JP2002255478A - Luffing jib crane and method of assembling it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luffing jib crane which can be assembled in an embracing assembly method by providing a long jib, and assembled in an extension assembly method with no assembly space required. SOLUTION: This luffing jib crane, provided with a boom 2 and a jib constituted by a lower jib 3a rockably mounted in the boom 2, a plurality of added jibs 3b added to the lower jib 3a, and an upper jib mounted in the added jib 3b, can swivel the lower jib 3a so as to be folded in a lower side of the boom 2 and so as to extend on the extension of the boom 2. The luffing jib crane is provided with a rotary slide implement 10 as an accessory comprising a bracket 10a for mounting in a rear side end part of the added jib 3b and a roller 10c rotatably journaled to a bracket 10b axially mounted in this bracket 10a, so that the bracket 10b of this rotary slide implement 10 can be demountably mounted in the rear side end part of the added jib 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The invention of this application relates to a jib,
An invention relating to a luffing jib crane which can be arranged close to the lower side of a collapsed boom or to extend in front of the boom, and a method of assembling the luffing jib crane which is a kind of a method of using the luffing jib crane. It is.

[0002]

2. Description of the Related Art As a crane, a crane provided with a boom tiltably mounted on a traveling body traveling by a crawler or the like and a jib swingably mounted on the boom has been generally known. For this type of crane,
The jib is composed of a lower jib swingably attached to the boom, a plurality of joint jib added to the lower jib, and an upper jib attached to the last joint jib added to the lower jib, and the lower jib, Some cranes can be rocked to a large extent so that they can be swung to fold under the boom or to extend along the extension of the boom. It is called a jib crane.

[0003] The invention of this application is an improvement of the conventional technology related to luffing jib cranes so as to make assembly easier. Accordingly, an example of a conventional luffing jib crane will be described with reference to FIGS. FIG. 9 is a side view of a conventional luffing jib crane, showing a state in which a embracing type assembling method is performed. FIG. 9 is a view showing a state in which an extending type assembling method is performed. FIG.

In these figures, reference numeral 1 denotes a traveling body that travels by driving a crawler, 2 denotes a boom that is installed on the traveling body 1 so as to be tiltable, and 3 denotes a jib that is swingably attached to the boom 2. Reference numeral 3a denotes a lower jib which is swingably attached to the top of the boom 2 and forms a lower portion of the jib 3 (a lower portion when the jib 3 is raised). Reference numeral 3b denotes a connecting jib which is added to the lower jib 3a. The upper jib 4 attached to the last joint jib 3b added to the jib 3a and forming the upper part of the jib 3 (the upper part when the jib 3 is raised) is rotatable at the rear end of the upper jib 3c. The attached roller.

[0005] A plurality of joint jib 3b are provided, and an appropriate number of joint jib 3b can be added to the lower jib 3a according to the work content of the crane.
The upper jib 3c is attached to b to form a jib 3 having a desired length. The jib 3 is generally provided between the rear end of the lower jib 3a and the front end of the joint jib 3b, between the ends of the plurality of joint gibs 3b, and between the rear end of the joint jib 3b and the upper jib 3c. It is configured to be detachably connected to the front end with a jib connecting joint having the same structure. In this specification, the side of the jib 3a, 3b, 3c that is connected first toward the boom 2 is referred to as a front side, and the side that is connected later is referred to as a rear side.
Roller 4 uses a luffing jib crane as shown in FIGS.
When changing from the initial position of the crane assembly installed as shown in FIG. 0 to the normal position at the time of starting the crane operation, the jib 3 needs to be able to be raised while making contact with the ground and moving in the front-rear direction. Is essential.

Reference numeral 5 denotes a boom hoisting rope connected to the top of the boom 2 for raising and lowering the boom 2; 6a, a front jib mast swingably attached to the top of the boom 2;
Reference numeral 6b denotes a rear jib mast which is swingably attached to the top of the boom 2 in a state where the rearward tilting by a predetermined amount or more is disabled by a stopper (not shown).
7b is a rear jib mast pendant rope connected to the rear jib mast 6b and the lower part of the boom 2, and 8 is a jib hoist for rocking the jib 3 to undulate. It is a rope. Although not shown, the luffing jib crane has a hoisting rope for hanging a suspended load wound around a top of the boom 2 or the jib 3 via a pulley.

[0007] The boom hoisting rope 5 raises or lowers the boom 2 by being wound up or out by a boom hoisting winch (not shown) in the traveling body 1. The front jib mast 6a and the rear jib mast 6b respectively
A large number of jib hoisting rope sheaves (not shown) are attached at predetermined intervals in the left-right direction (the direction perpendicular to the paper surface). After attaching one end to the rear jib mast 6b, the jib hoisting rope 8 is wound around the front jib mast 6a and the rear jib mast 6b in multiple layers so as to reciprocate between the jib masts 6a and 6b via their sheaves. I have. Further, the other end of the jib hoisting rope 8 looped around in this manner is pulled down along the boom 2 and attached to a jib hoisting winch (not shown) installed at a lower portion of the boom 2. Accordingly, only the portion of the jib hoisting rope 8 looped between the jib masts 6a and 6b is shown in the figure.

The front jib mast 6a is swingably mounted, and the rear jib mast 6b is prevented from tilting forward by a pendant rope 7b for rear jib mast and prevented from tilting rearward by a stopper (not shown). When the jib mast is taken up by the jib hoisting winch, the front jib mast 6a swings toward the rear jib mast 6b, so that the jib 3 is pulled upward by the front jib mast pendant rope 7a and swings upward. Conversely, when the jib hoisting rope 8 is extended, the front jib mast 6a is swung so as to be separated from the rear jib mast 6b, so that the jib 3 can be swung downward and fall down.

In assembling the luffing jib crane constructed as described above, when assembling the jib 3 to the boom 2, the lower jib 3a, one or a plurality of joints are previously set at a position below the boom 2 that has been brought down to near the ground. Jib 3
b, after joining the upper jib 3c to complete the jib 3,
When the jib 3 is lifted by a separately prepared auxiliary crane and the lower jib 3a and the top of the boom 2 are connected and attached, as shown in FIG. Can be. After the initial process of assembling the crane, the method of assembling the luffing jib crane by displacing the boom 2 and the jib 3 to a position where the crane operation can be performed while sliding the roller 4 of the upper jib 3c is included. Called method.

[0010] As another method of assembling the jib 3, which is different from the embedment type assembling method, the boom 2 is tilted to near the ground, and the lower jib is extended on the top of the boom 2 so as to extend on the extension of the boom 2. There is a method in which 3a, one or a plurality of joining jib 3b and upper jib 3c are sequentially joined, and the jib 3 is arranged to extend forward of the boom 2 as shown in FIG. After the initial process of assembling the crane,
A method of assembling a luffing jib crane by displacing the boom 2 and the jib 3 to a position where crane work can be performed while sliding the roller 4 of the upper jib 3c is referred to as an extension type assembling method. This extension-type assembling method is easier to assemble than the embracing-type assembling method because the assembling operation can be performed on the ground, but requires a larger assembling space than the embracing-type assembling method.

[0011]

The luffing jib crane is used when building a low and wide building having a small floor area and a large floor area, such as a nursing home. Although no length is required, the jib 3 must be able to use a long jib for crane operations over a wide area. For this reason, it is necessary for the luffing jib crane to be provided with a long jib 3 so that it can be assembled when it is installed at a work site.

However, in the conventional luffing jib crane, when assembling it by the embracing type assembling method, as shown in FIG.
Can not be assembled. And boom 2
However, since it is not necessary to make the jib 3 so long, there is a limit even if the length of the jib 3 is made longer. On the other hand, when this is assembled by the extension type assembling method, as long as a large assembling space can be obtained, a long jib 3 can be provided and assembled. Requires a very large assembly space with depth. Therefore, especially when a long jib 3 has to be provided, it is extremely difficult to always secure the assembly space necessary for the assembly work in Japan based on land conditions.

[0013] The inventions of the present application have been made in view of the problems of the prior art described above, and the first technical problem of the invention of the present application is that even when a jib longer than the boom is provided, the embracing type can be used. An object of the present invention is to provide a luffing jib crane that can be assembled by an assembling method and that can be assembled by an extension-type assembling method without requiring an assembling space conventionally.

A second technical problem of the invention of the present application is to provide a method of assembling a luffing jib crane which can be assembled by a embracing type assembling method even when a jib longer than a boom is provided using such a luffing jib crane. It is in.

A third technical problem of the invention of the present application is to provide a method of assembling a luffing jib crane which can be assembled using such a luffing jib crane by an extension-type assembling method without requiring an assembling space. It is in.

[0016]

The first technical object is achieved by the invention of a luffing jib crane according to claim 1 of the present invention. In the present invention, the following object is achieved in order to achieve the technical object. The means shown in 1) was adopted.

1) A boom which is installed to be tiltable, a lower jib which is swingably attached to the boom, a plurality of joint gibs which are joined to the lower jib, and a last joint jib which is joined to the lower jib. A jib comprising an upper jib, wherein the lower jib can be swung so as to be folded below the boom or swung so as to extend on an extension of the boom. A rotating slide equipped with a bracket for attaching to the rear end of the bracket and a roller rotatably supported on the bracket is provided as an accessory, and the bracket of the rotary slide is attached to and detached from the rear end of the joint jib. So that it can be mounted as much as possible.

In the luffing jib crane of the present invention employing such means, when a jib longer than the boom is provided by the embracing type assembling method, the lower jib is swung so as to be folded under the boom and the boom is tilted. Position the lower jib beneath the boom that has been knocked down near the ground. Thereafter, add a suitable number of splicing jib to the lower jib as long as it fits comfortably under the boom, arrange these jib close to the lower side of the boom, and rotate and slide to the last splicing jib to be spliced. Attach the tool. Next, the lower jib and the joint jib are erected while sliding the rotary slide, and when it is erected, the rotary slide attached to the joint jib is removed. Here, when a jib of a desired length can be assembled without adding a new joining jib, the upper jib is attached to the joining jib from which the rotary slide has been removed.

If a jib of a desired length cannot be assembled unless a new splicing jib is added, a new splicing jib is connected to the splicing jib from which the rotary slide is removed, and a new splicing jib is connected. Attach the rotary slide to the jib, add the new joint jib by standing up while sliding the rotary slide, and remove the rotary slide attached to the raised joint jib. Then, after performing these steps an appropriate number of times until a jib of a desired length is assembled, finally, the upper jib is attached to the joint jib from which the rotary slide has been removed.

On the other hand, when assembling by the extension type assembling method in a case where an assembling space having a depth greater than the length of the boom plus the length of the jib cannot be obtained, the boom and the lower jib are operated so as to be close to the ground. After positioning the lower jib so as to extend in front of the fallen boom, add an appropriate number of joints to this lower jib considering the size of the assembly space, and rotate the sliding jib to the last joint to be added. Attach. Next, the lower jib and the joining jib are erected while sliding the rotary slider, and when the lower jib and the joint jib are erected, the rotary slider attached to the raised jib is removed. Hereinafter, the upper jib is attached to the joint jib from which the rotary sliding device has been finally removed through the same process as when assembling by the embracing type assembling method.

In the luffing jib crane of the present invention,
In particular, since a rotating slide that can be detachably attached to the rear end of the joint jib is provided as an accessory, it is possible to stand up while sliding the joint jib, and in the initial process of crane assembly Even when the upper jib having the rollers is not attached, the operation of raising the ground jib can be performed without any trouble. Therefore, it is possible to attach the upper jib to this joint jib with the joint jib raised so that it does not take up space, and it is also possible to add a new joint jib and attach the upper jib if necessary According to the luffing jib crane of the present invention, even when a jib longer than the boom is provided, it is possible to assemble by the embracing type assembling method, and it is possible to assemble by the elongate type assembling method without conventionally requiring an assembling space. it can.

The second technical problem is achieved by the first invention relating to a method for assembling a luffing jib crane according to claim 3 of the present invention.
In order to achieve the technical task, the following method 2) was adopted.

2) When assembling the luffing jib crane of the above 1), an initial step of arranging the lower jib and the connecting jib connected to the lower jib and having the rotary slide attached thereto in the vicinity of the lower side of the boom that has been tilted; A jib erecting step of erecting the lower jib and the joint jib while sliding the rotary slide, a rotary slide remover removing step of removing the rotary slide attached to the erect joint jib, and a rotary slide. A luffing jib crane is assembled through an upper jib attaching step of attaching the upper jib to the removed joint jib.

In the assembling method of the luffing jib crane according to the present invention, in the initial step of assembling the crane, unlike the related art, the connecting jib and the lower jib to which the rotary slide is attached without attaching the upper jib are provided on the lower side of the boom. Since the lower jib and the joining jib are erected while sliding the rotary slide in the jib erecting process, the jib is set on the lower side of the boom in a state in which the jib is shortened compared to the conventional jib and the lower jib and the joining are set. The jib can be raised without hindrance. Then, through the rotating jig removing step and the upper jib attaching step, the joining jib is removed so as to take up space, and the rotating jig is removed and the upper jib is attached to the joining jib, so that the assembly of the luffing jib crane of the present invention is performed. In the method, even when the luffing jib crane is provided with a jib longer than the boom, the luffing jib crane can be assembled by the embracing type assembling method.

The third technical object is achieved by a second invention relating to a method for assembling a luffing jib crane according to claim 4 of the present invention.
In order to achieve the technical task, the following method 3) was adopted.

3) When assembling the luffing jib crane of the above 1), an initial step of arranging the lower jib and the connecting jib connected to the lower jib and having the rotary slide attached thereto so as to extend in front of the folded boom. A jib erecting step of erecting the lower jib and the joint jib while sliding the rotary slide, a rotary slide remover removing step of removing the rotary slide attached to the erect joint jib, and a rotary slide. A luffing jib crane is assembled through an upper jib attaching step of attaching the upper jib to the removed joint jib.

In the method of assembling the luffing jib crane according to the present invention, in the initial step of assembling the crane, unlike the prior art, the connecting jib and the lower jib to which the rotary slide is attached without the upper jib are arranged in front of the boom. Since the lower jib and the joining jib are raised while sliding the rotary slide in the jib erecting process, the lower jib and the joining jib are set in front of the boom in a state where the jib is shortened as compared with the conventional case. Can be raised without hindrance. Then, in the same manner as the assembling method according to the first aspect of the invention, the connecting jib is removed so as to take up no space, and the upper sliding jig is removed by joining the upper sliding jib through the upper sliding jib mounting step from the rotating sliding tool removing step. Since the jig is attached to the jib, the luffing jib crane according to the present invention can be assembled by an extension-type assembling method without requiring an assembling space conventionally.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments showing how the invention of the luffing jib crane and the method of assembling the same according to the present application are actually embodied will be described below with reference to FIGS. The embodiments of these inventions will be clarified. FIG. 1 is a side view showing an embodiment of the invention of the luffing jib crane of the present application, showing an initial step of assembling when a embedment type assembling method is performed.
Is a view similar to FIG. 1 showing a jib erecting step, FIG. 3 is a view similar to FIG. 1 showing a step of removing a rotary slide, and FIG. 4 is a view similar to FIG. 1 showing a first stage of an upper jib attaching step. Figure 5 and Figure 5
FIG. 6 showing the second stage of the upper jib attaching process, similar to FIG.
FIG. 7 is a view similar to FIG. 1 showing a state at the time of completion of assembly, and FIG.
FIG. 8 is a side view showing an embodiment of the invention of the luffing jib crane of the present application, showing an initial step of assembling when performing the extension type assembling method. FIG. 8 is an embodiment of the invention of the luffing jib crane of the present application. FIG. 5 is a side view showing a joining jib adding step when carrying out the assembling-type and extending-type assembling methods. In these figures, the parts denoted by the same reference numerals as those in FIGS. 9 and 10 represent the same parts as those in both figures, and will not be described in detail.

The embodiment of the invention of the luffing jib crane of this application is similar to the conventional example shown in FIGS. 9 and 10, and a boom 2 is installed on a traveling body 1 so as to be tiltable, and a swinging part is provided on the top of the boom 2. Lower jib movably mounted 3
a, a plurality of joint gibs 3b added to the lower jib 3a
And a jib 3 composed of an upper jib 3c attached to a last joint jib 3c added to the lower jib 3a,
The lower jib 3a can be swung so as to be folded below the boom 2 or can be swung so as to extend on the extension line of the boom 2, which is the same as the conventional example. Also, a boom hoisting rope 5 for raising and lowering the boom 2
A front jib mast 6a swingably attached to the top of the boom 2, a rear jib mast 6b fixed to the top of the boom 2, pendant ropes 7a and 7b respectively connected to the two jib masts 6a and 6b, and both the jib masts. 6a,
And a jib hoisting rope 8 hung between 6b, so that the jib 3 can be swung by the jib hoisting rope 8,
This point is not different from the conventional example.

Therefore, the characteristic structure of the luffing jib crane of this embodiment will be described. The luffing jib crane is rotatably supported by brackets 10a, 10b and a bracket 10a to be attached to the rear end of the joining jib. Sliding device 1 provided with a set roller 10c
0 is provided as an accessory.
0b can be detachably attached to the rear end of the joining jib 3b. In the example shown here, since a plurality of rollers 10c are provided, even if the joint jib 3b is inclined, the plurality of rollers 10c are swung with respect to the joint jib 3b so as to make contact with the ground. Bracket 10
a and 10b are provided, and the bracket 10a is pivotally mounted on the bracket 10b at the location of 10d, but only a bracket for supporting the roller 10c is provided, and this bracket is directly connected to the joint jib 3b. It may be mounted swingably. When only one roller 10c is provided, the means for allowing the roller 10c to swing can be omitted.

The lower jib 3a, the plurality of joint jib 3b, and the upper jib 3c constituting the jib 3 are formed by arranging four long steel materials at four corners of a square so that their cross sections are square. It is configured to be framed in the longitudinal direction. Of these, the joint jib 3b is formed to have a prismatic shape, and the lower jib 3a and the upper jib 3c are tapered so that the shape as viewed from the side of the crane is substantially an isosceles triangle.
And, between the rear end of the lower jib 3a and the front end of the joint jib 3b, between the ends of the plurality of joint gibs 3b, the rear end of the joint jib 3b, and the front end of the upper jib 3c. Between, at the location of the steel material arranged at the four corners of the rectangular cross section,
Each is configured to be detachably connected by a jib connection joint having the same structure. Therefore, the plurality of joint jib 3b can be added to the lower jib 3a in any order.

The jib connecting joint includes concave joints provided at the rear ends of the lower jib 3a and the joint jib 3b, respectively.
It consists of convex joints respectively provided at the front ends of the joint jib 3b and the upper jib 3c, and the convex joints are fitted into the concave joints to be connected by being axially attached. A pair of jib connecting joints composed of such a concave joint and a convex joint are provided on the right side of the paper and the left side of the paper at two locations each in a direction perpendicular to the plane of the paper, and two jib connections on the right side of the paper are provided. The joints are pivotally mounted by joint pins 9a, respectively, and the two jib coupling couplings on the left side of the drawing are mounted by being pivotally mounted by joint pins 9b, respectively. Accordingly, as shown in FIG. 4, for example, the right sides of the joint jib 3b and the upper jib 3c are connected to the joint pin 9a.
When the two jib 3b and 3c are not connected by the joint pin 9b, the upper jib 3c is connected to the jib 3b and the joint pin 9a is used as a fulcrum, as shown in FIG. Can be rocked.

In connection with the structure and arrangement of the jib connecting joint as described above, the rotating slide 10 shown here is
The bracket 10b is also provided with a joint capable of connecting with the jib coupling joint at the rear end of the bracket j, and the bracket 10b can be detachably attached to the rear end of the joint jib 3b by both joints. ing. That is, the bracket 1
0b, like the upper jib 3c, is formed by framing four steel members so that the front end has a rectangular cross section.
A convex jib coupling joint which can be fitted into the concave jib coupling joint at the rear end of the joint jib 3b is provided at each steel material, and this convex joint is connected to the concave joint of the joint jib 3b. The two joints can be fitted and connected by joint pins 9a and 9b. Since the joint of the bracket 10b has the same structure as the jib coupling joint at the front end of the joint jib 3b and the upper jib 3c, a plurality of joint jib 3
Regardless of the order in which b is added, the rotary slide 10 can be attached to the joint jib 3b.

Although the three-dimensional shape of the bracket 10b is not explicitly shown in the drawing, it has a three-dimensional shape as if the upper jib 3c is significantly shortened in the longitudinal direction. That is,
The bracket 10b has a low isosceles triangular frame on both the front and back sides as viewed in a direction perpendicular to the plane of FIG. 2, and has a rectangular shape on both left and right sides when viewed parallel to the plane of FIG. Of the frame. The tops of the isosceles triangular frames on the front side and the back side are connected to each other by a rod 10d, and a bracket 10a for pivotally supporting a roller 10c is swingably attached to the rod 10d. . This luffing jib crane has the above features and a pendant rope 7a for the front jib mast.
Can be connected not only to the top of the upper jib 3c, but also to the rear end of the joint jib 3b when necessary.

Since this luffing jib crane employs the above-described means, when the jib 3 longer than the boom 2 is provided, when the assembling method is used to assemble the jib 3, the top of the boom 2 which is brought down near the ground is used. , The lower jib 3a positioned close to the lower side of the boom 2 is connected. Thereafter, as shown in FIG. 1, a suitable number of splices 3b are added to the lower jib 3a within a range where the jib 3b fits comfortably below the boom 2, and the jib 3a, 3b is held by the boom 2. And the rotary slide 10 is attached to the last joining jib 3b to be added. The rotary sliding device 10 may be attached to a predetermined joint jib 3b before the joint jib 3b is added, or the last joint jib 3b after the joint jib 3b is added.
You may make it attach to. After the joining jib 3b is added, as shown in FIG. 1, the front jib mast pendant rope 7a is connected to the rear end of the last added joining jib 3b. Thus, the initial process of assembling the crane is completed.

Next, a jib erecting step of raising and lowering the boom 2 and erecting the lower jib 3a and the joint jib 3b while sliding the rotary slide 10 is performed. Then, as shown in FIG. 2, when these gibs 3a, 3b are raised, a rotary sliding device removing step is performed, and as shown in FIG. 3, the rotary sliding device 10 attached to the joint jib 3b.
Remove. Next, an upper jib attaching step of attaching the upper jib 3c to the joint jib 3b from which the rotary slide 10 has been removed is performed. In this case, in the example shown here, the attachment of the upper jib 3c to the joint jib 3b is performed in two stages as described below.

First, as shown in FIG. 4, the upper jib 3c is laid on the ground with the jib connecting joint of the upper jib 3c facing upward, and the seam is connected to the jib connecting joint of the upper jib 3c. The two joints are pivotally attached to the jib coupling joint of the jib 3b with the joint pin 9a so as to be close to the joint on the right side of the joint jib 3b in the figure, whereby the upper jib 3c is pivotally connected about the joint pin 9a. I do. In this way, the connection process at the previous stage of the upper jib 3c is completed.

Next, by operating the lower jib 3a to swing upward and raising the joint jib 3b, the upper jib 3c is swung with the joint pin 9a as a fulcrum while the upper jib 3c is raised. To the end of the joining jib 3b. Next, the remaining jib connecting joints of the upper jib 3c and the joint jib 3b, that is, the joints on the left side in the drawing are axially connected by the joint pins 9b and connected.
Thus, the connecting process at the subsequent stage of the upper jib 3c is completed, and the upper jib attaching step for attaching the upper jib 3c to the joint jib 3b is completed. FIG. 5 shows a state in which the upper jib 3c has been attached to the joint jib 3b through the subsequent connecting process.

When the upper jib 3c is attached to the joint jib 3b by such a method, the upper jib 3c is connected to the ground in a state in which the upper jib 3c is supported by the ground with almost no support by human power in the connecting step before the upper jib 3c. It can be connected to one side of the joint jib 3b. Further, in the subsequent connecting step of the upper jib 3c, the end of the upper jib 3c can be brought close to the end of the joint jib 3b with almost no human power in the process of raising the joint jib 3b. . Then, while maintaining such a state favorable for the connection work of the upper jib 3c with little need for human power,
The upper jib 3c can be connected to the other side of the joint jib 3b, so that the work of mounting the upper jib 3c can be performed easily. Therefore, when performing the upper jib mounting step, the labor can be reduced and the step can be performed smoothly.

In such an upper jib attaching step, if possible, the upper jib 3c which has been connected to the joint jib 3b in advance and integrated is replaced with the joint jib 3b from which the rotary slide 10 is removed.
It can also be attached to. After the upper jib attaching step is completed, the front jib mast pendant rope 7a, which has been connected to the joint jib 3b, is replaced with the top of the upper jib 3c as shown in FIG. The luffing jib crane can be assembled by the embracing type assembling method through the above process.

In the above described method of assembling the luffing jib crane of the embracing type, unlike the prior art, in the initial step of assembling the crane, the connecting jib 10b to which the rotary slide 10 is attached and the lower jib are attached without attaching the upper jib 3c. 3
a is disposed below the boom 2 and the two jib 3a, 3b are raised while the rotary slide 10 is slid in the jib raising step. The lower jib 3a and the joint jib 3b can be raised without any trouble by being set on the lower side. Then, the connecting jib 3b is removed from the rotation sliding tool removing step through the upper jib attaching step.
With the rotary slide 10
Is removed and the upper jib 3c is attached to the joint jib 3b. Therefore, in this method of assembling the luffing jib crane, even when the luffing jib crane is provided with the jib 3 longer than the boom 2, it can be assembled by the embracing type assembling method.

On the other hand, in a case where an assembling space having a depth greater than the length of the boom 2 plus the length of the jib 3 cannot be obtained, when assembling by the extension type assembling method, the lower jib 3 is used.
The lower jib 3a is positioned in front of the boom 2 that has been tilted near the ground by swinging the a so as to extend on the extension of the boom 2 and tilting the boom 2. After a while, FIG.
As shown in the figure, the joining jib 3b is added to the lower jib 3a in consideration of the size of the assembling space, and is extended so as to extend in front of the boom in which the lower jib 3a and the joining jib 3b are tilted. The rotary slide 10 is attached to the last joint jib 3b. At that time, as shown in FIG. 7, the pendant rope 7a for the front jib mast is connected to the rear end of the joint jib 3b that was added last. Thus, the initial process of assembling the crane is completed.

Next, the boom 2 is raised and lowered, and a lower jib 3a and a joint jib 3b are erected while sliding the rotary sliding tool 10 to perform an upright jib raising process to raise these jib 3a and 3b. At this time, the luffing jib crane is in a state as shown in FIG. 3 similarly to the case where the jib erecting step is performed by the above-described embracing type assembling method. Can be assembled by the extension type assembling method.

In the method of assembling the luffing jib crane of the extension type, in the initial step of assembling the crane, unlike the related art, the joint jib 3b and the lower jib 3a to which the rotary slide 10 is attached without attaching the upper jib 3c. Since the jib 3 is disposed in front of the boom 2 and both the jib 3a and 3b are erected while sliding the rotary sliding tool 10 in the jib erecting step, the jib 3 is shortened in front of the boom 2 in the conventional state. Set to lower jib 3a and joint jib 3
b can be caused without any trouble. Then, as in the above-described embedment type assembling method, the rotary jig 3b is removed from the rotary jig 3b in a state where the joint jib 3b is raised so as not to take up space through the upper jib mounting step from the rotary slide jig removing step.
Since c is attached to the joint jib 3b, the luffing jib crane can be assembled by an extension-type assembling method without requiring an assembling space conventionally.

In the case of assembling the luffing jib crane by the embracing type or the extension type assembling method, in the example described above, the rotary sliding device removing step for removing the rotary sliding device 10 attached to the upright joint jib 3b is performed. Later, the upper jib 3c is immediately attached to the joint jib 3b. However, such a method may not be able to assemble the jib 3 having a desired length. In such a case, after the rotation sliding tool removing step is performed, as shown in FIG. 8, a new joining jib 3b is connected to the existing joining jib 3b from which the rotating sliding tool 10 has been removed, and a new joining jib 3b is formed. Then, the new joint jib 3b is added through the process of erecting the new joint jib 3b while sliding the rotary slide 10 by attaching the rotary slide jig 3b.

When the joining jib adding step of adding the new joining jib 3b is performed as described above, the new joining jib 3b is connected by connecting all the jib connecting joints before standing the new joining jib 3b. Although it may be completely attached to the existing joint jib 3b, in the example shown here, the joint jib 3 is attached similarly to the case where the upper jib 3c is attached to the joint jib 3b.
The attachment of the new joint jib 3b to b is performed in two stages. That is, first, as shown in FIG. 8, the front jib mast pendant rope 7 a is connected to the rear end of the existing joint jib 3 b that has been added last, and then the jib connecting joint of the new joint jib 3 b is connected. The joint jib 3b facing upward
The two joints 3b, 3b are brought close to the jib connecting joint of the existing joint jib 3b which is connected to the joint
By pivotally connecting with, it is swingably connected.

After completion of the preceding connection process,
By raising the existing joint jib 3b, the new joint jib 3b is swung while being raised to bring the end of the new joint jib 3b closer to the end of the existing joint jib 3b. The remaining jib connecting joints 3b, 3b are connected to each other by joint pins 9b to form a new joint jib 3b.
Is completely attached to the existing joint jib 3b, and the subsequent connecting process is completed.

In the example shown here, when the joining jib 3b is added in the joining jib adding step, a new joining jib 3b is added in two stages through the preceding connecting step and the following connecting step. Therefore, as in the case where the upper jib attaching step is performed in two stages, the labor can be reduced when the joint jib adding step is performed, and the step can be performed smoothly. In such a connecting jib adding step, if possible, a new connecting jib 3b previously connected and integrated into a plurality of pieces is added to the existing connecting jib 3b from which the rotary slide 10 has been removed. Can also.

In this joining jib adding step, a new joining jib 3
b, the rotary slide 10 attached to the joint jib 3b
After standing up, the rotating slide is removed by removing the rotating slide. Then, the joining jib adding step and the rotary sliding tool removing step are performed with a jib 3 having a desired length.
Is performed once or more suitable times until it is assembled, and the above-described upper jib mounting process is performed in the final stage, so that the rotary slide 10
The upper jib 3c is attached to the joint jib 3b from which the is removed.
In this way, if the upper jib attaching step is not performed immediately after the rotation sliding tool removing step is performed, the joint jib adding step or the rotating sliding tool removing step is performed at least once, and then the upper jib attaching step is performed. Even when a luffing jib crane needs to be provided with a specially long jib, the desired length can be attained by the embedment type or the extension type assembly method without the necessity of an unnecessarily long boom 2 or a large assembly space. Jib 3 can be assembled.

In the luffing jib crane described above, the rotary slide 10 which can be detachably attached to the rear end of the joint jib 3b is provided as an accessory, so that the joint jib 3b stands up while sliding. This makes it possible to perform the operation of raising the ground jib 3b without mounting the upper jib 3c having rollers in the initial process of assembling the crane. Therefore, the upper jib 3c is attached to the joining jib 3b in a state where the joining jib 3b is raised so as not to take up space, and further, if necessary, a new joining jib 3b is added and then the upper jib 3c is attached. According to the luffing jib crane, even when the jib 3 longer than the boom 2 is provided, the luffing jib crane can be assembled by the embracing-type assembling method, and the elongate-type assembling can be performed without requiring an assembling space. Can be assembled in any way. As a result, it is no longer necessary to install a boom 2 that is longer than necessary as in the prior art when used for building a low and wide building.

In this luffing jib crane, the plurality of joint jib 3b and the joint jib 3b and the lower jib 3a are detachably connected by a jib connecting joint having the same structure. A joint capable of connecting with the jib connecting joint at the side end is provided on the bracket 10b of the rotary sliding device 10, and the rotary sliding device 10 is connected by both joints.
Can be detachably attached to the rear end of the joint jib 3b.
Can be detachably attached to the joint jib 3b, the existing jib coupling joints for coupling the joint jib 3b to each other and the joint jib 3b to the lower jib 3c can be effectively utilized, and The jib 3b, 3c need not be provided with any special connecting means or processing for attaching the rotary sliding member 10. Further, the plurality of joint jib 3b are connected to the lower jib 3
The rotary slide 10 can be attached to the joint jib 3b regardless of the order in which the joints are added to the joint j.

[0052]

As is clear from the above description, the invention of the luffing jib crane of this application employs the means 1) described in the section of the means for solving the problems, and therefore the present invention is not limited thereto. For example, a luffing jib crane that can be assembled by a embracing type assembling method even when a jib longer than the boom is provided and that can be assembled by an extension type assembling method without requiring an assembling space conventionally is obtained. As a result, it is no longer necessary to install an unnecessarily long boom as in the prior art when used for building low and wide structures.

In the first invention of this application relating to a method of assembling a luffing jib crane, the means of 2) shown in the section of means for solving the problems is adopted, and therefore, according to the present invention, Even when a jib longer than the boom is provided by using a jib crane, a method of assembling a luffing jib crane that can be assembled by a embracing type assembling method is obtained. In the second invention of this application relating to a method of assembling a luffing jib crane, the means of 3) described in the section of the means for solving the problems is employed, and therefore, according to the present invention, a luffing jib crane is used. As a result, a luffing jib crane assembling method which can be assembled by an extension-type assembling method without requiring an assembling space is conventionally obtained.

When the invention of the luffing jib crane of this application is embodied, in particular, claim 2 of the claims is set forth.
If the rotary slide can be detachably attached to the joint jib, the existing jib connecting joint for connecting the joint jib and the joint jib and the lower jib is effective. These jib do not require any special connecting means or processing for attaching the rotary slide. In addition, even when a plurality of joint jib are added to the lower jib in any order, the rotary slide can be attached to the joint jib.

When the first invention and the second invention of this application relating to the method of assembling a luffing jib crane are embodied, in particular, if they are embodied as described in claim 5, When carrying out the upper jib attaching step of attaching the upper jib to the joint jib, the labor can be reduced and can be carried out smoothly. When embodying the first invention and the second invention of the present application relating to a method of assembling a luffing jib crane, particularly when embodied as described in claim 6, a luffing jib crane is used. Even when extra long jib must be provided, it is possible to assemble the jib of desired length by the embed type or extension type assembly method without needing an unnecessarily long boom or a large assembly space. it can.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the invention of a luffing jib crane according to the present application, showing an initial step of assembling when a embracing type assembling method is performed.

FIG. 2 is a view similar to FIG. 1 showing a jib erecting step.

FIG. 3 is a view similar to FIG. 1, illustrating a step of removing the rotary slide.

FIG. 4 is a view similar to FIG. 1 showing a first stage of an upper jib attaching process.

FIG. 5 is a view similar to FIG. 1, showing a second stage of the upper jib attaching process.

FIG. 6 is a view similar to FIG. 1, showing a state at the time of completion of assembly.

FIG. 7 is a side view showing an embodiment of the invention of the luffing jib crane of the present application, showing an initial step of assembling when the extension type assembling method is performed.

FIG. 8 is a side view showing an embodiment of the invention of the luffing jib crane according to the present application, and is a diagram showing a joining jib adding step when performing the embedment type and extension type assembly methods.

FIG. 9 is a side view of a conventional luffing jib crane, showing a state when a embracing type assembling method is performed.

FIG. 10 is a view similar to FIG. 9, showing a state when the extension type assembling method is performed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 2 Boom 3 Jib 3a Lower jib 3b Joint jib 3c Upper jib 4 Roller 5 Boom up / down rope 6a Front jib mast 6b Rear jib mast 7a Pendant rope for front jib mast 7b Pendant rope for rear jib mast 8 Jib up / down rope 9a 9b 9b Rotary slide 10a, 10b Bracket 10c Roller

Claims (6)

[Claims] 1. A boom which is installed to be tiltable, a lower jib which is swingably attached to the boom, a plurality of jib added to the lower jib, and a last jib which is added to the lower jib. A jib comprising an upper jib, wherein the lower jib can be swung so as to be folded below the boom or swung so as to extend on an extension of the boom. A rotating slide equipped with a bracket for attaching to the rear end of the bracket and a roller rotatably supported on the bracket is provided as an accessory, and the bracket of the rotary slide is attached to and detached from the rear end of the joint jib. A luffing jib crane characterized in that it can be mounted as possible. 2. The luffing jib crane according to claim 1, wherein the plurality of joint jib and the joint jib and the lower jib are detachably connected by a jib connecting joint having the same structure, and after the joint jib. A joint that can be connected to the jib coupling joint at the side end is provided on the bracket of the rotary slide, and the bracket of the rotary slide can be detachably attached to the rear end of the joint jib by both joints. A luffing jib crane characterized in that: 3. A method for assembling a luffing jib crane according to claim 1, wherein a lower jib and a joining jib with a rotating slide attached to the lower jib are attached to a lower side of the boom. The initial step of arranging in close proximity, these lower jib and joint jib,
A jib erecting step for erecting the rotary slide while sliding the rotary jig, a rotary slide removing step for removing the rotary slide attached to the raised joint jib, and attaching the upper jib to the joint jib from which the rotary slide has been removed. A luffing jib crane assembling method, wherein the luffing jib crane is assembled through a jib mounting step. 4. A method for assembling a luffing jib crane according to claim 1, wherein the lower jib and a joining jib with a rotating slide attached to the lower jib are extended forward of the collapsed boom. An initial step of arranging the lower jib and the joint jib while sliding the rotary slide, and a jig erecting step of removing the rotary slide attached to the spliced jib. A method for assembling a luffing jib crane, wherein the luffing jib crane is assembled through a removing step and an upper jib attaching step of attaching the upper jib to the joint jib from which the rotary slide has been removed. 5. The method of assembling a luffing jib crane according to claim 3, wherein the upper jib is attached to the joint jib in a state where the jib connecting joint of the upper jib is directed upward. The connecting process at the previous stage of connecting the two joints in a swingable manner in the vicinity of the jib connecting joint of the connecting jib connected to the jib connecting joint, and raising the upper jib by raising the connecting jib. To move the end of the upper jib closer to the end of the joint jib, and then through the subsequent connecting process of connecting the remaining jib connecting joints of the upper jib and the joint jib, to connect the upper jib to the joint jib. A method for assembling a luffing jib crane, wherein the method is adapted to be attached. 6. The method for assembling a luffing jib crane according to claim 3, wherein the rotating slide is removed after the rotating slide removed from the standing jib is removed. Connect the new joint jib to the removed joint jib, attach the rotary slide to the new joint jib, and splice the new joint jib through the process of standing up while sliding the rotary slide. Perform the adding jib adding step and the rotating slide removing step for removing the rotating slide attached to the new joint jib at least once, and then attach the upper jib to the joint jib from which the rotating slide has been removed. An assembling method for a luffing jib crane, wherein an upper jib mounting step is performed.