JP2587345Y2 - Pillar structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a steel framed steel column installed for a steel-framed reinforced concrete building, and in particular, casts concrete into a pile hole excavated from the ground surface. The present invention relates to an improvement of the structure of a steel-framed pillar when a steel-framed pillar is installed to support an upper structure during underground construction.

[0002]

2. Description of the Related Art When a building is formed of steel-framed reinforced concrete and is supported by a foundation pile below the basement, a steel column precedes a pillar of the basement, and this column is constructed as a straight pillar. Are known. As shown in FIG. 4, the outline of the building is a steel reinforced concrete building 1 in a basement 1a.
First, a pile hole 3 is excavated from the upper surface of the ground 2, and a cast-in-place pile 4 is formed below the basement 1a.
Is constructed, and a trussed pillar 5 is suspended from the pile 4 to be erected. The trussed pillars are made of steel, and a simple pedestal with a framed top surface is used to hold the suspended trussed pillars while relying on maintaining the verticality of the suspension of the trussed pillars themselves. hand,
Perform accurate centering on the gantry, insert the lower end into the pile 4 and install accurately. Then, pile hole 3 is crushed stone, earth and sand 2a
Backfilled with basement 6 including ground floor and beams on ground level
With this construction, while excavating the basement 1a under the support, the structures of the pillars 7 and the beams 8 can be constructed in order from the top by a so-called reverse hitting method, and during that time, they are installed as temporary structures. The load on the upper structure 1b of the building 1 is supported by the trussed pillar 5, and the construction on the ground can proceed in parallel with the underground.

[0003]

[Problems to be Solved by the Invention] However, while the vertical columns are based on the principle of verticality during suspension, displacement and bending are unavoidable when a simple gantry is used. There is a limit to the accuracy of the position, and as a result of centering, not only often a large error occurs, but also disadvantages such as contact with the reinforcing steel of the is there. In addition, if the timber pillar and the reinforcing bar are assembled and inserted together, the accuracy of the timber pillar depends on the position of the reinforcing bar, and the center of gravity of the bar itself changes.
This would impair the verticality of the suspension.

[0004] In any case, the timber pillars are connected to the above-ground structure, and while ensuring accuracy is important, they are installed as a temporary structure until the underground pillars are completed. It is desirable that it is simple,
In terms of structure, it must be rational as a member having a large axial force and a small bend, and must be rich in workability and safety.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention has been made to improve the structure of a trussed pillar in order to solve the problem. In the steel framed pillar, the pillar is composed of a steel pipe having a square cross section that is rooted in a concrete pile installed in advance in a pile hole, and concrete filled in the steel pipe, Each side of the steel pipe is provided so as to be deflected by 45 degrees with respect to the core of the general column of the structure, and, in addition, the beam of the specific structure is formed by the above structure. It discloses a connection structure.

Therefore, according to the present invention, by using a steel pipe concrete structure for the trussed pillar, the total cross-sectional area of the trussed pillar is small and the wall thickness of the steel pipe can be reduced. In addition, not only the axial deformation is reduced and the forced deformation stress of the frame is also reduced, but also the surface is smooth due to the closed section of the steel pipe,
Cleaning of adhesion of earth and sand can be facilitated. Above all, the most distinctive feature is that
This means that the trussed pillar is deflected by 45 degrees around the axis, which means that the structure of the beam to be engaged with the trussed pillar is not limited to steel structure. And, in the reinforced concrete beam, the main reinforcement has the advantage that the main reinforcement is divided horizontally at the ridge portion of the timber column and is easily and sufficiently fixed on both sides inside the column of the underground structure. . In addition, when a concrete pillar installed at a 45-degree deflection is placed in concrete foundation piles, it has greater resistance to twisting around the axis than a cross-shaped pillar, and its accuracy is maintained. I have.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings showing a preferred embodiment employing the straight pillar structure of the present invention. FIG. 1 is a horizontal sectional view of a timber column at the top of a basement structure employing the present invention, and FIG. 2 is a horizontal sectional view of a joint between a column and a beam at a position where the tall column is installed. As shown in FIG. 4, a basement 1 of a steel reinforced concrete building 1
In the part a, a straight pillar 5 is erected above a cast-in-place pile 4 constructed below a basement 1a in a pile hole 3 excavated from the ground surface, and around it, a back-casting method is used. As shown in FIG. 2, the pillar 7 of the structure in the basement 1a
And the beam 8 connected to the column 7 are constructed. Reference numeral 9 denotes concrete forming the columns 7 and the like. The reference numerals in FIG. 4 are common to the corresponding members.

[0008] According to the present invention, in order to install a pillar,
First, the pile hole 3 for the pile 4 is excavated from the ground by a known method. In deep excavation, a mud circulation method is usually adopted, and the pile hole 3 is filled with muddy water. The conventional straight pillar 5 is
Not only a circular shape but also a cross shape or an H shape is set according to the coordinate axes x and y of the column 7 that is aligned with the core of the building. It is employed by being deflected by 45 degrees with respect to the center line. The straight pillar 10 is composed of a steel pipe 11 having a square cross section and concrete 12 filled in the steel pipe 11, and each side 1 in the cross section of the steel pipe 11.
Numeral 3 is set to be deflected by 45 degrees with respect to the coordinate axes x and y of the pile 2. Reference numeral 20 denotes a steel column on the ground.

Next, FIG. 2 is a plan view of the joint between the underground pillar 7 and the beam 8 at the installation position of the straight pillar 10, and shows the crossing situation of the reinforcing bars of the beam 8. Beam reinforcement 8 in each direction
The end portion 82 where 1 is fixed to the column 7 is horizontally divided along each side 13 of the steel pipe 11 at the ridge angle 14 of the straight pillar 10 and is fixed around the adjacent ridge angle 14. . Therefore, the bending angle of the swallowing portion of the beam 8 into the column 7 in the diffusion direction is shallow, the force transmission is smooth, and the fixing portion of the beam 8 on the opposite side of the column 7 is commonly used. As a result, it is not necessary for each beam 8 to form a horizontal haunch for the column 7.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, and is a vertical cross-sectional view for explaining a connecting portion between the trussed pillar 10 and the steel column 20 above the ground. The truss pillars 10 are connected at their tops by the base 6 and connect the above-ground steel pillars 20 above the upper surface thereof. Since the above-ground steel column 20 and the trussed pillar 10 are mutually deflected by 45 degrees at the connection portion, the base plate 21 is interposed at the transition portion and connected vertically to form a fitting structure. In the present invention, a connecting steel plate 15 is provided on the top of the straight pillar 10. The connection steel plate 15 is, for example, in a bracket shape and is configured to support the lower surface of the base plate 21 vertically from the center of each side 13 of the steel pipe 11. Also, the concrete 12 inside the shaft 10 is
Through the opening 22 in the center of the base plate 21, it is connected to concrete 23 for fixing the lower end of the above-ground steel column 20. Reference numeral 24 denotes a stiffener for the pillar 20,
When the steel beam 25 of the base 6 is installed on the base 6, the transmission of the stress of the flange of the beam 25 within the cross section of the column 20 together with the base plate 21 is smoothed.

[0011]

[Operation] The operation of the straight pillar 10 constructed as described above is described. Since the concrete 12 is filled in the steel pipe 11, the concrete is made of steel frame concrete. Even if the height of the trussed pillar 10 on the basement floor is high, it does not buckle against the supporting load. Further, since the outer surface of each side 13 of the steel pipe 11 is formed smoothly, the inside of the pile hole 3 is once back-filled, and when the pillar 7 is constructed by the reverse-casting method, the steel pipe 11 is cast with respect to the concrete placement of the pillar 7. The work is easy due to the closed cross section even in the step of cleaning the surface of the device.

Next, since each side 13 in the cross section of the steel pipe 11 of the straight pillar 10 is set to be deflected by 45 degrees with respect to the coordinate axes x and y of the pillar 7 of the structure, FIG. As shown, the end portion 82 of the beam 8 at which the beam reinforcing steel 81 in each direction is fixed to the column 7 has a steel pipe 11 at the ridge angle 14 of the straight column 10.
Are fixed in a horizontal direction along each of the sides 13 and are fixed around the ridge angle 14 at the adjacent position. Therefore, beam 8 to pillar 7
The bending angle of the swallowing portion in the diffusion direction is shallow, the force transmission is smooth, and it can be shared with the fixing portion of the beam 8 on the opposite side of the column 7. There is no need to form a horizontal haunch for the column 7.

In the embodiment of the present invention, a configuration other than the above is possible. As another embodiment, the beam 8 can be precast only by projecting the end portion 82 of the beam reinforcing bar 81 outward. It is particularly significant that the difficulty of forming a horizontal haunch is eliminated. Further, when the above-mentioned steel column 20 is not a closed cross section, the top of the trussed pillar 10 is made to pass through the opening 22 of the base plate 21 and face the lower end of the above-mentioned steel column 20, and a double structure is formed by the main portions of both. Can be fixed to each other so as to form the concrete, and the structure for vertically connecting the filled concrete 12 in the trussed pillar 10 and the fixing concrete 23 at the lower end of the above-ground steel column 20 remains unchanged.

[0014]

[Effect of the Invention] The structure of the straight pillar of the present invention is a reinforced concrete underground pillar including a steel-framed straight pillar, wherein the straight pillar is a steel pipe having a square cross section which is installed in advance in a pile hole, It consists of concrete filled in steel pipes, and the angle of installation of the trussed columns is deviated by 45 degrees with respect to the core of the general columns of the structure. Due to the advantage that the installation angle of the true pillar is deflected by 45 degrees, the performance as a straight pillar is remarkably improved. In addition, the timber pillar is connected to the above-ground structure, and while securing the accuracy is important, it will be installed as a temporary structure until the underground structure is completed. Is simple, is structurally rational as a member having a large axial force and a small bending, and is rich in workability and safety.

[0015] In particular, by using a steel pipe concrete structure for the steel columns, the total cross-sectional area of the steel columns can be reduced, the wall thickness of the steel pipes can be reduced, and the axial deformation can be reduced, and the frame structure can be reduced. Not only the deformation stress is reduced, but also the surface is smooth due to the closed cross section of the steel pipe, so that the adhesion of the earth and sand can be easily cleaned. Another notable feature is that the trussed pillar is deflected by 45 degrees around the axis with respect to the normal core of the structure. However, the structure of the corresponding beam is not limited to the steel structure. In the case of the reinforced concrete beam, the main reinforcement is divided horizontally at the ridge angle of the trussed column, so that it is easily and sufficiently provided on both sides in the cross section of the column. It has the advantage of being fixed. In addition, the straight columns installed with a 45 ° deflection are more resistant to twisting around the axis than the cross-shaped straight columns in the preceding concrete foundation pile, and the accuracy is maintained. Therefore, the present invention
When constructing underground pillars including timber pillars, installation of timber pillars is carried out accurately, which greatly contributes to reduction of the cost of timber pillars themselves, and is extremely significant for the construction method of beam parts connected to pillars. It has a significant breakthrough effect.

[0016]

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a straight pillar at the top of a basement structure adopting the present invention.

FIG. 2 is a horizontal sectional view of a joint between a pillar and a beam at an installation position of a straight pillar.

FIG. 3 is a vertical sectional view taken along the line AA of FIG. 1, illustrating a connecting portion between a straight pillar and a steel column on the ground.

FIG. 4 is a vertical sectional view illustrating a conventional straight-column method.

[0017]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building 1a Basement room 1b Upper structure 2 Ground 2a Crushed stone, earth and sand, etc. 3 Piles hole 4 Piles 5 Structural pillar 6 Base 7 Pillar 8 Beam 9 Concrete 10 Structural pillar of this invention 11 Steel pipe 12 Concrete 13 Each side of steel pipe 14 Ridge angle 15 Connection steel plate 20 Ground steel column 21 Base plate 22 Opening 23 Concrete 24 Stiffener 25 Beam 81 Beam reinforcement 82 End part

Claims (3)

(57) [Scope of request for utility model registration] 1. A steel framed steel pillar included in a reinforced concrete underground pillar, wherein the steel pillar has a square cross-section steel pipe rooted in a concrete pile previously installed in a pile hole, and a steel pipe. And each side of the steel pipe is 4
A straight pillar structure characterized by being installed at a deflection of 5 degrees. 2. The beam joined to the underground pillar is made of reinforced concrete, and the reinforcing bar is divided and fixed in the cross section of the underground pillar in the horizontal direction by the ridge angle of the trussed pillar. The straight pillar structure according to claim 1. 3. The structure of a straight pillar according to claim 1, wherein a top of the straight pillar is connected to the ground pillar via a base plate of a steel frame of the ground pillar.