CAJ | 학술논문

台湾中山高速公路于1978年完工通车后，成为台湾经济快速发展之重要交通动脉。近十余年来，由于都市人口的快速集中，来往台北都会区与邻近的桃园、新竹地区的交通量大增，使得中山高速公路北部路段饱和拥塞。鉴于此，对中山高速公路五股-杨梅段进行拓宽，以疏解台湾政经中心（台北）与科技中心（新竹）之间的交通，串连沿线科技产业聚落，畅通往返桃园国际机场的车流。五股-杨梅段拓宽工程系利用现有高速公路两侧兴建高架桥，途中行经林口路段属地质敏感坡地，仅能在高速公路单侧兴建高架桥，故需两度跨越高速公路，并在高速公路单侧兴建双层高架桥。由于跨越桥不得在现有高速公路上设置桥墩，故跨越桥主跨径达216cm，为目前台湾最大跨径之钢梁桥。而介于两座跨越桥间之单侧双层桥，采F形单柱式共构桥墩，造型特殊且工法创新。本工程系在狭窄的环境条件下施工，又必须维持现有高速公路的畅通，故大跨径跨越桥采用台湾首见的旋转工法，双层共构桥采用钢梁逐跨架设工法，此均为台湾难得一见的创新施工法。对五股-杨梅段拓宽工程作简要介绍外，拟对林口跨越桥及双层共构桥的设计与施工做出说明，供工程界同行参考。
태만중산고속공로우1978년완공통차후，성위태만경제쾌속발전지중요교통동맥。근십여년래，유우도시인구적쾌속집중，래왕태북도회구여린근적도완、신죽지구적교통량대증，사득중산고속공로북부로단포화옹새。감우차，대중산고속공로오고-양매단진행탁관，이소해태만정경중심（태북）여과기중심（신죽）지간적교통，천련연선과기산업취락，창통왕반도완국제궤장적차류。오고-양매단탁관공정계이용현유고속공로량측흥건고가교，도중행경림구로단속지질민감파지，부능재고속공로단측흥건고가교，고수량도과월고속공로，병재고속공로단측흥건쌍층고가교。유우과월교불득재현유고속공로상설치교돈，고과월교주과경체216cm，위목전태만최대과경지강량교。이개우량좌과월교간지단측쌍층교，채F형단주식공구교돈，조형특수차공법창신。본공정계재협착적배경조건하시공，우필수유지현유고속공로적창통，고대과경과월교채용태만수견적선전공법，쌍층공구교채용강량축과가설공법，차균위태만난득일견적창신시공법。대오고-양매단탁관공정작간요개소외，의대림구과월교급쌍층공구교적설계여시공주출설명，공공정계동행삼고。
After its completion and open to traffic in 1978, the Sun Yat-Sen Freeway has become a major transportation artery to service the fast economical development of Taiwan. Over the last decade, the rapid concentration of urban population and the dramatic growth of traffic between Taipei metropolitan and its neighboring areas, namely Taoyuan and Hsinchu, have caused considerable congestions. To solve this problem, the government took to widen the Wugu-Yangmei section of Sun Yat-Sen Freeway as a means to ease the traffic condition between the eco-political center of Taiwan (Taipei) and the technology center of the island (Hsinchu), to connect the technology industry clusters along the line and to maintain a smooth traffic flow to and from the Taoyuan International Airport. The widening project from Wugu to Yangmei was implemented by constructing elevated bridges along two sides of the freeway;however, the geological-ly sensitive slopes in the middle of the alignment at Linkou require the construction of bridges to be on one side of the freeway within this area. As a result, one direction of the traffic has to cross the freeway and join the traffic on the other side in the form of double deck bridge then divert to cross the freeway again to resume the original two-side configuration at the end of the geologically sensitive area. Because no piers are allowed to be constructed on the freeway below, the structure is designed to cross bridges with the main span as long as 216m. These are the longest steel girder bridges ever constructed in Taiwan. The double deck bridge in this section is supported by F-shaped eccentric single pier which is unique in design and innovative in construction method. This widening project was constructed with limited space and re-quired not to cause interruption to the traffic of the freeway. For this purpose, the long-span crossing bridge was built with the adoption of rotation method, and the double deck bridge was realized with span-by-span steel girder erection method. Both these two methods are first time to be found in Taiwan. Beside brief intro-duction to the widening works from Wugu to Yangmei, this paper intends to provide accounts of the design and construction of crossing bridges and the double deck bridge in Linkou as mentioned above, with the hope that it may serve as a useful reference to the peers in the engineering industry.