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Various types of equipment can be used, depending on the ground conditions and the project: kelly-mounted or hang grab, KS 3000 or Hydrofraise. The widths can vary from 0.52 to 1.52m : standard widths are 0.62, 0.82, 1.02 m.
Depths of 35 to 50 m are commonly achieved. The Hydrofraise can reach 150 m.
Operations generally proceed with adjacent primary and secondary panels.
The length of panels may vary from 3 to 20 m : 5 to 6 m is the common average size.
JOINTS: In most cases, use is made either of stop-end casings or Stopsol-type joints which are withdrawn once concreting of the primary panel is completed or CWS-type joints with lateral withdrawing. With the Hydrofraise, it is also possible to dig short secondary panels with the cutters biting in the concrete of the adjacent primary panels, thus making a direct concrete to concrete joint.
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Continuous reinforced concrete core walls are vertical walls made in spans of up to 7 metres in length and thicknesses between 0.45 and 1.50 metres, and depths of up to 70 m, and offer a solution to excavation difficulties in urban areas or around the water table level.
To install core walls in the ground, mechanically-driven grab buckets are used with weight ratings of between 5 and 23 Tons and grab openings of between 2.60 and 4.20 metres. This type of grab bucket can be adapted to practically any type of soil and depth.
To install core walls on rocks, excavation techniques and plant is used for thicknesses of 0.60, 0.80, 1.00 and 1.20 metres and depths of up to 60 metres.
They are used in a large number of projects (bearing structures, provisional or definitive retaining walls, etc.) and represent a solution to different problems such as the excavation of buried structures such as underground car parks and basements, subways, etc., to the creation of subsoil waterproofing in loose material dams.
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MAIN APPLICATIONS
-Major urban excavations in the aquifer
-Underground reservoirs or access shafts to deep sewers
-Open or below grade trenches :
highways
railways
underground railways
-Deep, load-bearing foundations :
linear X or H-shaped supporting
walls to lower high loads
retaining walls
MAIN PLANT USED
-Cable-operated grab :
width from 520 to 1520 mm
mounted on standard or hydraulic crane
-Hydraulic grab with Kelly :
guided and equipped with inclinometer controlling verticality
possibility of correcting verticality with the so-called "active grab"
-Hydraulic cutter
used in hardened ground
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Circular access shaft, diaphragm wall diameter: 58m,
thickness 1 m, depth: 21 m.
Cutoff curtain 60 m deep (29,000 m2).
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The CDW (Continuous Diaphragm Wall) system is based on equipment that allows cutting a slot in the soil by means of a cutting module, and its immediate filling with concrete. The cutting module has the thickness and the length as set by the project.
The wall installed through a continuous working cycle (excavation and filling) and therefore - thanks to construction times that are thoroughly active - industrial productions are considerably higher compared to those obtained by means of traditional techniques.The particular system adopted to discharge the waste material, which is not polluted with the presence of mud, contributes in making the whole working area extremely clean.
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Definition:
reinforced concrete wall moulded in the ground where the excavation (typical 2,8m with 8,5m) is held open using a purée containing bentonite
Characteristics:
thickness of the wall 0.5m, 0.6m, 0.8m, 1m, 1.2m and 1.5m
standard depth until 35m, exceptionally until 55m and more
sealing waterkering wordt gegarandeerd door een dubbel waterstopvoegprofiel
vertical capacity bearing non-negligable
length of the panel is equal to either once the length of the hook or approximately 2.5 times the length. The length of the hook is approximately 2.8m with 3.3m (standard of hook).
low walls guides necessary
it is necessary to envisage place for the bentonite power station (100m ²)
considerable joists of installation of the building site
traditionally not of continuous horizonteaux reinforcements in the slurry trench walls: beam of distribution in head necessary.
Scope of application:
wall retaining the grounds and water
resumption of the vertical efforts
excavations along the existing buildings
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PRECASTING OF PANELS
The panels are made of reinforced or prestressed concrete.
Precasting is done in an industrial process; manufacturing of heavy panels of 40 tonnes is commonly achieved.
Whenever possible, the precast factory is installed on the site. If this is not feasible, the panels are brought on trailers from an outside precasting yard.
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|
Various types of equipment can be used, depending on the ground conditions and the project: kelly-mounted or hang grab, KS 3000 or Hydrofraise. The widths can vary from 0.52 to 1.52m : standard widths are 0.62, 0.82, 1.02 m.
Depths of 35 to 50 m are commonly achieved. The Hydrofraise can reach 150 m.
Operations generally proceed with adjacent primary and secondary panels.
The length of panels may vary from 3 to 20 m : 5 to 6 m is the common average size.
JOINTS: In most cases, use is made either of stop-end casings or Stopsol-type joints which are withdrawn once concreting of the primary panel is completed or CWS-type joints with lateral withdrawing. With the Hydrofraise, it is also possible to dig short secondary panels with the cutters biting in the concrete of the adjacent primary panels, thus making a direct concrete to concrete joint.
|
|
|
|
|
|
Continuous reinforced concrete core walls are vertical walls made in spans of up to 7 metres in length and thicknesses between 0.45 and 1.50 metres, and depths of up to 70 m, and offer a solution to excavation difficulties in urban areas or around the water table level.
To install core walls in the ground, mechanically-driven grab buckets are used with weight ratings of between 5 and 23 Tons and grab openings of between 2.60 and 4.20 metres. This type of grab bucket can be adapted to practically any type of soil and depth.
To install core walls on rocks, excavation techniques and plant is used for thicknesses of 0.60, 0.80, 1.00 and 1.20 metres and depths of up to 60 metres.
They are used in a large number of projects (bearing structures, provisional or definitive retaining walls, etc.) and represent a solution to different problems such as the excavation of buried structures such as underground car parks and basements, subways, etc., to the creation of subsoil waterproofing in loose material dams.
|
|
MAIN APPLICATIONS
-Major urban excavations in the aquifer
-Underground reservoirs or access shafts to deep sewers
-Open or below grade trenches :
highways
railways
underground railways
-Deep, load-bearing foundations :
linear X or H-shaped supporting
walls to lower high loads
retaining walls
MAIN PLANT USED
-Cable-operated grab :
width from 520 to 1520 mm
mounted on standard or hydraulic crane
-Hydraulic grab with Kelly :
guided and equipped with inclinometer controlling verticality
possibility of correcting verticality with the so-called "active grab"
-Hydraulic cutter
used in hardened ground
|
|
Circular access shaft, diaphragm wall diameter: 58m,
thickness 1 m, depth: 21 m.
Cutoff curtain 60 m deep (29,000 m2).
|
|
The CDW (Continuous Diaphragm Wall) system is based on equipment that allows cutting a slot in the soil by means of a cutting module, and its immediate filling with concrete. The cutting module has the thickness and the length as set by the project.
The wall installed through a continuous working cycle (excavation and filling) and therefore - thanks to construction times that are thoroughly active - industrial productions are considerably higher compared to those obtained by means of traditional techniques.The particular system adopted to discharge the waste material, which is not polluted with the presence of mud, contributes in making the whole working area extremely clean.
|
|
|
|
|
|
Definition:
reinforced concrete wall moulded in the ground where the excavation (typical 2,8m with 8,5m) is held open using a purée containing bentonite
Characteristics:
thickness of the wall 0.5m, 0.6m, 0.8m, 1m, 1.2m and 1.5m
standard depth until 35m, exceptionally until 55m and more
sealing waterkering wordt gegarandeerd door een dubbel waterstopvoegprofiel
vertical capacity bearing non-negligable
length of the panel is equal to either once the length of the hook or approximately 2.5 times the length. The length of the hook is approximately 2.8m with 3.3m (standard of hook).
low walls guides necessary
it is necessary to envisage place for the bentonite power station (100m ²)
considerable joists of installation of the building site
traditionally not of continuous horizonteaux reinforcements in the slurry trench walls: beam of distribution in head necessary.
Scope of application:
wall retaining the grounds and water
resumption of the vertical efforts
excavations along the existing buildings
|
|
PRECASTING OF PANELS
The panels are made of reinforced or prestressed concrete.
Precasting is done in an industrial process; manufacturing of heavy panels of 40 tonnes is commonly achieved.
Whenever possible, the precast factory is installed on the site. If this is not feasible, the panels are brought on trailers from an outside precasting yard.
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