JP2004176403A - Lifting/lowering working stage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work platform lifted and lowered along the external wall surface of a chimney by an elevator for safely conducting chimney demolition work efficiently. <P>SOLUTION: In a working floor 11 in which a floor face is constituted by adjusting the overlap quantity of a plurality of step floor members 12 and 13 in response to the diametral change of the chimney 1, a plurality of the working floors 11 are supported at upper ends and arranged at specified intervals along the external wall surface of the chimney in conformity with the external shape of the assembled chimney 1, and unit frames 20 capable of supporting rod expansion/contraction operations of extension jacks 25 by re-piling upper-stage bearing plates 23 and lower-stage bearing plates 24 pushed and fixed to the surface of the external wall surface concrete of the chimney with high friction are used as main structures. Grip jacks 41 and ring chains 45 adjusting a length in the peripheral direction in response to the change of the diameter of the chimney and being capable of adjusting a trace quantity in the peripheral direction for controlling a pushing force against the external wall surface of the chimney of the bearing plates 23 and the bearing plates 24 are mounted among the unit frames 20 and the adjacent unit frames 20. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elevating work stage, which is installed on the outer periphery of a chimney and is used for safely and efficiently performing a chimney dismantling operation of a waste incineration facility, and is mounted along an outer wall surface of the chimney by an equipped elevating device. And a vertically movable work stage.
[0002]
[Prior art]
Based on the Law Concerning Special Measures against Dioxins, which came into effect in 2000, emission standards for dioxins generated from incineration facilities have been strengthened. As a result, remodeling and rebuilding of waste incineration facilities in various parts of the country will be performed in the future, and many facilities are expected to be abolished due to the wide-area plan of waste disposal facilities. Therefore, there is a need for a technology for safely dismantling a waste incineration facility contaminated with harmful substances such as dioxins. In particular, in the dismantling of an aging high-rise chimney, it is important to clean dioxin harmful substances adhering to the inner peripheral surface of the chimney inner cylinder without human intervention and safely dismantle the chimney.
[0003]
The applicant has solved the above-mentioned problems associated with the chimney disassembly technology, that is, a technology that can safely remove harmful substances attached to the chimney when incinerating waste, Has filed a patent application regarding a chimney dismantling system and a dismantling method for a waste incineration facility as a technique for safely and efficiently dismantling and dismantling the dismantled materials (see Japanese Patent Application No. 2001-379205). . Also, as a prior art similar to this application, a work stage connected to a vertical position through a mast having a lifting function is provided, a crushing device is mounted on an upper stage, and dismantling of an aging RC chimney is performed. There is a structure dismantling device that is designed to perform the operation (see Patent Document 1).
[0004]
On the other hand, the shape of the chimney, which is higher than the middle layer, often has a chimney diameter that varies with the height so as to form a tapered shape that becomes thinner toward the upper part. For this reason, a scaffold structure or the like capable of performing a safe operation in accordance with the change in the cross-sectional dimension at the time of dismantling is also required. In particular, since chimney dismantling work is mainly performed in high places, it is required that the work stage is always in contact with the outer wall surface of the chimney and that there is no danger of falling down during the work. As a similar prior art made from such a viewpoint, in a high-rise chimney in which the diameter of the chimney is reduced from the lower part to the upper part, a chimney which is hung from the top of the chimney and is operated using a gondola which is raised and lowered. There is a prior art relating to a work gondola device capable of efficiently performing maintenance of an outer wall (see Patent Document 2). According to the technology of the work gondola device, the work gondola device is suspended adjacently according to a change in a chimney diameter. By expanding and contracting the scaffold between the gondola, the work stage can be arranged without gaps along the outer wall surface of the chimney.
[0005]
[Patent Document 1]
JP-A-11-166315 [Patent Document 2]
JP-A-6-26190
[Problems to be solved by the invention]
By the way, in the dismantling device described in Patent Document 1 described above, a large-scale crushing device such as a hydraulic pressure capable of crushing the RC chimney is mounted on the upper work stage, and other incidental work is also performed on the lower stage. . At this time, the weight and the load of each stage are structured such that a lock pin provided on the work stage side is inserted into a pin hole provided through the wall surface of the chimney to be supported by the chimney. However, since the concrete strength of the chimney that has been exposed to high heat for a long period of time is expected to be weak, such as a decrease in strength, the dismantling device is entirely provided on the work stage as in Patent Document 1. In some cases, a pin hole penetrating through the wall of the chimney may not be able to withstand the load. Therefore, if the number of pin holes is increased, it is necessary to provide a large number of pin holes each time the work stage is moved up and down, and there is a problem that the work stage cannot be continuously moved up and down.
[0007]
Therefore, an object of the present invention is to solve the problems of the above-described conventional technology, and to perform a cleaning operation of pollutants necessary for a chimney dismantling operation, a dismantling of an inner cylinder, and an apparatus necessary for dismantling an outer cylinder concrete. The work stage is greatly reduced in weight by holding the chimney body in a safe state, and the lifting device built into the work stage allows it to be directly supported on the outer wall of the chimney without being affected by the shape of the chimney Another object of the present invention is to provide a work stage that can be continuously moved up and down along the chimney outer wall surface.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a lifting work stage according to the present invention comprises: a work floor portion in which a floor surface is formed by adjusting an overlapping amount of a plurality of step floor members in accordance with a change in diameter of a chimney; While supporting the floor at the upper end, a plurality of bases are arranged at predetermined intervals along the chimney outer wall surface in accordance with the external shape of the chimney to be assembled, and the main structure of the stage is configured. A unit frame that can be moved up and down by supporting the upper and lower supporting plates that are pressed and fixed with high friction to the surface of the chimney outer wall concrete, and that extend and retract, and extend between the adjacent unit frames. It is possible to adjust the circumferential length in accordance with the change in the chimney diameter, and to finely adjust the circumferential length in order to control the pressing force of the upper supporting plate and the lower supporting plate against the chimney outer wall surface. Circumference Characterized by comprising a Mukocho adjustment means.
[0009]
The circumferential length adjusting means includes a hydraulic cylinder jack group connected to form a polygon connecting outer ends of the frame supporting the upper support plate and the lower support plate, respectively, and tensioning via an outer end of the frame. It is preferable to bridge the member.
[0010]
It is preferable that the pressing operation of the upper supporting plate and the lower supporting plate is realized by performing control by simultaneous expansion and contraction operation of the hydraulic cylinder jack and control by adjusting tension of the tension member.
[0011]
It is preferable that a continuous tooth profile is formed on the surface of the face plate of the upper support plate and the lower support plate so as to reliably mesh with concrete.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a lifting work stage of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a state in which a lifting work stage of the present invention is mounted on an outer wall surface of a cylindrical chimney 1 indicated by a virtual line so as to be able to move up and down in a height direction.
The ascending / descending work stage 10 adjusts the overlapping amount of the plurality of step floor members in accordance with the change in the diameter of the chimney 1, and supports the work floor portion 11 having a floor surface and the work floor portion 11 at the upper end. A plurality of units are arranged at predetermined intervals along the outer wall surface of the chimney 1 according to the outer shape of the chimney 1 to be assembled, and constitute a main stage structure, each of which is pressed and fixed to the concrete surface with high friction. A unit frame 20 having an upper stage support plate 23, a lower stage support plate 24, and an elevating mechanism capable of elevating and lowering the entire work stage with a predetermined stroke, and is laterally suspended between adjacent unit frames 20, and corresponds to a change in chimney diameter. A grip jack 4 capable of adjusting the circumferential length and controlling the pressing force of the upper support plate 23 and the lower support plate 24 against the chimney outer wall surface by a small amount in the circumferential direction. And a circumferential length adjusting means 40 for a ring chain 45 and.
[0013]
Hereinafter, each member constituting the lifting and lowering work stage 10 will be described with reference to FIGS. The work floor portion 11 is supported by the upper end of the unit frame 20 and is formed by stacking a lower floor 12A having a long circumferential length and an upper floor 12B having a short circumferential length, each of which has an arc shape in plan view. A movable floor which is rotatably connected to a fixed floor 12 having a layered structure and one end on the outside of the lower floor 12A via a connecting pin 18 and has both ends in the circumferential direction provided between adjacent ends of the unit frame 20. And a floor 13. Since the work stage 10 of the present embodiment has six unit frames 20 (FIG. 4B), the overall plan shape of the work floor 11 is substantially hexagonal with rounded corners. Fixed floors 12 and movable floors 13 are alternately arranged. The material and the material of the work floor are not particularly limited, but a steel or aluminum striped steel plate, an FRP (fiber reinforced resin) molded product or the like is preferable in order to reduce the weight, and the frame is made of expanded metal or punched metal. By attaching a floor material such as a welding wire mesh, the weight can be reduced.
[0014]
When the diameter of the chimney 1 supported by raising the unit frame 20 is reduced, the interval between the adjacent chimneys becomes shorter, and the work floors 11 also approach each other. Therefore, the plane shape is reduced in the order of FIGS. 2 (c), (b) and (a) in accordance with the change of the chimney diameter. The movable floor 13 has a large overlapping portion with the fixed floor 12 as the adjacent fixed floor 12 approaches, and a part of the overlapping portion enters the space between the upper floor 12B and the lower floor 12A of the fixed floor 12, and the floor moves. Surface reduction is achieved. At this time, a skirting member 14 and a handrail unit 17 formed by assembling a support 15 and a handrail 16 are attached to the outer peripheral edge of the lower floor 12A of each fixed floor 12 (see FIG. 1). The handrail unit 17 also overlaps with the adjacent handrail unit as the floor surface is reduced. However, by displacing the mounting position of the adjacent handrail member 16, interference of the handrail member 16 end can be avoided. In the present embodiment, as shown in FIGS. 1 and 2, the movable floor is used to avoid a projecting structure (not shown) such as an elevating ladder provided partially on the outer wall of the chimney 1. 13 has a flap structure 19. Thereby, interference between the projection structure and the work stage 10 can be avoided.
[0015]
The configuration of the unit frame 20 will be described with reference to FIGS.
3 is a side view showing the initial state of the unit frame 20. The unit frame 20 has spreader beams 21 and 22 at its upper and lower ends, and an upper support plate 23 and a lower support plate 24 are fixed to end faces of the spreader beams 21 and 22 on the chimney 1 side. An elevating jack 25 as an elevating mechanism capable of elevating and lowering the entire work stage with a predetermined stroke is provided between the upper and lower spreader beams 21 and 22, and a guide column 26 is provided in parallel with the elevating jack 25. The lower floor 12 </ b> A of the working floor 11 is mounted and fixed on the upper spreader beam 21 via a bundle 27. Since the upper and lower spreader beams 21 and 22 have the same shape and the other components are the same, the configuration will be described below without distinguishing the upper and lower spreader beams.
[0016]
The support plate 23 (24; hereinafter abbreviated) is fixed to the end face of the spreader beam 21 (22; hereinafter abbreviated) on the chimney 1 side. As shown in detail in FIGS. 5 and 6, the support plate 23 is slightly tapered in accordance with the curvature of the outer wall surface of the chimney 1 and has a face plate 28 having a sawtooth shape formed on the surface thereof, and a face plate. And a base plate for holding the base plate 28. The base plate 29 is fixed to the spreader beam 21 so that the upper part is slightly inclined toward the chimney side in accordance with the gradient of the outer wall surface of the chimney 1 in order to increase the bearing effect of the face plate 28 at the time of stop. . In addition, various guide plates 30 are provided on the edge of the base plate 29 as necessary, and a competition between the support plate 23 and concrete which hinders ascending and descending of the stage, structural distortion of the entire stage, the unit frame 20 and the like are performed. It is preferable to prevent occurrence.
[0017]
The support plate 23 is pressed and fixed to the concrete surface with high friction by a grip jack 41 constituting a circumferential length adjusting means 40 described later and a ring chain 45 as a tension member.
[0018]
As shown in FIGS. 4 and 5, the grip jack 41 has a body end 41 a and a rod tip 41 b connected to the outer end position of the spreader beam 21 disposed adjacent to each other via a connection pin 42. A hydraulic cylinder jack erected horizontally in such a manner that the jack length varies between the maximum diameter and the minimum diameter of the chimney 1 (for example, between FIGS. 4A and 4B) by a rod stroke. The dimensions are set so that they can be covered with. The grip jack 41 can detect the extension amount of each rod by an attached sensor (not shown), and the same amount can be simultaneously expanded and contracted by an operation from a hydraulic control unit (not shown) based on the detected value. Operation and expansion and contraction of individual jacks can be performed.
[0019]
In the present embodiment, as shown in FIGS. 1, 3, 4 and 5, the ring chain 45 as a tension member is formed by connecting a steel chain C to each of the spreader beams 21, 21. The chain winders 46 mounted on the specific one spreader beam 21 are located inside the grip jacks 41 installed on the outer end, and are sequentially provided on the outer end of each of the other spreader beams 21. It is stretched so as to form a regular hexagonal shape in plan view via a curved member 47, and the other end is fixed to the outer end of the spreader beam 21 to which the chain winding device 46 is fixed. This ring chain 45 raises the tension of the chain C by operating the hydraulic motor driven chain winding device 46 to wind the chain C. The component force generated at the inflection member 47 toward the center of the chimney 1 causes the spreader to spread. The outer end of the beam 21 is pressed in the direction of the center of the cross section of the chimney 1, and the sawtooth-shaped surface of the face plate 28 of the support plate is cut into the concrete surface of the outer wall surface, whereby the bearing plate is pressed and fixed to the concrete surface with high frictional force. You.
[0020]
The detailed configuration of the ring chain 45 will be described with reference to FIGS. As shown in FIG. 6, the chain winding device 46 is mounted on a lower side of the upper spreader beam 21 and a hydraulic motor 48 is mounted on the upper side of the upper spreader beam 21. And a take-up sprocket 49 to which rotation is imparted via a gear box not provided. Further, as shown in FIG. 5, a start point inflection member 47A is attached to the outer end of the spreader beam 21, while a general inflection member 47B is attached to the outer end of the other spreader beams. Both the start point inflection member 47A and the general inflection member 47B (the upper cover of both members are omitted in FIG. 5 for the sake of explanation) are meshed with the chain C to change the direction of the chain C. The sprocket 50 to be changed is mounted. Further, guide members 51 are attached to the front and rear positions of each sprocket 50. The guide members 51 correct the twist and the like of the chain C, and are guided to the sprocket 50 reliably.
[0021]
As shown in FIG. 5, one end of the chain C is first wound around a winding sprocket 49 of a chain winding device 46, guided from the winding sprocket 49 to a starting point inflection member 47 </ b> A, and installed between the spreader beams 21. 4B, and then bent by a general bending member 47B provided at the outer end of each spreader beam 21 so as to form a polygon in plan view (FIG. 4 (b)). )), And finally returns to the starting point inflection member 47A, and is fixed to the fixed end 52 provided on a part thereof (FIG. 5), thereby constituting the ring chain 45 that makes one round. Although a steel chain is used in the present embodiment, various tension members, such as a steel wire, which are relatively flexible and can be elastically bent into a predetermined polygon and can be restored, may be used. Can be used.
[0022]
In the present embodiment, a hydraulic cylinder jack that can be driven with an extension amount of about 1000 mm per stroke is used as the lifting jack 25 that raises and lowers the entire work stage 10. By controlling the expansion and contraction operation of the lifting jack and the rearrangement operation of the support by the pressing and releasing operations of the support plate 23 in the vertical position described below on the concrete surface, the lifting operation of the entire work stage 10 can be realized. . In order to hold the elevating jack 25 and connect the upper and lower spreader beams 21 and 22 to maintain the rigidity of the unit frame 20, a guide column 26 made of a rectangular steel pipe having a telescopic two-stage spliced elastic portion is arranged in parallel with the elevating jack 25. It is erected. Both the upper and lower ends of the lifting jack 25 and the guide column 26 are pin-connected to the spreader beam via connection pins, and the positional relationship between the upper and lower spreader beams 21 and 22 that changes according to the change in the diameter of the chimney 1. You can follow changes. The lifting jack 25 can detect the extension amount of each rod by an attached sensor (not shown), and simultaneously operate the hydraulic control unit (not shown) based on each detected value to expand and contract the same amount. Operation and expansion and contraction of individual jacks can be performed. In the present invention, the lifting operation and the lowering operation of the entire work stage using the lifting / lowering jacks enable the automatic continuous operation by the control program based on the stroke detection value. The raising and lowering operations by operation and manual operation are also possible by changing the control program. Further, by independently operating each lifting jack, fine adjustment of the installation position can be performed.
[0023]
Referring to FIGS. 7 and 8, a description will be given of an ascending operation procedure when assembling the ascending / descending operation stage 10 of the present invention at the lower portion of the chimney and elevating the same to the upper portion of the chimney.
The lifting work stage 10 is assembled at a height that avoids the lower opening 1A of the chimney 1. Therefore, the assembly scaffold 2 is assembled to a predetermined height, and the stage is assembled on the scaffold (see FIG. 7A). At the stage of assembling the work stage 10, all the hydraulic control pipes 5 and the control wiring 6 are also incorporated. In the present embodiment, the operation control panel 3 and the hydraulic unit 4 that obtain the detection results of jacks, chain tension, and the like, and that simultaneously operate and control each device so that they can be independently switched are installed on the ground. The pipes 5 and the wiring 6 to each device on the work stage 10 are set to a sufficient length even when the work stage 10 rises to the top of the chimney (FIG. 4B). In the case where the above-mentioned scaffold cannot be installed around the bottom of the chimney, a fixing jig may be wound around the chimney outer surface at the position where the work stage is to be installed, or attached to the chimney surface with an anchor bolt or the like. The upper and lower support plates are supported at predetermined positions on the chimney outer wall surface by using the fixing jigs, and the unit lifting frame is assembled on the chimney outer wall surface by assembling each unit frame and grip jack. be able to.
[0024]
The lifting operation procedure by the lifting jack will be described with reference to FIG. For example, in the chimney 1 in which the diameter of the top is reduced as shown in FIG. 7A, the lifting work stage 10 is moved up by the lifting jack 25 and reduced in diameter of the work floor 11 by the grip jack 41. The operation can be realized by a continuous operation. In the basic support state of the lifting and lowering work stage 10, both the supporting plates 23 and 24 at the upper and lower positions are pressed and fixed to the concrete surface with high friction, but in this state, the rod of the grip jack 41 is fully retracted. At the same time, the chain C is sufficiently wound so that the ring chain 45 is also in a tension state. As a result, double safety is secured for the tightening force of the spreader beams 21 and 22 (the force pressing the support plate against the concrete surface). From this state, the hydraulic motor 48 of the upper chain winding device 46 is rotated in the chain unwinding direction to loosen the ring chain 45 (releasing the tension). Next, the rods of the upper six grip jacks 41 are simultaneously slightly extended to release the pressed state of the upper support plate 23 and release the meshing state with the concrete surface. As a result, the upper support plate 23 is completely released from contact with the concrete and becomes free. From this state, the rods of the six lifting jacks 25 are extended by an extension amount for the same stroke, and the upper spreader beam 21 supporting the work floor 11 is elevated by a predetermined elevation amount.
[0025]
When the operation of raising the work floor 11 is completely completed, the rods of the upper six grip jacks 41 are simultaneously slightly retracted to press the upper supporting plate 23 against the concrete surface, and the upper plate 23 of the upper supporting plate 23 is pressed. The saw-tooth shape is meshed with the concrete surface. Further, the ring chain 45 is tensioned by the upper chain winding device 46. Thus, the work stage 10 is supported by the upper support plate 23. In this state, the lower stage ring chain 45 is released, and then the pressing of the lower stage support plate 24 is released, so that the lower stage support plate 24 is in a free state and the rod of the lifting jack 25 in the extended state is retracted. Along with this, the lower spreader beam 22 moves up with the lower support plate 24, and the lifting of one stroke is completed with the rod completely retracted. In the present embodiment, the amount of movement per stroke is about 1 m, and the work stage can be raised by about 1 m by one lifting operation. By repeating this ascending operation, as shown in FIG. 7 (b), it is possible to finally ascend to the top of the chimney. The work can be performed, and when the outer cylinder is dismantled, the work stage can be safely and securely lowered in the reverse order of the flow shown in FIG. 8 as the dismantling work progresses.
[0026]
FIG. 9 is a schematic plan view showing an example of allocating unit frames 20 for applying the lifting work stage 10 of the present invention to chimneys having various cross-sectional shapes. As shown in each figure, in the case of a polygon, since the face plate of the supporting plate is pressed against the outer wall surface of the side, it is not necessary to adopt the face plate shape shown in FIG. 9A and 9B, the rod strokes of the grip jacks are uniform, but in FIG. 9C, the rod strokes of the obliquely arranged grip jacks are larger than the other sides. Since it is necessary to operate, jack operation control suitable for it is performed.
[0027]
In the above description, the work stage provided with the elevating mechanism capable of safely performing high-place work in association with the chimney dismantling work has been described. However, the work stage shown in FIG. It can also be used as a work stage in a construction method in which a precast concrete box is laminated to form a tower-like structure, which is more secured.
[0028]
【The invention's effect】
As described above, according to the elevating work stage of the present invention, the cleaning work of the pollutants necessary for the chimney dismantling work, the dismantling of the inner cylinder, the dismantling of the outer concrete, etc., are safely held in the chimney body, It is possible to provide a work stage that can be lifted and lowered by greatly reducing the weight of the work stage and being directly supported on the outer wall surface of the chimney without being affected by the shape of the chimney.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an embodiment of a lifting work stage according to the present invention.
FIG. 2 is a plan view showing changes in the circumferential direction of a work floor.
FIG. 3 is a side view showing a schematic configuration of a unit frame.
FIG. 4 is a plan view showing changes in circumferential lengths of a grip jack and a ring chain.
FIG. 5 is a partially enlarged plan view showing a configuration of a chain winding device and an inflection member.
FIG. 6 is a partially enlarged side view of the configuration shown in FIG. 5;
FIG. 7 is an explanatory view schematically showing when the ascent / descent work stage is assembled on the ground and when the ascent to the top of the chimney is completed.
FIG. 8 is an operation flowchart showing an ascent / descent step of the elevating jack of the elevating work stage in one stroke.
FIG. 9 is a schematic plan view showing an example of allocating unit frames according to the chimney sectional shape.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chimney 10 Elevating work stage 11 Work floor part 20 Unit frame 21 Upper spreader beam 22 Lower spreader beam 23 Upper support plate 24 Lower support plate 25 Elevating jack 28 Face plate 40 Circumferential length adjusting means 41 Grip jack 45 Ring chain 46 Chain winding Picking device 47 Inflection member C chain

Claims (5)

A work floor section in which a floor surface is formed by adjusting an overlapping amount of a plurality of step floor members in accordance with a change in the diameter of the chimney;
The work floor is supported at the upper end, and a plurality of units are arranged at predetermined intervals along the outer wall surface of the chimney in accordance with the external shape of the chimney to be assembled. A unit frame that can move up and down by supporting the upper and lower support plates that are pressed and fixed with high friction to the chimney outer wall concrete surface,
In order to control the pressing force of the upper support plate and the lower support plate against the outer wall surface of the chimney while adjusting the length in the circumferential direction in accordance with the change in the chimney diameter, being laterally suspended between the adjacent unit frames. A lifting / lowering work stage comprising: a circumferential length adjusting means capable of minutely adjusting a circumferential length. The circumferential length adjusting means includes a hydraulic cylinder jack group connected to form a polygon connecting outer ends of the frame supporting the upper support plate and the lower support plate, respectively. The elevating work stage according to claim 1, wherein the elevating work stage is a stretched tension member. The elevating work stage according to claim 2, wherein the pressing operation of the upper support plate and the lower support plate is controlled by simultaneous expansion and contraction operations of the hydraulic cylinder jacks. The elevating work stage according to claim 2, wherein the pressing operation of the upper support plate and the lower support plate is controlled by adjusting the tension of the tension member. The lifting stage according to claim 1, wherein a continuous tooth profile is formed on a surface of a face plate of the upper support plate and the lower support plate.

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