PRECAST CONCRETE MEMBER WITH PREFABRICATED PLATE AND FIXING CHANNELS

Abstract

The present invention relates to a precast concrete member using a PC member, which comprises a prefabricated plate and fixing channels, and is used as a linear member for a column which is an axial force member, as a planar member for a wall which is an axial force member, or as a linear member for a beam or a girder which is a flexural member. A preferred embodiment of the present invention provides a premade precast concrete member having a PC body formed at a predetermined length and multiple steel reinforcements embedded within the PC body along the longitudinal direction, the precast concrete member comprising: a plate assembly in which a pair of board-like plates having a pair of coupling holes formed to be penetrated at a regular interval are formed so as to be spaced apart from each other and to face each other, or two pairs of board-like plates are spaced apart from each other so as to face each other, with one end of each thereof being embedded into one or both longitudinal ends of the PC body, and the other ends thereof protruding, wherein the plate assembly comprises a connecting member of which a part embedded into the PC body of the plate is welded to one side of the steel reinforcement, and both ends are respectively bolt-coupled to the coupling holes of a pair of plates so as to connect a part embedded into the PC body of a pair of facing plates; and fixing channels which comprise a U-shaped channel having an opening formed on the top thereof and multiple anchor bodies coupled to the rear surface of the U-shaped channel, the opening of the U-shaped channel comprising a rib which is formed to be bent inwardly, wherein at least two rows of fixing channels are embedded at regular intervals into one side surface of the width direction of the PC body or into at least one pair of corresponding surfaces of the width direction of the PC body.

Claims

1. A precast concrete (PC) member having assemblable plates and fixing channels and comprising: a PC body (10) having a certain length; a plurality of rebars (11) embedded in the PC body along a length direction of the PC body (10); a plate assembly (20) comprising: one or more pairs of plates (21) spaced apart from one another to face each other, each comprising a pair of coupling holes (211) at a certain interval, and configured in such a manner that ends of the plates are embedded in and other ends of the plates protrude from one or more length direction-ends of the PC body (10) and that parts of the plates (21) embedded in the PC body (10) are welded to ends of the rebars (11) being in contact with and extending in parallel with the embedded plates; and connection members configured in such a manner that two ends of each connection member (22) are coupled to the coupling holes (211) of a pair of the plates (21) facing each other, using bolts (24) to interconnect the embedded parts of the plates facing each other; and two or more fixing channels (30) embedded at a certain interval in a width-direction side surface or two or more corresponding width-direction side surfaces of the PC body (10), and each comprising: a U-shaped channel (31) having an opening (312) in a top surface of the U-shaped channel (31); a plurality of anchor structures (32) coupled to a rear surface of the U-shaped channel (31); and lips (311) bent inward from the opening (312) of the U-shaped channel (31).

2. The PC member according to claim 1, wherein toothed gear parts (313) are provided on inner surfaces of the lips (311) of the fixing channel (30).

3. The PC member according to claim 1, wherein each of the anchor structures (32) of the fixing channel (30) comprises: a stem (38) welded to the rear surface of the U-shaped channel (31) and configured as a steel plate; and an anchor head (39) welded to an outer end of the stem (38) and configured as a steel plate.

4. The PC member according to claim 1, wherein reinforcing angles (23) are vertically coupled to inner corners of the connection members (22) crossing each other in a cross section of the plate assembly (20).

5. The PC member according to claim 1, wherein a plurality of bent rebars (15) are partially embedded in and partially and perpendicularly protrude from a width-direction side surface of the PC body (10).

6. The PC member according to claim 1, wherein a girder connection part (40) perpendicularly protruding from the PC body (10) by a certain length is integrally provided on a width-direction side surface of the PC body (10), and wherein the plate assembly (20) is configured in such a manner that an end of the plate assembly (20) is embedded in and another end of the plate assembly (20) protrudes from a length-direction outer end of the girder connection part (40).

7. The PC member according to claim 1, wherein the plate assembly (20) is provided at each of two sides of each of two length-direction ends of the PC body (10), wherein a plurality of bent rebars (57) are partially embedded in and partially and perpendicularly protrude from parts between the plate assemblies (20) of the two sides, and wherein two or more fixing channels (30) are embedded at a certain interval in each of width-direction side surfaces of the PC body (10).

Description

DESCRIPTION OF DRAWINGS

[0021] FIG. 1 is a front view of a precast concrete (PC) member having assemblable plates and fixing channels, according to the present invention.

[0022] FIGS. 2A, 2B, and 2C are cross-sectional views taken along lines A-A, B-B, and C-C of FIG. 1.

[0023] FIG. 3 is a perspective view showing an embodiment of the fixing channel used in the PC member having assemblable plates and fixing channels according to the present invention.

[0024] FIG. 4 is a schematic view showing an embodiment of connection parts of the PC member having assemblable plates and fixing channels according to the present invention.

[0025] FIGS. 5A, 5B, and 5C are perspective views showing other embodiments of the PC member having assemblable plates and fixing channels according to the present invention.

[0026] FIGS. 6A and 6B are perspective views of PC columns according to conventional technologies.

BEST MODE

[0027] FIG. 1 is a front view of a precast concrete (PC) member having assemblable plates 21 and fixing channels 30, according to the present invention.

[0028] As illustrated in FIG. 1, the PC member 1 having assemblable plates and fixing channels according to the present invention includes a PC body 10 having a certain length, a plurality of rebars 11 embedded in the PC body 10 along a length direction of the PC body 10, a plate assembly 20, and the fixing channels 30, and may be used as a column, a girder or beam, a wall, etc.

[0029] FIGS. 2A, 2B, and 2C are cross-sectional views taken along lines A-A, B-B, and C-C of FIG. 1.

[0030] The plate assembly 20 may include two plates 21 spaced apart from one another to face each other, or four plates 21 provided to form a rectangular cross-section as illustrated in FIG. 2A. As illustrated in FIG. 2B, the plates 21 embedded in the PC body 10 to face each other are coupled together using connection members 22. Particularly, the plates 21 embedded in the PC body 10 are provided in parallel with rows of the embedded rebars 11 and are welded to ends of the rebars 11.

[0031] In general, the sectional properties of the PC member are determined based on sectional dimensions of the PC body 10 and the rebars 11 embedded in the PC body 10. To ensure continuity in the sectional properties of the PC member, the same embedded depth in concrete and the same tensile capacity as the rebars 11 embedded in the PC member should be ensured in parts where two PC members are interconnected.

[0032] Therefore, a bolting-type plate assembly 20 is used to ensure continuity in the embedded depth in concrete of the rebars and to easily adjust the depth by welding the ends of the rebars being in contact with and extending in parallel with the embedded plates to the plates 21. As such, the plates 21 embedded in the PC body 10 are welded to the ends of the rebars 11 and are lap-spliced with the rebars 11 to equally transfer the tensile capacity of the rebars 11 to the plates 21, thereby ensuring continuity in the sectional properties and the tensile capacity of the PC member. However, when general rolled structural steel (e.g., H-beam) is used, the same embedded depth in concrete and the same tensile capacity as the rebars embedded in the PC member may not be easily ensured.

[0033] The PC member 1 having assemblable plates and fixing channels according to the present invention is usable as a column or a girder or beam. As such, when used as a girder or beam, as illustrated in FIG. 5A, two plates 21 may be spaced apart from one another to face each other and thus may be easily coupled not only to the PC member 1 according to the present invention but also to a typical column using brackets. As illustrated in FIGS. 2A and 2B, when used as a column, four plates 21 may be provided to have a rectangular cross-section.

[0034] Each of the plates 21 has a certain length and a certain width, and includes coupling holes 211 at a certain interval. When four plates 21 are provided to have a rectangular cross-section, corners of neighboring plates 21 are not in contact with each other but are spaced apart from one another by a certain distance. Thus, when embedded in the PC body 10, the plates 21 do not disconnect inner and outer parts from each other.

[0035] Although not shown in the drawings, the plates 21 may have a curvature in a cylindrical column, or two or more plates 21 may be provided at desired geometric locations in an irregular column.

[0036] The connection members 22 may have various shapes, e.g., channels, angles, or plates, and reinforcing angles 23 may be coupled to parts where the connection members 22 cross each other.

[0037] The above-described bolting part of the plate assembly 20 serves as a shear connector to integrate the PC body 10 and the plates 21 without using stud bolts.

[0038] In the present invention, as illustrated in FIG. 2B, the embedded depth in concrete of the rebars 11 vertically embedded in the PC body 10 is constantly maintained and the ends of the rebars 11 are welded to the plates 21.

[0039] In general, the rebars 11 are embedded in a reinforced concrete member at an outermost depth in concrete excluding a cover depth of concrete. To weld the ends of the rebars 11 to the plates 21 while constantly maintaining the embedded depth in concrete of the rebars 11, the plates 21 should be assemblable so as to be provided at desired locations based on the predetermined embedded depth in concrete of the rebars 11, as in the plate assembly 20 according to the present invention.

[0040] Accordingly, the plates 21 provided in the PC body 10 may be welded to the ends of the rebars 11 being in contact with and extending in parallel with the embedded plates to achieve tensile capacity equal to or greater than that of the embedded rebars 11, thereby ensuring continuity in tensile capacity.

[0041] As illustrated in FIG. 1, ends of the plates 21 are embedded in a length-direction end of the PC body 10, and the other ends of the plates 21 protrude from the PC body 10. The parts of the plates 21 embedded in the PC body 10 and facing each other are coupled together using the connection members 22. The connection members 22 may have various shapes, e.g., channels, angles, or plates, and two ends of each connection member 22 are in contact with inner surfaces of the plates 21 facing each other and are coupled thereto using bolts 24. The above-described connection members 22 constantly maintain the distance between the plates 21 facing each other and couple the plates 21 together, thereby increasing rigidity.

[0042] In the present invention, each of the connection members 22 is configured as a plate bent to have a shape, and two bent ends thereof are coupled to the coupling holes 211 of the plates 21 facing each other, using the bolts 24.

[0043] In general, steel plates are stud-welded to ensure integration with concrete.

[0044] However, the plate assembly 20 according to the present invention may bolt the steel plates 21 together using the connection members 22 to replace stud-welding for ensuring integration with the PC body 10, and the connection members 22 bolted to the plates 21 not only serve as means for ensuring desired locations (heights) of the plates 21, and but also serve as bent rebars.

[0045] The connection members 22 cross each other in a cross section of the plate assembly 20 as illustrated in FIG. 2B, and the reinforcing angles 23 are vertically coupled to inner corners of the connection members 22 crossing each other, thereby reinforcing and maintaining the shape of the plate assembly 20.

[0046] The reinforcing angles 23 may use angles having an L-shaped cross section, or may be replaced with members having various cross sections. The reinforcing angles 23 are vertically provided in the PC body 10 only at parts where the connection members 22 are provided.

[0047] Since ends of the plates 21 are embedded in the PC body 10 and the other ends of the plates 21 protrude from the PC body 10, the embedded plates 21 may be welded to the rebars 11 provided in the PC body 10 to achieve tensile capacity equal to or greater than that of the rebars 11 being in contact with and extending in parallel with the embedded plates, thereby ensuring continuity in tensile capacity.

[0048] Although a conventional coupling method uses couplers for interconnecting rebars, according to the present invention, the plates 21 may protrude from an end of the PC body 10 and the exposed parts of the plates 21 may be connected to an end of a girder or beam using general steel-frame bolting (e.g., high-tension bolting), thereby ensuring continuity in the tensile capacity of the embedded rebars 11.

[0049] In addition, since the above-described method according to the present invention may reduce high accuracy in location which is required in the conventional method using couplers, tolerance may be achieved for coupling errors in construction and thus constructability may be enhanced.

[0050] As illustrated in FIG. 2C, in the PC member 1 having assemblable plates and fixing channels according to the present invention, the fixing channels 30 are embedded in side surfaces of the PC body 10. For brevity, FIG. 2C does not illustrate the rebars 11 in the PC body 10.

[0051] When the fixing channels 30 are embedded in the PC body 10, the fixing channels 30 may be embedded in one or more width-direction surfaces of the PC body 10. Preferably, the fixing channels 30 are embedded in such a manner that a length direction of the fixing channels 30 corresponds to the length direction of the PC body 10, and that openings 312 of U-shaped channels 31 of the fixing channels 30 are exposed from the PC body 10.

[0052] FIG. 3 is a perspective view showing an embodiment of the fixing channel used in the PC member having assemblable plates and fixing channels according to the present invention.

[0053] As illustrated in FIG. 3, the fixing channel 30 includes the U-shaped channel 31 having the opening 312 on a top surface thereof, anchor structures 32 coupled to a rear surface of the U-shaped channel 31, and lips 311 bent inward from the opening 312 of the U-shaped channel 31.

[0054] Each of the anchor structures 32 of the fixing channel 30 may include an anchor head 39 for exerting fixing force on the PC body 10, and a stem 38 for transferring the fixing force to the fixing channel 30. Since an end of the stem 38 configured as a steel plate is welded to the rear surface of the U-shaped channel 31 and the anchor head 39 configured as a steel plate is welded to the other end of the stem 38, the anchor structure 32 may exert excellent anchorage performance on the PC member when high tensile force is applied.

[0055] The anchor structures 32 of the fixing channel 30 illustrated in FIG. 3 merely correspond to an example, and various types (e.g., stud-type) of the anchor structures 32 may be coupled to the rear surface of the U-shaped channel 31.

[0056] Preferably, toothed gear parts 313 are provided on inner surfaces of the lips 311 of the fixing channel 30 such that, when a T-shaped bolt 35 is coupled to the U-shaped channel 31 of the fixing channel 30, the T-shaped bolt 35 does not slide along but is firmly fixed to the opening 312 of the U-shaped channel 31.

[0057] In this case, toothed gear parts may also be provided on head parts of the T-shaped bolt 35 in contact with the inner surfaces of the lips 311 of the fixing channel 30 and may be engaged with the toothed gear parts of the lips to prevent displacement of the T-shaped bolt 35 from the coupled location.

[0058] To couple the fixing channel 30 to a cast-in-place rebar, a dedicated T-shaped bolt 35 in which a T bolt and a rebar are integrated with each other may be used, or a rebar coupler 37 may be used to couple the T-shaped bolt 35 to a threaded rebar 36 as illustrated in FIG. 3.

[0059] The above-described fixing channels 30 may be provided at a certain length-direction height or multiple length-direction heights of the PC body 10.

[0060] FIG. 4 is a schematic view showing an embodiment of connection parts of the PC member 1 having assemblable plates and fixing channels according to the present invention.

[0061] Particularly, operations and functions of the plate assembly 20 and the fixing channels 30 in the PC member 1 having assemblable plates and fixing channels according to the present invention will now be described in detail with reference to FIG. 4. In the present invention, the PC member 1 having assemblable plates and fixing channels may be used as both a column and a girder or beam. For brevity, FIG. 4 illustrates a column 1, an upper column 1a, and a girder 1b.

[0062] As illustrated in FIG. 4, for column-to-column connection, a plate assembly 20a under the upper column 1a and the plate assembly 20 on the lower column 1 are firmly bolted together using auxiliary hardware 48 such as connection plates.

[0063] That is, the plate assemblies 20 and 20a of the columns 1 and 1a are parts for equally and continuously transferring the tensile capacity and the embedded depth in concrete of rebars in the columns 1 and 1a. Accordingly, the plate assemblies 20 and 20a and the auxiliary hardware 48 are firmly bolted together. That is, the tensile capacity of rebars in a PC column is equally transferred to a neighboring PC column and PC column connection parts are firmly coupled together using a simple bolting process as in steel-frame work.

[0064] As described above, when the columns 1 and 1a are coupled together using the plate assemblies 20 and 20a, location errors between the connection parts of the columns 1 and 1a may be easily adjusted using, for example, slot holes provided in the auxiliary hardware 48 and thus the coupling process may be conveniently performed. After the connection parts of the columns 1 and 1a are bolted together, rebars and concrete may be additionally placed to surround the connection parts.

[0065] In the present invention, for column-to-girder connection, a plate assembly 20b of the girder 1b is firmly bolted to the fixing channels 30 provided on a side surface of the column 1, using auxiliary hardware 46 such as split-Ts or angles.

[0066] The plate assembly 20b of the girder 1b is a part for equally and continuously transferring the tensile capacity and the embedded depth in concrete of rebars therein. The plate assembly 20b and the auxiliary hardware 46 such as split-Ts or angles are bolted together and the auxiliary hardware 46 is firmly bolted to the fixing channels 30 of the column 1 using the T-shaped bolts 35. Herein, lower rebars in the girder 1b may be bolted into the opening 312 of the lower fixing channel 30 of the column 1 using lower auxiliary hardware (e.g., split-T), and upper rebars in the girder 1b may be bolted into the opening 312 of the upper fixing channel 30 of the column 1 using upper auxiliary hardware (e.g., split-T).

[0067] That is, the tensile capacity of the upper and lower rebars of the girder 1b is equally transferred to the column 1 and PC connection parts are firmly coupled together using a simple bolting process.

[0068] When the girder 1b is coupled to the fixing channels 30 of the column 1, vertical location errors may be easily adjusted along the U-shaped opening 312 of the U-shaped channel 31 and thus the coupling process may be conveniently performed. In addition, horizontal location errors between the girder 1b and the column 1 may be easily adjusted using the plate assembly 20b and, for example, slot holes provided in the auxiliary hardware 46 and thus the coupling process may be conveniently performed. After the PC connection parts are bolted together, rebars and concrete may be additionally placed to surround the connection parts.

[0069] As illustrated in FIG. 4, due to the fixing channels 30 provided in the column 1, cast-in-place rebars 50 such as slab rebars may be easily fixed to the fixing channels 30 and thus the cast-in-place slab rebars may be firmly coupled to the column 1.

[0070] When the cast-in-place rebars are coupled, vertical location errors may be easily adjusted along the U-shaped opening 312 of the U-shaped channel 31 and thus the coupling process may be conveniently performed.

[0071] However, according to a conventional PC connection part coupling method, connection parts are coupled together by making through-holes in a PC column and passing slab rebars therethrough or passing and then straining strands through the column.

[0072] In addition, tolerance may not be easily achieved for location errors with respect to the through-holes in the PC member and thus constructability may be deteriorated.

[0073] FIGS. 5A, 5B, and 5C are perspective views showing other embodiments of the present invention.

[0074] The PC member having assemblable plates and fixing channels according to the present invention may be used as all of a girder or beam, a wall, and a column to which a girder is connected, according to another embodiment. FIG. 5A is a perspective view showing that the present invention is used for a girder or beam, FIG. 5B is a perspective view showing that the present invention is used for a wall, and FIG. 5C is a perspective view showing that the present invention is used for a column-girder connection structure.

[0075] In FIG. 5A, the PC member 1 having assemblable plates and fixing channels according to the present invention is used as a girder or beam. When provided in a horizontal direction and used as a girder or beam, the PC member 1 according to the present invention includes a pair of assemblable plates 20 provided at each of two ends of the girder to face each other, fixing channels 30 provided in width-direction side surfaces, and a plurality of bent rebars 15 partially embedded in and partially and perpendicularly protruding from a top surface of the PC body 10 extending in a horizontal direction.

[0076] The bent rebars 15 serve to ensure integration with a slab to be provided on the girder.

[0077] As described above, when the PC member 1 according to the present invention is used as a girder or beam, prestressed concrete may be easily obtained by applying tendons to two ends thereof to provide additional compression force, and thus a long-span girder compared to a general cast-in-place concrete girder may be formed.

[0078] FIG. 5B shows a PC wall having the assemblable plates and the fixing channels, according to the present invention. The plate assembly 20 including a pair of plates facing each other may be provided at each of left and right ends on top and bottom surfaces of the PC body extending in vertical and horizontal directions, a plurality of bent rebars 57 may be partially embedded in and partially and perpendicularly protrude from parts between the plates of the left and right ends, and two or more fixing channels 30 may be embedded at a certain interval in each of front, rear, right and left side surfaces of the PC body extending in vertical and horizontal directions. Herein, the bent rebars 57 of the top and bottom surfaces of the wall are spliced with rebars of lower and upper walls, separately from plate bolting parts.

[0079] Bent rebars may be further embedded in a horizontal direction in regions of the left and right side surfaces of the wall, where the fixing channels 30 are not embedded.

[0080] In FIG. 5B, a hollow 56 for exposing rebars of the wall may be provided by not filling a center part between the fixing channels 30 with concrete and thus cast-in-place concrete and rebars may pass therethrough.

[0081] FIG. 5C is a perspective view showing that the present invention is used for a column-girder connection structure.

[0082] As illustrated in FIG. 5C, a girder connection part 40 horizontally protruding by a certain length and made of concrete is integrally provided on a side surface of the PC body 10, and thus a girder or beam may be easily coupled thereto.

[0083] That is, when the PC member 1 having assemblable plates and fixing channels according to the present invention is used as a column, the plate assembly 20 may be provided on at least one side surface in such a manner that an end thereof is embedded in and the other end thereof protrudes from a length-direction outer end of the girder connection part 40, and thus a girder or beam may be easily coupled to the plate assembly 20 of the girder connection part 40.

[0084] The plate assembly 20 embedded in the girder connection part 40 is configured in the same manner as the plate assembly 20 embedded in the PC body 10, and thus a detailed description thereof is not provided herein.

[0085] A plurality of bent rebars 45 may be partially embedded in and partially and perpendicularly protrude from a top surface of the girder connection part 40, and thus slab concrete placed thereon may be easily integrated therewith.

[0086] That is, the girder connection part 40 horizontally protruding by a certain length is integrally provided on a side surface of the PC body 10 extending in a vertical direction and having the assemblable plates 21 and the fixing channels 30, and the plate assembly 20 is embedded in a length-direction outer end of the girder connection part 40. Additionally, A plurality of the bent rebars 15 may be partially embedded in and partially and perpendicularly protrude from a top surface of the girder connection part 40.

[0087] The above-described PC member having assemblable plates and fixing channels according to the present invention may be used as a PC column, a PC wall, and a PC girder or beam, and connection parts between the PC members may be firmly bolted together on site.

[0088] In addition, rebars of a cast-in-place member may be easily fixed through the fixing channels to a side surface of a PC body and PC members may be firmly and easily (high-tension) bolted together using the plates or the fixing channels on site. As such, difficulties and coupling reliability problems of a conventional PC member rebar coupling method (using couplers) which requires accurate coupling locations may be solved.