GB1497544A - Tunnelling shields and like movable apparatus - Google Patents
Tunnelling shields and like movable apparatusInfo
- Publication number
- GB1497544A GB1497544A GB2550074A GB2550074A GB1497544A GB 1497544 A GB1497544 A GB 1497544A GB 2550074 A GB2550074 A GB 2550074A GB 2550074 A GB2550074 A GB 2550074A GB 1497544 A GB1497544 A GB 1497544A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shield
- axis
- optical guides
- tunnelling
- phototransistors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C7/00—Tracing profiles
- G01C7/06—Tracing profiles of cavities, e.g. tunnels
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
1497544 Sensing light beam deviation BALFOUR BEATTY Ltd 5 Sept 1975 [7 June 1974] 25500/74 Heading G1A [ Also in Division E1] A method of steering a tunnelling-shield along a predetermined path comprises directing a laser beam along, or in a direction parallel to or at a fixed angle with, the axis of the predetermined path of the tunnelling shield; focusing the beam on to the imput end of a group of optical guides carried by the shield, the imput ends of the optical guides being arranged in an array in which the position of the input end of each optical guide relative to that of another is fixed, and displaying light transmitted through the optical guides on to a screen at which the output ends of the optical guides are so arranged as to facilitate ready determination of any correction required to be applied to the motion of the shield. The output ends of the optical guides at the screen may be arranged either to identify a particular propulsion ram or rams to be and/or not to be operated or to form a magnification of the array of the input ends. Roll of the shield about its axis is compensated for by an extensible periscope assembly 24 pivotally mounted on the inlet end of a lens assembly 23 for movement about the axis of the lens assembly. Off-line and off-level deviation of the tunnelling shield is detected by rotating a pair of wedge prisms 27 about the axis of the lens assembly so that the laser beam, which is parallel to the predetermined path but displaced from its correct axis, is interrupted at intervals by the rotating prisms and is deflected on to phototransistors 26 lying in three concentric circles on a diaphragm 25. A comparator circuit associated with the photo-transistors of each circle amplifies and compares the voltage imputs from the phototransistors on opposite sides of the diaphragm and the net output is fed to the associated indicating instrument. In another embodiment the diaphragm carries a plurality of optical guides in concentric circles which are connected through phototransistors to bridge circuits feeding associated indicating instruments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2550074A GB1497544A (en) | 1975-09-05 | 1975-09-05 | Tunnelling shields and like movable apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2550074A GB1497544A (en) | 1975-09-05 | 1975-09-05 | Tunnelling shields and like movable apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1497544A true GB1497544A (en) | 1978-01-12 |
Family
ID=10228702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2550074A Expired GB1497544A (en) | 1975-09-05 | 1975-09-05 | Tunnelling shields and like movable apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1497544A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4273468A (en) * | 1978-03-23 | 1981-06-16 | Balfour Beatty Limited | Tunnelling shields and like moveable apparatus |
| EP0122103A1 (en) * | 1983-04-06 | 1984-10-17 | Hughes Douglas Harrison | Machine for boring tunnels |
| CN103541738A (en) * | 2013-09-27 | 2014-01-29 | 中铁第一勘察设计院集团有限公司 | Method for building extra-long tunnel independent construction control network |
| CN106761797A (en) * | 2016-12-24 | 2017-05-31 | 中铁十八局集团第四工程有限公司 | A kind of heavy grade curve shield driving vertical missing control and the method for correction |
-
1975
- 1975-09-05 GB GB2550074A patent/GB1497544A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4273468A (en) * | 1978-03-23 | 1981-06-16 | Balfour Beatty Limited | Tunnelling shields and like moveable apparatus |
| EP0122103A1 (en) * | 1983-04-06 | 1984-10-17 | Hughes Douglas Harrison | Machine for boring tunnels |
| CN103541738A (en) * | 2013-09-27 | 2014-01-29 | 中铁第一勘察设计院集团有限公司 | Method for building extra-long tunnel independent construction control network |
| CN103541738B (en) * | 2013-09-27 | 2015-07-29 | 中铁第一勘察设计院集团有限公司 | The method for building up of extra-long tunnel independent construction control network |
| CN106761797A (en) * | 2016-12-24 | 2017-05-31 | 中铁十八局集团第四工程有限公司 | A kind of heavy grade curve shield driving vertical missing control and the method for correction |
| CN106761797B (en) * | 2016-12-24 | 2019-08-09 | 中铁十八局集团第四工程有限公司 | A kind of method of heavy grade curve shield driving vertical missing control and correction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |