JP2012254836A - Mast support structure of tower crane and support method of tower crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mast support structure of a tower crane and a support method of the tower crane capable of suppressing the addition of a vertical force caused by the moment acting on a mast to reduce a vertical setting reaction force, capable of efficiently performing a turning operation of a mast support in a narrow space, and capable of reducing a time and labor by using a pin structure as a support structure for the mast.SOLUTION: The mast support structure of the tower crane has: an upper layer support 10 which supports a vertical load and a horizontal load of the mast 3 arranged at an opening of a frame 2; and a lower layer support which supports only a horizontal load. The upper layer support 10 includes: a pair of second receiving beams 12 which are arranged at both sides of the mast 3 and supported on the frame 2; a spherical support block 13 which is arranged inside the mast 3 and provided with a spherical support 131; a support leg 14 which can be protruded from the spherical support block 13; and a spherical body block 15 has a spherical body 151 which can be fitted freely rotatably to the spherical support 131, and is detachably fixed to the mast 3 whereby the spherical support block 13 provides the mast support structure of the tower crane having such a configuration that horizontal movement with respect to the frame 2 is regulated.

Description

  The present invention relates to a tower crane mast support structure and a tower crane support method.

  Conventionally, in an RC building such as a super high-rise RC apartment building, when a tower crane is installed inside a building and constructed by floor climbing, a base leg or a construction receiving beam is arranged near both ends of the RC beam and bent. The RC beam is prevented from cracking due to the moment, and the load is supported mainly by the shear force.

  Here, in the floor climbing, climbing is performed while changing the support portion at the lower end of the mast to the upper layer in accordance with the building height of the building. Specifically, there is an opening in the building that is large enough to allow the base stand to be lifted from below, and the lifting device is fixed to the top floor under construction and the base stand is placed on the base floor. Release the actuator, operate the hydraulic cylinder of the lifting device to pull up the mast together with the base frame, fix the base frame to the column beam on the middle floor, and use the lifting device to climb the crane body to the top of the mast The building is being built while repeating the steps.

Also, for floor climbing, the mast is supported in two layers, that is, both vertical load and horizontal load are supported at the top of the mast, only horizontal load is supported at the bottom of the mast, and the vertical installation reaction force is lower than conventional towers. For example, Patent Document 1 proposes a method of installing a crane.
In Patent Document 1, moments due to suspended loads and wind loads are processed by the horizontal force of the part where the mast is supported in two layers, and the vertical installation reaction force at the top of the mast is only a load due to its own weight, so that a vertical force due to the moment is not added. It has become the installation method. As a support structure for the upper part of the mast, arm materials are projected from the upper part of the mast to the left and right sides, and vertical loads are supported by these projecting ends.

JP 2010-265107 A

However, the conventional tower crane has the following problems.
That is, in the structure of the tower crane disclosed in Patent Document 1, the vertical load of the mast is supported by the arm material that is rigidly connected to the mast, which is more vertically installed than the conventional tower crane installation method. Although the reaction force can be reduced, there is room for improvement in that respect because the vertical load caused by the moment acting on the mast is added to the vertical installation reaction force of the arm material.

Further, in Patent Document 1, during climbing, a receiving leg attached to the lower part of the lifting device is left on the receiving beam to receive a reaction force, and the mast in the elevator shaft is raised with the arm material of the mast upper layer support part folded. Let The arm material is stretched using the space formed by the support legs by raising it to a predetermined position, and the upper part of the mast is fixed by depositing it on the support beam in the vertical and horizontal directions.
However, the receiving beam is a member that is temporarily necessary for climbing, and it is necessary to install and remove each climbing, and because it is a long object, installation and removal work in a narrow space in the elevator shaft Had the problem of taking time and effort.
In addition, in order to fold and stretch the arm material, there is a problem that a large number of flange bolts are removed and tightened, so that the work efficiency is lowered.

The present invention has been made in view of the above-described problems. By using a pin structure as a support structure for the mast, the application of a vertical force due to a moment acting on the mast is suppressed, and the vertical installation reaction force is reduced. An object of the present invention is to provide a tower crane mast support structure and a tower crane support method.
Another object of the present invention is to provide a mast support structure for a tower crane, which can efficiently perform the work of changing the mast support portion in a narrow space, and reduce labor and time, and a tower crane. It is to provide a support method.

  In order to achieve the above object, the tower crane mast support structure according to the present invention is movable up and down along the mast with the mast disposed in the opening of the housing and the upper part of the mast inserted and supported. A tower crane mast support structure having an upper layer support part that supports vertical and horizontal loads of the mast, and a lower layer support part that supports only the horizontal load. A pair of upper-layer support receiving beams arranged on both sides of the mast and supported by the housing, a ball seat block provided with a ball seat portion on the mast, and protruding from the ball seat block in the horizontal direction. A support leg that is mounted on the upper support beam, a sphere that can be rotatably fitted to the ball seat, and a sphere block that is detachably fixed to the mast. Block It is characterized in that the horizontal movement is restricted for the body.

  In addition, the tower crane support method according to the present invention is a tower crane support method using the mast support structure described above, and supports the horizontal load and the vertical load acting on the mast in the upper-level frame, A step of providing an upper layer support portion that rotatably supports the mast by fitting the ball seat portion and the sphere portion, and a lower layer support portion that supports only the horizontal load acting on the mast are provided on the lower floor below the upper floor. And an upper layer support part and a lower layer support part are sequentially moved together with the change of the mast.

  In the present invention, a horizontal load acting on the mast can be received by the upper layer support portion and the lower layer support portion. Further, the vertical load caused by the tower crane's own weight and the reaction force during the lifting work can be received by the upper layer support portion via the mast. That is, in the upper layer support portion, the support leg portion that protrudes in the horizontal direction from the ball seat block is placed on the upper layer support receiving beam, and the vertical installation reaction force of the mast is applied to the housing via the upper layer support receiving beam. Become.

  The moment generated in the mast can be absorbed by the horizontal support in the upper layer support portion and the lower layer support portion. And since the spherical part is rotatably fitted to the spherical seat part, the mast can be rotated with respect to the casing through the spherical seat block in which movement in the horizontal direction with respect to the casing is restricted. Become. In other words, since the upper layer support portion has a pin structure, it is possible to prevent the vertical force due to the moment acting on the mast from being added to the vertical installation reaction force of the support leg, thereby reducing the vertical installation reaction force. be able to. Therefore, the vertical force received by the upper layer support portion can be reduced, and a simple and downsized support structure can be obtained.

  Further, the support leg portion can project with respect to the ball seat block, and the support to the housing in the upper layer support portion can be released by shrinking the support leg portion and storing it in the ball seat block. When the mast is changed, the ball seat block and the sphere block can be moved upward together with the mast in the storage state of the support leg. Thus, since the support leg portion is provided so as to be extendable and retractable, there is an advantage that a large space is not required when the upper layer support portion is installed, and the installation can be performed in a narrow portion.

  In the tower crane mast support structure according to the present invention, it is preferable that the ball seat block and the sphere block are disposed within the frame of the mast.

  In this case, each of the ball seat block and the sphere block can be arranged in the mast frame, so that these blocks can be moved together with the mast, and the opening area of the opening can be arranged and moved. It is possible to set according to the size.

According to the tower crane mast support structure and tower crane support method of the present invention, the upper layer support portion with respect to the mast has a pin structure, thereby suppressing the addition of vertical force due to the moment acting on the mast, and the vertical installation reaction. The force can be reduced.
In addition, the support leg that supports the upper layer support part to the housing can be protruded with respect to the ball seat block, and when the mast support part is replaced, the support leg part can be accommodated in the ball seat block and transferred. Therefore, the reordering work can be performed efficiently in a small space, and labor and time can be reduced.

It is a side view which shows the whole tower crane structure by embodiment of this invention, Comprising: It is a figure of the state at the time of low-rise floor construction. It is a side view which shows the whole tower crane structure, Comprising: It is a figure of the state at the time of middle-high-rise construction. It is a perspective view which shows the installation state of an upper layer support part and a lower layer support part. It is an enlarged view of the upper layer support part shown in FIG. It is a top view of the upper layer support part shown in FIG. It is an AA arrow directional view shown in FIG. FIG. 6 is a sectional view taken along line B-B shown in FIG. 5. It is CC sectional view taken on the line shown in FIG. (A) is a top view of a lower layer support part, (b) is a side view which shows the driving | running state of a wedge. FIG. 10A is a side view of the lower layer support portion, in which FIG. 9A is a view in a state in which the support leg is projected in the DD arrow view shown in FIG. 9, and FIG. It is a side view of a raising / lowering support part. (A)-(d) is a figure which shows the construction process of the building using a tower crane. (A), (b) is a figure explaining the climbing method of a tower crane. (A)-(c) is a figure explaining the climbing method following FIG.13 (b).

  Hereinafter, a tower crane mast support structure and a tower crane support method according to embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the tower crane 1 according to the present embodiment is installed in a frame 2 of an RC structure such as a super high-rise RC apartment house, for example, and applies a vertical load acting on the mast 3 (that is, vertically downward) The floor climbing is performed together with the construction of the housing 2 while supporting the installation load) and the horizontal load at a predetermined level.

  The opening 9 in which the mast 3 is disposed is an opening that is provided for an elevator shaft and is continuous in the vertical direction. In the present embodiment, a main beam 6 (see FIGS. 5 to 7) and a main column (not shown) ) And the floor slab 8 in a rectangular shape in plan view.

The tower crane 1 includes a mast 3 disposed in the opening 9 and a crane main body 4 that is inserted into and supported by the mast 3 so as to be movable up and down. In the building construction stage, the support system for the mast 3 is different between the low-rise building construction stage, which is the initial construction stage, and the subsequent middle-high construction construction.
Here, the mast 3 is a well-known one that has a quadrangular (square) columnar shape in plan view and extends its height by sequentially adding a mast piece (single mast) of a predetermined length to the upper part.

  At the time of construction of the lower floor, as shown in FIG. 1, a base frame 5 in which the beam is arranged in a substantially cross shape (not shown) in plan view is installed on the floor slab or beam of the base floor F0 of the frame 2 and this base This is a self-supporting system in which the base 5 supports the lower end 3 a of the mast 3.

  At the time of middle / high-rise construction, as shown in FIG. 2, the construction is performed by a support structure in which the mast 3 is supported on the housing 2 by upper and lower two-layer support portions (upper layer support portion 10 and lower layer support portion 20). Specifically, a two-layer support system in which the upper layer support portion 10 supports horizontal loads and vertical loads acting on the mast 3 and the lower layer support portion 20 supports only horizontal loads acting on the mast 3 is employed. That is, the tower crane 1 separates the base mount 5 from the mast 3 when the casing 2 up to a predetermined floor is constructed after assembling, and switches the mast 3 to the support method by the upper layer support portion 10 and the lower layer support portion 20 and then the floor crane 1. It has a structure for climbing (see FIG. 3).

  As will be described in detail later, when climbing and rearranging the mast 3, a lifting support portion 30 (see FIG. 11) that can be connected to a part of the upper layer support portion 10 is used.

As shown in FIG. 1 and FIG. 2, the crane body 4 includes an elevating device 41 that can be moved up and down along the mast 3, a swivel base 42 fixed to the upper portion of the elevating device 41, and a swivel base 42. A lifting device 43 which is fixed and equipped with a lifting machine such as a jib is schematically constituted. The elevating device 41 includes a pair of upper and lower detachable frames that can be locked to the mast 3 by attaching and detaching a lock pin (not shown), and an elevating jack (not shown), and the pair of detachable frames are alternately arranged with respect to the mast 3. The crane body 4 is climbed by extending and retracting the lifting jack while being fixed to or released from the crane.
A gantry 44 is provided on the detachable frame below the lifting device 41. The gantry 44 can be fixed to the housing 2 (the main beam 6 or the like) when the mast 3 is lifted by applying a reaction force to the crane body 4.

Next, the structure of the upper layer support part 10 which supports the vertical load and horizontal load which act on the mast 3 is demonstrated based on drawing.
As shown in FIG. 3, the upper layer support portion 10 is disposed on a predetermined floor (hereinafter, referred to as “upper layer support floor P <b> 1”) at a substantially intermediate portion in the vertical direction of the mast 3. The support is taken (see FIG. 1), and the horizontal load and the vertical load acting on the mast 3 are supported.
4 and 5, the material axis direction of the main beam 6 that receives the support of the upper layer support portion 10 is defined as a first direction X, and the direction orthogonal to the first direction X in plan view is defined as a second direction Y. This will be described below.

  As shown in FIGS. 4 and 5, the upper layer support portion 10 is unidirectionally (in this case, the second direction Y) so as to bridge the pair of permanent beams 6 and 6 (the frame 2) on both sides of the mast 3. A pair of first receiving beams 11, 11 extending, a pair of second receiving beams 12, 12 (upper layer support receiving beams) arranged in the first direction X on the first receiving beams 11, 11, and the mast 3 A ball seat block 13 provided with a ball seat portion 131, and a second receiving beam that can project in the second direction Y from the ball seat block 13 toward the second receiving beams 12 and 12 respectively. 12 and 12, a support leg portion 14 that is locked onto the ball seat portion 131, a sphere portion 151 that is rotatably fitted to the ball seat portion 131, and a sphere block 15 that is fixed to the mast 3. Has been.

  The pair of first receiving beams 11, 11 are arranged in parallel with each other on both sides of the mast 3, and both ends are fixed on the main beam 6 by anchor bolts or the like. The pair of second receiving beams 12, 12 are arranged in parallel with each other on both sides of the mast 3, and both ends are placed on the first receiving beam 11. Although not particularly shown, the second receiving beam 12 is disposed in a state in which movement in the horizontal direction is restricted at least with respect to the first receiving beam 11.

  As shown in FIGS. 6 to 8, the ball seat block 13 has a box shape, is disposed substantially coaxially with the mast 3 inside the frame material of the mast 3, and is moved to a predetermined position in the vertical direction of the mast 3. It is provided as possible. The ball seat block 13 has a ball seat portion 131 in which a concave curved surface that is recessed downward is formed at the center of the upper surface. On both side surfaces 13a, 13a facing the second receiving beam 12 of the ball seat block 13, support leg portions that can be expanded and contracted in a direction (second direction Y) orthogonal to the material axis direction of the second receiving beam 12 respectively. 14 and 14 are provided.

  The support leg 14 is formed of a steel material having a rectangular shape in cross section. For example, the ball seat block 13 can be moved forward and backward in the material axis direction (second direction Y) by a hydraulic or electric extension jack (not shown). Equipped with. The support leg 14 protrudes outward from the outer frame of the mast 3 and is placed on the second receiving portion 12 in a state of protruding from the side surface 13 a of the ball seat block 13. Therefore, the load acting on the ball seat block 13 is transmitted to the second receiving beam 12 via the support leg 14.

As shown in FIGS. 4 and 5, on the second receiving beam 12, the first locking plate 16 </ b> A for restricting the movement of the support leg 14 in the first direction X and the movement in the second direction Y are provided. A second locking plate 16B to be regulated is provided. The first locking plate 16A is L-shaped steel, and the first side portion forming one side of the L shape is formed on the side surfaces 14a and 14a on both sides of the support leg portion 14 locked on the second receiving beam 12. Similarly, the second side portion that forms the other side of the L-shape is fixed to the second receiving beam 12 with a bolt (see FIG. 6). Thereby, the support leg 14 is clamped from the both side surfaces 14a by the first locking plate 16A in a state of being locked on the second receiving beam 12.
The second locking plate 16B is L-shaped steel, and the first side portion is in contact with the end surface 14b in the expansion / contraction direction (second direction Y) of the support leg portion 14 locked on the second receiving beam 12. Thus, the second side portion is fixed to the second receiving beam 12 with a bolt.

As shown in FIGS. 6 to 8, the spherical block 15 includes a support portion 152 that is detachably fixed to the chord 31 of the mast 3, and a ball seat portion of the ball seat block 13 below the support portion 152. And a spherical portion 151 that is rotatably engaged with 131. The spherical block 15 can be tilted within a range of an inclination angle θ (for example, 1 degree) shown in FIG. 7 set with respect to the spherical seat block 13 by rotating the spherical portion 151 within the spherical surface of the spherical seat 131. is there. That is, in the upper layer support portion 10, the mast 3 fixed to the spherical block 15 has a pin structure that is rotatably supported with respect to the spherical seat block 13. The ball seat portion 131 and the sphere portion 151 are provided coaxially with the mast 3.
Thus, the vertical load of the mast 3 is supported by the sphere engaging portions of the ball seat block 13 and the sphere block 15, and the vertical load is supported by the ball seat block 13, the sphere block 15, the support leg 14, and the second receiving beam. 12 and transmitted to the frame 2 via the first receiving beam 11.

Next, the structure of the lower layer support part 20 which supports a horizontal load with the lower part 3a of the mast 3 is demonstrated based on drawing.
As shown in FIG. 3, the lower layer support unit 20 takes a reaction force from the lower part 3 a of the mast 3 to the frame 2 of a predetermined floor (hereinafter, the floor on which the lower layer support unit 20 is installed is referred to as “lower layer support floor P <b> 2”). It is for supporting horizontally and receiving a moment (horizontal load) acting on the mast 3.

  As shown in FIG. 9A and FIG. 10, the lower layer support portion 20 is provided with a frame 21 that is framed in a square shape in plan view so as to surround the periphery of the mast 3. Support legs 22 are provided which can project from the horizontal direction in one direction (here, the second direction Y).

  On the inner corner side of each corner portion of the frame 21, a wedge 23 is driven from above into a gap between the outer surface of the mast 3 (see FIG. 9B). FIG. 9B shows a state before the wedge 23 is driven. The wedges 23 support the lower layer support 20 with respect to the mast 3 in a state where movement in the horizontal direction is restricted, and only the horizontal force of the mast 3 is transmitted to the housing 2 via the frame 21 and the support legs 22. It is the composition which becomes.

  The support leg 22 is connected by a hinge 24 provided at the upper end edge of the frame 21, and can be rotated in a direction rotating around a horizontal rotation axis by the hinge 24. The range of rotation of the support leg 22 is as shown in FIG. 10 (a), from the horizontal position of the support leg 22 (the position protruding outside the frame 21) to the frame 21 in plan view as shown in FIG. 10 (b). It is a position accommodated inside. That is, the lower layer support portion 20 can be locked onto the housing 2 that forms the opening 9 when the support leg 22 is in the overhanging position, and the lower layer support portion 20 is supported by rotating the support leg 22 around the hinge 24 and folding it. The size can be changed so that the portion 20 can pass through the opening 9.

  Further, a rib 22 a that can be bolted to the housing 2 protrudes laterally from the support leg 22. Here, the lower layer support portion 20 is fixed to the housing 2 via blocks 25A and 25B having appropriate dimensions corresponding to the height of the housing 2. Specifically, the ribs 22a of the support legs 22 are fixed on the blocks 25A and 25B by bolts.

  In the lower layer support portion 20 configured as described above, when the support legs 22 are projected on the outside of the frame 21 and fixed on the housing 2, and when the mast 3 is relocated and relocated, all the support legs 22 are folded. Thus, the inside of the opening 9 can be moved while being accommodated on the frame 21.

Next, the raising / lowering support part 30 used at the time of the change of the mast 3 is demonstrated concretely.
As shown in FIG. 11, the elevating support portion 30 is a support structure when the crane body 4 is raised and lowered, and is supported using the upper layer support portion 10.
The elevating support part 30 bridges the pair of first receiving legs 31 fixed so as to bridge on the pair of second receiving beams 12, 12 of the upper layer supporting part 10, and the first receiving legs 31. And a pair of second receiving legs 32 connected to the lower end 4 a of the crane body 4. The elevating support portion 30 can take a reaction force when re-moving the crane main body 4 to move above the mast 3 in a state where the crane body 4 is fixed to the housing 2 (the main beam 6 or the like).

  Next, a climbing method using the tower crane 1 having the above-described configuration and a mast support method using the upper layer support unit 10 will be described in detail.

As shown in FIG. 1 and FIG. 2, the climbing method by the tower crane 1 is different in the method of supporting the mast 3 when the low-rise building is constructed and when the middle and high-rise building is constructed. At the time of construction of the lower floor, as shown in FIG. 1, the base frame 5 is installed on the basic floor F0, and the mast 3 is erected on the base frame 5 and the tower crane 1 is installed in a self-supporting manner as before. To do.
At the time of construction of the middle and high floors, the lower part 3a of the mast 3 is separated from the base gantry 5, and as shown in FIGS. 2 and 3, the upper and lower direction substantially middle part of the mast 3 is supported by the upper layer support part 10 on the upper layer support floor P1, The lower part 3a of the mast 3 is fixed to the lower support floor P2, and the positions of the upper support 10 and the lower support 20 are sequentially moved to the upper floor according to climbing.

  Specifically, as shown in FIGS. 1 and 12 (a), the base gantry 5 is fixed to a predetermined position on the base floor F0 of the housing 2 by an anchor or the like, and the mast 3 is made independent on the base gantry 5. The crane main body 4 is installed above the mast 3 (step S1). In this state, as shown in FIG.12 (b), the housing 2 to the hierarchy which can be constructed is completed (step S2). The mast 3 is arranged so as to be in the opening 9 of the housing 2.

Next, as shown in FIG.12 (c), in step S3, the crane main body 4 is once lowered | hung, and the lower frame 2 (RC strength) from the uppermost floor under construction by the raising / lowering support part 30 shown in FIG. The mast 3 is lifted by the lifting device 41 (see FIG. 2) by taking a reaction force on the beam or floor slab (where sapphire has developed).
That is, after the base frame 5 is separated and removed from the mast 3 in advance, the mast 3 is supported by the upper layer support unit 10 on the middle floor (upper support floor P1), and the mast 3 is supported by the lower layer support section 20 on the lower support floor P2. To support. Then, the crane main body 4 is raised along the mast 3 and stopped at a predetermined position, and the crane main body 4 extends and extends a new mast 3 to the upper part of the mast 3 by a necessary number. Then, as shown in FIG.12 (d), the housing 2 is constructed | assembled, performing floor climbing, changing the upper layer support part 10 and the lower layer support part 20 in order (step S4).

  When the crane body 4 is refilled, as shown in FIG. 1, a lifting jack (not shown) provided in the lifting device 41 is extended to raise a guide frame (not shown) of the lifting device 41 to mast. Fix to 3. Then, the jack frame (not shown) is released from the mast 3, the lifting jack is contracted to raise the jack frame, and the jack frame is fixed to the mast 3. Thereby, the reordering for one stroke is completed. By repeating such a reordering operation, the crane body 4 can be raised as shown in FIGS.

  Next, the climbing method from step S3 to step S4 described above will be described in more detail with reference to FIGS.

  Next, in step S11 of FIG. 13 (a), after the building 2 is constructed up to the highest floor where construction can be performed at the current mast position, the next lower floor (this is the first upper support floor P1a). The first upper layer support portion 10a is provided. The first upper layer support portion 10a is located above the second upper layer support portion 10b of the second upper layer support floor P1b provided earlier in the lower layer.

  As shown in FIGS. 4 to 8, the first upper layer support portion 10 a fixes a pair of first receiving beams 11, 11 to the housing 2 (main beam 6), and a pair on the first receiving beam 11. And the ball seat block 13 and the ball block 15 are arranged with the ball seat portion 131 and the ball portion 151 being fitted inside the mast 3 located on the first upper layer support floor P1a. Established. Then, support leg portions 14 are projected from both side surfaces 13 a of the ball seat block 13, and the support leg portions 14 are placed on the second receiving beam 12. At this time, the support leg portion 14 is in a state where movement in the horizontal direction is restricted by the first locking plate 16A and the second locking plate 16B provided on the second receiving beam 12. The support leg 14 is fixed by, for example, a pin material (not shown) penetrating the ball seat block 13 and the support leg 14 to restrain the support leg 14 from contracting.

  Thereafter, as shown in FIG. 13 (b), the crane body 4 is lowered and the lifting support mechanism 30 (see FIG. 11) fixed to the lower end 4a of the crane body 4 is supported on the first upper layer support floor P1a. Connect to the unit 10a (step S12).

  Next, in step S13 shown in FIG. 14 (a), as shown in FIGS. 4 to 8, the support leg portion 14 of the second upper layer support portion 10b installed on the second upper layer support floor P1b is contracted to form a ball. It is accommodated in the seat block 13 and the ball seat block 13 and the spherical block 15 are raised together with the mast 3 while taking the reaction force of the crane body 4 by the lifting support mechanism 30 to perform the refilling.

  And if the raising of the mast 3 is completed, as shown in FIG.14 (b), of the 2nd lower layer support part 20a in the 1st lower layer support floor P2a moved from the 2nd lower layer support part 20b of the 2nd lower layer support floor P2b. The wedge 23 is inserted between the mast 3 and the horizontal load acting on the mast 3 is horizontally supported, and the support leg portion 14 is projected from the ball seat block 13 transferred integrally with the mast 3 to be placed on the second receiving beam 12. (Step S14). Accordingly, the transferred first upper layer support portion 10a can support the horizontal load and the vertical load acting on the mast 3, and the first lower layer support portion 20a can support only the horizontal load acting on the mast 3.

  Subsequently, in step S15 shown in FIG. 14C, the first upper layer support portion 10a and the lifting support portion 30 are detached, and the crane body 4 is moved along the mast 3 raised by the lifting device 41 (see FIG. 2). The floor climbing is completed. A building can be constructed by sequentially repeating the floor climbing steps from step S11 to step S15 shown in FIGS.

  Thus, in the tower crane 1, a horizontal load acting on the mast 3 can be received by the upper layer support portion 10 and the lower layer support portion 20. Moreover, the upper layer support part 10 can receive the vertical load by the reaction force at the time of the dead weight of the tower crane 1 and a suspended load work via the mast 3. That is, in the upper layer support portion 10, the support leg portion 14 that protrudes in the horizontal direction from the ball seat block 13 is placed on the second receiving beam 12, and the mast is interposed via the second receiving beam 12 and the first receiving beam 11. The vertical installation reaction force 3 is applied to the housing 2.

  Further, the vertical force due to the moment generated in the mast 3 can be absorbed by the horizontal support in the upper layer support portion 10 and the lower layer support portion 20. Since the spherical portion 151 is rotatably fitted to the spherical seat portion 131, the mast 3 is attached to the casing 2 via the spherical seat block 13 in which movement in the horizontal direction with respect to the casing 2 is restricted. It becomes possible to rotate. In other words, since the upper layer support portion 10 has a pin structure, it is possible to suppress the vertical force due to the moment acting on the mast 3 from being added to the vertical installation reaction force of the support leg 14, so that the vertical installation reaction force Reduction can be achieved. Therefore, the vertical force received by the upper layer support portion 10 can be reduced, and a simple and downsized support structure can be obtained.

  Moreover, the support leg part 14 can protrude with respect to the ball seat block 13, and the support with respect to the housing 2 in the upper layer support part 10 is cancelled | released by shrink | contracting the support leg part 14 and accommodating in the ball seat block 13. Can do. When the mast 3 is refilled, the ball seat block 13 and the sphere block 15 can be moved upward together with the mast 3 in the accommodated state of the support legs 14. Thus, since the support leg part 14 is provided so that expansion-contraction is possible, when installing the upper layer support part 10, a large space becomes unnecessary and there exists an advantage that the installation in a narrow site | part is attained.

  Furthermore, since the center of rotation of the ball seat 131 and the sphere 151 is located on the central axis of the mast 3, the bending moment of the mast 3 acts on the fitting portion between the ball seat 131 and the sphere 151. Therefore, the vertical force due to the moment acting on the mast 3 can be reliably suppressed from being added to the vertical installation reaction force of the support leg 14.

  Furthermore, since each of the ball seat block 13 and the sphere block 15 can be disposed within the frame of the mast 3, these blocks 13, 15 can be moved together with the mast 3, and the opening area of the opening 9 can be reduced. Can be set in accordance with the movable size of the mast 3.

  Further, in the present embodiment, as shown in FIG. 11, the third receiving beam 31 of the lifting support portion 30 can be installed on the second receiving beam 12 that supports the support leg portion 14. There is an advantage that a dedicated receiving beam is not required for the elevating support portion 30.

As described above, in the tower crane mast support structure and tower crane support method according to the present embodiment, the upper layer support portion 10 with respect to the mast 3 has a pin structure, so that a vertical force is applied due to a moment acting on the mast 3. It is possible to suppress the vertical installation reaction force.
In addition, the support leg portion 14 that supports the upper layer support portion 10 on the housing 2 is allowed to protrude with respect to the ball seat block 13, and the support leg portion 14 is accommodated in the ball seat block 13 when the mast support portion is replaced. Therefore, the reordering work can be performed efficiently in a small space, and labor and time can be reduced.

As mentioned above, although the embodiment of the mast support structure of the tower crane and the support method of the tower crane according to the present invention has been described, the present invention is not limited to the above embodiment, and does not depart from the spirit thereof. It can be changed as appropriate.
For example, in the present embodiment, the first receiving beam 11 is arranged on the housing 2 and the second receiving beam 12 is provided so as to bridge the first receiving beam 11. It is also possible to adopt a configuration in which the is placed directly on the housing 2.
In the present embodiment, as a method of restricting the movement of the support leg 14 in the horizontal direction with respect to the second receiving beam 12, the first locking plate 16A and the second locking plate 16B made of L-shaped steel are used. Although used, it is not limited to this, and members such as H-shaped steel and C-shaped steel may be used.

Furthermore, the structure of the lower layer support portion 20 is not limited to the present embodiment. For example, although the support leg 22 can be rotated to be freely extended with respect to the frame 20 via the hinge 24, a structure without such a folding-type extension mechanism may be used.
In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Tower crane 2 Frame 3 Mast 4 Crane main body 5 Base mount 6 Main beam 8 Floor slab 9 Opening part 10 Upper layer support part 11 1st receiving beam 12 2nd receiving beam (upper layer support receiving beam)
DESCRIPTION OF SYMBOLS 13 Ball seat block 14 Support leg part 15 Sphere block 16A 1st latching plate 16B 2nd latching board 20 Lower layer support part 21 Frame 22 Support leg 23 Wedge 24 Hinge 30 Lifting support part 41 Lifting device P1 Upper layer support floor P2 Lower layer support Floor X First direction Y Second direction

Claims (3)

A mast disposed in the opening of the housing, and a crane body that is movable up and down along the mast in a state where the upper portion of the mast is inserted and supported, and a vertical load and a horizontal load of the mast. A tower crane mast support structure having an upper layer support part to support and a lower layer support part to support only a horizontal load,
The upper layer support is
A pair of upper-layer support receiving beams arranged on both sides of the mast and supported by a housing;
A ball seat block provided with a ball seat portion disposed on the mast;
A support leg that can protrude in a horizontal direction from the ball seat block, and whose protrusion is placed on the upper support beam;
A sphere block that is rotatably fitted to the ball seat portion, and a sphere block that is detachably fixed to the mast;
With
A mast support structure for a tower crane, wherein the ball seat block is restricted in horizontal movement with respect to the housing.   2. The tower crane mast support structure according to claim 1, wherein the ball seat block and the sphere block are disposed in a frame of the mast. A tower crane support method using the mast support structure according to claim 1 or 2,
A step of providing an upper layer support portion for supporting a horizontal load and a vertical load acting on the mast, and supporting the mast rotatably by fitting the ball seat portion and the sphere portion, in an upper floor case;
In the lower floor below the upper floor, a step of providing a lower layer support that supports only the horizontal load acting on the mast;
Have
A method for supporting a tower crane, wherein the upper layer support portion and the lower layer support portion are sequentially moved along with the change of the mast.

Images