Types and construction process of compound wall

The purpose of a compound wall is to contribute elegant look, privacy and security to any building. It checks movements of unessential objects in the building. It is erected to detach any building from other building and arrange proper segmentation to your property.

Types Of Compound Walls: Based on the appearance & construction material applied, various types of compound walls are found in building.

In this construction article detail information is given on masonry compound wall and precast compound wall.

Masonry Compound Wall: Red clay bricks / Fly ash bricks, steel and cement mortar are considered as the major components for masonry compound walls construction. The compound wall is built up from 2 ft. below ground level to provide perfect anchorage to the wall.

Toward Individual House Construction, the height of the masonry compound wall is normally kept among 5-6 feet and the thickness is normally150mm.

Once excavation work is completed, a PCC of 100 mm thick and 600 mm wide is provided to develop an even surface on which the compound wall can be placed.

A rubble masonry having 450 mm width and up to 2 feet height is arranged underneath the brick wall to disperse the load of the structure constructed above.

Over rubble masonry, a RCC Coping of 4″ thick is formed for making the surface smooth as well as transmitting the loads of the compound wall to the substructure underneath.

Over RCC coping, masonry compound wall is built up with 6”Red clay bricks or 4” Red clay bricks / fly ash bricks. Intermittent brick columns with dimension 300mm X 230mm are erected at a distance of 7 ft to 10 ft center to center and at the corners of the plot.

Once the curing of this masonry wall is completed, cement plaster is employed on both the sides of compound wall and paint is used.

The cost of a standard masonry compound wall that is normally applied in residential buildings averages to Rs. 1200/Rft along with a 8 Feet wide MS Gate on the front size. The cost may fluctuate +/-10 % based on the accessibility of local materials like bricks, rubble etc.

Bonus Tip: To enhance the elegant look of the wall, the grooves can be included with the plaster.

Precast Compound Wall: Currently, precast compound wall is mostly found in different areas since they can be set up simply and finished within very short span. But the strength and stability of the compound are not up to the standard.

To create perfect precast compound walls, the consideration should be given on developing proper foundation to the structure and the walls.

As the precast compound walls are factory made and are transmitted to site, the overall cost is considerably less with regard to masonry compound wall. Based on the design and necessary customization, the cost fluctuates significantly.

The cost of a precast compound wall normally commences from Rs. 60 per sqft (i.e., roughly Rs 400 per Rft). This cost is exclusive of the cost of foundation, painting, gate, any other finishing etc. Therefore, while measuring the cost of precast compound wall, all these should be contained in overall costing.



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Published By
Rajib Dey
www.constructioncost.co
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Reasons for collapsing of foundation

There are several reasons for collapsing of foundation which range from poor soil condition, structural faults etc. Given below, some of the major causes for collapsing of foundation :-

1. Collapsing of Foundation because of surpassing the bearing strength of soil
2. Collapsing of Foundation because of withdrawn of moisture from Soil all of a sudden
3. Collapsing of Foundation because of differential or unequal settlement
4. Collapsing of Foundation because of uneven progress and pattern of construction
5. Collapsing of Foundation because of movement of adjacent soil.

Collapsing of Foundation because of surpassing the bearing strength of soil:-

Ultimate bearing strength means ultimate load intensity that a soil can bear devoid of any shear failure of the Soil. The size of the footing with regard to length, breadth and diameter, is primarily based on the bearing strength.

A foundation/ footing of a structure must contain adequate size in order that the intensity of load directing via that footing from the structure to the soil below should not raise the bearing strength of that soil. If the bearing strength of soil is low or load operating is heavy and the size of the footing is relatively small than actual requirement then the load intensity (i.e. load per unit area say KN/sq.m. etc.) conveyed on the soil may be greater as compared to the bearing strength of the soil, for this reason a shear failure of soil will occur.

To provide perfect footing size, the safe bearing strength rather than ultimate bearing strength should be applied to obtain margin of safety against any accidental loading as well as abnormal behavior of the soil due divergence in its bearing strength. Safe bearing strength is nothing but ultimate bearing strength divided by a appropriate factor of safety usually varying from 2 to 4.

Collapsing of Foundation because of withdrawn of moisture from Soil all of a sudden :

It is one of the most crucial factors that should not be neglected. Moisture withdrawn occurs in the following ways :-

a) By draining water from the adjacent well through pump
b) By dewatering adjacent Pond
c) Reduction of ground water table close to the ground previously.

Since the soil usually comprises of soil solid, water and air and super structural load on soil is carried by the both soil solid and pore water, as soon as the pore water is withdrawn, it will produce voids inside the soil system around and at the bottom of the foundation soil that leads to subsidence of the soil together with supporting structure. As a result, the collapsing of foundation happens.

To get more details about other reasons for failure, go through the following link www.mycivil.engineer



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Published By
Rajib Dey
www.constructioncost.co
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