PART VII - DRAINAGE STRUCTURES

IT IS MEANT TO STABILIZE THE FOUNDATION BED TO AVOID ANY POSSIBLE SETTLEMENT THAT MIGHT IMPAIR THE FUNCTION OF THE DRAINAGE STRUCTURE AND ALSO TO SERVE AS A UNIFORM CUSHION TO THE CULVERT

IF THE UNDERLYING SOIL AT THE DESIGNED BOTTOM GRADE OF THE CULVERT IS COMPOSED OF SUITABLE MATERIAL, IT SHOULD BE REMOVED REMOVED AND SUBSTITUTED WITH GRANULAR FILL COMPOSED OF SAND OR SANDY SOIL.

• TRUE

• FALSE

NORMAL THICKNESS OF FOUNDATION FILL

• 20 cm

• 25 cm

• 22 cm

• 20 mm

WHAT CAN BE USED TO SPREAD MANUALLY THE FOUNDATION FILL UNTIL THE WHOLE FOUNDATION BED IS COVERED, AS REQUIRED? (SELECT AS MANY)

• RAKES

• SHOVEL

• COMPACTOR

• SCRAPERS

FOR _ CULVERTS, THE LAYERS ARE OF UNIFORM FLAT THICKNESS.

• BOX

• PIPE

• CIRCULAR

______ ARE INSTALLED IN THE ORIGINAL STREAMBED WITH THEIR GRADES AND FLOW LINE CONFORMING TO THE NATURAL CHANNEL OR CANAL..

• BOX

• PIPES

• CIRCULAR

WHICH IS TRUE IN THE STATEMENTS GIVEN?

• FOR BOX CULVERTS, THE BEDDING IS SHAPED SO THAT THE BOTTOM OF THE PIPE WILL BE IN CONTACT THROUGHOUT ITS FULL LENGTH.

• FOR CIRCULAR PIPES, THE BEDDING IS SHAPED SO THAT THE BOTTOM OF THE PIPE WILL BE IN CONTACT THROUGHOUT ITS FULL LENGTH.

IT CAN BE DONE WITH HAND OR MECHANICAL EQUIPMENT CAREFULLY DONE TO ENSURE A THOROUGHLY TAMPED FOUNDATION FILL.

• COMPACTION

• EXCAVATION

• EMBANKMENT

WHAT IS THE CORRECT ORDER PROCESS OF R.C. BOX CULVERT CONSTRUCTION PHASES

• CULVERT BASE - SIDE AND INNER WALLS - CULVERT SLAB

• SIDE AND INNER WALLS - CULVERT BASE - CULVERT SLAB

• CULVERT BASE - CULVERT SLAB - SIDE AND INNER WALLS

WHAT IS THE CORRECT ORDER PROCESS OF R.C. PIPE CULVERT CONSTRUCTION PHASES

• INSTALLATION OF PIPE - COLLARING OF RC PIPES - BACKFILLING

• INSTALLATION OF PIPE - BACKFILLING - COLLARING OF RC PIPES

• COLLARING OF RC PIPES - INSTALLATION OF PIPE - BACKFILLING