Pile Foundation contractors in Andhra Pradesh
BORED CAST IN SITU PILE
Tractor Mounted Hydraulic Rotary Rig (Direct Mud Circulation Method)
The system is very useful in congested areas where noise is prohibited.- Here the bore is made by drilling the ground using a Tractor Mounted Hydraulic Rotary rig.
- The boring is done with the raimmer which has provision for sending bentonite solution under pressure.
- The bored muck is carried to the sur face by the circulating bentonite (So it is called direct mud circulation system) Once the hard strata is reached socketing will be done if required.
- The stratum for termination is identified by conducting Standard Penetration Test.
- Once the boring is complete the borehole is washed by circulating fresh water continuously.
- The specific gravity of the out flow solution is measured using hydrometer to ensure that the bore is properly cleaned.
- Then the reinforcement is lowered followed by tremmie and the concreting is done
DRIVEN CAST IN-SITU PILE
MAX DIA 600MM [ IS 2911 PART(1) SEC(1) ]
- Driven piles are installed by driving a casing pipe.
- The soil investigation reports are based on the N-value.
- The casing pipe is driven by single acting drop hammer with the required height of fall.
- This is determined by the state of compaction of the soil strata.
- Soil investigation report based on the N-value also decides this.
- Casing reaches the hard strata beyond which the rate of penetration is very small, concrete is poured with the help of chute cart, and the casing is extracted progressively, simultaneously tamping the tube as the tube is extracted
As the name suggests, driven piles are installed by driving a casing pipe whose outer diameter represents the nominal diameter of the pile. The casing pipe is driven by a single-acting drop hammer with the required height of fall determined by the state of compaction of the soil strata. This is obtained from the soil investigation report based on the N-value. Once the casing reaches the hard strata beyond which the rate of penetration is very small (This is termed as set. The set is defined as the penetration for a given number of blows; say for example this can be 10mm for the final 10 blows) concrete is poured with the help of chute cart, and the casing is extracted progressively, simultaneously tamping the tube as the tube is extracted.
The three main advantages are:
- The state of compaction is assessed as the tube is driven by observing the number of blows required for a constant depth of penetration
- The energy imparted to the soil by driving the tube compacts the surrounding soil which helps in the increase of friction capacity of the pile
- The tamping of the tube while extraction creates serrations in the pile shaft which ensures the mobilization of the shaft friction.
PRE-CAST DRIVEN CONCRETE PILE
MAX SIZE 500 MM X 500MM [ (IS 2911 PART (1) SEC (3) ]
- The piles are cast in a specially made platform/casting yard.
- These square shaped piles are of maximum 500mm X 500mm size.
- Sometime octagonal in shape.
- The pile is driven to a set using drop hammer.
- All the advantages of driven cast in situ pile are available in this case also.
In the case of pre-cast driven pile, the pile is cast in a specially made platform/casting yard The pile is generally square shaped up to a maximum size 500mm X 500mm. Occasionally octagonal shape is also used. Well-designed casting and stacking arrangements are practiced at site. The pile is driven to a set using drop hammer selected based on the size, pile weight and capacity requirement All the advantages of driven cast in situ pile are available in this case also.
OUR STRATEGIC SUSTAINABILITY
Precast Concrete Pile may be defined as a reinforced concrete pile which is moulded in circular, square, rectangular or octagonal form. The precast concrete pile are cast and cured in a casting yard and then transported to the site for driving. In case space is available, pile can also be cast and cured near the site of works. They are driven in a similar manner as timber pile with the help of pile drivers. The diameter of the pile normally varies 35cm to 50 cm and their length varies from 45 in to 30 m.
Contiguous Pile
Contiguous pile walls consist of piles arranged in a line typically with a 150mm gap between the piles. Where required the soil between the piles can be stabilized using grouting techniques if necessary, either before or after pile installation.
Common uses
- Support of excavations
- Slope stabilisation
- Support wing walls
Process
Contiguous pile walls can be retained by anchors or strutting systems to reduce deflection though commonly for walls up to 7-8 metres in height they are designed to work in cantilever.
Advantages
- Limited load from surrounding structures taken
- Allows easier work in open excavations when in cantilever
Quality assurance
We use the latest technology, testing regimes and best practice protocols developed over many years to ensure the position, verticality and structural integrity of our pile walls.
Secant Pile
A secant pile wall consists of overlapping (secant) piles to form structural or cutoff walls and achieve the required water tightness. The design can incorporate steel bar or beams for reinforcement and anchors can provide additional lateral support, if needed.
Common uses
- Slope stabilisation
- Enable and support excavations
- Support bulkheads
- Water cut off
Process
Secant pile walls consist of reinforced and non-reinforced piles. The unreinforced piles are usually installed first and consist of cement or bentonite. The reinforced piles are then installed and the reinforcement can be either cages, I-beams or H-beams.
Secant pile walls retained by anchors or strutting systems are often supported by a waler beam to distribute the loads (prevent punching of anchor/strut through the pile) and as a mitigation measure for the unlikely event of an anchor/strut not carrying the load. This waler beam can be constructed as a reinforced concrete beam casted towards the pile wall, or by using steel profiles to be fixed to the piles and anchors/strutting systems.
Advantages
- Can be constructed in a wide variety of soil conditions, including through cobbles and boulders
- Very little deformation and settlement on the outside
- Can carry high loads from surrounding structures
- Less vibration during construction
Quality assurance
We Veda Pile Foundation use the latest technology, testing regimes and best practices protocols developed over many years to ensure the position, verticality and structural integrity of our pile walls.
Our Service Areas
- Pile Foundation contractors in Anantapur
- Pile Foundation contractors in Chittoor
- Pile Foundation contractors in Godavari
- Pile Foundation contractors in Guntur
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