CN108978500B - Large-span box girder suspension casting assembly prestress composite support system and construction method - Google Patents

Large-span box girder suspension casting assembly prestress composite support system and construction method Download PDF

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Publication number
CN108978500B
CN108978500B CN201810661866.5A CN201810661866A CN108978500B CN 108978500 B CN108978500 B CN 108978500B CN 201810661866 A CN201810661866 A CN 201810661866A CN 108978500 B CN108978500 B CN 108978500B
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steel
plate
box girder
support
steel pipe
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CN108978500A (en
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于文银
王林
刘德利
魏建波
刘佳
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Dezhou Road Engineering Corp
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Dezhou Road Engineering Corp
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • E01D21/10Cantilevered erection
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type

Abstract

The invention relates to a large-span box girder suspension casting assembly prestress composite support system which comprises a bearing platform, a steel pipe column, a pier column, a multi-splicing steel girder, a section steel distribution beam, a unit type pre-splicing quick-connecting support, a box girder side template, a box girder, a platform steel plate steel pipe column bridging steel pipe column pre-embedded positioning support, a large-span box girder suspension casting composite support system, a large-span box girder suspension casting section counter-force prepressing system and a large-span box girder suspension casting section stereotyped support template system, wherein the steel pipe column is fixedly connected with the bearing platform; the lower part of the steel pipe column is connected with the bearing platform through a steel pipe column embedded positioning support; steel pipe column cross braces are arranged among the steel pipe columns; the upper part of the steel pipe column is provided with a multi-spliced section steel main beam, a section steel distribution beam and a platform steel plate; the upper part of the platform steel plate is provided with a unit type pre-assembled quick-connecting support, and the upper part of the unit type pre-assembled quick-connecting support is provided with a box girder side template. The invention has the beneficial effects that: the invention adopts the limit embedded frame plate for guiding installation, effectively improves the installation speed of the steel pipe column, improves the installation precision of the steel pipe column and is convenient for construction.

Description

Large-span box girder suspension casting assembly prestress composite support system and construction method
Technical Field
The invention relates to a large-span box girder suspension casting assembly prestress composite bracket system and a construction method, belongs to the field of civil engineering, and is suitable for construction of the large-span box girder suspension casting assembly prestress composite bracket system.
Background
With the rapid development of social economy, bridge engineering becomes the key point of attention of people, and at the present stage, the role expression of highway bridges in the social economy development of China is more and more prominent, and the requirements of people on the aspects of style, structure, aesthetic degree and the like of continuous bridges are continuously improved. With the development of scientific technology in China, the construction technology of continuous box girder construction is also changing day by day. The construction structure of the large-span concrete continuous box girder is widely applied.
In the construction of the cast-in-place box girder of the bridge, the bracket is an important component for bearing the self weight and the construction load of the girder body. The rationality of the support selection is related to the safety and stability of the beam cast-in-place and the quality of the beam. For cast-in-place prestressed concrete box girders with steep terrain and higher pier bodies. The construction of the support is adopted, so that the foundation treatment difficulty is higher, and the safety is reduced. And the material personnel input is also large. The problems of difficult installation and positioning of the steel pipe column, poor stability of the support, poor prepressing effect of the support, complex moving process of the template support and the like easily occur in the construction process of the large-span box girder suspension casting assembly prestress composite support system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a large-span box girder suspension casting assembly prestress composite bracket system and a construction method.
The large-span box girder suspension-casting assembly prestress composite support system comprises a bearing platform, a steel pipe column, a pier column, a multi-spliced steel girder, a section steel distribution beam, a unit type pre-spliced quick-connection support, a box girder side template, a box girder, a platform steel plate steel pipe column bridging steel pipe column pre-embedded positioning support, a large-span box girder suspension-casting composite support system, a large-span box girder suspension-casting section counter-force prepressing system and a large-span box girder suspension-casting section shaping support system;
the lower part of the steel pipe column is connected with the bearing platform through a steel pipe column embedded positioning support; steel pipe column cross braces are arranged among the steel pipe columns; the upper part of the steel pipe column is provided with a multi-spliced section steel main beam, a section steel distribution beam and a platform steel plate; the upper part of the platform steel plate is provided with a unit type pre-assembly quick-connection bracket, the upper part of the unit type pre-assembly quick-connection bracket is provided with a box girder side template, and the upper part of the box girder side template is provided with a box girder;
the large-span box girder cantilever casting composite bracket system comprises a steel pipe column top connecting notch, a column top built-in shelving ring plate, a short shelf, a profile steel T-shaped rib plate, a distribution beam connecting piece, a profile steel integral counter-pulling screw group, a profile steel cantilever support, an inter-column integral sash connecting plate and a column bottom integral sash connecting plate;
the large-span box girder suspension pouring section counter-force prepressing system comprises anchor cable bottom anchoring section steel, an anchor cable dynamometer, a counter-force prepressing anchor cable, an integral prepressing support, section steel string rods, string rod cushion blocks, a synchronous prepressing jack, a counter-force support frame, a bearing platform top fixed type steel frame, a bearing platform outer wrapping lattice plate, a lattice plate inner extending bottom end and an anchoring section steel embedded part;
the large-span box girder suspension casting section regularization formwork system comprises a splicing truss type safety protection plate, a bottom die slide rail, a box girder bottom die, a bottom die falling frame, an inclined jack, a side die slide rail, a support top fixing inclined plate, an inclined base plate, an inclined support, a support butt joint steel plate, an adjustable elevation base and a support connecting bolt.
Preferably, the method comprises the following steps: the steel pipe column pre-embedded positioning support comprises an integral threaded rib support, a bearing platform main rib, a leveling sealing layer, a column bottom sealing steel plate, a cross-shaped positioning groove, a limiting embedded frame plate, a tooth-shaped guard plate, a column bottom expanding bearing plate, a micro-embedded pre-embedded bottom plate, a rib plate hanging rib, a frame grid type rib plate with holes and an anchoring steel bar; the lower part of the steel pipe column embedded positioning support is connected with a bearing platform through anchoring steel bars, and the anchoring steel bars are fixed through an integral type thread rib support; the upper part of the anchoring steel bar is provided with a frame grid type ribbed plate with holes, and the frame grid type ribbed plate with holes is provided with a ribbed plate hanging bar connected with a bearing platform main bar; the upper part of the anchoring steel bar is welded with the micro-embedded bottom plate; the upper part of the micro-embedded bottom plate is provided with a cross positioning key; the lower part of the steel pipe column is welded with a column bottom sealing steel plate which is provided with a cross positioning groove and a limiting embedded frame plate; the lower part of the column bottom closed steel plate is provided with a column bottom enlarged bearing plate; the column bottom expanding bearing plate is provided with a tooth-shaped guard plate which is fixed with the steel pipe column; and a leveling sealing layer is arranged on the upper surface of the steel pipe column embedded positioning support for surface sealing.
Preferably, the method comprises the following steps: the lower part of the large-span box girder suspension casting composite bracket system is connected with a bearing platform through a steel pipe column embedded positioning support; the upper part of the steel pipe column is provided with a steel pipe column top connecting notch, a column top built-in placing ring plate, a short shelf, a profile steel T-shaped rib plate and a multi-spliced profile steel main beam; profile steel integral counter-pulling screw groups are arranged among the multi-spliced profile steel main beams and are fixed; the upper part of the multi-spliced section steel main beam is provided with a distribution beam connecting piece connected with the section steel distribution beam; a platform steel plate is arranged at the upper part of the profile steel distribution beam; the steel cantilever supports are arranged on two sides of the steel pipe column to fix the multi-spliced steel girder; and an integral lattice connecting plate between columns and an integral lattice connecting plate at the bottom of the column are arranged between the steel pipe columns for fixing.
Preferably, the method comprises the following steps: the lower part of the counter-force prepressing system of the large-span box girder suspension casting section is connected with the bearing platform through an anchoring type steel embedded part; the upper part of the anchoring type steel embedded part is connected with a bearing platform top fixed type steel frame; the outer part of the bearing platform is provided with a bearing platform outer wrapping lattice plate, and the inward extending bottom end of the lattice plate is connected with a bearing platform top fixed type steel frame; a counterforce support frame is arranged on the steel pipe column to provide counterforce for the bearing platform top fixed type steel frame; the upper part of the large-span box girder suspension casting section counter-force prepressing system is provided with an integral prepressing bracket; the upper part of the bearing platform top fixed type steel frame is provided with an anchor cable bottom anchoring type steel fixed counter-force prepressing anchor cable bottom, and the counter-force prepressing anchor cable is provided with an anchor cable dynamometer; a synchronous prepressing jack and an anchor cable dynamometer are arranged on the integral prepressing support and the bearing platform top fixed type steel frame for prepressing the support; the integral prepressing support is provided with a section steel string rod and a string rod cushion block which are connected into a whole.
Preferably, the method comprises the following steps: the lower part of the large-span box girder suspension casting section sizing formwork system is provided with a multi-spliced section steel main girder, a section steel distribution girder and a platform steel plate; the upper part of the platform steel plate is provided with a unit type pre-spliced quick connecting bracket; the upper part of the unit type pre-splicing quick-connecting support is provided with a support top fixed inclined plate, an inclined base plate, an inclined support and an inclined jack for adjusting the position of a box girder side template; one side of the unit type pre-splicing quick-connecting support is provided with a splicing truss type safety protection plate; the bottom of the box girder is provided with a box girder bottom die which moves through a bottom die slide rail and a bottom die falling frame; the box girder side template moves through the elevation-adjustable base and the side template slide rail; the unit type pre-assembled quick-connecting support is connected through a support butt-joint steel plate and a support connecting bolt.
The construction method for the large-span box girder suspension casting assembly prestress composite bracket system comprises the following steps:
step one, steel pipe column installation: the steel pipe columns are connected with the bearing platform through steel pipe column embedded positioning supports, and steel pipe column cross braces are arranged among the steel pipe columns for fixing;
step two, mounting a section steel platform: the upper part of the steel pipe column is provided with a multi-spliced steel girder, the upper part of the multi-spliced steel girder is provided with a distribution beam connecting piece connected with a section steel distribution beam, and a platform steel plate is laid on the upper part of the section steel distribution beam;
step three, support prepressing: the integral prepressing support and the bearing platform top fixed type steel frame are prepressed by a synchronous prepressing jack and an anchor cable dynamometer;
step four, template installation: the unit type pre-assembly quick-connection support is erected on the upper portion of the profile steel platform, the upper portion of the unit type pre-assembly quick-connection support is connected with the box girder template, the box girder bottom die is moved through the bottom die slide rail and the bottom die falling frame after construction of a section of box girder is completed, and the box girder side template is moved through the adjustable elevation base and the side die slide rail.
The invention has the beneficial effects that:
(1) the invention adopts the limit embedded frame plate for guiding installation, effectively improves the installation speed of the steel pipe column, improves the installation precision of the steel pipe column and is convenient for construction.
(2) The anchor cable dynamometer, the counter-force prepressing anchor cable and the synchronous prepressing jack are adopted to control the prepressing pressure, so that the prepressing pressure control precision is effectively improved, and the prepressing effect is ensured.
(3) The bottom die slide rail and the side die slide rail are arranged to move the box girder side die plate and the box girder bottom die, so that the mounting speed of the die plate is effectively increased, and the construction is convenient.
Drawings
FIG. 1 is a structural diagram of a large-span box girder suspension casting assembly prestress composite bracket system;
FIG. 2 is a structural diagram of a steel pipe column embedded positioning support;
FIG. 3 is a structural diagram of a large-span box girder suspension casting composite bracket system;
FIG. 4 is a structural diagram of a reaction force pre-pressing system of a suspended casting section of a large-span box girder;
FIG. 5 is a structural diagram of a large-span box girder suspension casting section sizing formwork system;
fig. 6 is a diagram of a unit type pre-splicing quick-connecting bracket.
Description of reference numerals: 1. a bearing platform; 2. steel pipe columns; 3. pier studs; 4. a multi-spliced steel girder; 5. a profile steel distribution beam; 6. a unit type pre-splicing quick-connecting bracket; 7. a box girder side form; 8. splicing truss type safety protection plates; 9. a bottom die slide rail; 10. a box girder; 11. a box girder bottom die; 12. a bottom die falling frame; 13. a diagonal jack; 14. a side form slide rail; 15. a platform steel plate; 16. supporting the section steel in a cantilever manner; 17. integral sash connecting plates among the columns; 18. steel pipe column bridging; 19. the column bottom is an integral sash connecting plate; 20. embedding a positioning support in the steel pipe column; 21. an integral threaded rib bracket; 22. main ribs of the bearing platform; 23. leveling the sealing layer; 24. a ribbed plate with an arc support; 25. a column bottom closed steel plate; 26. a cross positioning slot; 27. a cross positioning key; 28. limiting and embedding the frame plate; 29. a toothed guard plate; 30. a bolt; 31. enlarging the bearing plate at the bottom of the column; 32. micro-embedded pre-embedded bottom plates; 33. hanging ribs by using the rib plates; 34. frame lattice type rib plates with holes; 35. anchoring the reinforcing steel bars; 36. a section steel T-shaped rib plate; 37. the top of the steel pipe column is connected with the notch; 38. a support; 39. a placing ring plate is arranged in the top of the column; 40. a short shelf; 41. a distribution beam connection; 42. the profile steel integral counter-pulling screw group; 43. anchoring section steel at the bottom of the anchor cable; 44. an anchor cable dynamometer; 45. prepressing the anchor cable in a counter-force manner; 46. integrally pre-pressing the bracket; 47. a section steel string rod; 48. a stringing pole cushion block; 49. synchronously pre-pressing the jack; 50. a jack holding cavity; 51. reinforcing the connecting support; 52. a counter-force support frame; 53. a bearing platform top fixed type steel frame; 54. the bearing platform is externally wrapped with a lattice plate; 55. the bottom end of the frame plate extends inwards; 56. anchoring the steel embedded part; 57. the top of the bracket is fixed with an inclined plate; 58. an oblique base plate; 59. an oblique bracket; 60. hinged side forms with brackets; 61. the bracket is butted with the steel plate; 62. a scissor support; 63. erecting a support; 64. a support rail; 65. an elevation-adjustable base; 66. the support is connected with a bolt.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The large-span box girder suspension casting assembly prestress composite support system comprises a bearing platform 1, a steel pipe column 2, a pier column 3, a multi-spliced steel main beam 4, a steel distribution beam 5, a unit type pre-spliced quick-connecting support 6, box girder side templates 7, a box girder 10, a platform steel plate 15, steel pipe column cross braces 18, a steel pipe column pre-embedded positioning support 20, a large-span box girder suspension casting composite support system, a large-span box girder suspension casting section counter-force pre-pressing system and a large-span box girder suspension casting section shaping support system;
the lower part of the steel pipe column 2 is connected with the bearing platform 1 through a steel pipe column embedded positioning support 20; steel pipe column cross braces 18 are arranged among the steel pipe columns 2; the upper part of the steel pipe column 2 is provided with a multi-spliced section steel main beam 4, a section steel distribution beam 5 and a platform steel plate 15; the upper part of the platform steel plate 15 is provided with a unit type pre-assembly quick-connection support 6, the upper part of the unit type pre-assembly quick-connection support 6 is provided with a box girder side template 7, and the upper part of the box girder side template 7 is provided with a box girder 10;
the large-span box girder suspension casting composite bracket system comprises a steel pipe column top connecting notch 37, a column top built-in resting ring plate 39, a short shelf 40, a section steel T-shaped rib plate 36, a distribution beam connecting piece 41, a section steel integral counter-pulling screw group 42, a section steel cantilever support 16, an inter-column integral sash connecting plate 17 and a column bottom integral sash connecting plate 19;
the large-span box girder suspension pouring section counter-force pre-pressing system comprises anchor cable bottom anchoring section steel 43, an anchor cable dynamometer 44, a counter-force pre-pressing anchor cable 45, an integral pre-pressing support 46, a section steel string rod 47, a string rod cushion block 48, a synchronous pre-pressing jack 49, a counter-force support frame 52, a bearing platform top fixed type steel frame 53, a bearing platform outer wrapping frame plate 54, a frame plate inner extending bottom end 55 and an anchoring section steel embedded part 56;
the large-span box girder suspension casting section regularization formwork system includes grafting truss-like safety protection plate 8, die block slide rail 9, box girder die block 11, die block position frame 12, slant jack 13, side form slide rail 14, the fixed swash plate 57 in support top, slant backing plate 58, slant support 59, support butt joint steel sheet 61, adjustable elevation base 65, leg joint bolt 66.
The steel pipe column pre-embedded positioning support 20 comprises an integral threaded rib support 21, a cushion cap main rib 22, a leveling sealing layer 23, a column bottom sealing steel plate 25, a cross positioning groove 26, a limiting embedded frame plate 28, a tooth-shaped guard plate 29, a column bottom expanding bearing plate 31, a micro-embedded type pre-embedded bottom plate 32, a rib plate hanging rib 33, a frame grid type perforated rib plate 34 and an anchoring steel bar 35; the lower part of the steel pipe column embedded positioning support 20 is connected with the bearing platform 1 through anchoring steel bars 35, and the anchoring steel bars 35 are fixed through an integral type thread rib support 21; the upper part of the anchoring steel bar 35 is provided with a lattice type perforated rib plate 34, and the lattice type perforated rib plate 34 is provided with a rib plate hanging rib 33 connected with the bearing platform main rib 22; the upper part of the anchoring steel bar 35 is welded with the micro-embedded type embedded bottom plate 32; the upper part of the micro-embedded type embedded bottom plate 32 is provided with a cross positioning key 27; the lower part of the steel pipe column 2 is welded with a column bottom closed steel plate 25, and the column bottom closed steel plate 25 is provided with a cross positioning groove 26 and a limiting embedded frame plate 28; the lower part of the column bottom closed steel plate 25 is provided with a column bottom enlarged bearing plate 31; the column bottom expanding bearing plate 31 is provided with a tooth-shaped guard plate 29 which is fixed with the steel pipe column 2; and a leveling sealing layer 23 is arranged on the upper surface of the steel pipe column embedded positioning support 20 for surface sealing.
The lower part of the large-span box girder suspension casting composite bracket system is connected with the bearing platform 1 through the steel pipe column embedded positioning support 20; the upper part of the steel pipe column 2 is provided with a steel pipe column top connecting notch 37, a column top built-in laying ring plate 39, a short shelf 40, a section steel T-shaped rib plate 36 and a multi-spliced section steel main beam 4 for connection; profile steel integral split screw groups 42 are arranged among the multi-spliced profile steel main beams 4 for fixing; the upper part of the multi-spliced steel main beam 4 is provided with a distribution beam connecting piece 41 connected with the steel distribution beam 5; a platform steel plate 15 is arranged on the upper part of the section steel distribution beam 5; the steel cantilever supports 16 are arranged on two sides of the steel pipe column 2 to fix the multi-spliced steel girder 4; and an integral lattice connecting plate 17 between columns and an integral lattice connecting plate 19 at the bottom of the column are arranged between the steel pipe columns 2 for fixing.
The lower part of the counter-force prepressing system of the suspended casting section of the large-span box girder is connected with the bearing platform 1 through an anchoring type steel embedded part 56; the upper part of the anchoring type steel embedded part 56 is connected with a bearing platform top fixed type steel frame 53; the outer part of the bearing platform 1 is provided with a bearing platform outer wrapping lattice plate 54, and the inward extending bottom end 55 of the lattice plate is connected with a bearing platform top fixed type steel frame 53; the steel pipe column 2 is provided with a counter-force support frame 52 for providing counter-force for a bearing platform top fixed type steel frame 53; the upper part of the counter-force prepressing system of the suspension casting section of the large-span box girder is provided with an integral prepressing bracket 46; the upper part of the bearing platform top fixed type steel frame 53 is provided with an anchor rope bottom anchoring type steel 43 for fixing the bottom of the counter-force prepressing anchor rope 45, and the counter-force prepressing anchor rope 45 is provided with an anchor rope dynamometer 44; the integral pre-pressing bracket 46 and the bearing platform top fixed type steel frame 53 are provided with a synchronous pre-pressing jack 49 and an anchor cable dynamometer 44 for bracket pre-pressing; the integral pre-pressing bracket 46 is provided with a section steel string rod 47 and a string rod cushion block 48 which are connected into a whole.
The lower part of the large-span box girder suspension casting section sizing formwork system is provided with a multi-spliced steel girder 4, a steel distribution girder 5 and a platform steel plate 15; the upper part of the platform steel plate 15 is provided with a unit type pre-assembly quick-connection bracket 6; the upper part of the unit type pre-assembled quick-connecting support 6 is provided with a support top fixed inclined plate 57, an inclined base plate 58, an inclined support 59 and an inclined jack 13 for adjusting the position of the box girder side template 7; one side of the unit type pre-splicing quick-connecting support 6 is provided with a splicing truss type safety protection plate 8; the bottom of the box girder 10 is provided with a box girder bottom die 11, and the box girder bottom die 11 moves through a bottom die slide rail 9 and a bottom die falling frame 12; the box girder side template 7 moves through the elevation-adjustable base 65 and the side template slide rail 14; the unit type pre-assembled quick-connecting bracket 6 is connected through a bracket butt-joint steel plate 61 and a bracket connecting bolt 66.
The construction method for assembling the prestress composite bracket system by the large-span box girder suspension casting comprises the following steps:
step one, steel pipe column installation: the steel pipe columns 2 are connected with the bearing platform 1 through steel pipe column embedded positioning supports 20, and steel pipe column cross braces 18 are arranged among the steel pipe columns 2 for fixing;
step two, mounting a section steel platform: the upper part of the steel pipe column 2 is provided with a multi-spliced steel girder 4, the upper part of the multi-spliced steel girder 4 is provided with a distribution beam connecting piece 41 connected with a steel distribution beam 5, and the upper part of the steel distribution beam 5 is paved with a platform steel plate 15;
step three, support prepressing: the integral pre-pressing support 46 and the bearing platform top fixed type steel frame 53 are pre-pressed through a synchronous pre-pressing jack 49 and an anchor cable dynamometer 44;
step four, template installation: the unit type pre-assembly fast-connection support 6 is erected on the upper portion of the profile steel platform, the upper portion of the unit type pre-assembly fast-connection support 6 is connected with a box girder 10 template, a box girder bottom die 11 is moved through a bottom die slide rail 9 and a bottom die locating frame 12 after construction of a section of box girder 10 is completed, and a box girder side template 7 is moved through an adjustable elevation base 65 and a side template slide rail 14.

Claims (6)

1. A large-span box girder suspension casting assembly prestress composite support system is characterized by comprising a bearing platform (1), a steel pipe column (2), a pier column (3), a multi-spliced steel girder (4), a steel distribution beam (5), a unit type pre-spliced quick connection support (6), a box girder side template (7), a box girder (10), a platform steel plate (15), a steel pipe column cross brace (18), a steel pipe column pre-embedded positioning support (20), a large-span box girder suspension casting composite support system, a large-span box girder suspension casting section counter-force pre-pressing system and a large-span box girder suspension casting section shaping formwork system;
the lower part of the steel pipe column (2) is connected with the bearing platform (1) through a steel pipe column embedded positioning support (20); steel pipe column cross braces (18) are arranged between the steel pipe columns (2); the upper part of the steel pipe column (2) is provided with a multi-spliced section steel main beam (4), a section steel distribution beam (5) and a platform steel plate (15); the upper part of the platform steel plate (15) is provided with a unit type pre-assembly quick-connection support (6), the upper part of the unit type pre-assembly quick-connection support (6) is provided with a box girder side template (7), and the upper part of the box girder side template (7) is provided with a box girder (10);
the large-span box girder suspension casting composite support system comprises a steel pipe column top connecting notch (37), a column top built-in laying ring plate (39), a short shelf (40), a section steel T-shaped rib plate (36), a distribution beam connecting piece (41), a section steel integral counter-pulling screw group (42), a section steel cantilever support (16), an inter-column integral sash connecting plate (17) and a column bottom integral sash connecting plate (19);
the large-span box girder suspension pouring section counter-force pre-pressing system comprises anchor cable bottom anchoring section steel (43), an anchor cable dynamometer (44), a counter-force pre-pressing anchor cable (45), an integral pre-pressing support (46), a section steel string rod (47), a string rod cushion block (48), a synchronous pre-pressing jack (49), a counter-force support frame (52), a bearing platform top fixed type steel frame (53), a bearing platform outer wrapping frame grid plate (54), a grid plate inner extending bottom end (55) and an anchoring section steel embedded part (56);
the large-span box girder suspension casting section regularization formwork system comprises a splicing truss type safety protection plate (8), a bottom die sliding rail (9), a box girder bottom die (11), a bottom die falling frame (12), an inclined jack (13), a side die sliding rail (14), a support top fixing inclined plate (57), an inclined base plate (58), an inclined support (59), a support butt joint steel plate (61), an adjustable elevation base (65) and a support connecting bolt (66).
2. The large-span box girder suspension casting assembly prestress composite bracket system according to claim 1, wherein the steel pipe column embedded positioning support (20) comprises an integral threaded rib bracket (21), a bearing platform main rib (22), a leveling sealing layer (23), a column bottom sealing steel plate (25), a cross positioning slot (26), a limiting embedded frame plate (28), a tooth-shaped guard plate (29), a column bottom expanding bearing plate (31), a micro embedded bottom plate (32), a rib plate hanging rib (33), a frame grid type perforated rib plate (34) and an anchoring steel bar (35); the lower part of the steel pipe column embedded positioning support (20) is connected with the bearing platform (1) through anchoring steel bars (35), and the anchoring steel bars (35) are fixed through an integral type thread rib support (21); the upper part of the anchoring steel bar (35) is provided with a lattice type perforated rib plate (34), and the lattice type perforated rib plate (34) is provided with a rib plate hanging bar (33) connected with the bearing platform main bar (22); the upper part of the anchoring steel bar (35) is welded with the micro-embedded type embedded bottom plate (32); the upper part of the micro-embedded type embedded bottom plate (32) is provided with a cross positioning key (27); a column bottom sealing steel plate (25) is welded at the lower part of the steel tube column (2), and the column bottom sealing steel plate (25) is provided with a cross positioning groove (26) and a limiting embedded frame plate (28); the lower part of the column bottom closed steel plate (25) is provided with a column bottom expanding bearing plate (31); the column bottom expanding bearing plate (31) is provided with a tooth-shaped guard plate (29) and fixed with the steel pipe column (2); and a leveling sealing layer (23) is arranged on the upper surface of the steel pipe column embedded positioning support (20) for surface sealing.
3. The large-span box girder cantilever-casting assembly prestress composite bracket system according to claim 1, characterized in that the lower part of the large-span box girder cantilever-casting composite bracket system is connected with a bearing platform (1) through a steel pipe column pre-embedded positioning support (20); the upper part of the steel pipe column (2) is provided with a steel pipe column top connecting notch (37), a column top built-in shelving ring plate (39), a short shelf (40) and a section steel T-shaped rib plate (36) which are connected with a multi-spliced section steel main beam (4); profile steel integral counter-pulling screw groups (42) are arranged among the multi-spliced profile steel main beams (4) for fixing; the upper part of the multi-spliced section steel main beam (4) is provided with a distribution beam connecting piece (41) connected with the section steel distribution beam (5); a platform steel plate (15) is arranged at the upper part of the section steel distribution beam (5); profile steel cantilever supports (16) are arranged on two sides of the steel pipe column (2) to fix the multi-spliced profile steel main beam (4); an integral lattice connecting plate (17) between columns and an integral lattice connecting plate (19) at the bottom of the column are arranged between the steel pipe columns (2) for fixing.
4. The large-span box girder suspension casting assembly prestress composite bracket system according to claim 1, characterized in that the lower part of the large-span box girder suspension casting section reaction force preloading system is connected with a bearing platform (1) through an anchoring type steel embedded part (56); the upper part of the anchoring type steel embedded part (56) is connected with a bearing platform top fixed type steel frame (53); a bearing platform outer wrapping lattice plate (54) is arranged outside the bearing platform (1), and the inward extending bottom end (55) of the lattice plate is connected with a bearing platform top fixed type steel frame (53); a counterforce support frame (52) is arranged on the steel pipe column (2) to provide counterforce for a bearing platform top fixed type steel frame (53); the upper part of the counter-force preloading system of the suspension casting section of the large-span box girder is provided with an integral preloading bracket (46); the upper part of a bearing platform top fixed type steel frame (53) is provided with anchor cable bottom anchoring steel (43) for fixing the bottom of a counter-force prepressing anchor cable (45), and the counter-force prepressing anchor cable (45) is provided with an anchor cable dynamometer (44); a synchronous pre-pressing jack (49) and an anchor cable dynamometer (44) are arranged on the integral pre-pressing support (46) and a bearing platform top fixed type steel frame (53) for support pre-pressing; the integral pre-pressing bracket (46) is provided with a section steel string rod (47) and a string rod cushion block (48) which are connected into a whole.
5. The long-span box girder suspension casting assembly prestress composite bracket system according to claim 1, wherein a multi-spliced steel main girder (4), a steel distribution girder (5) and a platform steel plate (15) are arranged at the lower part of a large-span box girder suspension casting section sizing formwork system; the upper part of the platform steel plate (15) is provided with a unit type pre-splicing quick connecting bracket (6); the upper part of the unit type pre-assembled quick-connecting bracket (6) is provided with a bracket top fixed inclined plate (57), an inclined base plate (58), an inclined bracket (59) and an inclined jack (13) for adjusting the position of the box girder side template (7); one side of the unit type pre-spliced quick-connection support (6) is provided with a splicing truss type safety protection plate (8); the bottom of the box girder (10) is provided with a box girder bottom die (11), and the box girder bottom die (11) moves through a bottom die slide rail (9) and a bottom die falling frame (12); the box girder side template (7) moves through the elevation-adjustable base (65) and the side template slide rail (14); the unit type pre-assembled quick-connecting support (6) is connected through a support butt-joint steel plate (61) and a support connecting bolt (66).
6. The construction method for the large-span box girder suspension casting assembly prestress composite bracket system according to claim 1 is characterized by comprising the following steps:
step one, steel pipe column installation: the steel pipe columns (2) are connected with the bearing platform (1) through steel pipe column embedded positioning supports (20), and steel pipe column cross braces (18) are arranged among the steel pipe columns (2) for fixing;
step two, mounting a section steel platform: the upper part of the steel pipe column (2) is provided with a multi-spliced steel girder (4), the upper part of the multi-spliced steel girder (4) is provided with a distribution beam connecting piece (41) connected with a steel distribution beam (5), and the upper part of the steel distribution beam (5) is paved with a platform steel plate (15);
step three, support prepressing: the integral pre-pressing support (46) and a bearing platform top fixed type steel frame (53) are pre-pressed through a synchronous pre-pressing jack (49) and an anchor cable dynamometer (44);
step four, template installation: a unit type pre-assembly fast-connection support (6) is erected on the upper portion of a profile steel platform, the upper portion of the unit type pre-assembly fast-connection support (6) is connected with a box girder (10) template, a box girder bottom die (11) is moved through a bottom die sliding rail (9) and a bottom die locating frame (12) after construction of a section of box girder (10) is completed, and a box girder side template (7) is moved through an adjustable elevation base (65) and a side die sliding rail (14).
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CN102979038A (en) * 2012-12-12 2013-03-20 广东省长大公路工程有限公司 Cast-in-place box beam mobile bracket with increased width
CN104652288A (en) * 2015-03-06 2015-05-27 中铁十六局集团第二工程有限公司 Construction system of cast-in-situ large-tonnage box girder for soft soil foundation and construction method
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