Continuous beam integrated three-purpose support system of extradosed cable-stayed bridge

Abstract

According to the continuous beam integrated three-purpose support system of the extradosed cable-stayed bridge, steel pipe stand columns are arranged on the widened bearing platform foundations on the front side and the rear side of a pier body to serve as temporary consolidation supports, foundation treatment is reduced, the requirement for bearing capacity can be met, and in the temporary consolidation lengthening process, climbing cones and I-shaped steel are embedded in the pier body, so that the construction cost is reduced, and the construction efficiency is improved. The method comprises the following steps: forming a first-layer frame body for pier cap construction by a climbing cone and a temporary consolidation steel pipe upright post, lengthening the steel pipe upright post after pier cap construction is completed, laying I-shaped steel and a disc buckle bracket on the first-layer frame body to construct a second-layer bracket body of a 0 # block, firstly removing the 0 # block frame body after the 0 # block construction is completed, and then removing the frame body of the pier cap through a discharging block. And finally, only the steel pipe stand columns are reserved for temporary consolidation of hanging basket construction. The problems that according to a traditional method, construction of pier caps and 0 # blocks is difficult to complete through a conventional support system, and no temporary consolidation space exists are solved. Belongs to the field of extradosed cable-stayed bridge construction.

Description

TECHNICAL FIELD

[0001] The utility model relates to a low tower cable-stayed bridge continuous beam integrated three-purpose support system and belongs to the low tower cable-stayed bridge construction field. BACKGROUND

[0002] At present, with the development of urban construction, more bridge projects need to cross rivers, in order to meet the navigation requirements of rivers, the design requirements of bridge spans are high, in order to meet the design and use requirements, low tower cable-stayed bridges are more applied to engineering construction, the low tower cable-stayed bridge is a new type of bridge structure, which is a bridge structure between the prestressed concrete continuous structure bridge and the ordinary cable-stayed bridge, the beam size is small, the crossing capacity of the bridge is large, the limitation of the net space under the bridge and the bridge surface elevation is less, the wind resistance stability is better than that of the suspension bridge, it is more convenient for cantilever construction and has the advantages of convenient construction, material saving, large main beam stiffness and the like.

[0003] The conventional pier body shape is a pier body + arc pier cap, which can be directly constructed with a steel membrane, the conventional 0# block is located on land, or without such a special-shaped tray, a steel pipe support, a disc buckle support or a triangular bracket can be directly used as a frame body to make the 0# block.

[0004] The low tower cable-stayed bridge construction condition is mostly in water, the disc buckle support cannot be used, the site is limited, only the bearing platform construction area can set up the support, the pier body and the pier cap are at an angle, the pier body is small, it is difficult to set up the triangular bracket, the number of pieces is large, the pier body cannot bear, and after the pier cap is completed, the support cannot be continuously set up for the construction of the 0# block, based on such design and construction conditions, it is difficult to use the conventional support system to complete the construction of the pier cap and the 0# block (the pier cap is generally designed as an elliptical structure to meet the installation of the damper and the large support, part of the structure overhangs out of the pier body, the 0# block is flush with the center line of the pier cap, and the conventional underwater support method cannot simultaneously meet the cast-in-place construction of the pier cap and the 0# block); because the pier cap is a special-shaped structure, the space and the stress structure cannot meet the temporary consolidation anti-overturning safety requirements during the continuous beam cantilever construction, the distance between the pier cap and the beam body is too small, the conventional method of constructing the temporary concrete pillar on the pier cap to temporarily consolidate the continuous beam is difficult to implement, that is, there is no space for setting up the temporary consolidation; at the same time, the construction of the underwater pier cap and the 0# block and the temporary consolidation of the continuous beam all need to set up independent support systems, which not only increases the material cost, equipment investment and construction time, but also needs to set up and remove the support multiple times during the construction process, which greatly affects the construction efficiency and engineering progress, and also increases the construction safety risk and quality control difficulty.

[0005] Therefore, a low tower cable-stayed bridge continuous beam underwater temporary consolidation and support construction structure is designed, which can simultaneously meet the cast-in-place construction of the pier cap and the 0# block and the temporary consolidation of the continuous beam. SUMMARY

[0006] The utility model provides a low tower cable-stayed bridge continuous beam integrated three -purpose support system to solve the problem that the traditional method is difficult to adopt conventional support system to complete the construction of pier cap and 0 block, and there is no space for temporary consolidation.

[0007] To solve the above problems, a low tower cable-stayed bridge continuous beam integrated three -purpose support system structure is adopted, a row of steel pipe columns is constructed on the front and back sides of the pier body as temporary buttress, the steel pipe columns are connected and reinforced by diagonal bracing, the bottom pile cap is a widened two -level pile cap, the lower end of the steel pipe column is constructed and fixed on the two -level pile cap, the steel pipe column is provided with micro -expansion concrete, the pier body is fixed with a hanging leg by embedding a climbing cone at a set position, a rectangular notch is formed in the steel pipe column corresponding to the hanging leg, the main distribution beam penetrates the steel pipe column through the rectangular notch and is supported on the hanging leg at one end, three -spliced I -shaped steel and unloading block are installed on the main distribution beam above the hanging leg, double -spliced I -shaped steel in the transverse direction of the bridge is installed on the unloading block, longitudinal support I -shaped steel is distributed and laid on the double -spliced I -shaped steel, square wood is installed on the support I -shaped steel and bamboo plywood is laid, so as to form a pier cap support system;

[0008] 0 block support system: on the basis of the longitudinal support I -shaped steel frame, the bottom supporting main cross beam is distributed and laid in the transverse direction, the disc buckle frame is arranged in longitudinal and transverse directions, and is laid to the design elevation, I16 I -shaped steel is arranged on the top support, full -sized square wood and bamboo plywood are laid, and the 0 block support system construction is completed;

[0009] Box girder bottom plate temporary consolidation system: the 0 block bottom plate is provided with pier beam consolidation hole positions of steel pipe columns, steel bars are uniformly arranged on the inner and outer sides of the steel pipe column 1, the steel bars are anchored into the steel pipe on the top of the pier by not less than 50cm, and the anchoring length in the beam is not less than 100cm.

[0010] In the foregoing support system structure, the main distribution beam is Q345B material I45 I -shaped steel, the three -spliced I -shaped steel is three -spliced I16 I -shaped steel, the double -spliced I -shaped steel is double -spliced I45a I -shaped steel, and the support I -shaped steel is I32a I -shaped steel, and the bottom supporting main cross beam is I20 I -shaped steel laid in the transverse direction with a spacing of 60cm;

[0011] In the foregoing support system structure, the steel pipe columns are arranged on the front and back sides of the pier body and the two -level pile cap, the size and mileage of the two -level pile cap is increased by 0.8 1 13.6m strip foundation is integrated with the two -level pile cap, the steel bars are consistent with the two -level pile cap, two rows of steel pipe columns are arranged on the front and back sides, each row has 5 steel pipe columns, a total of 10 steel pipe columns, the center distance of the steel pipe columns is 4.6m from the center of the pier, the distance between the adjacent buttresses on the size and mileage sides is 9.2m, the steel pipe column adopts φ1000mm steel pipe, the wall thickness is 20mm, the height is 14-18m, and two sections are installed, and one section of concrete is poured after each installation section;

[0012] In the foregoing support system structure, the two-section steel pipe column adopts HRB400 grade Φ32 reinforcing steel welded inside and outside the steel pipe to form a U-shaped socket, the steel pipe is inserted into the socket and welded and fixed with the reinforcing steel;

[0013] In the foregoing support system structure, the top of the secondary bearing platform is embedded with a steel plate, the steel plate adopts 1200 1200 mm, a π-shaped steel is welded on each steel plate, the position and quantity of the π-shaped steel correspond to the steel pipe column 1 one by one, the π-shaped steel has a spacing of 10 cm, a total of 10, is invertedly buckled on the secondary bearing platform, two layers of Φ16 mm anti-cracking steel mesh are bound at the lower edge of the steel plate, the longitudinal and transverse spacing is 10 cm, and the layer spacing is 10 cm;

[0014] Compared with the prior art, the utility model discloses a temporary consolidation on the widened bearing platform, which can reduce the foundation treatment and meet the bearing capacity requirement. In the process of temporary consolidation lengthening, some climbing cones + I-shaped steel are embedded in the pier body to form the first layer frame of the pier cap construction by the climbing cones and the temporary consolidation steel pipe column. After the completion of the pier cap construction, the steel pipe column is lengthened, and the I-shaped steel + disc buckle support is laid on the first layer frame to make the second layer support frame of the 0# block. After the completion of the 0# block construction, the first layer frame is removed, and then the frame of the pier cap is removed by unloading the block. Finally, only the steel pipe column is reserved as the temporary consolidation for the hanging basket construction. The utility model can complete the support of the pier cap, the 0# block and the temporary consolidation by using one set of support system, which can reduce the construction time, improve the construction efficiency, reduce the erection and removal of the independent support system, reduce the material cost and equipment investment, save resources, reduce the artificial operation, reduce the safety risk of the construction personnel, reduce the labor demand and optimize the human resource allocation by using the support system. The construction technology level is improved, the construction quality is ensured and the stability of the structure is enhanced by researching and applying the key technology of the low tower cable-stayed bridge construction.

[0015] In conclusion, the structure and method can improve the construction efficiency and safety, reduce the cost, improve the engineering quality and have important significance for the smooth completion of the whole engineering project. ACCURACY

[0016] Figure 1 is the planar schematic view of the first stage as the pier cap construction frame;

[0017] Figure 2 is Figure 1 the structure schematic view of the 1-1 direction (front view) in the middle;

[0018] Figure 3 is Figure 1 is a structural schematic view in the direction of 2-2 in the middle;

[0019] Figure 4 is Figure 1 is a structural schematic view in the direction of 3-3 (side view) in the middle;

[0020] Figure 5 is a structural schematic view in the direction of 1-1 (front view) in the second stage as a 0# block construction frame body;

[0021] Figure 6 is a structural schematic view in the direction of 3-3 (side view) in the second stage as a 0# block construction frame body;

[0022] Figure 7 is a plan structural schematic view in the third stage as a hanging basket suspended pouring as a temporary consolidation frame body;

[0023] Figure 8 is a front structural schematic view in the third stage as a hanging basket suspended pouring as a temporary consolidation frame body;

[0024] Figure 9 is an end view of a steel pipe column and reinforcing steel bars;

[0025] Figure 10 is a structural schematic view of welding reinforcing steel bars of a lower section steel pipe column (without showing embedded connecting steel bars, etc.);

[0026] Figure 11 is a structural schematic view of connection between a lower end of a steel pipe column and a pile cap;

[0027] Figure 12 is a plan view of arrangement of shear steel bars of a bottom plate of a box girder of a steel pipe column;

[0028] Figure 13 is a front view of arrangement of shear steel bars of a bottom plate of a box girder of a steel pipe column;

[0029] Figure 14 is a plan view of arrangement of compression steel bars of a bottom plate of a box girder of a steel pipe column;

[0030] Figure 15 is a front view of arrangement of compression steel bars of a bottom plate of a box girder of a steel pipe column. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be further described in detail below in combination with the drawings, and it should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0032] EMBODIMENT

[0033] Taking a practical engineering project as an example, the drawings are referred toFigure 1 To the attached Figure 15 The embodiment is improved for the support system, and the improvement is to provide a low-tower cable-stayed bridge continuous beam integrated three-purpose support system. A row of steel pipe columns 1 is constructed on the front and rear sides of the pier body 2 as temporary support piers, the steel pipe columns 1 are connected and reinforced by diagonal braces 3, the bottom pile cap 4 is a widened two-stage pile cap, the lower end of the steel pipe column 1 is constructed and fixed on the two-stage pile cap, the steel pipe column 1 is provided with micro-expansion concrete, the pier body 2 is fixed with a hanging leg 6 by embedding a climbing cone 5 at a set position, a rectangular notch is formed in the steel pipe column 1 corresponding to the hanging leg 6, the main distribution beam 7 penetrates through the steel pipe column 1 through the rectangular notch and is supported on the hanging leg 6 at one end, the three-spliced I-shaped steel 8 and the unloading block 9 are installed on the main distribution beam 7 above the hanging leg 6, the control elevation, and the double-spliced I-shaped steel 10 in the transverse direction is installed on the unloading block 9, the longitudinal support I-shaped steel 11 is distributed, laid and installed on the double-spliced I-shaped steel 10, the square wood and the bamboo plywood 12 are installed on the support I-shaped steel 11 to form a pier cap support system, wherein the main distribution beam 7 is an I45 I-shaped steel made of Q345B material, the three-spliced I-shaped steel 8 is a three-spliced I16 I-shaped steel 8, the double-spliced I-shaped steel 10 is a double-spliced I45a I-shaped steel 10, and the support I-shaped steel 11 is an I32a I-shaped steel 11. The bottom supporting main cross beam 13 is an I20 I-shaped steel with a horizontal spacing of 60 cm, wherein the lower part of the two ends of the main distribution beam 7 is respectively constructed with a φ10 steel pipe 14, the upper end of the φ10 steel pipe 14 is installed with an unloading block 9, and the double-spliced I-shaped steel 10, the support I-shaped steel 11, the square wood and the bamboo plywood 12 in the transverse direction are installed on the unloading block 9.

[0034] 0# Block support system: On the basis of the longitudinal support I-shaped steel 11 frame, the bottom supporting main cross beam 13 is horizontally distributed and laid, the disc buckle frame body 16 is longitudinally and horizontally laid with a spacing, and is laid to the design elevation, and the I16 I-shaped steel + full-laid square wood + bamboo plywood is placed on the top support to complete the 0# block support system construction;

[0035] Temporary consolidation system of box girder bottom plate: The 0# block bottom plate is provided with a pier beam consolidation hole of a steel pipe column, and HRB400 grade Φ32 steel bars 15 are uniformly arranged on the inner and outer sides of the steel pipe column, and are anchored in the steel pipe on the top of the pier by not less than 50 cm, and the anchoring length in the beam is not less than 100 cm.

[0036] The specific implementation method is as follows:

[0037] (1) Pier cap construction

[0038] The temporary consolidation measure adopts the steel pipe column 1 beside the pier as the temporary support pier, the steel pipe column is arranged on the front and rear sides of the pier body 2 and the two-stage pile cap, and the size and mileage of the two-stage pile cap is increased by 0.8 1 13.6 m (wide high The strip foundation and the secondary support platform are integrally poured, the steel bars are consistent with the secondary support platform, two rows of steel bars are arranged in front and back, each row has 5 steel bars, and a total of 10 steel bars are arranged, the center distance between the support piers is 4.6 m from the pier center, the distance between the adjacent support piers on the large and small mileage sides is 9.2 m, the steel pipe column 1 is a steel pipe with a diameter of 1000 mm, a wall thickness of 20 mm, and a height of about 16 m, the inclined struts 3 between the steel pipe columns 1 are connected by 18a channel steels, and the transverse connection is achieved by two 18a channel steels. The steel pipe column and the pier body are connected by I45a H-shaped steel and the pier body embedded climbing cone in one way.

[0039] The top of the secondary support platform is embedded with a steel plate 18, the steel plate is made of 1200 1200 mm thick 20 mm thick steel plate 18, and a π-shaped steel bar 19 is welded on each steel plate 18, the position and number of the π-shaped steel bar 19 correspond to the steel pipe column 1, the π-shaped steel bar 19 has a spacing of 10 cm, a total of 10 steel bars, and is invertedly buckled on the secondary support platform. The lower edge of the steel plate 18 is bound with two layers of Φ16 mm anti-cracking steel mesh, the longitudinal and transverse spacing is 10 10 cm, and the layer spacing is 10 cm.

[0040] The steel pipe column 1 is installed in two sections (the first section is 9 m long, and the second section is about 7 m long), one section of concrete is poured for each installation, only the first section of the steel pipe column 1 (the lower section of the steel pipe column 1) is constructed before the construction of the pier cap, the first section and the second section are respectively hoisted, one section of concrete is poured for each installation, the remaining part of the steel pipe column 1 needs to reach more than 75% of the strength of the support platform concrete, the construction is carried out before the support and cofferdam water collection, then hoisted in place and welded, and the hoisting is carried out by using a 50t truck crane on the trestle.

[0041] HRB400 grade Φ32 reinforcing steel bars 17 are welded inside and outside the steel pipe between the two sections of the steel pipe to form a “U” shaped socket, the upper section of the steel pipe is inserted into the socket and welded and fixed with the steel bar. The specific method is that 4 groups of HRB400 grade Φ32 reinforcing steel bars 17 (2 reinforcing steel bars in each group, and the length of each reinforcing steel bar is 60 cm) are symmetrically welded on the inner and outer walls of the lower section of the steel pipe (the lower section of the steel pipe column 1) embedded in the support platform 4, and the length of the reinforcing steel bars extending into the hoisting joint part is 30 cm; the inner and outer walls of the upper section of the steel pipe of the hoisting joint part are also symmetrically welded with 4 groups, and the length of the reinforcing steel bars extending into the lower section of the steel pipe is 30 cm; the steel pipe of the hoisting joint part is clamped by 8 groups of reinforcing steel bars 17 to form a temporary stabilizing measure, at this time the hoist cable cannot be loosened and is still in a stressed state to increase the stability of the steel pipe. After the joint is good, the perpendicularity of the steel pipe is immediately checked, and after the perpendicularity meets the requirements, the part of the 8 groups of reinforcing steel bars 17 that are not welded with the steel pipe is immediately welded, and after the welding is completed, the hoist cable of the crane can be released, and the welding of the joint is carried out as soon as possible, the welding length is the circumference of the steel pipe, and the welding seam height is 20 mm.

[0042] The pre-embedded climbing cone 5 on the pier body 2 adopts M36 / D25 type climbing cone, six climbing cones 5 are pre-embedded at each hanging leg 6, the horizontal bridge spacing of the climbing cones 5 is 16+16 cm, the vertical spacing is 15 cm, the horizontal spacing of the hanging legs 6 is 317+312+288 cm, the hanging legs 6 are used as support points of the main horizontal beams of the pier cap support system, the rectangular cutout of the main distribution beam I45 H-shaped steel of the pier cap support system is reserved at the position corresponding to the steel pipe column 1 of the climbing cone 5, the I45 H-shaped steel of Q345B material is passed through the steel pipe column 1 and is arranged on the hanging leg 6 to complete the arrangement of the main load-bearing component of the support, and then three-spliced I16 H-shaped steel+unloading block+transverse double-spliced I45a H-shaped steel+longitudinal I32a H-shaped steel+transverse 10 10 square wood+17 mm bamboo plywood are used to make the cap beam cast-in-place platform.

[0043] When the pre-embedded climbing cone pier body position is reached, ① the formwork is assembled according to the drawing and the embedded part system is fixed on the formwork by bolts; ② after pouring, the bolts M36x75 are removed and the formwork is removed; ③ the hanging leg 6 is arranged in the climbing cone 5, ④ after the construction is completed, the force bolts, supports and climbing cones 5 are removed for reuse, and the climbing cone 5 is pre-embedded on the formwork, the level and verticality of the climbing cone 5 are ensured by precise measurement with a tape measure.

[0044] Unloading block 9 and distribution beam construction: after the hanging leg construction is completed, the I45a H-shaped steel is arranged as the main distribution beam 7 in the bridge direction, the I45a H-shaped steel is welded on the φ1000 20 mm steel pipe column 1 in the transverse position, the vertical reinforcement is welded on the steel pipe column 1 to strengthen the force bearing of the steel pipe column 1; ② the three-spliced H-shaped steel 8 (three-spliced I16 H-shaped steel) and the unloading block 9 are installed on the I45a H-shaped steel, the unloading block 9 is welded on the three-spliced H-shaped steel 8 at the bottom; ③ after the unloading block 9 is installed, the elevation is controlled, and the transverse double-spliced H-shaped steel 10 (double-spliced I45a H-shaped steel) is installed on it, which is welded on the unloading block 9; ④ the longitudinal support H-shaped steel 11 (I32a H-shaped steel) is installed, the spacing is 60 cm, and the double-spliced I32a H-shaped steel is used at the tower column position.

[0045] Pier cap construction: the 10 square wood with a spacing of 20 cm is installed on the support H-shaped steel 11 below the pier cap, the 1.7 cm bamboo plywood 12 is laid on the square wood, the reinforcement is bound, the side formwork of the pier cap adopts a steel formwork, the spacing of the pull rods is 60 cm, the φ20 precision rolled threaded steel is used to weld the tray reinforcement in a tensioning manner, and finally the concrete is poured, and a sky pump is used for pouring.

[0046] (2) 0# block support system construction

[0047] After the pouring of the pier cap is completed, the formwork is removed, and after curing is in place, I20 H-shaped steel is transversely erected on the support H-shaped steel 11 distribution beam frame foundation with a spacing of 60 cm, as the bottom support load-bearing main transverse beam of the 0# block disc buckle support frame, the disc buckle frame is erected with a longitudinal and transverse spacing of 60 cm 60 cm, and is erected to the design elevation, and I16 H-shaped steel + full paving of 10 10 cm square wood + 17 mm bamboo plywood is placed on the top support to complete the 0# block support system construction, and the 0# block formwork is assembled.

[0048] (3) The steel pipe column 1 in water is temporarily consolidated with the box girder bottom plate, the steel pipe column pier beam consolidation hole position is reserved on the 0# block bottom plate, 30 bundles of HRB400 grade Φ32 steel bars 15 are uniformly arranged along the inner and outer sides of the steel pipe column 1, are anchored into the steel pipe column 1 in the pier top by 80 cm, and the anchoring length in the beam is 130 cm, the end part of the beam is bent by 90° and is welded with the existing beam body steel bars, the reinforcing steel bars are arranged in the box girder bottom plate in the longitudinal and transverse directions to increase the HRB400 φ16 stirrups as shear steel bars 20, the spacing is 53 mm, and a total of 132 stirrups are arranged, the compression steel bar net 21 formed by the 4 layers of HRB400 φ16 steel bars arranged on the top of the steel pipe column is increased, the layer spacing is 10 cm, and the longitudinal and transverse spacing is 10 cm, so that the steel pipe column 1 is strengthened, and C55 micro-expansion concrete is poured into the steel pipe column 1, so that the steel pipe column in water and the beam body form a temporary consolidation system after the subsequent beam body concrete is poured, and the steel pipe column in water and the beam body form a temporary consolidation system after the subsequent beam body concrete is poured.

[0049] (4) According to the normal construction process, after the 0# block is pre-pressed, the 0# block steel bars are bound, the prestressed pipe is installed, and after inspection and qualification, the concrete is poured, in the concrete pouring process, the deformation of the support is observed, the concrete pouring sequence and speed are adjusted in time, and the construction safety and quality are ensured. After the concrete reaches the design strength, prestressed tension construction is carried out, the 0# block construction is completed, and the support system is sequentially removed in the order of first erection and then removal, except for the temporary consolidation of the steel pipe column in water.

[0050] (5) The cantilever pouring construction is carried out according to the design sequence, the support system and the temporary consolidation device are regularly checked and maintained, the closure section construction and system conversion are completed.

[0051] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A three-in-one support system for continuous beams of a low-tower cable-stayed bridge, wherein a row of steel pipe columns (1) is constructed on the front and rear sides of the pier (2) as temporary supports, and the steel pipe columns (1) are connected and reinforced by diagonal braces (3), characterized in that: The bottom bearing platform (4) is a widened two-stage bearing platform, the lower end of the steel pipe column (1) is fixed on the two-stage bearing platform during construction, the steel pipe column (1) is internally provided with micro-expansion concrete, the pier body (2) is fixed with a hanging leg (6) through a pre-buried climbing cone (5) at a set position, a rectangular cutout is formed on the steel pipe column (1) corresponding to the hanging leg (6), the main distribution beam (7) penetrates the steel pipe column (1) through the rectangular cutout and is arranged on the hanging leg (6) at one end, the three-spliced I-shaped steel (8) and the unloading block (9) are arranged on the main distribution beam (7) above the hanging leg (6), the double-spliced I-shaped steel (10) is arranged on the unloading block (9) in the transverse direction, the longitudinal support I-shaped steel (11) is arranged on the double-spliced I-shaped steel (10) in a distributed manner, the square wood and the bamboo plywood (12) are arranged on the support I-shaped steel (11) in a distributed manner, so as to form a pier cap support system.

2. The continuous beam integrated three-purpose support system for a low tower cable-stayed bridge according to claim 1, characterized in that: For the 0# block support system, the bottom supporting main cross beam (13) is arranged in a distributed manner in the transverse direction on the basis of the longitudinal support I-shaped steel (11) frame body, the disc buckle frame body is arranged in a distributed manner in the longitudinal and transverse directions and is arranged to the design elevation, and the I16 I-shaped steel + square wood + bamboo plywood is arranged on the top support.

3. The continuous beam integrated three-purpose support system for a low tower cable-stayed bridge according to claim 1, characterized in that: For the temporary consolidation system of the box girder bottom plate, the 0# block bottom plate is provided with pier beam consolidation hole positions of steel pipe columns, the steel bars (15) are arranged uniformly on the inner and outer sides of the steel pipe column (1), the steel bars are anchored into the steel pipe at the top of the pier by not less than 50 cm, and the anchoring length of the steel bars anchored into the beam is not less than 100 cm.

4. The continuous beam integrated three-purpose support system for a low tower cable-stayed bridge according to claim 2, characterized in that: The main distribution beam (7) is an I45 I-shaped steel made of Q345B material, the three-spliced I-shaped steel (8) is a three-spliced I16 I-shaped steel, the double-spliced I-shaped steel (10) is a double-spliced I45a I-shaped steel, the support I-shaped steel (11) is an I32a I-shaped steel, and the bottom supporting main cross beam (13) is an I20 I-shaped steel arranged in a transverse arrangement with a spacing of 60 cm.

5. The continuous beam integrated three-purpose support system for low-tower cable-stayed bridges according to claim 1, characterized in that: Steel pipe columns (1) are arranged on the two sides of the pier body (2) and the secondary bearing platform, and the size and mileage of the secondary bearing platform is increased by 0.8 1 13.6m strip foundation is poured integrally with the secondary bearing platform, and the steel bars are consistent with the secondary bearing platform. Two rows of steel pipe columns (1) are arranged in front of and behind the pier, with 5 steel pipe columns in each row, a total of 10 steel pipe columns. The center distance of the steel pipe columns (1) from the pier center is 4.6m, the distance between the adjacent supporting piers on the size and mileage sides is 9.2m, the steel pipe columns adopt φ1000mm steel pipes with a wall thickness of 20mm, a height of 14-18m, and are installed in two sections.

6. The continuous beam integrated three-purpose support system for a low tower cable-stayed bridge according to claim 5, characterized in that: The two-section steel pipe column (1) is provided with HRB400 grade Φ32 reinforcing steel bars (17) welded on the inner and outer sides of the steel pipe, so as to form a "U" type socket, the steel pipe is inserted into the socket and is welded and fixed with the reinforcing steel bars (17).

7. The continuous beam integrated three-purpose support system for a low tower cable-stayed bridge according to claim 1, characterized in that: The top of the secondary pile cap is embedded with steel plates, which are made of 1200 1200 20mm, each steel plate is welded with π-shaped steel bars, the position and number of which correspond to the steel pipe columns (1) one by one, the π-shaped steel bars are spaced 10cm apart, totally 10, which are invertedly buckled on the secondary pile cap, the lower edge of the steel plate is bound with two layers of Φ16mm anti-cracking steel mesh, which are spaced 10cm apart longitudinally and transversely 10cm, and the layer spacing is 10cm.

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