Depending on geometry, loads and requirements for deformation, it may be necessary to secure the construction pit walls with anchoring. We can install bracing and struts inside the construction pit and at the front of the wall, when the space, execution methods and working conditions allow this. If this is not possible, e.g. if bracing inside the construction pit is inconvenient, we can install anchoring at the back of the wall. For this purpose, we normally use inclined strand anchors installed into the ground outside the construction pit.
Anchors can also be used for other types of structures – for instance, more and more structures are secured against uplift, as deeper excavation projects are carried out. For this reason, anchors are used for securing of base slabs in multi-storey basements, shafts or pumping stations. Here, the anchors are usually installed vertically as strand anchors or bar anchors (e.g. GEWI anchors).
Drilled anchors can also be used for securing of bridge abutments, stabilisation of slopes and retaining walls or as foundation elements for stay wires for masts etc. In some cases, soil nailing is used for securing of reinforcement mesh and shotcrete or grow mats on slopes.
Theoretical knowledge and practical experience
We have theoretical knowledge of and practical experience with design and execution of temporary as well as permanent anchors. Our many years of experience with installation of anchors in different types of soil and subsequent load tests provide a basis for assessment of possible anchor forces and any challenges in relation to the execution.
We offer an early dialogue about an optimum anchor solution as well as possibilities and limitations of the different execution methods based on the general requirements for the structure:
- Temporary or permanent structure
- Soil types and location of the groundwater table
- Deformation of the structure
- Neighbours
- Total stability of the entire supporting structure.
We can also assist with assessment of other factors about methods and requirements for anchoring, and we can help incorporate them in the design and planning phase, as they have big influence on the conditions and time of the execution. These factors include the following:
- Working space and access conditions for anchor drilling rig
- The anchors’ tensile bearing capacity
- Anchoring method – bar anchors or strand anchors
- Drilling method and drilling fluid
- Free length and length of the anchoring zone
- Injection of anchoring zone and possible need for reinjection
- Possible tensioning
- Corrosion protection
- Extent of anchor test.
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