Method for constructing a column-beam frame and column-beam frame
By employing alternating precast column units with mechanical joints and cast-in-place sections, the method addresses the need for large cranes in precast concrete construction, achieving efficient and structurally sound column-beam frames.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TAISEI CORP
- Filing Date
- 2026-03-25
- Publication Date
- 2026-07-22
AI Technical Summary
The construction method for column-beam structures using precast concrete members requires large and special cranes due to the high weight of integrated reinforced concrete columns and beams, limiting efficient construction without such equipment.
A method involving alternating arrangements of precast column units with different heights and mechanical joints, combined with cast-in-place sections, to reduce member weight and enable construction without large cranes, utilizing mechanical joints and cast-in-place beam sections to ensure structural integrity.
Enables efficient construction of column-beam frames without requiring special lifting equipment, maintaining structural performance and efficiency through the use of mechanical joints and cast-in-place sections.
Smart Images
Figure 0007893996000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a method for constructing a column-beam structure and a column-beam structure.
Background Art
[0002] When constructing a concrete structure, the use of precast members for columns, beams, and column-beam joints may improve construction efficiency. For example, Patent Document 1 discloses a construction method for forming a building structure by combining a plurality of precast concrete members in which a reinforced concrete column, a column-beam joint, and a beam body are integrally formed. In the construction method of Patent Document 1, the beam bodies of the opposing precast members are joined on-site to construct a column-beam structure.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In the construction method of Patent Document 1, since the weight of the precast member in which the reinforced concrete column and the beam body are integrally formed is large, it is necessary to lift it using a special and large crane. An object of the present invention is to propose a method for constructing a column-beam structure and a column-beam structure that can efficiently construct a column-beam structure without requiring a special and large crane.
Means for Solving the Problems
[0005] The inventors of the present invention focused on the fact that, as a method for constructing a column-beam frame, alternating arrangements utilizing the height difference of column units and joining beam units and column units at the beam ends using a combination of mechanical and cast-in-place joining methods can simultaneously achieve rationalized construction and ensure structural performance, leading to the present invention. The present invention provides a method for constructing a column-beam frame to solve the aforementioned problems, comprising: a first step of arranging two types of precast column units having different height divisions, a first precast column unit having two integrated upper and lower column-beam joints and a second precast column unit having one integrated column-beam joint, alternately in the horizontal direction; a second step of horizontally moving a precast beam unit with a mechanical joint element embedded in it to the beam-connecting reinforcing bars protruding from the side surface of the lower column-beam joint of the first precast column unit, and mechanically joining the beam-connecting reinforcing bars by inserting them into the mechanical joint element; a third step of in-situ pouring concrete between the column-beam joint of the second precast column unit and the precast beam unit to form an in-situ poured beam section, and joining the second precast column unit and the precast beam unit; and a fourth step of joining another first precast column unit to the upper end of the second precast column unit, and further joining another second precast column unit to the upper end of the first precast column unit. Preferably, the precast beam unit has the mechanical joint element embedded in one beam end, and an extension portion that forms the bottom and side surfaces of the cast-in-place beam section is integrally extended from the other beam end. Furthermore, the column-beam frame of the present invention comprises a first precast column unit having two upper and lower column-beam joints integrally, a second precast column unit having one column-beam joint integrally, and a precast beam unit horizontally mounted between the first and second precast column units. A mechanical joint element into which a beam-connecting reinforcing bar protruding from the side surface of the lower column-beam joint of the first precast column unit can be inserted is embedded at one end of the precast beam unit, and a cast-in-place beam section formed by in-situ concrete pouring is formed between the other end of the precast beam unit and the second precast column unit. According to the column-beam frame construction method and column-beam frame of the present invention, since the precast column unit and precast beam unit are separated, the weight of each precast member is reduced, and construction is possible without the use of special and large lifting equipment. Furthermore, by using mechanical joints and cast-in-place sections in combination, both constructability and structural safety can be achieved. [Effects of the Invention]
[0006] According to the method and method for constructing a column-beam frame of the present invention, it is possible to efficiently construct a column-beam frame without requiring special and large lifting equipment. [Brief explanation of the drawing]
[0007] [Figure 1] This is a front view showing an example of a column-beam frame structure according to the embodiment. [Figure 2] (a) is a perspective view showing the first precast column unit, (b) is a perspective view showing the second precast column unit, and (c) is a perspective view showing the precast beam unit. [Figure 3] This is a flowchart showing the procedure for constructing a column-beam frame according to the embodiment. [Figure 4] This is a front view showing the first column placement process. [Figure 5] This is a front view showing the first beam joining process. [Figure 6] This is a front view showing the second beam joining process. [Figure 7] This is a front view showing the second column placement process. [Figure 8] This is a front view showing the third beam joining process. [Figure 9] This is a front view showing the fourth beam joining process. [Figure 10] This is a front view showing the fifth beam joining process. [Figure 11] This is a front view showing the sixth beam joining process. [Modes for carrying out the invention]
[0008] This invention relates to a method for constructing a column-beam frame and its structure, which combines column and beam units of different heights and utilizes both mechanical joints and cast-in-place sections. According to this invention, it is possible to reduce the weight of the members while ensuring structural performance and improving construction efficiency. This embodiment describes a method for constructing a column-beam frame, which forms the structural body (column-beam frame) of a building by combining precast concrete column members and beam members. Figure 1 shows the column-beam frame 1 of this embodiment. As shown in Figure 1, the column-beam frame 1 of this embodiment comprises two types of precast column units (first precast column unit 2 and second precast column unit 3) having different height divisions, a precast beam unit 4, and a cast-in-place beam section 5.
[0009] Figure 2(a) shows the first precast column unit 2. As shown in Figures 1 and 2(a), the first precast column unit 2 is a precast concrete member that integrally has two upper and lower column-beam joints (upper column-beam joint 21 and lower column-beam joint 22). In other words, the first precast column unit 2 is a column member formed by integrally including at least two layers of column-beam joints. Multiple beam-connecting reinforcing bars 23 used for joining with the precast beam unit 4 protrude laterally (in a direction perpendicular to the axial direction) from the sides of the upper column-beam joint (upper column-beam joint) 21 and the lower column-beam joint (lower column-beam joint) 22 of the first precast column unit 2. At the upper end of the first precast column unit 2, multiple reinforcing bars 24 for connecting the column, used for joining it to other precast column units (second precast column unit 3), protrude upward (axially). A mechanical joint element 25 into which reinforcing bars 24 and 33 for column connection can be inserted is embedded at the lower end of the first precast column unit 2. The mechanical joint element 25 is, for example, a sleeve (cylindrical member) for mechanical joints.
[0010] Figure 2(b) shows the second precast column unit 3. As shown in FIGS. 1 and 2(b), the second precast column unit 3 is a precast concrete member integrally having a single-story column-beam joint 31. That is, the second precast column unit 3 is a column member integrally formed including column-beam joints for a smaller number of floors than the first precast column unit 2. On the side surface of the column-beam joint 31, beam connection reinforcing bars 32 project horizontally (in a direction orthogonal to the axial direction). At the upper end of the second precast column unit 3, column connection reinforcing bars 33 for joining with other precast column units (the first precast column unit 2) project upward (in the axial direction). At the lower end of the second precast column unit 3, a mechanical joint element 34 into which the column connection reinforcing bars 24, 33 can be inserted is embedded. The mechanical joint element 34 is, for example, a sleeve (cylindrical member) for a mechanical joint.
[0011] Figure 2(c) shows the precast beam unit 4. As shown in FIGS. 1 and 2(c), the precast beam unit 4 is a precast concrete member laid horizontally across the first precast column unit 2 and the second precast column unit 3. At one end of the precast beam unit 4, a mechanical joint element 41 into which the beam connection reinforcing bars 23, 32 can be inserted is embedded. The mechanical joint element 41 is, for example, a sleeve (cylindrical member) for a mechanical joint. At the other end of the precast beam unit 4, beam connection reinforcing bars 42 project in the axial direction. At the other beam end of the precast beam unit 4, an extension part 43 is integrally formed. The extension part 43 extends laterally from the main body part of the precast beam unit 4. The extension part 43 of the present embodiment has an L-shaped cross-section formed by a bottom plate part 44 covering the lower side (the bottom surface of the cast-in-place beam part 5) of the beam connection reinforcing bars 42 and a side plate part 45 covering the side (the side surface of the cast-in-place beam part 5) of the beam connection reinforcing bars 42.
[0012] The in-situ cast beam part 5 joins the other end of the precast beam unit 4 and the first precast column unit 2 or the second precast column unit 3. The in-situ cast beam part 5 is formed by casting concrete in-situ between the other end of the precast beam unit 4 and the first precast column unit 2 or the second precast column unit 3 (the part surrounded by the extension part 43).
[0013] Hereinafter, the construction method of the column-beam structure of this embodiment will be described. Fig. 3 shows the procedure of the construction method of the column-beam structure. As shown in Fig. 3, the construction method of the column-beam structure includes a first column placement step S1, a first beam joining step S2, a second beam joining step S3, a second column placement step S4, a third beam joining step S5, a fourth beam joining step S6, a fifth beam joining step S7, and a sixth beam joining step S8.
[0014] Fig. 4 shows the first column placement step S1. In the first column placement step S1, as shown in Fig. 4, the first precast column units 2 and the second precast column units 3 are arranged alternately in the horizontal direction. Column connecting reinforcing bars 61 are provided protruding in advance at the installation locations of the first precast column units 2 (the floor surface 6 in this embodiment). The first precast column unit 2 is erected with the column connecting reinforcing bars 61 inserted into the mechanical joint elements 25. Similarly, column connecting reinforcing bars 61 are also provided protruding in advance at the installation locations of the second precast column units 3 (the floor surface 6 in this embodiment). The second precast column unit 3 is erected with the column connecting reinforcing bars 61 inserted into the mechanical joint elements 34.
[0015] Figure 5 shows the first beam joining process S2 and the second beam joining process S3. In the first beam joining process S2, as shown in Figure 5, the precast beam unit 4 is joined to the first precast column unit 2. In the first beam joining process S2, first, the precast beam unit 4, which is suspended by a lifting machine (not shown), is placed to the side of the lower column-beam joint 22 of the first precast column unit 2. At this time, the precast beam unit 4 is positioned at an angle in plan view with respect to the axis when the installation is complete, so that the beam connecting reinforcing bars 23 and the extension portion 43 do not come into contact. Next, the precast beam unit 4 is moved horizontally, and the beam connecting reinforcing bars 23 protruding from the side of the lower column-beam joint 22 are inserted into the mechanical joint element 41, thereby mechanically joining the first precast column unit 2 and the precast beam unit 4. Simultaneously, the precast beam unit 4 is rotated using one end as a pivot point, so that the precast beam unit 4 is positioned between the first precast column unit 2 and the second precast column unit 3.
[0016] Figure 6 shows the second beam joining process S3. In the second beam joining process S3, as shown in Figure 6, the second precast column unit 3 and the precast beam unit 4 are joined. In the second beam joining process S3, concrete 51 is poured in place between the column-beam joint portion 31 of the second precast column unit 3 and the precast beam unit 4 (the space surrounded by the column-beam joint portion 31, the bottom plate portion 44, the side plate portion 45, and the other end face of the precast beam unit 4) to form the cast-in-place beam portion 5. The concrete 51 is poured after a formwork (not shown) is installed on the side of the extension portion 43, incorporating the beam connection reinforcing bars 32 protruding from the side of the column-beam joint portion 31 of the second precast column unit 3 and the beam connection reinforcing bars 42 protruding from the other end face of the precast beam unit 4. Furthermore, the beam connection reinforcement bars 32 of the second precast column unit 3 and the beam connection reinforcement bars 42 of the precast beam unit 4 are joined by lap splices or mechanical splices as necessary.
[0017] Figure 7 shows the second column placement process S4. In the second column placement process S4, as shown in Figure 7, another first precast column unit 20 is joined to the upper end of the second precast column unit 3, and another second precast column unit 30 is joined to the upper end of the first precast column unit 2. The first precast column unit 20 is erected with the column connection reinforcing bars 33 of the second precast column unit 3 inserted into the mechanical joint element 25. Similarly, the second precast column unit 30 is erected with the column connection reinforcing bars 24 of the first precast column unit 2 inserted into the mechanical joint element 34.
[0018] Figure 8 shows the third beam joining process S5. In the third beam joining process S5, as shown in Figure 8, the precast beam unit 4 is joined to another first precast column unit 20. In the third beam joining process S5, first, the precast beam unit 4, which is suspended by a lifting machine (not shown), is placed to the side of the lower column-beam joint 22 of the first precast column unit 20. At this time, the precast beam unit 4 is positioned at an angle in plan view with respect to the axis when the installation is complete, so that the beam connecting reinforcement 23 and the extended portion 43 do not come into contact. Next, the precast beam unit 4 is moved horizontally, and the beam connecting reinforcement 23 protruding from the side of the lower column-beam joint 22 is inserted into the mechanical joint element 41, and the first precast column unit 20 and the precast beam unit 4 are mechanically joined. Simultaneously, the precast beam unit 4 is rotated using one end of the precast beam unit 4 as a pivot point, so that the precast beam unit 4 is positioned between the first precast column unit 20 and the first precast column unit 2.
[0019] Figure 9 shows the fourth beam joining process S6. In the fourth beam joining process S6, as shown in Figure 9, the first precast column unit 2 and the precast beam unit 4 are joined. In the fourth beam joining process S6, concrete 51 is poured in place between the upper column-beam joint 21 of the first precast column unit 2 and the precast beam unit 4 (the space surrounded by the column-beam joint 21, the bottom plate 44, the side plate 45, and the other end face of the precast beam unit 4) to form the cast-in-place beam section 5. The concrete 51 is poured after a formwork (not shown) is installed on the side of the extension section 43, incorporating the beam connection reinforcing bars 23 protruding from the side of the upper column-beam joint 21 of the first precast column unit 2 and the beam connection reinforcing bars 42 protruding from the other end face of the precast beam unit 4.
[0020] Figure 10 shows the fifth beam joining process S7. As shown in Figure 10, in the fifth beam joining process S7, the precast beam unit 4 is joined to another second precast column unit 30. In the fifth beam joining process S7, first, the precast beam unit 4, which is suspended by a lifting machine (not shown), is placed to the side of the column-beam joint 31 of the second precast column unit 30. At this time, the precast beam unit 4 is tilted so that the beam connecting reinforcement 32 and the extension 43 do not come into contact. Next, the precast beam unit 4 is moved horizontally, and the beam connecting reinforcement 32 protruding from the side of the column-beam joint 31 is inserted into the mechanical joint element 41, mechanically joining the second precast column unit 30 and the precast beam unit 4. At the same time, the precast beam unit 4 is rotated using one end of the precast beam unit 4 as a pivot point, and the precast beam unit 4 is placed between the first precast column unit 20 and the second precast column unit 30.
[0021] Figure 11 shows the sixth beam joining process S8. In the sixth beam joining process S8, the other first precast column unit 20 is joined to the precast beam unit 4. In the sixth beam joining process S8, concrete 51 is cast in place in the space between the upper column-beam joint 21 of the first precast column unit 20 and the precast beam unit 4 (the space surrounded by the column-beam joint 21, the bottom plate 44, the side plate 45, and the other end face of the precast beam unit 4) to form the cast-in-place beam section 5. The concrete 51 is cast in a state where it is wrapped around the beam connection reinforcing bars 23 protruding from the side of the upper column-beam joint 21 of the first precast column unit 20 and the beam connection reinforcing bars 42 protruding from the other end face of the precast beam unit 4, after a formwork (not shown) is installed on the side of the extension section 43. The process from the first column placement process S1 to the sixth beam joining process S8 is repeated to construct a structure of a predetermined height.
[0022] According to the column-beam frame construction method and column-beam frame 1 of this embodiment, the weight of each precast member is reduced because it is divided into precast column units and precast beam units 4. As a result, construction is possible without the use of special and large lifting equipment. Furthermore, the hybrid joint structure, which combines mechanical joints and cast-in-place sections, makes it possible to achieve both construction efficiency and structural performance.
[0023] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and each of the above-mentioned components can be modified as appropriate without departing from the spirit of the present invention. In the above embodiment, the case in which an extension portion 43 is formed at the end of the precast beam unit 4 was described, but the extension portion 43 may be formed as needed. If the precast beam unit 4 does not have an extension portion 43 at its end, it is not necessary to position the precast beam unit 4 at an angle in plan view between the precast column units in the first beam joining process S2, the third beam joining process S5, and the fifth beam joining process S7. Furthermore, the extended portion 43 is not limited to having an L-shape in cross-section with a bottom plate portion 44 and side plate portions 45, but may also be formed in a concave shape in cross-section with a bottom plate portion 44 and a pair of side plate portions 45. As described above, the extension section 43 can also function as formwork for the cast-in-place beam section 5, which simplifies the construction process and ensures uniform quality.
[0024] In the above embodiment, in the second column placement step S4, another first precast column unit 20 is joined to the upper end of the second precast column unit 3, and another second precast column unit 30 is joined to the upper end of the first precast column unit 2. However, the precast column units joined to the upper ends of the second precast column unit 3 and the first precast column unit 2 are not limited. For example, in the second column placement step S4, another second precast column unit 3 may be joined only to the upper end of the second precast column unit 3. In this case, the third beam joining step S5 and the fourth beam joining step S6 are omitted. Also, in the second column placement step S4, another first precast column unit 20 may be joined to both the upper end of the first precast column unit 2 and the upper end of the second precast column unit 3. [Explanation of symbols]
[0025] 1 Column beam frame 2. First precast column unit 21 Upper column-beam joint (upper column-beam joint) 22 Lower column-beam joint (lower column-beam joint) 23 Reinforcement bars for beam connections 24 Reinforcement bars for connecting columns 25 Mechanical coupling elements 3. Second precast column unit 31 Column beam joint 32 Reinforcement bars for beam connections 33 Reinforcement bars for connecting columns 34 Mechanical coupling elements 4. Precast beam unit 41 Mechanical coupling elements 42 Reinforcement bars for beam connections 43 Extension part 44. Base plate section 45 Side panel section 5. On-site beam construction 51 コンクリート S1 First Column Configuration Project (First Project) S2 First Beam Joint Project (Second Project) S3 Second Beam Joint Project (Third Project) S4 Second Column Configuration Project (Fourth Project)
Claims
1. A method for constructing a column-beam frame for building, The first step involves arranging two types of precast column units having different height classifications, namely a first precast column unit having two integrated upper and lower column-beam joints and a second precast column unit having one integrated column-beam joint, alternately in the horizontal direction. A second step involves horizontally moving a precast beam unit with a mechanical joint element embedded in it to the beam connecting reinforcing bars protruding from the side of the column-beam joint of the lower section of the first precast column unit, and mechanically joining the beam connecting reinforcing bars by inserting them into the mechanical joint element. A third step involves casting concrete in-situ between the column-beam joint of the second precast column unit and the precast beam unit to form a cast-in-situ beam section, thereby joining the second precast column unit and the precast beam unit. A method for constructing a column-beam frame, comprising a fourth step of joining another first or second precast column unit to the upper end of the second precast column unit.
2. The method for constructing a column-beam frame according to claim 1, characterized in that the precast beam unit has the mechanical joint element embedded in one beam end and an extension portion that forms the bottom and side surfaces of the cast-in-place beam portion integrally extended from the other beam end.
3. A first precast column unit having two integrated column-beam joints, A second precast column unit having a single-stage column-beam joint, A column-beam frame comprising the first precast column unit and a precast beam unit horizontally mounted on the second precast column unit, A mechanical joint element is embedded in one end of the precast beam unit, into which a beam connecting reinforcing bar protruding from the side of the column-beam joint of the lower section of the first precast column unit can be inserted. A column-beam frame characterized in that a cast-in-place beam section is formed between the other end of the precast beam unit and the second precast column unit by casting concrete in place.