Changeable retractor device for railroad bridge

Abstract

The invention discloses a changeable retractor device for a railroad bridge. A waterproof ribbon can be conveniently changed under a track base plate or a track bed under the condition of keeping normal use of a top track structure. The device comprises a pair of connection strips (20) fixed on two side walls of a contraction joint (60) via an anchorage member (40) and a waterproof ribbon (10) with two edges connected with the connection strips (20), wherein the connection strips (20) are provided with anchorage grooves (21) stretching towards a full length direction. Downward convex anchorage location bosses (11) are arranged at two edges of the waterproof ribbon (10), and the section shapes of the anchorage location bosses (11) are matched with the section shapes of lower grooves (21a) of the anchorage grooves (21); two edges of the waterproof ribbon (10) are pulled into the anchorage grooves (21) from the longitudinal ends of the connection strips (20); and a lock strip (30) is pressed in a gap between the upper surface of the waterproof ribbon (10) and the tops of the anchorage grooves (21) so that the waterproof ribbon (10) is in anchored connection with the connection strips (20).

Description

Technical field [0001] The invention relates to a railway bridge, in particular to a replaceable expansion device for expansion joints between beam bodies of railway bridges. Background technique [0002] Railway is the main artery of the national economy, and railway transportation has always served the society and the people. With the rapid development of the national economy, the state has given railway transportation more arduous tasks and higher standards. So far, China's existing railway operating mileage has reached 91,000 kilometers, and there are about 50,000 bridges over 4,000 kilometers. In newly-built railways, the total length of bridges accounts for an increasing proportion of the total line length. For example, the total length of the Beijing-Tianjin intercity railway bridge accounts for about 88% of the total line length, and the total length of the Beijing-Shanghai high-speed railway bridge accounts for about 81% of the total line length. Except for a small nu...

AI Technical Summary

Problems solved by technology

During installation, the anchor ends on both sides of the waterproof belt need to be squeezed into the anchor grooves of the metal connecting strips of special profiles. The installation is very difficult, time-consuming and laborious, and the installation quality is not easy to be guaranteed.

At the same time, after it is installed in place, the waterproof belt cannot be removed from the metal connecting strip of the profiled material, and the waterproof belt cannot be replaced after it is damaged or its service life expires

[0006] Also just started, its technology is not mature enough

The simple-supported box girder telescopic devices of various passenger dedicated lines currently under construction mainly use the telescopic devices and other similar products matched with the "Common Span Beam Bridge Deck Auxiliary Facilities for Railways" [Tongqiao 20088388]. According to the investigation, these products have the following problems: It works normally when the gap is narrowed, but it is very easy to slip and leak when the beam gap is enlarged, especially when the temperature is low; the waterproof system is not easy to install due to the small clamping force, the waterproof belt falls off seriously, and the waterproof effect is poor; at the same time, After all kinds of waterproof belts fall off, it is difficult to restore them in place again; when damaged, it is more difficult to replace or the track bed needs to be cleared when replacing, which has a great impact on railway traffic and has serious deficiencies

According to the above requirements, the normal design service life of the waterproof belt of the expansion device of the general railway bridge is about 20 years, while the design life of the bridge is 100 years, and there is a situation of serious inconsistency in durability. Requires multiple replacements, each with a direct cost of more than 5 times the initial installation excluding losses to railway operations due to waterproofing replacement

Especially for the continuous track substrate bridge deck structure, it is even more difficult to repair and replace the waterproof belt

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