A transversely eccentrically arranged tensioned cable reinforced bridge pier structure
By employing steel-concrete composite structures and tensioned cable reinforcement methods in the bridge piers, and utilizing struts and support bolts to share the pressure, the problems of complex construction and high cost of laterally eccentric bridge piers were solved, achieving efficient reinforcement and improved stability of the bridge piers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO ROAD & BRIDGE CONSTR GRP CO LTD
- Filing Date
- 2025-08-21
- Publication Date
- 2026-07-31
AI Technical Summary
The construction of transversely eccentric bridge piers in the existing technology is complex and costly, which leads to problems such as uneven stress, local stress concentration, fatigue damage and reduced bending performance of the bridge piers under large eccentric pressure.
The steel-concrete composite structure is adopted. By setting struts and tensioned cable reinforcement structures between the hollow steel pipes of the piers and the cantilever cap beams, the support screws are used to apply prestress to the steel cables, which distributes the pressure and increases the stiffness of the piers, simplifying the construction process.
It improved the overall rigidity and stability of the bridge piers, reduced construction complexity and cost, and increased construction efficiency.
Smart Images
Figure CN224578604U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of bridge structure systems, specifically relating to a tensioned cable-stayed bridge pier structure with a laterally eccentric arrangement. Background Technology
[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.
[0003] When the centerline of an elevated bridge does not coincide with the centerline of the median strip beneath it, or when the layout of the bridge piers is restricted by waterways, subways, pipelines, etc., laterally eccentric piers must be used. Although the laterally eccentric arrangement can meet the requirement of saving space below, the cantilever beams of the piers and the bridge deck facilities supported by the cantilever beams bring huge additional bending moments to the bridge piers, resulting in the piers being under large eccentric stress.
[0004] When a bridge pier is under large eccentric loading, firstly, due to the large eccentricity, the stress distribution across the pier section is extremely uneven, leading to localized stress concentrations that may cause material crushing or cracking. Secondly, the bending moment effect is significant, weakening the pier's bending resistance. The neutral axis shift reduces the area of the compression zone, increasing the risk of bending failure and thus decreasing overall stability, potentially leading to lateral deformation or even instability. Finally, stress concentration and uneven distribution exacerbate fatigue damage to the material, especially under cyclic loading, making cracks more likely and increasing the risk of steel reinforcement corrosion, further weakening the pier's load-bearing capacity and durability. The foundation is also affected by eccentric loading, leading to uneven settlement and the risk of overturning.
[0005] The prior art discloses a design for a transversely eccentric pier, which adopts an eccentric pier and an irregularly shaped cross section for the cap beam. In order to cope with the eccentric bending moment generated by the eccentric pressure state, both the pier and the cap beam on the upper side are made of Class A prestressed concrete components. The prestressing adopts low-relaxation high-strength steel strands, and tensioning is carried out on the side of the pier away from the cantilever and inside the cap beam.
[0006] The above-mentioned method of setting prestressed tendons requires binding the prestressed tendon ducts in the steel cages of the piers and cap beams, and also requires reserving tensioning ends and fixing ends. After pouring concrete and waiting for it to solidify, tensioning equipment must be installed on the top of the piers and both sides of the cap beams for tensioning. The construction is complicated and costly. Utility Model Content
[0007] In view of this, the purpose of this utility model is to provide a tensioned bridge pier structure with a transversely eccentric arrangement, which can solve the technical problems of complex construction and high construction cost in the existing technology of setting prestressed tendons in concrete.
[0008] To achieve the above objectives, the present invention adopts the following technical solution: A transversely eccentrically arranged tensioned cable-stayed reinforced bridge pier structure is provided, including a pile foundation, a pile cap fixed to the top of the pile foundation, a bridge pier fixed to the top of the pile cap, and the bridge superstructure installed on the top of the bridge pier; the bridge pier adopts a steel-concrete composite structure and is cast together with the pile cap. The bridge pier consists of hollow steel pipes and cantilever cap beams; the cantilever cap beams include connecting parts, with long arm sections and short arm sections connected to both sides of the connecting parts. The top end of the hollow steel pipe is fixedly connected to the bottom end of the connecting part, and a strut is installed between the hollow steel pipe and the long arm section; a tensioned wire reinforcement structure is installed on the hollow steel pipe on one side of the short arm section; the tensioned wire reinforcement structure includes a steel cable fixed between the top and bottom ends of the hollow steel pipe, and a support screw installed in the middle section of the hollow steel pipe; The support screw includes a connecting rod, one end of which is slotted to accommodate a steel cable, and the other end is rotatably connected to a rotating rod. The other end of the rotating rod is fixedly connected to a threaded rod. The threaded rod is threadedly connected to the middle section of the hollow steel pipe.
[0009] Preferably, multiple bolt holes are provided on the hollow steel pipe for connecting the support screw or strut; on both sides of the long arm section and the short arm section, corresponding first bolt holes and second bolt holes are provided in the middle section of the hollow steel pipe for threaded connection with the support screw.
[0010] Preferably, on the side where the long arm section is located, several third bolt holes are opened at the top of the hollow steel pipe, which are connected to one end of the strut by ordinary bolts.
[0011] Preferably, several fourth bolt holes are opened at the bottom of the end of the long arm segment away from the connecting part, and it is connected to the other end of the support rod by ordinary bolts.
[0012] Preferably, the strut includes multiple support rods, with both ends of the support rods fixed at an incline to the connecting plate, and the connecting plate is attached to the hollow steel pipe or long arm section.
[0013] Preferably, the connecting plate has a fifth bolt hole corresponding to the number and position of the third or fourth bolt hole. Ordinary bolts pass through the fifth bolt hole and are threaded to the third bolt hole, or pass through the fifth bolt hole and are threaded to the fourth bolt hole.
[0014] Preferably, the first bolt hole, the second bolt hole, the third bolt hole, and the fourth bolt hole are all bolt holes with internal threads.
[0015] Preferably, the length of the ordinary bolt is greater than the sum of the thickness of the connecting plate and the wall thickness of the long arm section or hollow steel pipe, so that a section of the ordinary bolt is anchored in the concrete of the pier.
[0016] Preferably, the hollow steel pipe has openings at both the top and bottom, and the cantilever cap beam pipe has openings at both the top and bottom, and concrete is poured from the opening at the top of the cantilever cap beam pipe.
[0017] Preferably, multiple pile foundations are evenly distributed on the bottom surface of the pile cap and are fixedly connected to the bottom surface of the pile cap; the center of the top surface of the pile cap is concentric with the center of the hollow steel pipe.
[0018] Compared with the prior art, the advantages and positive effects of this utility model are: This utility model utilizes a steel-concrete composite structure for the bridge pier. A strut is installed between the hollow steel pipe of the pier and the long arm of the cantilever cap beam. The strut supports the long arm, distributing the pressure and reducing the eccentric bending moment caused by the long arm. On one side of the short arm of the cantilever cap beam, a steel cable is fixed between the top and bottom of the hollow steel pipe, and a support bolt is installed in the middle of the hollow steel pipe. The support bolt supports the steel cable, applying prestress to increase the pier's stiffness. Combined with the strut support for the long arm, this enhances the overall stiffness and stability of the structure. This design solves the technical problems of existing technologies that require binding and positioning prestressing tendons in the steel cage of the cap beam and pier, and then installing tensioning equipment after concrete pouring and curing, which results in complex construction and high costs. This design offers the advantages of convenient and fast construction. Attached Figure Description
[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.
[0020] Figure 1 This is a three-dimensional schematic diagram of a tensioned cable-stayed bridge pier structure with a transversely eccentric arrangement according to an embodiment of this utility model; Figure 2 This is a three-dimensional schematic diagram of a bridge pier according to an embodiment of the present utility model; Figure 3 This is a three-dimensional schematic diagram of the cantilever cap beam pipe according to an embodiment of the present utility model; Figure 4 This is a three-dimensional schematic diagram of the hollow steel pipe according to an embodiment of the present utility model; Figure 5 This is a three-dimensional schematic diagram of the support screw according to an embodiment of the present utility model; Figure 6 This is a three-dimensional schematic diagram of the support rod according to an embodiment of the present utility model; In the picture: 1. Pile foundation; 2. Pier cap; 3. Pier; 31. Hollow steel pipe; 321. First bolt hole; 322. Second bolt hole; 33. Third bolt hole; 34. Cantilever cap beam pipe; 341. Fourth bolt hole; 35. Connecting part; 36. Long arm section; 37. Short arm section; 4. Tensioned cable reinforcement structure; 41. Support bolt; 411. Connecting rod; 412. Rotating rod; 413. Threaded rod; 42. Steel cable; 5. Support rod; 51. Connecting plate; 52. Support rod; 6. Bridge superstructure. Detailed Implementation
[0021] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0022] The present invention will now be described in detail with reference to the accompanying drawings.
[0023] This embodiment discloses a transversely eccentrically arranged tensioned cable-stayed bridge pier structure, such as... Figure 1 As shown, the structure includes a pile foundation 1, a pile cap 2 fixedly connected to the top of the pile foundation 1, a bridge pier 3 fixedly connected to the top of the pile cap 2, and a bridge superstructure 6 installed on the top of the bridge pier 3. Specifically, supports are provided on the top of the bridge pier 3 to support the bridge superstructure 6. The bridge pier 3 is a steel-concrete composite structure and is cast together with the pile cap 2. Using a steel-concrete composite structure to construct the bridge pier can fully utilize the high compressive strength of the steel-concrete composite structure. The steel pipe itself is both a load-bearing structure and an external formwork, and has the advantages of rapid industrialized installation and construction, resulting in convenient and fast construction. It also has good ductility and energy dissipation performance, which is beneficial for earthquake resistance.
[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the pier 3 includes a hollow steel pipe 31 and a cantilever cap beam pipe 34, the interior of which is used for pouring concrete; the cantilever cap beam pipe 34 is fixed to the top of the hollow steel pipe 31; specifically, the cantilever cap beam pipe 34 includes a connecting part 35, and the two sides of the connecting part 35 are connected to a long arm section 36 and a short arm section 37. It should be noted that the connecting part 35, the long arm section 36 and the short arm section 37 are made as a single piece to ensure the strength of the cantilever cap beam pipe 34.
[0025] like Figure 1 As shown, the top end of the hollow steel pipe 31 is fixedly connected to the bottom end of the connecting part 35 (which can be done by welding). A support rod 5 is provided between the hollow steel pipe 31 and the long arm section 36. The support rod 5 supports the long arm section 36, shares the pressure, and reduces the deformation of the long arm section 36.
[0026] like Figure 1As shown, a tensioned cable reinforcement structure 4 is installed on the hollow steel pipe 31 on one side of the short arm segment 37. The tensioned cable reinforcement structure 4 includes a steel cable 42 fixed between the top and bottom ends of the hollow steel pipe 31, and a support screw 41 installed in the middle section of the hollow steel pipe 31. The support screw 41 supports the steel cable 42, thereby applying prestress to the steel cable 42 and putting the steel cable 42 in a tensile state. Prestress is applied to the hollow steel pipe 31 from the short arm segment 37 side, thereby increasing the stiffness of the pier 3. Combined with the support of the strut 5 for the long arm segment 36, the overall stiffness and stability of the structure are improved.
[0027] like Figure 5 As shown, the support screw 41 includes a connecting rod 411. One end of the connecting rod 411 has a groove for accommodating the steel cable 42. The groove restricts the lateral movement of the steel cable 42, ensuring stability. The other end of the connecting rod 411 is rotatably connected to the rotating rod 412. The other end of the rotating rod 412 is fixedly connected to a threaded rod 413, which is threadedly connected to the middle section of the hollow steel pipe 31.
[0028] In this embodiment, the rotatable connection between the connecting rod 411 and the rotating rod 412 can be achieved by a bearing connection, wherein the connecting rod 411 is fixedly connected to the outer ring of the bearing, and the rotating rod 412 is fixedly connected to the inner ring of the bearing.
[0029] In this embodiment, the rotating rod 412 has a regular hexagonal cross-section, which facilitates its use with an industrial wrench or torque wrench. When the steel cable 42 is engaged in the groove of the connecting rod 411, the rotating rod 412 rotates, causing the threaded rod 413 to rotate relative to the hollow steel pipe 31. This causes the threaded rod 413 to move away from the hollow steel pipe 31, which in turn causes the connecting rod 411 to lift the middle section of the steel cable 42, applying prestress to the steel cable 42 and placing it in a tensile state. Prestress is applied to the hollow steel pipe 31 from the side of the short arm section 37, thereby increasing the rigidity of the pier 3. It can be understood that the prestress of the steel cable 42 can be adjusted by rotating the rotating rod 412. After adjustment, concrete is poured into the hollow steel pipe 31 to anchor the threaded rod 413 and prevent it from rotating.
[0030] It is understandable that the method of applying prestress in this embodiment, compared with the existing technology which requires binding and positioning prestressing tendon ducts in the steel cage of the cap beam and pier, and then installing tensioning equipment after pouring concrete and curing, can save construction time and cost, and make construction more convenient.
[0031] like Figure 1 , Figure 4 , Figure 6 As shown, the hollow steel pipe 31 has multiple bolt holes for connecting the support screw 41 or the strut 5. Specifically, as... Figure 6As shown, on both sides of the long arm segment 36 and the short arm segment 37, the middle section of the hollow steel pipe 31 has a first bolt hole 321 and a second bolt hole 322. The first bolt hole 321 and the second bolt hole 322 are bolt holes with internal threads, which can replace nuts and achieve threaded connection with the support screw 41 of the tensioned cable reinforcement structure 4. The positions of the first bolt hole 321 and the second bolt hole 322 are corresponding, on the same straight line, and their dimensions are the same as the thread specifications.
[0032] It should be noted that, along the length of the cantilever cap beam pipe 34, the cross-sectional length of the hollow steel pipe 31 is less than the length of the threaded rod 413, ensuring that the threaded rod 413 is threadedly connected to the hollow steel pipe 31. When the rotating rod 412 is rotated to move the threaded rod 413 away from the hollow steel pipe 31 and apply prestress to the steel cable 42, the threaded rod 413 has sufficient length to prevent the end of the threaded rod 413 away from the connecting rod 411 from falling out of the first bolt hole 321.
[0033] like Figure 1 , Figure 4 As shown, on the side where the long arm section 36 is located, several third bolt holes 33 are opened on the top of the hollow steel pipe 31, which are connected to one end of the support rod 5 by ordinary bolts; the third bolt holes 33 are also threaded bolt holes, and the threads in the holes can replace nuts and be threadedly connected with ordinary bolts.
[0034] like Figure 1 , Figure 5 As shown, several fourth bolt holes 341 are opened at the bottom of the end of the long arm section 36 away from the connecting part 35, and are connected to the other end of the support rod 5 by ordinary bolts; the fourth bolt holes 341 are also threaded bolt holes, and the threads in the holes can replace nuts and be threadedly connected to ordinary bolts.
[0035] like Figure 6 As shown, the strut 5 includes multiple support rods 52, which are arranged in parallel. Both ends of the support rods 52 are inclined and fixed on the connecting plate 51. The connecting plate 51 is in contact with the hollow steel pipe 31 or the long arm section 36 to ensure uniform force transmission.
[0036] like Figure 6 As shown, the connecting plate 51 has a fifth bolt hole corresponding to the number and position of the third bolt hole 33 or the fourth bolt hole 341. The fifth bolt hole is a plain round bolt hole without threads. The ordinary bolt passes through the fifth bolt hole and is threaded to the third bolt hole, or passes through the fifth bolt hole and is threaded to the fourth bolt hole; thereby connecting the two ends of the strut 5 to the long arm section 36 and the hollow steel pipe 31.
[0037] It should be noted that the length of the ordinary bolt is greater than the sum of the thickness of the connecting plate 51 and the wall thickness of the long arm section 36, or greater than the sum of the thickness of the connecting plate 51 and the wall thickness of the hollow steel pipe 31, so that after the ordinary bolt passes through the fifth bolt hole, the third bolt hole, or the fifth bolt hole and the fourth bolt hole, a section of the bolt can be located inside the pier 3 and anchored inside the pier 3 after the concrete is poured, thus strengthening the connection between the strut 5 and the long arm section 36 and the hollow steel pipe 31.
[0038] like Figure 2 , Figure 3 , Figure 4 As shown, the hollow steel pipe 31 has openings at both the top and bottom, the cantilever cap beam pipe 34 has openings at both the top and bottom, and the bottom opening of the connecting part 35 has the same shape and size as the top opening of the hollow steel pipe 31. The top of the hollow steel pipe 31 and the bottom of the connecting part 35 are welded and fixed together. Concrete is poured through the top opening of the cantilever cap beam pipe 34 to form the pier 3.
[0039] like Figure 1 As shown, multiple pile foundations 1 are evenly distributed on the bottom surface of the pier cap 2 and are fixedly connected to the bottom surface of the pier cap 2; the center of the top surface of the pier cap 2 is concentric with the center of the hollow steel pipe 31, thereby ensuring that the load of the superstructure can be evenly transferred to the pier cap 2 and pile foundations 1 through the pier 3, and ensuring the stability of the overall structure.
[0040] Working principle: If a bridge span is asymmetrical, piers are located asymmetrically, or the bridge deck load is unevenly distributed, the load application point on the pier will deviate from its lateral center. This eccentricity effect can lead to significant asymmetry in stress distribution on both sides of the pier. One side may experience greater compressive stress, while the other side may experience tensile stress or less compressive stress. Localized stress concentration may occur on the eccentrically loaded side, especially in areas close to the eccentricity. If the material strength is insufficient, localized crushing or cracking may occur, thus affecting the overall load-bearing capacity.
[0041] In this embodiment, a strut 5 is installed on the eccentrically compressed side of the pier 3 to support the long arm segment 36, share the pressure, and reduce the deformation of the long arm segment 36. On the tension side, a steel cable 42 and a support screw 41 are arranged. The support screw 41 can apply prestress to the steel cable 42, so that the steel cable 42 is in a tension state. Prestress is applied to the hollow steel pipe 31 from the short arm segment 37 side, thereby increasing the stiffness of the pier 3 and improving the stiffness and stability of the overall structure.
[0042] In one specific implementation, the construction steps for a laterally eccentrically arranged tensioned cable-stayed bridge pier structure are as follows: First, the construction of pile foundation 1 is carried out, followed by the formwork required for the construction of support platform 2, and the reinforcement cage is tied. The hollow steel pipe 31 was then hoisted to the designated position, and then welded to the steel cage of the foundation 2 for initial fixation. Next, the strut 5 is installed onto the hollow steel pipe 31 using ordinary bolts, and then the two ends of the steel cable 42 are welded to the top and bottom of the hollow steel pipe 31. Next, the cantilever cap beam pipe 34 is hoisted, and the cantilever cap beam pipe 34 and the hollow steel pipe 31 are connected by welding. The strut 5 is then connected to the cantilever cap beam pipe 34. Next, install the tensioned reinforcement structure 4; insert the steel cable 42 into the groove of the connecting rod 411, and thread the threaded rod 413 into the first bolt hole 321 and the second bolt hole 322; rotate the rotating rod 412 to apply a preload, so that the steel cable 42 is tightened; Next, concrete is poured from the top of the cantilever cap beam pipe 34 into the hollow steel pipe 31 and the foundation 2, and the concrete is vibrated and cured; after completion, the formwork of the foundation 2 is removed. Finally, the superstructure 6 of the bridge was hoisted in, completing the bridge construction.
[0043] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.
Claims
1. A transversely eccentrically arranged tensioned cable-stayed reinforced bridge pier structure, characterized in that, This includes pile foundations, a pile cap fixed to the top of the pile foundations, a bridge pier fixed to the top of the pile caps, and the bridge superstructure installed on the top of the bridge piers; the bridge piers are made of steel-concrete composite structures and are cast together with the pile caps. The bridge pier includes a hollow steel pipe and a cantilever cap beam pipe; the cantilever cap beam pipe includes a connecting part, with a long arm section and a short arm section connected to both sides of the connecting part. The top end of the hollow steel pipe is fixedly connected to the bottom end of the connecting part, and a support rod is set between the hollow steel pipe and the long arm section; a tensioned wire reinforcement structure is set on the hollow steel pipe on one side of the short arm section; the tensioned wire reinforcement structure includes a steel cable fixed between the top and bottom ends of the hollow steel pipe, and a support screw installed in the middle section of the hollow steel pipe; The supporting screw includes a connecting rod, one end of which is slotted to accommodate a steel cable, and the other end is rotatably connected to a rotating rod. The other end of the rotating rod is fixedly connected to a threaded rod. The threaded rod is threadedly connected to the middle section of a hollow steel pipe.
2. The transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 1, characterized in that, Multiple bolt holes are provided on the hollow steel pipe for connecting the support screw or strut; on both sides of the long arm section and the short arm section, corresponding first bolt holes and second bolt holes are provided in the middle section of the hollow steel pipe for threaded connection with the support screw.
3. The transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 2, characterized in that, On the side where the long arm section is located, several third bolt holes are opened at the top of the hollow steel pipe, which are connected to one end of the support rod by ordinary bolts.
4. The transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 3, characterized in that, Several fourth bolt holes are opened at the bottom of the long arm section away from the connecting part, and it is connected to the other end of the support rod by ordinary bolts.
5. A transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 4, characterized in that, The strut includes multiple support rods, both ends of which are fixed at an incline to a connecting plate, which is in contact with a hollow steel pipe or a long arm section.
6. A transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 5, characterized in that, The connecting plate has a fifth bolt hole corresponding to the number and position of the third or fourth bolt hole. The ordinary bolt passes through the fifth bolt hole and is threaded to the third bolt hole, or passes through the fifth bolt hole and is threaded to the fourth bolt hole.
7. A transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 6, characterized in that, The first bolt hole, the second bolt hole, the third bolt hole, and the fourth bolt hole are all bolt holes with internal threads.
8. A transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 6, characterized in that, The length of the ordinary bolt is greater than the sum of the thickness of the connecting plate and the wall thickness of the long arm section or hollow steel pipe, so that a section of the ordinary bolt is anchored in the concrete of the pier.
9. A transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 1, characterized in that, The hollow steel pipe has openings at the top and bottom, and the cantilever cap beam pipe has openings at the top and bottom. Concrete is poured from the opening at the top of the cantilever cap beam pipe.
10. A transversely eccentrically arranged tensioned cable-stayed bridge pier structure as described in claim 1, characterized in that, Multiple piles are evenly distributed on the bottom surface of the pile cap and are fixedly connected to the bottom surface of the pile cap; the center of the top surface of the pile cap is concentric with the center of the hollow steel pipe.