坎·希利步行橋，格拉諾列爾斯，西班牙

建筑及工程設計：哈維爾·豐特，阿爾法北極星公司Architects and Engineers:Xavier Font,Alfa Polaris S.L.

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坎·希利步行橋，格拉諾列爾斯，西班牙

Can Gili Footbridge,Granollers,Spain,2010

建筑及工程設計：哈維爾·豐特，阿爾法北極星公司Architects and Engineers:Xavier Font,Alfa Polaris S.L.

1 實景/Bridge view

2 平面/Plan

3 步行橋底部/Bottom view of the bridge

BV-1432公路的路塹將兩側的居民區分隔開來，修建一座步行橋一直是居民的訴求。長期以來，人們想從一個居民區去往另一個的時候都不得不繞遠路。因此，2001年初，格拉諾列爾斯自治委員會委托阿爾法北極星公司，為這兩部分城市區域的新連接進行概念設計和細部設計。

路塹的不對稱橫截面對步行橋的設計方案產生了很大影響。這種不對稱主要指道路兩岸具有的不同標高，以及位于路塹南端的中部的一個小平臺，而設計正試圖強調這些不對稱要素。

我們還在尋求能夠降低生活成本和減輕環境負擔的辦法。這也是選擇耐候鋼、LED燈和聚合木材的原因：耐候鋼的生銹表皮保護它免受深層腐蝕，用于承重結構；LED燈的使用壽命長久并且節約能源，用于橋面照明；聚合木材所需維護成本極小，用于承重結構上方的橋面鋪設。

我們設計了一種曲柄狀的梁，具有變化的寬度和深度，跨距為32.7m，由兩段縱向的鋼制中空箱梁構成。步行道位于主體橫跨結構上，處于兩段箱梁之間，箱梁則在底部翼緣處通過橫梁相連。

V字形曲柄狀主梁位于北側基礎之上，設立于前文提到的小平臺上，其末端支撐起跨度為13.9m的甲板。鑒于那里糟糕的土地條件，此種形式避免了在路塹南端的上方建設基礎。

此項目中，鋼材使得設計方案中的雕塑般造型得以輕易實現。此外，高強重比使結構變得很輕，以此節省了橋基的建造成本。鋼材的使用允許在加工廠受限的環境下制造橋面——人行橋的基礎、橋墩、橋肩為現場澆筑，鋼結構為預制。這些均提高了生產質量并且加快了施工過程。

橋面上的路燈為12盞LED燈，由固定在主體結構內側網面的耐候鋼支撐，保護其免受破壞。帶有不銹鋼桿件的燈柱也被安裝在兩側上橋處。 （辛夢瑤 譯）

The construction of this footbridge is an old claim of the inhabitants of the two neighbourhoods separated from one another by the trench of the BV-1432 road.So far,people from one neighbourhood wanting to go to the other one had to make a detour.For this reason,at the beginning of 2001 the Granollers Borough Council commissioned Alfa Polaris to carry out the concept design and the detailing document of a new link between these two urban areas.

The design of the proposed footbridge was strongly conditioned by the asymmetric shape of the cross section of the road trench.We looked for a design that would highlight this asymmetry marked by the different levels of the two banks and the presence of a small platform in the middle of the south cutting of the trench.

We looked for a solution with reduced whole life cost and environmental burdens.This is the reason why we chose Corten steel–whose rusted skin protects itself from further corrosion–for the structure,LED lamps –with long life span and energy efficiency–for the street lighting over the deck,and polymeric timber–with almost no maintenance–for the decking over the structure.

We proposed a cranked shape beam,varying in width and in depth,spanning 32.7 metres,formed by two steel longitudinal hollow box girders.Over the main span the footpath is channelled by these two box girders which are linked together at bottom flanges by transversal beams.

Over the north foundation,placed on the mentioned platform,the main cranked beam takes a V shape,the top ends of which give support to a small deck that spans 13.9 metres.Doing this way,we avoided to build a foundation on the top of the south cutting of the trench,which had very bad ground conditions.

In this project,steel allowed us to easily achieve the sculptural forms the proposed design required.Moreover,its high strength-to-weight ratio resulted in a very light structure and the consequent savings for the foundations.Using steel for the deck permitted us to manufacture the deck in the controlled environment of the fabrication workshop,so that,meanwhile the foundations,the piers and the abutments of the footbridge were made on site,the steel structure was being fabricated.This helped us to increase the quality of the product and speed up the construction process.

On the deck the street lighting is provided by means of twelve LED lamps,supported and protected from vandalism by means of Corten steel shelters fixed to the inner webs of the main structure.Additional lamp columns,with stainless steel stems,were installed on both approaches.

4 實景/Bridge view

項目信息/Credits and Data

客戶/Client:格拉諾列爾斯自治市議會/Granollers Borough Council

結構設計/Structural Engineering:Xavier Font,Alfa Polaris S.L.道路照明工程/Street Lighting Engineering:GESA Gestió d'enginyeria,serveis i arquitectura

現場監理/Site Supervision:Alfa Polaris,S.L.

總承建商/Main Contractor:ACSA,Obras e Infraestructuras,S.A.

鋼結構承建商/Steel Contractor:Talleres Plain,S.A.

造價（含上橋處）/Cost(including approaches):€574,400建造時間/Comstruction Period:2009-2010

類型/Typology:40m長連續曲柄狀結構，主體跨度32.7m，橋面寬度1.95m/40m long continuous cranked structure with a main span of 32.7m.Deck width 1.95m.

主要材料/Main Materials:橋面/Deck:耐候鋼/Corten steel;橋肩/Abutments:鋼筋混凝土/reinforced concrete; 橋面

LED支撐/LED lamp supports on the deck:耐候鋼/Corten steel; 上橋處燈柱/Lamp columns on the approaches:不銹鋼/stainless steel; 扶手/Handrails:不銹鋼和漆面鋼/ stainless steel and painted steel; 垃圾箱（街道設施）/ Litter bins(street furniture):鍍鋅鋼和漆面鋼/galvanized steel and painted steel; 橋面鋪地/Deck paving:聚合木材/ polymeric timber

攝影/Photos:Xavier Font

評論

劉晨：“一橋飛架南北，天塹變通途”。用長江大橋的氣勢來形容西班牙小鎮這座步行橋，是夸張了些，路溝本非天塹，看上去也不是不可逾越，但若沒有它，溝兩畔的居民要么老死不相往來，要么就得“迢迢暗渡”。我在想，修這橋之前，溝南的小伙伴若是去找溝北的小伙伴玩耍，是不是直接翻溝過去了？溝南溝北的老朋友出門彼此瞧見了，想聊個天是打手語還是咆哮？看來距離與深淺無關，溝塹與水一樣，皆令人遠，它們異口同聲地說：“要有橋！”于是就有了橋。它驕傲地騰挪著耐候鋼的軀干，似乎告訴人們它本來就在這里，并且一直都在。

張昕楠：非對稱的和諧

坎·希利步行橋是一個看似簡單卻敏感回應了場地條件的設計。其結構采用了變截面空心箱梁的建構方式，使整體呈現出強烈的體量雕塑感。因橋兩側的場地和地質差異，該橋在剖面、平面的設計和建構處理上，表現出非對稱的理性和諧。結構的形式也將河渠斷面的梯形轉譯為兩個三角形的受力體系，并將剛性更強的封閉三角形結構置于北側，以減輕北側橋基對駁岸基礎帶來的壓力。結構形式的轉換也帶來了空間的微妙變化，增強了南側橋體空間的圍合感。

5　剖面/Section

Comments

LIU Chen :On first look,the road trench is not so impossible; a trench is not an abyss,after all.But without the footbridge,the inhabitants on one side of the trench would either take a long detour to reach the opposite side,or never communicate with one another.It would be curious to know whether the boys from the south neighborhood would cut through the trench straight to play with boys on the other side.Would someone from the north neighborhood greet their old friends on the opposite side in gesture language,or shout out at each other across the trench? River or trench,the distance is there to obstruct communications."Let there be bridge",so there is a bridge.Its Corten-steel structure leaps over the trench proudly,as if to proclaim its lasting existence.

6.7　夜景/Night views

ZHANG Xinnan:the Harmony of Asymmetric

Though seemingly simple,the Can Gili footbridge is a design that sensitively responds to the site condition.The sculptural volume of the footbridge results from its steel longitudinal hollow box girders.Because of the geological differences on either side of the bridge,the design shows an asymmetric yet rational harmony.The form of the structure translates the trapezoidal section of the trench into two triangular mechanical systems,and places the more rigid,closed triangular structure in the north,so as to reduce the pressure on the north bridge foundation.Meanwhile,the structural transformation also brought about subtle spatial changes and enhanced the sense of spatial enclosure to the south of the bridge.