Box type Water proofing

Background :

During previous post , we considered the various elements to be constructed for an elevator or lift.

We also saw that in the Lift pit , we need to do the box type of water proofing.

{ Refer the post :PROVISION FOR ELEVATOR }

The water proofing is also needed for the basement portion.

basic purpose is quite obvious. To prevent the basement from getting flooded by water.

This might happen during the rainy season or in case if the  water level is already at a higher level , then this might be a perennial issue.

This article explains the basic steps to be taken during the box type of water proofing .

A series of photographs right from mass excavation up to the base raft have been demonstrated for clarity of the steps.

IMAG3986
YOU SHALL WONDER TO THIS SCENARIO. THIS IS A MASS EXCAVATION DONE FOR THE BASEMENT OF A BUILDING. THE MASS EXCAVATION WAS COMPLETED FAST WITHOUT PROPER PLANNING.AS A RESULT , YOU CAN SEE THAT THIS PIT IS FLOODED WITH RAIN SURFACE WATER . IN MY OPINION , THE EXCAVATION SHOULD BE TAKEN UP ONLY WHEN THE BASIC INFRASTRUCTURE SUCH AS CEMENT GODOWN , APPROACH AND MATERIALS ARE AVAILABLE AT SITE .
IMG02772-20130107-1219
DE-WATERING HAS BEEN COMPLETED FOR THE ENTIRE PIT.IT HAS BECOME DRY NOW.THE EXCAVATION BOTTOM HAS BEEN DRESSED TO RECEIVE FURTHER TREATMENT.
17122010013
RUBBLE SOLING HAS COMPLETED . THIS IS NECESSARY ESPECIALLY IF THERE IS A LARGE LEVEL DIFFERENCE AT THE PIT BOTTOM. THIS IS AN ECONOMICAL AND STRUCTURALLY BETTER SOLUTION TO SPENDING ON PLAIN CEMENT CONCRETE. FILLING MURRUM IS ALSO A GOOD OPTION BUT IT TAKES MORE TIME TO COMPACT AND CONSOLIDATE THE MURRUM IN LAYERS.
20122010040
PLAIN CEMENT CONCRETE IN MIX M10 HAS BEEN COMPLETED OVER THE RUBBLE SOLING.
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FLAG STONES ( 15 TO 20 MM THICK ) ARE LAID OVER THE PCC. FLAG STONE IS A NATURAL STONE ( SEDIMENTARY/METAMORPHIC ) AND IS RESISTANT TO WATER SEEPAGE. YOU CAN SEEN THAT AN OPEN JOINT OF 15 TO 20MM IS KEPT IN BETWEEN THE STONES. THIS IS FOR ENSURING THAT A WATERTIGHT JOINT CAN BE PREPARED BETWEEN THE STONES.
20150304_104633
THIS IS THE BASE PORTION OF THE RAFT WHICH CORRESPONDS TO THE ELEVATOR AREA. YOU CAN SEE A CENTRAL PIT WHICH IS EQUAL TO THE LIFT SHAFT/DUCT. THE REINF. ARE FOR THE LIFT RCC WALL .
20150310_125424
HERE YOU CAN SEE THE FOLLOWING : 1. WATER PROOF CEMENT PLASTER FINISHING HAS BEEN COMPLETED OVER THE PCC. 2.THE BASE RAFT REINFORCEMENT HAS BEEN LAID IN POSITION 3.BOX FOOTINGS & COLUMN REINFORCEMENT ALSO HAS BEEN PLACED IN POSITION.
20150310_085750
THIS IS A PANORAMIC VIEW OF THE BASEMENT . THE BASE RAFT IS NOW READY FOR CASTING. IN THIS PIC YOU CAN ALSO SEE THE PERIPHERAL RCC WALL FOR THE BASEMENT.
IMG_20150304_095619
THIS PHOTOGRAPH SHOWS THE POSITION AFTER THE BASE RAFT HAS BEEN CAST.
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