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斜立柱斜顶面斜地脚螺栓基础施工 被引量:2
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作者 蔡发荣 张玉庆 《科技信息》 2012年第26期347-348,共2页
华东送变电工程公司负责承建的750kV金-酒-安输变电工程线路八标段位于甘肃省嘉峪关市,本文对工程上新出现的8个地脚螺栓的斜立柱斜顶面斜地脚螺栓基础施工的方法进行分析总结,为今后此种形式的基础施工提供一种有效的施工方法。
关键词 750kV金酒安线 立柱斜顶面地脚螺栓基础 根开控制
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斜柱斜顶面斜地脚螺栓基础施工技术
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作者 杨建东 《工业建筑》 CSCD 北大核心 2013年第10期112-116,共5页
哈密南—郑州±800 kV特高压直流输电线路工程甘肃段部分基础采用斜柱斜顶面斜地脚螺栓基础,此种基础对尺寸精度比传统的直柱地脚螺栓基础要求高、施工技术比传统的直柱地脚螺栓基础困难。通过设计给定的数据精确计算钢筋及模板尺寸... 哈密南—郑州±800 kV特高压直流输电线路工程甘肃段部分基础采用斜柱斜顶面斜地脚螺栓基础,此种基础对尺寸精度比传统的直柱地脚螺栓基础要求高、施工技术比传统的直柱地脚螺栓基础困难。通过设计给定的数据精确计算钢筋及模板尺寸,合理确定混凝土配比及材料选择、模板固定、地脚螺栓固定、混凝土振捣,成立质量控制组对现场原材料及施工过程进行质量控制。施工中各工序紧密衔接、严格施工管控,确保工程质量,工程质量满足设计及现行规范要求。 展开更多
关键词 斜顶面 地脚螺栓 施工技术 质量控制
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Composite active control system of roof and side truss cable for large section coal roadway in fold coal pillar area 被引量:5
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作者 Sheng-Rong XIE Er-Peng LI Fu-Lian HE Shou-Bao ZHANG Guang-Chao ZHANG Mao-Yu PANG 《Journal of Coal Science & Engineering(China)》 2013年第2期126-132,共7页
In order to solve the surrounding rock control problem of large section gangue replacement roadway under complicated conditions, this paper analyzed the impact to the roadway controlling produced by the geological con... In order to solve the surrounding rock control problem of large section gangue replacement roadway under complicated conditions, this paper analyzed the impact to the roadway controlling produced by the geological conditions such as high ground stress, folded structure tilted roof asymmetry and soft wall rock, and built the tilt layered roof structural mechanics model to clarify the increase span mechanism of the weak coal instability. Then, we proposed the combined control system including roof inclined truss cable, coal-side cable-channel steel and intensive bolt support. And then by building the structural mechanics model of roof inclined truss cable system, the support principle was described. Besides, according to this model, we deduced the calculation formula of cable anchoring force and its tensile stress. Finally surrounding rock control technology of large section roadway in fold coal pillar area was formed. Field practice shows that the greatest roof convergence of gangue replacement roadway is 158 mm and coal-side deformation is 243 mm. Roadway deformation is controlled effectively and technical support is provided for replacement mining. 展开更多
关键词 fold coal pillar area increase span mechanism roof inclined truss cable system coal-side cable-channel steel structural mechanics model
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Top coal flows in an excavation disturbed zone of high section top coal caving of an extremely steep and thick seam 被引量:8
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作者 Miao Shengjun Lai Xingping Cui Feng 《Mining Science and Technology》 EI CAS 2011年第1期99-105,共7页
Compared with gentle dip long-wall caving,the length of a working face in fully-mechanized top-coal caving for extremely steep and thick seams is short,while its horizontal section is high with increasing production.B... Compared with gentle dip long-wall caving,the length of a working face in fully-mechanized top-coal caving for extremely steep and thick seams is short,while its horizontal section is high with increasing production.But the caving ratio is low,which might result in some disasters,such as roof falls,induced by local and large area collapse of the top coal in a working face and dangers induced by gas accumulation. After the development of cracks and weakening of the coal body,the tall,broken section of the top coal(a granular medium)of an extremely steep seam(over 60°)shows clear characteristics of nonlinear movement.We have thoroughly analyzed the geological environment and mining conditions of an excavation disturbed zone.Based on the results from a physical experiment of large-scale 3D modeling and coupling simulation of top coal-water-gas,we conclude that the weakened top coal can be regarded as a non-continuous medium.We used a particle flow code program to compare and analyze migration processes and the movements of a 30 m high section top coal over time before and after weakening of an extremely steep seam in the Weihuliang coal mine.The results of our simulation, experiment and monitoring show that pre-injection of water and pre-splitting blasting improve caving ability and symmetrical caving,relieve space for large area dynamic collapse of top coal,prolong migration time of noxious gases and release them from the mined out area and so achieve safety in mining. 展开更多
关键词 Top coal flowsExtremely steep and thick coal seamHigh section top coal caving (HSTCC)Particle flow
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