CN105065777A - Anchoring plate type naked pipeline lateral displacement control device - Google Patents

Abstract

The invention relates to an anchoring plate type naked pipeline lateral displacement control device. The anchoring plate type naked pipeline lateral displacement control device comprises an anchoring plate (1) used for a pressure bearing pipeline (5), a sliding bearing (2), a mooring rope (3) and self-unlocking hooks (4), wherein the anchoring plate (1) comprises a disc (6), connection rings (7) and multiple cylinders (8) with openings in the bottom; the cylinders (8) are evenly distributed; one middle connection ring (7) used for being connected with the mooring rope (3) is fixedly arranged in the center of the disc (6); the other two hook connection rings (7) used for being connected with the self-unlocking hooks (4) are fixedly arranged on the two sides of the disc (6); the sliding bearing (2) comprises an inner bearing ring (9), an outer bearing ring (11) with a groove (10) and a protection layer structure (12); the outer surface of the outer bearing ring (11) is provided with the groove (10); the protection layer structure (12) is fixed to the inner bearing ring (9). According to the anchoring plate type naked pipeline lateral displacement control device, the problem that lateral displacement is large in the whole bending process of a deep sea naked pipeline can be solved effectively.

Description

A kind of anchoring disc type naked laid pipes Side movement control gear

Art

The invention belongs to naked laid pipes complete buckling control field, carry out Side movement control for during pipeline generation complete buckling.

Background technique

Along with the development of ocean engineering technology and the exploitation of Marine oil and gas resource, the particularly exploitation of deepwater and marginal oil field, the working pressure of submarine pipeline improves constantly, its design temperature generally reaches more than 100 DEG C, even 150 DEG C, there is the submarine pipeline worked under high temperature, hyperbaric environment that gets more and more.Under the synergy of hot load and compressive load, will there is axial deformation in pipeline, and under the restriction of the soil body around, pipeline will bear larger axial stress.When axial stress reaches certain value, will there is complete buckling in pipeline, comprise that axial integral moves, vertical flexing and lateral buckling.In general, can there is vertical flexing by surrounding soil restriction in buried pipeline, upwards swell; And for the naked pipeline be layered on sea bed, the possibility that lateral buckling occurs is larger.Show the investigation of existing submarine pipeline, the harm of pipeline bending deformation can not be ignored.The complete buckling deformation controlling problem of submarine pipeline under High Temperature High Pressure effect becomes the critical problem of piping design.

Usually there are two kinds of design objects in the design for high temperature, high-pressure undersea bottom pipeline complete buckling: the first is complete restriction conduit generation complete buckling; The second allows pipeline generation complete buckling, but the position of pipeline generation flexing and the moment of flexure of post-buckling and Stress Control are in allowed limits, i.e. pipeline flexing under control.For the first design object, usual employing ditching is buried underground or the method for enrockment carrys out restriction conduit generation complete buckling, but for buried pipeline, the buried depth of pipeline is the governing factor of design, only protuberance flexing could occur restriction conduit when the depth of burying meets the demands, and the axial stress of pipeline can not get effective release.Buried underground by ditching or enrockment with the method for restriction conduit generation complete buckling shallow sea construction in often adopt.In deep-sea, ditching is buried underground with enrockment operation easier large, and cost is high.Therefore, for the naked laid pipes in deep-sea, allow the design method of pipeline generation complete buckling to be the unique feasible method controlling the design of pipeline complete buckling in deepwater exploitation.

For the design object allowing pipeline that complete buckling occurs under control, can pipeline extremely important in predeterminated position generation complete buckling.Usually the method adopted at present has: snakelike laying-out tube process, sleeper perturbation method and distribution buoyancy method.The existing method of submarine pipeline generation complete buckling that excites all can only excite submarine pipeline generation complete buckling by increasing initial imperfection or reducing lateral resistance, complete buckling is converted into the little flexing of multistage thus protective conduit is not destroyed.But, when after pipeline generation complete buckling, the amplitude of submarine pipeline complete buckling can not be controlled.If serious lateral buckling occurs submarine pipeline, even if Side movement is still excessive after have employed above-mentioned three kinds of methods.Stress in pipeline will be caused excessive, thus cause the problems such as submarine pipeline generation cripling or pipeline breaking, this will cause pipe leakage or pipeline cannot normally be worked.In addition, above-mentioned three kinds of methods are only applicable to long-distance sand transport pipeline, but for infield gathering line, because its distance is relatively short, above-mentioned three kinds of methods will be no longer applicable.

Summary of the invention

In order to overcome the deficiency in prior art, the invention provides a kind of device carrying out Side movement control at deep-sea during naked laid pipes generation complete buckling.This device, when pipeline generation complete buckling, when the lateral movement distance of pipeline is in the safe distance designed, does not provide side direction soil drag; When the lateral movement distance of pipeline reaches the limiting safe distance of design, the side direction soil drag that pipeline is subject to can be increased, thus the Side movement controlling pipeline increases further, effectively solve the problem that in the naked laid pipes complete buckling process of deep-sea, Side movement is excessive.Technological scheme of the present invention is as follows:

A kind of anchoring disc type naked laid pipes Side movement control gear, comprise for the anchor disc (1) of bearing pipe (5), sliding bearing (2), mooring line (3) and Self-unlocking hook (4) several part, wherein

Anchor disc (1) comprises the cylinder (8) offering pertusate disk (6), connecting ring (7) and several bottom opening, each cylinder (8) is fixedly connected on the below at certain hole place, each cylinder (8) is evenly arranged, and be centrosymmetric design; Being fixed with the intermediate connector (7) for connecting mooring line (3) at the center of disk (6), being also fixed with two other clevis coupler (7) for connecting Self-unlocking hook (4) in its both sides;

Sliding bearing (2) comprises bearing inner race (9), bearing outer ring (11) with fluted (10) and protective layer structure (12), the internal diameter of bearing inner race (9) matches with the external diameter of pipeline (5), and bearing inner race (9) is also fixed on pipeline (5); Bearing outer ring (11) can rotate around bearing inner race (9), and the outer surface band of bearing outer ring (11) is fluted (10), for being wound around mooring line (3); Protective layer structure (12) is fixed on bearing outer ring (9), is surrounded by whole sliding bearing (2), has the aperture passed for mooring line (3) in the bottom of protective layer structure (12); With two hook holes (13) on protective layer structure (12);

Self-unlocking hook (4) comprises two hooks, and one end of hook has pin shaft hole, and one end is hook-shaped in addition, and the clevis coupler (7) had in one end of pin shaft hole and anchor disc (1) couples together by employing bearing pin; Its hook-shaped one end is hooked on the hook hole (13) of protective layer structure (12).

Device provided by the invention can be used alone in the naked laid pipes complete buckling of control, also can with the existing method conbined usage exciting submarine pipeline generation complete buckling, thus control the distortion of submarine pipeline complete buckling better, avoid because pipeline Side movement is excessive and cause submarine pipeline integrity to be destroyed.Specifically, there is following beneficial effect:

1. adopt sliding bearing instead of rolling bearing, strengthen corrosion resistance and wear resistance.Avoid the shortcoming that the rolling element of rolling bearing is perishable and not wear-resisting.

2. adopt bearing release mooring line instead of be directly wrapped in pipeline outer wall, mooring line not existed with pipeline outer wall in releasing course and directly contacts, avoid mooring line to the frictionally damage of pipeline outer wall, avoid mooring line and additional torque is applied to pipeline.

3. bearing outer wall is provided with protective layer, and protection sliding bearing normally works, and prevents seabed silt and halobiontic attachment.

4. rely on anchor disc to fix, by the maximum Side movement of mooring line cut to lengthen pipeline, ensure that the unrestricted motion of pipeline in safety range, eliminate the accumulation of axial stress.

5. control gear is simple and convenient, not fragile.

Accompanying drawing explanation

Fig. 1 is the overall structure schematic diagram of apparatus of the present invention

Fig. 2 is the structural representation of anchor disc

Fig. 3 is the schematic cross section of sliding bearing

Fig. 4 is in pipe-laying process and has laid rear Self-unlocking hook status schematic diagram

The working state schematic representation of this device when Fig. 5 is pipeline generation lateral movement

In figure: 1, anchor disc, 2, sliding bearing, 3, mooring line, 4, Self-unlocking hook, 5, pipeline; 6, circular steel plate (disk), 7, connecting ring, 8, columnar structured, 9, bearing inner race; 10, groove, 11, bearing outer ring, 12, protective layer structure, 13, hook hole

Embodiment

Below in conjunction with drawings and Examples, the invention will be further described.

1, Side movement control gear of the present invention, mainly comprises anchor disc 1, sliding bearing 2, mooring line 3 and Self-unlocking and links up with 4 several parts (see Fig. 1).

2, anchor disc 1 comprises columnar structured 8 (see Fig. 2) of circular steel plate 6, three connecting rings 7 and several bottom opening.The below of circular steel plate 6 is welded with the below that columnar structured 8, columnar structured 8 of several bottom opening is evenly distributed in circular steel plate 6.One of them connecting ring 7 is positioned at the middle place above circular steel plate 6, for connecting mooring line 3; Two other connecting ring 7 is positioned at the both sides of intermediate connecting ring 7, for connecting Self-unlocking hook 4.During working state, columnar structured 8 in anchor disc 1 inserts sea bed, increases pipeline 5 lateral movement soil drag, the Side movement of restriction conduit 5.The anchor disc 1 structure employing Central Symmetry design that the present invention is used, can bear the power from different direction, when pipeline 5 is in anchor disc 1 both sides to-and-fro motion, this device has identical effect.

3, sliding bearing 2 comprises bearing inner race 9, the bearing outer ring 11 with fluted 10, protective layer structure 12 (protective layer structure of the present embodiment is the steel drum larger than the bearing outer ring 11 of sliding bearing, see Fig. 3).The internal diameter of bearing inner race 9 and the external diameter of pipeline 5 match, and bearing inner race 9 is fixed by welding on pipeline 5, ensure not produce relative sliding to each other.The internal diameter of bearing outer ring 11 equals or slightly larger than the external diameter of bearing inner race 9, bearing outer ring 11 can rotate around bearing inner race 9, and the outer surface band fluted 10 of bearing outer ring 11, for being wound around mooring line 3.Protective layer structure 12 is welded in bearing outer ring 9; whole sliding bearing 2 is surrounded; sliding bearing 2 is made to avoid mechanical deterioration; protective layer structure 12 has aperture; aperture is positioned at the bottom of protective layer structure 12; the mooring line 3 being wrapped in sliding bearing 2 is stretched out by this aperture, and mooring is in anchor disc 1.In addition, with two hook holes 13 on protective layer structure 12, the hook of Self-unlocking hook 4 hangs on this hook hole 13.

4, mooring line 3 can adopt steel cables, also can adopt the cable of other material.One end of mooring line 3 is fixed on the bearing outer ring 11 of sliding bearing 2, and one end is fixed on the attachment hole of anchor disc 1 in addition.According to the length of designing requirement determination mooring line 3, mooring line 3 length of needs is wrapped on the groove 10 on bearing outer ring 11.

5, Self-unlocking hook 4 is made up of two hooks.One end of hook has pin shaft hole, and one end is hook formation in addition.Bearing pin is adopted to be coupled together by the attachment hole had in one end of pin shaft hole and anchor disc 1.In pipeline 5 process of deployment, hook formation hangs on the hook hole 13 on protective layer structure 12, avoids anchor disc 1 and pipeline 5 to depart from (see Fig. 4-1).After pipeline 5 has been laid, the hook hole 13 of hook automatically and on protective layer structure 12 in Self-unlocking hook 4 departs from (see Fig. 4-2).The effect of Self-unlocking hook 4 ensures that pipeline 5 anchor disc 1 in process of deployment does not depart from pipeline 5; After pipeline 5 has been laid, this self-locking structure has not affected the normal work of apparatus of the present invention.

6, after pipeline 5 has been laid, anchor disc 1 inserts sea bed, and pipeline 5 is pressed in (see Fig. 4-2) above anchor disc 1.Anchor disc 1 relies on self gravitation and pipeline 5 gravity to embed sea bed, plays the effect increasing pipeline 5 lateral movement soil drag.When complete buckling occurs pipeline 5, pipeline 5 lateral movement, anchor disc 1 keeps motionless, and mooring line 3 part be wrapped on bearing outer ring 11 is unclamped, and anchor disc 1 does not provide side direction soil drag.When pipeline 5 lateral movement is to certain distance, the mooring line 3 be wrapped on bearing outer ring 11 is totally released, and anchor disc 1 starts to provide side direction soil drag, thus restriction conduit 5 lateral movement (see Fig. 5).

Claims (1)

1. an anchoring disc type naked laid pipes Side movement control gear, comprises for the anchor disc (1) of bearing pipe (5), sliding bearing (2), mooring line (3) and Self-unlocking hook (4) several part.Wherein,

Anchor disc (1) comprises the cylinder (8) offering pertusate disk (6), connecting ring (7) and several bottom opening, each cylinder (8) is fixedly connected on the below at certain hole place, each cylinder (8) is evenly arranged, and be centrosymmetric design; Being fixed with the intermediate connector (7) for connecting mooring line (3) at the center of disk (6), being also fixed with two other clevis coupler (7) for connecting Self-unlocking hook (4) in its both sides;

Sliding bearing (2) comprises bearing inner race (9), bearing outer ring (11) with fluted (10) and protective layer structure (12), the internal diameter of bearing inner race (9) matches with the external diameter of pipeline (5), and bearing inner race (9) is also fixed on pipeline (5); Bearing outer ring (11) can rotate around bearing inner race (9), and the outer surface band of bearing outer ring (11) is fluted (10), for being wound around mooring line (3); Protective layer structure (12) is fixed on bearing outer ring (9), is surrounded by whole sliding bearing (2), has the aperture passed for mooring line (3) in the bottom of protective layer structure (12); With two hook holes (13) on protective layer structure (12);

Self-unlocking hook (4) comprises two hooks, and one end of hook has pin shaft hole, and one end is hook-shaped in addition, and the clevis coupler (7) had in one end of pin shaft hole and anchor disc (1) couples together by employing bearing pin; Its hook-shaped one end is hooked on the hook hole (13) of protective layer structure (12).