JP3845492B2 - Inspection method of furnace wall in boiler furnace hopper and construction method of work floor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method for a furnace wall inspection scaffold in a boiler furnace hopper installed in a thermal power plant or the like, and a construction method for a work floor in a boiler furnace hopper.
[0002]
[Prior art]
In this type of boiler, in-furnace inspection scaffolds are assembled and dismantled for boiler inspection work and modification work.
In-furnace inspection scaffolds are divided into suspension type and free-standing type. In either case, the scaffold weight is several tens of tons, so it is necessary to install a supporting structure in the furnace to support the inspection scaffold. is there.
[0003]
In order to assemble this support structure in the boiler furnace hopper, it is necessary to temporarily install 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]
The receiving beam 2 is assembled as a support structure at the furnace bottom of the boiler furnace 1, and the work floor 3 is laid thereon. In-furnace inspection scaffolds are sequentially assembled on the work floor 3 using a lifting device (not shown). In this case, it is necessary to assemble a temporary scaffold on the furnace hopper 4. Although not shown in the drawing, the work floor 3 is provided with an opening for inserting the material inserted into the furnace hopper 4 in order to build an inspection scaffold using the lifting device.
[0005]
The hopper 4 is in the shape of a pyramid. The scaffold log or the scaffold pipe 5 and the scaffold plate 6 are carried into the furnace hopper 4 from the opening at the lower end, and the temporary scaffold is sequentially assembled. 7 is a water pipe, 8 is a water drum.
[0006]
Japanese Patent Laid-Open No. 63-265069 discloses a coal-fired boiler or the like that is lifted up to a predetermined height in the furnace through a furnace bottom opening in a state where the expansion and contraction container is contracted and folded. A furnace in which a fluid is sealed in and the expansion container is expanded and expanded, and then a scaffold plate is placed on the expansion and contraction container, and a work floor (here, a stage) is formed to assemble the scaffold in the furnace. An internal inspection scaffold assembly method is disclosed.
[0007]
[Problems to be solved by the invention]
However, in the temporary scaffold of the furnace hopper 4 shown in FIG. 5 described above, a considerable work period is required for its assembly, and a considerable work period is required for dismantling the temporary scaffold after completion of the construction. Therefore, it greatly affects the entire construction period of assembly or dismantling work of the inspection furnace scaffold. Furthermore, when the worker moves on the temporary scaffold, there is a risk of being caught by the scaffold log binding wire.
[0008]
On the other hand, the temporary scaffold of the support structure disclosed in Japanese Patent Application Laid-Open No. 63-265069 is suspended by lifting metal fittings such as a plurality of wires suspended from the upper part of the furnace, in which an expandable container filled with fluid is suspended. When installing the work floor on this telescopic container, it is unstable because of shaking.
[0009]
In addition, many suspended boilers installed at thermal power plants and the like are of the water tube type, and in this case, it is necessary to also inspect the furnace wall of the furnace hopper. Temporary scaffolds using the above-described telescopic containers are unstable, and are complicated and difficult to perform sufficient inspection.
[0010]
The present invention is intended to solve the above-described problems, eliminates the instability and danger of the temporary scaffolding in the boiler furnace hopper, and is an easy-to-operate construction method for a furnace wall inspection scaffold. The purpose is to provide a construction method for the scaffold and work floor.
[0011]
[Means for Solving the Problems]
In the first invention, a support frame is assembled between inclined surfaces in a boiler furnace hopper, a plurality of erection structures in which a plurality of backbone scaffolds are installed in the height direction are erected in the support frame, and adjacent erection structures The span between them is set to 1900 mm or more, and a plate-like body mainly composed of one or more aluminum materials is integrally passed between the backbone scaffolds of the construction structure. A construction method of a furnace wall inspection scaffold in a boiler furnace hopper, characterized in that a plurality of stages of furnace wall inspection scaffolds are installed in the height direction in support.
[0012]
According to a second aspect of the present invention, a support frame is assembled between inclined surfaces in a boiler furnace hopper, a plurality of installation structures in which a plurality of backbone scaffolds are installed in the height direction are installed in the support frame, and adjacent installation structures The span between them is set to 1900 mm or more, and a plate-like body mainly composed of one or more aluminum materials is integrally passed between the backbone scaffolds of the construction structure. A plurality of stages of furnace wall inspection scaffolds are installed in the height direction in support, and then, a plate-like body mainly composed of one or more aluminum materials is integrally passed between the upper parts of the construction structure. This is a furnace wall inspection scaffold in a boiler furnace hopper and a work floor erection method, wherein a work floor is erected with two points supported by a erection structure.
[0013]
According to the first invention, even if the span between the erected structures is 1900 mm or more, the plate-like body mainly composed of one or more aluminum materials is used, so that the weight is light. A furnace wall inspection scaffolding can be installed with support.
[0014]
According to the second invention, even if the span between the erection structures is 1900 mm or more, the work floor material mainly composed of one or more aluminum plate-like bodies is used, so that the erection structure is lightweight. With the two-point support, the side wall inspection scaffold and work floor can be installed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The form of the Example of this invention is explained in full detail with a figure.
FIG. 1 is a diagram showing an embodiment of the first invention. Here, for easy understanding, the furnace hopper 4 is indicated by a two-dot chain line.
[0016]
In FIG. 1, 9 is a construction structure. An erection structure 9 comprising a horizontal base frame member 10, a vertical column member 11, an oblique column member (inner side) 12a, an oblique column member (outer side) 12b, and a backbone scaffold 13 laid on the horizontal base frame member 10 is a furnace hopper. It is constructed between the inclined surfaces in 4. The span between the erection structures 9 is erected at 1900 mm or more. A furnace wall inspection scaffold 14 spans a plate-like body 15 mainly made of aluminum material between the erected structures 9 and is supported at two points by the adjacent erected structures 9. A pillar 20a is installed on the furnace wall inspection scaffold 14 and a handrail 20 is provided.
[0017]
The erection structure 9 is erected independently between the inclined surfaces in the furnace hopper 4 in four blocks S1 to S4, and a four-stage backbone scaffold 13 is installed in each block.
In FIG. 1, a furnace wall inspection scaffold 14 is installed between blocks S <b> 1 to S <b> 4 where the adjacent fourth-stage backbone scaffold 13 is installed. Although the furnace wall inspection scaffold 14 is also constructed between the blocks S1 to S4 where the backbone scaffolds 13 of other stages are installed, they are omitted in the figure because they become complicated.
[0018]
In the present invention, the span of adjacent erection structures 9 is limited to 1900 mm or more. If the span is less than 1900 mm, the number of erection structures 9 to be erected in the furnace hopper 4 increases, and the erection work takes time. In addition, the work becomes complicated.
[0019]
Scaffolding materials are generally used in many other fields, but in the boiler furnace hopper 4 targeted by the present invention, they are installed on a span of 1900 mm or more of the erection structure 9 with only two-point support of the erection structure 9 It is difficult to apply as a scaffold material for checking the furnace wall from the viewpoint of allowable load and strength.
[0020]
Generally, the scaffold material uses a reinforcing support material at intervals of about 1800 mm.
In the present invention, as described above, since the construction structure 9 is a structure in which a support frame is assembled between inclined surfaces in the boiler furnace hopper 4 and the main scaffold 13 is installed, it is robust. In the present invention, the erected construction structure 9 is used as a support material for the furnace wall inspection scaffold 14.
[0021]
In the present invention, in order to construct the furnace wall inspection scaffold 14 between the construction structures 9 having a span of 1900 mm or more with two-point support by the construction structure 9, one or more aluminum materials are mainly used from the viewpoint of allowable load and strength. The plate-shaped body made as a whole is handed over.
[0022]
The reason for limiting to the plate-like body 15 mainly made of aluminum lumber is that the aluminum lumber is lightweight, easy to process, and has an appropriate strength. Even when the span is 1900 mm or more, the span is limited. Without using a support material between them, it is possible to use the plate-like body 15 having a strength and an allowable load suitable for a scaffold material.
[0023]
The plate-like body 15 can be manufactured with only one piece of aluminum, or two or more pieces can be integrally manufactured by spot welding. Further, the plate-like body 15 can be configured by using a frame body made of steel and a scaffold plate made of aluminum.
[0024]
Moreover, a synthetic plate-like body made of an aluminum material and another lightweight material can also be manufactured. Next, a description will be given of the detachable / fixed plate-like body 15 to which appropriate strength and allowable load are added.
[0025]
FIG. 2 is a view showing an embodiment of an aluminum plate-like body used in the first and second inventions, and FIG. 3 is a side sectional view taken along line AA in FIG.
2 and 3, a furnace wall inspection scaffold 14 is a pair of plate-like bodies 15 formed by bringing two aluminum plate-like bodies 15a and 15b into contact with each other in the width direction, and fixing the upper and lower surfaces thereof from one side. The reinforcing arms 16a and 16b.
[0026]
Here, the bolt holes 17 are provided on the same line in the width direction of the aluminum plate-like bodies 15 a and 15 b, and the aluminum plate-like bodies 15 a and 15 b are fixed by the reinforcing arms 16 a and 16 b via the bolt nut 18. Since the bolts and nuts 18 are used, the aluminum plates 15a and 15b can be easily fixed in a detachable manner by the reinforcing arms 16a and 16b. A base 19 is provided at one end of each of the reinforcing arms 16a and 16b, the reinforcing arms 16a and 16b are fixed, and a column 20a of a handrail 20 is installed on the upper part thereof.
[0027]
The aluminum plate-like bodies 15a and 15b are engaged at right angles to the erection structure 9 by connecting members 21 and supported at two points by using the erection structure 9.
Two aluminum plates 15a and 15b having a width of 300 mm, a thickness of 60 mm, and a length of 4000 mm were used. The allowable load for one sheet is 195 kg, but 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, and thus can be applied as a scaffold member.
[0028]
FIG. 4 shows an embodiment of the second invention. Here, for easy understanding, the furnace hopper 4 is indicated by a two-dot chain line. The same reference numerals are used for portions common to those in FIG.
[0029]
In FIG. 4, an erected structure comprising a horizontal base frame member 10, a vertical column member 11, a diagonal column member (inner side) 12 a, a diagonal column member (outer side) 12 b, and a backbone scaffold 13 laid on the horizontal base frame member 10. 9 is erected. The spanning structure 9 is spanned with a span of 1900 mm or more.
[0030]
The erection structure 9 is erected independently between the four blocks S1 to S4 between the inclined surfaces in the furnace hopper 4, and a four-stage backbone 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 supports a plurality of aluminum plate-like bodies 15 at two points on the upper part of the construction structure.
[0031]
The work floor 25 is installed in the same manner on the blocks S2 and S3, and on the blocks S3 and S4. A furnace wall inspection scaffold 14 is installed between the upper portions of the blocks S2 to S4 where the adjacent fourth-stage backbone scaffolds 13 are installed. The furnace wall inspection scaffold 14 is also constructed between the portions of the blocks S2 to S4 where the other-stage backbone scaffolds 13 are installed. After the work floor 25 is installed, a lifting device or the like (not shown) is installed on the work floor 25, the material is transported from the opening 24, and an in-furnace inspection scaffold or the like is assembled. Reference numeral 22 is an entrance / exit, and 23 is a staircase.
[0032]
【The invention's effect】
As described above, according to the present invention, even if the span between the erected structures is long, a stable furnace wall inspection scaffold and a work floor can be easily erected between the inclined surfaces in the boiler furnace hopper. .
[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.
3 is a side cross-sectional view taken along the line AA in 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]
1 Boiler furnace 2 Receiving beam 3 Work floor (conventional)
4 Furnace hopper 5 Scaffolding pipe 6 Scaffolding plate 7 Water tube 8 Water drum 9 Construction structure 10 Horizontal base frame member 11 Vertical column member 12a Inclined column member (inner side)
12b Oblique column member (outside)
13 Core scaffold 14 Furnace wall inspection scaffold 15 Plate bodies 15a, 15b Aluminum plate bodies 16a, 16b Reinforcement arm 17 Bolt hole 18 Bolt nut 19 Base 20 Handrail 20a Post 21 Connecting member 22 Entrance / exit 23 Stairs 24 Opening 25 Work Floor (according to the invention)
S1-S4 block

Claims (2)

A support frame is assembled between the inclined surfaces in the boiler furnace hopper, and a plurality of erection structures in which a plurality of backbone scaffolds are installed in the height direction are installed in the support frame, and the span between adjacent erection structures is 1900 mm or more. Then, a plate-like body mainly composed of one or more aluminum materials is integrally passed between the backbone scaffolds of the construction structure, and the plate-like body is supported at two points by the construction structure to inspect the furnace wall. A method for constructing a furnace wall inspection scaffold in a boiler furnace hopper, wherein a plurality of scaffolds are constructed in the height direction . A support frame is assembled between the inclined surfaces in the boiler furnace hopper, and a plurality of erection structures in which a plurality of backbone scaffolds are installed in the height direction are installed in the support frame, and the span between adjacent erection structures is 1900 mm or more. Then, a plate-like body mainly composed of one or more aluminum materials is integrally passed between the backbone scaffolds of the construction structure, and the plate-like body is supported at two points by the construction structure to inspect the furnace wall. A plurality of scaffolds are erected in the height direction, and then a plate-like body mainly composed of one or more aluminum materials is integrally passed between the upper parts of the erection structure. A furnace wall inspection scaffold in a boiler furnace hopper and a work floor erection method, wherein the work floor is erected with point support.

Images