JPH1150651A - Extensible scaffold and assembling and disassembling method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembling and disassembling works for scaffolds and execute the cleaning and inspection works for a boiler in a short period and a low cost. SOLUTION: In this extensible scaffolds, columns 2 are formed of extensible units 5 in which bellows-shaped bag bodies are arranged in the extensible sheath pipes and the length of columns can be extended or contracted by charging or discharging an injection material such as water into the bag bodies. When assembling or disassembling the extensible scaffolds, the extensible units 5 of some columns are extended in these plural columns and the rest extensible units of other columns are contracted and in this state, new extensible units 5 are added or extensible units 5 at the lower end part are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic scaffold suitable for working in a small space at an entrance, such as a boiler of a thermal power plant, and a method of assembling and disassembling the scaffold.

[0002]

2. Description of the Related Art Conventionally, boilers of a thermal power plant have been regularly cleaned (for example, once a year) and regularly inspected. When performing work such as cleaning and inspection of a boiler, it is necessary to build a scaffold inside the boiler. However, such a boiler has an internal space of, for example, 9 m in width × 9 m in depth × 30 m in height.
m, whereas the entrance to the interior space is, for example, 0.
It is extremely small, about 4 m × 0.6 m. For this reason, a frame scaffold which is frequently used in construction sites in recent years and can be easily assembled cannot be used, and at present, a scaffold is assembled using a conventional single tube and a clamp.

[0003]

However, in the scaffold using the conventional single pipe as described above, it is needless to say that the assembly and disassembly requires a great deal of time and labor, so that the cost is high, and the cleaning and The inspection will take a long time. In addition, the operation of the boiler must be stopped during cleaning / inspection, which affects the total power generation of the power plant. Therefore, it is desired to reduce the period required for cleaning / inspection. In addition, since the inside of the boiler before cleaning is dark and hot, the working environment is particularly bad when assembling the scaffolding, which makes it difficult for workers, and it is difficult to secure workers. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and makes it easy to disassemble and disassemble a scaffold, and can perform cleaning and inspection of a boiler and the like in a short time and at low cost. It is an object to provide a dismantling method.

[0004]

The invention according to claim 1 is
The telescopic scaffold is configured by integrally connecting a plurality of columns that are driven to expand and contract with a horizontal connecting member, and the column is formed of a telescopic column unit, and the telescopic column unit includes a plurality of sheath tubes having a predetermined length. Are connected so as to be extendable and contractable, and a bellows-like vertically expandable and contractible bag body is disposed in the sheath tube. The bag body is filled with an injecting material such as air or water by an injecting / extracting means. It is characterized in that the entire length is expanded and contracted by extracting.

According to a second aspect of the present invention, there is provided the telescopic scaffold according to the first aspect, wherein the telescopic column units are connected to each other via a connecting metal. In order to connect vertically, in order to connect a lower end portion of the telescopic column unit located above and an upper end portion of the telescopic column unit located below, and a tubular portion for connecting a steel beam or the like, And a plurality of brackets integrally formed on the outer peripheral surface of the bracket.

[0006] The invention according to claim 3 is the invention according to claim 1 or 2.
The telescopic scaffold described above is characterized in that the telescopic scaffold is provided with a suspended scaffold or a suspended stair.

According to a fourth aspect of the present invention, a plurality of extendable telescopic column units are connected in the vertical direction to form a column, and these telescopic column units are connected to each other with a horizontal connecting member to assemble them into a tower. A method for assembling and disassembling a scaffold, the assembling or disassembling the scaffold,
Among the plurality of pillars constituting the scaffold, the telescopic column units constituting the columns are extended in some columns, and the telescopic column units constituting the columns in the remaining columns are contracted, and In this state, in the remaining columns obtained by contracting the telescopic column unit, a new telescopic column unit is added or a telescopic column unit at the lower end is removed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a telescopic scaffold and an assembling / disassembling method thereof according to the present invention will be described below with reference to FIGS. Here, a description will be given of an example in which the telescopic scaffold according to the present invention and the assembling and disassembling method thereof are applied to a scaffold installed in a boiler of a thermal power plant, for example.

As shown in FIGS. 1 and 2, a telescopic scaffold (scaffold) 1 assembled in a boiler has, for example, eight columns 2 arranged in a substantially rectangular shape in plan view, and columns 2, 2 adjacent to each other. Are integrally connected by a beam member (horizontal connecting member) 3 to form a tower having a height of, for example, about 30 m.

Each column 2 has a structure in which a plurality of, for example, five telescopic column units 5 are vertically connected. As shown in FIG. 3, each of the telescopic column units 5 has a configuration in which a bag 7 is accommodated in a sheath tube 6.

The sheath tube 6 is, for example, of a three-stage type and is made of a material such as glass fiber reinforced plastic (GFRP). The sheath tube 6 has a bottomed cylindrical lower tube 6a having an outer diameter of about 0.3 m. A small-diameter medium tube 6b of a predetermined size is also movably accommodated in the vertical direction, and an upper tube 6c having a small diameter of a predetermined size and a closed upper surface is further movably accommodated in the middle tube 6b in the vertical direction. It is a configuration that is housed. And the lower pipe 6a and the middle pipe 6
At the upper end of b, a ridge 8 extending in the circumferential direction is formed on the outer peripheral surface. Also, the middle tube 6b and the upper tube 6c
A stopper ring 9 that engages with the ridge 8 is formed on the inner peripheral surface of the lower end of the stopper ring 9. The projections 8 and the stopper ring 9 prevent the lower tube 6a, the middle tube 6b, and the upper tube 6c from coming off from each other. This sheath tube 6 is shown in FIG.
As shown in FIG. 3A, in a state where the middle tube 6b and the upper tube 6c are accommodated in the lower tube 6a and contracted, the height becomes, for example, about 2 m, and as shown in FIG. From tube 6a to middle tube 6
b, the height is, for example, about 6 m in a state where the upper tube 6c is protruded upward and extended.

As shown in FIG. 4, the bag 7 is made of a flexible and airtight material such as rubber or vinyl-based material, and has a bellows shape or a lantern shape having a circular cross section. It can be expanded and contracted vertically. A metal ring 10 is attached to the outer periphery of the bag 7 at each fold that protrudes toward the outer periphery. As shown in FIGS. 4A and 4B, the bag 7 is filled with an injecting material (here, for example, using water) such as air, water, or oil by a compressor or a pump (not shown). By pulling and pulling out, the user can extend and contract in the vertical direction.

As shown in FIG. 3, the telescopic column unit 5
The full length (height) of the bag 7 is driven to expand and contract by operating the bag 7 housed in the sheath tube 6 using the pressure of the injection material such as water as described above. . At this time, as shown in FIG. 4, since the bag body 7 is provided with the metal ring body 10, it is possible to prevent the bag body 7 from being caught in the sheath tube 6 during expansion and contraction. .

Each of the columns 2 of the telescopic scaffold 1 has a structure in which, for example, five such telescopic column units 5 are connected vertically, as shown in FIG. , 5 are connected by a connection fitting 15. The connection fitting 15 is made of, for example, aluminum formed by casting or the like, and includes a cylindrical portion 16 and a bracket 17 integrally formed on the outer peripheral surface thereof. Insertion holes 16a and 16b for inserting the lower end of the telescopic column unit 5 located above and the upper end of the telescopic column unit 5 located below are formed in the cylindrical portion 16, respectively.
A partition 16c is formed between the insertion holes 16a and 16b. The bracket 17 has a plate-like shape,
For example, a total of eight pieces are formed on the outer peripheral surface of the bracket 17 in a radial manner, and each bracket 17 has a bolt hole 17a so that a steel frame or the like can be connected thereto.

The connection fitting 15 has an insertion hole 16
The upper and lower telescopic column units 5 and 5 are connected to the upper and lower telescopic column units 5 and 5 by inserting the upper and lower telescopic column units 5 and 5 into a and 16b, respectively, and further filling the gap with a silicon material 18. Further, as shown in FIG. 2, the columns 2, 2 adjacent to each other in the telescopic scaffold 1 are connected to the connection fitting 1.
The beam members 3 made of H-shaped steel are connected between the brackets 5 and 15 by attaching bolts (not shown) or the like. The elastic scaffold 1 assembled in a rectangular shape in plan view is further enhanced in its plane rigidity by tensioning a brace 19 made of nylon rope or the like using the bracket 17 of the connection fitting 15. I have. In FIG. 2, what is indicated by reference numeral 20 is a loosening preventing ratchet fitting for applying tension to the brace 19.

Each pillar 2 located at the four corners of the telescopic scaffold 1
A stay 21 projecting outward is attached to the bracket 17 of each connection fitting 15, and a pulley 22 urged (pressed) outward by a spring or the like (not shown) is attached to a tip of the stay 21. It is provided rotatably. In the telescopic scaffold 1, the pulley 22 is pressed against a steam pipe 25 or the like provided at the four corners of the boiler B to support a horizontal load, and when the telescopic scaffold 1 is assembled and disassembled as described later, the steam pipe 2 is used.
5 is used as a guide.

As shown in FIG. 1, in the telescopic scaffold 1 assembled in a tower shape as a whole, a hanging scaffold 26, a hanging staircase (not shown), and the like are provided for work.

(Assembling method) In order to assemble such a telescopic scaffold 1 in the boiler B, first, as shown in FIG.
A predetermined number of, for example, eight telescopic column units 5 are carried in from the entrance into and out of the boiler B, and stand up at a predetermined position on the bottom surface of the boiler B while they are contracted.

Next, these telescopic column units 5, 5,.
The connection fitting 15 is attached to each upper end. Then, as shown in FIG. 7, the beam members 3 are erected between the upper ends of the adjacent telescopic column units 5 and 5 by using the brackets 17 of these connection fittings 15 (see FIG. 5). Furthermore, connection fittings 15, 15, of these telescopic column units 5, 5,.
… Between the braces 19 to reinforce the plane. Also,
As shown in FIG. 2, a stay 21 and a pulley 22 projecting outward are attached to the connection fittings 15 located at the four corners, and the pulley 22 is pressed against a steam pipe 25 (see FIG. 2). Thereafter, a stage (work floor) 30 is installed on the upper surfaces of the telescopic column unit 5 and the beam 3.

Then, as shown in FIG. 8, water is injected by a pump or the like into only the four telescopic column units 5A ₁ , 5A ₁ ,. These are extended, for example, by 2 m. Then, the remaining telescopic column units 5B ₁ , 5B ₁ ,... Float upward because they remain in a contracted state. Therefore the lower end of the expandable column unit 5B ₁ was lifted, newly subjoin the expandable column unit 5B ₂ in the second stage through a connection fitting 15.

Thereafter, as described above, the four corners
Water is injected only into the telescopic column units 5A ₁ , 5A ₁ ,... By a pump or the like, and is further extended by 2 m, thereby connecting the lower end of each telescopic column unit 5B ₂ to the connection fitting 1.
5 through the new annex the expandable column unit 5B ₃ of the third stage.

Next, as shown in FIG. 9, which is 4m extended by injecting water pump or the like to the respective expandable column unit 5B _1. Thus, in the first stage, all the eight telescopic column units 5, 5,. Then, the four telescopic column units 5A ₁ , 5A ₁ ,... Located at the four corners are lifted up, and the second and third telescopic column units 5A ₂ , 5A ₂ , 5
Subjoin the A _3. And the first-stage telescopic column unit 5
A ₁ , 5B ₁ , and second-stage telescopic column units 5A ₂ , 5
At the lower end side of the B _2, respectively, as well as integrating them by bridging the Harizai 3 between the connection fitting 15, achieve a planar reinforcement and stretched bracing 19 as illustrated in FIG. Further, the pulleys 22 are attached to the connection fittings 15 located at the four corners, and pressed against the steam pipe 25.

Then, the eight telescopic column units 5 in the second stage
Water is injected into all of A ₂ and 5B ₂ by a pump or the like, and these are extended by 4 m. Thus, all the telescopic column units 5, 5,... In the second stage are in an extended state.

Thereafter, the first-stage telescopic column unit 5
First, in the telescopic column unit 5 at the third stage, the telescopic column units 5A ₃ , 5A ₃ ,.
Is extended, and a new 4 is added to the lower end of each of the remaining telescopic column units 5B ₃ , 5B ₃ ,.
The first and fifth telescopic column units 5 and 5 are sequentially added.
Subsequently, the third telescopic column units 5B ₃ , 5B ₃ ,.
, and the fourth and fifth-stage telescopic column units 5 and 5 are newly added to the lower end portions of the telescopic column units 5A ₃ , 5A ₃ ,... Thereby, all the telescopic column units 5, 5,
Are in an extended state. Further, as shown in FIG. 2, on the lower end side of the third-stage and fourth-stage telescopic column units 5, the beam members 3 are respectively bridged between the connection fittings 15 to integrate them, and A brace 19 is stretched to reinforce the plane. Further, the pulleys 22 are attached to the connection fittings 15 located at the four corners, and pressed against the steam pipe 25.

Thereafter, water is sequentially injected into the eight telescopic column units 5 at the fourth and fifth stages to extend them. As a result, as shown in FIG. 1, each column 2 is in a state in which the tower-shaped telescopic scaffold 1 composed of five-stage telescopic column units 5 is assembled. After attaching the hanging stairs, etc., the inside of the boiler B is cleaned and inspected.

(Dismantling method) In addition, cleaning and cleaning inside boiler B
After the completion of the inspection work, when disassembling the telescopic scaffold 1, the work may be performed in a procedure reverse to the procedure for assembling the telescopic scaffold 1.

In the telescopic scaffold 1 described above, each column 2 is composed of a telescopic column unit 5, and each telescopic column unit 5 has a bellows-like bag 7 disposed in a telescopic sheath tube 6. Body 7
The entire length of each column 2 is expanded and contracted by injecting and extracting an injection material such as water. In this way, by using the telescopic column unit 5, the telescopic scaffold 1 can be assembled and disassembled very efficiently as compared with the conventional case using a single-tube scaffold. Thereby, the elastic scaffold 1
The time required for disassembly and disassembly of the boiler B can be greatly reduced, the period for cleaning and inspecting the boiler B can be shortened, and the cost can be reduced. Further, the period for stopping the operation of the boiler B can be minimized.

Moreover, such a telescopic column unit 5 has a height of 2 m in a contracted state and is very compact, so that it can be inserted into and out of the boiler B having a small entrance and exit without any trouble. Further, the telescopic drive unit of the telescopic column unit 5 is water or the like, and there is no need to bring in various driving parts such as a hydraulic jack and a ball screw, for example.
Moreover, when the filler such as water is removed, the telescopic column unit 5
Since the sheath tube 6 may be made of GFRP and is very lightweight, it can be easily handled.

The connection of the telescoping column units 5 is performed by using the connection fittings 15, and each of the connection fittings 15 has a cylindrical portion 16 for connecting the expansion and contraction column units 5, 5 in the vertical direction.
And bracket 1 for connecting beam 3 and brace 19
7 are integrally formed. Thereby, even in the dark boiler B, the connection of the telescopic column unit 5 and the assembly and disassembly of the telescopic scaffold 1 can be performed easily and reliably.

Further, pulleys 22 protruding outward are attached to the connection fittings 15 located at the four corners of the telescopic scaffold 1.
The pulley 22 is configured to be pressed against steam pipes 25 provided at four corners of the boiler B. Thereby, the telescopic scaffold 1 can be restrained in the horizontal direction.
In addition, when the telescopic column unit 5 expands and contracts, the pulley 22 and the steam pipe 25 serve as guides, so that the telescopic operation can be performed smoothly and reliably.

In the method for assembling and disassembling the extensible scaffold 1 described above, when assembling or disassembling the extensible scaffold 1, the extensible column unit 5 is extended on some of the plurality of columns 2 and The telescopic column unit 5 is contracted in the remaining columns 2, and in this state, a new telescopic column unit 5 is added or the telescopic column unit 5 at the lower end is removed. This allows
The telescopic scaffold 1 can be easily assembled or disassembled.
In addition, since the extension of the telescopic column unit 5 or the removal of the telescopic column unit 5 at the lower end can be performed at a low place in the boiler B, the work at a high place is reduced, and the safety of the work is improved. be able to.

In the above-described embodiment, other configurations can be appropriately adopted without departing from the gist of the present invention. For example, the sheath tube 6 of the telescopic column unit 5
Is expanded and contracted in three steps, but may be two or four or more steps. The material of the sheath tube 6 is also
A material other than FRP may be used, but a lighter material is desirable for the purpose. Further, the shape and the material of the bag body 7 are not limited as long as the bag body 7 expands and contracts in the vertical direction. Other materials such as a gelling material and a sol-forming material may be used.
Furthermore, for example, the water or the like may be frozen in a state where the telescopic column unit 5 is extended by injecting water or the like into the bag body 7. With such a configuration, the telescopic scaffold 1
And the stability can be improved. Also,
Although each column 2 has a configuration in which, for example, five telescopic column units 5 are vertically connected, the number of telescopic column units 5 may be more or less than that.

Furthermore, it goes without saying that the shape of the telescopic scaffold 1 itself can be other than the above. For example, as shown in FIG. 10, for example, pillars 2 composed of telescopic pillar units 5 are erected at five places at four corners and a central part, and a beam member 3 is erected substantially in an X shape between these pillars 2, and on the outer peripheral side. A brace 19 may be stretched between the pillars 2 and 2 located. In addition to the above, the same configuration as described above can be applied to scaffolds having other shapes without being limited to those having a rectangular shape in plan view. In addition, a scaffold plate or a floor plate may be appropriately provided in the middle of the telescopic scaffold 1.

In addition, such a telescopic scaffold 1 is not limited to the above-mentioned boiler B of a thermal power plant, but may be applied to, for example, narrow water and holes, and other construction sites of ordinary buildings. Therefore, the same effect as described above can be obtained.

In addition, as for the method of assembling and disassembling the telescopic scaffold 1, a procedure other than the procedure described above may be used.

Other than this, any configuration may be adopted as long as it does not depart from the gist of the present invention, and it is needless to say that the above-described configurations may be appropriately combined selectively. No.

[0037]

As described above, according to the telescopic scaffold according to the first aspect, the columns constituting the telescopic scaffold are composed of telescopic column units, and each telescopic column unit is provided with a bellows-like shape inside a telescopic sheath tube. In this configuration, a bag body that is vertically expanded and contracted by filling and extracting a fluid such as air or water is provided. In this way, by using the telescopic column unit, the scaffold can be efficiently assembled and dismantled,
Thereby, it is possible to shorten the construction period of the entire operation using the scaffold and to reduce the cost. Therefore, even when this scaffold is used for cleaning and inspection of the boiler, the boiler operation stop period can be minimized, and the scaffold can be easily and reliably assembled even in a dark boiler. Become. In addition, since such a telescopic column unit is very compact in a contracted state, it can be particularly suitably used even when the entrance is small. In addition, the driving source of the expansion and contraction operation is air, water,
Since it is oil and the like, it is not necessary to bring in large-scale parts and the like, and since it becomes very light when air, water, oil, etc. are removed, it is easy to handle.

According to the second aspect of the present invention, the connecting fitting has a tubular portion for vertically connecting the telescopic column unit and a bracket for connecting a steel beam or the like. ing. Thus, the scaffold can be easily disassembled and disassembled, and the work can be performed smoothly even in a dark boiler or the like.

According to the method of assembling and disassembling the scaffold according to the fourth aspect, when assembling or disassembling the scaffold, the telescopic pillar unit is extended in some of the plurality of pillars constituting the scaffold, In the remaining columns, the telescopic column unit is in a contracted state, and in this state, a new telescopic column unit is added or the telescopic column unit at the lower end is removed. Thereby, claim 1
Assembly and disassembly of the telescopic scaffold according to any one of (3) to (3) can be easily performed. Furthermore, work at high places can be reduced, which can contribute to work safety.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a telescopic scaffold according to the present invention and a scaffold configured by applying the assembling and disassembling method thereof.

FIG. 2 is a plan sectional view of the scaffold.

FIG. 3 is a sectional view showing a telescopic column unit constituting the scaffold, and is an elevational sectional view showing (a) a state in which the unit is contracted and (b) a state in which the unit is extended.

FIG. 4 is a vertical sectional view showing a bag provided in the telescopic column unit.

FIG. 5 is an elevation view and a plan sectional view showing a connection fitting used for connecting the telescopic column unit.

FIG. 6 is a view showing a method of assembling and disassembling the scaffold,
It is a perspective view showing the state where the first-stage telescopic pillar unit was set up.

FIG. 7 is a perspective view showing a state where the telescopic column units are connected to each other.

FIG. 8 is a perspective view showing a state where only a part of the telescopic column unit is extended.

FIG. 9 is a perspective view showing a state where another unit of the telescopic column unit is extended.

FIG. 10 is a cross-sectional plan view showing another example of a telescopic scaffold according to the present invention and a scaffold to which the method of assembling and disassembling the scaffold is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Telescopic scaffold (scaffold) 2 Column 3 Beam material (horizontal connecting material) 5 Telescopic column unit 6 Sheath tube 7 Bag 15 Connection fitting 16 Tubular part 17 Bracket

Claims (4)

[Claims] 1. A telescopic scaffold is constructed by integrally connecting a plurality of columns that are driven to expand and contract with a horizontal connecting member, wherein the columns comprise telescopic column units, and the telescopic column units have a predetermined length. The plurality of sheathed tubes are extendably connected to each other, and a bellows-like vertically expandable bag is disposed in the sheaths, and the bag is filled with an injectable material such as air or water. A telescopic scaffold characterized in that the entire length thereof is configured to expand and contract by being injected and withdrawn by a withdrawing means. 2. The telescopic scaffold according to claim 1, wherein the telescopic column units are connected to each other via a connecting metal. The connecting metal connects the telescopic column units in a vertical direction. In order to connect a lower end portion of the telescopic column unit located above and an upper end portion of the telescopic column unit located below and a steel beam, an outer peripheral surface of the cylindrical portion is integrally formed. A telescopic scaffold comprising a plurality of formed brackets. 3. The telescopic scaffold according to claim 1, wherein a hanging scaffold or a hanging stair is provided on the telescopic scaffold. 4. A method of assembling and disassembling a scaffold which is constructed by connecting a plurality of extendable telescopic column units in a vertical direction to form a column, and further connecting these telescopic column units with a horizontal connecting member to assemble them into a tower shape. At the time of assembling or disassembling the scaffold, of the plurality of pillars constituting the scaffold, the telescopic pillar unit constituting the pillar is extended in some pillars, and the pillar is constituted in the remaining pillars In this state, the telescopic column unit is contracted, and in this state, in the remaining columns in which the telescopic column unit has been contracted, a new telescopic column unit is added or the telescopic column unit at the lower end is removed. Assembling and dismantling method of scaffold.