How to block a river hundreds of meters wide to prevent high tides and saline intrusion easily and quickly to ensure crops for farmers?

Statistical figures on damage caused by saltwater intrusion in the provinces of the Mekong Delta in 2019-2020 (according to statistics at the Department of Natural Disaster Prevention and Control in 2019-2020)

Ca Mau province: Production loss: Damaged rice and shrimp area is 16,554.8 ha, Damaged winter-spring rice area: 10,644 ha, Damaged vegetable and vegetable area > 70%: 3.6 ha

Ben Tre Province: Loss of 104.7 ha of Autumn-Winter rice (30 - 70%); 5,000ha of winter-spring rice grows and develops slowly. All people in the province are affected by saline water.

Tra Vinh province: Damaged 624ha of winter-spring rice (30-70%: 461ha, >70%: 163ha); The total number of households suffering from lack of domestic water is 8,662 households (Cang Long and Chau Thanh districts).

Vinh Long province: Total number of households affected by saline intrusion in domestic water sources is: 66,200 households (Vung Liem, Tra On, Mang Thit and Tam Binh districts).

Kien Giang province: Totally damaged 172ha of seasonal rice (An Minh district), 1,503ha of winter-spring rice (30-70%).

Soc Trang province: Damaged 1,000 ha of winter-spring rice (30 - 70%: 773 ha, >70%: 227 ha).

The construction of temporary dams and larsen pilings to prevent salinity is only suitable for small rivers and then has to be removed when the drought season passes and cannot be applied to large rivers, which is costly and costly. Lots of local workers.

In recent years, saltwater prevention sluices have been built closed, applying modern technology, simple operation, bringing great benefits, and efficiency.

Cai Lon Sluice

So how to block a river to prevent saline intrusion and high tide?

Working principle:

The valve gate will be linked with 02 large hydraulic cylinders installed on both sides; The hydraulic cylinder mounted on a fixed base is the most important main device for raising and lowering the valve gate and is hydraulic power from the hydraulic power station system through stainless steel oil pipelines and flexible hoses. A control cabinet will be connected to equipment such as hydraulic pump, hydraulic valve, pressure sensor ... on the power station and the sensor on the cylinder. The operator only needs to press the control button to raise the door, lower the door, etc. on the control cabinet and the valve door will automatically close and open according to the required purpose.

The detailed structure of the system includes

Mechanical system:

The valve gate made of metal is the main device to stop the flow of water. The valve gate will be fitted with P-shaped rubber to seal the water at the positions of the boundary beams and bottom beams surrounding the door.

- Intake gate/ vertical gate

- Crest gate/ Flap gate hinged bottom

- Radial gate

- Shiplock gate

• Hydraulic system:

  Hydraulic cylinder: Due to the specificity of the project, which is to raise and lower the valve gate with a large size to prevent water, and at the same time ensure water traffic, so hydraulic cylinders will be required to manufacture large sizes with travel lengths and different mounting styles; Common mounting styles such as MT4 Trunion; mounting type MP5 double-head ball bearing…

  To ensure a long service life of hydraulic cylinders, it is very important to determine the characteristics of the working environment to choose the right piston rod surface coating. With the crest gate/flap hinged bottom gate in the western provinces, the piston rod is often immersed in the saltwater environment near the sea, brackish water changes constantly, currently the piston rod surface coating is being applied such as HVOF, Laser Cladding; Endurop 2000-2200, PTA…These are the most advanced piston rod protective coatings from the world's leading cylinder suppliers, applied and proven, providing a much longer life than conventional coatings the hard chrome plated piston rod we commonly find in excavators, construction machinery and general industrial applications.

  Because the piston rod is often exposed to water, mud, and dirt, the choice of seal is also extremely important to protect the hydraulic cylinder. Normally, these hydraulic cylinders will be used with multi-layer V seals, which are resistant to dirty water and mud entering the hydraulic system.

  Hydraulic power station, oil pipeline: Oil tank is calculated and designed according to Standard: Din 19704/123; Vietnam Standard 8300-2009; Hydraulic oil tank material is usually made of stainless steel;

  The volume of the oil tank will be calculated according to the standard to hold enough operating oil during the full opening and closing of the hydraulic cylinder

  Hydraulic element equipment such as pump, hydraulic valve, oil filter... calculated in terms of capacity, flow, valve size and imported from EU/G7 countries, then integrated and assembled at our factory. An Hung company

  Electrical control system: Control cabinet, Scada system

Benefits brought

Thanks to the application of hydraulic system to raise and lower the valve gate to the works to prevent saltwater, anti-flooding, the metal valve doors with a width of up to 40m, weighing up to 200 tons are actively controlled to raise and lower. , easy, fast and secure. When predicting saltwater intrusion or high tide, the system can automatically control, or the operator will press the button to close the door in time through the SCADA system and monitoring sensors, or the control cabinet. control in place.

Tra Vinh province has reduced the damage of thousands of hectares of crops and the cost of dam construction thanks to the timely operation of Tan Dinh and Bong Bot sluices, which were put into operation in 2019-2020.

Kien Giang province has reduced damage thanks to Cai Be sluice gate, which was temporarily put into operation in February 2021

Reputable supplier

An Hung JSC provides synchronous equipment including valve doors, hydraulic cylinders and power station systems, electrical control cabinets. Typical projects we have implemented are Cai Lon and Cai Be Irrigation sluice projects, Kien Giang province; Tan Dinh sluice, Bong Bot sluice, Tra Vinh province; Trung Nhuan sluice in Ben Tre province; Cong Xuan Hoa in Tien Giang province; Cong Nam Can, Ca Mau province; Binh Nham sluice in Binh Duong province; Buddhist temple culvert in Bac Lieu province..

With a factory system invested in modern equipment, a team of skilled technicians and leading prestigious suppliers in the world, we are committed to bringing partners and customers high quality products, ensuring the schedule with the most optimal cost. During the process before, during and after signing the contract, we provide 24/7 package services on: Consulting, design; Manufacture; Supply and installation; Operating instructions for technology transfer; Warranty and after-warranty repair and maintenance so that customers can rest assured, trust and choose us to cooperate.

An Hung Mechanical and Equipment Joint Stock Company

  Your trust, our future.