KR20070004534A - Apparatus for facilitating new construction and the internal inspection and repair of large vessels, such as recovery boilers and tanks - Google Patents

Abstract

An apparatus for new construction as well as internal inspection and repair of large vessels (1), such as recovery boilers and tanks, comprises a platform (10) which is vertically adjustably suspended by means of suspension cords (13) hanging down from a roof (6) of the vessel (1). The platform (10) is built from at least two parallel spaced-apart girders (11), to which the suspension cords (13) are attached, and at least one plank (12) is arranged perpendicular to the girders (11) and interconnecting the same, the plank resting on the girders (11) and at least partly covering the same. The girders (11) are individually vertically adjustable first lattice girders, which have flat upper sides forming a footboard, on which it is possible to walk and operate safely. The plank (12), on which it is also possible both to walk and work, has a certain overlength, which allows the girders (11) to be individually movable in the vertical direction and sideways within certain limits, thereby significantly increasing the applicability of the platform (10). ® KIPO & WIPO 2007

Description

A device for facilitating the new construction and internal inspection and repair of large vessels, such as recovery boilers and tanks {APPARATUS FOR FACILITATING NEW CONSTRUCTION AND THE INTERNAL INSPECTION AND REPAIR OF LARGE VESSELS, SUCH AS RECOVERY BOILERS AND TANKS}

The present invention relates to a novel construction of large vessels, such as recovery boilers and tanks, and to an apparatus that facilitates internal inspection and repair. The device comprises a platform suitably vertically hung by a suspension cord suspended downwardly in the loop of the vessel, the platform being constructed from two or more parallel spaced girders to which the suspension cord is attached, wherein one or more flanks are girder It is arranged perpendicular to and interconnected, and lies on the girder to partially cover the girder.

If large vessels such as recovery boilers and tanks are built and require internal checks and possible repairs, their large area may require some kind of scaffold or platform to be used in a safe manner. There is a need. Thus, the problem often arises that components included in such scaffolds or platforms must be inserted through relatively small manholes in the walls or loops of the container. Another problem is that the large area described above requires the use of a large amount of scaffolding or platform parts for all parts of the container to be reached. Another problem is that the parts inside the vessel often have to be mounted in difficult situations such as high heat inside the boiler. After all, in particular, some parts of the vessel in the boiler have the problem that, on the one hand, can be difficult to reach due to the nose installed in a particular boiler, ie a protrusion on one side of the side wall of the boiler, on the other hand the superheater hanging from the boiler's loop. May need to be checked or repaired, thus creating a narrow passage between them.

US-A-5,007,501 describes an apparatus which is particularly intended for boilers in thermal power plants and which eliminates certain problems occurring in boilers. More specifically, the parts require fewer numbers in known devices than conventional scaffolds standing upright in the bottom of a large container. However, the mounting of prior art devices is based on the initial mounting from the bottom of a large container, but involves a large number of parts that must be assembled and does not address all the problems in a satisfactory manner.

Japanese Laid-Open Application JP-A-2000-054618 describes an apparatus as described above in the introduction, which has a solution according to US-A-5,007,501 and eliminates one or more problems. The device according to the Japanese published application solves the problem of the initial mounting from the bottom of the container, but at the same time is significantly limited by the fact that the footboard, which is formed with at least one flank, extends only perpendicular to the girder. This limits the applicability and safety of the device due to obstacles when the cap must be placed between two neighboring flanks.

In the present invention, the object of the present invention is to eliminate the problems remaining in such a device, while safe inspection and repair are generally applied to all types of large containers and in a manner in which a significantly more flexible and safe device in a novel configuration is provided. To improve the known apparatus according to JP-A-2000-054618.

According to the invention, this object is achieved by means of a device of the type described above in the introduction, in which the girders are individual vertically adjustable first grating girders having a flat upper side to which the suspension cord is attached and forming a footboard. It is characterized by.

In the device according to the invention, the device comprises individual vertically adjustable grating girders, has a built-in flank for operation, and unlike JP-A-2000-054618, a safe bottom surface is provided along the girders. Lattice girders may be inserted in a latched manner through manholes in the vessel at any level without the need to place a foot at the bottom of the vessel. The one or more flanks may then be arranged in any position between two parallel hanging grid girders. Thus, it may be possible to check from the provided platform, for example from all the walls of the recovery boiler, ie from the wall above the nose described above or from the superheater of the boiler throughout the boiler loop. Due to the excessive length of the flanks (longer than the standard distance between two side-by-side girders hanging on the same level) on the girder, on the one hand, the lattice girders are individually lowered and raised at the appropriate limits, on the other hand, Due to the high temperature that occurs in the operation of the boiler, it follows the contour of the superheater, which will often be very irregular over time.

The girders of the device preferably have a rectangular cross section, and the suspension cords are suitably attached thereto by enclosing holders each having a fastening means for the suspension cords which are enclosed and centered on each girder. The advantage of girders having rectangular cross sections is that they have very good load bearing capacity, which if desired can be connected perpendicularly to the corresponding girders of the rectangular cross section and stacked in an advantageous manner outside the vessel.

The enclosing holder preferably consists of two generally C-shaped halves which are open to face each other, the halves having lugs at their upper and lower ends, through which the locking cotter pin is connected to each other. It may be movable to lock. The designed holder thus extends under the girder to ensure that the full load bearing capacity of the girder structure can be used and protects the girder structure in an advantageous manner from being crushed and damaged in particular on the side.

Preferably, the lugs of the enclosure holder form a fastening means for the suspension cord in the upper cross section. Thus, it may be possible to use the same locking cotter pin in an advantageous manner to lock half of the enclosure holder and to attach the suspension cord.

Half of the enclosing holder is suitably formed of steel band material that is bent into the cross-sectional contour of the girder. Steel is very suitable in shape, has very good tensile strength, has the advantage of being easy to weld, and greatly facilitates the attachment of the ruds for the locking cotter pin.

The device according to the invention may, if desired, be one or more additional girders of the same form as the first lattice girder, hanging below one or more of them at a constant distance. Thus, it would be easy to provide a platform with several layers.

The additional girder must have a rectangular cross section, taking into account that it is advantageous if it is enclosed by the enclosing holder which is hung from the overlapping girder by a suspension band which surrounds the girder and is arranged on both sides of the girder.

Finally, the enclosing holders described above are preferably each composed of two generally C-shaped halves which are open to face each other, the halves having a top of the halves which the locking cotter pin is movable to lock the halves to each other and Consideration should be given to having lugs at the lower end.

Finally, it goes without saying that the above-mentioned holder is suitably configured with a half formed of steel band material bent to the cross-sectional contour of the additional girder.

The suspension band used for hanging the additional girder from the overlapping girder is preferably a steel band and has holes at its ends, through which the locking cotter pin engages the locking in the corresponding hole on the side of the enclosing holder of the associated girder. It may be movable for. Steel bands are advantageous because of the fact that the holes formed therein do not require extra reinforcement and the good tensile strength of the steel.

The device according to the invention is arranged perpendicularly to one or more additional girders and girders hanging below two spaced girders at a constant distance so that they can be further extended by one or more telescopic planks placed on the additional girders and interconnected. Consider what you can do.

The at least one flank is preferably stretchable. The flexible design facilitates adjusting the device to various states effective for the container.

More specifically, the stretchable flanks preferably consist of a U-shaped cross-section that is downwardly oriented and open with internally curved ends overlapping outward and inward, the protrusions of which are limited by draw-limiting means. The advantage of the internal curved ends is that they help better dislocation of the U-shaped cross section because point charge is prevented. The draw-limiting means needs to prevent the two mutual U-shaped sections from slipping apart without intentional reasons for practical reasons.

The draw-means comprise one or more spring-deflected pins, the pins being arranged to move automatically from the inner U-shaped cross section through the lock opening in the leg of the U-shaped cross section for locking. This solution has the advantage that the fin structure has a very good protection of the interior of the flank contours to facilitate handling of the flanks.

The outer U-shaped cross-section, in which the end lies on the girder, has one or more vertical holes for insertion of the locking cotter pin, which pin is arranged to engage the corresponding hole on the upper side of the girder. This type of fixation of the flank to the girder is particularly important for the outermost girder of the platform structure.

Suspension cords are chains that are suitably hung on electrically operated telphers that are arranged on the roof of the vessel. The advantage of the chain compared to the wires used in accordance with US-A-5,007,501 is that they are not twisted and can be handled more precisely by chain telepers than wires wound in layers by wire winches.

In turn, the telphers are preferably remotely controlled individually from the inside of the container. Thus, it may be easy to vertically adjust the individual girders inside the container.

Preferred embodiments of the device according to the present invention will be described in more detail with reference to the following attached drawings.

1 is a side view of a part and partly separated parts of a recovery boiler, in which the apparatus according to the invention is used,

2 is a side view of a long side part of the lattice girder,

3 is a plan view of an upper side part of the lattice girder,

4 is a cross-sectional view of three lattice girders which are internally connected by steel bands arranged on the sides, which in turn are arranged on top of each other,

5 is a cross-sectional view of a first enclosure holder associated with a locking cotter pin,

6 is a cross-sectional view of a second enclosure holder associated with a locking cotter pin,

7 is a plan view of an upper side part of the flexible flank,

8 is a side view of the stretchable flank long side part,

9 is a cross-sectional view of the upper side part of the flank.

1 shows a part of a pressure vessel 1 for a recovery boiler in which the device according to the invention is used for inspection and repair purposes. However, the apparatus may be used for the same purpose in other types of pressure vessels, such as bark-fired boilers, or inside vessels such as oil tanks. In addition, it can be used for such a container in a novel configuration.

The pressure vessel 1 of FIG. 1 has, among other things, a wall 2 with a manhole 3 formed therein, a so-called nose 4 described above in the introduction, a protective loop 5 in which some superheaters 7 are hung. And a loop 6.

The superheater 7 consists of one of the parts with particular advantages to be investigated in connection with the inspection. However, it is difficult to check by forming narrow vertical passages between them, which can be several meters high and partly located above the nose 4. Some passages extend parallel to the plane shown in FIG. 1, and some passages 8 extend perpendicular to this plane. The manhole 3 is preferably arranged at least at one end of the passage 8.

The device according to the invention is shown in FIG. 1 in the form of two platforms 10 on the right and left in slightly different configurations. A common feature of the two platforms 10 is that they are identical because the components included therein are preferably composed of parts of a structure kit that can be extended to adjust to an effective state.

Each platform 10 includes grating girders 11 and stretchable flanks 12 as main components.

The girder 11 is hung horizontally parallel to each other outside the passageway and within the passageway 8 by a chain 13 which is hung downwardly by an electric telfer 14 mounted on the loop 6 of the container 1. have. The telphers are remotely controlled and can be advantageously used, for example, to initially draw the girders into the container 1 through a suitable manhole 3. The lower girder 11 is hung on the overlapping girder 11 by steel bands 15 arranged on both sides of the girder 11. The suspension of the upper and lower girders 11 will be described in more detail later with reference to FIGS. 4 to 6 and will be described later with reference to FIGS. 2 to 4.

The stretchable flank 12 shown in FIG. 1 is located on the girder 11 suspended downward at the same level and lies perpendicular to the girder 11 as described above. They are therefore also arranged perpendicular to the passage 8 and can be used to reach the passage (parallel to the plane of the drawing) and perpendicular to this passage 8. The structure of the flank 12 will be described in more detail later with reference to FIGS.

FIG. 2 is a side view of the grating girder 11 component, FIG. 3 is a plan view of the corresponding component, and FIG. 4 is a sectional view of the plurality of girders 11. The girder 11 having a rectangular cross section comprises four longitudinal main pipes 16 formed of aluminum and arranged at the corners of the cross section. The thinner pipe or rod 17 of the grid structure, which holds the main pipe 16, extends zigzag between the main pipes 16. At the top of the two upper main pipes 16 is attached a footboard plate 18 having a grooved anti-skid upper side 19. At the end of the girder 11 a coupling means (not shown) of the prior art type can be arranged for possible extension of the girder 11 or for example for the connection of the ladder.

For the suspension of the girder 11, as described above, it is composed and used with a steel band 15 for the lower girder 11 and a chain 13 for the upper girder 11. The chain 13 and the steel band 15 are attached to the girder 11 by enclosing holders 20, 21, as can be clearly seen in FIG. 4, which holder 20 is in particular an upper girder 11. 5 is shown in more detail in FIG. 5, the holder 21 is intended for the lower girder 11 and is shown in more detail in FIG. 6.

The holder 20 comprises two generally C-shaped halves 22, 23 which open to face each other, which are formed according to the cross-sectional contour of the lattice girder 11, which halves are made of bent steel band material. The halves 22, 23 have lugs 24, 25 at their upper ends, their lugs 26, 27 at their lower ends, and the upper ends are composed of band material of vertically bent portions. And the lower band consists of a tubular sleeve consisting of a tubular sleeve welded to the band material. The cotter pin 28 is moved through the lugs 24 and 25 to attach the chain 13 described above, which is fitted with a shackle that can be hooked to the hook 30 at the lower end of the chain 14. 29) is part of the fit. Lugs 26 and 27 at the lower end are preferably connected to each other by locking cotter pins 31 which are moved and locked through the tubular sleeve.

The holder 21 comprises two generally C-shaped halves 32, 33 which are open to face each other, which are formed along the cross-sectional contour of the lattice girder 11, which halves are formed of bent steel band material. The halves 32, 33 have lugs 34, 35 at their upper ends and lugs 36, 37 at their lower ends, both upper and lower ends being tubular sleeves welded to the band material. It is composed. Lugs 34 to 37 are preferably connected to each other by locking cotter pins 38 which move and lock through the tubular sleeve.

In order to attach the above-described steel band 15 to the side of the girder 11, the steel band 15 has holes 39 formed at their ends, and both the holders 20 and 21 are at their sides. The locking cotter pin 41 is formed and can be moved to have a hole 40 that is locked.

FIG. 7 is a plan view of the stretchable flank 12 component, FIG. 8 is a side view of the corresponding component, and FIG. 9 is a cross-sectional view of the component of the flank 12 corresponding to the state of FIG. The flank 12 consists of a U-shaped cross section 42, 43 which is superimposed on the outer and inner sides and has an inner curved end portion 44, 45 which is open to be directed downward and which provides good load bearing capacity to the flexible flank 12. Grant. For safety reasons, the cross sections 42, 43 have grooved anti-slip surfaces 46, 47 and draw-limit means for limiting possible protrusion.

The draw-limiting means 48 comprises two pins 50 which are deflected by a leaf spring 49, which pins U-shaped cross section 42 from the U-shaped cross section 43 for locking. , 43, is arranged to move automatically through the lock openings 51, 52 in the leg. To allow simple release, the pin 50 is firmly connected to a cable 53 which is connected to the pin 50 to allow simultaneous release of the two pins 50.

The cross sections 42, 43, preferably the outer cross section 42, on which the end lies on the girder 11, may have one or more holes for insertion of the locking cotter pin, for safety reasons, the pins being girder ( Is arranged to engage a corresponding hole in the upper side of 11).

Those skilled in the art will appreciate that the above-described embodiments of the present invention may be modified in various ways within the scope of the claims and that the aforementioned platform depends on the number of girders 11 and the number of flanks 12 arranged below each other. It will be appreciated that (10) is performed in a vessel and scaffolding is useful for most of the operations required.

Claims (17)

A device for facilitating the new construction and internal inspection and repair of large vessels (1), such as recovery boilers and tanks, The device is vertically adjustable by means of a suspension cord 13 suspended downwardly in the loop 6 of the container 1, the two or more parallel spaced to which the suspension cord 13 is attached. A platform 10 constructed from a girder 11, wherein at least one flank 12 is arranged vertically on the girder 11 to interconnect the girder and overlie the girder 11 at least Overlapping, In the novel configuration of the large container and the device to facilitate the internal inspection and repair, The girder 11 is characterized in that the first lattice girder 11 can be adjusted individually and vertically, having the flat upper side to which the suspension cord 13 is attached and forming the footboard 18. New construction of large containers and devices to facilitate internal inspection and repair. The method of claim 1, The girder 11 has a rectangular cross section, and the suspension cord 13 has an upper portion with fastening means 24, 25 for the suspension cord 13, which are arranged centrally, surrounding each girder 11. Characterized in that attached to the girder by the enclosing holder 20 having a side, New construction of large containers and devices to facilitate internal inspection and repair. The method of claim 2, The enclosing holder 20 consists of two generally C-shaped halves 22, 23 that are open to face each other, the halves having lugs 24 to 27 at the upper and lower ends, and the lugs Characterized in that the locking cotter pins 28 to 31 are movable to lock the halves 22 and 23 to each other, New construction of large containers and devices to facilitate internal inspection and repair. The method of claim 3, wherein Said lugs 24, 25 form fastening means at the upper ends, New construction of large containers and devices to facilitate internal inspection and repair. The method according to claim 3 or 4, Said halves 22, 23 are formed of a steel band material that is bent into the cross-sectional contour of the girder 11, New construction of large containers and devices to facilitate internal inspection and repair. The method according to any one of claims 1 to 5, Characterized in that the one or more additional girders 11 of the same shape as the first lattice girder 11 is suspended under one or more of the girders at a constant distance, New construction of large containers and devices to facilitate internal inspection and repair. According to claim 6, The additional girder 11 has a rectangular cross section and encloses the girder and is enclosed in an overlapping girder 11 by a suspension band 15 arranged on both sides of the girder 11. Characterized in that hanging by, New construction of large containers and devices to facilitate internal inspection and repair. The method of claim 7, wherein The enclosing holder 21 consists of two generally C-shaped halves 32, 33 which are open to face each other, the halves having lugs 34 to 37 at the upper and lower ends of the halves. , Characterized in that the locking cotter pin 38 is movable through the lug to lock the halves 32, 33 to each other, New construction of large containers and devices to facilitate internal inspection and repair. The method according to claim 7 or 8, Said halves 32, 33 are formed of a steel band material that is bent to the cross-sectional contour of the additional girder 11, New construction of large containers and devices to facilitate internal inspection and repair. The method according to any one of claims 2 to 5 and 6 to 8, The suspension band is a steel band 15 having a hole 39 at its end, through which a locking cotter pin 41 is located on the side of the enclosing holder 20, 21 of the associated girder 11. Characterized by being movable for locking engagement in the corresponding hole 40, New construction of large containers and devices to facilitate internal inspection and repair. The method according to any one of claims 6 to 10, One or more additional girders 11 are suspended below two spaced girders 11 at a constant distance, one or more flanks 12 arranged perpendicularly to the girders and interconnected with the girders 11, the flanks being Characterized in that it lies on the additional girder 1 and covers at least a portion of the girder, New construction of large containers and devices to facilitate internal inspection and repair. The method according to any one of claims 1 to 11, Characterized in that the at least one flank 12 is stretchable, New construction of large containers and devices to facilitate internal inspection and repair. The method of claim 12, The stretchable flank 12 consists of a U-shaped cross section 42, 43 which overlaps outwardly and inwardly and has an inner curved end 44, 45 that is open for downward orientation, the protrusions of which are drawn- Characterized in that limited by the limiting means 48, New construction of large containers and devices to facilitate internal inspection and repair. The method of claim 13, The draw-limiting means 48 comprises one or more spring-deflected pins 50, the pins of the U-shaped cross sections 42, 43 from the inner U-shaped cross sections 43 for locking. Characterized in that it is arranged to move automatically through the lock openings (51, 52) in the leg,  New construction of large containers and devices to facilitate internal inspection and repair. The method according to claim 13 or 14, The outer U-shaped section 42 that is superimposed over the going in the end portion further 11 is at least one vertical hole for insertion of a locking cotter pin which is arranged to be engaged in a corresponding hole in the upper side of the girder (11) Characterized in that, New construction of large containers and devices to facilitate internal inspection and repair. The method according to any one of claims 1 to 15, The suspension cord is characterized in that it is a chain 13 hanging downwards on an electrically operated telpher 14 arranged on the loop 6 of the container 1, New construction of large containers and devices to facilitate internal inspection and repair. The method of claim 16, The telpher 14 is characterized in that it is remotely controlled from the interior of the container 1 individually, New construction of large containers and devices to facilitate internal inspection and repair.

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