DRILLING PILE CONSTRUCTION METHODS
Kelly construction technology
The classic system of bored piles - using a telescopic Kelly bar,
the wall of the borehole is strengthened with a special casing pipe. The pipe is pushed into the well and the well is cleaned to the design depth mark. In the cleaned well is immersed a reinforcement frame is made specially for the borehole and the borehole is filled with concrete.
When the borehole is completely filled with concrete, the casing pipes are pulled out and the borehole is proportionally filled with the remaining concrete.
Diametrs: 620 / 750 / 880 / 1000 / 1180 / 1200 / 1300 / 1500 / 1800 / 2000mm _cc781905-5cde -3194-bb3b-136bad5cf58d_Length: 96 m
Advantages:
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Can be used on all types of soil.
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It is possible to make bored piles both standing alone and bored pile walls.
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No vibrations occur during drilling.
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Thanks to the casing pipe, the walls of the boreholes are protected from the mutual mixing of landslides and soil layers.
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It allows you to visually compare the composition of the drilled soil with that specified in the project.
Deep Soil Mixing (DSM)
Method: Single Column Mixing (SCM)
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)
The CFA method is the most common single pile drilling method.
During drilling to the intended depth, the drill bit is rotated and pushed into the ground at a certain speed.
After taking the drill out of the hole, it is filled with concrete. When the hole is completely filled with concrete, a reinforcement frame specially designed for the hole is pressed into it. Thanks to BAUER technology, we are able to drill holes in various types of soil.
Diameter: 450 / 550 / 600 / 750 / 880 / 1000 / 1200 mm
Length: 31 m
Advantages:
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Can be used on almost all soil types
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High efficiency of drilling piles
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No vibrations occur during drilling
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Concreting of piles is done by pressure from the bottom of the borehole
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Depending on the type of soil, the length of the applied reinforcement frames can reach up to 18 m
Cased Continuous Flight Auger Pile (CCFA) System
Construction of bored piles and bored pile walls with continuous auger and casing CCFA. Compared to traditional systems with fully bored Kelly piles or standard CFA construction techniques, the CCFA system has advantages in terms of cost and time.
Improved installation times and vertical tolerance.
Thanks to the casing pipe, the walls of the boreholes are protected from the mutual mixing of landslides and soil layers.
Consistent execution of drilling and concreting processes using auxiliary systems. Reduced concrete consumption due to pile concreting
occurs with pressure from the bottom of the well.
Diameter: 420 / 510 / 620 / 710 / 750 / 880 / 1000 mm
Length: 22.9 m
Advantages:
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Can be used on all types of soil
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No vibrations occur during drilling
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High efficiency of drilling piles
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Drilling can be used in hard-to-reach places
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The possibility of making bored piles both standing alone,
both pile walls.
Full Displacement Pile (FDP) System
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
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Diameter: 320 / 410 / 450 / 520 / 620 mm
Length: 40.2 m
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
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during construction
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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 framework may reach up to 18 m
Full Displacement Piling FDP - Lost Bit System
Production of bored piles without removal of soil FDP - "Lost bit" (DSP) with a bit remaining in the soil. FDP - "Lost bit" technology is also known as Drilling with a driven pile system DSP - occurs thanks to
for torque and compression force.
The soil is loosened with the FDP/DSP drilling tool (with a bit) and pushed out on the sides of the hole. Using a telescoping Kelly rod and with controlled pressure, the FDP/DSP tool is drilled into the ground to the design depth mark. Then the reinforcement frame is inserted into the DSP tool (casing tube with a closed end), which can be both full and partial length of the pile.
Using FDP - "Lost bit" tool, the "Lost bit" tip is left in the hole and the hole is filled by feeding concrete with pressure from the bottom of the well.
FDP – “Lost bit” (DSP) it is possible to build piles in different soil types, including clay, sediments, peat, sand, moraine. Construction of DSP piles is also possible in dense sand up to bedrock.
Diameter: 510 / 550 / 620 / 710 mm
Length: 40.2 m
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) technology
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
Sheet pile wall technology
Economical to construct and versatile in application – these are the main advantages of steel sheet pile walls. Dismantling is also possible without a problem. As a temporary measure, sheet pile walls are used to safeguard excavation pits, for example when there is no space for a slope or sealing is required to protect against pressing water. They are also used as retaining walls or to stabilize inclines. A sheet pile wall can be constructed in different ways, depending on the composition of the construction soil and the nearby buildings: by driving, pressing or impact driving.
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
SIA TILTS
Registration number: 50103005351
Address: Spilves iela 18, Riga, LV 1055, Latvia
Bank: OP Corporate Bank plc Latvia
SWIFT code: OKOYLV2X
Bank account number: LV82OKOY0005100035077