| 摘要 |
The boring screen for horizontal or small incline boring has the main part of the screen and the protective frame. The main part of the screen has screen rods, located in a circle of the boring screen, and a screen wire, rolled-up on the screen rods. The protective frame has protective rods, located in the circle of the outer part of the screen wire and going in the direction of the boring screen, annular elements for rod fastening and a protective wire, rolled-up round the protective rods. When the boring screen, equipped in the boring by force, overpasses the curved part of the boring, the protective frame slides on the wall of a curved part, also protecting the screen wire. There is a gap of standard size between the protective rods and the outer surface of the main part of the screen, moulded in such a way that, after setting the gap in a suitable way, the screen wire crosses the curved part of the boring, not coming into contact with the protective rods, or, if it still comes into contact with the protective rods, the screen wire is not damaged on the side of protective rods. |
