Opposite-pulling installation device and opposite-pulling method for marine dragging anchor

Abstract

The invention relates to an offshore dragging anchor opposite-pulling installation device which comprises a tensioner, a driving chain assembly and a driven chain assembly, the tensioner comprises a body, a driving chain connecting assembly and a driven chain connecting assembly, the driving chain connecting assembly and the driven chain connecting assembly are arranged at the two ends of the body, and an anchor chain hole is formed in the body; the anchor chain hole penetrates through the top and the bottom of the body, an anchor chain channel is arranged at the bottom of the body, an anchor chain fixer is arranged at the joint of the anchor chain channel and the anchor chain hole, the upper section of the driving chain penetrates through the anchor chain hole in the top of the body to be connected with an installation ship, and the lower section of the driving chain penetrates through the anchor chain hole in the bottom of the body to be arranged in the anchor chain channel. The lower section of the driving chain and the anchor chain fixing device achieve locking or unlocking, one end of the driven chain assembly is connected with the driven chain connecting set, and the tail end of the lower section of the driving chain and the tail end of the other end of the driven chain assembly are connected with the dragging anchor. The device is used for multi-anchor opposite-pulling installation of the towing anchor, the efficiency of installation and load verification of the towing anchor can be improved, and the installation and test cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of mooring equipment for ocean engineering, and particularly to an offshore dragging anchor tensioning installation device and a tensioning method. Background Art

[0002] The mooring system is the key to maintaining the stability of ocean floating structures. By using anchor chains, cables, etc., the floating structures are fixed at designated sea area positions, enabling them to maintain a relatively stable position and attitude under environmental loads. It is widely used in construction projects such as offshore oil and gas exploitation and offshore wind power generation. With the advancement of ocean resource development towards deeper and farther sea areas, new requirements have been put forward for the performance and reliability of the mooring system.

[0003] The installation and load verification of the anchor are two important stages in the installation of the mooring system. The installation of the anchor is to install the anchor and related equipment in the seabed according to the design requirements. The load verification is a kind of loading test to check the safe operation of the anchor under specific conditions, ensuring that the mooring system will not be damaged or fail when bearing the expected external forces during actual use. In the traditional mooring system installation, under a relatively high design load of the mooring system, both the installation and load verification of the anchor pose high requirements for the working load of the installation ship or installation equipment, resulting in high installation and testing costs. For a multi-point mooring system, the installation and load verification of the anchor need to be carried out at each anchoring point, and the operation efficiency is low.

[0004] Therefore, there is an urgent need for an offshore dragging anchor tensioning installation device and a tensioning method. Summary of the Invention

[0005] The present invention provides an offshore dragging anchor tensioning installation device and a tensioning method, which can solve the technical problems of high installation and testing costs and low efficiency in the traditional mooring installation process.

[0006] The first aspect of the present invention provides an offshore dragging anchor tensioning installation device, including a tensioner, an active chain, and a passive chain assembly. The tensioner includes a body, an active chain connection component, and a passive chain connection component. The active chain connection component and the passive chain connection component are arranged at both ends of the body. The body is provided with an anchor chain hole, which penetrates the top and the bottom of the body. The bottom of the body is provided with an anchor chain channel. An anchor chain fixator is provided at the connection between the anchor chain channel and the anchor chain hole. The upper section of the active chain passes through the anchor chain hole at the top of the body and is connected to the installation ship. The lower section of the active chain passes through the anchor chain hole at the bottom of the body and is arranged in the anchor chain channel, and the lower section of the active chain and the anchor chain fixator can be locked or unlocked. One end of the passive chain assembly is connected to the passive chain connection group. The end of the lower section of the active chain and the end of the other end of the passive chain assembly are respectively connected to the dragging anchor.

[0007] For the described offshore drag anchor pulling and installing device, preferably, the active chain connection assembly includes a release handle, a hook ring mounting hole, and a release wire. The release handle is arranged at one end of the body, and the release handle and the body are integrally formed by welding or injection molding. The hook ring mounting hole is provided on the release handle, one end of the release wire is connected to the hook ring mounting hole, and the other end of the release wire is connected to the installation ship.

[0008] For the described offshore drag anchor pulling and installing device, preferably, the active chain connection assembly includes a release handle, a hook ring mounting hole, a hook ring, and a release wire. The release handle is arranged at one end of the body, and the release handle and the body are integrally formed by welding or injection molding. The hook ring mounting hole is provided on the release handle, the hook ring is arranged in the hook ring mounting hole, one end of the release wire is connected to the hook ring, and the other end of the release wire is connected to the installation ship.

[0009] For the described offshore drag anchor pulling and installing device, preferably, the passive chain connection assembly includes a connection groove, a connection pin mounting hole, and a connection pin. The connection groove is opened at the other end of the body, the connection pin mounting hole is provided on the side wall of the connection groove, the connection pin is arranged in the connection pin mounting hole, and the passive chain assembly is connected to the connection pin.

[0010] For the described offshore drag anchor pulling and installing device, preferably, the passive chain assembly includes a tensioner connection ring and an anchor chain section. One end of the anchor chain section is connected to the connection pin through the tensioner connection ring, and the other end of the anchor chain section is connected to the drag anchor.

[0011] For the described offshore drag anchor pulling and installing device, preferably, the passive chain assembly includes a tensioner connection ring, an anchor chain section, a first passive chain fork, a second passive chain fork, and a triangular plate. Triangular plate holes are provided at three end points of the triangular plate. One end of the anchor chain section, one end of the first passive chain fork, and one end of the second passive chain fork are respectively arranged in the three triangular plate holes. The other end of the anchor chain section is connected to the connection pin through the tensioner connection ring, and the other ends of the first passive chain fork and the second passive chain fork are respectively connected to the drag anchor.

[0012] For the described offshore drag anchor pulling and installing device, preferably, triangular plate connection pins are further provided on the triangular plate holes, and the anchor chain section, the first passive chain fork, and the second passive chain fork are respectively arranged in the triangular plate holes through the triangular plate connection pins.

[0013] For the described offshore drag anchor pulling and installing device, preferably, the connection pin and the triangular plate connection pin are respectively pins embedded with strain gauges or sensors, or pins without strain gauges or sensors.

[0014] The second aspect of the present invention provides a method for pulling two towing anchors at sea, including the above-mentioned installation device for pulling two towing anchors at sea, and the method includes the following steps: When installing the towing anchor and / or verifying the load, pass the lower section of the active chain through the anchor chain hole of the tensioner, connect the passive chain to the tensioner, and connect the lower section of the active chain and the passive chain to the towing anchor respectively at one end far from the tensioner. The installation ship lifts the upper section of the active chain. The movement of the lower section of the active chain is blocked by the body of the tensioner and is embedded into the anchor chain fixator to achieve locking, so that the whole formed by the tensioner, the active chain and the passive chain follows the lifting of the upper section of the active chain. The active chain and the passive chain apply tensile forces to the towing anchors connected to them respectively, and the towing anchors move in the direction of the tensioner under the action of the tensile forces and are embedded into the soil for installation at the same time. The installation ship gently lifts the release line to lift the body of the tensioner on one side of the active chain, so that the anchor chain fixator disengages from the lower section of the active chain to achieve unlocking. The tensile forces on the active chain and the passive chain are released, and the towing anchor stops moving. After unlocking, the tensioner descends by relying on its own weight or with the assistance of the installation ship, so that the lower section of the active chain transitions to the upper section of the active chain until the active chain and the passive chain are horizontally laid on the seabed. Repeat the process of lifting the upper section of the active chain to achieve locking and the overall movement of the tensioner, the active chain and the passive chain, gently lifting the release line to achieve unlocking, and the tensioner descending to make the active chain and the passive chain horizontally laid on the seabed, so as to realize the step-by-step movement and soil embedding of the towing anchor with the successive lifting of the tensioner, and finally complete the installation and / or load verification of the towing anchor.

[0015] The third aspect of the present invention provides a method for pulling two towing anchors at sea, including the above-mentioned installation device for pulling two towing anchors at sea, and the method includes the following steps: When installing the towing anchor and / or verifying the load, pass the lower section of the active chain through the anchor chain hole of the tensioner, connect one end of the anchor chain section to the tensioner, connect the other end of the anchor chain section, one end of the first passive chain fork and one end of the second passive chain fork to the triangular plate respectively, and connect the lower section of the active chain, the other end of the first passive chain fork and the other end of the second passive chain fork to the towing anchor. The installation vessel lifts the upper section of the active chain. The movement of the lower section of the active chain is blocked by the body of the tensioner from being embedded into the anchor chain fixator to achieve locking, so that the whole formed by the tensioner, the active chain, the anchor chain section, the first passive chain fork and the second passive chain fork follows the lifting of the upper section of the active chain. The active chain, the first passive chain fork and the second passive chain fork apply tensile forces to their respective connected drag anchors. While moving in the direction of the tensioner under the action of the tensile force, the drag anchors are embedded into the soil for installation. The installation vessel gently lifts the release line to lift the body of the tensioner on one side of the active chain, so that the anchor chain fixator is disengaged from the lower section of the active chain to achieve unlocking. The tensile forces on the active chain, the anchor chain section, the first passive chain fork and the second passive chain fork are released, and the drag anchors stop moving. After unlocking, the tensioner descends by relying on its own weight or with the assistance of the installation vessel, so that the lower section of the active chain transitions to the upper section of the active chain until the active chain, the anchor chain section, the first passive chain fork and the second passive chain fork are horizontally laid on the seabed. The process of cyclically lifting the upper section of the active chain to achieve locking and the whole movement of the tensioner, the active chain, the anchor chain section, the first passive chain fork and the second passive chain fork, gently lifting the release line to achieve unlocking, and the tensioner descending to horizontally lay the active chain, the anchor chain section, the first passive chain fork and the second passive chain fork on the seabed is carried out to realize the step-by-step movement and soil embedding of the drag anchors with the successive lifting of the tensioner, and finally complete the installation and / or load verification of the drag anchors.

[0016] The beneficial effects are as follows: In the present invention, a tensioner is provided on a mooring chain or cable for the installation and tension adjustment of various types of anchors. By using the principle that a vertical load generates a greater horizontal reaction force on a horizontal cable, when lifting, the active chain is locked to pull up the mooring chain to pull the anchor legs inward, and when descending, the chain is slackened to allow the active chain to pass through the tensioner to maintain a horizontal tension state for the next lift. Such cyclic operation is carried out to finally apply a load on the anchor for embedding installation and verification loading. In a symmetric mooring mode, two opposite anchor legs can be tensioned simultaneously; when the mooring chains or cables are equally spaced, triangular plates can be installed on the side of the passive chain to achieve the installation of three-anchor pulling against each other.

[0017] The present invention reduces the number of operations, can save the overall installation time, and improves the operation efficiency of the mooring system installation. In addition, applying a vertical load by a crane or a winch is easier to control than the load pulled by a bollard. This load is lower than the horizontal pre-tension load, which reduces the requirements for the ship and the lifting device in the mooring system installation and testing and saves the installation cost.

[0018] In the present invention, a tensioner is provided on the anchor chain. With the cooperation of the anchor chain hole and the anchor chain fixator, the anchors of the mooring system are respectively set as the active anchor and the passive anchor according to the active chain and the passive chain. Among them, according to the mooring mode, the passive anchor can be a single anchor or a double anchor, corresponding to a single-anchor or asymmetric mooring system, a symmetric mooring system, and an equidistant mooring system respectively. During lifting, the active anchor is locked by the anchor chain fixator, and the tensioner and the like follow the lifting, converting the vertical load applied on the active anchor into a horizontal load and applying it on the anchor; during lowering, the active chain is unlocked, and the tensioner descends until the active chain and the passive chain are parallel to the sea level. By repeating the cycle of lifting and lowering, the embedding installation or verification loading of the anchor is finally achieved. Through the setting of the offshore towing anchor pulling and installing device, the operation efficiency of anchor installation or verification loading can be improved. At the same time, the stable vertical load applied generates a greater horizontal reaction force on the horizontal cable, thereby reducing the dependence on large lifting equipment and ships during the operation process. Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the offshore towing anchor pulling and installing device in Embodiment 1 of the present invention; Figure 2 is the structural schematic diagram of the tensioner from the first perspective; Figure 3 is the structural schematic diagram of the tensioner from the second perspective; Figure 4 is the cooperation schematic diagram of the tensioner and the anchor chain; Figure 5 is the overall structural schematic diagram of the offshore towing anchor pulling and installing device in Embodiment 2 of the present invention; Figure 6 is the structural schematic diagram of the triangular plate and the passive chain assembly.

[0020] In the figure: 1. Tensioner; 11. Tensioner connection ring; 21. Upper section of the active chain; 22. Lower section of the active chain; 3. Anchor chain section; 4. Shackle; 5. Release line; 6. Connecting pin; 7. Triangular plate; 71. Triangular plate surface; 72. Triangular plate lifting hole; 701. Triangular plate hole; 702. Triangular plate connecting pin; 8. First passive chain fork; 9. Second passive chain fork; 10. Anchor chain fixator; 11. Release handle; 12. Shackle mounting hole; 13. Mounting threaded hole; 14. Connecting pin mounting hole; 15. Connecting groove; 16. Anchor chain hole; 17. Anchor chain channel. Detailed Embodiments To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the above components. Without additional statements, the above terms have no special meanings and should not be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "setting" and "connection" 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 a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] An off - shore dragging anchor opposed - pulling installation device provided by the present invention includes a tensioner, a driving chain and a driven chain assembly. The tensioner includes a body, a driving - chain connection assembly and a driven - chain connection assembly. The driving - chain connection assembly and the driven - chain connection assembly are arranged at both ends of the body. The body is provided with a chain hole which penetrates through the top and the bottom of the body. An anchor - chain channel is arranged at the bottom of the body. An anchor - chain fixer is arranged at the connection of the anchor - chain channel and the anchor - chain hole. The upper section of the driving chain passes through the anchor - chain hole at the top of the body and is connected to an installation ship. The lower section of the driving chain passes through the anchor - chain hole at the bottom of the body and is arranged in the anchor - chain channel, and the lower section of the driving chain and the anchor - chain fixer can be locked or unlocked. One end of the driven - chain assembly is connected to the driven - chain connection group. The end of the lower section of the driving chain and the end of the other end of the driven - chain assembly are respectively connected to a dragging anchor. The present invention is used for the opposed - pulling installation of multiple dragging anchors, and can improve the efficiency of lifting the installation and load verification of the dragging anchor, and save the installation and test costs.

[0024] The following takes an off - shore dragging anchor opposed - pulling installation device as an example to elaborate the entire technical process in detail.

[0025] Example 1 As shown Figures 1 to 4 in the figure, a marine towing anchor pulling and installing device includes a tensioner 1, an active chain and a passive chain assembly. The tensioner 1 includes a body, an active chain connection assembly and a passive chain connection assembly. The active chain connection assembly and the passive chain connection assembly are arranged at both ends of the body. An anchor chain hole 16 is provided on the body. The anchor chain hole 16 penetrates through the top and the bottom of the body. An anchor chain channel 17 is provided at the bottom of the body. An anchor chain fixator 10 is provided at the connection between the anchor chain channel 17 and the anchor chain hole 16. The upper section 21 of the active chain passes through the anchor chain hole 16 at the top of the body and is connected to the installation ship. The lower section 22 of the active chain passes through the anchor chain hole 16 at the bottom of the body and is arranged in the anchor chain channel 17, and the lower section 22 of the active chain is locked with the anchor chain fixator 10. One end of the passive chain assembly is connected to the passive chain connection group. The end of the lower section 22 of the active chain and the end of the other end of the passive chain assembly are respectively connected to the towing anchor.

[0026] Among them, the anchor chain hole 16 is in the shape of a cross hole, and the bottom of the anchor chain hole 16 is formed to be the anchor chain channel 17. The reason for setting the anchor chain hole 16 like this instead of directly forming a square or circular hole channel is that on the one hand, it is to save space and avoid the reduction of the bearing capacity due to too large holes on the tensioner 1. At the same time, as shown Figure 4 in the figure, the lower section 22 of the active chain can pass through normally. On the other hand, it is for the convenience of installing the anchor chain fixator 10.

[0027] As shown Figure 2 in the figure, a plurality of installation threaded holes 13 are provided on the surface of the tensioner 1. In this Example 1, the reason for setting it like this instead of making the surface of the tensioner 1 continuous is that during processing, the tensioner 1 is processed in two halves. During installation, the tensioner 1 can be assembled by installing bolts on the installation threaded holes 13.

[0028] As shown Figure 4 in the figure, the upper section 21 of the active chain passes through the anchor chain hole 16 and gradually transitions to the lower section 22 of the active chain at the turning point along the anchor chain channel 17. An anchor chain fixator 10 is provided on the anchor chain channel 17 at the turning point. The anchor chain fixator 10 is a symmetric columnar protrusion fixed on the anchor chain channel 17. The anchor chain channel 17 and the anchor chain fixator 10 are welded. The reason for setting it like this instead of using a smooth anchor chain channel 17 is to lock the lower section 22 of the active chain during the lifting stage of the tensioner 1. The installation ship gently lifts the release line 5, so that the body of the tensioner 1 is lifted on one side of the active chain, so that the anchor chain fixator 10 is disengaged from the lower section 22 of the active chain, realizing unlocking and realizing the transition of the lower section 22 of the active chain to the upper section 21 of the active chain.

[0029] As shown Figure 2 and Figure 3As shown, the active chain connection component includes a release handle 11, a hook ring mounting hole 12, and a release wire 5. The release handle 11 is provided at one end of the body, and the release handle 11 and the body are integrally formed by welding or injection molding. The release handle 11 is provided with a hook ring mounting hole 12. One end of the release wire 5 is connected to the hook ring mounting hole 12, and the other end of the release wire 5 is connected to the installation boat.

[0030] Among them, a measurement pin mounting hole 14 is opened on the measurement groove 15. This is set in this way instead of forming a handle-like structure similar to the release handle 11. On the one hand, it is to facilitate the installation of the connection pin 6, and on the other hand, it is to facilitate the installation of the tensioner link ring 31.

[0031] Furthermore, the tensioner 1, the release handle 11, and the measurement groove 15 are integrally formed by welding or injection molding to ensure that the tensioner 1 has sufficient strength during operation, avoid deformation of the surface of the tensioner 1 due to seawater pressure, and extend the service life of the tensioner 1.

[0032] The surface of the tensioner 1 can be coated with an anti-corrosion spray layer or painted to reduce the corrosion of the tensioner 1 in the seawater environment and extend the service life of the tensioner 1.

[0033] As Figure 2 、 Figure 3 and Figure 4 shown, the active chain connection component includes a release handle 11, a hook ring mounting hole 12, a hook ring 4, and a release wire 5. The release handle 11 is provided at one end of the body, and the release handle 11 and the body are integrally formed by welding or injection molding. The release handle 11 is provided with a hook ring mounting hole 12. A hook ring 4 is provided in the hook ring mounting hole 12. One end of the release wire 5 is connected to the hook ring 4, and the other end of the release wire 5 is connected to the installation boat.

[0034] As Figure 4 shown, the passive chain connection component includes a connection groove 15, a connection pin mounting hole 14, and a connection pin 6. The connection groove 15 is opened at the other end of the body. A connection pin mounting hole 14 is provided on the side wall of the connection groove 15. A connection pin 6 is provided in the connection pin mounting hole 14. The passive chain component is connected to the connection pin 6.

[0035] Among them, the connection pin 6 is a pin embedded with a strain gauge or a sensor, or a pin without a strain gauge or a sensor.

[0036] As Figure 4 shown, the passive chain component includes a tensioner link ring 11 and an anchor chain section 3. One end of the anchor chain section 3 is connected to the connection pin 6 through the tensioner link ring 11, and the other end of the anchor chain section 3 is connected to the towing anchor.

[0037] Among them, the anchor chain section 3 can be any form of mooring chain, such as a mooring rope, a mooring line, or an anchor chain.

[0038] Working process: When installing or verifying the load of the symmetric mooring system, select one of the anchor chains in the symmetric mooring system to pass through the anchor chain channel 17 on the tensioner 1 as the active chain, and install the tensioner connecting ring 11 on the other as the passive chain. After installation, slightly lift to test whether the active chain is locked by the anchor chain fixator 10. After the test is successful, apply a vertical load to the upper section 21 of the active chain. Due to the effect of the anchor chain channel 17, horizontal reaction forces of equal magnitude and opposite directions are generated on the lower section 22 of the active chain and the anchor chain section 3 of the passive chain. At the same time, the overall structure including the tensioner 1, the active chain, and the anchor chain section 3 of the passive chain follows the upper section 21 of the active chain and is lifted to a certain height. During this period, the connecting pin 6 records the tension applied to the anchor chain section 3 of the passive chain. Then, the installation ship lifts and releases the line 5 to drive the shackle 4 to unlock the lower section 22 of the active chain from the anchor chain fixator 10, and the tensioner 1 relies on its own weight or the assistance of the installation ship to descend until the active chain and the passive chain are horizontally laid on the seabed. By repeating the above lifting and lowering operations, a load is finally applied to the symmetric anchors.

[0039] Embodiment 2 As Figure 2 、 Figure 3 、 Figure 5 and Figure 6 shown, an offshore drag anchor pulling and installing device includes a tensioner 1, an active chain, and a passive chain assembly. The tensioner 1 includes a body, an active chain connection assembly, and a passive chain connection assembly. The active chain connection assembly and the passive chain connection assembly are arranged at both ends of the body. The body is provided with an anchor chain hole 16, and the anchor chain hole 16 penetrates the top and the bottom of the body. The bottom of the body is provided with an anchor chain channel 17. An anchor chain fixator 10 is arranged at the connection of the anchor chain channel 17 and the anchor chain hole 16. The upper section 21 of the active chain passes through the anchor chain hole 16 at the top of the body and is connected to the installation ship. The lower section 22 of the active chain passes through the anchor chain hole 16 at the bottom of the body and is arranged in the anchor chain channel 17, and the lower section 22 of the active chain is locked with the anchor chain fixator 10. One end of the passive chain assembly is connected to the passive chain connection group, and the end of the lower section 22 of the active chain and the end of the other end of the passive chain assembly are respectively connected to the drag anchor.

[0040] Among them, the anchor chain hole 16 is in the shape of a cross hole, which is convenient for the installation of the anchor chain fixator 10. The bottom of the anchor chain hole 16 is formed with an anchor chain channel 17.

[0041] As Figure 2 shown, a plurality of installation threaded holes 13 are formed on the surface of the tensioner 1. In this Embodiment 1, the reason for such a setting instead of setting the surface of the tensioner 1 to be continuous is that the tensioner 1 is processed in two halves during processing, and the tensioner 1 can be assembled by installing bolts on the installation threaded holes 13 during installation.

[0042] As Figure 5 shown, the upper section 21 of the active chain passes through the anchor chain hole 16 and gradually transitions into the lower section 22 of the active chain along the anchor chain path 17 at the turning point. An anchor chain fixator 10 is provided on the anchor chain path 17 at the turning point. The anchor chain fixator 10 is a symmetric columnar protrusion fixed on the anchor chain path 17, and the anchor chain path 17 and the anchor chain fixator 10 are welded. This is set up in this way instead of using a smooth anchor chain path 17 in order to lock the lower section 22 of the active chain during the lifting stage of the tensioner 1. During the release stage, the release wire 5 is lifted to drive the hook 4 and the tensioner 1, so that the lower section 22 of the active chain is disengaged from the anchor chain fixator 10, realizing the transition of the lower section 22 of the active chain to the upper section 21 of the active chain.

[0043] Among them, the hook 4 can be set for convenience and can be set in any form, or the hook 4 can be directly omitted and the release wire 5 can be directly connected to the hook mounting hole 12.

[0044] As Figure 2 and Figure 3 shown, the active chain connection assembly includes a release handle 11, a hook mounting hole 12 and a release wire 5. The release handle 11 is provided at one end of the body, and the release handle 11 and the body are integrally formed by welding or injection molding. The release handle 11 is provided with a hook mounting hole 12. One end of the release wire 5 is connected to the hook mounting hole 12, and the other end of the release wire 5 is connected to the mounting boat.

[0045] Among them, the tensioner 1 forms a measurement groove 15, and a measurement pin mounting hole 14 is opened on the measurement groove 15. This is set up in this way instead of forming a handle-like structure similar to the release handle 11. On the one hand, it is for the convenience of installing the connection pin 6, and on the other hand, it is for the convenience of installing the tensioner link 31.

[0046] As Figure 2 , Figure 3 and Figure 5 shown, the active chain connection assembly includes a release handle 11, a hook mounting hole 12, a hook 4 and a release wire 5. The release handle 11 is provided at one end of the body, and the release handle 11 and the body are integrally formed by welding or injection molding. The release handle 11 is provided with a hook mounting hole 12, and a hook 4 is provided in the hook mounting hole 12. One end of the release wire 5 is connected to the hook 4, and the other end of the release wire 5 is connected to the mounting boat.

[0047] As Figure 3 and Figure 5 shown, the passive chain connection assembly includes a connection groove 15, a connection pin mounting hole 14 and a connection pin 6. The connection groove 15 is opened at the other end of the body. A connection pin mounting hole 14 is provided on the side wall of the connection groove 15, and a connection pin 6 is provided in the connection pin mounting hole 14. The passive chain assembly is connected to the connection pin 6.

[0048] Among them, the connecting pin 6 is a pin for embedding a strain gauge or a sensor, or a pin without a strain gauge or a sensor.

[0049] As Figure 5 and Figure 6 shown, the passive chain assembly includes a tensioner connection ring 11, a mooring chain section 3, a first passive chain fork 8, a second passive chain fork 9, and a triangular plate 7. Triangular plate holes 701 are provided at three end points of the triangular plate 7. One end of the mooring chain section 3, one end of the first passive chain fork 8, and one end of the second passive chain fork 9 are respectively arranged in the three triangular plate holes 701. The other end of the mooring chain section 3 is connected to the connecting pin 6 through the tensioner connection ring 11. The other ends of the first passive chain fork 8 and the second passive chain fork 9 are respectively connected to the towing anchor.

[0050] Among them, the mooring chain section 3 can be any form of mooring chain, such as a mooring rope, a mooring line, or an anchor chain.

[0051] Among them, the triangular plate 7 is formed by one or two triangular plate surfaces 71.

[0052] Among them, a triangular plate lifting hole 72 is provided on the triangular plate 7. The reason for such a setting instead of a continuous entity is similar to the function of the installation threaded hole 13, which is to ensure convenient installation in the case of two triangular plate surfaces 71.

[0053] As Figure 5 and Figure 6 shown, a triangular plate connecting pin 702 is further provided on the triangular plate hole 701. The mooring chain section 3, the first passive chain fork 8, and the second passive chain fork 9 are respectively arranged in the triangular plate hole 701 through the triangular plate connecting pin 702.

[0054] Specifically, when there is no force measurement requirement, both the connecting pin 6 and the triangular plate connecting pin 702 are pins without a strain gauge or a sensor.

[0055] When there is a force measurement requirement, the positions where the pins embedded with strain gauges or sensors are distributed are as follows: 1. Only set on the connecting pin 6; 2. Set on the triangular plate connecting pin 702 connected to the first passive chain fork 8 or the triangular plate connecting pin 702 connected to the second passive chain fork 9; 3. Set on the connecting pin 6 and the triangular plate connecting pin 702 connected to the first passive chain fork 8 at the same time; 4. Set on the connecting pin 6 and the triangular plate connecting pin 702 connected to the second passive chain fork 9 at the same time; 5. Set on the connecting pin 6, the triangular plate connecting pin 702 connected to the first passive chain fork 8, and the triangular plate connecting pin 702 connected to the second passive chain fork 9 at the same time.

[0056] Figure 6 The triangular plate 7 in it is in the mode of two symmetrical triangular plate surfaces 71. However, according to actual needs, a single plate can be adopted, and the triangular plate connecting pin 702 can be not provided, and the first passive link fork 8 and the second passive link fork 9 can be directly connected to the triangular plate lifting hole 701.

[0057] Embodiment 3 A method for pulling two sea - dragging anchors against each other, including the sea - dragging anchor pulling and installing device described in Embodiment 1, comprises the following steps: Step S1: When installing and / or verifying the load of the dragging anchor, pass the lower section 22 of the active chain through the anchor chain hole 16 of the tensioner 1, connect the passive chain to the tensioner 1, and connect a dragging anchor to each of the far - away - from - the - tensioner - 1 ends of the lower section 22 of the active chain and the passive chain. Step S2: The installation ship lifts the upper section 21 of the active chain. The movement of the lower section 22 of the active chain is blocked by the body of the tensioner 1 and is embedded into the anchor chain fixer 10 to achieve locking, so that the whole formed by the tensioner 1, the active chain and the passive chain follows the lifting of the upper section 21 of the active chain. The active chain and the passive chain apply tensile forces to their respective connected dragging anchors, and the dragging anchors move towards the direction where the tensioner 1 is located under the action of the tensile forces and are embedded into the soil for installation at the same time. Step S3: The installation ship gently lifts the release line 5 to lift the body of the tensioner 1 on one side of the active chain, so that the anchor chain fixer 10 is disengaged from the lower section 22 of the active chain to achieve unlocking. The tensile forces on the active chain and the passive chain are released, and the dragging anchors stop moving. Step S4: After unlocking, the tensioner 1 descends by relying on its own weight or with the assistance of the installation ship, so that the lower section 22 of the active chain transitions to the upper section 21 of the active chain until the active chain and the passive chain are horizontally laid on the seabed. Step S5: Repeat the process of lifting the upper section 21 of the active chain in Step S2 to achieve locking and the overall movement of the tensioner 1, the active chain and the passive chain, gently lifting the release line 5 in Step S3 to achieve unlocking, and the tensioner 1 descending in Step S4 to horizontally lay the active chain and the passive chain on the seabed, so as to realize the step - by - step movement and soil - embedding of the dragging anchors following the successive lifting of the tensioner 1, and finally complete the installation and / or load verification of the dragging anchors.

[0058] Embodiment 4 A method for pulling two sea - dragging anchors against each other, including the sea - dragging anchor pulling and installing device described in Embodiment 2, comprises the following steps: Step S1: When installing the drag anchor and / or verifying the load, pass the lower section 22 of the active chain through the anchor chain hole 16 of the tensioner 1. Connect one end of the anchor chain section 3 to the tensioner 1. Connect the other end of the anchor chain section 3, one end of the first passive chain fork 8, and one end of the second passive chain fork 9 to the triangular plate respectively. Connect the lower section 22 of the active chain, the other end of the first passive chain fork 8, and the other end of the second passive chain fork 9 to the drag anchor.

[0059] Step S2: The installation vessel lifts the upper section 21 of the active chain. The movement of the lower section 22 of the active chain is blocked by the body of the tensioner 1 and is embedded in the anchor chain fixator 10 to achieve locking, so that the whole formed by the tensioner 1, the active chain, the anchor chain section 3, the first passive chain fork 8, and the second passive chain fork 9 follows the lifting of the upper section 21 of the active chain. The active chain, the first passive chain fork 8, and the second passive chain fork 9 apply tensile forces to the respective connected drag anchors. While the drag anchors move in the direction of the tensioner 1 under the action of the tensile forces, they are embedded in the soil for installation.

[0060] Step S3: The installation vessel gently lifts the release line 5, so that the body of the tensioner 10 is lifted on one side of the active chain, thereby disengaging the anchor chain fixator 10 from the lower section 22 of the active chain to achieve unlocking. The tensile forces on the active chain, the anchor chain section 3, the first passive chain fork 8, and the second passive chain fork 9 are released, and the drag anchors stop moving; Step S4: After unlocking, the tensioner 1 descends by its own weight or with the assistance of the installation vessel, so that the lower section 22 of the active chain transitions to the upper section 21 of the active chain until the active chain, the anchor chain section 3, the first passive chain fork 8, and the second passive chain fork 9 are horizontally laid on the seabed. Step S5: Repeat the process of lifting the upper section 21 of the active chain to achieve locking and the whole formed by the tensioner 1, the active chain, the anchor chain section, the first passive chain fork 8, and the second passive chain fork 9 moves, gently lifting the release line 5 to achieve unlocking, and the tensioner 10 descending to horizontally lay the active chain, the anchor chain section, the first passive chain fork 8, and the second passive chain fork 9 on the seabed, so as to achieve the drag anchors moving and being embedded in the soil section by section with the successive lifting of the tensioner 1, and finally complete the installation and / or load verification of the drag anchors.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An offshore drag anchor pair-pulling installation device, characterized in that It includes a tensioner, an active chain and a passive chain assembly. The tensioner includes a body, an active chain connection assembly and a passive chain connection assembly. The active chain connection assembly and the passive chain connection assembly are arranged at both ends of the body. There is an anchor chain hole on the body, and the anchor chain hole penetrates through the top and the bottom of the body. There is an anchor chain channel at the bottom of the body, and an anchor chain fixator is provided at the connection between the anchor chain channel and the anchor chain hole. The upper section of the active chain passes through the anchor chain hole at the top of the body and is connected to the installation ship. The lower section of the active chain passes through the anchor chain hole at the bottom of the body and is arranged in the anchor chain channel, and the lower section of the active chain and the anchor chain fixator can be locked or unlocked. One end of the passive chain assembly is connected to the passive chain connection group, and the ends of the lower section of the active chain and the other end of the passive chain assembly are respectively connected to the drag anchor.

2. The offshore drag anchor pair-pulling installation device according to claim 1, characterized in that, The active chain connection assembly includes a release handle, a shackle mounting hole and a release wire. The release handle is arranged at one end of the body, and the release handle and the body are integrally formed by welding or injection molding. The shackle mounting hole is provided on the release handle, one end of the release wire is connected to the shackle mounting hole, and the other end of the release wire is connected to the installation ship.

3. The offshore drag anchor tension installation device according to claim 1, characterized in that, The active chain connection assembly includes a release handle, a shackle mounting hole, a shackle and a release wire. The release handle is arranged at one end of the body, and the release handle and the body are integrally formed by welding or injection molding. The shackle mounting hole is provided on the release handle, the shackle is arranged in the shackle mounting hole, one end of the release wire is connected to the shackle, and the other end of the release wire is connected to the installation ship.

4. The offshore drag anchor pull-and-pull installation device according to claim 2 or 3, characterized in that, The passive chain connection assembly includes a connection groove, a connection pin mounting hole and a connection pin. The connection groove is opened at the other end of the body, the connection pin mounting hole is provided on the side wall of the connection groove, the connection pin is arranged in the connection pin mounting hole, and the passive chain assembly is connected to the connection pin.

5. The offshore drag anchor pulling and installing device according to claim 4, wherein The passive chain assembly includes a tensioner connection ring and an anchor chain section. One end of the anchor chain section is connected to the connection pin through the tensioner connection ring, and the other end of the anchor chain section is connected to the drag anchor.

6. The offshore drag anchor tension installation device according to claim 5, characterized in that, The passive chain assembly includes a tensioner connection ring, an anchor chain section, a first passive chain fork, a second passive chain fork and a triangular plate. Triangular plate holes are provided at three end points of the triangular plate. One end of the anchor chain section, one end of the first passive chain fork and one end of the second passive chain fork are respectively arranged in the three triangular plate holes. The other end of the anchor chain section is connected to the connection pin through the tensioner connection ring, and the other ends of the first passive chain fork and the second passive chain fork are respectively connected to the drag anchor.

7. The offshore drag anchor tension installation device according to claim 6, characterized in that, Triangular plate connection pins are also provided on the triangular plate holes, and the anchor chain section, the first passive chain fork and the second passive chain fork are respectively arranged in the triangular plate holes through the triangular plate connection pins.

8. The offshore drag anchor opposed-pulling installation device according to claim 7, characterized in that, The connection pin and the triangular plate connection pin are respectively pins embedded with strain gauges or sensors, or pins without strain gauges or sensors.

9. A method for pulling two sea towed anchors against each other, characterized in that, Including the offshore drag anchor pulling and installing device according to any one of claims 1 to 8, the method includes the following steps: During the installation and / or load verification of the drag anchor, pass the lower section of the active chain through the anchor chain hole of the tensioner, connect the passive chain to the tensioner, and connect the lower section of the active chain and the passive chain to the drag anchor at one end far from the tensioner respectively; The installation ship lifts the upper section of the active chain. The movement of the lower section of the active chain is blocked by the body of the tensioner and is embedded into the anchor chain fixator to achieve locking, so that the whole formed by the tensioner, the active chain and the passive chain follows the lifting of the upper section of the active chain. The active chain and the passive chain apply tensile forces to the drag anchors connected to them respectively. While the drag anchors move in the direction of the tensioner under the action of the tensile forces, they are embedded into the soil for installation; The installation ship gently lifts the release line to lift the body of the tensioner on one side of the active chain, so that the anchor chain fixator disengages from the lower section of the active chain to achieve unlocking. The tensile forces on the active chain and the passive chain are released, and the drag anchors stop moving; after unlocking, the tensioner descends by relying on its own weight or with the assistance of the installation ship, so that the lower section of the active chain transitions to the upper section of the active chain until the active chain and the passive chain are horizontally laid on the seabed; Repeat the process of lifting the upper section of the active chain to achieve locking and the overall movement of the whole formed by the tensioner, the active chain and the passive chain, gently lifting the release line to achieve unlocking, and the tensioner descending to make the active chain and the passive chain horizontally laid on the seabed, so as to realize the step-by-step movement and soil embedding of the drag anchors following the successive lifting of the tensioner, and finally complete the installation and / or load verification of the drag anchors.

10. A method for pulling two sea-dragging anchors against each other, characterized in that, Including the offshore drag anchor pulling and installing device according to claim 7 or 8, the method includes the following steps: During the installation and / or load verification of the drag anchor, pass the lower section of the active chain through the anchor chain hole of the tensioner, connect one end of the anchor chain section to the tensioner, connect the other end of the anchor chain section, one end of the first passive chain fork and one end of the second passive chain fork to the triangular plate respectively, and connect the lower section of the active chain, the other end of the first passive chain fork and the other end of the second passive chain fork to the drag anchor; The installation ship lifts the upper section of the active chain. The movement of the lower section of the active chain is blocked by the body of the tensioner and is embedded into the anchor chain fixator to achieve locking, so that the whole formed by the tensioner, the active chain, the anchor chain section, the first passive chain fork and the second passive chain fork follows the lifting of the upper section of the active chain. The active chain, the first passive chain fork and the second passive chain fork apply tensile forces to the drag anchors connected to them respectively. While the drag anchors move in the direction of the tensioner under the action of the tensile forces, they are embedded into the soil for installation; The installation ship gently lifts the release line to lift the body of the tensioner on one side of the active chain, so that the anchor chain fixator disengages from the lower section of the active chain to achieve unlocking. The tensile forces on the active chain, the anchor chain section, the first passive chain fork and the second passive chain fork are released, and the drag anchors stop moving; After unlocking, the tensioner descends by its own weight or with the assistance of the installation vessel, causing the lower section of the active chain to transition to the upper section of the active chain until the active chain, the anchor chain section, the first passive chain fork, and the second passive chain fork are horizontally laid on the seabed; The process of cyclically lifting the upper section of the active chain to achieve locking, the overall movement of the tensioner, the active chain, the anchor chain section, the first passive chain fork, and the second passive chain fork, gently lifting the release line to achieve unlocking, and the tensioner descending to horizontally lay the active chain, the anchor chain section, the first passive chain fork, and the second passive chain fork on the seabed is carried out to enable the drag anchor to move and embed into the soil section by section as the tensioner is successively lifted, ultimately completing the installation and / or load verification of the drag anchor.

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