Means for displacing structures
阅读：841发布：2021-01-06
专利汇可以提供Means for displacing structures专利检索，专利查询，专利分析的服务。并且Means for displacing heavy structures such as a tunnel driving shield, a bridge span or a building comprises a plurality of hydraulic cylinders assembled in two or more groups, each group having its own hydraulic circuit.，下面是Means for displacing structures专利的具体信息内容。
1. In combination, a tunnel driving shield comprising an anchor frame and a driving frame interconnected for relative movement longitudinally of the frames, a plurality of elongate, sharp ended shield elements connectable selectively to each of said frames, and hydraulic means including a plurality of hydraulic jacks connected between said frames, said jacks being arranged in at least three groups, each of which groups is associated with a hydraulic system comprising a pump, a control valve, a pressure line extending between the pump and the control valve, a return line extending between the control line and a tank from which hydraulic fluid is drawn by the pump, a first supply line connecting the control valve and a first chamber of each of the jacks and a second supply line connecting the control valve and a second chamber of each of the jacks, the control valve being positionable to connect the pressure line to either of the said supply lines and the return line to the other supply line, to extend or retract the jacks as required, the resultant forces pertaining to each group of jacks acting along a line located at a position intermediate the endmost jacks in each group, the lines of force applied by the at least three groups of jacks being equally spaced around said shield.
2. The combination of claim 1, wherein the return line includes a throttle valve which is operable in accordance with the pressure in a pilot line connected to the pressure line, whereby a reduction in the resistance to the movement of the jacks results in a fall in pressure in the pressure line and consequent throttling of the return line to restore the resistance.
3. In combination, a tunnel driving shield comprising two relatively movable frames for supporting elongate shield elements, and a hydraulic system for advancing the shield comprising a plurality of cylinders connected betweeen the frames, the cylinders being grouped together and forming at least three groups, the cylinders of each group having a common pressure mediuM supply line so that the cylinders of each group operate together and independently of the other groups, each group applying to the shield a resultant line of force, the said resultant lines of force being spaced equally from the center of gravity of the shield.
4. The combination as claimed in claim 3, wherein the resultant forces applied by the various groups of cylinders are substantially equidistant from each other.
5. The combination as claimed in claim 3, wherein each group of cylinders has a separate pump and its own hydraulic circuit leading from said pump.
6. The combination of claim 5, wherein a return line from each group of cylinders includes a throttle valve operable by pressure in a pilot line connected to the circuit leading from the pump, whereby a reduction in the resistance to the movement of the cylinders results in a fall in pressure in the pressure line and consequent throttling of the return line to restore the resistance.
7. The combination as claimed in claim 3, wherein each group has a pressure fluid return line provided with a throttle valve.
8. The combination as claimed in claim 7 including a pilot line connected with the main pressure line and supplying pressure fluid to control the throttle valve.
9. The combination as claimed in claim 3, wherein the lines of resultant force are disposed at the apices of an imaginary triangle.
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