Anchoring and weighing anchor method for semi-submersible barge in shallow water area

Abstract

The present invention relates to the technical field of ships, and particularly to a method for anchoring and weighing anchor in the shallow water area of a semi-submersible barge. The method includes an anchor boat, on which an anchor windlass and a derrick are arranged. It also includes an anchor rope, which is connected to a delta anchor. When anchoring, the derrick is swung to the working position, and then the delta anchor is suspended to a certain height by the derrick. The anchor rope is connected to the winch steel wire rope of the anchor windlass. Then the derrick is swung to the working position for anchoring. After the delta anchor touches the bottom of the water, the anchor boat is moved to sink the delta anchor completely into the water and anchor it to the bottom of the water, so that the delta anchor is completely located at the bottom of the water, enabling the delta anchor to be better anchored to the bottom of the water. When weighing anchor, the delta anchor can be effectively pulled out of the bottom of the water by the anchor windlass, and then the delta anchor is lifted off the bottom of the water by the derrick, thus facilitating the subsequent navigation of the semi-submersible barge and avoiding the situation where the traditional anchor weighing cannot completely pull the delta anchor out of the bottom of the water in the shallow water area due to the close distance between the bottom of the ship and the bottom of the water.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and particularly relates to a method for anchoring and weighing anchor in the shallow water area of a semi-submersible barge. Background Art

[0002] Anchoring is a common way for ships to dock, berth or stay still at sea. Usually, a ship uses its anchor to fix itself to the seabed or riverbed under the water surface to prevent drifting. Anchoring can be used in various situations, including docking at a wharf, waiting for loading and unloading of goods, performing repairs, taking shelter from wind and waves, etc.

[0003] For surface ships (such as engineering ships, test ships, pontoons) that need to perform fixed-point operations in deep water and narrow channels, their conventional anchoring scheme is to use a winch anchor frame to anchor and weigh anchor. According to the water depth at different operation points, the anchor is sunk to the bottom of the water and grabs the soil to achieve positioning. With the development of waterborne ships, semi-submersible barges are often used to transport large steel structures, offshore platforms and movable offshore buildings, and to ship out and install caissons, etc. To ensure the stability of the semi-submersible barge floating on the water, the ship anchors used are getting larger and larger. For example, a delta anchor is used as the ship anchor. However, as Figure 15 shown, the semi-submersible barge 40 is connected to the delta anchor 8 through the ship anchor rope 50. When the semi-submersible barge 40 needs to enter the shallow water area, the shallow water area generally refers to the water area with a water depth of 3 meters to 7 meters. And the draft of the semi-submersible barge 40 is relatively large (for example, for a semi-submersible barge with a model of 45000 DWT, the designed draft is 6.6 meters and the light-load draft is 2.8 meters). When using the conventional anchoring method to anchor from the bow, such as throwing the delta anchor 8 to the bottom of the water through a winch, since in the shallow water area, after the semi-submersible barge 40 takes in water, the bottom of the semi-submersible barge 40 is relatively close to the bottom of the water, there is a situation where the delta anchor 8 cannot be completely thrown to the bottom of the water or the anchor chain of the delta anchor piles up with the anchor body, and the anchoring effect is poor, resulting in the delta anchor 8 being unable to form an effective anchor hold on the bottom of the water and it is difficult to achieve effective floating mooring. In addition, in the shallow water area, even if the anchoring is completed, when it is necessary to weigh anchor, due to the close distance between the bottom of the ship and the bottom of the water, there is a situation where after the anchor chain of the delta anchor 8 is pulled onto the deck of the semi-submersible barge 40, the anchor body is still located at the bottom of the water, resulting in the winch being unable to completely pull the delta anchor 8 out of the bottom of the water, thus affecting the use and operation of the semi-submersible barge 40. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for anchoring and weighing anchor in the shallow water area of a semi-submersible barge aiming at the problem that the semi-submersible barge cannot perform effective anchoring and weighing anchor in the shallow water area.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] A method for anchoring and weighing anchor in shallow water areas of a semi-submersible barge, including an anchor boat, on which an anchor winch frame and a hoisting frame are provided, and the anchor winch frame and the hoisting frame are installed at the end of the anchor boat;

[0007] It also includes an anchor rope, which is connected to a delta anchor;

[0008] It also includes the following steps:

[0009] S1: When the semi-submersible barge anchors, first move the anchor boat to the anchoring area, then luff the hoisting frame to the working position, and then suspend the delta anchor to a certain height through the hoisting frame, and connect the anchor rope to the winch steel wire rope of the anchor winch frame;

[0010] S2: Operate the hoisting frame to pay out the cable, and the anchor winch frame pays out the cable synchronously to lower the delta anchor to the bottom of the water;

[0011] S3: After the delta anchor touches the bottom of the water, move the anchor boat to sink the delta anchor completely into the water, then separate the hoisting frame from the delta anchor, and untie the anchor rope from the winch steel wire rope to complete the anchoring;

[0012] S4: When the semi-submersible barge weighs anchor, connect the anchor rope to the winch steel wire rope, and then the anchor winch frame takes in the cable first to make the delta anchor partially break away from the bottom of the water;

[0013] S5: Lower the hoisting frame, and then connect the delta anchor to the hoisting frame;

[0014] S6: Luff the hoisting frame to the working position, operate the hoisting frame to take in the cable, and the anchor winch frame pays out the cable at the same time to lift the delta anchor above the bottom of the water to a certain height to complete weighing anchor.

[0015] A method for anchoring and weighing anchor in shallow water areas of a semi-submersible barge according to the present application includes an anchor handling vessel. The delta anchor is anchored and weighed by cooperating an anchor windlass with a derrick boom, enabling the semi-submersible barge to carry out anchoring and weighing anchor in shallow water areas. When anchoring, first move the anchor handling vessel to the anchoring area, then swing the derrick boom to the working position, then suspend the delta anchor to a certain height by the derrick boom, connect the anchor line with the winch wire rope of the anchor windlass, and then carry out anchoring. After the delta anchor touches the bottom, move the anchor handling vessel to sink the delta anchor completely into the water and anchor it to the bottom, and disconnect the anchor line from the winch wire rope to separate the delta anchor from the anchor handling vessel, completing the anchoring. Compared with the traditional method of directly anchoring from the bow of the semi-submersible barge, by using the anchor handling vessel to assist in anchoring, the anchor windlass and the derrick boom cooperate coordinately during anchoring, enabling the semi-submersible barge to effectively anchor in shallow water areas. The delta anchor can be completely located at the bottom, and the anchor chain and the anchor body of the delta anchor can be spread out, so that the delta anchor can be better anchored to the bottom. When weighing anchor, the anchor handling vessel is used to assist in weighing anchor. The anchor windlass first takes in the cable to disengage the delta anchor from the bottom. Since the anchoring force of the delta anchor at the bottom is large and the rated load of the anchor windlass is large, the anchor windlass can effectively pull the delta anchor out of the bottom, and then the derrick boom is used to lift the delta anchor off the bottom, suspending the delta anchor above the bottom by the derrick boom, thus facilitating the subsequent use and operation of the semi-submersible barge and avoiding the situation that in shallow water areas, due to the close distance between the bottom of the ship and the bottom, the traditional weighing anchor cannot completely pull the delta anchor out of the bottom.

[0016] Preferably, it further includes a gravity release hook. Before anchoring, first connect the hoisting wire rope of the derrick boom with the gravity release hook, and then connect the delta anchor with the gravity release hook.

[0017] By setting the gravity release hook, in S3, when the delta anchor is completely sunk into the water, at this time the gravity release hook is not stressed, and the hook of the gravity release hook can automatically open, separating the gravity release hook from the delta anchor underwater, avoiding the need for manual underwater operation to separate the delta anchor from the gravity release hook, not only improving the construction efficiency but also ensuring the construction safety and avoiding underwater operation.

[0018] Preferably, it further includes an anchor drum, which is used to connect with the anchor line and can float on the water surface.

[0019] By setting the anchor drum, after completing the anchoring, connect the anchor drum to the anchor line, and then throw the anchor drum into the water so that the anchor drum and the anchor line are in the water. The anchor drum can float on the water surface. During subsequent weighing anchor, it is convenient to find the anchor and the anchor line through the anchor drum. At the same time, the anchor drum can also play a marking role, indicating that there is an anchor near the area of the anchor drum, reminding other ships not to anchor near this area, and also facilitating other ships to bypass the area of the anchor drum when navigating.

[0020] Preferably, in S3, after the anchoring rope and the winch wire rope are untied, the anchor drum is connected to the anchoring rope, and the anchor drum is put into water to complete anchoring.

[0021] Preferably, in S4, before raising the anchor, the anchor drum is first pulled onto the anchoring vessel, and then the anchor drum is separated from the anchoring rope, and then the anchoring rope is connected to the winch wire rope.

[0022] Preferably, in S4, before raising the anchor, the longitudinal and transverse inclinations of the anchored vessel are adjusted to within an allowable range, the transverse inclination of the anchored vessel is less than or equal to 3°, and a certain stern inclination is maintained.

[0023] Preferably, the rated load of the anchor frame is not less than 100t, and the rated load of the lifting frame is not less than 35t.

[0024] Preferably, it further comprises a telescopic cylinder, one end of which is hinged to the anchoring vessel, and the other end of which is hinged to the boom of the crane.

[0025] Preferably, one end of the cable is connected to the anchoring vessel, and the other end of the cable is connected to the boom of the crane.

[0026] Preferably, the delta anchor comprises an anchor body and an anchor chain, and when raising and dropping anchor, the anchor body is connected to the anchor rope and the crane.

[0027] By connecting the anchor body with the anchoring rope and the crane, when raising the anchor, the anchor body of the delta anchor is firmly anchored in the mud on the bottom of the water. By directly connecting the anchoring rope to the anchor body, the tension of the anchoring frame can be directly applied to the anchor body, thereby effectively pulling the anchor body to the bottom of the water, avoiding the situation where the anchor body is difficult to completely break away from the bottom of the water when being pulled by the anchor chain. When dropping anchor, since the anchoring rope and the lifting wire rope of the crane are directly connected to the anchor body, the influence of the anchor chain length on the anchor body when dropping anchor is reduced, making it easier to control the suspension state of the anchor body, reduce shaking, and facilitate operation.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] A method for anchoring and weighing anchor in shallow water area of a semi-submersible barge according to the present application includes an anchor barge, which uses an anchor windlass and a derrick boom to anchor and weigh anchor the delta anchor, enabling the semi-submersible barge to anchor and weigh anchor in shallow water area. When anchoring, first move the anchor barge to the anchoring area, then swing the derrick boom to the working position, then suspend the delta anchor to a certain height by the derrick boom, connect the anchor rope with the winch steel wire rope of the anchor windlass, and then start anchoring. After the delta anchor touches the bottom, move the anchor barge to sink the delta anchor completely into the water and anchor it to the bottom, and disconnect the anchor rope from the winch steel wire rope to separate the delta anchor from the anchor barge, completing the anchoring. Compared with the traditional method of directly anchoring from the bow of the semi-submersible barge, by using the anchor barge to assist in anchoring, the anchor windlass and the derrick boom cooperate in a coordinated manner during anchoring, enabling the semi-submersible barge to effectively anchor in shallow water area, with the delta anchor being completely located at the bottom and the anchor chain and the anchor body of the delta anchor being spread out, so that the delta anchor can be better anchored to the bottom. When weighing anchor, use the anchor barge to assist in weighing anchor. The anchor windlass first takes in the cable to disengage the delta anchor from the bottom. Since the anchoring force of the delta anchor at the bottom is large and the rated load of the anchor windlass is large, the anchor windlass can effectively pull the delta anchor out of the bottom, and then use the derrick boom to lift the delta anchor off the bottom, suspending the delta anchor above the bottom by the derrick boom, thus facilitating the subsequent use and operation of the semi-submersible barge and avoiding the situation that in shallow water area, due to the close distance between the bottom of the ship and the bottom, the traditional method of weighing anchor cannot completely pull the delta anchor out of the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the anchoring schematic diagram of the present application Figure 1 。

[0031] Figure 2 is the schematic diagram of the cooperation between the anchor windlass, the derrick boom and the delta anchor of the present application.

[0032] Figure 3 is the anchoring schematic diagram of the present application Figure 2 。

[0033] Figure 4 is Figure 3 the partial enlarged view of part A of

[0034] Figure 5 is the anchoring schematic diagram of the present application Figure 3 。

[0035] Figure 6 is the weighing anchor schematic diagram of the present application Figure 1 。

[0036] Figure 7 is the weighing anchor schematic diagram of the present application Figure 2 。

[0037] Figure 8 is the weighing anchor schematic diagram of the present application Figure 3。

[0038] Figure 9 is a preferred anchoring schematic diagram of the present application Figure 1 。

[0039] Figure 10 is a preferred anchoring schematic diagram of the present application Figure 2 。

[0040] Figure 11 is a preferred anchoring schematic diagram of the present application Figure 3 。

[0041] Figure 12 is a preferred anchor - raising schematic diagram of the present application Figure 1 。

[0042] Figure 13 is a preferred anchor - raising schematic diagram of the present application Figure 2 。

[0043] Figure 14 is a top view of the present application.

[0044] Figure 15 is a schematic diagram of the semi - submersible barge of the present application

[0045] Markings in the figure: 1 - anchoring vessel, 2 - fender, 3 - anchor - raising frame, 4 - anchor - raising rope, 5 - lifting frame, 6 - lifting wire rope, 7 - gravity detacher, 8 - delta anchor, 81 - anchor body, 82 - anchor chain, 9 - anchor drum, 20 - telescopic oil cylinder, 30 - cable, 40 - semi - submersible barge, 50 - ship's anchor rope. Detailed implementation manners

[0046] The present invention will be further described in detail below in conjunction with test examples and specific implementation manners. However, it should not be understood that the scope of the above - mentioned subject matter of the present invention is limited to the following embodiments. Any technology implemented based on the content of the present invention belongs to the scope of the present invention.

[0047] In the description of the specific embodiments of the present invention, without special explanation, the expression terms of orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the invention product / device / equipment is usually used and placed. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present invention or simplifying the description in specific embodiments, facilitating technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present invention.

[0048] In addition, when terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel. Instead, it can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in directions such as "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still perform its function in the solution of the present invention.

[0049] In addition, when expressions such as "first", "second", "third",... appear in the terms, they are only used to distinguish the descriptions of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0050] In addition, in the description of the embodiments of the present invention, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and can even be a situation exceeding 9.

[0051] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / limited, when terms such as "set", "installed", "connected", "coupled", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, screw connection, etc. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0052] Embodiment 1

[0053] As Figures 1 - 8 shown, a method for anchoring and weighing anchor in the shallow water area of a semi-submersible barge according to this embodiment is characterized by including an anchor boat 1, on which an anchor winch 3 and a crane 5 are provided, and the anchor winch 3 and the crane 5 are installed at the end of the anchor boat 1;

[0054] It further includes an anchor rope 4, and the anchor rope 4 is connected to a delta anchor 8;

[0055] It further includes the following steps:

[0056] S1: When the semi-submersible barge 40 anchors, first move the anchor boat 1 to the anchoring area, then luff the derrick 5 to the working position, then suspend the delta anchor 8 by the derrick 5 to a certain height, and connect the anchor rope 4 to the winch wire rope of the anchor frame 3;

[0057] S2: Operate the derrick 5 to pay out the cable, and the anchor frame 3 pays out the cable synchronously to lower the delta anchor 8 to the bottom of the water;

[0058] S3: After the delta anchor 8 touches the bottom of the water, move the anchor boat 1 to sink the delta anchor 8 completely into the water, then separate the derrick 5 from the delta anchor 8, and untie the anchor rope 4 from the winch wire rope to complete the anchoring;

[0059] S4: When the semi-submersible barge 40 weighs anchor, connect the anchor rope 4 to the winch wire rope, and then the anchor frame 3 first takes in the cable to lift the delta anchor 8 partially off the bottom of the water;

[0060] S5: Lower the derrick 5, and then connect the delta anchor 8 to the derrick 5;

[0061] S6: Luff the derrick 5 to the working position, operate the derrick 5 to take in the cable, and the anchor frame 3 pays out the cable at the same time to lift the delta anchor 8 off the bottom of the water to a certain height to complete weighing anchor.

[0062] It includes an anchor boat 1. The delta anchor 8 is lifted and anchored by the anchor frame 3 on the anchor boat 1 in cooperation with the derrick 5, enabling the semi-submersible barge 40 to lift and anchor in shallow water areas. When anchoring, first move the anchor boat 1 to the anchoring area, then luff the derrick 5 to the working position, then suspend the delta anchor 8 by the derrick 5 to a certain height, and connect the anchor rope 4 to the winch wire rope of the anchor frame 3, and then carry out anchoring. After the delta anchor 8 touches the bottom of the water, move the anchor boat so that the delta anchor 8 sinks completely into the water and is anchored at the bottom, and untie the anchor rope 4 from the winch wire rope to separate the delta anchor 8 from the anchor boat 1 to complete the anchoring. Compared with the traditional method of directly anchoring from the bow of the semi-submersible barge 40, by using the anchor boat 1 for auxiliary anchoring, the anchor frame 3 and the derrick 5 coordinate and cooperate during anchoring, enabling the semi-submersible barge 40 to effectively anchor in shallow water areas, with the delta anchor 8 being completely located at the bottom, and the anchor chain 82 and the anchor body 81 of the delta anchor 8 being spread out, so that the delta anchor 8 can be better anchored at the bottom. When weighing anchor, use the anchor boat 1 for auxiliary weighing anchor. The anchor frame 3 first takes in the cable to lift the delta anchor 8 off the bottom. Since the anchoring force of the delta anchor 8 at the bottom is large and the rated load of the anchor frame 3 is large, the anchor frame 3 can effectively pull the delta anchor 8 off the bottom, and then use the derrick 5 to lift the delta anchor 8 off the bottom, suspending the delta anchor 8 by the derrick 5 to leave the bottom, which is convenient for the subsequent use and operation of the semi-submersible barge 40, avoiding the situation in shallow water areas where, due to the close distance between the bottom of the ship and the bottom of the water, the traditional weighing anchor cannot completely pull the delta anchor 8 out of the bottom.

[0063] In the present application, as Figure 15 shown, the semi-submersible barge 40 is connected to the delta anchor 8 through the ship anchor rope 50. When the semi-submersible barge 40 anchors or weighs anchor in the shallow water area, as Figures 1 - 14 shown, the anchor windlass 3 on the anchor boat 1 cooperates with the lifting frame 5 to anchor or weigh anchor the delta anchor 8, so that the semi-submersible barge 40 and the delta anchor 8 are connected by the ship anchor rope 50, enabling anchoring and weighing anchor in the shallow water area. After anchoring, the anchor rope 4 is untied from the winch steel wire rope, separating the delta anchor 8 from the anchor boat 1. At this time, the delta anchor 8 provides traction to the semi-submersible barge 40 through the ship anchor rope 50 for the semi-submersible barge 40 to berth. Further, when the semi-submersible barge 40 needs to move, the anchor is weighed by the anchor boat 1, and then the delta anchor 8 is thrown to a new position. The semi-submersible barge 40 approaches the delta anchor 8 at the new position by retracting the ship anchor rope 50 to achieve position movement.

[0064] In the present application, a winch mechanism is provided on the anchor windlass 3, and the winch steel wire rope is wound on the winch mechanism. The delta anchor 8 is pulled up or lowered by winding and unwinding the winch steel wire rope.

[0065] As Figures 1 - 4 shown, it further includes a gravity release hook 7. Before anchoring, first connect the lifting steel wire rope 6 of the lifting frame 5 to the gravity release hook 7, and then connect the delta anchor 8 to the gravity release hook 7. Among them, as Figure 2 shown, the gravity release hook 7 is connected to the lifting hook of the lifting frame 5 through the lifting steel wire rope 6, and the hook of the gravity release hook 7 is hung on the anchor chain of the delta anchor 8;

[0066] As Figure 4 shown, by setting the gravity release hook, in S3, when the delta anchor 8 is completely submerged in water, at this time the gravity release hook 7 is not stressed, and the hook of the gravity release hook 7 can automatically open, separating the gravity release hook 7 from the delta anchor 8 underwater, avoiding the need for manual underwater operation to separate the delta anchor 8 from the gravity release hook 7, not only improving the construction efficiency, but also ensuring the construction safety and avoiding underwater operation.

[0067] In this embodiment, the model of the gravity release hook 7 is T048, and the manufacturer is Yangzhou Lishen Lifting Equipment Manufacturing Co., Ltd.

[0068] A preferred method, as Figure 5 shown, further includes an anchor drum 9. The anchor drum 9 is used to connect with the anchor rope 4, and the anchor drum 9 can float on the water surface.

[0069] By setting the anchor drum 9, after anchoring is completed, the anchor drum 9 is connected to the anchor rope 4, and then the anchor drum 9 is thrown into the water so that the anchor drum 9 and the anchor rope 4 are in the water. The anchor drum 9 can float on the water surface. During subsequent anchor retrieval, it is convenient to find the anchor and the anchor rope 4 through the anchor drum 9. At the same time, the anchor drum 9 can also play a marking role, indicating that there is an anchor near the area of the anchor drum 9, reminding other ships not to anchor near this area, and also facilitating other ships to avoid the area of the anchor drum 9 when navigating.

[0070] As Figure 5 shown, in S3, after the anchor rope 4 and the winch wire rope are untied, the anchor drum 9 is connected to the anchor rope 4, and the anchor drum 9 is put into the water to complete the anchoring.

[0071] Marking is carried out on the water through the anchor drum 9 so as to know the position of the delta anchor 8.

[0072] In S4, before anchor retrieval, first pull the anchor drum 9 onto the anchor boat 1, then separate the anchor drum 9 from the anchor rope 4, and then connect the anchor rope 4 to the winch wire rope, so as to facilitate finding the anchor rope 4 through the anchor drum 9.

[0073] In a preferred manner, in S4, before anchor retrieval, first adjust the longitudinal and transverse inclination of the anchor boat 1 within the allowable range, the transverse inclination of the anchor boat 1 is less than or equal to 3°, and a certain stern inclination is maintained.

[0074] By adjusting the longitudinal and transverse inclination of the anchor boat 1 within the allowable range and maintaining a certain range of transverse inclination and a certain stern inclination, the stability of the anchor boat 1 during anchor retrieval is ensured.

[0075] In a preferred manner, the rated load of the anchor winch 3 is not less than 100t, and the rated load of the hoisting frame 5 is not less than 35t. Since the anchoring force of the delta anchor 8 after anchoring at the bottom of the water is very large, an anchor winch 3 with a large rated load is required for anchor retrieval. At the same time, when the delta anchor 8 comes out of the water and enters the water, a hoisting frame 5 with a certain range of load is also required to suspend the delta anchor 8;

[0076] Among them, the specification of the delta anchor 8 in this embodiment is the CJD-14 large holding power anchor, and the manufacturer is Tengzhou Chengjin Machinery Manufacturing Co., Ltd. When anchored at the bottom of the water, the anchor holding power ratio of this anchor can reach 16 - 20 times, so it can provide a large anchoring force underwater. Therefore, a larger anchor winch 3 is required for anchor retrieval.

[0077] In a preferred manner, as Figures 1 - 2 shown, it further includes a telescopic oil cylinder 20. One end of the telescopic oil cylinder 20 is hinged to the anchor boat 1, and the other end of the telescopic oil cylinder 20 is hinged to the boom of the hoisting frame 5. Among them, the hoisting frame 5 is an A-type hoisting frame, and its two support legs are hinged to the deck of the anchor boat 1 so that the hoisting frame 5 can rotate around the hinge point;

[0078] When the derrick 5 needs to be luffed to the working position, as in S2, before the delta anchor 8 enters the water, first control the telescopic cylinder 20 to extend, driving the boom of the derrick 5 to rotate downward around the hinge of the derrick 5 and the deck, so that the boom of the derrick 5 tilts forward, and the derrick 5 drives the delta anchor 8 away from the end of the anchor ship 1, so that the delta anchor 8 is anchored at a position far from the end of the anchor ship 1, avoiding the situation that the delta anchor 8 accumulates at the bottom of the water at the end of the anchor ship 1 when directly anchoring from the end of the anchor ship 1;

[0079] As in S4, before the delta anchor 8 exits the water, first control the telescopic cylinder 20 to extend, driving the boom of the derrick 5 to rotate downward around the hinge of the derrick 5 and the deck, and the derrick 5 drives the delta anchor 8 away from the end of the anchor ship 1, so that the delta anchor 8 is lifted anchor at a position far from the end of the anchor ship 1, avoiding the situation that the delta anchor 8 cannot completely exit the water when directly lifting anchor from the end of the anchor ship 1.

[0080] A preferred method further includes a cable 30, one end of the cable 30 is connected to the anchor ship 1, and the other end of the cable 30 is connected to the boom of the derrick 5.

[0081] When the derrick 5 lifts and drops the delta anchor 8, the cable 30 is used to pull the derrick 5 to enhance the safety performance of the derrick 5 during hoisting.

[0082] A preferred method, the delta anchor 8 includes an anchor body 81 and an anchor chain 82. When lifting and dropping the anchor, the anchor chain 82 is connected to the anchor rope 4 and the derrick 5;

[0083] As Figures 1 - 4 shown, when dropping the anchor, connect the anchor rope 4 to the anchor chain 82;

[0084] The derrick 5 is connected to the gravity release hook 7 through the hoisting wire rope 6, and the hook of the gravity release hook 7 is hung on the anchor chain 82;

[0085] As Figures 6 - 8 shown, when lifting the anchor, first connect the anchor rope 4 to the anchor chain 82, and the anchor winch 3 pulls the anchor chain 82 by retracting the anchor rope 4, and then pulls the anchor body 81 away from the bottom of the water through the anchor chain 82. When the delta anchor 8 leaves the bottom of the water, the derrick 5 is connected to the gravity release hook 7 through the hoisting wire rope 6, and the hook of the gravity release hook 7 is also hung on the anchor chain 82.

[0086] A preferred method, as Figure 1 、 Figure 14 shown, further includes an elastic fender 2. One end of the anchor ship 1 where the anchor winch 3 and the derrick 5 are installed is provided with the elastic fender 2 to prevent the delta anchor 8 from shaking and colliding with the edge of the anchor ship 1 during the process of lifting and dropping the anchor by the derrick 5 due to the influence of water flow or other reasons. Among them, the material of the elastic fender 2 is rubber, polymer material, etc.

[0087] Embodiment 2

[0088] Based on Embodiment 1, as Figures 9 - 13 shown, for an anchor handling method in the shallow water area of a semi-submersible barge in this embodiment, the delta anchor 8 includes an anchor body 81 and an anchor chain 82. When anchoring and weighing anchor, the anchor body 81 is connected to the anchor rope 4 and the derrick 5.

[0089] By connecting the anchor body 81 to the anchor rope 4 and the derrick 5, when weighing anchor, there is a situation where the anchor body 81 of the delta anchor 8 is firmly anchored in the underwater sediment. By directly connecting the anchor rope 4 to the anchor body 81, the pulling force of the anchor winch 3 can be directly applied to the anchor body 81, thereby effectively pulling the anchor body 81 out of the water bottom, avoiding the situation where it is difficult for the anchor body 81 to completely break away from the water bottom when pulling the anchor body 81 through the anchor chain 82.

[0090] As Figures 9 - 11 shown, when anchoring, first connect the gravity release hook 7 to the lifting hook of the derrick 5 through the lifting wire rope 6, then connect the hook of the gravity release hook 7 to the anchor body 81, and then carry out anchoring. Since the anchor rope 4 and the lifting wire rope 6 of the derrick 5 are directly connected to the anchor body 81, the influence of the length of the anchor chain 82 on the anchor body 81 during anchor handling is reduced, facilitating the control of the suspended state of the anchor body 81, effectively reducing the sway, and facilitating the operation;

[0091] As Figures 12 - 13 shown, when weighing anchor, the anchor winch 3 pulls the anchor body 81 out of the water bottom by retracting the anchor rope 4, and then uses the derrick 5 to lift the delta anchor 8 out of the water bottom to a certain height. When weighing anchor, there is a situation where the anchor body 81 of the delta anchor 8 is firmly anchored in the underwater sediment. By directly connecting the anchor rope 4 to the anchor body 81, the pulling force of the anchor winch 3 can be directly applied to the anchor body 81, thereby effectively pulling the anchor body 81 out of the water bottom, avoiding the situation where it is difficult for the anchor body 81 to completely break away from the water bottom when pulling the anchor body 81 through the anchor chain 82.

[0092] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for anchoring a semi-submersible barge in shallow water, characterized in that: The invention comprises an anchoring vessel (1), wherein the anchoring vessel (1) is provided with an anchor frame (3) and a crane frame (5), wherein the anchor frame (3) and the crane frame (5) are installed at the ends of the anchoring vessel (1); It also includes an anchor rope (4), wherein the anchor rope (4) is connected to the delta anchor (8); The following steps are also included: S1: When the semi-submersible barge (40) is anchored, the anchoring vessel (1) is first moved to the anchoring area, and then the crane (5) is luffed to the working position, and then the delta anchor (8) is suspended to a certain height by the crane (5), and the anchor rope (4) is connected to the winch wire rope of the anchor frame (3); S2: operating the crane (5) to loosen the cable, and the anchor frame (3) to loosen the cable synchronously, so as to place the delta anchor (8) into the water bottom; S3: After the delta anchor (8) touches the bottom of the water, the anchoring vessel (1) is moved to make the delta anchor (8) completely sink into the water, and then the crane (5) is separated from the delta anchor (8), and the anchor rope (4) is untied from the winch wire rope to complete the anchoring; S4: When the semi-submersible barge (40) is anchored, the anchor rope (4) is connected to the winch wire rope, and then the anchor frame (3) is firstly reeled in to make the delta anchor (8) partially separate from the bottom of the water; S5: lowering the crane (5), and then connecting the delta anchor (8) to the crane (5); S6: The crane (5) is luffed to the working position, the crane (5) is operated to reel in the cable, and the anchoring frame (3) is simultaneously released to lift the delta anchor (8) off the bottom of the water to a certain height, thus completing the anchoring; It also comprises a telescopic oil cylinder (20), one end of which is hinged on the anchor-casting vessel (1), and the other end of which is hinged on the boom of the crane (5); The crane (5) is an A-type crane, and its two supporting legs are hinged on the deck of the anchor vessel (1) so that the crane (5) can rotate around the hinge; It also includes a gravity unhooking device (7). Before anchoring, the lifting wire rope (6) of the lifting frame (5) is first connected to the gravity unhooking device (7), and then the delta anchor (8) is connected to the gravity unhooking device (7); The delta anchor (8) comprises an anchor body (81) and an anchor chain (82). When the anchor is raised and dropped, the anchor body (81) is connected to the anchor rope (4) and the crane (5).

2. A method for anchoring a semi-submersible barge in shallow water according to claim 1, characterized in that: It also comprises an anchor drum (9), which is used to be connected with an anchor rope (4), and the anchor drum (9) can float on the water surface.

3. A method for anchoring a semi-submersible barge in shallow water according to claim 2, characterized in that: In S3, after the anchor rope (4) and the winch wire rope are untied, the anchor drum (9) is connected to the anchor rope (4), and the anchor drum (9) is put into the water to complete anchoring.

4. A method for anchoring a semi-submersible barge in shallow water according to claim 2, characterized in that: In S4, before raising the anchor, the anchor drum (9) is first pulled onto the anchoring vessel (1), then the anchor drum (9) is separated from the anchor rope (4), and then the anchor rope (4) is connected to the winch wire rope.

5. The method for anchoring a semi-submersible barge in shallow water according to claim 1, characterized in that: In S4, before raising the anchor, the longitudinal and transverse inclinations of the anchored vessel (1) are adjusted to within the allowable range, the transverse inclination of the anchored vessel (1) is less than or equal to 3°, and a certain stern inclination is maintained.

6. A method for anchoring a semi-submersible barge in shallow water according to claim 1, characterized in that: The rated load of the anchor frame (3) is not less than 100 t, and the rated load of the lifting frame (5) is not less than 35 t.

7. The method for anchoring a semi-submersible barge in shallow water according to claim 1, characterized in that: It also comprises a cable (30), one end of which is connected to the anchoring vessel (1), and the other end of which is connected to the boom of the crane (5).

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