JP2021092138A - Suspension scaffold and installation method thereof - Google Patents

Abstract

To provide a suspension scaffold which can be installed extremely easily regardless of an installation position or a place.SOLUTION: The suspension scaffold comprises a support pole 120 which can be inserted from a ceiling opening 21 of a hollow structure (a boiler 10) and arranged in a vertical direction in the hollow structure (10), a frame 130 movable in a vertical direction along the support pole 120, a beam 140 which is attached to the frame 130 and can extend, shrink and rotate in a plane orthogonal to the support pole 120, a wall pad unit 142 arranged at a tip of the beam 140 for abutting on an inner wall surface 20 W of the hollow structure (10) to support the beam 140, a floor panel 160, 162, 164 mounted to the beam 140 and a handrail 170, 172 mounted to the floor panel 160, 162, 164.SELECTED DRAWING: Figure 19

Description

The present invention relates to a suspended scaffold and its installation method, and is extremely easy to install regardless of the installation position and location, which is particularly suitable for work in a hollow structure such as a boiler or an incinerator. It relates to a suspended scaffold that can be used and how to install it.

When performing repair, inspection, cleaning, maintenance, etc. in various furnaces such as boilers, silos, coke ovens, and incinerators of thermal power plants, it is first necessary to install a scaffold for the work.

For example, Patent Document 1 discloses a technique relating to an in-core scaffold that can be installed along an arbitrary inclination of an inclined pipe at the bottom of a furnace in a boiler.

Further, Patent Document 2 discloses a technique relating to a scaffold support structure capable of deploying internally and installing a suspended scaffold even in a hollow structure in which an opening is formed at a position away from the center of the ceiling portion. ..

Japanese Unexamined Patent Publication No. 7-305497 JP-A-2015-59303

However, the technique disclosed in Patent Document 1 has a problem that the installation location is limited because the installation can be performed only on an arbitrary inclination of the inclined pipe. Further, in the technique disclosed in Patent Document 2, it takes time to assemble the disassembled suspension scaffolding parts in the furnace, and not only cannot it be easily installed, but also in the height direction inside the hollow structure. There is a problem that the scaffold cannot be expanded and contracted in response to a change in the cross-sectional shape.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a suspended scaffold that can be installed extremely easily regardless of the installation position and location, and an installation method thereof.

The present invention includes a support column that can be inserted from the ceiling opening of the hollow structure and is arranged in the vertical direction in the hollow structure, a frame that can move up and down along the support column, and a frame mounted on the frame. A beam that can be expanded and contracted and rotated in a plane orthogonal to the support column, a wall contact unit that is arranged at the tip of the beam and abuts on the inner wall surface of the hollow structure to support the beam, and the above. The problem is solved by a suspended scaffolding provided with a floor panel attached to the beam and a handrail attached to the floor panel.

Here, the beam can be a scissors beam having a bellows structure that can be expanded and contracted.

Further, the floor panel may include a connecting floor panel and a boarding floor panel.

Further, the support column can be added and extended downward.

Further, the support column can be located at a position offset from the center of the suspended scaffold in the expanded state.

Further, an elevating unit for elevating and lowering the frame along the strut is further included, and the elevating unit can be attached to a moving strut that is detachable from the strut so that the frame can be transported by an operator. it can.

The present invention is also a method of installing the suspended scaffold in a hollow structure, in which the support is mounted from the ceiling opening of the hollow structure by using a pedestal above the hollow structure. The step of carrying it into an object, the step of installing a frame on the support column protruding above the hollow structure and mounting the beam in a contracted state, and the step of mounting the beam in a contracted state on the ceiling. A step of inserting through an opening and descending along the support column, a step of extending the beam in the hollow structure to attach a floor panel, and a step of rotating and extending the beam to make the tip of the beam hollow. A method of installing a suspended scaffold, which comprises a step of contacting the inner wall surface of a structure, a step of attaching a floor panel for boarding to the deployed floor panel, and a step of attaching a handrail to the floor panel. It is to provide.

The present invention is also a method of installing the suspended scaffold in a hollow structure, in which the support is mounted from the ceiling opening of the hollow structure by using a pedestal above the hollow structure. A step of carrying it into an object, a step of installing a frame on the support column protruding above the hollow structure, a step of inserting the frame through the ceiling opening and descending along the support column, and a step after descent. A step of mounting the beam in a contracted state on the frame, a step of extending the beam at a predetermined position in the hollow structure to attach the floor panel, and a step of rotating and extending the beam to extend the tip of the beam. Installation of a suspended scaffold having a step of contacting the inner wall surface of the hollow structure, a step of attaching a floor panel for boarding to the deployed floor panel, and a step of attaching a handrail to the floor panel. It provides a method.

According to the present invention, it is possible to install a suspended scaffold extremely easily regardless of the installation position or location.

A perspective view showing a part of a boiler of a waste incinerator in which an embodiment of the present invention is arranged. A perspective view showing an enlarged view of the configuration near the ceiling opening of the boiler according to the first embodiment of the present invention. An enlarged perspective view of the periphery of the scissors beam of the boiler according to the first embodiment of the present invention. An enlarged perspective view of the periphery of the floor panel of the boiler according to the first embodiment of the present invention. Elevation view showing a configuration example of a scissors unit used in the first embodiment of the present invention. (A) plan view and (B) elevation view showing a configuration example of a wall contact unit for corners used in the first embodiment of the present invention. (A) plan view and (B) elevation view showing a configuration example of a wall contact unit for an intermediate portion used in the first embodiment of the present invention. A flow chart showing a procedure for installing the first embodiment of the present invention in a furnace. Vertical cross-sectional view showing how the columns are assembled in step S2 of the installation procedure. Vertical cross-sectional view showing how the scissors unit on one side is attached to the frame in step S5 of the installation procedure. Vertical cross-sectional view showing how the scissors unit on one side is lowered together with the frame in step S6 of the installation procedure. Top view showing an example of the shape of the ceiling opening seen from the top of the boiler A vertical cross-sectional view showing a state in which the suspension device carriage is moved in step S7 of the installation procedure to secure an opening for the scissors unit on the opposite side. A vertical cross-sectional view showing a state in which the scissors unit on the opposite side is lowered and attached to the opposite side of the frame in step S8 of the installation procedure. A vertical cross-sectional view showing a state before extending the scissors beam in step S10 of the installation procedure. A horizontal cross-sectional view taken along the XVI-XVI line of FIG. 15 showing a state before the extension of the scissors beam and a state after the extension of the scissors beam in step S10 of the installation procedure. Vertical cross-sectional view showing a state in which the scissors beam is expanded to the wall surface in step S11 of the installation procedure. Horizontal cross-sectional view taken along line XVIII-XVIII of FIG. Vertical cross-sectional view showing a state in which the handrail is attached to the floor panel in step S13 of the installation procedure. Horizontal sectional view taken along the line XX-XX of FIG. Perspective view which shows the whole structure of 2nd Embodiment of this invention. Top view showing the main part of the 2nd Embodiment of this invention Elevation view showing the main part of the second embodiment of the present invention Right side view showing a main part of the second embodiment of the present invention. (A) plan view and (B) elevation view showing a configuration example of a wall contact unit for an intermediate portion used in the second embodiment of the present invention. Elevation view showing a mechanism for extending a scissors beam according to a second embodiment of the present invention. A block diagram showing a configuration of a control circuit according to a second embodiment of the present invention. A flow chart showing a procedure for installing the second embodiment of the present invention in a furnace. A perspective view showing a state in which the frame is attached in step S23 of the installation procedure and the elevating unit is attached in step S24 of the installation procedure. Perspective view showing a state in which the elevating unit and the frame are lowered in step S25 of the installation procedure. Perspective view showing a state in which the scissors unit and the wall contact unit are attached in step S26 of the installation procedure. A perspective view showing a state in which the landing panel is attached in step S27 of the installation procedure and the scissors control panel is attached in step S28 of the installation procedure. Perspective view showing a state in which the scissors unit is slightly extended in step S29 of the installation procedure. Perspective view showing a state in which the floor panel is installed and fixed only on one side in step S30 of the installation procedure. A perspective view showing a state in which the scissors unit on one side is extended and the floor panel is fixed in step S31 of the installation procedure. Perspective view showing a state in which the handrail around the floor panel is attached in step S32 of the installation procedure. A perspective view showing a state in which the floor panel near the wall surface is expanded in step S33 of the installation procedure. Perspective view showing a state in which the floor panel on the opposite side is expanded in step S34 of the installation procedure. A perspective view showing a state in which the telescopic floor panel and its handrail are attached in step S35 of the installation procedure. Perspective view showing the whole structure after the completion of the 2nd Embodiment of this invention. A plan view showing how the floor of a suspended scaffold expands in the second embodiment of the present invention. Elevation view showing how the floor of the suspended scaffold spreads in the second embodiment of the present invention. (A) plan view, (B) elevation view and (C) left side view showing a state in which the elevating unit used in the second embodiment of the present invention is mounted on a moving column. Elevation view showing the transport state of the elevating unit used in the second embodiment of the present invention. Elevation view showing how the elevating unit used in the second embodiment of the present invention is attached to a support column and lowered.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the constituent requirements in the embodiments described below include those that can be easily assumed by those skilled in the art, those that are substantially the same, that is, those in a so-called equal range. Further, the components disclosed in the embodiments described below may be appropriately combined or appropriately selected and used.

FIG. 1 shows the overall configuration of the boiler 10 of the waste incinerator to which the suspended scaffold 100 according to the embodiment of the present invention is mounted.

The boiler 10 adjacent to an incinerator (not shown) for recovering heat from the exhaust gas is divided by two deflection portions 12 and 14 that bend the flow path of the exhaust gas, and the first radiating chamber 20 from the upstream side in the exhaust gas flow direction, A second radiation chamber 22 and a convection heat transfer chamber 30 are provided. The exhaust gas introduced from the incinerator is circulated from the lower side to the upper side of the first radiant chamber 20, from the upper side to the lower side of the second radiant chamber 22, and from the lower side to the upper side of the convection heat transfer chamber 30.

The first radiant chamber 20 and the second radiant chamber 22 each include a radiant heat transfer surface that receives radiant heat from exhaust gas and generates steam.

The convection heat transfer chamber 30 includes, for example, a screen tube 32, a horizontal evaporation tube 34, a secondary superheater 36, a primary superheater 38, an economizer 40, and the like from the upstream side in the exhaust gas flow direction. Each of the secondary superheater 36 and the primary superheater 38 includes a heat transfer tube group in which a plurality of heat transfer tubes arranged in the horizontal direction are provided in multiple stages in the height direction, and the heat transfer tube group constitutes a convection heat transfer surface. By exchanging heat with the exhaust gas, steam is generated to further overheat. The screen tube 32 is provided with a heat transfer tube in the shape of a flag so as to cool the exhaust gas introduced into the convection heat transfer chamber 30. The horizontal evaporation pipe 34 is a heat transfer pipe that heats water heated by the economizer 40 to generate steam.

As shown in FIG. 1, the gantry 110 for installing the suspension scaffold 100 according to the present invention is installed above the first radiating chamber 20, for example, the rectangular ceiling opening 21.

As shown in detail in FIGS. 2 and 3, the gantry 110 according to the first embodiment of the present invention is arranged vertically in the first radiation chamber 20 which can be inserted from the ceiling opening 21 of the first radiation chamber 20. A scissors unit 139 having a support column 120 to be installed, a frame 130 that can move up and down along the support column 120, and a scissors beam 140 that is attached to the frame 130 and can be expanded and contracted and rotated in a horizontal plane orthogonal to the support column 120, and scissors. A wall contact unit 142 disposed at the tip of the beam 140 for supporting the scissors beam 140 by abutting the inner wall surface 20W of the first radiation chamber 20 (see, for example, FIGS. 6 and 17) and shown in FIG. The floor panel 160 and the telescopic connecting floor panel (also referred to as the telescopic floor panel) 162 attached to the scissors unit 139, and the handrail 170 and the telescopic connecting floor panel 170 and the telescopic floor panel 162 attached to the floor panel 160 and the connecting (expandable) floor panel 162, respectively. It mainly has a handrail 172 (see FIGS. 19 and 20 below).

As shown in detail in FIG. 5, an electric cylinder motor 141 having a built-in ball screw mechanism is disposed at the base of the scissors beam 140, and is disposed at the base of the scissors beam 140 by the cylinder motor 141. The horizontal length of the scissors beam 140 can be changed by changing the vertical distance between the fixed holder 141F and the movable holder 141M.

Of the wall contact units 142, those arranged at the corners of the installation target (here, the first radiation chamber 20) are shown in FIGS. 6 (A) (plan view) and 6 (B) (elevation view). As shown in detail, for example, rolls 143 and 144 made of elastic bodies and stays 145 that rotatably support rolls 143 and 144, which are arranged in orthogonal directions so as to face the inner wall surface 20W to be installed. It is composed of 146, coil springs 147 and 148 for urging rolls 143 and 144 in the direction of the inner wall surface 20W, posts 149 for supporting stays 145 and 146, and a base 150 for supporting posts 149.

Further, the wall contact unit 142 arranged in the intermediate portion is shown in FIGS. 6 (A) and 6 (B) as shown in detail in FIGS. 7 (A) (plan view) and 7 (B) (elevation view). In the configuration, one of the roll 144, the stay 146, and the coil spring 148 is omitted. The configuration of the wall contact unit 142 is not limited to this, and the holding force can be increased by using rolls 143 and 144 as two stations, for example.

In the following description, the same reference numeral 142 is used for the wall contact unit for the corner portion and the wall contact unit for the intermediate portion in order to avoid complication of the reference numerals.

Hereinafter, the installation procedure will be described with reference to the flowchart shown in FIG.

First, in step S1, the gantry 110 is set on the ceiling opening 21 of the first radiation chamber 20. If the gantry 110 is permanently installed, step S1 is unnecessary.

Next, in step S2, for example, a support column 120 having a unit length of about 1.5 m is carried into the first radiation chamber 20 and assembled. Specifically, the support 120 is set on the electric pinion gear 112 for lowering the support provided on the carriage 111 inside the frame 110. Then, the racks 120R and 120L formed on both side surfaces of the support columns 120 are lowered by the electric pinion gear 112, and the support columns 120 are repeatedly connected to extend downward (see FIG. 9). The dolly 111 used for assembling the support column 120 is disassembled and removed when the support column 120 has a desired length.

Then, the process proceeds to step S3, and the support column 120 is suspended from the suspension device carriage 114 on the gantry 110 via, for example, the suspension device 116 including the gear 117 and the chain 118 (see FIG. 10). Here, the reason why the support column 120 is suspended via the gear 117 and the chain 118 is that the inclination of the support column 120 whose lower end is a free end can be adjusted. It is also possible to suspend the support column 120 by a hand-wound winch and a wire attached to the gantry 110, support the support column suspended by a temporary receiving material hung over the opening, and add the support column.

Next, the process proceeds to step S4, and the scissors beam mounting frame (referred to as the right frame) 130R on one side (right side in the figure) is attached to the support column 120.

Next, the process proceeds to step S5, and the right scissors unit 139R provided with the scissors beam (referred to as the right scissors beam) 140R on one side (right side in the figure) is attached to the right frame 130R. When the frame and the scissors unit elevating device are omitted and the elevating unit connected to the upper part of the frame is provided as in the second embodiment described later, after the elevating unit descends into the furnace, the elevating unit is provided. The frame and all scissors units can be assembled.

Next, the process proceeds to step S6, and the right frame 130R and the right scissors unit 139R are lowered along the support column 120 by the electric pinion gear 148R of the right side scissors unit 139R that meshes with the rack 120R on the right side surface of the support column 120 (see FIG. 11). As in the second embodiment, the elevating unit can be used for elevating and lowering.

Then, in step S7, the suspension device carriage 114 on the gantry 110 is indicated by an arrow in FIG. 13 with respect to the rectangular ceiling opening 21 (see, for example, FIGS. 1 and 2) having a planar shape as illustrated in FIG. As shown by A, it moves to the right side and secures an insertion opening for the left side scissors unit 139L provided with a scissors beam (referred to as a left side scissors beam) 140L on the opposite side (left side in the figure). The suspension device carriage 114 and the electric pinion gear 112 may be omitted, and the gantry 110 may be provided on the rail to move together with the gantry.

Next, the process proceeds to step S8, and the left scissors unit 139L is attached to the left scissor unit 139L mounting frame (referred to as the left frame) 130L on the support column 120, and the electric pinion gear of the left side scissors unit 139L that meshes with the rack 120L on the left side surface of the support column 120. It is lowered along the support column 120 by 148L. Then, the left frame 130L and the right frame 130R are connected (see FIG. 14).

Then, the process proceeds to step S9, and the connected frames 130 are lowered to a predetermined position (height) where the scaffolding is required (see FIG. 15).

Next, the process proceeds to step S10, and the scissors beams 140R and 140L in the contracted state as shown in FIG. 16A are connected to the floor panel 160 and the connecting floor panel 162 by the cylinder motors 141R and 141L mounted on the base thereof. It extends to the position shown in FIG. 16B suitable for mounting. As in the second embodiment, all the scissors units and the control panel can be attached at this timing, and the scissors units can be extended by the electric cylinder attached to the frame.

After the scissors unit is extended, a person descends on the assembly foothold 134 and spreads the fixed-length floor panel 160 and the stretchable connecting floor panel 162.

Next, the process proceeds to step S11, the scissors beams 140R and 140L are further expanded by the cylinder motors 141R and 141L, and the wall contact units 142R and 142L are formed as shown in FIGS. 17 (longitudinal section) and 18 (horizontal section). It is pressed against the inner wall surface 20W of the first radiation chamber 20.

Then, the process proceeds to step S12, and the floor panel 164 for boarding is attached.

Next, the process proceeds to step S13, and as shown in FIGS. 19 (vertical cross section) and 20 (horizontal cross section), handrails 170 and expansion / contraction are performed on the inner and outer circumferences of the floor panel 160, the connecting floor panel 162, and the boarding floor panel 164. Install the handrail 172.

As described above, the work scaffolding can be installed in the furnace by a simple operation.

The dismantling may be performed in the reverse order of the above installation.

In this first embodiment, the support column 120 lowered from the ceiling opening 21 is located at the center of the suspended scaffolding 100 in the expanded state, and the suspended scaffolding 100 suspended from above can be easily balanced. it can.

In many cases, due to the presence of piping or the like, the support column 120 cannot be physically passed through the center of the suspended scaffolding 100 in the expanded state. A second embodiment of the present invention in which the support column 120 is passed through a position deviated from the center of the suspended scaffolding 100 in an extended state, which is suitable for such a case, will be described.

The overall configuration of the second embodiment is shown in FIG. 21, the plan view of the main part is shown in FIG. 22, the elevation view is shown in FIG. 23, and the right side view is shown in FIG. 24. In the figure, 110 is an assembly type pedestal (also referred to as an upper pedestal), 120 is a support column, 130 is a frame serving as a scissors base unit, 139 is a scissors unit, and 230 is a left and right integrated frame 130 unlike the first embodiment. Reference numeral 242 is a wall contact unit, and reference numeral 300 is a scissors control panel.

In the second embodiment, the support column 120 is offset to the lower right side of FIG. 22, the right side of FIG. 23, and the left side of FIG. 24 of the suspended scaffold 100 in the expanded state. Therefore, in the second embodiment, it is necessary to extend the scissors beam 140 while balancing the front, back, left and right.

Therefore, as shown in FIGS. 25 (A) (plan view) and 25 (B) (elevation view), the load cell 244 for detecting the load applied to the roll 143 of the wall contact unit 242 and the coil spring 147 contract. A limit switch 252 is provided to detect that the roll 143 is pulled into the cylinder 246 by a predetermined amount or more by the contact of the tip roll 254 with the inner wall surface 20W. It is also possible to omit the limit switch 252 and stop the limit switch 252 when the load value detected by the load cell 244 is reached.

Further, as illustrated in FIG. 26, an elevating unit 230 provided for elevating and lowering the frame 130 integrated on the left and right, an elevating motor 232, a scissors control panel 300 for extending and controlling the scissors beam 140, and, for example, A touch panel type controller 290 is provided.

As shown in FIG. 27, the scissors control panel 300 includes a PLC (programmable controller) 310 in which the scissors (beam) L movement amount, the scissors (beam) R movement amount, and the movement stop load value are input from the controller 290, and the scissors unit. A servo amplifier 312L for 139L and a servo amplifier 312R for scissors unit 139R are provided.

The outputs of the servo amplifiers 312L and 312R are input to the cylinder motors 141L and 141R of the scissors units 139L and 139R, which are used as servo motors, and the lengths of the scissors beams 140L and 140R are positioned by the encoder outputs of the cylinder motors 141L and 141R, respectively. Feedback is controlled.

The output of the load cells 244L and 244R of the scissors units 139L and 139R is pressure-fed back to the PLC 310, and the extension of the scissors beams 140L and 140R is stopped when the load detected by the load cells 244L and 244R reaches a predetermined value.

Therefore, as shown in FIG. 26, when the tip (lower end in the figure) of the cylinder motor 141 contracts upward, the bellows-shaped scissors beam 140 extends outward due to the movement. Then, when it is detected that the movement amount of the tip of the cylinder motor 141 reaches the set value or the load cell 244 of the wall contact unit 242 reaches the set load value, the movement of the lower end of the cylinder motor 141 is terminated. Further, the operation of the limit switch 252 causes an emergency stop.

In the present embodiment, unlike the first embodiment, as shown in FIG. 26, the floor panel 160 and the handrail 170 thereof are attached before the scissors beam 140 is extended.

The installation procedure of the second embodiment is shown in FIG.

First, in step S21, the gantry (also referred to as the upper gantry) 110 is set above the ceiling opening as in the first embodiment.

Next, in step S22, the support column 120 is carried in and assembled in the same manner as in the first embodiment.

Then, in step S23, as shown in FIG. 29, the frame 130 is attached to the support column 120.

Then, in step S24, as also shown in FIG. 29, the elevating unit 230 is attached to the support column 120 and connected to the power supply and the frame 130.

Then, in step S25, as shown in FIG. 30, the elevating unit 230 and the frame 130 are lowered.

Then, in step S26, as shown in FIG. 31, the scissors unit 139 and the wall contact unit 242 are attached to the frame 130. At this time, the scissors unit 139 can be manually hung from the top using, for example, a rope, and can be received and mounted by a worker waiting at the mounting portion.

Then, in step S27, as shown in FIG. 32, the landing panel 136 instead of the assembly foothold 134 of the first embodiment is attached above the scissors base unit 139B.

Next, in step S28, as also shown in FIG. 32, the scissors control panel 300 is attached to the elevating unit 230, and the wiring to the scissors unit 139 is connected.

Then, the process proceeds to step S29, and as shown in FIG. 33, each scissors unit 139 is slightly extended (for example, about 50 cm) by, for example, a manual operation.

Next, the process proceeds to step S30, and as shown in FIG. 34, the floor panel 160 is installed on the scissors unit 139, and only one side (for example, the lower side in the figure) is fixed with a pin. At this time, the floor panel 160 can be manually hung from the top using, for example, a rope, and can be received and mounted by a worker waiting at the mounting portion.

Then, the process proceeds to step S31, and as shown in FIG. 35, the scissors unit 139R on one side (for example, the right side in the drawing) is extended to fix the floor panel 160.

Then, the process proceeds to step S32, and as shown in FIG. 36, the handrail 170 around the floor panel 160 is attached.

Next, the process proceeds to step S33, and as shown in FIG. 37, for example, the floor panel 160R near the wall surface on the narrow side (on the right side in the figure) is expanded by automatic operation.

After the automatic operation is completed, the process proceeds to step S34, and as shown in FIG. 38, the floor panel 160L near the wall surface on the opposite wide side (left side in the figure) is also expanded by the automatic operation.

Then, the process proceeds to step S35, and as shown in FIG. 39, the telescopic connecting floor panel (also referred to as the telescopic floor panel) 162 and the telescopic handrail 172 are attached and completed.

The overall configuration after completion is shown in FIG.

FIG. 41 (plan view) and FIG. 42 (elevation view) show how the floor of the suspended scaffold 100 spreads in the first radiation chamber 20.

Since the tip and root of the scissors unit 139 serve as a rotation axis, the position of the floor panel 160 is determined by the amount of expansion and contraction of the scissors units 139L and 139R.

Therefore, for example, by finely setting the expansion / contraction amount BLU and BLB of the upper left scissors unit 139LU and the lower left scissors unit 139LB with respect to the position L of the left floor panel 160L, the left floor panel 160L is corrected by the servo control for the movement amount of the cylinder motor 141. Can be moved in parallel. The same applies to the right floor panel 160R.

By aligning the expansion / contraction ratios of the left and right scissors units 139L and 139R, it is possible to control the support columns 120 so that they do not tilt too much. If the inclination of the support column 120 does not matter, the load cell 244 and the limit switch 252 can be omitted also in the second embodiment.

Further, in the second embodiment, for moving the elevating unit 230 as shown in FIGS. 43 (A) (plan view), FIG. 43 (B) (elevation view) and FIG. 43 (C) (left side view). A support column 122 is provided so that the operator can move the elevating unit 230.

That is, the triangular bottom frame 124 provided on the moving support column 122 is provided with wheels 126 so that one worker can convey the elevating unit 230 by himself / herself, as shown in FIG. 44. As a result, the worker can easily and quickly move the elevating unit 230.

When the elevating unit 230 is mounted on the support column 120, the moving support column 122 is placed on the support column 120 as shown in FIG. 45 (A) and connected as shown in FIG. 45 (B). As shown in the above, the elevating unit 230 can descend along the support column 120.

As described above, in the above-described embodiment, the support column is inserted through the small opening in the center of the upper part, the floating scaffolding is put out on the support column and put into the furnace, and the structure is expanded and contracted like a magic hand. It is also possible to handle the inside of the boiler. Further, since the scaffolding members are divided, it is possible to carry in even if the ceiling opening of the hollow structure is small. Further, since the extendable beam (scaffold unit in the embodiment) constituting the scaffolding member in the hollow structure rotates and expands and contracts in the horizontal plane to expand the scaffolding, it is extremely easy regardless of the installation position or location. It can be installed. In addition, the horizontal cross-sectional shape of the hollow structure is not limited to a circular shape, and the moments applied to the four corners are large. It is lightweight and can secure sufficient strength without doing so. Further, by combining the expansion and contraction with the rotation, it is possible to secure the light weight and the strength.

In the above embodiment, since the scissors beam 140 is used as the stretchable beam, it is possible to provide light weight and high strength. The type of beam is not limited to this.

Further, in the above-described embodiment, since the support column 120 is suspended by using the suspension device 116 composed of the gear 117 and the chain 118, the inclination of the support column 120 can be easily adjusted. The configuration of the hanging device 116 is not limited to this.

Further, in the above-described embodiment, the wall contact units 142 and 242 are configured by using a single roll, so that the configuration is simple. It should be noted that the holding power can be increased by using, for example, two rolls.

Further, in the above embodiment, since the scissors beam 140 is moved up and down by the rack and pinion mechanism, the work becomes easy. It is also possible to suspend the scissors beam 140 and fix it to the frame 130 by using a cargo handling device such as a hoist.

Further, in the above embodiment, the case where the present invention is applied to the first radiation chamber of the boiler of the waste incinerator has been described, but the application target of the present invention is not limited to this, and the second radiation of the boiler is not limited to this. It can be applied to rooms, silos, coke ovens, and incinerators in general.

10 ... Boiler 20 ... First radiation chamber 20W ... Inner wall surface 21 ... Ceiling opening 100 ... Suspended scaffold 110 ... Stand 111 ... Cart 112, 148R, 148L ... Electric pinion gear 114 ... Hanging device Cart 116 ... Hanging device 117 ... Gear 118 ... Chain 120 ... Support 120R, 120L ... Rack 122 ... Moving support 124 ... Bottom frame 126 ... Wheels 130, 130R, 130L ... Frame 136 ... Landing panel 139 ... Landing panel 139 ... 139R (U), 139R (B), 139L (U) ), 139L (B) ... Scissors unit 140, 140R, 140L ... Scissors beam 141, 141R, 141L ... Cylinder motor 141F ... Fixed holder 141M ... Movable holder 142, 142R, 142L, 242 ... Wall contact unit 143, 144, 254 ... Roll 145, 146 ... Stay 147, 148 ... Coil spring 149 ... Post 150 ... Base 160, 160R, 160L ... Floor panel 162 ... Connecting (expandable) floor panel 164 ... Boarding floor panel 170 ... Handrail 172 ... Telescopic handrail 230 ... Elevating unit 244, 244R, 244L ... Load cell 246 ... Cylinder 252 ... Limit switch 290 ... Controller 300 ... Scissors control panel 310 ... PLC (programmable controller)
312R, 312L ... Servo amplifier

Claims (8)

Supports arranged in the vertical direction in the hollow structure, which can be inserted from the ceiling opening of the hollow structure,
A frame that can move up and down along the columns,
A beam mounted on the frame and expandable / contractible in a plane orthogonal to the support column,
A wall contact unit that is disposed at the tip of the beam and abuts on the inner wall surface of the hollow structure to support the beam.
The floor panel attached to the beam and
The handrail attached to the floor panel and
Suspended scaffolding characterized by being equipped with. The suspended scaffold according to claim 1, wherein the beam is a scaffold beam having a bellows structure that can be expanded and contracted. The suspended scaffold according to claim 1 or 2, wherein the floor panel includes a connecting floor panel and a boarding floor panel. The suspended scaffold according to any one of claims 1 to 3, wherein the support columns are added and extendable downward. The suspended scaffold according to any one of claims 1 to 4, wherein the support column is located at a position offset from the center of the suspended scaffold in the expanded state. An elevating unit for elevating and lowering the frame along the strut is further included, and the elevating unit can be attached to a moving strut that can be attached to and detached from the strut, and can be transported by an operator. The suspended scaffold according to any one of claims 1 to 5. A method of installing the suspended scaffold according to any one of claims 1 to 6 in a hollow structure.
A step of carrying the support column into the hollow structure from the ceiling opening of the hollow structure by using the gantry above the hollow structure.
A step of installing the frame on the support column protruding above the hollow structure and mounting the beam in a contracted state, and
A step of inserting a frame equipped with the beam in a contracted state through the ceiling opening and descending along the support column,
A step of extending the beam in the hollow structure to attach a floor panel,
A step of bringing the tip of the beam into contact with the inner wall surface of the hollow structure by rotating and extending the beam.
Steps to attach the floor panel for boarding to the deployed floor panel,
The step of attaching the handrail to the floor panel,
A method of installing a suspended scaffold, which is characterized by having. A method of installing the suspended scaffold according to any one of claims 1 to 6 in a hollow structure.
A step of carrying the support column into the hollow structure from the ceiling opening of the hollow structure by using the gantry above the hollow structure.
A step of installing a frame on the support column protruding above the hollow structure, and
A step of inserting the frame through the ceiling opening and descending along the support column,
The step of mounting the beam in a contracted state on the frame after descent, and
A step of extending the beam at a predetermined position in the hollow structure to attach a floor panel,
A step of bringing the tip of the beam into contact with the inner wall surface of the hollow structure by rotating and extending the beam.
Steps to attach the floor panel for boarding to the deployed floor panel,
The step of attaching the handrail to the floor panel,
A method of installing a suspended scaffold, which is characterized by having.

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