THE MAIN WALLING TYPES USED FOR ATTACHING THE SIDES OF THE PITS
"Slurry wall" is the most reliable enclosing structure, has the maximum bending moment and allows you to perform the deepest pits. But the reverse side of the coin is its value. "Wall in the ground" - the most expensive technology of fencing pits.
For the device of bored piles in watered soils, drilling is performed under the protection of the casing pipe, well concreting occurs with the help of a raised concrete pipe, the last operation is the immersion of the reinforcement cage in the uncoated concrete. For the device of protections of ditches, as a rule, apply bored piles with a diameter of 600-1000 mm. rather high durability and rigidity of piles allows to develop under their protection ditches up to 15-20 m in depth. The use of bored piles significantly increases the duration and cost of construction and does not always provide waterproof walls of the pit due to the divergence of piles at great depths.
Protection of pits from soil-cement piles
In our opinion, the most effective for pits with a depth of 10-15 m in sandy soils is the fencing of pits from soil-cement piles by jet cementation technology (Jet Grouting).
This technology has advantages:
For perception of bending moments piles are reinforced with metal pipes with a diameter of 114-273 mm or I-beams.
In terms of the enclosing structure can be made of different configurations: one row of tangent or detached piles, staggered, two rows for greater reliability, in the form of a gravitational wall.
A combined version of the device fencing pit of bored and soil-cement piles. The entire lateral load from the soil is perceived by bored piles, and ground cement piles are performed between bored piles and play the role of an anti-filtration veil.