JPH094213A - Construction method of working floor in silo - Google Patents

Abstract

PURPOSE: To eliminate assembling or disassembling works of a lot of scaffold materials in a silo and remove such a risk to damage the quality that a hole is opened at the ceiling of silo. CONSTITUTION: When a working floor 25 is constructed for the scaffolds for repairing the inside of a silo 1, light and hollow filling materials 23 are sent in the inside of silo 1 and the working floor 25 is constructed by making use of the filling materials 23 as a support. The height or working floor 25 can be changed in accordance with the progress of the repair work of the inside of silo by discharging the light and hollow filling materials to change the charged bulk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple construction method for a work floor used as a scaffold for repairing, inspecting, and cleaning the inner surface of the tower body of an existing silo.

[0002]

2. Description of the Related Art There are various structures for the tower body of an existing silo, such as steel structure, reinforced concrete structure (RC structure), fiber reinforced plastic structure (FRP structure).
In particular, many reinforced concrete silos require repairs inside the tower. The airtightness of this product deteriorates with the lapse of years after construction, and the internal pressure cannot be maintained during the fumigation performed during the grain storage process, and complete processing cannot be performed, or fumigation that leaked from the silo The gas may also adversely affect the surrounding workers. The main cause of such a decrease in airtightness is cracks that occur in concrete, and it is impossible to completely cut off the leak path by only partial repair. Therefore, in recent years, a lining method for the entire inner surface of the silo tower, especially a method using a prefabricated molded plate, has been proposed and is about to be put into practical use.

This type of silo has, for example, a funnel-shaped bottom portion 1a as shown in FIG.
It is a cylindrical tower of 0 to 40 m, and an input port 2 and a hatch 3 for inspection of grain that is conveyed by a conveyor above the tower body 1.
However, a discharge port 5 is provided with a hopper gate 4 at the bottom.
And a lower hatch 6 are provided. Usually, several tens of silos are assembled so that they are adjacent to each other.

Conventionally, when repairing, inspecting or cleaning the inner surface of the tower body of such a silo (hereinafter collectively referred to as repair work), a scaffold 7 for construction is temporarily provided as a working floor inside the silo ( (Fig. 8) Or circular gondola 8
Is generally performed (FIGS. 9 and 10). As for the temporary construction of the scaffolding, the assembly type scaffolding 7 is assembled into a cylindrical shape along the inner wall of the silo tower body 1. The scaffolding material is carried in through the opening of the silo upper opening 2, the inspection hatch 3 or the like, or the silo lower opening 5, the lower hatch 6 or the like, and is assembled inside the silo. In construction, a worker rides on the scaffold 7 and performs most of the work manually. After the completion of the repair work, the scaffold 7 is disassembled, and the scaffold material is carried out to the outside through the opening at the bottom.

When the circular gondola is temporarily installed, the circular gondola 8 having a doughnut-shaped floor 8a smaller than the inner diameter of the silo tower body 1 is divided and carried into the silo, and assembled inside the silo. The assembled circular gondola 8 is normally suspended by three or more suspension wires 9. Each hanging wire 9 is wound around a winch 11 on the ceiling through a wire through hole 10 formed in the silo ceiling, and the circular gondola 8 is raised and lowered by hoisting and lowering the winch 11 for repair work. After completion of the repair work, the circular gondola 8 is disassembled and carried out to the outside of the silo, and the wire passage hole 10 on the silo ceiling is filled for repair.

[0006]

In the construction work of the work floor in the conventional silo, a large amount of scaffolding material, temporary material such as circular gondola material, and the like are carried in and out from the opening at the upper part of the silo or the lower part of the silo. There is a need. However, since the size of these openings is, for example, only about 500 to 800 mm in diameter or one side length, a considerable amount of labor is required for loading and unloading these temporary materials,
There is a problem that there are many restrictions.

In the case of temporarily constructing the scaffold, the scaffold material carried in is manually assembled in the silo to construct the scaffold temporarily over the entire inner surface of the silo, and after the repair work is completed, the constructed scaffold is manually disassembled. Therefore, there is a problem that a large amount of time and labor is required for temporary work on the work floor. On the other hand, when the gondola is temporarily installed, there is a problem in that it is not preferable in terms of work quality because a hole is purposely made in the ceiling of the silo and the hanging wire is passed through.

Therefore, the present invention has been made to solve the problems in the construction of a work floor in such a conventional silo, and manually assembles or disassembles a large amount of scaffolding material in the silo. It is an object of the present invention to provide a method for constructing a work floor in a silo that does not need to be installed or that there is no risk of degrading quality such as making holes in the silo ceiling.

[0009]

The invention according to claim 1 of the present invention for achieving the above object is a method for constructing a working floor to be used as a scaffolding for repairing the inside of a silo tower body, which is lightweight inside the silo tower body. The present invention is characterized in that a hollow body packing is fed and a working floor is constructed using the packing as a support material. The invention of claim 2 of the present invention comprises the steps of feeding the lightweight hollow body packing into the silo tower body through the opening of the silo tower body, carrying in the work floor material into the silo tower body, and A step of assembling a floor material on the packing to form a working floor, the working floor being adjusted according to the repair work by adjusting the bulkiness of the lightweight hollow body packing fed into the silo tower body It is characterized by raising and lowering.

Here, the lightweight hollow body filling material may be made of rubber balls or plastic balls (claim 3). Further, the lightweight hollow body filling is composed of an air bag, the air is deflated and carried into the silo tower body, and then the air is pressed into the air bag in the silo tower body to inflate the work floor. It may be supported (Claim 4).

A fifth aspect of the present invention is characterized in that a horizontal holding device is provided on the work floor. The invention of claim 6 of the present invention is characterized in that a suspension scaffold is provided directly below the ceiling opening of the silo tower body, and the working floor is constructed by riding on the suspension scaffold.

[0012]

According to the first aspect of the present invention, the lightweight hollow body packing is fed into the silo tower body by some means, and the working floor is supported by the filled lightweight hollow body. The means for feeding the lightweight hollow body may be, for example, dropping by gravity using a conveyor, pressure feeding by pressure gas, or manually feeding. The fed lightweight hollow bodies are sequentially stacked and filled in the silo from the bottom. The work floor materials brought into the silo are assembled on the packing to construct the work floor. Unlike the conventional scaffolding, the work floor is not constructed by stacking three or more layers three-dimensionally over the entire inner circumference of the silo tower body, and it is sufficient to construct one floor in plan.

According to the second aspect of the present invention, the filling of the lightweight hollow body packing into the silo may be carried out from the upper opening of the silo tower body or the lower opening of the silo tower body. The fed lightweight hollow bodies are sequentially stacked and filled from the bottom of the silo, and the work floor material carried into the silo tower body is used to form a work floor for one floor above the filling material.
Then, by adjusting the height of the working floor by adjusting the bulkiness of the lightweight hollow body filling and raising and lowering the working floor, the entire surface of the inner wall of the silo tower is repaired from the top to the bottom. Allow work.

At this time, the bulkiness of the filling of the lightweight hollow body is adjusted by discharging the filled lightweight hollow body from the inside of the silo tower body or feeding it. The work floor material may be loaded into the silo before or after the lightweight hollow body filling material is loaded into the silo. Also, the shape of the work floor may be, for example, a donut plate shape or a disk shape that is close to the inner circumference of the silo tower body, and there is no particular limitation on either.

However, when the filling of the lightweight hollow body is carried out from the opening in the upper part of the silo tower and the stacking and filling are sequentially carried out from the bottom, the material for assembling the working floor is carried in after the feeding of the lightweight hollow body packing. Then, it is preferable to assemble the working floor on the filled lightweight hollow body layer. The reason is that if the disk-shaped working floor is loaded into the silo in advance before the filling of the lightweight hollow body packing and assembled, the inlet of the lightweight hollow body from the opening in the upper part of the silo tower will be blocked. This is because. In that case, the disc-shaped work floor material is not assembled but hung as it is under the ceiling of the silo, and it is assembled after the lightweight hollow body filling material has been fed, so that the filling of the lightweight hollow body is not hindered. It is necessary to consider so.

However, in the case of a donut plate type work floor,
Even if the work floor material is loaded into the silo in advance and the silo bottom is assembled before it is loaded into the silo, if it is hung under the silo ceiling, the hollow hollow will be opened from the top of the silo. Even if the body is thrown in, it is possible to fill the silo through the hole in the center of the doughnut-shaped work floor.

When the filling of the light-weight hollow body is carried out through the opening in the lower part of the silo tower body, the work floor material is first carried into the silo tower body, and the work floor is preliminarily set at the bottom (bottom part) of the silo tower body. After assembling, the lightweight hollow body packing is sent from the bottom of the silo tower body and the assembled work floor is pushed up by the packing, and the repair work of the predetermined location on the inner surface of the silo is performed from bottom to top. It is also possible to construct one after another. . The height of the working floor is adjusted to suit the repair work by lifting and lowering the lightweight hollow body packing through the opening at the bottom of the silo tower. When raising and lowering the work floor, it is advisable to perform the work while keeping the work floor horizontal with a work floor horizontal maintenance device.

When the work floor material is loaded into the silo through the opening on the upper part of the silo tower and the work floor is assembled on the upper part of the silo, a hanging scaffold is provided in advance just below the ceiling opening on the upper part of the silo tower. By performing work floor construction work such as laying scaffolding boards on the suspended scaffolding, it is possible to prevent a worker from collapsing and improve work safety. The lightweight hollow body filler used in the present invention includes a rubber ball, a plastic ball, which is light and bulky, has high strength, and is easy to handle, or
An air bag made of a material such as rubber, plastic or airtight cloth is suitable.

Rubber balls and plastic balls can be used as they are. When an airbag is used as the lightweight hollow body filling material, it is preferable to stack and use a plurality of airbags having a diameter smaller than the inner diameter of the silo tower body. Each airbag is deflated, folded, and carried in through an opening at the top or bottom of the silo. Then, air is inflated with a compressor etc. in the silo. On the air bag, the work floor materials brought into the silo are assembled and supported by the air bag. The height of the work floor is adjusted by raising the work floor by introducing air into the air bag and by lowering it by extracting the air (that is, the filling material) from the air bag.

In the present invention, the work floor is lightweight because it only requires one floor, and the work floor material can be easily carried in and out even from the narrow opening of the silo. Moreover, it is supported by a lightweight hollow body filled in the silo, and the height of the working floor can be easily adjusted by adjusting the bulkiness by putting in and taking out the filling of the lightweight hollow body, so that a large supporting mechanism is not required and work is extremely difficult. To be easy.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a silo for explaining an embodiment of a work floor construction method of the present invention. A silo cylindrical tower body 1 having a funnel-shaped bottom portion 1a has a ceiling portion 1b at the center of which an inlet 2 for stored items is provided, and a main conveyor 15 from the ground is provided.
It is designed so that the stored goods transported in step 6 can be put into the silo. The ceiling portion 1b is further provided with a hatch 3 for inspection. At the tip of the funnel-shaped bottom part 1a, there is a discharge port 5 which is opened and closed by a hopper gate 4 and is connected to a conveyor 16 for drawing out stored items. Further, a lower hatch 6 is provided as a lower opening for entering and exiting the slope of the funnel-shaped bottom portion 1a.

Construction of a work floor for repairing the inner wall surface of this silo is performed as follows. The silo is emptied and the bottom hopper gate 4 is closed. [I] Temporary provision of work floor support (FIG. 1): In the silo tower body 1, at least three rails 20 are installed in the vertical direction. At the top of the rail 20, an L-shaped support tool 22 that engages with the rail via a vertical moving pulley 21 is placed near the hanging ceiling 1b. Members such as the rail 20, the pulley 21, and the support 22 are carried in from the inspection hatch 3.

[II] Feeding of lightweight hollow body packing (FIG. 2):
By using the main conveyor 15, a plastic sphere 23, which is a lightweight hollow body filling material, from the storage material input port 2 into the silo.
A large amount of (for example, a tennis ball size) is charged and filled in the silo. [III] Work floor material loading (Fig. 3): Inspection hatch 3
Use the to load work floor materials such as scaffolding boards into silos. The silo is already filled with the plastic balls 23, and these carry-in materials may be placed on the filling layer.

[IV] Work Floor Assembly (FIG. 1): The worker is to scaffold the scaffolding board 2 between the L-shaped supports 22 that are suspended.
4 is spread and the working floor 25 is constructed. At that time, if a suspension scaffold (not shown) is provided in advance just below the inspection hatch 3 that is the ceiling opening and the scaffold plate 24 is laid on the suspension scaffold, the worker can be prevented from falling. And safe. The constructed work floor 25 is supported by the plastic balls 23 filled in the silo, and the worker can use this work floor 2
Using 5 as a scaffold, the repair work of the uppermost part of the silo inner wall can be performed.

In the present invention, since the work floor itself is supported by the lightweight hollow body filling material, it requires almost no strength and is much smaller and lighter than the conventional scaffold 7. Also, since the work floor can be raised and lowered according to the location of the repair work, it is not necessary to construct a three-dimensional stack of layers over the entire inner circumference of the silo tower body as in the conventional scaffold 7, and one level in plan. You only have to build it. Therefore, by dividing the work floor into separate pieces, each component material has a size and weight that can be carried by hand.
Use a work floor with a shape. As a result, the work floor material can be easily carried into the silo from the inspection hatch 3. In terms of assembling the work floor, specifically, if the work floor is a circular work floor, then a plurality of elongated scaffolding plates with a substantially rectangular shape and arcuate ends are used. It suffices to place the fan-shaped scaffolding plates of the above in order on the support 22.

[V] Movement of work floor (FIG. 4): After the repair work of the uppermost part of the silo inner wall is finished, the work floor 25 of the scaffolding is lowered by one step, and the work of the silo inner wall therebelow is carried out. The lowering of the working floor 25 is performed by opening the hopper gate 4 at the bottom of the silo and partially withdrawing the plastic balls 23 in the silo from the discharge port 5 by the pulling conveyor 16. The degree of descending depends on the amount to be extracted.

In this way, the repair work is carried out while repeatedly adjusting the position of the work floor 25 by extracting the plastic balls 23 in the silo by a predetermined amount in accordance with the progress of the repair work. When the work floor 25 is moved down or up in the silo, the work floor 2
It is desirable to move up and down while maintaining the horizontal of 5. For that purpose, a horizontal holding device may be provided on the work floor 25. Specifically, for example, a pulley is attached to the end surface of the working floor 25, and the pulley is used to wind the working floor 25 while maintaining the horizontal with a manual winding winch, or a weight is attached to the working floor 25. It is possible to employ a method in which the load is distributed on the work floor 25 to make the load uniform during movement.

[VI] Dismantling and unloading the work floor and temporary rail (Fig. 5): When the repair work from the top to the bottom of the silo inner wall is finished, the work floor 25 is dismantled and the work floor material is removed from the lower hatch 6. Carry out to the outside. In addition, rail 20, pulley 2
1, members such as the support 22 are carried out from the inspection hatch 3 and / or the lower hatch 6. In the above embodiment, the work floor material was loaded into the silo after the plastic balls 23 were loaded into the silo from the storage material loading port 2. However, the present invention is not limited to this, and the work floor material is loaded first. It is also possible to do this. For example, the work floor has a donut plate shape, and the L-shaped support tool 22 previously installed in the silo is the rail 20.
The dough plate-shaped work floor is assembled by laying down the work floor materials carried in from the lower hatch 6 on the L-shaped support member 22 and then hanging the work floor along the rail 20. Lift up to near the ceiling part 1b of the silo. After that, when the plastic ball 23 is loaded from the storage port 2, the plastic ball 23 passes through the central opening 25a of the doughnut-shaped working floor 25 and falls, as shown in FIG. Therefore, the plastic balls 23 can be filled up to the top of the silo without being obstructed by the work floor 25.

However, the circular work floor does not have an opening at the center, and therefore cannot be assembled first. In that case, the work floor material previously carried into the silo is not assembled but is hung by the support tool 22 near the ceiling part 1b of the silo. After that, the plastic balls 23 are put into the silo from the input port 2 of the stored material and filled, and after the filling is completed, the work floor material is unloaded to assemble the work floor. Therefore, in this case, it is preferable to load the plastic balls 23 first and then carry in the material for assembling the working floor into the silo to assemble the working floor.

In the above embodiment, the plastic balls 23 are put into the silo through the storage inlet 2. However, the present invention is not limited to this, and the plastic balls 23 are used from the outlet 5 at the bottom of the silo using pressurized air or the like. You may make it press-fit. In that case, regardless of whether the work floor 25 is circular or donut-shaped, it is assembled first at the bottom of the silo, and then the installation height is adjusted while pushing up with the plastic ball 23 to be filled, and the inner wall of the silo is repaired in order. You may do it.

According to the first embodiment, the work floor itself is much smaller than that in the case of constructing a large-scale scaffold on the entire inner surface of the silo as in the conventional construction of the work floor, so the work setup can be performed. Small and easy. When constructing the work floor, it is possible to obtain effects such as eliminating the need for special processing such as connecting the scaffold wall to the silo and the through hole for the gondola wire.

FIG. 7 shows another embodiment. This example is
The airbag 30 is used as the lightweight hollow body filling material. The airbag 30 may be a rubber product, a plastic product, or a textile product such as an airtight cloth. It is conceivable that the airbag should be a single one whose size and shape match the internal shape of the silo tower body 1, but it is divided into multiple parts to ensure safety when it is torn, for example in the height direction of the silo. It is better to stack them in layers. In that case, an airbag in which one large interior is divided by a plurality of stages of partition walls (compartment type) may be used, or a plurality of small airbags may be stacked (stacked type). In any case, the diameter of the airbag is set to be slightly smaller than the inner diameter of the silo tower body 1, and the air inlet 31 with the check valve and the air outlet 32 with the on-off valve are provided for each compartment or each airbag. It is desirable to provide it so that air can be taken in and out.

A method of constructing a work floor in a silo using the air bag 30 is performed in the following procedure. [I] Carrying in an air bag: The air bag 30 in a folded state is carried into the previously empty silo from the opening of the hatch 3 at the upper part of the silo or the hatch 6 at the lower part of the silo.

[II] Blowing air into the air bag: A compressor is connected to the air blowing port 31 of the air bag protruding from the hatch 6 at the bottom of the silo to inflate air. As the compressor, it is possible to use the compressor which is installed in the silo plant in some cases. In the case of a compartmental type airbag, by blowing from the air blowing opening 31 of the lowermost compartment, air is sequentially fed into the upper compartment through the air blowing opening with the check valve provided in each compartment wall.

On the other hand, in the case of a stack type airbag, at the bottom of the silo, air is first blown from the air blowing port 31 of the uppermost layer to inflate it, and then from the air blowing port 31 of the lower layer airbag. By repeatedly sending air, inflating it, and pushing it up, each airbag is inflated and piled up. [III] Work floor material carry-in: When the airbag becomes sufficiently large in the silo, the work hatch materials such as scaffolding boards are carried into the silo using the inspection hatch 3 on the upper part of the silo. The air bag 30 is already filled in the silo,
These carry-in materials may be placed on the airbag.

[IV] Work Floor Assembly: Airbag 30
Assemble the work materials above to build the work floor. Workers can use this work floor as a scaffold to perform repair work on the top of the silo inner wall. [V] Movement of work floor: When the repair work of the uppermost part of the inner wall of the silo is completed, the air in the uppermost compartment of the airbag 30 is released from the air vent port 32 by opening the opening / closing valve, and the work floor is moved to a predetermined position. It is lowered to the height, and the next silo inner wall repair work is performed. The extent to which the work floor descends depends on the amount of air drawn. If it is necessary to raise the work floor once lowered, air may be sent to the airbag.

In this way, the repair work is carried out while repeating the adjustment of the position of the work floor by successively extracting the air from the airbag 30 in the silo by a predetermined amount in accordance with the progress of the repair work. [VI] Dismantling and unloading of working floor and airbag: When the repair work from the top to the bottom of the silo inner wall is completed, the working floor is dismantled and the working floor material is carried out from the lower hatch 6 to the outside. The airbag 30 is also discharged from the lower hatch 6 after removing the remaining air.

In the embodiment utilizing this air bag, there is an advantage that the cost can be reduced by using the compressor equipped in the silo plant as the air feeding compressor. Other actions and effects are the same as above
This is the same as the embodiment.

[0039]

As described above, according to the method for constructing the working floor in the silo of the present invention, the lightweight hollow body packing is fed into the silo tower body, and the working floor is constructed by using this as a support material. This eliminates the need for a large-scale scaffolding to be built on almost the entire inner surface of the silo, and all the work such as carrying in work floor materials into the silo, carrying out large-scale scaffolding assembly work, dismantling after completion of construction, carrying out, etc. This has the effects of significantly simplifying the process, significantly shortening the construction period, reducing costs, and improving safety.

Further, it is not necessary to perform special processing such as temporary provision of scaffold wall connections or holes on the silo, and the construction quality can be improved. Further, by using rubber balls or plastic balls as the lightweight hollow body filling material, the lightweight hollow body filling material can be loaded and unloaded using the silo main conveyor, and no special setup is required. The effect is obtained.

By using an air bag as the lightweight hollow body filling, the height of the work floor can be easily adjusted by sending air from the compressor to inflate the air bag or operating a valve to remove air. Moreover, there is an effect that the repair work can be easily performed by using the compressor provided in the silo without special setup.

Further, a horizontal holding device is provided on the work floor to keep the work floor horizontal when moving up or down, or a suspending scaffold is provided directly below the silo ceiling opening, and the worker rides on the suspending scaffold to mount the work floor. If it is constructed, the effect of improving work safety can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a silo illustrating an embodiment of a work floor construction method of the present invention.

FIG. 2 is a cross-sectional view illustrating the lightweight hollow body filling material charging step shown in FIG.

FIG. 3 is a sectional view for explaining the work floor assembling process.

FIG. 4 is a diagram for explaining a taking-out process of the lightweight hollow body filling material.

FIG. 5 is a diagram for explaining a carry-out process of a work floor or the like that has been disassembled.

FIG. 6 is a cross-sectional view illustrating a lightweight hollow body filler charging step when the work floor is a donut plate shape.

FIG. 7 is a cross-sectional view of a silo explaining another embodiment of the work floor construction method of the present invention.

FIG. 8 is a cross-sectional view of a silo illustrating an example of a conventional work floor construction method.

FIG. 9 is a partial cross-sectional view of a silo illustrating another example of a conventional work floor construction method.

10 is a view taken along line XX of FIG.

[Explanation of symbols]

 1 Silo Tower Body 2 Opening (Inlet) 3 Opening (Upper Hatch) 5 Outlet 6 Opening (Lower Hatch) 20 Rail 21 Pulley 22 Scaffolding Board Support 23 Lightweight Hollow Body Filling (Plastic Ball) 25 Working Floor 30 Lightweight hollow body filling (airbag)

Claims (6)

[Claims] 1. A method for constructing a working floor that serves as a scaffolding for repairing the inside of a silo tower body, wherein a lightweight hollow body packing is fed into the silo tower body, and a working floor is constructed using the packing material as a support material. A method for constructing a work floor in a silo characterized by: 2. The step of feeding the lightweight hollow body packing into the silo tower body through the opening of the silo tower body, the step of loading the work floor material into the silo tower body, and the step of loading the work floor material into the silo tower body. A step of assembling on top of the packing to form a working floor, and raising and lowering the working floor according to the repair work by adjusting the bulkiness of the lightweight hollow body packing fed into the silo tower body. A method for constructing a work floor in a silo according to claim 1. 3. The method for constructing a working floor in a silo according to claim 1, wherein the lightweight hollow body filling material is a rubber ball or a plastic ball. 4. The lightweight hollow body filling material is composed of an airbag, and the airbag is deflated and carried into the silo tower body, and thereafter, the air is inflated by pressurizing the air in the silo tower body. The method for constructing a work floor in a silo according to claim 1 or 2, wherein the work floor is supported. 5. The method for constructing a work floor in a silo according to claim 1, wherein the work floor is provided with a work floor horizontal holding device. 6. The construction of a work floor in a silo according to claim 1 or 2, wherein a suspension scaffold is provided immediately below a ceiling opening of the silo tower body, and the work floor is constructed by riding on the suspension scaffold. Method.