CN102733349A - Method for de-silting lake and constructing lake center island - Google Patents
Method for de-silting lake and constructing lake center island Download PDFInfo
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- CN102733349A CN102733349A CN2011100964624A CN201110096462A CN102733349A CN 102733349 A CN102733349 A CN 102733349A CN 2011100964624 A CN2011100964624 A CN 2011100964624A CN 201110096462 A CN201110096462 A CN 201110096462A CN 102733349 A CN102733349 A CN 102733349A
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Abstract
The invention provides a method for de-silting a lake and constructing a lake center island and belongs to a construction technology. The method comprises the following steps of: de-silting and dredging, transporting sludge, carrying out storage yard treatment, curing the sludge, discharging tail water and constructing the lake center island while de-silting. The method disclosed by the invention solves the problem that old problems of de-silted lake water happen again. The engineering cost is reduced, the work period is shortened and the secondary pollution is managed. The method has the characteristics of smaller occupied space, no transferring of pollutants, investment saving and good benefits. According to the method disclosed by the invention, the swampiness problem is solved, the water storage amount is increased, a land resource is increased, a wetland park is established and the pollution recycling is realized. The method is a practical and feasible good method for managing and beautifying the lake.
Description
Technical field
The present invention relates to the lake dredging up method, is again a kind of ait construction method simultaneously.Belong to Building technology.
Background technology
Along with the fast development of economic society and the continuous quickening of urbanization process, it is controlled fully that a large amount of industry of lake periphery and sanitary sewage are difficult to, and causes that bed mud deposits seriously in the lake in; Pollutant load generally exceeds standard in the bed mud, and ecological environment is damaged, and water body goes from bad to worse; Aggravation along with the water pollution; Water quality can't satisfy the normal water supply requirement, even sudden water quality deterioration incidents such as " blue algae bloom ", " Kuroshio " take place, and direct threats regional water supply and ecological safety.Being deposited in a large number in the lake of pollutant and rubbish accumulated over a long period, and forms more and more thicker mud layer gradually, and this not only makes lakebed improve, and storage capacity reduces, and contaminated environment influences traffic, and the function of controlling flood and draining flooded fields is influenced deeply.In meeting flooding in flood season, jeopardize dyke, cause floods.
For improving the lake quality of water environment, mud is to remove to pollute endogenous unique method at the bottom of the removing lake.Safety is excavated polluted bed mud on effectively suppressing the basis that pollutant discharges in the bed mud, improves water body self-purification ability, thereby creates conditions for the lake region environment remediation.The lake alluvial is administered and has been become a urgent problem.
Desilting is carried out in the lake, city; Restrictive condition is many, influence basin is big, influence factor is many; Need to be optimized selection, confirm to be fit to the resolution of characteristic of city at aspects such as desilting mode, means of transportation, stockyard selection, mud mummification, tail water processing and strick precaution secondary pollutions.The problem that at first runs into is that the mud that comes out does not clearly have local the placement, and the processing of a large amount of mud also more and more becomes a stubborn problem.Traditional processing method is: prepare one in advance and be worth less low-lying land, the mud that produces desilting is poured on this plot, and the earth after the natural mummification can be used as agricultural soil and uses.Along with the pollutant in the current bed-silt is more and more; Concentration is increasingly high; Even some pollutant toxicity is huge, and traditional process for treating sludge is unsatisfactory, and the soil and the water source on ground stacked in pollution that can be serious; Add the often cacodorous gas with foreign flavor of mud, make and stack the peripheral air pollution in ground.Going out clearly on the hillside that mud is deposited in lakeside, Taihu Lake is going out the periphery that mud is deposited in Taihu Lake clearly like the West Lake in Hangzhou, and one rains heavily, and mud is got back in the lake again and gone.Next problem that runs into is also to cause the pollution of water body in the desilting process, goes out mud clearly and is deposited in lakeside, can't in time handle the secondary pollution that also causes.
Summary of the invention
The present invention is directed to this problem, the new comprehensive treatment scheme that on the basis of a large amount of early-stage Study, proposes.Build dykes and dams and ait when purpose is to satisfy the desilting function, can also increase land resources, build up wetland park.
Technical scheme of the present invention comprise desilt and dredge, mud transportation, stockyard processing, sludge solidification, tail water discharging; It is characterized in that: the first step; At first to the geology and geomorphology of lake and periphery and hydrological regime survey, confirm to build the position of dykes and dams and ait; In second step, the periphery in this position carries out ground to be handled, and sets campshed and joins together, builds up the hard-shell dyke that is higher than the water surface; In the 3rd step, fill out filtrate in the inwall throwing of campshed trap filtration beds is set; The 4th step, desilted and dredged in the lake, be stacked at nearby in the scope of hard-shell dyke trap, and the mud of desilting and dredging is added dehydration hardener; The 5th step, get the elevation that mud after the curing is increased peripheral dykes and dams, form ait and island Zhong Hu; The 6th step, the peripheral dykes and dams of ait along the limit bank protection, and the tree and the grass of plantation resistant mud.
Described exploration to lake and periphery is in order to find and confirm to build the position of dykes and dams and ait.The general requirements physical features is higher, and base stabilization near the waters of need dredging desilting, meets the requirement of overall plan layout as far as possible.Simultaneously the physical and chemical index of geology and geomorphology, hydrological regime, silt is investigated.
Described peripheral ground is handled, and sets campshed and is in order to build up stable dykes and dams, to be unified between the campshed together, supporting mutually, and trap becomes the man-made island or the artificial peninsula of different shape.Hard-shell dyke adopts the sheet pile that is " Ω " type or " S " type, and connection forms, and is provided with catching groove at the two ends of sheet pile, and padlock supports each other mutually.So that join together between the sheet pile.All be provided with drain hole at each face of sheet pile.
Described filtration beds is in the inboard of sheet pile trap one deck material for core to be set, and can adopt common foamed plastic filter plate, also can adopt one or more of geotextiles, haydite, rubble, coarse sand.The structure of filtration beds and size are to confirm according to the physical and chemical index of silt.
Described dredging desilting can adopt the environment-friendly type desilting to fail mud equipment, bury pipe conveying equipment or Suction Dredger, dredges the earth in the lake, is stacked in the scope that duricrust sheet pile circle puts.Dredging desilting position should not be too near from dykes and dams, should be generally selected in be and 50 meters to 300 meters away from dykes and dams fetch earth in addition according to the dykes and dams height.Choosing got the small value when the dykes and dams height was low, chose big value when highly high.In order to avoid influence the stable of dykes and dams.
Described dehydration hardener, one or more among employing cement, gypsum, lime, slag, flyash, sodium sulphate and the alum, proportioning and used in amounts are analyzed the composition of mud, confirm according to the physical and chemical index of mud.Generally be the mud mass percent 2%～30% between.
The described elevation of increasing peripheral dykes and dams should calculate the quantity of sand and mud of good total dredging desilting and build the required quantity of sand and mud of man-made island according to historical hydrological data.Also island Zhong Hu can be set, the silt of getting lake in the island is increased peripheral dykes and dams elevation to periphery.Carry out ground at important building thing position and handle, the position of doing harbour, bridge and road at needs performs the planning reservation.
Described plantation and along the limit bank protection is on the island, to plant some to be fit to local growing plants flowers and plants, be used to improve the soil and beautify the environment, do the environmental protection and the ecological homeostasis simultaneously well.
Good effect of the present invention:
Owing to carry out the ground processing at position periphery that adopt to build dykes and dams and ait, set campshed and join together, build up the stable hard-shell dyke that is higher than the water surface fast.
Owing to be employed in the inwall of campshed trap filtration beds is set, mud is used line transportation, is stacked at nearby in the scope of hard-shell dyke trap, has shortened the transport distance of mud.Can not build the island and cause secondary pollution, influence the water quality in whole lake because of desilting.
Owing to added dehydration hardener, make silt consolidation fast, intensity is big, has shortened the improvement duration in lake.
Because the lake has obtained the comprehensive regulation, builds up wetland park, obtain the tract resource.Balance is ecological, beautifies the environment.
The present invention one do not take up an area of, two do not transfer the pollution thing, three reduced investments, four many characteristics of benefiting.Can reduce engineering cost, the reduction of erection time, minimum to the ambient influnence of job site, and can administer secondary pollution, the difficult problem that lake water is had a relapse after the solution desilting makes the lake obtain the comprehensive regulation, achieves many things at one stroke.Be to administer and beautify the practicable good method in lake.
Description of drawings
Fig. 1 is two interface pile sectional views, and Fig. 2 is four interface pile sectional views, and Fig. 3 is that pile connects figure with sheet pile, and Fig. 4 is from yoke plate stake sectional view, and Fig. 5 is the ait plan view, and Fig. 6 is an ait partial section.Comprise: pile core (1), pile are buckled (2), sheet pile (3), pile (4), are buckled (6), the female button (7), drain hole (8), defeated mud ship (9), mud conveying pipeline (10), inner slope (11), hard-shell dyke (12), filtration beds (13), island Zhong Hu (14), bank protection circle (15), the outer water surface (16), mud (17), suppressing layer (18), the interior water surface (19), hydraulic reclamation layer (20) from yoke plate stake (5), hero.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Embodiment 1: thick mud has deposited for lake in certain city, city, lakebed.Contain a large amount of pollutants in the mud, its pollute with suspension effect again be the major reason of lake water pollution.The mud alluvial, lake water is rotten, and the lake appearance is dwindled, and bogginess is serious.Have to make a decision and renovated, but stacking mud wants land occupation, contaminated environment; Transportation mud is messy, pollutes road; The expensive consumption of mud landfill ground is huge, and recycling sludge is handled, and is easier said than done.Problems are perplexing the improvement in lake always.
Resolution of the present invention comprises that the stockyard is selected, campshed sets, builds dykes and dams, desilts and dredges, the defeated mud of pipeline, dehydrating and curing, plantation bank protection; It is characterized in that: select physical features higher in lake center; The position that ground is more steady sets a circle with vibrating hammer and is detained mutually to connect by sheet pile, pile and form campshed; At the inwall of campshed trap spread a layer of clay worker's cloth, one deck rubble, one deck coarse sand, throw in the outside of campshed trap and to fill out one deck coarse sand; Adopt the defeated mud ship of environment-friendly type desilting leaving 200 meters zones suction mud in addition of campshed, desilted and dredged in the lake; Through mud conveying pipeline mud is admixed 6% sludge dewatering and solidifying agent, be stacked in the scope of filtration beds trap; Get in the ait mud of dehydrating and curing and increase the elevation of peripheral dykes and dams; On ait, plant willow, metasequoia tree, plantation reed, wild rice stem, the stem or leaf of cattail, and on limit, all edges bank protection.When desilting and dredging, build ait.
Selecting the stockyard as the ait position in lake center, is the equidistant of mud conveying pipeline (10) in order to desilt and dredge, and to reduce downtime, improves transfer efficiency.Be that physical features, ground, defeated mud distance, a plurality of factor optimizations of programming and distribution are confirmed.
Set the circular campshed of the parallelly connected all-in-one-piece of a circle with vibrating hammer, as shown in Figure 5; Campshed is detained mutually to connect by sheet pile (3), pile (4) and forms, and is as shown in Figure 3; Pile (4) has two kinds of two interface piles and four interface piles, middlely buckles (2), sectional view such as Fig. 1, shown in Figure 2 for pile core (1), limit are provided with two or four piles; Sheet pile (3) all is provided with drain hole (8) for " Ω " type, each face that elongates.
Filtration beds (13) selects for use geotextiles, rubble, coarse sand as filtrate; Also can set two-layer campshed, be positioned over filtrate between the two-layer campshed, build up the hard-shell dyke (12) that is higher than the water surface.
Throw in the outside of campshed trap and to fill out some coarse sands, both stablize dykes and dams, can compress peripheral mud again, weaken it and pollute and suspension effect again as suppressing layer (18).
Adopt the zone of the defeated mud ship (9) of environment-friendly type desilting beyond bank protection circle (15) scope to inhale mud, and, can not cause the pollution in waters with the mud conveying pipeline (10) that seals.The lake is dredged; Mud (17) descends; Mud is stacked in the scope of hard-shell dyke trap through mud conveying pipeline (10); Hydraulic reclamation layer (20) forms nature inner slope (11), and the interior water surface (19) is higher than the outer water surface (16), mud precipitates at leisure, is expelled back in the lake through the clear water of filtration beds (13).Because the mud layer and the water surface (19) in the construction period hard-shell dyke (12) all are higher than outside the hard-shell dyke (12), form a tension force from inside to outside, the campshed that joins together forms lock ring, produces pulling force, and round ait has just built up.
Add the sludge dewatering and solidifying agent of admixing, comprise cement 28%, gypsum 10%, lime 11%, slag 35%, sodium sulphate 8% and the alum 8% of mass percent.The consumption of sludge dewatering and solidifying agent can change according to the position that mud fills is different.
Get in the ait the mud of dehydrating and curing and increase the elevation of peripheral hard-shell dyke (12), in ait, set up island Zhong Hu (14), also the stockyard is provided for administering later on; Ait need be built the position of pavilions, terraces and open halls and road and bridge can carry out precompressed and ground processing.In the lake island is arranged like this, the lake is arranged in the island, the lake is just more beautiful.
Plant willow, metasequoia seeds reed, wild rice stem, the stem or leaf of cattail on the island and be the tree of resistant mud and the grass of resistant mud.Ammonia in the plant absorbing mud, nitrogen growth, the chemical energy in the mud changes into biomass energy, realizes recycling sludge.Plant and bank protection at the peripheral dykes and dams on island along the limit.Lake dredging up is made the island, has solved the bogginess problem, has increased water retention capacity, increases land resources, builds up wetland park.Save the soil, cost saving is saved time.
Embodiment 2: so-and-so lake is the water source of the water works in certain city, owing to receive the normal erosion of upland water for a long time, the two sides, river course are constantly by erosion, and soil erosion is accumulated over a long period, the lakebed more and more thicker mud layer that deposited gradually.This not only makes the riverbed improve, and the lake holds reduces, and contaminated environment influences traffic, and in meeting flooding in flood season, jeopardizes dyke, causes floods.The engineering of desilting and dredging is in the past stacked the mud of dredging desilting in lakeside, get back in the lake once the mud of the lakeside of raining, and is always clear and become silted up, and become silted up and clear.Administer engineering and cure the symptoms, not the disease often, engineering efficient is lower.
Resolution of the present invention and embodiment 1 are basic identical, it is characterized in that: the periphery in the position of confirming construction dykes and dams and ait plugs from yoke plate stake (5), and is as shown in Figure 4 from yoke plate stake (5), and hero button (6) that two ends are provided with and female button (7) button mutually connect; Inwall from yoke plate stake (5) trap is provided with one deck polypropylene filter material, forms filtering layer (13); The mud of being desilted and dredged in the lake is stacked in the scope of filtering layer (13), begins from minimum position, adopts the thin layer wheel to add, placement in layers, and balanced the rising, lift height is controlled at 0.2～0.5 meter.Reach design altitude through repeatedly piling to build.Avoid fixing some blankings to cause soil body landslide or dykes and dams slippage.
Claims (6)
1. lake dredging up method; Comprise desilt and dredge, mud transportation, stockyard processing, sludge solidification, tail water discharging; It is characterized in that: the first step, at first to the geology and geomorphology of lake and periphery and hydrological regime survey, confirm to build the position of dykes and dams and ait; In second step, the periphery in this position carries out ground to be handled, and sets campshed and joins together, builds up the hard-shell dyke that is higher than the water surface; In the 3rd step, fill out filtrate in the inwall throwing of campshed trap filtration beds is set; The 4th step, desilted and dredged in the lake, be stacked at nearby in the scope of hard-shell dyke trap, and the mud of desilting and dredging is added dehydration hardener; The 5th step, get the elevation that mud after the curing is increased peripheral dykes and dams, form ait and island Zhong Hu; The 6th step, the peripheral dykes and dams of ait along the limit bank protection, and the tree and the grass of plantation resistant mud.
2. a kind of lake dredging up method as claimed in claim 1 is characterized in that: select physical features higher in lake center, the position that ground is more steady sets a circle with vibrating hammer and is detained mutually to connect by sheet pile, pile and form campshed; At the inwall of campshed trap spread a layer of clay worker's cloth, one deck rubble, one deck coarse sand, throw in the outside of campshed trap and to fill out one deck coarse sand; Adopt the defeated mud ship of environment-friendly type desilting leaving 200 meters zones suction mud in addition of campshed, desilted and dredged in the lake; Through mud conveying pipeline mud is admixed 6% sludge dewatering and solidifying agent, be stacked in the scope of filtration beds trap; Get in the ait mud of dehydrating and curing and increase the elevation of peripheral dykes and dams; On ait, plant willow, metasequoia tree, plantation reed, wild rice stem, the stem or leaf of cattail, and on limit, all edges bank protection.
3. a kind of lake dredging up method as claimed in claim 1 is characterized in that: adopt the defeated mud equipment of environment-friendly type desilting 50 meters to 300 meters away from hard-shell dyke fetching earth in addition be.
4. a kind of lake dredging up method as claimed in claim 1 is characterized in that: dehydration hardener, adopt among cement, gypsum, lime, slag, flyash, sodium sulphate and the alum one or more, consumption be the mud mass percent 2%～30% between.
5. a kind of lake dredging up method as claimed in claim 1 is characterized in that: hard-shell dyke adopts the sheet pile that is " Ω " type or " S " type to connect and forms, and is provided with catching groove at the two ends of sheet pile, all is provided with drain hole at each face of sheet pile.
6. a kind of lake dredging up method as claimed in claim 1 is characterized in that: the sludge dewatering and solidifying agent comprises cement 28%, gypsum 10%, lime 11%, slag 35%, sodium sulphate 8% and the alum 8% of mass percent.
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| CN105149316B (en) * | 2015-07-03 | 2016-05-18 | 浙江理工大学 | The curing municipal sludge of a kind of use builds the landfill yard of bank and piles high compatibilizing method |
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| CN107162381A (en) * | 2017-07-31 | 2017-09-15 | 长江师范学院 | A kind of device for treating sludge and its method |
| CN107200461A (en) * | 2017-07-31 | 2017-09-26 | 长江师范学院 | A kind of process for treating sludge |
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| CN107200461B (en) * | 2017-07-31 | 2020-04-07 | 长江师范学院 | Sludge treatment method |
| CN107226597B (en) * | 2017-07-31 | 2020-07-14 | 长江师范学院 | Special reagent for sludge treatment and use method thereof |
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| CN109650551A (en) * | 2019-02-28 | 2019-04-19 | 湖北茂源水生态资源开发有限公司 | A kind of lakebed in ecology lake |
| CN110622823A (en) * | 2019-09-20 | 2019-12-31 | 中国科学院东北地理与农业生态研究所 | Construction method of substrate for recovering reed clumps in constructed wetland deep water area |
| CN110981128A (en) * | 2019-11-29 | 2020-04-10 | 浙江省疏浚工程有限公司 | Method for building wetland through sludge backfill |
| CN112095579A (en) * | 2020-08-21 | 2020-12-18 | 盐城工学院 | Method for forming ecological drainage in yard dredging sludge and quickly forming soil in deep sludge |
| CN112523160A (en) * | 2020-08-31 | 2021-03-19 | 济南金宇公路产业发展有限公司 | River water ecological management method |
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