DE3240361A1 - Pressure head for pipe driving - Google Patents

Abstract

In a pressure head for pipe driving in soils, with an annular body which has a cylinder group serving as pressure members for the pipe line and having actuating pistons, the annular body (1), in order to create a large driving stroke, is provided with a first group of pressure members (2, 3) and has a second group of pressure members (6, 7) whose part which is variable in length acts firmly on a pressure ring (8) on the same axis. <IMAGE>

Description

Printhead for pipe jacking

The invention relates to a print head for pipe jacking in the ground with a rinsing body, the one cylinder group serving as pressure members for the pipe string Has with actuating piston.

The known print heads for pipe jacking read by pushing them out the actuation piston exerts a feed force on the pipe string from the pressure cylinders. In the known print heads, the feeds are at most equal to the stroke length of the actuating piston to apply. As a result, the print head becomes more labor-intensive with short Ah levels Way to follow up and return the actuating pistons to their original positions are.

It is the object of the invention to provide a print head with a large stroke.

According to the invention it is provided for this purpose that the ring body has a first Group carries pressure members and has a second group of pressure members fixed The variable-length part firmly engages on a pressure ring with the same axis. To this Way, a pressure head for pipe jacking is created, which to a certain extent by double Telescoping the pressure member has a particularly large stroke. This leads to the frequent There is no need to adjust the print head, which also ensures faster pipe jacking is. In addition, the printhead allows the pipe string to be guided in a straight line, wherein in particular the pressure members arranged between the ring body and the pressure ring can counteract the rolling of the pipe string. Through appropriate activity the compression members, a torque can be exerted on the pipe string, so that changes in direction of the pipe string are made possible.

In an embodiment of the print head it is provided that the first group Pressure members with the ends facing away from the ring body on a common pressure plate are firmly supported while the second group of compression members in with the ring body Immerse firmly connected cup-shaped Au Enahmcn and into this with the pressure ring remote ends are supported and firmly connected. This leads to that the pressure members of both groups at least partially extend side by side and give rise to a short overall length of the printhead.

The first is provided in a further embodiment of the print head and the second group of pressure members by pressure cylinders with hydraulically displaceable To form plunger. But there is also the possibility of the first and the second Group of pressure members to be formed mechanically, for example by means of spindles. About that In addition, provision is made for a group of pressure members to be slidable by means of Huhylinders Plunger and the other group to help the flrtickcl i or by Sr) i nflel n.

A simplification of work is finally brought about by that the ring body nd / ocleXr the pressure ring connections for supply lines firmly exhibit.

This also eliminates the otherwise cumbersome short-term tracking the supply lines.

The invention is based on an exemplary embodiment in the drawing made clear. Herein show: FIG. 1 a print head in side view, partially in section, Figure 2 shows a section along the line II-II of Figure 1 and Figures 3 and 4 a print head in different working positions.

In the figures, 1 designates an annular body which has a number of printing cylinders 2 with actuating piston 3 firmly carries. The pressure cylinders 2 are with their the ring body 1 fixed ends facing away from a common pressure plate 4. Next points the annular body 1 cup-shaped receptacles 5 firmly in the pressure cylinder 6 with actuating piston 7 immerse, which firmly engage a pressure ring 8 which is plane-parallel to the ring body 1. The pressure cylinders 6 are firmly connected to the receptacles 5 at 9. The Druckrinq 8 acts as an abutment of a Flolzringes or wooden plate 10, which distributes the pressure Exercise on the pipe string 11. The pipe string 11 and the wooden ring 10 are through a Ring 12 guided radially on the pressure ring 8.

The print head is supported axially displaceably overall on rails 13, so that from time to time it is necessary to adjust the print head by moving it @eseben can be easily effected on the rails 1.

The printing cylinder 2 and the receptacles 5 are offset from one another arranged in the printhead, each with any number of cylinders and receptacles can be provided evenly offset on a circular line.

With 14 connections for supply lines (not shown) are designated, which in the embodiment are fixedly arranged in the ring body 1 For understanding the function of the print head can be assumed from the position of FIG. Here, the actuating piston 3 and 7 assume their inner position, so that the ring body I and pressure ring 8 are brought into the approximate position. To an advance of the pipe string, the actuating piston 3 are initially acted upon, the Annular body 1 and the pressure ring 8 are transferred to the position of FIG. Thereafter can hit the actuating piston 7 by moving the pressure ring by Beauf 8 a further Vorhewegen the pipe string 11 can be effected. The pressure ring 8 is possibly up to the position of FIG. 4 moves. To another advance of the pipe string, the ring body and the pressure plate are tracked until this one et. Take the position of FIG. 1 corresponding position.

The actuating pistons are returned to the inner end positions .

By applying appropriate pressure, in particular to the actuating piston 7 there is the possibility to put a torque on the pipe string 11, whereby a rolling of the pipe string 11 can be counteracted.

This is also advantageous for driving the pipe string in toine vorbestlmnlt () Direction or r in the case of alignment to an internally predetermined connection point.

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Claims (7)

Claims print head for pipe jacking in the ground with a Annular body, the cylinder group serving as compression members for the pipe string with actuating piston, that is, that the Ring body (1) carries a first group of pressure elements (2, 3) and a second group Has pressure gileather (6, 7) fixed, the length-variable part of which is on the same axis Pressure ring (8) firmly engages. Print head according to Claim 1, characterized in that the first Group of pressure members (2, 3) with the ends facing away from the Hinqkörper (1) on one common pressure plate (4) are firmly supported. 3. Print head according to claim 1, characterized in that the second Group of pressure members (6, 7) in pot-shaped, firmly interlocked with the ring body (1) Immerse receptacles (5) and into these with the ends facing away from the pressure ring (8) are supported and firmly connected. 4. Print head according to claim 0, characterized in that the first and second group of Druckqlieder by Druckzv-1inder (2, 6) with hydraulically displaceable Print head ben (3, 7) are formed. r> print head according to claim 1, characterized in that the first and the second group of compression members are formed by spindles. 6. Print head according to claim I, characterized in that a group the pressure members (2, 3; 6, 7) by pressure cylinders with pressure pistons and the other Group Druckalieder is formed by spindles. 7. Print head according to claim 1, characterized in that the ring body (1) and / or the pressure ring (8) have connections (14) for supply lines.