KR20130038089A - Precast concrete frame for buildings using precast concrete beam continued by post tensioning - Google Patents

Abstract

The present invention relates to a building frame consisting of precast concrete columns and beams, according to a preferred embodiment of the present invention, the body having a cylindrical cross-sectional shape with a hollow formed therein, and the head of the body integrally on the top of the body A precast concrete beam formed on the precast concrete column and precast concrete beams mounted on both sides of the head of the precast concrete column, and precast concrete beams mounted on the precast concrete columns are continuous by post-tensioning. A cast concrete framework is provided.

Description

Precast concrete frame for buildings using precast concrete beam continued by post tensioning}

The present invention relates to a building frame consisting of precast concrete columns and beams, and more particularly, a precast concrete column having a cylindrical cross-sectional shape with a hollow formed therein and having an ovule integrated at the top and a precast mounted on the column. Precast concrete beams are constructed of concrete beams and are continuous by post-tensioning.

Concrete is classified into cast-in-place concrete and precast concrete according to the time of pouring. Precast concrete refers to concrete that is poured into molds produced in various forms at the factory. The cast precast concrete member is transported to the site by the transport vehicle after curing and assembled in the final position.

Precast concrete is called PC, and the method of building structures using PC is called PC method. Unlike the site casting method, which installs formwork at the construction site, reinforces steel, and places concrete to complete the building, the PC method is an all-weather facility in which structural members such as columns, beams, slabs, and walls are not affected by weather or season. It is a construction method that is manufactured under strict quality control in a factory equipped with a steel pipe and then transported and assembled to a site to complete a building. Therefore, it is a representative industrialization method that maximizes the use of equipment and machines throughout the entire process from production to assembly.

In Korea, the PC method is markedly developed by the government's 2 million housing construction plan and policy support for prefabricated houses.In the 2000s, the PC method was applied to stadiums, underground parking lots, large discount stores, factories, and warehouses. Is getting wider.

Taking the underground parking lot as an example, the construction process using the PC method shows that the columns, beams, and floor plates are manufactured at the factory and then transported to the site. At the site, the anchors are first installed and the columns are assembled. After mounting the beams and installing the bottom plate, the beam and the bottom plate is reinforced by reinforcement, and the concrete is poured into the pillar, the beam and the bottom plate are constructed. The pillars are mainly end-mounted to pillars having a rectangular cross-sectional shape and integrated with the pillars by overlay concrete.

It is generally designed to be a simple support seen from the general floor, and thus the cross section is designed based on the bending moment acting on the center of the beam, so that both ends are overdesigned and uneconomical. If the beams mounted on the column are continuous with each other, more efficient cross-sectional design can be achieved and the seismic performance of the joint can be improved. The most common reinforcement method to secure the continuity is a composite moment joining method in which the lower reinforcing bar is fixed in the column-beam connection in the form of hook and the upper reinforcing bar is available for on-site reinforcing. . However, this method also has the disadvantage that the member cross section is not efficient due to the beam end reinforcement for continuity of the beam.

As a background technology of the present invention, another beam-column joining method is Korean Unexamined Patent Publication No. 2010-0121864, `` Continuous binding structure of PC beams used in building structures by PPC composite method '' (Patent Document 1 ). In this prior art, a separate binding bar is inserted to connect the PC beams facing each other by forming fastening grooves and settling grooves at the ends of the PC beams disposed on both sides of the PC column, and at the ends of the binding bars protruding from the fastening grooves. A PC beam continuous binding structure for forming a fastening nut is shown.

Another prior art that is the background of the present invention is the Republic of Korea Patent Publication No. 2006-0102785 'Development of dry connections of precast concrete columns and beams by reinforcing bolted joint' (Patent Document 2). In this prior art, a precast concrete column is embedded with a reinforcing bar with a coupling so that the screw hole is exposed from one side at a certain height of the column; One end of the reinforcing bar consists of a precast concrete beam that is reinforced to protrude a barred rod, and includes a duct pipe fixed to a c-angle angle into which the bar of the barred bar can be inserted. It consists of a connection part formed by a reddened bar through hole, by fastening a reddened bar to the column screw hole through a through hole at one end of the beam and fixing it with a nut to directly connect the main reinforcing bars of the upper and lower beams of the precast concrete beam to the column without a transfer block. A dry connection of precast concrete columns and beams is shown, which is constructed so that the precast columns and beams are strongly joined.

In order to solve the disadvantages of the conventional synthetic moment bonding method and the prior art of the present invention has the following object.

Republic of Korea Patent Publication No. 2010-0121864, November 19, 2010. Republic of Korea Patent Publication No. 2006-0102785, 2006.09.28.

An object of the present invention is to provide a precast concrete frame for buildings with light weight and economical efficiency by reducing the quantity.

Another object of the present invention is to provide a precast concrete frame for buildings that can ensure the continuity of the beam in a simple way.

According to a preferred embodiment of the present invention, there is provided a body having a cylindrical cross-sectional shape with a hollow inside, a precast concrete column having an integrated headpiece integrally formed on an upper end of the body, and mounted on both sides above the head of the precast concrete column. A precast concrete frame is provided, characterized in that it is composed of precast concrete beams, and the two precast concrete beams mounted on the precast concrete columns are continuous by post-tensioning.

According to another suitable embodiment of the present invention, both ends of the precast concrete beam is formed with each of the main root receiving groove and the inner sheath pipe is embedded so that both ends are exposed, precast mounted on one side of the precast concrete pillar The length of the precast concrete beam is inserted by inserting the tension member into the sheath pipe installed inside the concrete beam, and then inserting the tension material into the sheath pipe installed inside the precast concrete beam mounted on the other side through the junction with the precast concrete column. The tension member is placed inside the sheath pipe to penetrate all the precast concrete beams located on the line extending in the direction, and the tension members are settled in each of the outermost precast concrete beams. Characterized by continuous beam A precast concrete framework is provided.

According to another suitable embodiment of the present invention, each of the pockets are formed at a position spaced in a predetermined distance from the end of the precast concrete beam, the anchorage is installed between the pocket and the end, and the sheath pipe is connected to the anchorage toward the outside, The precast concrete beam is mounted on the precast concrete column, and then through the pocket of the precast concrete beam mounted on one side of the precast concrete column, the tension member is inserted and past the column-to-beam connection to the other precast concrete beam pocket. By protruding and then tensioning and fixing using anchorages, a precast concrete framework is provided, characterized in that the precast concrete beams located on both sides of the precast concrete columns are continuous with each other.

According to another suitable embodiment of the present invention, the head is formed to form an opening in communication with the hollow of the body to be filled with concrete in the hollow inside the body, the surface surrounding the hollow of the body is treated by a rough surface There is provided a precast concrete framework for buildings using postcast method continuous precast concrete beams, characterized by increased adhesion to the concrete being filled.

According to the present invention, the pillar member is a hollow cylindrical cross-section with a hollow formed therein, which is not only lightweight but also economical due to the reduction of concrete quantity. It has the advantage of simple field work and simple structure to secure the continuity of the beam. In addition, there is an advantage in that the cross section of the beam can be efficiently designed by the beam is continuous over a multi-span by post-tensioning. In addition, since the beam is continuous by post-tensioning, the unity between the column and the beam joint is improved and the seismic performance is improved.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a view showing a precast concrete pillar according to the present invention (a) is a perspective view and (b) is a cross-sectional view taken along the line AA.
Figure 2 is a view showing a precast concrete beam according to the present invention (a) is a perspective view and (b) is a cross-sectional view taken along the line BB.
3 is a perspective view showing a precast concrete beam according to another embodiment of the present invention.
4 is a view showing a state in which the precast skeleton is constructed using the beam shown in FIG.
Figure 5a is a view showing a state in which the precast skeleton is constructed using the beam shown in FIG.
Figure 5b is a view showing another embodiment of the appearance of the precast skeleton using the beam shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

The precast concrete frame according to the present invention has a cylindrical cross-sectional shape with a hollow inside and is composed of a precast concrete column and a precast concrete beam mounted on the top of the precast concrete beam on the top and the precast concrete beam is in post-tensioning. By sequencing. In the following, the configuration of the columns and beams will be described in detail with reference to the drawings, and then, a frame structure composed of these columns and beams will be described.

1 is a view showing a precast concrete pillar according to the present invention (a) is a perspective view and (b) is a cross-sectional view taken along the line A-A.

As shown in FIG. 1, the precast concrete pillar 10 (hereinafter, also simply referred to as a “PC pillar”) according to the present invention has an outer circumference at the top of the body 11 having a cylindrical cross-sectional shape in which a hollow 11a is formed therein. 12) has a shape formed integrally. As the cross section is formed into a hollow cylindrical shape, the pillar member can be reduced in weight and the concrete volume can be reduced, thereby securing economical efficiency. PC pillar 10 is reinforced by rebar like a general PC pillar, in the longitudinal direction a plurality of the main bars 111 are arranged, and at a predetermined interval along the longitudinal direction to surround the main bars 111 with respect to the longitudinal direction In the orthogonal direction, a plurality of root roots 112 are placed. The main root 111 protrudes a predetermined length upward of the head 12 so that the pillars of the upper and lower layers may be integrally connected to each other. The head 12 needs to have a width on which the precast beam can be placed and the shape is not necessarily limited to the rectangular plate shape shown. The head 12 may be configured to form an opening 12a in communication with the hollow 11a of the body 11 so as to fill concrete in the hollow 11a inside the body 11, and the hollow 11a may be formed. The enclosing surface can be treated with a rough surface to increase adhesion to the filled concrete. In addition, the head 12 may be installed to protrude the reinforcing rods 113 for assembling the PC beam 20 to increase the safety by preventing the fall during the assembly of the PC beam 20.

Figure 2 is a view showing a precast concrete beam according to the present invention (a) is a perspective view and (b) is a cross-sectional view taken along the line B-B.

As shown in FIG. 2, the precast concrete beam 20 (hereinafter, simply referred to as a 'PC beam') according to the present invention has a rectangular cross-sectional shape, and at each end thereof, a main root 111 protruding over the head 12 is penetrated. The receiving groove 20a is formed. PC beam 20 is reinforced by reinforcing bars in the same way as a general PC beam, a plurality of the main bars 21 are arranged in the longitudinal direction, and in the longitudinal direction at regular intervals along the longitudinal direction to surround the main root 21 In the direction perpendicular to the plurality of roots 22 are placed. The ribs 22 are protruded to a predetermined length to the upper surface of the PC beam 20 to increase the adhesion with the overlay concrete. A sheath tube 23 is embedded in the PC beam 20, and both ends of the sheath tube 23 are exposed above the upper surface of the beam 20. The PC beam 20 according to the present embodiment has a sheath pipe through the PC beam 20 positioned on a line extending in the longitudinal direction of the beam after mounting the PC beam 20 on the PC pillar 10 as described later. (23) By placing the tension material inside and tension-fixing the tension material in the outermost PC beam 20, respectively, it is possible to simultaneously connect a plurality of PC beams 20 in one tension operation. In order to reduce the weight of the PC beam 20, a block out part 20b may be provided between the receiving grooves 20a and the root 20 of both sides.

3 is a perspective view showing a precast concrete beam according to another embodiment of the present invention.

The precast concrete beam 20 'according to the present embodiment has pockets 24 formed at positions spaced a predetermined distance from the ends to the inside, and a fixing unit 25 is installed between the pockets 24 and the ends. ), Sheath pipe 26 is provided toward the outside. The PC beam 20 ′ is reinforced with a plurality of main roots 21 and the roots 22 in the same manner as the above-described embodiment, and the roots 22 protrude a predetermined length onto the upper surface of the PC beam 20. As will be described later, the PC beam 20 ′ according to the present embodiment is mounted on the pillar 10 and then inserted into the tension member through the pocket 24, and then tensioned using the anchorage 25 to fix both sides of the PC pillar 10. The PC beams 20 'positioned at can be continuous with each other.

4 is a view showing a state in which the precast skeleton is constructed using the beam shown in FIG.

As shown in FIG. 4, the PC beams 20 are respectively placed on both sides of the head 12 of the PC pillar 10, and the tension member 30 is inserted into the sheath tube 23 installed inside the PC beams 20. Later, the tension member 30 is inserted into the sheath tube 23 installed inside the neighboring PC beam 20 past the junction with the PC column 10 on the line extending in the longitudinal direction of the PC beam 20. The tension member 30 is placed inside the sheath tube 23 so as to penetrate all the PC beams 20 positioned therein, and the tension members 30 are tension-fixed in the PC beams 20 located at the outermost side, so that the tension member 30 is in one tension operation. A plurality of PC beams 20 can be continuous at the same time.

As described above, the PC beams 20 on both sides mounted on the PC pillars 10 in the precast concrete framework according to the present embodiment are continuous by tensioning the tension member 30 continuously arranged beyond the joint portion of the pillars and the beams. Therefore, compared to the conventional composite moment joining method, it is easier to continuously connect neighboring beams at the joints of the columns and beams. There is an advantage that can be continued.

After mounting the precast concrete slab between the PC beams 20 and reinforcing the slab upper reinforcement and then poured the overcast concrete 40 is completed one layer of precast concrete frame. Thereafter, the upper PC pillar 50 is connected to the lower PC pillar 10 using the main root 111 exposed over the head 12, and the beam 20 is mounted as described above, and the beam 20 is continuous. The slab mounting and reinforcement concrete pouring (40) process is repeated to complete the framework.

FIG. 5A is a view showing a construction of precast skeleton using the beam shown in FIG. 3, and FIG. 5B is a view showing another embodiment of a construction d of precast skeleton using the beam shown in FIG.

In the present embodiment, unlike the embodiment described above, the PC beams 20 'positioned at both sides of the PC column 10 are not connected to all the PC beams 20 in a single tensioning operation. According to this embodiment, it is necessary to repeat the process of placing the tension member 30 in the PC beam 20 'mounted on both sides of the column after the column-beam connection to each column-beam connection and tension-fixing, but more firmly and firmly. It has the advantage that the precast concrete beam 20 'can be continued.

Specifically, the PC beam 20 'is mounted on the PC pillar 10, and then the tension member 30 is inserted through the pocket 24 of the PC beam 20' mounted on one side of the PC pillar 10, and the pillar and The PC beam 20 'located on both sides of the PC column 10 is formed by protruding into the pocket 24 of the PC beam 20' on the other side through the junction of the beam, and then tensioning and fixing with the fixing unit 25. Can be continuous with each other.

After mounting the precast concrete slab between the PC beam (20 ') and reinforce the slab upper reinforcement and then poured the overcast concrete 40 is completed one layer of precast concrete frame. Then, the upper PC pillar 50 is connected to the lower PC pillar 10 by using the main root 111 exposed over the head 12, and the PC beam 20 'is mounted as described above, and the PC beam ( 20 ') sequencing, slab mounting and reinforcement concrete pouring (40) process is repeated to complete the frame.

On the other hand, in the above described the case where the PC column 10 is a one-layer one-section system, as shown in Figure 5b can also be applied to the PC column 10 of the two-layer one-section system.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

10: PC pillar
11: Body
11a: hollow
12: outrigger
12a: opening
20, 20 ': PC BO
20a: receiving groove
23, 26: sheath tube
25: anchorage
30: tension
40: overlay concrete
50: upper layer PC pillar

Claims (4)

A body having a cylindrical cross-sectional shape in which a hollow is formed therein, a precast concrete column in which a head head is integrally formed at the top of the body,
It consists of precast concrete beams mounted on both sides of the head of the precast concrete column,
A precast concrete frame for buildings using continuous precast concrete beams, which are continuous by post-tensioning, characterized in that the precast concrete beams on both sides mounted on a precast concrete column are continuous by post-tensioning. The method according to claim 1,
Both ends of the precast concrete beam are each formed with a main receptacle groove, and the sheath tube is buried inside so that both ends thereof are exposed.
The tension member is inserted into the sheath tube installed inside the precast concrete beam mounted on one side of the precast concrete column, and then the tension material is placed in the sheath tube installed inside the precast concrete beam mounted on the other side after passing through the junction with the precast concrete column. By placing the tension member inside the sheath pipe to penetrate all the precast concrete beams located on the line extending in the longitudinal direction of the precast concrete beams, and tensioning the tension members in the outermost precast concrete beams Precast concrete frame for buildings using continuous precast concrete beams in a post-tension method, characterized in that a plurality of precast concrete beams are continuous at the same time in one tension operation. The method according to claim 1,
Precast concrete beams each have a pocket formed at a distance spaced inward from the end, and the anchorage is installed between the pocket and the end, the anchorage is connected to the sheath tube toward the outside,
The precast concrete beam is mounted on the precast concrete column, and then through the pocket of the precast concrete beam mounted on one side of the precast concrete column, the tension member is inserted and past the column-to-beam connection to the other precast concrete beam pocket. A precast concrete frame for buildings using continuous precast concrete beams in a post-tension method, characterized in that the precast concrete beams located on both sides of the precast concrete pillars are successive by extruding and then tensioning and fixing with a fixing device. The method according to claim 1,
The head is formed to form an opening in communication with the hollow of the body so that the concrete can be filled in the hollow inside the body, and the surface surrounding the hollow of the body is treated with a rough surface to increase the adhesion to the filled concrete Precast concrete frame for buildings using continuous precast concrete beams by post tension method.

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