CN102277830B - Cable stayed bridge and vibration-reducing auxiliary cable device for same - Google Patents
Cable stayed bridge and vibration-reducing auxiliary cable device for same Download PDFInfo
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Abstract
本发明涉及一种用于斜拉桥的减振辅助索装置及斜拉桥，该减振辅助索装置包括索扣、套箍、辅助索及锚具，索扣固连在各斜拉主索外部套筒上，套箍固定在索扣上，辅助索由预张拉的形状记忆合金制成，其穿过套箍，并串接在各斜拉主索之间，其一端固定在最长的斜拉主索上，另一端通过可调节锚具固定在斜拉桥的梁体上。由于辅助索由形状记忆合金制成，其具有形状记忆效应、超弹性等优良特性，增强了减振辅助索装置的耗能性能，在外力作用下产生较大变形时具有自恢复能力，同时具有良好的耐久性。辅助索串接在各斜拉主索之间，与斜拉主索形成一个索网结构体系，可以提升拉索振动频率和阻尼，有效抑制拉索在各种外界激励下所导致的振动。
The invention relates to a vibration-damping auxiliary cable device for a cable-stayed bridge and a cable-stayed bridge. The vibration-damping auxiliary cable device includes a cable buckle, a hoop, an auxiliary cable and an anchor. On the outer sleeve, the ferrule is fixed on the cable buckle, and the auxiliary cable is made of pre-tensioned shape memory alloy, which passes through the ferrule and is connected in series between the cable-stayed main cables, and one end is fixed on the longest The other end is fixed on the girder body of the cable-stayed bridge through an adjustable anchor. Since the auxiliary cable is made of shape memory alloy, it has excellent characteristics such as shape memory effect and superelasticity, which enhances the energy consumption performance of the vibration-absorbing auxiliary cable device, and has self-recovery ability when large deformation occurs under the action of external force, and has good durability. The auxiliary cables are connected in series between the cable-stayed main cables and form a cable network structure system with the cable-stayed main cables, which can increase the vibration frequency and damping of the cables, and effectively suppress the vibration caused by various external excitations of the cables.
Description
技术领域technical field
本发明属于桥梁工程技术领域，尤其涉及一种用于斜拉桥的减振辅助索装置及斜拉桥。The invention belongs to the technical field of bridge engineering, and in particular relates to a vibration-damping auxiliary cable device for a cable-stayed bridge and the cable-stayed bridge.
背景技术Background technique
斜拉桥是由承压的塔、受拉的索和承弯的梁体组合起来的一种结构体系；其具有桥塔形式多变、可悬臂施工和美观等优点。随着斜拉桥跨度的不断增大，斜拉索也变得越来越长。作为斜拉桥主要承重构件的斜拉索，具有柔性大、内阻尼低、固有频率分布广等特点，极易在风、风雨和梁塔支承端位移的激励下发生振动。A cable-stayed bridge is a structural system composed of pressure-bearing towers, tension-bearing cables and bending-bearing beams; it has the advantages of variable forms of bridge towers, cantilever construction and beautiful appearance. As the spans of cable-stayed bridges increase, the stay cables become longer and longer. As the main load-bearing components of cable-stayed bridges, cable-stayed cables have the characteristics of large flexibility, low internal damping, and wide distribution of natural frequencies.
经过大量的研究，国内外学者发现斜拉索的致振机理非常复杂；可根据激励源的不同把斜拉索的主要振动类型分为两种：一是由风或风雨共同作用引起斜拉索的振动；二是斜拉索支承端在梁塔位移作用下发生的振动。目前，抑制斜拉索振动的主要手段是被动控制，其主要措施包括：一为通过改变斜拉索表面形状以改变斜拉索的气动特性；二为在斜拉索近端部增设被动减振阻尼器。但是由于斜拉索被动减振阻尼器对于长拉索的振动控制仍受到限制，不少结构工程师提倡采用辅助索方法；这种方法的主要手段是将各主要斜拉索相互连接，这样带来的好处是：提高了斜拉索体系整体的刚度，提高了斜拉索各阶振型的广义质量，增加了斜拉索的机械阻尼和气动阻尼，斜拉索振动时各模态间相互耦合。After a lot of research, scholars at home and abroad have found that the vibration mechanism of the stay cable is very complicated; the main vibration types of the stay cable can be divided into two types according to the different excitation sources: one is caused by the combined action of wind or wind and rain. The second is the vibration of the supporting end of the cable stay under the action of the displacement of the beam tower. At present, the main means of suppressing the vibration of the stay cable is passive control, and its main measures include: one is to change the aerodynamic characteristics of the stay cable by changing the surface shape of the stay cable; damper. However, since the vibration control of long cables by the passive vibration damper of the cables is still limited, many structural engineers advocate the use of auxiliary cables; the main means of this method is to connect the main cables to each other, which brings The advantages are: the overall stiffness of the stay cable system is improved, the generalized quality of each mode of the stay cable is improved, the mechanical damping and aerodynamic damping of the stay cable are increased, and the modes are coupled to each other when the stay cable vibrates .
形状记忆合金是一种兼有感知和驱动功能的新型材料，它与传统材料的区别是具有形状记忆效应和大变形超弹性特性，高阻尼，耗能性能好，能够重复屈服而不产生永久变形，耐久性好等特点；随着研究的深入和成本的降低，研发用于斜拉桥的减振辅助索装置具有很大的潜力。Shape memory alloy is a new type of material with both sensing and driving functions. The difference between it and traditional materials is that it has shape memory effect and large deformation superelasticity, high damping, good energy dissipation performance, and can repeatedly yield without permanent deformation. , good durability and other characteristics; with the deepening of research and the reduction of cost, the research and development of vibration-absorbing auxiliary cable devices for cable-stayed bridges has great potential.
发明内容Contents of the invention
本发明所要解决的技术问题在于，提供一种耗能性能较佳、耐久性好的用于斜拉桥的减振辅助索装置。The technical problem to be solved by the present invention is to provide a vibration-damping auxiliary cable device for cable-stayed bridges with better energy dissipation performance and better durability.
本发明所要解决的另一个技术问题在于，提供一种斜拉桥，其具有减振性能和耐久性良好的索网结构体系。Another technical problem to be solved by the present invention is to provide a cable-stayed bridge, which has a cable-net structure system with good vibration damping performance and durability.
对于上述用于斜拉桥的减振辅助索装置，本发明是这样得以实现的，其包括索扣、套箍、辅助索及锚具，索扣固连在各斜拉主索外部套筒上，索扣呈圆筒状，其轴线方向与斜拉主索的长度方向平行，套箍固定在索扣上，并且沿着索扣的圆周方向延伸设置，辅助索由预张拉的形状记忆合金制成，其穿过套箍，并串接在各斜拉主索之间，其一端固定在最长的斜拉主索上，另一端通过可调节锚具固定在斜拉桥的梁体上，相邻的斜拉主索之间的辅助索为两股预张拉的形状记忆合金丝，两股形状记忆合金丝交叉设置于相邻的斜拉主索之间。For the above-mentioned vibration-damping auxiliary cable device for cable-stayed bridges, the present invention is realized in this way, which includes cable buckles, hoops, auxiliary cables and anchors, and the cable buckles are fixedly connected on the outer sleeves of each cable-stayed main cable , the cable buckle is cylindrical, and its axial direction is parallel to the length direction of the cable-stayed main cable. The ferrule is fixed on the cable buckle and extends along the circumferential direction of the cable buckle. It passes through the hoop and is connected in series between the cable-stayed main cables, one end of which is fixed on the longest cable-stayed main cable, and the other end is fixed on the girder body of the cable-stayed bridge through an adjustable anchor , the auxiliary cables between adjacent cable-stayed main cables are two pre-tensioned shape memory alloy wires, and the two strands of shape memory alloy wires are arranged crosswise between adjacent cable-stayed main cables.
进一步地，所述套箍上设有用于将辅助索锁紧于索扣上的锁紧螺帽。Further, the hoop is provided with a locking nut for locking the auxiliary cable to the cable buckle.
进一步地，所述可调节锚具包括固定在斜拉桥梁体上的U形连接件及锚头；锚头包括本体部及形成在本体部上的二安装耳，二安装耳套设在U形连接件上；辅助索的一端固定在本体部上。Further, the adjustable anchor includes a U-shaped connector fixed on the cable-stayed bridge body and an anchor head; the anchor head includes a body part and two mounting ears formed on the body part, and the two mounting ears are set on the U-shaped On the connector; one end of the auxiliary cable is fixed on the body part.
进一步地，所述可调节锚具进一步包括楔形夹片，本体部上设有用以安装辅助索的安装孔，楔形夹片安装在安装孔内，并将辅助索固定在安装孔内。Further, the adjustable anchor further includes a wedge-shaped clip, and an installation hole for installing an auxiliary cable is provided on the body part, and the wedge-shaped clip is installed in the installation hole and fixes the auxiliary cable in the installation hole.
进一步地，所述U形连接件包括两个臂部，且每个臂部上均形成有螺纹段；U形连接件的两个臂部穿过安装耳后，通过螺母将U形连接件与锚头组装在一起。Further, the U-shaped connector includes two arms, and each arm is formed with a threaded segment; after the two arms of the U-shaped connector pass through the mounting ears, the U-shaped connector and the U-shaped connector are connected by nuts. Anchor heads are assembled together.
进一步地，所述减振辅助索装置进一步包括固定在斜拉桥梁体上的锚板，锚板上设有用以安装U形连接件的凸环。Further, the vibration-damping auxiliary cable device further includes an anchor plate fixed on the cable-stayed bridge body, and the anchor plate is provided with a protruding ring for installing U-shaped connectors.
进一步地，所述辅助索由镍钛合金、铜基合金或者铁基合金制成。Further, the auxiliary cable is made of nickel-titanium alloy, copper-based alloy or iron-based alloy.
对于上述一种斜拉桥，本发明是这样得以实现的，其包括承压的塔、承弯的梁体及受拉的斜拉索，斜拉索连接在塔与梁体之间，所述斜拉桥还包括上述的减振辅助索装置。For above-mentioned a kind of cable-stayed bridge, the present invention is realized like this, and it comprises the tower of pressure bearing, the girder body of bending and the stay cable of tension, stay cable is connected between tower and girder body, and described cable stay The bridge also includes the aforementioned vibration-damping auxiliary cable device.
由于上述减振辅助索装置的辅助索由预张拉的形状记忆合金制成，其具有形状记忆效应、超弹性等优良特性，从而可增强减振辅助索装置的耗能性能，在外力作用下产生较大变形时具有自恢复能力，同时具有良好的耐久性。辅助索串接在各斜拉主索之间，与斜拉主索形成一个索网结构体系：一方面，形状记忆合金辅助索减小了斜拉主索的有效长度，从而提升了拉索的振动频率；另一方面，提升了拉索的振动阻尼，可有效抑制拉索在各种外界激励下所导致的振动。再者，上述减振辅助索装置还具有结构简单、施工和维护方便等优点。附图说明Since the auxiliary cable of the above-mentioned vibration-damping auxiliary cable device is made of pre-tensioned shape memory alloy, it has excellent characteristics such as shape memory effect and superelasticity, thereby enhancing the energy dissipation performance of the vibration-damping auxiliary cable device. It has self-recovery ability when large deformation occurs, and has good durability at the same time. The auxiliary cables are connected in series between the cable-stayed main cables, forming a cable network structure system with the cable-stayed main cables: on the one hand, the shape memory alloy auxiliary cables reduce the effective length of the cable-stayed main cables, thus improving the Vibration frequency; on the other hand, the vibration damping of the cable is improved, which can effectively suppress the vibration caused by the cable under various external excitations. Furthermore, the above-mentioned vibration-damping auxiliary cable device also has the advantages of simple structure, convenient construction and maintenance, and the like. Description of drawings
图1是本发明中斜拉桥一较佳实施例的示意图。Fig. 1 is a schematic diagram of a preferred embodiment of the cable-stayed bridge in the present invention.
图2是本发明中减振辅助索装置一较佳实施例的示意图。Fig. 2 is a schematic diagram of a preferred embodiment of the vibration-damping auxiliary cable device in the present invention.
图3是图2中索扣与套箍的示意图。FIG. 3 is a schematic diagram of the cable buckle and the ferrule in FIG. 2 .
图4是图3中索扣与套箍的侧视示意图。FIG. 4 is a schematic side view of the cable buckle and the ferrule in FIG. 3 .
图5是图3中索扣与套箍的仰视示意图。Fig. 5 is a schematic bottom view of the cable buckle and the ferrule in Fig. 3 .
图6是图1中可调节锚具的U形连接件的示意图。Fig. 6 is a schematic diagram of a U-shaped connector of the adjustable anchor in Fig. 1 .
图7是图1中可调节锚具的锚头的示意图。Fig. 7 is a schematic diagram of the anchor head of the adjustable anchor in Fig. 1 .
图8是图1中可调节锚具的楔形夹片的示意图。FIG. 8 is a schematic view of the wedge-shaped clip of the adjustable anchor in FIG. 1 .
具体实施方式Detailed ways
为了使本发明所要解决的技术问题、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
请参阅图1，是本发明中斜拉桥的一较佳实施例，该斜拉桥包括承压的塔1、承弯的梁体2、受拉的斜拉主索3及减振辅助索装置4。斜拉主索3连接在塔1与梁体2之间。Please refer to Fig. 1, it is a preferred embodiment of the cable-stayed bridge in the present invention, and this cable-stayed bridge comprises the tower 1 of pressure bearing, the girder body 2 of bending, the cable-stayed main cable 3 of tension and the auxiliary cable of vibration reduction device 4. The cable-stayed main cable 3 is connected between the tower 1 and the beam body 2 .
减振辅助索装置4包括索扣41、套箍42、预张拉的辅助索43、锚具44及锚固在梁体2上的锚板45。索扣41固连在各斜拉主索3外部套筒（图中未示出）上，其套设在斜拉主索3的外部，在两端与斜拉主索3端部锚固。套箍42固定在索扣41上。辅助索43由形状记忆合金制成，其穿过套箍42，并串接在各斜拉主索3之间，其一端固定在最长的斜拉主索3上，另一端通过锚具44及锚板45固定在斜拉桥的梁体2上。The vibration damping auxiliary cable device 4 includes a cable buckle 41 , a ferrule 42 , a pre-tensioned auxiliary cable 43 , an anchor 44 and an anchor plate 45 anchored on the beam body 2 . Cable buckle 41 is fixedly connected on each cable-stayed main cable 3 outer sleeve (not shown in the figure), and it is sleeved on the outside of cable-stayed main cable 3, anchors with cable-stayed main cable 3 ends at two ends. The hoop 42 is fixed on the cable buckle 41 . The auxiliary cable 43 is made of shape memory alloy, which passes through the ferrule 42 and is connected in series between the cable-stayed main cables 3, one end of which is fixed on the longest cable-stayed main cable 3, and the other end passes through the anchor 44 And the anchor plate 45 is fixed on the beam body 2 of the cable-stayed bridge.
具体地，请一同参阅图3至图5，每一索扣41大致呈圆筒状，可由两个半圆型结构411对接形成。在本实施例中，两个半圆型结构411为两个半圆型型钢，两个半圆型型钢通过螺栓412对接在一起，可将斜拉主索3外部套筒箍紧。其中，将索扣41安装在斜拉主索3上之后，索扣41的轴线方向与斜拉主索3的轴线方向或长度方向大致平行。换言之，索扣41与斜拉主索3平行设置。Specifically, please refer to FIG. 3 to FIG. 5 . Each cable buckle 41 is approximately cylindrical and can be formed by connecting two semicircular structures 411 . In this embodiment, the two semicircular structures 411 are two semicircular shaped steels, and the two semicircular shaped steels are butted together by bolts 412, which can tighten the outer sleeve of the cable-stayed main cable 3. Wherein, after the cable buckle 41 is installed on the cable-stayed main cable 3 , the axial direction of the cable button 41 is substantially parallel to the axial direction or the length direction of the cable-stayed main cable 3 . In other words, the cable buckle 41 is arranged parallel to the cable-stayed main cable 3 .
在每一索扣41上都对称固定有两个套箍42，于每一套箍42上分别设有锁紧螺帽421，以将辅助索43锁紧在索扣41上。在本实施例中，两个套箍42沿着索扣41的圆周方向延伸设置，换言之，索扣41的轴线方向与两个套箍42所在的平面大致垂直。这样设置，可保证穿过套箍42的辅助索43所处的平面与斜拉主索3之间相互垂直。Two hoops 42 are symmetrically fixed on each cable buckle 41 , and lock nuts 421 are respectively provided on each hoop 42 to lock the auxiliary cable 43 on the cable buckle 41 . In this embodiment, the two hoops 42 are extended along the circumferential direction of the cable buckle 41 , in other words, the axial direction of the cable buckle 41 is substantially perpendicular to the plane where the two hoops 42 are located. Such arrangement can ensure that the plane where the auxiliary cable 43 passing through the hoop 42 is located is perpendicular to the obliquely-stayed main cable 3 .
辅助索43可由镍钛合金、铜基合金或者铁基合金等形状记忆合金制成，其中优选镍钛诺合金。相邻的斜拉主索3之间的辅助索43为两股预张拉的形状记忆合金丝，两股形状记忆合金丝交叉设置于相邻的斜拉主索3之间。The auxiliary cable 43 can be made of shape memory alloys such as nickel-titanium alloy, copper-based alloy or iron-based alloy, among which nitinol alloy is preferred. The auxiliary cables 43 between adjacent cable-stayed main cables 3 are two pre-tensioned shape-memory alloy wires, and the two strands of shape-memory alloy wires are intersected between adjacent cable-stayed main cables 3 .
请一同参阅图6至图8，可调节锚具44包括U形连接件441、锚头442及楔形夹片443。其中，U形连接件441包括两个臂部4411，且每个臂部4411上均形成有螺纹段。锚头442包括一本体部4421及二安装耳4422。本体部4421上间隔设有二安装孔4423，用以安装固定楔形夹片443和辅助索43。二安装耳4422对称地设置在本体部4421的两侧，用于收容U形连接件441的两个臂部4411。U形连接件441的两个臂部4411穿过安装耳4422后，可通过螺母等将U形连接件441与锚头442组装在一起。楔形夹片443安装在安装孔4423内，用以将辅助索43固定在锚头442上。Please refer to FIGS. 6 to 8 together. The adjustable anchor 44 includes a U-shaped connector 441 , an anchor head 442 and a wedge clip 443 . Wherein, the U-shaped connecting piece 441 includes two arm portions 4411 , and each arm portion 4411 is formed with a threaded segment. The anchor head 442 includes a body portion 4421 and two mounting ears 4422 . The body part 4421 is provided with two mounting holes 4423 at intervals for mounting the wedge clip 443 and the auxiliary cable 43 . The two mounting ears 4422 are symmetrically disposed on two sides of the body portion 4421 for receiving the two arm portions 4411 of the U-shaped connector 441 . After the two arm portions 4411 of the U-shaped connector 441 pass through the mounting ears 4422 , the U-shaped connector 441 and the anchor head 442 can be assembled together by nuts or the like. The wedge clip 443 is installed in the installation hole 4423 for fixing the auxiliary cable 43 on the anchor head 442 .
锚板45用于将可调节锚具44固定在梁体2上，其上设有一凸环451，用以安装U形连接件441。在使用过程中，可先把锚板45锚固于梁体2上，再把U形连接件441穿过锚板45上的凸环451，然后装上锚头442，拧上螺母，将锚头442固定在U形连接件441上，接着穿过辅助索43，最后上楔形夹片443张拉辅助索43。The anchor plate 45 is used to fix the adjustable anchor 44 on the beam body 2 , and a protruding ring 451 is provided on it for installing the U-shaped connector 441 . During use, the anchor plate 45 can be anchored on the beam body 2 first, then the U-shaped connector 441 can be passed through the protruding ring 451 on the anchor plate 45, then the anchor head 442 can be installed, the nut can be screwed on, and the anchor head 442 is fixed on the U-shaped connector 441, then passes through the auxiliary cable 43, and finally the upper wedge clip 443 tensions the auxiliary cable 43.
在将减振辅助索装置4安装在斜拉桥上时，辅助索43安装顺序为从最上面的一条斜拉主索3开始安装，安装好第二条斜拉主索3时应当拉紧辅助索43，即要施加适当的预张力，然后通过锁紧螺帽421锁紧辅助索43，原则上应保证斜拉主索3振动时辅助索43始终处于受拉状态，最后通过可调节锚具44和锚板45锚固于梁体2上。When the vibration damping auxiliary cable device 4 is installed on the cable-stayed bridge, the installation sequence of the auxiliary cable 43 is to install from the top cable-stayed main cable 3, and the auxiliary cable 3 should be tightened when the second cable-stayed main cable 3 is installed. Appropriate pretension should be applied to the cable 43, and then the auxiliary cable 43 should be locked by the locking nut 421. 44 and the anchor plate 45 are anchored on the beam body 2.
由于上述减振辅助索装置4的辅助索43由预张拉的形状记忆合金制成，其具有形状记忆效应、超弹性等优良特性，从而可增强减振辅助索装置4的耗能性能，在外力作用下产生较大变形时具有自恢复能力，同时具有良好的耐久性。辅助索43串接在各斜拉主索3之间，与斜拉主索3形成一个索网结构体系：一方面，形状记忆合金辅助索43减小了斜拉主索3的有效长度，从而提升了拉索的振动频率；另一方面，提升了拉索的振动阻尼，可有效抑制拉索在各种外界激励下所导致的振动，如涡激振动、风雨振动、参数振动和线性内部共振。再者，上述减振辅助索装置4还具有结构简单、施工和维护方便等优点。此外，辅助索43交叉串接在各斜拉主索3之间，可进一步提高减振耗能效果。Since the auxiliary cable 43 of the above-mentioned vibration-damping auxiliary cable device 4 is made of a pre-tensioned shape memory alloy, it has excellent characteristics such as shape memory effect and superelasticity, thereby enhancing the energy dissipation performance of the vibration-damping auxiliary cable device 4. It has self-recovery ability when large deformation occurs under the action of external force, and has good durability at the same time. The auxiliary cables 43 are connected in series between the cable-stayed main cables 3, and form a cable network structure system with the cable-stayed main cables 3: on the one hand, the shape memory alloy auxiliary cables 43 reduce the effective length of the cable-stayed main cables 3, thereby The vibration frequency of the cable is improved; on the other hand, the vibration damping of the cable is improved, which can effectively suppress the vibration caused by various external excitations of the cable, such as vortex induced vibration, wind and rain vibration, parametric vibration and linear internal resonance . Furthermore, the above-mentioned vibration-damping auxiliary cable device 4 also has the advantages of simple structure, convenient construction and maintenance, and the like. In addition, the auxiliary cables 43 are cross-connected between the cable-stayed main cables 3, which can further improve the effect of vibration reduction and energy consumption.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.
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| EP2636795A1 (en) * | 2012-03-08 | 2013-09-11 | The European Union, represented by the European Commission | A method for protecting taut cables from vibrations |
| CN102776837B (en) * | 2012-08-13 | 2015-08-26 | 长安大学 | A kind of suspension cable vibration insulating system based on band damping lazy halyard |
| CN103103930B (en) * | 2013-02-01 | 2016-06-08 | 北京交通大学 | A Reinforcement Method for Lay Cables with Post-loaded Pre-tightening Force |
| CN103362064B (en) * | 2013-07-04 | 2015-02-18 | 江苏法尔胜缆索有限公司 | Auxiliary cable net system for vibration reduction of extra-large span bridge cables |
| CN105220615B (en) * | 2015-09-15 | 2017-07-11 | 同济大学 | A kind of vibration absorber for suppressing large-span suspension bridge suspension rod wind-induced vibration |
| CN105317006B (en) * | 2015-10-30 | 2017-01-18 | 深圳大学 | Cable bearing bridge and auxiliary cable monitoring and damping system thereof |
| CN112942105B (en) * | 2021-04-23 | 2022-08-05 | 湖南大学 | A suspension bridge suspension cable vibration reduction system |
| CN116856254A (en) * | 2023-07-26 | 2023-10-10 | 广东省公路建设有限公司 | Multi-tower cable-stayed bridge |
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