Method statement for structure excavation
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This document provides a method statement for excavation work for the Dasherkandi Sewage Treatment Plant project. It outlines the organization responsibilities, resources, excavation methods, safety measures, and quality plan. The excavation work will be done using excavators, wheel loaders, and trucks. Proper surveying and setting out will be conducted before excavation. Excavated material will be temporarily stored and later used for backfilling. Safety measures like guard rails and toolbox talks will be implemented. Quality control will conform to the project's approved quality plan.
Method statement for structure excavation
- 1. Page 1 of 9 DASHERKANDI SEWAGE TREATMENT PLANT PROJECT Employer: Dhaka Water Supply ＆ Sewerage Authority DSTP-HCC-MS-02 Method Statement for Excavation Work THE EMPLOYER: DHAKA WASA THE CONSULTANTS: HANKUK ENGINEERING CONSULTANTS THE CONTRACTOR: HYDROCHINA
- 2. Page 2 of 9 Rev. No. Date Amendment Record Prepared By Approved By 0 22/04/2018 First Version Provided by HydroChina Nabin 1 27/05/2018 Second Version Provided by HydroChina Nabin 2 10/06/2018 Third Version Provided by HydroChina Nabin
- 3. Page 3 of 9 Table of Content 1. Purpose and Scope ....................................................4 2. Reference Document ..................................................4 3. Organization Responsibility.......................................4 4. Resource .....................................................................5 4.1 Main construction equipment ...................................................5 4.2 Manpower..................................................................................5 4.3 Soil and improved sub-grade testing equipments...................6 5. Excavation Method .....................................................6 5.1 Process of Excavation work...................................................... 6 5.2 Survey and setting out.............................................................. 7 5.3 Excavation work........................................................................7 5.4 Filling for foundation..................................................................8 6. Health and Safety ........................................................8 7. Quality Plan .................................................................9
- 4. Page 4 of 9 1. Purpose & Scope This plan provided for structure of DSTP excavation and associated work to ensure compliance with contract specification and BNBC 2006. The plant is located in low lying area and sand filling work to an average elevation is already completed. As the construction drawing, all of the excavation and backfilling work of the structure of DSTP will be on the filling sand layer. This procedure provides a standardized framework for the control of excavation, earthwork, storage and filling of filling sand for foundation treatment. 2. Reference Document 1) Volume 2 & 4: technical proposal & technical specification. 2) Bangladesh National Building Code 2006. 3. OrganizationResponsibility The organization of site includes Construction Manager, Site Manager, Site Engineer and Site Safety Officer for the structure excavation and associated work. Construction Manager gives instructions to Site Manager to ensure that all safety requirements are comply all the times. Site Manager Reports to the Construction Manager will be in-charge of the construction. He will coordinate all concerned parties and ensure site works are completing in time and with proper quality. Site Engineer reports to the Site Manager will be in charge of the construction quality. In order to contact with them on site instantly, the detailed information about them will be provided as follow.
- 5. Page 5 of 9 Site Safety Officer who create and maintain safe working conditions in all operations. Table 3.1: Organization chart for excavation work S/ N Name Position Mobile 1 Liu Aihua Construction Manager 01829879756 2 Qiu Dong Site Manager 01774177589 3 Liu Zhi Site Engineer 01783775739 4 Chen Song Site Safety officer 01701394908 4. Resource 4.1Main Construction Equipment Main equipment’s utilized in this work are as following. Table 4.1: Equipment’s list for excavation work NO. Description Quantity Remarks 1 Excavator 2 2 Plate Compactor 1 3 Wheel loader 2 4 Heavy truck 4 5 Small truck 1 4.2Manpower The estimated manpower is tabulated as follow, which will be subject to revision based on actual requirements during implementation. Table 4.2: Manpower list for excavation work S/N Description Number Required Remarks 1 Construction Manager 1 2 Site Manager 1 3 Site Engineer 1
- 6. Page 6 of 9 4 Excavator operator 2 5 Wheel loader operator 2 6 Truck operator 5 7 Site Safety Officer 1 8 Compactor operator 1 9 Technician of survey 1 10 Repairman 2 11 Electrician 2 12 labor 10 4.3 Soil and Improved Sub-grade testing 1. Digital moisture measuring meter 2. One set of standard proctor test equipment (mould,hammer,cans etc.) 3. One set field density measuring device (measuring jar, sand etc.) 4. One no. electric oven (250’c, 720 litre) 5. One no. electric oven (250’C, 720 litre) 5 Excavation Method 5.1 Process of Excavation work and backfilling Survey and setting out Excavation Structure construction Backfilling Figure-5.1 Excavation process
- 7. Page 7 of 9 5.2 Survey and Setting Out Prior to commencement work, a level survey will be carried out to confirm the information included on the contract drawing and to provide an accurate record of the existing ground levels (E.G.L) for the calculation of quantities. Before the trench excavation, the alignment of structure shall be surveyed and set out accurately and submit the report to the consultant and approved by them. 5.3 Excavation Work 1) Excavator will be used for excavation and dump trucks will be used to transport the excavated material to the suitable place for temporary storage. The excavated material will be backfilled after the structure work completed. 2) The excavation will be done according to the location of survey and setting out, professional construction personnel will be arranged to in charge of the work. 3) The excavation will be done in which method that the excavate level shall be controlled time to time to avoid over excavate happened. 4) After reaching the designed formation level, consultant’s representative shall be requested in writing to inspect and approve the formation prior to the commencement of any subsequent activities. 5) If water is encountered, dewatering measures, such ditches drainage should be applied. Dewatering should be conducted carefully when it is in the vicinity of the buildings or structures so as to avoid the damage of buildings or structures. Great care shall be taken to minimize noise, vibration and dust pollution, which can cause nuisance and damage. 6) For slop protection of the foundation excavation suitable method will be adopt to prevent slope instability. a) For most of the structures in DSTP which have enough space, slop excavation method will be adopted and the slop will be control. b) The inlet pump station of DSTP will use steel sheet pile for foundation protection due to its excavation depth is very deep.
- 8. Page 8 of 9 c) Some other structure or pipeline at site can’t use the method of open excavation the sheet pile may be used as required of the site condition. 5.4 Filling for Foundation 1) Before placement of the fill, the existing ground surface shall be stripped of all organic growth, timber, rubbish and debris. After stripping, the ground surface shall be compacted. 2) Filling should be done from both sides of pipe line in such a way that, the pipes may not shove away. Include the filling material quality around the pipe for 0.5 m. 3) Excavated foundations will be back-filled with excavated material and the material is filling sand. Roller (15t) will be used as required to compact the excavated material which will be compacted layer by layer as require depth. Watering the backfilled sand as required after filling work completed for self- compaction. 6 Safety and Health Every excavation shall be provided with safe means of ingress and exit kept available at all times. 1) Safety equipment as necessary 2) Safety induction for New Employees 3) Inspection of Machinery everyday 4) Safety tool box talks to be convened and attended by all personnel to do the work prior to starting which will be given instruction the hazards and safe systems of work. 5) Strictly following the approved HSE plan is necessary. 6) Guard rail of 1m height should be provided.
- 9. Page 9 of 9 7 Quality Plan HydroChina intends to implement its quality control in accordance with the approved Quality Plan of the project. The quality of our activities will be set to conform to our commitment to provide a level of service and operational standard that complies with Project technical specification.