Connecting structure of elevated bridge prefabricated bearing platform
By leaving circular pile foundation holes in the connection structure of the prefabricated support platform of the overpass bridge and setting up annular stirrups and chiseling treatments, the reliability and tolerance problems of the connection of the prefabricated support platform of the overpass bridge in the prior art are solved, and the effect of simple structure and reducing on-site workload is achieved.
Patent Information
- Application Number
- CN202422218433.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-10
AI Technical Summary
The prior art is difficult to achieve reliable connections, good tolerance, simple construction and reduce on-site workload in the prefabricated load connection of overpass bridges.
A connection structure including columns is adopted to arrange on the prefabricated support platform and the prefabricated support platform is arranged on the pile foundation. The prefabricated support platform reserves circular pile foundation holes, the pile foundation is embedded in the hole, and annular stirrups and chiseling treatment are provided in the holes.
It realizes reliable connection of the prefabricated bearing of the overpass bridge, adapts to pile foundation construction errors, is simple in structure, reduces on-site workload, and improves the prefabricated assembly rate of the project.
Smart Images
Figure CN223003276U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a connection structure, in particular to a connection structure for a precast bearing platform of an elevated bridge. Background Technique
[0002] The precast bearing platform technology is currently often applied to the underwater piers of large bridges, adapting to the characteristics of short offshore operation time and strong ship transportation and hoisting capabilities. Urban elevated bridges mostly use pile group foundations, and the bearing platform has a large size. Limited by the size and self-weight of the bearing platform, and the bearing platform adopts the steel bar modular technology, there is no significant advantage compared with the cast-in-situ method. Considering the construction period and economy, there is no large-scale application case in China.
[0003] The precast bearing platform construction technology can be used for the bearing platforms with smaller sizes in urban ramp bridges or small-span highway bridge projects. There are large errors in pile foundation construction. The connection structures between the precast bearing platform and the pile foundation, and between the precast bearing platform and the bridge pier must be able to meet the requirements of large construction tolerances. The effective connection between the precast bearing platform and the pile foundation is the key technology. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide a connection structure for a precast bearing platform of an elevated bridge, which has reliable connection, good tolerance, simple structure and less on-site workload.
[0005] The technical solution adopted by the utility model to solve the above technical problem is to provide a connection structure for a precast bearing platform of an elevated bridge, including a column, the column is arranged on the precast bearing platform, the precast bearing platform is arranged on the pile foundation, wherein, the pile foundation adopts precast piles or bored cast-in-place piles, the precast bearing platform is provided with a circular pile foundation hole, the circular pile foundation hole includes a through upper hole and a lower hole, the diameter D2 of the lower hole of the circular pile foundation hole is larger than the diameter D1 of the pile foundation, a 45° oblique angle is adopted for gradual transition between the upper hole and the lower hole of the circular pile foundation hole, the pile foundation is embedded in the lower hole of the circular pile foundation hole, a circular stirrup is arranged in the circular pile foundation hole and the inner wall of the hole is treated by roughening.
[0006] Further, the precast pile is a PHC pipe pile or a steel pipe pile.
[0007] Further, the diameter of the upper hole of the circular pile foundation hole is smaller than the diameter D1 of the pile foundation, and the depth of the pile foundation embedded in the lower hole of the precast bearing platform is 0.7D1.
[0008] Further, the diameter D2 of the lower hole of the circular pile foundation hole is 200mm larger than the diameter D1 of the pile foundation, and the diameter of the upper hole of the circular pile foundation hole is 600mm.
[0009] Further, the number of the pile foundations is 4, which are distributed in a rectangle, and low-shrinkage concrete is poured into the holes of the pile foundations.
[0010] Furthermore, the column and the precast cap are connected by a sleeve.
[0011] The utility model has the following beneficial effects compared with the prior art: The connection structure of the precast cap of the elevated bridge provided by the utility model has reliable connection, good tolerance, is applicable to precast piles and bored cast-in-place piles, and can adapt to the errors in pile foundation construction; meanwhile, the structure is simple, reducing the workload of on-site steel bar binding, welding, etc., and improving the prefabrication and assembly rate of the overall project. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic elevation structure diagram of the connection structure of the precast cap of the elevated bridge of the utility model;
[0013] Figure 2 It is a schematic plan structure diagram of the connection structure of the precast cap of the elevated bridge of the utility model.
[0014] The markings in the figure are:
[0015] 1 Column 2 Precast cap 3 Pile foundation
[0016] 4 Circular pile foundation hole 5 Circular stirrup 6 Inner wall of the hole DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] The following further describes the utility model in conjunction with the drawings and embodiments.
[0018] Figure 1 It is a schematic elevation structure diagram of the connection structure of the precast cap of the elevated bridge of the utility model; Figure 2 It is a schematic plan structure diagram of the connection structure of the precast cap of the elevated bridge of the utility model.
[0019] Please refer to Figure 1 and Figure 2 , the connection structure of the precast cap of the elevated bridge provided by the utility model includes a column 1, the column 1 is arranged on the precast cap 2, the precast cap 2 is arranged on the pile foundation 3, wherein, the pile foundation 3 is a precast pile or a bored cast-in-place pile, the precast cap 2 is provided with a circular pile foundation hole 4, the circular pile foundation hole 4 includes a through upper hole and a lower hole, the diameter D2 of the lower hole of the circular pile foundation hole 4 is larger than the diameter D1 of the pile foundation 3, the upper hole and the lower hole of the circular pile foundation hole 4 are gradually transitioned by a 45° bevel, the pile foundation 3 is embedded in the lower hole of the circular pile foundation hole 4, a circular stirrup 5 is arranged in the circular pile foundation hole 4 and the inner wall 6 of the hole is treated by roughening to improve the punching shear resistance of the precast cap 2.
[0020] The connecting structure of the precast cap for elevated bridges provided by the present utility model, wherein the precast piles are PHC pipe piles or steel pipe piles; the diameter of the upper hole of the circular pile foundation hole 4 is smaller than the diameter D1 of the pile foundation 3, and the depth of the pile foundation 3 embedded in the lower hole of the precast cap 2 is 0.7D1; it can be used for caps with smaller sizes in urban ramp bridges or small-span highway bridge projects and can adapt to the errors in pile foundation construction.
[0021] The connecting structure of the precast cap for elevated bridges provided by the present utility model, wherein the diameter D2 of the lower hole of the circular pile foundation hole 4 is 200 mm larger than the diameter D1 of the pile foundation 3 to adapt to the pile foundation construction error; the diameter of the upper hole of the circular pile foundation hole 4 is 600 mm, so that the hole on the top of the pile forms a conical shape.
[0022] The connecting structure of the precast cap for elevated bridges provided by the present utility model, wherein the number of the pile foundations 3 is 4, which are distributed in a rectangle, and low-shrinkage concrete is poured into the holes of the pile foundations 3. The column 1 and the precast cap 2 are connected by a sleeve.
[0023] The connecting structure of the precast cap for elevated bridges provided by the present utility model has a simple structure and reliable connection, greatly reducing the on-site workload. The specific construction process is as follows:
[0024] (1) Bind the cap steel bars in the factory and pour the concrete of the precast part. After the concrete strength reaches 90%, chisel the concrete in the reserved holes to form the precast cap 2; synchronously construct the pile foundation 3.
[0025] (2) Excavate the cap foundation pit, level the foundation pit site, and pour the concrete cushion at the bottom of the cap; the concrete cushion has sufficient strength and flatness to support the weight of the precast cap 2.
[0026] (3) Clean and chisel the surface of the pile foundation 3 within the cap embedding range.
[0027] (4) Lift and install the precast cap 2, insert the pile head into the reserved cap hole, and adjust the position, elevation and horizontal accuracy of the cap.
[0028] (5) Pour the concrete in the circular pile foundation hole 4 and the embedded column notch, and cure the concrete.
[0029] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be defined by the claims.
Claims
1. A connection structure of a prefabricated cap for an elevated bridge, comprising a column (1), wherein the column (1) is arranged on a prefabricated cap (2), and the prefabricated cap (2) is arranged on a pile foundation (3), characterized in that: The pile foundation (3) is a prefabricated pile or a bored pile. The prefabricated cap (2) is provided with a circular pile foundation hole (4). The circular pile foundation hole (4) comprises an upper hole and a lower hole which are connected to each other. The diameter D2 of the lower hole of the circular pile foundation hole (4) is larger than the diameter D1 of the pile foundation (3). A 45° bevel gradient transition is adopted between the upper hole and the lower hole of the circular pile foundation hole (4). The pile foundation (3) is embedded in the lower hole of the circular pile foundation hole (4). An annular stirrup (5) is arranged in the circular pile foundation hole (4) and the inner wall (6) of the hole is roughened.
2. The connection structure of the prefabricated cap of the viaduct according to claim 1, characterized in that: The prefabricated piles are PHC pipe piles or steel pipe piles.
3. The connection structure of the prefabricated cap of the viaduct according to claim 1, characterized in that: The diameter of the upper hole of the circular pile foundation hole (4) is smaller than the diameter D1 of the pile foundation (3), and the depth of the lower hole of the pile foundation (3) embedded in the prefabricated foundation (2) is 0.7D1.
4. The connection structure of the prefabricated cap of the viaduct according to claim 3, characterized in that: The diameter D2 of the lower hole of the circular pile foundation hole (4) is 200 mm larger than the diameter D1 of the pile foundation (3), and the diameter of the upper hole of the circular pile foundation hole (4) is 600 mm.
5. The connection structure of the prefabricated cap of the viaduct according to claim 1, characterized in that: The number of the pile foundations (3) is 4 and they are distributed in a rectangular shape. Low shrinkage concrete is poured into the holes of the pile foundations (3).
6. The connection structure of the prefabricated cap of the viaduct according to claim 1, characterized in that: The column (1) and the prefabricated support platform (2) are connected by a sleeve.