Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
  • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
  • E02B17/06—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for immobilising, e.g. using wedges or clamping rings
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
  • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
  • E02B17/0818—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with racks actuated by pinions
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B2017/0056—Platforms with supporting legs
  • E02B2017/006—Platforms with supporting legs with lattice style supporting legs
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B2017/0056—Platforms with supporting legs
  • E02B2017/0073—Details of sea bottom engaging footing
  • E02B2017/0082—Spudcans, skirts or extended feet

Definitions

• the present invention relates to a complementary leg locking system on a deck of a self-elevating offshore operating platform, as well as to methods of installing such a locking system on the legs of a platform. form of exploitation at sea.
• Offshore platforms of the self-elevating type, such as oil rigs, generally comprise legs, including three in number, resting on the seabed, and a movable mounted bridge and adjustable in height along the legs and including operating equipment and living quarters.
• the entire platform is generally floated to the drilling or operating site, and the legs are lowered into contact with the seabed, and then by resting on the legs, the deck is hoisted above sea level to an altitude that puts it out of reach of the highest waves.
• the bridge is thus movable along the support legs of the bridge by means of drive mechanisms housed in a supporting frame supported by the bridge and well known by specialists under the name of "jack-house".
• each support leg each comprise at least two geared motor sets opposite and driving output gears that cooperate with opposed racks and mounted on the legs.
• each leg passes through the bridge and the supporting framework of these drive mechanisms and is formed by superimposed sections and assembled together by welding.
• Each section is generally constituted by vertical members, three or four, interconnected by a trellis of metal beams or caissons.
• Each chord is formed on the one hand by a rectangular plate and on the other hand by stiffeners each having the shape of a half-shell, each welded to one of the main faces of said plate.
• Each rectangular plate has on its lateral faces, teeth which form diametrically opposed racks, intended to cooperate with the output gears of the drive mechanisms.
• the deck of the platform is maintained in its operating position out of the water by the drive mechanisms and more particularly by the gears of these mechanisms which mesh with the teeth of the racks of the legs of support.
• the object of the invention is to propose a complementary locking system for the legs on a deck of an offshore operating platform which makes it possible to reduce in a simple and significant manner the load applied to the gears of the drive mechanisms of the legs of this platform in its operating position out of the water.
• the object of the invention is therefore a complementary locking system for the legs on a deck of a self-elevating offshore operating platform, the deck carrying drive mechanisms comprising, for each leg, at least two groups. of opposing gears, cooperating with the opposite and leg-mounted racks to move the bridge between a flotation position and an operating position out of the water and to maintain this bridge on the legs in this operating position, characterized in that it comprises, at the level of each leg, at least one set having two opposing counter-racks and each formed by a plate provided with teeth intended to engage with a rack, and on the same side of the plates, at least one internal connecting element of the inner edges of the counter-rack plates and the minus one external connecting element of the outer edges of the counter-rack plates.
• the system comprises means for spacing the two counter-rack plates from each other at the time of placing the assembly on the racks of the corresponding leg; the system comprises means for separating the two counter-rack plates of each other at the time of installation of the assembly on the racks of the corresponding leg and bringing these two counter-rack plates closer to one another after the installation of the together,
• the system comprises means for bringing the two counter-rack plates closer to one another after the assembly is placed on the racks of the corresponding leg,
• the system comprises means for holding the two counter-rack plates in the tightened position after the assembly has been fitted, and each counter-rack plate is carried by a support plate and at least one counter-rack plate is movable on its plate; support by at least one moving means between an open position of placing the assembly on the racks of the corresponding leg and a closed locking position of the counter-racks plates on the racks of said leg after the installation of the together.
• the subject of the invention is a method of installing a locking system, characterized in that it consists of the following steps:
• the invention also relates to a method of installing a locking system, characterized in that it consists of the following steps:
• the invention also relates to a method for installing a locking system, characterized in that it consists of the following steps:
• the invention also relates to a method of installing a locking system, characterized in that it consists of the following steps:
• said at least mobile rack-plate is in the open position, - to mount the two counter-rack plates on the racks of the corresponding leg,
• a subject of the invention is a method of installing a locking system, characterized in that it consists of:
• FIG. 1 is a diagrammatic elevational view of an offshore operating platform in a floating position
• FIG. 2 is a schematic view on a larger scale and partially cut away of one of the legs of the platform showing a part drive mechanisms and a complementary locking system of the legs on the bridge, according to the invention
• FIG. 3 is a sectional view along the line 3-3 of FIG. 2
• FIG. 4 is a schematic perspective view of a first embodiment of an assembly of the complementary locking system according to the invention.
• FIG. 5 and 6 are schematic top views of the assembly of FIG. 4 showing the steps of placing this assembly on a leg of the platform
• FIG. 7 is a schematic view from above of a second embodiment of an assembly of the complementary locking system according to the invention.
• FIG. 7 - Figs. 8 and 9 are schematic top views of the assembly of FIG. 7 showing the steps of placing this set on one leg of the platform,
• FIG. 10 is a schematic view from above of a third embodiment of an assembly of the complementary locking system, according to the invention.
• FIG. 11 is a schematic perspective view of a fourth embodiment of an assembly of the complementary locking system, according to the invention.
• FIG. 12 is a schematic perspective view of a fifth embodiment of an assembly of the complementary locking system according to the invention.
• FIG. 13 is a schematic perspective view of another embodiment of an assembly of the complementary locking system, according to the invention.
• FIG. 14 is a schematic perspective view of the entire complementary locking system of FIG. 13 with a removable counter rack plate removed
• FIG. 15 is a schematic elevational view of an assembly of the complementary locking system in vertical section along the line 15-15 of FIG. 16
• FIG. 16 is a schematic cross-sectional view along line 17-17 of FIG. 15, and
• FIG. 17A and 17B are schematic sectional views showing the position of an eccentric of a moving means, respectively in the open position and in the closed position of the movable counter-rack plate.
• FIG. 1 there is shown schematically an offshore operating platform, including self-elevating, comprising a bridge 1 provided, in conventional manner, operating equipment and usual living quarters.
• the bridge 1 is movably mounted on vertical legs 2 which each have for example a triangular section. These legs 2 may also have a square or circular section. They can be three or four, evenly distributed on deck 1.
• This bridge 1 is movably mounted on the vertical legs 2 intended to bear on the seabed 3 via a foot 4 when the platform is in the drilling or operating position.
• each leg 2 is formed of three parallel members 5 interconnected by a lattice of metal beams 6 or boxes.
• each supporting frame 7 is supported by the bridge 1, as shown in Figs. 1 and 2.
• at least two members 5 of each leg 2 are each formed on the one hand by a rectangular plate 8a and on the other hand by stiffeners 8b each having the shape of a half shell and which are concerned on one of the main faces of said plate 8a.
• Each rectangular plate has on its lateral faces, teeth 9 which form racks 10 diametrically opposed.
• Each drive mechanism 20 for the displacement of the bridge 1 on the legs 2 is conventionally formed by geared motor assemblies 21 each driving an output gear 22 meshing with the teeth 9 of a rack 10 of the frame 5. a corresponding leg 2.
• the platform is brought to the drilling or floating site of the bridge 1 and the legs 2 are lowered to the contact with the seabed 3.
• the bridge 1 is raised by means of the pinions 22 driven in rotation each by a corresponding geared motor 21 of the drive mechanisms 20 and which mesh with the teeth 9 of a rack 10.
• the bridge 1 of the platform is thus raised to the desired height to allow operation.
• each leg 2 is equipped, at the bridge 1, with a complementary locking system of these legs 2 on the bridge 1.
• the complementary locking system consists of at least one assembly designated by the general reference 30 which comprises two opposing counter-racks 31 and each formed by a plate 32 of generally rectangular shape.
• the plates 32 form between them a space 33 for the positioning of the assembly 30 on the racks 10 of a frame 5 of a leg 2, as will be seen later.
• edges opposite the two plates 32 are provided with a series of teeth 34 of complementary shape to the teeth 9 of the racks 10.
• the assembly 30 also comprises, on the same side of the plates 32, at least one internal element 40 connecting the inner edges 32a of the plates 32 and at least one external element 45 for connecting the outer edges 32b of said plates 32.
• the inner element 40 is formed of several parallel stiffeners 41, uniformly distributed over the length of the plates 32 and forming between them a gap 42.
• Each stiffener 41 of the inner element 40 of connection has the shape of a half -ellipse.
• the external connecting element 45 is also formed of several parallel stiffeners 46, uniformly distributed over the length of the plates 32 and leaving a gap 47 between them.
• the stiffeners 46 of the outer element 45 are preferably located at the same level. that the stiffeners 41 of the inner member 40.
• each stiffener 46 of the outer connecting element 45 comprises a rectilinear central portion 46a extending parallel to the plates 32 and two lateral portions 46b each connecting one end of the rectilinear portion 46a to an outer edge 32b of a plate 32.
• the assembly 30 comprises at least one intermediate member for connecting the inner element 40 with the external element 46.
• said at least intermediate connecting member is formed, at each set of stiffeners 41 and 46, by two spacers 50 extending between a stiffener 41 and a curved portion 46b of a stiffener 46.
• an assembly 30 is placed at the level of the bridge 1 and close to the frame 5 by placing the plate 8a of the frame 5 opposite the space 33 formed between the plates 32 of the counter-racks 31.
• the two counter-racks 31 are moved away from each other so as to increase the width of the gap 33, as shown in FIG. 5.
• the system is equipped with means for spacing the two plates 32 from each other and which, for this embodiment, consists of by at least one heating source, not shown, applied to at least the stiffeners 41 of the inner member 40.
• the heating source can be applied simultaneously to the stiffeners 41 of the inner member 40 and the stiffeners 46 of the outer member 45.
• This heating source is constituted for example by a torch or by electrical resistors or by any other suitable sources.
• the shape of the stiffeners 41 and 46 is determined to facilitate the spacing of the counter-racks 31 from each other during the heating phase whose temperature is of the order 120 ° C. In FIG. 5, the deformation of the assembly 30 by heating has been deliberately exaggerated to facilitate understanding.
• increasing the width of the space 33 between the teeth 34 of the plates 32 is of the order of 2 to 6 mm.
• the spacers 50 avoid a possible buckling of the assembly 30 when spacing the counter-racks 31. As soon as these counter-racks 31 are sufficiently spaced apart, as shown in FIG. 5, the assembly 30 is moved to bring the teeth 34 of these counter-racks 32 into the teeth 9 of the rack 10 of the frame 5.
• the assembly 30 is allowed to cool so that the width of the space 33 between the teeth 34 of the counter-racks 31 is reduced and these teeth 34 are applied to the teeth 9 of the rack 10 thus causing the blocking of the assembly 30 on the corresponding frame 5.
• At least one assembly 30 is mounted on the rack 10 of each frame 3 and each assembly 30 is wedged, for example, by means of wedges 15 which are arranged between the assembly 30 and an element 1a of the structure of the bridge 1 so as to block each assembly 30 with this bridge 1.
• the system comprises spacing means of the two plates 32 of the counter-racks 31 of each other at the time of installation of the assembly 30 on the racks 10 of a chord 5 of the leg 2 corresponding and approximation of these two plates 32 towards each other after the installation of this assembly 30.
• each stiffener 46 of the outer member 45 has substantially in the middle of the straight portion 46a, a free space 51 directed towards the inner member 40.
• This free space has, for example, the shape of a corner and is intended to receive means for holding the plates 32 in a tight position.
• the system comprises spacing means of the two plates 32 of the counter-racks 31 of each other at the time of installation of the assembly 30 on the racks 10 of a frame 5 of the corresponding leg 2 and bringing these two plates 32 closer to each other after the installation of this assembly 30.
• These means are formed by at least one mechanical device generally designated by the reference 55.
• the mechanical device 55 consists of a first threaded rod
• the mechanical device 55 also comprises a second threaded rod 57, one of which first end 57a is screwed into the threaded sleeve 58 and a second end 57b is hingedly mounted on a soleplate 59 fixed, for example by welding, on the stiffeners 46.
• the sleeve 55 and the threaded rods 56 and 57 extend parallel to the plates 32 of the counter-racks 31.
• the assembly 30 as shown in Figs. 7 to 9 is mounted on a rack 10 of a frame 5 of a leg 2 as follows.
• At least one assembly 30 is placed at the level of the bridge 1 and near a frame 5 of a leg 2. Then, the sleeve 58 is rotated in a determined direction to cause the screwing threaded rods 56 and 57 in the sleeve 58 which causes, through the stiffeners 46 which deform, an increase in the width of the space
• the two counter-racks 31 are mounted on the racks 10 of the frame 5 in such a way that the teeth 34 of these counter-racks mesh with the teeth 9 of the racks 10.
• the sleeve 58 is rotated in the opposite direction, thus causing the translation of the threaded rods 56 and 57 in the opposite direction, that is to say in a direction causing a reduction in the width of the space 33 and, as a result, a clamping of the counter-racks 31 on the racks 10 of the chord 5.
• At least one wedge-shaped wedge 52 is inserted into the housing 51 formed in the stiffeners 46, as shown in FIG. 9. After assembly, the shim 52 can be welded to the edges of the housing 51.
• Other mechanical devices 55 may be provided to separate the counter-racks 31, such as one or more hydraulic or pneumatic cylinders or any other suitable system.
• the mechanical device 55 may be constituted as shown in FIG. 10, by at least one metal rod 60 comprising a first end 60a articulated on a soleplate 59 fixed, for example by welding, on the stiffeners 46, and a second end 60b articulated on a soleplate 59 fixed, for example by welding, on the stiffeners 46.
• the metal rod 60 is heated by appropriate means which causes by the expansion of this rod 60, the bringing together of the counter-racks 31 and the clamping of these counter-racks 31 on the racks 10 of the frame 5.
• the assembly 30 is held in this clamping position by the introduction of at least one wedge 52 wedge-shaped in the housing 51 formed in the stiffeners 46 as shown in FIG. 10.
• the shim 52 can be welded to the edges of the housing 51.
• FIG. 11 there is shown another embodiment of the assembly 30 which differs from other embodiments in particular by the shape of the outer member 45 connecting the counter-racks 31.
• the external connecting element 45 also consists of stiffeners 65 between them a gap 66.
• Each stiffener 65 of the external connecting element 45 is formed by a straight central portion 65a extending parallel to the plates 32 of the counter-racks 31 and by two lateral portions 65b each connecting one end of the central portion 65a to an outer edge 32b of a plate 32.
• Each spacer 50 extends between a stiffener 41 of the inner element 40 connecting and the wedge formed between the straight portions 65a and 65b.
• the shape of the stiffeners 41 and 65 contributes to exerting a force of separation of the counter-racks 31 relative to each other during the heating of at least the stiffeners 41 of the inner member 40 link.
• the mechanical devices for spacing the counter-racks 31 can also be mounted on the stiffeners 65 of this embodiment.
• the assembly 30 comprises, between each pair of stiffeners 41 and 46 and each spacer 50, an intermediate plate 70 extending perpendicularly to these stiffeners 41 and 46 and to these spacers 50.
• These horizontal plates 70 contribute to the diffusion of heat towards the stiffeners 46 of the external element 45 during the heating of the stiffeners 41 of the inner element 40.
• these horizontal plates 70 make it possible to improve, in addition to the stiffeners 41 and 46, the holding of the assembly 30 on the racks 10. Indeed, the weight of the bridge 1 of the platform creates, which is called by the specialists a thrust of teeth, which tends to spread the counter-rack 31 racks 10. This phenomenon is limited by the horizontal plates 70.
• the assembly 30 of each embodiment previously described may be associated with each of the spacing means mentioned and may or may not be equipped with horizontal plates 70.
• the stiffeners 46 may or may not be provided with a housing 51 for the positioning of at least one shim 52 and may be formed of a central portion 46a and two curved portions 46b or only of rectilinear portions 65a and 65b.
• the various parts making up the assembly 30 are interconnected, for example by welding or by any other appropriate means. Without departing from the scope of the invention, several sets 30 may be mounted one above the other on a rack 10 of a frame 5 of a leg 2.
• the assembly or assemblies 30 are, after mounting on a rack 10, biased relative to the bridge 1 so that the assemblies 30 partially support the bridge 1 so as to relieve the gears 22 of the drive mechanisms. 20.
• the complementary locking system consists of at least one assembly designated by the general reference 30 and which comprises two plates 31 each forming a counter-rack, opposite and of generally rectangular shape.
• the counter-rack plates 31 form between them a space 33 for the positioning of the assembly 30 on the racks 10 of a frame 5 of a leg 2, as will be seen later.
• the edges facing the two counter-rack plates 31 are provided with a series of teeth 34 of complementary shape to the teeth 9 of the racks 10.
• Each counter-rack plate 31 is carried by at least one support plate designated by the general reference 35.
• each support plate 35 consists of a plurality of independent support plates 35a, forming between them an interval 35b.
• each support plate 35 is formed of four support plates 35a, the number of support plates 35a may be smaller or larger.
• the assembly 30 also comprises, on the same side of the support plates 35, at least one internal element 40 for connecting the inner edges 36a of the plates 35 and at least one external element 45 for connecting the outer edges 36b of said plates 35.
• the inner element 40 is formed of several stiffeners 41 parallel and distributed along the length of the counter-rack plates 31 and leaving between them a gap 42.
• Each stiffener 41 of the inner element 40 of connection has a curvilinear shape and for example the shape of a half-ellipse.
• the external connecting element 45 is also formed of several parallel stiffeners 46, distributed along the length of the counter-rack plates 31 and forming between them a gap 47.
• the stiffeners 46 of the outer member 45 are preferably located at same level as the stiffeners 41 of the inner member 40.
• each support plate 35a of the support plate 35 is associated with a pair of stiffeners, respectively 41 and 46.
• Each stiffener 46 of the outer member 45 comprises a central portion 46a that can be rectilinear and two lateral portions 46b extending a portion 46a to an outer edge 36b of a support plate 35a of a support plate 35.
• the assembly 30 also comprises at least one intermediate connecting member of the inner member 40 with the outer member 45 and which, in the embodiment shown in Figs. 13 to 16, is formed, between each pair of stiffeners 41 and 46, by an intermediate plate 49 extending perpendicularly to these stiffeners 41 and 46.
• At least one counter-rack plate 31 is movable on its corresponding support plate 35 by at least one moving means 60 between an open position of placing the assembly 30 on the racks 10 of the leg 2 and a closed locking position of the counter-rack plates 31 on the racks 10 of said leg 2 after the installation of this assembly 30.
• each moving means 60 is identical to that described below.
• Each displacement means 60 comprises a cylindrical pin 61 extending perpendicularly to the corresponding support plate 35 on its face opposite that provided with the stiffeners 41 and 46, and an eccentric 62 mounted on said pin 61.
• the eccentric 61 is disposed in an orifice 63 formed in the movable counter-rack plate 31.
• the axis BB of the eccentric 62 is offset relative to the axis AA of the pin 61.
• a clearance J is provided between the outer surface of the eccentric 62 and the inner surface of the orifice 63 for the displacement means 60 located above the lower moving means 60.
• the clearance J is greater on the eccentrics 62 of the displacement means 60 situated between the displacement means 60, respectively the lowest and the highest, in order to allow the angular displacement of the movable counter-rack plate 31, as it is will see later.
• no play in addition to the functional clearance is provided between the eccentric 62 and the orifice 63 of the lower displacement means 60 situated on the movable counter-rack plate 31.
• some moving means 60 have a clearance J greater than the others.
• the displacement means 60 having no clearance, in addition to the functional clearance, and called the main displacement means, are driven first while the displacement means 60 having a predetermined clearance in addition to the functional clearance and called secondary displacement means are driven after these main displacement means so as to obtain a lateral displacement of the movable counter-rack plate 31 during the clamping of said main displacement means.
• each displacement means 60 is locked in translation by a plug 64 screwed onto the free end 61a of the pin 61 which has a thread on which is screwed said plug 64.
• each displacement means 60 has an end 66 projecting from the counter-rack plate 31 and intended to cooperate with a rotational drive member of said eccentric 62.
• the end 66 of each eccentric 62 is formed by a hexagonal head intended to cooperate with the drive member in rotation of the eccentric 62 formed for example by a hydraulic key of known type or by any other means having an element at the end 66.
• the eccentric 62 of each drive means 60 is provided with a shoulder 67 resting on the counter-rack plate 31 movable so as to maintain this counter-rack plate 31 on the support plates 35a of the corresponding support plate 35.
• the assembly 30 comprises at least one blocking means of the counter-rack plate 31 movable on its support plate 35 in the closed position of locking of the counter-rack plates 31 on the racks 10 of the corresponding leg 2.
• the assembly 30 comprises as many locking means of the counter-rack plate 31 movable as moving means 60 of the movable counter-rack plate 31.
• each locking means designated by the general reference 70 consists of a first toothing 71 formed at the periphery of the shoulder 67 of the eccentric 62.
• This first toothing 71 is intended to cooperate with a second toothing 72 formed in an orifice 73 of a ring 74 movable, thanks to the teeth respectively 71 and 72, in rotation during the rotation of the eccentric 62.
• This ring 74 has for example an oblong shape.
• the ring 74 is provided with a stud 75 intended to be introduced into an orifice 76 of a series of orifices 76 formed in the movable counter-rack plate 31 (FIGS 13 and 16).
• the orifices 76 are distributed in an arc of a circle relative to the axis of rotation of the ring 74 and they are distributed so as to correspond to a clamping position of the movable counter-rack plate 31.
• the assembly of the assembly 30 as shown in Figs. 13 to 16, 17A and 17B is implemented as follows. Firstly, at least one assembly 30 is placed at the level of the bridge 1 and near a frame 5 of a leg 2.
• the movable counter-rack plate 31 is in the open position so that the width of the space 33 makes it possible to place the teeth 34 of the counter-rack plates 31 on the teeth 9 of the chord 5 of the corresponding leg 2.
• the two counter-rack plates 31 of an assembly 30 are mounted on the racks 10 of the frame 5 so that the teeth 34 of these counter-rack plates 31 mesh with the teeth 9 of the racks 10.
• this assembly 30 is mounted on the drive head 66 of the eccentric 62 of one of the main moving means 60 a device for rotating the head 66 to rotate the corresponding eccentric 62 to move the movable rack plate 31.
• the same operation is performed on the other of said main displacement means 60 to laterally move the movable counter-rack plate 31.
• the eccentrics 62 of the main displacement means 60 can be driven simultaneously. In Figs.
• one of the main displacement means 60 comprises, between the eccentric 62 and the orifice 63, a greater clearance than the clearance between the eccentric 62 and the orifice 63 of the other main movement means 60, but less important than the set of secondary displacement means 60.
• the secondary displacement means 60 always have greater play than the larger set of the main displacement means 60.
• the eccentrics 62 are driven in rotation by the secondary displacement means 60 to complete the clamping of the two counter-rack plates 31 on the racks 10 of the chord 5 of the corresponding leg 2. If necessary, after having done this tightening, a new complementary tightening is carried out by rotating the eccentrics 62 of the main and / or secondary displacement means 60.
• each eccentric 62 the ring 64 of each displacement means 60 is rotated by means of the toothing 71 and 72 formed respectively on the shoulder 67 of the eccentric 62 and in the orifice 73 of said ring 74.
• Each ring 74 is locked on the movable counter-rack plate in the closed locking position of this movable counter-rack plate 31 by placing a pin 75 in an orifice 76, as shown in FIG. 16.
• the movable counter-rack plate 31 comprises a single displacement means 60
• the horizontal plates 49 arranged between each pair of stiffeners 41 and 46 make it possible to improve in addition to these stiffeners 41 and 46, the holding of the assembly 30 on the racks 10. Indeed, the weight of the bridge 1 of the platform form creates, what is called by the specialists a thrust of teeth, which tends to spread the rack plates 31 of the racks 10. This phenomenon is limited by the horizontal plates 49.
• the assembly or assemblies 30 may be mounted on top of one another on a rack 10 of a frame 5 of a leg 2.
• the assembly or assemblies 30 are after mounting on a rack 10, pressed relative to the bridge 1 so that the assemblies 30 partially support the bridge 1 so as to relieve the pinions 22 of the drive mechanisms 20.
• the two counter-rack plates can be movable.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Transmission Devices (AREA)
• Bridges Or Land Bridges (AREA)
• Mutual Connection Of Rods And Tubes (AREA)
• Ship Loading And Unloading (AREA)
• Earth Drilling (AREA)

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• 2006
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