Long-span anti-impact multidirectional displacing comb-shaped plate type bridge stretching device

Abstract

The invention relates to a long-span anti-impact multidirectional displacing comb-shaped plate type bridge stretching device which comprises a comb tooth plate mechanism and a stretching mechanism fixed at the lower end of the comb tooth plate mechanism, wherein the comb tooth plate mechanism and the stretching mechanism are both fixedly connected with an embedded structure in the bridge end; the comb tooth plate mechanism comprises a fixed comb tooth plate and a moveable comb tooth plate; horizontal sliding steel plates are respectively arranged at the bottoms of the fixed comb tooth plate and the moveable comb tooth plate; the two horizontal sliding steel plates are up and down overlapped and are in sliding fit with each other; the stretching mechanism comprises two displacement boxes which are respectively fixed under the fixed comb tooth plate and the moveable comb tooth plate; a sliding mechanism is arranged between the two displacement boxes; the sliding mechanism comprises cross beams which are respectively arranged on the inner sides of the displacement boxes; a rotating sleeve is arranged between the two cross beams; hinges are jointed between the rotating sleeve and the displacement boxes; a prepressed elastic support base is arranged between the rotating sleeve and the horizontal sliding steel plate in the lower layer. The stretching device has an excellent waterproof and dustproof property, can prevent the comb tooth plate from warping and deforming, is suitable for long-span and high-impact occasions and has a multidirectional displacing function.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a large-span impact-resistant multi-directional displacement comb-shaped plate bridge telescopic device. Background technique [0002] With the gradual development of bridges in our country, the modular bridge expansion devices are also imported from Europe and the United States. The format device is still widely used because of its large longitudinal displacement and convenient installation. However, due to its structural and performance defects, many serious image damages have occurred in domestic and foreign projects that have been used, and lead to Major traffic accidents, the common problems in the use of the modular bridge expansion device mainly include the following points: 1) The modular expansion device is an integral structure, and the center girder steel is arranged in full length, equal to the width of the bridge deck, Once the center beam st...

AI Technical Summary

Problems solved by technology

During its use, there are mainly the following problems: 1) When the horizontal rotation occurs, the comb teeth twist and shear, which will cause the bolts to loosen or the comb teeth to break, or when the beam body bears the load, vertical deflection occurs, and the gap between the device and the beam body A large pulling force is formed to cause the bolts to loosen and fall off. When frequent loads and vibrations act on the device, it is very easy to cause the device to bend and deform, and the comb teeth to break, resulting in traffic accidents; 2) The long-term action of the vehicle leads to fatigue of the bolts anchoring the comb plate If it stretches, there will be a gap between the comb plate and the end of the bridge. After long-term use, garbage and other objects will enter the gap, and the comb plate will not be able to return to its original position, causing the comb plate to warp, seriously affecting driving safety.

[0004] In order to improve the use effect of the ordinary comb-tooth plate bridge expansion device, the comb-tooth plate bridge expansion device in the prior art is improved to a bolt unit multi-directional displacement comb-shaped plate expansion device, which includes a movable comb plate and a fixed comb There is a stainless steel plate under the comb plate, and a vertical displacement shaft is arranged horizontally under the end of the movable comb plate; fixed bolts are installed at the end of the fixed comb plate. It has been improved, but there are still deficiencies, that is, it is difficult to meet the horizontal rotation under the condition of lateral force, especially when the resultant force torsion occurs in the longitudinal, lateral and vertical directions at the same time, it cannot meet the requirements of use, resulting in damage to the device. The end of the movable plate is provided with a horizontal rotating shaft that can meet the vertical rotation, and the upper and lower supports are used to clamp the rotating shaft. When the beam bears the load, the vertical rotation occurs through the rotating shaft.

From the formal point of view, the device seems to be able to achieve vertical rotation, but there are actually certain design defects, that is, the separation of the rotating system and the concrete is not realized, so that the rotating shaft is firmly wrapped by the concrete and cannot rotate, resulting in the peeling of the concrete wrapped on the surface of the rotating shaft. Bolts break off, causing damage to the unit

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