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厉害了!中国制造“变形金刚”攻克港珠澳大桥难题

2017-10-14 09:57:53   

央视网消息: 港珠澳大桥设计使用寿命120年,其中,路面的设计使用寿命为15年。在珠江口下游这样一个高温高湿高盐度的环境中,如何让路面的耐久性发挥最大的作用,是大桥建设者们攻关的重点。为此,海底隧道的铺装作业,工程人员就创新使用了一种由我国自主设计制造的超大型摊铺机来解决这一难题。

记者介绍身后的路面铺装机

中国制造路面铺装机宽度可任意调节

记者张雷报道称,我身后这个设备就是为港珠澳大桥海底隧道量身定做的路面铺装机,这个铺装机还有一个非常形象的外号,它的名字叫变形金刚式超大型路面铺装机。它可以最窄达到12米,最宽达到20米,在12米到20米之间进行自由动态调节。

港珠澳大桥隧道路面宽度为12.5米,但隧道入口处宽度却为15.5米,而桥梁和人工岛连接处更是达到了19.5米。这样不同规格的路面铺装,如果使用传统的摊铺方法,要用两台摊铺机同时作业,这样不仅均匀度会有所下降,而且双机并行铺装时所产生的接缝将会是未来耐久性的重要隐患。

港珠澳大桥岛隧工程路面铺装机设计师綦开隆

港珠澳大桥岛隧工程路面铺装机设计师綦开隆说,它的最大特点是一台机子代替了两台机子,整幅一次摊铺。国内外多数的路面都是用双台机器并机摊铺的,并机摊铺不可避免的是有条接缝。 破坏了原来材料的均匀度,容易形成车辙,塌陷,影响路面的寿命。

二次拌合装置

此外,为解决超宽摊铺过程中沥青拌合不均匀的问题,工程人员给这个超大型摊铺机在摊铺过程中加入了二次拌合的装置。

港珠澳大桥岛隧工程路面铺装机设计师綦开隆说,这个叶片是强制挤压式输料,卸料的时候大料滚落堆在边上,也就是过来的料它是不均匀的,我们的材料把不均匀的料通过二次搅拌再挤压过去,解决摊铺均匀问题。

两台并行铺装变为一次性全幅整体铺装,这样一来,既解决了平整度和拌合不均问题。同时也将效率大大提高。目前,此种路面摊铺设备已经在全国多条高速公路及特种超宽公路铺装中使用。

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