FR2843417A1 - Device to stop helicopters landing in prisons to assist escapees, uses oval poles assembled in sections and having caps that support network of wires - Google Patents

Abstract

The anti-landing device consists of a set of poles (1) with wires (5) threaded over the top to form a mesh. Each pole is made up of a series of tubular modules (2) with an oval section assembled using joining sleeves (9). The lowest module is attached to a base set in the ground, and the top module has a cap (4) where the wires are attached (20,21). The wires may be electrified.

Description

The present invention relates to an anti-landing device

  helicopter consisting of a set of posts at the top of which is hung a set of crisscrossed ropes so as to define an essentially horizontal mesh.

  In recent years, there has been an increasing number of attempts to escape prisoners by helicopter, which have often been successful. Such escapes are prepared by accomplices who learn to fly helicopters, then fly one, taking the pilot hostage if necessary, to place him in the courtyard of a house.

  stop at the time of the prisoners' walk.

  To oppose such escape attempts, the authorities are increasingly considering equipping the outside areas of prisons or remand prisons with devices intended to prohibit the landing of helicopters.

  Such devices generally consist of a set of posts made of reinforced concrete which support a mesh

  horizontal defined by a set of intersecting lines.

  However, such a technique proves to be cumbersome, expensive and sometimes difficult to implement depending on accessibility, in particular in the occupied zone.

  In addition, the support posts for ropes made of reinforced concrete are relatively easy to climb, which greatly affects the efficiency of the device.

  The authorities therefore aspire to be able to have a light helicopter anti-landing device that is easy to assemble and capable of equipping all existing or new sites, with a minimum of resources.

  The object of the present invention is to provide a device 30 of the aforementioned type capable of meeting these requirements.

  This device is characterized in that it comprises a set of posts each constituted by a series of essentially identical metallic tubular mounting modules having an oval section, assembled by means of connection sleeves of corresponding section which fit into them these at their ends and are fixed

  by bolts inserted in suitable threaded holes provided for this purpose on the mounting modules on the one hand and on the connection sleeves on the other hand.

  These posts can be made of galvanized steel, aluminum or any other metal or metal alloy having

  adequate mechanical characteristics.

  The section of the posts, oval in shape, has proven to be particularly advantageous in preventing any attempt at climbing; the dimensions of this one can vary according to the own constraints

  at each site (height and positioning).

  According to the invention, the lower mounting module is fixed to a base resting on the ground; the upper mounting module is 10 topped by a protection module equipped with members

  for attaching cables to which it is assembled by a connection sleeve.

  Each post generally comprises three to five mounting modules having a height of the order of 3 m.

  According to another characteristic of the invention, each of the connection sleeves is equipped at its central part with wedging lugs protruding at its external periphery to bear on the

  edge of an associated mounting module located below.

  The presence of these wedging pins makes it possible to guarantee the juxtaposition of the tapped holes of the mounting modules and the connection sleeves.

  The height of the various connection sleeves can advantageously be of the order of 0.8 m.

  Each of these sleeves is of course equipped with threaded holes 25 located on either side of the wedging lugs to allow it to be assembled with two adjoining associated mounting modules.

  According to another characteristic of the invention, the base is constituted by an essentially circular metal fixing plate provided at its periphery with a series of perforations allowing its anchoring 30 on the ground or a foundation element covering the latter, and at his party

  central of a base sleeve having a section similar to that of the connection sleeves which is welded to this plate at its lower part.

  The fixing plate as well as the base sleeve are generally made of steel with a thickness of the order of 10 mm.

  According to the invention, the base sleeve is also equipped on its periphery with threaded holes allowing the fixing of the lower mounting module as well as positioning shims of this

  module, and through holes drilled below the positioning shims to allow the evacuation of condensed water.

  According to another characteristic of the invention, the protection module consists of a tubular metallic element having a cross section similar to that of the mounting modules and generally a

height of the order of 1.20 m.

  An essentially circular metallic attachment plate provided at its periphery with a series of perforations allowing the fixing of a first set of cables is welded to the upper part of this tubular element.

  According to the invention, an essentially circular metal attachment plate also provided at its periphery with a series of perforations allowing the fixing of a second set of cables is also welded to the lower part of the protection module. 15 The presence of these two attachment plates which are preferably of the same diameter makes it possible to have a horizontal double mesh, in particular of 4 × 4 m, making it possible to safely exclude any

  helicopter landing attempt.

  According to the invention the lower attachment plate is mu20 nie at its middle part of a recess corresponding to the section of

  connection sleeves and further comprising reservations corresponding to the wedges of these sleeves at its periphery.

  The presence of this recess and these reservations makes it possible to guarantee the perfect juxtaposition of the threaded holes allowing the assembly of the upper connection sleeve with the module

  upper mounting and protection module.

  The upper attachment plate is in turn preferably capped with a conical end welded thereto.

  This tip has the function of preventing any recovery of a candidate for escape at the head of the post if, by extraordinary means, he succeeds

  to climb it and reach that level.

  According to another characteristic of the invention, the device comprises at least one removable anti-climbing harrow interposed between

two adjacent mounting modules.

  Such a harrow is generally constituted by a metal crown of shape corresponding to the section of the modules of

  mounting and provided at its periphery with a series of metal spikes.

  The median orifice of this metal ring is similar to that fitted to the lower attachment plate and therefore has a section corresponding to that of the connection sleeves and is equipped at its periphery with a series of reservations corresponding to the wedging lugs equipping these sleeves. According to the invention, the device is also preferably equipped with equipment means such as lighting means or a

  high or low current electrification system.

  According to the invention, an assembly module can thus advantageously be equipped with fastening members for low electrical cables.

  voltage fitted at their ends with porcelain cable support.

  According to another characteristic of the invention, the electrical cable fastening members are designed to have a tensile rupture of the order of 40 kg so as not to be able to act as a grip for a candidate for escape trying to climb the poles.

  The characteristics of the helicopter anti-landing device which is the subject of the invention will be described in more detail with reference to the accompanying drawings in which: - Figure 1 is a schematic view of a rope support post, 20 - Figure 2 is a section of such a support by a transverse plane, - Figure 3 is a front view of a connection sleeve, - Figure 4 is a sectional view of Figure 3 along the transverse plane

IV-IV,

  - Figure 5 is a sectional view of the post shown in Figure 1 in a longitudinal plane at the junction of two adjoining mounting modules, - Figure 6 is a front view of the base, - Figure 7 is a top view of the base, - FIG. 8 is a front view of the lower part of the post repre30 felt in FIG. 1, - FIG. 9 is a top view of the post shown in FIG. 1, - Figure 10 is a top view of the lower hooking plate, Figure 1 1 is a top view of an anti-climbing harrow, - Figure 12 is a front view of the anti-climbing harrow shown 35 in FIG. 11, FIG. 13 is a detail of FIG. 1 showing the organs of

  fixing of low voltage electric cables.

  According to FIG. 1, the anti-climbing device comprises a set of metal posts 1.

  Each of the posts 1 is constituted by the superimposition of tubular mounting modules 2 having a height h of the order of 4 m.

  s The number of four posts 21, 22, 23 and 24 chosen as

  example in Figure 1 is of course not limiting of the invention.

  According to Figure 1, the lower module 21 is fixed to a base 3 resting on the ground.

  The upper mounting module 24 is itself surlo0 mounted by a protection module 4 equipped with hooking members

ropes 5.

  The configuration of the base 3 and the attachment module 5 will be described in more detail in the remainder of this description.

  According to FIG. 2, the mounting modules 2 are all semi-flexible and have a particular section designed so as to hinder

  the escalation of escape candidates.

  The section of these mounting modules 2 is symmetrical with respect to the median longitudinal plane shown diagrammatically by the axis xx 'in the figure

  2 and has a maximum dimension 1 = 0.8 m.

  More specifically, the section of the mounting modules 2 is

  constituted by a portion of a circle 6 of radius rn = 0.5 m and by a semicircle 7 of diameter r2 = 0.2 m joined by rectilinear sections 8.

  According to Figures 3, 4 and 5, the adjoining mounting modules 2 are assembled by means of connection sleeves 9 of corresponding section which fit into these mounting modules 2 at the level

of their ends.

  According to Figures 3 and 5, the connection sleeves 9

  are fitted with threaded holes 10 coinciding with corresponding threaded holes of the mounting modules 2, not shown in the figures, in order to allow the fixing of these elements by means of bolts.

  According to FIG. 4, the connection sleeves 9 are in

  further equipped, at their middle part with a series of wedging lugs 11 projecting at their periphery.

  According to Figure 5, the wedging pins 1 1 of a sleeve 9

  are based on the edge 12 of the mounting module 21 located below.

  The presence of the wedging pins 12 thus ensures the perfect juxtaposition of the threaded holes 10 of the connection sleeves 9 and the corresponding threaded holes of the modules

mounting 2.

  According to FIGS. 6 and 7, the base 3 is constituted by a metallic fixing plate 13 of circular shape which rests on the ground at 5 the middle part of which is welded a base sleeve 14 of section

  similar to that of connection sleeves 9.

  According to Figure 7, the fixing plate 13 is provided at its periphery with a series of perforations 15 allowing its anchoring on a

foundation element.

  According to Figure 6, the base sleeve 14 is equipped on its periphery with threaded holes 16 as well as positioning shims 17 located below the holes 16 and through holes 18 drilled

  below the positioning shims 17.

  According to FIG. 8, the shims 17 make it possible to position the i5 lower mounting module 21 so that the holes fitted to it coincide exactly with the holes 16 to allow assembly

  of these two elements 14, 21 by means of bolts 19.

  In view of the fact that the lower mounting module 21 is thus kept at a certain distance from the fixing plate 20 13, the orifices 18 allow the evacuation of the condensation water.

  According to FIGS. 1, 9 and 10, the protection module 4 consists of a metallic tubular element having a section similar to that of the mounting modules but a height hi lower on the order

1.20 m.

  Not shown in the figures, this tubular element 4 is assembled to the upper mounting module 24 by a hooking sleeve 9, in a manner similar in all respects to the mode.

  for assembling the different adjoining mounting modules 2.

  Two essentially circular metal attachment plates 20, 20 are welded to the respective ends of the tubular element 4.

  According to FIG. 9, the upper attachment plate 20 is provided at its periphery with a series of perforations 22 allowing the fixing

  of a first set of ropes 51 shown diagrammatically in FIG. 1.

  According to Figures 1 and 9, the upper attachment plate is further capped with a conical tip 23 having a height of

  300 nmm and an inclination of 30 which is welded thereon.

  According to FIG. 10, the lower attachment plate 21 is also equipped at its periphery with a series of perforations 24 which allow the fixing of a second set of cables 52 shown diagrammatically on the

figure 1.

  According to FIG. 10, the lower attachment plate 21 is moreover equipped at its central part with a recess 25 of shape and dimensions corresponding to those of the attachment sleeves 9 and provided at its periphery with reservations 26 corresponding to the lugs of setting 11

of these sleeves 9.

  The lower hooking plate 21 is interposed around

  a sleeve 9 between the upper mounting module 24 and the tubular element 4.

  The presence of the reservations 6 thus allows perfect positioning of the elements 24 and 4 so as to guarantee the juxtaposition of their respective tapped holes.

  According to FIGS. 1, 11 and 12, the post 1 comprises a harrow 27 which is interposed between the mounting modules 23 and 24.

  According to FIGS. 11 and 12, this harrow 27 is constituted by a metal crown 28 having a section similar to that of the mounting modules 2 on the periphery of which anti-climbing tips 29 are fixed.

  The median orifice 30 of the crown 28 is provided at its periphery with reservations 31 corresponding to the wedging pins 11 of the connection sleeves 9.

  Furthermore and according to FIGS. 1 and 13, the mounting module 23 is equipped on its periphery with a series of members 32 allowing the

  fixing of low voltage electric cables 33.

  According to FIG. 13, these members 32 consist of fixing bars 34 fitted at their end with a porcelain support 30 for cables 35.

  The bars 34 are calculated so as to have a tensile break of 40 kg so as to prevent them from acting as

  taken for an escape candidate trying to climb pole 1.

Claims (10)

  1) helicopter anti-landing device consisting of a set of posts (1) at the top of which is hung a set of intertwined ropes (5) so as to define an essentially ho5 rizontal mesh, characterized in that each of the posts (1) consists of a series of tubular metal mounting modules (2) having an ovoid section assembled by means of connection sleeves (9) of corresponding section which fit into them at their ends and are fixed by bolts inserted in suitable threaded holes provided for this purpose on the mounting modules (2) on the one hand and on the connection sleeves (9) on the other hand, the lower mounting module (21) being fixed to a base (3) resting on the ground while the upper mounting module (24) is surmounted by a protection module (4) equipped with hooking members   of cables (20, 21) to which it is assembled by means of a connection sleeve (9).   2) Device according to claim 1, 20 characterized in that   each of the connection sleeves (9) is equipped at its central part with wedging lugs (11) projecting at its external periphery to bear on the edge of an associated mounting module (2) so as to guarantee juxtaposition threaded holes in the modules (2) and connection sleeves (9).   3) Device according to any one of claims 1 and 2,   characterized in that the base (3) is constituted by a metallic fixing plate (13) es30 substantially circular provided at its periphery with a series of perforations (15) allowing its anchoring on the ground and at its central part of a base sleeve (14) having a cross section similar to that of the   connection (9) which is welded thereto at its lower part.   4) Device according to claim 3, characterized in that the base sleeve (14) is equipped on its periphery with threaded holes (16) allowing the fixing of the lower mounting module (21), as well as positioning shims (17 ) of this module, and through holes (18) drilled below the positioning shims (17) to allow   evacuation of condensed water.   5) Device according to any one of claims 1 to 4, characterized in that   the protection module (4) is constituted by a metallic tubular element having a section similar to that of the mounting modules (2) at the upper part of which is welded a metal hooking plate 10 (20) essentially circular provided at its periphery a series of perforations (22) allowing the attachment of a first set of cables (51).   6) Device according to claim 5, characterized in that the upper attachment plate (20) is capped with a conical tip (23) welded thereon.   7) Device according to any one of claims 5 and 6,   characterized in that the protection module (4) is equipped at its lower part with a plate   metal attachment hook (21) essentially circular welded thereto and provided at its periphery with a series of perforations (24) allowing the attachment of a second set of cables (52).   8) Device according to any one of claims 1 to 7,   characterized in that it comprises at least one removable anti-climbing harrow (27)   between two adjacent mounting modules (23, 24).   9) Device according to any one of claims 1 to 8,   characterized in that at least one mounting module (23) is equipped with fixing members (32,   34, 35) of low voltage electric cables (33).   10) Device according to claim 9, characterized in that the fixing members (34) of electric cables (33) are designed to   have a tensile rupture of the order of 40 kg.