JP4090463B2 - Steel tower assembly method and scaffold for assembly - Google Patents

Description

  The present invention is a tower-like structure of a size that is mainly used for mobile phone antennas among steel towers of various structures, and in particular, a steel tower assembly method for assembling by connecting and connecting single-pipe iron pillar members upward, and The present invention relates to an assembly scaffold used in this assembly method.

  In a steel tower constructed by adding steel pipes with appropriate diameters upward, a single-pipe steel tower member 1 provided with connecting flange portions 11 at the upper and lower ends is first fixed upright on a predetermined base (concrete base). Thereafter, the next iron pillar member is lifted, the flange portions 11 of the upper and lower members are faced to each other, and the connection bolt nut 2 is connected. Then, the same connection is sequentially repeated to continue to a predetermined height to construct a steel tower having a desired height.

  When constructing the steel tower, a ladder 12 is pre-packaged on the steel tower member 1, and the scaffolding rod mounting portions 13 are provided on the outer peripheral surface of the member at appropriate intervals in the outer peripheral direction and the vertical direction. This scaffold rivet mounting portion 13 is formed by welding a U-shaped steel plate having an open top and bottom and drilling a bolt hole on the outer surface. A scaffold ridge A having a screw engraved at the tip at a required position. Is inserted into the bolt hole, and the scaffolding rod A is fixed with tightening bolts screwed onto the screw on the front and back of the outer surface.

  Then, as shown in FIG. 8, the worker B uses the ladder 12 to climb up the steel tower 1a that is being built up, sits on the scaffolding rod A, and places the lifeline on the scaffolding rod mounting portion 13 as shown in FIG. The flange 11b of the steel tower member 1b, which is connected to C, is lifted by a crane, and is carried above the steel tower 1a in the middle of construction, faces the flange 11a of the steel tower 1a. 1a and 1b are connected and fixed. This operation is repeated in sequence, and when a predetermined height is reached, an antenna or other predetermined member for construction is mounted on the top of the steel tower.

  In addition, as a working scaffold for a single-pipe tower structure, Japanese Patent Laid-Open No. 2000-170376 (Patent Document 1) discloses a band in surface contact with the outer peripheral surface of the cylindrical structure in the height direction of the cylindrical structure. A temporary scaffold is disclosed in which a plurality of work scaffolds are arranged at predetermined intervals and a work scaffold is detachably attached to the band.

  Japanese Patent Laid-Open No. 2002-242421 (Patent Document 2) discloses that a lifting cage (scaffold for column tower dismantling) is raised to the top of the column tower while adding rail units, and the column tower is cut at the work stage of the lifting cage. A working scaffold for dismantling the column tower is disclosed, in which the cut pieces are taken in and the rail unit is separated and taken in by a lifting cage along with the disassembly from the top side of the column tower.

JP 2000-170376 A. JP 2002-242421A.

  As described above, it is necessary for an operator to build a steel tower by placing a foot on a scaffolding fence, and it is necessary to be a skilled craftsman who has been trained sufficiently as an operator. There is a risk of being restricted.

  Further, the working scaffold described in Patent Document 1 uses a band that is in surface contact with the outer peripheral surface of the cylindrical structure as a support base point, and can only be realized if it is a tower-like structure such as a tapered chimney. It cannot be adopted for construction of a steel tower using steel tower members that use tubular bodies of the same diameter.

  Furthermore, since the working scaffold described in Patent Document 2 is a scaffold for dismantling work, no problem occurs even if any processing is performed on the tower structure itself, so that rail mounting is possible. When building a tower-like structure, it is inconvenient to install and remove rails. Moreover, the use of the raising / lowering basket requires a power source for raising / lowering, and is an excessive quality for the construction of a steel tower in which a conventional manual work has been adopted.

  Therefore, the present invention proposes a work scaffold that can be easily assembled and easily removed, and a steel tower assembly method using the scaffold.

  The steel tower assembling method and the steel tower assembly scaffold according to the present invention have a steel pipe main body with a predetermined outer diameter as upper and lower ends as flange parts, and a steel tower ascending / descending ladder is mounted on the outer peripheral surface, and the upper and lower sides are opened at appropriate locations on the outer peripheral surface. An assembly method for constructing a steel tower by connecting a steel tower member provided with a scaffolding rod mounting portion formed by welding steel plates having a U-shaped cross-section, and sequentially connecting the upper and lower flange parts with bolts and nuts. It is a work scaffold used for the steel tower construction work.

  And the tower assembly scaffolding is provided with a plurality of vertical rod parts covering the scaffolding rod mounting portion and provided with insertion pins that can be inserted from above into the scaffolding rod mounting portion on the back, and projecting radially from the respective vertical rod portions. It is characterized by comprising a plurality of recumbent ridges, a scaffolding plate stretched over the recumbent ridge, and a handrail portion provided on the outer periphery of the scaffolding plate.

  In addition, the steel tower assembly method is to insert the insertion pin of the vertical saddle part in the above scaffold for assembly into the appropriate part of the steel tower member, and attach the scaffold to the entire circumference excluding the ladder part in the steel tower member. At the same time, the vertical shaft part is fixed to the steel pipe body with an appropriate band and fixed, and then the tower member to be added upward is similarly mounted on the ground, then lifted with a crane, and the lower tower member The connecting and fixing work of the upwardly-added steel tower members already mounted on the scaffold is sequentially performed using the scaffold mounted on the base plate.

  In the steel tower assembly method, in particular, the scaffold attached to the lower steel tower member that has completed the connecting work of the steel tower members is removed, and the next upper joint is attached as a scaffold to the steel tower member.

  Since the present invention is to construct a steel tower by the above procedure using a steel tower assembly scaffold having the above-described structure, the work scaffold can be operated on the ground by attaching the scaffold to the steel tower member in advance on the ground. In addition, since the scaffold is incorporated in the conventional state without any special processing on the steel tower member, the scaffold mounting operation can be easily performed. At the same time, since a scaffold capable of safely constructing a steel tower has been provided, the steel tower construction work can be safely and promptly performed even if it is not a skilled worker.

  Further, in response to the progress of the addition of the steel tower member, the scaffold member can be used more effectively by reusing the work scaffold at the connection fixing end point.

  Next, an embodiment of the present invention will be described. The steel tower which is the object of the present invention is that the steel tower member 1 is provided with flange portions 11 at the upper and lower ends of a steel pipe body having a predetermined outer diameter, and the flange portions 11a and 11b of the upper and lower steel tower members 1a and 1b are faced to each other. The steel tower of the desired height is constructed by repeating the connection at 2 and adding upward.

  In addition to the flange portion 11, the steel tower member 1 is provided with a tower raising / lowering ladder 12 on the outer peripheral surface (by welding) and a scaffolding hook mounting portion 13 on the outer peripheral surface. This scaffolding heel mounting portion 13 is formed by welding a U-shaped steel plate having an open top and bottom and drilling bolt holes on the outer surface, and on the outer peripheral surface of the steel pipe main body at appropriate intervals in the outer peripheral direction and the vertical direction. It is provided. For example, in the outer peripheral direction, it is provided at seven locations excluding the ladder 12 portion at intervals of 45 degrees.

  The steel tower member 1 is formed of a steel pipe main body having the same diameter, and a steel pipe main body having a smaller diameter than that of the lower portion is used as a member that is an upper portion of the steel tower.

  The work scaffold 3 includes a vertical saddle portion 31, a recumbent portion 32, a scaffold plate 33, and a handrail portion 34.

  The vertical rod portions 31 are arranged at intervals of 45 degrees corresponding to the outer peripheral surface of the steel tower member 1, and are formed in a box shape covering the scaffold rod mounting portion 13, and the scaffolding in the back portion. An insertion pin 311 that can be inserted from above is provided in the bag mounting portion 13. Note that the insertion pins 311 may be provided at two locations on the top and bottom.

  The recumbent part 32 protrudes radially from the middle part of each vertical reed part 31, and a scaffold plate 33 is installed and fixed on the recumbent part 32.

  Further, a handrail portion 34 connected and fixed to the scaffold plate 33 or the recumbent portion 32 is provided at the outer peripheral edge position of the scaffold plate 33, and a safety net 35 is attached to the handrail portion 34 as necessary.

  Thus, the scaffold 3 is used to construct a steel tower by adding the steel tower member 1 upward. The steel tower member 1 is slanted by lifting the upper side of the member with a crane, and is arranged side by side at an appropriate position above the steel tower member 1. The scaffold rod mounting portion 13 is covered with each vertical rod portion 31 in the assembly scaffold 3 and further moved to the lower side of the steel tower member 1, and the insertion pin 311 is inserted inside the scaffold rod mounting portion 13. Is placed on the scaffold heel mounting portion 13.

  In addition, the scaffold 3 is attached to the entire circumference of the tower member 1 except for the ladder 12 portion by using two members, and the upper portion of the vertical saddle portion 31 is attached to the steel pipe body with an appropriate band 4. Fix tightly.

  Then, the first steel tower member 1a is fixed upright on a predetermined base (concrete base), and the worker B climbs up using the ladder 12 and is positioned on the scaffold 3 to add and connect the next steel tower member 1b. .

  The next tower member 1b is mounted and fixed in advance on the ground in the same manner as the previous tower member 1a, and then lifted by a crane, carried above the previous tower member 1a, and the flange 11b of the tower member 1b is connected to the tower member. Faced with the flange portion 11a of 1a, an operator B located on the scaffold 3 connects and fixes the steel towers 1a and 1b with bolts and nuts 2 by manual work.

  When the connection and fixing work for the steel tower members 1a and 1b is completed, the worker B climbs to the next upper scaffold 3 and performs the connection and fixing work for the steel tower member 1 to which the next scaffold 3 is attached.

  The scaffold 3 that has been connected and fixed is connected to the crane, and when the operator B goes up to the upper scaffold, the band 4 is released from the binding, and when it is lifted upward by the crane, the insertion pin 311 is attached. Is removed from the scaffolding saddle mounting portion 13 and returned to the ground with a crane, and then used for the steel tower member 1 to be added.

  When the connection of the uppermost steel tower member 1 is completed, the scaffolding attached to the uppermost steel tower member 1 is used to attach a member corresponding to the construction purpose of the steel tower, such as standing up of an antenna or the like. When all the operations are completed, the worker B uses the ladder 12 to get down to the ground, and the scaffold 3 is returned to the ground with a crane.

  Therefore, the steel tower construction work for adding and connecting and fixing the steel tower member 1 which is a high place work is performed using a wide scaffold, so that the work efficiency is improved and the work becomes safe.

The side view of the scaffold of embodiment of this invention. The partial top view of the same scaffold. Explanatory drawing of the mounting state to the steel tower member of the scaffold. Explanatory drawing of the assembly method (scaffolding work on steel tower members: intermediate state). Explanatory drawing of the assembly method (scaffolding work on steel tower members: finished state). Explanatory drawing of the assembly method (lifting work of steel tower members). Explanatory drawing of the assembly method (addition work of steel tower members). Explanatory drawing of the conventional steel tower assembly method (addition connection work of steel tower members).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel tower member 11 Flange part 12 Steel tower raising / lowering ladder 13 Scaffolding saddle mounting part 2 Bolt nut 3 Working scaffold 31 Vertical anchoring part 311 Insertion pin 32 Horizontal anchoring part 33 Scaffolding board 34 Handrail part 35 Safety net 4 Band

Claims (3)

  Scaffolding cage formed by welding steel towers with upper and lower ends of the steel pipe body with a predetermined outer diameter and mounting towers on the outer peripheral surface and welding U-shaped steel plates with open top and bottom at appropriate locations on the outer peripheral surface A working scaffold used in a steel tower construction work for constructing a steel tower by connecting a steel tower member provided with a mounting part sequentially upward and connecting and connecting flange parts with bolts and nuts with bolts and nuts. A plurality of vertical saddle portions provided with insertion pins that can be inserted from above into a scaffolding saddle mounting portion on the back, a plurality of horizontal flange portions projecting radially from the vertical saddle portions, and A scaffold for assembling a steel tower, comprising a scaffolding board stretched around and a handrail provided on the outer periphery of the scaffolding board.   Scaffolding cage formed by welding the steel plate body with a predetermined outer diameter to the flange part, attaching a tower raising and lowering ladder to the outer peripheral surface, and welding a steel plate with a U-shaped cross section with the upper and lower parts open to the outer peripheral surface at appropriate places In the steel tower assembly method of constructing a steel tower by connecting and connecting the steel tower member provided with the mounting part sequentially with the bolts and nuts to the upper and lower abutting flange parts, the scaffold member mounting part at an appropriate position of the steel tower member, The insertion pin of the vertical saddle portion in the scaffold according to claim 1 is inserted, and the scaffold is attached to the entire circumference excluding the ladder portion in the steel tower member, and the entire vertical saddle portion is closely fixed to the steel pipe body with an appropriate band. The tower member to be added up next is similarly attached to the tower member on the ground, then lifted with a crane, and using the scaffold attached to the lower tower member, Communicating Tower assembly method, characterized in that sequentially perform fixing operation.   The tower assembly method according to claim 2, wherein the scaffold attached to the lower steel tower member for which the connection work of the steel tower members has been removed is removed, and the next upper extension steel tower member is attached as a scaffold.

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