Pneumatic Tyred Rollers for quality compaction

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pneumatic tyre roller
Pneumatic tyre roller

Compaction is a major element of NHAI roads to avoid timely road damages, potholes, road breakage as a result of poor construction of the roads. Pneumatic Roller is therefore highly necessary in the construction of roads to achieve maximum density and excellent smoothness of road that can endure for ages. Its main purpose is to ‘maneuver’ the material to effectively remove air voids resulting from the loosely placed material until achieving a nominated level of compaction. It can be used on both soil and asphalt. They are also widely used for the compaction of subgrades, bases and bituminous mixes. These types of compaction equipment are suitable for soft base materials or layers of loose soil and closely grained sands. Manufacturers are focusing on maximum compaction technologies for solid paving applications. The models are machines equipped with ergonomic controls and a rotating, sideway-sliding seat and steering assembly so as to make it easier and more comfortable to operate. The new machines are built along modular lines and share components and subsystems. Discussed below are different technological modifications that are being adopted by pneumatic tyred roller manufacturers in India for quality compaction.

Pneumatic Tyred Rollers for quality compaction

Pneumatic tyred rollers with Optional Traction Control

Pneumatic rollers now come with optional traction control that boosts productivity on tough terrain. The proven hydrodynamic propulsion system ensures productivity. The rollers provide the kneading and sealing effect for job sites increasing productivity on tough terrain. The tyred rollers perform on both aggregates and asphalt, offering flexibility with air pressure adjustment features. Ballast packages easily can be added or removed to ensure the most efficient machine and process are provided. can be used on several different projects such as subdivision streets, large parking lots, and driveways. Operators would find the machine easy to control as it is very user-friendly and easy to operate, it comes with a spacious cab. Everything can be easily managed by the operator through a control operation station. Pneumatic rollers have become more popular with stiffer mixes since they can help you achieve compaction density. These types of rollers consist of tyres that provide better static penetration into the materials. The weight of the machines and the air pressure of the tires can be adjusted to meet the specific pressure desired on a particular job.

Amann AP 240 

Pneumatic tyred rollers with Roll-Over Protective Structure feature

Pneumatic rollers now come with safety features such as  Roll-Over Protective Structure. The system is intended to protect equipment operators from injuries caused by vehicle overturn or rollovers.  It involves bars attached to the frame that maintain a space for the operator’s body in the event of a rollover.  The operator is protected by an integrated sunshade, and can opt for either of the dual seats and use the sliding console, allowing both good comfort and sightline visibility when working. The newer model compacts using the forces of mass and manipulation; it can be adapted to a variety of applications by adding or removing ballast or by adjusting tire inflation pressure. The positioning of the tires, four each on front and rear, helps to ensure uniform surface coverage while rolling. The tires’ kneading action against the material surface provides excellent compaction. An isostatic suspension for the front tires helps to keep the roller stable on irregular surfaces as well as maintaining uniform tire contact pressure. The models also include dual seats with a sliding console to give the operator the most convenient work position and the best view of the work area.

Volvo CE PT220C

Pneumatic tyred rollers with a modular ballast system

Modern pneumatic tyred roller features a modular ballast system and flexible operating weight of 10, 000 kg to 27, 000 kg. The machine models offer excellent visibility, ECO-mode operation, even compaction, and excel on a variety of materials due to its flexible air-on-the-run capability. These are ideal for applications like wear courses and binder courses as well as compaction of natural soils and materials with cement. Ballast options include modular and non-modular steel, sand, and water. The 6.5 metric ton modular steel can be easily added or removed through bolt-on side panels. The internal, non-modular steel consists of 6.1 metric tons. The machine also features dual infra-red sensors mounted on the front and rear of the machine to deliver real-time readings that keep the operator informed of when to begin rolling and when to stop. This system helps operators avoid tender zones that often occur in the 104º-110º C temperature range. Pass-count mapping is also attached for operators to achieve target density and increase roller efficiency. The system records and monitors pass patterns to display coverage. The system also helps operators optimize drum overlap, simplify nighttime operation, eliminate second-guessing and prevent incomplete passes such as stopping short. The sliding and pivoting operator station rotates 90° to either side for ultimate comfort and control. The new console design includes an LCD and push-button machine controls that simplify operation for an all-around comfortable operating environment.

CAT CW16-11

Pneumatic tyred rollers with the hydraulic transmission system

The newer pneumatic rollers model is built on a hydraulic transmission system, which simplifies steering and on-off operations. A single pump, single motor transmission system with steady speed adjustment poses no impact on road material. The new roller is available with a compaction width 2350 mm to 2370 mm and a maximum operation mass of up to 30 000 kgs to 125 000 kgs. In addition, the hydraulic propulsion system increases reliability and reduces maintenance costs. A significant feature of the machines is the smooth start-stop procedure when changing driving direction. The wide base tyres, air-on-the-run option and backup sprinkler further enhance the resulting quality. The braking system has two separate circuits which can maintain full braking capacity even if a damaged hose or other failures should disable one of the circuits. With the optional temperature sensor and the unique analyzer, the machine can achieve optimum density and surface texture while providing full statistics and documentation.

Dynapac CP275

Pneumatic tyred rollers with an electronic machine management system

Electronic machine management systems in modern pneumatic rollers aids to monitor and control all key machine functions. The system automatically adjusts the diesel engine speed to meet the power requirements of the individual drives. It also controls the hydrostatic vibration drive and the various steering programmes, guaranteeing smooth movement of both drums. Depending on the model and equipment, additional functions may be controlled. For earthworks or asphalt work an electronic machine management system comes in and it supports the operator in their day-to-day construction work to achieve optimum compaction without compromising on safety, cost-efficiency and fuel savings. Other advantages include high traction and gradeability thanks to anti-slip control, prevents the drive from vibrating when the machine is at a standstill, prevents engine overload, ensuring high operational reliability, prevents operating errors via driver support, reduces operating costs thanks to longer component service lives and lower service costs etc.

HAMM HP 280i

Pneumatic rollers with closed hydraulic drive system

Newer models come with a closed hydraulic drive system which is composed of an electro-hydraulic proportional variable displacement pump and motor, ensuring better drive performance and higher gradeability. Two gears infinitely variable speeds to ensure optimized working speeds under different working conditions. Electronic levers with operation comfort can realize the soft start, soft parking performance of the machine. The machine uses the box type integral frame, each part of the body is designed with an access hole and overturned cover board to facilitate maintenance and curing of each component. The machine models with closed hydraulic drive systems are applicable for compacting operation of asphalt pavement, foundation layer, secondary foundation layer, dam and industrial construction site. The machine’s dual-circuit brake technology has a higher brake effect, fast response speed, short brake distance and higher reliability applicable for working in mountainous areas.

L&T 2490 Pneumatic Tyred Roller

Conclusion

Discussed above are different types of features being upgraded to suit the requirements of compaction in the Indian terrain. The technological advancements will help to achieve maximum density and excellent smoothness of roads that can endure for a long time. The pneumatic tyred roller manufacturers are focused on increased productivity, enhanced quality, reduced emissions or fuel savings.

Image Source: ammann.com/cn-en, volvoce.com/india/en-in/, cat.com/en_IN/, dynapac.com/en/, wirtgen-group.com, larsentoubro.com