Introduction to Bucket Dredger Method

2022-05-31

Bucket Dredger generally adopts vertical dredging (that is, along the channel direction) construction. According to different construction conditions, it can be divided into downstream dredging, countercurrent dredging, strip dredging, segment dredging, and layered dredging methods:


(1) Under normal circumstances, the grab dredger should use downstream excavation, mainly to prevent the grab from colliding with the hull. Countercurrent construction is used in areas with low flow velocity or reciprocating tidal currents;


(2) When the designed trench width is larger than the effective excavation width of the dredger, the slit dredging method shall be adopted. The principle of slitting is that the center is divided into two sides, and each adjacent two overlaps to prevent leakage digging. The maximum width of the slits shall not be greater than the effective working radius of the dredger;


(3) When the thickness of the mud layer is greater than the maximum excavation depth of the dredger grab bucket, the layered dredging method shall be adopted. The principle of stratification is that the upper layer should be thick and the lower layer should be thin, so as to improve the dredging efficiency and ensure the dredging quality;


(4) When the length of the excavation groove exceeds the excavation length that the dredger can excavate by setting the main anchor at one time, the construction shall be carried out in sections. The segment length is easy to take 60-70m.