Continuous protection device that connects of optical cable in pit

The utility model discloses a continuous protection device that connects of optical cable in pit, establish at the continuous outside outer joint pipe in position that connects of optical cable including the cover, outer joint pipe both sides set gradually the cover and establish and compress tightly cap, outer pressure testing pipe outside the second on the continuous outer -layer steel pipe who connects the position both sides of optical cable, compress tightly cap protective cap outside and outside first, outer joint pipe both sides still are provided with outer pressure testing pipe, the outer joint intraduct is provided with interior steel pipe fixing device, interior steel pipe fixing device establishes at the continuous position pipe that cracks on connecing optic fibre that to be continued that connects of optical cable including the cover to and set up respectively the connector that tub both sides, cover established on the continuous inlayer steel pipe that connects the position both sides of optica