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Ram injection lance

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ground injection with ram injection lances

Steel tubes with tips and lateral discharge ports are rammed into the ground. Adapted extension tubes with or without discharge ports are available. This method is most suitable for low depths and easily penetrable grounds. The maximum setting depth depends on the ground conditions. Setting depths down to 15 m can be realised. The injection material flows into the ground through all discharge ports. On application of the separated tip the filling material flows out at the end of the lance. For injections below base plates they have to be pre-drilled accordingly. For sealing, injection packers with a connection sleeve are used.

Rammverpresslanzen

Ground injection with
Ram injection lances

 open PDF

Advantages

  • Ram injection lances can be individually combined according to the injection depth
  • With ram injection lances Ø 21.3 mm, there is no annular gap on the outside diameter during ramming, thus no uncontrolled leakage of injection material
  • Easy to handle, no need of big machines

Application

  • Determine the remedial action together with a planning specialist, a geotechnician etc.
  • Mark the grid according to the developed concept
  • Drive the ram injection lance down to the determined depth
  • Mount connecting system to the ram injection lance
  • Connect material hose and inject the injection material
  • Remove connecting system after the injection has been finished
Rammverpresslanzen - Injektion in den Baugrund
Rammverpresslanzen - Verpressen unter Bauteilen

For injections under base plates

  • Mark the grid according to the remediation concept on the base plate and drill holes
  • Ram the ram injection lances with the ramming attachment and ramming hammer into the planned depth
  • Mount and clamp the steel packer on the ram injection lances
  • Connect material hose and inject injection
  • Remove ram injection lances after completion of injection work
  • Seal boreholes with a blind packer


 

Aim

  • Filling of cavities and clefts
  • Increasing the bearing capacity of the building ground
 

Examples of applications

  • Subsoil reinforcement for existing buildings, drinking water tanks and similar facilities
  • Closing gaps and cracks in the building ground, for near-surface, underground construction measures

Information

In Germany injections into the building ground need the approval of the „Lower Water Authority“. Make sure to observe the relevant national regulations and laws prior to starting the sealing measures.

Ram injection lance G ¼''

Ram injection lance with coupling sleeve and outlet openings lateral

Rammverpresslanze mit seitlichen Austrittslöchern
Ram the ram injection lance to the desired depth, the lance combination with and without holes allows injection over the complete perforated area, e.g. 5 meter long lance, the lower 3 meters are with outlet openings lateral and are injected

Information

The coupling sleeves of the ¼'' ram injection lances have a diameter of 16 mm.

Material to be used

  • Mineral materials
  • PU and silicate resins
  • Acrylate gels
  • Foaming or expanding filling material(exclusively with Check valve)
Rammverpresslanze mit seitlichen Austrittslöchern
Rammverpresslanze mit abgedeckte, seitlichen Austrittslöchern

Ram injection lance with coupling sleeve and outlet openings covered and lateral

Rammverpresslanze mit abgedeckte, seitlichen Austrittslöchern
These ram injection lances have the same application as the ram injection lance 4 with the advantage that no impurities can penetrate through the covered outlet openings during ramming. This variant is particularly suitable for sandy soil and when crossing water-bearing layers.

Advantages/Information

  • No entry of foreign material due to cover
  • Applicable in loose, sandy soil
  • High injection safety

 

Material to be used

  • PU and silicate resins
  • Acrylate gels
  • Foaming or expanding filling material(exclusively with Check valve)

Ram injection lance with separated tip material outflow below

Rammverpresslanze mit verlorener Spitze
Ram the injection ram lance to the desired depth and remove the lance approx. 10 cm, so that the tip can be separated from the lance. Start injection, if necessary, remove lance again and inject in another level.

Material to be used

  • Mineral filling material
  • PU and silicate resins
  • Acrylate gels
Rammverpresslanze mit verlorener Spitze

Ram injection lances G ½''

Ram injection lance with separated tip - material outflow below

Drive the injection ram lance down to the desired depth and remove the lance approx. 10 cm, so that the tip can be separated from the lance. Start injection, if necessary, remove lance again and inject in another level.

Material to be used

  • Foaming or expanding filling material(exclusively with Check valve)

 

Tip with inner tube valve and 4 bores 90° displaced to each other

Drive the ram injection lance down to the desired depth. Start injection, if necessary, remove lance and inject in different areas.

Advantages and benefits

  • Injection step by step
  • Well-directed injection in a defined depth

Material to be used

  • Mineral filling material
  • PU and silicate resins
  • Acrylate gels

Ram injection lance with outlet openings lateral

Drive the ram injection lance down to the desired depth, injection is possible over the complete perforated area because of the lance combination with and without outlet openings e. g. 5 meter long lance, the lower 3 meters are with outlet openings lateral and are injected.

Material to be used

  • Mineral filling material
  • PU and silicate resins
  • Acrylate gels
  • Foaming or expanding filling material(exclusively with Check valve)

Ram injection lance without outlet openings lateral

These ram injection lances have the same application as the ram injection lances. Advantage of these is that they prevent the penetration of impurities. This version is especially suitable for sandy soil and by crossing the water bearing stratas.

Advantages/Information

  • No entry of foreign material
  • Applicable in sandy soil
  • High injection safety

Material to be used

  • PU and silicate resins
  • Acrylate gels
  • Foaming or expanding filling material(exclusively with Check valve)

 

Ramming method for Ø 10 + Ø 13 mm

  1. Screw the ramming tool onto the ram injection lance
  2. Ram the ram injection lance into the subsoil with the electric pile hammer incl. mounting tool and ramming tool
  3. Loosen the ramming tool with the cordless screwdriver left-turning
  4. Screw on the connecting sleeve, the next connecting piece, the ramming tool with 2 turns and tighten the whole ram injection lance with the cordless screwdriver (complete screw travel 40 mm)
  5. Drive the ram injection lance with the pile hammer incl. mouting tool and the ramming tool further into the ground
  6. Repeat point 3 – 5 up to the desired depth
Rammverfahren, Rammverpresslanzen

Ram injection lance G ½'' (Ø 21,3 mm) with mini inflatable packer

Ram injection lance without outlet openings lateral

Drive the ram injection lances to the desired depth, no impurities can penetrate through the covered outlet holes during ramming. This version is especially suitable for sandy soil and by crossing the water bearing stratas.

Material to be used

  • PU and silicate resins
  • Acrylate gels

Advantages/Information

  • No entry of foreign material
  • Applicable in sandy soil
  • High injection safety

Workflow - Mini inflatable packer

  • Insert the mini inflatable packer into the ram injection lance and push it to the desired position
  • Mount the filling and venting unit
  • Start injection process, the inflation hose of the mini inflatable packer is filled with injection material and is thus tensioned. When the injection pressure of approx. 14 bar is reached, the check valve opens and the filling material enters the soil.
  • The pressure has to be limited to 25 bar before starting the injection, otherwise there is a risk that the inflatable packer damages and further work is no longer possible
  • The injection is completed when the required injection quantity or injection pressure is reached
  • Release mini inflatable packer by releasing the injection pressure, pull it to next position and repeat injection
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