JPH0586643A - Part and technique for jointing precast pc reinforced concrete structure - Google Patents

Abstract

PURPOSE:To simplify work processes in a construction site while making accuracy ensured for the construction by a method wherein concrete placement or grouting is made after joining reinforcing bars for beams or columns with sleeves for joining the reinforcing bars. CONSTITUTION:Steels for prestressed concrete 4, 4 are arranged only on the center bottoms of beams 2, 2 as resistances against stress due to long time loading, and joints 3, 3 for the beams are provided in positions wherefrom peaks of stresses are averted. After the beams 2, 2 are temporarily installed by means of gusset plates 7, 7 for temporary work, the beams 2, 2 are joined with one another with specified joining sleeves 8, 8 and after that, concrete is cast thereto. Main reinforcements 9, 9 of one of column members 1, 1 are then joined with bar joining sleeves embedded beforehand in the other column member 1, and by applying grouting to gaps in the joint, the column members 1 are joined together. Then a joint made up by combination of PC column members 1 in laid-down T shape and PC beams 2 in bar-like shape is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method in which a prestress is introduced into a precast structure and a joint portion among the construction methods.

[0002]

2. Description of the Related Art In the conventional precast PC reinforced concrete construction, all the joints are joined in the panel zone. That means that they were joined at the places where the most stress was applied. Further, the joining method is complicated, for example, the main bars of the pillar and the beam are joined together to join them. Further, when a large span is constructed with an RC structure, it is very costly, such as with an SRC structure, and the beam beam must be large. In terms of construction, the construction method of assembling reinforcing bars and formwork at the site greatly affected the labor, time, and weather.

[0003]

[Problems to be solved by the invention] The problems to be solved are the simplification of the construction method at the site construction and the labor saving of form carpenters, reinforcing bars, etc.
Higher concrete quality, more secure construction accuracy, lower construction cost and improved seismic resistance, larger span of reinforced concrete structure, and lower cost of prestressed structure.

[0004]

[Means for Solving the Problems] As shown in FIG. 1, a column member (1) of ├ type precast PC reinforced concrete structure with a beam protruding from the column and a beam member (2) of − type precast PC reinforced concrete structure are combined, Also, beam members (2)
A prestress was introduced into the PC steel material and the like at the center lower end.

As a beam joint method as shown in FIG. 3, beam members are temporarily installed with a gusset plate (7) for temporary installation of beam members, and then the main reinforcing bars of the beams are connected to each other by a sleeve for a reinforcing bar joint (cold crimping). , Grout injection method, etc.) (8), and concrete is placed in the beam joint section (3).

As shown in FIG. 4, a sleeve for a reinforcing bar joint (cold pressure bonding, grout injection method, etc.) (8) is embedded in advance in the lower edge of the upper column, and the main reinforcing bar is projected from the upper edge of the lower column. Joint with the old one, adjust the shaking with a bun mortar etc. at the center of the small edge, inject grout into the joint gap, and join the columns.

As shown in FIG. 5, the concrete above the beam member (2) made of precast PC reinforced concrete is left uncast, and the PC floor panel (10) is attached to the girder.
A rigid floor is constructed by laying it over one large beam, arranging the floor on the PC floor panel, and placing concrete on the upper part of the large beam and the slab part by the required thickness.

[0008]

[Example] A column member (1) of ├ type precast PC reinforced concrete with a beam protruding from the column as shown in FIG.
-Type precast PC Reinforced concrete beam member (2) is combined, and the beam member (2) has P at the center lower end.
Prestress was introduced into C steel and the like.

As shown in FIG. 3, as a beam joint method, beam members are temporarily installed by means of a temporary gusset plate (7) for the beam material, and then the main reinforcing bars of the beams are connected to each other by a sleeve for a reinforcing bar joint (cold crimping). , Grout injection method, etc.) (8), and concrete is placed in the beam joint section (3).

As shown in FIG. 4, a sleeve for a reinforcing bar joint (cold pressure bonding, grout injection method, etc.) (8) is embedded in advance in the lower edge of the upper column, and the main reinforcing bar is projected from the upper edge of the lower column. Joint with the old one, adjust the shaking with a bun mortar etc. at the center of the small edge, inject grout into the joint gap and join the columns

As shown in FIG. 5, the concrete above the beam member (2) made of precast PC reinforced concrete is left uncast, and the PC floor panel (10) is attached to the girder.
A rigid floor is constructed by laying it over one large beam, arranging the floor on the PC floor panel, and placing concrete on the upper part of the large beam and the slab part by the required thickness.

[0012]

As described above, according to the present invention, after the factory-produced pillar and beam members are carried into the site, the erection accuracy is obtained by the predetermined method for each of the pillars and the beams, and the reinforcing bars are connected by the predetermined method. It can be assembled in a short time by connecting with. Next, concrete having a strength equal to or higher than that of the members is placed in the beam joint portion. The above completes the precast PC reinforced concrete frame frame. This means that the work of form carpenter, reinforcing bar work, etc. is saved on site compared to the conventional method of placing concrete at the site and the conventional precast PRC method. In addition, temporary materials such as formwork supports can be omitted, resulting in significant labor saving as a whole, shortening the construction period, improving the quality of concrete, and ensuring the erection accuracy are far superior to the conventional technology. ..
In addition, the joints are joined at the parts avoiding the peak of stress for both columns and beams, and the prestress is introduced into the PC steel material only at the central lower end where the flexure and cracks are large.
And it has high strength. Moreover, it is far more economical than inserting a steel frame into SRC. In addition, in recent years, with the tendency of increasing the height of reinforced concrete, the development of high-strength concrete and high-strength reinforcing bars is urgently required. It can be called a construction method. Therefore, the present invention can be applied to high-rise housing as an enhancement of social capital, and construction of high-rise office buildings requiring a wide flat surface.

[Brief description of drawings]

The attached drawings are examples of the embodiment of the method of the present invention. FIG. 1 is a frame diagram showing the construction method of the present invention. FIG. 2 shows A of FIG.
Sectional drawing of the beam which expanded the part. FIG. 3 is a cross-sectional view of a beam joint portion. FIG. 4 is an enlarged view of the column joint of part B in FIG. 1. Figure 5
Is an assembly diagram of a rigid floor slab and a beam.

[Explanation of symbols]

 (1) Column member made of precast PC reinforced concrete (2) Beam member made of precast PC reinforced concrete (3) Beam joint part (4) PC steel material (5) Conventional construction method part (6) PC fixing bracket (7) Temporary gusset Plate (8) Reinforcing bar main joint sleeve (cold crimping, grout injection method, etc.) (9) Reinforcing bar main bar (10) PC floor panel (11) Floor slab concrete (post hitting part) (12) Floor slab rebar

Claims (4)

[Claims] 1. A pillar member (1) of ├ type precast PC reinforced concrete structure in which a beam is projected from the pillar as shown in FIG.
And-type precast PC beam members (2) made of reinforced concrete are combined, and P is attached to the center lower end of the beam members (2).
Pre-stressed PC reinforced concrete joints and construction method in which pre-stress is introduced to C steel, etc. 2. As a beam joint method as shown in FIG. 3, the beam members are temporarily installed by means of a gusset plate (7) for temporary installation of beam members, and then the main reinforcing bars of the beams are connected to each other by a sleeve for a reinforcing bar joint (cooling). Pre-cast PC reinforced concrete joints that are joined by inter-pressure bonding, grout injection method, etc. (8) and concrete is placed on the beam joints (3) 3. As shown in FIG. 4, a reinforcing bar joint sleeve (cold pressure bonding, grout injection method, etc.) (8) is embedded in advance in the lower edge of the upper column, and the reinforcing bar main bar is projected from the upper edge of the lower column. Pre-cast PC reinforced concrete joint that joins with the one that you set up, adjusts the shake with a bun mortar etc. in the center of the forehead, injects grout into the joint gap, and joins the columns 4. As shown in FIG. 5, the concrete above the beam member (2) made of precast PC reinforced concrete is left uncast, and the PC floor panel (10) is bridged between the girders and the one girder to make the PC floor. Floor reinforcement is done on the panel, concrete is placed on the upper part of the girder and slab by the required thickness, and the joint part of precast PC reinforced concrete structure that forms the rigid floor