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以某狭小场区超深基坑为例,详细的介绍了该项目的土方施工方案和各施工阶段相应的施工措施。探讨了利用常规运土车辆和挖掘机联合作业,通过多方面的施工措施完成了狭小场区基坑开挖的技术难题。通过妥善处理与支护施工交叉作业场地占用问题,分步分段进行开挖作业,优化布置场区内走向和坡度,合理安排好单步开挖深度及范围,采用分区块循环开挖的方法顺次推进,合理选择土方出运坡道的构筑材料,合理安排土方坡道改移作业时间,及时对坡道进行恢复,在最大限度的减少土方出运停歇时间的基础上,使场地内无坡道土方间歇期与支护施工各工序必要等待时间能够尽量协调一致。很好的保证了在狭小场地条件下按期完成既定土方施工计划,对今后同类项目的实施提供一定的帮助。
Taking the ultra deep foundation pit in a small area as an example, this paper introduces the earthwork construction scheme of the project and the corresponding construction measures in each construction stage. This paper discusses the technical problems of excavation of foundation pit in narrow area by means of joint operation of conventional soil-moving vehicles and excavators through various construction measures. Through properly handling and occupying cross-site occupation of construction site, step by step for excavation operations, the layout of the field to optimize the direction and slope, a reasonable arrangement of single-step excavation depth and scope, the use of sub-block cycle excavation method In order to promote the rational selection of construction materials for earth moving ramps, reasonably arrange the operation time of earth moving ramps, and timely recovery of the ramps, on the basis of minimizing the time for earthwork to be shipped out, The necessary waiting time of the earthwork between ramp earthwork and support construction can be as coordinated as possible. It is a good guarantee that the planned earthwork construction plan will be completed on schedule under small site conditions and will be helpful to the implementation of similar projects in the future.