Method for installing tower column steel bar sections on tower

Abstract

The invention provides a tower column reinforcing steel bar section on-tower installation method which comprises the steps that a pre-constructed first reinforcing steel bar section is lifted to a preset height away from the ground through a lifting appliance, and the top lifting point of the lifting appliance is adjusted to coincide with the projection of the gravity center of the first reinforcing steel bar section on the ground; the first reinforcing steel bar section is lifted to the position above the poured second reinforcing steel bar section of the tower column through a lifting appliance; a plumb line is drawn on a positioning steel plate arranged at the top of the first reinforcing steel bar section along the first mark position, so that the downward drawing plumb line is aligned with a second mark position arranged on the top surface of the hydraulic creeping formwork of the second reinforcing steel bar section, and the first reinforcing steel bar section is lowered; when the first reinforcing steel bar section is in contact with the second reinforcing steel bar section, the pre-marked main reinforcing steel bars are connected, and the stiff framework stand columns in the first reinforcing steel bar section and the second reinforcing steel bar section are connected; and other main reinforcements are connected, and horizontal stirrups at the butt joint positions of the first reinforcing steel bar sections and the second reinforcing steel bar sections are installed. According to the invention, the accuracy of connecting the steel bar sections on the tower can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of bridge construction, and in particular to a method for installing a tower column steel bar segment on a tower. Background Art

[0002] In the existing technology, the steel bar construction of reinforced concrete tower columns adopts the method of manual in-situ single-bar binding. This method requires a large number of people to cooperate with each other, has high safety risks, small working space, and low positioning accuracy of steel bar construction. It is difficult to supervise the construction, has high quality control requirements, and the construction progress is slow. With the development of technology, reinforced concrete tower columns adopt the method of overall hoisting and component construction of tower column steel bar segments. This method uses a rigid skeleton on the ground to tie the steel bars of the tower column segments, and then hoists the entire steel bar segment into the tower to achieve docking, converting high-altitude work to ground work, eliminating some high-altitude construction work, and reducing safety risks. However, this method makes it difficult to ensure the accuracy of splicing between steel bar segments, resulting in poor construction quality of the tower column. Summary of the Invention

[0003] The present disclosure aims to provide a tower column steel bar segment installation method on a tower, which is conducive to improving the accuracy of connecting the steel bar segments on the tower and improving the construction quality of the tower column.

[0004] In order to achieve the above objectives, the present disclosure provides the following technical solutions: The present disclosure provides a method for installing a tower column steel bar segment on a tower, comprising: Lifting the prefabricated first steel bar segment from the ground to a preset height using a hoist, and adjusting the top lifting point of the hoist to coincide with the projection of the center of gravity of the first steel bar segment on the ground; Lifting the first steel bar segment to above the cast second steel bar segment of the tower column by the lifting device; Pull a plumb line along the first marked position on the positioning steel plate provided on the top of the first steel bar segment, align the plumb line with the second marked position arranged on the top surface of the hydraulic climbing formwork of the second steel bar segment, and lower the first steel bar segment; When the first steel bar segment contacts the second steel bar segment, connecting the pre-marked main bars and connecting the first steel bar segment to the rigid skeleton column in the second steel bar segment; Connect other main reinforcements and install horizontal stirrups at the joint position between the first reinforcement segment and the second reinforcement segment.

[0005] In a feasible embodiment, the horizontal stirrups at the bottom of the first steel bar segment within a preset first height range are not installed on the ground; And / or, the horizontal stirrups at the top of the first reinforcement segment and the second reinforcement segment within a preset second height range are not installed on the ground.

[0006] In a feasible embodiment, during the ground installation of the first steel bar segment, the positioning steel plate extending outward is arranged at the parallel corner point of the rigid frame, and the first marking position marks the top concrete corner point of the first steel bar segment on the positioning steel plate.

[0007] In a feasible embodiment, when the first steel bar segment is assembled on the ground, the bottom of the main reinforcement is not connected to the rigid frame, so that fine adjustment can be performed when the first steel bar segment is connected to the second steel bar segment.

[0008] In a feasible embodiment, the pre-marked main ribs include main ribs located at four corner points.

[0009] In a feasible embodiment, the method of lifting a prefabricated first steel bar segment by a hoist to a preset height above the ground and adjusting the top lifting point of the hoist to coincide with the projection of the center of gravity of the first steel bar segment on the ground includes: The prefabricated first steel bar segment is lifted from the ground to a preset height by a lifting device and left to stand for a preset time; Measuring the height difference at the hanging point of the first steel bar segment and adjusting the height difference to be within a preset range; The top lifting point of the sling is adjusted to coincide with the projection of the center of gravity of the first steel bar segment on the ground.

[0010] In a feasible embodiment, before drawing a plumb line along the first marked position on the positioning steel plate provided on the top of the first steel bar segment, the method further comprises: The position of the first steel bar segment is adjusted by tension components respectively provided on the top of the corner points of the first steel bar segment.

[0011] In a feasible embodiment, lowering the first steel bar segment includes: During the process of lowering the first steel bar segment, the plane position of the first steel bar segment is checked by a total station.

[0012] In a feasible embodiment, the total station is installed on the top of the second steel bar segment or the hydraulic climbing formwork.

[0013] In a feasible embodiment, the connecting of other main reinforcement bars includes: The main reinforcements other than the pre-marked main reinforcements are connected by a cone sleeve locking connection method.

[0014] Compared with the prior art, the solution disclosed in the present invention has the following beneficial effects: the embodiment of the present invention provides a tower column steel bar segment installation method, specifically, the pre-constructed first steel bar segment can be lifted from the ground to a preset height by a hoist, and on this basis, the top lifting point of the hoist is adjusted to coincide with the projection of the center of gravity of the first steel bar segment on the ground, so that the steel bar segment can maintain a relatively stable posture during the lifting process, which is conducive to reducing the shaking caused by the offset of the lifting point, and can effectively prevent the steel bar segment from tilting during the lifting process, thereby avoiding the problems of steel bar deformation, uneven force on the hoist or lifting failure caused by tilting, and improving the lifting accuracy; then, the first steel bar segment can be lifted by the hoist to above the second steel bar segment that has been cast in the tower column, where the first steel bar segment is at a distance of 100 meters from the ground. It is close to the second steel bar segment, but the two are not yet connected. Then, a plumb line can be pulled along the first mark position on the positioning steel plate set on the top of the first steel bar segment, and the lowered plumb line is aligned with the second mark position on the top surface of the hydraulic climbing formwork of the second steel bar segment to ensure the precise positioning of the full-section steel bars of the tower column. Then, the first steel bar segment is lowered. When the first steel bar segment contacts the second steel bar segment, the pre-marked main bars can be connected first to achieve a preliminary connection between the steel bar segments, and the first steel bar segment can be connected to the rigid skeleton column in the second steel bar segment. Then, other main bars can be connected, and horizontal stirrups can be installed at the docking position of the first steel bar segment and the second steel bar segment to achieve precise connection of the steel bar segments on the tower and improve the construction quality of the tower column.

[0015] Additional aspects and advantages of the present disclosure will be set forth in part in the following description, will become apparent from the following description, or may be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 A flow chart of a method for installing a tower column reinforcement segment on a tower provided by an embodiment of the present disclosure; Figure 2 A schematic diagram of the structure of a tower column steel bar segment hoisting according to an embodiment of the present disclosure; Figure 3 A schematic diagram of a cross-sectional structure of a first steel bar segment provided in an embodiment of the present disclosure; Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the positioning steel bar part; Figure 5 A schematic diagram of the structure after installing horizontal stirrups provided in an embodiment of the present disclosure.

[0017] Description of Figure Numbers: 10-first steel bar segment, 11-positioning steel plate, 12-first marking position, 13-plumb line, 14-rigid skeleton, 15-main reinforcement; 20-second steel bar segment; 30-hanging device; 40-hydraulic climbing formwork, 41-second marking position; 01-horizontal stirrups. DETAILED DESCRIPTION

[0018] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure.

[0019] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0020] As used herein, the term "including" and its variations are open-ended, meaning "including but not limited to." The term "connected" may refer to a direct connection or an indirect connection via intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; and the term "some embodiments" means "at least some embodiments." Other terms are defined below.

[0021] It should be noted that the concepts of "first" and "second" mentioned in the present invention are only used to distinguish devices, modules or units, and are not used to limit these devices, modules or units to be different devices, modules or units, nor are they used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0022] The following combination Figures 1 to 5 The method for installing the tower column reinforcement segment on the tower provided by the embodiment of the present disclosure is described in detail.

[0023] Specifically, if Figure 1 As shown, the method provided in the embodiment of the present disclosure includes S101 to S105: S101 , hoisting a prefabricated first steel bar segment 10 above the ground at a preset height using a hoist 30 , and adjusting the top hoisting point of the hoist 30 to coincide with the projection of the center of gravity of the first steel bar segment 10 on the ground.

[0024] S102 , using the lifting device 30 , hoist the first steel bar segment 10 to above the cast second steel bar segment 20 of the tower column.

[0025] S103. Pull a plumb line 13 along the first marked position 12 on the positioning steel plate 11 set on the top of the first steel bar segment 10, align the pulled-down plumb line 13 with the second marked position 41 arranged on the top surface of the hydraulic climbing formwork 40 of the second steel bar segment 20, and lower the first steel bar segment 10.

[0026] S104 , when the first steel bar segment 10 contacts the second steel bar segment 20 , connect the pre-marked main bars 15 , and connect the first steel bar segment 10 to the rigid skeleton 14 columns in the second steel bar segment 20 .

[0027] S105 , connect the other main reinforcements 15 , and install the horizontal stirrups 01 at the joint position between the first reinforcement segment 10 and the second reinforcement segment 20 .

[0028] Optionally, during the construction of the tower column, the tower column is divided into multiple segments, and the steel bars of each segment are pre-fabricated on the ground and hoisted onto the tower column by a hoist 30 to be assembled with other cast segments. The first steel bar segment 10 can be a segment pre-fabricated on the ground and ready for hoisting.

[0029] Optionally, during hoisting, after the pre-constructed first steel bar segment 10 is lifted to a preset height from the ground by the hoist 30, the top lifting point of the hoist 30 and the center of gravity of the first steel bar segment 10 can be adjusted so that their projections on the ground coincide. When the top lifting point of the sling 30 coincides with the projection of the center of gravity of the first steel bar segment 10 on the ground, the first steel bar segment 10 will maintain a relatively stable posture during the lifting process, reducing the shaking caused by the offset of the lifting point. At the same time, the coincidence of the lifting point and the center of gravity projection can prevent the first steel bar segment 10 from tilting during the lifting process, avoiding the problems of steel bar deformation, uneven force on the sling 30 or lifting failure caused by tilting; in addition, during the lifting of the tower segment steel bars, the first steel bar segment 10 needs to be accurately placed in the predetermined position. When the lifting point coincides with the center of gravity projection, the moving trajectory and final position of the first steel bar segment 10 can be more easily controlled, thereby improving the lifting accuracy. The coincidence of the lifting point and the center of gravity projection can also effectively reduce the phenomenon of uneven force during the lifting process, effectively reduce the risk of wear and damage of the sling 30, and extend the service life of the sling 30.

[0030] Optionally, after adjusting the top lifting point of the sling 30 to coincide with the projection of the center of gravity of the first steel bar segment 10 on the ground, the first steel bar segment 10 can be lifted by the sling 30 to the top of the second steel bar segment 20 cast in the tower column, as shown in FIG. Figure 2 In this state, the first steel bar segment 10 can be paused, left to stand, and then slowly lowered after it stabilizes, so as to eliminate the shaking and instability factors that may occur during the lifting process, avoid the first steel bar segment 10 from being misaligned or colliding during docking, and ensure the accuracy and safety of docking.

[0031] Optionally, during the slow lowering of the first steel bar segment 10, as Figure 2 As shown, a plumb line 13 can be drawn along the first marking position 12 on the positioning steel plate 11 set on the top of the first steel bar segment 10, so that the plumb line 13 is aligned with the second marking position 41 (as shown in FIG. Figure 2 The first and second rebar segments 10 and 20 are aligned as shown in the figure (if the error does not exceed the set threshold value X, X can be set according to actual conditions). By pulling down the plumb line 13, the first mark position 12, and the second mark position 41, the relative position relationship between the first rebar segment 10 and the second rebar segment 20 can be intuitively observed, ensuring that the first rebar segment 10 is accurately docked with the second rebar segment 20 in both the vertical and horizontal directions, thereby improving the lifting accuracy.

[0032] Optionally, the positioning steel plate welded on the top of the formwork of the hydraulic climbing formwork 40 can be used to pre-mark the edge position of the corner point of the top tower of the next segment through calculation. When the segments are connected, the plumb line 13 is aligned with the marked point (such as the second marked position 41), which means that the tower column segment steel bars have been accurately positioned.

[0033] In one example, the positioning steel plate 11 is laid out during the pre-construction process of the first steel segment 10. For example, during the installation of the first steel segment 10 on the ground, the positioning steel plate 11 extending outward is laid out at the parallel corner point of the rigid frame 14, and the first marking position 12 marks the top concrete corner point of the first steel segment 10 on the positioning steel plate 11, such as Figure 3 and Figure 4 shown.

[0034] Optionally, when the first steel bar segment 10 and the second steel bar segment 20 come into contact, the pre-marked main bars 15 can be connected first. The pre-marked main bars 15 can include the main bars 15 located at the four corner points, enabling quick and accurate initial docking of the main bars 15, providing a relatively accurate foundation for subsequent comprehensive connection, and ensuring the accuracy and integrity of the main bars 15 in spatial position. Subsequently, the first steel bar segment 10 can be connected to the rigid frame 14 columns in the second steel bar segment 20, such as by full welding, to provide relatively reliable connection strength, so that the first steel bar segment 10 and the second steel bar segment 20 form a stable whole through the rigid frame 14 columns, thereby enhancing the load-bearing capacity and stability of the tower column.

[0035] Optionally, in addition to the secure connection of the rigid frame 14, the tower column main reinforcement 15 can be connected to further enhance the overall structural strength of the tower column. For example, a taper sleeve locking connection can be used when connecting the tower column main reinforcement 15 to ensure the firmness and stability of the main reinforcement 15 connection, allowing the main reinforcement 15 to effectively transmit tension and compression, ensuring the safety of the tower column under various loads.

[0036] In one example, a cone-sleeve locking connection was used to connect all main bars 15 except for the pre-marked bars 15. This is a type of extruded cone-sleeve locking rebar joint technology. The rebar to be connected is inserted into the locking plate's six-section, centered and tightened against the retaining frame. The cone-sleeves are then inserted into both ends of the locking plate. The two cone-sleeves are then axially compressed, and the locking plate clamps the rebar using the self-locking principle of the cone angle to achieve the rebar connection. This cone-sleeve locking connection effectively ensures joint strength and stability.

[0037] For example, the pre-marked main reinforcement 15 can also be connected by a taper sleeve locking connection method.

[0038] Optionally, after the main reinforcement 15 is connected, the horizontal stirrup 01 at the joint position between the first reinforcement segment 10 and the second reinforcement segment 20 is installed, such as Figure 5 As shown in the figure, the horizontal stirrups 01 and the main bars 15 can together form a reinforcement skeleton.

[0039] For example, the horizontal stirrups 01 at the bottom of the first steel bar segment 10 within a preset first height range are not installed on the ground, and / or the horizontal stirrups 01 at the top of the first steel bar segment 10 and the second steel bar segment 20 within a preset second height range are not installed on the ground. In one example, the first height and the second height can be the same or different. To facilitate construction personnel operation, they can be set to 1.5 meters. This height can be adjusted according to actual conditions and is not limited in this embodiment of the present disclosure.

[0040] In the disclosed embodiment, the horizontal stirrups 01 within the preset height range are installed when the steel bar segments are installed on the tower column, which is beneficial to reducing the obstacles of hoisting and facilitating the docking of the steel bar segments. Assuming that after all the horizontal stirrups 01 are installed on the ground, the space at the docking position of the steel bar segments will be occupied by the horizontal stirrups 01, making it difficult to dock the main bars 15. Installing the horizontal stirrups 01 at the docking position in the final operation of docking and installing the steel bar segments can provide sufficient space for the docking operation and improve the docking quality and efficiency. In addition, when installing the horizontal stirrups 01 on the ground, installation errors are prone to occur due to the uneven ground. When installing the horizontal stirrups 01 on the tower column, it can be accurately adjusted according to the second steel bar segment 20 and the actual situation on site, reducing errors and ensuring the overall positioning accuracy of the steel bar skeleton; and installing the horizontal stirrups 01 at the docking position on the tower column is beneficial to reducing the hoisting weight and improving the safety and stability of the hoisting process.

[0041] In a feasible embodiment, when the first steel segment 10 is assembled on the ground, the bottom of the main bar 15 is not connected to the rigid frame 14, so that fine-tuning can be performed when the first steel segment 10 is connected to the second steel segment 20, eliminating the error generated when the first steel segment 10 is assembled on the ground and improving the precision of the connection between the two segments. In addition, considering the variable conditions at the construction site, such as foundation settlement, formwork deformation, etc., when the first steel segment 10 and the second steel segment 20 are connected, the actual situation may be different from the expectation of the steel segments assembled on the ground. By not connecting the bottom of the main bar 15 to the rigid frame 14, but connecting them when connecting on the tower, the position of the first steel segment 10 can be fine-tuned according to the actual situation on the site, so that it can better adapt to the changes on the site and improve the connection accuracy between the segments. That is, when assembled on the ground, the bottom of the main bar 15 is not connected to the rigid frame 14, so that it can be flexibly adjusted according to the actual situation when the segments are connected, which is conducive to ensuring the efficiency and quality of construction.

[0042] In a feasible embodiment, in S101, the prefabricated first steel bar segment 10 is lifted off the ground to a preset height by a lifting device 30, and the top lifting point of the lifting device 30 is adjusted to coincide with the projection of the center of gravity of the first steel bar segment 10 on the ground, including steps A1 to A3: Step A1: Use the lifting device 30 to lift the prefabricated first steel bar segment 10 from the ground to a preset height and leave it for a preset time.

[0043] Step A2: Measure the height difference at the hanging point of the first steel bar segment 10, and adjust the height difference to be within a preset range.

[0044] Step A3: Adjust the top lifting point of the sling 30 to coincide with the projection of the center of gravity of the first steel bar segment 10 on the ground.

[0045] Optionally, the first steel bar segment 10 can be adjusted to a preset height from the ground by the hoist 30, such as 10 cm (this height can be adjusted according to actual conditions and is not limited to this in the embodiment of the present disclosure), and left to stand at this height for a preset time. During this process, construction personnel can check the posture of the first steel bar segment 10 in the air, and measure the height difference at the hanging point of the first steel bar segment 10, and adjust the height difference within a preset range to ensure the accuracy of the assembly of the first steel bar segment 10 on the ground and the stability of the hoisting.

[0046] For example, the lifting points of the first steel bar segment 10 can be four corner points. By adjusting the height difference of the four corner points, the top of the first steel bar segment 10 can be placed on a similar horizontal plane, ensuring the stability of the lifting process and effectively avoiding deformation caused by lifting.

[0047] In a feasible embodiment, before S103 draws the plumb line 13 along the first marked position 12 on the positioning steel plate 11 set on the top of the first steel bar segment 10, it also includes step B1: adjusting the position of the first steel bar segment 10 by respectively setting the tension components on the top of the corner points of the first steel bar segment 10.

[0048] Optionally, the tension component can be a steel wire rope. During the docking process of the first steel bar segment 10, the position of the first steel bar segment 10 can be fine-tuned by the tension component to ensure that the first steel bar segment 10 can be accurately aligned with the corresponding position of the second steel bar segment 20, thereby improving the docking accuracy and reducing subsequent construction problems caused by position deviation. The assistance of the sling 30 and the steel wire rope is conducive to improving the efficiency and accuracy of lifting and docking.

[0049] In a feasible embodiment, lowering the first steel bar segment 10 in S103 includes step C1: during the process of lowering the first steel bar segment 10 , verifying the plane position of the first steel bar segment 10 by using a total station.

[0050] Optionally, a total station is a high-precision measuring instrument that can accurately measure the planar position of the rebar segments. It can be installed on top of the second rebar segment 20 or the hydraulic climbing formwork 40. Verification with the total station can further confirm the accuracy of the position of the first rebar segment 10, ensuring construction accuracy and effectively guaranteeing the stability of the overall tower structure.

[0051] The above description is only part of the embodiments of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present disclosure. These improvements and modifications should also be regarded as within the scope of protection of the present disclosure.

Claims

1. A tower column steel bar segment installation method, characterized in that: Lifting the prefabricated first steel bar segment from the ground to a preset height using a hoist, and adjusting the top lifting point of the hoist to coincide with the projection of the center of gravity of the first steel bar segment on the ground; Lifting the first steel bar segment to above the cast second steel bar segment of the tower column by the lifting device; Pull a plumb line along the first marked position on the positioning steel plate provided on the top of the first steel bar segment, align the plumb line with the second marked position arranged on the top surface of the hydraulic climbing formwork of the second steel bar segment, and lower the first steel bar segment; When the first steel bar segment contacts the second steel bar segment, connecting the pre-marked main bars and connecting the first steel bar segment to the rigid skeleton column in the second steel bar segment; Connect other main reinforcements and install horizontal stirrups at the joint position between the first reinforcement segment and the second reinforcement segment.

2. The tower column steel bar segment installation method according to claim 1, characterized in that: The horizontal stirrups at the bottom of the first steel bar segment within a preset first height range are not installed on the ground; And / or, the horizontal stirrups at the top of the first reinforcement segment and the second reinforcement segment within a preset second height range are not installed on the ground.

3. The tower column reinforcement segment installation method according to claim 1, characterized in that: During the ground installation of the first steel bar segment, the positioning steel plate extending outward is arranged at the parallel corner point of the rigid frame, and the first marking position marks the top concrete corner point of the first steel bar segment on the positioning steel plate.

4. The tower column reinforcement segment installation method according to claim 1, characterized in that: When the first steel bar segment is assembled on the ground, the bottom of the main bar is not connected to the rigid frame, so that fine adjustment can be performed when the first steel bar segment is connected to the second steel bar segment.

5. The tower column reinforcement segment installation method according to claim 1, characterized in that: The pre-marked main reinforcements include main reinforcements located at four corner points.

6. The tower column reinforcement segment installation method according to claim 1, characterized in that: The method comprises: lifting a prefabricated first steel bar segment by a hoist to a preset height above the ground; and adjusting a top lifting point of the hoist to coincide with a projection of a center of gravity of the first steel bar segment on the ground. The prefabricated first steel bar segment is lifted from the ground to a preset height by a lifting device and left to stand for a preset time; Measuring the height difference at the hanging point of the first steel bar segment and adjusting the height difference to be within a preset range; The top lifting point of the sling is adjusted to coincide with the projection of the center of gravity of the first steel bar segment on the ground.

7. The tower column reinforcement segment installation method according to claim 1, characterized in that: Before drawing a plumb line along the first marked position on the positioning steel plate provided on the top of the first steel bar segment, the method further comprises: The position of the first steel bar segment is adjusted by tension components respectively provided on the top of the corner points of the first steel bar segment.

8. The tower column reinforcement segment installation method according to claim 1, characterized in that: The step of lowering the first steel bar segment comprises: During the process of lowering the first steel bar segment, the plane position of the first steel bar segment is checked by a total station.

9. The method for installing a column reinforcement segment on a tower according to claim 8, wherein: The total station is installed on the top of the second steel bar segment or the hydraulic climbing formwork.

10. The tower column reinforcement segment installation method according to claim 1, characterized in that: The connection of other main reinforcements includes: The main reinforcements other than the pre-marked main reinforcements are connected by a cone sleeve locking connection method.

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