Safe Tunnel Sealing and Stabilisation With a
New Hybrid Injection System

1 Application of the innovative hybrid injection system HIS during a presentation in the Hagerbach Test Gallery in Switzerland Credit/Quelle: WEBAC-Chemie
1 Application of the innovative hybrid injection system HIS during a presentation in the Hagerbach Test Gallery in Switzerland
Credit/Quelle: WEBAC-Chemie
2 Schematic of the hybrid injection system Credit/Quelle: WEBAC-Chemie
2 Schematic of the hybrid injection system
Credit/Quelle: WEBAC-Chemie
3 Pump technology required for the hybrid injection system Credit/Quelle: WEBAC-Chemie
3 Pump technology required for the hybrid injection system
Credit/Quelle: WEBAC-Chemie
4 Reaction time of HIS depending on the mixing ratio Credit/Quelle: WEBAC-Chemie
4 Reaction time of HIS depending on the mixing ratio
Credit/Quelle: WEBAC-Chemie
5 Early strength development of HIS using different CEM III cements Credit/Quelle: WEBAC-Chemie
5 Early strength development of HIS using different CEM III cements
Credit/Quelle: WEBAC-Chemie
6 Compressive strength development of different CEM I and CEM III cements in comparison Credit/Quelle: WEBAC-Chemie
6 Compressive strength development of different CEM I and CEM III cements in comparison
Credit/Quelle: WEBAC-Chemie
7 HIS column test according to DIN 19631 Credit/Quelle: WEBAC-Chemie
7 HIS column test according to DIN 19631
Credit/Quelle: WEBAC-Chemie
8 TOC values of the eluate fractions from the HIS column test Credit/Quelle: WEBAC-Chemie
8 TOC values of the eluate fractions from the HIS column test
Credit/Quelle: WEBAC-Chemie

Pre-grouting and securing the tunnel face or the annular gap grouting of the segmental lining: anyone familiar with these challenges will also be familiar with the search for a safe injection process with environmentally friendly and technically mature construction materials, often even under time pressure. One solution could be the hybrid injection system from Webac-Chemie GmbH – a new injection system based on cement and reaction resin with German DIBt approval for groundwater applications.

In tunnelling and mining, it is extremely important to be able to work very quickly and safely when reaching a fault zone, in the event of a water ingress or for planned stabilisation and sealing measures. Various methods and different injection agents are available - including those based on cement, ultra-fine binders, sand, bitumen, bentonite, reaction resin and water. Depending on the soil or rock conditions and the situation on site, the advantages and disadvantages must be carefully weighed up when choosing the right method and injection agent. Webac-Chemie GmbH has developed an...

Find out more in

tunnel 01/2025

Find out more in

tunnel 01/2025

Ressort:  Injektionstechnik | Injection Technology
subscription Content

Dr. MEIK WEICKENMEIER, Managing Director/Geschäftsführer,

Dr. ANTON REICHERT, Authorized Officer/Prokurist,

Dipl.-Ing. HARALD SCHMITT, Technical Manager Tunneling & Waterproofing/Technischer Leiter Tunnelbau & Abdichtungen,

MAURICE LEISE, Sales Representative/Vertriebsbeauftragter,

STEPHAN DELARUE, Application Engineer/Anwendungstechniker,

WEBAC-Chemie GmbH, Barsbüttel/Hamburg, Germany/Deutschland

Dipl.-Ing. ROLAND HERR, International Freelance Journalist/Internationaler Freier Journalist, Wetzlar, Germany/Deutschland

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