CN106968893A - The anti-strong wind device of wind power tower - Google Patents
The anti-strong wind device of wind power tower Download PDFInfo
- Publication number
- CN106968893A CN106968893A CN201710160555.6A CN201710160555A CN106968893A CN 106968893 A CN106968893 A CN 106968893A CN 201710160555 A CN201710160555 A CN 201710160555A CN 106968893 A CN106968893 A CN 106968893A
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- drag
- line
- main body
- wind
- pylon
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- 238000007665 sagging Methods 0.000 claims abstract description 7
- 230000008602 contraction Effects 0.000 claims abstract description 6
- 239000011888 foil Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 230000002459 sustained effect Effects 0.000 claims description 2
- 239000004567 concrete Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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- Wind Motors (AREA)
Abstract
The present invention relates to the anti-strong wind device of wind power tower, wind-driven generator including pylon main body and installed in the pylon main body top, the pylon main body is provided with many drag-lines, one end of wherein every drag-line is fixed on the top of the pylon main body, the other end of every drag-line is connected with toothed-wheel gear, the toothed-wheel gear is connected with control system, the contraction or expansion of the toothed-wheel gear control drag-line are controlled by the control system, when the drag-line shrinks, the drag-line is sagging and pack up along the pylon main body, during the drag-line expansion, the blade of the drag-line through the wind-driven generator scans scope, and the bottom of the pylon main body is provided with multiple strain gauge means corresponding with the drag-line quantity.The present invention makes high wind be transferred in drag-line the overwhelming majority in the horizontal force of wind power tower, considerably reduces the stress level and collapse probability of pylon.
Description
Technical field
The invention belongs to the technical field of wind power tower, the anti-strong wind device of wind power tower is referred in particular to.
Background technology
Wind power generation stepped to belong to tower mast structure, with the development of wind generating technology, wind blade is increasing, blower fan tower
The height of frame is also increased, and the cost of corresponding Wind turbines is also increasing.Therefore, in order to reduce large-scale wind driven generator year
Equal cost of electricity-generating, the projected life of wind-power electricity generation starts to increase substantially.In the military service of wind-driven generator, wind load is corresponding
Wind speed can be divided into normal wind speed and extreme wind speeds.In normal wind speed, rotated by Wind power propelling fan blade and realize what is generated electricity；
Generally, wind power tower corresponding wind speed within most times is normal wind speed, or less than normal wind speed；And in pole
Hold under wind speed, damaged to protect electrical equipment not occur driving, fan blade will stop operating, although extreme wind speeds
The probability very little of generation, the duration is very short, but the load and structure design of the blower fan pylon are necessarily required to by extreme wind speeds
Calculate, thereby may be ensured that the safety of wind power tower.
The existing safety in order to ensure wind power tower under extreme wind speeds, such as Chinese invention patent（CN105179183A）It is open
A kind of prestressed concrete wind power tower system and its construction method, the upper end connection wind-driven generator of its pylon main body, institute
State pylon main body to be socketed to form by the concrete tower and superposed steel tower segment positioned at bottom, the pylon main body is by advance should
Power drag-line drawknot is fixed；The prestressed cable has the vertical prestressing beam being arranged on inside the concrete tower of bottom and is arranged on
Oblique prestressed cable outside the concrete tower of bottom, the upper end of vertical prestressing beam and oblique prestressed cable anchor with
On the steel tower segment flange in the bottom of top, the lower end of oblique prestressed cable is fixedly connected with anti_floating foundation, under vertical prestressing beam
End and the base anchor connection of concrete tower.In above-mentioned wind power tower, although pylon main body can be played by drag-line
Supporting role, reduces the stress performance of pylon structure to a certain extent, but in order to avoid blade bumps against with the drag-line,
The position that the vertical prestressing beam and oblique prestressed cable are fixed in pylon main body is had to less than wind-force hair
The position of motor, i.e. drag-line hanging point must be very low, therefore when high wind is to attack, support effect of the described drag-line to pylon main body
Limited, when causing to run into extreme wind still there is the risk collapsed in the pylon main body.
The content of the invention
Therefore, the technical problems to be solved by the invention are to overcome drag-line described in prior art in the extension of pylon main body
Point position is too low the problem of cause poor to the support effect of pylon can increase substantially drag-line so as to providing one kind pylon is supported
The anti-strong wind device of the wind power tower of effect.
In order to solve the above technical problems, the present invention a kind of wind power tower anti-strong wind device, including pylon main body and
Wind-driven generator installed in the pylon main body top, many drag-lines are provided with along the pylon main body, wherein every drag-line
One end be fixed on the top of the pylon main body, the other end of every drag-line is connected with toothed-wheel gear, the gear connection
Dynamic device is connected with control system, by the contraction of the control system control toothed-wheel gear drive drag-line or
Person deploys, when the drag-line shrinks, and the drag-line is sagging and pack up along the pylon main body, during the drag-line expansion, the drawing
The blade of rope through the wind-driven generator scans scope, and the bottom of the pylon main body is provided with and the drag-line quantity pair
The multiple strain gauge means answered.
In one embodiment of the invention, one end of many drag-lines is fixed on the same of the pylon main body top
In height.
In one embodiment of the invention, the quantity of the drag-line is at least three, and is evenly distributed on the pylon
Around main body.
In one embodiment of the invention, the drag-line shrink when including under the top freedom of the pylon main body
The second segment for hanging down to the first paragraph on ground and being connected with the toothed-wheel gear.
In one embodiment of the invention, the tie point of the drag-line first paragraph and second segment is fixed on earth anchor, and
The earth anchor is located at the root of the pylon main body.
In one embodiment of the invention, the pylon main body is provided with multiple for tying up the drawing along short transverse
The storage ring of rope.
In one embodiment of the invention, the strain gauge means are located at drag-line axis and the tower after deploying
In the plane and the intersection of the pylon body surfaces that frame body axis is determined.
In one embodiment of the invention, the strain gauge means are foil gauges.
In one embodiment of the invention, the toothed-wheel gear includes hoist engine.
The above-mentioned technical proposal of the present invention has advantages below compared with prior art：
The anti-strong wind device of wind power tower of the present invention, under normal wind regime, drag-line does not influence wind to pack up hang
Machine blade is freely rotated；When high wind is to attack, the blade of wind-driven generator stops operating, and the rotation of toothed-wheel gear drives
The drag-line on wind power tower top is started to spread out, and the strain gauge means moment monitors the strain of the corresponding pylon monitoring point of each drag-line
Power, to adjust exerting oneself for the strain gauge means, it is ensured that the strain difference of each monitoring point is in the range of permissible value, so that just
It can ensure when drag-line deploys, wind power tower is kept vertical state, make high wind in the horizontal force of wind power tower
The overwhelming majority is transferred in drag-line, considerably reduces the stress level and collapse probability of pylon.
Brief description of the drawings
In order that present disclosure is more likely to be clearly understood, specific embodiment and combination below according to the present invention
Accompanying drawing, the present invention is further detailed explanation, wherein
Schematic diagram when Fig. 1 is the drag-line contraction of wind power tower of the present invention；
Schematic diagram when Fig. 2 is the drag-line expansion of wind power tower of the present invention；
Top view when Fig. 3 is the drag-line expansion of wind power tower of the present invention.
Embodiment
It refer to shown in Fig. 1 and Fig. 2 and Fig. 3, the present embodiment provides a kind of anti-strong wind device of wind power tower, including tower
Frame body 10 and the wind-driven generator 20 installed in the top of pylon main body 10, many are provided with along the pylon main body 10
Drag-line 30, wherein one end of every drag-line 30 is fixed on the top of the pylon main body 10, the other end and tooth of every drag-line 30
Take turns linkage 40 to be connected, the toothed-wheel gear 40 is connected with control system, the tooth is controlled by the control system
Wheel linkage 40 drives the contraction or expansion of the drag-line 30, when the drag-line 30 shrinks, and the drag-line 30 is along the tower
Frame body 10 is sagging and packs up, when the drag-line 30 deploys, and the blade of the drag-line 30 through the wind-driven generator 20 is scanned
Scope, and the bottom of the pylon main body 10 is provided with multiple strain gauge means 50 corresponding with the quantity of drag-line 30.
Above-mentioned is core technology scheme of the present invention, the anti-strong wind device of wind power tower of the present invention, including tower
Frame body 10 and the wind-driven generator 20 installed in the top of pylon main body 10, many are provided with along the pylon main body 10
Drag-line 30, wherein one end of every drag-line 30 is fixed on the top of the pylon main body 10, so as to be conducive to the pylon master
The support of body 10；The other end of every drag-line 30 is connected with toothed-wheel gear 40, and the toothed-wheel gear 40 is with control
System is connected, and controls the toothed-wheel gear 40 to drive the contraction or expansion of the drag-line 30 by the control system, has
Body, the control system controls the toothed-wheel gear 40 to drive the drag-line 30 to shrink, institute in wind speed under normal circumstances
When stating drag-line 30 and shrinking, the drag-line 30 is sagging and pack up along the pylon main body 10, it is to avoid the leaf of the wind-driven generator 20
Piece collides with the drag-line 30, from without influenceing the normal power generation of the wind-driven generator 20；If high wind is attacked, the wind
The blade of power generator 20 stops operating, and the control system controls the toothed-wheel gear 40 to rotate and ties up to institute so as to drive
The drag-line 30 for stating the top of pylon main body 10 deploys, when the drag-line 30 deploys, and the drag-line 30 passes through the wind-driven generator 20
Blade scan scope, so as to be conducive to the support to the pylon main body 10；The bottom of the pylon main body 10 be provided with
The corresponding multiple strain gauge means 50 of the quantity of drag-line 30, each correspondence of drag-line 30 is monitored by the strain gauge means 50
The pylon main body 10 on monitoring point adaptability to changes, and calculate the drag-line 30 accordingly the wind power tower generation toppled
Torque, it is ensured that the drag-line 30 each drag-line horizontal resultant during expansion is zero, so as to avoid occurring to the pylon main body
10 tilting moments produced；Furthermore, after the drag-line 30 is fully deployed, high wind is to the exhausted big portion in the horizontal force of wind power tower
Divide and be transferred in drag-line, so as to considerably reduce the stress level and collapse probability of the wind power tower；In addition, of the invention
It is easy for installation, low cost, therefore can be used for reinforcing existing blower fan apparatus.
It is described in order to ensure to share the wind load that the wind power tower is born using the drag-line 30 under high wind state
One end of many drag-lines 30 is fixed on the sustained height on the top of pylon main body 10, so as to balance the wind-power electricity generation
The moment of flexure that 20 pairs of the unit pylon main body 10 is produced, reduces the overturning moment load that the bottom of pylon main body 10 is born.
The quantity of the drag-line 30 is at least three, and is evenly distributed on around the pylon main body 10, so that favorably
Disperse away in the huge lateral load load for producing 20 pairs of the wind-driven generator pylon main body 10, reduce the tower
The overturning moment load that the bottom of frame body 10 is born；When the drag-line 30 shrinks, as shown in figure 1, the drag-line 30 is included by institute
The second segment that the top of pylon main body 10 freely hangs down to the first paragraph on ground and is connected with the toothed-wheel gear 40 is stated,
And the tie point of the first paragraph of drag-line 30 and second segment is fixed on earth anchor, and the earth anchor is located at the pylon main body 10
Root, so as to ensure in the case of normal wind speed, it is to avoid the normal power generation of the influence wind-driven generator 20；In addition, the tower
Frame body 10 is provided with multiple storage rings for being used to tie up the drag-line 30 along short transverse, when the drag-line 30 is in sagging shape
During state, the drag-line 30 is contained ring and constrained, and prevents the drag-line 30 from arbitrarily waving, it is to avoid the influence wind-driven generator 20
The rotation of blade；And in the case of extreme wind speeds, as shown in Fig. 2 the drag-line 30 is in deployed condition, the drag-line 30 and institute
It is acute angle to state the angle formed between pylon main body 10, and now the blade of the wind-driven generator 20 is when the drag-line 30 deploys
Stop operating, so that the wind load that the pylon main body 10 is born can be shared using the drag-line 30.
In the present embodiment, the toothed-wheel gear 40 is hoist engine, in the case of extreme wind speeds, the hoist engine according to
Control centre is instructed, and is tightened up the drag-line 30, the drag-line 30 is shared the wind load that the pylon main body 10 is born；Institute
State after wind speed recovery normally, discharge the drag-line 30.
In order to ensure that the strain gauge means 50 measure the accuracy that the pylon main body 10 is strained, the strain measurement
Device 50 is located at the plane and the pylon main body 10 that the axis of drag-line 30 after deploying and the axis of pylon main body 10 are determined
On the intersection on surface, and as far as possible close to the root of the pylon main body 10.In addition, being surveyed according to the strain gauge means 50
The strain value of amount, can calculate the tilting moment that 30 pairs of the drag-line pylon main body 10 is produced, so as to ensure each drag-line
Tilting moment and/or horizontal force sum to pylon main body 10 is zero.Specifically, to set three in the pylon main body 10
Exemplified by root drag-line, the method for calculating the tilting moment of the drag-line 30 is： M1=（ε1-ε）EW, ε=ε 1+ ε 2+ ε 3, wherein, ε 1, ε
2nd, ε 3 is respectively the strain of the corresponding foil gauge measurement of three drag-lines, and E is the modulus of elasticity of component, and W is the pylon main body 10
Resistance moment, its numerical value can be inquired about inside the tower design handbook.Therefore measured by the strain gauge means 50
The adaptability to changes of the pylon main body 10, so that toothed-wheel gear 40 is handled described in reasonable arrangement, by adjusting the drawing
The stressing conditions of rope 30 avoid the wind power tower from being collapsed because Cable forces are uneven.
In the present embodiment, the strain gauge means 50 are foil gauges, and the foil gauge can be affixed directly to the tower
On frame body 10.
To sum up, technical scheme of the present invention has advantages below：
1. the anti-strong wind device of wind power tower of the present invention, including pylon main body and installed in the pylon main body top
Wind-driven generator, many drag-lines are provided with along the pylon main body, wherein one end of every drag-line is fixed on the pylon main body
Top, so as to be conducive to the support to the pylon main body；The other end of every drag-line is connected with toothed-wheel gear, described
Toothed-wheel gear is connected with control system, controls the toothed-wheel gear to drive the drag-line by the control system
Shrink or deploy, specifically, the toothed-wheel gear controls the drag-line to shrink, described to draw in wind speed under normal circumstances
When rope shrinks, the drag-line is sagging and pack up along the pylon main body, it is to avoid the blade of the wind-driven generator occurs with drag-line
Collision, from without influenceing the normal power generation of the wind-driven generator；If high wind is attacked, the blade of the wind-driven generator stops turning
Dynamic, the control system controls the toothed-wheel gear to rotate to drive the drag-line exhibition for tying up to the pylon main body top
Open, during the drag-line expansion, the blade of the drag-line through the wind-driven generator scans scope, so as to be conducive to the tower
The support of frame body, the bottom of the pylon main body is provided with multiple strain gauge means corresponding with the drag-line quantity, leads to
The adaptability to changes that the strain gauge means monitor monitoring point in the corresponding pylon main body of each drag-line is crossed, and is calculated accordingly described
The tilting moment that drag-line is produced to the wind power tower, it is ensured that the drag-line each drag-line horizontal resultant during expansion is zero,
So as to avoid the tilting moment for occurring to produce the pylon main body；Furthermore, after the drag-line is fully deployed, high wind is to wind-powered electricity generation
The overwhelming majority in the horizontal force of pylon is transferred in drag-line, so as to considerably reduce the stress level of the wind power tower
And collapse probability.
2. the anti-strong wind device of wind power tower of the present invention, in order to ensure that the strain gauge means measure the pylon
The accuracy of main body strain, the strain gauge means are located at the drag-line axis after deploying and the pylon main body axis is determined
Plane and the pylon body surfaces intersection on, and as far as possible close to the root of the pylon main body.Answered by described
The adaptability to changes of the pylon main body can be measured by becoming measurement apparatus, so that toothed-wheel gear is handled described in reasonable arrangement,
The wind power tower is avoided to be collapsed because Cable forces are uneven by adjusting the stressing conditions of the drag-line.
Obviously, above-described embodiment is only intended to clearly illustrate example, not to the restriction of embodiment.For
For those of ordinary skill in the art, other multi-form changes can also be made on the basis of the above description or are become
It is dynamic.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change or change thus extended out
Among moving still in the protection domain of the invention.
Claims (9)
1. a kind of anti-strong wind device of wind power tower, including pylon main body and the wind-force installed in the pylon main body top are sent out
Motor, it is characterised in that：The pylon main body is provided with many drag-lines, wherein one end of every drag-line is fixed on the pylon
The top of main body, the other end of every drag-line is connected with toothed-wheel gear, and the toothed-wheel gear is connected with control system,
The contraction or expansion of the toothed-wheel gear drive drag-line are controlled by the control system, the drag-line shrinks
When, the drag-line is sagging and pack up along the pylon main body, and during the drag-line expansion, the drag-line passes through the wind-driven generator
Blade scan scope, and the bottom of the pylon main body is provided with multiple strain measurement dresses corresponding with the drag-line quantity
Put.
2. the anti-strong wind device of wind power tower according to claim 1, it is characterised in that：One end of many drag-lines is consolidated
On the sustained height for being scheduled on the pylon main body top.
3. the anti-strong wind device of wind power tower according to claim 2, it is characterised in that：The quantity of the drag-line is at least
Three, and be evenly distributed on around the pylon main body.
4. according to the anti-strong wind device of wind power tower any one of in claim 1-3, it is characterised in that：The drag-line
Shrink when including freely hung down to by the top of the pylon main body ground first paragraph and with the toothed-wheel gear
Connected second segment.
5. the anti-strong wind device of wind power tower according to claim 4, it is characterised in that：The drag-line first paragraph and second
The tie point of section is fixed on earth anchor, and the earth anchor is located at the root of the pylon main body.
6. the anti-strong wind device of wind power tower according to claim 1, it is characterised in that：The pylon main body is along height side
Multiple it is used to tie up the storage rings of the drag-line to being provided with.
7. the anti-strong wind device of wind power tower according to claim 1, it is characterised in that：The strain gauge means are located at
In the plane and the intersection of the pylon body surfaces that drag-line axis and the pylon main body axis after deploying are determined.
8. the anti-strong wind device of the wind power tower according to claim 1 or 7, it is characterised in that：The strain gauge means
It is foil gauge.
9. the anti-strong wind device of wind power tower according to claim 1, it is characterised in that：The toothed-wheel gear includes
Hoist engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160555.6A CN106968893A (en) | 2017-03-17 | 2017-03-17 | The anti-strong wind device of wind power tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160555.6A CN106968893A (en) | 2017-03-17 | 2017-03-17 | The anti-strong wind device of wind power tower |
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| Publication Number | Publication Date |
|---|---|
| CN106968893A true CN106968893A (en) | 2017-07-21 |
Family
ID=59329032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710160555.6A Pending CN106968893A (en) | 2017-03-17 | 2017-03-17 | The anti-strong wind device of wind power tower |
Country Status (1)
| Country | Link |
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| CN (1) | CN106968893A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107905946A (en) * | 2017-10-23 | 2018-04-13 | 西北工业大学 | A kind of passive load reduction control system of Anti-Typhoon master of offshore wind farm |
| CN112576449A (en) * | 2019-09-27 | 2021-03-30 | 北京金风科创风电设备有限公司 | Stay cable type tower and wind generating set |
| WO2021056923A1 (en) * | 2019-09-27 | 2021-04-01 | 北京金风科创风电设备有限公司 | Guyed tower, wind power generator set and connecting devices |
| CN114411829A (en) * | 2022-01-25 | 2022-04-29 | 中国电建集团海南电力设计研究院有限公司 | Pile foundation and fan foundation connection detection device |
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| CN102032120A (en) * | 2010-12-27 | 2011-04-27 | 浙江大学 | Heavy wind-resistant expandable cable-tower wind driven generator |
| CN104122013A (en) * | 2014-07-15 | 2014-10-29 | 西安交通大学 | On-line monitoring method for large-scale wind power tower drum structure stress |
| US20150308139A1 (en) * | 2012-09-03 | 2015-10-29 | X-Tower Constructions Gmbh | Tower Construction Of A Wind Turbine And Method For Stabilizing A Tower Construction Of A Wind Turbine |
| CN206668474U (en) * | 2017-03-17 | 2017-11-24 | 中国电力科学研究院 | The anti-strong wind device of wind power tower |
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2017
- 2017-03-17 CN CN201710160555.6A patent/CN106968893A/en active Pending
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| CN102032120A (en) * | 2010-12-27 | 2011-04-27 | 浙江大学 | Heavy wind-resistant expandable cable-tower wind driven generator |
| US20150308139A1 (en) * | 2012-09-03 | 2015-10-29 | X-Tower Constructions Gmbh | Tower Construction Of A Wind Turbine And Method For Stabilizing A Tower Construction Of A Wind Turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107905946A (en) * | 2017-10-23 | 2018-04-13 | 西北工业大学 | A kind of passive load reduction control system of Anti-Typhoon master of offshore wind farm |
| CN112576449A (en) * | 2019-09-27 | 2021-03-30 | 北京金风科创风电设备有限公司 | Stay cable type tower and wind generating set |
| WO2021056923A1 (en) * | 2019-09-27 | 2021-04-01 | 北京金风科创风电设备有限公司 | Guyed tower, wind power generator set and connecting devices |
| CN114411829A (en) * | 2022-01-25 | 2022-04-29 | 中国电建集团海南电力设计研究院有限公司 | Pile foundation and fan foundation connection detection device |
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