JP5971807B2 - How to build and use a work scaffold - Google Patents

Description

  The present invention relates to a work scaffold, a construction method thereof, and a use method thereof, and more specifically, a work scaffold used for work in a huge tank that is dangerous for a person to enter, a construction method thereof, and a use method thereof. It is about.

  Conventionally, iron slag discharged from the blast furnace (blast furnace slag) has been disposed of in landfills. However, in recent years, it has been widely used as roadbed materials, ground improvement materials, cement raw materials, concrete aggregates, asphalt mixtures, etc. It's being used. In order to use the blast furnace slag for the above-mentioned use, it is necessary to adjust the particle size to an appropriate particle size according to the use.

  As shown in FIG. 1, the granulated slag produced by the above-described granulation is generally granulated by rapidly cooling the molten slag discharged from the blast furnace with pressure water or running water using a blowing device. After the slag is slurried in the agitation layer, the slurry is pumped together with water by a slurry pump to the dehydration tank for dehydration, then cut out from the lower hopper gate and carried out.

  The agitation tank used for the above-mentioned water granulation treatment usually has a structure consisting of a cylindrical part at the top and a cone-like part with a gradually decreasing cross-sectional dimension. When the slag flows into the tank together with water, it hits the collision plate and scatters and adheres to the inner wall of the stirring tank in large quantities. The adhering granulated slag is removed by the stirring flow of the slurry at the lower part of the stirring tank, but the granulated slag adhering to the upper part of the stirring tank that is not in contact with the stirring flow, particularly the cylindrical part, is It gradually accumulates and its thickness reaches several tens of cm to nearly 1 m. If it becomes such thickness, some of it may be peeled off during operation and fall as a lump, and it may be sucked into the slurry piping and cause operational troubles, or the lower equipment such as slurry piping may be damaged. It is necessary to grind and remove the granulated slag adhering to the surface.

  However, since the agitation tank is a huge tank having an inner diameter and a height of nearly 10 m, the so-called “chipping operation” is performed to scrape and remove the adhering granulated slag (hereinafter simply referred to as “slag”). It is necessary to build a scaffold inside the stirring tank. However, when a person enters the inside of the agitation tank and constructs a scaffold, there is a risk that the attached slag is peeled off from the inner wall of the tank and dropped. In addition, the crushed slag slurry remains inside the tank, or the bottom of the tank is cone-shaped and has a flat surface. It is not easy to do.

  Therefore, the inventors have focused on the fact that foamed polystyrene is also used as a roadbed material and embankment material, and examined the construction of a working scaffold using this foamed polystyrene. In addition, as a technique for using foamed polystyrene as a working scaffold, for example, in Patent Document 1, a non-slip rubber is attached to the surface of one foamed polystyrene to form a single step, and a plurality of surface joints are joined via a connecting rod. A technique for forming a large step for working at a high altitude is disclosed. Patent Document 2 discloses an elevator in which a spherical foamed polystyrene is embedded in a space up to the floor surface of the lowermost landing floor at the bottom of the hoistway where the elevator car moves up and down, and a plate-like work floor is laid on the uppermost surface. A working scaffold device is disclosed.

JP 2007-205146 A JP 2006-176317 A

  However, the technique of the above-mentioned Patent Document 1 is based on the premise that the floor surface on which the platform is formed is flat, and can be applied in the case where the work scaffold is formed in a huge tank as the subject of the present invention. Can not. This technique is also dangerous because it requires a person to enter the bottom of the tank. Furthermore, each step has a problem that the cost increases because the non-slip rubber is stuck. Moreover, although the technique of patent document 2 has laid the plate-shaped work floor on the expanded polystyrene, since the expanded polystyrene needs to be a small spherical shape which can be removed with a suction machine, a large load is applied locally. Then, when the polystyrene foam in that part flows and settles, and a person gets on or places heavy equipment, there is a problem that the work floor is not stable. Moreover, in order to fill the inside of a huge tank such as a granulated slag stirring tank with spherical foamed polystyrene, a large amount of foamed polystyrene is required, and in order to remove the foamed polystyrene after work, a suction machine or the like is required. There is a problem that it is not realistic.

  The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is an operation that can be easily and safely constructed inside a huge tank such as a stirred tank of granulated slag. It is to propose a scaffold, its construction method and its specification method.

  In order to solve the above-mentioned problems, the inventors made extensive studies by paying attention to the shape and size of the polystyrene foam used mainly. As a result, the work scaffold was divided into a lower foundation and an upper work floor, and the foundation was constructed with randomly stacked block polystyrene foam and plate material laid thereon, and arranged regularly on it. It has been found that if the work floor portion is constructed with block-like foamed polystyrene and a plate material laid thereon, the problems of the prior art can be solved, and the present invention has been developed.

  That is, the present invention is a work scaffold used for work in the tank, comprising a base made of polyhedral block-shaped foamed polystyrene stacked on the bottom of the tank, and a plate material laid on the block, and at least on the base It is composed of a work floor part composed of a block-shaped foamed polystyrene layer in which one or more layers of block-shaped foamed polystyrene having a pair of parallel faces are stacked so that the parallel faces are horizontal, and a plate material laid on top of that. This is a working scaffold.

  The work scaffold of the present invention is characterized in that a sheet material is laid on the work floor.

  Moreover, the block-shaped foamed polystyrene used for the said base part of the working scaffold of this invention is a polyhedron whose longest one side is 250-1000 mm, It is characterized by the above-mentioned.

  Moreover, the block-shaped foamed polystyrene used for the said work floor part of the work scaffold of this invention is a polyhedron which has at least 1 pair of parallel surfaces, and the longest one side is 250-1000 mm.

  Moreover, the block-shaped foamed polystyrene used for the said work floor part of the work scaffold of this invention is a rectangular parallelepiped, It is characterized by the above-mentioned.

Further, the foam used for working scaffolds of the invention, 10% deformation compression strength was measured by the method prescribed in JIS K7220 is characterized in that it is of 10 N / cm ² or more to be.

  Moreover, the said board | plate material used for the working scaffold of this invention is a structural plywood and / or a concrete formwork plywood, It is characterized by the above-mentioned.

  The working scaffold of the present invention is characterized in that the upper surface height of the first stage of the work floor is the lower limit height required for the work in the tank.

  Further, the present invention is a construction method of a work scaffold according to any one of the above, wherein after stacking polyhedral block-like foamed polystyrene on the bottom of the tank, and further forming a base portion by spreading a plate material thereon, Stacking one or more polyhedral block-shaped polystyrene foams having at least one pair of parallel surfaces on the base portion so that the parallel surfaces are horizontal, and further spreading a plate material thereon to form a work floor portion We propose a method for constructing a work scaffold characterized by

  The work scaffold construction method of the present invention is characterized in that a sheet material is further laid on the work floor portion.

  Further, the present invention is a method for using a working scaffold according to any one of the above, wherein the work floor portion is composed of a plurality of styrofoam layers, wherein the number of steps of the work floor portion is sequentially reduced from a high place to a low place. We propose a method of using a work scaffold characterized by advancing the work in the tank.

  According to the present invention, even when working in a huge tank where the work location is at a high place, a work scaffold can be safely and easily constructed without a person entering the bottom of the tank before the work. Since the work in the tank can be performed safely and efficiently, it can greatly contribute to the improvement of the efficiency and safety of the work in the tank.

It is the schematic explaining the manufacturing process of granulated slag. It is a figure explaining the fundamental part which piled up the polystyrene foam at random. It is a figure explaining the work floor part which accumulated the polystyrene foam so that the surface parallel on the base part of FIG. 2 might become horizontal. It is a figure explaining the other example of the work floor part which accumulated the polystyrene foam so that the surface parallel on the base part of FIG. 2 might become horizontal. It is a figure explaining the usage method of the working scaffold of this invention. It is a figure explaining the work scaffold used in the Example of this invention.

The embodiment of the present invention will be specifically described with reference to an example of a slag chipping scaffold attached to the inner wall of a granulated slag agitation tank.
As described above, in the past, the scaffold used for the slag removal work attached to the upper inner wall of the granulated slag agitation tank, people entered the bottom of the agitation tank, and the scaffolding pipes were assembled using joints etc. . For this reason, the slag adhered to the inner wall during work may be peeled off due to its own weight, resulting in a human disaster. Moreover, since the bottom part of the stirring tank is not flat, various pipes are disposed, and slurry of the granulated slag remains on the bottom part, it is not easy to construct a scaffold.

  As a method for solving the above-mentioned problems, the inventors have examined the use of foamed polystyrene, which is also used as a roadbed material or embankment material, as a scaffold material. However, as described above, the conventional technique requires that the floor surface for constructing the scaffold is flat or uses a small spherical reinforced foamed polystyrene. There is a problem that the work floor is not stable because it wakes up and sinks, and it is difficult for a person to get on the work floor or to place heavy equipment on it. Furthermore, it is not easy to fill or remove a small spherical reinforced foamed polystyrene in a huge tank like a granulated slag agitation tank because the amount required for filling becomes large and time is required.

  Therefore, the inventors decided to use a polyhedral block-shaped foamed polystyrene instead of the spherical foamed polystyrene. Styrofoam is lightweight, so if the size of the block is set to an appropriate size that is easy for humans to handle, a scaffold can be constructed with human power alone without using a special device, and it should be a polyhedron. This is because no flow occurs like a spherical body. Furthermore, as in the case of a spherical shape, the scaffold can be stabilized without being densely packed, so that the amount of foamed polystyrene used can be reduced.

  The work scaffold of the present invention developed based on the above idea was stacked in one or more layers on the base part composed of block-shaped foamed polystyrene stacked on the bottom of the tank, and the plate material laid on top of it. It is comprised from the work floor part which consists of block-shaped foam polystyrene and the board | plate material spread | laid on it.

  As described above, the base part of the working scaffold of the present invention is composed of a plate material in which polyhedral block-shaped foamed polystyrene is stacked in a tank and then spread on the foamed polystyrene. Here, the block-shaped foamed polystyrene at the base portion of the work scaffold may be regularly stacked, but may be a randomly stacked structure. The reason why the structure can be randomly stacked is that if it is a polyhedral block shape, even if it is randomly stacked in the tank, the corners of the block touch the surface part of the adjacent block so that it is spherical. This is because it does not cause flow like the body. In addition, since the polystyrene foam is lightweight, if it is randomly stacked, it is only necessary to put it up to a predetermined height in the tank, so if the size of the block is easy to handle and weight, the bottom of the tank This is because the base portion can be formed by human power without entering the process and without using a special device.

  Here, as for the magnitude | size of the block-shaped foam polystyrene used for the said base part, it is preferable that the longest one side is a polyhedron with 250-1000 mm. If it is a polyhedron, once it is filled in a stable state, it does not cause flow like a sphere for the reasons described above, and a high strength base can be obtained. However, if the longest side is smaller than 250 mm, the number of foamed polystyrene to be added increases and workability is lowered. On the other hand, if it exceeds 1000 mm, it becomes difficult to handle manually, and the unevenness on the top surface of the expanded polystyrene becomes large, so it is difficult to obtain a flat surface even if a plate material is laid on the entire surface. . Furthermore, in consideration of workability when using a flexible container bag or the like for discharging the expanded polystyrene after work, it is more preferable that the longest side of the polyhedron is in the range of 400 to 600 mm.

  In addition, the shape of the block-shaped foamed polystyrene used for the base part may be a polyhedron and is less limited than the block-shaped foamed polystyrene used for the work floor part described later, but the same shape as the block-shaped foamed polystyrene used for the work floor part. If used, there is an advantage that both can be shared.

  Further, the block-shaped foamed polystyrene used for the lower part of the foundation part is larger than the above-mentioned polyhedral foamed polystyrene as long as it does not adversely affect the unevenness of the upper surface and does not form a large void, that is, does not affect the strength. You may use together. As a result, the number of polystyrene foams introduced can be reduced and work efficiency can be improved.

Further, the polystyrene foam used in the present invention is required to have a certain level of strength from the viewpoint of securing the strength required as a scaffold, and preferably 10% deformation compression measured by the method defined in JIS K7220. The strength is preferably 10 N / cm ² or more. With the above strength, for example, even if a safety factor of 3 is taken into consideration, 20 or more people are working, and the suspended load of 1 ton of waste generated by the chiseling work is 3m high This is because sufficient strength can be ensured even when falling from the top.

  Further, it is preferable that at least one of the width and the length of the plate material laid on the randomly stacked polyhedral foam polystyrene is larger than the longest side of the polyhedral foam polystyrene. This is because if the plate material is smaller than the foamed polystyrene, the plate material falls into the concave and convex concave portions formed on the top surface of the foamed polystyrene that is randomly stacked unless the plate materials are joined to each other, and a flat surface cannot be obtained. From such a viewpoint, the width and / or length of the plate material used in the present invention is preferably 1.5 times or more, more preferably 2 times or more of the length of the longest side of the expanded polystyrene.

  In addition, it is preferable that the plate material is light and easy to handle by manpower, and has an appropriate strength that does not break even if a person is placed on the plate material, and specifically, a commercially available thin steel plate. Alternatively, a plywood such as a structural plywood used for a structure such as a house or a concrete formwork plywood (concrete panel) used for a concrete formwork can be used. Among them, a plywood is lighter than a steel plate, has an appropriate strength, and can easily be obtained having a width of about 900 × length of about 1800 mm.

  The working scaffold according to the present invention includes a polyhedral block-shaped polystyrene foam having at least one pair of parallel surfaces stacked on the base portion in one or more steps so that the parallel surfaces are horizontal, and further It is necessary that the work floor portion is formed by laying the plate material. This work floor is used for performing in-tank operations such as chipping.

  Here, the reason why the work floor is required is that the top surface of the block-shaped foamed polystyrene that is randomly stacked has large irregularities, and as shown in FIG. 2, a flat surface can be obtained even if a plate material is spread on it. In addition to being difficult, if an uneven load is applied to the plate material, such as when a person rests on the laid plate material, the plate material itself moves up and down and is unstable, so only the foundation works safely. Because you can't.

  However, when polyhedral block-shaped foam polystyrene having at least one pair of parallel surfaces is stacked on the base plate material, one or more steps so that the parallel surfaces are horizontal, and the plate material is laid on top of it Produces an effect as if it were covered with a single large lid (hereinafter also referred to as the “top lid effect”), and the load from above is dispersed, and pressure is evenly applied to the plate on the foundation. The irregularities on the upper surface of the foamed polystyrene at the base portion stacked at random are absorbed, and the plate material laid on it is flattened. As a result, as shown in FIG. 3, the polystyrene foam stacked on the base portion is also flattened. Therefore, when a plate material is laid on the base, a more flat and stable work floor can be obtained. it can. Furthermore, since the work floor with sufficient strength can be obtained by the upper lid effect, it becomes possible for a person to get on or place heavy equipment on the work floor.

  Here, when stacking one or more polyhedral block polystyrene foams having at least one pair of parallel surfaces, the parallel surfaces are generally horizontal and the spacing between the blocks is substantially uniform from the viewpoint of securing scaffold strength. The arrangement interval of the block-shaped foamed polystyrene is preferably set as appropriate according to the required scaffold strength. The method of stacking the block-shaped foamed polystyrene is not particularly limited as long as the parallel surfaces are substantially horizontal. For example, the block-shaped foamed polystyrene is arranged in a grid pattern as shown in FIG. It is free to arrange them in a zigzag pattern like

  The block-shaped foamed polystyrene used for the work floor is required to be a polyhedron having at least one pair of parallel surfaces, and it is important to arrange the parallel surfaces so as to be substantially horizontal. Here, the polyhedron having at least one pair of parallel surfaces is preferably a rectangular parallelepiped (including a cube) in which the pressure is transmitted downward in a uniform manner. In the case of a rectangular parallelepiped, it is preferable that the length of one side in the horizontal direction is longer than the length in the height direction. This is shown in FIG. 3 showing an example in which the same size foamed polystyrene is used for the work floor part and the foundation part, and the horizontal length of the polystyrene foam used in the work floor part is twice as large as the foam foam of the foundation part. As can be seen by comparing FIG. 4 showing an example using the above, the load applied on the work floor is more dispersed when the large foamed polystyrene is used for the work floor, and the upper lid effect described above is used. This is because it is enhanced.

  However, if the block-shaped foamed polystyrene is too large, it is difficult to handle it manually, so it is preferable to make it 3 times or less of the foamed polystyrene used for the foundation. Moreover, if the polystyrene foam is used in a plurality of shapes that are multiples of the basic size (for example, the length of one side is twice), it can be appropriately combined and stacked according to the shape of the floor. Therefore, it is preferable. As described above, the block-shaped foamed polystyrene used for the base portion may be a polyhedron that does not have parallel surfaces. However, if the same block as that of the work floor portion is used, it can be used in any case, which is preferable.

  Further, the same plate material as that of the base portion can be used as the plate material spread on the work floor portion. However, for the reason of obtaining the same “top cover effect” as in the case of the polystyrene foam used for the work floor portion, it is preferable to use a material larger than the plate material used for the base portion.

  In the work scaffold of the present invention, it is preferable that a sheet material is further laid on the upper surface of the work floor portion after the plate material is laid down. The reason for this is to prevent the working materials and wastes such as slag removed by the chiseling operation from dropping in addition to the curing of the plate material. In other words, when the sheet material is not laid, the slag that has been crushed and dropped by the scraper falls to the bottom of the tank through the gap between the plate material and the polystyrene foam, so it is necessary to recover it later with a great deal of time and effort. However, the amount of fall can be minimized by laying the sheet material.

  It is desirable that the sheet material is not easily damaged even if a person or material is placed on the sheet material. For example, a commercially available blue sheet made of synthetic resin that is often used in the field of construction and civil engineering is suitable. Can be used. This blue sheet has a structure in which a synthetic fiber is sandwiched between synthetic resin films, so that it is strong against tension and difficult to tear, and is excellent in waterproofness.

Next, the construction method of the work scaffold of this invention is demonstrated.
As described above, the construction method of the working scaffold according to the present invention is formed by stacking polyhedral block-like foamed polystyrene on the bottom of the tank, and further laying a plate material thereon to form a foundation, and then at least 1 on the foundation. Stack one or more polyhedral block-shaped polystyrene foams having parallel planes so that the parallel planes are horizontal, and then spread a plate on top of them to form a working floor, and then if necessary In this method, a sheet material is laid on the work floor.

  Here, the method of stacking the block-shaped foamed polystyrene at the bottom of the tank is not particularly limited, but if it is a random stacking method, the block-shaped foamed polystyrene is placed in the tank at a predetermined height from above the tank. It can be done easily by human power, since it is only necessary to insert it until it becomes. In addition, when introducing the expanded polystyrene, it is needless to say that the unevenness on the upper surface of the expanded expanded polystyrene is made as small as possible. In addition, since it is not necessary for a person to enter the bottom of the tank before work, the work can be performed safely.

  Then, after laying a plate material on the top surface of the above-mentioned expanded polystyrene, a block-shaped foam polystyrene having at least one pair of parallel surfaces is further placed on the plate material so that the parallel surfaces are horizontal and the top surface Are arranged so as to be as flat as possible to form one or more styrofoam layers. These operations need to be performed by a person entering the tank, but since the operations are performed on foamed polystyrene that has been stacked up to a predetermined height, the slag falls and its height is small. Since the process is completed in a short time, it can be performed safely by securing a retreat distance.

  Here, the number of steps of the expanded polystyrene is one or more, as described above, a stable work floor cannot be obtained only with the base portion in which the expanded polystyrene is randomly stacked, and the operation includes at least one expanded polystyrene layer. Because it is necessary to provide a floor, and when the range in the height direction where the work in the tank such as the chiseling work is wide, it is possible to obtain the required working scaffold height by stacking the polystyrene foam. It is.

  Therefore, it is preferable to set the upper surface height of the first-stage foamed polystyrene layer of the work floor to the minimum height required for the work in the tank, and the upper surface height of the foamed polystyrene layer in the base is also adjusted accordingly. Is preferably determined. If the height of the top surface of the first styrofoam layer is set to the minimum height required for the work in the tank, if a higher height is required, the number of styrofoam layers on the work floor can be increased. is there.

  Next, a plate material is spread on the upper surface of the stacked polystyrene foam to form a work floor portion, and then a work scaffold is constructed by laying a sheet material thereon as necessary. In addition, in order to ensure a required intensity | strength, the said sheet | seat material may be laid in piles 2 or more.

Next, a method for using the work scaffold of the present invention will be described.
As described above, the work floor portion of the work scaffold of the present invention is formed of one or more styrofoam layers, and when the work range in the height direction is wide, two or more steps are required. In this way, when it is composed of multiple layers of styrofoam, after stacking the work floor to the maximum height required for work, work in the tank from high to low while gradually reducing the number of steps on the work floor. It is preferable to proceed. That is, as shown in FIG. 5, after stacking the height of the work floor to the highest position necessary for the work in the tank, the chipping is started from the top, and when the topmost work is completed, This is because the work can be performed efficiently by removing the expanded polystyrene layer to lower the height and repeatedly starting the chipping operation. Furthermore, by starting the pulverization of the granulated slag from a low place, there is also an advantage that the granulated slag adhering to the high place falls and does not cause an unexpected disaster.

The part of the granulated slag agitation tank consisting of a lower part of a cylindrical part having an inner diameter of 8.2 m and a height of 5 m, and a truncated cone part (cone part) having a height of 2.7 m and a height of about 3 m or more from the bottom. In order to remove the granulated slag adhering to a thickness of about 80 cm over a width of about 3.5 m on the inner wall, a working scaffold was constructed in the following manner according to the present invention, and the granulated slag was chiseled.
First, a cubic foamed polystyrene having a compression strength of 11.5 N / cm ^{2 and} a side of 0.5 m was manually inserted into the granulated slag stirring tank until the height from the bottom became about 3.2 m. Thereafter, a structural plywood (plywood) having a thickness of 3 mm, a width of 0.9 m, and a length of 1.8 m was spread on the upper portion to form a base portion. In the lower part of the base part, a 0.5 m × 1.0 m × 0.5 m rectangular foam was also used as a part of the foam.
Thereafter, a 0.5 m × 1.0 m × 0.5 m rectangular polystyrene foam is placed on the foundation 3 so that the sides of 0.5 m are in the height direction and the intervals are substantially uniform. After stacking in steps, on the upper surface, a structural plywood (plywood) with a thickness of 3 mm × width 0.9 m × length 1.8 m is spread to form a working floor portion of 1.5 m in height, On top of that, a commercial blue sheet was laid as a sheet material to construct a working scaffold. FIG. 6 shows a schematic diagram of the work scaffold constructed as described above.

Using the work scaffold thus obtained, the slag work of the granulated slag adhering to the inner wall of the stirring tank was performed according to the method of using the work scaffold of the present invention.
First, the uppermost part of the granulated slag adhering to the inner wall of the tank was removed using the upper surface of the working floor part composed of the three-stage foamed polystyrene layer as the working floor. Next, the third-stage expanded polystyrene layer was removed, and a sheet material was laid on the upper surface of the second-stage expanded polystyrene layer to form the next work floor, and the newly exposed granulated slag was removed. Next, the second styrofoam layer is removed, a sheet material is laid on the top surface of the first styrofoam layer to form the next work floor, the newly exposed granulated slag is removed, and the chipping work is performed. Completed.

  Crushing the granulated slag adhering to the inner wall of the granulated slag agitation tank, and carrying out the crushing work by using the method according to the present invention described above and a person entering the bottom of the tank and constructing a scaffold with dedicated pipes and fittings Table 1 shows a comparison of the working time and the total weight of the scaffold required for the conventional method. As can be seen from this table, by applying the present invention, the scaffold construction time and the scaffold dismantling time can be greatly shortened. Furthermore, according to the present invention, there is no need to construct a scaffold by entering a bottom of the tank or to collect slag after chipping that has fallen to the bottom of the tank. And can be performed efficiently.

  In the above description related to the present invention, the stirring tank of the granulated slag has been described as an example. However, the technology of the present invention is not limited to the above example, and other work in the tank having similar problems, or opening. It can also be suitably used as a working scaffold or the like in a place where the part is at a high place.

1: Granulated slag stirring tank 2: Stirred tank cylindrical part 3: Stirred tank cone part 4: Granulated slag adhering to the inner wall of the stirring tank 5a: Blocked polystyrene foam 5b: Blocked polystyrene foam 6a: Foundation Plate material 6b: Work floor plate material 7: Work scaffold foundation 8: Work scaffold work floor 9: Sheet material

Claims (11)

A working scaffold used for work in a tank,
A basic part composed of polyhedral block-shaped foamed polystyrene stacked on the bottom of the tank, and a plate spread on top of it,
A block-shaped foamed polystyrene layer in which a polyhedral block-shaped foamed polystyrene having at least one pair of parallel surfaces on the base part is stacked one or more levels so that the parallel surfaces are horizontal, and a plate material laid on the block-shaped foamed polystyrene layer A working scaffold composed of a working floor. The work scaffold according to claim 1, wherein a sheet material is laid on the work floor portion. The work scaffold according to claim 1 or 2, wherein the block-shaped foamed polystyrene used for the foundation is a polyhedron having a longest side of 250 to 1000 mm. The block-shaped foamed polystyrene used for the said work floor part has at least 1 pair of parallel surfaces, The longest one side is a polyhedron of 250-1000 mm, The any one of Claims 1-3 characterized by the above-mentioned. Work scaffold described in The work scaffold according to any one of claims 1 to 4, wherein the block-shaped foamed polystyrene used for the work floor is a rectangular parallelepiped. The Styrofoam work scaffolding according to any one of claims 1 to 5, characterized in that 10% deformation compression strength was measured by the method prescribed in JIS K7220 is the 10 N / cm ² or more to be. The work scaffold according to any one of claims 1 to 6, wherein the plate material is a structural plywood and / or a concrete formwork plywood. The work scaffold according to any one of claims 1 to 7, wherein the upper surface height of the first stage of the work floor is a lower limit height necessary for work in the tank. A construction method for a work scaffold according to any one of claims 1 to 8,
After stacking polyhedral block-shaped foamed polystyrene on the bottom of the tank, and further forming a foundation by spreading a plate over it,
At least one pair of polyhedral block polystyrene foam having at least one pair of parallel surfaces is stacked on the base portion so that the parallel surfaces are horizontal, and further, a plate material is spread thereon to form a work floor portion. The construction method of the working scaffold characterized by this. The work scaffold construction method according to claim 9, wherein a sheet material is further laid on the work floor portion. The working floor according to any one of claims 1 to 8, wherein the working floor is a working scaffold comprising a plurality of styrofoam layers,
A method of using a work scaffold, wherein the work in the tank is advanced from a high place to a low place while sequentially reducing the number of steps of the work floor.

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