韩太平



摘要:乌鲁木齐绕城高速公路改建段由于旧路寬度窄(原路面宽度只有10米),且交通量很大,施工期间乌鲁木齐市禁止大型车辆在河滩路和外环路通行,没有条件进行车辆分流,也不能封闭、中断交通。路基拼宽时开挖台阶后路面宽度更窄,只能勉强维持双向通行,在路面施工时不能采用半幅通铺的施工方法,导致路面产生纵向施工接缝。因此该段新旧路面结合部相对薄弱,路面质量的可靠性、耐久性无法保证,且在重载交通长期荷载作用下,势必会造成路面早期破坏,增加运营期间的维护费用。
关键词:新旧路面;补强;水泥浆;聚酯玻纤布
Abstract: Due to the narrow width of the old road (the original pavement width is only 10 meters) and the heavy traffic during the reconstruction of the Urumqi Ring Expressway, Urumqi prohibits large vehicles from passing on Hetan Road and Outer Ring Road during construction, and has no conditions to divert vehicles, and can not close or interrupt traffic. When the subgrade is widened, the width of the road surface is narrower after excavation of the steps, and it can only barely maintain two-way traffic. The construction method of half-width paving cannot be used during road construction, resulting in longitudinal construction joints on the road surface. Therefore, the junction of new and old pavements in this section is relatively weak, the reliability and durability of pavement quality cannot be guaranteed, and under the long-term load of heavy-duty traffic, it will inevitably cause early pavement damage and increase maintenance costs during operation.
Key words: new and old pavement;reinforcement; cement slurry;polyester fiberglass cloth
1 概况
乌鲁木齐绕城高速公路(东线)第三合同段改建段路面工程,设计对旧路K5+000~K17+000段两侧拼宽,原设计旧路K5+000~K9+990,K10+456~K11+000段旧路部分铣刨拉毛后加铺18cm沥青面层,K9+990~K10+456,K11+000~K17+000段及西山互通主线部分旧路挖除后加铺76cm路面结构层。
根据改建段边施工边通车的施工特点,第一步将两侧拼宽部分施工后,转换交通并对旧路部分进行铣刨处理或挖除后重新施工路面结构层。设计对路面施工接缝处理方案为开横向台阶搭接处理,路面施工接缝位置存在纵向施工缝,该结合部相对薄弱,不能满足路面结构的耐久性要求。
2 新旧路面补强施工流程
新旧路面补强施工流程如图1。
3 施工准备
3.1 材料准备
①水泥净浆:采用天山P.C32.5高效缓凝水泥加水拌制。②聚酯玻纤布:采用250g/m2规格的聚酯玻纤布用于基层与下面层之间;采用200g/m2规格的聚酯玻纤布用于下面层与中面层之间,目前材料已进场并检验合格。……