Whole construction method of diamond-shaped cable-stayed tower assembly closure segment formwork without support method

Abstract

The application discloses a whole installation and dismounting construction method of a diamond-shaped cable tower assembly type closure section formwork without support, and comprises the following steps: S1, processing closure section arch member, bottom die and bracket in a rear field; S2, transporting the closure section arch member, bottom die and bracket to a construction site and assembling the closure section arch; S3, pre-burying operation platforms and bracket pre-buried parts; S4, removing the inside formwork of the tower column and the climbing frame; S5, installing the operation platforms and brackets on the pre-buried parts; S6, installing the closure section arch and the bottom die on the bracket; S7, reinforcing steel bar binding, installing the formwork and then pouring the closure section concrete; and S8, integrally removing the closure section arch and integrally lowering the closure section arch through a hoisting device. Compared with the traditional landing type support method of 'from bottom to top and piece by piece installation', the scheme adopts the assembly type closure section arch, is integrated in place, is formed at one time, is integrally lowered, changes the working site from high-altitude construction to ground construction, is safe and controllable, and the number of high-altitude operation personnel and operation time are greatly reduced.

Description

Technical Field

[0001] This application relates to the field of construction technology for the closure section of a cable tower, and in particular to a method for the overall installation and dismantling of prefabricated closure section formwork without support for diamond-shaped cable towers. Background Technology

[0002] Conventional closure sections typically employ ground-mounted arch frame construction, erecting the structure layer by layer and column by column from the foundation, with workers performing vertical welding between the components at high altitude. Even with strict control over the erection process, this method still reveals several significant drawbacks due to the unique construction environment and working conditions of the pylon closure section, as follows: 1. The stability control of the ultra-high arch frame system is difficult and the safety risks are prominent: the height of the pylon closure section reaches 100 meters, the slenderness ratio of the ultra-high ground-based arch frame is large, and the overall stiffness is reduced; it is extremely sensitive to external environmental factors such as wind load and temperature changes; the stability calculation and on-site control of the arch frame have become huge challenges, and there are always significant safety risks throughout the construction process.

[0003] 2. The erection and dismantling of the arch frame has a long cycle and insufficient ability to compress the critical path schedule: The erection and dismantling of such a large and dense arch frame system requires a lot of time, manpower, equipment and materials. Using ground-mounted arch frames cannot effectively compress the schedule of the critical path of closure.

[0004] 3. The arch frame system has a high space occupancy rate and poor compatibility with multi-process operations: The traditional ground-mounted arch frame system is large in size and has a wide frame layout range, which requires a large amount of horizontal and vertical space in the work area; it affects the tower crane layout and the work surface of multiple processes such as tower column reinforcement construction and formwork installation; and it reduces the space utilization rate of the construction site. Summary of the Invention

[0005] The purpose of this application is to provide a method for the overall installation and dismantling of prefabricated closure section formwork for diamond-shaped cable towers without scaffolding, in order to improve the problems of cumbersome arch frame erection, long cycle, and large space occupation.

[0006] Firstly, the diamond-shaped cable tower prefabricated closure section formwork installation and dismantling method without scaffolding provided in this application adopts the following technical solution: The method for the overall installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without scaffolding includes the following steps: S1. Post-processing of the closure section arch frame components, bottom mold and brackets; S2. Transport the arch frame components, bottom formwork, and corbels of the closure section to the construction site, and assemble the closure section arch frame on the site platform; S3, pre-embedded parts for the operating platform and bracket; S4. Remove the inner formwork and climbing scaffold of the tower column; S5. Install the operating platform and bracket on the pre-embedded parts; S6. Install the closure section arch frame and bottom formwork system on the corbel; S7. Reinforcing steel binding, formwork installation, and then pouring concrete for the closure section; S8. The entire closure section arch frame is dismantled and the entire closure section arch frame is lowered using a hoisting device.

[0007] By adopting the above technical solution, compared with the traditional ground-based scaffolding method of "installing piece by piece from bottom to top", this solution uses a prefabricated closure section arch frame, which is formed as a whole and lowered as a whole. This changes the work site from high-altitude construction to ground construction, making it safer and more controllable. The number of people working at height and the working time are greatly reduced. The prefabricated closure section arch frame is prefabricated in the back-end, reducing the frequency and time of high-altitude hoisting by large cranes on site, which can more effectively speed up the construction progress and improve work efficiency. The traditional ground-based arch frame dismantling operation is carried out from top to bottom, dismantling piece by piece. The dismantling risk is high, with a high risk of people and objects falling from heights, requiring more manpower, material resources and resources. In contrast, the prefabricated closure section arch frame can be lowered as a whole and quickly disassembled, reducing the input of workers and equipment resources, making it safer and more reliable, and saving a lot of working time.

[0008] Optionally, step S3 may further include the following steps: S31. According to the installation location in the design drawings, measure the positioning coordinates of the operating platform and the bracket, and mark them after they meet the requirements of the design drawings; S32. Install the operating platform and the pre-embedded parts of the bracket according to the markings in S31.

[0009] Optionally, step S4 may further include the following steps: S41. Due to the misaligned construction of the tower columns, after the right tower column is poured and reaches the concrete strength, the inner formwork and climbing frame of the right side are removed. S42. After the right-side inner formwork and climbing scaffold are removed, the left-side climbing scaffold is raised. After the left-side concrete is poured and reaches the required strength, the left-side inner formwork and climbing scaffold are removed according to the demolition procedure.

[0010] The above technical solution requires clearing necessary operating space for the installation of the closure section arch frame and bottom formwork. The inner formwork and climbing frame of the tower column construction will hinder the installation of the closure section arch frame, so the side formwork and climbing frame need to be removed.

[0011] Optionally, step S5 may also include the following steps: S51. Install the operating platform for the closure section arch frame; S52. The workers install the bracket anchor plate on the operating platform according to the position of the embedded part, and the back of the anchor plate is tightly attached to the concrete surface. S53. Before installing the bracket, grind the welding surfaces of the H-beam and the anchor plate smooth, and then weld the bracket to the anchor plate.

[0012] The above technical solution involves first installing an operating platform so that workers can operate on it, and then welding the bracket and anchor plate together to ensure the reliability of the bracket.

[0013] Optionally, step S6 includes the following steps: S61. Install unloading blocks on the bracket; S62. The closure section arch frame is hoisted onto the unloading block using a tower crane with four-point hoisting, and then installed and fixed.

[0014] The above technical solution involves first installing the unloading blocks, and then hoisting the closure section arch frame onto the unloading blocks for later unloading.

[0015] Optionally, the unloading block includes a base cylinder, a sand chamber is provided inside the base cylinder, the sand chamber is filled with fine sand, a sand column is inserted into the sand chamber, a top plate is connected to the sand column, a temporary chamber is also provided inside the base cylinder, the temporary chamber is connected to the sand chamber through a connecting port, the connecting port is located on the side wall at the bottom of the sand chamber, and a sealing element for sealing the connecting port is provided on the base cylinder.

[0016] By adopting the above technical solution, the unloading block of the traditional unloading block generally adopts a mechanical structure. The unloading block of this application uses fine sand for unloading. When unloading is required, the sealing part is removed and the fine sand flows from the sand chamber to the temporary chamber. At this time, the sand column slowly descends to unload the arch frame of the closure section. At the same time, after the unloading block is recovered, the unloading block can be inverted as a whole. At this time, the fine sand flows back to the sand chamber under the action of gravity, which is convenient for reuse. Since the fine sand is also reused, the particle size and the quantity of fine sand are relatively fixed, so the adjustment accuracy is relatively higher.

[0017] Optionally, the sand column and the top plate are connected by a ball joint.

[0018] By adopting the above technical solution, the ball joint connection between the sand column and the top plate facilitates the fit between the top plate and the bottom of the closure section arch frame, and adapts to minor errors that may occur during production and assembly.

[0019] Optionally, the sealing component includes a sealing bolt and a sealing head connected to each other. The sealing bolt is threadedly connected to the base cylinder, and the sealing head is used to insert into the communication port to seal the communication port.

[0020] The above technical solution facilitates the sealing of the connection port by using the sealing head, while the sealing bolt is connected to the base cylinder by threads, ensuring the reliability of the sealing head in sealing the connection port.

[0021] Optionally, a tension member is provided between the bottom wall of the sand silo and the sand column.

[0022] By adopting the above technical solution, the tensioning component prevents the sand column from detaching from the sand chamber when the unloading block is inverted. At the same time, the tensioning component applies pressure to the sand column, which makes it easy for fine sand to flow to the temporary chamber even when the top plate is not bearing a load, and facilitates the adjustment of the top plate height.

[0023] Optionally, step S8 includes the following steps: S81. Install and secure the winch at the designated position on the lower crossbeam; S82. Install fixed pulleys on the side of the tower column according to the location of the fixed pulley embedded parts; S83. Pull the wire rope from the winch around the movable pulley and connect it to the lifting lug on the special lifting device of the closure section arch frame; S84. The winch pulls the wire rope and applies force, so that the weight of the arch frame of the closure section is transferred from the unloading block to the winch. S85. Unload and remove the unloading blocks on the bracket one by one; S86. Cut off the weld between the bracket and the anchor plate, and be careful to remove the bracket and anchor plate; S87. Dismantle the operating platform and use a tower crane to lift the equipment onto the platform for neat stacking and cutting. S88. The winch slowly releases the wire rope, and the arch frame of the closure section gradually descends using its own weight. S89. After the closure section arch frame is lowered onto the top surface of the lower crossbeam, the closure section arch frame is disassembled and transferred to the rear site.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. Compared to the traditional ground-mounted scaffolding method of "installing piece by piece from bottom to top", this solution adopts a prefabricated closure section arch frame, which is formed in one piece and lowered as a whole. This changes the work site from high-altitude construction to ground construction, making it safer and more controllable. The number of people working at height and the working time are greatly reduced. The prefabricated closure section arch frame is prefabricated in the back-end, reducing the frequency and time of high-altitude hoisting by large cranes on site, which can more effectively speed up the construction progress and improve work efficiency. The traditional ground-mounted arch frame solution is dismantled from top to bottom, piece by piece. The dismantling operation is risky, with a high risk of people and objects falling from heights. It requires more manpower, material resources and other resources. The prefabricated closure section arch frame can be lowered as a whole and quickly disassembled, reducing the input of workers and equipment resources, making it safer and more reliable, and saving a lot of working time. 2. Necessary operating space needs to be cleared for the installation of the closure section arch frame and bottom formwork. The inner formwork and climbing scaffold of the tower column construction will hinder the installation of the closure section arch frame, so the side formwork and climbing scaffold need to be removed. 3. Traditional unloading blocks generally adopt a mechanical structure. The unloading block of this application uses fine sand for unloading. When unloading is required, the sealing part is removed and the fine sand flows from the sand chamber to the temporary chamber. At this time, the sand column slowly descends to unload the arch frame of the closure section. At the same time, after the unloading block is recovered, the unloading block can be inverted as a whole. At this time, the fine sand flows back to the sand chamber under the action of gravity, which is convenient for reuse. Since the fine sand is also reused, the particle size and quantity of fine sand are relatively fixed, so the adjustment accuracy is relatively higher. 4. The sealing head facilitates sealing of the connection port, while the sealing bolts are threadedly connected to the base cylinder, ensuring the reliability of the sealing head's sealing of the connection port. The tension member prevents the sand column from detaching from the sand chamber when the unloading block is inverted. At the same time, the tension member applies pressure to the sand column, allowing fine sand to flow to the temporary chamber even when the top plate is not under load, facilitating the adjustment of the top plate height. Attached Figure Description

[0025] Figure 1 This is a frontal schematic diagram illustrating the closure section of the arch frame in this invention.

[0026] Figure 2 This is a frontal schematic diagram illustrating the positional relationship between the closure section arch, corbel, and operating platform in this invention.

[0027] Figure 3 This is a partially enlarged schematic diagram illustrating the unloading block and the corbel in this invention.

[0028] Figure 4 This is a cross-sectional schematic diagram illustrating the unloading block in this invention.

[0029] Figure 5 This is a schematic diagram illustrating the sealing component in this invention.

[0030] Figure 6 This is a frontal schematic diagram illustrating the fixed pulley in this invention.

[0031] Figure 7 This is a side view of the fixed pulley in this invention.

[0032] In the diagram, 1. Closure section arch frame; 2. Corbel; 21. Embedded part; 3. Unloading block; 31. Base cylinder; 32. Sand bin; 33. Sand column; 34. Top plate; 35. Connecting port; 36. Sealing part; 361. Sealing bolt; 362. Sealing head; 37. Tensioning part; 38. Temporary bin; 5. Fixed pulley; 7. Operating platform. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Example 1 Firstly, this application discloses a method for the overall installation and dismantling of prefabricated closure section formwork for diamond-shaped cable towers without scaffolding.

[0036] The method for the overall installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without scaffolding is described in reference [reference]. Figures 1 to 7 The construction method for the prefabricated closure section formwork of the diamond-shaped cable tower without scaffolding, including the following steps: S1. Post-processing of the closure section arch frame 1 component, bottom formwork and corbel 2.

[0037] S2. Transport the closure section arch frame 1 component, bottom formwork and corbel 2 to the construction site, and assemble the closure section arch frame 1 on the site platform.

[0038] S3, the embedded parts 21 of the pre-embedded operating platform 7 and the bracket 2. It also includes the following steps: S31. According to the installation location in the design drawings, measure the positioning coordinates of the operating platform 7 and the bracket 2, and mark them after they meet the requirements of the design drawings. S32. Install the operating platform 7 and the embedded part 21 of the bracket 2 according to the markings in S31.

[0039] It should be noted that the embedded part 21 can be a combination of bolts and tapered nuts to ensure the embedded strength. At the same time, the end face of the tapered nut should be wrapped with transparent tape to reduce the possibility of concrete slurry seeping into the tapered nut, and to ensure that the concrete is compacted during vibration without disturbing the bolt position.

[0040] S4. Remove the inner formwork and climbing scaffolding of the tower column. This also includes the following steps: S41. Due to the misaligned construction of the tower columns, after the right tower column is poured and reaches the concrete strength, the inner formwork and climbing frame of the right side are removed. S42. After the right-side inner formwork and climbing scaffold are removed, the left-side climbing scaffold is raised. After the left-side concrete is poured and reaches the required strength, the left-side inner formwork and climbing scaffold are removed according to the demolition procedure.

[0041] It should be noted that necessary operating space needs to be cleared for the installation of the closure section arch frame 1 and the bottom formwork. The inner formwork and climbing frame of the tower column construction will hinder the installation of the closure section arch frame 1, so the side formwork and climbing frame need to be removed.

[0042] S5. Install the operating platform 7 and the bracket 2 on the pre-embedded part 21. This also includes the following steps: S51. Install the closure section arch frame 1 operating platform 7; S52. The operator installs the bracket 2 anchor plate on the operating platform 7 according to the position of the embedded part 21, and the back of the anchor plate is tightly attached to the concrete surface. S53. Before installing bracket 2, grind the welding surfaces of the H-beam and the anchor plate smooth, and then weld bracket 2 to the anchor plate. Use a slit-welded weld with equal penetration between bracket 2 and the anchor plate.

[0043] It should be noted that the operating platform 7 is installed first so that the operators can work on the operating platform 7. The bracket 2 and the anchor plate are welded together to ensure the reliability of the bracket 2.

[0044] S6. Install the closure section arch frame 1 and the bottom formwork system on the corbel 2. This includes the following steps: S61. Install unloading block 3 on bracket 2; S62. Using a tower crane, the closure section arch frame 1 is hoisted onto the unloading block 3 using a four-point hoisting method and then installed and secured. The closure section arch frame can be connected to the bracket 2 via bolts or welding. During construction, the unloading block 3 is installed first, and then the closure section arch frame 1 is hoisted onto the unloading block 3 to facilitate subsequent unloading. After the closure section arch frame 1 is hoisted above the unloading block 3, it is slowly fed into the unloading block 3 from the lower mileage side.

[0045] Specifically, refer to Figure 4 and Figure 5The unloading block 3 includes a base cylinder 31, a sand chamber 32 is provided inside the base cylinder 31, the sand chamber 32 is filled with fine sand, a sand column 33 is inserted inside the sand chamber 32, the side wall of the sand column 33 is attached to the inner wall of the sand chamber 32, and a top plate 34 is connected to the sand column 33. A temporary chamber 38 is also provided inside the base cylinder 31. The temporary chamber 38 is connected to the sand chamber 32 through a connecting port 35. The connecting port 35 is located on the side wall at the bottom of the sand chamber 32. A sealing element 36 for sealing the connecting port 35 is provided on the base cylinder 31.

[0046] Traditional unloading blocks 3 generally employ a mechanical structure. The unloading block 3 of this application uses fine sand for unloading. When unloading is required, the sealing component 36 is removed, and the fine sand flows from the sand chamber 32 to the temporary chamber 38. At this time, the sand column 33 slowly descends to unload the closure section arch frame 1. After the unloading block 3 is retrieved, it can be inverted as a whole. The fine sand then flows back to the sand chamber 32 under gravity for reuse. Since the fine sand is also reusable, the particle size and quantity are relatively fixed, resulting in higher adjustment precision. It should be noted that the cross-sectional area of ​​the temporary chamber 38 gradually increases from top to bottom to ensure sufficient space for the fine sand to flow in and to facilitate the convergence of the fine sand back to the connecting port 35.

[0047] In addition, the sand column 33 and the top plate 34 are connected by a ball joint. The ball joint connection between the sand column 33 and the top plate 34 facilitates the fit between the top plate 34 and the bottom of the closure section arch frame 1, and accommodates minor errors that may occur during production and assembly.

[0048] More specifically, the sealing component 36 includes a sealing bolt 361 and a sealing head 362 connected to each other. The sealing bolt 361 is threadedly connected to the base cylinder 31, and the sealing head 362 is used to insert into the communication port 35 to seal the communication port 35. The sealing head 362 facilitates the sealing of the communication port 35, while the sealing bolt 361, through its threaded connection with the base cylinder 31, ensures the reliability of the sealing head 362 in sealing the communication port.

[0049] It should be noted that a tension member 37 connects the bottom wall of the sand bin 32 and the sand column 33. The tension member 37 prevents the sand column 33 from detaching from the sand bin 32 when the unloading block 3 is inverted. Simultaneously, the tension member 37 applies pressure to the sand column 33, allowing fine sand to flow to the temporary bin 38 even when the top plate 34 is not under load, facilitating adjustment of the top plate 34's height. The tension member 37 can be a tension spring or an elastic rope.

[0050] S7. Reinforcing steel is tied, formwork is installed, and then the closure section concrete is poured.

[0051] S8. Completely dismantle the closure section arch frame 1, and lower the closure section arch frame 1 entirely using a hoisting device. (Refer to...) Figure 6 and Figure 7 It includes the following steps: S81. Install and secure the winch at the designated position on the lower crossbeam; S82. Install fixed pulley 5 on the side of the tower column according to the position of the pre-embedded block of fixed pulley 5; S83. Pull the wire rope from the winch around the movable pulley and connect it to the lifting lug on the special lifting device of the closure section arch frame 1; S84. The winch pulls the wire rope and applies force, so that the weight of the closure section arch frame 1 is transferred from the unloading block 3 to the winch. S85. Unload and remove the unloading blocks 3 on the bracket 2 one by one; S86. Cut off the weld between bracket 2 and anchor plate, and remove bracket 2 and anchor plate carefully. S87. Dismantle the operating platform 7, and use a tower crane to lift it to the platform for neat stacking and cutting. S88. The winch slowly releases the wire rope, and the closure section arch frame 1 gradually descends using its own weight. The surveyors set up 4 measuring points on the closure section arch frame 1 in advance. During the descent, they continuously observe the levelness of the 4 measuring points. If the difference between the 4 measuring points is greater than 10cm, they notify the command personnel to control the descent speed of the winch and adjust it to be level before continuing the descent. S89. After the closure section arch frame 1 is lowered onto the top surface of the lower crossbeam, the closure section arch frame 1 is disassembled and transferred to the rear site.

[0052] Working Principle: Compared to the traditional ground-based scaffolding method of "installing piece by piece from bottom to top," this solution uses a prefabricated closure section arch frame 1, which is formed as a whole and lowered as a whole. This changes the work site from high-altitude construction to ground-based construction, making it safer and more controllable. The number of people working at heights and the time spent working at heights are greatly reduced. The prefabricated closure section arch frame 1 is prefabricated in the back-end, reducing the frequency and time of high-altitude hoisting by large cranes on site, thus more effectively accelerating the construction progress and improving work efficiency. The traditional ground-based arch frame solution involves dismantling from top to bottom, piece by piece, which carries high risks, such as the risk of people and objects falling from heights, and requires more manpower, material resources, and resources. In contrast, the prefabricated closure section arch frame 1 can be lowered as a whole and quickly disassembled, reducing the investment of personnel and equipment resources, making it safer and more reliable, and saving a lot of working time.

[0053] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for the overall installation and dismantling of prefabricated closure section formwork for diamond-shaped cable towers without scaffolding, characterized in that... Includes the following steps: S1. Back-end processing of the closure section arch frame (1) components, bottom formwork and corbel (2); S2. Transport the closure section arch frame (1) components, bottom formwork and corbel (2) to the construction site and assemble the closure section arch frame (1) on the site platform; S3, embedded parts (21) of the pre-embedded operating platform (7) and the bracket (2); S4. Remove the inner formwork and climbing scaffold of the tower column; S5. Install the operating platform (7) and bracket (2) on the pre-embedded parts (21); S6. Install the closure section arch frame (1) and bottom formwork system on the corbel (2); S7. Reinforcing steel binding, formwork installation, and then pouring concrete for the closure section; S8. The entire closure section arch frame (1) is dismantled and the entire closure section arch frame (1) is lowered using a hoisting device.

2. The method for the overall installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 1, is characterized in that: Step S3 also includes the following steps: S31. According to the designed installation location, measure the positioning coordinates of the operating platform (7) and the bracket (2), and mark them after they meet the requirements of the design drawings; S32. Install the embedded parts (21) of the operating platform (7) and the bracket (2) according to the markings in S31.

3. The method for the overall installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 2, is characterized in that: Step S4 also includes the following steps: S41. Due to the misaligned construction of the tower columns, after the right tower column is poured and reaches the concrete strength, the inner formwork and climbing frame of the right side are removed. S42. After the right-side inner formwork and climbing scaffold are removed, the left-side climbing scaffold is raised. After the left-side concrete is poured and reaches the required strength, the left-side inner formwork and climbing scaffold are removed according to the demolition procedure.

4. The method for the overall installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 3, is characterized in that: Step S5 also includes the following steps: S51, Install the closure section arch frame (1) and operating platform (7); S52. The operator installs the bracket (2) anchor plate on the operating platform (7) according to the position of the embedded part (21), and the back of the anchor plate is tightly attached to the concrete surface. S53. Before installing the bracket (2), grind the welding surface of the H-beam and the anchor plate flat, and weld the bracket (2) to the anchor plate.

5. The method for the overall installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 4, is characterized in that: Step S6 includes the following steps: S61. Install unloading blocks (3) on the cow leg (2); S62. The closure section arch frame (1) is hoisted onto the unloading block (3) using a tower crane with four-point hoisting and then installed and fixed.

6. The method for the overall installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 5, is characterized in that: The unloading block (3) includes a base cylinder (31), a sand chamber (32) is provided inside the base cylinder (31), the sand chamber (32) is filled with fine sand, a sand column (33) is inserted inside the sand chamber (32), a top plate (34) is connected to the sand column (33), a temporary chamber (38) is also provided inside the base cylinder (31), the temporary chamber (38) and the sand chamber (32) are connected through a connecting port (35), the connecting port (35) is located on the side wall at the bottom of the sand chamber (32), and a sealing element (36) for sealing the connecting port (35) is provided on the base cylinder (31).

7. The method for integral installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 6, is characterized in that: The sand column (33) is connected to the top plate (34) by a ball joint.

8. The method for integral installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 7, is characterized in that: The sealing component (36) includes a sealing bolt (361) and a sealing head (362) connected to each other. The sealing bolt (361) is threadedly connected to the base cylinder (31), and the sealing head (362) is used to insert into the communication port (35) to seal the communication port (35).

9. The method for the overall installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 8, is characterized in that: A tension member (37) is connected between the bottom wall of the sand bin (32) and the sand column (33).

10. The method for integral installation and dismantling of the prefabricated closure section formwork of the diamond-shaped cable tower without support, as described in claim 5, is characterized in that: Step S8 includes the following steps: S81. Install and secure the winch at the designated position on the lower crossbeam; S82. Install the fixed pulley (5) on the side of the tower column according to the position of the pre-embedded block of the fixed pulley (5); S83. Pull the wire rope from the winch around the moving pulley and connect it to the lifting lug on the special lifting device of the closure section arch frame (1); S84. The winch pulls the wire rope and applies force, so that the weight of the closure section arch frame (1) is transferred from the unloading block (3) to the winch. S85. Unload and remove the unloading blocks (3) on the cow leg (2) one by one; S86. Cut off the weld between the bracket (2) and the anchor plate, and remove the bracket (2) and the anchor plate. S87. Dismantle the operating platform (7), and use a tower crane to lift it to the platform for neat stacking and cutting. S88, the winch slowly releases the wire rope, and the arch frame (1) of the closure section gradually descends using its own weight; S89. After the closure section arch frame (1) is lowered onto the top surface of the lower crossbeam, the closure section arch frame (1) is disassembled and transferred to the rear site.

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