反铲挖泥船联合破石器开挖水下薄层风化岩施工工艺

Construction technology of underwater thin weathered rock excavation by backhoe dredger combined with stone breaker

针对工程量少、硬度较高的水下较薄风化岩层,采用自主改造和研发的反铲挖泥船结合钩状破石器作为疏浚设备的施工工艺,即利用钩状破石器对岩石进行预先破碎,然后反铲挖泥船再进行岩石开挖。结果表明:该施工方法既能有效开挖水下薄层风化岩、提高施工效率,又能控制成本、保证施工工期,取得了明显的经济效益和社会效益。适用于开挖岩层厚度薄,工程量少,岩体饱和抗压强度不超过20 MPa的水下强风化、中风化岩层。

In view of the thin weathered rock stratum underwater with small quantities and high hardness,the independently reformed and developed backhoe dredger combined with hook shaped stone breaker is used as the construction technology of dredging equipment,that is,to pre-break the rock with the hook shaped stone breaker,and then the backhoe dredger is used for rock excavation.The results show that the construction method can effectively excavate the underwater thin weathered rock,improve the construction efficiency,and can control the cost and ensure the construction period,and obtain obvious economic and social benefits.It is suitable for excavating underwater strongly weathered and moderately weathered rock stratum with thin rock stratum thickness,small quantities and saturated compressive strength of rock mass not more than 20 MPa.