Composite support structure for construction of straining beams, skewbacks and end cross beams

Abstract

The utility model discloses a composite support structure for construction of straining beams, skewbacks and end cross beams, which comprises a steel plate platform, a plurality of steel square strips are uniformly distributed and welded at the bottom of the steel plate platform along the length direction, a plurality of I-shaped steels are uniformly distributed and welded at the bottoms of the steel square strips, and the steel square strips at corresponding positions are respectively connected in series by the I-shaped steels. The two ends of the bottoms of the I-beams are respectively welded with a piece of double-spliced I-beam, the two ends of the I-beams are respectively connected in series by the two pieces of double-spliced I-beam, the bottoms of the two pieces of double-spliced I-beam are respectively and symmetrically welded with four upright posts capable of being lengthened, and a diagonal bridging and a cross brace are connected between every two adjacent upright posts. The composite support structure for the construction of the straining beam, the skewback and the end cross beam can be used for the construction of the straining beam, the skewback and the end cross beam, effectively avoids the repeated assembly and disassembly of the support and the use of a large amount of steel, reduces the erection time of the support, and has the advantages of simple structure, convenience in construction, good stability and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of construction of tied arch bridges with steel-concrete composite under-braced structures, specifically a composite support structure for the construction of tie beams, arch seats, and end crossbeams. Background Technology

[0002] The tied-arch bridge with steel-concrete composite under-deck is widely used in the construction of large and medium-span bridges due to its beautiful shape, statically determinate structure, lightweight construction, and low cost. In recent years, in particular, with the construction of inland waterways in southern regions and the urgent need for upgrading and reconstruction projects, this type of bridge has been extensively built in the construction of new waterway bridges.

[0003] Currently, in the structure of a tied arch bridge with steel-concrete composite pipe, after the pile foundation is constructed, the pier construction is divided into four sections. The fourth section is constructed together with the tie beam. During construction, a scaffold is erected at the bottom of the tie beam, with the scaffold platform width greater than the tie beam width to facilitate construction. Since the arch abutments are filled with C55 self-compacting shrinkage-compensating concrete, and the abutments are connected by end steel crossbeams, the end crossbeams and arch abutments need to be constructed simultaneously. Therefore, a scaffold platform is also required, with a platform area larger than the bottom area of ​​the arch abutments and end crossbeams, to facilitate welding of the end crossbeam section to the inner contact surface of the arch abutment. Because traditional construction methods use disc-lock scaffolds for both tie beam and end crossbeam construction, the bottom needs to be leveled during scaffold erection, and additional uprights are needed for the support of the next segment to expand the support surface before assembling the next segment. Therefore, after the tie beam construction is completed, it is necessary to widen the contact area between the uprights and the ground, and then raise it further. This requires dismantling the original scaffolding and rebuilding the end beam construction scaffolding platform. Repeated installation and dismantling require a lot of manpower and resources, as well as a large amount of steel. Therefore, it is necessary to design a composite scaffolding structure that can reduce scaffolding erection time, reduce steel usage, and can be applied to the construction of tie beams, arch seats, and end beams. Summary of the Invention

[0004] The purpose of this utility model is to address the problems existing in the prior art by providing a composite support structure for the construction of tie beams, arch seats, and end beams. After the tie beam has been poured and cured to the required standard, this composite support structure only requires disassembling the top steel plate platform structure and then extending the support to allow the construction operation platform to reach the bottom of the end beam. The steel plate platform is then reinstalled, and personnel will weld the arch seats and the ends of the end beams onto this platform to achieve the welding purpose of the end beam ends and arch seats. This effectively avoids repeated installation and disassembly of the support and the large amount of steel used, reducing the support erection time. It has advantages such as simple structure, convenient construction, and good stability, and can be widely used in bridge, building, and other engineering fields.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A composite support structure for the construction of tie beams, arch seats, and end beams includes a steel plate platform. Multiple square steel bars are evenly welded along the length of the bottom of the steel plate platform. Multiple I-beams are evenly welded to the bottom of each square steel bar. The I-beams connect the corresponding square steel bars in series. A double-section I-beam is welded to each end of the bottom of each I-beam, and the two double-section I-beams connect the ends of the multiple I-beams in series. Four extendable columns are symmetrically welded to the bottom of each of the two double-section I-beams. The columns are extended using connecting flanges and bolts. Two columns are supported at the ends of the double-section I-beams, with their bottom ends supported on a bearing platform. The remaining two columns are symmetrically supported in the middle of the double-section I-beams, with their bottom ends directly driven into the ground. Shear bracing and cross bracing connect adjacent columns, with the cross bracing located between the two columns at the upper and lower ends of the shear bracing.

[0007] A further preferred embodiment: the column is composed of multiple bolted segmental columns, heightened segmental columns, and a platform segmental column spliced ​​together, with the platform segmental column located at the top of the column.

[0008] A further preferred embodiment: the platform segment upright includes a platform segment vertical rod, the bottom end of which is welded with a connecting flange plate for connection with the bolted segment upright using upright connecting bolts, a stiffening rib connecting the platform segment vertical rod and the connecting flange plate, and a top support provided at the top of the platform segment vertical rod. The top support adopts a structure commonly used in the industry and can be purchased and installed commercially.

[0009] Further preferred embodiment: Both the bolted segmental uprights and the heightened segmental uprights include corresponding segmental verticals. The top and bottom ends of the segmental verticals are welded with connecting flange plates, and stiffening ribs are connected between the segmental verticals and the connecting flange plates. Four strut bolt plates are evenly distributed at the top and bottom ends of the segmental verticals for connecting with the scissor braces and cross braces using strut fixing bolts. Scissor braces and cross braces are connected between two adjacent segmental verticals at the same height.

[0010] The composite support structure for the construction of tie beams, arch abutments, and end crossbeams has advantages such as simple structure, convenient construction, and good stability. It can be applied to the substructure construction of large-volume tied-arch steel-concrete composite bridges. After the tie beam is poured and cured, it effectively avoids repeated installation and dismantling of the support, allowing for bolted extension of support segments. Furthermore, the vertical members of each segment have different lengths to adapt to on-site construction requirements, significantly shortening the support installation and dismantling time and effectively improving construction efficiency. Since the end construction of tied-arch steel-concrete composite bridges occurs at different times, this composite support structure can be reused, improving resource utilization. It is applicable to the segmental construction technology of tie beams, arch abutments, and end crossbeams for large-volume tied-arch steel-concrete composite bridges. Attached Figure Description

[0011] Figure 1 A structural diagram of a composite support structure for the construction of tie beams, arch seats and end beams;

[0012] Figure 2 for Figure 1 A diagram showing the view from the right.

[0013] Figure 3 A schematic diagram of the connection structure between scissor braces, cross braces, and bolted segmental uprights;

[0014] Figure 4 A schematic diagram of the connection structure between the steel plate platform and the platform segment uprights;

[0015] Figure 5 A schematic diagram of the platform segment support structure;

[0016] Figure 6 A schematic diagram of the structure for bolted segment uprights and heightened segments;

[0017] Figure 7 A schematic diagram of the installation structure of a steel plate platform as a construction support for end crossbeams;

[0018] The names corresponding to the serial numbers in the figure are:

[0019] 1. Steel plate platform; 2. I-beam; 3. Steel square bar; 4. Double-jointed I-beam; 5. Platform segment uprights; 6. Bolted segment uprights; 7. Scissor bracing; 8. Horizontal bracing; 9. Heightened segment uprights; 10. Support rod fixing bolts; 11. Upright connecting bolts; 12. Top support; 13. Platform segment vertical members; 14. Stiffening ribs; 15. Connecting flange plates; 16. Support rod bolt plates; 17. Segment vertical members; 18. Piers; 19. Tie beams; 20. End crossbeams; 21. Arch seats. Detailed Implementation

[0020] To provide a more detailed description of this utility model, the following description, in conjunction with the embodiments and accompanying drawings, will further illustrate this utility model. Example

[0021] A composite support structure for the construction of tie beams, arch seats, and end beams includes a steel plate platform 1. Multiple steel square bars 3 are evenly welded along the length of the bottom of the steel plate platform 1. Multiple I-beams 2 are evenly welded to the bottom of the steel square bars 3. The multiple I-beams 2 connect the corresponding steel square bars 3 in series. A double-section I-beam 4 is welded to each end of the bottom of the multiple I-beams 2. Two double-section I-beams 4 connect the ends of the multiple I-beams 2 in series. Four extendable columns are symmetrically welded to the bottom of each of the two double-section I-beams 4. The columns are extended using connecting flange plates 15 and upright connecting bolts 11. Two columns are supported at the ends of the double-section I-beams 4, and the remaining two columns are symmetrically supported in the middle of the double-section I-beams 4. Shear braces 7 and cross braces 8 connect adjacent columns.

[0022] The column is composed of multiple bolted segmental columns 6, heightened segmental columns 9, and a platform segmental column 5, with the platform segmental column 5 located at the top of the column.

[0023] The platform segment upright 5 includes a platform segment vertical rod 13. The bottom end of the platform segment vertical rod 13 is welded with a connecting flange plate 15 for connecting with the bolted segment upright 6 using upright connecting bolts 11. A stiffening rib 14 is connected between the platform segment vertical rod 13 and the connecting flange plate 15. A top support 12 is provided at the top end of the platform segment vertical rod 13.

[0024] Both the bolted segmental uprights 6 and the heightened segmental uprights 9 include corresponding segmental uprights 17. The top and bottom ends of the segmental uprights 17 are respectively welded with connecting flange plates 15. A stiffening rib 14 is connected between the segmental uprights 17 and the connecting flange plates 15. Four strut bolt plates 16 are evenly distributed at the top and bottom ends of the segmental uprights 17 for connecting with the scissor braces 7 and the cross braces 8 using strut fixing bolts 10.

[0025] During construction, a platform for the tie beam construction is first erected. The bottom ends of the columns at both ends are supported on the bearing platform, while the bottom ends of the middle column are driven into the ground to reach the hard foundation. The columns are adjusted to the design elevation for the tie beam construction, and the support structure is erected from bottom to top according to the connection relationship of the composite support structure. The tie beam is constructed according to conventional construction requirements. After the tie beam is poured and cured to the required standard, the steel plate platform 1, steel square bars 3, and I-beams 2 are dismantled. The columns are extended and adjusted to the design elevation for the end crossbeam construction. Then, the steel plate platform 1, steel square bars 3, and I-beams 2 are welded onto the double-jointed I-beams 4 to serve as the arch seat and end crossbeam construction platform.

[0026] The platform segmental vertical rods 13 and 17 are made of steel pipes with a diameter of 630 mm. The scissor braces 7 and 8 are made of 20a# channel steel. The double-section I-beams are made of 56a I-beams, and I-beam 2 is made of 40a I-beams, with a spacing of 100 cm. Through model calculation and analysis, the maximum combined stress of the steel columns is 134.2 MPa < 215 MPa; the maximum combined stress of the double-section I-beams is 185.6 MPa < 215 MPa, and the maximum shear stress is 50 MPa < 125 MPa; the maximum combined stress of I-beam 2 is 125.4 MPa < 215 MPa, and the maximum shear stress is 33.7 MPa < 125 MPa, all meeting the requirements.

[0027] The composite support structure for the construction of tie beams, arch seats, and end crossbeams can be used for the construction of tie beams, arch seats, and end crossbeams. It is installed between the two piers 18 in the transverse direction of the bridge. After the tie beam 19 is poured and cured, the structure of the I-beam 2 and above can be dismantled, and the support segments can be bolted and extended to reach the connection construction height between the end crossbeam 20 and the arch seat 21. Then, the structure of the I-beam 2 and above can be installed to connect the crossbeam 20 and the arch seat 21. The construction process greatly shortens the support installation and dismantling time and effectively improves construction efficiency.

[0028] The above description is not intended to limit the present utility model, nor is the present utility model limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should be protected by the present utility model.

Claims

1. A composite support structure for the construction of tie beams, arch seats and end beams, comprising a steel plate platform (1), characterized in that: The bottom of the steel plate platform (1) is evenly welded with multiple steel square bars (3) along the length direction. Multiple I-beams (2) are evenly welded to the bottom of the multiple steel square bars (3). The multiple I-beams (2) connect the multiple steel square bars (3) at corresponding positions in series. A double-jointed I-beam (4) is welded to each end of the bottom of the multiple I-beams (2). The two double-jointed I-beams (4) connect the two ends of the multiple I-beams (2) in series. Four columns that can be extended are symmetrically welded to the bottom of the two double-jointed I-beams (4). A scissor brace (7) and a cross brace (8) are connected between two adjacent columns.

2. The composite support structure for the construction of tie beams, arch seats, and end crossbeams according to claim 1, characterized in that: The column is composed of multiple bolted segmental columns (6), heightened segmental columns (9), and a platform segmental column (5), with the platform segmental column (5) located at the top of the column.

3. The composite support structure for the construction of tie beams, arch seats, and end crossbeams according to claim 2, characterized in that: The platform segment upright (5) includes a platform segment vertical rod (13). The bottom end of the platform segment vertical rod (13) is welded with a connecting flange plate (15) for connecting with the bolted segment upright rod (6) using upright connecting bolts (11). A stiffening rib (14) is connected between the platform segment vertical rod (13) and the connecting flange plate (15). A top support (12) is provided at the top of the platform segment vertical rod (13).

4. The composite support structure for the construction of tie beams, arch seats, and end crossbeams according to claim 2, characterized in that: Both the bolted segmental upright (6) and the heightened segmental upright (9) include corresponding segmental uprights (17). The top and bottom ends of the segmental uprights (17) are respectively welded with connecting flange plates (15). There are stiffening ribs (14) connecting the segmental uprights (17) and the connecting flange plates (15). Four strut bolt plates (16) are evenly distributed at the top and bottom ends of the segmental uprights (17) for connecting with the scissor braces (7) and the cross braces (8) by strut fixing bolts (10).

Images