Photovoltaic support end pile supporting structure and method

Abstract

The invention discloses a photovoltaic support end pile supporting structure and method.The supporting structure comprises a stand column, a movable terminal, a base, an embedded part and a prefabricated pipe pile, one end of the movable terminal is connected with the stand column, the other end of the movable terminal is connected with one end of the base, and the other end of the base is connected with the prefabricated pipe pile through the embedded part. When strong shock occurs in the environment, the elastic piece B system can effectively reduce the impact between the movable terminal and the base, a certain buffer area is formed, the shock of the main cable is indirectly reduced, and the safety of the flexible support system is improved. When strong wind occurs in the environment, the elastic pieces A on the left and right sides of the movable terminal can avoid stress concentration of the movable terminal, and loss caused by the wind swing effect of the stand column is reduced. When the main cable or the stay cable on the end pile and the stay cable under the end pile are loose or the pre-stress is insufficient, the elastic piece C can limit the stand column I from inclining, and the stay cable or the main cable is prevented from being damaged due to overlarge local stress.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic equipment, and in particular relates to a photovoltaic bracket end pile support structure and method. Background Art

[0002] In recent years, photovoltaic power generation, as a green energy source, has promoted the efficient, safe and quality development of new energy with its safe and stable support structure. At present, photovoltaic power generation mainly consists of fixed supports, flexible supports, rotating shaft supports, etc., especially the flexible support system can effectively save land and improve land utilization rate. However, the flexible support end pile structure generally has the disadvantages of low safety, poor wind resistance and poor shock absorption effect, which seriously threatens the safety of photovoltaic power generation system. Therefore, it is necessary to invent a safe and wind-resistant and shock-absorbing support structure.

[0003] In addition, once the flexible support end pile has safety problems, it is usually because the column is damaged or the support rigidity is too large and the elasticity is poor, resulting in local stress concentration when subjected to strong winds or strong earthquakes, which leads to damage. This not only causes serious safety and quality problems, but also greatly increases the cost of maintenance or remediation.

[0004] The patent document with announcement number CN117988378A discloses a method for connecting a migrated photovoltaic bracket to a prefabricated pipe pile foundation. Specifically, after the photovoltaic bracket with anchor bolts on the concrete pile is relocated, the original photovoltaic bracket is migrated to the prefabricated pipe pile foundation. The connection method uses welded screws on the connecting plate as the connecting parts between the photovoltaic bracket and the end plate instead of the pre-embedded grouting process of the pipe pile core. The specific process is to inspect the pipe pile foundation - lay out the connecting plate - install the connecting plate - install the column of the photovoltaic bracket - install the photovoltaic bracket - fix the connecting plate - touch up the paint.

[0005] The patent document with announcement number CN217629860U discloses a flexible bracket end anchoring system, including an end pile, the lower end of which is fixedly arranged, and the upper end of which is provided with a pulling seat; at least one pre-buried pile; at least one inclined cable, the lower end of which is cast and connected to the pre-buried pile, and the upper end of which is connected to the pulling seat. The lower end of the inclined cable passes through the pre-buried rivet plate and is connected to the first rivet to pull the lower end of the inclined cable; the pre-buried rivet plate is located in the cement column of the pre-buried pile. The upper end of the inclined cable passes through the vertical plate and the inclined rivet plate and is riveted to the second rivet to pull the upper end of the inclined cable.

[0006] The bottom connection of the column or end pile of the above patent has no elastic structure, which cannot absorb vibration and thus reduce the vibration of the upper end of the bracket, and cannot reduce the loss caused by the wind swing effect of the column. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a photovoltaic bracket end pile support structure and method.

[0008] The present invention is achieved through the following technical solutions.

[0009] The present invention provides a photovoltaic bracket end pile support structure, which includes a column, a movable terminal, a base, an embedded part and a prefabricated pipe pile, wherein one end of the movable terminal is connected to the column, the other end of the movable terminal is connected to one end of the base, and the other end of the base is connected to the prefabricated pipe pile through the embedded part.

[0010] Preferably, the column is cylindrical, and screw holes A and screw holes B are respectively provided on the base and the embedded part. Bolts A and bolts B are provided on the base. The bolt A passes through the screw hole A of the base and is threadedly connected to the screw hole A on the embedded part. The bolt B passes through the screw hole B on the base and is threadedly connected to the screw hole B on the embedded part.

[0011] Preferably, an elastic member C is provided on the base, one end of the elastic member C is connected to the bolt B, and the other end of the elastic member C is connected to the column.

[0012] Preferably, a groove A and an elastic member A are provided on the base, the movable terminal extends into the groove A and is connected to the base via a bolt A, one end of the elastic member A is connected to the groove A, and the other end of the elastic member A is connected to the movable terminal.

[0013] Preferably, a groove B is arranged at the bottom of the groove A, an elastic member B is arranged in the groove B, a placement plate is arranged on the elastic member B, and the movable terminal is arranged on the placement plate.

[0014] Preferably, the main cable channel, the end pile inclined plate hole A and the end pile inclined plate hole B are arranged on the column from top to bottom in sequence, the main cable channel, the end pile inclined plate hole A and the end pile inclined plate hole B are all circular, a hole A is arranged at the bottom of the column, and a bolt B is arranged on the hole A.

[0015] Preferably, the embedded part is made of steel, and comprises a connecting part and a supporting part, the top of the connecting part is connected to the supporting part, the connecting part is connected to the prefabricated pipe pile, and the supporting part is connected to the base.

[0016] Preferably, a hole A is provided on the movable terminal, and the movable terminal is made of steel.

[0017] A method for installing a photovoltaic bracket end pile support structure comprises the following steps:

[0018] T1: Prepare materials according to construction requirements;

[0019] T2: Produce prefabricated pipe piles and bury embedded parts in the pile heads of prefabricated pipe piles;

[0020] T3: Locate and mark the end points of the photovoltaic support;

[0021] T4: Drill holes in advance and drive prefabricated pipe piles into the soil until the required depth is reached;

[0022] T5: Place the base on the embedded parts, and fasten the base to the embedded parts through bolts A and B, so that the base, embedded parts and prefabricated pipe piles are connected as a whole;

[0023] T6: Weld one end of the elastic member A to the inner wall of the groove A, weld the lower end of the elastic member B to the bottom of the groove B, and weld the upper end of the elastic member B to the bottom of the placement plate;

[0024] T7: Place the movable terminal on the placement plate, connect and tighten the movable terminal to the base with bolt A, then weld the other end of the elastic member A to the movable terminal, and connect one end of the elastic member C to bolt B;

[0025] T8: Place the column at the corresponding position on the top of the movable terminal, connect and tighten the column to the movable terminal with bolt B, and connect the other end of the elastic member C to the column;

[0026] T9: Check whether the installation position, accuracy, elevation, etc. of each part meet the requirements.

[0027] Preferably, according to the existing basic formula:

[0028]

[0029] Where:

[0030] τ i : is the allowable shear stress of the spring;

[0031] f i : is the maximum elastic deformation of the spring; K i : Spring stiffness coefficient; U i : is the deformation energy performance of the spring;

[0032] J i : is the spring curvature coefficient;

[0033] D i : is the spring middle diameter;

[0034] P i : Maximum spring force;

[0035] d i : is the spring material diameter;

[0036] n i : is the effective number of coils of the spring;

[0037] The design formula of the elastic member B is:

[0038]

[0039] The design formula of the elastic member A is:

[0040]

[0041] The design formula of the elastic member C is:

[0042]

[0043] Among them, P1 is the maximum vertical pressure exerted on the base by a single main cable and column, P2 is the maximum horizontal force of the left and right winds on the supporting structure, and P3 is the maximum horizontal force of the front and rear winds on the supporting structure;

[0044] m1 is the number of elastic parts B, K1 is the stiffness coefficient of elastic part B, d1 is the material diameter of elastic part B, D1 is the median diameter of elastic part B, C1 is the winding ratio of elastic part B, G1 is the shear modulus of the material of elastic part B, n1 is the effective number of turns of elastic part B, f1 is the maximum elastic deformation of elastic part B, τ1 is the allowable shear stress of elastic part B, and J1 is the spring curvature coefficient of elastic part B;

[0045] m2 is the number of elastic parts A, K2 is the stiffness coefficient of elastic part A, d2 is the material diameter of elastic part A, D2 is the median diameter of elastic part A, C2 is the winding ratio of elastic part A, G2 is the shear modulus of the material of elastic part A, n2 is the effective number of turns of elastic part A, f2 is the maximum elastic deformation of elastic part A, τ2 is the allowable shear stress of elastic part A, and J2 is the curvature coefficient of elastic part A;

[0046] m3 is the number of elastic parts C, K3 is the stiffness coefficient of elastic part C, d3 is the material diameter of elastic part C, D3 is the spring middle diameter of elastic part C, C3 is the winding ratio of elastic part C, G3 is the shear modulus of the material of elastic part C, n3 is the effective number of turns of elastic part C, θ is the angle between elastic part C and the column, f3 is the maximum elastic deformation of elastic part C, τ3 is the allowable shear stress of elastic part C, and J3 is the curvature coefficient of elastic part C.

[0047] The beneficial effects of the present invention are:

[0048] The present invention can effectively improve the stability and safety of the end pile support of the flexible bracket through the setting of the elastic member. Among them, when a strong earthquake occurs in the environment, the system setting of the elastic member B can effectively reduce the impact between the movable terminal and the base, form a certain buffer zone, and indirectly reduce the vibration of the main cable, improve the safety of the flexible bracket system, and reduce losses. When strong winds appear in the environment, the elastic member A begins to work, and the elastic members A on the left and right sides of the movable terminal bear tension on one side and pressure on the other side, effectively improving the left and right flexibility of the support structure, avoiding stress concentration on the movable terminal, and reducing the loss caused by the wind swing effect of the column. When the main cable or the upper inclined cable of the end pile, and the lower inclined cable of the end pile are loose or the prestress is insufficient, the elastic member C begins to work, and the elastic member C will limit the tilt of the column I to prevent the inclined cable or the main cable from being damaged by excessive local force. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a front view of the present invention;

[0050] Figure 2 It is a left side view of the present invention;

[0051] Figure 3 is a top view of the present invention;

[0052] Figure 4 It is a structural schematic diagram of the column of the present invention;

[0053] Figure 5 It is a structural schematic diagram of the base of the present invention;

[0054] Figure 6 It is a structural schematic diagram of the movable terminal of the present invention;

[0055] Figure 7 It is a structural schematic diagram of the embedded part of the present invention;

[0056] Figure 8 AA is a schematic cross-sectional view of the embedded part of the present invention;

[0057] Fig. 9 yes Figure 7 A top view of

[0058] Fig.10 is a flow chart of the installation method of the present invention;

[0059] In the figure: Ⅰ-column, Ⅱ-movable terminal, Ⅲ-base, Ⅳ-embedded parts, Ⅴ-prefabricated pipe pile, 1-main cable channel, 2-end pile inclined plate hole A, 3-end pile inclined plate hole B, 4-bolt B, 5-elastic part A, 6-bolt A, 7-elastic part C, 8-elastic part B, 9-bolt A, 10-bolt B, 11-screw hole A, 12-screw hole B, 13-hole A, 14-placing plate, 101-groove A, 102-groove B, 201-connecting part, 202-supporting part. DETAILED DESCRIPTION

[0060] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0061] Example:

[0062] like Figures 1 to 10 As shown, a photovoltaic bracket end pile support structure includes a column I, a movable terminal II, a base III, an embedded part IV and a prefabricated pipe pile V, one end of the movable terminal II is connected to the column I, the other end of the movable terminal II is connected to one end of the base III, and the other end of the base III is connected to the prefabricated pipe pile V through the embedded part IV.

[0063] The column I is cylindrical, and screw holes A11 and screw holes B12 are respectively provided on the base III and the embedded part IV. Bolts A9 and bolts B10 are provided on the base III. The bolt A9 penetrates the screw hole A11 of the base III and is threadedly connected with the screw hole A11 on the embedded part IV. The bolt B10 penetrates the screw hole B12 on the base III and is threadedly connected with the screw hole B12 on the embedded part IV.

[0064] An elastic member C7 is disposed on the base III, one end of the elastic member C7 is connected to the bolt B10, and the other end of the elastic member C7 is connected to the column I.

[0065] The base III is provided with a groove A101 and an elastic member A5, the movable terminal II extends into the groove A101 and is connected to the base III via a bolt A6, one end of the elastic member A5 is connected to the groove A101, and the other end of the elastic member A5 is connected to the movable terminal II.

[0066] A groove B102 is arranged at the bottom of the groove A101 , an elastic member B8 is arranged in the groove B102 , a placement plate 14 is arranged on the elastic member B8 , and the movable terminal II is arranged on the placement plate 14 .

[0067] The main cable hole 1, the end pile inclined plate hole A2 and the end pile inclined plate hole B3 are arranged on the column I from top to bottom, the main cable hole 1, the end pile inclined plate hole A2 and the end pile inclined plate hole B3 are all circular, and a hole A13 is arranged at the bottom of the column I, and a bolt B4 is arranged on the hole A13. The column I is connected to the main cable of the photovoltaic support through the main cable hole 1, and is connected to the inclined cable of the photovoltaic support through the end pile inclined plate hole A2 and the end pile inclined plate hole B3.

[0068] The embedded part IV is made of steel and includes a connecting part 201 and a supporting part 202. The top of the connecting part 201 is connected to the supporting part 202. The connecting part 201 is connected to the prefabricated pipe pile V, and the supporting part 202 is connected to the base III.

[0069] The movable terminal II is provided with a hole A13, and the movable terminal II is made of steel. The bolt B4 passes through the hole A13 of the column I and the hole A13 of the support portion 202 in sequence, so that the column I and the movable terminal II are connected and fastened.

[0070] A method for installing a photovoltaic bracket end pile support structure comprises the following steps:

[0071] T1: Prepare materials according to construction requirements;

[0072] T2: produce prefabricated pipe pile V, and bury embedded part IV in the pile head of prefabricated pipe pile V;

[0073] T3: Locate and mark the end points of the photovoltaic support;

[0074] T4: Drill the hole in advance and use the pile driver to drive the prefabricated pipe pile V into the soil until it reaches the required depth;

[0075] T5: Place the base III on the embedded part IV, and fasten the base III to the embedded part IV through bolts A9 and bolts B10, so that the base III is connected to the embedded part IV and the prefabricated pipe pile V as a whole;

[0076] T6: Weld one end of the elastic member A5 to the inner wall of the groove A101, weld the lower end of the elastic member B8 to the bottom of the groove B102, and weld the upper end of the elastic member B8 to the bottom of the placement plate 14;

[0077] T7: Place the movable terminal II on the placement plate 14, connect and fasten the movable terminal II to the base III with the bolt A6, then weld the other end of the elastic member A5 to the movable terminal II, and connect one end of the elastic member C7 to the bolt B10;

[0078] T8: Place column I at the corresponding position on the top of movable terminal II, connect column I and movable terminal II with bolt B4, and connect the other end of elastic member C7 to column I, so that column I and base III are connected as a whole;

[0079] T9: Check whether the installation position, accuracy, elevation, etc. of each part meet the requirements.

[0080] According to the existing basic formula:

[0081]

[0082] Where:

[0083] τ i : is the allowable shear stress of the spring;

[0084] f i : is the maximum elastic deformation of the spring;

[0085] K i : spring stiffness coefficient;

[0086] U i : is the deformation energy performance of the spring;

[0087] J i : is the spring curvature coefficient;

[0088] D i : is the spring middle diameter;

[0089] P i : Maximum spring force;

[0090] d i : is the spring material diameter;

[0091] n i : is the effective number of coils of the spring;

[0092] In order to ensure the shock absorption and pressure resistance of the structure, the following regulations are made: when designing the elastic part B8, the effect of the bolts and the elastic part A5 on the movable terminal is not considered, the maximum vertical pressure is borne entirely by the elastic part B8, and the most unfavorable state is that the deformation of the spring is the maximum deformation of the spring elasticity.

[0093] In order to ensure that the structure can resist the left and right horizontal wind pressure and maintain the safety of the structure, the following provisions are made: when designing the elastic part A5, the maximum left and right horizontal pressures are all borne by the elastic part A5, and the most unfavorable state is that the deformation of the spring is the maximum deformation of the spring elasticity.

[0094] In order to ensure the stability of the main cables and columns of the structure and prevent the columns from tilting forward and backward, the following regulations are made: when designing the elastic member A5, the maximum front and rear horizontal tension is entirely borne by the elastic member C7, and the most unfavorable state is that the deformation of the spring is the maximum deformation of the spring elasticity.

[0095] The design formula of the elastic member B8 is:

[0096]

[0097] The design formula of the elastic member A5 is:

[0098]

[0099] The design formula of the elastic member C7 is:

[0100]

[0101] Among them, P1 is the maximum vertical pressure exerted by a single main cable and column I on base III, P2 is the maximum horizontal force of the left and right winds on the supporting structure, and P3 is the maximum horizontal force of the front and rear winds on the supporting structure;

[0102] m1 is the number of elastic parts B8, K1 is the stiffness coefficient of elastic parts B8, d1 is the material diameter of elastic parts B8, D1 is the median diameter of elastic parts B8, C1 is the winding ratio of elastic parts B8, G1 is the shear modulus of the material of elastic parts B8, n1 is the effective number of turns of elastic parts B8, f1 is the maximum elastic deformation of elastic parts B8, τ1 is the allowable shear stress of elastic parts B8, and J1 is the spring curvature coefficient of elastic parts B8;

[0103] m2 is the number of elastic parts A5, K2 is the stiffness coefficient of elastic part A5, d2 is the material diameter of elastic part A5, D2 is the median diameter of elastic part A5, C2 is the winding ratio of elastic part A5, G2 is the shear modulus of the material of elastic part A5, n2 is the effective number of turns of elastic part A5, f2 is the maximum elastic deformation of elastic part A5, τ2 is the allowable shear stress of elastic part A5, and J2 is the curvature coefficient of elastic part A5;

[0104] m3 is the number of elastic parts C7, K3 is the stiffness coefficient of elastic part C7, d3 is the material diameter of elastic part C7, D3 is the spring middle diameter of elastic part C7, C3 is the winding ratio of elastic part C7, G3 is the shear modulus of the material of elastic part C7, n3 is the effective number of turns of elastic part C7, θ is the angle between elastic part C7 and column I, f3 is the maximum elastic deformation of elastic part C7, τ3 is the allowable shear stress of elastic part C7, and J3 is the curvature coefficient of elastic part C7.

[0105] The maximum vertical pressure is P1, the maximum horizontal force of wind is P2, and the maximum front and rear horizontal force is P3, which can be calculated through wind resistance grade test or simulation software. The allowable shear stress τ1~τ3, spring stiffness coefficient K1~K3, spring curvature coefficient J1~J3, shear modulus G1~G3, and maximum elastic deformation f1~f3 are determined by the material itself and its properties. The winding ratio C1~C3 is given when designing the spring structure.

Claims

1. A photovoltaic bracket end pile support structure, characterized in that: The utility model comprises a column (I), a movable terminal (II), a base (III), an embedded part (IV) and a prefabricated pipe pile (V), wherein one end of the movable terminal (II) is connected to the column (I), the other end of the movable terminal (II) is connected to one end of the base (III), and the other end of the base (III) is connected to the prefabricated pipe pile (V) through the embedded part (IV).

2. A photovoltaic bracket end pile support structure as claimed in claim 1, characterized in that: The column (I) is cylindrical, and the base (III) and the embedded part (IV) are respectively provided with a screw hole A (11) and a screw hole B (12). The base (III) is provided with a bolt A (9) and a bolt B (10). The bolt A (9) passes through the screw hole A (11) of the base (III) and is threadedly connected to the screw hole A (11) on the embedded part (IV). The bolt B (10) passes through the screw hole B (12) on the base (III) and is threadedly connected to the screw hole B (12) on the embedded part (IV).

3. A photovoltaic bracket end pile support structure as claimed in claim 2, characterized in that: An elastic member C (7) is arranged on the base (III), one end of the elastic member C (7) is connected to the bolt B (10), and the other end of the elastic member C (7) is connected to the column (I).

4. A photovoltaic bracket end pile support structure as claimed in claim 1, characterized in that: The base (III) is provided with a groove A (101) and an elastic member A (5); the movable terminal (II) extends into the groove A (101) and is connected to the base (III) via a bolt A (6); one end of the elastic member A (5) is connected to the groove A (101), and the other end of the elastic member A (5) is connected to the movable terminal (II).

5. A photovoltaic bracket end pile support structure as claimed in claim 4, characterized in that: A groove B (102) is arranged at the bottom of the groove A (101), an elastic member B (8) is arranged in the groove B (102), a placement plate (14) is arranged on the elastic member B (8), and the movable terminal (II) is arranged on the placement plate (14).

6. A photovoltaic bracket end pile support structure as claimed in claim 1, characterized in that: The column (Ⅰ) is provided with a main cable hole (1), an end pile inclined plate hole A (2) and an end pile inclined plate hole B (3) in sequence from top to bottom. The main cable hole (1), the end pile inclined plate hole A (2) and the end pile inclined plate hole B (3) are all circular. A hole A (13) is provided at the bottom of the column (Ⅰ), and a bolt B (4) is provided on the hole A (13).

7. A photovoltaic bracket end pile support structure as claimed in claim 1, characterized in that: The embedded part (IV) is made of steel and comprises a connecting part (201) and a supporting part (202). The top of the connecting part (201) is connected to the supporting part (202). The connecting part (201) is connected to the prefabricated pipe pile (V), and the supporting part (202) is connected to the base (III).

8. A photovoltaic support end pile support structure as claimed in claim 1, characterized in that: The movable terminal (II) is provided with a hole A (13), and the movable terminal (II) is made of steel.

9. A method for installing a photovoltaic support end pile support structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: T1: Prepare materials according to construction requirements; T2: producing prefabricated pipe piles (V), and burying embedded parts (IV) at the pile heads of the prefabricated pipe piles (V); T3: Locate and mark the end points of the photovoltaic support; T4: Drill holes in advance and drive prefabricated pipe piles (V) into the soil until the required depth is reached; T5: Place the base (III) on the embedded part (IV), and fasten the base (III) and the embedded part (IV) with bolts A (9) and bolts B (10), so that the base (III) and the embedded part (IV) and the prefabricated pipe pile (V) are connected as a whole; T6: Weld one end of the elastic member A (5) to the inner wall of the groove A (101), weld the lower end of the elastic member B (8) to the bottom of the groove B (102), and weld the upper end of the elastic member B (8) to the bottom of the placement plate (14); T7: Place the movable terminal (II) on the placement plate (14), connect and tighten the movable terminal (II) to the base (III) with the bolt A (6), then weld the other end of the elastic member A (5) to the movable terminal (II), and connect one end of the elastic member C (7) to the bolt B (10); T8: Place the column (Ⅰ) at the corresponding position on the top of the movable terminal (Ⅱ), connect and tighten the column (Ⅰ) and the movable terminal (Ⅱ) with the bolt B (4), and connect the other end of the elastic member C (7) to the column (Ⅰ); T9: Check whether the installation position, accuracy, elevation, etc. of each part meet the requirements.

10. A method for installing a photovoltaic support end pile support structure according to claim 9, characterized in that: According to the existing basic formula: Where: τ i : is the allowable shear stress of the spring; f i : is the maximum elastic deformation of the spring; K i : spring stiffness coefficient; U i : is the deformation energy performance of the spring; J i : is the spring curvature coefficient; D i : is the spring middle diameter; P i : Maximum spring force; d i : is the spring material diameter; n i : is the effective number of coils of the spring; The design formula of the elastic member B (8) is: The design formula of the elastic member A (5) is: The design formula of the elastic member C (7) is: Among them, P1 is the maximum vertical pressure exerted by a single main cable and column (Ⅰ) on the base (Ⅲ), P2 is the maximum horizontal force of the left and right winds on the supporting structure, and P3 is the maximum horizontal force of the front and rear winds on the supporting structure; m1 is the number of elastic parts B(8), K1 is the stiffness coefficient of elastic part B(8), d1 is the material diameter of elastic part B(8), D1 is the median diameter of elastic part B(8), C1 is the winding ratio of elastic part B(8), G1 is the shear modulus of the material of elastic part B(8), n1 is the effective number of turns of elastic part B(8), f1 is the maximum elastic deformation of elastic part B(8), τ1 is the allowable shear stress of elastic part B(8), and J1 is the spring curvature coefficient of elastic part B(8); m2 is the number of elastic parts A(5), K2 is the stiffness coefficient of the elastic part A(5), d2 is the material diameter of the elastic part A(5), D2 is the median diameter of the elastic part A(5), C2 is the winding ratio of the elastic part A(5), G2 is the shear modulus of the material of the elastic part A(5), n2 is the effective number of turns of the elastic part A(5), f2 is the maximum elastic deformation of the elastic part A(5), τ2 is the allowable shear stress of the elastic part A(5), and J2 is the curvature coefficient of the elastic part A(5); m3 is the number of elastic parts C(7), K3 is the stiffness coefficient of the elastic part C(7), d3 is the material diameter of the elastic part C(7), D3 is the spring middle diameter of the elastic part C(7), C3 is the winding ratio of the elastic part C(7), G3 is the shear modulus of the material of the elastic part C(7), n3 is the effective number of turns of the elastic part C(7), θ is the angle between the elastic part C(7) and the column (Ⅰ), f3 is the maximum elastic deformation of the elastic part C(7), τ3 is the allowable shear stress of the elastic part C(7), and J3 is the curvature coefficient of the elastic part C(7).

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