Concrete Compaction Using Vibration
Industrial vibration is the best method to ensure that air bubbles are thoroughly removed and that the concrete is properly compacted. The technology is applicable to many concrete uses, including precast concrete, construction foundations and large-scale projects like hydropower dams or tunnel linings.
At NetterVibration, we produce high-quality vibration equipment engineered to perform a wide range of industrial tasks, from concrete compaction to the thorough mixing of wet and dry materials. For more information on how our products can contribute to your company’s profitability, call +44 1543 278981.
Vibrating Mass Concrete
A NetterVibration customer in the construction industry in Laos was contracted to build a hydropower dam made of several hundred thousand cubic meters of concrete. The aggregates mixed to this concrete were of a size between 20 and 150 mm. The customer wanted NetterVibration to provide a solution that would compact such concrete in a short time, as they had to pour about 180 m³ of concrete per hour.
They purchased 8 NetterVibration NVI 3 Mass Concrete Compacting Units to be mounted on hydraulic excavators. Each equipment consisting of 3 vibrators was connected to the hydraulic system of the excavator and therefore completely autonomous. The NVI 3 works by inserting the internal vibrators (diameter 150 mm) into the moist concrete, applying vibration, and then moving on to the next spot until the whole concrete block has been compacted. The size of one block is such that 2 or 3 excavators work in one block simultaneously.
After one block is compacted the excavators with the NetterVibration NVI 3 Compacting Unit is moved by crane to the next block.
Vibrating Precast Concrete Slabs
A NetterVibration customer is involved in the manufacture of precast concrete slabs for a variety of uses. In order to compact concrete while it is poured into the mold, NetterVibration supplied him with pneumatic vibrators and brackets adapted to his automatic carousel production.
The customer purchased some NetterVibration NTS 50/08 Pneumatic Linear Vibrators and installed them on the vibrating table according to NetterVibration application engineers’ advice. Once completely cured, the concrete slabs were of high resistance due to the density of the concrete, and impermeable to water intrusion. The vibration also gave the slabs a smooth surface and cut down on the manual flushing time.
Concrete compaction in the care of historical buildings
With a customised vibration table from NetterVibration, Roland Schulze Baudenkmalpflege GmbH, a provider for the preservation of historical monuments, gained a much more effective production process in the field of concrete restoration work on listed buildings.
The traditional family business from Potsdam, Germany, uses the vibration system for the production of high quality, bespoke concrete parts, such as steps and columns in parks or for the restoration of house facades and balconies. The new vibration table from NetterVibration replaces the previously used concrete compaction method with internal vibrators.
The tailored vibration table is driven by two external electric vibrators mounted on the underside of the table. The constant vibration deaerates the concrete and ensures uniform compaction in the moulds on the tabletop. The result: absolutely air-free concrete parts for the further processing and finishing.
With the associated frequency converter, the effective speed of the electric vibrators can be set according to the application and conveniently switched on and off. Another technical detail is the levelling feet, which are height-adjustable to compensate for uneven floors and give the table a firm hold. In addition, this makes it easy to move the unit with a pallet truck.
Vibrating Precast Concrete Sleepers
A NetterVibration customer in the construction industry manufactures concrete railroad sleepers on a semi-automated circular production plant. In order to ensure that the pre-stressed railroad sleepers would conform to the high quality standards of the railroad company, the concrete needed to be vibrated intensely.
The company purchased Netter NEG Series Electric External Vibrators and a special frequency control. The vibrators where installed on the vibrating table that received the molds, applying vibration during filling of the concrete into the mold. The size of the vibrators, the appropriate frequency and the correct location was determined by NetterVibration .
As a result the rail broad sleepers were perfectly compacted at the minimum possible noise level.
Vibrating Concrete Lining for a Tunnel
A customer asked NetterVibration for a study to implement pneumatic high frequency vibrators on the formwork to compact concrete. NetterVibration supplied the technical drawing that showed the spots where the vibrator had to be mounted and thus the mold supplier was able to manufacture the mould accordingly.
This customer purchased a large quantity of Netter NTV 61 Pneumatic External Vibrators that were installed in strategically chosen spots on the mold. These spots were determined by engineers from NetterVibration. The high frequency rotary pneumatic vibrators applied to the mold compact the concrete efficiently to the total satisfaction of the customer and the German railway company.
As a result, once the concrete was cured, the absence of trapped air led to more density and stability.