Hydraulic and earth engineering – Bank – shore – or bed protection – Revetment
Patent
1981-01-03
1984-10-09
Husar, Cornelius J.
Hydraulic and earth engineering
Bank, shore, or bed protection
Revetment
405 19, 405168, E02B 312, F16L 104
Patent
active
044758464
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method of placing a web on an entrenchment below the ground water level. Usual methods of placing such a web consist of first draining the entrenchment at the start of a constriction project so that the web can be placed in a simple way. Draining the water does however also affect the ground water level in the area outside the entrenchment and therefore, draining is not always allowed at the beginning of a constrication project. A typical example is an entrenchment for a road near a wildlife habitat.
SUMMARY OF THE INVENTION
The invention provides a solution for the above problem. According to the invention, the solution is achieved by wrapping the web around a core or roll, floating the core or roll in either the entrenchment or a water course which is connected with the entrenchment, and subsequently navigating the wrapped-up core or roll to the beginning of the entrenchment, after which unwinding and attachment of the web takes place.
Such a web is preferably formed by connecting lengths of web material segments, cut off at size substantially parallel to the center line of the core or roll, to preceding lengths of web material segments. The web segments can be connected by welding or adhering.
The length of the core should substantially be equal to the resultant width of the entrenchment. If a road is concerned which has to be processed in this way, it is determined according to the invention, that the resultant width of the entrenchment is realized by enlarging the projected width by applying at least one flood verge.
Unwinding takes place after the core is positioned by pumping water from the entrenchment at the location where the web still has to be applied, to the location between the initial edge of the web and the core. During this pumping, a braking moment and braking force is preferably exerted on the core.
In order to apply the method according to the invention also a number of installations is necessary. The floating core is for instance formed so for that purpose, that, while being pivotal about its own axis by means of moment arms, it is connected to at least one pontoon, the pontoon being provided with winches to bring the core in the correct position.
Furthermore means are necessary to lower compression means with the aid of guide cables to secure the web edges, provided with ring eyes, to structure parts, positioned under water. For this purpose, the guide cables extend between screw eyes, present in a concrete clamping edge, to for instance auxiliary scaffolds or one or more derrick barges, dependent upon the nature of the intermediary structures. Preferably, barbed bars are provided between the guide cables and screw eyes.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be further elucidated hereinafter on the basis of the drawings, in which by way of example an embodiment is shown of an installation to apply the method according to the invention. In the drawings:
FIG. 1 an abridged cross-section of an entrenchment having some installations at the left adapted to be used when applying the method according to the invention, and having at the right an entrenchment profile with a flood verge under the water level, all this substantially according to the line I--I of FIG. 2;
FIG. 2 shows a schematic plan view of the installations of FIG. 1;
FIG. 3 shows a longitudinal section of an entrenchment at the location of a part of a structure protruding above the water, to elucidate the beginning of the web placing process;
FIG. 4 shows details of the guide means of FIG. 3; and
FIG. 5 shows a longitudinal section of an entrenchment at the location of a structure which does not protrude above the water level, on the basis of which the end of the web placing process is elucidated.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIGS. 1 and 2, the equipment at the left includes a working floor 1 having a length which is equal to the resultant width of a web which is wound on a reel 2. The resultant width of the web may be, for example,
REFERENCES:
patent: 2390403 (1965-12-01), Van der Rest
patent: 2570271 (1951-10-01), Pickett
patent: 3302709 (1967-02-01), Postlewaite
patent: 4090337 (1978-05-01), Szekeres
patent: 4260288 (1981-04-01), Ellers et al.
Kruyt Jacob A.
Nette Aart
Hollandsche Beton Groep N.V.
Husar Cornelius J.
Stodola Nancy J.
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