Supporting system for whole-breadth wide box girder

Abstract

The invention belongs to the technical field of bridge construction, and particularly discloses a supporting system for a whole-breadth wide box girder, which comprises a pier body supported at the bottom of the box girder, a steel pipe upright post unit, a triangular truss bracket unit, an anchoring unit, a bearing cross beam unit, a distribution beam and template unit and a temporary consolidation unit, the steel pipe stand column units and the triangular truss bracket units jointly form a vertical bearing and cantilever supporting structure for the box girder. The triangular truss bracket unit is fixed on the pier body by the anchoring unit; the bearing cross beam unit is arranged above the triangular truss bracket unit; the distributive girder and the template unit are supported between the bearing cross beam unit and the box girder; and the temporary consolidation unit is connected with a box girder bottom plate and a bearing platform at the bottom of the pier body. The high-bearing-capacity and high-stability supporting requirements of the whole wide box girder can be met.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and more specifically to a support system for a full-width box girder. Background Technology

[0002] In the field of municipal and highway bridge construction, wide box girders (30m or more in width, such as 33m wide box girders) have become a common form of superstructure for long-span, high-pier bridges due to their advantages such as good integrity, driving comfort, and aesthetically pleasing alignment. The concrete pouring of wide box girders requires a reliable temporary support system. Its load-bearing capacity, overall stability, settlement control effectiveness, and construction adaptability directly determine the construction quality, structural safety, and project progress.

[0003] Currently, the commonly used temporary support technologies for bridge box girder construction mainly include three types: full-span scaffolding, triangular brackets, and steel pipe scaffolding. Each type of technology has obvious limitations and cannot meet the comprehensive needs of wide box girder construction, high piers, soft soil foundations, and cross-construction. Full-span scaffolding method: This method uses a support system composed of ground-mounted uprights, horizontal bars, and scissor braces, and is only suitable for construction of low-pier, small-span box girders. It requires a large number of scaffolding components and foundation treatment materials, resulting in high material costs and complex erection and dismantling procedures, thus extending the overall construction period. In soft soil foundation areas, uneven settlement is prone to occur, making it difficult to precisely control scaffolding deformation and ensuring the casting alignment of wide box girders.

[0004] Triangular bracket method: Triangular brackets are set up on the pier to bear the upper load, which is suitable for the construction of box girders with medium and small widths. However, its single-system bearing capacity is limited. When facing box girders with a width of more than 30m, the stress section and support range of the bracket are insufficient, which can easily lead to local deformation and insufficient overall bearing capacity. It cannot meet the support requirements of box girders with large width and large load.

[0005] Steel pipe scaffolding method: This method uses single or row-row steel pipe columns as vertical supports, suitable for high-pier bridge construction scenarios. However, the steel pipe columns are independently stressed, with weak lateral and longitudinal constraints, resulting in poor overall lateral displacement resistance. Under wind loads and construction eccentric loads, they are prone to lateral instability. Furthermore, the support system relies on the bearing capacity of the foundation, making settlement control difficult in soft soil foundations. Additionally, the scaffolding occupies the lower construction space, making it unsuitable for the needs of overlapping vertical operations.

[0006] In summary, existing support technologies cannot simultaneously solve technical problems such as insufficient load-bearing capacity of the entire wide box girder, poor stability of high piers, uncontrolled settlement of soft soil foundations, and spatial conflicts in cross-construction. The industry urgently needs a combined support system that has strong load-bearing capacity, good stability, is adaptable to wide box girders and complex geology, and is easy to construct, so as to achieve integrated construction support and temporary consolidation of wide box girders, thereby improving construction efficiency and structural safety. Summary of the Invention

[0007] This invention provides a support system for a full-width box girder, which aims to meet the high load-bearing capacity and high stability support requirements of the full-width box girder.

[0008] The present invention is achieved through the following technical solution: a support system for a full-width box girder, including a pier body supported at the bottom of the box girder, and further including a steel pipe column unit, a triangular truss bracket unit, an anchoring unit, a load-bearing crossbeam unit, a distribution beam and formwork unit, and a temporary consolidation unit; The steel pipe column unit and the triangular truss bracket unit together form a vertical load-bearing and cantilever support structure for the box girder; The anchoring unit fixes the triangular truss bracket unit to the pier body; The load-bearing crossbeam unit is located above the triangular truss bracket unit; The distribution beam and the template unit are supported between the load-bearing crossbeam unit and the box girder; The temporary consolidation unit is connected to the bottom plate of the box girder and the abutment at the bottom of the pier.

[0009] Compared with existing technologies, this solution has the following advantages and beneficial effects: In this scheme, the steel pipe column unit and the triangular truss bracket unit together form a vertical load-bearing and cantilever support structure, which greatly improves the overall load-bearing capacity and structural stiffness of the support system, reduces cantilever situations, can meet the large load support requirements of the wide box girder, effectively avoids deformation and instability of the support structure, and ensures construction safety.

[0010] The anchoring unit reliably fixes the triangular truss bracket unit to the pier body, so that the upper load is directly transferred to the main structure of the pier body, reducing the dependence on the foundation. Under soft soil foundation conditions, it can significantly control the settlement of the support system and improve the adaptability of construction.

[0011] The load-bearing crossbeam unit works in conjunction with the distribution beam and formwork unit to evenly distribute and transfer the casting load of the box girder, ensuring balanced support force, improving the casting line and construction accuracy of the box girder, and meeting the construction requirements of casting the entire wide box girder in one go.

[0012] The temporary consolidation unit connects the bottom plate of the box girder with the bottom abutment of the pier, realizing the integration of construction support and temporary consolidation, enhancing the overall stability of the high pier under construction conditions, and optimizing the support space layout to meet the space avoidance requirements of cross-construction.

[0013] The various units in this scheme work together to meet the high load-bearing capacity and high stability support requirements of the entire wide box girder.

[0014] Furthermore, the steel pipe column unit includes multiple steel pipe columns, which are distributed on both sides of the load-bearing beam unit and supported between the load-bearing beam unit and the municipal bridge.

[0015] Arranging steel pipe columns on both sides of the load-bearing beam unit and supporting it between the load-bearing beam unit and the existing municipal bridge can effectively distribute the load of the cantilever section, optimize the large cantilever stress to simple support stress, significantly reduce the bending moment and deformation of the load-bearing beam and bracket, and improve the overall stiffness and safety of the support system. At the same time, using the existing municipal bridge structure as the support foundation, there is no need to add a large number of pile foundations in the riverbed or soft soil foundation, reducing the amount of foundation treatment work, construction costs and settlement risks.

[0016] Furthermore, the triangular truss bracket unit is supported between the pier body and the load-bearing beam unit, and at least two triangular truss bracket units are arranged on both sides of the pier body. Supporting rods are connected to the other two sides of the pier body. The supporting rods are inclined, and the two ends of the supporting rods are respectively connected to the pier body and the load-bearing beam unit.

[0017] The triangular truss bracket unit is supported between the pier body and the load-bearing beam unit, and at least two sets of triangular truss bracket units are symmetrically arranged on both sides of the pier body. At the same time, inclined support members are set on the other two sides of the pier body, forming a two-way symmetrical support for the pier body and a composite force system of truss and inclined bracing. This significantly improves the lateral stiffness and anti-lateral displacement capacity of the support system, effectively avoiding lateral instability during the construction of high piers. The symmetrical arrangement and two-way support ensure that the load is evenly distributed to the pier body, significantly improving the overall stability and load-bearing safety, and meeting the force requirements of large-span and large-load construction of wide box girders.

[0018] Furthermore, the triangular truss bracket unit includes a bracket crossbeam and a bracket inclined beam. The bracket crossbeam is arranged horizontally, and the bracket inclined beam is arranged at an inclination. One end of the bracket crossbeam and the bracket inclined beam are connected to the pier body, and the end of the bracket inclined beam away from the pier body is connected to the bracket crossbeam. The bracket crossbeam, the bracket inclined beam and the pier body form a triangular support structure.

[0019] In this scheme, the bracket crossbeam, bracket inclined beam and pier body together form a stable triangular support structure, which can improve the compressive, shear and bending resistance of the triangular truss bracket unit, effectively reduce the deformation of the support structure, greatly improve the vertical bearing capacity and overall stability of the wide box girder, and ensure the safety of construction under heavy loads.

[0020] Furthermore, the anchoring unit includes a tie rod and fasteners. The tie rod is pre-embedded laterally in the pier body, and the end of the tie rod is connected to the end of the triangular truss bracket unit through fasteners.

[0021] The tie rods are pre-embedded laterally in the pier body and connected to the ends of the triangular truss bracket units through fasteners. This allows the load on the brackets to be reliably and directly transferred to the main structure of the pier body, preventing the brackets from slipping or overturning, and significantly improving the anchoring strength and structural safety of the connection nodes. At the same time, it achieves a rigid connection between the support system and the pier body, enhancing the overall anti-overturning and anti-slip capabilities and ensuring the stability of the wide box girder construction.

[0022] Furthermore, a node box is connected to one end of the bracket crossbeam and the bracket inclined beam that connect to the pier body. The node box is fixed to the pier body by the tie rod and fasteners. A pre-embedded steel bar is also connected to the node box, and one end of the pre-embedded steel bar is pre-embedded on one side of the pier body. A pad is inserted between the node box and the pier body.

[0023] The bracket crossbeam and bracket inclined beam are connected to the pier body through the node box and fixed with pre-embedded tie rods, fasteners, pre-embedded steel bars and pads. This can expand the contact area of ​​the force-bearing structure, disperse the concentrated stress at the node, and avoid local crushing or deformation at the connection. The pre-embedded steel bars further enhance the anchoring reliability and pull-out and shear resistance of the node and the pier body. The pads can adjust the installation accuracy and ensure uniform force transmission. Overall, the rigidity, strength and construction safety of the connection node are improved, ensuring the stability and reliability of the support system under large loads.

[0024] Furthermore, the load-bearing beam unit includes multiple load-bearing beams arranged laterally and multiple load-bearing beams arranged longitudinally, with the multiple load-bearing beams arranged laterally and the multiple load-bearing beams arranged longitudinally intersecting perpendicularly.

[0025] The horizontal and vertical load-bearing beams are arranged perpendicularly to form a grid-like load-bearing system with bidirectional force. This system can evenly distribute the casting load of the upper box girder to the lower steel pipe column unit and triangular truss bracket unit, avoiding local stress concentration. It significantly improves the overall stiffness, bending capacity and structural stability of the load-bearing beam unit, ensuring that the wide-section box girder is supported with balanced force and controllable alignment.

[0026] Furthermore, the distribution beam and template unit includes multiple sets of frames, the shapes of which are adapted to the outline shape of the box girder, and the multiple sets of frames are distributed sequentially at intervals along the length direction of the box girder.

[0027] The frame shape is adapted to the outline of the box girder and is arranged at intervals along the length direction, which can accurately fit the shape of the box girder and ensure that the box girder has a smooth line and accurate dimensions after pouring. The interval frame can evenly transfer the upper concrete load, avoid excessive local stress, reduce the self-weight of the support, improve installation efficiency, and meet the construction accuracy requirements of pouring the entire wide box girder in one go.

[0028] Furthermore, the temporary consolidation unit includes support columns installed on both sides of the pier body; the support columns are equipped with threaded steel bars, and the two ends of the support columns are respectively connected to the bottom plate of the box girder and the pier cap at the bottom of the pier body through the threaded steel bars; the support columns are filled with concrete.

[0029] In this scheme, the supporting columns, together with the built-in threaded steel bars, connect the bottom plate of the box girder and the abutment respectively. Concrete is poured into the columns to form a rigid temporary consolidation structure, which significantly improves the overall stability and anti-overturning capacity of the box girder during the construction stage. The concrete poured into the columns greatly improves the compressive and bending stiffness, and the threaded steel bars achieve reliable anchoring, effectively ensuring the structural safety of high piers and wide box girders throughout the entire process of pouring and tensioning, and realizing the integration of support and consolidation.

[0030] Furthermore, the top of the triangular truss bracket unit is provided with a drop block, which includes an upper wedge box and a lower wedge box. The ends of the upper wedge box and the lower wedge box facing each other are wedge surfaces. When the upper wedge box and the lower wedge box overlap, they form a rectangular structure. The upper wedge box and the lower wedge box can be fixed by fasteners to bear the upper load. When the fasteners are removed, the upper wedge box and the lower wedge box can slide relative to each other, thereby reducing the overall height of the drop block to form a removal gap.

[0031] In this design, the top of the triangular truss bracket unit is equipped with a drop block consisting of an upper wedge box and a lower wedge box. When the wedge surfaces of the two wedge boxes are in contact and overlap, they form a rectangular load-bearing structure. The structure can stably bear the upper load by fastening it with fasteners. After the fasteners are removed, the upper and lower wedge boxes can slide relative to each other, reducing the overall height and quickly creating a safe dismantling gap. This eliminates the need for external force to forcibly support or cut the structure, enabling the support system to be dismantled without damage, conveniently, and safely. This significantly improves the efficiency of formwork removal and system unloading, and avoids damage to the box girder structure. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a top view of an embodiment of a support system for a full-width box girder according to the present invention; Figure 2 for Figure 1 Sectional view of AA; Figure 3 for Figure 1 Sectional view of BB; Figure 4 for Figure 1 Sectional view of CC; Figure 5 for Figure 3 A magnified view of a section at point D; Figure 6 for Figure 3 A magnified view of a section at point F in the middle; Figure 7 for Figure 3 A magnified view of a section at point E in the middle; Figure 8 This is a side view of a temporary consolidation unit, a box girder, and a pier in an embodiment of a support system for a full-width box girder according to the present invention. Figure 9 This is a front view of a temporary consolidation unit, a box girder, and a pier in an embodiment of a support system for a full-width box girder according to the present invention.

[0033] The attached diagram shows the markings and corresponding component names: 1. Steel pipe column, 2. Triangular truss bracket unit, 201 bracket beam, 202 bracket inclined beam, 3. Anchoring unit, 301 tie rod, 4. Load-bearing beam unit, 5. Frame, 6. Supporting pipe column, 601 threaded steel bar, 602 connector, 7. Flange, 8. Support rod, 9. Unloading block, 901 upper wedge box, 902 lower wedge box, 10. Box girder, 11. Node box, 12. Pad plate, 13. Embedded steel bar, 14. Pier body, 141. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0035] As one embodiment of this application, such as Figures 1-4 As shown, this embodiment provides a support system for a full-width box girder, including a pier 14 supported at the bottom of the box girder 10, as well as a steel pipe column unit, a triangular truss bracket unit 2, an anchoring unit 3, a load-bearing crossbeam unit 4, a distribution beam and formwork unit, and a temporary consolidation unit. The steel pipe column unit and the triangular truss bracket unit 2 together form a vertical load-bearing and cantilever support structure for the box girder 10. In this embodiment, the steel pipe column unit includes multiple steel pipe columns 1, which are distributed on both sides of the load-bearing beam unit 4 and supported between the load-bearing beam unit 4 and the municipal bridge. They can support the upper load-bearing beam unit 4 and reduce cantilever. In this embodiment, the diameter of the steel pipe column 1 is 820mm and the wall thickness is 10mm. There are six steel pipe columns 1, arranged in two rows laterally and three steel pipe columns 1 in each row longitudinally. The two rows of steel pipe columns 1 are located on both sides of the load-bearing beam unit 4. Anchoring unit 3 fixes triangular truss bracket unit 2 onto pier body 14; The load-bearing crossbeam unit 4 is located above the triangular truss bracket unit 2; The distribution beam and formwork unit are supported between the load-bearing crossbeam unit 4 and the box girder 10; The temporary consolidation unit is connected to the bottom plate of the box girder 10 and the pile cap 141 at the bottom of the pier body 14.

[0036] In one embodiment, such as Figure 3 As shown, the triangular truss bracket unit 2 is supported between the pier body 14 and the load-bearing beam unit 4, and at least two triangular truss bracket units 2 are arranged on both sides of the pier body 14 (e.g., Figure 1 and Figure 2 As shown), Figure 2 As shown, support rods 8 are connected to the other two sides of the pier body 14. The support rods 8 are inclined and their two ends are connected to the pier body 14 and the load-bearing beam unit 4, respectively. The support rods 8, the load-bearing beam unit 4 and the pier body 14 form a triangular support structure, which can further enhance the supporting force.

[0037] In one embodiment, such as Figure 3 As shown, in this embodiment, the triangular truss bracket unit 2 is supported between the cast-in-place pier body 14 and the load-bearing crossbeam unit 4, and plays a supporting role for the upper load. Specifically, the triangular truss bracket unit 2 includes a bracket crossbeam 201 and a bracket inclined beam 202. The bracket crossbeam 201 is arranged horizontally, and the bracket inclined beam 202 is arranged at an inclination. One end of the bracket crossbeam 201 and the bracket inclined beam 202 are connected to the pier body 14. The end of the bracket inclined beam 202 away from the pier body 14 is connected to the bracket crossbeam 201 by bolts. The bracket crossbeam 201, the bracket inclined beam 202 and the pier body 14 form a triangular support structure.

[0038] In this embodiment, both the bracket crossbeam 201 and the bracket inclined beam 202 adopt a double-span I-beam structure. Both the bracket crossbeam 201 and the bracket inclined beam 202 are connected to the pier body 14 via anchoring units 3. Specifically: [The text abruptly ends here, likely due to an incomplete sentence or missing information.] Figure 3 , Figure 5 and Figure 6 As shown, the anchoring unit 3 in this embodiment includes a tie rod 301 and a fastener. The tie rod 301 is pre-embedded laterally in the pier body 14, and the end of the tie rod 301 is connected to the end of the triangular truss bracket unit 2 through the fastener. In this embodiment, the fastener is a nut. The two ends of the tie rod 301 in the anchoring unit 3 are pulled against each other on both sides of the already poured pier body 14, and are fixed to the ends of the bracket beams 201 and the bracket inclined beams 202 on both sides of the pier body 14 by bolts, so as to provide support for the upper load and transfer the load to the pier body 14.

[0039] In one embodiment, such as Figure 3 , Figure 5 and Figure 6As shown, in this embodiment, the ends of the bracket beam 201 and the bracket inclined beam 202 connected to the pier body 14 are all bolted to the node box 11. The node box 11 and the pier body 14 are fixed by tie rods 301 and fasteners. In this embodiment, the node box 11 is also connected to the embedded steel rod 13. One end of the embedded steel rod 13 is embedded on one side of the pier body 14. In this embodiment, the material of the embedded steel rod 13 is 45# steel with a bending strength of 355Mpa. The embedded steel rod 13 can further improve the support strength of the triangular truss bracket unit 2. In this embodiment, a pad 12 is inserted between the node box 11 and the pier body 14. The pad 12 is a steel plate. The pad 12 needs to be ground according to the slope of the pier body 14. In this embodiment, by inserting the pad 12, the node box 11 can be tightened, thereby improving the support stability of the triangular truss bracket unit 2.

[0040] In one embodiment, such as Figure 1 As shown, the load-bearing beam unit 4 includes multiple load-bearing beams arranged laterally and multiple load-bearing beams arranged longitudinally. The multiple load-bearing beams arranged laterally and multiple load-bearing beams arranged longitudinally are arranged perpendicularly and intersecting each other. All load-bearing beams are made of steel structure. The load-bearing beams arranged laterally and longitudinally form a grid-like load-bearing system with bidirectional force, which can improve the overall stiffness, bending bearing capacity and structural stability of the load-bearing beam unit 4.

[0041] In one embodiment, such as Figure 1 and Figure 2 As shown, the distribution beam and formwork unit includes multiple sets of frames 5, such as... Figure 3 and Figure 4 As shown, the shapes of the multiple sets of frames 5 are all adapted to the outline shape of the box girder 10, and the multiple sets of frames 5 are distributed sequentially at intervals along the length direction of the box girder 10.

[0042] In this embodiment, multiple sets of frames 5 can evenly distribute the upper load. They are molds for the concrete pouring of the box girder 10, located on the upper part of the load-bearing crossbeam unit 4, and connected to the load-bearing crossbeam unit 4 by spot welding.

[0043] In one embodiment, such as Figure 8 and Figure 9As shown, the temporary consolidation unit includes support columns 6 set on both sides of the pier body 14; in this embodiment, the support columns 6 are set on both sides of the width direction of the box girder 10, and five support columns 6 are set on each side, with the five support columns 6 distributed at intervals. In this embodiment, threaded steel bars 601 are set inside the support columns 6, and concrete is poured into the support columns 6. The two ends of the support columns 6 are respectively connected to the bottom plate of the box girder 10 and the bearing platform 141 at the bottom of the pier body 14 through the threaded steel bars 601. In this embodiment, the top of the threaded steel bars 601 passes through the bottom of the box girder 10 and is fixed by nuts, and the bottom of the threaded steel bars 601 passes into the bearing platform 141 at the bottom of the pier body 14, and the bottom of the support columns 6 is connected to the bearing platform 141 of the pier body 14 through flanges 7.

[0044] In this embodiment, adjacent support columns 6 are connected by connectors 602. In this embodiment, connectors 602 are double-section steel structures, and the connection points are fixed by welding.

[0045] In one embodiment, such as Figure 2 As shown, in this embodiment, one end of the support rod 8 is fixed to the load-bearing beam unit 4 by bolts, and the other end of the support rod 8 is connected to the pier body 14 by the anchoring unit 3, just like the triangular truss bracket unit 2.

[0046] In one embodiment, such as Figure 3 and Figure 7 As shown, in this embodiment, the top of the triangular truss bracket unit 2 is provided with a drop block 9. The drop block 9 includes an upper wedge box 901 and a lower wedge box 902. The ends of the upper wedge box 901 and the lower wedge box 902 that face each other are wedge surfaces. When the upper wedge box 901 and the lower wedge box 902 overlap, they form a rectangular structure. The upper wedge box 901 and the lower wedge box 902 can be fixed by fasteners to bear the upper load. In this embodiment, the fasteners are bolts. When the bolts are removed, the upper wedge box 901 and the lower wedge box 902 can slide relative to each other, thereby reducing the overall height of the drop block 9 to form a removal gap.

[0047] In this embodiment, during installation, the upper wedge box 901 and the lower wedge box 902 are joined together to form a rectangular structure, and the upper wedge box 901 and the lower wedge box 902 are fixed with bolts to bear the upper load. At this time, they are in a tight state without gaps. When the combined support system of the present invention needs to be dismantled after construction, the bolts are released to allow the upper wedge box 901 and the lower wedge box 902 to slide down relative to each other, thereby forming a gap in the upper part, which facilitates the dismantling of each component and thus facilitates demolding.

[0048] In this invention, the steel pipe column unit is connected to the already constructed lower municipal bridge using pre-embedded steel plates. The triangular truss bracket unit 2 is custom-made by the manufacturer and assembled on-site. The pre-embedded parts are reserved and embedded during the construction of pier 14. The anchoring unit 3 is reserved and embedded during the construction of pier 14. The distribution beam and formwork system are custom-made by the manufacturer and assembled and adjusted on-site. After the temporary consolidation unit and the zero block are poured, the concrete support beam is placed, and the precision-rolled threaded steel 601 is tensioned and fixed using jacks.

[0049] This invention: 1) Strong bearing capacity: The combined system can withstand 8140.66KN of support reaction force; This invention adopts a triangular bracket and steel pipe column combined support system for the entire wide box girder, which optimizes the large cantilever structure into a simply supported structure, making the stress more reasonable. The use of the already poured box girder 10 of the municipal bridge to support the upper load is more solid, avoiding the need to drive more and deeper steel pipe piles in the riverbed and soft soil foundation in the conventional way; (2) Good stability: Concrete is poured inside the support column 6 to improve compressive and bending resistance; (3) Strong adaptability: suitable for wide box girders, high piers, and soft soil foundations; (4) Convenient construction: Modular design, easy to install and dismantle; (5) Safe and reliable: Multiple anchoring and protection measures are set up, such as temporary consolidation units, making it safer and more reliable.

[0050] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A support system for a full-width box girder, comprising a pier supporting the bottom of the box girder, characterized in that, It also includes steel pipe column units, triangular truss bracket units, anchoring units, load-bearing beam units, distribution beam and formwork units, and temporary consolidation units; The steel pipe column unit and the triangular truss bracket unit together form a vertical load-bearing and cantilever support structure for the box girder; The anchoring unit fixes the triangular truss bracket unit to the pier body; The load-bearing crossbeam unit is located above the triangular truss bracket unit; The distribution beam and the template unit are supported between the load-bearing crossbeam unit and the box girder; The temporary consolidation unit is connected to the bottom plate of the box girder and the abutment at the bottom of the pier.

2. The support system for a full-width box girder according to claim 1, characterized in that, The steel pipe column unit includes multiple steel pipe columns, which are distributed on both sides of the load-bearing beam unit and supported between the load-bearing beam unit and the municipal bridge.

3. A support system for a full-width box girder according to claim 1, characterized in that, The triangular truss bracket unit is supported between the pier body and the load-bearing beam unit, and at least two triangular truss bracket units are arranged on both sides of the pier body. Supporting rods are connected to the other two sides of the pier body. The supporting rods are inclined and their two ends are respectively connected to the pier body and the load-bearing beam unit.

4. A support system for a full-width box girder according to claim 1, characterized in that, The triangular truss bracket unit includes a bracket crossbeam and a bracket inclined beam. The bracket crossbeam is arranged horizontally, and the bracket inclined beam is arranged at an inclination. One end of the bracket crossbeam and the bracket inclined beam are connected to the pier body, and the end of the bracket inclined beam away from the pier body is connected to the bracket crossbeam. The bracket crossbeam, the bracket inclined beam and the pier body form a triangular support structure.

5. A support system for a full-width box girder according to claim 4, characterized in that, The anchoring unit includes a tie rod and fasteners. The tie rod is pre-embedded laterally in the pier body, and the end of the tie rod is connected to the end of the triangular truss bracket unit through fasteners.

6. A support system for a full-width box girder according to claim 5, characterized in that, The bracket crossbeam and the bracket inclined beam are connected to the pier body at one end, and the node box is fixed to the pier body by the tie rod and fasteners. The node box is also connected to the embedded steel bar, one end of which is embedded in one side of the pier body. A pad is inserted between the node box and the pier body.

7. A support system for a full-width box girder according to claim 1, characterized in that, The load-bearing beam unit includes multiple load-bearing beams arranged laterally and multiple load-bearing beams arranged longitudinally, with the multiple load-bearing beams arranged laterally and the multiple load-bearing beams arranged longitudinally intersecting perpendicularly.

8. A support system for a full-width box girder according to claim 1, characterized in that, The distribution beam and template unit includes multiple sets of frames, the shapes of which are adapted to the outline shape of the box girder, and the multiple sets of frames are distributed at intervals along the length direction of the box girder.

9. A support system for a full-width box girder according to claim 1, characterized in that, The temporary consolidation unit includes support columns set on both sides of the pier body; the support columns are equipped with threaded steel bars, and the two ends of the support columns are respectively connected to the bottom plate of the box girder and the pier cap at the bottom of the pier body through the threaded steel bars; the support columns are filled with concrete.

10. A support system for a full-width box girder according to any one of claims 1-9, characterized in that, The top of the triangular truss bracket unit is provided with a drop block, which includes an upper wedge box and a lower wedge box. The ends of the upper wedge box and the lower wedge box facing each other are wedge surfaces. When the upper wedge box and the lower wedge box overlap, they form a rectangular structure. The upper wedge box and the lower wedge box can be fixed by fasteners to bear the upper load. When the fasteners are removed, the upper wedge box and the lower wedge box can slide relative to each other, thereby reducing the overall height of the drop block to form a removal gap.

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