Combined support for construction of extremely-small-radius interchange ramp high-pier cast-in-place box girder

Abstract

The invention provides a combined support for extremely-small-radius intercommunication ramp high-pier cast-in-place box girder construction, and relates to the technical field of box girder construction, the combined support comprises a plurality of steel pipe columns close to a pier column on one side, and a concrete base is prefabricated at the bottom of each steel pipe column and fixedly connected with a foundation bolt through an embedded steel plate; the top walls of the multiple steel pipe columns are horizontally and fixedly provided with double-spliced I-shaped steel, and a parallel connection frame is fixedly connected between every two adjacent steel pipe columns. The device comprises a pier column, and further comprises a cow foot support, a bailey beam net rack, a disc buckle net rack and a steel rope net, the steel rope net is wound from the bottom of one side of the pier column to the top of the pier column and covers the other side of the pier column, the steel rope net is hooped on the pier column through an annular steel wire rope, and the end of the bailey beam net rack and the end of the disc buckle net rack are fixed to the steel rope net through connecting rods. The method has the advantages of being safer, smaller in occupied area and higher in construction efficiency, and the economical efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of box girder construction, in particular to a combined bracket for constructing a high-pier cast-in-situ box girder of an interchange ramp with an extremely small radius. Background Art

[0002] During the current construction of high-pier cast-in-place box girders on interchange ramps with extremely small radii, steel tubular scaffolding is typically used to construct a support system to withstand the formwork load and concrete deadweight during construction. However, traditional steel tubular scaffolding structures commonly suffer from several technical drawbacks: First, steel tube connections often utilize fasteners or lock-type connections, which occupy a large amount of space. This results in limited construction space, inconvenient operation, and increased safety hazards in interchange ramp areas with small curve radii and large variations in pier height. Second, the overall rigidity of the steel tubular scaffolding is poor, and structural stability relies on a large number of cross braces and dense nodes, making the installation and disassembly process complex and inefficient. Third, in some complex intersections or high pier areas, to meet stability requirements, the scaffolding is often densely arranged, further occupying the construction surface and limiting the simultaneous implementation of other processes.

[0003] Based on the above problems, there is an urgent need for a support system with a safer structure, smaller footprint and higher construction efficiency to meet the complex requirements of the construction of high-pier cast-in-place box girders on interchange ramps with extremely small radius, and to improve the safety and economy of construction. Summary of the Invention

[0004] The purpose of the present invention is to provide a combined support for the construction of high-pier cast-in-place box girders of interchange ramps with an extremely small radius, which has the characteristics of being safer, occupying less space, having higher construction efficiency, and being able to improve economic efficiency.

[0005] The present invention is achieved through the following technical solutions:

[0006] A combined support for the construction of high-pier cast-in-place box girders for interchange ramps with a very small radius, comprising:

[0007] There are multiple steel pipe columns close to one of the piers on one side. The bottom of the steel pipe columns is prefabricated with a concrete base and fixedly connected by embedded steel plates and anchor bolts. The top walls of the multiple steel pipe columns are horizontally fixed with double-piece I-beams, and adjacent steel pipe columns are fixedly connected with flat brackets.

[0008] There are multiple sets of bull foot brackets fixed on the side wall of the pier on the other side, and the top wall of the bull foot bracket is also fixed with double I-beams horizontally;

[0009] A Bailey beam grid, comprising a plurality of Bailey beam units, wherein the plurality of Bailey beam units are fixedly spliced ​​together to form the Bailey beam grid, and the Bailey beam grid is fixedly mounted across the double-jointed I-beams on the steel pipe column and the bull foot bracket;

[0010] A buckle grid is installed above the Bailey beam grid, and a template is installed on the buckle grid to cast the box beam in the template;

[0011] A steel rope net is provided on the pier column through an annular steel wire rope hoop, and the ends of the Bailey beam grid and the buckle grid are fixed to the steel rope net through connecting rods.

[0012] Furthermore, the connecting rod includes threaded rods at both ends and a sleeve in the middle, the threaded rod is threadedly connected to the sleeve, and both ends of the threaded rod are fixedly provided with climbing buckles, the end hoops of the Bailey beam grid and the disc buckle grid are provided with pipe clamps, and the pipe clamps are fixedly provided with hanging rings, and the climbing buckles on the threaded rods at both ends are respectively hooked and connected with the hanging rings and the steel rope net.

[0013] Furthermore, a first connector and a second connector are respectively provided between adjacent Bailey beam units. The first connector is used to simultaneously connect adjacent Bailey beam units and vertical pipes of the buckle grid. The second connector is used to connect adjacent Bailey beam units.

[0014] Furthermore, a plurality of semi-cylinders are fixedly provided on both side walls in the width direction between adjacent Bailey beam units, the semi-cylinders are formed into a cylindrical body in pairs, the outer walls of the semi-cylinders are provided with threads, the first connecting member and the second connecting member both include a U-shaped clamp and a locking cap, the U-shaped clamp includes clips on both sides, the clips are provided with notches for the passage of the cylindrical body, and the clips on both sides are provided with fastening grooves for accommodating the locking caps on the surfaces facing away from each other, the locking caps are used to be threadedly connected to the cylindrical body formed by the semi-cylinders in pairs, and a plurality of locking bolts are passed through the U-shaped clamps to be passed through and fixed on the adjacent Bailey beam units.

[0015] Furthermore, the first connecting member also includes a fixing tube, which is fixedly connected to the top of the U-shaped clip, and a plug-in rod is slidably inserted into the fixing tube. The top wall of the Bailey beam unit is provided with a plug-in groove for the plug-in rod, and an abutment plate is fixedly provided on the top of the plug-in rod. An elastic member is provided between the abutment plate and the bottom wall of the fixing tube, and the vertical tube of the buckle grid is used to be inserted into the fixing tube and abut against the abutment plate.

[0016] Furthermore, the outer wall of the fixed tube is provided with a placement groove for placing sand, and a connecting hole is opened between the placement groove and the fixed tube. A retaining ring is fixedly provided on the abutment plate, and the retaining ring is in an initial state to block the connecting hole. When the vertical tube of the disc-shaped grid abuts against the abutment plate to move it downward, the retaining ring is in a state to open the connecting hole, wherein there is a quicksand gap between the vertical tube of the disc-shaped grid and the inner wall of the fixed tube, and a convex edge is provided on the vertical tube of the disc-shaped grid, and the convex edge abuts against the inner wall of the fixed tube after the vertical tube is inserted into the fixed tube.

[0017] Furthermore, a sand inlet hole is provided on the bottom wall of the retaining ring, and a sand inlet ring groove is provided on the outer wall of the retaining ring near the bottom and at the position of the sand inlet hole along the circumferential direction;

[0018] And / or, a sealing cap is threadedly connected to the top of the fixing cylinder.

[0019] Furthermore, the Bailey beam truss includes multiple rows of Bailey beam units, and multiple groups of series parts are arranged between the multiple rows of Bailey beam units. Each group of series parts includes a pair of screw sleeves, tension studs and clamps. The pair of screw sleeves are threadedly connected to the two ends of the tension studs, and the clamps are fixedly connected to the ends of the pair of screw sleeves. The clamps are U-shaped and the end walls are provided with avoidance grooves for avoiding the cylinder. The clamps are used to be inserted into the cylinder, and the locking cap is located in the clamp and is used to clamp the clamp.

[0020] Furthermore, a plurality of embedded screws are embedded on the pier, and a pair of pressure plates are slidably sleeved on each of the embedded screws, and the pair of pressure plates are pressed onto the steel rope net. Nuts are also threadedly connected to the embedded screws, and the nuts are used to abut against the pair of pressure plates. Wooden strips are arranged between the steel rope net and the pier.

[0021] Furthermore, the bull foot bracket is in the shape of a right triangle, and is also made of a plurality of double-pieced I-beams. The bull foot bracket is fixed to the pier column by tension screws.

[0022] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0023] 1. The present invention adopts the method of centrally arranging steel pipe columns near one side of the pier column, and stably fixing them through precast concrete base, embedded steel plates and anchor bolts, thereby improving the bearing capacity and anti-overturning performance of the overall bracket; the other side is fixed to the side wall of the pier column through the bull foot bracket, forming a symmetrical support structure, avoiding the space waste caused by the full-width layout of traditional steel pipe brackets, and is particularly suitable for construction environments with extremely small radius ramps and narrow roads.

[0024] The combined use of the Leiliang grid and the Disc-type grid not only realizes a high-strength and high-rigidity formwork support system, but also simplifies the construction process and improves the efficiency of erection and dismantling through the assembly of standardized components; and the steel rope net structure is circumferentially clamped to the pier column by steel wire ropes to enhance the lateral stability of the overall support, especially in the construction of high piers, it can effectively resist horizontal thrust and wind loads, further improving the safety and adaptability of the support system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the overall structure of a modular support for the construction of high-pier cast-in-situ box girders for interchange ramps with a very small radius provided by the present invention;

[0026] Figure 2 The present invention is intended to show a side view of a steel pipe column, a Bailey beam grid and a disc-shaped grid;

[0027] Figure 3 This invention is intended to show a schematic structural diagram of a connecting rod;

[0028] Figure 4 The present invention is intended to illustrate a schematic structural diagram of the interconnection of adjacent Bailey beam units;

[0029] Figure 5 The present invention is intended to show a schematic structural diagram of the interconnection of Bailey beam units;

[0030] Figure 6 The present invention is intended to show a schematic structural diagram of a cylinder composed of semi-cylinders on a Bailey beam monomer;

[0031] Figure 7 The present invention is intended to show a cross-sectional view of a first connecting member and a second connecting member;

[0032] Figure 8 For the present invention Figure 7 Enlarged view of part A;

[0033] Figure 9 This is a schematic diagram showing the internal structure of the first connecting member of the present invention;

[0034] Figure 10 The present invention is intended to show a schematic structural diagram of a series connection member;

[0035] Figure numerals: 1-steel pipe column, 11-concrete base, 12-embedded steel plate, 13-anchor bolt, 14-flat bracket, 15-connecting frame, 2-double-piece I-beam, 3-cow foot bracket, 31-tension screw, 4-Bailey beam grid, 41-Bailey beam unit, 411-Bailey beam monomer, 4111-plug-in slot, 412-semi-cylinder, 413-cylinder, 42-embedded screw, 43-pressure plate, 431-nut, 44-wooden slats, 5-disc grid, 51-vertical pipe, 511-convex edge, 6-steel rope net, 61-steel wire rope, 62-connecting rod, 621-threaded rod, 622-sleeve, 623-carabiner , 624-pipe clamp, 625-hanging ring, 7-first connecting piece, 70-second connecting piece, 71-U-shaped clip, 711-clip, 7111-notch groove, 7112-fastening groove, 7113-locking bolt, 72-locking cap, 73-fixing cylinder, 731-plug-in rod, 7311-abutment plate, 732-elastic member, 7321-spring, 74-placement groove, 741-connecting hole, 742-retaining ring, 7421-sand inlet hole, 7422-sand inlet ring groove, 743-quicksand gap, 75-cover, 8-series piece, 81-screw sleeve, 82-tension stud, 83-plug-in clamp, 831-avoidance groove, 9-pier column. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0038] The following reference Figures 1-10As shown, and further explained in conjunction with specific embodiments, this embodiment provides a modular support for the construction of high-pier cast-in-place box girders on very small-radius interchange ramps. The support comprises a steel pipe column 1, multiple of which are installed near one side pier 9. The arrangement ensures that the steel pipe column 1 is close to the inner edge of the ramp structure, effectively saving the lateral layout space of the support system in the curved ramp and avoiding the space waste caused by the symmetrical layout of traditional steel pipe racks. The steel pipe column 1 and the pier 9 can be fixedly connected by bolts via a connecting frame 15, further enhancing their lateral rigidity and overall stability. This is particularly effective in resisting wind loads and lateral pressure of the formwork in high-pier and large-span construction scenarios.

[0039] The bottom of the steel pipe column 1 is prefabricated with a concrete base 11 and fixedly connected by embedded steel plates 12 and anchor bolts 13, forming a reliable vertical support foundation, avoiding the offset or deformation of the support system due to uneven foundation or slippage. The top walls of multiple steel pipe columns 1 are horizontally fixedly connected with double-piece I-beams 2 by high-strength bolts. As a load-bearing member, the I-beam has excellent bending resistance, ensuring that the upper structure load can be efficiently transmitted to the ground; adjacent steel pipe columns 1 are fixedly welded or fixedly connected by high-strength bolts with flat brackets 14, forming an overall frame system between the steel pipe columns 1, effectively enhancing the overall lateral stiffness and spatial stability.

[0040] There are multiple groups of bull foot brackets 3 installed and fixed on the side wall of the pier column 9 on the other side. The structural design adopts multi-point layout, and multiple bull foot brackets 3 are arranged along the vertical spacing of the pier column 9. They are firmly connected to the pier column 9 by high-strength bolts or welding to ensure their cantilever support capacity for the upper I-beam. There is a certain distance between the bull foot bracket 3 and the ground, so that it can still be flexibly arranged in a small site or when there are ground obstacles, without affecting the on-site construction process. The top wall of the bull foot bracket 3 is also horizontally fixed and welded or installed with a double-piece I-beam 2 by high-strength bolts, forming a force boundary symmetrical to the side of the steel pipe column 1, ensuring that the entire bracket system is balanced in force, and avoiding deformation or structural offset caused by unilateral force.

[0041] The Bailey beam grid 4 comprises multiple Bailey beam units 411, which are fixedly connected and assembled together. The standardized component connections make the support system versatile and easy to assemble and disassemble. The Bailey beam grid 4 spans and is fixedly mounted on the double-jointed I-beams 2 on the steel pipe column 1 and the bull-foot bracket 3, respectively. It connects the support boundaries on both sides and evenly transfers loads. It also possesses excellent bending stiffness and mid-span stability, making it a significant advantage in the construction of long-span and curved ramps.

[0042] The interlocking grid 5 is installed above the Bailey beam grid 4. Its standardized interlocking components facilitate quick assembly and height adjustment, allowing for flexible placement of formwork support points based on the cross-sectional dimensions of the box girder. The interlocking grid 5 is used to mount the formwork, allowing for the integral cast-in-place construction of the box girder within the formwork. This ensures the formwork's stability and reliability throughout the construction process, preventing problems such as displacement and deformation, and improving forming accuracy and construction quality.

[0043] The steel rope net 6 winds from the bottom of one side of pier 9 to the top of pier 9 and covers the other side of pier 9, forming a surrounding sheathing structure around pier 9. The steel rope net 6 is clamped to pier 9 by circular steel wire ropes 61, enhancing its adhesion and fixing strength to pier 9. The ends of the Bailey beam grid 4 and the buckle grid 5 are fixed to the steel rope net 6 by connecting rods 62, forming a flexible auxiliary fixing system that provides effective damping and buffering in response to temporary lateral loads or structural vibrations. The steel rope net 6 forms an integral unit with the pier 9, ensuring overall stability. This is especially effective in areas where pier 9 is tall and the structural stress is complex, effectively preventing the upper support system from shaking or deflecting.

[0044] It should be emphasized that between two adjacent piers 9, multiple steel pipe columns 1 and multiple bull foot brackets 3 are installed respectively, which together constitute a composite support system for the Bailey beam grid 4 and the disc-shaped grid 5. Through this heterogeneous arrangement, the Bailey beam grid 4 spans between the steel pipe columns 1 on both sides and the double-piece I-beam 2 above the bull foot brackets 3, and the disc-shaped grid 5 is erected on the Bailey beam grid 4 to support the formwork and subsequent pouring operations. This structural arrangement not only ensures load-bearing stability, but also realizes the efficient use of space resources. The bull foot brackets 3 are installed on the pier 9 and occupy a small space, which is particularly suitable for areas with limited construction sites or where traffic needs to be guaranteed. At the same time, the steel pipe columns 1 and the bull foot brackets 3 are both prefabricated and installed, eliminating the need for large-scale full-floor scaffolding, effectively improving construction efficiency and reducing construction costs. It has the significant advantages of strong structural stability, high layout flexibility, and good adaptability.

[0045] Reference Figure 1 and Figure 3As shown, to adaptably connect the Bailey beam grid 4 and the disc-type grid 5 and facilitate length adjustment of the connecting rod 62, the connecting rod 62 comprises threaded rods 621 at each end and a sleeve 622 in the middle. The threaded rods 621 and sleeve 622 are threadedly connected, allowing for fine-tuning of the overall length to accommodate different spacing requirements. Climbing clips 623 are welded to each end of the threaded rods 621, facilitating quick attachment and removal, improving installation efficiency. The end hoops of the Bailey beam grid 4 and the disc-type grid 5 are equipped with pipe hoops 624. These hoops can be square or circular, depending on the cross-sectional shape of the components, and are welded with hanging rings 625, providing a secure attachment point. The carabiners 623 on the threaded rods 621 at each end mate with the hanging rings 625 and the steel rope net 6, respectively, forming a flexible tensioning unit. This effectively transmits tension at the ends, preventing concentrated force from causing localized structural instability, further enhancing the adaptability and safety of the overall structure in complex spaces and load environments.

[0046] Reference Figure 4-Figure 7 As shown, a first connector 7 and a second connector 70 are respectively installed between adjacent Bailey beam units 411. The first connector 7 is used not only to connect adjacent Bailey beam units 411, but also to simultaneously connect the vertical tubes 51 of the disc-shaped grid 5, thereby achieving spatial coordinated support between the Bailey beam structure and the disc-shaped grid. The second connector 70 is specifically used to enhance the lateral connection strength between the Bailey beam units 411. This arrangement effectively improves the stability and overall load-bearing performance of the connection between the Bailey beam grid 4 and the disc-shaped grid 5, solving the problem of local looseness or offset caused by the single connector in traditional support structures. It also mainly addresses the problem of poor connection and fixation of the vertical tubes of the Bailey beam grid 4 and the disc-shaped grid 5.

[0047] Specifically, a plurality of semi-cylinders 412 are welded to the sidewalls along the width direction between adjacent Bailey beam units 411. These semi-cylinders 412 are evenly distributed longitudinally along the Bailey beam units 411 and, during installation, are butted together to form a complete cylindrical structure 413, providing a stable positioning foundation for subsequent connection components. The outer wall of each semi-cylinder 412 is threaded for secure engagement with the locking cap 72. The first connector 7 and the second connector 70 have essentially the same structure, both comprising a U-shaped clip 71 and a locking cap 72. The U-shaped clip 71 includes a pair of clips 711 symmetrically arranged along the width direction. The clips 711 are provided with notches 7111 corresponding to the outer shape of the cylindrical body 413, for securing the cylindrical body 413 in place.

[0048] In terms of structural details, the sides of the clips 711 facing away from each other are provided with fastening grooves 7112. The fastening grooves 7112 are used to install the locking caps 72. The locking caps 72 are screwed onto the cylinder 413 via threads, so that the U-shaped clip 71 is firmly locked on both sides of the Bailey beam unit 411. This structural design not only improves the connection strength, but also facilitates disassembly and reuse during construction, which is suitable for the needs of frequent on-site adjustments. In different embodiments, to further improve the stable connection between Bailey beam units 411, an insert and slot structure can be provided between adjacent Bailey beam units 411. After the insert is inserted into the slot, a longitudinal limit function is formed, which effectively prevents relative slippage caused by load disturbance and improves the shear and torsion resistance of the overall frame. The U-shaped clip 71 is provided with multiple locking bolts 7113, which are used to be fixed to adjacent Bailey beam units 411 to further improve the fixing effect.

[0049] Reference Figure 7-Figure 9 As shown, to effectively connect the disc-shaped grid 5 and the Bailey beam grid 4, the first connector 7 also includes a fixed tube 73 structure. This fixed tube 73 is vertically fixed to the top of the U-shaped clamp 71 and is perpendicularly connected to the top wall of the Bailey beam. A plug rod 731 is slidably inserted into the fixed tube 73. The lower end of the plug rod 731 is inserted into the pre-defined plug slot 4111 in the top wall of the Bailey beam to achieve longitudinal positioning. The upper end of the plug rod 731 is fixedly connected to an abutment plate 7311 for surface contact support with the end of the vertical tube 51 of the disc-shaped grid 5.

[0050] To ensure connection stability, an elastic member 732 is positioned between the abutment plate 7311 and the bottom of the fixed tube 73. This elastic member 732 generates a preload during insertion, thereby enhancing the installation stability of the vertical tubes 51 of the disc-shaped mesh frame 5. Once inserted into the fixed tube 73, the vertical tubes 51 of the disc-shaped mesh frame 5 directly abut against the abutment plate 7311, forming a stable connection that integrates "insertion, position limiting, and elastic support." This effectively mitigates the risks of vertical displacement and disengagement associated with traditional connection structures. In this embodiment, the elastic member 732 is a spring 7321. In other embodiments, the elastic member 732 could alternatively be a spring or rubber block.

[0051] Furthermore, to enhance the stability of the vertical tube 51 of the buckle grid 5, a placement slot 74 for placing sand is provided on the outer wall of the fixed tube 73. This placement slot 74 is connected to the internal space of the fixed tube 73 via a connecting hole 741 in the tube wall. A retaining ring 742 is fixedly mounted on the abutment plate 7311 at the top of the plug rod 731. This structure is used to block the connecting hole 741 in the initial state to prevent sand from leaking in prematurely. When the vertical tube 51 of the buckle grid 5 is inserted and presses down on the abutment plate 7311, the abutment plate 7311 moves downward, driving the retaining ring 742 away from the connecting hole 741. The connecting hole 741 is opened, allowing the sand in the placement slot 74 to smoothly fill the quicksand gap 743 under the action of gravity.

[0052] The quicksand gap 743 is located between the vertical tube 51 of the buckle grid 5 and the inner wall of the fixed tube 73. After being filled with sand, the fixed tube 73 can be slightly vibrated by a vibration device such as an electric hammer to fully flow and compact the sand, thereby forming a high-friction wrapping effect, which stabilizes and reinforces the vertical tube 51. To further enhance the limiting effect, a ridge 511 structure is integrally formed on the vertical tube 51 of the buckle grid 5. After the vertical tube 51 is inserted into the fixed tube 73, the ridge 511 is in close contact with the inner wall of the tube, performing multiple functions of limiting position, resisting pullout, and stabilizing the vertical direction.

[0053] Furthermore, in order to improve the sealing and controllable release functions of sand, a sand inlet hole 7421 is also opened on the bottom wall of the retaining ring 742, and a sand inlet ring groove 7422 is provided on its outer wall near the bottom and corresponding to the position of the sand inlet hole 7421 along the circumferential direction. Sand can not only enter the quicksand gap 743 through the connecting hole 741, but also fall into the sand inlet ring groove 7422 from the sand inlet hole 7421, forming a certain friction self-locking effect on the retaining ring 742, thereby preventing it from unexpected rebound or displacement during construction.

[0054] As an optional embodiment, a cover 75 is threaded onto the top of the fixed cylinder 73. This cover 75 can be opened or closed according to the specific working conditions, preventing sand leakage and dust, and providing post-construction protection. This removable cover 75 structure not only ensures the use of the function, but also facilitates subsequent maintenance and recycling.

[0055] Reference Figure 7 and Figure 10 As shown, the Bailey beam truss 4 includes multiple rows of Bailey beam units 41, with multiple sets of series members 8 positioned between the rows of Bailey beam units 41 to achieve serial connection and overall reinforcement of the Bailey beam units 41. Each set of series members 8 includes a pair of threaded sleeves 81, a tie stud 82, and a clip 83. The threaded sleeves 81 are threadedly connected to the ends of the tie studs 82, and the clips 83 are fixedly connected to the ends of the corresponding threaded sleeves 81. The clips 83 are U-shaped, with their end walls provided with clearance grooves 831 for accommodating the cylindrical bodies 413. These clips 83 can be plugged into the cylindrical bodies 413 formed by the Bailey beam units 411. The locking caps 72 are located within the clips 83 and are used to clamp the clips 83 to ensure stable fixation. By rotating the tie studs 82, the spacing between adjacent Bailey beam units 41 can be adjusted and their relative positions can be fixed, thereby improving the structural stability and load-bearing capacity of the overall truss.

[0056] Furthermore, if Figure 1 and Figure 3As shown, to enhance the connection reliability between the steel rope net 6 and the pier 9, the pier 9 is pre-embedded with multiple embedded screws 42. A pair of pressure plates 43 are slidably mounted on each embedded screw 42. The pressure plates 43 are clamped and fixed on both sides of the steel rope net 6. Nuts 431 are also threadedly connected to the embedded screws 42. The nuts 431 can abut and compress the pair of pressure plates 43, thereby stabilizing the position of the steel rope net 6. Wooden strips 44 are placed between the steel rope net 6 and the pier 9 to buffer the compression stress and improve the fixation reliability of the steel rope net 6.

[0057] The ox-leg bracket 3 is a right-angled triangle structure, assembled from multiple double-jointed I-beams 2. It is fixed to the surface of the pier 9 via tensioning screws 31, and its structural rigidity and stability support the entire Bailey beam grid 4 system, ensuring the safety and reliability of the support system during construction.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A modular support for the construction of high-pier cast-in-situ box girders for interchange ramps with a very small radius, characterized in that: include: A plurality of steel pipe columns (1) are provided and are close to one side pier column (9); a concrete base (11) is prefabricated at the bottom of each steel pipe column (1) and fixedly connected by embedded steel plates (12) and anchor bolts (13); double-jointed I-beams (2) are fixedly provided horizontally on the top walls of the plurality of steel pipe columns (1); and a flat coupling frame (14) is fixedly connected between adjacent steel pipe columns (1); The ox-foot bracket (3) is provided with multiple groups and fixed on the side wall of the pier column (9) on the other side, and the top wall of the ox-foot bracket (3) is also fixedly provided with a double-piece I-beam (2) in a horizontal manner; A Bailey beam grid (4), the Bailey beam grid (4) comprising a plurality of Bailey beam monomers (411), the plurality of Bailey beam monomers (411) being fixedly spliced ​​together to form the Bailey beam grid (4), the Bailey beam grid (4) being fixedly mounted across the double-jointed I-beams (2) on the steel pipe column (1) and the bull foot bracket (3); A buckle grid (5), the buckle grid (5) is installed above the Bailey beam grid (4), and the buckle grid (5) is used to install a template to cast the box beam in the template; A steel rope net (6) is wound from the bottom of one side of the pier (9) to the top of the pier (9) and covers the other side of the pier (9). The steel rope net (6) is clamped on the pier (9) by a circular steel wire rope (61). The ends of the Bailey beam grid (4) and the buckle grid (5) are fixed to the steel rope net (6) by connecting rods (62).

2. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 1 is characterized in that: The connecting rod (62) comprises threaded rods (621) at both ends and a sleeve (622) in the middle, the threaded rod (621) is threadedly connected to the sleeve (622), and both ends of the threaded rod (621) are fixedly provided with climbing buckles (623), the end hoops of the Bailey beam grid (4) and the disc buckle grid (5) are provided with pipe hoops (624), and the pipe hoops (624) are fixedly provided with hanging rings (625), and the climbing buckles (623) on the threaded rods (621) at both ends are respectively hooked and connected with the hanging rings (625) and the steel rope net (6).

3. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 1 is characterized in that: A first connecting member (7) and a second connecting member (70) are respectively provided between adjacent Bailey beam monomers (411); the first connecting member (7) is used to simultaneously connect the adjacent Bailey beam monomers (411) and the vertical pipes (51) of the buckle grid (5); and the second connecting member (70) is used to connect the adjacent Bailey beam monomers (411).

4. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 3 is characterized in that: A plurality of semi-cylinders (412) are fixedly provided on both side walls in the width direction between adjacent Bailey beam monomers (411), and the semi-cylinders (412) are formed into a cylindrical body (413) in pairs. The outer walls of the semi-cylinders (412) are provided with threads. The first connecting member (7) and the second connecting member (70) both include a U-shaped clip (71) and a locking cap (72). The U-shaped clip (71) includes clips (711) on both sides, and the clips (711) are provided with A notch groove (7111) is provided for the cylindrical body (413) to pass through, and fastening grooves (7112) for accommodating the locking caps (72) are provided on the mutually facing surfaces of the clips (711) on both sides. The locking caps (72) are used to be threadedly connected to the cylindrical bodies (413) formed by the two semi-cylinders (412). A plurality of locking bolts (7113) are passed through the U-shaped clip (71) to be passed through and fixed on the adjacent Bailey beam monomers (411).

5. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 4 is characterized in that: The first connecting member (7) further comprises a fixing tube (73), the fixing tube (73) being fixedly connected to the top of the U-shaped clip (71), a plug-in rod (731) being slidably inserted into the fixing tube (73), a plug-in slot (4111) for plugging the plug-in rod (731) is provided on the top wall of the Bailey beam monomer (411), an abutment plate (7311) is fixedly provided on the top of the plug-in rod (731), an elastic member (732) is provided between the abutment plate (7311) and the bottom wall of the fixing tube (73), and the vertical tube (51) of the buckle grid (5) is used for plugging into the fixing tube (73) and abutting against the abutment plate (7311).

6. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 5 is characterized in that: The outer wall of the fixed cylinder (73) is provided with a placement groove (74) for placing sand, a communication hole (741) is opened between the placement groove (74) and the fixed cylinder (73), and a retaining ring (742) is fixedly provided on the abutment plate (7311). The retaining ring (742) is in the initial state of blocking the communication hole (741). When the vertical pipe (51) of the buckle grid (5) abuts against the abutment plate (7311), the retaining ring (742) is in the initial state of blocking the communication hole (741). After it moves downward, the retaining ring (742) is in the position of opening the communicating hole (741), wherein a quicksand gap (743) is provided between the vertical tube (51) of the buckle grid (5) and the inner wall of the fixed cylinder (73), and a convex edge (511) is provided on the vertical tube (51) of the buckle grid (5), and the convex edge (511) abuts against the inner wall of the fixed cylinder (73) after the vertical tube (51) is inserted into the fixed cylinder (73).

7. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 6 is characterized in that: The bottom wall of the retaining ring (742) is provided with a sand inlet hole (7421), and the outer wall of the retaining ring (742) is provided with a sand inlet ring groove (7422) along the circumferential direction at a position close to the bottom and located at the position of the sand inlet hole (7421); And / or, the top of the fixed cylinder (73) is threadedly connected with a sealing cover (75).

8. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 4 is characterized in that: The Bailey beam grid (4) includes multiple rows of Bailey beam units (41), multiple groups of series components (8) are arranged between the multiple rows of Bailey beam units (41), each group of series components (8) includes a pair of screw sleeves (81), a tension stud (82) and a clamp (83), the pair of screw sleeves (81) are threadedly connected to the two ends of the tension stud (82), the clamp (83) is fixedly connected to the ends of the pair of screw sleeves (81), the clamp (83) is U-shaped and has an avoidance groove (831) on its end wall for avoiding the cylinder (413), the clamp (83) is used to be inserted into the cylinder (413), and the locking cap (72) is located in the clamp (83) and is used to clamp the clamp (83).

9. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 1 is characterized in that: A plurality of embedded screw rods (42) are embedded in the pier column (9), and a pair of pressing plates (43) are slidably sleeved on each embedded screw rod (42). The pair of pressing plates (43) are pressed on the steel rope net (6). The embedded screw rods (42) are also threadedly connected with nuts (431), and the nuts (431) are used to abut against the pair of pressing plates (43). A wooden strip board (44) is provided between the steel rope net (6) and the pier column (9).

10. The combined support for the construction of high-pier cast-in-situ box beams for extremely small-radius interchange ramps according to claim 1, characterized in that: The bull foot bracket (3) is in the shape of a right triangle and is also made of a plurality of double-jointed I-beams (2). The bull foot bracket (3) is fixed to the pier column (9) by means of a tension screw (31).

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