Häny offers a range of grouting equipment with 10 pump models from 1.5 to 13m3/hr output and pressures up to 200 bar. Grout pumps in the ZMP 700 series are said to be most suitable for backfilling of tunnel liners as well as for pressure grouting.
Says Häny: “This combined use effectively saves cost and space on the backup systems of TBMs. During normal operation, the pumps are used for backfilling. In difficult ground where pre-excavation grouting is required, the same pumps are used for pressure grouting. In a HCM high-shear (colloidal) mixer which is placed near the pumps, any type of cement, including ultra-fine cements or bentonite can be efficiently mixed. Touch-panel equipped controls are available for pressure and quantity controlled backfill systems for single or two component backfill grout.”
Fully automated plant with weigh-batching, pressure and flow recording and radio remote control are designed to reduce the requirement for manpower and produce quality control documents. Containerised mixing plants with fully automated weigh batch systems can, says Häny, prepare as much as 40m3/hr of bentonite for slurry shield TBM operations.
For small bore tunnels, a two-component backfill system has been developed to place the grout mixing and pumping plant on surface. The two components are mixed in a special nozzle just before the point of injection. Distances of over 600m have been pumped, the company claims.
Häny
Tel: +41 44 925 4111
Email: info@haeny.com
Web: www.haeny.com
Grouting equipment
