ANTITERMITE TREATMENT:
General:
Pre constructional anti-termite
treatment is a process in which soil treatment is applied to a building in
early stages of its construction. The purpose of anti-termite treatment is to
provide the building with a chemical barrier against the sub-terrain termites.
Anti-termite treatment being a specialized job, calls for thorough knowledge of
the chemicals, soils, termite to be dealt with and the environmental conditions,
in order to give effective treatment and lasting protection
to the property
undergoing treatment. It is therefore
mperative that the works
of anti-termite treatment
should be got executed through specialized agencies only.
The specialized agency should be preferably a member of the Indian pest control
Association and shall have sufficient experience of carrying out similar works
of magnitude envisaged in this tender.
The pre constructional soil treatment is required to
be applied during the construction stages of the sub-structure up to plinth
level. The contractor has to be watchful of the various stages of sub-structure
works and arrange to carry out the soil treatment in time after proper
coordination with Department and other contractors if any, working at site.
Scope:
The scope of pre constructional
anti-termite treatment covers the soil treatment with approved chemicals in
water emulsion in foundation trenches for columns, plinth beams, plinth
filling, at junction of walls and floor, in expansion joints etc. in stages as
detailed in this specifications and drawings. Unless otherwise stipulated, the
anti-termite treatment will be carried out as per IS 6313 (part II) 1981 and /
or as per direction of the Engineer-in-charge.
Site
preparation:
In order to ensure uniform distribution
of the chemical emulsion and to assist penetration, the following site
preparation shall be carried out:
a) Remove
all trees, stumps, logs or roots from the building site.
b) Remove
all concrete form work if left anywhere, leveling pegs, timber off- cuts and
other building debris from the area to be treated.
c) If
the soil to be treated is sandy or porous, preliminary moistening will be required
to fill capillary spaces in soil in order to prevent the loss of emulsion
through piping or excessive percolations.
d) In
the event of water logging of foundation, the water shall be pumped out before
application of chemical emulsion and it should be applied only when the soil is
absorbent
e) On
clays and other heavy soils where penetration is likely to be slow and on
sloping sites, where run-off of the treating solution is likely to occur, the
surface of the soil should be scarified to a depth of 75mm at least.
f) All
sub-floor leveling and grading should be completed. All cutting trenches and
excavations should be completed with backfilling in place, borrowed fill must
be free from organic debris and shall be well compacted. If this is not done
supplementary treatments should be made to complete the barrier.
Chemical
to be used:
The
effectiveness of chemical depends upon the choice of the chemical, the dosage
adopted and the thoroughness of application. The chemical solutions or
emulsions are required to be dispersed uniformly in the soil and to the
required strength so as to form an effective chemical barrier which is lethal
and repellent to termites.
Soil
treatment:
One of the following chemicals in water
emulsion, after approval from the Engineer-incharge shall be used uniformly
over the area to be treated.
Mode
and Rate of Application:
The chemical emulsion as stated above
will be applied uniformly by sprayers at the prescribed rates as detailed below
in all the sages of the treatment.
Treatment
in Foundation Trenches:
In case of normal wall load bearing
structures, columns pits, wall trenches and basement, the treatment shall be at
5 litres/sqm. or surface area of the bottom and sides to a height of at least
300mm. After the foundation work, the sides shall be treated at 7.5 litres/sqm.
of vertical surface of substructure on each side. After the earth filling is
done, treatment shall be done by rodding the earth at 150mm centers close to
wall surface and spraying the chemical with the above dose i.e. 7.5 litres/sqm.
In case of framed structure, the treatment shall start at adepth of 500mm below
ground level. From this depth the backfill around the columns, beams and R.C.C.
basement walls shall be treated at 7.5 litres / sqm. of the vertical and at 5
litres / sqm. for the horizontal surface at the bottom in the trenches / pits.
Treatment
on Top Surfaces on Plinth Filling:
The
top surface of the filled earth within plinth walls shall be treated with
chemical
emulsion at the rate of 5 litres/sqm. of the surface
area before sub-base to floor is laid. If filled earth has been well rammed and
the surface does not allow the emulsion to seep through, holes up to 50 to 75mm
deep at 150 mm centers both ways shall be made with crow bars on the surface to
facilitate saturation of the soil with the emulsion.
Treatment
at Junction of Walls and floors:
Special
care shall be taken to establish continuity of the vertical chemical barrier on
the inner wall surfaces from the finished ground level (or from level where the
treatment had stopped) up to the level of the filled earth surface. To achieve
this a small channel 30 X 30 mm. shall be made at all the junctions of wall /
column with floor (before laying sub-grade) and rod holes made in the channel
up to the finished ground level at 150mm apart and the iron rod moved backward
and forward to break the earth and chemical emulsion poured along the channel
at 7.5 litres (or at recommended quantity per sqm. of the vertical wall /
column surfaces so as to soak the soil right up to the bottom. The soil shall
be tamped back into place after this operation.
Treatment
for Expansion Joints:
The soil beneath the expansion joins
shall receive special attention when the treatment under 2.5.1 above is in
progress. This treatment shall be supplemented by treating through the
expansion joint after sub-grade has been laid at the rate of 2 litres per metre
length of expansion joint.
Precautions
during Treatment:
1. Utmost
care shall be taken to see that the chemical barrier is complete and
continuous. Each part of the area shall receive the prescribed dosage of
chemical emulsion.
2. The
treatment should not be carried out when it is raining or when the soil is wet
with rain or sub-soil water.
3. Once
formed, the treated soil barrier shall not be disturbed. If by chance, treated
soil barriers are disturbed, immediate steps shall be taken to restore the
continuity and completeness of the barrier system.
Precautions
for Health Hazards and Safety Measures:
All the chemicals mentioned above are
poisonous and hazardous to health. These chemicals can have an adverse effect
upon health when absorbed through the skin, inhaled as vapours or spray mist or
swallowed. Persons handling or using these chemicals should be warned of these
dangers and advised that absorption through the skin is the most likely source
of accidental poisoning. They should be cautioned to observe carefully all the
safety precautions particularly when handling these chemicals in the form of
concentrates. These chemicals are usually brought to the site in the form of
emulsifable concentrates. The containers should be clearly labeled and should
be stored carefully out of the reach of children and pets animal. They should
be kept securely locked. Particular care should be taken to prevent skin
contact with concentrates. Prolonged exposure to dilute emulsions should also
be avoided. Workers should wear clean clothing and should wash thoroughly with
soap and water especially before eating. In the event of severe contamination,
clothing should be removed at once and the skin washed with soap and water. If
chemicals splash into the eyes they shall be flushed with plenty of water and
immediate medical attention should be sought.
The concentrates
are oil solutions
and present a
fire hazard owing to
the use of
petroleum solvents. Flames should not be allowed
during mixing. Care should be taken in the application of chemicals / soil
toxicants to see that they are not allowed to contaminate wells or springs and
other sources of drinking water.
Guarantee
:
The contractor has to furnish the
guarantee for 10 (ten) years from the date of completion of work, starting that
in case of reappearance of termites within the building area due to defective
materials or workmanship or due to any other reasons, the contractor will arry
out the necessary post constructional treatment to keep the entire area free
from termite, once again, without any extra cost to the Department during the
guarantee period.
Mode
of measurement:
The
payment will be made on the basis of plinth area measurements at ground floor
only for all the stages of treatment in sqm. correct to two places of decimals.
Rate includes the cost of materials, labour and all tools, plants, sprayers
required for complete operation.
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2026 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.