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  • 选择桥梁护栏要考虑的因素
  • 本站编辑:杭州楷高实业有限公司发布日期:2019-04-04 18:04 浏览次数:

桥梁的外侧和中分隔带必须设置梁护栏。桥梁护栏选择应考虑一下因素。

1、桥梁护栏的防撞性能,根据《公路交通安全设施设计细则》(JTG/TD81-2006)和《公路交通安全设施设计规则》(JTGD81-2006),选取的护栏形式在强度上必须能有效吸收设计碰撞能量,阻止相应失控车辆跃出桥外或者进入对向车道,并使其正确改变行驶方向。

2、受碰撞后的护栏变形程度受碰撞后护栏的最大动态变形量不赢超过可容许的变形距离。

3、环境和景观要求:

①钢桥应采用金属梁柱式桥梁护栏;

②对景观有特殊要求的桥梁宜选择梁柱式桥梁护栏或组合式桥梁护栏;

③积雪严重的地区,宜采用金属梁柱式或组合式桥梁护栏;

④为减少桥梁自重、减轻车辆碰撞荷载对桥面板的影响,宜采用金属梁柱式护栏;

⑤跨越大片水域的特大桥或桥下净空大于或等于10m时,宜采用组合式或钢筋混泥土墙式桥梁护栏;

⑥二级及以上等级公路小桥、通道、明涵宜采用与相邻的路基护栏同样的型式。

4、护栏的全寿命周期成本除考虑护栏的初期建设成本外,考虑投入使用后的养护成本。

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Beam guardrails must be installed on the outer and middle partition zones of bridges. The selection of bridge guardrail should consider some factors.

1. The anti-collision performance of the bridge guardrail. According to the "Rules for the Design of Highway Traffic Safety Facilities" (JTG/TD81-2006) and "Rules for the Design of Highway Traffic Safety Facilities" (JTGD81-2006), the selected guardrail form must effectively absorb the design collision energy in intensity, prevent the corresponding out-of-control vehicles from jumping out of the bridge or entering the opposite lane, and make them change the driving direction correctly.

2. The maximum dynamic deion of the barrier after collision exceeds the allowable deion distance.

3. Environmental and landscape requirements:

(1) Steel bridges should adopt metal beam-column bridge guardrails;

(2) Bridges with special landscape requirements should choose beam-column bridge guardrail or composite bridge guardrail;

(3) In areas with serious snow cover, it is advisable to adopt metal beam-column or composite bridge guardrail.

(4) In order to reduce bridge deadweight and the impact of vehicle collision load on bridge deck, metal beam-column guardrail should be adopted.

_When the clearance under the bridge is greater than or equal to 10m, the composite or reinforced concrete wall type bridge guardrail should be adopted.

(5) Bridges, passages and culverts of grade 2 and above highways should adopt the same type as adjacent roadbed guardrails.

4. In addition to the initial construction cost, the life-cycle cost of the guardrail should also consider the maintenance cost after it is put into use


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