JP5192251B2 - Tower crane support structure and construction method thereof - Google Patents

Description

  The present invention relates to a support structure for supporting a tower crane base with a building frame and a method for constructing the support structure.

  When installing a tower crane inside a building during construction work, the tower crane base is usually installed on a girder that is part of the frame. However, in a reinforced concrete building with a seismic wall and a core wall, the cross section of the beam is generally kept small, making it impossible to support the tower crane base as it is.

  Therefore, as shown in FIG. 1 of Patent Document 1, two layers of temporary reinforcing columns are installed below the beam where the base is installed, or as shown in FIG. 5 of Patent Document 1, It was necessary to disperse the load applied to the beam by installing a reinforced concrete temporary reinforcement wall by in-situ casting of concrete at the lower part of the beam.

  None of these conventional techniques require reinforcement of the frame, such as increasing the beam cross section, but it is not only expensive for temporary reinforcement, but also has the following problems when floor climbing a tower crane: . In other words, in the reinforcement method in which two layers of temporary reinforcement struts are installed at the bottom of the beam, the reinforcement struts must be installed on the climbing floor in advance when climbing the floor. Two sets of struts are required, which increases the cost, and replacement of the reinforcing struts (pre-installation) is a work using a tower crane, which increases the operation and labor of the crane. Further, in the reinforcing method in which a temporary reinforcing wall is provided in the lower part of the beam by in-situ casting of concrete, a great deal of time and cost is spent on the construction and dismantling of the temporary reinforcing wall.

  Patent Document 2 discloses a tower crane support structure in which a tower crane base is supported by a vertical member (for example, a pillar or a wall) serving as a building frame. However, in this prior art, when the base of the tower crane is supported on a concrete wall which is a building frame, as shown in FIG. 4 of Patent Document 2, a bracket is attached to the surface of the concrete wall with a number of PC steel bars. Since one end portion of the tower crane base is installed on the bracket, there are the following problems.

  That is, it is necessary to form a number of through holes for inserting a PC steel rod in the concrete wall in advance, and the PC steel rod is tensioned by a hydraulic jack (pre-stress introduction operation) that is performed when the bracket is attached. Many complicated on-site operations were required, such as removing the bracket by releasing the tension of the rod, and closing the through hole for inserting the PC steel rod after removing the bracket and the PC steel rod. Further, since the bracket projecting from the concrete wall surface in a cantilever manner receives a load from the tower crane base, bending stress acts on the concrete wall, which is not preferable in terms of structure.

JP 2006-62819 A JP 2005-272116 A

The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a tower crane support structure in which the tower crane base is supported by the building frame at an easy and low cost. It is to be able to construct.

  The technical means taken by the present invention to achieve the above object are as follows. That is, the invention according to claim 1 is a support structure for supporting the base of the tower crane, and a plurality of anchor bolts on the concrete walls facing each other among the concrete walls that form the frame of the building. Both ends of the receiving beams, which are embedded in the state protruding from the upper end surfaces of the concrete walls, and are placed on the upper end surfaces of these concrete walls are fixed to the concrete walls by the anchor bolts. It is characterized by the fact that a base is installed.

  The invention according to claim 2 is the tower crane support structure according to claim 1, wherein the concrete wall is a seismic wall.

  Invention of Claim 3 is a construction method of the support structure of the tower crane of Claim 1 or 2, Comprising: An anchor bolt is set and wall reinforcement, concrete is laid, and a receiving beam is carried out. After constructing the concrete wall of the supporting floor, when placing the concrete of the upper floor wall during the period until the specified strength is developed in the concrete of the concrete wall, the concrete wall of the floor where the receiving beam is installed The useless openings for the receiving beams are opened at the opposite positions, and both ends of the receiving beams inserted into the useless openings are placed on the upper end surfaces of the opposing concrete walls, and screwed to the anchor bolts. It is characterized in that both ends of the receiving beam are fastened and fixed to the concrete wall with nuts, and then the tower crane base is installed on the receiving beam.

  According to the first aspect of the present invention, the tower crane support structure in which the tower crane base is supported by the building frame can be constructed easily and at low cost.

  That is, according to the present invention, both ends of the receiving beam are placed on the upper end surfaces of the opposing concrete walls, fixed to the concrete wall by anchor bolts, and the base of the tower crane is installed on the receiving beam. Since the load is supported by the temporary reinforcing member for the beam and the cost for it is not generated.

  As a member for attaching the receiving beam, an anchor bolt that is cheaper than PC steel is only added, and it is only necessary to set the anchor bolt when constructing the concrete wall. Tightening work of PC steel bars using such hydraulic jacks, work to remove the PC steel bar tension and remove the bracket, and work to close the PC steel bar insertion through hole after removal of the bracket and PC steel bar It is unnecessary and has good workability.

  Moreover, since the receiving beam is placed on the upper end surface of the concrete wall, the tower crane load acts on the concrete wall vertically from above, and no bending stress acts on the concrete wall. Also, no reinforcement against bending is required.

  As a result, the tower crane support structure can be constructed easily and at low cost.

  The concrete wall may be either a seismic wall or a non-seismic wall. However, when the concrete wall is a seismic wall as in the invention described in claim 2, the amount of reinforcing bars increases in order to satisfy seismic performance. It is suitable because it can withstand a large load.

According to invention of Claim 3, the support structure of the tower crane which has said effect can be implement | achieved. In addition, floor climbing is possible even in a structure where there is no beam in the center of the building.

  1 to 6 show an embodiment of the present invention. A is a tower crane installed in a building, and includes a crane body 1, a mast 2 that supports the crane body 1 to be movable up and down, and a lifting device 3. The elevating device 3 includes an upper elevating frame having an upper kanuki, a lower elevating frame having a lower kanuki, an elevating drive device including a hydraulic cylinder and the like.

B shows the support structure which supports the base (the leg part of the mast 2) 4 of the tower crane A with the frame of a building. This support structure B is a seismic wall (this is an example of a concrete wall) that serves as a building frame (in the example shown, a core wall that forms an atrium-like space in which a multi-story parking lot is installed inside the building). .) Of the plurality of anchor bolts 6 having secured anchoring lengths capable of withstanding the pulling force are embedded in the opposing earthquake resistant walls 5 with their upper ends protruding from the upper end surface of the earthquake resistant wall 5. Both ends of two steel receiving beams 7 placed on the upper end surfaces of the opposing earthquake resistant walls 5 are fixed to the earthquake resistant walls 5 by the anchor bolts 6, and a tower crane A is mounted on the receiving beams 7. The base 4 is installed.

Reference numeral 8 denotes a fixing nut screw-fitted to the upper end portion of the anchor bolt 6, and both ends of the receiving beam 7 are connected to the seismic wall 5 via the receiving beam presser 9 placed on the end of the receiving beam 7. It is fastened and fixed to the upper end surface. Reference numeral 10 denotes a horizontal connecting member erected between the vicinity of both ends of the receiving beam 7 and is connected to the upper flange of the receiving beam 7 with bolts and nuts. Reference numeral 11 denotes both screw bolts that connect the base presser foot 12 and the backing plate 13 fixed to the upper flange of the receiving beam 7, and 14 denotes a fixing nut that is screwed to the both screw bolts 11.

In the illustrated embodiment, an anchor frame 16 connected to the lower end of the anchor bolt 6 with a nut 15 is embedded in the earthquake resistant wall 5 in order to secure a fixing length that can withstand the pulling force of the anchor bolt 6. is there. Reference numeral 17 denotes a useless opening for the receiving beam. After the receiving beam 7 is removed, the concrete is blocked on the spot.

  The above-described support structure B of the tower crane A is constructed by the following procedure, for example. First, the wall layout of the seismic wall on the floor supporting the receiving beam 7 (for example, when the receiving beam 7 is installed on the third floor, the seismic wall on the second floor becomes the seismic wall on the floor supporting the receiving beam 7). Prior to the muscle, the anchor bolt 6 is set at a predetermined position.

  Next, wall reinforcement is performed and concrete is placed in the formwork to construct a seismic wall (for example, a seismic wall on the second floor) 5 on the floor that supports the receiving beam 7.

  After that, when placing the concrete of the earthquake resistant wall 5 for the two upper floors during the period until the predetermined strength is developed in the concrete of the earthquake resistant wall 5, the floor on which the receiving beam 7 is installed (this is the receiving beam 7). In the seismic wall (for example, the seismic wall on the third floor) 5 of the floor supporting the above, a useless opening 17 for receiving beams is opened at a position facing each other.

Then, both end portions of the receiving beam 7 inserted into the useless openings 17 are placed on the upper end surfaces of the earthquake-resistant walls 5 facing each other, and both end portions of the receiving beam 7 are attached to the anchor bolts 6 with screws 8. Seismic wall 5
Then, the base 4 of the tower crane A is installed on the receiving beam.

When performing the floor climbing of the tower crane A, for example, as shown in FIGS. 7 and 8, two sets of the above-described receiving beams 7 are prepared, and a useless opening 17 is provided in advance on the seismic wall of the floor on which the climbing is performed. Form it.

  Then, as shown in FIG. 8, a reaction force is applied to the earthquake-resistant wall above the floor where climbing is performed, and the first receiving beam 7 and the base on the floor where the tower crane A is installed are separated from each other, and the lifting device 3 raises mast 2. In this state, both ends of the second receiving beam 7 are inserted into the useless openings 17 of the earthquake-resistant wall of the floor where climbing is performed, and fixed to the earthquake-resistant wall with the anchor bolts.

Next, after collecting the first receiving beam 7 from the lower useless opening 17, wall reinforcement and concrete placement are performed on the useless opening 17, and the useless opening 17 is closed as shown by a broken line in FIG. 9. To do. And the crane main body 1 is raised with respect to the mast 2 by the raising / lowering device 3, and an upper-layer construction work is performed.

According to said structure, the both ends of the receiving beam 7 are mounted in the upper end surface of the opposing earthquake-resistant wall 5, and it fixes to the earthquake-resistant wall 5 with the anchor bolt 6, and the base 4 of the tower crane A is attached to the receiving beam 7 Since it installed and was made to support a load with the seismic wall 5, the temporary reinforcement member with respect to a beam and the cost for it do not generate | occur | produce.

  As a member to which the receiving beam 7 is attached, only an anchor bolt 6 which is cheaper than PC steel is added, and it is only necessary to set the anchor bolt 6 when the earthquake-resistant wall 5 is constructed. PC steel bar tension work (pre-stress introduction work) using a hydraulic jack, such as when the bracket is crimped and joined to the surface with PC steel, and the tower crane base is installed on the bracket. Complex work on site such as removal work, closing work of PC steel rod insertion through-hole after removal of bracket and PC steel rod is unnecessary, and workability is good.

  Since the receiving beam 7 is placed on the upper end surface of the seismic wall 5, the load of the tower crane A acts on the seismic wall 5 vertically from above, and no bending stress acts on the seismic wall 5. No reinforcement against bending, such as the introduction of

  As a result of these, the tower crane support structure B in which the base 4 of the tower crane A is supported by the building frame can be constructed easily and at low cost.

  Although the present invention is suitable for floor climbing a tower crane, it can of course be implemented as a tower crane support structure for mast climbing.

It is a vertical front view which shows the support structure of the tower crane which concerns on this invention. It is a cross-sectional top view of the principal part. It is a vertical front view of the principal part. It is a vertical side view of the principal part. It is an enlarged vertical front view of the principal part. It is an expanded vertical side view of the principal part. It is explanatory drawing of floor climbing. It is explanatory drawing of floor climbing. It is explanatory drawing of floor climbing.

Explanation of symbols

A Tower crane B Support structure 1 Crane body 2 Mast 3 Lifting device 4 Base 5 Earthquake resistant wall (concrete wall)
6 Anchor bolt 7 Receiving beam 8 Nut 9 Presser foot for receiving beam 10 Horizontal tether 11 Double screw bolt 12 Presser foot for base 13 Backing plate 14 Nut 15 Nut 16 Anchor frame 17 Useless opening for receiving beam

Claims (3)

  A support structure that supports the base of a tower crane, and among the concrete walls that form the building frame, a plurality of anchor bolts protrude from the top surface of the concrete wall to the opposite concrete walls. Both ends of the receiving beam embedded in the upper end surface of these concrete walls are fixed to the concrete wall by the anchor bolts, and a tower crane base is installed on the receiving beam. Support structure for tower crane.   2. The tower crane support structure according to claim 1, wherein the concrete wall is a seismic wall.   It is the construction method of the support structure of the tower crane of Claim 1 or 2, Comprising: The anchor bolt was set and wall reinforcement, the concrete was laid, and the concrete wall of the floor which supports a receiving beam was constructed. Later, when placing the concrete of the upper floor wall during the period until the predetermined strength is developed in the concrete of the concrete wall, the concrete wall of the floor where the receiving beam is installed is placed in a position opposite to the concrete wall of the floor. Leave no openings, place both ends of the receiving beams inserted into these openings on the top surface of the opposing concrete wall, and attach both ends of the receiving beams to the concrete with nuts that are screwed into the anchor bolts. A method for constructing a tower crane support structure, wherein the tower crane base is fastened to a wall and then the tower crane base is installed on the receiving beam.

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