JP2009286531A - Dismantling method of tower crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dismantling method of a tower crane capable of dismantling a tower crane with small labor and effort and at low cost even if a site for hang-down and dismantling is small. <P>SOLUTION: A main member 91 of a dismantling jib 9 is hung up by a body jib 8 of the tower crane 1, and rockingly coupled to a swiveling stand 6. The body jib 8 is made to generally horizontally fall down, and considering the body jib 8 as a work floor, a lattice member 97 and the like is mounted between main members 91, 91 of the dismantling jib 9, thereby assembling the dismantling jib 9. After the body jib 8 is hung down by the dismantling jib 9, a crane body 31 is descended along a mast 2 by a climbing device, and a mast member 22 is hung down by the dismantling jib 9. The crane body 31 descending near the ground surface is demolished by a small-sized moving crane. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for dismantling a tower crane used for construction work of a high-rise building, for example.

  Conventionally, mast climbing type tower cranes are often used in construction work of high-rise buildings (for example, see Patent Document 1). The mast-climbing tower crane includes a crane body that can be raised along a mast member that is erected on a foundation on the ground surface, and the crane body is an out-up arranged so as to surround the outside of the mast member. A mast and climbing frame, a hydraulic cylinder installed between the outmast and the climbing frame, a swivel connected to the upper end of the outmast and swiveling around the axis of the mast member, and a main body provided on the swivel Jib, hoisting device and cab are provided.

  In the opening surrounding the mast member of the outmast and the climbing frame, there is a hydraulically driven lock pin that protrudes and protrudes toward the mast member, and the lock pin of the climbing frame and the lock pin of the climbing frame are alternately engaged with the mast member Thus, the crane body is raised along the mast member by changing the load and alternately repeating the expansion and contraction of the hydraulic cylinder.

  When the crane body rises to the vicinity of the upper end of the mast member, the new mast member is lifted from the ground by the main body jib, the lower end of the new mast member is connected to the upper end of the existing mast member, and then the crane is moved along the new mast member. The main body is further raised.

When the building of the building is completed, the tower crane is dismantled. In dismantling the tower crane, a mobile or stationary dismantling crane is used. The installation-type dismantling crane is installed adjacent to the tower crane, and the components such as the main body jib and swivel of the crane body are sequentially disassembled, and the disassembled components are suspended from the ground surface by the dismantling crane. After dismantling the crane body, the mast members are sequentially separated from the upper end, the separated mast members are sequentially suspended from the ground surface by the dismantling crane, the mast is dismantled, and the dismantling of the tower crane is completed. After dismantling and removing the tower crane, the dismantling crane is dismantled and removed, and then a predetermined exterior work is performed on the ground surface where the tower crane was installed.
JP 10-139374 A

  However, the above-described conventional tower crane dismantling method may be difficult to secure sufficient site and carry-in route to carry in and install the dismantling crane, depending on the progress of the external construction, location conditions, etc. There is an inconvenience that it is difficult to dismantle the tower crane.

  In addition, the conventional tower crane dismantling method requires that a dismantling crane be installed separately, and the dismantling crane needs to be dismantled and removed after dismantling the tower crane, resulting in a large number of man-hours and increased labor and cost. There is an inconvenience.

  Furthermore, in dismantling the tower crane, it is necessary to separate the long main body jib from the crane body and hang it on the ground surface for dismantling. Here, if the site for dismantling the main body jib cannot be secured, it is necessary to install a large dismantling crane at a position distant from the tower crane and suspend the main body jib from the site far from the tower crane for dismantling. is there. In addition, there is a case where a demolition crane is installed on the rooftop of the building, and the main body jib is suspended from the rooftop of the building. There is an inconvenience that it takes.

  Then, the subject of this invention is providing the dismantling method of the tower crane which can dismantle a tower crane with little effort and expense, even when the site for suspension and dismantling is small.

  In order to solve the above-mentioned problem, the dismantling method of the tower crane according to the invention of claim 1 includes a disassembly jib lifting step of lifting a disassembly jib component member by a main body jib, and one end of a main member of the dismantling jib that has been lifted. , A dismantling jib attachment step that swingably attaches to the swivel, a disassembly jib assembly step that assembles the disassembly jib, and a wire change that replaces the hoisting wire and the undulation wire hung on the main body jib with the disassembly jib A main body jib suspension process for suspending the main body jib by a disassembly jib, a swivel descending process for lowering the swivel base along the mast by a climbing device, and a disassembly jib for the mast member protruding above the swivel base The mast member suspending step for suspending by the above, and a repeating step for repeating the swivel base lowering step and the mast member suspending step. Here, the jib for disassembly uses a thing shorter than a main body jib, for example, the thing of the length of about half of a main body jib can be used.

  According to the above configuration, the disassembly jib is lifted by the main body jib, the disassembly jib is swingably attached to the swivel base, and the disassembly jib is assembled. By changing to, the function of the main body jib can be given to the jib for dismantling. A tower crane can be disassembled without using a dismantling crane by hanging the main body jib with the dismantling jib and lowering the swivel along the mast by a climbing device. Therefore, even if it is difficult to secure sufficient site and loading path to carry in and install the demolition crane due to the progress of the external construction and location conditions, the tower crane can be demolished and removed quickly and inexpensively with a small number of man-hours. It can be performed. Even when the main body jib is long, the main body jib can be hung without installing a dismantling crane. Can be dismantled. Therefore, the tower crane can be disassembled with fewer man-hours and costs than before.

  The tower crane disassembly method according to claim 2 is the tower crane disassembly method according to claim 1, wherein the disassembly jib assembly step is performed using a main body jib that is lying down substantially horizontally as a work floor.

  According to the tower crane disassembling method of the second aspect, by disassembling the dismantling jib using the main body jib as the working floor, the dismantling jib can be assembled quickly and inexpensively without providing a separate working floor.

  The dismantling method of the tower crane of the invention of claim 3 is the dismantling method of the tower crane according to claim 2, wherein two main members of the dismantling jib are arranged on both sides of the main body jib in the dismantling jib attachment step. One end of the main member is attached to each side of the swivel, and the two main members are connected by a connecting member in the disassembly jib assembly process.

  According to the tower crane disassembling method of claim 3, two main members of the dismantling jib are arranged on both sides of the main body jib, and one end of the main member is attached to both sides of the swivel, respectively. By connecting the members with connecting members, the disassembly jib can be easily assembled while the main body jib is used as a work floor.

  The tower crane disassembly method according to claim 4 is the dismantling method of the tower crane according to claim 1, wherein a temporary guy rope is provided between the disassembly jib and the swivel base via a truss in the disassembly jib attachment step. The dismantling jib assembly process is carried out in a state where the dismantling jib is lying down substantially horizontally by extending the temporary guy rope, and the temporary guy rope is removed in the wire exchanging process.

  According to the tower crane dismantling method of claim 4, the dismantling jib can be easily attached to the swivel base by using the temporary guy rope.

  The tower crane dismantling method according to claim 5 is the tower crane disassembling method according to claim 4, wherein the temporary guy rope undulates the dismantling jib by the undulating turnbuckle provided on the swivel base side. It is formed as follows.

  According to the dismantling method of the tower crane of claim 5, the disassembly jib can be undulated via the temporary guy rope by the undulating turnbuckle, so that the main body jib is used as a work floor by adjusting the undulation angle of the dismantling jib. Jib can be assembled. In addition, it is possible to easily change the hoisting wire and the undulating wire from the main body jib while holding the dismantling jib.

  According to the tower crane dismantling method of the present invention, the tower crane can be dismantled without installing a dismantling crane separately, so there are restrictions on the site for dismantling cranes and the site for dismantling the main body jib. Even in this case, the tower crane can be dismantled quickly and inexpensively with less effort than in the past.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a tower crane, and FIGS. 2 to 11 are views showing steps of the tower crane disassembly method of the present invention.

  As shown in FIG. 1, the tower crane 1 is generally configured by a mast 2 and a crane body 3 that moves up and down along the mast 2. The mast 2 is formed by crossing L-shaped steel in a cross shape, and includes a foundation 21 installed on the ground, a plurality of mast members 22, 22,. The diagonal member 23 is stretched between the outer end and the upper end of the lowermost mast member 22.

  The crane main body 3 surrounds the outer side of the mast member 22, and the climbing frame 4 is formed so as to be movable up and down along the mast member 22. The crane body 3 is disposed above the climbing frame 4 and surrounds the outer side of the mast member 22. , A hydraulic cylinder 41 provided between the climbing frame 4 and the outmast 5, and a swivel base 6 connected to the upper end of the outmast 5. The climbing frame 4, the outmast 5, and the hydraulic cylinder 41 constitute a climbing device.

  On the inner side of the climbing frame 4 and the outmast 5, a lock pin that is driven toward and away from the mast member 22 is provided. On the outer periphery of the outmast 5, a landing 51 is provided so as to surround the outmast 5 and in which a hydraulic unit of the hydraulic cylinder 41 is installed. The outmast 5 and the swivel base 6 are connected via a swivel bearing 61 provided at the lower part of the swivel base 6.

  On the swivel base 6, a truss 7 having an undulation wire and a winding wire sheave at the upper end is installed. The truss 7 is composed of a vertical member that stands vertically at the rear of the swivel base 6 and a slant member that extends from the upper end of the vertical member to the front end of the swivel base 6. It has a triangular shape. The truss 7 is typically a right triangle, but is not limited to a right triangle. That is, the vertical member of the truss 7 may be slightly inclined forward or backward. One end of the main body jib 8 is pivotally supported on the front side of the vertical position of the vertical member of the truss 7 of the swivel base 6 so as to be swingable. This body jib 8 typically has a length exceeding 30 m. At the rear part of the swivel base 6, a winding winch 62 for winding the winding wire and a hoisting winch 63 for winding the hoisting wire are provided.

  This tower crane 1 is a mast climbing type tower crane 1 that performs climbing by raising the crane body 3 while extending the mast 2 while the foundation 21 of the mast 2 is installed on the ground surface. In this way, climbing is performed.

  That is, the lock pin of the clam frame 4 protrudes toward the mast member 22, the lock pin is engaged with the horizontal member of the mast member 22, and the lock pin of the outmast 5 is retracted from the mast member 22. The engagement with 22 is released. Thereby, the weight of the crane body 3 is supported by the mast member 22 via the climbing frame 4. In this state, the hydraulic cylinder 41 is driven to extend, and the outmast 5, the swivel base 6, the truss 7, the main body jib 8 and the like are raised. When the hydraulic cylinder 41 reaches the maximum extension stroke, the lock pin of the outmast 5 is engaged with the mast member 22, and the engagement of the lock pin of the climbing frame 4 with the mast member 22 is released. Replace weight support with outmast 5. Thereafter, the hydraulic cylinder 41 is driven to contract and the climbing frame 4 is pulled upward. When the hydraulic cylinder 41 reaches the shortest contraction stroke, the lock pin of the outmast 5 is disengaged from the mast member 22, and the lock pin of the climbing frame 4 is engaged with the mast member 22. The weight support is replaced with the climbing frame 4.

  As described above, the crane body 3 is moved along the mast 2 by alternately changing the support of the weight of the crane body 3 between the climbing frame 4 and the outmast 5 and alternately expanding and contracting the hydraulic cylinder 41. Rise. When the crane main body 3 reaches the upper end of the mast 2, the main body jib 8 lifts and fixes the additional mast member 22 to the upper end of the mast 2, and the mast 2 is one mast member 22 in length. Extend upwards by minutes. After that, the above-mentioned clamming is performed, and the crane body 3 is further raised along the mast 2.

  When construction of the building using the tower crane 1 is completed, the tower crane 1 is disassembled as follows.

  First, as shown in FIG. 2, the main members 91 and 91 of the disassembly jib 9 are lifted by the main body jib 8, and one end of the main member 91 is swingably connected to the swivel base 6. The main member 91 is connected to the swivel base 6 by inserting the swing shaft into shaft holes provided on both sides of the swing fulcrum of the main body jib 8 of the swivel base 6. Thereby, the main member 91 is arrange | positioned at the both sides of the main body jib 8. FIG. When the main member 91 is connected to the swivel base 6, the temporary guy rope 92 having one end fixed to the tip side of the longitudinal center of the main member 91 is passed through the sheave 93 at the upper end of the truss 7, The other end is fixed to the rear part of the swivel base 6. A turnbuckle 94 for extending the temporary guy rope is provided on the other end side of the temporary guy rope 92. 3 is a side view showing a state in which the main member 91 is connected to the swivel base 6 and the main member 91 is raised and lowered by a temporary guy rope 92, FIG. 4 is a plan view, and FIG. 5 is for easy understanding. FIG. 5 is a plan view showing a state in which a main member 91 is attached to the swivel base 6 while omitting a part of the main body jib 8.

  Subsequently, the component parts of the disassembly jib 9 are lifted on the swivel base 6 by the main body jib 8. Thereafter, the main body jib 8 is laid down substantially horizontally, and the disassembly jib 9 is assembled using the main body jib 8 as a work floor. The disassembly jib 9 is assembled by connecting two main members 91 with connecting members. As the connecting member, a leading end connecting member 96 that connects the leading ends of the main member 91 to each other, or a lattice member 97 that connects to each other over the length direction of the main member 91 are used. The disassembly jib 9 can be easily assembled by attaching the tip connecting member 96 and the lattice member 97 to the main member 91 with bolts or pins. Since the main body jib 8 is used as a work floor, a handrail 81 for preventing the worker from falling is installed on the upper part of the main body jib 8. By connecting the two main members 91 with connecting members, a small dismantling jib 9 having a length of about 20 m or less is completed.

  Then, the winding wire hung on the main body jib 8 is removed, and the winding wire is hung on the disassembly jib 9. The winding wire hung on the dismantling jib 9 is roped onto the winding winch 62. Subsequently, the sling wire is hung on the hook at the tip of the winding wire hung on the dismantling jib 9, and the main body jib 8 is hung on the sling wire. Thereafter, the undulation wire hung on the main body jib 8 is removed, the undulation wire is hung on the disassembly jib 9, and the undulation wire hung on the disassembly jib 9 is connected to the undulation block 95. Subsequently, the temporary guy rope of the dismantling jib 9 is removed. FIG. 6 is a view showing a state where the main body jib 8 is suspended by the dismantling jib 9 on which the undulating wire is hung.

  Thereafter, the hoisting winch 62 is driven to be unwound, and the hoisting winch 63 is driven as necessary, and the main body jib 8 is brought to the ground surface by the disassembly jib 9 as shown in the plan view of FIG. 7 and the side view of FIG. Hanging down. When the main body jib 8 is significantly longer than the disassembly jib 9, the main body jib 8 can be suspended while being inclined with respect to the disassembly jib 9 in a plan view, as shown in FIG. The main body jib 8 suspended from the ground surface is disassembled by a small mobile crane or the like and carried out from the construction site. At this time, it is also possible to use a disassembly jib 9 instead of a small mobile crane or the like. Since the tower crane 1 does not have to be installed adjacent to the dismantling crane, it is easy to secure a site for hanging and disassembling even the long main body jib 8. Alternatively, the main body jib 8 may be disassembled into a plurality of jib members having a small size on the roof, and the disassembled jib members may be suspended from the ground surface by the disassembly jib 9.

  When the main body jib 8 is suspended, the crane main body 31 in which the disassembly jib 9 is installed instead of the main body jib 8 is lowered by a procedure reverse to climbing. That is, the lock pin of the clam frame 4 protrudes toward the mast member 22, the lock pin is engaged with the horizontal member of the mast member 22, and the lock pin of the outmast 5 is retracted from the mast member 22. The engagement with 22 is released. In this state, the hydraulic cylinder 41 is driven to contract, and the outmast 5, the swivel base 6, the truss 7, the disassembly jib 9 and the like are lowered. When the hydraulic cylinder 41 reaches the minimum contraction length, the lock pin of the outmast 5 is engaged with the mast member 22, and the engagement of the lock pin of the climbing frame 4 with the mast member 22 is released. The support for the weight of is replaced with the outmast 5. Thereafter, the hydraulic cylinder 41 is driven to extend, and the climbing frame 4 is pulled downward. When the hydraulic cylinder 41 reaches the maximum extension stroke, the lock pin of the outmast 5 is disengaged from the mast member 22, and the lock pin of the climbing frame 4 is engaged with the mast member 22. The weight support is replaced with the climbing frame 4.

  In this way, the crane body 31 is moved along the mast 2 by alternately changing the support of the weight of the crane body 3 between the climbing frame 4 and the outmast 5 and alternately expanding and contracting the hydraulic cylinder 41. And descend.

  When the upper portion of the mast 2 protrudes upward from the swivel base 6 as the crane body 31 descends, the protruding mast member 22 is removed from the mast 2 and the removed mast member 22 is suspended from the ground surface by the disassembly jib 9. By repeating the lowering of the crane body 31 and the suspension of the mast member 22, the crane body 31 reaches the vicinity of the ground surface. FIG. 10 is a side view showing a state in which the crane body 31 is lowered from the foundation 21 to the third mast member 22, and FIG. 11 is a plan view. Since the main body jib 8 is replaced with a small dismantling jib 9, the crane main body 31 can be easily lowered even if the tower crane 1 is arranged close to the building.

  When the crane main body 31 reaches the vicinity of the ground surface, a small mobile crane is loaded adjacent to the crane main body 31, and the crane main body 31 is disassembled with the mobile crane. Since the main body jib 8 of the crane main body 31 is replaced with a small dismantling jib 9, the crane main body 31 can be disassembled by a small mobile crane. When the dismantling of the crane body 31 is completed, the foundation 21 on the ground surface, the mast member 22 and the diagonal member 23 connected to the foundation 21 are disassembled with a mobile crane, and all the components of the tower crane 1 are removed from the construction site. Take it out.

  As described above, the tower crane according to the present embodiment replaces the long main body jib 8 with the small dismantling jib 9 and suspends the main body jib 8 with the dismantling jib 9, thereby using the climbing device to mast 2 It is possible to descend along. Therefore, it is not necessary to install a large dismantling crane for dismantling the tower crane 1, and even when it is difficult to carry in and install a large dismantling crane due to the progress of external construction or location conditions, etc. The tower crane 1 can be disassembled and removed quickly and inexpensively with a small number of man-hours. Further, even when the main body jib 8 is long, the main body jib 8 can be hung without installing a dismantling crane, so that it is possible to secure a region for hanging and dismantling the main body jib 8. The main body jib 8 can be dismantled even on the site where dismantling was difficult. Therefore, the tower crane 1 can be disassembled with fewer man-hours and costs than before.

  In the above embodiment, the mast climbing type tower crane in which the main body crane 3 rises while the mast member 22 is added on the foundation 21 installed on the ground surface has been described, but the tower crane is arranged inside the building, It can be applied to a floor climbing type tower crane in which the foundation of the lower end of the mast is replaced with an upper floor slab as the building floor slab is constructed, and the crane body is raised. In this case, the tip of the dismantling jib 9 is extended to the outside of the building.

It is a figure which shows a tower crane. It is a figure which shows a mode that the main member of the jib for dismantling was attached to the turntable. It is a side view which shows a mode that the main member was connected with the swivel stand, and was undulated with the temporary guy rope. It is a top view which shows a mode that the main member was connected with the swivel stand, and was undulated with the temporary guy rope. It is the top view which showed a mode that the main member was attached to the turntable. It is a figure which shows a mode that the main body jib was suspended with the jib for dismantling. It is a top view which shows a mode that a main body jib is suspended on the ground surface with the jib for dismantling. It is a side view which shows a mode that a main body jib is suspended on the ground surface with the jib for dismantling. It is a top view which shows a mode that a main body jib is suspended on the ground surface with the jib for dismantling. It is a side view which shows a mode that the crane main body fell. It is a top view which shows a mode that the crane main body fell.

Explanation of symbols

1 tower crane 2 mast 3 crane body 4 climbing frame 5 outmast 6 swivel 7 truss 8 body jib 9 jib for dismantling

Claims (5)

Dismantling jib lifting step of lifting the dismantling jib components by the main body jib;
A disassembly jib attachment step for attaching one end of the main member of the lifted disassembly jib to the swivel so as to be swingable;
Disassembly jib assembly process for assembling disassembly jib,
A wire changing step of changing the hoisting wire and the undulating wire hung on the main body jib to the dismantling jib;
A main body jib suspension step of suspending the main body jib with a disassembly jib,
A swivel descending step of lowering the swivel along the mast by a climbing device;
A mast member suspension step of hanging a mast member protruding above the swivel base with a jib for dismantling,
A dismantling method for a tower crane, comprising a repeating step of repeating a swivel descending step and a mast member hanging step. In the dismantling method of the tower crane of Claim 1,
A dismantling method for a tower crane, wherein the disassembling jib assembling step is performed by using a main body jib that is lying down substantially horizontally as a work floor. In the dismantling method of the tower crane of Claim 2,
In the disassembly jib attachment process, two main members of the disassembly jib are arranged on both sides of the main body jib, and one end of the main member is attached to both sides of the swivel, respectively.
A dismantling method for a tower crane, wherein two main members are connected by a connecting member in a disassembly jib assembling step. In the dismantling method of the tower crane of Claim 1,
In the dismantling jib attachment process, a temporary guy rope is passed through the truss between the dismantling jib and the swivel,
Perform the disassembly jib assembly process with the temporary guy rope extended and the dismantling jib lying down almost horizontally,
A method for dismantling a tower crane, wherein a temporary guy rope is removed in a wire changing process. In the dismantling method of the tower crane of Claim 4,
A temporary crane rope is formed so as to undulate a jib for dismantling with a turnbuckle for undulation provided on a swivel side, and a dismantling method for a tower crane.

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