Self-adaptive embedded channel of cylindrical surface in railway contact network tunnel

Abstract

The invention discloses a self-adaptive embedded channel of a cylindrical surface in a railway contact network tunnel. The self-adaptive embedded channel comprises a special-shaped steel channel and heart-shaped bolts, wherein the special-shaped steel channel is embedded in the inner wall of the tunnel along the longitudinal direction of a line; the heart-shaped bolts are arranged in the special-shaped steel channel at intervals along the longitudinal direction of the line; the special-shaped steel channel is fixed on the inner wall of the tunnel through an anchor rod; the heart-shaped bolts are arranged in the special-shaped steel channel through tenons; the tenons are matched with tooth grooves in the side wall of the special-shaped steel channel; and the head parts of the heart-shaped bolts are in arc surface contact with the tenons and the special-shaped steel channel. The self-adaptive embedded channel is simple in structure and more reasonable in stress, the stress concentration phenomenon of the structure is eliminated, the fatigue load bearing capacity is enhanced, and the service life is longer.

Description

technical field [0001] The invention belongs to the technical field of tunnel components, and in particular relates to a cylindrical self-adaptive pre-buried channel in a railway catenary tunnel. Background technique [0002] The pre-buried channel is a device used to fix the external surface of the main structure (cables, brackets, drainage pipes and evacuation platforms, etc.), and it is widely used in railway tunnels. At present, the pre-embedded channel structures used in railway tunnels basically adopt the section recommended in TB / T3329-2013 "Cylindrical Adaptive Embedded Channels in Electrified Railway Catenary Tunnels" (in the above standards figure 1 ), size (Table 1 in the above standard), material (5.2 in the above standard) and related technical conditions. The channel structure recommended in this standard is a relatively classic structure, but this structure also has the following disadvantages: (1) When the profile of this structure is stressed, there is a pa...

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Problems solved by technology

The channel structure recommended in this standard is a relatively classic structure, but this structure also has the following disadvantages: (1) When the profile of this structure is stressed, there is a particularly obvious stress concentration, which leads to fatigue of the structure When loaded, it is easy to fatigue and fail, which affects the safety of the structure. Due to the existence of stress concentration, only high-strength steel can be selected for the embedded channel, and materials with lower anti-corrosion requirements and slightly poorer mechanical properties ( Such as aluminum alloy) is difficult to get the application

(2) In order to resist the axial force along the groove, the groove needs to be designed to resist the axial sliding structure of the groove. The method adopted in this standard is to process the tooth groove inside the special-shaped steel. Due to the limitation of the structure, the tooth groove The processing is very complicated

(3) Due to the limitation of the channel and the bolt structure, the bolt cannot rotate freely in the channel. When the position of the attached component to be installed deviates, the bolt cannot satisfy a good fixing effect

(4) Due to the flat contact between the channel and the concrete, in order to have a stable connection between the channel and the concrete, the amount of anchor bars used is relatively large (anchor bar spacing ≤ 250mm)

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