Abstract:
At present, in Astana city is going on works by construction public transport system
LRT (Light Railway Transport). LRT is an overhead road with two railway lines. The first stage
of construction is including construction of overhead road (bridge) with 22,4 km length and 18
stations. The foundation of bridge is the bored piles with cross-section 1.0÷1.5 m and length 8÷35
m. Design bearing capacity of piles is 4500÷8000 kN. For boring soil using Chinese drilling
rigs Zoomlion without casing. To maintain the walls of boreholes in sand and gravel soils using
polymer slurry. In these conditions, very important to control integrity of concrete body of each
bored piles. For checking integrity applying two methods - Low Strain Method and Cross-Hole
Sonic Logging. This paper aims to to discuss the advantages and disadvantages of each method
using the examples of a real application.
