Sound protection device for railroad track system

Details Sound protection device for railroad track system Sound protection device for railroad track system

1999-07-02

2000-09-05

Ip, Paul

Acoustics

Sound-modifying means

Sound absorbing fence or screen

181285, 181286, 181290, 181293, 181294, 244114B, 105452, B64F 126

Patent

active

06112849&

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a sound protection device for reducing the propagation of airborne sound, comprising a track system and an elastically deformable, low-sound protection wall made of rubber or plastic and extending in the longitudinal direction of the track, whereby the low-sound protection wall, which is arranged with a spacing from the track, has a profile on its side facing the track (innef side) which substantially extends across the entire height of the wall, whereas its side facing away from the track (outer side) has a generally even surface (DE-A-44 34 269).
2. The Prior Art
Higher requirements with respect to sound protection in connection with track installations make it necessary that the sound protection walls are installed closer to the tracks and thus to the light space profile, or project into the latter. In this connection, a sound protection wall is expected to satisfy two different requirements. On the one hand, the sound protection wall as a sound screen is expected to interrupt the sight connection from the site of emission to the site of introduction, and to permit the highest possible diffraction edge. On the other hand, the airborne sound impacting on the side of the site of emission is expected to be absorbed as effectively as possible, or to be reflected in such a way that the airborne sound is absorbed in some other way.


SUMMARY OF THE INVENTION

Now, against the background of the requirements specified above, the aim of the invention is to provide a low-sound protection wall that is designed in such a way that no vehicle material is damaged in the event of any collision. Furthermore, the function of the low-sound protection wall is expected not to be substantially reduced even in the event minor damage is caused.
Now, the low-sound protection wall as defined by the invention is characterized in that side at an angle .beta., in each case based on the vertical of the track, whereby angle .beta. is greater than angle .alpha.; towards the floor of the track at an angle .gamma., namely based on the horizontal of the track; outer side run up to each other, is terminated by a lip inclined toward the track, said lip pointing upwardly at an angle .delta. based on the vertical of the track; and that the longitudinal direction of the track.
The following angle ranges usefully apply with respect to angles .alpha., .beta., .gamma., and .delta.:
The advantageous materials or material parameters are specified as follows:


______________________________________ Material EPDM, SBR, BR, or their mixtures Shore hardness "A" 55-80.degree. Tearing strength .gtoreq.11 N/mm.sup.2 Elongation limit .gtoreq.300% Rebound elasticity .gtoreq.25% (at RT) Residual pressure deformation (72 h/RT) .ltoreq.35% Abrasion .ltoreq.450 mm.sup.3. ______________________________________
Furthermore, the material of the low-sound protection wall should have a high loss factor (d=0.08 to 0.4) as compared to concrete and steel.


BRIEF DESCRIPTION OF THE DRAWINGS

Now, the invention is explained in the following with the help of an exemplified embodiment and by reference to a schematic drawing, whereby the following list of reference numerals and symbols applies in connection with said drawing: .delta.


DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The inner side 6 of the low-sound protection wall 5 has an inclination angle .alpha. in particular of 5.degree. to 10.degree. based on vertical X of the track. Furthermore, said inner side is terminated at the top by a lip 9 which is inclined to track 1, and which points upwardly, whereby the inclination angle .delta. particularly amounts to 30.degree. to 45.degree. also based on vertical X of the track. Due to the angle constellations according to .alpha. and .delta., the airborne sound emitted by the wheel and the track is optimally reflected to track floor 4.
Furthermore, the inner side 6 of low-sound protection wall 5 is provided with a plurality of lips 8 pointing a

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patent: 6016888 (2000-01-01), Lynn

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