Hydraulic and earth engineering – Drainage or irrigation – Porous waterway – e.g. – sand drain – etc.
Patent
1998-02-19
2000-07-04
Taylor, Dennis L.
Hydraulic and earth engineering
Drainage or irrigation
Porous waterway, e.g., sand drain, etc.
405 36, 405 43, 405267, E02B 1100
Patent
active
060829281
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a novel draining wall, to a method for producing it and to an element used in so doing.
The technique of the draining wall is well known. It is a technique which is derived from that of diaphragm walls for producing continuous French drains at depths (10-20 metres and more) which cannot be reached using conventional earthworking techniques. Such drains are produced by excavating under excavation fluid and by gravel-filling successive elemental panels which become communicating as the work progresses. For this, temporary shuttering is placed at one end of each panel N to allow the filtering material (gravel) of the panel N to be retained while the panel N+1 is being excavated. This shuttering is then removed after the end of the gravel-filling of the panels N and N+1 on either side of the said shuttering.
This technique is not always suitable for producing a draining wall in sloping land liable to slippage. This is because, since the wall is continuous over its entire height and over its entire length and therefore has a large surface area and since the panels already produced or in the process of being produced are full of excavation fluid (mixed with gravel in the case of the panels produced) up to ground level, the excavation fluid exerts a great deal of thrust on the downstream face of the wall and may cause the land to slip even before the wall has entered service.
In addition, the use of simple shuttering to separate the panel N+1 in the process of being made from the panel N already produced is often tricky and, in land in which excavation gives rise to irregular trench profiles, does not make it possible to avoid filtering material leaking from the panel N towards the panel N+1 during excavation of the latter.
The current technique does not allow continuity of the wall to be checked as it is being produced. This verification cannot be done until after the excavation fluid has been removed from the entire breadth of the wall, therefore after the wall has been completed.
The current technique does not allow entry into service by installments as construction progresses.
The current technique does not allow localized maintenance operations such as cleaning and re-excavation for changing the filtering material to be carried out without placing the entire wall under excavation fluid again and therefore again encountering the aforementioned drawbacks.
Finally, the current technique does not allow a continuous drainage pipe to be laid at the bottom of the wall.
The present invention sets out to overcome these problems and drawbacks by providing a novel type of draining wall.
The present invention is based on the concept of producing the French drain one panel at a time while at the same time providing means to allow the constituent panels of the drain to be placed in communication with one another at a later time with a view to making this drain operational.
More specifically, the invention relates to a draining wall consisting of a number of elemental panels (P) filled with a filtering material (10), characterized in that the said panels are separated from one another by intermediate elements (I) moulded in the soil and in that an element (2) placing each pair of adjacent panels in communication with each other is embedded in the lower part of each intermediate element.
The invention also relates to a method for producing a draining wall in accordance with the invention, characterized in that it comprises the following steps: draining wall to be produced, these diggings or excavations being spaced apart by a distance which more or less corresponds to the length of one elemental panel of the wall and being produced under excavation fluid, tubular element including a permanent central part and destructible closed-off end parts, the said element pointing more or less along the direction of the draining wall to be produced and being slightly shorter than the digging or excavation, excavations or substituting a curable material for this fluid so as to form intermediate elements J1 to Jn
REFERENCES:
patent: 245721 (1881-08-01), Henning
patent: 320667 (1885-06-01), Marquis
patent: 1051344 (1913-01-01), McKnight
patent: 3823825 (1974-07-01), Bergles et al.
patent: 4543016 (1985-09-01), Tallard
patent: 4793728 (1988-12-01), Ellis
patent: 4863312 (1989-09-01), Cavalli
patent: 4934865 (1990-06-01), Varkonyi et al.
Deniau Alain
Soriano Alain
Soletanche Bachy France
Taylor Dennis L.
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