JP2006057371A - Rc structural body and axial power transmission structure of permanent substructural column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the axial force transmission structure of a RC structural body and a permanent sub-substructural column having no fear of breakage due to bearing force in the axial force transmission zone for supporting the axial force of a RC structural body by transmission the same to the permanent sub-substructural column present below the same. <P>SOLUTION: The axial force transmission structure of the inventional RC structural body and the permanent sub-substructural column join the RC structural body 3 constituting the aboveground building 2 of a multi-story building and the transmission column 6 provided in the underground of the under part is joined in the axial force transmission zone 7 and the axial force of the RC structural body 3 is transmitted to the permanent sub-substructure 6 to support it. A bearing breakage preventive means 10 is provided in the axial force transmission zone 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an axial force transmission structure for joining, in an axial force transmission region, an RC (Reinforced Concrete) structure that constitutes the above-ground part of a multi-layered building and a structural pillar that is arranged below and constitutes an underground part. For example, the present invention relates to an axial force transmission structure of an RC structure and a structural pillar, which is effective when, for example, a high-rise multi-layer building is constructed by a reverse driving method.

In the case of constructing a multi-layered building having an above-ground part (above floor) and an underground part (underground floor), in recent years, a reverse construction method has often been adopted as a new construction technique.
In this reverse driving method, a structural column that functions as a temporary material is provided in the basement, and the ground structure is supported by this structural column, so that the above-ground work and the underground work can be performed simultaneously. As a result, the construction period of the entire building is shortened.
Patent Document 1 (Japanese Patent Application Laid-Open No. 7-259107) describes a technique related to a column connecting structure for constructing a structure by using a steel-made structural pillar and performing a reverse construction method. This structure also uses steel columns on the ground, so if you connect the above-mentioned pillars and the underground structural pillars together, the axial force from the steel pillars to the structural pillars will both Is easy to communicate.
JP 7-259107 A

However, in recent years, with the increase in the number of buildings, multi-story buildings with RC structures are gradually increasing. Therefore, even when constructing a multi-layered building having such an RC structure and having an underground part, a technique capable of being constructed by the reverse driving method has been demanded in order to shorten the construction period.
In the reverse striking method in a multi-layer building having such an RC structure, the RC column of the multi-layer building and the steel structure column under the multi-layer building are joined in the axial force transmission region. In this axial force transmission region, the axial force is transmitted from the RC column to the structural column by the support pressure. However, if the axial force transmission region does not have sufficient support strength, it may be destroyed by the support pressure. There is.
In order to prevent destruction of the axial force transmission region due to the support pressure, it is necessary to prevent the support pressure applied to the axial force transmission region from becoming large during the reverse driving method. As a result, there is no margin in the bearing capacity of the axial force transmission area, so when using the back-strike method, the period during which simultaneous construction of the underground part and the ground part is shortened, and the counter-attack aiming to shorten the construction period There was a problem that the merit of the construction method could not be fully extracted.

  The present invention has been made to solve such a problem, and an axial force for transmitting and supporting an axial force of an RC structure such as an RC column, a wall, or a beam to a lower structural column. An object of the present invention is to provide an RC structure and a structural pillar axial force transmission structure in which the transmission region does not cause a failure due to a support pressure.

In order to achieve the above object, the RC structure according to the present invention and the axial force transmission structure of the true pillar are the RC structure constituting the ground part of the multi-layer building and the structure provided in the underground part below the RC structure. This is an axial force transmission structure in which a column is joined in an axial force transmission region and the axial force of the RC structure is transmitted to and supported by the structural column, and a bearing failure prevention means is provided in the axial force transmission region.
As a specific embodiment, for example, the bearing failure prevention means includes at least a plurality of incisors arranged in a substantially horizontal direction inside the axial force transmission region and a spiral embedded in the axial force transmission region. It has at least one selected from the group consisting of a streak or a cylindrical pipe and a soft concrete part provided in the axial force transmission region, and exhibits a sufficient bearing capacity.
In the axial force transmission structure, preferably, the RC structure is an RC column, a wall or a beam, and the frame column is a frame column of a steel structure, and a multi-layered building is constructed by a reverse driving method. For example, the RC pillar is a side pillar or a corner pillar.

  Since the RC structure and the structural pillar axial force transmission structure of the present invention are configured as described above, the axial force transmission region for transmitting and supporting the axial force of the RC structure to the underlying structural pillar. However, there is no risk of destruction due to bearing pressure.

In the axial force transmission structure of the following embodiment, an RC (steel reinforced concrete) structure constituting the above-ground part of a multi-layer building and a structural pillar provided in the basement below are joined in an axial force transmission region. The axial force of the structure is transmitted to and supported by the stem.
Since the bearing failure prevention means is provided in the axial force transmission area and this bearing failure prevention means exhibits the bearing resistance and reinforces the axial force transmission area, the axial force transmission structure The purpose of preventing destruction is realized.

Multi-story buildings include apartment buildings, office buildings, hotels, etc. In addition to flat plate-like buildings, multi-story buildings are rectangular and layered buildings, center-core type buildings with a lifting mechanism on the center core, Alternatively, it may be a building having a hollow space inside (a B-shape or a C-shape).
In the following embodiments, the RC structure is an RC pillar or a seismic wall. However, the RC structure may be a wall or beam other than the seismic wall. Although the case where the axial force transmission structure is applied to the reverse driving method and the multi-layer building is constructed by the reverse driving method has been shown, the axial force transmission structure may be applied to a method other than the reverse driving method.

Embodiments according to the present invention will be described below with reference to FIGS.
1 to 17 show an embodiment of the present invention. 1A, 1B, and 1C are front sectional views of the entire multi-layer building during construction of the multi-layer building, at the time of the upper building, and at the time of the subsequent earthquake, respectively.
FIG. 2 is a cross-sectional view for explaining an axial force transmission structure of an RC (steel reinforced concrete) structure and a structural pillar, FIG. 3 is a plan view of the axial force transmission region, and FIG. 4 is a perspective view of the axial force transmission region. . 5A and 5B are a plan structural view and a front sectional view showing an axial force transmission structure of a seismic wall and a structural pillar.

As shown in FIGS. 1 to 5, a multi-layered building 1 such as an apartment house is a structure having an RC structure as a whole, and is constructed by a reverse driving method.
The axial force transmission structure in the multi-layer building 1 includes an RC pillar 3 (or a wall such as a seismic wall 4) as an RC structure constituting the above-ground part (ground floor) 2 of the multi-layer building 1 and an underground part below it ( The structural pillar 6 provided on the basement floor 5 is joined by the axial force transmission region 7 (or 8).
The axial force transmission region 7 or 8 transmits and supports the axial force F of the RC structure (RC column 3 or earthquake-resistant wall 4) to the structural column 6. The axial force transmission regions 7 and 8 have an RC structure, and the axial force transmission regions 7 and 8 are provided with a bearing failure prevention means 10 so that an RC structure (RC column 3 or earthquake-resistant wall 4) and a built-up column are provided. 6 axial force transmission structure is constituted.

The structural column 6 is usually made of steel using a shape steel or the like, and the upper RC structure (the RC column 3 or the seismic wall 4) and the lower structural column 6 are connected to the axial force transmission regions 7, 8 respectively. Therefore, a bearing pressure is generated in the axial force transmission regions 7 and 8 due to a difference in cross-sectional area and shape between the structural pillar 6 and the RC structure.
Under such circumstances, in the axial force transmission regions 7 and 8, in order to smoothly transmit the axial force F from the upper RC structure to the lower steel structure pillar 6, a local force due to the support pressure is used. It is necessary to prevent destruction.
Therefore, in the present invention, the axial force transmission regions 7 and 8 for transmitting and supporting the axial force F of the RC structure to the lower structural pillar 6 are used to exhibit sufficient bearing strength and break the bearing. The bearing failure preventing means 10 that can prevent the above is positively provided to reinforce the axial force transmission regions 7 and 8. That is, since there is a reinforcing function of the support pressure destruction prevention means 10, there is no possibility that the axial force transmission regions 7 and 8 are locally destroyed by the support pressure.

The multi-layer building 1 has an above-ground part 2 composed of a plurality of floors and an underground part 5 composed of one or more floors, and is supported by a foundation structure part 11. The foundation structure 11 is constructed on the lowest floor of the basement 5. The foundation structure part 11 connects a foundation constructed with a predetermined span length L by a foundation beam 12, and the foundation is supported by a pile 13.
In this multi-layered building 1, the construction of the underground part 5 is required, so that the entire construction period is shortened by installing the construction pillar 6 by adopting the reverse construction method and performing the construction of the underground part 5 and the ground part 2 at the same time. I am doing so.

In the ground portion 2 of the multi-layer building 1, the RC structure 3, the RC structure orthogonal beam 14 fixed orthogonally to the RC structure 3, and other RC structures constitute a frame structure 15. ing. The frame structure 15 has the earthquake-resistant wall 4 (FIG. 5) fixed to the orthogonal beam 14, but the frame structure 15 may not have the earthquake-resistant wall 4.
Here, the “framework structure” is a structure in which a wire such as a column or a beam and a surface member (a seismic wall 4, a door wall having a function of a seismic wall, a surface member such as a wall brace) are combined, A structure that is composed of secondary structural members integrated with a frame and can resist external forces such as seismic forces in terms of structural design.

The structural pillar 6 is often used as a temporary material when the multi-layer building 1 is constructed. As the structural pillar 6 made of steel, a shaped steel, for example, an H-shaped steel is used, but a steel pipe may be used. Since the true pillar 6 is shaped steel (or steel pipe), a plate-like top plate 16 is attached to the head of the true pillar 6.
As for the head position of the structural pillar 6, there are cases such as the interior of the first-floor pillar, the interior of the first-floor beam, and the bottom of the first-floor beam, but it has the greatest construction advantage with the least interference with other reinforcing bars. Thus, in this embodiment, the position of the head of the stem column 6 is below the first floor beam.
In the underground part 5 of the multi-layer building 1, a frame structure in the underground part 5 is constituted by a structural pillar 6, an RC orthogonal beam 14 fixed orthogonally to the structural pillar 6, and other RC structures. Is configured.

The lower part of the structural pillar 6 is fixed to the pile 13 via a foundation, and the head of the structural pillar 6 is an axial force transmission region 7 (or an axial force transmission region 8 (FIG. 5)). As shown by a circle B in FIG. 1, the axial force transmission region 7 of the stigma 6 is located at substantially the same height as the ground GL or in the vicinity of the ground GL. A supporting pressure is generated at 7 (or 8 (FIG. 5)).
The support pressure is a compressive force that acts on the contact surface between the RC column 3 (or the seismic wall 4 (FIG. 5)) and the structural column 6 located therebelow. The strength that can withstand this compressive force and does not cause local breakage such as splitting or sliding shear failure is called “bearing strength”.

Conventionally, an axial force transmission structure that transmits an axial force between an RC structure and a steel structure column with a stud or a friction mechanism attached to the steel frame is known, but compared to this conventional technology, In the present invention, since the transmission of the axial force F between the RC structure (RC column 3 and the seismic wall 4) and the structural column 6 is processed by the supporting pressure, the shaft has a short transmission length in the vertical direction. Force F can be transmitted.
As a result, it is not necessary to extend the structural pillar 6 through the axial force transmission region 7 and to extend upward, so that the structural pillar 6 and the beam of the orthogonal beam 14 interfere with each other in the axial force transmission region 7. Can be prevented.
In addition, since the transmission length in the vertical direction for axial force transmission is short, the depth H (FIG. 2 (A)) for excavating the root for this axial force transmission structure can be shallow, and construction is easy. become.

In the axial force transmission structure of the present embodiment, the RC structure is the RC pillar 3 or the seismic wall 4, the structural pillar 6 is the structural pillar of the steel structure, and the multi-layer building 1 is constructed by the reverse driving method. Show.
The RC structure may be a beam, or the structural pillar 6 may be a PCa (precast concrete) column instead of the steel structure.

In the case of constructing the multi-layer building 1 by the reverse driving method, the structural pillar 6 is fixed to the upper part of the pile 13 via a foundation. Then, the RC pillar 3 (and the seismic wall 4) and the structural pillar 6 are joined in the axial force transmission region 7 (and 8), and the RC pillar 3 (and in the axial force transmission region 7 (and 8)). The axial force F of the earthquake resistant wall 4) is transmitted to and supported by the structural pillar 6.
In this reverse driving method, the construction of the ground part 2 and the construction of the underground part 5 are performed in parallel. In the ground part 2, the frame structure 15 is sequentially constructed from the lower floor to the upper floor, and in the underground part 5, after excavation work is performed, the orthogonal beam 14 and the like are attached to attach the frame structure 15 in the underground part 5. Build sequentially. Thus, in the reverse driving method, since the ground part 2 and the underground part 5 can be simultaneously constructed, the construction period of the whole building is shortened.
FIG. 1 (A) shows a state where the ground part 2 and the underground part 5 are being constructed in parallel. Eventually, at the time of the upper building shown in FIG. 1 (B), the entire frame structure 15 of the above-ground part 2 and the frame structure of the underground part 5 are constructed. FIG. 1C shows a case where a seismic force G is applied to the multi-layer building 1 before or after the multi-layer building 1 is completed.

As shown in FIG. 3 (A), the RC pillar 3 is an inner pillar in which orthogonal beams 14 are connected in four orthogonal directions in plan view, or in plan view as shown in FIG. 3 (B). In the case of a side column in which orthogonal beams 14 are connected in three orthogonal directions, and as shown in FIG. 3C, a corner column (corner column) in which orthogonal beams 14 are connected in two orthogonal directions 90 degrees apart in plan view. Column).
When the RC pillar 3 is an inner pillar (FIG. 3A), orthogonal beams 14 are connected to the axial force transmission region 7 in four directions.
On the other hand, when the RC pillar 3 is a side pillar (FIG. 3B) or a corner pillar (FIG. 3C), in the axial force transmission region 7, there is one outer surface 17 to which the orthogonal beam 14 is not connected. Or there are two. As a result, the axial force transmission region 7 of the side column and the corner column tends to have a relatively small bearing strength compared to the axial force transmission region 7 of the inner column.

In view of this, in the side column and the corner column, the bearing force proof strength of the axial force transmission region 7 is improved by providing the bearing failure prevention means 10 that exhibits a reinforcing function in the axial force transmission region 7. In addition, since the bearing failure preventing means 10 is provided also in the axial force transmission region 7 of the inner column to exert the reinforcing function, the bearing strength of the axial force transmission region 7 of the inner column is further improved.
3 (A) to 3 (C) show a case in which the supporting pressure fracture preventing means 10 is configured by embedding the spiral muscle 30 (or the cylindrical pipe 30a (FIG. 11)) in the axial force transmission region 7. FIG. ing. A hoop line 31 is embedded in the inner part of the axial force transmission region 7 near the outer peripheral surface.

FIG. 2A shows a structure in which a top plate 16 is attached to the head of the structural pillar 6, and the axial force transmission region 7 transmits the axial force F of the RC column 3 to the structural pillar 6 by using a support pressure. Is shown. By doing so, the excavation depth H in the axial force transmission region 7 becomes shallow, so the burden of excavation work is reduced.
FIG. 2B shows a case where in the axial force transmission region 7, a plurality of incisors 32 are arranged in the horizontal direction at least inside the axial force transmission region 7 as the bearing failure preventing means 10. In this case, the RC pillar 3 is a side pillar or a corner pillar. Note that the “reinforcing bar” is a reinforcing bar that is inserted in advance in order to integrate the concrete portion.

In the present embodiment, the reinforcing bar 32 is arranged to extend a predetermined distance from the axial force transmission region 7 to the inside of the orthogonal beam 14. One side of the insertion bar 32 protrudes outward from the outer surface 17 of the axial force transmission region 7.
An iron plate 33 is provided as a contact plate on the outer surface 17, and the iron plate 33 is pressed against the outer surface 17 of the axial force transmission region 7 by screwing a nut 34 into the insertion bar 32. Thereby, the insertion bar 32 is positioned and fixed inside the axial force transmission region 7 and exhibits a sufficient bearing resistance.
The support bar breakage preventing means 10 is constituted by the insertion bar 32, the iron plate 33, the nut 34, and the like. Note that the iron plate 33 may be omitted.

FIG. 4 shows various variations of the bearing failure prevention means 10 having a function of reinforcing the axial force transmission region 7, and shows the axial force transmission region 7 when the RC column 3 is a side column. The structural pillar 6 is covered with a rough finish RC (reinforced concrete) 35 whose outer surface is rectangular (or circular) in plan view.
FIG. 4 (A) shows a case where the supporting force breakage preventing means 10 having the same configuration as the supporting pressure breakage preventing means 10 shown in FIG. 2 (B) is provided in the axial force transmission region column 7.
FIG. 4B shows a case of the bearing failure preventing means 10 having a configuration in which the nut 34 screwed into the insertion bar 32 is directly pressed against the outer surface 17 without using the iron plate 33 shown in FIG. 4A. ing. Since there is no iron plate 33, the strength of reinforcing the axial force transmission region 7 by positioning and fixing the reinforcing bar 32 is slightly reduced, but if applied to the axial force transmission region 7 where the bearing pressure may be small, the bearing failure is prevented. The means 10 can exhibit a sufficient bearing strength and prevent the bearing from being broken.

4 (C), a rectangular shaped concrete portion 36 is formed on the outer surface 17 (FIG. 2 (B)) of the axial force transmission region column 7, and an iron plate 33 is provided on the outer surface of the concrete surface portion 36. A nut 34 screwed into the insertion bar 32 is pressed against the iron plate 33.
The bearing breakage preventing means 10 provided in the axial force transmission region 7 includes a reinforcing bar 32, an iron plate 33, a nut 34, and an old concrete portion 36. Since the bearing breakage preventing means 10 has the soft concrete portion 36 provided to increase the volume in the axial force transmission region 7, it is possible to exert a greater bearing strength.

As shown in FIGS. 4 (A) to (C), the bearing failure preventing means 10 includes a plurality of incisors 32 arranged in a substantially horizontal direction at least inside the axial force transmission region (7 or 8), and It has at least one selected from the group consisting of spiral muscles 30 or cylindrical pipes embedded in the axial force transmission region and a soft concrete portion 36 provided to increase the volume in the axial force transmission region. And exhibit sufficient bearing strength.
As described above, the support pressure breakage preventing means 10 provided in the axial force transmission region exhibits a sufficient bearing strength, so that there is no possibility that the axial force transmission region is broken due to the support pressure.

In FIG. 5, the axial force transmission structure of the seismic wall 4 and the structural pillar 6, which is a kind of wall as an RC structure, includes the seismic wall 4 constituting the ground part 2 of the multi-layer building 1 and the underground part 5 below the seismic wall 4. The structural pillar 6 provided in the structure is joined to the axial force transmission area 8, and the axial force transmission area 8 transmits and supports the axial force of the earthquake resistant wall 4 to the structural pillar 6. .
The axial force transmission region 8 is provided with a bearing failure prevention means 10 that can exhibit sufficient bearing resistance and prevent the bearing failure. Thereby, there is no possibility that the axial force transmission region 8 for transmitting and supporting the axial force of the earthquake resistant wall 4 to the structural pillar 6 will be broken by the supporting pressure.
The bearing fracture preventing means 10 includes a plurality of incisors 32 that penetrate the seismic wall 4, an iron plate 33 that penetrates the incision bar 32, and is provided on both sides of the seismic wall 4, and is screwed into the incisors 32. And a nut 34 fastened and fixed so as to be in pressure contact with 33. Since the top plate 16 is provided at the top of the structural pillar 6, the axial force of the earthquake resistant wall 4 is transmitted to the structural pillar 6 through the top plate 16.
Thus, even when the RC structure of the ground portion 2 is the earthquake resistant wall 4, the bearing failure preventing means 10 having substantially the same configuration as that of the RC pillar 3 is provided in the axial force transmission region 8, and the axial force The same operational effects as in the case of the transmission region 7 are achieved.

Next, taking the axial force transmission region 7 as an example, the advantages of increasing the bearing strength will be described.
1 and 2,
σb0: bearing pressure on the top of the top plate 16 during construction of the ground part 2 and the underground part 5 σb1: bearing pressure on the top of the top plate 16 at the completion of construction σb2: bearing pressure applied by the seismic force G at the time of earthquake σb : Bearing pressure at the upper part of the top plate 16 σbu: bearing strength. The relationship of the supporting pressure in the axial force transmission region 7 is as shown in the following equation (1).
σb = σb1 + σb2 (1)

As shown in FIG. 1C, when the seismic force G acts on the building 1 during the earthquake among the plurality of axial force transmission regions 7, the axial force transmission region 7 on the pulling side (left side of FIG. 1C) However, since the support pressure σb of the following equation (2) acts, the support pressure σb is small, so that the axial force transmission region 7 is not broken.
σb = σb1 −σb2 (2)
On the other hand, in the axial force transmission region 7 on the compression side (right side of FIG. 1C) at the time of the earthquake, the support pressure σb2 at the time of the earthquake is added, and the support pressure σb shown in the equation (1) is applied to the axial force transmission region 7. Since this acts, this axial force transmission region 7 becomes the maximum support pressure generating portion. The condition for preventing the compression-side axial force transmission region 7 from being destroyed by the supporting pressure is expressed by the following equation (3).
σb (= σb1 + σb2) <σbu (3)

Therefore, in the present invention, the bearing load proof strength of the axial force transmission region 7 is increased by the bearing force failure prevention means 10 exhibiting sufficient bearing strength in the axial force transmission region 7 to prevent the bearing failure. Therefore, the bearing pressure σb1 at the completion of construction can be increased. Since the bearing pressure σb1 can be increased in this way, the number of floors of the above-ground part 2 that can be constructed simultaneously with the underground part 5 by the reverse driving method can be increased.
Since the construction period of the underground part 5 is usually longer than the construction period of the above-ground part 2, if the number of floors of the above-ground part 2 that can be simultaneously constructed by the reverse driving method is increased, the period during which the above-ground part 2 and the underground part 5 can be constructed simultaneously is longer. Therefore, the construction period of the entire multi-layer building 1 can be shortened.
In particular, when the RC column 3 is the axial force transmission region 7 of a side column or a corner column, the bearing surface strength tends to be low because the outer surface 17 without an orthogonal beam exists. Therefore, in the present invention, since the bearing failure preventing means 10 is provided in the axial force transmission region 7, the axial force transmission region 7 has sufficient bearing strength even in the case of these side columns and corner columns. There is no risk of causing damage.

FIG. 6 is a plan structural view showing the axial force transmission structure in the corner column, and FIG. 7 is a front structural view taken along line VII-VII in FIG. FIG. 8 is a view showing a modification of FIG. 7 and is a front structural view of an axial force transmission structure in a corner column.
FIG. 9 is a diagram showing still another modified example of FIG. 7, and is a front structural view of an axial force transmission structure in a corner column. FIG. 10 is a diagram illustrating a modification of FIG. 9, and is a front structural diagram of an axial force transmission structure in a corner column. FIG. 11 is a diagram illustrating still another variation of FIG. 7, and an axial force transmission structure in a corner column. FIG.
12 is a plan structural view showing the axial force transmission structure in the side column, FIG. 13 is a front structural view taken along line XIII-XIII in FIG. 12, and FIG. 14 is a sectional plan view showing the axial force transmission structure in the inner column, FIG. FIG. 15 is a front structural view of FIG. 14.
FIG. 16 is a diagram showing still another modified example, and is a plan structural view showing an axial force transmission structure in a corner column, and FIG. 17 is a front structural view taken along line XVII-XVII in FIG.

In the axial force transmission structure shown in FIGS. 6 and 7, the bearing failure preventing means 10 is provided in the axial force transmission region 7 between the RC column (in this case, the corner column) 3 and the orthogonal beam 14. The case where it provided in the direction parallel to is shown.
The bearing breakage preventing means 10 has the same configuration as that shown in FIG. 2B, and is provided so as to be orthogonal to each direction of the two orthogonal beams 14 arranged 90 degrees apart. The insertion bar 32 is arranged between the upper and lower beam main bars 50.
An iron plate 33 is provided on each of the perpendicular outer surfaces 17 of the axial force transmission region 7, and the insertion bar 32 and the beam main bar 50 positioned by the iron plate 33 are positioned and fixed by screwing a nut 34. Column main bars 51 and hoop bars 52 are arranged in the RC column 3. The insertion bar 32, the beam main bar 50, the column main bar 51, and the hoop bar 52 are arranged so as not to interfere with each other.
The iron plate 33 is formed in a large rectangle so as to position the entire insertion bar 32 and the main beam bar 50. Thereby, it can prevent more effectively that the outer surface 17 of the axial force transmission area | region 7 bulges outward by a supporting pressure.

In the axial force transmission region 7 in the RC column (here, the corner column) 3 shown in FIG. 8, the beam principal bar 50 of the orthogonal beam 14 is bent inside the axial force transmission region 7, and the axial force transmission region 7. The case where it does not protrude outward from the outer surface 17 is shown. And the iron plate 33 is made into a comparatively small shape, and the insertion bar 32 is positioned and held by screwing into the insertion bar 32 with a nut.
In this case, since the iron plate 33 is small, handling is easy, and the operation of screwing the nut 34 into the beam main reinforcing bar 50 is not necessary, so that the construction of the bearing failure preventing means 10 is facilitated.

In the bearing failure prevention means 10 provided in the axial force transmission region 7 in the RC column (here, the corner column) 3 shown in FIG. 9, the iron plate 33 for the reinforcing bar 32 and the iron plate for the upper beam main bar 50 are used. The case where 33 and the iron plate 33 for the lower beam main reinforcement 50 are mutually separated is shown. A spiral muscle 30 is embedded in the axial force transmission region 7.
Since the bearing breakage preventing means 10 uses the spiral muscle 30 in addition to the insertion bar 32, the bearing breakage can be prevented by exerting a greater bearing resistance. In addition, although the iron plate 33 was isolate | separated for the insertion bar 32 and the beam main reinforcement 50, you may make the whole into one board, without isolate | separating the iron plate 33. FIG.

In the axial force transmission region 7 of the RC column (here, the corner column) 3 shown in FIG. 10, the supporting pressure fracture preventing means 10 has the spiral reinforcement 30 but does not have the insertion reinforcement. If it does in this way, the operation | work which provides an incision will become unnecessary and construction will become easy. The upper and lower beam main bars 50 are positioned and held by the iron plate 33 and the nut 34, respectively.
A cylindrical pipe 30a is used in place of the spiral reinforcement 30 (FIGS. 9 and 10) for the bearing failure prevention means 10 in the axial force transmission region 7 of the RC column (here, the corner column) 3 shown in FIG. The cylindrical pipe 30 a is embedded in the axial force transmission region 7. Other configurations are the same as those in FIG.
According to the support pressure fracture preventing means 10 shown in FIG. 10 and FIG. 11, it is not necessary to provide a reinforcing bar, so that the construction is simple, and the spiral bar 30 and the cylindrical pipe 30 a are provided inside the axial force transmission region 7. Is embedded, the concrete inside the axial force transmission region 7 is restrained and is not easily destroyed, and the bearing strength of the axial force transmission region 7 is further improved.

In the bearing failure prevention means 10 in the axial force transmission region 7 of the RC column (here, the side column) 3 shown in FIGS. 12 and 13, the reinforcing bar 32 in one direction (the left-right direction in FIG. 12). However, it extends from the outer surface 17 to the inside of the orthogonal beam 14 on the opposite side to the outer surface 17.
Regarding the other direction (vertical direction in FIG. 12), the reinforcing bar 32 is provided so as to extend from the inside of the axial force transmission region 7 into both the orthogonal beams 14. May be omitted.
Since the PC column 3 is a side column, there is only one outer surface 17 in the axial force transmission region 7, and the bearing fracture preventing means 10 such as the insertion bar 32 provided in one direction from the outer surface 17 is sufficient for supporting. Demonstrate bearing pressure by demonstrating pressure bearing strength.

14 and 15 show a case where the RC pillar 3 is an inner pillar. An orthogonal beam 14 is connected to the axial force transmission region 7 of the inner column in four orthogonal directions in plan view. Therefore, the reinforcing bar 32 of the support pressure fracture preventing means 10 is provided in the axial force transmission region 7 so as to face four orthogonal directions. Nuts 34 for improving the adhesion force are respectively screwed into both ends of the insertion bar 32.
The support pressure fracture preventing means 10 includes an axial force transmission region 7, an insertion bar 32 embedded in the orthogonal beam 14, and a nut 34. In this way, even in the case of the inner column, the bearing failure preventing means 10 exhibits bearing resistance, so that the axial force transmission region 7 is not likely to break due to the bearing pressure.

16 and 17 show still another modification. In the axial force transmission structure shown in FIGS. 16 and 17, the bearing failure prevention means 10 is provided in the axial force transmission region 7 between the RC column (in this case, the corner column) 3 and the orthogonal beam 14. The axial force transmission region 7 joins the RC column 3 and the structural column 6 to transmit and support the axial force of the RC column 3 to the structural column 6. It is provided in a direction parallel to the orthogonal beam 14.
The bearing failure prevention means 10 has a plurality of reinforcing bars 32 arranged in a substantially horizontal direction only inside the axial force transmission region 7 and exhibits sufficient bearing resistance. The incisors 32 are provided orthogonally to each other in pairs (three in one set) in parallel with the directions of the two orthogonal beams 14 arranged 90 degrees apart.
Column main bars 51 and hoop bars 52 are arranged in the RC column 3. The insertion bar 32, the beam main bar 50, the column main bar 51, and the hoop bar 52 are arranged so as not to interfere with each other.

Plural (three) reinforcing bars 32 parallel to each other are arranged between the upper and lower beam main bars 50 and are located at substantially the same height position. Note that the position and number of the reinforcing bar 32 between the upper and lower beam main bars 50 are appropriately determined.
Fixing nuts 53 that function as a fixing plate are screwed to both ends of the insertion bar 32 so as to be positioned inside the axial force transmission region 7. The nut 53 is also screwed into the end portion of the beam main bar 50. Since the nuts 53 are provided at both ends of the insertion bar 32 and the end of the beam main bar 50, the fixing force with the concrete is improved.
Since the bearing pressure failure prevention means 10 is provided in the axial force transmission region 7, there is no possibility that the axial force transmission region 7 is broken due to the bearing pressure. Further, since the insertion bar 32 and the nut 53 are accommodated only within the axial force transmission region 7 and completed within the axial force transmission region 7, it is not necessary to attach an iron plate or the like to the outer surface of the axial force transmission region 7. The work efficiency is improved and the appearance is improved.

18 to 23 are explanatory diagrams of the results of experiments conducted by the inventor.
18 to 21 show four specimens No. 1 to No. 4 (reference numerals SP1 to SP4 in the figure), respectively. In FIGS. 18 to 21, (A), (B), and (C) are a plan view, a front cross-sectional view of the test body, and an axial force F applied to the upper surface by turning the test body upside down. FIG.
22 and 23 are tables and graphs showing experimental data of four specimens No. 1 to No. 4. In FIG. 23, the horizontal axis indicates the indentation displacement of the surface receiving the axial force F of the test body when the axial force F is applied to the test body, and the vertical axis indicates the bearing stress level (and the supporting pressure). Show.

Specimen No. 1 (symbol SP1) corresponding to the prior art shown in FIG. 18 is not provided with a bearing failure prevention means, so that an axial force F is applied to the upper surface thereof as shown in FIG. When added, cracks C were generated in the vertical direction, and the outer peripheral surface E of the specimen No. 1 was greatly swollen and destroyed.
Specimen No. 2 (reference numeral SP2) shown in FIG. In the case of this test body No. 2, twelve incisors 32 are provided in one direction and twelve incisors 32 are provided in the other direction orthogonal thereto.
As shown in FIG. 19C, when the axial force F is applied to the upper surface, the specimen No. 2 is restrained from bulging where the incisor 32 is provided, and the outer peripheral surface E of the portion where the incisor 32 is not present. Swelled slightly and cracks C occurred in the vertical and horizontal directions.

In specimen No. 3 (reference numeral SP3) shown in FIG. 20, in addition to the configuration of specimen No. 2 (reference numeral SP2) shown in FIG. 19, spiral muscles 30 are embedded in specimen No. 3. .
As shown in FIG. 20C, when the axial force F is applied to the upper surface, some cracks C are generated in the specimen No. 3, but the outer peripheral surface E hardly swells. Further, the degree of crack C is also reduced as compared with specimen No. 2 shown in FIG.

Specimen No. 4 (reference numeral SP4) shown in FIG. 21 has orthogonal beams 14 connected in four orthogonal directions in plan view. Incisors 32 are also arranged in four orthogonal directions in plan view. Twelve reinforcing bars 32 are arranged in the direction of each orthogonal beam 14.
At both ends of each insertion bar 32, the iron plate 33 is applied to the end face of the orthogonal beam 14, and a nut 34 is screwed into the end part of the insertion bar 32, so that each insertion bar 32 is positioned and fixed. A spiral muscle 30 is embedded in the axial force transmission region.
As a result, as shown in FIG. 21C, even when the axial force F is applied to the upper surface of the specimen No. 4, cracks C hardly occur.

As a result of the above-described experiment, as shown in FIGS. 22 and 23, the four specimens No. 1 to No. 4 have different bearing stresses, and specimens No. 1 to No. 4 It was found that the bearing stress level gradually improved as cracks progressed and cracking was less likely to occur.
According to the test bodies No. 2 to No. 4 of the present invention as compared with the conventional test body No. 1, the bearing load bearing strength in the axial force transmission region is improved, so that breakage due to the bearing pressure can be prevented.

In particular, it was found that the effect of the orthogonal beam around the axial force transmission region is great as a means for increasing the bearing strength around the axial force transmission region. It has also been found that the bearing strength is increased by embedding the insertion bar 32 and the spiral bar 30 in the axial force transmission region.
In the case of an axial force transmission region with orthogonal beams attached in the four orthogonal directions (for example, the axial force transmission region of the inner column), the bearing load resistance is sufficient, but the orthogonal beams are attached in the three orthogonal directions and the two orthogonal directions. In the case of an axial force transmission region (for example, an axial force transmission region of a side column or a corner column), it is preferable to reinforce a portion where no orthogonal beam is attached with a support pressure fracture prevention means.
In this way, the bearing failure prevention means exhibits bearing strength, so that, for example, bearing strength almost equivalent to the axial force transmission region with orthogonal beams attached in four directions can be obtained. It is possible to prevent the destruction of the part without the mark.

Although the embodiments of the present invention (including modifications, the same applies hereinafter) have been described above, the present invention is not limited to the above-described embodiments, and various modifications, additions, and the like are within the scope of the present invention. Is possible.
In the drawings, the same reference numerals denote the same or corresponding parts.

  The present invention can be applied to the RC structure and the axial force transmission structure of a true pillar in a multi-layer building constructed by a reverse driving method or the like.

1 to 17 are views showing an embodiment of the present invention, and FIG. 1 is a front sectional view of the entire multi-layer building. It is sectional drawing for demonstrating the axial force transmission structure of RC structure and a true pillar. It is a top view of an axial force transmission area. It is a perspective view of an axial force transmission area. 5A and 5B are a plan structural view and a front sectional view showing an axial force transmission structure of a seismic wall and a structural pillar. It is a top view showing the axial force transmission structure in a corner pillar. It is the VII-VII line front structure figure of FIG. It is a figure which shows the modification of FIG. 7, and is a front structural drawing of the axial force transmission structure in a corner pillar. It is a figure which shows the other modification of FIG. 7, and is a front structural drawing of the axial force transmission structure in a corner pillar. It is a figure which shows the modification of FIG. 9, and is a front structural drawing of the axial force transmission structure in a corner pillar. It is a figure which shows the other modification of FIG. 7, and is a front structural drawing of the axial force transmission structure in a corner pillar. It is a top view showing the axial force transmission structure in a side pillar. FIG. 13 is a front structural view taken along line XIII-XIII in FIG. 12. It is a plane sectional view showing an axial force transmission structure in an inner pillar. FIG. 15 is a front structural view of FIG. 14. Furthermore, it is a figure which shows another modification, and is a plane structure figure which shows the axial force transmission structure in a corner pillar. It is the XVII-XVII line front structure figure of FIG. 18 to 23 are explanatory diagrams of experimental results. FIG. 18 shows specimen No. 1 corresponding to the prior art. Specimen No. 2 is shown. Specimen No. 3 is shown. Specimen No. 4 is shown. It is a table | surface which shows the experimental data of four test bodies No.1-No.4. It is a graph which shows the experimental data of four test bodies No.1-No.4.

Explanation of symbols

1 Multi-story building 2 Above-ground part 3 RC pillar (RC structure)
4 Earthquake-resistant wall (RC structure, wall)
5 Underground part 6 Construction column 7, 8 Axial force transmission region 10 Support pressure destruction prevention means 30 Spiral reinforcement 30a Tubular pipe 32 Insertion bar 36 Soft concrete part F Axial force

Claims (4)

The RC structure that forms the above-ground part of a multi-layer building and the structural pillar provided in the basement below it are joined in the axial force transmission area to transmit the axial force of the RC structure to the structural pillar for support. An axial force transmission structure that
An RC structure and a structural pillar axial force transmission structure characterized in that a bearing failure prevention means is provided in the axial force transmission region.   The bearing failure prevention means includes at least a plurality of incisors arranged in a substantially horizontal direction inside the axial force transmission region, a spiral line or a cylindrical pipe embedded in the axial force transmission region, and an axial force. 2. The RC structure according to claim 1, which has at least one selected from the group consisting of soft concrete portions provided in a transmission region and exhibits sufficient bearing strength. 3. Axial force transmission structure.   The RC structure is an RC column, a wall or a beam, the frame column is a frame column of a steel structure, and a multi-layered building is constructed by a reverse driving method. Axial force transmission structure of RC structure and true pillar.   The RC structure pillar and the pillar structure axial force transmission structure according to claim 3, wherein the RC pillar is a side pillar or a corner pillar.

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