Page 17 - Building Regulation and Design Guidelines - Structural (Grey Code)
P. 17

SECTION: 1
   SECTION: 1
   SECTION: 1  GEOTECHNICAL GUIDELINES & REGULATIONS                                    SECTION: 1   GEOTECHNICAL GUIDELINES & REGULATIONS
               GEOTECHNICAL GUIDELINES & REGULATIONS
                                                                                                     GEOTECHNICAL GUIDELINES & REGULATIONS

                                                                                                                                             DEWATERING WELL
                                                                                                          To Main Line  Installation level
                                                                                                                                                     Flowmeter
                                                                                                                                                      Internal tube for
                                                                                                                                           Platform
                                                                                                                      Well caslng( 400-450mm Dla)
                         RAFT      Water Prooling                RAFT                                                                                 External tube for
                                 membrane
                                                                                                                      Bored hole(800-1000mm)  Smooth
                                                                                                                                          Steel Tube
                                             1600mm
                                                                                                                      Discharge from pump
                                                                  R.c.c                                                                   Smooth Tube  Tube of
                                             pipe entry form                                                                               Repression   Calibrate Filtration Gravel
                                             deep well open  600mm                                            Depth   Filter material(3/8 Aggregate)
                                         Filing
                                                                  block work
                                                 400mm
                                                                                                                                                      Internal tube for
                            P.C.C
                                                                                                                                          Perforated
                                                                  100mm                                                                   Steel Tube  External tube for
                                                           200mm 80mm                                                 Submersible pump
                                         TYPICAL WELL PIT                                                                                  Excavation  Excavation
                                       (Dewatering runing, well pit open)                                     800-800mm                   PERFORMED TUBE
                                                                                                                                        W.T.             W.T.
                                                                                                           TYPICAL CROSS SECTION OF                   External Tube
                                                                                                               DEEP WELL                              Well Toe & Tube
                             Fig. (1.13): Well Pit Details (Running / Finished)                                                                      Stopper
                                                                                                                     Fig. (1.14): Details of Dewatering Deep Well

                                                                                                                         TO MAIN LINE  Installation level
                                                                                                                                           Initial Water Table level
                           Raft                                   Raft
                   Genaral P.c.c               1600mm

                                                                   R.c.c
                                              Deep Well Closed
                                                         600mm                                                               H
                                         Fitting                                                                                           Final excavation level
                                                                   Block Work
                                                                                                                                          Final Water Table Level after drawdown
                                                                                                                                              Drawdown curve
                             P.c.c
                                                                   100MM                                                   h
                                                                 80MM                                                                      Level of water retalned in the well
                                                            200MM
                                                                                                                                         hw
                                            WELL PIT DETAILS
                                                                                                                     Fig. (1.14): Details of Dewatering Deep Well
                                 Fig. (1.13): Well Pit Details (Closed)


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