JPH0312814Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention firmly holds the vertical pedestal of an offshore work platform used for offshore oil field drilling, submarine civil engineering work, etc. against external forces such as intense wave force and wind force. This invention relates to a pedestal wedge locking device.

BACKGROUND ART As shown in FIG. 1, a wedge post wedge locking device for an offshore work platform has a plurality of vertical pillars 2 passing through an offshore work platform 1.
A plurality of lock teeth 5 are provided on a vertical rack 3 fixed to a lock body 4 attached to the offshore work platform 1 to engage and wedge the rack 3 to hold and wedge the vertical position of the pedestal 2. On the upper and lower end surfaces 6, 6' of the body 4 are wedge members 9, which slide by fitting into guide rails 8, 8' attached to the support surfaces 7, 7' provided on the offshore work platform 1.
a rail 10 that forms a wedge surface opposite to the wedge insertion surface of 9' and guides the wedge members 9, 9' in the wedge insertion direction;
10', each wedge member 9, 9' is screwed into a nut member 12, 12' which is rotated by an independently operated motor 11, 11', and has a threaded shaft 13 which moves forward and backward in the horizontal direction. , 13', and the nut members 12, 12' are rotatably supported by bearing members 14, 14' attached to the offshore work platform 1.
The wedge angle β of the wedge members 9, 9' is made equal to the pressure angle of the rack 3.

Therefore, a pinion (not shown) provided on the offshore work platform 1 is engaged with the rack 3 of the pedestal 2, and the pedestal 2 is lowered by driving the pinion, and after the bottom end of the pedestal reaches the seabed, the pinion is further driven continuously. Then,
When the offshore work platform 1 rises away from the sea surface and reaches the desired height above the sea surface, the first
The motors 11 and 11' shown in the figure are operated to advance the screw shafts 13 and 13' to the left in the figure, so that the lock teeth 5 of the lock body 4 are engaged with the racks 3 of the pillars, and the offshore work platform 1 is held and wedged on the pillar 2.

If the phases of the rack 3 and the lock teeth 5 do not match, the vertical position of the lock body 4 can be adjusted by moving the screw shafts 13 and 13' back and forth independently. Match the phase with the mesh and engage the wedge.

However, since Rack 3 mentioned in the footnote has extremely large tooth thickness and tooth height, and the tooth profile is formed by fusing, it is extremely difficult to improve the pitch accuracy.

As a result, uneven contact occurs after the rack 3 and the lock teeth 5 engage with each other, and the support load of the offshore work platform 1 is not applied equally to all the teeth, but the load is applied to a specific tooth. In order to securely hold the offshore work platform on the pedestal against external forces such as strong wave force and wind force, the number of lock teeth should be increased more than necessary. This has the disadvantage that stability of work must be ensured.

Problems to be Solved by the Invention The present invention is to form a lock tooth shape by fusing and cutting, and at the same time to prevent the lock teeth from hitting unevenly so that the load does not concentrate on a specific tooth.

Means for Solving the Problems The present invention forms a lock body having lock teeth that are easily engaged with wedges formed on each of a plurality of pillars by laminating and combining a plurality of lock body pieces. This is a pedestal wedge locking device for an offshore work platform in which the lock teeth of the lock body are formed by slightly changing the phase of the lock teeth of the body piece in the vertical direction.

Function In the description of the prior art, the lock body 4 is used to hold and wedge the nuclear offshore platform 1 on the pedestal 2 when the offshore platform 1 reaches a desired height above the sea surface.
Since the lock teeth 5 are meshed into the rack 3 of the pillar, the lock teeth 5 that have entered the mesh wedge do not move to another position on the rack 3 and engage with the rack 3 again.

Therefore, if the lock teeth of the lock body are formed by laminating and combining a plurality of lock teeth formed on a plurality of lock body pieces with slightly different phases in the vertical direction of the pillar, the lock teeth of the lock body The entire tooth surface has an uneven tooth surface in the pitch line direction due to multiple lock teeth with different phases in the vertical direction, and the protruding tooth surface of the lock body piece has a convex portion that easily resists pressing force. Since it is plate-shaped with plastic deformability, when the lock teeth of the lock body are wedged into the irregularly pitched racks by pressing force, the plate-shaped tooth surfaces of the protruding portions of the lock body pieces are wedged into the irregularly pitched locks. It is strongly pressed against the tooth surface and crushed, and is conformed and deformed within the tolerance of fusing and cutting the rack to form a tooth surface that matches the pitch of the rack.

Therefore, among the plate-shaped uneven tooth surfaces formed by laminating and combining the respective lock body pieces, the lock teeth of the lock body have irregularities due to fitting deformation due to the application of pressing force to the easily plastically deformable convex tooth surfaces. Since the tooth surface is formed to match the pitch, even if there is an error in the pitch of the rack during fusing processing, the lock teeth of the lock body will match the pitch of the rack with the error and will not contact the meshing teeth of the rack unevenly. Since the tooth engages with the teeth, there is no risk that the load of the offshore workbench will be concentrated on a particular tooth.

Embodiment FIGS. 2 and 3 show a lock body 4, which is constructed by laminating and combining a plurality of lock body pieces 4a, 4b, 4c, and 4d.
b, 4c and 4d have lock teeth 5a, 5b, 5c
and 5d are formed by fusing or cutting to form the lock teeth 5 of the lock body 4.

The lock tooth 5 is the lock tooth 5 of the lock body piece.
A, 5b, 5c, and 5d are laminated and combined with their respective phases slightly different in the vertical direction to form an uneven tooth surface in the direction of the pitch line of the lock teeth 5 of the lock body 4.

Therefore, the lock teeth 5 of the lock body 4 can accept a plurality of pitches by slight deformation of the lock teeth of the lock body piece when wedged into engagement with the rack 3, so that there is no pitch error due to the fusing process. However, the uneven contact between the rack 3 and the lock teeth 5 is reduced, and a concentrated load is no longer applied to a specific tooth.

Effects of the invention The present invention allows the lock teeth of each lock piece to be attached to the lock teeth of the lock body attached to the offshore work platform when the offshore work platform is held at a desired height and wedged to multiple pedestals. Since we have formed a tooth surface that can absorb the pitch error of the rack through slight deformation, even if the pedestal rack into which the core lock tooth engages and wedges is formed by fusing, the pitch error due to the core fusing will be reduced as described above. Since it can be absorbed by partially deforming the tooth surface of the lock teeth, uneven contact between the lock and lock teeth is suppressed, and support loads can be prevented from being concentrated on specific teeth. It is possible to strengthen the holding wedge of the offshore work platform.

[Brief explanation of the drawing]

Figure 1 is a front view of the main part showing the state in which the lock teeth of the lock body of the offshore work platform are engaged and wedged into the rack of the pedestal, Figure 2 is a front view of the lock body which is part of the present invention, and Figure 3 is a front view of the lock body which is part of the present invention. The figure is a plan view of FIG. 2. 1... Maritime work platform, 2... Pillar, 3... Rack, 4... Lock body, 4a, 4b, 4c, 4d...
...Lock body pieces, 5a, 5b, 5c, 5d...Lock teeth.

Claims (1)

[Scope of utility model registration request] A lock body having a plurality of lock teeth that engages with the racks formed on each of the plurality of pedestals to hold and wedge the elevation position of the offshore work platform is provided on the offshore work platform so as to be able to slide into the wedge. A leg of a marine working platform in which the body is formed by laminating and combining a plurality of lock body pieces, and the lock teeth are formed by tooth surfaces in which the phases of the lock teeth formed on each lock body piece are slightly different from each other. Pillar wedge locking device.