Prefabricated UHPC (Ultra High Performance Concrete) hollow pier reinforced by lattice type steel ribs

Abstract

The utility model relates to the technical field of assembly type bridge structures, and discloses a lattice type steel rib reinforced prefabricated UHPC (Ultra High Performance Concrete) hollow pier which comprises a UHPC shell and a lattice type profile steel skeleton, a cavity is formed in the central area of the lattice type profile steel framework; meanwhile, the UHPC shell covers the periphery of the lattice type profile steel framework and is fixedly connected with the lattice type profile steel framework; the lattice type profile steel framework comprises a plurality of triangular units; the UHPC shell is used for replacing a solid pier, the using amount of concrete and reinforcing steel bars is reduced, the weight is reduced, transportation and hoisting are convenient, and the high-strength characteristic of UHPC is fully exerted. And in combination with the lattice type steel ribs, the bearing capacity and shock resistance of the UHPC shell structure are enhanced, the advantages of steel and UHPC are complementary, and the overall performance is improved. The modular design promotes prefabrication and rapid on-site assembly, shortens the construction time, simplifies the operation process and reduces the environmental influence, and the standardized interface ensures efficient butt joint installation.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled bridge structures, in particular to a lattice steel-frame reinforced prefabricated UHPC hollow bridge pier. Background Art

[0002] Structural assembly can utilize the high quality of prefabricated components in factories and give full play to the high efficiency of on-site mechanized assembly, thereby achieving the goals of improving quality, increasing efficiency, reducing dependence on labor, saving energy and reducing emissions, and achieving green and environmentally friendly construction industry industrialization.

[0003] At present, the assembly of bridge structures has also become a hot topic in industry research, and related research and development work is mainly focused on prefabricated bridge piers and their connection with the abutment. The mature steel sleeve grouting connection technology and metal corrugated pipe steel slurry anchor steel connection technology in the field of housing construction have also been introduced into the node connection structure of prefabricated bridge piers, forming a market-oriented and feasible assembled bridge pier technology.

[0004] However, since current technology directly copies relevant technologies in the field of housing construction, when directly transplanting housing construction technology to bridge engineering, it is necessary to carefully consider the practical problems such as large size and heavy weight of bridge components. The main challenge facing current technology is that the prefabricated components are divided too finely, resulting in a large number of segments and numerous connection nodes, which not only pushes up the cost of the project, but also increases the cost of the project and affects the overall structural safety. In view of this, it is urgent to explore an innovative bridge assembly technology route, which should have the following characteristics: optimized force performance to reduce the weight and size of individual components; efficient use of materials to reduce resource waste; and can significantly reduce the complexity of on-site assembly, ensure the reliability and economy of node connection, break through the current technical system, and have important significance for the development and improvement of bridge structure assembly technology. Utility Model Content

[0005] In view of the above-mentioned technical deficiencies, the technical problem to be solved by the utility model is to provide a prefabricated UHPC hollow bridge pier with lattice steel reinforcement, aiming to solve the problems of poor stress performance, heavy component weight and insufficient material saving of the current prefabricated bridge piers.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: the utility model provides a prefabricated UHPC hollow bridge pier with lattice steel frame reinforcement, including: a UHPC shell and a lattice steel frame; the central area of ​​the lattice steel frame is a cavity; at the same time, the UHPC shell is wrapped around the lattice steel frame and fixedly connected to the lattice steel frame.

[0007] Furthermore, the lattice steel frame includes a plurality of triangular units; wherein the triangular units are right-angled triangles.

[0008] Furthermore, the two right-angled sides of the triangular unit are respectively a vertical column and a horizontal rod; and the hypotenuse of the triangular unit is an oblique rod.

[0009] Furthermore, the oblique rods are arranged between the horizontal rods (22) located at the upper layer and the lower layer, and adjacent oblique rods are staggered in space.

[0010] Furthermore, the upright posts, horizontal rods and diagonal rods are fixedly connected.

[0011] Furthermore, the UHPC shell at least covers the column.

[0012] Furthermore, the columns are arranged at equal intervals along a circumference of the UHPC shell, and the number of the columns is determined according to the force requirements.

[0013] Furthermore, the column is an I-shaped steel column.

[0014] Furthermore, it also includes a threaded connector built into the oblique rod, and the threaded connector is used to adjust the length of the oblique rod.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model replaces the solid section of the traditional reinforced concrete bridge pier with the UHPC shell, making full use of the ultra-high strength performance of UHPC, which can reduce the volume of concrete and the amount of steel bars used. At the same time, it further reduces the weight of the prefabricated bridge pier components, making transportation and hoisting more convenient;

[0017] 2. The utility model utilizes a lattice steel skeleton to strengthen the UHPC shell, and utilizes the high strength of the steel to match and work together with the ultra-high-strength UHPC to improve the bearing capacity and seismic resistance of the prefabricated pier components.

[0018] 3. The modular characteristics of the utility model enable bridge piers to be prefabricated and quickly assembled on site, which greatly shortens the construction period and reduces the complexity of on-site operations and the impact on the environment. In particular, the standardized interface design of the I-shaped steel columns and the horizontal and diagonal bars facilitates precise alignment and quick connection, thereby improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1A schematic structural diagram of a lattice steel-reinforced prefabricated UHPC hollow bridge pier provided in an embodiment of the utility model.

[0021] Figure 2 Schematic diagram of lattice steel frame.

[0022] Figure 3 for Figure 1 Cross-sectional view of .

[0023] Explanation of reference numerals: 1. UHPC shell, 2. lattice steel frame, 21. column, 22. horizontal rod, 23. diagonal rod. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figures 1 to 3 As shown, the utility model provides a lattice steel-reinforced prefabricated UHPC hollow bridge pier, comprising:

[0026] UHPC shell 1 and lattice steel frame 2; the central area of ​​lattice steel frame 2 is a cavity; at the same time, UHPC shell 1 is wrapped around lattice steel frame 2 and fixedly connected to lattice steel frame 2. It should be noted that UHPC, i.e. ultra-high performance concrete, is an advanced building material with a strength 4-8 times that of ordinary concrete and excellent durability. The UHPC shell 1 is wrapped around the lattice steel frame, which not only enhances the compressive and impact resistance of the bridge pier, but also forms a more integrated composite structural system through close integration with the lattice steel frame, effectively preventing the corrosive medium from entering the steel frame and extending the service life of the structure; for the connection node between UHPC shell 1 and lattice steel frame 2, embedded metal anchors or chemical anchor bolts designed specifically for UHPC can be used to ensure the connection strength and reliability of the two and prevent detachment under extreme loads. The node design also includes anti-shear reinforcement measures, such as adding angle steel or steel plate reinforcement sheets to improve the shear bearing capacity of the node area. In addition, due to the different linear expansion coefficients of UHPC and steel, measures are taken in the design to reduce the internal stress caused by temperature differences; for example, flexible gaskets are set on the contact surface between the UHPC shell 1 and the lattice steel frame 2, or sufficiently wide expansion joints are reserved to allow the material to move freely due to temperature changes, thereby reducing the adverse effects of temperature stress on the structure.

[0027] In addition, the cavity design of the lattice steel frame 2 greatly reduces the deadweight of the structure, which not only saves material costs but also facilitates the layout of internal pipelines, and reserves space for the maintenance of the piers and possible functional expansion in the future. If the structure needs to be inspected or repaired in the future, the cavity provides a direct channel, simplifying the maintenance procedure.

[0028] The lattice steel frame 2 includes a number of triangular units, wherein the triangular unit is a right triangle. The two right-angled sides of the triangular unit are the column 21 and the horizontal rod 22 respectively; the hypotenuse of the triangular unit is the diagonal rod 23; the diagonal rod 23 is arranged between the horizontal rods 22 located on the upper layer and the lower layer, and the adjacent diagonal rods 23 are staggered in space; and the spacing between the horizontal rods 22 of the upper layer and the lower layer can also be determined according to the force. It should be noted that the design layout of the lattice steel frame 2 composed of right-angled triangular units can not only effectively disperse the vertical load, but also the staggered arrangement of the diagonal rods 23 greatly enhances the resistance of the structure to horizontal loads such as wind loads, seismic forces, etc., realizes three-dimensional dispersion of loads, and improves the stability and seismic performance of the overall bridge pier.

[0029] The columns 21, horizontal bars 22 and diagonal bars 23 are fixedly connected. The UHPC shell 1 at least covers the columns 21; the columns 21 are arranged at equal intervals around the UHPC shell 1, and the number of the columns 21 is determined according to the force requirements; the columns 21 are I-shaped steel columns. It should be noted that: in view of the fact that the bridge structure is subjected to dynamic loads such as repeated loads generated by vehicle driving for a long time, fatigue strength enhancement measures can also be designed for the connection between the diagonal bars 23 and the horizontal bars 22, such as using smooth transition connection details to reduce stress concentration, or using high fatigue strength steel and special welding technology to ensure the fatigue resistance of the structure in long-term service; in addition, the use of I-shaped steel columns 21, compared with solid steel columns, can significantly reduce the amount of steel used while maintaining the same bearing capacity, thereby reducing the project cost.

[0030] Example 2

[0031] Based on Example 1, in order to make the structure of the utility model more flexible, this embodiment also carries out modular design of the lattice steel frame 2, each module contains a plurality of triangular units, and the units are assembled by quick connectors such as high-strength bolts, which is not only convenient for transportation and on-site installation, but also can flexibly adjust the height and diameter of the bridge pier according to actual needs, thereby improving the versatility and adaptability of the design. In addition, the diagonal rod 23 is designed as a member with adjustable length. Through the built-in threaded connector, that is, an adjustment rod or sleeve structure with internal and external threads, when the length needs to be adjusted, the relative movement of the two parts along the thread direction can be achieved by rotating the threaded connector, so that the two ends of the diagonal rod are extended or shortened along the thread path, thereby changing its overall length. This method is simple and reliable, and has high adjustment accuracy. The inclination angle and length of the diagonal rod can be fine-tuned according to the on-site installation conditions and actual load conditions, optimizing the structural force distribution and enhancing the overall stability.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A prefabricated UHPC hollow bridge pier with lattice steel reinforcement, characterized in that: include: UHPC shell (1) and lattice steel frame (2); The central area of ​​the lattice steel frame (2) is a cavity; at the same time, the UHPC shell (1) is wrapped around the lattice steel frame (2) and is fixedly connected to the lattice steel frame (2).

2. A lattice steel reinforced prefabricated UHPC hollow bridge pier as claimed in claim 1, characterized in that: The lattice steel frame (2) comprises a plurality of triangular units; wherein the triangular units are right-angled triangles.

3. The lattice steel reinforced prefabricated UHPC hollow bridge pier according to claim 2, characterized in that: The two right-angled sides of the triangular unit are respectively a vertical column (21) and a horizontal rod (22); and the hypotenuse of the triangular unit is an oblique rod (23).

4. The lattice steel reinforced prefabricated UHPC hollow bridge pier according to claim 3, characterized in that: The oblique rods (23) are arranged between the horizontal rods (22) located at the upper layer and the lower layer, and adjacent oblique rods (23) are staggered in space.

5. The lattice steel-reinforced prefabricated UHPC hollow bridge pier according to claim 3, characterized in that: The upright post (21), the horizontal rod (22) and the diagonal rod (23) are fixedly connected.

6. The lattice steel reinforced prefabricated UHPC hollow bridge pier according to claim 3, characterized in that: The UHPC shell (1) at least covers the column (21).

7. The lattice steel reinforced prefabricated UHPC hollow bridge pier according to claim 3, characterized in that: The columns (21) are arranged at equal intervals along a circumference of the UHPC shell (1), and the number of the columns (21) is determined according to force requirements.

8. The lattice steel-reinforced prefabricated UHPC hollow bridge pier according to claim 3, characterized in that: The column (21) is an I-shaped steel column.

9. The lattice steel-reinforced prefabricated UHPC hollow bridge pier according to claim 3, characterized in that: It also includes a threaded connector built into the oblique rod (23), wherein the threaded connector is used to adjust the length of the oblique rod (23).

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