Large cantilever beam structure and construction method thereof

Abstract

The invention discloses a large cantilever beam structure and a construction method thereof, and belongs to the technical field of buildings. The large cantilever beam structure comprises a wall body and a cantilever beam body, a fixing block used for installing the cantilever beam body is arranged on the wall body, a fixing block installing groove is formed in the wall body, the fixing end of the fixing block is inserted into the fixing block installing groove, and a rotating block capable of rotating up and down is rotationally connected to the fixing block through a rotating shaft. The cantilever beam main body is fixed on the wall body through the fixing block, so that the area of a broken hole in the wall body can be reduced, and the repairing difficulty of the wall body when the cantilever beam main body is dismounted can be reduced; the rotating block and the cantilever beam body can be connected and fixed only by lifting the steel structure cantilever section of the cantilever beam body, the rotating block is driven to rotate upwards to be horizontal through the traction mechanism after installation is completed, and the construction difficulty of the cantilever beam body is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of construction, and relates to a large cantilever beam structure and a large cantilever beam construction method. Background Art

[0002] In the process of rapid economic development in my country, the development of infrastructure is also progressing day by day. Many high-altitude large cantilever steel structures have appeared in architectural design. The cantilever beam has a novel structure, which can not only meet the needs of architectural aesthetics, but also realize special functions. Therefore, it is becoming more and more popular among people.

[0003] The traditional cantilever frame installation method is to reserve a section of cantilever beam to extend into the room for fixing, then use equipment to lift the entire cantilever beam until it is aligned with the groove on the wall and then insert the cantilever beam. However, due to the overall weight of the cantilever beam, the installation is difficult.

[0004] For example, a Chinese patent discloses a large-span and large-space cantilever beam structure [application number: 201920103798.0], which includes a cantilever beam and a fixed seat. There are two cantilever beams, and the two cantilever beams are connected in the middle by a fixed seat, and one end of one of the cantilever beams is embedded in the wall; the cantilever beam is an I-shaped structure, and the outer wall of the fixed seat is a frame structure, and an expansion plate is provided in the middle of the frame structure of the fixed seat, and the expansion plate divides the fixed seat into two parts, and the cantilever beam and the fixed seat are connected through a locking mechanism. Summary of the invention

[0005] The object of the present invention is to provide a large cantilever beam structure in view of the above problems.

[0006] The purpose of the present invention is to provide a large cantilever beam construction method in view of the above problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A large cantilever beam structure comprises a wall and a cantilever beam body, wherein a fixed block for mounting the cantilever beam body is arranged on the wall, a fixed block mounting groove is opened on the wall, a fixed end of the fixed block is inserted into the fixed block mounting groove, a rotating block which can rotate up and down is rotatably connected to the fixed block via a rotating shaft, a cantilever beam mounting groove is arranged on the rotating block, a steel structure cantilever section of the cantilever beam body is inserted into the cantilever beam mounting groove, and a traction mechanism connected to the rotating block is also arranged on the fixed block.

[0009] In the above-mentioned large cantilever beam structure, the traction mechanism includes a traction seat fixed on the top of the fixed block, a traction wheel driven by a cylinder is arranged in the traction seat, a traction rope is fixedly wound around the traction wheel, a traction block is fixedly connected to the top of the rotating block, and a lifting ring that can be connected to the traction rope is arranged on the traction block.

[0010] In the above-mentioned large cantilever beam structure, the traction seat is detachably fixed to the fixing block by a plurality of bolts, and the end of the lifting ring is screwed to the traction block.

[0011] In the above-mentioned large cantilever beam structure, when the cantilever beam body is in a horizontal state, the positioning portion of the rotating block abuts against the outer end of the fixed block.

[0012] In the above-mentioned large cantilever beam structure, a No. 1 fixing hole is correspondingly provided on the rotating block and the fixed block. When the cantilever beam body is in a horizontal state, the No. 1 fixing holes on the rotating block and the fixed block are aligned with each other, and the rotating block and the fixed block are fixed by passing a pin shaft through the No. 1 fixing hole.

[0013] In the above-mentioned large cantilever beam structure, the cantilever beam body includes a steel structure cantilever section and a concrete cantilever section, and a reinforced connection structure is also provided between the steel structure cantilever section and the rotating block.

[0014] In the above-mentioned large cantilever beam structure, the reinforced connection structure includes an I-shaped connection block protruding from the middle of the cantilever beam installation groove, and the I-shaped connection block is inserted into the cantilever section of the steel structure.

[0015] In the above-mentioned large cantilever beam structure, a plurality of No. 2 fixing holes are correspondingly arranged between the cantilever section of the steel structure and the rotating block, and the rotating block and the cantilever section of the steel structure are fixed by inserting pins in the No. 2 fixing holes.

[0016] In the above-mentioned large cantilever beam structure, a steel frame is arranged in the concrete cantilever section, and the steel frame includes a plurality of No. 1 steel bars arranged along the length direction of the cantilever beam body, and the plurality of No. 1 steel bars are surrounded by a rectangle, and a plurality of connecting grooves corresponding to the No. 1 steel bars are recessed inwardly on the cantilever section of the steel structure, and the No. 1 steel bars are inserted into the connecting grooves, and the connection between the No. 1 steel bars and the connecting grooves is welded and fixed, and also includes a plurality of horizontally arranged No. 2 steel bars and vertically arranged No. 3 steel bars, and the connection between the No. 1 steel bars, the No. 2 steel bars and the No. 3 steel bars is welded and fixed.

[0017] A large cantilever beam construction method using a large cantilever beam structure comprises the following steps:

[0018] Step A: Install the traction seat in the traction mechanism onto the fixed block, install the lifting ring onto the traction block, open a fixed block installation slot on the wall, insert the fixed end of the fixed block into the fixed block installation slot and fix it with expansion screws;

[0019] Step B: prefabricate the steel frame in the steel structure cantilever section and the concrete cantilever section, weld and fix the steel frame to the steel structure cantilever section, and install a panel around the steel frame, with one end of the panel fixed to the steel structure cantilever section and the other end fixed to the tail of the steel frame;

[0020] Step C: Rotate the rotating block until the opening of the cantilever beam installation slot is tilted downward, lift one end of the steel structure cantilever section of the cantilever beam body and insert the steel structure cantilever section into the cantilever beam installation slot, insert the pin into the No. 2 fixing hole to fix the steel structure cantilever section and the rotating block;

[0021] Step D: Pull out the traction rope on the traction sheave in the traction mechanism, fix the traction rope to the lifting ring, drive the traction sheave to rotate through the oil cylinder, and the rotation of the traction sheave can pull the rotating block to rotate upward along the rotating shaft through the traction rope until the rotating block rotates to the point where the positioning part of the rotating block abuts against the outer end of the fixed block, and the cantilever beam body is in a horizontal state, and insert the pin into the No. 1 fixing hole;

[0022] Step E: Pour concrete inside the enclosure. After the concrete solidifies to form a concrete cantilever section, remove the enclosure and the towing seat and lifting ring together.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] 1. Fixing the cantilever beam body to the wall through a fixing block can reduce the area of ​​the hole on the wall, thereby reducing the difficulty of repairing the wall when the cantilever beam body is removed. Secondly, after setting a rotating block that can rotate up and down along the rotating shaft, when the cantilever beam body is installed, it is only necessary to lift the steel structure cantilever section of the cantilever beam body to achieve the connection and fixation of the rotating block and the cantilever beam body. After the installation is completed, the rotating block is driven to rotate upward to a horizontal position through the traction mechanism, which effectively reduces the construction difficulty of the cantilever beam body.

[0025] 2. The oil cylinder can drive the traction sheave to rotate. The rotation of the traction sheave can pull the rotating block to rotate upward along the rotating axis through the traction rope and the lifting ring on the traction block. When installing the cantilever beam body, the rotating block is rotated until the notch of the cantilever beam installation slot on the rotating block is tilted downward, so that when installing the cantilever beam body, it is only necessary to lift the steel structure cantilever section of the cantilever beam body to align with the cantilever beam installation slot, and then insert the steel structure cantilever section into the cantilever beam installation slot at an angle. After the installation is completed, the rotating block is driven to rotate upward to a horizontal level through the traction mechanism.

[0026] 3. This construction method abandons the traditional method of directly inserting the cantilever beam into the wall, which reduces the area of ​​the hole on the wall after removing the cantilever beam and reduces the difficulty of repair after removal. Secondly, when installing the cantilever beam body, the rotating block is rotated until the notch of the cantilever beam installation slot on the rotating block is tilted downward, so that when installing the cantilever beam body, only the steel structure cantilever section of the cantilever beam body needs to be lifted, so that the cantilever beam body can be connected with the rotating block in an inclined state, and the concrete cantilever section is cast on site. The overall weight of the cantilever beam body is small, and it can be installed by manpower with the help of small tools in a small space, and the construction difficulty is low.

[0027] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the cantilever beam when the main body is tilted;

[0029] Figure 2 It is a structural diagram when the main body of the cantilever beam is horizontal;

[0030] Figure 3 It is a cross-sectional view of the concrete cantilever section during concrete pouring;

[0031] Figure 4 It is a structural diagram of the rotating block;

[0032] Figure 5 yes Figure 2 A magnified schematic diagram of center A.

[0033] In the figure, wall 1, cantilever beam body 2, fixed block 3, fixed block mounting groove 4, fixed end 5, rotating block 6, cantilever beam mounting groove 7, steel structure cantilever section 8, traction mechanism 9, traction seat 10, traction sheave 11, traction rope 12, traction block 13, lifting ring 14, positioning part 15, No. 1 fixing hole 16, concrete cantilever section 17, reinforced connecting structure 18, I-shaped connecting block 19, No. 2 fixing hole 20, steel skeleton 21, No. 1 steel bar 22, connecting groove 23, No. 2 steel bar 24, No. 3 steel bar 25, enclosure 26, and rotating shaft 27. DETAILED DESCRIPTION

[0034] like Figure 1-Figure 5As shown, a large cantilever beam structure includes a wall 1 and a cantilever beam body 2, wherein the wall 1 is provided with a fixed block 3 for installing the cantilever beam body 2, the wall 1 is provided with a fixed block mounting groove 4, the fixed end 5 of the fixed block 3 is inserted into the fixed block mounting groove 4, the fixed block 3 is rotatably connected to a rotating block 6 that can rotate up and down through a rotating shaft 27, the rotating block 6 is provided with a cantilever beam mounting groove 7, the steel structure cantilever section 8 of the cantilever beam body 2 is inserted into the cantilever beam mounting groove 7, and the fixed block 3 is also provided with a traction mechanism 9 connected to the rotating block 6.

[0035] In the present invention, fixing the cantilever beam body to the wall through a fixing block can reduce the area of ​​the hole on the wall, thereby reducing the difficulty of repairing the wall when the cantilever beam body is removed. Secondly, after providing a rotating block that can rotate up and down along the rotating shaft, when the cantilever beam body is installed, it is only necessary to lift the steel structure cantilever section of the cantilever beam body to achieve the connection and fixation of the rotating block and the cantilever beam body. After the installation is completed, the rotating block is driven to rotate upward to a horizontal position through a traction mechanism, which effectively reduces the construction difficulty of the cantilever beam body.

[0036] Specifically, the traction mechanism 9 includes a traction seat 10 fixed on the top of the fixed block 3, a traction sheave 11 driven by an oil cylinder is arranged in the traction seat 10, a traction rope 12 is fixedly wound around the traction sheave 11, a traction block 13 is fixedly connected to the top of the rotating block 6, and a lifting ring 14 which can be connected to the traction rope 12 is arranged on the traction block 13. The oil cylinder can drive the traction sheave to rotate, and the rotation of the traction sheave can pull the rotating block to rotate upward along the rotating shaft through the traction rope and the lifting ring on the traction block. When the cantilever beam body is installed, the rotating block is rotated until the notch of the cantilever beam installation slot on the rotating block is tilted downward, so that when the cantilever beam body is installed, only the steel structure cantilever section of the cantilever beam body needs to be lifted to align with the cantilever beam installation slot, and then the steel structure cantilever section is tilted and inserted into the cantilever beam installation slot. After the installation is completed, the traction mechanism drives the rotating block to rotate upward to a horizontal level.

[0037] Preferably, the traction seat 10 is detachably fixed to the fixing block 3 by a plurality of bolts, and the end of the lifting ring 14 is screwed to the traction block 13. After the overall installation of the cantilever beam body is completed, the traction seat can be removed from the fixing block by unscrewing the bolts, and the lifting ring can also be directly unscrewed from the traction block, which does not affect the beauty of the cantilever beam.

[0038] Specifically, when the cantilever beam body 2 is in a horizontal state, the positioning portion 15 of the rotating block 6 abuts against the outer end of the fixed block 3. The cantilever beam body can be positioned by the positioning portion of the rotating block in conjunction with the fixed block to ensure that the cantilever beam body is in a horizontal state after installation.

[0039] Specifically, the rotating block 6 and the fixed block 3 are provided with a No. 1 fixing hole 16, and when the cantilever beam body 2 is in a horizontal state, the No. 1 fixing holes 16 on the rotating block 6 and the fixed block 3 are aligned with each other, and the rotating block 6 and the fixed block 3 are fixed by inserting a pin in the No. 1 fixing hole 16. By inserting a pin in the No. 1 fixing hole, the rotating block and the fixed block can be fixed after the cantilever beam body is in a horizontal state.

[0040] Specifically, the cantilever beam body 2 includes a steel structure cantilever section 8 and a concrete cantilever section 17. A reinforcing connection structure 18 is further provided between the steel structure cantilever section 8 and the rotating block 6. The reinforcing connection structure 18 includes an I-shaped connection block 19 protruding from the middle of the cantilever beam mounting groove 7. The I-shaped connection block 19 is inserted into the steel structure cantilever section 8. The I-shaped connection block 19 can increase the overall strength of the connection between the steel structure cantilever section and the rotating block.

[0041] Specifically, a plurality of No. 2 fixing holes 20 are correspondingly provided between the steel structure cantilever section 8 and the rotating block 6, and the rotating block 6 and the steel structure cantilever section 8 are fixed by inserting a pin in the No. 2 fixing hole 20. After the steel structure cantilever section 8 is inserted into the cantilever beam installation slot on the rotating block, the steel structure cantilever section 8 is provided to increase the strength of the connection part between the cantilever beam body and the rotating block, and prevent the cantilever beam from cracking due to the provision of the No. 2 fixing hole. The No. 2 fixing holes 20 between the steel structure cantilever section 8 and the rotating block 6 are aligned, and the steel structure cantilever section and the rotating block can be fixed after the pin is inserted in the No. 2 fixing hole.

[0042] Specifically, a steel skeleton 21 is provided in the concrete cantilever section 17, and the steel skeleton 21 includes a plurality of No. 1 steel bars 22 arranged along the length direction of the cantilever beam body 2, and the plurality of No. 1 steel bars 22 are surrounded by a rectangle, and the steel structure cantilever section 8 is provided with a plurality of connection grooves 23 corresponding to the No. 1 steel bars 22, which are inserted into the connection grooves 23, and the connection between the No. 1 steel bars 22 and the connection grooves 23 is welded and fixed, and also includes a plurality of No. 2 steel bars 24 arranged horizontally and No. 3 steel bars 25 arranged vertically, and the connection between the No. 1 steel bars 22, the No. 2 steel bars 24 and the No. 3 steel bars 25 is welded and fixed. Providing a steel skeleton in the concrete cantilever section can increase the strength, and providing a connection groove on the steel structure cantilever section and inserting the No. 1 steel bar into the connection groove can increase the connection strength between the steel structure cantilever section and the concrete cantilever section.

[0043] like Figure 1-Figure 5 As shown, a large cantilever beam construction method using a large cantilever beam structure comprises the following steps:

[0044] Step A: Install the traction seat 10 in the traction mechanism 9 onto the fixed block 3, install the lifting ring 14 onto the traction block 13, open a fixed block installation slot 4 on the wall 1, insert the fixed end 5 of the fixed block 3 into the fixed block installation slot 4 and fix it with expansion screws;

[0045] Step B: prefabricate the steel frame 21 in the steel structure cantilever section 8 and the concrete cantilever section 17, weld and fix the steel frame 21 to the steel structure cantilever section 8, and install a panel 26 on the periphery of the steel frame 21, with one end of the panel 26 fixed to the steel structure cantilever section 8 and the other end fixed to the tail of the steel frame 21;

[0046] Step C: Rotate the rotating block 6 until the opening of the cantilever beam installation slot 7 is tilted downward, lift one end of the steel structure cantilever section 8 of the cantilever beam body 2 and insert the steel structure cantilever section 8 into the cantilever beam installation slot 7, and insert the pin into the No. 2 fixing hole 20 to fix the steel structure cantilever section 8 and the rotating block 6;

[0047] Step D: Pull out the traction rope 12 on the traction sheave 11 in the traction mechanism 9, fix the traction rope 12 to the lifting ring 14, drive the traction sheave 11 to rotate through the oil cylinder, and the rotation of the traction sheave 11 can pull the rotating block 6 to rotate upward along the rotating shaft 27 through the traction rope 12, until the rotating block 6 rotates to the point where the positioning portion 15 of the rotating block 6 abuts against the outer end of the fixed block 3, and the cantilever beam body 2 is in a horizontal state, and insert the pin into the No. 1 fixing hole 16;

[0048] Step E: Pour concrete into the enclosure 26. After the concrete solidifies to form the concrete cantilever section 17, the enclosure 26 is removed, and the traction seat 10 and the lifting ring 14 are removed together.

[0049] In this construction method, the traditional method of directly inserting the cantilever beam into the wall is abandoned, which reduces the area of ​​the hole on the wall after the cantilever beam is removed, and can reduce the difficulty of repair after removal. Secondly, when installing the cantilever beam body, the rotating block is rotated until the notch of the cantilever beam installation slot on the rotating block is tilted downward, so that when installing the cantilever beam body, only the steel structure cantilever section of the cantilever beam body needs to be lifted, so that the cantilever beam body can be connected with the rotating block in an inclined state, and the concrete cantilever section is cast on site. The overall weight of the cantilever beam body is relatively small, and it can be installed by manpower with the help of small tools in a small space area, and the construction difficulty is low.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0051] Although this article uses the terms wall 1, cantilever beam body 2, fixed block 3, fixed block mounting groove 4, fixed end 5, rotating block 6, cantilever beam mounting groove 7, steel structure cantilever section 8, traction mechanism 9, traction seat 10, traction wheel 11, traction rope 12, traction block 13, lifting ring 14, positioning part 15, No. 1 fixing hole 16, concrete cantilever section 17, reinforced connecting structure 18, I-shaped connecting block 19, No. 2 fixing hole 20, steel frame 21, No. 1 steel bar 22, connecting groove 23, No. 2 steel bar 24, No. 3 steel bar 25, enclosure 26, rotating shaft 27, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A large cantilever beam structure, comprising a wall (1) and a cantilever beam body (2), characterized in that: The wall (1) is provided with a fixed block (3) for mounting the cantilever beam body (2); the wall (1) is provided with a fixed block mounting groove (4); the fixed end (5) of the fixed block (3) is inserted into the fixed block mounting groove (4); the fixed block (3) is rotatably connected to a rotating block (6) capable of rotating up and down via a rotating shaft (27); the rotating block (6) is provided with a cantilever beam mounting groove (7); the steel structure cantilever section (8) of the cantilever beam body (2) is inserted into the cantilever beam mounting groove (7); the fixed block (3) is also provided with a traction mechanism (9) connected to the rotating block (6).

2. The large cantilever beam structure according to claim 1, characterized in that: The traction mechanism (9) comprises a traction seat (10) fixed on the top of the fixed block (3), a traction wheel (11) driven by an oil cylinder is arranged inside the traction seat (10), a traction rope (12) is fixedly wound around the traction wheel (11), a traction block (13) is fixedly connected to the top of the rotating block (6), and a lifting ring (14) which can be connected to the traction rope (12) is arranged on the traction block (13).

3. The large cantilever beam structure according to claim 2, characterized in that: The traction seat (10) is detachably fixed to the fixing block (3) by means of a plurality of bolts, and the end of the lifting ring (14) is screwed to the traction block (13).

4. The large cantilever beam structure according to claim 2, characterized in that: When the cantilever beam body (2) is in a horizontal state, the positioning portion (15) of the rotating block (6) abuts against the outer end of the fixed block (3).

5. The large cantilever beam structure according to claim 4, characterized in that: The rotating block (6) and the fixed block (3) are correspondingly provided with a No. 1 fixing hole (16); when the cantilever beam body (2) is in a horizontal state, the No. 1 fixing holes (16) on the rotating block (6) and the fixed block (3) are aligned with each other, and the rotating block (6) and the fixed block (3) are fixed by a pin shaft passing through the No. 1 fixing hole (16).

6. A large cantilever beam structure according to any one of claims 1 to 5, characterized in that: The cantilever beam body (2) comprises a steel structure cantilever section (8) and a concrete cantilever section (17), and a reinforced connection structure (18) is also provided between the steel structure cantilever section (8) and the rotating block (6).

7. The large cantilever beam structure according to claim 6, characterized in that: The reinforced connection structure (18) comprises an I-shaped connection block (19) protruding from the middle of the cantilever beam installation groove (7), and the I-shaped connection block (19) is inserted into the cantilever section (8) of the steel structure.

8. The large cantilever beam structure according to claim 7, characterized in that: A plurality of No. 2 fixing holes (20) are correspondingly arranged between the steel structure cantilever section (8) and the rotating block (6), and the rotating block (6) and the steel structure cantilever section (8) are fixed by pins passing through the No. 2 fixing holes (20).

9. The large cantilever beam structure according to claim 6, characterized in that: A steel frame (21) is arranged in the concrete cantilever section (17), and the steel frame (21) includes a plurality of No. 1 steel bars (22) arranged along the length direction of the cantilever beam body (2), and the plurality of No. 1 steel bars (22) are surrounded by a rectangle. A plurality of connecting grooves (23) corresponding to the No. 1 steel bars (22) are arranged inwardly on the steel structure cantilever section (8), and the No. 1 steel bars (22) are inserted into the connecting grooves (23), and the connection between the No. 1 steel bars (22) and the connecting grooves (23) is welded and fixed. The steel frame also includes a plurality of horizontally arranged No. 2 steel bars (24) and vertically arranged No. 3 steel bars (25), and the connection between the No. 1 steel bars (22), the No. 2 steel bars (24) and the No. 3 steel bars (25) is welded and fixed.

10. A method for constructing a large cantilever beam using the large cantilever beam structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step A: Install the traction seat (10) in the traction mechanism (9) onto the fixed block (3), install the lifting ring (14) onto the traction block (13), open a fixed block installation groove (4) on the wall (1), insert the fixed end (5) of the fixed block (3) into the fixed block installation groove (4) and fix it with expansion screws; Step B: prefabricate and process the steel frame (21) in the steel structure cantilever section (8) and the concrete cantilever section (17), weld and fix the steel frame (21) to the steel structure cantilever section (8), and install a panel (26) on the periphery of the steel frame (21), wherein one end of the panel (26) is fixed to the steel structure cantilever section (8), and the other end is fixed to the rear end of the steel frame (21); Step C: rotating the rotating block (6) until the opening of the cantilever beam installation slot (7) is tilted downward, lifting one end of the steel structure cantilever section (8) of the cantilever beam body (2) and inserting the steel structure cantilever section (8) into the cantilever beam installation slot (7), inserting the pin into the No. 2 fixing hole (20) to fix the steel structure cantilever section (8) and the rotating block (6); Step D: Pull out the traction rope (12) on the traction sheave (11) in the traction mechanism (9), fix the traction rope (12) to the lifting ring (14), drive the traction sheave (11) to rotate through the oil cylinder, and the rotation of the traction sheave (11) can pull the rotating block (6) to rotate upward along the rotating shaft (27) through the traction rope (12), until the rotating block (6) rotates to the point where the positioning portion (15) of the rotating block (6) abuts against the outer end of the fixed block (3), and the cantilever beam body (2) is in a horizontal state, and insert the pin into the No. 1 fixing hole (16); Step E: pouring concrete in the enclosure (26), and after the concrete solidifies to form the concrete cantilever section (17), removing the enclosure (26), and removing the traction seat (10) and the lifting ring (14) together.

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