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一、概 况 五马岗大桥是宁怀(四会、广宁、怀集)公路跨越绥江的重要桥梁,全长328.34米。桥型为9孔双曲拱桥。西岸桥头是山岗,基岩由西向东倾斜。河床软土覆盖层一般厚达18～25米,而广岸桥台下软土厚达36米,施工时除西岸桥台是明挖基础外,其余全部采用钻孔桩基方案。其中1～5墩采用人工推钻60厘米的钻孔桩,其余6、7、8墩和广台初次试用100型手把式地质钻机施工。
I. Overview Wu Maogang Bridge is Ninghuai (Sihui, Quang Ninh, Huaiji) an important bridge across Suijiang Road, a total length of 328.34 meters. Bridge for the 9-hole double curved arch bridge. West Bank bridgehead is hillock, bedrock tilt from west to east. River bed soft cover is generally 18 to 25 meters thick, while the wide shore abutment soft soil up to 36 meters, except for the construction of the West Bank abutment is the basis of open cut, the rest of all the use of bored pile plan. Among them, 1 to 5 mounds were manually drilled with 60 cm bored piles, and the remaining 6, 7, 8 mounds and the first trial of 100 type hand-held geological drilling rigs in Guangzhou and Taiwan were constructed.