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Standard Methods To determine Plant Requirements

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Introduction

Alexander Ofori 25th December, 2007. Task 2 D2 Evaluate the standard methods used to determine the plant requirements the construction of building 3 and 4. The evaluation will need will need to include at least the following: * Range of construction plant considered * Characteristics and use of suitable plant * Cost versus hire options * The time and labour savings * Implications for programming methods Range of construction plant considered * Bulldozers * Scraper * Concrete Mixers * Tractor shovel * Excavator * Crane * Concrete Pumps Characteristics and use of suitable plant Bulldozers Used in earth moving and levelling: equipment used in heavy construction, especially civil engineering projects, which often require the moving of millions of cubic meters of earth. The primary earth-moving machine is the heavy-duty TRACTOR, which, when fitted with endless tracks to grip the ground and with a large, movable blade attached in front, is called a bulldozer. Bulldozers are used to clear brush or debris, remove boulders, and level ground. * A scraper is a machine that may be pulled by a tractor or may be self-powered. It consists of a blade and a box or container. Dirt is scraped by the blade into the container; the dirt may then be released so as to form an even layer of a predetermined thickness, or be carried off for disposal elsewhere. Scrapers are used to level and contour land, as in road construction. * Somewhat similar to scrapers are graders, self-propelled, wheeled machines with a long, inclined, vertically adjustable steel blade. Graders are primarily finishing equipment; they level earth already moved into position by bulldozers and scrapers. ...read more.

Middle

Excavators Excavating machines are one of the most fascinating pieces of modern equipment. They have had a fundamental impact on the way excavation work is carried out. They can have extremely high outputs capable of excavated in excess of 100 cubic metres per hour on bulk excavations. They are often able to excavate most types of soil, and can even remove rock using an hydraulic breaker fixed to the end of the excavator arm. There are a wide variety of designs and sizes but they can be loosely placed within one of tescalating machines are one of the most fascinating pieces of modern equipment. They have had a he following three broad categories. Universal excavators: this is the common tracked excavator with a common power unit. The machine can slew or swing through 360 degrees. They are known as 360 machines. They are equipped with a hydraulic we operated ball to which are fitted a variety of sized buckets. They are very popular on virtually all sides and have an extremely good capacity for hard work. Multi- purpose excavators: the best example of this type is the ubiquitous JCB's, a wonderfully adaptable machine with both front and rear lifting functions. They are a 'jack of all trades', being able to move bulk material using the front bucket, as well as in able to carry out small excavation operations using the back actor. Though they are of a lower output they are quick and efficient. These excavators are normally equipped with large rear wheels and smaller front wheels, all being driven under a four wheel drive arrangement. ...read more.

Conclusion

An old adage is 'a pint of oil is the cheapest form of maintenance ever devised'. It is the responsibility of all plant departments to ensure that when a fitter is sent to a particular site, his journey should be routed via other sites, where he can check over the condition of pieces of plant to ensure that maintenance and adjustments are being carried out. It must, however, be realised that the breakdown is top priority and men should be routed so that the breakdown is covered first and the preventative maintenance covered afterwards. It must be remembered that every machine requires maintenance and this should be pre-planned. Prevention is better than cure. To bring about an efficient maintenance scheme, labour is required in the form of service engineers, vans and these, together with the material involved, must be allowed for when assessing the cost of a plant department in relation to the use of general and, especially, specialised equipment. The time and labour savings The type of plant and number required will be effected by 1. The sequence of the work dictated by the design of the building. 2. The methods of construction used by the contractor. 3. The working space available. 4. The quantity of work involved. 5. The time available to do the work. This may involve the balancing of plant, for example and excavator can excavate 24 m3 per hour, which requires removal off site. The Lorries used are 8m3 capacity therefore 24/8 = 3 Lorries will be required. This is called plant balancing. This balance will affect the numbers required as well as the duration of the work. If the plants are not balanced efficiency on site will not be achieved. Implications for programming methods ...read more.

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