Construction Methods

Abstract

This invention provides a construction method that allows for the installation of permanent columns before the completion of the foundation structure, enabling the commencement of structural work on the upper floors at an earlier stage. [Solution] The construction method is a method for constructing a building structure (1) for carrying out structural work on the upper floors after the installation of the pressure-resistant slab (10) of the basement floor and before the completion of construction of the basement floor, and includes the steps of: preparing an integrated column (32) by pre-joining a temporary column (20) to be provided on the pressure-resistant slab, a steel member (24) to be joined to the upper end of the temporary column, and a permanent column (26) to be joined to the upper end of the steel member; installing the integrated column on the pressure-resistant slab; and embedding the temporary column and steel member portions of the integrated column with concrete to form a foundation (38).

Description

Technical Field

[0001] The present invention relates to a construction method of a building structure for carrying out the frame construction of an upper floor after the installation of a pressure-resistant slab of a basement floor and before the completion of the basement floor construction.

Background Art

[0002] Conventionally, in the construction of a building having multiple basement floors, without constructing temporary formwork columns, a PCa column is constructed in a self-standing state as a permanent column, and the upper basement floor of the upper part is pre-constructed as a pre-constructed floor on top of the PCa column, and then the upper floor and the lower floor are constructed simultaneously, thereby reducing temporary works and shortening the construction period (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] While shortening the construction period is desired in construction work, particularly in a building having a high-rise part and a low-rise part adjacent to the outer periphery thereof, shortening the construction period of the high-rise part with a large number of man-hours is required. For early construction of the high-rise part, it is desirable to install temporary columns or permanent PCa columns early. However, in the conventional technology as described in Patent Document 1 above, columns used for the construction of the high-rise part cannot be installed unless a foundation that requires a long time to implement is completed, so the early construction of the high-rise part has been restricted.

[0005] The present invention has been made to solve such problems, and an object of the present invention is to provide a construction method capable of installing a permanent column before the completion of the foundation structure construction and starting the frame construction of the upper floor early.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, the present invention provides a construction method for a building structure for carrying out structural work on the upper floors after the installation of the pressure-resistant slab of the basement floor but before the completion of construction of the basement floor, and includes the steps of: preparing an integrated column by pre-joining a temporary column to be placed on the pressure-resistant slab, a steel member to be joined to the upper end of the temporary column, and a permanent column to be joined to the upper end of the steel member; installing the integrated column on the pressure-resistant slab; and embedding the temporary column and steel member portions of the integrated column with concrete to form a foundation.

[0007] According to the present invention configured in this way, after the installation of the pressure-resistant slab in the basement floor but before the construction of the basement floor is completed, an integrated column, which has been pre-joined together with temporary columns and steel members, is installed on the pressure-resistant slab. Subsequently, the temporary column and steel member portions of the integrated column are embedded in concrete to form a foundation. Therefore, after the integrated column is installed on the pressure-resistant slab in the basement floor but before the foundation construction is completed, it becomes possible to start the structural work on the upper floors early using the integrated column.

[0008] In the present invention, preferably, the step of preparing pre-joined integral columns is carried out in a factory, and the invention further includes the step of transporting the integral columns from the factory to a construction site where structural work is carried out.

[0009] With the present invention configured in this way, pre-prepared integral columns can be transported to the construction site and immediately installed on the pressure-resistant plate, thereby further shortening the construction period.

[0010] In the present invention, preferably, the main column and the steel material are joined via a diaphragm.

[0011] According to the present invention configured in this manner, the presence of a diaphragm at the joint between the permanent column and the steel member improves the resistance to lateral forces (in a direction perpendicular to the longitudinal direction of the steel member and the permanent column) at the joint between the steel member and the permanent column. Furthermore, even if the thickness and shape of the steel member and the permanent column differ, they can be joined together via the diaphragm.

[0012] In the present invention, preferably, a plurality of studs are provided on the upper side surface of a temporary column.

[0013] According to the present invention configured in this way, external forces transmitted from above the temporary column can be released into the surrounding concrete via studs provided on the upper side of the temporary column.

[0014] In the present invention, preferably, the steel material has a tapered section in which the width of the steel material changes continuously between the joint with the temporary column and the joint with the permanent column, the joint with the temporary column of the steel material has approximately the same width as the temporary column, and / or the joint with the permanent column has approximately the same width as the permanent column, and in the step of embedding in concrete to form a foundation, the upper and lower ends of the tapered section are embedded in concrete.

[0015] According to the present invention configured in this manner, the width of the steel material changes continuously in the tapered section, thereby avoiding discontinuities in force transmission between permanent and temporary columns of different widths, and preventing localized stress concentration. Furthermore, since the upper and lower ends of the tapered section of the steel material are embedded in concrete, the change in force direction at the upper and lower ends of the tapered section can be contained within the concrete, preventing defects from occurring on the concrete surface. [Effects of the Invention]

[0016] According to the construction method of the present invention, permanent columns can be installed before the completion of the foundation structure, and the construction of the upper floors can be started earlier. [Brief explanation of the drawing]

[0017] [Figure 1] It is a schematic side sectional view of a building structure constructed by the building method according to an embodiment of the present invention. [Figure 2] It is a view taken along the line A-A in FIG. 1, and is a view showing the planar shape of a plate according to an embodiment of the present invention. [Figure 3] It is a view taken along the line B-B in FIG. 1, and is a view showing the planar shape of a diaphragm according to an embodiment of the present invention. [Figure 4] It is a view showing the construction procedure of the building method according to an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, a building method according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic side sectional view of a building structure constructed by the building method according to an embodiment of the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, and is a view showing the planar shape of a plate according to an embodiment of the present invention, FIG. 3 is a view taken along the line B-B in FIG. 1, and is a view showing the planar shape of a diaphragm according to an embodiment of the present invention, and FIG. 4 is a view showing the construction procedure of the building method according to an embodiment of the present invention.

[0019] The building method according to the present embodiment enables the implementation of the superstructure work of the upper floor in advance after the installation of the pressure-resistant slab and before the completion of the construction of the underground floor in the construction of a building having an underground floor and an upper floor.

[0020] [Structure of Building Structure] First, the structure of the building structure 1 of the present embodiment will be described. FIG. 1 shows a state in which the superstructure work of the upper floor can be started by the building method of the present embodiment. In the state shown in FIG. 1, the building structure 1 includes a pressure-resistant slab 10, temporary columns 20 provided on the pressure-resistant slab 10, steel materials 24, and main columns 26, and these pressure-resistant slab 10, temporary columns 20, steel materials 24, and main columns 26 form a structure for supporting the superstructure of the upper floor.

[0021] The pressure-resistant slab 10 is a plate-like member made of reinforced concrete having a predetermined thickness, and is provided, for example, above a pile not shown in the drawings. There is ground directly below the pressure-resistant slab 10, and the load of the building is transmitted to the ground through the pressure-resistant slab 10 and the pile.

[0022] The temporary column 20 is a column for temporarily supporting the permanent column 26 until the underground foundation is completed. The temporary column 20 is, for example, a cross H-shaped steel column, and a base plate 34 is welded to the lower end. Further, a plurality of studs 22 are provided on the upper side surface of the temporary column 20.

[0023] The steel material 24 is joined to the upper end of the temporary column 20. The steel material 24 is a columnar member having a cross section similar to that of a cross H-shaped steel, for example. The plate 28 is a steel plate having a thickness required in terms of calculation. The temporary column 20, the plate 28, and the steel material 24 are joined by welding, respectively. By providing the plate 28, the shear strength against the lateral force (the direction orthogonal to the longitudinal direction of the temporary column 20 and the steel material 24) is improved at the joint between the temporary column 20 and the steel material 24.

[0024] Further, the steel material 24 has a tapered portion 24A in which the width of the steel material 24 continuously changes between the joint with the temporary column 20 and the joint with the permanent column 26 described later. The joint of the steel material 24 with the temporary column 20 has substantially the same width W1 as the temporary column 20. Also, the joint of the steel material 24 with the permanent column 26 has a width W2 that is larger than the width of the temporary column 20 and substantially the same as that of the permanent column 26. That is, in the tapered portion 24A, the width of the steel material 24 continuously expands from W1 to W2. This can avoid the discontinuity in the force transmission between the permanent column 26 and the temporary column 20 having different widths and prevent the stress from concentrating locally.

[0025] The permanent column 26 is joined to the upper end of the steel member 24 via a diaphragm 30. The permanent column 26 is, for example, a prismatic member having a square cross-section. The diaphragm 30 is a steel plate of the calculated required thickness. The steel member 24, the diaphragm 30, and the permanent column 26 are joined by welding. The presence of the diaphragm 30 improves the resistance to lateral forces (in the direction perpendicular to the longitudinal direction of the steel member 24 and the permanent column 26) at the joint between the steel member 24 and the permanent column 26. Furthermore, even if the thickness and shape of the steel member 24 and the permanent column 26 are different, they can be joined to each other via the diaphragm 30.

[0026] The temporary columns 20, steel members 24, and permanent columns 26 are pre-joined together in the factory to form a single column 32, which is then transported to the construction site where the upper floor structural work will be carried out. The single column 32 is installed on top of the piles and on the pressure plate 10 using a base plate 34 and anchor bolts 36 provided at the lower end of the temporary column 20.

[0027] In the integrated column, the temporary column 20 and steel member 24 portions are embedded in concrete after the integrated column 32 is installed on the pressure plate 10, thereby forming the foundation 38 (shown by dashed lines in Figure 1). As described above, multiple studs 22 are provided on the upper side of the temporary column 20, so that external forces transmitted from above the temporary column 20 can be released into the surrounding concrete via these studs 22. In addition, since the upper and lower ends of the tapered portion 24A of the steel member 24 are embedded in concrete, the change in the direction of force at the upper and lower ends of the tapered portion 24A can be contained within the concrete, preventing defects from occurring on the surface of the concrete.

[0028] [Installation Procedure] Next, the construction procedure of the building method of this embodiment will be explained. As shown in Figure 4(a), first, in the factory, a single integrated column 32 is prepared by pre-joining a temporary column 20, a steel member 24 to be joined to the upper end of the temporary column 20, and a permanent column 26 to be joined to the upper end of the steel member 24 (Step 1).

[0029] Next, the integrated column 32 is transported from the factory to the construction site where the structural work will be carried out, and the integrated column 32 is placed on the pressure plate 10 as shown in Figure 4(b) (Step 2).

[0030] Next, as shown in Figure 4(c), the temporary column 20 and steel member 24 portions of the integrated column 32 are embedded in concrete to form the foundation 38 (Step 3). This makes it possible to start the construction of the upper floors using the integrated column 32 early, after the integrated column 32 has been installed on the pressure-resistant slab 10 of the basement floor and before the foundation construction is completed.

[0031] [Differentiation] In the embodiment described above, the temporary column 20 and steel member 24 were described as cross H-shaped steel, and the permanent column 26 was a square column, but other members of any shape, such as H-shaped steel or cylindrical columns, may also be used.

[0032] Furthermore, although the above-described embodiment explained that a single integrated column 32, which consists of a temporary column 20, steel material 24, and permanent column 26 pre-joined at a factory, is transported to the construction site where the upper floor structural work is carried out, the temporary column 20, steel material 24, and permanent column 26 may be joined sequentially at the construction site.

[0033] Next, the effects and advantages of the construction method according to this embodiment and its modifications described above will be explained.

[0034] According to the construction method of this embodiment, after the installation of the pressure-resistant slab 10 of the basement floor but before the construction of the basement floor is completed, an integrated column 32, which has a temporary column 20, steel material 24 and a permanent column 26 joined together in advance, is installed on the pressure-resistant slab 10. Then, the temporary column 20 and steel material 24 portions of the integrated column 32 are embedded in concrete to form the foundation 38. Therefore, after installing the integrated column 32 on the pressure-resistant slab 10 of the basement floor but before the construction of the foundation is completed, it becomes possible to start the structural work of the upper floors early using the integrated column 32.

[0035] Furthermore, since the pre-prepared, integrated columns 32 can be transported to the construction site and immediately installed on the pressure plate 10, the construction period can be shortened even further.

[0036] Furthermore, since the permanent column 26 and the steel member 24 are joined via the diaphragm 30, the presence of the diaphragm 30 at the joint between the permanent column 26 and the steel member 24 improves the resistance to lateral forces (in a direction perpendicular to the longitudinal direction of the steel member 24 and the permanent column 26) at the joint between the steel member 24 and the permanent column 26. In addition, even if the thickness and shape of the steel member 24 and the permanent column 26 are different, they can be joined to each other via the diaphragm 30.

[0037] Furthermore, since multiple studs 22 are provided on the upper side of the temporary column 20, external forces transmitted from above the temporary column 20 can be released into the surrounding concrete via the studs 22 provided on the upper side of the temporary column 20.

[0038] Furthermore, the steel member 24 has a tapered section 24A in which the width of the steel member 24 changes continuously between the joint with the temporary column 20 and the joint with the permanent column 26. The joint of the steel member 24 with the temporary column 20 has approximately the same width as the temporary column 20, and / or the joint with the permanent column 26 has approximately the same width as the permanent column 26. This avoids discontinuities in force transmission between the permanent column 26 and the temporary column 20, which have different widths, and prevents localized stress concentration. In addition, since the upper and lower ends of the tapered section 24A are embedded in concrete, the change in the direction of force at the upper and lower ends of the tapered section 24A can be contained within the concrete, preventing defects from occurring on the surface of the concrete. [Explanation of symbols]

[0039] 1 Architectural structure 10 Pressure-resistant plate 20 Temporary pillars 22 studs 24 Steel 24A Tapered section 26 permanent columns 28 plates 30 diaphragms 32 One Pillar 34 Base Plate 36 Anchor bolts 38 Basics

Claims

1. A method for constructing a building structure for carrying out structural work on the upper floors after the installation of the pressure-resistant slab on the basement floor and before the completion of construction on the basement floor, The steps include: preparing an integrated column by pre-joining a temporary column to be installed on the pressure plate, a steel member to be joined to the upper end of the temporary column, and a permanent column to be joined to the upper end of the steel member; The steps include: installing the integrated column on the pressure plate, A step in which the temporary column and the steel portion of the integrated column are embedded in concrete to form a foundation, A construction method that includes [this].

2. The aforementioned step of preparing pre-joined, integrated columns is carried out in the factory. The step further includes transporting the aforementioned integral column from the factory to the construction site where the structural work is to be carried out. The construction method according to claim 1.

3. The construction method according to claim 1 or 2, wherein the permanent column and the steel material are joined via a diaphragm.

4. The construction method according to claim 1 or 2, wherein a plurality of studs are provided on the upper side of the temporary column.

5. The steel material has a tapered section in which the width of the steel material changes continuously between the joint with the temporary column and the joint with the permanent column. The joint portion of the steel material with the temporary column has approximately the same width as the temporary column, and / or the joint portion with the permanent column has approximately the same width as the permanent column. In the step that is embedded in concrete to form a foundation, the upper and lower ends of the tapered portion are embedded in concrete. The construction method according to claim 1 or 2.

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