CN2381861Y - Pipeline laying apparatus at shallow seabed - Google Patents

Abstract

A shallow sea submarine pipeline laying device, the pipe-laying ship and the bracket ship are connected by steel cables, the tail of the pipe-laying ship has a fixed bracket, the inclined guide rail is set on the center line of the pipe-laying ship, and there is a traction on the inclined guide rail The trolley uses steel cables to go around the guide pulley to connect the traction trolley with the tensioning pipeline with a winch, and there are two lifting brackets on the bracket ship. The utility model can maintain the shape of the pipe in the vertical plane and the horizontal plane, ensure that the internal stress of the pipe during laying does not exceed its allowable stress, and can reduce the tension force and reduce the requirements for tension equipment, especially suitable for large diameter pipes. Laying of thin-walled steel pipes in shallow water.

Description

Shallow Sea Submarine Pipeline Laying Device

The utility model relates to a shallow-sea submarine pipeline laying device, which is an operation device and a lifting frame structure for offshore pipeline laying, and belongs to the field of special operation methods and mechanical equipment in marine pipeline laying engineering.

In the prior art, conventional pipe-laying barges are the most commonly used installation method for submarine pipelines. The pipes are supplied to the pipe-laying barge in the form of a single piece or a certain length by a cargo barge, and the deck crane lifts the pipes onto the pipe-laying barge. Storage rack. During pipe laying, the crane transfers the pipes from the pipe storage rack to an automatic pipe feeding rack, and then to the alignment table for non-destructive inspection of welded pipes and welds. For pipelay operations, an anchor is positioned on the seabed, and the anchor cable is led through the ship's stinger and tied to the end of the first pipe. Take in the anchor cables of each anchor in the middle as required and release the stern anchor cables, and the pipe-laying barge will move forward. The pipes are supported by skids and stingers on barges before being lowered onto the seabed.

Brackets on the pipelay vessel help support the pipe and form an S-curve as it is laid, while tensioners placed along the line create a back drag to limit the curvature of the pipe as it is lowered to the seabed. Brackets and tensioning force have a considerable impact on the operation capacity of the pipe-laying ship. In many cases, it is because the tensioning force provided by the pipe-laying ship is not enough, or because the bracket is not long enough, the hanging section of the pipe is lengthened and the stress of the steel pipe is increased. , causing the steel pipe to buckle and wrinkle and be damaged. Especially for the laying of large-diameter thin-walled pipelines in shallow water, using conventional pipe-laying barges requires very long fixed or movable brackets, and too long brackets make it difficult for both the pipe-laying barge and the brackets to operate under severe sea conditions. control, and even make pipelaying operations impossible.

The purpose of this utility model is to design and manufacture a new type of submarine pipeline laying device, so that in the process of laying pipelines, the vertical and horizontal bending of the pipeline can be controlled within an acceptable range, and the internal stress and pressure of the pipeline can be reduced. The tension force required for pipe laying reduces the requirements for tensioning equipment, and is especially suitable for the laying of large-diameter thin-wall steel pipes in shallow water.

For realizing such purpose, the laying device that the utility model adopts comprises pipe-laying ship and bracket ship, and conventional pipe-laying ship has been improved. The pipe-laying ship is equipped with inclined guide rails, fixed brackets, traction trolleys and winches for tensioning pipes. The fixed bracket is fixed at the tail of the pipe-laying ship to support the laid steel pipe to form an S-shaped curve. The inclined guide rail is set on the center line of the pipe-laying ship with a support structure, and the inclination angle is determined according to the design requirements; there is a traction on the inclined guide rail. The trolley, the traction trolley is connected with the laid steel pipe with a steel cable, and a steel cable for tensioning the pipeline is bypassed by a guide pulley to connect the traction trolley and the winch to generate a tension force for laying the pipe; Eight positioning steel cables are used on the pipe-laying ship, and two pulling steel cables are used to pull the pipe-laying ship forward. The main equipment on the bracket ship is two lifting brackets. By adjusting the up and down and rotation angle of the lifting brackets, the stress condition of the pipeline during laying can be improved. The lifting bracket is mainly composed of the lifting rod, the crane pulley block, the fixed end of the lifting bracket and the movable bracket. The crane pulley block can lift the movable bracket or sink it to the seabed. Can move relative to each other. The carrier ship is positioned with four positioning cables, and the carrier ship and the pipe-laying ship are connected with two connecting cables.

The basic principle of the pipe laying operation method realized by the utility model is: to rely on the traction trolley for tensioning, the steel cable and the winch for tensioning the pipeline to provide the pipe laying tension force, and also rely on this system to cooperate with the lifting bracket on the bracket ship , to pick up and discard pipes; rely on the lifting bracket on the bracket ship to adjust the shape of the pipeline to adapt to different water depths; rely on the lifting bracket to transfer part of the gravity of the pipeline to the bracket ship, and rely on the buoyancy of the ship to overcome it ;Rely on the lifting bracket to transmit the lateral flow force on the pipeline to the ship, which is balanced by the restoring moment of the ship; when the pipe-laying ship moves forward, the supporting ship moves forward together.

In order to better understand the technical solution of the present utility model, further detailed description will be made below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of the overall structure of the utility model.

In the figure, the pipe-laying ship 1 and the bracket ship 6 are connected by steel cables 14, the inclined guide rail 2 is set on the center line of the pipe-laying ship 1, and there is a traction trolley 8 on the inclined guide rail 2, and the traction trolley 8 and the laid The steel pipes 4 are connected by steel cables 7, and there is a winch 10 for tensioning pipelines on the pipelaying ship 1, and the traction trolley 8 and the winch 10 for tensioning pipelines are connected by a steel cable 9 bypassing a guide pulley for the tensioning pipelines. It is used to generate a tension force when laying pipes; the fixed bracket 3 is fixed on the tail of the pin tube ship 1, and supports the laid steel pipe 4 to form an S-shaped curve; there are two lifting brackets 5 on the bracket ship 6 , by adjusting the up and down and rotation angle of the lifting bracket 5, the stress condition of the pipeline during laying is improved.

Fig. 2 is a schematic top view of the overall structure of the utility model.

It can be seen in the figure that the pipe-laying ship 1 and the bracket ship 6 are connected by two connecting steel cables 14, the pipe-laying ship 1 is positioned by eight positioning steel cables 12, and there are two traction pipe-laying ships 1 forward The traction steel cable 11, the bracket ship 6 is positioned with four positioning steel cables 13, and the steel pipe 4 of laying is positioned at the centerline of the pipe-laying ship 1.

Fig. 3 is a structural schematic diagram of the lifting bracket on a bracket ship of the present invention.

As shown in the figure, the lifting bracket 5 on the bracket ship 6 has a lifting rod 15, which can rotate a certain angle around its own center, and the lifting bracket fixed end 17 of the bottom of the lifting rod 15 has a semicircular groove, which can Put movable bracket 18, a crane pulley block 16 is installed on elevating rod 15. The crane pulley block can lift the movable bracket 18 or sink it to the seabed to control the deformation of the pipeline and carry out the operation of abandoning and picking up the pipe, and can be adjusted at any time to meet the operation requirements of different water depths. There is relative movement between the movable bracket 18 and the lifting bracket fixed end 17, and the movable bracket 18 can rotate a certain angle in the vertical plane and the horizontal plane, so as to adapt to the inclination of the laying pipeline in the vertical plane and the bending in the horizontal plane.

The bracket ship 6 adopted by the utility model has obvious effect, and can significantly reduce the stress of the pipe bending section. It is transmitted to the hull and balanced by the buoyancy of the hull. Compared with conventional pipe-laying ships, its control measures are clear and easy to operate. It avoids a long section of pipes in a hanging state on conventional pipe-laying ships, and accordingly greatly reduces the stress of the pipeline. The shape of the pipeline in the vertical plane is guaranteed. When the pipeline is affected by the flow force, a part of the flow force is transmitted to the hull of the bracket ship 6 through the lifting bracket 5, and the hull automatically tilts at an angle under the action of the heeling moment, and the restoring moment and the heel produced by the flow force Moment balance, this process can be automatically balanced without any control, and the shape of the steel pipe in the horizontal plane is maintained.

During normal pipe laying operations, the distance between the bracket ship 6 and the pipe laying ship 1 and the lifting of the lifting bracket 5 can be adjusted by adjusting the connecting steel cable 14 to control the deformation of the pipe. For different water depths, the operation is carried out by establishing the positions of the bracket ship 6 and the pipe-laying ship 1 and the height of the lifting bracket at different water depths, so that the stress of the pipes in each operating state can be controlled by an approximate order of magnitude. Make it not exceed the yield stress and meet the safety requirements.

When laying and abandoning the pipe, the joint effect of the pipe-laying ship 1 and the carrier ship 6 is utilized, so that other auxiliary ships are not needed. When abandoning the pipe operation, crane pulley block 16 and steel cable 7 coordinated actions in the two sets of hoisting brackets 5 that bracket ship 6 front and rear ends all have, and movable bracket 18 and pipeline 4 can be put into the seabed slowly.

When picking up the pipe, first align the elevating rod 15 with the movable bracket 18 on the seabed, and adjust it to a suitable height, and at the same time correctly determine the position of the pipe-laying ship 1, and then connect the movable bracket 18 with the crane pulley block 16 and the steel cable 7. Pipeline 4 is hoisted, movable bracket 18 is put into the semicircular groove of lifting bracket fixed end 17, the afterbody of pipeline other end is dragged onto pipe-laying ship 1 and fastened, and has just finished picking up pipe operation.

The tensioning steel cable 9 is connected with the tensioning pipeline on the pipe-laying ship 1 with a winch 10 to generate tension when laying the pipeline. Due to the cooperation of the bracket ship 6, there is no need for a huge tensioning force, which is generated in this way The tension force can meet the requirements of use, and there is no need for a tension device that produces a huge tension force like a conventional pipe-laying ship.

The utility model has low cost, solves the problem that the overlong bracket is difficult to control, and is especially suitable for laying large-diameter and thin-walled pipelines in shallow water.

Claims (2)

1. A shallow sea submarine pipeline laying device, comprising a pipe-laying ship and a bracket ship, characterized in that there is a fixed bracket 3 at the tail of the pipe-laying ship 1, and the inclined guide rail 2 is arranged on the center line of the pipe-laying ship 1, There is a traction trolley 8 on the inclined guide rail 2, and the traction trolley 8 is connected with the laid steel pipe 4 with a steel cable 7, and the steel cable 9 used for tensioning the pipeline bypasses a guide pulley to connect the traction trolley 8 and the winch 10, and the bracket There are two lifting brackets 5 on the ship 6, the pipe-laying ship 1 and the bracket ship 6 are positioned with steel cables, and the pipe-laying ship 1 and the bracket ship 6 are connected with a steel cable 14. 2. A shallow sea submarine pipeline laying device as claimed in claim 1, characterized in that said lifting bracket 5 has a lifting rod 15 that can rotate around its own center, and the fixed end 17 of the lifting bracket at the lower part has a half circle Shaped groove, wherein movable bracket 18 can be put, there is relative motion between movable bracket 18 and lifting bracket fixed end 17, and crane pulley block 16 is installed on elevating rod 15.

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