JP6635657B2 - Connection structure - Google Patents

Description

  The present invention relates to a connection structure.

  Conventionally, a member (a CFT column or the like; hereinafter, referred to as a CFT column, etc.) including a steel hollow tubular portion having an open end at at least one end and a first concrete filled inside the hollow tubular portion. A construction method of a building using the “first member”) has been proposed (for example, see Patent Document 1). Here, a reinforced concrete member (precast concrete column (hereinafter, “PCa column”), a column made of cast-in-place concrete (hereinafter, “second member”) is connected to such a first member. For example, there was a demand to carry out construction.For example, heavy parts such as foundations were made of CFT pillars to reduce the cost required for carrying in, and to reduce the cost of the pillars connected on the foundation. When it is desired to shorten the construction period by creating such a relatively light weight part using a PCa column, a connection between the CFT column and the PCa column has been demanded.

JP 2012-136837 A

  Here, in such a method of connecting the first member and the second member, the second member is prevented from falling out of the first member when the tensile axial force acts on the second member. Needs to be fixed to the first member. As such a fixing method, there is a method in which a main bar is inserted from the second member to the inside of the hollow tubular portion of the first member, and a plate nut is attached to a tip of the main bar to prevent the main bar from coming off. Conceivable. However, there is a possibility that a sufficient slip-out preventing effect cannot be achieved only by such a device using the plate nut. That is, when a tensile axial force acts on the second member, there is a possibility that a shear force is applied to the concrete at a position between the main reinforcing bar and the inner peripheral surface of the hollow tubular portion to cause a shear splitting failure. There was a possibility that such breakage could not be prevented with a nut. Therefore, there has been a demand for a connection structure capable of reducing the possibility that the second member comes off from the first member.

  The present invention has been made in view of the above, and the second member comes off from the first member due to the first concrete being broken between the inner peripheral surface of the hollow tubular portion and the main reinforcement. It is an object of the present invention to provide a connection structure capable of reducing the possibility of occurrence.

In order to solve the above-described problem and achieve the object, a connection structure according to claim 1 is a connection structure that connects a second member to an end of a first member, wherein the first member is A hollow tubular part having an open end at at least one end, and a first concrete filled in the hollow tubular part, wherein the second member is configured to include the first member and the second member. A main reinforcement arranged along the juxtaposition direction, one end of which is disposed inside the hollow tubular portion through the open end, so as to surround the periphery of the main reinforcement, A second shear reinforcing bar arranged along a direction orthogonal to the juxtaposition direction and a second reinforcing bar which is arranged to cover a portion of the main reinforcing bar and the shear reinforcing bar which is not located inside the hollow tubular portion. Concrete, and the second reinforcement is larger than the end of the main reinforcement. At the position on the concrete side, a disengagement prevention member for preventing the second member from being dislodged from the first member is provided in an arrangement extending from the outer peripheral portion of the hollow tubular portion to the inside of the hollow tubular portion. , The second member is provided above the first member, and the escape prevention member passes through the inside of the hollow tubular portion from one point of the outer peripheral portion of the hollow tubular portion, and A first escape prevention streak that penetrates through another point, and a second escape prevention streak that does not penetrate from one point of the outer peripheral portion of the hollow tubular portion to the inside of the hollow tubular portion. The first escape prevention streaks and the second escape prevention streaks are orthogonal to each other and provided at the same height .

  In the connection structure according to a second aspect, in the connection structure according to the first aspect, the escape preventing member is disposed at a position closer to the second concrete than the shear reinforcement.

The structure according to claim 3 is the connection structure according to claim 1 or 2 , wherein the first member and the second member are members that form a pillar that supports a beam, and the first exit The preventing streaks are orthogonal to the beam, and the second escape preventing streaks are along the beam.
A structure according to a fourth aspect is the connection structure according to any one of the first to third aspects, wherein the structure protrudes from an inner peripheral portion of the hollow tubular portion toward an axial center direction of the hollow tubular portion. A rib is provided, and the escape preventing member is arranged so as to be in contact with a surface of the rib opposite to the second concrete.

  According to the connection structure of the first aspect, since the escape prevention member is provided in an arrangement extending from the outer peripheral surface to the inside of the hollow tubular portion, the reaction force of the escape prevention member with respect to the stress acting in the escape direction causes the hollow tubular portion to have a shape. It is possible to reduce the possibility that the second member comes off from the first member due to the first concrete being broken between the inner peripheral surface and the main reinforcement. Furthermore, since the slip-out prevention member can be inserted through the outer peripheral surface of the hollow tubular portion and constructed, the work on the inner peripheral surface of the hollow tubular portion can be performed extremely easily, and the workability can be improved. Becomes

  According to the connection structure of the second aspect, the slip-out preventing member is disposed closer to the second concrete side than the shear reinforcing bar, thereby preventing the shear reinforcing bar from slipping out with respect to the tensile axial force applied to the first concrete. Since the reaction force of the member is added, it is possible to further reduce the possibility that the second member comes off from the first member.

According to the connection structure of the fourth aspect, since the slip-out preventing member is arranged so as to be in contact with the surface of the rib opposite to the second concrete, the reaction force of the slip-out preventing member with respect to the tensile axial force acting in the pull-out direction. In addition, by applying the reaction force of the rib, it is possible to further reduce the possibility that the second member comes off from the first member.

It is a top view showing the connection structure concerning an embodiment of the invention. It is a front view which shows a connection structure. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 9 is a plan view showing a connection structure according to a first modification. It is a principal part enlarged view which shows the connection structure which concerns on a 1st modification. It is a principal part enlarged view which shows the connection structure which concerns on a 2nd modification.

  Hereinafter, embodiments of a connection structure according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited by this embodiment.

(Embodiment)
First, an embodiment will be described. Hereinafter, first, the configuration of the connection structure according to the present embodiment will be described, and then, a method of constructing the connection structure will be described step by step for each process.

(Constitution)
FIG. 1 is a plan view showing a connection structure 1 according to the present embodiment, and FIG. 2 is a front view showing the connection structure 1. As shown in FIGS. 1 and 2, the connection structure 1 according to the present embodiment includes a first member 10, a second member 20, a diaphragm 30, a beam 40, and a slip-off preventing streak 50. . In the following description, the XX ′ direction in each figure is defined as the width direction (the X direction is rightward, the X ′ direction is leftward), and the YY ′ direction is defined as the depth direction (the Y direction is forward, the Y ′ direction). Is referred to as a rear direction), and the ZZ ′ direction is referred to as a height direction (the Z direction is upward, and the Z ′ direction is downward). In addition, the direction away from the axis of the first member 10 or the second member 20 in the width direction or the depth direction (or a combination thereof) with respect to an arbitrary point is “outside”, and the first member 10 or the second member 20 is different. The part approaching the axis of the member 20 is referred to as “inside”.

(Configuration-First Member)
The first member 10 is a first support member for supporting a building, and a second member 20 is connected to an upper end. The first member 10 includes a hollow tubular portion 11 and a first concrete 12.

  The hollow tubular portion 11 is a hollow tubular body having an open end at at least one end, and is arranged below the second member 20 in the present embodiment, and has an open end formed at an upper end. I have. Here, the hollow tubular portion 11 can be formed into an arbitrary hollow tubular body as long as the first concrete 12 can be filled therein. For example, the hollow tubular portion 11 may be a hollow cylindrical body, but in the present embodiment, the cross-sectional shape is a square ring, and the first concrete 12 is filled in the inside to form a CFT (Concrete Filled). Steel Tube) is formed into a steel tubular body constructed as a pillar. Note that the size, thickness, and material of the hollow tubular portion 11 may be appropriately determined based on the required proof stress. In addition, two diaphragms 30 (outer diaphragms) are welded to the outer peripheral portion of the hollow tubular portion 11 vertically by a known method, and a beam 40 is welded to these diaphragms 30.

  Here, a rib 13 protruding toward the axial direction of the hollow tubular portion 11 is formed on the inner peripheral portion of the hollow tubular portion 11. A plurality of ribs 13 (five in this embodiment) are arranged at equal intervals along the height direction, and any of the ribs 13 is located above a lower end of a main bar 21 described later. Is located in the position. Here, each of these ribs 13 has the same configuration, and specifically, each of the ribs 13 contacts the front, rear, right, and left surfaces of the inner peripheral portion of the hollow tubular portion 11. As a welded frame.

  The first concrete 12 is a first concrete filled in the hollow tubular portion 11. The first concrete 12 is cast inside the hollow tubular portion 11 so as to cover a main bar 21 and a band bar 22 of a second member 20 to be described later. The two members 20 are interconnected. Since the configuration and the filling method of the first concrete 12 are known, detailed description is omitted.

  The first member 10 can be arbitrarily configured as long as it has at least the hollow tubular portion 11 and the first concrete 12 as described above. In the present embodiment, the first member 10 is described as being a pillar, but is a beam. No problem. Further, it may be formed on any floor of the building, for example, it may be formed on the base floor and may be formed integrally with the footing.

(Configuration-second member)
The second member 20 is a second support member for supporting a building, and the first member 10 is connected to a lower end. The second member 20 includes a main bar 21, a band bar 22, a plate nut 23, and a second concrete 24. Note that the second member 20 is arbitrary as long as it has a shape connectable to the first member 10, and may have a cross-sectional shape different from that of the first member 10. The member 20 is a prism, but may be, for example, a cylinder or another polygonal prism. The second member 20 is a well-known precast reinforced concrete column (PCa column (precast concrete column)) that is manufactured in advance in a factory or the like and then carried into a construction site, but is manufactured using cast-in-place concrete. It may be something.

  The main reinforcing bar 21 is a reinforcing bar arranged along the direction in which the first member 10 and the second member 20 are arranged side by side (in the present embodiment, in the height direction), and one end of the main reinforcing bar 21 is connected to the first member 10. Is a reinforcing bar disposed inside the hollow tubular portion 11 through an open end of the reinforcing member. The main bar 21 is configured as a known column main bar that bears the vertical force of the second member 20 and the horizontal force and bending moment of the beam 40. Here, specifically, a plurality of the main bars 21 are arranged in parallel along the height direction at the position of the peripheral edge of the second member 20. It is fixed inside the second concrete 24, a part thereof projects from the lower end of the second concrete 24, and is fixed to the first concrete 12 inside the hollow tubular portion 11.

  The stirrups 22 are shear reinforcing bars that are arranged along a direction (in the width direction or the depth direction in the present embodiment) orthogonal to the juxtaposition direction so as to surround the periphery of the main streaks 21. The band 22 is a reinforcing bar for resisting shear splitting fracture of the second member 20 and a function of preventing the second member 20 from coming off the first member 10. Here, specifically, a plurality of the stirrups 22 are arranged at equal intervals along the height direction, and most of the plurality of stirrups 22 are formed of the second concrete 24. The remaining stirrups 22 are fixed inside, and are fixed to the first concrete 12 inside the hollow tubular portion 11.

  The plate nut 23 is a fixing member for fixing the main bar 21 to the first concrete 12. The plate nut 23 is a well-known plate nut in which the plate portion and the nut portion are integrated with each other by being screwed to the lower end portion of each main bar 21. Since the configuration and mounting method of the plate nut 23 are known, detailed description thereof is omitted. When the main bar 21 is sufficiently long and the second member 20 is sufficiently fixed to the first member 10, the plate nut 23 may be omitted.

  The second concrete 24 is a second concrete that is cast so as to cover portions of the main reinforcement 21 and the strip reinforcement 22 that are not located inside the hollow tubular portion 11. The method of placing the second concrete 24 is arbitrary. For example, a form may be arranged around the main reinforcement 21 and the band reinforcement 22 arranged in advance, and the concrete may be poured into the form and poured. I do not care. However, in the present embodiment, a description will be given assuming that the second concrete 24 is cast in advance so as to cover the main reinforcement 21 and the strip reinforcement 22 at the factory, these are integrally formed, and are then carried into the construction site. It is to be noted that such a method of placing concrete is publicly known, and a detailed description thereof will be omitted.

  The second member 20 can be arbitrarily configured as long as it includes at least the main bar 21, the strip bar 22, the plate nut 23, and the second concrete 24, and in the present embodiment, the second member 20 will be described as a pillar. However, it may be a beam. Further, it may be formed on any floor of the building.

(Configuration-Diaphragm)
The diaphragm 30 is a joining unit that forms a joint between the column and the beam. The diaphragm 30 is a known outer diaphragm welded to the outer peripheral portion of the hollow tubular portion 11, and is disposed at two upper and lower positions near an opening end of the hollow tubular portion 11 along a horizontal plane. In the present embodiment, the outer diaphragm type is used, but a known inner diaphragm type, a through diaphragm type, or a non-diaphragm type without the diaphragm 30 may be used. A web plate is interposed between the upper and lower diaphragms 30, and the web plate is connected to the web of the beam 40.

(Configuration-Beam)
The beam 40 is a support member for supporting a building, and is welded to the diaphragm 30 and attached to the web plate by bolting. The beam 40 is made of H-shaped steel. However, an SRC structure may be used by casting a reinforcing bar or concrete so as to cover the beam 40.

(Structure-escape prevention line)
The escape preventing reinforcement 50 is disposed at a position closer to the second concrete 24 than the lower end of the main reinforcement 21, from the outer peripheral portion of the hollow tubular portion 11 to the inside of the hollow tubular portion 11, and from the first member 10 to the second member. This is a slip-out preventing member for preventing the slip-out 20 from slipping out. FIG. 3 is an enlarged view of a main part of FIG. In FIG. 3, illustration of the diaphragm 30, the web plate, and the beam 40 is omitted. As shown in FIG. 3 and FIG. 1 described above, a plurality (eight in the present embodiment) of the escape prevention streaks 50 are arranged near the opening end of the first member 10. Is provided with four escape prevention streaks 50a inserted through the first member 10 along the depth direction and four escape prevention streaks 50b inserted through the first member 10 along the width direction. Here, each of the escape preventing streaks 50 penetrates from one point of the outer peripheral portion of the hollow tubular portion 11, passes through the inside of the hollow tubular portion 11, and passes through another point of the outer peripheral portion. The plurality of escape prevention streaks 50 are arranged so as to be orthogonal to each other. Note that the escape prevention streaks 50a along the depth direction and the escape prevention streaks 50b along the width direction are vertically positioned so as not to cross each other at the same height inside the first member 10. It is inserted with a shift. In addition, when it is not necessary to distinguish the escape prevention streaks 50a and the escape prevention streaks 50b from each other, the escape prevention streaks 50a will be simply referred to as “the escape prevention streaks 50” and will be described below.

  Here, in the case where the escape preventing streaks 50 are not provided, when a tensile axial force acts on the second member 20, the shear force is applied to the first concrete 12 located between the rib 13 and the main streaks 21. Is added and the shear splitting fracture occurs, and the second member 20 may be pulled out from the first member 10. However, by providing the escape prevention streaks 50 as in the present embodiment, the escape prevention streaks 50 are located at positions between the ribs 13 and the main streaks 21 in plan view. Can be prevented from being sheared and fractured, and the second member 20 can be prevented from being pulled out of the first member 10.

  Here, the position of the escape preventing streaks 50 in the height direction is arbitrary as long as the escape preventing streaks 50 are at a position where the effect of preventing the second member 20 from coming out is provided. It does not matter if the position is on the second concrete 24 side of the part (the position on the upper side in the present embodiment). In order to obtain a higher effect of preventing slipping out, a position on the second concrete 24 side (an upper position in the present embodiment) is more preferable than any of the straps 22 or any of the plate nuts 23. . For example, it may be inserted at a position slightly above the streak 22 located at the lowermost end.

  Further, it is preferable that the position in the height direction of the escape prevention streaks 50 be determined in consideration of the ease of insertion of the escape prevention streaks 50. That is, when inserting the escape prevention streaks 50 into the hollow tubular portion 11, it is necessary to first form a hole in the hollow tubular portion 11. Since the work can be performed at a shallow position while visually checking the inside of the hollow tubular portion 11, a hole is easily formed. In consideration of this point, in the present embodiment, the escape prevention streak 50 is inserted at a position just a few centimeters (for example, 3 cm) below the opening end.

  Further, the specific shape of the escape preventing streak 50 is arbitrary as long as it is provided in an arrangement extending from the outer peripheral portion of the hollow tubular portion 11 to the inside of the hollow tubular portion 11, and the shape shown in the present embodiment is not limited. Not limited to rebar. For example, one end of the escape prevention streak 50 is inserted into one point of the outer peripheral part of the hollow tubular part 11, and the other end does not penetrate another point of the outer peripheral part of the hollow tubular part 11. Alternatively, the one that remains inside the hollow tubular portion 11 may be used. Further, the other end may be branched, curved, or bent, or may have a different thickness at each end.

  Further, the material of the escape preventing streaks 50 is arbitrary as long as it has a resistance to the shearing force applied to the first concrete 12 described above, and is not limited to a hard member such as a reinforcing bar shown in the present embodiment, for example, An elastic member or the like may be used.

  In addition, a device for preventing the slip-out preventing muscle 50 itself from falling out of the hollow tubular portion 11 or being drawn into the hollow tubular portion 11 due to the action of the force due to the seismic motion or the like. It is preferable to apply. For example, in the present embodiment, the nut 51 is fastened to the vicinity of each end of the escape prevention streak 50 (at a position outside the outer peripheral portion of the hollow tubular portion 11) to prevent such falling-off and pull-in. However, the prevention may be achieved by, for example, bending the end of the escape prevention streak 50.

(Construction method)
Next, a method of applying the above-described connection structure 1 will be described.

(Construction method-hollow tubular part installation process)
First, a hollow tubular portion installation step is performed. Specifically, first, a plurality of steel plates are joined by welding or the like to form a hollow tubular portion 11, and a plurality of ribs 13 are welded to the inner surface of the hollow tubular portion 11 formed as described above. Next, a hole is formed near the opening end of the hollow tubular portion 11 for inserting the escape prevention streak 50. At this time, in the present embodiment, since the escape preventing streaks 50 are inserted near the opening end, the work can be performed at a shallow position while visually observing the position where the hole is formed from the opening end, and the construction is easy. Next, the hollow tubular portion 11 and the rib 13 thus integrally formed are installed at the positions according to the design document.

(Construction method-2nd member installation process)
Next, a second member installation step is performed. Specifically, a plate nut 23 is attached to the main reinforcement 21 of the second member 20 formed in a factory or the like by integrating the main reinforcement 21, the band reinforcement 22, and the second concrete 24, and these integral members are attached to the above-described member. It is placed on the hollow tubular part 11 set in the hollow tubular part setting step. At this time, the main bars 21 and the band bars 22 are arranged so that the portions projecting from the second concrete 24 are accommodated in the hollow tubular portion 11.

(Construction method-escape prevention streaks insertion process)
Next, a slip-out preventing muscle insertion step is performed. Specifically, the escape prevention streaks 50 are inserted into the holes provided in the hollow tubular portion 11 described above, and the nuts 51 are fastened to portions protruding outward from the outer peripheral portions of the hollow tubular portions 11 at both ends, so that the escape is achieved. The prevention line 50 is fixed. Such an operation is similarly performed for each of the escape prevention streaks 50, and all the escape prevention streaks 50 are fixed to the hollow tubular portion 11.

(Construction method-1st concrete filling process)
Next, a first concrete filling step is performed. Specifically, the first member 12 and the second member 20 are connected to each other by feeding and solidifying the first concrete 12 into the hollow tubular portion 11 by a pump or the like and solidifying the first concrete 12. At this time, as described above, the escape preventing streaks 50 are located between the ribs 13 and the main bars 21 in a plan view, so that it is possible to resist the shearing force applied to the position between the ribs 13 and the main bars 21, It is possible to prevent the second member 20 from being pulled out. Since a specific method of filling the inside of the hollow tubular portion 11 with the first concrete 12 is known, a detailed description thereof is omitted. Thus, the construction method according to the present embodiment is completed.

(Effects of Embodiment)
As described above, according to the connection structure 1 of the present embodiment, the slip-out preventing muscles 50 are provided in an arrangement extending from the outer peripheral surface of the hollow tubular portion 11 to the inside thereof. To reduce the possibility that the second member 20 comes out of the first member 10 due to the force breaking the first concrete 12 between the inner peripheral surface of the hollow tubular portion 11 and the main reinforcement 21. Becomes possible. Furthermore, since the escape prevention streaks 50 can be inserted through the outer peripheral surface of the hollow tubular portion 11 and can be installed, it is possible to perform extremely easy installation without omitting work on the inner peripheral surface of the hollow tubular portion 11 and improve the workability. Things become possible.

  In addition, by arranging the escape prevention streaks 50 closer to the second concrete 24 than the stirrups 22, the reaction force of the escape prevention streaks 50 is added to the tensile axial force applied by the straps 22 to the first concrete 12. Therefore, it is possible to further reduce the possibility that the second member 20 comes off from the first member 10.

  In addition, since it penetrates from one point of the outer peripheral portion through the inside of the hollow tubular portion 11 and passes through another point of the outer peripheral portion, both ends of the escape preventing streak 50 are fixed to the hollow tubular portion 11. As a result, the strength of the pull-out preventing streaks 50 against the tensile axial force acting on the first concrete 12 can be improved, and the possibility of the second member 20 falling out of the first member 10 can be further reduced.

  In addition, since the plurality of escape preventing streaks 50 are orthogonal to each other, it is possible to prevent the second member 20 from coming out in multiple directions, and to further reduce the possibility that the second member 20 comes out of the first member 10. It is possible to do.

[Modification to Embodiment]
As described above, the embodiment according to the present invention has been described. However, the specific configuration and means of the present invention may be arbitrarily modified and improved within the technical idea of each invention described in the claims. Can be. Hereinafter, such modified examples will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the contents described above, and may differ depending on the implementation environment and details of the configuration of the invention. May be solved, or only a part of the effects described above may be achieved. For example, even when the connection structure 1 according to the embodiment cannot prevent the second member 20 from slipping out of the first member 10 or when simple construction cannot be performed, a technology different from the related art is used. When the connection structure 1 can be constructed by the above, the problem of the present invention has been solved.

(About dimensions and materials)
The dimensions, shapes, ratios, materials, and the like of each part of the connection structure 1 described in the detailed description of the invention and the drawings are merely examples, and may be other arbitrary dimensions, shapes, ratios, materials, and the like.

(About the stray prevention line)
In the present embodiment, four escape prevention streaks 50 are inserted along the depth direction and four escape prevention streaks are inserted along the width direction. I can't. FIG. 4 is a plan view showing the connection structure 2 according to the first modification, and FIG. 5 is an enlarged view of a main part showing the connection structure 2 according to the first modification. As shown in FIGS. 4 and 5, the escape preventing streaks 60 may be arranged at the same height. Specifically, one escape prevention streak 60a penetrating the hollow tubular portion 11 along the depth direction, and from the outer peripheral portion of the hollow tubular portion 11 to the inside at the same height as the escape prevention streak 60a. , And the two escape prevention streaks 60b inserted from the left and right so that the tips do not contact the escape prevention streaks 60a. With this configuration, the position of the hole in the depth direction and the position of the hole in the width direction can be set to the same height, so that the positioning of the hole formed in the hollow tubular portion 11 can be facilitated. It becomes possible. In this case, the effect of preventing escape is greater in the depth direction through which the escape prevention streaks 60 penetrate than in the width direction. For this reason, it is more preferable to consider the direction in which the building shakes greatly based on the shape (longitudinal direction) of the building or the like, and to arrange the penetrating escape prevention streaks 60 in a direction requiring a higher escape prevention effect.

  In the present embodiment, the escape preventing streak 50 is arranged at a position above the rib 13, but is not limited to this. FIG. 6 is an enlarged view of a main part showing a connection structure 3 according to a second modification. As shown in FIG. 6, the escape preventing streak 70 may be arranged so as to be in contact with the lower surface of the rib 13. According to the connection structure 3 according to the present modification, since the rib 13 is disposed so as to be in contact with the surface of the rib 13 on the side opposite to the second concrete 24, the slip-out preventing streaks 70 against the tensile axial force acting in the pull-out direction are provided. By adding the reaction force of the rib 13 to the reaction force, it is possible to further reduce the possibility that the second member 20 comes off from the first member 10.

  In the present embodiment, the escape preventing streaks 50 are inserted in the direction from the outer peripheral portion of the hollow tubular portion 11 to the inside. No problem. However, in general, since the main bar 21 and the band bar 22 are arranged inside the hollow tubular portion 11, there is a high possibility that a work space cannot be secured. It is preferable to insert in the direction from the part to the inside.

(About ribs)
In the present embodiment, a description has been given assuming that a total of five ribs 13 are provided, but the present invention is not limited to this. For example, more or less ribs 13 may be provided, and no rib 13 may be provided.

(About diaphragm, web plate and beam)
In the present embodiment, the description has been made assuming that the diaphragm 30, the web plate, and the beam 40 are provided, but these may be omitted.

(Note)
The connection structure according to Supplementary Note 1, wherein the connection structure connects the second member to an end of the first member, wherein the first member has a hollow tubular portion having an open end at at least one end; A first concrete filled in the hollow tubular portion, wherein the second member is a main reinforcement arranged along a direction in which the first member and the second member are arranged side by side, and A main reinforcing bar having an end portion disposed inside the hollow tubular portion through the open end, and a shear reinforcing bar disposed along a direction orthogonal to the juxtaposition direction so as to surround the main reinforcing bar. And a second concrete placed so as to cover a portion of the main reinforcing bar and the shear reinforcing bar that is not located inside the hollow tubular portion. At the position on the concrete side, from the outer peripheral portion of the hollow tubular portion, Serial internally throughout placement of the hollow tubular portion, provided with an exit preventing member to prevent that exit said second member from said first member.

  The connection structure according to Supplementary Note 2 is the connection structure according to Supplementary Note 1, wherein the escape prevention member is disposed at a position closer to the second concrete than the shear reinforcement.

  The connection structure according to Supplementary Note 3, wherein in the connection structure according to Supplementary Note 1 or 2, the escape prevention member passes through the inside of the hollow tubular portion from one point of the outer circumferential portion of the hollow tubular portion, and is connected to the outer circumferential portion. Penetrate through other points.

  The connection structure according to Supplementary Note 4 is the connection structure according to any one of Supplementary Notes 1 to 3, wherein the plurality of escape prevention members are arranged to be orthogonal to each other.

  The structure according to Supplementary Note 5 in the connection structure according to any one of Supplementary Notes 1 to 4, further including a rib protruding in an axial direction of the hollow tubular portion on an inner peripheral portion of the hollow tubular portion, The slip-out preventing member was disposed so as to be in contact with a surface of the rib opposite to the second concrete.

(Effect of additional notes)
According to the connection structure described in Supplementary Note 1, since the escape prevention member is provided in an arrangement extending from the outer peripheral surface to the inside of the hollow tubular portion, the inside of the hollow tubular portion is formed by a reaction force of the escape prevention member against the stress acting in the escape direction. It is possible to reduce the possibility that the second member comes off from the first member due to the breakage of the first concrete between the peripheral surface and the main reinforcement. Furthermore, since the slip-out prevention member can be inserted through the outer peripheral surface of the hollow tubular portion and constructed, the work on the inner peripheral surface of the hollow tubular portion can be performed extremely easily, and the workability can be improved. Becomes

  According to the connection structure described in Supplementary Note 2, the slip-out preventing member is disposed closer to the second concrete side than the shear reinforcing bar, whereby the shear-out reinforcing bar is prevented from slipping out against the tensile axial force applied to the first concrete. Is applied, so that the possibility that the second member comes off from the first member can be further reduced.

  According to the connection structure described in Supplementary Note 3, the slip-out preventing member is penetrated from one point in the outer peripheral portion, through the inside of the hollow tubular portion, and through another point in the outer circumferential portion, so that the slip-out preventing member is By fixing both ends to the hollow tubular portion, the strength of the slip-off preventing member against the tensile axial force acting on the first concrete can be improved, and the possibility of the second member falling out of the first member is further reduced. Things become possible.

  According to the connection structure described in Supplementary Note 4, since the plurality of escape prevention members are orthogonal to each other, it is possible to prevent the second member from coming off in multiple directions, and the second member comes off from the first member. The possibility can be further reduced.

  According to the connection structure described in Supplementary Note 5, the slip-out preventing member is disposed so as to be in contact with the surface of the rib opposite to the second concrete, so that the slip-out preventing member has a reaction force against the tensile axial force acting in the pull-out direction. When the reaction force of the rib is applied, it is possible to further reduce the possibility that the second member comes off from the first member.

1, 2, 3 Connection structure 10 First member 11 Hollow tubular part 12 First concrete 13 Rib 20 Second member 21 Main bar 22 Strip bar 23 Plate nut 24 Second concrete 30 Diaphragm 40 Beam 50, 50a, 50b Prevention bar 51 Nuts 60, 60a, 60b Prevention bars 70

Claims (4)

A connection structure for connecting a second member to an end of the first member,
The first member includes:
A hollow tubular portion having an open end at at least one end,
A first concrete filled inside the hollow tubular portion,
The second member includes:
A main reinforcement arranged along the direction in which the first member and the second member are arranged side by side, one end of which is disposed inside the hollow tubular portion through the open end;
Shear reinforcement arranged along a direction orthogonal to the juxtaposition direction so as to surround the periphery of the main reinforcement,
A second concrete that is cast to cover a portion of the main reinforcement and the shear reinforcement that is not located inside the hollow tubular portion,
At a position closer to the second concrete side than the end of the main reinforcement, the second member comes off from the first member in an arrangement extending from the outer peripheral portion of the hollow tubular portion to the inside of the hollow tubular portion. There is an escape prevention member that prevents
The second member is provided above the first member ,
The escape prevention member,
From a point on the outer peripheral portion of the hollow tubular portion, through the inside of the hollow tubular portion, a first escape prevention streak that penetrates through another point on the outer peripheral portion,
From a point on the outer peripheral portion of the hollow tubular portion, a second escape prevention streak that does not penetrate to the inside of the hollow tubular portion,
The first escape prevention streaks and the second escape prevention streaks are orthogonal to each other, and are provided at the same height as each other.
Connection structure. The escape prevention member is arranged at a position closer to the second concrete than the shear reinforcement,
The connection structure according to claim 1. The first member and the second member are members that form a pillar that supports a beam,
The first escape prevention streaks are orthogonal to the beam,
The second escape prevention streak is along the beam,
The connection structure according to claim 1 . An inner peripheral portion of the hollow tubular portion includes a rib protruding in an axial direction of the hollow tubular portion,
The escape prevention member is disposed so as to be in contact with a surface of the rib opposite to the second concrete,
Connection structure according to any one of claims 1 to 3.

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