钢构彩虹桥 Rainbow Bridge / SPF: architects
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SPF: architects：SPF:a在2014年被選中在長灘會議中心和長灘表演藝術中心這兩個主要的長灘場所之間建立直接的、公共的聯繫。在大橋建造之前，要在兩個目的地之間移動，需要爬很多層樓梯，還要穿過一段以裝貨碼頭和暖通設備為主的海濱通道。最初提出的解決方案是在兩個中心之間修建一條高架人行道，但在對該市發出的詢價做出回應之後，人們更願意接受這個更完整的公共設施。
SPF: architects：SPF:a was chosen in 2014 for their proposal to create a direct, public connection between two major Long Beach venues: the Long Beach Convention Center and the Long Beach Performing Arts Center. Before the construction of the bridge, moving between the two destinations demanded climbing numerous flights of stairs and crossing a stretch of Seaside Way dominated by loading docks and HVAC equipment. The initial solution proposed was to build an elevated sidewalk between the two centers, but following an overwhelming response to the RFQ issued by the city a more complete public amenity was pursued.
該項目是一座壯觀的600英尺的人行大橋，由76根定制焊接的彎鋼肋構成頂部框架，約1200立方碼的現澆混凝土構成底座。這座橋的頂棚採用了3500個變色LED節點燈、100個落地燈和70個泛光燈，所有這些燈都可以通過編程和同步音樂來產生不同的效果。
The finished project is a spectacular 600-foot pedestrian bridge consisting of 76 custom-welded bent-steel ribs framing the top, and approximately 1,200 cubic yards of poured-in-place concrete shaping the base. The bridge canopy features 3,500 color-changing LED node lights, 100 down lights, and 70 floodlights, all of which can be programmed and synced to music to create different effects.
SPF:a與Carl Stahl Architektur密切合作，創建了定制的三件式不銹鋼節點夾，使橋樑的LED佈線可以連接到頂棚上。獨特的設計還可以方便安裝和更換的靈活性。人行道植物的植物和排水系統被隱藏在橋的混凝土脊梁中。
SPF:a worked closely with Carl Stahl Architektur to create the custom, three-piece, stainless steel node clip that allows for the bridge's LED wiring to attach to the canopy. The unique design also allows for ease of installation and replacement flexibility. Power and drainage for the walkway plantings have been hidden within the concrete spine of the bridge.
整個設計深受周圍海灘環境的影響(事實上，這座橋最初被稱為“激流”)。船體狀構造等結構元素與海浪的優雅和均勻結合在一起，而led則被固定在纜索上，傳達出一種網狀的感覺或船隻的索具。
The overall design is heavily influenced by its beach surroundings (the bridge was, in fact, first dubbed “Riptide”). Structural elements such as the hull-like formation have been married with the elegance and uniformity found in waves, while the LEDs were affixed to cables to convey a net-like feeling or the rigging of a ship.
然而，最終的形式受到預算限制和鄰近地塊開發的影響。 SPF:a通過簡化鋼結構的幾何形狀和修改橋樑的混凝土輪廓，使項目總成本降至1000萬美元。在建造之前，這座橋需要80根或更多獨特的混凝土肋梁。設計團隊能夠以這樣一種方式優化幾何形狀，即在重複放置時，僅一個具體形狀就可以實現類似的動態形式。
The final form was, however, influenced by budget constraints and the pending development of an adjacent lot. SPF:a brought the overall cost of the project down to $10 million by simplifying the steel geometry and modifying the concrete profile of the bridge. Prior to construction, the bridge called for 80 or more uniquely formed concrete rib beams. The design team was able to optimize the geometry in such a way that just one concrete shape could achieve a similar dynamic form when placed in repetition.
▼構築細節 Detail
項目名稱：彩虹橋
項目地點：加州長灘
竣工：2017年
尺寸：長度604英尺，橋面面積11500平方英尺
業主：長灘市
建築設計：SPF: architects
土木結構工程：Arup
景觀設計：Hood Design Studio
岩土工程：Geocon West, Inc
承包商：Powell總工程承包商
電氣分包商：Elecnor-Belco Electric
攝影：John Linden
Project Name: Rainbow Bridge
Project Location: Long Beach, CA
Completion Date: 2017
Size: Length 604 Feet, Bridge Deck Area: 11,500 SF
Owner: City of Long Beach
Architect: SPF: architects
Civil & Structural Engineer: Arup
Landscape Architect: Hood Design Studio
Geotechnical: Geocon West, Inc
Contractor: Powell General Engineering Contractor
Electrical Sub-Contractor: Elecnor-Belco Electric
Photography: John Linden
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