JP5654280B2 - Jib crane and its dismantling method - Google Patents

Description

  The present invention relates to a jib crane suitable for use in dismantling a large tower crane installed on a roof, and more specifically, a base that can be fixed to a building frame and a plurality of mast members that are erected on the base. The climbing device includes a mast configured as above, an outmast arranged up and down so as to surround the outer side of the mast, a climbing frame, and a hydraulic cylinder for raising and lowering drive arranged between them. The present invention relates to a jib crane comprising a crane body and a dismantling method thereof.

  The dismantling of a large tower crane installed on the roof of a skyscraper with a height exceeding 100 m cannot be performed from the ground. Therefore, using a large tower crane on the roof, lift a small jib crane on the roof, dismantle the large tower crane with this jib crane and lower it to the ground, then lift a small jib crane on the roof, A method of dismantling is adopted, such as gradually disassembling the previous jib crane and lowering it to the ground, gradually replacing it with a smaller jib crane, disassembling the last jib crane by human hands, and lowering it to the ground by an elevator or the like.

  By the way, in the case of a large tower crane of 400 to 600 t · m class, currently there are three large (150 t · m class), medium (40 t · m class) and small (5 t · m class) jib cranes as demolition machines. There is a need for the three-stage disassembly process used.

  The main reason is that in the conventional jib crane used for dismantling the large tower crane, when the jib crane itself is dismantled, the crane body is reverse-climbed along the mast, and the mast member on the upper stage sequentially pulls out by itself. This is because only the lowermost mast member (length 6 m, weight about 5 t) cannot be pulled out by itself, and a medium-sized jib crane with a large lifting capacity is required for removing the lowermost mast member.

  The second reason is that for dismantling large tower cranes, a jib crane with a working radius of about 25m with a jib of about 29m is used as the dismantling machine. This is because the 29m jib cannot be disassembled as it is, and a medium-sized jib crane as an intermediary machine is required to disassemble the 29m jib as a single unit.

  Therefore, in the past, three jib cranes were used for dismantling large tower cranes of 400 to 600 t · m class. Therefore, a large space for crane dismantling must be secured in advance on the rooftop. However, there was a problem that the construction cost was increased due to an increase in the number of buildings and facilities, which was disadvantageous in terms of construction, and the cost was high due to the large number of dismantling cranes.

  A large dismantling jib, which is about half the length of the main body jib, is lifted by a large tower crane. After hanging down, the crane body is reverse-climbed, the mast is sequentially pulled out from the upper mast member by itself, and when the crane body descends to the lowermost mast member, the crane body is disassembled by another moving crane and Patent Document 1 proposes a tower crane dismantling method for disassembling the lowermost mast member. However, this Patent Document 1 does not disclose a technique for pulling out the lowest mast member by itself.

JP 2009-286531 A

  The present invention has been made in view of the above-described problems, and the object of the present invention is to be able to pull out the mast member at the lowest stage by itself and is suitable for use in dismantling a large tower crane. And to provide a method for dismantling it.

In order to achieve the above object, technical measures taken by the present invention are as follows. That is, in the first aspect of the invention, a pedestal that can be fixed to the building frame, a mast formed by connecting a plurality of mast members erected on the pedestal, and up and down so as to surround the outside of the mast. And a crane main body configured to be movable up and down with respect to the mast by a climbing device including a climbing frame disposed between the outmast and the climbing frame and a lift driving hydraulic cylinder. In the state where it is lowered to the position supported by the member, the climbing frame is removed, and the lower end of the hydraulic cylinder connected to the climbing frame is connected to the cylinder receiving beam attached to the pedestal. Lower the outmast and connect it to the pedestal.In this state, lift the lowermost mast member up with the jib of the crane body. To and sampling can configure, further normally workable configured as tower type jib crane in this state, down to clamshell jib tip half of the jib to the floor level by winding wire instrumented hoist the crane body The crane body was mounted on the crane body with the jib remaining by the hoisting wire of the hoisting device mounted on the crane body lowered to a height that can be dismantled by a small crane that can be hand-rolled. After hanging the back stay out of the front stay and the back stay constituting the truss having guide sheaves for the winding wire and the undulating wire, the front stay of the truss is connected to the top of the truss by the winding wire connected to the top of the truss. The remaining jib will be moved back to the height that can be dismantled by The lower side of the back stay and the upper side of the back stay are connected by a connecting bolt so that the truss can be disassembled by a small crane, and when the back stay is suspended. The lower side of the back stay is separated from the upper side so that it can remain, and the front stay is configured so that it can be bolted to the lower side of the back stay that remains when the back stay is lowered. A jib crane is provided.

A method for disassembling a jib crane according to a second aspect of the present invention includes a pedestal that can be fixed to a housing of a building, a mast formed by connecting a plurality of mast members erected on the pedestal, and surrounding the outside of the mast. A jib crane dismantling method comprising an outmast arranged vertically and a climbing frame and a crane main body configured to be movable up and down with respect to the mast by a climbing device having a hydraulic cylinder for raising and lowering arranged between them. There,

  In the state where the crane body is lowered to the position supported by the lowermost mast member, the climbing frame is removed, and the lower end of the hydraulic cylinder connected to the climbing frame is connected to the cylinder receiving beam attached to the pedestal. The mast dismantling step by the jib crane itself, in which the outmast is lowered by the reduction of the hydraulic cylinder and connected to the pedestal, and in this state, the lowermost mast member is pulled upward by the jib of the crane body,

  Disassembling the jib tip side by the jib crane itself, folding the jib in half and lowering the half of the jib to the floor level by the hoisting wire of the hoisting machine installed in the crane body,

The jib remaining by the hoisting wire of the hoisting device installed in the crane body is lowered to a height at which dismantling work can be performed by a small crane capable of hand-balancing, and the hoisting wire and hoisting equipped in the crane main body by the small crane After hanging the back stay out of the front stay and back stay that constitute the truss having the wire guiding sheave, the front stay of the truss is lifted up so that it can be disassembled by the small crane with the wire. And a dismantling process by a small crane for dismantling the remaining jib and truss.

According to the jib crane in the first aspect of the present invention, the lowermost mast member can be pulled out by itself, which is suitable for use in dismantling the large tower crane installed on the rooftop.

  In other words, this jib crane has a crane body with respect to the mast by a climbing device having an outmast arranged up and down so as to surround the outer side of the mast, a climbing frame, and a hydraulic cylinder for driving up and down arranged therebetween. In the state where the crane body is lowered to the position supported by the lowest mast member, the climbing frame is removed and the lower end of the hydraulic cylinder connected to the climbing frame Is connected to the cylinder support beam attached to the pedestal, and the outmast is lowered and connected to the pedestal by reducing the hydraulic cylinder, so the weight of the crane body is supported by the pedestal without going through the mast, Do not support the mast or climbing frame with the mast, If I, a state of the jib crane tower type that does not have the climbing equipment.

  Therefore, in this state, the lowermost mast member can be pulled upward by the crane main body jib, and a medium-sized jib crane with a large lifting capacity for removing the lowermost mast member is not required. The number of dismantling cranes can be reduced, and the cost of one dismantling crane can be reduced and the roof dismantling space can be reduced by reducing the dismantling process of the large tower crane.

According to the second aspect of the present invention, a large tower crane of 400 to 600 t · m class installed on the roof is lifted on the roof by the large tower crane, and a jib crane having a working radius of about 25 m is provided. It can be disassembled by two cranes having a small lifting ability that can be hand-rolled (manually disassembled and dismantled) suspended on the roof by this jib crane.

  That is, according to the present invention, in a state where the crane main body is lowered to the position supported by the lowermost mast member, the climbing frame is removed, and the lower end portion of the hydraulic cylinder connected to the climbing frame is used as a base. The mast disassembly process by the jib crane itself, which is connected to the installed cylinder support beam, lowers the outmast by reducing the hydraulic cylinder and connects it to the pedestal. In this state, the lowermost mast member is pulled upward by the jib of the crane body. Therefore, there is no need for a medium-sized jib crane having a large lifting capacity for extracting the lowermost mast member.

  Also, after the lowermost mast member is removed, the jib tip side is disassembled by the jib crane itself, which folds the jib in half and lowers the half of the jib to the floor level by the hoisting wire of the hoisting machine installed in the crane body. Therefore, even a 29m jib that cannot be disassembled by a small crane capable of hand disassembly can be disassembled without using a medium-sized jib crane as an intermediary machine.

Further, after disassembling the tip end side of the jib, the remaining jib is lowered by a hoisting wire of a hoisting device installed in the crane body to a height at which dismantling work can be performed by a small crane capable of hand breaking, and the crane is operated by the small crane After hanging the back stay out of the front stay and back stay constituting the truss having the guide wire for the hoisting wire and the undulating wire installed in the main body, the front stay of the truss is disassembled by the small crane with the hoisting wire And a dismantling process by a small crane that disassembles the remaining jib and truss so that the height is possible, so prior to disassembly of the jib tip side (for example, after removing the mast member at the bottom stage) ) By lifting a small crane on the roof with this jib crane, It can be disassembled jib and trusses and other remaining jib crane components remaining by a small crane, after which a small crane by hand Balazs, can be lowered to the ground by the elevator or the like.

  Therefore, a large tower crane of 400 to 600 t · m class installed on the roof, a jib crane with a working radius of about 25 m with a jib of about 29 m in length, and a crane with a small suspension capacity that can be hand-rolled (can be assembled and disassembled by human power) It is possible to dismantle with two machines.

It is a side view which shows embodiment of this invention and demonstrates the disassembly process of the mast by jib crane itself. It is a side view explaining the state which extracts the lowest mast member. It is a side view explaining the state which lifts a small crane with a jib crane. It is a side view explaining the disassembly process of the jib front end side by the jib crane itself. It is a side view following FIG. It is a side view explaining the dismantling process by a small crane. It is a side view explaining the state which disassembles the back stay of a truss. It is a side view explaining the state which disassembles the front stay of a truss. It is a side view explaining the state which disassembles the remaining jib crane structural member. It is a perspective view of the principal part. It is a side view of the principal part explaining the extraction operation | work of the lowest mast member. It is a side view of the principal part following FIG. It is a side view of the principal part following FIG. It is a side view of the principal part following FIG. It is a side view of the principal part following FIG.

  In FIG. 1, A is a working radius having a 29 m long jib used to dismantle a large climbing tower crane (not shown) of 400 to 600 t · m class of floor climbing system installed on the roof of building B. It is a 25m jib crane. The jib crane A is arranged vertically so as to surround the outside of the mast 2, a pedestal 1 that can be fixed to the frame of the building B, a mast 2 formed by connecting a plurality of mast members 2 a erected on the pedestal 1, and And a crane main body 7 configured to be movable up and down with respect to the mast 2 by a climbing device 6 provided with a hydraulic cylinder 5 for driving up and down arranged between the climbing frame 4 and the climbing frame 4. Has been. Each mast member 2a is set to have a length of 6 m and a weight of about 5 t.

  The pedestal 1 is configured by connecting steel materials in an X shape (see FIG. 10), and is configured to be fixed to a housing (for example, a steel beam) of the building B with bolts and nuts. The crane body 7 is connected to the upper end of the outmast 3 and swivels around the axis of the mast 2, and the undulating jib 9 provided on the swivel 8, the hoisting device 10, the hoisting device 11, the hoisting wire. 10a and a truss (comprised of a front stay 12a and a back stay 12b) 12 having a sheave for guiding the undulating wire 11a, a cab 13 and the like.

  The climbing device 6 alternately engages the mast 2 with hydraulically driven lock pins 14 a and 14 b provided on the outmast 3 and the climbing frame 4, changes the load, and expands and contracts the hydraulic cylinder 5 for raising and lowering driving. By repeating the above, the crane body 7 is configured to move up and down like a scale insect with respect to the mast 2.

  The jib crane A is disassembled through a mast dismantling process by the jib crane itself, a dismantling process on the jib tip side by the jib crane itself, and a dismantling process by a small crane capable of hand breaking.

  The mast disassembling process by the jib crane itself will be described. The procedure is the reverse of the assembly procedure, that is, the crane body 7 is reversely climbed (lowered) along the mast 2 and sequentially from the upper mast member 2a. As shown in FIG. 2, the jib 9 and the winding wire 10a are used to pull out by itself, and the lowest mast member 2a is pulled out by itself as shown in FIG.

  The lowermost mast member 2a is extracted by itself as follows. First, as shown in FIG. 11, the crane body 7 is lowered to a position supported by the lowermost mast member 2a. In this state, the lock pin 14a of the outmast 3 is engaged with the lowermost mast member 2a, and the weight of the crane body 7 is supported by the pedestal 1 via the outmast 3 and the lowermost mast member 2a. Yes.

  In this state, a pair of cylinder receiving beams 15 are attached on the base 1. As shown in FIG. 10, these cylinder receiving beams 15 are mounted on the upper surface of the pedestal 1 so as to be bolted to both horizontal ends 15a, a central portion 15b bent downward in a substantially V shape, and a central portion. It is comprised with the connection part 15c for cylinders provided in 15b. In FIG. 10, reference numeral 16 denotes a mast member connecting portion, and reference numeral 17 denotes an outmast connecting portion, which are provided on the base 1.

  Thereafter, as shown in FIG. 12, the hydraulic cylinder 5 is extended, and the weight of the climbing frame 4 is deposited on the pedestal 1. In this state, the climbing frame 4 is divided as shown in FIG. Remove. Next, the hydraulic cylinder 5 is extended, and the lower end portion of the hydraulic cylinder 5 is connected to the cylinder connecting portion 15 c of the cylinder receiving beam 15 attached to the base 1.

  Thereafter, the engagement between the lock pin 14a of the outmast 3 and the lowermost mast member 2a is released, and the hydraulic cylinder 5 is contracted to lower the outmast 3 as shown in FIG. Connect with bolts and nuts.

  In this state, the weight of the crane body 7 placed on the outmast 3 is supported by the pedestal 1 without the lowermost mast member 2 a, and the outmast 3 and the climbing frame 4 are supported by the mast 2. In other words, it is in the state of a tower crane not having the climbing device 6.

  Therefore, as shown in FIGS. 2 and 15, the lowermost mast member 2a can be pulled upward by itself using the jib 6 and the hoisting wire 10a of the crane body 7.

  Next, as shown in FIG. 3, the maximum suspension capacity 1 that can be manually separated (manually disassembled and dismantled) by the jib crane A whose type has been changed from a climbing crane to a tower crane by removing the mast member 2a at the lowest stage. The small crane C of 1 ton is lifted on the roof and installed near the jib crane A, and then the jib crane itself moves to the jib tip side disassembly process.

  In the disassembly process of the jib tip side by the jib crane itself, as shown in FIGS. 4 and 5, the jib 9 is folded in half, and the tip end side half 9 a of the jib 9 is mounted on the crane body 7. To lower to floor level.

  Specifically, the tip of the winding wire 10a is replaced near the bifold hinge pin (not shown) of the jib 9, and the intermediate portion of the winding wire 10a is wound around the sheave 19 of the bracket 18 provided in the middle of the jib. In this state, the connecting pin (not shown) at the jib intermediate portion is pulled out, the winding wire 10a is drawn out little by little, and the jib 9 is folded in half. After the hinge pin is pulled out, the tip end side of the jib is suspended and the tip sheave 20 is placed horizontally instead of the roller. It is desirable to lay an iron plate 21 on the roof in advance. The jib tip half 9a suspended on the roof is further broken down and suspended on the ground. The work of hanging the disassembled parts on the ground may be performed by the small crane C, and if possible, may be performed by the jib crane A having a shortened jib length.

  Explaining the dismantling process by the small crane C capable of hand breaking, first, the jib remaining by the hoisting wire 11a of the hoisting device 11 mounted on the crane body 7 is lowered to a height at which the small crane C can be dismantled. As shown in FIG. 6, the tip of the winding wire 10 a is connected to the top of the truss 12 through a sheave 22 provided in the middle of the remaining jib. Then, in the state where the remaining jib is held by the winding wire 10a, the undulating wire 11a is removed, and the distal end side of the remaining jib is separated together with the bracket 18 and suspended using the small crane C.

  Thereafter, as shown in FIG. 7, the hoisting device 10 is driven to raise the remaining jib to an appropriate angle (for example, 30 degrees), and the link plate 23 is attached to the turntable 8 so that the remaining jib is inclined at an angle of inclination. After the tension is applied to the hoisting wire 10a, the connecting bolt (not shown) under the back stay 12b of the truss 12 is removed and the top connecting pin (not shown) is suspended and supported by the small crane C. )) And suspend the upper side of the backstay 12b.

  Next, by driving the hoisting device 10 and feeding the hoisting wire 10a while applying tension, the front stay 12a of the truss 12 becomes a height at which the small crane C can be disassembled as shown in FIG. In this way, it is moved backward and is bolted to the lower side of the remaining backstay 12b to hold it in its inclined posture.

  In this state, the winding wire 10a is removed, and the small crane C is used to disassemble and suspend the lower side of the front stay 12a and the back stay 12b of the truss 12.

  Thereafter, as shown in FIG. 9, the small crane C is used to disassemble all the remaining crane components and suspend them on the ground.

  Thus, when the dismantling of the jib crane A is completed, the small crane C is manually handed down, and the components of the small crane C are lowered to the ground by an elevator, so that the dismantling of the large tower crane installed on the roof is completed. It will be.

  According to the above configuration, a 400-600 tom class large tower crane installed on the roof is lifted on the roof by the large tower crane, and a jib crane A having a working radius of about 25 m is provided. Since it can be disassembled by two small cranes C with a maximum lifting capacity of 1.1 tons that can be hand-rolled (manpower can be assembled and disassembled) lifted on the roof by the jib crane A, the dismantling can be done by reducing the dismantling process of the large tower crane It is possible to reduce the cost of one crane and reduce the roof dismantling space.

A Jib crane B Building C Small crane 1 Pedestal 2 Mast 2a Mast member 3 Outmast 4 Climbing frame 5 Hydraulic cylinder 6 Climbing device 7 Crane body 8 Turning base 9 Jib 9a End side half 10 Hoisting device 10a Hoisting wire 11 Hoisting wire 11a 12 truss 12a front stay 12b back stay 13 cab 14a, 14b lock pin 15 cylinder receiving beam 15a both ends 15b central part 15c connecting part for cylinder 16 connecting part for mast member 17 connecting part for outmast 18 bracket 19 sheave 20 tip sheave 21 Iron plate 22 Sheave 23 Link plate

Claims (2)

A pedestal that can be fixed to the building frame, a mast formed by connecting a plurality of mast members erected on the pedestal, an outmast and a climbing frame that are arranged vertically to surround the outside of the mast, and between the two The crane body is configured to be movable up and down with respect to the mast by a climbing device having a hydraulic cylinder for driving up and down arranged in a state where the crane body is lowered to a position supported by the lowest mast member. In the above, the climbing frame is removed, the lower end of the hydraulic cylinder connected to the climbing frame is connected to the cylinder receiving beam attached to the pedestal, and the outmast is lowered by the reduction of the hydraulic cylinder and connected to the pedestal. In this state, the lowermost mast member is configured to be pulled upward by a jib on the crane body. Normal work can be configured as a tower type jib crane in the state,
Small size that can fold the jib in half and lower the half of the jib to the floor level with the hoisting wire of the hoisting machine installed on the crane body, and the remaining jib with the hoisting wire of the hoisting device installed on the crane body. Among the front stay and the back stay constituting the truss having the guide wire for the hoisting wire and the undulating wire mounted on the crane main body by the small crane in a state where the crane is lowered and held at a height where dismantling work by the crane is possible. After hanging down the back stay, the front stay of the truss is moved backward so that it can be dismantled by the small crane with the winding wire connected to the top of the truss, and the remaining jib and truss are removed. In order to perform a series of dismantling processes such as dismantling with a small crane, the bar The lower side of the stay and the upper side of the back stay are connected by a connecting bolt, and when the back stay is suspended, the lower side of the back stay is separated from the upper side so that it can remain, and The jib crane is characterized in that the front stay is configured to be bolted to a lower side of the back stay that remains when the front stay is lowered. A pedestal that can be fixed to the building frame, a mast formed by connecting a plurality of mast members erected on the pedestal, an outmast and a climbing frame that are arranged vertically to surround the outside of the mast, and between the two A jib crane dismantling method comprising a crane body configured to be movable up and down with respect to a mast by a climbing device having a hydraulic cylinder for driving up and down arranged in
In the state where the crane body is lowered to the position supported by the lowermost mast member, the climbing frame is removed, and the lower end of the hydraulic cylinder connected to the climbing frame is connected to the cylinder receiving beam attached to the pedestal. The mast dismantling step by the jib crane itself, in which the outmast is lowered by the reduction of the hydraulic cylinder and connected to the pedestal, and in this state, the lowermost mast member is pulled upward by the jib of the crane body ,
Disassembling the jib tip side by the jib crane itself, folding the jib in half and lowering the half of the jib to the floor level by the hoisting wire of the hoisting machine installed in the crane body,
The jib remaining by the hoisting wire of the hoisting device installed in the crane body is lowered to a height at which dismantling work can be performed by a small crane capable of hand-balancing, and the hoisting wire and hoisting equipped in the crane main body by the small crane After hanging the back stay out of the front stay and back stay that constitute the truss having the wire guiding sheave, the front stay of the truss is lifted up so that it can be disassembled by the small crane with the wire. Demolition process with a small crane to defeat and dismantle the remaining jib and truss
A method for dismantling a jib crane, comprising:

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