JP2007112526A - Self-traveling type small sized crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-traveling type small sized crane capable of being applied to a construction field in which a passage width is narrow and an installation space of a crane cannot be widely obtained and accurately, efficiently and safely performing cargo work even in a small work space. <P>SOLUTION: In order to solve the problem, the self-traveling type small sized crane 1 of the present invention is provided with a small sized transportation vehicle 3 applicable to the construction field in which the passage width is narrow and the installation space of the crane cannot be widely obtained; a main strut 5 mounted on the transportation vehicle 3 and upwardly, vertically and standingly provided; a sub-strut 7 provided at a position left from the main strut 5 in a width direction X by a predetermined inter-strut distance S; a horizontal support frame 9 laid between the sub-strut 7 and the main strut 5 and connecting both struts; and a baggage hanging device 11 hung/retained relative to the horizontal support frame 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a self-propelled small crane that can be applied to a construction site where the passage width is narrow and the crane installation space cannot be made wide, such as a cemetery, a cemetery, etc. The present invention relates to a small self-propelled crane that can be executed in a compact, efficient and safe manner.

Various types of cranes with different sizes and structures exist and are used depending on the size, load, shape, and type of the object to be suspended, or the situation of the construction site where the cargo handling work is performed.
For example, in a harbor or the like, a gate-type large crane called a jib crane or the like installed in a fixed state is used. Also, at various construction and civil engineering construction sites, a crawler-type large transport vehicle is equipped with a cockpit, and a self-propelled large crane is used in which an operator gets into the cockpit and operates a boom that can be extended, tilted, and swiveled. Has been.
Also, in factories, warehouses, etc., overhead cranes are used that have a traveling body that travels on a guide rail spanned over the ceiling by remote control. In addition, indoor and outdoor construction sites where the passage width is narrow and the crane installation space is not large, a self-propelled small crane equipped with a telescopic suspension boom is used on a small transport vehicle.

Of these, the conventional self-propelled small crane employs a structure in which an arm-like suspension boom is mounted on a light-weight transport vehicle. The work was carried out with the support legs called outriggers of the books protruding sideways.
However, in cemeteries, cemeteries, and other construction sites where the width of the passage is narrow and the crane installation space is not large, the outriggers that protrude to the side protrude to the graveyards of other people. In addition, it has been pointed out that the suspension boom is used for cargo handling work in a cemetery where many tombstones stand, and there is a possibility that the suspension boom or the tombstones lifted by the suspension boom will hit an existing tombstone and be damaged. Moreover, in order to accurately move the suspended load by the suspension boom, a high level of operation technology is required.

  The present invention has been made in light of the above-described background art and problems of the background art, and can be applied to a construction site where a passage width is narrow and a crane installation space cannot be widened. It is an object of the present invention to solve the problem of providing a self-propelled small crane having a novel structure that can efficiently and safely carry out cargo handling work.

  In order to solve the above-mentioned problem, the invention described in claim 1 is directed to a transport vehicle, a main column mounted on the transport vehicle and vertically erected upward, and in a width direction with respect to the main column. A sub strut provided at a position separated by a predetermined distance; a horizontal support frame that is spanned between the sub strut and the main strut and connects the two; and a lifting device that is suspended from the horizontal support frame. It is a self-propelled small crane characterized by having.

  The invention described in claim 2 is the self-propelled small crane described in claim 1, wherein the main column is fixed to a base frame installed on the transport vehicle, and the fixed pole A self-propelled small crane that includes a movable pole that is telescopically fitted from above and that moves up and down under the drive of the lifting device to extend and contract the main column.

  The invention described in claim 3 is the self-propelled small crane described in claim 1 or 2, wherein the sub-post is attached to the horizontal support frame in a suspended state, and the upper pole is nested with respect to the upper pole. A self-propelled small crane having a lower pole for extending and contracting a sub-column by changing a relative position with respect to the upper pole by operating the winding device while being externally fitted from below .

  According to a fourth aspect of the present invention, in the self-propelled small crane described in the third aspect, the lower pole has a traveling means for traveling in the passage and a fixing means for fixing the sub-post at the installation location. It is a self-propelled small crane characterized by being provided.

  The invention described in claim 5 is the self-propelled small crane described in any one of claims 1 to 4, wherein the sub-support and the horizontal support frame are separated from the main support during storage and are disassembled, contracted or folded. It is a self-propelled small crane which can be accommodated on a transport vehicle.

  The invention described in claim 6 is the self-propelled small crane described in any one of claims 1 to 5, wherein a suspended position of the suspended load device is horizontally supported between the horizontal support frame and the suspended load device. The self-propelled small crane is provided with plane moving means that can be moved in the left-right direction along the longitudinal direction of the frame and in the front-rear direction orthogonal thereto.

  According to a seventh aspect of the present invention, in the self-propelled small crane described in the sixth aspect, the plane moving means is provided with a left and right moving means and a suspended position provided above which can move the suspended load position in the left-right direction. The front and rear moving means provided below can be combined, and the right and left moving means includes the horizontal support frame functioning as a guide rail, and rolls on the horizontal support frame. A plurality of guide rollers, an upper support bracket that rotatably supports the guide rollers, one of the guide rollers fixed to one end, a drive shaft that rotates integrally with the guide rollers, and other drive shafts A timing pulley that is fixed to the end and rotates integrally with the drive shaft, and is wound around the timing pulley and hangs downward. It is self-propelled small crane, characterized in that a endless belt-like timing belt functions as an operation unit to be.

  The invention described in claim 8 is the self-propelled small crane described in claim 7, wherein the front-rear moving means is attached to a lower end portion of the upper support bracket and extends in the front-rear direction, and one of the guide rails. A plurality of guide rollers that come into contact with the part and roll, a lower support bracket that includes a suspension member that rotatably supports these guide rollers and that also supports the suspension device, and one of the guide rollers. A drive shaft fixed to one end and rotating integrally with the guide roller, a timing pulley fixed to the other end of the drive shaft and rotating integrally with the drive shaft, and wound around the timing pulley and suspended downward A self-propelled small crane comprising an endless belt-like timing belt functioning as an operating means.

According to the self-propelled small crane of the present invention, by using a small transport vehicle, the passage width is narrow, and even a construction site where the installation space of the crane cannot be widened can be moved with a small turn and installed in a small space. In addition, by adopting a crane with a portal structure consisting of a main column, a sub column and a horizontal support frame, the work space can be reduced, and the cargo handling operation can be performed accurately and safely.
In addition, the main column and the sub column are extendable, and the height of the horizontal support frame can be appropriately adjusted according to the size of the suspended load and the situation at the construction site. In addition, the adoption of a crane with a portal structure eliminates the need for an outrigger that protrudes to the side, making it possible to secure the posture of the transport vehicle with simple fixing means.

By adopting sub-posts and horizontal support frames with disassembled, shrunk or folded structure, the external dimensions of the self-propelled small crane are reduced, the passage and direction change are easy, and the storage space is small. .
By adopting the plane moving means, the suspended load can be moved with high accuracy, the suspended load installation accuracy is improved, and damage due to collision with peripheral members is prevented.
By using the timing belt as the moving operation of the lifting device and the power transmission means as the structure of the plane moving means, even if the timing belt is inadvertently hit the peripheral member during the cargo handling operation, the peripheral member is not damaged.

Hereinafter, the illustrated embodiment will be specifically described as the best mode for carrying out the self-propelled small crane of the present invention.
The self-propelled small crane 1 of the present invention has a narrow passageway and a construction site where the crane installation space cannot be widened, for example, masonry work in a graveyard B as shown in FIG. 1, that is, installation and movement of a gravestone A as a suspended load Used for cargo handling work such as removal.
And since it is used in such a construction site, the illustrated self-propelled small crane 1 has a very compact outer dimension of 640 mm × 1800 mm × 2020 mm as an example in the retracted state shown in FIGS.
The vehicle width W of the transporting vehicle 3 of the self-propelled small crane 1 can travel in a narrow path of 582 mm as an example and a width of 60 cm, and the distance S between the main column 5 and the sub column 7 can be up to 4.5 m as an example. It becomes the composition which can respond.

  The self-propelled small crane 1 of the present invention includes a small transport vehicle 3 capable of traveling in a passage having a passage width of 60 cm as described above, and a main support column that is mounted on the transport vehicle 3 and stands vertically upward. 5 and a sub strut 7 provided at a position that is a predetermined distance away from the main strut 5 in the width direction X (the distance S between the struts), and is spanned between the sub strut 7 and the main strut 5. A horizontal support frame 9 that couples the two and a suspension device 11 that is suspended from the horizontal support frame 9 are provided.

The transport vehicle 3 has an engine 13 serving as a drive source, drive transmission means (not shown) that transmits the rotation of the output shaft of the engine 13 to the crawler 15, and rotation of the output shaft of the engine 13 that is transmitted via the drive transmission means. And a pair of left and right crawlers 15 moving forward and backward.
A rectangular frame-like base frame 17 is horizontally supported by a bracket 19 above the transport vehicle 3. An operation box 21 and the engine 13 are provided on the upper surface near the front of the base frame 17, and a hydraulic box 23 in which a hydraulic pump, a hydraulic oil tank, and the like are accommodated is provided on the upper surface near the rear of the base frame 17. Yes. Further, four adjuster pads 18 as fixing means extending downward are provided at four corners of the base frame 17 as an example.

A main column 5 is provided at the center of the base frame 17. The main column 5 is fixed to the base frame 17 in a fixed state, and the main column 5 is fitted into the fixed pole 25 in a nested manner from above. A movable pole 27 is provided.
The fixed pole 25 is a rectangular tube-shaped member having a larger diameter than the movable pole 27, and the movable pole 27 is configured to be nested. The movable pole 27 is configured to expand and contract the height of the main column 5 by being moved up and down by being driven by hydraulic pressure from a hydraulic pump (not shown) as an elevating device.

The sub-post 7 includes an upper pole 29 attached to the horizontal support frame 9 in a suspended state, and a lower pole 31 that fits into the upper pole 29 from below in a nested manner.
A winding device 33 is provided between the upper pole 29 and the lower pole 31. By operating the winding device 33, the relative positions of the upper pole 29 and the lower pole 31 are changed to increase the height of the sub-post 7. It can be stretched.
As shown in FIGS. 8 and 9, the winding device 33 includes a drum support bracket 40 and an operation handle 39 rotatably supported by the drum support bracket 40 on a side barrel portion slightly above the middle of the lower pole 31. The winding drum 41, the winding pulley 37 provided above the side body of the lower pole 31, and one end locked to the lower end of the upper pole 29 and fed upward, and then wound around the winding pulley 37. And a wire 35 that extends downward and has the other end locked to the winding drum 41.

Two horizontal base frames 43 each having a rectangular tube shape are provided as an example extending in the front-rear direction Y on the side body portion of the sub-post 7 near the lower end portion of the lower pole 31. A caster 45 as a traveling means and a jack bolt 47 as a fixing means are provided below and outside the front end portion of the front and rear horizontal base frames 43.
Further, as an example in which an adjuster pad 49 as a fixing means is provided at both ends in the middle portion of the horizontal base frame 43 extending forward, a square cylindrical auxiliary frame 51 rotates in the horizontal direction around a rotation shaft 55 extending from the clamp lever 53. It is provided freely.

Between the upper surfaces of both ends of the front and rear horizontal base frames 43 and the side trunk portion at a height near the middle of the lower pole 31, a reinforcing inclined frame 57 that acts like a brace is provided.
The horizontal support frame 9 is composed of two shape steel members as an example of being divided at an intermediate position. When used, the horizontal support frame 9 is appropriately integrated with a fixing bolt or the like by appropriately connecting a connecting plate (not shown) to the connecting portion. It is used as one frame long in the width direction X.
In addition, a commercially available electric chain block unit or the like can be used as the hanging load device 11 as an example, and a beam 63 that extends from the hanging load device 11 is movably provided in the horizontal direction X with respect to the horizontal support frame 9 in the middle. It is supported by the hanger 65 and extends to a generator (not shown) on the base frame 17.

The connection between the sub column 7 and the horizontal support frame 9 and the connection between the main column 5 and the horizontal support frame 9 are made through a fitting joint 59, and the fitting position of the fitting joint 59 with respect to the horizontal support frame 9 can be changed. By doing so, the strut distance S between the sub strut 7 and the main strut 5 can be adjusted.
The fixing of the fitting position of the fitting joint 59 is performed using the fixing bolt 61 as an example.

Between the horizontal support frame 9 and the suspended load device 11, the suspended load position of the suspended load device 11 is moved in the left-right direction X along the longitudinal direction of the horizontal support frame 9 and in the front-rear direction Y orthogonal thereto. A plane moving means 67 is provided.
The plane moving means 67 combines a left and right moving means 69 provided above that can move the suspended load position in the left and right direction, and a front and rear moving means 71 provided below that can move the suspended load position in the front and rear direction. Is made up of.

Of these, the left and right moving means 69 abuts on the horizontal support frame 9 that functions as a guide rail, four guide rollers 73 that roll on the horizontal support frame 9, and the edge of the lower surface of the horizontal support frame 9. As an example of rolling, four guide auxiliary rollers 75, the guide roller 73, an upper support bracket 77 that rotatably supports the guide auxiliary roller 75, and one of the guide rollers 73 are fixed to one end and the guides are fixed. A driving shaft 79 that rotates integrally with the roller 73, a timing pulley 81 that is fixed to the other end of the driving shaft 79, rotates together with the driving shaft 79, and is wound around the timing pulley 81 and hangs downward. And a timing belt 83 including an endless belt-like tensile core that functions as an operating means provided.
As an example of the drive shaft 79, a driven shaft 85 is provided on the right side in parallel with the drive shaft 79, and a small-diameter drive pulley 87 provided at an intermediate portion of the drive shaft 79 and a front end portion of the driven shaft 85. An endless belt-like transmission belt 91 that transmits the rotation of the drive shaft 79 to the driven shaft 85 is wound around the driven pulley 89 having a small diameter.

The guide roller 73 provided on the drive shaft 79 is a drive guide roller 73A, and the guide roller 73 provided on the driven shaft 85 is a driven guide roller 73B. The guide roller 73 is provided rearward so as to face these. The two guide rollers 73 are referred to as free guide rollers 73C.
The free guide roller 73 </ b> C is attached to a short shaft portion 95 extending horizontally from the upper support bracket 77 via a bearing 93 so as to freely rotate. The four guide auxiliary rollers 75 have a considerably smaller diameter than the guide roller 73, and are attached to the upper support bracket 77 so as to be freely rotatable, like the free guide roller 73C.

  Two upper support brackets 77 are provided so as to be opposed to each other by a rectangular flat plate member whose two lower corners are greatly chamfered. The upper support bracket 77 is provided with holes for supporting the shaft portions of the guide roller 73 and the guide auxiliary roller 75. Further, a square bar-shaped rail support member 97 is provided on the front and rear surfaces of the lower end portion of the upper support bracket 77, and a guide rail 99 in the forward / backward moving means 71 described below is attached using the rail support member 97. ing.

The back-and-forth moving means 71 uses a rail support member 97 to be attached to the lower end portion of the upper support bracket 77, and, as an example, four guide rollers 101 that abut against a part of the guide rail 99 and roll. A lower support bracket 105 provided with a suspension member 103 that supports the guide roller 101 rotatably and also supports the suspension device 11, and one of the guide rollers 101 is fixed to one end thereof. 101, a drive shaft 107 that rotates integrally with the drive shaft 101, a timing pulley 109 that is fixed to the other end of the drive shaft 107 and rotates together with the drive shaft 107, and an operation that is wound around the timing pulley 109 and suspended downward. And a timing belt 111 including an endless belt-like tensile core functioning as a means.
Further, as an example of the drive shaft 107, a driven shaft 113 is provided in the rear in parallel with the drive shaft 107, and a small diameter drive pulley 115 provided in the middle portion of the drive shaft 107 and a small diameter provided in the right end portion of the driven shaft 113. An endless belt-like transmission belt 119 for transmitting the rotation of the drive shaft 107 to the driven shaft 113 is wound around the driven pulley 117.

The guide rail 99 is a short member extending in the front-rear direction, and is made of, for example, a I-shaped steel.
The guide roller 101 provided on the drive shaft 107 is a drive guide roller 101A, and the guide roller 101 provided on the driven shaft 113 is a driven guide roller 101B. The guide roller 101 is provided on the left side so as to face them. The two guide rollers 101 are used as free guide rollers 101C.
The free guide roller 101C is attached to a short shaft portion 123 extending horizontally from the lower support bracket 105 via a bearing 121 so as to freely rotate.

Two lower support brackets 105 are provided so as to be opposed to each other by a rectangular flat plate-like member shorter than the upper support bracket 77 in which two lower corner portions are chamfered. The lower support bracket 105 is provided with holes for supporting the shafts of the guide roller 101.
In addition, a flat plate-like suspension member in which a long hole 127 for hooking the hook of the load device 11 is formed in the lower portion of the inner surface of the lower support bracket 105 that is sandwiched between two block-shaped spacers 125. 103 is provided.

Next, an operation mode or an operation procedure of the self-propelled small crane 1 of the present invention configured as described above will be described separately for (1) during the passage and (2) during the cargo handling operation.
(1) When traveling on the aisle (see FIGS. 4 and 5)
When the self-propelled small crane 1 is transported to the place where the construction site exists and is moved to the construction site through the passage, the self-propelled small crane 1 is set in the retracted state.
That is, as shown in the figure, the main support 5 is contracted, and the horizontal support frame 9 disassembled on the upper part of the main support 5 is horizontally stacked one above the other, and the main support 5 is fixed using a fixed band 129 or the like. Secure to. The sub-post 7 is also contracted and placed on the base frame 17 in a standing state, and is fixed to the main post 5 using a holder 131 or the like.
And the engine 13 is started, the crawler 15 is moved, the conveyance vehicle 3 is made into a driving | running | working state, and the self-propelled small crane 1 is moved to a construction site.
Since the self-propelled small crane 1 in the retracted state has an extremely compact form as described above, it can move smoothly even in a narrow passage.

(2) During cargo handling work (see Figs. 1, 2, 3, 6, 7, 8, 9)
When the self-propelled small crane 1 arrives at the construction site, the sub-post 7 and the horizontal support frame 9 are lowered from the transport vehicle 3 to be used as shown in FIGS. That is, the disassembled horizontal support frame 9 is connected to one and attached so as to be bridged over the main column 5 and the sub column 7 using the fitting joint 59, and a hydraulic pump (not shown) is started to operate the main column. 5 is extended to a predetermined height.
At this time, the fitting position between the fitting joint 59 and the horizontal support frame 9 is adjusted to a predetermined distance between the columns S, and then the fitting position is fixed using the fixing bolt 61 or the like.
Next, the operation handle 39 is turned to wind the wire 35 around the take-up drum 41, and the upper pole 29 in the sub-post 7 is moved upward to bring the horizontal support frame 9 into a horizontal state so that the upper pole 29 is moved by the pin 133. Fix to the lower pole 31.

The clamp lever 53 is set in the clamp release state, and the auxiliary frame 51 is rotated by 90 ° from the retracted state along the horizontal base frame 43 to the use state orthogonal to the horizontal base frame 43.
Then, the clamp lever 53 is brought into the clamped state again, the jack bolt 47 and the adjuster pad 49 on the sub-post 7 side, and the adjuster pad 18 on the main post 5 side are extended to fix the self-propelled small crane 1 at a predetermined installation position. .

Next, the suspended load A is held on the suspension hook 135 of the suspended load device 11 by using a wire, a rope or the like, and the suspended load device 11 is operated to lift the suspended load A to a predetermined height.
Then, the timing belt 83 in the left and right moving means 69 and the timing belt 111 in the front and rear moving means 71 are operated to rotate the respective timing pulleys 81 and 109 by a predetermined tooth pitch (15 mm pitch as an example), and the guide rollers 73 and 101 are moved. The suspended load A is moved to a predetermined installation position.

Next, the suspended load device 11 is operated to lower the suspended load A, which is then installed at a predetermined installation position.
The work space required for carrying out the cargo handling operation described above is extremely small, and the moving operation means of the suspended load A is made of flexible timing belts 83 and 111. Therefore, the suspended load A and the like collide with the peripheral members and the suspended load A And peripheral members are not damaged.
When moving the self-propelled crane 1 after unloading the suspended load A, the adjuster pad 18 is separated from the ground, and the jack bolt 47 is similarly separated from the ground. Further, the operator pushes the sub column 7 and causes the caster 45 to travel in accordance with the traveling of the plate-moving vehicle 3. In this way, the self-propelled crane 1 can be moved to the next work position without having to house the sub-post 7 holding support frame 9 one by one.
After the cargo handling operation is completed, the storage state shown in FIGS. 4 and 5 is set again, the passage is run again, and it is transported to a predetermined storage location and stored.

As described above, the illustrated embodiment has been described in detail as the best mode for carrying out the present invention, but the specific configuration of the present invention is not limited to the illustrated embodiment. Design changes and the like within a range not departing from the gist of the invention are also included in the present invention.
For example, the horizontal support frame 9 may have a folding structure with a hinge at the center, or may have a structure that can be expanded and contracted like the main support column 5 and the sub support column 7. Further, when the self-propelled small crane 1 of the present invention is used at a construction site where the grounding surfaces on the main column 5 side and the sub column 7 side are inclined, means for finely adjusting the fitting angle to the fitting joint 59. Can be added, members having a large adjustment range can be used as the jack bolts 47 and the adjuster pads 18, 49, and other fixing means for reinforcement can be used separately as accessories.

  INDUSTRIAL APPLICABILITY The present invention can be used in the manufacture and field of use of self-propelled small cranes used when carrying out cargo handling work at construction sites where the passage width is narrow and the crane installation space cannot be widened. It has the possibility to use it when you want to carry out cargo handling work efficiently and safely.

It is a perspective view which shows the use condition of the self-propelled small crane which concerns on embodiment of this invention. It is a front view which shows the use condition of the self-propelled small crane which concerns on embodiment of this invention. It is a left view which shows the use condition of the self-propelled small crane which concerns on embodiment of this invention. It is a side view which shows the retracted state of the self-propelled small crane which concerns on embodiment of this invention. It is a front view which shows the retracted state of the self-propelled small crane which concerns on embodiment of this invention. It is a front view which partially fractures | ruptures and shows the plane moving means in the self-propelled small crane which concerns on embodiment of this invention. FIG. 3 is a left side view showing a partially broken plane moving means in the self-propelled small crane according to the embodiment of the present invention. It is a sectional side view when the upper pole which shows the winding apparatus in the self-propelled small crane which concerns on embodiment of this invention exists in a lower limit position. It is a sectional side view when the upper pole which shows the winding apparatus in the self-propelled small crane which concerns on embodiment of this invention exists in an upper limit position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Self-propelled small crane 3 Transportation vehicle 5 Main support | pillar 7 Sub support | pillar 9 Horizontal support frame 11 Lifting load device 13 Engine 15 Crawler 17 Base frame 18 Adjuster pad (fixing means) 19 Bracket 21 Operation box 23 Hydraulic box 25 Fixed pole 27 Movable Pole 29 Upper pole 31 Lower pole 33 Winding device 35 Wire 37 Winding pulley 39 Operation handle 40 Drum support bracket 41 Winding drum 43 Horizontal base frame 45 Casters (traveling means) 47 Jack bolts (fixing means)
49 Adjuster pad (fixing means) 51 Auxiliary frame 53 Clamp lever 55 Rotating shaft 57 Inclined frame 59 Fitting joint 61 Fixing bolt 63 Cable 65 Beam hanger 67 Planar moving means 69 Left and right moving means 71 Back and forth moving means 73 Guide roller 73A Drive guide roller 73B driven guide roller 73C free guide roller 75 guide auxiliary roller 77 upper support bracket 79 drive shaft 81 timing pulley 83 timing belt 85 driven shaft 87 drive pulley 89 driven pulley 91 transmission belt 93 bearing 95 shaft portion 97 rail support member 99 guide rail 101 Guide roller 101A Drive guide roller 101B Follower guide roller 101C Free guide roller 103 Suspension member 105 Lower support bracket 107 Drive shaft 109 Timing pulley 111 Timing belt 113 Drive shaft 115 Drive pulley 117 Drive pulley 119 Transmission belt 121 Bearing 123 Shaft portion 125 Spacer 127 Long hole 129 Fixed band 131 Holding tool 133 Pin 135 Suspension hook A Tombstone (suspended load) B Graveyard W car Width S Distance between struts X Width direction (left-right direction) Y Depth direction (front-back direction)

Claims (8)

  A transport vehicle, a main column mounted on the transport vehicle and vertically erected upward, a sub-column provided at a predetermined distance in the width direction with respect to the main column, the sub-column and the main column A self-propelled small crane comprising: a horizontal support frame that is spanned between struts and connects the two, and a lifting device that is suspended from the horizontal support frame.   2. The self-propelled small crane according to claim 1, wherein the main support column is fixed to a base frame installed on a transport vehicle, and a fixed pole provided in a nested manner with respect to the fixed pole from above. A self-propelled small crane that is fitted with a movable pole that fits and moves up and down under the drive of a lifting device to expand and contract a main column.   3. The self-propelled small crane according to claim 1, wherein the sub-post is attached to a horizontal support frame in a suspended state, and the sub-post is externally fitted to the upper pole in a nested manner from below and wound. A self-propelled small crane comprising a lower pole that changes a relative position with respect to an upper pole by operating a take-off device and expands and contracts a sub-post.   4. The self-propelled small crane according to claim 3, wherein the lower pole is provided with traveling means for traveling in the passage and fixing means for fixing the sub strut at the installation location. Self-propelled small crane.   5. The self-propelled small crane according to claim 1, wherein the sub strut and the horizontal support frame are separated from the main strut at the time of storage so that the sub strut and the horizontal support frame can be accommodated on the transport vehicle in a disassembled, contracted, or folded state. A self-propelled small crane characterized by   The self-propelled small crane according to any one of claims 1 to 5, wherein a suspended position of the suspended load device is disposed between the horizontal support frame and the suspended load device in a left-right direction along a longitudinal direction of the horizontal support frame. And a self-propelled small crane characterized in that it is provided with a plane moving means that can be moved in the front-rear direction perpendicular to this.   7. The self-propelled small crane according to claim 6, wherein the plane moving means can move the suspended load position in the front-rear direction and the left-right moving means provided above which can move the suspended load position in the left-right direction. It is configured by combining forward and backward moving means provided below, and among these, the left and right moving means includes the horizontal support frame that functions as a guide rail, a plurality of guide rollers that roll on the horizontal support frame, and the guide An upper support bracket that rotatably supports the roller, one of the guide rollers fixed to one end, a drive shaft that rotates integrally with the guide roller, and a drive shaft that is fixed to the other end of the drive shaft and integrated with the drive shaft It functions as a rotating timing pulley and operating means that are wound around the timing pulley and suspended downward. Self-propelled small crane, characterized in that it comprises a timing belt of the endless belt.   The self-propelled small crane according to claim 7, wherein the front-rear moving means is attached to a lower end portion of the upper support bracket and extends in the front-rear direction, and a plurality of rollers that abut against a part of the guide rail and roll. A guide roller, a lower support bracket provided with a suspension member for rotatably supporting the guide rollers and the suspension device, and one of the guide rollers fixed to one end and integrated with the guide roller A rotating drive shaft, a timing pulley that is fixed to the other end of the drive shaft and rotates integrally with the drive shaft, and an endless belt that functions as an operating means that is wound around the timing pulley and suspended downward. A self-propelled small crane comprising a timing belt.

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