CN115924031A - Construction method for connecting floating fan and mooring chain - Google Patents

Abstract

The invention belongs to the technical field of offshore wind power, and discloses a construction method for connecting a floating fan and a mooring chain, which comprises the following steps: laying a plurality of mooring chains; after the floating fan is in place on site, temporarily mooring the semi-submersible platform of the floating fan with a temporary cable of a crane ship to prevent the floating fan from shifting before being connected with a mooring chain; fixing the fixed end of a mooring chain to the seabed by adopting a suction anchor, connecting the traction end of the mooring chain with a crane of a crane ship, and respectively penetrating a plurality of mooring chains into a plurality of chain stoppers; the crane pulls the mooring chain and cooperates with the platform ballast system to enable the semi-submersible platform to reach the design draft and to be tensioned. The temporary mooring of the floating fan is completed by adopting the crane ship, so that the crane ship is heavy in weight, strong in wind resistance and stable in temporary mooring; meanwhile, a crane of the crane ship is adopted to tighten the mooring chain, so that the operation is more convenient, an additional working ship is not needed, the working efficiency is improved, the operation is simpler, and the crane can work in certain offshore high wind environment.

Description

Construction method for connecting floating fan and mooring chain

Technical Field

The invention relates to the technical field of offshore wind power, in particular to a construction method for connecting a floating type fan and a mooring chain.

Background

With the development of offshore wind power, the floating type fan is widely applied to deep and distant sea. The semi-submersible platform of the floating wind turbine needs to be fixed on the sea by a mooring chain to prevent the floating wind turbine from being displaced. In the prior art, one end of a mooring chain is fixed on the seabed, the other end of the mooring chain is connected with a tug, the tug is adopted for temporary mooring of the floating fan, but the structure of the tug is small in size, light in weight and weak in wind resistance; the connecting mooring chain and the tensioning mooring chain also adopt a tug, and the other end of the mooring chain is tensioned through the tug so as to achieve the pre-tightening force required by the floating type fan.

When the method is applied, the tug cannot resist the sea strong wind when the sea strong wind is met, the construction needs to be stopped, and the working efficiency is reduced.

Disclosure of Invention

The invention aims to provide a construction method for connecting a floating fan and a mooring chain, which can finish temporary mooring of a semi-submersible platform of the floating fan by using a crane ship and fix the semi-submersible platform on the sea by tensioning the mooring chain through a crane, thereby improving the working efficiency, and the crane ship can resist the strong wind on the sea.

In order to achieve the purpose, the invention adopts the following technical scheme:

the construction method for connecting the floating fan and the mooring chain comprises the following steps:

laying a plurality of mooring chains, and fixing the fixed ends of the mooring chains to the seabed;

temporarily mooring the semi-submersible platform with a temporary cable of a crane ship;

the traction end of the mooring chain is connected with a crane of a crane ship, and the plurality of mooring chains are respectively arranged in the plurality of chain stoppers correspondingly arranged with the mooring chains in a penetrating manner;

the crane pulls the mooring chains and is matched with a platform ballast system, so that the semi-submersible platform reaches the design draft and is tensioned, and the set pre-tightening force between the mooring chains and the semi-submersible platform is reached.

As an alternative, the connection of the crane to the mooring chain is specifically:

firstly, a traction steel wire rope and a switching steel wire rope are arranged on the crane, then one end of the traction steel wire rope, which is far away from the crane, penetrates through the chain stopper to be connected with the traction end of the mooring chain, and the crane pulls the traction steel wire rope to drive the traction end of the mooring chain to reach an appointed position;

and separating the traction steel wire rope from the traction end of the mooring chain, connecting the switching steel wire rope with the traction end of the mooring chain, and pulling the switching steel wire rope by the crane to drive the mooring chain to tighten the semi-submersible platform.

As an alternative, before the traction steel wire rope is connected with the traction end of the mooring chain, one end of a transition steel wire rope is connected with the traction end of the mooring chain, the other end of the transition steel wire rope is connected with one end of the traction steel wire rope, which is far away from the crane, and then the crane pulls the traction steel wire rope to drive the transition steel wire rope to pass through the chain stopper;

and then separating the traction steel wire rope from the transition steel wire rope, connecting one end of the switching steel wire rope, which is far away from the crane, with the transition steel wire rope, and drawing the switching steel wire rope by the crane to tighten the mooring chain through the transition steel wire rope.

As an alternative, a small hook and a large hook are arranged on the crane, the small hook is connected with the traction steel wire rope, and the large hook is connected with the switching steel wire rope.

As an alternative, after the mooring chain is laid, a temporary buoy is arranged on the mooring chain, and the temporary buoy can mark the position of the mooring chain.

As an alternative, the transition steel wire rope and the traction end of the mooring chain, the transition steel wire rope and the traction steel wire rope, and the transition steel wire rope and the transfer steel wire rope are connected by shackles.

As an alternative, a chain guide wheel corresponding to the chain stopper is further arranged on the semi-submersible platform, and the traction end of the mooring chain sequentially penetrates through the chain guide wheel and the chain stopper.

As an alternative, the semi-submersible platform comprises three mutually connected upright columns, three chain stoppers are arranged on each upright column, and three mooring chains are respectively penetrated through the three chain stoppers on each upright column.

As an alternative, when the crane pulls the mooring chains, the design draft of the semi-submersible platform is adjusted and the mooring chains are tensioned by adopting a mode of sequentially pulling a plurality of mooring chains respectively and matching with the platform ballast system.

As an alternative, the platform ballast system is a water ballast system that adjusts the draft of the semi-submersible by adding water within the semi-submersible.

The invention has the beneficial effects that:

the invention provides a construction method for connecting a floating fan and a mooring chain, which comprises the following steps: the method comprises the following steps that a plurality of mooring chains are laid in advance by a crane ship, the fixed ends of the mooring chains are anchored to the seabed, and after a floating type fan is in place on site, a semi-submersible platform of the floating type fan and a temporary cable of the crane ship are temporarily moored to prevent the floating type fan from shifting before being connected with the mooring chains; the traction end of the mooring chain is connected with a crane of the crane ship, and the plurality of mooring chains are respectively arranged in the plurality of chain stoppers in a penetrating manner; the crane pulls the mooring chain and cooperates with the platform pressing system to enable the semi-submersible platform to reach the design draft and be tensioned. The construction method for connecting the floating fan and the mooring chain completes temporary mooring of the floating fan by adopting the crane ship, and the crane ship has the advantages of heavy weight, strong wind resistance and stable temporary mooring; meanwhile, the mooring chain is tensioned by adopting the crane of the crane ship, so that the operation is more convenient, other workboats required for tensioning are not needed, the working efficiency is improved, the operation is simpler, and the crane can work in certain offshore high wind environment.

Drawings

FIG. 1 is a schematic illustration of temporary mooring of a crane vessel to a semi-submersible platform by temporary cables in an embodiment of the present invention;

fig. 2 is a schematic view of a transition wire rope in an embodiment of the invention connected to a mooring chain;

FIG. 3 is a schematic illustration of a transition wire rope and a transition wire rope in an embodiment of the invention;

FIG. 4 is a schematic view of the hook of the crane pulling the transfer cable and driving the mooring chain through the chain stopper in an embodiment of the present invention;

FIG. 5 is a schematic illustration of the semi-submersible platform after being lowered to a design depth in an embodiment of the present invention.

In the figure:

1. a semi-submersible platform; 11. a column; 111. a chain stopper; 112. a guide sprocket;

2. a mooring chain; 3. a temporary buoy; 4. a suction anchor; 5. a work boat;

100. a crane vessel; 101. a temporary cable; 102. hoisting a machine; 1021. a small hook; 1022. a big hook; 103. a traction wire rope; 104. transferring a steel wire rope; 105. a transition wire rope; 106. and (6) shackle dismounting.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar parts throughout or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

With the development of offshore wind power, a floating type fan is more and more widely applied to deep and remote sea areas, the floating type fan comprises a semi-submersible platform 1 and a fan, the fan is installed on the semi-submersible platform 1 and used for generating electricity, and the semi-submersible platform 1 needs to be fixed on the sea to prevent the floating type fan from floating away along with the sea wind.

As shown in fig. 1 to 5, the embodiment of the present invention provides a construction method for connecting a floating wind turbine to a mooring chain 2, so as to lower a semi-submersible platform 1 of the floating wind turbine to a designed depth and fix the same. Floating wind turbines come in many forms and the semi-submersible 1 can be provided with three or four columns 11.

In this embodiment, taking three columns 11 as an example, each column 11 is provided with three chain stoppers 111, and the construction method for connecting the floating wind turbine and the mooring chain 2 includes the following steps:

before the semi-submersible platform 1 of the floating wind turbine is put in place on site, nine mooring chains 2 are laid, after the mooring chains 2 are laid, temporary buoys 3 are connected to the mooring chains 2 and are placed on the sea bottom, and the temporary buoys 3 can mark the positions of the mooring chains 2 so as to find the mooring chains 2 by picking up the temporary buoys 3. Meanwhile, the floating fan is ensured to finish the laying of the mooring chain 2 before being hauled to the site, so that the floating fan can be immediately unfolded to work after being in place, and the working efficiency is improved;

the crane ship 100 finishes on-site anchoring and in-place work, the semi-submersible platform 1 of the floating type fan finishes on-site in-place work, and the semi-submersible platform 1 and a temporary cable 101 of the crane ship 100 are temporarily moored to prevent the floating type fan from shifting;

every three mooring chains 2 correspond to three chain stoppers 111 on one upright post 11, the chain stoppers 111 have the function of preventing the mooring chains 2 from backing, the fixed ends of the mooring chains 2 are fixed on the seabed through suction anchors 4, the form of an anchoring base is not limited in the embodiment, the traction ends of the mooring chains 2 are connected with the crane 102, and each mooring chain 2 is inserted into the corresponding chain stopper 111;

nine mooring chains 2 are pulled by the crane 102 and matched with a platform ballast system, so that the semi-submersible platform 1 of the floating fan reaches the design draft and is tensioned by the mooring chains 2, a set pre-tightening force is achieved between the semi-submersible platform 1 and the mooring chains 2, and the semi-submersible platform 1 is fixed on the sea to prevent drifting away.

The construction method for connecting the floating fan and the mooring chain 2 completes the temporary mooring of the floating fan by adopting the crane ship 100, the crane ship 100 has large weight, strong wind resistance and stable temporary mooring; meanwhile, the mooring chain 2 is tensioned by the crane 102 of the crane ship 100, so that the operation is more convenient, other workboats required for tensioning are not needed additionally, the working efficiency is improved, the operation is simpler, and the crane ship can work in certain offshore strong wind environment.

The crane 102 is provided with a small hook 1021 and a large hook 1022, the large hook 1022 and the small hook 1021 are arranged at intervals, and the height of the small hook 1021 is higher than that of the large hook 1022; before the crane 102 is connected with the mooring chain 2, the small hook 1021 is used for drawing the traction steel wire rope 103 to drive the mooring chain 2 to reach a designated position, then the traction steel wire rope 103 is separated from the traction end of the mooring chain 2, the switching steel wire rope 104 is connected with the traction end of the mooring chain 2, and the large hook 1022 is used for drawing the switching steel wire rope 104 to drive the mooring chain 2 to tension the semi-submersible platform 1. In the structure, the height of the small hook 1021 is higher than that of the large hook 1022, so that the small hook 1021 can realize longer-distance traction, but the distance of the traction steel wire rope 103 is longer, when the mooring chain 2 is pulled to a certain position, the switching steel wire rope 104 with shorter distance is replaced to realize continuous pulling of the mooring chain 2, and the bearing capacity of the large hook 1022 is better than that of the small hook 1021, so that the mooring chain 2 can be pulled more tightly.

In order to facilitate the connection of the traction cable 103 to the mooring chain 2, a transition cable 105 is first used to connect between the traction end of the mooring chain 2 and the end of the traction cable 103 facing away from the hook 1021.

Referring to fig. 2-4, the process of connecting mooring chain 2 to semi-submersible platform 1 is: firstly, manually using a working boat 5 to match with a temporary buoy 3 to find a mooring chain 2, and temporarily fixing the traction end of the mooring chain 2 on a deck; then, connecting the traction end of the mooring chain 2 with one end of a transition steel wire rope 105, connecting the other end of the transition steel wire rope 105 with one end of the traction steel wire rope 103 departing from a small hook 1021, and drawing the traction steel wire rope 103 through the small hook 1021 to enable the transition steel wire rope 105 to pass through a chain stopper 111; then, the traction steel wire rope 103 is separated from the transition steel wire rope 105, one end of the transfer steel wire rope 104, which is far away from the large hook 1022, is connected with the transition steel wire rope 105, the transfer steel wire rope 104 is pulled by the large hook 1022, the transition steel wire rope 105 drives the mooring chain 2 to pass through the chain stopper 111, and the mooring chain 2 is tensioned.

Optionally, when the crane 102 pulls the mooring chains 2, nine mooring chains 2 may be sequentially pulled, that is, one upright column 11 is selected first, and three mooring chains 2 are sequentially pulled, respectively, and a set pre-tightening force is achieved; sequentially pulling the mooring chains 2 on the other two upright columns 11 to respectively reach the set pre-tightening force; and cooperates with the platform ballast system to adjust the draft of the semi-submersible platform 1. It should be noted that after the crane ship 100 completes the first pulling of nine mooring chains 2, if the set pre-tightening force is not reached, the crane ship can perform the second pulling until the set pre-tightening force is reached, and the semi-submersible platform 1 reaches the design draft and the mooring chains 2 reach the set pre-tightening force by adopting the alternate step-by-step pulling and simultaneously matching with the platform ballast system. It will be appreciated that the chain stopper 111 has the effect of preventing the mooring chain 2 from backing out, so that the tension between the mooring chain 2 and the semi-submersible platform 1 does not change after the mooring chain 2 is unhooked from the crane 102.

Referring to fig. 5, after the semi-submersible platform 1 reaches the design draft, and the mooring chain 2 is tensioned, the transition steel wire rope 105 is separated from the mooring chain 2, and the chain stopper 111 can prevent the mooring chain 2 from retracting, so as to ensure that the set pretightening force is not changed, so that the semi-submersible platform 1 is fixed on the sea and does not move.

Alternatively, the crane ship 100 may be selected in plural, the number of the crane ships 100 may be selected according to actual conditions, and the plurality of crane ships 100 may adjust the mooring chain 2 without moving the crane ships 100, so that the adjustment is more convenient.

Optionally, each of the columns 11 is further provided with three chain guide wheels 112, and the towing end of the mooring chain 2 passes through the chain guide wheels 112 and then passes through the chain stopper 111. When the crane 102 pulls the mooring chain 2, the chain guide wheel 112 has a guiding function, so that the pulling of the mooring chain 2 can be facilitated.

Optionally, the transition steel wire 105 and the traction end of the mooring chain 2, the transition steel wire 105 and the traction steel wire 103, and the transition steel wire 105 and the transit steel wire 104 are connected by shackles 106. The shackle 106 in this configuration allows for easier and faster attachment and detachment.

Optionally, the platform ballast system is a water ballast system, which adjusts the weight of the semi-submersible platform 1 by adding water to the columns 11 to bring it to the designed draft.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The construction method for connecting the floating fan and the mooring chain is characterized by comprising the following steps of:

laying a plurality of mooring chains (2), and fixing the fixed ends of the mooring chains (2) on the seabed;

temporarily mooring the semi-submersible platform (1) with a temporary cable (101) of a crane vessel (100);

the traction end of the mooring chain (2) is connected with a crane (102) of a crane ship (100), and the plurality of mooring chains (2) are respectively arranged in the plurality of chain stoppers (111) which are correspondingly arranged with the mooring chains (2) in a penetrating way;

the crane (102) pulls a plurality of mooring chains (2) and is matched with a platform ballast system, so that the semi-submersible platform (1) reaches the design draft and is tensioned, and the set pre-tightening force between the mooring chains (2) and the semi-submersible platform (1) is reached.

2. The method for connecting a floating wind turbine and a mooring chain according to claim 1, wherein connecting the crane (102) to the mooring chain (2) comprises:

firstly, a traction steel wire rope (103) and a switching steel wire rope (104) are arranged on the crane (102), then one end, departing from the crane (102), of the traction steel wire rope (103) penetrates through the chain stopper (111) to be connected with the traction end of the mooring chain (2), and the crane (102) pulls the traction steel wire rope (103) to drive the traction end of the mooring chain (2) to reach an appointed position;

separating the traction steel wire rope (103) from the traction end of the mooring chain (2), connecting the switching steel wire rope (104) with the traction end of the mooring chain (2), and drawing the switching steel wire rope (104) by the crane (102) to drive the mooring chain (2) to tighten the semi-submersible platform (1).

3. The construction method for connecting the floating wind turbine and the mooring chain as claimed in claim 2, wherein before the towing steel cable (103) is connected with the towing end of the mooring chain (2), one end of a transition steel cable (105) is connected with the towing end of the mooring chain (2), the other end of the transition steel cable (105) is connected with the end of the towing steel cable (103) away from the crane (102), and then the crane (102) is enabled to pull the towing steel cable (103) to drive the transition steel cable (105) to pass through the chain stopper (111);

and then separating the traction steel wire rope (103) from the transition steel wire rope (105), connecting one end of the switching steel wire rope (104) departing from the crane (102) with the transition steel wire rope (105), and drawing the switching steel wire rope (104) by the crane (102) to tighten the mooring chain (2) through the transition steel wire rope (105).

4. The construction method for connecting the floating wind turbine and the mooring chain according to claim 2, wherein a small hook (1021) and a large hook (1022) are arranged on the crane (102), the small hook (1021) is connected with the hauling cable (103), and the large hook (1022) is connected with the transfer cable (104).

5. The construction method for connecting the floating wind turbine and the mooring chain according to claim 1, characterized in that after the mooring chain (2) is laid, a temporary buoy (3) is arranged on the mooring chain (2), and the temporary buoy (3) can mark the position of the mooring chain (2).

6. The construction method for connecting the floating wind turbine and the mooring chain according to claim 3, wherein the transition steel wire rope (105) and the traction end of the mooring chain (2), the transition steel wire rope (105) and the traction steel wire rope (103), and the transition steel wire rope (105) and the transfer steel wire rope (104) are connected by using shackles (106).

7. The construction method for connecting the floating wind turbine and the mooring chain according to claim 1, wherein a chain guide wheel (112) corresponding to the chain stopper (111) is further arranged on the semi-submersible platform (1), and the traction end of the mooring chain (2) sequentially passes through the chain guide wheel (112) and the chain stopper (111).

8. The construction method for connecting the floating fan and the mooring chain as claimed in claim 1, wherein the semi-submersible platform (1) comprises three columns (11) connected with each other, each column (11) is provided with three chain stoppers (111), and the three chain stoppers (111) on each column (11) are respectively penetrated by three mooring chains (2).

9. The construction method for connecting a floating wind turbine and a mooring chain as claimed in any one of claims 1-8, wherein when the crane (102) pulls the mooring chain (2), the design draft of the semi-submersible platform (1) is adjusted and the mooring chain (2) is tensioned by pulling a plurality of mooring chains (2) in sequence and then matching with the platform ballast system.

10. Construction method of a floating fan and mooring chain connection according to any of claims 1-8, characterized in that the platform ballast system is a water ballast system, the draft of the semi-submersible (1) being adjusted by adding water in the semi-submersible (1).

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