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    Metod Statement of Well Point De-Watering For Cement Silo

    Uploaded by

    Smart Shiva
    The document provides a method statement for a well point dewatering system for a cement silo excavation project in Lome, Togo. It outlines the proposed dewatering system using electric pumps and UPVC well points installed in a single-stage configuration connected to a header pipe network. Key steps include installing holding brackets for the steel header pipe, installing well points using high pressure water jetting, connecting the well points to the header pipe network, and discharging collected water to pits around the perimeter before draining it through hoses. Safety protocols are also described, such as using proper PPE and electrical safety measures. The system needs to be installed and operational before excavation begins below the water table.

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    Metod Statement of Well Point De-Watering For Cement Silo

    Uploaded by

    Smart Shiva
    56 views5 pages
    The document provides a method statement for a well point dewatering system for a cement silo excavation project in Lome, Togo. It outlines the proposed dewatering system using electric pumps and UPVC well points installed in a single-stage configuration connected to a header pipe network. Key steps include installing holding brackets for the steel header pipe, installing well points using high pressure water jetting, connecting the well points to the header pipe network, and discharging collected water to pits around the perimeter before draining it through hoses. Safety protocols are also described, such as using proper PPE and electrical safety measures. The system needs to be installed and operational before excavation begins below the water table.

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    Metod statement of Well point de-watering for cement silo

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    The document provides a method statement for a well point dewatering system for a cement silo excavation project in Lome, Togo. It outlines the proposed dewatering system using electric pumps and UPVC well points installed in a single-stage configuration connected to a header pipe network. Key steps include installing holding brackets for the steel header pipe, installing well points using high pressure water jetting, connecting the well points to the header pipe network, and discharging collected water to pits around the perimeter before draining it through hoses. Safety protocols are also described, such as using proper PPE and electrical safety measures. The system needs to be installed and operational before excavation begins below the water table.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    56 views5 pages

    Metod Statement of Well Point De-Watering For Cement Silo

    Uploaded by

    Smart Shiva
    The document provides a method statement for a well point dewatering system for a cement silo excavation project in Lome, Togo. It outlines the proposed dewatering system using electric pumps and UPVC well points installed in a single-stage configuration connected to a header pipe network. Key steps include installing holding brackets for the steel header pipe, installing well points using high pressure water jetting, connecting the well points to the header pipe network, and discharging collected water to pits around the perimeter before draining it through hoses. Safety protocols are also described, such as using proper PPE and electrical safety measures. The system needs to be installed and operational before excavation begins below the water table.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 5

    METHOD STATEMENT OF WELL POINT

    DEWATERING SYSTEM FOR CEMENT SILO

    AYOKI FABRICON PRIVATE LIMITED

    PROJECT NAME > 370 TPH GRINDING UNIT, LOME, TOGO

    Date of Submission -: 01.04.2020


    Introduction-: Well point dewatering is widely used for excavations of shallow depths, especially for raft
    foundations. In appropriate ground conditions a well point system can be installed speedily and made
    operational rapidly. A typical well point system consists of a series of small diameters wells (known as well
    points) connected via a header pipe, to the suction of a suitable well point pump. The pump creates a vacuum in
    the header pipe, drawing water up out of the ground. For long pipeline trenches, horizontal well points may be
    installed by special trenching machines.

    Well points are typically installed in lines or rings around the excavation, and are pumped by diesel or
    electrically powered pumps, with associated header mains, water discharge pipes, power supply generators,
    electrical controls and monitoring systems.

    Proposed Structure-: The works for the proposed development involves the excavation in Clinker silo 1 as per
    the following data.

     Area to be dewatered -: 2030.30 M2


     Maximum excavation level -: +1.470 Meter (P.C.C Bottom level)
     Existing ground level-: +5.493 Meter
     Ground water level-: +2.670 Meter
     Dewatering depth 2.670 - 1.470 mtr =1.200mtr

    (Pictures of Cement silo)


    (Pictures of De-watering pump & accessories)

    Well point system-: The well point system using materials and equipments followings are below

     1no’s De-watering electric pump is working.


     Well points -: UPVC well points.
     Header pipes-: Galvanized steel header pipe.
     Auger drilling machine (Self – propelled) – If necessary
     Jetting lance length is 4meter and it install below ground 3 meter, diameter of pipe is 0.040 (Nominal
    bore)
     300 meter long water hose pipe and diameter of pipe is 0.150meter

    Procedure-: Dewatering is defined as the removal of the ground water to a level below the normal water table,
    to enable excavation and construction to be carried out in suitable and safe condition.

    Proposed dewatering system-: It’s proposed to install a single – stage well point system to control the ground
    water within each excavation area.

    Well point dewatering involves the installation of riser pipes with a filter section on the lower portion,
    connected into a common header pipe from which the water can be pumped by a vacuum assisted pump to a
    convenient discharge point.
    Unplasticized polyvinyl chloride (UPVC) riser pipes shall be driven into the ground through the use of high
    pressure water. The jetting pump is connected to a lance through which the high pressure water is injected into
    the ground, forming a borehole into which the well point can be installed.

    WellPoint System Installation-: The system installation followings are below

     Holding brackets for steel header pipe-: Holding brackets must be used to install steel header pipe from
    0.5m above the existing water table.
     Wellpoint installation-: It will be installed into the boreholes as per requirement wise. High pressure
    Once the well point is installed the lance is held in this position until the water being ejected out through
    the top of the boreholes runs clean.
     Header pipe network-: Upon completion of the installation of the pre-de-termined number of well
    points, the well points shall be connected to the header pipe network by means of swing pipes, which
    turn is connected to the dewatering pump.

    Drain system& Discharge-: The collected water is discharge in pit around the perimeter of the excavation site
    within the soil layers. After that the water will be collected from drain and discharge through hose pipe into the
    plant or market drain.

    (Due to emergency or any trouble purpose we can change the water discharge point after getting site checking fromCimco SA & Intercem)
    Safety-:Work will be carried out in accordance with action safety documentation. Should wear proper PPE’S,
    Continues supervision from competent person those who are involved in the dewatering activities .Persons
    competency should be ensure previous to start the work .Equipments safety (avoid spillages) dewatering
    machine handling, machine guard system, electrical safety.

    Electrical safety: Electrical power drop from adequate panel through ELCB/MCCB, adequate Power cables will be
    use for the installation, cables should be dragging by designed and protected unauthorized entry, handling and
    vehicle movements. Panel earthing ensure and protected, dewatering pump earthing (if it is Electrical), fire
    extinguisher should be install.

    Program-: The dewatering installation shall be dependent on the site access and working space available. The
    dewatering system needs to be installed and operational before the excavation below the water table begins.
    After the method statement has been approved, the instruction from CIMCO – SA to begin mobilization should
    be given. Works will be carried out in accordance with the attached program not take account of any delays due
    to authority approvals for the structural works.

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