JP2011080668A - Scaffold structure for boiler furnace interior work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scaffold structure for boiler furnace interior work, which promptly and easily installs a scaffold within a furnace, shortens the entire process of periodic inspection while reducing costs. <P>SOLUTION: An insertion beam 4 constituted of an H beam serving as a support beam of a framework scaffold 8 is nipped between guide beams 5 constituted of two C beams. The insertion beam 4 in the waiting state outside the furnace during storage is delivered to the inside of the furnace 1 when used, and the insertion beam 4 and the guide beam 5 are fastened and fixed to each other outside the furnace 1, so as to provide a structure in which a cantilever beam is protruded within the furnace 1. Thus, the scaffold can be temporarily built within the furnace 1 easily and promptly. Since the insertion beam 4 constituted of the single H beam does not require addition of a member to secure an insertion length to the inside of the furnace 1, work for inserting the insertion beam 4 to the inside of the furnace 1 is extremely easy. A working space can be secured promptly in a position close to a hanging heat exchanger provided within the furnace 1 to transfer to clinker removal work, shortening the process. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a boiler furnace work scaffold structure for temporarily installing a maintenance scaffold in a boiler furnace.

In a large-scale boiler for thermal power generation, it is necessary to periodically check the inside of the boiler furnace and remove the clinker adhering to the furnace wall of the boiler furnace and the heat exchanger disposed in the furnace.
The height of the large boiler is, for example, about 20 m from the bottom of the furnace to the hopper, about 40 m from the hopper to the middle above the hopper, and a suspended heat exchanger above the middle The height of the area to be formed is as high as about 20 to 25 m. For this reason, a base portion is provided at a key point of the boiler, and a frame scaffold is installed on the base portion.

When working inside the furnace, first attach it to the heat exchanger or furnace wall in advance before assembling the scaffolding on the lower side of the furnace so that clinker etc. attached to the upper heat exchanger and furnace wall do not fall The clinker must be removed.
For this reason, after cooling in the boiler furnace has been completed, conventionally, a method has been employed in which a water jet is blown from a furnace opening (manhole) to remove clinker adhering to the heat exchanger and the furnace wall.

In recent years, operation with multiple coal types has been increasing for cost reduction, and as a result, the use ratio of coal types with low ash softening temperature has increased, the generation of clinker in the furnace has been promoted, and the removal work time has increased due to the increase in the amount of clinker There is a tendency.
It takes a very long time to install a temporary scaffold from the bottom of the boiler furnace, and in order to increase the operating rate of the power plant, it is required to shorten the entire periodic inspection process. The shortening of the process is an important issue because it leads to cost reduction of the periodic inspection itself.
Japanese Utility Model Laid-Open No. 5-3481 and Japanese Patent Laid-Open No. 9-280537 disclose a method of installing a scaffold in the form of a beam spanning the furnace wall before and after the boiler in the middle part of the boiler furnace.

Japanese Utility Model Publication No. 5-3481 JP-A-9-280537

  According to the upper scaffold for inspection in the boiler furnace described in Patent Document 1, the scaffold beam is passed over the upper inclined portion of the water tube nose while the temperature in the boiler furnace is lowered to a temperature at which an operator can perform the inspection. In addition, since the upper scaffold for inspection is assembled based on the suspended scaffolding beam, it is possible to shorten the boiler operation stop time and greatly reduce the assembly time of the inspection scaffold. It has the effect of being able to quickly deal with troubles such as inspection and repair of heaters and steam leakage.

  However, when the water jet is blown from the furnace opening (manhole) toward the suspended heat exchanger, the clinker cannot be completely removed due to the long distance and the complicated shape of the heat exchanger. There is also. In order to remove the clinker with certainty, approach as close to the heat exchanger as possible, and in addition to water jet, mechanically and physically (for example, hitting and striking with pipes, rods, etc.) It is desirable to remove it.

According to the method described in Patent Document 2, since a horizontal beam insertion device that horizontally inserts a beam from one side to the opposite side through a manhole in the furnace wall, the work can be performed while viewing the progress of the beam from the beam insertion side. Work can be done without interfering with built-in objects (superheater, etc.), a constant speed can be ensured, and shaking can be minimized. There is an effect that the speed can be freely adjusted without damaging the superheater or the like.
However, since the space between the front and rear furnace walls in a large boiler is wide, it is not easy to pass or assemble long beams.

  An object of the present invention is to provide a scaffold structure for working in a boiler furnace that can quickly and easily install a scaffold in the furnace, shorten the entire periodic inspection process, and reduce the cost.

The above-mentioned problem of the present invention is solved by the following means.
The invention described in claim 1 is a working structure in a boiler furnace for performing work in a furnace for use in an inspection inside the furnace of a boiler for thermal power generation, and is provided on a support provided outside the furnace. A guide beam constructed by supporting and fixing two C-shaped steel members having a web portion and upper and lower flange portions, with the web portions spaced apart from each other in a back-to-back manner, a web portion and upper and lower portions thereof It consists of a single H-section steel with a flange, and is sandwiched between the two C-section webs that make up the guide beam. The whole is located outside the furnace in the retracted state, and the furnace opening in the used state It is composed of an insertion beam that is slidably provided so as to be inserted into the furnace through the part, and the guide beam is provided with a fastening hole for fixing the insertion beam with a fastening member at both ends in the longitudinal direction, A part of the insertion beam has a longitudinal direction At least one fastening hole for fixing the guide beam to the guide beam with the fastening member is provided at one end near the outside of the furnace, and the insertion beam and the guide beam are inserted into the furnace for use. One set is used to transmit the weight of the insertion beam and the load of the scaffold structure disposed in the furnace that the insertion beam receives to the guide beam through the fastening portion that is located outside the furnace and is fastened by the fastening member through the fastening hole. This is a boiler furnace working scaffold structure characterized in that a plurality of sets of the scaffold structures are arranged on the side wall of the front side of the furnace in the furnace width direction.

  According to a second aspect of the present invention, a scaffold installation pipe and a gantry support are attached on the upper flange of the insertion beam positioned in the furnace in a state where a part of the insertion beam is inserted into the furnace. The boiler scaffold working structure according to claim 1, wherein:

(Function)
In the present invention, an insertion beam of H-shaped steel, which serves as a support beam for various scaffolds, is sandwiched between two C-shaped steel guide beams, and the insertion beam that is in a standby state outside the furnace during storage is fed into the furnace when in use. Both are fastened and fixed outside, and a cantilever beam extends over the furnace.
Inserting a plurality of insertion beams arranged in accordance with the distance between the height of the heat exchanger in the furnace and the total length of the scaffolding plate (for example, 1524 mm and 1824 mm of commercial products) from the front side of the furnace (can) through the manhole provided on the furnace wall, Scaffolding boards can be installed on them.

  According to the first aspect of the present invention, when a part of the insertion beam is inserted into the furnace and used, the weight of the insertion beam and the insertion beam are passed through the fastening portion between the insertion beam and the guide beam located outside the furnace. Since the set of scaffolding structures is formed so as to transmit the load of the scaffolding structure disposed in the furnace to the guide beam, the scaffolding can be temporarily and easily installed in the furnace. In addition, since the insertion beam made of a single H-shaped steel does not add a member to ensure the insertion length into the furnace, the operation of inserting the insertion beam into the furnace is very easy. In the position close to the suspended heat exchanger, the work space can be quickly secured and the clinker removal work can be carried out, so that the process can be shortened.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, when the insertion beam is inserted into the furnace, the scaffold is installed on the upper flange of the insertion beam located in the furnace. A frame scaffold for working in the furnace can be temporarily and easily provided by hooking a hook such as a scaffold plate on the pipe and attaching the mount to the mount support.

1 is an overall elevation view of a large boiler in which an in-furnace scaffolding structure according to an embodiment of the present invention is installed. FIG. 2 is a perspective view of a structure in which an H-shaped steel is sandwiched before and after by a C-shaped steel that is a main structure of the in-furnace scaffolding structure of FIG. It is a detailed side view of the main structure of the in-furnace scaffold structure of FIG. It is an AA arrow directional view of FIG.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, an opening (manhole) 2 is formed in the side wall of the boiler furnace 1, and a suspended heat exchanger 3 and the like are disposed therein. Also, as shown in FIGS. 1 and 2, at least two portal-type columns 9 are joined to a boiler support frame structural member (not shown) provided outside the boiler furnace 1 by welding or bolts, and at least 2 The guide beam 5 is stretched around the support column 9 and fixed. The guide beam 5 is formed by arranging two C-shaped steel members composed of flanges 5a and 5b having a horizontal plane on the top and bottom and a web 5c having a plane in the vertical direction with the webs 5c back to back with a predetermined interval. It is configured to be joined to the two gate-shaped columns 9.

  The insertion beam 4 made of H-shaped steel is sandwiched between the two webs 5c of the two guide beams 5 made of C-shaped steel, and the insertion beam 4 is inserted into the furnace through the opening (manhole) 2 on the side wall of the furnace 1 It is a configuration that can be done. As shown in FIGS. 3 and 4, a pair of upper and lower support members 6, which are supported by two portal-type columns 9 in parallel with the guide beams 5, around the guide beams 5 made of a pair of C-shaped steels. 7 is provided. A support roller 10 is attached to the lower surface of the upper support member 6, and a roller-type driving device 11 is attached to the upper surface of the lower support member 7 so that the insertion beam 4 can enter and exit the furnace smoothly. Yes.

  As shown in FIG. 1, the insertion beam 4 of a pair of scaffolding structures including the insertion beam 4 and the guide beam 5 is inserted above the intermediate stage 22 in the furnace, but above the hopper portion in the furnace. A lower scaffold base 20 is disposed on the lower scaffold base 20, and a lower scaffold 21 is assembled on the lower scaffold base 20 along the furnace inner wall side to perform a cleaning operation.

  The insertion beam 4 is an H-shaped steel made up of a horizontal upper flange 4a, a lower flange 4b, and a vertical web 4c, and is inserted by inserting the vertical web 4c of the insertion beam 4 between the two C-shaped steel webs 5c of the guide beam 5. The beam 4 is inserted into the furnace through the opening 2 on the side wall of the boiler furnace 1. At this time, guide rollers 13 a, 13 b, and 13 c that are in contact with the lower side of the upper flange 4 a of the insertion beam 4 are appropriately placed at substantially equal intervals in the longitudinal direction of the guide beam 5 on the upper side of the upper flange 5 a of the C-shaped steel of the guide beam 5. Are provided (three in this embodiment). Accordingly, the upper flange 4a of the insertion beam 4 is guided by the guide rollers 13a, 13b, 13c and the supporting roller 10 and the lower flange 4b is held by the roller type driving device 11, and the insertion beam 4 is passed through the manhole 2 provided in the boiler furnace wall 1. It can be smoothly inserted into the furnace, and the insertion beam 4 is inserted to the vicinity of the heat exchanger 3 to be subjected to clinker removal.

  There are a large number of bolt holes 14 and 15 in the vicinity of both ends of the vertical web 5c of the guide beam 5, and a large number of bolts are also provided at the end of the insertion beam 4 at a position corresponding to the bolt holes 14 and 15 of the guide beam 5. A hole (not shown) is provided. Therefore, the bolt hole 14 farther from the furnace 1 functions as a fixing bolt hole 14 when housed in order to fix the insertion beam 4 to the guide beam 5 in a state of being extracted from the furnace 1, and the bolt hole 15 closer to the furnace 1. Functions as an insertion fixing bolt hole 15 for fixing the insertion beam 4 to the guide beam 5 in a state where the insertion beam 4 is inserted into the furnace 1. The fixing bolt hole 14 at the time of storage and the fixing bolt hole 15 at the time of insertion are provided so as to be positioned outside the furnace side wall even when the insertion beam 4 is sufficiently inserted into the furnace 1.

  Accordingly, even when the insertion beam 4 of a pair of scaffolding structures including the insertion beam 4 and the guide beam 5 is inserted into the furnace 1 from the opening 2 on the side wall of the furnace, the fastening member (bolt) -By fixing the insertion beam 4 and the guide beam 5 with nuts 17 (FIG. 4), a pair of upper and lower support members 6, 7, two portal columns 9, a guide beam 5, a support roller 10, and a roller drive The insertion beam 4 can be stably held in a state where the insertion beam 4 is cantilevered by a support member outside the furnace such as the apparatus 11 and the guide roller 13c.

  Boiler furnace working scaffold structure equipped with a pair of scaffolding structures consisting of an insertion beam 4 and a guide beam 5 is usually installed with ten or more units in the horizontal direction of the boiler furnace (can) 1 and inserted from each structure. A scaffold for inserting a beam 4 into a furnace (can) and hooking a scaffold plate (not shown) on the upper surface of the upper flange 4a of the insertion beam 4 to facilitate installation of the scaffold when inserted in the furnace A gantry support 19 for installing the installation pipe 18 and the frame scaffold 8 is provided. This makes it possible to quickly install the scaffold and the frame scaffold 8 when the insertion beam 4 is inserted into the furnace, which is one of the causes of shortening the work period.

  Even when the insertion beam 4 is inserted into the furnace 1, the operation of fixing the insertion beam 4 and the guide beam 5 with the fastening member (bolt / nut) 17 is performed at the position of the fixing fixing bolt hole 15 outside the furnace. Therefore, there is little risk of ensuring the safety of workers and dropping parts into the furnace.

  Rollers 13a, 13b, and 13c are provided at three locations so as to sandwich the upper flange 4a of the insertion beam 4 for sliding the insertion beam 4 on the C-shaped steel flange 5a of the guide beam 5.

  The insertion beam 4 is moved into and out of the furnace by a roller type driving device 11 attached to the lower flange 4b of the insertion beam 4. The operation method of the roller-type drive device 11 is smoothly moved into the furnace while turning the handle (not shown) so that the insertion beam 4 is supported by the guide rollers 13a, 13b and 13c of the guide beam 5.

  After the insertion of the insertion beam 4 into the furnace, the position of the fixing bolt hole 15 at the time of insertion in which both the insertion beam 4 and the guide beam 5 are provided in the guide beam 5 to support the frame scaffold 8 arranged in the furnace. Then, the beams 4 and 5 are fixed and integrated by a fastening member (bolt / nut) 17. At this time, the tip of the insertion beam 4 is slightly lowered due to its own weight, the bolt holes are not aligned except for the center of the bolt group, and the bolt cannot be inserted. Therefore, jack bolts (not shown) attached to the two ends of the insertion beam 4 ( By tightening (not shown), the position of the bolt hole can be adjusted to facilitate the bolt insertion operation.

  The in-furnace scaffolding plate installed in the furnace (the member constituting the floor serving as the foundation of the frame scaffolding 8) enters the furnace through the openings (manholes) 2 installed on the left and right sides of the furnace (can), Scaffolding plates are sequentially installed from the front side in such a manner that a hook (not shown) of the scaffolding plate is put on the scaffolding pipe 18. The gantry support 19 is also installed in the same manner as the scaffold installation pipe 18.

A plurality of sets of scaffold structures each including the insertion beam 4 and the guide beam 5 according to the present embodiment are arranged in a necessary number in the furnace width direction on the front side of the boiler.
When the insertion beam 4 is inserted into the furnace, the scaffold plate and the frame scaffolding 8 attached to the insertion beam 4 ensure a space for performing a clinker removal operation. At this time, the in-furnace work scaffold structure of this embodiment reliably supports the in-furnace scaffold without causing a large amount of bending.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

  In the case of a method of installing a scaffold by passing beams over the furnace walls before and after the boiler furnace as in the prior art, the space between the front and rear furnace walls in the large boiler is wide, so long beams are spanned or assembled. It is not easy to do. If an attempt is made to construct such a beam with a single member, the weight increases and handling becomes difficult. Moreover, in order to assemble a plurality of members, an assembling work becomes large. Since it is difficult to assemble in the furnace for safety reasons, it is necessary to assemble the beam outside the furnace, and even if an attempt is made to feed a long beam from a narrow manhole into the furnace, there is no boiler outside the furnace. Since many steel structures for suspending are arranged, it is not easy to avoid interference with them.

  On the other hand, the working structure in the boiler furnace according to the present embodiment is all from the opening of the boiler furnace wall opening (manhole) 2 until the entire beam structure can be used for in-furnace work. Since it is possible to work outside and no assembly work is required in the furnace, the safety of the worker is ensured.

  As described above, the working structure in the boiler furnace of the present embodiment is for installing a scaffold in which the insertion beam 4 is inserted into the furnace by turning the handle and the hook of the scaffolding plate is attached to the insertion beam 4. Since the scaffold can be installed just by placing it on the pipe 18, it is possible to omit most of the assembly work of the in-furnace scaffold, and it can be quickly disassembled, so the man-hours required for the clinker removal work at the periodic inspection Can be greatly shortened.

  In addition, in a state where the insertion beam 4 is inserted into the furnace and used, a large number of fastening members 17 are necessary to securely fix the insertion beam 4 that is a heavy object in a cantilever manner, and the amount of work associated therewith However, if this operation is an out-of-furnace operation, the floor and the tray can be easily installed by permanent installation or temporary installation, and there is no risk that these parts will fall downward compared to the operation in the furnace.

DESCRIPTION OF SYMBOLS 1 Furnace 2 Manhole 3 Heat exchanger 4 Insertion beam 5 Guide beam 6 Upper support member 7 Lower support member 8 Frame scaffold 9 Post 10 Roller
DESCRIPTION OF SYMBOLS 11 Drive device 13 Roller 14 Fixing bolt hole 15 at the time of accommodation Fixing bolt hole 17 at the time of insertion Fastening member 18 Pipe for scaffold installation 19 Base support 20 Lower scaffold base 21 Lower scaffold 22 Intermediate stage

Claims (2)

In order to use the inside of the furnace of the boiler for thermal power generation, a scaffold structure for working in the boiler furnace for performing work in the furnace,
A guide beam configured by supporting and fixing two C-shaped steel members having a web portion and upper and lower flange portions thereof, spaced apart from each other in a back-to-back manner, supported and fixed to a column provided outside the furnace. When,
It consists of a single H-section steel with a web and upper and lower flanges, and is sandwiched between the two C-section webs that make up the guide beam. In the state of use, it is composed of an insertion beam that is slidably provided so as to be inserted into the furnace through the furnace opening,
The guide beam is provided with fastening holes for fixing the insertion beam with fastening members at both ends in the longitudinal direction,
A part of the insertion beam is provided with a fastening hole for fixing to the guide beam with the fastening member at one end near the outside of the furnace in the longitudinal direction,
In a state where the insertion beam is inserted into the furnace and used, the weight of the insertion beam and the insertion are inserted through a fastening portion positioned outside the furnace and fastened by the fastening member through the fastening hole of the insertion beam and the fastening hole of the guide beam. A set of scaffolding structures is formed to transmit the load of the scaffolding structure placed in the furnace that the beams receive to the guide beams,
A scaffold structure for working in a boiler furnace, wherein a plurality of sets of the scaffold structures are arranged on the side wall on the front side of the furnace of the boiler in the width direction of the furnace.   2. A scaffold installation pipe and a gantry support are mounted on the upper flange of the insertion beam positioned in the furnace in a state where a part of the insertion beam is inserted into the furnace. Scaffolding structure for working in a boiler furnace.

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