JPS6153910A - Securing device for jack-up rig - Google Patents

Abstract

PURPOSE:To reliably secure a hull to a leg, by a method wherein a frame incorporating an outer frame is secured to the hull, an inner frame, being slidable over the outer frame, is located, and a stopper having a rack engaged with the rack attached to a cord is provided. CONSTITUTION:When a hull is stopped in a position allowing the forward end of the tooth of a rack 6 attached to a cord 3 to be located facing the forward end of the tooth of a rack 11a, stopper valves B, C, D and E are opened, and a stopper valve A is closed. A pump P is driven forward or reversely in a direction in which the stopper 11 is moved either upward or downward, and the forward end of the tooth of the rack is moved in a position allowing the forward end of the tooth of the rack 11a to be prevented from facing the forward end of the tooth of the rack 6. After the stop valve A is opened and the stopper 11 is pushed in so that it is engaged with the rack 6, the stop valves A-G are closed to secure the stopper 11 by blocking cylinders 13 and 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fixing device for a jack up rig mainly used for offshore oil exploration.

[Prior art]

The jack-up unit used in the conventional jack-up rig has leg 2 grounded on the seabed B and hull 1 protected from the influence of waves, as shown in the plan view of Fig. 5 and the side view of Fig. 6. Perform various tasks by jumping up to a certain height above sea level W to avoid being exposed to water.

This varies depending on the purpose of the operation, such as an oil drilling rig, a maintenance barge, or a production purge, but the structure is the same.

However, under the above conditions, a large external force acts on the jack-up rig due to the effects of typhoons, waves, etc., and that force also acts on the jack-up unit.

Jacket amplifier units are designed with normal load and survival load in mind, but jackup rigs used in the North Sea, especially in the deep sea, have a large gap between normal load and survival load. If a Tsuki-up unit is designed to fit a survival load, it will be extremely expensive.

Therefore, it is economically preferable to use a jack-up unit designed for normal loads, and to use a cheaper fixing device for survival loads.

Here, the conventional jack up rig will be explained with reference to FIGS. 5 and 6. A plurality of legs 2 provided on a nozzle 1 descend and land on the seabed B, and then move the hull 1 to the sea surface. W
Work is carried out by jacking up the hull to a predetermined height, and the leg 2 used to support the hull 1 is
is constructed by connecting and reinforcing a set of three cords 6 (some have a set of four cords) with cross beams 4 and diagonal beams 5 at multiple locations above and below.

Each cord 6 is provided with a double-toothed rack 6 extending in the axial direction, and a pinion 7 that engages with this rack 6 to raise and lower the cord 3 is provided for each rack 6 as part of a jack-up unit. Note that the hull 1 is provided with a guide member that guides the cord 3 so that it can move up and down.

In the jack-up unit having such a configuration, as a technique for fixing the position of the hull 1 with respect to the leg 2, for example, a support leg support device for a workbench device was devised in Japanese Utility Model Publication No. 59-10186. The device faces the rack, adjusts the stopper vertically and horizontally, presses the stopper against the trough of the rack, and then fixes the workbench to the support legs with wedges.

By the way, leg 2 is guided by a guide member provided on hull 1 and moves up and down in the vertical direction, but the sliding part between the guide member and leg 2 absorbs dimensional changes due to external temperature changes and mutual manufacturing dimensional errors. In order to do this, a certain gap is always provided in any rig, so it is customary for leg 2 to stand tilted about 3 degrees in either direction within the gap between it and the guide member. However, in such a case, the stopper cannot be reliably fitted into the trough of the rack with the conventional structure described above.

In other words, if there is an inclination in the relationship between the rack and the stopper,
There is a problem that the stopper becomes in a state of local light breakage and stops midway, and the part of the local light breakage becomes overloaded, leading to damage.

In recent years, jack up rigs have been used in harsh sea conditions such as the North Sea and in deep seas, and the difference between normal and survival loads has widened, resulting in cheaper and more reliable fixed up rigs. Demand for equipment will continue to grow stronger in the future.

[Purpose of the invention]

Therefore, the present invention solves the above-mentioned conventional problems, can accurately mesh with the tilted leg within the allowable range of the rack guide, and can follow the movement of the leg.Furthermore, even when the survival load is The object of the present invention is to provide an inexpensive fixing device for a jack-up rig that does not apply shock loads and can operate more reliably against survival loads.

[Structure of the invention]

Particularly, the fixing device for the jack up rig of the present invention includes a rack provided on the cord of the leg that passes through the hull in the vertical direction, and a pinion in the jack up unit that meshes with the rack provided in the knoll. In the type jack up rig, a frame containing two opposing U-shaped outer frames is fixed to the hull via a shock pad, and the inside of each outer frame is attached to a cylinder. A stopper having inner frames that are horizontally slidable, and further provided with racks that are vertically slidable by cylinders along the inner frames and that mesh with racks provided on the cord. It is configured by providing .

〔Example〕

Hereinafter, a fixing device for a jack-up device according to an embodiment of the present invention will be explained with reference to the drawings. First, FIG. 1 is a plan view of the fixing device in a partially broken state, and FIG.
3 is a front view of the figure, and FIG. 3 is a partially cutaway side view of FIG. 2.

The fixing device shown in this example is a fixing device installed in a jack up rig having almost the same structure and function as shown in FIGS. 5 and 6, except that 8 is a frame, and The frame 8 has two U-shaped outer frames 8a facing each other, and is fixed to the hull 1 in FIG. 6 via shock pads 15 at the top and bottom.

Next, an inner frame 9 is provided inside each outer frame 8a, and the inner frame 9 is slidably supported on the upper and lower sides inside the outer frame 8a. A stopper 11 is provided that moves beyond the dimension of one pitch of the rack B.

A cylinder 10 is provided on the outer frame 8a, and the tip of the cylinder 10 is attached to the inner frame 9 with a pin 12.
can be slid horizontally.

Further, the cylinder 13 is provided above and below the inner frame 9, and the tip of the cylinder is fixed to the stopper 11 with a pin 14. A rack 11a is provided which is formed to exactly mesh with the valleys of the teeth.

The stopper 11 is a double-toothed rack 6 provided on the cord B.
Therefore, the external force applied to the hull 1 and leg 2 on the tooth surface of rack B, and also to the jack-up rig depending on sea conditions, is divided into horizontal and vertical components. Stopper 11 by horizontal force
However, since there is only one frame 8 and a U-shaped outer frame 8a is provided opposite the frame 8, the frame 8 absorbs the horizontal force and transfers the force to the outside. Since no transmission is made, the stopper 11 of the fixing device can be securely fixed by sandwiching the rack 6 of the cord 6 from the left and right sides in a stable state.

Next, the operation procedure of the fixing device of the present invention will be explained based on FIG. 4.
If hull 1 is stopped in the same position as shown in the figure, open stop valves B, C, D, and E, close stop valve A, and then move stopper 11 either up or down. Rotate the pump P forward or reverse in the desired direction using the operation button, and then turn the rack 11a of the stopper 11.
Move the tooth tip of the rack 6 to a place where it does not oppose the tooth tip of the rack 6.

Here, the upper and lower cylinders 13 are connected to the pump P, and the piping system is a closed circuit filled with oil. If the same amount of oil comes out of the upper cylinder 16 and flows into the pump P, the cylinder 16
are made to have the same cross-sectional area.

Next, the stop valve A is opened, the closed stop valves F and G are opened, and pressure oil generated by a hydraulic device (not shown) flows through the pipe X to close the stopper 11. If you move it toward rack 6 so that it meshes,
Even if the troughs of the teeth of the rack 6 and the tips of the teeth of the rack 11a of the stopper 11 are not positioned to mesh correctly, the stopper 11 is pushed in so as to mesh with the rack A, and the teeth of the rack 6 When the slope of the stopper 11 starts to come into contact with the slope of the teeth of the stopper 11, the stopper 11 side moves along the teeth of the rack B, so that the stopper 11 automatically moves to properly mesh with the rack 6.

In this case, since the stop valve A is open, the oil can flow freely, so the upper and lower cylinders 16
can operate freely.

Furthermore, when the stopper 11 is engaged with the rack B, even if the cord 3 is tilted in any direction, the shock pad 15 shown in FIG. The teeth on the 11th side can be engaged with the protruding teeth.

Next, as shown in Fig. 2, after engaging the stopper 11 in the correct position, stop valves A to G are closed to close the hydraulic circuit and block the sill-16 and cylinder 10. Then, the stopper 11 engaged with the rack 6 is fixed.・Although consideration has been made to prevent leaks from the outside and inside of the blocked hydraulic system piping, cylinder 13.10, sheet pulp, etc., the stop valves A to GJ used here are Special care must be taken to use one that does not leak externally. Also, in case the cylinder
The hydraulic circuit is configured so that even if internal leakage occurs in the sheet pulp, this device will not be affected.

As described above, the hull 1 of the rig can be completely fixed to the rack 6 of the leg 2 by properly engaging the stopper 11 toward the rack 6 provided on the cord 3 of the leg 2 that stands at an angle. In the fixing device of the present invention, the tip of the rack 6 and the stopper 11 are attached to the tip of the stopper 11.
A device for ascertaining the relative position of, for example, a proximity switch TV
etc., and the fixing device installed to engage the cord 6 of each leg 2 located approximately 50 to 60 meters away from the rig's control room can be operated automatically and remotely. It is extremely easy to operate.

〔Effect of the invention〕

Therefore, if the fixing device of the present invention is adopted for a jack-up rig, even if the leg cord stands at a slight angle, the stopper can be properly engaged with the rack and the hull can be securely fixed to the leg rack. The leg rack is fixed with two stoppers facing each other in the frame, and the horizontal force generated on the tooth surface of the rack is absorbed within this single frame, and the structure is such that no excess force is transmitted to the outside. This has the advantage that the structure is simple and compact.

In addition, since the horizontal reaction force of the rack is not transmitted to the part that supports the fixing device, it can be easily supported.

Furthermore, since the cylinder pushes the stopper into the rack, the teeth on the stopper side are automatically positioned correctly in the troughs of the teeth of the rack, so overload due to one-sided contact etc. is not applied to both the rack and the stopper. , the leg can be safely and reliably fixed to the hull, and the operation can be performed remotely.

On the other hand, if this fixing device is designed according to the survival load, the jack up unit is designed according to the preload, and the two are combined and installed on the rig, the jack up unit can be designed and manufactured based on the survival load. unit)
It can be a much cheaper device.

Shock pads are provided on the top and bottom, and since this device is attached to the entire surface, external forces that are suddenly applied to the entire surface due to the elasticity of the shock band are absorbed by the pads, reducing the beak load (tooth surfaces and other parts). The advantage is that the stopper and rack can be properly engaged even if the leg is tilted due to the elasticity of the pad that holds the rig.

[Brief explanation of drawings]

Fig. 1 is a plan view of a fixing device for a jack up rig according to an embodiment of the present invention in a partially broken state, Fig. 2 is a front view of Fig. 1, and Fig. 3 is a partially broken side view of Fig. 2. Figure, 4th
The figure is a system diagram showing the operating procedure of the fixing device of FIG. 1, FIG. 5 is a plan view of the jack up rig, and FIG. 6 is a front view of FIG. 5. 1...hull, 2...leg, 6...cord, 6...
・Rack, 7... Pinion, 8... Frame, 8a
...Outer frame, 10...Cylinder, 11...Stopper, 11a...Rack, 16...Cylinder, 1
5...Shock Parade.

Claims (1)

[Claims] In a pinion-type jack-up rig, a rack is provided on the cord of the leg that passes through the hull in the vertical direction, and a pinion in the jack-up unit that meshes with the rack is provided on the hull. A frame containing an outer frame is fixed to the hull via a shock pad, and each inner frame is provided inside each of these outer frames to be slidable horizontally by a cylinder, and further,
A fixing device for a jack-up rig, characterized in that a stopper is provided along each inner frame, which is slidable vertically by a cylinder, and has a rack that engages with a rack provided on the cord.