JP2000303557A - Steel framed reinforced concrete structure using thickened wall steel pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve bearing force, reduce cost and facilitate construction. SOLUTION: A column 1 is composed of a wall-increased steel pipe 2, concrete 3 placed in the steel pipe 2, and reinforcements 4 embedded in the concrete 3. The thickened wall steel pipe 2 has an increased wall part 2a formed at a part in the longitudinal direction by high frequency induction heating and compression. Beams are jointed to this thickened wall part 2a by bolts or the like. The reinforcements 4 are previously built up into a cage-like reinforcement built-up body 4A with column main reinforcements 4a and hoops 4b and arranged being inserted from above after erecting the thickened wall steep pipe 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel reinforced concrete structure using a thickened steel pipe applied to various types of buildings and a method of constructing the structure.

[0002]

2. Description of the Related Art As a structure for increasing the strength of a steel pipe column, there is a case where concrete is filled in the column. Such a concrete-filled steel tubular column is generally, as shown in FIG.
A diaphragm 102 is provided in a beam connection part of a steel pipe column 101,
This is adopted in the case of a column-beam joint structure in which the beam 103 is welded.
The diaphragm 102 is made of a rectangular steel plate, and the column 101 is divided into upper and lower parts and welded to the divided part.

[0003]

In such a structure in which the diaphragm 102 is used for the column connection portion, the steel pipe column 101 is divided as described above, and the diaphragm 102 is formed in the divided portion.
Therefore, it takes time and effort to form a beam joint, and high quality control is also required. Therefore, the cost increases. On the other hand, even with the steel pipe concrete column as described above, there may be cases where a satisfactory required yield strength cannot be obtained. Improving proof strength can be expected by embedding reinforcing steel.
2 makes it difficult to insert a reinforcing bar into the steel tube column 101.

[0004] The present invention has been made to solve the above problems, and has as its object to improve the yield strength, reduce the cost, and facilitate the construction.

[0005]

According to the present invention, there is provided a steel reinforced concrete structure using a thickened steel pipe, in which a column has a thickened steel pipe having a thickened portion formed by heating and compressing in a part of a longitudinal direction, and is cast into the steel pipe. It is composed of concrete and steel bars embedded in the concrete. The beam is joined to the thickened portion. By using the thickened steel pipe in this way, the beam can be firmly joined without using a reinforcing material such as a diaphragm. Therefore, it is easy to insert the rebar into the pillar.
Further, by making the steel-framed reinforced concrete structure by using the thickened steel pipe in this way, it is possible to construct a column-beam frame structure which is excellent in proof strength and easy to construct at low cost. Since the thickened portion is a portion formed integrally with the steel pipe by heating and compression, the thickened portion has high quality and high reliability, and the thickened portion can be formed easily and inexpensively as compared with centrifugal casting or the like. It is preferable that the reinforcing bars are assembled into a cage-shaped reinforcing bar assembly including a plurality of pillar reinforcing bars extending in the longitudinal direction of the pillar and a hoop surrounding the pillar reinforcing bars.

[0006] When constructing this steel-framed reinforced concrete structure, a thickened steel pipe having a thickened portion by heating and compression in a part in the longitudinal direction is prepared and erected. on the other hand,
A cage-shaped rebar assembly consisting of a plurality of pillar bars and hoops surrounding the pillar bars is prepared. This rebar assembly is inserted into the thickened steel pipe from above, and then concrete is poured into the thickened steel pipe. In this construction method, in the case where the thickened steel pipe is connected vertically, when the thickened steel pipe of each section connected vertically is erected from below, the reinforcing assembly is added to the thickened steel pipe. It is preferable to insert it into the steel pipe from above. When inserting the reinforcing bar assembly, it is preferable that a guide member to be brought into contact with the inner surface of the steel pipe is attached to one of the hoops, so that the insertion can be performed smoothly. It also helps to secure the thickness between the steel pipe and the rebar.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below.
This will be described with reference to FIGS. This steel-framed reinforced concrete structure has a pillar 1 in which a rectangular thickened steel pipe 2 having a thickened portion 2a formed by heating and compressing in a part of the longitudinal direction, a concrete 3 cast in the steel pipe 2, and a concrete 3 in the concrete 3. And a steel beam 5 (FIG. 2) of an H-section steel or the like is joined to the thickened portion 2a. The thickened portion 2a of the thickened steel pipe 2 is processed into a thickened state by applying a compressive force in the axial direction and compressively deforming while heating a part of the steel pipe as a material in the longitudinal direction by high-frequency induction. The compressed and deformed portion is cooled by water cooling or the like immediately after the deformation. In this example, the thickened portion 2a projects from the inner and outer surfaces of the steel pipe 2, and both ends of the thickened portion 2a are tapered portions 2aa whose wall thickness gradually changes. The thickened portion 2a may project only to the outer surface side as shown in FIG. 6B, or may project only to the inner surface side as shown in FIG. 6C.

As shown in FIG. 1B, the reinforcing bar 4 is assembled into a rectangular cylindrical basket-shaped reinforcing bar assembly 4A by a plurality of column main bars 4a and hoops 4b surrounding the outer periphery of the column main bars 4a. It is. The column main reinforcing bars 4a are arranged at four corners of a square having a size that allows a predetermined covering thickness from the inner surface of the thickened steel pipe 2 and at the middle of each side. The column main bars 4a may be provided only at the four corners, or may be provided in a larger number according to the diameter of the steel pipe 2 or the like. As shown in FIG. 3A, the thickened portion 2a of the thickened steel pipe 2
Are provided at a plurality of locations corresponding to the height positions of beams 5 serving as floor beams or the like on each floor, and a plurality of them are connected vertically by column joints 8. The end of the thickened steel pipe 2 joined by the column joint 8 and the end fixed on the foundation 7 are also formed as the thickened portion 2b.

As shown in FIG. 2, the upper and lower flanges 5 a of the beam 5 are joined to the thickened portion 2 a of the thickened steel pipe 2 via split tees 9. The split tee 9 has its head piece 9a joined to the thickened portion 2a with an axial fastener 10 and the leg piece 9a.
b is joined to the upper and lower flanges 5a with bolts 11 such as high strength bolts. In this example, a one-side bolt is used as the shaft-shaped fastener 10, and is inserted through a bolt hole 12 formed in the thickened portion 2a and a bolt hole formed in the split tee 9. Here, the one-side bolt is a general term for a shaft-shaped fastener that can be tightened by forming the head 10a at the other end by plastic deformation in a tightening operation from one end, and is also called a blind bolt. Instead of using the one-side bolt, a screw hole 12A having a screw groove is provided in the thickened portion 2a as shown in FIG.
Alternatively, a nut may be fixed to the back surface, and the split tee 9 may be joined with a normal bolt (not shown).
Also, an end plate (not shown) is provided on the beam 5 without using the split tee 9, and this end plate is joined to the thickened portion 2 a of the thickened steel pipe 2 with the axial fastener 10. You may do it. Further, as shown in the example of FIG.
May be directly joined to the thickened portion 2a of the thickened steel pipe 2 by welding 13.

FIG. 4 shows a specific example of the column joint 8 of FIG.
The column joint 8 is provided with a thickened portion 2b of the upper and lower thickened steel pipes 2, 2.
2b, the side plate 14 is overlapped on each side, and the side plate 1
4 and each of the thickened portions 2b, 2b are joined by an axial fastener 10. Although a one-side bolt is used for the shaft-shaped fastener 10, a screw hole may be formed in the thickened portion 2a and the bolt may be joined with a normal bolt. In addition, the column joint 8 may be one in which the end of the thickened steel pipe 2 remains the same diameter as the general part and is joined by the attachment plate 14 or the like without providing the thickened portion 2b.

This steel reinforced concrete structure (FIG. 3)
In the construction of (A)), the reinforcing bar 4 is previously assembled into a cage-shaped reinforcing bar assembly 4A having a predetermined length as shown in FIG.
After the thickened steel pipe 2 is constructed, it is inserted into the thickened steel pipe 2 from above and arranged at a predetermined position. One reinforcing steel assembly 4A may be provided for one thickened steel pipe 2, but one
May be stacked. For example, the rebar assembly 4A is set from the top in the manner of a cast-in-place pile. In this case, as shown in FIG. 3B, a temporary supporting reinforcing bar 15 is inserted under the hoop 4b near the upper end of the reinforcing bar assembly 4A, and the crane 20 uses the temporary supporting reinforcing bar 15 to reinforce the reinforcing bar assembly. The three-dimensional body 4A is inserted into the thickened steel pipe 2a and suspended. The suspended reinforcing bar assembly 4A is supported on the upper end of the thickened steel pipe 2 by a temporary supporting reinforcing bar 15, as shown in FIG.
Is suspended by the crane 20 as described above.
After binding the upper and lower rebar assemblies 4A with a binding wire 21 such as a number line, the temporary supporting rebar 15 is removed, and the upper rebar assembly 4A is further suspended into the thickened steel pipe 2. By using the temporary supporting reinforcing bar 15 in this manner, the upper and lower reinforcing bar assemblies 4A are stabilized during the work, and the bundling work and the like are facilitated. As shown in the example of FIG. 3, when the thickened steel pipe 2 is spliced up and down, the reinforcing bar assembly 4 </ b> A is inserted into the thickened steel pipe 2 after constructing the thickened steel pipe 2 of each node sequentially assembled from below. The casting of the concrete 3 may be performed, for example, after the construction of the thickened steel pipe 2 up to the uppermost stage is completed, or every time the insertion of the reinforcing bar assembly 4A into the thickened steel pipe 2 of each node is completed. Is also good. In addition, as shown in FIGS. 1B and 2B, insertion guide members 16 may be attached to the reinforcing bar assembly 4A at a plurality of upper and lower locations on each side surface. The guide member 16 has a disk shape having a hoop insertion hole at the center. By attaching the guide member 16 in this manner, the operation of inserting the reinforcing bar assembly 4A into the thickened steel pipe 2 can be performed smoothly without causing a catch or the like. Further, the guide member 16 also serves as a spacer for securing the thickness of the pillar main bar 4a. In addition, the guide member 16 is not limited to a disk-shaped member, and may be, for example, a member obtained by curving a reinforcing bar in a V shape.

According to this frame structure, the reinforcing bars 4
Is a steel reinforced concrete structure column 1 embedded in concrete 3 in a thickened steel pipe 2, so that a solid proof strength can be obtained. In addition, since the thickened steel pipe 2 has a structure in which the thickened portion 2a is provided and the beam 5 is joined, a diaphragm or the like is not required, and the rebar 4 can be easily arranged in the steel pipe 2. In addition, since the thickened portion 2a is formed integrally with the steel pipe 2 by heating and compression,
In addition to high quality and high reliability, it can be formed at the material stage, and has higher productivity than when welding a diaphragm or the like. Moreover, since the thickened portion 2a is formed by heating and compression,
It can be formed easily and inexpensively as compared with centrifugal casting and the like. When the reinforcing bar 4 is assembled into the cage-shaped reinforcing bar assembly 4A in advance as described above and inserted into the thickened steel pipe 2 sequentially from the upper portion, the reinforcing bar 4 can be easily arranged. .

In each of the above examples, the case where the thickened steel pipe 2 is a square steel pipe has been described. However, the thickened steel pipe 2 may be a round steel pipe. FIG. 7 shows an example in which the thickened steel pipe 2 has a round shape, and the end plate 17 of the steel beam 5 is connected to the thickened steel pipe 2.
The shaft-shaped fastener 10 is joined to the thickened portion 2a. The end plate 17 has an arcuate curved surface along the outer diameter surface of the thickened portion 2, and is wider than the H-shaped steel portion of the steel beam 5, and is also longer vertically. Although the one-side bolt is used as the shaft-shaped fastener 10, a threaded hole may be formed in the thickened portion 2a and a normal bolt may be used. End plate 17
May be divided into upper and lower flanges 5a, 5a as in the example of FIG. In this example, the reinforcing steel bar 4 has column main reinforcing bars 4a arranged on the circumference and a hoop 4b provided around the main reinforcing bars 4a. Other configurations are the same as those in the example of FIG.

FIG. 9 shows an example of a reference proposal, in which upper and lower steel pipes 2 are provided.
A thick steel pipe 23 serving as a beam joint is welded between 2 and 22. The beam 5 is joined by using this thick steel pipe in the same manner as the thickened portion 2a of each of the above examples. The rebar 4 is assembled into a rebar assembly 4A as shown in FIG. 1A and inserted into the steel pipe 22 and filled with the concrete 3 in the same manner as in each of the above examples. Thus, the thick steel pipe 2
Also in the case where 3 is used, unlike the diaphragm or the like, the rebar 4 can be easily inserted. In addition, a rigid structure can be provided by compensating for cross-sectional defects caused by bolt holes through which the shaft-shaped fastener 10 is inserted.
In the example of FIG. 9, the thick steel pipe 23 has a larger outer diameter and a smaller inner diameter than the upper and lower steel pipes 22.
3 may have the same outer diameter as the upper and lower steel pipes 22.

[0015]

According to the steel reinforced concrete structure of the present invention, there is provided a thickened steel pipe in which a column has a thickened portion by heating and compression in a part of a longitudinal direction, concrete cast in the steel pipe, and Since it is composed of embedded reinforcing bars and a beam is joined to the thickened portion, it is possible to improve the proof stress, facilitate the construction, and reduce the cost. In the case where the reinforcing bar is formed in a cage shape by a plurality of column reinforcing bars extending in the longitudinal direction of the column and a hoop surrounding these column reinforcing bars, the reinforcing bar is previously assembled as in the method of the present invention. Since it is possible to adopt a method of assembling three-dimensionally and inserting it from the top after building the thickened steel pipe, construction is easier. Each time the thickened steel pipe of each section connected vertically is built from below, the reinforcing bar assembly is inserted from above into the thickened steel pipe,
When placing concrete in a thickened steel pipe, reinforcing bars can be easily arranged in high columns. In the case where a guide member to be brought into contact with the inner surface of the steel pipe is attached to the hoop of the reinforcing steel assembly, when the reinforcing steel assembly is inserted into the thickened steel pipe, the reinforcing steel does not directly hit the inner wall surface of the thickened steel pipe and is easily inserted.
In particular, when the thickened portion of the thickened steel pipe protrudes to the inner surface side, the reinforcing steel does not catch on the protruded thickened portion,
Easy to insert.

[Brief description of the drawings]

FIG. 1 (A) is a partially cutaway perspective view of a column in a steel reinforced concrete structure using a thickened steel pipe, showing a first embodiment of the present invention, and FIG. 1 (B) is a perspective view of the reinforcing bar assembly.

FIG. 2 is a partial perspective view of the steel reinforced concrete structure,
(B) is a sectional view of the same part.

FIG. 3A is a front view of the steel reinforced concrete structure, and FIGS. 3B and 3C are partial cross-sectional views showing a process of inserting the reinforcing bar assembly.

FIG. 4A is a cutaway front view of a column joint portion in the same structure, and FIG. 4B is a vertical sectional view of the same portion.

FIG. 5 is a partial perspective view of a steel reinforced concrete structure according to another embodiment of the present invention.

FIG. 6 is a partial sectional view showing each example of a thickened portion of a thickened steel pipe.

FIG. 7 is a cutaway front view and a horizontal sectional view of a steel reinforced concrete structure according to still another embodiment of the present invention.

FIG. 8 is a front view of a steel reinforced concrete structure according to still another embodiment of the present invention.

FIG. 9 is a front view of a steel reinforced concrete structure according to a reference proposal example.

FIG. 10 is a perspective view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Column, 2 ... Thickening steel pipe, 2a ... Thickening part, 3 ... Concrete, 4 ... Reinforcing bar, 4a ... Column main bar, 4b ... Hoop, 4A ... Rebar assembly, 8 ... Beam joint

[Procedure amendment]

[Submission date] April 3, 2000 (200.4.3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Steel frame reinforced concrete structure using thickened steel pipe
Construction

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention is related to <br/> the thickened steel pipe used SRC structure to be applied to various buildings.

[0002]

2. Description of the Related Art As a structure for increasing the strength of a steel pipe column, there is a case where concrete is filled in the column. Such a concrete-filled steel tubular column is generally, as shown in FIG.
A diaphragm 102 is provided in a beam connection part of a steel pipe column 101,
This is adopted in the case of a column-beam joint structure in which the beam 103 is welded.
The diaphragm 102 is made of a rectangular steel plate, and the column 101 is divided into upper and lower parts and welded to the divided part.

[0003]

In such a structure in which the diaphragm 102 is used for the column connection portion, the steel pipe column 101 is divided as described above, and the diaphragm 102 is formed in the divided portion.
Therefore, it takes time and effort to form a beam joint, and high quality control is also required. Therefore, the cost increases. On the other hand, even with the steel pipe concrete column as described above, there may be cases where a satisfactory required yield strength cannot be obtained. Improving proof strength can be expected by embedding reinforcing steel.
2 makes it difficult to insert a reinforcing bar into the steel tube column 101.

[0004] The present invention has been made to solve the above problems, and has as its object to improve the yield strength, reduce the cost, and facilitate the construction.

[0005]

According to the present invention, there is provided a steel reinforced concrete structure using a thickened steel pipe, wherein a column is formed in a part of a longitudinal direction.
Thickened steel pipe having a thickened part by heating and compression by high-frequency induction, and concrete poured into this steel pipe,
It is composed of reinforcing steel embedded in this concrete. The beam is joined to the thickened portion. The thickening part is, for example,
For example, it extends vertically above and below the entire beam
It is assumed that it was broken. By using the thickened steel pipe in this way, the beam can be firmly joined without using a reinforcing material such as a diaphragm. Therefore, it is easy to insert the rebar into the pillar. Further, by making the steel-framed reinforced concrete structure by using the thickened steel pipe in this way, it is possible to construct a column-beam frame structure which is excellent in proof strength and easy to construct at low cost. Since the thickened portion is a portion formed integrally with the steel pipe by heating and compression, the thickened portion has high quality and high reliability, and the thickened portion can be formed easily and inexpensively as compared with centrifugal casting or the like. The reinforcing bars are assembled into a cage-shaped reinforcing bar assembly including a plurality of pillar reinforcing bars extending in the longitudinal direction of the pillar and a hoop surrounding these pillar reinforcing bars. The hoop is also present within the height range of the thickened portion.
Let

[0006] In insertion of the rebars assembly, to any of the hoops, it is preferable to keep attaching the guide member contacting the inner surface of the steel pipe, thereby smoothly perform mail merge. It also helps to secure the thickness between the steel pipe and the rebar.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below.
This will be described with reference to FIGS. This steel-framed reinforced concrete structure has a pillar 1 in which a rectangular thickened steel pipe 2 having a thickened portion 2a formed by heating and compressing in a part of the longitudinal direction, a concrete 3 cast in the steel pipe 2, and a concrete 3 in the concrete 3. And a steel beam 5 (FIG. 2) of an H-section steel or the like is joined to the thickened portion 2a. The thickened portion 2a of the thickened steel pipe 2 is processed into a thickened state by applying a compressive force in the axial direction and compressively deforming while heating a part of the steel pipe as a material in the longitudinal direction by high-frequency induction. The compressed and deformed portion is cooled by water cooling or the like immediately after the deformation. In this example, the thickened portion 2a projects from the inner and outer surfaces of the steel pipe 2, and both ends of the thickened portion 2a are tapered portions 2aa whose wall thickness gradually changes. The thickened portion 2a may project only to the outer surface side as shown in FIG. 6B, or may project only to the inner surface side as shown in FIG. 6C.

As shown in FIG. 1B, the reinforcing bar 4 is assembled into a rectangular cylindrical basket-shaped reinforcing bar assembly 4A by a plurality of column main bars 4a and hoops 4b surrounding the outer periphery of the column main bars 4a. It is. The column main reinforcing bars 4a are arranged at four corners of a square having a size that allows a predetermined covering thickness from the inner surface of the thickened steel pipe 2 and at the middle of each side. The column main bars 4a may be provided only at the four corners, or may be provided in a larger number according to the diameter of the steel pipe 2 or the like. As shown in FIG. 3A, the thickened portion 2a of the thickened steel pipe 2
Are provided at a plurality of locations corresponding to the height positions of beams 5 serving as floor beams or the like on each floor, and a plurality of them are connected vertically by column joints 8. The end of the thickened steel pipe 2 joined by the column joint 8 and the end fixed on the foundation 7 are also formed as the thickened portion 2b.

As shown in FIG. 2, the upper and lower flanges 5 a of the beam 5 are joined to the thickened portion 2 a of the thickened steel pipe 2 via split tees 9. The split tee 9 has its head piece 9a joined to the thickened portion 2a with an axial fastener 10 and the leg piece 9a.
b is joined to the upper and lower flanges 5a with bolts 11 such as high strength bolts. In this example, a one-side bolt is used as the shaft-shaped fastener 10, and is inserted through a bolt hole 12 formed in the thickened portion 2a and a bolt hole formed in the split tee 9. Here, the one-side bolt is a general term for a shaft-shaped fastener that can be tightened by forming the head 10a at the other end by plastic deformation in a tightening operation from one end, and is also called a blind bolt. Instead of using the one-side bolt, a screw hole 12A having a screw groove is provided in the thickened portion 2a as shown in FIG.
Alternatively, a nut may be fixed to the back surface, and the split tee 9 may be joined with a normal bolt (not shown).
Also, an end plate (not shown) is provided on the beam 5 without using the split tee 9, and this end plate is joined to the thickened portion 2 a of the thickened steel pipe 2 with the axial fastener 10. You may do it. Further, as shown in the example of FIG.
May be directly joined to the thickened portion 2a of the thickened steel pipe 2 by welding 13.

FIG. 4 shows a specific example of the column joint 8 of FIG.
The column joint 8 is provided with a thickened portion 2b of the upper and lower thickened steel pipes 2, 2.
2b, the side plate 14 is overlapped on each side, and the side plate 1
4 and each of the thickened portions 2b, 2b are joined by an axial fastener 10. Although a one-side bolt is used for the shaft-shaped fastener 10, a screw hole may be formed in the thickened portion 2a and the bolt may be joined with a normal bolt. In addition, the column joint 8 may be one in which the end of the thickened steel pipe 2 remains the same diameter as the general part and is joined by the attachment plate 14 or the like without providing the thickened portion 2b.

This steel reinforced concrete structure (FIG. 3)
In the construction of (A)), the reinforcing bar 4 is previously assembled into a cage-shaped reinforcing bar assembly 4A having a predetermined length as shown in FIG.
After the thickened steel pipe 2 is constructed, it is inserted into the thickened steel pipe 2 from above and arranged at a predetermined position. One reinforcing steel assembly 4A may be provided for one thickened steel pipe 2, but one
May be stacked. For example, the rebar assembly 4A is set from the top in the manner of a cast-in-place pile. In this case, as shown in FIG. 3B, a temporary supporting reinforcing bar 15 is inserted under the hoop 4b near the upper end of the reinforcing bar assembly 4A, and the crane 20 uses the temporary supporting reinforcing bar 15 to reinforce the reinforcing bar assembly. The three-dimensional body 4A is inserted into the thickened steel pipe 2a and suspended. The suspended reinforcing bar assembly 4A is supported on the upper end of the thickened steel pipe 2 by a temporary supporting reinforcing bar 15, as shown in FIG.
Is suspended by the crane 20 as described above.
After binding the upper and lower rebar assemblies 4A with a binding wire 21 such as a number line, the temporary supporting rebar 15 is removed, and the upper rebar assembly 4A is further suspended into the thickened steel pipe 2. By using the temporary supporting reinforcing bar 15 in this manner, the upper and lower reinforcing bar assemblies 4A are stabilized during the work, and the bundling work and the like are facilitated. As shown in the example of FIG. 3, when the thickened steel pipe 2 is spliced up and down, the reinforcing bar assembly 4 </ b> A is inserted into the thickened steel pipe 2 after constructing the thickened steel pipe 2 of each node sequentially assembled from below. The casting of the concrete 3 may be performed, for example, after the construction of the thickened steel pipe 2 up to the uppermost stage is completed, or every time the insertion of the reinforcing bar assembly 4A into the thickened steel pipe 2 of each node is completed. Is also good. In addition, as shown in FIGS. 1B and 2B, insertion guide members 16 may be attached to the reinforcing bar assembly 4A at a plurality of upper and lower locations on each side surface. The guide member 16 has a disk shape having a hoop insertion hole at the center. By attaching the guide member 16 in this manner, the operation of inserting the reinforcing bar assembly 4A into the thickened steel pipe 2 can be performed smoothly without causing a catch or the like. Further, the guide member 16 also serves as a spacer for securing the thickness of the pillar main bar 4a. In addition, the guide member 16 is not limited to a disk-shaped member, and may be, for example, a member obtained by curving a reinforcing bar in a V shape.

According to this frame structure, the reinforcing bars 4
Is a steel reinforced concrete structure column 1 embedded in concrete 3 in a thickened steel pipe 2, so that a solid proof strength can be obtained. In addition, since the thickened steel pipe 2 has a structure in which the thickened portion 2a is provided and the beam 5 is joined, a diaphragm or the like is not required, and the rebar 4 can be easily arranged in the steel pipe 2. In addition, since the thickened portion 2a is formed integrally with the steel pipe 2 by heating and compression,
In addition to high quality and high reliability, it can be formed at the material stage, and has higher productivity than when welding a diaphragm or the like. Moreover, since the thickened portion 2a is formed by heating and compression,
It can be formed easily and inexpensively as compared with centrifugal casting and the like. When the reinforcing bar 4 is assembled into the cage-shaped reinforcing bar assembly 4A in advance as described above and inserted into the thickened steel pipe 2 sequentially from the upper portion, the reinforcing bar 4 can be easily arranged. .

In each of the above examples, the case where the thickened steel pipe 2 is a square steel pipe has been described. However, the thickened steel pipe 2 may be a round steel pipe. FIG. 7 shows an example in which the thickened steel pipe 2 has a round shape, and the end plate 17 of the steel beam 5 is connected to the thickened steel pipe 2.
The shaft-shaped fastener 10 is joined to the thickened portion 2a. The end plate 17 has an arcuate curved surface along the outer diameter surface of the thickened portion 2, and is wider than the H-shaped steel portion of the steel beam 5, and is also longer vertically. Although the one-side bolt is used as the shaft-shaped fastener 10, a threaded hole may be formed in the thickened portion 2a and a normal bolt may be used. End plate 17
May be divided into upper and lower flanges 5a, 5a as in the example of FIG. In this example, the reinforcing steel bar 4 has column main reinforcing bars 4a arranged on the circumference and a hoop 4b provided around the main reinforcing bars 4a. Other configurations are the same as those in the example of FIG.

FIG. 9 shows an example of a reference proposal, in which upper and lower steel pipes 2 are provided.
A thick steel pipe 23 serving as a beam joint is welded between 2 and 22. The beam 5 is joined by using this thick steel pipe in the same manner as the thickened portion 2a of each of the above examples. The rebar 4 is assembled into a rebar assembly 4A as shown in FIG. 1A and inserted into the steel pipe 22 and filled with the concrete 3 in the same manner as in each of the above examples. Thus, the thick steel pipe 2
Also in the case where 3 is used, unlike the diaphragm or the like, the rebar 4 can be easily inserted. In addition, a rigid structure can be provided by compensating for cross-sectional defects caused by bolt holes through which the shaft-shaped fastener 10 is inserted.
In the example of FIG. 9, the thick steel pipe 23 has a larger outer diameter and a smaller inner diameter than the upper and lower steel pipes 22.
3 may have the same outer diameter as the upper and lower steel pipes 22.

[0015]

According to the steel reinforced concrete structure of the present invention, there is provided a thickened steel pipe in which a column has a thickened portion by heating and compression in a part of a longitudinal direction, concrete cast in the steel pipe, and Since it is composed of embedded reinforcing bars and a beam is joined to the thickened portion, it is possible to improve the proof stress, facilitate the construction, and reduce the cost. The reinforcing bar includes a plurality of pillars main reinforcement extending in the longitudinal direction of the column, because it was assembled in a cage with a hoop surrounding these pillars main reinforcement, keep teamed up to rebar assembly the reinforcing bars in advance ,
Is a method of inserting from the top is adopted after the erection of the thickening steel pipe, facilities Engineering is Ru der more easily. To the rebars assembly hoop, when attaching the guide member contacting the inner surface of the steel pipe, when inserting the rebar assembly in thickening steel pipe, without hitting directly on the inner wall surface of the rebar thickening steel pipe, plug liable . In particular, when the thickened portion of the thickened steel pipe projects to the inner side, the reinforcing bar can be easily inserted without being caught by the projected thickened portion.

[Brief description of the drawings]

FIG. 1 (A) is a partially cutaway perspective view of a column in a steel reinforced concrete structure using a thickened steel pipe, showing a first embodiment of the present invention, and FIG. 1 (B) is a perspective view of the reinforcing bar assembly.

FIG. 2 is a partial perspective view of the steel reinforced concrete structure,
(B) is a sectional view of the same part.

FIG. 3A is a front view of the steel reinforced concrete structure, and FIGS. 3B and 3C are partial cross-sectional views showing a process of inserting the reinforcing bar assembly.

FIG. 4A is a cutaway front view of a column joint portion in the same structure, and FIG. 4B is a vertical sectional view of the same portion.

FIG. 5 is a partial perspective view of a steel reinforced concrete structure according to another embodiment of the present invention.

FIG. 6 is a partial sectional view showing each example of a thickened portion of a thickened steel pipe.

FIG. 7 is a cutaway front view and a horizontal sectional view of a steel reinforced concrete structure according to still another embodiment of the present invention.

FIG. 8 is a front view of a steel reinforced concrete structure according to still another embodiment of the present invention.

FIG. 9 is a front view of a steel reinforced concrete structure according to a reference proposal example.

FIG. 10 is a perspective view of a conventional example.

[Description of Signs] 1 ... Column, 2 ... Thickened steel pipe, 2a ... Thickened part, 3 ... Concrete, 4 ... Reinforcing bar, 4a ... Column main bar, 4b ... Hoop, 4A ... Reinforcing bar assembly, 8 ... Beam joint

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04C 5/06 E04C 5/06

Claims (5)

[Claims] A pillar is composed of a thickened steel pipe having a thickened part by heating and compression in a part of its length, a concrete cast in the steel pipe, and a reinforcing bar embedded in the concrete. A steel reinforced concrete structure using a thickened steel pipe in which a beam is joined to the thickened portion. 2. The augment according to claim 1, wherein said reinforcing bars are assembled into a cage-shaped reinforcing bar assembly comprising a plurality of column reinforcing bars extending in the longitudinal direction of the columns and a hoop surrounding these column reinforcing bars. Steel frame reinforced concrete structure using meat steel pipe. 3. A cage-shaped reinforcing bar comprising a process of building a thickened steel pipe having a thickened portion formed by heating and compression in a part of its length as a column, a plurality of pillar main bars and a hoop surrounding the column main bars. A steel reinforced concrete structure using a thickened steel pipe including a step of preparing an assembly, a step of inserting the rebar assembly into the thickened steel pipe from above, and a step of thereafter pouring concrete into the thickened steel pipe. Construction method. 4. The thickening according to claim 3, wherein the reinforcing steel assembly is inserted into the thickening steel pipe from above each time the thickening steel pipe of each section connected vertically is built from below. Construction method of steel reinforced concrete structure using steel pipe. 5. The method for constructing a steel reinforced concrete structure using a thickened steel pipe according to claim 3, wherein a guide member to be brought into contact with the inner surface of the steel pipe is attached to a hoop of the reinforcing steel assembly.