Qingdao Huahai Environmental Protection Industry Co., Ltd. is one of the China’s major rubber dam manufacturers, established in 1975, has 93000 square meter production premises, 520 employees including 90 senior engineers, and RMB 200 million assets.
Huahai has introduced the advanced production equipment for rubber dams, and it has set up a laboratory with advanced testing equipments and put the quality assurance system in operation.
Huahai has produced 4000 rubber dams not only in China, but also in Vietnam, the United States, Indonesia, Bangladesh and Iran.
Rubber dam is made of high-strength synthetic fabrics and compound rubber, anchored in the concrete foundation to form a sealed air bladder inflated with water or air in dry seasons to store water. In rainy seasons, water or air inside of rubber bladder would be discharged to help release floodwater from river course. Compared with common civil works, the advantages of rubber dam are less engineering budget, shorter construction period, extended service life, simplified maintenance and improved vibration resistance. Rubber dam can be adjusted at any height and overflowed so it is widely used for irrigation, power generation, flood control and urban landscaping in many areas.
As the major products of our company, air inflatable rubber dams are produced with advanced technology and professional experience.
Rubber dam includes rubber bladder and automatic control system:
The rubber bladder is made of strength canvas and rubber layers. The canvas serves as the force-bearing frame of the dam with good flexural stress resistance and excellent adhesion function. The rubber layers consist of out-layer, middle-layer and inner-layer to protect the canvas.
Physical and mechanical properties of the rubber material for making rubber bladder
Item
Unit
Outer layer
Middle layer,Inner layer
Cover rubber sheet
Test standard
Tensile strength at break≥
Mpa
14
12
6
GB/T528-2009
Elongation at break≥
%
400
400
250
GB/T528-2009
Permanent deformation at break≤
%
30
30
35
GB/T528-2009
Hardness(shore A)
.
55~65
50~60
55~65
GB/T531.1-2008
Brittleness temperature≤
°C
-30
-30
-30
GB/T1682-1994
Hot air aging
(100°C*96h)
Tensile strength at break≥
Mpa
12
10
5
GB/T3512-2001
Elongation at break≥
%
300
300
200
GB/T3512-2001
Hot water aging
(70°C*96h)
Tensile strength at break≥
Mpa
12
10
5
GB/T1690-2010
Elongation at break≥
%
300
300
200
GB/T1690-2010
Volume expansion ratio≤
%
15
15
15
GB/T1690-2010
Ozone aging: 10000pphm, temperature 40°C, stretching 20%, no cracking
min
120
120
100
GB/T7762-2003
Wear loss( Akron) ≤
cm³/1.61km
1.0
1.0
1.2
GB/T1689-1998
Flexibility, no cracking
Ten thousand times
20
20
20
GB/T3934-2006
The automatic control system consists of computer software technology, PLC control technology, communication and transmission technology and sensor test technology etc. The system can automatically adjust the inflation and deflation of the tubes according to the water level, which can be used in daily operation and flood emergency control for the safety of the dam. Parameters can be set and adjusted remotely through monitoring software for video surveillance and daily management. The system can also be controlled through mobile phone SMS. One control system can manage several tube dams in a river .
Up to now,Huahai has offered more than 4000 rubber dams throughout China and in Vietnam, Bangladesh,Iran and many countries oversea. Our company attaches significance to customer satisfaction and credit business philosophy and offers quality products and reliable after-sales services to customers.We could provide the rubber dam bags, anchorage elements, pump house and drainage system according to the requirements of customers. We also can adopt effective solution to guarantee the project quality ,according to different local base foundation and geographical condition, climate feature, humiture of the project.
Customers can choose different types for different needs, and we can supply customers with technical materials and special support .
Our Services
"Satisfaction from customers is our persevering pursuit" is the tenet we have always been following. We warmly welcome friends from all circles to contact us for potential cooperation.
