JPS5854118A - Measuring method for load of jack unit for marine working platform - Google Patents

Abstract

PURPOSE:To facilitate measurement of a load of a jack unit, by mounting a load gauge between a jack unit and a jack house through the medium of a buffer material and a spherical seat. CONSTITUTION:Through running of a motor 18 with rake for a jack unit 6 housed in a jack house 2, a pinion 14 is spun in a direction of an arrow mark R through the medium of gears 17 and 16. A leg 3 gearing the pinion 14 through said function is guided by an upper and a lower guide, it projects downward, the forward end of the leg 3 seats the bottom of the sea, and it moves a marine working platform jack house 2 to a higher level. If the motor 8 with brake reverses, the marine working platform jack house 2 is lowered. Then, a load is transferred in a vertical direction by the aid of an upper spherical seat 11 and a lower spherical seat 10 formed on the upper part of the jack unit 6, and this permits the continuous measurement of the load applied to the upper part of the jact 6 through the working of a load gauge 12 and a buffer material 13 located on the under surface of the upper part of the jack house 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load measuring device for a jack-up type offshore work platform jack unit.

The jack-up type offshore work platform elevating device, which has been widely used in the past to carry out various types of work at sea, has a jack-up type offshore work platform lifting device with a jack-up type offshore work platform 2 mounted on the upper deck of the offshore work platform 1, as shown in the overall side sectional view of Figure 1. A leg 3 guided by an upper guide 4 and a lower guide 5 attached thereto passes through the leg.

At this time, the jacking unit 6 is composed of a pinion 14 and a jacking frame 15 incorporating the pinion, and the leg 3
The continuous teeth of the cylindrical member 14 are engaged with the one nion 14.

Therefore, when the jacking unit 6 is operated to send the legs 3 downward and the operation continues even after the leg tips 21 have landed on the seabed 8, the offshore work platform 1, which had been floating above the sea surface 9, will be moved downward.
It will rise higher than sea level 9.

In addition, if the operation is reversed, the landing gear 3 will leave the seabed 8 and the offshore work platform 1 will float above the sea surface 9 again.
When the offshore work platform 1 is fixed at a position higher than the sea level 9,
The entire load of the offshore work platform 1 is applied to the pinion 14.

Here, a shock pad 7 is interposed between the jack frame 15 and the jack house 2 L/c.

Here, as a method of measuring the load applied to the jack house) 6K, as shown in Fig. 2 which is an enlarged view of the main part of Fig. 1, the three-dot chain line attached to the shaft end of the pinion 14 of the jack unit 6 A method is used in which the torque applied to the motor shaft is measured from the shaft end 19 of the electric motor 18 with a brake that drives the gear 17 shown by the two-dot chain line that meshes with the gear 16 shown in , and is converted into a load.

This measurement is difficult because the work is carried out in a narrow space inside the Shatkino-Us 2, and furthermore, all the brake-equipped electric motors 18 have to be measured, so the measurement takes a long time.

In addition, the load applied to the jacking unit 6 varies depending on when the offshore work platform 1 is operated and stopped, uneven loading of oil drilling materials on the work platform 1, the presence or absence of wind and waves, etc.
The drawback was that it was impossible to measure this.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and is to provide a jack unit for easily measuring the load applied to the jack unit in a jack-up type offshore work platform elevating device. The purpose is to provide a load measuring device.

That is, the load measuring device for a jack unit of an offshore work platform of the present invention is a jack unit that is supported by a leg of an offshore work platform via a rack and a pinion, and is installed in a jack house. It is constructed by interposing a load meter between the jack house and a cushioning material and a spherical seat.

An embodiment of the present invention will be described below based on the drawings. The offshore work platform shown in the overall side sectional view of FIG. 3 has almost the same configuration as the conventional example shown in FIG. Although indicated by a number, this offshore workbench 1 corresponds to what is called a ship's hull, which is a loading place for oil drilling materials, etc., and a work place.

First, the jacket house 2 is installed as part of the hull on the upper deck of the offshore work platform 1, and the jacket unit 6 is installed inside it.
The legs 3 are assembled with steel pipes and have continuous rack-shaped gears at both ends, and by lowering these legs 3 to the seabed 8, the offshore work platform 1 is raised. The upper guide 4 and the lower guide 5 are provided for guiding the legs 30.

As shown in the enlarged cross-sectional view of FIG. 4, the jacking unit 6 includes a pinion 14 built into the toss of the jacking frame 15, and a gear 17 that meshes with a gear 16 attached to the shaft end of the pinion 14. It further includes an electric motor 18 with a brake to drive it, and a lower spherical seat 10 and an upper spherical seat 1 are installed at the upper end of the jack unit 6.
1 is provided, and the load cell 12 is provided on the lower surface of the upper part of the jack house 2 together with the buffer material 13.

Next, the jacking unit 6 of the offshore work platform 1 having the above-mentioned configuration will be explained. When the offshore work platform 1 is floating on the sea surface 9, the legs 3 are separated from the seabed 8, and the jack unit 6 of the offshore work platform 1 is Fixed.

The operating process from this state to the state shown in FIG. 3 will be explained with reference to FIG. 4. The gears 17 and 16 are driven by the electric motor 18 with brake of the jack unit 6 housed in the jack house 2. The pinion 14 is rotated in the direction of the arrow through the pinion 14, and as a result of this operation, the leg 3 that is engaged with the second shaft 714 is guided by the upper guide 4 and the lower guide 5 and protrudes downward, and this leg tip 21 is rotated in the direction of the arrow 3. Land on ocean floor 8.

If it continues to be driven after landing, the offshore platform 1 will rise away from the sea level 9, resulting in the state shown in Fig. 3, but on the other hand,
When the electric motor 18 with a brake is driven in the opposite direction to the above, the offshore work platform 1 is lowered and projected upward relative to the legs 111 and 3Fi.

In such a lifting device for the offshore work platform 1, the upper spherical seat 11 and the lower spherical seat 1o provided on the upper part of the jack unit 6, and the load cell 12 provided on the upper and lower surface of the jack house 2.
The load applied to the upper part of the jack unit 6 can be measured by the shock absorbing material 13 and the shock absorbing material 13.

Here, the load measured by the load meter 12 is converted into an electrical signal and displayed in an operation room (not shown).

In addition, since a gap is provided between the upper guide 4 and the lower guide 5 and the leg 3, the leg 3 is in an inclined positional relationship with the jack house 2, and as a result, the jack house 2
and the jacking unit 6 have an inclined relationship.

At this time, the cushioning material 13Fi is provided to allow lateral displacement and vertical deflection, and prevents the load from hitting one side bt-, and the upper spherical seat 11 and the lower spherical seat 10 transmit the load in the vertical direction. It is used for this purpose.

As described above, the load measuring device for a jacking unit of an offshore work platform of the present invention is a device that electrically measures the load by installing a load meter between the upper end of the jacking unit and the lower surface of the top of the jacking house. This method has the advantage of eliminating the work of stopping the jacking units at arbitrary positions, measuring the torque applied to the shaft end of the brake-equipped motor of each jacking unit, and converting it into a load.

In addition, with the conventional model, the jack house NC is closed during operation, when oil drilling materials are loaded on the workbench, and due to the presence or absence of wind and waves.
This load varies and it has been difficult to measure this varying load, but the present invention has the effect of making it possible to continuously measure the load. −

[Brief explanation of the drawing]

Fig. 1 is an overall side sectional view of a conventional jack-up type lifting device for an offshore work platform, Fig. 2 is an enlarged side sectional view of the main part of a jack unit, and Fig. 3 is a side sectional view of a jack-up type lifting device according to an embodiment of the present invention. FIG. 4 is an enlarged side sectional view of the main part of the jack unit shown in FIG. 3. 1... Maritime workbench, 2... Jyatsuki house, 3...
・Leg, 6... Jacket unit, 10... Lower spherical seat, 11... Upper spherical seat, 12... Load cell, 13.
...Buffer material, 14...Pinion. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] In a jacking unit that is supported via a rack and a binion on the legs of an offshore workbench and installed inside a jacking house, a load cell is installed between the jacking unit and the jacking house via a buffer material and a spherical seat. A load measuring device for a jack unit on a offshore work platform, characterized by having an interposed device.