| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enable a macroscopic bore displacement of a tunnel cross section to be always obtained with a measurement accuracy that is fully practically, and to enable a maintenance-free structure to be realized by using a simple mechanism. <P>SOLUTION: A system for measuring the bore displacement of the tunnel is provided, in which edge sections of rod-like displacement gauges 4<SB>11</SB>, 4<SB>16</SB>, 4<SB>21</SB>, 4<SB>26</SB>, 4<SB>31</SB>, 4<SB>36</SB>, 4<SB>41</SB>and 4<SB>46</SB>are coupled with respective base sections of support posts 42<SB>1</SB>-42<SB>9</SB>planted in a lining member 41 by using pins, and edge sections of rod-like displacement gauges 4<SB>13</SB>, 4<SB>14</SB>, 4<SB>23</SB>, 4<SB>24</SB>, 4<SB>33</SB>, 4<SB>34</SB>, 4<SB>43</SB>and 4<SB>44</SB>are pin-coupled with respective head sections of the support posts 42<SB>1</SB>-42<SB>9</SB>, and edge sections of rod-like displacement gauges 4<SB>12</SB>, 4<SB>15</SB>, 4<SB>22</SB>, 4<SB>25</SB>, 4<SB>32</SB>, 4<SB>35</SB>, 4<SB>42</SB>and 4<SB>45</SB>are pin-coupled with respective base sections and head sections of the support posts 42<SB>1</SB>-42<SB>9</SB>. Intersection coordinates of three rod-like displacement gauges are sequentially computed continuously, by using two known nodes at the lower edge section of the tunnel as basic points, based on signals from the rod-like displacement gauges 4<SB>11</SB>-4<SB>16</SB>, 4<SB>21</SB>-4<SB>26</SB>, 4<SB>31</SB>-4<SB>36</SB>and 4<SB>41</SB>-4<SB>46</SB>in response to their axial displacements, thereby measuring the changing state of the tunnel. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
