EP2840202A1

EP2840202A1 - Working scaffold girder structure for a boiler furnace

Info

Publication number: EP2840202A1
Application number: EP14181740.3A
Authority: EP
Inventors: Yuji Takahashi; Nozomu Nimura; Ryo Moriguchi; Shohei Sato
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2013-08-23
Filing date: 2014-08-21
Publication date: 2015-02-25
Anticipated expiration: 2034-08-21
Also published as: KR20150022717A; ZA201406198B; KR101580230B1; JP2015040451A; EP2840202B1; JP6172632B2

Abstract

In order to provide a working scaffold girder structure 10 in a boiler furnace 12, a working scaffold girder carriage apparatus 100, and a method of installing a working scaffold, by which the working scaffold can be easily installed/removed in/from the boiler furnace 12, a working scaffold girder structure 10 in a boiler furnace includes: a girder body 20 that is formed by vertically stacking a pair of H-beams such that a flange of one of the H-beams faces a flange of the other H-beam and providing a truss structure 26 between the flanges; and a stringer 60 having one end supported by a side surface of the girder body 20 and the other end connectable to a side surface of a neighboring girder body 20, the stringer being foldable or unfoldable in a hinged manner with respect to the one end from the side surface of the girder body in a direction intersecting with a longitudinal direction of the girder body.

Description

TECHNICAL FIELD

The present invention relates to a working scaffold girder structure in a boiler furnace, a working scaffold girder carriage apparatus, and a method of installing a working scaffold, for temporarily installing a working scaffold for inspection of the boiler furnace.

BACKGROUND ART

In the related art, in order to perform inspection inside a boiler furnace, an operator enters into an inner space of the boiler furnace after stopping a boiler and lowering a temperature to a workable level. Then, first, a scaffold base is built in a hopper thereunder.
In addition, a scaffolding frame is assembled along an inner surface of the furnace wall up to a water tube nose portion or a superheater arranged thereover to allow a scaffolding girder to stretch over the scaffolding frame.
Then, scaffolding plates are placed and fixed onto the scaffolding girder to form a working scaffold. An operator performs a work such as inspection or maintenance of a superheater provided in a ceiling of the boiler furnace and removal of clinkers using the working scaffold.
However, it is difficult to assemble such a working scaffold before a furnace temperature is sufficiently lowered. In addition, since it takes a long time to install and remove the scaffolding frame in the internal space of the boiler furnace of several tens of meters, a stop time of the boiler increases, and operation efficiency decreases. In addition, even in the case of emergency stop caused by a trouble and the like, it is necessary to wait until the furnace temperature is sufficiently lowered. Therefore, it is difficult to immediately address the trouble.
In this regard, in a scaffolding girder insertion apparatus discussed in JP 05-3481 U , a scaffolding girder interposed between a pair of girder insertion frames is inserted from a girder insertion opening, and the scaffolding girder stretches over an upper slope portion of a water tube nose portion while the scaffolding girder maintains a horizontal state using a wire connected between the overlying girder insertion frame and a leading end of the scaffolding girder. As a result, it is possible to perform a part of the process of assembling the working scaffold without lowering the furnace temperature. Therefore, it is possible to efficiently assemble the working scaffold.
In a working scaffold structure in a boiler furnace discussed in JP 2011-80668 A , a single H-beam is interposed between a pair of C-beams, and an insertion girder is inserted into the furnace through a furnace opening during an operation state. It is possible to perform an inspection work through a short installation process by forming a scaffold in the insertion girder.
In a scaffolding insertion apparatus discussed in JP 2005-264546 A , the scaffolding insertion apparatus has a clamp unit for clamping the scaffolding girder, a feeding unit that feeds the scaffolding girder to the inner space of the boiler, and a travel unit that travels along the outside of the boiler.

[Citation List]

[Patent Literatures]

[Patent Literature 1] JP 05-3481 U
[Patent Literature 2] JP 2011-80668 A
[Patent Literature 3] JP 2005-264546 A

SUMMARY OF INVENTION

However, in the scaffolding girder insertion apparatus discussed in JP 05-3481 U , it is necessary to use an insertion tool and the like or allow an operator to enter into the internal space of the furnace to perform a work for connecting a wire to the scaffolding girder. This is a cumbersome work. Furthermore, if the girder enters or exits only using upper and lower driving rollers, horizontal sway may easily occur.
In the working scaffold structure discussed in JP 2011-80668 A , there is no stringer across the insertion girder. Therefore, a range of the working scaffold is small, and the inspection area is significantly limited.
In the apparatus discussed in JP 2005-264546 A , a side surface of the scaffolding girder is clamped. Therefore, a structure adaptable to the scaffolding girder is limited to a particular type such as an H-beam. In addition, as the length of the scaffolding girder increases, a leading end of the girder supported in a cantilever manner droops. Therefore, it is necessary to perform a process of lifting a support stand in the receiving side.
In view of the aforementioned problems, the present invention aims to meet the need for a working scaffold girder structure in a boiler furnace, a working scaffold girder carriage apparatus, and a method of installing a working scaffold, by which the working scaffold can be easily installed/removed in/from the boiler furnace.
According to a first aspect of this disclosure, there is provided a working scaffold girder structure in a boiler furnace, including: a girder body formed by vertically stacking a pair of H-beams such that a flange of one of the H-beams faces a flange of the other H-beam and providing a truss structure between the said flanges; and a stringer having one end supported by a side surface of the girder body and the other end connectable to a side surface of a neighboring girder body, the stringer being foldable or unfoldable in a hinged manner with respect to the one end from the side surface of the girder body in a direction intersecting with a longitudinal direction of the girder body.
In the working scaffold girder structure described above, the girder body may have a guide that protrudes from both principal surfaces of a web plate of the H-beam in parallel with the flanges and extends along a longitudinal direction of the girder body.
In the working scaffold girder structure described above, the girder body may have a suspension accessory provided in a leading end and engaged with a suspension rod of the water tube nose portion.
In the working scaffold girder structure described above, the girder body may have a plurality of individual girders connected in a longitudinal direction, each of the individual girders is formed by vertically stacking a pair of H-beams such that a flange of one of the H-beams faces a flange of the other H-beam and providing a truss structure between the flanges, and the individual girder is formed such that no stringer is provided in any side surface, one or more stringers are provided in any one of the side surfaces, or one or more stringers are provided in each of both the side surfaces.
According to another aspect of this disclosure, there is provided a working scaffold girder carriage apparatus including: a roller guide rail capable of placing and delivering a working scaffold girder structure along a longitudinal direction of a girder body into a boiler furnace from an opening of the boiler furnace, the working scaffold girder structure in the boiler furnace having a girder body formed by vertically stacking a pair of H-beams such that a flange of one of the H-beams faces a flange of the other H-beam and providing a truss structure between the flanges and a stringer having one end supported by a side surface of the girder body and the other end connectable to a side surface of a neighboring girder body, the stringer being foldable or unfoldable in a hinged manner with respect to the one end from the side surface of the girder body in a direction intersecting with a longitudinal direction of the girder body; and a gantry erected from a roller surface of the roller guide rail to a side where the girder body is placed to surround the girder body, wherein the gantry has a clamp unit capable of clamping both principal surfaces of the other flange of the one of the H-beam, and a delivery unit capable of advancing or retreating the girder body clamped by the clamp unit along a longitudinal direction.
In the working scaffold girder carriage apparatus described above, an inner side of the gantry may have a first guide roller that extends in parallel with the flange from both principal surfaces of a web plate of any one of the H-beams of the girder body and makes sliding contact with a side surface of a guide extending along a longitudinal direction of the girder body, and a second guide roller that makes sliding contact with a side surface of the other flange of the other H-beam.
In the working scaffold girder carriage apparatus described above, an upper portion of the gantry may have an upper feeding roller that makes sliding contact with the principal surface of the flange of the one of the H-beams.
According to still another aspect of this disclosure, there is provided a method of installing a working scaffold, including: forming a plurality of working scaffold girder structures by connecting and inserting, in a longitudinal direction, individual girders formed by vertically stacking a pair of H-beams such that a flange of one of the H-beams faces a flange of the other H-beam and providing a truss structure between the flanges; forming a working passage by connecting a stringer of the individual girder neighboring to an opening side; and expanding and installing a scaffolding plate in the working passage.
As described above, according to this disclosure, since a stringer foldable or unfoldable in a hinged manner in a side surface of the girder body of the truss structure and connectable to a neighboring girder body is provided, it is possible to simplify a process of delivering the girder body having a predetermined level of rigidity and easily form the working scaffold girder structure through a short process.
As described above, according to this disclosure, since the guide is installed in the girder body, it is possible to prevent horizontal sway of an upper portion of the girder body when the girder is fed using the carriage apparatus and straightly deliver the girder body from the opening of the boiler furnace to the inner space of the furnace. Therefore, it is possible to shorten a working time or reduce man power.
As described above, according to this disclosure, it is possible to lift the girder body that is supported in a cantilever manner and droops in its leading end and horizontally arrange the entire girder. In addition, it is possible to temporarily install the working scaffold girder without preparing a protrusion such as a support stand under the water tube nose portion.
As described above, according to this disclosure, since the girder body is delivered while the flange of the H-beam of the girder body is clamped using the clamp unit, it is possible to deliver the girder body in a cantilever support state even when there is an accessory such as a stringer or unevenness such as a truss structure in a side surface of the girder body.
In addition, since both principal surfaces of the flange of the H-beam of the girder body is clamped using the clamp unit, it is possible to suppress the leading end supported in a cantilever manner from drooping. Furthermore, it is possible to fix the girder body in a temporary installation position.
As described above, according to this disclosure, it is possible to prevent the girder body from horizontal sway using the first and second guide rollers and straightly feed the girder body from the opening to the inner space of the furnace.
As described above, according to this disclosure, since the feeding roller that makes sliding contact with a principal surface of the flange of the H-beam in the upper portion of the girder body is provided, it is possible to prevent drooping of the leading end side of the girder body by suppressing a rise of the cantilever support side of the girder body.
As described above, according to this disclosure, the individual girders are connected and inserted in a longitudinal direction, a plurality of working scaffold girder structures are formed, and a working passage is formed by connecting a stringer between the individual girders. Therefore, it is possible to easily expand and install the scaffolding plate from the working passage and reduce an installation work time.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a side view illustrating a working scaffold girder structure in a boiler furnace and a working scaffold girder carriage apparatus according to this disclosure;
FIG. 2 is an explanatory diagram illustrating a working scaffold using a working scaffold girder structure in a boiler furnace according to this disclosure;
FIG. 3 is an explanatory diagram illustrating a working scaffold girder structure 10d in a boiler furnace according to this disclosure;
FIG. 4 is an explanatory diagram illustrating a working scaffold girder structure 10b in a boiler furnace according to this disclosure;
FIG. 5 is an explanatory diagram illustrating a coupling member for coupling individual girders C and D of the working scaffold girder structure 10b in a boiler furnace according to this disclosure;
FIG. 6 is an explanatory diagram illustrating operation of a stringer of an individual girder B of the working scaffold girder structure 10b in a boiler furnace according to this disclosure;
FIGS. 7A to 7F are explanatory diagrams illustrating a feeding operation of the working scaffold girder structure in a boiler furnace according to this disclosure;
FIGS. 8A to 8C are explanatory diagrams illustrating a suspension accessory and a suspension rod of the working scaffold girder structure in a boiler furnace according to this disclosure;
FIG. 9 is a perspective view illustrating the working scaffold girder carriage apparatus according to this disclosure;
FIG. 10 is a side view illustrating the working scaffold girder carriage apparatus according to this disclosure;
FIG. 11 is a plan view illustrating the working scaffold girder carriage apparatus according to this disclosure;
FIG. 12 is a view as seen in an arrow direction A-A of FIG. 10;
FIG. 13 is a view as seen in an arrow direction B-B of FIG. 10;
FIG. 14 is a view as seen in an arrow direction C-C of FIG. 10;
FIG. 15 is a plan view illustrating a clamp unit;
FIG. 16 is a side view illustrating the clamp unit;
FIG. 17 is a view as seen in an arrow direction D-D of FIG. 15 when the clamp unit has a released state;
FIG. 18 is a view as seen in an arrow direction D-D of FIG. 15 when the clamp unit has a clamped state;
FIGS. 19A to 19D are first explanatory diagrams illustrating a method of installing a working scaffold;
FIGS. 20A to 20C are second explanatory diagrams illustrating a method of installing a working scaffold; and
FIGS. 21A to 21B is third explanatory diagrams illustrating a method of installing a working scaffold.

DESCRIPTION OF EMBODIMENTS

A working scaffold girder structure in a boiler furnace (hereinafter, simply referred to as a working scaffold girder structure), a working scaffold girder carriage apparatus, and a method of installing a working scaffold according to embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. FIG. 1 is a side view illustrating a working scaffold girder structure in a boiler furnace and a working scaffold girder carriage apparatus according to this disclosure. It is noted that a stringer is intentionally omitted in FIG. 1. FIG. 2 is an explanatory diagram illustrating a working scaffold using the working scaffold girder structure in a boiler furnace according to this disclosure. FIG. 3 is an explanatory diagram illustrating a working scaffold girder structure 10d in a boiler furnace according to this disclosure, in which plan views, side views, and rear views of each of individual girders A to E are illustrated. FIG. 4 is an explanatory diagram illustrating a working scaffold girder structure 10b in a boiler furnace according to this disclosure, in which plan views, side views, and rear views of each of individual girders A to E are illustrated. FIG. 5 is an explanatory diagram illustrating a coupling member for coupling the individual girders C and D of the working scaffold girder structure 10b in a boiler furnace according to this disclosure. In addition, in FIG. 5, the stringer is intentionally omitted. FIG. 6 is an explanatory diagram illustrating operation of the stringer of the individual girder B of the working scaffold girder structure 10b in a boiler furnace according to this disclosure.

The working scaffold girder structure 10 according to this disclosure includes, as a fundamental configuration, a girder body 20 and a stringer 60 having a truss structure for maintaining a predetermined level of rigidity.
The girder body 20 is a long girder extending from an opening 14 of the boiler furnace 12 to a lower side of a water tube nose portion 16 in the furnace. The girder body 20 includes a pair of H-beams and a truss structure 26. The pair of H-beams includes a first H-beam 22 and a second H-beam 24 having the same shape. The truss structure 26 is installed between the pair of H-beams. The first and second H- beams 22 and 24 includes first flanges 22a and 24a, respectively, second flanges 22b and 24b, respectively, and web plates 22c and 24c, respectively, formed therebetween. Specifically, the girder body 20 is formed by stacking the first and second H- beams 22 and 24 such that the first flanges 22a and 24a of the first and second H- beams 22 and 24 face each other, and a truss structure 26 is provided between the first flanges 22a and 24a. In other words, the web plates 22c and 24c are arranged coplanarly, the truss structure 26 is mounted on a top surface of the first flange 22a of the first H-beam 22, and the first flange 24a of the second H-beam 24 is stacked on the top surface of the truss structure 26. The first and second H- beams 22 and 24 are provided with a reinforcing plate 28 that makes contact with the first and second flanges and the web plates in a cross-sectional direction. In order to strengthen the girder body 20, a plurality of reinforcing plates 28 are provided with an equal interval along a longitudinal direction of the girder body 20.
The girder body 20 includes a plurality of split individual girders A to E (in this embodiment, for example, 5 split girders) as illustrated in FIGS. 3 and 4. The individual girder A in the leading end is first delivered, and then, the individual girders B to E are sequentially coupled in this order. As a result, it is possible to easily house the girder in a building of the boiler furnace 12 or easily treat it during the delivery. In addition, the individual girders B and C are provided with a stringer or stringers 60 described below in any one of or both side surfaces of the web plate. The individual girder D is provided with a pair of stringers 60 in any one of the side surfaces or each of both the side surfaces of the web plate. The stringer of the individual girder D having such a configuration is to form a passage provided in the vicinity of an operator access opening 18 as illustrated in FIG. 2.
A coupling member 30 is used to couple each of the individual girders. The coupling member 30 couples the first H-beams 22 of the individual girders to each other or the second H-beams 24 to each other. Specifically, in order to couple the first H-beams 22, the coupling member 30 includes a pair of plate receptacles 32, a girder connecting plate 34, a pair of key-grooved pins 36, and a key plate 38.
The plate receptacle 32 includes a pair of plates having a substantially rectangular shape as seen in a plan view and a height substantially equal to a length (height) of the web plate and a pair of pin holes 32a provided in the vicinity of the center thereof, where the key-grooved pin 36 described below can be inserted. In addition, the plate receptacle 32 is installed in parallel with the web plate 22c between heads of the first and second flanges 22a and 22b with respect to the web plate 22c. A plate insertion hole 32b where the girder connecting plate 34 described below can be inserted is formed between the plate receptacle 32 and the web plate 22c. The plate receptacle 32 is provided with a mounting hole 32c for fixing the key plate 38 described below. Such a plate receptacle 32 is installed in both ends of the first H-beam 22 of the individual girder.
The girder connecting plate 34 includes a pair of substantially rectangular plates having a thickness that can be inserted into the plate insertion hole 32b, a longitudinal length corresponding to the length of a pair of plate receptacles 32 arranged in series, and a height substantially equal to the length of the web plate 22c. The girder connecting plate 34 is provided with four holes 34a in positions matching the pin holes 32a when it is inserted into the plate insertion hole 32b.
The key-grooved pin 36 is a pin insertable into the pin hole 32a and the hole 34a and has a head 36a in one end and a key groove 36b in the other end. The key-grooved pin 36 has a length set such that, as it is inserted into the pin hole 32a, and the head 36a abuts on one of plates of the plate receptacle 32, the key groove 36b protrudes from the other plate.
The key plate 38 has a pair of hollows 38a fitting into the key groove 36b protruding from the plate of the plate receptacle 32. In addition, the key plate 38 has a mounting hole 38b in a position matching the mounting hole 32c of the plate receptacle 32.
In order to couple the second H-beams 24 to each other, the girder connecting plate 34, a pair of plate receptacles 33, a pair of pins 42, and a pair of pin pressing guides 40 are employed. In addition, the girder connecting plate 34 has the same shape as that used to couple the first H-beams 22.
The plate receptacle 33 has substantially the same shape as that used to couple the first H-beams 22 and may be applicable to the second H-beam 24. However, the position of the mounting hole 33c is different. The mounting hole 33c of the plate receptacle 33 is provided to interpose the pin hole 33a therebetween.
The pin 42 has a diameter insertable into the pin hole 33a and a length matching the thickness of the plate receptacle 33. In other words, the diameter of the pin 42 corresponds to a distance between the outer sides of a pair of plates. Such a pin 42 is configured such that its both ends do not protrude from a principal surface of the plate receptacle 33 when it is inserted into the plate receptacle 33.
The pin pressing guide 40 blocks the pin hole 33a of the plate receptacle 33 from the outside, protrudes in parallel with the flange of the H-beam from both principal surfaces of the plate receptacle 33, and extends in a longitudinal direction of the girder body 20. Specifically, the pin pressing guide 40 includes a rectangular plate that covers the pin hole 33a, a protruding plate that protrudes in parallel with the flange of the H-beam from the principal surface of the rectangular plate, that is, perpendicularly to the rectangular plate, and an extension plate that extends along the longitudinal direction of the girder body 20 from the leading edge of the protruding plate, that is, in parallel with the rectangular plate. The pin pressing guide 40 having such a configuration can be formed in series along the longitudinal direction of the girder body 20 together with a guide 50 described below. The pin pressing guide 40 is provided with a mounting hole 40a in a position matching the mounting hole 33c of the plate receptacle 33 so that it can be fixed to the plate receptacle 33 using a fastening element such as a bolt.
A guide 50 is installed in both principal surfaces of the web plate 24c of the second H-beam 24.
The guide 50 protrudes in parallel with the flanges from both principal surfaces of the web plate 24c of the second H-beam 24 and extends along the longitudinal direction of the girder body 20. Specifically, the guide 50 is installed in a guide support piece 52 mounted on the reinforcing plate 28. The guide support piece 52 extends in parallel with the flange from the center of the reinforcing plate 28 and protrudes to be separate from the web plate 24c. The guide 50 extends in parallel with the web plate 24c on the end face of the guide support piece 52, that is, along the longitudinal direction of the girder body 20. The guide 50 according to this embodiment protrudes to the outer side than the flange with respect to the web plate 24c.
The stringer 60 is a connecting member that connects a plurality of working scaffold girder structures 10 inserted in the same direction from the opening 14 of the boiler furnace 12 to each other in a direction perpendicular to the longitudinal direction. The stringer 60 according to this embodiment has a truss structure 62 similar to that of the girder body 20 and is provided with fastening mounts 63 extending in the longitudinal direction in four corners of the truss structure 62. The fastening mount 63 is provided with a hole 64 where a fastening member such as a bolt or a pin can be inserted. In such a stringer 60, one end side serves as a support portion 66, and the other side serves as a connecting portion 68.
The support portion 66 is installed in a pair of upper and lower support pieces 69 extending in a direction perpendicular to the longitudinal direction from the side surface of the girder body 20. The support pieces 69 protrude from both side surfaces with respect to the girder body 20. An interval between a pair of upper and lower support pieces 69 is set to a length substantially equal to the vertical length (height) of the stringer 60. In addition, the upper and lower support pieces 69 are provided with holes 69a in positions matching the holes 64 in both ends as seen in a plan view. The left and right protruding lengths of the support pieces 69 with respect to the girder body 20 are set to be substantially equal to or shorter than the protruding length of the guide 50. The support portion 66 is mounted on the support piece 69 using a fastening member such as a bolt. The stringer 60 is formed to be foldable or unfoldable in a hinged manner with respect to such a support portion 66 to a direction intersecting with the longitudinal direction of the girder body 20 from the side surface of the girder body 20.
The connecting portion 68 is connectable to the side surface of another neighboring girder body 20. The connecting portion 68 is fixed to the hole 69a of the support piece 69 positioned perpendicularly to the longitudinal direction of the girder body 20 using a fastening member such as a pin in order to connect the girder assemblies 20 to each other.
A design of the stringer provided in the working scaffold girder structure 10 may change depending on the configuration of the boiler furnace. For example, as illustrated in FIG. 2, the stringer 60 may not be provided in the working scaffold girder structure 10a. Alternatively, the working scaffold girder structure 10b has the stringer 60 on a right side (single side) of the web plate from the opening 14 to the boiler furnace. Alternatively, the working scaffold girder structure 10c has the stringer 60 on a left side (single side) of the web plate from the opening 14 to the boiler furnace. Alternatively, the working scaffold girder structure 10d has the stringers 60 in both sides of the web plate.
In the support pieces 69 of the individual girders B and C of the working scaffold girder structure 10d illustrated in FIG. 3, each stringer 60 is provided in each of both sides with respect to the girder body 20. In addition, in the support piece 69 of the individual girder D, a pair of stringers 60 are provided in both sides with respect to the girder body 20. In the support pieces 69 of the individual girders B and C of the working scaffold girder structure 10b illustrated in FIG. 4, the stringer 60 is provided in one side with respect to the girder body 20, and a pin 69b fitting to the hole 69a is provided in the other side. In addition, in the support piece 69 of the individual girder D, a pair of stringers 60 are provided in one side with respect to the girder body 20.
FIGS. 8A to 8C are explanatory diagrams illustrating a suspension accessory and a suspension rod of the working scaffold girder structure in the boiler furnace according to this disclosure.
The suspension accessory 70 is provided in the individual girder A positioned in the leading end of the girder body 20. The suspension accessory 70 includes a first hanger 72 and a second hanger 74 coupled to each other using a pin. The first hanger 72 is provided with a hole 73 connectable to the suspension rod 80 of the water tube nose portion described below. The second hanger 74 is a hanger longer than the first hanger 72 and is provided with a long hole 75. The pin provided in the individual girder A is inserted into the long hole 75. The suspension accessory 70 is vertically opened from the top surface provided in the leading end of the individual girder A and is housed in a housing space 76 having a reversed L-shape opened horizontally from the top surface. The pin inserted into the long hole 75 is provided in the vicinity of the curved portion of the housing space 76.
The suspension rod 80 is a rod engaged with the suspension accessory 70 of the girder body 20 so that the girder body 20, that is supported in a cantilever manner and droops in its leading end, can be lifted and positioned horizontally. The suspension rod 80 is provided inside the water tube nose portion 16 over the suspension accessory 70. An opening 14a is formed on the lower surface of the water tube nose portion 16 between the suspension rod 80 and the suspension accessory 70. The suspension rod 80 is a rod vertically screwed to a nut 19a of a support beam 19 provided inside the water tube nose portion 16. A lower end of the suspension rod 80 is provided with a hole 80a engaged with the hole 73 of the first hanger 72 by inserting a fastening member. From this opening 14a, it is possible to engage the suspension accessory 70 and the suspension rod 80.
In the suspension accessory 70 having such a configuration, the second hanger 74 is housed in the vertical space of the housing space 76 when it is housed as illustrated in FIG. 8A. In addition, the first hanger 72 bent perpendicularly to the second hanger 74 is housed in the vertical space.
As illustrated in FIG. 8B, as the suspension accessory 70 is engaged with the suspension rod 80, first, the first hanger 72 rises by pulling up a wire inserted into the hole of the first hanger 72 through the opening 14a of the water tube nose portion 16. In addition, the second hanger 74 is lifted by pulling the second hanger 74 in a longitudinal direction. By matching the center of the hole 73 of the first hanger 72 with the center of the hole 80a of the suspension rod 80, they are engaged with each other using a fastening member (FIG. 8C). The drooping girder body 20 is lifted to an appropriate position, that is, in a horizontal position by tightening the nut 19a of the support beam 19.

Next, the working scaffold girder carriage apparatus 100 according to this disclosure will be described hereinafter. FIG. 9 is a perspective view illustrating the working scaffold girder carriage apparatus according to this disclosure. FIG. 10 is a side view illustrating the working scaffold girder carriage apparatus according to this disclosure. FIG. 11 is a plan view illustrating the working scaffold girder carriage apparatus according to this disclosure. FIG. 12 is a view as seen from an arrow direction A-A of FIG. 10. FIG. 13 is a view as seen from an arrow direction B-B of FIG. 10. FIG. 14 is a view as seen from an arrow direction C-C of FIG. 10. In all of FIGS. 12 to 14, the individual girder D (in which a pair of stringers are provided in one side) is additionally indicated by a one-dotted chain line.
The working scaffold girder carriage apparatus 100 includes a roller guide rail 120 that can deliver the girder body 20 along the longitudinal direction of the girder body 20 from the opening 14 of the boiler furnace 12 to the inside of the furnace in order to place the working scaffold girder structure 10, and a gantry 130 erected on a roller surface of the roller guide rail 120 around the girder body 20 in the side where the girder body 20 is placed.
In the roller guide rail 120, a plurality of feeding rollers 122 are straightly arranged between a pair of channels with a predetermined interval. The feeding roller 122 can be freely rotated and does not have a driving source such as a motor. In addition, the feeding roller 124 of the opening side has a larger diameter than those of other feeding rollers 122 and has a bearing mechanism. In such a roller guide rail 120, a plurality of feeding rollers 122 and 124 can deliver the girder body 20 along a longitudinal direction while they make contact with a bottom surface of the girder body 20.
The gantry 130 is erected vertically from the placement surface of the girder body 20 such that the girder body 20 is surrounded in an arch shape in the opening side of the roller guide raill20. The gantry 130 according to this embodiment includes a first gantry 132 and a second gantry 134.
The first gantry 132 is provided in an end of the roller guide rail20 in the opening side. First guide rollers 136 and second guide rollers 138 are installed in the first gantry 132.
The first guide rollers 136 are installed to interpose the girder body 20 therebetween in the upper side of the first gantry 132. The first guide rollers 136 are a pair of rollers that make contact with both side surfaces of the guide 50 of the second H-beam 24 of the girder body 20.
The second guide rollers 138 are installed to interpose the girder body 20 therebetween in the lower side of the first gantry 132. The second guide rollers 138 are a pair of rollers that make contact with both side surfaces of the second flange 22b of the first H-beam 22 of the girder body 20. In the first and second guide rollers 136 and 138 having such configurations, it is possible to prevent horizontal sway in a feeding direction of the girder body 20 and straightly deliver the girder body 20 into the inner space of the boiler furnace.
The second gantry 134 is provided in the opening side from the center of the roller guide rail 120. An upper feeding roller 140, a delivery unit 150, and a clamp unit 160 are installed in the second gantry 134.
The upper feeding roller 140 is a roller that makes contact with the top surface of the second flange 24b of the second H-beam 24 of the girder body 20 in the upper portion of the second gantry 134. The upper feeding roller 140 can be freely rotated and does not have a driving source such as a motor. In addition, similar to the feeding roller 124 of the opening side, the upper feeding roller 140 has a diameter larger than those of other feeding rollers 122 and is provided with a bearing mechanism.
The delivery unit 150 is a hydraulic cylinder mechanism horizontally expandable to the first gantry 132 side from the upper portion of the second gantry 134. The delivery unit 150 includes a hydraulic cylinder 152 and a piston rod 154, and an end of the hydraulic cylinder 152 is mounted on the upper portion of the second gantry 134. The piston rod 154 is reciprocatable inside the hydraulic cylinder 152, and the clamp unit 160 described below is installed in the leading end of the piston rod 154. In the delivery unit 150 having such a configuration, the piston rod 154 is stretched or retracted by supplying a hydraulic pressure of a hydraulic source (not illustrated) to the hydraulic cylinder 152, so that the clamp unit 160 can advance or retreat along a longitudinal direction of the girder body 20.
FIGS. 15A to 15D are plan views illustrating the clamp unit. FIGS. 16A to 16D are side views illustrating the clamp unit. FIGS. 17A to 17C are views as seen in an arrow direction D-D when the clamp unit 15 is released. FIGS. 18A and 18B are views as seen in an arrow direction D-D when the clamp unit of FIGS. 15A to 15D is clamped, in which the individual girders B, C, or E are clamped. The clamp unit 160 includes a clamp plate 162, a clamp jack 164, a clamp arm 166, and a travel roller 168.
The clamp plate 162 is a substantially rectangular plate, as seen in a plan view, arranged in a principal surface (top surface) of one side of the second flange 24b of the second H-beam 24. A pair of clamp jacks 164 and a hydraulic path connected to the clamp jack 164 are installed on the top surface of the clamp plate 162.
A pair of notches are provided in the sides of the clamp plate 162 parallel to the longitudinal direction of the girder body 20, and the clamp arm 166 is installed in the notch. The clamp arm 166 has a U-shape as seen in a cross-sectional view. Any one of the opposite sides of the clamp arm 166 is connected to a movable portion of the clamp jack 164, and the other side faces the principal surface (lower surface) of the clamp plate 162 with a predetermined gap. The girder body 20 according to this embodiment is delivered while the second flange 24b of the second H-beam 24 is interposed between the lower surface of the clamp plate and the other side of the clamp arm 166.
As illustrated in FIGS. 17A to 17C, as the clamp jack 164 is retracted by supplying a hydraulic pressure from a hydraulic source (not illustrated), the clamp arm 166 moves downward (to be close to the roller guide rail 120), and the gap from the clamp plate 162 is widened, so that both principal surfaces of the second flange 24b of the second H-beam 24 can be released.
Meanwhile, as illustrated in FIGS. 18A and 18B, as the clamp jack 164 expands by supplying a hydraulic pressure from a hydraulic source (not illustrated), the clamp arm 166 moves upward (to be distant from the roller guide rail 120), and the gap from the clamp plate 162 is narrowed, so that both principal surfaces of the second flange 24b of the second H-beam 24 can be clamped.
The (four) travel rollers 168 are installed in each side of the clamp plate 162 in a direction intersecting with the longitudinal direction of the girder body 20. The travel rollers 168 make contact with the top surface of the second flange 24b of the second H-beam 24 to support the clamp unit 160 over the girder body 20.
The effects of the working scaffold girder structure in a boiler furnace and the working scaffold girder carriage apparatus having the aforementioned configuration will be described hereinafter.
FIGS. 7A to 7F are explanatory diagrams illustrating a feeding operation of the working scaffold girder structure in a boiler furnace according to this disclosure.
As illustrated in FIG. 7A, the individual girder A is placed on the roller guide rail 120 of the working scaffold girder carriage apparatus 100 using a crane. In addition, the individual girder A is pushed to the opening 14 side to open a space. Then, the individual girder B is placed on the roller guide rail 120 using a crane. The individual girders A and B are coupled using a coupling member 30. The plate receptacles 32 and 33 and the girder connecting plate 34 are installed in the individual girder A in advance. In addition, the plate receptacles 32 and 33 are installed in the individual girder B. Furthermore, the girder connecting plate 34 of the individual girder A is inserted into the plate receptacles 32 and 33 of the individual girder B. A pin 42 is inserted into the pin hole 32a of the plate receptacle 33 in the upper portion of the individual girder B. Then, the pin pressing guide 40 is fixed by blocking the pin hole 32a from the outside of the plate receptacle 33 and inserting a fastening member to the mounting hole 33c. As a result, the pin pressing guide 40 can be formed in series along the longitudinal direction of the girder body 20 together with the guide 50. The key-grooved pin 36 is inserted into the pin hole 32a of the plate receptacle 32 in the lower portion of the individual girder B. Then, a hollow of the key plate 38 is fitted to the key groove 36b. In addition, the key-grooved pin 36 is fixed by inserting a fastening member into the mounting hole 38b.
The coupled individual girders A and B are delivered to the opening 14 side using the delivery unit 150 while the second flange 24b of the second H-beam 24 is clamped using the clamp unit 160, so that the individual girder A is inserted into the furnace from the opening 14.
Similarly, as illustrated in FIGS. 7B to 7D, the individual girders C to E are placed on the roller guide rail 120 of the carriage apparatus using a crane. In addition, the individual girders C to E are coupled using the coupling member 30 and are delivered to form the girder body 20.
As illustrated in FIG. 7E, as the individual girder E is delivered while the flange of the individual girder E is clamped using the clamp unit 160, the leading end of the individual girder A is positioned under the opening 14a of the water tube nose portion 16. In this case, since the girder body 20 is supported in a cantilever manner by the working scaffold girder carriage apparatus 100, the leading end side of the girder body 20 droops under its own weight.
As illustrated in FIG. 7F, the opening 14a of the water tube nose portion 16 is opened. A wire is inserted into the hole of the underlying first hanger 72 from the opening 14a and is pulled up to erect the first hanger 72. In addition, the second hanger 74 is lifted in a longitudinal direction of the second hanger 74. The first hanger 72 and the suspension rod 80 are engaged with each other using a fastening member while the centers of the holes thereof match each other. The drooping working scaffold girder structure 10 is lifted to an appropriate position, that is, in a horizontal position by tightening the nut 19a of the support beam 19. As a result, the leading end side (individual girder A) of the working scaffold girder structure 10 is engaged with the suspension rod 80 of the water tube nose portion 16, and the trailing end side (individual girder E) is clamped by the clamp unit 160, so that the working scaffold girder structure 10 is fixed inside the furnace.
FIGS. 19A to 19D and FIGS. 20A to 20C are explanatory diagrams illustrating a method of installing a working scaffold. The working scaffold girder structures 10a and 10b are inserted from the side surface side (one end) of the boiler furnace 12 where the operator access opening 18 is provided (FIG. 19A). In addition, the stringer 60 of the working scaffold girder structure 10b in the vicinity of the operator access opening 18 is unfolded in a hinged manner to intersect with a longitudinal direction of the girder body 20 and is fixed to the hole 69a of the support piece 69 of the girder body 20 of the neighboring working scaffold girder structure 10a using a fastening member. In addition, the scaffolding plates 170 delivered from the operator access opening 18 are placed on the stringer 60 to form an operator access passage.
Then, as illustrated in FIG. 19B, the overhanging beam 172 is arranged to hang over the working scaffold girder structures 10a and 10b and have one end protruding from a wall surface side of the boiler furnace 12. The scaffolding plate 170 delivered from the operator access opening 18 is placed and fixed between the working scaffold girder structures 10a and 10b and between the working scaffold girder structure 10a and the wall surface of the boiler furnace. In addition, the working scaffold girder structures 10a and 10c are inserted from the side surface side (the other side) of the boiler furnace 12 where one of the operator access openings 18 is provided, and the stringer 60 of the working scaffold girder structure 10c in the vicinity of the operator access opening 18 is unfolded in a hinged manner in a direction intersecting with a longitudinal direction of the girder body 20 and is fixed by installing a fastening member to the hole 69a of the support piece 69 of the girder body 20 of the neighboring working scaffold girder structure 10a. Then, the scaffolding plates 170 are placed to form the operator access passage.
As illustrated in FIGS. 19C, together with a work of placing the scaffolding plates 170, the working scaffold girder structures 10b and 10d are inserted to perform a process of forming the operator access passage.
Such a work is performed until an end of the inserted working scaffold girder structure is overlapped with the leading end of the water tube nose portion 16 as seen in a plan view (FIG. 19D).
Then, as illustrated in FIG. 20A, an opening is formed by removing the scaffolding plates 170 in a place, surrounded by the working scaffolds in a frame shape (the place indicated by the cross x in FIG. 20A), where the suspension scaffold 176 having a frame shape is formed.
In addition, as illustrated in FIG. 20B, the suspension scaffold 176 temporarily mounted on a top surface of the working scaffold is inserted downward from the opening.
The suspension scaffold 176a arranged under the water pipe nose 16 is first inserted into the lower portion of the working scaffold in the leading end side of the water tube nose portion 16 and is then supported by a suspension scaffold support beam 174 having a frame shape.
As illustrated in FIG. 20C, the suspension scaffold 176a supported by the suspension scaffold support beam 174 is slidingly moved to the individual girder A under the water tube nose portion 16.
As illustrated in FIG. 21, as the suspension scaffolds 176 are connected using the scaffolding plate 170, the suspension scaffolds 176 are formed to surround the working scaffold in a frame shape under the working area of the working scaffold. By virtue of such a configuration of the suspension scaffold 176, it is possible to perform inspection for a veiled area such as a lower surface of the water tube nose portion 16.
In such a working scaffold girder structure according to this disclosure, there is provided a stringer foldable or unfoldable in a hinged manner in a side surface of the girder body of the truss structure and connectable to a neighboring girder body. Therefore, it is possible to simplify a delivery work of the girder body having a predetermined level of rigidity and easily form a working scaffold girder through a short process.
In the working scaffold girder carriage apparatus according to this disclosure, the girder body is delivered while the flange of the H-beam of the girder body is clamped using the clamp unit. Therefore, it is possible to deliver the girder body in a cantilever support state even when there is an accessory such as a stringer or unevenness such as a truss structure in a side surface of the girder body.

Reference Signs and Numerals

10: working scaffold girder structure in boiler furnace,
12: boiler furnace,
14, 14a: opening,
16: water tube nose portion,
18: operator access opening,
19: support beam,
19a: nut,
20: girder body,
22: first H-beam,
22a: first flange,
22b: second flange,
22c: web plate,
24: second H-beam,
24a: first flange,
24b: second flange,
24c: web plate,
26: truss structure,
28: reinforcing plate,
30: coupling member,
32, 33: plate receptacle
32a, 33: a pin hole,
32b: plate insertion hole,
32c, 33c: mounting hole,
34: girder connecting plate,
34a: hole,
36: key-grooved pin,
36a: head,
36b: key groove,
38: key plate,
38a: hollow,
38b: mounting hole,
40: pin pressing guide,
40a: mounting hole,
42: pin,
50: guide,
52: guide support piece,
60: stringer,
62: truss structure,
63: fastening mount,
64: hole,
66: support portion,
68: connecting portion,
69: support piece,
69a: hole,
69b: pin,
70: suspension accessory,
72: first hanger,
73: hole,
74: second hanger,
75: long hole,
76: housing space,
80: suspension rod,
80a: hole,
100: working scaffold girder carriage apparatus,
120: roller guide rail,
122, 124: feeding roller,
130: gantry,
132: first gantry,
134: second gantry,
136: first guide roller,
138: second guide roller,
140: upper feeding roller,
150: delivery unit,
152: hydraulic cylinder,
154: piston rod,
160: clamp unit,
162: clamp plate,
164: clamp jack,
166: clamp arm,
168: travel roller,
170: scaffolding plate,
172: overhanging beam,
174: suspension scaffold support beam,
176, 176a: suspension scaffold.

Claims

A working scaffold girder structure (10) in a boiler furnace (12), comprising:
a girder body (20) formed by vertically stacking a pair of H-beams (22, 24) such that a flange (22a, 24a) of one of the H-beams (22, 24) faces a flange (24a, 22a) of the other H-beam (24, 22) and providing a truss structure (26) between the flanges (22a, 24a); and

a stringer (60) having one end supported by a side surface of the girder body (20) and the other end connectable to a side surface of a neighboring girder body (20), the stringer (60) being foldable or unfoldable in a hinged manner with respect to the one end from the side surface of the girder body (20) in a direction intersecting with a longitudinal direction of the girder body (20).
The working scaffold girder structure (10) according to claim 1, wherein the girder body (20) has a guide that protrudes from both principal surfaces of a web plate (22c, 24c) of the H-beam (22, 24) in parallel with the flanges (22a, 24a) and extends along a longitudinal direction of the girder body (20).
The working scaffold girder structure (10) according to claim 1 or 2, wherein the girder body (20) has a suspension accessory (70) provided in a leading end and engaged with a suspension rod (80) of the water tube nose portion (16).
The working scaffold girder structure (10) according to claim 1 or 2, wherein the girder body (20) has a plurality of individual girders (A, B, C, D, E) connected in a longitudinal direction,
each of the individual girders (A, B, C, D, E) is formed by vertically stacking a pair of H-beams (22, 24) such that a flange (22a, 24a) of one of the H-beams (22, 24) faces a flange (24a, 22a) of the other H-beam (24, 22) and providing a truss structure between the flanges (22a, 24a), and
the individual girder (A, B, C, D, E) is formed such that no stringer (60) is provided in any side surface, one or more stringers (60) are provided in any one of the side surfaces, or one or more stringers (60) are provided in each of both the side surfaces.
A working scaffold girder carriage apparatus (100) comprising:
a roller guide rail (120) capable of placing and delivering a working scaffold girder structure (10) along a longitudinal direction of a girder body (20) into a boiler furnace (12) from an opening (14) of the boiler furnace (12), the working scaffold girder structure (10) in the boiler furnace (12) having a girder body (20) formed by vertically stacking a pair of H-beams (22, 24) such that a flange (22a, 24a) of one of the H-beams (22, 24) faces a flange (24a, 22a) of the other H-beam (24, 22) and providing a truss structure (26) between the flanges (22a, 24a) and a stringer (60) having one end supported by a side surface of the girder body (20) and the other end connectable to a side surface of a neighboring girder body (20), the stringer (60) being foldable or unfoldable in a hinged manner with respect to the one end from the side surface of the girder body (20) in a direction intersecting with a longitudinal direction of the girder body (20); and

a gantry (130) erected from a roller surface of the roller guide rail (120) to a side where the girder body (20) is placed to surround the girder body (20),

wherein the gantry (130) has
a clamp unit (160) capable of clamping both principal surfaces of the other flange (22a, 24a) of the one of the H-beam (22, 24), and
a delivery unit (150) capable of advancing or retreating the girder body (20) clamped by the clamp unit (160) along a longitudinal direction.
The working scaffold girder carriage apparatus (100) according to claim 5, wherein an inner side of the gantry (130) has
a first guide roller (136) that extends in parallel with the flange from both principal surfaces of a web plate (22c, 24c) of any one of the H-beams (22, 24) of the girder body (20) and makes sliding contact with a side surface of a guide extending along a longitudinal direction of the girder body (20), and
a second guide roller (138) that makes sliding contact with a side surface of the other flange (24a, 22a) of the other H-beam (24, 22).
The working scaffold girder carriage apparatus (100) according to claim 5 or 6, wherein an upper portion of the gantry (130) has an upper feeding roller (140) that makes sliding contact with the principal surface of the flange (22a, 24a) of the one of the H-beams (22, 24).
A method of installing a working scaffold, comprising:
forming a plurality of working scaffold girder structures (10) by connecting and inserting, in a longitudinal direction, individual girders (A, B, C, D, E) formed by vertically stacking a pair of H-beams (22, 24) such that a flange (22a, 24a) of one of the H-beams (22, 24) faces a flange (24a, 22a) of the other H-beam (24, 22) and providing a truss structure (26) between the flanges (22a, 24a);

forming a working passage by connecting a stringer (60) of the individual girder (A, B, C, D, E) neighboring to an opening side; and

expanding and installing a scaffolding plate (170) in the working passage.