CN105259038A - Pipeline heave resistance performance testing device on super-gravity condition - Google Patents
Pipeline heave resistance performance testing device on super-gravity condition Download PDFInfo
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Abstract
The invention discloses a buried pipeline heave soil resistance performance testing device on the super-gravity condition, and belongs to the technical field of pipeline heave centrifugal tests. The device comprises a centrifugal machine, a model casing, a foundation soil body, a pipeline device, a dowel bar system, a displacement testing device, a pipeline drawing force loading system and a counterforce beam. The model casing is installed inside a hanging basket of the centrifugal machine. The pipeline device is buried inside the foundation soil body of the model casing. The dowel bar system comprises an axial force meter and a force transfer cylinder. The displacement testing device comprises a laser displacement sensor and a laser receiving piece and is in rigid connection with a load loading platform. The pipeline drawing force loading system comprises a motor, a speed reduction spiral lifter system, a screw rod, the load loading platform and a hexagonal screw located at the end of the screw rod. The load loading platform and the counterforce beam are fixed through a bolt. The counterforce beam and the model casing are fixed through a bolt. The device is simple in structure, wide in application range and convenient to popularize, and solves the problem of centrifugal acceleration stage pipe-soil displacement coordination.
Description
Technical field
The invention belongs to pipeline protuberance centrifugal test technical field, be specifically related to buried pipeline protuberance resistance of soil performance testing device under a kind of hypergravity condition.
Background technology
Long distance pipeline is major way and the approach of oil gas transport in global range, has the advantages that caliber is large, haul distance is long, pressure is high, throughput rate is large.But in the situation such as tomography, High Temperature High Pressure, shallow embedding pipeline more easily bending deformation occurs, wherein most of unstable failure form shows as and vertically swells distortion.The vertical drag that in pipeline protuberance process, upper earthing body can provide correctly is provided, contributes to determining rational pipe engineering design proposal, propose reinforcement measure targetedly, ensure the safety of pipe engineering.
Hydro-extractor can reproduce prototype stress-strain field, directly can measure on prototype large-diameter pipeline and cover resistance of soil, is that research large-diameter pipeline vertically swells the effective tool of characteristic.But not yet have the pipeline Resistant heave performance testing device that can be used on hydro-extractor, the test of pipeline protuberance resistance of soil performance adopts normal gravity test method usually, only can study small diameter pipeline; In process of the test, pipeline protuberance phenomenon realizes mainly through the means applying a vertical external force to pipeline, and pipeline and charger adopt and be rigidly connected.If existing experiment test device to be applied to model centrifuge test, on the one hand lifting jack charger volume and conduct oneself with dignity excessive, in high accelerating field, Installation and adjustment is extremely inconvenient; On the other hand, by the rigidly connected restriction of charger, in hydro-extractor accelerator, between pipeline and the soil body, displacement cannot be coordinated, thus causes experimental test erroneous results.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, buried pipeline protuberance resistance of soil performance testing device under a kind of hypergravity condition is provided.
The object of the invention is to be achieved through the following technical solutions: pipeline Resistant heave performance testing device under a kind of hypergravity condition, comprises hydro-extractor, model casing, plumbing installation, transmission rod system, displacement tester, pipeline pulling capacity loading system and reaction beam.Described model casing is installed in centrifugal basket, is equipped with foundation soil body in model casing, is embedded with plumbing installation in foundation soil body.Described plumbing installation comprises model pipeline, pipeline force transmission ring and pipeline pull bar three part; Pipeline force transmission ring is enclosed within model pipeline outside, and pipeline pull bar and pipeline force transmission ring are mechanically connected.Described reaction beam is made up of two square steel, and two square steel are parallel to be fixed on model casing.Described pipeline pulling capacity loading system comprises the hex(agonal)screw being installed on motor outside model casing, deceleration helical riser system, screw rod, load weighted platform and being positioned at screw rod end; Motor is fixed in deceleration helical riser system, and deceleration helical riser system is fixed on load weighted platform, and load weighted platform is fixed by bolt and reaction beam.Transmission rod system comprises axle power meter and power transmission cylinder; Axle power meter lower end and plumbing installation link together; Described power transmission cylinder comprises power transmission cylinder hexagon socket head cap screw, hollow power transmission cylinder and power transmission cylinder connecting link; Hollow power transmission cylinder is connected with axle power meter by hexagon socket head cap screw, is fixed by connecting link and pipeline pulling capacity loading system, and hollow power transmission cylinder and power transmission cylinder hexagon socket head cap screw are not in contact with each other.Displacement tester comprises laser displacement sensor and laser blank film; Laser displacement sensor and load weighted platform are rigidly connected, and laser blank film is installed on above axle power meter.
Further, described foundation soil body material need be selected according to concrete test condition, comprises the multiple earthen foundations such as sand, clay, silt.
Further, described model pipeline material can be aluminium, steel, concrete, pvc or organic glass etc., and concrete size is selected according to test situation; Described pipeline force transmission ring internal diameter 1mm larger than model pipeline external diameter, pipeline force transmission ring top has diameter 10mm screw, and pipeline pull bar is mechanically connected by this screw and pipeline force transmission ring, pipeline pull bar diameter 10mm.Pipeline force transmission ring and pull bar are made by aluminium, and deadweight is comparatively light, and the strength and stiffness of energy needed for warranty test.
Further, leave spacing (about 8mm) between described hollow power transmission cylinder and power transmission cylinder hexagon socket head cap screw, before electric motor starting, be not in contact with each other between the two, to ensure that hydro-extractor is at boost phase pipeclay displacement coordination.
Further, described motor and deceleration helical riser system are screwed, can be conveniently replaced.Deceleration helical riser system can be driven in motor operation course, screw rod is produced upwards or downward displacement.The hex(agonal)screw of screw rod end is used for fixing force transfer lever system, does not produce relative deformation in warranty test process between screw rod, power transmission cylinder connecting link and hollow power transmission cylinder.Load weighted platform corner place has hole, is that the bolt of 12mm and reaction beam are fixed by 4 diameters.
Further, the square steel that described reaction beam is 4cm × 6cm by two long 70cm, sectional dimension forms, and corresponding position, square steel two ends has screw, is that the bolt of 12mm and model casing are fixed by 4 diameters.
Compared with prior art, the invention has the beneficial effects as follows:
(1) structure of the present invention is simple, strong operability, easy accessibility, and is easy to transformation, can develop new purposes according to original system framework.
(2) pipeline pulling capacity loading system and model casing separate, avoid the restriction that test model case interior space dimension after sample preparation is narrow, and be suitable for various model method of preparing sample.
(3) applicability of the present invention is wide, is applicable to the ground of the multiple soil property type such as clay, silt.
(4) arrange power transmission cartridge in transmission rod system, meet on the rigidly connected basis of loading system, to realize in hydro-extractor accelerator displacement coordination between pipeline and the soil body, warranty test test result is correctly reliable.
(5) this equipment principle is simple, can be used for the pipeline protuberance test of different tube diameters, different embedding position, different buried depth ratio, can simulate different protuberance speed and upwaarping deformation simultaneously.
(6) of the present invention to realize cost low, and result of use is good, is convenient to promote the use of.
Accompanying drawing explanation
Fig. 1 is vertical view of the present invention;
Fig. 2 is A-A sectional view of the present invention;
Fig. 3 is B-B sectional view of the present invention;
Fig. 4 is transmission rod system architecture detail drawing;
Fig. 5 is hydro-extractor principle of work schematic diagram;
In figure: hydro-extractor 1; Centrifugal basket 1-1; Model casing 2; Foundation soil body 3; Plumbing installation 4; Model pipeline 4-1; Pipeline force transmission ring 4-2; Pipeline pull bar 4-3; Transmission rod system 5; Axle power meter 6; Power transmission cylinder 7; Power transmission cylinder hexagon socket head cap screw 7-1; Hollow power transmission cylinder 7-2; Power transmission cylinder connecting link 7-3; Displacement tester 8; Laser displacement sensor 8-1; Laser blank film 8-2; Pipeline pulling capacity loading system 9; Motor 9-1; Deceleration helical riser system 9-2; Screw rod 9-3; Load weighted platform 9-4; Reaction beam 10.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, 2, 3, the present invention is pipeline Resistant heave performance testing device under hypergravity condition, comprises hydro-extractor 1, model casing 2, plumbing installation 4, transmission rod system 5, displacement tester 8, pipeline pulling capacity loading system 9 and reaction beam 10.
Described model casing 2 is installed in hydro-extractor 1 hanging basket 1-1, is equipped with foundation soil body 3 in model casing 2, and foundation soil body 3 material is selected according to concrete test condition, comprises the ground of the multiple soil property types such as sand, clay, silt.Plumbing installation 4 is embedded with in foundation soil body 3.
Described plumbing installation 4 comprises model pipeline 4-1, pipeline force transmission ring 4-2 and pipeline pull bar 4-3 tri-part.Model pipeline 4-1 material can be aluminium, steel, concrete, pvc or organic glass etc., and concrete size is selected according to test situation.It is outside that pipeline force transmission ring 4-2 is enclosed within model pipeline 4-1, its internal diameter about 1mm larger than model pipeline 4-1 external diameter, pipeline force transmission ring 4-2 top has diameter 10mm screw, and pipeline pull bar 4-3 is mechanically connected by this screw and pipeline force transmission ring 4-2, pipeline pull bar 4-3 diameter 10mm.Pipeline force transmission ring 4-2 and pull bar 4-3 makes by aluminium, and deadweight is comparatively light, and the strength and stiffness of energy needed for warranty test.
As shown in Figure 4, described transmission rod system 5 comprises axle power meter 6 and power transmission cylinder 7.Described power transmission cylinder 7 comprises power transmission cylinder hexagon socket head cap screw 7-1, hollow power transmission cylinder 7-2 and power transmission cylinder connecting link 7-3.Hollow power transmission cylinder 7-2 is connected with axle power meter 6 by hexagon socket head cap screw 7-1, is fixed by connecting link 7-3 and pipeline pulling capacity loading system 9.In device installation process, must stay (about 8mm) at regular intervals between hollow power transmission cylinder 7-2 and power transmission cylinder hexagon socket head cap screw 7-1, keep not contact condition, to ensure hydro-extractor 1 boost phase pipeclay displacement coordination.Axle power meter 6 lower end and plumbing installation 4 link together.
As shown in Figure 1, 2, 3, described displacement tester 8 comprises laser displacement sensor 8-1 and laser blank film 8-2.Laser displacement sensor 8-1 and load weighted platform 9-4 is rigidly connected, and in process of the test, laser displacement sensor 8-1 and model casing 2 keep geo-stationary; Laser blank film 8-2 is installed on above axle power meter 6, keeps geo-stationary with plumbing installation 4.Laser sensor 8-1 carrys out the actual displacement of measurement model pipeline 4-1 by induction laser blank film 8-2.
Described pipeline pulling capacity loading system 9 comprises the hex(agonal)screw 9-5 being installed on motor 9-1 outside model casing, deceleration helical riser system 9-2, screw rod 9-3, load weighted platform 9-4 and being positioned at screw rod 9-3 end.Deceleration helical riser system 9-2 is fixed on load weighted platform 9-4, is screwed between motor 9-1 and deceleration helical riser system 9-2, can be conveniently replaced.Deceleration helical riser system 9-2 can be driven in motor 9-1 operational process, screw rod 9-3 is produced upwards or downward displacement.The hex(agonal)screw 9-5 of screw rod 9-3 end is used for fixing force transfer lever system 5, does not produce relative deformation in warranty test process between screw rod 9-3, power transmission cylinder connecting link 7-3 and hollow power transmission cylinder 7-2.Load weighted platform 9-4 tetra-jiaos of places have hole, are that the bolt of 12mm and reaction beam 10 are fixed by 4 diameters.
The square steel that described reaction beam 10 is 4cm × 6cm by two long 70cm, sectional dimension forms, and corresponding position, square steel two ends has screw, is that the bolt of 12mm and model casing 2 are fixed by 4 diameters.
Principle of work of the present invention is as follows:
In model casing 2, foundation soil body 3 material is filled before test, when foundation soil body 3 reaches burying depth designed, disposed tubes duct device 4, then cover residue foundation soil body 3, complete the preparation of ground, pipeline protuberance test front court model.Axle power meter 6 being fixed with adding long nut with pipeline connecting link 4-3, above axle power meter 6, placing laser blank film 8-2 simultaneously.Reaction beam 10 is installed above model casing 2, subsequently pipeline pulling capacity loading system 9 is placed in precalculated position, and plumbing installation 4, transmission rod system 5 and pipeline pulling capacity loading system 9 three are connected and fixed.In device installation process, hexagon socket head cap screw 7-1 can not contact with hollow power transmission cylinder 7-2, must stay at regular intervals between the two, about 8mm, as shown in Figure 2,3, 4.
As shown in Figure 5, model casing 2 is arranged on hydro-extractor 1 hanging basket 1-1, after connecting data collecting instrument, opens hydro-extractor 1 and test.In CENTRIFUGAL ACCELERATING process, by the rigidly connected constraint of reaction beam 10, pipeline pulling capacity loading system 9, laser displacement sensor 8-1, power transmission cylinder connecting link 7-3 and hollow power transmission cylinder 7-2 do not produce displacement deformation; Foundation soil body 3 is subject to hypergravity effect, can produce corresponding sedimentation, about 5mm; Plumbing installation 4, axle power meter 6 and power transmission cylinder hexagon socket head cap screw 7-1 can sink along with the sedimentation and deformation of the soil body.Before test, contactless between the bolt head of hexagon socket head cap screw 7-1 and hollow power transmission cylinder 7-3, and leave enough spacing between the two, therefore in the CENTRIFUGAL ACCELERATING stage, pipeline pulling capacity loading system 9 can not the displacement of restriction conduit device 4, displacement coordination can be kept, the accuracy of warranty test result between pipeline and the soil body.Hydro-extractor 1 accelerates to setting G value, and after the soil body no longer deforms, open motor 9-1, in pulling capacity loading system, the screw rod 9-3 of 9 starts to top offset under the drive of motor 9-1, and power transmission cylinder connecting link 7-3 and hollow power transmission cylinder 7-2 also moves thereupon.After a period of time, hollow power transmission cylinder 7-2 starts to contact with power transmission cylinder hexagon socket head cap screw 7-1, and plumbing installation 4 is subject to uplift force effect with screw rod 9-3 at the uniform velocity to top offset.Pipeline pulls out in process, laser displacement sensor 8-1 and axle power meter 6 can the displacement of measuring channel in real time and axle power, until displacement reaches test design value, disable motor, stops test.
Claims (6)
1. pipeline Resistant heave performance testing device under a hypergravity condition, it is characterized in that, comprise hydro-extractor (1), model casing (2), plumbing installation (4), transmission rod system (5), displacement tester (8), pipeline pulling capacity loading system (9) and reaction beam (10).Described model casing (2) is installed in hydro-extractor (1) hanging basket (1-1), be equipped with foundation soil body (3) in model casing (2), in foundation soil body (3), be embedded with plumbing installation (4).Described plumbing installation (4) comprises model pipeline (4-1), pipeline force transmission ring (4-2) and pipeline pull bar (4-3) three part; It is outside that pipeline force transmission ring (4-2) is enclosed within model pipeline (4-1), and pipeline pull bar (4-3) and pipeline force transmission ring (4-2) are mechanically connected.Described reaction beam (10) is made up of two square steel, and two square steel are parallel to be fixed on model casing (2).Described pipeline pulling capacity loading system (9) comprises the hex(agonal)screw (9-5) being installed on motor (9-1) outside model casing, deceleration helical riser system (9-2), screw rod (9-3), load weighted platform (9-4) and being positioned at screw rod (9-3) end; Motor (9-1) is fixed in deceleration helical riser system (9-2), deceleration helical riser system (9-2) is fixed on load weighted platform (9-4), and load weighted platform (9-4) is fixed by bolt and reaction beam (10).Transmission rod system (5) comprises axle power meter (6) and power transmission cylinder (7); Axle power meter (6) lower end and plumbing installation (4) link together; Described power transmission cylinder (7) comprises power transmission cylinder hexagon socket head cap screw (7-1), hollow power transmission cylinder (7-2) and power transmission cylinder connecting link (7-3); Hollow power transmission cylinder (7-2) is connected with axle power meter (6) by hexagon socket head cap screw (7-1), fixed by connecting link (7-3) and pipeline pulling capacity loading system (9), hollow power transmission cylinder (7-2) and power transmission cylinder hexagon socket head cap screw (7-1) are not in contact with each other.Displacement tester (8) comprises laser displacement sensor (8-1) and laser blank film (8-2); Laser displacement sensor (8-1) and load weighted platform (9-4) are rigidly connected, and laser blank film (8-2) is installed on axle power meter (6) top.
2. pipeline Resistant heave performance testing device under hypergravity condition according to claim 1, is characterized in that, described foundation soil body (3) material comprises the multiple earthen foundations such as sand, clay, silt.
3. pipeline Resistant heave performance testing device under hypergravity condition according to claim 1, is characterized in that, described model pipeline (4-1) material can be aluminium, steel, concrete, pvc or organic glass etc.; Described pipeline force transmission ring (4-2) internal diameter 1mm larger than model pipeline (4-1) external diameter, pipeline force transmission ring (4-2) top has diameter 10mm screw, pipeline pull bar (4-3) is mechanically connected by this screw and pipeline force transmission ring (4-2), pipeline pull bar (4-3) diameter 10mm.Pipeline force transmission ring (4-2) and pull bar (4-3) are made by aluminium.
4. pipeline Resistant heave performance testing device under hypergravity condition according to claim 1, it is characterized in that, spacing is left between described hollow power transmission cylinder (7-2) and power transmission cylinder hexagon socket head cap screw (7-1), motor (9-1) is not in contact with each other before starting between the two.
5. pipeline Resistant heave performance testing device under hypergravity condition according to claim 1, is characterized in that, described motor (9-1) and deceleration helical riser system (9-2) are screwed.Deceleration helical riser system (9-2) can be driven in motor (9-1) operational process, screw rod (9-3) is produced upwards or downward displacement.The hex(agonal)screw (9-5) of screw rod (9-3) end, for fixing force transfer lever system (5), does not produce relative deformation between screw rod (9-3), power transmission cylinder connecting link (7-3) and hollow power transmission cylinder (7-2) in warranty test process.Load weighted platform (9-4) corner place has hole, is that the bolt of 12mm and reaction beam (10) are fixed by 4 diameters.
6. pipeline Resistant heave performance testing device under hypergravity condition according to claim 1, it is characterized in that, the square steel that described reaction beam (10) is 4cm × 6cm by two long 70cm, sectional dimension forms, corresponding position, square steel two ends has screw, is that the bolt of 12mm and model casing (2) are fixed by 4 diameters.
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| CN105806575A (en) * | 2016-03-25 | 2016-07-27 | 浙江大学 | Device for measuring force on subsurface structure under dynamic centrifuge test conditions |
| CN109285436A (en) * | 2018-11-08 | 2019-01-29 | 南京大学 | Strike-slip fault zone physical simulation experiment device and experimental method for Elevated Gravity |
| CN105806575B (en) * | 2016-03-25 | 2019-07-16 | 浙江大学 | Underground structure forces testing device under the conditions of power centrifugal test |
| CN110243413A (en) * | 2019-06-27 | 2019-09-17 | 浙江大学 | A kind of monitoring device and monitoring method of hypergravity centrifugal model physical state |
| CN110261238A (en) * | 2019-06-20 | 2019-09-20 | 浙江大学 | The fixed multi- scenarios method of Elevated Gravity acts on lower material properties test system |
| CN116793837A (en) * | 2023-06-07 | 2023-09-22 | 中国科学院力学研究所 | Dynamic stress simulation device and method for pipeline in soft clay seabed environment |
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| CN116793837A (en) * | 2023-06-07 | 2023-09-22 | 中国科学院力学研究所 | Dynamic stress simulation device and method for pipeline in soft clay seabed environment |
| CN116793837B (en) * | 2023-06-07 | 2024-04-05 | 中国科学院力学研究所 | Dynamic stress simulation device and method for pipeline in soft clay seabed environment |
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