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    BORED PILES         
by Foundation Specialists

FoundationSpecialists [headquarters address]:
Legaspi Towers 200,  107 Paseo De Roxas,
Central Business District, 1226 Makati City, MM, Philippines.
Phone: (+63-2) 817-6826 

BORED PILES executed by Foundation Specialists
for more on BORED PILES click on pictures
The Specialty: 

                              Bored Piles

by               Foundation Specialists

Bored piles are cast in place cylindrical piles excavated either by use of rotary equipment operated augers , buckets, under static drilling fluid or large drill bit (for hard rock) with reverse circulation,  with chisel grab and casing oscillator for bouldery ground,  with large diameter DTH hammers and compressed air (drilled piles), among others.

Most common large diameter bored piles, are installed through an overburden of cohesive or cohesionless soil strata, with or without water tale, down to firmer ground, to achieve the design bearing capacity by skin friction, base bearing or both, to serve as foundation piles for residential, commercial, institutional buildings, industrial complexes or infrastructures.

Bored piles installed in common soil with the presence of water table, generally require the use of a short temporary steel casing and a drilling fluid as static suspension to provide support to the surrounding soil while excavating the pile and until complete backfill of the pile excavation with concrete, in order to prevent cave-in of the excavation and destabilizing the surrounding soil formation.

The preparation and handling by most effective drilling fluid, Bentonite Mud, is a sophisticated technology by itself and requires a complete set up of dedicated equipment and  (basic) field laboratory.

The most common  diameters of  bored piles range from  0.6 meter to 2.0 m meters, likewise length can range from few meter to sixty or more meters, depending upon design loads and soil parameters.

Bored piles can be heavily reinforced if required by design, rebar cages usually are prefabricated in segments with length and weight depending upon available commercial  lengths of rebars and  available lifting equipment. Splicing of rebar cages can be done  by lap splice, welded lap splice or mechanical threaded couplers. Casting is done by pouring concrete with the design strength and slump as required, through watertight segmental Tremie Pipes, starting from the pile bottom and letting the tremie pipe bottom end remain at least 3 meters submerged in concrete until the completion of pouring, to guarantee the pile continuity and the final good quality of the concrete cast.

Drilling fluids, if needed,  can be water, a suspension of bentonite (bentonite mud), a suspension of polymers, depending upon soil type, soil conditions, presence and elevation of water table, chemical properties of water table (Ph, Salinity).

Steel casings can be temporary, in which case the wall thickness is usually big enough toallow many uses, are provided with collars for easy handling by vibro hammers  and diameter slightly larger than bored piles’ nominal diameter, to allow  easy passage of drilling tools.  Permanent casings, if needed, are sacrificial casings and as such the wall thickness is as small as allowed by the need to drive the casing through the ground.

Bored piles are commonly employed for bridge foundations, on land and water, because the   versatility of bored piles design and execution allows the construction of practically any needed diameter, including the very large diameters, and the pile reinforcement can be provided as heavy as needed by seismic design and the codes (it is not uncommon to have double wall rebar cages in order to accommodate all the needed bars, however care shall be taken to leave sufficient space between bars for concrete to low through).

Bored piles are also used to form retaining walls (see, as contiguous pile wall or secant pile wall or aligned pile wall, with or without post tensioned soil anchors as tie back .

Bored piles testing is usually done in two (2) stages, first stage testing to verify design assumptions and achievable design load , is done before starting the execution of the working piles: test piles are installed in the proposed construction area, as per design, and tested, first for integrity and continuity  by P.I.T. (Pile Integrity Test) then for load bearing capacity , either by Static Load Test or by Dynamic Load Test PDA, (Pile Dynamic Analysis). At times the Designer might require a Pull-out test and a lateral load test.

Once the design pile capacity has been confirmed, Bored Piles construction  for  the working piles starts and quality control is then done on representative piles. Quality Control consists of testing the material used for the bored piles, i.e. reinforcing bars and concrete, then testing of the piles at random with PIT  and PDA, and predetermined piles with static pile load test. Predetermined piles can also be tested using the cross-hole ultrasonic test, by inserting instruments through vertical pipes installed within the reinforcing steel cage all throughout the bored pile length.                            



a Specialty of FoundationSpecialists,Inc.  is a Domain of    Foundation Specialists

The Company

Foundation Specialists ("FS " for short) is a Multinational Construction Company with Italian participation and management.
Foundation Specialists  [FS ] was formed in the 1970s by merging and consolidating into It two Partnerships with  solid background and successful accomplishments in the Engineering and Management of Large International Infrastructure  Projects.

The two Concerns that were merged to form Foundation Specialists, had, over the years dedicated to develop and manage the planning and  construction of large Underground  Hydropower Schemes, including Pump-Storage Hydropower Plants, in difficult geological and geomorphological conditions. managed through theoretical and field R & D to fine tune field applications of Geotechnical and Foundation Engineering, Soil and Rock Mechanics and develop Construction Methods and Technologies applicable to general conditions.

Because of the way it was formed,  Foundation Specialists started “ab initio”  as a leader in its consolidated  fields of expertise, i.e.  large, complex infrastructure projects with important foundation-engineering-related components.  
Foundation Specialists   has continued for the past three decades  to be a successful contractor of large infrastructure projects with sensitive Soil Mechanics & Foundation Engineering related component, and a recognized leader in the field of   Foundation Engineering applications, Deep Foundation works , Bridges & Bridge-related Engineering Works, Bridge Retrofitting, Soil Remediation, Large Excavations under the water table, Hydro-Structures and  in the Design-&-Development of Construction Methodologies and Technologies, both "ad hoc" (i.e. for specific project) and for general application.

Foundation Specialists  has been successfully engaged in a multitude of projects in coastal areas, including reclamation areas,  with high seismicity  and difficult soil conditions, bridge construction, ports & harbor works, industrial plants, Telecom outside plants, power generation and power transmission, mass-transit systems, roads & highways, road tunneling and infra development in general, in South-East Asia, Middle East, Africa and Australasia, where FS operates alone or in Joint Venture, Consortium  and Association with other Companies.
Aside from Project-based  J.V., Consortium,  Association, all usually co-terminus with the projects, Foundation Specialists  has permanent Companies and Representative Offices, in Europe: ItalySouthEastAsia: Philippines, Australasia: PNG Papua New GuineaMiddle-East:  Qatar, Dubai  UAE, Kingdom of Saudi Arabia.

Foundation Specialists  Head-Quarters are in the Central Business District of  Makati City, Metro-Manila, Philippines, where, the Philippine company Foundation Specialists, Inc. with  "AAA" PCAB category for general engineering and general building, and Large "B" for the Public Sector  Infrastructure Projects, has been engaging in the construction of large INFRASTRUCTURES [flyovers, bridges, underpasses, overpasses, wharfs & piers, tunnels, roads, mass rail transit systems, hydro power schemes and irrigation schemes], BUILDINGS (residential, commercial, industrial, institutional), INDUSTRIAL PLANTS, MULTI-LEVEL BASEMENTS, projects involving large amounts of FOUNDATION WORKS, for the last three decades.

Pioneering in the field of foundation engineering, Foundation Specialists has introduced technological innovations on foundation methods and technologies, such as large diameter bored piles, barrette piles, diaphragm walls, tie-back anchor systems, slurry walls, grout-plugs, jetgrout, whick drains, tangent/secant/contiguous pile-wall.  multi-stage-injected steel micropiles, soilcement columnscomposite soilcement columns Post-tensioned ground anchors, soil & rock anchors, soil stabilization, soil remediation, pile wallpile testing, among others.

Foundation Specialists
, a well established leader in the construction industry, has been known since inception for targeting and consistently achieving a high degree of Customer satisfaction, early projects' completion, high quality of work standards, sound financial management. FS. deep involvement in R & D, has permitted the development of technological innovations and of proprietary technologies in the field of engineering.

Foundation Specialists
  guarantees that:

Clicking the following link you will enter the HOME page of FoudationSpecialists main website

The following link will show you a list containing some of our products in the fields of General Building , General Engineering and Infrastructures

For your Foundations requirements, the following link  will show you some  web-pages of the several Special Foundation Technologies carried by our Companies

The next link will lead you to visit the web-pages of some of Foundation Specialists completed typical projects

All Departments, Activities and Specialties of Foundation Specialists are ISO-9001-2000 Certified, the following link shows the ISO certifications issued by SGS for UKAS

Pls. press the following link to get Foundation Specialists Headquarters complete coordinates

Foundation Specialists [Headquarters:]

Legaspi Towers 200,  107 Paseo De Roxas

Central Business District, 1226 Makati City, MM,


Phone: (+63 – 2 ) 817 – 68 – 26



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Contact FoundationSpecialistsFS ”  for the implementation of your projects. FS has a consistent  track  record of projects completed  on or before schedule, with full Clients’ satisfaction, and  no need of re-work.  Professional Engineers of   FS Management Teams perform in-depth Project analysis, prepare well detailed plans and    program schedules, design ad-hoc methodologies for the execution of every phase of work.   FS monitors project schedules daily and, if change of site conditions so require, FS implements corrective measures in real time.

Foundation  Specialists   is   ISO  9001-2000  Certified