用山洞作摆房可使其年温变化很小,又可大大降低地面干扰。但是,必须在施工前考虑防水防潮问题。大连地震台山洞摆房采取离壁被覆,墙壁、地面和拱顶全部用氯化铁防水混凝土和氯化铁防水砂浆施工。仪器墩也用氯化铁防水混凝土浇灌。为防止内外温差产生结露水,摆房过道安装了五道密封防护门,引出摆线的钻孔,上面采用保温密封, Use the cave as a pendulum can make its annual temperature change is small, but also greatly reduce the ground disturbance. However, waterproofing and moisture protection must be considered before construction. Dalian Seismological Station Hill Wharf to take off the wall covering, walls, floors and vaults all with ferric chloride waterproof concrete and ferric chloride waterproof mortar construction. Instrument pier is also waterproofing with ferric chloride water. In order to prevent the temperature difference between inside and outside to produce dew condensation water, set up five aisle sealing aisle to protect the door, leads to the trochoid drilling, above the insulation seal,