A Construction Technology of Dredging Blowing and Filling Sand Bags

Abstract

The invention relates to a construction technique of dredging blowing filling sand bag, which includes steps of (1), optimizing a sand bin scheme; analyzing sand source quality of the set sand bin zone according to the sand bin landform and shell content distribution; selecting a peripheral zone with less than 20% of shell content to dredge; (2), building a temporary sand filling bag barrier at the periphery of the sand bin, and blocking tide flow so as to increase effective sand taking time; (3), building 2-4 small sand bins at four sides of the sand bin according to the landform; (4), mounting a tee shunt on a main pipeline of a cutter suction dredger in dredging work, wherein the main pipeline discharges a big volume shell and a clay ball, and a branch pipe is used as a sand blowing pipe; blowing qualified sand acquired by screening to the sand bin; (5), alternatively take sand from the middle of the main sand bin and every small sand bin to blow and fill the sand filling bag; arranging the cutter suction dredger in dredging work to blow sand to the sand bin after taking sand; (6), repeating step (5).

Description

technical field [0001] The invention belongs to the technical field of dredging construction, and in particular relates to a dredging construction technique of blowing and filling sand bags. Background technique [0002] In the dredging site construction, it usually involves the sand bag construction process, that is, the approach embankment uses sand bag cofferdams on both sides, and then internal backfilling to form the approach embankment body. During the construction of the project, the underwater sand extraction process was used in the early stage of the sand filling bag, but it was usually not successfully implemented due to the soil quality. , the construction cost will be significantly increased, and it will have a significant impact on the construction period. The key point and difficulty in improving the construction technology of sand-filled bags is the acquisition of sand sources. [0003] Under on-site construction conditions, the acquisition of sand sources i...

AI Technical Summary

Problems solved by technology

Due to the poor fluidity of shellfish, it is not easy to transport, and the mud pump hose and sand blowing pipeline are frequently blocked during sand filling construction.

(2) On-site resources are scarce, and marine equipment is limited

(3) The designed location of the temporary cofferdam has deep water depth, strong wind and waves, rapid tidal current and high ebb and flow velocity, with local areas reaching 4 knots, and the positioning and construction of the sand-filled cofferdam is difficult

(4) The underwater terrain in the sand-filled bag design area is complex, with large fluctuations

The underwater terrain in the construction area of ​​the project is complex, densely covered with hidden reefs and deep grooves, and the terrain changes greatly; and both sides of the sand bank are deep grooves, so sand-filled construction pipelines cannot be avoided

(5) The construction of layered filling with sand bags in the deep water area of ​​the temporary cofferdam is relatively difficult

According to the design drawings of the temporary cofferdam, the deep-water area needs to be constructed in layers. After the first layer of sand bags is filled, the inner side of the cutter suction ship is blown and filled, and then the second layer of construction is more difficult.

(6) Insufficient estimation of on-site difficulties

The hydraulic engineering of the project is in charge of the construction by the cooperative unit. The difficulty of the project was underestimated during the early inspection period. The sand blowing pipelines entering the site are all old pipes with poor quality. There are many bursts during the construction period, which seriously affects the construction