Main and middle supporting leg supporting platform and movable formwork system

Abstract

The invention relates to the technical field of bridge construction, in particular to a main and middle supporting leg supporting platform and a movable formwork system.The main and middle supporting leg supporting platform is arranged on a bridge pier, the bridge pier comprises a bearing platform located at the bottom and a pier body arranged on the bearing platform, and the main and middle supporting leg supporting platform comprises a support assembly comprising long stand columns and short stand columns; the bottom ends of the long stand columns are supported on the bearing platform, the bottom ends of the short stand columns are supported on the top of the pier body, and the top heights of the long stand columns and the short stand columns are the same. The platform part is arranged at the top of the bracket assembly; and the main middle supporting leg mechanism is arranged on the platform part and is used for supporting a main beam of the movable formwork. According to the scheme, the defects that in the prior art, supporting is unstable and adjustment is difficult due to the height difference of bridge piers are overcome, different construction environments can be rapidly adapted, and supporting stability and operation flexibility are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, in particular to a main and middle leg support platform and a movable formwork system. Background Art

[0002] In modern bridge construction, mobile formwork bridge cranes, as key equipment, play a vital role in improving construction efficiency and ensuring project quality. Especially during the construction of continuous beam bridges or long-span bridges, mobile formwork must be frequently moved from one pier to another to complete the casting or installation of each bridge section. To ensure the safety and stability of the mobile formwork during hoisting operations, the design of its support system is particularly important.

[0003] Existing mobile formwork support methods mainly rely on fixed or semi-fixed support structures, such as the traditional foundation reinforcement plus steel support leg combination. Although it meets construction needs to a certain extent, it also exposes many problems: on the one hand, when encountering soft foundations or complex terrain, traditional support methods are difficult to ensure sufficient stability; on the other hand, due to the different heights of bridge piers, the height differences of support points are large, making it difficult and time-consuming to adjust the support legs, seriously affecting the construction progress. Summary of the Invention

[0004] The present invention provides a main and middle leg support platform and a mobile formwork system to solve the defects of the prior art, such as unstable support and difficult adjustment caused by differences in pier heights, so as to achieve rapid adaptation to different construction environments, enhance support stability and operational flexibility.

[0005] The present invention provides a main-middle leg support platform, which is arranged on a bridge pier, wherein the bridge pier includes a pedestal located at the bottom and a pier body arranged on the pedestal, and the main-middle leg support platform includes: a bracket assembly, including a long column and a short column, the bottom end of the long column is supported on the pedestal, the bottom end of the short column is supported on the top of the pier body, and the top heights of the long column and the short column are the same; a platform part, which is arranged on the top of the bracket assembly; a main-middle leg mechanism, which is arranged on the platform part and is used to support the main beam of a movable formwork.

[0006] According to one embodiment of the present invention, the support assembly includes: a first row of columns, including two long columns and at least two short columns, wherein the two long columns in the first row of columns are respectively arranged on both sides of the pier body, and at least two short columns are arranged in parallel on the top of the pier body between the two long columns; a second row of columns, including a plurality of long columns, wherein the plurality of long columns in the second row of columns are arranged in parallel on one side of the pier body.

[0007] According to one embodiment of the present invention, a tensioning assembly is provided between the second row of columns and the pier body, and the tensioning assembly includes: a first cross bar fixed to the plurality of long columns of the second row of columns; a second cross bar provided on the side of the pier body facing away from the second row of columns; tensioning steel bars penetrating the pier body and the first cross bar and the second cross bar on both sides of the pier body; and fasteners, two of the fasteners being respectively provided at both ends of the tensioning steel bars to lock the first cross bar and the second cross bar to the surface of the pier body.

[0008] According to one embodiment of the present invention, the bracket assembly includes a transverse connecting rod, and the transverse connecting rod is connected between the long columns, and / or between the short columns, and / or between the long columns and the short columns.

[0009] According to one embodiment of the present invention, the transverse connecting rod is connected between the long columns of the second row of columns and the long columns of the first row of columns, and the transverse connecting rod is connected between the long columns of the first row of columns and the second transverse rod, so as to form a circle around the pier body through the transverse connecting rod and the second transverse rod; and a chamfered reinforcement rod is provided between the transverse connecting rod and the second transverse rod on the inner side of the connection corner between the transverse connecting rod and the second transverse rod.

[0010] According to one embodiment of the present invention, diagonal bracing rods are provided between the transverse connecting rods at different heights.

[0011] According to one embodiment of the present invention, the long column and the short column are both provided with column cap fixings and column base fixings; the column cap fixings include a first fixing plate and a first reinforcing plate vertically arranged between the first fixing plate and the long column or the short column; the column base fixings include a second fixing plate and a second reinforcing plate vertically arranged between the second fixing plate and the long column or the short column, and the lower surface of the second fixing plate is provided with anchor bars buried in the top of the pier body or the pedestal.

[0012] According to one embodiment of the present invention, the platform portion includes an I-beam, and the I-beam is fixedly disposed on the top ends of the long columns and the short columns.

[0013] According to one embodiment of the present invention, the main middle support leg mechanism includes a plurality of assembled columns, and the assembled columns are arranged above the I-beam crossbeam; the assembled columns include a plurality of vertically stacked assembled plates.

[0014] The present invention also provides a mobile formwork system, comprising the main middle leg support platform of the above embodiment.

[0015] The main and middle leg support platform provided by this invention addresses the existing drawbacks of unstable support and difficulty in adjustment due to varying pier heights by adjusting the height difference between the long and short columns. This allows for rapid adaptation to diverse construction environments, enhanced support stability, and operational flexibility. The core of this technical solution lies in the reliable integration of the long and short column bracket assembly with the piers. Based on the pier's cap and pier body, this provides a reliable main and middle leg support platform that meets the requirements of mobile formwork support.

[0016] Specifically, the support assembly includes long columns and short columns. The bottom end of the long column is supported on the pier's pedestal, and the bottom end of the short column is supported on the top of the pier. By precisely setting the height of the two, their top heights are kept consistent, ensuring the levelness and stability of the support platform. The platform portion is set on the top of the support assembly, providing a flat and stable support surface for the main beam, while the main and middle support leg mechanism is installed on the platform portion, directly supporting the main beam of the mobile formwork, ensuring its stability and safety during lifting operations. The mobile formwork system using the above-mentioned main and middle support leg support platform can not only complete bridge construction tasks efficiently and safely, but also significantly reduce adjustment time and costs, thereby improving overall construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the lateral structure of the main middle leg support platform provided by the present invention.

[0019] Figure 2 It is a structural schematic diagram of the first row of columns of the main middle leg support platform provided by the present invention.

[0020] Figure 3 It is a structural schematic diagram of the second row of columns of the main middle leg support platform provided by the present invention.

[0021] Figure 4 yes Figure 1 A partial enlarged view of the structure shown.

[0022] Figure 5 It is a structural schematic diagram of the column cap fixing parts and column foot fixing parts of the main middle support leg support platform provided by the present invention.

[0023] Figure 6 This is one of the cross-sectional schematic diagrams of the main middle leg support platform provided by the present invention.

[0024] Figure 7 This is the second cross-sectional schematic diagram of the main middle leg support platform provided by the present invention.

[0025] Reference numerals: 11. Cap; 12. Pier body; 21. Long column; 22. Short column; 23. First row of columns; 24. Second row of columns; 25. First fixed plate; 26. First reinforcement plate; 27. Second fixed plate; 28. Second reinforcement plate; 29. Anchor bars; 30. Platform; 31. I-beam; 40. Main and middle support leg mechanism; 41. Assembled pillar; 42. Assembled plate; 51. First cross bar; 52. Second cross bar; 53. Tensile reinforcement; 54. Fasteners; 55. Transverse connecting rod; 56. Chamfered reinforcement rod; 57. Diagonal bracing rod. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install" and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] The first hole installation of a mobile formwork bridge-building machine is usually carried out on an already constructed abutment or beam surface. The present invention provides an innovative solution, namely, setting up a temporary steel column platform on the abutment and pier to complete the equipment installation, breaking through the traditional method of requiring the first hole installation to be carried out on the completed abutment or first hole beam. The steel columns of the platform are supported on the abutment or pier, and the foundation has good bearing capacity. The pier body can be used to set up wall parts to ensure the stability and reliable force of the steel column platform. The steel column platform is preferably 3 meters wide, which saves turnover materials and is easy to dismantle later.

[0029] The following combination Figures 1 to 7 A specific embodiment of the main center leg support platform of the present invention is described.

[0030] like Figure 1 、 Figure 2 and Figure 3 As shown, the present invention provides a main-center leg support platform, which is installed on a bridge pier. The bridge pier includes a base 11 at the bottom and a pier body 12 installed on the base 11. The main-center leg support platform includes: a bracket assembly, including a long column 21 and a short column 22, the bottom end of the long column 21 supported on the base 11, and the bottom end of the short column 22 supported on the top of the pier body 12, with the tops of the long column 21 and the short column 22 at the same height; a platform portion 30, which is installed on the top of the bracket assembly; and a main-center leg mechanism 40, which is installed on the platform portion 30 and is used to support the main beam of the mobile formwork. The main-center leg support platform provided by the present invention solves the defects of the prior art such as unstable support and difficult adjustment caused by the height difference of the bridge pier by adjusting the height difference between the long column 21 and the short column 22, and realizes rapid adaptation to different construction environments, enhanced support stability and operational flexibility. The core of this technical solution is to achieve reliable connection with the bridge pier through the bracket assembly of long columns 21 and short columns 22. Based on the pier's base 11 and pier body 12, a main and middle leg support platform that meets the support requirements of the mobile formwork and is relatively reliable is provided.

[0031] Specifically, the support assembly of the main middle support leg support platform of the present invention includes a long column 21 and a short column 22. The bottom end of the long column 21 is supported on the pedestal 11 of the pier, and the bottom end of the short column 22 is supported on the top of the pier body 12. Through the long column 21 and the short column 22, and the height matching mechanism between them, the present invention can adapt the relative height of the support platform according to the specific height of the pier, ensuring that the support platform can remain horizontal even when operating between piers of different heights. The platform portion 30 is arranged on the top of the support assembly to provide a flat and stable support surface for the main beam, and the main middle support leg mechanism 40 is installed on the platform portion 30 to directly support the main beam of the mobile formwork, ensuring its stability and safety during operation.

[0032] Preferably, height adjustment devices can be integrated into the long and short columns 21 and 22, such as hydraulic adjustment devices integrated within the columns, to achieve height adjustment. Sensors can also be provided to monitor the levelness and load of the support platform in real time. Furthermore, anti-slip measures or other positioning mechanisms can be added to the platform portion 30 to further ensure construction safety.

[0033] According to the present invention, a main center leg support platform comprises a support assembly comprising: a first row of columns 23, comprising two long columns 21 and at least two short columns 22, wherein the two long columns 21 in the first row of columns 23 are disposed on either side of the pier 12, and the at least two short columns 22 are arranged in parallel on the top of the pier 12 between the two long columns 21; and a second row of columns 24, comprising a plurality of long columns 21, wherein the plurality of long columns 21 in the second row of columns 24 are arranged in parallel on one side of the pier 12. Specifically, the two rows of columns provide reliable support for the platform portion 30, wherein the at least two short columns 22 in the first row of columns 23 are disposed on the top of the pier 12, fully utilizing the space atop the pier 12 and providing a more reliable support assembly structure based on the pier. The two long columns 21 in the first row of columns 23 are located on either side of the pier 12, while the short columns 22 are located at the top of the pier 12 between the two long columns 21. Together with the long columns 21, they form a stable support framework, ensuring level and uniform load distribution on the platform 30. The multiple long columns 21 in the second row of columns 24 are arranged in parallel on one side of the pier 12, further increasing the lateral stability of the support platform and ensuring the robustness and reliability of the entire support system.

[0034] Preferably, in order to improve the adaptability and flexibility of the support platform, adjustable connectors can be set between the columns so that the support structure can be quickly adjusted according to the actual construction environment to ensure stability and reliability under different heights and terrain conditions.

[0035] like Figure 6 and Figure 7As shown, according to a main center leg support platform of the present invention, a tensioning assembly is provided between the second row of columns 24 and the pier shaft 12. The tensioning assembly includes: a first crossbar 51 fixed to the plurality of long columns 21 in the second row of columns 24; a second crossbar 52 provided on the side of the pier shaft 12 facing away from the second row of columns 24; tensioning steel bars 53 penetrating the pier shaft 12 and the first and second crossbars 51, 52 on both sides of the pier shaft 12; and fasteners 54, two fasteners 54 provided at each end of the tensioning steel bars 53 to lock the first and second crossbars 51, 52 to the surface of the pier shaft 12. Specifically, the tensioning assembly forms a solid connection system between the second row of columns 24 and the pier shaft 12, significantly enhancing the lateral stability and overall rigidity of the support platform. The first crossbar 51 is fixed to the multiple long columns 21 in the second row of columns 24, ensuring the lateral stability of the second row of columns 24. The second crossbar 52 is located on the side of the pier 12 facing away from the second row of columns 24, forming a tensioning structure with the first crossbar 51. The tensioning steel bars 53 penetrate the pier 12 and the first and second crossbars 51, 52 on both sides of the pier 12. Fasteners 54 securely fasten the first and second crossbars 51, 52 to the surface of the pier 12, effectively transmitting and distributing lateral loads, preventing the columns from shifting or deforming when subjected to lateral forces, and ensuring the stability and safety of the entire support platform.

[0036] Preferably, an adjustment device can be added to the tensioning steel bars 53. For example, the fastener 54 can be set as a threaded adjuster to fine-tune the tension of the tensioning steel bars 53 during installation to ensure the precise alignment and tightening of the first crossbar 51 and the second crossbar 52. In addition, reinforcing ribs or reinforcement plates can be set on the first crossbar 51 and the second crossbar 52 to further improve their load-bearing capacity and bending resistance. In order to enhance the durability and corrosion resistance of the tensioning assembly, the surface of the tensioning steel bars 53 and the crossbars can be coated with anti-corrosion materials to extend their service life. At the same time, embedded parts can be set on both sides of the pier body 12 to pre-fix the position of the second crossbar 52, simplifying the installation process and improving construction efficiency.

[0037] like Figure 7As shown, according to a main center leg support platform of the present invention, the support assembly includes a transverse link 55, which is connected between the long columns 21, and / or between the short columns 22, and / or between the long columns 21 and the short columns 22. Specifically, the transverse link 55 significantly enhances the overall stability and rigidity of the support assembly. By providing the transverse link 55 between the long columns 21, the short columns 22, and the long columns 21 and the short columns 22, a more stable support frame is formed, effectively preventing lateral displacement and deformation of the columns under load. This not only improves the load-bearing capacity of the support platform, but also ensures the horizontality and stability of the platform portion 30, providing a more reliable support foundation for the main beam of the mobile formwork. The transverse link 55 can evenly distribute the load across the columns, preventing individual columns from bearing excessive pressure, thereby extending the service life of the support platform. The transverse link 55 can be connected using quick-connect fittings, such as bolts or latches, making installation and disassembly easier and faster, improving construction efficiency.

[0038] Preferably, an adjustable device, such as a telescopic joint or a threaded adjuster, can be added to the transverse link 55 so that the length of the link can be adjusted according to actual needs during installation to ensure precise alignment and tightening between the columns. In addition, reinforcing ribs or reinforcement plates can be added to key parts of the transverse link 55 to further improve its load-bearing capacity and bending resistance, especially in the case of large spans or high loads, to ensure the stability and durability of the link.

[0039] like Figure 6 As shown, according to a main center leg support platform of the present invention, a transverse connecting rod 55 is connected between the long columns 21 of the second row of columns 24 and the long columns 21 of the first row of columns 23. A transverse connecting rod 55 is also connected between the long columns 21 of the first row of columns 23 and the second crossbar 52, so that the transverse connecting rod 55 and the second crossbar 52 are connected to form a circle around the pier body 12. A chamfered reinforcement rod 56 is provided between the transverse connecting rod 55 and the second crossbar 52 on the inner side of the connecting corner between the transverse connecting rod 55 and the second crossbar 52. Specifically, through multi-directional connection and reinforcement, the overall stability and rigidity of the support platform are significantly enhanced. The transverse connecting rod 55 between the long columns 21 of the second row of columns 24 and the long columns 21 of the first row of columns 23, as well as the transverse connecting rod 55 between the long columns 21 of the first row of columns 23 and the second crossbar 52, form a closed ring structure that surrounds the pier body 12, effectively preventing lateral displacement and deformation of the columns when subjected to stress. The chamfered reinforcement rod 56 is arranged on the inner side of the connection corner between the transverse link 55 and the second cross bar 52, further enhancing the rigidity and stability of the connection node and ensuring the reliability and safety of the entire support platform under various construction conditions.

[0040] Furthermore, according to a main middle leg support platform of the present invention, the above-mentioned transverse connecting rods 55 can be set at multiple height positions, and diagonal bracing rods 57 are preferably set between the transverse connecting rods 55 at different heights. The design of multiple layers of transverse connecting rods 55 and diagonal bracing rods 57 significantly enhances the vertical and lateral stability of the support platform. By arranging transverse connecting rods 55 at multiple height positions, not only is the connection strength between the columns further improved, but a multi-layer support structure is also formed, which effectively disperses and transmits vertical loads, ensuring uniform stress on the entire support platform in the height direction. The diagonal bracing rods 57 are set between the transverse connecting rods 55 at different heights, further enhancing the rigidity and shear resistance of the support structure, effectively preventing lateral displacement and deformation of the columns when subjected to stress, especially when facing lateral wind force or other lateral loads, and can provide stronger resistance to ensure the stability and safety of the support platform.

[0041] like Figure 5 As shown, according to a main middle leg support platform of the present invention, both the long column 21 and the short column 22 are provided with a column cap fixing member and a column foot fixing member; the column cap fixing member includes a first fixing plate 25 and a first reinforcing plate 26 vertically arranged between the first fixing plate 25 and the long column 21 or the short column 22; the column foot fixing member includes a second fixing plate 27 and a second reinforcing plate 28 vertically arranged between the second fixing plate 27 and the long column 21 or the short column 22. The lower surface of the second fixing plate 27 is provided with an anchoring bar 29 embedded in the top of the pier body 12 or the base 11. The dual fixation of the column cap fixing member and the column foot fixing member significantly enhances the stability and load-bearing capacity of the column.

[0042] Specifically, the second fixing plate 27 and second reinforcing plate 28 of the column foot fixture ensure the stability of the column base. Anchor bars 29 on the lower surface of the second fixing plate 27 are embedded in the top of the pier shaft 12 or the base 11, providing strong pull-out and shear resistance, ensuring the stability and reliability of the column under various construction conditions. This design not only improves the column's load-bearing capacity and overall rigidity, but also ensures the safety and stability of the support platform during construction.

[0043] Optimally, the following improvements can be added to the anchor bar 29: a hook-shaped structure can be provided at the end of the anchor bar 29 to increase the contact area with the concrete, improve the anchoring effect, and prevent the anchor bar 29 from being pulled out when subjected to stress; multiple anchor bars 29 can be provided to further enhance the fixing effect at the bottom of the column and improve the pull-out and shear resistance; the anchor bar 29 can be configured as a downward-opening C-shaped structure to better embed in the concrete, provide a stronger anchoring effect, and prevent the column from shifting or toppling when subjected to stress. Through these optimization measures, the main and middle leg support platform of the present invention is not only more structurally stable and reliable, but also excels in construction convenience and maintenance, providing a more comprehensive and efficient solution for bridge construction.

[0044] like Figure 4 As shown, according to a main middle leg support platform of the present invention, the platform portion 30 includes an I-beam crossbeam 31, and the I-beam crossbeam 31 is fixedly arranged at the top of the long column 21 and the short column 22. Specifically, the use of the I-beam crossbeam 31 significantly enhances the load-bearing capacity and stability of the platform portion 30. The I-beam crossbeam 31 is fixedly arranged at the top of the long column 21 and the short column 22, forming a solid horizontal support surface, ensuring the stability and safety of the main beam of the mobile formwork during operation. The structural characteristics of the I-beam give it high strength and rigidity, which can effectively transmit and disperse the load from above, preventing the platform portion 30 from being deformed or damaged when subjected to force.

[0045] Preferably, the column cap fixings can be installed on the lower surface of the I-beam 31 through the first fixing plate 25 by welding or flange connection, further enhancing the reliability and stability of the connection. The I-beam 31 is preferably composed of multiple closely arranged I-beams. For the multi-row column support structure of the bracket assembly, multiple groups of closely arranged I-beams can be provided to form multiple I-beams 31, further improving the load-bearing capacity and stability of the platform portion 30. Reinforcing plates or ribs can be added at the connection nodes between the I-beam 31 and the columns to further enhance the rigidity and stability of the connection nodes and prevent the nodes from loosening or being damaged when subjected to stress.

[0046] According to the present invention, a main center leg support platform comprises a main center leg mechanism 40 comprising a plurality of assembled struts 41 positioned above an I-beam crossbeam 31. These struts 41 comprise a plurality of vertically stacked assembly plates 42. The stacked structure of the assembly plates 42 allows the height of the struts 41 to be flexibly adjusted based on actual construction requirements, enhancing the adaptability and flexibility of the support platform. This allows the height of the struts 41 to be quickly adjusted to accommodate bridge piers of varying heights and construction environments.

[0047] Preferably, corresponding concave-convex positioning structures can be provided on the upper and lower surfaces of the assembly panels 42 for reliable lamination. For example, the upper and lower surfaces of the assembly panels 42 can be designed with a structure having grooves and protrusions. The mutual engagement of the grooves and protrusions ensures a tight connection and stable lamination between the assembly panels 42. This concave-convex positioning structure not only improves the connection strength between the assembly panels 42, but also prevents the assembly panels 42 from sliding or misaligning when subjected to force, thereby ensuring the overall stability and reliability of the assembly pillar 41. In addition, the assembly panels 42 can be further fixed together by connecting members such as bolts or clips to ensure stability and safety under high-intensity loads.

[0048] The mobile formwork system provided by the present invention is described below. The mobile formwork system described below and the main and middle leg support platform described above can be referred to in correspondence with each other.

[0049] The present invention also provides a mobile formwork system comprising the main and middle leg support platform of the aforementioned embodiment. Designed for the construction of double-track, full-span bridges on dedicated passenger railway lines, this mobile formwork system is capable of self-reversing the main legs. It primarily comprises a main frame, rear travel mechanism, rear support, main and middle legs, front legs, a lifting trolley, hanging outer ribs, an outer and bottom formwork system, an end formwork system, an outer rib transverse movement mechanism, a hanging outer rib transverse locking mechanism, a detachable inner formwork system, an electrical and hydraulic system, and auxiliary facilities.

[0050] In practice, the various components of the mobile formwork are transported to the component storage area at the installation site. The outriggers and main beam structures are pre-assembled according to the assembly sequence and placed at the assembly location. A crane is then used to hoist and install the components in sequence. The fixed center outriggers and main center outriggers are assembled within the construction site between the piers of the first span, and the main center outriggers are precisely positioned. Because there are no cast-in-place beams at this point, only piers can be used for installation. Therefore, during construction of the first span, the main center outriggers need to be supported on a support platform beneath them.

[0051] According to a preferred embodiment of the present invention, the support assembly of the main middle leg support platform adopts the support form of steel pipe columns. Two rows of columns are set on site. The first row of columns 23 adjacent to the pier body 12 adopts a specification of 630×8mm, and the second row of columns 24 adopts a specification of 530×7mm. The column height is adjusted according to the on-site ground elevation and the height of the pier. The two rows of columns are connected by a transverse connecting rod 55. The distance between the two rows of columns is 125cm. Four columns 23 are arranged horizontally in the first row, two of which are arranged on both sides of the pier body 12 with a transverse spacing of 820cm. The column bases are supported on the pedestal 11, and two are arranged on the upper part of the pier body 12 with a transverse spacing of 480cm. The column bases are supported on the pier body 12 pad stone; three columns 24 are arranged horizontally in the second row with a transverse spacing of 310cm. The column bases are supported on the pedestal 11.

[0052] A 12mm steel plate is welded to the column foot as a connector, fully welded to the column, and installed with a trapezoidal stiffener. A 20mm thick steel plate is welded to the column cap as a connector. The steel plate size is the same as the pre-embedded steel plate, fully welded to the column, and installed with a trapezoidal stiffener. A 5I40b I-beam is installed horizontally as a transverse load-bearing beam to support the center leg and platform section 30. The I-beam fits tightly against the column; wedge-shaped steel pads can be used to wed in areas where there is a lack of fit. At the same time, angle steel can be welded to the edge of the load-bearing beam to prevent it from slipping. A tension assembly is used to secure the support column to the pier body 12 using the tie rod holes in the pier body 12. The tension assembly, the pier body 12, and the support form a stable system to ensure the stability of the support.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or modes and features of different embodiments or modes described in this specification without contradiction.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A main middle leg support platform, characterized in that: The bridge pier is provided on the bridge pier, the bridge pier comprises a base (11) located at the bottom, and a pier body (12) provided on the base (11), and the main middle leg support platform comprises: A bracket assembly comprises a long column (21) and a short column (22), wherein the bottom end of the long column (21) is supported on the support platform (11), and the bottom end of the short column (22) is supported on the top of the pier body (12), and the top heights of the long column (21) and the short column (22) are the same; A platform portion (30) is provided on the top of the bracket assembly; The main middle support leg mechanism (40) is arranged on the platform portion (30) and is used to support the main beam of the movable formwork.

2. The main middle leg support platform according to claim 1, characterized in that: The bracket assembly includes: A first row of columns (23) includes two long columns (21) and at least two short columns (22), wherein the two long columns (21) in the first row of columns (23) are respectively arranged on both sides of the pier body (12), and at least two short columns (22) are arranged in parallel on the top of the pier body (12) between the two long columns (21); The second row of columns (24) includes a plurality of the long columns (21), wherein the plurality of the long columns (21) in the second row of columns (24) are arranged in parallel on one side of the pier body (12).

3. The main middle leg support platform according to claim 2, characterized in that: A tensioning assembly is provided between the second row of columns (24) and the pier body (12), and the tensioning assembly comprises: A first crossbar (51) fixed to the plurality of long columns (21) of the second row of columns (24); A second crossbar (52) is provided on a side of the pier body (12) facing away from the second row of columns (24); Tensile steel bars (53) penetrate the pier body (12) and the first cross bar (51) and the second cross bar (52) on both sides of the pier body (12); Fasteners (54), two of the fasteners (54) are respectively arranged at both ends of the tension steel bars (53) to lock the first cross bar (51) and the second cross bar (52) to the surface of the pier body (12).

4. The main middle leg support platform according to claim 3, characterized in that: The bracket assembly comprises a transverse connecting rod (55), wherein the transverse connecting rod (55) is connected between the long columns (21), and / or between the short columns (22), and / or between the long columns (21) and the short columns (22).

5. The main middle leg support platform according to claim 4, characterized in that: The transverse connecting rod (55) is connected between the long columns (21) of the second row of columns (24) and the long columns (21) of the first row of columns (23), and the transverse connecting rod (55) is connected between the long columns (21) of the first row of columns (23) and the second transverse rod (52), so as to form a circle around the pier body (12) through the transverse connecting rod (55) and the second transverse rod (52); A chamfered reinforcement rod (56) is provided between the transverse link (55) and the second transverse rod (52) on the inner side of the connection corner between the transverse link (55) and the second transverse rod (52).

6. The main middle leg support platform according to claim 4, characterized in that: Diagonal support rods (57) are provided between the transverse connecting rods (55) at different heights.

7. The main middle leg support platform according to claim 1, characterized in that: The long column (21) and the short column (22) are both provided with a column cap fixing piece and a column foot fixing piece; The column cap fixing member comprises a first fixing plate (25), and a first reinforcing plate (26) vertically arranged between the first fixing plate (25) and the long column (21) or the short column (22); The column foot fixing member includes a second fixing plate (27) and a second reinforcing plate (28) vertically arranged between the second fixing plate (27) and the long column (21) or the short column (22), and the lower surface of the second fixing plate (27) is provided with anchoring bars (29) embedded in the top of the pier body (12) or the base (11).

8. The main middle leg support platform according to any one of claims 1 to 7, characterized in that: The platform portion (30) comprises an I-beam crossbeam (31), and the I-beam crossbeam (31) is fixedly arranged on the top ends of the long column (21) and the short column (22).

9. The main middle leg support platform according to claim 8, characterized in that: The main middle support leg mechanism (40) comprises a plurality of assembled pillars (41), and the assembled pillars (41) are arranged above the I-beam crossbeam (31); The assembly pillar (41) comprises a plurality of assembly plates (42) arranged in a vertical stack.

10. A mobile mold frame system, characterized in that: It comprises the main middle leg support platform as described in any one of claims 1 to 9.

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