Enhanced method for clamping rock bolt

Reference number
Coordinator RISE Research Institutes of Sweden AB - CBI Betonginstitutet
Funding from Vinnova SEK 860 000
Project duration June 2019 - December 2020
Status Ongoing
Venture The strategic innovation programme InfraSweden2030
Call Solutions for sustainable transport infrastructure

Purpose and goal

The main objective of this project is to develop a paper packet filled with sufficient amount of non-shrinking cement-based mortar/grout that is used as corrosion protection between the rock surface/shotcrete and the back side of the dome plate during installation of the rock bolts. The idea is to solve one of the biggest problems that have been repeatedly identified in connection with the installation of rock bolts in the Swedish mining and tunneling industry to increase the durability of the rock anchors.

Expected results and effects

The solution should be simple, cost-effective to produce, and easy to install without special equipment. The new method should simplify quality control during installation. In addition, the material waste should decrease, and productivity increase compared with today´s technology. The new technique will reduce the physical workload, risk of contamination, and mental stress of the laborers. The product should fulfil the design requirements, especially the designed service life, reduce the need for inspection/maintenance during the operation and thus the life cycle costs.

Planned approach and implementation

The project is carried out in six work packages. It begins with the development of the cementitious mortar (WP1) and the paper packet (WP2) with the required properties. Full-scale laboratory tests will be carried out in WP3 to evaluate and optimize the efficiency of the system. In WP4 the feasibility of the new solution will be demonstrated in the field. In WP5 the extent of the environmental advantages and the cost benefits of the project are revealed by life-cycle assessment and life-cycle cost analysis. Finally, WP6 is dedicated to organization and monitoring the progress of all tasks.

The project description has been provided by the project members themselves and the text has not been looked at by our editors.

Last updated 10 April 2019

Reference number 2019-01144

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