North approach bridge fortune telling

Introduction of Fuzhou Jinshan Bridge?

Fuzhou Jinshan Bridge is an important water passage connecting Fuzhou urban area and Cangshan District, connecting Shangpu Road in the urban area in the north and Jinshan Avenue, the main road in Cangshan District in the south. Jinshan Bridge was completed and opened to traffic in September 2000, which promoted the development of traffic and economy in Jinshan New District.

Brief introduction of bridge

Fuzhou Jinshan Bridge (Minjiang Sixth Bridge) is located in the west of Fuzhou, 3.32km away from Sanxianzhou Bridge. The bridge starts from Ye Highway (port) in the north, crosses Minjiang River (port) in the south along Xiangban Road, and connects Jinshan Avenue in Jinshan New District. The total length of the bridge is 1332m, in which the main bridge is 790m long, the maximum span of a single hole is 1 10m, and the general span is 40 ~ 60 m. The design standard of the bridge is the first-class urban trunk road. The foundation adopts bored pile, and the maximum bearing capacity of single pile is 18000KN. The complexity of municipal engineering survey is Grade II. 1998 In order to speed up the development of Jinshan District, Fuzhou Municipal Government decided to build Jinshan Bridge, which was completed and opened to traffic in September 2000.

Conditions and standards

Construction conditions

Jinshan Bridge is located 3250 meters upstream of Sanxianzhou Minjiang River Bridge, with its south bank connected to Jinshan Avenue, the main planning road of Jinshan New District, and its north bank connected to Gongye Road, the first-class main road in the city center. The main bridge is 790 meters long. The total width of the river bed at the bridge site is about 735 meters, and there is a Jiang Xinzhou at a distance of 0/60 meters from the north bank/KLOC, with a continental elevation of about 4 meters and a width of about 80 meters. The riverbed is an asymmetric W-shaped compound section, mainly in the south branch. The normal water level of the bridge site is 3. 95 meters, the maximum water depth of normal water level is about 6 meters. The bedrock is buried at a depth of 60-70 meters, and there is no fluctuation on the bedrock surface, so it is high-strength granite. Geophysical exploration shows that there is no fault zone at the bridge site. The site is flat, and the banks along the river are first-class terraces.

Road grade: Class I urban trunk road.

Design speed: 50 km/h

Design load: steam above -20, check with-120; The bicycle crowd load is calculated according to the Code for Design of Urban Bridges, and the pipeline load is1t/m. ..

Bridge width:19.5m.

Bridge design flood frequency: 1 /200

Navigation standard: according to the four-level inland waterway standard (2 ×500-ton segmented barge).

Interchange clearance: 4. 5 and 5 Jiang Bin Avenue. Julong Road is 0m.

Seismic intensity: check 7 degrees, fortification 8 degrees.

Related parameters

Jinshan Bridge, the total length of the bridge is1235m, of which the main bridge is 790m, and the north-south approach bridge is 245m and 200m respectively. The total width of the whole bridge is19.5m. ..

The main bridge adopts 7× 40m simply supported T-beam deck continuous +(60m+ 1 10m+60m) continuous rigid frame +7× 40m simply supported T-beam deck continuous. Crossing 1 10 meter long-span south branch canal.

The approach bridge spans Binjiang Avenue with beautiful environment in the old city and adopts 7× 35m prestressed concrete continuous box girder. The north approach bridge spans Pushang Road and Binjiang Avenue, with an entrance and exit interchange and a bicycle footbridge.

The south approach bridge spans Julong Road in Jinshan District, with 20m+35m+20m prestressed concrete continuous curved box girder and 5m× 25m prestressed T-beam. Jinshan Avenue and south approach bridge of Julong Road are provided with a half overpass.

The main bridge is located in a straight line, and the approach bridge is on the bend with R = 700 meters. The elevation of the highest point of the navigation hole of the main bridge is 19. 276, the longitudinal slopes on the north and south sides are 0.925% and 0 respectively. 93.5% respectively. The change point is set as a convex curve with R = 3500, and the longitudinal slope value of the north approach bridge is 2. 7%, the south approach bridge is 4.

According to the predicted traffic volume, in 2020, the traffic volume of Jinshan Bridge will be 4 1 1,000 vehicles/day, and the traffic volume of non-motor vehicles will be 26,000 vehicles/day. According to the engineering feasibility review opinion, the cross section of the bridge is designed as a four-lane mixed layout: 1.25m (sidewalk) +8.25m (mixed two-lane) +0.5m (median) +8.25m (mixed two-lane)+1.25m (sidewalk).

design feature

After the comparison and demonstration of different types of schemes with different spans in the engineering feasibility study stage and the preliminary design stage, the prestressed continuous rigid frame scheme of 60m+ 1 10m+60m is adopted. The key problems of continuous rigid frame bridge design are: reasonable section and temperature internal force. Therefore, the structural design has the following characteristics:

1. On the premise of ensuring the necessary rigidity of the structure, the beam height at the root of the main girder and the beam height-span ratio are set to 5.2m and 1/2 1, which is about118 compared with the indexes of similar bridges in China. The height-span ratio of the middle beam is 2.4m ... the volume is light and the technical index is advanced; Continuous rigid frame adopts three-dimensional prestressed single-box single-chamber cantilever structure, inclined web and large-tonnage prestressed system. Generally speaking, the reduction of prestressed pipeline area, the corresponding reduction of the thickness of box girder top and bottom plate and the number of sawtooth blocks is an effective way to reduce the weight of box girder and is also convenient for bridge construction.

2. Through many comparisons, the dimensions of continuous rigid frame pier and ordinary rigid frame pier are determined. The principle is to reduce its longitudinal stiffness as much as possible under the condition of satisfying the stress, so as to reduce its longitudinal push (pull) stiffness. Thereby reducing the foundation reaction caused by temperature and shrinkage and creep of beams. The key point of this scheme is that the flexibility of foundation must be considered in the design. The geological conditions of this bridge provide good conditions at this point. The construction drawing design increases the safety of pile foundation. On the premise of using six bored piles, the longitudinal flexibility of the foundation is considered. Through calculation and analysis, the foundation reaction caused by temperature and shrinkage and creep is not great, and the whole structure is well stressed.

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