JP6683086B2 - Mobile crane assembly method - Google Patents

Description

  The present invention relates to a method of assembling a mobile crane.

  BACKGROUND ART Conventionally, as a large-sized mobile crane, as described in, for example, Patent Documents 1 and 2, a traveling body, a revolving body rotatably provided on the traveling body, and a base end portion of the revolving body undulating. A boom supported rotatably (rotatably), a jib whose base end is supported on the tip of the boom so that it can be raised and lowered, and a base end which can be rotated on the tip of the boom or the base of the jib. It is known that a supported front strut and a rear strut whose base end is rotatably supported at the tip of the boom are known. In this case, the tip of the jib and the tip of the front strut are usually connected via a jib guy line, and the tip of the rear strut and the base end of the boom are joined via a strut guy line. Further, a first point sheave portion having a plurality of sheaves is provided at the tip portion of the front strut, and a second point sheave portion having a plurality of sheaves is provided at the tip portion of the rear strut. Then, a jib hoisting rope is hung between the sheave of the first point sheave part and the sheave of the second point sheave part, and this jib hoisting rope is provided by a jib hoisting winch provided at the base end of the boom or the revolving structure. By winding or unwinding, the distance between the first point sheave portion and the second point sheave portion is changed, and the jib is undulated.

In such a mobile crane, when assembling a front strut and a rear strut to a boom or jib which has fallen to the ground during assembly at a work site, the following procedures (1) to (5) are usually performed.
(1) First, attach the front end of the front strut to the tip of the boom or to the base of a jib previously attached to the end of the boom, and place the front strut on the ground directly or with the jib lying down. Deploy.
(2) Subsequently, the base end of the rear strut is attached to the tip of the boom, and the rear strut is placed on the front strut in a stacked state.
(3) In this state, the jib undulating rope is laid between the sheave of the first point sheave portion at the tip of the front strut and the sheave of the second point sheave portion at the tip of the rear strut.
(4) After that, by extending the jib undulating rope, between the first point sheave portion at the front end of the front strut and the second point sheave portion at the end of the rear strut (hereinafter referred to as "the point sheave portion of two struts" (Also referred to as "between"), the rear strut is erected and tilted backward with the auxiliary crane.
(5) In this state, the strut guy line is connected and the strut backstop is connected, and the strut backstop supports the rear strut in an upright state.

JP, 2010-76939, A JP2012-116607A

  However, of the above-mentioned conventional work procedures, in the procedure (4), the work of feeding the jib hoisting rope between the point sheave portions of the two struts with high precision and the work of tilting the rear strut backward by the auxiliary crane are performed. It had to be done at the same time, and the operator of the assembling crane and the operator of the auxiliary crane had to come together. If you are out of breath and the crane operator is operating faster to assemble, the jib hoisting rope may be overwound and the rear strut and jib hoisting rope may interfere. Conversely, if the operator of the auxiliary crane operates faster and the rear strut is tilted backward more quickly, the front strut will rise, and the supporting legs of the front strut will rise and contact the ground or the upper surface (rear surface) of the jib repeatedly. It may be damaged.

  The present invention has been made in view of the above point, and an object thereof is to perform high-precision feeding work of a jib hoisting rope between point sheave parts of two struts and rearward tilting work of a rear strut by an auxiliary crane at the same time. It is an object of the present invention to provide a method for assembling a mobile crane that can easily assemble the front strut and the rear strut to the boom or jib which has fallen down on the ground without performing the operation, and can contribute to the quick and easy operation.

  In order to solve the above-described problems, the present invention provides a traveling crane, a revolving structure rotatably provided on the traveling structure, and a base end portion of the revolving structure that is supported so as to be capable of undulating. A boom, a jib whose base end portion is supported by the front end portion of the boom so that the base end portion can be raised and lowered, and a front strut whose base end portion is rotatably supported by the tip end portion of the boom or the base end portion of the jib. A rear strut whose base end is rotatably supported by a tip end of the boom or a base end of the jib; and a plurality of sheaves detachably provided on the tip end of the front strut. Point sheave part, a second point sheave part having a plurality of sheaves provided at the tip part of the rear strut, the sheave of the first point sheave part, and the second point sheave part of the second point sheave part. Between sheaves Target that a hung around the jib hoist rope. And, when assembling the front strut and the rear strut to the boom or the jib which has fallen down to the ground as an assembling method of the mobile crane, the present invention firstly attaches the base end portion of the rear strut to the tip end portion of the boom. Alternatively, a step of rotatably attaching the rear strut to the base end portion of the jib and arranging the rear strut in a lying state, and subsequently, with respect to the second point sheave portion of the rear strut distal end portion, The first point sheave part separated from the tip part is arranged close to each other, and the jib hoisting rope is hung between the sheaves of these point sheave parts, and then the rear strut is raised by an auxiliary crane. After passing the state, fall back and connect the strut guy line and the strut backstop. And, subsequently, raising the rear strut forward with an auxiliary crane and supporting the rear strut in an upright state by the strut backstop, and then lifting the first point sheave portion with the auxiliary crane. While unrolling the jib undulating rope, moving to the tip of the front strut disposed directly on the ground or with the jib interposed, and then attaching the first point sheave portion to the tip of the front strut. And a process.

  With this configuration, the boom or jib that has fallen to the ground without simultaneously performing the high-precision feeding work of the jib hoisting rope between the point sheave parts of the two struts and the rearward tilting work of the rear strut using the auxiliary crane as in the conventional case. Since the front strut and the rear strut can be easily assembled to the, the work can be facilitated and speeded up.

  Here, after the step of supporting the rear strut in an upright state and before the first point sheave portion is lifted by an auxiliary crane, the base end portion of the front strut is attached to the tip end portion of the boom or the base end portion of the jib. It is preferable that the method further comprises a step of rotatably attaching to the section. In this method, the base end of the front strut is rotated to the tip of the boom or the base of the jib before the base of the rear strut is rotatably attached to the end of the boom or the base of the jib. It is movably mounted and can be applied even when it is unstable to put the rear strut on this front slat, and it has excellent versatility.

  According to the method for assembling the mobile crane of the present invention, the high-precision feeding operation of the jib hoisting rope between the point sheave portions of the two struts and the backward tilting operation of the rear strut by the auxiliary crane are simultaneously performed as in the conventional method. Since the front struts and the rear struts can be easily assembled to the boom or jib which has fallen down on the ground, it is possible to contribute to easy and speedy work.

FIG. 1 is a side view showing a state of a crawler crane to which a mobile crane assembling method according to an embodiment of the present invention is applied during a lifting operation. FIG. 2 is a side view showing one step for explaining a work procedure when assembling the front strut and the rear strut to the boom that has fallen to the ground when the crawler crane is assembled. FIG. 3 is a view corresponding to FIG. 2 showing another step. FIG. 4 is a view corresponding to FIG. 2 showing another step. FIG. 5 is a view corresponding to FIG. 2 showing another step. FIG. 6 is a view corresponding to FIG. 2 showing another step. FIG. 7 is a view corresponding to FIG. 2 showing another step. FIG. 8 is a view corresponding to FIG. 2 showing another step. FIG. 9 is a view corresponding to FIG. 2 showing another step.

  Hereinafter, an embodiment which is a mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a state of a crawler crane 1 as a mobile crane to which a mobile crane assembling method according to an embodiment of the present invention is applied, during a lifting operation. The crawler crane 1 includes a traveling body 2 traveling by crawlers, a revolving body 4 rotatably provided on the traveling body 2 with a revolving device 3 interposed therebetween, a boom 5 and a jib 6 as attachments. There is.

  The base end of the boom 5 is supported by the front part of the revolving structure 4 so as to be capable of undulating (rotating) around the boom foot pin 7. A base end portion of a jib 6 is supported on the tip end portion of the boom 5 so as to be capable of undulating around a jib foot pin 8.

  A jib point sheave 10, an auxiliary sheave 11, and an idler sheave 12 are provided at the tip of the jib 6, and a main hook 14 is suspended from the jib point sheave 10 via a main hoisting rope 13. One end of the main hoisting rope 13 is connected to the tip of the jib 6. The other end side of the main hoisting rope 13 is wired along the back side of the jib 6 and the back side of the boom 5 through the idler sheave 12, and as a hoisting winch provided in the front part of the revolving structure 4. It is wound around the winding winch 15. The main hook 14 is wound up or down by the forward and reverse rotations of the main winding winch 15.

  Further, an auxiliary hook 17 is hung from the auxiliary sheave 11 via an auxiliary winding rope 16. One end of the auxiliary winding rope 16 is connected to the auxiliary hook 17. The other end side of the auxiliary hoisting rope 16 is wired along the back side of the jib 6 and the back side of the boom 5 through the idler sheave 12, similarly to the other end side of the main hoisting rope 13, and the revolving structure 4 It is wound around a supplementary winch 18 provided at the front part of the. Then, the auxiliary hook 17 is wound up or down by the forward and reverse rotation of the auxiliary winding winch 18. The main hoisting rope 13 and the auxiliary hoisting rope 16 are wired through separate idler sheaves 12 provided at the tip of the jib 6.

  At the tip of the boom 5, the base end of the front strut 21 and the base end of the rear strut 22 are supported rotatably around pins, in addition to the base end of the jib 6. The front end of the front strut 21 and the front end of the jib 6 are connected via a jib guy line 23. The front end of the rear strut 22 and the base end of the boom 5 are connected via a strut guy line 24. In the case of the strut guy line 24, the jib guy line 23 and the strut guy line 24 are formed by connecting a plurality of link members, as shown in FIG.

  Further, a first point sheave portion 25 having a plurality of sheaves is separably provided at a front end portion of the front strut 21, and a second point sheave similarly having a plurality of sheaves is provided at a front end portion of the rear strut 22. A section 26 is provided. Here, as a configuration for providing the first point sheave portion 25 in a separable manner, although not shown, a plurality of sheaves, such as a spreader, and a support shaft that rotatably supports these sheaves are provided. The case that holds the support shaft may be unitized, and the unitized first point sheave portion may be detachably mounted via a mounting member or the like. In addition, a support shaft that rotatably supports a plurality of sheaves may be fitted in a notch groove or the like provided at the tip end portion of the front strut 21 and locked by a locking means without requiring a case. . The second point sheave portion 26 does not need to be separably provided at the tip of the rear strut 22 in carrying out the method for assembling the mobile crane according to the embodiment of the present invention, but it can be provided separably. Of course, it is good.

  A jib undulating rope 27 is hung around the sheave of the first point sheave portion 25 and the sheave of the second point sheave portion 26 a plurality of times. One end of the jib undulating rope 27 is connected to one of the first and second point sheave portions 25 and 26. The other end side of the jib undulating rope 27 is wired along the back side of the boom 5 from the second point sheave portion 26 (specifically, the sheave) through an idler sheave 28 provided on the back side of the tip portion of the boom 5. At the same time, it is wound around a jib undulating winch 29 provided at the base end of the boom 5. Then, by winding or unwinding the jib hoisting rope 27 with the jib hoisting winch 29, the distance between the first point sheave portion 25 and the second point sheave portion 26 is changed, and the jib 6 is hoisted. ing.

  The crawler crane 1 is further provided with a mast 31 having a base end portion undulatingly connected to a front portion of the revolving structure 4, a gantry 32 provided at a rear part of the revolving structure 4, and a rear portion of the revolving structure 4. A counterweight 33 and a counterweight trailer 35 connected to the rear end of the revolving structure 4 via a connecting arm 34 are provided.

  The tip of the mast 31 is connected to the tip of the boom 5 via a boom guy line 36 and a boom hoisting rope 37. The boom guy line 36 is formed by connecting a plurality of link members, and one end of the boom guy line 36 is joined to the tip portion of the boom 5. A boom spreader 38 is attached to the other end of the boom guy line 36, and a boom spreader 39 is attached to the tip of the mast 31, and a boom hoisting rope 37 is laid between the boom spreaders 38 and 39. . One end of the boom hoisting rope 37 is connected to either one of the boom spreaders 38 and 39. The other end of the boom hoisting rope 37 is wired along the back side of the mast 31 through a sheave 40 provided at the tip of the mast 31, and is wound around a boom hoisting winch 41 provided at the base end of the mast 31. Has been. The boom hoisting winch 41 winds or unwinds the boom hoisting rope 37 to change the distance between the boom spreaders 38 and 39, so that the boom 5 is hoisted. As the crawler crane 1, there is a type without the mast 31. In this case, there is no counterweight trailer 35, the gantry 32 is connected to the tip of the boom 5 by a guy line, and a pair of spreaders is provided between the gantry 32 and the boom 5, and a rope or the like is provided between the pair of spreaders. The boom 5 is undulated by expanding and contracting with the use of a rope, or a rope is hung between the gantry 32 and the revolving structure 4, and the gantry 32 is undulated by winding or unwinding the rope, and thus the boom 5 is undulated. It is designed to let you.

  The top of the gantry 32 is connected to the tip of the mast 31 via a mast guy line 43 and a mast erection rope 44. Further, the counterweight trailer 35 is supported from the tip end portion of the mast 31 via a suspension line 45. Each of the mast guy line 43 and the suspension line 45 is formed by connecting a plurality of link members.

  In FIG. 1, reference numeral 46 denotes a strut back stop. One end of the strut back stop 46 is connected to the tip of the boom 5 and the other end thereof is connected to the base end of the rear strut 22. The mounting angle of the rear strut 22 is maintained within a predetermined range.

  Next, a work procedure for assembling the front strut 21 and the rear strut 22 to the boom 5 that has fallen to the ground during the assembling of the crawler crane 1 at the work site will be described with reference to FIGS. 2 to 9.

  First, as shown in FIG. 2, the rear strut 22 is lifted by the auxiliary crane 50, the rear end of the rear strut 22 is brought close to the tip of the boom 5, and then the rear strut 22 is rotatably attached. Place it in a laid-down state. At this time, the strut guy line 24 is temporarily fixed to the upper surface of the rear strut 22 (the rear surface during the lifting operation) and the upper portion of the boom 5 (the rear surface during the lifting operation). It is separated into a stopped portion 24b. Further, one end of the strut backstop 46 is connected to the upper surface side of the rear strut 22, but the other end of the strut backstop 46 is held by a holding member 51 attached to the base end of the rear strut 22. There is.

  Subsequently, as shown in FIG. 3, the first point sheave portion 25 separated from the tip portion of the front strut 21 is separated by a predetermined distance from the second point sheave portion 26 at the tip portion of the rear strut 22 placed on the ground. They are placed close to each other on the ground, and the jib undulating rope 27 is laid between the sheaves of these point sheave portions 25, 26. At that time, not only the jib hoisting rope 27 is unwound from the jib hoisting winch 29, but also the jib hoisting rope 27 can be wound around by using a reeving device provided in the front part of the revolving structure 4 or the like to smoothly perform the hoisting work. And it can be done reliably. The predetermined distance is a distance suitable for winding the jib undulating rope 27 between the sheaves of the two point sheave portions 25, 26. Further, when the rear strut 22 is placed not directly on the ground but with the jib 6 or the front strut 21 interposed, the position of the first point sheave portion 25 is not limited to the ground, but the jib 6 or the front strut. You may arrange | position on the ground side, such as the upper surface side of the strut 21.

  After that, as shown in FIG. 4, the tip of the rear strut 22 is lifted by the auxiliary crane 50, and the rear strut 22 is tilted rearward (boom 5 side) via the standing state. At that time, the first point sheave portion 25 is left on the ground or moved from the ground to the base end side of the rear strut 22. For that purpose, it is necessary to pay out the jib hoisting rope 27 from the jib hoisting winch 29 in accordance with the rearward tilting of the rear strut 22, but the operation does not need to be performed with high accuracy and is relatively easy. be able to.

  When the rear strut 22 is tilted rearward, the portion 24a of the strut guy line 24 temporarily fixed to the rear strut 22 is removed from the rear strut 22, and one end (lower end) of the portion 24a is temporarily fastened to the boom 5. 24 is connected to one end of the portion 24b.

  Next, as shown in FIG. 5, the rear strut 22 is slightly raised forward by the auxiliary crane 50, the holding of the strut backstop 46 by the holding member 51 is released, and then the strut backstop 46 is connected to the tip portion of the boom 5. . The connection of the strut guy line 24 and the connection of the strut backstop 46 may be performed in the reverse order.

  Subsequently, as shown in FIG. 6, the rear strut 22 is raised further forward by the auxiliary crane 50, the strut backstop 46 is extended, and the strut backstop 46 supports the rear strut 22 in an upright state.

  Next, as shown in FIG. 7, the front strut 21 is lifted by the auxiliary crane 50, the base end portion of the front strut 21 is brought close to the tip end portion of the boom 5, and the front strut 21 is rotatably attached.

  Subsequently, as shown in FIG. 8, the auxiliary crane 50 lifts the first point sheave portion 25 from the ground and moves it to the tip portion of the front strut 21 directly arranged on the ground. At that time, it is necessary to pay out the jib hoisting rope 27 from the jib hoisting winch 29 in accordance with the moving operation, but the operation does not need to be performed with high accuracy and can be performed relatively easily.

  After that, as shown in FIG. 9, the first point sheave portion 25 is attached to the tip of the front strut 21 while the first crane sheave portion 25 is being lifted by the auxiliary crane 50.

  With the above, a series of operations for assembling the front strut 21 and the rear strut 22 to the boom 5 that has fallen to the ground during the assembly of the crawler crane 1 at the work site is completed.

  In the assembling method according to such a work procedure, as is conventional, the jib hoisting rope 27 is precisely fed out between the point sheave portions 25 and 26 of the two struts 21 and 22, and the rear strut 22 is tilted backward by the auxiliary crane 50. Since it is possible to easily assemble the front strut 21 and the rear strut 22 to the boom 5 that has fallen down on the ground without performing the work at the same time, it is possible to contribute to the ease and speed of the work.

  Particularly, in the case of the present embodiment, after the rear strut 22 is supported in the upright state and before the first point sheave portion 25 is lifted by the auxiliary crane 50, the front strut 21 is lifted by the auxiliary crane 50 and the base of the front strut 21 is lifted. An assembling method is adopted in which the end is rotatably attached to the tip of the boom 5. In this assembling method, the base end portion of the front strut 21 is rotatably attached to the tip end portion of the boom 5 before the base end portion of the rear strut 22 is rotatably attached to the tip end portion of the boom 5. It can be applied even when it is unstable to place the rear strut 22 on the strut 21, and is excellent in versatility.

  It should be noted that the present invention is not limited to the above-described embodiment, and includes various other forms. For example, in the above embodiment, the front strut 21 is lifted by the auxiliary crane 50 after the rear strut 22 is supported in the upright state and before the first point sheave portion 25 is lifted by the auxiliary crane 50. Although the rotatably attached to the front end of the boom 5, the present invention attaches the base end of the front strut 21 prior to rotatably attaching the base end of the rear strut 22 to the front end of the boom 5. Needless to say, the front strut 21 may be rotatably attached to the front end of the boom 5 and the rear strut 22 may be placed on the front strut 21.

  Further, in the above-described embodiment, the case where the present invention is applied to a mobile crane in which two struts, that is, the base end of the front strut 21 and the base end of the rear strut 22 are rotatably attached to the tip of the boom 5. Said. However, according to the present invention, the base end of the rear strut 22 is attached to the tip of the boom 5, and the base end of the front strut 21 is attached to the base end of the jib 6, or the base end of the jib 6 is attached. The present invention can also be applied to a mobile crane in which the base end of the front strut 21 and the base end of the rear strut 22 are rotatably attached to the respective parts. In this case, prior to the attachment of the front strut 21 or the rear strut 22, all or at least the base end of the jib 6 is attached to the tip of the boom 5, and the front strut 21 or the rear strut 22 is placed on the jib 6 placed on the ground. The base end of the front strut 21 or the rear end of the rear strut 22 may be attached to the base end of the jib 6 in the state of mounting. Further, when the front strut 21 and the rear strut 22 are integrally attached to the base end of the jib 6 through the structure, the two struts 21 and 22 are attached at the same time, and the rear strut 22 is laid down. Before arranging, the front strut 21 may be placed on the jib 6 placed on the ground, and the rear strut 22 may be laid down and arranged thereon. Further, when the two struts 21 and 22 are attached at the same time, first, the front struts 21 and the rear struts 22 may be integrated and then placed and attached on the jib 6 in that state.

  Further, in the above-described embodiment, the case where a so-called guy link formed by connecting a plurality of link members is used as the strut guy line 24 and other guy lines (that is, the jib guy line 23, the boom guy line 36, and the mast guy line 43) is described. However, the present invention can also be applied to the case where a wire rope or the like is used. In this case, when connecting the strut guy line with the auxiliary crane 50 tilting the rear strut 22 rearward, one end of the strut guy line is previously connected to the tip of the rear strut 22 and the rear strut 22 is tilted backward. This corresponds to connecting the other end of the strut guy line that hangs from the tip of the rear strut 22 in this state to the base end of the boom 5.

  In addition, the present invention can be applied not only to the crawler crane 1 as in the above-described embodiment but also to other mobile cranes such as a wheel crane and a truck crane. Further, the boom 5 is not limited to the one having the lattice structure as in the above-described embodiment, but may be one that can be expanded and contracted. Further, the mast 31, the front strut 21, and the rear strut 22 are not limited to the lattice structure, and may have a box structure.

1 crawler crane (mobile crane)
2 Traveling body 4 Revolving structure 5 Boom 6 Jib 21 Front strut 22 Rear strut 24 Strut guy line 25 First point sheave part 26 Second point sheave part 27 Jib undulation rope 29 Jib undulation winch 46 Strut backstop 50 Auxiliary crane

Claims (2)

A traveling body, a revolving body rotatably provided on the traveling body, a boom whose base end portion is supported by the revolving body so that the base end portion can be undulated, and a base end portion can be undulated at the tip end portion of the boom. A supported jib, a front strut whose base end is rotatably supported at the tip of the boom or the base end of the jib, and a base end at the tip of the boom or the base end of the jib A rotatably supported rear strut, a first point sheave portion having a plurality of sheaves that is separably provided at the tip portion of the front strut, and provided at the tip portion of the rear strut, A movement comprising a second point sheave portion having a plurality of sheaves, and a jib undulating rope wound between the sheave of the first point sheave portion and the sheave of the second point sheave portion. Type crane assembly A law,
When assembling the front strut and the rear strut to the boom or the jib which has fallen to the ground, first, the base end portion of the rear strut is rotatably attached to the tip end portion of the boom or the base end portion of the jib, Arranging the rear strut in a prone state,
Subsequently, the first point sheave part separated from the tip part of the front strut is arranged close to the second point sheave part of the rear strut tip part, and the sheaves of these point sheave parts are arranged between them. A step of winding the jib undulating rope,
Thereafter, a step of tilting the rear strut with an auxiliary crane backward through the standing state, and connecting the strut guy line and the strut backstop,
Subsequently, raising the rear strut forward with an auxiliary crane, and supporting the rear strut in an upright state by the strut backstop,
Then, hoisting the first point sheave part with an auxiliary crane, while feeding the jib hoisting rope, moving to the tip part of the front strut arranged directly on the ground or with the jib interposed,
After that, a step of attaching the first point sheave portion to the tip portion of the front strut is included.   After the step of supporting the rear strut in the upright state and before hoisting the first point sheave portion with the auxiliary crane, the base end portion of the front strut is rotated to the tip end portion of the boom or the base end portion of the jib. The method of assembling a mobile crane according to claim 1, further comprising a step of movably mounting.

Images