CN113653109A - Device and method for simulating horizontal dynamic load of pile top in field use - Google Patents
Device and method for simulating horizontal dynamic load of pile top in field use Download PDFInfo
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Abstract
The invention relates to the field of field test of horizontal stress characteristics of a single-pile foundation, in particular to a device and a method for simulating horizontal dynamic load of a pile top in field use. The device comprises a fixed connection system, an outer supporting system, a disc loading system, a transmission system, a power system and a loading feedback detection system, wherein the fixed connection system is positioned at the bottom of the whole device, the loading feedback detection system is arranged between the outer supporting system and the fixed connection system, the disc loading system and the transmission system are arranged in the outer supporting system, the power system is fixed above the outer supporting system, the power system transmits power to the disc loading system through the transmission system, and a protection system is arranged outside the whole device. The device is convenient to disassemble, assemble and move, has variable amplitude and variable frequency, realizes the horizontal dynamic load of the pile top on site simulation, has enough large horizontal dynamic load and has larger adjusting range.
Description
Technical Field
The invention relates to the field of field test of horizontal stress characteristics of a single-pile foundation, in particular to a device and a method for simulating horizontal load of a pile top in field use.
Background
The coastal region is the most developed economic region in China, and creates the more vigorous demand of infrastructure construction in the region. However, in coastal areas, complicated geology such as mudflats, deep and thick miscellaneous fill, silt, fracture zones and the like are widely distributed, the bearing capacity of many natural foundation soil foundations cannot meet engineering requirements, and pile foundations are a common requirement. The dynamic response of the supporting structure of marine structures such as ports, wharfs and offshore wind turbines is influenced by factors such as wind, waves, currents and ship impact, and the service characteristics of the pile foundation are greatly influenced by the horizontal bearing capacity.
At present, the horizontal bearing capacity test of the pile foundation still stays at the laboratory test and numerical simulation analysis stage, the field test means is vacant, the field construction quality verification lacks effective inspection means, and the field-use simulation pile top horizontal dynamic load device is developed and tested according to the field test means aiming at the current situation.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a device and a method for simulating horizontal dynamic load of a pile top in field.
The technical scheme of the invention is as follows: a horizontal dynamic loading device for simulating a pile top in field use comprises a fixed connection system, an outer supporting system, a disc loading system, a transmission system, a power system and a loading feedback detection system, wherein the fixed connection system is positioned at the bottom of the whole device;
the outer supporting system comprises an upper steel plate and a lower steel plate which are arranged in parallel, the upper steel plate and the lower steel plate are fixedly connected through a plurality of steel columns, rotating bearing seats are arranged on the bottom surface of the upper steel plate and the top surface of the lower steel plate, the upper steel plate is fixedly connected with the power system, and the lower steel plate is fixedly connected with the loading feedback detection system;
the disc loading system comprises a plurality of discs and mass blocks fixed on the discs, the discs are fixed on transmission shafts, the discs drive the mass blocks on the discs to rotate around respective circle centers, a plurality of discs are fixed on each transmission shaft along the axial direction of the transmission shaft, two discs which correspond to each other in position and have opposite rotation directions on the two transmission shafts form a group of basic units, and the disc loading system comprises a plurality of groups of basic units;
the transmission system comprises a plurality of transmission shafts, transmission gears and transmission chains for realizing transmission connection of the transmission gears, bearings are respectively fixed at the top ends and the bottom ends of the transmission shafts, the bearings are respectively arranged in bearing seats of the upper steel plate and the lower steel plate, the transmission gears are fixed on the transmission shafts, and the rotation directions of the two disks in each group of basic units are opposite through the transmission gears and the transmission chains.
In the present invention, preferably, the disc loading system is composed of four groups of basic units, each layer is composed of two groups of basic units, and the four groups of basic units rotate together to provide a resultant force meeting the requirements of field tests.
The transmission system comprises six transmission shafts, each transmission shaft comprises a transmission shaft I, a transmission shaft II, a transmission shaft III, a transmission shaft IV, a transmission shaft V and a transmission shaft VI, two discs are respectively fixed on the transmission shafts III, IV, V and VI, a transmission gear is respectively fixed in the middle of each of the four transmission shafts, a transmission gear is respectively fixed on the end of the transmission shaft III and the end of the transmission shaft V, a transmission gear III is fixed on the end of the transmission shaft I, a change gear I4 is fixed in the middle of the transmission shaft I, a transmission gear is fixed on the end of the transmission shaft II, a change gear II 4 is fixed in the middle of the transmission shaft II, the change gear I and the change gear II are mutually meshed, and a transmission gear I and a transmission gear II are fixed on an output shaft of the power system;
the transmission gear I is in transmission connection with a transmission gear III at the end part of the transmission shaft I through a transmission chain, the transmission gear II is in transmission connection with a transmission gear at the end part of the transmission shaft V through the transmission chain, the transmission gear at the middle part of the transmission shaft V is in transmission connection with a transmission gear at the middle part of the transmission shaft VI through the transmission chain, the transmission gear at the end part of the transmission shaft II is in transmission connection with the transmission gear at the end part of the transmission shaft III through the transmission chain, and the transmission gear at the middle part of the transmission shaft III is in transmission connection with the transmission gear at the middle part of the transmission shaft IV through the transmission chain;
two groups of basic units are formed between the transmission shaft IV and the transmission shaft VI, and two groups of basic units are formed between the transmission shaft III and the transmission shaft V.
The fixed connection system 1 comprises a steel sleeve and a fixed disc, the steel sleeve is fixedly connected with the center of the bottom surface of the fixed disc, a plurality of reinforcing ribs are further arranged between the fixed disc and the steel sleeve, the reinforcing ribs are uniformly arranged at intervals along the circumferential direction of the fixed disc, and the fixed disc is fixedly connected with a loading feedback detection system above the fixed disc.
The loading feedback detection system comprises a cantilever beam type weighing sensor and a punching disc, wherein the punching disc is fixed at the top end and the bottom end of the weighing sensor respectively and fixedly connected with the fixed disc through bolts.
The power system comprises a variable frequency motor, a frequency converter and a flange plate, wherein the flange plate is fixed at the bottom of the variable frequency motor and is fixedly connected with the upper steel plate through the flange plate, and a transmission gear is fixed on an output shaft of the variable frequency motor.
And a round hole is formed in the middle of the upper steel plate, so that an output shaft of the variable frequency motor can extend into the outer support system conveniently.
The invention also comprises a method for simulating the horizontal dynamic load of the pile top by using the device, wherein the disc type loading system comprises a plurality of groups of basic units, each group of basic units comprises two discs with opposite rotation directions, each disc drives the mass block on the disc to rotate around the circle center of each disc, the mass on the disc is m, the motion radius of the mass block is r, the uniform circumferential motion angular speed of the mass block is omega, and the centrifugal force generated by the mass block is Fn，
Fn＝mrω2 (1)
When the mass of the mass blocks on the two disks with the same radius is equal, the uniform-speed symmetrical rotation can generate centrifugal force FnCentrifugal force FnThe two forces are decomposed along the x and y directions, wherein formula (2) is the resultant force of the x direction, and formula (3) is the resultant force of the y direction:
Fx＝Fn sin(θ)-Fn sin(θ)＝0 (2)
Fy＝2mrω2cos(θ)＝2mrω2cos(ωt) (3)
the centrifugal force generated by the rotation of the two mass blocks is superposed to offset the component force in the x direction, and the force with the numerical value in cosine motion and the direction in single-shaft two-way motion is provided.
The invention has the beneficial effects that:
compared with the most common jack type loading mode in the construction site at present, the invention has the advantages of convenient disassembly, assembly and movement, variable amplitude and variable frequency, enough horizontal dynamic load and larger adjustment range, simple use method, full automation, labor cost saving, capability of detecting the load output value in real time and recording the loading process, and realizes the on-site simulation of the horizontal dynamic load of the high-frequency multi-cycle pile top.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the present invention;
FIG. 3 is a schematic structural view of the outer support system of the present invention;
FIG. 4 is a schematic structural diagram of the disc loading system of the present invention;
FIG. 5 is a schematic structural diagram of the transmission system of the present invention;
FIG. 6 is a schematic structural diagram of the powertrain of the present invention;
FIG. 7 is a schematic diagram of the protection system of the present invention;
FIG. 8 is a schematic structural diagram of a loading feedback detection system according to the present invention;
FIG. 9 is a schematic diagram of a centrifugal force fit of two masses in each set of elementary cells.
In the figure: 1 fixing a connecting system; 101 steel sleeve; 102 reinforcing ribs; 103 fixing the disc; 2 external support system; 201, arranging a steel plate; 202, a steel plate; 203 steel columns; 3, a disc loading system; 301 a circular disk; a mass block 302; 4, a transmission system; 401 driving a shaft I; 402 a transmission shaft II; 403 transmission shaft III; 404 a transmission shaft IV; 405 driving shaft V; 406 drive shaft VI; 407 drive gear i; 408 a transmission gear II; 409 a transmission gear III; 4010 a drive chain; 4011 a change gear I; 4012 a change gear II; 4013 a bearing; 5, a power system; 501, a variable frequency motor; 502 frequency converter; 503 flange plates; 6, protecting the system; 7 loading a feedback detection system; 701 a load cell; 702 perforated circular disk.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, the field-use simulation pile top horizontal dynamic loading device of the invention comprises a fixed connection system 1, an outer support system 2, a disc loading system 3, a transmission system 4, a power system 5 and a loading feedback detection system 7, wherein the fixed connection system 1 is positioned at the bottom of the whole device, the loading feedback detection system 7 is arranged between the outer support system 2 and the fixed connection system 1, the disc loading system 3 and the transmission system are arranged in the outer support system 2, the power system 5 is fixed above the outer support system 2, the power system 5 transmits power to the disc loading system 3 through the transmission system 4, the outer side of the whole device is provided with a protection system 6,
the fixed connection system is positioned at the bottom of the device and is used for fixing the device on a test foundation and transferring load. As shown in fig. 2, in the present embodiment, the fixed connection system 1 includes a steel sleeve 101 and a fixed disk 103, the steel sleeve 101 is fixedly welded to the center of the bottom surface of the fixed disk 103, a plurality of reinforcing ribs 102 are further disposed between the fixed disk 103 and the steel sleeve 101, the reinforcing ribs 102 are uniformly spaced along the circumferential direction of the fixed disk 103, and the connection strength between the fixed disk and the steel sleeve is improved by the reinforcing ribs. A plurality of bolt holes are formed in the annular side face of the steel sleeve 101 at intervals and used for screwing bolts to fix the pile head. A plurality of bolt holes are arranged on the fixing disc 103 at intervals and are used for being fixedly connected with the loading feedback detection system 6 above the fixing disc. The contact between the steel sleeve 101 and the pile head is a surface, an evenly distributed load is provided for the pile head instead of a point load loaded by a conventional jack, and the actual stress of the marine pile foundation is simulated more truly.
A loading feedback detection system is fixed above the fixed connection system, as shown in fig. 8, the loading feedback detection system comprises a cantilever beam type weighing sensor 701 and a perforated disc 702, the acquisition precision of the cantilever beam type weighing sensor 701 can reach 1920HZ, and the purpose of monitoring the loading data in real time is achieved. The top end and the bottom end of the weighing sensor 701 are respectively fixed with a perforated disc 702, the perforated disc at the top end is fixedly connected with the outer support system 2 through a bolt, and the perforated disc at the bottom end is fixedly connected with the fixed connection system 1 through a bolt.
As shown in fig. 3, the outer support system 2 includes an upper steel plate 201 and a lower steel plate 202 arranged in parallel, and the upper steel plate 201 and the lower steel plate 202 are fixedly connected through four steel columns 203 to form a main body frame. The bottom surface of the upper steel plate 201 and the top surface of the lower steel plate 202 are both provided with a rotating bearing seat, and the disc loading system is connected with the upper steel plate and the lower steel plate through the rotating bearing seats, so that the stable rotation of the disc loading system in the outer supporting system is realized.
As shown in fig. 4 and 5, the disc loading system includes a plurality of discs 301 and mass blocks 302 fixed on each disc, the discs 301 are fixed on the transmission shaft, and when the transmission shaft drives the discs 301 to rotate, the discs 301 drive the mass blocks thereon to rotate around their respective centers. The mass 302 is removable and the loading amplitude can be adjusted by changing the mass of the mass by changing the material and size of the mass. In this embodiment, the disc loading system includes eight discs 301, where each two discs are fixedly disposed on the same transmission shaft, and two discs corresponding to each other on the two transmission shafts and having opposite rotation directions form a group of basic units, so that the whole disc loading system includes four groups of basic units, which are arranged in two layers, and two groups of basic units on each layer, and four groups of basic units rotate together to provide a resultant force meeting the requirements of the field test. In the present application, the number of the disks is not limited to eight as described in the present embodiment, and other numbers of the disks may be selected according to circumstances. In the working process, real-time load data applied to the pile head through a disc loading system is collected according to a cantilever type weighing sensor 701 of a loading feedback detection system, and the data are transmitted to a computer to calculate the loading size, the loading frequency and the loading cycle number.
The transmission system comprises a plurality of transmission shafts, transmission gears and a transmission chain for realizing transmission connection of the transmission gears, a plurality of discs 301 are arranged on the transmission shafts at intervals along the axial direction of the transmission shafts, bearings 4013 are respectively fixed at the top end and the bottom end of the transmission shafts, and the bearings are respectively arranged in bearing seats of the upper steel plate and the lower steel plate, so that the transmission shafts and the outer support system are rotatably connected. The transmission gear is fixed on the transmission shaft, and the transmission gear and the transmission chain realize that the rotating directions of the two disks in each group of basic units are opposite and the rotating speeds of the disks are the same.
As shown in fig. 5, the transmission system in this embodiment includes six transmission shafts, twelve transmission gears, and five transmission chains, where the transmission shafts are a transmission shaft i 401, a transmission shaft ii 402, a transmission shaft iii 403, a transmission shaft iv 404, a transmission shaft v 405, and a transmission shaft vi 406, where two disks 301 are respectively fixed on the transmission shaft iii 403, the transmission shaft iv 404, the transmission shaft v 405, and the transmission shaft vi 406, and a transmission gear is respectively fixed at the middle of each of the four transmission shafts, and a transmission gear is respectively fixed at the end of the transmission shaft iii 403 and the end of the transmission shaft v 405. The end of the transmission shaft I401 is fixedly provided with a transmission gear III 409, the middle of the transmission shaft I401 is fixedly provided with a change gear I4011, the end of the transmission shaft II 402 is fixedly provided with a transmission gear, the middle of the transmission shaft II 402 is fixedly provided with a change gear II 4012, and the change gear I4011 and the change gear II 4012 are meshed with each other. A transmission gear I407 and a transmission gear II 408 are fixed on an output shaft of the power system, the transmission gear I407 is in transmission connection with a transmission gear III 409 at the end part of a transmission shaft I through a transmission chain 4010, and the transmission gear II 408 is in transmission connection with a transmission gear at the end part of a transmission shaft V405 through a transmission chain 4010. And a transmission gear in the middle of the transmission shaft V405 is in transmission connection with a transmission gear in the middle of the transmission shaft VI 406 through a transmission chain 4010. The transmission gear at the end part of the transmission shaft II 402 is in transmission connection with the transmission gear at the end part of the transmission shaft III 403 through a transmission chain 4010, and the transmission gear at the middle part of the transmission shaft III 403 is in transmission connection with the transmission gear at the middle part of the transmission shaft IV 404 through a transmission chain 4010.
The transmission gear 407 transmits kinetic energy output by a power system to the transmission shaft I401 through the transmission chain 4010, the rotation direction of the transmission shaft I401 is positive rotation, the transmission shaft II 402 is driven to rotate reversely through the meshing between the change gear I4011 and the change gear II 4012, the transmission shaft II 402 drives the transmission shaft III 403 through the transmission chain, at the moment, two round discs fixed on the transmission shaft III 403 rotate reversely, the transmission shaft III 403 drives the transmission shaft IV 404 to rotate reversely through the transmission chain, and at the moment, two round discs fixed on the transmission shaft IV 404 rotate reversely. The drive gear 408 transmits the kinetic energy output by the power system to the drive shaft V405 through the drive chain 4010, at this time, the drive shaft V405 rotates forwards, the two disks fixed on the drive shaft V405 rotate forwards, the drive shaft V405 drives the drive shaft VI 406 to rotate forwards through the drive chain, and at this time, the two disks fixed on the drive shaft VI 406 rotate forwards. Two corresponding disks fixed on the transmission shaft IV 404 and the transmission shaft VI 406 in opposite rotating directions form a group of basic units, and two corresponding disks fixed on the transmission shaft V405 and the transmission shaft III 403 in opposite rotating directions form a group of basic units, so that two groups of basic units are formed between the transmission shaft IV 404 and the transmission shaft VI 406, and two groups of basic units are formed between the transmission shaft III 403 and the transmission shaft V405.
As shown in fig. 6, the power system includes an inverter motor 501, an inverter 502 and a flange plate 503, wherein the flange plate 503 is fixed at the bottom of the inverter motor 501, and the inverter motor 501 is fixed on the upper steel plate 201 of the outer support system through the flange plate 503. In this embodiment, the variable frequency motor 501 is a 2.2kW variable frequency four-stage motor, the frequency converter 502 is a heavy-duty single-phase 220V frequency converter, and the frequency converter 502 is connected to a computer to realize accurate control of the output power of the variable frequency motor. The middle part of the upper steel plate 201 is provided with a round hole so that the output shaft of the variable frequency motor 501 extends into the outer support system 2, and the output shaft is connected with the transmission system.
The outside of whole device is equipped with protection system 6 as shown in fig. 7, and protection system in this embodiment is the steel sheath, through setting up the steel sheath, can avoid the device ageing, causes personnel's damage and loss of property when preventing unexpected situations such as overload from taking place.
When the device is assembled and used on site, a fixed connection system is firstly installed: firstly, sleeving a steel sleeve 101 on the outer side of a pile head, and screwing a bolt into a hole on the side edge of the steel sleeve 101 to fixedly connect the steel sleeve 101 and a pile top into a whole; secondly, the fixed disc 103 of the fixed connection system is fixedly connected with the punching disc 702 of the split loading feedback detection system through bolts and nuts; next, a lower steel plate 202 of the outer support system is fixedly connected above the splicing loading feedback detection system through bolts, and a transmission system and a disc loading system are installed on the lower steel plate 202; then, an upper steel plate 201 of the external support system is installed, an output shaft of the variable frequency motor 501 is inserted into a hole reserved in the upper steel plate 201 in advance, bolts are screwed, the output shaft of the variable frequency motor is connected with a transmission system, and finally the protection system 7 is sleeved outside the whole device.
The invention also comprises a method for simulating the horizontal dynamic load of the pile top by using the device, the disc type loading system comprises a plurality of groups of basic units, each group of basic units comprises two discs with opposite rotation directions, each disc drives the mass block on the disc to rotate around the center of each disc, as shown in figure 8, and the calculation process of the centrifugal force generated by the mass block transmission of each group of basic units is as follows.
Setting the mass of the mass on the disc as m, the motion radius of the mass block as r, the uniform circumferential motion angular velocity of the mass block as omega, and the centrifugal force generated by the mass block as FnAs shown in formula (1).
Fn＝mrω2 (1)
When the mass of the mass blocks on the two disks with the same radius is equal, the uniform-speed symmetrical rotation can generate centrifugal force FnAs can be seen from the force analysis diagram of FIG. 8, the particle force FnCan be decomposed into two forces along the x and y directions, wherein formula (2) is the resultant force of the x direction, and formula (3) is the resultant force of the y direction:
Fx＝Fn sin(θ)-Fn sin(θ)＝0 (2)
Fy＝2mrω2cos(θ)＝2mrω2cos(ωt) (3)
according to the formula, the component force in the x direction is counteracted after the centrifugal forces generated by the rotation of the two mass blocks are superposed, and only one force with the cosine motion value and the single-axis two-way motion direction is provided.
The device and the method for simulating horizontal dynamic loading of the pile top in field use provided by the invention are described in detail above. The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A horizontal dynamic loading device for a simulated pile top used on site is characterized by comprising a fixed connection system (1), an outer support system (2), a disc loading system (3), a transmission system (4), a power system (5) and a loading feedback detection system (7), wherein the fixed connection system (1) is positioned at the bottom of the whole device, the loading feedback detection system (7) is arranged between the outer support system (2) and the fixed connection system (1), the disc loading system (3) and the transmission system (4) are arranged in the outer support system (2), the power system (5) is fixed above the outer support system (2), the power system (5) transmits power to the disc loading system (3) through the transmission system (4), and a protection system (6) is arranged on the outer side of the whole device;
the outer supporting system (2) comprises an upper steel plate (201) and a lower steel plate (202) which are arranged in parallel, the upper steel plate (201) and the lower steel plate (202) are fixedly connected through a plurality of steel columns (203), the bottom surface of the upper steel plate (201) and the top surface of the lower steel plate (202) are both provided with a rotating bearing seat, the upper steel plate (201) is fixedly connected with the power system (5), and the lower steel plate (202) is fixedly connected with the loading feedback detection system (7);
the disc loading system comprises a plurality of discs (301) and mass blocks (302) fixed on the discs, the discs (301) are fixed on transmission shafts, the discs (301) drive the mass blocks on the discs to rotate around respective circle centers, a plurality of discs (301) are fixed on each transmission shaft along the axial direction of each transmission shaft, two discs which are corresponding in position and opposite in rotation on the two transmission shafts form a group of basic units, and the disc loading system comprises a plurality of groups of basic units;
the transmission system comprises a plurality of transmission shafts, transmission gears and transmission chains for realizing transmission connection of the transmission gears, bearings (4013) are respectively fixed at the top ends and the bottom ends of the transmission shafts, the bearings are respectively arranged in bearing seats of the upper steel plate and the lower steel plate, the transmission gears are fixed on the transmission shafts, and the rotation directions of the two disks in each group of basic units are opposite through the transmission gears and the transmission chains.
2. The field-use simulated pile top horizontal dynamic loading device of claim 1, wherein the disc loading system is composed of four groups of basic units, and two groups of basic units are arranged on each layer.
3. The device for simulating the horizontal dynamic loading of the pile top for the field use according to claim 2, wherein the transmission system comprises six transmission shafts, the transmission shafts comprise a transmission shaft I (401), a transmission shaft II (402), a transmission shaft III (403), a transmission shaft IV (404), a transmission shaft V (405) and a transmission shaft VI (406), two discs (301) are respectively fixed on the transmission shaft III (403), the transmission shaft IV (404), the transmission shaft V (405) and the transmission shaft VI (406), a transmission gear is respectively fixed in the middle of the four transmission shafts, transmission gears are respectively fixed on the end part of the transmission shaft III (403) and the end part of the transmission shaft V (405), a transmission gear III (409) is fixed on the end part of the transmission shaft I (401), a direction changing gear I (4011) is fixed in the middle part of the transmission shaft I (401), and a transmission gear is fixed on the end part of the transmission shaft II (402), a change gear II (4012) is fixed in the middle of the transmission shaft II (402), the change gear I (4011) and the change gear II (4012) are meshed with each other, and a transmission gear I (407) and a transmission gear II (408) are fixed on an output shaft of the power system;
the transmission gear I (407) is in transmission connection with a transmission gear III (409) at the end part of the transmission shaft I through a transmission chain, the transmission gear II (408) is in transmission connection with a transmission gear at the end part of the transmission shaft V (405) through a transmission chain, the transmission gear at the middle part of the transmission shaft V (405) is in transmission connection with a transmission gear at the middle part of the transmission shaft VI (406) through a transmission chain, the transmission gear at the end part of the transmission shaft II (402) is in transmission connection with a transmission gear at the end part of the transmission shaft III (403) through a transmission chain, and the transmission gear at the middle part of the transmission shaft III (403) is in transmission connection with a transmission gear at the middle part of the transmission shaft IV (404) through a transmission chain;
two groups of basic units are formed between the transmission shaft IV (404) and the transmission shaft VI (406), and two groups of basic units are formed between the transmission shaft III (403) and the transmission shaft V (405).
4. The device for simulating the horizontal dynamic loading of the pile top for the field use according to claim 1 is characterized in that the fixed connection system (1) comprises a steel sleeve (101) and a fixed disc (103), the steel sleeve (101) is fixedly connected with the center of the bottom surface of the fixed disc (103), a plurality of reinforcing ribs (102) are further arranged between the fixed disc (103) and the steel sleeve (101), the reinforcing ribs (102) are uniformly arranged at intervals along the circumferential direction of the fixed disc (103), and the fixed disc (103) is fixedly connected with the loading feedback detection system (6) above the fixed disc (103).
5. The field-use simulated pile top horizontal dynamic loading device according to claim 4, wherein the loading feedback detection system comprises an cantilever type weighing sensor (701) and a perforated disc (702), the perforated disc (702) is respectively fixed at the top end and the bottom end of the weighing sensor (701), and the perforated disc is fixedly connected with the fixed disc (103) through bolts.
6. The device for simulating horizontal dynamic loading of the pile top for the field use according to claim 1, wherein the power system comprises a variable frequency motor (501), a frequency converter (502) and a flange plate (503), the flange plate (503) is fixed at the bottom of the variable frequency motor (501) and is fixedly connected with the upper steel plate (201) through the flange plate (503), and a transmission gear is fixed on an output shaft of the variable frequency motor (501).
7. The on-site use simulation pile top horizontal dynamic loading device is characterized in that a round hole is formed in the middle of the upper steel plate (201), and an output shaft of the variable frequency motor (501) extends into the outer supporting system (2) through the round hole.
8. A method for simulating the horizontal dynamic load of pile top by using the horizontal dynamic load simulator of the pile top in site according to any one of claims 1 to 7, wherein the disc loading system comprises a plurality of groups of basic units, each group of basic units comprises two discs with opposite rotation directions, each disc drives the mass block on the disc to rotate around the center of each disc, the mass of the mass block on the disc is m, the motion radius of the mass block is r, the uniform-speed circular motion angular velocity of the mass block is omega, and the centrifugal force generated by the mass block is Fn，
Fn＝mrω2 (1)
When the masses of the mass blocks on the two disks with the same radius are equal, the masses are uniformThe rotation of speed symmetry will produce centrifugal force FnCentrifugal force FnThe two forces are decomposed along the x and y directions, wherein formula (2) is the resultant force of the x direction, and formula (3) is the resultant force of the y direction:
Fx＝Fnsin(θ)-Fnsin(θ)＝0 (2)
Fy＝2mrω2cos(θ)＝2mrω2cos(ωt) (3)
the centrifugal force generated by the rotation of the two mass blocks is superposed to offset the component force in the x direction, and the force with the numerical value in cosine motion and the direction in single-shaft two-way motion is provided.
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| CN105372030A (en) * | 2015-09-25 | 2016-03-02 | 浙江大学 | Multi-direction cyclic loading device and method for offshore wind turbine support structure vibration tests |
| CN107023042A (en) * | 2017-04-11 | 2017-08-08 | 青岛理工大学 | Dynamic loading device for pile bearing high-rise structure model test |
| CN108999220A (en) * | 2018-04-28 | 2018-12-14 | 河海大学 | Horizontal cyclic loading system and method for offshore wind turbine pile foundation vibration test |
| CN111119257A (en) * | 2019-12-31 | 2020-05-08 | 青岛理工大学 | Pile top dynamic load simulation device and method |
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| CN105372030A (en) * | 2015-09-25 | 2016-03-02 | 浙江大学 | Multi-direction cyclic loading device and method for offshore wind turbine support structure vibration tests |
| CN107023042A (en) * | 2017-04-11 | 2017-08-08 | 青岛理工大学 | Dynamic loading device for pile bearing high-rise structure model test |
| CN108999220A (en) * | 2018-04-28 | 2018-12-14 | 河海大学 | Horizontal cyclic loading system and method for offshore wind turbine pile foundation vibration test |
| CN111119257A (en) * | 2019-12-31 | 2020-05-08 | 青岛理工大学 | Pile top dynamic load simulation device and method |
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