| 摘要: | 根據中央地質調查所〔41 〕資料提供， 國道1 號北上里程約37k+400~39k+100處，屬於岩屑崩滑高敏感區域(Highly Sensitive Area of RockScrap Collapse and Slip)；而37k+600~37k+800 等處，則為土石流分布區段(Mudslide Distribution Area)；此2 處對高速公路的穩定性有直接威脅，不適宜擾動；另依據一般環評承諾(Environmental Assessment Commitment)〔40〕，道路橋梁若經過地質構造為不穩定區段(斷層、地震、地質災害區)，則應迴避並調整線型。又以不落墩於河床的原則下，配合立墩需求，採北上線與南下線帄面位置互換，故無新增用地及建物拆遷之問題，於是規畫為單柱上下層車道的高架橋梁，也成為五楊高架最具特色的橋樑。本研究以國道1號五股至楊梅段拓寬工程計畫第C903 標泰山林口段工程之大偏心單柱雙層高架橋之施工階段，對應永續公共工程指標施工階段之安全、創意、人文、耐久、減廢、節能、生態、效益，八項指標的符合度做比率分析。經分析，以橋梁全生命週期階段與公共工程指標評估結果，在可行性階段之適用性及評估結果為100%，規劃設計與施工階段符合度為86%，營運維護階段符合度為92%。另分析施工要徑各分項工程，鋼棧橋構台符合度為82%，擋土工法符合度為77%，SCC 材料適用性符合度為100%，橋墩形式符合度為66%，鋼箱梁符合度為90%，全跨徑吊裝符合度為87%，鋪面材料符合度為72%，下部結構為92%，上部結構為93%，尚符合永續公共工程之精神。顯見此大偏心單柱雙層橋梁在永續營建的推動上，經由13 項指標之評估，呈現永續發展的正向目標。According to the data furnished by the Central Geological Survey [41], thesection 37k+400~39k+100 along northbound Freeway No. 1 belongs to the HighlySensitive Area of Rock Scrap Collapse and Slip, whereas, the section at37k+600~37k+800 is part of the Mudslide Distribution Area. These two sections willpose a direct threat to the stability of the freeway and should not be disturbed. Further,a general Environment Assessment Commitment [40] also recommended that if thegeological construction of the bridge through which the road passes is part of anunstable section (fault, earthquake and geological disaster area), then the alignmentshould be adjusted and a detour created. Under the principle of not erecting piersalong the riverbed and in accordance with the pier-erecting requirements, an alternateexchange of the plain position will be implemented for the northbound andsouthbound lines. In this way, the problem of new land acquisition and buildingrelocation can be avoided. As such, it will be planned as a single-column elevatedbridge comprising double-layer traffic lanes and will become a unique feature of theWuyang Elevated Section.This research is focused on the construction of a large-eccentricsingle-column/double-layer elevated bridge at the Taishan-Linkou Section ofFreeway No. 1 Wugu-Yangmei Section Widening Project C903. Proportionalanalysis was conducted for identifying the compliance of the following eightindicators during the indicator construction stage of the sustainable public work, i.e.safety, creativity, culture, durability, waste reduction, energy conservation,eco-system and efficiency. After analysis, as shown by the entire bridge lift cyclestages and public work indicator evaluation result, it is learned that the applicabilityiiiand evaluation result for the feasibility stage is rated 100%; the conformity for theplanning, design and construction stages, 86%; and the conformity for the service andmaintenance stage, 92%.When analyzing the breakdown work at critical construction paths, the resultindicated that the conformity of the steel trestle platform is rated 82%; that of theretaining wall method, 77%; that for the applicability of SCC material, 100%; that ofpier type, 66%; that of steel girder, 90%; that of full-span lifting, 87%, that ofpavement material, 72%; that of the infrastructure, 92%; and that of the superstructure,93%. As a whole, the result meets the spirit of sustainable public works. Theevaluation result of the aforesaid thirteen indicators presents a positive trend inpromoting the sustainable operation of the large-eccentric single-column/double-layerbridge. |
