Water supply for dredging
SUBSTANCE: invention relates to mining and can be used in dredging of valley and floodplain detritus. This method comprises construction of stream diversion channel, service pool for dredge and system of water treatment plants. Stream diversion channel is composed by natural bed in drag bank made at working the deposit in lengthwise direction with earth prism filling to inner slope of dredge bank. Extraction of mineral during stream diversion channel is carried out by asymmetric manoeuvring of dredge to ensure maximum cross-section area of dredge bank. Water level in service pool and water treatment plats is kept level with stream diversion channel water horizon.
EFFECT: higher environmental safety, decreased scope of works.
3 cl, 2 dwg
The invention relates to the mining industry and can be used in dredging the development of the valley and alluvial placers.
The invention is directed to improving the environmental cleanliness of mining operations and the establishment of effective dredging technology development placers.
Currently from placer deposits in Russia produced almost 30% of the gold. The share of dredging method development placers though reduced, but remains significant (>50%). The main reserves of sand placer deposits are concentrated in the valley and alluvial placers, having a sufficiently large width. Practicing these placers is a transverse, longitudinal-transverse and spiral passages drag. Water dredging work is performed primarily in closed or working schemes with wastewater in lagoons, created in the developed space.
The issues of enhancing the safety of mining operations currently very relevant and included in the list of priority directions of development of science and technology. The claimed method relates to the priority areas of "Technology of reducing the risk and consequences of natural and man-made disasters" and "Technology of environmentally safe mining and mining" [Alphabetical subject index to International the th patent classification in priority directions of development of science and technology / Ugino, Eviscerate, Sagranov. - M.: PATENT, 2008. - p.65, 110].
There is a method of recycling water supply dredging works, including the construction of russiatoday, the creation of technological reservoir and sump [Lichev V.R., Asinovsky L.N., Chikin, Y.M. Guide the selection and design of water supply systems, sewage and water treatment methods in the development of alluvial deposits. - Irkutsk, 1990. - P.24-25].
General characteristics similar to the claimed technical solution is the construction of russiatoday, the creation of process water and wastewater treatment facilities.
The disadvantage of analog is the need for the construction of russiatoday outside contour of stocks that leads, first, to increase the area of land allocations, secondly, requires significant additional costs, third, often leads to the rise of the bed of the river on the floodplain and significant seepage diversion of surface waters, including in direction of the drag section. And finally after completion of mining operations must work to restore the river channel, as nucleotomy on the ridges (slopes) are temporary structures and remediation must be filling.
There is a method of closed-loop supply with the creation of longitudinal dams embankment for insulation of process water and wastewater treatment. is from surface water [Leshkov VG Development of placer deposits. - M.: Izd-vo Mining book, 2007. - S-606, is, in].
General characteristics similar to the claimed technical solution is the abstraction of surface water from the area of the dredging works, the creation of process water and wastewater treatment facilities.
The disadvantages are the counterpart for the extra costs of landfilling floodwalls, increasing the area of land allocations, significant seepage leaks either from the river or from process water and wastewater treatment facilities, and finally the need for stream restoration in the reclamation process.
For the prototype accepted way of a closed water dredging works with carrying out river bed diversion channel, the creation of technological reservoir for Draghi and treatment facilities for wastewater [Leshkov V.G. Development of placer deposits. - M.: Izd-vo Mining book, 2007. - S-606, RIS, g].
Common features of the prototype with the claimed technical solution are carrying out river bed diversion channel, creating a process pond for Draghi and treatment facilities for wastewater.
The disadvantages of the prototype is the construction of russiatoday outside contour of stocks, a significant difference in water levels in RusRoute and technological reservoir and the sump, the need to return to the riverbed after the head of the deprivation of development of the reserves in telugulo part of the floodplain.
The claimed technical solution aimed at improving environmental cleanliness dredging works.
The technical result is to increase the environmental safety of the water supply dredging works by reducing the area of disturbed land and reduce the volume of hydraulic engineering works for water removal and restoration of the riverbed.
The technical result is achieved in that in the method of water dredging works described in claim 1 of the claims, including river bed diversion channel, creating a process pond for Draghi and treatment facilities for wastewater, according to the invention the river bed diversion channel is formed in the form of restored channel dredging in the sinus formed by the reserves longitudinal stroke, followed by a heaping of the prisms on the inner slope of dredging spoil.
During the development of the placer dredges educated in the process of dumping sinus between the piles and the wall of the open pit have a sufficiently large cross-section, allowing the pass of the river with a small flow rate, which eliminates erosion processes.
To prevent water exchange between the river and technological reservoirs, as well as reducing water erosion dredging dumps on the inner slope dumps slept excavation prism.
the increase culvert capacity dredging sinus (living section), what is important on large streams, the parameters of the sinus should be increased.
The technical result is achieved in that in the method of water dredging works described in paragraphs 1 and 2 of the claims, including the formation of river bed diversion channel in the form of restored channel dredging in the sinus formed by the reserves longitudinal stroke, followed by a heaping of the prisms on the inner slope dredging spoil, according to the invention the recess of minerals in the longitudinal course of conduct asymmetric maneuvering Draghi.
It is known that the method of extraction of minerals unbalanced maneuvering Draghi is used to reduce dilution and loss of sand in mihalovich the pillars, as well as to create favorable conditions for the construction of wodoodporne structures [Leshkov V.G. Development of placer deposits. - M.: Izd-vo Mining book, 2007. - S-656, RIS, in].
In the claimed technical solution of the asymmetric maneuvering solves another task and is used for expansion of dredging sinus.
With a significant drop in water levels in the river and in the technological and wastewater treatment ponds increase filtration flows in the direction of decline. When the filtration leaks from process water in the river may be exceeded the permissible level is ugrasena surface waters. So you want the maximum reduction in water exchange between the river and technological waters.
The technical result is achieved in that in the method of water dredging works described in paragraphs 1 and 3 of the claims, including the formation of river bed diversion channel in the form of restored channel dredging in the sinus formed by the reserves longitudinal stroke, followed by a heaping of the prisms on the inner slope dredging spoil, according to the invention the level of water in process water and wastewater treatment plants supported on the horizon of the water in RusRoute.
The water level is regulated by dams (wodoodporne dams, bridges.
Differences from prototype to prove the "newness" of the proposed method.
The unknown impact of signs, similar to the distinctive essential features of the proposed method, on the technical result consists in increasing the environmental security dredging works and the decrease in hydraulic works and achieved the claimed technical solution proves its compliance with the conditions of patentability "inventive step".
The invention is illustrated by drawings, where figure 1 shows a plan moves Draghi when testing two adjacent parcels polygon:
1 - outline of the first section of the polygon;
2 - the path of the WTO is on the disposal area;
3 - direction moves Draghi;
4 - dredging sinus;
5 - natural riverbed;
6 - rylott dredging in the bosom on the first segment;
7 - rylott (restored channel) dredging in the bosom on the second site;
8 - dam.
Figure 2 shows the cut generation across the longitudinal course Draghi unbalanced maneuvering:
Position 4 is the same as in figure 1.
9 - Eveline dumps;
10 pebble dumps;
11 - earth prism.
The way water dredging works is as follows.
Development of the first section begins longitudinal course Draghi along one of the paths 1. After completion of longitudinal travel within area 1 continues practicing the rest of the stocks in the contours of this area. As podvigina Draghi longitudinal motion on the inner slope evalnih 9 and 10 pebble dumps slept excavation prism 11, the overlapping dredging spoil and reducing their water erosion and seepage leakage of the generated russiatoday 6. After dumping ground prism 11 natural river channel 5 is put into 6, which is formed in the form of restored channel, i.e. calculated to permit maximum flood discharges 1% probability.
During the development of the diamond fields in the uprising last move Draghi along the opposite path first is the second portion of mash is longitudinal with the formation of dredging sinus in the form of the restored channel. This longitudinal stroke continues until the end of the second above section 2, followed by a heaping of the prism 11 on the inner slope dredging evalnih 9 and 10 pebble dumps. Then the river starts in the newly created rylott 7.
After completing the studies of the second longitudinal section of the course begins dredging the next section in the same order. The last section of the river starts in one ruslotto formed along the contour of the stock. Rylott the opposite path of the inventory can be used to collect surface water from lateral inflows and subsequent discharge to the river downstream of all mining area.
Dredging sinus along one of the paths stocks, which is formed in the form of restored channel and is calculated on a maximum 1% probability flow in the river to increase its throughput and living section of the water flow is formed asymmetrical maneuvering Draghi.
After development of the reserves of the longitudinal course of the dredge with the creation of dredging sinus with the necessary cross-sectional area are heaping of the prisms on the inner slope of dredging spoil. To do this, on the ridge of the dredging spoil bulldozer create a road for vehicles or forklifts. After that, dump trucks or pogruzodostavochnye overburden, who slept during the along the roads and created on the blade side of the formed russiatoday. At the final stage of the delivered overburden with dozer is created on the inner slope dredging spoil soil prism.
The cross-sectional area excavation prism will be 20-30 m2that is less than the sectional area of river bed diversion channels formed on the ridges of the valley with a maximum expenditure of the river more than 10-20 m3/s In the valleys wide enough placers maximum river flow are several tens to hundreds of cubic meters per second. Therefore, the proposed solution will significantly reduce the amount of hydraulic works water dredging works even without taking into account the work required for restoration of the riverbed in the process of reclaiming the traditional way of water.
To control the exchange of water between surface runoff (river) and technological reservoirs and treatment plants, the water level in RusRoute, technological and wastewater treatment ponds should be equal, that is regulated by dams on the edges, and transverse ridges.
1. The way water dredging works, including river bed diversion channel, creating a process pond for Draghi and systems of treatment sooruzheniya wastewater characterized in that the river bed diversion channel is formed in the form of restored channel dredging in the sinus formed by the reserves longitudinal stroke, followed by a heaping of the prisms on the inner slope of dredging spoil.
2. The method according to claim 1, characterized in that the recess of minerals during the formation of river bed diversion channel perform single-ended maneuvering Draghi ensuring maximum cross-sectional area dredging sinus.
3. The method according to claim 1, characterized in that the level of water in process water and wastewater treatment plants water supply dredging works to maintain the level of water in the river bed diversion channel.
SUBSTANCE: proposed method comprises drilling the vertical wells, charging the latter, placing the charges, short-delay blasting of said wells and selective excavation. Blasting of blocks is performed in bulk. Note here that all three dimensions of blasted block, i.e. width, length and height, are set irrespective of the position of contacts and the number of ore bodies. After block blasting, portion of shotpile is dumped over slope roof with working of the first pass over rock on the side of ore body hanging side. Depending on attitude of ore body in blasted block, selective working of productive bench is performed in two sub-benches with mining in layers.
EFFECT: decreased losses of ore and ore dilution.
SUBSTANCE: proposed method comprises the steps that follow. Top soil layer is removed to be preserves or to be transferred to territories to be reclaimed, loosening, loading and conveying stripped rock to make the waste dumps, dislodging, loading and coal transfer to storage and reclamation of dumps. Note here that seam weathered coal approaching the day surface is extracted and stored separately. Waste dumps are levelled to apply soil and weathered coal layers thereon. Produced layer is loosened with stripped rock and rolled.
EFFECT: higher efficiency.
SUBSTANCE: proposed method comprises opening of deposit by galleries at quarry unworked edge, working of deposit in blocks with excavation of minerals by chambers, release of crushed mineral to underground openings and bringing it to grass. Note here that deposit is developed by galleries at dividing unworked edge to horizons equal to height of production bench. Charges are laid in gallery blast-holes and wells. Cut opening is produced by blasting blast-hole and well charges of the gallery central group. Rock is excavated and loaded to carries via loading funnels. Blast-hole and well charges are blasted to force the deposit of the gallery flank groups to cut opening. Conical bank of blasted rock is formed, loaded and transported. Deposits of central and two flank directions are developed to isolate prior development zones by quality of mineral stock.
EFFECT: creation of working zone in central and two flank directions at unworked edge at selective working of deposits.
SUBSTANCE: invention relates to mining particularly to openworking of rocks. Zoning is adjusted by registration of changes in thrust and lift engine performances to tie the latter via bucket spatial position in digging cycle for registration of bench bottom quality, granulometric composition and shape of cut rock bulk at transition from near well space to gotten well space. Characteristics of bench bottom working are allowed for by changes in performances of thrust engine at the level of bench bottom. Rock granulometric composition is defined by changes in performances of lift engines at filling and retention of filled bucket. Bulk compactness is defined by changes in performances of lift engine at scooping height registration at transition from gotten near well space to gotten well space.
EFFECT: higher efficiency of zoning and quality of blasting.
SUBSTANCE: access ramp for trucks in open-pit mine combined with inclined safety berm of open-pit mine includes empty and loaded branches and additional ramps to safety berms of open-pit mine located on side slopes of ramp for trucks. Herewith, empty and loaded branches of access ramp for trucks are separated and located in different half-trenches the bases of which are inclined safety berms of open-pit mine replacing sections of horizontal safety berms of open-pit mine along path of ramp for trucks and interconnected by additional ramps for auxiliary equipment located on side slopes of half-trenches, and additional ramps connecting access ramp for trucks with safety berms of open-pit mine are located at both sides of it.
EFFECT: reduction of quarring costs due to simplification of works for final pit edge formation and reducing volume of excavation removal caused by its through cut for berm of ramp for trucks.
SUBSTANCE: proposed method comprises erection of sludge pond, opening and mining of quarry field. At quarry nonworking board bench located on the side of maximum ground water mark in quarry field contour erected is buttress anti-filtration shield, under the level of ground waters beyond the boundaries the prism of possible collapse of underlying bench, over the entire length of ground water layer. Note here that buttress shield height is defined from mathematical relationship.
EFFECT: lower capital and operating costs.
SUBSTANCE: proposed method comprises excavation of working trench, mounting of transport communications, working of quarry field, excavation of minerals and access rock by benches. Note here that quarry field development is varied out from centre to its flanks while after development of quarry field for angle α between working trench and transport communications to be defined from mathematical relationship. Access rock is dumped into internal dumps located between working trench and transport communications. After complete development of quarry field working trench is elongated and transport communications are installed, cycle being reiterated several times.
EFFECT: higher efficiency, lower costs.
SUBSTANCE: proposed method comprises stockpile filling of dumping site stages. Note here that dumping site stage comprising rocks of capping and pasty tails are laid separately towards each other. Note also that pasty tails are laid on slope side Note that stockpile filling of dumping site stages and pasty tails I performed to one horizontal level.
EFFECT: filling of dumping sire stages in single turn, pilling of pasty tails after ore dressing redistribution at inclined base.
2 cl, 1 dwg
SUBSTANCE: method involves stripping operations performed by longitudinal stripping cuts along the direct system with laying of overburden rock into external dump arranged on upper platform of a non-working open-pit side, at stock-piling of overburden rock to external dump in tiers that are formed along dumping front. Dumping front is arranged at a right angle to an upper edge of a non-working side of the open pit and aligned with movement direction of overburden rock from the working face of longitudinal stripping cut to their dumping place.
EFFECT: reducing overburden rock re-excavation volumes.
SUBSTANCE: proposed method comprises drilling of parallel rows of wells, charging them with explosives and their short-delay blasting. This short-delay blasting of radially arranged charges in membrane layers is performed as follows. First row of wells is blasted, the third one from the bench edge. Then, 1 row of wells is blasted with 25 ms delay while 2 rows of wells are last blasted with 50 ms delay. To locate the membrane layers, rock mass is photographed to define the radius of curvature of bench mining block slope by relationship with due allowance for acoustic stiffness of rocks. Weighted average layer-by-layer quantity of systematic fractures per the width of mining block coverage Wc is defined. Weighted average spacing between two adjacent systematic fractures is defined. Degree of crushing and line of resistance at bench bottom are defined. Sums of rock bed depths and strength factor (by Protodyakonov scale) are calculated. Rock strain rate, clamp factor, explosive potential energy and blast efficiency are defined.
EFFECT: maximum development of rock mass, decreased consumption of explosives, higher yield.
4 dwg, 1 tbl
SUBSTANCE: invention relates to the field of ecology, environment protection and rational nature management and can be used for purification of river water, climate regulation in drought and also contributes to creation of a reserve of fresh water for the economic and social needs of the population. The essence of the technical solution is that the water reservoirs with the depth of 2.5-3 m, the width of 120-150 m, the length of 250-280 m, the surface area of water of 3-3.5 ha are formed in interstream areas on the river banks at a distance of 150-200 m from the mainstream. The water reservoirs are connected to the river bed by input and take-out channels. At the bottom of the water reservoirs the zeolite-containing clay - irlites are placed with the layer of 10-15 cm.
EFFECT: method enables to reduce the level of pollution of river waters, to create optimal climatic conditions for human living, flora and fauna, the sustainable development of coastal ecosystems and the whole lowland interfluvial landscapes, while simultaneously providing reserve of ecologically clean fresh water for domestic, household and other needs of the population.
SUBSTANCE: in the method, damage is evaluated from absence of trees and shrubs at the bottom of a valley and the presence of native old-age tree strata on upper-lying slopes. Later - from the presence, at the bottom of the valley, of even-age, young trees and shrubs, and subsequently, with aging thereof, - from the numerical dominance of trees in the old age group over any other age group; and from the presence of mass damage to the bark and woody tissue on trunks of trees growing on the foot of the slop of the valley. The width of the zone of damage of the valley is measured from the distance between peripheral damaged trees on the cross-section of the valley; the height of damage on the valley sides is measured from the top level of damages on tree trunks. The date of the disaster is determined using the formula: n=n2-n1, where: n is the number of annual rings which corresponds to the number of years since the valley was damaged by the mudslide; n2 is the number of annual rings on a radius passing through undamaged parts of the tree trunk; n1 is the number of annual rings on a radius passing through the damaged area of the tree trunk.
EFFECT: method simplifies evaluation of hazardous natural phenomena when monitoring areas for construction and forming agricultural ecosystems in recreation.
SUBSTANCE: device includes an elastic cloth installed across the flow. The elastic cloth is made as meshed according to shape and size of the flow and is fixed to the frame. The frame is installed on a rotary crosspiece, which has a drive. At the same time the frame comprises a rotary axis parallel to the direction of the flow with the possibility of frame rotation with the elastic cloth perpendicularly to the direction of the flow and fixation of the frame in the necessary position. At the side part of the crosspiece there is a loading cart for removal of dirt.
EFFECT: increased quality of irrigating water treatment, simplified design and reduced energy intensity of treatment.
SUBSTANCE: device includes a manifold pipe having many holes made in its wall at a certain distance from each other, a suction pump, a suction pipe, one end of which is connected to the suction pump and an assembly of a suction head. The suction head assembly is connected to the other end of the suction pipe and is capable of moving in a sliding manner along the manifold pipe from one of its ends to the other. The suction head assembly includes a head section of the housing, which is spatially remote and connected to a rear section of the housing, which has a through axial hole interconnected with the suction pipe. Head and rear sections of the housing fill a considerable part of the manifold pipe during operation and form a suction zone between themselves of such length that at least one hole can be open at location of the suction head assembly at certain positions along the manifold pipe. The method is implemented by means of a device for removal of slurry and consists in installation at the bottom of a sediment tank or a pond of a manifold pipe, connection of the suction pump to one end of the suction pipe, connection of the suction head assembly to the other end of the suction pipe by means of a through axial hole in the rear section of the housing. After that, the suction head assembly is introduced into an open end of the manifold pipe. Besides, front and rear sections of the housing considerably fill the manifold pipe and form a suction zone between them of such length that at least one hole can be open in any position along the manifold pipe. The suction head assembly is moved through the through holes of the manifold pipe at subsequent passage of the working suction pump above holes in the manifold pipe wall.
EFFECT: improving slurry removal efficiency.
21 cl, 6 dwg
SUBSTANCE: method to raise a water level in small watercourses after dredging works includes erection of a retaining dam upon completion of dredging works. The main dam body is created from soil. At least one flexible concrete mat is arranged in the outer part of the dam. The height of dam is by 10÷80% less than the height of the dredged riverbed wall. The second version of the method includes erection of a cascade of retaining dam. The second dam of the cascade is erected by 0.1÷0.3 m below at the elevation from the sea level. To erect a retaining dam, dredging works are carried out in separate sections of the riverbed. The distance between sections is selected as equal to the width of the main dam body. Then the height of the main dam body is adjusted, and it is coated with a flexible concrete mat. The retaining dam comprises the main body. The outer part of the dam comprises at least one flexible protective mat. The flexible concrete mat comprises concrete blocks connected to each other row-by-row and within with a gap by flexible elements. The mat comprises an anti-suffosion element and/or elements for complete closure of gaps between all concrete blocks or between their part. The width of gaps between at least 75% of the blocks in the mat makes from 1 mm to 25 mm in the length of at least 80% of the dimensional length of blocks adjacent to each other. Concrete blocks have height from 50 mm to 350 mm.
EFFECT: raising water level in small watercourses after dredging works, simplified dam design, increased manufacturability of its creation, high extent of protection of a soil main body of the dam.
22 cl, 8 dwg
SUBSTANCE: method includes using a pulp from a water source bed for dam erection. At the same time to erect a dam they use pulp-filled tubes from semipermeable material of prismatic section, which are laid along the river bed. A sludge pond is arranged behind the dam. Coastal landscapes are recovered by cleaning of the water bed from anthropogenic bottom sediments, river water content increases, which protects against impact of high water and helps to develop a feed base for fishery. The method makes it possible to perform works regardless of landscape features. Degraded flood-plain lands gain stability, and it becomes possible to change them into a class of the ones suitable for agricultural activity.
EFFECT: protection of coasts and recovery of coastal landscapes of rivers.
FIELD: process engineering.
SUBSTANCE: proposed method comprises washout of sediments by water jets to carry fine fractions over by flow and strengthening waterway bottom by coarse fractions forming riprap. Velocities of washout and carryover sediments in continuous blow with stream are created by in-channel basin displacing in blow. Said in-channel basin is formed by device acting as water-retaining construction of variable geometry. Proposed method is implemented using the device composed of horizontal web with ballast arranged thereon connected with pressure web by ropes to make water passage there between and provided with balloons secured along said passage on said web and adjusted by filler. Opening of said passage is adjusted by moving web. The latter is secured by stabilising rings to ropes, pressure web and directly to balloon and horizontal web by ropes via said guide rings. Device displacement in blow direction id effected by varying balloon filler volume. Said balloon has inner rope diaphragm tightening it above central part and is installed on horizontal web at the point of fastening to control rope guys locating the device on waterway bed.
EFFECT: higher efficiency of washout.
4 cl, 8 dwg
SUBSTANCE: cable assembly includes a frame-lifting and swing winches with programmable winding of ropes onto drums rotated with angular speed, which is directly proportional to lengths of wound cables, blocks on the frame-lifting boom of the suction dredge and life ropes with roller carriages arranged on canal shores in parallel to its longitudinal axis. The device is also equipped with a follower cable, branches of which via blocks on the frame of the snapper and the frame-lifting boom of the suction dredge are connected to the frame-lifting winch arranged in the form of two drums arranged on one shaft synchronised with a reversible programmable drive, and are fixed to life cables perpendicularly to the longitudinal axis of the canal with the help of roller carriages. Roller carriages are equipped with fixators, with which roller carriages of swing winches are also equipped.
EFFECT: by control of snapper position in a canal section in connection with suction dredge displacement along the canal axis, the specified curvilinear underwater cross section of the canal is formed, which corresponds to the stable bed of the canal, and production of works is simplified.
SUBSTANCE: road 5 is cleaned for vehicles. Temporary weird 9 is arranged upstream of pond source to retain inflowing water. Then, water is drained from pond via flat gate of gatewell 3 or by siphon piping 10. As water level decreases and for uniform laying of ice 11 on silt 12 nearby bank, through saw cuts 13 are made on ice 11 by chainsaw depending on water depth. Note here that saw cut length equals 1 m and spacing between saw cuts varies from 5.0 to 10.0 m, distance ℓ from bank makes where H is water depth, δ is ice thickness, while α is bank slope. Water drained from pond, ice 11 is uniformly laid on slit 12. Then, slit 12 of sapropel is excavated. Cleaning is started from pond source top 8. Chainsaw is used to cut ice lumps. Mechanical shovel 14 loads slit on dump-truck to deliver on platform for it to be frozen-defrosted.
EFFECT: higher efficiency of cleaning.
2 cl, 4 dwg
SUBSTANCE: method includes erection of bulkhead structures 4 with discharge openings 5 at river bed 1. At that water is accumulated in ponds and water reservoirs at level higher than location of bulkhead structures 4 by opening of discharge openings 5 in structures 4. Bulkhead structures 4 are created by ice-cakes freezing in winter period in pits 3 made in silty areas 2 in autumn. Space under ice-cake serves as discharge opening 5. At that ice-cake 4 cis shifted by water flow along the stream until it thrusts into soil and rises at bottom height. Ice-cake 4 creates water accumulation in volume and water head down-stream. At areas where river made meanders pit 3 is made with entry to side of river bed straightening with calculation of intense flow channel closure by ice-cake 4 towards old river bed. Straightened section will create cut-off meander 7.
EFFECT: method allows recovery of natural river bed, preservation of ichthyofauna and reduce consumption of resources.
FIELD: hydraulic engineering, particularly for cleaning river, channel beds and other structures of sediments.
SUBSTANCE: method for bed cleaning by sequential transversal bulldozers movement involves coarse planning river bed with the use of bulldozer with flat blade; cleaning river bed by moving bulldozers having comb-like blades with different gaps between knives thereof and forming afflux dams along river banks, wherein river bed cleaning is initially carried out by bulldozers having greater gaps between knives of comb-like blades and then by bulldozers having lesser ones. Dam bodies are formed by sequential moving bulldozers with comb-like blades so that upstream dam face comprises coarse fractions, dam top and downstream face thereof has fine fractions. After that silt free from coarse fractions are moved by bulldozers with flat blades to river bed axis to provide following carry-over thereof by high flood.
EFFECT: increased efficiency and economy.