JP2876991B2 - Steel frame method for high-rise buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel frame method for a high-rise building in which a steel frame on a top floor can be formed using a work stage.

[0002]

2. Description of the Related Art As a construction method of a high-rise building, a work stage having a roof structure is raised every time each floor is constructed.
There is a construction method in which construction is carried out while lifting materials with an overhead crane provided in this area, and it is adapted to all weather conditions and safety is enhanced. Also, a method has been developed in which the work stage is not removed after the completion of the construction, but is diverted to a steel frame structure on the top floor, for example, a method of constructing a steel frame material in a high-rise building disclosed in JP-A-03-87438. I have.

In this construction method, a building is constructed under the truss structure of the building work stage while sequentially raising the beam, and when the construction is completed, the beam is installed at the top of the construction portion and this is left as it is. It is diverted to the steel frame structure on the top floor.

[0004] The truss assembly structure constituting the beam is composed of an upper chord material, a lower chord material, and a bundle material connecting them.
The upper chord is the beam on the top floor and the lower chord is the beam on the lower floor,
The bundle was extended downward and connected to the top of an existing pillar to form a two-story steel frame structure.

[0005]

However, since the overhead traveling crane and its accessories are provided on the work stage, it is necessary to disassemble these accessories in order to convert the work stage. A temporary scaffold must be assembled and then dismantled using the scaffold as a scaffold, and the number of steps required for the temporary scaffold is increased.

The present invention has been made to solve the above problems, and an object of the present invention is to convert a work stage to a steel frame of a building without using a temporary scaffold to remove accessories of the work stage. An object of the present invention is to provide a steel frame method for a high-rise building which can be easily dismantled and removed.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an elevating and lowering apparatus for an architectural work stage provided with a truss-structured beam mainly composed of an upper chord material, a lower chord material, and a bundle material connecting these members. In the method of building up to the top floor of a high-rise building while ascending through, after building to one floor below the top floor, the beam is lowered to a proper position on the upper surface of the lower floor by the elevating device. The overhead crane installed at the lower part of the beam is dismantled and removed, then the beam is further lowered to connect the bundle to the top of the downstairs pillar, and further dismantle and remove the lower chord, thereby performing the work. It is characterized in that the upper chord and bundle of the stage for the building are steel frames on the top floor of the building.

[0008]

According to the above construction, the work stage is diverted to the frame of the top floor of the corresponding building. When diverting, the overhead crane and its many accessories can be dismantled and removed using the floor below the floor as a scaffold, so that temporary support for dismantling is not required.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. 1 (a) to 1 (d) are explanatory diagrams of the construction procedure of the top floor when the method of the present invention is applied to the construction of a building having a 26-story PCa structure. The building in the figure is a PCa building in which the beams 1 and the columns 2 are assembled in a ramen structure. In (a), the building is completed up to the 25th floor, which is one floor below the top floor, and the upper part has a predetermined height. And is covered by the work stage 3 and is in a construction preparation state on the top floor.

The work stage 3 includes a beam 4, a sheath tube 6 which is suspended from an outer end of the beam 4, and which is inserted around an outer periphery of a plurality of rack columns 5 temporarily fixed to an outer wall of an existing portion of the building. Sheath tube 6
A plurality of lifting / lowering devices 7 that are arranged at the upper end of the rack 4 and engage with the rack columns 5 to raise and lower the work stage 3; Although not shown, the lifting device 7 includes a pinion meshed with the rack column 5 and a drive motor for normal / reverse rotation of the pinion.

The beam 4 is mainly composed of an upper chord member 4a, a lower chord member 4b, and a bundle member 4c for connecting the upper chord member 4a, and has a truss assembly structure in which these members are connected by a brace (oblique beam) 4d. A temporary roof (not shown) is stretched over the upper portion 4a, thereby enabling construction corresponding to all weather.

The upper chord member 4a and the bundle member 4c are to be later diverted as members on the top floor of the building, and the cross section of the member is determined on the premise of this, and the member cross section of the lower chord member 4b is determined accordingly. A truss using the members of the upper chord member 4a and the bundle member 4c has a minimum necessary member cross section capable of exhibiting structural strength required as a work stage. In addition, bundle material 4c
Is desirably arranged just above the existing pillar.

When the construction of the 25th floor is completed, the beam 4 descends by lowering the elevating device 7, and the overhead crane 8 approaches the vicinity of the floor on the 26th floor. As shown in b), accessories such as the overhead crane 8 and the crane gutter can be dismantled and removed without requiring a temporary scaffold.

After the removal operation is completed, the elevating device 7 is further moved down, as shown in FIG.
And the bundles land on the floor of the 26th floor. In this state, the bundle 4b is arranged on the same vertical line as the existing column 2. At this stage, the bundle is connected to the upper end of the existing pillar 2 via bolts, etc.
After the connection work is completed, the lower frame member 4b and the brace 4d are removed, and the rack pillars 5, the sheath pipe 6, the lifting device 7, and other accessories are removed to obtain a steel frame structure on the 26th floor, which is the top floor. be able to.

Both the lower chord material and the brace 4d can be removed using the ceiling surface of the 25th floor as a foothold. Further, the removed lower chord material 4b can be used for a steel frame structure such as a penthouse, and a jib crane or the like is used for moving these and removing the outer wall surface of the building.

Thereafter, as shown in (d), reinforcing bars are arranged around the upper chord member 4a and the bundle member 4c as necessary, a form is set, concrete is cast, SC is made, or S is made.
The 26th floor, which is the top floor, can be completed by RC construction.

The top floor may be made of S, and furthermore, the top floor may be used as a penthouse, and parts of the work stage not used as the penthouse may be left as they are. In this case, a blindfolding shroud is provided around the periphery.

[0018]

As described in detail in the above embodiments, in the steel frame method for a high-rise building according to the present invention, when the work stage is diverted to the steel frame on the top floor of the building, Since a temporary scaffold is not required for dismantling and removing the accessory, it is suitable for shortening the construction period.

[Brief description of the drawings]

FIGS. 1A to 1D are explanatory diagrams showing a construction procedure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing beam 2 Existing column 3 Work stage 4 Beam 4a Upper chord material 4b Lower chord material 4c Bundle material 7 Elevating device 8 Overhead crane

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kohei Kurita 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Corporation Technical Research Institute (56) References JP-A-3-87438 (JP, A) JP-A-7 -286369 (JP, A) JP-A-5-321472 (JP, A) JP-A-4-357226 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04G 21/14, 1 / 35,1 / 20

Claims (1)

(57) [Claims] 1. An architectural work stage provided with a truss-structured beam mainly composed of an upper chord material, a lower chord material, and a bundle material connecting them, is constructed up to the top floor of a high-rise building by ascending through an elevating device. In the method, after building up to one floor below the top floor, dismantling and removing the overhead crane installed at the lower part of the beam in a state where the beam is lowered to an appropriate position on the upper surface of the lower floor by the elevating device Then, further lowering the beam to connect the bundle to the top of the downstairs pillar, and further removing the lower chord, the upper chord and the bundle of the work stage at the top floor of the building. A steel frame method for a high-rise building characterized by using a steel frame.