KR20150033391A - Precast concrete tilt-up frame and method for constructing precast concrete structural frame building using the same - Google Patents

Abstract

The present invention relates to a method for constructing a building using a precast concrete member. More specifically, the present invention relates to a precast concrete tilt-up frame and a method for constructing a precast concrete structural frame building using the same which are to quickly, safely, and economically construct a building having a standardized plane and a simple structure such as a logistic facility, an underground parking lot, and the like. According to a proper embodiment of the present invention, the precast concrete tilt-up frame comprises: a pair of pillars arranged in parallel while being mutually separated, and where two or more layers have the length corresponding to the height; inner beams for each layer arranged between each pillar at each layer height of each pillar, and where both ends are integrally combined with the pillars; and protruding beams of each layer protruding toward the outside of one or both pillars at each layer height of each pillar for a certain length.

Description

TECHNICAL FIELD [0001] The present invention relates to a precast concrete tilt-up frame and a precast concrete frame structure using the precast concrete frame,

The present invention relates to a method of constructing a building using a precast concrete member, and more particularly, to a method of constructing a precast concrete precast concrete Tilt-up frame, and a method of constructing a precast concrete frame structure using the tilt-up frame.

Logistics facilities are characterized by high storeys, simple structure, and rapid operation for investment recovery. Accordingly, the use of precast concrete (PC) method, which can expect labor and cost reduction and shortening of air, can secure competitiveness compared to a concrete block installed in the field (RC).

The PC method is applied to underground parking lots, semiconductor factories, stadiums, storerooms, public housing, etc., which are flat in the form of planes in addition to the logistics facilities. The introduction of prestresses allows long spans and heavy loads, And efforts have been made to overcome the disadvantages of the PC construction method by improving the safety of construction and hybridization of the frame using steel slab and slab.

BACKGROUND ART [0002] As a technique to be a background of the present invention, there is a prestressed long-span precast frame structure system disclosed in Japanese Patent Application Laid-Open No. 10-2004-0003452 (Patent Document 1). This prior patent uses reinforced concrete between the longitudes, which makes it possible to reduce the construction cost of the building and to use the first and second beams with the length of the span rather than the steel structure, A prestressed long-span precast frame structure system that can be used for construction of buildings such as discount stores and parking lots where the span is longer than that of a building to be used and the length of the span is long, is proposed. This prior art has the advantage that the long span building can be economically constructed, but since the column and the beam member must be assembled in the field, there is a disadvantage in that the number of times of work for assembly of the members for assembly increases and the air is lengthened.

Another technology to be a background of the present invention is a method of constructing a building using a precast concrete column of Patent No. 10-0937745 (Patent Document 2). This prior art patent is capable of simultaneously performing the framing operation and the slab operation in different layers and has the advantage of ensuring the integrity of the column and the beam, but since the column and the beam member must be assembled in the field, The number of operations is increased and the air is lengthened.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the disadvantages of the conventional PC method described above and has the following purpose.

Korean Patent Publication No. 10-2004-0003452 'Prestressed long-span precast frame structure system' (disclosed on Jan. 13, 2004) Korean Patent No. 10-0937745 'Construction method using precast concrete column' (Registered on Jan. 12, 2010)

The present invention eliminates the disadvantages of the conventional PC method which is limited in length due to limitations in transportation due to factory production, minimizes double work for assembling members in the field, and can significantly shorten the air and improve the safety of construction And a method of constructing a precast concrete frame structure using the pre-cast concrete tilt-up frame.

The on-site pre-cast concrete tilt-up frame according to a preferred embodiment of the present invention comprises a pair of columns spaced apart from each other in parallel and having a length corresponding to a height of two or more layers, And each of the inner layer beams having respective ends connected to the column integrally with each other, and each layer inner tube having a certain length protruded outward from one column or both columns at the height of each layer of each column.

In this case, a mounting surface for mounting the precast concrete slabs may be formed on both sides at the height between the upper surface and the lower surface, so that the entire inner T-shaped section and the upper T- .

A method of constructing a precast concrete frame structure using a site-produced precast concrete tilt-up frame according to the present invention comprises the steps of: (a) arranging a site site for a building and constructing a foundation corresponding to the installation position of the column; (b) forming a form floor layer for use as a bed for producing a field pre-cast concrete tilt-up frame according to claim 1 in a site site; (c) installing a mold on the top of the formwork floor, placing reinforcing bars in the formwork, and placing the concrete to manufacture the on-site precast concrete tilt-up frame as set forth in claim 1; (d) installing the frame using the cope after the frame reaches the strength required for the erecting operation; (e) forming a bottom layer after completing the frame building operation; (f) installing a central beam between the exits of each layer of the frame, connecting the frames in the uniaxial direction, connecting the columns of the frames parallel to each other in the direction of the other axis orthogonal to the uniaxial direction ; And (g) providing a bottom plate between the inner beams of each layer parallel to each other and perpendicular to the longitudinal direction of the inner beam between the inner beams and the connecting beams of the respective layers parallel to each other, And pouring the concrete.

In the step (c), when the concrete reaches the predetermined strength, the peeling material is applied to the surface of the concrete, and then the reinforcing bars are laid and the concrete is laid repeatedly so that a plurality of frames can be formed into a single die have.

In the step (f), the exudate of each layer and the central portion connecting the exits may be simply bonded to form a gelbeam.

According to the on-site pre-cast concrete tilt-up frame of the present invention, the disadvantage of the conventional PC method which is limited in length due to transportation restrictions due to the factory production is solved, and the work for assembling the members in the field is minimized, Can be remarkably shortened and the structural safety of the direction in which the column and the beam are integrally manufactured is excellent, which can improve the safety of construction.

According to the construction method of the precast concrete frame structure using the on-site precast concrete tilt-up frame of the present invention, the construction time can be shortened significantly due to the decrease in the number of rounds and the risk of collapse of the frame It is possible to greatly reduce the construction cost because the transportation cost is not generated as compared with the case where it is manufactured in the factory and transported to the site.

Further, in the present invention, since the beams connecting the frames to each other become gelbeams, the inflection points of the bending moments are forcedly moved to the ends of the beams to reduce the end moments, thereby reducing the height of the center beams connecting the frames. .

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.
FIG. 1A is a perspective view illustrating a pre-cast concrete tilt-up frame according to the present invention.
FIG. 1B is a perspective view of a pre-cast concrete tilt-up frame in accordance with the present invention.
Fig. 2 is a cross-sectional view showing inner side beams constituting a field-produced precast concrete tilt-up frame according to the present invention.
FIG. 3A is an elevational view of a three-span precast concrete frame structure using on-site pre-cast concrete tilt-up frames according to the present invention.
FIG. 3B is an elevational view of a precast concrete frame structure of a five-span structure using a field-produced precast concrete tilt-up frame according to the present invention.
FIGS. 4A to 4G are views showing a construction method of a precast concrete frame structure of a five-span structure using a field-produced precast concrete tilt-up frame according to the present invention.

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.

FIG. 1 is a perspective view showing a pre-cast concrete tilt-up frame according to the present invention, FIG. 1 (b) is a perspective view showing a pre-cast concrete tilt- Fig. 5 is a cross-sectional view showing inner side beams of each layer constituting a tilt-up frame.

As shown in FIG. 1A, a pre-cast concrete tilt-up frame 10A (hereinafter, simply referred to as an end frame 10A) according to the present invention is manufactured on site and is a part of an entire precast concrete frame structure A pair of columns 11 and 11, an inner layer beam 12 and an inner layer beam 13 of each layer.

Specifically, the end-site on-site precast concrete tilt-up frame 10A comprises a pair of columns 11 and 11 arranged parallel and spaced apart from each other and having a length of two layers, Each of which is disposed at one side of the column and integrally joined at both ends thereof to the column, and a plurality of projecting inner layers And a beam 13.

The pair of pillars 11 each have a rectangular cross-sectional shape and have a length of two layers in height. The spacing between the pair of pillars 11 is determined corresponding to the installation position of the pillars according to the plan plan.

Each layer inner beam 12 is composed of a single member and disposed between the pillars 11, 11 horizontally with respect to the paper at the height of each layer, and both ends are integrally joined to the pillars 11, In Fig. 1A, each in-layer beam 12 is strongly bonded between pillars 11 and 11 at a two-layer height and a three-layer height, respectively. 2, the inner side beams 12 block out upper side surfaces of a rectangular cross section so that a mounting surface 123 for mounting the precast concrete slab is formed between the upper surface 121 and the lower surface 122 But it may be a rectangular cross section in which the elevation surface 123 is not separately formed and the precast concrete slab is mounted on the upper surface 121.

Each layer inner beam 13 protrudes outward from one of the pillars 11 at the same height as the inner beam 12 of each layer. It is preferable that the projecting length of the externally exposed beam 13 of each layer has a length corresponding to the length of the section of the moment, and the length is determined by the structural design and construction property, and the length of 1/3 to 1/4 Lt; / RTI > Each layer inner beam 13 has the same cross-sectional shape as the inner layer beam 12 of each layer.

As described above, the end-field pre-cast concrete tilt-up frame 10A according to the present invention is constructed such that the pillars 11 and 11 and the inner beam 12 are strongly bonded to each other, Shaped frame structure having the externally-

On the other hand, when the span of the structure is 5 spans or more in the direction in which the frame is installed, as shown in Fig. 1B, the sub-beams 13 and 13 in the respective layers are protruded outward from the pillars 11 and 11 An inner site pre-cast concrete tilt-up frame 10B (hereinafter simply referred to as an inner frame 10B) is required. Therefore, in the case of five spans, the end frames 10A are positioned on both sides of the inner frame 10B, respectively, as shown in Fig. 3B.

FIG. 3A shows an elevation view of a three-span precast concrete frame structure using a field-produced precast concrete tilt-up frame according to the present invention, and FIG. 3B shows an elevation view of a precast concrete frame structure having a five- have.

As shown in FIG. 3A, when the end frame 10A according to the present invention is installed upright in correspondence with the position where the column is to be installed according to the plan plan, two on-site production precast concrete tilt-up frames 10A and 10A, Are spaced apart at intervals corresponding to the spacing between the externally-exposed beams 13 of each layer. Thereafter, a center beam 20 is installed between the opposing inner beam 13 of each layer.

At this time, it is preferable that the inner beam 13 of each layer and the central beam 20 connecting thereto are simply joined so as to transmit only the shearing force. Therefore, the view of the precast concrete frame structure using the field-produced precast concrete tilt-up frame 10A according to the present invention becomes structurally gelbebo type. As described above, according to the present invention, the center beam 20 connecting the end frames 10A to each other is formed by forcing the inflection point of the bending moment to the end side of the beam by reducing the number of end portions, It is possible to reduce the height.

In addition, when the precast concrete frame structure having a height of two spans of three spans is constructed by using the pre-cast concrete tilt-up frame 10A according to the present invention, when one side is used as a reference, 10A) and the installation of the two central beams 20 can complete the frame, so that the double working of the inner beam 12 of each layer is omitted compared with the conventional one. That is, Can be shortened. In addition, since only the central beam 20 is carried on the site, the risk of collapse of the frame during construction due to the drop of the most dangerous beams in the precast concrete frame construction is greatly reduced And safety is improved during construction. In addition, since the end frame 10A according to the present invention is manufactured in the field, transportation costs are not generated compared with the case where the end frame 10A is manufactured in the factory and transported to the site, which can greatly reduce the construction cost.

3B, when the pre-cast concrete frame structure of five span structure is constructed, an inner frame 10B is provided between the two end frames 10A, 13, a central beam 20 is provided.

Although the frames 10A and 10B have been described as having two layers of height in the above description, they can be manufactured in three or more layers according to the field conditions and the capability of the weight of the apparatus.

Hereinafter, a construction method of a precast concrete frame structure having a two-layer five-span structure using a field-produced precast concrete tilt-up frame according to the present invention will be described in detail with reference to the drawings.

FIGS. 4A to 4G are views showing a method of constructing a precast concrete frame structure using a field-produced precast concrete tilt-up frame according to the present invention in order.

First, the basement 30 is constructed in correspondence with the installation position of the column inside the site site where the building is to be installed. The foundation 30 may be a pile foundation or an independent foundation form, depending on the underlying conditions (see FIG. 4A). At this time, in order to prevent the frames 10A and 10B from being conducted, an auxiliary base 35 for supporting a supporting member may be further provided corresponding to the position of the supporting member 60 supporting the frames 10A and 10B.

Next, a form bottom layer 41 is formed in order to utilize a field to produce a field pre-cast concrete tilt-up frame on site. The area of the forming bottom layer 41 is determined by the height and width of the frames 10A and 10B (see Fig. 4B).

Subsequently, molds 50A and 50B for producing a field-produced precast concrete tilt-up frame are installed on the formwork bottom layer 41. [ In the drawing, reference numeral 50A denotes a mold for manufacturing an end-field-made precast concrete tilting-up frame 10A, and reference numeral 50B denotes a mold for manufacturing an inner-site-produced precast concrete tilting-up frame 10B. Thereafter, reinforcing bars are installed in the dies 50A and 50B, and concrete is laid (see Fig. 4C). When the concrete reaches the predetermined strength, the peeling material is applied to the surface of the concrete, then the reinforcing bars are laid and the concrete is laid repeatedly. As described above, in the present invention, one frame (10A or 10B) reaches a predetermined strength in a mold using one mold (50A or 50B), and then the frame (10A or 10B) In other words, a plurality of frames are manufactured by using a single mold in a multi-stage compact production method. Therefore, a plurality of frames can be produced even in a narrow space.

Subsequently, after each of the frames 10A, 10B reaches the strength required for the erecting work, the frames 10A, 10B are installed by using the double-purpose apparatus (see Fig. 4D). The method of installing the columns 11 constituting each of the frames 10A and 10B on the foundation 30 can be appropriately selected from known methods. At this time, each of the frames 10A and 10B is supported by a support member 60 to prevent conduction. One end of the support member 60 is supported by a column constituting each of the frames 10A and 10B, Respectively. On the other hand, the molds 50A and 50B must be dismantled before the frames 10A and 10B are installed at the portions where the molds 50A and 50B are installed.

Next, when the frames 10A and 10B are completely formed, the bottom layer 42 is formed (see Fig. 4E). The bottom layer 42 may be formed only on a portion other than the form bottom layer 41 or over the entire floor.

Finally, the center beam 20 is provided at the height of each layer between the frames 10A and 10B to connect the frames 10A and 10B in the same line and in the x-axis direction in the drawing, 10B are connected to each other at a height of each layer by connecting beams 70, that is, beams arranged in the y-axis direction in the drawing (refer to FIG. 4F). Therefore, the connecting beam 70 connects the frames 10A and 10B, which are parallel to each other at the height of each layer, perpendicular to the beam 12 constituting the frames 10A and 10B. When the frames 10A and 10B are connected in the x- and y-axis directions through the center beam 20 and the connecting beam 70, the supporting member 60 is removed. The center beam 20 and the connecting beam 70 can be manufactured on-site in the same manner as the frames 10A and 10B, but factory pre-cast concrete members can also be applied.

Thereafter, between each pair of inner side beams 12 parallel to each other and each of the inner layer beams 13 connected to each other and the connecting beam 70, 80 are installed on the bottom plate 80 and the topping concrete is laid on the bottom plate 80, the frame construction is completed (see FIG. 4G).

As described above, according to the present invention, since the precast concrete frame structure is constructed by using the on-site precast concrete tilt-up frame, it is possible to drastically reduce the number of workings and significantly reduce the construction period and the construction cost. In addition, since the frame is manufactured in the site where the building is to be constructed, no additional transportation cost is required.

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.

10A: Pre-cast concrete tilt-up frame
10B: In-house production pre-cast concrete tilt-up frame
11: Column 12: Inner beam
13: Emissary beam 20: Central part
30: Foundation 41: Former flooring
42: bottom layer 50A, 50B: formwork
60: supporting member 70: connecting beam
80: bottom plate

Claims (5)

A pair of pillars spaced apart from each other in parallel and having a length corresponding to a height of two or more layers,
Each of the inner layer beams disposed between the columns at the height of each layer of each column and having both ends integrally joined to the column,
Wherein each column has a height at each layer, and each column includes exit beams each having a predetermined length protruding outward from the column. The method according to claim 1,
And a mounting surface for mounting the precast concrete slab is formed on both sides at the height between the upper surface and the lower surface so that the T-shaped section is entirely formed as a whole. On - site precast concrete tilt - up frames. (a) arranging on-site sites for building construction and constructing bases corresponding to installation positions of pillars;
(b) forming a form floor layer for use as a bed for producing a field pre-cast concrete tilt-up frame according to claim 1 in a site site;
(c) installing a mold on the top of the formwork floor, placing reinforcing bars in the formwork, and placing the concrete to manufacture the on-site precast concrete tilt-up frame as set forth in claim 1;
(d) installing the frame using the cope after the frame reaches the strength required for the erecting operation;
(e) forming a bottom layer after completing the frame building operation;
(f) installing a central beam between the exits of each layer of the frame, connecting the frames in the uniaxial direction, connecting the columns of the frames parallel to each other in the direction of the other axis orthogonal to the uniaxial direction ; And
(g) Provided between the inner beams of each layer parallel to each other and between the inner beam and the connecting beam of each layer parallel to each other, perpendicular to the longitudinal direction of the inner beam, and the top plate The method of claim 1, wherein the pre-cast concrete tilt-up frame comprises a pre-cast concrete tilt-up frame. The method of claim 3,
In the step (c), when the concrete reaches the predetermined strength, the peeling material is applied to the surface of the concrete, and then the reinforcing bars are laid and the concrete is laid repeatedly to thereby form a plurality of frames into a single mold in a multi- A Method of Construction of Precast Concrete Framed Buildings Using Precast Concrete Tilt - up Frames. The method of claim 3,
(f), the inner joints of each layer and the central portion connecting the inner joints are simple joined so as to form a gelbeam shape. The method of constructing the precast concrete frame structure using the on-site precast concrete tilt-up frame.

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