Support platform for variable cross-section bridge pier body construction

Abstract

The invention relates to a support platform for variable cross-section bridge pier body construction, which comprises a jacking mechanism, an outer template assembly, an inner template assembly and a lifting assembly, and the jacking mechanism surrounds the outer vertical surface of a pier and can climb along the outer vertical surface of the pier; the outer formwork assembly is arranged in a formwork lifting channel between the jacking mechanism and the outer vertical face of the pier, the outer formwork assembly is composed of a plurality of first outer formworks and second outer formworks which are oppositely arranged, and the first formworks abut against the second formworks in a sliding mode; the inner formwork assembly comprises an inner formwork support, a telescopic driving part and a plurality of inner formworks, a pouring space is formed among the first inner formwork, the second inner formwork, the first outer formwork and the second outer formwork, and the first telescopic driving part can drive the first inner formwork to be close to or away from the inner formwork support so as to reduce or enlarge the pouring space; the lifting assembly is arranged on the jacking mechanism and used for lifting the height of the inner formwork assembly and the height of the outer formwork assembly. The construction method has the effect of improving the construction efficiency and the construction safety of the variable cross-section pier.

Description

Technical Field

[0001] The present application relates to the field of bridge construction, and particularly to a support platform for the construction of variable cross-section bridge piers. Background Art

[0002] Bridge piers are an indispensable part of bridge engineering. They are buildings that support the bridge span structure and transfer the dead load and vehicle live load to the foundation. Bridge piers mainly consist of a top cap and a pier body. Common pier bodies are generally divided into two types: equal cross-section and variable cross-section. The cross-sectional shape and size of an equal cross-section pier remain unchanged in the height direction of the pier body, and its structure is simple and the construction is convenient; while the cross-sectional shape and size of a variable cross-section pier change in the height direction of the pier body. The variable cross-section design can better adapt to different structural requirements and load distributions, improving the economy and aesthetics of the bridge. It is mainly applied to mountain expressways and higher bridges. However, during the construction process of variable cross-section piers, special formwork and construction techniques are usually required to ensure the structural stability and construction safety.

[0003] In the related art, a Chinese patent with the publication number CN115492369B discloses an integral variable cross-section hollow pier climbing formwork, including: a plurality of climbing frame structures arranged circumferentially around the hollow pier. Each of the plurality of climbing frame structures includes an inner formwork, an outer formwork, an upper climbing formwork body, and a lower climbing formwork body. The inner formwork and the outer formwork are arranged face to face. The inner formwork is located inside the hollow pier, and the outer formwork is located outside the hollow pier; one side of the outer formwork away from the inner formwork is connected to the upper climbing formwork body, and the outer formwork can slide along a first direction on the upper climbing formwork body. The first direction is parallel to the plane where the outer formwork is located and perpendicular to the climbing direction of the lower climbing formwork body; the upper climbing formwork body is slidably arranged on the top end of the lower climbing formwork body. The lower climbing formwork body is used to connect with the hollow pier, and the upper climbing formwork body can drive the outer formwork to slide along a second direction on the top end of the lower climbing formwork body. The second direction is the perpendicular direction of the plane where the outer formwork is located; an anti-falling rod is fixed on the upper climbing formwork body and / or the lower climbing formwork body; the anti-falling rod of any one climbing frame structure is slidably arranged with the anti-falling rod of an adjacent climbing frame structure through a first connecting piece, and the anti-falling rod can slide along its length direction; the first connecting piece includes a base plate and two connecting frames. The two connecting frames are respectively fixed on both sides of the base plate, and the connecting frames are used to sleeved outside the anti-falling rod; an opening is arranged on one side of the connecting frame away from the base plate; when there are four or more anti-falling rods, two anti-falling rods arranged face to face are connected through a third connecting piece.

[0004] In view of the above related art, after each section of the bridge pier is poured, it is necessary to manually remove the inner formwork, then move the inner formwork upward and install it in a new position. Since the hollow pier has a variable cross-section, as it moves upward, the inner space of the hollow pier becomes smaller and smaller, resulting in the disassembly and assembly of the inner formwork being too cumbersome and having certain safety hazards, seriously reducing the construction efficiency and construction safety. Summary of the Invention

[0005] In order to improve the construction efficiency and construction safety of variable cross-section bridge piers, the present application provides a support platform for the construction of variable cross-section bridge piers.

[0006] The support platform for the construction of variable cross-section bridge piers provided by the present application adopts the following technical solutions: A support platform for the construction of variable cross-section bridge piers includes a jacking mechanism. The jacking mechanism surrounds the outer surface of the bridge pier and can climb along the outer surface of the bridge pier as the height of the already cast section of the bridge pier increases. A formwork lifting channel is provided between the jacking mechanism and the outer surface of the bridge pier. An outer formwork assembly is arranged in the formwork lifting channel. The outer formwork assembly includes at least two oppositely arranged first outer formworks and at least two oppositely arranged second outer formworks. The two side edges of the first outer formwork are respectively slidably abutted against the casting surfaces of at least two oppositely arranged second outer formworks. An inner formwork assembly is arranged in the inner cavity of the bridge pier. The inner formwork assembly includes an inner formwork support, a first telescopic driving member, at least two first inner formworks arranged face to face, and at least four second inner formworks. The inner formwork support is arranged in the inner cavity of the bridge pier. The first telescopic driving member is installed on the inner formwork support. The two first inner formworks are respectively fixed at both ends of the first telescopic driving member. One side of the second inner formwork is hinged to the side edge of the first inner formwork. A relief space for the movement of the second inner formwork is reserved between two adjacent second inner formworks. A second telescopic driving member for driving the second inner formwork to flip is provided between the second inner formwork and the first inner formwork. A casting space is formed between the first inner formwork, the second inner formwork, the first outer formwork and the second outer formwork. An activity formwork is provided on the casting surface of the second inner formwork. The activity formworks of adjacent second inner formworks are stacked to isolate the casting space and the relief space. The first telescopic driving member can drive the first inner formwork to approach or move away from the inner formwork support to reduce or expand the casting space. A lifting assembly is arranged on the jacking mechanism. The lifting assembly can rise with the jacking mechanism to be used for lifting the heights of the inner formwork assembly and the outer formwork assembly.

[0007] By adopting the above technical solution, the support platform can effectively solve the problems of inconvenient formwork adjustment, low construction efficiency, and poor construction safety during the construction of variable cross-section bridge piers in the prior art. Specifically, the jacking mechanism can climb along the outer facade of the pier as the height of the already-poured section of the pier increases, ensuring the continuity and stability during the construction process, reducing the workload of frequent formwork disassembly and assembly, and improving the construction efficiency; the outer formwork assembly includes multiple first outer formworks and second outer formworks, and through sliding cooperation, it can flexibly adjust the position on a pier where the width of the pier remains unchanged but the thickness of the pier changes with the height of the pier, meeting the requirements of variable cross-section and ensuring the pouring quality; the inner formwork assembly realizes the position adjustment of the inner formwork through the first telescopic driving member and the second telescopic driving member, enabling the pouring space to be enlarged or reduced as needed to adapt to the variable cross-section requirements of a pier where the width of the pier remains unchanged but the thickness of the pier changes with the height of the pier; the lifting assembly is arranged on the jacking mechanism and can rise synchronously with the jacking mechanism, ensuring the rapid and accurate height adjustment of the inner formwork assembly and the outer formwork assembly, and further improving the construction efficiency. In summary, through the integrated functions of jacking, formwork adjustment, and lifting, the support platform significantly improves the flexibility and efficiency of the construction of variable cross-section bridge piers, reduces the construction cost, and improves the construction efficiency and construction safety.

[0008] Optionally, the jacking mechanism includes a jacking driving member, a jacking top-section truss, and a jacking bottom-section truss arranged on the pier. The bottom end of the jacking top-section truss is slidably connected to the top end of the jacking bottom-section truss through the jacking driving member. When the jacking top-section truss is fixed to the outer facade of the pier, the jacking driving member can lift the height of the jacking bottom-section truss, and when the jacking bottom-section truss is fixed to the outer facade of the pier, the jacking driving member can lift the height of the jacking top-section truss.

[0009] By adopting the above technical solution, the jacking mechanism can achieve precise positioning and lifting at different heights of the pier. Specifically, the jacking driving member can flexibly adjust the heights of the jacking top-section truss and the jacking bottom-section truss, enabling the jacking mechanism to climb smoothly when the height of the already-poured section of the pier changes; this design not only improves the construction efficiency but also ensures the safety and stability during the construction process; at the same time, the structural design of the jacking mechanism keeps the formwork lifting channel unobstructed, facilitating the lifting and movement of the outer formwork assembly.

[0010] Optionally, the lifting assembly includes a lifting gantry. The lifting gantry includes a gantry frame slidably arranged on the jacking top-section truss and a jib slidably arranged on the gantry frame. The sliding direction of the gantry frame on the jacking top-section truss is inclined to the sliding direction of the jib on the gantry crane.

[0011] By adopting the above technical solution, the design of the lifting mechanism is improved to enable the lifting components to adjust their positions more flexibly to meet the requirements under different construction conditions. Specifically, the boom can slide flexibly above the inner formwork components and the outer formwork components for easy lifting, and better control the lifting accuracy of the inner formwork components and the outer formwork components to ensure that the formwork components are accurately positioned, thereby improving the construction efficiency and quality.

[0012] Optionally, the lifting components include a plurality of third telescopic driving members and a plurality of fourth telescopic driving members provided on the top lifting truss section. The inner formwork support is connected to the top lifting truss section. The output end of the third telescopic driving member is connected to the first outer formwork and is used to drive the first outer formwork away from or close to the outer facade of the pier. The output end of the fourth telescopic driving member is connected to the second outer formwork and is used to drive the first outer formwork away from or close to the outer facade of the pier.

[0013] By adopting the above technical solution, the design of the third telescopic driving member and the fourth telescopic driving member enables the inner formwork components and the outer formwork components to climb synchronously with the top lifting truss section, thereby ensuring that during the construction process at different heights, the formwork can be automatically demolded and the position can be adjusted without manual participation, improving the construction efficiency and safety. At the same time, this design can also flexibly adjust the distance between the inner and outer formworks and the outer facade of the pier to meet the construction requirements of bridge piers with different cross-sectional sizes.

[0014] Optionally, the top lifting truss section includes at least two large-plane trusses and a small-plane truss. The two large-plane trusses are arranged face to face. The large-plane trusses are arranged on the side of the first outer formwork away from the casting surface. The small-plane truss is slidably arranged on the two large-plane trusses. The sliding direction of the small-plane truss is parallel to the casting surface of the second outer formwork.

[0015] By adopting the above technical solution, as the thickness of the pier changes, the size of the top lifting truss section can be adjusted accordingly to ensure the stability and adaptability of the entire support platform. Specifically, when the thickness of the pier decreases, the position of the large-plane truss and the small-plane truss can be adjusted to reduce the size of the top lifting truss section to match the actual size of the pier, ensuring the safe and reliable operation of the support platform.

[0016] Optionally, it further includes a sliding drive assembly for driving the small-plane truss to slide. The sliding drive assembly includes a drive motor, a driving gear, and a driven rack. The drive motor is fixed on the large-plane truss. The output rotating shaft of the drive motor is fixedly connected to the driving gear. The driven rack is arranged on the small-plane truss and meshes with the driving gear. The extending direction of the driven rack is parallel to the sliding direction of the small-plane truss.

[0017] By adopting the above technical solution, precise sliding control of the small face truss can be achieved. Specifically, the driving motor is fixed on the large face truss and is fixedly connected to the driving gear through the output shaft, thereby transmitting power to the driving gear; the driving gear is engaged with the driven rack set on the small face truss, so that the driven rack moves parallel to its extension direction under the drive of the driving motor. This design not only improves the stability and accuracy of the sliding of the small face truss, but also simplifies the mechanical structure, reduces maintenance costs, and improves the work efficiency and safety of the entire support platform.

[0018] Optionally, a flip platform is provided on the jacking top section truss, and the flip platform includes a fixed plate and a flip plate. The fixed plate is laid flat on the jacking top section truss, and one side of the flip plate is hinged to a side of the fixed plate close to the inner formwork assembly. When the flip plate is folded relative to the fixed plate, the end of the flip plate facing away from the fixed plate moves away from or close to the outer formwork assembly.

[0019] By adopting the above technical solution, the design of the flip platform enables construction workers to flexibly adjust the working surface at different positions, thereby improving construction efficiency and safety. Specifically, the flip plate can be folded relative to the fixed plate. When it is necessary to operate close to the inner formwork assembly, the flip plate can be unfolded to increase the working area; when it is not needed, the flip plate can be folded up to reduce the occupied space and facilitate the movement and operation of other construction equipment. This design not only improves the flexibility of construction, but also enhances the safety of construction, avoiding safety hazards caused by a narrow working surface.

[0020] Optionally, a first roller is provided on a side of the outer facade of the pier close to the top section truss of the jacking, and a second roller is provided on a side of the outer facade of the pier close to the bottom section truss of the jacking, and the first roller and the second roller roll and abut against the outer facade of the pier.

[0021] By adopting the above technical solution, the first roller and the second roller respectively arranged on the jacking top section truss and the jacking bottom section truss can roll on the outer surface of the pier, thereby reducing the friction between the jacking mechanism and the outer surface of the pier during the climbing process, improving the climbing efficiency and stability, and at the same time effectively dispersing the pressure of the jacking mechanism on the pier and protecting the surface of the pier from damage.

[0022] Optionally, a protective frame is provided around the top surface of the lifting top section truss to prevent people from falling.

[0023] By adopting the above technical solution, the protective frame can effectively prevent workers from accidentally falling during the construction process, thereby improving construction safety.

[0024] Optionally, it also includes a climbing spine, one end of which is arranged in the pier and the other end protrudes from the facade of the pier and is connected to the jacking mechanism.

[0025] By adopting the above technical solutions, the climbing vertebra mainly provides a stable anchor point for the jacking mechanism to climb on the bridge pier, ensuring that the jacking mechanism can climb step by step along the outer facade of the bridge pier safely and reliably, so as to effectively support the lifting operation of the entire support platform.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The support platform can effectively solve the problems of inconvenient formwork adjustment, low construction efficiency, and poor construction safety during the construction of variable cross-section bridge piers in the prior art. Specifically, the jacking mechanism can climb along the outer facade of the bridge pier as the height of the already cast section of the bridge pier increases, ensuring the continuity and stability during the construction process, reducing the workload of frequent disassembly and assembly of the formwork, and improving the construction efficiency; the outer formwork assembly includes multiple first outer formworks and second outer formworks, and through sliding cooperation, it can flexibly adjust its position on the bridge pier where the width of the bridge pier remains unchanged but the thickness of the bridge pier changes with the height of the bridge pier, meeting the requirements of variable cross-sections and ensuring the pouring quality; the inner formwork assembly adjusts the position of the inner formwork through the first telescopic driving member and the second telescopic driving member, enabling the pouring space to be enlarged or reduced as needed to meet the variable cross-section requirements of the bridge pier where the width of the bridge pier remains unchanged but the thickness of the bridge pier changes with the height of the bridge pier; the lifting assembly is arranged on the jacking mechanism and can rise synchronously with the jacking mechanism, ensuring the rapid and accurate height adjustment of the inner formwork assembly and the outer formwork assembly, and further improving the construction efficiency. In summary, through the integrated functions of jacking, formwork adjustment, and lifting, the support platform significantly improves the flexibility and efficiency of the construction of variable cross-section bridge piers, reduces the construction cost, and improves the construction efficiency and construction safety; 2. The jacking mechanism can achieve precise positioning and lifting at different heights of the bridge pier. Specifically, the jacking driving member can flexibly adjust the heights of the jacking top-section truss and the jacking bottom-section truss, enabling the jacking mechanism to climb smoothly when the height of the already cast section of the bridge pier changes; this design not only improves the construction efficiency but also ensures the safety and stability during the construction process; at the same time, the structural design of the jacking mechanism keeps the formwork lifting channel unobstructed, facilitating the lifting and movement of the outer formwork assembly; 3. The design of the lifting gantry enables the lifting assembly to adjust its position more flexibly to meet the requirements under different construction conditions. Specifically, the boom can be flexibly slid above the inner formwork assembly and the outer formwork assembly for easy lifting, and better control the lifting accuracy of the inner formwork assembly and the outer formwork assembly, ensuring that the formwork assembly is accurately in place, thereby improving the construction efficiency and quality; 4. By adopting the above technical solutions, the design of the third telescopic driving member and the fourth telescopic driving member enables the inner formwork assembly and the outer formwork assembly to climb synchronously with the jacking top joint truss, thereby ensuring that during the construction process at different heights, the formwork can be automatically demoulded and the position can be adjusted without manual participation, improving the construction efficiency and safety; at the same time, this design can also flexibly adjust the distance between the inner and outer formworks and the outer facade of the bridge pier to meet the construction requirements of bridge piers with different cross-sectional dimensions. Brief Description of the Drawings

[0027] Figure 1 is the left half-sectional view of Embodiment 1 of the present application.

[0028] Figure 2 In [the figure], S1 - S4 are respectively the schematic diagrams of the completion of the casting of the previous segment, the schematic diagram of the lifting assembly lifting the formwork to the next segment, the schematic diagram of the jacking of the jacking top joint truss, and the schematic diagram of the jacking of the jacking bottom joint truss.

[0029] Figure 3 is the top view of the formwork closing state of Embodiment 1 of the present application.

[0030] Figure 4 is the top view of the formwork stripping state of Embodiment 1 of the present application.

[0031] Figure 5 is the front half-sectional view of Embodiment 1 of the present application.

[0032] Figure 6 is Figure 5 the partial enlarged view of part A in [the figure].

[0033] Figure 7 is the top view of Embodiment 2 of the present application.

[0034] Figure 8 is the front half-sectional view of Embodiment 2 of the present application.

[0035] Figure 9 is the left half-sectional view of Embodiment 2 of the present application.

[0036] Description of reference numerals: 100, bridge pier; 1, jacking mechanism; 11, jacking drive member; 12, top jacking truss; 121, large surface truss; 122, small surface truss; 123, first roller; 13, bottom jacking truss; 131, second roller; 2, outer formwork assembly; 21, first outer formwork; 22, second outer formwork; 3, inner formwork assembly; 31, inner formwork support; 32, first telescopic drive member; 33, first inner formwork; 34, second inner formwork; 35, movable formwork; 36, second telescopic drive member; 4, lifting assembly; 41, lifting gantry; 411, gantry frame; 412, jib; 42, third telescopic drive member; 43, fourth telescopic drive member; 5, sliding drive assembly; 51, drive motor; 52, driving gear; 53, driven rack; 6, flipping platform; 61, fixing plate; 62, flipping plate; 7, protective frame; 8, climbing cone; 9, connecting truss. Detailed implementation manners

[0037] The following further elaborates on this application Figures 1-9 in conjunction with the attached drawings.

[0038] The embodiment of this application discloses a support platform for the construction of variable cross-section bridge piers.

[0039] Embodiment 1 Referring to Figure 1 and Figure 2 in this embodiment, the support platform includes a jacking mechanism 1, an outer formwork assembly 2, an inner formwork assembly 3, and a lifting assembly 4.

[0040] Specifically, the jacking mechanism 1 includes a jacking drive member 11, and a top jacking truss 12 and a bottom jacking truss 13 provided on the bridge pier 100. Both the top jacking truss 12 and the bottom jacking truss 13 are made of high-strength steel to ensure their structural strength and stability. The bottom end of the top jacking truss 12 is slidably connected to the top end of the bottom jacking truss 13 through the jacking drive member 11. The bottom jacking truss 13 is located inside the top jacking truss 12. The bottom of the bottom jacking truss 13 and the bottom end of the top jacking truss 12 both abut against the outer facade of the bridge pier 100. When the top jacking truss 12 is fixed to the outer facade of the bridge pier 100, the jacking drive member 11 can lift the height of the bottom jacking truss 13. When the bottom jacking truss 13 is fixed to the outer facade of the bridge pier 100, the jacking drive member 11 can lift the height of the top jacking truss 12. The jacking drive member 11 can be a hydraulic cylinder or an electric push rod, and the specific selection depends on the power supply conditions and working environment at the construction site. In other embodiments, the jacking drive member 11 can also be selected as a gear cooperating with a rack.

[0041] Referring to Figure 3 and Figure 4In this embodiment, the outer formwork assembly 2 includes a first outer formwork 21 and a second outer formwork 22. There are two first outer formworks 21 and two second outer formworks 22 in each casting section. The two first outer formworks 21 are parallel to each other, and the two second outer formworks 22 are parallel to each other. The casting surfaces of the two first outer formworks 21 and the two second outer formworks 22 are perpendicular to each other. The two sides of the two first outer formworks 21 are respectively slidably abutted on the casting surfaces of the two second outer formworks 22. A tie rod is provided at the abutment between the first outer formwork 21 and the second outer formwork 22 to lock the spliced ​​formworks to ensure the sealing between the formworks and to prevent concrete leakage. In other embodiments, the number of the first outer formworks 21 and the second outer formworks 22 in each casting section can be adjusted as needed; the first outer formworks 21 and the second outer formworks 22 can be slidably connected through a slide rail and a slider.

[0042] Reference Figure 1 and Figure 3 In this embodiment, the inner formwork assembly 3 includes an inner formwork support 31, a first telescopic driving member 32, a first inner formwork 33 and a second inner formwork 34. There are two first inner formworks 33 and four second inner formworks 34 in each casting section. The inner formwork support 31 is made of high-strength steel and is arranged in the inner cavity of the pier 100 to play a supporting role. The first telescopic driving member 32 can be a double-headed hydraulic cylinder or a double-headed pneumatic cylinder. The first telescopic driving member 32 is used to drive the movement of the first inner formwork 33. The first telescopic driving member 32 is welded to the inner formwork support 31 and the output end of the first telescopic driving member 32 is perpendicular to the first inner formwork 33. The two first inner formworks 33 are arranged face to face and parallel to the two first outer formworks 21 respectively. The two output ends of the first telescopic driving member 32 respectively abut against the sides of the two first inner formworks 33 away from the casting surface.

[0043] The two sides of each first inner template 33 are respectively connected to two back-to-back second inner templates 34 by hinges, and the hinges are made of corrosion-resistant materials to ensure reliability and flexibility after long-term use; a second telescopic driving member 36 is provided between the second inner template 34 and the first inner template 33, which is used to drive the second inner template 34 to flip away from or close to the casting surface of the second outer template 22, and the two ends of the second telescopic driving member 36 are respectively hinged to the second inner template 34 and the first inner template 33, and the second telescopic driving member 36 can select a hydraulic cylinder or a pneumatic cylinder, and the specific selection depends on the actual needs on site. In other embodiments, the number of first inner templates 33 and second inner templates 34 in each casting section can be adjusted as needed.

[0044] Reference Figure 4In this embodiment, an escape space is reserved between two adjacent second inner templates 34 for the second inner templates 34 to flip and move; a casting space is formed between the first inner template 33, the second inner template 34, the first outer template 21, and the second outer template 22; a movable template 35 is provided on the casting surface of the second inner template 34, and the movable template 35 and the second inner template 34 are an integrated structure. The movable templates 35 of the adjacent second inner templates 34 on the same side are stacked to isolate the casting space and the escape space, ensuring that the concrete will not enter the escape space during the casting process, affecting the casting quality and construction progress; the first telescopic driving member 32 can drive the two first inner templates 33 to move closer to or away from the inner template support 31 to reduce or expand the casting space. In other embodiments, the movable template 35 and the second inner template 34 can adopt a split structure and be connected by a connector.

[0045] Reference Figure 5 In this embodiment, the lifting component 4 includes a lifting gantry 41, and the lifting gantry 41 includes a gantry 411 and a boom 412. The gantry 411 and the boom 412 are made of high-strength alloy steel to ensure their structural strength and stability; the lifting top section truss 12 is provided with a slide groove parallel to the second outer template 22, the gantry 411 is parallel to the first outer template 21 and is slidably set in the slide groove on the lifting top section truss 12, the boom 412 is slidably set on the gantry 411 and at the height of the lifting inner template assembly 3 and the outer template assembly 2, the boom 412 can be simultaneously displaced horizontally or longitudinally in the horizontal direction to move the top of the inner template assembly 3 or the outer template assembly 2 for easy lifting.

[0046] Reference Figure 5 In this embodiment, the lifting top section truss 12 includes two large face trusses 121 arranged face to face and two small face trusses 122 arranged in parallel. The large face trusses 121 and the small face trusses 122 are both made of high-strength steel to ensure their structural strength; the large face trusses 121 are parallel to the casting surface of the first outer formwork 21 and are arranged on the side of the casting surface away from the first outer formwork 21; the two small face trusses 122 are respectively slidably penetrated at both ends of the two large face trusses 121, and the sliding direction of the small face trusses 122 is parallel to the casting surface of the second outer formwork 22; a construction space is formed between the two small face trusses 122 and the two large face trusses 121, and the spacing between the two large face trusses 121 can be adjusted according to the required changes in the cross-section of the pier 100 to adjust the size of the construction space to suit the construction needs. In other embodiments, the number of large-surface trusses 121 and small-surface trusses 122 can be adjusted according to demand. The large-surface trusses 121 can also be arranged parallel to the casting surface of the second outer formwork 22 , and the large-surface trusses 121 are slidably arranged at both ends of the small-surface trusses 122 .

[0047] Reference Figure 5 and Figure 6, in this embodiment, the support platform further includes a sliding drive assembly 5 for driving the sliding of the small surface truss 122. The sliding drive assembly 5 includes a drive motor 51, a driving gear 52 and a driven rack 53. The number of the drive motors 51 and the driving gears 52 is four sets, which are respectively arranged at both ends of the two large surface trusses 121. The number of the driven racks 53 is two, which are respectively arranged on the two small surface trusses 122. The drive motor 51 is fixed to the end of the large surface truss 121, the output rotating shaft of the drive motor 51 is fixedly connected with the driving gear 52, the driven rack 53 is welded on the small surface truss 122 and extends along the sliding direction parallel to the small surface truss 122, and the driving gear 52 is in precise meshing with the driven rack 53. The drive motor 51 drives the driving gear 52 to rotate to drive the small surface truss 122 to slide on the large surface truss 121 to adjust the distance between the two large surface trusses 121.

[0048] Preferably, the drive motor 51 is a high-torque low-speed motor to ensure its stable operation under heavy load. The driving gear 52 and the driven rack 53 are made of high-strength wear-resistant materials to ensure the reliability of their long-term use, making the large surface truss 121 and the small surface truss 122 more stable during the adjustment process and reducing the casting quality problems caused by position deviation. In addition, the sliding drive assembly 5 can also be controlled by programming to achieve automatic adjustment, further improving the construction efficiency.

[0049] Refer to Figure 5 and Figure 6 , in this embodiment, a flipping platform 6 is provided on one side of the jacking top truss 12 close to the formwork lifting channel. The flipping platform 6 includes a fixing plate 61 and a flipping plate 62. The fixing plate 61 is laid flat and welded on the jacking top truss 12. One end of the flipping plate 62 is hinged to the fixing plate 61 on the side close to the formwork lifting channel through a hinge. A slider is slidably clamped on the flipping plate 62, and the sliding direction of the slider is perpendicular to the second outer formwork 22. One end of the slider is hinged to a connecting rod through a hinge, and the other end of the connecting rod is hinged to the side of the jacking top truss 12 close to the formwork lifting channel through a hinge. When the slider slides to the end close to the pier 100, the flipping plate 62 is parallel to the fixing plate 61. When the slider slides to the end close to the jacking top truss 12, the flipping plate 62 can be flipped upwards to be perpendicular to the fixing plate 61. Preferably, when demoulding, in order to facilitate the lifting of the outer formwork assembly 2, the flipping plate 62 can be flipped to be perpendicular to the fixing plate 61. When closing the formwork, in order to facilitate the pouring operation, the flipping plate 62 can be flipped to be parallel to the fixing plate 61. In other embodiments, the fixing plate 61 can be fixed to the jacking top truss 12 by bolts.

[0050] Refer to Figure 1, in this embodiment, a first roller 123 is provided on the outer facade side of the jacking top truss 12 close to the pier 100, and a second roller 131 is provided on the outer facade side of the jacking bottom truss 13 close to the pier 100. The first roller 123 and the second roller 131 are in rolling contact with the outer facade of the pier 100 to facilitate the frictional force between the jacking top truss 12 and the jacking bottom truss 13 and the pier 100 during climbing; the first roller 123 and the second roller 131 are made of high-strength wear-resistant materials, with a smooth surface and bearings inside to ensure smooth rotation without obstruction.

[0051] Refer to Figure 1 , in this embodiment, a protective frame 7 for preventing personnel from falling is provided around the top surface of the jacking top truss 12; the protective frame 7 is made of high-strength steel and has a height of 80 cm, and is fixed around the top surface of the jacking top truss 12 to ensure the safety of construction workers; the protective frame 7 effectively prevents construction workers from accidentally falling during high-altitude operations and improves the safety of construction. In other embodiments, the height and width of the protective frame 7 can be adjusted according to actual construction requirements to adapt to the construction requirements of piers 100 with different heights and widths Refer to Figure 1 , in this embodiment, the support platform further includes climbing cones 8. The climbing cones 8 are pre-embedded in the pouring space when pouring the pier 100 segments. One end of the climbing cone 8 is located inside the pier 100 and the other end protrudes from the outer facade of the pier 100 close to the pouring surface side of the first outer formwork 21 and is threadedly connected to the jacking top truss 12 or the jacking bottom truss 13. The jacking top truss 12 or the jacking bottom truss 13 can be used to lift the height by connecting the climbing cones 8 of different height pier 100 segments.

[0052] The implementation principle of Embodiment 1 is as follows: Through the collaborative action of the jacking mechanism 1 and the lifting assembly 4, the automatic lifting of the outer formwork assembly 2 and the inner formwork assembly 3 and the adjustment of the pouring space size are realized, which can adapt to the construction of variable-section bridge piers 100, reduce manual intervention, and improve construction efficiency and safety. The double-layer truss design and sliding connection method of the jacking mechanism 1 enable it to be flexibly adjusted at different heights and positions to meet the construction requirements of variable-section bridge piers; the first outer formwork 21 and the second outer formwork 22 are slidably connected and can flexibly adjust the pouring space size, ensuring the sealing and stability between the formworks and preventing concrete leakage; the hinge connection and telescopic drive of the inner formwork assembly 3 enable the first inner formwork 33 and the second inner formwork 34 to flexibly adjust the pouring space size according to the cross-section change of the bridge pier 100, and ensure the pouring quality and construction accuracy; the multi-directional movement design of the lifting assembly 4 improves the flexibility and efficiency of formwork lifting, further enhancing the overall construction effect; the design of the sliding drive assembly 5 enables the sliding adjustment of the large-surface truss 121 and the small-surface truss 122 to be more stable, reducing the pouring quality problems caused by position deviation; the introduction of the flipping platform 6 provides a more convenient operation platform for construction workers and enhances construction safety at the same time; the setting of the protective frame 7 can effectively prevent construction workers from accidentally falling during high-altitude operations, improving construction safety; the climbing cone 8 can provide a stable climbing support point for the jacking top-section truss 12 and the jacking bottom-section truss 13.

[0053] Embodiment 2 Referring to Figure 7 , the difference between this Embodiment 2 and Embodiment 1 is that: the support platform further includes a connecting truss 9; the lifting assembly 4 includes a number of third telescopic drive members 42 and a number of fourth telescopic drive members 43.

[0054] Specifically, in this embodiment, the connecting truss 9 is made of high-strength steel to ensure its structural strength. The connecting truss 9 is arranged parallel to the second outer formwork 22 at the top of the bridge pier. The two ends of the connecting truss 9 are respectively welded to the top of the small-surface truss 122, and the top end of the inner formwork support 31 is welded to the middle of the connecting truss 9; preferably, when the jacking top-section truss 12 climbs, it can drive the connecting truss 9 to climb together to drive the inner formwork support 31 to rise. At the same time, the inner formwork support 31 drives the first inner formwork 33, the second inner formwork 34, and the movable formwork 35 to rise together to realize the demoulding and movement of the formwork. In other embodiments, the inner formwork support 31 can be directly connected to the small-surface truss 122.

[0055] Referring to Figure 8 and Figure 9, in this embodiment, the third telescopic driving member 42 and the fourth telescopic driving member 43 can be hydraulic cylinders or pneumatic cylinders; the third telescopic driving member 42 is welded to the large surface truss 121, and the output end of the third telescopic driving member 42 is welded to the side of the first outer formwork 21 facing away from the pouring surface. Controlling the telescopic movement of the output end of the third telescopic driving member 42 can make the first outer formwork 21 approach or move away from the outer surface of the pier 100 to achieve formwork closing or formwork removal; the output end of the fourth telescopic driving member 43 is welded to the side of the second outer formwork 22 facing away from the pouring surface. Controlling the telescopic movement of the output end of the fourth telescopic driving member 43 can make the second outer formwork 22 approach or move away from the outer surface of the pier 100 to achieve formwork closing or formwork removal; preferably, when the jacking top joint truss 12 climbs, it can drive the first outer formwork 21 and the second outer formwork 22 to rise.

[0056] The advantages of Embodiment 2 compared with Embodiment 1 are as follows: The settings of the third telescopic driving member 42 and the fourth telescopic driving member 43 can enable automatic formwork closing or formwork removal of the formwork, and after formwork removal, the inner formwork assembly 3 and the outer formwork assembly 2 can climb together with the jacking top joint truss 12, without manual operation for formwork closing or formwork removal, improving the construction efficiency and construction safety, and ensuring the accuracy and stability of the pouring space.

[0057] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A support platform for the construction of variable cross-section bridge piers, characterized in that: include: A jacking mechanism (1), the jacking mechanism (1) surrounding the outer facade of the pier (100) and being able to climb along the outer facade of the pier (100) as the height of the cast section of the pier (100) increases, a template lifting channel being provided between the jacking mechanism (1) and the outer facade of the pier (100); An outer formwork assembly (2) is arranged in the formwork lifting channel, the outer formwork assembly (2) comprising at least two first outer formworks (21) arranged opposite to each other and at least two second outer formworks (22) arranged opposite to each other, and two side edges of the first outer formworks (21) are respectively slidably abutted against casting surfaces of the at least two second outer formworks (22) arranged opposite to each other; An inner formwork assembly (3) is arranged in the inner cavity of a bridge pier (100), the inner formwork assembly (3) comprising an inner formwork support (31), a first telescopic driving member (32), at least two first inner formworks (33) arranged face to face, and at least four second inner formworks (34), the inner formwork support (31) being arranged in the inner cavity of the bridge pier (100), the first telescopic driving member (32) being mounted on the inner formwork support (31), two first inner formworks (33) being respectively fixed to two ends of the first telescopic driving member (32), one side of the second inner formwork (34) being hinged to the side edge of the first inner formwork (33), and a space for the second inner formworks (34) being reserved between two adjacent second inner formworks (34). a second telescopic driving member (36) for driving the second inner template (34) to flip is provided between the second inner template (34) and the first inner template (33); a casting space is formed between the first inner template (33), the second inner template (34) and the first outer template (21) and the second outer template (22); a movable template (35) is provided on the casting surface of the second inner template (34); the movable templates (35) adjacent to the second inner template (34) are stacked to isolate the casting space and the avoidance space; the first telescopic driving member (32) can drive the first inner template (33) to approach or move away from the inner template support (31) to reduce or expand the casting space; A lifting assembly (4) is arranged on the lifting mechanism (1); the lifting assembly (4) can rise along with the lifting mechanism (1) to raise the height of the inner formwork assembly (3) and the outer formwork assembly (2).

2. A support platform for construction of variable cross-section bridge piers according to claim 1, characterized in that: The jacking mechanism (1) comprises a jacking drive member (11) and a jacking top section truss (12) and a jacking bottom section truss (13) arranged on the pier (100); the bottom end of the jacking top section truss (12) is slidably connected to the top end of the jacking bottom section truss (13) through the jacking drive member (11); when the jacking top section truss (12) is fixed to the outer facade of the pier (100), the jacking drive member (11) can raise the height of the jacking bottom section truss (13); when the jacking bottom section truss (13) is fixed to the outer facade of the pier (100), the jacking drive member (11) can raise the height of the jacking top section truss (12).

3. The support platform for construction of variable cross-section bridge piers according to claim 2, characterized in that: The lifting assembly (4) comprises a lifting gantry (41), the lifting gantry (41) comprising a gantry frame (411) slidably arranged on a lifting top section truss (12) and a boom (412) slidably arranged on the gantry frame (411), the sliding direction of the gantry boom on the lifting top section truss (12) being inclined to the sliding direction of the boom (412) on the gantry crane.

4. The support platform for variable cross-section bridge pier construction according to claim 2, characterized in that: The lifting assembly (4) comprises a plurality of third telescopic driving members (42) and a plurality of fourth telescopic driving members (43) arranged on the lifting top section truss (12); the inner formwork support (31) is connected to the lifting top section truss (12); the output end of the third telescopic driving member (42) is connected to the first outer formwork (21) and is used to drive the first outer formwork (21) away from or close to the outer facade of the pier (100); the output end of the fourth telescopic driving member (43) is connected to the second outer formwork (22) and is used to drive the first outer formwork (21) away from or close to the outer facade of the pier (100).

5. The support platform for construction of variable cross-section bridge piers according to claim 2, characterized in that: The lifting top section truss (12) comprises at least two large-surface trusses (121) and a small-surface truss (122), wherein the two large-surface trusses (121) are arranged face to face, the large-surface trusses (121) are arranged on a side of the first outer formwork (21) away from the casting surface, and the small-surface trusses (122) are slidably arranged on the two large-surface trusses (121), and the sliding direction of the small-surface trusses (122) is parallel to the casting surface of the second outer formwork (22).

6. The support platform for construction of variable cross-section bridge piers according to claim 5, characterized in that: The invention also comprises a sliding drive assembly (5) for driving the small face truss (122) to slide, wherein the sliding drive assembly (5) comprises a driving motor (51), a driving gear (52) and a driven rack (53), wherein the driving motor (51) is fixed on the large face truss (121), an output shaft of the driving motor (51) is fixedly connected to the driving gear (52), the driven rack (53) is arranged on the small face truss (122) and meshes with the driving gear (52), and an extension direction of the driven rack (53) is parallel to a sliding direction of the small face truss (122).

7. The support platform for construction of variable cross-section bridge piers according to claim 2, characterized in that: A flipping platform (6) is provided on the lifting top section truss (12), and the flipping platform (6) comprises a fixed plate (61) and a flipping plate (62). The fixed plate (61) is laid flat on the lifting top section truss (12), and one side of the flipping plate (62) is hinged to a side of the fixed plate (61) close to the inner formwork assembly (3). When the flipping plate (62) is folded relative to the fixed plate (61), an end of the flipping plate (62) that is away from the fixed plate (61) moves away from or close to the outer formwork assembly (2).

8. The support platform for variable cross-section bridge pier construction according to claim 2, characterized in that: A first roller (123) is provided on one side of the outer facade of the pier (100) of the jacking top section truss (12), and a second roller (131) is provided on one side of the outer facade of the pier (100) of the jacking bottom section truss (13), wherein the first roller (123) and the second roller (131) roll and abut against the outer facade of the pier (100).

9. The support platform for construction of variable cross-section bridge piers according to claim 2, characterized in that: A protective frame (7) for preventing people from falling is provided around the top surface of the lifting top section truss (12).

10. The support platform for variable cross-section bridge pier construction according to claim 1, characterized in that: It also includes a climbing spine (8), one end of which is arranged in the bridge pier (100) and the other end of which protrudes from the outer surface of the bridge pier (100) and is connected to the jacking mechanism (1).

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