TUAN_THUCTAPDUONG

Vũ Anh Tuấn British R&B Engineering K58 Contents OVERVIEW OF FIELD TRIP 1.1 Location 1.2 Construction Constractor 1.3 Construction Status 1.4 Cross-section Scope  Road Part  Bridge Part Pavement Structure 2.1 Parameters 2.2 Techinal Construction of Base , Sub – Base - Construction Step : - Some Pictures of Road Concrete Batching Plant 3.1 Location 3.2 Structure 3.3 Operating Principle 3.3.1 Operation of the mixing plant 3.3.2 Principle of mixing 3.3.3 Progress of mixing 3.3.4 Capacity of mixing plant 11 Vũ Anh Tuấn British R&B Engineering K58 OVERVIEW OF FIELD TRIP 1.1 Location The project of investment component to build a road connecting the Cau Gie - Ninh Binh expressway with NH1, under the National Highway 1A upgrading and expansion project, Doan Vi section - the northern door and the southern gate - Doc Build , Ninh Binh province 1.2 Construction Constractor The project is conducted by Xuan Truong Company and the owner is Department of Transport and Comunication Ninh Binh 1.3 Construction Status - The starting point is at Km265 + 151.98 in Khanh Hoa commune - Yen Khanh district - Ninh Binh province; The end point is at Km274 + 345 in Mai Son commune - Yen Mo district - Ninh Binh province Total length of the route: 10.94 km - Currently, the first stage has completed the construction of Subbase with Crushed Stone Type II,I and using Drum Road Roller Machine to construct this road Vũ Anh Tuấn British R&B Engineering K58 In the first part, after finishing the Subbase layer, Xuan Truong is implementing the curve and the drainage system has basically been completed Vũ Anh Tuấn British R&B Engineering K58 1.4 Cross-section Scope  Road Part - Specifications : TCVN5729-2012 with +Vtk= 120km/h + Design frequence p = 1% - The width of road : Bn = 17 m including : + traveled way for motorized vehicle : Bcg= x 3,5m = 14,0 m + Medium saparaor : Bdpc= 1,5m + Shoulder and stabilized part of shoulder : Blề= x 0,75 m = 1,5m Vũ Anh Tuấn British R&B Engineering K58  Bridge Part - Specifications : Design for reference TCVN 11823-1:2017 to TCVN 11823-14:2017 with additive work - Add 01 unit on the left side of Dong Thinh bridge, the same scale as the built one Bc = 13.75m Pavement Structure kết cấu mặt đường làm 2.1 Parameters - Pavement Structure is calculated for specifications 22TCN 211-06, standard axel P = 120kN with Eyc = 205 Mpa and E0 = 100Mpa Base on this parameters , consultant chosed pavement structure as : + Eyc ≧ 205 Mpa , Design Reliability : 0,95 and Load Axle : 12T + Compacted Asphale Concrete 12,5 ; h = cm + Compacted Asphale Concrete 19 ; h = cm + Porous Asphalt Concrete ; h = 10 cm + Crushed Stone Typr I ; h = 34 cm + Crushed Stone Type II ; h = 18 cm + Subgrade h = 30 cm 2.2 Techinal Construction of Base , Sub – Base - Constructed Capping Layer based on Specifications TCVN 8859 – 2011 Constructed AC layer based on Specifications TCVN 8819 – 2011 Vũ Anh Tuấn British R&B Engineering K58 - Construction Step : - ① Construction of graded Crushed stone type I layer with bottom 18cm thickness ② Construction of graded Crushed stone type II layer with upper 34cm thickness ③ Irrigation plastic to adhesion 1.0kg / m2, construct a porous asphalt concrete layer of 10cm thickness ④ Watering with adhesive plastic 0.5kg / m2, construct compacted asphalt concrete 19 thick of 10 cm ⑤ Watering with adhesion of 0.5kg / m2, construction of compacted asphalt concrete 12.5 (using anti-coach additive) 6cm thickness Some Pictures of Road Vũ Anh Tuấn British R&B Engineering K58 Vũ Anh Tuấn British R&B Engineering K58 Concrete Batching Plant 3.1 Location Concrete Batching Plant (DongSung Co,LTD.) is away from Contruction Road about 3km 3.2 Structure + (1): Cold feed hopper + (11): Mineral powder bucket ice; Additives + (2): Preliminary dosing equipment + (12): Weighing hopper + (3): Roller conveyor + (13): Mixing drum + (4): Drying drum + (14): Plastic dosing device + (5): Burning chamber + (15): Plastic concrete transfer equipment + (7): Dry filter equipment + (16): Transportation vehicle + (8): Ice bucket hot + (17): Plastic storage tank combined with heating equipment + (9): Sieve to classify + (10): Mineral powder storage; Additives 3.3 Operating Principle 3.3.1 Operation of the mixing plant The batching plant is automatically controlled and pre-programmed according to AC's process and technical requirements according to each project, when there is a problem, then manually control Vũ Anh Tuấn British R&B Engineering K58 3.3.2 Principle of mixing Asphalt concrete is mixed according to the forced principle Time to mix mineral aggregates Dry is about - 10 seconds, wet mixing time with watering asphalt binder is about 38-45 seconds per batch 3.3.3 Progress of mixing Sand and rock from the warehouse are loaded by the loader into the feed hopper compartments 1, each compartment The bottom of each hopper is fitted with a material pre-dosing device called an inverter (variable Frequency will adjust the amount of aggregate feed to ensure that the aggregate does not spill overload when reaching hot bin containing aggregate), material will fall to feed chute before put on conveyor Materials are brought to the drying drum by bucket Here the aggregate is made 180 - 200oC heat due to the fire in the combustion chamber In the drying drum, the very small particles will be sucked out to the surface of sediment, grain the other is put directly into the hot bucket section The heat after going from one end to the other end of the drying barrel will go into the devices Vũ Anh Tuấn British R&B Engineering K58 Dust collection and then discharged into the sludge tank Dust is collected if it does not contain clay particles and having appropriate mechanical properties will be brought to the stone powder barrel for reuse Two silos to put the dough stone (mineral powder) mixed together with stone and asphalt Using dry dust filter system instead of wet filter of old stations Filter dry normally used for high quality projects (due to special requirements from TVGS such as expressways HN - HP ) Dry filter does not pollute the environment, collect dust to improve calf quality taller tones, minimizing wheel trailing effects; avoid plastic slip on the road surface Crushed stone materials after being heated to a temperature of 180 - 200oC will follow The hot bucket is put into the screener Here, the sieving machine sorts the appropriate particle sizes The grain size of the mangrove tree and the designs according to each project's technical requirements Each particle size will fall into a corresponding compartment of a tank called a hot aggregate bin Next, at bin The heater will be combined with the automatic weighing system to determine the particles according to the design to weigh and transfer the quantified hot aggregate to the mixing chamber 10 Vũ Anh Tuấn British R&B Engineering K58 Stone powder is transferred from additive 10 xilo to a separate compartment of the container thanks bucket tape 11 Under the compartments of the container are the weighing devices 12 Here, the mixes the material is again weighed according to the specified ratio of the asphalt mixture and then okay put into mixing tank 13 When asphalt imported from a vehicle from a supplier into the tank, the temperature is normal reach about 100 - 110oC Plastic after being heated to a temperature of 140 - 150oC About hours in heater 17, through pipes and pumps, plastic is pumped and quantified again in metering device 14 and then pumped into the mixing tank The aggregate, mineral powder (or additive) is mixed well in the mixing tank 13 with a time of 10 - 15 seconds Then, the plastic will spray in and knead for 38-45 seconds just open the discharge door to dump the product into the truck The temperature of the concrete mixture after mixing must reach 150 - 160 C (if transported away the temperature can be 170C) Cycle for batch to mix about 50s Each discharge batch produces tons of asphalt concrete / discharge The output product has a temperature of about 170 degrees for normal asphalt and about 180 for asphalt concrete 3.3.4 Capacity of mixing plant - Capacity: 104 -120 tons / hour Capacity of batch of discharge is: tons / batch 11