CN206112372U - Pre -tension prevents telescopic expansion loop of bucking - Google Patents

Abstract

The utility model discloses a pre -tension prevents telescopic expansion loop of bucking, including outer tube, outer casing pressure pipe, inner tube, clamp bolt, antifriction bearing and sealing rubber layer etc. This device is at the intraductal axial limit structure that sets up, has guaranteed the unilateral movement of the relative outer tube of inner tube, compares with traditional slip -type expansion joint, reduces pipeline and sealing material and produces the risk that reciprocating motion destroyed because of the warm -pressing ringing, axial limit structure makes the compressive stress that the production of partial warm -pressing combined effect can be offset to stress that prestretches of pipeline production simultaneously to prevent that the pipeline from taking place complete buckling, reach the tradition and cause the effect that prestretches stress and carry out the bucking protection through embedding prebuckling pipeline, solved the problem that the tradition prestretched the embedding difficulty in deep sea that stress application faces, practiced thrift construction cost simultaneously, guarantee the pipeline work safety.

Description

A kind of anti-buckling telescopic expansion loop of pretension

Technical field

The utility model is related to the anti-buckling method and apparatus field of submerged pipeline, and especially a kind of pretension is anti-buckling Telescopic expansion loop.

Background technology

21 century is the century of ocean.Currently, with the excessive growth of population, the aggravation consumption of the energy so that marine oil This emerging oil-gas mining source of gas resource, becomes the guardian technique that coastal various countries of the world competitively develop.In deep-sea oil In gas engineering, submarine pipeline is indispensable key equipment.The naked level for putting submerged pipeline is to complete buckling under HTHP It is one of principal mode of pipeline failure, is the allowed important technical challenges that deep-sea oil gas exploitation faces.

For this problem, large quantities of scholars have carried out one of a series of correlative study of submarine pipeline flexing protection, method It is that line construction is improved to realize pipe thermal compensation, mainly includes being mended using corrugated expansion joint in current engineer applied Repay, slip-type expansion joint compensation etc. various thermal compensation modes.Although above compensation way is technically ripe, exist to a certain degree Not enough and shortcoming, such as corrugated compensator installation difficulty with it is delayed, and compensation rate is less, typically in 200-300mm or so；Set Cartridge type compensator easily causes the destruction of encapsulant because of reciprocating motion, causes to reveal.Another kind of flexing means of defence is in pipe After road laying is finished, by applying a certain degree of temperature and pressure effect to unburied pipeline, produce pipeline pre- in the wrong in elastic range Song, then on position again by piping laying after flexing, so as to cause pre-tensile stress in pipeline, after coming into operation, pipe The compression part that line is produced under temperature and pressure synergy is offset by pre-tensile stress, so as to reach pipeline protective action, the method It is that submerged pipeline flexing protects one of most economical easy measure, its major defect is as oil development develops to deep-sea, to pre- The embedding construction of flexing pipeline is extremely difficult.

Utility model content

The utility model is based on pipeline complete buckling principle, proposes that one kind utilizes sleeve pipe connection section, and inner tube is by radially spacing Structure ensures concentric with outer tube, while inner tube is unidirectionally moved vertically by axial limit structure effect, makes pipeline produce elasticity In the range of pretension, when pipeline is worked by temperature and pressure synergy inside axial limit structure make pipeline produce pre-tensile stress The compression that part temperature and pressure synergy is produced is offset, the telescopic expansion loop of complete buckling occurs so as to prevent pipeline.Should Pretension slip-type expansion joint realizes the combination of conventional subsea pipeline flexing means of defence to the thermal compensation mode of pipeline.

The utility model is achieved through the following technical solutions：

A kind of anti-buckling telescopic expansion loop of pretension, including outer tube, overcoat pressure pipe, inner tube, hold-down bolt, rolling Dynamic bearing and caulking gum layer etc.；Outer tube is coaxially disposed with overcoat pressure pipe, and the two connects to form telescopic by hold-down bolt The left sleeve structure and right tube-in-tube structure at expansion loop two ends, is coaxially disposed interior between left sleeve structure and right tube-in-tube structure Pipe, along outer sleeve inner wall caulking gum layer is arranged, and arranges front roll bearing and rear rolling bearing at the two ends of caulking gum layer, outward It is placed equidistant axial limiter on casing pressure inside pipe wall vertically, edge in the region on the inside of overcoat pressure pipe is located on the outer wall of inner tube Circumference is provided with axial limiting groove, and the two ends of inner tube are embedded in the front roll bearing of outer tube, caulking gum layer and rear rolling In bearing.

And, described outer tube includes that side section, thick section, stage casing, thin segment and outer tube are raised, and side section is used to connect routine Conveyance conduit, side section and thick section have identical internal diameter, and thick section, stage casing and thin segment have identical external diameter, thick section tube wall Thickness is more than the thickness of stage casing tube wall, and the thickness of stage casing tube wall is more than the thickness of thin segment tube wall, and outer tube projection is arranged at thin segment End.

And, the internal diameter of described inner tube is equal to the internal diameter of overcoat tube side section and thick section.

And, it is provided with that overcoat pressure pipe is raised on the outer wall of described overcoat pressure pipe, hold-down bolt is arranged at overcoat pressure pipe Raised and outer tube the outer tube projection of overcoat pressure pipe between.

And, described caulking gum layer is arranged on the thin segment inwall of outer tube, and caulking gum layer is brought into close contact in outer Between internal surface of sleeve pipe and outer wall of inner tube, to ensure the sealing of outer tube and interior pipe connecting structure.

And, described front roll bearing and rear rolling bearing matches with inner tube, i.e. front roll bearing and the rear axis of rolling The internal diameter for holding is provided with steel ball, the steel in inner tube and bearing slightly larger than the external diameter of inner tube in front roll bearing and rear rolling bearing Pearl contacts, and while ensureing that inner and outer pipes are concentric with rolling bearing three, makes the relative motion resistance between inner and outer pipes to roll Frictional force.

And, described axial limiter is by axial limiting pedestal, axial limiting handle, rotating bolt and torque spring group Into axial limiting pedestal is welded on the inwall of overcoat pressure pipe, totally 4-8 group, is axially equally spaced along pipeline, per group by 6-16 Individual axial limiting pedestal is constituted, and is uniformly distributed on the same circumference of outer casing pressure inside pipe wall with group axial limiting pedestal；Axial limiting Handle is arranged between axial limiting pedestal, and isometrical circular hole is provided with axial limiting pedestal on axial limiting handle, rotates spiral shell Bolt links together axial limiting handle with axial limiting pedestal through circular hole, and two groups of torsion bullets are provided with the outside of rotating bolt Spring, the outboard end of two groups of torque springs is connected respectively with axial limiting pedestal, the medial extremity of two groups of torque springs respectively with axial direction Spacing handle connection.

And, described axial limiting groove is replaced to be connected and constitutes by straight plane with curved surface, under curved surface and axial limiting handle The curvature of end curved surface is identical, i.e., axial limiting handle matches with the curved surface of axial limiting groove, to guarantee that axial limiting handle can be with It is stuck in axial limiting groove, the quantity of curved surface is 4-8, and identical with the axially arranged quantity of axial limiter, two adjacent The distance between curved surface it is equal with the distance between axially connected axial limiter.

Compared with prior art, the beneficial effects of the utility model are：

1. the utility model is extended by pipeline and pre-tensile stress applies to realize thermal compensation that part is realized land installation, subtracted Few expansion loop installation cost；

2. the utility model thermal compensation realizes that the enough space to be preserved of outer segment ensure pipeline HTHP in outer casing section Freely extending under synergy；

3. the utility model arranges axial limit structure in pipe, and the structure ensure that unidirectional fortune of the inner tube with respect to outer tube It is dynamic, compare with conventional bushing-type compensator, reduce pipeline and encapsulant and move back and forth because temperature and pressure ringing is produced and destroy Risk；

4. the utility model axial limit structure makes inner and outer pipes unidirectionally move vertically, because HTHP acts on the pipe of elongation Section no longer bounces back in temperature-fall period, makes pipeline that certain pre-tensile stress is produced in temperature-fall period, pipeline second and with Afterwards in all working circulation, axial limit structure makes the pre-tensile stress that pipeline is produced to offset what part temperature and pressure synergy was produced , there is complete buckling in compression, reach tradition and cause pre-tensile stress to be bent by embedding prebuckling pipeline so as to prevent pipeline The effect of song protection, solves the problems, such as that the deep-sea that traditional pre-tensile stress applies to face is embedding difficult, while saved being constructed into This, it is ensured that pipeline work safety；

5. the torque spring of the utility model axial limiter, it is ensured that axial limiting handle is turned round before inner tube insertion sleeve Power spring effect is radially directed, and ensure that spacing handle is contacted with the perfection of limited impression in the work phase；

6. there is the utility model the rolling bearing device of radial direction limit function ensure that the concentric motion of inner and outer pipes axial direction；

7. the utility model high-temperature resistant rubber sealant internal diameter is slightly less than inner tube external diameter, sealant extruding inner tube, it is ensured that good Good sealing effectiveness.

Description of the drawings

Fig. 1-1 is a kind of telescopic expansion loop longitudinal section sectional view of new pretension.

Fig. 1-2 is the thin portion structural representation of the one side (left sleeve structure) of Fig. 1-1.

Fig. 2-1 is the cross section view of pipeline section residing for a kind of telescopic expansion loop axial limiter of new pretension.

Fig. 2-2 is the structural representation of axial limiter in Fig. 2-1.

Fig. 3-1 is a kind of telescopic expansion loop axial limit structure operating diagram (axial limiter of new pretension Under off working state).

Fig. 3-2 is the partial structurtes enlarged diagram of Fig. 3-1.

Fig. 3-3 is a kind of telescopic expansion loop axial limit structure operating diagram (axial limiter of new pretension During contact inner tube).

Fig. 3-4 is the partial structurtes enlarged diagram of Fig. 3-3.

Fig. 3-5 is a kind of telescopic expansion loop axial limit structure operating diagram (axial limiter of new pretension Under working condition).

Fig. 3-6 is the partial structurtes enlarged diagram of Fig. 3-5.

Wherein, 1 is outer tube, and 1-1 is side section, and 1-2 is thick section, and 1-3 is stage casing, and 1-4 is thin segment, and 1-5 is that outer tube is convex Rise, 2 is overcoat pressure pipe, and 2-1 is that overcoat pressure pipe is raised, and 3 is inner tube, and 4-1 is front roll bearing, and 4-2 is rear rolling bearing, and 5 are Caulking gum layer, 6 is hold-down bolt, and 7 is axial limiter, and 8 is axial limiting groove, and 8-1 is straight plane, and 8-2 is curved surface, 9 For axial limiting handle, 10 is torque spring, and 11 is rotating bolt, and 12 is axial limiting pedestal, and 13 is left sleeve structure, and 14 are the right side Tube-in-tube structure.

Specific embodiment

Below in conjunction with the accompanying drawings the utility model is described in further detail with specific embodiment：

As it is shown in the figures, overall structure of the present utility model is outer tube 1 leading to the overcoat pressure pipe 2 with axial limiter Cross hold-down bolt 6 and connect and compose left sleeve structure 13 and right tube-in-tube structure 14, six sections of axial limiting grooves 8 of welding is interior on outer wall Insert between two sleeves in pipe 3, the side section 1-1 welding conventional pipeline of outer tube both sides, internal diameter and outer tube (the side section of inner tube 1-1 and thick section 1-2) internal diameter size be equal to conventional pipeline size.Axial limiting groove is welded on outer wall of inner tube, axial limiting is recessed Groove includes straight plane 8-1 and curved surface 8-2, and curved surface is identical with the curvature of curved surface of axial limiting handle 9.Inner tube receives axial limit structure (axle To stop 7 and axial limiting groove) act in outer tube and unidirectionally move；The rolling bearing being embedded in outer tube is (front Rolling bearing 4-1 and rear rolling bearing 4-2) contacted by steel ball rolling friction in bearing with inner tube, bearing outside diameter and outer tube Internal diameter is equal, bearing bore diameter be slightly larger than inner tube external diameter, ensure inner and outer pipes it is concentric while, make the phase between inner tube and outer tube To the resistance of motion less than the conventional cannula that rigidity rubs；Two roller bearing shops are the refractory seals rubber being embedded in outer tube wall Layer 5, caulking gum layer is fitted in outer tube wall, and inner tube is inserted in annular rubber layer, and rubber layer has certain elasticity, in it Footpath is slightly less than inner tube external diameter, rubber layer squeezed tight inner tube after installation, to seal pipeline.

Conventional pipeline radius described in the present embodiment is 0.16195m, and wall thickness is 0.0127m.Per the routine of 2000m spacing Pipeline connects the compensator, and for the first time during conveying high-temperature high-pressure medium, pipeline produces compression under temperature and pressure synergy And dilatancy trend, therefore there is relative motion with outer tube in the inner tube of expansion loop, compression is by pipeline telescopic Compensator section is axially elongated to be discharged, and realizes pipe thermal compensation, prevents pipeline from complete buckling destruction occurring；During cooling, pipe Line deflection produced when heating up has the trend of reduction, and the phase contrary with original direction of motion is produced between inner tube and outer tube To movement tendency, but the axial limiting handle of overcoat pressure pipe inwall now will be stuck in the axial limiting groove for being welded on outer wall of inner tube (see Fig. 3-5 and Fig. 3-6), limits pipeline counter motion, and pipeline produces pre-tensile stress because shrinking, in second of pipeline and In all working circulation later, axial limiting makes the pre-tensile stress that pipeline is produced to offset the pressure that part temperature and pressure synergy is produced , there is complete buckling so as to prevent pipeline in stress.

Axial limit structure (axial limiter and axial limiting groove), by including axial limiting pedestal, axial limiting handle, Rotating bolt, the axial limiter of torque spring and the axial limiting groove composition being welded on outer wall of inner tube, its operation principle As shown in Fig. 2-1 and Fig. 2-2.The arrangement number and density of axial limiter are connected the size and pipe of conventional pipeline by compensator Road work temperature and pressure environment determines that the number of distance and axial limiting groove between axial limiting groove is with axial limiter phase one Cause.The present embodiment is related to operating temperature for 93 DEG C, and its axial limiter contains altogether 6 groups, and axial spacing is 0.05m, per group by edge 12 stops being distributed with sectional uniform are constituted.Inner tube with during outer tube relative motion, in torque spring make by axial limiting handle The trend that always oriented original position is rotated with, when near limited impression, axial limiting handle is snapped in axial limiting groove, is reached To axial limiting function.

The utility model has been described in detail above, but the content is only preferred embodiment of the present utility model, It is not to be regarded as limiting practical range of the present utility model.All impartial changes made according to the utility model application range with Improve etc., all should still belong within patent covering scope of the present utility model.

Claims (8)

1. the anti-buckling telescopic expansion loop of a kind of pretension, it is characterised in that：Including outer tube, overcoat pressure pipe, inner tube, pressure Tight bolt, rolling bearing and caulking gum layer；Outer tube is coaxially disposed with overcoat pressure pipe, and the two connects to be formed by hold-down bolt The left sleeve structure and right tube-in-tube structure at telescopic expansion loop two ends, coaxially sets between left sleeve structure and right tube-in-tube structure Inner tube is put, caulking gum layer is set along outer sleeve inner wall, front roll bearing and the rear axis of rolling are set at the two ends of caulking gum layer Hold, on overcoat pressure pipe inwall axial limiter is placed equidistant vertically, the area being located on the outer wall of inner tube on the inside of overcoat pressure pipe Circumferentially be provided with axial limiting groove in domain, the two ends of inner tube be embedded in the front roll bearing of outer tube, caulking gum layer and In rear rolling bearing.

2. the anti-buckling telescopic expansion loop of a kind of pretension according to claim 1, it is characterised in that：Described is outer Sleeve pipe includes that side section, thick section, stage casing, thin segment and outer tube are raised, and side section is used to connect conventional conveyance conduit, side section and thick section With identical internal diameter, thick section, stage casing and thin segment have identical external diameter, and the thickness of thick section tube wall is more than the thickness of stage casing tube wall Degree, the thickness of stage casing tube wall is more than the thickness of thin segment tube wall, and outer tube projection is arranged at the end of thin segment.

3. the anti-buckling telescopic expansion loop of a kind of pretension according to claim 1, it is characterised in that：Described is interior The internal diameter of pipe is equal to the internal diameter of overcoat tube side section and thick section.

4. the anti-buckling telescopic expansion loop of a kind of pretension according to claim 1, it is characterised in that：Described is outer Overcoat pressure pipe projection is provided with the outer wall of set pressure pipe, hold-down bolt is arranged at the overcoat pressure pipe projection and outer tube of overcoat pressure pipe Outer tube projection between.

5. the anti-buckling telescopic expansion loop of a kind of pretension according to claim 1, it is characterised in that：Described is close Envelope rubber layer is arranged on the thin segment inwall of outer tube, caulking gum layer be brought into close contact in outer sleeve inner wall and outer wall of inner tube it Between.

6. the anti-buckling telescopic expansion loop of a kind of pretension according to claim 1, it is characterised in that：Before described Rolling bearing and rear rolling bearing match with inner tube, i.e., the internal diameter of front roll bearing and rear rolling bearing is outer slightly larger than inner tube Steel ball is provided with footpath, front roll bearing and rear rolling bearing, inner tube contacts with the steel ball in bearing.

7. the anti-buckling telescopic expansion loop of a kind of pretension according to claim 1, it is characterised in that：Described axle It is made up of axial limiting pedestal, axial limiting handle, rotating bolt and torque spring to stop, axial limiting pedestal is welded in outer On the inwall of set pressure pipe, totally 4-8 group, is axially equally spaced along pipeline, is made up of 6-16 axial limiting pedestals per group, same group Axial limiting pedestal is uniformly distributed on the same circumference of outer casing pressure inside pipe wall；Axial limiting handle be arranged at axial limiting pedestal it Between, isometrical circular hole is provided with axial limiting pedestal on axial limiting handle, rotating bolt passes through circular hole by axial limiting handle Link together with axial limiting pedestal, two groups of torque springs, the outside of two groups of torque springs are provided with the outside of rotating bolt End is connected respectively with axial limiting pedestal, and the medial extremity of two groups of torque springs is connected respectively with axial limiting handle.

8. the anti-buckling telescopic expansion loop of a kind of pretension according to claim 1, it is characterised in that：Described axle Replace to be connected with curved surface by straight plane to limited impression and constitute, curved surface is identical with the curvature of end curved surface under axial limiting handle, i.e. axle Match with the curved surface of axial limiting groove to spacing handle, it is bent to guarantee that axial limiting handle can be stuck in axial limiting groove The quantity in face is 4-8, identical with the axially arranged quantity of axial limiter, the distance between two adjacent curved surfaces and axial direction The distance between connected axial limiter is equal.