JPH10331415A - Furnace wall inspection scaffolding in boiler fire pit hopper and construction method of working floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a furnace wall inspection scaffolding to facilitate the scaffolding construction and to eliminate riskiness by constructing a plurality of construction structural bodies having span with specific length between inclined planes in a boiler fire pit hopper, and laying a plate-like body having an aluminum material as a main body between construction structural bodies. SOLUTION: A construction structural body 9 constituted of a horizontal base frame member 10, a vertical column member 11, inclined column members 12a and 12b and basic scaffoldings 13 laid on the horizontal base frame member 10 is constructed between inclined planes in a fire pit hopper 4, and it is used for a bearing member of furnace wall inspection scaffoldings 14. Span between the construction structural bodies 9 is longer than 1900 mm in order to shorten a construction period of time to simplify work. A plate-like body 15 having a lightweight aluminum material capable of being easily machined as a main body is laid between the construction structural bodies 9, and two points are borne on the adjacent construction structural body 9. By using the aluminum material, the plate-like body 15 having strength applicable to scaffolding materials and allowable load without using the bearing member even if span is longer than 1900 mm. By the constitution, unstableness and riskiness of a construction scaffolding are eliminated, and the construction of a scaffolding can be easily carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for erection of a furnace wall inspection scaffold in a boiler furnace hopper and a method for erection of a work floor in a boiler furnace hopper installed in a thermal power plant or the like.

[0002]

2. Description of the Related Art In a boiler of this type, a scaffold for inspection inside a furnace is assembled and dismantled for inspection work or remodeling work of the boiler. Inspection scaffolds in the furnace are classified into hanging type and self-supporting type.In each case, it is necessary to install a supporting structure to support the inspection scaffold in the furnace because the scaffold weight is several tens tons. is there.

In order to assemble this support structure in a boiler furnace hopper, it is necessary to temporarily provide a scaffold for assembling the support structure. An example of a temporary scaffold for assembling a support structure in a boiler furnace hopper which is generally performed will be described with reference to FIG.

[0004] A receiving beam 2 is assembled as a support structure on the bottom of the boiler furnace 1, and a work floor 3 is laid thereon. Work floor 3
, A furnace inspection scaffold is sequentially assembled using a lifting device (not shown). In this case, it is necessary to form a temporary scaffold on the furnace hopper 4. Although not shown, the work floor 3 is provided with an opening for inserting the material inserted into the furnace hopper 4 onto the work floor 3 in order to build an inspection scaffold using a lifting device.

The hopper 4 has a pyramid shape, and a scaffold log or a scaffold pipe 5 and a scaffold plate 6 are carried into the furnace hopper 4 from the opening at the lower end, and a temporary scaffold is sequentially assembled.
7 is a water pipe, 8 is a water drum.

Japanese Patent Application Laid-Open No. 63-265069 discloses a coal-fired boiler or the like in which a telescopic container is shrunk to a predetermined height in a furnace through an opening at the bottom of the furnace in a state where the telescopic container is contracted and folded. A fluid is sealed in the container, and the telescopic container is expanded and expanded. Then, a scaffold plate is placed on the expanded and expanded telescopic container, and a work floor (here, a stage) is formed to assemble the scaffold in the furnace. A method for assembling a scaffold for inspection in a furnace is disclosed.

[0007]

However, the temporary scaffold of the furnace hopper 4 shown in FIG. 5 requires a considerable period of time for assembling, and the dismantling of the temporary scaffold after the completion of the construction requires a considerable period of time. It costs. For this reason, it greatly affects the overall construction period of the assembling or dismantling of the inspection scaffold in the boiler furnace. Furthermore, when the worker moves on the temporary scaffold, there is a risk that the worker may get caught on the scaffolding log binding wire.

On the other hand, a temporary scaffold of the support structure disclosed in Japanese Patent Application Laid-Open No. 63-265069 is constructed such that a telescopic container filled with fluid is suspended by a plurality of wires or the like hanging from the upper part of a furnace. Is done. When the work floor is set on this telescopic container, it shakes and is unstable.

In addition, many of the suspended boilers installed in thermal power plants and the like are of the water tube type. In this case, it is necessary to inspect the furnace wall of the furnace hopper together. Temporary scaffolds using the above-mentioned telescopic container are unstable and complicated, and it is difficult to perform sufficient inspection and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an instability and danger of a temporary scaffold in a boiler furnace hopper is eliminated, and a furnace wall inspection scaffold with easy workability is provided. It is an object of the present invention to provide an erection method and a method of erection of a scaffold and a work floor.

[0011]

According to a first aspect of the present invention, a plurality of erection structures having a base frame and a support frame are installed between inclined surfaces in a boiler furnace hopper, and a span between adjacent erection structures is reduced. 1900 mm or more, one or more plate-shaped objects mainly made of aluminum material are integrally bridged between the erected structures, and the plate-shaped members are supported at two points by the erected structures to provide a furnace wall inspection scaffold. A method of erection of a scaffold for inspecting a furnace wall in a boiler furnace hopper, characterized by erection.

In the second invention, a plurality of erection structures having a support frame and a main scaffold are installed between inclined surfaces in a boiler furnace hopper, and a span between adjacent erection structures is set to 1900.
mm or more, one or more plate-shaped bodies mainly made of aluminum material are integrally bridged between the erected structures, and the plate-shaped bodies are supported at two points by the erected structures to provide a furnace wall inspection scaffold. Then, one or more plate-shaped bodies mainly made of aluminum material are integrally bridged between the upper parts of the built-up structure, and the work floor is erected by supporting the plate-shaped bodies at two points with the structure. A method of erection of a scaffold and a work floor for inspection of a furnace wall in a boiler furnace hopper, characterized in that:

According to the first aspect of the present invention, even if the span between the erection structures is 1900 mm or more, the erection structure is lightweight because one or more aluminum plates are used as the main body. Thus, a scaffold for inspecting the furnace wall can be erected by two-point support.

According to the second aspect of the present invention, even if the span between the erection structures is 1900 mm or more, since the work floor material mainly composed of one or more aluminum plate-like members is used, it is light in weight. The side wall inspection scaffold and the work floor can be erected by the erection structure by two-point support.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the first invention. Here, the furnace hopper 4
Is indicated by a two-dot chain line.

In FIG. 1, reference numeral 9 denotes a bridge structure. A furnace hopper comprises a erection structure 9 including a horizontal base frame member 10, a vertical column member 11, a sloping column member (inside) 12 a, a sloping column member (outside) 12 b, and a main scaffold 13 laid on the horizontal base frame member 10. 4 between the inclined surfaces. The span between the erection structures 9 is set to 1900 mm or more. Reference numeral 14 denotes a furnace wall inspection scaffold, which bridges a plate-like body 15 mainly made of aluminum material between the erection structures 9 and supports two points by adjacent erection structures 9. On the furnace wall inspection scaffold 14, a support 20a is installed and a handrail 20 is provided.

The erection structure 9 is independently erected in four blocks S1 to S4 between the inclined surfaces in the furnace hopper 4, and a four-stage basic scaffold 13 is installed in each block. In FIG. 1, a furnace wall inspection scaffold 14 is erected between blocks S <b> 1 to S <b> 4 on which the adjacent fourth-stage main scaffold 13 is installed. The furnace wall inspection scaffold 14 is also installed between the blocks S1 to S4 where the main scaffolds 13 of the other stages are installed, but they are omitted in the figure because they are complicated.

In the present invention, the span of the adjacent erection structure 9 is limited to 1900 mm or more because the span is 1
If it is less than 900 mm, the number of the erection structures 9 to be erected in the furnace hopper 4 increases, which requires more time for erection work and complicates the work.

Although scaffolding materials are generally used in many other fields, the two-point support of the erection structure 9 within the span of 1900 mm or more of the erection structure 9 in the boiler furnace hopper 4 to which the present invention is applied. As a scaffold for furnace wall inspection to be installed only by itself, it is difficult to apply it as it is from the viewpoint of allowable load and strength.

Generally, a scaffold uses a reinforcing support material at intervals of about 1800 mm. In the present invention, as described above,
The erection structure 9 is robust because it is a structure in which a support frame is provided between inclined surfaces in the boiler furnace hopper 4 and a main scaffold 13 is installed. In the present invention, the rigidly erected structure 9 is used as a support for the furnace wall inspection scaffold 14.

In the present invention, since the furnace wall inspection scaffold 14 is erected at two points by the erection structure 9 between the erection structures 9 having a span of 1900 mm or more, one or more sheets of aluminum are required from the viewpoint of allowable load and strength. A plate-shaped body mainly made of lumber is integrally transferred.

The reason why the plate member 15 mainly made of aluminum material is limited is that the aluminum material is lightweight, easy to process, and
It focuses on having an appropriate strength, and even when the span is 1900 mm or more, it can be used as a plate-like body 15 having strength and allowable load suitable for a scaffold without using a supporting material between the spans. .

The plate 15 can be made of only one piece of aluminum, or two or more pieces can be made integrally by spot welding. Further, the plate-like body 15 may be formed by using a frame body made of steel and a scaffold plate made of aluminum.

Also, a composite plate made of aluminum and another lightweight material can be manufactured. Next, a description will be given of the detachable fixed plate-shaped body 15 to which an appropriate strength and an allowable load are added.

FIG. 2 is a view showing an embodiment of an aluminum plate used in the first and second inventions, and FIG.
FIG. 4 is a side sectional view taken along line A of FIG. 2 and 3, the furnace wall inspection scaffold 14 has two aluminum plate-like members 15a,
And a pair of reinforcing arms 1 for fixing the plate-like body 15 formed by bringing the upper and lower surfaces into contact with each other from one side.
6a and 16b.

Here, bolt holes 17 are provided on the same line in the width direction of the aluminum plate-like members 15a, 15b, and the aluminum plate-like members 15a, 15b are fixed by the reinforcing arms 16a, 16b via bolt nuts 18. . Since the bolt and nut 18 are used, the fixing of the aluminum plate-like bodies 15a and 15b by the reinforcing arms 16a and 16b can be easily and detachably performed. A base 19 is provided at one end of each of the reinforcing arms 16a and 16b, and the reinforcing arms 16a and 16b are fixed, and a support 20a of the handrail 20 is installed above the base.

The aluminum plate-like members 15a and 15b have both ends engaged at right angles to the bridge structure 9 by connecting members 21, and are supported at two points by using the bridge structure 9. Commercially available 300 mm wide x 60 m thick aluminum plate-like bodies 15a and 15b
Two pieces of mx 4000 mm in length were used. Although the allowable load of one sheet is 195 kg, according to the first and second inventions, the allowable load can be used as 390 kg. That is, the strengths of the aluminum scaffold members 15a and 15b interact with each other and function as double strength, so that the scaffold members can be applied.

FIG. 4 is a diagram showing an embodiment of the second invention. Here, the furnace hopper 4
Is indicated by a two-dot chain line. 1 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 4, a horizontal base frame member 10, a vertical column member 11, a diagonal column member (inside) 12a, a diagonal column member (outside) 12b, and a main scaffold 13 laid on the horizontal base frame member 10. An erection structure 9 is erected. The erection structure 9 is erected with a span of 1900 mm or more.

Further, the erection structure 9 is independently erected in four blocks S1 to S4 between the inclined surfaces in the furnace hopper 4, and a four-stage basic scaffold 13 is installed in each block. A plurality of aluminum plate-like bodies 15 are stretched over the blocks S1 and S2 to form a work floor 25. That is, the work floor 25 includes a plurality of aluminum plate-like bodies 1.
5 is supported at two points at the top of the erection structure.

The work floor 25 is similarly installed on the blocks S2 and S3, and on the blocks S3 and S4 in the same manner. A furnace wall inspection scaffold 14 is erected between the upper portions of the blocks S2 to S4 in which the adjacent fourth-stage basic scaffold 13 is installed. Furnace wall inspection scaffolds 14 are also erected between the blocks S2 to S4 where the core scaffolds 13 of the other stages are installed, but they are omitted in the figure because they are complicated. Work floor 2
After the bridge 5 is erected, a lifting device or the like (not shown) is installed on the work floor 25, the material is conveyed from the opening 24, and an in-furnace inspection scaffold and the like are assembled. Reference numeral 22 denotes an entrance and 23 denotes a stair.

[0032]

As described above, according to the present invention, even if the span between the erection structures is long, a stable furnace wall inspection scaffold between inclined surfaces in a boiler furnace hopper and a work floor can be easily provided. Can be erected.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the first invention.

FIG. 2 is a plan view showing an embodiment of an aluminum plate used in the first and second inventions.

FIG. 3 is a side sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view showing an embodiment of the second invention.

FIG. 5 is a perspective view showing an example of a temporary scaffold for a conventional boiler furnace hopper.

[Explanation of symbols]

 Reference Signs List 1 boiler furnace 2 receiving beam 3 work floor (conventional) 4 furnace hopper 5 scaffold pipe 6 scaffold plate 7 water pipe 8 water drum 9 erection structure 10 horizontal base frame material 11 vertical column member 12a diagonal column member (inside) 12b diagonal column member (Outside) 13 Main scaffold 14 Fire wall inspection scaffold 15 Plate 15a, 15b Aluminum plate 16a, 16b Reinforcement arm 17 Bolt hole 18 Bolt nut 19 Base 20 Handrail 20a Strut 21 Connection member 22 Doorway 23 Step 24 Opening Part 25 Work floor (according to the invention) S1 to S4 block

Claims (2)

[Claims] 1. A plurality of erection structures in which a support frame is installed between inclined surfaces in a boiler furnace hopper and a main scaffold is installed, and a span between adjacent erection structures is set to 1900 mm or more. A boiler furnace, wherein one or more plate-shaped members mainly made of aluminum are interposed therebetween, and the plate-shaped member is supported at two points by a erection structure to form a furnace wall inspection scaffold. Construction method of scaffold for inspection of furnace wall in hopper. 2. A erection structure comprising a plurality of erection structures having a support frame interposed between inclined surfaces in a boiler furnace hopper and a main scaffold installed thereon, and a span between adjacent erection structures being 1900 mm or more. At least one plate-shaped body mainly made of aluminum material is interposed therebetween, and the plate-shaped body is supported at two points by a erection structure, and a furnace wall inspection scaffold is erected. A boiler furnace hopper characterized in that one or more plate-shaped members mainly made of aluminum material are integrally wound therebetween, and the plate-shaped members are supported at two points by a erection structure to construct a work floor. Construction method of scaffolding and work floor for furnace wall inspection inside.