CN102733434A

CN102733434A - Method for dredging underwater polluted sediment

Info

Publication number: CN102733434A
Application number: CN2011100901625A
Authority: CN
Inventors: 蒋基安; 林风; 周海; 罗荣民; 陈海英; 洪国军; 王费新; 郝宇驰
Original assignee: Shanghai Waterway Engineering Design and Consulting Co Ltd
Current assignee: Shanghai Waterway Engineering Design and Consulting Co Ltd
Priority date: 2011-04-11
Filing date: 2011-04-11
Publication date: 2012-10-17
Anticipated expiration: 2031-04-11
Also published as: CN102733434B

Abstract

A method for dredging underwater polluted sediment relates to a dredging method. The invention provides a dredging method without pollution diffusion. The dredging device is characterized in that a guide rail of the dredging device is in sliding fit with a guide device on a pile frame, when the dredging device is lowered to be close to the surface layer of bottom sediment, a cable is released, the dredging device penetrates through a polluted bottom sediment layer and a pollution-free layer to reach the pollution-free sand layer along with the rotary cutting of a reamer head of the reaming system and the flushing water and the self weight of equipment of the vertical flushing system, the dredging device is driven into the pollution-free layer, meanwhile, a sand suction pump of the sand suction system sucks a sand source of the pollution-free sand layer, the pollution-free layer and the polluted bottom sediment layer on the upper part of the pollution-free sand layer are settled, and pollution-free sand pumped up by the sand suction pump is discharged and backfilled onto the polluted bottom sediment through the sand suction pump to cover the polluted bottom sediment layer.

Description

A kind of dredging is the method for polluted bed mud under water

Technical field

The method that the present invention relates to dredge.

Background technology

The poisonous and harmful and the high nitrogen and phosphorus pollutants that contain higher concentration in a large amount of industrial wastewaters are like heavy metal Cr, Hg, Zn etc. and toxic organics such as oil, chlorobenzene, aniline etc.Though industrial wastewater is handled through Wastewater Treatment Plant; But according to the present technology of Wastewater Treatment Plant, it is very limited to the disposal ability that poisonous and harmful pollutes, and big multi-pollutant enters in the river and lake with water; And in bed mud, accumulate, worsen water quality and destroyed original aquatic organism ecological circulation.Existing dredging is stirred pine back through the excavation facility with earth with the hydraulic reclamation engineering and is sucked again through line transportation ashore by dredge pump.To produce violent disturbance to bed mud during the facility dredging; Even use the equipment of environment-friendly function also to produce secondary pollution to dredging on-the-spot water body on every side unavoidably, and dredging after stain bed mud water content is high, follow-up dehydration and drying difficult treatment; Workload is big, cost is high; And remained water discharge there is strict demand, the more important thing is under the present rare situation of land resources, seek suitable disposal field and become very difficult.

Summary of the invention

The purpose of this invention is to provide a kind of pollution-free diffusion and need not the dredging method of subsequent treatment.

Technical scheme of the present invention adopts strand cutting system, vertical flushing system, horizontally rotates flushing system, inhales the dredger that sand system, water charging system and cylindrical sleeve are formed; It is characterized in that longitudinal rail being arranged on the cylindrical sleeve both sides of dredger; Establish the pile frame of tape guide on the dredging vessel platform; The longitudinal rail of cylindrical sleeve and the guiding device on the pile frame are slidingly matched, and utilize the hoist engine of dredger to realize transferring of dredger and upwards recovery; When dredger was transferred operation, dredger vertically hung down along the pile frame guiding device, during near the bed mud top layer; Loosen hawser,, utilize to horizontally rotate flushing system water spray around reamer along with the rotary cutting of strand cutting system reamer head and the bath and the equipment self-weight of vertical flushing system make dredger pass polluted bed mud layer and the not contaminated layer of sand of pollution-free layer arrival; Enlarge the reamer strand and cut scope; Cut under the washing away with current in strand, dredger is attacked in pollution-free layer, simultaneously; The sand source that the Sand pump of suction sand system aspirates pollution-free layer of sand; Cause the pollution-free layer and the polluted bed mud layer generation sedimentation on pollution-free layer of sand top, the pollution-free sand that Sand pump aspirates up goes out the sandpipe discharge through Sand pump and is backfilling on the polluted bed mud, and the pollution-free sand that the polluted bed mud layer then is pumped up covers.

Outstanding feature of the present invention is to adopt the rotary cutting of strand cutting system reamer head and the bath and the equipment self-weight of vertical flushing system to pass the polluted bed mud layer; And arrive pollution-free layer of sand fast; Utilize the pollution-free sand of suction polluted bed mud layer bottom; Pollute sediment layer and pollution-free layer generation sedimentation, the pollution-free sand that simultaneously suction is come up is backfilling into isolates polluted bed mud on the polluted bed mud, does not produce secondary pollution to dredging on-the-spot water body on every side; And need not seek suitable disposal field and carry out subsequent treatment; Therefore also saving the land resources of subsequent treatment, have easy construction, low, the free of contamination remarkable result of cost, is the once completely newly change of anti-pollution diffusion in the environmental dredging field.

Description of drawings

Fig. 1 is an operating principle sketch map of the present invention.

Fig. 2 is the structural representation of dredger.

Fig. 3 is the schematic side view of Fig. 2 bottom.

The specific embodiment

The present invention is equipped with lower component (referring to Fig. 2, Fig. 3):

Strand by drive motors 3 and driving thereof is cut the strand cutting system that reamer head 4 is formed;

The vertical flushing system of forming by vertical bath water inlet pipe 8 and vertical cistern 14 and vertical bath outlet pipe 12;

By horizontally rotating bath nozzle 5 and horizontally rotating the flushing system that horizontally rotates that bath feed pipe 6 forms;

Go out the suction sand system that sandpipe 7 is formed by Sand pump 1 and sand water mixed liquor import 21 and Sand pump;

The water charging system of forming by water pipe water inlet pipe 11 and replenishing water tank of water 2.

Above-mentioned parts assemble in the following manner:

Drive motors 3 and the strand that drives thereof are cut reamer head 4 and are contained in cylindrical sleeve 9 belows;

Vertical bath water inlet pipe 8 gets into cylindrical sleeve from the cylindrical sleeve top, be connected to the vertical cistern 14 that is contained in the cylindrical sleeve, and vertical bath outlet pipe 12 picks out from vertical cistern 14 and vertically is laid in the cylindrical sleeve outside;

Horizontally rotate bath feed pipe 6 and vertically install, horizontally rotate bath nozzle 5 and be contained in and horizontally rotate bath feed pipe lower end along the cylindrical sleeve outside;

Water pipe water inlet pipe 11 gets into cylindrical sleeve from the cylindrical sleeve top, receive the replenishing water tank of water 2 that is contained in the cylindrical sleeve bottom;

Sand pump 1 is contained in vertical cistern bottom, and sand water mixed liquor import 21 is located at the cylindrical sleeve lower end, and Sand pump goes out sandpipe 7 and links the cylindrical sleeve top along cylindrical sleeve and pick out;

Above-mentioned each system forms a whole set of non-proliferation environmental dredging device.

The outside of cylindrical sleeve vertically is provided with guide rail 10; At boats and ships platform 25 pile frame and hoist engine extension and retraction system are set, have guiding device on the pile frame, make things convenient for dredger to transfer and reclaim, and resist the strand shear force that produces when the reamer head cuts through guiding device; When equipment reclaimed, hoist engine through extension and retraction system 24 was sling equipment.

The environmental dredging device operates (referring to Fig. 1, Fig. 2) by following mode:

Dredger 22 vertically hangs down along pile frame 23 guiding devices; During near the bed mud top layer; Loosen hawser, Sand pump 1 along with the rotary cutting of strand cutting system reamer head and vertical bath and equipment self-weight pass polluted bed mud layer 30 arrive with pollution-free layer 29 under not contaminated layer of sand 28, utilize be arranged in the reamer outside horizontally rotate bath 27 nozzles water spray around reamer; Enlarge strand and cut scope, enlarge subsidence range; The level bath is through horizontally rotating bath and keeping the bath flow and the flow that shakes out quite to realize upper strata separation layer and top layer polluted bed mud layer uniform settlement; Twisting the souring of cutting with current continues to attack fast in pollution-free layer; Attacking simultaneously; Sand pump is adjusted vertical bath flow through the pollution-free sand of sand water mixed liquor inlet suction source, keeps inflow equal basically with Sand pump 1 outflow; When equipment be deep under the polluted bed mud contain layer of sand after, close reamer and vertical bath, open side level bath, adjustment level bath flow keeps inflow equal basically with outflow; The pollution-free pure sand 26 that simultaneously Sand pump is aspirated up goes out sandpipe through Sand pump discharges, and covers on the polluted bed mud on top layer; After Sand pump is inhaled and removed pollution-free sand, form sinking of polluted bed mud layer and pollution-free layer, Sand pump goes out the following cratering top that sandpipe covers the sand water mixed liquor backfill of discharging on the polluted bed mud layer; Level bath folk prescription turns over certain angle after spraying a period of time, folk prescription can be adjusted according to the variation that pump is inhaled sand concentration to the length of injecting time; After accomplishing one-sided jeting area, close when front side level water spray, open the opposite side current and continue to spray washing away in accomplishing the whole circumference scope; Under level bath and pump-absorb action, upper strata layer of sand and pollution of surface sediment layer uniform settlement, the pollution-free sand that top layer polluted bed mud layer is pumped up covers; Inhale in sand sedimentation and the overwrite procedure and can pass through near the water pipe moisturizing Sand pump suction inlet, the operate as normal of holding pump prevents the generation of " vexed pump " phenomenon, guarantees the Sand pump operate as normal; When equipment reclaims, equipment is sling through hoist engine; The present invention excavates, carries construction to form partial closure in the pure layer of sand, and the environmental dredging process of pollution-free diffusion has realized the isolation of polluted bed mud layer and water body, will poison and the nutriment eliminating outside ecological circulation and improved water quality.

Claims

1. dredge the method for polluted bed mud under water for one kind; Adopt strand cutting system, vertical flushing system, horizontally rotate flushing system, inhale the dredger that sand system, water charging system and cylindrical sleeve are formed; It is characterized in that longitudinal rail being arranged on the cylindrical sleeve both sides of dredger; Establish the pile frame of tape guide on the dredging vessel platform, the longitudinal rail of cylindrical sleeve and the guiding device on the pile frame are slidingly matched, and utilize the hoist engine of dredger to realize transferring of dredger and upwards recovery; When dredger was transferred operation, dredger vertically hung down along the pile frame guiding device, during near the bed mud top layer; Loosen hawser,, utilize to horizontally rotate flushing system water spray around reamer along with the rotary cutting of strand cutting system reamer head and the bath and the equipment self-weight of vertical flushing system make dredger pass polluted bed mud layer and the not contaminated layer of sand of pollution-free layer arrival; Enlarge the reamer strand and cut scope; Cut under the washing away with current in strand, dredger is attacked in pollution-free layer, simultaneously; The sand source that the Sand pump of suction sand system aspirates pollution-free layer of sand; Cause the pollution-free layer and the polluted bed mud layer generation sedimentation on pollution-free layer of sand top, the pollution-free sand that Sand pump aspirates up goes out the sandpipe discharge through Sand pump and is backfilling on the polluted bed mud, and the pollution-free sand that the polluted bed mud layer then is pumped up covers.