JPS6018767B2 - Load control device for legs of automatic lifting platform - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load control device for an automatic tin-plated platform, wherein the platform includes a plurality of movable parts having drive pinions in gear with racks fixed to legs, and the movable parts each having at least one upper support structure and at least one lower support structure, said upper support structure being configured to support when said platform is lifted onto the water with its legs resting on the bottom of the water. Abutting a crossbar fixed to the platform, the lower support structure abuts the platform to maintain the lifted chest as the platform floats on the water.

It is known that the hardness of the soil at the bottom of the legs is a problem with this type of platform used for submarine boring.

It is therefore known to apply a heavy load, called a preload, to each of the chests in order to ensure that the soil is sufficiently bearable during platform installation. The simplest way to apply this preload is to use moving parts to slightly lift some of the legs while relieving the stress on these legs, thereby transferring the load to the other legs.

In this case it is necessary to be able to measure the load on each leg.

Similarly, it is advantageous to maintain the same load on the various legs during the mining period, and load adjustments may here also be made by lowering the moving parts of overloaded legs.

However, it is necessary to be able to constantly measure the loads on the various legs. The document French Patent Application No. 2312603 is known which discloses a platform of this type arranged between the upper surface of the movable part and said crossbar associated with a jack whose body is fixed to the crossbar. be.

In this platform, the crossbar is fatigued where it has to function, and moreover, the stress on these jacks is due to the elastic deformation of the crossbar and the structural tolerances between the legs and the leg guides. The effect of the gap is very large.

The load measuring device for the legs of a self-lifting platform according to the invention does not have the above-mentioned drawbacks and is housed in storage means guided by guide means between each upper support structure and the associated crossbar. a hydraulic cushion, said storage means and guiding means being fixed on the one hand to the crossbar and on the other hand to said upper support structure and allowing the legs to assume a slightly inclined position with respect to the platform; Hydraulic cushions combined with all upper support structures of all moving parts of any leg are arranged to characterized in that it is connected to means for displaying a magnitude representative of the load of the leg under consideration, which is sensitive to the load of the leg under consideration.

The identical chest hydraulic cushion and the cushion storage means associated with the guide means are very easily accommodated between the hoist mechanism and the crossbar without requiring major modification of the crossbar.

Furthermore, the cushion and its storage means provide this joint with the function of a ball-and-socket joint that allows the leg to tilt slightly with respect to the platform. The pressure sensitive means may be a manometer calibrated in units of load.

When the amount of fluid inside the cushion is constant, the contact area between the cushion and the crossbar is practically unrelated to changes in load.

As a result, the load changes approximately linearly with pressure, and the manometer can then be a conventional manometer with a linear scale. On the contrary, when the cushion is connected to a pneumatic accumulator, the load no longer varies linearly with respect to pressure, but the pressure result can be converted to units of load or the manometer can be changed non-linearly in units of load. or the detected magnitude must be varied along the pressure/load curve so that it is possible to read the load continuously on a linearly graduated scale plate. , this change curve can be determined experimentally.

The invention will be better understood by the following explanation.
The figure shows a top view of the barge-type platform.

The platform 1 has four cylindrical legs 2 which are movable vertically with respect to the platform.

A crossbar 3 is arranged on both sides of each leg 2. FIG. 2 shows a leg with two moving parts.

The legs 2 have two T-shaped double racks 4 fixed to each leg.
Each rack 4 is combined with a movable part 5.

A side view of the movable part 5 is shown in FIG.

This movable part 5 has a drive pinion 6 which cooperates with each element 7 of the double rack 4.

At the top of the movable part 5 are arranged two elastic cushions 8 made of laminar steel-rubber, each terminating in an upper support structure 9.

The movable part is provided with two lower support surfaces 10 which can be supported on shoes 10' fixed to the platform 1 at its lower part.

The crossbar 3 associated with each movable part 5 has the shape of a portal frame whose bottom part is fixed to the platform 1.

A hydraulic cushion is arranged between each upper support structure 9 and the crossbar 3.

Therefore, there are four cushions per leg. The surroundings of this cushion are shown in more detail in FIGS. 4 and 5, and FIG. 4 is shown in more detail in FIG.
Figure 4 shows the vertical section W-N of Figure 5;
The horizontal section VV of the figure is shown.

The cushion 11 is arranged in a protective case 12 fixed to the upper support structure 9.

The guide stopper 13 fixed to the crossbar 3 is connected to the case 12
surrounds the sides with some play. case 12
has a hole in its bottom, through which a steerable hydraulic connection 14 with a cushion passes.

The hydraulic cushion itself will not be described in further detail, but may in particular be of the type described in the document French Patent Application (FR-A) 2305, No. 1. FIG. 6 represents the hydraulic connections of the device of the invention for a single leg.

The cushions 11 are connected in pairs by a pipe 15 with two valves 16, each of which is associated with one cushion.

The two pipes 15 connecting two cushions each are
They are connected to each other by a conduit 17 with two valves 18, each of which is associated with a pair of cushions 11. The pipe line 17 is connected to the manometer 2 via a valve 19.
A source of pressurized fluid (not shown) is connected via valve 21 to valve 22.
It is connected to the pneumatic accumulator 23 via.

The functions of the device of the present invention are as follows.

When the platform is oscillated into its working position, the cushions 11 are inflated with relatively low pressure (for example 10 bar per square kite cushion).

However, this is the case if this expansion has not been done beforehand. Lower all legs while loosening pinion 6.

When the leg portion touches the bottom of the water, the pinion 6 is driven to rotate so as to raise the movable portion 5 again. Initially, the elasticity of members 8 and 11 causes the support structure to move away from shoe 10', so that the platform rises relative to the legs. Once the platform reaches sufficient height, lock the pinion in place.

Next, each leg is preloaded by applying, for example, twice the standard load to the leg under consideration while lowering the movable parts of the other legs.

The manometer 20 is calibrated in tons, allowing a direct reading of the load. When this operation is completed, the movable part is adjusted to a predetermined position so that the load is the same on each chest.

This adjustment is repeated each time a change in load is detected by the manometer. When the device includes a pneumatic accumulator 23, which makes it possible to dampen the impact on each leg (valve 22 is open), changes in pressure can be detected using the manometer 20. This pressure change can then be converted into a load change by having a pneumatic accumulator dependent and experimentally verified pressure load change curve. Of course, the face of the manometer could be directly graduated in tons, and if it were desired that this scale be linear, the signal detected as changing with respect to the pressure load curve could be varied, and the measurement Values can also be transmitted and displayed. It is also possible to use the valve 19 in a slightly open state in order to stop vibrations that affect the manometer. If it is desired to change the characteristics of the accumulator 23, valves 18 and 19 are closed and valves 21 and 22 are opened so that the desired amount of fluid can enter the accumulator.

During the measurement, valves 16 and 18 are always open, but if a cushion leaks, the corresponding valve 16 is closed and the manometer 20 then indicates the average pressure of the three remaining cushions.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a barge-type platform having legs that enable the application of the device of the present invention, Fig. 2 is an explanatory diagram showing the legs of the platform in Fig. 1 together with its movable parts, and Fig. 3 is an explanatory diagram of the device of the present invention. 2 is a side view of the movable part shown in FIG. 2, FIG. 4 is an enlarged explanatory view of a vertical cross section of a mechanism surrounding the hydraulic cushion belonging to the movable part in FIG. 3, and FIG. 5 is the same mechanism shown in FIG. 4. 6 shows a hydraulic flow sheet of the control device according to the invention. 1...Platform, 2...Legs, 3...Crossbar,
4...Rack, 5...Movable part, 6...
... Drive pinion, 9 ... Upper support structure, 11 ... Hydraulic cushion, 12 ... Storage means, 13 ... Guide means 20 ...・...Manometer (display means). FIG.1FIG.2 FIG.3 FIG.5 FIG.6

Claims (1)

[Claims] 1 A load control device for a leg of a self-lifting platform, wherein the platform includes a plurality of movable parts having drive pinions meshing with racks fixed to the legs, and at least one of the movable parts The platform has two upper support structures, and the upper support structure is an abutting body for a crossbar fixed to the platform when the legs are placed on the bottom of the water and the platform is lifted above the water. , the apparatus includes a hydraulic cushion housed in a storage means guided by guide means between each upper support structure and the associated crossbar, one of the storage means and the guide means to the crossbars, the other being fixed to said upper support structure and arranged in such a way as to enable the legs to assume a slightly inclined position with respect to the platform, and all movable parts of any leg; All the hydraulic cushions associated with all the upper support structures of , on the one hand, are connected to each other and, on the other hand, are sensitive to the pressure of the fluid inside the cushions, representing the loads of the legs under consideration. A load control device for a leg of a self-lifting platform, characterized in that the device is connected to means for controlling the load on a leg of a self-lifting platform.