A segmental connection structure for reinforced prefabricated hollow bridge piers made of steel-concrete composite

Abstract

This utility model relates to a segmental connection structure for prefabricated hollow bridge piers reinforced with steel-concrete composite, belonging to the field of structural engineering technology. The structure consists of prefabricated hollow pier segments, a lattice-structured steel-concrete composite stiffening frame, shear keys, grouting steel pipes, UHPC grouting material, and a bedding layer. The lattice-structured steel-concrete composite stiffening frame includes steel-concrete composite column members and steel web members, which are pre-embedded inside the prefabricated hollow pier segments. One prefabricated hollow pier segment is welded with a grouting steel pipe, while the other prefabricated hollow pier segment has an extended section of the steel-concrete composite column member. Shear keys are also provided on the extended section of the steel-concrete composite column member. UHPC grouting material is injected between the grouting steel pipe, the steel-concrete composite column member, and the shear keys, thereby achieving a reliable connection between the prefabricated pier segments. This utility model can reduce the lifting weight of prefabricated piers, improve the construction flexibility of prefabricated bridge piers, leverage the excellent mechanical properties of various materials, and enhance the seismic performance of prefabricated piers.

Description

Technical Field

[0001] This utility model relates to a segmental connection structure for reinforced prefabricated hollow bridge piers made of steel-concrete composite, belonging to the field of structural engineering technology. Background Technology

[0002] Since the beginning of the 21st century, with the development of modern bridge construction technology, the requirements for bridge construction speed, construction quality, the impact of construction on the existing environment, and carbon emissions during construction have gradually increased. This also meets the requirements of low-carbon construction and has a positive impact on building an environmentally friendly society.

[0003] To meet the requirements of modern bridge construction, precast assembled bridge pier structures have emerged. In existing precast assembled bridge pier systems, piers are mostly integral structures with solid cross-sections, resulting in a large overall weight. This hinders the improvement of construction convenience and lightweight pier design. Furthermore, the steel reinforcement cage binding process in existing precast assembled bridge pier systems is cumbersome and largely manual, consuming significant manpower and time, thus impeding further standardization and industrialization in production. Meanwhile, lattice-type steel-concrete composite stiffened frame structures exhibit superior compressive and bending performance. The lattice design allows multiple steel-concrete composite structures to work collaboratively, sharing the load and further leveraging their excellent mechanical properties. Applying this to precast assembled bridge pier systems can positively impact the overall seismic performance of the system.

[0004] In conclusion, optimizing the structure of prefabricated bridge piers, achieving lightweight design, enhancing the construction convenience of prefabricated bridge pier structural systems, improving the standardization and industrialization of prefabricated bridge pier production, and enhancing the seismic performance of prefabricated bridge piers are of great significance for the further development of prefabricated bridge pier structural systems in modern bridge engineering. Utility Model Content

[0005] To address the aforementioned deficiencies in existing technologies, this utility model proposes a segmental connection structure for reinforced prefabricated hollow bridge piers made of steel-concrete composite, which solves the problems of pier lifting weight, construction flexibility, seismic performance improvement, and standardized production.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A segmental connection structure for prefabricated hollow bridge piers reinforced with steel-concrete composite tubes includes at least two adjacent prefabricated hollow pier segments. Each prefabricated hollow pier segment includes a prefabricated concrete solid portion and a hollow layer. A lattice-type steel-concrete composite tube stiffening frame is pre-embedded in the concrete solid portion of the prefabricated pier segment. The lattice-type steel-concrete composite tube stiffening frame includes steel-concrete composite tube columns and steel web members.

[0008] In this section, a grouting steel pipe is welded to the lower end of the steel-concrete composite column of a precast hollow pier segment; the upper end of the steel-concrete composite column of another adjacent precast hollow pier segment extends outward, thus forming a steel-concrete composite column extension section, which extends upward and is fixed inside the grouting steel pipe.

[0009] Shear keys are also provided on the extended section of the steel-concrete composite column, and UHPC grouting material is injected between the grouting steel pipe, the steel-concrete composite column, and the shear keys.

[0010] Furthermore, the shear keys are uniformly welded onto the concrete-filled steel tube column.

[0011] Furthermore, the steel-concrete composite column members and the steel web members are welded together as a single unit.

[0012] Furthermore, the steel-concrete composite column is composed of a steel-concrete composite column and the concrete inside it.

[0013] Furthermore, the grouting steel pipe is provided with grouting holes and grout outlet holes.

[0014] Furthermore, a grouting layer is also provided at the joint surface of the upper end of the other adjacent precast hollow pier segment.

[0015] Furthermore, the yield strength of the steel in the concrete-filled steel tube column, the steel web members, and the grouting steel pipe shall not be less than 345 MPa.

[0016] Furthermore, the compressive strength of the UHPC grout and the grouting layer is not less than 120 MPa.

[0017] By adopting the above technical solution, this utility model has at least one of the following beneficial effects compared with the prior art:

[0018] This utility model proposes a steel-concrete composite reinforced prefabricated hollow bridge pier segment connection structure. A lattice-type steel-concrete composite stiffening skeleton is embedded within the prefabricated pier segment, and a hollow layer is set inside the prefabricated pier segment. This avoids the cumbersome process of reinforcing cage binding during the prefabricated pier segment production, further simplifying the production process of prefabricated bridge piers and achieving a lightweight design for the prefabricated pier segments. Simultaneously, the pre-embedded lattice-type steel-concrete composite stiffening skeleton within the prefabricated pier segment fully utilizes the excellent mechanical properties of the lattice-type steel-concrete composite, working collaboratively with the prefabricated pier segment to share the load. The steel-concrete composite columns within the stiffening skeleton achieve reliable connections between adjacent piers, ensuring the seismic performance of the prefabricated pier segments. This further improves the overall economic and environmental benefits of the prefabricated prefabricated pier segment connection structure. Specific beneficial effects are as follows:

[0019] 1. This utility model addresses the connection structure of pier segments by pre-embedding a standardized, industrially produced lattice-type steel-concrete composite stiffening frame within the precast pier segments. Simultaneously, a hollow layer is constructed along the entire length of the precast pier segment, eliminating the need for core concrete in the precast pier section. This achieves lightweight design and standardized production of the lattice-type steel-concrete composite stiffening frame, eliminating cumbersome processes such as rebar cage binding during precast pier segment production and fabrication. This further improves the precast assembly level of pier segments, accelerates production speed, and reduces the manpower, material resources, and financial resources consumed in the production, transportation, and on-site hoisting of precast pier segments. Ultimately, it enhances the overall economic and environmental benefits of precast pier segments.

[0020] 2. The lattice-type steel-concrete composite stiffening frame is pre-embedded inside the precast pier segments. This fully utilizes the excellent mechanical properties of the lattice-type steel-concrete composite, working collaboratively with the precast pier segment concrete to share the load, thus positively impacting the seismic performance of the precast pier segments. Simultaneously, the structure of the lattice-type steel-concrete composite stiffening frame is optimized by installing grouting steel pipes and steel-concrete composite extensions inside adjacent precast pier segments. The steel-concrete composite extensions are inserted into the corresponding grouting steel pipes, and UHPC grout is filled into the grouting steel pipes. This allows the lattice-type steel-concrete composite stiffening frame to share the load with the precast pier segments while reliably and effectively connecting adjacent precast pier segments into a whole, ensuring the overall performance of the precast pier segments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall elevation of this utility model;

[0022] Figure 2 This is a utility model Figure 1 Schematic diagram of AA section;

[0023] Figure 3This is a utility model Figure 1 A schematic diagram of the BB cross section. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-3 The present invention will be further described in detail below to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation thereof.

[0025] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] Example 1

[0028] As attached Figure 1-3 As shown in this embodiment, a precast hollow pier segmental connection structure with reinforced concrete tubular steel tubes includes at least two adjacent precast hollow pier segments 1. Each precast hollow pier segment 1 includes a precast concrete solid portion and a hollow layer 4. A lattice-type reinforced concrete tubular steel tube skeleton is pre-embedded in the concrete solid portion of the precast pier segment. The lattice-type reinforced concrete tubular steel tube skeleton includes concrete tubular steel tube column members 2 and steel web members 3. The concrete tubular steel tube column members 2 are composed of the steel tube column members and the concrete inside them. The concrete tubular steel tube column members 2 and the steel web members 3 are welded together as a whole. The steel web members 3 are obliquely connected to the concrete tubular steel tube column members 2.

[0029] In this precast hollow pier segment 1, a grouting steel pipe 5 is welded to the lower end of the steel-concrete composite column limb 2. The grouting steel pipe 5 has grouting holes and grout outlet holes. The upper end of the steel-concrete composite column limb 2 of another adjacent precast hollow pier segment 1 extends outward, forming a steel-concrete composite column limb extension section 6. This extension section 6 extends upward and is fixed inside the grouting steel pipe 5. Furthermore, a grouting layer 9 is provided at the joint surface at the upper end of this precast hollow pier segment 1.

[0030] Shear keys 8 are also provided on the steel-concrete composite column limb 2 of the extended section 6 of the steel-concrete composite column limb. UHPC grouting material 7 is injected between the grouting steel pipe 5, the steel-concrete composite column limb 2, and the shear keys 8. In this embodiment, the shear keys 8 are uniformly welded on the steel-concrete composite column limb 2.

[0031] In this embodiment, the yield strength of the steel in the steel-concrete composite column 2, the steel web members 3, and the grouting steel pipe 5 is not less than 345 MPa. The compressive strength of the UHPC grouting material 7 and the grouting layer 9 is not less than 120 MPa.

[0032] Example 2

[0033] The construction method of the segmental connection structure of the steel-concrete reinforced prefabricated hollow bridge pier in Embodiment 1 above includes the following steps:

[0034] S1. Fill the interior of the steel tube column with concrete and vibrate it accordingly to form a steel tube concrete column 2. Place the steel tube concrete column 2 in the designed position and weld it together with steel web members 3 to form a lattice-type steel tube concrete stiffening frame. Weld a grouting steel pipe 5 with grouting holes and grout outlet holes to the lower end of the steel tube concrete column 2 on one of the lattice-type steel tube concrete stiffening frame connection sides. Extend the steel tube concrete column 2 on the other side, i.e., the adjacent lower lattice-type steel tube concrete stiffening frame connection side, to form a steel tube concrete column extension section 6. Weld shear keys 8 on the steel tube concrete column 2 of the steel tube concrete column extension section 6 to enhance the friction and interlocking force between the steel tube concrete column extension section 6 and the UHPC grouting material 7.

[0035] S2. When making precast hollow pier segment 1, an inner membrane needs to be installed throughout the outer mold of the pier segment. At the same time, the lattice-type steel pipe concrete stiffening skeleton inside the precast hollow pier segment 1 is placed in the designed position in the precast pier segment template. Then, the pier segment concrete is poured and the pier concrete is cured to finally complete the production of the precast hollow pier segment.

[0036] S3. After the two adjacent precast hollow pier segments 1 are completed, the joint surfaces of their connecting ends are roughened, and a grouting layer 9 is set at the joint surface of the lower precast pier segment. Then, the steel-concrete composite column extension 6 of the lower precast hollow pier segment 1 is inserted into the designated position inside the grouting steel pipe 5 of the other upper precast hollow pier segment 1, and UHPC grouting material 7 is injected from the bottom grouting hole. After the grouting material 7 flows out from the top grouting hole, it is re-grouted after 30 minutes to ensure that the grouting material 7 fills the gap between the steel-concrete composite column extension 6 and the grouting steel pipe 5, thereby forming an effective anchorage for the steel-concrete composite column extension 6. Finally, the assembly and connection of the lattice-type steel-concrete composite reinforced precast hollow bridge pier segments are completed.

[0037] The above are merely preferred embodiments of this utility model and do not constitute any limitation on the structure of this utility model. The arrangement and quantity of this utility model are not limited to this example and can be optimized according to actual engineering conditions. Any modifications, equivalent changes, and decorations made to the above embodiments based on the technical principles of this utility model, without departing from the scope of the technical solution of this utility model, are still within the scope of the technical solution of this utility model.

Claims

1. A segmental connection structure for a steel-concrete reinforced prefabricated hollow bridge pier, characterized in that: It includes at least two adjacent precast hollow pier segments (1), each precast hollow pier segment (1) comprising a precast pier segment concrete solid part and a pier hollow layer (4), wherein a lattice-type steel-concrete composite stiffening skeleton is pre-embedded in the precast pier segment concrete solid part; the lattice-type steel-concrete composite stiffening skeleton comprises steel-concrete composite column members (2) and steel web members (3); Among them, a grouting steel pipe (5) is welded to the lower end of the steel-concrete column (2) of a precast hollow pier segment (1); the steel-concrete column (2) at the upper end of another adjacent precast hollow pier segment (1) extends outward, thereby forming a steel-concrete column extension section (6), which extends upward and is fixed inside the grouting steel pipe (5); Shear keys (8) are also provided on the steel-concrete composite column extension section (6) and UHPC grouting material (7) is injected between the grouting steel pipe (5), the steel-concrete composite column (2), and the shear keys (8).

2. The segmental connection structure of a steel-concrete reinforced prefabricated hollow bridge pier according to claim 1, characterized in that: The shear key (8) is uniformly welded onto the steel-concrete composite column (2).

3. The segmental connection structure of a steel-concrete reinforced prefabricated hollow bridge pier according to claim 1, characterized in that: The steel-concrete composite column (2) and the steel web member (3) are welded together as one unit.

4. The segmental connection structure of a steel-concrete reinforced prefabricated hollow bridge pier according to claim 3, characterized in that: The steel-concrete composite column (2) is composed of a steel-concrete composite column and the concrete inside it.

5. The segmental connection structure of a steel-concrete reinforced prefabricated hollow bridge pier according to claim 1, characterized in that: The grouting steel pipe (5) is provided with grouting holes and grout outlet holes.

6. The segmental connection structure of a steel-concrete reinforced prefabricated hollow bridge pier according to claim 5, characterized in that: A grouting layer (9) is also provided at the joint surface of the upper end of the other adjacent precast hollow pier segment (1).

7. The segmental connection structure of a steel-concrete reinforced prefabricated hollow bridge pier according to claim 6, characterized in that: The yield strength of the steel in the concrete-filled steel tube column (2), the steel web members (3), and the grouting steel pipe (5) shall not be less than 345 MPa.

8. The segmental connection structure of a steel-concrete reinforced prefabricated hollow bridge pier according to claim 7, characterized in that: The compressive strength of the UHPC grout (7) and the grouting layer (9) shall not be less than 120 MPa.

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