Geo-Technical

Download Company
Brochure
Download Company
Brochure

MicroPiles

MicroPiles

 Introduction

  • Micropile [Micro piles are a  deep foundation elements with a small diameter of up to 300 mm, by means of which loads from the superstructure are transferred to lower-lying, load-bearing soil layers through skin friction] can be both drilled and grouted and have a small diameter. The steel elements in a pile are bonded into the bearing rock or soil with cement grout’s help. These piles can be quickly installed in various kinds of ground with the use of drilling equipment.

  • The micro-pile application has significantly extended to slope protection, ground improvement, and bearing capacity for various superstructures. Typically, the micropile diameter varies up to 300 mm. It can be cased or uncased, reinforced cage or single bar of designed diameter inside the micropile depending upon the type of application and loading conditions.   

  • Micro-pile performs as an excellent replacement for conventionally drilled shaft piles. Pile drill rigs allow installation in restricted access and low headroom interiors, allowing facility upgrades with minimal disruption to normal operations.

  • Micro piles can transfer tensile, compression and alternating loads. Typical applications are the foundation or strengthening of existing foundations of structures (e.g. buildings, bridges, retaining walls, masts etc.) or uplift restraint for structures in groundwater.

  • Micropile can be catgeorized in two types, Self drilling Hollow bar and Solid Bar 

  • HOLLOW BAR PILES

  • Hollow bar piles [self drilling hollow bar pile ]consist of three main components:

  • the pile head,
  • the steel tendon or compression member - includes coupler and
  • lost drill bit - and
  • the grout body [By changing the drill bit at the end of the hollow bar, micropiles can be installed into practically any soil or weathered/weak rock type]

  • The steel tendon or compression member is a hollow steel bar with a cold rolled round thread and can therefore be cut or joined at any desired point.

Common Uses

  • Provide structural support
  • Underpin foundations
  • Enhance mass stability
  • Transfer loads

Technical Details

  • Micropiles are also known as minipiles, pin piles, needle piles, and root piles. The micropile casing generally has a diameter in the range of 3 to 10 inches.  typically an all-thread bar, is. The finished micropile (minipile) resists compressive, uplift/tension, and lateral loads and is typically load tested in accordance with ASTM D 1143 (compressive), ASTM D 3689 (uplift/tension), and ASTM D 3966 (lateral). Capacities vary depending on the micropile size and subsurface profile. Allowable micropile compressive capacities of more than 500 tons have been achieved.
  • This technique has been used to support most types of structures.
  • Micropiles can serve to “stitch” the soil together within predicted shear zones to enhance mass stability. In liquefiable profiles, micropiles can transfer loads to competent bearing strata to follow seismic design requirements.

For planned foundations in areas with multiple underground utilities, utility re-routing may be avoided. Limited access equipment can eliminate the need to modify or shutdown facility operations. Additionally, micropiles greatly alleviate the quality assurance concerns associated with cast-in-place piling in weak soils.

Service Life [ Corrosion Protection of Micropile ]

  • Temproray application : 2 Years 
  • Self drilling Permenant MicroPiles : 50 Years
  • Solid Bar Permenant Micropile : Up to  100 Year for Double corrosion protection bars, Other categroies of bars are available according to target service life according to soil aggresivity Using Sacrifical bar can be an option by means of adding larger bar size that are allowed to corrode during service life, not recommended into tension
  • Galvanized Bar is another option, for more details about service life our team will assist finding out the best choice 

What is a hollow bar micropile?

Hollow bar  anchors are manufactured from high yield micro alloy steel tubing. Hollow bars  are installed using the injection bored method, which involves pumping at  pressure a cementious grout while the anchor is drilled into the grout. This  method has many geotechnical benefits and it improves a project’s overall  efficiency.

Advantages of Micropiles:

  • Fast one-step installation
  • Simultaneous drilling and grouting
  • Allows the use of smaller equipment at lower cost
  • Allows low overhead, limited access installation
  • Improves the ground (densification)
  • Offers higher skin friction
  • Total single corrosion protection by design
  • No Vibration during installation of piles
  • Micropile design Manual - Download Link 
  • Drill hole diameters for micropiles
  • System description 
  • Single and Double Protection accessories 
  • Tension and compression micropiles components 

Main standards for steel nuances

  • Europe : EN 10083-1​
  • UK :  EN 10083-1 ​
  • USA :  EN 10083-1

Accessories

  • Rotary injection adapters to connect between the hammer and the hollow bar, enable grout to be injected into a rotating bar
  • Drill bit adaptor sleeves offer the option of using larger diameter drill bits with smaller bars
  • Range of drill tooling including reducing couplers, box/pin adaptors and drill spanners
  • Corrosion protection options include grout cover, sacrificial corrosion allowance, hot-dip galvanizing, Duplex (hot-dip galvanizing and epoxy coating)
  • Bearing plates with angle compensation or shear tubes
  • Hex nuts, couplers and steel spacers
  • Pinch Valves allowing the installation of micropiles within sites with a high-water table, without the need to dewater.

Durability

  • Sacrificial Corrosion Allowance; This technique calculates the loss of steel over the proposed design life of the soil nail or micro pile based on the total surface area of the bar. The residual strength of the bar is then calculated based on the remaining cross sectional area of steel, this can then be assessed against the required working load of the bar. The quantity of steel loss is based on research in accordance with TRL 380, EN14199, CIRIA C637. Corrosion rates are determined by the aggressive levels of the soil in accordance with the values outlined in the standards. In most cases, highly aggressive ground conditions don’t occur naturally and are only present in locations formerly used  or industrial processes which have contaminated the soil

  • Supplementary Galvanizing; in accordance with EN1461 hot dipped galvanizing will provide an additional 5-15 years lifespan, depending on aggressive of the soil, for buried installations. This method when applied to the top bar, located at the soil / air interface ,the most corrosive area, provides a practical basis for increasing lifespans but minimises additional cost. Corrosion in the deeper parts of the borehole is less prevalent due to the lack of oxygen. A fully galvanized system can be adopted if the project specification requires it.

  • Duplex Coatings; comprises an additional Epoxy Powder coating (80-90 µm) over the hot dipped galvanizing. Although the coating can be damage during rotary percussive installation the remaining Epoxy Coating will provide an additional protective benefit especially in the valleys between the threads, where the Epoxy coating generally remains intact. Loss of Epoxy at the crest of the thread is common, but this part of the bar tends to have a greater wall thickness forming the thread ridge and has greater resistance to corrosion. Any visible damage to the Epoxy coating can be repaired with a two-pack Epoxy paint “touch-up” kit.

 

Approvals

  • Usage of Micropiles approved by Local Authorities in Saudi Arabia, UAE [ Dubai Muncapility ], Oman and other Countries where Esolution Function 

For more information, contact us at info@esolution-pt.com

 

 

 

NEWS

  • 29 Jul 2023

    ESPT AWARDED NEW SOIL NAIL SUPPLY DESIGN AND SUPERVISION IN SAUDI ARABIA

    ESPT Saudi Arabia awarded a new design,  supply supervision and testing of micropiles in Khobar, Saudi Arabia, the so...

    Read More
  • 04 Mar 2021

    Esolution Awarded Supply and installation of Pre-tension Girders in Cairo-Egypt

    Mostaqbal City Bridge project been designed as Pre-tensioned Girders onsite precast concrete, where Esolution have supplie...

    Read More
  • 04 Mar 2021

    Esolution Saudi Arabia Completes additional Multi strand Anchorage testing

    Esolution construction and Engineering have taken extra mile for Qaulity assurance for bridges work, whereas Esolution bee...

    Read More
  • 15 Jan 2021

    ESPT- Dubai is now functioning with European Approved Multi-strand system

    ESPT Dubai - United Arab Emirates is introducing multistrand anchorages system 2 to 37 strands European approved system in...

    Read More
  • 19 May 2020

    Esolution Awarded a new Bridge Posttensioning work in Saudi Arabia

    esolution construction and Engineering Saudi Arabia have been awarded supply and application of posttension concrete works...

    Read More
  • 19 May 2020

    Esolution Receives ministry of transportation Approval in Saudi Arabia

    Esolution construction and Engineering receives min...

    Read More
  • 05 Mar 2020

    ESPT Approved as Posttension supplier in Dubai

    ESPT Posttension concrete supplies are now being approved with

    Read More
  • 04 Oct 2019

    Esolution adds bars to its portfolio

    Esolution adds Prestressing bars to its products range to the market, the application range as follows:

    Read More
  • 04 Oct 2019

    esolution adds new range of PT anchorages to its profile

    esolution construction and Engineering in Saudi Arabia and Dubai is now offering a new range of European technical approve...

    Read More
  • 04 Oct 2019

    esolution adds new range of PT anchorages to its profile

    esolution construction and Engineering in Saudi Arabia and Dubai is now offering a new range of European technical approve...

    Read More
  • 11 Feb 2019

    Esolution Dubai branch completed a design of new structure

    esolution construction and Engineering Dubai branch completed a design of new structure that been re...

    Read More
  • 16 Aug 2018

    esolution Dubai completes a four new Precast concrete buildings design

    esolution Dubai completes a two new Precast concrete buildings design includes cast at site parts of the structures, the s...

    Read More
  • 16 Aug 2018

    esolution construction and Engineering Dubai awarded Alloft Hotel design of posttension concrete slabs

    esolution construction and Engineering Dubai awarded Alloft Hotel design of posttension concrete slabs, the porject consis...

    Read More
  • 30 Mar 2018

    Esolution receives Dubai Municipality approval for construction of Posttension concrete slabs in Dubai

    Esolution Dubai recieves Dubai muncapility approval fo...

    Read More
  • 23 Dec 2017

    Esolution complete the design of precast concrete structure using Revit

    esolution construction and Engineering design team completes the design, segmentation and fabrication drawings for precast...

    Read More
  • 23 Dec 2017

    esolution awarded a new Posttension concrete project in Alexandria-Egypt

    esolution awarded a new project for the design and construction of posttension concrete in Alexandria-Egypt, the project b...

    Read More
  • 23 Dec 2017

    esolution awarded a new Posttension concrete resturant project in Dammam-Kingdom of Saudi Arabia

    esolution awarded a new project for the design and construction of posttension concrete Dammam- Kingdom of Saudi Arabia, t...

    Read More
  • 21 Oct 2017

    esolution completes posttension work in Saudi Arabia-Makkah, Islamic Relief tower-10

    Esolution construction & Engineering completes the de...

    Read More
  • 21 Oct 2017

    esolution Design team rectifies the design of hotel building in Jeddah

    The hotel complicated design has been awarded to esolutio...

    Read More
  • 29 Nov 2016

    esolution completes RAJHI Showrooms in Riyadh

    AlRajhi showroom in Riyadh is four floor building with an area per floor of 4000 Square meters, the challange in the desig...

    Read More
  • 08 Mar 2016

    esolution spoke to construction week online magazine on PT construction in GCC

    esolution construction and Engineering spoke to construction week online magazine on PT construction in GCC, esolutio...

    Read More
  • 17 Jan 2016

    Esolution accepted block work contract in Lulu hyper Market In Saudi Arabia

    Lulu Hypermarket 

    LuLu Hypermarket, the retail division of the multidimensional and multinat...

    Read More
  • 13 Jan 2016

    esolution Management to Upscale Egypt's Team skills to train them on the Building information modeling

    esolution Management recognizes the importance of people training and development and to align the team in different ...

    Read More
  • 13 Jan 2016

    Rahaf Al Masha'ar hotel in Mecca-Saudi Arabia is now functioning

    esolution construction and engineering compeleted the design and construction of the hotel in six months, the tower redesi...

    Read More
  • 12 Jan 2016

    Tilt up education at BIG-05, Kuwait

    y: Mohamed Zaid, CEng. M. ASCE, Design Manager , Associate member – ACI-551 / ACI-...

    Read More
  • 11 Jan 2016

    TILT-UP CONCRETE CONSTRUCTION AWARENESS RAMPED UP IN EMERGING COUNTRIES

    By: Mohamed Zaid, CEng. M. ASCE

    When compared to other d...

    Read More
  • 11 Jan 2016

    INTERNATIONAL ISLAMIC RELIEF TOWER IN MECCA - THE CHALLENGE

    The porject is located in Mecca with three towers on same basement , its very traditional con...

    Read More
  • 22 May 2015

    Arabian Business :Rotana to open first two Centro hotels in Saudi , esolution awarded the posttension concrete construction of the project

    Arabian Business on Rota...

    Read More
  • 22 May 2015

    esolution construction & Engineering completes the first six slabs - Rotana Hotel in 2 months

    esolution contruction & ENgineering compelets the first six slabs in two months , expecting the contract compilation w...

    Read More
  • 04 May 2015

    esolution Construction and Engineering merges with esolution investment

    esolution Construction and Engineering merges with esolution investment and starts to work in real state in Egypt , the tw...

    Read More
  • 03 May 2015

    e-solution Supports charity health Care in Cairo-Egypt

    Charity care

    Charity care is a health care service provided for free or at reduced prices to low income pat...

    Read More
  • 29 Mar 2015

    Tilt up education at BIG-05, Dubai

    By: E-Solution / Mohamed Zaid, CEng. M. ASCE, Associate member – ACI-551 / ACI-423

    The B...

    Read More
  • 02 Feb 2015

    Cooperation Council for the Arab States of the Gulf building in Riyadh - design and construction of posttension concrete slabs by Esolution

     Cooperation Council for the Arab States of the Gulf

     مجلس التعاون لدول ...

    Read More
  • 01 Feb 2015

    esolution Starts working on LULU Hypermarket- Riyadh

    Esolution has started work on LULU’s hyper market in Riyadh-Kingdom of Saudi Arabia , the project with area of 120 t...

    Read More
  • 01 Dec 2014

    International Islamic Relief Constructs new tower in Mecca for orphans - Structure design , PT design and supply by esolution

    The International Islamic Relief Organization,  هيئة الإغاثة ا...

    Read More
  • 02 Oct 2014

    Gulf Business - UAE’s Arabtec To Launch Phase 1 Of Mega Egypt Housing Project By Year-End- Design Shared by esolution

    Read More
  • 01 Oct 2014

    esolution introduces BIM solution in Saudi Arabia

    Building information modeling

    Building Information Modeling (BIM) is changing how buildings, infrastructure, and...

    Read More
  • 03 Jun 2014

    esolution construction and Engineering design affordable housing units in Egypt-Cairo using aluminium concrete forms

    Read More
  • 02 Jun 2014

    AL-JOUF UNIVERSITY - FACULTY OF MEDICINE - POST TENSION CONCRETE FLOOR SLABS

    l-Jouf region is located in the northwestern part of the Kingdom of Saudi Arabia, and an area (139.00) km, a population of...

    Read More
  • 04 Mar 2014

    Pearl Compound in Al- Khobar-Saudi Arabia

    esolution construction & Engineering awarded the design and construction of post tension floors in Pearl compound , th...

    Read More
  • 01 Sep 2013

    esolutuion PT completes 125 slabs construction in Rabia Community -Riyadh

    Watch Video 

     esolution construction and Engineering awarded the&...

    Read More
  • 01 Jan 2013

    esolution run a presentation on posttension concrete water tanks to ministry of water and electricity - Riyadh Saudi Arabia

    esolution  run a presentation on posttension concrete water tanks to ministry of water and electricity - Riyadh Saudi...

    Read More
  • 04 Nov 2012

    Hilton - Obikan Towers post-pensioning concrete floors by Esolution - Riyadh

    solution construction and Engineering re-evaluated the design of the tower as desired by the client to enure that original...

    Read More
  • 12 Jul 2012

    FACULTY OF ENGINEERING-AL TAEF

    Esolution construction & Engineering approved by ministry of higher education as sub cons...

    Read More
  • 01 Mar 2012

    Taif University - Faculty of Engineering - design and detailing by esolution - sub consultancy service

    esolution construction and Engineering hired as a sub consultant to value Engineer the project , reducing the cumlative co...

    Read More
  • 02 Feb 2012

    Arabnews - Hilton Worldwide has announced the signing of a management agreement with Obeikan Real Estate Development Company

    Hilton Obikan - Riyadh

    Read More