To preassemble a timbering frame in a regularly polygonal shape on the ground, and to carry in the timbering frame through a manhole opening by folding it into a shape with a small width.
A timbering frame 2 of a timbering device 1 for supporting a back-filling material injected into a gap between an existing pipe K and a rehabilitation pipe L is formed by each rotatably coupling four mutually-adjacent unit frames 21 in positions corresponding to apexes of a regular octagon. The timbering frame is formed in a regularly octagonal shape which is rigidly connected by being subjected to inhibition of rotation of the mutually-adjacent unit frames 21, and folded into a shape with a width which enables insertion through a manhole opening by allowing rotation of the mutually-adjacent unit frames 21.
HOSOKAWA AKIRA
NOZAKI ZENJI
| JPH10121565A | 1998-05-12 | |||
| JPH047434A | 1992-01-10 | |||
| JP2008045728A | 2008-02-28 |