Bat enclosure tunnel Forst and Hirsau

In the two existing tunnels "Forst" and "Hirsau"

Reopening of the Weil der Stadt - Calw section as Hermann

Hesse Railway built a protective device for the bats living there

become. For this purpose, a continuous separation is to be installed in the tunnels.

in order to spatially separate the "railway chamber" from a future "bat chamber". This separation is carried out by a steel construction with full-surface infill by aluminium elements, as is common in noise barrier constructions. The separation of the railway chamber from the bat chamber is to be carried out with field-tested constructions, which are both approved for use in the railway sector and can be adapted inexpensively to the requirements of the chamber design.

The inner shell of the Forst tunnel consists of red sandstone masonry with more

or less existing grouting. In some areas, there are repair points with

Brick masonry or shotcrete. The blocks jump at the joints in height,

to achieve the tunnel longitudinal inclination of approx. 1%. The rift valley area is at

of the tunnel shell is currently not conspicuous, but will be renovated before installation of the partition wall

and reinforced.

The inner shell of the Hirsau tunnel is also made of red sandstone masonry

with more or less existing grouting. Opposite the Forst Tunnel

sanding of the stones generally predominates. In places,

Repair sites with brick masonry or shotcrete. The tunnel has about 1.5

- 1.7% has a greater longitudinal slope than the Forst tunnel, but the block joints are

Manufactured according to plan without jumps. Immediately in front of the eastern tunnel portal

of the tunnel Forst is the cross-section of the cut through an approx. 29 m long niche

widened by approx. 3 m on the right side of the track. In this niche there is a

Pump house of the municipality of Althengstett, whose rear side of the securing of the

Cutting embankment, as well as a non-traffic-safe stair access from the

Landesstraße 183 at the embankment head.

The rehabilitation of the two tunnels has already been completed and therefore not

Subject of the measure described herein.

Excavation approx. 2,600 m³

Produce foundations approx. 860 m3

Micropiles approx. 320 pcs

Wiederauffüllung ca. 1,650 m³

Steel construction approx. 1,350 t

Lärmschutzelemente ca. 12,000 m²

Trapezblecheindeckung ca. 2,000 m²

Over-netting open enclosure approx. 4,500 m²