高速铁路桥梁段接触网坠砣与声屏障基础避让措施研究

Study on Avoiding Measures of OCS Weight and Sound Barrier Foundation in High-speed Railway Engineering Bridge Section

针对温差较大地区高速铁路桥梁区段接触网下锚拉线、坠砣可能会与桥梁段声屏障H钢基座或竖墙产生干扰而限制接触网坠砣下降至桥梁面板极限状态问题,研究了现有金属声屏障单元板加长至2260 mm、设置加筋亚克力通透板、声屏障H型钢立柱加焊翼缘和腹板3种情况。通过结构检算,认为加宽声屏障H钢翼缘并焊接腹板未改变声屏障单元板标准长度和结构气动布局,整体结构强度未降低,方案采用标准长度隔声板能够解决上述干扰问题,但应注意对接触网基座及桥梁遮板声屏障预埋基础重新排列。若采用加长加筋亚克力通透板方案,声屏障H钢形式与现有通用图一致,声屏障单元板挠度、抗力问题理论上可以通过加强铝合金框厚度解决,但亚克力隔声板的使用会降低声屏障整体景观效果和降噪效果,但局部使用影响可控。研究认为对通用金属声屏障单元板加长的方案由于单元板板材受力检算受控因素较多,存在一定不确定性,在无试验检测数据的情况下不建议选用。

Aiming at the problem that the weight may interfere with the H steel base of the sound barrier in the bridge section of high-speed railway in the area where the temperature difference is large,thus limiting the weight of the catenary to descend to the limit state of the bridge deck,three situations of lengthening the existing metal sound barrier plate to 2260 mm,setting acrylic permeable plate and welding flange and web of H steel column of the sound barrier are studied.Through structural check and calculation,it is considered that the form of welded flange and web of H-shaped steel column of sound barrier does not change the standard length of sound barrier unit plate and structural aerodynamic layout,and the overall structural strength does not decrease.The scheme adopts the standard length sound insulation plate,which can solve the above interference problems,but attention should be paid to rearranging the catenary base and the embedded foundation of bridge folded plate sound barrier.If the scheme of lengthened reinforced acrylic permeable plate is adopted,the H steel form of sound barrier is consistent with the existing general drawing,and the deflection and resistance of sound barrier unit plate can be solved theoretically by strengthening the thickness of aluminum alloy frame.However,the use of acrylic sound insulation plate will reduce the overall landscape effect and noise reduction effect of sound barrier,but the local use influence can be controlled.It is considered that the scheme of lengthening the element plate of general metal sound barrier is not recommended in the absence of test data because there are many controlled factors in the stress checking calculation of the element plate.