论异节拍流水施工中流水工期差异的实质

基于异节拍流水施工可以按照不窝工有间歇(即分别流水)或不间歇有窝工的形式组织,研究了异节拍流水施工中流水节拍产生两种流水工期差异的条件,及差异值与流水节拍值的关系。结果表明:流水工期差异为当m个施工段需要n道工序进行流水施工时,任意连续的3个流水节拍值中,若位于中间的流水节拍值为最小值,不窝工有间歇的流水工期(T)与不间歇有窝工的流水工期(T')的关系是T>T',并且其工期差值与3个连续流水节拍中的最小值和另一侧的流水节拍最大值的差值有关,是m-1的倍数;否则,T=T'。

关于流水步距和流水工期计算方法的讨论

提出适用于不同流水施工方式的流水步距和流水工期的统一计算方法,并通过计算实例的对比验证统一求法的正确性。

搭接与间歇对流水施工工期影响分析

阐述了在施工过程之间和施工过程内部施工段之间的搭接与间歇对组织流水施工工期的影响,供编制和审核施工进度计划时参考,对实际工作具有一定的指导意义。

施工组织设计全等节拍流水施工工期计算公式修正

目前无论是施工组织设计还是建设工程项目管理课程里,所有教材对等节奏流水施工工期的计算都是T=(mj+n–1)t+∑Z_(j,J+1)–∑C_(j,j+1)+∑G_(j,J+1),对该公式进行修正,可为今后编写教材提供有力论证。

矩阵法计算流水施工工期

简要分析了代数法、图上法在计算流水施工工期时存在的不足,提出了用矩阵法计算流水施工工期的方法.设计并分析了计算用表,说明了计算步骤,并用实例进行了验证.

基于逆流水步距组织分层无节奏流水施工

基于不分层时流水工期的定义公式,考虑了组织无节奏流水施工的关键约束条件,通过引入逆流水步距参数,推导出分层时无节奏流水的参数化工期模型,并以某5栋两层的别墅群为例编制了进度计划横道图.结果表明:该参数化工期模型可有效应用于分层时的无节奏流水,且与流水工期定义公式的参数结构吻合一致;在施工段数大于施工过程数的前提下,该模型有效表达了主导施工过程连续作业的关键约束性质;在层间工程量相同的前提下,该模型较好地体现出流水施工的节奏性、均衡性及专业性等特点.

一种流水施工组织方法

针对现有流水施工的组织安排方法还不够完善的问题,提出了一种基于施工段的流水施工组织方法。该方法将同一施工过程在不同施工段上开始的时间间隔作为流水步距进行组织施工。通过实例分析探讨了该方法下流水施工组织过程。结果表明,该流水施工组织方法在特定条件下可缩短施工工期,应用效果良好。

建筑流水施工时间参数分析

流水时间参数的确定与计算是组织建筑流水施工的重要内容之一。通过对流水时间参数的基本概念和常用计算方法的分析，指出了其中的不足与矛盾之处，提出了从概念上更趋合理的流水步距及流水工期的计算方法。

Assessment of Diversity, Distribution, Conservation Status and Preparation of Management Plan for Medicinal Plants in the Catchment Area of Parbati Hydroelectric Project Stage-Ⅲ in Northwestern Himalaya

The developmental activities, particularly the construction of hydroelectric projects are causing a great loss of biodiversity in the Indian Himalayan Region. The Himaehal Pradesh, a part of IHR is well known for the development of hydroelectric projects. The Parbati H.E. Project is amongst the major projects of the State. The different stages of the project are all causing loss of biodiversity of the area. Stage Ⅲ of the Parbati H.E. Project is a run of the river scheme on the Sainj River downstream of Power House of Parbati H.E. Project Stage Ⅱ. The project shall utilize regulated discharge of Parbati H.E. Project Stage Ⅱ and inflow of River Sainj for power generation, and has been contemplated as a peaking station operating in tandem with Stage Ⅱ. The present study has been undertaken to see the impact of hydroelectric project on the biodiversity, particularly on medicinal plants. A total of 104 species of medicinal plants, belonging to different life forms, i.e., trees （23 spp.）, shrubs （22 spp.）, herbs （57 spp.） and ferns （2 spp.） were recorded. The species have been analyzed and studied for their distribution, classification, altitudinal zones, part （s） used, indigenous uses, nativity, endemism and rarity.Different parts of these species, such as whole plants, roots （including rhizomes and tubers）, leaves, flowers, fruits, seeds, stems, barks, spikes, nuts and insect galls are used by the inhabitants for curing various diseases and ailments. 3o species are native to the Himalayan region, 9 species native to the Himalayan region and adjacent countries also and 65 species are non-natives. 9 species are near endemics. Considering the whole Himalaya as a biogeographie unit （sensu lato）, the near endemics are endemic to the Himalaya. Among these species, Zanthoxylum armature is categorized as Endangered and Valeriana wallichii as Vulnerable. Hedychium spicatum, Rhus javanica, Berberis lycium, Thalictrum foliolossum, Salvia lanata, Rubia cordifolia and Bergenia ligulata may be considered as threatened species due to their over exploitation for trade. 90 species are propagated by seeds, 8 species by seeds and rhizomes/roots/tubers, 4 species by seeds and cuttings, and 2 species by sori. A management plan for the cultivation and conservation of the medicinal plants in the dam submergence area, and the commercially viable medicinal plants with high value in the catchment area is suggested.