Earth Work Method Statement


30 Apr.2019

Earth Work Method Statement




TABLE OF CONTENTS


1.     General Description

2.     Organization of the execution
3.     Machines to be used
4.     Work procedure
4.1  Preparation
4.2  Setting out
4.3  Retaining wall
4.4  Excavation, dewatering, leveling and soil disposal
4.5  Gravel and lean concrete
4.6  Backfill and damp-proof sheet
4.7  Anti-termite treatment
5.     Quality control
6.     Safety measures



4.    Work procedure
Actual earth work shall be executed as per the following detailed work sequence.
1. Preparation
2. Setting out
3. Retaining wall
4. Excavation, dewatering, leveling and soil disposal
5. Gravel and lean concrete
6.Backfill and damp-proof sheet
7.Anti-termite treatment
Each detailed work is described below.

4.1  Preparation
a)     Excavation plan drawings shall be approved by the Employer before starting the work.
b)     Confirm that the area to be excavated is free from all the obstacles including underground service facilities.
c)      Investigate the surrounding buildings or structures and record the current status of them.

4.2  Setting out



a)     Offset stakes shall be put at the both ends of the grid lines.
b)     Excavation lines shall be marked by lime powder in accordance with the excavation plan.

4.3  Retaining wall



a)     The temporary retaining wall shall be provided where the safe angle of the excavation slope cannot be obtained in the excavation area deeper than 1.5m. The location of the temporary retaining walls shall be indicated in the excavation plan.
b)     The structure of the retaining wall shall be given in the excavation plan.
c)      The structural soundness of the retaining walls shall be calculated in accordance with the relevant regulations.

4.4  Excavation, dewatering, leveling and soil disposal



a)     Excavation slope angle shall not steeper than 60 degrees from the horizontal plane in the area deeper than 1.5m.
b)     In case of heavy rain is expected, excavated slope shall be protected with covering sheet.
c)      Dewatering system shall be indicated in the excavation plan.
d)     Final leveling shall be made manually surveying with a level.
e)     Excavated soil shall be taken from the site because there is little room for stock in the site. Disposal site shall be approved by the relevant authorities.

4.5  Gravel and lean concrete




a)     The gravel shall be provided under the lean concrete. The gravel shall be crusher run 40-0 and the thickness is 50mm.
b)     The gravel shall be compacted with a compaction plate of 90 kg.
c)      The lean concrete shall be provided under the pile caps and the ground beams. No lean concrete shall be provided under the slab on grade.
d)     The lean concrete shall have the 28day strength of 15 MPa. However, no strength test shall be implemented because the lean concrete has no structural meaning. Instead dispatch note of the concrete plant shall be kept as an evidence of the usage.
e)     The thickness of the lean concrete shall be 50mm. The edge of the lean concrete shall be 50mm from the surface of the concrete structure. Top of the lean concrete shall be leveled smooth by wooden trowels.

4.6  Backfill and damp-proof sheet



a)     Material for the backfill shall be selected from the excavated material which is free from injurious matter. Backfilling materials shall be deposited in layers not exceeding 250mm in uncompacted thickness. Each layer shall be well compacted before depositing the following layers.
b)     The damp proof sheet shall be polyethene sheet of 0.15mm in thickness and shall be laid under the concrete slab on grade touching directly to the soil.



4.7 Anti-termite treatment
     Anti-termite treatment shall be executed to the soil inside the building area and 3m extent from the edge of the building. It shall be executed by a licensed specialist and shall be guaranteed for ten years by the Contractor.

4.8    Quality control
a)     The Contractor shall prepare a self -inspection sheet for the earth work and inspect the works according to the sheet at the end of each procedure of the works.
b)     After successfully passing the above self-inspection, the Sub-contractor is entitled to proceed to the next procedure.
c)      Pictures showing the right procedure of the works shall be taken and filed in the work record.  

4.9    Safety measures
a)     The gate keepers shall guide the trucks coming in or going out of the site in order to prevent any accidents with the third persons.



b)     Tires of the trucks shall be washed to prevent any mud to be taken to the public road.
c)      Before starting each day’s work, a safety meeting shall be held by all the persons on the site to recognize the actual work to be executed and foresee the danger related to the work.



d)     Construction machines shall be checked every day before starting the work. The record of the checking shall be filed in the work record.
e)      Safety handrails shall be installed at the edge of the excavation of which depth exceeds  1.5m.

The End

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# Author by: Mr. Sirey Bunhuot
# Tell : 078 474759
# Email : bunhuotf@gmail.com
# Wedsite : brofy-es.bolgspot.com
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