FR2706882A1 - - Google Patents

Abstract

The invention relates to the mounting of the working jib (7) and of the associated counterbalancing jib (8) of tower cranes, used on building and civil engineering work construction sites. The jib elements (15,16,17,18) are aligned and assembled on the ground with their stay (13), then the jib stay (13) and, possibly, the one (111) belonging to the counterbalancing jib (8) is or are lifted up and aligned with the aid of an auxiliary item of mounting plant (69). Next, using the same item of plant (69), the whole of the jib (7) or of the counterbalancing jib (8) together with its stay (13,111) lifted up and aligned is raised and is offered up facing the top of the tower (6) so that the free ends (56,122) of the stays (13,111) are offered up correctly to the very top of the head of the tower (6) to allow direct connection (at 14,138). This method improves safety, and it decreases the duration for which the auxiliary item of mounting plant (69) is immobile.

Description

Z "Method and apparatus for mounting tower cranes"

  The present invention relates to a method for mounting tower crane arrows and a device for carrying out the method. This invention finds particular application in the mounting of the dispensing boom and the associated counterfilter, constituting support of the counterweight, tower cranes used on construction sites of buildings and works

public.

  The distributing boom of such a crane generally has a symmetrical triangular cross-section whose upper vertex corresponds to an upper chord, while the two lower vertices correspond to lower chords which form a raceway for a trolley the yard. This distributing arrow consists essentially of aligned arrow elements and assembled together by means of broaching pins arranged at the ends of the upper chord and the lower chords, and a retaining tie, formed of several parts assembled together. end-to-end by means of broaching pins mounted perpendicular to the median plane of the boom, the front end of which is articulated at the upper chord of an element of boom by means of a mounted broaching pin

  also perpendicular to the median plane of the arrow.

  The mounting of such an arrow is generally carried out as follows: The distributing arrow is aligned and assembled on the ground with its tie resting on the upper chord in the direction of the foot element arrow, then equipped with slings for its lifting with the aid of an auxiliary assembly machine, such as a mobile crane. At the end of lifting, the articulation of the foot of arrow is presented and stitched on the front face of the head of m & t or on the rotating pivot. In a first way of operating, the boom being held in position by the auxiliary mounting apparatus, a hauling is carried out between the free end of the tie rod and its point of attachment to the top of the masthead. With the help of a winch or a cable-puller, you pull on the free end of the hauling, until you can do the pulling on the top of the mast head. The hauling operation is carried out at height and requires the intervention of one or more assemblers in difficult working conditions, especially in the event of wind or other inclement weather, while the auxiliary assembly machine is immobilized during all

  time, this machine being generally rented at a high cost.

  According to another way of operating, even more delicate, it uses the auxiliary mounting device to raise the boom and its pulling around the articulation of the foot of the arrow until it can perform a broaching between the free end of the tie rod waiting on the foot of the boom and the end of a ramp of sufficient length waiting at the top of the masthead. The broaching being carried out, the boom is always lowered by means of the auxiliary assembly machine until

  the tie rod is aligned and in tension.

  The counterfleche is mounted in a manner similar to that of the distributor arrow and

  therefore presents the same disadvantages.

  The object of the present invention is to overcome the disadvantages set out above, by providing a method for mounting tower crane spindles and a device for implementing the method which improves safety and reduces the duration

  immobilisation of the auxiliary assembly machine.

  For this purpose, the method for mounting the tower crane arrows according to the invention consists, for mounting a dispensing boom, and also possibly a counterfleche, provided with a retaining tie whose one end is hinged to an element of boom or counter-arrow, and whose other end, initially free, is intended to be linked by stitching to the top of the mast head of the crane: - to align and assemble on the ground the elements of arrow with pulling them down; - to raise and align the tie rod and, if appropriate, the counterflight, still on the ground, so that the free end of the tie rod is placed and held high above the boom or boom; counterfleche, so that this free end is then correctly presented for direct pinning at the top of the masthead, - to lift the whole of the arrow or the counterfleche with its pulling kept raised and aligned, - to present at the end of lifting, the arrow or counter-arrow in front of the mast head, - to assemble the arrow or counter-arrow at the base of the mast head, and - to directly insert the free end of the arrow rod or counter-arrow at the top of the

masthead.

  As can easily be seen, initially raising the tie rod to a suitable height, above the distributing arrow or the counter-arrow, makes it possible to present the arrow or the counter-arrow in front of the mast head, in a configuration allowing an assembly directly from the free end of this tie rod, thus rendering the current hauling system useless. The assembly can therefore be performed more quickly and more easily, and therefore in a better safety conditions for the personnel and by immobilizing an auxiliary assembly machine for a reduced time, hence a significant saving. Advantageously, this auxiliary mounting device such as hydraulic mobile crane is used both to raise and align the tie rod, the arrow or the counterfleche still on the ground, than to then perform the lifting of the entire boom or the counter-arrow with its tie rod held up and aligned, and

  his presentation to the head of mat.

  The device according to the invention, for the implementation of the method defined above, comprises on the one hand at least one sling, or a set of slings, connecting a fixed point of the boom foot element, in the case of a dispensing boom, or a fixed point of the lash, at a fixed point of the tie rod, and adapted to be suspended directly or indirectly from the hook of an auxiliary assembly machine, and secondly means of suspension, of the rudder type, allowing the lifting of the whole of the distributing arrow or the

  counterfeit licks with its pulling held up and aligned.

  Thus, a pull can be exerted first on the tie rod, to bring it into the raised position while the distributing arrow or the counterfleche still remains on the ground, before the whole of the distributing arrow or

the counterfleche is raised.

  According to a preferred embodiment of the device, concerning the implementation of the method for mounting the distributing boom of a tower crane, it comprises, in addition to at least one sling connecting a fixed point of the foot element. arrow at a fixed point of the tie rod, a lifting pin having a first end articulated to said fixed point of the tie rod, while its second end comprises support and guide means for its movement along the upper chord of the boom member, means being further provided for stopping the punch in the upright position and for securing it to said chord in this position. The second end of the lifting pin may carry a rolling roller, movable along the upper chord of the boom foot and, when the punch reaches its upright position, to come into contact with a bumper carried by said chord. This punch is raised at the same time as the tie rod, and by its rigidity it ensures the maintenance of the pulling in raised and aligned position, and during the lifting of the whole of the dispensing arrow and its

  presentation in front of the masthead.

  Advantageously, the pulling of the distributing boom is made in several successive parts, whose respective lengths correspond substantially to those of the boom elements on which the parts of the tie rod are mounted for transport, the parts of this tie rod being joined together,

  mounting, by means of connecting rods.

  According to another characteristic, still relating to the device according to the invention applied to the deflecting boom of a tower crane, this device further comprises an boom lifting beam comprising two fixing flanges on the upper chord of the distributing boom, one of which carries a rod of fixed length and the other carries a ramp of adjustable length, to correct the slope of the dispensing boom. According to a complementary feature, the fixed length connecting rod and the adjustable length ramp are positioned laterally on the respective flanges, by means of thick washers arranged on either side of the connecting pin axes of the connecting rod and the shoulder strap on the respective flanges, to correct the cant of the distributing boom.35 The spreader is used with the auxiliary hoist, to lift the entire boom and present it in front of the masthead, after having done the lifting of the tie rod and the punch using the same auxiliary assembly machine. This lifter remains fixed permanently on the dispensing boom, in the region of the center of gravity of it. According to another embodiment of the device according to the invention, more specifically adapted to the mounting of the counterfleche of a tower crane, the device comprises a spreader, the midpoint of which serves for the hook suspension of an auxiliary machine of assembly, and two sling systems attached to the ends of the spreader and mounted on either side of the counterfleche, each having a rear sling directly connecting the spreader to a fixed point of a chord of the counterflèche and a front sling in two parts, one of which connects the lifter to the tie rod for lifting the tie rod and the other connects the tie rod to a fixed point of the chord of the counterflight for lifting the entire counter-flap with its raised pull. Thus, a single assembly consisting of slings and a rudder is here used to lift the tie rod against the counterfleche and lift all of the counterfleche with its raised pull, the two operations being directly one after the other. on the other, without changing the suspension point on the hook

of the auxiliary assembly machine.

  According to another aspect of the invention, the broaching of the free ends of the tie rods at the top of the masthead is facilitated by the presence of lights, preferably provided at the free end of the tie rod on the side of the distributing arrow, and on a connecting rod

  coupling on the side of the counterfleche.

  In any case, the invention will be better understood

  using the following description, with reference to the drawing

  schematic annexed which, by way of non-limiting examples, illustrates an embodiment of the method for mounting the tower crane arrows, and represents embodiments of the device for the implementation of

this process.

  Figure 1 is an overall view in the mounted state of a tower crane to which the method according to the invention applies; Figure 2 is a perspective view of the boom foot member carrying the device for raising and aligning the retaining tie, for carrying out the method according to the invention in the case of a dispensing boom; Figure 3 is a perspective view of an intermediate boom member showing the arrangement of the corresponding portion of the tie rod in the transport position; Figure 4 is a perspective view of the attachment-pulling element of the dispensing boom; Figures 5, 6 and 7 illustrate three successive phases of lifting and alignment of the tie rod; Figure 8 illustrates the lifting operation of the whole of the dispensing boom with its raised pulling; Figures 9 and 10 illustrate, in perspective and in detail, the presentation of the arrow for mounting on the masthead; Figure 11 is a detailed perspective view of the punch for lifting and aligning the pulling of the dispensing boom; Figure 12 is an overall perspective view of the lifter for lifting all of the dispensing boom; Figure 13 is an overall perspective view of the device for carrying out the method according to the invention for mounting the counterfleche; Figure 14 is a detailed perspective view of

  the upper part of the masthead of the crane.

  The crane shown in FIG. 1 comprises, in known manner, a fixed or rolling basic chassis 1, a mast 2 of adjustable height surmounted by a fixed pivot 3 supporting, via an orientation device 4, a pivot pivot 5 itself surmounted by a mat head 6. This crane is provided with a dispensing arrow 7 and a counter-flange 8, with counterweight, both equipped with a device for the mounting

according to the invention.

  The boom 7 is equipped with a carriage 9 and a translation mechanism 10 of the carriage 9, as well as a hoisting winch 11 for the handling of loads on the construction site; it is mounted articulated around a horizontal axis 12 on the front face of the masthead 6 or on the revolving pivot 5, and is maintained in a substantially horizontal position by means of a tie 13 bound at 14 at the top of said dispenser head 7 of adjustable length comprises a foot member 15, one or more intermediate members 16, a tie-pulling element 17 and one or more current elements 18 located beyond

the fastening-pulling element 17.

  The tie rod 13 of the distributing boom 7 is formed of several successive parts 19, 20, 21 whose respective lengths correspond substantially to those of the boom elements, more particularly the foot element 15, the intermediate element or elements 16 and tie-pulling element 17 limited to its part located under the tie rod. As shown in FIGS. 2, 3 and 4, the various parts 19, 20, 21 of the tie rod 13 are arranged,

  for transport, above the corresponding boom elements 15,16,17.

  Referring to Figure 3, the intermediate portions 20 of the tie rod 13 are each composed, at the rear, of a long element 22 of circular section terminated at both ends by a yoke 23, and at the front , a rod 24 provided with a handle 25, forming tenon, assembled together by means of an axis 26 mounted perpendicular to the line of the tie rod 13 and the median plane of the arrow 7. In transport position, the long member 22 rests above the upper chord 27 of the corresponding intermediate boom member 16 by means of a front support 28 provided with a retaining pin 29 and a rear support 30 provided with a pin pin 31 on which it is positioned, while the rod 24 is folded on the front end of

said chord 27.

  As shown in Figure 4, the front portion 21 of the tie rod 13 is composed at the rear of a long member 32 of circular section terminated at its front end by a pin 33 and at its rear end by a clevis 34, and at the front, by a double strap, forming a yoke, assembled together by means of an axis 36. The double shoulder strap 35 is, moreover, assembled on the upper chord 37 of the fastener-pulling member of arrow 17 at a gusset 38, forming tenon, by means of an axis 39. The axes 36 and 39 are mounted also perpendicular to the line of the tie rod 13 and the median plane of the arrow 7. In transport position, the long-length member 32 rests above the upper chord 37 of the tie-and-pull member 17 of the boom 7 by means of a rear support 40 provided with an axle

withholding 41.

  The rear portion 19 of the tie rod 13 comprises, as shown in FIG. 2, two long-length elements 42, 43 of circular section mounted in the extension of one another through a support 44 whose upper part receives an axis 45 for hooking a sling 46 serving to lift the tie rod 13 of the distributing boom 7, while its lower part receives an axis 47 mounted perpendicular to the line of the tie rod 13 and the median plane of the arrow 7 serving both at the assembly of said elements 42,43 and at the articulation of a punch 48 also serving to lift said tie rod 13. The ends assembled at 47 of the long-length elements 42,43 form respectively a pin 49 and a clevis 50 which abut against each other by means of a support plate 51 when said

  elements 42,43 form an angle smaller than the flat angle.

  The rear portion 19 of the tie rod 13 further comprises at the front a rod 52 provided with a handle 53, forming a pin, for its assembly, by means of a pin 54 mounted perpendicular to the line of the tie rod 13 and the median plane of arrow 7 at the front end of both

  elements of great length 42,43 forming a clevis 55.

  The rear end of the set of two elements 42,43 forms a pin 56 provided with an oblong hole 57 to facilitate the assembly at 14 of the tie rod 13 at the top of the

mat head 6.

  As shown in detail in FIG. 11, the punch 48 articulated at one end at 47 to the tie rod 13 is provided at its other end with a diabolo-shaped roller 58 capable of rolling on the upper chord 59 of

  circular section of the boom foot element 15 -

see also Figure 2.

  In the transport position, the punch 48 is folded at the front under the rear portion 19 of the tie rod 13 and the assembly of the two long-length members 42,43 rests above the upper chord 59 of the foot element 15 by means of a front support 60 provided with a retaining pin or broaching 61 and a rear support 62 provided with a broaching pin 63, on which it is positioned, while the rod 52 is folded over the front end of said frame 59. The raising and aligning of the tie rod 13 of the dispensing boom 7, illustrated in Figures 5, 6 and 7, are as follows: The elements 15, 16,17,18 of the fully equipped arrow 7 are aligned and assembled together on the ground. The portions 19, 20, 21 of the tie rod 13 are then assembled by means of pins 64, 65 mounted perpendicular to the line of the tie rod and to the median plane of the arrow 7 by connecting the rods 52, 24 respectively to the clevises

23.34.

  The arrow 7 thus equipped is mounted on at least two trestles 66.67 of sufficient height for the passage of the carriage 9 equipped. The bridge 66 is disposed at the rear of the jib foot 15, while the bridge 67 is disposed in front of the jib 7, beyond the axis of assembly of the tie rod 13, to prevent the tilting of

  the arrow 7 when raising said tie rod 13.

  With the aid of a hook 68 of an auxiliary assembly machine 69 disposed in the axis of the arrow 7 on the rear side of the latter, the free end of the lifting sling 46 suspended from the axis 45 of the support 44 of the rear portion 19 of the tie rod 13; the hooking of the sling 46 hook 68 is feasible at ground level. Then, as shown in FIG. 5, the hook 68 of the auxiliary assembly machine 69 is wound up again.

stretch the sling 46.

  Continuing to raise the hook 68 pulling 13 is lifted gradually, part after part, while under the action of its own weight, the lifting punch 48 suspended in 47 pulling audit 13 is recovering by rolling, through its pebble 58, on the

  upper chord 59 of the boom foot element 15 -

see figure 6.

  During this operation, a double retaining sling 70 connecting a double attachment point 71 located at the rear end of the boom foot member 15 to an axis 72 located at the top of the lifting punch 48, is progressively tightened. At the end of the operation the double retaining sling 70 is stretched and the tie rod 13 is substantially aligned in the raised position, while the lower end of the lifting punch 48 abuts on an axis 73 integral with a fixed support 74 on the upper chord 59, substantially in the middle of the length of the boom foot member 15 see Figures 2 and 7. In this position, the lower end of the lifting punch 48 is locked by hand or automatically

  by means of an axis 75 on the support 74.

  To lift the assembly consisting of the fully equipped boom 7 and the tie rod 13 in the raised position, a spreader 76 such as that shown in FIG. 12 is used. The spreader bar 76 has two fastening flanges 77, 78 on the upper chord 79 of the arrow 7. Each flange 77,78 is formed of an upper yoke 80 disposed on a node 81,82 of the structure of the arrow 7 and two lower yokes, respectively 83 and 84, arranged on either side of the node 81,82. The assembly of the lower stirrups 83 and 84 on the upper stirrup 80 is performed by means of screws 87,88. The immobilization in rotation, around the upper chord 79 of the boom 7, flanges 77,78 is provided by pins 85 engaged in the bracing 86 of the boom 7 through the lower stirrups 83,84. Each upper yoke 80 carries at its upper part a handle 89,90 shaft mounted perpendicular to the median plane of the arrow 7. The flange 77 resumes by its axis 89 a rod fixed length 91 extended by a first lifting sling 92; washers 93 of different thicknesses are distributed on demand on either side of the axis 89 between its supports on said flange 77 and the rod 91. On the other side, the flange 78 resumes by its axis 90 a shoulder strap adjustable length 94 extended by a second lifting sling; washers 96 of different thicknesses are also distributed on demand on either side of the axis 90. The adjustable length strap 94 comprises an adjustable rod 97 articulated at one end on the axis 90 and whose body comprises several pin holes 98, a binocular 99 at one end end to a pin hole 98 of the adjustable rod 97 and, if necessary, an extension rod 100 pinned at 101 to the other end of the

twin 99.

  The slope of the boom 7 is adjusted by adjusting the length of the shoulder strap 94, while its slope is corrected by the distribution of the washers 93 and 96 on either side of the axes 89 and 90. In principle, the adjustments are made once and for all for an arrow of

given length.

  The lifter 76 being mounted adjusted, the assembly consisting of the arrow 7 fully equipped and the pulling lever 13 in the raised position, is raised to the level of the mat head 6 by means of the auxiliary assembly machine

  69, this operation being illustrated by FIG. 8.

  As shown in FIGS. 9 and 10, the arrow 7 thus raised is presented for the assembly of the foot of

  arrow 15 on the front of the mat head 6.

  The assembly is made by means of two shafts 12 connecting two gussets 102 forming tenons of the rotating pivot 5 to clevises 103 extending rearwardly of the lower chords 104 of the boom foot 15. Inside the gussets 102, a device guide 105 of the angle type ensures the pre-centering of the yokes 103 on the

  gussets 102 and facilitates the establishment of the axes 12.

  The assembly of the jib foot 15 on the front face of the mat head 6 being formed, the free rear end of the tie 13 forming a post 56 is in the vicinity of the top 106 of the masthead 6. 106 a double shoulder strap 107 forms a clevis intended to be assembled with the pin 56 - see also FIG. 14. An access ladder 108 and an intervention platform 109 are provided for the positioning of the link 14 by an editor. The realization of the assembly of the tie rod 13 at the top 106 of the mat head 6 is facilitated by the lateral flexibility of the tie rod 13 and the oblong hole 57 of the post 56. For its part, the counterfleche 8 shown in detail in FIG. 13 is hinged at 110 on the rear face of the masthead 6 or the swivel pivot 5 at the same height as the distributing boom 7 and is maintained in substantially horizontal position by means of a tie rod 111 hinged at 138 to top 106 of said masthead 6. The tie rod 111 is composed of two identical long elements 112 of circular section mounted symmetrically on either side of the counter-flange 8, and terminated at both ends by clevises 113, 114. The rear yokes 113 are assembled on the chords 115 at gussets 116, forming tenons, by means of pins 117. The front yokes 114 are assembled by means of pins 118 on a connecting element 119 consisting of two flat bars 120 folded at their base 121 forming tenon and at their top 122 and joined by spacers 123 and 124. The connecting element 119 is maintained in the extension of the long-length elements 112 by means of a support plate 125

  between the clevises 114 and the studs 121.

  The device for carrying out the method for mounting the counterfleche 8 comprises a spreader 126, whose midpoint 127 serves to hook the hook 68 of the auxiliary assembly machine 69, and two identical sling systems attached to the ends 128 of the rudder 126 and mounted on either side of the counter-flange 8, each having a rear sling 129 directly connecting the end 128 of the rudder 126 to an attachment point 130 disposed at the rear of the corresponding chord 115 of the counterfleche 8 and a two-part front sling 131,132, the first portion 131 connects the end 128 of the spreader 126 to an attachment point 133 of the tie rod 111 and the other portion 132 connects a fastening point 134 of the pulling 111 at an attachment point 135 disposed at the front of the corresponding chord 115 of the counter-flap 8. The raising of the tie rod 111 and the mounting of the counter-flap 8 are carried out as follows: 8 is assembled on the ground with its tie 111 folded over the frames 115. Using the hook 68 of the auxiliary assembly machine 69 is hooked to the ground level 127 midpoint of the rudder 126, then progressively raises the hook 68. At first the rear slings 129 and the slings before 131 are stretched and the pulling 111 is raised until in their turn the slings before 132 are stretched. In a second step, the counterfleche 8 with its tie rod 111 in the raised position is raised at the mat head 6 by means of the auxiliary assembly machine 69. Then, as for the dispensing arrow 7, the counterfleche 8 is shown and assembled at 110 on the rear face of the mat head 6 or the rotating pivot, and the tie rod 111 is assembled at the top 106 of said mat head 6 by means of a connecting rod 136 provided with an oblong hole 137 to facilitate the mounting an axle 138 - see

Figures 1 and 14.

  If the invention is applied both to the distributing boom 7 and to the deflection 8 of the same tower crane, the first procedure is to assemble the counterflash 8, then possibly to put in place a partial counterweight on the counterfleche 8, and then

  when mounting the distributor arrow 7.

  As goes without saying, the invention is not limited to the only mode of implementation of the method, and to the only embodiments of the device for mounting the tower crane arrows, which have been described above, as examples; it embraces, on the contrary, all variants of implementation and application based on the same principle. Thus, in particular, that one would not move away from the scope of the invention by constructive modifications, for example on the detail of the tie rods 13 and 111, or by a recourse to all technical equivalents, such as the replacement of the roller 58 by a slider sliding on the upper chord 59 of the boom foot element 15. In the same vein, as regards the method, the order of succession of certain operations can be modified without

  depart from the spirit of the invention.

Claims (13)

  1. A method for mounting the tower crane arrows, for mounting a dispensing boom (7), and possibly also a counterflight (8), provided with a retaining tie rod (13, 111), one end of which is articulated (39,117) to an arrow element (17) or to the counter-arrow (8) and whose other end, initially free, is intended to be linked by broaching (at 14,138) to the top (106) of the mast (6) of the crane, characterized in that it consists of: - aligning and assembling on the ground the boom elements (15,16, 17,18) with their tie (13) folded; - to raise and align the tie rod (13) of the arrow (7) and, possibly, that (111) of the counterflash (8), still on the ground, so that the free end (56,122) of the tie rod (13,111) is placed and maintained in height above the arrow (7) or the counterfleche (8) so that this free end is then correctly presented for a direct pinning to the top (106) of the head of mat (6), - to lift the whole of the boom (7) or the counterfleche (8) with its tie rod (13,111) kept raised and aligned, - to have, at the end of lifting, the boom (7) or the counterfleche (8) opposite the mat head (6), - to assemble (in 12, 110) the arrow (7) or the counterfleche (8) at the base (5) of the mat head (6), and - to broach directly (in 14,138) the free end (56,122) of the tie rod (13,111) of the arrow (7) or   the counterfleche (8) at the top (106) of the mat head (6).   A method for mounting tower crane arrows according to claim 1, comprising the use of an auxiliary assembly machine (69) such as a mobile crane, characterized in that the auxiliary assembly machine (69) is used both for raising and aligning the tie rod (13,111), the arrow (7) or the counterfleche (8) still on the ground, than for then lifting the entire boom (7) or the counter-arrow (8) with its tie rod (13,111) held up and aligned, and its   presentation in front of the mat head (6).   3. Method for mounting tower crane arrows according to claim 1 or 2, characterized in that it is applied to the distributing boom (7) and to the counterfleche (8) of the same tower crane, and in that the first step is to assemble the counterfleche (8), and   then mounting the dispensing arrow (7).   4. Device for mounting tower crane arrows, for carrying out the method according to one   any of claims 1 to 3, characterized in that   it comprises on the one hand at least one sling (46,70), or a set of slings (129,131,132), connecting a fixed point (71) of the boom foot element (15), in the case a distributor arrow (7), or a fixed point (130, 135) of the counterfleche (8), at a fixed point (47, 133, 134) of the tie rod (13, 111), and capable of being suspended directly or indirectly from the hook (68). ) an auxiliary assembly machine (69), and on the other hand suspension means, of the rudder type (76, 126), allowing the lifting of the assembly of the distributing boom (7) or the counterflash (8) with its pulling (13,111) kept up and aligned.   5. Device for mounting tower crane arrows according to claim 4, characterized in that for mounting the dispensing boom (7) of a tower crane, this device comprises, in addition to at least one sling (70). connecting a fixed point (71) of the boom foot member (15) to a fixed point (47) of the tie rod (13), a lifting pin (48) having a first end articulated to said fixed point (47) of the pulling (13), while its second end has support and guide means (58) for its movement along the upper chord (59) of the boom foot element (15), means (73) , 74, 75) being further provided to stop the punch (48) in the upright position and to ensure its   broaching on said chord (59) in this position.   6. Device for mounting tower crane arrows according to claim 5, characterized in that the second end of the lifting pin (48) carries a roller (58), able to move along the upper chord ( 59) of the jib foot (15) and, when the punch (48) reaches its upright position, to come into contact with a bumper (73,74) carried by said chord (59).   7. Device for mounting tower crane arrows according to claim 5 or 6, characterized in that the tie rod (13) of the dispensing boom (7) is made in several successive parts (19,20, 21), including the respective lengths correspond substantially to those of the jib elements (15, 16, 17) on which the parts (19, 20, 21) of the tie rod (13) are mounted for transport, the parts (19, 20, 21) of this pulling (13) being joined together, at assembly, by means of rods coupling (24,52).   8. Device for mounting the arrows of cranes   in turn according to any one of claims 5 to 7,   characterized in that it further comprises an boom lifter (76) having two attachment flanges (77, 78) on the upper chord (79) of the dispensing boom (7), one of which (77) carries one rod of fixed length (91) and the other (78) carries a ramp of adjustable length (94), to correct the slope of the dispensing arrow (7).   9. Device for mounting tower crane arrows according to claim 8, characterized in that the fixed length link (91) and the adjustable length ramp (94) are positioned laterally on the respective flanges (77,78). by means of thick washers (93, 96) arranged on either side of the broaching axes (89, 90) of the connecting rod (91) and of the shoulder strap (94) on the respective flanges (77, 78) , to correct the   cant of the dispensing arrow (7).   10. A device for mounting tower crane arrows according to claim 8 or 9, characterized in that the adjustable length ramp (94) comprises an adjustable link (97) articulated at one end to the pinning axis (90). ) of said shoulder strap (94) on the flange (78) and having a plurality of pinholes (98) therein, a binocular (99) at one end directed to a pinhole hole (98) of the adjustable rod (97) and, if necessary, an extension rod (100) stitched (101) to the other end of the binocular (99).   11. Device for mounting the arrows   tower cranes according to one of claims 8 to   characterized in that the flanges (77,78) are each formed of an upper yoke (80) and two lower yokes (83,84), assembled together by means of screws (87,88), and are immobilized in rotation by axes (85) engaged in the bracing (86) of the boom (7) through the lower stirrups (83, 84) arranged on either side of the knots (81, 82) of the structure of said arrow (7).   12. Device for mounting tower crane arrows according to claim 4, characterized in that, for mounting the counterflash (8) of a tower crane, this device comprises a rudder (126), the point of which medium (127) serves for hook suspension (68) of an auxiliary assembly machine (69), and two sling systems (129,131,132) fixed to the ends (128) of the spreader (126) and mounted on both sides other of the counterfleche (8), each comprising a rear sling (129) directly connecting the spreader bar (126) to a fixed point (130) of a chord (115) of the counter-flange (8) and a front sling in two parts (131,132) one of which (131) connects the rudder (126) to the tie rod (111) for raising the tie rod (111) and the other (132) connects the tie rod (111) to a fixed point (135) the chord (115) of the counter-flap (8) for lifting the whole of the   counterfleche (8) with its pulling (111) raised. 5 13. Device for mounting tower crane arrows according to any one of claims 4 to   12, characterized in that lights (57, 137) are provided for the broaching of the free ends (56, 122) of the tie rods (13, 111) to the top (106) of the mast head (6), these slots (57, 137) being preferably provided at the free end (56) of the tie rod (13) on the side of the distributing boom (7), and on a connecting rod (136) on the side of the counterfleche (8).