CN111648425A - Construction process for sand mining in high-compactness high-impurity-content water area - Google Patents
Construction process for sand mining in high-compactness high-impurity-content water area Download PDFInfo
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- CN111648425A CN111648425A CN202010540063.1A CN202010540063A CN111648425A CN 111648425 A CN111648425 A CN 111648425A CN 202010540063 A CN202010540063 A CN 202010540063A CN 111648425 A CN111648425 A CN 111648425A
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- sand
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- washing
- water area
- cutter suction
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- 239000004576 sand Substances 0.000 title claims abstract description 270
- 238000010276 construction Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000005065 mining Methods 0.000 title claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 75
- 238000012216 screening Methods 0.000 claims abstract description 69
- 238000000605 extraction Methods 0.000 claims abstract description 29
- 238000007667 floating Methods 0.000 claims abstract description 23
- 239000012535 impurity Substances 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 238000012546 transfer Methods 0.000 claims description 7
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 18
- 239000002689 soil Substances 0.000 description 11
- 238000009412 basement excavation Methods 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/92—Digging elements, e.g. suction heads
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/92—Digging elements, e.g. suction heads
- E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
- E02F3/9225—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel with rotating cutting elements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F7/00—Equipment for conveying or separating excavated material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F7/00—Equipment for conveying or separating excavated material
- E02F7/10—Pipelines for conveying excavated materials
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The invention relates to a construction process for sand mining in a water area with high compactness and high impurity content. The method comprises the following steps of (1) preparing for construction; (2) a step of positioning a cutter suction dredger; (3) the step of placing the screening sand washing platform and connecting the self-floating pipeline with the cutter suction dredger; (4) a step of starting sand extraction of the cutter suction dredger; (5) screening impurities and washing sand by a screening and washing sand platform; (6) carrying out berthing and loading on the sand barge; (7) a sand barge conveys a sand source to a sand unloading position and carries out sand unloading; (8) and (5) repeating the steps (4) to (7) to carry out continuous sand production operation. Compared with the existing sand mining process, the process gives full play to the working characteristics of the cutter suction dredger facility, solves the defects of the existing sand mining process, simultaneously realizes the screening and sand washing treatment of the sand source, and improves the quality of the sand source.
Description
Technical Field
The invention belongs to the technical field of dredging, and particularly relates to a construction process for sand collection in a water area with high compactness and high impurity content.
Background
The offshore sand production construction is used for obtaining a sand source for land reclamation. The existing sand production construction is usually carried out by adopting a sand suction boat, specifically: in the traditional sand extraction process, the end part of a suction pipe is vertically lowered by a sand suction ship and inserted into the surface layer of sandy soil, water is sucked by a centrifugal pump, pressurized and then sprayed and washed (called as jet flow) through a nozzle to obtain original soil, and then mortar is sucked into a sand cabin by a suction pump to carry out screening and washing operation. The process adopts the principle of hydraulic flushing and suction, and has weaker soil breaking capacity, so the sand suction boat must find an area with loose soil quality and thicker sand layer, the suction pipe is deeply buried to the bottom of the sand layer, the collapse effect of the loose sand is utilized to ensure that the suction pipe can continuously suck sand at a fixed point, and a sand pit can be formed after construction. If the sand compactness is higher, the sand layer is thinner or the sand layer is unevenly distributed, the construction efficiency of the sand suction boat is greatly influenced.
The existing sand suction ship sand extraction process is characterized in that: (1) fixed-point sand extraction requires a thick sand layer, and if the sand layer is discontinuous, frequent ship stopping and sand finding are required; (2) the construction is carried out by adopting a high-pressure flushing mode, only the soil with lower compactness can be exploited, and the opening is easy to block when the sundries in the soil are more; (3) the sand and soil with the depth of-5 m to-20 m can be dug only under the limit of barge draught and sand suction ship digging capability; (4) the wind wave resistance of the wind-resistant cable is low; (5) the sand is mined and shipped on site, and the remote conveying capacity is not available; (6) and the sand is sucked at fixed points by a hydraulic flushing mode, so that accurate construction cannot be realized.
The characteristics also correspond to the defects of the sand mining construction process: firstly, the sand suction boat has poor characteristics, weak wind and wave resistance and small draft depth, so that the sand extraction construction is difficult to continuously carry out and a sand source is wasted; secondly, when the sand suction boat is used for sand extraction construction, the soil quality of the sand extraction construction is limited, and the sand suction boat is only suitable for soil quality construction with low compactness, so that the application scene is limited, the boat needs to be frequently stopped to find a sand source, and the sand extraction construction efficiency is influenced; moreover, the sand suction boat does not have the capability of conveying a sand source, can only be loaded on site in a fixed-point sand suction mode and conveyed to a loading platform or a specified position after the boat is full, and cannot realize continuous sand production.
In some water areas, sand layers are not uniformly distributed, the sludge covering layer is thick, dredging sundries such as stones, hard clay and the like poured by earlier construction units are distributed on the surface of the covering layer of the sand extraction area in different degrees, part of the dredging sundries are sunk and embedded into the sludge layer, sand layers with different thicknesses are distributed below the upper covering layer, the compactness is high, and the sand layers are similar to iron plate sand and difficult to break.
Meanwhile, a cutter suction dredger is generally equipped at a project construction site. The cutter suction dredger is dredging equipment commonly used in dredging construction, is strong in wind and wave resistance, is provided with a positioning steel pile system, can be used for parking construction, is provided with an intelligent excavating system, can realize fixed-point excavation and is large in excavating depth, and is generally provided with a powerful dredge pump and pipeline facilities, so that slurry obtained by excavation can be remotely conveyed through a pipeline.
Therefore, it would be a viable solution to apply cutter suction dredger equipment to offshore sand production construction processes. Considering that a sand source obtained during sand production in a water area with high impurity content contains a large amount of impurities and cannot be directly put into a project for use, the collected sand source is generally required to be further processed to be used as a qualified sand source. At present, a sand mining process based on a cutter suction dredger does not exist, and the collected sand source is difficult to meet the project construction requirements, so that the development and design are needed to be carried out according to the specific situation of offshore sand mining.
Disclosure of Invention
The invention provides a construction process for sand mining in a water area with high compactness and high impurity content for solving the technical problems in the prior art, which fully exerts the working characteristics of a cutter suction dredger, solves the problems of the sand mining process of the existing dredger, and simultaneously further processes the obtained sand source to improve the quality of the sand source so as to meet the requirements of project construction.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a construction process for sand mining in a water area with high compactness and high impurity content comprises the following steps of (1) construction preparation; (2) a step of positioning a cutter suction dredger; (3) the step of placing the screening sand washing platform and connecting the self-floating pipeline with the cutter suction dredger; (4) a step of starting sand extraction of the cutter suction dredger; (5) screening impurities and washing sand by a screening and washing sand platform; (6) carrying out berthing and loading on the sand barge; (7) a sand barge conveys a sand source to a sand unloading position and carries out sand unloading; (8) and (5) repeating the steps (4) to (7) to carry out continuous sand production operation.
The invention has the advantages and positive effects that: compared with the existing sand extraction construction process of the sand suction dredger, the sand extraction construction process of the sand suction dredger fully exerts the working characteristics of the cutter suction dredger facility on the project site, and solves the defects of the existing sand extraction construction process of the sand suction dredger. Firstly, the cutter suction dredger has strong stability and strong wind wave resistance, so the process of the sand mining construction process is more stable and controllable. The cutter suction dredger can move to collect sand within a sand collection point range on a large scale, the productivity is not influenced in the moving process, the requirements on the thickness and the continuity of a sand layer are low, namely the condition of the sand layer of the sand collection point is not selected, the adaptability is stronger, a sand source of the sand collection point can be fully collected, and waste is avoided. Because the cutter suction dredger equipment is provided with the intelligent integrated reamer system, any soil in weathered rocks can be excavated, sundries are cut up when entering the high-speed reamer system, the opening is not easy to block, the sand extraction process is smoother, and the recovery ratio of a sand source is improved. The construction depth of the cutter suction dredger is far greater than that of the existing sand washing ship, so that a sand source at a deeper position can be obtained, the sand extraction rate is further improved, the total amount of the sand source obtained in unit time is far greater than that of the existing dredger equipment, and the economical efficiency of sand extraction construction is improved. Because cutter suction dredger adopts the piling bar to carry out accurate location, control the reamer gesture through intelligent excavation system, can carry out accurate excavation to the section under water, the sand source high-usage can satisfy construction tasks such as sand production and harbor basin, foundation ditch excavation in step, practices thrift investment cost. Moreover, the cutter suction dredger has strong pumping capacity to the slurry, so that the collected slurry containing a sand source can be remotely conveyed to a specified position, intermediate links are reduced, and the loss of sand is reduced. Moreover, the sand mining construction process realizes the operation of on-line screening and sand washing of the collected sand source, removes impurities in the sand source, reduces the mud content in the sand source, improves the quality of the sand source and meets the construction requirements.
Preferably: measuring a construction water area and performing geological survey in the step (1) to determine a specific sand extraction point; self-floating pipelines are arranged at sea.
Preferably: and (3) in the step (2), the cutter suction dredger sails to a sand extraction point, the lower anchor is fixed in the construction water area range, and the cutter suction dredger and other ships need to reserve enough safety distance.
Preferably: the screening and sand washing platform in the step (3) comprises a ship facility, and a screening device and a sand washing device which are installed on the ship facility; the screening sand washing platform sails to the position near a sand extraction point, is anchored and fixed in the construction water area range, and is reserved with enough safety distance with other ships.
Preferably: and (4) directly conveying the slurry obtained by the cutter suction dredger through cutter suction dredging construction to a screening device of a screening sand washing platform through a self-floating pipeline.
Preferably: and (5) communicating the screening tank of the screening device of the screening sand washing platform with the sand washing tank of the sand washing device, and enabling the screened mud to enter the screening tank and then enter the sand washing tank.
Preferably: and (6) the sand barge can berth and install a barge platform after receiving the command issued by the dispatching, the sand barge runs according to the established entrance and exit route, and the anchoring boat assists in berthing.
Preferably: and (6) the screening and sand washing platform is provided with a transfer conveyer belt for receiving the sand source after sand washing from the sand washing device, and the transfer conveyer belt is loaded to a sand barge berthed at the side direction of the screening and sand washing platform.
Preferably: and (7) when the sand barge arrives at a sand unloading place for sand unloading, the sand unloading conveyer belt of the sand barge conveys the sand source to another screening device for secondary screening treatment.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are described in detail.
The construction process for sand mining in the water area with high compactness and high impurity content comprises the following steps.
(1) A step of construction preparation;
in the step, measuring and geological surveying a construction water area, and determining a specific sand extraction point; self-floating pipelines are arranged at sea.
The self-floating pipeline (also called mud discharge pipeline) is arranged according to engineering characteristics and performance conditions of a construction ship (cutter suction dredger).
Two groups of ships with length and diameter of about 180m are arranged according to the type and the number of the ships to be thrown into the ship
The self-floating pipeline is used as a slurry conveying pipeline (also called a sludge discharge pipeline). The self-floating pipeline is a single self-floating pipe with the length of 11.8m and is connected with the self-floating pipe through flanges. The total length of the self-floating pipeline 117m is formed by 15 sections of self-floating pipes. Specifically, the self-floating pipeline is assembled on the land by matching two excavators and manpower, and after the assembly is completed, the self-floating pipeline is dragged into water by matching a land machine and an anchor boat, and the anchor boat is dragged to a specified water area.
(2) A step of positioning a cutter suction dredger;
in the step, the cutter suction dredger sails to a sand extraction point, the anchor is fixed in the construction water area range, and the cutter suction dredger and other ships need to reserve enough safety distance.
The cutter suction dredger has self-navigation capability, and after the dredger runs to a specified place, the construction anchor anchors the dredger in a water area range of a sand extraction point. And then, the positioning steel pile of the cutter suction dredger descends and is inserted into an underwater soil layer to further position the ship.
(3) The step of placing the screening sand washing platform and connecting the self-floating pipeline with the cutter suction dredger;
in the step, the screening and sand washing platform comprises a ship facility, and a screening device and a sand washing device which are arranged on the ship facility; the screening sand washing platform sails to the position near a sand extraction point, is anchored and fixed in the construction water area range, and is reserved with enough safety distance with other ships.
Specifically, the screening and sand washing platform comprises a ship facility, a screening tank and a sand washing tank are arranged on the ship facility, inner cavities of the screening tank and the sand washing tank are communicated, a screening device is installed in the screening tank, and a sand washing device is installed in the sand washing tank. Furthermore, the screening device comprises an obliquely arranged screening screen plate, the peripheral edge of the screening screen plate is fixedly connected with the inner wall of the screening pool, and the front part of the screening screen plate is provided with a left slag discharge pipeline and a right slag discharge pipeline; the sand washing device comprises a driving rotary roller and a driven rotary roller, a sand washing conveying belt is arranged between the driving rotary roller and the driven rotary roller, a plurality of fixing blocks are arranged on the surface of the sand washing conveying belt, a plurality of sand hoppers are fixedly arranged on the fixing blocks, and the sand washing device further comprises a sand washing motor for driving the driving rotary roller to rotate.
After the pipeline is adopted for screening the sand washing platform and the cutter suction dredger is connected, the cutter suction dredger can blow clean water through the pipeline firstly, the operation can clean the inside of the self-floating pipeline, and the self-floating pipeline is checked to determine whether a problem exists.
(4) A step of starting sand extraction of the cutter suction dredger;
in the step, slurry obtained by the cutter suction dredger through cutter suction dredging construction is directly conveyed to a screening device of a screening sand washing platform through a self-floating pipeline.
The sand extraction construction of the cutter suction dredger is the same as the cutter suction dredging construction mode of the existing cutter suction dredger, specifically: the cutter suction dredger transfers the front-end bridge and the reamer system to a specified depth, swings left and right, and carries out sand mining operation in a layering and striping mode, the reamer system can rapidly crush sand and impurities, the underwater pump forms negative pressure vacuum in the sand suction pipe, and mixed mortar is sucked into the pipeline system and conveyed along the self-floating pipeline.
(5) Screening impurities and washing sand by a screening and washing sand platform;
in the step, a screening tank of a screening device of the screening sand washing platform is communicated with a sand washing tank of the sand washing device, and screened mud enters the screening tank and then enters the sand washing tank.
The principle of sand washing is as follows: under the driving action of a sand washing motor, the sand washing conveying belt moves at a constant speed between the driving rotating roller and the driven rotating roller to drive each sand hopper to move circularly, when the sand hopper enters the bottom of the sand washing pool downwards and bypasses the driven rotating roller, the sand hopper digs a sand source in the sand washing pool in the process, and simultaneously mud in the sand washing pool is stirred. The sand hopper filled with the slurry ascends along the slope of the sand washing conveying belt, in the process, a heavier sand source settles to the bottom of the sand hopper, the upper layer is muddy water with higher mud content, when the muddy water reaches the upper part of the sand washing conveying belt and bypasses the driving rotating roller, the sand hopper turns over, the muddy water on the upper layer is splashed, the sand hopper continues to turn over until the sand hopper is in a back-off state, the sand source deposited at the bottom falls off from the sand hopper, and therefore the sand washing treatment is realized.
When slurry collected by the cutter suction dredger is conveyed through a self-floating pipeline, the slurry is firstly screened by the screening device to remove large impurities, and then is subjected to sand washing by the sand washing device to reduce the mud content.
(6) Carrying out berthing and loading on the sand barge;
in the step, the sand barge can dock and refute the platform after receiving the command issued by the dispatching, the sand barge runs according to the established entrance and exit route, and the anchoring boat assists in docking.
The screening and sand washing platform is provided with a transfer conveyer belt for receiving a sand source after sand washing from the sand washing device, and the transfer conveyer belt is loaded to a sand barge berthed at the side direction of the screening and sand washing platform.
In the process of loading the cabin, the loading position is adjusted according to the loading condition acquired on site, the ship can be moved forwards and backwards in a stranding mode and in a parallel position with the screening sand washing platform, the loading position is adjusted, uniform loading is ensured, and unbalanced loading is avoided.
(7) A sand barge conveys a sand source to a sand unloading position and carries out sand unloading;
in the step, when the sand barge arrives at a sand unloading place for sand unloading, the sand unloading conveyer belt of the sand barge conveys a sand source to another screening device for secondary screening treatment. The screening device can comprise a support and a screen of an inclined facility, a sand unloading conveyer belt is opened after a sand barge arrives at the bank, a sand source in the cabin is conveyed to the screening device, and the finally screened sand source is used as an available sand source of a project site and is used in subsequent projects.
(8) And (5) repeating the steps (4) to (7) to carry out continuous sand production operation.
Claims (9)
1. A construction process for sand mining in a water area with high compactness and high impurity content is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) a step of construction preparation;
(2) a step of positioning a cutter suction dredger;
(3) the step of placing the screening sand washing platform and connecting the self-floating pipeline with the cutter suction dredger;
(4) a step of starting sand extraction of the cutter suction dredger;
(5) screening impurities and washing sand by a screening and washing sand platform;
(6) carrying out berthing and loading on the sand barge;
(7) a sand barge conveys a sand source to a sand unloading position and carries out sand unloading;
(8) and (5) repeating the steps (4) to (7) to carry out continuous sand production operation.
2. The sand mining construction process in the water area with high compactness and high impurity content according to claim 1, which is characterized in that: measuring a construction water area and performing geological survey in the step (1) to determine a specific sand extraction point; self-floating pipelines are arranged at sea.
3. The sand mining construction process in the water area with high compactness and high impurity content according to claim 2, which is characterized in that: and (3) in the step (2), the cutter suction dredger sails to a sand extraction point, the lower anchor is fixed in the construction water area range, and the cutter suction dredger and other ships need to reserve enough safety distance.
4. The sand mining construction process in the water area with high compactness and high impurity content according to claim 3, which is characterized in that: the screening and sand washing platform in the step (3) comprises a ship facility, and a screening device and a sand washing device which are installed on the ship facility; the screening sand washing platform sails to the position near a sand extraction point, is anchored and fixed in the construction water area range, and is reserved with enough safety distance with other ships.
5. The sand mining construction process in the water area with high compactness and high impurity content according to claim 4, which is characterized in that: and (4) directly conveying the slurry obtained by the cutter suction dredger through cutter suction dredging construction to a screening device of a screening sand washing platform through a self-floating pipeline.
6. The sand mining construction process in the water area with high compactness and high impurity content according to claim 5, which is characterized in that: and (5) communicating the screening tank of the screening device of the screening sand washing platform with the sand washing tank of the sand washing device, and enabling the screened mud to enter the screening tank and then enter the sand washing tank.
7. The sand mining construction process in the water area with high compactness and high impurity content according to claim 6, which is characterized in that: and (6) the sand barge can berth and install a barge platform after receiving the command issued by the dispatching, the sand barge runs according to the established entrance and exit route, and the anchoring boat assists in berthing.
8. The sand mining construction process in the water area with high compactness and high impurity content according to claim 7, which is characterized in that: and (6) the screening and sand washing platform is provided with a transfer conveyer belt for receiving the sand source after sand washing from the sand washing device, and the transfer conveyer belt is loaded to a sand barge berthed at the side direction of the screening and sand washing platform.
9. The sand mining construction process in the water area with high compactness and high impurity content according to claim 8, which is characterized in that: and (7) when the sand barge arrives at a sand unloading place for sand unloading, the sand unloading conveyer belt of the sand barge conveys the sand source to another screening device for secondary screening treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010540063.1A CN111648425A (en) | 2020-06-15 | 2020-06-15 | Construction process for sand mining in high-compactness high-impurity-content water area |
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| CN202010540063.1A CN111648425A (en) | 2020-06-15 | 2020-06-15 | Construction process for sand mining in high-compactness high-impurity-content water area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116479965A (en) * | 2023-04-11 | 2023-07-25 | 上海尔速机械设备有限公司 | Construction method and equipment for urban river channel dredging |
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|---|---|---|---|---|
| US4373276A (en) * | 1980-02-15 | 1983-02-15 | Schuttgutfordertechnik Ag | Device for conveying a slurry, such as sand or gravel or the like, lying under water |
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| CN202039401U (en) * | 2011-04-12 | 2011-11-16 | 齐臣有 | Cutter suction dredger |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116479965A (en) * | 2023-04-11 | 2023-07-25 | 上海尔速机械设备有限公司 | Construction method and equipment for urban river channel dredging |
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