BULLFLEX® Pile Sleeve Hoses
2
Introduction
BULLFLEX® pile sleeve hoses have been developed as a system solution for foundation engineering; the main application of this system are large diameter reinforced piles. Other applications are drainage piles or GEWI® micropiles. The BULLFLEX® system consists of patented textile groutable hoses made of high-strength fabric, which are
subsequently filled with a building material, featuring an excellent sealing and load-bearing capacity.
BULLFLEX® groutable hoses are available in different dimensions, allowing an optimum alignment to the excavation dimensions. All system components are light-weight as well as easy to transport and install.
DSI Underground has long-time experience in the application of BULLFLEX® pile sleeve hoses.
With the engineering and on-site support of DSI Underground, this system solution has been successfully used for various global infrastructure projects.
Contents
Introduction .......................................................................................................................................................................................... 3
Fields of Application ............................................................................................................................................................................. 4
Main Advantages .................................................................................................................................................................................. 4
System Description .............................................................................................................................................................................. 4
System Components ............................................................................................................................................................................ 5
Large Diameter Reinforced Piles .......................................................................................................................................................... 5
Specifications ....................................................................................................................................................................................... 5
Installation Procedure ........................................................................................................................................................................... 6
BULLFLEX® in Underground Excavation .............................................................................................................................................. 7
3
Fields of Application
■ Large diameter reinforced bored piles ■ Protection of existing infrastructure in the proximity of pile fields
■ Vertical de-coupling of defined sections
■ Piles in areas with high groundwater tables or karstic rock formations
■ Grouting sleeves and protection against washout
■ Drainage piles ■ GEWI® micropiles: grout socks, packers, and borehole plugs
Main Advantages
■ Customized and project-specific system solution
■ Low transport weight and volume ■ Fast, easy, and safe mounting due to prefabrication
■ Pressure rating up to 4 [bar] (58 [psi]) ■ Flexible application under limited space conditions
■ Easy compensation of eccentric and uneven excavation surfaces
■ Corrosion-resistant, shrink-free, and UV-resistant material
■ High resistance against tearing ■ No additional corrosion protection system required
■ Filling with various building materials possible
■ Retaining of the building material while the water is drained through the special filter effect of the BULLFLEX® fabric
System Description
■ Limitation or bridging of cavities ■ No loss of building material due to uncontrolled leakage
■ Boundary against ingress of soil material ■ Improvement of bonding and load-bearing capacity
■ Reduction of negative skin friction ■ Optional de-coupling of load transfer in defined layers by using several layers of BULLFLEX® groutable hoses
■ Surplus water in the grout fill is immediately drained, featuring an accelerated curing procedure
4
BULLFLEX® Pile Sleeve Hose
Cavities free of Concrete
Ground
Reinforcement Cage
Filling Material: Concrete
System Components
■ BULLFLEX® groutable hoses made of polyamide 6.6 ■ Patented, endless round woven textile ■ Installation into a pre-drilled borehole ■ Defined interface to the ground ■ Air and water permeable ■ Diameter: ≥ 230 [mm] (9 [in]) ■ Off-size diameters and special designs available on request
■ Special features pile sleeve hoses ■ Couplings for pile extension ■ Upward lift control grouting valves at the bottom of the pile
■ Circumferential straps to avoid overstretching
■ Optional integration of a BULLFLEX® sealing assembly
■ Filling material ■ Concrete, sand/gravel, or cement grout in case of GEWI® micropiles
Large Diameter Reinforced Piles
Specifications
Characteristics 1) Unit Value Remarks
Material [–] Polyamide 6.6 NylonWeight [g/m2] / [oz/yd2] Approx. 660 / 19.5
Fabric thickness [mm] / [in] Approx. 1 / 0.04
Minimum tensile strengthL 2)
T 3) [N] / [lbf]12,000 / 2,69824,000 / 5,395
100 [mm] / 3.94 [in] widthAccording to ISO 10319
Corresponding maximum elongationL 2)
T 3) [%]2020
According to ISO 10319
Elastic elongationL 2)
T 3) [%]1515
According to ISO 10319
Minimum seam strength [kN/m] / [lbf/ft] 155 / 113
Airflow through fabric at pressure [mbar] ([psi])
10 (0.15)20 (0.30)30 (0.45)
[l/min] / [gal/min]6.5 / 1.713 / 3.419 / 5.0
At 100 [cm2] / 15.5 [in2]
Residual tensile strength [%] 20 - 30After 1 year and under light
exposure in Florida
1) The indicated values are laboratory values and may deviate on-site 2) Longitudinal 3) Transversal
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Installation Procedure
■ Prefabrication reinforcing cage (mounting of the sleeve) ■ Pile sleeves with or without base plate and valves for lowering
■ Fixation of the pile sleeve onto the reinforcement cage ■ Installation of the first pile segment
■ Simple coupling of sleeves for longer piles ■ Connection of reinforcement cages and sleeve hoses
■ Reinforced sleeves in the area of anticipated cavities ■ Filling with concrete or sand/gravel (drainage piles)
■ Avoid contact with any sharp edges in order to prevent the fabric from being damaged ■ During mounting and filling, all default and recommended personal protective equipment must be used
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Support Pillars
Roadway Packs and Dams
Roof Support Backfilling
Structural Bulkheads
BULLFLEX® in Underground Excavation
Hard RockMining
CoalMining
MineRehabilitation
TunnelRehabilitation
TBM’s andFoundations
Support Pillars
Auxiliary standing support, artificial
pillars, and cornerslumps
Secondary support in room & pillar and
longwall mining
Repair works in overstressed or fault zone areas and rehabilitation of visitor mines
Roof Support Backfilling
Backfilling of steel support for
permanent main roadways
Yielding support system –
displacement minimization
Re-establishment of the load-bearing
capacity and yielding ability of destructed
tunnel linings
Foundation and prestressing of pipe umbrella support or rib support systems
Temporary steel frame support for the construction of
cross-cuts
Roadway Packs and Dams
Multiple entry roadways, gaseous seams, and deep mining operations
Structural Bulkheads
Sealing against backfilling media
Permanent sealing of roadways Partition of storage or waste facilities
Stoppings Ventilation walls, sealings, and face shuttering
Structural Sealings
Sealing of existing re-lined tunnels and annular gaps of civil
structures
O-ring sealings:launch and receptions
of TBM’s, sealing against water (liquids) and compressed air
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www.dsiunderground.at
“BULLFLEX®” is a trademark of BuM Beton- und Monierbau GmbH. DSI Underground is a partner of BuM Beton- und Monierbau GmbH.
Please note: This brochure serves basic information purposes only. Technical data and information provided herein shall be considered non-binding and may be subject to change without notice. We do not assume any liability for losses or damages attributed to the use of this technical data and any improper use of our products. Should you require further information on particular products, please do not hesitate to contact us.
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