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建设部4月25日发布九项部标准,于1984年5月1日开始实施。其标准代号和名称如下JJ19—84《建筑机械座椅》;JJ20—84《灰浆搅拌机技术条件》;JJ21—84《混凝土搅拌机型式、基本参数》(代替 JB1536—75);JJ22—84《混凝土搅拌机技术条件》(代替 JB1537—57);JJ23—84《预应力筋液压拉伸机——千斤顶》;
The Ministry of Construction issued nine ministry standards on April 25 and began implementation on May 1, 1984. Its standard code and name are as follows JJ19-84 “Construction Machinery Seats”; JJ20-84 “Technical Conditions of Mortar Mixers”; JJ21-84 “Concrete Mixer Types, Basic Parameters” (instead of JB1536-75); JJ22-84 “Concrete Mixer Technical conditions (instead of JB1537-57); JJ23-84 ”Prestressed tendons hydraulic stretching machine - Jack";