Minimum spacing separated thin-wall pier formwork and its application

Abstract

The present application discloses a very small spacing separated thin-walled pier formwork and its application, belonging to the field of building construction, which includes a pedestal, an inner bracket, an outer bracket, a plurality of outer formworks and an inner formwork, wherein the pedestal is fixedly arranged on the ground, the outer bracket is fixedly installed on the ground and is located around the pedestal, the inner bracket is installed on the pedestal, the outer formwork and the inner formwork are installed on the pedestal, two adjacent outer formworks or two adjacent inner formworks are connected to each other, and a casting cavity is formed between the outer formwork and the inner formwork; the outer bracket is provided with a plurality of driving mechanisms for driving the outer formwork to move, the inner bracket is also provided with a plurality of driving mechanisms for driving the inner formwork to move, and a plurality of supporting components for supporting the outer formwork and the inner formwork are provided between the outer formwork and the inner formwork. The present application has the effect of simplifying the installation of the formwork and shortening the construction period.

Description

Technical Field

[0001] The present application relates to the field of building construction technology, and in particular to extremely small spacing separated thin-wall pier formwork and applications thereof. Background Art

[0002] Thin-walled piers are mainly divided into three categories: reinforced concrete thin-walled piers, double-walled piers and V-shaped piers. The common point is that their transverse length is the same as other forms of piers, but their longitudinal length is very small. They have the advantages of saving materials, reducing the deadweight of the bridge, and increasing the stiffness of the piers.

[0003] Separate thin-walled piers have been widely used in highway, bridge and other projects due to their advantages of light weight, high construction efficiency and flexible connection methods. Especially in the design of high bridge piers, separate thin-walled piers can reduce the deadweight and cross-sectional area of ​​the piers, and improve the spanning capacity and economic benefits of the bridge.

[0004] With the continuous development of bridge engineering technology, the design and construction technology of separated thin-walled piers are also constantly improving. During the construction of thin-walled piers, there are generally construction methods such as sliding formwork construction, climbing formwork construction and flip formwork construction. These construction methods require repeated construction and disassembly of formwork, and the use of cranes to transport the formwork upwards. When the crane drives the formwork, the formwork will continue to shake, and manual adjustments are required to the installation position. The construction steps are complicated, resulting in a significant increase in construction time. Summary of the invention

[0005] In order to simplify the installation of the formwork and shorten the construction period, the present application provides an extremely small spacing separated thin-wall pier formwork and its application.

[0006] The extremely small spacing separated thin-walled pier formwork and its application provided in this application adopt the following technical solutions: The extremely small spacing separated thin-walled pier formwork includes a pedestal, an inner bracket, an outer bracket, multiple outer formworks and an inner formwork, the pedestal is fixedly arranged on the ground, the outer bracket is fixedly installed on the ground and is located around the pedestal, the inner bracket is installed on the pedestal, the outer formwork and the inner formwork are installed on the pedestal, two adjacent outer formworks or two adjacent inner formworks are connected to each other, and a casting cavity is formed between the outer formwork and the inner formwork; the outer bracket is provided with multiple groups of driving mechanisms for driving the outer formwork to move, and the inner bracket is also provided with multiple groups of driving mechanisms for driving the inner formwork to move, and multiple groups of supporting components for supporting the outer formwork and the inner formwork are arranged between the outer formwork and the inner formwork.

[0007] By adopting the above technical scheme, after the pedestal is poured, the staff starts to install the inner bracket and the outer bracket. The staff installs the outer bracket around the pedestal, and installs the outer formwork and the inner formwork on the outer bracket and the inner bracket respectively through the driving mechanism. Then, multiple inner formworks are connected to each other to form an inner frame, and multiple outer formworks are connected to each other to form an outer frame, and a casting cavity is formed between the outer frame and the inner frame; the staff ties steel bars and pours concrete in the casting cavity, and multiple groups of support components can support and fix the inner formwork and the outer formwork to each other, so as to avoid the inner formwork or the outer formwork from moving due to the impact force of concrete when pouring concrete; after the first section of concrete solidifies, the staff removes the support components between the inner formwork and the outer formwork, and then the staff drives the inner formwork and the outer formwork to move upward synchronously through multiple groups of driving mechanisms, and continues to pour after assembling the support components again. The pouring is done upward section by section, and there is no need for manual or crane to adjust the position of the formwork, thereby simplifying the construction steps, shortening the construction time, and accelerating the construction efficiency.

[0008] Preferably, the supporting assembly includes bolts, nuts and connecting pipes, the inner template and the outer template are both provided with a plurality of connecting holes, the connecting holes on the inner template and the outer template are arranged in one-to-one correspondence, the connecting pipe is inserted into the connecting hole, and is located in the casting cavity, with its two ends respectively abutting against the opposite side walls of the inner template and the outer template, the bolt is passed through the connecting pipe, and its two ends respectively extend out of the outer template and the inner template, the nut is threadedly connected to both ends of the bolt, and is respectively tightly abutted against the inner template and the outer template.

[0009] By adopting the above technical solution, when pouring concrete, the two ends of the connecting pipe are respectively abutted against the opposite side walls of the inner formwork and the outer formwork, and the nuts at both ends of the bolt are tightly abutted against the outer side wall of the outer formwork and the side wall of the inner formwork away from the outer formwork, thereby limiting the movement of the outer formwork and the inner formwork. Multiple groups of support components improve the stability of the outer formwork and the inner formwork and reduce the impact of the concrete impact force.

[0010] Preferably, the driving mechanism includes a plurality of rotating rods and a plurality of screw rods, and the plurality of rotating rods and the plurality of screw rods are arranged in a one-to-one correspondence, and the plurality of rotating rods are evenly rotated and distributed on the outer bracket, the screw rod is detachably connected to the rotating rod, and a slider is threadedly connected to the screw rod, and a plurality of guide rods are detachably provided on the outer bracket, and the slider slides on the guide rod; the slider is detachably connected to the outer template, and the driving mechanism also includes a driving component for driving the rotating rod to rotate.

[0011] By adopting the above technical solution, when the concrete poured last time solidifies and the staff removes the supporting assembly, the staff drives the rotating rod to rotate through the driving assembly, the rotation of the rotating rod drives the screw rod to rotate, the rotation of the screw rod drives the slider to move upward, and the upward movement of the slider drives the outer formwork to move upward to the next pouring position.

[0012] Preferably, the driving assembly includes a motor, a worm wheel and a worm, the worm wheel is fixedly sleeved on the rotating rod, the motor is fixedly mounted on the outer bracket, the worm is fixedly connected to the rotating shaft of the motor, and the worm and the worm wheel are meshed.

[0013] By adopting the above technical solution, the staff starts the motor, the motor starts to drive the worm to rotate, the rotation of the worm drives the worm wheel to rotate, the rotation of the worm wheel drives the rotating rod to rotate, thereby rotating the screw.

[0014] Preferably, a plug-in slot is provided on the rotating rod, an internal thread is provided on the inner wall of the plug-in slot, the screw rod is threadedly connected to the inner wall of the plug-in slot, a connecting block is fixedly connected to the screw rod, the connecting block abuts against the rotating rod, and the connecting block and the rotating rod are fixedly connected by bolts.

[0015] By adopting the above technical solution, when the construction is completed, the staff will dismantle the external bracket and remove the screw rod from the rotating rod. After the screw rod is disassembled, it can be transported and stored separately, so as to avoid the screw rod being too high to affect the transportation and storage of the equipment.

[0016] Preferably, a fixing column is fixedly connected to the outer template, a connecting groove is provided on the fixing column, a fixing rod is fixedly connected to the sliding block, a screw is threadedly connected to the fixing rod, and one end of the screw away from the fixing rod is threadedly connected to the inner wall of the connecting groove; a first socket is provided on the fixing column, the first socket is connected to the connecting groove, a second socket is provided on the screw, the first socket and the second socket are aligned, and a plug rod is inserted into the first socket and the second socket.

[0017] By adopting the above technical solution, the staff extends the screw into the connecting groove by rotating the screw, and at the same time, it is threadedly connected to the inner wall of the connecting groove. Subsequently, the staff fixes the screw by inserting a rod to limit the rotation of the screw, thereby strengthening the connection strength between the slider and the outer template.

[0018] Preferably, a first magnetic sheet is provided on the cross-section of the left and right ends of the outer template, grooves are provided on the two adjacent ends of the outer template respectively, and a second magnetic sheet is provided on the inner wall of the groove, and the first magnetic sheet abuts against the groove and attracts the second magnetic sheet to each other.

[0019] By adopting the above technical solution, when multiple outer formworks are abutted against each other to form a frame, adjacent outer formworks are attracted and abutted against each other under the action of magnetic force, thereby improving the stability of the connection between the outer formworks. The groove setting can reduce the possibility of concrete leakage from the connection gap.

[0020] Preferably, a release agent is evenly applied on the opposite side walls of the outer template and the inner template.

[0021] By adopting the above technical solution, the release agent helps to demould the concrete and prevents the outer formwork or the inner formwork from sticking to the concrete.

[0022] Preferably, S1, a worker first casts the pedestal; after the pedestal solidifies, the inner bracket and the inner template are installed; S2, after the inner binding steel bars are taken out for pouring, the outer bracket and the outer formwork are installed; S3, connecting the inner formwork and the outer formwork through the support assembly; S4, pouring concrete and waiting for the concrete to solidify; S5. After the concrete solidifies, the staff continues to tie the steel bars upwards, removes the support assembly, and moves the inner formwork and the outer formwork upwards through the driving mechanism; S6. After installing the support assembly again, pour concrete, repeat the steps, and pour the bridge pier upwards section by section.

[0023] By adopting the above technical solution, the outer formwork and the inner formwork are moved section by section by the driving mechanism for pouring section by section, which can improve the efficiency of concrete pouring, simplify the installation of the formwork and improve the construction efficiency.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the pedestal is poured, the staff begins to install the inner and outer brackets. The staff installs the outer bracket around the pedestal, and installs the outer formwork and the inner formwork on the outer bracket and the inner bracket respectively through the driving mechanism. Then, multiple inner formworks are connected to each other to form an inner frame, and multiple outer formworks are connected to each other to form an outer frame, and a casting cavity is formed between the outer frame and the inner frame; the staff ties steel bars and pours concrete in the casting cavity. Multiple groups of support components can support and fix the inner and outer formworks to each other to prevent the inner or outer formworks from moving due to the impact force of concrete when pouring concrete; after the first section of concrete solidifies, the staff removes the support components between the inner and outer formworks, and then the staff drives the inner and outer formworks to move upward synchronously through multiple groups of driving mechanisms, and continues to pour after assembling the support components again. The casting is done section by section upward, and there is no need for manual or crane to adjust the position of the formwork, thereby simplifying the construction steps, shortening the construction time, and accelerating the construction efficiency; 2. When pouring concrete, the two ends of the connecting pipe are respectively in contact with the opposite side walls of the inner and outer formworks, and the nuts at both ends of the bolts are pressed against the outer side wall of the outer formwork and the side wall of the inner formwork away from the outer formwork, thereby limiting the movement of the outer and inner formworks. Multiple sets of support components improve the stability of the outer and inner formworks and reduce the impact of concrete impact force; 3. When the concrete poured last time solidifies and the staff removes the supporting assembly, the staff drives the rotating rod to rotate through the driving assembly. The rotation of the rotating rod drives the screw rod to rotate. The rotation of the screw rod drives the slider to move upward. The upward movement of the slider drives the outer formwork to move upward to the next pouring position. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the thin-walled pier formwork of an embodiment of the present application.

[0026] Figure 2 It is an overall top view of the thin-walled pier formwork of an embodiment of the present application.

[0027] Figure 3 This is an enlarged view of point A in Figure 1.

[0028] Figure 4 This is an enlarged view of Figure B.

[0029] Description of reference numerals: 1. Base; 2. Inner bracket; 3. Outer bracket; 4. Outer template; 5. Inner template; 6. Casting cavity; 7. Driving mechanism; 8. Support assembly; 9. Bolt; 10. Nut; 11. Connecting pipe; 12. Connecting hole; 13. Rotating rod; 14. Screw; 15. Guide rod; 16. Slider; 17. Driving assembly; 18. Motor; 19. Worm gear; 20. Worm; 21. Plug-in slot; 22. Connecting block; 23. Fixed column; 24. Connecting slot; 25. Fixed rod; 26. Screw; 27. Insert rod; 28. First magnetic sheet; 29. ​​Groove; 30. Second magnetic sheet. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The embodiment of the present application discloses a very small spacing separated thin-walled pier formwork, such as Figure 1 and Figure 2As shown, it includes a pedestal 1, an inner bracket 2, an outer bracket 3, four outer templates 4 and four inner templates 5. The staff is now pouring the pedestal 1 at the predetermined position of the pier. The outer bracket 3 is fixedly installed on the ground and is located around the pedestal 1. The inner bracket 2 is installed on the upper end surface of the pedestal 1. The four inner templates 5 are mutually abutted to form an inner frame. The four outer templates 4 are mutually abutted to form an outer frame. A pouring cavity 6 is formed between the inner frame and the outer frame. The outer templates 4 and the inner templates 5 are evenly coated with a release agent on the opposite side walls. The release agent helps to demould the concrete and prevent the outer templates 4 or the inner templates 5 from sticking to the concrete. In this embodiment, the installation and drive of the outer templates 4 and the inner templates 5 are consistent, and the outer template 4 is used as an example. The first magnetic sheet 28 is fixedly installed on the side walls of the two ends of the outer templates 4 on the left and right sides. The outer templates 4 at the front and rear ends are provided with grooves 29 for the adjacent outer templates 4 to be plugged in. The inner wall of the groove 29 is provided with a second magnetic sheet. The first magnetic sheet 28 abuts against the groove 29 and attracts the second magnetic sheet. When the staff abuts the four outer formworks 4 to form a frame, the adjacent outer formworks 4 are attracted and abutted against each other under the action of magnetic force, thereby improving the stability of the connection between the outer formworks 4. The setting of the groove 29 can reduce the possibility of concrete leakage from the connection gap.

[0032] like Figure 1 and Figure 2 As shown, the outer bracket 3 is provided with multiple sets of driving mechanisms 7 for driving the outer template 4 to move, and multiple sets of supporting components 8 for supporting the outer template 4 and the inner template 5 are provided between the outer template 4 and the inner template 5. Multiple connecting holes 12 are provided on each outer template 4 and the inner template 5, and the connecting holes 12 on the inner template 5 and the outer template 4 are arranged in a one-to-one correspondence. The supporting component 8 includes a bolt 9, a nut 10 and a connecting pipe 11. The connecting pipe 11 is inserted into the connecting hole 12, and is located in the casting cavity 6, and its two ends are respectively abutted against the opposite side walls of the inner template 5 and the outer template 4. The bolt 9 is penetrated in the connecting pipe 11, and its two ends extend out of the outer template 4 and the inner template 5 respectively. The nut 10 is threadedly connected to the two ends of the bolt 9, and is respectively pressed against the inner template 5 and the outer template 4. When pouring concrete, the two ends of the connecting pipe 11 are respectively abutted against the opposite side walls of the inner formwork 5 and the outer formwork 4, and the nuts 10 at both ends of the bolt 9 are tightly pressed against the outer side wall of the outer formwork 4 and the side wall of the inner formwork 5 away from the outer formwork 4, thereby limiting the movement of the outer formwork 4 and the inner formwork 5. The multiple groups of support components 8 improve the stability of the outer formwork 4 and the inner formwork 5 and reduce the impact of the concrete impact force.

[0033] like Figure 1 and Figure 3As shown, the driving mechanism 7 includes a plurality of rotating rods 13 and a plurality of screw rods 14, and the plurality of rotating rods 13 and the plurality of screw rods 14 are arranged one by one. At least two rotating rods 13 are arranged on each side of the outer bracket 3, and the rotating rods 13 rotate on the outer bracket 3. The screw rods 14 are detachably connected to the rotating rods 13. The driving mechanism 7 also includes a driving assembly 17 for driving the rotating rods 13 to rotate. The driving assembly 17 includes a motor 18, a worm wheel 19 and a worm 20. The worm wheel 19 is fixedly sleeved on the rotating rod 13, the motor 18 is fixedly mounted on the outer bracket 3, the worm 20 is fixedly connected to the rotating shaft of the motor 18, and the worm 20 and the worm wheel 19 are meshed. When the outer template 4 needs to be moved, the staff starts the motor 18, the motor 18 starts to drive the worm 20 to rotate, the worm 20 rotates to drive the worm wheel 19 to rotate, and the worm wheel 19 rotates to drive the rotating rod 13 to rotate, thereby rotating the screw rod 14. The staff drives the motors 18 on the outer support 3 and the inner support 2 at the same time, and synchronously drives the inner template 5 and the outer template 4 to move upward together, thereby avoiding deviation in the movement of the inner template 5 and the outer template 4.

[0034] like Figure 1 and Figure 3 As shown, the rotating rod 13 is provided with a plug-in slot 21 in the vertical direction, and an internal thread is provided on the inner wall of the plug-in slot 21. The bottom end of the screw rod 14 is threadedly connected to the inner wall of the plug-in slot 21. A connecting block 22 is fixedly welded on the side wall of the screw rod 14. The lower end surface of the connecting block 22 abuts against the upper end surface of the rotating rod 13. The connecting block 22 and the rotating rod 13 are fixedly connected by bolts 9. At least two sliders 16 are threadedly connected to each screw rod 14. The sliders 16 are detachably connected to the outer template 4. A guide rod 15 is installed next to each screw rod 14. The guide rod 15 is detachably connected to the outer bracket 3. The slider 16 is penetrated and slides on the guide rod 15. The staff fixedly connects the screw rod 14 and the rotating rod 13 together through the threaded connection and the fixing of the bolt 9. When the driving assembly 17 is driven to rotate, the rotating rod 13 drives the screw rod 14 to rotate together, thereby driving the slider 16 to move with the outer template 4. When the construction is completed, the staff will remove the screw rod 14 from the rotating rod 13, the guide rod 15 from the bracket, and the slider 16 from the outer template 4. The disassembled structure can be transported and stored separately to avoid the screw rod 14 being too high to affect the transportation and storage of the equipment.

[0035] like Figure 1 and Figure 4As shown, a plurality of fixing columns 23 are fixedly welded on the outer surface of the outer template 4. The fixing columns 23 are cylindrical, and the axis is perpendicular to the outer template 4 in the horizontal direction. A connecting groove 24 is opened in the horizontal direction on the end surface of the fixing column 23 away from the outer template 4. A fixing rod 25 is fixedly welded on the side of the slider 16 close to the outer template 4. A screw 26 is threadedly connected to the end of the fixing rod 25 away from the slider 16. The end of the screw 26 away from the fixing rod 25 is threadedly connected to the inner wall of the connecting groove 24. The staff extends the screw 26 into the connecting groove 24 by rotating the screw 26, and at the same time, the screw is threadedly connected to the inner wall of the connecting groove 24. Subsequently, the staff fixes the screw 26 by inserting the rod 27 into the first and second sockets to limit the rotation of the screw 26, thereby strengthening the connection strength between the slider 16 and the outer template 4.

[0036] like Figure 1 and Figure 2 As shown, the application method of the above-mentioned extremely small spacing separated thin-walled pier formwork is as follows: S1. The staff first pours the pedestal 1; after the pedestal 1 solidifies, the inner bracket 2 and the inner formwork 5 are installed; S2, after the inner binding steel bars are taken out for pouring, the outer bracket 3 and the outer formwork 4 are installed; S3, connecting the inner formwork 5 and the outer formwork 4 through the support assembly 8; S4, pouring concrete and waiting for the concrete to solidify; S5. After the concrete solidifies, the staff continues to tie the steel bars upwards, removes the support assembly 8, and moves the inner formwork 5 and the outer formwork 4 upwards through the driving mechanism 7; S6. Install the support assembly 8 again and pour concrete. Repeat the steps to pour the bridge pier upwards section by section.

[0037] The implementation principle of the embodiment of the present application is as follows: after the pedestal 1 is poured, the staff starts to install the inner support 2 and the outer support 3. The staff installs the outer support 3 around the pedestal 1, and installs the outer formwork 4 and the inner formwork 5 on the outer support 3 and the inner support 2 respectively through the driving mechanism 7, and then connects multiple inner formworks 5 to form an inner frame, and connects multiple outer formworks 4 to form an outer frame, and a pouring cavity 6 is formed between the outer frame and the inner frame; the staff ties steel bars and pours concrete in the pouring cavity 6, and multiple groups of support assemblies 8 can support and fix the inner formwork 5 and the outer formwork 4 to each other, so as to avoid the inner formwork 5 or the outer formwork 4 from moving due to the impact force of the concrete when pouring concrete; after the first section of concrete solidifies, the staff removes the support assembly 8 between the inner formwork 5 and the outer formwork 4, and then the staff drives the inner formwork 5 and the outer formwork 4 to move upward synchronously through the multiple groups of driving mechanisms 7, and continues to pour after assembling the support assembly 8 again, and pours upward section by section, without the need for manual or crane to adjust the position of the formwork, thereby simplifying the construction steps, shortening the construction time, and accelerating the construction efficiency.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. Very small spacing separated thin-wall pier formwork, characterized by: The invention comprises a pedestal (1), an inner support (2), an outer support (3), a plurality of outer templates (4) and an inner template (5); the pedestal (1) is fixedly arranged on the ground; the outer support (3) is fixedly installed on the ground and is located around the pedestal (1); the inner support (2) is installed on the pedestal (1); the outer template (4) and the inner template (5) are installed on the pedestal (1); two adjacent outer templates (4) or two adjacent inner templates (5) are connected to each other; a casting cavity (6) is formed between the outer template (4) and the inner template (5); the outer support (3) is provided with a plurality of driving mechanisms (7) for driving the outer template (4) to move; the inner support (2) is also provided with a plurality of driving mechanisms (7) for driving the inner template (5) to move; and a plurality of supporting components (8) for supporting the outer template (4) and the inner template (5) are provided between the outer template (4) and the inner template (5).

2. The extremely small spacing separated thin-walled pier formwork according to claim 1 is characterized in that: The support assembly (8) comprises a bolt (9), a nut (10) and a connecting pipe (11). The inner template (5) and the outer template (4) are both provided with a plurality of connecting holes (12). The connecting holes (12) on the inner template (5) and the outer template (4) are arranged in a one-to-one correspondence. The connecting pipe (11) is inserted into the connecting hole (12) and is located in the casting cavity (6). Its two ends are respectively abutted against the opposite side walls of the inner template (5) and the outer template (4). The bolt (9) is passed through the connecting pipe (11) and its two ends are respectively extended out of the outer template (4) and the inner template (5). The nut (10) is threadedly connected to the two ends of the bolt (9) and is respectively pressed against the inner template (5) and the outer template (4).

3. The extremely small spacing separated thin-walled pier formwork according to claim 1 is characterized in that: The driving mechanism (7) comprises a plurality of rotating rods (13) and a plurality of screw rods (14), wherein the plurality of rotating rods (13) and the plurality of screw rods (14) are arranged in a one-to-one correspondence, and the plurality of rotating rods (13) are evenly rotated and distributed on the outer bracket (3), the screw rods (14) are detachably connected to the rotating rods (13), a slider (16) is threadedly connected to the screw rods (14), a plurality of guide rods (15) are detachably provided on the outer bracket (3), and the slider (16) slides on the guide rods (15); the slider (16) is detachably connected to the outer template (4), and the driving mechanism (7) further comprises a driving assembly (17) for driving the rotating rods (13) to rotate.

4. The extremely small spacing separated thin-walled pier formwork according to claim 3 is characterized by: The driving assembly (17) comprises a motor (18), a worm wheel (19) and a worm (20); the worm wheel (19) is fixedly sleeved on the rotating rod (13); the motor (18) is fixedly mounted on the outer bracket (3); the worm (20) is fixedly connected to the rotating shaft of the motor (18); and the worm (20) and the worm wheel (19) are meshed.

5. The extremely small spacing separated thin-walled pier formwork according to claim 3 is characterized by: The rotating rod (13) is provided with an inserting groove (21), the inner wall of the inserting groove (21) is provided with an internal thread, the screw rod (14) is threadedly connected to the inner wall of the inserting groove (21), the screw rod (14) is fixedly connected with a connecting block (22), the connecting block (22) abuts against the rotating rod (13), and the connecting block (22) and the rotating rod (13) are fixedly connected by bolts (9).

6. The extremely small spacing separated thin-walled pier formwork according to claim 3 is characterized by: A fixing column (23) is fixedly connected to the outer template (4), a connecting groove (24) is provided on the fixing column (23), a fixing rod (25) is fixedly connected to the sliding block (16), a screw rod (26) is threadedly connected to the fixing rod (25), and one end of the screw rod (26) away from the fixing rod (25) is threadedly connected to the inner wall of the connecting groove (24); a first plug hole is provided on the fixing column (23), the first plug hole is connected to the connecting groove (24), a second plug hole is provided on the screw rod (26), the first plug hole is aligned with the second plug hole, and an insertion rod (27) is inserted into the first plug hole and the second plug hole.

7. The extremely small spacing separated thin-walled pier formwork according to claim 1 is characterized by: A first magnetic sheet (28) is arranged on the cross-sections at the left and right ends of the outer template (4), and grooves (29) are arranged on the two adjacent ends of the outer template (4). A second magnetic sheet is arranged on the inner wall of the groove (29), and the first magnetic sheet (28) abuts against the groove (29) and attracts the second magnetic sheet.

8. The extremely small spacing separated thin-walled pier formwork according to claim 1 is characterized by: A release agent is evenly applied on the opposite side walls of the outer template (4) and the inner template (5).

9. The application method of the extremely small spacing separated thin-walled pier formwork according to claims 1 to 8 is characterized in that: S1. The staff first casts the pedestal (1); after the pedestal (1) solidifies, the inner bracket (2) and the inner template (5) are installed; S2, after the inner binding steel bars are taken out for pouring, the outer bracket (3) and the outer formwork (4) are installed; S3, connecting the inner formwork (5) and the outer formwork (4) via the support assembly (8); S4, pouring concrete and waiting for the concrete to solidify; S5. After the concrete solidifies, the staff continues to tie the steel bars upwards, removes the support assembly (8), and moves the inner formwork (5) and the outer formwork (4) upwards through the driving mechanism (7); S6. Install the support assembly (8) again and pour concrete, repeat the steps, and pour the bridge pier upwards section by section.

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