:
21. Wh a t
r!
the considem tion s before demolition ? $ov I rrac Consiilerations should be given to
)-
> )
a
:-"I$-l
I
Ccrrrducting a silc and
buildilg sr.[vey. rvith
a structural bias;
The examination ofdrawings and details ofexisling constructicin where available; The preparation of details and drawings from site survey activities where no such
information is availabl..;
>
Establishing previous lrse of premises, especially with regard to flammable substances or substances hazardous to health or safety;
> Programming tlre sequence ofdemolition work; ) The preparation ofa Method Statemenr :PART
-B lq Marks
l..Bricrly explain about yacuum concrcte.
.
[furtxi
2-oD-
'
el'du}.A)
High water cement ratio is halmful tothe overall qtiality ofconcrctc, where as low water-cement ratio does not give enough workability for concrcte to be compacted hundred percent.
.
Generally higher workability and higher stringth or very higher srrength do no! go hand in
.
low workabiliry
and
hand. !
Now. vacuum prccess of concreting enables to meet this conflicting demand and this process helps a high workable concrete ro get high strength.
VacuuEr Concr€le: Only lbour hall of the water added in concrete goes into chemical conrbination and thc renlaining waler is used to ntake concrete workable.
Afier laying concrele. lvater wllich was making concreting workable is extracted by
a
special melhod knorvn as "vacuunt nrethod". This water left in this concrete is only thaf which is to go in chenrical conthrnalion and her)ce resulting concrele become very strong.
Mrpufilclurinp I'rocessi 6cncral arr'lngclltcnt lor racuurlr concrilc Process.
thc cquipnrcnr cssenltallY consists of'
;
\,acuunl pulltl)
I
> > . .
wster scparator and
filtering mat
The filtering consists ofa backing piece with a rubbcr seal all round lhe periph€ry
A
shcel of cxpanded melal and thcn a sheet
ol wire
gauge also forms a pan
of
filtcdng mat.
.
The mat of the suction mat is connected to the vacuum pump. When lhe vacuum pump op€rates, suction is cr€atcd within the boundary of the suction mat and lhe cxcess water is sucked from thc concrete throuSh the tine wire gauge.
.
At
lcast onc face
of thc
concrcla must bc opcn
to thc
atmosphcrc
lo
crcate
differcnce of pressure. The contraqtion ofconcrctc caused by the loss ofwater must bc
.
vihrated.
I
Thc vacuum processing can be carricd out either from the top surface or fiom the side surface. There
will
be only nominal difference in the efliciency of the top
processing or side processing.
:r
2. Explain in rtetail about Guhite. Sovlaazaz -
8la'*4
Gunite can be defined as mortar conveycd.through a hose and pneumatically projected at a high vclocity on to a surface.
.
Thc dcvelopment of this method is by thc intmduction of cou6e aggregation and thc rcduction ofcement makes the process economical.
Guniting was first introduc€d
in
1900 and this process
is mostly used lor
pneumatically application old monsr ofless thick)ess.
Shotcrcte is
a
recent development on the similar principle
of guniling for
achieving g'eater thickncss with small coarse aggregate.
'fhere are two process in usc. namely;Wet mix process in use, namely
Dry mix process and the dry mix process is more success,ill.
Dry mix
.
Drocessr
I
The dry mix process consisls ofa number ofsiagcs and calls li)r sonlc specrticd plant.
.
(;eneral arrangcmenl ol'apparatus in gunite systcnt.
i
I . . . .
.
The stages iDvolvcd in the dry mix process Cement and sand are thoroughly mixed. The cement/ sand mixture is fbd into a, spccial air pressur.ized mechanical feeder termed as Cun.
The mixture is rnetered inro the delivery hose within the gun.
bj
a feed wheel or distributor
The material is carried by compressed air thrdughi the delivery hosc to a spccial nozzle. The nozzle is fitted inside with a perforated manifold through which water is sprayed under pressure and intimately nrixed with the sand /cementjet. The web motor is jetted from the nozzle at high velocity onto the surface ofthe
gunited.'
Tlre stagd ilvolved in the wet mir piocess
.
In this process.
tl.te conc.ete
is mixed with water as for ordina_ry concrete before conveying rhrough rhe delivery pipeline ro the nozzle, at which poinr it is jetted by
.
compressed air, onto thc \.ork in the same way as that if mix process.
The wet process has been generally desired in favour ofthe dry mix process, owing to tlte grcirter success oflhe la er.
3, Explain
control.
.
'
llust [linina(ors llust convcrtcr coating system for corrosion
[F,l Iu^1
,o,o
]
t C-U."lrJ
Steel starts conoding in concrcte wherl chloride level reaches 0.7 Kglm2 Steel normally does not corrode in colcrete rvhere this level is less than 0.7 Kg/mx. Oiher contamin{l)ts iDclude polluted air.
carb.nafion rcduces Ihe pH rever in concrete and ariows future deterioration steel rebaN. It has better chentical resistance, rvealher resisfance. This coatjng
of
has
penctration thro.gh
aI
rhe stratilied rust rayer, reactions and conversion
of.ust
stabilization
.
'[hc coaling is \ralcr bare(l with good covetage of inechanicai surface treatment as rusl rcltovill ir[ r.nlor.s srrch as scrapping. bruslring or powder cleaning are
I
eliminated by rust convener coating
.
Future
react with rust and forms a metallic organic protective film which
it
neutralizes the corosion process and provides an ideal solution
passivate the
to completely
tightly bound rust removing, chemically preventing it
from
Farticipating in lunher corrosion.
4.Describe the preliminary procedures in demolition of a structure.
fiivlr:aez'"n)
The step by step plocedures are as follows;
Preliminnrv Invesaigation Demolition is a highly skilled and dangerous activity in lerins ofdamage to life and
-
Property and there are certain basic factors lo consider before a contract is placed:
.
The demolition conractor should have ample experience
oflhe type ofwork to be
offered;
. . .
Fully comprehensive insurance against all risks musl be maintained at all times; An expedenced supervisor should be continuously in charge ofthe rvoqk; The contract pricc should include all safety precautions included in the reievanl building regulationsi
.
The completion date should be realistic, avoiding and need to take risks to achieve the
date. ,
Prelimin{rv Considerations
Demolition operations are the subject ofstrict legal controls - there ,s a subslantial body
of legislation
and a great deal ofcase law relating to such operations. There may aiso be
some regulations which impose additional restrictions: for example, action against nuisance such as noise and
exerts further influence, recommendatioo
aust.:fhl SSI
in thatlif
Code
of Practice for Demolition BS 6187
the demolition conrractor does not observe
rhe
of th€ Code, tliis may well influence a Courr's decision as to
his
liability in any legal proceedings.
t:
General Site
Provisiots
l0
.
A. Plant and Equirrment
8.
Musl only be operated by skilled operators lnd must be regularly serviced. ProtectiYe Clothinp Buildings where chen]icals have been stored or where asbestos, Iead paint, dust or hrmes rnay be preserrr will require specialized protective clothing, e.g, respirators, helmers, goggles. foot,,vear, gloves, erc. projecting nails, pieces of metal, etc. rcsulting fiollr dcmolition can cause accidents.
C. Shorins and Underpinnine The demolition contractor has. a legal obligation to show technical competence when caflJing out the work. When removing sections bfthe building which could have leave other parts unsalb. adequate tenlporary supports and shoring etc. nrust be provided.
D. Working Arens will
well signposted and clear warnings given that demolition work is in progress. This may include the necessity for some kind oflighting. These
E.
need ro be
Debris
Sections ofthe building must not be overloaded with debris either on suspcnded
floors or against party walls.
. F.
Weather Condition.s
These can aft'ect saf'ety. Strong winds or suspended
drifting snow against unsafe walls,
floosletc. which are unpropped nray lead to collapse.
G.
Iiloodine 'Ilre build-up ofrvater can sotnetimes
H.
be hazardous.
Oyerhc{d Cnblcs
An cranc heights erc. must be checked ag.irlst the height ofany su(ounding ovcrhead tablcs rrr avoid damage and cuttitlg offsupplies etc.
I
Sclffoldine rud tloxrdins 'l hese ntust bc conslructed and illuminated 10 the rclevant
J
building legulations.
Sccurily
-lhr
dcmolitiorr \rlc luLl iury prrtially derrrolished buildinSs Irrust be properly
secured againsl entry
K.
Dust
:
Should be kept to a minimum by spraying with water when necessary.
L. Noise Suppressors arid silencers, particularly on compressors etc., should be uSed to keep
noise levels to.a minimum.
A method statement showing how the demolirion work is lo be carried oul should be prepared and the contractors should appoint a "competent person" to supervise tlle
demolition
work.
5. nrplain
I
the demolition process of a damagcd
structure.WlW
z*d
As an inrinsic part of the construction process, elficient derBolition of structures is an important factors deserving careful consideration in the evolution of any rcdevelopment project.
Modem emphasis is on reduction redevelopment, coupled
of
construction periods
to etsure
economic
with increasing torvn cenlre regenerating calling for careful
demolition on constructed and restricted site, have resulted irr more consideration being given to demolition as part ofthe process of constuction and ledevelopment lhan was
typical in previous times. Developing a Demolition Strategv
The strategy lvill need to take into accoLrnt the method ol'construction used for lhe original building and its proximity to other burldings. strurrures and the general public. These tactors, together with location, the cost and availabilit) ol-tipping and disposal and the desirability and economics ofreuse, must be taken ir)to accounl ill the developmeDl
01'
an appropriate strategy for the demolition ofa structure.
Buildins Information Information on buildings in terms of "as built" drawings and sl,uctural details may ofien
be unavailable or unreliable, and consequently some rnvcstiButivc site and desk work
may be necessary, both to ascertain lhe way in which rhc burldrnB was originally constftrcted, and
In
1o
identily lhe stresses and sffains which exisl within il.
order Io plan the most eflcient m€thod oIdemolitron. rr rs rmnodanr ro have a lull
lL-
understanding of thc mcthod of construction and the stress panerns imposed upon the
building. Failure to do so rray result in risks to the safety ofboth ihose involved in the dcn1olition and those in close proximity to the site. Selecting Arrrrrorrriatc'l'echniques
Major's t'aclors to be considered in selecting an appropriate technique include
i ! > )
Safety of personnel and public
Working rnethods Legislationapplicable Insurance cover
Preliminary AsDects Prior to,Site DeEolition Work
> Conducting
;
a site and
building survey, witha structural bias;
I
The examinarioh of drawings and details ofexisting construction where available;
> The preparation of details and dmwings liom site survey activities where no such inlbrmation is available:
> Establishing previous use of premises. especially with regard to substanaes or substa,lces hazardous to health or
l,
safety;
flammable
!
Programlning thc sequcncc of demolition work;
> The p|eflaration ol a Method
Statement.
' Melhod slntemenl
. A de(ailed heallh and sifety method statement, produced before work starts, is essenliai tbr satc *'orking.
It
should include
a full risk
assrssment, identiry
problrnu cnJ their solrrtrnns. arld form a relerence lor lhe sire supervision'
.
The nrethod stittentcnl shouid be easy to understand, agreed by and known to all levels ofnranagerlrent itrld supervision, alld should includc such matlers as:-
'
'l hc scqLrencc arrd mcthod
ol dcmolilion or dismantling of the building or shucture
\!,ilh dctails ol'personnei access, working platlbrms and machinery reqr'rirements;
.
[)clrils ilrrd rlesrgrr ol any telnPorary suppofiillg structures to be used during
the
dcrnolition processi
'
Specilic details ol any ptc-weakening on struclures which are to be pulled down or dtrrcrlrshed rviLh exPlosivcs.
t_
.
A[angements for the protection of personnel and the public and the exclusion of unauthorized persons, with details of areas outside the site boundaries that may Occasionally need to be controlled to improve sal'ety during critical aspects of the
wOrk; .
i
Details of thq removal or making safe of electrical, gas and other services and drains;
. .
Details oftem'porary services available or required lor lhe conlractor's tlse: Details ofthe hethods for detai]ing with flammable materials and gases which may have bedn ietained or depo{ited as residue in process machinery,'pipework or
sromge: ,
.
,
Details ofmethods to establish the presence ofhidden or other substances that may behazardbus to health, the methods to be used for their disposal, a4d any necessary protective
.
equipment:
:
Arrangements for the control of site transport used for the removal qf demolition debris.
6. Describe in detail about the various dcmolition techniques.
6,1*" -"W'!
In many circumstances, buildin$ and structures should be demolished in the reverse
.
order to theh erection; although where panial demolition rs involved a nore careful evaluation ofthe nature ofthe effecls ofthe demolition is necessary.
Normally, th€ demolition contractor is able to adopt a method o, work which
> gradually reduces the height ofthe building > arranges the deliberate controlled collapse ofthe building > work can be completed at ground level.
ol structure so thal
Demolition Techniquc Sclection 'fhe choice of demolition technirluc \,ill dcpend on thc nalulc ol'lhc building or structurc and its environment. Risks to the public. operalives involved in the dcmolition process and adjacent structures and buildings should be considered.
.
Piecemeal demolition. using hand:held tools or machines. the huilding or structurc gmdually:
lo reduce the height o1_
,g
'
Dcliberate contr.ollcd collapse, demolition to be completed at ground ievel. Piecemeal Demolition bv Hsnd
Demolilion of buildings or srrufiure by hand-held tools such as elect c or poeumatic Lrrealrrs. sotncrimes hs J preliminary to using other methods, should be carried out, wherc practicable, in the revcrse order to the original construction sequence. Lifiing appliances may be necessary to hold larger structural merllbers during cutting aDd for lowering severed stmctural members and other debris. Chutes may be used to discharge debris into a vehicle or hgpper. Foundations would normally be grubbed up by excavatioo machines.
Figure l: piecemeal defiolition
81'M.rchine Sirnple roolslructurcs supported on wall plates should normaliy be demolished to the level
of wall plales by hand. bur if rhis nlay i[volve unsale working, then demolitioD totally by machine may be appropriate. Whcre ir buildinS that is to be demoiished by nraclrine is attached to another structure, the Iwo propcI.ties shoul(l be separared by the use ol harrd merhbds before the main demolition Process begins.
Whcn arry part of a building is being demolished byla bolljng machine, pusher arm or sirr)ilar equipnrent, orlly the nrachine operator and banksnran should be allowed close to
Ihc \()rking arca. Thc cabs
ol'all
nlachiues shoulJ be strong enough ro protect the
opc.Itor agitinst rlrc t-lll ol drbris ln Palticular. thc windscrcen and rooflight should ol :ihiltlc.pr.)nl nraterill ur)(l Iurftlcd by a grille ol'strc] brrc or I substantial mesh.
be
A. Balling Machinc Balling machines generally co{nprise a drag-line type crawler chassis fitted rvirh lattice crane
jib. The denblition ball, with
a
a steel anti-spin device, is suspended
from the lifting ropc and sirung by the drag rope. I
Balling should only carried out by skilled opemrives under the control of experielced supervisors using well maintained machines adequate for the prcposed duty and standjng on a iirm, level base.
The manufacturer should be consulted before a rnachine is used for balling to establish any restrictions on the type or iength
ofjib or the weighr oflhe ball.
Balling operations subject cranes to dynamic stresses and wear, ard the ball chosen should have the minimum weight necessary for effective use. In many cases, demoljtion balls ofquite light weight will be adequare.
Floors should be deinolished by dropping the ball on the highesr remaining floor and
allowing the debris t6 fall inside rhe building. The debris should be removed regularly ro preyent excessive weight accumxlatiog on the lower
floors.
I
Walls or columns can be demolished eirher by s\ringing the ball
in line with the
Draglin* Lifting rope iM
stationary
jib,
<
$/l
using the drag rope, or by slewing the jib. The ball should not swung by
derricking thejib.
I
Demolition ball
B. Hydraulic Pusher Arnl Aniculaled. hydraulically-powered pusher-arnr ntirchincs are normallv nrounted on a lracked or u,heeled chassis. and havc a toothed plalc or hook tbr applying for
l!
Hydraulic pusher arm applying a horizontal fbrce lo a wall. The machine should stand on a firm level base and apply force by a codkolled movement ofthe pusher arm,
C.
Erplosives !
Il
explosives are to be used for demolition, the pianning and execution, include pre-r.veakening. should be under the control of i person competent in these
techniques. For la.ge demolition, the competend person experienced explosive engineer: for smaller
is likely to be an
wo*. a shor-firer may
be sufficient.
When rhe use of explosives is contemplated, it is usual ro employ a techrique that will ensure lhe toral demoljtion ol the whole building by staging a controlled collapse. The explosive charges are sef and llred in a sequence that will weaken the structue in such a way that the blrilding collapses
ir
Lrpon
itsell
Although u,e tend to think ol explosives as devices producing spectacular bomb_like explosions, the use of non-explosive ,,explosives,, is now at an advanced stage. These noD-cxplosivc lechDiLlucs arc csrjcnlially expanding charges that achieve the same results as explosives but wilhour rhe noise and iritial devastating blast.
D
(JvcrturrriDg, Wire Ilopr I,u ing -lhis nrcrhod is lhc applicaliol of a horizonral lbrce at a high level by pulling rvith rvirc ropcs a iched to rvilches or vchiclcs, and allowing the lmpacl otl oVcrlurning (o dentolish lltc l]ttildiDg or slrltcturc An adcquate steel cab or cage
should prorect the winch or llle pulling vehicle and lhe opemlor.
Building over
2|
m high should nol nolmally be demolished by rope pulling.
E- lmpact Hammer and Nibblers Impact hammers nornrally have a track-
or wheel- mounted chassis, ar
articulated boom, and a heavy duty pick vibrated by hydraulic or pneumatic power to demolish concrcte or masonry.
Nibblers use a rotating action to snap lirittle materials such as concrete or masonry. ln either case, material should be removed from the top of walls or columns in courses not
Nibblers greater than 600mm in depth, sleel rejnforcement should be cut separately as necessary.
Pre-\ryeakenine
Buildings and structures normally have slructural elemerts designed to carry
sa1_ely
lhe
loading likely to be imposed during their lii'e.
As a preliminary to a deliberate controlled colllpse. afler lolds such cs turrrislings. plant and machinery have been removed, lhe demolition contmctor mnv be ablc (o wcaken some structural elenlents and remove Ih,)se new redLlndant.
Ilris frr\\cakening
is
essentially a planned exercise and nlusl bc preceded by an analysis of its possibie eflccts
on the structure until it collapscs. to ensLue lhat the strucluril rnregrit) of ihc buildjng is not jeopardized accidentalll. Insulficient inlinmation and planDing rclating ro rhe structure may resrrlt in dangcrorrs and unsafe rvork
t*
Deliberate Controlled Collarrse 'l
he deliberate collapse of the whole or part of a building or strucrure rcquires particularly high standards of planning, supervisions anrl exccution, and careful consideration of its effcct on other parts of thc struclur€ or on adjacent buildings or structures.
A surrounding clear
area and exclusion zone are required to protect both
personner and property from the fau
thrown up by the
impacl.
of the structure itself and debris which may
be
l
The collapse is usually achieved either by removing keylstructural elements (e.g. with explosive chargcs) or by wire rope puring ar a high level to overturn the structure. The possible modes of lajlure rnusl bestudied to ' , ens$e that the method selected will produce the required pattem ofcorapse, Ifthe operation is not successfur, the remaining structure may be exrremely dangerous for the completion ol- the demolition. Demolition by deliberate controlled collapse is not usually appropriate
for prestressed
concrete except for simple pre_tensioned floor planls or slabs. i
7. Describe in detail about the impulsion method ofdemolition ofstruclures. An implosion is an event where something colapses inward, because the extemar atmospheric pressu.e is greater than the ioternal pressure. For example, ifyou pumped the air ou( of a glass lube, it mighl implode. When a building is surrounded by other buildings, ir may be necessary ro ',implode,'rhe building, rhar is, make ir collapse down
irto its footprint. You
can demolish a sione \vall-with a sledgehammer, and it,s fairly easl,to lcvel a live storey building using excararors ond wrecking balls. But when you need to bring down a massive slructure. say a 20_story skyscraper you have to haul out the
big gurs. Exprosive dcnroririon is the pre|crrcd nrethod ror safery and
erficientry
derrrolishing hrgcr slrlrctures.
Ihc
basic idea
srructurc oi
l
ol erplosivc
den]oljtion is qr.rite sinrple:
If
you remove the support
huilclil]g at a certain point, the section ol.the building above that point wjll l'irll dorvn on the pa ol'the building below that point. If this upper section is heavy
cnough.
it
N,ill collide with rhc lower part with sui.licient force to catrse significant Lllnrage 1'hc explosivcs arc.jUsr lhe trigger lor thc delnolition. It,s gravity that brings the hLriltiing rlorr
rr
I
Demolition blasters lo.d explosives on several different levels of rhe building so thar the building strucrure falls down on itselfir nlrltiple poinrs. Wherr everything is plarured and executed coffectly, the total danage of the explosives and falliog building material
IS
sulficient to collapse the structure entirely, so clean_up crews are left with only a pile
of
rubble.
Methodolosy
In order to dcmolish a building salily,
nust nlap out each eleDlent of lhe implosion ahead o[ time. The Ir\r step is t{) examine xr(hitechrrrl bl[eprlnfs of the building, if they can be located, to determine how the buildirg is pur together. blasters
Next, the blaster crcw touls the building (Several times). jofling down notes aboul the support structurc on each floor. Once they have gathered all the ralv dala lhey need. the blasters hamher out a plan of attack_ Drawing from past experiences rvith sinilar buildings, they decide what explosives to use, where to position thenr in rhe buildiDg and how 10 tr.me their detonations. In some cascs, the blasters may develop 3_D computer model of the shucture so th€y can test out their plan ahead of time in a vitual world. The mai. challenge in bringing a building down is conrrojling which way ir falls. Ideally, a blasting crcw will be able to tumble the building over on one side, into a parking Jot or Other open area. This sort of biast is 0re easiest to execute. and it js generally the safest way to go_ Tipping a building over is something like felljng a tree. To topple &e building to the north, the blasters detonate:expiosives on the north side ofthe building flrst, in the same way you wourd chop into aitree liom rhe nofth side ifyou wanted it ro faii in rhar direction. Blasters may also s.cu.i steel cables to support coiumns in the building, so that they are pulled a cenain way as they crumble. Sorrerimes, though, a building is surounded by structurcs that must be preserved. ln this case. the blasters proceed lvith a true implosion, demolishing the building so tlut it collapses srraight down inro irs own footprint (rhe total area at the base ofthe building). This feal requires such skil rhar only a handfulofdemolition companies in the rvorld willatrempt ir.
Blasters approach each projecr a liftie dift-erently, but rhe basic idea is lo lhink of the building as a collection of separate towers. l.he blasters sel the expiosives so lhat each "tower" f'alis toward the center of thc building, in rcughly the samc wav thal lhc) lvould se1 the exprosives ro toppre a singre slr.clurr, to lhe sidc. whcn Ihe exprosives are
24
detonared
in rhe right o.der, rhc roppring towers cralh against each other, and ari ofthe the buirding. Anorher.op,,""
:::::::l::l:::,T.cenrerof the center ofthe building befo.e the other c",,,-"" Accordine to Brent Branchard. Protect documentation services
olthe
a
corlrmns at
",,;f#[::'#'::T:::i;::'::::il,,ilf* virtually every building
any given building, there is any number Blanchard notes the demolition
Hayes Homes,
*..",*"",re
"^:,r", *^ .-
in the world is unique. ana for of ways a blasting crew migtrr Uring lt aown.
l0-buiiding housing pro.iecr in Newark, New Jersey, which was
dcmolished in three separate phases over the couse ofthree years. ,a aif"r"rrt Ut*ting ilrm performed each phase,,, Blanchand ,,and says, alrhough all of the buildings were identical, each blaster chose a slighlly differenr rype of explosive and loaded varying numbers of suppon columns. Th the buildinss down in different marhemaricar sequences, ,":^l-^*:1^::".:qhl yrng amounts of time factored in between each building's
*,,,
collapse.,,
Generally speaking. brasters wilr exprode trrc maior suppon corumns on the rower floors iirst and then a t'e!v upper stories. In a 2o-story building, for example, the blasters might blorv rhe columns on the firsl and second floor, as well as tle l2th and l5th floors. In most cases, blowing the support struclures on the Iower fioors is sufficient lbr collapsing the building, but loading columns on upper floors helps break the building material into srrarrer pieces as ir
rh1s.
This nrakes fbr.easier clean_up loilowing the biast. Once rhe biasters have figued out holv ro set up an inrplosjon, it's time to prepare the building. In the next section, we,ll find out whar,s involved in predetonalion prepping and see how blastqs rig the explosives lor a preciscly timed demoiition. I
S
Discuss in dctair rbout any casc study or dcrnorition ofstructures. ll(]rs SC l,Lrne convcnccl a board ol.Olficers on 4..7)997 at General Area of old KV Ilolilrlrrn {'or)rlrl-\. t,,.u dcr;rh;rJ l.ur asses,ir,,, rhF r_-,,i.-^,--, ^ ^. group oi brrircrings vicrc convening
1rIp,s.
"li)
rl
rrrr
asscss ritc
;: ";j:"i:lrx;|;;;t;ffi;.;:;il'i:ff hclow:
ir rlr, ti.,.rrl fr,,(ecrlir.gs i5quolcd
rr(l.ir(.rnc,t ()l.spcci:rl reprrrs r(, b,ildints nnJ ro.*ls and recommend
demolition ofunsafe / uneconomical buildings at old KV Bolaram Complex"
I,INDINGS OF TIIE BOAR,D: The Board found thot all the buitdings located in lhe complex were
of
1850 to
with brick masonary and mud morta. and served more than thcir expected lifc. The buildings were in occupatio! by Kendriya {idyalaya, Bolaram for a considerable time and were vacated during 1989-90, All buildings were in bad shape 1910 vintage consfucted
due to vintage and needed extensive repairs.
RECOMMENDATIONS OF THE BOARD: The Board recommended urgent special repairs buildings in order to
b
to
13 permanent
/
Temporary
ng these buildings to habitable condilion and to ensue structural
safety. The special repairs was estimated to be Rs.40.18 lakhs.
The board also recommended six buildings for demolition as they lvere found to be in
dilapidated condition
and unsafe and beyond economical rcpairs The
board
recommended sanction of demolition of the said six buildings and to iniliate new u'orks
for recoupment of these buildings through a separate board of officers urgently ( as the work on the new loilets is to be completed by lhe time ofcompletion ofthe proposed special repairs so that troops occupying the buildings afler special repairs will have toilel
facilities )
Based
on the
recommendations
of the Board, the GOC-in-C
S.C. vide lener
No:300050/9712/2(wks) dated 25.10.1997 accepted necessily and accorded Admin
Approval for the special repairs at an estimated cosl
of 42.05
lakhs. The Admin
Approval included the demolition ofold buildings also as recommended by the Board.
32 weeks time was given for complelion of work. Based on the sanclion a conlracl agre€ment was concluded CE(Fysy Hyd / Sec
for Rs.43-45 lakes by CE(Fys) I-lyd zone vrde CA
/ l6 of97-98. In addilion,
bring the buildings into
use. i
N-o:
the following wor*s were also executed to
CA / Sanction No
& Date
ature of work done
l.cwE(s)/sEC-E/M/25 97
2
16.63 lakhs
sewage disposal
HQ
ASA
No:4045/0TM/Q3W
dt.1.12.97
and CA
etc
(capi
1.97 lakhs
Repairs to Tem Buildings T.12 (Revenr
3,20lakhs
Repairs to T Buildings T. I2-l (Reveuu
No:
HQ ASA letter
No:4045/oTM/Q3w(i) dt.3.12.9'1
3.
of ex ilcctrical, water supply Augnentation
-98
work)
HQASA
ter
vision
No:4093/Q3 dr.9.5.98
of
Gate for
I Coliege (Revenue Work)
otal:24.60 Iakhs
Thus a total sum of I{s.68.05 lakhs (43.45 + 24.60 lakhs) was spent on the buildings in order to make them liabitable. The work was completed in all respects irr Jan ,99 and GE(S) Secunderabad vide iris lener No:23 I I l2S4/E2 d,ated 28.1.99 requested the station HQrs ro.insrruct the users concemed to take over the accommodation from llEs. The RAO MES Secunderabad, during review of the GE's accounts found it curious that a huge sunr of Rp.68 larkhs rvas spenr on barracks lying vacanr for alnrost l0 yeals and therelbre probe[ the ,]atter riorn the GE/CWE records. The detailed examination ofthe rocords brought out the loilowing interesting l'acls:
1
flQrs convening order dated 4.6.97 to
assess the requirement
ofspecial repairs to
thc unuscd barlacks rvhich ultimately resrrlred in spending ol.more than 6g lakhs rrn unused blrrlcks was only s 5squgl tO the proposal to establish an Army Dental CnilcSc Ct ScirrDdcrcb.d to he hducarioD Socicry
2
ru
(AWES).
by a leginrculal ilstilurion viz.. army Welfare :
As lhc proicct invol,,,ccl consiclerablc expcndirure, it was proposed to house the collcgc inirrirlll in llre unuscd barracks b1, crrr.rying out special repairs and shift to pcrrrrrrrrcrrt
Ircatiol lllcl
3.
The cost, timie and all olher aspecls involved in the matler were brought in ihe
CWE Secunderabad Engineers appreciation datcd 19.5.97 (copy enclosed Annexure -
as
A) |
4. The need to rbappropriate the land
& buildings for use by the Army D*rtal College
was clearly brought our by rhe Engineering Appreciation repon ofCWE. 5.
The necessary reappropriation sanction was also called for from Station HQrs by CWE Secunderabad vide their letter No:24 225t11lE2 dated
2
8.
I
0.97 imnred iately
after issue of:Admin Approval dated 25.x.97 for which no aclion was laken by the
Admin Authorities-
6. Neither the Board
proceedings nor the Admin Approval and other' subsequent
sanctions brotrght out the purpose ofthe whole.exercise thus effectivelY concealing the mafter from audil
In thc light of the above findings, the RAO(MES)
Secunderabad placed
lhe entire
expenditure under objection and reported the matter to CDA Secunherabad for further necessary action
9. Explain the techniqucs av{ilabl€ for thc protection
ofrebar
(Nov lDec 2012)
Techniques for repair & dcmolition Rust Eliminator:
/ '/ '/ "/
Rust eliminator is a material which is liquid state f'or cleaning rebars and steel surface-
No chloride content. No chance ofenhancing corrosion. Acts for both ferrous ard non-firous r'rletals.
How to lix rebar rust: Rebar-reinforcing bar, it is nrade from carbon slcel. a nlaterial that is prone ro rusting.
Fixing the rust is possible by hking
Things you will nced:
'/ /
Wire brush-
"/
Commercial rusl remover
Rubber gloves.
a
few sleps.
.r4 / r' /
Paper towels.
Paint brush. Primer.
lnstructions (or) procedure to lix rebar rust: '/ Scrub all the rusting by the use ofwire brush.
/
y'
r' /
Put on rubber gloves before pouring a commercial rust remover Onto a paper towel. Apply the rust lemover to all rusted areas ofthe rebar. Leave rust remover on rebar lor l0 to 15 minutes. Clean offthe rust with paper towels.
Use a paint brush ro apply primer to protect the rebar frolll rusting funhcr allows primer to dry. i
Physical propbrtics of rust elimihator;
/ Appearince : Brown colour liquid ,/ Specific gravity : 1.20 + 0.03 r' Nature : Acid / pH : L5 - 2.3 / Available in 500m1 & lOO0ml pack in marker (or) shops. Homemade: Rust eliminrtor
r'
Vinegar and lenmn _iuice (or) white vinegar and lemon
juice.
:
'/
The substance rvlrich has aci
'/ '/ /
Conrbine
I
cup ol vinegar with
l
cup oflenronjuice.
Soak a sponge in the mixlure and use it to rub your rusty object clean.
You nlay want to usc plastic gloves for this task.
Applicrtion (or) Applicrbic rreas:
'/
Mainrcnance o|nrild stcel srruitures like intcrior/exterior surface of tanks and vessels
v
$rlcr pipcs lines. shulterrng ploles and other corrodej steel surface. fnrcks. e rs unLl urhcr tchiclcs ]
'/
Irence, ririlings illld walls.
t:
i
