2 build " highway solid Wu " this course involves roadbed project, road surface project, bridge contain project, tunnel project, traffic project the content of 5 respects, examinee should form framework of a system in the process of study, can remember each paragraphic knowledge point easily so. Review to help examinee, learn one's deceased father earth up educational general 2019 2 build " highway solid Wu " paragraphic check a place: The prevention and cure of problem of quality of roadbed squeezing ramming shares everybody, the hope can aid your a helping hand.
Roadbed drive a vehicle takes squeezing ramming to spend insufficient reason and prevention and cure
1. case study
(1) squeezing ramming alls over several insufficient;
(Ply of earthy, filling does not match machinery of 2) squeezing ramming and filling;
(3) is ground pressure inhomogenous, local leakage presses phenomenal;
(Deviate of 4) water content is optimal water content, exceed effective squeezing ramming to set value;
(5) does not have dust collected on furniture of pair of surface of the layer before tightening or loose layer to undertake punish;
(6) earth field is earthy and phyletic much, appear to be not mixed with category earth fill;
(7) filling grain is too big (> 10cm) , gap is too big between grain, or filling does not accord with a requirement, if opaque earth, organic soil reachs the clay of tall plasticity index,wait.
2. Administer measure
(1) because water content is unsuited did not approach real time, aspersion or ted come undertake grinding pressing afresh again when optimal water content;
(2) because filling is earthy unsuited did not approach real time, earth of cleared unsuited filling, change after writing benign ground, grind afresh pressure;
(3) is right generation " bedspring earth " place, can cross its wet earth ted, or pink turns over mix into calx mix, wait for its grind afresh after water content comfortable announce press; or dig except change after filling the benign soil with appropriate water content, grind afresh pressure.
2, the reason that squeezing ramming of roadbed predestined relationship spends inadequacy and prevention and cure
1. case study
(1) roadbed is filled build width inadequacy, did not press super- wide fill build requirement construction;
(Machines and tools of 2) squeezing ramming is ground do not press edge;
(Leakage of 3) roadbed brim is pressed or squeezing ramming alls over several insufficient;
(4) uses roller 3 rounds to grind when pressing, the brim is taken (0~75cm) is ground press frequency to be taken under drive a vehicle.
2. Administer measure
