CN105603867A - Multi-stage self-destruction energy absorption buffer type beam-falling preventing device - Google Patents
Multi-stage self-destruction energy absorption buffer type beam-falling preventing device Download PDFInfo
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- CN105603867A CN105603867A CN201610103404.2A CN201610103404A CN105603867A CN 105603867 A CN105603867 A CN 105603867A CN 201610103404 A CN201610103404 A CN 201610103404A CN 105603867 A CN105603867 A CN 105603867A
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- self
- destruction energy
- destruction
- energy absorber
- falling
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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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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a multi-stage self-destruction energy absorption buffer type beam-falling preventing device which is mainly used for preventing a T beam or a box beam in a beam bridge in road and bridge engineering from falling when an earthquake or extreme accident occurs. The device is structurally characterized in that an installation hole in the longitudinal direction of a bridge is preformed in a beam body transverse partition plate at the end of a beam plate, a beam-falling preventing pull rod is arranged in the installation hole, the two ends of the beam-falling preventing pull rod are arranged into extrusion type self-destruction energy absorbers respectively, a gap is kept between the end faces of the self-destruction energy absorbers through two interlocked nuts at the two ends of the beam-falling preventing pull rod, and the two interlocked nuts touch and press the end faces of the self-destruction energy absorbers in the beam falling state. When impacted, the energy absorbers are rapidly damaged, consume energy and abdicate buffer distance in time, and the device is simple in structure, and can achieve low-carbon environmental protection and achieve the effects that the construction difficulty is low, operation is easy, the cost is low, materials are easy to obtain and secondary damage is small.
Description
Technical field
The present invention relates to the device that a kind of T beam that is mainly used in beam bridge in road and bridge engineering or case beam prevent the multistage self-destruction energy-absorbing buffering formula girder falling falling in the time of earthquake or extreme unexpected generation, being also applicable to other building has the member requiring that prevents from dropping to prevent from collapsing.
Background technology
At present, along with construction of road and bridge project significantly increases, bridge security of operation problem has been mentioned new height, and in the time of earthquake or extreme disaster generation, the beam that falls is a large secondary disaster. In present bridge technology specification, clearly proposed no damage in small earthquake, middle shake can be repaiied, and the requirement of the beam that do not fall while shake is greatly implemented requirement but the release of this regulation must will have corresponding measure means to meet. When the beam that falls occurs in, between bridge pier, abutment and the bridge plate of beam bridge, relative displacement occurs, if displacement exceeds after the mobile range that designs the maximum lap of splice, beam slab one end departs from pier and the phenomenon that falls. Between beam slab and pier, maintaining the movement of permission, is that protection bridge pier is not subject to seismic wave to impact a kind of earthquake resistant construction of cutting pier total collapse, can avoid larger breakoff phenomenon. There is the mobile possibility that just has beam! As long as but have a kind of one end that can hold beam in the time that beam slab falls of installing, make it ground and pier not to be produced to secondary impact, also to guarantee self under beam-ends, in drop impact, not lose efficacy simultaneously, just can reach the object of restrainer, provide advantage for rescuing or repairing.
Now more existing anti-fall girder apparatus products are being released gradually, but in these effective anti-fall girder apparatus, be all a set of device of more than ten thousand yuan cost at present, some have adopted pull bar drag-line accessory that cable-stayed bridge or suspension bridge use as girder falling pull bar, be characterized in that complex structure is expensive, calculate with 14 covers for a bridge, bridge reach hundreds of thousands to the input of millions of units to this technology promote the use of without solidifying be a kind of obstruction; Only focus on pull bar intensity, do not establish effective crash energy absorption equipment, can be directed at pull bar and beam body connecting portion and in dropping process, draw broken beam body and lost efficacy. The just rubber buffer adopting in existing device, but the compression distance of rubber blanket is very limited, the chance that uses separately rubber buffer to recover because can not get elasticity, the rubber blanket after distortion does not have cushioning effect.
Summary of the invention
In order to overcome the deficiency of existing anti-fall girder apparatus, the object of this invention is to provide the anti-fall girder apparatus of a kind of T of being applicable to beam, case beam, it can reach low-carbon environment-friendly, difficulty of construction low, operate effect simple and easy, that cost is low, material is easily obtained, secondary injury is little, can be used for again new bridge construction and also can be used for bridge maintenance and strengthening.
Realizing the technical scheme that above-mentioned purpose of the present invention takes is: the beam body diaphragm plate in beam slab end is preset along the longitudinal installing hole of bridge, in installing hole, pack girder falling pull bar into, the two ends of girder falling pull bar are respectively charged into extrusion pressing type self-destruction energy absorber, and the end face of self-destruction energy absorber keeps gap by the interlocking double nut at girder falling pull bar two ends, interlocks double nut in pressing the endface position of self-destruction energy absorber in the time falling beam state.
Self-destruction energy absorber is column with the level, and column Surface Machining has a series of grooves, and self-destruction energy absorber tandem compound use time should hold greatly large end, small end is to small end.
Between the self-destruction energy absorber of assembling on girder falling pull bar and interlocking double nut, backing plate is all housed between self-destruction energy absorber and beam body diaphragm plate.
In the cavity of the self-destruction energy absorber of arranging in outermost end, be provided with brokenly residual cone, it is shaped as the cone with mesopore.
Between the self-destruction energy absorber of assembling on girder falling pull bar and beam body diaphragm plate, be provided with rubber buffer.
The step column of self-destruction energy absorber is cylindric or polygon column, and a series of grooves on column surface are axially-aligned.
Whole self-destruction energy absorber is included in protective cover.
Know-why of the present invention is: self-destruction energy-absorbing buffering technology makes to be held after the motion of falling starts by the static beam slab to freely falling body, and the moment tensile impact that the heavily loaded beam body not fallen produces is broken pull bar or is drawn the broken position being connected with beam body to lose efficacy and again fall, because pulling force is at this moment superimposed the making a concerted effort of beam body weight power and impulsive force:
Moment pulling force P=mg+m Δ v/ Δ t.
(m: beam-ends quality, g: acceleration of gravity, Δ v: speed increment, Δ t: incremental time).
Larger or the shorter impulsive force of transformation period is just larger by the velocity variations of known whereabouts in formula, can substantially exceed gravity. Preceding paragraph in formula is can not change from gravity, only manages consequent impulsive force to drop to minimum, and the method that reduces to impact is that extending speed transformation period, reduction end speed reduce velocity variable. Design of the present invention is used for gradation by impulsive force and smashes the self-destruction energy absorber being arranged in device and carry out consumed energy, the process of repeatedly smashing moment allows the beam-ends that falls always approach the initial stage in the segmentation movement of falling object because of inertia, reduce stage initial velocity, after segmentation, relatively extend the resultant action time, and born the direct impulsive force in the little stage with rubber buffer. Anti-fall girder apparatus in the present invention is made up of following five parts: 1, use and can plastic deformation have the common standard part pull bar of sufficient intensity as main bearing capacity pull bar. 2, type self-destroyed energy absorber. Energy absorber is step-like column (two open column shape bodies is formed by stacking), the shear surface when joint face of large column cylinder and pillar shape cylinder is pressurized, and the paxilla being stressed after shear fracture embeds in large cylinder ring bodies, forms the state of partly ruining. Be subject to the effective thickness of shearing face can determine energy absorber breakdown pressure size, adopt multistage variable-force energy absorber to subdue initial impact and delay step by step and follow whereabouts, the time-lag action when tandem energy of different bearing capacity pieces obtains Top Down Break Down. 3, rubber buffer. Delay when the conquassation of self-destruction energy absorber damages to produce the secondary impulsive force of short distance, wait for a new wave impact in next energy absorber conquassation momentary recovery elasticity. 4, broken residual cone. Excessive when beam body deadweight, while needing the requiring of larger buffer distance, the residual circle crushing-type of energy absorber being enclosed within on pull bar is become to all-destroyed energy-absorbing with broken residual cone, can further crush secondary energy-absorbing and reserve secondary buffer space. 5, protective cover. Adopt cup-shaped decoration protective cover to collect self-destruction relic, use cup end fixed form to install.
The invention has the beneficial effects as follows, adopt the disposable plastic deformation of common standard part pull bar to make main bearing capacity pull bar, accessory and material are general, easily processing is easily made, double nut locking mechanism ensures pulling force, stop flexible gap, also can prevent artificial disappearance, long-term work after the zinc-plated processing of all metalwork surface heats; Self-destruction energy absorber material adopts brittle metal or nonmetallic materials to make, and cast iron quality applicability is better, non-maintaining in the military service phase. Self-destruction energy absorber converts pressure to shearing force with the columnar hollow solid of two unequal sections, between large cylinder endoporus and paxilla, form and be subject to shear surface, change be subject to the adjustable energy absorber of shear surface effective area be subject to shearing force size, when installation, combine by multiple pressurized specification, head to head tail uses tail plural serial stage mutually, can be used for different engineering energy-absorbings, order self-destruction while playing a role. Energy absorber adopts annular residue structure, can avoid bulk part self-destruction material falling from high altitude to produce secondary injury Opportunity formation and partly ruin formula energy-absorbing. Can help the formula of unmaking for large volume beam body by partly ruining residual ring body crushing-type with broken residual cone. Metal self-destruction energy absorber of the present invention has been done broken residual design: surface is provided with multiple stress rupture groove, separation trough, and inside and outside residual ring body fluting distributes and staggers, and makes it can be decomposed and carry out secondary energy-absorbing by broken residual cone after conquassation; Rubber buffer is the loop configuration body of two plate holder one glue, with the same life-span of rubber support, is the parts that need change mid-term; Decorate protective cover at ordinary times for attractive, decorative, accessory does not expose and can prevent ageing of rubber, and the chip of accepting self-destruction energy absorber when stressed makes it not become falling from high altitude thing.
Because girder falling pull bar is made front topic with disposable plastic deformation when stressed, too large (steel as more in phosphorus content) of its rigidity, this device usage quantity depending on matter depending on beam body constant weight, in large quality beam body application, pulling force is excessive, should increase Plant arrangement number and can not simply increase the bearing capacity of device.
Brief description of the drawings
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
Fig. 1 is that multistage half self-destruction energy-absorption type anti-fall girder apparatus is for the initial total figure in bridge pier place.
Fig. 2 is that multistage full self-destruction energy-absorption type anti-fall girder apparatus is for the initial total figure of Abutment.
Fig. 3 is the present invention's state diagram after half self-destruction energy-absorbing in the time falling beam.
Fig. 4 is the present invention's state diagram after full self-destruction energy-absorbing in the time falling beam.
Fig. 5 is cast iron self-destruction energy absorber exact shape figure of the present invention.
In figure, 1. beam slab beam-ends, 2. interlocking double nut, 3. backing plate, 4. self-destruction energy absorber, 5. protective cover, 6. beam body diaphragm plate, 7. girder falling pull bar, 8. rubber buffer, 9. broken residual cone, the beam beam-ends that 10. falls, 11. bridge pads, 12. pier cap beams, 13. caps.
Detailed description of the invention
In Fig. 1, Fig. 2, bridge pad 11 is arranged on pier cap beam 12 or cap 13, beam slab beam-ends 1 and fall beam beam-ends 10 normal mounting on bridge pad 11. Beam body diaphragm plate 6 is beam slab beam-ends 1 and the part falling in beam beam-ends 10 structures. Girder falling pull bar 7 is arranged in the installing hole of two beam body diaphragm plates 6, and assembly method is to install at first to decorate protective cover 5, then at opposite side, a set of rubber buffer 8 is installed. In Fig. 2, be placed in the device at abutment position, because platform has backfill soil in limit behind, self-destruction energy absorber 4 is all arranged on a side of beam body diaphragm plate 6; In Fig. 1, be placed in the device at bridge pier position, self-destruction energy absorber 4 can be arranged on respectively the two ends of beam body diaphragm plate 6. More than 4 of self-destruction energy absorbers need to hold large end greatly while being installed in series, and small end is installed small end, and backing plate 3 pads respectively at self-destruction energy absorber 4 other ends. During as all-destroyed combination, install a broken residual cone 9 additional in self-destruction energy absorber 4 outsides of outermost end. Interlocking double nut 2 is installed respectively at the two ends place of girder falling pull bar 7, and locking mutually. Girder falling pull bar 7 after the locking of interlocking double nut 2 go here and there between each accessory all retention gaps, guarantee beam physical efficiency free-extension.
In Fig. 3, when earthquake occurs, if beam slab beam-ends 1 and the beam beam-ends 10 that falls produce entirety after the axial displacement of bridge, in the time that amount of movement is excessive, there will be a beam-ends to depart from bridge pad 11, pier cap beam 12 or cap 13 and the beam accident that falls. When the beam beam-ends 10 that falls leaves in the dropping process of bridge pad 11, pier cap beam 12 or cap 13, first girder falling pull bar 7 is bent and produces plastic deformation by gravity, is out of shape afterwards bearing tension thereupon. The self-destruction energy absorber 4 of connecting in girder falling pull bar 7 is extruded mutually, and first the self-destruction energy absorber 4 of load minimum consumes part energy and be extruded shearing self-destruction, and for continuing to fall to reserving one section of space. The secondary impulsive force producing when 4 self-destruction of self-destruction energy absorber is born by rubber buffer 8, moment rubber buffer in the time of 4 conquassation of next self-destruction energy absorber 8 recovers elasticity, and wait for the impact of a new ripple, self-destruction energy absorber 4 with stressed size successively conquassation self-destruction until fall to stopping. When self-destruction, the broken residue of self-destruction energy absorber 4 is mutually nested continues to bear pressure on girder falling pull bar 7, forms half type self-destroyed assembly energy-absorbing, and the chip of generation falls into be decorated protective cover 5 and avoid falling from high altitude.
In Fig. 4, in the buffering combination of self-destruction energy absorber 4, outermost end is equipped with a broken residual cone 9, in the time that self-destruction energy absorber 4 is pressed shear fracture, paxilla embeds after large cylinder intracavity, just by broken residual cone 9 spallings, under further impact force action, broken paxilla residue, by residual large cylinder ring spalling, falls into and decorates the all-destroyed secondary energy-absorbing of the interior formation of protective cover 5, and slot milling carries out next stage impact and delays.
In Fig. 5, self-destruction energy absorber is column with the level, can adopt cylindric or polygon column, and column Surface Machining has a series of destruction grooves, and groove is axially-aligned, and self-destruction energy absorber tandem compound use time should hold greatly large end, small end is to small end.
Claims (7)
1. a multistage self-destruction energy-absorbing buffering formula anti-fall girder apparatus, it is characterized in that: the beam body diaphragm plate in beam slab end is preset along the longitudinal installing hole of bridge, in installing hole, pack girder falling pull bar into, the two ends of girder falling pull bar are respectively charged into extrusion pressing type self-destruction energy absorber, and the end face of self-destruction energy absorber keeps gap by the interlocking double nut at girder falling pull bar two ends, the beam state that falls interlocking double nut presses the end face of self-destruction energy absorber.
2. according to multistage self-destruction energy-absorbing buffering formula anti-fall girder apparatus claimed in claim 1, it is characterized in that: self-destruction energy absorber is column with the level, column Surface Machining has a series of grooves, and self-destruction energy absorber tandem compound use time should hold greatly large end, small end is to small end.
3. according to multistage self-destruction energy-absorbing buffering formula anti-fall girder apparatus claimed in claim 2, it is characterized in that: between the self-destruction energy absorber of assembling on girder falling pull bar and interlocking double nut, backing plate is all housed between self-destruction energy absorber and beam body diaphragm plate.
4. according to multistage self-destruction energy-absorbing buffering formula anti-fall girder apparatus claimed in claim 2, it is characterized in that: in the cavity of the self-destruction energy absorber of arranging in outermost end, be provided with brokenly residual cone, it is shaped as the cone with mesopore.
5. according to multistage self-destruction energy-absorbing buffering formula anti-fall girder apparatus claimed in claim 2, it is characterized in that: between the self-destruction energy absorber of assembling on girder falling pull bar and beam body diaphragm plate, be provided with rubber buffer.
6. according to multistage self-destruction energy-absorbing buffering formula anti-fall girder apparatus claimed in claim 2, it is characterized in that: the step column of self-destruction energy absorber is cylindric or polygon column, a series of grooves on column surface are axially-aligned.
7. according to multistage self-destruction energy-absorbing buffering formula anti-fall girder apparatus claimed in claim 2, it is characterized in that: whole self-destruction energy absorber is included in protective cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610103404.2A CN105603867B (en) | 2016-02-25 | 2016-02-25 | Multistage self-destruction energy-absorbing buffering formula falling stop boom device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610103404.2A CN105603867B (en) | 2016-02-25 | 2016-02-25 | Multistage self-destruction energy-absorbing buffering formula falling stop boom device |
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| CN105603867A true CN105603867A (en) | 2016-05-25 |
| CN105603867B CN105603867B (en) | 2017-08-25 |
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| CN201610103404.2A Active CN105603867B (en) | 2016-02-25 | 2016-02-25 | Multistage self-destruction energy-absorbing buffering formula falling stop boom device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106567325A (en) * | 2016-11-14 | 2017-04-19 | 西南交通大学 | Combined type anti-falling beam and collision device |
| CN106758770A (en) * | 2016-12-10 | 2017-05-31 | 青岛智享专利技术开发有限公司 | A kind of road and bridge bend overturning self-help apparatus |
| CN109881574A (en) * | 2019-04-18 | 2019-06-14 | 上海市城市建设设计研究总院（集团）有限公司 | Using the prefabricated bent cap in π type cross section and its method for prefabricating of external prestressing steels |
| CN110448822A (en) * | 2018-05-07 | 2019-11-15 | 郑州大学 | Human body fall protects absorption systems |
| CN113136789A (en) * | 2021-05-06 | 2021-07-20 | 中国地震局工程力学研究所 | Rotary box girder anti-falling device |
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| CN205382398U (en) * | 2016-02-25 | 2016-07-13 | 昆明喆凯工程技术有限公司 | Multistage self -destruction energy absorption buffer formula roof beam device of preventing falling |
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| JPH0995908A (en) * | 1995-09-29 | 1997-04-08 | Tokyo Fabric Kogyo Kk | Damping device and connection type bridge falling prevention device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106567325A (en) * | 2016-11-14 | 2017-04-19 | 西南交通大学 | Combined type anti-falling beam and collision device |
| CN106758770A (en) * | 2016-12-10 | 2017-05-31 | 青岛智享专利技术开发有限公司 | A kind of road and bridge bend overturning self-help apparatus |
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| CN109881574A (en) * | 2019-04-18 | 2019-06-14 | 上海市城市建设设计研究总院（集团）有限公司 | Using the prefabricated bent cap in π type cross section and its method for prefabricating of external prestressing steels |
| CN109881574B (en) * | 2019-04-18 | 2024-04-09 | 上海市城市建设设计研究总院（集团）有限公司 | Pi-shaped cross section prefabricated bent cap adopting external prestressed tendons and prefabricating method thereof |
| CN113136789A (en) * | 2021-05-06 | 2021-07-20 | 中国地震局工程力学研究所 | Rotary box girder anti-falling device |
| CN113136789B (en) * | 2021-05-06 | 2022-06-24 | 中国地震局工程力学研究所 | Rotary box girder anti-falling device |
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