A square pier construction turnover mold device and a construction method thereof

Abstract

The application provides a square pier construction formwork turnover device and a construction method thereof, and the traditional formwork turnover method is reformed, so that the protection assembly and the shaped formwork assembly are separated, the protection assembly and the outer formwork are separately hoisted through cooperation of the connecting block and the sliding rail 1, the work flow can be simplified, and the formwork turnover efficiency is improved without assembling and disassembling the protection assembly during the bridge pier formwork turnover; compared with the traditional formwork turnover method, the outer formwork of three layers or more than three layers needs to be sequentially turned up, and part of the protection assembly is welded on the outer formwork, so that the demand for construction materials is large, the formwork turnover can be performed through cooperation of two layers of the outer formwork and one layer of the protection assembly, the demand for construction materials is small, and the construction period can be shortened.

Description

Technical Field

[0001] This invention relates to the field of bridge pier construction technology, specifically to a pier construction formwork device and its construction method. Background Technology

[0002] With the rapid development of transportation and the continuous advancement of bridge technology, modern bridges are gradually developing towards longer spans. Due to structural needs and the constraints of terrain and landforms at the bridge site, it is not uncommon to see bridge piers exceeding 100 meters in height and cable towers exceeding 100 meters in height in bridge design. This places higher demands on construction technology. How to achieve high-quality, safe, and efficient construction of such tall hollow or solid thin-walled structures is a difficult problem in modern bridge construction.

[0003] The main principle of the existing square pier formwork flipping technology is that as each segment of concrete is poured, the platform is lifted by hydraulic jacks or cranes, which in turn drives the scaffolding, and the formwork is continuously flipped up until the top of the pier, ensuring the appearance quality of the pier body. However, the traditional formwork flipping technology requires separate disassembly and reassembly of the construction protection platform and the outer formwork components, which reduces the efficiency of formwork flipping, makes the construction process cumbersome, consumes a lot of manpower and material resources, and affects the work effect and efficiency. Multiple disassembly and reassembly operations can easily lead to accidents due to frequent work by construction personnel. In addition, the traditional square pier formwork flipping method requires multiple layers of formwork and multiple layers of protection platform components, which requires a lot of materials and cannot meet the requirements of large-scale square pier construction.

[0004] To achieve the above objectives, the present invention provides a formwork turning device for pier construction and a construction method thereof, which can solve the problems mentioned in the background art. Summary of the Invention

[0005] The present invention adopts the following technical solution:

[0006] A formwork flipping device for pier construction includes protective components, an outer formwork, and a hollow inner formwork;

[0007] The outer template includes a fixed template and an adjustable template. The fixed template is located on both sides of the adjustable template. Both fixed templates include a shaping surface and an installation surface. A slide rail is provided on the installation surface. The two sides of the adjustable template are in contact with the shaping surface. The fixed template and the adjustable template are movably connected. The fixed template and the adjustable template can adjust the pouring area. The concrete pouring area can be controlled by changing the distance between the two adjustable templates.

[0008] The protective component is installed on the periphery of the outer template. The protective component is slidably connected to the slide rail. A connecting component is provided above the protective component. One end of the connecting component is connected to the fixed template. The protective component and the slide rail are interconnected. The position of the protective component can be changed by using a crane in conjunction with the slide rail. At the same time, the connection and disassembly between the protective component and the slide rail are also made easier, which can effectively simplify the construction formwork turning operation process.

[0009] The protective components include an operating platform and a protective fence. The operating platform is provided with a connecting block that is connected to the slide rail. A cement pouring layer is filled between the hollow inner template and the outer template. The connecting block is located on one side of the operating platform to facilitate manual installation, disassembly, daily maintenance and observation, and to prevent accidents.

[0010] Preferably, the connecting block is slidably connected to the slide rail, the upper part of the slide rail is provided with a connecting port, the connecting block is provided with a connecting port, and a high-strength bolt is inserted through the connecting port and the connecting port.

[0011] Preferably, the lower part of the mounting surface is provided with multiple connecting seats. The connecting assembly includes a rotating seat mounted above the operating platform. A connecting steel bar is rotatably connected to the rotating seat. The other end of the connecting steel bar cooperates with the connecting seat. A high-strength bolt is connected through the connecting steel bar and the connecting seat. By connecting the connecting steel bar to the rotating seat of the connecting seat, it is convenient to pre-fix the protective component during the mold flipping process, thereby improving stability. At the same time, after connecting the high-strength bolt, the connecting steel bar can transmit part of the supporting force to the mounting surface, indirectly improving stability.

[0012] Preferably, the operating platform has a reinforcing beam around its outer side, and the protective fence is installed above the reinforcing beam. The protective fence includes multiple connecting posts and guide rails. The multiple connecting posts are connected above the reinforcing beam, and the top surfaces of the multiple connecting posts are fixedly connected to the bottom of the guide rails. A protective net is provided between two adjacent connecting posts. The guide rails are placed above the reinforcing beam to provide support for the guide rails. At the same time, the safety of the protective components can be improved by increasing the protective net.

[0013] Preferably, the side of the reinforcing beam is provided with multiple lifting blocks one, and the side of the guide rail is provided with multiple lifting blocks two. The lifting blocks two correspond one-to-one with the lifting blocks one, and the axial position of the lifting blocks two is the same as that of the lifting blocks one. During hoisting, the lifting blocks one and the lifting blocks two are used to pull upwards, preventing the protective component from deforming due to the traction force, and making the overall rise of the protective component more stable.

[0014] Preferably, the guide rail is provided with a second slide rail, and multiple sliding seats are connected inside the second slide rail. A safety steel cable is connected above the sliding seats. One end of the safety steel cable is connected to the sliding seat and the other end is connected to the safety clothing worn by the construction worker, so as to ensure the safety of the construction worker.

[0015] Preferably, a limiting opening is provided above each of the connecting columns, and a limiting pin is provided inside the connecting column. The limiting pin passes through the upper and lower ends of the limiting opening. A limiting post is provided above the connecting column, and an L-shaped guide groove is provided on the surface of each connecting column. The limiting post is slidably disposed inside the guide groove, which is used to lock the limiting post. When it is necessary to protect the construction personnel, the two steel rings at both ends of the safety cable are placed in the limiting opening, and the limiting pin is inserted into the connecting column after passing through the two steel rings. In this way, the length of the safety cable is fixed, and the construction personnel will not have an accident due to movement.

[0016] Preferably, the safety cable includes multiple steel rings and a safety rope, with the steel rings connected to both ends of the safety rope.

[0017] A method for formwork construction of square piers includes the following steps:

[0018] S1. Lifting Preparation: Set up roadblocks and assign personnel to control traffic conditions. Determine the construction location of the square pier. Position the crane at a 45-degree angle to one side of the square pier to facilitate the load-bearing of lifting blocks one and two. Use four steel cables of the same length and load-bearing capacity to connect to lifting blocks one and two respectively. Set up a safety protection isolation zone 20 meters from the construction location of the square pier. Set up a formwork installation groove at the construction location of the square pier. Set up a hollow inner formwork. Install and pour the reinforcing steel of the base. Install the outer formwork inside the formwork installation groove. Install the first and second layers of outer formwork using the crane.

[0019] S2. Install the protective component: The protective component is connected to the connecting seat of the first layer by high-strength bolt two. After the first layer square pier is cast and formed, the high-strength bolt one is removed. The lifting blocks one and two are connected by a crane to lift the protective component to the outer formwork of the second layer. The protective component is connected to the outer formwork of the first layer by the high-strength bolt one. The connecting steel bar above the protective component is connected to the connecting seat above the outer formwork of the second layer by the high-strength bolt two.

[0020] S3. Operation: After the workers are lifted by the protective components, the next level of spiral installation of the threaded steel bars is required. At the same time, the workers need to apply release agent to the shaping surface of the outer formwork. Before pouring, the workers return to the protective platform via the safety steel cable.

[0021] S4. Lifting: When the outer formwork of the second layer is hoisted above the outer formwork of the first layer, the inner formwork of the first layer and the inner formwork of the second layer are aligned and adjusted by manual inspection. The connecting seat is connected to the rotating seat of the outer formwork of the second layer. The second high-strength bolt is installed. The hollow inner formwork is filled in by a crane. After the concrete is poured by the pump truck and the concrete layer strength reaches the standard, the first high-strength bolt is removed. Steps S2 and S3 are repeated.

[0022] Preferably, in step S3, the safety cable must be worn throughout the manual operation. Before the protective component is lifted, the safety cable needs to be fixed in the limiting port, and the steel ring needs to be connected to the limiting pin. The comfort of manual wearing is adjusted by the cooperation of the limiting pin and the steel ring.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. This invention modifies the traditional formwork method by separating the protective components from the fixed template components. Through the cooperation of the connecting block and the slide rail, the protective components do not need to be assembled or disassembled during the formwork of the bridge pier. The method of separately hoisting the protective components and the outer template can simplify the workflow and improve the efficiency of the formwork.

[0025] 2: Compared with the traditional formwork flipping method, which requires three or more layers of outer formwork to be flipped up one by one, and each of them is welded with some protective components, the demand for construction materials is large. This invention only requires two layers of outer formwork and one layer of protective components to flip up the formwork. It can adapt to the production of large quantities of bridge piers, has a smaller demand for construction materials, and can shorten the construction cycle.

[0026] 3: During construction, the sliding seat connects to the guide rail, ensuring the safety of the workers. At the same time, when the device is lifted, the length of the safety cable can be shortened by the cooperation of the limit pin and the steel ring, preventing workers from falling over.

[0027] 4: The entire protective assembly can be hoisted through hoisting holes one and two with the same axis, simplifying the hoisting process, reducing the difficulty of hoisting, and making it less likely for the templates to collide. Attached Figure Description

[0028] Figure 1 This is a partial structural diagram of the first outer template and protective components of the present invention;

[0029] Figure 2 This is a schematic diagram of the connection structure between the first outer template and the second outer template of the present invention;

[0030] Figure 3This is a schematic diagram of the operating platform and connecting components of the present invention;

[0031] Figure 4 This is a schematic diagram of the safety cable structure of the present invention;

[0032] Figure 5 This is a schematic diagram showing the connection between the sliding seat and the guide rail of the present invention;

[0033] Figure 6 This is a schematic diagram showing the connection between the connecting block and the slide rail of the present invention;

[0034] Figure 7 This is a cross-sectional view of the internal structure of the reinforced beam of the present invention;

[0035] Figure 8 This is a three-dimensional view of the reinforced beam structure of the present invention.

[0036] In the diagram: 1. Protective components; 2. Outer formwork; 3. Connecting components; 4. Hollow inner formwork; 5. Cement pouring layer;

[0037] 101. Operating platform; 102. Reinforcing beam; 103. Guide rail; 104. Protective net; 105. Lifting block one; 106. Lifting block two; 107. Slide rail two; 108. Sliding seat; 109. Safety cable; 110. Limiting port; 111. Limiting pin; 112. Limiting post; 113. Guide groove; 114. Steel ring; 115. Safety rope;

[0038] 201. Fixed template; 202. Adjustable template; 203. Shaping surface; 204. Mounting surface; 205. Slide rail one; 206. Connecting block; 207. Connecting port one; 208. Connecting port two; 209. High-strength bolt one; 210. Connecting seat;

[0039] 301. Rotating seat; 302. Connecting steel bar; 303. Two high-strength bolts. Detailed Implementation

[0040] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] The present invention will be further described in detail below with reference to the accompanying drawings.

[0044] In one embodiment of the present invention, please refer to the appendix for details. Figure 1-8 It includes protective component 1, outer template 2, and hollow inner template 4;

[0045] The outer template 2 includes a fixed template 201 and an adjustable template 202. The fixed template 201 is located on both sides of the adjustable template 202. Both fixed templates 201 include a shaping surface 203 and an installation surface 204. The installation surface 204 is provided with a slide rail 205. The two sides of the adjustable template 202 are in contact with the shaping surface 203. The fixed template 201 and the adjustable template 202 are movably connected. The fixed template 201 and the adjustable template 202 can adjust the pouring area. The concrete pouring area can be controlled by changing the distance between the two adjustable templates 202.

[0046] The protective component 1 is installed on the periphery of the outer template 2. The protective component 1 is slidably connected to the slide rail 205. A connecting component 3 is provided above the protective component 1. One end of the connecting component 3 is connected to the fixed template 201. The protective component 1 and the slide rail 205 are interconnected. The position of the protective component 1 can be changed by using a crane in conjunction with the slide rail. At the same time, the connection and disassembly between the protective component 1 and the slide rail 205 are also made easier, which can effectively simplify the construction formwork turning operation process.

[0047] The protective component 1 includes an operating platform 101 and a protective fence. The operating platform 101 is provided with a connecting block 206 connected to the slide rail 205. A cement pouring layer 5 is filled between the hollow inner template 4 and the outer template 2. The connecting block 206 is located on one side of the operating platform 101 to facilitate manual installation, disassembly, daily maintenance and observation, and to prevent accidents.

[0048] Please refer to this carefully. Figure 1 , Figure 2 , Figure 6The connecting block 206 is slidably connected to the slide rail 205. The upper part of the slide rail 205 is provided with a connecting port 207, and the connecting block 206 is provided with a connecting port 208. A high-strength bolt 209 is inserted through the connecting port 207 and the connecting port 208.

[0049] Please refer to this carefully. Figure 1-3 The lower part of the mounting surface 204 is provided with multiple connecting seats 210. The connecting assembly 3 includes a rotating seat 301 mounted above the operating platform 101. A connecting steel bar 302 is rotatably connected to the rotating seat 301. The other end of the connecting steel bar 302 cooperates with the connecting seat 210. A high-strength bolt 303 is connected through the connecting steel bar 302 and the connecting seat 210. By connecting the connecting steel bar 302 to the rotating seat 301 of the connecting seat 210, it is convenient to pre-fix the protective assembly 1 during the mold flipping process, thereby improving stability. At the same time, after connecting the high-strength bolt, the connecting steel bar 302 can transmit part of the supporting force to the mounting surface 204, indirectly improving stability.

[0050] This invention modifies the traditional molding method by separating the protective component 1 from the shaping template component.

[0051] The main operating procedure is as follows: prepare the materials required for the two layers of outer formwork 2 and the protective component 1. Before the operation, install the protective component 1 at the connection port 207 on the slide rail 205 of the first layer of outer formwork 2. After the concrete layer inside the first layer of outer formwork 2 reaches the required strength, the second layer of outer formwork 2 is installed above the first layer of outer formwork 2 by hoisting. The protective component 1 is connected to the second layer of outer formwork 2 by the connecting seat 210 and the rotating seat 301. At this time, the high-strength bolt 209 is removed to separate the protective component 1 from the first layer of outer formwork 2. The outer formwork 2 is then hoisted in sequence for the formwork flipping operation. Through the cooperation of the connecting block 206 and the slide rail 205, the protective component 1 does not need to be assembled or disassembled when flipping the formwork of the bridge pier, which simplifies the work process, reduces the material used for the protective component 1, and improves the efficiency of the formwork flipping operation.

[0052] In another embodiment of the invention, please refer to... Figure 1 The operating platform 101 has a reinforcing beam 102 around its outer side. The protective fence is installed above the reinforcing beam 102. The protective fence includes multiple connecting posts and guide rails 103. The multiple connecting posts are connected above the reinforcing beam 102. The top surface of the multiple connecting posts is fixedly connected to the bottom of the guide rails 103. A protective net 104 is provided between two adjacent connecting posts. The guide rails 103 are set above the reinforcing beam 102 to provide support for the guide rails 103. At the same time, the safety of the protective component 1 can be improved by raising the protective net 104.

[0053] Please refer to this carefully. Figure 1 The reinforcing beam 102 has multiple lifting blocks 105 on its side, and the guide rail 103 has multiple lifting blocks 106 on its side. The lifting blocks 106 correspond one-to-one with the lifting blocks 105, and the axial position of the lifting blocks 106 is the same as that of the lifting blocks 105. During hoisting, the lifting blocks 105 and the lifting blocks 106 are used to pull the protective component 1 upward, preventing it from deforming due to the traction force, and making the overall rise of the protective component 1 more stable.

[0054] Please refer to this carefully. Figure 1 , Figure 5 The guide rail 103 is equipped with a slide rail 2 107 inside. Multiple sliding seats 108 are connected inside the slide rail 2 107. A safety steel cable 109 is connected above the sliding seat 108. One end of the safety steel cable 109 is connected to the sliding seat 108 and the other end is connected to the safety clothing worn by the construction worker, so as to ensure the safety of the construction worker.

[0055] Please refer to this carefully. Figure 1 , Figure 7 , Figure 8 Each connecting column has a limiting port 110 extending through its top. A limiting pin 111 is located inside the connecting column, passing through both ends of the limiting port 110. A limiting post 112 is located above the connecting column. An L-shaped guide groove 113 is provided on the surface of each connecting column. The limiting post 112 is slidably positioned inside the guide groove 113, which is used to lock the limiting post 112. When worker safety is required, the two steel rings 114 of the safety cable 109 are placed in the limiting port 110. The limiting pin 111 passes through the two steel rings 114 and extends into the connecting column, thus fixing the length of the safety cable 109 and preventing accidents caused by movement. The safety cable 109 includes multiple steel rings 114 and a safety rope 115. The steel rings 114 are connected to both ends of the safety rope 115, which allows workers to perform long-distance operations and prevents falls.

[0056] In this invention, due to the safety concerns of construction workers during lifting, a guide rail 103 and a protective net 104 are set up to provide basic protection for the workers. At the same time, the safety of construction workers from falling from heights during operation also needs to be guaranteed. This invention uses a safety steel cable 109 to bind the construction workers throughout the process, meeting the needs of construction walking while protecting the workers from falling. When the workers are lifted, the connection between the limit pin 111 and the steel ring 114 locks the range of movement of the construction workers, preventing them from falling and causing accidents, thus effectively improving the safety protection capability of this device.

[0057] A method for formwork construction of a square pier, as described in another embodiment of the present invention, includes the following steps:

[0058] S1. Lifting Preparation: Set up roadblocks and assign personnel to control traffic conditions. Determine the construction location of the square pier. Position the crane at a 45-degree angle to one side of the square pier to facilitate the load-bearing of lifting blocks 105 and 106. Use four steel cables of the same length and load-bearing capacity to connect to lifting blocks 105 and 106 respectively. Set up a safety protection isolation zone 20 meters from the construction location of the square pier. Set up a template installation groove at the construction location of the square pier. Set up a hollow inner template 4. Install and pour the reinforcing steel of the base. Install the outer template 2 inside the template installation groove. Install the first layer of outer template 2 and the second layer of outer template 2 using the crane.

[0059] S2. Install protective component 1: Protective component 1 is connected to the connecting seat 210 of the first layer by high-strength bolt 203. After the first layer square pier is cast and formed, the high-strength bolt 209 is removed. The lifting blocks 105 and 106 are connected by a crane to lift the protective component 1 to the outer template 2 of the second layer. The high-strength bolt 209 connects the protective component 1 to the outer template 2 of the first layer. The high-strength bolt 303 connects the connecting steel bar 302 above the protective component 1 to the connecting seat 210 above the outer template 2 of the second layer.

[0060] S3. Operation: After the workers are lifted by the protective component 1, the next level of spiral installation of the threaded steel bars is required. At the same time, the workers need to apply release agent to the shaping surface 203 of the outer formwork 2. Before pouring, the workers return to the protective platform via the safety steel cable 109.

[0061] S4. Lifting: When the outer formwork 2 of the second layer is hoisted above the outer formwork 2 of the first layer, the inner formwork of the first layer and the inner formwork of the second layer are aligned and adjusted by manual inspection. The connecting seat 210 is connected to the rotating seat 301 of the outer formwork 2 of the second layer. The second high-strength bolt 303 is installed. The hollow inner formwork 4 is filled in by a crane. After the concrete is poured by the pump truck and the concrete layer strength reaches the standard, the first high-strength bolt 209 is removed. Steps S2 and S3 are repeated.

[0062] In step S3, during manual operation, the safety cable 109 must be worn throughout the entire process. Before the protective component 1 is lifted, the safety cable 109 needs to be fixed in the limiting port 110, and the steel ring 114 needs to be connected to the limiting pin 111. The comfort of manual wearing is adjusted by the cooperation of the limiting pin 111 and the steel ring 114.

[0063] Before construction, the site should be leveled, debris removed, and roads and drainage ensured to meet the "three connections and one leveling" conditions. Temporary water and electricity supply at the construction site should be arranged in accordance with specifications and safety requirements. Temporary protection should be set up around the site, and temporary construction equipment should be prepared. The construction work surface should be able to ensure the passage of concrete trucks and facilitate the transportation of concrete.

[0064] A detailed construction plan was formulated and strictly implemented, following the sequence of traffic control – setting up safety barriers – crane positioning – rebar installation – welding of the work platform – formwork installation – concrete pouring – completion – removal of safety barriers – lifting of traffic control. After completion, relevant data was promptly collected and compiled into a summary report. The invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of this invention.

Claims

1. A formwork flipping device for square pier construction, characterized in that: Includes protective components (1), outer template (2), and hollow inner template (4); The outer template (2) includes a fixed template (201) and an adjustable template (202). The fixed template (201) is located on both sides of the adjustable template (202). Both fixed templates (201) include a shaping surface (203) and an mounting surface (204). A slide rail (205) is provided on the mounting surface (204). The two sides of the adjustable template (202) are in contact with the shaping surface (203). The fixed template (201) and the adjustable template (202) are movably connected. The protective component (1) is installed on the periphery of the outer template (2), and the protective component (1) is slidably connected to the slide rail (205). A connecting component (3) is provided above the protective component (1), and one end of the connecting component (3) is connected to the fixed template (201). The protective component (1) includes an operating platform (101) and a protective fence. The operating platform (101) is provided with a connecting block (206) connected to the slide rail (205). A cement pouring layer (5) is filled between the hollow inner template (4) and the outer template (2). The operating platform (101) is provided with a reinforcing beam (102) on the outside. The protective fence is installed above the reinforcing beam (102). The protective fence includes multiple connecting posts and guide rails (103). The multiple connecting posts are connected above the reinforcing beam (102). The top surface of the multiple connecting posts is fixedly connected to the bottom of the guide rails (103). A protective net (104) is provided between two adjacent connecting posts. The guide rail (103) is provided with a slide rail two (107) inside, and multiple sliding seats (108) are connected inside the slide rail two (107). A safety steel cable (109) is connected above the sliding seat (108). A limiting port (110) is provided above each of the connecting columns, and a limiting pin (111) is provided inside the connecting column. The limiting pin (111) passes through the upper and lower ends of the limiting port (110). A limiting post (112) is provided above the connecting column. An L-shaped guide groove (113) is provided on the surface of each of the connecting columns, and the limiting post (112) is slidably disposed inside the guide groove (113). The connecting block (206) is slidably connected to the slide rail (205). The upper part of the slide rail (205) is provided with a connecting port (207), and the connecting block (206) is provided with a connecting port (208). A high-strength bolt (209) is inserted through the connecting port (207) and the connecting port (208). The mounting surface (204) has a plurality of connecting seats (210) at its lower part. The connecting assembly (3) includes a rotating seat (301) mounted above the operating platform (101). A connecting steel bar (302) is rotatably connected to the rotating seat (301). The other end of the connecting steel bar (302) is engaged with the connecting seat (210). A high-strength bolt (303) is used to pass through the connecting steel bar (302) and the connecting seat (210). The side of the reinforcing beam (102) is provided with multiple lifting blocks one (105), and the side of the guide rail (103) is provided with multiple lifting blocks two (106). The lifting blocks two (106) correspond one-to-one with the lifting blocks one (105), and the axial position of the lifting blocks two (106) is the same as that of the lifting blocks one (105).

2. The formwork turning device for square pier construction according to claim 1, characterized in that: The safety cable (109) includes multiple steel rings (114) and a safety rope (115), with the steel rings (114) connected to both ends of the safety rope (115).

3. A method for formwork construction of a square pier, using a formwork device for square pier construction as described in claim 2, characterized in that, Includes the following steps: S1. Lifting preparation: Set up roadblocks, set up personnel to control traffic conditions, determine the construction position of the square pier, set up the crane at a 45-degree angle on one side of the square pier, set up a safety protection isolation zone 20 meters away from the construction position of the square pier, set up a template installation groove at the construction position of the square pier, set up a hollow inner template (4), install and pour the steel reinforcement of the base, install the outer template (2) inside the template installation groove, and install the first layer of outer template (2) and the second layer of outer template (2) by crane. S2. Install protective component (1): The protective component (1) is connected to the connecting seat (210) of the first layer by high-strength bolt two (303). After the first layer square pier is cast, the high-strength bolt one (209) is removed. The crane is used to connect each of the lifting blocks one (105) and lifting blocks two (106) to lift the protective component (1) to the outer template (2) of the second layer. The high-strength bolt one (209) connects the protective component (1) to the outer template (2) of the first layer. The high-strength bolt two (303) connects the connecting steel bar (302) above the protective component (1) to the connecting seat (210) above the outer template (2) of the second layer. S3. Operation: After the manual follower is lifted by the protective component (1), the threaded steel bar needs to be installed in the next level of spiral. At the same time, the construction personnel need to apply release agent to the shaping surface (203) of the outer formwork (2). Before pouring, the construction personnel return to the protective platform through the safety steel cable (109). S4. Lifting: When the outer formwork (2) of the second layer is hoisted above the outer formwork (2) of the first layer, the inner formwork of the first layer and the inner formwork of the second layer are aligned and adjusted by manual inspection. The connecting seat (210) is connected to the rotating seat (301) of the outer formwork (2) of the second layer. The second high-strength bolt (303) is installed. The hollow inner formwork (4) is filled in by a crane. After the concrete is poured by the pump truck, the first high-strength bolt (209) is removed after the concrete layer strength reaches the standard. Steps S2 and S3 are repeated.

4. The method for formwork construction of a square pier according to claim 3, characterized in that: In step S3, when working manually, the safety cable (109) must be worn throughout the process. Before the protective component (1) is lifted, the safety cable (109) must be fixed in the limiting port (110) and the steel ring (114) must be connected to the limiting pin (111).

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