JP2018104964A - Column structure and construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column structure that has a concrete-filled steel pipe structure and can solve various problems caused by insertion of a reinforcing bar into a steel pipe, and a construction method.SOLUTION: A column structure 100 which has a concrete-filled steel tube structure, has H-shaped steel 2 present in a square steel tube 1 to an overall length of the square steel tube 1, and is filled with concrete 3 between the H-shaped steel 2 and the square steel tube 1. Then the column structure may have two or more column structures 100, having a structure like this, arranged successively above as a column structure part. A column structure like this is constructed by joining together an upper part of the H-shaped steel 2 of a lower layer-side column structure part (column structure 100) and a lower part of the H-shaped steel 2 of an upper layer-side structure part by bolt joining or the bolt joining and welding in combination.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a column structure having a concrete-filled steel pipe structure and a construction method for constructing the column structure.

  In Patent Document 1, even when the width of a structural column of a concrete-filled steel pipe structure is larger than the diameter of the structural column, the connection between the structural column and the structural column is able to transmit the axial force of the structural column. A structure is disclosed. In addition, Patent Document 2 discloses that the foundation pile and the foundation pillar provided in the ground are connected integrally and the axial force acting on the foundation pillar is transmitted to the foundation pile. An axial force transmission structure comprising a bearing portion that is provided on the lower end side of a structural column embedded in the foundation pile and transmits axial force acting on the structural column to the foundation pile by supporting pressure is disclosed. ing.

  Conventionally, in concrete-filled steel pipe structures, column strength is increased by inserting rebars that are pre-assembled in a bowl shape, or by inserting each rebar into a steel pipe and assembling it. ing.

JP 2014-1552 A JP 2009-7745 A

  However, in the column structure in which the rebar is inserted into the steel pipe to increase the column strength, there is a problem that in the rebar insertion work into the steel pipe, handling at the work site is not easy due to low rigidity in the rebar, In addition, there is also a problem that it is necessary to arrange a reinforcing bar for assembling the reinforcing bars. Furthermore, if a through hole is formed in a diaphragm in a steel pipe in a concrete-filled steel pipe structure and a large number of reinforcing bars are passed through, the defect area in the diaphragm will be increased.

  On the other hand, the technique of the above-mentioned Patent Document 2 is a structure in which a steel pillar having an upper structure is inserted into a pile body of a cast-in-place pile. For example, as shown in FIG. There is a structural part in which a reinforced steel pipe exists around the concrete to be inserted. However, such a structure does not exist over the entire length of the steel pipe.

  In view of the above circumstances, an object of the present invention is to provide a column structure having a concrete-filled steel pipe structure that can solve various problems caused by inserting a reinforcing bar into the steel pipe.

  In order to solve the above problems, the column structure of the present invention is a column structure having a concrete-filled steel pipe structure, in which the steel material exists in the steel pipe over the entire length of the steel pipe, and the steel material and the steel pipe The concrete is filled with concrete.

  If it is said structure, since it becomes a structure which inserts steel materials in a steel pipe instead of a reinforcing bar, various problems, such as difficulty of the reinforcing bar handling in the structure using a reinforcing bar, can be eliminated. And since the said steel material exists over the full length of the said steel pipe, the axial strength improvement as a pillar can be aimed at over the full length of the said steel pipe.

  The steel material side joining member attached to the steel material may be joined to the steel pipe side joining member attached in the steel pipe, and the steel material and the steel pipe may be positioned and fixed.

  The steel material may include stress transmission means for transmitting stress from the concrete to the steel material. Moreover, a stiffener is provided as the stress transmission means, and the stiffener may form a concrete filling passage by being separated from the diaphragm in the steel pipe.

  Moreover, the column structure of the present invention is a column structure in which two or more column structures described in any one of the above are continuously arranged as a column structure part, and the upper part and the upper layer side of the steel material in the column structure part on the lower layer side The lower part of the steel material in the column structure part is joined by bolt joining or a combination of bolt joining and welding.

  With the above configuration, a column structure is formed by adding a steel pipe and steel material of a unit length to the upper part.For example, a column longer than the unit length is constructed at the construction site while the unit length is a length corresponding to a truck bed. Can be built. In addition, when it is necessary to improve the axial strength as a column only on the lower layer side, the above-mentioned column structure portion is formed in the steel pipe of one or more unit lengths on the lower layer side, and in the upper layer steel pipe, concrete without steel material is formed. It can be a filled steel pipe structure.

  Further, the construction method of the present invention is a construction method for constructing the above-mentioned column structure, in which the steel material is arranged and fixed in the steel pipe in the column structure part which is the first layer, manufactured in a factory and transported to the column construction site In this column construction site, the upper part of the steel material in the steel pipe is joined to the lower part of the steel material arranged on the upper layer side.

  If it is said method, since the pillar structure part used as the first layer will be manufactured in a factory, compared with on-site manufacture, manufacture as a design will be easy and the quality improvement of a pillar can be aimed at.

  If it is this invention, in the column structure which has a concrete filling steel pipe structure, there exists an effect that the various problems at the time of inserting a reinforcing bar in a steel pipe can be solved.

It is the figure which showed the outline of the pillar structure which concerns on embodiment of this invention, Comprising: The figure (A) is a cross-sectional view, The figure (B) is a longitudinal cross-sectional view. It is the schematic explanatory drawing which showed the construction method which continuously provides the pillar structure of FIG. 1 as a pillar structure part upwards. It is the figure which showed the outline of the column structure which concerns on other embodiment of this invention, Comprising: The figure (A) is a cross-sectional view, The figure (B) is a longitudinal cross-sectional view. It is the figure which showed the outline of the pillar structure pillar structure which concerns on other embodiment of this invention, Comprising: The figure (A) is a cross-sectional view, The figure (B) is a longitudinal cross-sectional view. It is the figure which showed the outline of the column structure which concerns on other embodiment of this invention, Comprising: The figure (A) is a cross-sectional view, The figure (B) is a longitudinal cross-sectional view.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1A and 1B, the column structure 100 has a concrete-filled steel pipe structure (CFT structure). In this embodiment, a rectangular steel pipe having a predetermined length is used. (Unit long steel pipe) The H-section steel 2 exists in the rectangular steel pipe 1 over the entire length of the 1 and has a structure in which the concrete 3 is filled between the H-section steel 2 and the rectangular steel pipe 1. .

  Further, for example, a through-type diaphragm 4 serving as a connection point of a beam is provided at a midpoint in the height direction of the rectangular steel pipe 1. A quadrilateral through-hole 4a for allowing the H-shaped steel 2 to pass therethrough is formed at the center of the diaphragm 4 in the steel pipe. The size of the through hole 4a is such that a predetermined clearance can be obtained between the flange of the H-shaped steel 2 and the ease of insertion and positioning of the through-hole 4a of the H-shaped steel 2 is determined. It is set in consideration of the displacement range. Also, the concrete 3 (mortar component) can be present in this clearance.

  Inside the upper portion of the square steel pipe 1, a steel pipe side joining member 11 is fixed by welding. This steel pipe side joining member 11 consists of a plate member, for example, from the inner surface of the said square steel pipe 1. FIG. It protrudes in a direction perpendicular to the inner surface. The steel pipe side joining member 11 is formed with a plurality of bolt insertion holes (loose holes, long holes) in the horizontal direction. In addition, although the said steel pipe side joining member 11 may be fixed to the inner side of the said square steel pipe 1 in a construction site, in this Example, it attaches in the manufacturing stage in the factory of the said square steel pipe 1. FIG. Thus, when attaching in a manufacturing stage, since the said steel pipe side joining member 11 can be attached in the state which put the said square steel pipe 1 in the side, attachment work becomes easy.

  Further, a steel material side joining member 21 is provided at a height position corresponding to the position of the steel pipe side joining member 11 on the flange at the upper portion of the H-shaped steel 2. The steel material-side joining member 21 has a substantially T-shape including a contact plate portion that is contacted and joined to the flange, and a protruding plate portion that protrudes from the contact plate portion. It consists of a tee (CT) fitting. A plurality of bolt insertion holes are formed in the contact plate portion and the flange of the H-shaped steel 2 in the horizontal direction, and the nuts are screwed into the bolts that are passed through the bolt insertion holes. The contact plate portion is fixed to the flange of the H-shaped steel 2. A plurality of bolt insertion holes (loose holes, long holes) are also formed in the protruding plate portion in the horizontal direction, and the bolts that are passed through the bolt insertion holes and the bolt insertion holes of the steel pipe side joining member 11 are provided. The steel material side joining member 21 is fixed to the steel pipe side joining member 11 by screwing the nut. Further, at the time of fixing, position adjustment (positioning) for positioning the H-shaped steel 2 at the center of the rectangular steel pipe 1 can be performed by the bolt insertion hole (loose hole, long hole). In addition, although the said steel material side joining member 21 may be fixed in the manufacturing stage in the factory of the said H-section steel 2, in this Example, it attaches and fixes at the construction site. If the steel material side joining member 21 is retrofitted to the H-shaped steel 2 at the construction site, the fixing position of the steel material side joining member 21 is flexible, so that the H-shaped steel 2 is placed at the center of the square steel pipe 1. It becomes easy to perform the position adjustment work to position.

  Further, the H-section steel 2 is provided with a plurality of stiffeners 22 made of plate-like members arranged horizontally. Each stiffener 22 is fixed to the flange and the web by welding between the back surfaces of the opposing flanges of the H-section steel 2 and functions as a stress transmission means for transmitting stress from the concrete 3 to the H-section steel 2. . The stiffener 22 is spaced upward or downward from the diaphragm 4 in the steel pipe, and a concrete filling passage is formed by this separation.

  Moreover, the lower end location of the said square steel pipe 1 and the said H-shaped steel 2 is being fixed by welding etc. on the base plate 5 anchored to the ground side, for example. The base plate 5 may be formed with a through hole for draining moisture in the concrete 3. Further, the concrete 3 can be press-fitted from the lower side of the square steel pipe 1 or can be dropped from the upper end opening of the square steel pipe 1. The fluidized concrete that has entered the rectangular steel pipe 1 reaches the whole through the concrete filling passage.

  The column structure 100 having the above configuration has a structure in which the H-shaped steel 2 is inserted into the rectangular steel pipe 1 instead of a reinforcing bar. Therefore, it is difficult to handle the reinforcing bar at a construction site in a structure using the reinforcing bar. The problem can be solved. And since the said H-section steel 2 exists over the full length of the said square steel pipe 1, the axial strength improvement as a pillar can be aimed at over the full length of the said square steel pipe 1. FIG.

  Moreover, the steel material side joining member 21 attached to the H-shaped steel 2 is joined to the steel pipe side joining member 11 attached in the rectangular steel pipe 1, and the positioning and fixing of the H-shaped steel 2 is performed. Positioning and fixing can be performed accurately with simple operations.

  Further, since the H-section steel 2 includes the stiffener 22 (stress transmission means), the stress can be accurately transmitted from the concrete 3 to the H-section steel 2. Moreover, since the said stiffener 22 is spaced apart from the said diaphragm 4 in the steel pipe of a panel zone to an up-down direction, a concrete filling channel | path will be formed appropriately.

  The above-described two or more pillar structures 100 can be a pillar structure continuously arranged upward as a pillar structure portion. For example, as shown in FIG. 2, a plurality of bolt insertion holes are formed in a predetermined arrangement in the web and flange at the upper end portion of the H-section steel 2 of the lower column structure 100. The end of another H-section steel 2 is abutted and connected to the upper side of the H-section steel 2 of the column structure (concrete is not filled) 100 with the H-section steel 2 having such bolt insertion holes inserted therein. A plurality of bolt insertion holes are also formed in a predetermined arrangement in the web and flange at the lower end portion of the upper H-section steel 2, and the joining plate 23 in which the bolt insertion holes are formed in an arrangement corresponding to both predetermined arrangements is formed on the web. And the two H-section steel 2 arrange | positioned up and down is mutually joined by screwing a nut through these volt | bolt insertion holes in the state applied to the flange, and screwing a nut. The joining plate 23 may be further welded to the two H-section steels 2. Moreover, although the steel material side joining member 21 is not yet attached to the upper part of said another H-section steel 2, the bolt insertion hole which attaches this is formed.

  In the column structure 100, column joints 12 project on both sides of the beam 8 so as to avoid the beam 8 (see FIG. 1) on the outer surfaces of the two opposite surfaces of the rectangular steel pipe 1 in the column structure 100. Has been. These column joints 12 protrude above the upper end of the square steel pipe 1. This projecting portion can serve as a guide for the square steel pipe 1 when the square steel pipe 1 disposed on the upper side is lowered from above.

  Further, on the outer surface of the lower part of each of the two opposing surfaces of another rectangular steel pipe 1 provided on the upper side of the rectangular steel pipe 1, the column joint portion 13 is arranged corresponding to the arrangement position of the column joint portion 12. Projected. The column joint portion 12 and the column joint portion 13 are formed with bolt insertion holes in the horizontal direction, and are substantially rectangular connecting plates having bolt insertion holes at positions corresponding to the positions where these bolt insertion holes are formed. 14 is provided over the column joint portion 12 and the column joint portion 13, and the two square steel pipes 1 arranged above and below are joined to each other by screwing nuts through the bolt insertion holes. . In addition, you may further weld the contact location of the two square steel pipes 1 arrange | positioned above and below.

  As described above, when the column structure is formed by continuously arranging two or more column structures 100 as the column structure portion, a column structure can be formed by adding a steel pipe and a steel material having a unit length to the upper portion. Pillars longer than the unit length can be built at the construction site, with the length corresponding to the loading platform. Here, when a column structure is formed by adding a unit length of steel pipe and steel material to the upper part, generally, a lower column structure is required to have high column strength. Therefore, in one high column by joining, only one or a plurality of nodes in the lower layer is used as the column structure 100, and a column structure without steel material can be formed in the column portion above this. Even in such a column structure, the unit length (node) is the column structure according to the present invention in which the steel material exists in the steel pipe over the entire length of the steel pipe.

  In the above example, after the upper H-section steel 2 is joined to the lower H-section steel 2, the upper-section square steel pipe 1 is placed so that the H-section steel 2 is passed through the square steel pipe 1. The upper rectangular steel pipe 1 arranged in this manner is joined onto the lower rectangular steel pipe 1. The procedure is not limited to such a procedure, and it is also possible to employ a procedure in which the upper square steel pipe 1 is first disposed and then the upper H-section steel 2 is attached through the square steel pipe 1. In this case, for example, the above-mentioned H-shaped steel in which a working opening is formed on the lower side of the upper rectangular steel pipe 1 and the H-shaped steel 2 inserted later using this opening is provided first. It can also be set as the construction method which joins to 2 and blocks the said opening after that.

  Moreover, the construction method which manufactures the column structure (concrete is unfilled) 100 used as the first layer at a construction site can be adopted. For example, at the construction site, the H-section steel 2 is built vertically on the base plate 5 and the square steel pipe 1 is inserted from above so that the H-section steel 2 passes through the square steel pipe 1. Do better. On the contrary, the square steel pipe 1 is built vertically on the base plate 5 and the H-section steel 2 is inserted from above so that the H-section steel 2 passes through the built square steel pipe 1. Is possible. Also in this case, for example, an opening for work is formed on the lower side of the square steel pipe 1, and the H-section steel 2 inserted later can be joined to the base plate 5 using this opening.

  On the other hand, the column structure (concrete is not filled) 100 can be manufactured in a factory. That is, a state in which the H-section steel 2 is arranged and fixed in the rectangular steel pipe 1 in the column structure portion which is the first layer is manufactured at a factory and transported to the column construction site. You may make it join the upper part of the H-section steel 2, the lower part of the H-section steel 2 arrange | positioned at the upper layer side, and the said square steel pipe 1 and the square steel pipe 1 provided in the upper layer side. With such a method, since the column structure portion as the first layer is manufactured at the factory, it is easier to manufacture as designed compared to on-site manufacturing, and the quality of the column can be improved.

  In the above example, the H-shaped steel 2 includes the stiffener 22 as the stress transmission means. However, the present invention is not limited to this, and the following can be used as the stress transmission means.

  The structure shown in FIGS. 3A and 3B includes a web opening 6A formed in the web of the H-section steel 2 as stress transmission means. Since the concrete 3 enters the web opening 6A, the same steel-concrete synthesizing effect as that of the perforated steel plate gibber can be exhibited. The flange opening of the H-section steel 2 may be formed alone or in combination with the web opening 6A. Further, such an opening and the stiffener 22 may coexist. In addition, a reinforcing plate that reinforces the periphery of such an opening may be provided.

  In the structure shown in FIGS. 4A and 4B, a headed stud 6B is provided on the web and flange of the H-shaped steel 2 as stress transmission means. The headed stud 6B is provided in a range surrounded by the web of the H-shaped steel 2 and the flange, and the diaphragm in the steel pipe when the H-shaped steel 2 is inserted into the square steel pipe 1. 4 is not interfered.

  The structure shown in FIGS. 5 (A) and 5 (B) includes a lattice 6C assembled as a stress transmitting means so as to cross between the flanges of the H-shaped steel 2. For example, one surface portion of a long L-shaped angle is fixed to the end side of the flange by welding or screwing or the like with its longitudinal direction oriented in the vertical direction. The other surface portion of the L-shaped angle is positioned orthogonal to the flange at the end of the flange, and the lattice 6C is fixed to the other surface portion by welding or screwing. Also in this case, the lattice 6C is provided so as not to interfere with the diaphragm 4 in the steel pipe when the H-section steel 2 is inserted into the square steel pipe 1. Not only the lattice 6C but also a lattice plate can be provided. Moreover, when it is set as the assembly pillar which provides such a lattice and a lattice board, a grooved steel, angle steel, T-shaped steel, etc. can be used as steel materials. Moreover, when it is set as an assembly column, it can also be set as the structure where a weak-axis direction does not produce easily like H-section steel.

  Even when the stiffener 22, the web opening 6 </ b> A, and the headed stud 6 </ b> B are used, the steel material is not limited to the H-shaped steel, and a cross H-shaped steel having no weak axis direction can be used. However, it is desirable not to use a steel material having a closed cross section. Moreover, it can also be set as the structure which put many steel materials upright adjacently and was joined greatly. In this case, a square steel pipe having a rectangular cross section may be used. Moreover, when using rectangular rectangular steel pipe and using H-section steel as a steel material, the strong axis direction of H-section steel may be made parallel to the rectangular short side direction of the rectangular steel pipe. The steel pipe is not limited to a square steel pipe but may be a round steel pipe. Further, as the stress transmission means, those other than those exemplified above can be used.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

1: Square steel pipe (steel pipe)
2: H-section steel (steel)
3: Concrete 4: Diaphragm 4a: Through hole 5: Base plate 6A: Web opening (stress transmission means)
6B: Stud with head (stress transmission means)
6C: Lattice (stress transmission means)
11: Steel pipe side joining member 12: Column joining part 13: Column joining part 14: Connecting plate 21: Steel material side joining member 22: Stiffener (stress transmitting means)
23: Joining plate 100: Column structure

Claims (6)

  A pillar structure having a concrete-filled steel pipe structure, wherein a steel material is present in the steel pipe over the entire length of the steel pipe, and concrete is filled between the steel material and the steel pipe. Construction.   In the column structure according to claim 1, the steel material side joining member attached to the steel material is joined to the steel pipe side joining member attached in the steel pipe, and the steel material and the steel pipe are positioned and fixed. Characteristic pillar structure.   3. The column structure according to claim 1, wherein the steel material includes stress transmission means for transmitting stress from the concrete to the steel material. 4.   4. The column structure according to claim 3, wherein a stiffener is provided as the stress transmission means, and the stiffener forms a concrete filling passage by being separated from a diaphragm in the steel pipe. .   A column structure in which the two or more column structures according to any one of claims 1 to 4 are continuously arranged upward as a column structure part, and the upper part of the steel material and the column structure on the upper layer side in the column structure part on the lower layer side Column structure characterized in that the lower part of the steel material in the part is joined by bolt joining or a combination of bolt joining and welding.   6. A construction method for constructing a column structure according to claim 5, wherein a steel material is arranged and fixed in a steel pipe in a column structure portion as a first layer, manufactured in a factory, and transported to a column construction site. The construction method characterized by joining the upper part of the steel material in the said steel pipe, and the lower part of the steel material arrange | positioned at the upper layer side at the construction site.

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