CN114232465B - Girder falling prevention device for box girder bridge - Google Patents
Girder falling prevention device for box girder bridge Download PDFInfo
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- CN114232465B CN114232465B CN202210040257.4A CN202210040257A CN114232465B CN 114232465 B CN114232465 B CN 114232465B CN 202210040257 A CN202210040257 A CN 202210040257A CN 114232465 B CN114232465 B CN 114232465B
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- 230000002265 prevention Effects 0.000 title claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims description 10
- 230000003139 buffering effect Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
- F16F15/0232—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means with at least one gas spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to the technical field of bridge engineering, in particular to a box girder bridge falling prevention device, which comprises a support, a middle girder and a connecting device, wherein the middle girder is arranged between two adjacent box girders and fixedly connected with the support; the connecting device comprises a stand column, a connecting piece, a movable supporting column, a guide seat and a limit column, wherein the lower end of the stand column is rotationally connected with a support, the guide seat is arranged on the bottom surface of a top plate of the box girder, an arc-shaped groove is formed in the upper surface of the support, the lower end of the movable supporting column is in sliding connection with the arc-shaped groove, and the upper end of the movable supporting column is fixedly connected with a guide block; one end of the connecting piece is fixedly connected with the upright post, and the other end of the connecting piece is rotationally connected with the movable supporting column; the bottom plate of case roof beam is last to set up spacing hole, sets up the fixed orifices on the support, and the lower extreme and the fixed orifices sliding fit of spacing post, the middle part fixed connection disc of spacing post, the bottom plate of case roof beam place in on the disc. The invention can effectively buffer the movement of the box girder and prevent the box girder from falling down when an earthquake occurs.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a girder falling prevention device of a box girder bridge.
Background
The box girder of the reinforced concrete structure is divided into a prefabricated box girder and a cast-in-situ box girder. The box girder combined bridge girder erection machine prefabricated in the independent place can be erected after the lower engineering is completed, so that the engineering progress can be accelerated, and the construction period can be saved; cast-in-situ box girders are mostly used for large continuous bridges. The box girder is connected with the bridge pier through the supports at two sides, if the supports are damaged under the action of special loads such as earthquake, the box girder can be transversely or longitudinally displaced, and therefore disasters such as inclination of the bridge deck and deviation of the box girder are caused.
Disclosure of Invention
The invention aims to provide a girder falling prevention device for a girder bridge, which aims to solve the technical problem of girder falling caused by displacement of a girder.
In order to achieve the above purpose, the basic scheme of the invention is as follows:
the utility model provides a roof beam device falls in roof beam bridge which characterized in that: the bridge pier comprises a support, a middle beam and a connecting device, wherein the support is arranged at the top of a bridge pier and fixedly connected with the bridge pier, the middle beam is arranged on the support and fixedly connected with the support, and the middle beam is arranged between two adjacent box beams;
the connecting device comprises a stand column, a connecting piece, a movable supporting column, a guide seat and a limiting column, wherein the stand column is vertically arranged in the middle beam, the lower end of the stand column downwards penetrates through the bottom plate of the middle beam and is inserted into the support to be rotationally connected with the support, and the upper end of the stand column is rotationally connected with the top plate of the middle beam;
the guide seat is arranged on the bottom surface of the top plate of the box girder and is rotationally connected with the box girder, the lower surface of the guide seat is horizontally provided with a through groove, and the bottom surface of the through groove is provided with an inclined surface which is inclined downwards from the middle part of the through groove to the two ends of the through groove;
the upper surface of the support is provided with an arc-shaped groove, the circle center of the arc-shaped groove is positioned on the axis of the upright post, a notch is formed in the area corresponding to the arc-shaped groove on the bottom plate of the box girder, the movable support column is vertically arranged, the lower end of the movable support column is positioned in the arc-shaped groove and is in sliding connection with the arc-shaped groove, and the upper end of the movable support column is fixedly connected with a guide block matched with the through groove of the guide seat;
the connecting piece is horizontally arranged, one end of the connecting piece is fixedly connected with the upright post, and the other end of the connecting piece is sleeved outside the movable supporting column and is in rotary connection with the movable supporting column;
the bottom plate of box girder sets up spacing hole on, spacing hole vertically runs through the bottom plate of box girder, vertical set up on the support with the fixed orifices that the spacing hole corresponds, the fixed orifices is upper end open-ended blind hole, the lower extreme of spacing post is located with fixed orifices sliding fit in the fixed orifices, the lower extreme of spacing post is vertical to set up first spring, the upper end of first spring and the bottom surface fixed connection of spacing post, the lower extreme and the support fixed connection of first spring, the upper end of spacing post passes spacing hole upwards stretches out the bottom plate of box girder, the upper end external diameter of spacing post is less than the internal diameter of spacing hole, the middle part of spacing post and with spacing post coaxial fixed connection disc, the bottom plate of box girder place in on the disc.
Further, a torsion spring is sleeved on the upright post, one end of the torsion spring is fixedly connected with the middle beam, and the other end of the torsion spring is fixedly connected with the upright post.
When the box girder is transversely displaced under the action of external force, the upright post can rotate a certain angle by the tension of the connecting piece to enable the torsion spring to be compressed, and the compressed torsion spring can generate elasticity to force the upright post to rotate back to the initial position, so that the purpose of enabling the box girder to quickly recover the initial position is achieved.
Further, a transverse plate is horizontally arranged in the arc-shaped groove, the transverse plate is in sliding fit with the inner wall of the arc-shaped groove to enable the transverse plate to move up and down in the arc-shaped groove, a rolling seat is fixedly connected to the transverse plate, a plurality of rollers are sequentially connected to the rolling seat in a rotating mode along the length direction of the arc-shaped groove, the axes of the rollers are horizontally arranged, the rollers protrude upwards out of the rolling seat, and the lower end face of the movable supporting column is in contact with the rollers;
a strip-shaped air bag is arranged in the arc-shaped groove below the transverse plate along the length direction of the arc-shaped groove, a plurality of second springs are vertically arranged in the strip-shaped air bag along the length direction of the arc-shaped groove in sequence, and two ends of each second spring are fixedly connected with the inner wall of the strip-shaped air bag;
the annular air bag is sleeved on the limiting column in the limiting hole and fixedly connected with the limiting column, and the inner cavity of the annular air bag is communicated with the inner cavity of the strip-shaped air bag through an air pipe.
Under the condition that the box girder is not influenced by external forces such as earthquake, the elasticity of the first spring and the second spring and the gravity balance of the box girder enable the box girder to be in a balanced static state, and at the moment, two inclined planes of the guide block are contacted with two inclined planes on the bottom surface of the through groove on the guide seat;
when the box girder is transversely moved under the action of external force such as an earthquake, the distance between the guide seat and the upright post is larger than the distance between the guide seat and the upright post when the box girder is in a balanced static state, at this time, the guide seat and the guide block are relatively moved, the box girder is lifted upwards under the cooperation of the inclined plane on the guide block and the inclined plane of the through groove on the guide seat, at this time, the box girder is increased by the pressure of the movable supporting column acting on the transverse plate so as to increase the pressure born by the second spring, the pressure born by the first spring is reduced, the strip-shaped air bag in the arc-shaped groove is extruded, the gas in the strip-shaped air bag flows to the annular air bag inner cavity on the limit column through the gas pipe, the annular air bag is expanded, the gap between the annular air bag and the limit hole is reduced to prevent the further movement of the box girder, and the annular air bag plays a buffering and limiting role on the transverse movement of the box girder.
Further, 4 stand columns are symmetrically and uniformly distributed in the middle beam at the corner points of a square, 2 arc-shaped grooves corresponding to the stand columns are respectively formed in the upper surfaces of the support, close to the two ends of the middle beam, of the support, and 2 limit holes corresponding to the stand columns are respectively formed in the box beams, close to the two ends of the middle beam.
The box girder at one end of the middle girder is connected with the support through 2 sets of connecting devices, so that the connection strength between the box girder and the support is improved.
Further, in order to improve the stress intensity of the roof of the box girder, a fixed plate is fixedly connected to the bottom surface of the roof of the box girder, and the guide seat is rotationally connected with the fixed plate.
Further, the connecting piece comprises a connecting plate and a first lantern ring, the first lantern ring is sleeved outside the movable supporting column and is rotationally connected with the movable supporting column, one end of the connecting plate is fixedly connected with the upright column, and the other end of the connecting plate is fixedly connected with the first lantern ring.
Further, the connecting frames are arranged between the adjacent upright posts and connected, and each connecting frame comprises a second annular sleeve which is sleeved outside the upright post in a rotating mode and a connecting rod which is fixedly connected between the adjacent second annular sleeves. The upright posts are connected together through the connecting frame so as to improve the stress intensity of the upright posts.
Further, the middle beam is fixedly connected with the support through bolts, the bottom of the middle beam is integrally formed with a convex block, and the support is provided with a groove matched with the convex block.
The principle and the beneficial effects of the invention are as follows:
1. when the vibration of the box girder in the longitudinal direction caused by the earthquake occurs, the vertical vibration of the box girder acts on the first spring and the second spring through the limit column and the movable support column, the first spring and the second spring can play a role in buffering vibration of the box girder in the vertical direction, the box girder is prevented from being directly contacted with the support to impact the support to damage the support caused by the support, and the box girder falling beam caused by the support fragmentation is further prevented from generating the box girder deflection distortion.
2. When the box girder is transversely moved under the action of external forces such as an earthquake, the distance between the guide seat and the upright post is larger than the distance between the guide seat and the upright post when the box girder is in a balanced static state, at this time, the guide seat and the guide block are relatively moved, the box girder is lifted upwards under the cooperation of the inclined plane on the guide block and the inclined plane of the through groove on the guide seat, at this time, the box girder is increased by the pressure of the movable supporting column acting on the transverse plate, so that the pressure of the second spring is increased, the pressure of the first spring is reduced, the strip-shaped air bag in the arc-shaped groove is extruded, the gas in the strip-shaped air bag flows to the annular air bag inner cavity on the limit column through the gas pipe, so that the annular air bag is expanded, the gap between the annular air bag and the limit hole is reduced, and further movement of the box girder is prevented, and meanwhile, the annular air bag plays a buffering role in the transverse movement of the box girder. The transverse movement of the box girder is converted into the ascending movement of the box girder, and the gravity of the box girder is utilized to carry out the movement energy consumption on the transverse movement of the box girder so as to reduce the transverse movement amplitude of the box girder, so that the box girder is prevented from being displaced to a greater extent due to the movement, and the box girder is prevented from falling.
3. When the box girder transversely moves, the guide seat drives the movable support column to slide along the arc-shaped groove to rotate around the upright column through the guide block, the upright column rotates under the action of the connecting plate to enable the torsion spring to be compressed for energy storage, and the compressed torsion spring forces the upright column to reversely rotate after the box girder moves to enable the box girder to return to the initial position.
Drawings
Fig. 1 is a schematic diagram of a front view direction structure according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a left view direction structure according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view A-A of fig. 2.
Fig. 4 is an enlarged view of a portion a in fig. 1.
Fig. 5 is a schematic view of the arrangement of the rollers in the arc-shaped groove in the top view.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: the support 10, the arc-shaped groove 101, the fixing hole 102, the first spring 103, the bridge pier 20, the middle beam 30, the convex block 301, the groove 302, the box beam 40, the notch 401, the limit hole 402, the upright post 501, the connecting plate 5021, the first lantern ring 5022, the movable support column 503, the guide seat 504, the through groove 5041, the guide block 505, the limit post 506, the disc 507, the fixing plate 508, the torsion spring 509, the cross plate 601, the rolling seat 602, the roller 603, the bar-shaped air bag 604, the second spring 605, the air pipe 606, the annular air bag 607, the second lantern ring 701 and the connecting rod 702.
In the embodiment, as shown in fig. 1, the girder falling prevention device for the girder 40 bridge comprises a support 10, a middle girder 30 and a connecting device, wherein the support 10 is arranged at the top of a pier 20 and fixedly connected with the pier 20, the middle girder 30 is arranged on the support 10, the middle girder 30 is positioned between two adjacent girders 40, the structure of the middle girder 30 is the same as that of the girders 40, the thicknesses of the top plate and the bottom plate of the middle girder 30 are both greater than those of the girders 40, the middle girder 30 is fixedly connected with the support 10 through bolts, in order to improve the connection strength between the middle girder 30 and the support 10, a lug 301 is integrally formed at the bottom of the middle girder 30, and a groove 302 matched with the lug 301 is formed on the support 10.
The connecting device comprises a stand column 501, a connecting piece, a movable supporting column 503, a guide seat 504 and a limiting column 506. Referring to fig. 1 and 3, the columns 501 are vertically arranged, 4 columns 501 are respectively located at square corner points and symmetrically and uniformly distributed in the middle beam 30, the lower ends of the columns 501 penetrate through the bottom plate of the middle beam 30 downwards and are inserted into the support 10 to be rotationally connected with the support 10, the upper ends of the columns 501 are rotationally connected with the top plate of the middle beam 30, torsion springs 509 are respectively sleeved on the upper and lower parts of the columns 501, two ends of the torsion springs 509 on the upper parts of the columns 501 are respectively fixedly connected with the top plate of the middle beam 30 and the columns 501, two ends of the torsion springs 509 on the lower parts of the columns 501 are respectively fixedly connected with the bottom plate of the middle beam 30 and the columns 501, the rotation directions of the torsion springs 509 on the lower parts and the upper parts of the columns 501 are opposite, and the rotation of the columns 501 in two directions can be limited by the elasticity of at least one torsion spring 509.
As shown in fig. 1-3, the adjacent columns 501 are connected by a connecting frame, the connecting frame comprises a second ring sleeve rotatably sleeved outside the column 501 and a connecting rod 702 fixedly connected between the adjacent second ring sleeves, and the columns 501 are connected together by the connecting frame to improve the stress intensity of the columns 501.
As shown in fig. 2, the upper surfaces of the supports 10 near the two ends of the middle beam 30 are respectively provided with 2 arc-shaped grooves 101 corresponding to the upright posts 501, the circle centers of the arc-shaped grooves 101 are respectively positioned on the axes of the corresponding upright posts 501, and the bottom plate of the box beam 40 is provided with a notch 401 in the region corresponding to the arc-shaped groove 101.
Referring to fig. 4 and 5, a cross plate 601 is horizontally arranged in the arc-shaped groove 101, the cross plate 601 and the inner wall of the arc-shaped groove 101 are in sliding fit so that the cross plate 601 can move up and down in the arc-shaped groove 101, a rolling seat 602 which is matched with the arc-shaped groove 101 is fixedly connected to the cross plate 601, a plurality of rollers 603 are sequentially connected to the rolling seat 602 in a rotating manner along the arc length direction of the arc-shaped groove 101, the axes of the rollers 603 are horizontally arranged, and the rollers 603 protrude upwards out of the rolling seat 602.
The movable support column 503 is vertically arranged, the lower end of the movable support column 503 is positioned in the arc-shaped groove 101 and is in sliding connection with the arc-shaped groove 101, and the lower end face of the movable support column 503 is in contact with the roller 603.
A bar-shaped air bag 604 is arranged in the arc-shaped groove 101 positioned below the transverse plate 601 along the length direction of the arc-shaped groove 101, a plurality of second springs 605 are vertically arranged in the bar-shaped air bag 604 in sequence along the length direction of the arc-shaped groove 101, and two ends of each second spring 605 are fixedly connected with the inner wall of the bar-shaped air bag 604;
1-3, the connecting piece level sets up, and the connecting piece includes connecting plate 5021 and first lantern ring 5022, and first lantern ring 5022 cover is established outside removal support column 503 and is connected with removal support column 503 rotation, and connecting plate 5021's one end and stand 501 fixed connection, connecting plate 5021's the other end and first lantern ring 5022 fixed connection.
Referring to fig. 1-3, 2 limiting holes 402 corresponding to the upright posts 501 are respectively formed in the bottom plate of the box girder 40 close to the middle girder 30, the limiting holes 402 vertically penetrate through the bottom plate of the box girder 40, fixing holes 102 corresponding to the limiting holes 402 are vertically formed in the support 10, and the fixing holes 102 are blind holes with openings at the upper ends.
The vertical setting of spacing post 506, the lower extreme of spacing post 506 is located fixed orifices 102 and fixed orifices 102 sliding fit, the vertical first spring 103 that sets up of lower extreme of spacing post 506, the upper end of first spring 103 and the bottom surface fixed connection of spacing post 506, the lower extreme and the support 10 fixed connection of first spring 103, the upper end of spacing post 506 passes spacing hole 402 and upwards stretches out the bottom plate of case roof beam 40, the upper end external diameter of spacing post 506 is less than the internal diameter of spacing hole 402, the middle part and the spacing post 506 integrated into one piece disc 507 of spacing post 506, disc 507 and the coaxial setting of spacing post 506, the bottom plate of case roof beam 40 is placed on disc 507.
Referring to fig. 1-4, an annular air bag 607 is sleeved on the limiting post 506 in the limiting hole 402, the annular air bag 607 is fixedly connected with the limiting post 506, and the inner cavity of the annular air bag 607 is communicated with the inner cavity of the strip-shaped air bag 604 through an air pipe 606.
As shown in fig. 1 and 2, the bottom surface of the box girder 40, which is close to the top plate of the middle girder 30, is fixedly connected with a fixing plate 508, a guide seat 504 is arranged on the bottom surface of the fixing plate 508 corresponding to a movable support column 503 and is rotatably connected with the fixing plate 508, a through groove 5041 is horizontally arranged on the lower surface of the guide seat 504, the bottom surface of the through groove 5041 is provided with an inclined surface which is inclined downwards from the middle part of the through groove 5041 to two ends of the through groove 5041, and the upper end of the movable support column 503 is fixedly connected with a guide block 505 matched with the through groove 5041 of the guide seat 504.
When in actual use, the method comprises the following steps:
when vibration of the box girder 40 in the longitudinal direction caused by an earthquake occurs, the up-and-down vibration of the box girder 40 acts on the first spring 103 and the second spring 605 through the limit columns 506 and the movable support columns 503, the first spring 103 and the second spring 605 can play a role in cushioning the box girder 40 in the up-and-down direction, the box girder 40 is prevented from being directly contacted with the support 10 to impact the support 10 to cause the damage of the support 10, and the box girder 40 falling caused by the fragmentation of the support 10 is further prevented from generating deflection and distortion deformation of the box girder 40.
When the box girder 40 moves transversely under the action of external force such as earthquake, the distance between the guide seat 504 and the upright post 501 is larger or smaller than the distance between the guide seat 504 and the upright post 501 when the box girder 40 is in a balanced static state, at this time, the guide seat 504 and the guide block 505 move relatively, the box girder 40 is lifted upwards under the cooperation of the inclined plane on the guide block 505 and the inclined plane of the through groove 5041 on the guide seat 504, at this time, the pressure of the box girder 40 acting on the transverse plate 601 through the movable support column 503 is increased, so that the pressure of the second spring 605 is increased, the pressure of the first spring 103 is reduced, the strip-shaped air bag 604 in the arc-shaped groove 101 is extruded, the air in the strip-shaped air bag 604 flows to the inner cavity of the annular air bag 607 on the limit post 506 through the air pipe 606 to expand the annular air bag 607, the gap between the annular air bag 607 and the limit hole 402 is reduced, and further movement of the box girder 40 is prevented, and at the same time, the annular air bag 607 plays a buffering role in buffering the transverse movement of the box girder 40. By converting the lateral movement of the box girder 40 into the ascending movement of the box girder 40, the lateral movement of the box girder 40 is subjected to energy consumption by using the gravity of the box girder 40 to reduce the lateral movement amplitude of the box girder 40, so as to prevent the box girder 40 from being displaced to a greater extent due to the movement, and further prevent the box girder 40 from falling down.
When the box girder 40 moves transversely, the guide blocks 505 drive the movable support columns 503 to slide along the arc-shaped grooves 101 to rotate around the upright posts 501, the upright posts 501 rotate under the action of the connecting plates 5021 to enable the torsion springs 509 to be compressed for energy storage, and the compressed torsion springs 509 force the upright posts 501 to rotate reversely after the box girder 40 moves, so that the box girder 40 returns to the initial position.
The foregoing is merely exemplary of the present invention, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (6)
1. The utility model provides a roof beam device falls in roof beam bridge which characterized in that: the bridge pier comprises a support, a middle beam and a connecting device, wherein the support is arranged at the top of a bridge pier and fixedly connected with the bridge pier, the middle beam is arranged on the support and fixedly connected with the support, and the middle beam is arranged between two adjacent box beams;
the connecting device comprises a stand column, a connecting piece, a movable supporting column, a guide seat and a limiting column, wherein the stand column is vertically arranged in the middle beam, the lower end of the stand column downwards penetrates through the bottom plate of the middle beam and is inserted into the support to be rotationally connected with the support, and the upper end of the stand column is rotationally connected with the top plate of the middle beam;
the guide seat is arranged on the bottom surface of the top plate of the box girder and is rotationally connected with the box girder, the lower surface of the guide seat is horizontally provided with a through groove, and the bottom surface of the through groove is provided with an inclined surface which is inclined downwards from the middle part of the through groove to the two ends of the through groove;
the upper surface of the support is provided with an arc-shaped groove, the circle center of the arc-shaped groove is positioned on the axis of the upright post, a notch is formed in the area corresponding to the arc-shaped groove on the bottom plate of the box girder, the movable support column is vertically arranged, the lower end of the movable support column is positioned in the arc-shaped groove and is in sliding connection with the arc-shaped groove, and the upper end of the movable support column is fixedly connected with a guide block matched with the through groove of the guide seat;
the connecting piece is horizontally arranged, one end of the connecting piece is fixedly connected with the upright post, and the other end of the connecting piece is sleeved outside the movable supporting column and is in rotary connection with the movable supporting column;
the bottom plate of the box girder is provided with a limiting hole, the limiting hole vertically penetrates through the bottom plate of the box girder, the support is vertically provided with a fixing hole corresponding to the limiting hole, the fixing hole is a blind hole with an opening at the upper end, the lower end of the limiting column is positioned in the fixing hole and is in sliding fit with the fixing hole, the lower end of the limiting column is vertically provided with a first spring, the upper end of the first spring is fixedly connected with the bottom surface of the limiting column, the lower end of the first spring is fixedly connected with the support, the upper end of the limiting column penetrates through the limiting hole to upwards extend out of the bottom plate of the box girder, the outer diameter of the upper end of the limiting column is smaller than the inner diameter of the limiting hole, the middle part of the limiting column is fixedly connected with a disc coaxial with the limiting column, and the bottom plate of the box girder is placed on the disc;
a torsion spring is sleeved on the upright post, one end of the torsion spring is fixedly connected with the middle beam, and the other end of the torsion spring is fixedly connected with the upright post;
the horizontal plate is horizontally arranged in the arc-shaped groove, the horizontal plate is in sliding fit with the inner wall of the arc-shaped groove to enable the horizontal plate to move up and down in the arc-shaped groove, the horizontal plate is fixedly connected with the rolling seat, the rolling seat is sequentially and rotatably connected with a plurality of rollers along the length direction of the arc-shaped groove, the axes of the rollers are horizontally arranged, the rollers protrude upwards from the rolling seat, and the lower end face of the movable supporting column is in contact with the rollers;
a strip-shaped air bag is arranged in the arc-shaped groove below the transverse plate along the length direction of the arc-shaped groove, a plurality of second springs are vertically arranged in the strip-shaped air bag along the length direction of the arc-shaped groove in sequence, and two ends of each second spring are fixedly connected with the inner wall of the strip-shaped air bag;
the annular air bag is sleeved on the limiting column in the limiting hole and fixedly connected with the limiting column, and the inner cavity of the annular air bag is communicated with the inner cavity of the strip-shaped air bag through an air pipe.
2. A girder dropping prevention device for a girder bridge according to claim 1, wherein: the utility model discloses a box girder, including middle girder, stand, support, middle girder, stand, box girder, support, the stand has 4 stands, 4 stands are located the angular point department symmetry equipartition of square respectively in the middle girder, the support is close to in the middle girder, set up respectively on the upper surface at middle girder both ends 2 arc grooves that correspond with the stand, be close to the middle girder both ends set up respectively with 2 spacing holes that correspond of stand on the box girder.
3. A girder dropping prevention device for a girder bridge according to claim 2, wherein: the bottom surface of the top plate of the box girder is fixedly connected with a fixed plate, and the guide seat is rotationally connected with the fixed plate.
4. A girder dropping prevention device for a girder bridge according to claim 3, wherein: the connecting piece comprises a connecting plate and a first lantern ring, wherein the first lantern ring is sleeved outside the movable supporting column and is rotationally connected with the movable supporting column, one end of the connecting plate is fixedly connected with the upright column, and the other end of the connecting plate is fixedly connected with the first lantern ring.
5. The girder dropping prevention device for a girder bridge according to claim 4, wherein: the connecting frames are arranged between the adjacent upright posts and connected, and each connecting frame comprises a second annular sleeve sleeved outside the upright post in a rotating mode and a connecting rod fixedly connected between the adjacent second annular sleeves.
6. The girder dropping prevention device for a girder bridge according to claim 5, wherein: the middle beam is fixedly connected with the support through bolts, the bottom of the middle beam is integrally formed with a lug, and the support is provided with a groove matched with the lug.
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| CN202210040257.4A CN114232465B (en) | 2022-01-14 | 2022-01-14 | Girder falling prevention device for box girder bridge |
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| CN202210040257.4A CN114232465B (en) | 2022-01-14 | 2022-01-14 | Girder falling prevention device for box girder bridge |
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| CN114232465A (en) | 2022-03-25 |
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