EP0014715B1 - Machine for pulling out a drilling tube of the ground - Google Patents

Abstract

A machine for pulling out a drilling tube for a foundation pile, after concreting, is composed of a tightening collar consisting of several parts (2a to 2f), with a tightening cylinder (9) and a forked base frame. Those of the tightening parts (2c, 2d) which close the opening of the fork of the base frame, can be spaced apart by means of a closing twin-cylinder (16, 17) so that the fork is entirely free and the machine can be set laterally on a working position with respect to the tube. To close the tightening collar, the spaceable tightening parts (2c, 2d) are brought back into position and firmly locked together by means of a locking bolt (24).

Description

The invention relates to a pipe drawing machine for pulling a drill pipe for pile foundations after concreting, with a multi-section clamp, the links of which are connected to one another, and with hydraulic cylinders for moving the clamp members for the purpose of applying a closing force, and with a base frame which allows the drill pipe to pass through at the side Pushing the pipe drawing machine into the working position is provided with an opening, the clamping clamp members adjoining one another in the circumferential direction being able to be spread apart for lateral passage of the drill pipe in the region of the opening of the base frame and being lockable with one another in the working position of the pipe drawing machine. The invention is therefore based on a pipe clamp for a hydraulic piping device, as described in DE-A-2 708 727, which, with regard to Art. 87 of the EPC, does not constitute the state of the art under Art. 54 (2) of the EPC belongs. This pipe clamp also has tension clamp members that open to the front in order to be able to move the entire device laterally relative to a drill pipe into the working position or vice versa. However, since it is a pipe clamp for a hydraulic piping device, in which the pipe clamp is set in oscillating rotary movements in order to drive down a drill pipe, a closed support frame for supporting the rotatable pipe clamp is necessary, which is used to push the entire device sideways when the pipe clamp is open at the front must also be opened, which is made possible by a releasable cross bracing of the frame. This cross strut must be connected to the longitudinal struts of the support frame when the entire device has been moved to the working position on the ground. This requires a certain amount of space to attach the cross strut, which is why it is impossible to treat, for example, pull a drill pipe placed near a wall. This is also not possible because the horizontally pivotable, circumferentially adjacent clamping clamp members have to pivot outward on circular arcs in order to form an opening for the passage of the drill pipe. The spread position of these clamp members determines the minimum distance from a wall on which the device can be pushed sideways to the drill pipe.

The invention has for its object a pure pipe drawing machine without piping, d. H. to set up according to DE utility model 77 18 042 to pull a drill pipe driven in close proximity to the wall. It uses the feature described in DE-A 27 08 727 of a base frame provided with an opening for the passage of the drill pipe, the solution to the problem being that the clamping clamp members adjoining in the circumferential direction and forming the opening are articulated to adjacent intermediate Tension clamp members are connected, which can be expanded by means of a double-acting locking cylinder, taking the tension clamp members forming the opening, so far that these tension clamp members - pivoted inward like a toggle lever - form the opening for the passage of the drill pipe. The adjoining tension clamp members thus need to spread, i.e. H. to produce the passage opening, no space restricting the lateral displaceability of the tube drawing machine with respect to a wall, but rather its articulation points are pivoted outwards, the tensioning clamp members themselves being able to be pivoted inward like a toggle lever.

The intermediate tensioning clamp members, as well as two adjoining main tensioning clamp members, are expediently mirrored on fixed axles supported by the base frame. This also ensures that the two expandable tension clamp members themselves no longer perform a swiveling movement to the outside, but are adjusted to a required distance from one another by the swiveling movement of the intermediate members, similar to the luffing jib of a crane. The circular arc, on which the ends of the intermediate members move, does not touch the wall, since the intermediate members in the one end position, in which the expandable clamp members adjoin one another, run only slightly relative to the respective perpendicular to the wall. The vertical swiveling axes of the intermediate links are expediently the diametrically arranged lifting cylinders of the pipe drawing machine, which are supported on the base frame and effect the step-by-step drawing strokes for drawing the drill pipe.

The lock cylinders for moving the intermediate links and thus for spreading the expandable tension clamp members are expediently fixed in an oscillating manner between pairs of plates which carry the main tension clamp links. These main tensioning clamp members preferably extend over an arc angle of somewhat less than 180 ° and, as is known, can be actuated by a single floating tensioning cylinder. When these main clamps are pivoted inwards to fix the pipe drawing machine on the drill pipe to be drawn, the locked expandable clamp members form a counter support surface.

The tensile lock between the two expandable tendons can be designed as desired and can also be operated by hand. Examples of such interlocks are shown in US-A-1 804 758, 684 166 and 3 675 278. Not A locking device according to FR-A-1 532569 would be usable, since its function runs counter to the task set out in the context of this invention of being able to set up a pipe drawing machine near the wall.

Preference is given to locking the expandable tensioning clamp members on a locking bolt pivotally mounted on a tensioning clamp member about a vertical axis and, as known per se, provided with a thickened head locking bolt, the other clamping clamp member being provided with a two-part abutment for the thickened head of the locking bolt. An abutment half is designed as an arm that can be swung outwards and is attacked by a double-acting small actuating cylinder. As a result, the locking process can be carried out automatically, as will be explained in more detail in the drawing description.

• Fig. 1 eine Seitenansicht,
• Fig. 2 eine Draufsicht, und
• Fig. 3 eine Draufsicht wie Fig. 2 mit Offen-Stellung der Spannschellenanordnung.

In the drawing, an embodiment of a pipe drawing machine according to the invention is shown, and that shows

• 1 is a side view,
• Fig. 2 is a plan view, and
• Fig. 3 is a plan view like FIG. 2 with the clamp assembly in the open position.

The main components of the tube drawing machine are a base frame 1, a clamp arrangement 2 (FIG. 1) and two diametrically arranged lifting cylinders 4 and 5, the piston rods 4a and 5a of which are supported on the base frame 1. The tensioning clamp arrangement 2 is axially fixed to the lifting cylinders 4, 5, but certain tensioning clamp members are arranged such that they can be pivoted about the lifting cylinders as vertical axes. When the clamp assembly 2 is clamped with a drill pipe to be drawn and the piston rods 4a, 5a of the lifting cylinder are extended, a drawing stroke is carried out.

From Fig. 2 it can be seen that the pipe drawing machine has moved very close to a wall 6 in order to pull a drill pipe located near the wall. These space conditions do not allow the use of a conventional pipe drawing machine, which is normally threaded onto a drill pipe to be pulled and thus brought into the working position. The first step in being able to bring the pipe-drawing machine into the working position by a movement directed towards the wall 6 is that the base frame 1 is designed to be fork-shaped open towards the wall 6, which is not the case in the plan view according to FIG. 2 for reasons of clarity is shown in more detail. 1 shows the closed side of the base frame 1, which contains the entire hydraulic supply system.

According to FIG. 2, the tensioning clamp arrangement 2 initially comprises two main tensioning clamp members 2a and 2b, which extend over an almost 180 ° arc angle and are arranged on two approximately fork-shaped plate pairs 7 and 8. The fork shape of the plate pairs 7 and 8 corresponds approximately to the fork shape of the base frame 1. The plate pairs and 8 are pivotally mounted on the diametrically arranged lifting cylinders 4, 5 and are actuated by a single double-acting floating cylinder 9. The clamping cylinder 9 is connected in an articulated manner to the plate pair 7 at 11 pairs of tabs 10 and in an articulated manner to the pair of plates 8 at 12 via the piston rod 9a (FIG. 1). A clamping stroke is carried out by moving the piston rod 9a to the left and the tabs 10 to the right.

The multi-element tension clamp arrangement 2 further comprises two adjoining tension clamp elements 2c and 2d and two intermediate elements 2e and 2f in the region of the open fork of the base frame 1. The adjoining tension clamp members 2c and 2d can be expanded in order to open the link chain of the tension clamp assembly 2 to the wall 6 approximately as far as the fork-shaped opening of the base frame 1. For this purpose, the tension clamp member 2c is connected to the intermediate link 2e via a hinge pin 14 and the tension clamp member 2d via one Hinge pin 15 hinged to the intermediate member 2f. The intermediate links 2e and 2f, in turn, are also pivotally mounted on the lifting cylinders 4, 5 and connected to locking cylinders 16 and 17, which are fixed at 18 and 19 in a horizontal plane between the plate pairs 7 and 8 in an oscillating manner. The outlines of the intermediate members 2e and 2f of the clamp arrangement are highlighted in FIG. 2 by hatching.

As already mentioned, the adjoining tension clamp members 2c and 2d are connected in an articulated manner to the intermediate members 2e and 2f, however their relative pivotability about the articulated pins 14 and 15 is limited by arcuate slots 20, 21 in the intermediate members, into the pins 22, 23 of the Engage tension clamp members 2c, 2d. To illustrate this limited pivoting mobility of the clamp members 2c, 2d, the upper plate 8 has been partially broken away on the right side in FIG. 2.

FIG. 2 shows the two adjoining tension clamp members 2c, 2d in the closed position, in which the piston rods of the closing members 16, 17 are extended. In this closed position, the two tension clamp members 2c, 2d are locked by a locking bolt 24 which is pivotally mounted on the tension clamp member 2c about a vertical hinge pin and has a thickened head 24a which, in the locking position, engages behind a two-part abutment 26, 27 of the tension clamp member 2d . The fixed abutment part 26 is a projection which is uniform with the tensioning clamp member 2d, whereas the abutment 27 is part of an arm 28 of the tensioning clamp member 2d which can be swung outward. This arm 28 is pivotally mounted about a hinge pin 29 of the clamp member 2d. To move the arm 28 with the abutment 27 between the in Fig. 2nd The latch position shown and a swung-out position serve a small double-acting actuating cylinder 30 which is fixed to the clamping clamp member 2d. The arm 28 has a projecting corner 28a which, when the arm 28 is pivoted, presses against the head 24a of the latch bolt 24 and pivots it counterclockwise so that the thickened head 24a is released from the fixed abutment 26.

• Ausgehend von der in Fig. 2 dargestellten Schließlage sei angenommen, daß die Rohrziehmaschine ein Rohr gezogen hat und vorbereitet werden soll, um an einem anderen Bohrrohr eingesetzt zu werden. Hierzu müssen die aneinandergrenzenden Spannschellenglieder 2c, 2d aufgespreizt werden, wie Fig. 3 zeigt. Zunächst wird durch Betätigen des Stellzylinders 30 der Arm 28 mit dem Widerlager 27 auswärts geschwenkt, wobei die Nase 28a den verdickten Kopf 24a des Riegelbolzens 24 von dem Widerlager wegdrückt. Hiernach werden die Schließzylinder 16, 17 auf Einziehen ihrer Kolbenstange betätigt, wodurch die Zwischenglieder 2e, 2f gegenläufig um ca. 90° nach außen schwenken und die Spannschellenglieder 2c, 2d so weit sich voneinander entfernen, daß sie mindestens den Abstand eines Bohrrohrdurchmessers haben. Bei diesem Auseinanderschwenken der Zwischenglieder 2e, 2f können die Spannschellenglieder 2c, 2d an der Wand 6 vorbeigleiten und um die Gelenkzapfen 14, 15 schwenken, jedoch nur so weit, wie die Länge der bogenförmigen Schlitze 20, 21 es erlauben. Das Einwärtsschwenken der Spannschellenglieder 2c, 2d bis zur Grenzlage, in der sich die Zapfen 22, 23 an den anderen Enden der Schlitze 20, 21 befinden, wie Fig. 3 zeigt, kann auch von Hand erfolgen.

The operation of the pipe drawing machine according to the invention is as follows:

• Starting from the closed position shown in Fig. 2, it is assumed that the pipe drawing machine has drawn a pipe and is to be prepared to be used on another drill pipe. For this purpose, the adjoining clamp members 2c, 2d must be spread out, as shown in FIG. 3. First, by actuating the actuating cylinder 30, the arm 28 with the abutment 27 is pivoted outward, the nose 28a pushing the thickened head 24a of the locking bolt 24 away from the abutment. Thereafter, the locking cylinders 16, 17 are actuated to retract their piston rod, as a result of which the intermediate links 2e, 2f pivot in the opposite direction by approximately 90 ° and the tensioning clip links 2c, 2d move so far apart that they are at least the distance apart from one drill pipe diameter. During this pivoting apart of the intermediate links 2e, 2f, the tensioning clamp links 2c, 2d can slide past the wall 6 and pivot about the pivot pins 14, 15, but only as far as the length of the arcuate slots 20, 21 allow. The inward pivoting of the clamp members 2c, 2d to the limit position in which the pins 22, 23 are located at the other ends of the slots 20, 21, as shown in FIG. 3, can also be done by hand.

If the main tensioning clamp members 2a, 2b are opened by retracting the piston rod 9a of the tensioning cylinder 9, the pipe drawing machine is prepared in order to be implemented for drawing a drill pipe (FIG. 3).

The pipe drawing machine is brought into the working position by being pushed towards the wall 6 with the clamp clamp members 2c, 2d spread apart, so that the drill pipe enters the fork-shaped opening of the base frame 1 and the opened clamp clamp assembly 2. The piston rods of the locking cylinders 16, 17 are then extended and the intermediate links 2e, 2f are pivoted inward in opposite directions. In this case, the tension clamp members 2c, 2d find a stop on the drill pipe and thus maintain their approximately aligned position with one another. This aligned position is important for an automatic threading of the locking bolt 24 into the abutment of the clamp member 2d, whereby it is ensured that the clamp member 2d reaches the limit pivot position determined by the end position of the pin 23 relative to the intermediate member 2f earlier than the other clamp member 2c. For this purpose, the locking cylinder 16 is actuated throttled when its piston rod is extended. If the thickened head 24 reaches with its lower oblique run-up surface in the area of the abutments 26 and 27, it slides against the pressure of a spring 31 over the abutment 26 and falls behind this abutment. The arm 28 can be pivoted during this process, so that when the thickened head engages behind the abutment 27, the arm 28 dodges against the sustained pressure in the actuating cylinder 30. The tension clamp members 2c and 2d are thus locked together in a tensile manner.

After the link chain of the tensioning clamp arrangement 2 is closed in this way, the piston rod 9a of the tensioning cylinder 9 is extended, as a result of which the main tensioning clamp links 2a, 2b with their plate pairs 7, 8 swivel inwards in opposite directions about the lifting cylinders 4, 5 and against the drill pipe to be pulled press the tension clamp members 2e, 2c, 2d, 2f, which are locked against one another in a tensile manner. So that the clamp assembly 2 is clamped to the drill pipe so that the lifting cylinders 4, 5 can be actuated to carry out a drawing stroke.

At this point it should be noted that an embodiment of the pipe drawing machine is conceivable in which the clamp members 2c, 2d could be pivoted around the pivot pins 14, 15 by means of special hydraulic cylinders and thereby spread apart.

Then - in order to bring the pipe-drawing machine near the wall 6 into the working position - the displacement movement of the pipe-drawing machine towards the wall 6 must be accompanied by a controlled pivoting-in of the tensioning clamp members 2c, 2d in order to bring these members to the lateral surface of the drill pipe facing the wall 6 Bring attachment.

Claims (5)

1. Tube pulling machine for the pulling of a drill tube for pile foundations after cementing, comprising a multiple element clamping collar (2a, b, c, d, e, f) with interconnected elements, and hydraulic cylinders (9) for the operation of the clamping collar elements in order to apply a closure force, and comprising a support frame (1) provided with an opening for the passage of the drill tube when the tube pulling machine is moved laterally toward the drill tube into operating position, and wherein the circumferentially adjacent clamping collar elements (2c, d, e, f) are adapted to be spread apart in the area of the support frame opening to permit lateral passage of the drill tube, and are adapted to be locked together in the working position of the tube pulling machine, characterized in that the circumferentially adjacent clamping collar elements (2c, 2d) defining the opening are each pivotably connected to adjacent intermediate clamping collar elements (2e, 2f) which are each adapted to be spread apart by means of a double action closure cylinder (16, 17) and take along therewith the clamping collar elements (2c, 2d) defining the opening a distance sufficient for these clamping collar elements - pivoted inwardly similarly to a bell crank - to form the opening for the passage of the drill tube so as to permit the tube pulling machine to be placed into working position in proximity of a wall.

2. Tube pulling machine according to claim 1, characterized in that the intermediate clamping collar elements (2e, 2f) as well as two adjacent principal clamping collar elements (2a, 2b) are symmetrically mounted on stationary axes (4, 5) supported from the support frame (1 ).

3. Tube pulling machine according to claim 2, characterized in that the closure cylinders (16, 17) are pendulum like secured between plate pairs (7, 8) supporting the principal clamping collar elements (2a, 2b).

4. Tube pulling machine according to claims 1 to 3, characterized in that the principal clamping collar elements (2a, 2b) extend over an arc angle of somewhat less than 180° and are actuatable, as is known per se, from a single floatingly arranged clamping cylinder (9).

5. Tube pulling machine according to claim 1, characterized in that for the purpose of locking the clamping collar elements (2c, 2d) defining the opening, on one clamping collar element (2c) is pivotably mounted, as is known per se, on a vertical hinge pin (25), a locking pin (24) having an enlarged head (24a) and the other clamping collar element (2d) is provided with a two-part abutment (26, 27) for the enlarged head of the locking pin, and that one portion (27) of the abutment is formed by an outwardly pivotable arm (28) of the said clamping collar element (2d) to which arm a double action actuating cylinder (30) is connected.

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