JP4842589B2 - Seismic structure of crane base using sliding members - Google Patents

Description

  The present invention supports the base of a tower crane with an elevating function using the building frame, attenuates the shaking generated in the building frame during an earthquake or strong wind, and transmits the shaking as it is to the crane base. The present invention relates to a seismic structure of a crane base using a sliding member to prevent.

  In a conventional climbing tower crane with an elevating function (hereinafter referred to as a crane), the base that supports the mast portion is supported by using a building frame. I support it.

According to the structure in which the crane base is mounted and fixed on the receiving beam, the crane base is supported in the vertical direction by being fastened with a frame and an anchor bolt, etc., and is horizontally supported by the frictional force between the crane base and the frame and the anchor bolt. The movement of the direction was prevented. Due to the above structure, the horizontal force generated in the frame due to earthquakes, strong winds, etc. was transmitted directly to the crane base.
JP 2004-059321 A JP 2002-226171 A

  When the crane base is fixed to the chassis with anchor bolts or the like, all of the vibration of the chassis caused by an earthquake or strong wind is transmitted to the crane base. In addition, a larger horizontal force than that calculated due to a resonance phenomenon with the natural frequency of the housing has occurred.

  The present invention prevents the vibration from the above-mentioned frame from being transmitted to the crane base, and a friction coefficient is provided at a position where the receiving beam supporting the tower crane base and the main beam of the frame supporting the receiving beam are in contact with each other. A crane-base seismic structure using a sliding member in which a low-profile member is disposed and the receiving beam and the main beam are slidable.

  Further, the present invention is characterized by a crane-base earthquake-resistant structure using a sliding member in which a temporary restraining beam is installed on the receiving beam.

  Further, a crane-base seismic structure using a sliding member in which a member having a low friction coefficient is disposed at a position where the receiving beam and the holding beam are in contact with each other, and the receiving beam and the holding beam are slidable. .

  Further, the present invention is characterized by a crane-base earthquake-resistant structure using a sliding member in which the receiving beam and the main beam are connected by a damper and the damper serves as a vibration damping means.

  Furthermore, the restraining beam is characterized by a crane-base earthquake-resistant structure using a sliding member in which both ends are installed and fixed to a bracket fixed to a main pillar with a PC steel rod.

  In the present invention, since the receiving beam can be moved in the horizontal direction, vibrations caused by earthquakes, strong winds, etc. on the frame are attenuated by the beam, and vibration transmission to the crane base on the receiving beam is greatly reduced. This makes it possible to reduce the safety of the crane.

  In addition, by connecting the main beam and the receiving beam with a damper, the vibration can be attenuated and restored to the original position.

  Furthermore, by installing a restraining beam on the receiving beam, it was possible to resist the pulling force generated on the receiving beam.

  An object of the present invention is to attenuate and transmit vibrations from a frame generated by the above-described earthquake or strong wind to a crane base, and will be described below based on examples.

FIG. 1 is a front view showing an embodiment of a crane base earthquake-resistant structure of the present invention, and FIG. 2 is a plan view thereof.
A main frame 1 is formed by a main column 1 as a vertical member of the building and a main beam 2 fixed in the horizontal direction between the main columns 1. On the main beam 2, at least two receiving beams 3 are installed across adjacent main beams 2. In the figure, I-shaped steel is used.

  The lower flange 4 side of the receiving beam 3 is placed on the main beam 2, and the upper flange 5 side is prevented from tilting due to a fall or the like by a restraining beam 6. 1 and 2 are arranged in parallel to the main beam 2 and both ends thereof are fixed to the main column 1.

The holding beam 6 can be attached to the main pillar 1 by using a bracket 7 and a PC steel bar 8, for example, as shown in FIG. A bracket 7 fixed to the設柱1 is supported該抑example beam 6. The bracket 7 is attached to the main column 1 by a PC steel bar 8. As shown in the figure, the PC steel bar 8 penetrates the main pillar 1 through the hole of the mounting plate of the bracket 7 and protrudes to the mounting plate on the opposite side, and is firmly fixed by the fixture 9 at the portion.

In FIG. 3B, the bracket 7 is attached by the PC steel bar 8 as described above. However, when the bracket 7 is large, the PC steel bar 8 straddles between the opposing outer walls of the main column 1. In this way, it is fixed between the bracket 7 or between the bracket 7 and the mounting plate.
In the above case, the bracket 7 can be removed without cutting the PC steel bar 8.

  Sliding members 10 and 11 are disposed between the main beam 2 and the receiving beam 3 and between the receiving beam 3 and the holding beam 6, respectively. The sliding members 10 and 11 are made of a material having a low coefficient of friction such as Teflon (registered trademark). 1 and 2, sliding members 10 and 11 are provided between the lower flange 4 of the main beam 2 and the receiving beam 3 and between the upper flange 5 and the holding beam 6. Although the said receiving beam 3 is made into I-type steel in the figure, it is not limited to it, and is not limited to a steel frame.

  A base portion (not shown) serving as a base of the crane is fixed on the receiving beam 3, and a tower portion is extended upward.

  As shown in FIG. 2, dampers 12 are disposed between the main beam 2 and the receiving beam 3. One end of the damper 12 is fixed to the main beam 2 and the other end is fixed to the beam 3.

  With the above configuration, when the shaft group is shaken due to an earthquake, strong wind, or the like, the receiving beam 3 to which the crane base is fixed does not follow the swing of the main beam 2 as the shaft set by the sliding members 10 and 11. The movement of the beam 2 can be greatly reduced and moved. Thereby, the horizontal force generated by the vibration can be reduced.

  The receiving beam 3 moved in the horizontal direction is pulled back by the damper 12 connecting the main beam 2 and the receiving beam 3 to be restored.

  FIG. 4 shows the movable range W when the receiving beam 3 moves. When the main beam 2 vibrates in the short direction (arrow direction in the figure), the receiving beam 3 moves in the longitudinal direction. As a result, a horizontal force acts on the main beam 2 in the fall direction, and the expansion plate 13 is provided in the movable range W in order to secure the movement range. The extension plate 13 is flush with the upper flange of the main beam 2 so that the sliding member 10 can extend along the longitudinal direction of the lower flange of the receiving beam 3 on the left and right sides of the web of the main beam 2. For example, a T-shaped one having a surface is provided.

  FIG. 5 is a front view showing another embodiment of the crane base earthquake-resistant structure of the present invention. When it is difficult to lay down the restraining beam straddling between the main pillars 1 as in the first embodiment, the base member 15 is attached on the main beam 14, and the receiving beam 16 on the base member 15 is attached. A holding metal fitting 18 is installed on the upper flange 17, an anchor bolt 19 is bridged so as to surround the receiving beam 16 between the base member 15 and the holding metal fitting 18, and the anchor bolt 19 is tightened so that the pulling force can be resisted. Yes. Sliding members 21 and 22 are disposed between the lower flange 20 and the base member 15 and between the upper flange 17 and the holding metal member 18 to attenuate the vibration generated in the housing due to an earthquake or a strong wind. This enables the receiving beam 16 to move in the horizontal direction.

The front view which shows one Example of the earthquake-resistant structure of the crane base of this invention. The top view which shows one Example of the earthquake-resistant structure of the crane base of this invention. The partial cross section front view which shows one Example of the structure which attaches the restraining beam to this installation pillar. The top view which shows the other Example of the structure which attaches the restraining beam to a main pillar. The front view which shows the relationship between a main beam and a receiving beam. The front view which shows the other Example of the earthquake-resistant structure of the crane base of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main pillar 2, 14 Main beam 3, 16 Receiving beam 4, 20 Lower flange 5, 17 Upper flange 6 Retaining beam 7 Bracket 8 PC steel bar 9 Fixing tool 10, 11, 21, 22 Sliding member 12 Damper 13 Expansion plate 15 Base member 18 Holding bracket 19 Anchor bolt

Claims (4)

At least two receiving beams that support the base of the tower crane are bridged between the main beams of the frame frame formed by the main columns and the main beams, and the receiving beams and the books that support the receiving beams A member having a low coefficient of friction is disposed at each of a portion in contact with the installed beam and a portion in contact with the receiving beam and a temporary restraining beam that resists a pulling force generated on the receiving beam installed on the receiving beam. A crane-base seismic structure using a sliding member, wherein the main beam and the receiving beam and the holding beam are slidable.   2. The crane-base seismic structure using a sliding member according to claim 1, wherein the receiving beam and the main beam are connected by a damper, and the damper serves as vibration damping means.   The crane-base seismic structure using a sliding member according to claim 1 or 2, wherein the restraining beam is constructed between the permanent pillars and fixed to the permanent pillars.   4. The crane-base earthquake-resistant structure using a sliding member according to claim 3, wherein the restraining beams are formed by fixing both ends of the restraining beam to a bracket fixed to the main pillar with a PC steel rod.

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