Telescoping device with lower supporting platform

The utility model relates to a building telescoping device provides a telescoping device with lower supporting platform, including two boundary beams that are located the expansion joint both sides, two the boundary beam sets up relatively, still locates two including pressing from both sides waterproof stripe between the boundary beam, in be provided with under the waterproof stripe with two two slides of boundary beam one -to -one, each the slide is by the correspondence the boundary beam is to another the boundary beam level is extended, and two the correspondence is kept away from to the slide the mutual coincide of tip department of boundary beam. The utility model discloses an in the telescoping device, two slides are for waterproof stripe provides vertical supporting in vertical direction, can avoid the rubble to get into the expansion joint clearance after, the wheel through the time rolled broken stone, the rubble extrudees waterproof stripe again, leads to waterproof stripe to drop from the boundary