Bridge pier column section enlarging reinforcement system in narrow space and its using method

Abstract

The application discloses a reinforcing system for increasing the section of a bridge pier column in a narrow space and a use method thereof, and comprises a temporary hoisting rail system, a formwork system and a multifunctional telescopic mechanism, wherein the outer formwork for pouring concrete is divided into two layers of structures, i.e., a first formwork and a second formwork, the multifunctional telescopic mechanism at the top is used as a splicing platform, and the splicing operation is arranged at a reachable position of personnel, so that the splicing quality can be ensured, the whole outer formwork is lowered after being integrally spliced and formed by using the temporary hoisting rail system, and the problems of unreachable hoisting equipment and limited clearance are solved, meanwhile, the multifunctional telescopic mechanism provides a site convenience for the splicing of the formwork, so that most operations can be completed by the construction personnel on the support platform at the top, the multifunctional telescopic mechanism can also limit and compress the outer formwork, deformation of the outer formwork is prevented, the sealing property of the splicing joint is ensured, and the safety and construction quality of the pier column section increasing concrete construction are improved.

Description

Technical Field

[0001] This invention relates to the field of bridge reinforcement technology. More specifically, this invention relates to a system for reinforcing bridge piers by increasing their cross-section in confined spaces and its application method. Background Technology

[0002] Continuous rigid frame bridges are a common bridge structure for crossing rivers in my country. Due to limitations in technology during construction and long-term operation, various components of these bridges have developed defects requiring maintenance. The piers of continuous rigid frame bridges are the main load-bearing components, and as compression-bending members bearing horizontal thrust, defects in these components significantly impact the structural safety of the bridge. Enlarging the cross-section of the piers using UHPC (Ultra-High-Pressure Polymer) is a common maintenance and reinforcement method. Early on, many crash barriers were heavy concrete structures tightly surrounding the piers. Because the existing gap between the crash barriers and the piers was small, and the pier cross-section needed to be increased, the effective construction space between the crash barriers and the piers became even more limited, making it inaccessible to workers. Furthermore, working under existing bridges often presents challenges such as limited clearance and inaccessibility to lifting equipment. Therefore, how to complete the installation, use, and dismantling of formwork within confined spaces is a crucial factor affecting the effectiveness of pier reinforcement. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0004] Another objective of this invention is to provide a system for increasing the cross-section of bridge piers and its application method in confined spaces, in order to solve the technical problem that existing pier reinforcement construction methods cannot be applied to limited construction spaces.

[0005] To achieve these objectives and other advantages according to the invention, in one aspect, the invention provides a system for strengthening bridge piers by increasing their cross-section in confined spaces, comprising:

[0006] The temporary suspension rail system includes a first slide rail and a second slide rail fixed parallel to the bottom of the beam along the transverse direction of the bridge. The first slide rail and the second slide rail are symmetrically arranged on both sides of the pier along the transverse direction of the bridge. The second slide rail is located outside the first slide rail. A first lifting mechanism is symmetrically slidably connected to the first slide rail along the transverse direction of the bridge, and a second lifting mechanism is symmetrically slidably connected to the second slide rail along the transverse direction of the bridge.

[0007] The formwork system includes a first formwork, a second formwork, and fixed embedded parts. The fixed embedded parts are embedded in the top of the pier cap. The first formwork is used to enclose the upper section fixed outside the enlarged cross-section area of ​​the pier column, and the second formwork is used to enclose the lower section fixed outside the enlarged cross-section area of ​​the pier column. The upper end of the second formwork is detachably and sealed to the lower end of the first formwork, and the lower end of the second formwork is detachably and sealed to the fixed embedded parts. The first formwork, the second formwork, and the pier column together form a pouring space for the enlarged cross-section concrete of the pier column. The upper outer end of the first formwork is connected to the telescopic end of the first lifting mechanism, and the upper outer end of the second formwork is connected to the telescopic end of the second lifting mechanism.

[0008] The multi-functional telescopic mechanism includes a side telescopic support assembly and an inner telescopic support assembly. The side telescopic support assembly is arranged on the outer anti-collision wall of the pier and is used to push and limit the first template towards the pier. The inner telescopic support assembly is arranged on the inner anti-collision wall of the pier and is used to push and limit the first template and the second template towards the pier. The uppermost side telescopic support assembly and inner telescopic support assembly are also used as a support platform when extended.

[0009] The upper outer side of the second template is also equipped with a connector for hanging on the support platform.

[0010] Preferably, the side telescopic support assembly includes a side telescopic platform and side formwork components. The side telescopic platform is disposed on the top of the outer anti-collision wall. The side telescopic platform has a telescopic end that moves in the horizontal direction and forms an outer support platform when the telescopic end extends. The side formwork components are arranged vertically at intervals on the side of the outer anti-collision wall facing the pier. The uppermost side formwork component is hinged at one end to the telescopic end of the side telescopic platform and abuts against the outer side of the first template at the other end. The remaining side formwork components abut against the outer anti-collision wall at one end and abut against the outer side of the first template or the second template at the other end.

[0011] The inner telescopic support assembly is installed on the inner anti-collision wall and is arranged at vertical intervals. The inner telescopic support assembly has a telescopic end that moves in the horizontal direction. When the telescopic end of the uppermost inner telescopic support assembly is extended, it forms an inner support platform. The inner support platform has the same height as the outer support platform.

[0012] Preferably, the first template and the second template are respectively formed by sealing and splicing template units on the four sides along the horizontal circumferential direction.

[0013] Preferably, the adjacent template units form a vertical splice seam at the splicing point, and the fixed embedded part forms a horizontal splice seam with the adjacent template unit above at the splicing point. Rubber strips are respectively attached to the vertical splice seam and the horizontal splice seam. Magnets are arranged on the corresponding side of the rubber strip between the adjacent template units and the template unit adjacent to the fixed embedded part. The rubber strip is positioned and pressed by the magnets to form a sealed connection.

[0014] Preferably, the opposite sides of the first template and the second template extend outward vertically to form locking parts. A screw hole is provided through the locking part in the horizontal direction. The screw holes on opposite sides are coaxially arranged and a screw rod is inserted into them. The two ends of the screw rod extend out of the screw hole on the corresponding side and are locked by a nut.

[0015] Preferably, the upper end of the first template extends vertically upward to form a top support. On the top support and the lower end of the second template, demolding jacks are fixedly installed facing the pier column. The demolding jacks are driven by an external hydraulic pump and are used to automatically demold after the concrete with an enlarged cross-section of the pier column is poured.

[0016] On the other hand, the present invention also provides a system for strengthening bridge piers by increasing their cross-section in confined spaces and a method for using the same, comprising the following construction steps:

[0017] S1. Determine the design location for pouring concrete to increase the cross-section of the pier column, level the concrete on the outer side of the bottom of the design location and embed the aforementioned fixed pre-embedded parts;

[0018] S2. The support platform retracts, and the second template is lowered to the height of the connecting piece at the support platform by the second lifting mechanism. Then the support platform extends, and the second template is temporarily hung on the end of the support platform by the connecting piece.

[0019] S3. The first template is lifted above the second template by the first lifting mechanism;

[0020] S4. Securely and seal the first template and the second template to form the outer template of the pier column enlarged cross section area. The temporary lifting rail system lifts the outer template, retracts the support platform, and lowers the outer template as a whole to the design position.

[0021] S5. Using the multi-functional telescopic mechanism, push and limit the outer template, pour concrete inside the outer template, and complete the concrete curing.

[0022] S6. Retract the multi-functional telescopic mechanism to demold;

[0023] S7. The outer template is lifted as a whole to the same height as the second template and the support platform using the temporary lifting rail system. The support platform is driven to extend and the outer template is temporarily hooked by the connector. Then the connection between the first template and the second template is released. The first template is lifted and moved using the first lifting mechanism, and then the support platform is retracted. The second template is lifted and moved using the second lifting mechanism.

[0024] Preferably, the installation of the first template and the second template is performed according to the following steps:

[0025] A1. Drive the top of the side telescopic support assembly and the inner telescopic support assembly to extend to form the support platform. Use the second lifting mechanism to lift the template unit of the second template onto the side telescopic platform for splicing to form the second template.

[0026] A2. The second lifting mechanism lifts the second template and lowers it to the same height as the support platform at the top of the second template, extends out of the support platform, and temporarily hangs the second template on the support platform through the connector;

[0027] A3. The first lifting mechanism lifts the template unit of the first template onto the side telescopic platform and seals and splices it to form the first template;

[0028] A4. Connect the first template and the second template via a flange.

[0029] The present invention has at least the following beneficial effects:

[0030] (1) The bridge pier column enlargement and reinforcement system and its usage method in a narrow space of the present invention include a temporary hanging rail system, a formwork system and a multi-functional telescopic mechanism. The outer formwork used for pouring concrete is divided into two layers in terms of height: the first formwork and the second formwork. The multi-functional telescopic mechanism at the top is used as a splicing platform. The assembly operation is set in a place accessible to personnel, which can ensure the quality of the splice. After the outer formwork is assembled as a whole, it is lowered using the temporary hanging rail system, which solves the problems of inaccessibility of lifting equipment and limited clearance.

[0031] (2) The template system of the present invention uses rubber strips, magnets and a small number of screws to press at the splice joint. Compared with the existing technology of close-packed bolts for tightening, it can not only ensure that the splice joint is tight, but also facilitate the disassembly of the template when demolding. The splicing and disassembly are simpler.

[0032] (3) The present invention utilizes demolding jacks embedded in the template system for automatic demolding and demolding operation is carried out through a hydraulic pump station. No manual access to the template points is required, which reduces the difficulty of pier reinforcement construction.

[0033] (4) The multi-functional telescopic mechanism of the present invention has multiple functions, including serving as a structural installation platform, a temporary support platform for the outer formwork in the air, and an auxiliary pressing structure for the outer formwork. It provides a convenient site for the splicing of the formwork, allowing construction workers to complete most of the operations on the top support platform. After the outer formwork is installed in place, the multi-functional telescopic mechanism can also extend to contact the outer formwork, limit and press the outer formwork to prevent deformation, ensure the sealing of the splice joint, and improve the safety and construction quality of the concrete construction of the pier column with increased cross-section.

[0034] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0035] Figure 1 This is a front view structural diagram of the present invention when the first template is installed;

[0036] Figure 2 This is a front view structural diagram of the present invention when the second template is installed;

[0037] Figure 3 This is a front view structural diagram of the present invention when the first template and the second template are lowered and fixed as a whole;

[0038] Figure 4 This is a front view structural diagram of the present invention when pouring concrete to increase the cross-section of the pier column;

[0039] Figure 5 This is a front view structural diagram of the present invention when the first template and the second template are lifted and split;

[0040] Figure 6 This is a front view of the present invention when the second template is removed;

[0041] Figure 7 For the present invention Figure 4 Top view of the template system;

[0042] The following are the reference numerals in the accompanying drawings: 1. Temporary hoisting rail system; 2. First template; 3. Second template; 4. Fixed embedded part; 5. Inner telescopic support assembly; 6. Side telescopic support assembly; 7. Side telescopic platform; 8. Side formwork component; 9. Vertical splice joint; 10. Screw; 11. Demolding jack; 12. Pier column; 13. Outer crash barrier; 14. Inner crash barrier; 15. Pier column enlarged cross-section. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0044] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0045] like Figure 1-7 As shown, the present invention provides a system for strengthening bridge piers by increasing their cross-section in confined spaces, comprising:

[0046] The temporary suspension rail system 1 includes a first slide rail and a second slide rail fixed parallel to the bottom of the beam along the transverse direction of the bridge. The first slide rail and the second slide rail are symmetrically arranged on both sides of the pier 12 along the transverse direction of the bridge. The second slide rail is located outside the first slide rail. A first lifting mechanism is symmetrically slidably connected to the first slide rail along the transverse direction of the bridge, and a second lifting mechanism is symmetrically slidably connected to the second slide rail along the transverse direction of the bridge.

[0047] The template system includes a first template 2, a second template 3, and a fixed embedded part 4. The fixed embedded part 4 is embedded in the top of the pier cap. The first template 2 is used to enclose the upper section fixed outside the area of ​​the enlarged section 15 of the pier column, and the second template 3 is used to enclose the lower section fixed outside the area of ​​the enlarged section 15 of the pier column. The upper end of the second template 3 is detachably and sealed to the lower end of the first template 2, and the lower end of the second template 3 is detachably and sealed to the fixed embedded part 4. The first template 2, the second template 3, and the pier column 12 together form a pouring space for the concrete of the enlarged section 15 of the pier column. The upper outer end of the first template 2 is connected to the telescopic end of the first lifting mechanism, and the upper outer end of the second template 3 is connected to the telescopic end of the second lifting mechanism.

[0048] The multi-functional telescopic mechanism includes a side telescopic support assembly 6 and an inner telescopic support assembly 5. The side telescopic support assembly 6 is arranged on the outer anti-collision wall 13 of the pier 12 and is used to push and limit the first template 2 towards the pier 12. The inner telescopic support assembly 5 is arranged on the inner anti-collision wall 14 of the pier 12 and is used to push and limit the first template 2 and the second template 3 towards the pier 12. The uppermost side telescopic support assembly 6 and inner telescopic support assembly 5 are also used as a support platform when extended.

[0049] The upper outer side of the second template 3 is also provided with a connector for hanging on the support platform.

[0050] The bridge pier reinforcement system for confined spaces of this invention is designed for construction conditions with limited space and insufficient clearance. It divides the formwork system into two parts vertically, making it particularly suitable for the reinforcement of double piers 12. A temporary hanging system is temporarily fixed at the bottom of the main beam for lifting and moving the first formwork 2 and the second formwork 3. The multi-functional telescopic mechanism can serve as a clamping structure after the formwork system is installed. The uppermost side telescopic support component 6 and inner telescopic support component 5 can also be connected with the connectors to serve as temporary support structures for the second formwork 3 when extended. The top side telescopic support component 6 can also serve as a working platform for assembling the construction structure and can be used to install the required enclosure structure on the outer anti-collision wall 13. The first and second lifting mechanisms can be equipped with electric hoists or other devices.

[0051] The formwork system is designed based on the increased cross-section and inclination of the pier 12 on the inner side of the crash barrier. During construction, the first formwork 2 and the second formwork 3 are first lifted and lowered using the temporary hoisting rail system 1. The multi-functional telescopic mechanism at the top serves as a support platform for construction. The first formwork 2 and the second formwork 3 are then assembled and connected to form an integral outer formwork. During connection, it is ensured that the sealing meets the requirements and that the structure is aligned and stable. Afterward, the multi-functional telescopic mechanism is retracted to avoid obstructing the downward movement path of the outer formwork. After the outer formwork is assembled as a whole, it is lowered. The assembly work is set in a place accessible to personnel to ensure the quality of the joints. After the outer formwork is lowered into place, it is securely connected to the fixed embedded parts 4. Magnets or other clamping measures can be used to ensure good sealing. At this time, the multi-functional telescopic mechanism extends to the outside of the outer formwork as needed to limit and clamp the outer formwork. Then, the concrete construction pier column is poured to increase the cross section by 15, which helps to place the outer formwork in case of deformation or gaps during the concrete pouring process. After the concrete construction is completed, the outer formwork is ready for removal. After demolding, the multi-functional telescopic mechanism is retracted, and the first and second lifting mechanisms lift the outer formwork. During this period, the multi-functional telescopic mechanism is used as a temporary support platform to facilitate the segmented disassembly of the outer formwork. Then, the first formwork 2 and the second formwork 3 are removed in sequence and moved using the corresponding lifting mechanisms.

[0052] In another technical solution, such as Figure 1-7 As shown, the side telescopic support assembly 6 includes a side telescopic platform 7 and a side formwork component 8. The side telescopic platform 7 is set on the top of the outer anti-collision wall 13. The side telescopic platform 7 has a telescopic end that moves in the horizontal direction and forms an outer support platform when the telescopic end is extended. The side formwork components 8 are arranged vertically at intervals on the side of the outer anti-collision wall 13 facing the pier 12. The uppermost side formwork component 8 is hinged at one end to the telescopic end of the side telescopic platform 7 and abuts against the outer side of the first template 2 at the other end. The remaining side formwork components 8 abut against the outer anti-collision wall 13 at one end and abut against the outer side of the first template 2 or the second template 3 at the other end.

[0053] The inner telescopic support assembly 5 is installed on the inner anti-collision wall 14 and is arranged at intervals along the vertical direction. The inner telescopic support assembly 5 has a telescopic end that moves in the horizontal direction. When the uppermost telescopic end of the inner telescopic support assembly 5 is extended, it forms an inner support platform. The inner support platform has the same height as the outer support platform.

[0054] For construction conditions where the space between the pier 12 and the crash barrier is limited, a side telescopic platform 7 is set on the top of the crash barrier surrounding the pier 12 to provide a construction platform for the installation, dismantling, and assembly of the formwork. At the same time, when the telescopic end of the side telescopic platform 7 is extended, it can still serve as a limiting and clamping structure for the external formwork. For the crash barrier inside the pier 12, an internal telescopic support component 5, such as a telescopic cylinder, is pre-installed inside the crash barrier and connected to an external hydraulic drive device for operation. The top internal support platform and the external support platform can jointly support the first formwork 2 or the second formwork 3 or the integrated external formwork. For inclined external formwork, the side telescopic support component 6 and the internal telescopic support component 5 can also press the external formwork downward.

[0055] In another technical solution, such as Figure 1 , 3 As shown, the first template 2 and the second template 3 are respectively assembled by installing template units on the four sides on the support platform and sealing them together in a horizontal circumferential direction.

[0056] In another technical solution, such as Figure 1 As shown, adjacent template units form a vertical splicing seam 9 at the splicing point, and the fixed embedded part 4 forms a horizontal splicing seam with the adjacent template unit above it at the splicing point. Rubber strips are respectively attached to the vertical splicing seam 9 and the horizontal splicing seam. Magnets are arranged on the corresponding side of the rubber strip between adjacent template units and on the template unit adjacent to the fixed embedded part 4. The rubber strip is positioned and pressed by the magnets to form a sealed connection.

[0057] The fixed embedded part 4 is a steel plate embedded part. The structure at the splice joint is mainly composed of rubber strips and magnets. The rubber strip is a sealing component. The magnet mainly serves to initially position and press the template unit at the corresponding vertical splice joint 9 or horizontal splice joint, which can ensure that the splice joint is tight and facilitate the disassembly of the template during demolding.

[0058] In another technical solution, such as Figure 1 As shown, the opposite sides of the first template 2 and the second template 3 extend outward vertically to form locking parts. A screw hole is opened through the locking part in the horizontal direction. The screw holes on opposite sides are coaxially arranged and a screw 10 is inserted into them. The two ends of the screw 10 extend out of the screw hole on the corresponding side and are locked by a nut.

[0059] The template units are first sealed by pressing the rubber strips with magnets between them or between them and the fixed embedded parts 4. Then, a second tightening is performed by inserting and tightening long screws 10 on both sides of the opposite template units to further improve the tightness of the joint. The fit between the screws 10 and the nuts also facilitates the subsequent removal of the template system. Compared with the existing technology of close-packed bolt tightening, the jointing and unjoining are much simpler.

[0060] In another technical solution, such as Figure 2-7 As shown, the upper end of the first template 2 extends vertically upward to form a top support. Demolding jacks 11 are fixedly installed on the top support and at the lower end of the second template 3, respectively, facing the pier column 12. The demolding jacks 11 are embedded in the first template 2 and the second template 3. Driven by an external hydraulic pump, the demolding jacks 11 are used for automatic demolding after the concrete with an enlarged cross-section 15 of the pier column is poured. By using the demolding jacks 11 embedded at the top and bottom of the templates for automatic reverse demolding, the problem of personnel inaccessibility during demolding can be solved.

[0061] This invention also provides a method for using a bridge pier reinforcement system with enlarged cross-section in confined spaces, combined with... Figure 1-7 As shown, the construction steps include the following:

[0062] S1. Determine the design location for pouring concrete with an increased cross-section of 15mm in the pier column, level the concrete on the outer side of the bottom of the design location and embed the fixed pre-embedded part 4.

[0063] S2, Combination Figure 2 As shown, the support platform retracts, and the second template 3 is lowered to the height of the connecting piece at the support platform by the second lifting mechanism. Then, the support platform extends, and the second template 3 is temporarily hung on the end of the support platform by the connecting piece.

[0064] S3, Combination Figure 3 As shown, the first template 2 is lifted above the second template 3 by the first lifting mechanism;

[0065] S4, Combination Figure 4 As shown, the first template 2 and the second template 3 are fastened and sealed together to form the outer template of the pier column enlarged section 15 area. The temporary lifting rail system 1 lifts the outer template, retracts the support platform, and lowers the outer template as a whole to the design position.

[0066] S5, Combination Figure 4-5 As shown, the multi-functional telescopic mechanism is used to push and limit the outer template, and concrete is poured inside the outer template to complete the concrete curing.

[0067] S6, Combination Figure 5As shown, the multi-functional telescopic mechanism retracts, and the mold is demolded;

[0068] S7, Combination Figure 6-7 As shown, the outer template is lifted as a whole to the same height as the second template 3 and the support platform by the temporary lifting rail system 1, the support platform is driven to extend, and the outer template is temporarily hung by the connector. Then, the connection between the first template 2 and the second template 3 is released, the first template 2 is lifted and moved by the first lifting mechanism, the support platform is retracted, and the second template 3 is lifted and moved by the second lifting mechanism.

[0069] Furthermore, when installing the first template 2 and the second template 3, in combination Figure 2-4 Follow these steps:

[0070] A1. Drive the top of the side telescopic support assembly 6 and the inner telescopic support assembly 5 to extend to form the support platform. Use the second lifting mechanism to lift the template unit of the second template 3 onto the side telescopic platform 7 for splicing to form the second template 3.

[0071] A2. The second lifting mechanism lifts the second template 3 and lowers it to the upper end of the second template 3 at the same height as the support platform, extends out of the support platform, and temporarily hangs the second template 3 on the support platform through the connector;

[0072] A3. The first lifting mechanism lifts the template unit of the first template 2 onto the side telescopic platform 7 and seals and splices it to form the first template 2;

[0073] A4. Connect the first template 2 and the second template 3 via a flange.

[0074] Specifically, when installing or removing the screw 10, after positioning and splicing using the rubber strip and the magnet, the screw 10 is inserted into the screw holes of the template units on both sides and locked. Then, the outer template is lowered. Before demolding, the screw 10 is released on the side where the inner anti-collision wall 14 is located, and then the outer template is demolded, lifted and moved.

[0075] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A system for increasing the cross-section of bridge piers and reinforcing them in confined spaces, characterized in that, include: The temporary suspension rail system includes a first slide rail and a second slide rail fixed parallel to the bottom of the beam along the transverse direction of the bridge. The first slide rail and the second slide rail are symmetrically arranged on both sides of the pier along the transverse direction of the bridge. The second slide rail is located outside the first slide rail. A first lifting mechanism is symmetrically slidably connected to the first slide rail along the transverse direction of the bridge, and a second lifting mechanism is symmetrically slidably connected to the second slide rail along the transverse direction of the bridge. The formwork system includes a first formwork, a second formwork, and fixed embedded parts. The fixed embedded parts are embedded in the top of the pier cap. The first formwork is used to enclose the upper section fixed outside the enlarged cross-section area of ​​the pier column, and the second formwork is used to enclose the lower section fixed outside the enlarged cross-section area of ​​the pier column. The upper end of the second formwork is detachably and sealed to the lower end of the first formwork, and the lower end of the second formwork is detachably and sealed to the fixed embedded parts. The first formwork, the second formwork, and the pier column together form a pouring space for the enlarged cross-section concrete of the pier column. The upper outer end of the first formwork is connected to the telescopic end of the first lifting mechanism, and the upper outer end of the second formwork is connected to the telescopic end of the second lifting mechanism. The multi-functional telescopic mechanism includes a side telescopic support assembly and an inner telescopic support assembly. The side telescopic support assembly is arranged on the outer anti-collision wall of the pier and is used to push and limit the first template towards the pier. The inner telescopic support assembly is arranged on the inner anti-collision wall of the pier and is used to push and limit the first template and the second template towards the pier. The uppermost side telescopic support assembly and inner telescopic support assembly are also used as a support platform when extended. The upper outer side of the second template is also equipped with a connector for hanging on the support platform.

2. The bridge pier reinforcement system for enlarging the cross-section in a confined space as described in claim 1, characterized in that, The side telescopic support assembly includes a side telescopic platform and side formwork components. The side telescopic platform is set on the top of the outer anti-collision wall. The side telescopic platform has a telescopic end that moves in the horizontal direction and forms an outer support platform when the telescopic end is extended. The side formwork components are arranged vertically at intervals on the side of the outer anti-collision wall facing the pier. The uppermost side formwork component is hinged at one end to the telescopic end of the side telescopic platform and abuts against the outer side of the first template at the other end. The remaining side formwork components abut against the outer anti-collision wall at one end and abut against the outer side of the first template or the second template at the other end. The inner telescopic support assembly is installed on the inner anti-collision wall and is arranged at vertical intervals. The inner telescopic support assembly has a telescopic end that moves in the horizontal direction. When the telescopic end of the uppermost inner telescopic support assembly is extended, it forms an inner support platform. The inner support platform has the same height as the outer support platform.

3. The bridge pier reinforcement system for enlarging the cross-section in a confined space as described in claim 2, characterized in that, The first template and the second template are respectively formed by sealing and splicing template units on four sides along the horizontal circumferential direction.

4. The bridge pier reinforcement system for enlarging the cross-section in a confined space as described in claim 3, characterized in that, The adjacent template units form a vertical splice seam at the splicing point, and the fixed embedded part forms a horizontal splice seam with the adjacent template unit above at the splicing point. Rubber strips are respectively attached to the vertical splice seam and the horizontal splice seam. Magnets are arranged on the corresponding side of the rubber strip between the adjacent template units and the template unit adjacent to the fixed embedded part. The rubber strip is positioned and pressed by the magnets to form a sealed connection.

5. The bridge pier reinforcement system for enlarging the cross-section in a confined space as described in claim 4, characterized in that, The first template and the second template extend vertically outward from their opposite sides to form locking parts. A screw hole is provided through the locking part in the horizontal direction. The screw holes on opposite sides are coaxially arranged and a screw rod is inserted into them. The two ends of the screw rod extend out of the screw hole on the corresponding side and are locked by a nut.

6. The bridge pier reinforcement system for enlarging the cross-section in a confined space as described in claim 1, characterized in that, The upper end of the first template extends vertically upward to form a top support. On the top support and the lower end of the second template, demolding jacks are fixedly installed facing the pier column. The demolding jacks are driven by an external hydraulic pump and are used to automatically demold after the concrete with an enlarged cross-section of the pier column is poured.

7. The method of using the bridge pier section enlargement and reinforcement system in a confined space as described in claim 3, characterized in that, The construction steps include the following: S1. Determine the design location for pouring concrete to increase the cross-section of the pier column, level the concrete on the outer side of the bottom of the design location and embed the aforementioned fixed pre-embedded parts; S2. The support platform retracts, and the second template is lowered to the height of the connecting piece at the support platform by the second lifting mechanism. Then the support platform extends, and the second template is temporarily hung on the end of the support platform by the connecting piece. S3. The first template is lifted above the second template by the first lifting mechanism; S4. Securely and seal the first template and the second template to form the outer template of the pier column enlarged cross section area. The temporary lifting rail system lifts the outer template, retracts the support platform, and lowers the outer template as a whole to the design position. S5. Using the multi-functional telescopic mechanism, push and limit the outer template, pour concrete inside the outer template, and complete the concrete curing. S6. Retract the multi-functional telescopic mechanism to demold; S7. The outer template is lifted as a whole to the same height as the second template and the support platform using the temporary lifting rail system. The support platform is driven to extend and the outer template is temporarily hooked by the connector. Then the connection between the first template and the second template is released. The first template is lifted and moved using the first lifting mechanism, and then the support platform is retracted. The second template is lifted and moved using the second lifting mechanism.

8. The method of using the bridge pier section enlargement and reinforcement system in a confined space as described in claim 7, characterized in that, When installing the first template and the second template, follow these steps: A1. Drive the top of the side telescopic support assembly and the inner telescopic support assembly to extend to form the support platform. Use the second lifting mechanism to lift the template unit of the second template onto the side telescopic platform for splicing to form the second template. A2. The second lifting mechanism lifts the second template and lowers it to the same height as the support platform at the top of the second template, extends out of the support platform, and temporarily hangs the second template on the support platform through the connector; A3. The first lifting mechanism lifts the template unit of the first template onto the side telescopic platform and seals and splices it to form the first template; A4. Connect the first template and the second template via a flange.

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