DE2740473C2 - Pre-compression device - Google Patents

Description

40

The invention relates to a pre-pressing device for producing underground channels, tunnels or the like according to the preamble of claim 1.

In order to drive into curves while pre-pressing or to correct course deviations from a predetermined course to be able to, the cutting ring forming the tip of a pre-compression device is movable with the one downstream of it Pipeline connected. The movable connection enables an angular position (tilting) of the cutting ring by a certain amount in any direction in which the pre-compression is to take place.

From DE-OS 20 20 320 a device for driving up tunnels, tunnels and the like. Known in which a front and a rear shield section are used, which are secured against each other by means of an anti-twist device are connected. This anti-rotation device consists of a in the manner of a sliding block designed support beam, which is attached to the corresponding counter-guide- * q gene of the rear support shield leads. The front shield section is opposite the rear shield section angularly movable; this is achieved by an intermediate shield between the two shield sections is switched on, which is resiliently supported on the front and rear shield section. Corresponding seals are required in the joint-like intermediate shield section.

From DE-AS 12 03 300 is a movable connection between the cutting ring and him downstream pipe section known for the aforementioned purpose. After this device is a jacking shield into three shield sections, namely a front, a middle and a rear shield section Two adjacent shield sections are each divided around an axis going through the center of the pipe arranged pivotably with respect to one another, the two axes running at right angles to one another. These Training enables the cutting ring formed by the first shield section to a certain extent to tilt in any direction, although with the pipe sections arranged for it, especially in the circumferential direction remains connected This device is in particular because of the additional central pipe section expensive to manufacture. There is also an additional slot on the circumference to the surrounding soil to be able to penetrate through the soil and water into the pipe string, and therefore to seal it is

The invention is based on the object, a movable connection between the cutting ring and to create the downstream pipe section that is inexpensive to manufacture and simple in construction

According to the teaching, this task is attached to claim 1 solved.

Due to the arrangement according to the invention, the aforementioned middle shield section is no longer required. the The webs attached to the jacket plate and the extension having a convex thickening are simple and inexpensive to manufacture fasteners that serve their purpose well.

The feature of claim 2 ensures a sufficient power transmission to the one hand Screw; on the other hand, the axis, which extends through the extension, together with the game of the The screw shaft in the transverse plate has sufficient angular mobility, in particular; n horizontal Direction.

After the training according to claim 3, the two connections are diametrically in the propulsion shield Places where they firstly do not get in the way and secondly in front of the already narrow space in the jacking shield Pollution are protected.

An embodiment of the invention is shown .schematically in the drawing and is described below described in more detail. It shows

1 shows a pre-compression device in a vertical longitudinal section,

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

Tig. 3 the unit III in an enlarged view and

FIG. 4 shows a partial section along the line IV-IV in FIG. 1 in an enlarged view.

The pre-pressing device to be pressed into the ground 2 from a Erdschachi 1 consists essentially from a cutting ring 3, which is movable in a manner to be explained with an ih.n in the pre-pressing direction 4 downstream pressure ring 5 is connected. Coaxially prefabricated concrete pipes close to the pressure ring 5 6 at. A channel, tunnel or the like. Is driven by a pressing station indicated by way of illustration 7 first put the cutting ring 3 and the pressure ring 5 together and then piece by piece the concrete pipes 6 in press the soil in until the desired length of the canal is reached.

Between the cutting ring 2 and the pressure ring 5 are hydraulic cylinder 8 in groups of two

»Arranged distributed in the circumference, their attachment from Is not shown for the sake of simplicity. The cutting ring 3 can be turned into the pressure ring 5 by means of the pressing cylinder 8 and the angle of this downstream concrete pipe string 6 can be adjusted. For this purpose, certain press cylinders 8 aaasge to a certain extent.

The movable connection 9 between the cutting ring 3 and the thin ring 5 is made by two on the pressure ring 5 attached cake sets 10 formed between two webs 13 firmly connected to the jacket plate 11 and forming a holder 12 engage. The webs 13 extend? in Vorpreßnchtung 4 as well as to the middle of the pipe string 14 out. The extensions 10 each have a spherically shaped thickening 15 with little play fits between the webs 13 (see Figure 3). Transversely through an extension 10 extends radially to Pipe string an axis 16 which is fastened in two cheek washers 17 screwed to the extension 10. Between the cheek washers 17 a screw 18 is held pivotably on the axis 16. The screw is durchfaüt in the direction of advance 4 between the cross plate 19 extending over the webs 13 and has a nut 20 on the face side. A flange? 1 in The cutting ring 3 is in alignment with the screws 18 each with an opening 22 into which the screws 18 the nuts 20 can dip.

During pre-pressing, aas soil 2 sets the cutting ring 3 not only oppose forces that are opposite to the pre-compression direction 4, but also force components, which act in the circumferential direction of the cutting ring 3 and twist it. This is especially true undesirable if the exact position of the cutting ring 3 is used for monitoring the direction of advance will. The configuration according to the invention creates an essentially rigid one in the circumferential direction Connection between the cutting ring 3 and the pressure ring 5. An adjustment of the cutting ring 3 in the The sense of tilting is, however, still possible to a certain extent in each direction, since the cutting ring 3 with its webs 13 move longitudinally on the extension 10 and around the center 23 of the convex Thickening 15 can rotate.

The connection described so far is sufficient for itself the pre-pressing off. On a fastening of the cutting ring 3 with the pressure ring 5 in the pre-pressing direction 4 can can be omitted because the Vorpreßdru «the cutting ring 3 and the pressure ring 5 hold together in this direction. Is also a connection in the pre-compression direction 4 desired, / .. B. for assembly reasons or as a limit point of the maximum adjustment of the cutting ring 3, then the screw 18 represents an advantageous connection that allows the cutting ring 3 to be in the above-described Way to be adjusted in any direction.

1 sheet of drawings

Claims (3)

Patent claims: 1. Prepressing device for producing underground channels, tunnels or the like. Using a controllable cutting ring upstream of a pipe section, which is connected to the pipe section is movably connected while preventing relative movement in the circumferential direction, in which the connection by at least two axially parallel to the inside of the jacket sheet between the cutting ring and the pressure ring extending projections is formed on one of these two connecting parts (Cutting ring, pressure ring) are attached and so attached to the opposite connecting part, from two at a distance from each other extending in the pre-pressing direction and towards the middle of the pipe string, existing brackets on the jacket sheet of one of the two connecting parts intervene that a relative movement of the connecting parts in Vorpreßrichiung is possible, thereby characterized in that the holder (12) is arranged on the jacket plate (H) and the Web (13) of the holder abutting throat of the extensions (10) is convex and opposite the Holders are rotatable in a plane tangential to the cutting ring. 2. Prepressing device according to claim 1, characterized in that transversely through the extension (10) an axis (16) extends radially, which ^{binds one of the connecting parts (cutting ring 3, pressure ring 5) in the advance direction (4) u} ; * <ide screw (18) through. 3. Prepressing device according to Ar pruch 1 and 2, thereby characterized in that two connections (9) are provided, which in a horizontal, through the pipe string center (14) lying plane.