JPH03132532A - Construction method of precast reinforced concrete column and beam - Google Patents

Abstract

PURPOSE:To facilitate the selection of joining strength and construction by coupling the lower main reinforcement exposed jumping upper reinforcements with reinforced auxiliary reinforcements after beams having U-shaped sections are constructed opposite to each other to column head sections and, at the same time, providing the required number of up and down continuous main reinforcements between beams opposed to each other. CONSTITUTION:Precast reinforced concrete beam members 10 in which beam lower main reinforcements 12 forming exposed jumping upper reinforcements 12a on the end and stirrups 13 having exposures 13a on the upper part are buried are provided to a concrete beam main body 11. After that, the ends of beams 10 are constructed opposite to each other to column heads 1a, and spiral reinforcements 17 as reinforced auxiliary reinforcements are fitted and loaded between jumping upper reinforcements 12a of each beam. Then, the required number of beam lower main reinforcements 15 and beam upper main reinforcements 16 are continuously arranged between beams 10 through the column heads 1a. In addition, after underfloor boards are laid and arranged, concrete is placed together with columns and beams as a unit. According to the constitution, the designing flexibility of beam joining strength is increased, a cost can be greatly reduced, and the accuracy can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for constructing precast reinforced concrete columns and beams in reinforced concrete (or steel frame) rigid frame buildings.

(Prior art) Conventionally, reinforced concrete (or steel frame) concrete rigid frame buildings are constructed by assembling reinforcing bars (main bars of columns, beams, etc., shear reinforcing bars, etc., or steel frames) at the construction site, and constructing assembled reinforcing bars (or steel frames). Assemble a formwork around the reinforcing steel and surround it.
It is common practice to pour concrete into the same formwork, dry it, solidify it, then dismantle the formwork and construct it, but it is also possible to assemble the reinforcing bars (or steel frames), assemble and dismantle the formwork at the work site. etc., is dangerous work and requires a lot of skill and labor and time, and construction accuracy cannot be ensured due to variations in assembly and layout, making it difficult to secure skilled workers and shorten the construction period. There is.

In view of the above-mentioned circumstances, a pre-assembly method has been developed in which assembled reinforcing bars (or steel frames) and assembled formwork that have been assembled in advance at a factory etc. are transported to the construction site and installed, and more recently,
Precast reinforced concrete beams (components) and hollow precast reinforced concrete column components manufactured in factories, etc. are delivered to the construction site, installed, and used as formwork, and the same components are used as structural materials for beams and columns (some of them). A method for constructing reinforced concrete columns and beams has been proposed to address the above-mentioned issues by reducing the need for formwork and improving construction accuracy.

In the conventional precast construction method, for example, a plurality of ribs are fixed to the inner surface of a main concrete beam with a U-shaped cross section, and a plurality of beam top and bottom main bars are fixed to the upper and lower parts of each rib. A precast type reinforced concrete column in which a precast reinforced concrete beam member is used, the end of the beam member is erected on the column head of a precast reinforced concrete column member, and concrete is poured into the column member and beam member.
Beam construction methods have been proposed (for example, Japanese Patent Application Laid-open No. 63-400
No. 29).

In addition, the end of a precast reinforced concrete beam with a solid concrete shape in which multiple lower beams, intermediate main reinforcements, and cost reinforcements are embedded is erected on the column head, and between the exposed jump parts that are exposed from the end of the beam and facing each other. A precast reinforced concrete column is constructed by fitting closed-loop reinforcement into the frame, arranging reinforcing bars around it, pouring steel fiber reinforced concrete into the column head, and constructing the column head and the area between the two prefectures as one unit. - Beam construction methods have been proposed (for example, Japanese Patent Publication No. 32299/1983).

(Problem to be Solved by the Invention) In the conventional precast type reinforced concrete column/beam construction method, the construction method using the precast reinforced concrete beam member with a U-shaped cross section is such that the lower main reinforcement of the cross-section beam is attached to the inner surface of the main concrete beam having a U-shaped cross section. There is a risk of deformation and destruction due to the load of poured concrete, etc., which requires reinforcement of the beam member itself. , which requires a lot of effort and time.

In addition, in the construction method using solid precast reinforced concrete beams, deformation of the beams is prevented, but there are also problems such as the fitting of closed-loop bars between the exposed jump parts, the arrangement of reinforcing bars around them, and the It is necessary to place fiber-reinforced concrete, and in particular, placing the concrete locally within the column head between the beams is a troublesome work, and there are problems in that it is likely to be one of the causes of a decrease in construction accuracy.

The present invention was developed to address the above-mentioned problems, and has a high degree of freedom in beam design, construction planning, etc., and can save labor, improve construction efficiency, reduce costs, improve quality, etc. To provide a method for constructing precast reinforced concrete columns and beams that enables

(Means for Solving the Problems) The present invention involves erecting the ends of a plurality of precast reinforced concrete beam members with a U-shaped cross section in which lower beam upper reinforcements and cost reinforcements are buried in the column head, and exposing the ends of each beam member. A reinforcing sub-reinforcement is provided between each exposed jump part of the upper reinforcement at the bottom of the beam that faces each other in front of the column center line, and the column head is installed in the groove and between the beams that are vertically installed in the center of the bottom inner surface of each opposing beam member. The feature is that reinforcement is placed through the lower part of the beam at the center of the beam, and the upper reinforcement of the beam is placed through the top of the cost reinforcement of each beam member and the column head between the beams, and each exposed jump reinforcement Basically, the strength of the column-beam joint is ensured by anchors (reinforcing sub-reinforcements) and through-reinforcement on the beam top and bottom main reinforcements, and the strength of the column-beam joint is basically ensured, as well as adjustment using the anchors and the beam bottom top reinforcement and beam top top reinforcement in the center. By selecting and setting the diameter, number, etc., it is easy and flexible to accommodate the required strength of the column-beam joint, eliminating the need for localized steel fiber reinforced concrete pouring and allowing continuous pouring of similar concrete. is made possible.

In addition, the anchor force can be increased by inserting spiral reinforcements and steel pipes between opposing exposed jump parts as reinforcement reinforcement, or by placing the exposed jump reinforcement of each beam lower main reinforcement beyond the center of the column. It enables adjustment, shortening of exposed jump bars, etc., making concrete placement easier and ensuring the desired connection and fixing force.

(Function) The ends of multiple U-shaped cross-sectional precast reinforced concrete beam members with embedded beam lower main reinforcement and cost reinforcement are erected on the column head,
The ends of each beam member are made to face each other at the column head, and the exposed jump reinforcements of the lower main reinforcement of each beam that are not exposed from the same end are made to face each other in front of the column center line, and reinforcing sub-reinforcements are placed between the exposed jump reinforcements. Along with giving
Reinforce the bottom main reinforcement of the central part of the beam in the groove vertically installed in the center of the bottom inner surface of each opposing beam member and through the column head between the beams. By placing reinforcement through multiple beam upper main reinforcements and selecting and setting the diameter, number, etc. of the upper and lower main reinforcements of the same beam, it corresponds to the required strength of the column-beam joint, and the same applies to column parts, column heads, and beam members. Concrete is poured continuously, and multiple beams or beams are continuously constructed and constructed together with the pillars.

The load-bearing strength of the beam member is increased by embedding the lower beam main reinforcement and cost reinforcement in a precast reinforced concrete beam member with a U-shaped cross section. The required strength of the column-beam joint is basically ensured by through-reinforcement arrangement and the through-reinforcement arrangement of multiple main reinforcements at the top of the beam, and furthermore, the required strength of the column-beam joint is ensured. Adjustment to increase the exposed length of the lower main reinforcement of each beam and shorten the exposed jump reinforcement by placing the upper reinforcement beyond the center of the column, and selection of the diameter, number, etc. of the lower main reinforcement of the beam and the upper main reinforcement of the beam in the center By setting, it is possible to easily and freely respond to the required strength of the column-beam joint, which differs depending on the hierarchy. Reinforcement can be easily and quickly performed.

In addition, it is no longer necessary to pour steel fiber reinforced concrete only inside the column head, and the same concrete can be poured continuously inside the beam member as well as the column head, making it easy and quick to perform one construction job, resulting in excellent construction accuracy. is obtained.

(Embodiment) A first embodiment of the present invention is shown in FIGS. 1 to 6, in which 1 is a column, 10 is a precast reinforced concrete beam member with a U-shaped cross section, and the column 1 is a construction site. A plurality of column main reinforcements 2, column tie reinforcements 3, and column side tie reinforcements 4 are assembled and reinforced as shown in the figure, and a plywood formwork 5 is placed around the assembled reinforcement members 6.
The concrete C is then placed in the assembled form to form a reinforced concrete column.

The precast reinforced concrete beam member 10 is manufactured in advance in a factory or the like, and has a U-shaped cross-sectional concrete beam main body 11,
Consisting of a plurality of beam lower main reinforcements 12 buried in the beam main body 11 and a plurality of buried cost reinforcements 13, each beam lower main reinforcement 12 protrudes from the end of the beam member 10 and is exposed, with the tip end facing upward. It has an exposed jumping muscle 12a that is bent to form a rib muscle 1.
3 has an exposed portion 13a on its upper part, and the beam main body 11
It has a structure in which a groove 14 is installed vertically in the center of the inner surface of the bottom, and a number of recesses 18 are further arranged in the inner surface.In the figure, 15 is the main reinforcement at the bottom of the beam, which is reinforced in the center, and 16 is each sub-reinforcement. 13 is the beam upper main reinforcement placed on the upper part, 17 is the exposed jumping reinforcement 12a,
Spiral reinforcement inserted between 12a and used as reinforcing sub-reinforcement, 30
This is a precast reinforced concrete plate with a large number of locking bars (Kaiser bars) 31 protruding from the upper surface.

The present invention is a method for reinforcing bars (or steel frames) in middle and high-rise buildings.
It is a precast reinforced concrete column/beam W4 construction method suitable for constructing a concrete rigid frame structure building, and the column part 1 is assembled with reinforcing bars 2 to 4 and formwork 5.6 as shown in the diagram.
The ends of a plurality of precast reinforced concrete beam members 10, in which a plurality of beam lower main reinforcements 12 and cost reinforcements 13 are buried at intervals, are erected on the column head 1a, and the ends are made to face each other at the column head 1a, and each exposed jump reinforcement 12a is constructed. are arranged in front of the center of the column so that they face each other, and a reinforcing sub-reinforcement, that is, a spiral reinforcement 17 is fitted between the opposing exposed jumping reinforcements 12a, 12a, and the center of the inner surface of the bottom of each beam member 10 is placed opposite to each other. Main reinforcement 1 at the bottom of the beam in the center of the column head 1a between the beams and in the groove 14 vertically installed in the section.
5, and a plurality of beam upper main reinforcements 16 are passed through the upper part of the cost reinforcement 13 of each beam member 10 and the column head 1a between the beams, and the upper and lower main reinforcements 12, 15, and 16 of the beams are reinforced. Required 0 Corresponding to the required strength of the column-beam joint, column part 1, column head 1
A and the beam member 10 are continuously poured with similar concrete 1-0, and by drying and fixing, the column and the beam are connected and constructed as one.

During the above construction, the floor is constructed and constructed on the top of the beam at the same time. That is, a floorboard 30 with locking bars 31 is disposed above the business body 11 of each beam member 10 as shown in the figure, and the first.
As shown in FIG.
The concrete C is placed inside the beam member 10, over the top of the beam, and then over the top surface of the subfloor board 30, and the exposed part 13a, connecting bars 32, main floor bars 33, etc. are buried in the top of the beam to connect the floor. Construction and construction of the parts as one.

A second embodiment of the present invention is shown in FIGS. 7 to 10, and in comparison with the first embodiment, a steel pipe is attached to the bent base between each exposed jumping reinforcement 12a, 12a together with the spiral reinforcement 17.
9 is fitted as a reinforcing sub-reinforcement, and the column tire hoop reinforcement 8 is arranged by fitting the corner of the main column reinforcement 2 in the middle, and the configuration of the pond is 1. Similarly, the strength of the column-beam joint is increased, making it suitable for beams on floors that require relatively large strength of the column-beam joint.

FIG. 11 shows a third embodiment of the present invention, which, compared to the first large embodiment, is characterized by a structure in which the exposed jump reinforcements 12a of each beam lower upper reinforcement 12 are arranged beyond the column center line. The rest of the structure is basically the same as the first embodiment, and the exposed length of the upper reinforcement at the bottom of the beam is increased to ensure anchoring force, and the exposed jump reinforcement can be shortened. This makes it easier to place the concrete, making it relatively suitable for beams on lower floors.

As the reinforcing sub-reinforcements, only the spiral reinforcement 17 and the steel pipe 1 are used.
9 or exposed jumping muscle 12a beyond the center of the column.
By applying this, the required strength of the column-beam joint can be achieved.

In addition, the reinforcing sub-reinforcements are arranged in a plurality of opposing wooden frames as shown in the figure, and arranged compactly around the center of the column.
It facilitates concrete placement and functions effectively.

The beam lower upper reinforcement 15 in the central part is easily placed in the groove 14 and automatically aligned with the buried reinforcement. The through reinforcement arrangement ensures excellent connection strength. Moreover, the same effect can be obtained with the beam upper main reinforcement 16 by similar selection, setting, and through-reinforcement arrangement. In addition, as shown in FIG. 5, a plurality of beam intermediate main reinforcements 34
Reinforcement will also be provided.

The precast reinforced concrete beam member 10 has a plurality of lower beam upper reinforcements 12 and cost reinforcements 13 embedded and strengthened to prevent deformation and destruction, and is anchored by exposed jump reinforcements 12a-12a (sub-reinforcement reinforcements), upper and lower parts of the beam. Through-through arrangement of main reinforcements 15 and 16 allows continuous pouring of similar concrete, greatly improving construction efficiency and accuracy. Furthermore, the beam member 10 is integrated with the poured concrete by a large number of recesses 18 provided on the inner surface thereof.

In the embodiments described above, it is possible to use precast reinforced concrete column members, or to partially use a steel frame.

(Effects of the Invention) As described above, the present invention embeds the beam lower upper reinforcement and cost reinforcement 3 in a precast reinforced concrete beam member with a U-shaped cross section to prevent deformation and destruction and facilitate construction. Exposure of reinforcement In addition to anchors between jump reinforcements and through-reinforcement of main reinforcements on the top and bottom of the beam, by freely adjusting them, the required strength of the column-beam joint can be accommodated and noted. 1 beam design - construction plan The degree of freedom is high, construction is easy and quick, labor-saving, construction efficiency is greatly improved, and excellent construction accuracy is achieved.

There is also the advantage of significant cost savings.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing the first embodiment of the present invention, and FIG.
Figure A is a cross-sectional view of the 17th column, Figure 2B is a front view of the beam member, Figure 3 is a side view of the column-beam joint, Figure 4 is the same plan view, and Figure 5 is the beam member. FIG. 6 is a side view of the exposed jump muscle, FIG. 7 is a perspective view of the entire structure showing the second embodiment, and FIG. 8 is a side view of the column-beam joint in FIG. FIG. 9 is a plan view, FIG. 10 is a side view of the exposed jumping muscle, and FIG. 11 is an overall perspective view showing the third embodiment. 1a: Column head 10: Reinforced concrete beam member 4 12. 15: Beam lower main reinforcement 12a/exposed jump reinforcement 3 Cost reinforcement 4 Groove 6 Beam upper main reinforcement 7 Spiral reinforcement 19: Steel pipe substitute, (

Claims (3)

[Claims] (1) The ends of a plurality of precast reinforced concrete beam members with a U-shaped cross section, in which the lower beam main reinforcement and reinforcing bars are buried, are erected on the column head, and the ends of each beam member are exposed from the end and are faced to each other on the near side of the column center line. A reinforcing sub-reinforcement is provided between each exposed jump reinforcement of the lower main reinforcement of the beam, and the lower main reinforcement of the beam at the center is installed in the column head between the beams and in the groove vertically installed in the center of the bottom inner surface of each of the opposing beam members. By placing reinforcement through the upper part of each beam member and through the column head between the beams, multiple beam upper main reinforcements are installed, and the upper and lower main reinforcements of the beam correspond to the required strength of the column-beam joint. A method for constructing a precast reinforced concrete column and beam, characterized by pouring concrete into the column head and the beam member. (2) In the precast reinforced concrete column/beam construction method according to claim 1, the precast reinforced concrete column/beam is characterized in that spiral reinforcements and steel pipes are fitted between the exposed jumping reinforcements to serve as secondary reinforcing reinforcements. Beam construction method. (3) In the precast reinforced concrete column/beam construction method according to claim 1, the exposed jump reinforcement of each beam lower main reinforcement is arranged beyond the center of the column, increasing the length of the exposed length of each beam lower main reinforcement at the column head. A precast reinforced concrete column and beam construction method that is characterized by: