Constructing a column
The false column's stepped design ensures complete concrete filling and easy assembly by discharging stabilizing fluid outward, addressing construction challenges and enhancing filling rates and constructability.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- SHIMIZU CORP
- Filing Date
- 2022-08-22
- Publication Date
- 2026-05-11
AI Technical Summary
Existing methods for constructing false columns face challenges in managing concrete filling rates without visual confirmation, and changing the shape of the column is difficult due to construction period constraints.
A false column design featuring a cylindrical portion with a stepped section that tapers downwards, allowing concrete to fill from the bottom while stabilizing fluid is discharged diagonally outward, ensuring complete filling and improved constructability through precast concrete and grout-filled connections.
The design enhances concrete filling rates by preventing stabilizing fluid retention and facilitates easy assembly, improving constructability and structural integrity.
Smart Images
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Abstract
Description
Technical Field
[0003]
[0001] The present invention relates to a false column.
Background Art
[0002] Conventionally, in the construction of a false column as shown in Patent Document 1 below, when placing pile concrete after steel pipe construction, flow concrete was used to improve the concrete filling rate at the bottom. It is desired to manage the concrete filling rate without visual confirmation.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] However, since it is difficult to reproduce the in-situ state during actual construction, a reproduction test cannot be performed, or even when a reproduction test is performed and the shape of the false column needs to be changed, it is difficult in terms of time due to the relationship with the construction period.
[0005] [[ID=第39]]Therefore, the present invention has been made in view of the above circumstances, and provides a false column capable of improving the concrete filling rate.
Means for Solving the Problems
[0006] To achieve the above object, the present invention employs the following means. That is, the false column according to the present invention includes a cylindrical portion having a cylindrical shape, and a stepped portion provided on one side in the axial direction of the cylindrical portion and formed in a stepped shape so as to gradually taper toward one side in the axial direction.
[0007] In this type of structural column, the stepped section of the column is facing downwards and placed in a pile hole filled with stabilizing fluid. When concrete, which will become the pile concrete, is poured into the pile hole, the concrete fills the hole from the bottom. As the concrete is replaced, the stabilizing fluid is discharged from a discharge pipe inserted into the top of the stabilizing fluid. At this time, the top surface of the concrete gradually rises, and when it reaches the bottom of the stepped section, the stabilizing fluid is discharged along the bottom surface of the stepped section in a flow that is diagonally upward from the axis, while the top surface of the concrete rises. If the underside of the structural column is flat, there is a possibility that the stabilizing fluid may become trapped between the filled concrete and the flat underside of the structural column. However, in the structural column described above, the underside of the stepped section is higher towards the outer periphery, so the stabilizing fluid can be reliably discharged to the outer periphery. Therefore, concrete can be filled without any stabilizing fluid remaining in the pile hole, improving the concrete filling rate.
[0008] Furthermore, in the structural column according to the present invention, the stepped portion may be formed of precast concrete.
[0009] In this type of structural column, the stepped section is made of precast concrete. Therefore, the constructability of the structural column can be improved.
[0010] Furthermore, the structural column according to the present invention may include a bottom portion provided at one end of the cylindrical portion in the axial direction, and a connecting portion in which grout material is filled between the stepped portion and the bottom portion.
[0011] If the surface accuracy of the bottom surface and the top surface of the stepped section are not good, a gap may form between the bottom surface and the top surface of the stepped section if they are joined directly. In the structural column described above, the bottom and the stepped section can be connected with a grout-filled connection without creating a gap between the bottom surface and the top surface of the stepped section.
[0012] Furthermore, in the structural column according to the present invention, a first connecting plate portion is provided on the outer surface of the cylindrical portion, and a second connecting plate portion is provided on the outer surface of the stepped portion, and the first connecting plate portion and the second connecting plate portion may be bolted together via a splice plate.
[0013] In this structural column, the first connecting plate section provided on the cylindrical section and the second connecting plate section provided on the stepped section are bolted together via a splice plate. Therefore, the cylindrical section and the stepped section can be easily joined together. [Effects of the Invention]
[0014] According to the structural column of the present invention, the concrete filling rate can be improved. [Brief explanation of the drawing]
[0015] [Figure 1] This is a front view showing the lower part of a structural column in one embodiment of the present invention. [Figure 2] This is a bottom view showing the lower part of a structural column in one embodiment of the present invention. [Figure 3] This diagram illustrates a construction method for a structural column according to one embodiment of the present invention. [Figure 4] This diagram illustrates the effects of a structural column in one embodiment of the present invention. [Modes for carrying out the invention]
[0016] A structural column relating to one embodiment of the present invention will be explained using drawings. The structural column according to this embodiment is used, for example, in the top-down construction method. The top-down construction method is a construction method in which the underground and above-ground floors are constructed simultaneously.
[0017] Figure 1 is a front view showing the lower part of a structural column according to one embodiment of the present invention. As shown in FIG. 1, the lower part of the structural true column 1 is arranged in a pile hole 11 (see FIG. 4). The structural true column 1 includes a steel pipe 2, a stepped member (stepped part) 3, and a connecting part 4. In the following description, based on the state where the axial direction (the direction indicated by the dashed-dotted line O in the figure) of the steel pipe part (tubular part) 21 of the steel pipe 2 faces the vertical direction and the bottom plate part 22 is arranged at the lower part of the steel pipe part 21, the description will be made.
[0018] The steel pipe 2 has a steel pipe part 21 and a bottom plate part (bottom) 22. The steel pipe part 21 is formed in a square tubular shape. In the state where the lower part of the structural true column 1 is installed in the pile hole 11, the axial direction of the steel pipe part 21 faces the vertical direction. Note that the shape of the steel pipe part 21 may be cylindrical.
[0019] On each of the four outer surfaces 21a of the steel pipe part 21, an erection piece (first joint plate part) 24 that projects laterally is provided. The erection piece 24 projects in a direction orthogonal to each outer surface 21a. The erection piece 24 is joined to the outer surface 21a of the steel pipe part 21 by welding or the like. Note that the outer surface 21a of the steel pipe part 21 is the surface facing the outside, which is opposite to the inside of the steel pipe part 21.
[0020] The bottom plate part 22 is provided at the lower end part (one end part in the axial direction) of the steel pipe part 21. The bottom plate part 22 is rectangular in plan view. The edge part 22a of the bottom plate part 22 projects to the outer peripheral side more than the steel pipe part 21.
[0021] The stepped member 3 is arranged with a gap S below the bottom plate part 22 of the steel pipe 2. The stepped member 3 is formed of precast concrete.
[0022] The lower surface of the stepped member 3 is formed in a stepped shape so as to gradually taper downward. In the present embodiment, the stepped member 3 has four stepped parts 31 to 34. Note that the number of stepped parts of the stepped member 3 can be set as appropriate.
[0023] FIG. 2 is a bottom view showing the lower part of the structural true column 1. The stepped sections 31 to 34 are arranged in the order from top to bottom. The stepped sections 31 to 34 are arranged coaxially with the steel pipe section 21. The stepped sections 31 to 34 are roughly rectangular parallelepipeds. As shown in Figure 2, when viewed from below, the base area of stepped section 32 is smaller than the base area of stepped section 31. The base area of stepped section 33 is smaller than the base area of stepped section 32. The base area of stepped section 34 is smaller than the base area of stepped section 33.
[0024] The lower surfaces 31d of the stepped portion 31, 32d of the stepped portion 32, 33d of the stepped portion 33, and 34d of the stepped portion 34 are slightly inclined with respect to the horizontal plane. The angle of inclination of the lower surfaces 31d of the stepped portion 31, 32d of the stepped portion 32, 33d of the stepped portion 33, and 34d of the stepped portion 34 with respect to the horizontal plane is approximately 3° or less. However, the lower surfaces 31d of the stepped portion 31, 32d of the stepped portion 32, 33d of the stepped portion 33, and 34d of the stepped portion 34 may also be aligned with the horizontal plane.
[0025] Each of the four outer surfaces 31a of the stepped portion 31 is provided with a connecting fitting 36. The connecting fitting 36 has a fixed plate portion 36a and an extended plate portion (second connecting plate portion) 36b. Note that the outer surface 31a of the stepped portion 31 is the surface facing outwards, opposite to the inside of the stepped portion 31.
[0026] The fixing plate portion 36a is positioned along the outer surface 31a of the stepped portion 31. A bolt 37a is inserted through a mounting hole in the fixing plate portion 36a and fastened to an insert nut 37b embedded in the stepped portion 31. The extension plate portion 36b protrudes in a direction perpendicular to the outer surface 31a of the stepped portion 31.
[0027] As shown in Figure 1, the erection piece 24 and the extension plate portion 36b are bolted together via a splice plate 38. The splice plate 38 is positioned to straddle both the erection piece 24 and the extension plate portion 36b. The splice plate 38 is positioned on both sides of the erection piece 24 and the extension plate portion 36b. A bolt 38a is inserted through the mounting hole of the splice plate 38 and the mounting hole of the erection piece 24 and fastened to a nut 38b. A bolt 38c is inserted through the mounting hole of the splice plate 38 and the mounting hole of the extension plate portion 36b and fastened to a nut 38d.
[0028] As shown in Figure 2, one outer surface 31a of the stepped portion 31 is provided with an insert nut 39 embedded inside that opens outward. The lower surface 32d of the stepped portion 32 is provided with an insert nut 39 embedded inside that opens outward. One outer surface 34a of the stepped portion 34 is provided with an insert nut 39 embedded inside that opens outward.
[0029] As shown in Figure 1, the connecting portion 4 is made of grout material filled between the bottom plate portion 22 of the steel pipe 2 and the stepped portion 31 of the stepped member 3. The bottom plate portion 22 of the steel pipe 2 and the stepped portion 31 of the stepped member 3 are connected via the connecting portion 4. The grout material is, for example, a non-shrinking grout agent with strength equivalent to that of pile concrete.
[0030] Next, we will explain the construction method for the structural column 1 described above. Figure 3 is a diagram illustrating the construction method of structural column 1. As shown in Figure 3, the steel pipe 2 is positioned on work surface A so that its axis is horizontal.
[0031] Next, the connecting hardware 36 is fixed to the four outer surfaces 31a of the step portion 31 of the staircase member 3. The bolts 37a are inserted through the mounting holes in the fixing plate portion 36a of the connecting hardware 36 and fastened to the insert nuts 37b of the step portion 31 of the staircase member 3.
[0032] Next, an eyebolt (not shown) is attached to the insert nut 39 of the stepped member 3 and the member is lifted. The stepped member 3 is positioned so that a gap S is secured between the stepped portion 31 of the stepped member 3 and the bottom plate portion 22 of the steel pipe 2, where the connecting portion 4 to be constructed in a later step will be formed.
[0033] Next, the splice plate 38 is placed between the erection piece 24 provided on the steel pipe 2 and the extension plate portion 36b of the connecting hardware 36 fixed to the stepped member 3. Bolt 38a is inserted through the mounting hole of the splice plate 38 and the mounting hole of the erection piece 24 and fastened with nut 38b. Bolt 38c is inserted through the mounting hole of the splice plate 38 and the mounting hole of the extension plate portion 36b and fastened with nut 38d.
[0034] Next, the formwork 51 is positioned on three sides: below and on both sides of the gap S between the steel pipe 2 and the stepped member 3. Grout material is poured in from the upper gap S. Once the grout material hardens, the connection part 4 is formed.
[0035] Figure 4 illustrates the effects of the structural columns. As shown in Figure 4, after the grout has hardened, the formwork 51 is removed and the structural column 1 is installed in the pile hole 11. At this time, concrete is filled in advance into the lower part of the steel pipe 2. The pile hole 11 is filled with stabilizing fluid W. Because the weight of the structural column 1 has increased by the weight of the concrete that was filled in advance into the lower part of the steel pipe 2, the stabilizing fluid W cancels out the effect of buoyancy acting on the structural column 1, allowing the structural column 1 to be erected.
[0036] An injection pipe 13 is inserted into the pile hole 11, and concrete C, which will later become the pile concrete, is poured from the tip of the injection pipe 13. At the top of the pile hole 11, a discharge pipe (not shown) is inserted above the stabilizing fluid W. As the poured concrete C fills the pile hole 11 from the bottom 11d, the stabilizing fluid 12 is discharged from the discharge pipe, replacing the concrete C. At this time, the upper surface Cu of the concrete C gradually rises, and when it reaches the lower surface (bottommost surface) 34d of the stepped member 3, the stabilizing fluid W is discharged in a diagonally upward flow (see arrow) along the lower surfaces 34d, 33d, 32d, 31d of the stepped member 3, while the upper surface Cu of the concrete C rises. Therefore, concrete C can be filled into the pile hole 11 without any stabilizing fluid W remaining.
[0037] In the structural column 1 configured in this way, the stepped member 3 of the structural column 1 is placed facing downwards in a pile hole 11 filled with stabilizing fluid W. When concrete C, which will become the pile concrete, is poured into the pile hole 11, the concrete C fills the pile hole 11 from the bottom 11d. As the concrete C is replaced, the stabilizing fluid W is discharged from a discharge pipe inserted into the top of the stabilizing fluid W. At this time, the upper surface Cu of the concrete C gradually rises and reaches the lower surface (bottommost surface) 34d of the stepped portion 34 of the stepped member 3. At this time, the stabilizing fluid W is discharged along the lower surfaces 34d, 33d, 32d, 31d of the stepped member 3 in a flow that is diagonally upward from the axis, while the upper surface Cu of the concrete C rises. If the lower surface of the structural column is flat, there is a possibility that the stabilizing fluid W may be trapped between the filled concrete C and the flat lower surface of the structural column. However, in the structural column 1 described above, the lower surfaces 34d, 33d, 32d, and 31d of the stepped member 3 are higher towards the outer periphery, so the stabilizing fluid W can be reliably discharged to the outer periphery. Therefore, concrete C can be filled into the pile hole 11 without any stabilizing fluid W remaining, thereby improving the filling rate of concrete C.
[0038] Furthermore, the stepped member 3 is made of precast concrete. Therefore, the constructability of the structural column 1 can be improved.
[0039] Furthermore, if the surface accuracy of the lower surface of the bottom plate portion 22 of the steel pipe 2 and the surface accuracy of the upper surface of the stepped member 3 are not good, a gap may be created between the lower surface of the bottom plate portion 22 and the upper surface of the stepped member 3 if they are directly joined. In the structural column 1 described above, the steel pipe 2 and the stepped member 3 can be connected by a connection portion 4 filled with grout material without creating a gap between the lower surface of the bottom plate portion 22 and the upper surface of the stepped member 3.
[0040] Furthermore, the erection piece 24 provided on the steel pipe section 21 and the extended plate section 36b of the connecting hardware 36 provided on the stepped member 3 are bolted together via a splice plate 38. Therefore, the steel pipe 2 and the stepped member 3 can be easily joined together.
[0041] Furthermore, the lower surfaces 34d, 33d, 32d, and 31d of the stepped member 3 are only slightly inclined from the horizontal plane. Therefore, the vertical axial force generated in the structural column 1 can be reliably transmitted to the pile concrete.
[0042] Furthermore, the stepped member 3 and the bottom plate portion 22 provided on the steel pipe portion 21 are connected by a connecting portion 4 filled with grout material. Therefore, the stepped member 3 and the steel pipe 2 can be securely integrated.
[0043] It should be noted that the assembly procedure, or the various shapes and combinations of each component shown in the above-described embodiment, are merely examples and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.
[0044] For example, in the embodiment shown above, a steel pipe 2 made of steel and a stepped member 3 made of precast concrete are joined together, but the present invention is not limited to this. The cylindrical portion and the stepped portion may be formed integrally.
[0045] The bottom plate portion 22 of the steel pipe 2 and the step portion 31 of the stepped member 3 are connected via a connecting portion 4. Furthermore, the erection piece 24 of the steel pipe 2 and the connecting hardware 36 of the stepped member 3 are bolted together via a splice plate 38. The present invention is not limited to this. The method of joining the steel pipe 2 and the stepped member 3 can be set as appropriate. [Explanation of symbols]
[0046] 1 Structure Pillar 3 Stair-like part (step-like part) 4 Connection part 21 Steel pipe section (cylindrical section) 21a Exterior 22 Bottom plate (bottom) 24 Erection piece (first joint plate section) 36b Extended plate section (second joint plate section) 38 Splice Plates O axis
Claims
1. A cylindrical part, A structural column comprising: a stepped portion provided on one side of the cylindrical portion in the axial direction, and formed in a stepped manner so as to gradually taper toward the one side in the axial direction.
2. The structural column according to claim 1, wherein the stepped portion is formed of precast concrete.
3. The bottom portion provided at one end of the cylindrical portion in the axial direction, A structural column according to claim 1 or 2, comprising a connecting portion in which grout material is filled between the stepped portion and the bottom portion.
4. A first joining plate portion is provided on the outer surface of the cylindrical portion. A second joining plate portion is provided on the outer surface of the aforementioned stepped portion. The structural column according to claim 1 or 2, wherein the first joining plate portion and the second joining plate portion are bolted together via a splice plate.