JPH04140366A - Preceding erection method of prefabricated column bar and semi-pc girder in pc construction - Google Patents

Abstract

PURPOSE:To reduce progress of work by fixing joint hardware to floor positions of prefabricated column bars, and joining perpendicular joint plates projected to both ends of a semi-PC girder with joint plates of each joint hardware. CONSTITUTION:Joint plates 2a - 2d are projected in the horizontal and orthogonal direction in the shape of a cross, coupling members 3 are provided between adjacent joint plates, and transverse bars 4 are fixed to the upper and lower ends of the joint plates 2a - 2d to form joint hardware 2. After that, in floor positions of prefabricated column bars 1, the upper and lower transverse bars 4 of the hardware 2 are respectively fixed to each of the column bars 1 of the surroundings with fastening metal fixtures 5. Then, joint plates 7 projected to both ends of a semi-PC girder 6 are jointed with the joint plates 2a - 2d of the hardware 2. In addition, beams, deck plates and semi-PC floor boards are provided and, at the same time, after the required reinforcing steel is placed, a form 8 is placed to the circumferences of the column bars 1 to place concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a pre-construction method for prefabricated reinforcing bars and semi-PC girders in RC construction.

``Conventional technology'' Conventional RC construction consists of (1) a construction method in which reinforcing bars and formwork are assembled one level at a time according to the original values, and concrete is poured; (2) -R
A method in which concrete is poured by combining precast members and prefabricated reinforcing bars for each layer; (3) A method in which prefabricated column and beam reinforcements are used to assemble several floors of reinforcing bars before concrete is poured. etc. are known.

``Problems that the invention is not intended to solve'' The construction method described in (1) above requires a large number of workers on site, and in the current situation where it is difficult to secure workers, there is a problem that delays in the construction period are unavoidable. Method (2) requires fewer workers, but there is a problem in that the number of parts is large because lifting equipment is required at all times and is allocated for each floor. teeth.

Lifting equipment only needs to be used when erecting reinforcing bars, but forming and framing requires a lot of on-site work.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention provides joint hardware in which vertical joint plates are protruded in a cross shape in a horizontal orthogonal direction at each level of the prefabricated column reinforcement. This paper proposes an advance construction method for prefabricated reinforcing bars and semi-PC girders in RC construction, in which vertical joint plates protruding from both ends of the semi-PC girders are fixed and joined to the joint plates of each joint hardware.

``Operation'' Prefabricated column reinforcements and precast girders or /JX beams can be erected simultaneously for multiple floors, making it possible to shorten the process.

By installing deck plates and semi-PC floorboards at the same time as construction, it is easy to secure work scaffolding and improve safety.

It incorporates factory-fabricated prefabricated columns, precast girders or small beams, and lightweight cross-shaped joint hardware, so it can be constructed with a minimum number of workers and lifting equipment.

"Embodiments" Below, embodiments of the present invention shown in the drawings will be described.
Prefabricated column reinforcements 1 for multiple floors are erected, and joint metal fittings 2 made of cross-shaped steel plates are installed at each floor position.

The joint hardware 2 is made up of vertical joint plates 28 to 2d protruding in a cross shape in the horizontal orthogonal direction, and reinforced by a cane-shaped connecting member 3 between adjacent joint plates. Kantashi muscle 4 is horizontally fixed to the upper and lower ends.

Then, at each hierarchical position of the prefabricated columnar reinforcement 1, the upper and lower Kanzashi reinforcements 4 are leveled and fixed to each of the four circumferential columnar reinforcements 1 using fastening fittings 5 or the like.

In addition, the Kanzashi reinforcement 4 may be fitted into notched grooves provided at the upper and lower ends of the joint plates 28 to 2d and fixed by welding, or in some cases, may be fitted to the column Bl without welding. Fasten and fix.

Vertical joints protruding from both ends of semi-precast semi-PC girders 6 formed by molding concrete between the ends are attached to each of the joint plates 2a to 2d of the joint hardware 2 of each floor fixed in this way. The plates 7 are joined by bolting or the like.

Next, after attaching small beams, deck plates, semi-PC floor plates, etc. in the same way, the required reinforcing bars are arranged at each column-beam joint and the top of the beam, and formwork 8 is placed around each and around the column reinforcement 1. The columns and beams are then integrated by pouring cast-in-place concrete.

Effects of the Invention J As described above, according to the present invention, prefabricated column reinforcements and precast large beams or small beams can be erected for multiple floors at the same time with simple work, and the process can be shortened (in particular, it is possible to (Effective when the site is narrow where a type lifting machine cannot be installed).

By installing deck plates and semi-PC floorboards at the same time as construction, it is easy to secure work scaffolding and improve safety.

It incorporates factory-fabricated prefabricated columns, precast girders or small beams, and lightweight cross-shaped joint hardware, so it can be constructed with a minimum number of workers and lifting equipment.

4,

[Brief explanation of the drawing]

FIG. 1 is a front view showing the construction state according to the present invention, FIG. 2 is a plan view showing the construction state of the column-beam joint according to the present invention,
FIG. 3 is a longitudinal sectional front view of the same. 1. Prefabricated column reinforcement, 2. Joint hardware, 28~2d...
Joint plate, 3... Connecting material, Kanzashi reinforcement, fastening fittings, semi-PC girder, joint plate, formwork. Figure jI211gJ Figure

Claims (1)

[Claims] 1) Fix the joint hardware, which is a vertical joint plate protruding cross-shaped in the horizontal orthogonal direction, at each level of the prefabricated column reinforcement, and
An advance construction method for prefabricated reinforcing bars and semi-PC girders in RC construction, characterized in that vertical joint plates protruding from both ends of the girder are joined to the joint plates of the respective joint hardware.