it is used almost synonymously, such as crushing, hanging, crushing, hulling.

  As described above, in order to suspend concrete by high voltage pulse discharge crushing using water (insulating water) that can be used as an insulating material at the time of high voltage pulse action, insulation performance of insulating water is sufficiently obtained. It is preferable to cover the concrete surface with a predetermined water depth. Patent Document 2 discloses a technique in which a crushing head having an electrode terminal disposed therein is brought into close contact with the surface of a rock, and an insulating fluid is supplied to the inside through a pump.

JP-A-9-119283. JP-A-11-236793.

  By the way, in patent document 1, it is comprised so that a standing electrode may advance toward the inside of the rock etc. which are crushing objects, using diesel oil, water, seawater, grease, hydraulic oil etc. as an insulating fluid. Yes. Then, the insulating fluid is stored in the crushed space, and continuous crushing work is performed. However, as in Patent Document 2, the insulating fluid is pressurized by using a crushing head and placed in the crushing object. There is a problem that the efficiency of crushing the object to be crushed is poor because the controlled permeation is not taken into consideration.

  On the other hand, in Patent Document 2, by pressurizing the insulating fluid in the crushing head, the insulating fluid is permeated while being controlled to a predetermined depth in the crushing object. For this reason, since a discharge path can be formed in a deep position inside the object to be crushed to generate a crushing surface, an efficient crushing operation is realized.

However, for example, in a hanger operation that hangs a predetermined plane range of the concrete surface at a predetermined depth, the discharge electrode terminal is moved by a predetermined distance in the direction in which the hanger operation is performed. With the supply pipe from the fluid pressurizer connected to the crushing head, the crushing head is brought into close contact with the concrete surface at the moved position, and the operation of pressurizing and supplying the insulating fluid into the crushing head is continued. Must be repeated. For this reason, there has been a problem that the crushing operation is extremely complicated and inefficient.
Further, as the concrete surface lifting operation proceeds, the lower surface of the crushing head may already be pulled and overlapped with the chipped portion of the concrete surface. In this state, a gap is generated between the concrete surface and the crushing head, and an insulator such as water inside flows out.

  In general, the use of water as the insulating fluid is easy and economical at the site where the lifting operation is performed. However, since the concrete surface has subtle irregularities, a slight gap is formed between the above-described crushing head and other lower surfaces, which may cause water leakage. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a concrete suspension device that solves the above-mentioned problems of the prior art and reliably prevents leakage of insulating water due to irregularities on the concrete surface.

  In order to achieve the above object, the present invention fills a cylindrical container placed on a concrete surface with insulating water having viscosity, and stands discharge electrodes at predetermined intervals to give the discharge electrodes. The high voltage pulse is propagated from the concrete surface to the inside, and the concrete surface between the discharge electrodes is suspended in a thin layer.

  At this time, it is preferable to prevent leakage of the insulating water by interposing a sealing member between a lower end periphery of the cylindrical container and the concrete surface.

  The insulating water is preferably added with a thickener to increase the viscosity so that the J funnel flow time is 5 to 15 seconds.

  The seal member includes a hard resin ring member connected to a lower surface periphery of the cylindrical container, and a soft resin ring portion that is formed in a circumferential shape and integrally protrudes from a part of the lower surface of the resin ring member. It is preferable to configure.

  According to the present invention, since the concrete can completely close the gap generated between the lower end of the container of the suspension device and the concrete suspended by the progress of the suspension operation, the leakage of the insulating water having viscosity stored in the container is prevented. There is an effect that it can be surely prevented.

  Hereinafter, the concrete of the present invention will be described with reference to the accompanying drawings as the best mode for carrying out the suspension device.

  FIG. 1 shows an embodiment of a concrete suspension device of the present invention (hereinafter simply referred to as a suspension device 10), and a part of the device is shown in cross section so that the installation state of the discharge electrode in the main body of the suspension device 10 can be understood. It is a schematic whole block diagram shown by. As shown in the figure, the main body portion of the suspension device 10 includes a cylindrical container placed on a concrete surface to be suspended and filled with water 12, and the cylindrical container 11 is illustrated in the figure. It consists of two discharge electrodes 13 held by a support frame that is not, and the discharge electrodes 13 are installed at a distance between terminals that enables high-voltage pulse crushing of the concrete surface 1. In this embodiment, the discharge electrode 13 is composed of a self-supporting rod-like body in which the periphery of a φ5 mm copper wire constituting the terminal tip 13a is insulated and coated with a high-density polyethylene resin coating material 13b. In this embodiment, a known high voltage pulse having a high voltage power source of about 200 kV and 400 kV as a high voltage pulse generation source and a capacitor having a charge capacity that can be applied to the target using the high voltage power source as a predetermined pulse voltage. A generator 5 is used.

  The tips of the two discharge electrodes 13 (the anode electrode terminal 13+ and the cathode electrode terminal 13-) connected to the conductor 6 derived from the known high voltage pulse generator 5 are spaced apart from the concrete surface 1 by a predetermined distance. A high voltage pulse generated at a certain time interval is discharged from the anode terminal 13+ side to the concrete surface 1, and the impulse force generated by conducting the pulse current through the concrete to the cathode terminal 13− side is applied to the concrete. By propagating inward, the concrete surface 1 up to a predetermined width and depth can be peeled and crushed into a thin lump between the two discharge electrodes 13.

  The diameter of the cylindrical container 11 that accommodates the discharge electrode 13 is preferably determined according to the distance L between the discharge electrodes that defines the suspension range, but the height of the container is an insulator for the high voltage pulse. It is preferable to set it to such an extent that a sufficient water depth D can be ensured so that the concrete surface 1 is filled with the insulating water 12, the electric discharge is surely propagated through the concrete, and the concrete portion that becomes the electric discharge path is crushed. Specifically, it is preferable to make the dimensions such that a water depth of about ½ times the distance L between the discharge electrodes 13 can be secured. In addition, in order to minimize the risk of damage due to a shock wave that has propagated in water during crushing, the cylindrical cross-sectional shape is preferably a cylindrical shape having no corners or the like.

  On the other hand, a sealing member is provided at the lower end of the cylindrical container 11 over the entire lower end. As shown in FIG. 1, when the insulating water 12 is stored in the interior, it is important that the sealing member 20 is in close contact with the concrete surface 1 in order to prevent water leakage from the lower end. come. Therefore, the thickness of the cylindrical container 11 is such that it can withstand the above-described shock wave, and its own weight is increased to the extent that the adhesion of the seal member 20 to the concrete is improved by the self-weight action of the entire container. It is also preferable to set to. In addition, in order to improve the adhesion to a concrete surface having an uneven shape, it is possible to cope by using a ring-shaped weight member 16 that weights the cylindrical container 11 from the upper side, as will be described later with reference to FIG. It is.

  In this embodiment, a silicone resin is used as the sealing member 20 as an elastic molding member having a material that can be deformed following the unevenness of the concrete surface 1. For example, a non-vulcanized butyl rubber that exhibits self-adhesiveness is used. Use various materials capable of closing the gap between the cylindrical container 11 and the concavo-convex concrete surface 1 such as soft synthetic rubber, various soft rubber elastomers, urethane elastomers, gel-like soft urethane resins, etc. Can do.

  In addition, a water supply pipe 3 is provided in the cylindrical container 11, and the insulating water 12 stored in the external water storage container is moved into the cylindrical container 11 by the operation of the external pump P prior to the crushing operation. Supplied to a predetermined depth. After the crushing operation, the insulating water 12 mixed with the concrete crushed pieces in the cylindrical container 11 is returned to the external water storage container 4 again. The concrete fragments are preferably removed with a filter (not shown) provided in the middle of the circulating water path.

  The insulating water 12 stored in the cylindrical container 11 is based on normal tap water, and a predetermined proportion of a thickening agent is added to slightly increase the viscosity of the insulating water 12 (hereinafter referred to as this water). Is called viscous water 12). As a result, the amount of the viscous water 12 flowing out from the gap between the lower end of the cylindrical container 11 contacting the concrete surface 1 and the suspension surface can be reduced. In the present embodiment, the viscous water 12 is preferably produced by adding about 0.5 to 5.0% by mass of a thickener to tap water. The quality control of the viscous water 12 is preferably performed using the J funnel flow time as will be described later. The viscosity of the viscous water 12 is preferably large from the viewpoint of preventing outflow from the gap in the lower part of the stored cylindrical container 11. However, if the viscosity is high, the load on the pump used increases and the viscosity of the viscous water 12 is increased. Since it takes a lot of time to remove the suspended concrete pieces, it is preferable to have a viscosity that can be accommodated within the flow time of the J funnel. Specifically, about 5 to 15 seconds is appropriate for the flow time of the J funnel, and about 5 to 10 seconds is appropriate particularly when post-treatment is considered. In addition, as a water, if it does not inhibit the viscosity display of a thickener, a rock spring, an in-situ pumping, etc. can be used suitably.

  As the thickener, a cellulose-based water-soluble polymer, an acrylic polymer, a vegetable polymer material, and the like that are easily dissolved by adding to the tap water used are suitable. Needless to say, normal tap water can be used without adding a thickener, as long as the concrete surface 1 is smooth and the water-tightness of the seal member 20 can be sufficiently secured.

  Next, the weight member 16 as the weight ring in FIG. 2 will be briefly described. As shown in FIG. 1, when the concrete surface 1 is continuously lifted after the process shown in FIG. 1, the concrete in which a part of the lower end of the cylindrical container 11 is held is shown in FIG. May be located on part of the surface 1. If the concrete surface 1 is substantially horizontal as shown in FIG. 1, the sealing member 20 is in close contact with the concrete surface 1 due to the weight of the cylindrical container 11 and there is no fear of water leakage, but as shown in FIG. In addition, the crushed surface of mortar and aggregate, the location where the aggregate has fallen, and the like appear on the surface where the concrete is crushed. For this reason, it is important that the sealing member 20 is firmly attached to the concrete surface 1 after the suspension. Therefore, in the process shown in FIG. 2, a weight ring is placed on the upper part of the cylindrical container 11, the pressing force from above is increased, and the seal member 20 is sufficiently deformed to the concrete surface 1 after the suspension. The resulting uneven surface is in close contact. In this embodiment, the steel weight 16 is used as the weighting ring, but the cylindrical container 11 is made of concrete using a tension member such as a wire using an anchor portion (not shown) provided on the concrete surface 1. It is also possible to press the surface side.

[Modification of seal member]
Although the above-described seal member 20 is an example in which a molded member made of a single ring-shaped material equal to the diameter of the cylindrical container 11 is used, a modification example in which the seal member 20 is composed of two types of members is illustrated. 3 to 5 will be described.
In the present modification, as shown in FIG. 3, a first ring-shaped seal member 21 made of hard resin is provided over the entire lower end of the cylindrical container 11, and the lower surface of the first ring-shaped seal member 21 is provided. The second ring-shaped sealing member 22 made of a soft resin is provided in a double manner. FIG. 3 is a cross-sectional view showing the entire cylindrical container 11 provided with the double structure sealing member 20 (21, 22). Enlarged views of the seal member 20 in FIG. 5 are shown in FIGS. As is apparent from each drawing of FIG. 5, the initial shape before the cylindrical container 11 is placed on the concrete surface 1 is the shape shown in FIG. When the cylindrical container 11 is set on the smooth concrete surface 1 as shown in FIG. 3, as shown in FIG. While being deformed by its own weight, the softer second seal member 22 is completely deformed into a flat shape and is in close contact with the concrete surface 1. Next, as shown in FIG. 4, when the cylindrical container 11 is placed on the surface of the suspended concrete, the shape of the seal member 20 is the first as shown in FIGS. 5 (c) and 5 (d). The seal member 21 is deformed following the shape of the concrete while maintaining a substantially rectangular cross section following the large depression 1a, and the second seal member 22 at the tip is pressed so as to bite into the fine uneven surface of the concrete surface 1. As shown in FIG. 4, since the cylindrical container 11 is applied to a part of the concrete recessed by the suspending operation, the container 11 itself is slightly inclined, but the bottom surface of the cylindrical container 11 is surely the concrete surface 1. The viscous water 12 that is in close contact with the water and is stored in the cylindrical container 11 later does not leak from between the bottom surface and the concrete surface 1.

  FIG. 6 is an explanatory view showing another embodiment in which the lifting device 10 is applied to the lifting work of the concrete wall surface 7. As shown in the figure, the cylindrical container 11 has a water-tight removable lid 15 for storing viscous water 12 therein. And the cylindrical container 11 covered with this cover part 15 is hold | maintained at the anchor part 9 constructed in the concrete wall surface 7 via the fixed band 8. FIG. At this time, in order to fill the inside with the viscous water 12, a water supply pipe 3 is connected to the upper part of the container, and the same external pump P and external water storage container 4 as those in FIG. In this embodiment, the cylindrical container 11 is fixed by a fixing band. However, as another fixing mechanism for fixing the cylindrical container 11 to the wall surface, for example, as a boom tip attachment of a heavy machine capable of performing various operations by boom operation. It is also possible to provide a gantry on which the cylindrical container 11 is mounted and to arrange the cylindrical container 11 on the gantry on the target concrete wall surface 7 with an appropriate pressing force by a boom operation.

The concrete of this invention is the partial cross section figure which showed the whole structure of the fishing device. The partial cross section figure which showed the example of the installation state of the suspension apparatus shown in FIG. The fragmentary sectional view explaining the sealing state of the cylindrical container bottom part by other Examples of a sealing member. The fragmentary sectional view explaining the sealing state of the cylindrical container bottom part by other Examples of a sealing member. FIG. 5 is an enlarged explanatory view showing a deformed state of the seal member shown in FIGS. 3 and 4. Explanatory drawing which showed the example which applied the suspension apparatus to the concrete wall surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete surface 5 High voltage pulse generation device 7 Concrete wall surface 10 Hanging device 11 Cylindrical container 12 Insulating water (viscous water)
13 Discharge electrode 20 Seal member

Claims (4)

  Fill the cylindrical container installed on the concrete surface with insulating water that has been given viscosity, set up the discharge electrode at a predetermined interval, and generate high voltage pulses applied to the discharge electrode from the concrete surface. The concrete suspension device is characterized in that the concrete surface between the discharge electrodes is suspended in a thin layer.   The concrete suspension device according to claim 1, wherein a sealing member is interposed between a lower end periphery of the cylindrical container and the concrete surface to prevent leakage of the insulating water.   The concrete suspension device according to claim 1, wherein the insulating water is increased in viscosity by adding a thickener so that a J funnel flow time is 5 to 15 seconds.   The seal member includes a hard resin ring member connected to a lower surface periphery of the cylindrical container, and a soft resin ring portion that is formed in a circumferential shape and integrally protrudes from a part of the lower surface of the resin ring member. The concrete suspending apparatus according to claim 1, wherein

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