辽宁省轮胎厂力车胎分厂办公楼建筑面积636．86m2，为4层砖混结构，毛五浅基础，基底坐落于粉质亚粘土层上。竣工后业主提出在走廊外墙外侧接建4层4间共316．86m2的楼房，成为L形平面（图1）。接建的难点在于：（1）沉降不匀，经计算新接建部分的最大沉降量可达80mm；（2）连接 The building area of ​​the office building of Liaoning Tire Factory Tire Tire Plant is 636.86m2. It is a four-story brick-concrete structure with five shallow hair bases and the base is located on a silty sub-clay layer. Upon completion of the project, the owner proposed to build 4 floors and 4 floors of a total of 316.86m2 of buildings on the outside of the outer wall of the corridor, forming an L-shaped plane (Figure 1). The difficulties in construction are: (1) Uneven settlement, the maximum settlement of the newly constructed part can be up to 80mm; (2) Connections