JPH01284634A - Method for constructing reinforced concrete structure - Google Patents

Abstract

PURPOSE:To improve construction efficiency by lifting a beam-frame and a column-frame used in a lower floor up to an upper floor through a slab opening portion and independently constructing a column concrete, a beam concrete and a slab concrete. CONSTITUTION:After a beam concrete is deposited in a beam-frame 2 in the periphery of a slab, prefabricated column reinforcing bars 4 are lifted and column main reinforcements 5 thereof are connected to column main reinforcements 5 projected from the upper surface of lower column concretes 6. Secondly, column-frames 7 are lifted through a slab opening portion 1 and disposed on the beam concrete 3 in such a manner as to surround the column main reinforcements 5. Beam-frames 2 are lifted through the slab opening portion 1 and installed at designated positions. The column concretes 6 are deposited in the column-frames 7, prefabricated beam reinforcing bars 9 are disposed in the beam-frames 2, beam concretes 3 are deposited, a slab reinforcement is disposed in the slab opening portion 1, and slab concrete is deposited. Thus, construction efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for constructing a reinforced concrete structure that can easily and efficiently construct a high-rise reinforced concrete structure.

[Conventional technology]

Conventionally, as a method for constructing high-rise reinforced concrete structures, as published in Japanese Patent Publication No. 62-42100, prefabricated column reinforcing bars are erected at predetermined positions, and column formwork is installed around them. A beam formwork that extends in one direction is erected between the column formworks, and then a large floor formwork that is integrated with the beam formwork that extends in the other direction is installed. After concrete is poured in the area and the concrete has hardened, prefabricated beam reinforcement consisting of 11 beam reinforcement extending in two directions orthogonally arranged is placed inside each beam form, and slab-type reinforcement is placed inside each beam form. A method is known in which slab reinforcement is placed on the frame and then concrete is poured for the beam and floor sections.

[Problem to be solved by the invention]

[Construction of the Conventional Reinforced Concrete Structure]] Method No. I: Since it is not possible to place concrete and floor concrete until the reinforcement of the prefabricated beam reinforcing bars and the floor reinforcing bars of the entire floor are completed, Poor construction efficiency and the entire floor between the beams is concrete =! Since the concrete is poured at a -degree, there are no openings in the floor, so it is not possible to lift column forms, beam forms, etc. used on the lower floors from the lower floors and transport them to the upper floors.

This invention enables column concrete, column concrete, and slab concrete to be performed independently and with high efficiency.
The purpose of the present invention is to provide a method for easily and efficiently constructing a reinforced concrete structure by quickly transporting column formwork and beam formwork used on lower floors to upper floors through slab openings. It is something.

[Means for solving problems]

In order to achieve the above object, in the method for constructing a reinforced concrete structure of the present invention, a beam 1-3 is cast inside the beam formwork 2 around the slab, leaving the slab opening 1, and then the prefabricated The beam reinforcing bars 4 are lifted up to the upper floor, and the lower end of the column main reinforcing bars 5 passing through the prefabricated column reinforcing bars 4 is connected to one end of the column main reinforcing bars 5 protruding from the top surface of the company concrete 6 on the lower floor, and then Said slab opening 1 from the floor
The column formwork 7 is lifted to the upper floor through the upper floor, and the column formwork 7 is installed so as to surround the column reinforcing bars above the concrete beam 3, and the column formwork 7 is lifted from the lower floor through the slab opening 1'' part I. Then, the beam form 2 is hung on the upper floor, the beam form 2 is installed in a predetermined position, and then the column concrete 6 is poured into the column form 7, and the above-mentioned two-layer Prefabricated beam reinforcing bars 9 in which slab reinforcing bars 8 have been incorporated in advance are placed inside the beam formwork 2 of the floor, and beam concrete 3 is poured. Slab reinforcement 10 is arranged and slab concrete 11 is placed in the slab opening 1 surrounded by -I.

〔Example] Next, the present invention will be explained in detail using illustrated examples.

When constructing a reinforced concrete structure by carrying out this invention, first, as shown in FIGS. 14 and 15, prefabricated beam reinforcing bars 9 into which slab reinforcing bars 8 have been incorporated are assembled, and then As shown in FIGS. 1 to 3, a prefabricated beam reinforcing bar 9 incorporating the insert reinforcing bars 8 is housed in the beam form main body 2A, and the upper end side beam has a large number of insert reinforcing holes. With the insertion bar 8 inserted into the insertion bar insertion hole in the formwork 2B, connect the lower part of the upper side beam formwork 2B to the two ends of the beam form body 2Δ using bolts, etc. Ingredients 2
], and then the insert bar 8Δ at the end of the beam.
is inserted into the beam formwork 2 of the same level consisting of the beam form main body 2A and the pair of upper end side beam forms 2B. Then, concrete beam 3 is poured leaving slab opening 1.

After the beam concrete I.3 has hardened to the extent that it will form, for example, after about 4 hours, as shown in the 4th article, the prefabricated column reinforcing bars 4 are inserted through the slab opening ``through part 1'' into the two-story floor. The lower end of the column main reinforcement 5 that passes through the prefabricated column reinforcement 4 and the two ends of the column main reinforcement 5 protruding from the top surface of the column concrete 6 on the lower floor are welded, pressure welded, and connected with a one-lap joint or sleeve. Connected via a mechanical joint 12 such as a joint,
Hoop reinforcement 13 located near the joint of the upper and lower column main reinforcements
Place reinforcement.

Next, the column formwork 7 removed from the column concrete 6 on the lower floor is lifted to the upper floor through the slab opening 1 by a crane, and then, as shown in FIG. The beam formwork 2 is assembled to surround the prefabricated beam reinforcing bars 4 on the floor except for the upper part, and then the beam formwork 2 is removed from the concrete beam 3 on the lower floor, and is lifted to the upper floor through the slab opening 1 by a crane. As shown in FIG. 6, the beam form main body 2A is arranged so as to extend over two parts of the column form 7 on the upper floor, and the beam form main body 2A is
．． 14 or a temporary support shrine such as a temporary pillar.

Both ends of the temporary structure 1.14 are placed on a support beam 22 made of a square steel tube, and the support beams 1 and 22 are placed on a support member 23 made of angle iron fixed to the column form 7. A temporary anchor port 24 with a nut screwed therethrough is inserted through the column formwork 7 and the support member 23.

Next, as shown in Fig. 7, after pouring the column concrete 6 into the column formwork 7, as shown in Figs. The beam reinforcing bars 9 are connected at the upper part of the beam form main body 2Δ, and then the connected prefabricated beam reinforcing bars 1] are dropped into a predetermined position in the beam form main body 2A as shown in FIG. With the insert bar 8 inserted into the insert length through hole in the upper end side beam formwork 2B having the insert length through hole,
The lower part of the upper end side beam formwork 2B is removably connected to the two ends of the beam formwork main body 2A by a bolt cap connecting tool 2■,
Next, after inserting the reinforcing bars at the beam ends across the insertion distance through holes in the pair of opposing beam formworks 213 at one end, as shown in FIG. A concrete beam 3 is poured into a beam form 2 of the same level, which is made up of a side beam form 213 at one end.

The same work is then repeated to construct high-rise reinforced concrete structures one by one. FIG. 10 shows the completed reinforced concrete structure 1 with only the slab remaining.

Construction of the slab will be carried out at any time after the construction of columns and beams. When constructing a slab, first refer to Figure 11 and 1.
As shown in FIG. 2, the upper surface of the periphery of the slab formwork I5 is brought into contact with the 1ζ surface of the flange 16 for configuring the slab periphery that is connected to the upper end side of the concrete beam 3, and the slab formwork 15
A large number of square steel pipe tank flap members 17 are arranged on the lower surface of the flange 16, and a fixing bolt I inserted through the botasho 17 and the slab formwork 15 is inserted into the insert 18 that is embedded and fixed in the flange 16.
9 are screwed together, and the slab formwork I5 is fastened to the flange I6 via the bolt 17 using the fixing bolts 19 (=1 is fixed).

Next, after suspending the prefabricated slab reinforcement 10 to a predetermined position on the slab formwork 15, the end of the slab main reinforcement 20 that is LJ to the slab reinforcement 10 and the end to the insert reinforcement 8.8 are are overlapped and connected by welding or bundling, and reinforcing bars extending in a direction orthogonal to the reinforcing bars are placed over the overlapped part of the reinforcing bars and are joined by bundling, and then, as shown in FIG. 13, the slab formwork 15 A concrete slab 11 is placed on top of the concrete slab.

In the case of the above embodiment, the fixing pole 19 inserted through the slat material J7 and the slab formwork 15 is screwed into the insert J8 embedded in the already hardened flange 16 to form the slab formwork 15. Since it is tightened and fixed to the underside of the flange 16, there is no need to use support from the floor (slab formwork 15
can be supported.

When carrying out this invention, concrete having different strengths may be used as the concrete beam 3 and the concrete slab I.11. In this case, for example, high-strength concrete is used as the beam concrete 3, and low-strength concrete is used as the slab concrete 11.

〔Effect of the invention〕

Since this invention is configured as described above, it produces the effects described below.

Column concrete 6, beam concrete 3, and slab concrete 11 can be cast independently, and the column formwork 7 and beam formwork 2 used on the lower floor can be placed in the slab opening 1.
It can be quickly lifted up and transported through the tunnel and installed on upper floors, thereby improving the construction efficiency of reinforced concrete structures.

In addition, since the slab reinforcing bars 8 are pre-installed in the prefabricated beam reinforcing bars 9, it is possible to reduce the effort of arranging slab reinforcement during slab concrete I/placement, and the column formwork 7 can be replaced with the beam formwork. Since the beam formwork 2 and the slab formwork 15 are separate from each other, each formwork to be transported by hanging can be made smaller, making it easier to transport by hanging. Moreover, after the concrete 13 around the area where the slab is to be constructed has hardened, the slab reinforcement 10 can be placed at any rib point and the slab concrete 11 can be placed. The workability of the product is good, and concrete beams 3 and concrete slabs 11 having desired strengths can be used.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention, in which Fig. 1 is a plan view showing the concrete beam being poured, Fig. 2 is a sectional view taken along the line 8-∆ of Fig. 1, and Fig. Fig. 4 is a longitudinal side view showing a part of Fig. 2 enlarged; Fig. 4 is a longitudinal side view showing the state in which prefabricated column reinforcing bars have been added; Fig. 5 is a longitudinal side view showing the state in which the column formwork is installed; 61a is a longitudinal side view showing a state in which the beam formwork is installed; FIG. 7 is a longitudinal side view showing a state Jm in which column concrete is placed in the column formwork and prefabricated beam reinforcing bars dropped into the beam form; Figure 8 is a longitudinal side view showing the state in which prefabricated reinforcing bars are placed in the beam formwork, Figure 9 is a longitudinal side view showing the state in which beam concrete is poured into the beam formwork, and No. 10 of the structure. A cross-sectional plan view showing the frame; Fig. 1J is a vertical cross-sectional side view showing the condition when the slab reinforcement is suspended above the slab formwork; Fig. 12 is a vertical cross-sectional side view showing an enlarged part of Fig. 11; FIG. 13 is a vertical sectional side view showing a state in which slab concrete is placed. Fig. 14 is a plan view showing a prefabricated beam reinforcing bar with insert reinforcement of slab reinforcement, and Fig. 15 is a plan view showing a prefabricated beam reinforcing bar with insert reinforcement of slab reinforcement.
f is an enlarged sectional view. In the figure, 1 is the slab opening, 2 is the beam formwork, 3 is the concrete, 4 is the prefabricated column reinforcement, 5 is the main column reinforcement, 6 is the column concrete, 7 is the column formwork, 8 is the insertion reinforcement of the slab reinforcement,
9 is prefabricated beam reinforcement, 10 is slab reinforcement, 11 is slab concrete, 14 is temporary beam, 15 is slab formwork,
16 is a flange for configuring the peripheral edge of the slab, 17 is a porcelain material, 18
is an insert, and 19 is a fixing bolt.

Claims (1)

[Claims] After placing beam concrete 3 in the beam formwork 2 around the slab, leaving the slab opening 1, the prefabricated column reinforcing bars 4 are hoisted to the upper floor, and the lower ends of the column main reinforcements 5 in the prefabricated column reinforcing bars 4 are connected to the lower floor. The column formwork 7 is connected to the upper end of the main column reinforcement 5 protruding from the top surface of the column concrete 6, and then the column formwork 7 is lifted from the lower floor through the slab opening 1 to the upper floor. , the concrete beam 3 is installed so as to surround the column reinforcing bars above the concrete beam 3, and the beam form 2 is lifted from the lower floor through the slab opening 1 to the upper floor, and the beam form 2 is placed in a predetermined position. The column concrete 6 is placed in the column formwork 7, and the column concrete 6 is placed in the beam formwork 2 of the upper floor.
Prefabricated beam reinforcing bars 9 in which slab reinforcing bars 8 have been incorporated in advance are placed and beam concrete 3 is poured, and at an arbitrary point after the beam concrete has hardened, it is placed in the slab opening 1 surrounded by the beam concrete. , a construction method for a reinforced concrete structure in which slab reinforcement 10 is arranged and slab concrete 11 is poured.