查询词典 bridge construction

Our country firstly put forward such design principle of Qinghai-Tibet railway engineering as "lower temperature actively, reduce the heat into the subsoil, and assure the heat stability of frozen earth for the quality stability of construction", creatively adopt such corresponding measures of frozen earth construction problem as: for the poor frozen earth developing section, line should avoid as possible;for the geology of ice at high temperature and unstable frozen earth zone, the method of bridge instead of subgrade shall be adopted;in subgradeconstruction, such facilities as heat stick, rubble ventilation subgrade , rubble ventilation berm, ventilation pipe subgrade and laying heat preservation board etc shall be adopted to raise the stability of frozen earth subgrade;during the excavation of bridge, culvert , foundation pit and scouring prevention trough, creatively adopt single-tooth knapper and solve the problem of frozen earth excavation;during the construction of bridge and culvert, durable concrete and three-step maintenance method are adopted to assure the outside and inside beauty of structure.

我国在世界上首次提出"主动降温、减少传入地基土的热量、保证多年冻土的热稳定性，从而保证修筑在上面的工程质量的稳定性"的青藏铁路工程设计原则，创造性地采取了解决冻土施工难题的相应对策：对于不良冻土现象发育地段、线路尽量绕避；对于高温极不稳定冻土区的高含冰量地质，采取"以桥代路"的办法；在路基施工中采用了热棒、片石通风路基、片石通风护道、通风管路基、铺设保温板等多项设施，提高冻土路基的稳定性；在桥涵基坑、挡水埝基槽开挖中，创造性地应用了单齿破碎器，解决了冻土开挖难题；在桥涵工程施工中，采用了耐久性混凝土，采用了三步养生法，保证了结构物内实外美。

Based on the differences between the design value and the survey of the bridge deck elevation in constructing the pre-stressed and so on working condition, the model parameters are identified by ANN, and the beam camber of different sections are given. The results demonstrated that the ANN is efficient and the theoretical results fit well with that of forecasting the beam camber in construction.In this thesis, aim to the beam axis shape be exactitude for design, the internal force of the beam be appeased by design request, the concept of modem cybernetics is applied, At the same time, the effecting parameter has collected. The paper build the ANN model in predicting the beam camber an construction and discuss indetail the extraction of inputting nodes information when quoting the fundamental principle of ANN model and introducing research process of the improved BNN. According to them, ANN is applied in the construction control of prestressed concrete continuous bridge. It is successful for used in the No. 4 bridge of Xiangfan bridge over-crossing Hanriver brideg. To predict the construction camber of by ANN method is useful and effective.

本文以大桥成桥线形满足设计要求和成桥内力控制在设计容许范围内为目的，运用现代控制理论的思想，引用神经网络基本原理，详细介绍BP神经网络的研究过程，从而建立预应力混凝土连续梁桥施工预拱度的神经网络模型，并详细讨论了模型的神经网络结点信息的提取，在工程实例的基础上进行了数值计武汉理工大学硕士学位论文算，数值表明，将神经网络应用于预应力混凝土连续梁桥施工控制，获得了满意的结果，在预应力混凝土连续梁桥施工控制技术研究方面，具有方便有效、精度高的优点，具有良好的应用前景。

Widely applies in petroleum pipeline, chemical industry, automobile, shipbuilding, boiler, electricity constructs, nuclear electricity, astronautics, war industry, industry installment, bridge construction weldings etc.

广泛应用于石油管道、化工、汽车、造船、锅炉、电建、核电、航天、军工、工业安装、桥梁建筑等行业的生产及野外工作

Widely applies in petroleum pipeline, chemical industry, automobile, shipbuilding, boiler, electricity constructs, nuclear electricity, astronautics, war industry, industry installment, bridge construction weldings etc.

广泛应用于石油管道、化工、汽车、造船、锅炉、电建、核电、航天、军工、工业安装、桥梁建筑等行业的焊接及野外工作

The success of Sui Fenhe cable-stayed bridge's construction control improves the technology level of the concrete cable-stayed bridge's construction control, solves the difficult problems of the long-span cable-stayed bridge's swivel erection construction and provides the valuable experiences for the long-span concrete cable-stayed bridge's swivel erection construction in the future.

绥芬河转体施工斜拉桥施工控制的成功，提高了混凝土斜拉桥施工控制的技术水平，突破了大跨度混凝土斜拉桥单点平铰水平转体施工的难题，为今后类似大跨度混凝土斜拉桥转体施工提供宝贵的经验。

In order to ensure the construction process safe and the bridge structure would reach its ideal state, lots of questions in its whole construction control and swivel ereetion construction control are discussed and studied.Firstly, based on the experiences about the cable-stayed bridge's construction control, do emulational anlysis to Sui Fenhe cable-stayed bridge by using the bridge analyzing program of BSAS and Dbridge, analyze the parameters' sensitivity, study the temperature effects, discern the relevant parameter's errors about construction control and optimize its construction state.Secondly, as an example of Sui Fenhe cable-stayed bridge's swivel erection construction control, present the design and construction techniques of simple point supporting and even articulation and level swivel erection for long-span cable-stayed bridge, study its load-bearing system, balance system, power system and adjustment system in detail, check its static stability on the state of swivel erection construction and monitor the whole swivel erection construction.

首先，在斜拉桥施工控制经验的基础上，用桥梁结构分析程序BSAS和Dbridge对绥芬河斜拉桥进行了详细的施工仿真分析，参数敏感性分析，温度效应分析，施工控制影响参数误差分析和结构施工状态的最优化控制；其次，以绥芬河斜拉桥转体施工控制为例，介绍了大跨度斜拉桥单点平铰水平转体设计与施工技术，详细研究斜拉桥单点平铰水平转体支承系统、平衡系统、动力系统和调整系统，并对本桥结构转体施工做静力稳定性验算及转体过程的监控。

He then demonstrated the practicality of steel cables in bridge construction.

然后他展示了实用性的实用性的绳索在桥梁工程。

Bridge construction with reinforced concrete and steel bar is applied widely in China.

1钢筋的腐蚀机理钢筋的腐蚀过程是一个电化学反应过程。

In practice of the suspension bridge construction control , the geom...

悬索桥施工控制在国内已有十余年的历史，仍存在各种不足。

During the period of construction by the cantilever erection construction method, bridge experiences not only the process of generating girder in the stage of T rigid frame, but also the process of system transformation, so bridge has experienced a great complex stress process, in order to ensure the security of bridge during the whole stage of construction, the stress control and geometry control must be made during the stage of construction of bridge.

近些年来，我国随着经济的快速增长，出现了建造大跨度桥梁的高潮，预应力混凝土技术的迅速推广应用以及建造预应力混凝土连续梁桥的各种先进施工方法应运而生，加快了桥梁的施工进度，使得预应力混凝土连续梁桥的跨越能力不断增大，悬臂拼装施工方法就是在这种背景下产生并发展起来的。

Graf, without question, is the greatest women's player in history.

格拉芙，现在，毫无疑问是女子网坛历史上最伟大的选手。

If not, you will have to look around at all your important data.

如果没有，您将需要检查所有的重要数据。