CN112796209A - Super-elastic air bag bridge pier protection device - Google Patents
Super-elastic air bag bridge pier protection device Download PDFInfo
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- CN112796209A CN112796209A CN202110133468.8A CN202110133468A CN112796209A CN 112796209 A CN112796209 A CN 112796209A CN 202110133468 A CN202110133468 A CN 202110133468A CN 112796209 A CN112796209 A CN 112796209A
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- Prior art keywords
- polyurethane
- glass fiber
- pier
- superelastic
- fiber reinforced
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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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/14—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands
- E01F15/141—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands for column or post protection
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/40—Plastics
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The utility model provides a hyperelastic gasbag pier protector, piles up by a plurality of anticollision unit and constitutes, every anticollision unit structure is: the shell inner chamber of square is separated for 27 the same airtight cavities by two horizontal baffles and two vertical baffles, and all packs in 27 airtight cavities and has polyurethane elasticity expanded material, and the material of above-mentioned shell and two horizontal baffles and two vertical baffles is polyurethane or fine reinforcing polyurethane material of glass. The collision avoidance units have the same energy absorption and buffering functions in six directions, namely front, back, left, right, up and down directions. And adopting collision avoidance units with different energy levels and different sizes to stack protective bodies with various shapes on a protective site. The device has the characteristics of strong shock resistance, simple structure, low manufacturing cost and the like.
Description
Technical Field
The invention relates to the technical field of structural engineering protection, in particular to an anti-collision buffer device for bridge piers.
Background
With the development of market economy, highway and railway traffic is all-round, and due to the fact that various geological disasters accompany in mountainous areas and canyons, bridge abutment protection in the areas is not paid attention all the time, so that the capacity of a bridge for resisting adverse geological disasters is far insufficient, and severe examination is brought to the safety of the bridge; municipal road networks in the current city construction process are increasingly dense, various municipal elevated overpasses are complex in complexity, and the risk that a vehicle impacts a pier is greatly increased along with the great increase of traffic volume. In a severe collision accident of a bridge pier, in addition to casualties and huge direct economic losses, indirect economic losses and social influences caused by the fact that traffic lines are blocked are difficult to estimate.
At present, most of pier parts with various collision risks are not specially designed, and only individual piers are provided with simple protective measures according to needs. Although these simple measures can reduce the impact damage of the impactor and the pier to a certain extent, they have many disadvantages and shortcomings due to lack of systematic research, and cannot meet the market demand.
The first publication discloses a road bridge collision avoidance device (CN 201922124869.8): the crashproof stand is installed on the overhead backing plate, and there is the top cap on this stand top, and fixed cover is installed to the stand both sides, and this stand is inside to have reinforcing bar and steel ring, and the rubber layer is installed to the stand inside wall, installs the crashproof baffle between the stand.
Document two discloses "a collision avoidance unit for a pier, a collision guard ring, and a collision avoidance device" (CN 201720110311.2): the anti-collision unit is an L-shaped anti-collision main body formed by rubber, the inner side of the main body is provided with a groove, and the outer side surface of the main body is provided with a lug A which is embedded with the groove.
Document three discloses a "buffering energy-absorbing type crash block" (CN 201420485532.4): the foam material is composed of a polyurethane shell filled with a plurality of flat polystyrene foam blocks, and polyurethane filler is filled between every two adjacent foam blocks. When collision happens, the polyurethane shell deforms, the polystyrene foam material inside the polyurethane shell is extruded to deform, collision potential energy is absorbed in the deformation process, and damage caused by collision of a ship and a bridge is reduced.
The prior art belongs to a rigid anti-collision device, is only suitable for low-energy impact occasions, and has high installation and maintenance costs. The second document pertains to a flexible anti-collision device, which is formed by embedding rubber bumps on an L-shaped rubber main body, and the energy absorption and buffering functions of the device are achieved only through limited deformation of rubber, so that most of energy is still borne by a pier in the case of high-energy impact, the pier still bears large impact force, and the impact force borne by the pier cannot be effectively reduced by the protection of the type, so that due protection cannot be achieved for the pier.
The third document belongs to a flexible anti-collision body, which has the following defects that the structure needs to be further improved; secondly, the buffering and energy absorbing functions need to be further improved; thirdly, the manufacturing cost needs to be reduced.
Disclosure of Invention
The invention aims to provide a super-elastic air bag pier protection device which is simple in structure, has completely the same stress-strain performance on six surfaces in each anti-collision unit and has stronger energy absorption and buffering properties.
The purpose of the invention is realized as follows: the utility model provides a hyperelastic gasbag pier protector, piles up by a plurality of anticollision unit and constitutes, every anticollision unit structure is: the shell inner chamber of square is separated for 27 the same airtight cavities by two horizontal baffles and two vertical baffles, and all packs in 27 airtight cavities and has polyurethane elasticity expanded material, and the material of above-mentioned shell and two horizontal baffles and two vertical baffles is polyurethane or fine reinforcing polyurethane material of glass.
The Shore hardness of the glass fiber reinforced polyurethane material is 85-96 degrees; the density of the polyurethane elastic foaming material is 0.10-0.3 g/cm3。
The length, the width and the height of the shell are respectively 1000mm, 1000mm and 1000mm, the thickness of the shell is 50mm, and the thicknesses of the two horizontal partition plates and the two vertical partition plates are both 30 mm. The Shore hardness of the glass fiber reinforced polyurethane material is 96 degrees; the density of the polyurethane elastic foaming material is 0.12 g/cm3。
The shell, the two horizontal sliding plates and the two vertical partition plates are integrally manufactured or fixedly integrated by bonding.
The mass ratio of polyurethane to glass fiber in the glass fiber reinforced polyurethane material is 3: 1.
And the anti-collision units with different energy levels are manufactured by adjusting the hardness of the glass fiber reinforced polyurethane material and the density of the polyurethane elastic foaming material.
The glass fiber reinforced polyurethane material is formed by compounding glass fiber or glass fiber cloth and polyurethane.
Compared with the prior art, the invention has the beneficial effects that:
1) simple structure, low manufacturing cost and convenient field assembly.
The square shell is divided into closed spaces with the same size of 3 multiplied by 3 by a horizontal partition plate and a vertical partition plate, and polyurethane foaming materials are filled in each closed space.
2) The six faces of each collision avoidance unit have the same stress-strain performance when being subjected to impact force from six directions, namely, the six directions of each collision avoidance unit are all the same when being subjected to the same impact force. In the third document, referring to fig. 1 and 2 of the third document, the impact absorbing and buffering action of the impact-proof block on the impact from the left-right direction is greatly different from that on the impact from the up-down direction. That is, the impact from the left-right direction and the impact from the front-rear direction of the impact pad show different strains.
3) The system anti-collision units with different energy levels can be manufactured, and the application requirements of different occasions are met. The anti-collision units with different energy levels can be conveniently manufactured by adjusting the hardness of the materials of the shell, the two horizontal partition plates and the two vertical partition plates and adjusting the density of the filled polyurethane foam material.
4) The anti-collision units with different energy levels and different sizes can be used for piling protective bodies in various shapes as anti-collision devices according to the actual situation of a protective field.
5) Through experimental tests, the anti-collision unit has strong impact resistance, has good force reducing effect under collision and impact, and has stable and stable counter-force time-course curve.
Drawings
Fig. 1 is an outline view of the present collision avoidance unit, namely a polyurethane airbag.
FIGS. 2 and 3 are sectional views (unit: mm) taken along line A-A and line B-B of FIG. 1, respectively.
FIG. 4 is a tensile stress strain diagram of a polyurethane pure material.
Fig. 5 is a tensile stress strain diagram of the glass fiber reinforced polyurethane material.
Fig. 6 is a diagram (photograph) of a crash unit impact test process.
Fig. 7 is a process diagram of the impact test of the buffer material in the collision cell block.
Fig. 8 is a graph of the impact time course of the collision avoidance unit.
Detailed Description
Fig. 1, 2 and 3 show a super-elastic air bag pier protection device, which is formed by stacking a plurality of anti-collision units, wherein each anti-collision unit has the following structure: the 1a inner chamber of the square shell is divided into 27 identical airtight cavities by two horizontal partition plates 1b and two vertical partition plates 1c, and polyurethane elastic foaming materials are filled in the 27 airtight cavities, and the materials of the shell 1a, the two horizontal partition plates 1b and the two vertical partition plates 1c are polyurethane or glass fiber reinforced polyurethane materials. (glass fiber-reinforced polyurethane: ISSN: 1005-6262: 2009: 000: 002 pages 43-46, manufacturer: Litgen chemical trade company of Dongguan City, Pasf Germany, Fumai material Co., Ltd. Tu Tuta, Jiangsu Yuansheng composite Material technology Co., Ltd. Dadong resin chemical Co., Ltd.)
The Shore hardness of the glass fiber reinforced polyurethane material is 85-96 degrees; the density of the polyurethane elastic foaming material is 0.10-0.3 g/cm3。
Example 1: the length × width × height of the housing 1a is 1000mm × 1000mm × 1000mm, respectively, the thickness of the housing is 50mm, and the thicknesses of the two horizontal partition plates 1b and the two vertical partition plates 1c are both 30 mm. The Shore hardness of the glass fiber reinforced polyurethane material is 96 degrees; the density of the polyurethane elastic foaming material is 0.12 g/cm3。
The shell 1a, the two horizontal sliding plates 1b and the two vertical partition plates 1c are integrally manufactured or fixedly integrated by bonding.
The mass ratio of polyurethane to glass fiber in the glass fiber reinforced polyurethane material is 3: 1.
And the anti-collision units with different energy levels are manufactured by adjusting the hardness of the glass fiber reinforced polyurethane material and the density of the polyurethane elastic foaming material.
The glass fiber reinforced polyurethane material is formed by compounding glass fiber or glass fiber cloth and polyurethane.
The rigidity of the protection device is changed by adjusting the hardness of polyurethane and the number of the composite layers of glass fiber cloth or adjusting the hardness of glass fiber reinforced polyurethane and the density of the filled polyurethane foaming material, so that the protection device is suitable for protection requirements of different energy levels.
According to the invention, polyurethane and glass fiber are compounded, the composite mass ratio is 3:1, and the structure prepared by the method has the properties of high tearing strength, moderate tensile deformation and the like; the structure of the protective device is shown in figure 1, and the appearance of the protective device can be adjusted by the actual size of a pier; the size of the protective layer is set according to the protection grade requirement through finite element collision analysis and actual impact test.
The stress strain of the polyurethane pure material is shown in figure 4 (maximum strain is 4, corresponding to stress 4.0 MPa); after the polyurethane pure material and the glass fiber are compounded according to the mass ratio of 3:1, the stress strain is shown in figure 5 (the maximum strain is 3.5, and the corresponding stress is 24 MPa). The tensile stress of the compounded material is improved by 6 times compared with that of the non-compounded material.
The structure of the super-elastic material wrapped filling material is adopted for impact test, and the test structure shows that: 1. no crack appears on the whole structure; 2. after the impact, the protection device can be restored to the original state; the impact process is shown in figure 6.
Simulating the rigid collision of a pier, wherein the 20kJ collision counterforce is 1800kN, and the counterforce time-course curve is shown in figure 7; the protection device is subjected to 500kJ energy collision, the protection counter force is 1516kN, and the counter force time-course curve is shown in figure 8. Under the unprotected condition, the maximum simulation energy of the rigid impact test is 20kJ in consideration of safety and reliability factors. From the analysis of the experimental data: after the energy level is improved by 25 times, the counterforce under protection is still lower than the rigid collision counterforce under low energy, which shows that the air bag protection device has good force reduction effect and the counterforce time-course curve is stable and stable.
Claims (8)
1. The utility model provides a hyperelastic gasbag pier protector which characterized in that piles up by a plurality of anticollision unit and constitutes, and every anticollision unit structure is: the square is divided into 27 same airtight cavities by two horizontal clapboards (1b) and two vertical clapboards (1c) in shell (1a) inner chamber, and all filled with polyurethane elasticity expanded material in 27 airtight cavities, and the material of above-mentioned shell (1a) and two horizontal clapboards (1b) and two vertical clapboards (1c) is polyurethane or glass fibre reinforcing polyurethane material.
2. The super-elastic airbag pier protective device according to claim 1, wherein the Shore hardness of the glass fiber reinforced polyurethane material is 85-96 degrees; the density of the polyurethane elastic foaming material is 0.10-0.3 g/cm3。
3. A superelastic balloon pier protector according to claim 1, wherein the outer shell (1a) has a length x width x height of 1000mm x 1000mm, respectively, and a thickness of 50mm, and wherein the two horizontal (1b) and vertical (1c) partitions are each 30mm thick.
4. A superelastic air-bag pier protector according to claim 1, wherein the glass fiber reinforced polyurethane material has a shore hardness of 96 degrees; the density of the polyurethane elastic foaming material is 0.12 g/cm3。
5. A superelastic air-bag pier protector according to claim 1, wherein said outer shell (1a) and both horizontal sliding plates (1b) and both vertical partitions (1c) are made integrally or fixed integrally by gluing.
6. A superelastic air-bag pier protector according to claim 1, wherein the glass fiber reinforced polyurethane material has a polyurethane to glass fiber mass ratio of 3: 1.
7. A superelastic air bag pier protective device according to any one of claims 1 to 6, wherein the hardness of the glass fiber reinforced polyurethane material and the density of the polyurethane elastic foam material are adjusted to produce collision avoidance units of different energy levels.
8. A superelastic air-bag pier protector according to claim 7, wherein said fiberglass-reinforced polyurethane material is formed by compounding fiberglass or fiberglass cloth with polyurethane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110133468.8A CN112796209A (en) | 2021-02-01 | 2021-02-01 | Super-elastic air bag bridge pier protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110133468.8A CN112796209A (en) | 2021-02-01 | 2021-02-01 | Super-elastic air bag bridge pier protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112796209A true CN112796209A (en) | 2021-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110133468.8A Pending CN112796209A (en) | 2021-02-01 | 2021-02-01 | Super-elastic air bag bridge pier protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112796209A (en) |
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2021
- 2021-02-01 CN CN202110133468.8A patent/CN112796209A/en active Pending
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