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随着国家提高环境保护标准,企业投资建设的自来水厂与污水处理系统越来越多,建设标准不断提高。每个污水处理系统都需要配套系统,最主要就是水池,具有良好自防水性能的水池。但实际中受到各类因素影响,出现池体结构渗漏的问题。文中分析处理自来水厂池体结构渗透质量缺陷的措施。 相似文献
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某公司地下300t消防水池(长12.4m,宽8.4m)设计垫层为100mm厚C10混凝土,池体采用C25现浇混凝土结构,底板、壁厚均为200mm,抗渗等级P6。完成池顶板混凝土浇筑后即遇一夜暴雨,水池基坑内水位剧升,池体被托起上浮并发生偏移(图1)。1上浮原因分析(1)设计要求地下消防水池施工完成后须及时在池四周回填土,并在顶板覆盖500mm厚土,由于业主还需在池边安装管道,未能及时回土。(2)水池外设计允许最高地下水位在离水池底板以上1400mm处,突降暴雨后水池基坑内的水未能及时排出,水位上升距底板2m以上,池体自重难以抵抗水的浮力,造成池体上浮。(3)由于池… 相似文献
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钢筋混凝土水池在炼油化工建设中是一种应用极为广泛的构筑物,大量用于储存水、油污水等介质。最常见的如蓄水池、隔油池、中和池、曝气池、沉淀池、反应池以及消防水池等。池体的结构形式一般为矩形或圆形.但无论是矩形还是圆形,由于多种原因的变形、沉降所引起的池体结构裂缝是不可避免的。也就是说.在一般的情况下,裂缝的产生是难免的.但是要使池体结构裂缝严格控制在规范所允许的范围内,这要求每一个设计人员必须做一定的努力才能达到。 相似文献
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通过对600m3全埋式钢筋混凝土贮水池的质量事故现状进行仔细测量与检查、并结合地质情况和事故发生的经过,准确分析了贮水池上浮隆起出现结构裂缝的主要原因,在保留原水池的要求下,采取井点降水、压密注浆、贮水池增设钢筋混凝土内衬以及局部有针对性的采取防水修补的技术措施,使该水池基本复位,地基承载力达到原设计标准要求,池体贮水功能恢复正常。经过处理已投入使用5年至今运行正常无投诉。虽池体容积略有损失,但采取返修技术措施比返工重做节约25.6万元资金投入。 相似文献
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清水池是现代给水厂必要构筑物,也是确保水质和水量的重要环节。对于地下式或半地下式的清水池,地下水对池体的影响不容忽视,结构整体抗浮是必须考虑的重要环节。通常情况下,在水池抗浮方案选择中,抗浮锚杆常被作为首选。本文依托工程实例,介绍供水厂地下式现浇钢筋混凝土清水池抗浮锚杆施工技术。 相似文献
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基坑监测包括基坑支护结构应力及变位监测、周围建筑物沉降及地下水位观测、土体分层竖向位移监测、深层土体水平位移监测等等。本文结合工程实践,以泉州中芸洲海景花园城基坑工程项目深层土体水平位移监测为例,介绍处于复杂地质条件下的基坑深层土体水平位移监测成功经验,针对基坑深层土体水平位移监测进行分析总结,鉴于前人经验理论,总结深层水平位移曲线图的变化与支护结构类型等有关,特别与支撑点的设置有一定的关系,深层水平位移在有支撑点处的位移一般较没有支撑点处位移发展的慢,到后期深层水平位移曲线图会发展成"弓型"或"括弧型";在监测的过程中要结合现场实际情况来判断监测数据是否存在失真的可能性以及保证监测数据的准确性的措施等相关结论。 相似文献
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非开挖水平定向钻进技术是一项高新施工技术。本文介绍了水平定向钻进技术的基本原理及在污水管网建设中的应用。实践证明,非开挖水平定向钻进技术相对传统的开挖技术在特定条件下具有明显的优越性。 相似文献
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《Geotextiles and Geomembranes》2023,51(1):131-150
Increasingly waste materials or soft soil dredged from sea or river have to be used as fill materials for land reclamation. Although preloading using prefabricated vertical drains (PVDs) has been commonly used as the treatment method for soft soil, this method is time consuming as it can only be applied after all the fill materials have been placed. In this paper, a conceptual design for land reclamation using a horizontal drainage enhanced geotextile sheet (HDeGs) method combined with vacuum preloading is proposed. Large-scale model tests are carried out to verify the effectiveness of the HDeGs method. The proposed method is also compared with the existing prefabricated horizontal drain (PHD) method and the advantages and disadvantages of the HDeGs with vacuum preloading method are discussed. This study has demonstrated that the proposed HDeGs method is not only effective, but also more efficient compared with the PVD or PHD methods, as it can reduce substantially the construction time required for land reclamation. 相似文献
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水平位移基准线随机测站观测法 总被引:1,自引:0,他引:1
本文讨论了在建筑施工场地狭小、地面标志易遭破坏、地层尚不稳定的环境中进行水平位移变形观测的方法。它不设置固定的测站标志,不需仪器精确对中,而由随机设站测得边角观测值算出仪器设置中心对基准线的偏离距。 相似文献
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Provision of downward unidirectional clean air has been prevalent for decades in modern hospital operating rooms (ORs) to protect patients and surgeons from infectious airborne particles and has been found to be effective in reducing Surgical Site Infection (SSI), however, its shortcomings are inevitable. In this study we investigated an alternative of horizontal airflow pattern and the airflow performance in an OR with a dimension of 300 cm long, 296 cm wide and 240 cm high. We also evaluated the effectiveness of the horizontal unidirectional airflow to control infectious airborne particles through onsite test and computational fluid dynamics (CFD) simulation method. The investigation was focused mainly on the influence of the medical lamps and the thermal plume with different airflow patterns around the critical zone under the horizontal air supply system. Ultraclean air was supplied from a fan-filter unit. The patient and surgeon were assumed to be releasing 200 and 400 particles per minute, respectively. The results show that when the air supply and return facilities are installed on the same lateral wall to keep a state of horizontal flow ventilation in the OR, medical lamps and the thermal plume have no obvious influence on the horizontal airflow patterns around the critical zone in the OR, and performance of the air supply system is highly related to the relative position of the source to the wound. 相似文献
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本文就桩基的水平抗力问题作一浅析。认为水平外力要由地下室外墙(或承台、地梁)和桩共同承担。特别是在地震作用控制时,主要由前者承担。而桩主要用以承担竖向荷载。同时提出在基础设计、施工中应注意的几个问题。 相似文献