EP0999171A1 - Flèche repliable pour grue à tour - Google Patents

Flèche repliable pour grue à tour Download PDF

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Publication number
EP0999171A1
EP0999171A1 EP98830667A EP98830667A EP0999171A1 EP 0999171 A1 EP0999171 A1 EP 0999171A1 EP 98830667 A EP98830667 A EP 98830667A EP 98830667 A EP98830667 A EP 98830667A EP 0999171 A1 EP0999171 A1 EP 0999171A1
Authority
EP
European Patent Office
Prior art keywords
jib
section
crane
intermediate section
relative
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP98830667A
Other languages
German (de)
English (en)
Inventor
Constantino Dalla Benetta
Fernando Cocconcelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gru Dalbe Srl
Original Assignee
Gru Dalbe Srl
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
Application filed by Gru Dalbe Srl filed Critical Gru Dalbe Srl
Priority to EP98830667A priority Critical patent/EP0999171A1/fr
Publication of EP0999171A1 publication Critical patent/EP0999171A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • B66C23/34—Self-erecting cranes, i.e. with hoisting gear adapted for crane erection purposes

Definitions

  • the present invention refers to a foldable jib for a tower crane used in building industry.
  • a tower crane for the building industry comprises, generally, a foldable tower, divided in a lower section and an upper section pivoted together, and a foldable jib, divided in a proximal section, pivoted to the top of the tower, and a distal section pivoted to the proximal section.
  • proximal and distal sections of the jib sometimes can be provided an intermediate section pivoted both to the distal section and to the proximal section.
  • Both the tower and the jib of the crane can be opened or closed operating on control means made of, generally, hydraulic devices or cables.
  • the tower In the operative configuration, the tower will be in a vertical position relative to the base of the crane and the jib will be in a horizontal position.
  • One main problem to be solved in designing a foldable tower crane is how to obtain the opening and the closing of the distal section of the jib, relative to the proximal section, in a safe and efficient way.
  • the foldable jib of the crane comprises, between the proximal and the distal sections, an intermediate section having a shape substantially trunk-pyramidal.
  • Said trunk-pyramidal section has two of the opposite sides of the larger base pivoted to the proximal and distal sections of the jib and the smaller base pivoted to the extremities of corresponding hydraulic cylinders.
  • Said hydraulic cylinders have, moreover, the opposite extremities pivoted to the proximal and distal jib sections, in correspondence of the upper stanchions of the proximal and distal sections of the jib.
  • the opening and the closing of the crane's jib is obtained operating on the two hydraulic cylinders that, when the jib is completely open, also assume the function of horizontal tie rods, completing the trestle structure of the jib.
  • a first drawback of the system described in said Italian Patent rises from the fact that the two hydraulic cylinders, being an integral part of the load bearing structure, must be appropriately dimensioned in order to support the weight of the jib itself and the weight of the loads moved by the crane.
  • FIG. 1b it is shown schematically the jib of a tower crane in a partially open position for allowing the raising of the jib without damaging the couple of struts 61c that are positioned at the top of the tower.
  • Said cable 60 is guided by an aerial articulated structure 61a-61c provided on the top of the tower.
  • Said aerial articulated structure 61a-61c comprises, in particular, a couple of struts 61c placed triangularly and jointed at the top of the crane's tower.
  • the crane's jib according to the present invention has the advantage that it is lighter than the existing ones thanks to the use of small hydraulic cylinders.
  • actuating means for the opening and the closing of the jib comprising an active control device and a passive arrest device.
  • the foldable crane jib according to the present invention comprises three sections, respectively a proximal 11, an intermediate 12 and a distal 13.
  • said proximal section 11 is pivoted in 9 to the top of the crane's tower 1.
  • said intermediate section 12 has a substantially trunk-pyramidal shape and is pivoted in 14 to the proximal section 11 and in 15 to the distal section 13.
  • the crane 1 shown in Figure 1 comprises a tower 2 placed on a base 3 and divided in two sections, a lower 4 and an upper 5, pivoted together in 6 and in the lower part in 8.
  • An hydraulic cylinder 7 is provided for raising and lowering of the tower by opening and closing the two sections lower 4 and upper 5.
  • a metallic cable 60 guided through an aerial articulated structure 61a-61c provided on the top of the tower, is moreover provided between the base 3 and the proximal section 11 of the jib, for allowing the raising of the jib of the crane in an horizontal position relative to the tower 2.
  • proximal 11 and the distal 13 sections have a trestle structure with a triangular cross section.
  • the trestle structure of the proximal 11 and distal 13 sections is preferably realised by means of three parallel iron beams 16 placed on the vertices of the triangle and connected by metal elements 17 welded to said beams 16.
  • the beams 16 placed on the lower vertices of the triangle permit the sliding of the saddle 63 of the crane, which is trailed along the jib by means of a metallic rope (not shown) guided by pulleys 62.
  • first and second opening means for the jib.
  • Said opening means for the jib comprises, each, an active extensible device for controlling the opening and the closing of the jib and a passive extensible device for the arrest of the opening movement when the jib is in the operating configuration.
  • the active extensible devices when the jib is completely open in the operating configuration, assume preferably a configuration close to the maximum extension, so that they are not solicited by the jib's weight.
  • the active extensible devices are hydraulic cylinders 31a, 31b placed, respectively, between said proximal section 11 and said intermediate section 12 and between said intermediate section 12 and said distal section 13.
  • the hydraulic cylinders 31a, 31b have an end pivoted in 22a, 22b to a correspondent couple of brackets 23a, 23b, provided welded on the corresponding section of jib 11, 13, and the opposite end pivoted in 41a, 42b to a couple of parallel brackets 40, having a substantially trapezoidal shape, provided hanging from the smaller base of said trunk-pyramidal intermediate section 12 of the jib between the lateral walls 45 of said trunk-pyramidal intermediate section 12.
  • the hydraulic cylinders 31a, 31b have, when the jib is opened, an inclined position converging towards the top of the truncated-pyramidal intermediate section 12.
  • the passive extensible devices are made of guides 32a, 32b for sliding of pins or cursors 33a, 33b fixed to the ends of corresponding forks 48a, 48b in which are received the guides 32a, 32b when the jib is closed in the rest configuration shown in Figure 3 or opened in the operating configuration shown in Figure 9 or 10.
  • said proximal section 11 and said distal section 13 of the jib comprise a portion faced to the intermediate section 12 in which the upper stanchion 16 of the trestle structure of the jib is doubled in order to define the corresponding fork 48a, 48b.
  • Said forks 48a, 48b are joined to the upper stanchion 16 of the corresponding section of jib by means of a metallic plate 49a, 49b.
  • said fork 48a, 48b comprises a central reinforcement obtained by means of a metallic transom 50a, 50b welded in its upper part to the two branches of the fork 48a, 48b.
  • Said guides 32a, 32b have an end pivoted in 46a, 46b to said couple of brackets 40 and the opposite end free to oscillate, without however getting out from the trestle structure of the jib, between a position parallel to the corresponding fork 48a, 48b, and an oblique position substantially parallel to the direction of the corresponding hydraulic cylinder 31a, 31b.
  • the guides 32a, 32b comprise a couple of metallic bars 34a, 34b having a circular section and disposed parallel one to each other and maintained spaced by means of spacers 35a, 35b and 36a, 36b fixed to the ends of said guides 32a, 32b, in order to define a sliding channel 37a, 37b for the cursors 33a, 33b.
  • the spacers 36a, 36b are pivoted in 46a, 46b to the couple of plates 40 and the spacers 35a, 35b are preferably provided with a concave face facing the sliding channel 37a, 37b, in order to define a limit stop rabbet for the corresponding pin or cursor 33a, 33b.
  • said pins or cursors 33a, 33b can slide freely inside said guides 32a, 32b between a position in which they are in contact with the spacers 36a, 36b provided in correspondence with the couple of plates 40 and a position in which they are in contact with the spacers 35a, 35b provided in correspondence with the free end of said guides 32a, 32b.
  • said guides 32a, 32b shall rotate freely around the cursors 33a, 33b because of the oscillatory movement of the guides during the opening and the closing of the jib, favouring the relative position assumed by the sections of the jib in reciprocal rotation.
  • the hydraulic cylinder 31a provided between the proximal section 11 and the intermediate section 12, is pivoted to the couple of plates 40 in correspondence of slots 47 so shaped as to enable the free rotation of the intermediate section 12 relative to the proximal section 11 under the push of the couple of struts 61c, when the cable 60 is set in tension for raising the jib of the crane.
  • said slots will allow a free partial opening of the jib of approximately 15° sufficient to let the struts 61c to get out.
  • a roller or a sliding block, not illustrated, could be moreover provided on the free end of the struts 61c in order to avoid locks against the beam 16 of the distal portion 13 of the jib during the raising of the jib.
  • the forks 148a, 148b will be pivoted to a cursor 133a, 133b flowing into the channel 137a, 137b defined in said guides, and to the couple of brackets 40 provided in correspondence of the intermediate section 12.
  • Said guides 132a, 132b are moreover provided, on both the extremities, with spacers 135a, 135b and 136a, 136b in order to stop the sliding of the cursors 133a, 133b placed on the free extremities of the forks 148a, 148b.
  • the forks 148a, 148b will always be out of the trestle structure of the jib.
  • the safety mechanism 70 shown in the Figures 11a-11c comprises a circular sector 71, correspondent to around a quarter of a circle, welded along one of the spokes to the end of the hydraulic cylinder 31a, and a limit stop 72 welded between the couple of brackets 40.
  • slots 47 and the safety mechanism 71 are provided in correspondence with the pivoting point of the hydraulic cylinder 31a, it will also be possible that said slots and said mechanism be realised in correspondence with the pivoting point of the hydraulic cylinder 31b, provided between the distal section 13 and the intermediate section 12 of the jib.
  • the hydraulic cylinders 31a, 31b that control the opening and the closing of the jib are preferably powered by the same hydraulic circuit.
  • the extensible passive devices could be made of a plurality of small connecting rods pivoted together or made of other equivalent means what ropes or chains.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
EP98830667A 1998-11-05 1998-11-05 Flèche repliable pour grue à tour Withdrawn EP0999171A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98830667A EP0999171A1 (fr) 1998-11-05 1998-11-05 Flèche repliable pour grue à tour

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98830667A EP0999171A1 (fr) 1998-11-05 1998-11-05 Flèche repliable pour grue à tour

Publications (1)

Publication Number Publication Date
EP0999171A1 true EP0999171A1 (fr) 2000-05-10

Family

ID=8236870

Family Applications (1)

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EP98830667A Withdrawn EP0999171A1 (fr) 1998-11-05 1998-11-05 Flèche repliable pour grue à tour

Country Status (1)

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EP (1) EP0999171A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225152A1 (fr) * 2001-01-23 2002-07-24 San Marco International S.r.l. Grue à montage automatique avec une tour repliable et télescopique et à flèche repliable
CN102491187A (zh) * 2011-11-25 2012-06-13 湖南省电力公司超高压管理局 轻便自立钛合金液压吊装扒杆
CN114955894A (zh) * 2022-06-13 2022-08-30 中建三局集团有限公司 一种顶加节自升降式折叠塔机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2306158A1 (fr) * 1975-04-03 1976-10-29 Cadillon Roger Perfectionnements aux systemes de repliage des fleches distributrices de grues
FR2436097A1 (fr) * 1978-09-16 1980-04-11 Pingon Int Grue repliable perfectionnee, a montage rapide
IT1186207B (it) * 1985-11-19 1987-11-18 Benazzato Gru Spa Braccio pieghevole per gru con mezzi indipendenti per il riegamento ed il dispiegamento
GB2196605A (en) * 1986-10-27 1988-05-05 Potain Sa Foldable machine for handling and lifting loads
EP0536060A1 (fr) * 1991-10-02 1993-04-07 Potain Flèche à repliage automatisé pour grue
DE4314779A1 (de) * 1993-05-05 1994-11-10 Noell Serv & Maschtechn Gmbh Zusammenklappbarer Ausleger für einen Kran
EP0870726A1 (fr) * 1997-04-11 1998-10-14 Potain Grue à montage automatisé à flèche pliable, avec repliage latéral pour transport

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2306158A1 (fr) * 1975-04-03 1976-10-29 Cadillon Roger Perfectionnements aux systemes de repliage des fleches distributrices de grues
FR2436097A1 (fr) * 1978-09-16 1980-04-11 Pingon Int Grue repliable perfectionnee, a montage rapide
IT1186207B (it) * 1985-11-19 1987-11-18 Benazzato Gru Spa Braccio pieghevole per gru con mezzi indipendenti per il riegamento ed il dispiegamento
GB2196605A (en) * 1986-10-27 1988-05-05 Potain Sa Foldable machine for handling and lifting loads
EP0536060A1 (fr) * 1991-10-02 1993-04-07 Potain Flèche à repliage automatisé pour grue
DE4314779A1 (de) * 1993-05-05 1994-11-10 Noell Serv & Maschtechn Gmbh Zusammenklappbarer Ausleger für einen Kran
EP0870726A1 (fr) * 1997-04-11 1998-10-14 Potain Grue à montage automatisé à flèche pliable, avec repliage latéral pour transport

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225152A1 (fr) * 2001-01-23 2002-07-24 San Marco International S.r.l. Grue à montage automatique avec une tour repliable et télescopique et à flèche repliable
US6655539B2 (en) 2001-01-23 2003-12-02 San Marco International S.R.L. Tower crane with composite structure, self-assembling, with folding and telescoping tower, and arm made up of several sections
CN102491187A (zh) * 2011-11-25 2012-06-13 湖南省电力公司超高压管理局 轻便自立钛合金液压吊装扒杆
CN114955894A (zh) * 2022-06-13 2022-08-30 中建三局集团有限公司 一种顶加节自升降式折叠塔机
WO2023240979A1 (fr) * 2022-06-13 2023-12-21 中建三局集团有限公司 Grue à tour pliable à levage automatique permettant d'ajouter des sections au-dessus de celle-ci

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