Showing papers by "Erez N. Allouche published in 2000"
TL;DR: In this article, an industry survey was conducted to gain a better understanding of this multibillion dollar industry, which is relatively unfamiliar to many in the construction sector, and the results obtained from analyzing 49 survey responses from HDD contractors in the United States and Canada.
Abstract: Perhaps the fastest growing segment in the underground trenchless construction industry is horizontal directional drilling (HDD). Currently, in North America alone, there are 17 manufacturers of HDD rigs and accessories and thousands of horizontal drilling rigs that are owned and operated by several hundred dedicated HDD contractors as well as utility companies and large pipeline outfits. Applications of HDD span across the civil engineering spectrum from mineral and oil exploration to the installation of telecommunication cables. An industry survey was conducted to gain a better understanding of this multibillion dollar industry, which is relatively unfamiliar to many in the construction sector. This paper presents the results obtained from analyzing 49 survey responses from HDD contractors in the United States and Canada. Topics investigated include company profile (e.g., annual volume, areas of activities); type of projects performed (e.g., applications, value, duration, type of product installed); and bidding and estimating practices (e.g., productivity values in various formations, cost of installation). Current and future trends in the industry are identified and discussed.
107 citations
TL;DR: In this article, the authors present suggested practices for underground installations of pipelines and conduits using HDD technology, including contract considerations, contractor bid submission, site evaluation, preconstruction, drilling operations, drilling fluid collection and disposal, site restoration, construction, and postconstruction evaluation.
Abstract: In recent years, the utilization of horizontal directional drilling (HDD) in urban areas for the installation of telecommunication, utilities, or municipal services has experienced a rapid growth. The hazards and complexity of working in urbanized areas, together with the ever increasing volume of construction activities, make the development of suggested practices much needed for engineers and inspectors whose primary responsibility is to oversee the project to a safe and successful completion. This paper presents suggested practices for underground installations of pipelines and conduits using HDD technology. Written feedback from numerous consulting engineers, contractors, owners, and research institutions in North America were solicited in the development of this paper. Contracting and construction aspects of HDD projects including design rules-of-thumb are incorporated to provide designers with the necessary tools for enhancing the probability of a successful HDD project. Topics include contract considerations, contractor bid submission, site evaluation, preconstruction, drilling operations, drilling fluid collection and disposal, site restoration, construction, and postconstruction evaluation. Additionally, provisions for measurement and payment are presented and discussed.
27 citations
14 Feb 2000
20 citations
TL;DR: In this paper, the authors describe the design and testing of a new multiple-port sampler for collection of soil samples from directionally drilled boreholes, which uses a new methodology for horizontal sampling to improve costeffectiveness and sample quality.
Abstract: Sampling using horizontal directional drilling allows the collection of soil samples from suspected zones located beneath structures and other surface-subsurface obstacles. However, current horizontal sampling techniques are time consuming and thus expensive. This paper describes the design and testing of a new multiple-port sampler for collection of soil samples from directionally drilled boreholes. The device uses a new methodology for horizontal sampling to improve cost-effectiveness and sample quality.Key words: horizontal directional drilling, horizontal wells, design, remediation, site characterization, sampling.
3 citations
14 Feb 2000
TL;DR: Horizontal directional drilling as mentioned in this paper is a remotely guided drilling technique that makes it possible to drill horizontal boreholes over long distances along straight or curved profiles and alignments, which can be used to reach contaminants inaccessible by other methods.
Abstract: In recent years, a growing number of consultants and owners have considered the use of horizontal remediation wells as an alternative solution to the removal and containment of contaminants. Currently, engineers rely on complex systems of vertical wells or barrier wall systems which inject and/or extract subsurface water or vapor for on-site soil and ground water remediation. However, in sites containing fine-grained soil or wide spread contamination, numerous vertical wells are required to adequately treat the plume. Horizontal directional drilling makes it possible to install a single horizontal well to contact a much larger contaminated area. Because fewer wells are required, the cost of extraction and treatment over the life of the project may be substantially reduced, In addition, horizontal wells can be installed beneath buildings or environmentally sensitive areas, to reach contaminants inaccessible by other methods. Construction of such wells may be achieved using horizontal directional drilling, a remotely guided drilling technique that makes it possible to drill horizontal boreholes over long distances along straight or curved profiles and alignments. An overview of horizontal environmental well technology including discussion of the advantages and limitations of this technology is presented. Greater utilization of horizontal wells depends on the availability of design and construction guidelines. Parameters and design principles that should be considered in such installations are presented.
1 citations