CN108253881B - Offshore oil platform pile foundation washout pit form measuring device and using method - Google Patents
Offshore oil platform pile foundation washout pit form measuring device and using method Download PDFInfo
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- CN108253881B CN108253881B CN201810048615.XA CN201810048615A CN108253881B CN 108253881 B CN108253881 B CN 108253881B CN 201810048615 A CN201810048615 A CN 201810048615A CN 108253881 B CN108253881 B CN 108253881B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000009991 scouring Methods 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/26—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring depth
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
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- Geophysics And Detection Of Objects (AREA)
Abstract
A device for measuring the form of a pile foundation washout pit of an offshore oil platform and a using method thereof are disclosed, the device comprises a reference plate, a resistance rod, a counterweight, an electrode plate and a measurer, wherein the reference plate is fixed on a seabed surface around the pile foundation, the resistance rod penetrates through the reference plate, the counterweight is fixedly connected to the resistance rod and is arranged on the seabed surface below the reference plate, the electrode plate is fixedly connected to the reference plate and is abutted to the outside of the resistance rod, and the top end of the resistance rod and the electrode plate are both connected with the measurer; when the sea bed surface around the pile foundation descends and scouring pits appear, the weight part moves downwards to drive the resistance rod to move downwards so that the electrode plates are abutted to different positions of the resistance rod, and the resistance value measured by the measurer is reduced and converted into the depth value of the scouring pits. By arranging a plurality of groups of measuring devices on the reference plate, the surface of the seabed around the pile foundation covered by the reference plate can be respectively measured, and the form change of the scour pit in the plane can be drawn. The device has the advantages of simple structure, low cost, convenient implementation and higher precision, and is suitable for large-area popularization and use.
Description
Technical Field
The invention relates to a device for measuring the form of a pile foundation scour pit of an offshore oil platform and a using method thereof.
Background
With the continuous development of seabed oil and gas resources, various ocean platforms are increasing day by day, after the platforms are built, a local water flow power field around a pile foundation changes, secondary flow is formed in front of the pile foundation, eddy current is formed around the pile foundation, the flow velocity around the pile foundation is accelerated, mud and sand particles are started and moved, the seabed soil body around the pile foundation is scoured to a certain degree, a scour pit is formed, and the stability of the platforms is further influenced. Many scholars study the influence of ocean water power on the formation of the scoured pits, measure the pit form by adopting a water depth measurement method, and some scholars simulate the pit formation by adopting an indoor model test. For the pit form, the water depth measurement method needs to calibrate the water level elevation, and the test work is relatively complicated. Other convenient measuring devices have not been seen so far.
Disclosure of Invention
The invention provides a device for measuring the form of a pile foundation scour pit of an offshore oil platform and a using method thereof, which overcome the defects in the background art. One of the technical schemes adopted by the invention for solving the technical problems is as follows:
the utility model provides an offshore oil platform pile foundation scour pit form measuring device which characterized in that: the method comprises the following steps: the pile foundation measuring device comprises a reference plate, a resistance rod, a balance weight, an electrode plate and a measurer, wherein the reference plate is fixed on a seabed surface around a pile foundation, the resistance rod penetrates through the reference plate, the balance weight is fixedly connected to the resistance rod and is arranged on the seabed surface below the reference plate, the electrode plate is fixedly connected to the reference plate and is abutted to the outside of the resistance rod, and the top end of the resistance rod and the electrode plate are both connected with the measurer;
when the sea bed surface around the pile foundation descends and scouring pits appear, the weight part moves downwards to drive the resistance rod to move downwards so that the electrode plates are abutted to different positions of the resistance rod, and the resistance value measured by the measurer is reduced and converted into the depth value of the scouring pits.
In a preferred embodiment, the reference plate is provided with a through hole, a guide member is fixedly arranged at the through hole, the guide member is provided with a guide opening and a guide cavity communicated with the guide opening, the resistance rod extends into the guide cavity from the guide opening, the counterweight member is positioned in the guide cavity, and the electrode plate is fixedly connected to the top end of the guide member.
In a preferred embodiment, the resistance wire is wound around the resistance rod, the resistance wire at the top end of the resistance rod is connected with the measurer through a conducting wire, and the electrode plate is abutted against the resistance wire and is connected with the measurer through a conducting wire.
In a preferred embodiment, the electrode plate includes a planar portion and a bent portion connected to the planar portion, the planar portion is fixedly connected to the reference plate, and the bent portion abuts against the outer periphery of the resistor.
In a preferred embodiment, the number of the through holes is set to be a plurality and is uniformly distributed on the reference plate, the number of the guide pieces is set to be a plurality and is in one-to-one correspondence with the through holes, and the number of the balance weight pieces, the resistance rods, the electrode pieces and the measuring devices is set to be a plurality and is in one-to-one correspondence.
The second technical scheme adopted by the invention for solving the technical problems is as follows: a use method of the offshore oil platform pile foundation washout pit shape measuring device comprises the following steps:
and step 30, generating a scouring pit around the pile foundation, descending the sea bed surface, driving the resistance rod to move downwards by the weight part moving downwards under the action of gravity, enabling the electrode plate to be abutted against the upper end of the resistance rod, reducing the resistance value measured by the measurer and converting the resistance value into a scouring pit depth value.
In a preferred embodiment, the method further includes a step 40 of arranging a plurality of one-to-one corresponding balance weights, resistance rods and electrode plates at intervals on the reference plate, and a plurality of measuring devices are also arranged and correspond to the resistance rods and the electrode plates one-to-one, and the resistance values measured by the plurality of measuring devices are converted into the depth values of the erosion pits, so as to draw a form diagram of the erosion pits in the seabed surface covered by the reference plate.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
1. the working principle of the device is as follows:
when the surface of the sea bed around the pile foundation does not descend, the counterweight piece is arranged on the surface of the sea bed and does not move downwards, and at the moment, the resistance between the resistance rod and the electrode plate measured by the measurer always keeps the same value;
when the sea bed surface around the pile foundation descends and scouring pits appear, the counterweight moves downwards to drive the resistance rod to move downwards so that the electrode plate abuts against the upper end position of the resistance rod, and the resistance value measured by the measurer is reduced and converted into the depth value of the scouring pits;
by arranging a plurality of groups of measuring devices on the reference plate, the surface of the seabed around the pile foundation covered by the reference plate can be respectively measured, and the form change of the scour pit in the plane can be drawn. The device has the advantages of simple structure, low cost, convenient implementation and higher precision, and is suitable for large-area popularization and use.
2. The guide opening has a guide effect on the resistance rod, the guide cavity has a guide effect on the counterweight, and the electrode plate is fixedly connected to the top end of the guide member, so that the electrode plate can be always in contact with the resistance rod, and the precision and the accuracy of the device are ensured.
3. The flat part of the electrode plate is fixedly connected with the reference plate, and the bending part is abutted against the periphery of the resistance rod, so that the bending part has certain elasticity, and the bending part is ensured to be tightly attached outside the resistance rod.
Drawings
Fig. 1 is an overall structure schematic diagram of a device for measuring the shape of a pile foundation erosion pit of an offshore oil platform.
Detailed Description
The invention is further described below by means of specific embodiments.
Referring to fig. 1, an offshore oil platform pile foundation washout pit form measuring device includes: reference plate 10, resistance rod 20, weight 30, electrode sheet, measurer 40.
The datum plate 10 is fixed on the surface of the sea bed around the pile foundation 1. The reference plate 10 is made of a high-strength plastic plate with high rigidity, the width and height of the reference plate are 20 mm and 100 mm respectively, and the length of the reference plate is 5-10 m.
In this embodiment, the reference plate 10 is provided with a through hole, a guide member 11 is fixedly disposed at the through hole, the guide member 11 is provided with a guide opening and a guide cavity 12 communicated with the guide opening, and the guide cavity 12 leads to the surface of the sea bed. The guide opening has a guide effect on the resistance rod, and the guide cavity has a guide effect on the counterweight. In the present embodiment, the number of through-holes is set to be plural and uniformly distributed on the reference plate 10, and the through-holes may be opened every 0.5 m in the longitudinal direction, and the diameter of the through-holes is 30 mm. The number of the guide pieces 11 is set to be a plurality and corresponds to the through holes one by one, the outer diameter of the guide pieces 11 can be set to be 30 mm, the thickness of the guide pieces 11 can be 5 mm, and the guide pieces 11 can also be made of plastic and are connected to the through holes through gluing. The bottom end of the guiding member 11 can extend out of the reference plate and lean against the surface of the sea bed to guide and limit the counterweight member.
The bottom end of the resistance rod 20 passes through the reference plate 10. In this embodiment, the resistor rod 20 extends into the guide chamber 12 from the guide opening. The resistance wire 21 is wound around the resistance rod 20, and the resistance wire 21 at the top end is connected to the measuring device 40 through a lead. In this embodiment, the number of the resistance rods 20 is set to be plural and one-to-one correspondence with the guide 11.
The electrode sheet is fixed on the top of the guiding member 11. In the present exemplary embodiment, the electrode plate is connected to the outside of the resistance wire 21 and is connected to the measuring device 40 via the line 22. The electrode plate is made of copper sheets and annularly sleeved outside the resistance rod 20, and the thickness of the electrode plate is 1 mm, and the length and the width of the electrode plate are 20 mm and 5 mm. In this embodiment, the number of the electrode plates is set to be a plurality and corresponding to the resistance rods one by one.
In this embodiment, the electrode sheet includes a flat portion 51 and a bent portion 52 connected to the flat portion 51, the flat portion 51 is fixedly connected to the distal end surface of the guide 11, and the bent portion 52 abuts on the outer periphery of the resistance wire 21. The bending part has certain elasticity, and the bending part is tightly attached to the outside of the resistance rod.
The weight member 30 is fixed on the bottom end of the resistance rod 20 and is disposed on the seabed surface below the reference plate 10, and is located in the guide cavity 12. The weight member is made of a copper block with the diameter of 30 mm and the thickness of 25 mm, and has a certain weight. The number of the weight members 30 is set to be plural and corresponds to the resistance rods 20 one by one.
In this embodiment, the number of measuring instruments 40 is also plural and is placed on the stage.
When the sea bed surface around the pile foundation descends and scouring pits appear, the weight part 30 moves downwards to drive the resistance rod 20 to move downwards so that the electrode plates are abutted to different positions of the resistance rod 20, and the resistance value measured by the measurer 40 is reduced and converted into the depth value of the scouring pits. The reduction value of the resistance rod and the descending distance of the counterweight can be measured in advance to obtain a conversion relation, and conversion is convenient.
The use method of the measuring device comprises the following steps:
and step 30, generating a scouring pit around the pile foundation, descending the sea bed surface, driving the resistance rod 20 to move downwards by the weight part 30 moving downwards under the action of gravity, enabling the electrode plate to abut against the upper end of the resistance rod 20, reducing the resistance value measured by the measurer 40 and converting the resistance value into a scouring pit depth value.
And step 40, arranging a plurality of weight members 30, resistance rods 20 and electrode plates which correspond to one another at intervals on the reference plate 10, arranging a plurality of measuring devices 40 which correspond to the resistance rods 20 and the electrode plates one to one, converting resistance values measured by the plurality of measuring devices 40 into a depth value of the scour pit, and drawing a form diagram of the scour pit in a seabed surface covered by the reference plate.
The working principle of the device is as follows:
when the surface of the sea bed around the pile foundation does not descend, the counterweight piece is arranged on the surface of the sea bed and does not move downwards, and at the moment, the resistance between the resistance rod and the electrode plate measured by the measurer always keeps the same value;
when the sea bed surface around the pile foundation descends and scouring pits appear, the counterweight moves downwards to drive the resistance rod to move downwards so that the electrode plate abuts against the upper end position of the resistance rod, and the resistance value measured by the measurer is reduced and converted into the depth value of the scouring pits;
by arranging a plurality of groups of measuring devices on the reference plate, the surface of the seabed around the pile foundation covered by the reference plate can be respectively measured, and the form change of the scour pit in the plane can be drawn. The device has the advantages of simple structure, low cost, convenient implementation and higher precision, and is suitable for large-area popularization and use.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (7)
1. The utility model provides an offshore oil platform pile foundation scour pit form measuring device which characterized in that: the method comprises the following steps: the pile foundation measuring device comprises a reference plate, a resistance rod, a balance weight, an electrode plate and a measurer, wherein the reference plate is fixed on a seabed surface around a pile foundation, the resistance rod penetrates through the reference plate, the balance weight is fixedly connected to the resistance rod and is arranged on the seabed surface below the reference plate, the electrode plate is fixedly connected to the reference plate and is abutted to the outside of the resistance rod, and the top end of the resistance rod and the electrode plate are both connected with the measurer;
when the sea bed surface around the pile foundation descends and scouring pits appear, the weight part moves downwards to drive the resistance rod to move downwards so that the electrode plates are abutted to different positions of the resistance rod, and the resistance value measured by the measurer is reduced and converted into the depth value of the scouring pits.
2. The offshore oil platform pile foundation washout pit morphology measuring device of claim 1, characterized by: the reference plate is provided with a through hole, a guide piece is fixedly arranged at the through hole, the guide piece is provided with a guide opening and a guide cavity communicated with the guide opening, the resistance rod extends into the guide cavity from the guide opening, the counterweight piece is positioned in the guide cavity, and the electrode plate is fixedly connected to the top end of the guide piece.
3. The offshore oil platform pile foundation washout pit morphology measuring device of claim 1, characterized by: the resistance wire is wound around the resistance rod, the resistance wire at the top end of the resistance rod is connected with the measurer through a lead, and the electrode plate is abutted to the outside of the resistance wire and is connected with the measurer through the lead.
4. The offshore oil platform pile foundation washout pit morphology measuring device of claim 3, characterized by: the electrode plate comprises a plane part and a bending part connected with the plane part, the plane part is fixedly connected with the reference plate, and the bending part is abutted to the periphery of the resistance rod.
5. The offshore oil platform pile foundation washout pit morphology measuring device of claim 2, characterized in that: the number of the through holes is set to be multiple and is uniformly distributed on the reference plate, the number of the guide pieces is set to be multiple and is in one-to-one correspondence with the through holes, and the number of the balance weights, the resistance rods, the electrode plates and the measuring devices is set to be multiple and is in one-to-one correspondence.
6. Use method of the offshore oil platform pile foundation washout pit morphology measuring device of any one of claims 1 to 5, characterized in that: it includes:
step 10, fixing a reference plate on a seabed surface around a pile foundation, enabling a resistance rod to penetrate through the reference plate and be fixedly connected with a counterweight, fixedly connecting an electrode plate on the reference plate, connecting the top end of the resistance rod and the electrode plate with a measurer through a lead, and placing the measurer on a platform;
step 20, no washout pit appears around the pile foundation, the sea bed surface does not descend, the counterweight remains stationary, and the resistance value measured by the measurer is not changed;
and step 30, generating a scouring pit around the pile foundation, descending the sea bed surface, driving the resistance rod to move downwards by the weight part moving downwards under the action of gravity, enabling the electrode plate to be abutted against the upper end of the resistance rod, reducing the resistance value measured by the measurer and converting the resistance value into a scouring pit depth value.
7. The use method of the offshore oil platform pile foundation washout pit shape measuring device according to claim 6, characterized in that: and step 40, arranging a plurality of weight members, resistance rods and electrode plates which correspond to each other one by one at intervals between the reference plates, arranging a plurality of measuring devices which correspond to the resistance rods and the electrode plates one by one, converting resistance values measured by the plurality of measuring devices into a depth value of the scour pit, and drawing a form diagram of the scour pit in the seabed surface covered by the reference plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048615.XA CN108253881B (en) | 2018-01-18 | 2018-01-18 | Offshore oil platform pile foundation washout pit form measuring device and using method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810048615.XA CN108253881B (en) | 2018-01-18 | 2018-01-18 | Offshore oil platform pile foundation washout pit form measuring device and using method |
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| CN108253881A CN108253881A (en) | 2018-07-06 |
| CN108253881B true CN108253881B (en) | 2020-05-05 |
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| CN201810048615.XA Expired - Fee Related CN108253881B (en) | 2018-01-18 | 2018-01-18 | Offshore oil platform pile foundation washout pit form measuring device and using method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021081748A1 (en) * | 2019-10-29 | 2021-05-06 | 浙江大学 | Self-driving sensor capable of being used for testing in real time lateral resistance and end resistance of marine pipe pile, and testing device |
| CN113123376B (en) * | 2021-04-23 | 2022-01-28 | 中国海洋大学 | Method for detecting, managing and reinforcing scouring form of pile foundation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1474751A (en) * | 1975-07-23 | 1977-05-25 | Ferranti Ltd | Angle measurement |
| US4054862A (en) * | 1975-10-28 | 1977-10-18 | Raytheon Company | Ranging system with resolution of correlator ambiguities |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4749858A (en) * | 1986-08-27 | 1988-06-07 | Troxler Electronic Laboratories, Inc. | Nuclear measuring gauge with automatic detection of source depth |
| CN101464481A (en) * | 2008-12-31 | 2009-06-24 | 中国海洋大学 | Resistivity monitoring method and apparatus for sea floor erosion/deposition dynamic process |
| CN101799295B (en) * | 2010-03-11 | 2012-03-28 | 清华大学 | Electronic bathymeter |
| KR101489903B1 (en) * | 2014-07-03 | 2015-02-06 | (주)지오시스템리서치 | Seabed change measurement device and analysis system for seabed topography using the same |
| CN105040747B (en) * | 2015-04-21 | 2017-06-13 | 浙江大学 | A kind of real-time monitoring device and method for pile works local scour experiment |
| CN106908045B (en) * | 2017-02-21 | 2018-07-10 | 青岛海洋地质研究所 | It is a kind of to deform long-term observation device from brill cable-free type seabed |
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2018
- 2018-01-18 CN CN201810048615.XA patent/CN108253881B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1474751A (en) * | 1975-07-23 | 1977-05-25 | Ferranti Ltd | Angle measurement |
| US4054862A (en) * | 1975-10-28 | 1977-10-18 | Raytheon Company | Ranging system with resolution of correlator ambiguities |
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