JPH10194677A - Luffing jib supporting device in boom crane provided with luffing jib - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform conveyance with an intermediate split link set along an intermediate split jib so as to facilitate handling of the intermediate split link by connecting the tip part of the intermediate split link to the tip side upper part of the intermediate split jib via a short length link before the intermediate split jib is assembled. SOLUTION: As a tension member 44 for supporting a luffing jib, a plurality of rod type split links 45A, 45, 45B are connected sequently by means of pins. A short length link 46 is connected to the tip side upper part of an intermediate split jib 42 in a luffing jib 4 so that the short length link 46 can be freely moved in the longitudinal direction and in the vertical direction of the intermediate split jib 42. On the other hand, the tip part 45b of the intermediate split link 45 is connected to the short length link 46 freely movably by means of a pin 48 before assembly of the intermediate split jib 42 is carried out, so that handling of the intermediate split link 45 in conveyance can be facilitated and luffing jib assembling work can be carried out with ease.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom crane with a luffing jib capable of assembling a luffing jib to a boom tip by a so-called vertical assembly, and more particularly to a luffing jib support device for such a boom crane with a luffing jib. Things.

[0002]

2. Description of the Related Art In a boom crane with a luffing jib of this type, the luffing jib is constructed by sequentially adding a plurality of divided jibs according to working conditions. In addition, a jib support is connected to the base end of the base division jib of the luffing jib in advance, and the luffing jib is assembled to the boom distal end via the jib support. And when assembling the luffing jib to the boom tip,
When split jib other than the base split jib are sequentially connected on a flat ground (referred to as a flat assembly method), each split jib is connected while being suspended from the boom tip while raising and extending the telescopic boom. (Referred to as a standing system).

[0003] In the method of assembling the luffing jib by the flat assembling method, it is necessary to sequentially connect each divided jib except for the base end divided jib in a straight line on a flat ground. Extra (long) space is required. Therefore, if there is no large surplus space for flat-laying the luffing jib at the work site, it is necessary to mount the luffing jib by the vertical setting method.

FIGS. 15 and 16 show a conventional boom crane with a luffing jib capable of assembling the luffing jib in an upright manner. Roughing jib 4
Are transported to the work site in a state where the divided jib 41 to 43 are separated from each other. Note that the base end divided jib 41 of the luffing jib 4 and the jib support 3 are transported in a state where they are connected in advance by the shaft 31.

In this type of boom crane with a luffing jib, a first mast 51 and a second mast 52 for supporting the luffing jib 4 when the luffing jib 4 is used, and a third mast 6 used when the luffing jib is erected. Is provided. In this conventional boom crane with luffing jib, the base end of the first mast 51 is pivotally mounted on the base end of the base division jib 41, and the second mast 52
Is pivotally attached to the upper end of the jib support 3 and the third mast 6 is erected and fixed above the jib support 3 near the front end. A roller 63 for supporting the tension rope 59 and the sub-rope 16 when the luffing jib is erected is attached to the tip (upper end) of the third mast 6.

[0006] In this conventional boom crane with luffing jib, the luffing jib 4 is assembled as follows.

First, as shown in FIG. 15, the base end of the jib support 3 that connects the base divided jib 41 to the distal end 21 of the telescopic boom 2 that has fallen down to a substantially horizontal posture in the boom reduced state. Pin-coupled (up and down, left and right). At this time, the distal end of the first mast 51 and the distal end of the second mast 52 are
A tension rope 59 having a distal end portion of the first mast 51 and a distal end portion of the base end divided jib 41 connected to each other by a stay rope 54, and a distal end connected to a distal end portion of the second mast 52.
1 and the main winch 13 (see FIG. 1) with the base end of the tension rope 59 bypassing the roller 63 of the third mast 6.
6) is connected to an aerial sheave around which the main rope 15 drawn out from above is wound.

Next, the sub winch 1 on the swivel 11
4 (see FIG. 16), is placed on the roller 63 of the third mast 6 along the upper surface of the telescopic boom 2, and the sheave 57 at the tip of the second mast 52 and the tip of the first mast 51. After being wound around the sheave 56, the tip 16a of the sub-rope 16 is suspended downward.

Next, when the main winch 13 is hoisted and the main rope 15 is pulled, the second mast 52 is first raised, and then the tension rod 53
The first mast 51 is raised when the user is nervous.
The winding operation of the main winch 13 is stopped when the stay rope 54 is tensioned. At this time, the first mast 51 and the second mast 52 are in the postures denoted by reference numerals 51 'and 52' in FIG.
The lower end of the front of 1 is grounded to the ground.

Next, the proximal end (upper left and right 2) of the next intermediate split jib 42 (FIG. 16) is attached to the distal end of the proximal split jib 41.
Location) and elevate the telescopic boom 2 by a predetermined amount.
In a state where the base division jib 41 and the first intermediate division jib 42 are extended linearly and continuously connected to each other, two lower right and left portions of both the division jib 41 and 42 are pin-coupled. As shown in FIG. 16, if a required number of intermediate divided jib 42 and leading end divided jib 43 are added while performing the raising / extending operation, a series of roughing jib 4 can be assembled.
The tip of the first mast 51 and the tip of the luffing jib 4 (tip split jib 43) are connected by a tension member 55 such as a wire rope or a rod. The tip of the sub rope 16 is wound around a sheave at the tip of the luffing jib 4, and a hanging hook is attached to the tip of the rope.

In the standing state of the luffing jib 4 shown in FIG. 16, the tension rope 5 connected to the main rope 15
9 is on the roller 63 at the tip of the third mast 6,
By winding the main winch 13, the second mast 52, the tension rod 53, the first mast 51
Further, the luffing jib 4 can be raised through the tension member 55. In the conventional boom crane with a luffing jib, the base end of the luffing jib 4 is connected to the lower end 2 of the boom tip 21 when the luffing jib 4 is fully assembled as shown in FIG.
In order to prevent interference with 1a, a jib support 3 having a considerable length (for example, about 4 to 5 m) is used.

By the way, during a crane operation using the luffing jib 4, a wire rope (tension rope) is conventionally used as a tension member 55 (installed between the tip of the first mast 51 and the tip of the luffing jib 4) for supporting the luffing jib 4. ) Is often used. Conventionally, a rod-type one is used as the tension member 55. In this case, the tension rod is composed of a plurality of divided links corresponding to the divided jibs 41 to 43. These split links form a series of tension rods by sequentially pin-connecting the ends of the split links when the luffing jib 4 is erected.

[0013]

However, when a wire rope is used as the tension member 55 as in the prior art, it is necessary to increase the number of the tension ropes 55 for a crane operation in which a large load is applied to the luffing jib 4. As described above, when the number of the tension ropes 55 increases, the work of connecting the tension wire ropes during the erecting work of the luffing jib 4 becomes complicated, and the workability of assembling the luffing jib deteriorates. Further, in the tension rope 55 of this type, the tension rope is separately fed when the divided jib 41 to 43 is conveyed, or the tension rope is tied to the divided jib, but handling is troublesome.

In the conventional rod-type tension member, since each divided link is temporarily fixed to the corresponding divided jib 41 to 43 and transported, the handling is easier than the case of a tension rope. The split link is
When the temporary fixing of the divided jib is released, the divided jib is completely free. In this way, if the split link to be connected is completely free,
At the time of connecting the split link, the end link hole of the split link suspended from the mast 51 and the end hole of the next split link are coupled with the fact that the split link has a considerable weight. There has been a problem that the work of polymerizing is difficult to carry out. That is, when the split link is completely free, when the split link is inclined, for example, the leading end (lower end) of the split link enters into the lattice of the jib or falls off from the jib. In some cases, it becomes difficult to connect the divided links.

An object of the present invention is to provide a luffing jib supporting apparatus which can easily assemble a tension member for supporting a luffing jib in view of the above-mentioned conventional problems.

[0016]

The present invention has the following structure as means for solving the above-mentioned problems.

The luffing jib with boom crane applied in the invention of claim 1 of the present invention the claims 1, to the tip of the telescopic boom, as the luffing jib formed by connecting a plurality of divided jib may be attached by Tatsugumi scheme Further, with the luffing jib attached to the boom distal end, the mast erected near the base end side of the luffing jib and the vicinity of the luffing jib distal end are connected by a rod type tension member to support the luffing jib. ing.

The luffing jib support according to the first aspect of the present invention has the following components.

First, the tension member is formed by sequentially connecting a plurality of divided links having substantially the same length to each divided jib with pins.

On the upper end side of the intermediate divided jib located at the intermediate portion of each divided jib, a short link can be moved within a predetermined range in the length direction and the vertical direction with respect to the intermediate divided jib. Are connected by As a connection structure of the short and small links, a vertically long hole can be formed in the short and small link, and the short and small link can be connected to the intermediate divided jib through a pin in the long hole.

Prior to assembling the intermediate split jib, the distal end of the intermediate split link corresponding to the intermediate split jib is detachably connected to a short link provided at the upper end of the intermediate split jib by a pin. doing.

In the luffing jib support device according to the first aspect, before assembling the intermediate split jib, the tip of the intermediate split link is pin-connected to the short and small link, and the intermediate split link is stored sideways on the intermediate split jib. Is done. Also, in the state where the intermediate split link is lying down, although the leading end of the intermediate split link is connected to the short split link, the intermediate split link is placed on the intermediate split jib within a range in which the short link can move with respect to the intermediate split jib. Can be slid in its length direction. In the state where the intermediate split link is lying down, the base end side of the intermediate split link may be held on the intermediate split jib by an appropriate temporary fixing member. Even in such a case, it is preferable that the intermediate split link be slidable on the intermediate split jib.

In order to assemble the luffing jib by the vertical assembly method, first, the base end divided jib is connected to the boom distal end via a jib support. At that time, the base end link is suspended from the mast tip. Next, carry the next intermediate split jib in the vicinity of the distal end of the proximal split jib. → Pin the distal end of the proximal split jib and the proximal end of the intermediate split jib (upper left and right two places) → Incline the mast Adjust the angle to bring the distal end of the proximal split link closer to the proximal end of the intermediate split link on the intermediate split jib side → overlap the distal end hole of the proximal split link and the proximal end hole of the intermediate split link to both ends. Pin the holes. At this time, since the distal end of the intermediate split link is connected to the short and small link, useless movement of the intermediate split link (for example, when the front end side of the intermediate split link enters the intermediate split jib when overlapping the two holes). Or falling off from the intermediate split jib). In addition, although the end of the intermediate split link is connected to the short / small link, the intermediate split link can be moved within the movable range of the short / small link. Movement becomes possible. Then, after the distal end portion of the base split link and the base end portion of the intermediate split link are pin-connected, the pin connecting the distal end portion of the intermediate split link and the short / small link is removed. With the base divided jib and the intermediate divided jib connected linearly by elevating and extending by a fixed amount, two lower left and right portions of the divided jib are pin-connected. Hereinafter, in the same manner, the required number of intermediate division jib and the tip division jib are added while performing the raising / extending operation of the telescopic boom 2,
Further, if a series of tension members are connected between the upper end portion of the mast and the front end portion of the luffing jib by connecting the respective split links (the intermediate split link and the front end split link), the assembly of the luffing jib is completed.

According to a second aspect of the present invention, there is provided a boom crane with a luffing jib according to the first aspect of the present invention, wherein the luffing jib has an upper portion on an end side of an intermediate split jib located at an intermediate portion of each split jib. The lower end of a short link having a vertically long hole formed on the side is pivotally connected with a pin, and the upper side of the short link is installed so that the upper side of the short link can swing within a predetermined range in the length direction with respect to the intermediate divided jib. doing.

Before assembling the intermediate split jib, the distal end of the intermediate split link corresponding to the intermediate split jib is detachably connected to the long hole of the short and small link with a pin which can slide in the long hole. I have.

In the first aspect of the present invention, the short and short links are movable in the length direction and the vertical direction with respect to the intermediate divided jib. While the intermediate split jib can be swung only in its length direction, the front end of the intermediate split link is connected to the short link so as to be vertically movable before assembling the intermediate split jib. The luffing jib supporting device according to the second aspect has the same function as that of the first aspect.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A luffing jib support device in a boom crane with a luffing jib according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 14. In this embodiment, a telescopic boom 2 is mounted on a vehicle 1 as a boom crane. A mounted mobile boom crane is employed. or,
This boom crane with a luffing jib allows the luffing jib 4 to be assembled in an upright manner.
The luffing jib 4 of this type is used for a large-sized boom crane. When the telescopic boom 2 is in the maximum extension state as shown in FIG. 1, the length of the telescopic boom 2 becomes, for example, about 40 m. There is also.

In the boom crane with a luffing jib of this embodiment, as shown in FIG. 1, a telescopic boom 2 which is raised and lowered by a raising and lowering cylinder 12 is mounted on a swivel 11 of a vehicle 1, and is attached to a distal end 21 of the telescopic boom 2. The structure is such that the luffing jib 4 can be mounted in a vertical manner via the jib support 3. Note that the distal end 21 of the telescopic boom 2 is the distal end of the distal boom 20, and in the following description, the distal end 21 may be referred to as the boom distal end.

The turntable 11 of the vehicle 1 has a main winch 13 and a sub winch 14 mounted thereon. A main rope 15 is fed from the main winch 13 and a sub rope 16 is fed from the sub winch 14.

The roughing jib 4 is, in this embodiment,
Base division jib 41 and four intermediate division jib 42, 42 ...
And a total of six divided jib of the front divided jib 43. These divided gibs 41, 42, 43 are conveyed to the work site in a state where they are separated from each other. The number of intermediate divided jib 42 used can be appropriately set according to the operation.

As shown in FIG. 3, the base end of the base divided jib 41 is pivotally connected to the lower end of the jib support 3 in advance by a shaft 31, so that the base divided jib 41 and the jib support 3 are integrated. It is handled in a state of being converted. In addition, the base end split jib 41
Can rotate up and down around the pivot shaft 31 with respect to the jib support 3.

The jib support 3 is pin-connected to the front surface of the boom tip 21 at four locations, that is, up, down, left and right.
When the jib support 3 is connected to the boom distal end 21, the pivot portion (the pivot shaft 31) between the base end divided jib 41 and the jib support 3 is moved from the lower surface 20 a of the distal boom 20 in the boom horizontal posture. The lower surface is positioned below by a considerable height T (FIG. 1 or 2) in the vertical direction. Incidentally, the height T in this embodiment is 200
It is set to about mm.

The luffing jib 4 is assembled by connecting the divided jibs 41, 42 and 43 sequentially through the states shown in FIGS. 13 and 14, as will be described later, to a final standing posture as shown in FIG. . In the luffing jib final standing posture shown in FIG. 1, the telescopic boom 2 is usually raised up to an angle of about 60 to 65 °, and the luffing jib 4 is tilted forward and downward by an angle of about 5 to 10 ° with respect to the vertical line. Posture. Therefore, in the final assembled state of the roughing jib 4,
The angle between the axis of the telescopic boom 2 and the axis of the luffing jib 4 is about 40 to 30 °, and the base end divided jib 41 and the front lower end 21a of the boom tip 21 (slightly below the lower surface of the tip boom 20 in the boom horizontal position) (Protruding). On the other hand, at the time of assembling the luffing jib, the telescopic boom 2 may be erroneously raised, for example, to an angle of about 75 to 80 °, or an operation of suspending the luffing jib 4 in a vertical position may be performed. In the final assembled state of the luffing jib 4, it is necessary to prevent the base end divided jib 41 from interfering with the front lower end 21 a of the boom tip 21.

By the way, in this embodiment, the pivotal joint between the base end divided jib 41 and the jib support 3 (the pivot shaft 31).
The lower surface 20 of the tip boom 20 in the boom horizontal position.
1, the lower end portion 21a of the base dividing jib 41 and the front end portion 21a of the boom distal end portion 21 in the final standing state of the luffing jib 4 as shown in FIG. 15 and FIG. 1, the length of the jib support 3 is correspondingly increased.
6 can be significantly reduced as compared with the conventional jib support length (about 4 to 5 m). In this embodiment, the length of the jib support 3 is set to about 1.4 m. As described above, when the pivot portion 31 is located below the lower surface 20a of the distal end boom in the boom horizontal posture, even if the length of the jib support 3 is reduced to, for example, about 1.4 m, the telescopic boom 2 is erroneously set. For example, even when the jig 41 is raised up to an angle of about 75 to 80 degrees or the luffing jib 4 is suspended in a vertical posture, the base end divided jib 41 does not interfere with the front lower end 21 a of the boom tip 21.
Also, when the length of the jib support 3 is shortened,
In FIG. 3, the overall length L in a state where the base division jib 41 and the jib support 3 are integrally connected can be reduced.

In order to support the luffing jib 4 when the luffing jib 4 is used, the first mast 5 having a long length (for example, a length of about 6 to 7 m) disposed in front and rear thereof is used.
1 and the second mast 52 are required. This first mast 5
Each of the first and second masts 52 connects the left and right two columns with a reinforcing material. In addition, near the base end between the struts of the first mast 51 and the second mast 52, the base divided jib 41 is used.
Has an interval substantially equal to the left-right interval. And, near each base end of the first mast 51 and the second mast 52,
Spaces 58, 58 are formed below the connecting members indicated by reference numerals 51a, 52a, respectively. This space 5
8 and 58 are the third mast 6 and the step 7 as described later.
It is for diving. Further, sheaves 56,
57 are attached. In the use state, the first mast 51 is located on the front side and the second mast 52 is located on the rear side.

Further, in this embodiment, the base ends of the first mast 51 and the second mast 52 are pivotally mounted on the upper end of the base divided jib 41, and during transportation, as shown in FIG. 1
The mast 51 and the second mast 52 can be stored sideways on the base division jib 41. In a state where both the first and second masts are stored (turned down) on the base end divided jib 41, the first mast 51 is located below and the second mast 52 is located above. A bendable tension rod 53 is interposed between the tip of the first mast 51 and the tip of the second mast 52,
A tension rod 60 with a tension rope 59 is connected to the distal end of the second mast 52, and a stay rope 54 is connected to the distal end of the first mast 51.

A back stopper device 8 is provided above the jib 41 and the jib support 3. The back stopper device 8 is for preventing the luffing jib 4 from falling backward due to the movement of the center of gravity when the second mast 52 and the first mast 51 are caused during the luffing jib operation. The back stopper device 8 has a hydraulic cylinder 81 mounted on the jib support 3 side and a stopper 82 mounted on the base end divided jib 41 side, and the stopper 82 and the hydraulic cylinder 81 are pinned. It can be detachably connected.

On the upper surface of the jib support 3, a third mast 6 is provided.
Has been fixed. This third mast 6 is shown in FIGS.
As shown in FIG. 7, a roller 63 is attached near the upper end between a pair of right and left columns 61, 61, and the columns 61, 61 are fixed by laterally extending retaining members (a pair of right and left) 62. The left and right width of the third mast 6 is formed to be slightly smaller than the distance between the left and right supports of the second mast 52 near the base end. The pillars 61 of the third mast 6 are slightly inclined forward with their lower ends attached to the upper surface near the distal end of the jib support 3, and the roller 63 is divided into the base divided jib 41 and the jib support 3. (The pivot shaft 31 portion). When the roller 63 is positioned just above the pivot portion (the pivot shaft 31) in this way, the roller is retracted backward from directly above the pivot portion as in the conventional example shown in FIG. In this case, the moment when the second mast 52 is raised when the luffing jib is erected can be made larger, and the length of the column 61 projecting upward can be shortened accordingly. In this embodiment, the height of the upper end of the column 61 is set to be slightly lower than the maximum height of the second mast 52 in the retracted state as shown in FIG.

By the way, when the upper end of the third mast 6 is located just above the pivot portion (the pivot shaft 31),
As shown in FIG. 2, when the second mast 52 is raised, the second mast 52 is displaced rearward beyond the third mast 6, but near the base end of the second mast 52. ,
A space portion 58 for allowing the third mast 6 to dive is formed. Therefore, even if the second mast 52 and the third mast 6 intersect in a side view, the second mast 5
The second space portion 58 can prevent interference between the second mast 52 and the third mast 6.

A walking platform 64 is mounted between the left and right stay members 62 on the third mast 6, as shown in FIG.
The walking platform 64 is installed so as to extend between the vicinity of the upper surface near the base end of the jib support 3 and the vicinity of the upper end of the third mast 6. The pedestal 64 is installed in a substantially horizontal posture or slightly inclined so as not to hinder walking on the pedestal 64.

As shown in FIG. 3, when the first mast 51 and the second mast 52 are stored on the base division jib 41, the upper end of the third mast 6 and the base end of the second mast 52 are provided. Although there is a considerable height difference (1 m or more) from the upper surface, this boom crane with a roughing jib requires the third mast 6
(Stairs) between the vicinity of the upper end portion and the vicinity of the upper surface near the base end of the second mast 52 stored on the base division jib 41.
7 is interposed. In this embodiment, the rear end of the step is supported by the support member 71 from the jib support 3 side, while the front end of the step is supported by the support member 7 from the base split jib 41 side.
2 support. That is, this step 7 is supported over both the jib support 3 and the base end divided jib 41. Note that this step 7 is performed in the used state (when the base end divided jib 41 is inclined at an angle of about 15 to 20 degrees when the boom is in a horizontal position and the distal end of the base end divided jib 41 is in contact with the ground). 7 is the third mast 6
It is installed so as to be close to the tip of the side pedestal 64. The step 7 is formed to have a considerably small width as shown in FIG. 4 so as to be able to freely dive in the spaces 58 near the base ends of the first mast 51 and the second mast 52. Has become. Note that in other embodiments, step 7
May be supported only from the base end divided jib 41 or only from the jib support 3 side.

The roughing jib 4 is supported by a tension rope 59 connected to the main rope 15, a second mast 52, a first mast 51, a tension rod 53 between the masts 51 and 52, and a tension member 44. ing.

The tension member 44 connects the distal end of the first mast 51 and the distal end of the luffing jib 4, and a rod-type one is used as the tension member 44. The tension member 44 has a pair of left and right sides, and each of the divided jib 41, 42, 4
Split links 45A, 45, 45B of approximately the same length as 3
Are sequentially connected. Reference numeral 45A is a base end link, 45 is an intermediate split link, and 45B is a front end link.

Next, a specific example of the luffing jib support device will be described. FIGS. 5 to 9 show the first embodiment of the present invention, and FIGS.
11 to 11 show the second embodiment, and FIG. 12 shows the luffing jib support device of the third embodiment.

In the luffing jib support device of the first embodiment shown in FIGS. 5 to 9, a pair of short links 46, 46 on the left and right sides are attached to the upper end of each intermediate divided jib 42. Each short link 46 of the first embodiment
Is an upper block 66 having a hook-shaped connecting plate 68 (FIG. 8) interposed between two side plates;
6 has a pair of right and left U-shaped rods 67, 67 extending downward from both outer surfaces on the lower side. Each U-shaped bar 67 is welded to each outer surface of the upper block 66. A vertically long hole 47 is formed in the U-shaped rods 67, 67. The length of the elongated hole 47 is, for example, 1
It may be about 00 to 150 mm. The short links 46, 46 are attached to the intermediate split jib 42 by inserting pins (shafts) 49 provided laterally at the upper end of the intermediate split jib 42 into the long holes 47, 47, respectively. Have been. Accordingly, each short link 46 can swing back and forth or move up and down with respect to the pin 49 in the range of the long hole 47.

Each of the short links 46, 46 is provided with a tip 45b of the intermediate split link 45, 45, respectively.
8, 48, so as to be detachably connected. The distal end portion 45b of the intermediate split link is connected within the space between the left and right side plates in the upper block 66 of the short link 46. Then, the intermediate split jib 42
Before assembling, two intermediate split links 45, 45 are connected to one short split link 46, 4 for one intermediate split jib 42, respectively.
6 and is stored along the upper surface of the intermediate split jib 42.

Each of the intermediate split links 45, 45 is temporarily held by two front and rear holders 50, 50, respectively, in order to prevent the base end 45a from swinging left and right on the intermediate split jib 42. The holder 50 is provided with the intermediate link 4
The guide 5 is simply guided from the left and right, and the intermediate split link 45 can be removed from the holders 50, 50 simply by lifting the base end of the intermediate split link 45. A slide plate 50a is provided at the bottom of the holders 50, 50, and the intermediate split link 45 is provided on the slide plates 50a, 50a in the longitudinal direction of the intermediate split jib within the range of swinging of the short link 46 in the longitudinal direction. You can slide to. Therefore, as shown in FIG. 8, the intermediate split link 45 is moved from the intermediate split jib 42 to the base end side (rightward).
, The short link 46 is displaced rightward as indicated by reference numeral 46 ', and conversely, the split link 45 is moved to the intermediate split jib 42.
When it is pushed to the front end side (left direction), the short link 46 is displaced to the left as indicated by reference numeral 46 ", and the divided link 45 can slide left and right within a predetermined small range. .

In FIG. 8, when the intermediate split link 45 is raised upward by a predetermined angle as indicated by reference numeral 45 ', the outer peripheral portion 45c of the distal end 45b' of the intermediate split link 45 ' The end of the connecting plate 68 is abutted. The outer peripheral portion 45c of the leading end of the intermediate split link is thus connected to the connecting plate 68.
In this state, the short link 46 is prevented from rotating in the clockwise direction, so that the raised intermediate split link 45 'does not drop from the pin 49 toward the base end of the jib. A lattice (reinforcing rod) 4 is provided on the upper surface of the intermediate divided jib 42 on the side closer to the jib base end than the pin 49.
2a is attached, and when the distal end portion 45b of the intermediate split link 45 falls toward the base end side of the jib from the pin 49, there occurs a problem that the distal end portion 45b collides with the lattice 42a. The collision problem can be prevented by abutting the outer peripheral portion 45c of the leading end of the split link.

In the luffing jib support device of the first embodiment shown in FIGS. 5 to 9, the intermediate split link 45 can be carried along the upper surface of the intermediate split jib 42 when the intermediate split jib 42 is carried. As described above, the handling is easier than when a wire rope is used as the tension member. When assembling the intermediate divided jib 42 with the intermediate divided link 45 as shown in FIG. 9, the front end 45b of the intermediate divided link 45 is connected to the short link 46, and the base divided The end 45a side is slightly lifted (state of the reference numeral 45 '), and the lower end 45b (pin hole) of the divided link 45 which is hung downward and the base end 45a (pin hole) of the intermediate divided link 45 in the horizontal position. Is polymerized. At this time (when the two pin holes are overlapped), since the distal end portion 45b of the intermediate split link 45 in the horizontal orientation is connected to the short / small link 46, useless movement of the intermediate split link 45 (for example, (The leading end side does not enter the intermediate split jib or fall off from the intermediate split jib). The intermediate link 45 to be connected has its distal end 45b connected to the short link 46, but the intermediate split link 45 is connected to the short link 4
Since it is possible to move within the movable range of No. 6, it is possible to perform adjustment movement when the two holes are overlapped.
Therefore, the hole alignment work at the time of connecting the two divided links 45, 45 becomes easy. Also, when the intermediate split link 45 is slid in the jib length direction in the horizontal position, the short link 4
6 swings, at which time the short link 46
Is supported by the long hole 47, so that the short link 46
The tip 45b of the intermediate split link 45 moves in the horizontal direction without being lifted with the swing of the intermediate link 45, so that the intermediate split link 45 moves smoothly. In this way, the intermediate link 45 is connected to the short link 4
In the case where the slides are continuously connected at 6, particularly when the intermediate divided jib 42 is flatly assembled on the ground, the connecting operation of the divided links 45 is particularly easy.

In the luffing jib support device of the second embodiment shown in FIGS. 10 and 11, a modification of the short link 46 is shown. The short link 46 of the second embodiment is
A vertically long hole 47 is punched out near the lower part of the plate material. The short link 46 is attached by inserting a pin 49 of the intermediate divided jib 42 into the elongated hole 47 at the upper end of the intermediate divided jib 42 at the front end side. Also in this case, the short link 46 is
9 is movable in the jib length direction and in the vertical direction within the range of the elongated hole 47. The distal end 45 b of the intermediate split link 45 can be detachably connected to the upper end of the short link 46 by a pin 48.

In the second embodiment, the short link 4
6 is surrounded by a frame body 90 near the lower end. The frame body 90 has a front frame 92 and a rear frame 91 on each of the front and rear sides in the swing direction of the short link 46. The front frame 92 moves when the intermediate split link 45 is moved forward (to the left in FIG. 10) (the short link 46 is displaced to the position indicated by the reference numeral 46 ').
The front surface of the short link 46 'near the lower end abuts on the upper end of the front frame 92, so as to restrict the short link 46 from further turning left. Therefore, even if the intermediate split link 45 is raised upward as indicated by the reference numeral 45 'in FIG. Frame 92
(A position that abuts against). Also, as shown in FIG. 11, when the action of moving the intermediate divided link 45 to the right while the intermediate divided link 45 is raised is applied, as shown in FIG. The lower surface 45d of the 45b abuts against the upper end of the rear frame 91, and acts to prevent the tip end portion 45b of the intermediate split link from moving further downward. When the distal end portion (lower end portion) 45b of the intermediate split link falls from the pin 49 toward the base end of the jib, the distal end portion 45b becomes the lattice 42a.
However, the rear frame 91 can prevent such a problem.

Each configuration of the first embodiment and the second embodiment corresponds to claim 1 in the claims.

In the luffing jib support device of the third embodiment shown in FIG. 12, the short link 46 is attached by pivotally connecting the lower end of the short link 46 to the upper end of the intermediate split jib 42 with a pin 49. Therefore, in the third embodiment, the short link 46 only swings back and forth with respect to the pin 49 and does not move up and down. A vertically long hole 47 is formed on the upper side of the short link 46, and the tip 45 b of the intermediate split link 45 is detachably connected to the long hole 47 by a pin 48. . In the third embodiment, when the intermediate split link 45 is slid left and right on the intermediate split jib 42, the short link 46 only swings back and forth. Since it is relatively displaced up and down, the leading end portion 45b of the intermediate split link moves in the horizontal direction without being lifted. still,
Also in the case of the third embodiment, a frame body 90 similar to that of the second embodiment is provided, and the front frame 92 and the rear frame 91 operate in the same manner as in the second embodiment.

In the boom crane with a luffing jib of this embodiment, when the luffing jib 4 is transported, the luffing jib 4 is transported in a state of being separated into the divided jib 41, 42, 43. At that time, the base division jib 41 and the jib support 3
As shown in FIG. 3, the jib support 3 is conveyed in a state of being integrated by the pivot shaft 31. In this embodiment, the length of the jib support 3 is shortened (for example, 1.4 m). The overall length L of the jib support 3 is considerably shorter than that of the conventional example shown in FIG.
Further, since the height of the third mast 6 is reduced, the total height of the base end divided jib 41 and the jib support 3 at the time of conveyance is not increased, which is advantageous in terms of height limitation at the time of conveyance. further,
Each intermediate split link 45 of the tension member 44 is conveyed in a state where it is stored on the upper surface of the intermediate split jib 42, so that handling of the intermediate split link 45 becomes easy.

Each divided jib is sequentially connected to the boom distal end 21 at the work site. First, the jib support 3 is lifted up by another crane from the state shown in FIG. Connected to boom tip 21. still,
At that time, the hydraulic cylinder 81 and the stopper 82 of the back stopper device 8 are pin-coupled. At this time, the base end of the base end split link 45A of the tension member 44 is connected to the front end of the first mast 51.

After the jib support 3 is connected to the boom distal end 21, the distal end of the first mast 51 and the distal end of the base split jib 41 are connected with the stay rope 54 → the tension rope 59.
Is placed on the roller 63 of the third mast 6, and then the tip of the tension rope 59 and the tip of the main rope 15 from the main winch 13 are connected. → The sub rope 16 from the sub winch 14 is placed on the roller 63. rear,
The distal end side 16a of the sub rope 16 is guided to the distal end side of the base end divided jib 41. At that time, the worker is
The jib support 3 is moved from the telescopic boom 2 to the base divided jib 41 via the jib support 3 with the 6a. However, there is a pedestal 64 above the jib support 3 and the step 7 is subsequently installed. The portion having a poor scaffolding from the top of the boom 21 to the top of the base split jib 41 is moved to the walking platform 64.
And it can walk easily and safely on the step 7.

Next, the main winch 13 is hoisted up to raise the second mast 52 and the first mast 51 until the stay rope 54 is tensioned as shown in FIG. At this point, the intermediate divided jib 4 in FIG.
2 is not connected.

Subsequently, the pin connection of the back stopper device 8 is released, and the next intermediate divided jib 42 is carried by another crane to the distal end of the proximal divided jib 41. As shown in FIG. The upper end of the upper end of the intermediate split jib 42 and the upper end of the intermediate split jib 42 are connected by pins. Thereafter, the first mast 51 and the second mast 52 are slightly tilted forward, and the lower end portion (pin hole) of the base end split link 45 </ b> A hung from the distal end of the first mast 51 and the split link on the intermediate split jib 42. The base end portion 45a (pin hole) of 45 is overlapped with the two, and the two are pin-coupled. → The pin 48 (FIGS. 8 to 12) of the distal end portion 45b of the split link 45 on the intermediate split jib 42 side is removed. 2 is raised and extended by a predetermined amount to linearize the base division jib 41 and the intermediate division jib 42 as shown in FIG. 14 → the distal end lower end of the base division jib 41 and the intermediate division jib 42 The base end and the lower end are pin-connected.

Thereafter, as shown in FIG. 14, the next intermediate divided jib 42 is carried to the vicinity of the front end of the intermediate divided jib 42 connected earlier and connected in the same manner, and the required number of intermediate divided jib 42, 42 and If the tip split jib 43 is connected, FIG.
As shown in FIG. 7, the entire luffing jib 4 can be set up. It is a matter of course that the intermediate split links 45 and the leading end link 45B are sequentially connected in parallel with the connection of each split jib.

[0060]

According to the first and second aspects of the present invention, the following effects can be obtained.

(1) The tension member 44 is mounted on each divided jib 4
The intermediate split link 45 corresponding to the intermediate split jib 42 has a front end portion 45b of the intermediate split link before and after assembly of the intermediate split jib. Since the intermediate split jib 42 is connected to the upper end side of the intermediate split jib 42 via 46, the intermediate split link 45 can be carried along the intermediate split jib 42 during transport, and handling of the intermediate split link 45 becomes easy.

(2) The intermediate split link 45 has a tip 4
5b is connected to the upper end of the intermediate split jib 42 via the short link 46, the connecting operation can be performed on the previous split link. Therefore, the distal end of the intermediate split link 45 to be connected is stabilized. In addition, handling of the intermediate split link at the time of the connection work becomes easy.

(3) Tip 45b of the intermediate split link 45
Can be moved in the length direction and the vertical direction of the intermediate split jib 42 via the short link 46, so that the pin between the base end 45 a of the intermediate split link 45 and the distal end 45 b of the previous split link is used. During the hole alignment operation, the intermediate split link 45 to be connected can be adjusted and moved, so that the pin alignment can be easily performed.

(4) Since the distal end portion 45b of the intermediate split link 45 is movable up and down via the short link 46, the short link 46 is swung in the length direction with respect to the intermediate split jib 42. Even when the split link is rocked, the intermediate split link tip 45b moves in the horizontal direction without being lifted when the short link swings. It can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a side view of a boom crane with a luffing jib according to an embodiment of the present application, in a luffing jib final assembled state.

FIG. 2 is a partial side view of the boom crane with a luffing jib of FIG.

FIG. 3 is a side view of a boom crane with a luffing jib according to an embodiment of the present invention before a jib support with a base end divided jib is connected to a boom distal end;

FIG. 4 is a partial plan view showing a state where the jib support with a base end divided jib of FIG. 3 is connected to a boom distal end portion.

FIG. 5 is a side view of an intermediate split jib to which the luffing jib support device of the first embodiment of the present application is applied.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is an enlarged view taken on line VII-VII of FIG. 5;

FIG. 8 is an enlarged view taken along VIII-VIII in FIG. 7;

FIG. 9 is an explanatory diagram of a method of connecting an intermediate divided jib in a boom crane with a luffing jib using the luffing jib support device of the first embodiment of the present application.

FIG. 10 is a diagram corresponding to FIG. 8 in the luffing jib support device of the second embodiment of the present application.

FIG. 11 is a change diagram from FIG.

FIG. 12 is a diagram corresponding to FIG. 8 in the luffing jib support device of the third embodiment of the present application.

FIG. 13 is an explanatory diagram of a luffing jib erecting method of the boom crane with a luffing jib according to the embodiment of the present application.

FIG. 14 is a change diagram from FIG.

FIG. 15 is an explanatory view of a method of assembling a luffing jib of a conventional boom crane with a luffing jib.

FIG. 16 is a side view of a conventional boom crane with a luffing jib in a luffing jib final assembled state.

[Explanation of symbols]

2 is a telescopic boom, 3 is a jib support, 4 is a roughing jib, 21 is a boom tip, 41 is a base split jib, 42 is an intermediate split jib, 43 is a distal split jib, 44 is a tension member, 45 is an intermediate split link, 45A is a base end split link, 45B is a front end split link, 45b is a front end portion, 51 is a first mast, and 52 is a second mast.

Claims (2)

[Claims] 1. A telescopic boom (2) having a distal end (21)
A luffing jib (4) formed by connecting a plurality of divided jib (41, 42, 43) can be attached by an upright method, and the luffing jib (4) is attached to a boom tip (21) while the luffing jib (4) is attached to the boom tip (21). The rod-type tension member (44) connects the mast (51) erected near the base end side of (4) and the vicinity of the luffing jib tip.
In a boom crane with a luffing jib (4) that is connected by a jig (4), the tension member (44) includes
, 42, 43) and a plurality of divided links (45A, 45, 45B) each having substantially the same length are sequentially connected by pins, and the intermediate divided jib (42) located at the intermediate portion of each divided jib is constituted. ), A short link (46) is connected to the intermediate divided jib (42) so as to be movable within a predetermined range in the length direction and the vertical direction of the intermediate divided jib (42). Before assembling (42), the distal end (45b) of the intermediate split link (45) corresponding to the intermediate split jib (42) is detachably connected to the short link (46) by a pin (48). A luffing jib support device for a boom crane with a luffing jib. 2. The telescopic boom (2) has a distal end (21),
A luffing jib (4) formed by connecting a plurality of divided jib (41, 42, 43) can be attached by an upright method, and the luffing jib (4) is attached to a boom tip (21) while the luffing jib (4) is attached to the boom tip (21). The rod-type tension member (44) connects the mast (51) erected near the base end side of (4) and the vicinity of the luffing jib tip.
In a boom crane with a luffing jib (4) that is connected by a jig (4), the tension member (44) includes
, 42, 43) and a plurality of divided links (45A, 45, 45B) each having substantially the same length are sequentially connected by pins, and the intermediate divided jib (42) located at the intermediate portion of each divided jib is constituted. ), A vertically long slot (4
7) Connect the lower end of the short link (46) with the pin (4).
9), the upper side of the short link (46) is installed so as to be able to swing within a predetermined range in the longitudinal direction with respect to the intermediate split jib (42), while the intermediate split jib (42) is installed. Before assembling of the intermediate split jib (42), the front end (45b) of the intermediate split link (45) corresponding to the intermediate split jib (42) is inserted into the slot (4) of the short link (46).
7) A luffing jib support device for a boom crane with a luffing jib, which is detachably connected to the elongate hole (47) by a pin (48) slidable in the elongated hole (47).