DE2748628C2 - Connection between a leading knife and a trailing knife of a knife shield - Google Patents

Description

a) between the leading knife (4) and the trailing knife (17) a link-like intermediate joint piece (18) is provided which is connected in an articulated manner (at 19) to the leading knife (4) and (at 20) to the trailing knife (Yl) ,

b) the directions of the axes (21,22) of the articulated connections (18) run tangentially to the shield jacket,

c) the distance between axes of the axes (21, 22) correspond at least to the size of the maximum Spreading of the jacking knife parts (4.17).

The invention relates to a connection between a Leading knife and a trailing knife of a knife blade according to the; Overriding the patent claim.

From the German disclosure documents 25 55 524 and 26 12 169 knife blades are known with propulsion knives that can be moved longitudinally and radially to the frame, which consist of leading and trailing knives, which have simple joints tangential to the shield circumference aligned joint axes are connected to each other. The trailing knives secure the excavation cross-section in the critical area between the rear end of the shoring shield and an extension. The purpose of the joint is the one that gives freedom of movement to the lead knife when spreading against the mountains to create the trailing knife. However, this configuration is only unsatisfactory for this purpose fulfill. When spreading the leading knife, especially in the trailing knife and in the rearward area the leading knife generates bending stresses which, if they assume a significant level, will remain so Can cause deformation of the knife.

The invention is based on the object of a connection between a feed knife and a To develop trailing knives of a knife shield in such a way that the leading and / or trailing knives are unhindered is or are spreadable against the mountains without it being in the leading and / or trailing knife creates harmful tension.

The object is achieved according to the features of claim 1. The compound according to the invention between μ see leading and trailing knife allows an unhindered Spreading the leading and / or trailing knife against the mountain without damaging it Tension comes.

An embodiment of the invention is shown below described using a simplified drawing. It shows

F i g. 1 a knife designed according to the invention

shield in vertical longitudinal section and

F i g. 2 shows a section along the line H-II in FIG. 1.

The in F i g. 1 shown knife shield consists in essentially of a frame, generally designated 1, on which the outside parallel to the propulsion axis 2 aligned, abutting, one the Support frame 1 surrounding shield jacket 3 forming lead knife 4. In the shield jacket 3 "ind the the front part 5 and the rear part 6 of the frame 1 are displaceable relative to one another. This is done by hydraulic cylinders 7 accomplished, which are arranged between the frame parts 5, 6 and held in two eyes 8 each are, which are evenly distributed on the facing end faces 9 of the frame parts 5, 6 are attached, Each leading knife 4 is assigned a feed cylinder 10 which is attached to a leading knife Attachment 11 engages and attaches to the rear frame part 6 is supported by means of an eye 12 attached to it. In addition, each lead knife 4 has two Spreader cylinders 13 assigned which are fastened in the frame parts 5, 6. The piston rods 14 of the spreader cylinder 13 protrude radially out of the frame parts 5, 6 and carry guide plates 15 on which the leading knife 4 are guided along the propulsion axis 2 by means of guides 16 formed thereon.

Each leading knife 4 is followed by a trailing knife 17, which is connected in an articulated manner to the former. The articulated connection consists of a tab 18 which has the same width b, F i g. 2 like those of the leading knife 4 and the trailing knife 17 and by means of joints 19, 20 with axes 21, 22 aligned tangentially to the shield circumference, a distance a from one another, connected on the one hand to the leading knife 4 and on the other hand to the trailing knife 17 The trailing knives 17 extend backwards up to a segment expansion 23, which they cover slightly or a little more depending on the lifting position.

In the following the function read knife shield described:

During the advance in the advance direction 24, the leading knife 4 and the respective connected thereto Trailing knives 17 are advanced individually or in groups by means of the feed cylinder 10. In FIG. 1 is that uppermost forward knife 4 shown in the advanced position. All leading knives that have not been advanced are in a spread position against the mountains. The spreading takes place by extending the Piston rods 14 of the spreader cylinder 13. The frame 1 is counteracted by means of the relevant forward knife 4 the mountains braced, whereby it, here in particular the rear frame part 6, forms an abutment which the feed cylinder 10 can be supported as the feed knife 4 is advanced. In contrast to the uppermost feed knife 4 in FIG. 1, the lowermost feed knife 4 is shown in a sprayed position has pressed itself under the pressure of the spreader cylinder 13 to a certain extent in the mountains. the Tab 18 follows the spreading movement by pivoting counterclockwise about axis 22. As a result, the trailing knife 17, apart from an insignificant component of movement in the advance direction 24, already mentioned, can be in its position remain.

After all of the feed knives 4 have been moved into the position shown in FIG. 1 position shown above have been advanced, the spreader cylinders 13 are retracted in the front frame part 5 and this is retracted by means of the hydraulic cylinders 7

j | moved forward in advance direction 24 by one stroke length || and tensioned again by extending the spreader cylinder 13 teren frame part 6 relaxed and this by acting on the hydraulic cylinder 7 in the propulsion direction 24 moved forward and again braced against the mountain by acting on the spreader cylinder 13 During this forward movement, the feed cylinders 10 are controlled so that they are retracted at the same time will. A new segment element can now be installed in the space bridged by the trailing knives 17 After this, a new work cycle can begin in the manner described.

In the context of the invention, it is also possible to design a knife shield in such a way that it is not as described above Embodiment the leading knife, but the trailing knife spreadable against the mountains is to be braced around the rear part of the frame in the mountains.

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Claims (1)

Claim: Connection between a leading knife and a trailing knife of a knife shield for the Driving tunnels, galleries and the like, whereby the The knife shield is provided with one or more frames on which the leading and trailing knives are located by means of thrust piston gears, longitudinally displaceable on the outside and opposite the or which the leading and / or trailing knives are radially movable, characterized by the following features: