WIDENING METHOD FOR EXISTING ROAD BRIDGE

PROBLEM TO BE SOLVED: To provide a highly safe and prompt widening method for an existing road bridge along an express highway and others, using a Pca wall balustrade having a plurality of loop reinforcement that serves as a joint reinforcement, especially at a lower edge part.SOLUTION: A new road floor slab 2 is installed adjacent to an existing road floor slab 1. A new Pca wall balustrade 4 is installed temporarily on a side closer to a driving lane than an existing wall balustrade 3 on the road floor slab 1, as a temporary protective fence used during removal work of the existing wall balustrade 3. After removing the existing wall balustrade 3, the Pca wall balustrade 4 is moved to an outside edge part of the new road floor slab 2 and actually installed. A Pca wall balustrade having a plurality of loop reinforcements 8 at a lower end is used as the Pca wall balustrade 4, the loop reinforcements serving as a joint reinforcement. The Pca wall balustrade 4 is fitted temporarily on the existing road floor slab 1, with a plurality of joist members 5 in between.SELECTED DRAWING: Figure 3 【課題】高速道路などの道路橋の拡幅を、特に下端部に継手筋となる複数のループ鉄筋を有するPca壁高欄を用いてきわめて安全にかつ迅速に行えるようにした既設道路橋の拡幅方法を提供する。【解決手段】既設道路床版１に隣接させて新設道路床版２を敷設する。道路床版１上の既設壁高欄３より走行路線側に、既設壁高欄３を撤去する間の仮設防護柵として新設のPca壁高欄４を仮付けする。既設壁高欄３を撤去した後、新設道路床版２の外側の端部にPca壁高欄４を移設して本付けする。Pca壁高欄４には下端部に継手筋となる複数のループ鉄筋８を有するPca壁高欄を用いる。Pca壁高欄４は既設道路床版１の上に複数の根太材５を介在させて仮付けする。【選択図】図３