JP3362960B2 - Jib crane support device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a jib crane which is installed and used in a place where there is a difference in elevation on a mounting surface. The present invention relates to a support device for a jib crane that includes support legs that can be rearranged.

[0002]

2. Description of the Related Art Conventionally, when constructing a steel tower for constructing a power transmission line in a place where the topography is not flat, for example, in a mountainous area or a hilly area, the foundation of the steel tower is constructed and the steel tower building materials are carried up. The jib crane is used for. In such mountainous areas and hilly areas, the jib crane has to be installed on the slope, so that it is necessary to excavate the sloped ground into a large plane to provide a support for the crane. However, making a large cut in such a sloping ground not only destroys the soil generated there, but also requires restoration of the cut open ground after the end of the work, which requires a great deal of labor and cost for the work, as well as environmental damage. Therefore, there has been proposed a crane designed so that the excavation range of the ground can be reduced and the ground can be installed even on a recent sloping land. As an example thereof, the structure disclosed in Japanese Utility Model Publication No. Sho 63-30792, or as shown in FIG. 8, the attachment base 53 of the outrigger 52 to the base frame 50 is vertically shifted to be fixed, whereby the tip of the outrigger 52 is fixed. There is known a configuration in which the portion 54 can be vertically displaced and the screw jack 55 attached to the tip portion 54 of the outriggers 52 can be vertically adjusted to determine the support height on the inclined surface.

[0003]

In the prior art as described above, in the former configuration (Japanese Utility Model Publication No. 63-30792), the base end of the outrigger is pin-connected to the support leg mount at the lower side. The upper side of the lever is pulled or pushed toward the turning center of the crane by the turnbuckle,
By raising and lowering the tip portion of the outrigger, the height of the support base attached to the tip portion is set. Since the setting of the support position of the outrigger is performed by the turnbuckle, it is relatively easy for a small height difference. However, on the other hand, a gap that expands upward is formed above the connecting pin so that it can be displaced vertically at the connecting end of the base end of the outrigger and the support leg mount of the crane, and it is supported when the tip of the outrigger goes down. This turnbuckle must be sturdy, as the reaction force will be large and will act on the turnbuckle. Also, if the inclination angle of the installation location changes, the distance from the turning center of the crane to the support base at the tip of the outrigger changes, so the stability as a crane changes depending on the installation state, which is not preferable. Therefore, it is difficult to apply to cranes with large working capacity.

Further, in the configuration shown in the latter (see FIG. 8) described above, a plurality of pin connecting holes at the base end of the outriggers 52 are provided in the mounting bracket 51 radially provided on the peripheral surface of the crane supporting base frame 50. By changing the attachment position of the connecting pin in those pin connecting holes.
The tip position of each of the outriggers 52 is changed up and down, and the outriggers 52 are supported and adjusted by the screw jacks 55 attached to the tips thereof. However, in this method, the mounting bracket 51 provided on the peripheral surface of the base frame 50 supporting the crane is provided with a large number of pin connecting holes for connecting the base end portions of the respective outriggers 52 to obtain an angle corresponding to the inclined ground. If not, the screw jack 55 must be projected excessively long in the arrangement of the outriggers 52 corresponding to the inclination angle, or the inclined ground must be scraped off in the installation position so that the installation can be performed. Moreover, also in this crane, if the inclination angle of the installation position becomes large, the distance from the turning center to the support position of the outrigger becomes short, similar to the above-mentioned crane, so there is a problem in securing stability during hanging work, It has a problem in that it leads to environmental destruction.

The present invention solves these problems and
Each part of the supporting device can be made to be easily transported to a high place and can be easily weighed, and by selecting a connecting combination of those parts, the distance from the turning center to the supporting position of the supporting leg tip is not changed,
An object of the present invention is to provide a support device for a jib crane, which can cope with a difference in height of the support legs with respect to the inclined ground and can support the crane main body while maintaining a constant stability during suspension work.

[0006]

A supporting device for a jib crane according to the present invention , which is constructed to achieve such an object.
, In the jib crane of the low floor type, a plurality of support legs disposed radially from the support base that is equipped with a turning mechanism for supporting the crane body, pivot their respective base end portions and the support base A parallelogram base leg member that can be attached and detached at a required angle with respect to the center line of rotation on an elevation passing through the line, and
It is connected so that it can be turned up and down with respect to the base leg member of
That it at the tip Buashi member, the coupled in parallel base end portion of the base leg member to said pivot axis, the tip vertically to the mounting height repositionable mounting the jack on each such support leg And the connecting direction of both leg members of the support leg is changed up and down.
Regardless of the conversion method, the jar installed from the turning center line
It is characterized in that the distance to the axis of the kick is the same .

Further, in the above invention, each support leg connected to the support base has a base leg member and a tip leg member.
Connect the connecting part with and the mounting part with the jack to the support base.
The structure that is detachably connected in parallel with the turning center line of
Preferably it is Further, it is desirable that the connecting means in each connecting portion has a pin connecting structure.

[0008]

According to the supporting device for a jib crane of the present invention thus constructed, when the jib crane is used by being installed on a sloping ground in a mountain, for example, the supporting device for supporting the crane main body at the crane installation position is supported. Support legs that project radially (four directions) from the base stand are
On the elevation passing through the center line of rotation,
Depending on the angle, the supporting legs can be connected and combined by selectively changing the vertical direction at the connecting portion between the base end and the support base, and the mounting height of the jack attached to the tip of each support leg By installing the position corresponding to the sloping ground, it can be installed with a certain degree of stability without changing the distance from the turning center of the crane to the support position of each support leg tip with respect to the inclination in a wide range. be able to.

In particular, each support leg is constructed by connecting a plurality of members, and its base end is connected to the support base of the crane main body in parallel with the turning center line of the crane, and the support leg is also provided. The crane is pivoted by connecting the intermediate connecting portions of the constituent members in parallel with the base end portion and changing the orientation of each supporting leg constituent member to the supporting base to change the direction of the supporting leg to any one of the upper and lower directions. The distance from the center to the supporting position of the tip of the supporting leg is kept constant, and it is possible to cope with the inclination of the installation place. That is, since the support leg can select the height of the tip of the support leg on the mountain side and the valley side by changing the vertical direction of the base leg member and the member on the tip side, it can be greatly lowered with respect to the reference support base, Alternatively, it can be increased to a large value or moderately increased, and the support distance does not change under any condition. With respect to a small height difference, the jacks at the respective tips can be vertically displaced, and the jacks can be adjusted to cope with a sloped ground and the installation level can be set correctly. Therefore, the stability of the crane can be kept constant regardless of the height of the installation surface.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a supporting device for a jib crane according to the present invention will be described with reference to the drawings.

FIG. 1 shows a specific example of a jib crane provided with a supporting device for a jib crane according to the present invention.
The jib crane 1 shown in this figure is a low-floor type jib crane, in which a swivel plate 5 on which a jib support frame 3 and a jib 4 constituting a crane body 2 are mounted is a swivel mechanism 6.
A projecting portion 5b projecting to the side opposite to the projecting direction of the jib 4 with respect to the main body portion 5a connected to the main body portion 5a is provided so as to be inclined upward. The projecting portion 5b of the swivel plate 5 is detachably connected and fixed to the main body portion 5a at the base end, the hoist 7a and the undulating winch 7b are mounted on the upper surface, and the balance weight 8 is attached to the rear end. Therefore, it is configured so as not to come into contact with the support legs 23 and the like when turning on the inclined surface. Further, in order to support such a crane main body 2, the support device 20 is configured so that the posture of each support leg 23 can be changed to cope with a sloped ground. In the figure, reference numeral 11 is a hoisting rope, 12 is an undulating rope, and 13 is a hook block.

The support device 20 includes a support base 21 having a well-known swivel mechanism 6 mounted on the upper surface of the crane main body 2 to which the swivel plate 5 is pivotably supported and connected, and a radial shape around the support base 21. Multiple attached (4 in this example)
The present invention is composed of a combination type support leg 23 of the present invention, and each of the constituent members can be divided into small weights (FIG. 2).
And FIG. 3).

The support base 21 has a cylindrical shape and is equally divided into peripheral surfaces, and mounting brackets 22 for supporting legs are respectively provided at four positions in a protruding manner.
The connection base end portions 23a of the support legs 23 are detachably connected to the respective mounting brackets 22 at two upper and lower positions by pins. The support base 21 has a structure capable of reducing the weight within an allowable range so that it can be easily transported.

The support legs 23 are all of the same size and have a base leg member.
The two members, 24 and the tip leg member 25, are directly connected to each other with a required length dimension and at a required angle with respect to the turning center line a on the vertical plane passing through the turning center line a of the crane. In this way, the pin is connected at an intermediate position which is appropriately distant from the connecting base end portion 23a. The base leg member 24 has a predetermined length so that the connection base end portion 23a of the support base 21 to the mounting bracket 22 can be connected in a state parallel to the turning center line a, and the base leg member 24 is
And the connecting end portion 23b of the tip leg member 25 are parallel to each other, and the base leg member 24 has a box structure with an outer shape approximate to a parallelogram, and both connecting end portions 23a.
, 23b are provided with connecting pin holes 26, 26 laterally, respectively.

Further, one end of the tip leg member 25 is a connecting end portion 24a for connecting to the base leg member 24, and the connecting pin hole 27,
27 is provided sideways, and a connecting bracket 28 to which a jack is attached is provided at the other end, and the jack 30 is attached by the connecting bracket 28 while changing its height in the vertical direction. The jack 30 is of a screw type and has a cylindrical main body 31 with a mounting hole 32 that can be engaged with and fastened to a mounting hole 28 ′ of a connecting bracket 28 at a tip portion of the tip leg member 25 at a predetermined pitch. There are multiple
The bolts 35 are selectively fastened to set the lifting operation range of the jack screw 33. Symbols in the figure
29 is a connecting pin.

The support device 20 of the jib crane constructed as described above is, for example, when the installation location is an inclined ground, for example, in a mountainous area where the inclination angle is steep, depending on the topography of the installation site where the jib crane 1 is installed. , The supporting legs 23A and 23B respectively located on the mountain side (upper side) and the valley side (lower side) of the installation slope ground A are respectively the base leg member 24 and the tip leg of the one located on the mountain side as shown in FIG. The support leg 23A is aligned with the member 25 in a straight line in a state where the support leg 23A is flipped up, and the connection end 23a of the support base 21 to the mounting bracket 22 is connected by a connection pin 29. The support leg 23B located on the valley side is aligned in a straight line so that the base leg member 24 and the tip leg member 25 project downward, and the connecting end portion 23a of the support base 21 to the mounting bracket 22 is pin-connected. The crane main body 2 is assembled on the support base 21 in a predetermined order. In this way, the support legs 23A located on the mountain side
And the supporting legs 23B located on the valley side are mounted in opposite directions, the respective base ends of the supporting legs are connected to the mounting bracket 22 of the supporting base 21 in parallel with the turning center line a. Therefore, the distance L from the turning center of the crane to the supporting position remains unchanged.

Incidentally, in order to mount the revolving base 5 while keeping it horizontal in correspondence with the supporting reaction force of each supporting leg 23A, 23B, the jack screw 33 of each jack 30 can be operated to finely adjust the height. In this state, support leg 23A and support leg
The height difference of the tip of 23B becomes maximum. As described above, the supporting legs 23A and 23B are arranged in such a manner that the protruding portions 5b of the revolving base 5 are inclined with their tips facing upward as described above even when the height difference between the mountain side and the valley side is large. Therefore, even if the crane main body 2 is rotated to perform the work, the crane main body 2 can be operated without any trouble.

Next, when installing on a sloping ground where the height difference is relatively small, for example, as shown in FIG. 5, the mountain side support leg 23A has its base leg member 24 with its base leg member 24 inclined upward as described above. It is connected to the mounting bracket 22 of the base 21, and the tip end member 25 is turned upside down so that the tip end faces downward. The connection end portion 24a is aligned with the connection end portion 23b of the base leg member 24 and is connected by the connection pin 29. Done with jack 30
The installation state of is changed according to the relationship with the sloping ground A ', so that it can be supported. Note that the support legs 23B on the valley side are connected to the mounting bracket 22 of the support base 21 in the same manner as described above with the tips aligned downward. By doing so, it becomes possible to easily install on a sloping ground where the difference in elevation of the supporting position is small. Each support leg 23
Fine adjustment of the support status of A and 23B can be done by using each jack as described above.
The jack screw 33 of 30 may be operated. Even with such a combination of the supporting leg constituent members, the distance L from the crane turning center to the supporting position does not change, as described above.

If the installation location is flat or flat, use a combination of the base leg member 24 and the tip leg member 25 of each support leg 23 as shown in FIG. 6 (a). The base end is connected to the connection bracket (22) of the support base (31) with the tip oriented downward. In this way, the crane body 2 is horizontally held and supported in a high supporting state. And as another way of assembling, FIG. 6 (b)
As shown by, each support leg 23 is connected to the mounting bracket 22 of the support base 21 with its base leg member 24 facing upward, and the tip leg member 25 is connected to each base leg member 24. Can be supported horizontally by lowering the supporting position of the swivel plate 5 by connecting the ends in a downward posture. Even if the support legs 23 are combined in any of these postures, the distance L from the crane turning center to the support position of each support leg is constant.

In each of the above-described support modes of the crane main body 2 by the support device 20, when the support legs 23 are turned upside down and assembled, the jacks 30 attached to the tips of the support legs 23 are the support legs 23. Side connecting bracket
Since the mounting hole 32 is mounted by changing the position of the mounting hole 32 to an arbitrary vertical height, the mounting height is selected according to the positional relationship between the tip of the supporting leg 23 and the ground. As a result, the jack screw 33 can be supported and adjusted without protruding excessively. Further, as a connecting structure in the connecting portion of the base leg member 24 and the tip leg member 25 in the support leg 23, if configured so that the end faces of both members can be butted against each other by pin connection, the axial direction acting on these support legs can be improved. Since the compression force can be directly received by the member, the acting force on the connecting pin 29 can be reduced. In the case of such a structure, it is possible to facilitate the fitting of the pin into the connecting hole by interposing a buffer at the joint end.

As described above, in the crane supporting apparatus according to the present invention, the combination of connecting the constituent members of each supporting leg to the supporting base 21 may be changed according to the situation of the installation site. Since the distance L from the turning center of the crane to the supporting position (the supporting position by the jack 30) can be kept constant, the stability of the crane can be kept constant, and the crane can be safely installed even on a sloping ground. Lifting work can be performed.

Further, when the supporting device 20 of the present invention is installed in a stable and flat place, as shown in FIG. 7, for example, a predetermined base C is provided in the installation place, and the support base is mounted on the base C. The 21 can also be installed and used directly.
Further, the tip leg member 24 of the support leg 23 in the present embodiment corresponds to the tip side member of the present invention.

[0023]

As described above, according to the present invention, by selecting the combination of the support legs according to the terrain of the place where the crane is installed, and by adding the adjustment of the height of the support jack, a special separate device is provided. Because it can be assembled and installed with stability even on sloping land without using it, it can be installed on terrain with bad installation conditions such as mountainous areas without carrying excessive equipment, and can be disassembled in small quantities Therefore, it can be said that it is a useful device that can be easily carried and convenient.

[Brief description of drawings]

FIG. 1 is a front view of a specific example of a jib crane including a support device for a jib crane according to the present invention.

FIG. 2 is a plan view taken along line II-II of FIG.

FIG. 3 is an enlarged front view of a main part of the supporting device.

FIG. 4 is a view showing a usage mode of a supporting device for a jib crane according to the present invention.

FIG. 5 is a view showing a mode of use of the support device for a jib crane according to the present invention.

FIG. 6 is a view showing a usage mode of a support device for a jib crane according to the present invention, (a) showing a horizontal support mode in a waist height state, and (b) showing a support height state in a lowered state. The horizontal support mode is shown.

FIG. 7 is a view showing another usage mode of the support device for the jib crane according to the present invention.

FIG. 8 is a diagram showing an example of a conventional jib crane that can be used on a sloping ground.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Jib crane 2 Crane main body 5 Swivel disc 5b Swivel disc protrusion 6 Swing mechanism 20 Crane main body support device 21 Support base 22 Mounting bracket 23 Support leg 23A Mountain side support leg 23B Valley side support leg 24 Base leg member 25 Tip Leg member 28 Connection bracket 30 Jack A, A'Sloping ground L Distance from the crane turning center to the support position of the support leg

Claims (2)

(57) [Claims] 1. A low-floor type jib crane, a plurality of support legs disposed radially from the support base that is equipped with a turning mechanism for supporting the crane body, the support base to their respective proximal end A parallelogram base leg that can be attached and detached at a required angle with respect to the turning centerline on an elevation passing through the turning centerline.
Member and this base leg member can be turned up and down
Becomes at the tip Buashi member connected to said coupled in parallel <br/> proximal end of the base leg member to said pivot axis, mounted jack the tip of each such support leg in the vertical direction Mounted so that the height position can be changed , and connecting both leg members of the support leg
Even if the direction is changed up or down, it will be installed from the turning center line
So that the distance to the axis of the jack is the same.
Supporting apparatus jib crane, characterized by being. 2. Each support leg connected to the support base comprises:
The connection between the base leg member and the tip leg member and the jack
The mounting part with g is parallel to the center line of rotation of the support base.
The support device for the jib crane according to claim 1, wherein the support device is detachably connected in a state .