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首页> 外文会议>American Society of Civil Engineers(ASCE) International Conference on Pipeline Engineering and Construction v.2; 20030713-20030716; Baltimore,MD; US >Evaluation and Planning of Trenchless Sewer Alternatives in Venezuela
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Evaluation and Planning of Trenchless Sewer Alternatives in Venezuela

机译：委内瑞拉无沟渠替代方案的评估和规划

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摘要

The overall project presented consists of evaluation of existing infrastructure and planning the improvement/upgrading of regional potable water and sewerage systems for the coastal city of Barcelona, (near Puerto La Cruz) Venezuela, and the surrounding area. This presentation will focus on the wastewater system aspects assessed. The primary objective was to investigate the existing system and conceptually develop/evaluate alternatives for the collection and conveyance of wastewater flows in the Barcelona, VZ area. Background information was reviewed, as well as the technical framework necessary to determine the most viable wastewater collection and conveyance alternatives, and to effectively prioritize sanitary sewer collection system investigation and ultimate rehabilitation. Previous studies of the area had determined that, in general, existing collection and conveyance facilities had inadequate capacity. The central section of Barcelona's sewerage system dates back to the early 1950's. Since that time the system has gradually been extended to cover the majority of the urban areas. The system is generally characterized as in need of major rehabilitation and enlargement, primarily due to two factors; inadequate capacity as growth has exceeded the original design capacity of the collectors and inadequate maintenance, particularly at pumping stations in the system. Field reconnaissance consisted of visual research of various sections of the sewer system. The primary focus of the site investigations was primary collectors (interceptors), as well as relevant pump stations, to determine first order trenchless technology assessment for potential rehabilitation. For the most part primary collectors run 4 to 6 meters (13-16 ft) deep. A high groundwater table, 1 to 2 meters (3-6 ft) below grade, impacts new construction in the area. Additionally, this high groundwater condition also impacts O&M of the system. The principal characteristic of the local soil is a sandy type material which, when combined with the high groundwater table, creates a running sand mixture. In addition to infiltration flows entering the system through sewer or manhole defects, the running sand infiltration contributes not only increased liquid flow, but also increased siltation or sand buildups in the sewer. Project area conditions impacting the sewer system consist of high groundwater levels, wet/sandy soil excavations, narrow streets, and densely populated locality. Excavation and replacement of deteriorated sewers has historically been the most common method of system repairs. External repairs however, were not recommended due to site conditions, construction constraints and the availability of "trenchless" technologies for pipeline renovation. Trenchless rehabilitation alternatives highlighted included chemical grouting, cured-in-place lining, fold and form lining, sliplining, and pipe bursting.
机译：提出的总体项目包括评估现有基础设施，以及规划/改善委内瑞拉沿海城市巴塞罗那（在拉克鲁斯港附近）和周边地区的区域饮用水和污水处理系统。本演讲将重点介绍评估的废水系统方面。主要目的是研究现有系统，并在概念上开发/评估在VZ巴塞罗那地区收集和输送废水的替代方案。审查了背景信息，以及确定最可行的废水收集和输送替代方案以及有效优先考虑卫生污水收集系统调查和最终修复的必要技术框架。该地区以前的研究已经确定，总体而言，现有的收集和运输设施的能力不足。巴塞罗那污水处理系统的中央部分可以追溯到1950年代初。从那时起，该系统已逐渐扩展到涵盖大多数市区。该系统的一般特征是需要进行重大修复和扩建，主要是由于两个因素。容量不足，因为增长超过了收集器的原始设计容量，并且维护不足，尤其是系统中的泵站。现场侦察包括对下水道系统各个部分的视觉研究。现场调查的主要重点是主要收集者（拦截器）以及相关的泵站，以确定用于潜在修复的一阶非开挖技术评估。在大多数情况下，初级收集器的深度为4至6米（13-16英尺）。地下水位低于地面1至2米（3-6英尺）的高地下水位会影响该地区的新建筑。另外，这种高地下水位条件也会影响系统的运维。当地土壤的主要特征是沙质材料，当与高地下水位结合使用时，会形成流沙混合物。除了通过下水道或人孔缺陷进入系统的渗透流之外，流动的沙子渗透不仅有助于增加液体流量，还有助于增加下水道中的淤积或沙子堆积。影响下水道系统的项目区域条件包括地下水位高，开挖湿/沙质土壤，狭窄的街道和人口稠密的地区。从历史上看，开挖和更换老化的下水道一直是最常见的系统维修方法。但是，由于现场条件，施工限制以及管道翻新的“无节流”技术的可用性，不建议进行外部维修。重点强调的无沟渠修复替代方案包括化学灌浆，现场固化衬砌，折叠和成型衬砌，滑衬和管道爆破。

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