REMOVAL METHOD FOR PLATE MEMBER FOR FORMING JOINT PART

To provide a removal method for a plate member for forming a joint part, which can efficiently remove the plate member by allowing support reaction force to be obtained in stable conditions by a simple constitution when pulling out the plate member.SOLUTION: A plate member 15 for forming a joint part of a crown part 59 is removed by an extraction method using a wedge member 67, and the plate member 15 of a side wall part 55 is removed by an extraction method using a rod-like member 61. The extraction method using the wedge member 67 extracts the plate member 15 to the inside of a divided form body part 3A, 3B by relatively displacing the same to the inside of the divided form body part 3A, 3B relative to a reaction force plate 66 by driving the wedge member 67 to wedge engaging holes 65, 66a in the state where a plate-side wedge engaging hole 65 is placed to overlap a reaction force-side wedge engaging hole 66a such that it shifts outward in the radial direction.SELECTED DRAWING: Figure 7 【課題】目地部形成用プレート部材を引き抜く際の支持反力を、簡易な構成で安定した状態で得られるようにして、効率良く撤去できる目地部形成用プレート部材の撤去方法を提供する。【解決手段】クラウン部５９の目地部形成用プレート部材１５は、クサビ部材６７を用いた引抜き方法によって撤去され、側壁部５５の目地部形成用プレート部材１５は、棒状部材６１を用いた引抜き方法によって撤去される。クサビ部材６７を用いた引抜き方法は、反力側クサビ係合孔６６ａに対してプレート側クサビ係合孔６５が、径方向外側にずれて重なり合うよう配置された状態で、これらのクサビ係合孔６５，６６ａにクサビ部材６７を打ち込むことにより、目地部形成用プレート部材１５を反力板６６に対して分割型枠本体部３Ａ，３Ｂの内側に相対的に変位させて、分割型枠本体部３Ａ，３Ｂの内側に引き抜くようになっている。【選択図】図７