EP2561968B1 - Device for cutting a contraction joint - Google Patents

Description

The invention relates to a device for cutting a dummy joint in a concrete wall, according to the preamble of claim 1, comprising a support frame, a cutting device and a guide means fixed to the support frame by means of which the cutting device can be guided along the dummy joint to be cut, wherein the guide means a longitudinally adjustable Arm and wherein the arm is pivotally connected to the support frame.

Concrete walls can be made from precast or on-site. If the concrete walls are produced on site, cracks in the concrete wall are formed due to the reduction in volume of the hardening concrete, which forms "wild" cracks, ie disordered and irregular cracks in the concrete wall in the absence of post-treatment. To avoid such cracking dummy joints are introduced into the concrete wall at regular intervals. Under a dummy joint is to be understood as a cross-section of the provided with the dummy joint concrete wall weakening, but not completely severing notch. Such dummy joints are also referred to as a notch.

Similar to a predetermined breaking point, the dummy joints absorb stresses that occur when the concrete wall hardens. In a predominantly longitudinally extending concrete wall, for example, a running along a road Concrete sliding wall, are usually introduced at a distance of 3 meters on both sides of the concrete wall vertically extending dummy joints in the concrete wall. Likewise, a dummy joint is introduced into the wall crown, so that there is a circumferential dummy joint. The dummy joints usually have a width between 2 to 4 mm and a depth of 40 to 60 mm. In order to ensure a consistent quality of the dummy joints and to avoid endangering the operating personnel, the dummy joints can be automatically introduced by means of a device in the concrete wall.

Such a device is known from DE 103 23 364 B4 known. The device consists of a support frame, which can be placed on the wall crest of a concrete wall and moved by means of a chassis on the wall crown in the longitudinal direction. On the support frame, a guide means is fixed with a longitudinally displaceable arm, at the free end of a cutting device is arranged. The guide device is movable such that the cutting device can be guided along the concrete wall and thereby cuts a dummy joint in a predetermined depth. US 2,716,402 discloses the preamble of claim 1.

The invention has for its object to further develop the device so that a tax-technical simplification and handling results in order to achieve an improved sectional image of the dummy joint.

This object is achieved with the features of claim 1. In advantageous embodiments, the dependent claims relate.

To solve the problem, a spring arrangement is arranged between the support frame and the arm so that the pivotable articulation of the Arms the compensation of an angular offset or bumps in the concrete wall, allowing so that the cutting device always cuts a dummy joint at a specified depth. As a result of the spring arrangement, the arm in the unloaded state aligns itself independently with the support frame and, during the cutting process, causes the cutting device to be pressed against the concrete wall to be cut so that the cutting device always bears against the concrete wall with prestressing. As a result, the dummy joint can be introduced into the selected depth of cut at each point of the concrete wall, wherein it is not necessary to constantly track and align the cutting device manually.

The spring arrangement may comprise tension springs or torsion springs. The connection of a torsion spring can be done directly in the pivot bearing of the arm, the torsion spring can also form part of the storage. Both when using tension springs and torsion springs is also conceivable that several springs between arm and support frame are arranged to allow the largest possible spring force. The connection of the tension springs is preferably spaced from the pivot bearing, so that from the resulting lever results in an effective spring force

Preferably, the arm comprises a vertical guide and a pivot receptacle, wherein the pivot receptacle is pivotally mounted on the support frame and the vertical guide is secured longitudinally movable on the pivot receiver. In this case, it is particularly advantageous that the pivot axis and the longitudinal adjustment are decoupled from each other by the pivot receptacle, so that the pivot axis and the longitudinal adjustment can be designed for each play-free, resulting in a particularly accurate cross-sectional image. For receiving the vertical guide, the pivot receptacle is preferably provided with a roller arrangement, which absorb the vertical guide longitudinally displaceable. Furthermore, the roller assembly may be mounted on a plate, which in turn is fixed to the pivot receiver. The attachment of the plate to the swivel mount is preferably carried out by means of a screw, which may be provided for fixing slots that allow adjustment of the plate. This is particularly advantageous for adapting the arm to cutting devices of different dimensions.

Preferably, the spring arrangement is fixed to the pivot receiver. As a result, the spring arrangement cooperates directly with the pivot axis and, depending on the setting of the spring force, causes a restoring moment which holds the vertical guide in the unloaded state in a vertical position.

The swivel receptacle may have cantilevers for receiving the spring arrangement. By the boom, the connection is spaced from the vertical guide and the pivot axis, so that there is a better spring action and thus a higher restoring moment. This embodiment is particularly suitable when using coil springs. In an advantageous embodiment, the recording of the coil springs in the arms elongated holes. In this case, the coil spring can escape load under pressure in the slot in order to avoid buckling of the spring.

The connection of the spring arrangement to the support frame can be adjustable. As a result, the spring action of the spring arrangement can be adapted to the current requirements, without requiring the replacement of individual or several springs. Preferably, the support frame for the variable adjustment of the spring action of the spring assembly on a pivot lever on which the spring assembly is fixed. The pivot lever allows by simply twisting a change in the restoring moment caused by the spring arrangement. The setting can be done manually or by motor, wherein the adjustment of the spring force is preferably motorized by means of a servomotor. By the servomotor, it is possible to adjust the contact pressure of the cutting device to the concrete wall, even during the cutting process.

The vertical guide can be longitudinally displaceable by means of a traction mechanism drive. As a traction drive is in particular a chain, a toothed belt or a belt drive into consideration. These are particularly robust, especially with regard to the accumulated in large quantities during the cut dust. Furthermore, these drives have only a small game.

Preferably, the support frame has a horizontal guide, by means of which the arm is moved horizontally. Through the horizontal guide, the alignment of the arm takes place to the concrete wall. In this case, the arm is brought to the concrete wall such that the arm swings over the pivot axis and the arm rests by the restoring moment caused by the spring arrangement with bias on the concrete wall. A compensation of unevenness in the concrete wall or an angular offset can be compensated by the swinging of the arm. Preferably, the horizontal guide has a traction mechanism drive.

The cutting device can have at least one rotary cutter, which is driven by means of a traction mechanism drive. Such rotary cutters are, for example, synthetic resin cutting discs, Diamond cutting discs or similar rotating cutting devices. The rotary cutters can be guided along a surface of a concrete wall and bring a cut in a predetermined length and depth in the concrete wall. In order to produce a profiled dummy joint, the cutting device can be provided with a plurality of rotary cutting edges. By using a large diameter rotary blade and two small diameter rotary blades disposed on either side of the large rotary blade, a dummy joint having a preferred T profile in the concrete wall can be made. By means of the traction mechanism drive, the drive motor can be arranged at a distance from the rotary cutting edge. This relieves the area of the arm where the rotary blade is located and allows the motor to be positioned so that it is less subject to dust. As a traction drive is especially a chain, a toothed belt or a belt drive into consideration, with belt drives run very quiet and quiet and decouple the engine at least partially by torque fluctuations of the rotary blade by the damping by the belt material.

Particularly preferably, the position of the cutting device is predetermined by a sensing device which scans the surface of the concrete wall. This embodiment allows a high degree of automation of the cutting process, since the position of the cutting device is predetermined by the sensing device. In this case, the sensing device directly affect the pivoting movement of the arm or be connected to an adjusting device, such as a servomotor. The sensing device is particularly preferably arranged in the region of the cutting device and acts as a stop. In this embodiment, the cutting device can penetrate into the concrete wall until the scanning device on the Concrete wall reaches the plant. If the scanner on the concrete wall to the system, the arm of the guide device is pivoted, so that the cutting depth is limited.

The sensing device may be formed as a cam follower. The design of a scanning roller is particularly advantageous in the execution of dummy joints, since the cutting device is guided to introduce the dummy joints along the concrete wall and over the entire height on both sides of the concrete wall introduces a cut in a predetermined width and depth in the concrete wall. During the cutting process, the scanning roller can roll on the surface of the concrete wall and continuously specify and limit the cutting depth. The cutting depth of the cutting device is predetermined by the distance difference between the cutting device and sensing device with respect to the concrete wall. In this embodiment, motor control elements can be omitted since the cam roller allows a direct pivoting of the arm as soon as the cam follower touches the surface of the concrete wall. In this case, the spring arrangement and the cam followers cooperate in such a way that the pressing of the arm against the concrete wall takes place by spring arrangement and the cam follower limits this contact pressure.

The axis of rotation of the rotary cutter may coincide with the axis of rotation of the cam follower. This arrangement is particularly easy to manufacture and ensures a consistent depth of cut over the entire circumference of the rotary blade.

The axis of rotation of the cam follower can be adjustable. This is preferably done by replacing the cam follower against a cam follower of larger or smaller diameter. In this embodiment, it is advantageous that the cutting depth is variable and easily adaptable. Preferably, the device is designed as a notch cutting device for cutting a dummy joint in a concrete sliding wall of a road. The device is particularly robust and can be operated with a high degree of automation and thus enables a high manufacturing speed with high production accuracy.

• Fig. 1 eine Schneideinrichtung in der Seitenansicht;
• Fig. 2 die Schneideinrichtung in der Vorderansicht;
• Fig. 3 im Detail die Anbindung des Arms an das Traggestell;
• Fig. 4 die Anbindung des Arms an das Traggestell in der Hinteransicht.

Some embodiments of the device according to the invention are explained below with reference to the figures. These show, in each case schematically:

• Fig. 1 a cutting device in side view;
• Fig. 2 the cutting device in front view;
• Fig. 3 in detail, the connection of the arm to the support frame;
• Fig. 4 the connection of the arm to the support frame in the rear view.

FIG. 1 schematically shows in side view a device 1 for cutting a dummy joint 2 in a concrete wall 3, here a concrete sliding wall, which runs along a road. The concrete sliding wall is manufactured using in-situ concrete and arranged along a road as its boundary. The device 1 is designed so that it can be positioned on the wall crest 31 of the concrete wall 3 and moved on this.

The device 1 comprises a support frame 4 on which a cutting device 5 and a guide device 6 are fixed. By means of the guide device 6, the cutting device 5 can be guided along the dummy joint 2 to be cut. The guide device 6 has a longitudinally adjustable arm 7 which is pivotally connected to the support frame 4. For this purpose, the arm 7 is connected via a pivot axis 17 rotatably connected to the support frame 4. The arm 7 comprises a vertical guide 9 and a Swivel receptacle 10, wherein the pivot receptacle 10 is pivotally mounted on the support frame 4 and the arm 7 is mounted in the vertical guide 9 longitudinally displaceable on the pivot receptacle 10. Between vertical guide 9 and support frame 4, a spring assembly 8 is arranged, wherein the spring assembly 8 is fixed on one side to the vertical guide 9.

The cutting device 5 has a rotary blade 15, which is driven by means of a traction mechanism drive 13. The drive motor 29 of the rotary blade 15 is spaced from the rotary blade 15 attached to the arm 7.

The depth position of the cutting device 5 is predetermined by a sensing device 30 which scans the surface of the concrete wall 3. The sensing device 30 is formed as a cam follower and is assigned to the cutting device 5 designed as a rotary blade 15 with cutting discs. In this case, the axis of rotation of the rotary blade 15 coincides with the rotational axis of the cam follower. To regulate the depth of cut, the axis of rotation of the cam follower can be adjustable. For this purpose, a cam follower of different diameters can be mounted on the axle. The cutting depth of the cutting device 5 is predetermined by the distance difference between the cutting device 5 and the sensing device 30 with respect to the concrete wall 3.

For the process, the support frame 4 has a chassis 32 formed by a chain drive, through which the device 1 along the wall crown 31 can be moved, so that the device 1 can be moved to introduce a further dummy joint 2. The chassis 32 also has rollers which abut the side of the concrete wall 3 and thereby the device 1 during the process lead the wall in the middle and at the same time support laterally during the cutting process.

But it is also conceivable that the chassis 32 is designed so that it can be positioned next to the concrete wall 3. In this embodiment, a method of the device 1 takes place next to the concrete wall. 3

The introduced into the concrete wall 3 dummy joint 2 has a T-profile and is closed after the cutting process with a permanently elastic sealant, such as a profile of elastomeric material or an elastomeric sealant.

FIG. 2 shows the device 1 for cutting a dummy joint 2 in a concrete wall 3 in the front view. The guide device 6 has a longitudinally adjustable arm 7 which is pivotally connected to the support frame 4. For this purpose, the arm 7 is connected via a vertical guide 9 and the pivot axis 17 rotatably connected to the support frame 4. The arm 7 comprises a vertical guide 9 and a plate-shaped pivot receptacle 10, wherein the pivot receptacle 10 is pivotally attached to the support frame 4 and the arm 7 is longitudinally displaceable on the pivot receptacle 10 and the vertical guide 9 is attached.

Between arm 7 and support frame 4, a spring assembly 8 is arranged, wherein the spring assembly 8 is fixed on one side to the pivot receptacle 10. The pivot receptacle 10 has for receiving the spring assembly 8 boom 11, which protrude laterally from the pivot receptacle 10. In the arms 11 long holes 18 are provided, in which the spring assembly 8 is slidably received within limits. As a result, the spring arrangement 8 act in one direction on the pivot receptacle 10, while the spring assembly 8 is relieved in the other direction. The spring assembly 8 may comprise a plurality of individual springs, which may be connected in series or in parallel. In this embodiment, the spring assembly 8 six individual coil springs, which are each provided with hooks at the ends. The coil springs engage on one side with the hooks in the slots 18, which are introduced into the region of the free ends in the boom 11. The coil springs are connected so that upon pivoting of the arm 7 each three springs are subjected to train, while three springs are relieved. The spring assembly 8 is arranged between arm 7 and support frame 4, that the arm 7 is pivotable against the force of the spring assembly 8. As a result, the spring arrangement counteracts the deflection of the arm 7, which is caused by a pivoting of the arm 7 during the cutting process due to the profiling of the concrete wall 3 or other bumps and the cutter is always biased against the concrete wall 3, whereby an electronic reading of the Concrete surface flatness is eliminated.

The connection of the spring assembly 8 to the support frame 4 is adjustable. For this purpose, the support frame 4 for the variable adjustment of the spring action of the spring assembly 8 on a pivot lever 12 to which the spring assembly 8 is fixed. For this purpose, the pivot lever 12 in the region of the free end for receiving the hooks of the coil springs on a bore. The pivot lever 12 is connected to a servomotor 19 and thereby adjustable by motor, whereby the spring force of the spring assembly 8 is adjustable during operation. By means of the pivot lever 13, the spring force is preferably adjusted so that the cutting device 5 is pressed with a force of 10 to 30 Newton, preferably 20 Newton to the surface of the concrete wall 3.

The arm 7 is vertically movable by means of a traction mechanism, here a chain drive 20. For this purpose, a chain drive 20 is provided, wherein the chain 21 of the chain drive 20 is fixedly connected to the pivot receptacle 10 and is deflected at the two ends of the vertical guide 9 via gears 22. One of the two gears 22 'is connected to an electric motor 23, while the other gear 22 "is arranged on the other side of the arm 7 and forms a deflection roller Vertical guide 9 either vertically upwards or downwards depending on the direction of rotation of the toothed wheel 22. The guidance of the vertical guide 9 on the swivel receptacle 10 takes place via a roller arrangement 24. This is fastened to the swivel receptacle 10 via a plate 25, the attachment taking place via elongated holes 18 so that the plate 25 is displaceable to adapt the device 1 to cutting devices 5 of different diameters.

The support frame 4 has a horizontal guide 26, by means of which the arm 7 is movable horizontally transversely to the longitudinal extent of the concrete wall 3. On the horizontal guide 26 of the arm 7 including vertical guide 9 and pivot receptacle 10, the pivot lever 12 with actuator 19 and the spring assembly 8 is mounted horizontally movable on the support frame 4. The entirety of horizontal guide 26 and arm 7 including the vertical guide 9 with pivot receptacle 10 forms the guide means 6. The horizontal guide 26 has a transverse arm 27, which is associated with a horizontally movable carriage 28. The drive of the carriage 28 via a traction mechanism 13, here a cable drive. On the carriage 28 of the arm 7 and the pivot lever 12 are fixed with actuator 19.

The rotary cutter 15 of the cutter 5 is driven by a drive motor 29 fixed to the arm 7 at a distance from the rotary cutter 15.

The position of the cutting device 5 is predetermined by a sensing device 30, which scans the surface of the concrete wall 3. The sensing device 30 is formed as a cam follower and is assigned to the cutting device 5 designed as a rotary blade 15 with cutting discs.

The cutting device 5 has three rotary cutting edges 15, wherein the three rotary cutting edges 15 are each formed from a diamond cutting disc. The three rotary cutting edges 15 are arranged such that a rotary cutting edge 15 of large diameter is arranged centrally and a rotary cutting edge 15 of small diameter is arranged on both sides of this rotary cutting edge 15. This results in a dummy joint with a T-profile when cutting.

FIG. 3 shows in detail and detail the connection of the in the FIGS. 1 and 2 described pivot recording 10. It shows FIG. 3 the swivel mount in the front view. FIG. 4 shows the vertical guide 9 with swivel mount 10 and spring assembly 8 in the rear view.

The fixed between arm 7 and support frame 4 spring assembly 8 is fixed on one side to the pivot receptacle 10, which has for receiving the spring assembly 8 boom 11, which protrude laterally from the pivot receptacle 10. In the arms 11, the slots 18 are provided. The spring assembly 8 has six individual springs, which are arranged so that when pivoting the Arms 7 three springs are claimed to train, while three springs are relieved.

For variable adjustment of the spring action of the spring assembly 8, the support frame 4 has a pivot lever 12 on which the spring assembly 8 is fixed. The pivot lever 12 is connected to a servomotor 19 and thereby adjustable by motor, whereby the spring force of the spring assembly 8 is adjustable during operation.

The roller assembly 24 for guiding the vertical guide 9 on the pivot receiver 10 is mounted on a plate 25. The plate 25 is fastened to the swivel mount 10, the attachment taking place via elongated holes 18, so that the plate 25 is displaceable relative to the swivel mount 10 for adapting the device 1 to cutting devices 5 of different diameters.

LIST OF REFERENCE NUMBERS

1

contraption

2

dummy joint

3

concrete wall

4

supporting frame

5

cutter

6

guide means

7

poor

8th

spring assembly

9

vertical guide

10

swivel mount

11

boom

12

pivoting lever

13

traction drive

14

horizontal guide

15

rotary cutting

16

concrete wall

17

swivel axis

18

Long hole

19

Actuator of the rotary actuator

20

chain drive

21

Chain

22

Gear of the vertical guide

22 '

Gear as drive wheel

22 "

Gear as diverting wheel

23

electric motor

24

Roller assembly, each of the horizontal and vertical guide

25

plate

26

horizontal guide

27

cross arm

28

carriage

29

Drive motor of the cutting device

30

sensing device

31

coping

32

landing gear

Claims (11)

1. Device (1) for cutting a pseudo-joint (2) into a concrete wall (3), comprising a supporting frame (4), a cutting unit (5), and a guide unit (6) which is fixed to the supporting frame (4) and by means of which the cutting unit (5) can be guided along the pseudo-joint (2) to be cut, wherein the guide unit (6) has a longitudinally adjustable arm (7) and wherein the arm (7) is pivotably attached to the supporting frame (4), wherein a spring arrangement (8) is arranged between the supporting frame (4) and the arm (7), characterized in that the spring arrangement (8) is designed in such a way that, in the unloaded state, the arm (7) automatically aligns with the supporting frame (4) and, during the cutting operation, leads to the cutting unit (5) being pressed against the concrete wall (3) to be cut, with the result that the cutting unit (5) always bears with prestress against the concrete wall (3).
2. Device according to Claim 1, characterized in that the arm (7) comprises a vertical guide (9) and a pivoting receptacle (10), wherein the pivoting receptacle (10) is pivotably fastened on the supporting frame (4) and the vertical guide (9) is fastened in a longitudinally movable manner on the pivoting receptacle (10).
3. Device according to Claim 2, characterized in that the spring arrangement (8) is fixed on the pivoting receptacle (10).
4. Device according to Claim 3, characterized in that the pivoting receptacle (10) has cantilevers (11) for receiving the spring arrangement (8).
5. Device according to one of Claims 1 to 4, characterized in that the spring arrangement (8) is attached to the supporting frame (4) in an adjustable manner.
6. Device according to Claim 5, characterized in that, in order to variably set the spring action of the spring arrangement (8), the supporting frame (4) has a pivoting lever (12) on which the spring arrangement (8) is fixed.
7. Device according to Claim 6, characterized in that the pivoting lever (12) is motor-adjustable.
8. Device according to one of Claims 1 to 7, characterized in that the vertical guide (9) is longitudinally displaceable by means of a flexible drive mechanism (20).
9. Device according to Claim 7 or 8, characterized in that the supporting frame (4) has a horizontal guide (14) by means of which the arm (7) is horizontally moveable.
10. Device according to one of Claims 7 to 9, characterized in that the cutting unit (5) has at least one rotary cutting edge (15) which is driven by means of a flexible drive (13).
11. Device according to one of Claims 1 to 10, characterized in that the device (1) is designed as a notching device for cutting a pseudo-joint (2) into a concrete barrier wall (16) of a road.

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