Land Investigation for Bridge Construction
What information is necessary?
Data about the bridge, such as load and bridge material, lay out.
Knowledge of the location, can be obtained from others, geological maps, aerial photographs
Soil data
#Land investigation
Determine the location of the drill points required for the investigation of soil and materials
Investigation of condition of water surface (sub-surface)
Investigate material sources from the construction site
#Sub-surface Investigation
Can be done with Test Pits, holes excavated for example by using a backhoe
Can also with drilling, such as solid flight, hollow stem, rotary wash
Drilling is conducted to determine the type of soil at a certain depth, it can also at once to check the ground water level
Drilling aims for the purpose of further investigation in the laboratory to obtain information about more precise soil parameters
In Bina Marga neighborhood, bridge with span 25 m - 60 m, drilling is done by drilling machine with capacity up to 40 m
As for the <25 m, drilling is done according to the conditions. Can be used sondir tool with a hand drill up to a certain depth until obtained hard ground
the required soil investigations at each site of the foundation plan should have determined the use of the drill type and the planned drill hole position and the number of bore points at least one boring point, ie one machine drill bit or a set of hand drill and sondir, depending on the bridge plan span
This depends on the condition of the area (nature and location), the importance of the structure and the availability of testing equipment and its technicalities.
SPT is performed at a depth interval of 1.50 m s / d 2.00 m for undisturbed and disturbed sampling.
The drill bit must have sufficient diameter to get the desired undisturbed sample well, it can be used bits of steel bits for clay soil, silt and core barrel drill bit.
What to look for with drilling?
Soil classification
Soft compressible soils
Competent foundation soils
Bedrock
Ground water
As well as other sub-surface conditions that affect
Common tests performed?
SPT (Standart Penetration Test)
Plasticity (atterbergs)
Sieve
Moisture
Unit Weight
Proctor
Strength tests (unconfined, direct shear, etc.)
#sondir test tool#
[alat-tes-sondir1.jpg(
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Source reference:http://sci-geoteknik.blogspot.com/2011/10/penyelidikan-tanah-untuk-konstruksi.html?m=1