Vibro-replacement

Vibro-replacement compaction

Vibro-replacement compaction

The process of vibro-replacement:
1. Positioning of the bottom-feed vibrator guided on the leader
2. Material bucked fills feeder pipe with intended material
3. Vibrator is put into operation and penetrates the ground down to the projected depth using rope crowd force and supported by compressed air. Soil is placed to the side.
4. Vibrator is pulled up a little, installation material is filled with compressed air, then pressed again while continuing to vibrate (“stuffed”).
5. Finished vibro-replacement column with better interlocking

Vibro-replacement is used to improve cohesive soil types. Thereby, coarse extraneous material is filled into the vibrating hopper and a load-bearing gravel or crushed stone column is produced. If the crushed stone columns are arranged in a grid the building ground can be improved area-wide.

Deep compaction with the vibro-replacement method

  • The so-called bottom feed vibrator which penetrates a fine grained, non-compactable soil is fitted with a device for addition of material.

    Dry process with material addition

    The so-called bottom feed vibrator which penetrates a fine grained, non-compactable soil is fitted with a device for addition of material.

  • Vibration is carried out under addition of compressed air emerging at the vibrator tip and supporting the vacated space.

    Installation with compressed air

    Vibration is carried out under addition of compressed air emerging at the vibrator tip and supporting the vacated space.

  • After the final depth has been reached the vibrator is systematically hoisted. Gravel or crushed stone are filled in through the material feeder and emerge at the vibrator tip under addition of compressed air.

    Addition of extraneous material

    After the final depth has been reached the vibrator is systematically hoisted. Gravel or crushed stone are filled in through the material feeder and emerge at the vibrator tip under addition of compressed air.

  • Repeated lowering of the vibrator compacts the added material. Moreover, it is densely pressed and/or stuffed into the adjacent soil.

    Vibro-replacement

    Repeated lowering of the vibrator compacts the added material. Moreover, it is densely pressed and/or stuffed into the adjacent soil.

  • Alternating hoisting and lowering of the vibrator combined with batch filling with material produces a so-called vibro-replacement column.

    Vibro-replacement column

    Alternating hoisting and lowering of the vibrator combined with batch filling with material produces a so-called vibro-replacement column.

  • Filling with extraneous material with subsequent stuffing creates a load-bearing gravel column with a greater strength than the untreated ground.

    Foundation concept

    Filling with extraneous material with subsequent stuffing creates a load-bearing gravel column with a greater strength than the untreated ground.

  • Smaller groups of columns result in a selected soil improvement. An area-wide improvement with extensive column grids is applied, for example, under dams or foundation plates.

    Range of applications

    Smaller groups of columns result in a selected soil improvement. An area-wide improvement with extensive column grids is applied, for example, under dams or foundation plates.

Vibro-flotation

Vibro-floating compaction

Vibro-floating compaction

The process of vibro-flotation:
1. Vibrator is hoisted on position
2. Vibration is activated and rope slowly lowered. Supported by jetting force of the pressurised water.
3. After projected depth water jetting is reduced
4. Pulling step by step under vibration. Funnel-shaped settlement is filled by adding gravel.
5. Compacted soil structure of cylindrical shape

For vibro-flotation non-cohesive soil is compacted using a deep vibrator. The vibrator is mounted on the lower end of a pipe on a lift crane, duty cycle crawler crane or rig, either free hanging on ropes or via a leader and sunk into the ground. Through the vibration the soil grains change from their initial loose layering to a denser layering. Around the vibrator a cylindrical compacted soil structure is created.

Deep compaction with the vibro-flotation method

  • Thanks to the vibration effect and to its own weight the deep vibrator penetrates the ground.

    Vibro-flotation

    Thanks to the vibration effect and to its own weight the deep vibrator penetrates the ground.

  • In order to support the installation process, jetting water or compressed air emerging from the vibrator tip are added.

    Flushing water

    In order to support the installation process, jetting water or compressed air emerging from the vibrator tip are added.

  • Extraction of the vibrator is executed in predetermined hoisting steps and intervals. Thereby the surrounding soil is compacted.

    Compaction

    Extraction of the vibrator is executed in predetermined hoisting steps and intervals. Thereby the surrounding soil is compacted.

  • While the soil is compacted step by step, coarse material is filled into the funnel-shaped settlement.

    Addition of material

    While the soil is compacted step by step, coarse material is filled into the funnel-shaped settlement.

  • Reinforced cylindrical ground structures are created at the compaction points. These are arranged in various grid patterns and so a systematic compaction of the building ground is achieved.

    Foundation concept

    Reinforced cylindrical ground structures are created at the compaction points. These are arranged in various grid patterns and so a systematic compaction of the building ground is achieved.

  • Vibro-flotation is intended for compacting loose soil types and artificial fills, so leading to an area-wide improvement of the building ground.

    Range of application

    Vibro-flotation is intended for compacting loose soil types and artificial fills, so leading to an area-wide improvement of the building ground.

Video vibro-replacement

An LB 24 rotary drilling rig equipped with a bottom feed vibrator

The video shows an LB 24 rotary drilling rig in operation with a deep vibrator mounted on the leader. Play video

An LB 24 rotary drilling rig equipped with a bottom feed vibrator

Find your product