【Utilities – Civil Engineering Version】20181117
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Surveying for the foundation construction of the chimney (). A: When the excavation of the foundation pit approaches the designed elevation, horizontal stakes are set up on the inner walls of the pit to serve as a basis for checking the elevation of the pit bottom and for laying the cushion layer. B: After the bottom of the pit is compacted, two thin strings are pulled from the positioning stakes, and a hammer is used to mark the center of the chimney at the bottom of the pit. C: Wooden stakes are driven in to serve as reference points for the center of the cushion layer. D: When pouring the concrete foundation, rebar should be placed at the center of the foundation as a marker. E: Using a theodolite, the center of the chimney is marked relative to these reference points, with a “+” symbol being used as a guide for controlling the center position of the chimney during construction. Answers: ABCDE
A: When the excavation of the foundation pit approaches the designed elevation, horizontal stakes are set up on the inner walls of the pit to serve as a basis for checking the elevation of the pit bottom and for laying the cushion layer. B: After the bottom of the pit is compacted, two thin strings are drawn from the positioning stakes, and a hammer is used to mark the center of the chimney at the bottom of the pit. C: Wooden stakes are driven in to serve as reference points for the center of the cushion layer. D: When pouring the concrete foundation, rebar should be placed at the center of the foundation as a marker. E: Using a theodolite, the center of the chimney is marked relative to these reference points, with a “+” symbol being used as a guide for controlling the center position of the chimney during construction
C: Drive a wooden stake as the central control point for the bedding layer