View
2
Download
0
Category
Preview:
Citation preview
Geopolymer Injection - Applications for Track
Maintenance
WE KEEP YOUR WORLD RUNNING
Contents❖ Who is Geobear ❖ Technical Credentials ❖ Most Common Problems We Solve ❖ Geobear Solutions
❖ Geobear Case Studies
❖ Kentish Town Case Study - Detail
❖ Questions
UK company and global leader in non-disruptive solutions for
foundation and infrastructure settlement and subsidence
problems
Finnish family owned, with 120 employees, operating across 9
countries
London HQ remains the main business focus sourcing 60% of
company revenue
Who is Geobear?
London-based Head Office
Original founding team Uretek – the innovative Finnish ground
improvement technology company
Company successfully treated over 15,000 sites in the UK and
completed 200,000 projects worldwide
Thousands of UK residential properties successfully treated for subsidence and settlement
on all soil types
Innovator and licensor for the globally renowned alternative
geopolymer resin injection and advanced ground injection solutions
Who is Geobear?
Technical Credentials
7
Test Facilities
● Heat ageing and compressive strength testing conducted at the world-renowned, UK materials testing lab that validated the method.
● Follows the methodology of:o ISO 11346o EN ISO 2578o “Ageing of Rubber”, RAPRA 2001
8
Arrhenius Method● The Lifetime of a material at normal environmental
temperatures can be estimated from the accelerated degradation rates at higher temperatures through the application of the Arrhenius principle.
● Materials are heat aged at elevated temperatures for varying periods and the change in a property (Compressive Strength) is monitored with time.
9
Durability
● Independent durability assessment undertaken using accelerated temperature-dependent Arrhenius law for chemical reactions, as embodied in ISO 11346 and EN ISO 2578.
● Geopolymers in the ground are Chemically and Physically stable.
● Longevity significantly longer than the design life commonly required for infrastructure projects (>120 years)
Most Common Problems We Solve
11
Experience
StructuralSupportStabilisation Void Filling
GroundImprovement
Slab Track Instability & Geometry Issues
Wet BedsPoor Track Geometry Resulting
From Formation Failure
Bridge Abutments Needing Support
Voided Tunnel Linings Or Shafts
Stations Being Built Needing Structural Support
Platform Voiding Water Leaks Track-Bed Instability
12
Experience
Typical Site Injection Unit
Restricted Access mobile unit
Rail restricted Access mobile unit - within rail tunnel
environment-
Rail restricted Access mobile unit - Simplicity of the
lift -
Geobear Case Studies
18
Experience
Our Projects
Tunnel water sealing & stabilisation - Italy
Rail releveling – United Kingdom
Ilford rail depot improving – United
Kingdom
Railway base stabilisation - Croatia
Railway crossing support - Germany
19
Project: Farnham Rail Depot Slab Releveling
50%
● Farnham rail depot slabs were subsiding due to washout, crushing of loose materials, and long term consolidation of clay layers
● Geobear appointed by Osborne Rail to resolve the subsiding issue whilst keeping the rail shed open for the trains
● Fast, localised solution allowed trains to operate
● Injection of geo-polymer resins beneath the slabs, filling the voids and lifting the slabs to tolerances of +/- 10mm.
● Geobear achieved the target tolerances complying with the stringent health and safety standards.
Project Duration: 5 weeks
Location: Surrey, UK
Alternatives: Piling or breaking out and replacing the 6000m2 of slabs, not feasible due to cost and time £millions/months
Project: Farnham Rail Depot
BEFORE AFTER
21Project: Ilford Rail Depot - Ground Improvement
50%
● Part of the Crossrail development depot refurbished and required ground improvement to foundations for additional loading
● Geobear improved the bearing capacity of the ground beneath the main frame foundations and perimeter walls
● 2 load plate trials were conducted to confirm our design. 4 injections per pad and injections at 1.5m centres along the wall to depths up to 5m
● Using ground injection the foundations could support the increased loads of 350kN
Project Duration: 12 days
Location: Ilford, UK
Alternatives: Piling or Demolition
22Project: Railway Crossing in Germany
50%
● At a railway crossing in the port area of Regensburg a track of concrete has lowered and slacked (Stelcon system) to about 35mm, live traffic caused excessive track vibration.
● This problem was solved using PowerPile expanding geopolymer pillars.
● Installation of four Power piles took 1 shift, re-levelled the track to original level (raised by 32mm).
● The treated areas were reopened for the rail and road 15 minutes after the last injection.
Project Duration: 1 day
Location: Regensburg, Germany
Alternatives: The complete dismantling of the track with removal of the affected slab track and the subsequentinsertion of vibro soil stabilization, installation of a new base layer and the insertion of the track base plate.
Kentish Town Midland Mainline
Case Study
Project Kentish Town Slab Track Emergency Stabilisation WorksProject Background
o The Kentish Town slab-track was constructed during 1979 within an open-cut section of track
o Due to geological problems causing cracking of the concrete slab and differential settlement of 8-9mm a 270m length of the slab-track on the Midland Mainline suffered ongoing failure.
o The failure affected the track geometry to such an extent that it was necessary on grounds of safety to reduce speed limits from 70mph to 30mph on the affected section.
o The project was important to carry out monitoring and speedy repairs in order to maintain train movements.
Project Solution
o To achieve acceptable track geometry and stability, based on the local ground conditions and confinement, an exact calculated amounts of geopolymer resin grout was pumped at specified locations and depths.
o Once injected, the resin expands, forcing out ground water, consolidating the foundation strata, and raising the slab. The resin then hardens, forming a safe and secure base layer for the existing slab and track.
o Over a critical 51m section the slab was progressively lifted in a controlled manner between 1 and 30 mm. The ability to jack up the slab to such tolerances was absolutely critical to maintaining a safe and reliable train schedule on a key route into the capital.
o This was a temporary design enabling detailed permanent design to not be a critical issue.
o Now in detailed design for permanent solution - Option 1
Successive Ground Penetrating Radar Scans before grouting, after the Phase 1 and Phase 2 works highlighting progressive densification of the foundation strata
Photo1: injection on the down fast Photo2: injection on the down fast at second location within the four 4ft
Photos 1 & 2 show a Geobear technician is using an injection mechanism to install material via injection tubes. Multiple lasers are in situ to monitor lift across three points on the slab.
Track Monitoring Records indicating the vertical operational track displacements for different train classes, before and after the stabilisation works
Rail: Before and after stabilisation - unknown voidingKentish Town Stabilisation works
Project Finnieston Slab & Ballast track ground improvement
Project performance and the Geobear Index
Geobear Index
Geobear Injection plan
Geobear Injection Cross section
Health & SafetyHealth & Safety, Quality
o Accreditation
o Professionally trained and certified employees
o Directly employed labour
o Clean, organised worksite – self contained
o No large plant
o Less exposure to site risk due to faster installation times
o Less raw material than traditional methods
Product Safety
o Environmentally safe, inert product
o Hydro-insensitive
o Bund/Spill kits on all vehicles
o Post testing and product test information available
Get in TouchGlobal Business Established in 1983 in Finland. Company was Uretek until Dec 2017 before global rebranding as Geobear. UK business established in 1989 and currently have offices in London, Banbury and St.Helens. Global leader in non-disruptive solutions for foundation and infrastructure settlement and subsidence problems. Full in house design team - also work with 3rd party Consulting Engineers and material testing labs. We have successfully completed over 200,000 projects worldwide
Euston House, 24 Evershott Street, London NW1 1AD
enquiries@geobear.com
www.geobear.com
We keep your world running
Recommended