A prefabricated segmental assembly double-walled hollow bridge pier
By assembling prefabricated segmental double-walled hollow bridge piers, and using a nested structure of GFRP pipes and steel pipes and prestressed tendons, the problems of long construction cycle, large material consumption and insufficient durability of traditional bridge piers have been solved, achieving efficient and environmentally friendly bridge construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HOHAI UNIV
- Filing Date
- 2025-07-15
- Publication Date
- 2026-05-26
Smart Images
Figure CN224281007U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a prefabricated segmental assembly double-walled hollow bridge pier, and it relates to the field of bridge engineering. Background Technology
[0002] The traditional method of casting reinforced concrete bridge piers in place results in a lengthy construction period, high consumption of materials such as supports and formwork, and severe dust and noise pollution during construction, which is detrimental to environmental protection and sustainable development. Precast segmental assembled bridge piers have many advantages, such as shorter construction period, higher casting quality, and less susceptibility to seasonal and weather conditions, and are being used more and more widely in bridge engineering construction.
[0003] Furthermore, for some cross-sea bridges, especially high-pier, long-span bridges, the piers are usually designed as hollow thin-walled components to ensure structural ductility and reduce self-weight. Although the reinforced concrete hollow piers and double-steel-tube concrete hollow piers commonly used in current projects have good mechanical properties, their durability is still insufficient due to the susceptibility of steel bars and steel tubes to corrosion, resulting in high maintenance costs. Utility Model Content
[0004] This utility model provides a prefabricated segmental double-walled hollow bridge pier to solve the problem of insufficient durability of existing prefabricated segmental bridge piers in harsh service environments.
[0005] The present invention adopts the following technical solution.
[0006] The present invention relates to a prefabricated segmental double-walled hollow bridge pier, which includes prestressed anchorages, cap beams, double-walled hollow segments, foundations, and prestressed tendons.
[0007] The pier structure for supporting the cap beam is composed of multiple double-walled hollow segments assembled vertically along the axial direction.
[0008] The bottom of the double-walled hollow segment at the bottom of the pier structure is located on the foundation, and the cap beam is located at the top of the double-walled hollow segment at the top of the pier structure.
[0009] The cap beam and foundation are respectively equipped with prestressed anchorages; the prestressed tendons penetrate the double-walled hollow segments and are connected to the cap beam and foundation; the prestressed tendons and the prestressed anchorages work together to anchor the cap beam, pier structure and foundation to each other.
[0010] The prefabricated segmental double-walled hollow bridge pier of this utility model includes steel pipes and GFRP pipes as the double-walled hollow segments.
[0011] The steel pipe and GFRP pipe are arranged coaxially and nested, with the GFRP pipe being the outer pipe and the steel pipe being the inner pipe; the space between the steel pipe and the GFRP pipe is filled with concrete to form a double-walled hollow segment;
[0012] Located on both axial end faces of the double-walled hollow segment, one end face is provided with frustum-shaped shear keys arranged along the circumference, and the other end face is provided with circular shear key grooves arranged along the circumference.
[0013] The prefabricated segmental double-walled hollow bridge pier of this utility model has the same number and position of frustum-shaped shear keys on the axial end face of the double-walled hollow segment as the circular shear key groove.
[0014] The ratio of the diameter of the upper circular surface to the diameter of the bottom circular section of the frustum-shaped shear key is not less than 1 / 4 and not greater than 1; the frustum-shaped shear key is a frustum-shaped concrete shear key with a lower base radius greater than the upper base radius, and the lower base surface is integrated with the concrete interlayer between the steel pipe and the GFRP pipe; the lower base diameter of the frustum-shaped shear key is 1 / 4 to 3 / 4 of the thickness of the concrete interlayer between the steel pipe and the GFRP pipe.
[0015] The prefabricated segmental double-walled hollow bridge pier of this utility model has a GFRP pipe with a thickness of 1 / 50 of its own inner diameter, and the fibers inside the pipe are wound in the circumferential direction at an angle of ±80° with the vertical direction; the inner diameter of the steel pipe is 7 / 10 of the GFRP pipe, and the thickness of the steel pipe is 1 / 14 of the inner diameter.
[0016] The prefabricated segmental double-walled hollow bridge pier of this utility model has a hollow cross-section that is circular, rectangular, or elliptical.
[0017] The prefabricated segmental double-walled hollow bridge pier of this utility model uses fiber-reinforced composite material tendons or steel strands as prestressing tendons.
[0018] Beneficial effects
[0019] The prefabricated segmental double-walled hollow bridge pier provided by this utility model divides the pier body into several segments along the longitudinal direction for modular prefabrication. During construction, the prefabricated segments only need to be assembled and combined into a whole by tensioning prestressing tendons. This significantly reduces the on-site formwork, pouring and curing work, improves construction efficiency, shortens the construction cycle of the entire bridge pier, and is less affected by seasons and climate. It also reduces interference with existing traffic near the bridge site and reduces adverse impacts on surrounding residents and the ecological environment.
[0020] The prefabricated segmental double-walled hollow bridge pier provided by this utility model adopts a GFRP pipe-concrete-steel pipe double-walled hollow structure. GFRP pipe has the characteristics of being lightweight and high-strength, with a circumferential tensile strength of over 1000MPa and a density of only about 1 / 4 that of steel. This allows the structure to significantly save materials and reduce its own weight while maintaining high load-bearing capacity.
[0021] GFRP pipes possess both excellent mechanical properties and corrosion resistance, effectively protecting the internal concrete and steel pipes from the corrosive effects of harsh external environments, and significantly extending the service life of the structure. Attached Figure Description
[0022] Figure 1 This is an overall schematic diagram of the prefabricated segmental assembly double-walled hollow bridge pier of this utility model;
[0023] Figure 2 for Figure 1 Perspective view of prefabricated double-walled hollow segment 3;
[0024] Figure 3 for Figure 1 Schematic diagram of the cross-section of the double-walled hollow segment AA;
[0025] Figure 4 for Figure 1 Perspective view of Basic 10;
[0026] Figure 5 for Figure 1 Perspective view of the middle cover beam 2;
[0027] In the diagram: 1—Prestressed anchorage; 2—Cap beam; 3—Double-walled hollow segment; 4—Joint; 5—Prestressed tendon; 6—Steel pipe; 7—Frustum-shaped shear key; 8—Concrete; 9—GFRP pipe; 10—Foundation; 11—Circular shear key groove; 12—Prestressed tendon connection channel. Detailed Implementation
[0028] To make the objectives and technical solutions of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0029] like Figure 1 As shown in the figure, this example discloses a prefabricated segmental assembly double-walled hollow bridge pier.
[0030] The structure includes prestressed anchorage 1, cap beam 2, precast double-walled hollow segments 3, prestressed tendons 5, and foundation 10. The precast double-walled hollow segments 3 are connected sequentially from the foundation upwards. After reaching the predetermined height, the cap beam 2 is placed on top, and the foundation, each double-walled hollow segment, and the cap beam are connected by prestressed tendons 5. The structure is then anchored at the top using prestressed anchorage 1 to form an integral pier structure.
[0031] like Figure 2 , 3As shown, the precast double-walled hollow segment 3 is a GFRP pipe-concrete-steel pipe double-walled hollow structure. The outermost layer is a GFRP pipe 9, and the innermost layer is a steel pipe 6. Concrete is filled between the GFRP pipe 9 and the steel pipe 6. The thickness of the GFRP pipe 9 is 1 / 50 of its own inner diameter, and the fibers inside the pipe are wound circumferentially, forming an angle of ±80° with the vertical direction. The inner diameter of the steel pipe 6 is 7 / 10 of the GFRP pipe 9, and the thickness is 1 / 14 of its own inner diameter. It is made of Q345 steel with a yield strength of 345MPa. The concrete filling the space between the GFRP pipe 9 and the steel pipe 6 is grade C40.
[0032] like Figure 2 As shown, the top of the precast double-walled hollow segment 3 is provided with 6 frustum-shaped shear keys 7, which are evenly distributed on the top annular plane and are cast integrally with the lower concrete. The bottom surface of the frustum-shaped shear key 7 is connected to the interlayer concrete. The bottom diameter of the frustum-shaped shear key 7 is 3 / 4 of the thickness of the concrete interlayer, and the top diameter is 1 / 4 of the thickness of the concrete interlayer.
[0033] like Figure 3 As shown, the bottom of the prefabricated double-walled hollow segment 3 is provided with 6 circular shear key grooves 11, the positions of which are consistent with the positions of the shear keys arranged on the top of the segment.
[0034] like Figure 4 As shown, the foundation 10 is provided with a frustum-shaped shear key 7 and a prestressed tendon connection channel 12. The size and position of the frustum-shaped shear key 7 are consistent with the position of the double-walled hollow segment 3.
[0035] like Figure 5 As shown, the cap beam 2 has a pre-reserved circular shear key groove 11 and a prestressed tendon connection channel 12. The size and position of the frustum-shaped groove are consistent with those of the double-walled hollow segment 3.
[0036] Preferably, the hollow cross-section of the prefabricated double-walled hollow segment 3 can be circular, rectangular or elliptical, and the specific form is determined according to the engineering requirements.
[0037] Preferably, the prestressing tendon 5 can be made of fiber-reinforced composite material or steel strand.
[0038] This utility model also discloses a construction method for a prefabricated segmental double-walled hollow bridge pier containing prestressed tendons, comprising the following steps:
[0039] S1. Prefabricate the cap beam 2 and double-walled hollow segments 3 in the factory. Position the inner steel pipe 8 and the outer GFRP pipe 9, ensuring that the centers of their cross-sections coincide. Pour concrete inside to create the double-walled hollow segments. When fabricating the cap beam 2, reserve prestressed tendon connection channels 12 and circular shear key grooves 11 inside. After completing the prefabrication work, transport all the prefabricated components to the site.
[0040] S2. Construct foundation 10 on site, reserve prestressed tendon connection channel 12 and construct frustum-shaped shear key 7; prestressed tendon 5 passes through prestressed tendon channel 12 on foundation and is fixed in the reserved channel of foundation 10 by prestressed anchor 1.
[0041] S3. Assemble the double-walled hollow segment 3 and the cap beam 2 on site. Use the adhesive bonding method to assemble them sequentially from bottom to top.
[0042] S4. After passing the prestressed tendon 5 through the prestressed tendon channel 12 reserved in the cap beam 2, the prestressed tendon 5 is tensioned by post-tensioning and anchored in the cap beam 2 to form an integral structure.
[0043] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A prefabricated segmental assembly double-walled hollow bridge pier, characterized in that: It includes prestressed anchorage (1), cap beam (2), double-walled hollow segment (3), foundation (10), and prestressed tendons (5); The pier structure for supporting the cap beam (2) is formed by assembling multiple double-walled hollow segments (3) vertically along the axial direction; The bottom end of the double-walled hollow segment (3) at the bottom of the pier structure is arranged on the foundation (10), and the cap beam (2) is arranged at the top of the double-walled hollow segment (3) at the top of the pier structure. The cap beam (2) and foundation (10) are respectively provided with prestressed anchorages (1); the prestressed tendons (5) penetrate the double-walled hollow segment (3) and are connected to the cap beam (2) and foundation (10); the prestressed tendons (5) and the prestressed anchorages (1) work together to anchor the cap beam (2), pier structure and foundation (10) to each other.
2. The prefabricated segmental double-walled hollow bridge pier according to claim 1, characterized in that: The aforementioned double-walled hollow segment (3) includes a steel pipe (6) and a GFRP pipe (9); The steel pipe (6) and the GFRP pipe (9) are arranged coaxially and nested, with the GFRP pipe (9) being the outer pipe and the steel pipe (6) being the inner pipe; the space between the steel pipe (6) and the GFRP pipe (9) is filled with concrete to form a double-walled hollow segment (3); Located on both axial ends of the double-walled hollow segment (3), one end face is provided with a frustum-shaped shear key (7) arranged along the circumference, and the other end face is provided with a circular shear key groove (11) arranged along the circumference.
3. The fabricated precast segmentally assembled double-wall hollow pier bridge according to claim 2, characterized in that: The number and position of the frustum-shaped shear keys (7) on the axial end face of the double-walled hollow segment (3) are consistent with those of the circular shear key groove (11); The frustum-shaped shear key (7) is a frustum-shaped concrete shear key with a lower base radius greater than the upper base radius. The lower base is integrated with the concrete interlayer between the steel pipe (6) and the GFRP pipe (9). The bottom diameter of the frustum-shaped shear key (7) is 1 / 4 to 3 / 4 of the thickness of the concrete interlayer between the steel pipe (6) and the GFRP pipe (9).
4. The prefabricated segmental assembly double-walled hollow bridge pier according to claim 2, characterized in that: The thickness of the GFRP tube (9) is 1 / 50 of its inner diameter, and the fibers inside the tube are wound in the circumferential direction at an angle of ±80° with the vertical direction. The inner diameter of the steel pipe (6) is 7 / 10 of that of the GFRP pipe (9), and the thickness of the steel pipe (6) is 1 / 14 of the inner diameter.
5. The fabricated precast segmentally assembled double-wall hollow bridge pier according to claim 1, characterized in that: The hollow cross section of the double-walled hollow segment (3) is circular, rectangular or elliptical.
6. The prefabricated segmental double-walled hollow bridge pier according to claim 1, characterized in that: The prestressed tendon (5) is made of fiber-reinforced composite material or steel strand.