Because lock tongue ACTS on wheel tooth from horizontal direction in the utility model, its force has little influence on horizontal rotary disc.
本实用新型由于锁舌从水平方向作用于轮齿，其作用力对水平的回转盘影响较小。
And once the horizontal well is liquid loaded, the horizontal section is likely to have water lock and gas lock which are obstacles to the output of gas.
且水平井一旦积液，在水平井段很容易产生水锁、气锁现象，阻碍天然气的产出。
Because of low vertical bearing capacity, especially horizontal bearing capacity, row-lock cavity wall has not enough bearing capacity, so that cracks are often found on row-lock cavity wall.
但由于空斗墙竖向承载能力和水平向承载能力都较低，空斗墙承载能力不足从而引起墙体开裂的情况时有发生。
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