Cassiopea Fashions Ltd. Cassiopea Apparels Ltd.

Transcription

1 1 Cassiopea Fashions Ltd. Cassiopea Apparels Ltd. Bokran, Monipur, Vabanipur, Gazipur. ( , ) 15 April 2014

2 2 Observations Made

3 3 No apparent stability system

4 Steel Building 6 th floor Bracing members in Steel Building have not been constructed from ground to 3 rd floor. No other apparent stability system provided. Frame does not appear sufficient to provide moment action. G-2 nd floor (double-height space) No apparent stability system

5 Steel Building Ground, first and typical floor drawings all show vertical bracing. Building is not constructed in line with the structural or permit drawings. Drawings indicate that the building was constructed to 4 storeys and a 3 storey extension was later added No bracing is present in the original 4-storey construction No apparent stability system

6 Main Building Single lift core with concrete shear walls does not appear to be sufficient to stabilise the building. No shear walls to other side of movement joint. Beam and slab construction at G and 1 st floor. All other floors are flat slab. No apparent stability system Movement joint

7 7 Missing bracing

8 Bracing members in Fabric Warehouse have been disconnected Bracing members in Steel Building have been removed from 5 th and 6 th floor Missing bracing

9 9 Non-engineered structures

10 Trusses rest on glass partition, which is leaning and is at risk of collapse. In Dry Process Area, structure appears to be non-engineered. No apparent consideration of stability or design of connections and member sizes appear inadequate. Non-engineered structures

11 Non-engineered structures Partially propped cantilevering canopy over entrance to Main Building has no apparent lateral stability system (in plane bracing). Members appear undersized to resist high wind loads

12 Compressor & Pump Room structure appears nonengineered, with no apparent stability system and some trusses lack any diagonal members. Truss sections supported on rebar in Power House Non-engineered structures

13 13 Cracking in the slabs and perimeter beams

14 Evidence of previous repairs noted at first floor. Flexural cracking to slabs on all floors of Main Building. Cracking in the slabs and beams 14

15 In Main Building, diagonal cracking to some perimeter beams is apparent at column locations. Cracking in the slabs and beams 15

16 16 High loading on floors

17 High loading on floors 17 On 6 th floor of Steel Building, water tanks are temporarily located. Each tank has a capacity of 10,000L but are apparently maintained at 1/3 full. However, no system appears to be in place to prevent overfilling and consequently overloading.

18 18 Water build-up on slabs

19 Standing water on slab on ground floor of Main Building has washed away concrete fines, creating corrosion risk Standing water on slab under water storage tanks on 6th floor of Steel Building, creating corrosion risk Water build-up on slabs 19

20 20 Welding in Steel Building

21 Steel I-sections are made from lengths of plate, welded into longer lengths and then welded into I-shape. In some cases, plates are not fully aligned. Lighting arrays and other services have been later welded to steel structure. Stiffeners are generally tackwelded. Beams are connected to deck through intermittent selftapping screws. No composite action is present. Welding in Steel Building 21

22 22 Proposed additional floor in Main Building

23 New concrete extension on roof of Main Building is proposed (as per permit and structural drawings) Steel canopies on roof are in the process of being dismantled. Proposed additional floor 23

24 24 Priority Actions

25 Problems Observed 1. No apparent stability system in Steel Building or Main Building. 2. Non-engineered structures Dry Process, entrance canopy to Main Building, Power House and Compressor & Pump Room: stability, connection, member sizes issues. 3. Cracks in slabs and beams in Main Building. 4. Missing vertical bracing in Steel Building and Fabric Warehouse. 5. High loading on slab from water tanks in Steel Building. 6. Water build-up on slabs in Main Building and Steel Building. 7. Welding in Steel Building. 8. Proposed additional concrete floor to replace steel canopy. 25

26 Item No. Observation Recommended Action Plan Recommended Timeline No apparent stability system in Steel Building or Main Building. Buildings to be assessed by Building Engineer and upgraded as required No apparent stability system in Steel Building or Main Building. Buildings to be assessed by Building Engineer and upgraded as required No apparent stability system in Steel Building or Main Building. Buildings to be assessed by Building Engineer and upgraded as required Engage Building Engineer to review stability of Steel Building and Main Building. In Steel Building, diagonal bracing to be reinstated as shown on the structural drawings, with any upgrades as specified by the Building Engineer Complete the reinstatement of bracing and upgrades to stability system of Steel Building and Main Building as specified by Building Engineer. Dry Process, entrance canopy to Main Building, Power The above structures should be designed and upgraded to House and Compressor & support code vertical and wind loads by the Building Pump Room are nonengineered structures. Engineer, or they should be vacated and removed. Dry Process, entrance canopy to Main Building, Power House and Compressor & Structures to be upgraded as per building engineers design. Pump Room are nonengineered structures. Dry Process, entrance canopy to Main Building, Power House and Compressor & Engineer to submit design for revised structures, if required. Pump Room are nonengineered structures. 6-weeks 6-weeks 6-months 6-weeks 6-weeks 6-months 26

27 Item No. Observation Recommended Action Plan Recommended Timeline 7 Cracks in slabs of Main Building. Sections of plaster finish to beams and slabs to be removed to investigate if cracks penetrate the building structure. 6-weeks 8 Cracks in slabs of Main Building. If cracks penetrate the structure, Building Engineer to carry out design check on beams and slabs. 6-weeks 9 Cracks in slabs of Main Building. Conduct regular inspections to monitor cracks. 6-months 10 Cracks in slabs of Main Building. If additional cracks appear or existing cracks increase in size, remove all items above the slabs and close working areas below the affected areas. Engage Building Engineer to investigate, repair and strengthen the slab. 6-months 11 Vertical bracing in the Steel Building and Fabric Warehouse is missing. The bracing should be reinstated. Reinstate bracing in Steel Building at 5th floor and 6th floor, where it has been temporarily removed. 6-weeks 12 Vertical bracing in the Steel Building and Fabric Warehouse is missing. The bracing should be reinstated. Reinstate bracing in Fabric Warehouse, where it has been temporarily disconnected. 6-weeks 27

28 Item No. Observation Recommended Action Plan Recommended Timeline 13 Localised areas of high loading on certain floor Clear notices to be placed on tanks showing limit on filling plates, including water tanks height. on 6th floor of Steel Building. 6-weeks 14 Localised areas of high loading on certain floor Tanks to be inspected daily to check that they are not being plates, including water tanks overfilled. on 6th floor of Steel Building. 6-weeks 15 Localised areas of high Building Engineer to create controlled loading plans for all loading on certain floor floors in all buildings, designating where tanks and storage plates, including water tanks can or cannot be placed, and to what height. on 6th floor of Steel Building. 6-months 16 Water build-up on slabs on Remove water build-up on 6th floor slab in Steel Building. ground floor of Main Building Provide sufficient waterproofing (e.g. membrane) to prevent and 6th floor of Steel Building water ingress into structure. 6-weeks 17 Water build-up on slabs on ground floor of Main Building Remove water build-up from ground floor and 6th floor of Steel Building 6-weeks 18 Water build-up on slabs on Inspect and maintain waterproof membrane at regular ground floor of Main Building intervals. and 6th floor of Steel Building 6-months 28

29 Item No. Observation Recommended Action Plan Recommended Timeline 19 Welded beam and column sections in Steel Building to be inspected by Building Engineer Building Engineer to inspect the quality of the constructed steel sections in the building, with particular attention to be given to the section capacity of the welded plate column sections. 6-months 20 Welded beam and column sections in Steel Building to be inspected by Building Engineer Factory to Implement any recommendations made by the Building Engineer. 6-months 21 Prior to adding additional concrete storey to Main Building, Proposed additional concrete verify concrete strength in columns by in-situ testing and floor to replace steel canopy. review with Building Engineer. 6-months 29