JP2009091123A - Crane for steel tower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crane for an steel tower capable of being easily connected to the steel tower even if a projection such as a ladder is present on the facing surface of the steel tower to a mast, and increasing the degree of freedom of setting a distance of the mast from the steel tower. <P>SOLUTION: This crane for an steel tower is provided with mast holders 51A and 51B detachably arranged between intermediate parts of the mast 21 and the steel tower 1 in process of construction or in process of dismantlement, and supporting the intermediate parts of the mast 21. Each the mast holders 51A and 51B is provided with: a basic beam 52 having a length not shorter than the facing surface width of the steel tower 1 at the mast side; distance keeping frames 51A and 51B interposed between right and left columns 2A at the facing surface side to the mast 21 of the steel tower 1 in process of construction or in process of dismantlement, and the basic beam 52; and three or more support rods 69, 70 and 75 connected to a member having a base end side attached to the basic beam 52 and a front end side connected to the mast 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a steel tower crane that is preferably used to construct and dismantle a steel tower such as a radio tower.

  In general, a transmission line tower used to construct a transmission line, a radio tower that serves as a relay base for radio waves transmitted to and received from a mobile phone, etc., are constructed by successively connecting a number of steel tower components that form a framework structure in the height direction. Therefore, it is configured with a large ground height.

  For this reason, large-scale hydraulic cranes with large lifts are required when constructing transmission line towers, radio towers, etc., but for example in urban areas where houses are densely populated, narrow places such as roadside belts, and mountainous areas. In many cases, it is difficult to construct a steel tower using such a large hydraulic crane.

  For this reason, a steel tower crane that is suitably used for construction and dismantling of a steel tower in a place where it is difficult to carry in a large hydraulic crane is known. This steel tower crane is usually placed inside the steel tower and is in the height direction. The mast is generally composed of a mast extending to the upper end of the mast and a working device for lifting work provided on the upper end side of the mast so that one mast is composed of a plurality of joint masts each having a height of about 4 m. Has been.

  Here, when constructing a steel tower using the above-mentioned steel tower crane, a mast having a low ground height is assembled by connecting two to three joint masts, and a work device is attached to the upper end side of the mast. Then, the steel tower is gradually assembled by successively connecting the steel tower structure suspended by using this working device around the mast in the height direction. Then, by connecting the next joint mast to the lower end side of the mast, the mast is raised according to the ground height of the steel tower to be assembled. Furthermore, a steel tower structure is continuously connected on the steel tower in the middle of assembly using this raised mast.

  In this way, a large number of splicing masts are sequentially arranged to extend the entire mast, and a large number of steel tower constituents are successively arranged using a working device attached to the mast, so that an urban area, a road It is possible to construct a steel tower having a large height above the ground even in a narrow place such as a roadside belt or a mountainous area. And at the time of construction of this steel tower, the stability of the steel tower crane is ensured by connecting the middle part of the extending mast to the steel tower under construction using a wire rope or the like.

  By the way, the transmission line tower is larger than the radio tower for installing the transmission line, and it is possible to secure a sufficient space for placing the mast of the above-described tower crane inside the transmission line tower. it can.

  However, radio towers, etc., have a narrower space between support columns than transmission line towers, so it is not possible to place a mast of a steel tower crane inside the radio tower. There is a problem that it is difficult to construct.

  Therefore, an external tower crane with a mast installed so that relatively small steel towers such as radio towers can be safely constructed in urban areas, narrow places such as roadside zones, and mountainous areas. There is.

  As this external steel tower crane, a mast called a pedestal is set up outside the steel tower, and this pedestal is connected to and supported by the steel tower by a wire, and the member is lifted by a working device attached to the top of the pedestal. Is. However, those using this pedestal have a weak supporting force and it is difficult to construct a relatively large steel tower.

In order to solve such a problem, the present applicant, in Patent Document 1, a base mast installed on the side of a steel tower constructed by sequentially connecting a number of steel tower components in the height direction, and , A plurality of joint masts are successively arranged in the height direction, and the joint mast on the lowermost end side can be turned on the mast supported by the base mast, and can be turned on the upper end side of the mast via a turning device A working device for suspended load work, a first mast holder provided between the base mast and a steel tower under construction, and supporting the base mast; a part of the mast and a steel tower under construction; A second mast holder that is provided between the masts and supports a middle portion of the mast is proposed. In this patent document 1, as a mast holder, a basic beam having a length capable of covering the width of the surface facing the mast of the steel tower is connected and fixed to the steel tower, and the basic beam and a mast guide attached to the mast are connected by a support rod. Has been disclosed.
JP 2002-356297 A

  When the mast holder that connects the steel tower and the mast is composed of a basic beam that is fixed to the steel tower and a support rod that is connected to the basic beam and the mast or base mast as described in Patent Document 1, the mast holder faces the mast in the steel tower. When a protruding member such as a ladder is attached to the surface, the protruding member obstructs the mounting of the basic beam, and there is a problem that the basic beam cannot be mounted.

  In addition, it is possible to adjust the distance of the mast to the tower by making the length of the support rod adjustable, but this adjustment range is limited to the adjustment range of the length of the support rod. is there. Also, when the inclination angle of the tower pillar is large, the distance between the mast and the tower standing vertically differs greatly between the high part and low part of the tower, so it becomes impossible to respond to this difference in the distance by the expansion and contraction of the support rod. There is a problem that it is necessary to manufacture a basic beam and a support rod for each steel tower. Such a problem also occurs when a steel tower crane is used for steel tower dismantling.

  In view of the above problems, the present invention enables easy connection to a steel tower even when a protrusion such as a ladder is present on the surface of the steel tower facing the mast, and allows freedom in setting the interval between the mast and the steel tower. The purpose is to provide a crane for demolition of a steel tower. It is another object of the present invention to provide a crane for demolition of a steel tower that can make the members constituting the mast holder common and economical for the construction and dismantling of a steel tower with an inclined column.

The crane for a steel tower according to claim 1 is a mast configured by sequentially connecting a number of joint masts in the height direction;
A working device for hanging work provided on the upper end side of the mast so as to be capable of turning via a turning device;
In a crane for a tower equipped with a mast holder that is detachably provided between a midway part of the mast and a steel tower in the middle of construction or dismantling, and supporting the midway part of the mast,
The mast holder is a basic beam having a length equal to or greater than the facing width on the mast side of the steel tower,
An interval holding frame that is detachably interposed between the left and right struts facing the mast in the steel tower during construction or dismantling, and the basic beam,
A base end side is attached to the basic beam, and a distal end side is provided with three or more support rods detachably connected to a mast guide attached to the mast.

The crane for steel tower construction dismantling according to claim 2 is the steel tower crane according to claim 1, comprising a plurality of sets of the basic beam, the interval holding frame, and the support rod.
The basic beam and the support rod have a common structure and size for each set;
The interval holding frames of the respective sets are characterized in that at least some of the sets have different lengths in the facing direction of the tower, depending on the difference in height of the attachment portions.

The crane for steel towers according to claim 3 is the crane for steel towers according to claim 1 or 2.
The basic beam has three or more bolt insertion holes that allow the coupling position in the length direction of the basic beam by the bolts of the spacing frame to be changed.

The crane for steel tower construction dismantling of Claim 4 is the crane for steel towers of any one of Claim 1 to 3.
A detachable abutment plate having a contact surface corresponding to the shape of the left and right pillars of the steel tower is provided between the interval holding frame and the steel tower.

The crane for steel tower construction dismantling of Claim 5 is the crane for steel towers of any one of Claim 1 to 4.
In the same set, the interval holding frame is different in length in the tower facing direction of the interval holding frame attached to the left column and the interval holding frame attached to the right column, and the opposing surfaces of the mast and the tower are different from each other. It is characterized by being installed non-parallel.

  According to the first aspect of the present invention, since the mast holder that connects the tower and the mast is provided with the interval holding frames interposed between the left and right pillars of the tower and the basic beam, Even when a protrusion such as a ladder is provided on the base, the basic beam can be attached while avoiding the protrusion. In addition, by preparing various lengths of the interval holding frame facing the steel tower, the degree of freedom in setting the distance between the mast and the steel tower is increased, and it is possible to set the distance suitable for the situation at the site. It becomes.

  According to the invention of claim 2, the basic beam and the support rod have a common structure and size for each set, and the interval holding frame of each set is in accordance with the difference in the height of the attachment site, Since at least some of the sets have different lengths in the opposite direction of the tower, the basic beam and the support rod can be shared for a plurality of sets, so that manufacturing costs can be reduced and different types of towers can be used. On the other hand, the basic beam and the support rod can be used together, and economy can be achieved.

  According to the third aspect of the present invention, the number of mounting holes that allow the base beam to be changed in the longitudinal direction by the bolts of the spacing frame are provided in the basic beam. Can be easily applied. Further, when the tower column has an inclination, it can be easily handled by changing the attachment position of the interval holding frame attached to the base beam at a place having a different height.

  According to the invention of claim 4, since the detachable abutment plate having a contact surface corresponding to the shape of the left and right columns of the tower is provided between the space holding frame and the tower, By using the abutment plate adapted to the structure, the interval holding frame can be firmly fixed to the support column.

  According to a fifth aspect of the present invention, in the same set, the interval holding frame is different in the length in the tower facing direction between the interval holding frame attached to the left column and the interval holding frame attached to the right column, and the mast Since the opposing surface of the steel tower and the steel tower can be installed non-parallel, the degree of freedom in the relative orientation of the steel tower and the mast is increased, and the mast can be installed at a suitable position on the site. Become.

  FIG. 1 is a side view showing an embodiment of a crane for a steel tower according to the present invention in a state where a steel tower is being constructed. Reference numeral 1 denotes a radio tower constructed by the crane 11 of the present invention. The radio tower 1 serves as a relay base for radio waves transmitted to and received from, for example, a mobile phone. 2,... Are sequentially arranged in the height direction. The radio tower 1 is erected on a concrete base 3 made of concrete or the like laid on the ground, and an antenna (not shown) is attached to the upper end side thereof, so that the ground height reaches about 50 m. .

  Here, the tower structure 2 constituting the radio tower 1 includes three support pillars 2A made of a pipe material extending in the height direction, a horizontal beam 2B and an inclined beam 2C made of a pipe material connecting the support pillars 2A. Thus, it is formed with a substantially triangular frame structure when viewed from above. Then, between the flanges provided at the ends of each column 2A, the upper and lower columns 2A are fastened using bolts (both not shown), and the horizontal beam 2B and the inclined beam are also formed between the three columns 2A. By similarly fastening by 2C, it has the structure which connects each steel tower structure 2 sequentially in the height direction.

  The tower crane 11 according to the present embodiment includes a base mast 12, a mast 21, a work device 23, mast holders 51A and 51B, and the like.

  The base mast 12 is erected on a base frame 13 laid on the ground adjacent to the gantry 3 of the radio tower 1 and supports the lower end side of the mast 21. As shown in FIGS. 2 and 3, the base mast 12 has a substantially rectangular parallelepiped shape by four struts 12A extending in the height direction and a plurality of transverse beams 12B and inclined beams 12C connecting the struts 12A. It is configured with a frame structure. The inside of the base mast 12 serves as a mast accommodating portion that accommodates the lower end side of the mast 21. A guide roller (not shown) that allows the mast 21 to move in the height direction and restricts the movement in the horizontal direction is provided in the mast accommodating portion. And the lower end part of the base mast 12 is firmly fixed to the base frame 13 using an anchor bolt (not shown) or the like.

  Reference numeral 17 denotes a rope winch as a mast lifting device provided on the base mast 12, and the rope winch 17 is fixed to the lower end side of the base mast 12. The proximal end side of the wire rope 18 is wound around the rope winch 17, and the distal end side of the wire rope 18 is wound around a sheave 19 that is rotatably provided on the upper end side of the base mast 12, and is on the base frame 13 side. And is connected to the lower end of the mast 21 housed in the base mast 12. The mast 21 is configured by connecting a plurality of joint masts 22 in the height direction.

  Then, by winding the wire rope 18 with the rope winch 17, the lower end side of the mast 21 is lifted from the base frame 13, and a space for inserting the next joint mast 22 to be added to the mast 21 is provided in the base mast 12. It has a configuration that can be secured.

  Reference numeral 20 denotes a joint mast insertion device provided on the base mast 12 together with the rope winch 17. The joint mast insertion device 20 is rotatably attached to the base mast 12, and is positioned at a position shown by a hydraulic cylinder or the like (not shown). 3 to the base mast 12 in the direction of arrow A in FIG. Then, the joint mast insertion device 20 places the next joint mast 22 to be added on the lower end side of the mast 21 and moves the base mast 12 to the base mast 12 side with the rope winch 17 lifting the lower end side of the mast 21 as described above. And the inserted joint mast 22 is inserted into the base mast 12. A surface of the base mast 12 on the side where the joint mast insertion device 20 is installed is opened to insert and eject the connecting mast 22 into the base mast 12.

  Here, each joint mast 22 constituting the mast 21 is composed of four support columns 22A extending upward and downward, and a plurality of transverse beams 22B and inclined beams 22C connecting the support columns 22A. It is formed with a rectangular parallelepiped frame structure that is slightly smaller than the height, and has a height dimension of about 4 m, for example.

  The joint mast 22 located on the lowermost side of the mast 21 is accommodated in the base mast 12 and is prohibited from moving in the horizontal direction by a guide roller (not shown) provided in the base mast 12. It is supported so as to be movable only in the height direction. Further, the lowermost end side of the mast 21 is in contact with the base frame 13, and is configured to receive a load from the mast 21 and a work device 23 described later attached to the mast 21 by the base frame 13.

  Reference numeral 23 denotes a working device for a suspended load attached to the upper end side of the mast 21 via a swivel device 24. The working device 23 includes an A-type frame 25, a jib 26, a suspended load hook 34, and the like. Has been. The work device 23 is operated by, for example, a remote control device (not shown), and performs the work of assembling the steel tower 1 by lifting and sequentially connecting a number of steel tower structures 2.

  Reference numeral 25 denotes an A-type frame provided on the turning device 24, and the A-type frame 25 supports the base end side of the jib 26 forming a framework structure so as to be able to move up and down. The A-type frame 25 is provided with a undulation winch 27 and a hoisting winch 28, and a undulation rope 29 is wound around the undulation winch 27.

  Here, a jib hanger 30 is attached to the upper end side of the A-type frame 25, and a undulating rope 29 is wound between the jib hanger 30 and the jib bridle 31, and the tip side of the jib bridle 31 and the jib 26 is a pendant. They are connected by a rope 32. Therefore, when the hoisting rope 29 is wound and unwound by the hoisting winch 27, the distance between the jib hanger 30 and the jib bridle 31 is changed, and the jib 26 is raised and lowered via the pendant rope 32.

  On the other hand, a hoisting rope 33 is wound around the hoisting winch 28, and the leading end side of the hoisting rope 33 is wound around a sheave 26A provided on the leading end side of the jib 26 and hangs down to the ground side. A hanging load hook 34 is attached to the tip portion. Accordingly, the hoisting hook 34 is lifted and lowered on the tip end side of the jib 26 by winding and unwinding the hoisting rope 33 by the hoisting winch 28.

  51A and 51B are mast holders located above the base mast 12 and provided between the middle part of the mast 21 and the steel tower 1 in the middle of construction or dismantling. Each of the mast holders 51A and 51B is shown in FIGS. As shown in FIG. 4, the beam comprises a basic beam 52, left and right swing arms 62, a deck 63, a mast guide 64, support rods 69, 70, and 75, a spacing frame 91, a contact plate 54, and the like. And each mast holder 51 stabilizes both by supporting the intermediate part of the mast 21 using the steel tower 1 in the middle of construction or dismantling.

  The basic beam 52 has a length longer than the width between the left and right columns 2A, 2A of the tower 1 to which the basic beam 52 is attached. The basic beam 52 is made of H-shaped steel or the like and extends in the horizontal direction, and is positioned between the horizontal beams 52A and 52B and between the horizontal beams 52A and 52B. Are formed in a rectangular frame shape by a plurality of vertical beams 52C. Bolt mounting plates 53 for mounting the spacing frame 91 are fixed to the surfaces of the horizontal beams 52A and 52B constituting the basic beam 52 on the support 2A side by welding or the like. The bolt mounting plate 53 has three or more bolts (5 in this example) corresponding to one spacing frame 91 so that the mounting position of the spacing frame 91 can be adjusted in the longitudinal direction. An insertion hole 94 is provided.

  The interval holding frames 91 are provided corresponding to the left and right columns 2A and 2A, respectively, and are interposed between the horizontal beams 52A and 52B of the basic beam 52 and the column 2A. Each interval holding frame 91 includes a main body portion 91A, a support column 2A side bolt mounting plate 91B, and a basic beam 52 side bolt mounting plate 91C.

  As shown in FIG. 8, each bolt mounting plate 91B, 91C has four bolt insertion holes 96, 97, respectively. In this embodiment, the column 2A of the steel tower 1 is inclined, so as shown in FIG. 8B, the column 2A side bolt mounting plate 91B has a base beam 52 side bolt mounting plate on its upper and lower sides. It is inclined by an angle α so that either the left or right side of 91C rises. This angle α corresponds to an angle at which the left and right support columns 2A, 2A are inclined closer to each other as viewed from the mast 21 side.

  Further, as shown in FIG. 8C, the column 2A side bolt mounting plate 91B is inclined by an angle β so that the upper side is separated from the upper side of the basic beam 52 side bolt mounting plate 91C. This angle β corresponds to an angle at which the left and right struts 2A, 2A are inclined so as to be separated from the upper part as viewed from the mast 21.

  As the gap holding frame 91, mast holders 51A and 51B having different lengths W (see FIG. 5) in the direction facing the steel tower 1 are prepared, and the lower side, that is, the mast holder having a narrow gap between the support 2A and the mast 21. A mast holder 51B having a larger length W than the interval holding frame 91 used for 51A, that is, a mast holder 51B having a wider interval between the column 2A and the mast 21 is used. Further, the mast holders 51A and 51B are of the same size and structure as the basic beam 52, support rods 69, 70, 75 described later, the swing arm 62, the deck 63, and the like.

  The abutment plate 54 is detachably fixed to the column 2A by a U bolt 60 and a nut 93 together with the column 2A side bolt mounting plate 91B of the interval holding frame 91. The contact plate 54 has a contact surface that matches the outer peripheral surface of the support 2A. In this example, the contact surface is formed in an arc shape that matches the arc surface that is the cross-sectional shape of the support 2A. Reference numeral 54A denotes a bolt mounting plate that matches the bolt mounting plate 91B of the spacing frame 91, and the bolt mounting plate 54A has a bolt insertion hole 98. The contact plate 54 and the interval holding frame 91 are inserted into the bolt insertion holes 98 and 96 provided in the bolt mounting plates 54A and 91B through the U bolts 60 that hold the support 2A, and are screwed into the nuts 93 and fastened. , It is detachably fixed to the column 2A.

  The spacing frame 91 and the horizontal beams 52A and 52B of the basic beam 52 are bolted to the bolt insertion hole 97 provided in the bolt mounting plate 91C on the basic beam 52 side of the spacing frame 91 and the bolt insertion hole 94 of the bolt mounting plate 53. It is detachably connected by inserting 92 and screwing and fastening to the nut 61.

  A pair of upper arm stays 55 and 55 that support the swing arm 62 are fixed to the surface of the upper horizontal beam 52A facing the mast 21 so as to be spaced apart from each other in the length direction. The deck stays 56, 56 that support the deck 63 are fixed to each other. On the other hand, on the surface of the lower horizontal beam 52B that faces the mast 21, a pair of lower arm stays 57 (only one shown) that supports the swing arm 62 together with each upper arm stay 55 are separated in the length direction. And is fixed.

  Further, a bracket 58 for mounting the support rod 69 and a bracket 59 for mounting the support rods 70 and 75 are spaced apart in the length direction on the surface of the upper horizontal beam 52A facing the mast 21. It is fixed.

  The swing arms 62 and 62 are attached to the basic beam 52 so as to be swingable in the horizontal direction. Each swing arm 62 includes a vertical beam 62A extending upward and downward, and a horizontal direction from the upper end side of the vertical beam 62A. Are formed in a triangular frame shape by a horizontal beam 62B extending in a slanting direction and an inclined beam 62C extending obliquely between the lower end side of the vertical beam 62A and the front end side of the horizontal beam 62B.

  Here, the vertical beam 62A which is the base end side of the swing arm 62 is pin-coupled to the upper and lower arm stays 55 and 57 provided on the basic beam 52 so as to be swingable in the horizontal direction. Each swing arm 62 has an assembly position in which the front end side of the horizontal beam 62B extends toward the middle portion of the mast 21 as shown in FIGS. 4 to 6, and the front end side of the horizontal beam 62B as shown in FIG. The mast guide 64 (described later) is coupled to the distal end side of the lateral beam 62B in a state where the swing arm 62 is swung between the folded position and the swing arm 62 is positioned at the assembly position.

  The deck 63 is positioned between the swing arms 62 and is attached to the horizontal beam 52A of the basic beam 52. The deck 63 is formed of a square frame body provided with a mesh on the inner side, and the base end side is the basic beam. Each deck stay 56 of 52 is pin-coupled so as to be rotatable upward and downward. The deck 63 is folded between the horizontal beam 62B of each swing arm 62 and horizontally extending as shown in FIGS. 4 to 6 and the basic beam 52 side as shown in FIG. It is rotated between the transfer position and positioned at the assembly position, thereby forming a scaffold for the operator.

  Reference numeral 64 denotes a mast guide attached to an intermediate portion of the mast 21. The mast guide 64 is formed in a substantially square frame shape surrounding the mast 21 from the outside. Four guide rollers 65 that are always in contact with the outer corners of the mast 21 are rotatably provided at the inner corners of the mast guide 64, and each of these guide rollers 65 has the mast guide 64 mounted on the mast 21. The mast guide 64 is prohibited from moving in the horizontal direction with respect to the mast 21.

  Here, the mast guide 64 uses a stopper or the like (not shown) on the upper end side of the mast 21 in the previous stage of supporting the middle portion of the mast 21 using the mast holder 51 on the steel tower 1 during construction or dismantling. It is temporarily fixed. The mast guide 64 is separated from the mast 21 to the assembly position when the mast 21 is supported by the steel tower 1 using the mast holders 51A and 51B, and the tip of each swing arm 62 (lateral beam 62B). It is arranged on the side.

  Further, on the lower surface side of the mast guide 64, four positioning pins 66 are provided so as to engage with the horizontal beam 62B of the swing arm 62 at the assembly position, and these positioning pins 66 are connected to the horizontal beam of each swing arm 62. By engaging with 62B, the mast guide 64 can be positioned on the distal end side of the swing arm 62. Further, a bracket 67 for connecting the support rods 69 and 75 and a bracket 68 for connecting the support rod 70 are fixed to the outer corners of the mast guide 64.

  The support rods 69 and 70 are provided between the basic beam 52 and the mast guide 64, and the support rod 69 becomes screw shafts 69A and 69B that can expand and contract on both sides in the length direction, and the screw shaft on the base end side. 69A is pin-coupled to the bracket 58 of the basic beam 52 using the pin 71, and the screw shaft 69B on the distal end side is detachably pin-coupled to the bracket 67 of the mast guide 64 using the pin 72.

  On the other hand, the support rod 70 has screw shafts 70A and 70B that can expand and contract on both sides in the length direction, and the screw shaft 70A on the proximal end side is pin-coupled to the bracket 59 of the basic beam 52 using the pin 73, and the distal end side. The screw shaft 70 </ b> B is detachably pin-coupled to the bracket 68 of the mast guide 64 using a pin 74.

  Reference numeral 75 denotes another support rod positioned between the support rods 69 and 70 and provided obliquely between the basic beam 52 and the mast guide 64. The support rod 75 is extendable on both sides in the length direction. The screw shafts 75A and 75B become the base, and the screw shaft 75A on the proximal end side is pin-coupled to the bracket 59 of the basic beam 52 using the pin 76, and the screw shaft 75B on the distal end side is the bracket of the mast guide 64 using the pin 72. 67 is detachably pin-coupled.

  Thereby, each support rod 69,70,75 connects between the tower 1 under construction and the middle part of the mast 21 via the basic beam 52 and the mast guide 64, and uses the tower 1 under construction. The mast 21 is supported. In this case, the support rod 75 functions to support the mast 21 in cooperation with the support rods 69 and 70 and to receive a rotational force acting on the mast 21 by the turning operation of the working device 23 or the like.

  Here, the screw shaft 69A of the support rod 69 is always attached to the bracket 58 by the pin 71, the screw shaft 70A of the support rod 70 is always attached to the bracket 59 by the pin 73, and the screw shaft 75A of the support rod 75 is fixed by the pin 76. It is always attached to the bracket 59. As a result, as shown in FIG. 7, with the basic beam 52, the swing arms 62, the deck 63, and the support rods 69, 70, and 75 being integrated, they are efficiently directed once toward the tower 1 under construction. It is the structure which can be conveyed to.

  The steel tower crane 11 according to this embodiment has the above-described configuration. Hereinafter, a steel tower construction method using the steel tower crane 11 will be described.

  First, the gantry 3 serving as the foundation of the steel tower 1 and the base frame 13 serving as the foundation of the crane 11 are laid on the ground adjacent to each other. Then, for example, a two-stage steel tower structure 2 is continuously connected on the gantry 3 using a small hydraulic crane (not shown) that can be carried into a narrow area such as an urban area, a roadside zone of a road, or a mountainous area. Then, the foundation of the steel tower 1 is assembled, and the base mast 12 is installed on the base frame 13 located on the side of the steel tower 1 (base mast installation process). Thereafter, if necessary, the steel tower 1 under construction and the upper end side of the base mast 12 are connected using a wire or rod or basic beam 52 and support rods 60, 70, 75.

  Next, for example, a mast 21 having three-stage joint masts 22 is assembled, and a set number of mast holders 51A and 51B to be attached to the mast 21 using a stopper or the like (not shown) on the upper end side of the mast 21 ( After the number of mast guides 64 corresponding to two sets in this embodiment is attached, the lower end side of the mast 21 is assembled inside the base mast 12 using a hydraulic crane (mast assembling step).

  And the working device 23 is attached to the upper end side of the mast 21 supported by the base mast 12 using a hydraulic crane (not shown) (working device attachment process). Thereby, the posture which assembles the steel tower 1 using the working device 23 instead of a hydraulic crane with a small lift is prepared.

  Next, the work device 23 is operated using a remote operation device (not shown), the steel tower structure 2 is lifted using the work apparatus 23, and this steel tower structure 2 is connected to the existing steel tower 1. As a result, the steel tower 1 is gradually assembled (steel tower assembly process).

  In this way, when the ground height of the steel tower 1 is increased by sequentially connecting the steel tower structure 2 on the steel tower 1, the mast 21 is extended in the height direction according to the ground height of the steel tower 1. Therefore, the joint mast 22 is connected to the lower end side of the base mast 12 (joint mast connection process).

  Here, in the joint mast connecting step, as shown in FIGS. 2 and 3, the tip end side of the wire rope 18 wound around the rope winch 17 is connected to the lower end portion of the mast 21, and the wire rope 18 is connected by the rope winch 17. , The lower end side of the mast 21 is lifted from the base frame 13, and a space for inserting the next joint mast 22 to be connected is secured in the base mast 12.

  Then, the joint mast 22 is placed on the joint mast insertion device 20, and the joint mast insertion device 20 is rotated toward the base mast 12 to insert the joint mast 22 into the base mast 12. The joint mast 22 is connected to the lower end side of the mast 21.

  In this way, the rope winch 17 and the joint mast insertion device 20 provided on the base mast 12 can be used to safely connect the joint mast 22 by ground work, and the mast according to the ground height of the tower 1. 21 can be extended in the height direction.

  Then, in the middle of constructing the tower 1 using the work device 23 while extending the mast 21, a first stage mast holder 51A is attached between the middle part of the tower 1 and the middle part of the mast 21, and the mast holder 51A The two are connected (mast holder attaching process).

  Here, in the mast holder attaching step, the interval holding frames 91 are attached in advance on both sides of the basic beam 52 of the mast holder 51A. Since the swing beam 62, the deck 63, and the support rods 69, 70, and 75 are integrally attached to the basic beam 52 in advance, the basic beam 52, the swing arm 62, the deck 63, and the support rods 69 and 70 are integrated. 75, the interval holding frame 91 can be lifted at once using the work device 23 and efficiently conveyed to the vicinity of the tower 1.

  Then, for example, an operator climbing the steel tower 1 fixes the basic beam 52 to the steel tower 1 (the column 2 </ b> A of the steel tower structure 2) together with the interval holding frame 91 and the contact plate 54 using the U bolt 60 and the nut 93. As described above, when the gap holding frame 91 is interposed between the basic beam 52 and the support column 2A, a protrusion 95 such as a ladder is present on the surface facing the mast 21 of the tower 1 (see FIG. 5). However, the basic beam 52 can be attached without the projection 95 and the basic beam 52 interfering with each other.

  Thereafter, each swing arm 62 is swung from the transfer position (position of FIG. 7) to the assembly position (positions of FIGS. 4 to 6), and the deck 63 is rotated from the transfer position to the assembly position. By engaging 63 with the transverse beam 62B of each swing arm 62, both are fixed to the working position.

  Next, the operator lowers the lower mast guide 64 of the mast guide 64 attached to the upper end side of the mast 21 along the mast 21, using the deck 63 as a scaffold, for example, and moves the mast guide 64 down. The swing arm 62 (lateral beam 62B) at the assembly position is disposed on the tip side.

  Then, the operator pin-couples the screw shaft 69B of the support rod 69 and the screw shaft 75B of the support rod 75 to the bracket 67 of the mast guide 64 using the pin 72, and also connects the screw shaft 70B of the support rod 70 to the pin 74. Are used to pin-couple to the bracket 68 of the mast guide 64. In this case, the connecting operation between the support rods 69 and 75 and the bracket 67 and the connecting operation between the support rod 70 and the bracket 68 can be efficiently performed only by inserting the pins 72 and 74, respectively.

  Further, when performing the operation of arranging the mast guide 64 attached to the mast 21 on the distal end side of the swing arm 62 and the operation of connecting the support rods 69, 70, 75, the operator was attached to the basic beam 52. Using the deck 63 as a scaffold, these operations can be performed safely and efficiently.

  Thus, by attaching the mast holder 51A between the steel tower 1 under construction and the middle part of the mast 21, the steel tower 1 and the mast 21 integrated by the mast holder 51A complement each other with respect to the strength against shaking. become. For this reason, the steel tower 1 can be safely assembled using the work device 23 in a state where the steel tower 1 and the mast 21 are stabilized.

  And after attaching the mast holder 51A between the middle part of the tower 1 and the middle part of the mast 21, by carrying out the above-mentioned tower assembly process and the joint mast connection process appropriately, the ground height of the tower 1 is increased. Accordingly, the tower 1 is further assembled using the work device 23 while the mast 21 is extended.

  When the mast 21 extends above the existing mast holder 51A, the second stage mast holder 51B is attached to the upper side of the first stage mast holder 51A, and the middle part of the mast 21 is moved by the upper and lower mast holders 51A and 51B. To support.

  As a result, even if the height of the mast 21 is increased, the middle portion of the mast 21 can be reliably supported by the two mast holders 51A and 51B, and the work provided on the upper end side of the mast 21 By further assembling the steel tower 1 using the device 23, the steel tower 1 can be safely constructed as shown in FIG.

  When the dismantling work of the steel tower 1 is performed, the base mast 12, the mast 21, and the work device 23 are assembled as described above, and the steel tower 1 and the mast 21 are connected by the mast holders 51A and 51B, and the work device 23 is used. To dismantle. Further, as the dismantling work of the steel tower 1 proceeds, the mast 21 is reduced and the mast holders 51A and 51B are removed.

  FIG. 9 shows another embodiment of the present invention. In this embodiment, the width of the steel tower 2 is constant and the column 2A is installed vertically. In this embodiment, the space holding frame 91 having various lengths W is prepared, and the space holding frame 91 selected from among them is used, so that the tower 1 and the mast are matched according to the situation at the site. The distance between the mast 21 and the steel tower 1 can be relaxed, and the mast can be installed in a suitable manner in the field.

  As described above, since the mast holders 51A and 51B connecting the tower 1 and the mast 21 are provided with the interval holding frames 91 interposed between the left and right support columns 2A of the tower 1 and the basic beam 52, respectively. As shown in FIG. 5, even when a protrusion 95 such as a ladder is provided between the left and right support columns 2A, the basic beam 52 can be attached while avoiding the protrusion 95. Also, by preparing various lengths W of the interval holding frame 91 in the direction facing the steel tower 1, the degree of freedom in setting the distance between the mast 21 and the steel tower 1 is increased, and the situation in the field is increased. It is possible to install the mast 21 suitable for the above.

  Further, when providing a plurality of mast holders 51A, 51B for the tower 1 having an inclined column 2A, the basic beam 52 and the support rods 69, 70, 75 have the same structure and size for each set. The gap holding frame 91 is configured to have a different length W according to the height of the mounting portion, so that the basic beam 52 and the support rods 69, 70, 75, etc. can be used in common. Costs can be reduced, and the basic beam 52, the support rods 69, 70, 75, etc. can be used for different types of steel towers 1 and economy can be achieved.

  In addition, since the basic beam 52 is provided with a number of mounting holes 94 that can change the coupling position in the length direction of the basic beam 52 by the bolt 92 of the spacing frame 91, it can be easily applied to towers having different widths. Become. Further, when the tower column 2A has an inclination, it can be easily handled by changing the attachment position of the interval holding frame 91 attached to the base beam 52 at different heights.

  Moreover, in this embodiment, since the detachable abutment plate 54 having a contact surface corresponding to the shape of the left and right support pillars 2A of the tower 1 is provided between the interval holding frame 91 and the tower 1, By using the abutment plate 54 that matches the structure of the tower pillar 2A, the interval holding frame 91 can be firmly fixed to the pillar 2A.

  Further, since the abutment plate 54 can be attached to and detached from the interval holding frame 91, by removing the abutment plate 54, as shown in FIG. 10, the support 2D has a rectangular cross section, or as shown in FIG. When the column 2E has an L-shaped cross section, the bolt mounting plate 91B is applied to the surface of the columns 2D and 2E facing the mast 21, and the contact plate 100 through which the bolt 99 is inserted is applied to the opposite surface. 99 is inserted into the bolt insertion hole 96 of the bolt mounting plate 91B, screwed into the nut 93, and fastened, whereby the spacing holding frame 91 can be firmly fixed to the columns 2D and 2E.

  FIG. 12 shows another example of the interval holding frame, and the interval holding frame 91X of this example is provided with a horizontally long bolt insertion hole 97 on the bolt mounting plate 91C on the basic beam 52 side. The bolt insertion hole 96 of the bolt mounting plate 91B on the support 2A side is a round hole as described above. Further, the bolt mounting plates 91B and 91C are welded to each other by a binding material 91D having a U-shaped cross section in order to increase the strength.

  By making the bolt insertion hole 97 through which the bolt 92 is inserted into the basic beam 52 as a long hole like the interval holding frame 91X of this example, fine adjustment in the longitudinal direction of the basic beam 52 of the interval holding frame 91X with respect to the basic beam 52 is possible. It becomes possible, and attachment of the space | interval holding frame 91X becomes easier.

  FIG. 13 shows another embodiment of the present invention. The interval holding frames 91Y and 91Z of this embodiment make the plan view of the bolt mounting plates 91B and 91C on the support 2A side non-parallel, and the length of one interval holding frame 91Y in the steel tower facing direction is the other interval holding frame 91Z. The length of the steel tower facing direction is made larger.

  Thus, for the same set, the width of the interval holding frame 91Y attached to the left column as viewed from the mast 21 and the interval holding frame 91Z attached to the right column are different from each other in the steel tower facing direction. Since the opposing surface to the tower 1 can be installed non-parallel, the degree of freedom in the relative orientation of the tower 1 and the mast 21 is increased, and the mast is installed at a suitable position and orientation on the site. Is possible.

  In the above embodiment, the case where two mast holders 51 are attached between the steel tower 1 and the mast 21 has been described as an example. However, the present invention is not limited to this, and one mast holder 51 is provided depending on the height of the mast 21. Alternatively, a configuration in which three or more mast holders 51 are attached may be employed.

It is a side view which shows one Embodiment of the crane for steel towers of this invention in the working state of a steel tower. It is a side view which shows the lower structure of the crane for steel towers of this embodiment. It is a front view which shows the lower structure of the crane for steel towers of this embodiment. It is a side view which shows the mast holder of this embodiment in an attachment state. It is a top view which shows the mast holder of this embodiment in an attachment state. It is a perspective view which shows the mast holder of this embodiment in an attachment state. It is a disassembled plan view which shows the mast holder of this embodiment. (A), (B), (C) is a plan view, a front view, and a side view, respectively, of an interval holding frame used in the mast holder of this embodiment. It is a side view which shows the other construction example of the crane for steel towers of this Embodiment. It is a top view which shows the other construction example of the crane for steel towers of this Embodiment. It is a top view which shows the other construction example of the crane for steel towers of this Embodiment. (A), (B) is the top view and front view which show the other example of the space | interval holding frame used for the mast holder of this invention, respectively. It is a top view which shows the crane for steel towers of other embodiment of this invention in an operation state.

Explanation of symbols

1: steel tower, 2: steel tower structure, 2A, 2D, 2E: support, 2B: transverse beam, 2C: inclined beam, 3: mount, 12: base mast, 13: base frame, 17: rope winch, 18: wire Rope, 19: Sheave, 20: Joint mast insertion device, 21: Mast, 22: Joint mast, 22A: Strut, 22B: Transverse beam, 22C: Inclined beam, 23: Working device, 24: Swivel device, 25: Type A Frame: 26: jib, 34: hook, 27: hoisting winch, 28: hoisting winch, 29: hoisting rope, 30: jib hanger, 31: jib bridle, 33: hoisting rope, 34: hanging hook, 51, 51A , 51B: mast holder, 52: basic beam, 52A, 52B: horizontal beam, 52C: vertical beam, 53: bolt mounting plate, 54: contact plate, 54A: bolt mounting 55: Upper arm stay, 56: Deck stay, 57: Lower arm stay, 58: Bracket, 60: U bolt, 61: Nut, 62: Swing arm, 62A: Vertical beam, 62B: Horizontal beam, 62C: Inclined beam , 63: deck, 64: mast guide, 65: guide roller, 66: positioning pin, 67, 68: bracket, 69, 70, 75 support rod, 69A, 69B, 70A, 70B, 75A, 75B: screw shaft, 71 -74,76: Pins, 91, 91X-91Z: Spacing holding frame, 91A: Main part, 91B, 91C: Bolt mounting plate, 91D: Binding material, 92: Bolt, 93: Nut, 94, 96-98: Bolt Insertion hole, 95: protrusion, 99: bolt, 100: contact plate

Claims (5)

A mast configured by sequentially connecting a number of joint masts in the height direction;
A working device for hanging work provided on the upper end side of the mast so as to be capable of turning via a turning device;
In a crane for a tower equipped with a mast holder that is detachably provided between a midway part of the mast and a steel tower in the middle of construction or dismantling, and supporting the midway part of the mast,
The mast holder is a basic beam having a length equal to or greater than the facing width on the mast side of the steel tower,
An interval holding frame that is detachably interposed between the left and right struts facing the mast in the steel tower during construction or dismantling, and the basic beam,
A crane for a steel tower comprising three or more support rods having a proximal end attached to the basic beam and a distal end detachably connected to a mast guide attached to the mast. In the tower crane of Claim 1,
A plurality of sets of the basic beam, the spacing frame and the support rod;
The basic beam and the support rod have a common structure and size for each set;
The tower crane is characterized in that the interval holding frame of each set has a tower facing direction length that is different in at least a part of the set according to the height of the attachment portion. In the tower crane of Claim 1 or 2,
The tower crane according to claim 1, wherein the basic beam has three or more bolt insertion holes that allow the coupling position in the length direction of the basic beam by the bolts of the spacing frame to be changed. In the tower crane of any one of Claim 1 to 3,
A crane for a steel tower comprising a detachable abutment plate having a contact surface corresponding to the shape of the left and right pillars of the steel tower between the interval holding frame and the steel tower. In the crane for steel towers of any one of Claim 1 to 4,
In the same set, the interval holding frame is different in length in the tower facing direction of the interval holding frame attached to the left column and the interval holding frame attached to the right column, and the opposing surfaces of the mast and the tower are different from each other. A tower crane that is installed non-parallel.

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