Mast assembly for a construction machine and method for same

Abstract

The invention relates to a mast arrangement for a construction machine comprising a base mast with a linear guide for slidably guiding a work carriage along the base mast, a mast extension which can be detachably attached to an underside of the base mast for extending the base mast and the linear guide downwards, and a connecting device with which the mast extension is detachably attached to the base mast. According to the invention, the connecting device is arranged within the base mast and / or the mast extension and comprises at least one actuating device with which at least one locking element can be adjusted between a retracted unlocked position, in which the mast extension is detached from the base mast, and an extended locking position, in which the mast extension is held and locked to the base mast by the at least one locking element.

Description

[0001] The invention relates to a mast arrangement for a construction machine with a base mast which has a linear guide for displaceably guiding a work carriage along the base mast, a mast extension which is detachably attachable to an underside of the base mast for extending the base mast and the linear guide downwards, and a connecting device with which the mast extension is detachably attached to the base mast, according to the preamble of claim 1.

[0002] The invention further relates to a method for extending a base mast with a linear guide downwards with a mast extension, according to the preamble of claim 15.

[0003] Mast arrangements with a mast which has a linear guide on its front side for the movable guidance of a work carriage are frequently used on construction machinery, as is generally known from the document DE 84 35 121 U1.

[0004] A rotary drilling drive, a vibrator or a ram can be arranged on the work carriage in order to carry out a civil engineering process.

[0005] The mast assembly is typically mounted on a preferably mobile carrier device via a linkage mechanism. The linkage mechanism allows the mast assembly to be adjusted vertically to a certain extent. Typically, the mast assembly is designed to be as tall as possible in order to accommodate correspondingly long drilling tools, bored piles, or sheet piles.

[0006] In certain cases, however, it may be desirable for the mast assembly to extend as far down as possible, close to the ground surface. In certain cases, the linkage mechanisms on construction machinery are not designed to lower a single mast or leader assembly close to the ground surface, for example due to the design of the carrier device. For relatively long work tools, such as a sledge hammer for driving planks, it may also be desirable to increase the travel range along the mast. For this case, it is known to attach a mast extension to the underside of a base mast. Such a mast extension can usually have a length of 1 to 3 meters. The mast extension must be positioned accordingly on the underside and fastened manually using screw bolts. This is time-consuming and labor-intensive.

[0007] The invention is based on the TaskThe aim is to specify a mast arrangement and a method with which a mast extension can be carried out particularly efficiently.

[0008] The object is achieved according to the invention by a mast arrangement according to the features of claim 1 or by a method having the features of claim 15. Preferred embodiments of the invention are specified in the dependent claims.

[0009] According to the invention, the mast arrangement is provided such that the connecting device is arranged within the base mast and / or the mast extension and comprises at least one actuating device with which at least one locking element can be adjusted between a retracted unlocking position, in which the mast extension is released from the base mast, and an extended locking position, in which the mast extension is firmly held and locked to the base mast by the at least one locking element.

[0010] A basic idea of ​​the invention is to provide a connecting device with an activatable actuating device, with which one or preferably several locking elements can be adjusted between a retracted unlocking position within a receiving space of the base mast and / or the mast extension and a locking position in which the mast extension is locked and secured to the base mast by the one or several locking elements. The actuating device can be operated manually, for example via a manual drive element, such as a hand crank, or via a power-driven drive for adjusting the one or several locking elements.

[0011] According to a further aspect of the invention, the connecting device with the actuating device is arranged on the base mast and / or the mast extension in such a way that, immediately after the mast extension has been fed to the underside of the base mast, wherein an axial plug-in connection can initially be formed, the firm connection can be established by simply activating the actuating device. In the fed position, the actuating device is located within the base mast and / or the mast extension. This protects the connecting device and also saves space. In this way, a mast extension can be safely and quickly attached and removed from a base mast of a mast arrangement. The mast arrangement can be formed solely from the base mast or as a multi-part mast arrangement, in particular as a telescopic leader arrangement.

[0012] A preferred embodiment of the invention consists in that the actuating device comprises a rotatably mounted threaded spindle on which the at least one locking element is adjustably mounted. Via a threaded spindle, a rotary movement can be converted into a linear adjustment movement of the at least one locking element, corresponding to a spindle drive. Such a spindle drive is structurally simple and space-saving.

[0013] A particularly compact actuating device can be achieved according to a further development of the invention in that the threaded spindle is designed with an external thread and / or an internal thread, which engages with a corresponding internal thread or external thread on the locking element for adjusting the locking element. This achieves a spindle drive with which a rotary movement of the threaded spindle is converted into an axial displacement movement of the at least one locking element. Preferably, the threaded spindle has at least one external thread, on which a sleeve- or cup-shaped locking element with a matching internal thread on its inside sits. Alternatively, the threaded spindle can also be completely or partially tubular, with an internal thread formed on the inside.

[0014] InThis can engage a rod-shaped element of the locking element with a suitable external toothing to form a spindle drive.

[0015] According to a further development of the invention, the compactness of the arrangement can be further improved by providing the threaded spindle with two opposing external threads and / or internal threads in its end region, each of which has a locking element arranged for movement in opposite directions. Thus, with the rotational movement of a single threaded spindle, two locking elements can be extended in opposite directions or retracted toward each other. By arranging two locking elements on one threaded spindle, a certain degree of compensation for opposing axial forces during movement of the locking elements can also be achieved.

[0016] A further preferred embodiment of the invention consists in that the locking element is designed as a bolt or a sleeve which can be inserted into corresponding receiving holes on the base mast and / or the mast extension for locking. The locking element is preferably cylindrical on its outer side and can be inserted into correspondingly matching receiving holes on the base mast and / or the mast extension. Coaxial receiving holes are preferably arranged on the base mast and the mast extension in order to achieve particularly good locking. One or more axially directed centering elements, in particular centering bolts, can also be arranged on the mast extension and can be inserted into corresponding centering holes on the underside of the base mast for axial centering and alignment of the two mast parts.

[0017] In principle, some or all of the centering bolts can also be arranged in reverse on the base mast, and the mounting holes can then be arranged accordingly on the mast extension. If the bolt is sleeve-shaped or tubular, it can have a closed base or a cover cap on its front side.

[0018] A further development of the mast arrangement according to the invention results from the fact that the actuating device has at least one drive section, via which a drive force can be applied to adjust the locking element. The drive force can be generated manually by an operator or by means of a drive, in particular a motor.

[0019] In particular, it is advantageous that the drive section is formed on a threaded spindle for applying a torque. Thus, the drive section can set the threaded spindle in a rotary motion, with an axial adjusting movement of the at least one locking element being effected via a spindle drive formed by the threaded spindle.

[0020] It is particularly advantageous that the drive section is designed as a drive pin or drive hole on one end face of the threaded spindle. This allows for particularly efficient introduction of torque into the threaded spindle. A drive pin can be, for example, a polygonal pin, in particular a square pin, or a screw head. A drive hole can also be designed as an internal polygonal hole, such as an internal square or hexagonal hole, through which torque can be introduced directly into the threaded spindle.

[0021] A further preferred embodiment of the invention is that the drive section comprises a drive wheel on the threaded spindle. The drive wheel can be arranged on an end face or in a central region of the threaded spindle. The drive wheel can, in particular, have a toothing that meshes with another gear, such as a pinion, of a drive. It is also possible to drive the drive wheel via a chain.

[0022] In principle, the movement device can be driven manually, for example via a hand crank or a hand-operated tool. According to a further development of the invention, it is particularly advantageous that an energy-driven drive, in particular an electric rotary motor, is installed or can be arranged as required to drive the actuating device. A hydraulically or pneumatically operated drive, in particular a hydraulic rotary motor, can also be provided as the energy-driven drive. The drive can be permanently attached or can be fed to the actuating device. In particular, a so-called cordless screwdriver with a corresponding drive element can be used by an operator to drive the actuating device for locking and / or unlocking.

[0023] According to a further development of the mast arrangement according to the invention, particularly efficient actuation can be achieved by arranging at least two actuating elements, in particular two or more threaded spindles, parallel to one another. Particularly when multiple threaded spindles are arranged, these can be operated either individually or jointly via a drive, for example, when drive wheels on the threaded spindles are meshingly connected to one another. Depending on the desired strength of the connection, a corresponding number of actuating devices with locking elements can be arranged.

[0024] A further preferred embodiment of the invention consists in providing an adapter unit which is arranged on the underside of the base mast and is designed to receive the at least one fastening device. By means of an adapter unit, in particular conventional masts can be retrofitted to construction machinery. The adapter unit can be attached, in particular screwed, to the underside of the base mast. The adapter unit can be part of the connecting device with which the mast extension is attached to the base mast via the adapter unit. Preferably, the adapter unit can represent the part of the connecting device formed on the base mast, with which the corresponding part of the connecting device is attached to the mast extension.

[0025] In principle, the base mast can be formed by a single mast. It is preferred that a work carriage is mounted on a front side of the base mast so as to be linearly movable. According to a further development of the invention, the mast arrangement can also be designed such that the base mast is a mast element of a telescopic leader arrangement. A telescopic leader arrangement can have a first mast element with a first linear guide as a guide mast, on which a second mast element is mounted so as to be displaceable, i.e. telescopic, as a possible base mast. The mast extension can preferably be arranged on this displaceable second mast element. In general, it is possible that, alternatively or additionally, a mast extension is also arranged according to the invention on the first mast element of the telescopic leader arrangement.

[0026] A preferred embodiment of the invention consists in that the telescopic leader arrangement has a guide mast as a first mast element, along which the base mast is displaceably mounted as a second mast element, in that the mast extension is attached to the base mast and in that at least one support roller is mounted on the mast extension, which can be supported on the guide mast when the base mast is displaced. By means of this further development according to the invention, the base mast, which is displaceably mounted on a guide mast, in a telescopic leader arrangement can be extended downwards. In this case, reliable guidance and support relative to the guide mast during displacement can be achieved on the mast extension in that at least one support roller, preferably two or more support rollers, are arranged on the mast extension, preferably in a lower region of the mast extension.When the base mast is moved, at least one support roller can engage a guide surface of the guide mast, thus supporting itself against the guide mast. This allows for safe guidance of the base mast with the mast extension on the guide mast.

[0027] The invention further comprises a construction machine, in particular a piling rig, with a support unit, in particular a movable one, wherein a mast arrangement according to the invention is arranged on the support unit. The piling rig can have a percussion or hammer device for performing a piling operation. The hammer device can be arranged on the work carriage.

[0028] In principle, the construction machine can also be a drilling rig with a drilling rig carriage that can be moved along the mast or a trench wall cutter with a linearly guided trench wall cutter, a vibrator with a vibration drive that can be moved along the mast or another civil engineering machine with a base mast with linear guide.

[0029] In general, the construction machine can be designed with a stationary carrier unit. Preferably, the carrier unit is movable, and can, in particular, have a crawler chassis, a wheeled chassis, or a rail-mounted chassis.

[0030] The method according to the invention for extending a base mast is characterized in that a mast assembly according to the invention, as described above, is used with a connecting device. This method allows for efficient use of an existing mast assembly, particularly on a construction machine, whereby a mast extension can be attached to and / or removed from a base mast as needed.

[0031] The invention will be further described below with reference to preferred embodiments, which are schematically illustrated in the drawings. In the drawings: Fig. 1 a side view of a construction machine with a mast arrangement according to the invention before the attachment of a mast extension; Fig. 2 a side view corresponding Fig. 1 when attaching the mast extension; Fig. 3 a side view of the construction machine after the Figures 1 and 2with a mounted mast extension; Fig. 4 a side view of the construction machine according to the Figures 1 to 3 with an additional hammer or ramming device; Fig. 5 an enlarged view of a mast extension with an adapter unit; Fig. 6 a front view of the mast extension of Fig. 5 ; Fig. 7 a cross-sectional view of the mast extension of Fig. 6 according to section AA; Fig. 8 a further cross-sectional view of the mast extension according to Fig. 6 according to section BB; Fig. 9 an enlarged detail of the mast extension according to Fig. 6 according to detail C; Fig 10 a further detailed view of the mast extension according to Fig. 6 with the adapter unit; Fig. 11 a perspective view of the mast extension without the adapter unit; and Fig. 12 a perspective view of the adapter unit.

[0032] A mast arrangement 20 according to the invention on a construction machine 10 is shown in the Figures 1 to 4shown. The construction machine 10 has a carrier unit 12, which, according to the illustrated embodiment, can have a mobile undercarriage 13 and a superstructure 14 rotatably mounted thereon. An operating cabin for a machine operator can be arranged on the superstructure 14. The mast arrangement 10 according to the invention can be adjustably mounted on the carrier unit 12 via a basically known articulation mechanism 16 with adjustment cylinders 17. The mast arrangement 10 can, according to the illustrated embodiment, be designed as a telescopic leader arrangement 21. This can have a guide mast 22, which is preferably mounted vertically displaceably on a mast holder 28 by means of a telescopic cylinder 18, in particular a hydraulic cylinder for telescoping. The mast holder 28 is connected to the articulation mechanism 16.

[0033] A base mast 30 with a linear guide 32 on its front side can be slidably mounted along the guide mast 22. The base mast 30 can be slidably mounted relative to the guide mast 22 via a drive device (not shown in detail). A work carriage 40 is slidably mounted and guided along the linear guide 32 of the base mast 30. The work device carriage 40 is designed to hold a Figure 1 not shown work equipment, such as a drilling drive, a vibrating device or similar.

[0034] A mast head 34 can be arranged on the top side of the base mast 30, which can, for example, have deflection rollers for a support cable for moving the work carriage 40. A mast extension 50 can be attached to an underside of the base mast 30, wherein the mast extension 50 can be Figure 1 shown before assembly and accommodated in a frame 5 for transport and assembly.

[0035] To attach the mast extension 50, the frame 5 with the mast extension 50 is positioned on the mast assembly 10 below the base mast 30, as clearly shown in Figure 2 is shown. In this position, the base mast 30 can now be moved downwards to the mast extension 50, which is positioned on the ground by means of the frame 5, and brought into contact with it. The mast extension 50 can then be attached to the underside of the base mast 30, so that the mast extension 50 can be moved with the base mast 30 along the guide mast 22, as clearly shown in Figure 3 The frame 5 can be removed after the mast extension 50 has been installed. The frame 5 can be reinserted in a similar manner to receive and hold the mast extension 50 when the mast extension 50 is dismantled.

[0036] The Figure 3It can be seen in particular that at least one support roller 56 can be arranged in a lower region of the mast extension 50, which support roller can come into contact with a guide surface of the guide mast 22 in a supporting manner when the base mast 30 is moved upwards with the mast extension 50. The mast extension 50 can have a front linear guide 52, which can be flush with the linear guide 32 of the base mast 30. The linear guide 52 on the mast extension 50 can in particular be designed such that it represents an extension of the linear guide 32 of the base mast 30. Thus, the work carriage 40 and / or a work device can be guided by the base mast 30 up to a lower region of the mast extension 50 and can also be moved along the linear guide 52. Thus, the work carriage 40 and / or a work device arranged thereon can be moved into a position close to the ground.

[0037] This can be particularly advantageous when using a ramming or impact device 42, which is not directly attached to the work carriage 40, but rather via a holding cable 41 on the work tool carriage 40, as clearly shown in Figure 4 The impact device 42 can have its own carriage 43 with guide shoes, which can cooperate with the linear guide 32 on the base mast 30 and the linear guide 52 on the mast extension 50 for guiding displacement.

[0038] A mast extension 50 for a mast arrangement 20 according to the invention is further described in connection with the Figures 5 to 11 explained. According to Figure 5 a rod-shaped mast extension 50 with two front linear guides 52 and support rollers 56 at a lower area is shown.

[0039] In Figure 5An adapter unit 44 with an internal cavity is arranged on the upper side of the mast extension 50. The adapter unit 44 can generally be fastened in advance to the underside of the base mast 30 using the schematically shown connecting elements 45. For rapid attachment of the mast extension 50 to the adapter unit 44 of the base mast 30, a connecting device 60 is provided, which in the illustrated embodiment comprises two actuating devices 70, which are described in more detail below. Two guide rails are located along the mast extension 50 to form the linear guide 52, which can continue on the adapter unit 44 and the base mast 30.

[0040] The Figures 6 to 8The arrangement of two support rollers 56 can be seen, which can be mounted on a lower region of the mast extension 50 on a toggle lever mechanism 57 that is adjustable relative to the longitudinal direction of the mast extension 50. The toggle lever mechanism 57 can have an upper toggle lever 58 and a lower toggle lever 59, which are articulated to one another in the region of a roller axis of the support rollers 56. The lower toggle lever 59 can be articulated to the mast extension 50, while the upper toggle lever 58 can be mounted on the mast extension 50 in addition to an articulated mounting and can also be mounted so that it can be displaced longitudinally in a longitudinally extending slot 55 on the mast extension 50.Using a linear drive 54, such as a spindle drive, the upper toggle lever 58 can be axially positioned, thus adjusting the toggle lever mechanism 57, at which position the support rollers 56 protrude transversely to the mast's longitudinal direction and securely engage the guide mast 22 of a telescopic leader assembly 21. The toggle lever mechanism 57 allows for flexible adjustments and changes in the position of the support rollers 56.

[0041] For a simple and efficient attachment of the mast extension 50, the connecting device 60 is arranged on the top side of the mast extension 50, which is arranged according to the Figure 11 In the illustrated embodiment, it can comprise two parallel actuating devices 70. The actuating devices 70 each have a threaded spindle 74, which is rotatably mounted on parallel bearing plates 62 on the mast extension.

[0042] The detailed structure of the actuating devices 70 can be seen in particular in the cross-sectional views according to the Figures 7 and 8 be removed. On each threaded spindle 74, a sleeve-shaped locking element 72 is slidably mounted at both end areas. On the inside of the sleeve-shaped locking element 72, an internal thread is arranged, which meshes with a corresponding external thread of a threaded section on the threaded spindle 74. Two opposite threaded sections with oppositely directed external threads are arranged on each threaded spindle 74, so that upon rotation of the threaded spindle, the locking elements 72 are each moved in opposite directions. The locking elements 72 can be moved from an inwardly retracted unlocking position, which in the Figures 7 and 8 shown, moved outwards into a locking position. InIn the locking position, the locking elements 72 each engage in an associated locking hole 48, which can be formed on the adapter unit 44.

[0043] A rotary movement can be applied to one end face of each threaded spindle 74 via a drive section 80 via a correspondingly designed drive hole 82 or a drive pin via a drive device (not shown). The drive section 80 is particularly shown in the enlarged illustration according to Figure 7 The drive device can be a hand-operated tool, such as a crank, or a device with a drive motor, such as a cordless screwdriver.

[0044] The locking holes 48 can, in principle, also be formed directly on a lower portion of the base mast 30. In particular, a simple retrofitting or conversion of an existing base mast 30 can be achieved by means of an adapter unit 44, which is pre-attached to the underside of the base mast 30 to establish the connection. Such an adapter unit 44 is clearly shown in Figure 12 shown.

[0045] The adapter unit 44 can be attached to the underside of the base mast 30 via connecting elements 45, which can preferably comprise screws. The preferably screw-like connecting elements 45 can be actuated from the side or preferably from below through an internal cavity of the adapter unit 44.

[0046] The connecting device 60 with the actuating devices 70 on the mast extension 50 can be inserted into the inner receiving space or cavity of the adapter unit 44. Once the mast extension 50 is positioned axially aligned in the connecting position on the base mast 30, the actuating devices 70 can be actuated, whereby the locking elements 72 are extended outward into the corresponding locking holes 48 on the adapter unit 44. This allows a reliable multi-point locking system to be achieved.

[0047] To release the mast extension 50, the actuating devices 70 can be actuated in the reverse manner, whereby the locking elements 72 are retracted inward by means of the threaded spindle 74 and thus withdrawn from the locking holes 48. In this position, the mast extension 50 can be pulled downward again and, in particular, re-received in the frame 5 according to Figures 1 and 2. A securing and / or detection device can be arranged to ensure or check whether the mast extension 50 is securely received in the frame 5 upon release.

Claims

1. Mast assembly for a construction machine (10) having - a base mast (30), which has a linear guide (32) for displaceably guiding a working carriage (40) along the base mast (30), - a mast extension (50), which can be detachably attached to an underside of the base mast (30) in order to extend the base mast (30) and the linear guide (32) downwards, and - a connection device (60), with which the mast extension (50) is detachably attached to the base mast (30), characterised in that the connection device (60) is arranged within the base mast (30) and / or the mast extension (50) and comprises at least one actuation device (70) with which at least one locking element (72) can be displaced between a retracted unlocking position, in which the mast extension (50) is released from the base mast (30), and an extended locking position, in which the mast extension (50) is firmly held and locked to the base mast (30) by the at least one locking element (72).

2. Mast assembly according to claim 1, characterised in that the actuation device (70) has a rotatably mounted threaded spindle (74), on which the at least one locking element (72) is adjustably mounted.

3. Mast assembly according to claim 2, characterised in that the threaded spindle (74) is designed with an external thread and / or an internal thread, which thread engages with a corresponding internal thread or external thread on the locking element (72) in order to adjust the locking element (72).

4. Mast assembly according to claim 3, characterised in that the threaded spindle (74) has two oppositely directed external threads and / or internal threads at its end region, on each of which a locking element (72) is arranged for movement in opposite directions.

5. Mast assembly according to any one of claims 1 to 4, characterised in that the locking element (72) is designed as a bolt or a sleeve that can be inserted into corresponding receiving holes (38) on the base mast (30) and / or the mast extension (50) for locking.

6. Mast assembly according to any one of claims 1 to 5, characterised in that the actuation device (70) has at least one drive section (80), via which a drive force can be applied for adjusting the locking element (72).

7. Mast assembly according to claim 6, characterised in that the drive section (80) is designed on a threaded spindle (74) for applying a torque.

8. Mast assembly according to claim 7, characterised in that the drive section (80) is designed as a drive pin or drive hole (82) on an end face of the threaded spindle (74).

9. Mast assembly according to any one of claims 1 to 8, characterised in that an energy-operated drive, in particular an electric rotary motor, is mounted or can be arranged as required to drive the actuation device (70).

10. Mast assembly according to any one of claims 1 to 9, characterised in that at least two actuation devices (70), in particular two or more threaded spindles (74) are arranged parallel to one another.

11. Mast assembly according to any one of claims 1 to 10, characterised in that an adapter unit (44) is provided, which is arranged on the underside of the base mast (30) and is designed to receive the at least one actuation device (70).

12. Mast assembly according to any one of claims 1 to 11, characterised in that the base mast (30) is a mast element of a telescopic leader assembly (21).

13. Mast assembly according to claim 12, characterised in that the telescopic leader assembly (21) has a guide mast as a first mast element, along which guide mast the base mast (30) is displaceably mounted as a second mast element, in that the mast extension is attached to the base mast (30), and in that at least one support roller is mounted on the mast extension (50) and can be supported on the guide mast (22) when the base mast (30) is displaced.

14. Construction machine, in particular a pile driver, having an, in particular travelling, carrier unit (12), characterised in that a mast assembly (20) according to any one of claims 1 to 13 is arranged on the carrier unit (12).

15. Method for extending a base mast (30) having a linear guide (32) downwards with a mast extension, characterised in that a mast assembly (20) according to any one of claims 1 to 13 having a connection device (60) is used.

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