Concrete Mixers trucks.The next heavy equipment used by Bob the Builder is Dizzy the cement mixers. In the Bob the Builder movie cement mixers are used by Bob the Builder is a simple cement /concrete mixer, Actually Dizzy is an electrical concrete / cement mixing, this is us used to work on the building of mild to moderate, this electrical cement mixer driven by an electric motor. Dizzy certainly not very relevant if we input in the post www.truckmagz.com where in it contains about the various reviews about the truck. But there’s this Dizzy it’s upgraded with truck with cement mixer on her back side.
Dizzy update called with Concrete mixing transport truck or Concrete Mixers trucks, Special concrete transport trucks (in–transit mixers) are made to transport and mix concrete up to the construction site. They can be charged with dry materials and water, with the mixing occurring during transport. With this process, the material has already been mixing. The concrete mixing transport truck maintains the material’s liquid state through agitation, or turning of the drum, until delivery. The interior of the drum on a concrete mixers trucks is fitted with a spiral blade. In one rotational direction, the concrete is pushed deeper into the drum. This is the direction the drum is rotated while the concrete is being transported to the building site. This is known as “charging” the mixer. When the drum rotates in the other direction, the Archimedes’ screw-type arrangement “discharges”, or forces the concrete out of the drum. From there it may go onto chutes to guide the viscous concrete directly to the job site. If the truck cannot get close enough to the site to use the chutes, the concrete may be discharged into a concrete pump, connected to a flexible hose, or onto a conveyor belt which can be extended some distance (typically ten or more meters). A pump provides the means to move the material to precise locations, multi-floor buildings, and other distance prohibitive locations. The drum is traditionally made of steel but on some newer trucks as a weight reduction measure, fiberglass has been used.
“Rear discharge” trucks require both a driver and a “chute man” to guide the truck and chute back and forth to place concrete in the manner suitable to the contractor. Newer “front discharge” trucks have controls inside the cab of the truck to allow the driver to move the chute in all directions. The first front discharge mixer was designed and built by Royal W. Sims of Holiday, Utah.
Concrete mixers trucks are equipped with anywhere from two axles and up. Four, 5 and 6 axle trucks are the most common with the number being determined by the load and local legislation governing allowable loads on the road. These are necessary to distribute the load evenly and allow operation on weight restricted roads and to reduce wear and tear on normal roads. A two or three axle truck during the winter when road weight limits are reduced has no usable payload in many jurisdictions. Other areas may require expensive permits to operate. Additional axles other than those used for steering (“steers”) or drive train (“drives”) may be installed between the steers and drives or behind the drives. Mixers on Concrete mixers trucks commonly will have multiple steering axles as well, which generally result in very large turning radii. To facilitate maneuvering the additional axles may be “lift axles” which allows them to be raised off the ground so that they do not scrub (get dragged sideways across the ground) on tight turns, or increase the vehicle’s turning radius. Axles installed behind the drives are known as “tag axles” or “booster axles”, and are often equipped to turn opposite to the steering axle to reduce scrubbing and automatically lift when the truck is put into a reverse gear.
Tractor trailer combination mixers where the mixer is installed on a trailer instead of a truck chassis are used in some jurisdictions, such as the province of Quebec where even 6 axle trucks would have trouble carrying a useful load.
Concrete mixers trucks generally do not travel far from their plant, as the concrete begins to setup as soon as it is in the truck. Many contractors require that the concrete be in place within 90 minutes after loading. If the truck breaks down or for some other reason the concrete hardens in the truck, workers may need to enter the barrel with jackhammers; dynamite is still occasionally used to break up hardened concrete in the barrel under certain circumstances.
Stephen Stepanian filed a patent application for the first truck mixer in 1916.Trucks weigh 20,000 pounds (9,100 kg) to 30,000 pounds (14,000 kg), and can carry roughly 40,000 pounds (18,000 kg) of concrete although many varying sizes of Mixer Truck are currently in use. The most common truck capacity is 8 cubic yards (6 m3).
Most Concrete mixers trucks in the UK are limited to a speed of 56 miles per hour (90 km/h).
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