CN-121990111-A - Gravity anchor capable of automatically and greatly adjusting length of mooring rope

CN121990111ACN 121990111 ACN121990111 ACN 121990111ACN-121990111-A

Abstract

The invention discloses a gravity anchor capable of automatically and greatly adjusting the length of a mooring rope, and relates to the technical field of offshore mooring equipment, comprising a gravity anchor, a mooring rope, a sealing cover, a scaling box and a safety cable, wherein the sealing cover comprises a flexible sealing sleeve and a cylindrical shell, the cylindrical shell is fixed on the gravity anchor through a bolt, and an overflow hole is formed in the side wall of the cylindrical shell; a filter screen is arranged in the overflow hole, and the lower end of the flexible sealing sleeve is sealed and sleeved at the upper part of the cylindrical shell; the zoom box is positioned in the cylindrical shell and comprises a shell, a fixed shaft and a coil spring; the shell is fixed in the cylindrical shell, the fixed shaft is fixed in the shell, the coil spring is wound on the fixed shaft, one end of the coil spring is fixed on the fixed shaft, and the other end of the coil spring is connected with the cable; the cable is threaded out from the top of the flexible sealing sleeve, the two are fixedly connected at the intersection in a sealing way; one end of the safety cable is fixedly connected with the gravity anchor, and the other end of the safety cable is fixedly connected with a cable on the upper side of the flexible sealing sleeve; the device can realize automatic adjustment of the length of the mooring rope through a pure mechanical structure according to the change of the water level without power supply.

Inventors

QI JINGJING
LI JIANING
XU XINGYU
SHI XIAODONG
LI SHOUQUAN
XU TAO
SUN CHEN
LIU YANG
WANG TINGTING

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司胜利油田分公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (8)

1. The gravity anchor capable of automatically and greatly adjusting the length of the cable comprises the gravity anchor and the cable and is characterized by further comprising a sealing cover, a zoom box and a safety cable, wherein the sealing cover comprises a flexible sealing sleeve and a cylindrical shell, the cylindrical shell is arranged on the gravity anchor, and the side wall of the cylindrical shell is provided with an overflow hole; The zoom box is positioned in a cylindrical shell and comprises a shell, a fixed shaft and a coil spring, wherein the shell is fixed in the cylindrical shell, the fixed shaft is fixed in the shell, the coil spring is wound on the fixed shaft, one end of the coil spring is fixed on the fixed shaft, the other end of the coil spring is connected with a cable, the cable penetrates out of the top of the flexible sealing sleeve and is fixedly connected at an intersection, one end of the safety cable is fixedly connected with a gravity anchor, the other end of the safety cable is fixedly connected with the cable at the upper side of the flexible sealing sleeve, and the length of the safety cable is slightly smaller than the fully unfolded length of the sealing cover.
2. The gravity anchor capable of automatically and greatly adjusting the length of a cable according to claim 1, wherein two circular grooves are formed in the upper portion of the outer wall of the cylindrical shell, and the flexible sealing sleeve and the cylindrical shell are tightly fixed at the circular grooves through the tightening ring.
3. The gravity anchor capable of automatically and greatly adjusting the length of a cable according to claim 1, wherein the flexible sealing sleeve is made of waterproof corrosion-resistant high-strength PVC knife cloth, is folded into a cylindrical shape and is folded and unfolded along with the scaling of the cable.
4. The gravity anchor capable of automatically and greatly adjusting the length of a cable according to claim 1, wherein a buffer assembly is arranged on the cable in the flexible sealing sleeve and comprises an upper connecting rope, a lower connecting rope, an outer pipe and an inner pipe which are coaxially arranged, wherein the upper end of the outer pipe is sealed, and the lower end of the outer pipe is opened; the inner pipe is sealed at the lower end and is opened at the upper end, the inner pipe penetrates through and is fixed on a top plate of the outer pipe, large pistons are slidably arranged in annular spaces of the outer pipe and the inner pipe, a plurality of flexible watertight pipes which can stretch out and draw back are uniformly distributed between the large pistons and the top plate of the outer pipe, a plurality of upper connecting ropes respectively penetrate through one flexible watertight pipe, the lower ends of the upper connecting ropes are respectively fixed on the large pistons, and the upper ends of the upper connecting ropes are converged and fixed at the lower ends of upper side cable ropes; The inner wall lower part of the outer pipe and the inner pipe annulus is provided with a first upper limit and a first lower limit for controlling the travel of the large piston, the first lower limit is positioned at the lower end of the inner wall of the outer pipe and the inner pipe annulus, the upper part of the inner wall of the inner pipe is provided with a second upper limit and a second lower limit for controlling the travel of the small piston, the second upper limit is positioned at the upper end of the inner wall of the inner pipe, the second lower limit is positioned above the first upper limit, and a plurality of through holes are formed in the pipe wall of the inner pipe between the first upper limit and the second lower limit.
5. The gravity anchor capable of automatically and greatly adjusting the length of a cable according to claim 4, wherein the inner cavity of the outer tube and the inner cavity of the inner tube are communicated through a through hole to form a sealed communicating cavity, and clean water is filled in the sealed communicating cavity.
6. A gravity anchor capable of automatically and greatly adjusting the length of a cable according to claim 4, wherein the cable, the upper connecting rope and the lower connecting rope are polyamide ropes.
7. The gravity anchor capable of automatically and greatly adjusting length of a cable according to claim 4, wherein the outer tube and the inner tube are made of ultra-high molecular polyethylene.
8. The gravity anchor for automatically and substantially adjusting a length of a cable according to claim 1, further comprising a grid base fixedly mounted to a bottom of the gravity anchor.

Description

Gravity anchor capable of automatically and greatly adjusting length of mooring rope Technical Field The invention relates to the technical field of offshore mooring equipment, in particular to a gravity anchor capable of automatically and greatly adjusting the length of a mooring rope. Background The offshore floating body facility and the building are widely applied to the fields of fishery cultivation facilities, observation communication equipment, aquatic wind-light wave energy power generation floating structures, offshore resource exploration and exploitation platforms, floating breakwaters and the like, and play an important role in developing deep and open sea economy in China. The mooring system is a key component of the offshore floating structure for positioning. Mooring systems typically consist of a cable and an anchor. Mooring systems are broadly divided into catenary and tensioned types, depending on the type of mooring line. Catenary mooring mainly relies on a higher strength and stiffness anchor chain to provide a stable mooring environment and relies on the weight of the anchor chain itself to provide a restoring force. However, due to the large area occupied by catenary mooring chains on the sea floor, environmental and navigational safety are affected, in which case tension mooring is often used. Tension mooring generally employs a lighter new material as the mooring line, the restoring force of which is mainly provided by the elasticity of the line. Tensioning devices such as winches fixed on ships or ocean platforms are generally used for ensuring that the mooring ropes are kept tight, so that drifting and shaking of the ships can be effectively reduced, and a more stable mooring effect is provided. Simultaneously, the tensioning mooring can also cope with external forces such as strong winds, high waves, tidal changes and the like, and higher stability and safety are provided. However, when the water level of the tension mooring is lowered, the length of the mooring rope is redundant, so that the floating structure is greatly displaced and drifts, or when the water level is raised, the floating structure is submerged, the safety of the floating structure and surrounding structures is endangered, and therefore, the length of the mooring rope must be scaled in time, so that the environment and the safety of the structures are ensured. The existing automatic winch suitable for ship mooring is driven by a motor, a floating body wave eliminating facility which needs long-term mooring and has no power supply can face the problems of difficult installation, resource waste and the like, and the manual adjustment of the length of a mooring rope along with the change of the water level is time-consuming and labor-consuming. In particular, the tide rises and falls within a day, the water level changes by several meters, and a tension mooring system which automatically and greatly scales is urgently needed. Chinese patent CN106253814a discloses a floating type photovoltaic anchoring device suitable for high water head, comprising a foundation, a semicircular hole reserved at the lower part of the foundation, a fixed pulley installed at the upper part of the foundation, a slideway laid under the foundation, a rotary iron ball provided with a cylindrical hole reserved on the slideway, a tripod installed on the rotary iron ball, a bottom edge of the tripod penetrating the cylindrical hole, a cable connected with the top of the tripod, a cable connected with a photovoltaic array across the fixed pulley, an anti-collision device arranged at the end of the photovoltaic array, a brake iron ball arranged at the upper part of the tripod and matched with the semicircular hole, the device is used by being on shore and is not suitable for mooring offshore floating body facilities. Disclosure of Invention The invention aims at overcoming the defects in the prior art and provides a gravity anchor capable of automatically and greatly adjusting the length of a cable. The technical scheme of the invention is that the gravity anchor capable of automatically and greatly adjusting the length of a cable comprises a gravity anchor, a cable, a sealing cover, a zoom box and a safety cable, wherein the sealing cover comprises a flexible sealing sleeve and a cylindrical shell, the cylindrical shell is arranged on the gravity anchor, and the side wall of the cylindrical shell is provided with an overflow hole; The zoom box is positioned in a cylindrical shell and comprises a shell, a fixed shaft and a coil spring, wherein the shell is fixed in the cylindrical shell, the fixed shaft is fixed in the shell, the coil spring is wound on the fixed shaft, one end of the coil spring is fixed on the fixed shaft, the other end of the coil spring is connected with a cable, the cable penetrates out of the top of the flexible sealing sleeve and is fixedly connected at an intersection, one end of the safety cable is fixedly connected w