Introduction

Softroom建筑公司和埃克斯利·奥卡拉汉结构工程师通过2006/7年度的RIBA设计竞赛赢得了彭宁顿道人行桥的委托，吸引了来自世界各地的150多人参赛。最近建成的这座桥取代了旧的工业结构，旨在成为该地区再生的重点，也是利兹-利物浦运河用户通往布特尔的门户。

Softroom Architects and Eckersley O’Callaghan structural engineers won the commission for the Pennington Road footbridge through an RIBA design competition in 2006/7 that attracted over 150 entries from around the world. Replacing an old industrial structure, the recently completed bridge is intended to act as a focus for the regeneration of the area and a gateway to Bootle for users of the Leeds-Liverpool canal.

 © Joseph Burns

约瑟夫·伯恩斯

桥梁与道路

The Bridge and Approaches

整体桥型遵循传统运河桥的类型，在这种桥型中，横冲直撞的侧道连接着一个简单的跨越或浅拱形桥梁结构。根据目前的可达性标准，陡峭的坡道已被一种更复杂的浅倾斜和阶梯式道路取代，缓缓弯曲的道路被切割成一种新形成的坚硬景观，就像小径蜿蜒向上爬上山坡一样。

The overall bridge form follows a typology of traditional canal bridges, where a ramped side approach links to a simple spanning or shallow arched bridge structure.  Updated for current standards of accessibility, the steep ramp has been replaced with a more complex shallow inclined and stepped approach, and gently curving approaches have been cut into a newly formed hard landscape, much as paths wind their way up a hillside slope.

 © Joseph Burns

约瑟夫·伯恩斯

桥梁结构

Bridge Structure

桥跨为19.4米，桥面宽度为2.4米。该结构是一对深，矩形，单曲，机械层合和简支硬木梁放置在栏杆区的桥梁，以减少结构的深度。这提供了一个视觉上不显眼和优雅的设计解决方案。悬臂式钢筋混凝土桥台跨越拖曳道，由多面混凝土原位混凝土墙支撑，这些墙又在灌注桩上支撑。斜坡结构为加筋土结构，位于桩支撑的加筋填土基础层上。

The bridge span is 19.4 metres with a deck width of 2.4 metres. The structure is a pair of deep, rectangular, singly curved, mechanically laminated and simply supported hardwood beams placed within the balustrade zone of the bridge in order to reduce the depth of the structure. This provides a visually unobtrusive and elegant design solution. Cantilevered reinforced concrete abutments span over the towpath, supported by faceted concrete in-situ concrete walls, these in turn supported on cast in-place piles. The ramp structure is of reinforced earth, sitting on a basal layer of reinforced fill supported by piles.

 © Joseph Burns

约瑟夫·伯恩斯

重要性与可持续性

Materiality and Sustainability

桥梁结构和饰面是用木材建造的，以创造一种触觉和温暖的感觉。可持续来源硬木的规格为设计提供了寿命和稳健性，并解决了对可持续建筑的关切。木材是机械层压钢钉和螺栓，避免使用粘合剂。混凝土工程采用粉煤灰作为水泥的一种更可持续的替代品，并采用加筋土工程技术来支撑弯道结构，以尽量减少使用额外混凝土的要求。

The bridge structure and finishes are constructed from timber to create a feeling of tactility and warmth. The specification of a sustainably sourced hardwood provides longevity and robustness to the design as well as addressing concerns about sustainable construction. The timber is mechanically laminated with steel dowels and bolts, avoiding the use of adhesives. The concrete works utilise a pulverised fuel ash as a more sustainable substitute to cement, and reinforced earth engineering techniques have been employed to support the curving ramp structure to minimise the requirement for using additional concrete.

Accessibility

这座桥的设计是完全可接近的，安全和愉快的使用，与温和慷慨的做法和水平门槛始终。该设计还提升了当地社区的社会景观感；通往西岸的阶梯和倾斜的道路，以及大桥和东面宽阔的宽度和欢迎性，为人们提供了居住、思考、休息和互动的场所。这种改善的环境，创造了强烈的地方意识，并赞扬了更广泛的城市重建的愿望，邻近的住房发展。

The bridge is designed to be fully accessible, safe and enjoyable to use by all with gentle generous approaches and level thresholds throughout. The design also promotes the sense of a social landscape for the local community; the stepped and inclined approach to the west bank and the generous width and welcoming materiality of the bridge and approach to the east offer places to dwell and ponder, rest and interact. This improved condition creates a strong sense of place, and compliments the wider urban renewal ambitions of the adjacent housing developments.