Demolition

Published:

Demolition

1 Description

2 Findings

2.1 Submission

Refer to require of Building and Construction Authority (BCA) and/or Urban Redevelopment Authority (URA), the Professional Engineer (PE) prepared and submitted a copy of key plan to show the site location ( ?, page ?), photographs of building to be demolish with surrounding building ( 2 and 3, Appendix A, page ?) and the method statement for demolition which should in accordance with the current Code of Practice on Demolition - Singapore Standard CP 11. Afterwards, the Contractor provided the following report: Risk Assessment Report, Impact Assessment Report, Pre-construction Survey Report, Protective Hoarding and Full-height Netting, Vibration Monitoring of Plan and Disposal of demolition Debris. (Appendix A)

2.2 SAFETY

2.2.1 Site safety supervisor

The company employed a site safety supervisor who obtains the certification in construction safety on full-time basis throughout the duration of site works. Site safety supervisor shall in charge the site. (Appendix B)

2.2.2 Type of Hoarding (Appendix B)

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The contractor used category D hoarding to withstand all imposed loads due to wind, crowds and impact, where applicable, and to provide to pedestrians.

2.3 Existing Utilities Supply

2.3.1 Double check that the existing water and gas supplies if any, had been terminated

2.3.2 Ensure that existing power supply has been de-energized

2.3.3 Seal off the inlets of the nearest IC or manhole.

2.3.4 Divert and reinstate the residual permanent drainage system.

2.4 Demolition Equipment

SK200 mounted with pneumatic breaker for general breaking at ground level

Excavator ‘907' mounted with pneumatic crusher for crushing works at ground level

Excavator ‘904' with bucket for clearing of debris at ground level

Hand held compressor breaker for breaking works at 2nd strorey

2.5 Sequence of Demolition

All demolition works must be carried on according with the current Code of Practice on Demolition - i.e. Singapore Standard CP11:2002

2.5.1 Manual demolish of existing roof tiles and structure

2.5.2 Manual hacking of internal NON load bearing partitions from roof level to 1st level.

2.5.3 Demolish load bearing elements by breaker from 2nd storey to 1st storey.

2.5.4 To clean out all unwanted debris.

2.5.5 Demolition of ground slabs and grab footing/pile caps

2.5.6 to clean debris and make backfill.

2.6 TREATING THE SLAB AND BEAM REBAR

Slab Rebar:

1) To cut neighbor house slab rebar with a protruded length of 50 millimeter.

2) To bend the rebars and to patch up the area with high strength non shrink grout

Beam Rebar:

1) To cut neighbor house rebar with protruded length of 25 millimeter.

2) To inser a steel plate of 6 millimeter thick with holes for insertion of the above cut rebars

3) To weld the above rebars to the plate

4) To patch up the plate with high strength non shirnk grout.

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2.7 Environment

Take all reasonable precautions to prevent pollution of the site and the general environment including streams and waterways. If pollution occurs, inform the appropriate authorities and the SO immediately and provide them with all relevant information.

2.7.1 Air pollution

Take all necessary measures to abate the discharge of smoke, fumes or obnoxious gases from any construction equipment,

Stop using construction equipment discharging excessive smoke, fumes or obnoxious gases and replace it with the accepted equipment.

Comply with the relevant provisions of the environmental pollution control (air impurities) regulations and/or any requirement of other relevant authorities.

2.7.2 Dust Control

Take all necessary measures to control the dust such as periodically spraying demolition works with water.

For buildings exceeding 6 storeys, erect fine netting adequately supported to a minimum height of 6m above the hoarding for further dust control.

2.7.3 Noise Nuisance

Take all necessary actions to ensure compliance with the Environment Public Health Act, under Section 46 or the latest noise control regulations imposed by the NEA or any relevant authorities.

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The noise level at the nearest occupied building outside the Site shall not exceed the following maximum permissible noise level, or shall have met the noise control guidelines introduced by NEA whichever is the more stringent:

Type of occupied buildings

Applicable period

Maximum allowable equivalent continuous noise level measured over a period of 5 minutes in dB.

(a) Hospital, school, home for the aged, sick etc

7am to 7pm

75

7pm to 7am

55

(b) Buildings other than those in (a) above

7am to 7pm

90

7pm to 7am

70

2.7.4 Rubbish

Take all reasonable steps to minimize waste production on site

Dispose rubbish and unwanted non-hazardous materials at NEA approved tips and keep the site clean and tidy.

Remove all rubbish, dirt and residues from voids and cavities before filling or closing in.

Sort and dispose of recyclable material at an NEA approved Material Recycling Facility where applicable.

Retain waste transfer documentation on site.

Appendix A

1. Risk Assessment Report

QP shall in charge for this report which identification risk involved in demolition, proposed measures to mitigate the risk, and effect on surrounding properties such as possible danger to public.

This report shall include the detail of design and check on the structural stability & integrity of remaining adjacent property which shall be done by QP.

2. Impact Assessment Report

Contractor has to complete checklist to contain recommendation measure for prevent any settlement or movement which will cause damage.

3. Pre-construction Survey Report

The builder has to survey before demolish and the result has to give adjacent owners for notice.

4. Protective Hoarding and Full-height Netting

5. Vibration Monitoring of Plan

QP shall submit the latest vibration monitoring of plan and to ensure the vibration generated within given level in DIN standard i.e. not more than 3mm/s.

6. Disposal of demolition Debris

Builder shall provide method on the proper disposal all debris.

Appendix B

Description for Safety

All sites shall not permit any person to do anything not according to the generally accepted principles of safe and sound practice.

Ensure a safe environment on the Site at all times. Maintain all safety provision properly and do not remove any specific equipment etc without the written acceptance of the Safety Office (SO).

Ensure that all personnel take necessary and sufficient safety precautions such as the helmet and boots.

Site safety supervisor should in charge the following duty:

i. To supervise safety and promote safety conduct

ii. To inspect and rectify any unsafe place of work

iii. To correct any unsafe practice

iv. To ensure that the provisions of the Factory Act and its subsidiary legislations are complied with.

Description for Hoarding

v. Erect protective hoarding, safety netting/catch platform or other structures to ensure public safety prior to starting demolition works.

vi. Provide, erect and maintain a continuous hoarding around the entire contract boundary prior to commencement of the works.

vii. Erect the hoarding at not less than 300mm away from any permanent structure such as footway, drain, pipeline, etc. unless otherwise agreed.

Type of hoarding

The types of hoarding depend on the building locality and the demolition zone. In addition, the categories of hoarding shall be as follows:

i. Category A: Protective hoarding for use where footway is needed;

ii. Category B: Protective hoarding for use where footway is not needed;

iii. Category C: Protective hoarding erected on carriageway;

iv. Category D: Scaffold hoarding shall be minimum 6.8metres high where the distance between the building edge and the hoarding is less than 11/2 times the height of the building;

v. Category E: Metal hoarding shall be minimum 2metres high where the distance between the building edge and the hoarding is more than 11/2 times the height of the building.

Appendix C

Briefing of Demolition

2.5.1 All demolition works must be carried on according with the current Code of Practice on Demolition - i.e. Singapore Standard CP11:2002

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2.5.2 All demolition works has to keep the least disturbances to the adjoining/neighboring structure and according strictly the top-most members down to bottom-most members' method.

2.5.3 During hacking sizable debris and/or rubbish must be lowered to the ground level by mechanical hoist. However, smaller debris and /or rubbish will be allowed to fall vertically to the ground.

2.5.4 No workers will be allowed at the surrounding ground floor areas during hacking. Hacking operation will be stopped on a regular basis to allow workers to collect the debris and/or rubbish.

2.5.5 Debris and/or rubbish shall be mixed with little water and kept moist at all times to prevent dust nuisance and the wet debris and/or rubbish must be disposed off site to approved dumping area. Noise and vibration level will be monitored by expert if necessary.

2.5.6 Walls and partitions cannot stand by themselves for more than 1 storey high. In addition, wall hacking shall be started from the top of the wall and proceed downwards.

2.5.7 Retain the lap length at least 45 times the diameter of the bars if those reinforcement bars inside the continuous beams which from neighboring structures. In addition, the exposed bars have to be treated with anti rusting agent immediately.

Appendix

Standards

Unless otherwise agreed by the SO, ensure all of the works comply with the relevant requirements of the Standards and Codes listed below or referenced in the body of the Specification, Alternative Standards and Codes may be proposed for approval by the SO, provided it can be demonstrated that the alternative Standards and Codes comply with the requirements of the standards specified. All Standards and Codes quoted are the current version, unless specific year references are noted.

In the event that the Standards or Codes are partially superseded or become obsolete, refer to the latest edition or the approved substitution for the relevant clauses.

SS CP 11 Demolition

BS 6187 Code of Practice for Demolition

BS5228: Part 1 Noise and vibration control on construction and open sites - Code of practice for basic information and procedures for noise and vibration control.

BS 5395: Part 1 Stairs, ladders and walkways - Code of practice for the design construction and maintenance of straight stairs and winders

BS 5607 Code of practice for safe use of explosives in the construction industry

BS 5973 Code of practice for access and working scaffolds and special scaffold structures in steel

BS 5974 Temporary installed suspended scaffolds and access equipment (partially superseded by BS EN 1808)

BS 5975 Code of practice for false work

BS EN 1808 Safety requirements on suspended access equipment - design caculations, stability criteria, construction - tests Statutory Regulations and Guidelines

Unless otherwise specified, the works shall comply with the relevant sections of the following statutory requirements:

a. Factories Act (Building Operations and Works of Engineering Construction - BOWEC) Regulations, MOM

b. Guidelines on Handing Asbestos Materials, MOM

c. Code of Practice for Handling of Asbestos Materials, MOM

d. Factories (Asbestos) Regulations, MOM

e. Factories (Asbestos) (Amendment) Regulations, MOM

f. Factories (Medical Examinations) Regulations, MOM

g. Building Control Regulations (BCR)

h. Environmental Pollution Control (Air Impurities) Regulations (NEA)

i. Environment Public Health Act (NEA)

j. Code of Practice for Railway Protection (LTA)

k. Guide to Carrying Out Restricted Activities within Railway Protection and Safety Zones (LTA)