阅读说明：本技术 地下工程机和用于在地面中创建缝隙的方法 (Underground working machine and method for creating a gap in the ground ) 是由 C·施滕格尔 于 2021-06-04 设计创作，主要内容包括：地下工程机和借助地下工程机在地面中创建缝隙的方法,根据本发明提出,上部的第一夹紧滑块和下部的第二夹紧滑块以能够行驶的方式支承在桅杆处,上部的第一夹紧滑块具有用于以能够松脱的方式夹紧杆形的保持装置的第一夹紧装置,下部的第二夹紧滑块具有用于以能够松脱的方式夹紧杆形的保持装置的第二夹紧装置,第一夹紧滑块和第二夹紧滑块能够相对于彼此行驶,下部的第二夹紧滑块设有用于安装附加的升降设备的连接装置,该附加的升降设备布置在地面处,借助该附加的升降设备能够在纵向上施加力到第二夹紧滑块上。(According to the invention, an upper first clamping slide and a lower second clamping slide are mounted on a mast in a drivable manner, the upper first clamping slide having a first clamping device for releasably clamping a rod-shaped holding device, the lower second clamping slide having a second clamping device for releasably clamping a rod-shaped holding device, the first and second clamping slides being drivable relative to one another, the lower second clamping slide being provided with a connecting device for attaching an additional lifting device, which is arranged on the ground and by means of which a force can be exerted in the longitudinal direction on the second clamping slide.)

1. An underground working machine, comprising:

a substantially vertical mast (20),

-a slotted wall appliance (70) supported in a movable manner in the longitudinal direction of the mast (20) for creating a slot (7) in the ground (5), and

-a rod-shaped holding device (60) at the lower end of which the slotted wall appliance (70) is mounted and by means of which the slotted wall appliance (70) can be moved linearly along the mast (20),

it is characterized in that the preparation method is characterized in that,

-an upper first clamping slide (30) having a first clamping device (34) for releasably clamping the rod-shaped holding device (60) and a lower second clamping slide (40) having a second clamping device (44) for releasably clamping the rod-shaped holding device (60) are mounted so as to be able to travel on the mast (20), the first clamping slide (30) and the second clamping slide (40) being able to travel relative to one another and

-the lower second clamping shoe (40) is provided with a connection device (48) for mounting an additional lifting device (50) arranged at the ground (5) by means of which a force can be exerted on the second clamping shoe (40) in the longitudinal direction.

2. An underground working machine according to claim 1,

it is characterized in that the preparation method is characterized in that,

the first clamping device (34) and the second clamping device (44) can be actuated independently of one another by a control device for alternately clamping the rod-shaped holding device (60).

3. An underground working machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the slotted wall tool (70) is configured as a slotted wall milling machine or a slotted wall fixture.

4. An underground working machine according to any one of claims 1 to 3,

it is characterized in that the preparation method is characterized in that,

the holding device (60) is longer than the mast or is formed by a plurality of mast elements.

5. An underground working machine according to any one of claims 1 to 4,

it is characterized in that the preparation method is characterized in that,

the rod-shaped holding device (60) is tubular in shape.

6. An underground working machine according to any one of claims 1 to 5,

it is characterized in that the preparation method is characterized in that,

at least the upper first clamping slide (30) is drivable along the mast (20) in a drivable manner.

7. An underground working machine according to any one of claims 1 to 6,

it is characterized in that the preparation method is characterized in that,

the connecting device (48) has at least one connecting eye (49) oriented transversely to the longitudinal direction, wherein, in order to achieve a releasable connection between the lifting cylinder (54) of the lifting device (50) and the second clamping slide (40), a locking bolt (58) can be inserted through a fastening hole (56) of the lifting cylinder (54) and the at least one connecting eye (49).

8. Lifting installation for an underground working machine (10) according to any one of claims 1 to 7,

it is characterized in that the preparation method is characterized in that,

the lifting device has a lower jacket frame (52) for placing on the ground (5) and at least one lifting cylinder (54) which is fastened on the one hand to the jacket frame (52) and on the other hand is provided with a connecting element for connecting to a clamping slide (40).

9. The lifting device as claimed in claim 8,

it is characterized in that the preparation method is characterized in that,

two or more lifting cylinders (54) are arranged, which are preferably designed as hydraulic cylinders.

10. Lifting device according to claim 8 or 9,

it is characterized in that the preparation method is characterized in that,

the nesting frame (52) is designed in the form of a ring or a partial ring and has a central channel (53) for a rod-shaped holding device (60).

11. Method for creating a gap (7) in the ground (5) by means of an underground working machine (10) according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

by means of the rod-shaped holding device (60), the wall-cutting tool (70) is driven into the ground (5) while cutting soil material, wherein a gap (7) is created,

running the rod-shaped holding device (60) along the mast (20) by means of at least one of the clamping slides (30, 40),

the lower second clamping shoe (40) is releasably connected to an additional lifting device (50), in particular a lifting device (50) according to one of claims 7 to 10, which is placed on the ground (5) and which is attached to the ground (5)

The second clamping slide (40) is fixed to the holding device (60) by means of the second clamping device (44), and a lifting force is applied to the holding device (60) and the slotted wall element (70) by means of the additional lifting device (50).

12. The method of claim 11, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

at the time of digging down, at least one additional rod element is attached to the rod-shaped holding device (60) for elongation.

13. The method according to claim 11 or 12,

it is characterized in that the preparation method is characterized in that,

filling the gap (7) with a hardenable mass for forming a slotted wall section in the ground (5).

14. The method of claim 13, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

the hardenable mass is formed in situ in the gap during milling.

15. The method of any one of claims 11 to 14,

it is characterized in that the preparation method is characterized in that,

-applying the lifting force by the lifting device (50) when pulling the slit wall appliance (70) out of the ground (5).

Technical Field

The invention relates to an underground working machine having a substantially vertical mast, a slotted wall appliance supported in a movable manner in the longitudinal direction of the mast for creating a slot in the ground, and a rod-shaped holding device, which is mounted at its lower end and by means of which the slotted wall appliance can be moved linearly along the mast.

The invention further relates to a method for creating a gap in the ground by means of such an underground engineering machine according to the preamble of claim 11.

Background

Slotted wall appliances with a guide frame of the scaffold type with guide plates suspended at ropes are known. By means of the guide frame, such a slotted wall appliance can guide itself in the formed slot. Due to the rope suspension, very large gap depths can easily be achieved. However, such slotted wall appliances with a guide frame of the scaffold type with guide plates are very large and therefore very expensive in terms of manufacture, maintenance and transport.

EP 1452645B 1, which forms this generic term, discloses an underground engineering machine with a slotted wall tool which is embodied as a slotted wall milling machine without a guide frame. Such compact milling machines are guided by rod-shaped holding devices which are guided in a linearly displaceable manner in guide sleeves at the masts of the carrier device. The rod-shaped holding device is suspended in this case on a cable which is guided via the top end of the mast. By means of the lifting winch at the carrier device, the cable can be operated to lift and lower the rod-shaped holding device and thus the slot wall device.

In principle, in the case of such an underground working machine, the gap depth is limited to the length of the rod-shaped holding device, which in turn depends on the length of the mast of the underground working machine. In the case of undermining, the retaining device can be extended by attaching additional rod elements. In this case, however, the total weight of the suspended (angel ä ngt) load that can be applied by the lifting device of the underground working machine when pulled back from the ground increases. If the slot wall tool jams in the slot while pulling (the greater the slot depth, the more likely this occurs), the maximum power and tractive effort of the underground working machine may be exceeded.

The traction force required to possibly restore a skewed slit wall implement can be significantly greater than the traction force required to create a slit wall of a carrier implement. Therefore, a carrier appliance is typically selected that is oversized to actually create the slit walls. This carrier device is more expensive and heavier than a carrier device with sufficient walls for a pure slot creation and leads to increased logistics costs in addition to the pure device costs in terms of acquisition and operation. There is therefore a need for a solution which enables a more economical carrier appliance to be used and nevertheless enables the slotted wall appliance to be restored in the event of a skew of the slotted wall appliance.

Disclosure of Invention

The object on which the invention is based is to specify an underground working machine and a method for creating a gap in the ground by means of a slotted wall appliance, by means of which gap even with large depths can be produced economically with a further compact constructional size of the underground working machine.

This object is achieved, on the one hand, by an underground engineering machine according to claim 1 and, on the other hand, by a method having the features of claim 11. Preferred embodiments of the invention are given in the respective dependent claims.

The underground working machine according to the invention is characterized in that an upper first clamping slide and a lower second clamping slide are mounted in a drivable manner on the mast, the upper first clamping slide having a first clamping device for releasably clamping the rod-shaped holding device, the lower second clamping slide having a second clamping device for releasably clamping the rod-shaped holding device, the first and second clamping slides being drivable relative to one another, the lower second clamping slide being provided with a connecting device for attaching an additional lifting device, which is arranged on the ground and by means of which a force can be exerted in the longitudinal direction on the second clamping slide.

A first aspect of the invention consists in providing two clamping slides with clamping devices for actuating and driving the rod-shaped holding device, by means of which the rod-shaped holding device can preferably be gripped alternately. A releasable force-locking and/or form-locking connection can be established by the clamping device. At least one of the clamping devices can clamp the holding device at any desired position. This enables the rod-shaped holding device to be moved step by step along the mast together with the slotted wall tool mounted thereon. The maximum length of the possible steps corresponds here approximately to the length of the mast. By this arrangement and practice, it is preferably possible to use a bar element that is significantly longer than the mast. Alternatively, additional rod elements can be installed almost arbitrarily for extending the rod-shaped retaining device and can be removed again step by step after the downward cutting of the slot. In both cases, a relatively large gap depth can be achieved, which is greater than the length of the mast and can even be several times the length of the mast.

According to a further aspect of the invention, the lower second clamping shoe is provided with a connecting device for mounting an additional lifting device, which is arranged on the ground and by means of which a force can be exerted in the longitudinal direction on the second clamping shoe. Thus, if necessary, for example in the case of a large gap depth and/or in the case of a slot wall appliance stuck in the gap, an additional lifting device can be quickly and easily mounted on the second clamping slide. In this way, the lifting device can exert an additional lifting force in the longitudinal direction of the mast via the second clamping slide on the rod-shaped holding device while fixing the second clamping slide, which is supported in a drivable manner at the mast. The total tractive effort of the underground working machine can thereby be increased considerably. Since the lifting device can be supported directly on the ground, the load of the mast or the tipping safety (Kippsicherheit) of the underground engineering machine is not negatively influenced thereby. On the contrary, the anti-rollover safety can even be increased by the generated reaction force.

A preferred embodiment of the invention consists in that the first clamping device and the second clamping device can be actuated independently of one another by the control device for alternately clamping the rod-shaped holding device. In principle, the rod-shaped holding device can be clamped simultaneously by the two clamping devices and can be moved by simultaneously moving at least two clamping slides.

Preferably, after the first downward extraction step, the upper first clamping slide can be released from the rod-shaped holding device and moved back upward again, while the rod-shaped holding device continues to be clamped and held by the passive lower second clamping slide. After the clamping of the rod-shaped holding device by the first active clamping slide which has been moved upwards, the clamping device of the second clamping slide can be released. The second clamping shoe can remain in the lower position and the further advancing step can be carried out by the downward travel of the upper first clamping shoe only. Conversely, the slot wall tool can be pulled out of the slot step by means of the first clamping slide.

By means of the slotted wall appliance, a slot, which is usually rectangular in cross section, can be created in the ground, as is known, for example, for forming a sealing wall or a supporting wall. According to one embodiment of the invention, the slot wall device is preferably designed as a slot wall milling machine or as a slot wall holder. In the case of a slotting wall milling machine, at least one milling wheel pair is provided, which is driven in rotation about a rotational axis oriented transversely or orthogonally to the longitudinal or downward digging direction. Preferably, two milling wheel pairs arranged parallel to one another are provided side by side at the slitting wall milling machine. In the case of a slotted wall clamp, two grapples (Greiferschaufel) are supported at the lower frame of the slotted wall appliance.

The frame of the slot wall appliance is preferably not designed with a guide frame with plate-shaped guide elements for bearing against the walls of the slot. The rod-shaped holding device is preferably designed as a guide rod, by means of which the slit wall appliance can be guided from outside the slit. In particular, the milling machine can be constructed as a so-called CSM milling machine, guiding the CSM milling machine from outside the slots.

The holding device can in principle be a single, continuous guide rod. According to a development of the invention, it is particularly preferred that the holding device is longer than the mast or is formed by means of a plurality of rod elements. The rod elements are releasably connected to one another and can be gradually engaged with one another, in particular during undermining. When pulling the slotted wall tool, the individual rod elements can be released again in steps. Preferably, the length of the rod element corresponds approximately to the length of a mast of the underground working machine. The holding device can also have a single mast which exceeds the length of the mast.

A particularly suitable embodiment variant of the underground working machine according to the invention consists in that the rod-shaped holding device is of tubular design. Data lines and energy lines can be laid in the interior of the tube, for example for supplying hydraulic fluid and/or electric current. Furthermore, one or more feed lines can be provided for supplying and/or discharging the suspension to the slot wall device. In particular, the slot wall device can be provided for an In-situ process (In-situ-Verfahren), In which a hardenable mass is produced In situ together with the milled soil material by supplying a hardenable suspension to a rotating milling wheel. The retaining device can guide the slotted wall appliance linearly along the mast.

According to a further embodiment variant of the invention, it is advantageous if at least the upper first clamping slide is driven in such a way that it can travel along the mast. The slide is guided in a movable manner along the mast at a linear guide. For example, a double-acting hydraulic cylinder or a cable winch assembly can be arranged as a linear drive at the mast. Preferably, only the upper first clamping slide is driven in a linearly drivable manner, while the lower second clamping slide, which does not have its own linear drive, is supported only movably at the mast. In principle, however, both clamping slides can be provided with their own linear drive at the mast. In addition, three or more clamping slides can also be provided at the mast.

The connecting means can be constructed in any suitable way that enables the desired force transmission. Bearing surfaces, spherical caps, screw connections or the like can be provided. In an advantageous embodiment of the invention, the connecting device has at least one connecting eye oriented transversely to the longitudinal direction, wherein, for the releasable connection between the lifting cylinder of the lifting device and the second clamping slide, a locking bolt can be inserted through the fastening bore of the lifting cylinder and the at least one connecting eye. A stable and easily releasable connection between the second clamping slide and the lifting device can thereby be achieved in a simple manner by the connecting device. Preferably, for each fastening hole, two laterally arranged connecting eyes are arranged at the lifting cylinder of the lifting device, so that a good force transmission from the lifting device to the second clamping slide is possible. In particular, a lifting force of the lifting device can be applied when pulling the slotted wall element, wherein the lifting force is directed upwards in the longitudinal direction of the mast.

However, it is also possible in principle to apply a lifting force downwards, for example when an additional propulsive force should be required upon impact on an obstacle. In this case, the lifting device can additionally be anchored at the ground.

The invention also comprises a lifting device, in particular for the underground working machine according to the invention described above, wherein the lifting device is characterized in that the lifting device has a lower nesting frame for placing on the ground and at least one lifting cylinder which is fastened on the one hand at the nesting frame and on the other hand is provided with a connecting element for connecting with a clamping slide. The lifting device can be releasably mounted, in particular in a simple manner, on the second clamping slide of the underground working machine described above.

The lifting device according to the invention thus constitutes a separate component, which does not necessarily need to be assigned to a single underground working machine. Instead, the lifting device can be stored as a spare part (vorgehalten) at a construction site with a plurality of underground works with slotted wall devices, so that the lifting device can be installed at a specific underground work only when needed for a limited time.

There can be a need in particular when the slotted wall appliance remains plugged into a slot filled with a settable suspension, for example because the slotted wall appliance has become stuck in the slot or a power failure or a reduction in power has occurred with existing pulling equipment at the underground working machine. By quickly installing the lifting device according to the invention, the slot wall appliance can be pulled out of the slot safely and reliably in this case. It is thus possible to prevent expensive slotted wall devices from being concreted in the slot when the suspension mass sets and thus being lost, or else to be able to be released again only with great effort.

According to one embodiment of the invention, it is particularly preferred that two or more lifting cylinders are arranged, which are preferably designed as hydraulic cylinders. The lifting cylinders are in particular distributed uniformly on the telescoping frame, so that a sufficient lifting force can be transmitted to the mounted clamping slide as symmetrically as possible. Particularly large forces can be generated by using hydraulic cylinders. By releasing the second clamping device and by resetting the second clamping slide by means of at least one lifting cylinder, the lifting step can be repeated as often as desired.

In addition, it is particularly preferred that the nesting frame is designed in the form of a ring or a partial ring, which has a central channel for the rod-shaped holding means. The encasement frame can thus be arranged bridge-like above the gap, which is usually provided at the upper edge with guide walls reinforced with concrete. The clamping slide can thus be pressed evenly symmetrically around the rod-shaped holding device by the telescoping frame, without a large tilting force being generated along the guide of the mast on which the clamping slide is mounted.

The method according to the invention for creating a gap in the ground by means of an underground working machine is characterized in that the wall-making appliance is driven into the ground under the removal of soil material by means of a rod-shaped holding device, wherein the gap is created, the rod-shaped holding device is driven along the mast by means of at least one of the clamping slides, the lower second clamping slide is releasably connected to an additional lifting device, which is placed on the ground, and the second clamping slide is fastened to the holding device by means of the second clamping device, and a lifting force is applied to the holding device and the wall-making appliance by means of the additional lifting device. The method can be carried out in particular with the underground working machine according to the invention described above or with the lifting device according to the invention described above.

Here, the previously described advantages can be achieved.

A preferred variant of the method according to the invention is that, during the sinking operation, at least one further rod element is attached to the rod-shaped holding device for elongation. This enables almost any gap depth to be achieved. At least when pulling the holding device, which is thus extended, an additional lifting device can be provided and used. Even relatively large gap depths can therefore be achieved with conventional carrier devices with limited tractive force, since the necessary lifting force can be exerted upwards by the additional lifting device when pulling a slotted wall device with an extended holding device in order to exert an increased tractive force. In this way, even for large gap depths, cost-effective, simple underground working machines can be used, which can be equipped and retrofitted with additional lifting devices if required.

According to a further method variant of the invention, it is particularly preferred to fill the gap with a mass that can be hardened in order to form the slotted wall section in the ground. In particular, a plurality of individual gaps can be formed side by side, so that after filling and hardening the mass, the gap walls can be created in the ground as a whole. The gap wall can be created as a sealing wall against the intrusion of groundwater or as a supporting wall for protecting the building pit. The filling of the hardenable mass can take place already during the creation of the gap or can take place after the creation of the gap in a so-called two-stage process.

It is particularly preferred that a mass that can be hardened is formed in situ in the gap during milling.

In principle, already during the downward digging operation, additional lifting or propulsion forces can be applied by the additional lifting device from the lifting device to the rod-shaped holding device and thus to the wall-cutting implement. According to a further development of the invention, it is particularly preferred that a lifting force is exerted by the lifting device when the slot wall appliance is pulled out of the ground. This can be done on schedule (for example in the case of a significantly lengthened and thus significantly weighted rod-shaped holding device) or only when needed (for example when the slotted wall tool is not clamped in the slot on schedule and the existing tractive force alone at the underground working machine is no longer sufficient).

Drawings

The invention will be further described hereinafter with reference to a preferred embodiment, which is schematically shown in the drawings. Shown in the drawings are:

FIG. 1 is a side view of an underground working machine according to the present invention;

FIG. 2 is a perspective view of the underground working machine of FIG. 1 according to the present invention;

FIG. 3 is an enlarged view of detail A according to FIG. 2;

FIG. 4 is an enlarged perspective view of detail B from FIG. 2; and

fig. 5 is a side view of detail B according to fig. 2 and 4.

Detailed Description

Referring to fig. 1 and 2, an underground working machine 10 according to the invention includes a carrier implement 12 having a crawler 14 on which an upper structure 16 is rotatably supported. A mast 20, which is substantially vertical in operation, is pivotably articulated at the superstructure 16 of the carrier implement 12 by means of an adjusting mechanism 18 having an adjusting cylinder.

Along the linear mast guide 22 at the front side of the mast 20, an upper first clamping slide 30 and a lower second clamping slide 40 are supported in a movable manner in the longitudinal direction of the mast 20. The rod-shaped holding device 60 is held and guided parallel to the mast 20 by the first clamping slide 30 and the second clamping slide 40. The construction and function of the first clamping shoe 30 and the second clamping shoe 40 are explained in more detail below in the context of fig. 3 and 4.

At the lower end of the mast 20, an additional lifting device 50 with a lifting cylinder 54 is arranged, which will be explained in more detail below in the context of fig. 4 and 5.

At the lower end of the rod-shaped holding device 60, a slotted wall tool 70 configured as a slotted wall milling machine is mounted. By means of the holding device 60, the wall appliance 70 can be lowered into the ground substantially vertically with the construction of the gap. The energy and data connection between the carrier appliance 12 and the slotted wall appliance 70 is established by a line 62 which is connected on the one hand to the carrier appliance 12 via the mast 20 and on the other hand to an attachment section 66 at the upper end of the rod-shaped holding device 60. In this case, the line 62 runs from an attachment section 66 at the upper end of the holding device 60 via the inner cavity of the tubular holding device 60 to the slot wall means 70. The line 62 is arranged in the form of a cable tow along the mast 20 and the holding device 60.

In the enlarged illustration of fig. 3, the upper end region of the mast 20 and of the rod-shaped holding device 60 is shown in greater detail. At the upper end of the rod-shaped holding device 60, a connecting section 64 is arranged, which can be used for lifting the holding device 60 by means of a crane and is furthermore configured for attaching further rod elements for axially lengthening the holding device 60.

At the upper end of the mast 20, a mast top 24 with an additional lifting device 26 is provided. Along the mast guide 22, the upper first clamping slide 30 is driven in a manner that can be moved or driven in the vertical direction or in the longitudinal direction of the mast 20. For driving purposes, a deflecting roller 28 for a drive cable, not shown, is provided in the region of the mast head 24, which drive cable is connected on the one hand to the winch 29 shown in fig. 1 at the mast 20 and on the other hand to the first slide base 32 of the first clamping slide 30 after being deflected by the deflecting roller 28.

By means of this first drive cable, a traction force can be applied to the first clamping shoe 30 in order to pull the clamping shoe 30 upwards in the longitudinal direction. At the lower end of the mast 20, in a manner known in principle, a further deflecting roller, not shown, of the drive is also provided, wherein a further drive cable leads from the winch 29 via the lower end of the mast 20 to the first clamping slide 30, so that in this way a traction force can be applied downwards to the first clamping slide 30.

Two lateral clamping cylinders 36, which are opposite one another, are arranged on the first clamping slide 30 on the first slide base 32 in order to form the first clamping device 34. A force-locking connection with the rod-shaped holding device 60 can be established by the first clamping device 34, so that the holding device 60 can be driven upwards or downwards in a longitudinally guided manner along the mast 20 by means of the first clamping slide 30. Alternatively or additionally, a form-locking connection can be established here, for example, by a locking element actuated by the clamping cylinder 36 engaging in a corresponding receptacle at the holding device 60. The holding device 60 can have a plurality of receptacles at different locations.

In fig. 4 and 5, the region of the lower end of the mast 20 is shown in detail, which has a second clamping slide 40 and a lifting device 50. The second clamping slide 40 is constructed similarly to the first clamping slide 30 and has a second slide base 42 which can be moved along the linear mast guide 22 at the mast 20. In the illustrated exemplary embodiment, the first clamping slide 30 is actively driven, while the second clamping slide 40 is not drivable by a drive device which is fixedly arranged on the carrier implement 12 or on the mast 20. The second clamping shoe 40 thus constitutes an element which can be moved passively in principle and which can be locked at the mast 20 if necessary. Two lateral clamping cylinders 46 are likewise arranged opposite one another on the second slide base 42 in order to form a second clamping device 44 for the force-locking clamping of a rod-shaped holding device 60. Alternatively or additionally, a form-locking clamping connection is also possible here.

In the normal operation of the attached underground working machine 10 without the additional lifting device 50, the passive second clamping slide 40 can be used as a so-called fall protection when the slot wall appliance 70 is pulled by means of the holding device 60. In this normal operation, when the slot wall tool 70 is pulled, the first clamping slide 30 is moved downward along the mast 20 in order to be connected in a force-fitting manner to the rod-shaped holding device 60 in the lower position. With such a downward travel of the first clamping shoe 30, the rod-shaped holding device 60 can be clamped and held by the lower second clamping shoe 40.

After the renewed clamping of the holding device 60 by the first clamping slide 30, the force-locking connection between the holding device 60 and the lower second clamping slide 40 can be released. In this state, the first clamping shoe 30 can now be moved upward together with the holding device 60 fixed thereto in order to pull the slot wall device 70 out of the slot 7 in the floor 5.

After this, the second clamping device 44 of the second clamping slider 40 can be activated again, so that the first clamping slider 30 can be released and the first clamping slider 30 can be moved downward again, in order to further pull the slot wall device 70.

If the traction force of the first clamping slide 30 is no longer sufficient during this process, for example because the slotted wall implement 70 has caught or clamped in the slot 7 in the floor 5 or because the total weight of the slotted wall implement 70 and the holding device 60 has increased significantly due to the additionally attached rod element, it is possible according to the invention to install additional lifting devices 50 at the lower end of the mast 20 and the lower second clamping slide 40.

The lifting device 50 has a C-shaped or U-shaped nesting frame 52 with a central channel 53 for a rod-shaped holding device 60. The encasement frame 52 is here laid onto the ground 5. The encasement frame 52 has a length which enables it to overlap the width of the gap 7 formed and to lie on the ground 5 on both sides of the gap 7 formed, as is clearly shown in fig. 5. The open side of the encasement frame 52 can be laterally abutted by the abutment element 55 to the lower end of the mast 20, while the encasement frame 52 does not necessarily need to be fixedly connected with the mast 20.

Supporting feet 21 for supporting the mast 20 at the ground 5 can be provided at the lower end of the mast 20 in a manner known in principle.

At the lower region of the second clamping slide 40, a connecting device 48 is formed, which in the exemplary embodiment shown is formed by a horizontally oriented connecting eye 49. Two lifting cylinders 54, each with a fastening hole 56, can be fastened by means of a transversely oriented locking bolt 58 at a respective connecting eye 59 of the connecting device 48. Lower ends of the lift cylinders 54 are respectively hinged at the sheathing frame 52 of the lift device 50.

Then, in order to exert an additional lifting force upwards, the lifting cylinder 54 can be extended when the second clamping slide 60 is connected in a force-locking manner to the rod-shaped holding device 60 by means of the second clamping device 44. In this way, the second clamping slide 40, which is mounted in a movable manner on the mast 20, can be pressed upward together with the holding device 60. Preferably, the lift cylinder 54 is oriented centrally with respect to the gap 7 in the ground 5 and parallel to the longitudinal direction of the mast 20, so that practically no lateral forces are exerted on the carrier implement 12. Thus, if necessary, a high lift force can be applied by the additional lifting device 50 without significantly impairing the roll stability of the underground working machine 10. The lifting process can be repeated step by step.

If necessary, additional propulsion forces can also be applied downwards in a corresponding manner by the lifting device 50 to the rod-shaped holding device 60 and to the slot wall appliance 70. In this case, the lifting device is anchored in the ground (not shown), for example by means of ground anchors, in order to prevent the jacking up (abheben) of the nested frame when an additional propulsive force is applied. If there is no need for additional lifting force, the lifting device 50 can be detached again by releasing the connection 48 and removed from the underground working machine 10.

In the illustrated embodiment, the slotted wall tool 70 is configured as a slotted wall milling machine having a tool frame 72 and a milling wheel 74 arranged at the tool frame. The slotted wall milling machine shown is constructed for the so-called CSM technology, wherein the appliance frame 72 has a circumferential dimension smaller than the milled cross section. Thus, the appliance frame 72 is spaced from the walls of the aperture 7 in the floor 5. The suspension can thus be introduced from the underground working machine 10 via the feed line 23 via a hose line, not shown in detail, into the gap 7 and mixed directly in situ in the gap 7 with the ground material to be cut by the milling wheel 74. The mixture thus produced can form what is known as a mortar (bodienm microstore), which hardens in the gap 7 into a slotted wall segment.