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Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
Phase I Conservation
Works
Former British Residency,
University College for
Women, Koti, Hyderabad
Progress Report
June 2016
WORLD
MONUMENTS
FUND
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
CONSULTANTS
Ar. Ravi Gundu Rao
Ar. B. Sarath Chandra
Ar. Anuradha Naik
Ar. Tapan Mittal Deshpande
Ar. Apoorva Pillay
Ar. Anshul Rawat
JEERNODHAR CONSERAVTORS PVT. LTD.
Nilesh Thakkar
Gautam Ramesh
WORLD
MONUMENTS
FUND
STATE ARCHAEOLOGY DEPARTMENT
N.R. Visalatchy, Director
Raheem Shah, Deputy Director
OSMANIA UNIVERSITY
UNIVERSITY COLLEGE FOR WOMEN
Prof. B.T. Seetha, Principal
Prof. Y.L. Srinivas, PRO
BUILDING DIVISION
B.L.N. Reddy, Consulting Chief Engineer
Srinivas Reddy, Executive Engineer (EE)
V. Devapriya, Dy EE
D. Anjali, AEE
PROJECT TEAM
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
Items of Work
1. Clearance & Dismantling works
Item No. 5 Dismantling wooden structural system: timber in roofs and floors
Item No. 3 Dismantling brickwork near western balcony
Item No. 11 Clean removal of old plaster from walls
2. Structural consolidation
Item No. 5 Consolidation of deteriorated wooden box girders in western balcony
Item No. 5 Restoration of wooden structural system in Darbar hall balcony
Item No. 23 Restoration of old deteriorated gutter channel on terrace
Item No. 24 Provision of teakwood for structural restoration
Item No. 46 Recycling old wood dismantled from the building for restoration purposes
3. Consolidation works
Item No. 39 Stitching of cracks using stone lintels (50x150x1000mm)
Item No. 40 Stitching of cracks using SS clippings in western balcony
Item No. 42 Restoration of old decorative masonry cornice in lime and brick, in western balcony
4. Protection & Finishing works
Item No. 26 Providing Anti termite treatment as per IS 6315
Item No. 30 Providing and applying steel protection coating
Item No. 35 Plastering with Lime Surkhi plaster of thickness 25mm including preparation of mortar
Item No. 36 Additional thickness of 20mm of Lime plaster as per the original thickness of the plaster
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I BAR CHART SHOWING STATUS OF WORK
0
50
100
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300
jack
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Scaf
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Cen
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for
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h
mad
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terr
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con
stru
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layi
ng
lime
con
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e
pro
visi
on
of
teak
wo
od
fo
r m
ain
str
uc.
Bea
ms
pro
visi
on
of
anti
-ter
mit
e
in s
itu
ss
cap
pin
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ith
ep
oxy
fo
r jo
ists
stee
l pro
tect
ion
co
atin
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ork
fo
r su
per
stru
ctu
re
pla
ster
ing
wit
h li
me
surk
hi p
last
er 2
5m
m
add
itio
nal
th
ickn
ess
of
lime
pla
ster
20
mm
gro
uti
ng
of
mas
on
ry c
rack
s
Stit
chin
g o
f cr
acks
usi
ng
sto
ne
linte
ls
Stit
chin
g o
f m
aso
nry
cra
cks
wit
h s
s cl
ipp
ings
rem
ova
l & r
esto
rati
on
of
dec
ayed
tim
ber
sec
tio
ns
Rec
ylin
g o
ld w
oo
d d
ism
antl
ed f
rom
th
e b
uild
ing
exceeded
remaining
completed
( In % )
Finished items of work
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I LOWER GROUND FLOOR
STAGES OF WORK → 1
Different samples of lime plaster finish have been made for the finalfinish of lime plaster on the walls in lower ground floor.Each lime plaster sample has a mixture of lime, sand and brick powderin varying proportions, ground for different durations, which givesdifferent colours and textures to the plaster finish.Since the basement has comparatively lesser light and ventilation, thefollowing option are being debated:(a) Providing a comparatively rougher finish to the lime plaster. This is
because smoother the plaster finish, lesser the breathability andhence will take much longer for any residual moisture in the wallsto evaporate, especially during monsoons.
(b) Retaining a smoother finish to the lime plaster – matching originaland thus retaining authenticity. For this the existing ventilation ofthe lower ground floor is being evaluated.
SAMPLES OF LIME PLASTER FINISH
Sample 1,2
Sample 3 Sample 5,6Sample 4
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
STAGES OF WORK → 1
The teak wood beam in the balcony is encased in box girders made of strips of wood nailed together, and packed with MSchicken wire mesh plastered with lime mortar. The lime cornice covering the box girder was damaged, and due to waterseepage the wooden strips of the girder and the MS chicken mesh were deteriorated completely.
3
The lime plaster and mesh were dismantled carefully, followedby the complete removal of wooden strips from three sides ofthe beam
Consolidation:New strips of wood (2’10”x1/2”) are nailed together to thesides of the beam. A coat of anti-termite and black japan each(applied in concealed areas), is applied to the wood.After the coats dry, SS chicken wire mesh is fixed with nails onthe three exposed sides of the box girder.A coat of Epibond (bonding agent) is applied over the threesurfaces where wire mesh is fixed, to ensure bonding betweenthe wood, mesh and lime plaster.Once Epibond dries, lime plaster (1:3) is applied to the surface.
Duration of work: 24 daysStatus: completed
UPPER GROUND FLOOR
STRUCTURAL CONSOLIDATION- BOX GIRDERS
Wooden strips nailed to the girder Black japan applied to the wooden strips of box girders
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
3
The rough layer of lime mortar is levelledevenly. After this layer dries finish plaster(1:2) is used to make the final profile ofthe cornice.
CONSOLIDATION- DECORATIVE CORNICE
STAGES OF WORK → 1 2
After the consolidation of box girders, a rough coat of limeplaster (1:3) is applied on the box girder.
The chicken wire mesh holds the plaster together with thewooden box girder.
Duration of work: 15 daysStatus: completed
UPPER GROUND FLOOR
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I FIRST FLOOR
STAGES OF WORK → 1
The wooden floor planks were dismantled carefullyfrom the balcony to assess the condition of thestructural wooden members. Based on theassessment, the structural consolidation work willbe proceeded.
Starting of work: 25.06.2016Status: on-going
2
The frame of the balcony is made of main beams and (secondary) joists. Oneend of the wooden members is fixed in the in the masonry. The free end ofthe balcony has a tie beam running which is held in place by the beams.The joists (to hold the flooring) rest on this tie beam. The wooden floorplanks were fixed on top of rafters with 8mm gauge MS screws.
After the assessment, it was found that there was a bend of 1” in thejoists, towards the free end. In order to rectify the bend, the tie beam atthe free end, it was proposed to be raised by 1” and then the joists shouldbe fixed in the tie beam.
To remove and replace the damaged joists, the cast iron railing wasdismantled carefully, as the free ends of the joists resting on the tie beamwere located below the railing.
STRUCTURAL CONSOLIDATION- DARBAR HALL BALCONY
Darbar Hall balcony after the removal of metal railing
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I FIRST FLOOR
CONSOLIDATION- LIME PLASTERING
STAGES OF WORK → 1 2
Due to water seepage from terrace in the first floor rooms,the plaster above cornice level had become loose and hadwater marks.
The loose lime plaster was scraped off completely.The brick work was consolidated with ¾” thick limeplaster (1:3).
Duration of work: 6 DaysStatus: completed
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
2 3
The overhang ends of the MS
corrugated roofing sheets were
cut till 1’ to provide
accessibility to fix an additional
support to fix the new lead
sheet.
New purlins (40mmx75mm) are fixed at the end of the oldcorrugated sheets, which rests on the masonry column.The thickness of the wooden members is 6”wide, on whichthe new sheet will rest.After discussions and trials, a decision was taken to use 2mmlead sheets as it is less prone to corrosion and has betterworkability. The new lead sheet will be laid in the oldgutter channel along its profile. One end of the lead sheetwill be inserted 2”inside the wall while the other end willbe bent and fixed along the length of new purlins.
Note:Refer drawing ‘Cross section of gutter’ on Slide No. 13
STAGES OF WORK → BEFORE 1
The existing gutterchannel on terrace, hadthree layers of metalsheets:Top most – aluminiumBottom two- MS sheets
The picture shows the section ofthe old gutter.The old metal sheets weredismantled up to a 2’to inspect the condition andjoinery detail of the sheets.The metal sheets rest on ahorizontal wooden memberbelow.
Rusted metal gutter sheets
Starting of work: 08.05.2016Status: On-going
TERRACE
STRUCTURAL CONSOLIDATION- GUTTER
MS corrugated roofing sheet
MS corrugated sheet overhang removed from the ends
New wooden purlin
(40mmx75mm)
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
4 5
Due to less variation in the slope of gutter from the highest point to the lowest point of drainage, there was an insufficient flow of water which caused water stagnation at certain points.Due to seepage of this water, the wooden gutter sections were deteriorated which eventually led to dampness in the rooms below terrace level and in the entrance porch.The proposal was to rework the slope of gutterchannel by providing wooden members as required atthe base channel, to give adequate slope to ensurequick and complete drainage of the water
Small wooden pieces of size
1 ½“x ½” x 9” were fixed at the
base of the gutter, on top of the
metal sheets.
This provided a base for fixing
wooden members for modifying
the existing slope (1:2 from end
of shorter length of gutter to the
corner end of the longer length
of gutter; 1:3 from the centre of
the gutter to the corners).
6 7
After the laying of wooden planks in the gutter, they are
fixed with the base of the gutter by screws of 8mm dia.
Once the wood is fixed, lead sheet is placed on it by
hammering it, to attain the desired profile of the gutter.
There are no punctures made once the sheet is
hammered, in order to avoid any water percolation, only
the bearing of lead sheet inside the wall is fixed with
screws.
The lead sheet is
bend along the
length of the gutter
towards inside to
prevent any
dislocation.
Gutter channel after fixing of lead sheet
TERRACE
New wooden members fixed to raise the height
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
STAGES OF WORK → BEFORE 1
The western side of the gutter
has a brick wall below. The
metal gutter sheets rest on the
brick wall. Through this area of
gutter, there was excessive
water seepage during rainfall,
damaging the decorative
cornice work in the entrance
porch.
Metal gutter sheets were
removed carefully to do
lime concrete work on the
brick wall. Lime concrete
would ensure waterproof-
-ing of the gutter base.
2 3
A layer of lime
concrete was laid on
brick wall, giving a
Slope of 1:6 at a
distance of 5m from
the south towards the
north.
After the setting of lime
concrete, the old gutter
sheets were replaced in the
gutter channel. The lead
sheets were hammered to
attain the desired shape
and profile of the proposed
gutter.
Starting of work: 06.06.2016Status: completed
TERRACE
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I LONGITUDINAL SECTION & DETAIL OF GUTTER
Restoration of Darbar Hall at University College for Women, Koti, Hyderabad Phase I
STAGES OF WORK → 1 2
The wall adjacent to the metal staircase on terrace, had astructural crack, which was consolidated with masonrycrack stitching using brick bats and lime mortar. Afterstructural consolidation, a fresh layer of lime plaster (1:3)was applied to the surface.
Pipes were inserted in the wall for further grouting, toconsolidate fine cracks inside the wall.
The removal of old plaster, revealed the existence of a nicheInside the wall, which was lined with terracotta tiles (chadurbilla).The size of the niche is 4”x6.25”.There were small pieces of wood found in the nicheThere is a horizontal cornice band on the wall, which is half wayAcross the length of the wall. Thus the niches may be indicative ofcontinued presence of cornice band - which may have beendismantled to accommodate the staircase.
TERRACE
CONSOLIDATION- LIME PLASTERING
Duration of work: 3 daysStatus: Completed
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