Detail Design of Reinforcement Structure Node of 30m Precast T Beam Upper Carriageway Slab

1. Cast cast-in-place pile of abutment, cast in place cushion cap, box chamber abutment body, cap beam and install main bridge bearing after passing the inspection. 2. Support erection: the support shall be firm and meet the construction requirements through preloading (it is recommended to use temporary bored pile as the support foundation). 3. Hoist the prefabricated tie rod in place, cast the tie rod joint, end and inner beam in situ (symmetrically from both ends to the middle of the span), and tension the first batch of prestressed reinforcement of the tie rod after the concrete strength reaches 90% of the design strength. 4. The bent frame for installing arch ribs and wind braces shall be erected, the prefabricated arch rib segments and wind braces shall be hoisted, and the joints of arch ribs and wind braces shall be cast in situ. The suspender shall be initially tightened after the concrete strength of the installation joint reaches 90% of the design strength, and the initial tension control force shall be 150 KN. 5. Tension the second batch of prestressed tendons of tie rods. 6. Tension the first batch of prestressed tendons of the beam, lay the carriageway slab (symmetrically from both ends to the middle of the span), cast in situ wet joints, bridge deck pavement and guardrails, and tension the suspender. The tension control force is 350 KN, and the tension of the suspender is mainly controlled by the bridge deck elevation. 7. Tension the second batch of prestressed tendons of the beam. 8. Tension the third batch of prestressed tendons of tie rods. 9. During the tensioning of beam and tie bar prestressing tendon and the tightening of both ends of suspender, the tie bar, arch rib displacement and bridge deck elevation shall be strictly monitored to take timely adjustment measures. 　　

Design standard: Grade 20 automobile, trailer - 100 bridge width: 0.25+3.0+3.0+2 4.5+3.0+3.0+0.25=21.5m. Bridge length: 6.83+5x67.00+6.83=348.66m

The drawing shows the structural drawing of the reinforcement of the main beam carriageway slab of the three span prestressed concrete continuous rigid frame bridge. ... 1 sheet in total.

1. Structure type: upper part: 8.0m span, prefabricated reinforced concrete hollow slab. Support: wax impregnated felt with a thickness of 1cm. Lower part: reinforced concrete light abutment is used to expand the foundation. 2. Main materials: (1) Concrete: 30 # concrete is used for hollow slab, hinge joint, bridge deck pavement and hollow slab head. 25 # concrete is used for abutment cap, abutment body, ear wall, approach slab, foundation and support beam. (2) Stone: grade shall not be less than 30. 　　

The bridge is located in xx Village, xx Town, xx County, close to the National Highway 319, with convenient traffic conditions. The starting and ending chainages of the bridge are K75+706.611 ～ K75+986m. There is a long route chain (K75+725.939=K75+707.328) on the bridge, with a total length of 296m. The plane of the bridge is located on the circular curve of the main line R=1020m; The longitudinal slope on the bridge is 1.365% and - 3.7% respectively; Piers and abutments are arranged radially. The whole bridge is divided into two parts: (3x40) m+(4x40) m; The superstructure adopts prestressed concrete (post tensioned) T beam, and adopts the method of "simple support first and then structural continuity" for construction; The substructure abutment adopts U-shaped abutment and open cut expanded foundation; Column piers and rock socketed dug pile foundations are adopted for bridge piers. 　　

2、 Design standard design vehicle load: automobile - Grade 20, trailer - 120, bridge deck width: (0.5+net 11+0.5) m. Bridge deck cross slope: 2% skew angle: 0 ° Seismic intensity: fortification shall be based on VIII degree. 3、 Technical index 1. Number of main beams: 5 beams 2. Prefabricated beam length: 29.39+x (x=-0.35~0.35) m (side span), 29.3+x (x=-0.35~0.35) m (middle span) 3. Prefabricated beam height: 1.8 m; Composite beam height: 1.95m 4. Installation weight of precast beam: side span middle beam 639KN, side span side beam 594KN; The midspan middle beam is 630KN, and the midspan side beam is 584KN.

Detailed drawing of structural node of 20m I-shaped composite beam upper precast deck slab reinforcement

1. Deck width: the full width of the deck is designed as two-way eight lane plus sidewalk. The transverse direction of the bridge is divided into two completely independent and symmetrical bridges on the left and right. Each bridge deck is 26.1m wide. The specific composition is: 4.8m sidewalk (including railing)+0.5m crash barrier+15.5m roadway+0.5m crash barrier+4.8m bridge crossing water pipe and maintenance lane (including railing). 2. Longitudinal slope of bridge deck: 4%, radius of vertical curve R=6500m 3. Cross slope of bridge crane: two-way 1.5%. 4. Design load: 3.5KN square meters for automobiles - Grade 20 and trailers - 120 people (2.85m clear width of sidewalk). Temperature influence: calculated according to the temperature rise of 20 ° C and the temperature drop of 20 ° C. 5. Navigation standard: for Class III inland waterway, the net width of each navigation hole is not less than 40m, and the net height is not less than 10m. There are two navigation holes in total. Design navigable water level: the elevation of 20-year flood is 4.516m (Yellow Sea elevation). 　　

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%. 　　

Design standard design vehicle load: automobile - Grade 20, trailer - 120, bridge deck width: (0.5+net 11+0.5) m. Bridge deck cross slope: 2% skew angle: 0 ° Seismic intensity: fortification shall be based on VIII degree. Technical index 1. Number of main beams: 5 beams 2. Prefabricated beam length: 29.39+x (x=-0.35~0.35) m (side span), 29.3+x (x=-0.35~0.35) m (middle span) 3. Prefabricated beam height: 1.8 m; Composite beam height: 1.95m 4. Installation weight of precast beam: side span middle beam 639KN, side span side beam 594KN; The midspan middle beam is 630KN, and the midspan side beam is 584KN. 　　

Detailed node drawing of middle steering block reinforcement arrangement on the upper part of prestressed simply supported T-beam

CAD electronic drawing of bridge superstructure, including general structure of L=8M13M slab, reinforcement structure, expansion joint, approach slab, bridge deck continuity, bridge deck pavement, guardrail, etc

1. Deck width: the full width of the deck is designed as two-way eight lane plus sidewalk. The transverse direction of the bridge is divided into two completely independent and symmetrical bridges on the left and right. Each bridge deck is 26.1m wide. The specific composition is: 4.8m sidewalk (including railing)+0.5m crash barrier+15.5m roadway+0.5m crash barrier+4.8m bridge crossing water pipe and maintenance lane (including railing). 2. Longitudinal slope of bridge deck: 4%, radius of vertical curve R=6500m 3. Cross slope of bridge crane: two-way 1.5%. 4. Design load: 3.5KN square meters for automobiles - Grade 20 and trailers - 120 people (2.85m clear width of sidewalk). Temperature influence: calculated according to the temperature rise of 20 ° C and the temperature drop of 20 ° C. 5. Navigation standard: for Class III inland waterway, the net width of each navigation hole is not less than 40m, and the net height is not less than 10m. There are two navigation holes in total. Design navigable water level: the elevation of 20-year flood is 4.516m (Yellow Sea elevation). 　　

• Carriageway position: deck bridge
• Stress of load-bearing components: beam bridge

Content introduction 1. Design standards and specifications 1. Technical Standards for Highway Engineering (JTJ001 － 97) issued by the Ministry of Communications of the People's Republic of China. 2. Standard issued by the Ministry of Communications of the People's Republic of China General Code for Design of Highway Bridges and Culverts (JTJ021-89). 3. Standard issued by the Ministry of Communications of the People's Republic of China, Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTJ023-85). 2、 Technical standard 1. Design load: automobile - level 20; Trailer - 120 2. Deck clearance: net 13.5+2 × 0.5m anti-collision retaining wall (or anti-collision retaining wall) (single width) 3. Span: 28~31m 3. Main materials: 1. Concrete: 50 # concrete for precast T-shaped beam and cast-in-place bridge deck; 25 # concrete for cast-in-place anti-collision parapet; 50 # concrete is used for cast-in-situ beam at expansion joint end and cast-in-situ continuous section at pier top; Asphalt concrete is used for bridge deck pavement. 2. Prestressed steel strand: American standard ASTMA416-87a270 high strength low relaxation prestressed steel strand is adopted. Nominal diameter 15.24mm, nominal area 140mm2, standard strength Rby=1860Mpa, elastic modulus E=1.95 × 105 Mpa. 3. The anchorage used shall meet the design requirements and comply with the provisions of 12.3 in Chapter 12 of the Technical Code for Construction of Highway Bridges and Culverts (JTJ041-2000). Prestressed pipes and materials shall comply with the provisions of 12.4 in Chapter 12 of the Technical Code for Construction of Highway Bridges and Culverts (JTJ014-2000). 4. Ordinary reinforcement shall be grade I and II reinforcement. 5. Steel plate: ordinary carbon structural steel in accordance with GB/T700-88. 6. Plate rubber bearing is adopted. GYZF4 (φ 400 × 88mm) polytetrafluoroethylene sliding plate rubber bearings shall be selected for the corresponding bearings at both ends of the abutment and each link (i.e. the expansion joint), and GYZ (φ 400 × 77mm) plate rubber bearings shall be selected for the rest. 7. The continuous structure of 1~2 holes and one connected bridge deck adopts CD-60 expansion joint; FD-80 expansion joint is adopted for the continuous structure of 3~4 holes and one connected bridge deck; The continuous structure of 5-7 hole single deck adopts QMSF-160 expansion joint. See the design specification of the bridge for special conditions. 4、 Structure and design points 1. Main beam spacing: 2.15m. 2. Number of main beams: 7 pieces per hole. 3. Main beam height: 1.85m. 4. When the radius of horizontal curve is greater than or equal to 400m, there are at most 7 holes in each joint; When the radius of horizontal curve is greater than or equal to 300m and less than 400m, the maximum number of holes in each joint is 5. 5. Distance from the center of the support to the center line of the pier: 0.59m6. Prefabricated T-shaped beams are designed with three end forms, and three T-shaped beams A-shaped T-beams are formed after combination: simply supported T-beams at both ends; Type B T-beam: a simply supported and continuous T-beam at one end; C-type T beam: continuous T beam at both ends; In order to simplify the formwork and facilitate the construction, the width of the prefabricated T-shaped beam rib shall be 20cm, the width of the horseshoe shall be 42cm, and the width of the end beam rib shall be widened to the same width as the horseshoe. In the middle of the bridge span formed in the radial direction of the road centerline, the curved bridge is formed by precast T-beam flange plate and cast-in-place bridge deck. Each hole of the bridge is provided with three middle diaphragms, two end diaphragms, and the middle diaphragms are orthogonal to the main beam. End diaphragms are set radially. Due to the different inclination angles at both ends of the main beam of each bridge, the design will place the central diaphragm at half of the shortest beam of this bridge, and then determine the spacing LAi and LBi of the diaphragm of the other beams. 7. The cross section of bridge main beam is composed of precast T-shaped beam, cast-in-place bridge deck, end diaphragm and middle diaphragm. The rigid plate beam method is used for horizontal calculation. The top transverse slope of precast T-shaped beam is the average of the transverse slopes at both ends of each hole. The bottom cross slope of the middle diaphragm and end diaphragm is consistent with the beam top cross slope. The cross slope of the bridge deck is adjusted by the capping beam and the bearing pad stone. In order to make the bearing set horizontally, beam shoes meeting the longitudinal slope of the main beam are set at both ends of the prefabricated T-beam. 8. In this drawing, precast T-shaped beam is placed on the cap beam, and the simple support system is converted to continuous system. The maximum span is designed as seven spans and one joint. 9. The prestressed design of the main beam adopts fully prestressed concrete in load combination I (automobile+dead load), and other load combinations are calculated as partially prestressed concrete Class A members. The first stage dead load is calculated as a simply supported static structure, and the second stage dead load and variable load or accidental load combination is calculated as a continuous beam system. Layout of Prestressed Tendon Positioning Reinforcement Mesh of Pier Top Deck Reinforcement Layout of Bridge Deck Prestressed Tendon Layout of Mid span Pier Top Deck

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%. 　　

Part of the bridge plane is located on the right turning curve of JD34 (K537+536.9), R=1900m, and part is on a straight line; The vertical slope of the elevation is i=-4.8% (slope length 840), and the stake number of adjacent grade change points is K537+980. In order to improve the driving conditions, the left side adopts a continuous structure of two links (four holes one link+four holes one link), and the right side adopts a continuous structure of two links (four holes one link+four holes one link); There are 6 expansion joints in the whole bridge. 　　

2、 Design standard design vehicle load: automobile - Grade 20, trailer - 120, bridge deck width: (0.5+net 11+0.5) m. Bridge deck cross slope: 2% skew angle: 0 ° Seismic intensity: fortification shall be based on VIII degree. 3、 Technical index 1. Number of main beams: 5 beams 2. Prefabricated beam length: 29.39+x (x=-0.35~0.35) m (side span), 29.3+x (x=-0.35~0.35) m (middle span) 3. Prefabricated beam height: 1.8 m; Composite beam height: 1.95m 4. Installation weight of precast beam: side span middle beam 639KN, side span side beam 594KN; The midspan middle beam is 630KN, and the midspan side beam is 584KN.

Design standard design vehicle load: automobile - Grade 20, trailer - 120, bridge deck width: (0.5+net 11+0.5) m. Bridge deck cross slope: 2% skew angle: 0 ° Seismic intensity: fortification shall be based on VIII degree. Technical index 1. Number of main beams: 5 beams 2. Prefabricated beam length: 29.39+x (x=-0.35~0.35) m (side span), 29.3+x (x=-0.35~0.35) m (middle span) 3. Prefabricated beam height: 1.8 m; Composite beam height: 1.95m 4. Installation weight of precast beam: side span middle beam 639KN, side span side beam 594KN; The midspan middle beam is 630KN, and the midspan side beam is 584KN. 　　 　　

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. 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%.