Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1989-04-27
1990-08-21
Taylor, Dennis L.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
405138, 405270, B09B 100
Patent
active
049501062
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method for the installation of an underground seal beneath a garbage dump by means of a driving shield forced under the garbage dump, and a device for carrying out the method.
DESCRIPTION OF PRIOR ART
A method of this type is the subject of European patent document No. EP-A 0,230,667. According to this method, two parallel trenches are dug along opposite edges of the dump, the depth of the trenches corresponding to the depth at which the dump is to be underrun. A driving shield then is forced under the dump from one trench to the other, earth being worked at its front side. Earth is filled in at the back of the driving shield and a strip of a sealing layer is thereby inserted. A power supply to and from the driving shield is run via a tunnel pipe which was erected during the underrunning of the garbage dump and which pipe is made up of individual tunnel pipe sections. When the driving shield has reached the other trench, it is turned by 180.degree. and runs under the dump in the direction of the first trench, whereby an adjacent strip of a sealing layer is inserted and, at the same time, the previously assembled tunnel pipe is dismantled. After the first trench is reached, the driving shield is again turned by 180.degree. and runs under the dump, as described above, in direction of the second trench whereby a tunnel pipe is laid anew.
A disadvantage of that method is that when the tunnel pipe is dismantled as the driving shield proceeds from the second trench to the first, the dismantled tunnel pipe sections must either be dragged along by the driving shield or transported via the remaining piece of tunnel pipe.
SUMMARY OF THE INVENTION
An object of the present invention is to improve the method in such a way that dismantling the tunnel pipe does not cause the aforenoted disadvantage.
The object is attained in accordance with the invention in which an embodiment is a method for installing an underground seal beneath a garbage dump in a strip-like manner, progressively working the earth in strips under the garbage dump with the front end of a driving shield, transporting the earth to the rear end of the driving shield, compressing the earth at said rear end, inserting a strip-like layer of a waterproof material under the protection of a cover of the driving shield, constructing and subsequently dismantling a supply tunnel pipe comprised of individual tunnel pipe sections under the protection of the cover while the driving shield is moved forward, and using the dismantled tunnel pipe sections of the one tunnel pipe to erect an additional tunnel pipe which is laterally displaced in direction toward the next strip-like layer opposite said one tunnel pipe behind the driving shield.
Another embodiment is an apparatus for installing an underground seal beneath a garbage dump comprising a driving shield for progressively working the earth under the garbage dump in adjacent strips including apparatus for transporting the worked earth to the rear end of the driving shield, apparatus for compressing the transported earth at said rear end, a cover for the driving shield, apparatus for laying a strip-like layer of a waterproof material under the protection of the cover prior to disposing worked earth thereover, a first tunnel pipe comprised of individual pipe sections located beside the driving shield, and means for dismantling the pipe sections progressively and constructing an additional pipe, using the dismantled pipe, laterally displaced from the first tunnel pipe behind the first tunnel pipe.
BRIEF INTRODUCTION TO THE DRAWINGS
Embodiments of the invention are described in greater detail below, with reference to the drawings, in which:
FIG. 1 illustrates a vertical section through a garbage dump and an embodiment of the device of the invention;
FIG. 2 illustrates a horizontal section through the garbage dump and the device of the invention; and
FIG. 3 is a further section along the line III--III of FIG. 2.
DESCRIPTION OF AN EMBODIMENT OF THE INVENTION
REFERENCES:
patent: 4636112 (1987-01-01), Raviv
LandOfFree
Method and apparatus for installation of an underground seal ben does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for installation of an underground seal ben, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for installation of an underground seal ben will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1673538