CN112726687A - Small-size test device of wind-powered electricity generation grout material grout connectivity - Google Patents
Small-size test device of wind-powered electricity generation grout material grout connectivity Download PDFInfo
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- CN112726687A CN112726687A CN202011637112.XA CN202011637112A CN112726687A CN 112726687 A CN112726687 A CN 112726687A CN 202011637112 A CN202011637112 A CN 202011637112A CN 112726687 A CN112726687 A CN 112726687A
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- 239000000463 material Substances 0.000 title claims abstract description 64
- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 239000011440 grout Substances 0.000 title claims description 9
- 230000005611 electricity Effects 0.000 title claims description 3
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 239000011888 foil Substances 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000012669 compression test Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Wind Motors (AREA)
Abstract
The invention relates to a small-sized test device for grouting connection performance of wind power grouting material, which comprises an inner cylinder and an outer cylinder, wherein the outer cylinder is sleeved outside the inner cylinder, the inner diameter of the outer cylinder is not more than 120mm, and the difference between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder is 40-80 mm; the outer barrel inner side wall and the inner barrel outer side wall are respectively provided with a plurality of shear keys, grouting materials are poured between the inner barrel and the outer barrel, the outer barrel outer side wall is provided with a plurality of strain gauges, and the top of the inner barrel is provided with a displacement meter. The axial compression test is carried out through the testing machine, the ultimate load of the grouting connecting section can be detected, the outer side wall of the outer barrel is provided with the plurality of strain gauges, the top of the inner barrel is provided with the displacement gauge, and the axial load-displacement curve and the axial load-strain curve of the grouting connecting section can be measured through the strain gauges and the displacement gauge, so that the performance of different grouting materials for grouting connection can be detected, and the grouting materials are preferably selected.
Description
Technical Field
The invention relates to the technical field of offshore wind turbine foundation installation, in particular to a small-sized test device for the grouting connection performance of a wind power grouting material.
Background
With the increasing energy crisis and environmental problems, offshore wind power generation with rich wind energy resources is becoming the key point of research and development of people.
The main means for connecting the wind power foundation and the upper structure is grouting connection. At present, most offshore wind power foundation connection forms are single-pile type, researchers at home and abroad develop a great deal of experimental research and theoretical analysis on the static mechanism of a single-pile connection section, and a grouting connection section bearing capacity formula and various analysis examples are provided through prototype tests, large-size model tests and a great deal of finite element computer analysis.
Because the fan foundation grouting connecting section is connected through annular tubular cavity grouting, the stress form of the grouting material at the connecting section is more complex, and the difference between the stress form and the simple prism uniaxial compression performance is large. The slurry failure mode of the grouting connecting section under the axial load is basically the bonding sliding failure with the steel pipe and the inclined pressure failure formed between the pair of shear keys.
Most of the existing experimental researches are structural tests, and a test device for representing the connection performance of the grouting material, in particular to a small-size test device for reflecting the strength of the grouting material and the bonding performance of the grouting material and a connecting steel pipe is not available.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the small-sized test device for the grouting connection performance of the wind power grouting material can detect the advantages and disadvantages of different grouting materials for grouting connection of the wind power foundation and reasonably reflect the connection performance of the grouting material of the connection section of the real wind power foundation grouting.
In order to achieve the purpose, the invention adopts the following technical scheme:
a small-sized test device for the grouting connection performance of wind power grouting material comprises an inner cylinder and an outer cylinder, wherein the outer cylinder is sleeved outside the inner cylinder, the inner diameter of the outer cylinder is not more than 120mm, and the difference between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder is 40-80 mm; the outer barrel is sleeved outside the inner barrel, and a plurality of shear keys are respectively arranged on the inner side wall of the outer barrel and the outer side wall of the inner barrel; pouring grouting material between the inner cylinder and the outer cylinder, wherein the outer side wall of the outer cylinder is provided with a plurality of strain gauges, and the top of the inner cylinder is provided with a displacement meter.
Further, the outer barrel lower end is provided with a sealing gasket, the outer side wall of the sealing gasket is connected to the inner side wall of the outer barrel in a sealing mode, the upper end of the sealing gasket is provided with a bulge, the outer side wall of the bulge is connected to the inner side wall of the inner barrel in a sealing mode, and the lower end of the inner barrel is connected to.
Furthermore, the section of the shear key is rectangular, triangular or semicircular, and the height of the shear key does not exceed 1/4 of the thickness of the grouting material.
Furthermore, the shear keys comprise outer cylinder shear keys and inner cylinder shear keys, a plurality of outer cylinder shear key matrixes are arranged on the inner side wall of the outer cylinder, a plurality of inner cylinder shear key matrixes are arranged on the outer side wall of the inner cylinder, and the plurality of outer cylinder shear keys and the plurality of inner cylinder shear keys are arranged at intervals.
Further, the foil gage includes the hoop foil gage, and a plurality of hoop foil gages along urceolus axial interval arrangement in the urceolus lateral wall.
Further, the foil gage still includes vertical foil gage, a plurality of vertical foil gages and a plurality of hoop foil gage one-to-one, and a plurality of hoop foil gages one side are located respectively to a plurality of vertical foil gages, and a plurality of vertical foil gages are arranged in the urceolus lateral wall along urceolus axial interval.
Further, the inner cylinder and the outer cylinder are both made of high-strength steel.
Furthermore, the upper part of the inner cylinder is provided with a grout overflow hole, and the lower part of the inner cylinder is provided with a grouting hole.
Further, the height of the inner cylinder is not less than that of the outer cylinder.
Further, the grouting material poured between the inner barrel and the outer barrel forms a grouting section, and the ratio of the height of the grouting section to the inner diameter of the outer barrel is 1.2-1.8.
In summary, the present invention has the following advantages:
the limit bearing capacity of the grouting connecting section can be detected through the testing machine, the plurality of strain gauges are arranged on the outer side wall of the outer barrel, the displacement meter is arranged at the top of the inner barrel, and the axial load-displacement curve and the axial load-strain curve of the grouting connecting section can be measured through the strain gauges and the displacement meter, so that the performance of different grouting materials for grouting connection can be compared, and the connection performance of grouting materials of the real fan connecting section can be reasonably reflected.
Drawings
FIG. 1 is a front cross-sectional view of an embodiment of the present invention.
Fig. 2 is a top cross-sectional view of an embodiment of the present invention.
FIG. 3 is a front sectional view of the inner and outer barrels of the embodiment of the present invention.
FIG. 4 is a top cross-sectional view of the inner and outer barrels of an embodiment of the invention.
Fig. 5 is a schematic layout of a hoop strain gage and a longitudinal strain gage according to an embodiment of the present invention.
Description of reference numerals:
1-inner cylinder, 2-outer cylinder, 3-sealing washer, 4-outer cylinder shear key, 5-inner cylinder shear key, 6-longitudinal strain gauge and 7-circumferential strain gauge.
Detailed Description
The present invention will be described in further detail below.
As shown in fig. 1-4, a small-sized test device for the grouting connection performance of a wind power grouting material comprises an inner cylinder 1 and an outer cylinder 2, wherein the inner diameter of the outer cylinder 2 is not more than 120mm, and the difference between the inner diameter of the outer cylinder 2 and the outer diameter of the inner cylinder 1 is 40-80 mm; the outer cylinder 2 is sleeved outside the inner cylinder, and a plurality of shear keys are respectively arranged on the inner side wall of the outer cylinder 2 and the outer side wall of the inner cylinder 1; pouring grouting material between the inner barrel 1 and the outer barrel 2, wherein the outer side wall of the outer barrel 2 is provided with a plurality of strain gauges, and the top of the inner barrel 1 is provided with a displacement meter.
Due to the complexity of the stress form of the grouting material at the connecting section, the slurry failure form of the grouting connecting section under the axial load is basically the bond sliding failure with the steel pipe and the inclined pressure failure formed between the pair of shear keys, so the performance of the grouting material can not be obtained only through simple compression and shear tests.
The small-sized test device for the grouting connection performance of the wind power grouting material can detect the strength of the grouting material through a testing machine. Because the outer side wall of the outer barrel 2 is provided with the plurality of strain gauges, the top of the inner barrel 1 is provided with the displacement meter, and the axial load-displacement curve and the load-strain curve of the grouting connecting section can be measured through the strain gauges and the displacement meter, the bonding performance of the grouting material and the connecting steel pipe can be detected, and the connection performance of the grouting material of the fan connecting section can be reasonably reflected.
In the embodiment, the inner cylinder 1 is horizontally fixed on the central axis of the outer cylinder 2, the gap between the inner cylinder 1 and the outer cylinder 2 is connected by grouting material, and the grouting section formed by the grouting material is used for simulating the grouting connection section of the offshore wind power foundation so as to detect the quality of the grouting connection performance of the grouting material.
2 lower extremes of urceolus are equipped with seal ring 3, and 3 lateral walls sealing connection of seal ring are in 2 inside walls of urceolus, and 3 upper ends of seal ring are equipped with the arch, and protruding lateral wall sealing connection is in 1 inside wall of inner tube, and 1 lower extreme sealing connection of inner tube is in 3 upper ends of seal ring.
The sealing washer 3 is made of soft material, the diameter of the lower part of the sealing washer is matched with the inner diameter of the outer cylinder 2, and the diameter of the upper part of the sealing washer is matched with the inner diameter of the inner cylinder 1, and the sealing washer is used for sealing and fixing.
The cross section of the shear key is rectangular, triangular or semicircular, and the height of the shear key does not exceed 1/4 of the thickness of the grouting material.
In the embodiment, the pitch of the shear keys is 40mm, and the size of the shear key is 5mm × 5 mm. The shear keys are uniformly arranged on the inner barrel 1 and the outer barrel 2 through welding.
The shear keys comprise outer cylinder shear keys 4 and inner cylinder shear keys 5, the outer cylinder shear keys 4 are arranged on the inner side wall of the outer cylinder 2 in a matrix mode, the inner cylinder shear keys 5 are arranged on the outer side wall of the inner cylinder 1 in a matrix mode, the outer cylinder shear keys 4 and the inner cylinder shear keys 5 are arranged at intervals, and the strength of a grouting section is enhanced.
As shown in fig. 5, the strain gauge includes a circumferential strain gauge 7, and a plurality of circumferential strain gauges 7 are arranged on the outer side wall of the outer cylinder 2 at intervals in the axial direction of the outer cylinder 2.
The foil gage still includes vertical foil gage 6, a plurality of vertical foil gages 6 and a plurality of hoop foil gage 7 one-to-one, and a plurality of hoop foil gages 7 one side are located respectively to a plurality of vertical foil gages 6, and a plurality of vertical foil gages 6 are arranged in 2 lateral walls of urceolus along 2 axial intervals of urceolus.
By arranging the longitudinal strain gauge 6 and the annular strain gauge 7 on the outer cylinder 2, the load-annular strain curve and the load-longitudinal strain curve of the grouting connecting section can be measured, so that the bonding performance of the grouting material and the connecting steel pipe can be detected.
The inner cylinder 1 and the outer cylinder 2 are both made of high-strength steel.
The upper part of the inner cylinder 1 is provided with a grout overflow hole, and the lower part of the inner cylinder is provided with a grouting hole, so that underwater grouting can be simulated.
The height of the inner cylinder 1 is not less than that of the outer cylinder 2, so that grouting connection performance test detection is convenient.
The grouting material poured between the inner barrel 1 and the outer barrel 2 forms a grouting section, and the ratio of the height of the grouting section to the inner diameter of the outer barrel 2 is 1.2-1.8.
In the embodiment, the inner diameter of the outer cylinder 2 is 98mm, and the wall thickness is 5 mm; the inner diameter of the inner cylinder 1 is 40mm, and the wall thickness is 4 mm; the thickness of the grouting layer is 25mm, and the length of the grouting section is 140 mm. The thickness of the bottom plate of the outer cylinder 2 is 10 mm; the inner cylinder 1 extends out of the outer cylinder 2 by 50 mm.
The steel materials used by the shear key, the outer cylinder and the inner cylinder 1 are Q235 steel. The grouting material is ultrahigh-performance grouting material with the code of GJL-1, the actual compression strength of 28 days is not less than 120MPa, and the initial fluidity is not less than 300 mm.
The installation and pouring method of the wind power grouting material connecting section in the embodiment comprises the following steps:
1) a circumferential strain gage 7 and a longitudinal strain gage 6 are stuck on the outer side wall of the outer cylinder 2;
2) leveling an operation table, namely placing a level meter on the operation table to ensure that the surface of the operation table is level;
3) placing the outer cylinder 2 on an operation table, and placing the inner cylinder 1 in the middle of the outer cylinder 2 to ensure that the inner cylinder 1 is vertical;
4) slowly pouring the prepared grouting material into a gap between the inner barrel 1 and the outer barrel 2 until the grouting material is flush with the upper edge of the outer barrel 2;
5) standard curing for 28 days;
6) and taking out the well-maintained grouting connecting section, placing the grouting connecting section on a testing machine to start testing, and measuring a load-displacement curve and a load-strain curve of the test piece.
The test index measurement of the test piece mainly comprises an axial load-displacement curve and a load-strain curve of the grouting connecting section, wherein the strain comprises circumferential strain and vertical strain of the grouting connecting section.
The bearing capacity and the stability of the small-sized test device for the grouting connection performance of the wind power grouting material meet the requirements, and the test piece has good ductility. It has the following advantages:
(1) because the actual size of the foundation of the offshore wind turbine is large, the prototype detection test needs to consume a large amount of materials and manpower, and the embodiment of the invention is to reduce the detection test device and the size of the model is small, so the consumed materials and the consumed manpower are few.
(2) The embodiment of the invention provides a small performance detection device which is used for detecting the strength of a grouting material and the bonding performance of the grouting material and a connecting steel pipe and reasonably reflecting the connection performance of the grouting material of a real fan connecting section.
(3) Most of offshore wind power foundation grouting environments are underwater grouting, conditions are severe, underwater grouting can be simulated, and the performance of grouting materials in actual grouting environments can be further detected.
(4) Besides detecting the connection performance of the grouting material used for the grouting connection section, the embodiment of the invention can simulate the long-term load and the cyclic load of the offshore wind power foundation, and detect the durability of the grouting material used for the grouting connection section.
According to the small-sized test device for the grouting connection performance of the wind power grouting material, after pouring forming and maintenance, a grouting connection section axial center compression test, a bending test, a drawing test, an anti-torsion test and the like can be performed, the real stress characteristics of the offshore wind power grouting connection section are simulated, the construction is convenient, the device is suitable for screening out the high-performance grouting material suitable for the offshore wind power grouting connection section, the batch experiment is suitable, the technical and economic advantages are obvious, and the device is suitable for batch experiments.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a wind-powered electricity generation grout material grout connectivity small-size test device which characterized in that: the inner cylinder and the outer cylinder are included, the inner diameter of the outer cylinder is not more than 120mm, and the difference between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder is 40-80 mm; the outer barrel is sleeved outside the inner barrel, and a plurality of shear keys are respectively arranged on the inner side wall of the outer barrel and the outer side wall of the inner barrel; pouring grouting material between the inner cylinder and the outer cylinder, wherein the outer side wall of the outer cylinder is provided with a plurality of strain gauges, and the top of the inner cylinder is provided with a displacement meter.
2. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 1 is characterized in that: the outer barrel lower end is provided with a sealing washer, the outer side wall of the sealing washer is connected to the inner side wall of the outer barrel in a sealing mode, the upper end of the sealing washer is provided with a bulge, the outer side wall of the bulge is connected to the inner side wall of the inner barrel in a sealing mode, and the lower end of the inner barrel is connected.
3. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 1 is characterized in that: the cross section of the shear key is rectangular, triangular or semicircular, and the height of the shear key does not exceed 1/4 of the thickness of the grouting material.
4. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 1 is characterized in that: the shear keys comprise outer cylinder shear keys and inner cylinder shear keys, a plurality of outer cylinder shear keys are arranged on the inner side wall of the outer cylinder in a matrix manner, a plurality of inner cylinder shear keys are arranged on the outer side wall of the inner cylinder in a matrix manner, and the plurality of outer cylinder shear keys and the plurality of inner cylinder shear keys are arranged at intervals.
5. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 1 is characterized in that: the foil gage includes the hoop foil gage, and a plurality of hoop foil gages are arranged in the urceolus lateral wall along urceolus axial interval.
6. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 5, characterized in that: the strain gauge further comprises a longitudinal strain gauge, the longitudinal strain gauges correspond to the annular strain gauges one to one, the longitudinal strain gauges are respectively arranged on one sides of the annular strain gauges, and the longitudinal strain gauges are arranged on the outer side wall of the outer barrel at intervals along the axial direction of the outer barrel.
7. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 1 is characterized in that: the inner cylinder and the outer cylinder are both made of high-strength steel.
8. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 1 is characterized in that: the upper part of the inner cylinder is provided with a grout overflow hole, and the lower part of the inner cylinder is provided with a grouting hole.
9. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 1 is characterized in that: the height of the inner cylinder is not less than that of the outer cylinder.
10. The small-sized test device for the grouting connection performance of the wind power grouting material according to claim 1 is characterized in that: and the grouting material poured between the inner cylinder and the outer cylinder forms a grouting section, and the ratio of the height of the grouting section to the inner diameter of the outer cylinder is 1.2-1.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011637112.XA CN112726687A (en) | 2020-12-31 | 2020-12-31 | Small-size test device of wind-powered electricity generation grout material grout connectivity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011637112.XA CN112726687A (en) | 2020-12-31 | 2020-12-31 | Small-size test device of wind-powered electricity generation grout material grout connectivity |
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| CN112726687A true CN112726687A (en) | 2021-04-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203594045U (en) * | 2013-10-16 | 2014-05-14 | 国电联合动力技术有限公司 | Offshore wind turbine grouting pile foundation and offshore wind turbine using the same |
| CN104493971A (en) * | 2014-12-12 | 2015-04-08 | 武汉工程大学 | Artificial rock core casting mold with supporting mechanism |
| CN105547844A (en) * | 2015-12-13 | 2016-05-04 | 华北理工大学 | Filling body-pillar system mechanical effect mechanism test method |
| CN111912969A (en) * | 2020-08-28 | 2020-11-10 | 中交天津港湾工程研究院有限公司 | Underwater grouting quality detection test device and using method thereof |
| CN214832948U (en) * | 2020-12-31 | 2021-11-23 | 华南理工大学 | Small-size test device of wind-powered electricity generation grout material grout connectivity |
-
2020
- 2020-12-31 CN CN202011637112.XA patent/CN112726687A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203594045U (en) * | 2013-10-16 | 2014-05-14 | 国电联合动力技术有限公司 | Offshore wind turbine grouting pile foundation and offshore wind turbine using the same |
| CN104493971A (en) * | 2014-12-12 | 2015-04-08 | 武汉工程大学 | Artificial rock core casting mold with supporting mechanism |
| CN105547844A (en) * | 2015-12-13 | 2016-05-04 | 华北理工大学 | Filling body-pillar system mechanical effect mechanism test method |
| CN111912969A (en) * | 2020-08-28 | 2020-11-10 | 中交天津港湾工程研究院有限公司 | Underwater grouting quality detection test device and using method thereof |
| CN214832948U (en) * | 2020-12-31 | 2021-11-23 | 华南理工大学 | Small-size test device of wind-powered electricity generation grout material grout connectivity |
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