Flexible heat insulation sleeve for embedded part of steel shell immersed tube tunnel and manufacturing method of flexible heat insulation sleeve

The invention relates to a steel shell immersed tunnel embedded part flexible heat insulation sleeve which comprises a main body and an inner container which are made of flexible fireproof heat insulation materials, the main body is provided with a first cavity with an open top and formed by four side faces and a bottom face, the inner container is provided with a second cavity with an open top and formed by four side faces and a bottom face, and the main body is not in contact with the inner container. The main body and the inner container are both provided with a plurality of through holes for bolts to penetrate through in a penetrating mode, and limiting pieces are installed between the matched through holes of the main body and the inner container, so that a distance is still kept between the flexible main body and the inner container after installation, the first cavity becomes an isolated space, and heat is better prevented from being transmitted inwards. The main body sequentially comprises the high-si