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无论白天黑夜，这座塔桥都是一个直击人心的壮观存在。

这个直径72米的圆环自行车交通天桥位于荷兰埃因霍温。其现代的设计，轻薄的体量和耀眼的灯光，如同飞蝶般，成为城市中让人振奋的交通新地标。

其位于城市的门户。附近房地产项目的发展导致原有道路不能满足交通需求，而地下的自行车交通道路和迂回的自行车线路都是政府不希望要的方案，最后，荷兰的桥梁专家ipv用一个漂亮的圆环斜拉桥方案，满足了所有要求。

桥由一个高70米的塔，24根钢索，一个圆环形的桥面组成。钢索均匀分布拉住桥面的内侧防止桥面受力不均，地上的M支撑结构也保证了桥面的稳定。

项目的挑战之一便是整合空间，现有的基础设施会影响链接桥体的坡道斜率，为此将壳体下方的路面降低了1.5米，保证桥体与自行车道相连的坡道有一个舒适的倾斜度。此外造型优美轻薄的桥也克服了许多结构和技术上的挑战。

该城市的风离谱灯光公司为桥量身设计夜晚照明效果，将其打造成为壮观的“城市之光”。其中一条光带分布在路面的下方内侧，形成强烈的环带照明效果。栏杆上装置的LED灯照亮路面，保证夜行骑行安全。

Circular cycle bridge ‘Hovenring’, Eindhoven, Netherlands

The spectacular circular cycle bridge in the Dutch city of Eindhoven has recently been opened to the public. The cable-stayed bridge, designed by ipv Delft, offers cyclists and pedestrians an exciting crossover. With its impressive pylon, 72 metre diameter, thin deck and conspicuous lighting, the cyclist roundabout is a new landmark for the city.

Like a flying saucer, the steel bridge hoovers above the Heerbaan/Meerenakkerweg intersection, its impressive pylon marking the entrance way to the cities of Eindhoven and Veldhoven. There used to be a level crossing here, but the development of a nearby housing estate meant the intersection needed changing in order to cope with growing traffic. As Eindhoven City Council refrains from cyclist underpasses and didn’t want a level crossing roundabout either, they asked Dutch bridge specialist ipv Delft to look at possible solutions. A circular cable-stayed bridge soon appeared to be the best option.

Structure

The bridge comprises a 70-metre high pylon, 24 steel cables and a circular bridge deck and is made out of steel. The cables are attached to the inner side of the bridge deck, right where the bridge deck connects to the circular counter weight. This way, torsion within the bridge deck is prevented. The M-shaped supports near the approach spans also ensure stability.

One of the challenges of the design process was the spacial integration. The existing infrastructure and buildings set the boundaries for the grades of the slopes leading up to the roundabout. As space was limited, it was decided to lower the ground level of the intersection underneath by a metre and a half, allowing for a comfortable slope for pedestrians and cyclists.

Tailor-made

The design and building process offered many technical challenges as well. Ilv Delft had a very clear view of what the bridge should look like: little more than a thin circular bridge deck and a powerfully shaped pylon. Amongst other things, this meant the standard way of attaching cables to the pylon wouldn’t suffice, as it would result in a bulk of steal near the pylon top. Therefore, a tailor-made solution was designed. The same applies to the M-shaped supports near the span bridges.

Lighting design

Befitting Eindhoven’s identity as the ‘City of Light’ (Eindhoven is home to the Philips company), ipv Delft also made a lighting design for the Hovenring. One of its main elements is integrated into the circular deck. The space in between counter weight and deck has been fitted with aluminum lamellas, translucent sheeting and tube lighting, which results in a clearly visible ring of light at night. Together with the illuminated pylon, the ring of light ensures the bridge’s spectacular appearance at night.

The functional lighting is integrated into the railing, where LED-lighting illuminates the bridge deck and ensures facial recognition of the bridge users at the same time. Lights attached to a cable framework in between pylon and bridge deck and to the inner surface of the circular counterweight illuminate the intersection underneath.

Both day and night, the pylon bridge is a true eye-catcher, spectacular in its simplicity.

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Hovenring, Circular Cycle Brigde by ipv Delft