KR920002117B1 - Construction of precast reinforced concrete structure - Google Patents

Abstract

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Description

Construction method of precast reinforced concrete structure

1 to 8 illustrate a process of one embodiment of a method for constructing a precast reinforced concrete structure according to the present invention.

1 is a front view showing a construction method of a precast concrete pillar member.

2 is a front view showing a state in which a precast concrete beam member in one direction is installed on the pillar member.

3 is a longitudinal sectional view showing a joint of the pillar and the beam member.

4 is a view showing a state in which a precast concrete beam member in a different direction is installed on the pillar member.

5 and 6 are longitudinal cross-sectional views and plan views, respectively, showing the joints of the beam members in two directions.

FIG. 7 is a longitudinal sectional view showing a state in which subsequent concrete is poured on the joint and the beam member. FIG.

8 is a longitudinal cross-sectional view showing the joint between the beam member and the slab.

FIG. 9 is an explanatory diagram showing the relationship between the bottom cast bars of the beam members in the two directions. FIG.

10 and 11 are perspective and front views of the precast concrete pillar member, respectively.

12 is a perspective view of a precast concrete beam member.

* Explanation of symbols for main parts of the drawings

A: precast concrete column member B, B ': precast concrete beam member

C: precast concrete deck 2: column cast iron

3: rib reinforcing bar 4: beam bottom cast iron

4a: hook portion 6: transverse rebar

7: strip () reinforcing bars 8: beam upper cast bar

9: concrete

The present invention relates to a method of constructing a precast reinforced concrete structure.

Conventionally, for the industrialization method of the frame structure of reinforced concrete structure, the method of ancestor reinforcement of steel reinforcement, the method of using the semi-finished member of the part of beam or slab using the precast wreath frame, etc. have.

However, there are few methods for precasting all members such as columns, beams, slabs, etc. Also, the methods for precasting all members have difficulty in joining members, and it is difficult to secure structural performance equivalent to that of a concrete-integrated structure. It was difficult.

The present invention has been proposed to solve the above problems and is precast from the floor to the beam, and the column head of the precast concrete pillar member protruding the column cast iron by the length of the reinforcing bar reinforcement to the beam forming portion in the column head Between the sections, the slab thickness part of the cross section breaks down (falls out), the rib reinforcing bar protrudes on the upper part, the protruding end of the lower main reinforcing bar is bent at the required angle on the horizontal plane, and the outer end is directed upward. Precast concrete beam members bent in a shape of a hook are installed in one direction, and the hook shapes of the lower main reinforcing bars are positioned beyond the column center line, and between the hook shapes of the lower main reinforcing bars intersecting with each other of the corresponding beam members. A horizontal reinforcing bar is installed, and then the beam member The beam member is constructed in one shape, and the lower main reinforcing bar is constructed with a precast concrete beam member positioned upward from the lower main reinforcing bar of the beam member in a direction perpendicular to the beam member in one direction between the column heads and simultaneously opposed to each other. After installing the horizontal reinforcing bars between the hook-shaped portions of the lower main reinforcing bars intersected with each other, the column strip reinforcing bars and the beam upper main reinforcing bars at the column beam joints were then placed, and then the precast bottom plate was installed on the beam members. It relates to a method of building a precast reinforced concrete structure, characterized in that the pillar member, the beam member and the bottom plate are integrated by hitting concrete on the beam joint and the beam member.

The present invention is precast from the floor to the beam as described above, the precast concrete column member and the slab thickness portion of the cross section protrudes to the length of the reinforcing bar reinforcement to the length of the reinforcement to the beam forming portion from the column head The ribs protrude from the upper part, and the protruding end of the lower main reinforcing bar is bent by the required angle on the horizontal plane, and the outer end is the same as the precast beam member and the beam member in one direction bent in a hook shape upward. The lower main reinforcing bar is formed using a precast concrete beam member in the other direction disposed above the lower main reinforcing bar of the beam member, and extends in one direction between the column heads of the column member. Hook of the lower cast iron at the same time to install precast concrete beam member Position the upper part beyond the center line of the column, and in this way, by installing transverse bars between the hook-shaped portions intersecting each other of the beam members to be constrained, the lower main reinforcing bars of the beam members that are opposed to each other to improve the fixing performance, Subsequently, a beam member in the other direction is interposed between the pillar heads of the pillar member in a direction orthogonal to the beam member in the one direction, so that transverse reinforcing bars are formed between the hook-shaped portions that cross each other. Excretion improves the fixing performance.

At this time, since the lower main reinforcing bars of the beam members in the two directions are disposed in engagement with each other in the vertical direction, it is not disturbed by the protrusion of the lower main reinforcing bars of the one direction beam members installed when installing the beam members in the other direction.

In the present invention, the column and reinforcing bars in the column beam joints and the beam upper main reinforcing bars are then disposed and precast bottom plates are installed on the respective beam members, and concrete is applied to the column beam joints and beam members. The member and the bottom plate are integrally coupled via the concrete.

As described above, according to the present invention, the pillar, beam, and bottom plate are composed of precast members, and do not need a mold and a support element, and can significantly shorten the construction period, and since the members are manufactured at the factory, a high quality member can be provided. Since each of the above members is integrated through the concrete of the concrete portion of the concrete later, the precast reinforced concrete structure having a performance more than the concrete integral placing structure is concentrically.

EXAMPLE

Hereinafter, the present invention will be described according to an embodiment. (A) is a precast concrete pillar member, which is precast from the floor to the bottom of the beam, and the pillar leg includes a pillar mortar-filled sleeve (1) embedded therein and connected to the upper portion of the sleeve (1). 2) It protrudes from the head of the column by the length to add the reinforcing bar length to the beam forming portion (see FIGS. 10 and 11). (B) is a precast concrete beam member (hereinafter referred to as beam (B)), the slab thickness of the cross-section is missing, the longitudinal dimension of the column is precast into the longitudinal direction, the ribs from the top (3 A part of) is protruded and installed, the two ends of the lower main reinforcing bar (4) protrude from the cross section of the beam, and each of the protruding ends is bent by the required angle (e.g. denoted as α in FIG. 6) with respect to the horizontal plane of the beam. In addition, the hook portion 4a whose outer end portion of the protruding end extends upward is bent (see FIGS. 6 and 12).

And on the lower layer slab (S), the mortar (5) is laid with a thickness of 20-30 mm in the part which the pillar cast iron (2) protrudes by the length necessary for a joint, and the said pillar member (A) is installed on it, The protruding pillar cast iron (2) is inserted into the sleeve (1) in the pillar member (A), and non-shrink mortar is injected into the sleeve (1), so that the pillar cast iron (2) and the pillar cast iron in the pillar member (A) ( 2) is bonded together and the pillar member A is provided as many as needed (refer FIG. 1).

Subsequently, the beams B are hypothesized across the beams B in the X direction between the column heads of the column members A, and the hook portions 4a of the lower main reinforcing bars 4 of the beams B are installed at positions beyond the column center line. (See FIG. 2), a horizontal rebar 6 is provided between the hook portions 4a and 4a of the opposite beams B intersecting with each other, and the relative beams B are interposed through the horizontal rebars 6. Restrain the lower main reinforcing bars (4) from each other (see Figure 3).

Next, a precast concrete beam member B '(hereinafter referred to as beam B') is hypothesized between the pillar members A over the Y direction perpendicular to the X direction. The beam B 'is configured in the same manner as the beam B in the X direction, but the lower main reinforcing bar 4' is disposed upward by the diameter of the reinforcing bar than the lower main reinforcing bar 4 in the beam B. Further, the hook portions 4'a (4'a) are disposed so as not to contact the protruding portion of the lower main reinforcing bar 4 of the beam B, and intersect with each other of the beam B 'opposed to the pillar member A. The transverse rebar 6 is provided between the two bars to rest the lower main reinforcing bars 4 'of the corresponding beam B' (see FIGS. 4 and 6).

Thus, in the present invention, the beams B and B 'in the X and Y directions can be easily identified by the eye, and the relative beams B, B and B' and B 'can be identified. Lower main reinforcing bars (4) (4), (4 ') and (4') intersecting with each other are provided with hooks (4a) (4a) and (4'a) (4'a) by installing transverse bars (6). The lower main reinforcing bars (4) (4), (4 ') (4') is characterized in that the restraint.

Thus, after installing the beams (B) and (B ') in both X and Y directions, the precast concrete bottom plate (C) or the precast concrete bottom plate combined with the formwork is placed on the beam upper cast iron (8), Concrete 9 is applied to the column beam intersections and the upper ends of the beams (see FIGS. 7 and 8), and then the pillar members A 'of the upper hierarchy are installed as shown in FIG.

Hereinafter, the precast reinforced concrete structure is constructed by repeating the above process.

Thus, according to the method of the above embodiment, the pillars, beams, and the bottom plate are composed of precast concrete members, eliminating the need for molds and supporting elements, greatly simplifying the construction, and shortening the construction period, and at the same time by the concrete Each member can be integrated, and a precast reinforced concrete structure having structural performance equivalent to or greater than that of the integrally placed concrete method can be constructed.

Claims (1)

The slab thickness of the cross section is broken between the column head of the precast concrete column member where the column cast bar protrudes by the length of the column head from the floor to the beam beam, plus the reinforcing bar length from the column head. The precast concrete beam members are laid down in one direction while the ribs protrude from the upper part, and the protruding end of the lower main rebar is bent by the required angle on the horizontal plane and the outer end is bent in a hook shape upward. The hook-shaped part of the main reinforcing bar is positioned beyond the pillar center line, and a horizontal reinforcing bar is provided between the hook-shaped parts of the lower main reinforcing bar that intersect each other of the beam members to be opposed to each other. The main reinforcing bar is lower than the lower main reinforcing bar of the beam member. Install the precast concrete beam member located on the side between the column heads at right angles to the beam member in one direction, and install the horizontal reinforcing bars between the hook-shaped members of the lower main reinforcing bars of the corresponding beam members. After reinforcing the column strip reinforcing bar and the beam upper main reinforcing bar in the column beam joint, and then installing the precast floor plate on the beam member, the pillar member and the beam member and the bottom plate are struck by concrete on the column beam joint and the beam member. Method of building a precast reinforced concrete structure, characterized in that to integrate.

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