JPH0769585A - Crane boom assembly - Google Patents

Abstract

PURPOSE:To improve workability by easily projecting each stay for a main rope from an intermediate boom. CONSTITUTION:The tension fitting 31A of each bracket 31 is fixed to front and rear pipes 17 and 17 laid above an intermediate boom 8, and an intermediate reinforcement pipe 18, using a nut 32 or the like. Also, the holder 31B of each bracket 31 is provided with each stay 33 in such a way as vertically slidable. A main rope 25 is connected to the upper end of each stay 33, and a rope 38 is led along the lower end thereof. One end of the rope 38 is hooked to a fastener 34 and the other end thereof is pulled in an arrow B direction, thereby keeping each stay 33 at a projected position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane boom assembly suitably used in, for example, a crawler type crane, a tower crane, etc. The present invention relates to a crane boom assembly that can be assembled.

[0002]

2. Description of the Related Art FIGS. 3 to 8 show a crawler type crane provided with a prior art crane boom assembly.

In the drawing, 1 is a lower traveling body, 2 is an upper revolving body which constitutes a crane main body provided on the lower traveling body 1 so as to be rotatable, and the upper revolving body 2 has an A-shaped frame 3 and With the counter weight 4 etc.,
A hoisting drum 5 and a boom / elevation drum (not shown) are provided.

Reference numeral 6 denotes a crane boom assembly which is provided on the front part of the upper swing body 2 so as to be able to move up and down. The crane boom assembly 6 is rotatably attached to the front part of the upper swing body 2. Of the intermediate booms 8, the lower boom 7 and, for example, three intermediate booms 8, 8, ... Which are integrally connected to the tip end side of the lower boom 7 via connecting pins (not shown) or the like. The upper boom 9 is connected to the intermediate boom 8 on the front end side via a connecting pin or the like, and the sheave 11 for the hoisting rope 10 is attached to the front end side of the upper boom 9. Then, the hoisting rope 10 is hoisted by the hoisting drum 5,
The hook 12 is wound down, and the hook 12 is moved up and down from the lower side of the sheave 11.

Denoted at 13 is a depression / elevation rope which is fed out from the boom depression / elevation drum of the upper revolving structure 2 via the A-shaped frame 3 and is inserted into the pendant rope 15 via the bridle 14. The front end side of the pendant rope 15 is connected to the front end side of the upper boom 9. The crane boom assembly 6 is lifted upward via the pendant rope 15 when the boom raising / lowering rope 13 is fed by the boom raising / lowering drum. Be moved to. The pendant rope 15 is divided into a plurality of pendant ropes 15, 15, ... When the crane boom assembly 6 is disassembled as shown in FIG. 4 and FIG. (Not shown) or the like.

Next, the intermediate boom 8 of the crane boom assembly 6 will be described in detail with reference to FIGS. 6 to 8.

In the figure, 16, 16, ... Are long frame pipes 17, 17 which are spaced apart from each other at the top, bottom, left and right and extend in the front-rear direction.
7, ... Are provided at both ends of each frame pipe 16
The connecting pipes connecting the two are shown, and each connecting pipe 17 forms a quadrangular frame structure together with each frame pipe 16 and constitutes a frame body of the intermediate boom 8.

Reference numerals 18 and 18 denote reinforcing pipes obliquely joined between the frame pipes 16. The reinforcing pipes 18 together with the front and rear connecting pipes 17 are substantially triangular trusses between the frame pipes 16. The frame pipes 16 and the connecting pipes 17 have a structure to increase the bending strength and the torsional strength. Further, other reinforcing pipes 19, 19 for obliquely connecting the upper and lower frame pipes 16, 16 are provided on both ends of each frame pipe 16, and each reinforcing pipe 19 is a front and rear connecting pipe. 17 extend in a diagonal direction.

Reference numerals 20 and 21 denote connecting fittings joined to the front and rear ends of the frame pipe 16. The connecting fittings 20 and 21 are provided at both ends of the frame pipe 16, respectively, and connect the intermediate booms 8 to each other. At this time, the connecting fitting 20 is inserted into the bifurcated connecting fitting 21 and the two are joined by a connecting pin or the like. In addition, the tip side of the lower boom 7 and the upper boom 9
As shown in FIG. 5, a similar connecting fitting 20 (2
1) is provided by being joined.

22 are connected to the upper connecting pipe 17,
17 and a bracket attached to the reinforcing pipe 18, each bracket 22 is composed of a tightening metal fitting 22A, a holder 22B and the like.
Alternatively, the reinforcing pipe 18 is attached by being fastened to the middle portion in the longitudinal direction via a nut 23 or the like. The holder 22B of each bracket 22 holds each stay 24, which will be described later, slidably up and down, and allows each stay 24 to move up and down from the intermediate boom 8 as shown in FIGS. It has become.

Reference numerals 24, 24, ... Show stays slidably held by the holders 22B of the brackets 22. The stays 24 are formed from a small-diameter pipe material with a predetermined length and are provided on the upper end side which is the tip end side. An anchoring ring 24A for anchoring the master rope 25 is provided. Further, each stay 24 is formed with a pair of pin holes 24B and 24C at predetermined intervals in the vertical direction.
Positioning pins 26 are selectively attached to B and 24C. The positioning pins 26 are mounted in the lower pin holes 24C when the stays 24 are projected upward from the intermediate boom 8 as shown in FIG.
Is positioned on each holder 22B at the projecting position shown in FIG.

Further, when lowering each stay 24 to the storage position shown in FIG. 8, each positioning pin 26 is pulled out from each pin hole 24C, and each stay 24 is lowered into the intermediate boom 8 by its own weight. Each positioning pin 26 is mounted in each pin hole 24B. Then, at this time, each positioning pin 26 is engaged with the lower end side of each holder 22B to hold each stay 24 at the storage position. On the other hand, the master rope 25 is inserted into the mooring ring 24A of the intermediate stay 24 among the stays 24 shown in FIGS. 7 and 8, and both ends thereof are connected to the mooring rings of the stays 24 on both sides via the fasteners 25A and 25A. It is worn (hanged).

Reference numeral 27 denotes an upper plate of the intermediate boom 8 which is a bridge plate bridged between the front and rear connecting pipes 17, 17. The bridge plate 27 is detachable for an operator to walk on the intermediate boom 8. It is provided for the convenience of disassembling and assembling the crane boom assembly 6 as described later. Here, as shown in FIG. 4, the intermediate boom 8 has a height dimension H of 2 to 3 m, and the work on the bridge plate 27 is a work at a high place. Therefore, the worker hooks a lifeline (not shown) on the master line 25 when climbing on the bridge 27 so as to ensure safety in high-place work.

In the prior art thus constructed, the crane boom assembly 6 has a total length of 10 m or more, and therefore, when the crane boom assembly 6 is transported to the work site, the intermediate boom 8 and the upper boom 9 are transported in a disassembled state. I am trying. At the work site, the intermediate boom 8 and the upper boom 9 are assembled before the crane work as shown in FIGS.

In this case, first, with each stay 24 provided on each intermediate boom 8 stored in the storage position shown in FIG. 8, the pendant ropes 15 are placed on each intermediate boom 8 as shown in FIG. Keep it. Then, in this state, the intermediate boom 8 is lifted by a small auxiliary crane (not shown) via the hook 28, the wire 29, etc., and is placed at a desired position.

Next, in a state where the intermediate boom 8 is grounded on the site, each stay 24 is raised to the extended position shown in FIG.
As shown in FIG. 6, each stay 24 is projected onto the intermediate boom 8 at a predetermined height, and a bridge 27 is bridged over the intermediate boom 8. An operator who climbs the bridge 27 attaches a lifeline. It is hooked on the main rope 25 so that the subsequent assembling work can be performed safely. Then, in this state, as shown in FIG. 4, the next intermediate boom 8 is hoisted via the hook 28 and the wire 29 of the auxiliary crane, and is transferred to the position of the intermediate boom 8 which was previously grounded. At this time, the connecting fitting 21 of the next intermediate boom 8 is inserted into the connecting fitting 20 of the previous intermediate boom 8 from the direction of arrow A,
In the inserted state, both are integrally connected with a connecting pin.

In this case, the connecting fittings 20 and 21 located on the lower side in FIG. 4 can be pin-joined by working from the ground. However, the upper coupling fittings 20, 21
The connecting work of the intermediate boom 8 (the bridge 2
7) It is necessary for the worker to climb up and hook the life rope on the master rope 25 so that the connecting fittings 20 and 21 are securely joined by the connecting pins. Even in a state in which the two intermediate booms 8 and 8 are connected, each stay 24 is attached to each stay 24 as shown in FIG.
As shown in FIG. 3, the main rope 25 is set to the extended position so that the life rope can be hooked, and then the next intermediate boom 8 is connected in the same manner as described above.

Next, as shown in FIG. 5, with the upper boom 9 connected to the tip side of the intermediate boom 8, these assemblies are hoisted by the hooks 28 of the auxiliary crane and attached to the upper swing body 2 in advance. It is transferred to the tip side of the lower boom 7, and the connecting metal fittings 21 (20) provided on the base end side of the intermediate boom 8 are inserted into the connecting metal fittings 20 (21) of the lower boom 7 to connect them with a connecting pin. . Also, the pendant ropes 15 placed on the respective intermediate booms 8 are connected to each other by metal fittings or the like. And the work at this time is also the middle boom 8
The safety rope of the assembling work is secured by hooking the life rope on the master rope 25 protruding above each stay 24. Also, when the crane boom assembly 6 is disassembled again after the crane work is completed, the procedure is similar to that at the time of assembling described above. When the disassembling / assembling work is completed, the intermediate boom 8
Each stay 24 is stored in the storage position illustrated in FIG.

[0019]

By the way, in the above-mentioned prior art, in order to project the master rope 25 on each intermediate boom 8, each stay in which the master rope 25 is connected to the mooring ring 24A on the upper end side is connected. 24 is slidably provided on the intermediate boom 8 via the brackets 22. The stays 24 are formed with pin holes 24B and 24C at predetermined intervals on the upper and lower sides thereof, and the pin holes 24B and 24C are respectively positioned. By selectively mounting the pins 26, the stays 24 are positioned by manually sliding them to the extended position shown in FIG. 7 and the storage position shown in FIG.

Therefore, in the prior art, when disassembling and assembling the crane boom assembly 6 at the site,
The worker climbs on the intermediate boom 8 and pulls out the positioning pins 26 from the stays 24 at the storage position shown in FIG. 8, for example, and pulls the stays 24 upward so as to project from the intermediate boom 8. The pin holes 24 of each stay 24 are positioned to position the stay 24 in the projecting position shown in FIG.
Since it is necessary to attach each positioning pin 26 to C, a great amount of labor and time are required for the work of overhanging and storing each stay 24 from the intermediate boom 8, and the workability is very poor. There is.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention allows each stay for extending the master rope from the intermediate boom to be easily slid between the storage position and the extension position. The purpose of the present invention is to provide a crane boom assembly capable of greatly improving workability during disassembly and assembly.

[0022]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a lower boom attached to a crane body, an upper boom to which a sheave for a hoisting rope is attached on the tip side, and an upper boom. In a crane boom assembly comprising an intermediate boom detachably provided between the lower boom and the lower boom, the intermediate boom is separated from the intermediate boom in the length direction of the intermediate boom, and is orthogonal to the length direction via brackets. A plurality of stays slidably held in the direction
The main rope provided on the tip side of each stay and inserted between the stays and the base end side of each stay, one end side being a fixed end fixed to the intermediate boom, the other end side A cord is formed as a free end, and by pulling the free end of the cord, the stays are projected outward from the inside of the intermediate boom.

[0023]

With the above construction, when the master rope is to be extended onto the intermediate boom prior to the disassembling / assembling work of the crane boom assembly, if the free end side of the rope is pulled,
By the tension of the rope at this time, the stays slide outward through the brackets and project outward from the inside of the intermediate boom so that the master rope can be extended onto the intermediate boom.
Further, when the tensile force of the rope is released, each stay descends into the intermediate boom by its own weight, and each stay can be easily stored in the intermediate boom.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiments, the same components as those of the conventional technique shown in FIGS. 3 to 8 are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 31, 31, ... Show brackets attached to the upper connecting pipes 17, 17 and the reinforcing pipes 18, and each of the brackets 31 is the same as the brackets 22 described in the prior art. And holder 3
1B, and each metal fitting 31A is fastened to the middle portion in the length direction of the connecting pipe 17 or the reinforcing pipe 18 by a nut 32 or the like.

Reference numerals 33, 33, ... Show stays slidably held up and down by the holder 31B of each bracket 31, and each stay 33 is a stay 24 described in the prior art.
Although the master rope 25 is connected to the anchoring ring 33A on the upper end side in substantially the same manner as the above, the rope insertion ring 33 for inserting the rope 38 described later at the lower end of each stay 33 is provided.
B is fixed by welding or the like. Further, each stay 33 is formed with a pin hole 33C at a position separated from the rope insertion ring 33B by a predetermined dimension, and each positioning pin 26 is detachably attached to each pin hole 33C as in the prior art.

Reference numeral 34 denotes a stopper plate to which one end side of the rope 38 is hooked and fixed. The stopper plate 34 is fixed to the lower surface side of the connecting pipe 17 located on the left side in the figure by means such as welding and the bracket 31. It is installed at a position away from. Reference numeral 35 indicates another stopper plate to which the other end side of the rope is hooked. The stopper plate 35 is fixed to the lower surface side of the end portion of the frame pipe 16 at a position close to the connecting fitting 21 by means such as welding. .

Reference numeral 36 denotes a guide roller around which an intermediate portion of the rope 38 is wound. The guide roller 36 is attached to the lower surface side of the connecting pipe 17 located on the right side in the drawing via a mounting bracket 37 or the like, When each stay 33 is moved to the extended position shown in FIG. 1 and the storage position shown in FIG. 2, the rope 38 can be smoothly drawn out and put in.

38 is a rope insertion ring 3 of each stay 33.
3B shows a rope as a rope provided by being inserted into 3B,
The rope 38 is formed of a wire having a small diameter, a rope, or the like, and hanging parts 38A and 38B are provided on both ends thereof. The rope 38 has a hook 38A on one end hooked on a clasp 34 on the left side in the figure to become a fixed end, and a hook 38B on the other end becomes a free end, which is a pull rope on the upper swing body 2 side. (Not shown) or clasp 35 on the left side in the figure
Selectively hooked to. In addition, the midway portion of the rope 38 is wound around the guide roller 36 about one turn and then
Alternatively, it is routed as shown in FIG.

The crane boom assembly according to this embodiment has the above-mentioned structure, and its basic operation is not different from that of the prior art.

Therefore, the operation of projecting and storing the master rope 25, which is a feature of this embodiment, will be described.

First, when the master rope 25 and each stay 33 are extended on the intermediate boom 8 as shown in FIG. 1 at the time of disassembling and assembling the intermediate boom 8, etc., the hanging tool 38B provided on the free end side of the rope 38 is used. Connect to the end of the pull rope.
Then, the base end side of this pulling rope is driven by the hoisting drum 5 of the upper swing body 2 (see FIG. 3) or an auxiliary drum (not shown), and the hanging tool 38B side of the rope 38 is indicated by the arrow in FIG. The tension of the rope 38 is increased by pulling in the direction B shown. As a result, each stay 33 slides upward in the holder 31B of each bracket 31.
The projecting position shown in (3) is projected onto the intermediate boom 8 and the master rope 25 is projected to a predetermined height position.

Next, in this state, the pin hole 3 of each stay 33 is formed.
Each positioning pin 26 is mounted in 3C, and each stay 33 is positioned at the projecting position shown in FIG. As a result, even after the tension on the rope 38 is released, it is possible to reliably prevent the stays 33 from inadvertently dropping into the intermediate boom 8 due to their own weight or the like. In this state, if the disassembling and assembling work of the intermediate boom 8 and the like illustrated in FIGS. 4 and 5 is performed, the lifeline can be securely hooked to the master rope 25 at a predetermined height position during this work, and the lifeline work can be performed. The safety of can be secured.

Further, when the disassembling and assembling work of the intermediate boom 8 and the like is completed, each positioning pin 26 is pulled out from the pin hole 33C of each stay 33 and the tension on the rope 38 is released. 33 descends into the holder 31B of each bracket 31 by its own weight,
Each stay 33 can be placed in the storage position shown in FIG. 2 and stored in the intermediate boom 8. Then, at this time, if the hook 38B of the rope 38 is hooked on the stopper 35 located on the right side in FIG. 2, the rope 38 can be used for the rope insertion ring of each stay 33 when the intermediate boom 8 is transported. It is possible to reliably prevent the rope 38 from being disengaged and the rope 38 from being lost.

Thus, according to this embodiment, each stay 3
Provide the rope insertion ring 33B on the lower end side of 3, respectively,
One end side of the rope 38 inserted through each rope insertion ring 33B is hooked on the stopper 34 of the intermediate boom 8, and the other end side is pulled by the hoisting drum 5 of the upper swing body 2 or an auxiliary drum. From the above, each stay 33 is automatically stretched from the retracted position shown in FIG. 2 to the extended position shown in FIG. 1 only by applying tension to the other end of the rope 38 in the direction of arrow B in FIG. The stay 33 and the main rope 25 can be easily extended and stored.

Therefore, in the present embodiment, the work of overhanging each stay 33 and the main rope 25 from the intermediate boom 8 and storing them can be easily performed by applying tension to the rope 38, which is a conventional technique. As described above, it is possible to significantly improve the overall workability without spending extra labor and time for the work of projecting the master rope 25.

In the above embodiment, the stoppers 34, 35 are used.
It has been described that the guide roller 36 is provided on the lower surface side of the connecting pipe 17 and the frame pipe 16 and the guide roller 36 is attached to the lower surface side of the other connecting pipe 17 via the mounting bracket 37. May be attached to the tightening metal fittings 31A of each bracket 31 or the like, or may be attached to an appropriate position of the intermediate boom 8. In addition, the guide roller 36
As for the above, the intermediate boom 8 may be attached at a proper position.

Further, in the above-described embodiment, the pin holes 33C are formed in the stays 33, and the positioning pins 26 are mounted in the pin holes 33C to position the stays 33 at the projecting position. However, the present invention is not limited to this, and each stay 33 may be held at the extended position shown in FIG. 1 by, for example, hooking the hook 38B of the rope 38 to a predetermined portion of the intermediate boom 8. Good.

Further, in the above-mentioned embodiment, the crawler type crane has been described as an example, but the present invention is not limited to this,
For example, it can be applied to a tower crane or the like.

[0040]

As described in detail above, according to the present invention, a plurality of stays for extending the master rope are provided slidably on the intermediate boom via the brackets, and the bases of the stays are provided. By fixing one end side of the rope inserted through the end side to the intermediate boom and pulling the free end on the other end side,
Since each stay is configured to project from the intermediate boom,
By simply applying tension to the free ends of the ropes, each stay and main rope can be easily extended from the middle boom, greatly improving the overall workability and ensuring safety during work. It is possible to save labor in disassembling and assembling the crane boom assembly.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an intermediate boom and stays for a main rope according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view similar to FIG. 1, showing a state in which each stay is stored in an intermediate boom.

FIG. 3 is an overall view showing a crawler type crane according to the related art.

4 is an explanatory view showing an assembled state of each intermediate boom shown in FIG. 3. FIG.

FIG. 5 is an explanatory view showing a state where an intermediate boom having an upper boom attached thereto is attached to a lower boom.

FIG. 6 is a perspective view of an intermediate boom.

7 is an enlarged cross-sectional view taken along line VII-VII in FIG.

FIG. 8 is a cross-sectional view similar to FIG. 7, showing a state in which each stay is stored in the intermediate boom.

[Explanation of symbols]

 1 Lower Traveling Body 2 Upper Revolving Body (Crane Main Body) 6 Crane Boom Assembly 7 Lower Boom 8 Middle Boom 9 Upper Boom 10 Hoisting Rope 11 Sheave 13 Depression Rope 15 Pendant Rope 16 Frame Pipe 17 Connecting Pipe 18 Reinforcement Pipe 25 Parent Rope 31 Bracket 33 Stay 34, 35 Clasp 36 Guide roller 38 Rope (cord) 38A, 38B Hanger

Claims (1)

[Claims] 1. A lower boom attached to a crane main body, an upper boom to which a sheave for a hoisting rope is attached at a tip side, and an intermediate boom detachably provided between the upper boom and the lower boom. In the crane boom assembly, the intermediate boom is provided with a plurality of stays spaced apart in the longitudinal direction of the intermediate boom and slidably held via brackets in a direction orthogonal to the longitudinal direction.
The main rope provided on the tip side of each stay and inserted between the stays and the base end side of each stay, one end side being a fixed end fixed to the intermediate boom, the other end side A crane boom assembly, characterized in that a rope which is a free end is provided, and each stay is projected outward from the inside of the intermediate boom by pulling the free end of the rope.