Steel pipe hoisting construction method for steel pipe pile

Abstract

The invention relates to the field of steel pipe hoisting construction methods for steel pipe piles, in particular to a steel pipe hoisting construction method for steel pipe piles. A steel pipe hoisting construction method for a steel pipe pile comprises the steps that S1, a first main hoisting assembly and one end of the steel pipe pile extend into a through hole, and the first main hoisting assembly and the steel pipe pile are fixed; the second main hoisting assembly is fixed to the other end of the steel pipe pile; s2, the steel pipe pile is hoisted to a preset position, a first main hoisting assembly is lifted, one end of the steel pipe pile is driven to be lifted, and the steel pipe pile is moved from the transverse direction to the vertical direction; and S3, the first main lifting assembly is separated from the upper end of the steel pipe pile through the auxiliary lifting assembly. According to the steel pipe hoisting construction method for the steel pipe pile, the purpose that the first main hoisting assembly on the upper portion of the steel pipe pile is separated from the steel pipe pile is achieved, only through holes need to be formed in one end of the steel pipe pile in the whole process, lifting lugs do not need to be arranged on the outer side of the steel pipe pile, and therefore interference between the lifting lugs and outer hoop equipment is avoided; and the influence on downward movement of the steel pipe pile in the lifting process is reduced.

Description

Technical Field

[0001] The invention relates to the field of steel pipe hoisting construction methods for steel pipe piles, and in particular to a steel pipe hoisting construction method for steel pipe piles. Background Art

[0002] At present, in the construction process of high-pile docks, it is necessary to construct steel pipe piles, that is, the two ends of the steel pipe placed horizontally on the ground are respectively connected to the steel wire rope of the hoist, and then the hoist is lifted by the crane to make the steel pipe pile vertical, and then it is lifted to the construction position and placed vertically on the piling equipment (pile driver or piling ship), and the piling equipment clamps it from the outside and impacts it downward.

[0003] In the above process, since the piling equipment clamps the steel pipe piles externally, it is best to avoid welding lifting ears on the outside of the steel pipe piles to prevent the lifting ears from interfering with the external clamping equipment and affecting the downward movement of the steel pipe piles.

[0004] At the same time, in the above process, how to separate the steel wire rope on the upper part of the steel pipe pile from the steel pipe pile after the steel pipe pile is vertically placed on the piling equipment has become a technical problem that needs to be solved in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem in the background technology that during the steel pipe lifting process, when no lifting lugs are provided on the outside of the steel pipe, the steel wire rope on the upper part of the steel pipe cannot be separated from the steel pipe, and to provide a steel pipe lifting construction method for steel pipe piles.

[0006] In a first aspect, the present invention provides a steel pipe hoisting construction method for steel pipe piles, comprising: The first main hanging assembly, the second main hanging assembly and the auxiliary hanging assembly, one end of the steel pipe is provided with through holes arranged opposite to each other; The construction method comprises the following steps: S1. Extend one end of the first main hanging assembly close to the steel pipe into the through hole and fix it with the auxiliary hanging assembly inside the steel pipe, so that the first main hanging assembly is fixed to the steel pipe; fix the second main hanging assembly to the other end of the steel pipe; S2. The steel pipe is hoisted to a predetermined position by the first main hoisting assembly and the second main hoisting assembly, wherein the first main hoisting assembly is lifted, which drives one end of the steel pipe to be lifted, and the steel pipe is moved from horizontal to vertical; S3. Using the auxiliary hanging assembly to separate the first main hanging assembly from the upper end of the steel pipe.

[0007] The present application describes a steel pipe lifting construction method for steel pipe piles, which lifts the steel pipe to a predetermined position by means of the first main lifting assembly and the second main lifting assembly, and then uses the auxiliary lifting assembly to separate the first main lifting assembly from the upper end of the steel pipe, thereby achieving the purpose of separating the first main lifting assembly on the upper part of the steel pipe from the steel pipe without manual labor, and the entire process only requires setting a through hole at one end of the steel pipe, and does not require setting a lifting ear on the outside of the steel pipe, thereby avoiding interference between the lifting ear and the outer hoop equipment, and reducing the impact of the lifting process on the downward movement of the steel pipe.

[0008] Preferably, the through hole on one side of the steel pipe is a first through hole, and the through hole on the other side is a second through hole.

[0009] Preferably, the first main lifting assembly includes a first lifting rope, and the lower part of the first lifting rope is respectively connected to a first sub-lifting rope and a second sub-lifting rope, the first sub-lifting rope is provided with a first lifting ring and a second lifting ring at one end away from the first lifting rope, and the second sub-lifting rope is provided with a third lifting ring at one end away from the first lifting rope, the first lifting ring and the second lifting ring can be extended into the first through hole, and the third lifting ring can be extended into the second through hole.

[0010] Preferably, the auxiliary lifting assembly includes a second lifting rope, a pin is connected to the end of the second lifting rope, the pin can pass through the first lifting ring, the second lifting ring and the third lifting ring, and can lock the third lifting ring between the first lifting ring and the second lifting ring when the first sub-lifting rope and the second sub-lifting rope are tensioned, and when the second lifting rope applies tension to the pin, the pin can detach from the first lifting ring, the second lifting ring and the third lifting ring.

[0011] Preferably, the step S1 comprises the following steps: S11. Extending the first and second lifting rings into the first through hole, and extending the third lifting ring into the second through hole; S12. The third lifting ring is disposed between the first lifting ring and the second lifting ring; S13. The pin passes through the first lifting ring, the third lifting ring and the second lifting ring in sequence; S14. Tighten the first sub-hanging rope and the second sub-hanging rope so that one side of the pin shaft is pressed against the first lifting ring and the second lifting ring, and the other side of the pin shaft is pressed against the third lifting ring.

[0012] When one side of the pin shaft is squeezed with the first lifting ring and the second lifting ring and the other side of the pin shaft is squeezed with the third lifting ring, it can effectively ensure that the pin shaft does not separate from the first lifting ring, the second lifting ring and the third lifting ring during the lifting process, thereby ensuring the construction safety of the lifting process.

[0013] Preferably, step S3 comprises the following steps: S31. The first and second lifting ropes are in a relaxed state; S32. Raise the auxiliary hanging assembly so that the second hanging rope drives the pin to move upward, and the pin is separated from the first hanging ring, the second hanging ring and the third hanging ring until the pin is hung out of the steel pipe; S33. Lift the first main lifting assembly, and pull the first lifting ring and the second lifting ring out of the first through hole, and pull the third lifting ring out of the second through hole.

[0014] The whole process is simple, without complicated mechanical or electrical control structures, and the construction is simple and convenient, effectively reducing construction costs.

[0015] Preferably, the pin extends from the end of the steel pipe into the steel pipe.

[0016] Preferably, the pin shaft is provided with a first inner recess matched with the first hanging ring.

[0017] Preferably, the pin shaft is provided with a second inner recess matched with the second lifting ring. Preferably, the pin shaft is provided with a third inner recess matched with the third lifting ring.

[0018] Preferably, the pin shaft includes a shaft body, one end of the shaft body along the axial direction is connected to the second lifting rope, and the other end of the shaft body along the axial direction is connected to an shaft end structure, and the shaft end structure can pass through the first lifting ring, the second lifting ring and the third lifting ring, and at least one side of the shaft end structure protrudes radially from the shaft body along the pin shaft.

[0019] During the lifting process, the first sub-lifting rope and the second sub-lifting rope are tensioned, one side of the pin shaft is squeezed with the first lifting ring and the second lifting ring, and the other side of the pin shaft is squeezed with the third lifting ring. In this case, at least one side of the shaft end structure protrudes radially from the shaft body along the pin shaft, which can further ensure that the pin shaft does not separate from the first lifting ring, the second lifting ring and the third lifting ring during the lifting process, thereby ensuring the construction safety of the lifting process.

[0020] Preferably, the shaft end structure is a frustum structure, and the small end of the shaft end structure is threadedly connected to the shaft body.

[0021] Preferably, the shaft end structure can be elastically deformed along the axial direction of the shaft body.

[0022] Compared with the prior art, the present invention has the following beneficial effects: The present application describes a steel pipe lifting construction method for steel pipe piles, which lifts the steel pipe pile to a predetermined position by means of the first main lifting assembly and the second main lifting assembly, and then uses the auxiliary lifting assembly to separate the first main lifting assembly from the upper end of the steel pipe pile, thereby achieving the purpose of separating the first main lifting assembly on the upper part of the steel pipe pile from the steel pipe pile, and the entire process only requires the provision of a through hole at one end of the steel pipe pile, and does not require the provision of a lifting ear on the outside of the steel pipe pile, thereby avoiding interference between the lifting ear and the outer hoop equipment, and reducing the impact of the lifting process on the downward movement of the steel pipe pile. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is a schematic diagram of the coordination of a first main lifting component and an auxiliary lifting component in a steel pipe lifting construction method for steel pipe piles of the present application.

[0023] Figure 2 This is a right view schematic diagram of the cooperation between the first main lifting component and the auxiliary lifting component of a steel pipe lifting construction method for steel pipe piles in the present application.

[0024] Figure 3 For this application Figure 2 Enlarged schematic diagram of part A in the middle.

[0025] Figure 4 This is a schematic diagram of the pin structure of this application.

[0026] Marking in the figure 1-first main lifting assembly, 11-first lifting rope, 12-first branch lifting rope, 13-second branch lifting rope, 14-third lifting ring, 15-first lifting ring, 16-second lifting ring, 2-auxiliary lifting assembly, 21-second lifting rope, 22-pin shaft, 23-first inner recess, 24-second inner recess, 25-third inner recess, 26-axis body, 27-axis end structure, 3-steel pipe, 30-through hole, 31-first through hole, 32-second through hole, 4-second main lifting assembly; 41-third branch lifting rope; 42-fourth branch lifting rope. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0028] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0030] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0031] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0032] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0033] Example 1 like Figure 1-4 As shown, this embodiment provides a steel pipe hoisting construction method for steel pipe piles, comprising: The first main hanging assembly 1, the second main hanging assembly 4 and the auxiliary hanging assembly 2, one end of the steel pipe 3 is provided with a through hole 30 arranged opposite to each other; The construction method comprises the following steps: S1. Extend one end of the first main hanging component 1 close to the steel pipe 3 into the through hole 30, and fix it with the auxiliary hanging component 2 inside the steel pipe 3, so that the first main hanging component 1 is fixed to the steel pipe 3; fix the second main hanging component 4 to the other end of the steel pipe 3; S2. The steel pipe 3 is hoisted to a predetermined position by the first main hoisting assembly 1 and the second main hoisting assembly 4, wherein the first main hoisting assembly 1 is lifted, driving one end of the steel pipe 3 to be lifted, and the steel pipe 3 is moved from the horizontal direction to the vertical direction, at which time, the auxiliary hoisting assembly 2 is in a relaxed state; S3. Use the auxiliary hanging assembly 2 to separate the first main hanging assembly 1 from the upper end of the steel pipe 3.

[0034] Specifically and preferably, the through hole 30 on one side of the steel pipe 3 is a first through hole 31 , and the through hole 30 on the other side is a second through hole 32 .

[0035] In a preferred manner, the first main lifting component 1 includes a first lifting rope 11, and the lower part of the first lifting rope 11 is respectively connected to a first branch lifting rope 12 and a second branch lifting rope 13, the first branch lifting rope 12 is provided with a first lifting ring 15 and a second lifting ring 16 at one end away from the first lifting rope 11, and the second branch lifting rope 13 is provided with a third lifting ring 14 at one end away from the first lifting rope 11, the first lifting ring 15 and the second lifting ring 16 can be extended into the first through hole 31, and the third lifting ring 14 can be extended into the second through hole 32.

[0036] The auxiliary lifting assembly 2 includes a second lifting rope 21, and a pin 22 is connected to the end of the second lifting rope 21. The pin 22 can pass through the first lifting ring 15, the second lifting ring 16 and the third lifting ring 14, and can lock the third lifting ring 14 between the first lifting ring 15 and the second lifting ring 16 when the first sub-lifting rope 12 and the second sub-lifting rope 13 are tensioned, and when the second lifting rope 21 applies a pulling force to the pin 22, the pin 22 can be detached from the first lifting ring 15, the second lifting ring 16 and the third lifting ring 14.

[0037] Based on the above solution, step S1 includes the following steps: S11. The first lifting ring 15 and the second lifting ring 16 are extended into the first through hole 31, and the third lifting ring 14 is extended into the second through hole 32; S12. The third lifting ring 14 is disposed between the first lifting ring 15 and the second lifting ring 16; S13. The pin 22 sequentially passes through the first lifting ring 15, the third lifting ring 14 and the second lifting ring 16; S14. Tighten the first sub-hanging rope 12 and the second sub-hanging rope 13 so that one side of the pin 22 is pressed against the first lifting ring 15 and the second lifting ring 16 , and the other side of the pin 22 is pressed against the third lifting ring 14 .

[0038] When one side of the pin 22 is squeezed against the first lifting ring 15 and the second lifting ring 16 and the other side of the pin 22 is squeezed against the third lifting ring 14, it can effectively ensure that the pin 22 does not separate from the first lifting ring 15, the second lifting ring 16 and the third lifting ring 14 during the lifting process, thereby ensuring the construction safety of the lifting process.

[0039] The step S3 comprises the following steps: S31. The first and second lifting ropes 12 and 13 are in a relaxed state; S32. Raise the auxiliary hanging assembly 2 so that the second hanging rope 21 drives the pin 22 to move upward, and the pin 22 is separated from the first hanging ring 15, the second hanging ring 16 and the third hanging ring 14 until the pin 22 hangs out of the steel pipe 3; S33. Lift the first main lifting assembly 1, and pull the first lifting ring 15 and the second lifting ring 16 out of the first through hole 31, and pull the third lifting ring 14 out of the second through hole 32.

[0040] The whole process is simple, without complicated mechanical or electrical control structures, and the construction is simple and convenient, effectively reducing construction costs.

[0041] In a preferred embodiment, the pin shaft 22 extends from the end of the steel pipe 3 into the steel pipe 3 .

[0042] In a preferred manner, the pin shaft 22 is provided with a first inner recess 23 that matches with the first suspension ring 15 .

[0043] In a preferred embodiment, the pin shaft 22 is provided with a second inner recess 24 that matches with the second lifting ring 16. In a preferred embodiment, the pin shaft 22 is provided with a third inner recess 25 which cooperates with the third suspension ring 14 .

[0044] In a preferred manner, the pin shaft 22 includes a shaft body 26, one end of the shaft body 26 along the axial direction is connected to the second lifting rope 21, and the other end of the shaft body 26 along the axial direction is connected to an shaft end structure 27, and the shaft end structure 27 can pass through the first lifting ring 15, the second lifting ring 16 and the third lifting ring 14, and at least one side of the shaft end structure 27 protrudes radially from the shaft body 26 along the pin shaft 22.

[0045] During the lifting process, the first branch lifting rope 12 and the second branch lifting rope 13 are tensioned, one side of the pin 22 is squeezed with the first lifting ring 15 and the second lifting ring 16, and the other side of the pin 22 is squeezed with the third lifting ring 14. In this case, at least one side of the shaft end structure 27 protrudes radially from the shaft body 26 along the pin 22, which can further ensure that the pin 22 does not separate from the first lifting ring 15, the second lifting ring 16 and the third lifting ring 14 during the lifting process, thereby ensuring the construction safety of the lifting process.

[0046] In a preferred manner, the shaft end structure 27 is a frustum structure, and the small end of the shaft end structure 27 is threadedly connected to the shaft body 26 .

[0047] In a preferred manner, the shaft end structure 27 can be elastically deformed along the axial direction of the shaft body 26 .

[0048] In a specific preferred embodiment, the shaft end structure 27 is made of rubber or plastic.

[0049] In a preferred embodiment, the lower part of the second main suspension assembly 4 is connected to a third branch suspension rope 41 and a fourth branch suspension rope 42, and the third branch suspension rope 41 and the fourth branch suspension rope 42 are both wound around the outside of the steel pipe 3, at least three times.

[0050] In a further preferred embodiment, the winding directions of the third sub-lifting rope 41 and the fourth sub-lifting rope 42 are opposite to each other, so as to reduce the swing amplitude of the steel pipe 3 during the lifting process.

[0051] The present embodiment describes a steel pipe lifting construction method for steel pipe piles, in which the steel pipe 3 is lifted to a predetermined position by the first main lifting assembly 1 and the second main lifting assembly 4, and then the first main lifting assembly 1 is separated from the upper end of the steel pipe 3 by the auxiliary lifting assembly 2, thereby achieving the purpose of separating the first main lifting assembly 1 on the upper part of the steel pipe 3 from the steel pipe 3, and the whole process only requires setting a through hole 30 at one end of the steel pipe 3, and does not require setting a lifting ear on the outside of the steel pipe 3, thereby avoiding interference between the lifting ear and the outer hoop equipment, and reducing the influence of the lifting process on the downward movement of the steel pipe 3.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel pipe hoisting construction method for steel pipe piles, characterized in that: include: A first main hanging assembly (1), a second main hanging assembly (4) and an auxiliary hanging assembly (2), one end of the steel pipe (3) is provided with through holes (30) arranged opposite to each other; The construction method comprises the following steps: S1. Extend one end of the first main hanging component (1) close to the steel pipe (3) into the through hole (30), and fix it with the auxiliary hanging component (2) inside the steel pipe (3), so that the first main hanging component (1) is fixed to the steel pipe (3); fix the second main hanging component (4) to the other end of the steel pipe (3); S2. The steel pipe (3) is hoisted to a predetermined position by the first main hoisting assembly (1) and the second main hoisting assembly (4), wherein the first main hoisting assembly (1) is lifted, thereby driving one end of the steel pipe (3) to be lifted, and causing the steel pipe (3) to move from a horizontal position to a vertical position; S3. Using the auxiliary hanging assembly (2) to separate the first main hanging assembly (1) from the upper end of the steel pipe (3).

2. A steel pipe hoisting construction method for steel pipe piles according to claim 1, characterized in that: The through hole (30) on one side of the steel pipe (3) is a first through hole (31), and the through hole (30) on the other side is a second through hole (32); The first main lifting component (1) comprises a first lifting rope (11), the lower part of which is respectively connected to a first sub-lifting rope (12) and a second sub-lifting rope (13), one end of the first sub-lifting rope (12) away from the first lifting rope (11) is provided with a first lifting ring (15) and a second lifting ring (16), and one end of the second sub-lifting rope (13) away from the first lifting rope (11) is provided with a third lifting ring (14), the first lifting ring (15) and the second lifting ring (16) can be inserted into the first through hole (31), and the third lifting ring (14) can be inserted into the second through hole (32); The auxiliary lifting component (2) comprises a second lifting rope (21), the end of which is connected to a pin (22), the pin (22) being capable of passing through a first lifting ring (15), a second lifting ring (16) and a third lifting ring (14), and being capable of locking the third lifting ring (14) between the first lifting ring (15) and the second lifting ring (16) when the first lifting rope (12) and the second lifting rope (13) are tensioned, and when the second lifting rope (21) applies a pulling force to the pin (22), the pin (22) is capable of detaching from the first lifting ring (15), the second lifting ring (16) and the third lifting ring (14).

3. A steel pipe hoisting construction method for steel pipe piles according to claim 2, characterized in that: The step S1 comprises the following steps: S11. Extending the first lifting ring (15) and the second lifting ring (16) into the first through hole (31), and extending the third lifting ring (14) into the second through hole (32); S12. The third lifting ring (14) is disposed between the first lifting ring (15) and the second lifting ring (16); S13. The pin (22) is passed through the first lifting ring (15), the third lifting ring (14) and the second lifting ring (16) in sequence; S14. Tensioning the first lifting rope (12) and the second lifting rope (13) so that one side of the pin (22) is pressed against the first lifting ring (15) and the second lifting ring (16), and the other side of the pin (22) is pressed against the third lifting ring (14); and / or, The step S3 comprises the following steps: S31. The first suspension rope (12) and the second suspension rope (13) are in a relaxed state; S32. Raise the auxiliary lifting assembly (2) so that the second lifting rope (21) drives the pin (22) to move upward, and the pin (22) is separated from the first lifting ring (15), the second lifting ring (16) and the third lifting ring (14), until the pin (22) is lifted out of the steel pipe (3); S33. Lift the first main lifting assembly (1), and pull the first lifting ring (15) and the second lifting ring (16) out of the first through hole (31), and pull the third lifting ring (14) out of the second through hole (32).

4. A steel pipe hoisting construction method for steel pipe piles according to claim 3, characterized in that: The pin shaft (22) extends from the end of the steel pipe (3) into the steel pipe (3).

5. A steel pipe hoisting construction method for steel pipe piles according to claim 3, characterized in that: The pin shaft (22) is provided with a first inner recess (23) that matches the first suspension ring (15); and / or, The pin shaft (22) is provided with a second inner recess (24) which matches with the second lifting ring (16); and / or, The pin shaft (22) is provided with a third inner recess (25) which matches with the third suspension ring (14).

6. A steel pipe hoisting construction method for steel pipe piles according to claim 3, characterized in that: The pin shaft (22) comprises a shaft body (26), one end of the shaft body (26) along the axial direction is connected to the second lifting rope (21), and the other end of the shaft body (26) along the axial direction is connected to an shaft end structure (27), the shaft end structure (27) can pass through the first lifting ring (15), the second lifting ring (16) and the third lifting ring (14), and at least one side of the shaft end structure (27) protrudes radially from the shaft body (26) along the pin shaft (22).

7. A steel pipe hoisting construction method for steel pipe piles according to claim 6, characterized in that: The shaft end structure (27) is a frustum structure, and the small end of the shaft end structure (27) is threadedly connected to the shaft body (26).

8. A steel pipe hoisting construction method for steel pipe piles according to claim 6, characterized in that: The diameter of the small end of the shaft end structure (27) is matched to the diameter of the shaft body (26).

9. A steel pipe hoisting construction method for steel pipe piles according to claim 6, characterized in that: The shaft end structure (27) is capable of elastic deformation along the axial direction of the shaft body (26).

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