To control the elevation of a building, contractors must use or establish one or more benchmarks near the building site. In this example, benchmark A (BMA) is located some distance away from the site and the contractor wants to establish benchmark B (BMB) near the site. Therefore the contractor must: (a) Transfer the elevation form BMA to establish BMB using a technique known as differential levelling (see sketch below) (b) Confirm the accuracy of the work by 'looping' back to BMA or by completing a 'circuit' to another known benchmark - in this case BMC (c) Check the mathematical correctness of the work as well as determine if the work falls within acceptable limits of 3.826 BMA ELEV. 220,000 |HI = 000022 /2.549 0.841 ΤΡΙ ELEY= HI DATUM LINE = 0.000 0.583 BMB ELEV.= HI 2.681 ELEV 1.202 TP2 HIF 66 BMC ELE/-222,226
To control the elevation of a building, contractors must use or establish one or more benchmarks near the building site. In this example, benchmark A (BMA) is located some distance away from the site and the contractor wants to establish benchmark B (BMB) near the site. Therefore the contractor must: (a) Transfer the elevation form BMA to establish BMB using a technique known as differential levelling (see sketch below) (b) Confirm the accuracy of the work by 'looping' back to BMA or by completing a 'circuit' to another known benchmark - in this case BMC (c) Check the mathematical correctness of the work as well as determine if the work falls within acceptable limits of 3.826 BMA ELEV. 220,000 |HI = 000022 /2.549 0.841 ΤΡΙ ELEY= HI DATUM LINE = 0.000 0.583 BMB ELEV.= HI 2.681 ELEV 1.202 TP2 HIF 66 BMC ELE/-222,226
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
![To control the elevation of a building, contractors must use or establish one or more benchmarks near the building site.
In this example, benchmark A (BMA) is located some distance away from the site and the contractor wants to establish
benchmark B (BMB) near the site.
Therefore the contractor must:
(a) Transfer the elevation form BMA to establish BMB using a technique known as differential levelling (see sketch
below)
(b) Confirm the accuracy of the work by 'looping' back to BMA or by completing a 'circuit' to another known benchmark
- in this case BMC
(c) Check the mathematical correctness of the work as well as determine if the work falls within acceptable limits of
TIK
3.826
BMA
ELEV. = 220,000
|HI =
000022
0.841
2.549
TPI
ELEY =
HI =
DATUM LINE = 0.000
·257
0.583
BMB
ELEV,=
HI =
2.681
1.202
TP2
ELEV =
HIS
133
BMC
ELE/-222,2266](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Febf89683-937a-4183-8535-92576d6ac261%2F4cb457eb-80bd-45f9-8874-a0ca03ed9e61%2F54qddq1j_processed.png&w=3840&q=75)
Transcribed Image Text:To control the elevation of a building, contractors must use or establish one or more benchmarks near the building site.
In this example, benchmark A (BMA) is located some distance away from the site and the contractor wants to establish
benchmark B (BMB) near the site.
Therefore the contractor must:
(a) Transfer the elevation form BMA to establish BMB using a technique known as differential levelling (see sketch
below)
(b) Confirm the accuracy of the work by 'looping' back to BMA or by completing a 'circuit' to another known benchmark
- in this case BMC
(c) Check the mathematical correctness of the work as well as determine if the work falls within acceptable limits of
TIK
3.826
BMA
ELEV. = 220,000
|HI =
000022
0.841
2.549
TPI
ELEY =
HI =
DATUM LINE = 0.000
·257
0.583
BMB
ELEV,=
HI =
2.681
1.202
TP2
ELEV =
HIS
133
BMC
ELE/-222,2266
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