Dew Fashions Ltd. Le-Nouveautex Ltd. House-65,Board Bazar, Gazipur, Dhaka ( N, E) 22 June 2014

Transcription

1 1 Dew Fashions Ltd. Le-Nouveautex Ltd. House-65,Board Bazar, Gazipur, Dhaka ( N, E) 22 June 2014

2 2 Observations

3 Main Factory Building - Columns appear to be stressed to levels that require immediate action & review 3

4 IMMEDIATE EVACUATION Main Factory Building Main Factory Building to be evacuated with immediate effect. Columns are highly stressed. 4 Column Strength

5 Cursory calculations indicate that columns are working at high stress levels requiring immediate action. North Brick aggregate was observed in the ground floor columns 5 Ground floor column layout Column Strength

6 Dyeing Shed - Wall and roof bracing sagging significantly. 6

7 Loose cables Roof plan bracing Side bracing Steel cable was used in the Dyeing Shed to provide longitudinal stability. However these cables were observed to be loose therefore providing no resistance to lateral movement of the frame. These cables should be stressed appropriately as instructed by Building Engineer 7 Dyeing Shed - Bracing

8 8 Apparently non-engineered steel structures

9 Some elements of the roof to main factory building appear to be non-engineered Building Engineer to carry out a structural assessment Intermediate truss support to be reviewed Roof to main factory building. Structural assessment to review; Overall roof design including support of trusses on RC columns and between columns where trusses appear to be supported on light steelwork. Overall lateral stability Connection/bearing details Some section sizes appear to be slender Building Engineer to review stability of these structures and propose strengthening works, if required. 9 Non-engineered structures Lightweight steel roof to main factory

10 Building Engineer to carry out a review of the structural adequacy of lightweight steel structures. Utility building stair Canopy structure adjacent to factory building 10 Non-engineered structures

11 Props to cantilevers in ETP structure not documented 11

12 North Two concrete columns were observed in the areas shown above. These columns prop the underside of cantilever beams. Along this gridline, there are four cantilever beams, but only the centre two are propped. Building Engineer to review the props and check capacity of cantilever area for proposed additional floors. 12 ETP Props to Cantilever

13 Absence of structural information and inconsistencies noted between drawings and as built construction 13

14 Toilet block on 5 th, 4 th, 3 rd & 2 nd floors North Metal deck floor on steel construction 1 st floor only The only structural documentation was one set of drawings dated The original construction drawings were not available. As part of the Detail Engineering Assessment a full set of as built drawings is to be produced for the main factory building. Undocumented concrete columns were observed in the ETP building, see previous observation. Stairwell to 1 st floor only 14 Toilet block on 1st floor Drawing Inconsistencies

15 15 Areas not surveyed

16 Ceiling tiles covering soffit of slabs at underside of 4 th, 5 th and 6 th floors. Water tanks & mast at roof level Areas of the slab soffit were not visible due to ceiling tiles on the underside of 4 th, 5 th and 6 th floors. No access was gained to the roof over the south eastern stairwell which supports the water tanks. A communication tower was also located over this area. 16 As part of the Detail Engineering Assessment for the main factory building, slab soffits are to be inspected and full inspection of water tank area is to be carried out including a check of communication tower anchor detail/capacity. Areas not surveyed

17 17 Priority Actions

18 Problems Observed ITEM 1: Main Factory Building - Columns appear to be stressed to levels that require immediate action and review ITEM 2: Dyeing Shed - Wall and roof bracing sagging significantly ITEM 3: Apparently non-engineered steel structures ITEM 4: Props to cantilevers in ETP structure not documented ITEM 5: Absence of structural information and inconsistencies noted between drawings and as built construction ITEM 6: Areas not surveyed 18

19 Item No. Observation Recommended Action Plan Recommended Timeline Main Factory Building - Columns appear to be Immediately evacuate the entire building stressed to levels that require immediate action and review Main Factory Building - Factory Engineer to review design, loads and column Columns appear to be stresses. Verify insitu concrete strengths (using min. 4 no. stressed to levels that require 100mm dia. cores) and existing reinforcement for all immediate action and review columns. Main Factory Building - Columns appear to be A Detail Engineering Assessment of Factory to be stressed to levels that require commenced, see attached Scope immediate action and review Main Factory Building - Produce and actively manage a loading plan for all floor Columns appear to be plates within the factory giving consideration to floor stressed to levels that require capacity and column capacity. This should establish a safe immediate action and review imposed load for each floor. Main Factory Building - Columns appear to be Detail Engineering Assessment to be completed. stressed to levels that require immediate action and review Main Factory Building - Columns appear to be Strengthen building as appropriate stressed to levels that require immediate action and review Main Factory Building - Columns appear to be Continue to implement load management plan stressed to levels that require immediate action and review Immediate - Now Immediate - Now Immediate - Now 6-weeks 6-weeks 6-months 6-months 19

20 Detail Engineering Assessment This Schedule develops a minimum level of information, Analysis and testing expected as part of a Detail Engineering Assessment. The Building(s) have been visually assessed and it is deemed necessary that a detailed engineering assessment be carried out by a competent Engineering Team employed by the factory Owner. This Request should be read in conjunction with the BUET developed Tripartite Guideline document for Assessment of Structural Integrity of Existing RMG Factory Buildings in Bangladesh (Tripartite Document), the latest version of this document should be referenced. T his document also gives guidance on required competency of Engineering Team. We expect that the following will be carried out: 1. Development of Full Engineering As-Built Drawings showing Structure, loading, elements, dimensions, levels, foundations and framing on Plan, Section and Elevational drawings. 2. The Engineering team are to carry out supporting calculations with a model based design check to assess the safety and serviceability of the building against loading as set out in BNBC-2006, Lower rate provisions can be applied in accordance with the Tripartite Guidelines following international engineering practice, justification for these lower rate provisions must be made. 3. A geotechnical Report describing ground conditions and commenting on foundation systems used/proposed. 4. A report on Engineering tests carried out to justify material strengths and reinforcement content in all key elements studied. 5. Detailed load plans shall be prepared for each level showing current and potential future loading with all key equipment items shown with associated loads. 6. The Engineering team will prepare an assessment report that covers the following: As-Built drawings including Plans at each level calling up and dimensioning all structural components Cross sectional drawings showing structural beams, slabs, floor to floor heights, roof build-ups and Basic design information of the structure Highlight any variation between As-built compared to the designed structure Results of testing for strength and materials Results of geotechnical assessment and testing/investigation Details of loading, inputs and results of computer modelling Commentary on adequacy/inadequacy of elements of the structure Schedule of any required retrofitting required for safety or performance of Structure Any proposals for Retrofitting to follow guidance developed in the Tripartite Document 20

21 Item No. Observation Recommended Action Plan Recommended Timeline 8 Dyeing Shed - Wall and roof bracing sagging significantly Bracing cables should be stressed appropriately as instructed by Building Engineer 6-weeks 9 Apparently non-engineered steel structures Building engineer to check the capacity of non-engineered structures under horizontal and vertical loading including all connections and make any necessary alterations required. 6-weeks 10 Props to cantilevers in ETP structure not documented Building Engineer to identify purpose of props, by reference to the original structural design, and check capacity of cantilever area for proposed additional floors. 6-months 11 Absence of structural information and inconsistencies noted between drawings and as built construction Building engineer to prepare a set of as built drawings for all structures linked to the factory s activities. (Refer to Item 1 Detail Engineering Assessment) 6-weeks 12 Absence of structural information and inconsistencies noted between drawings and as built construction Ensure all documentation reflecting as built construction is produced. 6-months 13 Areas not surveyed As part of Item 1 Detail Engineering Assessment, ensure all areas of the building are inspected including the water tanks, soffit of floor slabs (where ceilings are present) and roof mounted communications mast. 6-weeks 21