Bridge of 9 Terraces / Scenic Structure Workplace
Textual content description supplied by the architects. The Horticultural Expo Village is positioned on the northern slope of Xian Mountain, which is within the northern a part of the eleventh Horticultural Expo Park, Nanjing. The terrain is excessive within the south and low within the north, the place the Scenic Structure Workplace designed the Northern Inn of VOCO B&B Lodge, a small shed within the northwest nook of the melon discipline, and a lined pedestrian bridge to the north of the village. This stretch of the Qixiang River flows alongside the northern foot of the Xian Mountain, and the east and west sides supply an ideal view of the valley within the course of Baohua Mountain and Zhong Mountain. The pedestrian bridge connects The Horticultural Expo Village and the Jumbo Museum to the north of it, making it straightforward for friends to return and go. Crossing the river from the north to the south, the Bridge of 9 Terraces is a strolling pathway into The village, with the Xian Mountain, Lian Mountain, and Yangshan Mine Pit unfolding in entrance of you behind the village. Along with assembly the circulation wants, we hope to construct a pedestrian bridge right here as a resting place and a landmark to the north of the village, in order that seeing the bridge offers folks a sense of “going house”.
Among the many present sorts of bridges, a lined bridge is a type of “gradual” bridge, with a lined construction that gives area for viewing, resting, and even market actions. There are a lot of examples of lined bridges everywhere in the world, in southern China, Europe, and North America. Most of them depend on substructures to help the higher pavilions, such because the inter-bearing wood pole arch bridge in Taishun, the Ponte di Rialto stone arch bridge in Venice, and the Chapel Bridge supported by steady piers in Lucerne, there are additionally bridges that mix of construction and area, such because the truss-like hall bridge in Madison County. In Nanjing Horticultural Expo Village, we tried to discover the suitable structural type for this bridge when it comes to the encompassing panorama and guests’ expertise.
The barge of the Qixiang River is of course sloped, and the width of the river varies between 18 and 30 meters because of the massive distinction in water degree between the considerable and dry durations. This makes the construction span as much as 37.8 meters on one hand, and alternatively, the bridge deck elevation must be maintained above the excessive water degree plus the secure peak for boat visitors on a regular basis. If the standard arch bridge type is used, an arch peak of at the very least 3 meters will make it troublesome to get on and off the bridge, and won’t clear up the accessibility wants; if the single-span extraordinary field girder is used, the underside construction thickness would attain almost 2 meters, which can be not pleasant to the strolling expertise, and can weaken the intimate scale of water viewing on the bridge throughout the dry interval; if the skinny rod arch or truss construction is used, the tall structural members could have a powerful industrial really feel, which might be onerous to coordinate with The village’s panorama –After a number of frequent structural varieties proved to be unsuitable, we as soon as once more discovered our technique to the standard dwelling type of the double-pitched roof.
In earlier works of the Scenic Structure Workplace, the folded plate as a roof construction can meet the big span of area and in addition may be associated to the spatial scale and type of conventional dwellings in Jiangnan Area. This time, we attempt to give extra vitality to the folded plate construction, overlaying the area whereas hanging the decrease pedestrian bridge terraces as the primary construction of the bridge.
This time, the folded plate is 2 double-sloped roof constructions, consisting of 4 inclined metal trusses, consisting of 500mm diameter higher and decrease chord metal pipes, inclined webs, and horizontal braces on the backside to type two triangular part spatial trusses. The central half gently arches to type a complete folded plate truss arch, and the 2 sides are then suspended by the truss to type eaves, which supplies flanging power for the folded plate and in addition shades the decrease area from the solar and rain. All the arch is clad with titanium zinc panels on the higher floor and wooden slats on the decrease floor. The shape composed of two frequent pitched roofs are small in part and harmonize with the roof of the homes within the village, however the hidden folded plate arch is powerful, finishing a 37.8m span with a 1.6m sagittal peak and sufficient power to droop the bridge terraces beneath.
The thought of the bridge area nonetheless comes from the small-scale village home, we divide the 8m vast and 36m lengthy bridge into 9 8m X 4.2m terraces, like 9 pavilions related collectively. Three of the 9 terraces had been raised and 5 had been lowered, connecting the upper south and decrease north barge elevations in an asymmetrical means. There may be solely a 300mm peak distinction between each two terraces, and the 50 mm-diameter rods, that are suspended from the underside of the folded plate truss arch, hold the terraces on the stacked half. The stacking solves the steadiness of the terraces and allows every terrace to have 6 hanging factors with solely 4m intervals between the hanging factors. The terraces thus get hold of a skinny structural thickness of 190mm and the gap between the bridge deck and the water is minimized. We laid accessible ramps between the terraces and hung bamboo curtains between the hanging rods to create a steady staggered, vaguely partitioned area beneath the bridge with 9 permeable cabins. The “power” nature of the bridge is amplified and interpreted right here. On the fringe of the terrace, the railings are barely angled and deflected within the airplane to keep away from the collision of handrails of two staggered terraces, and to information the physique and eyes in entrance of the view from the east and west.
The vertical load of the suspended terrace is remodeled into inner forces within the course of the arch by the folded plate truss arch to 2 ends, and the gravity and lateral thrust are transmitted to the inspiration on the barge by the bridgehead on the help factors at every finish. The bridgehead consists of a U-shaped concrete shear wall with comparable planer dimensions with every terrace. The cast-in-place concrete partitions with coarse-grained pebble combination in them and the home-sized window and door openings give the bridgehead a thick and rustic feeling. We prolonged the double-pitched roof of the bridge from the supporting bridgehead and overhung it, serving to to steadiness the arching forces of the primary construction with its personal weight on the one hand, and forming two bridgeheads “half-houses” along with the concrete shear partitions on the opposite. See the half home, undergo the small doorway in the home, one can then stroll as much as the lined bridge behind it.
Sitting on the bridge, the wood eaves shade sunshine, bamboo curtains filter mild, and the mountains and fields on each side of the river lengthen into the gap alongside the Qixiang River. Via the metaphor of the midway home on the bridgehead and the bodily and psychological leisure expertise of the hanging terraces, we give this bridge the imagery of homecoming and sightseeing by combining type and know-how.