FR2545116A1 - ELEMENT SHOCK ABSORBER FOR RAILWAY - Google Patents

Abstract

A. NOISE DAMPER FOR RAILWAY TRACKS. B. TRACK ELEMENT CHARACTERIZED IN THAT PART 7 CONNECTED TO THE RAIL IS CONSTITUTED BY A CORE WITH LARGE INERTIAL MASS, AND THE PART CONNECTED TO INFRASTRUCTURE 1 IS CONSTITUTED BY A TROUGH 4 INTENDED TO RECEIVE THIS CORE. C. THE INVENTION APPLIES TO A NOISE DAMPING DEVICE FOR RAILWAY ELEMENTS, IN PARTICULAR FOR CROSSING BRIDGES OR TUNNELS.

Description

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  "Noise damper for railway".

  The present invention relates to a

  railway noise damping device for mounting between rails and their attachment and track infrastructure, consisting of a rail-connected part

  and a piece connected to the infrastructure, a layer of

  elastic medium of damping of the noise being planned

between these two pieces.

  The infrastructure for longitudinal railway bridges and traffic over short distances consists of longitudinal bridge beams and, for

  the tunnels in anchoring soles.

  In the case of track metal bridges

  the noise radiation in the air is particularly

  importantly in the frequency range from 100 to 500 Hz In known bridges, bridge sleepers

  made of wood are mounted directly on the longitudinal beams.

  However, this measure can only achieve a very low damping of the

noise in the air.

  Since, for noise damping, very large masses are required, we admit

  currently only sound radiation, on bridges

  particularly heavy, such as concrete bridges, is

  particularly favored by a continuous ballast bed.

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  For the isolation of the sound mass vibration in tunnels, it has been implemented a rail support which consists of a room connected to the ground of the tunnel on which is mounted a piece connected to the rail Between these two parts is provided a intermediate elastic layer of damping of the noise of this

  way, we obtain that the sound vibration that is trans-

  putting the rail in the part of the rail support which is connected to it is damped in the intermediate layer

elastic.

  The present invention aims to achieve

  be a piece of railway noise damper with

  which it is possible to obtain an acoustic decoupling

  particularly effective between rail and infra-

  structure of the railway This element must find its use for the reduction of the noise in metal bridges of railroads and the lanes of circulation on short distances as well as in tunnels, in particular in the tracks underground ( metro) and

  lestramways (railways of cities).

  This problem is solved according to the invention characterized in that the part which is connected to the rails is constituted by a core mass of inertia important, while the part which is connected to the infrastructure is constituted by a trough for the

reception of this nucleus.

  Thus, a noise damping track element with which the transmission of noise

  to the surrounding air can be understood, in particular

  between 100 and 500 Hz.

  It can also be used for existing bridges and for newly installed bridges. In addition, it can be used in railway types without a ballast bed with direct support of wooden sleepers on the bridge spars. that is to say in bridges to

  solid-core beam, hollow box and lattice.

  Advantageously, the core is formed by a concrete cross member with a steel casing, or a steel cross member. This means that such a crossbar has only a reduced weight. In addition, the fact that such ties can be exchanged in existing bridges against wooden sleepers In addition, they

  are considerably lighter than a mass-

  They are also lighter than absorbers

  In addition to this, there is the advantage of an ease of exchange against bridge sleepers.

existing bridges.

  The service durability of such

  its is identical to that of track rails on bridges

  and in tunnels In addition the track element is parti-

  highly resistant to corrosion.

  According to one embodiment of the invention

  It is envisaged that the trough and the damping intermediate layer of the sound will be located only in the field of rails. The core may be made as a continuous cross-member which consists of a hollow profile filled with concrete. The mass of inertia may be increased by realizing cast iron or concrete core with insertion

of ballast.

  It is further recommended to maintain

  crosses it into its trough by means of a hand

  down, with, between this organ and the trough,

  also an elastic intermediate layer of damping

noise.

  In addition, the track element can be mounted in the longitudinal direction of the rails, and it is possible to provide two opposite track elements interconnected by the concrete crossbar embedded in

a steel envelope.

  Advantageously, the track elements are 4. arranged, in the case of use for the bridges, on the

bridge spars.

  According to another embodiment of the invention

  In the case of the use of track elements in tunnels, the space between the cross-member and the upper edge of the rail and the space between the cross-member and the tunnel floor may be filled with hollow sections. In this way, the track element, with the same principle, obtains a mass of inertia greater than that required on bridges. Thus, it achieves a very marked reduction in the emission of sound vibrations of mass in a frequency domain

from 10 to 25 Hz.

  The invention is explained below with the aid of three examples shown in the accompanying drawings, in which: FIG. 1 is an elevational view,

  partially in section, of the rail element.

FIG. 2 is a plan view of

the track element of Figure 1.

  FIG. 3 is a sectional view through

III-III of Figure 1.

  FIG. 4 is a plan view of a

second embodiment.

  FIG. 5 is a sectional view through

V-V of Figure 4.

  FIG. 6 is a plan view of a

third embodiment.

  FIG. 7 is a sectional view through

VII-VII of Figure 6.

  In Figures 1 to 3, there is shown a

  noise damping track element according to a first

  first embodiment of the invention, which is

  designed for use on track metal bridges

  railways and associated traffic lanes

  1, is disposed a trough 4, with interposition of fur sheets 2 and 3 This trough is

  internally coated with an elastic intermediate layer

  In the interior of the trough 4 covered with the elastic inner intermediate layer 5, there is supported a cross-member 6 which is constituted by a hollow steel section 7 filled with a mass of concrete. 6 is maintained against a fall towards the outside of the trough 4 by two holding down members 9 and 10 The holding member 10 is constituted

  by a leaf spring 11 which is connected to the trough 4 by the in-

  intermediate eyecups 12 and 13 Between the leaf spring Il and the trough 4 and the hollow profile 7 is provided an elastic intermediate layer damping noise

14.

  The other holding member 9 downwards is constituted in the same way as the holding member A leaf spring 15 is connected to the trough, at each

  of its ends by rings 16 and 17 between the

  fate 15 and the hollow section 7 is provided with a

  noise damping elastic intermediary 18.

  On the hollow profile 7, is welded a plate provided with ribs 19 on which is fixed a

  rail 20 by means of bolts 21 and 22.

  In the case of the exemplary embodiment shown in FIGS. 4 and 5, the track element

  noise absorber is arranged in a longitudinal direction

  20 A trough 23, mounted in a non-rigid manner

  shown on a bridge spar, is covered

  an elastic intermediate layer damped

  This intermediate layer 24 is provided with a hollow section 25 provided with a concrete filling 26. The hollow section 25 forms, in common with

the filling 26, the crossbar 27.

  On the hollow profile 25 is arranged, by

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  by means of a noise-damping layer 28, a downward-holding member constituted by a spring 29, which ends at each end by an eyelet 30 and 31 hooks 32 and 33 are fixed on the trough 23 in 30 and 31 between the eyecup and the hook 32 A splice ring 34 is mounted between the eyecup and the hook 32, and between the eyecup 31 and the hook 33 is mounted a splint ring 35 The part of the track element noise damper located in front of the transom consists of

  the manner previously described.

  On the hollow profile 25 and on a ribbed plate 36, the rail 20 is fixed by means of bolts 21 and 22. The sound damping track element

  shown in Figures 6 and 7 is intended for special

  to tunnel sleepers As in the examples

  previous, a trough 23 is planned here, coated inside-

  an intermediate damping layer 24 and in which is supported a crossbar 27 which consists of a hollow section filled with a load 26 of concrete In order to introduce the very large mass of inertia necessary to damp mass vibration noise emission in the frequency range from 10 to Hz, the free space between the cross member 27 and the

  upper edge of the rail 20 is filled with another

  hollow filament 37 provided with a concrete filling 36 In addition, the free space between the cross member 27 and the floor of the tunnel is filled with another profile

  hollow 39 filled with a load of concrete 40.

Claims (3)

CLAIMATIA 0 NS) A sound-absorbing railroad track element for its mounting between a rail and its cross-beam attachment as well as the track infrastructure, consisting of a rail-connected part and a connecting part to the track. infrastructure, an elastic intermediate layer of noise damping being provided between these two parts, track element characterized in that the portion (7, 27) connected to the rail is constituted by a core with a large mass of inertia, and the part connected to the infrastructure (1) is constituted by a trough (4, 23) intended to receive this core.   2) noise damping track element, according to claim 1, characterized in that the core is constituted by a concrete crossbar (7, 27) embedded in a steel casing, or by a cross member in steel.   ) Sound damping track element,   according to one of claims 1 or 2, characterized in   the trough (4, 23) and the intermediate layer of amorphous   noise (5, 24) is only found in the rail area (20).   ) Sound damping track element,   according to any of claims 1 to 3, characterized   characterized in that the core is constituted as a continuous cross-member (6), formed as a hollow section (7, 25) filled with concrete.    ) Sound damping track element,   according to any of claims 1 to 4, characterized   in that the cross member (6) is held in the trough (4, 23) by means of a downward holding member (9, 29), a resilient intermediate layer of the sound absorber (14, 18, 28) being also provided between this   holding member down (9, 10) and trough (4, 23).   6) Noise damping track element,   according to any one of claims 1 to 5, characterized   risé in that are provided two facing track elements, which are joined together by the concrete sleeper (27) with metal shell.   70) Noise damping track element,   according to any of claims 1 to 6, characterized   in that the track elements are   their use in bridges, on the spars (1) of sup- bridge port.   8) Noise damping track element,   according to any one of claims 1 to 7, characterized   in the case of use in tunnels, the free space between the cross-member (27) and the upper edge of the rail, and the space between the cross-member (27) and the tunnel floor are filled with   hollow sections (37, 38; 39, 40) filled with concrete.