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BORED PILES
Bored (drilled) piles are cylindrical concrete structures (with or without reinforcement) that are inserted into the ground using various methods. They transfer high structural loads into deeper load-bearing soil strata, form a supporting wall for an excavation pit or topographical change or seal off groundwater when tangenting or intersected. The length, diameter, material, configuration and arrangement of the bearing piles can be modified according to the intended use.
Kelly
Kelly Pile
Classic bored (drilled) pile system which transfers torque and vertical crowd force to drilling tools via a telescopic Kelly bar.
Borehole wall is either supported by suspension or casing
Installation of casings by rotary drive, torque multiplier (BTM) or attached casing oscillators
Applicable in all types of soil (including rock) by using adapted drilling tools
Diameters 600 - 3,000 mm
Drilling depths up to 125 m
Advantages:
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Can be used in all soil conditions
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Opportunity to drill single piles and bored pile walls no vibration occurs during drilling
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Due to the casing of the borehole walls are protected from collapsing and soil layers mixing
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Opportunity visual comparison extracted soil with project specified
Deep Soil Mixing (DSM)
Method: Single Column Mixing (SCM)
DSM
The Single-Column-Mixing (SCM) method is an economical process for the construction of single load bearing columns.
The mixing tool is continuously rotated into the ground, while simultaneously adding the required slurry. The speed at which the mixing tool is advanced and the rate at which the slurry is pumped are controlled in such a way that as little excess slurry as possible returns to the surface.
Depending on structural requirements, reinforcing elements, such as steel stanchion, can be inserted into the column.
Diameters 600 - 2400 mm
Drilling depths up to 17 m
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Advantages:
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High production output
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The prevailing soil is used as a construction material
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A small amount of spoil removal (an important point when working in contaminated soil)
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Vibration-free technique
Continuous Flight Auger Pile (CFA Pile)
CFA
The CFA method is the most common single pass drilling method. It is available for BG rotary drill rigs, RTG piling rigs and MC duty-cycle cranes.
The borehole wall is supported by the loosened soil conveyed via the auger flights
Active crowd enables penetration of hard soil strata and rock socketing up to 20 MPa
Concrete is pumped through the hollow stem of the auger
Drilling and concreting process are controlled by assistant systems of the B-Tronic
Diameters 600 to 1,200 mm
Maximum drilling depths up to 50 m
Advantages:
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Can be used practically in any kind of soil
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High efficiency of pile construction
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No vibration occurs during drilling
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The piles are concreted under pressure from the bottom of the borehole
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Depending on the soil condition, the length of the used reinforced cage may reach up to 18 m
Cased Continuous Flight Auger Pile (CCFA) System
CCFA
The major application for the CCFA system is in the construction of secant pile walls. Compared to the traditional systems with fully cased bored (drilled) piles in Kelly mode or standard CFA piling, the CCFA system has advantages in costs and time.
Improved installation times
Improved verticality tolerance
Pile is protected from influence of surrounding ground (e.g. ground water)
Reduced concrete consumption
Consistent performance of drilling and concreting processes using the assistant systems
Clean jobsite due to dried soil (absence of water)
Convenient conversion of the drilling rig
Penetration through hard layers possible
Reduced noise disturbance compared to cased piles in Kelly mode
Advantages:
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Can be used practically in any kind of soil
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High efficiency of pile construction
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No vibration occurs during drilling
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The piles are concreted under pressure from the bottom of the borehole
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Depending on the soil condition, the length of the used reinforced cage may reach up to 18 m
Full Displacement Pile (FDP) System
FDP
Soil displacement piles are bored cast in-situ concrete piles constructed by advancing a displacement boring tool into the ground with a rotary drilling rig using both torque and crowd force. The preconditions for the successful deployment are modern rotary drilling rigs offering high levels of torque, downward thrust and retraction force, as well as a tall torsion-resistant drill mast. Advantages of full displacement piling:
Minimal amount of spoil material
Vibration-free installation process
Reduced concrete consumption
High bearing capacity
Advantages:
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the opportunity of piles construction without soil excavation
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recommended for use with soils that have cone resistance value qc lower than the nominal one - 10 MPa
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no vibration occurs during drilling
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high efficiency of pile construction
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The absence of excavated soil secures cleanliness of the site
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Minimal concrete consumption
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Increased bearing capacity of piles The opportunity to change the pile length
during construction -
The piles are concreted under pressure from the bottom of the borehole
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Depending on the soil condition, the length of the used reinforced framework may reach up to 18 m
Full Displacement Piling FDP-Lost Bit System
Lost bit
As a variant, the FDP soil displacement pile system can also be deployed with a sacrificial drill bit. It differs from the standard technique by a detachable fullface drill bit, a hollow drill stem with a larger internal diameter and a concrete hopper that is mounted at the top of the hollow stem. With this set-up concrete can be placed in the pile by gravity feed alone without the application of pressure. Due to the “unpressurized” placement of the concrete, excessive consumption of concrete is kept to a minimum particularly in soft soils. It also reduces the risk of the displacement body becoming jammed during concreting.
Advantages:
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The opportunity of pile construction without soil excavation
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Recommended for use with soils that have cone resistance value qc lower than the nominal one - 10 MPa
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No vibration occurs during drilling
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High efficiency of pile construction
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Minimal concrete consumption
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Increased bearing capacity of piles
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The opportunity to use the reinforcement cage along the entire length of the pile
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The opportunity to change the pile length during construction The absence of excavated soil secures cleanliness of the site
Vibro Displacement (VD)
VD
In cohesive soils it is not possible to rearrange the grains. In the vibro-displacement (VD), the added material is transported directly to the vibrator tip, compacted by multiple displacement stages and pressed into the surrounding soil. This creates a crushed rock or gravel column which improves the surrounding cohesive soil due to the greater rigidity of the installed added material. Selection of the most suitable method depends primarily on the ground at the site and on the loads to be carried
Suitable for:
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Clays
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Silts
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Silts/clays/sand mixes
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Improvement of bearing capacity
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Reduction of Settlements
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Mitigiation of liquefaction
Front-of-wall (FoW) technology
Through the special design of its two rotary heads, the front-of-Wall method (FoW) allows bores to be drilled very close to existing buildings with minimum distance, thus saving precious space, specifically in urban environment, between existing buildings and e.g. an equipment used are free of interfering edges that extend past the casing diameter. The FoW method is a vibration-free and quiet drilling method. The means of production are the same as those for the CCFA system
CONTACTS
TILTS SIA
Registration number: 50103005351
Adress: Spilves street 18, Riga, LV 1055, Latvia
Bank: OP Corporate Bank plc Latvia
SWIFT code: OKOYLV2X
Bank account number.: LV82OKOY0005100035077
To receive a quote or any other information related to your individual project, please contact our specialists by phone or email
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