JPH10316366A - Luffing jib assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luffing jib assembling method which facilitates positioning of mutual connecting positions of partial jibs. SOLUTION: The luffing jib has a base assembly including a base jib section 5 which is connected to the tip of an telescopic boom 4, a first mast 8a and a second mast 8b which support the luffing jib at an optional derricking angle. When the partial jibs of a middle jib section 6 are connected to the base jib section 5, by connecting the backs of these jibs to each other, and pulling up the base jib section 5 using a wire rope 10 which is stretched between a first mast 8a and the base jib section 5, the partial jibs which intend to rock regarding their backs as supporting points, are forcibly linearly hung down and connected by a connecting means such that their sections are faced each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for assembling a luffing jib.

[0002]

2. Description of the Related Art As is well known, there is a luffing jib as a telescopic boom type jib used for unloading or unloading work at a high head or a remote position. The luffing jib is, for example, a base jib attached to the tip of a boom mounted on a truck crane, and a plurality of split jib and a sheave for suspending a hook block at the tip of the split jib according to working conditions with respect to the base jib. It is configured by connecting the mounted top jib. The split jib is configured such that an intermediate jib section is formed between the base jib and the top jib by being connected to a plurality of jib.Lattice jib which can achieve weight reduction compared to the number of connection stages in such an intermediate jib section is frequently used. The longitudinal ends of the lattice gibs are connected to each other. As a configuration for connection, a lug-shaped portion facing each other is formed on one of the longitudinal ends of the lattice jib, and a piece formed on the other side in the longitudinal direction is inserted into this lug-shaped portion, and the lug is inserted. There is a configuration in which a pin is inserted into an insertion hole formed in each of the shape portion and the piece portion (for example, JP-A-7-69585).

Incidentally, when assembling a luffing jib, the present applicant has proposed an assembling method called an upright assembly method which can reduce the ground space required for assembling (for example, the prior application of the present application). No. 2,524,141). This assembling method is a method in which the split jib is connected while being sequentially suspended from the end of the boom while extending the telescopic boom. FIG. 11 is a diagram for explaining the above-described vertical assembly method. In FIG. 11, a jib support 62 for supporting a luffing jib is attached to a tip end of a telescopic boom 61 mounted on a truck crane 60. The jib support 62 includes
The base end of the base divided jib 63 forming the base jib section is pin-connected. On the jib support 62, first and second masts 64, 65 for supporting the luffing jib at an arbitrary angle are swingably supported at a predetermined angle, and the first and second masts 64, 65 are mutually connected. Bendable tension rod 66 connected between its tips
Can be interlocked via. Both ends of a tension rod P for raising and lowering the luffing jib are attached between the tip of the top split jib 70 forming the top jib section and the first mast 64, and the truck crane is attached to the tip of the second mast 65. One end of a tension rope 67 which is a traction means constituted by a main rope or the like extended from a main winch on the 60 side is connected. A third mast 68 used to raise the first and second masts 64 and 65 is attached to the upper end of the jib support 62. A tension rope 67 and a sub-rope are attached to the tip of the third mast 68. A roller for hanging around is rotatably supported.

[0004] A crane with a roughing jib having the above configuration as a part of the main part is assembled by the following procedure. First, a jib support 62 and a base split jib 63 are respectively pin-connected to the tip of the telescopic boom 61 at the work site, and the base split jib 63 is connected to the telescopic boom 61.
Is suspended by extension and raising operations. FIG.
Shows this state. In this state, one end of the intermediate divided jib 69 forming the intermediate jib section is pin-connected to the front end of the base divided jib 63 on the back side. When the rear surface of the intermediate split jib 69 and the rear surface of the base split jib 63 are connected by pins, the intermediate split jib 69 is suspended by the extension and raising operations of the telescopic boom 61, and the intermediate split jib is divided into the abdominal surface of the base split jib 63. The abdominal surface of the jib 69 is pinned. The intermediate division jib 69 is prepared in the number of stages according to the work content, and when all the intermediate division jib 69 are connected by repeating the above-described suspension, the top jib is placed at the tip of the most advanced intermediate division jib 69. As shown in FIG. 12, the top divided jib 70 forming a section is pin-connected to the back and the abdominal surface of the suspended middle divided jib 69. One end of the tension rod P extended from the first mast 64 is fixed to the tip of the top split jib 70, and a sheave for hanging a sub-rope is supported. FIG. 12 shows a state before the base division jib 63, the intermediate division jib 69, and the top division jib 70 are sequentially connected to form a luffing jib. In this state, the tension rope fixed to the second mast 65 is shown. The second mast 65 is pulled by the tow 67.
Then, the first mast 64 is caused via the tension rod 66, and the tension rod P fixed to the tip of the first mast 64 and the top split jib 70 is pulled. As shown by the dashed line, it is shaken to raise the luffing jib.

[0005]

By the way, when assembling the luffing jib by the above-described vertical assembly method, the back of the divided jib to be connected in a suspended state is pin-connected, and then the extension and retraction operation of the telescopic boom 61 is performed. Is required to connect the abdominal surfaces of the divided jib. For this reason, alignment of the connection position between the back surface and the abdominal surface of the suspended divided jib is performed. As illustrated in FIG. 11, the suspended divided jib has the rear surface connected earlier. Since it can swing as a fulcrum, it does not form a straight line due to a change in the position of the center of gravity at the time of suspension, making it difficult to align the connecting positions of the abdominal surfaces. Therefore, in order to align the connection positions of the abdominal surfaces of the divided jib, an operation is required by an operator to swing the divided jib so that the connected positions of the abdominal surfaces coincide. However, since such an operation is a work that enters under the telescopic boom 61, the jib support 62
Alternatively, if the connection between the divided jibs is insufficient, there is a risk that a fall accident may occur. Further, since the work is required every time the connection of the divided jib is repeated, the assembling workability is deteriorated.

Particularly, when the top divided jib 70 is hung on the ground with the middle divided jib 69 connected to the plurality of intermediate divided jib 69, the length of the divided jib assembled on the ground increases. In addition, the amount of swing with the back as a fulcrum also increases. For this reason, since the weight of the divided jib to which the back surface is connected also becomes large, the operation force for matching the connection position of the abdominal surface becomes large, and the workability is further deteriorated.

On the other hand, the top split jib 70 forming the top jib section has one end of a tension rod P extended from the tip of the first mast 64 detachably attached to the tip thereof by a pin connection. By pulling, the luffing jib can be maintained at an arbitrary undulation angle. However, the tension rod P is moved from the first mast 64 to the top split jib 7.
Since the length to reach 0 is predetermined, there are the following problems when standing up depending on the length of the luffing jib with respect to the telescopic boom. FIG. 13 is a diagram for explaining the above problem. In FIG.
0 tension rod (hereinafter, for convenience,
The top jib tension rod P1) has a length similar to that of a tension rod (hereinafter, for convenience, referred to as an intermediate jib tension rod P2) mounted on another divided jib (in this case, the intermediate divided jib 69). It is predetermined. For this reason, the top jib tension rod P1
When the upper jib 70 is connected to the intermediate jib tension rod P2, even if the top split jib 70 tries to rotate in a direction in which the abdominal surfaces come into contact with the back surface as a fulcrum, the rotation is hindered. That is, in FIG. 13, when the top jib tension rod P1 pin-connected to the tip of the top split jib 70 is lifted at the free end as shown by the dashed line and connected to the tip of the intermediate jib tension rod P2, The back surface of the split jib 70 has the tension rods P1, P2.
The movement is restricted by the. For this reason, when the middle split jib 69 is lifted and the top split jib 70 tries to rotate downward with the back surface connected to the middle split jib 69 as a fulcrum, the top split jib 70 has a top jib tension rod. The same phenomenon occurs that is pulled up by P1. As a result, the top divided jib 70 is prevented from rotating downward, and the intermediate divided jib 6 is prevented from rotating.
9 cannot move toward the abdomen. Therefore, when rotating the top split jib 70, the top split jib 7
0, the connection between the top jib tension rod P1 and the top jib tension rod P1 is released, the rotation of the top division jib 70 is allowed, and the top jib tension rod P1 and the top division jib P1 are re-entered when the abdominal surface of the jib 70 contacts the abdominal surface of the intermediate division jib 69. Redoing the connection with is done in actual work.

As shown in FIGS. 13 and 14, for example, as shown in FIGS. 13 and 14, the work of disconnecting and reconnecting the top divided jib 70 and the top jib tension rod P1 is carried out by suspending the top divided jib 70 from the length. If the split jib to be connected to the split jib is short and the length of the luffing jib is shorter than the telescopic boom 61, the tension rod P extended from the first mast 64 is substantially vertical. Since the tip of the top split jib 70 is located near the tip of the tension rod P, the connecting operation can be performed relatively easily. However, FIG.
For example, as shown in FIG.
If the luffing jib is longer than 1 and a part of the luffing jib can be assembled while lying on the ground (as shown in FIG. 7 used in the description of this embodiment), the top split jib 70 is If the connection with the top jib tension rod P1 is released, the entirety of the tension rod P tends to hang down, so that the top jib tension rod P1 located at the tip end side of the tension rod P moves away from the top split jib 70. Therefore, when the top jib tension rod P1 is to be connected to the top split jib 70 again, the top jib tension rod P1 is aligned with the connection position of the top split jib 70 while pulling the tension rod P. Become. However, such an operation is easily affected by the tension of the tension rod P, so that the labor required for the positioning is increased and an extremely difficult operation is forced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of assembling a luffing jib in which the positions of the connecting positions of the divided jib can be easily adjusted in view of the above-described problems in assembling the conventional crane with a luffing jib.

Another object of the present invention is to provide an assembling method capable of improving workability when assembling a luffing jib longer than a telescopic boom.

[0011]

In order to achieve this object, according to the first aspect of the present invention, the divided jib is connected while being suspended from the end of the boom while extending and raising the telescopic boom. A method of assembling a luffing jib by sequentially connecting a base jib section and an intermediate jib section or a top jib section,
A jib base member detachably attached to the distal end of the telescopic boom, a base jib section whose base end is supported by the jib base member and which can be raised and lowered, and a base end supported near the up and down support position of the base jib section And
A base assembly including first and second masts having rollers supported on the same axis at a swinging end, and a connecting member connecting the swinging ends of the first and second masts; At the opposing end of the divided jib constituting the section, the joint is formed by swinging with the back side connecting means and the back side connecting means, which are located on the back side and support the divided jib so that it can bend in the vertical plane, as a fulcrum. An abdominal surface connecting means capable of connecting the abdominal surface when the divided jibs are in a straight line; a tension means connected to the first mast and the tip of the top jib section; and a tip of the second mast And a pulling means for pulling a distal end of the retractable boom toward the telescopic boom side, and a base jib section of the base assembly with respect to a distal end of the telescopic boom via the jib base. The attachment down, a first step of connecting the traction means to the distal end of the second mast, said first
A wire rope of a predetermined length is connected to the tip of the mast and a position near the tip of the base jib section of the base assembly, and the base jib section is linked with the upright operation of the first and second masts. A second step of swinging the constituting jib forward from the suspended state,
The extension and extension operations of the telescopic boom connect the back of the end of the divided jib that forms the intermediate jib section to the tip of the suspended base jib section via the back side connection means, and By connecting the abdominal surface of the divided jib through the connecting means, the back of the end of the suspended divided jib between the suspended divided jib group and the remaining divided jib group lying on the ground and A third step of connecting the back side of the end of the divided jib lying on the ground via a back side connecting means, and the split jib whose back sides are connected to each other via the back side connecting means; The telescopic boom is suspended by extension and raising operations, and in this state, the base jib section is swung forward in conjunction with the raising and lowering operations of the first and second masts by the operation of the traction means. And a fifth step of connecting the abdominal surfaces of the ends of the divided jib with each other by the abdominal surface-side connecting means after the fourth step. By repeating the fifth to fifth steps, the intermediate jib section is formed by connecting the divided jib of the number of stages according to the work content, and the top jib section connected to the end of the first mast and the end of the intermediate jib section is formed. It is characterized in that the tension member is connected to the tip of the divided jib to be formed.

According to a second aspect of the present invention, in the method of assembling the luffing jib according to the first aspect, in the third step, the divided jib group lying on the ground reaches the divided jib located at the forefront. The back surface and the abdomen are connected by the back side connection means and the abdomen side connection means, respectively.

[0013] The invention according to claim 3 is the invention according to claim 1 or 2.
In the method for assembling a luffing jib as described above, the tension means connected to the first mast and the tip of the top jib section has an end located on the top jib section side and extends from the intermediate jib section side. It is characterized in that a portion connected to the tension member is made expandable and contractible.

[0014]

According to the first aspect of the present invention, in the second step, a wire rope having a predetermined length is connected to the distal end of the first mast and a position near the distal end of the base jib section of the base assembly, and Since the divided jib that constitutes the section is swinging forward from the suspended state of the first and second masts from the suspended state, the rear side becomes the fulcrum. Even if the user tries to separate the abdominal surfaces, the abdominal surfaces are easily aligned by being forcibly pulled by the wire rope.

According to the second aspect of the present invention, since the divided jib groups lying on the ground have their back and abdominal surfaces connected to each other, the number of extension and raising operations of the telescopic boom can be reduced. Moreover, even in this case, when the suspended divided jib and the divided jib lying on the ground are connected to each other on the back surface and lifted, the wire rope is forcibly pulled up and the posture is adjusted in a straight line. .

According to the third aspect of the present invention, the tension means can be extended and contracted when swinging with the back surface as a fulcrum with respect to the suspended divided jib, so that the jib is restricted by the length of the tension means. It can swing without having to. Therefore, it is not necessary to release the connection between the top jib section and the tension means.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a diagram showing a main part of an entire configuration of a roughing jib to which an assembling method according to the present invention is applied, in a state before being assembled and raised by a vertical assembly method. In FIG. 1, a luffing jib 1 includes a bogie 2, a swivel 3 mounted on the bogie 2 so as to be horizontally rotatable, a telescopic boom 4 mounted on the swivel 3 so as to be able to undulate in a vertical plane, and a boom. A base jib section 5, an intermediate jib section 6, and a top jib section 7, which are continuously connected to the tip with a luffing jib mounting base 9 provided at the tip and forming a jib base, and these jib sections 5, 6 , 7 at an arbitrary undulation angle. For each of the above jib sections, a divided jib of unit length is used,
Among them, the divided jib that forms the base jib section 5
It is pin-coupled to a luffing jib mounting base 9 provided at the end of the telescopic boom 4 and is swingably supported. The divided jib forming the intermediate jib section 6 has a number of steps corresponding to the work content. The top jib section 7 is further pin-connected to a divided jib located at the tip of the intermediate jib section 6.

The support device 8 includes first and second masts 8a and 8b provided with swing fulcrums in the vicinity of the undulating support position of the base jib section 5. These first and second masts 8a and 8b are provided so as to be interlocked by a bendable tension rod 11 which is a connecting member connected between the distal ends thereof. The base jib section 5, the luffing jib mounting base 9, the first and second masts 8a and 8b of the support device 8, and the tension rod 11 as a connecting member are configured as a base assembly in the luffing jib 1.

Between the tip of the first mast 8a and the tip of the top jib section 7, a tension rod 12 in which a wire and a rod are combined is arranged so that the tips are connected to each other. A tension rod 13 with a tension rope that is extended from a winch mounted on the swivel 3 is connected to the tip. further,
Between the tip of the first mast 8a and a position near the tip of the base jib section 5, a stay rope 10 made of a wire rope of a predetermined length is connected.

The divided jib forming the intermediate jib section 6 connected to the base jib section 5 has the structure shown in FIG. In FIG. 2, a divided jib (reference numeral 5 for convenience)
0) means that the frame pipes 51 extend along the longitudinal direction of the jib section at the four corners, and extend vertically and horizontally so as to support each frame pipe 51 at the front and rear ends of the frame pipe 51 in the extension direction. Support pipe 52 and each frame pipe 51
The reinforcing pipe 53 has a lattice structure in between. One end of the frame pipe 51 in the extending direction is provided with an end portion 55 having a pair of lug pieces via a seat plate 54 fixed to each frame pipe 51.
The other end of the extension direction 1 is provided with a receiving portion 56 formed of a piece that can be fitted into the end portion 55 via the same seat plate 54 as described above. The end portion 55 is formed with an insertion hole 55A penetrating the lug piece, and the insertion hole 55A has
An engaging means 9 which is an example of a connecting means described later is provided so as to be detachably opposed to each other.

The engaging means 9, which is an example of the connecting means, is provided on the support pipe 52 at the rear side corresponding to the upper surface side of the divided jib 50 and the lower surface side of the divided jib 50 in FIG. Are respectively arranged and supported on the abdominal surface side, and constitute the back side connecting means and the abdominal surface connecting means. The engagement means 9 is driven by the hydraulic cylinder 9 </ b> A fixed to the end 55 to control the end 5.
5 is controlled, and the configuration for that is shown in FIG. In FIG. 3, an engagement means 9 includes a piston 9B which can reciprocate in a hydraulic cylinder 9A.
A piston 9B is integrated with one end in the axial direction, and a plunger 9D having an engagement pin 9C at the other end in the axial direction, which is engageable with and disengageable from the insertion hole 55A of the end portion 55, is engaged with the hydraulic cylinder 9A. A coil spring 9E is provided between the pin 9C and the coil spring 9E to give a habit of always protruding the engagement pin 9C from the hydraulic cylinder 9A. In the present embodiment, as the forward stroke of the plunger 9D, the engaging pin 9C passes through the space between the lug pieces of the end portion 55 and the insertion hole 55A.
, And the outer surface thereof is a stroke exposed to the outside. Oil passages 9F, 9 for reciprocating the piston 9B with the piston 9B interposed therebetween are provided in the hydraulic cylinder 9A.
G is connected, and among these oil passages 9F and 9G, the oil passage 9F is a forward movement oil passage of the piston 9B, and the oil passage 9G is a backward movement oil passage of the piston 9B. Also, the engagement pin 9C
Are colored so that they can be easily identified.

The oil is supplied to the oil passages 9F and 9G by piping arranged in the divided jib 50. In FIG. 2, the configuration of the above-mentioned piping is described as follows. Hydraulic cylinder 9A
In addition to the piping for, the oil supply path for independently operating the hydraulic cylinders 9A disposed on the rear side and the ventral side of the divided jib 50 can be selected, and on the rear side and the ventral side, In the left and right hydraulic cylinders 9A, the forward oil passages (corresponding to the oil passages 9F) and the backward oil passages (corresponding to the oil passages 9G) of the piston 9B are arranged in parallel with each other, and the left and right hydraulic cylinders 9A are arranged.
Inside, the piston 9B can perform the operation in the same direction. For this reason, in the divided jib 50, a pair of main oil passages 14 for feeding oil to the oil passages 9F and 9G,
15 is extended along one of the frame pipes 51, and one of its ends, that is, the end located on the hydraulic cylinder 9A side is connectable to the joint member 16, and the other end is connected to the other end. A member 17 is attached. Note that FIG.
In, the pipes are shown to protrude from the divided jib 50, but this is for the purpose of clarifying the piping path, and in reality, it is not possible that the pipes are grouped in the divided jib 50. Needless to say.

The joint member 16 has oil supply paths to the hydraulic cylinders 9A located on the back side and the abdominal side of the split jib 50, and one of the oil supply paths is selected and connected to the main oil paths 14 and 15. Connection (not shown)
Is provided. The connection of the main oil passages 14 and 15 to the joint member 16 is not shown in detail, but is performed by engaging one of the ends of the main oil passages 14 and 15 and the couplers provided on the joint member 16 with each other. The couplers have a structure capable of being disengaged from each other, and when the couplers are disengaged, oil does not leak due to an internal seal structure. Such a structure is used for the main oil passage 14,
The same applies to the connection member 17 attached to the other end of the end 15, and the connection member 17 forms one of the couplers. The connecting member 17 can communicate with an oil feed pipe extending from an oil supply device (not shown) prepared on the ground, separately from a connection position of the divided jib 50 when the luffing jib 1 is assembled.

When a plurality of divided jib 50 are assembled on the ground and the divided jib groups are suspended together, the main oil passages 14 and 15 are removed from the joint member 16 as necessary, and The hydraulic cylinder 9A of the divided jib 50 to be connected by connecting the main oil passages 14, 15 of the divided jib to be assembled via the connecting member 17
It is also possible to supply pressure oil to the pump.

The luffing jib 1 having the above configuration is assembled by the following procedure. (1) First Step In this step, while the base jib section 5 of the base assembly is connected to the tip of the telescopic boom 4, the turntable 3 is attached to the tip of the second mast 8 b of the base assembly. The tension rod 13 with the tension rope pulled out from the winch is connected. FIG. 4 is a view showing the state of the distal end of the telescopic boom 4 for explaining the first step. In FIG. 4, the distal end of the telescopic boom 4 is positioned at the base end of the base jib section 5,
The base jib section 5 is connected via a luffing jib mounting base 9 connected to its tip. Second
The end of the tension rod 13 extended from the winch is connected to the tip of the mast 8b.

(2) Second Step In this step, the stay rope 10 is connected between the front end of the first mast 8a and the position near the front end of the base jib section 5 of the base assembly, and the first and second masts are connected. 8a, 8
In conjunction with the raising operation of b, the divided jib constituting the base jib section 5 is swung forward from the suspended state. FIG. 5 is a diagram for explaining the second step.
In the figure, a stay rope 10 extending from the tip of the first mast 8a is connected to an upper position near the tip of the base jib section 5. In this state, the first and second masts 8 are extended through extension and raising operations of the telescopic boom 4.
When a and 8b are raised, the base jib section 5 is lifted by the extension of the stay rope 10.
For this reason, the distal end portion of the base jib section 5 that is about to hang down from the base end as a fulcrum is lifted up by the stay rope 10 and thus swayed forward. In addition, in FIG. 5, the code | symbol S has shown the sub rope for suspended loads.

(3) Third Step In this step, the front end of the base jib section 5 suspended by the extension and extension operations of the telescopic boom 4 is interposed via the engaging means 9 serving as the back side connecting means. The rear surfaces of the divided jib of the jib section 6 are connected, and the abdominal surfaces of the divided jib of the intermediate jib section 6 are connected by engaging means 9 serving as abdominal surface connecting means. At this time, the suspended divided jib group and the remaining divided jib group lying on the ground are the back of the end of the suspended divided jib and the end of the divided jib lying on the ground. Are connected to each other via an engagement means 9 serving as a back side connection means. FIG.
Shows a state in which the process shifts from the second step to the third step. In the same figure, the divided jib forming the intermediate jib section 6 connected to the tip of the base jib section 5 is lying on the ground. By connecting the remaining divided jib (for convenience, a jib indicated by reference numeral 50 'in FIG. 5), an intermediate jib section 6 having a divided jib of the number of stages according to the work content is constituted. For this reason, on the ground, the remaining divided jib 50 'for constituting the intermediate jib section 6 is arranged, and is suspended from the base end of the divided jib 50' on the ground side so that one of the intermediate jib sections 6 is suspended. The front ends of the divided jib are aligned with each other, and the rear surfaces of the divided jib are connected by the engagement means 9.

(4) Fourth Step In this step, the divided jib whose back sides are connected to each other is suspended by lifting the telescopic boom 4 by extending and raising the telescopic boom 4, and in this state, the first and second masts are suspended. The base jib section 5 is swung forward in conjunction with the upright movements of 8a and 8b, and the divided jib connected to the base jib section 5 are made straight. FIG. 6 is a view for explaining this step. In FIG. 6A, a divided jib lifted from the ground (for convenience, indicated by reference numeral 50 ').
Is suspended in conjunction with the forward swing of the base jib section 5. First and second masts 8 in this case
The erecting of a and 8b is performed by winding up the tension rope 13 connected to the tip of the second mast 8b with a winch. The base jib section 5 is swung forward in conjunction with the extension and raising operations of the telescopic boom 4 and the erecting of the first and second masts 8a, 8b. As it is raised clockwise, the base jib section 5
The divided jib forming a part of the intermediate jib section 6 connected to the second jib moves in the same direction. For this reason, the divided jib 50 ′ lying on the ground, which is the remaining part of the intermediate jib section 6, is positioned higher than the divided jib even if the divided jib 50 ′ is inclined due to a change in the position of the center of gravity when the back side is the fulcrum. Match the inclination of the split jib 50 '. As a result, FIG.
As shown in (B), the divided jib 50 'that is lifted from a state of lying on the ground is aligned with the divided jib positioned above it. As a result, the abdominal surface of the divided jib 50 ′ lifted from the ground faces the abdominal surface of the upper divided jib, and the end portion 55 (FIG.
(See FIG. 2) and the receiving portion 56 (see FIG. 2).

(5) Fifth Step In this step, the divided jibs whose abdominal surfaces have come into contact with each other in the fourth step are connected to each other by the engaging means 9 serving as the abdominal surface connecting means. The operation of the engagement means 9 on the back side and the abdomen side is obtained by controlling the operation of the hydraulic cylinder 9A by selecting the above-described piping path.

The above steps are repeated according to the number of divided jib connected to the intermediate jib section 6. The divided jib forming the top jib section 7 is connected to the tip of the intermediate jib section 6, and the top jib is further connected. The tension rod 12 is connected between the tip of the section 7 and the first mast 8a. As means for connecting the rear and abdominal surfaces of the divided jib of the base jib section 5, the intermediate jib section 6, and the top jib section 7, a manual pin connection may be used instead of the above-described engagement means. It is.

The tension rod 12 connected between the top end of the top jib section 7 and the first mast 8a can be separately mounted for each divided jib that forms each jib section except the base jib section 5, and can be connected. , The tension rod 12 configured to be connected,
It is extended toward the tip of the top jib section 7.

On the other hand, in the second step, the divided jib group lying on the ground includes not only the single divided jib as described above but also a plurality of divided jib on the ground to connect the divided jib. Some may form part of the jib section 6 and the top jib section 7. FIG. 7 shows an example of such a divided jib group. In this example, the length of the luffing jib 1 is longer than that of the telescopic boom 4. In this case, the connection of the divided jib group lying on the ground has been completed by the engagement means 9 whose back and abdomen form respective connection means. In FIG. 7, when connecting the divided jib group on the ground to the suspended jib group suspended, first, as in the case described above, first, the base end of the divided jib group lying on the ground Is connected to the rear surface of the tip of the suspended divided jib group. Thereafter, the extension and raising operations of the telescopic boom 4 are performed, so that the divided jib group on the ground side is lifted to be straight, and when the abdominal surfaces are joined to each other, the engagement forming the connecting means on the abdominal surface is performed. The abdominal surface is connected via means 9.

When the divided jib groups shown in FIG. 7 are connected to each other, similarly to the above-described example, the base jib section 5 is connected.
Intermediate jib section 6 connected to and suspended from
When the divided jib group is swung forward,
The base jib section 5 is pulled up. For this reason, the divided jib group that is mothed on the ground is
When the base end side is lifted by the extension and raising operations of the rope, the divided jib group already suspended
Since 0 is forcibly raised in the clockwise direction in the figure, the difference in the opening angle between the connected ends is sharply reduced, the posture is adjusted in a straight line, and the abdominal surfaces are easily opposed to each other.

The tension rod 12 extending from the first mast 8a is connected to a rod member provided for each divided jib of the jib section excluding the base jib section forming the intermediate jib section 6 by connecting the top jib section. 7, one end of which is connected by a top jib section 7. In this embodiment,
The tension rod provided in the top jib section 7 is configured to be extendable and retractable. 8 and 9
Is a diagram showing the relationship between the tension rod (shown by reference numeral 12 'for convenience) and the divided jib (shown by reference numeral 50A) forming the top jib section 7. In the drawing, the tension rod 12' Split jib 50A
Are provided in a pair in the width direction of the divided jib 50A. 8 and 9, FIGS. 2 and 3
The members having the same configuration as those shown in FIG. The tension rod 12 'is, as shown in FIG.
A plate member 12A having a bracket 12B pivotally supported at one longitudinal end by the split jib 50A;
2A, and a holder member 12C that slidably supports the plate member 12A.

In FIG. 10, the plate member 12A has a pin insertion hole 1 near the bracket 12B in the longitudinal direction.
2D and a long hole 12E are formed along the longitudinal direction, and a sheave 12K for hanging an auxiliary rope for assisting contraction when contracting the tension rod 12 ′ is rotatably supported on the bracket 12B. . The holder member 12C includes a plate member 12A inserted therein.
Is provided with a slide portion 12C1 slidably supporting the pin insertion hole 12D formed in the plate member 12A and the slide portion 12C1.
And pin insertion holes 12F and 12G that are open at an interval (L) from the first hole 12E to one end in the longitudinal direction of the long hole 12E. One end of a rod member 12H is fixed to the holder member 12C at an end opposite to the installation position of the slide portion 12C1 in the longitudinal direction.
Is provided with a connection bracket 12J for connecting to a tension rod 12 extending from an adjacent divided jib.

The tension rod 12 'is pivotally supported on the split jib 50A via the bracket 12B of the plate member 12A. The holder member 12C includes a sliding portion 12C1.
The plate member 12A is inserted into the
By inserting a pin into the pin insertion hole 12G facing the long hole 12E on the side, the plate member 12A is prevented from coming off. Of the pin insertion holes of the holder member 12C, the pins are always inserted into the above-described pin insertion holes 12G, but the insertion state is selected for another pin insertion hole 12F. That is, the pin insertion hole 12
When the pin is not inserted through F, the plate member 12A can slide as shown by an arrow M in the holder member 12C using the elongated hole 12E and the pin fitted therein as a guide portion. On the other hand, when the pin is inserted into the pin insertion hole 12F, the sliding operation of the plate member 12A can be prevented. That is, the pin insertion hole 1
Since the pin can be inserted into the 2F when the position of the pin insertion hole 12F coincides with the position of the pin insertion hole 12D on the plate member 12A side, when the pin is inserted in this state, the sliding of the plate member 12A is performed. Movement is regulated. In the latter case, the tension rod 12 'is in a contracted state, the total length is minimized, and the plate member 12A and the holder member 12C are integrated. When a pin inserted in the pin insertion hole 12D of the plate member 12A and the pin insertion hole 12F of the holder member 12C is pulled out, the length of the tension rod 12 'increases in accordance with the sliding amount of the plate member 12A.

The tension rod 12 'having such a configuration is maintained in a contracted state until the rear side of the split jib 50A is connected. That is, the pins are inserted into the pin insertion holes 12F of the holder member 12C, and the sliding of the plate member 12A is regulated. This prevents interference with the divided jib that is connected so that the plate member 12A is not carelessly extended. On the other hand, when connecting the abdominal surface of the top jib section 7 by suspending the top jib section 7 after the rear surface is connected, the pin insertion holes 12 of the plate member 12A are required before the connection work.
The pin is pulled out from the pin insertion hole 12F facing D. When the pin is pulled out from the pin insertion hole 12F, the sliding amount of the plate member 12A according to the length guided by the long hole 12E and the pin inserted therein is obtained. Therefore, the top jib section 7
When trying to rotate around the back surface as a fulcrum, the plate member 12A of the tension rod 12 'is held by the holder in accordance with the rotation of the tip of the top jib section 7 even if the tension rod 12' is still connected to the back surface. Member 12
The top jib section 7 can be rotated without being hindered until the abdominal surface faces the upper divided jib without being hindered. According to such a configuration, unlike the case where the length of the tension rod from the connection position of the tension rods to the tip of the top jib section 7 is defined, the tension rod 12 ′ of the top jib section 7 extends. Therefore, the rotation of the top jib section 7 is not hindered. Thereby, it becomes easy to adjust the posture of the top jib section 7 in a straight line with respect to the other jib sections, and the abdominal surfaces can be easily opposed to each other. When the connecting of the abdominal surfaces is completed by the engaging means 9 constituting the abdominal surface connecting means when the abdominal surfaces contact each other, the top jib section 7
The tension rod 12 is integrated with the plate member 12A by contracting the holder member 12C and inserting a pin into the pin insertion hole 12F.

According to the structure of the tension rod 12 'as described above, the plate member 12'A of the tension rod 12' is always connected to the top jib section 7. It is not necessary to remove the tension rod from the top jib section 7 each time the abdominal surfaces are brought into contact. Thus, regardless of the length of the luffing jib, the work of reconnecting the tension rod and the top jib section can be omitted, so that the workability during assembly can be improved.

[0039]

As described above, according to the first aspect of the present invention, in the second step, the predetermined length is set between the front end of the first mast and the position near the front end of the base jib section of the base assembly. The wire ropes are connected to each other, and the divided jib that constitutes the base jib section is swung forward in interlocking with the first and second masts in the suspended state, so that the back side is the fulcrum. By changing the position of the center of gravity,
By being forcibly pulled by the wire rope, the abdominal surfaces can be easily aligned so that the abdominal surfaces can be easily aligned.
This eliminates the need for the positioning work conventionally performed by the operator, and improves the workability during assembly, including the reduction of labor required for the work.

According to the second aspect of the present invention, since the divided jib groups lying on the ground have their back and abdominal surfaces connected to each other, the extension and extension operations of the telescopic boom can be performed in a small number of times. Moreover, even in this case, when the suspended divided jib and the divided jib lying on the ground are connected to each other on the back surface and lifted, the wire rope is forcibly pulled up and the posture is adjusted in a straight line. Therefore, irrespective of the size of the divided jib group to be connected, it is possible to improve the workability by saving the labor for connecting the abdominal surfaces.

According to the third aspect of the present invention, the tension means can extend and contract when swinging with the back surface as a fulcrum with respect to the suspended divided jib. It can swing without being restrained. Therefore, it is not necessary to release the connection between the top jib section and the tension means. Thus, the work of disconnecting and reconnecting the tension means is not required, so that the workability at the time of assembly can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main configuration of a luffing jib to which an assembling method according to the first to third aspects of the present invention is applied.

FIG. 2 is a perspective view for describing a configuration of a divided jib used for the roughing jib shown in FIG.

FIG. 3 is a cross-sectional view for explaining a configuration of an engagement means used for the split jib shown in FIG.

FIG. 4 is a view for explaining a first step in the method of assembling the luffing jib shown in FIG. 1;

FIG. 5 is a view for explaining second and third steps in the method of assembling the luffing jib shown in FIG. 1;

6A and 6B are views for explaining a fourth step in the method of assembling the luffing jib shown in FIG. 1, wherein FIG. 6A is a state where the telescopic boom is being extended and is being raised, and FIG. 6B is a state where the boom is being extended. , And the state after raising.

FIG. 7 is a view for explaining a fourth step in a case where the length of the luffing jib is longer than the length of the telescopic boom in the method of assembling the luffing jib shown in FIG. 1;

FIG. 8 is a plan view of the top jib section for explaining a configuration of a tension rod used for the top jib section.

FIG. 9 is a side view of a top jib section for explaining a configuration of the tension rod shown in FIG. 8;

FIG. 10 is a perspective view showing a configuration of a tension rod shown in FIG. 8;

FIG. 11 is a diagram for explaining an example of a method of assembling a luffing jib.

FIG. 12 is a diagram showing a state before raising the luffing jib by the assembling method shown in FIG. 11;

FIG. 13 is a diagram for explaining a tension rod pulling structure used for the top jib section.

FIG. 14 is a view showing a state before a raising jib provided with a top jib section to which the tension rod shown in FIG. 13 is attached is raised.

FIG. 15 is a diagram showing a state before raising the luffing jib longer than the telescopic boom.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 luffing jib 2 carriage 3 revolving base 4 telescopic boom 5 base jib section 6 intermediate jib section 7 top jib section 8 support device 8a first mast which is a component of support device 8b second mast which is another component of support device Reference Signs List 9 engaging means serving as connecting means used for the back and abdominal surfaces 10 staying rope located between first mast and base jib section 11 tension rod serving as connecting member for first and second masts 12 first mast and top Tension rod located between jib section 12 'Tension rod provided in top jib section 12'A Plate member 12'C Holder member 13 Tension rope serving as traction means

Claims (3)

[Claims] 1. A luffing jib in which a divided jib is connected while being suspended from the end of the boom while extending and raising the telescopic boom, and a base jib section and an intermediate jib section or a top jib section are connected in order. A jib base member removably attached to the distal end of the telescopic boom, a base jib section whose base end is supported by the jib base member and can be raised and lowered, and a base end of which is raised and lowered by the base jib section. First and second masts which are supported near the support position and which have rollers supported on the same axis at the swinging ends, and a connecting member which connects the swinging ends of the first and second masts. Base assembly, and at the opposite end of the divided jib that constitutes the intermediate jib section, And the back side connecting means for supporting the wings in a vertical plane so as to be able to bend in the vertical plane. Connecting means; tension means connected to the first mast and the tip of the top jib section; and traction means connected to the tip of the second mast and pulling the tip toward the telescopic boom. A first step of attaching a base jib section of the base assembly to the distal end of the telescopic boom via the jib base, and connecting the traction means to a distal end of the second mast; A wire rope of a predetermined length is connected to the distal end and a position near the distal end of the base jib section of the base assembly, and the first and second masts are erected. A second step of swinging the divided jib constituting the base jib section forward from the hung state in conjunction with the operation, and the base jib section in the hung state by extending and raising the telescopic boom. The rear end of the divided jib which forms the intermediate jib section is connected to the front end of the divided jib via the back side connecting means, and the abdominal surface of the divided jib is connected via the abdominal surface connecting means. A back side connecting means for connecting the back of the end of the divided jib suspended between the group and the remaining divided jib group lying on the ground to the back of the end of the divided jib lying on the ground. And a third step in which the backs are connected to each other via the back-side connecting means, and the divided jib whose backs are connected to each other is suspended by extending and raising the telescopic boom. A fourth step of swinging the base jib section forward to link the divided jib with each other by interlocking with the raising operation of the first and second masts by the operation of the traction means, and after the fourth step, A fifth step of connecting the abdominal surfaces of the ends of the divided jib with each other by the abdominal surface side connecting means, and repeating the first to fifth steps to connect the divided jib of a number of stages according to the work content, and A method of assembling a roughing jib, comprising an intermediate jib section, wherein the tension member is connected between a distal end of the first mast and a distal end of a split jib that forms a top jib section connected to the distal end of the intermediate jib section. 2. The method of assembling a luffing jib according to claim 1, wherein in the third step, the divided jib group lying on the ground reaches the rear-side connecting means until the divided jib located at the forefront is reached. A method for assembling a luffing jib, wherein the back surface and the abdomen surface are respectively connected by abdominal surface connection means. 3. The method of assembling a luffing jib according to claim 1, wherein the tension means connected to the first mast and a tip of the top jib section has an end located on the side of the top jib section pivotally. A method for assembling a luffing jib, wherein a portion connected to a tension member extended from the intermediate jib section is extendable.