CN111155417A

CN111155417A - Beam falling prevention device based on paper folding and rebounding mechanism

Info

Publication number: CN111155417A
Application number: CN201911405513.XA
Authority: CN
Inventors: 张鹤; 王莉; 田钦; 张晨辉
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-05-15
Anticipated expiration: 2039-12-30
Also published as: CN111155417B

Abstract

The invention discloses a beam falling prevention device based on a paper folding rebound mechanism, which comprises a steel stop block upper bottom plate, a steel stop block upper part, a steel stop block lower bottom plate and a paper folding rebound mechanism arranged between the steel stop block upper part and the steel stop block lower part, wherein the steel stop block upper bottom plate is fixed with the lower bottom surface of a bridge; the paper folding resilience mechanism comprises a sleeve, a paper folding type structure and a composite material plate, the sleeve is fixed on the inner side of the upper part of the steel stop block, and when the paper folding resilience mechanism is extruded by the lower part of the steel stop block along the bridge direction, the paper folding resilience mechanism can generate compression deformation along the direction and generate resilience force at the same time. The deformation of the paper folding resilience mechanism is used for absorbing seismic energy so as to relieve the impact of the seismic action on the beam and the stop block and enable the beam to reset after the horizontal action is finished.

Description

Beam falling prevention device based on paper folding and rebounding mechanism

Technical Field

The invention relates to the technical field of anti-falling beams for bridges, in particular to an anti-falling beam device based on a paper folding rebounding mechanism.

Background

With the development of traffic infrastructure construction, the viaduct plays an important role in modern traffic networks. However, under the action of strong shock, when the upper and lower structures of the bridge are displaced too much, collision between beams or between beams and a platform and damage of the support can occur. After the support is damaged, the bridge body is easy to displace along the bridge direction, which causes the falling of the bridge and the earthquake damage, and leads to the paralysis and the huge loss of the traffic network. Therefore, a precaution against the earthquake damage of the falling beam is necessary.

At present, a stop block is an anti-seismic construction measure frequently adopted in bridge design, and is usually arranged on the top surface of a lower structure of a bridge or the bottom surface of an upper structure of the bridge and used for limiting overlarge displacement between the upper structure and the lower structure of the bridge so as to reduce collision and beam falling damage of the bridge under the action of an earthquake. However, the traditional reinforced concrete block is often damaged in the earthquake process, so that the traditional reinforced concrete block is sheared or broken, and the anti-seismic form is that the beam and the block are directly collided, so that the energy consumption capability is not provided, and the traditional reinforced concrete block is difficult to repair.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a beam falling prevention device based on a paper folding rebounding mechanism, the paper folding rebounding mechanism is introduced to optimize the structure of the existing stop block, the energy consumption capability is higher, the collision between a beam and the stop block can be effectively reduced, the buffering effect is realized, and the beam falling damage is prevented.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a girder falling prevention device based on a paper folding rebound mechanism comprises a steel stop block upper bottom plate, a steel stop block upper part, a steel stop block lower bottom plate and a paper folding rebound mechanism arranged between the steel stop block upper part and the steel stop block lower part, wherein the steel stop block upper bottom plate is fixed with the lower bottom surface of a bridge;

the paper folding rebounding mechanism comprises a sleeve, a paper folding structure and a composite material plate, the sleeve is fixed on the inner side of the upper part of the steel stop block, one end of the paper folding structure is fixed with the inner surface of the sleeve, and the other end of the paper folding structure is fixed with the composite material plate; when the paper folding resilience mechanism is extruded by the lower part of the steel stop block along the bridge direction, compression deformation can be generated along the direction, and resilience force is generated at the same time.

Further, the paper folding type structure comprises a gap structure, and the gap structure is realized by inwards folding the top point of the paper folding type structure, so that the number of paper folding creases is increased, and the rigidity and resilience performance of the paper folding type structure are increased.

Furthermore, the paper folding structure comprises two types of vertexes which are respectively convex vertexes protruding outwards and concave vertexes recessed inwards, the convex vertexes and the concave vertexes are arranged in a staggered mode, three of the four creases extending from a certain vertex are in the same category, the other crease is in the opposite category, for the convex vertexes, the three creases in the same category are folding ridges, the other crease is folding valleys, in four areas divided by the four creases, the angle of the area corresponding to the smaller angle is α, the angle corresponding to the larger angle is 180- α, for the concave vertex, the three creases in the same category are folding valleys, the other crease is folding ridges, in the four areas divided by the four creases, the angle of the area corresponding to the smaller angle is β, the angle corresponding to the larger angle is 180- β, α and β are both acute angles, and α is greater than β.

Furthermore, the inside of the paper folding rebound mechanism is filled with fillers.

Further, the filler is a viscous fluid energy absorbing material.

The beneficial effect of the invention is that,

(1) according to the anti-beam-falling device based on the paper folding rebounding mechanism, due to the design of the paper folding rebounding mechanism, the earthquake energy is absorbed through the deformation of the paper folding rebounding mechanism, the impact action of the earthquake action on the bridge and the stop block is relieved, and the paper folding rebounding mechanism has good rebounding performance and has buffering and anti-seismic effects on external force;

(2) the paper folding rebounding mechanism further comprises a gap structure, the rebounding performance of the paper folding rebounding mechanism can be improved by increasing the number of the folding marks, the structural rigidity is improved, and the requirement of bridge earthquake resistance is met.

Drawings

Fig. 1 is a bridge elevation.

Fig. 2 is a schematic view of the present invention installed at a in fig. 1.

Fig. 3 is a schematic structural diagram of the present invention.

Fig. 4 is a schematic view of the state of the bridge pier in the forward movement of the bridge.

FIG. 5 is a diagram of a paper-based model of the present invention.

FIG. 6 is a plan fold view of the present invention, wherein solid lines represent ridges and dashed lines represent valleys, the same below.

Fig. 7 is a detailed view of the convex apex element and the concave apex element of the present invention.

Figure 8 is a detailed view of the gap structure fold.

Reference numbers in the figures: 1-a bridge; 2-fixing a support; 3-a sliding support; 4-bridge pier; 5-the ground; 6-steel corbel; 7-a beam falling prevention device based on the paper folding rebound mechanism; 71-steel dog upper base plate; 72-upper portion of steel stop; 73-a paper folding rebounding mechanism; 74-lower portion of steel stop; 75-steel stop block lower bottom plate; 731-sleeve; 732-paper-folded type structures; 733-high strength high durability composite board.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the invention will become more apparent. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 is a bridge elevation view, and the anti-falling beam device based on the paper folding and rebounding mechanism is installed at a bridge elevation A, and an enlarged view of A is shown in fig. 2.

The invention discloses a beam falling prevention device 7 based on a paper folding rebound mechanism, which comprises a steel stop upper bottom plate 71, a steel stop upper part 72, a steel stop lower part 74, a steel stop lower bottom plate 75 and a paper folding rebound mechanism 73 arranged between the steel stop upper part 72 and the steel stop lower part 74, wherein the steel stop upper bottom plate 71 is fixed with the lower bottom surface of a bridge 1, the steel stop upper part 72 is fixed with the steel stop upper bottom plate 71, the steel stop lower part 74 is fixed with the steel stop lower bottom plate 75, and the steel stop lower bottom plate 75 is fixed with the top surface of a steel corbel 6;

the paper folding resilience mechanism 73 comprises a sleeve 731, a paper folding type structure 732 and a composite plate 733, the sleeve 731 is fixed on the inner side of the upper part 72 of the steel stopper, one end of the paper folding type structure 732 is fixed with the inner surface of the sleeve 731, and the other end is fixed with the composite plate 733.

As shown in fig. 4, when the pier 1 moves along the bridge direction (moves leftwards or rightwards) under the action of an earthquake, the lower portion 74 of the steel stopper moves along the bridge direction to collide with the high-strength high-durability composite plate 733, and the paper folding resilience mechanism 73 receives the impact force transmitted by the high-strength high-durability composite plate 733, so that the paper folding structure 732 is compressed to generate the resilience force, thereby effectively reducing the collision between the beam and the stopper and playing a role in buffering.

As shown in fig. 5, the paper-based model of the paper folding resilient mechanism 73 is formed by folding a planar material according to a specifically designed fold, and specifically, the planar fold is shown in fig. 6, except for the edge, a solid line represents a fold, that is, the fold is upwardly convex and takes the shape of a ridge after being folded, and a dotted line represents a valley, that is, the fold is downwardly concave and takes the shape of a valley after being folded. It is noted that the ridges are opposite the valleys, the folds of the ridges being the valleys on the other side when viewed from one side, where the ridges and valleys are defined as facing the outer surface of the origami-type structure.

The folding and unfolding operations of the paper folding type structure are reversible, and included angles formed by all the intersecting crease marks are kept unchanged in the unfolding and folding processes; the dihedral angle formed by the planes on both sides of the fold changes during folding and unfolding, and when the dihedral angle is 0 degrees, the cylindrical rebound mechanism is completely folded, and when the dihedral angle is 180 degrees, the cylindrical rebound mechanism is completely unfolded.

The paper folding springback mechanism 73 is provided with two types of vertexes which are respectively an outward convex vertex and an inward concave vertex, the convex vertex and the concave vertex are arranged in a staggered mode, the unit detail of the two types of vertexes is shown in figure 7, three of four creases extending from a certain vertex are in the same type, the other crease is in a relative type, the three creases in the same type are folding ridges, the other crease is folding valleys, the angle of a corresponding area with a smaller angle is α and the angle of a corresponding area with a larger angle is 180- α in four areas divided by the four creases, the three creases in the same type are folding valleys and the other folding ridge in the concave vertex, the angle of the corresponding area with a smaller angle is β and the angle of the corresponding area with a larger angle is 180- β, α and β are acute angles, and α is larger than β.

The paper folding type structure in the paper folding resilience structure is also provided with a gap structure, the gap structure is a small area structure added on the convex top point and the concave top point of the paper folding structure, the crease pattern is shown in figure 8, the gap structure is realized by inwards folding the top point of the cylinder paper folding resilience mechanism, the resilience performance of the structure is improved by increasing the number of the creases, and the structure rigidity is adjusted.

In order to increase the energy absorption effect of the beam falling prevention device, fillers such as viscous fluid energy absorption materials can be filled in the paper folding resilience mechanism, and the viscous fluid energy absorption materials as the fillers have very obvious impact resistance and can better disperse and absorb the kinetic energy of impact.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.

Claims

1. A beam falling prevention device based on a paper folding rebound mechanism is characterized by comprising a steel stop block upper bottom plate, a steel stop block upper part, a steel stop block lower bottom plate and the paper folding rebound mechanism arranged between the steel stop block upper part and the steel stop block lower part, wherein the steel stop block upper bottom plate is fixed with the lower bottom surface of a bridge;

2. The beam falling prevention device based on the paper folding resilience mechanism is characterized in that the paper folding type structure comprises a gap structure, and the gap structure is realized by folding the top point of the paper folding type structure inwards, so that the number of paper folding creases is increased, and the rigidity and the resilience performance of the paper folding type structure are increased.

3. The beam falling prevention device based on the paper folding rebounding mechanism is characterized in that two types of vertexes are arranged in the paper folding type structure, namely convex vertexes protruding outwards and concave vertexes recessed inwards, the convex vertexes and the concave vertexes are arranged in a staggered mode, three of four creases extending from a certain vertex are in the same class, the other crease is in a relative class, for the convex vertexes, the three creases in the same class are folded ridges, the other crease is folded valleys, the angle of a corresponding area with a smaller angle is α, the angle of a corresponding area with a larger angle is 180- α, for the concave vertexes, the three creases in the same class are folded valleys, the other crease is folded ridges, the angle of a corresponding area with a smaller angle is β, the angle of a corresponding area with a larger angle is 180- β, α and β are both acute angles, and α is more than β.

4. The beam falling prevention device based on the paper folding rebounding mechanism is characterized in that the paper folding rebounding mechanism is filled with filler.

5. The beam falling prevention device based on the paper folding rebounding mechanism is characterized in that the filler is a viscous fluid energy absorption material.