JOINT FORMATION METHOD AND FORMWORK STRUCTURE

To provide a joint formation method and a formwork structure that reduce adhesion between pre-cast concrete and post-cast concrete in lining concrete.SOLUTION: A joint forming method is a method of forming a joint 7A at a boundary between pre-cast concrete 11 and post-cast concrete 12 in lining conc...

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Main Authors WATANABE KENZO, AOYANAGI TAKAHIRO, HASHIMOTO MANABU, YANAI SHUJI, SAKATA NOBORU, TEZUKA YASUNARI, SAKAI GORO, MATSUMOTO SHUJI
Format Patent
LanguageEnglish
Japanese
Published 17.10.2022
Subjects
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
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Summary:To provide a joint formation method and a formwork structure that reduce adhesion between pre-cast concrete and post-cast concrete in lining concrete.SOLUTION: A joint forming method is a method of forming a joint 7A at a boundary between pre-cast concrete 11 and post-cast concrete 12 in lining concrete 3 of a tunnel 1, and comprises: a pre-casting step of constructing the pre-cast concrete 11 in which a first chamfered portion 11a is formed by a first wooden frame portion 13a; and a post-casting step of constructing the post-cast concrete 12 in which a chamfered portion 12a is formed by a second wooden frame portion 14a. In at least one of the pre-casting step and the post-casting step, a stepped portion 16 between the chamfered portions 11a and 12a is formed to cut off edges of the pre-cast concrete 11 and the post-cast concrete 12.SELECTED DRAWING: Figure 2 【課題】覆工コンクリートにおいて先打ちコンクリートと後打ちコンクリートとの付着を低減する目地部形成方法及び型枠構造を提供する。【解決手段】目地部形成方法は、トンネル１の覆工コンクリート３で先打ちコンクリート１１と後打ちコンクリート１２との境界部に目地部７Ａを形成する目地部形成方法であって、第１面木型枠部１３ａによる第１面取り部１１ａが形成された先打ちコンクリート１１を施工する先打ち工程と、第２面木型枠部１４ａによる面取り部１２ａが形成された後打ちコンクリート１２を施工する後打ち工程と、を備え、先打ち工程又は後打ち工程の少なくとも一方において、先打ちコンクリート１１の端部と後打ちコンクリート１２の端部との間を縁切りする、面取り部１１ａ，１２ａ同士の段差部１６が形成される。【選択図】図２
Bibliography:Application Number: JP20210062971