JPH03279533A - Constructing method for rigid-frame type rc super-high building - Google Patents

Abstract

PURPOSE:To make the constructing of a building with high efficiency, excellent quality and high precision kept in its process possible by executing the construction of a half PCa beam unit and of a half PCa floor plate, and the arrangement of reinforcements for floor slabs after erecting pillars, and depositing concrete for the beam and slab. CONSTITUTION:After preassembled pillar reinforcing bars are hung down, and connected to lower floor pillar reinforcing bars 2, 2 projecting from the upper face of a floor slab 1, a pillar mold 6 is erected, and concrete for a pillar is deposited. After the concrete hardens, a half PCa beam unit 8, which is previously formed into plus shape, T-shape and L-shape or the like, is constructed, and lower main reinforcements 10... correspondent to an adjacent half PCa beam unit 8 are mutually connected, and such works as the construction of a half PCa floor plate 15, the installation of frameworks for beam connecting parts, the connection of upper main reinforcements 13... for a beam and the arrangement of reinforcements 17 for a floor slab are then executed. The concrete 18 for the beam and slab is then deposited to unite the pillar, beam and floor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a method of constructing a rigid frame type RC super high-rise building.

Note that "rPca" in the present invention means "precast concrete."

(Problems to be solved by the invention and its characteristics) Most conventional high-rise buildings are made of rigid-frame SRC structures, but RC structures are more advantageous than SRC structures in terms of construction period and cost.

The purpose of the present invention is to provide a construction method that can construct rigid-frame reinforced concrete super high-rise buildings with high efficiency, high quality, and high precision, and which has the advantages described above. The features are as described in the claims.

(Example) FIG. 1 is a perspective view showing the steps of an example of the present invention.
Construction will be carried out in the order indicated by the arrows.

A shows a state in which the ends of the column reinforcing bars 2 on the lower floor protrude from the upper surface of the floor slab 1.

First, the previously assembled column reinforcing bars 3 are suspended above the column reinforcing bars 2 on the lower floor (state B), the main bars of the column reinforcing bars 2 and 3 are connected to each other by, for example, enclosure welding, and then the column head formwork is 4
After the column formwork 6 consisting of the main body part formwork 5 is suspended and set (state C), column concrete is placed by the concrete pouring device 7 (state D).

After the column concrete has hardened, remove the main body formwork 5 leaving the column head form 4 in the shape of E wA), suspend the half-PCa beam unit 8 (state of F), and erect it on the column head. .

The half-PCa beam unit 8 is made by converting a predetermined length portion of each end of a beam in two directions that intersect into a half-PCa. 2 (A), a T-shape as shown in FIG. 2(B), and an L-shape as shown in FIG. 2(C). The length of each beam portion 9 is approximately half the beam span.

The half-PCa beam unit 8 is constructed by fixing the intersection of the lower main reinforcements 1O embedded in the half-PCa beam part 9 with clamps (not shown), and further fixing the intersection part between the side surfaces of the adjacent half-PCa beam part 9.9. With turnbuckle 11 attached as shown,
It is lifted by a hanging jig 12 and carried to the column head, but at this time, the upper main reinforcement 13 of the beam is temporarily placed on top of the half-PCa beam part 9 as shown in the figure.

In the figure, 14 is a cap attached to the tip of the main bar of the column reinforcing bar 3 so that the half-PCa beam unit 6 can be smoothly constructed.

The opposing lower main reinforcements 10 of the adjacent semi-PCa beam units 8 whose construction has been completed are sequentially connected at the center of the span, for example, by enclosure welding, and in parallel with this, the semi-PCa floor plate 15 which also serves as the formwork is erected. Furthermore, after installing the formwork 16 at the joint of the beam, connecting the upper main reinforcement 13 of the beam, and arranging the reinforcing bars 17 of the floor slab, the beam/slab concrete 18 is poured using the concrete pouring device 6. Then, the pillars, beams, and floor are integrated (G shape n>.

As described above, each floor is constructed to complete a super high-rise building with a predetermined number of floors.

(Effects of the Invention) The construction method of the rigid-frame RC super high-rise building of the present invention is as described above. The use of column formwork consisting of half-PCa, which is preformed in the on-site production yard into earthen walls, T-shape, and L-shape according to the intersection of the beams at the column head.
The beam unit is suspended from the column head, and the floor slab is made of semi-PCa floorboards that also serve as formwork.
By integrating these factors, it is possible to construct high-quality, high-precision rigid-frame RC high-rise buildings extremely efficiently, and the construction period can be greatly shortened.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the process of an embodiment of the present invention, and Figs. 2 (A), (B>, and (C) are plan views of a half-PCa beam unit. 1. Varnish slab, 2.3: Column. Rebar, 4: Column head formwork, 5: Main body formwork, 6: Column formwork, 7: Concrete placement equipment, 8
: Half PCa beam unit, 9: Half PCa beam section, lO: Lower main reinforcement, 13: Upper main reinforcement, 15: Half PCa floor plate,

Claims (1)

[Claims] After suspending the preassembled column reinforcing bars and connecting them to the column reinforcing bars on the lower floor protruding from the top of the floor slab, the column formwork consisting of the main body formwork and column head formwork is erected, and the column concrete is assembled. After the columns have hardened, the column head formwork is preliminarily molded into +-, T-, and L-shapes at the on-site production yard, depending on the intersection of the beams at the column head. Formed half PC
The A-beam unit was suspended and erected from the column head, and the corresponding lower main reinforcements of the adjacent half-PCa beam units were connected to each other, and the half-PCa floor plate that also served as the formwork was erected. A rigid frame type RC that is characterized by installing the formwork, connecting the upper main reinforcement of the beam, and arranging the reinforcement of the floor slab, and then pouring beam/slab concrete to integrate the columns, beams, and floor. Construction method for high-rise buildings.