由国家建委建筑机械研究所设计,北京市机械施工公司修配厂和机械施工公司第五施工处制造的CH20振动沉桩锤,经过了六年多工业考核。考核期间,在第五施工处参加下进行了修改和性能测试,共运转了1470多小时,曾在北京、天津和唐山地区沉制了混凝土灌注桩、砂桩和灰土桩共计16000多根。实践证明该锤结构设计基本合理,简单紧凑,性能良好,振动参数基本满足使用要求,并于1980年10月通过国家鉴定,为我国建筑机械提供了一种中型的振动沉桩设备。该锤与相应的履带式桩架或轨道式桩架配 Designed by the Institute of Construction Machinery of the State Construction Commission, the CH20 vibratory pile hammer manufactured by the Beijing Machinery Construction Co., Ltd. and the Fifth Construction Department of the Machinery Construction Co., Ltd. has undergone more than six years of industrial assessment. During the assessment period, modifications and performance tests were conducted under the participation of the Fifth Construction Department. The total number of operations was more than 1,470 hours, and more than 16,000 concrete piles, sand piles, and lime soil piles were submerged in Beijing, Tianjin, and Tangshan areas. Practice has proved that the hammer structure design is basically reasonable, simple and compact, good performance, vibration parameters to meet the basic requirements of use, and in October 1980 through the national appraisal, for China’s construction machinery to provide a medium-sized vibration sinking equipment. The hammer is equipped with a corresponding track-type or track-type pile frame