JP4704851B2 - Crane base isolation structure - Google Patents

Description

  The present invention supports the tower crane platform with lifting function using the building frame, attenuates the shaking generated in the building frame during earthquakes and strong winds, and the shaking is transmitted to the crane frame as it is. This is related to the seismic isolation structure of the crane foundation that prevents the earthquake.

  In a conventional climbing tower crane with a lifting function (hereinafter referred to as a crane), the gantry supporting the mast portion is supported by using the building frame, but the supporting means is supported by placing the gantry on a beam member. ing.

  According to the structure in which the crane mount is placed and fixed on the receiving beam serving as the beam member, the height to the top of the crane mount is extremely high, and it may not fit within the floor height. In addition, because of its high height, a torsional moment is generated on the receiving beam side with respect to the lateral force generated in the crane mount, and reinforcement measures have been forced.

  FIG. 5 shows a basic tower beam structure of a general tower crane disclosed in Patent Document 1 below. The protruding portion of the outrigger C extending from the left and right of the crane mount B is placed on the temporary receiving beam A supported by a bracket or the like, and the lower flange D and the outrigger C are connected between the lower support member E and the upper support member F. The outrigger C is fixed by tightening the bolt G around the bolt.

Accordingly, the height H that is required to support the crane gantry B includes, as shown in FIG. 6, the height H ₀ of the temporary receiving beam _A, the height H ₁ of the outrigger _C, the support members E, F-high The total of the height H ₂ and the height H ₃ up to the tip of the projecting portion of the bolt G or the top of the gantry was extremely high.

  FIG. 7 shows the projecting portion of the outrigger J placed on the main beam I. In order to support the weight applied to the crane mount K, the reinforcing beam L is disposed below the main beam I. is doing.

  In the above-described conventional example, the height required to support the crane mount K is extremely high, and it may exceed the floor height.

  Also, in recent high-rise RC buildings, the columns and beam members are made into PCa that is manufactured in advance in the factory in order to shorten the construction period, and those with solid walls and core walls are the size of the cross section of the beam It is small and slender. Therefore, there is no problem as a whole structure of the building, but it is impossible to support a heavy crane stand as it is on a small beam.

In such a case, a measure is adopted in which the beam itself on which the crane mount is placed is designed firmly in advance.
Japanese Patent Application No. 2004-90751 JP-A-6-156882 Patent No. 2942054 Japanese Patent Laid-Open No. 11-301973

Patent Document 1 discloses a receiving beam structure in which a bracket is temporarily installed on a pillar, and a frame is supported on the bracket or a beam fixed to the bracket.
Further, Patent Document 2 is a construction method in which a jaw is attached to a pillar and a tower crane is sequentially lifted upward like a scale insect while supporting a gantry with the jaw.
Further, Patent Document 3 discloses a support means in which a bracket is temporarily installed on a pillar, a rail of a traveling crane is laid on the bracket, and the load of the traveling crane is received by the pillar.
In Patent Document 4, a jaw is attached to a steel column embedded in a wall, and a mount is installed on the jaw. Similarly to the above, this support means also lifts the crane little by little like a scale insect.

As described above, in RC construction, beams are often constructed with weak strength, and in order to install a tower crane, the base of the tower crane is enlarged to distribute the load and to reduce the concentrated load. Ingenuity has been made. However, when the beam is extremely weak, it is difficult to install the beam due to the overload even by the above means, and the beam needs to be reinforced.
Also in the S structure, if the beam is weak in strength as described above, considerable reinforcement is required. In addition, the reinforcing portion is often removed later, which necessitates procurement of unnecessary members and useless construction.

  In order to solve the above-mentioned drawbacks, as shown in FIG. 8, the applicant provides an opening R in the web Q of the receiving beam P as a structure for supporting the crane mount M, and penetrates the outrigger N of the crane mount M into the opening R. Thus, a structure for fixing the crane mount M to the receiving beam P was proposed.

  However, although the height was successfully suppressed as a support structure for the crane mount, the shaking generated in the building frame due to earthquakes, strong winds, various vibrations, etc., was transmitted directly to the crane mount through the receiving beam of the frame and directly affected the crane. It was a structure that gave.

  On the other hand, as shown in FIG. 9, conventionally, a seismic isolation rubber U is laid in the gap between the receiving beam S and the outrigger tip T, and the outrigger is fastened and fixed by a PC steel rod V. There is a seismic isolation beam structure. Therefore, the present invention prevents the torsional moment, which is a drawback due to the above-mentioned height, from occurring, and at the same time, the PC steel bar V caused by the shaking of the building frame is not tilted, and the vibration from the building is prevented by the vibration damping means. It provides a crane base seismic isolation beam structure that can be relaxed.

  The present invention solves the above-described problem. In a crane base seismic isolation beam structure for supporting a tower crane frame, an outrigger of the crane frame is passed through an opening provided in a web of the beam, and the beam is received. It is characterized by a crane base seismic isolation beam structure in which a crane base and a crane mount are fixed via vibration damping means.

  In addition, the receiving beam is characterized by a crane base seismic isolation receiving beam structure in which a bracket is fixed to a surface of a vertical member serving as a building frame by a PC steel rod, and both ends of the bracket are supported by the bracket.

  Furthermore, the vibration damping means is characterized by a crane base seismic isolation receiving beam structure comprising a slide bearing member in contact with the outrigger and a receiving beam and a spring damper spanned between the crane mount.

  Further, the present invention is characterized by a crane base seismic isolation beam structure in which the vibration damping means is a seismic isolation rubber disposed in the gap between the cradle fixed to the beam and the outrigger.

  The present invention can lower the mounting height from the lower end of the temporary receiving beam or the main beam to the upper end of the outrigger by penetrating the opening provided in the web portion of the beam that receives the outrigger protruding from the left and right of the gantry. Therefore, the height required to support the gantry as a whole can be kept low, and therefore it is possible to prevent the occurrence of a torsional moment on the beam side caused by a lateral force from the crane gantry.

  In addition, since the mounting height can be kept low, it can be stored sufficiently in the height of the floor, and the degree of freedom of installation in the enclosure has been greatly increased.

  In addition, since the crane mount and the receiving beam are fixed via damping means, it is possible to significantly attenuate the vibration from the building frame and transmit it to the crane mount.

  In addition, because the bracket that supports the tower crane stand is attached to a vertical member such as a pillar member or a load-bearing wall as a building frame, it becomes possible to support the load of the tower crane with the vertical member, and only conventional beam support The beam reinforcement caused by In addition, a large load can be supported.

  Furthermore, the load can be supported by the frictional force between the mounting plate using the PC steel bar and the vertical member, the concentrated load is applied to the conventional bolt, and the concrete surface around the bolt is not destroyed, From this point, it was possible to support a large load.

  Moreover, in addition to the support by the frictional force, the support by the shearing force of the bolt can be used in combination, so that the load support can be dispersed.

  Furthermore, when the load is supported by the beam and the vertical member, it is possible to easily transmit the load of the tower crane from the beam to the vertical member by attaching the bracket to the vertical member directly below the beam end.

  FIG. 1: has shown the front view of the crane foundation seismic isolation beam structure which installed the crane of this invention in the building. The structure is such that the frame is received by a temporary receiving beam or a main beam (hereinafter referred to as a receiving beam including both), and the crane is fixed on the crane frame.

  The tower crane 1 supports a receiving beam fixed to a vertical member (in this embodiment, a column 2) or a receiving beam 4a on a bracket 3 as shown in FIG. In the case of a bracket, it is attached to the column 2 by a PC steel bar 5. As shown in FIGS. 2 (a) and 2 (b), the PC steel bar 5 passes through the column 2 through the hole of the mounting plate 6 of the bracket 3 and protrudes to the mounting plate 7 on the opposite side, and is fixed at the portion. It is firmly fixed by the tool 8.

In FIG. 2 (c), the bracket 3 is attached by the PC steel bar 5 as described above. However, when the bracket 3 is large, the PC steel bar 5 extends between the opposing outer walls of the column 2. The bracket 3 is fixed between the bracket 3 or the bracket 3 and the mounting plate.
In the above case, the bracket 3 can be removed without cutting the PC steel bar 5.

  2D is a plan view showing a state in which the gantry 4 is placed on the bracket 3, and FIG. 2E shows a side view thereof. The receiving beams 4a spanned between the brackets 3 are provided with an appropriate number of the same ones at appropriate intervals. The receiving beam 4a forms an opening in a part of the web, and the protruding portion of the outrigger extending from the left and right of the gantry 4 passes through the opening. By penetrating the outrigger, the axial center of the outrigger and the axial center of the receiving beam 4a can be made to coincide or substantially coincide with each other, and a twisting phenomenon can be prevented.

  The vertical member may be a core wall forming a core in addition to the pillar, or may be another load bearing wall.

  The receiving beam 4a is supported by a vertical member, but as shown in FIG. 3, the outriggers 14 are protruded from both ends of the crane mount 4 into the opening 13 of the receiving beam 4a, and the distal end portion 14a is received. It is supported by the beam 4a. A slide support member 18 is laid and fixed on the upper surface plate 17 of the cradle 16 fixed to the inside of the lower flange 15, the outrigger tip 14 a is placed on the slide support member 18, and the upper flange 19 The slide support member 22 is fixed to the bottom plate 21 of the cradle 20 fixed inside, and the wedge 23 is driven into the gap between the slide support member 22 and the outrigger tip portion 14a to fix the outrigger tip portion 14a. ing.

  Instead of the wedges, the pressing bolt can be penetrated from the lower surface plate 21 of the pedestal 20 and the upper surface of the outrigger tip 14c can be strongly pressed to fix the portion.

  Similarly, instead of the wedge, the flat jack can be inserted into the gap between the lower surface plate 21 of the receiving base 20 and the upper surface of the outrigger tip 14c, and the flat jack can be raised to fix the portion. .

  The slide bearing members 18 and 22 are fixed to the outrigger tip portion 14c, and at the same time, the opposing surface which is the other surface is formed smoothly to be a sliding surface. The best material is a Teflon plate. Similarly, a slide support member may be attached to the outrigger side, and the slide support members may be used as sliding surfaces.

  Further, a hydraulic damper 24 with a spring is bridged between the lower flange 15 and / or the upper flange 19 and the crane mount 4 to prevent the crane mount 4 and the receiving beam 4a from being separated, and at the same time due to an earthquake or the like. When the building frame is shaken, the shake is transmitted from the outrigger tip 14a to the crane mount 4 through the receiving beam 4a. As described above, the slide support members 18 and 22 are provided on the upper and lower surfaces of the outrigger tip 14a. Therefore, the outrigger tip 14a swings in the direction of the arrow shown in FIG. By the swinging, the vibration from the receiving beam 4a can attenuate the swinging to the crane mount 4 without transmitting much of the vibration to the outrigger tip 14a.

  FIG. 4 shows another embodiment of the crane foundation seismic isolation beam structure. The upper surface plate 17 ′ of the cradle 16 ′ and the lower surface of the outrigger tip 14a, and the lower surface plate 21 of the cradle 20 and the outrigger tip 14a. A seismic isolation rubber 25 is disposed in a gap with the upper surface of the base plate.

  Further, the tie bolt 26 is bridged between the upper and lower receiving bases 16 ′ and 20 along both side surfaces of the outrigger tip end portion 14 a, and the tie bolt 26 is tightened to fix the outrigger tip portion 14 a.

  With the above configuration, when the receiving beam 4a swings in the direction of the arrow shown in FIG. 4B, the seismic isolation rubber 25 is deformed, and the deformation absorbs and attenuates the vibration from the building frame, and the vibration is directly applied. The vibration to the crane mount 4 can be greatly attenuated without being transmitted to the outrigger 14.

It is a front view which shows the whole crane foundation seismic isolation receiving beam structure of this invention. It is a front view of the bracket support part of the crane foundation seismic isolation receiving beam structure of this invention. It is a side view of the bracket support part of the crane foundation seismic isolation receiving beam structure of this invention. It is a plane sectional view of other examples of a bracket support part of a crane foundation seismic isolation receiving beam structure of the present invention. It is a top view which shows the whole crane foundation seismic isolation receiving beam structure of this invention. It is a front view which shows the whole crane foundation seismic isolation receiving beam structure of this invention. It is a perspective view of the Example which shows the support structure of the outrigger of the crane foundation seismic isolation receiving beam structure of this invention. It is a sectional side view of the Example which shows the support structure of the outrigger of the crane foundation seismic isolation receiving beam structure of this invention. It is a sectional side view of the other Example which shows the support structure of the outrigger of the crane foundation receiving beam structure of this invention. It is a sectional side view of the other Example which shows the support structure of the outrigger of the crane foundation receiving beam structure of this invention. It is a perspective view of the prior art example which shows the support structure of the outrigger of the foundation receiving beam structure of a crane. It is a sectional side view of the prior art example which shows the support structure of the outrigger of the foundation receiving beam structure of a crane. It is a sectional side view of the other conventional example which shows the support structure of the outrigger of the foundation receiving beam structure of a crane. It is a perspective view of the invention which the applicant proposed previously which shows the support structure of the outrigger of the foundation receiving beam structure of a crane. It is a sectional side view of the prior art example which shows the vibration damping means of the crane base seismic isolation receiving beam structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tower crane 2 Pillar 3 Bracket 4, Stand 4a Temporary receiving beam 5 PC steel bar 6, 7 Mounting plate 8 Fixing tool 9 Insert 10 Bolt 12 Web 13 Opening part 14 Outrigger 14a Outrigger front end 15 Lower flange 16, 16 ', 20 Base 17, 17 ′ Upper surface plate 18, 22 Slide support material 19 Upper flange 21 Lower surface plate 23 Wedge 24 Spring-loaded hydraulic damper 25 Seismic isolation rubber 26 Tie bolt 43 Flat jackie

Claims (4)

  In the crane base seismic isolation beam structure that supports the tower crane stand, the outrigger of the crane stand is passed through the opening provided in the web of the stand beam, and the receiving beam and the crane stand are fixed through vibration damping means. This is a crane base seismic isolation beam structure.   2. The crane foundation seismic isolation beam according to claim 1, wherein the receiving beam is formed by fixing a bracket with a PC steel rod to a surface of a vertical member serving as a frame of a building, and supporting both ends of the bracket on the bracket. Construction.   The crane foundation seismic isolation beam structure according to claim 1 or 2, wherein the vibration damping means is a slide bearing member and a receiving beam that are in contact with the outrigger and a damper that is bridged between the crane mount.   The crane base seismic isolation receiving beam structure according to claim 1 or 2, wherein the vibration damping means is a seismic isolation rubber disposed in a gap between a cradle fixed to the receiving beam and the outrigger.

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