CN109137914B - Electrodrive vibration pile hammer and pile sinking method - Google Patents
Electrodrive vibration pile hammer and pile sinking method Download PDFInfo
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- CN109137914B CN109137914B CN201811145594.XA CN201811145594A CN109137914B CN 109137914 B CN109137914 B CN 109137914B CN 201811145594 A CN201811145594 A CN 201811145594A CN 109137914 B CN109137914 B CN 109137914B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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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
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Abstract
The invention discloses an electrodrive vibrating pile hammer and a pile sinking method. The invention has the advantages that the excitation frequency of the vibratory pile hammer directly enters the working frequency, and the problem that the vibration of the surrounding environment is overlarge due to the fact that the vibration frequency passes through the resonant frequency of the vibratory pile hammer-pile-foundation system in the process that the excitation frequency is increased from zero to the working frequency when the common vibratory pile hammer is started is solved.
Description
Technical Field
The invention belongs to the field of vibration pile sinking of geotechnical engineering, and particularly relates to an electric drive vibration pile hammer.
Background
In the piling construction of geotechnical engineering, the pile can be pressed into the soil layer by static loading at the top of the pile, and can also be driven into the soil layer by impact load at the top of the pile, but the impact load has a large influence on the surrounding environment, so that the impact piling method is often forbidden in urban areas where buildings stand. At present, a vibration hammer is clamped at the pile top to drive the pile to generate vertical continuous vibration with a certain frequency, in the process, the side friction resistance and the pile end resistance of the pile and soil are reduced, so that the pile is sunk into a foundation, the method has relatively small influence on the surrounding environment, but the vibration hammer generates vertical exciting force by means of rotation of paired eccentric mass blocks, the rotation frequency of the eccentric mass blocks is gradually increased from zero in the starting process, the eccentric mass blocks need to pass through the resonance frequency of the foundation until the stable working rotation frequency is reached, the vibration of the foundation is obviously increased when the rotation frequency of the eccentric mass blocks passes through the resonance frequency of a vibration hammer-pile-foundation system, and particularly, excessive vibration can be caused to adjacent buildings in urban areas, so that the use of the vibration hammer in the urban areas is limited. Therefore, people also develop a resonance-free hammer, namely, when the rotation frequency of a plurality of groups of eccentric mass blocks is close to the resonance frequency of a vibration hammer-pile-foundation system, the vertical and horizontal exciting forces generated by the eccentric mass blocks are mutually offset, so that the vibration influence on the foundation can not be generated when the eccentric mass blocks rotate in an accelerating way to pass through the resonance frequency, and after the rotation speed of the eccentric mass blocks reaches the stable working frequency, the horizontal exciting forces generated by the plurality of groups of eccentric mass blocks are mutually offset and the vertical exciting forces are mutually superposed, thereby driving the pile to vibrate and sink into the foundation. Such resonance-free hammers have been successfully used in urban areas with dense buildings because they have little effect on neighboring buildings, but they are expensive and far exceed the price of conventional vibration hammers. There is therefore a need for a vibro-hammer with an electro-driver that can be tuned directly to the operating frequency of the vibro-hammer, thereby avoiding the process of gradually increasing the frequency from zero to the operating frequency when the conventional vibro-hammer is started, and also avoiding the problem of excessive vibration of adjacent buildings when the starting frequency crosses the resonant frequency of the vibro-hammer-pile-foundation system.
Disclosure of Invention
The invention provides an electrically driven vibratory pile hammer, which aims to solve the problem that the vibration frequency of the surrounding environment is too large due to the fact that the vibration frequency passes through the resonant frequency of a vibratory hammer-pile-foundation system in the process that the vibration frequency is increased from zero to the working frequency when a common vibratory pile hammer is started.
The technical scheme of the invention is as follows: an electrically driven vibratory pile hammer comprising a mass and an electrically driven driver;
the electric drive comprises an alternating power supply and an electric telescopic device, wherein the electric telescopic device comprises a first insulating plate, a first metal plate, an electric telescopic block, a second metal plate and a second insulating plate which are sequentially connected from bottom to top, and the alternating power supply is respectively connected with the first metal plate and the second metal plate; when the voltage difference applied between the first metal plate and the second metal plate by the alternating power supply is changed, namely the electric field intensity received by the electrostriction block is changed, the length of the electrostriction block is also changed;
the mass block and the electrostriction device are sequentially connected from top to bottom.
Preferably, the material of the electrostrictive block is polyurethane elastomer.
Preferably, the electrostriction device is provided with a capacitance detection system and a displacement monitoring system, the capacitance detection system is respectively connected with the first metal plate and the second metal plate, the displacement monitoring system comprises a first accelerometer and a second accelerometer, the first accelerometer is located at the bottom of the side face of the electrostriction block, and the second accelerometer is located at the top of the side face of the electrostriction block. The capacitance detection system can monitor the capacitance C between the first metal plate and the second metal plate; obtaining the displacement s of the bottom of the side surface of the electrostriction block by integrating the acceleration measured by the first accelerometer1And obtaining the displacement s of the top of the side surface of the electrostriction block by integrating the acceleration measured by the second accelerometer2。
Preferably, the electrostriction block is provided with a heat dissipation device, the heat dissipation device comprises a cooling liquid tank, a water pump and a heat dissipation pipe which are sequentially connected, one end of the heat dissipation pipe is connected with cooling liquid in the cooling liquid tank, the other end of the heat dissipation pipe is connected with the water pump, and the heat dissipation pipe is attached to the side face of the electrostriction block for heat dissipation; the water pump drives the cooling liquid in the cooling liquid tank to flow into the radiating pipe and then flow back to the cooling liquid tank.
Preferably, the radiating pipe is internally distributed with shape memory alloy wires, the shape memory alloy wires are in a two-way shape memory effect, the radiating pipe is a straight line at room temperature, a turning point in the straight line is turned during heating, the turning point divides the shape memory alloy wires into a first part straight wire and a second part straight wire, the shape memory alloy wires are in a straight line shape and are attached to the inner wall of the radiating pipe at room temperature, the first part straight wire is fixedly connected with the inner wall of the radiating pipe, the second part straight wire is not fixedly connected with the inner wall of the radiating pipe, and the shape memory alloy wires play a role in stirring cooling liquid; when the temperature of the radiating pipe rises, the shape memory alloy wire is bent at the bending point, the second part of the straight wire is bent to the middle part of the radiating pipe, then the cooling liquid flows through the second part of the straight wire and cools the shape memory alloy wire, then the shape memory alloy wire is changed into a straight line, namely the second part of the straight wire is bent to the inner wall of the radiating pipe, in the process, the shape memory alloy wire is changed into a broken line from the straight line and then is changed into the straight line, and the process can be automatically repeated, so that the shape memory alloy wire plays a role in stirring the cooling liquid, namely the heat of the radiating pipe is accelerated to be taken away by the cooling liquid through the repeated bending deformation of the shape memory alloy wire.
Preferably, the water pump is a flow-rate-adjustable water pump, a thermometer is attached to the side face of the electrostriction block, and when the temperature of the electrostriction block is monitored in real time, the flow rate in the water pump can be increased, so that the cooling of the electrostriction block by the radiating pipe is accelerated.
Preferably, the coolant liquid case is furnished with refrigerating plant, refrigerating plant contains cooling unit, brine pump and the cooling tube that connects gradually, the cooling unit contains the brine pond and cools down the salt solution in the brine pond, the one end and the brine pump of cooling tube are connected and the other end is connected with the brine pond, and the salt solution in the brine pond flows back to the brine pond after flowing into the cooling tube by the drive of brine pump, the cooling tube inserts in the coolant liquid of coolant liquid case.
Preferably, the cooling pipe is provided with a thermoelectric power generation device, the thermoelectric power generation device comprises a thermoelectric power generation unit, a cold end heat transfer plate, a hot end heat transfer plate, a positive electrode lead, a negative electrode lead and a storage battery, the thermoelectric power generation unit is embedded on the side wall of the cooling pipe, the thermoelectric power generation unit comprises a first cold end current-conducting plate, a P-type semiconductor column, a hot end current-conducting plate, an N-type semiconductor column and a second cold end current-conducting plate which are sequentially connected, the first cold end current-conducting plate is connected with the positive electrode lead, the second cold end current-conducting plate is connected with the negative electrode lead, the positive electrode lead and the negative electrode lead are both connected with the storage battery, the hot end heat transfer plate is connected with the hot end current-conducting plate and is in contact with cooling liquid in the cooling liquid tank, and the cold end heat transfer plate; the current generated by the thermoelectric generation unit charges the storage battery.
A pile sinking method of an electrically driven vibratory pile hammer comprises the following steps:
step 1: vertically standing a pile on a foundation soil layer, and connecting the pile, a clamp, an electrostriction device and a mass block together from bottom to top;
step 2: starting an alternating power supply to enable the frequency of an alternating electric field between the first metal plate and the second metal plate to be the working frequency of the vibrating pile hammer, enabling the electrostrictive block to repeatedly stretch and retract along the vertical direction under the alternating electric field to drive the mass block to move, and enabling the electrostrictive block to generate exciting force on the clamp in the process, so that the pile is sunk into the foundation.
Preferably, the method for monitoring the temperature of the electrostrictive block based on the capacitance comprises the following steps: recording the relative dielectric constant of the electrostrictive block through experiments in advancerA temperature-dependent profile; the capacitance detection system monitors the capacitance C between the first metal plate and the second metal plate; obtaining the displacement s of the bottom of the side surface of the electrostriction block by integrating the acceleration measured by the first accelerometer1And obtaining the displacement s of the top of the side surface of the electrostriction block by integrating the acceleration measured by the second accelerometer2Thus combining the initial vertical length L of the electrostrictive block0The vertical length L of the electrostriction block can be obtained in real time as L ═ L0+s2-s1(ii) a The horizontal cross-sectional area of the electrostrictive block is set to be A,0in order to have a dielectric constant in a vacuum,rthe relative dielectric constant of the electrostrictive block clamped between the first metal plate and the second metal plate isrIs calculated by the formula
Relative dielectric constant of electrostrictive block in vibrating pile hammer operation process obtained according to real-time monitoringrAnd then the temperature of the electrostrictive block can be obtained in real time by combining the change curve of the relative dielectric constant with the temperature.
Preferably, when the temperature of the electrostrictive block is monitored based on a thermometer or the temperature of the electrostrictive block is monitored based on a capacitor, the flow speed in the water pump can be increased when the temperature of the electrostrictive block is monitored to be increased, so that the cooling of the electrostrictive block by the radiating pipe is accelerated.
Preferably, the shape memory alloy wire functions to stir the cooling fluid: when the temperature of the radiating pipe rises, the shape memory alloy wire is bent at the bending point, the second part of the straight wire is bent to the middle part of the radiating pipe, then the cooling liquid flows through the second part of the straight wire and cools the shape memory alloy wire, then the shape memory alloy wire is changed into a straight line, namely the second part of the straight wire is bent to the inner wall of the radiating pipe, in the process, the shape memory alloy wire is changed into a broken line from the straight line and then is changed into the straight line, and the process can be automatically repeated, so that the shape memory alloy wire plays a role in stirring the cooling liquid, namely the heat of the radiating pipe is accelerated to be taken away by the cooling liquid through the repeated bending deformation of the shape memory alloy wire.
Preferably, when the coolant tank is provided with a refrigerating device and the cooling pipe is provided with a thermoelectric generation device, the current generated by the thermoelectric generation unit charges the storage battery.
The invention has the advantages that the problem of overlarge vibration of the surrounding environment caused by passing through the resonance frequency of the vibratory hammer-pile-foundation system in the process of increasing the vibration excitation frequency from zero to the working frequency when the common vibratory pile hammer is started is solved, and the invention provides the electrically driven vibratory pile hammer in order to ensure that the vibration excitation frequency of the vibratory pile hammer directly enters the working frequency.
Drawings
FIG. 1 is a schematic view of the main structure of the present invention in cooperation with a pile;
FIG. 2 is a schematic view of an electrostrictive device of the present invention;
FIG. 3 is a schematic view of a heat dissipation device of the present invention;
FIG. 4 is a schematic view of a thermoelectric generation unit on a side wall of a cooling tube according to the present invention;
FIG. 5 is a schematic view of a thermoelectric generation device of the present invention;
FIG. 6 is a schematic view of a shape memory alloy wire for a heat pipe of the present invention;
in the figure, 1, a foundation, 2, a pile, 3, a clamp, 4, an alternating power supply, 5, a capacitance detection system, 6, an electrostrictive device, 7, a mass block, 8, a first insulating plate, 9, a first metal plate, 10, an electrostrictive block, 11, a second metal plate, 12, a second insulating plate, 13, a coolant tank, 14, a water pump, 15, a radiating pipe, 16, coolant, 17, a thermometer, 18, a cooling unit, 19, a brine pump, 20, a cooling pipe, 21, a brine tank, 22, a positive lead, 23, a negative lead, 24, a storage battery, 25, a first cold end, 26, a P-type semiconductor column, 27, a hot end conductive plate, 28, an N-type semiconductor column, 29, a second cold end conductive plate, 30, a cooling pipe side wall, 31, a cold end heat transfer plate, 32, a hot end heat transfer plate, 33, a first accelerometer, 34, a second accelerometer, 35, a shape memory alloy wire, 36. a first part straight wire, 37. a second part straight wire.
Detailed Description
In order to make the technical means, innovative features, objectives and effects of the present invention apparent, the present invention will be further described with reference to the following detailed drawings.
An electrically driven vibrohammer, as in fig. 1-5, comprises a mass 7 and an electric drive;
the electro-strictive device comprises an alternating power supply 4 and an electro-strictive device 6, wherein the electro-strictive device 6 comprises a first insulating plate 8, a first metal plate 9, an electro-strictive block 10, a second metal plate 11 and a second insulating plate 12 which are sequentially connected from bottom to top, and the alternating power supply 4 is respectively connected with the first metal plate 9 and the second metal plate 11; when the voltage difference applied between the first metal plate 9 and the second metal plate 11 by the alternating power source 4 changes, that is, the electric field intensity received by the electrostrictive block 10 changes, the length of the electrostrictive block 6 changes;
the mass block 7 and the electrostriction device 6 are sequentially connected from top to bottom;
the electrostriction block 10 is made of polyurethane elastomer;
the electrostriction device 6 is provided with a capacitance detection system 5 and a displacement monitoring system, the capacitance detection system 5 is respectively connected with the first metal plate 9 and the second metal plate 11, the displacement monitoring system comprises a first accelerometer 33 and a second accelerometer 34, the first accelerometer 33 is positioned at the bottom of the side surface of the electrostriction block 6, and the second accelerometer 34 is positioned at the top of the side surface of the electrostriction block 6; the capacitance detection system 5 can monitor the capacitance C between the first metal plate 9 and the second metal plate 11; the displacement s of the bottom of the side of the electrostrictive block 10 is obtained by integrating the acceleration measured by the first accelerometer 331The displacement s of the top of the side of the electrostrictive block 10 is obtained by integrating the acceleration measured by the second accelerometer 342；
The electrostriction block 10 is provided with a heat dissipation device, the heat dissipation device comprises a cooling liquid tank 13, a water pump 14 and a heat dissipation pipe 15 which are sequentially connected, one end of the heat dissipation pipe 15 is connected with cooling liquid 16 in the cooling liquid tank 13, the other end of the heat dissipation pipe is connected with the water pump 14, and the heat dissipation pipe 15 is attached to the side surface of the electrostriction block 10 for heat dissipation; the water pump 14 drives the cooling liquid 16 in the cooling liquid tank 13 to flow into the radiating pipe 15 and then flow back to the cooling liquid tank 13;
the radiating pipe 15 is internally distributed with a shape memory alloy wire 35, the shape memory alloy wire 35 has a two-way shape memory effect, the wire is a straight line at room temperature, a turning point in the straight line is turned during heating, the turning point divides the shape memory alloy wire 35 into a first part straight wire 36 and a second part straight wire 37, the shape memory alloy wire 35 is in a straight line shape and is attached to the inner wall of the radiating pipe 15 at room temperature, the first part straight wire 36 is fixedly connected with the inner wall of the radiating pipe 15, the second part straight wire 37 is not fixedly connected with the inner wall of the radiating pipe 15, and the shape memory alloy wire 35 plays a role in stirring cooling liquid;
the water pump 14 is a flow-rate-adjustable water pump, the thermometer 17 is attached to the side face of the electrostriction block 10, and when the temperature of the electrostriction block 10 is monitored in real time to rise, the flow rate in the water pump 14 can be increased, so that the cooling of the electrostriction block 10 by the radiating pipe 15 is accelerated;
the cooling liquid tank 13 is provided with a refrigerating device, the refrigerating device comprises a cooling unit 18, a brine pump 19 and a cooling pipe 20 which are sequentially connected, the cooling unit 18 contains a brine pool 21 and cools the brine in the brine pool 21, one end of the cooling pipe 20 is connected with the brine pump 19, the other end of the cooling pipe 20 is connected with the brine pool 21, the brine in the brine pool 21 is driven by the brine pump 19 to flow into the cooling pipe 20 and then flow back to the brine pool 21, and the cooling pipe 20 is inserted into the cooling liquid 16 of the cooling liquid tank 13;
the cooling pipe 20 is provided with a thermoelectric power generation device which comprises a thermoelectric power generation unit, a cold end heat transfer plate 31, a hot end heat transfer plate 32, an anode lead 22, a cathode lead 23 and a storage battery 24, the thermoelectric generation unit is embedded on the side wall of the cooling pipe 20 and comprises a first cold-end conductive plate 25, a P-type semiconductor column 26, a hot-end conductive plate 27, an N-type semiconductor column 28 and a second cold-end conductive plate 29 which are sequentially connected, wherein the first cold-end conductive plate 25 is connected with the positive lead 22, the second cold-end conductive plate 29 is connected with the negative lead 23, the positive lead 22 and the negative lead 23 are both connected with the storage battery 24, the hot side heat transfer plate 32 is connected to the hot side conductive plate 27 and is in contact with the coolant 16 in the coolant tank 13, the cold end heat transfer plates 31 are connected to the first cold end conductive plates 25 and the second cold end conductive plates 29 and are in contact with the brine in the cooling tubes 20; the current generated by the thermoelectric generation unit charges the battery 24.
A pile sinking method of an electrically driven vibratory pile hammer comprises the following steps:
step 1: erecting the pile 2 on the upper surface of the soil layer of the foundation 1 as shown in figure 1, and connecting the pile 2, the clamp 3, the electrostrictive device 6 and the mass block 7 together from bottom to top;
step 2: starting the alternating power supply 4 to enable the frequency of an alternating electric field between the first metal plate 9 and the second metal plate 11 to be the working frequency of the vibrating pile hammer, enabling the electrostrictive block 10 to repeatedly stretch and retract along the vertical direction under the alternating electric field so as to drive the mass block 7 to move, and enabling the electrostrictive block 10 to generate exciting force on the clamp 3 in the process, so that the pile 2 is sunk into the foundation 1.
In the vibration process of the vibratory pile hammer, the method for monitoring the temperature of the electrostrictive block 10 based on the capacitance comprises the following steps: the relative dielectric constant of the electrostrictive block 10 was recorded through experiments in advancerA temperature-dependent profile; the capacitance detection system 5 monitors the capacitance C between the first metal plate 9 and the second metal plate 11; the displacement s of the bottom of the side of the electrostrictive block 10 is obtained by integrating the acceleration measured by the first accelerometer 331The displacement s of the top of the side of the electrostrictive block 10 is obtained by integrating the acceleration measured by the second accelerometer 342Thus combining the initial vertical length L of the electrostrictive block 100The vertical length L of the electrostrictive block 10 can be obtained in real time as L ═ L0+s2-s1(ii) a Let the horizontal cross-sectional area of the electrostrictive block 10 be a,0in order to have a dielectric constant in a vacuum,rthe relative dielectric constant of the electrostrictive block 10 sandwiched between the first metal plate 9 and the second metal plate 11 is set to be equal torIs calculated by the formula
The relative dielectric constant of the electrostrictive block 10 in the running process of the vibratory pile hammer obtained through real-time monitoringrThen, the temperature of the electrostrictive block 10 can be obtained in real time by combining the curve of the relative dielectric constant with the temperature.
In the vibration process of the vibrating pile hammer, when the temperature of the electrostriction block 10 is monitored based on a thermometer or the temperature of the electrostriction block 10 is monitored based on the capacitance detection system 5, the flow rate in the water pump 14 can be increased when the temperature of the electrostriction block 10 is monitored to accelerate the cooling of the electrostriction block 10 by the radiating pipe 15.
The shape memory alloy wire 35 in the radiating pipe 15 plays a role of stirring the cooling liquid: when the temperature of the heat pipe 15 rises, the shape memory alloy wire 35 is bent at the bending point as shown in fig. 6(b), the second part straight wire 37 is bent to the middle part of the inner cavity of the heat pipe 15, then the cooling fluid flows through the second part straight wire 37 and cools the shape memory alloy wire 35, and then the shape memory alloy wire 35 is changed into a straight line as shown in fig. 6(a), i.e., the second part straight wire 37 is bent to the inner wall of the heat pipe 15, in the process, the shape memory alloy wire 35 is changed from the straight line into a broken line and then is changed into the straight line, and the process can be automatically repeated, so that the shape memory alloy wire 35 plays a role of stirring the cooling fluid, i.e., the heat of the heat pipe is accelerated to be taken away by the cooling fluid through the repeated bending deformation of the shape memory.
In the vibration process of the vibration pile hammer, the current generated by the temperature difference power generation unit charges the storage battery 24.
Claims (4)
1. An electrically driven vibratory pile hammer, comprising: it includes a mass block and an electro-driver;
the electric drive comprises an alternating power supply and an electric telescopic device, wherein the electric telescopic device comprises a first insulating plate, a first metal plate, an electric telescopic block, a second metal plate and a second insulating plate which are sequentially connected from bottom to top, and the alternating power supply is respectively connected with the first metal plate and the second metal plate; when the voltage difference applied between the first metal plate and the second metal plate by the alternating power supply is changed, namely the electric field intensity received by the electrostriction block is changed, the length of the electrostriction block is also changed;
the mass block and the electrostriction device are sequentially connected from top to bottom,
the electrostriction device is provided with a capacitance detection system and a displacement monitoring system, the capacitance detection system is respectively connected with the first metal plate and the second metal plate, the displacement monitoring system comprises a first accelerometer and a second accelerometer, the first accelerometer is positioned at the bottom of the side surface of the electrostriction block, the second accelerometer is positioned at the top of the side surface of the electrostriction block,
the electric expansion block is provided with a heat dissipation device, the heat dissipation device comprises a cooling liquid box, a water pump and a heat dissipation pipe which are sequentially connected, one end of the heat dissipation pipe is connected with cooling liquid in the cooling liquid box, the other end of the heat dissipation pipe is connected with the water pump, and the heat dissipation pipe is attached to the side face of the electric expansion block for heat dissipation; the cooling liquid in the cooling liquid box is driven by the water pump to flow into the radiating pipe and then flow back to the cooling liquid box,
the radiating pipe is internally distributed with a shape memory alloy wire, the shape memory alloy wire has a two-way shape memory effect, is a straight line at room temperature, is bent at a turning point in the straight line during heating, and is divided into a first part straight wire and a second part straight wire by the turning point, the shape memory alloy wire is linear and is pasted on the inner wall of the radiating pipe at room temperature, the first part straight wire is fixedly connected with the inner wall of the radiating pipe, the second part straight wire is not fixedly connected with the inner wall of the radiating pipe, the shape memory alloy wire plays a role in stirring cooling liquid, the water pump is a water pump with adjustable flow rate, the side surface of the electrostriction block is pasted with a thermometer,
the cooling liquid tank is provided with a refrigerating device, the refrigerating device comprises a cooling unit, a brine pump and a cooling pipe which are sequentially connected, the cooling unit comprises a brine pool and cools the brine in the brine pool, one end of the cooling pipe is connected with the brine pump, the other end of the cooling pipe is connected with the brine pool, the brine in the brine pool is driven by the brine pump to flow into the cooling pipe and then flow back to the brine pool, the cooling pipe is inserted into the cooling liquid in the cooling liquid tank,
the cooling pipe is provided with a temperature difference power generation device, the temperature difference power generation device comprises a temperature difference power generation unit, a cold end heat transfer plate, a hot end heat transfer plate, a positive electrode lead, a negative electrode lead and a storage battery, the temperature difference power generation unit is embedded on the side wall of the cooling pipe and comprises a first cold end current-conducting plate, a P-type semiconductor column, the hot end current-conducting plate, an N-type semiconductor column and a second cold end current-conducting plate which are sequentially connected, the first cold end current-conducting plate is connected with the positive electrode lead, the second cold end current-conducting plate is connected with the negative electrode lead, the positive electrode lead and the negative electrode lead are both connected with the storage battery, the hot end heat transfer plate is connected with the hot end current-conducting plate and is in contact with cooling liquid in a cooling liquid tank, and the cold end heat transfer plate; the current generated by the thermoelectric generation unit charges the storage battery.
2. A method of sinking an electrically driven vibratory pile hammer as set forth in claim 1, comprising: step 1: vertically standing a pile on a foundation soil layer, and connecting the pile, a clamp, an electrostriction device and a mass block together from bottom to top;
step 2: starting an alternating power supply to enable the frequency of an alternating electric field between the first metal plate and the second metal plate to be the working frequency of the vibrating pile hammer, enabling the electrostrictive block to repeatedly stretch and retract along the vertical direction under the alternating electric field to drive the mass block to move, and enabling the electrostrictive block to generate exciting force on the clamp in the process, so that the pile is sunk into the foundation.
3. A method of sinking an electrically driven vibratory pile hammer as set forth in claim 2, further comprising: the method for monitoring the temperature of the electrostriction block based on the capacitance comprises the following steps: recording the relative dielectric constant of the electrostrictive block through experiments in advancerA temperature-dependent profile; the capacitance detection system monitors the capacitance C between the first metal plate and the second metal plate; obtaining the displacement s of the bottom of the side surface of the electrostriction block by integrating the acceleration measured by the first accelerometer1And obtaining the displacement s of the top of the side surface of the electrostriction block by integrating the acceleration measured by the second accelerometer2Thus combining the initial erection of the electrostrictive blockTo length L0The vertical length L of the electrostriction block can be obtained in real time as L ═ L0+s2-s1(ii) a The horizontal cross-sectional area of the electrostrictive block is set to be A,0in order to have a dielectric constant in a vacuum,rthe relative dielectric constant of the electrostrictive block clamped between the first metal plate and the second metal plate isrIs calculated by the formula
Relative dielectric constant of electrostrictive block in vibrating pile hammer operation process obtained according to real-time monitoringrAnd then the temperature of the electrostrictive block can be obtained in real time by combining the change curve of the relative dielectric constant with the temperature.
4. A method of sinking an electrically driven vibratory pile hammer as set forth in claim 3, comprising: when the temperature of the electrostriction block is monitored based on a thermometer or the temperature of the electrostriction block is monitored based on a capacitor, the flow speed in the water pump can be increased when the temperature of the electrostriction block is monitored to increase the cooling of the electrostriction block by the radiating pipe.
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| CN1947271A (en) * | 2004-04-27 | 2007-04-11 | 日本碍子株式会社 | Elastic body inspection method, inspection device, and dimension prediction program |
| CN102815938A (en) * | 2012-08-27 | 2012-12-12 | 天津大学 | Barium titanate-based lead-free electrostrictive ceramics and preparation method thereof |
| CN205619813U (en) * | 2016-04-20 | 2016-10-05 | 南通江华热动力机械有限公司 | Novel radiator flexible fin vortex device |
| CN206555992U (en) * | 2017-03-17 | 2017-10-13 | 李超 | A kind of large-sized boiler waste heat power generation equipment |
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