Case Study
Lukhnow Tulip INN
Entry Canopies at Tulip Star Hotel, Lucknow
Tensile Fabric Roof at Tulip Star Hotel, Lucknow
Tensile Fabric Roof installation at Tulip Star Hotel, Lucknow
Project Engineer Aakruti Tenso structures & Façade Pvt., Mumbai, Maharastra.
Client Awadh Developers Pvt. Ltd., Lukhnow, Uttar Pradesh U. P.
Date/month of installation 25th June 2013
Requirement Entry canopies in Tensile Fabric & pathways connecting 2 Hotel Buildings
Size 4573
Span 22 meters X (22 meters - 12 meters)
Design Design detailling Team, Aakruti Tenso structures & Façade Pvt. Ltd.
Fabrication By our team of enginners & craftmen at our Fabrication shop
Installation Inhouse team from Aakruti Tenso structures.
Requirements

In the Heart of the City of Nawabs, established Business house operating 4-star hotel Tulip Star Plan an expansion with added capacity of 200 Rooms in the 5-star category in an open plot attached to existing Hotel.

The requirement was to seamlessly integrate old & new fascility with all wheather roof covering to allow all season movements for Gusest & service staff.

The chellenge here was to be within frame work of local development control body regulations, apart from strict restrictions from fire departments interms of minimum height of the structure, clear unobstructed entry ways for fire engine movements in case of emergency.

There was a huge off set between old buiding & new building due to set back rules for the new developments. Hence the entry ways of the 2 structures were out of line by atleast 10 meters. There were no CAD structural details available for now cladded old building. Also there were no drawings prepared with details showing both old & new buildings. As we operate from Mumbai Design office , In a limited time available during visit of our director, Mr. Anil Shah it was not possible to carry out detailled survey. The customer though had an Architectural department apart from team of site engineers , could not allocate resources to give us details of existing & proposed structures.

Challenge

In Absance any structural details for old Buildings, Challenge was to design a Tensile fabric roof with almost no structural columns along Fire engine pathway , at the same time taking No support from old Building.The civil work for the New building did not follow best workmanship practices. So the even bigger challenge was to fabricate modules at our workshops & assemble seamlessly at site without modification and delay. The unprofessional Project team, PMC team, supporting Admin team & overall culture of the hospitality company made things worse.

Area

The Total open Area to be covered was roughly 425 sq. meters.

Solution

We smartly divided the Area in to2 different zones. Rather then trying to align the skewed enterances we suggested 2 different Fabric canopies individually aligned to respective Hotel Buildings. The connection was established with series of overlapping Inverted cones again in Tensile Architecture.

As we must Highlight entry canopy of the New Hotel Building, we suggested Tensile membrane Architectural design form having 2 inter connected , slanted cones . The Hotel orientation demanded Trapezoidal shaped entry canopy divided in to 2 non equal connected conical Fabric structures.

Design /Analysis

The entry canopy was designed to start from the New bulding from a beam running across the suggested entry leading to Reception lobby. Total span of the canopy was 20 meters, with an intermediate RCC column right in the middle. Sufficient slope of 200 mm( angle ) was introduced along the length of canopy so that water can move to the outer edges of the entry canopy. The Tensile fabric canopy was supported on the outer edges by 3 Steel columns which intern were fixed on the RCC beam casted along the boundr of the proposed Hotel Plot. The Height difference of 1 meter was introduced in the canopy with over-hangging span varing from 12 meters to 22 meters.

Detailled Analysis of the structure was carried out with Internationally acknoledged FEM software ,.In absence of Local codes for Governing construction of Tensile membrane structures, British standards were followed to generate wind loads depending on geometry, height of structure, height from sea level, dist from sea, surface roughness, tropology, etc .The wind pressure for wind speed of 110 km/ Hr , followed by various factors to take care of the variable mentioned above were used.

Once structure was analysed, the dimensional detailling of each individual structural members were carried out after STAAD analysis depending on the max. load generated in load combinations.Auto cadd 2011 was used for Detailling- drafting purposes.

Primary Structure

The primary structure was selected to be hollow tubular square sections 150 X 150 mm in size , for all the beams. where as vertical columns were fabricated from round holllow section of 219 mm dia X 8 mm thickness. The top flat edge of the 150 X 150 mm beam was smartly used to fix the fabric fixed edges & electrical supply wires for RGB LED lighting.

The top ring Dia 600 mm supported on Dia 115 mm Mast which in turn was supported by 4 radial members from each of the corner, having Dia 140 mm through a Sliding joint in the center to enable pretensioning while Tensile membrane installation.

Fabric details

The Ferrari 902 S , PVC coated fabric was patterned Radially in all 30 / 36 patterns , depending on the size of the cone .To absorb higher stresses towards the Ring center the fabric was reinforced with another layer of 902S membrane patterned in floral shape.

The fabric was fixed on the Top edge of the square Beams with the help of clamping stainless steel strips of 40 mm X 8 mm , separated by Neoperene rubber Gaskets , with help of Self threading extra large screws. The fabric was clamped to the central Beil Ring with help of Stainless steel Nut bolts.

Installation

The Foundations were the responsibilities of the purchaser. The steel structure was pre- fabricated in modules in our workshop based on the details received. The Exact Foundations details were send to purchaser to cast the foundations in advance. The who;e modules were transported to the site. There were Huge deviations in the RCC structures of the New Hotel building including Non aligned beam on which the canopy would start. The Height of the beam was different from what was conveyed to us. The design was ammended on the spot. Acordingly the ready modules were corrected on the spot. The foundation was casted AFTER the material reached the site. The scafoldings were simply not in the right conditions. The Avaibility of Cranes/Hydra services were limited.The rentals wre on a shift or a day basis rather then on Hourly basis. We still managed to errect the structure in an record time of 7 days. We errected inverted umbrellas steel structure even though the foundations were just not casted.

We deputed our Painting team to complete the epoxy coating as planned. We were running against time specially with monsoon fast approaching . We completed painting. Took the site final re-survey before remodelling for patterning- welding. The Fabric now welded was delivered in next 10 days. We send team again for the final Tensile Membrane installation.The Hotel was far from ready. as soon as our team landed , the first seasonal rains started lashing the city. Our challenges to have a safe accident free installtion multiplied. Clean uncluttered floor area to spread - prepare fabric was just not available. vehicles from employees & Vendors made our task most difficult. The Purchasers were in different world dealing with other site related issues as the rains made their life miserable.

We requested for a crane which never arrived. We were determined to complete the installation. As soon as rains stopped we prepared floors, laid plastic sheets, the fabric was unwrapped, the beil ring was fixed. We called the crane & 48 hours non- stop installation began. The lifting & fixing the Top rings ( 2 rings on the same single fabric ) took more then 8 hours. we immediately started fixing the fabric on to the RCC beam first.The rains at regular interwals would make our job much more complicated. We managed to clamp all the fabric edges in 30 hours. we lifted the fabric up to avaoid ponding. We took a break at 4 a.m. so that our team could take a short sleep

When we got up at 8 a.m., It had already rained. As the Top rings were not fully lifted, the water ponding on 2 areas. One behind the cones towards the hotel building & all along the lower edge. Luckily we were up in nick of time. It took us 2 hours to remove more then 1000 liters of water from the top of fabric. We lifted fabric further up with help of Hydraulic equipments, this removed all the water from the canopy.And we took a sigh of relief. The rest of Installation was not so critical as inverted cones have no possibility of ponding. As the conical fabric was mechanically joined radially at the site with primary structure assembled, it took more then 8 hours to complete each cone installation. Never the less it was a great challenging experience for us to install the fabric in an unfriendly conditions. It has taught us many lessons. We have incorporated many design changes in all our future projects so that we can keep installation pace at highest & Avoid troubles in case it rains. Also we have learnt quite a few lessons specially managing outstation projects in smaller cities/Towns.

Achivements

The project was completed well within time span of 45 days.The steel structure was installed at site in 7 Days even in unfavourable conditions. The Fabric Installation was carried out in Rainy whether.Final fabric Installation took just 72 hours back to back.

Tensile Fabric Structure Installation at Tulip Star Hotel, Lucknow
Final Tensile Fabric Roof Installation at Tulip Star Hotel, Lucknow

Our Tensile Fabric structures in, Mumbai, Goa, Indore, Raipur, Raigadh, Kolhapur, Lukhnow, Hyderabad, Bangalore, Aurangabad, Guwahati, Ranchi, Chennai, Bhuj, Rajkot, Bilaspur, Patna, Gandhidham, Coimbatore, Pune, Aurangabad, Solapur, Nagpur, Vapi, Valsad, Jaipur, Dehradun, Mussoorie, Bhopal, Vizag, Amritsar, Ludhiana, Chandigarh, Kolkata, Mysore.

Multiple projects in states like, Maharashtra, Karnataka, Gujarat, Madhya Pradesh (M.P.), Chhattisgarh, Rajasthan, Uttar Pradesh (U.P.), Tamil Nadu, Andhra Pradesh (A.P.), Orissa, Delhi NC R, West Bengal, and Nagaland.

Fabric Roofing for : Stadiums, food courts, Amphitheatres, Skylights/ Atrium's, Walkways, Car Park, Entry Canopies, sales pavilion, Gazebos, Resorts, clubhouses, events, educational institutes, schools, International institutes, universities, campus, outdoor structures, offices, corporate buildings,....