Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
  • E04G3/28—Mobile scaffolds; Scaffolds with mobile platforms
  • E04G3/30—Mobile scaffolds; Scaffolds with mobile platforms suspended by flexible supporting elements, e.g. cables
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
  • E04G3/28—Mobile scaffolds; Scaffolds with mobile platforms
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
  • E04G3/28—Mobile scaffolds; Scaffolds with mobile platforms
  • E04G3/30—Mobile scaffolds; Scaffolds with mobile platforms suspended by flexible supporting elements, e.g. cables
  • E04G3/305—Mobile scaffolds; Scaffolds with mobile platforms suspended by flexible supporting elements, e.g. cables specially adapted for tanks, silos or similar vessels
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
  • E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
  • E04H7/02—Containers for fluids or gases; Supports therefor

Definitions

• the present invention relates to an apparatus for facilitating new construction and internal inspection and repair of large vessels, such as recovery boilers and tanks.
• the apparatus comprises a platform which is vertically adjustably suspended by means of suspension cords hanging down from a roof of the vessel, the platform being built from at least two parallel spaced-apart girders, to which the suspension cords are attached, and at least one plank being arranged perpendicular to the girders and interconnecting the same, the plank resting on the girders and at least partly covering the same.
• Japanese Published Application JP-A-2000-054618 discloses an apparatus as stated by way of introduction, which eliminates at least one of the problems with the solution according to US-A-5, 007, 501.
• the apparatus according to the Japanese publication thus solves the problem with the initial mounting from the bottom of the vessel, but at the same time its applicability is limit- ed significantly by the fact that the footboard, which is formed of said at least one plank, extends only perpendicular to the girders. This greatly limits the applicability and safety of the apparatus when, because of an obstacle, a gap must be left between two neighbouring planks.
• the object of the invention is to improve the known apparatus according to JP-A-2000-054618 in such a manner that the remaining problems with this apparatus are eliminated and moreover a considerably more flexible and safer apparatus is provided, which for new construction, inspection and repair is universally applicable to all types of large vessels.
• the girders are individually vertically adjustable first lattice girders, to which the suspension cords are attached and which have flat upper sides forming a footboard.
• the apparatus according to the invention comprising individually vertically adjustable lattice girders, which have a built-in plank for walking, there is provided, in contrast to JP-A-2000-054618, a safe floor surface also along the girders.
• the lattice girders are insert- able in a hanging manner through manholes in the vessel at any level without necessitating setting foot upon the bottom of the vessel.
• Said at least one plank is then arrangeable in any position between two parallel suspend- ed lattice girders. It will thus be possible to inspect, from the thus provided platform, for instance all walls of a recovery boiler, i.e. also those above the above- mentioned nose, or the superheaters of this boiler all the way up to the roof of the boiler.
• the girders of the apparatus are preferably rectan- gular in cross-section, and the suspension cords are suitably attached to them by enclosing holders which enclose the respective girders and have an upper side which has a centrally arranged fastening means for each suspension cord.
• girders that are rectangular in cross-section are that they have an excellent load-carrying capacity, that, if desired, they can easily be connected perpendicular to a corresponding girder of rectangular cross-section, and that outside the vessel they are stackable in an advantageous way.
• Said enclosing holders each preferably consist of two essentially C-shaped halves, with the C openings fac- ing one another, said halves having at their upper and lower ends lugs, through which locking cotter pins are movable for locking said halves together.
• the lugs of the enclosing holders form at the upper ends said fastening means for the suspension cords. It will thus in an advantageous manner be possible to use the same locking cotter pin both for locking together the halves of the enclosing holders and for attaching a suspension cord.
• the halves of the enclosing holders are suitably made of a band material of steel bent to the cross- sectional contour of the girders .
• the apparatus according to the invention may, if desired, comprise at least one additional girder, which is of the same type as said first lattice girders and is suspended under at least one of those at a fixed dis- tance . It will thus be easy to provide a platform with several storeys .
• the additional girder suitably should be rectangular in cross-section and that it is advantageous if it is suspended by enclosing holders, which enclose the girder and which are suspended from the superposed girder by means of suspension bands arranged on both sides of the girder.
• enclosing holders preferably each consist of two substantially C-shaped halves, with the openings facing one another, said halves having at their upper and lower ends lugs, through which locking cotter pins are movable for locking said halves together.
• the last-mentioned enclosing holders suitably consist of halves which are made of a band material of steel which is bent to the cross-sectional contour of the additional girder.
• the suspension bands that are used for suspending an additional girder from a superposed girder are preferably steel bands, which at their ends have holes, through which locking cotter pins are movable for locking engagement in corresponding holes in the sides of the enclosing holders of the associated girders.
• the steel bands are also advantageous because of the good tensile strength of the steel and the fact that the holes formed therein need no extra reinforcement.
• the apparatus according to the invention can be extended further by at least one additional girder being suspended under two spaced-apart girders at a fixed distance and by at least one tele- scopic plank, arranged perpendicular to the girders, resting on the additional girders and interconnecting the same.
• Said at least one plank is preferably telescopic.
• the telescopic design makes it easier to adjust the appa- ratus to different conditions prevailing in the vessel. More specifically, the telescopic plank preferably consists of an outer and an inner mutually telescoping U section, which have downwardly directed U openings with ends curved inwards and the projection of which is limited by a pullout-limiting means.
• the advantage of the ends curved inwards is that they contribute to good mutual displaceability of the U sections since a point charge is avoided.
• the pullout-limiting means is for natural reasons necessary to prevent the two cooperating U sections from unintentionally sliding apart.
• Said pullout-limiting means suitably comprises at least one spring-biased pin, which for locking is arranged to be automatically moved from the inner U section through lock openings in the legs of the U-shaped sections.
• the outer U section has, at an end which is adapted to rest on a girder, at least one vertical hole for insertion of a locking cotter pin, which is arranged to engage in a corresponding hole in the upper side of the girder.
• the suspension cords are suitably chains hanging down from electrically operated telphers arranged on the roof of the vessel. Advantages of chains are that, in contrast to wires that are used according to US-A- 5,007,501, they cannot be untwined and that they can be handled with greater accuracy by chain telphers than wires which are wound in layers by a wire winch.
• the telphers are preferably individually remote controlled from the interior of the vessel. It will thus be easily possible to vertically adjust individual girders inside the vessel.
• FIG. 1 is side view with partly broken-away components and illustrates parts of a recovery boiler, in which an apparatus according to the invention is used;
• Fig. 2 is a side view and illustrates parts of the long side of a lattice girder;
• Fig. 3 is a top plan view and illustrates parts of the upper side of the lattice girder;
• Fig. 4 is an end view and illustrates three lattice girders arranged one above the other, which are interconnected by means of steel bands arranged on the sides;
• Fig. 1 is side view with partly broken-away components and illustrates parts of a recovery boiler, in which an apparatus according to the invention is used;
• Fig. 2 is a side view and illustrates parts of the long side of a lattice girder;
• Fig. 3 is a top plan view and illustrates parts of the upper side of the lattice girder;
• Fig. 4 is an end view and illustrates three lattice girder
• Fig. 5 is an end view and illustrates a first enclosing holder with associated locking cotter pins
• Fig. 6 is an end view and illustrates a second enclosing holder with an associated locking cotter pin
• Fig. 7 is a top plan view and illustrates parts of the upper side of a telescopic plank
• Fig. 8 is a side view and illustrates parts of the long side of the telescopic plank
• Fig. 9 is a sectional view and illustrates. parts of the upper side of the plank.
• Fig. 1 illustrates parts of a pressure vessel 1 for a recovery boiler, in which an apparatus according to the invention is used for inspection and repair purposes.
• the pressure vessel 1 in Fig. 1 has, among other things, walls 2 with manholes 3 formed therein, a so-called nose 4 mentioned by way of introduction, a protective roof 5 and a roof 6, from which a number of superheaters 7 are suspended.
• the superheater 7 constitutes one of the parts that are of special interest to be examined in connection with an inspection. However, they make such inspection difficult by forming, between them, narrow vertical passages, which may have a height of several meters and are partly positioned above the nose 4.
• the apparatus according to the invention is shown in Fig. 1 to the right and to the left in the form of two platforms 10 with slightly different configurations.
• a common feature of the two platforms 10 is that the compo- nents included therein are identical since they constitute parts of a construction kit which can be extended as desired to be adjusted to the prevailing situation.
• Each platform 10 includes lattice girders 11 and telescopic planks 12 as the main components.
• the uppermost are horizontally suspended parallel to each other both in the passages 8 and outside the same by chains 13 hanging down from electric telphers 14 mounted on the roof 6 of the vessel 1.
• the telphers are remote controlled and can advantageously be used, for instance, in order to initially pull in a girder into the vessel 1 through a suitable manhole 3.
• the lower girders 11 are suspended from the superposed girders 11 by means of steel bands 15 which are arranged on both sides of the girders 11. The suspension of both the upper and the lower girders 11 will be described in more detail below with reference to Figs 4-6, and the construction of the girders 11 will be discussed below with reference to Figs 2-4.
• Fig. 1 rest on girders 11 hanging at essentially the same level, and extend, seen from above, perpendicular to these girders 11. They are thus arranged perpendicular also to the passages 8 and can therefore be used to reach the passages (those parallel to the plane of the drawing) which are perpendicular to these passages 8.
• the construction of the planks 12 will be described in detail below with reference to Figs 7-9.
• Fig. 2 is a side view of a part of a lattice girder 11
• Fig. 3 is a top plan view of a corresponding part
• Fig. 4 is an end view of a plurality of such girders 11.
• the girder 11 which is rectangular in cross-section, is made of aluminium and comprises four longitudinal main pipes 16 arranged in the cross-sectional corners. A grid structure of thinner pipes or rods 17, which stabilises the main pipes 16, extends between these main pipes 16 in a zigzag. On top of the two upper main pipes 16, a foot- board plate 18 is attached, which has a grooved anti-skid upper side 19. At the ends of the girder 11, coupling means (not shown) of prior-art type can be arranged for a possible extension of the girder 11 or for connection of a ladder for instance. For suspension of the girders 11, use is made, as stated above, of chains 13 for the upper girders 11 and steel bands 15 for the lower girders 11.
• the chains 13 as well as the steel bands 15 are attached, as is evident from Fig. 4, to the girders 11 by enclosing holders 20, 21, of which the holder 20 is intended especially for the upper girders 11 and is shown in more detail in Fig. 5, and the holder 21 is intended for the lower girders 11 and is shown in more detail in Fig. 6.
• the holder 20 comprises two essentially C-shaped halves 22, 23 shaped according to the cross-sectional contour of the lattice girder 11, with the openings facing one another, said halves being made of a bent band material of steel.
• Said halves 22, 23 have lugs 24, 25 at their upper ends and lugs 26, 27 at their lower ends, which at the upper ends consist of vertically upwardly bent portions of the band material and which at the lower ends consist of tubular sleeves which are welded to the band material.
• a cotter pin 28 is moved through the lugs 24, 25 for attaching the above-mentioned chains 13, said cotter pin suitably belonging to a shackle 29, into which a hook 30 at the lower end of a chain 14 can be hooked.
• the lugs 26, 27 are preferably connected to each other by means of a locking cotter pin 31, which is moved through the tubular sleeves and then locked.
• the holder 21 also comprises two essentially C-shaped halves 32, 33 shaped according to the cross- sectional contour of the lattice girder 11, with the openings facing one another, said halves being made of a bent band material of steel.
• Said halves 32, 33 have lugs 34, 35 at their upper ends and lugs 36, 37 at their lower ends, which at both the upper and the lower ends consist of tubular sleeves which are welded to the band material.
• the lugs 34-37 are preferably connected to each other by means of locking cotter pins 38 which are moved through the tubular sleeves and then locked.
• Fig. 7 is a top plan view of a part of a telescopic plank 12
• Fig. 8 is a side view of a corresponding part
• Fig. 9 is a sectional view of a part of the plank 12 corresponding to the situation in Fig. 7.
• the plank 12 consists of an outer and an inner mutually telescoping
• the pullout-limiting means 48 comprises two pins 50 which are biased by means of a leaf spring 49 and which for locking are arranged to be automatically moved from the inner U section 43 through lock openings 51, 52 in the legs of the U-shaped sections 42, 43.
• the pins 50 are fixedly connected to a cable 53 which is connected to both pins 50 and thus allows simultaneous release of the two pins 50.
• the sections 42, 43 can also, for reasons of safety, at one end which is adapted to rest on a girder 11 have at least one vertical hole for insertion of a locking cotter pin, which is arranged to engage in a corresponding hole in the upper side of the girder 11.
• a locking cotter pin which is arranged to engage in a corresponding hole in the upper side of the girder 11.

Landscapes

• Architecture (AREA)
• Engineering & Computer Science (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Bridges Or Land Bridges (AREA)
• Working Measures On Existing Buildindgs (AREA)
• Movable Scaffolding (AREA)
• Conveying And Assembling Of Building Elements In Situ (AREA)
• Emergency Lowering Means (AREA)
• Load-Engaging Elements For Cranes (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=29398664

Family Applications (1)

Country Status (16)

Families Citing this family (3)

Family Cites Families (4)

• 2003
  • 2003-10-06 SE SE0302639A patent/SE525265C2/sv not_active IP Right Cessation
• 2004
  • 2004-10-06 KR KR1020067008875A patent/KR20070004534A/ko not_active Withdrawn
  • 2004-10-06 ZA ZA200602794A patent/ZA200602794B/en unknown
  • 2004-10-06 CA CA002541062A patent/CA2541062A1/en not_active Abandoned
  • 2004-10-06 AU AU2004277575A patent/AU2004277575A1/en not_active Abandoned
  • 2004-10-06 BR BRPI0415080-5A patent/BRPI0415080A/pt not_active Application Discontinuation
  • 2004-10-06 JP JP2006532234A patent/JP2007507632A/ja active Pending
  • 2004-10-06 EP EP04775511A patent/EP1685302B1/de not_active Expired - Lifetime
  • 2004-10-06 DE DE602004025725T patent/DE602004025725D1/de not_active Expired - Lifetime
  • 2004-10-06 CN CNB2004800293149A patent/CN100416019C/zh not_active Expired - Fee Related
  • 2004-10-06 DK DK04775511.1T patent/DK1685302T3/da active
  • 2004-10-06 EA EA200600674A patent/EA008309B1/ru not_active IP Right Cessation
  • 2004-10-06 WO PCT/SE2004/001420 patent/WO2005033441A1/en not_active Ceased
  • 2004-10-06 AT AT04775511T patent/ATE458878T1/de not_active IP Right Cessation
  • 2004-10-06 US US10/574,708 patent/US20070209872A1/en not_active Abandoned
• 2006
  • 2006-03-31 NO NO20061484A patent/NO20061484L/no not_active Application Discontinuation

Non-Patent Citations (1)

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