The funnel pump sand carrier as the sand blowing construction platform not only effectively solves the problems of the long distance of the sand mining area, the selection of cinnabar pits, and the environmental protection of the sand blowing operation area but also shorten the blowing distance, reduce the cost, and provide a reference for similar projects.
- Working condition as below
There is a domestic filling area need to refilling area 4,200,000m2 ,all material is sea sand ,with slurry capacity less than 8 %,and all the refilling capacity about 10,000,000m3.
- Construction difficulties
- From the Sand suction place to sand filling place with 48 nautical miles ,if using sand blowing ,that is impossible
- There is a dam from the suction place to sand filling place, sand carrier barge can not arrived
- If using the cutter suction dredger, it will make the Aquaculture with bad effects .
- Water depth is just 2m can not meet the construction condition for big barge .
- Tight working time . the working time is only for 24 months, and the average construction should be 420,000m3/month .
| Item | Construction technology | Advantage | Disadvantage | Application range | Suitable for this project or not |
| 1. Directly Sand Filling | Using cutter suction dredger dredge out the sand and to stockpile by pipeline | Strong applicability to soil in sand extraction area | Discharge distance can not beyond out of the cutter dredger performance .and poor wind resistance | Wharf close to sand extraction area and reclamation area Formation of land behind and reclamation works | not |
| 2. 3 in 1 dredger | Self priming ,self prospell system and self unloading dredger | Not limited by the different from sand suction area to stockpile place | Need to dredge deep place for store the sand barge and also effect the Aquaculture with Potential contamination risk and Environmental protection construction is difficult |
Large and medium-sized reclamation projects with relatively large wind and waves, taking the sand area to the reclamation area | not |
| 3. Funnel Sand Carrier | Based on the proposal 2 and then use funnel sand
Carrier For Sand Blowing to filling area |
Not limited by the distance from sand suction area to sand filling area and small effect for the Aquaculture | Poor wind resistance and complex construction organization | Small and medium-sized sea reclamation projects with relatively small wind and waves and far from the sand extraction area and the reclamation area | Yes |
- Comparing the different construction technology for cutter suction dredger ，trailing suction dredger and sand funnel pump carrier .the third way is suitable for this project .
- The construction process
- Sand Mining Boat With Self Priming Sand Pump Unit in the boat can suction and shipped to the targeted place to unloading the sand by conveyor belt .
- Sand Funnel Pump Boat with 500mm Pump Diameter and 2 Set ,Flow capacity for 2400m3/h
- Working Principle of funnel pump sand carrier
The unloading leaks out under the action of its own weight
The bucket enters the compartment under the ship’s deck, and the ship’s pumping system is filled with water through a high-pressure pump to
The concentration of the compartment is adjusted, and the sand-water mixture is pumped through the sand pump through the slurry outlet.
To the port of the sand outlet on the side of the ship, the blowing filler is transported to the backfill area through the blowing and filling pipeline
- Advantage of Sand Funnel Pump Carrier
- Construction characteristics of funnel pump sand ship
(1) Occupy construction water area is small
The hull of the funnel pump sand ship is small, the draft of the ship is small, and it is a fixed work
platform; the hull is stable during operation, and the water filling pipeline is sinking after exiting the side nozzle.
It will not affect the passage of the water area, and the ships and supporting pipelines occupy a small amount of construction water area.
(2) The sand pump system is relatively independent
The hull is equipped with two compartments, corresponding to two independent water injection and sand pumping devices.
equipment, the two blowing and filling pipelines do not affect each other; equipment or pipeline failures occur during construction
In case of failure, it can be handled independently in time to stop the loss, and the pump will not be caused by the failure of a certain link.
Sand work stopped.
(3) Flexible concentration adjustment
The concentration of sand-water mixture is greatly affected by the weight, gradation and mud content of sand.
Therefore, it is necessary to adjust the concentration in real time in the process of pumping sand construction to avoid pipeline blockage, so as to maintain the stable operation of the equipment and improve the construction efficiency. This type of pump sand ship in the funnel
Adjustable movable hatches are provided below to control the amount of sand unloading in each compartment, and the compartments are filled with water
The water injection volume can be adjusted by the pressure of the high-pressure water pump, and the sand volume and water volume can be controlled.
The concentration can be adjusted flexibly.
(4) Low equipment failure rate
Due to its simple structure, strong operability and low failure rate, the funnel pump sand ship
And the maintenance cost is low. (5) High construction capacity
There are many factors affecting the productivity of sand blasting construction, which are mainly affected by the performance of sand pump and backfilling.
