Rods and pins

Micropiles and nails

Micropiles

Micropiles are small diameter grouted piles with a bearing member made of reinforcing steel bars with threaded ribs BSt 500 S with nominal diameters of 28 mm, 40 mm and 50 mm or of steel bars with threaded ribs S 555/700 with a nominal diameter of 63.5 mm. These piles according to DIN EN 14199 (formerly DIN 4128) are designed to be subjected to axial loads only, i.e. tension and compression. They are therefore also suitable as an anchoring element, i.e. as an anchor pile. The same drilling and grouting technique is used for their manufacture as for grouted anchors. In the case of single-bar piles, too, a distinction is made between single-bar piles for temporary purposes (period of use < 2 years) and those for permanent use. They differ in corrosion protection including cement stone cover. According to the "General Building Inspectorate Approvals" for BBV injection piles and BBV single-bar piles, injection is only permitted via injection lances or injection valves.

Floor nailing

In soil nailing, an artificial gravity wall is constructed from naturally occurring soil. This is done using soil nails anchored in a reinforced shotcrete shell.

The soil nails increase the tensile and shear strength of the soil to such an extent that the nailed soil body can be considered and verified as a monolithic block. The maximum nail spacing is 1.5 m in horizontal and vertical direction. It may only be exceeded in the case of spatial stability verification. The boreholes are to be planned with a minimum inclination of 10 ° to the horizontal. The boreholes are drilled in the same way as for grouted anchors. The soil nails according to the general building authority approval "Soil Nailing BBV System" consist of concrete ribbed steel BSt 500 S-GEWI (IV S GEWI) with thread ribs of the following diameters: 18 mm, 20 mm, 25 mm, 28 mm, 32 mm, 40 mm and 50 mm. The soil nails are anchored on the air side by GEWI anchors that are generally approved by the building authorities.
As with grouted anchors, a distinction is made between short-term soil nails (duration of use < 2 years) and permanent soil nails. The corrosion protection of permanent floor nails must be applied in the factory.
The main areas of application for soil nailing are the temporary or permanent securing of terrain slopes, e.g. excavation pit walls and slope approaches, the securing of existing slopes and the stabilisation of loaded earth bodies during underpinning work. The wall slope is arbitrary.