Device for equalisation of anchor ropes or chains tension

FIELD: transport.

SUBSTANCE: proposed device for equalisation of anchor ropes or chains tension contains two or more crossheads frame adjacent ends of which are connected by anchor ropes or chains with ends of corresponding double-armed lever, and the central part of the latter and the second ends of two utmost crossheads, as well as casings of crosshead upper blocks are connected by anchor ropes or chains with floating ice-proof platform. The casings of crosshead lower blocks are connected by anchor ropes or chains with anchors of this platform located at sea bed. All blocks of each crosshead are made movable and seized by equalising rope or chain the ends of which are fixed on crosshead frame ends which crosshead is provided with guides for block casings, the latter are placed in these guides with possibility to provide absence of their contact with other parts of crosshead metal structure during this device operation.

EFFECT: higher carrying capacity of floating ice-proof platform anchoring system, increase in its reliability, lower weight of device for equalisation of anchor ropes or chains tension.

3 cl, 6 dwg

 

The invention relates to equipment for drilling oil and gas in the North sea and Arctic conditions and can be used to anchor the system of floating marine ice-resistant platforms used for drilling and production of oil and gas in the sea, and also in the anchor system of floating ice piers.

A device for equalizing the tension anchor cables or chains used in anchor system semi-submersible floating ice-resistant platform, containing a spreader, which clamps the lower blocks using anchor cables or chains attached to anchors located on the bottom of the sea, and to the ends of the frame beam and clamps the upper block attached to the lower ends of the anchor cables or chains, through which the connection of the bar with this platform, while the traverse blocks are movable and covered egalitarian rope or chain, the ends of which are attached to the ends of the frame beam, provided with guides for cages blocks, and clips blocks placed in these guides, with the possibility not touch other parts of the steel beam during operation of this device. [1]

The disadvantage of this device is insufficient bearing capacity of the anchor system of floating ice-resistant platform, using it as large in the frame with its beam at long last limits the number attached to one traverse this device anchor cables or chains, tension is aligned. In addition, the number attached to the device anchor cables or chains and accordingly the carrying capacity of the anchor system limits required a relatively large distance between adjacent anchor cables or chains because of the relatively large diameter blocks of the bar, since large load acting on a floating ice platform from the impending ice dictate the use of high-strength surge cables having a relatively large diameter, or circuits having a relatively large width of the chain link and its step. Large required distance between adjacent anchor cables or chains leads to the necessity of increasing the length of the frames traverse and as a result increase the cost and the required dimensions of the structural elements of the floating ice-resistant platforms, joined an anchor cables or chains. In addition, the low reliability of the known device and the great weight of its traverse in mind the low accuracy location on the seabed anchors floating ice-resistant platform, as in this case, in the frame of its beam having a large bending moments from the tension of the anchor cables or chains. The reliability of this device reduces the presence of only one-size-fits rope or chain in the design of its traverse, is why when the breakage of the anchor system of floating ice-resistant platform fails.

The objective of the invention is to increase the bearing capacity of the anchor system of floating ice-resistant platform while reducing the weight of the device for equalizing the tension anchor cables or chains, which is used to anchor the system of this platform, in addition, reducing the cost and the required dimensions of the structural elements of the floating ice-resistant platforms, which are attached to the anchor rope or chain with this device, and also improving the reliability of the latest and anchoring system of this platform.

The problem is solved in that the anchor system of floating ice-resistant platform, using the device for equalizing the tension anchor cables or chains, the last applied two or more plates, the adjacent ends of the frames which are connected to the anchor cables or chains to the ends of the respective two shoulders of the lever, and the Central part of the last and second ends of the frames at two traverse connected by anchor cables or chains with floating ice-resistant platform. In addition, the task is solved by the fact that one or more guides for holding blocks of each beam is made to move located in these blocks with clamps along the latter. Also the problem is solved in that each holder of units traverse this device is equipped with look no further than the two blocks, mounted on the same axis, forming in each traverse four rows of blocks covered by the four relevant balancing ropes or chains, the ends of which are attached at the ends of the frame beam to the ends of the two shoulders of the levers, and at one end of each frame traverses two intermediate balance rope or chain attached to the ends of the small two shoulders of the lever, and the two extreme surge rope or chain attached to the ends of the big two shoulders of the lever, with a possible maximum rotation angles of each of these two two shoulders arms while rotating on its own axis defined by two stops rotation angle of the lever, which, as the axes of these levers, installed on the same end of each frame beam, and the second end of each frame beam to the ends of two small two shoulders arms attached respectively at one extreme and the one nearest to him interim balance rope or chain, with a possible maximum rotation angles of each of these two shoulders arms while rotating on its own axis defined by two stops rotation angle of the lever, which as the data axis levers mounted on the second end of each frame beam, while the maximum linear displacement of the attachment point leveling cables or chains at the ends of each of the four mentioned dup is ecig levers along the axis of the end of the relevant balance ropes or chains during rotation of these levers on their axes from the initial operating position to touch their respective limiting the angle of rotation of the lever in each traverse approximately equal.

Comparative analysis revealed the presence of new distinctive features that characterize the invention level:

- in anchor system of floating ice-resistant platform applied two or more traverse device for equalizing the tension anchor cables or chains, the adjacent ends of which are connected to the anchor cables or chains to the ends of the respective two shoulders of the lever, and the Central part of the last and second ends of the frames at two traverse connected by anchor cables or chains with floating ice-resistant platform that provides equal tension of a large number of same anchor cables or chains all traverse this device and result in much increase the carrying capacity of the anchor system of floating ice platforms and to reduce the weight of these devices;

one or more guides for holding blocks of each beam is made to move located in these blocks with clamps along the latter, allowing the low accuracy location on the seabed anchors floating ice-resistant platform virtually eliminate the effects of bending moments from the tension of the anchor cables or chains on the frame traverse and thus reducing the weight of the traverse, and to increase the reliability of the device is the STV for equalizing the tension anchor cables or chains, as well as the entire anchor system of floating ice platform;

each holder of units traverse this device is equipped with four blocks mounted on one axis, forming in each traverse four rows of blocks covered by the four relevant balancing ropes or chains, the ends of which are attached at the ends of the frame beam to the ends of the two shoulders of the levers at one end of each frame traverses two intermediate balance rope or chain attached to the ends of the small two shoulders of the lever, and the two extreme surge rope or chain attached to the ends of the big two shoulders of the lever, with a possible maximum rotation angles of each of these two shoulders arms while rotating on its own axis defined by the two limiters angle lever, which, as the axes of these levers, mounted on the same end of each frame beam, and the second end of each frame beam to the ends of two small two shoulders arms attached respectively at one extreme and the one nearest to him interim balance rope or chain, with a possible maximum rotation angles of each of these two shoulders arms while rotating on its own axis defined by two stops rotation angle of the lever, which, as the data axis of the levers, mounted on the second end of each frame beam, if e is ω maximum linear displacement of the attachment point balance ropes or chains at the ends of each of the four mentioned two shoulders arms along the axis of the end of the relevant balance ropes or chains when the rotation of these levers on their axes from the initial operating position to touch their respective limiting the angle of rotation of the lever in each traverse approximately equal, resulting in greatly reduced the required diameter leveling cables or the width of the link and the step equalization circuits, thus decreasing the required diameter of the beam and blocks will decrease the minimum allowable distance between adjacent anchor cables or chains attached to the clamps blocks of the bar. Increasing the allowable number of anchor cables or chains attached to the clamps blocks of each beam, and increases the bearing capacity of the anchor system of floating ice-resistant platform, using this device, at a constant traverse the length included in the latter. Also decrease the cost and the required dimensions of the structural elements of the floating ice-resistant platform, joined an anchor rope or chain with this device. In addition, in the case of breakdown of one of the four leveling cables or chains of the bar, two of them will still carry its load at the respective margins of the latter, which increases the reliability of the device for equalizing the tension anchor cables or chains and anchor system of floating ice is latform.

These novel features and achievable technical result allows to consider the proposed device for equalizing the tension anchor cables or chains corresponding inventive step.

Figure 1 shows a device for equalizing the tension anchor cables or chains, figure 2 shows a section a-a of the device, figure 3 shows a fragment of the frame traverses the device, guides for holding the blocks which are designed to move located in these blocks with clamps along the latter. Figure 4 shows the traverse of this device, in which each holder units are equipped with four blocks mounted on one axle. Figure 5 shows a section b-B, and 6 cut-In of the bar of this device, in which each holder of units is equipped with four blocks mounted on one axis, and two shoulders, the arms of the bar are in the original operating position.

Device for equalizing the tension anchor cables or chains contains two or more traverse, clip 1 of the lower block 2 which anchor cables or chains 3 are connected with the anchor 4, and to their magazines 5 top 6 blocks attached to the anchor rope or chain 7 floating ice-resistant platform, all the blocks of each traverse of this device are movable with rotation axes 8 and RA is medeni in the guide rails 9, with jumper 10, and covered leveling cables or chains 11, the ends of which are attached at the ends of the frames 12 to traverse their rigging nodes 13, to one end frames of the two extreme traverse attached to one anchor rope or chain 14 floating ice-resistant platform, and the adjacent ends of the RAM head plate connected to the anchor cables or chains 15 with rigging nodes 16 on the ends of the respective two shoulders of the lever 17, lifting the node 18 of the Central part of this lever is attached to the anchor rope or chain 19 floating ice-resistant platform. And in the case of inaccurate location of the anchor device includes one or more guide 20 in each traverse, installed on the axes 21 and having a jumper 22.

When installed in the traverse of this device in each clip 23 blocks of four lower blocks 24, and the clip 25 blocks of four upper blocks 26 on the axis 27 all blocks are placed in the guides 28 with jumpers 29, and covered four relevant balancing ropes or chains, and at one end of the frame 30 traverses two intermediate balance rope or chain 31 is attached to the ends of the small two shoulders of the lever 32, and the two extreme surge rope or chain 33 is attached to the ends of the big two shoulders of the lever 34 and at the other end of this frame beam to the ends of the two mentioned small two-shoulders rich the GOV attached respectively one earlier mentioned the extreme and the one closest to the last mentioned earlier interim balance rope or chain. While all these small two shoulders levers are mounted on axes 35, and their possible maximum rotation angles on them set appropriate limiters angle of rotation 36 of the lever, and the previously mentioned large two shoulders lever is mounted on a shaft 37, and its maximum possible rotation angles it is set two limiters angle of rotation 38 of the lever.

Device for equalizing the tension anchor cables or chains is as follows. When a load is applied to the anchor cables or chains floating ice-resistant platform they will all be stretched, tensioned and balance ropes or chains 11 in all traverse this device, equalizing the tension of the same name anchor cables or chains within one of the corresponding beam, and two shoulders, the arms 17 will provide the same tension, same anchor cables or chains attached to the corresponding nodes of all traverse.

In the case of inaccurate location of the anchors on the sea bottom, one or more guides for holding blocks of each beam is made to move located in these blocks with clamps along the latter, while the guides 20 of the bar with the appropriate clamps blocks are rotated axes 21 and provides a adjust to any misalignment of these blocks, resulting in virtually no bending moments in m is telecontrolli traverse this device.

When installing each of the holder units traverse this device four units on one axis 27, covered by two egalitarian intermediate ropes or chains 31 and two surge extreme ropes or chains 33, in the case of loading the anchor cables or chains floating ice platforms tension data egalitarian ropes or chains aligned with one small two shoulders of the lever 32 and one large two shoulders of the lever 34 mounted on one end of the frame 30 traverse, and two small two shoulders arms 32 mounted on the other end of the frame 30 traverse.

In case of breakdown of one of the four leveling cables or chains, two of them continue to carry the full load per traverse, at the respective margins of these ropes or chains. As well as the maximum linear displacement of the attachment point of all leveling cables or chains at the ends of each of the two shoulders of the levers along the axis of the end of the relevant balance ropes or chains during rotation of these levers on their axes from the initial operating position to touch their respective limiting the angle of rotation of the lever in each traverse approximately equal, then the two tension continues to carry the full load leveling cables or chains will be lining the two suitable and two shoulders arms, located in the original position, without touching their limiters angle of rotation of the lever.

Sources of information

1. RF patent №2174930 - "semi-submersible Floating ice-resistant platform A.S., Kuzmin" 07.07.1999.

1. Device for equalizing the tension anchor cables or chains floating ice-resistant platform, containing a spreader, clamps the lower blocks which anchor cables or chains connected to anchors located on the bottom of the sea, and clips the top of the blocks with the help of anchor cables or chains connected with the floating ice-resistant platform, all the blocks are movable and covered egalitarian rope or chain, the ends of which are attached to the ends of the frame beam, provided with guides for cages blocks and holder blocks placed in these guides, with the possibility not touch other parts of the steel beam during operation of this device, characterized the fact that the anchor system of floating ice-resistant platform applied two or more traverse this device, the adjacent ends of the frames which are connected to the anchor cables or chains to the ends of the respective two shoulders of the lever, and the Central part of the last and second ends of the frames at two traverse connected by anchor cables or chains with floating ice-resistant platform./p>

2. Device for equalizing the tension anchor cables or chains according to claim 1, characterized in that one or more guides for holding blocks of each beam is made to move located in these blocks with clamps along the latter.

3. Device for equalizing the tension anchor cables or chains according to claim 1, characterized in that each holder of units of its traverse is equipped with four blocks mounted on one axis, forming in each traverse four rows of blocks covered by the four relevant balancing ropes or chains, the ends of which are attached at the ends of the frame beam to the ends of the two shoulders of the levers at one end of each frame traverses two intermediate balance rope or chain attached to the ends of the small two shoulders of the lever, and the two extreme surge rope or chain attached to the ends of the big two shoulders of the lever, with a possible maximum rotation angles of each of these two two shoulders arms while rotating on its own axis defined by two stops rotation angle of the lever, which, as the axes of these levers, mounted on the same end of each frame beam, and the second end of each frame beam to the ends of two small two shoulders arms attached respectively at one extreme and the one nearest to him interim hranitel the mu rope or chain, with a possible maximum rotation angles of each of these two shoulders arms while rotating on its own axis defined by two stops rotation angle of the lever, which, as the data axis of the levers, mounted on the second end of each frame beam, while the maximum linear displacement of the attachment point leveling cables or chains at the ends of each of the four mentioned two shoulders arms along the axis of the end of the relevant balance ropes or chains during rotation of these levers on their axes from the initial operating position to touch their respective limiting the angle of rotation of the lever in each traverse approximately equal.



 

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7 cl, 2 dwg

FIELD: transport.

SUBSTANCE: floating helicopter take-off, landing and mooring complex has pontoon hull with top deck and helideck with railing and stairway. Top deck accommodates superstructure with helideck arranged on its top. Anchoring means represent at least three mooring anchors, primarily, stationary mooring bitts mounted on water area bottom and arranged along mooring equipment. Links are pivoted to aforesaid mooring bitts to couple with floating complex hull, the pivots having at least two degrees of freedom. Links of the extreme bitts and center bitts are pivoted together, the pivot having degree of freedom in horizontal plane to form triangular frame. Frame links and third independent link are articulated with mooring bitts via pivots allowing two degrees of freedom in horizontal and vertical planes around the axis parallel to complex hull. Hull upper deck accommodates devices intended for docking low and average deadweight ships, appliances for towing mooring complex and control station for helicopter take-off and landing ships mooring.

EFFECT: higher survivability.

13 cl, 4 dwg

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