SUBJECT: BASIC TECHNOLOGY
TERM: 3RD TERM
TOPIC: BUILDING CONSTRUCTION: SITE PREPARATION I
Site preparation involves the removal of trees, demolishing buildings, removing any and all old underground infrastructures, and any other things that might affect the construction process in the future or hinder the project to be done.
In various building projects, site preparation is very essential. The site may be a thick bush with big trees or a swampy and waterlogged area or a site with small hills and valley covered with stones and rock, or even a site with old and abandoned buildings.
TYPICAL HAND TOOLS IN SITE PREPARATION
Among the typical hand tools in site preparation operations are:
MECHANICAL TOOLS USED IN SITE PREPARATION
Mechanical tools, which are also very valuable in speedy operations of site clearing, tackle the bulk of the heavy jobs on the site. Among these are following:
REMOVAL OF VEGETABLE SOIL SMALL TREES AND SHRUBS
The bulldozer is moved in to push down unwanted structures like old buildings and to uproot trees and shrubs. This debris is moved away to the site where parts of the trees are later salvaged for firewood. The bulldozer then scraps or excavates the topsoil to a depth of between 150mm and 300mm for the entire surface area of the site.
To prevent weed growth, an herbicide is applied. Herbicide is chemicals that are capable of preventing the growth of weeds when applied on a building site.
Techniques for Grubbing out roots and stumps
It is better to first fell the trees, cut the trunk and transport to the sawmill for conversion into timber. The stump left is then tackled. Some digging is done around the tree stump to expose the roots, which are then cut either with an axe or the chain saw and the stump finally pulled out by the bulldozer.
LEVELING THE SITE
When all the tree stumps and roots have seen grubbed out and the top vegetable soil excavation to a depth of between 150mm and 300mm, a grader is moved in, to level the site. Here, earth is cut from the higher ground and moved down to fill valleys, holes and gullies.
EXTERMINATION OF TERMITES AND THEIR NESTS
When termite’s nests and anthills are found on the construction site they should be destroyed. The anthill is knocked down and some poisonous chemicals like Gamaline or antitermite chemicals are mixed and poured into the nest to kill the termites.
Read about Setting out (NERDC Basic Tech. for JSS2 page123-126)
© Lesson Notes All Rights Reserved 2023