Double-layer anti-crack quick assembly type tire membrane

The utility model relates to the technical field of building construction, and discloses a double-layer anti-crack quick assembly type tire membrane, which comprises a whole bendable splice plate and an extension plate, the splice plate comprises a first layer plate and a second layer plate, the extension plate comprises a third layer plate and a fourth layer plate, and the third layer plate and the fourth layer plate are arranged on the first layer plate and the second layer plate respectively. Central holes are formed in the middle parts of the first layer plate, the second layer plate, the third layer plate and the fourth layer plate, and connecting pins are sleeved in the connecting ends of the splicing plates and the extension plates. The splicing plate is integrally bent, when the length is insufficient, rapid supplementary connection is conducted through the extension plate and the connecting pin, fixing is conducted along the shape of the foundation pit, concrete is poured into the splicing plate, con