JP3895143B2 - Assembly and dismantling method for work lifting scaffolds in tower tanks - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for assembling / disassembling a working lifting scaffold used when checking, repairing, cleaning, and the like in tower tanks.
[0002]
[Prior art]
Tower tanks such as chimneys, evaporators and tanks (hereinafter referred to as tower tanks) are periodically and irregularly stopped for internal inspection, repair, cleaning, etc. After stopping the operation of the towers and tanks and washing the interior with water, assemble a scaffolding inside and inspect, repair, and clean the interior.
[0003]
In general, tower tanks keep the main body airtight, process the fluid, and discharge the system from the top.
[0004]
For example, a continuous evaporator used for cooking kraft pulp is a tower having a height of about 50 m. The above cooking is carried out for several hours at around 170 degrees by adding a cooking solution to wood chips in a pressure-resistant evaporation kettle and blowing heating steam into the upper, middle and lower parts. The wood chip descends while permeating the cooking liquor, and the pulp is recovered from the lower end by blowdown.
[0005]
The evaporating kettle is generally cylindrical in shape and has a smooth inner wall, and a stirring machine or the like is provided at the upper and lower parts of the evaporating kettle to promote reaction or cooking.
[0006]
A stirrer or the like needs to be inspected, repaired, and cleaned regularly or irregularly in order to keep stirring smoothly. In that case, a temporary scaffold is required in the evaporation pot.
[0007]
However, since the evaporating kettle is required to be airtight, there are few entrances into the kettle, and usually, scaffolding materials such as pipes are inserted using about 3 to 4 manholes provided in the axial direction. In addition, the temporary scaffolding is inspected, repaired, and cleaned.
[0008]
Therefore, the work of loading and unloading scaffolding materials in a narrow place is complicated, and it takes time to build a temporary scaffold. Usually, in view of the operation plan of the evaporating kettle, since it cannot be stopped for a long time, there are cases where the inspection date is divided into two or three times per year. Moreover, the temporary construction of the scaffolding up to the upper part is a work at a high place, and skill is required.
[0009]
[Problems to be solved by the invention]
As shown in the evaporating kettle described above, it is generally complicated to assemble and dismantle temporary scaffolds for internal inspection, repair, cleaning, etc. in order to keep the main body airtight and to treat the fluid. Takes time. Therefore, it is easy to cause trouble in the operation of tower tanks. Moreover, the temporary construction of the scaffolding up to the upper part is a work at a high place, and skill is required.
[0010]
Japanese Patent Application Laid-Open No. 8-218620 discloses a scaffold device used when building a tower-like structure such as a chimney. When constructing the above tower-like structure, form a multi-stage formwork to form a frame, cast concrete into it and solidify it, then remove the formwork one after another and stack one block at a time. The building formation work proceeds.
[0011]
That is, a scaffold forming operation for stacking mast blocks constituting a mast on a basic surface, and simultaneously using a scaffold device for performing the chassis forming operation.
[0012]
The scaffold device includes a mast block lifting device, a mast block loading / unloading device, an upper fixed scaffold fixed to the upper end of a mast erected by using the lifting device, and a predetermined interval below the upper fixed scaffold. The fixed lower fixed scaffold, and the movable landing that is arranged to be movable up and down between the upper fixed scaffold and the lower fixed scaffold.
[0013]
However, the scaffold device disclosed in Japanese Patent Application Laid-Open No. 8-218620 is a device that pushes up the mast block using a cylinder, and it is difficult to apply the scaffold device as it is to a lifting scaffold such as inspection of tower tanks.
[0014]
The present invention is intended to solve the above-mentioned problems, drastically reduces work at height, does not swing, is lightweight with a reduced number of parts, and can be quickly assembled and disassembled to shorten the work period. The purpose is to provide a method for assembling and dismantling work scaffolds.
[0015]
[Means for Solving the Problems]
Reference invention 1 is a working lifting scaffold (hereinafter referred to as a lifting scaffold) assembled and dismantled in a tower tank, the lifting scaffold being a work floor temporarily installed in the tower tank, the work An assembly mast composed of an additional mast that is detachably installed on the floor, an elevator stage that moves up and down in the axial direction of the assembly mast, and a drive device that attaches the elevator stage and moves it up and down by a rack and pinion mechanism It is the raising / lowering type | system | group scaffold in the tower tank characterized by comprising the drive frame with which each was equipped, and the control apparatus.
[0016]
The reference invention 2 is characterized in that, in the reference invention 1, the connection of the masts of the collective mast is constituted by a frame that is framed in a triangular shape inside at a predetermined interval.
[0017]
The reference invention 3 is characterized in that, in the reference invention 1, the joining masts of the collective mast are constituted by a frame that is framed in a ring shape outside at a constant interval.
[0018]
The reference invention 4 is characterized in that, in the reference invention 1, 2, or 3, a fixed stage that is assembled and disassembled by an elevating stage is provided at the top of the collective mast.
[0019]
According to the present invention, the above-described work floor, a collective mast composed of an additional mast installed on the work floor, a lift stage that moves up and down in the axial direction of the collective mast, and the lift stage is attached to the rack and pinion type Because it is composed of a drive frame that is equipped with a drive device that moves up and down with a mechanism for each mast, and a control device, it is possible to assemble a lifting scaffold even in tower tanks that can not be connected to the wall It is also possible to assemble the fixed stage assembled by the lifting stage to the top of the collective mast.After the assembly of the lifting scaffold is completed and the work by the lifting scaffold is completed, the fixed stage is moved by the lifting stage. It can be dismantled, the elevating stage can be lowered and added, and the mast can be removed sequentially to dismantle the elevating scaffold.
[0020]
The invention of claim 1 is an assembling / disassembling method for working lifting scaffolds in tower tanks, wherein a mast is removably installed on a work floor temporarily installed in the tower tanks, A drive frame having a drive device having a rack and pinion type lifting mechanism is attached to the additional mast, a lifting stage is attached to the frame via a bracket, and the lifting stage is added by a rack and pinion type lifting mechanism in the axial direction of the mast. The assembly mast of a predetermined height is installed while the mast is raised and the mast is sequentially added, the fixed stage assembled by the elevating stage is attached to the top of the mast, the assembly of the elevating scaffold is completed, and the elevating scaffold After the work is completed, the fixed stage is disassembled by the elevating stage, the elevating stage is lowered and added, the mast is sequentially removed, and the elevating scaffold is disassembled. Which is the assembly and dismantling method of work for elevating scaffold in the tower tank class, characterized.
[0021]
As described above, according to the present invention, even in a tower tank that cannot be connected to the wall, the mast is added and removed while raising and lowering the lifting platform, and the lifting platform is quickly assembled and disassembled. Therefore, it is possible to drastically reduce the work at high places and shorten the overall construction period.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail below with reference to the drawings.
[0023]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged view of a main part indicated by a dotted line P in FIG. 1, and FIG. 3 is a lower work floor as viewed in the direction of arrows AA in FIG. FIG. 4 is a side view showing a state in which the additional mast is attached to the mast base, FIG. 5 is a cross-sectional view taken along line DD of FIG. 4, and FIG. 7 is a plan view showing a mounting state of the additional mast and the drive frame according to FIG. 7, FIG. 7 is a view having a partially cut-out showing the lifting stage as viewed from the line B-B in FIG. 1, and FIG. 8 is a line EE in FIG. FIG. 9 is a view having a partially cutout showing the upper entire floor of the CC line arrow view according to FIG. 1.
[0024]
The case where the working lifting scaffold of the present invention is used in a continuous evaporation pot (hereinafter referred to as an evaporation pot) indicated by a two-dot chain line will be described in detail.
[0025]
The features of the present invention will be described in detail below.
[0026]
As shown in FIG. 1, an elevating scaffold 4 is temporarily installed in the evaporation pot 1. The elevating scaffold 4 includes a work floor 5 installed at the bottom of the evaporating pot 1, a collective mast 16 composed of an additional mast 6 installed on the work floor 5, an elevating stage 7 that moves up and down in the axial direction of the collective mast 16, A driving device 9a for raising and lowering the elevating stage 7 by a rack and pinion type and a control device 9b are added to the driving frame 8 provided for each mast.
[0027]
The elevating scaffold 4 is temporarily installed after the evaporating pot 1 is stopped and the solution to be poured is washed inside with water.
[0028]
The work floor 5, the additional mast 6, the elevating stage 7, and the drive frame 8 including the drive device 9 a and the control device 9 b are all assembled or attached so as to be detachable by bolts and nuts.
[0029]
In temporarily installing the elevating scaffold 4, the work floor 5 is installed at the bottom of the evaporating pot 1.
[0030]
In order to assemble or attach the work floor 5 or the like in the evaporating kettle 1, as shown in FIG. 2, scaffolding materials and the like are carried from a square manhole 3b obtained by improving the existing manhole 3a. Is taken out of there.
[0031]
The lower stirrer 2 provided at the bottom of the evaporating pot 1 is stopped, and the main beam 10 is provided by sewing the space. The main beam 10 is supported by a jack base 11, and an auxiliary beam 12 is provided so as to cross the lower side of the main beam 10. Then, the work floor 5 is installed on the main beam 10. All of these are removably assembled by bolts and nuts.
[0032]
As shown in FIG. 3, the work floor 5 forms a floor surface 5a made of a steel scaffold, and a checker plate 14 is attached to the peripheral end of the floor surface 5a.
[0033]
Further, mast base receiving frames 15a are provided at three locations on the floor surface 5a, and the mast 6 is added to the three mast bases 13 fixed to the main beam 10 via the mast base receiving frames 15a. The splicing mast 6 is disposed so that the line connecting the shaft cores is an equilateral triangle so that a later-described splicing member can be attached.
[0034]
In addition, the code | symbol 15b protrudes a part of existing stirrer 2 by the opening part. Reference numeral 15c denotes a hatch which is an entrance / exit for under-floor inspection.
[0035]
4, 5, and 6, the mast 6 is arranged in a substantially rectangular shape with a gap between four mast members 6 a connected by a reinforcing material 17 to form a mast bone. . The extension mast 6 is attached with a rack 18 constituting a rack and pinion type mechanism.
[0036]
The extension mast 6 has a base plate 20 attached to the lower end and is detachably installed on the mast base 13 with bolts 22. In addition, the guide 19 makes it easy to install the mast 6.
[0037]
Similarly, a base plate 20 is attached to the upper end of the extension mast 6, and the base plate 20 attached to the lower end of the next extension mast 6 is extended by a bolt 22.
[0038]
These addition operations of the addition mast 6 are sequentially repeated to form the addition mast 6 having a predetermined height. The additional mast 6 formed to a predetermined height is handled as a collective mast 16.
[0039]
As shown in FIG. 7, the elevating stage 7 has a drive frame 8 attached so that it can be raised and lowered to each additional mast 6, a bracket 25 attached to each drive frame 8, and a donut shape via the bracket 25. The stage 26 is attached. A handrail 23 is attached to the stage 26 in order to maintain safety. As shown in FIG. 6, the lifting / lowering stage 7 is moved up and down, and the rack 18 constituting the mast 6 and the pinion 27 of the driving frame 8 are engaged with each other, and the driving device 9a is driven to be connected integrally with the driving device 9a. While being controlled by the control device 9b, the rack and pinion mechanism moves up and down while maintaining the horizontal position.
[0040]
At this time, a mast intermediate member 24 is provided between the additional masts 6 so as to be secured so as not to be biased. Therefore, the axial direction side of the drive frame 8 is opened. The opening ratio is set so that the line connecting the axes of the mast 6 becomes an equilateral triangle 21 as indicated by a two-dot chain line.
[0041]
The elevating stage 7 is a work scaffold for performing work such as inspection, repair, and cleaning in the evaporating pot 1, and equipment, tools, and the like necessary for the work are placed together with the worker. Further, materials necessary for assembling the additional mast 6, a material lifting device, and the like are placed on the elevating stage 7, and the additional mast 6 is assembled in the elevating stage 7. The control device 9b is also installed on the lifting stage 7.
[0042]
Therefore, the elevating stage 7 has a size that allows the work to be carried by placing them. However, the shortage can be easily supplemented by repeated ups and downs, but the size of the lifting stage 7 is limited, so for example, the additional mast 6 is about 1.5 m long enough to be carried in and out by hand. The mast member 6a is used.
Further, a handrail 23 is installed around the elevating stage 7 in order to maintain safety.
[0043]
As shown in FIG. 8, the collective mast 16 is provided with a mast intermediate member 24 for securing the additional mast 6 at a predetermined interval so that the elevating stage 7 can be moved up and down smoothly in the axial direction of the mast 6. Provided. The intermediate member 24 has a frame made of an equilateral triangular frame having a size that falls within the equilateral triangle 21 indicated by the two-dot chain line so as not to affect the elevation of the elevating stage 7.
[0044]
Providing the fixed stage on the top of the collective mast 16 is one of the features of the present invention. Here, the upper stage floor 28 is provided on the top of the collective mast 16. The upper entire floor 28 is assembled and disassembled in the elevating stage 7.
[0045]
Next, with reference to FIGS. 1 to 9, the assembly / disassembly method of the working lifting scaffold in the evaporation pot will be described in detail.
[0046]
Scaffolding materials and the like are carried into the evaporating pot 1 through the square manhole 3b, and the work floor 5 is temporarily installed. The work floor 5 is provided with a mast base receiving frame 15a on the floor surface 5a, and the mast base 13 is fixed.
[0047]
The extension mast 6 is detachably installed on the mast base 13 by bolts and nuts 22. A drive frame 8 having a drive device 9 a having a rack and pinion type lifting mechanism and a control device 9 b is attached to the extension mast 6, and the lift stage 7 is attached to the drive frame 8 via a bracket 25.
[0048]
The elevating stage 7 drives a rack and pinion type elevating mechanism to elevate in the axial direction of the additional mast, and installs the collective mast 16 having a predetermined height while sequentially adding the additional mast 6.
[0049]
The elevating stage 7 is lowered to the work floor 5, and the main structure of the upper entire floor 28 is assembled in the elevating stage 7.
[0050]
As shown in FIG. 9, the upper entire floor 28 is roughly divided into a rear assembly portion 30 and a front assembly portion 31 by a skeleton frame 28a. In the rear assembly 30, an assembly mast 16 composed of the additional mast 6 and the intermediate member 24 are arranged.
[0051]
The upper entire floor 28 is mounted on the floor 31 with the steel scaffolding plate 32 and the checker plate 33 is attached to the pre-assembled portion 31 in the ascending / descending stage 7 lowered.
[0052]
Thereafter, the upper entire floor 28 is moved to a position exceeding the top of the collective mast 16 by the ascent of the elevating stage 7. The upper entire floor 28 is positioned at the upper end of each collective mast 16 by moving the fixing frame 34. As a result, the upper entire floor 28 is fixed on the collective mast 16 independently of the elevating stage 7.
[0053]
Thereafter, the hatch 35 provided in the rear assembly portion 30 is opened, and the steel scaffolding plate 29 is carried from there to form the floor surface of the rear assembly portion 30. Thereby, the assembly of the liftable scaffold 4 is completed.
[0054]
After completion of the inspection and the like using the lifting / lowering scaffold 4, the upper entire floor 28 is disassembled in the lifting stage 7 and the upper entire floor 28 is disassembled by a procedure reverse to the assembly procedure. Is lowered, the mast 6 is sequentially removed, and the liftable scaffold 4 is disassembled.
[0055]
As described above, according to the embodiment described above, even in the evaporating pot 1 that cannot be connected to the wall, the connecting mast 6 is connected using the relay member 24 with a simple structure, and the lifting stage 7 is biased. It is possible to carry out the assembly / disassembly work of the lifting / lowering scaffold 4 quickly, easily and safely by carrying a member prepared outside the system into the hook without any need.
[0056]
According to the lifting / lowering scaffold 4, in the evaporating pot 1, the assembling / disassembling work of the lifting / lowering scaffold 4 can be performed within one day, so that the operation of the evaporating pot 1 is not hindered. Also, the temporary construction of the scaffolding up to the top drastically reduces the work at height, and does not require skill.
[0057]
In the above embodiment, the case of the evaporating kettle has been described in detail, but the same effect can be obtained when the lifting and lowering scaffold is assembled and disassembled in other tower tanks.
[0058]
FIG. 10 is a cross-sectional view showing another example of the lifting stage according to the present invention.
[0059]
Portions common to those in FIG. 7 are denoted by the same reference numerals, and a part of the description is omitted.
[0060]
The mounting structure of the lifting / lowering stage 36 is characterized.
[0061]
In order to connect the additional mast 6 constituting the collective mast 16, a ring frame 37 is provided on the outer side of the additional mast 6, and an opening of the drive frame 8 is provided on the outer side of each additional mast 6. Is connected to the ring frame 37.
[0062]
Accordingly, the bracket 39 is provided in the axial direction from the drive frame 8, the ring-shaped stage frame 40 is provided at the tip of the bracket 39, and the stage 40 a, between the mast 6 that is added via the stage frame 40 and the mast 6 is added. 40b is formed.
[0063]
The elevating stage 36 is suitable for assembling and disassembling elevating scaffolds for tower tanks having a small diameter by providing a ring frame 37 on the outside. About an effect, it has the same effect as the raising / lowering stage 4 mentioned above.
[0064]
【The invention's effect】
As described above, the present invention is a work floor temporarily installed in the towers, a collective mast composed of an additional mast that is detachably installed on the work floor, a lifting stage that moves up and down in the axial direction of the collective mast, While installing the lifting stage and driving it up and down with a rack and pinion mechanism, the driving frame provided for each mast and a simple lifting type scaffolding structure composed of a control unit, while raising and lowering the lifting type scaffold, Even when the mast is added and removed, and the walls cannot be connected, the lifting and lowering scaffold can be quickly assembled and disassembled, and the work at a high place can be drastically reduced and the entire construction period can be shortened.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part indicated by a dotted line P in FIG.
FIG. 3 is a view having a partially cutaway showing a lower work floor as viewed in the direction of arrows AA in FIG. 1;
FIG. 4 is a side view showing a state of attachment to a mast base by an additional mast alone.
5 is a cross-sectional view taken along line DD in FIG.
FIG. 6 is a plan view showing an attachment state of an extension mast and a drive frame according to the present invention.
7 is a view having a partially cutaway showing the lifting stage as viewed in the direction of arrows BB according to FIG. 1;
FIG. 8 is a view showing a joint as viewed in the direction of arrows EE according to FIG. 1;
FIG. 9 is a view having a partial cut-out showing the entire upper floor of the line CC in FIG. 1;
FIG. 10 is a cross-sectional view with a partial cutaway showing another embodiment according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Evaporation pot 2 Stirrer etc. 3a Manhole 3b Square type manhole 4 Lifting type scaffold 5 Work floor 5 Floor surface 6 Additional mast 6a Mast member 7 Lifting stage 8 Drive frame 9a Drive unit 9b Control unit 10 Main beam 11 Jack base 12 Auxiliary beam 13 Mast base 14, 33 Checker plate 15a Mast base receiving frame 15b Opening 15c Hatch 16 Collective mast 17 Reinforcement 18 Rack 19 Guide 20 Base plate 21 Eight triangle 22 Bolt 23 Handrail 24 Mast intermediate member 25 Bracket 26 Stage 27 Pinion 28 Upper part Full floor 28a Skeletal frames 29, 32 Steel scaffolding plate 30 Rear assembly 31 Front assembly 34 Fixing frame 35 Hatch 36 Lifting stage (ring frame type)
37 Ring frame 38 Joint member (ring frame type)
39 Bracket (Ring frame type)
40 stage frame 40a, 40b stage

Claims (1)

  It is an assembly and dismantling method for working lifting scaffolds in tower tanks, and a mast is removably installed on the work floor temporarily installed in the tower tanks, and rack and pinion type A drive frame equipped with a drive device having a lift mechanism is attached, a lift stage is attached to the frame via a bracket, the lift stage is added by a rack and pinion type lift mechanism, and is raised in the axial direction of the mast. After installing the assembly mast of a predetermined height while sequentially adding, attaching the fixed stage assembled by the elevating stage to the top of the assembly mast, completing the assembly of the elevating scaffold, and finishing the work by the elevating scaffold, A tower tank characterized in that the fixed stage is disassembled by the elevating stage, the elevating stage is lowered and added, the mast is sequentially removed, and the elevating scaffold is disassembled Assembly and dismantling method of work for elevating scaffold on the inner.

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