水下工程浇灌混凝上通常用沉箱法或者陆上预制、水下分段装配法。前者造价昂贵,后者运输困难,特别是要把预制构件在水下准确牢固地连接成一体,尤为困难。日本一家公司研制成功一种水泥新品种,利用它可在水下直接浇灌混凝土,也就是.既可在水面上直接施工,也可利用没入水中的储料箱进行水下浇灌注型工作,水并不影响浇灌施工过程。新品种水泥的秘密在于,每立方米普通水泥添加3～5kg 由多种纤维素化学衍生物构 Underwater engineering is usually used caisson or land prefabrication, underwater sub-assembly method. The former is expensive, and the latter is difficult to transport. In particular, it is particularly difficult to accurately and securely connect the prefabricated elements underwater. A Japanese company has successfully developed a new type of cement, which can be used to directly water concrete under water, that is, it can be used directly on the surface of the water, or it can use submerged storage tanks for underwater pouring and pouring. Does not affect the watering process. The secret of the new varieties of cement lies in the addition of 3 to 5 kg of cubic cement per cubic meter of ordinary cement.