WO2024003167A1 - Dispositif de liaison pour relier des segments de flèche de la flèche d'une grue à tour - Google Patents

Dispositif de liaison pour relier des segments de flèche de la flèche d'une grue à tour Download PDF

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Publication number
WO2024003167A1
WO2024003167A1 PCT/EP2023/067700 EP2023067700W WO2024003167A1 WO 2024003167 A1 WO2024003167 A1 WO 2024003167A1 EP 2023067700 W EP2023067700 W EP 2023067700W WO 2024003167 A1 WO2024003167 A1 WO 2024003167A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure plate
fastening
section
connecting device
lateral surface
Prior art date
Application number
PCT/EP2023/067700
Other languages
German (de)
English (en)
Inventor
Thomas Heidrich
Björn-Philipp Hessenmüller
Steffen Hildenbrand
Wolfgang Ingelfinger
Stefan Reinhard
Patrick WITTECK
Original Assignee
Wolffkran Holding Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102022116387.3A external-priority patent/DE102022116387A1/de
Application filed by Wolffkran Holding Ag filed Critical Wolffkran Holding Ag
Priority to CN202380010687.4A priority Critical patent/CN117529443A/zh
Publication of WO2024003167A1 publication Critical patent/WO2024003167A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/26—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
    • B66C23/28—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels
    • B66C23/283—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels with frameworks composed of assembled elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/26—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
    • B66C23/28—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels
    • B66C23/283—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels with frameworks composed of assembled elements
    • B66C23/286—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels with frameworks composed of assembled elements with locking devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs

Definitions

  • the present invention relates to a boom of a tower crane, in particular a boom in the design of a crane element known in specialist circles as a trolley boom or trolley jib.
  • the invention further relates to lower chord connections for connecting boom segments for such a boom.
  • Booms of tower cranes usually consist of individual boom segments that are detachably connected using connecting devices.
  • Such booms have, among other design features, at least one lower chord and at least one upper chord.
  • Lower chords are preferably made from steel tubes with a square profile, upper chords from flat steel, steel tubes with a square profile or from steel tubes with a round profile.
  • the at least one upper chord serves primarily to absorb forces resulting from tensile loads and is located in the head area of a boom segment.
  • the at least one lower chord serves primarily to absorb forces resulting from pressure loads and is located in the foot area of a boom segment.
  • the boom segments have connecting devices in the areas in which they are connected to one another. These connecting devices form the front end of the at least one upper chord or the at least one lower chord for the boom segment in question.
  • trolley jibs Certain versions of tower crane booms are referred to as trolley jibs or trolley jibs because they have a track (track) and a lateral guide for include a deflection device for a hoist rope, known in specialist circles as a trolley or cat.
  • Such booms can also be used within steel construction structures, e.g. in mobile steel hall or festival hall construction, or in booms of other types of cranes, such as mobile harbor cranes or semi-stationary storage yard cranes, insofar as such steel construction structures or crane booms are made of steel constructions connected by means of a connecting device. or have cantilever segments that are based on a truss or lattice structure.
  • boom segments of a tower crane jib are usually connected to each other, i.e. assembled, preferably on the ground before the crane is put into operation.
  • boom segments are added to the boom of a tower crane that is already in operation using detachable connection techniques in order to extend it.
  • Detachable connections must therefore be suitable for both installation scenarios and be structurally designed accordingly.
  • connection techniques used to build such a boom from boom segments generally include a few easy-to-use, maintenance-free, play-free and low-wear connecting elements.
  • a boom of a tower crane is known, for example, from EP 1 728 756 B1.
  • This has a connecting device formed from pins and centering pins between two cantilever elements, separate recesses that accommodate these pins and centering pins, and fixing elements, which are in operative connection with one another and with one another, on the one hand fixing the cantilever segments to one another and, on the other hand, releasably connecting them to one another.
  • this connection device is also known as Liebherr LiConnect (see “LIEBHERR ECB LiConnect”, website brochure p.18).
  • a first disadvantage is that, due to its arrangement, the connecting device can only absorb the forces over the limited area of the end faces of the lower chords.
  • the trusses of the ECB boom located between the bottom chords do not transmit any forces within the front connection area of the segments because these trusses in the connection area are not directly tied to one another in the steel construction, in other words they are mechanically directly coupled to one another.
  • the wear pattern of a using the concept of The connecting device designed by LiConnect is correspondingly strong because the transmitted forces are introduced exclusively in a limited area via the surfaces of the end faces that are located outside the pin.
  • the resulting contact pattern is characterized by locally extremely high forces and corresponding stress peaks.
  • transverse forces generated by the rotation of the tower crane in the foot area of the boom and the resulting moments cannot be completely absorbed by a connecting device designed in this way, or local counter moments can be generated in particular by the pin, which permanently leads to incremental deformations of the boom segment in its foot area. but in particular the connecting device can lead.
  • the cantilever construction must therefore be made of solid steel in the lower chords and with regard to the integration of these into the truss structure of the cantilever segment.
  • centering bolts are placed on the cross member of a lower chord to be connected, which engage in a complementary manner in round cutouts in the front ends of the cross member of another lower chord to be connected.
  • These centering bolts are designed as cylinders with a stepped section and two directly on top of each other following, conically shaped areas with different flank pitches, the cylindrical part within the front end taking on the function of a sealing section.
  • the releasable connection device between the lower chords is represented by a locking unit which consists of several links, the locking unit being in spatial proximity but at a distance from the respective front centering bolt.
  • Each connecting unit comprises a clamping bolt which is mounted so as to be displaceable in the longitudinal direction of the boom segment, parallel to the lower chord, along a carriage welded to the cross member.
  • the respective connecting effect between the lower chords is achieved by sliding the clamping bolt along the carriage into the round cutout of the front cross member of the other boom part and inserting a locking wedge into the head of the clamping bolt.
  • Another disadvantage is that the end trusses located between the bottom chords on the foot side can only absorb local and limited forces within the front connection area of the segments, because these end traverses are not directly coupled to one another over a large area in the steel construction in the connection area. Due to its arrangement at a distance from the end face of the lower flanges, the connecting device primarily absorbs axial bending moments and only to a small extent transverse forces, without being able to generate corresponding bearing forces or counter moments. The forces acting on the lower chord connection are transferred between the locations of the frontal fixation and the locations of the connection, which in turn results in greater steel construction effort in order to be able to absorb these redirected forces without deforming the foot-side boom area and the connecting elements. Another disadvantage is the relatively complex structure of this connecting device, which has many elements that must be secured against loss.
  • the forces and moments that change during crane operation should ideally be counteracted by creating local, adjustable bearing forces and counter-torques. Disclosure of the invention
  • a connecting device in particular for connecting boom segments of a boom of a tower crane, comprising:
  • first fastening part is provided with a detachable, anti-twist connecting device for fastening to the first pressure plate
  • the second fastening part is provided with a centering mandrel for fastening to the second pressure plate, which has a radial, in particular continuous securing groove for receiving a plug-in wedge;
  • At least one centering sleeve for insertion into a corresponding through opening in the second pressure plate, which has an internal cross section in order to receive the second fastening part in a form-fitting manner.
  • the at least single first through opening located in the first pressure plate can be designed in such a way as to accommodate the connecting bolt in a form-fitting manner, particularly in the axial and radial directions of a through opening.
  • the through opening located in the second pressure plate can be designed in such a way as to accommodate the centering sleeve in a positive and frictional manner in the axial and radial directions of the through opening in the second pressure plate.
  • the connecting device according to the invention is characterized in particular by the fact that its elements have the function of a fixed screw connection with the function of a Detachable plug connection is advantageously combined with one another by means of adjustable centering and fixing elements.
  • the proposed connecting device puts predominantly standard parts into active connection with a few special parts, which results in a high degree of standardization and predictability in the design of the individual elements and thus ultimately a high functional reliability of the boom.
  • the lower chords of the boom segment are connected to one another on the front side, preferably via at least two pressure plates.
  • the at least two pressure plates which close the end faces of the boom segments in their foot areas, they take on the function of two mechanically connected cross beams.
  • the lower chords are tied together using a steel structure using these cross beams, which can have the same external geometry and can therefore double the force and moment-absorbing cross sections in the foot area of the boom segments.
  • the construction of the boom segments is thereby stiffened in an area in which maximum bending and transverse forces as well as moments act on the lower chords.
  • a maximum effective transfer surface can be formed, via which the connection between the lower chord areas of two boom segments is established and which is not only located in the limited area of the surfaces directly in the area of the front ends of the lower chords, but over a maximum front foot area, which extends in a plane that is transverse or angled to the longitudinal axis of the boom.
  • the connecting device comprises at least one connecting bolt, which is preferably designed in one piece and rotationally symmetrical, a first through opening located in a first pressure plate and receiving the connecting bolt, a centering sleeve arranged between the connecting bolt and a second through opening of a second pressure plate, and a plug-in wedge.
  • the elements of the connecting device mounted on the boom segments to be connected complement each other.
  • a first boom segment points in the foot area of the front end has a first pressure plate.
  • This first pressure plate accommodates the connecting device, by means of which a second pressure plate present in a second boom segment to be connected is connected.
  • the first and second pressure plates connected by the connecting device lie primarily against one another; any frictional connection that occurs between the first and second pressure plates can be neglected when determining the connecting forces generated between the boom segments by means of the connecting device.
  • the first fastening part has a second cylindrical lateral surface section, which in particular directly adjoins the second fastening part.
  • the first fastening part can have a screw thread section which adjoins the second cylindrical lateral surface section in order to fasten the first fastening part to the first pressure plate by screwing.
  • the second cylindrical lateral surface section can be provided with an anti-rotation device, which is in particular designed with a centering pin protruding from the second cylindrical lateral surface section.
  • first pressure plate has a plurality of first through-openings and the second pressure plate has a plurality of corresponding second through-openings.
  • Co-rotating recording then means the identical (preferably parallel with respect to their longitudinal directions) orientation of the mounted connecting bolts, in such a way that the connecting bolts located in and on the pressure plates point in the same direction.
  • At least one further connecting bolt is provided with a first fastening part for fastening to the second pressure plate of the second boom segment and with a second fastening part for fastening to the first pressure plate of the first boom segment, the first fastening part having a releasable connecting device for fastening is provided on the second pressure plate, the second fastening part being provided with a centering mandrel for fastening to the first pressure plate, which has a radial, in particular continuous securing groove for receiving a plug-in wedge, and a centering sleeve is provided for insertion into a corresponding through opening in the first pressure plate is, which has an internal cross section in order to accommodate the second fastening part in a form-fitting manner.
  • first and second pressure plates each have at least one first through-opening and at least one second through-opening.
  • Alternating mounting means the orientation of the connecting bolts in such a way that at least two of the connecting bolts located in and on the pressure plates point in opposite directions.
  • the at least one first through opening can be widened in the form of a groove in its upper region in order to accommodate a centering pin, which advantageously fixes the connecting bolt against rotation while it is screwed to the pressure plate. This ensures that the insertion of the plug-in wedge into a locking groove located in the head of the connecting bolt can always be done vertically from above, which is an advantage when installing the boom segments on the floor on the construction site and in particular when installing the boom segments during crane operation, in a partly airy manner height.
  • the connecting bolt is provided on one end in a first section (screw thread section, characterized by a first cross section, in particular with a metric thread of normal pitch.
  • a second section of the connecting bolt has a first shoulder immediately adjacent to the first section (screw thread section), from which the first cross section of the connecting bolt widens towards a second cross section of the connecting bolt.
  • the first and second sections form the first fastening part of the connecting bolt.
  • a first contact surface is formed between the first cross section of the connecting bolt and the second cross section of the connecting bolt, which can also have a non-round shape and which has a first chamfer in its upper region. This chamfer makes it easier to thread the connecting bolt into the at least one first through opening of the first pressure plate, which is particularly beneficial for mounting the connecting bolt.
  • the first and second sections of the connecting bolt are inserted into the at least one first through opening of the first pressure plate.
  • a lock washer is placed on the part of the first section (screw thread section) protruding from the mounting side of the first pressure plate and ensures that a castle nut screwed onto the screw thread section rests flatly on the mounting side of the first pressure plate. This advantageously ensures that the screwing forces are applied uniformly and predictably to the mounting side of the first pressure plate over a large cross section.
  • the lateral surface of the second section of the connecting bolt ends at a second shoulder and, due to its full-surface contact in the at least one first through opening of the first pressure plate, ensures, on the one hand, a radial fixation of the connecting bolt in the first pressure plate and, on the other hand, a low-play connection between the connecting bolt and the first pressure plate.
  • the third section (first cylindrical lateral surface section) of the connecting bolt is characterized by a second lateral surface. This lateral surface merges into a fourth section of the connecting bolt, which is referred to as the head area.
  • the third and fourth sections form the second fastening part of the connecting bolt.
  • the connecting bolt can have a section in its head area that tapers in the direction of the second fastening part and is adjacent to a first cylindrical section Connect the lateral surface section, wherein the first cylindrical lateral surface section can be received in the centering sleeve, in particular in a form-fitting manner, in an assembled state.
  • the tapering section located in the head area of the connecting bolt can be characterized by a third lateral surface, which is designed as a cone and thus forms a centering mandrel.
  • the centering mandrel ends in a second chamfer, which also forms the other end of the connecting bolt.
  • the second chamfer together with the surface of the cone of the centering mandrel of the connecting bolt, facilitates the introduction of the connecting bolt and the centering sleeve into the at least one second through opening of the second pressure plate. This makes the assembly of boom segments to be connected considerably easier, which particularly benefits safe handling and assembly of the same.
  • the centering sleeve has a completely or partially circumferential flange, which can be provided at an axial end of the centering sleeve and, in an assembled state, is arranged in the direction of the second fastening part.
  • This centering sleeve can thus be designed as a collar bushing and is characterized by a first sleeve section which has the shape of a tube, which does not necessarily have to be round, and an inner wall and an outer wall with an intermediate surface, which is not necessarily an annular surface must be trained.
  • a chamfer can be arranged between the surface and the inner wall, which, as an insertion aid, makes it easier to insert the centering sleeve onto the second lateral surface of the connecting bolt, complementary to the cone of the centering mandrel of the connecting bolt.
  • first sleeve section of the centering sleeve there is an undercut, which is followed by a second sleeve section of the centering sleeve.
  • This second sleeve section is characterized by a circumferential flange with an inner and outer flange surface.
  • the flange surfaces of the flange thus have a first and a second contact surface as well as an inner diameter and an outer diameter and thereby give this second sleeve section the shape of a collar.
  • This collar is cut off on one side at the outer cross section, which leaves more scope in the structural steel design of the boom segment.
  • the centering sleeve is, as described above, arranged between the lateral surface of the first cylindrical lateral surface section of the connecting bolt and the wall of an at least single second through opening, which is located in the second pressure plate.
  • the centering sleeve is dimensioned in the axial and radial directions so that it achieves full-surface support over a maximum contact surface on the one hand for the second lateral surface of the connecting bolt and on the other hand for the wall of the at least single second through opening of the second pressure plate.
  • a flat and step-free contact of the centering sleeve can be created by an inwardly directed undercut radius between the first and the second sleeve section of the centering sleeve.
  • a further advantage of the connecting device can be, in particular, the axial force input via the engaging inner and outer contact surfaces of the centering sleeve in the second sleeve section, by means of which the axial preload caused by the centering mandrel and the plug-in wedge ensures a uniform and maximum surface pressure between the first and the second printing plate allows.
  • the elastic centering sleeve as well as the elastic pressure plates result in improved bending, transverse force and moment absorption as well as optimized restoring behavior of the connecting device.
  • a further advantage of the centering sleeve can consist in particular in its design of a completely or partially circumferential flange, which can be designed as a collar as described above.
  • the collar located in the second sleeve section is characterized in particular by an inner and outer flange surface.
  • the contact surface that forms between the inner diameter and the outer diameter of the collar can be designed depending on the area and thus the area-related resistance of the first and second pressure plates. Due to its radial and surface contact in the first and second sleeve sections, the centering sleeve ensures a large-area introduction and uniform distribution of the axial and radial preload forces into the second and/or first pressure plate, which are generated by the tensioning of the plug-in wedge within the securing groove of the centering mandrel. Due to the possibility of adapting the outer cross section of the centering sleeve in the second sleeve section, i.e.
  • the flange of the centering sleeve is provided with one or more fastening devices for secure fastening to the first and/or second pressure plate.
  • a plug-in wedge is used to secure the connecting device, which is inserted in particular into a securing groove located in the conical centering mandrel of the connecting bolt, preferably from above.
  • the plug-in wedge can be designed in different lengths, so that its contact surface can be adapted to the outer flange surface of the second sleeve section of the centering sleeve.
  • Another advantage of the connecting device is that it is designed to be adjustable. The adjustment is achieved in particular by means of the plug-in wedge, which can be adjusted within limits.
  • the plug-in wedge is inserted into the free space formed between the second lateral surface of the connecting bolt and the wall of the at least one second through opening Continuous locking groove located in the conical area of the centering mandrel of the connecting bolt is inserted.
  • the plug-in wedge is solid and can have different outer contours in its respective contact surfaces.
  • the outer contour of a first contact surface forms the head-side termination and absorbs the clamping forces, preferably introduced by hammer blows, during assembly of the connecting device.
  • the outer contour of a second contact surface lies directly on the outer flange surface of the centering sleeve and introduces axial and radial clamping forces into it by means of positive locking.
  • the outer contour of a third contact surface can have a rounded shape.
  • This third contact surface can form an angle with respect to the second contact surface and, within the securing groove of the connecting bolt, causes the plug-in wedge to be forced against the inner and outer walls of the securing groove.
  • the plug-in wedge When assembled, the plug-in wedge can be secured against upward migration by a safety plug, which can be designed in the form of a spring clip (standard part).
  • the safety plug can be inserted into at least one locking hole in the lower leg area of the plug-in wedge in order to secure the plug-in wedge in its respective position within the locking groove.
  • the strength of the lower chord connection can be permanently high due to the plug-in wedge slipping due to its own weight or by mechanical readjustment of the plug-in wedge, in particular by means of hammer blows level are maintained.
  • the connecting device can be modeled on a fixed bearing. According to a further aspect, it has proven to be advantageous, in a preferred embodiment, to relieve the load on the connecting device according to the invention, in its form as a fixed bearing, by means of a further cantilever connection.
  • a further cantilever connection can be formed by an additionally introduced fixing device, which can be designed as a floating bearing in addition to the fixed bearing of the connecting device.
  • the fixed bearing can be located outside the front end of the lower chords.
  • the floating bearing can be arranged on or within the front end of the lower chords.
  • the end faces of the lower chords are understood to be the contact surfaces which form directly in the joints above the ends of the lower chord tubes, transversely to the longitudinal axis of the boom.
  • the lower chords of two boom segments to be connected and in particular the joints above the ends of the lower chord tubes are, on the one hand, fixed in position to one another and to one another and, on the other hand, permanently and releasably connected to one another by means of adjustable connecting forces.
  • a movable trolley can be arranged to be movable along the substructure.
  • loads hanging on the trolley can exert a maximum bending moment on the pressure plates in the front end area of the lower chords (boom chords) while the trolley is traveling over the areas of the boom connections, i.e. the boom joints.
  • This can lead to permanent, local deformations of the frontal areas of the boom joints, in such a way that at least one step can be formed between the oppositely positioned and adjacent boom joints. Since the lower belts usually have running surfaces for the trolley, such steps can lead to mechanical shocks during trolley travel under load.
  • the above lower chord connection is provided with the connecting device, wherein the lower chord connection connects two lower chords of the boom segments, ie a lower chord of the first boom segment and a corresponding lower chord of the second boom segment, with one another on the front side of each of the two lower chords
  • Fixing device is provided to secure the lower chords against displacement transversely to their axial direction. It has therefore proven to be advantageous if a fixing device additionally introduced in the highly loaded lower flange area of the pressure plate can support the centering effect of the connecting device.
  • the fixing device leads to additional relief of the connecting device and to a permanent and low-wear fixation of the lower chords to one another and to one another in the area of the joints, which are located in the immediate area above the front ends of the lower chord tubes.
  • the fixing device can in particular be arranged centered in the surfaces of the front ends, i.e. the joints of the lower chords. Further arrangements of the fixing device within the lower chord connection are conceivable, for example in an area above or below or to the side of the structural center of the respective lower chord.
  • fixation device can include:
  • the first fastening section can be provided with a threaded section for fastening the screw mandrel to a threaded hole in the first pressure plate.
  • the lateral surface section of the second fastening section is received in the through opening in a form-fitting and friction-locking manner.
  • At least one further fixing device comprising:
  • a further advantage of the new lower flange connection is the introduction of an additional fixing device.
  • the elements of the fixing device mounted on the boom segments to be connected complement each other.
  • a first boom segment has a first pressure plate in the foot area of its front end.
  • This first pressure plate accommodates the previously described connecting device and the fixing connection, by means of which a second pressure plate present in a second boom segment to be connected is connected.
  • the first and second pressure plates connected by the connecting device and by the fixing device lie against each other predominantly in a form-fitting manner and over the entire surface; any frictional connection that occurs between the first and the second pressure plate can be neglected when determining the connecting forces generated between the boom segments by means of the connecting device and the fixing device.
  • the at least one fixing device has a preferably one-piece and rotationally symmetrical screw mandrel with a first and a second fastening section, a threaded hole located in a first pressure plate and receiving the first fastening section, and a further through opening located in the second pressure plate and receiving the second fastening section and a socket arranged between the second fastening section and the further through opening.
  • the first fastening section of the fixing device has a threaded section which is located directly on a preferably cylindrically formed lateral surface section of the second fastening section of the fixing device.
  • the first fastening section can be fastened by means of the threaded section by screwing into a threaded hole located in the first pressure plate.
  • a lateral surface section and a head region can be formed, wherein the lateral surface section can in particular have a cylindrical shape and the head region can in particular have a hexagonal profile. It is also conceivable that the lateral surface section and the head area can have a polygonal, for example triangular, square or pentagonal shape.
  • a chamfer can be formed between the head area and the lateral surface section of the second fastening section. The chamfer can facilitate the insertion of the lateral surface section of the second fastening section into a socket with a complementary geometry.
  • the fixing device can comprise a socket, which can be arranged within a corresponding through opening in a second pressure plate.
  • This through opening can in particular be designed as a bore, which in particular can have a round profile.
  • the bushing can in particular be designed as a replaceable bushing, and can in particular have the shape of a tube, which does not necessarily have to be round and has an inner wall and an outer wall with an intermediate surface, which does not necessarily have to be designed as an annular surface.
  • a chamfer can be arranged between the surface and the inner wall, which serves as an insertion aid complementary to the chamfer of the screw mandrel and makes it easier to thread the lateral surface of the screw mandrel during assembly.
  • a second end of the bushing can be arranged directly in front of a stiffening plate and can find a spatial stop there. By means of this spatial stop, the bushing is secured in its longitudinal direction against migration into the rear area of the lower flange.
  • the stiffening plate serves, in the manner of a bulkhead, on the one hand to stiffen the lower chord in the indirect area of the connection between two lower chords and, on the other hand, to close the lower chord against penetrating water and the associated corrosion of the rear area of the lower chord.
  • first pressure plate has a plurality of first through-openings and the second pressure plate has a plurality of second through-openings corresponding to the first through-openings and one has another through opening.
  • Co-rotating recording then means the identical (preferably parallel with respect to their longitudinal directions) orientation of the mounted connecting bolts and screw mandrels, in such a way that the connecting bolts and screw mandrels located in and on the pressure plates point in the same direction.
  • At least one further screw mandrel is provided with the first fastening section for fastening to the second pressure plate of the second cantilever segment and with the second fastening section for fastening to the first pressure plate of the first cantilever segment
  • the first fastening section of the further screw mandrel in particular with is provided with a metric thread of normal pitch for fastening to the first pressure plate
  • the second fastening section of the further screw mandrel being provided with a lateral surface section for releasable fastening in a further through hole in the second pressure plate
  • a bushing for insertion into the further through opening in the second Pressure plate is provided, which has an internal cross section with a corresponding shape in order to accommodate the lateral surface portion of the second fastening portion of the screw mandrel in a positive and frictional manner.
  • FIGS 1a, 1b perspective overview representations of frontal embodiments of the tower crane boom segment in the unassembled state
  • FIGS. 2a, 2b, 2c perspective overview representations of the foot area of two boom segments connected by means of the lower chord connection according to one embodiment
  • Figure 2d shows a perspective overview representation of the foot area of two boom segments connected by means of the lower chord connection according to a further embodiment
  • Figures 3a, 3b perspective representations of printing plates according to one
  • Embodiment wherein the pressure plates are detached from the truss or lattice structure of the boom segment in individual perspective;
  • Figure 3c shows a side view and perspective view of a printing plate according to a further embodiment, the printing plate being seen in individual perspective from the truss or lattice structure of the
  • Figure 4 shows a perspective overview representation of elements of the lower chord
  • Figure 5a shows a perspective view of the elements of the lower chord connection according to a preferred embodiment as well as the pressure plates connected by means of the lower chord connection of a preferred embodiment
  • Figure 5b is a perspective view of the elements of the lower chord connection according to a further embodiment as well as the pressure plates connected by means of the lower chord connection of a further embodiment;
  • Figure 6 shows a sectional view of the assembled elements of the lower chord connection as well as the lower chords and the pressure plates
  • Figure 7 shows a side and perspective view of the connecting bolt
  • Figures 10a, 10b perspective overview representations of the end faces of preferred embodiments of the tower crane boom segment in the unassembled state
  • Figure 11a shows a sectional representation of the foot area of two boom segments connected by means of the connecting device and the fixing device according to a preferred embodiment
  • Figure 11b shows a section of the assembled elements of the fixing device and the connecting device according to a preferred embodiment of the lower chord connection as well as the lower chords and the pressure plates;
  • Figure 12 shows a sectional view of the assembled elements of the fixing device according to a preferred embodiment of the lower chord connection, as well as the lower chords and the pressure plates;
  • Figures 13a, 13b perspective representations of printing plates according to a preferred
  • Embodiment of the lower chord connection whereby the pressure plates are separated from the truss or lattice structure of the boom segment in an individual perspective.
  • Figures 1a, 1b show connection areas of two embodiments of a boom segment 1, which include an upper chord 2, a final upper chord connection 21a and an end face of a pressure plate 5 connecting and closing the lower chords 3.
  • the illustrated elements of the upper chord connection 21a of a first boom segment 1 are connected to a complementary element of an upper chord connection 21b of a second boom segment 1b (not shown).
  • At least one lower chord connection with a connecting device 4a of a first boom segment 1a is attached to the pressure plate 5 for transport purposes.
  • the elements of the at least one lower chord connection are located in the foot area of the front end of the boom segment 1a and outside a front end 51 of the lower chords 3.
  • Figures 2a, 2b, 2c show the foot area of two boom segments 1a, 1b connected to each other by means of the lower chord connection and the integration of these foot areas into the truss or lattice structure of the respective boom segment 1a, 1b in different ways spatial perspectives.
  • the pressure plates 5a, 5b lie directly against one another with their end faces 53 and are flush with one another at the end ends 51 (not visible in the assembled state in this illustration) of the lower chords 3.
  • the at least one lower chord connection of this preferred embodiment is mounted on the pressure plates 5a or 5b and is located in spatial proximity to the lower chord 3 in the foot area of the boom segment 1a, 1b.
  • the heads of locking screws are indicated, which are located on the outer flange surface 75 of the flange 70 of the centering sleeve 7 in bores 78 (not shown) and by means of which the centering sleeve 7 is on the mounting side 52 of the pressure plate 5a located standard threads (not shown) and thus secure them against loss and / or twisting.
  • the castle nut 10 and the washer 9 are shown as elements of the lower flange connection 4, which are located on the mounting side 52 of the pressure plate 5b.
  • Figure 2d shows the foot area of two boom segments 1a, 1b connected to each other by means of the lower chord connection and the integration of these foot areas into the truss or lattice construction of the respective boom segment 1a, 1b in a spatial perspective.
  • the pressure plates 5c lie directly against one another with their end faces 53 and are flush with one another at the end ends 51 (shown in dashed lines) of the lower chords 3.
  • the elements of the at least one lower chord connection of this further embodiment are mounted on the pressure plates 5c on the mounting side 52 and are located in the spatial proximity of the lower chord 3 in the foot area of the boom segment 1a, 1b.
  • Figure 3a shows a pressure plate 5a detached from the truss or lattice construction of the respective boom segment 1b, 1b, according to the preferred embodiment.
  • the second through openings 56 located in the pressure plate 5a each receive centering sleeves 7 (not shown) on their walls.
  • Figure 3b shows a pressure plate 5b detached from the truss or lattice construction of the respective boom segment 1a, 1b according to the preferred embodiment.
  • the first through openings 54 located in the pressure plate 5b are each widened in the form of a groove in their upper region by a recess 55.
  • the first through openings 54 located in the pressure plate 5b receive the lateral surfaces 63 (second lateral surface section) of the connecting bolts 6 (not shown) on their walls.
  • the pressure plate 5b represents a contact surface for the lock washer 9 (not shown) on the mounting side 52.
  • Figure 3c shows a pressure plate 5c detached from the truss or lattice structure of the respective boom segment 1a, 1b, according to a further embodiment.
  • a first through opening 54 located in the pressure plate 5c is widened in the form of a groove by a recess 55 in its upper region.
  • the first through opening 54 located in the pressure plate 5c receives the lateral surface 63 (second lateral surface section) of the connecting bolt 6 (not shown) on its wall.
  • a second through opening 56 located in the pressure plate 5c receives the centering sleeve 7 (not shown) on its wall.
  • the pressure plate 5c represents a contact surface for the lock washer 9 (not shown) on the mounting side 52.
  • the front end areas 51 represent the outer end areas of the pressure plate 5a, 5b and 5c, which lie in the front end area of the lower chords 3 (not shown).
  • Figure 4 shows elements of the lower chord connection 4a detached from the truss or lattice construction of the respective boom segment 1a, 1b in the unassembled state (exploded view) outside of their engagement in the respective pressure plate 5a, 5b or 5c.
  • the first fastening part of the connecting bolt 6, which can be inserted into the first through opening 54 and the groove-like extension 55 on the end face 53 of the first pressure plate 5b or 5c, is inserted during the subsequent assembly on the mounting side 52 of the pressure plate 5b or 5c by means of the screw thread section 64 (not shown) as well the washer 9 and the castle nut 10 are screwed.
  • the second fastening part of the connecting bolt 6, which can be inserted into the second through opening 56 of the second pressure plate 5a or 5c, is inserted during the subsequent assembly on the mounting side 52 of the second pressure plate 5a or 5c by means of the centering sleeve inserted into the second through opening 56 on the mounting side 52
  • Figure 5b shows a further embodiment detached from the truss or lattice structure of the respective boom segment 1a, 1b with lower chord connections and two identical pressure plates 5c in the assembled state.
  • the lower flange connections are mounted alternately on the respective pressure plate 5c and elements of the lower flange connections protrude from the respective mounting side 52 of the pressure plates 5a and 5c.
  • the end faces 53 (not visible) of the pressure plates 5c lie against one another over the entire surface, whereby the connection of the pressure plates 5c achieves a high degree of tightness by means of positive and frictional connection between the end faces 53.
  • the centering sleeve 7 receives the lateral surface 62 (first lateral surface section) of the connecting bolt 6 in the radial direction on the inner wall 71 of the first sleeve section. In the axial direction of the centering sleeve 7, the plug-in wedge 8 rests on the outer flange surface 75 of the second sleeve section.
  • the centering sleeve 7 transmits the axial preload forces generated by the connecting bolt 6 and the plug-in wedge 8 located in the securing groove 69 by means of the flange 70 formed in its second sleeve section via its outer flange surface 75 and its inner flange surface 76 to the mounting side 52 of the second pressure plate 5 (in the embodiments 5a or 5c).
  • the centering sleeve 7 transmits the pressure from the connecting bolt 6 via its lateral surface
  • Figure 7 shows the details of the connecting bolt 6.
  • first contact surface 65 and the second contact surface 66 represent the surfaces via which the axial and radial prestressing forces of the lower flange connection 4 generated by the connecting bolt 6 onto the end face 53 (not shown ) of the pressure plate 5a, 5b or 5c (not shown) and the inner wall 71 (not shown) of the centering sleeve 7 (not shown).
  • Figure 8 shows details of the centering sleeve 7.
  • a tubular first sleeve section of the centering sleeve is delimited by an inner wall 71 and an outer wall 72 as well as by a surface 73 between the inner wall 71 and the outer wall 72 and ends in an undercut 79.
  • a second The sleeve section of the centering sleeve begins from the undercut 79 and represents a circumferential flange 70 in the form of a collar.
  • the circumferential flange 70 has an outer flange surface 75 and an inner flange surface 76 as well as a side end 77.
  • Figure 9 shows the details of the plug-in wedge 8.
  • the plug-in wedge 8 lies in the mounted or inserted position (not shown) within the locking groove 69 (not shown), which is in the lateral surface 61 (third lateral surface section, not shown) of the conical centering mandrel of the connecting bolt 6 is located (not shown).
  • the outer contour 82 of the plug-in wedge 8 represents, on the one hand, the contact surface to the inwardly directed wall 610 (not shown) of the locking groove 69 (not shown) and, on the other hand, to the outer flange surface 75 (not shown) of the centering sleeve 7 (not shown).
  • the outer contour 83 represents the contact surface of the plug-in wedge 8 to the outward-facing wall 611 (not shown).
  • the outer contour 81 serves as a receiving surface for hammer blows, which are entered within the locking groove 69 (not shown) to fix and, if necessary, reposition the plug-in wedge 8.
  • the at least one securing hole 84 located in the lower region of the plug-in wedge 8 can accommodate a spring pin (standard part, not shown) for securing the plug-in wedge 8.
  • the at least one securing hole 84 lies in the inserted and set or repositioned position of the plug-in wedge 8 in a space below the securing groove 69 (not shown) of the connecting bolt 6 (not shown).
  • Figures 10a and 10b show the connection areas of two boom segments 1a, 1b according to a preferred embodiment, each of which comprises an upper chord 2, final upper chord connections 21a, 21b and the end faces 53 of a pressure plate 5 connecting and closing the lower chords 3.
  • the illustrated elements of an upper chord connection 21a of a first boom segment 1a are connected to a complementary element of an upper chord connection 21b of a second boom segment 1b.
  • Two fixing devices 4b and two connecting devices 4a of a first boom segment 1a are attached to the pressure plate 5.
  • the at least one through opening 56 is located within the pressure plate 5 in the foot area of the boom segment 1b and between the front ends 51.
  • At least one through opening 57 for receiving the screw mandrel 40 is located in the pressure plate 5 in the foot area of the boom segment 1b and within the front end area 51.
  • Figure 11a shows the foot area of two boom segments 1a, 1b connected to one another by means of the lower chord connections 4a and 4b according to a preferred embodiment in a sectional view (top view).
  • the pressure plates 5a, 5b lie directly against one another with their end faces 53.
  • the connecting devices 4a and the fixing devices 4b are mounted on the pressure plates 5a and 5b and are located in the spatial proximity of the lower chords 3 in the foot area of the boom segment 1a, 1b.
  • Figure 11b shows a section of the foot area of two boom segments 1a, 1b connected to one another by means of the connecting device 4a and the fixing device 4b according to a preferred embodiment in a sectional view (top view).
  • the connecting device 4a and the fixing device 4b are mounted on the pressure plates 5a and 5b and are located in the spatial proximity of the lower chord 3 in the foot area of the boom segment 1a, 1b.
  • the fixing device 4b comprises a bushing 45 which is arranged in the corresponding through opening 57 within the pressure plate 5a, the bushing 45 and the through opening 57 preferably having no play with one another. This ensures that the bushing 45 is, on the one hand, firmly mounted within the through opening 57 and, on the other hand, can preferably be pulled out and replaced by means of a bushing pulling tool placed on the inner wall 46 of the bushing 45.
  • Figure 12 shows a section of two boom segments 1a, 1b connected to one another by means of the fixing device 4b according to a preferred embodiment in a sectional view (side view).
  • the screw mandrel 40 has a threaded section 41 in a first fastening section.
  • the threaded section 41 is screwed into a threaded hole 58, the threaded hole 58 being arranged in the front end region 51 of the pressure plate 5b.
  • the screw mandrel 40 has a lateral surface section 42 in a second fastening section, which directly adjoins the threaded section 41.
  • the lateral surface section 42 of the screw mandrel 40 is located directly above the end face 53 of the pressure plate 5b and lies against the inner wall 46 of the bushing 45 in a form-fitting and friction-locking manner.
  • a chamfer 44 can be located between the head 43 of the screw mandrel 40 and the lateral surface section 42 of the screw mandrel 40 and can make it easier to thread the screw mandrel 40 into the socket 45.
  • the head 43 can in particular be hexagonal in shape for receiving a tool, which can be designed as an open-end wrench.
  • the outer wall 47 of the socket 45 rests directly on the wall of the through opening 57 within the pressure plate 5a.
  • the bushing 45 lies directly in front of the stiffening plate 31, which delimits the rear end area within the lower flange 3.
  • the bushing 45 is fixed in the rear end area neither to the through opening 57 nor to the stiffening plate 31, but rather to its outer wall 47 has a small excess size compared to the diameter of the through opening 57 and is releasably mounted within the rear end area by means of a press fit.
  • Figure 13a shows a pressure plate 5a detached from the truss or lattice construction of the respective boom segment 1b, 1b, according to a preferred embodiment.
  • the through openings 56 located in the pressure plate 5a each receive centering sleeves 7 (not shown) on their walls.
  • the through openings 57 located in the pressure plate 5a each receive bushings 45 (not shown) on their walls.
  • Figure 13b shows a pressure plate 5b detached from the truss or lattice construction of the respective boom segment 1a, 1b according to a preferred embodiment.
  • the through openings 54 located in the pressure plate 5b are each widened in the form of a groove in their upper region by a recess 55.
  • the through openings 54 located in the pressure plate 5b receive the lateral surfaces 63 (second lateral surface section) of the connecting bolts 6 (not shown) on their walls.
  • Metric internal threads (not shown) are embedded in the threaded holes 58 located in the pressure plate 5b, which each receive the metric external threads of the screw mandrels 40 (not shown) located in the threaded sections 41.

Abstract

L'invention concerne un dispositif de liaison, destiné en particulier à relier des segments (1) de flèche de la flèche d'une grue à tour, comportant: - au moins un boulon (6) de liaison doté d'une première partie (9, 10, 63, 64) de fixation destinée à se fixer à une première plaque (5, 5a, 5b, 5c) de pression d'un premier segment (1) de flèche et d'une seconde partie (61, 62) de fixation destinée à se fixer à une seconde plaque (5, 5a, 5b, 5c) de pression d'un second segment (1) de flèche, la première partie (9, 10, 63, 64) de fixation étant munie d'un dispositif de liaison libérable non pivotant destiné à se fixer à la première plaque (5, 5a, 5b, 5c) de pression, et la seconde partie (61, 62) de fixation étant munie d'une broche de centrage destinée à se fixer à la seconde plaque (5, 5a, 5b, 5c) de pression, ladite broche de centrage possédant une rainure (69) de fixation, en particulier une rainure de fixation continue, destinée à recevoir un coin enfichable radial (8); et - un manchon (7) de centrage destiné à être inséré dans une ouverture débouchante correspondante dans la seconde plaque (5, 5a, 5b, 5c) de pression, ladite ouverture débouchante présentant une section droite intérieure adaptée pour recevoir la seconde partie (61, 62) de fixation par complémentarité de forme.
PCT/EP2023/067700 2022-06-30 2023-06-28 Dispositif de liaison pour relier des segments de flèche de la flèche d'une grue à tour WO2024003167A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202380010687.4A CN117529443A (zh) 2022-06-30 2023-06-28 用于对塔式起重机悬臂的悬臂区段进行连接的连接装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102022116387.3A DE102022116387A1 (de) 2022-06-30 2022-06-30 Verbindungsvorrichtung zur verbindung von auslegersegmenten eines auslegers eines turmdrehkrans
DE102022116387.3 2022-06-30
EP22203025.6A EP4299501A1 (fr) 2022-06-30 2022-10-21 Dispositif de liaison pour relier des segments de flèche d'une flèche d'une grue à tour
EP22203025.6 2022-10-21

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WO2024003167A1 true WO2024003167A1 (fr) 2024-01-04

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WO (1) WO2024003167A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1468955A1 (fr) 2003-04-17 2004-10-20 Potain Dispositif d'assemblage démontable des éléments de flèche d'une grue à tour
EP1728756B1 (fr) 2005-06-02 2014-04-30 Liebherr-Werk Biberach GmbH Flèche
CN214570313U (zh) * 2020-12-31 2021-11-02 张家港市天运建筑机械有限公司 一种平头塔机起重臂的下弦连接结构
CN215364615U (zh) * 2021-07-16 2021-12-31 马尼托瓦克起重设备(中国)有限公司 一种塔机起重臂下弦杆连接装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1468955A1 (fr) 2003-04-17 2004-10-20 Potain Dispositif d'assemblage démontable des éléments de flèche d'une grue à tour
US7156245B2 (en) * 2003-04-17 2007-01-02 Potain Device for demountable assembly of the jib elements of a tower crane
EP1728756B1 (fr) 2005-06-02 2014-04-30 Liebherr-Werk Biberach GmbH Flèche
CN214570313U (zh) * 2020-12-31 2021-11-02 张家港市天运建筑机械有限公司 一种平头塔机起重臂的下弦连接结构
CN215364615U (zh) * 2021-07-16 2021-12-31 马尼托瓦克起重设备(中国)有限公司 一种塔机起重臂下弦杆连接装置

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