EP2177666B1 - Clamp device for ram elements - Google Patents

Abstract

The clamping device has a retainer, at which a hydraulically operated clamp forceps (3) is arranged. The clamp forceps is mounted in a rotary manner, and is hydraulically locked in direction of rotation. The hydraulic locking of the rotary mounted clamping forceps is controlled by a hydraulic sequence circuit. An independent claim is included for a self-aligning device for positioning of clamp forceps at a pilling element.

Description

The invention relates to a clamping device for fastening of ramming elements to a vibrator according to the preamble of patent claim 1.

In special foundation engineering, steel profiles, such as sheet piling profiles, are used for the purposes of excavation, sewer and hydraulic engineering as well as embankment protection. Usually, the introduction of the profiles via vibratory rams. In this case, the transmission of the centrifugal force of the exciter - cell of the vibratory hammer on the pile material by means of a hydraulic clamping pliers, which receives the profile. Here, a clamping force of the clamping pliers is at least equal to 1.2 times the centrifugal force of the exciter cell usual.

To accommodate large Doppelspundwandprofilen so-called double clamps are used. Such double clamping forceps consist of two according to the profiles to be handled on a truss fixed individual tongs. To vote the geometric arrangement of the individual tongs on the profile to be handled they are aligned manually before the piling on the traverse accordingly.

The document US 5568997 shows a clamping device according to the prior art, with the features of the preamble of claim 1.

Concrete profiles are an inexpensive alternative to steel profiles. It is to be expected that the currently used double clamping tongs are unsuitable for the handling of concrete profiles, since they do not withstand the great pressure of the clamping tongs developed for steel profiles and break at the clamping areas. Since dimensional tolerances are inevitable with low-cost concrete profiles, the individual clamping tongs must be precisely aligned with the profiles in order to achieve a uniform surface pressure between the profile and clamping tongs. The orientation of the clamps for each concrete profile, however, designed as expensive and uneconomical.

The invention aims to remedy this situation. The invention is based on the object to provide a clamping device which allows an independent alignment of the individual clamping tongs to the profile to be clamped. According to the invention, this object is solved by the features of the characterizing part of patent claim 1.

With the invention, a clamping device is provided, which allows an independent alignment of the individual clamping tongs to the profile to be clamped. The single clamping pliers is rotatably mounted on the receptacle and can align with the introduction of the profile of this. About a hydraulic, the at least one clamping pliers can be locked in its rotational position.

The hydraulic locking of the at least one rotatably mounted clamping tongs is controlled by a hydraulic sequential circuit, wherein the locking takes place upon reaching a defined clamping pressure of the clamping tongs. As a result, an automatic locking of the clamping forceps is achieved with optimal concerns of the jaws on the ram. Only after applying the jaws to the profile and thereby indicated increase the hydraulic pressure is effected via the hydraulic sequential circuit upon reaching a defined clamping pressure, a locking of the clamping tongs. A manual alignment of the clamps on the respective profile is no longer necessary.

In a further development of the invention, at least one clamping tongs is rotatably mounted. As a result, the independent alignment of at least one clamping tongs is also possible on angled profiles. Preferably, the at least one rotatably mounted clamping pliers can be locked in the direction of rotation via a hydraulic sequential circuit, wherein the locking takes place upon reaching a defined clamping pressure of the clamping pliers. As a result, a complete locking of the clamping jaw is achieved both in the longitudinal and in the direction of rotation upon reaching the defined clamping pressure.

In a further embodiment of the invention, at least one clamping jaw is slidably mounted, wherein the position of the clamping jaw is lockable in the direction of displacement via a hydraulic sequential circuit upon application of a defined clamping pressure of Ktemmzange. As a result, a self-alignment of the clamps to a variety of Profligestaltungen is possible and achieved a complete locking of the clamp in the direction of rotation upon reaching the defined clamping pressure.

In a further embodiment of the invention, at least one clamping forceps is pivotally taped. Preferably, the pivoting movement can be locked by a hydraulic sequential circuit when a defined clamping pressure of the clamping tongs is applied. As a result, the handling of angled profile faces is possible.

In an embodiment of the invention, at least one clamping tongs on a guide for threading a profile. As a result, the introduction of the profile between the jaws of the clamping pliers is facilitated. Preferably, the guide is through formed funnel-like angled to each other employed guide plates. Advantageously, the guide plates are coated with an elastomer.

Advantageously, at least one clamping jaw of a clamping pliers is coated with an elastomer. As a result, the static friction between the jaw and clamping profile is increased, whereby the required clamping force can be minimized. Also, pressure peaks are avoided and the clamping force is gently distributed to the concrete surface.

With the invention, an unclaimed device for self-aligning positioning of clamping tongs on a ram element is provided which allows an independent alignment of the individual clamping tongs to the ramming element to be clamped

In an unclaimed further development of the invention, hydraulic connections for controlling the clamping tongs are arranged, which are connected via a Hydraulikfoleschaltung with the hydraulic locking device for receiving carriage and connection plate, such that when a defined clamping pressure applied to the hydraulic connections locking takes place via the pressure piece. As a result, an automatic locking of the clamping forceps is effected after their alignment with the profile to be clamped and after applying a defined clamping pressure.

In a further unclaimed embodiment of the invention, a device for automatically inserting the piling element is arranged in the clamping device. As a result, the handling of the ram element is facilitated during the clamping process. Advantageous the device comprises a driven cable, via which the ramming element can be inserted into the clamping device.

Figur 1

die Darstellung einer Klemmvorrichtung zur Befestigung eines Pro- fils an einem Vibrator;

Figur 2

die Traverse mit Aufnahmewagen der Klemmvorrichtung aus Fi- gur 1 in dreidimensionaler Darstellung;

Figur 3

die Traverse aus Figur 2 in der Ansicht von vorne;

Figur 4

die Traverse aus Figur 2 in der Draufsicht;

Figur 5

die Darstellung der Traverse mit Aufnahmewagen aus Figur 2 in der Seitenansicht von rechts;

Figur 6

die Darstellung der Traverse mit Aufnahmewagen aus Figur 2 im Schnitt A-A;

Figur 7

die Darstellung der Traverse mit Aufnahmewagen aus Figur 2 im Schnitt B-B mit in Schnittebene gedrehtem Hydraulikanschluss.

Other developments and refinements of the invention are specified in the remaining subclaims. An embodiment of the invention is illustrated in the drawings and will be described in detail below. Show it:

FIG. 1

the representation of a clamping device for fixing a profile on a vibrator;

FIG. 2

the Traverse with receiving carriage of the clamping device of Figure 1 in three-dimensional representation;

FIG. 3

the crossbar out FIG. 2 in the view from the front;

FIG. 4

the crossbar out FIG. 2 in the plan view;

FIG. 5

the representation of the traverse with recording car from FIG. 2 in the side view from the right;

FIG. 6

the representation of the traverse with recording car from FIG. 2 on average AA;

FIG. 7

the representation of the traverse with recording car from FIG. 2 in section BB with hydraulic connection turned in cutting plane.

The clamping device selected as an exemplary embodiment is essentially formed by a traverse 1, on which two receiving carriages 2 are arranged so as to be displaceable, each receiving a clamping tong 3.

The cross member 1 is formed by a carrier 11 which is provided with guide rails 12. The guide rails 12 are used to hold receiving carriage 2. On both sides of the support 11, a stop plate 13 by means. Bolts 131 attached. On its upper side opposite the guide rails, a flange 14 for fixing the crossbar to a vibrator 5 is arranged on the carrier 11 by means of screws 15.

The receiving carriage 2 essentially comprises a guide clip 21, which receives a rotary piece 22 to which a connecting plate 23 is fastened by means of screws 231. The guide clip 21 has a substantially U-shaped cross section, on the legs of which inwardly directed support webs 210 are formed. The support webs 210 are formed such that on their inside an undercut is formed, in which the guide rails 12 of the carrier 11 engage.

The rotary member 22 is largely formed as a hollow cylinder, which is circumferentially provided with a collar 221. The rotating piece 22 passes through the recess 212 of the guide clip 21 and rests with the collar 221 on the inside in the guide clip 21.

In the rotary piece 22, a piston piece 24 is arranged. The piston piece 24 is formed substantially hollow cylindrical. At its the turning piece 22 zungewandten underside, the piston piece 24 is provided with an annular recess 240. Around the piston piece 24 is sealed by seals 241 relative to the rotary member 22. Within the piston piece 24, a pressure piece 26 is arranged via an axial spherical plain 25. The pressure piece 26 is rotationally symmetrical with a T-shaped cross section and protrudes with its diameter-tapered portion in the central bore of the joint sliding bearing 25, so that the diameter-distributed portion of the pressure piece 26 rests on the inner ring 251.

The rotary member 22 is centrally provided with a bore 222 which is aligned with a central blind bore 232 of the connection plate 23, in which a hydraulic line 28 opens. The hydraulic line 28 is provided laterally of the connection plate 23 with a hydraulic connection 281. The bore 222 of the rotary member 22 terminates in the annular recess 240 of the piston piece 24. If pressure is applied to the hydraulic line 28 via the hydraulic connection 281, the piston piece 24 is pressed in the direction of the pressure piece 26, whereby it is pressed against the traverse 1 and the Pickup carriage 2 locked relative to the Traverse 1. Similarly, the inner ring 251 against the pressure piece 26 pressed, whereby the radial mobility of the rotating piece 22 is inhibited.

The clamping pliers 3 is screwed via the connecting plate 23 with the rotary piece 22. The clamping jaw 3 is essentially formed by a base body 31, in which opposite two jaws 32 are arranged, which are displaceable against each other via a hydraulic cylinder 33. At its side opposite the receiving carriage 2 side 31 guide plates 34 are screwed to the base body, which form a funnel, which serve as Einfädelhilfe for the male and to be clamped profile 4.

When picking up a profile 4, the jaws 32 are moved far apart, so that the clamping jaw 3 can be positioned over the male profile using the guide plates 34. When the hydraulic cylinders 33, to which the movable clamping jaws 32 are fastened, are subjected to oil, the movable clamping jaws 32 and the clamping jaws 32 firmly mounted on the clamping jaw housings bear on the profile 4. In this case, the individual clamping tongs 3 are moved and rotated so that both clamping tongs 3 clamp the profile 4, but without introducing any significant bending stresses in the profile 4. As soon as the pressure in the clamping cylinders 33 exceeds a limit value, the pressure piece 26 is pressurized via the hydraulic line 28 via a pressure follower valve (not shown) which opens at the set limit value, whereby the housing of the clamping tongs 3 is clamped against the crossbeam 1 and thus secured against twisting and shifting.

In addition to concrete profiles, the clamping device according to the invention with freely displaceable and rotatably mounted clamping tongs 3 is also suitable for Z-profiles and pipes. Different Z-profiles different distances and angles of rotation of the individual clamping forceps 3 are required.

In an advantageous not claimed embodiment, a device is arranged, by means of which the profile 4 between the jaws of the clamping jaw 3 can be inserted.

This device may for example be driven by means of motors, swivel motors or cylinders which move the ram on ropes, chains or other suitable elements between the jaws.

Claims (8)

1. Clamp device for fastening ram elements to a vibrator, which clamp device comprises a mounting means on which is or are disposed one or more hydraulically operable clamping means, where one or more of the clamping means is or are mounted rotatably, where one or more clamping means (3) can be hydraulically locked in the direction of rotation, characterised in that the hydraulic locking means of the one or more rotatably mounted clamping means (3) is controlled via a hydraulic sequencing circuit, where locking occurs when a specified clamping pressure is reached on the clamping means (3).
2. Clamp device in accordance with claim 1, characterised in that one or more clamping means (3) is or are mounted displaceably, where the position of the clamping means (3) can be locked in the direction of displacement by means of a hydraulic sequencing circuit when a specified clamping pressure is reached on the clamping means (3).
3. Clamp device in accordance with any one of the aforementioned claims, characterised in that one or more clamping means (3) is or are pivotably mounted and can be locked in the direction of pivot.
4. Clamp device in accordance with claim 3, characterised in that the pivoting position of the clamping means (3) can be locked by means of a hydraulic sequencing circuit when a specified clamping pressure is reached on the clamping means (3).
5. Clamp device in accordance with any one of the aforementioned claims, characterised in that one or more clamping means (3) incorporates a guide for the insertion of a profile.
6. Clamp device in accordance with claim 5, characterised in that the guide is formed by guide plates (34) arranged at an angle to each other in the form of a conical funnel.
7. Clamp device in accordance with claim 6, characterised in that the guide plates (34) are coated with an elastomer.
8. Clamp device in accordance with any one of the aforementioned claims, characterised in that one or more clamping jaws (32) of a clamping means (3) is or are coated with an elastomer.

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