JPH0123632B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing earthquake-resistant walls for prefabricated buildings, and in particular, in a construction method for mid- to high-rise prefabricated buildings, precast wall slabs that are built continuously in the vertical direction of a structure frame are assembled. The chord members, lattice bars, and gusset plates of the steel beam are built in, and the precast wall slabs on the upper and lower floors are joined to form an assembled steel beam, and the opposing parts are buried with cast-in-place concrete floor slabs to form an integrated steel beam. By using concrete beams, a structure with excellent earthquake resistance can be constructed efficiently.

Conventionally, the walls of prefabricated buildings have been built using a construction method in which precast wall slabs are erected after creating floor slabs, which requires a large amount of construction cost and time to join the walls and floors. There is a problem that the joint concrete and mortar grout filled between the floor slab and the floor slab shrink after hardening, so they are not completely integrated.As a construction method to deal with this problem, stud bolts or reinforcing bars etc. are installed at the upper end. Shear connectors protrude from the steel frame, and wall precast slabs made up of a steel-framed concrete beam with a recess at the lower end are erected in a continuous manner vertically, and a floor formwork is installed at the opposing part. After floor reinforcement is placed, cast-in-place concrete is poured into this floor form, and the lower end of the pre-cast wall plate on the upper floor and the upper end of the pre-cast wall plate on the lower floor are simultaneously buried using the cast-in-place concrete. A construction method is known in which the two parts are integrated (see Japanese Patent Publication No. 7647/1983).

However, in the above construction method, the wall precast slabs built continuously on the upper and lower floors are only integrated with each other by the cast-in-place concrete floor slab, and the upper end of the wall precast slab is integrated with the wall precast slabs. The buried steel beams are not connected to each other and function as beams independently on each floor, so their overall rigidity and toughness are not sufficient, making them susceptible to earthquakes. There was a problem in that bending deformation occurred when a large horizontal force was applied to the wall, making it impossible to obtain satisfactory safety and reliability as a seismic wall.

This invention was made in order to solve the above-mentioned problem, and the purpose of this invention is to form an assembled steel beam that is continuous between upper and lower floors using a precast wall slab that incorporates the constituent members of the assembled steel beam. It is an object of the present invention to provide a shear wall construction method in which cast-in-place concrete is cast in the opposing parts of precast wall slabs on upper and lower floors to form steel concrete beams. In particular, a further object of the present invention is to provide a construction method for efficiently constructing a prefabricated building with excellent earthquake resistance.

That is, in the present invention, as in the illustrated embodiment, the chord members 12 of the steel beam are built in with their upper surfaces exposed on the same plane along the length direction of the upper end surface,
A gusset plate 16 is built into the lower end surface with its lower edge protruding, and a lattice bar 18 is attached between the chord material 12 and the gusset plate 16, and the precast wall slabs 10 and 10a are integrally formed.
The lower end edge of the gusset plate 16 of the precast wall slab 10 on the upper floor is connected to the upper surface of the chord member 12a of the precast wall slab 10a on the lower floor that faces it, and the assembled steel beam is constructed continuously in the vertical direction. constitutes,
After installing the floor formwork 36 at the opposing parts of the precast wall slabs 10 and 10a on the upper and lower floors, the lower ends of the precast wall slabs 10 on the upper floor and the precast wall slabs 10 on the lower floor are installed.
This relates to a method for constructing a shear wall for a prefabricated building, characterized in that the upper end of the a is buried in cast-in-place concrete and integrated.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, the precast wall slab 10 has a built-in chord member 12 made of T-beam steel along its upper end, and the upper surface of the chord member 12 is located above the precast wall slab 10. Expose on the same plane as the end face. A plurality of stud bolts 14 are fixed and protruded from the upper surface of the chord member 12 by welding or the like except for a portion thereof. The lower end surface of the precast wall slab 10 forms a recess 20, and the lower end edge of the gusset plate 16 below the lower end surface projects and is housed therein. A lattice bar 18 is attached by welding between the chord member 12 and the gusset plate 16, and these members are integrally molded. Recesses 22 are also formed on both left and right end faces of the precast wall slab 10, similar to the lower end face. Reference numeral 24 indicates an anchor reinforcement, 26 a reinforcing reinforcement, 28 a vertical reinforcement, and 30 a horizontal reinforcement.

The precast wall slabs 10 having the above structure are erected continuously in the vertical direction by tightly connecting both ends of the chord members 12 to the attachment portions 34 provided for each floor of the steel column 32, and the precast wall slabs on the upper floors are installed. Ten gusset plates 16 are placed on the upper surface of the chord members 12a of the precast wall slab 10a on the lower floor, and the upper edges of the gusset plates 16 are welded and joined to the upper surface of the chord members 12a.
The upper end surface of the built precast wall slab 10 on the upper floor is the precast wall slab 10 on the lower floor that is opposite to this.
The height of the stud bolt 14a is set so as not to come into contact with the head of the stud bolt 14a protruding from the upper end surface of the chord member 12a of the string member 12a, and an appropriate gap is maintained.

Next, precast wall plates 10 and 10 on the upper and lower floors
A precast floor slab 36, which also serves as a floor formwork, is installed in the opposing part of a, and as shown in FIG. Continuing with the pre-cast floor slab 36, cast-in-place concrete is poured into the floor slab 4.
Create 0. This cast-in-place concrete is cast so that the lower end of the precast wall slab 10 is buried above the bottom of the recess 20, and the concrete is poured into the gaps between the contact parts and into the recess 20.
Make sure to spread it even within 0.

Thus, at the same time that the precast wall slab 10 and the floor slab 40 are connected, the precast wall slab 1 on the upper floor
0 and the upper end surface of the precast wall slab 10a on the lower floor are combined and integrated.

In addition, formwork (not shown) is also installed between the precast wall slab 10 and the steel columns 32 on both the left and right sides,
As shown in FIG. 2, reinforcing bars 42 are arranged, and cast-in-place concrete is poured into the formwork to construct a steel reinforced concrete column 44. As shown in FIG. 5, this cast-in-place concrete is poured so that it is buried inside the bottom of the recesses 22 on both the left and right sides of the precast wall slab 10, and both sides of the precast wall slab 10 are covered with steel frames. It is embedded in a reinforced concrete column 44 and integrated.

The shear wall of the present invention is completed by repeating the above procedure and continuously erecting precast wall slabs from the lower floor to the upper floor.

As described above, in the shear wall of the present invention, the chord members of the precast wall slab on the upper floor and the chord members of the precast wall slab on the lower floor that are opposite to the chord members of the precast wall slab on the upper floor are connected to They are joined together via set plates to form an assembled steel beam with the chords of the precast wall slabs on the upper and lower floors as the upper and lower chord members, respectively, and the lower end of the precast wall slabs on the upper floor and the lower end of the precast wall slabs on the lower floor. The upper ends of the precast wall slabs will be buried with cast-in-place concrete to form a steel-framed concrete beam, which will connect the vertically continuous precast wall slabs extremely firmly. .

In the above example, stud bolts are provided protruding from the upper surface of the chord members of the precast wall slabs, a recess is formed on the lower end surface, floor reinforcement is placed between the gaps between the opposing precast wall slabs, and cast-in-place concrete is poured. However, it is not necessary to do so, and it is also possible to omit some or all of these structural members and place cast-in-place concrete. Furthermore, the recesses on both the left and right sides of the precast wall slab can also be omitted.

As is clear from the above explanation, the present invention incorporates chord members, gusset plates, and lattice bars, which are the constituent members of an assembled steel beam, in a precast wall slab, and builds the precast wall slab continuously in the vertical direction. The precast wall slabs on the upper floor and the opposing precast wall slabs on the lower floor are connected by gusset plates to form an assembled steel beam with high rigidity, and the precast wall slabs on the upper and lower floors are connected by The sections are integrally buried with cast-in-place concrete to form a steel-framed concrete beam. Therefore, according to the present invention, it is possible to construct a wall body with high toughness that is firmly integrated in the vertical direction, and the ability to follow bending deformation is further improved. Even when force is applied, it can fully perform its function as a seismic wall.

Furthermore, according to this invention, since the precast wall slab of the floor is embedded in the concrete at the same time as the concrete of the floor slab is poured, the connection between the wall and the floor slab is completed at the same time, and the process is completed. It is possible to save money and shorten the construction period, and it also has the effect of being able to efficiently construct prefabricated buildings with excellent earthquake resistance in a short period of time.

[Brief explanation of drawings]

Fig. 1 is a partial front view showing an example of the joint state of precast wall slabs, floor slabs and steel columns by the construction method of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a vertical cross section thereof. Figure 4 is an enlarged front view showing the contact parts of the precast wall slabs on the upper and lower floors, and Figure 5 is
FIG. 2 is an enlarged front view showing a joint between a precast wall slab and a steel column. In the figure, 10 and 10a are precast wall plates, 1
2, 12a are string members, 16 is a gusset plate, 1
8 is a lattice bar, and 36 is a floor formwork.

Claims (1)

[Claims] 1. The chord members of the steel beam are built in on the same plane along the length direction of the upper end face with their upper faces exposed, and the gusset plate is built in the lower end face with its lower edge protruding, and the chord members A precast wall slab formed integrally with a lattice bar attached between the upper floor precast wall slab and the gusset plate is installed continuously in the vertical direction, and the lower edge of the gusset plate of the upper floor precast wall slab is connected to the After joining the upper surface of the chord members of the precast wall slabs on the floor to form an assembled steel beam, and installing the floor formwork at the opposing parts of the precast wall slabs on the upper and lower floors,
A method for constructing a shear wall for a prefabricated building, characterized in that the lower end of the precast wall slab on the upper floor and the upper end of the precast wall slab on the lower floor are buried and integrated with cast-in-place concrete.