小型雨水积蓄工程“水窖”的施工

本文介绍了一种集雨水窖的结构型式 ,施工方法 ,注意的问题 ,及资金和劳力的来源     

利用QPSO算法的装配式建筑项目工序优化方法

针对装配式建筑项目中工序的合理安排问题，提出一种基于量子粒子群优化(QPSO)的工序优化方法。首先对项目工序进行编码，使其能够以量子形式表示。然后，根据综合考虑施工工期和成本的目标函数，利用QPSO算法对工序方案其进行寻优，得到最优方案。另外，为了提高QPSO算法的收敛能力，融入了变异机制来避免其陷入局部最优。在一个装配式住宅项目案例中的实验结果表明：提出的方法能有效降低项目工期和成本，具有较高的实用价值。     

国家天文台FAST工程索网安装施工技术

国家天文台FAST工程索网安装共包括2225个主索节点、6670根主索和2225根下拉索,所有安装工作均需在空中完成,要求精度高,施工难度大。为了避免索网在安装过程中应力过大,并满足圈梁受力要求,施工过程中将整个索网对称等分为5个施工区域,每个区域都同步施工。施工时,需要采用大量悬空索道进行拼装,其中,施工通道为固定索道,需要承载较大受力,施工索道则随安装进度不断转移。     

Development of Novel Industrial Laminated Planks from Sweetgum Lumber

Industrial hardwood laminated planks were proposed, manufactured, and tested. The raw material was Number 2B common sweetgum lumber approximately 25?mm thick and 150?mm wide. The lumber was of random lengths and was assembled with nonstructural square endjoints. Waterproof phenol resorcinol formaldehyde adhesive was used to face laminate the lumber into 3.7?m long beams. Laminated beams were tested for modulus of rupture and modulus of elasticity and bending design values for the laminated beams were developed. The product of this research has applicability as member stock for bolt laminating into construction bridges and mats.     

浅析沉管灌注桩施工质量问题和处理措施

介绍沉管灌注桩及其特点,然后提出在沉管灌注桩施工中经常会遇到断桩、缩颈、管内混凝土拒落和桩尖虚脱等施工问题,根据具体的工程实例定性或者定量的分析原因,同时提出合理的处理措施,并且提出能较好解决这些质量问题的新工艺。     

铝包钢丝铸拉复合时温度场模拟计算

对边界条件进行了比较接近实际的假设，避免了在测定铸拉出结晶器前铸件表面温度或结晶器壁热流密度的难题。同时采用网格运动法计算了铸拉过程中铸件的温度场，计算结果十分令人满意。     

Analytical and Approximate Variance of Total Project Cost

The statistical variance of total project cost is usually estimated by means of Monte Carlo simulation on the assumption that exact analytic approaches are too difficult. This paper tests that assumption and shows that, contrary to expectations, the analytic solution is relatively straightforward. It is also shown that the coefficient of variation is unaffected by the size (floor area) of the project when using standardized component costs. A case study is provided in which actual component costs are analyzed to obtain the required total cost variance. The results confirm previous work in showing that the approximation of the second moment (variance) under the assumption of independence considerably underestimates the exact value. The analysis then continues to examine the effects of professional judgment, and, with the simulated data used, the approximation is shown to be reasonably accurate—the professional judgment absorbing most of the intercorrelations involved. An example is also given in which the component unit quantities are priced by their average unit costs and which again shows the approximation to be close to the true value. Finally, this is extended to show how the exact total project cost variances may be obtained for each project.     

Human Resource Data in the Construction Industry

Unionized construction workers in a major midwestern city were surveyed to collect data on education, training, experience, employment history, and a variety of other demographic variables. The characteristics of this local work force were analyzed and, where possible, contrasted with the data on the national construction labor force. The implications of the findings were discussed as they relate to the need for human resource planning in the construction industry. For example, the data indicated that younger workers are not joining unions in the same numbers as in the past. The anticipated result is a future shortage of skilled workers in the unionized sector of the industry, which has implications for construction productivity and for the funding of various worker benefits. The need for improved human resource planning was stressed.     

美国加州水工程建设管理概况和经验

美国加州水工程建设管理概况和经验王同生加州水工程是美国州政府建造的最大多目标水工程，工程包括水库、输水管、电站和泵站的蓄水和供水系统，计划安排的总工期达４０多年，边建设边发挥效益的历史已有３０多年。其建设资金的筹措、管理的方法、运行和维护经费的提供，...