JP2016132948A - Connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure that reduces possibilities of a fall-out of a second member from a first member, due to destruction of first concrete between an inner peripheral surface of a hollow tubular part and a main reinforcement.SOLUTION: In a connection structure 1, a first member 10 includes a hollow tubular part 11 and first concrete 12 filled inside the hollow tubular part 11, and a second member 20 includes a main reinforcement 21 arranged inside the hollow tubular part 11, with an edge part passing through an opening edge, as well as a tie-hoop 22 arranged to surround the main reinforcement 21, and second concrete cast to cover a part of the main reinforcement 21 and the tie-hoop 22 that is not located inside the hollow tubular part 11. A fall-out prevention reinforcement 50 is provided from an outer peripheral part of the hollow tubular part 11 into the hollow tubular part 11, for preventing fall-out of the second member 20 from the first member 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a connection structure.

  2. Description of the Related Art Conventionally, a member (CFT column or the like, comprising: a steel hollow tubular portion having an open end at at least one end portion and first concrete filled in the hollow tubular portion. The construction method of the building using the 1st member ") is proposed (for example, refer to patent documents 1). Here, a reinforced concrete member (a precast concrete column (hereinafter referred to as “PCa column”), a column generated by on-site concrete (hereinafter referred to as “second member”) is connected to such a first member. For example, parts that are heavy, such as foundations, are made with CFT pillars to reduce the cost required for loading, and the pillars connected on the foundations Such a portion having a relatively small weight has been desired to be connected with the CFT column and the PCa column when it is desired to shorten the construction period by creating it with the PCa column.

JP 2012-136837 A

  Here, in such a construction method for connecting the first member and the second member, the second member is prevented from coming out of the first member when a tensile axial force acts on the second member. It was necessary to fix to the first member. As such a fixing method, there is a method of preventing the pull-out by inserting a main bar from the second member into the hollow tubular portion of the first member and attaching a plate nut to the tip of the main bar. Conceivable. However, there has been a possibility that a sufficient removal prevention effect may not be achieved only by means of such a plate nut. That is, when a tensile axial force acts on the second member, there is a possibility that shear splitting will occur due to the shear force applied to the concrete between the main bar and the inner peripheral surface of the hollow tubular portion, and the plate The nut may not be able to prevent such destruction. Therefore, there has been a demand for a connection structure that can reduce the possibility of the second member coming out of the first member.

  The present invention has been made in view of the above, and the second member comes out of the first member due to the destruction of the first concrete 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 that can reduce the possibility of being lost.

  In order to solve the above-described problems and achieve the object, the connection structure according to claim 1 is a connection structure for connecting a second member to an end portion of the first member, wherein the first member includes: A hollow tubular portion having an open end at at least one end thereof, and a first concrete filled in the hollow tubular portion, wherein the second member is the first member and the second member. The main bars arranged along the juxtaposed direction, and one end portion of the main bars arranged inside the hollow tubular portion through the opening end and surrounding the main bars, A shear reinforcement bar arranged along a direction orthogonal to the juxtaposed direction, and a second part that is placed so as to cover a portion of the main bar and the shear reinforcement bar that is not located inside the hollow tubular portion. Concrete, and the second portion than the end of the main bar. The Nkurito side position, the outer peripheral portion of the hollow tubular portion, the arrangement leading to the interior of the hollow tubular portion, said second member from said first member is provided with a preventing member escape to prevent that escape.

  A connection structure according to a second aspect is the connection structure according to the first aspect, wherein the pull-out prevention member is disposed at a position closer to the second concrete side than the shear reinforcement.

  The connection structure according to claim 3 is the connection structure according to claim 1 or 2, wherein the pull-out prevention member passes from the outer peripheral portion of the hollow tubular portion through the inside of the hollow tubular portion, It penetrates so that it may pass through the other point of the said outer peripheral part.

  A connection structure according to a fourth aspect is the connection structure according to any one of the first to third aspects, wherein the plurality of pull-out prevention members are arranged so as to be orthogonal to each other.

  The structure according to claim 5 is the connection structure according to any one of claims 1 to 4, wherein the structure protrudes in an inner peripheral portion of the hollow tubular portion toward an axial direction of the hollow tubular portion. A rib is provided, and the slip-out prevention member is disposed so as to contact 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 from the outer peripheral surface of the hollow tubular portion to the inside, the reaction force of the escape prevention member against the stress acting in the withdrawal direction causes the hollow tubular portion to It is possible to reduce the possibility that the second member comes out of the first member due to the destruction of the first concrete 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, it is possible to perform an extremely easy construction without the work on the inner peripheral surface of the hollow tubular portion, and it is possible to improve the workability. It becomes.

  According to the connection structure according to claim 2, the slip-out preventing member is arranged on the second concrete side with respect to the shear reinforcement, thereby preventing the slip-out reinforcement against the tensile axial force acting on the first concrete. Since the reaction force of the member is added, it is possible to further reduce the possibility that the second member will come out of the first member.

  According to the connection structure according to claim 3, the slip-out preventing member is penetrated from one point of the outer peripheral portion so as to pass through the inside of the hollow tubular portion and pass through the other point of the outer peripheral portion. By fixing both end portions of the tube to the hollow tubular portion, it is possible to improve the yield strength of the pull-out prevention member against the tensile axial force acting on the first concrete, and further reduce the possibility that the second member will slip out from the first member. It becomes possible to do.

  According to the connection structure of the fourth aspect, since the plurality of pull-out prevention members are orthogonal to each other, it is possible to prevent the second member from pulling out in multiple directions, and the second member is pulled out from the first member. It is possible to further reduce the possibility of being lost.

  According to the connection structure of the fifth aspect, since the slip-out preventing member is disposed so as to contact 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, it is possible to further reduce the possibility that the second member is pulled out from the first member due to the reaction force of the ribs.

It is a top view which shows the connection structure which concerns on embodiment of this invention. It is a front view which shows a connection structure. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a top 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 1st modification. It is a principal part enlarged view which shows the connection structure which concerns on a 2nd modification.

  DESCRIPTION OF EMBODIMENTS 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. Below, the structure of the connection structure which concerns on this Embodiment is demonstrated first, and the construction method of the said connection structure is demonstrated later on for every process later on.

(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 FIG. 1 and FIG. 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 an escape prevention bar 50. . In the following description, the XX ′ direction in each figure is the width direction (X direction is right, X ′ direction is left), and YY ′ direction is the depth direction (Y direction is forward, Y ′ direction). ) And the ZZ ′ direction are referred to as the height direction (the Z direction is upward and the Z ′ direction is downward). In addition, on the basis of an arbitrary point, the direction away from the axial center of the first member 10 or the second member 20 in the width direction or the depth direction (or a combination thereof) is “outside”, and the first member 10 or the second member The direction approaching the axis of the member 20 is referred to as “inside”.

(Configuration-first member)
The 1st member 10 is a 1st support member for supporting a building, Comprising: The 2nd 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. In the present embodiment, the hollow tubular portion 11 is disposed below the second member 20, and an open end is formed at the upper end. Yes. 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. However, in the present embodiment, the cross-sectional shape is a square ring, and the first concrete 12 is filled therein, whereby a CFT (Concrete Filled) is performed. Steel Tube) is formed into a steel tubular body constructed as a pillar. In addition, about the magnitude | size, thickness, and raw material of this hollow tubular part 11, you may determine suitably based on the yield strength requested | required. In addition, two diaphragms 30 (outer diaphragms) are welded to the outer peripheral part of the hollow tubular part 11 in a known manner, and a beam 40 is welded to these diaphragms 30.

  Here, a rib 13 that protrudes in 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 (in the present embodiment, a total of five ribs) are arranged in parallel along the height direction, and any of the ribs 13 is above a lower end portion of a main bar 21 described later. Placed in position. Here, each of these ribs 13 is configured in the same manner. Specifically, each of the ribs 13 abuts on the front surface, the rear surface, the right surface, and the left surface of the inner peripheral portion of the hollow tubular portion 11. Thus, it is formed as a frame-like body welded.

  The first concrete 12 is a first concrete filled in the hollow tubular portion 11. The first concrete 12 is placed inside the hollow tubular portion 11 so as to cover a main reinforcement 21, a band reinforcement 22, and the like of the second member 20, which will be described later. The two members 20 are connected to each other. In addition, since the structure and filling method of such a 1st concrete 12 are well-known, detailed description is abbreviate | omitted.

  The first member 10 can be arbitrarily configured as long as it includes 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. It doesn't matter. Moreover, it may be formed on any floor in the building, for example, it may be formed on the basic floor and may be formed integrally with the footing.

(Configuration-second member)
The 2nd member 20 is a 2nd support member for supporting a building, Comprising: The 1st 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. 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. In the present embodiment, the second member 20 The member 20 is assumed to be a prism, but may be a cylinder or other polygonal columns, for example. Moreover, although the 2nd member 20 shall be a well-known precast reinforced concrete column (PCa column (precast concrete column)) manufactured in advance in a factory etc. and then carried in to a construction site, it is manufactured with cast-in-place concrete. It doesn't matter.

  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 juxtaposed (the height direction in the present embodiment), and one end portion of the main reinforcing bar 21 is the first member 10. It is a reinforcing bar arranged inside the hollow tubular part 11 through the open end of the. 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 side by side along the height direction at the peripheral position of the second member 20, and most of the main bars 21 are mostly of the second member 20. A part of the second concrete 24 is fixed to the first concrete 12. The part of the second concrete 24 protrudes from the lower end of the second concrete 24 and is fixed to the first concrete 12 inside the hollow tubular portion 11.

  The band reinforcement 22 is a shear reinforcement bar arranged along a direction (in the present embodiment, the width direction or the depth direction) perpendicular to the juxtaposition direction so as to surround the main bar 21. The band 22 is a reinforcing bar for resisting the shear splitting fracture of the second member 20 and has a function of preventing the second member 20 from coming out of the first member 10. Here, specifically, a plurality of the strips 22 are arranged in parallel at equal intervals along the height direction, and most of the plurality of strips 22 are the second concrete 24. The remaining part of the reinforcing bar 22 is 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 known plate nut in which the plate portion and the nut portion are integrated with each other and screwed to the lower end portion of each main bar 21. In addition, since the structure and attachment method of this plate nut 23 are well-known, detailed description is abbreviate | omitted. Further, when the main bar 21 is sufficiently long and the second member 20 can be sufficiently fixed to the first member 10, the plate nut 23 may be omitted.

  The second concrete 24 is a second concrete that is placed so as to cover portions of the main reinforcement 21 and the band reinforcement 22 that are not located inside the hollow tubular portion 11. The placing method of the second concrete 24 is arbitrary. For example, a formwork may be arranged around the pre-arranged main reinforcement 21 and the band reinforcement 22 and the concrete may be poured into the formwork. I do not care. However, in the present embodiment, the description will be made assuming that the second concrete 24 is placed in advance so as to cover the main bar 21 and the band bar 22 at the factory, and these are integrally formed and carried into the construction site. In addition, since such a concrete placement method is publicly known, detailed description thereof is omitted.

  The second member 20 can be arbitrarily configured as long as it includes at least the main bars 21, the band bars 22, the plate nuts 23, and the second concrete 24 as described above, and will be described as a pillar in the present embodiment. However, it may be a beam. Moreover, you may form in any floor in a building.

(Configuration-Diaphragm)
The diaphragm 30 is a joining means that forms a joint between a column and a beam. The diaphragm 30 is a known outer diaphragm welded to the outer peripheral portion of the hollow tubular portion 11, and is arranged along the horizontal plane at two locations above and below the open end of the hollow tubular portion 11. In the present embodiment, the outer diaphragm type is used. However, a known inner diaphragm type or through diaphragm type may be used, 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 the building, and is welded to the diaphragm 30 and attached to the web plate by bolting. The beam 40 is assumed to be made of H-shaped steel, but a rebar or concrete may be placed so as to cover the beam 40 to form an SRC structure.

(Structure-Leaving prevention muscle)
The slip-out preventing bars 50 are arranged from the first member 10 to the second member at positions closer to the second concrete 24 than the lower ends of the main bars 21 from the outer peripheral part of the hollow tubular part 11 to the inside of the hollow tubular part 11. This is an escape prevention member that prevents the 20 from coming 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 preventing bars 50 are arranged near the opening end of the first member 10. Includes four escape prevention bars 50a inserted through the first member 10 along the depth direction, and four escape prevention bars 50b inserted through the first member 10 along the width direction. Here, each pull-out prevention bar 50 penetrates from one point of the outer peripheral portion of the hollow tubular portion 11 so as to pass through the inside of the hollow tubular portion 11 and pass through another point of the outer peripheral portion. The plurality of pull-out prevention bars 50 are arranged so as to be orthogonal to each other. It should be noted that the slip-out preventing bars 50a along the depth direction and the slip-out preventing bars 50b along the width direction are arranged at the upper and lower positions so that they do not cross each other at the same height inside the first member 10. It is inserted in a staggered manner. In addition, when it is not necessary to distinguish these slip-out preventing muscles 50a and the slip-out preventing muscles 50b from each other, they will be simply referred to as “the slip-out preventing muscles 50” and will be described below.

  Here, when such a pull-out preventing bar 50 is not provided, when a tensile axial force acts on the second member 20, a shearing force is applied to the first concrete 12 positioned between the rib 13 and the main bar 21. May be applied to cause shear splitting and the second member 20 may be pulled out of the first member 10. However, by providing the pull-out prevention bar 50 as in the present embodiment, the pull-out prevention bar 50 is located at a position between the rib 13 and the main bar 21 in a plan view. Can be prevented from being broken by shear splitting, and the second member 20 can be prevented from being pulled out from the first member 10.

  Here, the position in the height direction of the pull-out preventing bar 50 is arbitrary as long as the pull-out bar 50 has an effect of preventing the second member 20 from slipping out. Any position may be used as long as the position is closer to the second concrete 24 than the portion (in the present embodiment, the upper position). In addition, in order to obtain a higher pull-out prevention effect, a position on the second concrete 24 side (in the present embodiment, on the upper side) is more preferable than any one of the strips 22 and any one of the plate nuts 23. . For example, it may be inserted through a position slightly above the band 22 located at the lowermost end.

  Further, it is preferable that the position in the height direction of the escape preventing muscle 50 is determined in consideration of the ease of insertion of the escape preventing muscle 50. That is, when inserting the escape preventing muscle 50 into the hollow tubular portion 11, it is necessary to first form a hole in the hollow tubular portion 11, but the closer to the opening end in the hollow tubular portion 11, the closer to the opening end. Since it is possible to work at a shallow position while visually recognizing the inside of the hollow tubular portion 11, it is easy to form a hole. In consideration of this point, in the present embodiment, the slip-out preventing muscle 50 is inserted at a position only a few centimeters (for example, 3 centimeters) below the opening end.

  Further, the specific shape of the slip-out preventing muscle 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 has the shape shown in the present embodiment. It is not limited to reinforcing bars. For example, one end portion of the pull-out preventing muscle 50 is inserted into one point of the outer peripheral portion of the hollow tubular portion 11, and the other end portion does not penetrate the other point of the outer peripheral portion of the hollow tubular portion 11. A thing staying inside the hollow tubular portion 11 may be used. Further, the other end portion may be branched into a plurality of portions, curved or bent, or the thickness may be different at each end portion.

  Further, the material of the pull-out prevention bar 50 is arbitrary as long as it has resistance to the shearing force applied to the first concrete 12 described above, and is not limited to a hard member such as the reinforcing bar shown in the present embodiment. It may be an elastic member or the like.

  Further, a device for preventing the pull-out prevention muscle 50 itself from falling out of the hollow tubular portion 11 or being drawn into the hollow tubular portion 11 due to the force of earthquake motion or the like is applied. It is preferable to apply. For example, in the present embodiment, the nut 51 is fastened in the vicinity of each end portion of the slip-out preventing muscle 50 (a position outside the outer peripheral portion of the hollow tubular portion 11) to prevent such drop-out or pull-in. However, for example, it may be prevented by bending the end portion of the pull-out prevention bar 50.

(Construction method)
Then, the construction method of the connection structure 1 mentioned above is demonstrated.

(Construction method-hollow tubular part installation process)
First, a hollow tubular part installation process is performed. Specifically, first, a plurality of steel plates are joined together by welding or the like to form the hollow tubular portion 11, and the plurality of ribs 13 are welded to the inner surface of the hollow tubular portion 11 formed in this way. Next, a hole is formed in the vicinity of the opening end of the hollow tubular portion 11 for inserting the escape preventing muscle 50. At this time, in this embodiment, the slip-out preventing muscle 50 is inserted in the vicinity of the opening end, so that the work can be performed at a shallow position while 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 ribs 13 that are integrally formed in this way are installed at positions according to the design book.

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

(Construction method-slip-out prevention insertion process)
Next, a slip-out preventing muscle insertion step is performed. Specifically, the pull-out prevention bars 50 are inserted into the holes provided in the hollow tubular portion 11 described above, and the nuts 51 are fastened to the portions projecting outward from the outer peripheral portions of the hollow tubular portions 11 at both ends. The prevention muscle 50 is fixed. Such an operation is similarly performed with respect to each pull-out preventing muscle 50, and all the pull-out preventing bars 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 10 and the second member 20 are connected to each other by sending the first concrete 12 into the hollow tubular portion 11 by a pump or the like, filling it, and solidifying it. At this time, as described above, since the slip-out preventing muscle 50 is located between the rib 13 and the main muscle 21 in plan view, it can resist the shearing force applied to the position between the rib 13 and the main muscle 21. It is possible to prevent the second member 20 from being pulled out. In addition, since the concrete method of filling the inside of the hollow tubular part 11 with the 1st concrete 12 in this way is well-known, detailed description is abbreviate | omitted. The construction method according to the present embodiment is thus completed.

(Effect of embodiment)
As described above, according to the connection structure 1 of the present embodiment, the slip-out preventing muscle 50 is provided in an arrangement extending from the outer peripheral surface of the hollow tubular portion 11 to the inside, and therefore, the reaction of the slip-off preventing muscle 50 against the stress acting in the slip-out direction. To reduce the possibility that the second member 20 will come out of the first member 10 due to the first concrete 12 being destroyed between the inner peripheral surface of the hollow tubular portion 11 and the main reinforcement 21 due to the force. Is possible. Furthermore, since the pull-out preventing muscle 50 can be inserted through the outer peripheral surface of the hollow tubular portion 11, it is possible to perform an extremely easy construction in which the work on the inner peripheral surface of the hollow tubular portion 11 is omitted, and the workability is improved. Things will be possible.

  Further, by disposing the pull-out prevention bar 50 on the second concrete 24 side with respect to the band bar 22, the reaction force of the drop-off prevention bar 50 is added to the tensile axial force that the band bar 22 acts on the first concrete 12. Therefore, it is possible to further reduce the possibility that the second member 20 comes out of the first member 10.

  Moreover, since it penetrates so that it may pass through the inside of the hollow tubular part 11 from one point of an outer peripheral part, and the other point of an outer peripheral part, the both ends of the slip-out prevention muscle 50 are fixed with respect to the hollow tubular part 11. As a result, it is possible to improve the proof strength of the pull-out prevention bars 50 against the tensile axial force acting on the first concrete 12, and to further reduce the possibility that the second member 20 will slip out from the first member 10.

  Further, since the plurality of pull-out prevention bars 50 are orthogonal to each other, the second member 20 can be prevented from slipping out in multiple directions, and the possibility that the second member 20 slips out from the first member 10 is further reduced. It becomes possible to do.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. Can do. Hereinafter, such a modification 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 above contents, and may vary depending on the implementation environment and details of the configuration of the invention. May be solved, or only some of the effects described above may be achieved. For example, even if it is not possible to prevent the second member 20 from coming out of the first member 10 by the connection structure 1 according to the embodiment, or even if simple construction cannot be performed, a technique different from the conventional technique When the connection structure 1 can be constructed by the above, the problem of the present invention is solved.

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

(About slip-out prevention muscles)
In the present embodiment, it has been described that four escape prevention bars 50 are inserted along the depth direction and four along the width direction, and the vertical positions thereof are shifted from each other. 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 FIG. 4 and FIG. 5, it may be arranged so that the pull-out prevention bars 60 are located at the same height. Specifically, one escape prevention bar 60a that penetrates the hollow tubular part 11 along the depth direction and the same height as the escape prevention line 60a so as to extend from the outer peripheral part of the hollow tubular part 11 to the inside. Two slip-out preventing muscles 60b inserted into the two, and two slip-out preventing muscles 60b inserted from the left and right so that the tip does not contact the slip-out preventing muscle 60a are arranged. By configuring in this manner, the position of the hole in the depth direction and the position of the hole in the width direction can be made the same height, so that the positioning of the hole formed in the hollow tubular portion 11 can be facilitated. It becomes possible. At this time, the depth direction through which the escape prevention bar 60 penetrates has a higher effect of preventing the escape than the width direction. Therefore, in consideration of the direction in which the building is largely shaken based on the shape (longitudinal direction) of the building, it is more preferable that the penetration prevention bars 60 that penetrate through the building are arranged in a direction that requires a higher escape prevention effect.

  In the present embodiment, the slip-out preventing muscle 50 is disposed at a position above the rib 13, but is not limited thereto. FIG. 6 is an enlarged view of a main part showing the connection structure 3 according to the second modification. As shown in FIG. 6, the escape prevention bar 70 may be disposed so as to contact the lower surface of the rib 13. According to the connection structure 3 according to the present modification, the rib 13 is arranged so as to contact the surface on the opposite side of the second concrete 24 in the rib 13, so that the pull-out preventing muscle 70 against the tensile axial force acting in the pull-out direction is arranged. 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 will come out of the first member 10.

  In the present embodiment, the slip-out preventing muscle 50 is inserted in the direction from the outer peripheral portion of the hollow tubular portion 11 to the inside, but is not limited thereto, and is inserted in the direction from the inside of the hollow tubular portion 11 to the outer peripheral portion. It doesn't matter. However, in general, since the main bar 21 and the band bar 22 are arranged inside the hollow tubular part 11, there is a high possibility that the 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, it has been described that a total of five ribs 13 are provided, but the present invention is not limited to this. For example, a larger or smaller number of ribs 13 may be provided, or none of the ribs 13 may be provided.

(About diaphragms, web plates, and beams)
In the present embodiment, the diaphragm 30, the web plate, and the beam 40 are described as being provided. However, these may not be provided.

(Appendix)
The connection structure of Supplementary Note 1 is a connection structure in which a second member is connected to an end portion of a first member, and the first member includes a hollow tubular portion having an open end at at least one end portion, and A first concrete filled in a hollow tubular portion, wherein the second member is a main bar arranged along a parallel direction of the first member and the second member, A main reinforcing bar disposed inside the hollow tubular part through the opening end, and a shear reinforcing bar arranged along a direction orthogonal to the juxtaposed direction so as to surround the periphery of the main reinforcing bar And a second concrete that is 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, and the second concrete than the end portion of the main reinforcing bar. From the outer peripheral part of the hollow tubular part to the concrete side position, 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 of Supplementary Note 2 is the connection structure of Supplementary Note 1, wherein the pull-out prevention member is arranged at a position closer to the second concrete side than the shear reinforcement.

  The connection structure according to appendix 3 is the connection structure according to appendix 1 or 2, wherein the pull-out prevention member passes through the inside of the hollow tubular portion from one point on the outer peripheral portion of the hollow tubular portion. Pierce through other points.

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

  The structure according to appendix 5 is the connection structure according to any one of appendices 1 to 4, and includes a rib projecting in an axial direction of the hollow tubular portion on an inner peripheral portion of the hollow tubular portion, The pull-out prevention member is disposed so as to contact a surface of the rib opposite to the second concrete.

(Additional effects)
According to the connection structure described in appendix 1, since the escape prevention member is provided in an arrangement extending from the outer peripheral surface of the hollow tubular portion to the inside, the reaction force of the escape prevention member against the stress acting in the withdrawal direction causes the inside of the hollow tubular portion. It is possible to reduce the possibility that the second member comes out of the first member due to the destruction 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, it is possible to perform an extremely easy construction without the work on the inner peripheral surface of the hollow tubular portion, and it is possible to improve the workability. It becomes.

  According to the connection structure of Supplementary Note 2, the slip-out preventing member is arranged on the second concrete side with respect to the shear reinforcement, thereby preventing the slip-off from the tensile axial force that the shear reinforcement acts on the first concrete. Therefore, the possibility that the second member comes out of the first member can be further reduced.

  According to the connection structure described in appendix 3, the slip-out preventing member is penetrated from one point on the outer peripheral portion so as to pass through the inside of the hollow tubular portion and pass through another point on the outer peripheral portion. By fixing both end portions to the hollow tubular portion, it is possible to improve the yield strength of the pull-out prevention member against the tensile axial force acting on the first concrete, and further reduce the possibility that the second member will slip out from the first member. Things will be possible.

  According to the connection structure described in appendix 4, since the plurality of pull-out prevention members are orthogonal to each other, the second member can be prevented from being pulled out in multiple directions, and the second member is pulled out from the first member. The possibility can be further reduced.

  According to the connection structure described in appendix 5, the slip-out prevention member is disposed so as to contact the surface of the rib opposite to the second concrete, so that the reaction force of the slip-out prevention member against the tensile axial force acting in the pull-out direction can be reduced. By adding the reaction force of the rib, it is possible to further reduce the possibility that the second member will come out of the first member.

1, 2, 3 Connection structure 10 1st member 11 Hollow tubular part 12 1st concrete 13 Rib 20 2nd member 21 Main reinforcement 22 Band reinforcement 23 Plate nut 24 Second concrete 30 Diaphragm 40 Beams 50, 50a, 50b Leaving prevention reinforcement 51 Nut 60, 60a, 60b Breakout prevention muscle 70 Breakout prevention muscle

Claims (5)

A connection structure for connecting the second member to the end of the first member,
The first member is
A hollow tubular portion having an open end at at least one end;
A first concrete filled in the hollow tubular portion,
The second member is
A main bar arranged along the juxtaposition direction of the first member and the second member, one end part of which is arranged inside the hollow tubular part through the opening end;
A shear reinforcing bar arranged along a direction perpendicular to the juxtaposed direction so as to surround the periphery of the main bar;
A second concrete that is 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;
The second member comes out of the first member in an arrangement from the outer peripheral portion of the hollow tubular portion to the inside of the hollow tubular portion at a position closer to the second concrete than the end of the main bar. Provided with a slip-out prevention member to prevent this,
Connection structure. The escape prevention member is disposed at a position on the second concrete side with respect to the shear reinforcement,
The connection structure according to claim 1. The escape prevention member is
From one point of the outer peripheral part of the hollow tubular part, through the inside of the hollow tubular part, penetrate through the other point of the outer peripheral part,
The connection structure according to claim 1 or 2. A plurality of the escape prevention members are arranged so as to be orthogonal to each other.
The connection structure according to any one of claims 1 to 3. On the inner peripheral part of the hollow tubular part, provided with a rib protruding in the axial direction of the hollow tubular part,
The slip-out prevention member is disposed so as to contact the surface of the rib opposite to the second concrete,
The connection structure according to any one of claims 1 to 4.

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