Fences – Driftage control
Patent
1987-04-29
1989-04-11
Reese, Randolph A.
Fences
Driftage control
256 131, 256 35, 244110C, 244110F, E01F 702, B64F 102
Patent
active
048199150
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE PRESENT INVENTION
The present invention relates to flexible barriers. These are normally erected on slopes to protect manufactured articles such as railways, roads, villages, etcetera, from the fall of boulders.
The walls of traditional crash barriers are made up of a series of vertical poles placed a few meters apart from each other; between these, metal sheet section irons are placed,, that sustain the impact of falling boulders. This type of barrier has been shown to be very expensive: in fact it has to be extremely strong in order to take up the thrust of the impact of a boulder.
Furthermore, after every collapse, one must take care to repair such a barrier.
Other crash barriers have been studied, so-called elastic barriers, which have between two rigid vertical poles, a flexible metallic net, or a series of steel cables, arranged horizontally with a distance between them of 0.2-0.3 m, which can better take up the thurst of the impact of the falling boulders.
This structure, even if cheaper and having a longer lifespan than the rigid one, still doesn't solve the problem of the poles; these are in fact subject to breakages caused by boulders falling directly on them.
The patent FR 1.190.613 envisages poles pivoted at the lower end, and a net anchored at points along its perimeter, so that it becomes subdivided in triangles fixed at their vertices, which act independently to one another, In this case, the energy dissipation due to the falling boulder must always occur in a very limited area, thus diminishing the total load that the structure can support.
OBJECTS AND SUMMARY OF THE INVENTION
The aim of the present invention is thus to realize a crash barrier that is more resistant to impact and less subject to breakage, and thus, as a whole, cheaper than the already known crash barriers.
The above aim was attained by forseeing the sustaining poles of the barrier as hinged to a pillar or a plinth in the ground, and kept in position by a group of windbracing cables, whilst the net is sustained by a series of horizontal ropes freely sliding on the windbracing cables placed upstream, so that, at rest, the net is some distance from the poles.
Preferably, the pole is fixed to the ground in such a way as to have two degrees of free rotation.
The fixed position of every pole is ensured by two upstream and one downstream windbracing cables.
Preferably, the poles are held by the windbracing cables in such a way as to become almost perpendicular to the surface of the ground.
Furthermore, the sliding fitting between the windbracing cables and the ropes is achieved by means of two rope clamps inserted one inside the other.
The invention will now be clarified by means of an examplary embodiment that has been represented in the enclosed drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of the whole structure of the proposed
barrier;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is an exploded view of the pole and its means of attachment;
FIG. 4 is the view of the means of attachment of the ropes to the windbracing cables; and
FIG. 5 is a perspective view showing the means of attachment of the windbracing cables to the pole.
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawings, it will be noted that the crash barrier comprises poles 10 made up, for eg., by tube 11. The pole rests on the ground T by means of a base plate 12, which is fixed to the ground by anchoring means 13. To base plate 12, are attached a pair of gussets 14 that have two coaxial holes 14a. Between gussets 14, a plate 15 may be placed, which is provided with coaxial holes 15a. Through coaxial holes 14a and 15a is passed a pivot 16 that permits the reciprocal rotation of the two parts in the downstream-upstream direction and vice-versa. The plate 15 is equipped on the upper side with another hole 15b, perpendicular to the previous one, and bored in a head 15c that can be placed within tube 11. The latter is provided at its lower end with a hole 11a which can be made coaxial to hole 15b. Through
REFERENCES:
patent: 1857435 (1932-05-01), Cole
patent: 1877074 (1932-09-01), Stanziale
patent: 3351322 (1967-11-01), Mueller
patent: 4339114 (1982-07-01), Deike
patent: 4366949 (1983-01-01), Staub, Sr.
patent: 4730810 (1988-03-01), Ramband
Cuomo Peter M.
Reese Randolph A.
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