Please use this identifier to cite or link to this item:
Title: Precise digital models for construction surveying of highway tunnels
Authors: Lam, Yau-wah Steve
Keywords: Tunnels -- Design and construction
Hong Kong Polytechnic University -- Dissertations
Issue Date: 2001
Publisher: The Hong Kong Polytechnic University
Abstract: The applications of tunnel surveying systems are, in general, restricted by technical, instrumental, economical and user-oriented conditions. The major technical problems are: (1) different coding and alignment systems have been proliferated among tunnel projects, (2) insufficient geometric models and representations for tunnel objects, (3) inadequate accuracy standards and tolerance criteria governing the surveying of geometric models for construction processes, and (4) incomplete understanding of the surveying techniques and computational geometry for the construction of highway tunnels. Therefore, this thesis describes the current state of the art surveying techniques and different boundary-based geometric modeling systems suitable for use with microcomputer computers to tackle the aforementioned technical problems in construction surveying of highway tunnels. These precise geometric modeling systems consist of Sweep models, Skinning models, Mesh models, combined Constructive Solid Geometry ( CSG ) and Boundary Representation ( B-Rep ) models, and computational geometry for irregular surfaces and tunnel intersections. While the Sweep models are commonly adopted in existing tunnel software, the other models are not adopted and are conceptualised and designed by the author for future applications in tunnel construction. The research involves the investigation of parametric models, data structures, algorithms, file formats and other technical information for creating, representing, and manipulating the precise geometric models of the physical parts of highway tunnels to expedite the surveying operations. Profitability is a product of highly efficient and cost-effective automation in construction surveying. The demand for high accuracy standards in tunnel surveying is highlighted by the increasing adoption of precast or prefabricated components for modem building structures, and the setting-out of computerized machines in driving tunnels. Therefore, these geometric modeling systems are adopted and being developed by the author to fulfill the requirements of the quality control system and accuracy standards in pursuit of such excellence and profitability in tunnel construction projects. Accuracy standards and codes of practice, which govern the accuracy of these geometric models, are investigated and summarized in this thesis. Finally, in order to inspect the overall geometrical deviations of a physical object in tunnel construction, the concept of geometrical tolerances and its applications are proposed by the author.
Description: xii, 193 leaves : ill. ; 30 cm.
PolyU Library Call No.: [THS] LG51 .H577M LSGI 2001 Lam
Rights: All rights reserved.
Appears in Collections:Thesis

Files in This Item:
File Description SizeFormat 
b16041963_link.htmFor PolyU Users 162 BHTMLView/Open
b16041963_ir.pdfFor All Users (Non-printable) 4.97 MBAdobe PDFView/Open
Show full item record
PIRA download icon_1.1View/Download Contents

Page view(s)

Last Week
Last month
Citations as of Feb 18, 2019


Citations as of Feb 18, 2019

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.