The present invention relates to a self-supporting expansion joint capable of simultaneous pouring and a construction method thereof.In the process of pouring concrete, a filler is fixed, and after that, the concrete is simultaneously poured to both sides of the pillar by allowing the contraction and expansion of concrete to be accommodated. It is intended to provide a self-supporting expansion joint device capable of simultaneous pouring and a construction method that enables rapid construction while preventing the deformation of the filler. The present invention for achieving the above object is composed of a horizontal plate placed on the bottom surface and having a plurality of installation holes formed thereon, and a vertical plate extending upward from one side of the horizontal plate, and are spaced apart from each other so that the vertical plate faces each other. A pair of supports located; A filler installed so as to be interposed between the vertical plates of the supports, and installed so that the upper end is formed higher than the height of the vertical plates of the supports to absorb deformation due to expansion and contraction; A filler cover installed to cover the filler exposed to the upper part of the vertical plate of the support to prevent deformation of the filler due to lateral pressure of the concrete and removed after the concrete is placed; And a fixing part installed on the floor through the installation hole of the horizontal plate to fix the support in the process of pouring concrete, and to allow the support to move in the horizontal direction by contraction and expansion of the concrete. The technical gist of the self-supporting expansion joint that can be simultaneously poured and its construction method.
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