Compound nested formula stock that can stretch out and draw back

The utility model discloses a compound nested formula stock that can stretch out and draw back, compound nested formula stock that can stretch out and draw back includes: limit structure, first stock,second stock and elastic joining section, the one end of first stock with limit structure fixed connection, the other end with the one end nested contact of second stock, elastic joining section is located the inside of first stock, and both ends respectively with limit structure with the second stock is connected. The utility model discloses a be applicable to inflation soil district cutting side slope, both full play the flexible anchor rod stress characteristics of warping, engineering characteristic that the native cutting side slope of fully provided inflation " met the water inflation,the shrink of desiccating ", also protect the extending structure of whole stock system, formed a simple structure, simple to operate, long service life's structure. 本实用新型公开了种复合嵌套式能伸缩锚杆，所述复合嵌套式能伸缩锚杆包括：限位结构、第锚杆、第二锚杆和弹性连接部，所述第锚杆