EP1024106A1 - Method and device for mounting of the top of the tower of tower cranes - Google Patents

Abstract

Method involves assembly on ground of first section with counter broom (8), tie rods (19), rear part (22) of broom holder (5) and second section with broom (6), tie rods (13, 14) and front part (21) of broom holder. First section is raised onto center point or mast-cab along horizontal axis (18) while second section is raised along horizontal axis (77). Two sections are attached to each other with broaching axis (78, 79) at ends (28, 47). An Independent claim is also included for the description of the apparatus needed to assemble rotating section of tower crane.

Description

The present invention relates to a method and a device for mounting of the components of the rotating part of a tower crane, this invention focusing more particularly on the constitution and mounting the mast head of tower cranes.

Large capacity tower cranes, used on construction sites construction of buildings and public works, are generally "Rotating from the top", that is to say that they have a fixed mast, of height adjustable by means of additional mast elements, and a part rotating upper, orientable around a vertical axis, which includes a distributor arrow and a counter-arrow constituting counterweight support.

More particularly, the rotating part of such a crane comprises usually a rotating pivot, surmounted by a mast head also called "Arrow-holder", the arrow and the counter-arrow being located on either side of the masthead. The arrow is articulated, by its posterior end, to the face front of the arrowhead, and it is held substantially in position horizontal by means of one or more lines of arrow rods, connecting each obliquely the top of the arrowhead at a point on the arrow. Of analogously, the counter-jib is articulated, by its anterior end, to the rear face of the arrowhead, and it is held in position substantially horizontal by means of one or more lines of tie bars, each connecting obliquely the top of the arrowhead to a point on the counter-arrow.

European patent application EP 0 635 450 A1, in the name of Applicant describes a method for mounting the distributing boom and the jib of such a tower crane. According to this process, the elements of arrow are aligned and assembled on the ground with their tie rods, then we raise and aligns the tie rods, and possibly those of the jib, using an auxiliary assembly machine such as a mobile crane. Then, using the same machine, we lift the whole boom or counter-jib with the tie rods, and the jib or counterjib is presented opposite the masthead previously mounted, so that the free ends of the tie lines appear correctly at the top of the mast head, allowing a direct pinning of the tie rods at the top of the masthead.

• Dans une première phase, on assemble par brochage la contreflèche à la base de la tête de mât, précédemment montée, on lie l'extrémité du tirant de la contreflèche à une bretelle de montage fixée provisoirement sur la tête de mât, on relève la bretelle jusqu'à l'alignement du tirant par l'intermédiaire d'un câble de montage formant un mouflage entre cette bretelle et le sommet de la tête de mât précédemment montée, et on broche le tirant de la contreflèche au sommet de la tête de mât.
• Dans une deuxième phase, il est procédé de façon analogue pour le ou les tirants de la flèche, c'est-à-dire que l'on assemble par brochage la flèche à la base de la tête de mât, du côté opposé à la contreflèche, on lie l'extrémité libre du ou des tirants de flèche à une bretelle de montage, fixée provisoirement sur la tête de mât, on relève cette bretelle jusqu'à l'alignement du tirant, ou des tirants reliés les uns aux autres, par l'intermédiaire du câble de montage précité formant un autre mouflage entre ladite bretelle et le sommet de la tête de mât précédemment montée, et on broche le ou les tirants de la flèche au sommet de la tête de mât.

We also know, from European patent application EP 0 846 650 A1 in the name of the Applicant, a method for mounting the tie rods of tower cranes of the kind here concerned, according to which:

• In a first phase, the brace is assembled by broaching at the base of the masthead, previously mounted, the end of the brace tie rod is connected to a mounting strap temporarily fixed on the mast head, the strap is raised up to the alignment of the tie rod by means of a mounting cable forming a haulage between this strap and the top of the masthead previously mounted, and the tie rod of the counterjib is pinned to the top of the mast head .
• In a second phase, the procedure is similar for the tie rod (s), that is to say that the arrow is assembled by pinning at the base of the mast head, on the side opposite to the counter-jib, the free end of the jib tie rod (s) is linked to a mounting strap, provisionally fixed to the mast head, this strap is raised until the tie rod or the tie rods are connected to each other, by means of the abovementioned mounting cable forming another haulage between said strap and the top of the previously mounted mast head, and the arrow rod (s) are pinned to the top of the mast head.

This process is also implemented by aligning and assembling the boom elements on the ground, and using an auxiliary machine lifting to present the jib, then the jib, facing the masthead previously assembled.

This solution is more advantageous than that of the request for European patent EP 0 636 450 A1, in particular for tower cranes large capacity whose arrows are provided with several tie rods. However, it still retains certain drawbacks.

In particular, the process of document EP 0 846 650 A1 requires have a special motorization, with auxiliary winch and hauling or with stiffener and hauling, to align and pin the tie rods of the arrow and counter-arrow, hence a certain constructive complication for the device for implementing the method.

The hauling, necessary for alignment and broaching tie rods and arrow, also takes time. This process also immobilizes the device for a relatively long period lifting aid, which must be used not only for operations main handling, but also during intermediate operations what are the lifting of the tie rods of the contra-arrow and the tie-rods of the arrow to using the above-mentioned hauling. Finally, the process considered requires the execution “In the air” of several manual stitching assembly operations, with a certain risk for the interveners who have to travel on crane parts temporarily held by the auxiliary lifting device.

Furthermore, this kind of process involves an implementation in three "Package" of the rotating part of the crane, namely the "boom" assembly, the “counter-arrow” assembly, and the “arrow-holder with hauling” assembly. This requires a large volume for the storage and transport of the constituents of the rotating part, and also implies that the auxiliary lifting device must successively assemble the three "packages".

• de réduire le volume nécessaire pour le stockage et le transport des constituants de la partie tournante, en recherchant la possibilité d'imbriquer les éléments ;
• de réduire le nombre de pièces et parties annexes, spécifiques aux opérations de montage de la grue, en particulier par suppression du mouflage et de sa motorisation, dédiés précédemment à ces opérations ;
• de simplifier et limiter les opérations d'assemblage « en l'air » des éléments constitutifs de la partie tournante, et de rendre ces opérations plus sûres pour les intervenants, en réduisant le nombre des manutentions et des opérations d'assemblage « en l'air » notamment en réduisant le nombre de colis principaux ;
• de réduire le temps d'utilisation de l'engin auxiliaire de montage, tel que grue mobile.

The present invention aims to avoid these drawbacks, and it therefore aims to provide a method and a device for mounting the constituent elements of the rotating part of a tower crane, of the type concerned, which allow both:

• to reduce the volume necessary for the storage and transport of the components of the rotating part, by seeking the possibility of nesting the elements;
• reduce the number of parts and ancillary parts, specific to the crane assembly operations, in particular by removing the hauling system and its motorization, previously dedicated to these operations;
• to simplify and limit the assembly operations “in the air” of the constituent elements of the rotating part, and to make these operations safer for those involved, by reducing the number of handling operations and assembly operations “in the air ”notably by reducing the number of main packages;
• to reduce the time of use of the auxiliary assembly machine, such as a mobile crane.

• à assembler au sol un ensemble formé par la contreflèche, son ou ses tirants et une partie arrière du porte-flèche réalisé en deux parties séparables, à savoir une partie avant et la partie arrière, et à assembler aussi au sol un autre ensemble formé par la flèche, son ou ses tirants et la partie avant du porte-flèche ;
• à l'aide d'un engin de manutention ou de levage, à lever l'ensemble prémonté formé par la contreflèche, son ou ses tirants et la partie arrière du porte-flèche, et à assembler par brochage cet ensemble, suivant un axe horizontal, sur le pivot tournant ou sur un élément de mât ou mât-cabine lié à ce pivot tournant ;
• à l'aide de l'engin de manutention ou de levage, à lever l'ensemble prémonté formé par la flèche, son ou ses tirants et la partie avant du porte-flèche, et à assembler par brochage cet ensemble, suivant un axe horizontal, sur le pivot tournant ou le mât-cabine ;
• à lier entre eux par au moins un axe de brochage les sommets respectifs des parties avant et arrière du porte-flèche.

To this end, the method according to the invention essentially consists, for a tower crane whose rotating part comprises a mast head or boom holder, a distributing boom articulated by its end posterior to the front face of the boom holder and connected at the top of the jib holder by one or more tie rods, and a jib articulated by its front end to the rear face of the jib holder and connected to the top of the jib holder by one or more tie rods:

• to assemble on the ground an assembly formed by the jib, its tie rod (s) and a rear part of the jib holder made in two separable parts, namely a front part and the rear part, and to also assemble on the ground another assembly formed by the arrow, its tie rod (s) and the front part of the arrow holder;
• using a handling or lifting machine, to lift the pre-assembled assembly formed by the jib, its tie rod (s) and the rear part of the jib holder, and to assemble this assembly by pinning, along a horizontal axis , on the rotary pivot or on a mast or mast-cabin element linked to this rotary pivot;
• using the handling or lifting device, to lift the pre-assembled assembly formed by the arrow, its tie rod (s) and the front part of the jib holder, and to assemble this assembly, along a horizontal axis , on the turning pivot or the mast-cabin;
• to link together by at least one broaching axis the respective tops of the front and rear parts of the jib holder.

Thus, the invention is essentially based on the initial separation of the two-part arrowhead, respectively a front part and a part rear, which allows two separate assemblies to be pre-assembled on the ground, one comprising the jib and the rear part of the jib holder, and the other the arrow and the front part of the arrow holder. These two pre-assembled assemblies are then successively lifted and assembled to the turning pivot or to the top of the mast-cabin by pinout. The two constituent parts of the arrowhead are also linked together by broaching, in their upper portions, of so as to ultimately constitute a complete, rigid, looking arrowhead triangular or polygonal (seen from the side).

Advantageously, the assembly on the ground of the assembly formed by the arrow, its tie (s) and the front part of the arrow holder is made by tying articulated the base of the front part of the arrowhead at the end posterior of the boom foot, and also linking the front part of the boom holder at the jib foot by a means limiting pivoting, forward and toward the rear of the front part of the arrowhead relative to the arrow. The angular travel thus authorized, for example of the order of 5 °, facilitates the final operation of connecting the tops of the front and rear parts of the arrowhead.

In a particular embodiment, the assembly operation on the ground of the assembly formed by the arrow, its tie rod (s) and the front part of the arrow holder also includes, for the or each drawing of the arrow, the fixing of a rear part of the tie rod at the top of the front part of the jib holder, the fixing of a front part of the same tie at an intermediate point of the arrow, bringing the rear and front parts of the tie together using a sling pulled by an auxiliary handling or lifting device, and the pinout of the front end of the rear part of the tie rod on the rear end of the front part of the tie rod. The tie rods are thus pinned together, by ground operations, and they find themselves in an aligned position.

The lifting operation of the assembly formed by the jib, its or its tie rods and the rear part of the arrow holder is achievable, according to a first method of implementation, using slings comprising front slings attached to the base of the rear part of the arrowhead, and passing over a deflection member carried by this rear part, and rear slings attached to the structure of the jib, so as to maintain the structure of the substantially horizontal jib during the lifting of this assembly and its pinout on the turning pivot or the mast-cabin, the tie rods of the jib being aligned and tensioned.

In another embodiment, constituting a variant of the previous, the lifting operation of the assembly formed by the jib, its or its tie rods and the rear part of the arrow holder is made using slings comprising front slings attached to the base of the rear part of the arrowhead, but not deflected, and rear slings attached to the strut structure, the slings being long adapted to maintain the structure of the jib in an inclined position by with respect to the horizontal, during the lifting of this assembly and its pinout on the turning pivot or the mast-cabin, the rear part of the boom holder being pivoted back and in abutment, so that the tie rod (s) remain relaxed; the structure of the jib is brought back to the horizontal, and the or the tie rods are tensioned, after pinning of said assembly on the pivot rotating or mast-cabin.

Since the assembly is first carried out including the jib and the rear part of the jib holder, then mounting of the assembly comprising the arrow and the front part of the arrow holder, the process still advantageously comprises, after the broaching operation of the first of these sets on the turning pivot or the mast-cabin, the realization of a provisional connection with clearance maintaining the rear part of the arrow holder in upright position, waiting for the pinout of the top of the front part of the arrowhead on the top of said rear part. This temporary connection with play, not intervening during the work of the crane, is achievable by means of retaining rods and lights, connecting the top of the rear part of the arrow holder with swivel pivot or cabin mast.

The lifting operation of the assembly formed by the boom, its or its tie rods and the front part of the jib holder, is also carried out using slings preferably by keeping the arrow substantially horizontal until its broaching on the swivel pivot or the mast-cabin, then by rotating the boom slightly upwards around the axis making this pinout, to make a approach pinout with clearance between the top of the front part and the top of the rear part of the arrowhead. Then there is a pivot reverse of the arrow driving forward the rear part of the arrow holder, and carrying out a final pinout. More particularly, the pivoting reverse of the arrow, driving forward thanks to its dead weight more import the rear part of the arrow holder, move the broaching hole definitive of the summit of said rear part following an arc of a circle, the center corresponds to the broaching axis of the jib and the rear part of the boom holder on the turning pivot or the mast-cabin. During the same time, the final broaching hole at the top of the front part of the arrowhead is moves along another arc, the center of which corresponds to the axis of pin assignment of the arrow and the front part of the arrow holder on the turning pivot or the mast-cabin. By these movements, the final pin holes respective vertices of the two parts of the arrowhead are sure to find a common axis, at the point of intersection of the two arcs of circle mentioned, whatever the starting geometrical position of these broaching holes, and thus the realization of the final pinout is always possible. As we includes, this final pinout ensures the stiffening of the arrow holder, necessary for it to perform its function when working the crane.

- une partie avant de porte-flèche, comportant des montants liés rigidement entre eux et pourvus à leurs extrémités inférieures de tenons ou chapes, coopérant avec des chapes ou tenons prévus à l'extrémité postérieure du pied de flèche, ainsi qu'avec des chapes ou tenons prévus sur le pivot tournant ou le mât-cabine,

- une partie arrière de porte-flèche, séparable de la partie avant et comportant des montants liés rigidement entre eux et pourvus à leurs extrémités inférieures de tenons ou chapes, coopérant avec des chapes ou tenons prévus à l'extrémité antérieure de la structure de la contreflèche, ainsi qu'avec des chapes ou tenons prévus sur le pivot tournant ou le mât-cabine,

- les parties avant et arrière du porte-flèche étant encore pourvues, à leurs sommets respectifs, d'organes complémentaires tels que tenon et chape, pour la liaison par brochage entre ces deux parties.

For the implementation of the previously defined mounting method, the invention also relates to a device which essentially comprises, in combination:

- A front part of arrow holder, comprising uprights rigidly connected to each other and provided at their lower ends with tenons or clevis, cooperating with clevis or tenons provided at the rear end of the arrow base, as well as with clevis or pins provided on the turning pivot or the mast-cabin,

- a rear part of the jib holder, separable from the front part and comprising uprights rigidly connected together and provided at their lower ends with tenons or clevis, cooperating with clevis or tenon provided at the anterior end of the structure of the counter-jib, as well as with clevis or tenons provided on the swivel pivot or the mast-cabin,

- The front and rear parts of the jib holder being further provided, at their respective vertices, with complementary members such as tenon and clevis, for the pin connection between these two parts.

According to one embodiment of this device, the front part of the arrow holder is connected, via a crutch made up of two sections uneven articulated between them, at the rear part of the boom foot, one of the sections of the stand comprising a support member on the mast foot, so as to limit the pivoting, forward and backward, of the front part of the arrowhead relative to the arrow.

According to another advantageous arrangement, the post and the clevis complementary, provided at the tops of the front and rear parts of the jib holder, have corresponding front and rear holes, respectively for carrying out an approach pinout with clearance, and a final broaching, between the tenon and the clevis.

• Il n'est plus nécessaire de prévoir une motorisation (avec son alimentation en énergie) et un mouflage, pour effectuer l'alignement et le brochage des tirants de la flèche et éventuellement de la contreflèche, d'où simplification et économie.
• Par la suppression de la réalisation d'un mouflage pour l'alignement et le brochage des tirants de flèche, l'invention procure aussi un gain de temps dans les opérations de prémontage et de montage.
• La plupart des opérations de prémontage, concernant notamment l'ensemble formé par la flèche, son ou ses tirants et la partie avant du porte-flèche, et l'ensemble formé par la contreflèche, son ou ses tirants et la partie arrière du porte-flèche, sont réalisées au niveau du sol, donc en toute sécurité, à l'aide d'un engin de manutention de faible capacité.
• Seuls deux « colis », à savoir d'une part l'ensemble formé par la flèche, son ou ses tirants et la partie avant du porte-flèche, et d'autre part l'ensemble formé par la contreflèche, son ou ses tirants et la partie arrière du porte-flèche, doivent être successivement manutentionnés par un engin de levage de forte capacité (au lieu de trois « colis » dans les solutions antérieures).
• Les opérations de manutention de ces deux ensembles, à l'aide de l'engin de levage de forte capacité, sont effectuées directement l'une à la suite de l'autre, sans qu'il soit nécessaire de réaliser, entre ces opérations, d'autres opérations intermédiaires telles que relevage des tirants de flèche et de contreflèche ; le temps d'immobilisation de l'engin de levage de forte capacité est donc minimisé.
• Toutes les opérations de brochage, qui restent à exécuter « en l'air », s'effectuent à l'aplomb du mât de la grue, donc sans risque pour les intervenants qui, en particulier, n'ont pas à se déplacer en hauteur sur des parties de grue maintenues seulement par l'engin de levage.
• Etant réalisé en deux parties séparables, chacune de forme sensiblement plane, le porte-flèche offre un encombrement minimal, pour le transport et le stockage.
• Cette structure en deux parties du porte-flèche en facilite aussi la fabrication, en évitant tout assemblage mécanosoudé en volume, chaque partie étant un simple treillis plan, avec deux montants réunis par des traverses.
• La liaison entre l'extrémité postérieure de la flèche, la base de la partie avant du porte-flèche et le sommet du mât-cabine s'effectue en un seul point, plus particulièrement suivant le même axe de brochage, permettant ainsi une triangulation simple et évitant, de ce fait, tous les moments (couples) internes de flexion.
• De même, la liaison entre l'extrémité antérieure de la contreflèche, la base de la partie arrière du porte-flèche et le sommet du mât-cabine s'effectue en un seul point, plus particulièrement suivant le même axe de brochage, permettant ainsi une triangulation simple et évitant de ce fait tous les moments (couples) internes de flexion.

Overall, the method and the device for mounting the mast head of tower cranes, objects of the invention, have the following advantages, compared with the prior art:

• It is no longer necessary to provide a motorization (with its energy supply) and a hauling system, to carry out the alignment and the broaching of the jib tie rods and possibly of the jib, hence simplification and economy.
• By eliminating the need for hauling for the alignment and broaching of the tie rods, the invention also saves time in the pre-assembly and assembly operations.
• Most of the pre-assembly operations, concerning in particular the assembly formed by the jib, its or its tie rods and the front part of the jib holder, and the assembly formed by the jib, its or its tie rods and the rear part of the holder boom, are made at ground level, therefore safely, using a low-capacity handling machine.
• Only two "packages", namely on the one hand the assembly formed by the arrow, its or its tie rods and the front part of the jib holder, and on the other hand the assembly formed by the jib, its or its tie rods and the rear part of the jib holder, must be successively handled by a heavy lifting device (instead of three "packages" in the previous solutions).
• The handling operations of these two sets, using the high capacity lifting device, are carried out directly one after the other, without it being necessary to carry out, between these operations, other intermediate operations such as raising the jib and counter-jib tie rods; the downtime of the high capacity lifting device is therefore minimized.
• All pinout operations, which remain to be carried out "in the air", are carried out directly above the crane mast, therefore without risk for operators who, in particular, do not have to travel high on crane parts held only by the hoist.
• Being made of two separable parts, each of substantially planar shape, the arrowhead offers minimal space, for transport and storage.
• This structure in two parts of the jib holder also facilitates its manufacture, avoiding any mechanically welded assembly in volume, each part being a simple plane trellis, with two uprights joined by crosspieces.
• The connection between the rear end of the boom, the base of the front part of the boom holder and the top of the mast-cabin takes place at a single point, more particularly along the same pinout axis, thus allowing simple triangulation. and thereby avoiding all internal bending moments (couples).
• Likewise, the connection between the anterior end of the jib, the base of the rear part of the jib holder and the top of the cabin mast is made at a single point, more particularly along the same broaching axis, thus allowing a simple triangulation and thereby avoiding all internal bending moments (couples).

Figure 1 est une vue d'ensemble de côté, à l'état monté, d'une grue à tour à laquelle s'applique le procédé de la présente invention ;

Figure 2 est une vue en perspective éclatée de la tête de mât et des parties adjacentes, notamment de la flèche et de la contreflèche ;

Figure 3 est une vue de détail , de côté, de la partie arrière du pied de flèche et d'une portion inférieure de la partie avant du porte-flèche ;

Figure 4 est une vue de détail, de côté, de l'extrémité avant de la contreflèche et d'une portion inférieure de la partie arrière du porte-flèche ;

Figure 5 est une vue de détail, de côté, des portions supérieures des parties avant et arrière du porte-flèche, réunies entre elles ;

Figure 6 représente, en vue de côté, l'ensemble formé par la flèche et ses tirants (représentés partiellement) et par la partie avant du porte-flèche, en phase initiale d'assemblage au sol ;

Figures 7 et 8 sont des vues de côté similaires à figure 6, illustrant deux phases ultérieures de l'assemblage au sol dudit ensemble ;

Figure 9 est une vue de côté illustrant dans son principe le montage, sur le mât-cabine, de l'ensemble formé par la contreflèche, ses tirants et la partie arrière du porte-flèche ;

Figure 10 représente plus en détail l'opération de la figure 9, particulièrement sous l'aspect manutention dudit ensemble, dans un premier mode de mise en oeuvre ;

Figure 11 est une vue similaire à figure 10, illustrant un deuxième mode de mise en oeuvre de la manutention dudit ensemble ;

Figures 12, 13 et 14 illustrent les phases successives d'un troisième mode de mise en oeuvre de l'assemblage et de la manutention de cet ensemble ;

Figure 15 est une vue de côté illustrant la première phase du montage, sur le mât-cabine, de l'ensemble formé par la flèche, ses tirants et la partie avant du porte-flèche ;

Figures 16 et 17 sont des vues de côté similaires à la figure 15, illustrant deux phases ultérieures du montage dudit ensemble sur le mât-cabine ;

Figure 18 est une vue similaire aux précédentes, montrant la phase finale de montage de la partie tournante de la grue ;

Figure 19 est une vue de côté illustrant une phase de montage, dans une variante de l'invention ;

Figure 20 est une vue en perspective éclatée de la région du sommet du porte-flèche, relative à cette variante ;

Figures 21 et 22 sont des vues de côté similaires à figure 19, illustrant des phases ultérieures du montage pour la même variante.

The invention will in any case be better understood with the aid of the description which follows, with reference to the appended schematic drawing which, by way of example, illustrates modes of implementation of this method for mounting the head. tower crane mast, and represents embodiments of the device for implementing this method:

Figure 1 is an overall side view, in the assembled state, of a tower crane to which the method of the present invention applies;

Figure 2 is an exploded perspective view of the masthead and adjacent parts, in particular of the jib and the jib;

Figure 3 is a detail view, from the side, of the rear part of the jib foot and of a lower portion of the front part of the jib holder;

Figure 4 is a detail view, from the side, of the front end of the jib and of a lower portion of the rear part of the jib holder;

Figure 5 is a detail view, from the side, of the upper portions of the front and rear parts of the arrowhead, joined together;

Figure 6 shows, in side view, the assembly formed by the boom and its tie rods (partially shown) and by the front part of the boom holder, in the initial assembly phase on the ground;

Figures 7 and 8 are side views similar to Figure 6, illustrating two subsequent phases of the assembly on the ground of said assembly;

Figure 9 is a side view illustrating in principle the mounting, on the mast-cabin, of the assembly formed by the jib, its tie rods and the rear part of the jib holder;

Figure 10 shows in more detail the operation of Figure 9, particularly in the handling aspect of said assembly, in a first embodiment;

Figure 11 is a view similar to Figure 10, illustrating a second embodiment of the handling of said assembly;

Figures 12, 13 and 14 illustrate the successive phases of a third embodiment of the assembly and handling of this assembly;

Figure 15 is a side view illustrating the first phase of assembly, on the mast-cabin, of the assembly formed by the boom, its tie rods and the front part of the boom holder;

Figures 16 and 17 are side views similar to Figure 15, illustrating two subsequent phases of mounting said assembly on the mast-cabin;

Figure 18 is a view similar to the previous ones, showing the final assembly phase of the rotating part of the crane;

Figure 19 is a side view illustrating an assembly phase, in a variant of the invention;

Figure 20 is an exploded perspective view of the top region of the arrowhead, relating to this variant;

Figures 21 and 22 are side views similar to Figure 19, illustrating subsequent stages of assembly for the same variant.

Some figures have enlarged details, designated by letters A, B, C, etc ...

The tower crane shown in FIG. 1 comprises, in a known manner, a fixed or rolling base frame 1, a mast 2 of adjustable height surmounted a fixed pivot 3 and a rotating part 4, orientable around a vertical axis, which itself includes a masthead or “arrowhead” 5, an arrow distributor 6 along which a carriage 7 moves, and a jib 8 carrying a counterweight 9. In the example considered, the arrow holder 5 overcomes a short section of mast 10, called “cabin mast”, also belonging to the part 4 and on which the driver's cabin 11 of the crane.

In a manner also known per se, the arrow 6 consists of several aligned elements, with lattice structure, including a first element 12 says "arrow foot", articulated by its end posterior to the base of the arrowhead 5 and on the mast-cabin 10, around a horizontal axis. Arrow 6 is held in a substantially horizontal position by two oblique tie rods 13 and 14, both linked to the top 15 of the arrowhead 5, and also linked, respectively, at two intermediate points 16 and 17 (spaced from each other) arrow 6. The tie rods 13 and 14 are themselves formed, each, by several successive elements articulated together, and can thus be also referred to as "tie lines".

The counter-jib 8 is located, with respect to the mast head 5, on the opposite side in arrow 6, the anterior end of the jib 8 being articulated, around a horizontal axis 18, at the base of the jib holder 5 and on the mast-cabin 10. This jib 8 is kept here in a substantially horizontal position by a double oblique tie 19, which connects two symmetrical points 20 of the part posterior of the structure of the jib 8 to the top 15 of the jib holder 5. Like the jib tie rods 13 and 14, the jib tie rods 19 are composed of several successive elements, articulated between them. The contreflèche 8 also has a trellis structure (see Figure 2).

The arrow holder 5 consists of two removable and separable parts from each other, namely a front part 21 and a rear part 22, shown separate from each other in Figure 2. In the mounted position, the front 21 and rear 22 converge at the top 15 of the jib holder 5.

The front part 21 of the arrow holder 5 is associated with arrow 6 and, more in particular, at the foot of the arrow 12. This front part 21 comprises two converging uprights 23, joined to each other at their top, and connected between them, respectively, at their base and at an intermediate height, by two horizontal crosspieces 24 and 25. The lower ends of the two uprights 23 have respective pins 26, each pierced with a broaching hole 27. The close upper ends of the two uprights 23 are assembled to another tenon 28, pierced with two holes 29 and 30, one anterior and the other posterior.

The rear end of the jib foot 12 comprises, on each side, a yoke 31 with opening directed downwards, receiving one of the tenons lower 26 of the front part 21 of the arrowhead 5. A boss 32 on each of these pins 26, and a safety pin 33 (see detail in Figure 3), prohibit uncoupling between each yoke 31 and the corresponding pin 26.

Referring again to Figures 2 and 3, the front part 21 of the arrow holder 5 is also connected to the jib base 12 by means of a crutch 34, consisting of two unequal sections 35 and 36, hinged together around an intermediate axis 37. The first section 35, of greater length, is articulated at one end to a yoke 38 linked to the crosspiece 25 of the part front 21 of the arrow holder 5; it has, at its opposite end, a plate support 39 intended to rest on the upper chord 40 of the jib foot 12. The second section 36, of shorter length, is articulated around an axis 41 at the rear end of the upper chord 40 of the jib foot 12. In FIG. 3, the stand 34 is shown in the folded position, position in which it limits the forward pivoting of the front part 21 of the arrow holder 5. In the unfolded position, the same stand 34 limits pivoting towards the rear of the front part 21 of the arrowhead 5. The angle between the two limit positions of this front part 21 of the arrow holder 5 is of the order of 5 °.

The rear part 22 of the jib holder 5 is associated with the jib 8. This rear part 22 includes two converging main uprights 42, joined to each other at their apex, and connected to each other, respectively to their base and at an intermediate height, by two horizontal crosspieces 43 and 44. The lower ends of the two uprights 42 have tenons respective 45, each pierced with an opening 46. The upper ends close to the two uprights 42 are assembled to a yoke 47, of which each branch has two holes, one anterior and the other posterior. The rear part 22 of the boom holder 5 further comprises two retaining rods 48, articulated by their upper ends under the yoke 47. The end lower of each connecting rod 48 carries a yoke 49.

The anterior end of the jib 8 has, on each side, a clevis 50 with opening directed downwards, receiving one of the tenons lower 45 of the rear part 22 of the arrowhead 5. A boss 51 on each of these tenons 45, and a safety axis 52, prohibit the uncoupling between each clevis 50 and the corresponding tenon 45 - see Figures 2 and 4.

In a particular embodiment (see Figure 10), the part rear 22 of the arrowhead 5 has a strap 53 articulated on the uprights main 42, and designed to offset the attachment point of the slings handling, as detailed below.

Optionally, the rear part 22 of the arrow holder 5 comprises at least a connecting bar 81, articulated on the crosspiece 44. This bar is fixed on the front part 21 of the jib holder, once the crane is fully assembled, and serves triangulation bar reinforcing the connection between the front parts 21 and rear 22 of the boom holder 5.

Referring again to FIG. 2, the mast-cabin 10 comprises, at its top, two yokes 54 located respectively on both sides of the mast-cabin and facing forward, two other yokes 55 located respectively on both sides of the mast and rearward, and two legs 56 located respectively on both sides of the cabin mast and facing upwards. The two front yokes 54 of the mast-cabin 10 are provided to receive the lower pins 26 of the front part 21 of the arrowhead 5, as well as the posterior yokes 31 of the jib foot 12. The two rear yokes 55 of the mast-cabin 10 are provided to receive the lower lugs 45 of the part rear 22 of the arrowhead 5, as well as the front yokes 50 of the counterjib 8. Finally, the two legs 56 of the mast-cabin 10, each pierced of a light, are provided to receive the lower yokes 49 of the connecting rods retainer 48 of the rear part 22 of the jib holder 5.

It will also be noted that in the definitively assembled state, the upper yoke 47 of the rear part 22 of the arrowhead 5 receives the upper lug 28 of the front part 21 of the same arrowhead, the nesting of these two elements being illustrated by FIG. 5 which represents the region of the vertex 15 of the head of mast.

We will now describe the procedure followed for mounting the tower crane.

A first phase consists in assembling, on the ground, elements of the jib 8 and associated parts, using a handling machine low capacity (maximum load for example less than or equal to 4 tonnes). The elements of the double tie 19 of the jib 8 are then put in place, as well as the rear part 22 of the arrow holder 5, so as to constitute a triangular-looking structure, formed of the counter-jib 8, of the double tie 19 and said rear part 22.

A second phase consists in assembling, on the ground, elements of arrow 6 and associated parts, still using a handling machine low capacity. The successive elements of arrow 6 are aligned and assembled together and the carriage 7 is also put in place. The front part 21 of the boom holder is brought, its stand 34 being folded and resting, by its support plate 39, on the upper chord 40 of the jib foot 12 - see figure 6. The two lines of tie rods 13 and 14 of arrow 8 are also installed: the rear parts 13a or 14a of these tie rods 13 and 14 are joined by a double connecting rod 82, which hangs on a boss 83 formed around the hole anterior 29 of the pin 28 located at the top of the front part 21 of the arrow holder (see Figure 5), the double rod 82 being held in the hooked position by a clamping member. The front part 13b or 14b of each tie 13 or 14, still separated from the rear part, is linked to point 16 or 17 to the frame upper 40 of arrow 6. As shown in the enlarged details A and B of Figure 6, for the tie rod 14 of greater length, the front end of the rear part 14a has a yoke 57, and the rear end of the part before 14b of this tie rod has a lug 58 preferably with light or vice versa. There is also a roller 59 mounted at the front end of the rear part 14a of the line of tie rods 14, this roller 59 being able to roll on the upper chord 40.

To bring the two parts of each tie 13 or 14 closer to the arrow 6, a sling 60 is used passing over two movable pulleys 61, and on the hook 62 of the aforementioned handling device - see detail C in FIG. 6.

By means of the sling 60, the approximation of the two parts 14a and 14b of the line of upper tie rods 14, of greater length, and these parts are stitched together by an axis connecting the yoke 57 with the pin 58, the light of which leaves a play - see Figure 7.

Using the same sling 60, and the same movable pulleys 61, it then the two parts 13a and 13b of the line are brought together lower tie rods 13, of shorter length, these two parts also being finally stitched together - see Figure 8.

All the operations described so far are carried out on the ground.

The next phase consists, by means of a heavy lifting machine capacity (maximum load for example equal to or greater than 10 tonnes), and using adapted slings, to carry out handling of the assembly formed by the jib 8, by the double tie 19 and by the rear part 22 of the jib holder 5, to lift this assembly and bring it to the mast-cabin 10, as illustrated generally in Figure 9.

One then carries out, along the horizontal axis 18, a broaching binding the end front of the jib 8 and the base of the rear part 22 of the jib holder 5 with the mast-cabin 10. As shown in detail D in FIG. 9, it is also broaching, by an axis 63, of the yokes 49 situated at the ends lower of the two retaining rods 48 of the rear part 22 of the jib holder 5 on the corresponding legs 56 of the upper part of the mast-cabin 10. This link comprising a vertical clearance, thanks to the light 64 formed in each leg 56, the assembly thus put in place is finally released backwards by pivoting around axis 18, using the lifting used, until abutment pin 63 comes into abutment at a light end 64.

This phase is achievable, in a first mode of implementation illustrated by FIG. 10, using a set of particular slings, composed of two front slings 65 and two rear slings 66, of predefined length, suspended from the same hook 67 of the lifting gear. The two front slings 65 are attached at a point 68, at the base of the rear part 22 of the arrowhead 5, and they pass over the deployed strap 53, so as to be deflected on the end 69 of this strap 53 which constitutes thus a deported attachment point. The two rear slings 66 are attached at symmetrical points 70, situated towards the rear of the structure of the counter-arrow 8. When lifting the assembly, the double tie rod 19 of the counterjib 8 is aligned and taut, and the structure of jib 8 remains in substantially horizontal position, position which is maintained during pinning operations (previously described) of this assembly on the mast-cabin 10.

According to a second embodiment, illustrated in FIG. 11, the handling of the assembly in question is carried out using another assembly special slings, still composed of two front slings 71 and two rear slings 72, of predefined length. The two front slings 71 are attached to point 68, at the base of the rear part 22 of the arrowhead 5, and do not undergo here no deviation between the hook 67 and the attachment point 68. The two rear slings 72 are attached to the points 70, located towards the rear of the structure of the jib 8. When lifting the assembly, the two slings front 71 keep the rear part 22 of the jib holder 5 pivoted towards the rear relative to the structure of the jib 8, in the stop position against the yoke 50 by the axis 52, so that the elements 73, 74 and 75 of the line of tie rods 19 form a broken line. The structure of the jib 8 is handled by forming, with respect to the horizontal, an angle a sufficient important, for example equal to or greater than 15 °. This tilt of the counter-arrow 8 is retained during the operations (previously described) of pinout of the assembly on the mast-cabin 10. Once this pinout has been carried out, the counterjib 8 is pivoted about its pin 18 of broaching on the mast-cabin 10, until they come into a substantially horizontal position, the elements 73, 74 and 75 of the double tie 19 then being aligned and tensioned.

FIGS. 12 to 14 illustrate a third embodiment, concerning the assembly and handling of the assembly formed by the jib 8, the tie rod (s) 19 and the rear part 22 of the jib holder 1.

FIG. 12 illustrates the pinning operation of the tie rods 19, carried out at ground. For this operation, the rear part 22 of the arrow holder 5 is brought into place in its articulation at the front of the structure of the jib 8, and maintained in a substantially vertical position (for example with a slight tilt backwards, the angle β being approximately 87 °), using the low capacity handling. It is then proceeded to the pinout of the or each line of tie rods 19.

Then, as shown in figure 13, it is proceeded, using the same handling equipment, when tilting the rear part 22 of the arrowhead 5, to a forward tilted position (the angle γ being equal for example at around 9 °). In its tilting, the rear part 22 of the arrow holder 5 drives with it the tie rods 19, which are thus put in "pre-tension". This tilting position of the rear part 22 of the jib holder 5 is held by a rear stop, placed at the level of the joint, to maintain the pre-tension of the tie rod (s) 19 - see detail K in Figure 13.

Then, using the heavy lifting equipment, and slings front 71 and rear 72 of current length, including attachment points respectively 68 and 70 are located on the structure of the jib 8, it is proceeded to lift the assembly, as shown in Figure 14. The weight distribution then leads to an angle of inclination α of the order of 6 °, for the counter-jib 8, relative to the horizontal (the rear part 22 of the arrow holder 5 tilting forwards by an equal angle δ at around 15 °).

Like the previous one, this last mode of implementation makes useless any deflection member for slings 71 and 72. In addition, the angle inclination of the counter-jib, of the order of 6 °, is safer here that the angle of 15 ° or more reached in the previous setting mode artwork. This angle has smaller avoids introducing horizontal forces on the masthead and on the mast 2, during the disassembly of the jib 8.

Then, the assembly constituted by the arrow 6, by the tie rods 13 and 14 and by the front part 21 of the jib holder 5 is handled, using a high capacity lifting device, this assembly being lifted and brought to the mast-cabin 10, as an extension of the assembly with counter-jib 8 previously mounted. This is illustrated in Figure 15, in which the slings used with the hoist are indicated in 76. During the operation, as shown in detail E in FIG. 12, the stand 34 remains folded up. The two tie rods 13 and 14 remain relaxed.

There is then a pinout, along a horizontal axis 77, to link the rear end of the jib foot 12 and the base of the front part 21 from the boom holder 5 to the cabin mast 10.

Using the lifting device, the arrow 6 is then slightly pivoted upwards around its broaching axis 77 with the mast-cabin 10 (position visible in FIG. 15), the front part 21 of the jib holder 5 then performing a corresponding pivoting backwards. The upper tenon 28 of the part front 21 of the arrowhead 5 thus engages in the upper yoke 47 of the rear part 22 of this arrowhead 5. As shown in detail F in the figure 15, an approach pinning is then carried out, with play, between the stud 28 and the yoke 47, by means of an axis 78 which crosses the rear hole 30 of the tenon and the corresponding holes of the yoke 47, the diameter of the hole 30 being greater than that of axis 78.

In the next phase, illustrated by FIG. 16, the arrow 6 is lowered and brought back substantially to the horizontal, by reverse pivoting around its broaching axis 77 with the mast-cabin 10, using the lifting. The rear part 22 of the arrow holder 5 is driven forward, by the approach pinout previously made, the top of this rear part 22 describing an arc centered on the axis 18, while the apex of the front part 21 of the arrowhead 5 moves in an arc centered on axis 77, the movement continuing until alignment of the anterior hole 29 of stud 28 with the corresponding holes in clevis 47, at point of intersection of the two above-mentioned arcs. Simultaneously, tie rods 13 and 14 of arrow 6 line up and stretch, while the stand 34 unfolds (see detail H in Figure 16).

It is then proceeded to the final broaching linking the tops of the parts front 21 and rear 22 of the arrowhead 5 between them, as well as the double connecting rod 82 connecting tie rods 13 and 14, by introducing an axis 79 through the hole anterior 29 of the tenon 28 and the corresponding holes of the clevis 47 - see detail G of FIG. 16, as well as FIG. 5. The arrow holder 5 is then constituted in a rigid structure, triangular in shape, the three sides of which are formed respectively by the top of the mast-cabin 10, by the front part 21 (in particularly the uprights 23) and by the rear part 22 (in particular the amounts 42).

A small platform 80 with railing, carried by the rear part 22 of the arrowhead 5, allows responders to safely perform the broaching operations previously described, linking the respective vertices of the front 21 and rear 22 parts of the jib holder 5.

It will be noted that after completion by the axis 79 of the final pinout, linking the tops of the front 21 and rear 22 parts of the jib holder 5, the connecting rods retainer 48 are released from any effort, the pin axis 63 coming at a point intermediate the length of each light 64 - see detail J in the figure 16.

The slings 76 can now be detached from the boom 6, the latter being held in a substantially horizontal position by the single tie rods 13 and 14, stretched between the top 15 of the arrowhead 5 and points 16 and 17 - see figure 17.

Finally, using the lifting gear now released, it is proceeded to ballast of the jib 8, by bringing and fixing, at the rear of the structure of this counter-jib 8, the blocks constituting the counterweight 9 - see FIG. 18. The crane is then ready to enter service.

Optionally, as illustrated in Figures 15 to 17, one or more counterweight 9 can already be installed on the counterjib 8 in the intermediate stages of the crane assembly.

FIGS. 19 to 22 illustrate, as a variant of what has just been described, another version of the pinout of the upper part of the arrowhead 5. This variant implements the following means, clearly visible in FIG. 20 as well only on details N and R:

The front part 21 of the arrow holder 5 has, at its top, a tenon 28 provided with a rear hole 30 for the broaching of the line of tie rods 19 of the counterjib 8, and a front hole 29 for the final broaching of the two parts, front 21 and rear 22, respectively, of the arrowhead 5.

The rear part 22 of the arrow holder 5 has, at its top, a yoke 47 provided with a hole 84 for the final broaching of the two parts 21 and 22 of the arrowhead 5. The yoke 47 is also provided, externally, with side washers 85 coaxial with the above-mentioned hole 84; these washers 85, welded on clevis 47, have an internal diameter equal to that of the axis of final pinout.

The line of tie rods 19 of the jib 8 comprises, at its end front, two connecting rods 86 and 87. The first connecting rod 86 is a double connecting rod, composed of two symmetrical plates, which ensures the connection between the end of the tie rod line 19 and the side washers 85 carried by the upper yoke 47 of the rear part 22 of the arrowhead 5. The second connecting rod 87, in particular in the form of a yoke, is housed inside the double rod 86, and it is connected to the end of the line of tie rods 19, to the same point as the first connecting rod 86. The center distance of the second connecting rod 87 is slightly lower, for example 2 mm, than that of the double rod 86.

The broaching of the counterjib 8 is carried out by connecting the double tie rod 19 at the upper end of the rear part 22 of the jib holder 5 by means of the first connecting rod (double connecting rod) 86, the second connecting rod 87 being on standby.

The pinout of the arrow 6 is carried out by connecting the triangulation of this arrow, at its upper end and more particularly the hole rear 30 of the stud 28, at the end of the double tie 19 of the counter-jib 8, via the second connecting rod 87.

These broaching operations are carried out in the position of the arrow 6 shown in FIG. 18 (arrow slightly pivoted upwards), so similar to what has already been illustrated in FIG. 15.

In the next phase (Figure 20), the arrow 6 is lowered, and the tie rods 13 and 14 of arrow 6 are tensioned. Simultaneously; the line of tie rods 19 of the jib 8 is driven forward by the second connecting rod 87, and the rear part 22 of the arrowhead 5, held by the first connecting rod 86, is driven forward by its own weight. The relative movement between the rear part 22 and the front part 21 of the arrow holder 5, which then occurs, substantially corresponds to the difference in center distances between the first connecting rod 86 and the second connecting rod 87, and this allows the perfect alignment of the holes of respective final pinout 29 and 84 of the two parts 21 and 22 of the arrowhead, during the tensioning of the tie rods.

It is then proceeded to the final broaching, linking the tops of the parts front 21 and rear 22 of the arrowhead 5 between them, by introducing an axis 79 through the previously aligned holes - see detail R of the Figure 21. The retaining rods 48 are then released from any effort, likewise as the stand 34 - compare the details L and M of figure 19 respectively with details P and Q in figure 21.

Finally, the slings 76 can be detached from the boom 6, maintained by the only tension rods 13 and 14, this final phase being shown on the figure 22.

This variant has the advantage, in comparison with the previously described version, to no longer require a very precise realization of the centers of the holes at the tops of the front 21 and rear 22 parts of the arrow-holder 5, therefore to overcome a dimensional constraint.

The rotating part 4 of the crane can be dismantled by means of a series of reverse operations from those previously described, separating first the two parts 21 and 22 of the jib holder 5, then by handling on the one hand, the assembly composed of arrow 6, of the front part 21 of the arrow holder 5 and tie rods 13 and 14, and on the other hand the assembly composed of the counterjib 8, the rear part 22 of the jib holder 5 and the double tie 19. Once separated, the two parts 21 and 22 of the arrow holder 5 provide a minimum space requirement, for their transport and storage.

• en modifiant l'ordre des opérations de prémontage au sol de l'ensemble avec flèche et de l'ensemble avec contreflèche, voire même en réalisant ces opérations simultanément pour les deux ensembles .
• en appliquant le même procédé, avec les adaptations nécessaires, à des grues avec flèches et/ou contreflèches possédant des tirants en nombre différent de celui considéré dans les exemples précédemment décrits, et illustrés au dessin ;
• en constituant le porte-flèche, toujours par réunion d'une partie avant et d'une partie arrière séparables, mais avec la forme d'un polygone à quatre côtés, tel que rectangle ou trapèze, au lieu d'une forme triangulaire (en vue de côté) ;
• en modifiant la constitution des deux parties du porte-flèche, ou de l'une d'elles, la partie avant ou arrière du porte-flèche étant réalisable sous la forme d'un seul montant, au lieu d'une structure en treillis à deux montants.

One would not depart from the scope of the invention, as defined in the claims:

• by modifying the order of ground pre-assembly operations for the jib assembly and the jib assembly, or even performing these operations simultaneously for the two assemblies.
• by applying the same process, with the necessary adaptations, to cranes with jibs and / or jibs having tie rods in numbers different from that considered in the examples previously described, and illustrated in the drawing;
• by constituting the arrowhead, always by joining a separable front part and a rear part, but with the shape of a polygon with four sides, such as rectangle or trapezoid, instead of a triangular shape (in side view) ;
• by modifying the constitution of the two parts of the arrow holder, or of one of them, the front or rear part of the arrow holder being able to be produced in the form of a single upright, instead of a lattice structure with two amounts.

Claims (24)

Method for mounting the rotating part, more particularly the mast head of a tower crane, the rotating part (4) of which comprises a mast head or jib holder (5), an articulated distributing jib (6) by its end posterior to the front face of the jib holder (5) and connected to the top (15) of the jib holder (5) by one or more tie rods (13, 14), and a jib (8) articulated by its end anterior to the rear face of the arrow holder (5) and connected to the top (15) of the arrow holder (5) by one or more tie rods (19),
characterized in that it consists: in assembling on the ground an assembly formed by the jib (8), its tie rod (s) (19) and a rear part (22) of the jib holder (5) produced in two separable parts (21, 22), namely a part front (21) and the rear part (22), and also to assemble on the ground another assembly formed by the arrow (6), its tie rod (s) (13, 14) and the front part (21) of the arrow holder ( 5); using a handling or lifting device, to lift the pre-assembled assembly formed by the jib (8), its tie rod (s) (19) and the rear part (22) of the jib holder (5), and to assemble by broaching this assembly along a horizontal axis (18), on the rotary pivot or on a mast or mast-cabin element (10) linked to this rotary pivot; using the handling or lifting device, to lift the pre-assembled assembly formed by the arrow (6), its tie rod (s) (13, 14) and the front part (21) of the arrow holder (5 ), and to assemble by broaching this assembly, along a horizontal axis (77), on the rotary pivot or the mast-cabin (10); to link together by at least one broaching axis (78, 79) the respective vertices (28, 47) of the front (21) and rear (22) parts of the jib holder (5). Method according to claim 1, characterized in that the assembly on the ground of the assembly formed by the arrow (6), its tie rod (s) (13, 14) and the front part (21) of the arrow holder (5) is made by hinging the base (26) of the front part (21) of the arrow holder (5) at the rear end (31) of the boom foot (12), and also linking the front part (21) of the boom holder (5) at the jib foot (12) by means (34) limiting the pivoting, towards the front and towards the rear, from the front part (21) of the jib holder (5) relative to the arrow (6). Method according to claim 2, characterized in that the angle between the two limit positions of the front part (21) of the arrow holder (5) is around 5 °. Method according to any one of claims 1 to 3, characterized in that the assembly operation on the ground of the assembly formed by the arrow (6), its tie rod (s) (13, 14) and the front part (21) of the jib holder (5) includes, for the or each tie (13, 14) of the boom (6), the fixing of a rear part (13a, 14a) of the tie rod at the top (28) of the front part (21) of the arrowhead (5), the fixing of a front part (13b, 14b) of the same tie in one intermediate point (16, 17) of the arrow (6), the bringing together of the parts rear (13a, 14a) and front (13b, 14b) of the tie rod (13, 14) using a sling (60) pulled by an auxiliary handling or lifting machine, and the broaching of the front end (57) of the rear part (13a, 14a) of the tie rod on the end rear (58) of the front part (13b, 14b) of the tie rod. Method according to any one of claims 1 to 4, characterized in that the lifting of the assembly formed by the jib (8), its or its tie rods (19) and the rear part (22) of the jib holder (5) is produced using slings comprising front slings (65) attached to the base (68) of the rear part (22) of the arrow holder (5), and passing over a deflection member (53) carried by this rear part (22), and rear slings (66) attached (in 70) to the structure of the jib (8), so as to maintain the structure of the substantially horizontal jib (8) during the lifting of this assembly and its pinout on the turning pivot or the mast-cabin (10), the or the tie rods (19) of the jib (8) being aligned and tensioned. Method according to any one of claims 1 to 4, characterized in that the lifting of the assembly formed by the jib (8), its or its tie rods (19) and the rear part (22) of the jib holder (5) is produced using slings comprising front slings (71) attached to the base (68) of the rear part (22) of the arrowhead (5), but not undergoing any deviation, and rear slings (72) attached (at 70) to the structure of the jib (8), the slings (71,72) being of a length adapted to maintain the structure of the counter-jib (8) in an inclined position relative to the horizontal, during lifting of this assembly and its pinout on the turning pivot or the mast-cabin (10), the rear part (22) of the jib holder (5) being pivoted backwards so that the tie rod (s) (19) remain relaxed, and in that, after broaching of said assembly on the rotary pivot or the mast-cabin (10), the structure of the jib (8) is brought back to the horizontal, and the tie rod (s) (19) are tensioned. Method according to claim 6, characterized in that the structure of the jib (8) forms, with respect to the horizontal, an angle (a) equal or greater than 15 °, during the lifting and broaching of the assembly concerned. Method according to any one of claims 1 to 4, characterized in that, after the pre-tensioning of the tie rod (s) (19) (8), by tilting the rear part (22) of the jib holder (5) towards the front, the lifting of the assembly formed by the jib (8), its tie rod (s) (19) and the rear part (22) of the jib holder (5) is produced using slings comprising front slings (71) and rear slings (72) attached (at 68, 70) to the structure of the jib (8), so as to maintain the structure and substantially horizontal jib (8), or at least slightly inclined on horizontal, during the lifting and pinning of the assembly concerned. Method according to claim 8, characterized in that the structure of the counter-jib (8) forms, with respect to the horizontal, an angle (α) of the order 6 °, during the lifting and broaching of the concerned assembly. Process according to any one of Claims 1 to 9, characterized in that it still comprises, after the broaching operation (in 18) of the assembly comprising the jib (8) and the rear part (22) of the jib holder (5) on the movable pivot or the mast-cabin (10), making a connection provisional (48, 49, 56, 63) with clearance holding the rear part (22) of the boom holder (5) in the upright position, pending the pinout (at 78, 79) of the top (28) of the front part (21) of the arrow holder (5) on the top (47) of said rear part (22). Process according to any one of Claims 1 to 10, characterized in that the lifting of the assembly formed by the arrow (6), its or its tie rods (13, 14) and the front part (21) of the arrow holder (5) is made at using slings (76), keeping the arrow (6) substantially horizontal until it is pinned on the turning pivot or the mast-cabin (10), then rotating the arrow (6) slightly upwards around the axis (77) carrying out this pinout, to make (in 78) an approach pinout with clearance between the top (28) of the front part (21) and the top (47) of the part rear (22) of the boom holder (5). Method according to claim 11, characterized in that after the realization (in 78) of the approach pinout, there is a pivoting reverse of the arrow (6) driving forward the rear part (22) of the arrow holder (5), and to the achievement of a final pinout (in 79) ensuring the stiffening of the arrowhead (5), the final pinout being carried out at the point intersection of a circular arc, centered on the broaching axis (18) of the counter-jib (8) on the turning pivot or the mast-cabin (10), according to which moves the final broaching hole (84) from the top (47) of the rear part (22) of the arrowhead (5) and another arc, centered on the broaching axis (77) of the arrow (6) on the turning pivot or the mast-cabin (10), according to which moves the final broaching hole (29) from the top (28) of the front part (21) of the arrow holder (5). Device for implementing the method of mounting the rotating part of a tower crane according to any one of claims 1 to 12, characterized in that it comprises, in combination: a front part (21) of a jib holder (5), comprising uprights (23) rigidly connected to each other and provided at their lower ends with tenons (26) or yokes, cooperating with yokes (31) or tenons provided for the posterior end of the jib foot (12), as well as with yokes (54) or tenons provided on the rotary pivot or the mast-cabin (10), a rear part (22) of the arrowhead (5), separable from the front part (21) and comprising uprights (42) rigidly linked together and provided at their lower ends with tenons (45) or yokes, cooperating with yokes (50) or tenons provided at the anterior end of the structure of the jib (8), as well as with yokes or tenons (55) provided on the rotary pivot or the mast-cabin (10), the front (21) and rear (22) parts of the jib holder (5) being still provided, at their respective tops, with complementary members such as tenon (28) and clevis (47), for the connection by broaching between these two parts (21, 22). Device according to claim 13, characterized in that the part front (21) of the boom holder (5) is connected, by means of a stand (34) consisting of two unequal sections (35, 36) hinged together (at 37), at the rear part of the boom foot (12), one of the sections (35) of the stand (34) comprising a support member (39) on the mast foot (12), so as to limit the pivoting, forward and backward, of the front part (21) of the arrow holder (5), relative to the arrow (6). Device according to claim 13 or 14, characterized in that the or each tie (13, 14) of the arrow (6) comprises a rear part (13a, 14a) embossed at the top of the front part (21) of the arrow holder (5) and a front part (13b, 14b) separable from the rear part and linked to a point (16, 17) of the arrow (6), the front end of the rear part (13a, 14a) comprising a yoke (57) and the rear end of the front part (13b, 14b) comprising a post (58) preferably with light or vice versa, and means comprising a sling (60) and pulleys (61) being provided for the approximation of the rear (13a, 14a) and front (13b, 14b) parts of the tie rod, view of their connection by broaching, by an axis connecting the clevis (57) with the tenon (58). Device according to claim 15, characterized in that, in the in the case of an arrow (6) with two lines of tie rods (13,14), the rear parts (13a, 14a) of the two lines of tie rods are joined by a double connecting rod (82) coming hang on a boss (83) formed around a hole (29) of the stud (28) located at the top of the front part (21) of the arrow holder (5). Device according to any one of Claims 13 to 16, characterized in that the rear part (22) of the arrow holder (5) has retaining rods (48), designed to connect the top (47) of this part rear (22) to the movable pivot or to the mast-cabin (10), the lower end of each connecting rod (48) preferably carrying a yoke (49) provided to cooperate with lugs (56) of the cabin mast (10), by means of an axis of pinout (63) passing through a lumen formed in each tab (56). Device according to any one of Claims 13 to 17, for the implementation of the method according to claim 5, characterized in that the rear part (22) of the boom holder (5) comprises a strap (53) articulated on its main uprights (42), and designed to offset the attachment point of the handling slings (65). Device according to any one of Claims 13 to 18, for the implementation of the method according to claim 8 or 9, characterized in that that a rear stop is provided which maintains the tilting position of the rear part (22) of the jib holder (5), to maintain the pre-tension of the tie rods (19) of the jib (8). Device according to any one of Claims 13 to 19, characterized in that the additional post (28) and the clevis (47), provided to the tops of the front (21) and rear (22) parts of the jib holder (5), have corresponding front and rear holes (29, 30), respectively for carrying out an approach pinout (axis 78) with play, and a final pinout (axis 79), between the tenon (28) and the clevis (47). Device according to claim 20, characterized in that the one or more tie rods (19) of the jib (8) have, at the anterior end, two mounting rods (86, 87), namely a double rod (86) ensuring the connection with side washers (85) carried by the yoke (47) provided at the top of the rear part (22) of the jib holder (5), and another connecting rod in particular form of yoke (87), housed inside the double connecting rod (86) and having a center distance slightly less than that of the double connecting rod (86), the other connecting rod (87) being provided to be connected to a rear hole (30) of the stud (28) provided at top of the front part (21) of the arrow holder (5), before the final broaching. Device according to any one of Claims 13 to 21, characterized in that it is still provided, at the intermediate height of the arrow holder (5), at least one connecting bar (81) between the front (21) and rear parts (22) of the arrow holder (5). Device according to any one of Claims 13 to 22, characterized in that the base of the rear part (22) of the arrow holder (5), the front end of the jib (8) and the top of the cabin mast (10) are linked together at a single point, along the same broaching axis (18). Device according to any one of Claims 13 to 23, characterized in that the base of the front part (21) of the arrow holder (5), the rear end of the boom (6) and the top of the mast-cabin (10) are linked together at a single point, along the same broaching axis (17).

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