CN102733349B - 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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- CN102733349B CN102733349B CN201110096462.4A CN201110096462A CN102733349B CN 102733349 B CN102733349 B CN 102733349B CN 201110096462 A CN201110096462 A CN 201110096462A CN 102733349 B CN102733349 B CN 102733349B
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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 lake dredging up method, be 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, the a large amount of industry of lake periphery and sanitary sewage are difficult to completely controlled, cause bed mud in lake to deposit serious, in bed mud, pollutant load generally exceeds standard, and ecological environment is damaged, and water body goes from bad to worse, aggravation along with water pollution, water quality cannot meet normal water supply requirement, and the sudden water quality deterioration events such as " blue algae bloom ", " Kuroshio " even occur, and is directly threatening regional water supply and ecological safety.Being deposited in a large number in lake of pollutant and rubbish, accumulates over a long period, and gradually forms more and more thicker mud layer, and this not only makes lakebed improve, and storage capacity reduces, and contaminated environment, affects traffic, and the function of controlling flood and draining flooded fields is deeply influenced.In meeting flooding in flood season, jeopardize dyke, cause floods.
For improving Water Environment In Lakes quality, at the bottom of removing lake, mud is to remove to pollute endogenous unique method.On the basis that pollutant discharges in effectively suppressing bed mud, safety is excavated polluted bed mud, improves water body self-purification ability, thereby creates conditions for environment of Lake region reparation.Lake alluvial is administered and has been become a urgent problem.
Urban lakes is carried out to desilting, restrictive condition is many, influence basin is large, influence factor is many, need process and take precautions against the aspects such as secondary pollution at desilting mode, means of transportation, stockyard selection, mud mummification, tail water and be in optimized selection, determine the resolution that is applicable to characteristic of city.First the problem running into is to clear out the mud coming not have local placement, and the processing of a large amount of mud also more and more becomes a stubborn problem.Traditional processing method is: prepare a low-lying land that value is less, the mud that desilting is produced is poured on this plot in advance, and the earth after natural mummification can be used as agricultural soil and uses.Along with the pollutant in current bed-silt is more and more, concentration is more and more higher, even some pollutant toxicity is huge, traditional process for treating sludge is unsatisfactory, soil and the water source on ground stacked in pollution that can be serious, add often cacodorous gas with foreign flavor of mud, make to stack the air pollution of ground periphery.If the West Lake in Hangzhou is clearing out on the hillside that mud is deposited in lakeside, Taihu Lake is clearing out the periphery that mud is deposited in Taihu Lake, and one rains heavily, and mud is got back in lake and gone again.Next problem running into is in desilting process, also to cause the pollution of water body, clears out mud and is deposited in lakeside, cannot process in time the secondary pollution also causing.
Summary of the invention
The present invention is directed to this problem, the new comprehensive treatment scheme proposing on the basis of a large amount of early-stage Study.When object is to meet desilting function, build dykes and dams and ait, 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 discharge, it is characterized in that: the first step, first to the geology and geomorphology of lake and periphery and hydrological regime survey, determine to build the position of dykes and dams and ait; Second step, the periphery in this position carries out ground processing, sets campshed and joins together, builds up the hard-shell dyke higher than the water surface; The 3rd step, arranges filtration beds at the inwall throwing filtrate of campshed trap; The 4th step, desilts and dredges to lake, is stacked at nearby in the scope of hard-shell dyke trap, and the mud of desilting and dredging is added to dehydration hardener; The 5th step, gets the elevation that mud after solidifying is increased periphery dykes and dams, forms ait and island Zhong Hu; The 6th step, along limit bank protection, and plants tree and the grass of resistant mud at the periphery dykes and dams of ait.
The described exploration to lake and periphery is in order to find and determine the position of construction dykes and dams and ait.General Requirements physical features is higher, and base stabilization near the waters that needs dredging desilting, meets overall program distribution requirement as far as possible.The physical and chemical index of geology and geomorphology, hydrological regime, silt is investigated simultaneously.
Described periphery ground is processed, and setting campshed is in order to build up stable dykes and dams, is unified into together between campshed, supports mutually, and trap becomes man-made island or the artificial peninsula of various shapes.Hard-shell dyke adopts the sheet pile that is " Ω " type or " S " type, and connection forms, and at the two ends of sheet pile, is provided with catching groove, and padlock, supports each other mutually.So that join together between sheet pile.At each face of sheet pile, be provided with drain hole.
Described filtration beds is, in the inner side of sheet pile trap, one deck material for core is 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 determine according to the physical and chemical index of silt.
Described dredging desilting can adopt the defeated mud equipment of environment-friendly type desilting, bury pipe conveying equipment or Suction Dredger, and the earth in lake is dredged, and is stacked in the scope that duricrust sheet pile circle puts.Dredging desilting position should not from dykes and dams too close to, should be according to dykes and dams height, be generally selected in beyond 50 meters to 300 meters, dykes and dams and fetch earth.When dykes and dams height is low, choosing gets the small value, and chooses large value when highly high.In order to avoid affect the stable of dykes and dams.
Described dehydration hardener, one or more among employing cement, gypsum, lime, slag, flyash, sodium sulphate and alum, proportioning and used in amounts are analyzed the composition of mud, according to the physical and chemical index of mud, determine.Generally be mud mass percent 2%～30% between.
The described elevation of increasing periphery dykes and dams, should calculate the quantity of sand and mud of 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, get the silt in lake in island to periphery, increase periphery dykes and dams elevation.At important building thing position, carry out ground and process, in the position that need to do harbour, bridge and road, perform planning reserved.
Described plantation and be applicable to local growing plants flowers and plants along planting some on bank protection Shi island, limit for improveing soil and beautifying the environment, is done environmental protection and the ecological homeostasis well simultaneously.
Good effect of the present invention:
Due to adopting the position periphery of building dykes and dams and ait to carry out ground processing, set campshed and join together, build up fast the stable hard-shell dyke higher than the water surface.
Owing to adopting the inwall in campshed trap that filtration beds is set, mud is carried with pipeline, is stacked at nearby in the scope of hard-shell dyke trap, has shortened the transport distance of mud.Can not build island because of desilting and cause secondary pollution, affect the water quality in whole lake.
Owing to having added dehydration hardener, make silt consolidation fast, intensity is large, has shortened the improvement duration in lake.
Because lake has obtained the comprehensive regulation, build up wetland park, obtain tract resource.Balance is ecological, beautifies the environment.
The present invention one do not take up an area, two do not transfer the pollution thing, three reduced investments, four many features 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 after solution desilting, lake water is had a relapse, makes lake obtain the comprehensive regulation, achieves many things at one stroke.Administer and beautify the practicable good method in lake.
Accompanying drawing explanation
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 ait plan view, Tu6Wei ait partial section.Comprise: pile core (1), pile are buckled (2), sheet pile (3), pile (4), from yoke plate stake (5), hero, buckled (6), 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).
The specific embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1: lake in certain city, city, the lakebed thick mud that deposited.In mud, contain a large amount of pollutants, its pollution and again suspension effect are the major reasons of lake water pollution.Mud alluvial, lake water is rotten, and lake appearance is dwindled, and bogginess is serious.Have to make a decision to have renovated, but stacking mud wants land occupation, contaminated environment; Transportation mud is messy, pollutes road; Sludge landfill cost consumes huge, and recycling sludge is processed, easier said than done.Problems are perplexing the improvement in lake always.
Resolution of the present invention comprises that stockyard is selected, campshed sets, builds dykes and dams, desilts and dredges, slurry conveying by pipeline, dehydrating and curing, plantation bank protection, it is characterized in that: in lake center, select physical features higher, the position that ground is more steady, sets a circle with vibrating hammer and by sheet pile, pile, is buckled mutually to connect and form campshed; At the inwall of campshed trap spread a layer of clay work cloth, one deck rubble, one deck coarse sand, at the outside of campshed trap throwing one deck coarse sand; Adopt the defeated mud ship of environment-friendly type desilting to inhale mud in the region of leaving beyond 200 meters of campsheds, desilted and dredged in lake; Through mud conveying pipeline, mud is admixed to 6% sludge dewatering and solidifying agent, be stacked in the scope of filtration beds trap; Get in ait the mud of dehydrating and curing and increase the elevation of periphery dykes and dams; On ait, plant willow, metasequoia tree, plantation reed, wild rice stem, the stem or leaf of cattail, and at limit, all edges bank protection.When desilting and dredging, build ait.
In lake center, selecting stockyard as ait position, is the equidistant of mud conveying pipeline (10) in order to desilt and dredge, and to reduce downtime, improves transfer efficiency.That physical features, ground, defeated mud distance, a plurality of factors optimizations of programming and distribution are determined.
With vibrating hammer, set the campshed of circle all-in-one-piece circle in parallel, as shown in Figure 5; Campshed is detained mutually to connect by sheet pile (3), pile (4) and forms, as shown in Figure 3; Pile (4) has two kinds of two interface piles and four interface piles, middlely for pile core (1), limit are provided with two or four piles, buckles (2), sectional view as shown in Figure 1 and Figure 2; Sheet pile (3) is that " Ω " type, each face of elongating are provided with drain hole (8).
Filtration beds (13) selects geotextiles, rubble, coarse sand as filtrate; Also can set two-layer campshed, filtrate is positioned between two-layer campshed, build up the hard-shell dyke (12) higher than the water surface.
At the outside of campshed trap some coarse sands of throwing, both as suppressing layer (18), stablized dykes and dams, can compress periphery mud again, weaken it and pollute and suspension effect again.
Adopt the region of the environment-friendly type defeated mud ship of desilting (9) beyond bank protection circle (15) scope to inhale mud, and with the mud conveying pipeline (10) sealing, can not cause the pollution in waters.Lake is dredged, mud (17) declines, through mud conveying pipeline (10), mud is stacked in the scope of hard-shell dyke trap, hydraulic reclamation layer (20) forms nature inner slope (11), the interior water surface (19) precipitates at leisure higher than the outer water surface (16), mud, and the clear water of process filtering layer (13) is expelled back in lake.Because the mud layer in construction period hard-shell dyke (12) and the water surface (19) are all higher than outside hard-shell dyke (12), form a tension force from inside to outside, the campshed joining 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 different variation in position that the consumption of sludge dewatering and solidifying agent can fill according to mud.
Get in ait the mud of dehydrating and curing and increase the elevation of periphery hard-shell dyke (12), in ait, set up island Zhong Hu (14), also for administer stockyard is provided later; Ait need be built the position of pavilions, terraces and open halls and road and bridge can carry out precompressed and ground processing.Hu Zhongyou island like this, Zhong You lake, island, lake is just more beautiful.
On island, plant willow, metasequoia seeds reed, wild rice stem, the stem or leaf of cattail and be the tree of resistant mud and the grass of resistant mud.Plant absorbs ammonia, the nitrogen growth in mud, and the chemical energy in mud changes into biomass energy, realizes recycling sludge.In the periphery dykes and dams plantation on island and along limit bank protection.Lake dredging up is made island, has solved bogginess problem, has increased water retention capacity, increases land resources, builds up wetland park.Save soil, cost saving, saves time.
Embodiment 2: the water source of the water works in so-and-so Hu Weimou city, and owing to being subject to for a long time the normal erosion of upland water, two sides, river course are constantly by erosion, and soil erosion, accumulates over a long period, the lakebed more and more thicker mud layer that gradually deposited.This not only makes riverbed improve, and lake holds reduces, and contaminated environment, affects traffic, and in meeting flooding in flood season, jeopardizes dyke, causes floods.The engineering of desilting and dredging in the past, stacks the mud of dredging desilting in lakeside, once the mud of the lakeside of raining, get back in lake, always clear and become silted up, and has become silted up and clear.Administer engineering and cure the symptoms, not the disease often, engineering efficiency is lower.
Resolution of the present invention is substantially the same manner as Example 1, it is characterized in that: at the periphery of determining the position of building dykes and dams and ait, plug from yoke plate stake (5), from yoke plate stake (5) as shown in Figure 4, the hero button (6) that two ends are provided with and female button (7) mutually button connect; At the inwall from yoke plate stake (5) trap, one deck polypropylene filter material is set, forms filtering layer (13); The mud of being desilted and dredged in lake is stacked in the scope of filtering layer (13), from minimum position, adopts thin layer wheel to add, placement in layers, and balanced rising, lift height is controlled at 0.2～0.5 meter.Through repeatedly piling to build, reach design altitude.Avoid fixing some blankings and cause soil body landslide or dykes and dams slippage.
Claims (5)
1. a lake dredging up method, comprise desilt and dredge, mud transportation, stockyard processing, sludge solidification, tail water discharge, it is characterized in that: the first step, first the geology and geomorphology of lake and periphery and hydrological regime are surveyed, determine the position of building dykes and dams and ait; Second step, the periphery in this position carries out ground processing, sets campshed and joins together, builds up the hard-shell dyke higher than the water surface; The 3rd step, arranges filtration beds at the inwall throwing filtrate of campshed trap; The 4th step, desilts and dredges to lake, is stacked at nearby in the scope of hard-shell dyke trap, and the mud of desilting and dredging is added to dehydration hardener; The 5th step, gets the elevation that mud after solidifying is increased periphery dykes and dams, forms ait and island Zhong Hu; The 6th step, along limit bank protection, and plants tree and the grass of resistant mud at the periphery dykes and dams of ait.
2. 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 fetching earth in addition from 50 meters to 300 meters of hard-shell dykes.
3. a kind of lake dredging up method as claimed in claim 1, is characterized in that: dehydration hardener, adopt one or more among cement, gypsum, lime, slag, flyash, sodium sulphate and alum, consumption be mud mass percent 2%～30% between.
4. a kind of lake dredging up method as claimed in claim 1, is characterized in that: hard-shell dyke adopts the sheet pile connection that is " Ω " type or " S " type to form, and at the two ends of sheet pile, is provided with catching groove, at each face of sheet pile, is provided with drain hole.
5. a kind of lake dredging up method as claimed in claim 1, is characterized in that: sludge dewatering and solidifying agent, comprises cement 28%, gypsum 10%, lime 11%, slag 35%, sodium sulphate 8% and the alum 8% of mass percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110096462.4A CN102733349B (en) | 2011-04-15 | 2011-04-15 | Method for de-silting lake and constructing lake center island |
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| CN201110096462.4A CN102733349B (en) | 2011-04-15 | 2011-04-15 | Method for de-silting lake and constructing lake center island |
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| CN102733349A CN102733349A (en) | 2012-10-17 |
| CN102733349B true CN102733349B (en) | 2014-10-15 |
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Cited By (1)
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| CN104846833A (en) * | 2015-04-24 | 2015-08-19 | 华能伊敏煤电有限责任公司 | Backfilling hardening method for open pit ore face sludge |
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| CN107162381B (en) * | 2017-07-31 | 2020-08-21 | 长江师范学院 | Sludge treatment equipment and method |
| CN113557334A (en) | 2018-09-04 | 2021-10-26 | 湖泊修复解决方案公司 | Lake restoration system and method |
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| 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 |
| CN113045157A (en) * | 2020-10-26 | 2021-06-29 | 无锡德林海环保科技股份有限公司 | Sedimentation type sludge in-situ treatment device and method |
| CN115113228B (en) * | 2022-05-09 | 2023-10-24 | 江苏省水利科学研究院 | Method for detecting return-to-polder and lake engineering based on geographic information technology |
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