市政道路地下综合管廊基坑回填施工存在的问题及质量控制措施

采用城市市政道路位于地上、综合管廊位于地下的共建模式,用明挖法开挖综合管廊的基坑时,综合管廊的基坑回填完成后即形成了道路的路基。基坑的回填质量不仅关系着管廊主体结构的保护,还对其上方道路工程的施工质量有重大影响。文章以贵阳市某新建的城市道路和其下方新建的地下综合管廊为例,分析当前综合管廊基坑回填存在的问题及原因,结合现有工程案例,提出了基坑回填过程中的管理和质量控制措施,以控制预期质量。

渠道削模衬砌技术在泾惠渠灌区中的应用

近年来,各地对灌区水利工程建设的投入持续加大,大中型灌区对渠道衬砌的投入也在持续加大。大部分末级渠道衬砌都是以人工回填、人工削模等人工作业为主,配合U型衬砌机拉模。这种依赖人工作业的施工方式费时费力,误差也较大,断面大小不一、边角参差不齐,易产生局部渗漏及回填体不紧密的情况,以及人工回填需要为人工挖掘“让路”等问题。基于此,提出一种利用机械开挖切削的全断面回填方式,提升工作效率,可以有效防止上述问题的发生。结合工程的实际成效,论述此种技术的推广价值。以期为同类渠道衬砌作业提供实践经验。

Coupling mechanism of roof and supporting wall in gob-side entry retaining in fully-mechanized mining with gangue backfilling

We analyzed the deformation characteristics of overlying stratum in backfilling with fully-mechanized and retaining roadways along the gob area coal mining technology, and established a mechanical model for the roof key stratum of retaining roadways along gob under the conditions of backfilling and fully- mechanized coal mining technology. Using Winkler elastic foundation theory, we analyzed a part of the key stratum under the action of elastic foundation coupling problem, and derived deflection analyt- ical expressions. Combined with specific conditions, we obtained the deflection curves for the roof key stratum of retaining roadways along gob under the conditions of backfilling and fully-mechanized coal mining technology. On this basis, we adopted the Coulomb's earth pressure theory to solve the problem of lateral pressure of the gangue filling area on the supporting wall beside the roadway and to provide the theoretical basis for reasonable selection of the distance between gangue concrete wall and roof and fur- ther discussion on the supporting stability of roadway.

土地整理工程项目中渠沟施工方法

阐述了人力施工与机械化施工沟渠土方开挖及填筑的要点。