Franki piles, also known as a driven cast in-situ pile (DCIS), are high-capacity, cast-in-place elements
constructed using a drop weight and casing.

Common uses
Provide structural support

Process
A 400mm to 600mm diameter steel casing is vertically positioned at a planned location. Gravel/sand or very dry concrete mix is  introduced into the bottom of the casing and a steel hammer with a diameter slightly smaller than the casing then repeatedly dropped inside. The mix locks into the bottom of the casing and the repeated blows of the drop weight advance the casing to the design depth. The casing is stopped from advancing further and additional drops of the hammer eject the dry mix out of the bottom of the casing. Additional dry mix is added and driven from the casing until an enlarged base is formed. Reinforcing steel and concrete are then placed in the casing and the casing is removed.

Advantages
Self-testing pile with excellent compressive and uplift capacities as well as load-deflection characteristic

Bored piles are a very effective, state-of-the-art construction element with many applications in foundation and civil engineering

Common uses

As heavy foundations, securing deep excavation especially close to existing buildings as well as stabilising and retaining slopes.

In a variety of infrastructure projects such as tunnelling, road or bridge construction as well as flood protection.

Transfer to deep rock or competent soils and withstand high loads

Retain ground alongside an excavation pit or close to adjacent buildings, often combined with other techniques such as ground anchors or soil nails
For slope stabilisation to prevent landslides, or protect existing buildings

Process
A temporary casing is installed and soil drilled out using specialized tools. If the hole requires support to remain open, additional casing or drilling fluid can be used. Full length reinforcing steel is lowered into the hole which is then filled with concrete. Bored piles can be drilled to depths in excess of 60m and typical diameters range up to 2.4m.

Advantages

• Very high load capacity
• Various diameters available from 450mm upwards
• Can be installed in a wide range of soil and rock conditions
• Minimal settlement and deformation
• Minimum vibration

Quality assurance

We use a variety of quality assurance methods for our products including top down and integrity testing, bottom bi-directional pile load  tests, and digital recording and logging of the execution parameters.

Bored piles are a very effective, state-of-the-art construction element with many applications in foundation and civil engineering. Temporary and permeant steel casings are used for a number of engineering reasons.

Common uses

Ensuring critical verticality tolerances are achieved to protect existing buildings or underground structures.

To achieve adequate pile overlap at depth when installing an interlocking (secant) pile wall Where greater lateral and shear capacity are  needed for slope stabilisation or prevention of landslides.

To bypass pile loads into unsuitable strata and avoid negative skin friction.

To temporarily support an open bore at depth.

To facilitate pile cut off levels above working platform level.

Process
A casing is installed by rotation, oscillation or vibration, soil drilled out using specialised tools, and additional lengths of casing(s) jointed and installed to a predetermined depth. Full length reinforcing steel is then lowered into the hole which is then filled with concrete. Temporary casings are then recovered.

Advantages
Can support high loads.
Can transfer loads.
Can achieve strict tolerances for verticality.
Various diameters available from 450mm upwards.
Minimal settlement and deformation.
Minimum vibration.

Quality assurance
iBM-KASTHEW PILING UGANDA uses a variety of quality assurance methods for our products including top down and integrity testing, bottom bi-directional pile load tests, and digital recording and logging of the execution parameters.

A range of digital and physical tools including inclinometers, guide walls and GPS equipped total stations can be used to assure plan position and verticality.

Continuous flight auger (CFA) piles are a type of bored cast-in-place replacement pile. Piles are drilled and concreted in one continuous operation enabling much faster installation time than for other piles of this type. Reinforcement is placed into the wet concrete after casting, enabling the pile to resist the full range of structural loading.

Common uses
Provide structural support.
Provide earth retention, especially on site boundaries or close to adjacent buildings.
Prevent landslides or protect existing buildings and are often combined with other techniques such as ground anchors or soil nails.
Infrastructure projects such as tunnelling, road or bridge construction as well as flood protection.

Process
CFA piles are constructed by rotating a hollow stem continuous flight auger into the soil to a designed depth. Concrete or grout is pumped through the hollow stem, maintaining static head pressure, to fill the cylindrical cavity created as the auger is slowly removed. The reinforcement cage is placed through the freshly placed concrete. Typically, iBM-Kasthew Piling Uganda CFA piles are reinforced with a rigid six metre-long cage as a minimum, but it’s possible to install much longer cages as and when required by the design or specification. If required, a specially developed vibrator unit can help accurately locate the reinforcement cages.

Advantages
Resists compressive, uplift, and lateral loads.

A cost efficient foundation solution.

Can be installed in most soil conditions such as sands, clays, silts, gravels and soft rock.

Can achieve pile depths in excess of 30m + and with various diameters of 300 mm to 1000mm+.

Low noise levels and no vibration so ideal in built-up areas with weak soil conditions and high levels of ground water.

Compared to bored piles, construction is very quick as temporary casings or support systems are not required.

Qua

Rotapiles uses down-the-hole (DTH) air driven hammer to advance casing during drilling, specifically for penetration through boulder profiles or hard rock socketing.

Common uses

As foundation elements for variety of structures which require penetration through boulder profiles or hard rock socketing.

Effective piling solution for river bridges and structures where alluvial/colluvial boulder profiles are present.

Effective piling solution in dolomitic or karst topography.

For piles which require large rakes or horizontal load capacities (when incorporating permanent casing)

Process
Down the hole (DTH) hammers are used to advance casing and penetrate the overburden soil. Once rock is reached the socket can be drilled uncased. The pile hole is flushed clean before full length cage is placed and the pile is grouted from the base with a tremie pipe. The casing can be removed after grouting or left in place and incorporated into the pile design. Pile diameter up to 600mm is typically  available with capacities up to 3500kN.

Advantages

Penetration through boulder profiles.

Hard rock socketing.

High lateral/bending capacities (when incorporating permanent casing).

High vertical load capacities.

Quality assurance

We use a variety of quality assurance methods for our products including top down and integrity testing and recording and logging of the execution parameter

Micropiles, also known as minipiles, pin piles, needle piles, and root piles, are a deep foundation element constructed using high-strength, small-diameter steel casing and/or threaded bars.

Common uses

Provide structural support to most structures.

Underpin foundations.

Enhance mass stability.

Transfer loads.

Process
The casing, with a diameter generally in the range of three to 10 inches is advanced to the design depth using a drilling technique.
Reinforcing steel, typically an all-thread bar, is inserted into the micropile casing and high - strength cement grout pumped in. The casing may extend to the full depth or end above the bond zone with the reinforcing bar extending to the full depth. Capacities vary depending on the micropile size and subsurface profile but compressive capacities of more than 500 tons have been achieved.

Advantages

Resists compressive, uplift/tension, and lateral loads.

Can be installed in restricted access and low headroom sites with minimal disruption to operations.

May avoid utility re-routing.

Alleviates quality assurance concerns associated with cast-in-place piling in weak soils

Can be combined with other techniques to meet unique or complex project requirements cost - effectively and efficiently

Quality assurance
iBM-Kasthew Piling Uganda has vast load test experience in various rock formations and the ability to design in-house based on various subsurface conditions.

Ductile piles are a deep foundation method using the displacement technique with prefabricated piles made of ductile cast iron available in 118 mm and 170 mm diameters with different wall thickness.

Common uses

Industrial and commercial buildings.
Warehouses.

Foundations for pipelines.

Storage tanks and terminals.

Bridge constructions.

Residential buildings.

Slope stabilisation.

Public buildings.

Pylons for electricity, cellular transmitters.

Can be grouted with mortar to take tension loads as well or to counteract corrosion

Process
A driving shoe is placed after preparation of the working platform and pre excavation of the footings. The ductile pipes are about 5 metres long and formed with a shock sleeve. The first pipe is installed into the driving shoe and then one pipe after the other stuck together and driven down until driving criteria is reached. If there are grouted piles to perform, the first pipe is cut close to the driving shoe so that the mortar is able to full fill the free space between the pipe and the soil performed by a larger diameter of the driving shoe. Diameters from 200 mm up to 370 mm are normal depending on the soil conditions Directly after installing the piles, the pile heads designed as steel load spreading plates are placed on the ductile pipes.

Advantages
High production rate per shift, average app. 350 lm / shift.

No spoil.

Can perform a pressure load capacity of 250 kN up to 1000 kN per pile.

Can make the optimum pile length according to load and soil conditions

Can be a good alternative to micropiles
Quality assurance
iBM-Kasthew Piling Uganda is very experienced in installing ductile iron piles, having installing several million linear metres over time.

The load capacity of each pile can be controlled with driving criteria and the optimum pile length achieved. Our driving