CN214832948U - 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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- CN214832948U CN214832948U CN202023322403.8U CN202023322403U CN214832948U CN 214832948 U CN214832948 U CN 214832948U CN 202023322403 U CN202023322403 U CN 202023322403U CN 214832948 U CN214832948 U CN 214832948U
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Abstract
The utility model relates to a small-sized test device for grouting connection performance of wind power grouting material, which comprises an inner barrel and an outer barrel, wherein the outer barrel is sleeved outside the inner barrel, the inner diameter of the outer barrel is not more than 120mm, and the difference between the inner diameter of the outer barrel and the outer diameter of the inner barrel 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 utility model relates to an offshore wind turbine foundation installation technical field especially relates to a wind-powered electricity generation grout material grout connection performance small-size test device.
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.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the prior art, the utility model aims at: 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 above purpose, the utility model 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 the upper end of the sealing gasket in a sealing mode.
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 general, the utility model has the advantages as follows:
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 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 tube and the outer tube according to the embodiment of the present invention.
Fig. 4 is a top sectional view of the inner tube and the outer tube according to the embodiment of the present invention.
Fig. 5 is a schematic layout diagram of the hoop strain gauge and the longitudinal strain gauge 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 utility model discloses a wind-powered electricity generation grout material grout connectivity small-size test device can detect grouting material intensity through the 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.
Bearing capacity and stability of small-sized test device for grouting connection performance of wind power grouting material in embodiment
Meets the requirements, and the test piece has better ductility. It has the following advantages:
(1) because offshore wind turbine basis actual dimension is very big, a large amount of materials and manpower need be consumed in prototype testing, the embodiment of the utility model provides a for reducing the testing device, the model size is little, and consequently the material and the manpower of consumption are few.
(2) Because grouting material is at the complexity of linkage segment atress form, grout linkage segment slurry under the axial load destroy the form for basically sliding destruction and form the ramp pressure between the shear force key in pairs for cohering with the steel pipe and destroy, consequently grouting material's performance can not only be through simple resistance to compression, shear test and derive, the embodiment of the utility model provides a small-size performance detection device for detect grouting material intensity, grouting material and the steel pipe cohesiveness ability of being connected, can comparatively rationally react true fan linkage segment grouting material's connection performance.
(3) Most marine wind power basis grout environment is grout under water, and the condition is comparatively harsh, the embodiment of the utility model provides a can simulate grout under water, further detect the performance of grout material under the actual grout environment.
(4) Except that detecting the connectivity that the grout material is used for the grout linkage segment, the embodiment of the utility model provides a can simulate long-term load and the cyclic load that marine wind power basis received, detect the durability that the grout material is used for this grout linkage segment.
The utility model discloses a wind-powered electricity generation grout performance small-size test device can carry out grout joint section axle center compression test, bending test, drawing test, antitorque test etc. after pouring the shaping and the maintenance, has simulated the atress characteristics of real marine wind-powered electricity generation grout joint section, and it is convenient to be under construction, is applicable to selecting the high performance grout material that is suitable for marine wind-powered electricity generation grout joint section, is fit for carrying out the experiment in batches, has the technological economic advantage that is showing, is fit for carrying out the experiment in batches.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are 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 equivalent replacement modes, and all are 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 to the upper end of the sealing washer in a sealing mode.
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.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112726687A (en) * | 2020-12-31 | 2021-04-30 | 华南理工大学 | Small-size test device of wind-powered electricity generation grout material grout connectivity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112726687A (en) * | 2020-12-31 | 2021-04-30 | 华南理工大学 | Small-size test device of wind-powered electricity generation grout material grout connectivity |
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