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Rubber dams are hydrostatic structures provided with a bladder of textile-reinforced rubber. It is screwed to the dam structure which creates a tight inner space. The dam may be water-filled or air-filled.
Purpose of a rubber dam
It creates a balance between the internal pressure of the dam and the water load on the bladder.
How does it work?
It works in the following order
The pumps and valves are controlled from a power house.
The appliances required for water-filled systems are located in underground shafts and for air-filled systems in an over ground power house.
By varying the filling volume and adjusting the height of the bladder, the retention and discharge sections are adjusted as per requirements.
Using the respective control system, the retention set point is set and adhered to reliably.
The duration of Inflating and/or deflating is also adjusted as per requirements.
The filling medium is supplied to the rubber dam by pipes connected with the control system.
As soon as the rising water level in the retention zone exceeds the retention set point, the bladder is gradually deflated until complete depletion, thus clearing the full dam opening.
As the water level decreases the bladder is inflated.
In this way the upstream water level is kept constant at the specified retention set point.
The choice of the appropriate filling medium depends on the requirements of the individual project. A number of criteria have to be considered at the planning stage.
What is air filled rubber dam?
The bladder of this type of rubber dam is filled with air. The dam is kept erect only by the air pressure inside the bladder.
How does it work?
For inflating the dam, the compressor located in the power house on the riverside feeds air into the bladder through a control pipe. The inflating bladder is completely air-tight, including the side wall sections, impounding the upstream water as the filling proceeds.
The deflation process is carried out by electrically or pneumatically controlled valves. Additionally, all valves can be operated manually. In the case of small dams, the entire control system may be housed in a thermally insulated and heated control cabinet.
Unique product features
The rubber dam is equipped with a number of sensors ensuring safe operation, precise setting and permanent monitoring of the dam operation. The sensors measure the water level in the retention area and the internal pressure of the bladder.
The interior of the bladder is monitored for possible condensate formation or intrusion of outside water.
Separate measuring pipes are provided leading to the control house to maintain the internal pressure of the bladder for each span.
The control system developed by Floecksmühle ensures strict observance of the retention set point.
These are not overtopped as evenly as water-filled dams. Up to a deflation of approx. 95% to 90% of the maximum bladder height, air-filled dams behave in a way similar to water-filled dams. When depleted further, a V-shaped dent forms involving higher overtopping of the dam.
Hebei Heng Yang Equipment Manufacturing Co., Ltd
