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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AustriaDSI Underground Austria GmbH Alfred-Wagner-Strasse 1 4061 Pasching/Linz Austria Phone +43-7229-61049-0 Fax +43-7229-61049-80 E-mail office@dywidag-systems.at