CN113092060B - Experimental device and method for ocean platform stress simulation test - Google Patents
Experimental device and method for ocean platform stress simulation test Download PDFInfo
- Publication number
- CN113092060B CN113092060B CN202110356936.8A CN202110356936A CN113092060B CN 113092060 B CN113092060 B CN 113092060B CN 202110356936 A CN202110356936 A CN 202110356936A CN 113092060 B CN113092060 B CN 113092060B
- Authority
- CN
- China
- Prior art keywords
- pile leg
- connecting disc
- pile
- water tank
- leg
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
The invention provides an experimental device and method for ocean platform stress simulation test, and belongs to the field of ocean oil and gas engineering. The device makes the stress condition of the whole platform model similar to the actual service environment thereof by adjusting the pretension of the return springs arranged at the four corners of the connecting disc and the acting force of the fastening screws between the ends of the universal ball rods and the spherical bearing base, so as to replace the action of soil on the pile legs under the actual service condition, and make the connection rigidity of the pile legs and the bottoms of the pile legs and the water tank base reach the connection with the same actual rigidity. The invention has simple structure, economy and applicability, strong operability and easy realization, and obviously improves the measurement efficiency and the accuracy. In addition, the experimental device can be applied to various pile foundation platforms such as a jacket platform, a tension leg platform and the like, is used for carrying out stress simulation test between an upper structure and an actual soil body, and can also test different data such as horizontal and vertical load force, motion response and the like according to actual engineering requirements.
Description
Technical Field
The invention belongs to the field of ocean oil and gas engineering, relates to an experimental device and method for ocean platform pool model stress simulation test, and particularly relates to an experimental device and method for ocean platform stress simulation test under the action of wave load.
Background
With the deepening of the development and utilization of oil and gas resources by human beings, the oil and gas exploration and development are shifted from land to sea. Therefore, oil and gas production operations are also gradually carried out in the ocean. When oil and gas drilling construction is carried out at sea, the stability and the safety of the offshore platform are more important due to the variable offshore climate, the damage of offshore storms and seabed undercurrents. The pile legs of the platform are immersed in sea waves to bear considerable wave action force, and wave load is one of main external forces borne by the ocean platform, so that the action rule of the wave load on the platform is determined, and the platform has very important effects on strength design and stability calculation of the platform.
The conventional platform wave load stress testing device does not always consider that the pile legs are not rigidly connected with the seabed foundation under the actual condition, so that the complex stress condition of the platform is generated, and the stress state of a platform model with the rigidly connected pile legs and the foundation under the wave load action is only simulated. Based on the experimental device, the invention provides an experimental device for the stress simulation test of the ocean platform, which simulates the composite action of the ocean base on the pile legs by utilizing the stress simulation connecting assembly between the pile legs and the foundation, so that the connection rigidity between the platform model and the foundation and the rigidity of the platform model are the same as the actual rigidity of the platform. Therefore, the platform model under the action of the wave load is subjected to stress simulation experiments, and the method can be used for simulating and measuring a plurality of parameters such as motion response, acceleration, pile leg reaction force and the like of the platform.
Disclosure of Invention
The invention aims to overcome the defects of the existing ocean platform wave load experiment measuring device, provides an experiment device for ocean platform stress simulation test, comprehensively considers and simulates the complex and incomplete rigid connection condition of pile legs and the seabed, and thus provides an accurate and convenient research measuring device for a wave load pool model test.
The technical scheme of the invention is as follows:
an experimental device for a stress simulation test of an ocean platform comprises a self-elevating ocean platform model and a testing device.
The self-elevating marine platform model mainly comprises an upper platform main body model and a pile leg model. Wherein, the upper platform main body model is a triangular hull; the pile leg model comprises three triangular truss pile legs, and the tops of the three triangular truss pile legs are respectively connected to three corners of the triangular ship body. The bottom of each triangular truss pile leg is connected with a testing device through a pile leg bottom plate 1, so that the incomplete linear connection between the bottom of the pile leg and the seabed is simulated.
The testing device comprises a connecting disc A2, a three-way force measuring balance 3, a connecting disc B4, a connecting disc C5, a return spring 6, an underwater tension sensor 7, a screw 8, a universal ball rod end 9, a spherical bearing base 10, a fastening screw 11 and a water tank base 12.
The upper end of the three-way force measuring balance 3 is fixedly connected with a pile leg bottom plate 1 at the bottom of the triangular truss pile leg through a connecting disc A2, and the lower end of the three-way force measuring balance 3 is fixedly connected with a connecting disc B4; the lower surface of the connecting disc B4 is fixedly connected with a square connecting disc C5, the lower surface of the connecting disc C5 is connected with one end of a universal ball rod end 9, the other end of the universal ball rod end 9 is connected with a spherical bearing base 10 through four fastening screws 11, the final connection rigidity and the rigidity of a pile leg are the same as the actual rigidity through the acting force of the four fastening screws 11 between the universal ball rod end 9 and the spherical bearing base 10, and the lower end of the spherical bearing base 10 is fixedly connected with an experimental water tank base 12. Four corners of the connecting disc C5 are respectively connected with four underwater tension sensors 7 through return springs 6, and the underwater tension sensors 7 are connected on the water tank substrate 12 through screws 8.
In actual ballasting, the pile legs extend below the mud surface to be acted by soil mass, and the pile legs and the seabed cannot be simplified into simple fixed connection conditions, so the lower end of the three-way force measuring balance 3 is connected with the water tank base 12 through the universal ball rod end 9 and the spherical bearing base 10, the bottom of the pile legs is rigidly connected with the water tank base as same as the actual stressed condition, and the effect of the seabed soil mass on the pile legs is simulated. The pretension of the return springs 6 mounted at the four corners of the connecting disc C5 and the force of the four fastening screws 11 between the universal ball rod end 9 and the spherical bearing base 10 are adjusted so that the final connection stiffness and the stiffness of the leg itself are the same as the actual stiffness.
An experimental method for measuring the counterforce of the pile leg by adopting the experimental device comprises the following steps:
first, connect the test set
(1) The spud leg bottom plate 1 at the bottom of each triangular truss spud leg is directly and fixedly connected with the upper end of the three-way force measuring balance 3 through a connecting disc A2, and the lower end of the three-way force measuring balance 3 is fixedly connected with a connecting disc C5 through a connecting disc B4.
(2) The bottom of the connecting disc C5 is fixedly connected with one end of a universal ball rod end 9, the other end of the universal ball rod end 9 is connected with a spherical bearing base 10 through four fastening screws 11, and the spherical bearing base 10 is directly and fixedly connected with a water tank base 12, so that the bottom of the triangular truss pile leg is in rigid connection with the water tank base in a simulated mode.
(3) Four underwater tension sensors 7 are respectively connected to four corners of the connecting disc C5 through return springs, and the underwater tension sensors 7 are fixedly connected to the water tank base 12 through screws 8.
(4) By adjusting the pretension of the return springs 6 arranged at four corners of the connecting disc C5 and the acting forces of the four fastening screws 11 between the universal ball rod end 9 and the spherical bearing base 10, the action of a soil body on the pile leg under the actual service condition is replaced, so that the connection rigidity of the pile leg and the bottom of the pile leg and the water tank base reaches the connection similar to the actual rigidity.
Second, testing the counterforce of the pile leg
After the testing devices are connected, a triangular hull of the upper platform main body model is added above the pile leg model to form the whole experimental device; then the whole experimental device is placed in an experimental water tank, and the counterforce of the pile leg in a static state, namely the counterforce of the static pile leg, is measured by a three-way force measuring balance after water injection is completed and the pile leg reaches a balanced state; when the wave load acts on, the pile leg is bent under the action of the wave force, so that the universal ball in the spherical bearing base rotates, and the phenomenon that the pile leg generates a corner in an actual soil body can be simulated. The required rigidity requirement is met through the angle that reset spring adjusted to arrange, pretension isoparametric, can provide the restoring force for the spud leg after the wave load effect simultaneously for the spud leg can get back to the static equilibrium position. Reading time sequence data on the three-dimensional force measuring balance in the experiment process to obtain movable pile leg counter force borne by the pile leg; and adding the static pile leg counter force and the movable pile leg counter force algebra to obtain the final total pile leg counter force.
The invention has the beneficial effects that: the invention provides an experimental device for ocean platform stress simulation test, which can enable the stress condition of the whole platform model to be similar to the actual service environment thereof only by adjusting the pretension of return springs arranged at four corners of a square connecting disc and the acting force of fastening screws between the ends of universal ball rods and a spherical bearing base, thereby replacing the action of soil on pile legs under the actual service condition and enabling the connection rigidity of the pile legs and the bottoms of the pile legs and a water tank base to achieve the connection with the same actual rigidity. The invention has simple structure, economy and applicability, strong operability and easy realization, and obviously improves the measurement efficiency and accuracy. In addition, the experimental device can be arranged at the bottom of the self-elevating offshore platform and connected with the pile leg, and can be used for measuring the pile leg counter force when the offshore platform moves; the test platform can also be applied to various pile foundation platforms such as a jacket platform, a tension leg platform and the like, is used for carrying out stress simulation test between an upper structure and an actual soil body, and can also test different data such as horizontal and vertical load force, motion response and the like according to actual engineering requirements.
Drawings
FIG. 1 is a schematic structural diagram of the experimental apparatus according to the present invention.
FIG. 2 is a graph comparing stiffness measured by different stiffness simulation methods and experimental devices.
In the figure: 1 pile leg bottom plate; 2, connecting a disc A; 3, a three-way force measuring balance; 4, connecting a disc B; 5, connecting a disc C; 6, a return spring; 7, an underwater tension sensor; 8, a screw; 9 universal ball rod end; 10 spherical bearing mount; 11 fastening screws; 12 sink base.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention easier to understand, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
When in use, the method comprises the following specific steps:
first, connect the test set
(1) The pile leg bottom plate 1 of each triangular truss pile leg is directly and fixedly connected with the upper end of the three-way force measuring balance 3 through a connecting disc A2, and the lower end of the three-way force measuring balance 3 is fixedly connected with a connecting disc C5 through a connecting disc B4.
(2) The bottom of the connecting disc C5 is fixedly connected with one end of a universal ball rod end 9, the other end of the universal ball rod end 9 is connected with a spherical bearing base 10 through four fastening screws 11, wherein the spherical bearing base 10 is directly and fixedly connected with a water tank base 12, so that the bottom of the pile leg is in rigid connection with the water tank base 12 in a simulated mode.
(3) Four underwater tension sensors 7 are respectively connected to four corners of the connecting disc C5 through return springs, and the underwater tension sensors 7 are fixedly connected to the water tank base 12 through screws 8.
(4) By adjusting the pretension of the return springs 6 arranged at four corners of the connecting disc C5 and the acting forces of the four fastening screws 11 between the universal ball rod end 9 and the spherical bearing base 10, the action of a soil body on the pile leg under the actual service condition is replaced, so that the connection rigidity of the pile leg and the bottom of the pile leg and the water tank base reaches the connection similar to the actual rigidity.
Second, testing the counterforce of the pile leg
After the testing devices are connected, a triangular hull of the upper platform main body model is added above the pile leg model to form the whole experimental device; then the whole experimental device is placed in an experimental water tank, and the counterforce of the pile leg in a static state, namely the counterforce of the static pile leg, is measured by a three-way force measuring balance after water injection is completed and the pile leg reaches a balanced state; when the wave load acts on, the pile leg is bent under the action of the wave force, so that the universal ball in the spherical bearing base rotates, and the phenomenon that the pile leg generates a corner in an actual soil body can be simulated. The required rigidity requirement is met through the angle that reset spring adjusted to arrange, pretension isoparametric, can provide the restoring force for the spud leg after the wave load effect simultaneously for the spud leg can get back to the static equilibrium position. Reading time sequence data on the three-dimensional force measuring balance in the experiment process to obtain movable pile leg counter force borne by the pile leg; and adding the static pile leg counter force and the movable pile leg counter force algebra to obtain the final total pile leg counter force.
When simulating the rigidity of the pile leg of the ocean platform, firstly, a test that a pile leg model is directly and fixedly connected with the bottom of the water tank (namely, a connecting disc B4 forming the bottom of the three-way force measuring balance is directly and fixedly connected with the water tank base 12) is carried out, and the rigidity of the experimental device is measured, as shown in fig. 2, the rigidity of the pile leg simulated by the experimental device is about 1046N/m; after the experimental set-up according to the invention was added, the stiffness of the leg model was measured again after adjusting the bottom tightening screws, as shown by the grey line in fig. 2, which is about 201N/m. Therefore, the experimental device can effectively adjust the rigidity of the pile leg model through the lower device, so that the rigidity of the pile leg model meets the requirements required by experiments.
Claims (1)
1. A method for measuring the counterforce of a pile leg is characterized in that the method is realized based on an experimental device for a stress simulation test of an ocean platform, and the experimental device comprises a self-elevating ocean platform model and a testing device;
the self-elevating marine platform model comprises an upper platform main body model and a pile leg model; the upper platform main body model is a triangular ship body, the pile leg model comprises three triangular truss pile legs, and the tops of the three triangular truss pile legs are respectively connected to three corners of the triangular ship body; the bottom of each triangular truss pile leg is connected with a testing device through a pile leg bottom plate (1) so as to simulate the incomplete linear connection between the bottom of the pile leg and the seabed;
the testing device comprises a connecting disc A (2), a three-way force measuring balance (3), a connecting disc B (4), a connecting disc C (5), a return spring (6), an underwater tension sensor (7), a screw (8), a universal ball rod end (9), a spherical bearing base (10), a fastening screw (11) and a water tank base (12);
the upper end of the three-way force measuring balance (3) is fixedly connected with a pile leg bottom plate (1) at the bottom of the triangular truss pile leg through a connecting disc A (2), and the lower end of the three-way force measuring balance (3) is fixedly connected with a connecting disc B (4); the lower surface of the connecting disc B (4) is fixedly connected with a connecting disc C (5), the lower surface of the connecting disc C (5) is connected with one end of a universal ball rod end (9), the other end of the universal ball rod end (9) is connected with a spherical bearing base (10) through a fastening screw (11), and the final connection rigidity and the rigidity of the pile leg are the same as the actual rigidity through the acting force of four fastening screws (11) between the universal ball rod end (9) and the spherical bearing base (10); the lower end of the spherical bearing base (10) is fixedly connected with a water tank base (12);
four corners of the connecting disc C (5) are respectively connected with four underwater tension sensors (7) through return springs (6), and the underwater tension sensors (7) are connected to a water tank substrate (12) through screws (8); the method comprises the following steps:
first, connect the test set
(1) A pile leg bottom plate (1) at the bottom of each triangular truss pile leg is directly and fixedly connected with the upper end of a three-way force measuring balance (3) through a connecting disc A (2), and the lower end of the three-way force measuring balance (3) is fixedly connected with a connecting disc C (5) through a connecting disc B (4);
(2) the bottom of the connecting disc C (5) is fixedly connected with one end of a universal ball rod end (9), the other end of the universal ball rod end (9) is connected with a spherical bearing base (10) through a fastening screw (11), and the spherical bearing base (10) is directly and fixedly connected with a water tank base (12), so that the bottom of the triangular truss pile leg is in rigid connection with the water tank base in a simulated mode;
(3) four corners of the connecting disc C (5) are respectively connected with four underwater tension sensors (7) through return springs (6), and the underwater tension sensors (7) are fixedly connected on a water tank substrate (12) through screws (8);
(4) the pile leg is replaced by the action of a soil body on the pile leg under the actual service condition by adjusting the pretension of return springs (6) arranged at four corners of a connecting disc C (5) and the acting forces of four fastening screws (11) between a universal ball rod end (9) and a spherical bearing base (10), so that the connection rigidity of the pile leg and the bottom of the pile leg and the water tank base reaches the connection with the same actual rigidity;
second, testing the counterforce of the pile leg
After the testing devices are connected, a triangular hull of the upper platform main body model is added above the pile leg model to form the whole experimental device; then the whole experimental device is placed in an experimental water tank, and when water injection is completed and the device reaches a balance state, the counterforce of the pile leg in a static state, namely the counterforce of the static pile leg, is measured by a three-way force measuring balance; when the wave load acts, the pile leg is bent under the action of the wave force, so that the universal ball in the spherical bearing base rotates, and the phenomenon that the pile leg generates a corner in an actual soil body is simulated; the arrangement angle and pretension are adjusted through the return spring to meet the required rigidity requirement, and meanwhile, the return spring provides restoring force for the pile leg under the action of wave load, so that the pile leg can return to a static balance position; reading time sequence data on the three-dimensional force measuring balance in the experiment process to obtain movable pile leg counter force borne by the pile leg; and adding the static pile leg counter force and the movable pile leg counter force algebra to obtain the final total pile leg counter force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110356936.8A CN113092060B (en) | 2021-04-01 | 2021-04-01 | Experimental device and method for ocean platform stress simulation test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110356936.8A CN113092060B (en) | 2021-04-01 | 2021-04-01 | Experimental device and method for ocean platform stress simulation test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113092060A CN113092060A (en) | 2021-07-09 |
| CN113092060B true CN113092060B (en) | 2022-02-22 |
Family
ID=76672645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110356936.8A Active CN113092060B (en) | 2021-04-01 | 2021-04-01 | Experimental device and method for ocean platform stress simulation test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113092060B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202433213U (en) * | 2011-12-28 | 2012-09-12 | 中国海洋石油总公司 | Test device for dynamic load lower conduit rack platform pile-soil action |
| CN106596040A (en) * | 2016-11-03 | 2017-04-26 | 东北石油大学 | Marine environment load simulating method |
| CN109723091A (en) * | 2017-10-27 | 2019-05-07 | 中国海洋大学 | A kind of experimental provision measuring three spud leg wave loadings of drilling platforms |
| CN109916724A (en) * | 2019-01-21 | 2019-06-21 | 昆明理工大学 | A kind of experimental rig excavating Unloading Mechanics response process for simulating underground Rock And Soil |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4696603A (en) * | 1985-12-05 | 1987-09-29 | Exxon Production Research Company | Compliant offshore platform |
| CN201464154U (en) * | 2009-04-23 | 2010-05-12 | 中国海洋石油总公司 | Environmental load measuring device of oceaneering model |
| KR101368887B1 (en) * | 2012-06-28 | 2014-03-04 | 삼성중공업 주식회사 | Floating structure and control method thereof |
| CN204758256U (en) * | 2015-06-29 | 2015-11-11 | 中国海洋大学 | From lift -type platform spud leg wave current load factor testing experiment system |
| CN207730571U (en) * | 2018-01-30 | 2018-08-14 | 中国海洋大学 | A kind of multifactor wave loadings coefficient concurrent testing experimental system of self-elevating ocean platform spud leg chord member |
| CN108589736B (en) * | 2018-03-22 | 2019-07-23 | 中交路桥北方工程有限公司 | A kind of Foundation Pit Support Design method |
| CN109914496B (en) * | 2019-04-02 | 2021-02-05 | 东北石油大学 | Method capable of simulating rigidity weakening of self-elevating platform pile foundation and pile leg |
-
2021
- 2021-04-01 CN CN202110356936.8A patent/CN113092060B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202433213U (en) * | 2011-12-28 | 2012-09-12 | 中国海洋石油总公司 | Test device for dynamic load lower conduit rack platform pile-soil action |
| CN106596040A (en) * | 2016-11-03 | 2017-04-26 | 东北石油大学 | Marine environment load simulating method |
| CN109723091A (en) * | 2017-10-27 | 2019-05-07 | 中国海洋大学 | A kind of experimental provision measuring three spud leg wave loadings of drilling platforms |
| CN109916724A (en) * | 2019-01-21 | 2019-06-21 | 昆明理工大学 | A kind of experimental rig excavating Unloading Mechanics response process for simulating underground Rock And Soil |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113092060A (en) | 2021-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chandrasekaran et al. | Dynamic behaviour of square and triangular offshore tension leg platforms under regular wave loads | |
| Shi et al. | A study on the effect of different modeling parameters on the dynamic response of a jacket-type offshore wind turbine in the Korean Southwest Sea | |
| Sirnivas et al. | Coupled mooring analyses for the wec-sim wave energy converter design tool | |
| Armesto et al. | Telwind: Numerical analysis of a floating wind turbine supported by a two bodies platform | |
| CN110108470B (en) | Suspension tunnel physical model test device and test method | |
| Borg et al. | Elastic deformations of floaters for offshore wind turbines: dynamic modelling and sectional load calculations | |
| Faraggiana et al. | Computational modelling and experimental tank testing of the multi float WaveSub under regular wave forcing | |
| Bosma et al. | WEC-Sim phase 1 validation testing: experimental setup and initial results | |
| Jagdale et al. | Practical simulation on motions of a TLP-type support structure for offshore wind turbines | |
| CN113092060B (en) | Experimental device and method for ocean platform stress simulation test | |
| Tomasicchio et al. | Design of a 3D physical and numerical experiment on floating off-shore wind turbines | |
| Johannessen et al. | Extreme wave effects on deep water Tlps lessons learned from the Snorre a model tests | |
| Zhu et al. | Dynamic performance of a semi-submersible platform subject to wind and waves | |
| CN114279733B (en) | Test device, method and application for researching dynamic response of floating nuclear power platform | |
| Chung et al. | Comparison study and forensic analysis between experiment and coupled dynamics simulation for submerged floating tunnel segment with free ends under wave excitations | |
| Sun et al. | Dynamic response analysis of ddms platform subjected to actions of wave groups and current fources | |
| CN109723091B (en) | Experimental device for measuring wave current load of three spud legs of drilling platform | |
| Hsu et al. | Experimental study of floating offshore platform in combined wind/wave/current environment | |
| Daun et al. | Impact loads on the self-elevating unit during jacking operation | |
| Wu et al. | Experimental study on the tension of cables and motion of tunnel element for an immersed tunnel element under wind, current and wave | |
| Alwan et al. | Investigation of Wave Forces on Fixed Monopile Foundation of Offshore Wind Turbine | |
| Damiani et al. | Spar buoy numerical model calibration and verification | |
| Kurian et al. | Hydrodynamic response of tension-leg platforms—A model | |
| Gubesch et al. | Experimental hydrodynamic investigation of a co-located wind turbine and wave energy converter | |
| Dharanikota et al. | Numerical And Experimental Methods For Offshore Wind Turbine Design-A Review |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |