KR101476411B1 - Precast concrete frame for buildings using precast concrete beam continued by post tensioning - Google Patents

Abstract

The present invention relates to a frame for a building comprising a precast concrete column and a beam. According to a preferred embodiment of the present invention, there is provided a frame for a building, comprising: a body having a cylindrical cross-sectional shape in which a hollow is formed; Wherein the precast concrete columns formed on both sides of the precast concrete column and the precast concrete beams mounted on both sides of the precast concrete column are continuous by post tensioning, A cast concrete frame is provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a precast concrete frame for buildings, and more particularly, to a precast concrete frame for buildings using post-tensioned continuous precast concrete beams,

The present invention relates to a framework for a building comprising a precast concrete column and a beam. More particularly, the present invention relates to a precast concrete column having a cylindrical sectional shape in which a hollow is formed therein, The present invention relates to a precast concrete frame constituted by a concrete beam and serialized by post tensioning of precast concrete.

Concretes are classified as on-site concrete and precast concrete depending on the time of casting. Precast concrete refers to concrete placed in molds manufactured in various forms at factories. The cured 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 construction method of building structure using PC is called PC method. Unlike on-site casting method in which concrete is laid by placing formwork on a construction site and reinforcing concrete is laid to complete the building, the PC method is used to construct structural members such as columns, beams, slabs, and walls, It is a method to manufacture under the strict quality control at the factory equipped with the equipment, and then to carry it to the site and assemble it to complete the building. Therefore, it is a typical industrialization method that maximizes the use of equipment and machinery throughout the entire process from production to assembly.

In the country, the PC construction method has shown remarkable development with the government's 2 million housing construction plan and the policy support for the prefabricated housing. In the 2000s, the PC construction method is applied to the stadium, underground parking lot, large discount store, factory, .

For example, in the underground parking lot, the PC construction method is used to construct the columns, beams and floor plates in the factory and then to the site. Then, on the site, the column anchors are installed first, After the beam is mounted, the bottom plate is installed, and the reinforcing bars and bottom reinforcing bars are laid out, and the concrete is put in place to integrate the columns and the beams and the bottom plate. The column has a rectangular cross-sectional shape, and the end is mounted on the column to be viewed and integrated with the column by the filled concrete.

It is generally designed to be simple support from the general bottom layer and thus has a disadvantage in that the cross section is designed on the basis of the bending moment acting on the center of the beam, so that it is excessively designed at both ends and is uneconomical. If the beams mounted on the columns are serialized to each other, a more efficient cross-sectional design is possible and seismic performance of the joints can be improved. The most common method for ensuring continuity is to use a composite moment connection method in which the reinforcement of beams is fixed in a column-to-beam connection with a hook shape and the upper reinforcement is capable of field reinforcement, . However, this method also has a disadvantage in that it is not efficient due to the large cross-section of the members due to the reinforcement reinforcement for continuous beam.

As another background technique of the present invention, another type of beam-column joining method is the continuous joining structure of PC beams used in architectural structures by the Korean Patent Publication No. 2010-0121864 (Patent Document 1 ). In this prior art, a fastening groove and an internal groove are formed at the ends of the PC beam disposed on both sides of the PC column, and a separate coupling steel rod is inserted to connect the opposite PC beams to each other. A continuous connection structure of a PC beam is proposed in which a coupling nut is coupled.

Another prior art which is the background of the present invention is disclosed in Korean Patent Publication No. 2006-0102785, 'Development of Dry Connections of Precast Concrete Columns and Beams by Reinforcing Bolted Joints' (Patent Document 2). In this prior art, a precast concrete column having a reinforcing bar embedded with a joint so that a screw hole is exposed at one side of the column at a predetermined height; And a duct pipe fixed to a U-shaped angle into which a standing leaf bar of the beam is inserted, the duct pipe being composed of a precast concrete beam arranged so that a laden bar protrudes from one end of a reinforcing bar, And a laden bar through-hole, and the laden bar is fastened to the column or the through hole through the through hole at the side of the beam side, and is fixed with a nut, thereby directly connecting the cast iron bars of the upper and lower portions of the precast concrete beam to the columns without a transfer block The precast concrete column and the dry connection of the beam are shown in Fig.

The present invention has the following object to overcome the disadvantages of the prior art synthetic moment bonding method and prior art.

Korean Patent Publication No. 2010-0121864, November 19, 2010. Korean Patent Publication No. 2006-0102785, September 28, 2006.

It is an object of the present invention to provide a precast concrete frame for a building which is lightweight and economical by reducing the amount of water.

It is another object of the present invention to provide a precast concrete framework for a building which can ensure continuity of beams by a simple method.

According to a preferred embodiment of the present invention, there is provided a concrete structure, comprising: a body having a cylindrical cross-sectional shape in which a hollow is formed; a precast concrete column integrally formed with the upper end of the body; And the precast concrete on both sides of the precast concrete column is continuous by post tensioning.

According to another preferred embodiment of the present invention, the main concrete receiving grooves are formed at both ends of the precast concrete beam, the sheath pipe is buried so that both ends of the sheath pipe are exposed, and the precast concrete post placed on one side of the precast concrete column A method of inserting a tensile material into a sheath tube installed in the interior of a concrete beam and inserting a tensile material into a sheath tube installed inside the precast concrete beam which is mounted on the other side of the joint between the precast concrete column and the length of the precast concrete beam The prestressed concrete beams positioned on the outermost side of the sheath tube are tensioned and the tensioned materials are tensioned on the outermost precasted concrete beams so that a plurality of precast concrete Characterized in that the beam is continuous A precast concrete frame is provided.

According to another preferred embodiment of the present invention, the piles are formed at positions spaced a predetermined distance inward from the end portions of the precast concrete, the fixing holes are provided between the pockets and the end portions, the sheath pipes are connected to the fixing holes to the outside, Precast Concrete Beams are mounted on precast concrete columns and then inserted through the pockets of precast concrete beams placed on one side of the precast concrete columns and passed through the joints of columns and beams to the pockets of precast concrete beams on the other side And the precast concrete beams located on both sides of the precast concrete column are connected to each other by being fixed by using a fixture after being stretched.

According to another preferred embodiment of the present invention, the opening is formed in the circumference of the body so as to communicate with the hollow of the body, so that the hollow can be filled with the concrete. The surface surrounding the hollow of the body is treated with a rough surface There is provided a precast concrete frame for a building using a pre-cast concrete beam which is continuous in a post-tensioning manner, characterized in that the adhesive strength to the concrete to be filled is increased.

According to the present invention, the pillar member is a hollow hollow cylindrical cross-section having a hollow inside and is economical because the amount of concrete is reduced as well as being lightweight. It is possible to install a tensile material after the beam is mounted on the pillar, It has a merit that the field work is simple and the structure is simple to secure continuity. In addition, post-tensioning is effective in designing the cross-section of the beam by serializing the beam over multiple beams. In addition, since the beams are continuous by the post tensioning, the integrity of the column and the beam joint is improved and the seismic performance is improved.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is a view showing a precast concrete column according to the present invention, wherein (a) is a perspective view and (b) is a sectional view taken along line AA.
2 is a view showing a precast concrete beam according to the present invention, wherein (a) is a perspective view and (b) is a cross-sectional view taken along the line BB.
3 is a perspective view illustrating a precast concrete beam according to another embodiment of the present invention.
FIG. 4 is a view showing a construction of a precast frame using the beam shown in FIG. 2. FIG.
FIG. 5A is a view showing a construction of a precast frame using beams shown in FIG. 3. FIG.
FIG. 5B is a view showing another embodiment of the construction of the precast frame using the beam shown in FIG. 3. 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 is composed of a precast concrete column having a cylindrical sectional shape in which a hollow is formed and an upper part is integrally formed with a pillar and a precast concrete beam mounted on the pillar, . In the following, the construction of columns and beams will be described in detail with reference to the drawings, followed by the construction of these columns and beams.

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

1, a precast concrete column 10 (hereinafter, simply referred to as a "PC column") according to the present invention has a cylindrical body 11 having a hollow 11a formed therein, 12 are integrally formed. By constructing the hollow cylindrical section as described above, it is possible to reduce the weight of the column member and to reduce the amount of concrete, thereby ensuring economical efficiency. The PC column 10 is reinforced by a reinforcing bar like a general PC column. A plurality of main rods 111 are arranged in the longitudinal direction, and the PC columns 10 are arranged at regular intervals along the longitudinal direction so as to surround the main rods 111, And a plurality of large rods 112 are laid out in a direction perpendicular thereto. The main rope 111 protrudes a predetermined length upward from the top 12 so that the pillars of the upper and lower layers can be integrally connected to each other. The shoulder 12 should have a width that allows the precast beam to rest, and the shape need not necessarily be limited to the rectangular plate shape shown. The opening 12a communicating with the hollow 11a of the body 11 is formed in the top 12 so that the hollow 11a inside the body 11 can be filled with concrete and the hollow 11a The surrounding surface can be treated with a rough surface to increase the adhesion to the filled concrete. In addition, a reinforcing bar 113 for assembling the PC beam 20 penetrating the both ends of the PC beam 20 is protruded to prevent the falling of the PC beam 20 during the assembly of the PC beam 20, .

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

As shown in FIG. 2, the precast concrete beam 20 (hereinafter also simply referred to as 'PC beam') according to the present invention has a rectangular cross-sectional shape, and main ropes 111, Receiving grooves 20a are formed. The PC beam 20 is reinforced by a reinforcing bar in the same manner as a general PC beam. A plurality of main ropes 21 are arranged in the longitudinal direction, and a plurality of main ropes 21 are arranged in the longitudinal direction And a plurality of coats 22 are arranged in a direction perpendicular to the plane. A certain length of the stay 22 protrudes from the upper surface of the PC beam 20 to increase the adhesion with the overwhelming concrete. A sheath tube 23 is embedded in the PC beam 20 and both ends of the sheath tube 23 are exposed on the upper surface of the beam 20. [ The PC beam 20 according to the present embodiment has a structure in which the PC beam 20 is placed on the PC column 10 as described later and then passed through the PC beam 20 positioned on the line extending in the longitudinal direction of the beam, A plurality of PC beams 20 can be connected at the same time by one tension work by disposing a tensile material inside the PC board 20 and tensioning the tension members respectively at the outermost PC beam 20. [ In order to reduce the weight of the PC beam 20, a block-out portion 20b may be provided between the receiving recess 20a and the housing 20 on both sides.

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

The precast concrete beam 20 'according to the present embodiment is formed with pockets 24 at positions spaced inwardly from the ends by a predetermined distance and a fixture 25 is provided between the pockets 24 and the ends, A sheath tube 26 is provided toward the outside. The PC beam 20 'is reinforced by a plurality of main ropes 21 and a ridge 22 in the same manner as the above-described embodiment, and the ridge 22 is protruded by a predetermined length from the upper surface of the PC beam 20. As described later, the PC beam 20 'according to the present embodiment is mounted on the column 10, and after the tension member is inserted through the pockets 24, the PC beam 20' is fixed by using the fixture 25, The PC beam 20 'located at the center can be connected to each other.

FIG. 4 is a view showing a construction of a precast frame using the beam shown in FIG. 2. FIG.

4, the PC beam 20 is placed on both sides of the top 12 of the PC column 10 and the stress material 30 is inserted into the sheath tube 23 provided inside the PC beam 20 The tensioning member 30 is inserted into the sheath tube 23 provided inside the neighboring PC beam 20 through the joining portion with the post PC column 10 so as to extend in the longitudinal direction of the PC beam 20 The tension members 30 are disposed in the sheath tube 23 so as to penetrate all the PC beams 20 positioned thereon and the tension members 30 are tensioned and fixed on the PC beams 20 positioned on the outermost side, The plurality of PC beams 20 can be continuously connected at the same time.

As described above, in the precast concrete frame according to the present embodiment, the PC beams 20 on both sides of the PC column 10 are successively fixed by tensioning and fixing the tension members 30 continuously disposed over the joining portions of the columns and the beams. Therefore, there is an advantage in that it is easier to continue the neighboring beam at the junction of the column and the beam compared to the conventional composite moment bonding method. In a single tension operation, the beam is observed at the junction of all the columns and beams located on the same line in the longitudinal direction of the beam There is an advantage that it can be continuous.

Thereafter, the precast concrete slab is placed between the PC beams 20, the upper slab reinforcing bar is laid, and the overwritting concrete 40 is laid. Thus, a one-layer precast concrete frame is completed. Thereafter, the upper PC column 50 is connected to the PC column 10 of the lower layer by using the main rope 111 exposed on the top 12, and as described above, , Slab mounting and filling concrete pouring (40) are repeated to complete the frame.

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

In this embodiment, unlike the above-described embodiment, all of the PC beams 20 are not continuous in one tension operation, but the PC beams 20 'located on both sides of the PC column 10 are continuous with each other. According to the present embodiment, it is necessary to repeat the process of placing the tension members 30 on the PC beams 20 'mounted on both sides of the column through the column-to-beam joints for each column-to-beam joint and tightly fixing them. The precast concrete beam 20 'can be continuous.

More specifically, the PC beam 20 'is mounted on the PC column 10, and then the tension member 30 is inserted through the pockets 24 of the PC beam 20' mounted on one side of the PC column 10, The PC beam 20 'located on both sides of the PC column 10 is fixed by using the fixing port 25 after being stretched after being projected to the pockets 24 of the other PC beam 20' They can be connected to each other.

Thereafter, a precast concrete slab is placed between the PC beams 20 ', the upper slab reinforcing bar is laid, and the overwritting concrete 40 is laid. Thus, a one-layer precast concrete frame is completed. Thereafter, the upper PC column 50 is connected to the lower PC column 10 by using the main rope 111 exposed on the top 12, and as described above, the PC beam 20 ' 20 ') sequencing, slab mounting and filling concrete pouring (40) are repeated to complete the frame.

Although the PC column 10 has been described as a single-storey single-storey system, the present invention can be similarly applied to a two-storey single-storey PC column 10 as shown in FIG. 5B.

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 pole
11: Body
11a: hollow
12: Top
12a: opening
20, 20 ': PC beam
20a: receiving groove
23, 26: Sheath tube
25: anchorage
30: Tension material
40: Overburdened concrete
50: upper layer PC column

Claims (4)

A precast concrete column including a body having a cylindrical cross-sectional shape having a hollow formed therein, a main shaft integrally formed at an upper end of the main body,
The precast concrete beams are mounted on both sides of the pillar of the precast concrete column. The end portions of the precast concrete pillars are formed with receiving grooves through which main beams protruding above the pier are respectively inserted.
In order to prevent falling of the precast concrete beams during the assembly of the precast concrete beams, the reinforced concrete beams for reinforcing the precast concrete beams are installed so as to penetrate the ends of the precast concrete beams,
Wherein the precast concrete on both sides of the precast concrete column is continuous by post tensioning. The precast concrete frame for a building using post-tensioned continuous precast concrete beams. The method according to claim 1,
At both ends of the precast concrete beams, main-groove receiving grooves are formed, and a sheath pipe is buried so that both ends of the sheath pipe are exposed.
A prestressed concrete beam is placed on one side of a precast concrete column. After the tension member is inserted into the sheath tube, a sheath tube installed inside the precast concrete beam, which passes through the joint with the precast concrete column, A prestressed concrete beam is inserted into the sheath tube so as to penetrate all of the precast concrete beams extending in the longitudinal direction of the precast concrete beam and the tensioned material is tensioned and fixed in the outermost precast concrete beam And a plurality of precast concrete beams are continuously formed at the same time by one tensioning operation. The precast concrete frame for buildings using post-tensioned continuous precast concrete beams. The method according to claim 1,
The precast concrete is formed with pockets at positions spaced a certain distance inward from the end of the concrete, a fixing port is provided between the pocket and the end, a sheath pipe is connected to the fixing port toward the outside,
Precast Concrete Beams are mounted on precast concrete columns and then inserted through the pockets of precast concrete beams placed on one side of the precast concrete columns and passed through the joints of columns and beams to the pockets of precast concrete beams on the other side And the precast concrete beams located on both sides of the precast concrete column are continuously connected to each other by fixing them by using an anchorage hole after protruding and then tightening the precast concrete beams. The precast concrete frame for buildings using the post tensioned continuous continuous precast concrete beam. The method according to claim 1,
The hollow of the body is configured to fill the hollow in the body by forming an opening communicating with the hollow of the body, and the surface surrounding the hollow of the body is treated with a rough surface to increase the adhesion with the filled concrete Precast concrete frame for buildings using post - tensioned continuous precast concrete beams.

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