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MarketsEquipmentConstruction DrillingFoundation DrillingDrill Rigs & Heavy Equipment

Linde-Griffith, Bauer Rig Work Displacement Pile Project

By Brian M. Fraley
Bauer BG 36 H drilling rig

Linde-Griffith Construction Company used a BG 36 H to install full displacement piles for this condo project in Hackensack, New Jersey.

Source: Equipment Corporation of America photos

installing full displacement piles
Linde-Griffith installed up to 25 FDPs in less than 10 hours each day, despite the short winter days and unusually wet site conditions.
installing full displacement piles

The site’s poor drainage didn’t phase the tracked BG 36 H, but Linde-Griffith did use steel plates in softer areas to keep the top-heavy rig stable, especially near slopes.

Kristen Shetler and Mike Shannon

Kristen Shetler, a staff engineer at Langan Engineering and the engineer of record, left, speaks with Linde-Griffith’s Mike Shannon.

Source: Equipment Corporation of America

Bauer BG 36 H drilling rig
installing full displacement piles
installing full displacement piles
Kristen Shetler and Mike Shannon
May 18, 2020

Linde-Griffith Construction Company may be 111 years old, but the contractor is far from set in its ways. This is why the owner and engineer of a multi-story condo project in Hackensack, New Jersey, called on them when its original contractor was unable to reach bearing capacity on a test pile program. The end result was a cost-saving switch to full displacement piles (FDP) using a Bauer BG 36 H drilling rig and custom tooling.

Linde-Griffith — founded in 1909 — was primarily a pile-driving contractor until about 20 years ago, when it expanded into foundation drilling.

“We’ve seen more and more engineers seeking techniques that offer greater capacity with less noise and vibration,” says Linde-Griffith Senior Executive Vice President Mike Shannon. “We still drive tens of thousands of piles a year, but we now specialize in all foundation types as well as ground improvement methods — not just driven piles.”

Table of Contents

  • The Switch from Driven Piles to FDP
  • The BG 36 H as the Centerpiece
  • The FDP Process
  • The Importance of the Right Tooling
  • Abundant Data and Automation
  • Strong Production in Messy Site Conditions


The Switch from Driven Piles to FDP

In the midst of densely clustered apartment buildings and businesses, the yellow mast of a Bauer BG 36 H drilling rig towered more than 90 feet over the landscape in the urban enclave of Hackensack. The Linde-Griffith field crew braved fierce 30-plus-mile-per-hour winds and single-digit windchills as the lynchpin machine of its FDP operation bored through the frosty soil. 

The roughly 6-acre pizza slice-shaped Hackensack site is framed by an active New Jersey Transit line and two roadways. An unseasonably warm and wet winter turned the ground into virtual swampland, but puddles were glazed over and the mud was like stone on this frigid January morning. 

The Hackensack project started out as a driven pile project. The previous contractor had run a pile driving analyzer (PDA) test and was unable to reach the design capacity despite installing various pile types to depths of up to 175 feet. The owner and engineer reached out to Linde-Griffith’s John Shannon looking for ideas. 

Linde-Griffith suggested using FDPs. Mike Shannon summarizes the FDP technique: “The piles don’t rest on rock here; you get your load bearing because the displacement and compaction of the soil, and the grout column builds up enough friction to meet capacity.” 

“The results were impressive when we static load tested the piles” recalls Mike Shannon. “We were able to achieve the loads they needed with a 55-foot FDP.” The decision to award Linde-Griffith the contract for production piles was clear.

The switch to FDPs was also the most environmentally sound choice, according to Mike Shannon. “They did all the remediation but still didn’t want any material to be exported,” he says. “FDP allowed us to keep all soils in the ground where they belong.”


The BG 36 H as the Centerpiece

The FDP operation revolved around the BG 36 H drilling rig. Linde-Griffith owns a fleet of drilling rigs, including two Bauers acquired from Equipment Corporation of America’s (ECA) New York/New Jersey branch. 

Linde-Griffith and ECA are 100-plus-year-old, family-owned companies with an inter-generational connection. ECA’s New York, New Jersey Regional Sales Manager Bruce Langan sold equipment to Mike’s grandfather Peter H. Shannon, PE — the first member of the family to take control of Linde-Griffith in 1971.

But the connection goes beyond Langan, according to Mike Shannon. “They’re never afraid to take a phone call and they’re always there to help you, even though they know a sale might not come out of it,” he says. “The mechanics, the sales team, the engineering staff, is what makes ECA, ECA”

It was January of 2018 when the BG 36 H executed test piles at Hackensack. The original plan was to have two rigs driving the FDP operation. The other was to be a BG 28 H. By the time permitting and environmental delays had cleared, Linde-Griffith’s BG 28 H was tied up on other projects. It was agreed that the BG 36 H would be the only drilling rig on site.


The FDP Process

Linde-Griffith worked with ECA to equip the BG 36 H with 510-millimeter (20-inch) FDP tooling to drill 1,322 piles from 52 to 57 feet. Each pile consisted of a 20-inch grout column with a 10-inch-by-¼-inch hollow pipe in the center to provide additional shaft friction. The FDPs created enough shear and base resistance that landing the pile on competent rock was unnecessary.  

Linde-Griffith executed each FDP in a sequence. First, the displacement tool bored down to the desired depth to loosen and densify the surrounding soil, leaving an open excavation. The BG 36 H, through a hollow drill stem, then pumped 4½ to 5½ cubic yards of 5,000-psi grout into each hole under pressure as it extracted the displacement tool. The rotation of the tool densified any loose material. The reinforcement cage was then dropped and, in some cases, vibrated into the fresh concrete to finish off the pile. 

“On an auger cast pile you’re relieving the pressure of the ground as you’re drilling down and the spoils are coming out,” Mike Shannon explains. “Here, you’re actually creating more pressure because the soil is staying in the ground and pushing against the sides.”

The FDPs were laid out in a grid pattern with single piles around the perimeter for grade beams and caps containing up to six piles for areas supporting the heaviest column loads.

Drilling was not especially challenging in these soil conditions, but the grid pattern and FDP process itself caused increasing resistance with each pile. “In these clusters,” Shannon explains, “the first couple are always a lot easier because you don’t have any resistance. But the more piles and concrete you put in, the more you’re displacing and densifying the soil around the existing piles and it gets tighter and tighter.”

Another challenge was that Linde-Griffith had to maintain a 10-foot distance from piles with uncured concrete. “It’s based on how your layout is with the spacing of your piles, and how you plan,” says Shannon. “With this type of pile (FDP), you need to really project two to three days ahead to maintain production.”


The Importance of the Right Tooling

Bauer tooling was critical to the FDP operation, according to Shannon. “It’s all Bauer displacement tooling designed specifically for this project,” he says. “It was engineered to achieve the required loads with these soil conditions.”

ECA’s Philadelphia’s Director of Bauer Product Sales & Service Gordian Ulrich worked closely with Linde-Griffith to design the tooling. The training also covered the B-Tronic System, setting up drilling and grouting parameters, and tying in concrete pumps. “Gordian is one of a kind,” says Shannon. “One of the best things about him is that he loves to share his knowledge and experience.”

Friction was an issue. The soil conditions and grout acted like sandpaper on the tooling, especially the displacement bulb above the auger flight and the cutting teeth on the wear plates.

“Quality control is very important out here so we change the tooling out once a week,” says Shannon, noting that extras are on hand at all times. “Then we just refurbish, re-weld, hardface, and bring them out when we need them.”

“The main concern on this job was that a driven pile couldn’t achieve the load required,” says Shannon. “Our decision to bring in the larger 20-inch full displacement tooling combined with the quality control this machine offers made this project. The amount of information you get from that machine is unique and very impressive.” 


Abundant Data and Automation

The quality control Shannon speaks of is driven by the patented Bauer B-Tronic System. Both Linde-Griffith and the project’s third-party engineer have access to such data as stroke count, grout pressure, and drilling depth via a desktop computer or mobile device. There is no second guessing whether a pile is driven to the proper depth and contains the right amount of concrete. There was also a safety benefit since the engineer was able to monitor drilling from a safe distance because B-Tronic transferred the operator’s view to an iPad.

The B-Tronic System doesn’t simply provide data. It also has a feature called B-Drive, which automates monotonous operations. Linde-Griffith’s operator, for example, was able to program the BG 36 H to drill to a specific depth by simply typing in parameters. During concrete placement, he plugged in the targeted grout volume and pressure. B-Drive automatically extracted the tooling once those numbers were achieved. Not only did this ensure a consistently grouted column, but it also allowed Linde-Griffith to share the exact amounts of concrete consumed with the owner.

The B-Tronic System is especially handy for the always on the move Linde-Griffith executive team, since they have the unique policy of having an owner on-site at every project. “We have it set up where I can view it from anywhere,” says Shannon, noting that he travels between sites all day. “I keep a laptop in my car so if I’m not here, I can see what’s going on.” The B-Tronic System allows Shannon to log in to see what his BG 36 operator can see, whether stopped along the New Jersey Turnpike or in his office. 


Strong Production in Messy Site Conditions

Linde-Griffith was installing up to 25 FDPs in less than 10 hours each day, which could have been even higher. Productivity was hampered by shorter days, muddy site conditions, and up to 45 minutes spent cleaning the BG 36 H and tooling at the end of each day. 

“You’re dealing with concrete and water in freezing conditions so you need to spend some time thoroughly washing everything out,” says Shannon. “You don’t want concrete to harden inside the machinery or you’ll have major problems the next day.”

Hackensack is prone to flooding and this particular site didn’t drain well. Mobility wasn’t an issue since the BG 36 H is a tracked machine, but Linde-Griffith did use steel plates in softer areas. This move was more about safety to keep the top-heavy rig stable, especially when working near slopes.

Linde-Griffith started drilling the first week of October of 2019 and finished by February this year. Strong production and smart planning resulted in the project completing on schedule. 

See more of the latest products and news in foundations!

Shannon knows that opportunities to shave time off a project schedule are always obvious in hindsight, but he also knows that Linde-Griffith’s recommendation to switch to FDPs saved the owner millions of dollars. “Truthfully,” Shannon says, “we just try to save our customers money.”

KEYWORDS: foundation drilling pilings

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Brian M. Fraley is owner of Fraley Construction Marketing. For more information, call 610-906-7275, email bmfraley@fraleysolutions.com or visit fraleyconstructionmarketing.com.

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Linde-Griffith Construction Company used a BG 36 H to install full displacement piles for this condo project in Hackensack, New Jersey. Source: Equipment Corporation of America photos
Linde-Griffith installed up to 25 FDPs in less than 10 hours each day, despite the short winter days and unusually wet site conditions.
The site’s poor drainage didn’t phase the tracked BG 36 H, but Linde-Griffith did use steel plates in softer areas to keep the top-heavy rig stable, especially near slopes.
Kristen Shetler, a staff engineer at Langan Engineering and the engineer of record, left, speaks with Linde-Griffith’s Mike Shannon. Source: Equipment Corporation of America

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