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Paleisbrug，是一座横跨铁路，长度达到250米的人行+自行车天桥公园，其联系了新开发区Paleiskwartier中的各个大学研究机构，办公室，住宅。同时桥体上还配备了大型的太阳能集热器以便为周边地区提供能源。天桥公园所在地斯海尔托亨博斯因为过去战争防御工程的建设，很长时间一直被壮丽的自然风景淹没，大量土地尚未开发，如今已成为濒临市区的景观与历史福地，人们上行到桥上可以饱览周边美景。

The Paleisbrug is a raised park and pedestrian and cycle bridge in one. The bridge forms a 250 metre-ling link across the railway track between the historic centre of ‘s-Hertogenbosch and Paleiskwartier. Paleiskwartier is a newly developed district that houses the court building, various universities of applied sciences, homes and offices. The new bridge has also been fitted with a large solar collector, which will supply the surrounding area with energy.

During the Eighty Year War, ‘s-Hertogenbosch was defended by having the surrounding landscape flooded (inundated). A lot of land is still not developed, which means ‘s-Hertogenbosch still borders onto an open green area, the Gement. The Gement is unique from both a historical and scenic point of view. Nowhere in the Netherlands will you find an area of natural beauty this close to a city centre. Because of the length of the bridge and the spectacular views across the Gement, a recreational area was created on the bridge. The park on the bridge is in line with the views, but also with greenery along the Dommel River and the recreational area around the Hofvijver in Paleiskwartier. By turning the bridge into a park-like area, more than 2,500 m2 of park has been added to the centre of ‘s-Hertogenbosch.

建筑师采用红锈色的耐候钢板作为主材料。耐候钢板除了成为结构，其还蔓延折叠翻转，成为了树池，地面，座椅，灯具。该材料抗腐蚀性能相当良好，每百年才会被腐蚀0.5毫米，可谓防风防雨的绝佳材料。同时其强劲的外形与场地防御工程背景不谋而合。

Weather-proof steel

Plants, trees, paving, furniture and lighting have been integrated in folded sheets of weather-proof steel. The rusty colour of this steel is characteristic for the Paleisbrug.
Weather-proof steel is a steel alloy with a dense corrosion layer, bringing the corrosion process to a virtual standstill. This means the metal can be left exposed. The weatherproof steel, which corrodes about 0.5 mm per 100 years, is 1 mm thicker in all places than would initially be required: after all, steel corrodes on two sides. As such, the bridge has a lifespan of at least 100 years. Furthermore, the robust appearance of the steel fits in well with the atmosphere created by the city’s fortifications.

乔木，灌木，地被在桥上按区域井井有条的分布，在桥两侧，主要种植着乔木，桥的横跨结构上则重要种植低矮植被。所有植物采用滴灌系统灌溉，同时设置溢流管防止水淹。夜间照明也保证了公园24小时舒适。这里成为了城市中一个有特色的生态系统。

为了让壳体在冬季不结冰，建筑师设置了太阳能集热器在夏天收集热量，在冬天释放出来，保证了行人经过桥面的安全，此外多余的热量还可供周边地区使用。

Plants and shrubs

The positions of the flower beds and tree containers on the bridge were determined in
collaboration with Piet Oudolf, who prepared the planting scheme for the Paleisbrug. The plants and shrubs on the bridge are divided into three zones, each with their own
character. On the side of the city centre, the bridge will have low, savannah-like plants and individual trees. Where the bridge crosses the railway track, there will only be low plants, in line with the extensive views. On the side of Paleiskwartier, the bridge will have more of a forest-like character. The new green creates a new eco system in the city centre, offering room for new flora and fauna.

A drip feed watering system with detection has been installed in the flower beds on the bridge. The discharge from the planters is fitted with an additional overflow pipe, so that the plants will never receive too much water. In the evenings, the plants, benches and paths are lit up by LED lighting, which means the bridge is a pleasant area even after sunset.

Solar collector

In order to be able to keep the bridge free from ice during the winter, floor heating with a low temperature was a departure point in the design. Road salt is not an option, as it would kill the plants and affect the material. That is why Benthem Crouwel looked for a sustainable solution for the use of floor heating. The answer is to have the Paleisbrug act as a giant solar collector during the summer. The floor heating/solar collector is connected to a heat/cold storage unit. During the summer, the bridge retrieves more heat from the bridge than is needed during the winter and supplies the surrounding district with energy.

Structure

The Paleisbrug is composed of various sizes of spans that run from column to column. The columns are covered in weather-proof steel panels, so that they form a whole with the spans. The spans comprise of horizontal weather-proof steel ducts covered a concrete compression layer. The longer the span, the higher the ducts. The largest span, measuring 60 metres in length, runs across the railway track. For this span, an additional trussed joint has been created on top of the bridge deck. A structure underneath the bridge deck was not possible in this place. The trains need such a large amount of headroom that the entire bridge would have had to be raised by a couple of metres.

The concrete compression layer is perforated in areas with trees. This has created a tree bed in the steel box girders. The perforations are placed strategically and lead to a good result, both for the planting scheme and the structure. The concrete is not visible anywhere on the bridge.

Four lanes, each two metres wide and alternately consisting of flower beds and paving, run across the length of the bridge. Strips, sixty centimetres wide and finished with a weatherproof steel studded sheet, run between the flower beds and paving. This where the cables, pipes and gutters for the rain water discharge from the street can be found. The setup of the bridge deck and pipework can be replaced, if necessary, without affective the main supporting structure.

FACTSHEET PALEISBRUG, ’S-HERTOGENBOSCH

CLIENT
Municipality of ’s-Hertogenbosch, Urban Development department

ARCHITECT
Benthem Crouwel Architects

LOCATION
‘s-Hertogenbosch, between the historic centre and Paleiskwartier

DIMENSIONS
Gross floor area: 2,500 m2
Length: 250 metres
Width: 10 metres
Height above railway track: 6.5 metres

MAIN MATERIALS
1,300 tons of weather-proof steel
Ceramic tiles
Plants, shrubs and trees

START DESIGN
2009

START CONSTRUCTION
2012

COMPLETION
Structural work: summer of 2014
Architectural finishing; 1 May 2015

OPENING
9 May 2015

PROJECT TEAM
Mels Crouwel, Job Schroën, Marleen van Driel, Moon Brader, Carel Weber, Volker Krenz, Sergio Bostdorp, Ronno Stegeman

CONTRACTOR STRUCTURAL WORK
Mobilis, Apeldoorn

CONTRACTOR ARCHITECTURAL FINISHING
Mobilis, Apeldoorn

CONTRACTORS STEEL STRUCTURE
Jos van den Bersselaar Constructie, Udenhout

STRUCTURAL ENGINEER
up to VO+: Arup, Amsterdam; then: Grontmij, Houten

INSTALLATION CONSULTANT
up to VO+: Arup, Amsterdam; then: Grontmij, Houten

LANDSCAPE ARCHITECT
Piet Oudolf, Hummelo

LIGHTING DESIGN
up to VO+: Arup, Amsterdam; then: Robert-Jan Vos Lichtontwerp en -advies, Hilversum

TES
Ennatuurlijk, ‘s-Hertogenbosch

GREEN SYSTEMS
Cobra boomadviseurs, Wilbertoord

RAIL MANAGEMENT
ProRail, Utrecht

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