JP2016121472A - Column head and column base structure of axial column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column head and column base structure of an axial column capable of preventing generation of cracks and/or collapses in a column head part and a column base part of an axial column and a connection part thereof when a building is deformed in a horizontal direction.SOLUTION: An axial column 10 has a column head part 20 and a column base part 30 the diameters of which decrease toward the front end thereof. A horizontal movement prevention rod 90 is disposed between a horizontal member 50 and the column head part 20 and between the horizontal member 50 and the column base part 30; and the column head part 20 and the column base part 30 are connected to the horizontal member 50 respectively. The horizontal member 50 is provided with a concave 60 for inserting the column head part 20 or the column base part 30 thereinto, and between the inner face of the concave 60 and the outer peripheral face of the column head part 20 and the column base part 30, an elastic member 100 is disposed. The horizontal movement prevention rod 90 is preferably set to be free from fixation to at least one of the column head part 20 and the column base part 30 and the horizontal member 50.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an axial force column head and column base structure. Specifically, when a building is deformed horizontally, the axial head column head and column base and the connection portion thereof are not cracked or crushed. Technology.

  As shown in FIG. 4, the axial force column 200 that is currently generally constructed is a column that is installed between horizontal members 50 such as slabs and beams that are present above and below to bear the axial force. The column head 20 and the column base 30 of the power column 200 and the upper and lower horizontal members 50 are in surface contact. In addition, the minimum horizontal stripe 70 and the axial stripe 80 are disposed inside the axial force column 200 in order to bear the axial force. Between the horizontal member 50 and the axial force column 200, there is no shaft. Horizontal movement preventing bars 90 for preventing the horizontal movement of the power pole 200 are provided.

  By the way, it is assumed that the axial force column does not generate bending stress by design, but when the building is deformed horizontally, the column head and column are caused by the balance of force between the horizontal movement prevention bar with adhesive force and the concrete compression edge. Bending stress or deformation occurs in the leg, and there is a risk of cracking or crushing. Similarly, cracks may occur in the concrete tension edges of the column heads and column bases, and the compression edges may collapse. And when a crack or crushing occurs, repair is required.

  Therefore, a technique is disclosed in which both ends of the axial force column are abutted against the side surface of the horizontal member, and a vertical load is transmitted to the slab (horizontal member) so that a bending moment is not transmitted (for example, Patent Documents). 1). The technique described in Patent Document 1 arranges an axial force column that bears a vertical load between upper and lower adjacent slabs (horizontal members), abuts both ends thereof on a slab (horizontal member) surface, and slabs (horizontal members) ) And a vertical load is transmitted to the slab (horizontal member) so that no bending moment is transmitted. By adopting such a configuration, both ends of the axial force column are substantially pin-joined or semi-rigidly joined to the slab (horizontal member), so that the connection with the slab (horizontal member) becomes simple, and the axial force Since there is no transmission of bending moment between the column and the slab (horizontal member), the design of the original flat slab structure is not hindered.

JP 2002-47727 A

  However, since the axial force column and the slab (horizontal member) are in contact with each other in the technique described in Patent Document 1, when the building is horizontally deformed, cracks and crushing occur at both corners of the axial force column. It is hard to say that the possibility of the occurrence has been wiped out.

  Also, instead of bringing the axial force column and the horizontal member into contact with each other on the surface, a recess is formed in the horizontal member, and the column head and the column base of the axial force column are inserted into the recess, and the inner surface of the recess and the axial force column are A structure in which bonding mortar is filled in between may be considered. However, even with such a structure, there is still a possibility that cracks and crushing may occur at both corners of the axial force column.

  The present invention has been proposed in view of the above-mentioned circumstances, and when the building is horizontally deformed, the column head of the axial force column that does not crack or collapse in the column head and column base of the axial force column or the connection portion thereof. The purpose is to provide a column base structure.

  In order to achieve the above-mentioned object, the axial head column structure of the axial force column according to the present invention has the following features. That is, in the column head / column base structure of the axial force column according to the present invention, the column head and the column base of the axial force column are each reduced in diameter toward the tip side, and the column head and the column base and the horizontal member It is characterized in that a horizontal movement preventing line is interposed between (a beam, a slab, etc.) and the column head and column base and the horizontal member are joined.

  In addition to the above-described configuration, the horizontal member is provided with a recess for inserting the column head and the column base, and an elastic body is disposed between the inner surface of the recess and the outer peripheral surface of the column head and the column base ( Can be embedded).

  Moreover, in addition to the structure mentioned above, it is preferable that the horizontal movement prevention | strengthening bar | burr is cut | disconnected in at least one between a column head, a column base part, and a horizontal member. Furthermore, it is preferable to precast the axial force column.

  According to the column head / column base structure of the axial force column according to the present invention, since the column head and the column base portion are reduced in diameter toward the tip side, it is compared with the column head / column base structure of the conventional axial force column. And the area which receives axial force is small. That is, the distribution of the compressive stress generated between the axial force column and the horizontal member becomes narrower as the contact area between the axial force column and the horizontal member is smaller. Therefore, when the building is horizontally deformed, there is no occurrence of cracking or crushing at both corners of the axial force column. For this reason, even if the building is deformed horizontally, it is not necessary to repair the axial force column or the horizontal member, and it is possible to reduce the labor and management cost of construction.

  Further, the horizontal member is provided with a recess for inserting the column head and the column base, and an elastic body is disposed (embedded) between the inner surface of the recess and the outer peripheral surface of the column head and the column base, so that the building is Even when the axial force column rotates around the column head and column base as the center of rotation when deformed horizontally, the elastic body acts as a cushioning material, and the periphery of the column head and column base is damaged. There is no.

  Moreover, the horizontal movement prevention | stretching stripe | line | column can exhibit each effect mentioned above still more reliably because adhesion is cut | disconnected in at least one between a column head, a column base part, and a horizontal member. Furthermore, by precasting the axial force column, construction can be omitted and the construction period can be shortened.

The schematic diagram of the stigma and pedestal structure of the axial force pillar which concerns on embodiment of this invention (Example 1). The schematic diagram of the stigma and the column base structure of the axial force pillar which concerns on embodiment of this invention (Example 2). The schematic diagram which shows the attachment state of a horizontal movement prevention | reduction stripe | line | muscle. Schematic diagram of the stigma / pillar structure of a conventional axial force column.

  Hereinafter, with reference to the drawings, a stigma / base structure of an axial force column according to an embodiment of the present invention will be described. FIG. 1 to FIG. 3 explain the stigma / pillar structure of an axial force column according to an embodiment of the present invention. FIGS. 1 and 2 are schematic views of the stigma / pillar structure of an axial force column. It is a schematic diagram which shows the attachment state of a horizontal movement prevention line. FIG. 4 is a schematic diagram of a stigma / pillar structure of a conventional axial force column.

<Example 1>
In the head / column base structure of the axial force column according to the first embodiment of the present invention, as shown in FIG. 1, the column head 20 and the column base 30 of the axial force column 10 are each reduced in diameter toward the tip side. ing. That is, by forming the tapered surface 40 inclined from the main body portion of the axial force column 10 toward the distal end side, the column head 20 and the column base 30 are tapered as compared with the main body portion, which is necessary. It has an area that supports a large axial force.

  The horizontal member 50 such as a beam or a slab in which the axial force column 10 is built is provided with a recess 60 for fitting (inserting) the column head 20 and the column base 30. The inner diameter of the recess 60 is larger than the outer diameter of the column head 20 and the column base 30, and the column head 20 and the column base 30 can be fitted (inserted) into the recess 60.

  In the axial force column 10, the minimum horizontal stripes 70 and the axial stripes 80 are disposed to bear the axial force. Further, between the horizontal member 50 and the axial force column 10, there is no shaft. Horizontal movement preventing bars 90 for preventing the horizontal movement of the force column 10 are provided. Further, the horizontal movement preventing muscle 90 has one end disposed at a substantially central portion of the axial force column 10 and the other end disposed in the horizontal member 50.

  An elastic body 100 is embedded between the inner surface of the recess 60 and the outer peripheral surfaces of the column head 20 and the column base 30. As the elastic body 100, a material having a cushion effect can be used. The elastic body 100 is embedded between the tapered surfaces 40 of the column heads 20 and the column bases 30 and the inner surfaces of the recesses 60 so that foreign matter does not enter or enter the column heads 20 and the column bases 30. A grout material 110 for transmitting axial force is filled between the existing contact surface with the horizontal member 50 and the back surface (bottom surface) of the recess 60.

<Example 2>
As shown in FIG. 2, the stigma / column base structure of the axial force column 10 according to the second embodiment of the present invention uses the same axial force column 10 as that of the first embodiment, but the horizontal member 50 is not provided with the recess 60. The point is different. Since the structure of the axial force column 10 is the same as that of Example 1 shown in FIG. 1, the same code | symbol is attached | subjected to the same member and description is abbreviate | omitted.

  In the second embodiment, the horizontal member 50 and the tips of the column head 20 and the column base 30 are in surface contact, but since the axial force column 10 is reduced in diameter toward the tip, the contact area with the horizontal member 50 is as follows. Compared with the conventional axial force column 10, it becomes smaller. That is, in the stigma / column base structure of the axial force column 10 according to the second embodiment, the contact area to the horizontal member 50 is smaller than that of the conventional axial force column 10, so even if the building is horizontally deformed, the axial force column 10. No cracking or crushing occurs at the corners of both ends. In the second embodiment, the grout material 110 for transmitting the axial force is filled between the tip surfaces of the column head 20 and the column base 30 and the horizontal member 50, but the tapered surface 40 and the horizontal member 50 The elastic body 100 may not be provided between them.

<Horizontal movement prevention muscle>
The horizontal movement preventing bar 90 is a reinforcing bar that is disposed between the horizontal member 50 and the axial force column 10 and prevents the axial force column 10 from moving horizontally. The horizontal movement preventing muscle 90 is preferably attached to at least one of the column head 20 and the column base 30 and the horizontal member 50. For example, as shown in FIG. 3A, a holding hole 91 in which the horizontal movement preventing muscle 90 can move in the vertical direction is provided at a substantially central portion of the columnar head 20. Further, in the holding hole 81, an urging member 93 such as a spring for causing the horizontal prevention bar 90 to protrude from the holding hole 91 is accommodated. Before the axial force column 10 is built, the horizontal movement preventing bar 90 is held in the holding hole 91, and the biasing member 93 is attached when the axial force column 10 is arranged at a predetermined building position. The horizontal movement preventing muscle 90 is moved upward (projected from the holding hole 91) by the force, and the upper half portion of the horizontal movement preventing muscle 90 is inserted into the insertion hole 92 provided in the horizontal member 50.

  On the other hand, as shown in FIG. 3 (b), a holding hole 91 in which the horizontal movement preventing muscle 90 can move in the vertical direction is provided at a substantially central portion of the column base 30, and before the axial force column 10 is built, When the horizontal movement prevention bar 90 is positioned in the holding hole 91 and the axial force column 10 is arranged at a predetermined erected position, the horizontal movement prevention bar 90 is moved downward (projects from the holding hole 91) to be horizontal. The lower half of the movement preventing muscle 90 is inserted into the insertion hole 92 provided in the horizontal member 50.

  By adopting the structure shown in FIGS. 3A and 3B, the horizontal movement preventing muscle 90 can be attached to at least one of the horizontal member 50 and the axial force column 10. When the holding hole 91 and the insertion hole 92 are provided and the horizontal movement prevention bar 90 is provided, the horizontal prevention bar 90 is shorter than the total length of the holding hole 91 and the insertion hole 92. When any external force is applied, the horizontal prevention bars 90 may come out of the holding hole 91 or the insertion hole 92. Therefore, it is preferable that the adhesion is not left in part with the horizontal member 50 or the axial force column 10 over the entire length of the horizontal prevention bar 90 but is left in a part.

  Although not shown, the horizontal movement preventing muscle 90 is not held in the holding holes 91 provided in the column head 20 and the column base 30 of the axial force column 10, but the holding holes 91 are provided in the horizontal member 50. The horizontal movement preventing muscle 90 may be held, and the insertion hole 92 may be provided in the column head 20 and the column base 30 of the axial force column 10.

  Although not shown, the horizontal movement preventing muscle 90 may be fixed to the axial force column 10 in either one or both of the column head 20 and the column base 30. In this case, in the horizontal member 50, it is preferable to cut off the attachment of the horizontal movement preventing muscle 90. The structure that cuts off the adhesion of the anti-horizontal muscle 90 between the column head 20 and the column base 30 and the horizontal member 50 is not limited to the above-described structure. For example, the adhesion to the outer periphery of the anti-horizontal muscle 90 is cut in advance. It is also possible to arrange a material that can be used.

<Installation of axial force column>
The installation method of the axial force column 10 according to the present invention is as described above, but in the case of the structure of the first embodiment, between the inner surface of the recess 60 and the outer peripheral surfaces of the column head 20 and the column base 30. The elastic body 100 that functions as a cushioning material and embeds foreign matter is embedded. Further, a grout material 110 for transmitting an axial force is filled between the front end surfaces of the column head 20 and the column base 30 and the back surface (bottom surface) of the recess 60. Further, in the case of the structure of the second embodiment, the elastic body 100 is not necessarily provided, and the axial force is transmitted between the tip surface of the column head 20 and the column base 30 and the horizontal member 50. The grout material 110 is filled.

<Precast>
The axial force column 10 of Example 1 and Example 2 is precast, and as described above, is installed between the horizontal members 50 existing above and below. It is also possible to hit on-site without precasting. That is, a mold frame is installed between the horizontal members 50 existing above and below, and the minimum horizontal stripe 70 and the axis stripe 80 are disposed in order to bear the axial force in the mold frame. Is disposed. Also in this case, it is preferable to cut off the attachment of the horizontal movement preventing muscle 90 in at least one of the horizontal member 50 and the axial force column 10.

  In the case where the recess 60 is formed in the horizontal member 50, the column head 20 and the column base 20 are embedded by embedding an elastic body 100 having a substantially triangular cross section in the corners of the column head 20 and the column base 30, and driving concrete into the mold. Each of the column bases 30 can form an axial force column whose diameter is reduced toward the tip side. Moreover, when not forming the recessed part 60 in the horizontal member 50, what is necessary is just to use the formwork in which the column head 20 and the column base part 30 each reduce in diameter toward the front end side.

  Further, when the horizontal movement preventing muscle 90 is disposed, a sheath tube is embedded in each of the column head 20 and the column base 30, and the horizontal movement preventing muscle 90 is housed inside the sheath tube, whereby the column head 20 and the column. The adhesion between the leg 30 and the leveling prevention muscle 90 can be cut.

  As described above, even when the axial force column 10 is not precasted and is made on-site, the column head 20 and the column base 30 of the axial force column 10 are reduced in diameter toward the tip side. Therefore, as described above, the area that receives the axial force is smaller than that of the conventional head and column base structure of the axial force column, and when the building is deformed horizontally, the cracks are generated at both end corners of the axial force column. No crushing occurs.

DESCRIPTION OF SYMBOLS 10 Axial force column 20 Column head 30 Column base 40 Tapered surface 50 Horizontal member 60 Recess 70 Horizontal reinforcement 80 Axis extension 90 Horizontal movement prevention reinforcement 91 Holding hole 92 Insertion hole 93 Energizing member 100 Elastic body 110 Grout material 200 Conventional shaft Power pillar

Claims (4)

Reduce the diameter of the column head and column base of the axial force column toward the tip side.
Between the column head and the column base and the horizontal member, a horizontal movement prevention muscle is interposed, and the column head and the column base and the horizontal member are joined.
The structure of the stigma and pedestal of the axial force column characterized by this. The horizontal member is provided with a recess for inserting the column head and the column base,
An elastic body is disposed between the inner surface of the recess and the outer peripheral surface of the column head and the column base,
The stigma / pillar structure of an axial force column according to claim 1. The horizontal movement prevention muscle is attached to at least one of the column head and the column base and the horizontal member,
The stigma and pedestal structure of an axial force column according to claim 1 or 2.   The said axial force column is precast-ized, The stigma and pedestal structure of the axial force column of any one of Claims 1-3 characterized by the above-mentioned.

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