DE102019108100B3 - Pile foundation drilling rig - Google Patents

Abstract

The invention relates to a pile foundation drilling device with a boom (12) with a rotary drive (13) which is arranged to be vertically displaceable on a leader (11) in the drilling direction (Z), a drill pipe connection (14) below the rotary drive (13) and a storage hopper (15) above the rotary drive (13) for a concrete suspension to be introduced, characterized in that a universal joint (2) is arranged between the rotary drive (13) and the drill pipe connection (14), which is attached to the rotary drive (13) with an upper connecting piece (21) and with a the lower connection piece (23) forms the drill pipe connection (14), an elastic sleeve (24) being provided in the universal joint (2), which connects the upper connection piece to the lower connection piece (21, 23) in a sealing manner.

Description

The invention relates to a pile foundation drilling device with a boom with a rotary drive arranged vertically displaceably on a leader, a drill pipe connection below the rotary drive and a storage funnel above the rotary drive for a concrete suspension to be introduced.

For the setting of foundation piles, the so-called full displacement pile is known, in which a drill pipe is used to drive a drill pipe with a drilling and displacement tip into the ground, displacing and compacting the ground, then inserting a reinforcement cage into the resulting cavity and filling this cavity with flowable concrete becomes. The drill pipe is pulled and rotated, thereby concreting the pile shaft. The displacement tip remains below the concrete pile as a lost toe in the ground. Such a device for producing a cast-in-place concrete and its manufacturing process are in the EP 1 726 719 A1 described. Likewise, in the EP 1 134 319 B1 describes such an in-situ concrete pile manufacturing process.

Furthermore, in the US 9,611,611 B2 a feed arrangement for borehole backfill material (potting material, such as concrete suspension) is known, in which the drill pipe can be connected to a feed pipe in a sealing manner, so that the backfill material (concrete suspension) can be acted upon in the interior of the drill pipe even under overpressure.

This pile foundation process has proven itself over many years. However, significant torques occur at the drill at the transition from the rotary drive to the drill pipe to be inserted into the ground, which result in bending moments that result when the drill is not precisely aligned for drill hole orientation and especially when the drill pipe migrates due to obstacles or lateral anomalies in the ground Failure of the connection from the rotary drive on the leader (drilling mast) to the drill pipe.

In order to avoid these bending moments which destroy the material, drilling devices with a hydraulic rotary drive with an integrated universal joint are known. For example, from the DE 10 2008 022 478 B3 a drill for screwing foundation equipment as an attachment to the extension arm of a construction vehicle is known, in which the drill is arranged below a universal joint. A similar device is on a drilling device for the introduction of tubular piles into the ground, again as an attachment for a construction machine, with a universal joint provided above the drilling device attached to the boom US 2005/0201836 A1 known.

Furthermore, in the DE 39 13 313 A1 describes a construction machine with a drilling device and a height-adjustable vibrating bar arranged on a leader, in which a universal joint below the drill drive and below the universal joint, a filler neck equipped with a rotating union are provided for a concrete suspension.

Furthermore, it is from the DE 10 2012 112 411 B3 known to use an actively controlled universal joint as a press drill steering device.

The DE 10 2017 115 848 A1 describes an arrangement of two universal joints on a drilling device, in which the propulsion takes place along a drilling rig, which can shift relative to the subsurface in which the drilling is to be advanced, which is particularly applicable for a drilling rig on floating platforms, such as drilling ships . A stabilizing or locking device for damping or blocking the pivotability of the universal joints as required by corresponding hydraulic cylinders is described.

It is noted that already existing older drilling rigs cannot be retrofitted with a universal joint to the drive technology, or only at great expense, and the drilling drive with an integrated joint is also very large and expensive. Furthermore, the filling of the drill pipe with the flowable concrete is made more difficult since, due to the construction, no larger concrete supply can be provided.

The object of the invention is therefore to provide a relatively small articulated connection between a conventional drill rotary drive on the leader and the pile foundation pipe on a pile foundation drilling device, wherein a supply of concrete suspension is possible through this articulated connection.

This object is achieved with a pile foundation drilling device according to claim 1. Because a cardan joint is arranged between the rotary drive and the drill pipe connection, which is fastened to the rotary drive with an upper connecting piece and forms the drill pipe connection with a lower connecting piece, an elastic sleeve being provided in the cardan joint is an sealing connection between the upper drive and the lower connecting piece, an articulated connection between the drill drive and the drill pipe is achieved, whereby an angular offset to that specified by the leader Direction of drilling by a few degrees is possible if, for example, the drill pipe is displaced when being introduced into the ground due to obstacles, ground anomalies, etc. The articulated connection between the drill pipe and the drill drive means that the couplings required there are less stressed and have a much longer service life.

This prevents construction site repairs of the couplings and the falling of the screw connections (breakage due to large bending moments). Furthermore, the lifespan of the leader as well as that of the drill motor or drill drive increases due to the no longer occurring bending moments. If an obstacle, such as an erratic boulder, is touched when drilling in the drill pipe with the displacement and drill tip attached to the foot, the drill pipe can move a few degrees without having to realign the leader of the drill to the slightly changed drilling direction. This property allows a continuous drilling progress, even with a slight deviation of the target orientation of the drilling, for example up to 5 °. Nevertheless, after inserting the reinforcement cage into the cavity created by the full displacement by means of a drill tip and drill pipe, the amount of flowable concrete required for concreting can then be poured into the remaining cavity from the top and stored in the funnel arranged above the rotary drill drive. When subsequently pulling the drill pipe and sinking the flowable concrete into the additional ring volume that is now freed up, laborious refilling of concrete or continuous pumping in of concrete is not necessary.

In order to hold the flowable concrete in the usual way over the funnel arranged above the rotary drill drive and to let it slide when the drill pipe is pulled, the elastic sleeve is provided inside the joint, which provides a sealed fluid connection between the passage of the hydraulic rotary drill drive and the one attached to the universal joint below Ensures drill pipe.

Because the universal joint is an add-on part that can be inserted between the rotary drive and the drill pipe connection, conventional hydraulic rotary drill drives can also be retrofitted with this joint if necessary, without the entire drill head having to be replaced and the leader possibly having to be converted. Retrofitting is possible at any time due to the installation of the universal joint directly below the drill drive, if necessary also at the drilling site on the construction site. The boom with the rotary drive is lowered on the leader without a drill pipe attached and the universal joint to be mounted is provided on the floor below the boom. The universal joint is then coupled to the rotary drive by means of bolts provided for this purpose, so that a pile foundation drilling device is then equipped with a universal joint. Below the universal joint, the drill pipe can then be attached to the lower connecting piece in the usual way, as is otherwise done directly on the rotary drive. Due to the compact design of the universal joint, only 30 to 40 cm drilling stroke on the leader is consumed by the attachment. This is not critical for most applications.

In a further embodiment, the elastic sleeve has an inside diameter that is greater than or equal to the free inside diameter of the connecting piece. This means that the concrete suspension fed in from above via the funnel can easily slip through the sleeve of the attached universal joint, just like other material to be used, such as iron struts etc.

The inside diameter of the connecting piece is preferably so large that a pile reinforcement cage can be pushed through. Thus, the reinforcement cage required for the formation of the resilient in-situ concrete pile can be inserted into the empty cavity of the drill pipe immediately after the drill pipe with a displacement and drill tip has been drilled through the not yet filled hopper, the rotary drive and the universal joint, without the drill drive from Drill pipe must be removed. Immediately afterwards, the prepared concrete suspension can be poured into the drill pipe with the pile reinforcement cage inside via the funnel. The funnel is made so large that when the drill pipe is subsequently pulled and the flowable concrete sags into the additional ring volume that is now released, it is not necessary to refill concrete or to continuously pump concrete. This considerably reduces the amount of equipment and work required on the construction site.

If the elastic sleeve is made of rubber, the sleeve is sufficiently elastic and, at the same time, is sufficiently durable for rough construction site use to withstand the mechanical (slight angle adjustments, insertion of the reinforcement cage, etc.) and chemical (wetting with concrete suspension) loads.

The elastic sleeve preferably allows the universal joint to be adjusted by a deflection angle with α 5 5 ° in all directions with respect to the drilling direction specified by the leader. Such a deflection of the drill pipe is still without impairing the drilling progress and also without There is a risk of contact with the leader or other parts of the drill.

The fact that the universal joint has a central part which is essentially annular in the radial plane to the drilling direction and which is pivotably articulated on the upper connecting piece via a first radial axis and on the lower connecting piece via a second radial axis which is oriented at 90 ° to the first radial axis Cardan joint in its vertical extension can be designed to be small in order to lose as little as possible of the possible drilling stroke of the pile foundation drilling device on the leader through the cardan joint mounted on the drill drive. The construction height can, for example, be reduced to less than 30 cm.

If the elastic sleeve is carried out within the annular middle part between the upper connection piece and the lower connection piece, a configuration of the elastic sleeve within the cardan joint that does not restrict the cross section is possible. The ring-shaped central part can be designed with a square cross-sectional opening on the inside and, for example, octagonal on the outside.

Due to the fact that the universal joint between the upper connecting piece and the middle part on the one hand and between the middle part and the lower connecting piece on the other hand has counterforce elements which generate a restoring force that increases sharply with the amount of deflection, the increasing restoring force can suddenly reach the maximum deflection of the cardan joint and a sudden overload occurring in the process can be avoided. The restoring force is generated, for example, by springs or hydraulic cylinders.

An exemplary embodiment of the invention is described in detail below with reference to the accompanying drawings.

• 1 ein Pfahlgründungsbohrgerät mit Kardangelenk in einer Seitenansicht,
• 2 eine Seitenansicht des Kardangelenks und
• 3 einen Schnitt durch das in 2 dargestellte Kardangelenk.

It shows:

• 1 a pile foundation drill with universal joint in a side view,
• 2nd a side view of the universal joint and
• 3rd a cut through the in 2nd illustrated universal joint.

In 1 An embodiment of a pile foundation drilling device according to the invention is shown in a side view. The pile foundation drill 1 has one with a chain drive on the ground G movable machine car 10th on which a leader 11 or drilling mast is attached. On the leader 11 is an outrigger 12th height-adjustable. The boom 12th carries a hydraulically driven rotary drive 13 . Above the rotary drive 13 is a supply funnel 15 arranged for filling a concrete suspension. Below the rotary drive 13 is a universal joint 2nd detachably attached. Below the universal joint 2nd is a drill pipe 16 arranged, the lower end with a displacement and drilling tip 17th is sealed watertight.

In 2nd is the universal joint 2nd reproduced in detail in a side view. Furthermore, in 3rd a cut along the in 2nd shown line AA reproduced.

The universal joint 2nd has an upper connector 21 on that to the rotary drive 13 of the boom 12th can be connected. Furthermore, a middle part 22 provided about a first radial axis 25th swiveling with the upper connection piece 21 over at the upper connection piece 21 attached brackets is connected. Below the middle section 22 is a lower connection piece 23 arranged of the drill pipe connection 14 for connecting the drill pipe 16 forms. The lower connection piece 23 is again about a second radial axis 26 leading to the first radial axis 25th is rotated by 90 °, pivotally connected. Brackets extend from the lower connection piece 23 about the second radial axis formed from bolts 26 around.

From the top connector 21 protrudes an upper cuff 27 towards the middle section 22 protrudes as well from the lower connecting piece 23 a lower sleeve connector 28 towards the middle section 22 forth. On these two sleeve ends 27 , 28 is an elastic cuff 24th sealed so that the free space of the upper connection piece 21 with the free space of the lower connection piece 23 is sealingly connected to substantially the same inner diameter. The elastic cuff 24th is made of rubber and can therefore move between the upper connection piece 21 and the lower connecting piece 23 due to the cardanic suspension in an adjustment range up to at least 5 ° from that of the leader 11 given drilling direction Z. allow.

The universal joint 2nd thus allows torque transmission from the boom 12th arranged rotary drive 13 on the drill pipe 16 , when lowering the drill pipe 16 with that at the lower opening of the drill pipe 16 arranged displacement and drilling tip 17th possible evasion due to drilling obstacles (field stones) or soil anomalies caused by the universal joint 2nd can be added without having to realign the pile foundation drilling machine 1 by moving the machine cart 10th is required. Adjustment amounts up to a deflection angle α ≤ 5 ° can be easily accepted.

Due to the relatively large free inner diameter of the on the boom 12th arranged hopper 15 through the rotary drive 13 and the universal joint 2nd into the drill pipe 16 , a pile reinforcement cage required to create the in-situ concrete pile after the drill pipe has been inserted 16 with the attached displacement and drilling tip 17th easily from above through the storage hopper 15 , the rotary drive 13 , the universal joint 2nd into the drill pipe 16 be let in. For this is at the top of the drilling mast (leader) 11 a corresponding winch is provided (in 1 not shown). Then the seal between the drill pipe 16 and displacement and drilling tip 17th still dry interior with a suitable concrete suspension over the funnel 15 filled. If the entire drill pipe 16 including the supply funnel 15 is filled with concrete by turning back the drill pipe 16 by means of reversed rotary drive 13 the displacement and drilling tip 17th at the bottom in the ground G unlocked and as a so-called "lost tip" when pulling out the drill pipe 16 in the ground G leave.

When lifting the drill pipe 16 by raising the boom 12th on the leader 11 becomes the annulus of the drill pipe 16 released in the subsoil so that the filled concrete suspension from the storage funnel 15 slips into the borehole. Any voids in the ground G behind the drill pipe 16 are also filled in by the concrete suspension pressing down from above. With appropriate dimensioning of the supply funnel 15 subsequent refilling of concrete is not necessary. The in-situ concrete foundation pile can thus be created in one work step.

By inserting the cardan joint 2nd between rotary drive 13 and drill pipe 16 can when migrating the drill pipe 16 As the drilling progresses, no more bending moments on the drill pipe attachment at the drill pipe connection 14 occur that can lead to high wear and, in the worst case, failure of the coupling. If the drilling pipe migrates in the case of a foundation drilling 16 not feared and should be the full lifting height of the leader 11 of the pile foundation drill 1 can be exploited, the universal joint 2nd which is below the rotary drive 13 on the boom 12th attached, can be removed without much effort and later on the rotary drive again 13 be added.

Reference list

1

Pile foundation drilling rig

10th

Machine car

11

Leader, drilling mast

12th

boom

13

Rotary drive

14

Drill pipe connection

15

(Storage) funnel

16

Drill pipe

17th

Displacement and drilling tip

2nd

universal joint

21

upper connecting piece

22

Middle section

23

lower connecting piece

24th

elastic cuff

25th

first radial axis

26

second radial axis

27

upper sleeve connector

28

lower sleeve connection

α

Deflection angle

G

Soil

Z.

Drilling direction

Claims (8)

Pile foundation drilling machine with a boom (12) with a rotary drive (13), which is vertically displaceable on a leader (11) in the drilling direction (Z), a drill pipe connection (14) below the rotary drive (13) and a storage hopper (15) above the rotary drive (13) for a concrete suspension to be introduced, characterized in that a universal joint (2) is arranged between the rotary drive (13) and the drill pipe connection (14), which is fastened to the rotary drive (13) with an upper connecting piece (21) and with a lower connecting piece (23 ) forms the drill pipe connection (14), an elastic sleeve (24) being provided in the universal joint (2), which sealingly connects the upper to the lower connecting piece (21, 23). Pile foundation drilling rig after Claim 1 , characterized in that the elastic sleeve (24) has an inner diameter which is greater than or equal to the free inner diameter of the connecting piece (21, 23). Pile foundation drilling rig after Claim 2 , characterized in that the inner diameter of the connecting piece (21, 23) is so large that a pile reinforcement cage can be pushed through. Pile foundation drilling rig after Claim 1 , 2nd or 3rd , characterized in that the elastic sleeve (24) is made of rubber. Pile foundation drilling machine according to one of the preceding claims, characterized in that the elastic sleeve (24) allows the universal joint (2) to be adjusted by a deflection angle with α ≤ 5 ° in all directions to the drilling direction (Z) predetermined by the leader (11). Pile foundation drilling device according to one of the preceding claims, characterized in that the cardan joint (2) has an annular central part (22) which is flat in the radial plane with respect to the drilling direction (Z) and which is connected to the upper connecting piece (21) via a first radial axis (25) and to the lower one Connection piece (23) via a second radial axis (26), which is oriented at 90 ° to the first radial axis (25), is pivotally articulated. Pile foundation drilling rig after Claim 6 , characterized in that the elastic sleeve (24) is carried out within the middle part (22) between the upper connecting piece (21) and the lower connecting piece (23). Pile foundation drilling rig after Claim 6 or 7 , characterized in that the universal joint (2) between the upper connecting piece (21) and the central part (22) on the one hand and between the central part (22) and the lower connecting piece (23) on the other hand has counterforce elements which are strong with the deflection amount when deflected generate increasing restoring force.

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