阅读说明：本技术 在隔水套管上安装浮力块的方法 (method for installing buoyancy block on riser ) 是由 王正权 刘明光 杨胜国 田学贵 王富波 刘超 王绍峰 于 2018-06-07 设计创作，主要内容包括：本发明提供了一种在隔水套管上安装浮力块的方法,该方法是先对隔水套管上方的所有的浮力块进行安装,再对隔水套管下方的浮力块进行安装。在安装隔水套管下方的浮力块时,是以隔水套管上方与之相对的浮力块为基准,使隔水套管上下相对的浮力块对接即可,便于控制每对浮力块之间对接的精度,能够有效地保证浮力块在隔水套管上整体的安装精度。此外安装隔水套管下方的浮力时是采用吊装的方式进行,吊装安装能够避免对浮力块毁损,保证浮力块在隔水套管上的安装质量,节约浮力块的安装成本。(The invention provides a method for installing buoyancy blocks on a riser, which is characterized in that all the buoyancy blocks above the riser are installed firstly, and then the buoyancy blocks below the riser are installed. When the buoyancy blocks below the marine riser are installed, the buoyancy blocks above and opposite to the marine riser are used as the reference, and the buoyancy blocks opposite to each other up and down of the marine riser are butted, so that the butting precision of each pair of buoyancy blocks is controlled conveniently, and the integral installation precision of the buoyancy blocks on the marine riser can be effectively guaranteed. In addition, the buoyancy below the marine riser is installed in a hoisting mode, the buoyancy blocks can be prevented from being damaged by hoisting installation, the installation quality of the buoyancy blocks on the marine riser is guaranteed, and the installation cost of the buoyancy blocks is saved.)

1. A method of installing a buoyancy block on a riser, comprising the steps of:

Horizontally supporting a riser on the ground with a space between the riser and the ground;

Sequentially hoisting a plurality of buoyancy blocks to the upper part of the marine riser, and lowering the buoyancy blocks to enable the installation surfaces of the buoyancy blocks to be attached to the outer surface of the marine riser; along the length direction of the marine riser, the end parts of two adjacent buoyancy blocks are abutted;

Placing a plurality of buoyancy blocks below the riser and arranging the buoyancy blocks along the length direction of the riser; and sequentially hoisting the buoyancy blocks below the riser, so that the mounting surfaces of the buoyancy blocks are attached to the outer surface of the riser, and the buoyancy blocks which are opposite to each other up and down of the riser are fixedly connected.

2. The method according to claim 1, wherein a hoisting auxiliary tool is provided, the hoisting auxiliary tool is provided with a pair of oppositely arranged hoisting surfaces, and the two hoisting surfaces can bear the bottom surfaces of two sides of the buoyancy block so as to hoist the buoyancy block to the upper part of the water-resisting casing by matching with hoisting equipment.

3. A method according to claim 2, wherein the direction of extension of the suspension surface coincides with the length direction of the buoyancy block.

4. The method according to claim 1, wherein a bearing tool is provided, the bearing tool is provided with a bearing surface for bearing the buoyancy block, and lifting lugs are symmetrically arranged on two sides of the bearing surface;

Placing the buoyancy block on the bearing surface, and placing the bearing tool below the marine riser; and hoisting equipment is matched with the lifting lugs to hoist the bearing tool, so that the mounting surface of the buoyancy block is attached to the outer surface of the water-resisting casing.

5. The method according to claim 1, characterized in that it further comprises a tightness detection step: after the opposite buoyancy blocks on the marine riser are fixedly connected, the marine riser rotates around the axis of the marine riser, and tightness between the opposite buoyancy blocks on the marine riser is detected; and reinforcing the riser sleeve with unqualified tightness detection, so that the buoyancy blocks opposite to the two sides of the riser sleeve are locked and fixed.

6. The method according to claim 5, wherein a support carousel is provided, said support carousel comprising two support units; each supporting unit comprises a rotating assembly, the rotating assembly can rotate, and the rotating axis of the rotating assembly is consistent with the length direction of the marine riser;

And the two supporting units are respectively supported at two ends of the marine riser and drive the driving assembly to rotate so as to drive the marine riser to rotate along the axis of the marine riser.

7. The method according to claim 1, wherein the buoyancy block installation method further comprises a buoyancy block installation accuracy detection step of: providing a measuring fixture, wherein the measuring fixture is provided with a detection cavity so that the measuring fixture is sleeved on the opposite buoyancy blocks on the water-resisting casing pipe; a plurality of measuring mark points are arranged on the measuring fixture at intervals close to the edge of the detection cavity, and the installation accuracy of the buoyancy block on the water-resisting casing pipe can be detected through the distance between the measuring mark points and the buoyancy block; and the measuring clamp is moved along the length direction of the marine riser, so that the installation accuracy of each buoyancy block can be detected one by one.

8. The method according to claim 7, wherein after the opposite buoyancy blocks on the riser are fixedly connected, the measuring fixture is sleeved on the two opposite buoyancy blocks of the riser, the distance between each measuring mark point and the buoyancy block is measured, and the measuring data is recorded; and comparing the measured data with the standard value, and adjusting the installation size of the buoyancy block on the water-resisting casing pipe for the buoyancy block with unqualified installation precision.

9. The method according to claim 8, characterized in that when the installation accuracy of each buoyancy block is detected, the installation accuracy of one end of each buoyancy block is measured; and moving the measuring clamp along the length direction of the marine riser to measure the installation accuracy of the other end of the buoyancy block.

Technical Field

The invention relates to the field of ocean engineering, in particular to a method for installing a buoyancy block on a riser.

Background

The water-resisting casing pipe is a casing pipe from the bottom of an offshore drilling platform to the seabed, and has the main functions of isolating seawater, forming a circulation channel of drilling fluid and serving as a holding structure of an offshore wellhead. As offshore drilling platforms develop and the drilling depth becomes greater, the strength and safety of the marine riser becomes more prominent. When the riser is used, a plurality of buoyancy blocks need to be installed on the outer surface of the riser, so that the structural strength and the safety of the riser are effectively improved.

Disclosure of Invention

The invention aims to solve the problems that when the method in the prior art is used for installing the buoyancy block on the riser, the installation accuracy of the buoyancy block on the riser is low and the buoyancy block is easy to damage.

In order to solve the technical problem, the invention provides a method for installing a buoyancy block on a riser, which comprises the following steps: horizontally supporting a riser on the ground with a space between the riser and the ground; sequentially hoisting a plurality of buoyancy blocks to the upper part of the marine riser, and lowering the buoyancy blocks to enable the installation surfaces of the buoyancy blocks to be attached to the outer surface of the marine riser; along the length direction of the marine riser, the end parts of two adjacent buoyancy blocks are abutted; placing a plurality of buoyancy blocks below the riser and arranging the buoyancy blocks along the length direction of the riser; and sequentially hoisting the buoyancy blocks below the riser, so that the mounting surfaces of the buoyancy blocks are attached to the outer surface of the riser, and the buoyancy blocks which are opposite to each other up and down of the riser are fixedly connected.

Preferably, a hoisting auxiliary tool is provided, the hoisting auxiliary tool is provided with a pair of hoisting surfaces which are oppositely arranged, and the two hoisting surfaces can bear the bottom surfaces of the two sides of the buoyancy block so as to hoist the buoyancy block to the upper part of the water-resisting casing by matching with hoisting equipment.

Preferably, the extending direction of the hanging surface is consistent with the length direction of the buoyancy block.

Preferably, a bearing tool is provided, the bearing tool is provided with a bearing surface for bearing the buoyancy block, and lifting lugs are symmetrically arranged on two sides of the bearing surface; placing the buoyancy block on the bearing surface, and placing the bearing tool below the marine riser; and hoisting equipment is matched with the lifting lugs to hoist the bearing tool, so that the mounting surface of the buoyancy block is attached to the outer surface of the water-resisting casing.

Preferably, the method further comprises a tightness detection step: after the opposite buoyancy blocks on the marine riser are fixedly connected, the marine riser rotates around the axis of the marine riser, and tightness between the opposite buoyancy blocks on the marine riser is detected; and reinforcing the riser sleeve with unqualified tightness detection, so that the buoyancy blocks opposite to the two sides of the riser sleeve are locked and fixed.

Preferably, a supporting and rotating table is provided, which comprises two supporting units; each supporting unit comprises a rotating assembly, the rotating assembly can rotate, and the rotating axis of the rotating assembly is consistent with the length direction of the marine riser; and the two supporting units are respectively supported at two ends of the marine riser and drive the driving assembly to rotate so as to drive the marine riser to rotate along the axis of the marine riser.

Preferably, the buoyancy block installation method further comprises a buoyancy block installation accuracy detection step of: providing a measuring fixture, wherein the measuring fixture is provided with a detection cavity so that the measuring fixture is sleeved on the opposite buoyancy blocks on the water-resisting casing pipe; a plurality of measuring mark points are arranged on the measuring fixture at intervals close to the edge of the detection cavity, and the installation accuracy of the buoyancy block on the water-resisting casing pipe can be detected through the distance between the measuring mark points and the buoyancy block; and the measuring clamp is moved along the length direction of the marine riser, so that the installation accuracy of each buoyancy block can be detected one by one.

Preferably, after the opposite buoyancy blocks on the riser are fixedly connected, the measuring clamp is sleeved on the two opposite buoyancy blocks of the riser, the distance between each measuring mark point and each buoyancy block is measured, and the measuring data is recorded; and comparing the measured data with the standard value, and adjusting the installation size of the buoyancy block on the water-resisting casing pipe for the buoyancy block with unqualified installation precision.

Preferably, when the installation accuracy of each buoyancy block is detected, the installation accuracy of one end of each buoyancy block is measured; and moving the measuring clamp along the length direction of the marine riser to measure the installation accuracy of the other end of the buoyancy block.

According to the technical scheme, the beneficial effects of the invention are as follows:

In the method for installing the buoyancy blocks on the riser, all the buoyancy blocks above the riser are installed first, and then the buoyancy blocks below the riser are installed. When the buoyancy blocks below the marine riser are installed, the buoyancy blocks above and opposite to the marine riser are used as the reference, and the buoyancy blocks opposite to each other up and down of the marine riser are butted, so that the butting precision of each pair of buoyancy blocks is controlled conveniently, and the integral installation precision of the buoyancy blocks on the marine riser can be effectively guaranteed. In addition, the buoyancy below the marine riser is installed in a hoisting mode, the buoyancy blocks can be prevented from being damaged by hoisting installation, the installation quality of the buoyancy blocks on the marine riser is guaranteed, and the installation cost of the buoyancy blocks is saved.

Drawings

FIG. 1 is a flow chart of an embodiment of the method of installing a buoyancy block on a riser of the present invention.

FIG. 2 is a schematic diagram of a rotary support table according to an embodiment of the method of the present invention.

Fig. 3 is a schematic structural diagram of a supporting unit in an embodiment of the method of the present invention.

Fig. 4 is a schematic structural diagram of the hoisting auxiliary tool in the embodiment of the method of the invention.

Fig. 5 is a schematic view of a hoisting auxiliary tool in an embodiment of the method of the invention.

Fig. 6 is a schematic structural diagram of a load-bearing tool in an embodiment of the method of the present invention.

Fig. 7 is a schematic view of the use states of the bearing tool and the rotary support table in the embodiment of the method of the invention.

Fig. 8 is a schematic view of a use state of a bearing tool in the method embodiment of the present invention.

Fig. 9 is a schematic view of the structure of a measuring fixture in an embodiment of the method of the invention.

Fig. 10 is a schematic structural view of a split jig in an embodiment of the method of the present invention.

FIG. 11 is a schematic view of the use of the measuring fixture in an embodiment of the method of the present invention.

The reference numerals are explained below: 1. a riser pipe; 2. a buoyancy block; 3. supporting the rotating table; 31. a support unit; 311. a support; 312. a rotating wheel; 313. an accommodating space; 32. a drive unit; 4. hoisting an auxiliary tool; 41. a top beam; 411. lifting lugs; 42. a gripper arm mechanism; 421. a first gripper arm; 422. a second gripper arm; 423. a boom; 424. a connecting rod; 43. a gripper mechanism; 431. a gripper; 432. a connecting plate; 433. a carrier plate; 434. hanging the joint surface; 44. a locking mechanism; 441. fixing the rod; 442. locking the screw rod; 443. a lock nut; 45. a stopper unit; 451. a stopper rod; 452. a stopper; 453. a stop nut; 454. a chute; 5. carrying a tool; 51. a bearing table; 511. a bearing surface; 52. a roller; 53. lifting lugs; 54. a wedge-shaped wood block; 6. a sling; 7. measuring a fixture; 71. the fixture is split; 711. a notch; 712. a connecting portion; 713. a straight section; 714. an arc-shaped section; 715. a connecting section; 72. a detection chamber; 73. measuring the mark points; 74. a fastener; 75. and (6) opening holes.

Detailed Description

exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.

Referring to fig. 1, the present application provides a method of installing a buoyancy block 2 on a riser 1, the method comprising the steps of:

step S10, horizontally supporting the riser 1 on the ground, and enabling a gap to be reserved between the riser 1 and the ground;

Step S20, sequentially hoisting a plurality of buoyancy blocks 2 to the upper part of the water-insulation casing 1, and lowering the buoyancy blocks 2 to enable the installation surfaces of the buoyancy blocks 2 to be attached to the outer surface of the water-insulation casing 1; along the length direction of the riser 1, the end parts of two adjacent buoyancy blocks 2 are abutted;

Step S30, placing a plurality of buoyancy blocks 2 below the riser 1, and arranging the buoyancy blocks 2 along the length direction of the riser 1; and hoisting the buoyancy block 2 below the riser 1, attaching the mounting surface of the buoyancy block 2 to the outer surface of the riser 1, and fixedly connecting the buoyancy blocks 2 which are opposite to each other up and down of the riser 1.

In this embodiment a support rotation table 3 is provided for supporting the riser 1 on the ground. Referring to fig. 2 to 3, the supporting and rotating table 3 includes two supporting units 31 disposed opposite to each other and spaced apart from each other. Each supporting unit 31 includes a holder 311 and two rotation wheels 312 disposed on an upper surface of the holder 311, and a pair of the rotation wheels 312 are disposed opposite to and spaced apart from each other. In this embodiment, the two rotation wheels 312 can rotate around their own axes relative to the support 311, the rotation axes of the two rotation wheels 312 are parallel to each other, and the space between the two rotation wheels 312 forms an accommodating space 313 for placing a riser.

Further, the supporting and rotating table 3 of the present embodiment further includes a driving unit 32, and the driving unit 32 may be disposed on any one of the supporting units 31. The driving unit 32 includes a driving motor and a gear box, and the driving unit 32 is mounted on any one of the rotary wheels 312 in the supporting unit 31 to drive the rotary wheel 312 to rotate about its own axis.

Before step S10 is performed, the support turntable 3 is placed on the ground so that the two support units 31 are opposed to each other and spaced apart from each other. The distance between the two support units 31 is adjusted such that the distance between the two support units 31 is adapted to the length of the riser 1.

In step S10, the two ends of the riser 1 are respectively placed in the accommodating spaces 313 on the two support units 31, so that the riser 1 is horizontally placed. When the riser 1 is placed on the support rotary table 3, the outer contour of the rotating wheel 312 is in contact with the outer surface of the riser 1, and a space is formed between the lower surface of the riser 1 and the ground.

Preferably, after the riser 1 is placed on the support and rotation table 3, locking rings are installed at both ends of the riser 1. The locking ring on the one hand enables positioning of the installation of the buoyancy block 2 on the riser string 1 and on the other hand prevents axial movement of the buoyancy block 2 during installation.

Further, in step S20, the buoyancy block 2 is lifted by the lifting device in cooperation with the auxiliary lifting tool 4. Referring to fig. 4 and 5, the auxiliary hoisting tool 4 includes a top beam 41, a gripper arm mechanism 42, and a gripper mechanism 43.

Wherein, the top of back timber 41 is equipped with a plurality of lugs 411 with hoisting equipment looks adaptation, and a plurality of lugs 411 are arranged along the length direction interval of back timber 41.

The grasping arm mechanisms 42 are provided in a plurality of sets, and the plurality of sets of grasping arm mechanisms 42 are arranged at intervals along the length direction of the top beam 41. In this embodiment, the auxiliary hoisting tool 4 includes two sets of gripper arm mechanisms 42, and the two sets of gripper arm mechanisms 42 are respectively disposed at two ends of the top beam 41 in the length direction.

the top end of the gripping arm mechanism 42 of the present embodiment is connected to the top beam 41, and each set of gripping arm mechanism 42 includes a first gripping arm 421 and a second gripping arm 422 which are oppositely arranged. The first and second gripper arms 421 and 422 are each able to rotate relative to the top beam 41, towards and away from each other. The rotation axes of the first and second gripping arms 421 and 422 are parallel to the length direction of the top beam 41.

Further, in the present embodiment, the gripper arm mechanism 42 further includes two booms 423 and two links 424. Wherein the top ends of the two suspension rods 423 are hinged on the top beam 41 in a crossed manner. The two connecting rods 424 are hinged crosswise and are respectively hinged at the bottom ends of the two hanging rods 423. The first and second grasping arms 421 and 422 of the present embodiment are respectively and correspondingly connected to the bottom ends of two connecting rods 424 so as to be rotatable with respect to the top beam 41.

Further, the gripper mechanism 43 includes a pair of oppositely disposed grippers 431. The gripper 431 of the present embodiment has an L-shaped cross section, and the gripper 431 includes a connecting plate 432 and a bearing plate 433 fixed to a bottom end of the connecting plate 432. In this embodiment, the upper surface of the whole plate loading plate 433 is a hanging surface 434, and the extending direction of the hanging surface 434 is the same as the length direction of the top beam 41. When the gripper mechanism 43 grips the buoyancy block 2, the two lifting surfaces 434 can receive the bottom surfaces of the two sides of the buoyancy block 2 to cooperate with the lifting device to lift the buoyancy block 2 above the water-proof casing 1.

In this embodiment, the connecting plate 432 of one of the grippers 431 is fixed to the inner side surface of the bottom end of the first gripper arm 421, and the connecting plate 432 of the other gripper 431 is fixed to the inner side surface of the bottom end of the second gripper arm 422. When the first and second gripper arms 421 and 422 are rotated with respect to the top beam 41, the two grippers 431 can be relatively closed or opened to grip or release the buoyancy block 2.

Both ends of the gripper 431 in the length direction of the top beam 41 extend outwards beyond the gripper arm mechanism 42 to lengthen the lifting surface 434, so that the lifting surface 434 stably supports the buoyancy block 2 in the length direction, and the stability of the gripper 431 gripping the buoyancy block 2 is ensured.

Further, the hoisting auxiliary tool 4 further comprises a locking mechanism 44, and the locking mechanism 44 is arranged between the two sets of the grabbing arm mechanisms 42. In the present embodiment, the locking mechanism 44 includes a locking assembly and a pair of oppositely disposed fixing bars 441. The two fixing rods 441 are both parallel to the top beam 41, wherein both ends of one fixing rod 441 are respectively connected to two opposite connecting rods 424 of the two grasping arm mechanisms 42, and both ends of the other fixing rod 441 are respectively connected to the other two opposite connecting rods 424 of the two grasping arm mechanisms 42.

The locking assembly includes a locking screw 442 and a locking nut 443, with locking nut 443 threadedly engaged with locking screw 442. In this embodiment, the fixing rod 441 has a through hole for the locking screw 442 to pass through, and two ends of the locking screw 442 respectively penetrate through the two fixing rods 441 disposed opposite to each other. Both fixing rods 441 can slide along the locking screw 442 to be relatively close or far apart when the jaws are opened or closed.

Each fixing rod 441 of the present embodiment has locking nuts 443 disposed on both sides thereof, and the locking nuts 443 can be screwed with the locking screw 442. The locking nuts 443 on both sides of each fixing rod 441 can be relatively close to lock the fixing rod 441 on the locking screw 442, thereby locking the gripper 431 in the closed state or the open state.

Preferably, in the present embodiment, each gripper arm mechanism 42 further comprises a stop unit 45, the stop unit 45 comprising a stop bar 451 and a stop assembly. The stopper bar 451 is bent with its bent surface facing the suspension rod 423 and the link 424. In this embodiment, one end of the stopping rod 451 is connected to the connecting point of the suspension rod 423 and one of the connecting rods 424, and the other end of the stopping rod 451 is provided with a sliding groove 454.

The stop assembly includes a stop member 452 and a stop nut 453, the stop nut 453 being threadably engaged with the stop member 452. A stop 452 is disposed through the other link 424 near the bottom end, with both ends of the stop 452 extending outwardly beyond the surface of the link 424. The stopper 452 is inserted into the slide groove 454 of the stopper rod 451 at one end and is movable along the slide groove 454.

In the present embodiment, two stop nuts 453 are provided for each of the gripper arm mechanisms 42, one of the stop nuts 453 being disposed outside the stop bar 451, and the other stop nut 453 being disposed outside the link 424. The two retaining nuts 453 can move relatively closer to or farther away from each other when the retaining member 452 is rotated along its own axis. When the two stop nuts 453 are relatively close to each other, the stop rod 451 is fixed to the link 424, and the locking of the stop unit 45 is achieved.

In addition, a plurality of reinforcing rods are arranged between the two groups of the grabbing arm mechanisms 42, and the reinforcing rods are parallel to the top beam 41. The reinforcing rods may be disposed between opposing links 424 in both sets of gripper arm mechanisms 42 or between opposing booms 423 in both sets of gripper arm mechanisms 42. The tip and the connecting rod 424 or jib 423 fixed connection of stiffener can strengthen the holistic structural strength of hoist and mount auxiliary fixtures 4 on the one hand, and on the other hand can also guarantee two sets of grab arm mechanisms 42 simultaneous movement, guarantees that the gripper 431 snatchs buoyancy block 2 steadily.

When the step S20 is executed, the buoyancy block 2 is lifted above the water-proof casing 1 by using the lifting device and the auxiliary lifting tool 4. Specifically, the auxiliary hoisting tool 4 is hoisted to the buoyancy block 2 to be installed by using hoisting equipment. Before lifting the buoyancy block 2, the position of the fixing rod 441 on the locking screw 442 is adjusted according to the width of the buoyancy block 2, and the locking nuts 443 are screwed and fixed on the two sides of the fixing rod 441, so that the gripper 431 is kept in an open state, and the opening degree of the gripper 431 is larger than the width of the buoyancy block 2.

And then the gripper 431 of the hoisting auxiliary tool 4 is adjusted to the position to be clamped on the buoyancy block 2, and the locking of the locking mechanism 44 is released. The hoisting auxiliary tool 4 is lifted by using hoisting equipment, the two grippers 431 are clamped on two sides of the buoyancy block 2 under the action of self gravity, and the hoisting contact surfaces 434 of the two grippers 431 are enabled to bear the bottom surfaces of the two sides of the buoyancy block 2. At this time, the locking assembly and the stopper unit 45 are locked by the engagement of the locking nut 443 with the locking screw 442 and the engagement of the stopper 452 with the stopper nut 453, so that the gripper 431 is maintained in the clamped state to the buoyancy block 2.

Hoisting the buoyancy block 2 to the upper part of the water-insulation casing pipe 1 by using hoisting equipment, and attaching the mounting surface of the buoyancy block 2 to the outer surface of the water-insulation casing pipe 1. After the buoyancy block 2 is mounted in place, the locking assembly and the stopping unit 45 are unlocked, so that the clamping jaws release the clamping of the buoyancy block 2. Under the integral gravity action of the hoisting auxiliary tool 4, the two clamping jaws can be relatively far away to restore the opening state. And the locking nut 443 is matched with the locking screw 442 to lock the locking assembly, and the opening degree of the claw is larger than the width of the buoyancy block 2. And hoisting the hoisting auxiliary tool 4 away from the marine riser 1 by using hoisting equipment so as to install the next buoyancy block 2.

repeating the above operations, the buoyancy blocks 2 are sequentially installed along the length direction of the riser 1, thereby completing the installation of the buoyancy blocks 2 above the riser 1. In the installation process, the end parts of the two adjacent buoyancy blocks 2 are abutted, and no gap is formed between the two adjacent buoyancy blocks 2.

in this embodiment, the installation of the buoyancy block 2 above the marine riser 1 is performed by the auxiliary hoisting tool 4 in cooperation with hoisting equipment, so that the installation of the buoyancy block 2 on the marine riser 1 can be efficiently completed, the damage to the buoyancy block 2 in the installation process can be avoided, and the overall quality of the buoyancy block 2 is ensured.

Further, the embodiment further provides a bearing tool 5, and the bearing tool 5 is used for bearing the buoyancy block 2 to be installed. When the buoyancy block 2 is placed on the bearing tool 5, the installation surface of the buoyancy block 2 faces upwards. Referring to fig. 6 to 8, the bearing tool 5 includes a bearing table 51 and a roller 52 disposed on a lower surface of the bearing table 51. The bearing platform 51 is provided with a bearing surface 511 for bearing the buoyancy block 2, lifting lugs 53 are symmetrically arranged on two sides of the bearing surface 511, and the lifting lugs 53 are used for being matched with hoisting equipment to hoist the bearing tool 5.

When the buoyancy block 2 is placed on the bearing surface 511 of the bearing tool 5, a plurality of wedge-shaped wood blocks 54 may be fixed on both sides of the buoyancy block 2 in the length direction to prevent the buoyancy block 2 from rolling on the bearing surface 511 of the bearing tool 5. In other preferred embodiments, the wedge-shaped wood blocks 54 may be pre-fixed on the load-bearing tool 5 according to the size of the buoyancy block 2.

When step S30 is performed, the buoyancy block 2 is placed on the bearing tool 5, and the bearing tool 5 is pushed under the action of the roller 52 to push the buoyancy block 2 to the lower side of the riser 1, so that the length direction of the buoyancy block 2 is the same as the length direction of the riser 1.

According to the above operation, the plurality of buoyancy blocks 2 are pushed to below the riser 1, and the plurality of buoyancy blocks 2 are arranged in the length direction of the riser 1. And then, the buoyancy block 2 below the marine riser 1 is lifted through the matching of the hoisting equipment and the lifting straps 6 with the lifting lugs 53 on the bearing tool 5, the mounting surface of the buoyancy block 2 is attached to the lower surface of the marine riser 1, and finally the buoyancy blocks 2 opposite to each other up and down of the marine riser 1 are fixedly connected.

In this embodiment, the installation of the buoyancy block 2 below the riser 1 is realized by the matching of a hoisting device and a bearing tool 5. The hoisting equipment is connected with the bearing tool 5 in the hoisting process, so that interference with the buoyancy block 2 on the bearing tool 5 is avoided, and the buoyancy block 2 is prevented from being damaged in the installation process. The butt joint of the upper buoyancy block 2 and the lower buoyancy block 2 of the marine riser 1 is realized through hoisting, the butt joint precision between the two pairs of buoyancy blocks 2 on the marine riser 1 is ensured, and the installation efficiency of the buoyancy blocks 2 below the marine riser 1 can be improved.

the opposite buoyancy blocks 2 on two sides of the marine riser 1 are fixedly connected through studs, and bolt holes are formed in the corresponding positions of the two opposite buoyancy blocks 2.

In the step S30, after the bearing tool 5 is lifted, centers of bolt holes on the buoyancy blocks 2 opposite to each other in the up-down direction of the riser 1 are aligned, and the stud penetrates through the aligned bolt holes and is locked by the nut, so that the buoyancy blocks 2 opposite to each other in the up-down direction of the riser 1 are fixedly connected. Before the stud and the nut are installed, molybdenum disulfide inductive lubricant can be used for smearing the stud and the nut to prevent the loss of torsion of the nut in the installation process.

Further, in this embodiment, after the opposite buoyancy blocks 2 on the riser 1 are fixedly connected, the tightness between the two opposite buoyancy blocks 2 on the riser 1 needs to be detected.

When the tightness between the buoyancy blocks 2 is detected, the driving motor supporting the rotating platform 3 is turned on, so that the driving motor drives the rotating wheel 312 to rotate, and the rotation of the rotating wheel 312 can drive the marine riser 1 placed on the supporting unit 31 to rotate around the axis of the marine riser. During rotation of the riser 1, the torque of the nut is checked and it is checked whether the nut connecting the two opposing buoyancy blocks 2 is loose. If the nut is loosened, the rotation of the marine riser 1 is stopped, and the nut is screwed again to ensure the fixed connection between the buoyancy blocks 2.

In addition, after the fixed connection of the opposite buoyancy blocks 2 on the riser 1 is completed, the installation accuracy of each buoyancy block 2 on the riser 1 needs to be detected. The detection of the mounting accuracy of the buoyancy block 2 may be performed after the tightness detection. In this embodiment a measuring fixture 7 is provided for checking the mounting accuracy of each buoyancy block 2 on the riser 1.

Referring to fig. 9 and 10, the measuring jig 7 has a plate-like structure having a thickness of 15mm to 30 mm. The measuring fixture 7 is made of a wooden material to reduce the overall weight of the measuring fixture 7, facilitating the use of an operator.

In the present embodiment, the measuring jig 7 includes a pair of jig split bodies 71 disposed opposite to each other. Each fixture split 71 has a notch 711, and the shape of the edge of the fixture split 71 near the notch 711 is consistent with the shape of the outer surface of the buoyancy block 2.

Further, the two jig split bodies 71 are detachably coupled so that the notches 711 of the two jig split bodies 71 are opposed to and enclose the detection chamber 72. The measuring fixture 7 can be fitted on the outside of the riser 1 so that the riser 1 is accommodated in the inspection cavity 72. In this embodiment, a plurality of measurement mark points 73 are provided at intervals on the edge of each fixture split body 71 close to the detection cavity 72, and the installation accuracy of the buoyancy block 2 on the riser 1 can be judged by measuring the distance between the mark points 73 and the buoyancy block 2.

Further, both ends of each jig split body 71 are provided with coupling parts 712 to be protruded outward. Through holes are formed in the positions corresponding to the connecting portions 712 of the two fixture split bodies 71, so that the fasteners 74 can pass through the through holes to detachably mate the two fixture split bodies 71.

In the present embodiment, the fasteners 74 are studs. Nuts are arranged at two ends of the stud and are in threaded connection and matching with the stud. When the stud bolt passes through the corresponding through holes on the two fixture split bodies 71, fixing nuts are screwed at the two ends of the stud bolt, so that the two fixture split bodies 71 are detachably connected. After the two fixture split bodies 71 are detachably connected, the notches 711 of the two fixture split bodies 71 are opposite and enclose the detection cavity 72. The measuring fixture 7 is fitted over the riser 1 so that the riser 1 is received in the inspection cavity 72.

Further, the two jig split bodies 71 are detachably coupled so that the notches 711 of the two jig split bodies 71 are opposed to and enclose the detection chamber 72. The measuring fixture 7 can be fitted on the outside of the riser 1 so that the riser 1 is accommodated in the inspection cavity 72. In the embodiment, a plurality of measuring mark points 73 are arranged at intervals on the edge of each fixture split body 71 close to the detection cavity 72, and the installation accuracy of the buoyancy block 2 on the riser 1 can be detected by measuring the distance between the mark points 73 and the buoyancy block 2.

in the present embodiment, both ends of each jig split body 71 are provided with coupling parts 712 to be protruded outward. Through holes are formed in the positions corresponding to the connecting portions 712 of the two fixture split bodies 71, so that the fasteners 74 can pass through the through holes to detachably mate the two fixture split bodies 71.

The fastener 74 of this embodiment is a stud, and nuts are disposed at both ends of the stud, and the nuts are in threaded engagement with the stud. When the stud bolt passes through the corresponding through holes on the two fixture split bodies 71, fixing nuts are screwed at the two ends of the stud bolt, so that the two fixture split bodies 71 are detachably connected. After the two fixture split bodies 71 are detachably connected, the notches 711 of the two fixture split bodies 71 are opposite and enclose the detection cavity 72. The measuring fixture 7 is fitted over the riser 1 so that the riser 1 is received in the inspection cavity 72.

In this embodiment, when the two fixture split bodies 71 are detachably connected, a distance is provided between the two connecting portions 712 connected in the two fixture split bodies 71, and the distance is 10mm to 20 mm.

Further, in this embodiment, the contour of the edge of the clamp split 71 near the notch 711 includes a straight section 713, an arc-shaped section 714 connected to both ends of the straight section 713, and a connecting section 715 formed by extending the ends of the arc-shaped section 714. Wherein, the connecting section 715, the arc-shaped section 714 and the straight section 713 are all provided with the measuring mark points 73.

In each fixture split 71 of this embodiment, one measurement mark point 73 is provided on each of the connecting section 715, the arc-shaped section 714, and the straight section 713. The measurement mark point 73 on the connecting segment 715 is arranged near the midpoint of the connecting segment 715, the measurement mark point 73 on the arc-shaped segment 714 is arranged near the midpoint of the arc-shaped segment 714, and the measurement mark point 73 on the straight segment 713 is arranged near the midpoint of the straight segment 713.

preferably, the connecting portion 712 of the present embodiment is disposed corresponding to the connecting section 715, and the connecting portion 712 has a cylindrical shape. The arrangement can be convenient for two fixture split bodies 71 to be accurately butted on one hand, and can ensure the detection accuracy of the measuring fixture 7 on the other hand.

Further, the outer contour line of the fixture split body 71 of the present embodiment is rectangular, and the notch 711 is formed by inwardly recessing one of the long sides of the fixture split body 71. In this embodiment, the top corners of the clamp body 71 away from the notch 711 are rounded. The outer contour lines of the fixture split bodies 71 are set to be rectangular, so that an operator can conveniently and quickly butt the two fixture split bodies 71 to enable the measuring fixture 7 to be sleeved on the marine riser 1, and the distance from the mark point 73 to the buoyancy block 2 is measured by taking the regular shape as a reference, so that the measuring accuracy can be effectively guaranteed. The top corners of the jig split bodies 71 away from the notches 711 are rounded, so that the comfort of the operator in using the measuring jig 7 can be improved.

Preferably, in this embodiment, an opening 75 is formed near the rounded corner of the fixture split body 71. Each of the openings 75 is formed through the thickness direction of the measuring jig 7, and the opening 75 of this embodiment has an arc shape. The jig split body 71 is provided with the opening 75, so that the self weight of the whole measuring jig 7 can be reduced, and the use of an operator is facilitated.

Referring to fig. 11, when the installation accuracy of each buoyancy block 2 on the riser 1 is detected, the two fixture split bodies 71 are respectively clamped on the riser 1, and the two fixture split bodies 71 are fixed by using studs and nuts, so that the riser 1 is accommodated in the detection cavity 72.

The measuring fixture 7 is sleeved on two opposite buoyancy blocks 2 close to the end of the marine riser 1, the distance from each measuring mark point 73 to the surface of the buoyancy block 2 is measured, and the measured data is recorded. And comparing the measurement data with the precision size of the installation requirement, wherein the precision size of the installation requirement is the installation standard of the buoyancy block 2 on the marine riser 1, and the precision size is the standard value meeting the installation requirement. If the measured data meets the tolerance requirement, the end part of the buoyancy block 2 meets the installation standard; if the tolerance requirement is not met, the torque of the nut for connecting the two opposite buoyancy blocks 2 is adjusted until the measured data meets the installation standard.

After the buoyancy blocks 2 close to the end of the riser 1 are subjected to installation accuracy detection, the measuring clamp 7 is moved along the length direction of the riser 1, and the installation accuracy of each buoyancy block 2 on the riser 1 is detected one by one.

In this embodiment, when the precision of each buoyancy block 2 is detected, the measuring fixture 7 is firstly sleeved on one end of the buoyancy block 2, and the installation precision of the buoyancy block 2 is measured by using the method; and then along the length direction of the riser 1, moving the measuring fixture 7 to the other end of the buoyancy block 2, and detecting the smoothness of the installation of the buoyancy block 2 on the riser 1 in the moving process. When the jig 7 to be measured is moved to the other end portion of the buoyancy block 2, the distance from each measurement mark point 73 to the surface of the buoyancy block 2 is measured and the measurement data is recorded, and the measurement data is compared with the mounting required precision dimension. If the measured data meets the tolerance requirement, the other end part of the buoyancy block 2 also meets the installation standard; if the tolerance requirement is not met, the torque of the nut for connecting the two opposite buoyancy blocks 2 is adjusted until the measured data meets the installation standard.

And after the installation accuracy of each buoyancy block 2 on the water-resisting sleeve 1 is detected to be qualified, taking down the measuring clamp 7, installing a nylon nut on the stud of the buoyancy block 2 and adjusting the torque of the nylon nut. And marking the nut with the adjusted torque by using a marker pen, recording the labels of the corresponding marine riser 1 and the buoyancy block 2, and filing for record.

Finally, thrust rings are pushed at both ends of the riser 1 to abut against the adjacent buoyancy blocks 2. And then, the marine riser 1 is rotated by using the support rotating platform 3, so that the stacking surface of the marine riser 1 faces downwards, and the marine riser 1 on which the buoyancy block 2 is mounted is lifted to a cross beam or a support by using a lifting device.

In summary, in the method of this embodiment, all the buoyancy blocks above the riser are installed first, and then the buoyancy blocks below the riser are installed. When the buoyancy blocks below the marine riser are installed, the buoyancy blocks above and opposite to the marine riser are used as the reference, and the buoyancy blocks opposite to each other up and down of the marine riser are butted, so that the butting precision of each pair of buoyancy blocks is controlled conveniently, and the integral installation precision of the buoyancy blocks on the marine riser can be effectively guaranteed. In addition, the buoyancy below the marine riser is installed in a hoisting mode, the buoyancy blocks can be prevented from being damaged by hoisting installation, the installation quality of the buoyancy blocks on the marine riser is guaranteed, and the installation cost of the buoyancy blocks is saved.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.