WO2019024468A1 - Separable bridge pier anti-collision system - Google Patents
Separable bridge pier anti-collision system Download PDFInfo
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- WO2019024468A1 WO2019024468A1 PCT/CN2018/073683 CN2018073683W WO2019024468A1 WO 2019024468 A1 WO2019024468 A1 WO 2019024468A1 CN 2018073683 W CN2018073683 W CN 2018073683W WO 2019024468 A1 WO2019024468 A1 WO 2019024468A1
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- collision
- layer
- buffer layer
- pier
- bridge pier
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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
- 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
- E01F15/145—Means for vehicle stopping using impact energy absorbers
- E01F15/146—Means for vehicle stopping using impact energy absorbers fixed arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
Disclosed is a separable bridge pier anti-collision system, comprising an anti-collision body provided surrounding a bridge pier column and fixed by means of welding and machining to a steel plate pre-embedded on a bearing platform, characterised in that the anti-collision body comprises an air isolation layer (2), an inner lining drum (3), a buffer layer (4) and an anti-collision layer (5); the air isolation layer (2) envelops the bridge pier column, the inner lining drum (3) envelops the air isolation layer (2), the buffer layer (4) is provided surrounding the inner lining drum (3), and the anti-collision layer (5) envelops around the buffer layer (4); and a bottom end of the anti-collision body is fixedly connected by means of welding to the pre-embedded steel plate on the bearing platform. The separable bridge pier anti-collision system has advantages such as excellent energy absorption effects, being replaceable, low cost of maintenance, and being environmentally friendly.
Description
本发明属于桥墩防撞技术领域,特别涉及一种分离式桥墩防撞系统。The invention belongs to the technical field of bridge pier collision avoidance, and particularly relates to a separate pier anti-collision system.
随着我国基础设施建设的不断完善,大跨桥梁、大跨度建筑结构规模不断扩大,保障结构安全尤为重要。车(船)撞桥事故在世界各地一直不断地发生,造成了难以承受的生命与财产损失,因此对桥梁采取防撞措施尤为重要。桥梁的抗冲击能力一般只能由防撞保护系统提供,以缓冲车(船)的撞击力,使桥墩和车(船)的损失程度尽可能缩小。通过桥墩周围防撞系统的设置,来延长车(船)的碰撞时间,减小撞击力,从而更好地保护桥墩和车(船)的安全。桥墩防撞系统目前多采用弹性效能材料或者高阻尼的复合材料,成本高、占用空间大、抗腐蚀能力弱,吸能效果的不足是构件受损的最主要因素,大大的限制了结构的使用年限,并且导致后期需要花很大的代价进行维修。现有技术从吸能效果、维护、环保等角度考虑均有待进一步加以改进。With the continuous improvement of infrastructure construction in China, the scale of large-span bridges and large-span buildings is constantly expanding, and it is particularly important to ensure structural safety. Cars (ships) hitting bridge accidents have been happening all over the world, causing unbearable loss of life and property, so it is especially important to take anti-collision measures on bridges. The impact resistance of a bridge can only be provided by an anti-collision protection system to cushion the impact of the vehicle (ship) and to minimize the loss of the pier and the ship (ship). Through the setting of the collision avoidance system around the pier, the collision time of the vehicle (ship) is extended, and the impact force is reduced, thereby better protecting the safety of the pier and the ship (ship). At present, the pier anti-collision system mostly adopts elastic performance materials or high damping composite materials, which has high cost, large space occupation and weak corrosion resistance. The lack of energy absorption effect is the most important factor for component damage, which greatly limits the use of the structure. Years, and leading to the need to spend a lot of time to repair. The prior art needs to be further improved from the viewpoints of energy absorption, maintenance, and environmental protection.
发明内容Summary of the invention
本发明针对现有的墩(柱)防撞装置成本高、占用空间大、延性低、抗腐蚀能力弱的不足,提供一种分离式桥墩防撞系统,具有很好的吸能效果、可更换、维修成本低、环保等优点。The invention aims at the disadvantages of high cost, large space occupation, low ductility and weak corrosion resistance of the existing pier (column) anti-collision device, and provides a separate pier anti-collision system, which has good energy absorption effect and can be replaced. , low maintenance costs, environmental protection and other advantages.
为实现本发明的目的,可采用如下技术方案。In order to achieve the object of the present invention, the following technical solutions can be employed.
一种分离式桥墩防撞系统,包括防撞本体,防撞本体设置在桥墩柱外围并通过焊接加工固定在预埋在承台上的钢板,其特征在于,所述防撞本体包括空气隔离层,内护筒,缓冲层和防撞层;所述空气隔离层包裹桥墩柱,所述内护筒包裹所述空气隔离层,所述内护筒外围设有缓冲层,所述缓冲层外围包覆有防撞层;所述防撞本体的底端通过与承台上预埋的钢板焊接实现固定连接。A separate bridge anti-collision system includes an anti-collision body, and the anti-collision body is disposed on a periphery of the pier column and fixed to the steel plate pre-buried on the cap by welding, wherein the anti-collision body comprises an air isolation layer The inner casing, the buffer layer and the anti-collision layer; the air insulation layer wraps the pier column, the inner casing encloses the air insulation layer, and the inner casing is provided with a buffer layer, and the buffer layer is surrounded by a buffer layer The anti-collision layer is covered; the bottom end of the anti-collision body is fixedly connected by welding with the pre-buried steel plate on the cap.
进一步地,所述内护筒为不锈钢构件,所述桥墩防撞系统采用不锈钢为内护筒材料,不锈钢变形性能好,具有一定的厚度、抗腐蚀等性能。Further, the inner casing is a stainless steel member, and the anti-collision system of the pier adopts stainless steel as an inner casing material, and the stainless steel has good deformation performance, and has certain thickness and corrosion resistance.
进一步地,所述缓冲层为聚丙烯泡沫构件,所述桥墩防撞系统采用聚丙烯泡沫塑料为缓冲层材料,具有可回收,吸收冲击能量的能力,稳定性好,耐腐蚀性强,无毒、无味等特性。Further, the buffer layer is a polypropylene foam member, and the bridge anti-collision system uses polypropylene foam as a buffer layer material, has the ability to recover and absorb impact energy, has good stability, strong corrosion resistance, and is non-toxic. , tasteless and other characteristics.
进一步地,所述防撞层为泡沫铝构件,所述桥墩防撞系统采用泡沫铝作为防撞材料,具有高吸收冲击能量、耐高温、防火性能强、抗腐蚀、隔音降噪、导热率低、易加工、易安装、成形精度高、可进行表面涂装等特性。Further, the anti-collision layer is a foam aluminum component, and the pier anti-collision system uses aluminum foam as a collision avoidance material, and has high absorption impact energy, high temperature resistance, strong fire resistance, corrosion resistance, sound insulation and noise reduction, and low thermal conductivity. It is easy to process, easy to install, has high forming precision, and can be surface coated.
本发明的有益效果为:本发明的结构使用在路面上(水面上)的桥梁时,当车辆(船)撞击到桥墩时,泡沫铝能够很好地吸收冲击能量,通过缓冲层的设置,能够进一步吸收能力同时地对车辆(船)起到减震和减速的作用,通过空气隔离层的设置,能够进一步减弱冲击能量,隔开了车辆(船)直接接触桥墩,能达到很好的效果。并且所述分离式桥墩防撞系统还具有可更换、维修成本低、环保等优点。The beneficial effects of the present invention are: when the structure of the present invention uses a bridge on a road surface (water surface), when the vehicle (ship) hits the pier, the aluminum foam can absorb the impact energy well, and the buffer layer can be disposed through the buffer layer. The further absorption capability simultaneously acts on the vehicle (ship) to reduce and decelerate. By setting the air isolation layer, the impact energy can be further weakened, and the vehicle (ship) is directly contacted with the pier, which can achieve good results. Moreover, the separate pier anti-collision system has the advantages of being replaceable, low maintenance cost, and environmental protection.
图1为一种分离式桥墩防撞系统的俯视图。Figure 1 is a top plan view of a separate pier anti-collision system.
图2为一种分离式桥墩防撞系统的正视图。Figure 2 is a front elevational view of a split pier collision avoidance system.
以下将结合实施例和附图对本发明的构思、具体结构及产生的技术效果进行清楚、完整地描述,以充分地理解本发明的目的、特征和效果。显然,所描述的实施例只是本发明的一部分实施例,而不是全部实施例,基于本发明的实施例,本领域的技术人员在不付出创造性劳动的前提下所获得的其他实施例,均属于本发明保护的范围。另外,文中所提到的所有联接/连接关系,并非单指构件直接相接,而是指可根据具体实施情况,通过添加或减少联接辅件,来组成更优的联接结构。本发明创造中的各个技术特征,在不互相矛盾冲突的前提下可以交互组合。The concept, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings in order to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The scope of protection of the present invention. In addition, all the coupling/joining relationships mentioned in the text are not directly connected to the components, but rather may constitute a better coupling structure by adding or reducing the coupling accessories according to the specific implementation. The various technical features in the creation of the invention can be combined and combined without conflicting conflicts.
参照图1~图2,一种分离式桥墩防撞系统,包括防撞本体,防撞本体设置在桥墩柱外围并通过焊接加工固定在预埋在承台上的钢板,其特征在于,所述防撞本体包括空气隔离层2,内护筒3,缓冲层4和防撞层5;所述空气隔离层2包裹桥墩柱,所述内护筒3包裹所述空气隔离层2,所述内护筒3外围设有缓冲层4,所述缓冲层4外围包覆有防撞层5;所述防撞本体的底端通过与承台上预埋的钢板焊接实现固定连接。1 to 2, a split type bridge anti-collision system includes an anti-collision body, and the anti-collision body is disposed on a periphery of the pier column and fixed to the steel plate pre-buried on the cap by welding, wherein The collision avoidance body includes an air insulation layer 2, an inner casing 3, a buffer layer 4 and an impact layer 5; the air insulation layer 2 wraps a pier column, and the inner casing 3 wraps the air insulation layer 2, the inner A buffer layer 4 is disposed on the periphery of the casing 3, and the buffer layer 4 is surrounded by an anti-collision layer 5; the bottom end of the anti-collision body is fixedly connected by welding with a steel plate embedded on the cap.
进一步地,所述内护筒3为不锈钢构件。Further, the inner casing 3 is a stainless steel member.
进一步地,所述缓冲层4为聚丙烯泡沫构件。Further, the buffer layer 4 is a polypropylene foam member.
进一步地,所述防撞层5为泡沫铝构件。Further, the collision avoidance layer 5 is a foamed aluminum member.
以上对本发明的较佳实施方式进行了具体说明,但本发明创造并不限于所述实施例,熟悉本领域的技术人员在不违背本发明精神的前提下还可作出种种的等同变型或替换,这些等同的变型或替换均包含在本申请权利要求所限定的范围内。The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments, and various equivalent modifications or substitutions can be made by those skilled in the art without departing from the spirit of the invention. These equivalent variations or alternatives are intended to be included within the scope of the claims.
Claims (4)
- 一种分离式桥墩防撞系统,包括防撞本体,防撞本体设置在桥墩柱外围并通过焊接加工固定在预埋在承台上的钢板,其特征在于,所述防撞本体包括空气隔离层,内护筒,缓冲层和防撞层;所述空气隔离层包裹桥墩柱,所述内护筒包裹所述空气隔离层,所述内护筒外围设有缓冲层,所述缓冲层外围包覆有防撞层;所述防撞本体的底端通过与承台上预埋的钢板焊接实现固定连接。A separate bridge anti-collision system includes an anti-collision body, and the anti-collision body is disposed on a periphery of the pier column and fixed to the steel plate pre-buried on the cap by welding, wherein the anti-collision body comprises an air isolation layer The inner casing, the buffer layer and the anti-collision layer; the air insulation layer wraps the pier column, the inner casing encloses the air insulation layer, and the inner casing is provided with a buffer layer, and the buffer layer is surrounded by a buffer layer The anti-collision layer is covered; the bottom end of the anti-collision body is fixedly connected by welding with the pre-buried steel plate on the cap.
- 根据权利要求1所述的一种分离式桥墩防撞系统,其特征在于,所述内护筒为不锈钢构件。A split pier collision avoidance system according to claim 1 wherein said inner casing is a stainless steel member.
- 根据权利要求1所述的一种分离式桥墩防撞系统,其特征在于,所述缓冲层为聚丙烯泡沫构件。A split pier collision avoidance system according to claim 1, wherein said buffer layer is a polypropylene foam member.
- 根据权利要求1所述的一种分离式桥墩防撞系统,其特征在于,所述防撞层为泡沫铝构件。A separate pier collision avoidance system according to claim 1, wherein the collision avoidance layer is a foam aluminum member.
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CN201710645008.7 | 2017-07-31 | ||
CN201710645008.7A CN107313375A (en) | 2017-07-31 | 2017-07-31 | A kind of separate type pier anticollision system |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112431123A (en) * | 2020-12-21 | 2021-03-02 | 湖北省交通规划设计院股份有限公司 | Pier anti-collision facility in scoured area and construction method thereof |
CN113914201A (en) * | 2021-10-28 | 2022-01-11 | 中铁建大桥工程局集团南方工程有限公司 | Rotatable pier anti-collision floating device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107313375A (en) * | 2017-07-31 | 2017-11-03 | 佛山科学技术学院 | A kind of separate type pier anticollision system |
CN108277762A (en) * | 2018-03-14 | 2018-07-13 | 佛山科学技术学院 | A kind of tunnel face anti-collision system |
CN111576344A (en) * | 2020-05-18 | 2020-08-25 | 浙江大学 | Bridge buffer stop and bridge |
CN115182284B (en) * | 2022-08-25 | 2023-07-14 | 江苏科技大学 | Anti-collision guardrail for vehicle |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040227051A1 (en) * | 2003-05-12 | 2004-11-18 | Bishop Lyndell Kevin | Floating structural object protection system |
US20070094816A1 (en) * | 2005-11-01 | 2007-05-03 | Roger Patten | Buoyancy stabilized pier |
CN201473946U (en) * | 2009-07-23 | 2010-05-19 | 江苏中矿大正表面工程技术有限公司 | Composite protective steel pile structure |
CN201546203U (en) * | 2009-11-20 | 2010-08-11 | 中煤第三建设(集团)有限责任公司 | Bridge pier anti-collision device |
CN103556591A (en) * | 2013-11-07 | 2014-02-05 | 中国科学院、水利部成都山地灾害与环境研究所 | Pier collision avoidance structural body and design method thereof |
CN206337526U (en) * | 2016-12-12 | 2017-07-18 | 中铁二十局集团第三工程有限公司 | A kind of anticollision device of pier based on foamed aluminium |
CN107313375A (en) * | 2017-07-31 | 2017-11-03 | 佛山科学技术学院 | A kind of separate type pier anticollision system |
CN207032110U (en) * | 2017-07-31 | 2018-02-23 | 佛山科学技术学院 | A kind of separate type pier anticollision system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201406662Y (en) * | 2009-05-13 | 2010-02-17 | 中交第一公路勘察设计研究院有限公司 | Flexible energy dissipation pier anti-collision safety device with composite structure |
CN101949138B (en) * | 2010-08-16 | 2014-06-11 | 西安中交土木科技有限公司 | Elastic-plastic steel-structured safety protection device |
CN103031817A (en) * | 2013-01-10 | 2013-04-10 | 江苏博泓新材料科技有限公司 | Honeycomb lattice enhanced type composite material double-cylinder structure and anti-collision system using same |
CN205907638U (en) * | 2016-07-23 | 2017-01-25 | 王景超 | Rectangle bridge girder and pier buffer stop |
-
2017
- 2017-07-31 CN CN201710645008.7A patent/CN107313375A/en active Pending
-
2018
- 2018-01-23 WO PCT/CN2018/073683 patent/WO2019024468A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040227051A1 (en) * | 2003-05-12 | 2004-11-18 | Bishop Lyndell Kevin | Floating structural object protection system |
US20070094816A1 (en) * | 2005-11-01 | 2007-05-03 | Roger Patten | Buoyancy stabilized pier |
CN201473946U (en) * | 2009-07-23 | 2010-05-19 | 江苏中矿大正表面工程技术有限公司 | Composite protective steel pile structure |
CN201546203U (en) * | 2009-11-20 | 2010-08-11 | 中煤第三建设(集团)有限责任公司 | Bridge pier anti-collision device |
CN103556591A (en) * | 2013-11-07 | 2014-02-05 | 中国科学院、水利部成都山地灾害与环境研究所 | Pier collision avoidance structural body and design method thereof |
CN206337526U (en) * | 2016-12-12 | 2017-07-18 | 中铁二十局集团第三工程有限公司 | A kind of anticollision device of pier based on foamed aluminium |
CN107313375A (en) * | 2017-07-31 | 2017-11-03 | 佛山科学技术学院 | A kind of separate type pier anticollision system |
CN207032110U (en) * | 2017-07-31 | 2018-02-23 | 佛山科学技术学院 | A kind of separate type pier anticollision system |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112431123A (en) * | 2020-12-21 | 2021-03-02 | 湖北省交通规划设计院股份有限公司 | Pier anti-collision facility in scoured area and construction method thereof |
CN113914201A (en) * | 2021-10-28 | 2022-01-11 | 中铁建大桥工程局集团南方工程有限公司 | Rotatable pier anti-collision floating device |
CN113914201B (en) * | 2021-10-28 | 2023-08-18 | 中铁建大桥工程局集团南方工程有限公司 | Rotatable pier anti-collision floating device |
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