Design Drawing of 120m Ballast Deck Reinforced Concrete T Beam

2. Technical standard 1) Highway grade: Class IV highway; 2) Design speed: 20km/h; 3) Design load: highway - Class II 4) Design reference period: 100 years; 5) Design safety level: Level II; 6) Environment category: Class I; 7) Design flood frequency: 1/50. 8) The bridge deck is located in a straight section, with a flat longitudinal slope and a cross slope of 1%. 　　

2. Technical standard 1) Highway grade: Class IV highway; 2) Design speed: 20km/h; 3) Design load: highway - Class II 4) Design reference period: 100 years; 5) Design safety level: Level II; 6) Environment category: Class I; 7) Design flood frequency: 1/50. 8) The bridge deck is located in a straight section, with a flat longitudinal slope and a cross slope of 1%. 　　

2、 Standard scale: the bridge deck is 12.30 m wide, with sidewalks and green belts on both sides. The design load is 20 for steam and 100 for hanging. The bridge span (orthogonal to the river) is 6+8+6=20 m, the elevation of the middle span beam bottom is 5.70 m (GB 85, the same below), and the average thickness of the roadway pavement is 15 cm.

Technical standard: 1. Railway grade: Grade I 2. Line condition: single track 3. Design speed: 120km/h 4. Traction type: electric traction Bridge type: 1. Main truss type: Chengshi steel truss beam under the parallel chord triangle without vertical pole integral node, RPC ballast bridge deck. 2. Deck width: 8.6m for main truss and 5.02m for bridge deck. 3. Main truss: the calculation span is 156.0m, the total length is 158.0m, the truss height is 17m, the inter node length is 14.1m+9x14.2m+14.1m, and the center distance of the support in the transverse direction is 8.6m. 　　...... Pier structure: rectangular pier is adopted for the pier, with the top cap of 4.4m in longitudinal direction and 18m in transverse direction. The pier is 14m horizontally and 4m longitudinally. The cushion cap is 11m in the longitudinal direction, 14.6m in the transverse direction and 3m thick. The foundation is 12 1.5m pile foundations, with the pile spacing of 4.2m in the longitudinal direction and 4m in the transverse direction. 　　...... Designed in 2011, there are 5 CAD design drawings in total.

A medium bridge is located on a valley slope on the left bank of a river. Its center is a 1-25m T-beam bridge with a stake number of K2529+806.5. The foundation adopts 12 rows of piles with a diameter of 1.2 meters and a depth of 20 meters, and the abutment is light. As the clearance under the bridge is not high (4~5m), it is proposed to use bridge core filling as the prefabrication yard to prefabricate and install the upper T-beam.  

（2） The transverse distribution coefficient of vehicle load on the upper carriageway slab is calculated theoretically by the hinged slab beam method at the midspan, and the fulcrum is calculated by the lever method. The effect of angle on transverse distribution coefficient of skew plate is considered. （3） For the same span, slope and the same vehicle load level, the maximum transverse distribution coefficient value caused by different deck widths is taken as the control design value for the middle plate, and the transverse distribution coefficient value caused by different deck widths is taken as the control design value for the side plate. （4） Under the operation state, the slab beam is designed according to the structural stress of precast slab, hinge joint and 50mm thick cast-in-place integrated concrete layer. （5） Wide and deep hinged joints shall be used. Reinforcement shall be arranged in the hinged joints and bound with the protruding reinforcement of the precast slab. The protruding reinforcement of the adjacent slab shall be welded at the upper edge of the hinged joints to prevent cracks, water seepage and external climbing of the slab. （6） The top surface of precast slab shall be provided with U-shaped shear reinforcement, which shall be firmly fixed with the roof reinforcement during pouring. （7） Bridge deck pavement: divided into two layers, the lower layer is 100mm cast-in-place C40 waterproof concrete, and the upper layer is 100mm asphalt concrete. The corner reinforcement resisting the negative bending moment of the inclined plate is set in the cast-in-place waterproof concrete layer. 　　

2、 Standard scale: the bridge deck is 12.30 m wide, with sidewalks and green belts on both sides. The design load is 20 for steam and 100 for hanging. The bridge span (orthogonal to the river) is 6+8+6=20 m, the elevation of the middle span beam bottom is 5.70 m (GB 85, the same below), and the average thickness of the roadway pavement is 15 cm.

Key points of design: 1. The structural system in this general drawing is simple support first and then continuous bridge deck, which is designed according to partially prestressed Class A members. 2. The plane bar structure calculation software is used for design calculation, and the horizontal distribution coefficient is calculated by rigid beam method, and checked by space structure calculation software. 3. "10cm thick asphalt concrete bridge deck pavement"+"waterproof layer"+"10cm thick C40 concrete cast-in-place layer" shall be used for bridge deck pavement. 4. Design parameter ⑴ Concrete: gravity density γ=26.0kN/, elastic modulus EC=3.45 × MPa. ⑵ Asphalt concrete: gravity density γ=24.0kN/⑶ Prestressed reinforcement: elastic modulus Ep=1.95 × 105 MPa, relaxation rate ρ=0.035, relaxation coefficient ζ=0.3. (4) Anchorage: anchorage deformation and rebar retraction are calculated as 6mm (one end); Metal bellows friction coefficient μ=0.25, deviation coefficient k=0.0015. (5) Uneven settlement of bearing: Δ=5mm (6) Vertical gradient temperature effect: value shall be taken according to the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG D62-2004). ... 1 sheet in total.

Technical standard: span: 10m, 13m, 16m, 20m. Grade 15, 20 and super grade 20 for automobiles, Grade 80, 100 and 120 for trailers. 　　...... The drawings include: bridge cross section, bridge deck pavement, bridge deck continuous structure, sidewalk block structure, etc. 　　...... A total of 7 CAD design drawings are included.

Span: 10m; inclination: 0 °, 15 °, 30 °; load: highway - Class II bridge deck width: 8.5m, 10.0m, 12.0m; transverse distribution coefficient of vehicle load on upper carriageway slab; theoretical calculation of hinged slab beam method is adopted for midspan; lever method is adopted for fulcrum calculation. The effect of angle on transverse distribution coefficient of skew plate is considered. For the same span, slope and the same vehicle load level, the maximum value of transverse distribution coefficient in different deck widths is taken as the control design value. Under the operation state, the slab beam is designed according to the structural stress of precast slab, hinge joint and 50mm cast-in-place integrated concrete layer. Wide and deep hinged joints shall be used. Reinforcement shall be arranged in the hinged joints and bound with the protruding reinforcement of the precast slab. The protruding reinforcement of the adjacent slab shall be welded at the upper edge of the hinged joints to prevent cracks, water seepage and external climbing of the slab. Bridge deck pavement: divided into two layers, the lower layer is 100mm cast-in-place C40 concrete, and the upper layer is 100mm asphalt concrete. The corner reinforcement resisting the negative bending moment of the inclined plate is set in the cast-in-place concrete layer. 　　 　　

2. The upper part of this bridge adopts 1 × 10m prestressed concrete hollow slab, and the lower abutment adopts double column abutment and pile foundation. 3. The design load is Class II highway, and the seismic peak acceleration is 0.2g. 4. The bridge deck transverse slope of 1.5% is formed by the bridge deck pavement thickness of 100~153mm, and the bridge deck pavement is made of C40W6 concrete. 5. One GQF-C20 expansion joint is set at the abutment of this bridge, and GYZ175 × 42mm plate rubber bearings are used at the abutment, 24 in total. 6. The channel slope and bottom of the bridge are protected and built within 15m of the bridge, upstream and downstream respectively, using 400mmM7.5 mortar rubble+300mm gravel cushion.