Beijing Urban Rd Document of bridge construction organization design
2.1.1 Project scale and construction significance * * Middle Street Interchange starts from Beihuqu West Road in the west and ends at Nanhuqu West Road in the east. The total length of the road is 1.4km. The nature of the road is urban trunk road, and the width of the red line is 40m. The scope of the project is located at the easternmost end of the planned Chengfu Road, and an interchange will be built at the intersection of Jingcheng Expressway. The implementation of this interchange will greatly improve the travel problem in Wangjing area. 2.1.2 Project environment (1) The construction face of the geographical environment project is divided into east and west parts by the existing Beijing Chengde Expressway and light rail. The west part of Beihuqu West Road to the north gate of Fucheng Garden is in the form of one road. The width of the motorway and non motorway is 9m, and the width of the pedestrian walkway is 4.5m. The traffic volume is small, and there are some municipal pipelines. There is no existing road from the north gate of Fucheng Garden to the design terminal Nanhuqu West Road, but there is an existing auxiliary road of Beijing Chengde Expressway on the east side of Beijing Chengde Expressway connecting with the existing * * Middle Street. The two-way road is 15m wide, which has an impact on the construction of some pipelines and ramps, so guidance must be considered during construction. A long-distance bus hub is planned on the southeast side of the interchange, which is a comprehensive transfer hub integrating urban railway, public transport, long-distance bus station and other passenger transport modes. The southwest is adjacent to Fucheng Garden, and the northwest is the land for Jiangzhuang Lake Park. There is a DN400 water supply pipe and a sewage pipe from Beihuqu West Road to the north gate of Fucheng Garden. Other pipelines are concentrated on both sides of the existing Beijing Chengde Expressway and the existing road from Jiangzhuanghu to * * Middle Street. Street light power is available along the west side of Beijing Chengde Expressway, and street light power, DN500 natural gas and DN1200 water supply are available along the east side. On both sides of Beijing Chengde Expressway and the existing road from Jiangzhuang Lake to * * Middle Street, there are 36 holes for telecommunications, street light power, natural gas and Sheung Shui. In addition, there are many municipal pipelines at the junction of the design starting point and end point with the current situation. The minimum clearance between the high-voltage line on the west side of Beijing Chengde Expressway and the planned main bridge is 4m, and the high-voltage line needs to be modified before construction. Some temporary houses on the east side of Beijing Chengde Expressway have not been demolished. 2.1.3 The project design shows that this interchange is a deformed clover leaf type full interchange. Ramp Z5 is a left turn ramp from east to south for vehicles in Wangjing area entering the urban area. Turning vehicles from south to west drive out of Beijing Chengde Expressway and turn left into Chengfu Road as Z1 ramp, which mainly solves the traffic pressure of the Fourth Ring Road and provides convenient conditions for vehicles entering the central area of the Olympic Games. The turning vehicle from north to east drives out from Jingcheng Expressway, passes the left turn ramp Z6 of Alfalfa Leaf, enters Chengfu Road, and turns. The turning vehicle from west to north drives out of Chengfu Road through Nanhuqu West Road, passes through Nanhuqu West Road, turns right along the road in the west of Nanhubei 2nd Street, and enters Beijing Chengde Expressway to turn. Ramps Z2, Z4 and Z7 are respectively right turn ramps in the east to north, north to west and west to south directions. The vehicles that turn right from south to east into Wangjing Community are realized along the road west of South Hubei Second Street. Add a road on the north side of the "long-distance bus hub", which is a bus lane. After the long-distance bus turns through the interchange, use the road on the north side of the long-distance bus hub to get in and out of the bus hub. There are continuous bicycle and pedestrian walkways on both sides of Chengfu Road. From west to east, they converge through Passage 1 and Passage 2. Under the existing reserved bridge, they cross Jingcheng Expressway and light rail. The underpass section is U-shaped. Pedestrians and bicycles are two-way. The bus stop is planned to be set on the west side of Beijing Chengde Expressway, and a pedestrian overpass will be built for pedestrian transfer. Two bicycle parking areas are set up to form a complete pedestrian and bicycle system. Make it convenient for passengers to transfer between the bus stops on Chengfu Road, Wangjing West Station of the urban railway and the planned long-distance bus hub. (1) Cross section design ① Standard cross section The red line of Chengfu Road in this section is 40m, and the cross section is: 3m (pedestrian walkway)+3m (non motor vehicle lane)+3.5m (green belt)+21m (motor vehicle lane)+3.5m (green belt)+3m (non motor vehicle lane)+3m (pedestrian walkway)=40m. ② The cross section of the main bridge across Beijing Chengde Expressway is 0.6m (guardrail)+14.75m (3 motorways plus collector distributor lanes)+0.5m (central strip)+14.75m (3 motorways plus collector distributor lanes)+0.6m (guardrail)=31.2m. ③ Bicycle and footpath under the bridge: 1m (footpath)+6m (non motorized lane)+1m (footpath)=8m. ④ Ramp: one-way single ramp: 0.75 m (earth shoulder)+7 m (motorway)+0.75 m (earth shoulder)=8.5 m one-way two lane ramp: 0.75 m (earth shoulder)+8 m (motorway)+0.75 m (earth shoulder)=9.5 m two-way two lane ramp: 0.75 m (earth shoulder)+10 m (motorway)+0.75 m (earth shoulder) =11.5m ⑵ Pavement structure ① Main road pavement structure combination: modified asphalt SMA-13 4cm medium grained asphalt concrete AC-20I 5cm coarse grained asphalt concrete AC-30I 7cm base lime fly ash gravel 16+16cm subbase lime fly ash gravel 18cm total thickness 66cm ② cross ramp and local road pavement structure fine grained asphalt concrete AC-13I 4cm coarse grained asphalt concrete AC-30I 7cm base Lime fly ash gravel 16+16cm subbase lime fly ash gravel 16cm total thickness 59cm ③ Highway pavement structure combination: modified asphalt horseshoe grease macadam mixture SMA-16 5cm coarse grained asphalt concrete AC-25I 6cm coarse grained asphalt concrete AC-30I 7cm base lime fly ash gravel 18+18cm subbase lime fly ash gravel 18cm total thickness 72cm ④ Non motor vehicle road surface knot Structure combination fine grain color asphalt concrete AC-13I 3cm medium grain asphalt concrete AC-25I 5cm base lime fly ash gravel 18cm subbase lime fly ash gravel 18cm total thickness 44cm ⑤ pedestrian walkway structure combination concrete square brick or blind road brick 5cm 1:3 cement mortar undercoat 2cm lime fly ash gravel mixture 15cm total thickness 22cm ⑶ The superstructure of the main bridge of the bridge project is: The 0-4 axis is (25.8+3 × 30) m prestressed concrete continuous box girder, the 4-7 axis is (48+55+48) m prestressed steel concrete composite box girder, the 7-10 axis is 3 × 25.8 m prestressed concrete continuous box girder, and the 10-13 axis is 3 × 30 m prestressed concrete continuous box girder. Double column capping beams are used for each half of the common piers of the substructure and the middle piers of the steel box girder. (Double column piers are used for each half of the non-public piers.) The pier diameters are 1.3m and 1.5m. Two pile caps with a diameter of 1.5m are set under the pier columns. The two caps are connected by tie beams; The middle pier of ramp part is rectangular pier. Four pile caps with a pile diameter of 1.2m are set under the pier columns. The abutment is column to cap beam abutment with pile foundation. Steel concrete composite box girder is adopted for the overpass, and the channel is cast-in-place closed frame. ⑷ There are two sewage works in this bidding: a new Ф 500 sewage pipeline is built from the north side of Fucheng Garden to Beihuqu West Road, and it is connected to Beihuqu West Road in the west; A Ф 400 sewage is embedded in the north road of the long-distance bus hub and connected to the sewage pipe of the proposed Nanhuqu West Road (5) The water flow direction of the west side of Beijing Chengde Expressway in the rainwater project is divided into two parts: most of the rainwater flows into the west side of the rainwater square ditch and along the west side of Beijing Chengde Expressway into the Beixiao River; Part of the rainwater crosses the expressway with the U-groove rainwater pipeline and part of the rainwater in the east enters the planned rainwater pump station, and is lifted to the east rainwater square ditch through the pump station. Other rainwater in the east of Beijing Chengde Expressway also collects into the W × H=2400 × 1600mm square ditch and enters the Beixiao River along the east of Beijing Chengde Expressway. (6) Information pipeline works The information pipeline works in this section include laying of 1400m telecommunication pipe blocks, 24 hole directly buried telecommunication steel pipes of 30m, and 24 manhole wells. 2.1.4 Engineering geological and hydrogeological conditions ⑴ The terrain and features along the line The road passes through the existing parks, golf courses, houses, expressways, light rail railways, etc. The terrain is basically flat. ⑵ Overview of stratum soil quality The surface layer is artificial fill layer (Qme), including house slag soil (A), low liquid limit clay fill (CL), and low liquid limit silt fill (ML). The artificially filled soil layer contains bricks, gravels, lime soil and ash slag. The artificially filled soil layer along the proposed road varies greatly, with a thickness of about 0.8-2.8m. The Quaternary proluvial filling layer (Qal+pl) is below the artificially filled soil layer of the road, including low liquid limit clay CL, low liquid limit silt ML, high liquid limit silt CH, locally containing fine-grained soil sand SF, silty soil sand SM. ⑶ Groundwater overview Geological data provided in the bidding document: the static groundwater level elevation in the plant area is 35.06-36.72m (buried depth 2.3-3.6m), and the groundwater type is platform phreatic water. The annual change of water level is generally as follows: the water level is high in June September and relatively low in other months, and the annual change range is generally 1-2m. The highest water level elevation of the plant in 1959 was close to the natural ground, and the highest groundwater level in recent 3-5 years was close to the natural ground in the southwest of the site area, and gradually decreased to 37.80 m in the northeast.
