JP5623713B2 - Method of demolishing a building contaminated with PCB - Google Patents

Description

The present invention relates to a method for dismantling the thus contaminated building PC B.

  PCB processing facilities have been constructed throughout the country, but legally it will operate until seven years later. Demolition of this PCB processing facility is scheduled after that. Therefore, for the time being, the dismantling work of the PCB processing facility has no track record.

  However, when dismantling a processing facility contaminated with PCB, if the walls and ceiling of the building are dismantled, the entire amount of dismantled walls and ceiling will become PCB contaminants, and the cost required for the detoxification process will be significant. Will be bulky.

  On the other hand, in the dismantling of asbestos incineration facility or garbage incineration facility, the contaminated part can be washed with water, but in the case of a PCB processing facility, water cannot be used, and it is a dry treatment.

  On the other hand, heat insulation materials used in buildings, structures, etc. are collected by suction-type collection, and the wind used for suction is discharged as filtered clean air by passing through a bag filter, and collected waste heat insulation materials Has proposed a waste heat insulating material recovery device that is directly stored in a recovery bag from a separation unit (see, for example, Patent Document 1). However, in a bag filter, waste gas containing PCB gas can be cleaned. Can not.

  Therefore, it is not suitable for dismantling the PCB processing facility. Moreover, this patent document does not disclose a chiseling tool or the like for stripping off the contaminated surface of the wall or ceiling of a PCB processing facility.

JP 2004-321984 A

  The present invention has been made to solve the above-described problems, and its purpose is to reduce the volume of PCB contaminants accompanying dismantling when dismantling a treatment facility contaminated with PCBs and other harmful substances. It is in.

The invention according to claim 1 is a method of dismantling a building of a PCB processing facility contaminated with PCB , covering the building with a green house and dividing the inside of the building into a management area level 2 and covering the building The inside of the green house was classified into the management area level 1, and subsequently, the PCB was contaminated with the PCB which peeled off the PCB-contaminated layer of the lightweight foamed concrete panel constituting the building while maintaining the negative pressure in the green house. In the building demolition method, the PCB-contaminated layer of the lightweight foamed concrete panel is peeled off by a flat chisel-shaped cutter having suction means, and the peeled-off PCB contaminated layer is sucked by the suction means, and a cyclone dust collector A cap with a cyclone dust collecting device installed at the upper end of the contaminant collecting drum can And has a cross-sectional inverted U-shaped skirt case, it is characterized in that airtightness of the concave cross-sectional profile of the gasket to provided the contaminant collection drum in the skirt.

  In the present invention, when dismantling a building contaminated with harmful substances, the building is covered with a green house to separate the management area level inside the building from the management area level outside the building, and then the building is configured. Since only the contaminated side surface of the lightweight foamed concrete panel is peeled off, it is possible to greatly reduce the volume of contaminants caused by the dismantled lightweight foamed concrete pieces. For this reason, the expense required for the detoxification process of a contaminant can be suppressed significantly.

  In addition, the present invention strips the contaminated side surface of the lightweight foamed concrete panel constituting the building with the reinforcing bars embedded in the lightweight foamed concrete plate as a mark, so that the building itself is airtight without collapsing. Can be held.

  Further, the present invention provides a suction means for connecting the contaminated side surface of the lightweight foamed concrete panel constituting the building to the collection bag or the collection can with the reinforcing bar embedded in the lightweight foamed concrete plate as a mark. The stripped lightweight foamed concrete pieces to be peeled off using the chipping device provided can be automatically collected in a collection bag or a collection can.

It is a schematic block diagram which shows the demolition method of the building contaminated with the harmful substance concerning this invention. It is a front view of the wall surface which peeled off a part of surface contaminated with the harmful substance. It is XX sectional drawing of FIG. It is a schematic block diagram of the building contaminated with the harmful substance. It is a cross-sectional view of a lightweight foamed concrete panel. It is a schematic block diagram of the chipping device provided with the suction means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The PCB processing facility building 1 is constructed by assembling a rectangular lightweight foam concrete panel (ALC panel) 3 to a steel frame (not shown) constructed on a floor 2 as shown in FIG. Yes. For this reason, the inner surface 6 of the lightweight foamed concrete panel 3 which comprises the side wall 4 and the ceiling 5 of the building 1 is contaminated with PCB.

  The lightweight foamed concrete panel differs in thickness or arrangement of steel reinforcing bars depending on the application. For example, in the case of the lightweight foamed concrete panel 3 having a thickness of 100 mm, as shown in FIG. Reinforcement mats 32 formed by assembling 31 in a lattice shape are embedded in two layers.

  The lightweight foamed concrete panel 3 has a dimension A from the front (inner side) 6 to the nearest first reinforcing bar mat 32a, and a dimension B from the back (outer side) 7 to the nearest second reinforcing bar mat 32b, each 20 mm. The dimension C between the first and second rebar mats 32a and 32b is 60 mm. Further, the first and second reinforcing bar mats 32 a and 32 b are connected by a connecting bar 33. Reference numeral 8 denotes a contaminated layer contaminated with PCB.

  When dismantling a processing facility contaminated with PCB, as shown in FIG. 1, first, the building 1 of the PCB processing facility is covered with a green house 11 larger than the building 1.

  The green house 11 includes a skeleton 12, a curing sheet (for example, a roof blue sheet) 13 that covers the outside of the skeleton 12, and an internal curing sheet (for example, a polysheet) 14 that covers the inside of the skeleton 12. ing.

  The skeleton part 12 is formed in a rectangular tube shape by a large number of work scaffolds 15 assembled so as to surround the periphery of the building 1, and the upper end part 12a is fixed to a plurality of beam members 16 provided so as to be bridged. .

  A suction duct 17 is drawn into the inside of the green house 11 from the outside, and the inside of the green house 11 is decompressed (for example, −2 mmAq to −8 mmAq).

  The management area level of the building 1 is “management area level 2” inside the building 1 and “management area level 1” inside the green house 11. The outside (outside) of the green house 11 is a “non-managed area”.

  When the building is dismantled, a chiseling device 40 provided with a suction device 20 is brought into the building 1 for work. As shown in FIG. 6, the chipping device 40 is configured such that a flat chiseled cutter 41 is detachably attached to the tip of a piston rod 42, and a built-in piston (not shown) is provided in the chipping device main body 43. Is connected to a first high-pressure air supply hose 44 that reciprocates at a high speed (for example, the number of strikes: about 2800 bpm).

  The suction device 20 includes a suction tube 21 and a flexible hose 22, and the flexible hose 22 is connected to a contaminant introduction tube 52 of the cyclone dust collector 50.

  The cyclone dust collector 50 includes an outer cylinder 51, a contaminant introduction pipe 52, an inner cylinder 53, and an exhaust duct 54, and is erected on a cap 55 that is detachably attached to a contaminant collection drum 60. Further, a suction means 58 is provided downstream of the exhaust duct 54 so that the polluted contaminated layer 8 can be sucked. Here, a dust collector (not shown), an exhaust purification device (not shown), and the like may be connected to the exhaust duct 54.

  The cap 55 has a skirt 57 with an inverted U-shaped cross section at the periphery thereof, and the cyclone dust collecting device 50 is made to be contaminated by fitting the skirt 57 to the peripheral edge 61 of the upper end portion of the drum 60 for collecting contaminants. The drum 60 for collection can be detachably mounted.

  Further, the cap 55 is provided with a packing 56 having a concave cross section in the skirt 57 to maintain airtightness with the drum 60 for collecting contaminants. When a fabric collection bag is used instead of the drum can 60, the collection bag needs to be held by a frame body that is substantially the same size as the drum can 60.

  As the chipping device, “Toku Rai Topic Hammer (Chipper) AA-1.3B” manufactured by Toyo Koki Co., Ltd. can be used. In addition to the blower and the ejector, “Business Vacuum Cleaner SVD-3003” manufactured by Suiden Co., Ltd. can be suitably used as the suction means.

  Therefore, when dismantling the processing facility building contaminated with PCB, first, the suction source (not shown) of the suction duct 17 drawn into the inside of the green house 11 is operated to reduce the pressure inside the green house 11 ( For example, −2 mmAq to −8 mmAq).

  Thereafter, as shown in FIG. 1, an operator M wearing protective clothing and protective equipment enters the building 1 to dismantle the building 1. The suction device 58 is operated with the device 40 in hand.

  By clamping the lever 46 provided on the gripping portion 45 of the chipping device 40, high-pressure air a is supplied to the driving unit (piston portion) of the chipping device 40, and the flat chiseled cutter 41 moves back and forth in small increments. The contamination layer 8 on the side surface 4 of the building 1 and the inner surface 6 side of the ceiling 5 contaminated with PCB can be peeled off using a flat chiseled cutter 41.

  At that time, as shown in FIGS. 2 and 3, the reinforcing bar 31 of the first reinforcing bar 32a facing the inner surface 6 of the lightweight foam concrete panel 3 is used as a mark to reinforce the first reinforcing bar mat 32a. Only the inner surface 6 side of the lightweight foamed concrete panel 3 is peeled off until the streaks 31 are exposed.

  For this reason, since most of the lightweight foamed concrete panel 3 including the reinforcing bars 31 remains in the lightweight foamed concrete panel 3, while maintaining the structural strength of the building and maintaining the management zone level at "management zone level 2" The contaminated layer 8 on the inner surface 6 side of the lightweight foamed concrete panel 3 can be peeled off. After stripping off the contaminated layer 8, since there is no contaminant, all work is performed in an atmosphere of “management area level 1”, and the load of the remaining building dismantling work is reduced. Moreover, the amount of contaminants comprising the contaminated layer 8 of the lightweight foamed concrete panel 3 can be greatly reduced.

  On the other hand, if the contaminated layer 8 is not peeled off, the entire building 1 is dismantled as “management area level 2”, the level management is strengthened, and the work load is greatly increased.

  Here, assuming that the thickness of the contaminated layer 8 contaminated with PCB is 20 mm and the thickness of the lightweight foamed concrete panel 3 not contaminated with PCB is 80 mm, the volume of the contaminant is reduced to 1/5.

1 Building 3 Lightweight foam concrete panel 6 Contaminated surface 11 Greenhouse

Claims (1)

A method of dismantling a PCB processing facility building contaminated with PCB , wherein the building is covered with a green house to divide the inside of the building into a management zone level 2 and the inside of the green house covering the building is a management zone level In the method of dismantling a building contaminated with PCB, the light-weight foamed concrete panel constituting the building is stripped off while maintaining the negative pressure in the green house. The PCB contaminated layer of the foamed concrete panel is peeled off by a flat chiseled cutter equipped with a suction means, and the PCB contaminated layer thus peeled off is sucked by the suction means and the inside of the contaminant collection drum equipped with a cyclone dust collecting device is installed. And a cap with the cyclone dust collecting device installed is fitted with an inverted U-shaped cross section that fits into the upper end of the contaminant collecting drum. Together with a cart, disassembling method of building contaminated with PCB, characterized in that to hold the airtightness of the concave cross-sectional profile of the packing and the contaminant collection drum provided within the skirt.

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