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ground injection with ram injection lances
For this procedure, steel tubes (lances) with tips are rammed into the soil. Basically, there are two different variants:
lances with lateral outlet openings and fixed tip as well as lances without lateral outlet openings and lost tip. For the variant with fixed tip, the material is injected into the ground via lateral outlet openings. For the variant with lost tip, the injection material runs off the end of the lance. The method is especially suitable for low depths and permeable soils, in practice however, placing depths up to 15m are realised as well. The length of both variants can be adapted individually in situ according to the requirements. The maximum placing depth depends from the soil conditions.
When injecting below floor tiles, drill holes have to be made first. For sealing these drill holes, injection packers with connecting sleeves are used.
Ram injection lances can be combined individually 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 rehabiltation concept
Drive the ram injection lance down to the determined depth using the ramming tool and the pile hammer
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
For injections under base plates
Mark the grid according to the rehabilitation concept on the base plate
and drill holes
Drive the ram injection lances down to the determined depth using the ramming tool and pile hammer
Mount and clamp the steel packer on the ram injection lances
Connect the material hose and inject the injection material
Remove ram injection lances after completion of injection work
Obturate the boreholes with blind packers
Aim
Filling of cavities and clefts
Increasing the bearing capacity of the building ground
Examples of application
Subsoil reinforcement for existing buildings, drinking water tanks and similar facilities
Elevation injections
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“. Prior to starting work, make sure that all approval documents required have been obtained.
Ram injection lance G ¼''
Ram injection lance with lateral outlet openings
Drive the ram injection lance down to the required depth. The combination of lance elements with and without outlet openings allows the well-directed injection of the material.
Information: The coupling sleeves of the of the ram injection lances G¼" 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)
Check valve
Material to be used - exclusively
Foaming or expanding filling material
Advantages/Information
During assembly, the flow direction has to be observed
Coupling sleeve
The long connection sleeve (63 mm) ensures a break-proof connection.
Ram injection lance with coupling sleeve and and covered lateral outlet openings
These ram injection lances are used just 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 the covering
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)
Check valve
Material to be used - exclusively
Foaming or expanding filling material
Advantages/Information
During assembly, the flow direction has to be observed
Coupling sleeve
The long connection sleeve (63 mm) ensures a break-proof connection.
Ram injection lance with lost tip material discharge at the bottom
Ram the injection ram lance to the desired depth and pull back the lance by approx. 10 cm, so that the tip is separated from the lance. Start injection, if necessary, pull back the lance again and inject on the next level.
Material to be used
Mineral filling material
PU and silicate resins
Acrylate gels
Check valve
Material to be used - exclusively
Foaming or expanding filling material
Advantages/Information
During assembly, the flow direction has to be observed
Coupling sleeve
The long connection sleeve (63 mm) ensures a break-proof connection.
Ground injection with the ram- and injection head
The ram and injection head is used in conjunction with the G ¼" ram injection lance in slightly sandy soils for the purpose of sealing or consolidation. An enormous advantage of the ram and injection head is the possibility of „flushing“ during the ramming process. In this way, the outlet openings do not become clogged with the finde sand.
Advantage
„Flushing“ possible during the ramming process
Material to be used
Ultrafine cement
Acrylate gel
Work process
Connect ram lance with ram and injection head
Mount Geka coupling
Position the ram lance
Connect water until it emerges from transverse holes
Drive ram lance to desired depth (depths up to 3 m)
Connect the injection connection to material delivery line
Inject
After the injection process, pull the ram lance with ram and injection head out of the ground and clean it. For short lengths, it is possible to pull the ram injection lances manually by the handle.
Ram injection lances G ½''
Ram injection lance with Lost tip - material outflow below
Ram the injection ram lance to the desired depth and pull back the lance by approx. 10 cm, so that the tip is separated from the lance. Start injection, if necessary, pull back the lance again and inject on the next level.
Material to be used
Foaming or expanding filling material (exclusively with check valve)
Tip with inner tube valve and 4 bores displaced bei 90°
Drive the ram injection lance down to the desired depth. Start injection, if necessary, pull back the lance and inject in different areas.
Advantages and benefits
Injection step by step
Well-directed injection at a defined depth
Material to be used
Mineral filling material
PU and silicate resins
Acrylate gels
Ram injection lance with lateral outlet openings
Drive the ram injection lance down to the required depth. The combination of lance elements with and without outlet openings allows the well-directed injection of the material.
Material to be used
Mineral filling materials
PU and silicate resins
Acrylate gels
Foaming or expanding filling material(exclusively with Check valve)
Ram injection lance with covered lateral outlet openings
These ram injection lances are used just as the ram injection lances ([6] )with the advantage that the covers prevent the entry of impurities during the ramming process. This variant is most suitable for sandy soils and when crossing water-bearing layers.
Advantages/Information
No entry of impurities due to covering
Applicable in loose and sandy soils
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
Screw the ramming tool onto the ram injection lance
Ram the ram injection lance into the subsoil with the electric pile hammer incl. mounting tool and ramming tool
Loosen the ramming tool with the cordless screwdriver left-turning
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)
Drive the ram injection lance with the pile hammer incl. mouting tool and the ramming tool further into the ground
Repeat point 3 – 5 up to the desired depth
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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