2、 Main technical standards Design load: automobile - Grade 20, trailer - 120. 2. Deck width: 2 × (net 10+2 × 0.5m anti-collision parapet). 3. Seismic fortification intensity: 8 degrees. 3、 Main materials 1 Concrete: 25 precast hollow slabs, 25 cast-in-situ pier column capping beams, 30 cast-in-situ piers, arch columns, transverse tie beams and cushion caps, 25 pile foundations, 25 anti-collision retaining walls, abutment caps and front walls above the bottom of abutment caps, 20 within 50cm of the top of abutment side walls, 20 abutment foundation, 40 precast arch boxes, transverse diaphragms, joints, caulking and cast-in-situ top plates. 2. Ordinary reinforcement: in accordance with the provisions of (GB1499-84), Grade II reinforcement shall be used if the diameter of reinforcement is greater than or equal to 12 mm, Grade I reinforcement shall be used if the diameter is less than 10 mm, and Grade I and II reinforcement shall be used if the diameter is equal to or equal to 10 mm. 3. Steel plate: ordinary structural steel conforming to GB700-79. 4. Steel pipes: high-frequency welded steel pipes are used. 5. Expansion joint: CD-60 expansion joint. See General Design Drawing of Expansion Joint, Anti collision Wall, Anti falling Net, Bridge Deck Pavement, Drain Pipe and Bearing. 6. Support: GYZF4 φ 200 × 51mm PTFE sliding plate circular plate rubber support is set at the expansion joint, and 2mm stainless steel plate is set below; GYZ φ 200 × 49mm circular plate rubber bearing is set in other places. 7. The bridge deck is paved with 4 cm fine grained asphalt concrete surface plus 10 cm C25 waterproof concrete. 8. The abutment body adopts 10 # mortar masonry 40 # block stone. 9. Drain pipe: it is arranged in the general drawing, with a distance of 3M. See the General Design Drawing of Expansion Joint, Anti collision Wall, Anti falling Net, Bridge Deck Pavement, Drain Pipe and Support. 10. Anti collision retaining wall: see General Design Drawing of Expansion Joint, Anti collision Wall, Anti falling Net, Bridge Deck Pavement, Drain Pipe and Bearing. 11. Abutment approach slab: see General Design Drawing of Abutment Approach Slab. 4、 Design key points 10 The uplink of this bridge is a reinforced concrete box arch bridge with a main arch clear span of 130 meters. The main arch ring is a normal arch with an oblique angle. The height difference between the two arch lines is 3.9 meters. The reinforced concrete hollow slab with an average span of 13 meters is used between the columns and the approach holes on the arch. CD-60 expansion joints are set at each abutment and 5 # and 6 # piers respectively, and the bridge deck is continuous at the top of the other piers. The internal force of the main arch ring is calculated once according to the full section of the final main arch ring, and the temperature change is calculated according to the arch ring closing temperature rising by 20 ℃ and falling by 22 ℃ (including concrete shrinkage). The main arch ring shall be reinforced according to the requirements of hoisting construction and structure. One main arch ring consists of six arch boxes. 11. The arch axis coefficient is 1.9, the rise span ratio is 1/5, the arch crown pre camber is 0.20m, and the lifting values at other locations are distributed according to the method of reducing the arch axis coefficient by half. 1. The plane of this bridge is located on the straight line, transition curve and circular curve with R=225m, LS=100m and LY=107.43M. The superelevation cross slope of the plane circular curve is 8%, and the circular curve is widened by 1.6M. 2. The longitudinal plane of this bridge is located in a concave curve with R=10000m and a down ramp with a gradient of - 3%. 3. The abutment abutment line and pier axis are arranged perpendicular to the center line of the road. The length of each precast slab and the cantilever length of the side slab are adjusted to meet the horizontal curve requirements. The beam shoe is set at the end of the precast slab to adjust the longitudinal and transverse slope of the route. The relative elevation difference of each slab shall be adjusted to meet the requirements of bridge deck cross slope. 4. Anti collision retaining walls are set on both sides of the upper and lower line bridges. The length set on the side close to the road centerline is the length of the bridge span. Steel pipes are not set on the wall top. The length set on the outside is the full bridge length, and steel pipes are set on the wall top. 5. The reinforcement of cast-in-place layer of bridge deck is arranged in the way of "steel bar for cast-in-place layer of bridge deck"? 8 The spacing of reinforcement mesh is 15x15cm. 6. The piers are solid equal section and variable section piers. Some pier foundations are supported on the main arch abutment and its backseat, and the rest are pile foundations. 7. Gravity U-shaped abutment is used to expand the foundation. 8. The main arch abutment adopts pile group foundation, and a backseat is set behind the cushion cap to resist horizontal thrust. 9. The coordinates of each point provided in the design drawing of this bridge are based on the point ZH (K447+452.59) as the origin. The tangent line of this point along the route direction is the positive direction of the X axis, and the normal direction pointing to the inside of the curve is the positive direction of the Y axis. 45 drawings in total
