JP2014043319A - Method and device for assembling front attachments of crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and surely perform connection and assembling of front attachments of a crane.SOLUTION: Mutual connection object components of an inner gib 2, a front strut 3, and a rear strut 4 are unitized to a boom 1 being a front attachment of a crane. Unitization is performed by connecting an end part of the front strut 3 to a frame 16 fixed to a base end part of the inner gib 2, and connecting an end part of the rear strut 4 to a frame 15 connected to the base end part of the inner gib 2 to be rotatable. After an engagement shaft part 20 provided at an end part of the rear strut of a unitized connection object component I is engagedly connected to an upper connection part UJ of a tip part of the boom 1, the connection object component I is rotated centering on an engagement part, and the inner gib base end part is positioned to a lower connection part DJ of the boom tip part to be connected.

Description

  The present invention relates to an assembling method and apparatus used when assembling a boom, a jib, and a strut used as a front attachment (working device) of a crane. Specifically, a unitized jib and two struts are attached to the tip of the boom. The present invention relates to an assembling method and an apparatus used when assembling and assembling.

  Among the cranes, for example, a mobile crane has a lower traveling body such as a crawler, an upper revolving body that is turnably mounted on the lower traveling body, and a front attachment attached to the front end of the upper revolving body. doing.

  The front attachment of the mobile crane includes a boom that is attached to and used at a front end of the upper swing body, and a jib that is used by connecting a base end to the tip of the boom so as to be raised and lowered. In addition, there is a roughing specification with two struts, a front strut and a rear strut.

  In a mobile crane of such a luffing specification, when assembling a front attachment by connecting a boom, a jib, and two struts, a jib, two struts, Etc., so many parts were connected individually.

  For this reason, the on-site connection work was difficult, and it took a lot of time and labor to assemble the front attachment.

  Therefore, in recent years, in order to be able to easily connect the connection target parts such as the boom, the jib connected to the tip of the boom, and two struts, the connection target parts are integrated into a unit. Therefore, it has been proposed to connect a component to be connected as a unit to a tip portion of a boom.

  For example, the front strut and the rear strut are stacked in order on the upper side of the jib of the component to be connected, and the front strut and the rear strut are connected to the jib to be integrated into a unit. (For example, see Non-Patent Document 1 and Non-Patent Document 2).

Catalog page 33 of “Transport Data”, [online], 9.15m Luffing Jib Bottom Section [searched on August 6, 2012], Internet <URL: http: // www. hsc-crane. com / e / common / pdf / scx2800-2tw_sp. pdf> Catalog page 42 of “SENNEBOGEN 7700”, [online], Lower boom WS 11.6m type 2002 (with2a-frames) [searched on August 6, 2012], Internet <URL: http: // sennebogen. de / katalogu / 7700_1111 />

  However, both Non-Patent Document 1 and Non-Patent Document 2 only show a configuration in which two struts are connected to a jib and a component to be connected to the boom tip is unitized. No means for connecting to the tip of the boom is disclosed at all.

  Therefore, what is described in Non-Patent Document 1 and Non-Patent Document 2 described above is how to connect the unitized component to be connected to which part of the tip of the boom on site. It is unclear whether it is connected so as to be a support structure or a two-point support structure.

  Therefore, the present invention provides a simple assured connection between the connecting surface of the parts to be connected such as the unitized jib and the two struts and the connecting surface of the boom tip so that it can be assembled on site. It is an object of the present invention to provide a crane front attachment assembling method and apparatus capable of shortening the time.

  In order to solve the above-described problem, the present invention provides a method for assembling a front attachment of a crane in which a jib is connected to a boom tip portion of a crane, and one and the other two struts are coupled and assembled, The inner jib connected to the front end of the boom of the front attachment and the parts to be connected of one and the other two struts are connected to a frame in which the end of one strut is fixed to the base end of the inner jib. The other strut end is connected to a frame that is connected to the base end of the inner jib so that the end can be turned into a single unit, and the end of the other strut of the component to be connected is united. , Engaging the upper connecting portion of the boom tip, and receiving the connecting side of the component to be connected by the upper connecting portion of the boom tip. The elbow part can be rotated with the upper connection part as a fulcrum, and then the connection target part is rotated with the upper connection part of the boom tip as a fulcrum, and the lower part of the boom tip is connected to the lower connection part. A method for assembling the front attachment by aligning and connecting the inner jib base end portions of the target parts.

  According to a second aspect of the present invention, in the crane front attachment assembly apparatus, the jib is connected to the crane boom tip side, and one and the other two struts are connected and assembled to the boom tip portion of the front attachment. The inner jib and the parts to be connected of the two struts, one and the other, are integrated into a unit, a connecting groove is provided at two locations on the top and bottom of the boom tip, and a locking groove that opens the upper connecting part upward is provided. The unit is connected to the locking groove of the upper connecting portion of the boom tip at a position shifted from the end of the other strut or the end of the other strut of the unitized connection target part. An engaging shaft portion is provided, and the component to be connected, which is connected by engaging the engaging shaft portion with the engaging groove, can be rotated about the engaging groove; and And lower connecting portions of the boom tip, an inner jib base end portion of the consolidated parts, so as to be connected are aligned, a configuration which is adapted assemble the front attachment.

  Further, in accordance with claim 3, the lower connecting portion of the boom tip portion is a bracket having a pin insertion hole for the connecting pin, and the positioning mechanism is positioned above the position of the pin insertion hole of the bracket. A pin insertion hole corresponding to the pin insertion hole of the bracket at the tip of the boom is provided at the base end of the inner jib of the component to be connected as a unit, and provided at the bracket at the tip of the boom at the distal end surface. Provided with a positioning mechanism that is guided and locked by the positioning mechanism, and the inner jib base end bracket is fitted to the boom front end bracket. The pin insertion hole is configured to be aligned.

  Corresponding to claim 4, the end of one strut of the part to be connected can be connected to a frame fixed to the base end of the inner jib, and the end of the other strut can be rotated to the inner jib base end. It connects with the frame connected in this way, and it is set as the structure which united connection object parts by connecting the edge parts of each strut further detachably.

According to the crane front attachment assembling method and apparatus of the present invention, the following excellent effects are exhibited.
(1) An inner jib connected to the boom tip and two struts to be connected are integrated into a single unit, and the upper side of the unitized connection target is engaged with the upper connecting part of the boom tip. After supporting, the lower part of the connection target part is connected to the lower connection part of the boom tip, so the connection target part can be rotated about the upper side, so that the lower connection is aligned. It becomes easy, and it can be simply and quickly and reliably connected.
(2) According to the above (1), even if the unitized component to be connected is heavy and easily swings in the suspended posture, it is stabilized by being engaged with the upper connecting portion of the boom tip portion. It is possible to easily connect the component to be connected to the lower connecting portion of the boom tip portion.

It is a schematic side view which shows one Embodiment of this invention. It is a side view which expands and shows the A section of FIG. It is a partially cutaway side view which expands and shows the B section of FIG. FIG. 4 is a partially cutaway side view showing a state in which the bracket of the inner jib base end portion is fitted to the bracket of the boom tip end portion from the state of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 to 4 show an example in which the present invention is applied to the assembly of a roughing crane as an embodiment of the present invention.

  That is, the boom 1 used for the front attachment of the crane, the inner jib 2 in the jib, the front strut 3 as one strut, and the rear strut 4 as the other strut are assembled with the inner jib 2, front strut 3 and rear strut. The four parts to be connected are integrated into a unit as indicated by reference numeral I. Next, after the unitized connection target component I is brought into the field, the upper and lower two positions on the connection side (the base end side of the inner jib 2) of the connection target component I are set at the two upper and lower positions on the tip of the boom 1 Roughing cranes are assembled by engaging the connecting parts UJ and DJ with the upper connecting part UJ and positioning and connecting with the lower connecting part DJ.

  More specifically, the boom 1 is composed of four members 1a and a lattice 1b. A triangular frame 5 is protruded from the both ends of the width direction (left and right direction) to the front end side symmetrically from both sides in the width direction (left and right direction), and the left and right frames 5 extend in the width direction. It is reinforced by a member that does not, and has an integrated structure. Further, as shown in an enlarged view in FIG. 3, the distal ends of the left and right frames 5 are slightly inserted at the rear of the insertion hole 7 for the connecting pin and the position of the insertion hole 7 which characterize the present invention. A bracket 6 having a bifurcated structure in which two plate members each having a positioning member 8 such as a pin or a screw extending in the left-right direction are attached in the vertical direction is attached to the upper position. The lower connecting portion DJ is used.

  Further, another frame 9 is attached to the upper side of each of the left and right frames 5, and the frames 9 are reinforced by members extending in the width direction (left and right direction) not shown in the same manner as the frame 5. It is an integrated structure. As shown in an enlarged view in FIG. 2, the distal ends of the left and right frames 9 have openings in the upward and distal directions that characterize the present invention when the boom 1 is in a horizontal state. The brackets 10 having the locking grooves 11 to be attached are respectively attached, and the position of the locking grooves 11 of the bracket 10 is set as the upper connecting portion UJ.

  The inner jib 2 as the connection target component I is composed of four members 2a and a lattice 2b as in the boom 1, and each of the two members 2a on both sides in the width direction (left-right direction) of the base end portion. As shown in an enlarged view in FIG. 3, a plate member is protruded from the end of the boom 1 so as to be fitted into the bracket 6 having a bifurcated structure that serves as the lower connecting portion DJ at the tip of the boom 1. A bracket 12 as a structure is fixedly provided. The bracket 12 is provided with an insertion hole 13 corresponding to the insertion hole 7 of the connecting pin of the bracket 6 in the center portion, and a positioning member as a positioning mechanism provided in the bracket 6 on the boom 1 side. 8 is configured such that an arcuate locking portion 14 serving as a positioning mechanism that can be locked while being guided by 8 is formed on the tip surface. The brackets 12 on both the left and right sides of the base end portion of the inner jib 2 are connected with a member (not shown) that is connected to a position that avoids the insertion hole 13 for the connecting pin and is integrally formed. The one end portion (lower end portion) of the base frame 15 is rotatably connected to the bracket connecting member.

  The lower end is fixed to the left and right brackets 12 at the base end of the inner jib 2 and the member 2a located on the upper left and right sides at the base end side of the inner jib 2, and the upper end is fixed to the bracket 17 with the connecting arm 18. The fixed frame 16 is provided symmetrically. The bracket 17 fixed to the top of each of the left and right frames 16 has the ends of the main members 3a on the left and right sides of the front strut 3 constituted by the four members 3a and the lattice 3b on the pins 19. It is designed to be connected in a undulating manner.

  Further, a member (not shown) extending in the left-right direction is attached to the other end portion (upper end portion in the drawing) of the base frame 15, and brackets 21 are attached to the left and right end portions of the member extending in the left-right direction. As with the front strut 3, the left and right brackets 21 are pivoted by pins 20 at the ends of the main members 4 a on the left and right sides of the rear strut 4, which is composed of four members 4 a and lattices 4 b. The rear struts 4 are connected to each other so that the rear strut 4 can move up and down with the pin 20 of the bracket 21 as a fulcrum, and can move up and down with the base end of the inner jib 2 through the base frame 15 as a fulcrum. . The pin 20 that connects the ends of the left and right members 4a of the rear strut 4 to the bracket 21 is engaged with and engaged with the engaging groove 11 of the upper connecting portion UJ on the tip end side of the boom 1 described above. Functioning as an engaging shaft portion. A connecting arm 18 of a bracket 17 fixed to the frame 16 is detachably connected to the bracket 21 by a pin 22. By removing the pin 22, the front strut 3 and the rear strut 4 are separated. It is supposed to be.

  In this way, the component I to be connected connects the end of the front strut 3 to the base end of the inner jib 2 via the frame 16 and connects the end of the rear strut 4 via the base frame 15. Further, the front strut 3 and the rear strut 4 are connected to each other by connecting the connecting arm 18 of the bracket 17 on the front strut 3 side to the bracket 21 on the rear strut 4 side by pivoting the pin 22. 2. The front and rear struts 3 and 4 are integrated into a unit.

  In the figure, reference numeral 23 denotes a wire used when the unitized connection target component I is hung before being connected to the tip of the boom 1.

  Since the crane assembling apparatus of the present invention is configured as described above, the component to be connected I that has been unitized in advance is loaded on the truck, etc. The base end side of the connection target component I is positioned opposite to the tip end side of the boom 1.

  Next, the unitized connection target parts I carried in the field move freely and easily in the vertical and horizontal directions in order to connect to the two connecting parts UJ and DJ at the top and bottom of the tip of the boom 1. It can be so.

  For this purpose, for example, as shown in FIG. 1, the suspension wire 23 of the auxiliary crane is attached to the unitized inner jib 2 of the connection target component I, and the entire connection target component I is connected as shown in FIG. The base end side, which is the connection side of the component I, is lifted so as to be inclined downward, and in this state, the connection side is brought close to the connection portions UJ and DJ at the two upper and lower positions of the tip of the boom 1.

  Since the component I to be connected is in a state of being easily swung by being lifted by an auxiliary crane, the connection target component I is caused to approach the distal end side of the boom 1 by guidance of an operator.

  When the connection target component I is brought closer to the distal end side of the boom 1, first, the upper end side connection of the connection target component I is inserted into the engagement grooves 11 on both the left and right sides of the upper connection portion UJ at the distal end portion of the boom 1. The pin 20 which is the engagement shaft portion at the end of the rear strut 4 which is a point is fitted and received so as to drop from above. As a result, the connection side of the component I to be connected as a unit is supported by the upper connection portion UJ on the tip end side of the boom 1 as a whole through the pin 20 that is the engagement shaft portion of the end portion of the rear strut 4. Will be. Since the engaging groove 11 has a cross-sectional shape that is open upward and toward the tip of the boom 1, the pin 20 that is the engaging shaft portion of the rear strut 4 of the connection target component I is used. Is lowered while approaching the engaging groove 11, it can be easily fitted and engaged with the engaging groove 11. In this case, unlike a normal pin connection method, pin insertion is not necessary, and assembly is easy.

  Next, the lower end of the connection target component I is rotated in the clockwise direction in FIG. 1 while the pin 20 engaged with the engagement groove 11 is lowered on the connection target component I suspended by the auxiliary crane. The bracket 12 at the base end portion of the inner jib 2 that is the connecting point on the side is brought close to the bracket 6 that is the lower connecting portion DJ at the tip end portion of the boom 1. At this time, the bracket 12 at the base end portion of the inner jib 2 is centered on the pin 20 which is the engaging shaft portion at the end portion of the rear strut 4 engaged with the upper connecting portion UJ on the tip end side of the boom 1. It can be rotated with a circular arc. When the arcuate locking portion 14 of the bracket 12 hits the positioning member 8 of the bracket 6 of the lower connection portion DJ on the boom 1 side and stops, the connection target component I cannot be rotated. Thus, by stopping the rotation of the connection target component I, positioning is performed so that the pin insertion hole 13 of the bracket 12 and the pin insertion hole 7 of the bracket 6 are concentrically matched. Become. That is, in the present invention, the bracket 12 can be positioned by being abutted against the positioning member 8 of the bracket 6.

  Therefore, when connecting the bracket 12, which is the lower connection point of the component I to be connected, to the lower connection portion DJ of the tip portion of the boom 1, after being engaged with the upper connection portion UJ of the tip portion of the boom 1. The bracket 20 at the end of the inner jib 2 is rotated around a pin 20 that is an engagement shaft at the end of the strut 4 so that the bracket 6 of the lower connecting portion DJ of the boom 1 side has a bifurcated structure. The arcuate locking portion 14 of the bracket 12 is rotated along the positioning member 8 while being fitted inside. Since the positioning is automatically performed when the arcuate locking portion 14 of the rotating bracket 12 on the connection target component I side is locked by the positioning member 8 and stopped, the rotation of the connection target component I is performed. Is stopped, the connecting pin is passed from the outside of the bracket 6 through the pin insertion hole 7 of the bracket 6 and the pin insertion hole 13 of the bracket 12 on the inner jib 2 side, thereby lowering the lower end of the boom 1. The side connecting portion DJ and the bracket 12 that is the lower connecting point of the connection target component I are connected.

  In this way, when the connection of the unitized connection target component I to the distal end portion of the boom 1 is completed, the jib distal end portion is coupled to the distal end side of the inner jib 2.

  In the above description, the connection between the lower connecting portion DJ at the front end portion of the boom 1 and the bracket 12 that is the lower connection point of the component I to be connected is that the arcuate locking portion 14 at the front end portion of the bracket 12 is the front end portion of the boom 1. It is designed to be positioned only by being pressed against the positioning member 8 attached to the bracket 6, that is, by being positioned and stopped while being guided after hitting the positioning member 8. There is an advantage that the centering of the pin insertion hole 7 of the bracket 6 on the boom 1 side and the pin insertion hole 13 of the bracket 12 on the connection target component I side can be easily and reliably performed. Further, since the positioning member 8 is provided at a position higher than the position of the pin insertion hole 7 of the bracket 6, after connecting the connection target component I to the tip of the boom 1 and assembling the crane, When the boom 1 and the inner jib 2 are put into the working state, the positioning member 8 does not become an obstacle.

  Note that the present invention is not limited to the above-described embodiment. For example, the locking grooves 11 of the bracket 10 serving as the upper connection portion UJ of the tip of the boom 1 are provided on the left and right sides of the boom tip. Although the case where the pin 20 is received at two places on the left and right is shown, the locking groove 11 is a united connection as a structure provided on either the left or right or one place in the center. The upper connecting portion of the target component I may be a one-point support method, and the case where the locking groove 11 is opened so as to have a cross-sectional shape in a letter shape is shown. However, any groove shape can be used as long as the pin 20 can be engaged and supported, such as a U-shaped structure or V-shape opening only upward. Furthermore, although the bracket 6 which becomes the lower side connection part DJ of the front-end | tip part of the boom 1 showed the case where the bracket 12 of the inner jib base end part made into plate shape can be fitted as a bifurcated structure, The bracket 12 may have a bifurcated shape, and the bracket 6 may have a plate shape. The pin 20 that connects the end of the rear strut 4 to the bracket 21 is connected to the engaging groove of the upper connecting portion UJ on the boom 1 side. Although the case where the engaging shaft portion is engaged with the pin 11 is shown, the engaging shaft portion may be separately provided at a position shifted from the position of the pin 20. Although the case where the positioning member 8 and the arcuate locking portion 14 are used as the positioning mechanism has been shown, the present invention is not limited to this, and when the bracket 12 is fitted to the bracket 6, positioning can be performed by a stopper. Anything can be used. Furthermore, although the example in which the connection target component I is hung with an auxiliary crane when connecting the tip of the boom 1 is illustrated, it is also possible to prepare a lifting mechanism to lift the connection target component I, and to move Although the case of the type crane has been shown, it is a matter of course that it can be applied to other cranes, and other various modifications can be made without departing from the scope of the present invention.

I Parts to be connected 1 Boom 2 Inner jib 3 Front strut 4 Rear strut 5 Frame 6 Bracket 7 Pin insertion hole 8 Positioning member (positioning mechanism)
9 Frame 11 Engaging groove 12 Bracket 13 Pin insertion hole 14 Arc-shaped locking part (positioning mechanism)
15 Base frame 16 Frame 20 Pin (engagement shaft)

In order to solve the above-described problem, the present invention provides a method for assembling a front attachment of a crane in which a jib is connected to a boom tip portion of a crane, and one and the other two struts are coupled and assembled, The inner jib connected to the front end of the boom of the front attachment and the parts to be connected of the one and the other two struts to one frame in which the end of one strut is fixed to the base end of the inner jib The end of each strut is connected to the other end of the inner jib so that the end of the other strut can be rotated to the base end of the inner jib separately from the one frame. unitized integrally with the position apart from the end portion, on which is connected to the other frame of the consolidated parts by the unitized The end of the other strut, is engaged with the upper connecting portion of the boom tip, it receives the connection side of the consolidated parts upper connecting portion of the boom tip of the consolidated part to the upper connecting portion It is possible to rotate as a fulcrum, and then rotate the connection target part with the upper connection part of the boom tip part as a fulcrum, to the lower connection part of the boom tip part to the inner jib base end part of the connection target part Are aligned and connected to assemble the front attachment.

According to a second aspect of the present invention, in the crane front attachment assembly apparatus, the jib is connected to the crane boom tip side, and one and the other two struts are connected and assembled to the boom tip portion of the front attachment. The inner jib and the parts to be connected of the two struts, one and the other, are connected to one frame in which the end of one strut is fixed to the base end of the inner jib, and the end of the other strut is connected Separately from the one frame, by connecting to the other frame that is pivotally connected to the base end of the inner jib, the end of each strut is positioned away from the base end of the inner jib so as to be integrated. The unit is configured to have a locking groove that is provided with two connecting parts at the top and bottom of the boom tip and opens the upper connecting part upward. A position shifted from the edge position of the strut end or said other of said other strut which in Tsu Doo reduction above the other frame of the connection target component has been connected, the lock of the upper connecting portion of the boom tip An engagement shaft portion that engages with the engagement groove is provided, and a component to be connected, which is connected by engaging the engagement shaft portion with the engagement groove, can be rotated about the engagement groove, and The lower attachment part of the boom tip part and the inner jib base end part of the connection target part can be aligned and connected so that the front attachment is assembled.

Corresponding to claim 4, the configuration was such that one of the units of the consolidated parts together by detachably connected end portions of the end and the end of the other strut of the strut of the connection target component and To do.

According to the crane front attachment assembling method and apparatus of the present invention, the following excellent effects are exhibited.
(1) The inner jib connected to the boom tip and the parts to be connected of the two struts are connected to one frame in which the end of one strut is fixed to the base end of the inner jib, and the other The end of each strut is separated from the base end of the inner jib by connecting the end of the strut to the other frame connected to the base end of the inner jib separately from the one frame. The unit is integrated into a unit, and the end of the other strut on the upper side of the unitized connection target part is engaged with and supported by the upper connection part of the boom tip part, and then the lower side of the connection target part of the inner jib base end portion, since the connection to the lower connection of the boom tip, consolidated parts from that is pivoted an upper fulcrum, easily connecting the lower side to the alignment, the simple It can be and securely coupled to the speed.
(2) According to the above (1), even if the unitized component to be connected is heavy and easily swings in the suspended posture, it is stabilized by being engaged with the upper connecting portion of the boom tip portion. It is possible to easily connect the component to be connected to the lower connecting portion of the boom tip portion.

Claims (4)

In the assembling method of the front attachment of the crane, the jib is connected to the tip of the boom of the crane and the two struts of one and the other are connected and assembled.
The inner jib connected to the front end of the boom of the front attachment and the parts to be connected of one and the other two struts are connected to a frame in which the end of one strut is fixed to the base end of the inner jib. The unit of the other strut is unitized by connecting to the frame connected to the base end of the inner jib so that it can rotate.
The end of the other strut of the unitized connection target part is engaged with the upper connection part of the boom tip part, and the connection side of the connection target part is received by the upper connection part of the boom tip part. The part to be connected can be turned around the upper connection part as a fulcrum,
Next, the connection target component is rotated using the upper connection portion of the boom tip portion as a fulcrum, and the inner jib base end portion of the connection target component is aligned and connected to the lower connection portion of the boom tip portion. Assembling the front attachment of a crane, comprising assembling a front attachment. In the assembly apparatus for the front attachment of a crane that assembles a jib on the boom tip side of the crane and connects the two struts of one and the other,
The inner jib connected to the boom tip of the front attachment and the parts to be connected of one and the other two struts are unitized as a unit.
Provided with a connecting groove at two locations above and below the boom tip, and provided with a locking groove that opens the upper connecting portion upward,
The engaging shaft that engages with the locking groove of the upper connecting portion of the boom tip portion at a position shifted from the end portion of the other strut of the unitized component to be connected or the end position of the other strut. Set up a section,
The connection target part connected by engaging the engagement shaft part with the engagement groove can be rotated with the engagement groove as a fulcrum, and the lower connection part of the boom tip part and the connection object A front attachment assembly apparatus for a crane, characterized in that the front attachment is assembled so that the inner jib base end portions of the parts can be aligned and connected. The lower connection part of the boom tip part is a bracket having a pin insertion hole for a connection pin, and a positioning mechanism is provided at a position above the position of the pin insertion hole of the bracket,
In addition, a positioning mechanism is provided in which the pin insertion hole corresponding to the pin insertion hole of the bracket at the boom front end portion is provided at the inner jib base end portion of the unitized connection target part and the boom front end bracket is provided at the front end surface. A bracket having a positioning mechanism that is guided and locked by the bracket is provided, and the bracket at the base end of the inner jib is fitted to the bracket at the tip of the boom, and each pin insertion hole is fitted. The crane front attachment assembly apparatus according to claim 2, wherein the positioning of the crane is performed. Connect the end of one strut of the component to be connected to the frame fixed to the base end of the inner jib, and connect the end of the other strut to the frame connected to the inner jib base end so that it can rotate. The crane front attachment assembling apparatus according to claim 2 or 3, wherein the parts to be connected are unitized by detachably connecting the ends of the struts.

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