Two-dimensional power drive decoupling arrangement type efficient environment-friendly vibrating pile hammer and parameter determination method thereof

Abstract

The invention belongs to the technical field of vibration pile sinking (pulling), and discloses a two-dimensional power drive decoupling arrangement type efficient environment-friendly vibration pile hammer and a parameter determination method thereof. The linear vibration exciter groups and the torsional vibration exciter groups are respectively arranged in a single group or a plurality of groups; the linear vibration exciter groups run synchronously; the torsional vibration exciter groups run synchronously; the linear vibration exciter set and the torsional vibration exciter set are arranged in a decoupling mode. A vibration exciter of the linear vibration exciter set and a vibration exciter of the torsional vibration exciter set are each composed of eccentric rotors driven by various power sources. A two-dimensional power source is adopted to realize a flexible vibration pile sinking and pulling function; meanwhile, up-down vibration and torsional vibration are conducted to meet the pile foundation depth requirement; the overall piling efficiency is obviously improved; the pile driving engineering cost is obviously reduced, and effective pile driving can be achieved under the condition of hard soil; the power consumption is relatively reduced; the pile is not easy to deform or damage; and the dynamic load and noise transmitted to the surrounding environment of the pile are very small.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration pile sinking (extraction), and in particular to a two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibration pile hammer and a parameter determination method thereof. Background Art

[0002] Pile foundations are increasingly used in various construction projects, and vibratory pile hammers (capable of both vibratory pile sinking and pile extraction) are essential equipment for pile foundation construction and are bound to see increasing adoption. This is particularly true for wind power and photovoltaic projects in deserts, tidal flats, or mountainous areas; infrastructure construction projects such as buildings, roads, bridges, and airports; and offshore wind power and offshore platforms. Pile sinking is the first step in these construction processes, and subsequent dismantling requires pile extraction.

[0003] As the core equipment of vibration pile sinking / pulling technology, the performance of the vibratory pile hammer directly affects the efficiency and quality of pile sinking / pulling. The existing conventional pile sinking process is generally divided into hydraulically driven static pressure pile driving, impact pile driving and vibration pile driving. Among them, the vibration pile driving method is the most common. The basic principle of the vibration pile hammer involved in most traditional vibration pile driving or pile pulling methods is: a single exciter (i.e. an eccentric rotor driven by a power source such as a motor / hydraulic / air pressure) or multiple exciters generates an excitation force in a single direction, thereby driving the vibratory pile hammer and the pile to achieve a linear vibration function in a single direction, that is, the traditional pile sinking and pulling methods all use one-dimensional power, which only realizes a linear vibration trajectory in a single direction to achieve the vibration pile sinking and pulling function. Through research and practice, it is known that this driving method has the following shortcomings:

[0004] 1) The pile depth cannot meet the engineering requirements;

[0005] 2) The overall efficiency of the pile driving process is low (i.e., the pile penetration rate is too low);

[0006] 3) Piles driven in by conventional vibration piling technology are difficult to extract later;

[0007] 4) High piling costs (for example, most photovoltaic piles in the desert must be filled with water before they can be driven to the required depth);

[0008] 5) Piling is more difficult in hard soil conditions;

[0009] 6) High power consumption;

[0010] 7) The pile itself is easily deformed / damaged;

[0011] 8) The dynamic loads and noise transmitted to the surrounding environment of the pile are large (for land piling, it affects the health of nearby residents, or affects the safety of nearby buildings or equipment in operation; for offshore piling, it affects the health and reproduction of marine life).

[0012] To address the shortcomings of existing technologies, this invention proposes a highly efficient and environmentally friendly vibratory pile hammer with a two-dimensional power-driven decoupling arrangement. By innovating the vibration mode (using a two-dimensional power drive), redistributing the coupled friction force vector between the pile and the soil, optimizing system parameter determination methods, and enhancing vibration and noise reduction, this design aims to achieve efficient, high-quality, environmentally friendly, noise-reducing, pile-protecting, energy-saving, and easy-to-extract vibratory pile hammer operations, providing a novel solution for pile foundation engineering. Summary of the Invention

[0013] In order to overcome the drawbacks of the prior art, the present invention proposes a two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer.

[0014] The technical solution of the present invention is as follows: a two-dimensional power-driven decoupled high-efficiency and environmentally friendly vibratory pile hammer, comprising a linear vibration exciter group and a torsional vibration exciter group; the linear vibration exciter group and the torsional vibration exciter group are arranged in a single group or multiple groups; the linear vibration exciter groups operate synchronously; the torsional vibration exciter groups operate synchronously; the linear vibration exciter group and the torsional vibration exciter group are decoupled;

[0015] The vibration exciters of the linear vibration exciter group and the vibration exciters of the torsional vibration exciter group are both composed of eccentric rotors driven by various power sources;

[0016] The linear vibration exciter group provides axial linear vibration exciting force, and the torsional vibration exciter group provides circumferential torsional vibration exciting force, and the two are respectively arranged in the vibrating hammer body, and the pile body is rigidly connected to the vibrating hammer body;

[0017] The vibration exciters in the linear vibration exciter group are synchronized through a strong coupling mechanism; the vibration exciters in the torsional vibration exciter group are synchronized through a strong coupling mechanism.

[0018] The linear vibration exciting force is a low frequency large amplitude or a high frequency small amplitude, and the torsional vibration exciting force is a low frequency large amplitude or a high frequency small amplitude.

[0019] The linear vibration exciter group and the torsional vibration exciter group are symmetrically arranged about the axis of the vibrating hammer and the pile in the axial direction.

[0020] The direction of the linear vibration exciting force is perpendicular to the plane where the couple of the torsional vibration exciting force is located. The plane where the couple is located is perpendicular to the axis of the axial direction of the vibrating hammer body, and the axis of the axial direction of the vibrating hammer body passes through the center point of the plane where the couple is located.

[0021] The linear vibration exciter group includes at least two vibration exciters, and an eccentric rotor is arranged on each vibration exciter; when the number of vibration exciters in the linear vibration exciter group is even, the whole is symmetrical about the axis line in the axial direction of the vibration hammer, the mass moments of the eccentric rotors are the same, the phases between adjacent eccentric rotors are symmetrical about the axial direction of the vibration hammer, and they rotate in opposite directions; when the number of vibration exciters in the linear vibration exciter group is odd, the whole is symmetrical about the axis line in the axial direction of the vibration hammer, the phases between adjacent eccentric rotors are symmetrical about the axial direction of the vibration hammer and rotate in opposite directions, and the sum of the mass moments of the eccentric rotors in the clockwise rotation direction is equal to the sum of the mass moments of the eccentric rotors in the counterclockwise rotation direction.

[0022] When the number of vibration exciters in the linear vibration exciter group is 3, the eccentric rotor mass moment of the middle vibration exciter is the sum of the eccentric rotor mass moments of the vibration exciters on both sides of it, and the eccentric rotor mass moments of the vibration exciters on both sides are equal; the phases between adjacent eccentric rotors are symmetrical about the axial direction of the vibration hammer and rotate in opposite directions.

[0023] The torsional vibration exciter group includes at least two torsional vibration exciters; each torsional vibration exciter is a rotating shaft, and two eccentric rotors are arranged on the rotating shaft, respectively located at the two ends of the rotating shaft; the two eccentric rotors on each rotating shaft have the same mass moment and a phase difference of 180°; when the number of torsional vibration exciters is even, the mass moment of the eccentric rotors of each torsional vibration exciter is the same, the directions of adjacent torsional vibration exciters are opposite, and when adjacent eccentric rotors located at the same end are in the axial direction of the vibrating hammer, the phase difference between them is 180°; when the number of torsional vibration exciters is odd, the sum of the mass moments of the eccentric rotors located at the same end in the clockwise rotation direction is equal to the sum of the mass moments of the eccentric rotors located at the same end in the counterclockwise rotation direction, the directions of adjacent torsional vibration exciters are opposite, and when adjacent eccentric rotors located at the same end are in the axial direction of the vibrating hammer, the phase difference between them is 180°.

[0024] When there are three torsional vibration exciters, the directions of the adjacent torsional vibration exciters are opposite; the mass moment of the eccentric rotor of the middle torsional vibration exciter is the sum of the mass moments of the eccentric rotors of the torsional vibration exciters on both sides of it, and the mass moments of the eccentric rotors of the torsional vibration exciters on both sides are equal; when the adjacent eccentric rotors at the same end are in the axial direction of the vibrating hammer, the phase difference between them is 180°.

[0025] The angle between the rotation plane of the vibration exciter of the linear vibration exciter group and the plane where the rotation axis of the torsional vibration exciter group is located is 0-90 degrees.

[0026] The torsional vibration exciter group includes multiple torsional vibration exciters, the rotation centers of each torsional vibration exciter are evenly distributed on the circumference of the same circle, and the centers of strong coupling mechanisms such as gear meshing are located at the center of the circle; the outer circumferences of strong coupling mechanisms such as gear meshing are respectively engaged with the outer circumferences of each torsional vibration exciter; the phase difference between the eccentric rotors of adjacent torsional vibration exciters is 360 / j degrees, j is the number of torsional vibration exciters, and j≥2.

[0027] The angle between the rotation plane of the vibration exciter of the linear vibration exciter group and the plane where the circumference of the torsional vibration exciter group is located is 0-90 degrees.

[0028] When the torsional vibration exciter group is set as multiple groups, the torsional vibration exciter groups of different groups are evenly distributed around the circumference; the adjacent end eccentric rotors of different torsional vibration exciter groups rotate synchronously in the same direction and phase; in each group of torsional vibration exciter groups, the rotating shaft of one torsional vibration exciter is connected to the eccentric rotors at both ends thereof, and the phase difference is 180°; the two eccentric rotors of the remaining torsional vibration exciters of the same torsional vibration exciter group are not connected, and the phase difference between the two is 180°, and they rotate in the opposite direction to the eccentric rotors of the adjacent torsional vibration exciter through a strong coupling mechanism, with symmetrical phases, and when the adjacent eccentric rotors at the same end are in the direction of the axis centerline in the axial direction of the vibrating hammer, the phase difference between them is 180°; there is no intersection between the rotating shafts of different torsional vibration exciter groups.

[0029] A method for determining parameters of a two-dimensional power-driven decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer comprises the following steps:

[0030] Step 1, establish a pile-soil mechanics model;

[0031] According to the two-dimensional dynamic drive model, the magnitude of the vertical excitation and torsional excitation of the vibrating hammer is calculated according to the following formula:

[0032] (1)

[0033] in, is the linear vibration exciting force; is the vertical static pressure; , represents the vertical harmonic load generated by the eccentric rotor, is the exciting eccentricity of the vertical eccentric rotor, , is the vertical excitation frequency; is the torsional torque, The circumferential eccentric rotor generates torsional excitation To the vertical axis of the vibrating hammer The distance between the left and right eccentric rotors is 1, i refers to the direction of the resultant force generated by the left and right eccentric rotors, i=1 and 4 respectively represent the clockwise resultant force generated by the left and right eccentric rotors, i=2 and 3 respectively represent the counterclockwise resultant force generated by the left and right eccentric rotors, is the circumferential excitation eccentricity, , is the torsional excitation frequency;

[0034] In vertical Direction, according to the linear vibration excitation force , so that the vibrating hammer body vibrates up and down; in the circumferential direction Direction, generating torsional excitation through double or multiple pairs of eccentric rotors By controlling the phase angle, the upper and lower centrifugal forces are offset, so that the vibrating hammer generates a total torsional torque. ; Establish a cylindrical coordinate system, the bottom of the vibrating hammer and the top of the pile are connected by a fixed constraint, the vibration hammer motion and excitation are transmitted through the coupling part, the pile and the vibrating hammer realize two-dimensional power drive to achieve two types of vibration forms, and transmit linear vibration excitation force and torsional torque , Represents the torsional moment transmitted at the connection between the vibrating hammer and the pile;

[0035] Step 2: Establish the premise assumptions of pile-soil elastic-plastic dynamic equation;

[0036] 1. Under small strain conditions, the stress-strain relationship of the soil is expressed by a linear elastic model;

[0037] 2. Non-cohesive soil is considered as linear elastic material;

[0038] According to the above assumptions, a two-dimensional dynamic driven vibration pile driving method based on the pile-soil friction redistribution mechanism is given: the torsional moment and vertical harmonic load generated by the vibrating hammer act on the pile together. According to the analysis of the torsional vibration force and vertical vibration force of the pile, the torsional vibration and vertical vibration of the pile are solved respectively. The vertical vibration of the pile is solved by the separation of variables method according to the boundary conditions at both ends of the pile. The vertical vibration of the pile is solved according to the R-K45 method. According to the friction interaction between the pile and the soil, the pile is subjected to a torsional excitation and a vertical excitation to the soil. According to the boundary conditions of the soil, the integral transformation method is used to solve the soil response. According to the mechanism of friction redistribution between the pile and the soil and the difference between the torsional and vertical responses between the pile and the soil, the circumferential friction and the vertical friction are calculated respectively.

[0039] Step 3, establishing the dynamic equation of the two-dimensional power-driven decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer;

[0040] In the process of establishing the pile-soil elastic-plastic dynamic equation, the stress-strain relationship of soil under cyclic load has two major characteristics: nonlinearity and hysteresis. A power function nonlinear dynamic model is used as the bone line equation to reflect the nonlinear relationship of soil under dynamic load. On this basis, the bone line equation is constructed into a nonlinear hysteresis curve according to Masing's double method.

[0041] When establishing the vertical drive model of a two-dimensional power-driven decoupled high-efficiency and environmentally friendly vibratory pile hammer, the direct connection between the vibratory hammer and the pile ensures that the vibratory hammer-pile system has the same motion trajectory. Based on the dynamics of pile-soil interaction, a cubic nonlinear hyperbolic hysteresis model of the vertical motion of the pile is established considering the elastic-plastic properties of the soil. The relationship between the soil restoring force and displacement is taken as follows:

[0042] (2)

[0043] in, is the linear elastic stiffness coefficient of the soil at the bottom of the pile, is the maximum amplitude of the vertical displacement of the pile, is the nonlinear coefficient of the soil reaction at the bottom of the pile, is the maximum value of the restoring force; is a sign function, z represents the vertical direction;

[0044] (3)

[0045] The dynamic equation of the vertical vibration of the pile is:

[0046] (4)

[0047] In formula (4), is the total effective vibrating mass, is the vertical viscous damping coefficient of the soil, is the vertical friction resistance between pile and soil. According to formulas (2) and (3),

[0048] (5)

[0049] , , , , , , , is the natural frequency of the soil under the pile, is the damping ratio;

[0050] Substituting the introduced variables and formula (5) into formula (4), we can obtain:

[0051] (6)

[0052] The above formula is dimensionless, so we get , , , ;

[0053] Substituting Equation (5) into Equation (6), the dimensionless dynamic equation of the cubic nonlinear hyperbolic hysteresis model of the dynamic foundation system is obtained:

[0054] (7)

[0055] in, ;

[0056] (8)

[0057] is the vertical relative displacement of the pile, is the dimensionless restoring force, which is the dimensionless restoring force hyperbolic constitutive relation of the dynamic equation of the vertical vibration of the pile; the soil restoring force-displacement relationship is modeled as the cubic nonlinear hyperbolic hysteresis model of the soil, and R-K45 is introduced to solve the nonlinear equation (7);

[0058] Due to the increased torsional vibration, the pile-soil contact surface experiences circumferential relative motion. Due to the properties of the soil, there is interaction between the soil and the vibrating hammer-pile system, resulting in circumferential frictional resistance in the pile, the magnitude of which is determined by the properties of the soil and the depth. Based on the forces and boundary conditions of the vibrating hammer and the pile, the motion equations of the two are established respectively. Assuming the vibrating hammer is a rigid body, the circumferential differential equation for the force analysis of the vibrating hammer is established as follows:

[0059] (9)

[0060] The vibrating hammer has a solution of the form:

[0061] (10)

[0062] is the moment of inertia of the vibrating hammer, From the initial state The constant that determines Depend on The constant that determines is the undamped natural frequency, , is the natural frequency of damped vibration, is the torsional damping coefficient between pile and soil, is the torsional spring coefficient between pile and soil, is the forced vibration amplitude, , represents the phase difference;

[0063] Assuming the pile is an elastic rod, the torsional vibration wave equation of the pile is established:

[0064] (11)

[0065] The boundary conditions of the pile are:

[0066] (12)

[0067] It is the frictional resistance torque generated by the mutual movement between the outside and inside of the pile and the soil. is the length parameter of the pile;

[0068] The torsional vibration solution of the pile is obtained by separation of variables method;

[0069] (13)

[0070] in, is the density of the pile, is the torsional wave velocity of the pile, is the shear modulus of the pile, is the polar moment of inertia of the pile; by solving equation (11) using the separation of variables method, the coefficients are obtained by combining equations (11), (12) and (13) and coefficients ;

[0071] When the vibrating hammer-pile is torsionally vibrating, the torsional moment formula of the pile at different positions is: as follows:

[0072] (14)

[0073] in, , is the torsional vibration period; the shear stress of the pile at different positions is solved as the pile torsional vibrates ;

[0074] (15)

[0075] is the torsional section coefficient of the pile;

[0076] Step 4, establish soil dynamics equation;

[0077] During the pile sinking process, the frictional resistance torque is generated by the mutual movement between the outside and inside of the pile and the soil. The annular cross-section at the bottom of the pile generates a circular vertical simple harmonic excitation force on the soil. The stress waves generated by the linear vibration excitation force and the torsional torque cause the vertical and circumferential motion of the soil. The vertical and torsional excitations are integrally transformed using the Fourier-Bessel function. After introducing the soil wave equation, the soil wave equation is solved using the Green function to obtain the vertical response, torsional response, and radial response of the soil under the two excitations.

[0078] The wave equation of soil in cylindrical coordinates is established as follows:

[0079] (16)

[0080] is the soil excitation vector, 、 、 Represents the soil in The soil is excited in the direction of The direction of the excitation, the soil The direction is motivated;

[0081]

[0082]

[0083]

[0084]

[0085]

[0086] is the Lamé constant of soil, is the shear modulus of soil;

[0087] Perform a forward Fourier-Bessel transform on the excitation source and soil response;

[0088] (17) (18)

[0089] The corresponding inverse Fourier-Bessel transform is as follows;

[0090] (19)

[0091] (20)

[0092] , 、 、 Represents the soil in The displacement response of the soil in the direction The displacement response of the soil in the direction Displacement response in direction; is an integrating factor, is the cylindrical coordinate axis direction, It's about The matrix, is a Bessel function of the first kind of order n, is the wave number, is the azimuth matrix;

[0093] In formulas (17), (18), (19) and (20),

[0094]

[0095]

[0096]

[0097] Is an indicator used to determine 、 、 When the load is vertical excitation, it is necessary to use The first row of matrix elements and n=0, when the load is a torsional load around the vertical axis, you need to use The second row matrix element n=0; is a Bessel function of the first kind of order n, yes First-order derivative;

[0098] is a diagonal matrix; when the vertical load is about When axisymmetric, , when the load is a torsional load about the vertical axis, ; In the cylindrical coordinate system, the wave equation of the soil is as follows:

[0099] (twenty one)

[0100] is the soil response matrix;

[0101] The wave equation of soil in the frequency-wavenumber domain is as follows:

[0102] (twenty two)

[0103] 、 、 They are the soil in the frequency-wavenumber domain The response of the soil in the frequency-wavenumber domain The response of the soil in the frequency-wavenumber domain Response in direction, 、 、 They are the soil in the frequency-wavenumber domain Directional excitation, soil in the frequency-wave number domain Directional excitation, soil in the frequency-wave number domain Incentives under direction;

[0104] Formula (22) is separated into two uncoupled equations, where the P-wave is a pair of coupled two-degree-of-freedom equations and the S-wave is a single-degree-of-freedom equation. The specific forms of the two equations are as follows:

[0105] (twenty three)

[0106] (twenty four)

[0107] Consider a total thickness of The uniform medium has a free upper surface and a fixed lower surface. And the radius is The frequency of torsional excitation is The harmonic torsional load and vertical excitation frequency are The harmonic vertical load of ; taking the upper surface as the coordinate origin, the circumferential load and vertical load are expressed as follows:

[0108] (25)

[0109] When harmonic torsional loads and harmonic vertical loads are applied to the soil, a torsional resistance torque is generated. The torsional resistance torque is Not related to The shaft is antisymmetric; the Fourier-Bessel transforms of the harmonic torsional load and the harmonic vertical load are as follows:

[0110] (26)

[0111] Equations (23) and (24) with respect to degrees of freedom 、 and is decoupled; in the frequency-wavenumber domain, the soil wave equation is reformulated as follows:

[0112] (27)

[0113] (28)

[0114] The horizontal wave number is recorded as ; To solve equations (27) and (28), consider the boundary conditions and the homogeneous problem and divide it by the shear modulus ; To distinguish specific cases, the solution of soil response is expressed as The wave equation and boundary conditions of the soil are as follows:

[0115] (29)

[0116] , represents the P wave velocity; represents the S wave speed; represents the P-wave characteristic value, Represents the S-wave characteristic value; according to the boundary conditions , for soil and wave number The corresponding normal diffusion mode is, Satisfies the eigenvalue equation and , according to the mode superposition, the wave diffusion problem is solved and the displacement is expressed as the superposition of normal modes; the solution of the annular load is obtained according to the Hankel transformation;

[0117] (30)

[0118] (31)

[0119] is the depth at which the soil is excited, It's the soil The j-order mode in the direction, is the radius of action of the torsional excitation, is the j-order mode of soil in the z direction, The square of the j-order eigenvalue of soil;

[0120] Step 5, redistribution of friction force at the pile-soil interface;

[0121] Due to the increase in torsional torque, the pile generates torsional vibration. When the pile vibrates torsionally, the direction of the friction force at the pile-soil interface changes. The friction force is no longer along the axial direction of the pile, but is opposite to the direction of the velocity at the infinitesimal point on the pile surface. When the velocity and friction force are vector-decomposed into the axial and circumferential directions of the pile, the friction force along the axial direction of the pile is less than the total friction force at the pile-soil interface, thereby reducing the axial friction force at the pile-soil interface. Under the same excitation force or impact load, the penetration speed and depth of the pile are increased.

[0122] Pile-soil interaction is affected by the friction interface description, friction cycle accumulation and elastic-plastic soil response model; friction resistance according to the Mohr-Coulomb criterion It's about depth The function of is as follows:

[0123] (32)

[0124] is the friction between the inner wall of the pile and the soil, is the friction between the pile outer wall and the soil, is the contact area between the inner wall of the pile and the soil, is the contact area between the pile outer wall and the soil, is the pile-soil interaction friction angle, is the viscosity of the soil; is the earth pressure coefficient, is the unit effective deadweight of soil;

[0125] The circumferential friction resistance moment along the pile-soil interface is given by the following formula:

[0126] (33)

[0127] and They are the contact area between the inner wall of the pile and the soil, and the contact area between the outer wall of the pile and the soil; is the internal friction angle of the soil, and are the friction torque at the inner wall and the friction torque at the outer wall of the pile respectively;

[0128] The absolute velocity of movement between pile and soil determines the distribution of friction between pile and soil; the displacement of pile is known. , soil displacement , the speed of the pile , the speed of soil ;

[0129] The relative velocity difference between pile and soil is expressed as follows:

[0130] (34)

[0131] (35)

[0132] is the total relative velocity between pile and soil, Between pile and soil Relative speed in direction, Between pile and soil Relative speed in direction;

[0133] According to the velocity vector decomposition principle (35), the friction force distribution law at the pile-soil friction interface is obtained as follows:

[0134] (36)

[0135] Among them, the circumferential friction resistance , axial friction resistance ;

[0136] According to formula (36), the velocity vector determines the distribution of friction force, and the velocity vector is determined by the ratio of the torsional vibration excitation frequency to the vertical excitation frequency. ; Considering the limit of shear stress that the pile can withstand, the vibration frequency ratio is selected to maximize the effect of two-dimensional power-driven vibration pile driving.

[0137] The beneficial effects of the present invention are as follows: a two-dimensional power source is used to realize the flexible vibration pile sinking and extraction function; up and down vibration and torsional vibration are simultaneously performed to meet the pile foundation depth requirements; the overall pile driving efficiency is significantly improved; the cost of the pile driving project is significantly reduced, and effective pile driving can be achieved even under hard soil conditions; power consumption is relatively reduced; the pile is not easily deformed or damaged; and the dynamic load and noise transmitted to the surrounding environment of the pile are very small. BRIEF DESCRIPTION OF THE DRAWINGS

[0138] Figure 1 This is the structural principle dynamic model of a two-dimensional power-driven decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer.

[0139] Figure 2 This is the first schematic diagram of a two-dimensional power drive decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0140] Figure 3 A second schematic diagram of a two-dimensional power drive decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0141] Figure 4 A third schematic diagram of a two-dimensional power-driven decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0142] Figure 5 A fourth schematic diagram of a two-dimensional power-driven decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0143] Figure 6 A fifth schematic diagram of a two-dimensional power-driven decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0144] Figure 7 The sixth schematic diagram of the two-dimensional power drive decoupling arrangement of the high-efficiency and environmentally friendly vibratory pile hammer;

[0145] Figure 8 A seventh schematic diagram of a two-dimensional power-driven decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0146] Figure 9 The eighth schematic diagram of a two-dimensional power-driven decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0147] Figure 10 A ninth schematic diagram of a two-dimensional power-driven decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0148] Figure 11 This is the tenth schematic diagram of a two-dimensional power-driven decoupling arrangement of an efficient and environmentally friendly vibratory pile hammer;

[0149] Figure 12 This is an eleventh schematic diagram of a two-dimensional power-driven decoupling arrangement of a high-efficiency and environmentally friendly vibratory pile hammer;

[0150] Figure 13 It is a twelfth schematic front view of a two-dimensional power drive decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer;

[0151] Figure 14 It is a twelfth schematic side view of a two-dimensional power drive decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer;

[0152] Figure 15 It is a twelfth schematic top view of a two-dimensional power drive decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer;

[0153] Figure 16 The mechanical model of a two-dimensional, power-driven, decoupled, and efficient, environmentally friendly vibratory pile hammer; (a) is a front view, (b) is a top view of the AA section in (a), (c) is an overall mechanical analysis, and (d) is a partial schematic diagram of the pile tip-soil contact area.

[0154] Figure 17 This is a calculation framework diagram of the mechanical model of a two-dimensional power-driven decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer;

[0155] Figure 18 Schematic diagram of the friction redistribution mechanism at the pile-soil interface; (a) applying a vertical harmonic load, (b) applying a vertical harmonic load and a torsional harmonic load;

[0156] Figure 19 is the stress-strain of soil in cylindrical coordinates;

[0157] Figure 20 is the vertical displacement and velocity of the pile;

[0158] Figure 21 are the rotation angle and angular velocity of the vibratory hammer; (a) is the angle, (b) is the angular velocity;

[0159] Figure 22 are the pile top rotation angle, pile bottom rotation angle and pile body deformation angle;

[0160] Figure 23 is the shear stress of the pile at different positions, (a) is a three-dimensional schematic diagram, (b) is a two-dimensional schematic diagram;

[0161] Figure 24 is the amplitude-frequency characteristic curve of soil when it is excited at r=0.5m,z=2m;

[0162] Figure 25 is the torsional load ( =48Hz) circumferential displacement of soil at z=2m when the radial r changes;

[0163] Figure 26 is the vertical load ( =24Hz) vertical displacement of soil at z=2m when the radial r changes;

[0164] Figure 27 is the torsional load ( =48Hz) circumferential displacement of the soil under r=0.3m as the depth z changes;

[0165] Figure 28 is the vertical load ( =24Hz) radial displacement of soil at r=0.3m with varying depth z;

[0166] Figure 29 is the vertical load ( =24Hz) vertical displacement of soil under r=0.3m with depth z;

[0167] Figure 30 is the vibration frequency ratio Impact on friction distribution;

[0168] Figure 31 is the vibration frequency ratio Effect on the vertical displacement of piles.

[0169] In the figure: 1. Vibrating hammer; 2. Pile; 3. Three-machine coupled horizontally arranged linear vibration exciter group; 4. Two-machine coupled vertically arranged torsional vibration exciter group; 5. Three-gear meshing and other strong coupling mechanisms arranged horizontally; 6. Two-gear meshing and other strong coupling mechanisms in the torsional direction; 7. Three-gear meshing and other strong coupling mechanisms arranged vertically; 8. Three-machine coupled vertically arranged linear vibration exciter group; 9. Two-machine coupled linear vibration exciter group; 10. Four-machine coupled vertically arranged torsional vibration exciter group; 11. Three-machine coupled torsional vibration exciter group; 12. Four-machine coupled linear vibration exciter group; 13. Two-machine coupled horizontally arranged torsional vibration exciter Group; 14. Strong coupling mechanism such as two gear meshing for linear vibration; 15. Strong coupling mechanism such as four gear meshing for torsional vibration; 16. Four-machine coupled circularly arranged torsional vibration exciter group; 17. Strong coupling mechanism such as three gear meshing for torsional vibration; 18. Strong coupling mechanism such as four gear meshing for linear vibration; 19. Strong coupling mechanism such as two gear meshing for torsional vibration; 20. Two groups of linked torsional vibration exciter groups; 21. Strong coupling mechanism such as five gear meshing for torsional vibration; 22. Strong coupling mechanism such as gear meshing for two groups of linked torsional vibration exciter groups; 23. Strong coupling mechanism such as coupling gear meshing for two groups of linked torsional vibration exciter groups. DETAILED DESCRIPTION

[0170] A two-dimensional power driven decoupling arrangement high efficiency and environmentally friendly vibratory pile hammer, such as Figure 1 As shown in the figure, the basic mechanical model structure of the two-dimensional power-driven decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer mainly includes a vibratory hammer body 1, a pile body 2, a linear vibration exciter group, and a torsional vibration exciter group; the vibration exciters in the linear vibration exciter group are synchronized through a strong coupling mechanism; the vibration exciters in the torsional vibration exciter group are synchronized through a strong coupling mechanism.

[0171] Furthermore, the strong coupling mechanism may be a strong coupling mechanism such as gear meshing, a strong coupling mechanism such as a coupling, etc.

[0172] In the present invention, a two-dimensional power source is provided. The two-dimensional power sources act together on the vibrating hammer 1, and the pile body 2 is rigidly fixed on the vibrating hammer 1. Strong coupling mechanisms such as couplings and strong coupling mechanisms such as gear meshing are used to ensure the synchronous operation of the linear vibration exciter group and the torsional vibration exciter group; the two-dimensional power source acting on the vibrating hammer 1 includes a linear vibration excitation force along the axial direction of the vibrating hammer 1 and the pile body 2, that is, a first-dimensional power source F(t), and a torsional vibration excitation force around the axial line of the vibrating hammer 1 and the pile body 2, that is, around the cross-sectional center line of the pile body 2 as a second-dimensional power source M(t); the linear vibration exciter group generates the first-dimensional power source F(t), and the torsional vibration exciter group generates the second-dimensional power source M(t); the linear vibration excitation force along the axial direction of the vibrating hammer 1 and the pile body 2 is realized by the linear vibration exciter group, and the linear vibration excitation force along the axial direction of the vibrating hammer 1 and the pile body 2 is realized by the linear vibration exciter group, and the torsional vibration excitation force along the axial direction of the vibrating hammer 1 and the pile body 2 is realized by the linear vibration exciter group. The linear vibration exciter group is symmetrically arranged about the axial centerline of the vibrating hammer 1 and the pile body 2; the torsional vibration excitation force in the circumferential direction around the axial centerline of the vibrating hammer 1 and the pile body 2 is realized by the torsional vibration exciter group, and the torsional vibration exciter group is symmetrically arranged about the axial centerline of the vibrating hammer 1 and the pile body 2; the first-dimensional power source F(t) and the second-dimensional power source M(t) are simultaneously loaded onto the vibrating hammer 1 with the pile body 2, so that the vibrating hammer 1 and the pile body 2 can simultaneously realize linear vibration in the axial direction and torsional vibration in the circumferential direction around the axial centerline of the two. This vibration form can also be considered as a two-dimensional power-driven composite vibration of the linear vibration in the axial direction of the vibrating hammer 1 and the pile body 2 and the torsional vibration in the circumferential direction around the axial centerline of the two, ultimately realizing the efficient and environmentally friendly vibration pile sinking and pulling function of the vibrating pile hammer.

[0173] The vibration exciter types include eccentric rotor exciters driven by various power sources such as motors, hydraulics, pneumatics, and electromagnetics; the power drive modes of the first-dimensional power source F(t) and the second-dimensional power source M(t) can be motor drive, electromagnetic drive, hydraulic drive, pneumatic drive, etc.; motors such as AC motors, DC motors, servo motors, stepper motors, etc.; hydraulic drives such as hydraulic motors and hydraulic cylinders, etc.; pneumatic drives such as pneumatic motors and cylinders, etc.

[0174] The direction of the linear vibration excitation force of the first-dimensional power source is perpendicular to the plane where the couple of the torsional vibration excitation force of the second-dimensional power source is located, and the plane where the couple is located is parallel to the radial section of the vibrating hammer 1 or the pile body 2; the vibrating hammer 1 can be square, round or other shapes; the pile body 2 can be square, round or other external structures; the vibration frequency and amplitude of the first-dimensional power source and the second-dimensional power source can be equal or unequal; the positions of the first-dimensional power source and the second-dimensional power source can be interchangeable. The linear vibration exciter group providing the first-dimensional power source can adopt multiple groups, and the linkage drive linear vibration function can be achieved through a strong coupling mechanism. The torsional vibration exciter group providing the second-dimensional power source can adopt multiple groups, and the linkage drive torsional vibration function can be achieved through a strong coupling mechanism.

[0175] like Figure 2 As shown, the linear vibration exciter group and the torsional vibration exciter group are decoupled and arranged symmetrically about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. The number of vibration exciters in the linear vibration exciter group is 3, and the 3 vibration exciters are arranged horizontally, which is a three-machine coupled horizontal arrangement linear vibration exciter group 3; the number of torsional vibration exciters in the torsional vibration exciter group is 2, and the 2 torsional vibration exciters are arranged vertically, which is a two-machine coupled vertical arrangement torsional vibration exciter group 4. The vibration exciters in the three-machine coupled horizontal arrangement linear vibration exciter group 3 are synchronized by a strong coupling mechanism 5 such as a horizontal arrangement of three gears; the torsional vibration exciters in the two-machine coupled vertical arrangement torsional vibration exciter group 4 are synchronized by a strong coupling mechanism 6 such as a two-gear meshing in the torsional direction.

[0176] The first-dimensional power source acting on the vibrating hammer 1 and the pile 2 is the linear vibration excitation force along the axial direction of the vibrating hammer 1 and the pile 2. A strong coupling mechanism 5 such as a three-gear meshing arrangement is used to force the eccentric rotors in each vibration exciter in the three-machine coupled transversely arranged linear vibration exciter group 3 to run synchronously. The three-machine coupled transversely arranged linear vibration exciter group 3 is arranged symmetrically about the axis of the axial direction of the vibrating hammer 1 or the pile 2. The mass moment m of the two vibration exciters on both sides of the three-machine coupled transversely arranged linear vibration exciter group 3 is 1 / 2. s r s The mass moment of the vibration exciter in the middle is the sum of the mass moments of the two vibration exciters on both sides, which is 2m s r s; The rotation direction of the vibration exciter located in the middle is opposite to the rotation direction of the vibration exciter located on both sides; when the three-machine coupled transversely arranged linear vibration exciter group 3 operates synchronously, the corresponding three vibration exciters cancel each other out in the exciting forces perpendicular to the axial direction of the vibration hammer 1 and the pile body 2, that is, the resultant force is 0, and the exciting forces in the axial direction of the vibration hammer 1 and the pile body 2 are completely positively superimposed to form a linear vibration exciting force, thereby realizing the linear vibration function in the axial direction of the vibration hammer 1 and the pile body 2. The second-dimensional power source acting on the vibrating hammer 1 and the pile body 2 is the torsional vibration exciting force in the circumferential direction of the axis of the axial direction of the vibrating hammer 1 and the pile body 2; the two-machine coupling vertically arranged torsional vibration exciter group 4 includes two rotating shafts and eccentric rotors arranged on the rotating shafts, and two eccentric rotors are rigidly arranged at both ends of each rotating shaft, with equal mass moments, respectively m0r, and the phase difference between the two eccentric rotors on the same axis is 180 degrees, and a strong coupling mechanism 6 such as two gears meshing in the torsional direction is adopted to realize the forced synchronous operation of the two vibration exciters; when the eccentric rotors at both ends are torsionally engaged When the strong coupling mechanism 6 such as the meshing of two gears in the rotating direction realizes synchronous rotation, a rotating shaft can also be used to realize the synchronous operation of the two vibration exciters; when the two-machine coupled vertically arranged torsional vibration exciter group 4 is synchronously operated, the exciting forces of the two vibration exciters in the axial direction of the vibration hammer 1 and the pile body 2 cancel each other out, that is, the resultant force is 0, and in the plane perpendicular to the axial direction of the vibration hammer 1 and the pile body 2, a completely positive superposition of torsional vibration exciting forces in the circumferential direction around the axis of the vibration hammer 1 and the pile body 2 is formed, thereby realizing the torsional vibration function of the vibration hammer 1 and the pile body 2. The positions of the three-machine coupled horizontally arranged linear vibration exciter group 3 and the two-machine coupled vertically arranged torsional vibration exciter group 4 can be interchangeable; the angle between the vibration exciter rotation plane of the three-machine coupled horizontally arranged linear vibration exciter group 3 and the plane where the rotating shaft of the two-machine coupled vertically arranged torsional vibration exciter group 4 is located can be 0-90 degrees.

[0177] Furthermore, multiple groups of three-machine coupled linear vibration exciter groups 3 are arranged horizontally and a strong coupling mechanism is used to realize the linkage drive linear vibration function, or multiple groups of two-machine coupled torsional vibration exciter groups 4 are arranged vertically and a strong coupling mechanism is used to realize the linkage drive torsional vibration function.

[0178] like Figure 3 As shown, the linear vibration exciter group is decoupled from the torsional vibration exciter group and is symmetrical about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. The linear vibration exciter group is a three-machine coupled vertically arranged linear vibration exciter group 8, which has three vibration exciters arranged along the axial direction of the vibrating hammer 1 and the pile body 2, with a large vibration exciter in the middle and two identical small vibration exciters at the upper and lower ends. The mass moment of the large vibration exciter in the middle is 2m s r s is the mass moment m of the two small vibration exciters sr s The rotation direction of the large vibration exciter is opposite to the rotation direction of the two small vibration exciters.

[0179] The three-machine coupled vertically arranged linear vibration exciter group 8 achieves strong coupling through a strong coupling mechanism 7 such as a vertically arranged three-gear meshing mechanism; when the three-machine coupled vertically arranged linear vibration exciter group 8 operates synchronously, the exciting forces of the corresponding three vibration exciters in the axial direction perpendicular to the vibration hammer 1 and the pile body 2 cancel each other out, that is, the resultant force is 0, and the exciting forces in the axial direction of the vibration hammer 1 and the pile body 2 are completely positively superimposed to form a linear vibration exciting force, thereby realizing the linear vibration function in the axial direction of the vibration hammer 1 and the pile body 2.

[0180] The torsional vibration exciter group is a two-machine coupled vertically arranged torsional vibration exciter group 4 that achieves torsional vibration in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2. The positions of the three-machine coupled vertically arranged linear vibration exciter group 8 and the two-machine coupled vertically arranged torsional vibration exciter group 4 are interchangeable. The angle between the vibration exciter rotation plane of the three-machine coupled vertically arranged linear vibration exciter group 8 and the plane containing the rotation axis of the two-machine coupled vertically arranged torsional vibration exciter group 4 can be 0-90 degrees.

[0181] Furthermore, multiple groups of "three-machine coupled vertically arranged linear vibration exciter groups 8" can be used and the linkage drive linear vibration function can be realized through a strong coupling mechanism, or multiple groups of two-machine coupled vertically arranged torsional vibration exciter groups 4 can be used and the linkage drive torsional vibration function can be realized through a strong coupling mechanism.

[0182] like Figure 4 As shown, the linear vibration exciter group and the torsional vibration exciter group are decoupled and arranged symmetrically about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. The linear vibration exciter group is a two-machine coupled linear vibration exciter group 9, including two vibration exciters with equal mass moments, both m s r s; Through the strong coupling mechanism 14 such as the meshing of two linear vibration gears, the two vibration exciters in the two-machine coupled linear vibration exciter group 9 are ensured to rotate in opposite directions, and the exciting forces in the axial direction perpendicular to the vibration hammer 1 and the pile body 2 cancel each other out, that is, the resultant force is 0, while the exciting forces in the axial direction of the vibration hammer 1 and the pile body 2 are completely positively superimposed to form a linear vibration exciting force, thereby realizing the linear vibration function in the axial direction of the vibration hammer 1 and the pile body 2. The torsional vibration exciter group is a two-machine coupled vertically arranged torsional vibration exciter group 4 that realizes the torsional vibration function in the circumferential direction around the axis of the vibration hammer 1 and the pile body 2. The positions of the two-machine coupled linear vibration exciter group 9 and the two-machine coupled vertically arranged torsional vibration exciter group 4 can be interchanged. The angle β between the rotation plane of the vibration exciter of the two-machine coupled linear vibration exciter group 9 and the plane where the rotation axis of the two-machine coupled vertically arranged torsional vibration exciter group 4 is located is 0-90 degrees.

[0183] Furthermore, multiple groups of "two-machine coupled linear vibration exciter groups 9" can be used and the linkage drive linear vibration function can be realized through a strong coupling mechanism, and multiple groups of "two-machine coupled vertically arranged torsional vibration exciter groups 4" can be used and the linkage drive torsional vibration function can be realized through a strong coupling mechanism.

[0184] like Figure 5 As shown, the linear vibration exciter group is decoupled from the torsional vibration exciter group and is symmetrical about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. The linear vibration exciter group is a two-machine coupled linear vibration exciter group 9. A strong coupling mechanism 14, such as the meshing of two linear vibration gears, ensures that the two vibration exciters rotate in opposite directions, achieving the linear vibration function in the axial direction of the vibrating hammer 1 and the pile body 2.

[0185] The torsional vibration exciter group is a four-machine coupled vertically arranged torsional vibration exciter group 10, which includes four rotating shafts and eccentric rotors arranged on them. Eccentric rotors are rigidly arranged at both ends of each rotating shaft. The mass moment of each eccentric rotor is m0r. The phase difference between the two eccentric rotors on the same axis is 180 degrees. A strong coupling mechanism 15 such as torsional vibration four-gear meshing is used to realize the forced synchronous operation of different vibration exciters. When the eccentric rotors at both ends realize synchronous rotation through a strong coupling mechanism 15 such as torsional vibration four-gear meshing, The synchronous operation of the vibration exciter is achieved by using one, two, or three rotating shafts. When the four-machine coupled vertically arranged torsional vibration exciter group 10 operates synchronously, the excitation forces in the axial direction of the vibrating hammer 1 and the pile body 2 cancel each other out, i.e., the resultant force is zero. In a plane perpendicular to the axial direction of the vibrating hammer 1 and the pile body 2, a completely positively superimposed torsional vibration excitation force couple is formed in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2, thereby achieving the torsional vibration function in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2. The positions of the two-machine coupled linear vibration exciter group 9 and the four-machine coupled vertically arranged torsional vibration exciter group 10 can be interchanged. The angle β between the vibration exciter rotation plane of the two-machine coupled linear vibration exciter 9 and the plane of the rotating shaft of the four-machine coupled vertically arranged torsional vibration exciter 10 is 0-90 degrees. Multiple groups of "two-machine coupled linear vibration exciter groups" can be used and the linkage drive linear vibration function can be realized through a strong coupling mechanism. Multiple groups of "four-machine coupled torsional vibration exciter groups" can be used and the linkage drive torsional vibration function can be realized through a strong coupling mechanism.

[0186] like Figure 6As shown, the linear vibration exciter group and the torsional vibration exciter group are decoupled and arranged symmetrically about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. Among them, the linear vibration exciter group adopts a two-machine coupled linear vibration exciter group 9, and a strong coupling mechanism 14 such as the meshing of two linear vibration gears ensures that the two vibration exciters rotate in opposite directions, thereby realizing the linear vibration function in the axial direction of the vibrating hammer 1 and the pile body 2. The torsional vibration exciter group adopts a three-machine coupled torsional vibration exciter group 11, and a strong coupling mechanism 17 such as the meshing of three torsional vibration gears is used to achieve strong coupling. The three-machine coupled torsional vibration exciter group 11 adopts three rotating shafts, and two eccentric rotors with a phase difference of 180 degrees are arranged at both ends of each rotating shaft. A strong coupling mechanism such as gear meshing is adopted between the rotating shafts. The mass moment of the eccentric rotors at both ends of the middle rotating shaft is large, which is 2m0r. The mass moments of the eccentric rotors at both ends of the upper and lower rotating shafts are equal, which are m0r respectively. The mass moments of the eccentric rotors at both ends of the middle rotating shaft are the sum of the mass moments of the eccentric rotors at both ends of the upper and lower rotating shafts; the three rotating shafts are parallel and arranged along the axial direction of the vibration hammer 1 and the pile body 2, and the rotation direction of the vibration exciter where the middle rotating shaft is located is the same as that of the vibration exciter where the rotating shafts at both ends are located. The exciters rotate in opposite directions; when the eccentric rotors at both ends achieve synchronous rotation through a strong coupling mechanism 17 such as a torsional vibration three-gear meshing, one or two rotating shafts can also be used; when the three-machine coupled torsional vibration exciter group 11 operates synchronously, the exciting forces in the axial direction of the vibrating hammer 1 and the pile body 2 cancel each other out, that is, the resultant force is 0, and in the plane perpendicular to the axial direction of the vibrating hammer 1 and the pile body 2, a completely positive superposition of exciting forces in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2 is formed, thereby achieving a torsional vibration function in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2. The positions of the two-machine coupled linear vibration exciter group 9 and the three-machine coupled torsional vibration exciter group 11 can be interchanged. The angle β between the vibration exciter rotation plane of the two-machine coupled linear vibration exciter group 9 and the plane where the rotating shaft of the three-machine coupled torsional vibration exciter group 11 is located is 0-90 degrees.

[0187] Furthermore, multiple groups of "two-machine coupled linear vibration exciter groups 9" can be used and the linkage drive linear vibration function can be realized through a strong coupling mechanism, and multiple groups of "three-machine coupled torsional vibration exciter groups 11" can be used and the linkage drive torsional vibration function can be realized through a strong coupling mechanism.

[0188] like Figure 7 As shown, the linear vibration exciter group is decoupled from the torsional vibration exciter group and is symmetrical about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. The linear vibration exciter group adopts a four-machine coupled linear vibration exciter group 12, and achieves strong coupling through a strong coupling mechanism 18 such as a linear vibration four-gear meshing; the four-machine coupled linear vibration exciter group 12 includes four vibration exciters, each of which is equipped with an eccentric rotor, and the mass moments of each are m s rs ; When the vibration exciters are running synchronously, the exciting forces perpendicular to the axial direction of the vibrating hammer 1 and the pile body 2 cancel each other out, that is, the resultant force is 0, and the exciting forces in the axial direction of the vibrating hammer 1 and the pile body 2 are completely positively superimposed to form a linear vibration exciting force, thereby realizing the linear vibration function in the axial direction of the vibrating hammer 1 and the pile body 2. The torsional vibration exciter group adopts a two-machine coupled vertically arranged torsional vibration exciter group 4 to realize the torsional vibration function in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2. The positions of the four-machine coupled linear vibration exciter group 12 and the two-machine coupled vertically arranged torsional vibration exciter group 4 can be interchanged. The angle β between the rotation plane of the vibration exciter of the four-machine coupled linear vibration exciter group and the plane where the rotation axis of the two-machine coupled vertically arranged torsional vibration exciter 4 is located is 0-90 degrees.

[0189] Furthermore, multiple groups of "four-machine coupled linear vibration exciter groups 12" can be used and the linkage drive linear vibration function can be realized through a strong coupling mechanism, and multiple groups of "two-machine coupled vertically arranged torsional vibration exciter groups 4" can be used and the linkage drive torsional vibration function can be realized through a strong coupling mechanism.

[0190] like Figure 8 As shown, the linear vibration exciter group and the torsional vibration exciter group are decoupled and arranged symmetrically about the axis of the vibrating hammer and the pile body in the axial direction. The linear vibration exciter group adopts a four-machine coupled linear vibration exciter group 12, and realizes strong coupling through a strong coupling mechanism 18 such as linear vibration four-gear meshing, thereby realizing the linear vibration function in the axial direction of the vibrating hammer 1 and the pile body 2. The torsional vibration exciter group adopts a four-machine coupled vertically arranged torsional vibration exciter group 10 to realize the torsional vibration function in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2. The positions of the four-machine coupled linear vibration exciter group 12 and the four-machine coupled vertically arranged torsional vibration exciter group 10 can be interchanged.

[0191] Furthermore, the angle β between the rotation plane of the vibration exciter of the four-machine coupled linear vibration exciter group 12 and the plane of the rotation axis of the four-machine coupled vertically arranged torsional vibration exciter group 10 is 0-90 degrees. Multiple sets of "four-machine coupled linear vibration exciter groups 12" can be used to achieve a linked linear vibration drive function through a strong coupling mechanism, and multiple sets of "four-machine coupled vertically arranged torsional vibration exciter groups 10" can be used to achieve a linked torsional vibration drive function through a strong coupling mechanism.

[0192] like Figure 9As shown, the linear vibration exciter group and the torsional vibration exciter group are decoupled and arranged symmetrically about the axial axis of the vibrating hammer 1 and the pile body 2. The linear vibration exciter group adopts a four-machine coupled linear vibration exciter group 12, and achieves strong coupling through a strong coupling mechanism 18 such as a linear vibration four-gear meshing, thereby realizing the linear vibration function in the axial direction of the vibrating hammer 1 and the pile body 2. The torsional vibration exciter group adopts a three-machine coupled torsional vibration exciter group 11, and achieves strong coupling through a strong coupling mechanism 17 such as a torsional vibration three-gear meshing, thereby realizing the torsional vibration function in the circumferential direction around the axial centerline of the vibrating hammer and the pile body.

[0193] Furthermore, the positions of the four-machine coupled linear vibration exciter group 12 and the three-machine coupled torsional vibration exciter group 11 can be interchanged. The angle β between the vibration exciter rotation plane of the four-machine coupled linear vibration exciter group 12 and the plane where the rotation axis of the three-machine coupled torsional vibration exciter group 11 is located is 0-90 degrees.

[0194] Furthermore, multiple groups of "four-machine coupled linear vibration exciter groups 12" can be used and the linkage drive linear vibration function can be realized through a strong coupling mechanism, and multiple groups of "three-machine coupled torsional vibration exciter groups 11" can be used and the linkage drive torsional vibration function can be realized through a strong coupling mechanism.

[0195] like Figure 10 As shown, the linear vibration exciter group and the torsional vibration exciter group are arranged in a decoupled manner and are symmetrical about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. Among them, the linear vibration exciter group adopts a two-machine coupled linear vibration exciter group 9, and a strong coupling mechanism 14 such as the meshing of two linear vibration gears ensures that the two vibration exciters rotate in opposite directions, thereby realizing the linear vibration function in the axial direction of the vibrating hammer 1 and the pile body 2. The torsional vibration exciter group adopts a two-machine coupled transversely arranged torsional vibration exciter group 13, and a strong coupling mechanism 19 such as the meshing of two torsional vibration gears realizes reverse strong coupling rotation.

[0196] The two-machine coupled transversely arranged torsional vibration exciter group 13 includes two rotating shafts and eccentric rotors at both ends thereof, and the mass moment of each eccentric rotor is m0r; the phases of the two eccentric rotors on the same axis of the two rotating shafts differ by 180 degrees, and the two rotating shafts are arranged transversely; when the two eccentric rotors at the same end of the two rotating shafts but on different rotating shafts rotate to a position perpendicular to the plane where the axis of the vibrating hammer 1 and the pile body 2 is located, the phase relationship of the two eccentric rotors at the same end is the same phase, while the phases of the two groups of eccentric rotors at different ends differ by 180 degrees; when the two-machine coupled transversely arranged torsional vibration exciter group 13 operate synchronously, the exciting forces in the axial direction of the vibrating hammer 1 and the pile body 2 cancel each other out, that is, the resultant force is 0, and a completely positively superimposed torsional vibration exciting force couple is formed in the plane perpendicular to the axial direction of the vibrating hammer 1 and the pile body 2 in the circumferential direction of the axis, thereby realizing the torsional vibration function in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2. The positions of the two-machine coupled linear vibration exciter group 9 and the two-machine coupled transversely arranged torsional vibration exciter group 13 can be interchanged.

[0197] Furthermore, the angle β between the vibration exciter rotation plane of the two-machine coupled linear vibration exciter 9 and the plane containing the rotation axis of the two-machine coupled transversely arranged torsional vibration exciter group 13 is 0-90 degrees. Multiple sets of "two-machine coupled linear vibration exciter groups 9" can be used to achieve a linked linear vibration drive function through a strong coupling mechanism, and multiple sets of "two-machine coupled transversely arranged torsional vibration exciter groups 13" can be used to achieve a linked torsional vibration drive function through a strong coupling mechanism.

[0198] like Figure 11 As shown, the linear vibration exciter group and the torsional vibration exciter group are decoupled and arranged symmetrically about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. The linear vibration exciter group adopts a four-machine coupled linear vibration exciter group 12, and realizes strong coupling through a strong coupling mechanism 18 such as the meshing of four linear vibration gears, thereby realizing the linear vibration function in the axial direction of the vibrating hammer 1 and the pile body 2. The torsional vibration exciter group adopts a two-machine coupled transversely arranged torsional vibration exciter group 13, and realizes reverse strong coupling rotation through a strong coupling mechanism 19 such as the meshing of two torsional vibration gears, thereby realizing the torsional vibration function in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2. The positions of the four-machine coupled linear vibration exciter group 12 and the two-machine coupled transversely arranged torsional vibration exciter group 13 can be interchanged.

[0199] Furthermore, the angle β between the rotation plane of the vibration exciter of the four-machine coupled linear vibration exciter 12 and the plane of the rotation axis of the two-machine coupled transversely arranged torsional vibration exciter group 13 is 0-90 degrees. Multiple sets of "four-machine coupled linear vibration exciter groups 12" can be used to achieve a linked linear vibration drive function through a strong coupling mechanism, and multiple sets of "two-machine coupled transversely arranged torsional vibration exciter groups 13" can be used to achieve a linked torsional vibration drive function through a strong coupling mechanism.

[0200] like Figure 12 As shown, the linear vibration exciter group is decoupled from the torsional vibration exciter group and is symmetrical about the axial axis of the vibrating hammer 1 and the pile body 2. The linear vibration exciter group uses a four-machine coupled linear vibration exciter group 12, and achieves strong coupling through a strong coupling mechanism 18 such as a linear vibration four-gear meshing mechanism, thereby achieving linear vibration in the axial direction of the vibrating hammer 1 and the pile body 2.

[0201] The torsional vibration exciter group adopts a four-machine coupled circumferential arrangement torsional vibration exciter group 16, which includes four eccentric rotors and a torsional vibration five-gear meshing and other strong coupling mechanisms 21 in the torsional plane. The mass moments of the four eccentric rotors are m0r respectively; the rotation planes of the four eccentric rotors are perpendicular to the axis of the vibrating hammer 1, and the torsional vibration five-gear meshing and other strong coupling mechanisms 21 are realized by meshing the central main gear with the eccentric rotor gear, and its axis is The axis of the vibrating hammer 1 coincides with the axis of the central main gear, and the outer peripheries of the four eccentric rotor gears, which rotate in the same direction and are evenly distributed around the circumference of the central main gear, mesh with the outer periphery of the central main gear. The phase difference between two adjacent eccentric rotors is fixed at 90 degrees. When the four-machine coupled circumferentially arranged torsional vibration exciter group 16 operates synchronously, it only generates a torsional vibration excitation force couple in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2, thereby achieving the torsional vibration function in the circumferential direction around the axis of the vibrating hammer 1 and the pile body 2. The positions of the four-machine coupled linear vibration exciter group 12 and the four-machine coupled circumferentially arranged torsional vibration exciter group 16 are interchangeable.

[0202] Furthermore, multiple groups of "four-machine coupled linear vibration exciter groups 12" can be used and a strong coupling mechanism can be used to realize the linkage-driven linear vibration function. The number of eccentric rotors in the four-machine coupled circumferentially arranged torsional vibration exciter group 16 can be expanded to j, j ≥ 2, j is a natural number, that is, it becomes a j-machine coupled torsional vibration exciter group, and the j eccentric rotors are evenly distributed on a circumferential plane perpendicular to the axis of the vibrating hammer 1 and the pile body 2 and with the axis as the center. Forced synchronous operation is achieved through a strong coupling mechanism such as the meshing of the j+1th meshing gears, and the phase difference between the two adjacent eccentric rotors is fixed at 360 / j degrees in sequence, thereby realizing the torsional vibration function of the vibrating hammer 1 and the pile body 2 driven by the "j-machine coupled torsional vibration exciter group" linkage.

[0203] like Figure 13-15 As shown, the linear vibration exciter group is decoupled from the torsional vibration exciter group and arranged symmetrically about the axis of the axial direction of the vibrating hammer 1 and the pile body 2. The linear vibration exciter group uses a two-machine coupled linear vibration exciter group 9, which ensures the two vibration exciters rotate in opposite directions through a strong coupling mechanism 14 such as the meshing of two linear vibration gears, thereby achieving the linear vibration function in the axial direction of the vibrating hammer 1 and the pile body 2. Multiple sets of "two-machine coupled linear vibration exciter groups 9" can be used to achieve the linked drive linear vibration function through the strong coupling mechanism. The torsional vibration exciter group adopts two groups of linked torsional vibration exciter groups 20, that is, two groups of "two-machine coupled torsional vibration exciter groups" are used for linkage drive. The two groups of "two-machine coupled torsional vibration exciter groups" are evenly distributed or symmetrically arranged on the circumference in a plane perpendicular to the axis of the vibrating hammer 1 and the pile body 2 and centered on the axis. The two groups of linked torsional vibration exciter groups are synchronized by strong coupling mechanisms 22 such as gear meshing and coupling gear meshing of the two groups of linked torsional vibration exciter groups. Strong coupling mechanisms 23 such as coupling gear meshing of the two groups of linked torsional vibration exciter groups achieve synchronous operation, forming a torsional vibration excitation force couple in the circumferential direction of the axis of the vibrating hammer 1 and the pile body 2, realizing the linkage drive torsional vibration function of the vibrating hammer 1 and the pile body 2 in the circumferential direction of their own axis; the torsional vibration exciter group can also adopt more groups of "two-group linked torsional vibration exciter groups 20" and realize strong coupling linkage drive through strong coupling mechanisms such as gear meshing and couplings, thereby realizing the linkage drive torsional vibration function of the vibrating hammer 1 and the pile body 2. The positions of the two coupled linear vibration exciter groups 9 and the two linked torsional vibration exciter groups 20 can be interchanged. The angle between the vibration exciter rotation plane of the two coupled linear vibration exciter groups 9 and the vibration exciter rotation plane of the two linked torsional vibration exciter groups 20 is 0-90 degrees.

[0204] Example: Numerical analysis of pile-soil coupled dynamics during two-dimensional dynamic driven vibration pile sinking and extraction;

[0205] During simulation, a frequency corresponding to the maximum amplitude is selected as the torsional frequency according to the amplitude-frequency characteristic curve for analysis and numerical comparison; the vertical vibration frequency is selected as 24 Hz; and the excitation frequency range of the amplitude-frequency characteristic curve of the soil is selected as 0-150 Hz.

[0206] (1) Comparison of TSM (theoretical solution method) and FEM (numerical solution method) for the response of the vibratory hammer-pile system;

[0207] exist Figure 20 In the figure, we can see the vertical relative displacement and velocity curve of the pile solved according to RK-45. From the curve, we can see that during the penetration process of the pile, as the penetration depth increases, the penetration rate of the pile gradually decreases. When the penetration depth reaches a certain depth, the pile no longer continues to sink, but vibrates in situ. Figure 21 The curve in the figure shows the rotation angle and angular velocity of the vibrating hammer during torsional vibration. The angular vibration amplitude is 0.00664 rad ( Figure 21 (a)), the angular velocity vibration amplitude is 2rad / s( Figure 21 (b)).

[0208] exist Figure 22 The curve in the middle represents the pile response under torsional moment, and the blue and red curves represent the rotation angles of the pile top and bottom, respectively. Figure 22 It can be clearly seen that the rotation angles of the two are different. This is because there is a rotation angle difference between the pile bottom and the pile top due to the friction resistance torque of the soil. The magenta dotted line represents the angle difference between the pile top and the pile bottom (also called torsional deformation). Figure 23 The analytical and numerical results of the shear stress of the pile are compared in Figure 23 (z=0m), (z=2m), (z=4m) and (z=7m) in (a) represent the shear stress at different positions of the pile. From the results, we can see that the shear stress at the top of the pile is equal to The shear stress at the bottom of the pile is equal to , and the shear stress gradually decreases from the pile top to the pile bottom. When the torque at the bottom of the pile changes suddenly, stress fluctuations will occur. The stress waves will propagate along the pile body, causing fluctuations in the simulation results ( Figure 23 (b)).

[0209] (2) Comparison of soil response between TSM and FEM

[0210] When studying the torsional vibration frequency, the amplitude-frequency characteristics of the soil were analyzed. Figure 24 This is a comparison between the theoretical solution and the results obtained by numerical simulation. The torsional vibration frequency gradually increases from 0Hz to 150Hz. From the curve, it can be seen that the maximum amplitude is around 48Hz.

[0211] Calculate the effects of torsional vibration and vertical vibration on soil. The torsional and vertical vibration frequencies are selected as =48Hz and =24Hz. Figure 25 and Figure 26 The propagation trend of the soil vibration response along the radial coordinate under torsional vibration and vertical vibration is reflected respectively. Figure 25 It can be seen that the soil responds most strongly at the torsional excitation radius. As the radial wave number increases, the radial wave number ( ) is equal to 1, the torsional response of the soil has decayed to zero. Figure 26The vertical displacement response curve of the soil under vertical excitation can be seen in the figure, and the response of the soil is the largest at the excitation radius. As the radial wave number increases, the vertical response of the soil oscillates and decays with the increase of the radial wave number. When the radial wave number ( ) is equal to 8, the torsional response can be ignored.

[0212] exist Figure 27 , 28 and 29 show the response of soil at different depths under torsional and vertical vibrations. Figures 27-29 When the load is applied at depth m and radius When the load is applied at m, the soil response is the largest, and as the distance from the vibration source in the vertical coordinate increases, the soil response decays rapidly. Figure 29 In the figure, since the ground surface (z=0m) is in a free state, the soil will be affected by the stress wave and the displacement will not be zero. At the depth of z=4m (fixed constraint), the response of the soil will gradually decay to zero.

[0213] (3) Vibration frequency ratio the impact of;

[0214] Study the influence of torsional vibration frequency and vertical vibration frequency on friction force distribution. Figure 30 As shown, when (torsional vibration frequency =0Hz, vertical frequency =24Hz), the vertical friction between the pile and the soil is equal to the total friction force of 11676N (red dashed line); when (torsion frequency is =24Hz, vertical frequency =24Hz), the vertical friction force is 8256N (blue dotted line) and the circumferential friction force is 8256N (blue solid line); when (torsion frequency is =48Hz, vertical frequency =24Hz), the vertical friction force is 5222N (magenta dotted line) and the circumferential friction force is 104400N (magenta solid line). During the pile driving process, the vertical friction force (pile sinking resistance) is the cause of the obstruction to pile sinking, while the circumferential friction resistance has no obstruction to pile sinking. Figure 30 The calculation results show that with the increase of the frequency ratio, the vertical friction force decreases, while the circumferential friction force increases.

[0215] According to the friction redistribution mechanism, the , and Three vibration frequency ratios The calculation results under the condition of Figure 31It can be seen that when the penetration depth When , corresponding to three points (62.95s, 2m), (49.73s, 2m) and (42.98s, 2m), the pile driving time decreases with the increase of vibration frequency ratio. When the pile driving time t=150s, the corresponding three points (150s, 2.643m), (150s, 3.469m) and (150s, 4.616m). As the vibration frequency ratio increases, the pile penetration depth increases. Comparison of the calculation results shows that the friction redistribution mechanism is effective and that increasing torsional vibration can increase the pile penetration speed and depth.

Claims

1. A two-dimensional power driven decoupling arrangement type high efficiency and environmentally friendly vibratory pile hammer, characterized in that: It comprises a linear vibration exciter group and a torsional vibration exciter group; the linear vibration exciter group and the torsional vibration exciter group are arranged in a single group or multiple groups respectively; the linear vibration exciter groups operate synchronously; the torsional vibration exciter groups operate synchronously; the linear vibration exciter group and the torsional vibration exciter group are decoupled; The vibration exciters of the linear vibration exciter group and the vibration exciters of the torsional vibration exciter group are both composed of eccentric rotors driven by various power sources; The linear vibration exciter group provides an axial linear vibration excitation force, and the torsional vibration exciter group provides a circumferential torsional vibration excitation force, and the two are respectively arranged in the vibrating hammer body (1), and the pile body (2) is rigidly connected to the vibrating hammer body (1); The vibration exciters in the linear vibration exciter group are synchronized through a strong coupling mechanism; the vibration exciters in the torsional vibration exciter group are synchronized through a strong coupling mechanism.

2. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 1 is characterized in that: The linear vibration exciting force is a low frequency large amplitude or a high frequency small amplitude, and the torsional vibration exciting force is a low frequency large amplitude or a high frequency small amplitude.

3. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 1 is characterized in that: The linear vibration exciter group and the torsional vibration exciter group are respectively arranged symmetrically about the axis center lines of the vibrating hammer (1) and the pile body (2) in the axial direction.

4. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 1 is characterized in that: The direction of the linear vibration exciting force is perpendicular to the plane where the couple of the torsional vibration exciting force is located, the plane where the couple is located is perpendicular to the axis of the axial direction of the vibrating hammer (1), and the axis of the axial direction of the vibrating hammer (1) passes through the center point of the plane where the couple is located.

5. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 1 is characterized in that: The linear vibration exciter group includes at least two vibration exciters, and an eccentric rotor is arranged on each vibration exciter; when the number of vibration exciters in the linear vibration exciter group is an even number, the whole is symmetrical about the axis line of the axial direction of the vibration hammer (1), the mass moments of the eccentric rotors are the same, the phases between adjacent eccentric rotors are symmetrical about the axial direction of the vibration hammer (1), and they rotate in opposite directions; when the number of vibration exciters in the linear vibration exciter group is an odd number, the whole is symmetrical about the axis line of the axial direction of the vibration hammer (1), the phases between adjacent eccentric rotors are symmetrical about the axial direction of the vibration hammer (1) and they rotate in opposite directions, and the sum of the mass moments of the eccentric rotors in the clockwise rotation direction is equal to the sum of the mass moments of the eccentric rotors in the counterclockwise rotation direction.

6. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 5 is characterized in that: When the number of vibration exciters in the linear vibration exciter group is 3, the mass moment of the eccentric rotor of the middle vibration exciter is the sum of the mass moments of the eccentric rotors of the vibration exciters on both sides thereof, and the mass moments of the eccentric rotors of the vibration exciters on both sides are equal; the phases between adjacent eccentric rotors are symmetrical about the axial direction of the vibration hammer (1) and rotate in opposite directions.

7. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 1 is characterized in that: The torsional vibration exciter group includes at least two torsional vibration exciters; each torsional vibration exciter is a rotating shaft, and two eccentric rotors are arranged on the rotating shaft, respectively located at the two ends of the rotating shaft; the mass moments of the two eccentric rotors on each rotating shaft are the same and the phase difference is 180 degrees; when the number of torsional vibration exciters is an even number, the mass moments of the eccentric rotors of each torsional vibration exciter are the same, the directions of adjacent torsional vibration exciters are opposite, and when adjacent eccentric rotors located at the same end are in the axial direction of the vibrating hammer (1), the phase difference between them is 180 degrees; when the number of torsional vibration exciters is an odd number, the sum of the mass moments of the eccentric rotors located at the same end in the clockwise direction is equal to the sum of the mass moments of the eccentric rotors located at the same end in the counterclockwise direction, the directions of adjacent torsional vibration exciters are opposite, and when adjacent eccentric rotors located at the same end are in the axial direction of the vibrating hammer (1), the phase difference between them is 180 degrees.

8. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 7 is characterized in that: When there are three torsional vibration exciters, the directions of the adjacent torsional vibration exciters are opposite; the mass moment of the eccentric rotor of the middle torsional vibration exciter is the sum of the mass moments of the eccentric rotors of the torsional vibration exciters on both sides thereof, and the mass moments of the eccentric rotors of the torsional vibration exciters on both sides are equal; when the adjacent eccentric rotors at the same end are in the axial direction of the vibrating hammer (1), the phase difference between them is 180 degrees.

9. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 7 or 8, characterized in that: The angle between the rotation plane of the vibration exciter of the linear vibration exciter group and the plane where the rotation axis of the torsional vibration exciter group is located is 0-90 degrees.

10. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 1, characterized in that: The torsional vibration exciter group includes multiple torsional vibration exciters, the rotation centers of each torsional vibration exciter are evenly distributed on the circumference of the same circle, and the centers of strong coupling mechanisms such as gear meshing are located at the center of the circle; the outer circumferences of strong coupling mechanisms such as gear meshing are respectively engaged with the outer circumferences of each torsional vibration exciter; the phase difference between the eccentric rotors of adjacent torsional vibration exciters is 360 / j degrees, j is the number of torsional vibration exciters, and j≥2.

11. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 10, characterized in that: The angle between the rotation plane of the vibration exciter of the linear vibration exciter group and the plane where the circumference of the torsional vibration exciter group is located is 0-90 degrees.

12. The two-dimensional power-driven decoupling arrangement type high-efficiency and environmentally friendly vibratory pile hammer according to claim 1, characterized in that: When the torsional vibration exciter group is set as multiple groups, the torsional vibration exciter groups of different groups are evenly distributed around the circumference; the adjacent eccentric rotors of different torsional vibration exciter groups rotate synchronously in the same direction and phase; in each torsional vibration exciter group, the rotating shaft of one torsional vibration exciter is connected to the eccentric rotors at both ends thereof, and the phase difference is 180 degrees; the two eccentric rotors of the remaining torsional vibration exciter groups in the same torsional vibration exciter group are not connected, and the phase difference between the two is 180 degrees, and the eccentric rotors of the adjacent torsional vibration exciter rotate in the opposite direction through a strong coupling mechanism, and the phases are symmetrical, and when the adjacent eccentric rotors at the same end are in the direction of the axis line of the axial direction of the vibrating hammer (1), the phase difference between them is 180 degrees; there is no intersection between the rotating shafts of different torsional vibration exciter groups.

13. A method for determining parameters of a two-dimensional power-driven decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer according to any one of claims 1 to 12, characterized in that: The steps are as follows: Step 1, establish a pile-soil mechanics model; According to the two-dimensional dynamic drive model, the magnitude of the vertical excitation and torsional excitation of the vibrating hammer is calculated according to the following formula: (1) ； in, is the linear vibration exciting force; is the vertical static pressure; , represents the vertical harmonic load generated by the eccentric rotor, is the exciting eccentricity of the vertical eccentric rotor, , is the vertical excitation frequency; is the torsional torque, The circumferential eccentric rotor generates torsional excitation To the vertical axis of the vibrating hammer The distance between the left and right eccentric rotors is 1, i refers to the direction of the resultant force generated by the left and right eccentric rotors, i=1 and 4 respectively represent the clockwise resultant force generated by the left and right eccentric rotors, i=2 and 3 respectively represent the counterclockwise resultant force generated by the left and right eccentric rotors, is the circumferential excitation eccentricity, , is the torsional excitation frequency; In vertical Direction, according to the linear vibration excitation force , so that the vibrating hammer body vibrates up and down; in the circumferential direction Direction, generating torsional excitation through double or multiple pairs of eccentric rotors By controlling the phase angle, the upper and lower centrifugal forces are offset, so that the vibrating hammer generates a total torsional torque. ; Establish a cylindrical coordinate system, the bottom of the vibrating hammer and the top of the pile are connected by a fixed constraint, the vibration hammer motion and excitation are transmitted through the coupling part, the pile and the vibrating hammer realize two-dimensional power drive to achieve two types of vibration forms, and transmit linear vibration excitation force and torsional torque , Represents the torsional moment transmitted at the connection between the vibrating hammer and the pile; Step 2: Establish the premise assumptions of pile-soil elastic-plastic dynamic equation; 1) Under small strain conditions, the stress-strain relationship of the soil is expressed by a linear elastic model; 2) Non-cohesive soil is considered as a linear elastic material; According to the above assumptions, a two-dimensional dynamic driven vibration pile driving method based on the pile-soil friction redistribution mechanism is given: the torsional moment and vertical harmonic load generated by the vibrating hammer act on the pile together. According to the analysis of the torsional vibration force and vertical vibration force of the pile, the torsional vibration and vertical vibration of the pile are solved respectively. The vertical vibration of the pile is solved by the separation of variables method according to the boundary conditions at both ends of the pile. The vertical vibration of the pile is solved according to the R-K45 method. According to the friction interaction between the pile and the soil, the pile is subjected to a torsional excitation and a vertical excitation to the soil. According to the boundary conditions of the soil, the integral transformation method is used to solve the soil response. According to the mechanism of friction redistribution between the pile and the soil and the difference between the torsional and vertical responses between the pile and the soil, the circumferential friction and the vertical friction are calculated respectively. Step 3, establishing the dynamic equation of the two-dimensional power-driven decoupling arrangement high-efficiency and environmentally friendly vibratory pile hammer; In the process of establishing the pile-soil elastic-plastic dynamic equation, the stress-strain relationship of soil under cyclic load has two major characteristics: nonlinearity and hysteresis. A power function nonlinear dynamic model is used as the bone line equation to reflect the nonlinear relationship of soil under dynamic load. On this basis, the bone line equation is constructed into a nonlinear hysteresis curve according to Masing's double method. When establishing the vertical drive model of a two-dimensional power-driven decoupled high-efficiency and environmentally friendly vibratory pile hammer, the direct connection between the vibratory hammer and the pile ensures that the vibratory hammer-pile system has the same motion trajectory. Based on the dynamics of pile-soil interaction, a cubic nonlinear hyperbolic hysteresis model of the vertical motion of the pile is established considering the elastic-plastic properties of the soil. The relationship between the soil restoring force and displacement is taken as follows: (2) ； in, is the linear elastic stiffness coefficient of the soil at the bottom of the pile, is the maximum amplitude of the vertical displacement of the pile, is the nonlinear coefficient of the soil reaction at the bottom of the pile, is the maximum value of the restoring force; is a sign function, z represents the vertical direction; (3) ； The dynamic equation of the vertical vibration of the pile is: (4) ； In formula (4), is the total effective vibrating mass, is the vertical viscous damping coefficient of the soil, is the vertical friction resistance between pile and soil. According to formulas (2) and (3), (5) ； , , , , , , , is the natural frequency of the soil under the pile, is the damping ratio; Substituting the introduced variables and formula (5) into formula (4), we can obtain: (6) ； The above formula is dimensionless, so we get , , , ; Substituting Equation (5) into Equation (6), the dimensionless dynamic equation of the cubic nonlinear hyperbolic hysteresis model of the dynamic foundation system is obtained: (7) ； in, ; (8) ； is the vertical relative displacement of the pile, is the dimensionless restoring force, which is the dimensionless restoring force hyperbolic constitutive relation of the dynamic equation of the vertical vibration of the pile; the soil restoring force-displacement relationship is modeled as the cubic nonlinear hyperbolic hysteresis model of the soil, and R-K45 is introduced to solve the nonlinear equation (7); Due to the increased torsional vibration, the pile-soil contact surface experiences circumferential relative motion. Due to the properties of the soil, there is interaction between the soil and the vibrating hammer-pile system, resulting in circumferential frictional resistance in the pile, the magnitude of which is determined by the properties of the soil and the depth. Based on the forces and boundary conditions of the vibrating hammer and the pile, the motion equations of the two are established respectively. Assuming the vibrating hammer is a rigid body, the circumferential differential equation for the force analysis of the vibrating hammer is established as follows: (9) ； The vibrating hammer has a solution of the form: (10) ； is the moment of inertia of the vibrating hammer, From the initial state The constant that determines Depend on The constant that determines is the undamped natural frequency, , is the natural frequency of damped vibration, is the torsional damping coefficient between pile and soil, is the torsional spring coefficient between pile and soil, is the forced vibration amplitude, , represents the phase difference; Assuming the pile is an elastic rod, the torsional vibration wave equation of the pile is established: (11) ； The boundary conditions of the pile are: (12) ； It is the frictional resistance torque generated by the mutual movement between the outside and inside of the pile and the soil. is the length parameter of the pile; The torsional vibration solution of the pile is obtained by separation of variables method; (13) ； in, is the density of the pile, is the torsional wave velocity of the pile, is the shear modulus of the pile, is the polar moment of inertia of the pile; by solving equation (11) using the separation of variables method, the coefficients are obtained by combining equations (11), (12) and (13) and coefficients ; When the vibrating hammer-pile is torsionally vibrating, the torsional moment formula of the pile at different positions is: as follows: (14) ； in, , is the torsional vibration period; the shear stress of the pile at different positions is solved as the pile torsional vibrates ; (15) ； is the torsional section coefficient of the pile; Step 4, establish soil dynamics equation; During the pile sinking process, the frictional resistance torque is generated by the mutual movement between the outside and inside of the pile and the soil. The annular cross-section at the bottom of the pile generates a circular vertical simple harmonic excitation force on the soil. The stress waves generated by the linear vibration excitation force and the torsional torque cause the vertical and circumferential motion of the soil. The vertical and torsional excitations are integrally transformed using the Fourier-Bessel function. After introducing the soil wave equation, the soil wave equation is solved using the Green function to obtain the vertical response, torsional response, and radial response of the soil under the two excitations. The wave equation of soil in cylindrical coordinates is established as follows: (16) ； is the soil excitation vector, 、 、 Represents the soil in The soil is excited in the direction of The direction of the excitation, the soil The direction is motivated; ； ； ； ； ； is the Lamé constant of soil, is the shear modulus of soil; Perform a forward Fourier-Bessel transform on the excitation source and soil response; (17) ； (18) ； The corresponding inverse Fourier-Bessel transform is as follows; (19) ； (20) ； , 、 、 Represents the soil in The displacement response of the soil in the direction The displacement response of the soil in the direction Displacement response in direction; is an integrating factor, is the cylindrical coordinate axis direction, It's about The matrix, is a Bessel function of the first kind of order n, is the wave number, is the azimuth matrix; In formulas (17), (18), (19) and (20), ； ； ； Is an indicator used to determine 、 、 The value of is used when the load is vertical excitation The first row of matrix elements and n=0, when the load is a torsional load around the vertical axis, it is necessary to use The second row matrix element n=0; is a Bessel function of the first kind of order n, yes First-order derivative; is a diagonal matrix; when the vertical load is about When axisymmetric, , when the load is a torsional load about the vertical axis, ; In the cylindrical coordinate system, the wave equation of the soil is as follows: (21) ； is the soil response matrix; The wave equation of soil in the frequency-wavenumber domain is as follows: (22) ； 、 、 They are the soil in the frequency-wavenumber domain The response of the soil in the frequency-wavenumber domain The response of the soil in the frequency-wavenumber domain Response in direction, 、 、 They are the soil in the frequency-wavenumber domain Directional excitation, soil in the frequency-wave number domain Directional excitation, soil in the frequency-wave number domain Incentives under direction; Formula (22) is separated into two uncoupled equations, where the P-wave is a pair of coupled two-degree-of-freedom equations and the S-wave is a single-degree-of-freedom equation. The specific forms of the two equations are as follows: (23) ； (24) ； Consider a total thickness of The uniform medium has a free upper surface and a fixed lower surface. And the radius is The frequency of torsional excitation is The harmonic torsional load and vertical excitation frequency are The harmonic vertical load of ; taking the upper surface as the coordinate origin, the circumferential load and vertical load are expressed as follows: (25) ； When harmonic torsional loads and harmonic vertical loads are applied to the soil, a torsional resistance torque is generated. The torsional resistance torque is Not related to The shaft is antisymmetric; the Fourier-Bessel transforms of the harmonic torsional load and the harmonic vertical load are as follows: (26) ； Equations (23) and (24) with respect to degrees of freedom 、 and is decoupled; in the frequency-wavenumber domain, the soil wave equation is reformulated as follows: (27) ； (28) ； The horizontal wave number is recorded as ; To solve equations (27) and (28), consider the boundary conditions and the homogeneous problem and divide it by the shear modulus ; To distinguish specific cases, the solution of soil response is expressed as The wave equation and boundary conditions of the soil are as follows: (29) ； , represents the P wave velocity; represents the S wave speed; represents the P-wave characteristic value, Represents the S-wave characteristic value; according to the boundary conditions , for soil and wave number The corresponding normal diffusion mode is, Satisfies the eigenvalue equation and , according to the mode superposition, the wave diffusion problem is solved and the displacement is expressed as the superposition of normal modes; the solution of the annular load is obtained according to the Hankel transformation; (30) ； (31) ； is the depth at which the soil is excited, It's the soil The j-order mode in the direction, is the radius of action of the torsional excitation, is the j-order mode of soil in the z direction, The square of the j-order eigenvalue of soil; Step 5, redistribution of friction force at the pile-soil interface; Due to the increase in torsional torque, the pile generates torsional vibration. When the pile vibrates torsionally, the direction of the friction force at the pile-soil interface changes. The friction force is no longer along the axial direction of the pile, but is opposite to the direction of the velocity at the infinitesimal point on the pile surface. When the velocity and friction force are vector-decomposed into the axial and circumferential directions of the pile, the friction force along the axial direction of the pile is less than the total friction force at the pile-soil interface, thereby reducing the axial friction force at the pile-soil interface. Under the same excitation force or impact load, the penetration speed and depth of the pile are increased. Pile-soil interaction is affected by the friction interface description, friction cycle accumulation and elastic-plastic soil response model; friction resistance according to the Mohr-Coulomb criterion It's about depth The specific formula is as follows: (32) ； is the friction between the inner wall of the pile and the soil, is the friction between the pile outer wall and the soil, is the contact area between the inner wall of the pile and the soil, is the contact area between the pile outer wall and the soil, is the pile-soil interaction friction angle, is the viscosity of the soil; is the earth pressure coefficient, is the effective deadweight of soil; The circumferential friction resistance moment along the pile-soil interface is given by the following formula: (33) ； and They are the contact area between the inner wall of the pile and the soil, and the contact area between the outer wall of the pile and the soil; is the internal friction angle of the soil, and are the friction torque at the inner wall and the friction torque at the outer wall of the pile respectively; The absolute velocity of movement between pile and soil determines the distribution of friction between pile and soil. , soil displacement , the speed of the pile , the speed of soil ; The relative velocity difference between pile and soil is expressed as follows: (34) ； (35) ； is the total relative velocity between pile and soil, Between pile and soil Relative speed in direction, Between pile and soil Relative speed in direction; According to the velocity vector decomposition principle (35), the friction force distribution law at the pile-soil friction interface is obtained as follows: (36) ； Among them, the circumferential friction resistance , axial friction resistance ; According to formula (36), the velocity vector determines the distribution of friction force, and the velocity vector is determined by the ratio of the torsional vibration excitation frequency to the vertical excitation frequency. ; Considering the limit of shear stress that the pile can withstand, the vibration frequency ratio is selected to maximize the effect of two-dimensional power-driven vibration pile driving.

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