JP2016017335A - Joining structure and joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology on a joining structure capable of securing anchorage force, and also excellent in workability, in the joining structure of a steel frame reinforced concrete structure.SOLUTION: A joining structure of a steel frame reinforced concrete structure is provided for joining a linear first structure and a linear second structure for connecting the first structure, and in a steel frame of the second structure, a web of the steel frame is provided with a steel frame having a through-hole of passing a reinforcement of the first structure and the reinforcement of the first structure, and the reinforcement of the first structure comprises a linear reinforcement of passing an end part through the through-hole and an anchor reinforcement of including a linear lap area positioned on the opposite side of the linear reinforcement with the web as a reference and connected to the end part of the linear reinforcement by passing through the through-hole and a deformed anchor area of continuing with the lap area.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a joining structure and a joining method.

  There are various techniques as a joining structure or a joining method of a reinforced concrete (RC) structure or a steel reinforced concrete (SRC) structure. For example, in Patent Document 1, it was necessary to insert a reinforcing bar into a perforated part provided in a steel material, and to secure about 30 to 40 times the reinforcing bar diameter as the fixing length of the reinforcing bar to the column. Is disclosed. Patent Document 1 discloses that the fixing length can be made 10 times or less of the diameter of the reinforcing bar by strongly restraining the reinforcing bar in the concrete. In Patent Document 2, in order to improve the buckling strength of a steel reinforced concrete column, a perforated portion is formed in a steel web, and a U-shaped reinforcing bar formed in a U-shape is inserted into the perforated portion. From the side, the U-shaped reinforcing bars are inserted into the perforated part so that the U-shaped reinforcing bars overlap with each other, and the steel web is positioned in the center of the overlapping part, and close to the steel flange. Thus, it is disclosed that a U-shaped reinforcing bar is arranged so as to surround the flange. Patent Document 3 discloses that the reinforcing bars are inserted so that the ends of the reinforcing bars overlap with each other from the left and right of the perforated portion of the web steel plate in order to omit the welding operation of the joint portion of the reinforcing bars.

JP 2000-73496 A Japanese Patent No. 3943252 Japanese Patent No. 3611473

  For example, when joining a beam (small beam) of another SRC structure or a reinforced concrete structure (hereinafter simply referred to as RC structure) to a middle portion of a beam (large beam) of a steel reinforced concrete structure (hereinafter also referred to as SRC structure), If the upper end height of the girder is different from that of the girder, the main rebar of the girder (connection side) may interfere with the steel frame inside the girder (connection side). In this case, it is conceivable that the lower main bar of the small beam on which the compressive force mainly acts is bent and fixed to the concrete before the steel beam of the large beam. However, due to structural design reasons such as the upper main bar of the small beam where the tensile force mainly acts cannot sufficiently secure the fixing force, for example, the tensile force cannot be sufficiently transmitted to the concrete, a through hole is made in the steel web. In many cases, it is fixed to concrete through the main beam of the small beam. However, for example, it is difficult in terms of construction to pass a long reinforcing bar bent into an L shape through the through hole of the steel frame web.

  Such a problem is not limited to the joint structure of a large beam and a small beam. In such a steel reinforced concrete structure, there is a problem that a so-called cruciform joint, toe joint, T joint, L joint, cantilever joint including a case where there is a step in the vertical direction of the beam. This is widely applied to a joint structure in which structures such as beams, girders, and columns are joined together in a plan view or a cross-sectional view.

  In view of the above problems, the present invention is a structure for joining steel reinforced concrete structures in which structures are joined to each other, and can provide a technique related to a joined structure that can secure fixing force and is excellent in workability. Let it be an issue.

  In the present invention, in order to solve the above-mentioned problem, in a joining structure in which structures constituting a steel reinforced concrete structure are joined together, a steel web of the structure passes through a reinforcing bar of another structure connected to the structure. A hole was provided, and the reinforcing bar was passed through this through hole. In addition, the reinforcing bar that passes through the through hole is composed of a linear reinforcing bar that passes through the through hole and a deformed anchoring reinforcing bar that is inserted into the through hole from the opposite side of the linear reinforcing bar and connected to the linear reinforcing bar. It was.

  Specifically, the present invention is a joint structure of a steel reinforced concrete structure in which a linear first structure and a linear second structure to which the first structure is connected are joined. A steel frame of a structure, comprising: a steel frame having a through hole through which the reinforcing bar of the first structure passes, and a reinforcing bar of the first structure, wherein the reinforcing bar of the first structure is A straight rebar that passes through the through hole, and a straight line that is located on the opposite side of the linear rebar with respect to the web and that is connected to the end of the straight rebar through the through hole. And a fixing reinforcing bar including a deformed fixing region connected to the wrapping region.

According to the joint structure according to the present invention, the reinforcing bar of the first structure is constituted by a linear reinforcing bar and a fixing reinforcing bar. The fixing reinforcing bar is located on the opposite side of the linear reinforcing bar with respect to the steel web, and can be passed through the through hole of the steel web from the opposite side of the linear reinforcing bar. Therefore, for example, as the first structure, it is not necessary to pass a long reinforcing bar bent in an L shape through the through-hole of the web, so that workability is improved. Further, the end portion of the linear reinforcing bar of the first structure and the wrapping region of the fixing reinforcing bar are connected through the through hole of the steel web and are located in the concrete sandwiched between the flanges of the steel frame. Therefore, the reinforcing bar of the first structure is firmly fixed to the concrete. In particular, the fixing region of the fixing reinforcing bar is deformed, and when a tensile force acts on the linear reinforcing bar, the proportion of the tensile force in the same direction of the fixing reinforcing bar generated through the concrete in the lap region is increased. Can do. From the principle of action and reaction, the tensile force of the fixing reinforcing bar acts as a reaction force in the opposite direction to the tensile force acting on the linear reinforcing bar, that is, as a fixing force. The above relationship can be expressed as an expression as follows.
Tensile force acting on linear reinforcing bars = Tensile force generated on anchored reinforcing bars through the lap region + Compression force resisting web + Adhesive force on surrounding concrete

  The first structure and the second structure include columns, beams, girders, and the like. The joint structure according to the present invention is applied to joints where structures such as columns, beams, girders, etc. join, such as joints of so-called to-joints, T-joints, cantilevers, and L-joints. be able to. The joint structure according to the present invention can be applied to a structure including a steel frame in the second structure. In other words, the second structure is preferably made of SRC, but the first structure may be made of RC instead of SRC. The structure may be a civil engineering structure as well as a building structure.

  Here, in the joining structure according to the present invention, the fixing region may have a region protruding from the outer diameter of the linear wrap region. The supporting pressure for supporting concrete in the protruding region and the adhesion force adhering to the concrete act more strongly, and the reinforcing bars of the first structure can be firmly fixed to the concrete. Examples of the fixing reinforcing bar having the protruding region include an L-shaped fixing reinforcing bar and a J-shaped fixing reinforcing bar. The tip of the L-shaped fixing rebar may be further bent. In addition, a fixing reinforcing bar having a protruding region is connected to a fixing reinforcing bar having a shape whose outer diameter is larger than the outer diameter of the wrapping region, a plate, or the like, and the plate is outside the wrapping region. A shape protruding outward from the diameter is also included.

Further, in the joint structure according to the present invention, when the through hole is designed so that each of the linear reinforcing bar and the fixing reinforcing bar passes through one, the linear reinforcing bar, Among the fixed reinforcing bars, at least one of the reinforcing bars is designed to be smaller than the reference diameter, and at least one of the linear reinforcing bars and the fixing reinforcing bars is the through hole. A plurality of them may be passed through.

  By designing the through-holes to be smaller than the reference diameter, for example, the interval between the through-holes can be made narrower than before, and the degree of freedom of design such as the positions of the through-holes provided in the steel web is further improved. Since the number of reinforcing bars that can be passed through the through hole per web increases and the cross-sectional area of the reinforcing bars of the first structure can be increased, the reinforcing bars of the first structure can be firmly fixed to the concrete. . In addition, since the through hole can be designed to be smaller than the reference diameter, the cross-sectional defect of the steel frame can be reduced as compared with the case of using the reference diameter. In order to secure the tensile strength of the reinforcing bars, it is better to design so that the sum of the cross-sectional areas of multiple reinforcing bars (bundle bars) does not fall below the cross-sectional area of the originally designed reinforcing bars. Moreover, in order to ensure the adhesive strength of a reinforcing bar, it is better to design so that the sum of the circumferential lengths of the bundled bars does not fall below the circumferential length of the originally designed reinforcing bars.

  Here, the present invention can be specified as a joining method. That is, the present invention is a method for joining a steel reinforced concrete structure joining structure in which a linear first structure and a linear second structure to which the first structure is connected are joined. The structure is a steel frame of the second structure, and includes a steel frame having a through hole through which the reinforcing bar of the first structure passes through the web of the steel frame, and the reinforcing bar of the first structure, The reinforcing bar of one structure is located on the opposite side of the linear reinforcing bar with the end part passing through the through hole and the linear reinforcing bar with respect to the web, and the end of the linear reinforcing bar passes through the through hole. And a fixed reinforcing bar including a deformed fixing region connected to the wrapping region, and the fixing reinforcing bar from the opposite side of the linear reinforcing bar to the through hole. Through the end of the linear reinforcing bar and the linear ladder of the anchoring reinforcing bar. Connecting the region is a joining method.

  According to the joining method according to the present invention, for example, it is not necessary to pass a long reinforcing bar bent in an L shape instead of the first structure through the through hole of the steel web, so that workability is improved. Further, the end portion of the linear reinforcing bar and the lap region of the fixing reinforcing bar are connected through the through hole of the steel frame web, and are located in the concrete sandwiched between the flanges of the steel frame. Therefore, the reinforcing bar of the first structure can be firmly fixed on the concrete.

  ADVANTAGE OF THE INVENTION According to this invention, it is a joining structure of the steel frame reinforced concrete structure which structures join, Comprising: The technique regarding the joining structure which can ensure fixing force and was excellent in workability can be provided.

FIG. 1 is a perspective view of a multilayer building including a joint structure according to the first embodiment. FIG. 2 shows an example of a plan view of a multilayer building including the joint structure according to the first embodiment. FIG. 3 shows an enlarged view of the AA cross section of FIG. FIG. 4 shows a principle diagram of the joint structure according to the first embodiment. FIG. 5 shows a bonding method of the bonding structure according to the first embodiment. FIG. 6 shows a joint structure according to the second embodiment. FIG. 7 shows a joint structure according to the third embodiment. FIG. 8 shows an example of a fixing reinforcing bar according to the fourth embodiment. FIG. 9 shows the relationship between the through-hole of the web and the reinforcing bar to be inserted. FIG. 10 shows a total cross-sectional area, a total perimeter, a hole diameter, and the like in the case where a bundled line is used.

Next, a first embodiment of the present invention will be described with reference to the drawings. In the following first embodiment, an example of a steel reinforced concrete (SRC) multi-layered building will be described. The following description is an example, and the present invention is not limited to the following contents.

<First Embodiment>
<< Configuration of multi-layer building >>
FIG. 1 is a perspective view of a multilayer building including a joint structure according to the first embodiment. FIG. 2 shows an example of a plan view of a multilayer building including the joint structure according to the first embodiment. FIG. 3 shows an enlarged view of the AA cross section of FIG. In the figure, the steel frame and the reinforcing bar are illustrated in a simplified manner.

  The multi-layered building M is assumed to be a building structure such as an SRC apartment or commercial building, and is composed of a plurality of floors. In the following description, as shown in FIGS. 2 and 3, a column beam joint in which ends of a large beam 2 extending in the beam direction and a large beam 21 extending in the inter-beam direction are connected to a column (outer column) 1 extending in the vertical direction. An example of a joining structure 10 of a so-called G-shaped joint will be described.

  Note that the bonding structure 10 is not limited to the above. The joint structure 10 can be suitably used for a joint where beams, columns and beams, columns and girders, etc. are joined. Such a joint includes a joint where the uppermost beam and column are connected in a T shape (for example, a T-shaped joint), a joint where a large beam and a small beam are connected in a T shape, an outer column and a piece. Examples include a joint where a cantilever (such as a balcony) is connected in a T shape. In addition, the structure connected to the structure containing a steel frame should just be a structure containing a reinforcing bar, and may be either SRC structure or RC structure. Moreover, you may apply the joining structure 10 to a civil engineering structure other than a building structure.

  A large beam 2 (corresponding to the second structure of the present invention) extending in the girder direction has an H-shaped steel frame 3 disposed at the center, and a main beam (main reinforcing bar) 4 of the large beam extending in the girder direction around the steel frame 3 has a cross section. A plurality of beams are arranged at predetermined intervals inside the surface of the large beam 2 having a rectangular shape. The main beam 4 of the large beam extending in the girder direction is arranged so as to form a rectangle as a whole, and an annular stirrup 5 is arranged along the main beam 4 of the large beam extending in the beam direction. Deformed bars are used for the main bars 4 of the large beams extending in the girder direction. The diameter of the main bars 4 of the large beams extending in the girder direction and the interval between the main bars 4 are appropriately designed according to the multilayer building M. The diameter of the star wrap 5 and the interval between the star wraps 5 are also appropriately designed according to the multilayer building M.

The steel frame 3 according to the first embodiment is H-shaped as described above, and includes a rectangular web 33 and rectangular flanges 31 and 32 that are connected to both ends of the web 33 at right angles to the web 33. ing. The flanges 31 and 32 are opposed to each other. The web 33 is provided with two through holes 34 in the vertical direction through which a part of the main bar 40 of the large beam 21 (the first structure of the present invention) extending in the inter-beam direction. The through-hole 34 is circular and has a hole diameter through which the linear reinforcing bar 6 and the fixing reinforcing bar 7 constituting the main reinforcing bar 40 of the large beam 21 extending in the beam-to-beam direction pass. This hole diameter corresponds to the reference diameter of the present invention. For example, if the outermost diameter of the linear reinforcing bar 6 is D1 and the outermost diameter of the fixing reinforcing bar 7 is D2, the hole diameter φ of the through hole can be calculated by the following equation. α is a correction value for forming a gap between the hole diameter and the reinforcing bar, and can be set to 2 to 3 mm, for example. In the first embodiment, D1 = D2.
φ = D1 + D2 + α

The main beam 40 of the large beam extending in the beam-to-beam direction has a two-level bar at each of the upper and lower bars. The upper reinforcing bar 61 at the upper end and the lower reinforcing bar 61 at the lower end are both L-shaped and are arranged outside the steel frame 3 and inside the stirrup 5. Further, two reinforcing bars located between the upper reinforcing bar 61 of the upper end and the lower reinforcing bar 61 of the lower end, that is, the lower reinforcing bar of the upper end and the upper reinforcing bar of the lower end (the first structure of the present invention). (Corresponding to a reinforcing bar of the body) is composed of a linear reinforcing bar 6 and a fixing reinforcing bar 7 and is inserted into through-holes 34 which are drilled at intervals in the vertical direction. Both the linear reinforcing bar 6 and the fixing reinforcing bar 7 are deformed reinforcing bars. The end of the linear reinforcing bar 6 is passed through the through hole 34 and connected to the wrap region of the fixing reinforcing bar 7. A tie wire 8 is used for connection. The connection is made at two locations on the inner side (straight reinforcing bar side) and the outer side (fixed reinforcing bar side) with the web 33 as a reference. In the first embodiment, the fixing regions 71 of the fixing reinforcing bars 7 are arranged so as to face each other. However, the fixing regions 71 of the fixing reinforcing bars 7 are oriented in accordance with the flanges 31 and 32 of the steel frame 3, other reinforcing bars, or The fixing reinforcing bars 7 can be appropriately changed so as not to interfere with each other.

  The fixing reinforcing bar 7 has an L shape as a whole, and a fixing region that is bent to the web side so that a linear wrap region 72 and a region where the linear wrap region 72 is extended are parallel to the web 33. 71. The length of the wrap region 72 is designed to be slightly shorter than the width of the flanges 31 and 32. The length of the fixing region 71 is designed to be shorter than the interval between the flanges 31 and 32. As a result, the fixing reinforcing bar 7 is located in the concrete sandwiched between the flanges 31 and 32 of the steel frame 3.

  Here, FIG. 4 shows a principle diagram of the bonding structure according to the first embodiment. When a tensile force B is applied to a part of the main reinforcement 40 of the large beam extending in the beam-to-beam direction, that is, the wrap region 72 of the linear reinforcing bar 6 and the fixing reinforcing bar 7, around the wrap region 72 of the linear reinforcing bar 6 and the fixing reinforcing bar 7. A shearing force C acts. Further, a compressive force D acts between the lap region 72 of the linear reinforcing bar 6 and the fixing reinforcing bar 7 and the web 33. The compressive force D acts as a force E2 that is perpendicular to the web 1 and parallel to the force E1 by vector decomposition of the force. The E1 pushes the web itself in an out-of-plane direction and pushes the opposite concrete through the web. E2 pushes the flanges 31, 32. On the other hand, since the flanges 31 and 32 are fixed, they exert a reaction to push back the concrete. As a result, the fixing property between the concrete and the linear reinforcing bars 6 and the fixing reinforcing bars 7 is improved.

  Further, a supporting pressure F that compresses particularly strong concrete acts between the corner portion positioned between the wrap region 72 and the fixing region 71 and the web 33. Further, an adhesion force G acts on the fixing region 71. By the support pressure F and the adhesion force G acting, the fixing property with the linear reinforcing bar 6 and the fixing reinforcing bar 7 is further improved.

<< Join method >>
FIG. 5 shows an example of a bonding method of the bonding structure according to the first embodiment. The joining method described below can be performed in the reinforcing bar assembling process after the steel frame assembling process of the multilayer building M is completed. However, the drilling process may be performed before the steel frame assembly process.

  In the drilling process, through holes 34 are formed in the steel web 33. Note that the perforating step may be performed before the steel frame is assembled or may be performed after the steel frame is assembled. In the reinforcing bar insertion step, the main beam 4 of the large beam extending in the direction between the beams is inserted into the through hole 34. A straight reinforcing bar 6, which is a part of the main beam 40 of the large beam extending in the inter-beam direction in the through hole 34, is inserted into the through hole 34 from the inside so that the end portion protrudes outward. On the other hand, the fixing reinforcing bar 7 is inserted into the through hole 34 so that the end protrudes inward from the side opposite to the linear reinforcing bar 6 with respect to the web 33 of the steel frame 3. It should be noted that either the straight reinforcing bar 6 or the fixing reinforcing bar 7 may be inserted into the through-hole 34 first, but the connecting of the fixing reinforcing bar 7 becomes easier when the linear reinforcing bar 6 is inserted first.

  Next, in the binding step, the end portions of the linear reinforcing bars 6 and the wrap regions 72 of the fixing reinforcing bars 7 are overlapped, and are bound (connected) by the binding wires 8. In the first embodiment, the webs 33 of the steel frame 3 are bound at one place on each of the inner side and the outer side. As described above, the joining of the joining structure according to the first embodiment is completed. Thereafter, a mold assembly process, a concrete placing process, a deframe process, and the like are performed, and the multilayer building M is constructed in units of layers.

<< Effect >>
According to the joint structure 10 according to the first embodiment, a part of the main reinforcing bar 40 of the large beam extending in the inter-beam direction is constituted by the linear reinforcing bar 6 and the fixing reinforcing bar 7. The fixing reinforcing bar 7 is located on the opposite side of the linear reinforcing bar 6 with respect to the web 33 of the steel frame 3, and can pass through the through hole 34 of the steel web 33 from the opposite side of the linear reinforcing bar 6. For this reason, for example, it is not necessary to pass a long reinforcing bar bent in an L shape as the main reinforcing bar 40 of the large beam extending in the inter-beam direction, so that workability is improved. Further, the end portion of the linear reinforcing bar 6 and the wrap region 72 of the fixing reinforcing bar 7 are passed through the through hole 34 of the web 33 of the steel frame 3, and are bound (connected) by the binding wire 8, and the flanges 31 and 32 of the steel frame 3. Located in concrete sandwiched between. Therefore, among the main reinforcing bars 40 of the large beams extending in the inter-beam direction, in particular, the linear reinforcing bars 6 and the fixing reinforcing bars 7 are strongly fixed to the concrete. Furthermore, a particularly strong support pressure F acts between the corner portion located between the wrap region 72 and the fixing region 71 and the web 33 (see FIG. 4). Further, an adhesion force G acts on the fixing region 71 (see FIG. 4). By the support pressure F and the adhesion force G acting, the fixing property with the linear reinforcing bar 6 and the fixing reinforcing bar 7 is further improved.

Second Embodiment
FIG. 6 shows a joint structure according to the second embodiment. In addition, about the structure same as the junction structure which concerns on embodiment described previously, the same code | symbol is attached | subjected and description is omitted. In the second embodiment, as in the first embodiment, the joint structure is used for the beam-column joint. However, in the second embodiment, for example, a case where a step is provided on the floor is assumed. The beam length of the large beam 21 extending in the inter-beam direction is smaller than that in the second embodiment, and the upper end height of the beam is lower than that in the first embodiment. Designed for low position. Therefore, the upper rebar of the upper end of the second embodiment cannot be arranged outside the steel frame 3. Therefore, in the second embodiment, the two upper bars of the upper rebar are each constituted by a linear rebar 6 and a fixing rebar 7 and inserted into through holes 34 that are perforated at intervals in the vertical direction. Yes. In the second embodiment, the beam of the large beam 21 extending in the beam-to-beam direction is smaller than that of the second embodiment, so that the lower end bar 61 is not a double bar but a single bar. In the second embodiment, the fixing region 71 of the fixing reinforcing bar 7 is arranged so that the tip thereof points downward, but the direction of the fixing region 71 of the fixing reinforcing bar 7 is set to the flanges 31 and 32 of the steel frame 3. The other reinforcing bars or the fixing reinforcing bars 7 can be appropriately changed so as not to interfere with each other.

  As explained above, for example, when it is necessary to provide a step on the floor, the upper end height position of the large beam extending in the inter-beam direction is increased and the upper end bar is required to have a two-step bar. There are cases in which the second stage reinforcement cannot be arranged outside the steel frame. In the second embodiment, the upper streak of the second streak is allowed to pass through the web 33 so that the second streak can be arranged with respect to the upper streak. The two-stage reinforcing bar that penetrates the web 33 is constituted by the linear reinforcing bar 6 and the fixing reinforcing bar 7, and for example, a long reinforcing bar bent into an L shape is passed through the through hole of the web instead of the linear reinforcing bar 6. Since it is not necessary, the workability is improved. Further, the end portion of the linear reinforcing bar 6 and the wrap region 72 of the fixing reinforcing bar 7 are passed through the through hole 34 of the web 33 of the steel frame 3, and are bound (connected) by the binding wire 8, and the flanges 31 and 32 of the steel frame 3. Located in concrete sandwiched between. Therefore, a part of the main reinforcing bar 40 of the large beam extending in the inter-beam direction, that is, the linear reinforcing bar 6 and the fixing reinforcing bar 7 are firmly fixed to the concrete. In particular, a particularly strong supporting force F acts between the corner portion positioned between the wrap region 72 and the fixing region 71 and the web 33. Further, an adhesion force G acts on the fixing region 71. By the support pressure F and the adhesion force G acting, the fixing property with the linear reinforcing bar 6 and the fixing reinforcing bar 7 is further improved.

<Third Embodiment>
FIG. 7 shows a joint structure according to the third embodiment. In addition, about the structure same as the junction structure which concerns on embodiment described previously, the same code | symbol is attached | subjected and description is omitted. The third embodiment is different from the first embodiment and the second embodiment in that the joint structure is used for the joint between the beams, that is, the joint between the large beam 2 and the small beam 22. In the third embodiment, the upper bar of the main reinforcing bar of the small beam is configured by the linear reinforcing bar 6 and the fixing reinforcing bar 7, and is inserted into the through hole 34 drilled in the web 33. In addition, since the beam of the small beam 22 is smaller than the beam of the large beam 21, the bottom line is not a double line but a single line. Further, the lower beam 61 of the small beam is mainly subjected to a compressive force, and it is not necessary to consider the tensile force. Therefore, the lower beam 61 of the small beam does not penetrate the web 33 and is in front of the web 33. It is bent. In addition, although it arrange | positions so that the front-end | tip of the fixing area | region 71 of the fixing bar 7 of the upper rebar of a small beam may point below, the direction of the fixing area 71 of the fixing bar 7 is the flanges 31 and 32 of the steel frame 3, other It can change suitably so that it may not interfere with a reinforcing bar.

  As described above, in the third embodiment, the linear reinforcing bar 6 and the fixing reinforcing bar 7 constituting the upper end bars are penetrated through the web 33 at the joint portion between the large beam 2 and the small beam 22 extending in the spar direction. , It is possible to arrange the upper streak. The upper bar that penetrates the web 33 is constituted by the linear reinforcing bar 6 and the fixing reinforcing bar 7, so that it is not necessary to pass a long reinforcing bar bent into an L shape as a small beam through the through hole of the web. Improves. Further, the end portion of the linear reinforcing bar 6 and the wrap region 72 of the fixing reinforcing bar 7 are passed through the through hole 34 of the web 33 of the steel frame 3, and are bound (connected) by the binding wire 8, and the flanges 31 and 32 of the steel frame 3. Located in concrete sandwiched between. Therefore, a part of the main reinforcing bar 40 of the large beam extending in the inter-beam direction, that is, the linear reinforcing bar and the fixing reinforcing bar 7 are firmly fixed to the concrete. In particular, a particularly strong supporting force F acts between the corner portion positioned between the wrap region 72 and the fixing region 71 and the web 33. Further, an adhesion force G acts on the fixing region 71. By the support pressure F and the adhesion force G acting, the fixing property with the linear reinforcing bar 6 and the fixing reinforcing bar 7 is further improved.

<Fourth embodiment>
In the fourth embodiment, another shape of the fixing reinforcing bar will be described. FIG. 8 shows an example of a fixing reinforcing bar according to the fourth embodiment. In FIG. 8A, the fixing reinforcing bar 7a is constituted by a wrap region 72a and a fixing region 71a, and the fixing region 71a is constituted by a straight portion and a return portion that is folded at the tip thereof. In FIG. 8B, the fixing reinforcing bar 7b includes a wrap region 72b and a fixing region 71b, and the fixing region 71b has a U shape. In FIG. 8C, the fixing reinforcing bar 7c is constituted by a wrap region 72c and a fixing region 71c, and the fixing region 71c is formed by a plate connected so as to penetrate the linear region in the middle of the linear region. It is configured. In FIG. 8D, the fixing reinforcing bar 7d is configured by a wrap region 72d and a fixing region 71d, and the fixing region 71d is crushed so that the end of the wrap region 72d swells outward. In FIG. 8E, the fixing reinforcing bar 7e is constituted by a wrap area 72e and a fixing area 71e, and the fixing reinforcing bar 7e is constituted by a plate in which the fixing area 71e is connected to an end of the wrap area 72e.

  Even when the fixing reinforcing bar according to the fourth embodiment is used, if a tensile force B is applied to the wrap regions 72a, b, c, d, e of the linear reinforcing bar 6 and the fixing reinforcing bars 7a, b, c, d, e. As in the first embodiment, a shearing force acts around the wrap regions 72a, b, c, d, e of the linear reinforcing bars 6 and the fixing reinforcing bars 7. Further, a compressive force D acts between the linear reinforcing bars 6 and the wrap regions 72a, b, c, d, e of the fixing reinforcing bars 7a, b, c, d, e and the web (not shown). As a result, the fixing property between the concrete and the linear reinforcing bars 6 and the fixing reinforcing bars 7a, b, c, d, e is improved.

  In addition, particularly strong concrete is used between corners located between the wrap areas 72a, b, c, d, e and the fixing areas 71a, b, c, d, e and the web (not shown). The supporting pressure F to be compressed acts. Further, an adhesion force G acts on the fixing regions 71a, b, c, d, and e. By the support pressure F and the adhesion force G acting, the fixing property with the linear reinforcing bar 6 and the fixing reinforcing bars 7a, b, c, d, e is further improved.

<Fifth Embodiment>
In the fifth embodiment, a case will be described in which at least one of a linear reinforcing bar and a fixing reinforcing bar is formed by a binding bar, and the diameter of the through hole 34 drilled in the steel web 33 is made smaller.

  FIG. 9 shows the relationship between the through-hole of the web and the reinforcing bar to be inserted. FIG. 9A shows a case where one straight reinforcing bar 6 and one fixed reinforcing bar 7 are passed through the through hole 34. FIG. 9A is an aspect described in the first embodiment, for example, and the hole diameter in this case becomes the reference diameter of the original design.

  FIG. 9B shows a case where the number of linear reinforcing bars 6 is one and the fixing reinforcing bars 7 are bundled bars 7a and 7a formed by binding two reinforcing bars. By configuring the fixing reinforcing bar 7 with the bundling bars 7a and 7a, the hole diameter of the through hole 34a is smaller than the reference diameter indicated by the dotted line. In addition, since the tensile strength of a reinforcing bar can be calculated | required from the cross-sectional area of a reinforcing bar (for example, notarized cross-sectional area of a deformed reinforcing bar), the sum of the cross-sectional areas of the reinforcing bars constituting the bundled bars 7a and 7a is established in the original design. It is necessary to design so that it does not fall below the cross-sectional area of the reinforcing bar 6. Further, since the adhesion force of the reinforcing bars can be obtained from the circumferential length of the reinforcing bars (for example, the notarized circumferential length of the deformed reinforcing bars), the sum of the circumferential lengths of the reinforcing bars constituting the bundling bars 7a and 7a is the fixed reinforcing bar of the original design. It is necessary to design so as not to fall below the circumference of 7.

  In FIG. 9C, the linear reinforcing bar 6 and the fixing reinforcing bar 7 are both bundled reinforcing bars 6a and 7b in which two reinforcing bars are bundled, and the binding reinforcing bar 6a and the fixing reinforcing bar constituting the linear reinforcing bar 6 are combined. The case where the reinforcing bar diameter of the bundling bars 7b to be configured is the same is shown. By configuring the linear reinforcing bar 6 and the fixing reinforcing bar 7 as a bundled bar, the hole diameter of the through hole 34b is smaller than the reference diameter indicated by the dotted line. In addition, in order to ensure the tensile strength of the reinforcing bars, the sum of the cross-sectional areas of the reinforcing bars constituting the binding bars 6a and 7b is designed so as not to be lower than the cross-sectional areas of the linear reinforcing bars 6 and the fixing reinforcing bars 7 of the original design. There is a need. In addition, in order to ensure the adhesion of the reinforcing bars, it is necessary to design the sum of the peripheral lengths of the reinforcing bars constituting the bundled bars 6a and 7b so as not to be less than the peripheral lengths of the linear reinforcing bars 6 and the fixing reinforcing bars 7 of the original design. There is.

  In FIG. 9D, the linear reinforcing bar 6 is a binding bar 6a, 6b in which two reinforcing bars are bundled, the fixing reinforcing bar 7 is a binding bar 7a, 7b in which two reinforcing bars are bundled, and a linear shape. The case where the diameters of the binding bars 6a and 6b of the reinforcing bar 6 are made different and the diameters of the binding bars 7a and 7b of the fixing reinforcing bar are made different is shown. The diameters of the binding muscles 6a and 7a are the same, and the diameters of the binding muscles 6b and 7b are the same. By configuring as described above, the hole diameter of the through hole 34c is smaller than the reference diameter indicated by the dotted line. In order to secure the tensile strength of the reinforcing bars, the sum of the cross-sectional areas of the reinforcing bars 6a and 6b of the linear reinforcing bars 6 and the reinforcing bars 7a and 7b of the fixed reinforcing bars 7 is the linear shape of the original design. It is necessary to design so that it does not fall below the cross-sectional area of the reinforcing bar 6 and the fixed reinforcing bar 7. Further, in order to ensure the adhesion of the reinforcing bars, the sum of the circumferences of the reinforcing bars constituting the binding bars 6a and 6b of the linear reinforcing bar 6 and the binding bars 7a and 7b of the fixing reinforcing bar 7 is the linear reinforcing bar of the original design. 6 and the fixing rebar 7 must be designed so as not to fall below the circumference.

  Here, FIG. 10 shows a total cross-sectional area, a total perimeter, a hole diameter, and the like when a bundled line is used. In FIG. 10, on the left side, for each nominal diameter, the outermost diameter of the reinforcing bar, the cross-sectional area of the reinforcing bar, the circumferential length of the reinforcing bar, and the hole diameter of the through hole in the original design are shown. On the other hand, on the right side of FIG. 10, the total cross-sectional area, cross-sectional area ratio, total circumference of the bundle muscle, circumference ratio, and the bundle muscle for each bundle muscle when the bundle muscle is adopted are used. The hole diameter and the hole diameter ratio are shown. As shown in FIG. 9C, the binding bars “2-D10”, “2-D13”, “2-D16”, and “2-D19” are both linear reinforcing bars 6 and fixing reinforcing bars 7. A case is shown in which the reinforcing bars 6a and 7b are formed by binding the reinforcing bars of the book, and the reinforcing bars 6a and 6a constituting the linear reinforcing bars and the reinforcing bars 7b and 7b constituting the fixing reinforcing bars 7 have the same diameter. As shown in FIG. 9 (d), the binding bar “D13 + D16” is a binding bar 6a, 6b obtained by binding two reinforcing bars to a linear reinforcing bar 6 and a binding bar 7a including two fixing bars. 7b, the diameters of the binding bars 6a, 6b of the linear reinforcing bar 6 are made different, and the diameters of the binding bars 7a, 7b of the fixing reinforcing bar are made different. The diameters of the binding muscles 6a and 7a are the same, and the diameters of the binding muscles 6b and 7b are the same.

For example, in the original design, when the nominal diameter of the linear reinforcing bar 6 and the fixing reinforcing bar 7 is D16, the hole diameter of the through hole 34 is 38 mm.
Hole diameter = D (outer diameter) x 2 + α (interval)

On the other hand, when the bundled line (2-D13) is used, the hole diameter of the through hole 34b is 34 mm. r indicates the radius of the bunches 6a and 7b.
Pore size = 2r + 2 × 2r / √2

From the above, the hole diameter of the through-hole 34c when the bundled bars 6a and 7b are used is 34 mm, which is lower than the hole diameter 38 mm of the original design (hole diameter ratio: 0.89), and the hole diameter of the through-hole 34 can be smaller than the original design. I understand. Further, in bundled muscle 6a, the total cross-sectional area of 7b is 254 mm ^2, the original design of the reinforcing bar (straight rebar 6, fixing reinforcement 7) exceeds the cross-sectional area 199Mm ² of (sectional area ratio: 1.28), rebar It can be seen that the tensile strength is increased. The total circumference of the bundled bars 6a and 7b is 80 mm, which exceeds the circumference of the originally designed reinforcing bar (straight reinforcing bar 6 and anchoring reinforcing bar 7) 50 mm (peripheral length ratio: 1.60), and goes to the concrete of the reinforcing bar. It can be seen that the adhesion force of is increased. In other words, it can be seen that the length of the bundling can be shortened when the adhesive force is equal to that of the original design.

  By designing the through-holes 34 of the web 33 to be smaller than the reference diameter, for example, the interval between the through-holes 34 can be made narrower than before, and the degree of design freedom such as the position of the through-holes 34 provided in the web 33 of the steel frame 3 is increased. More improved. In addition, in order to ensure the tensile strength of the reinforcing bars, the sum of the cross-sectional areas of the reinforcing bars constituting the binding bars 6a and 7b should not be less than the cross-sectional area of the originally designed reinforcing bars (the linear reinforcing bars 6 and the fixed reinforcing bars 7). By designing to, the intensity | strength of the multilayer building M can be improved to be equivalent to an original design. In addition, in order to ensure the adhesion of the reinforcing bars, the sum of the peripheral lengths of the reinforcing bars constituting the binding bars 6a and 7b should not be less than the peripheral length of the originally designed reinforcing bars (straight reinforcing bars 6, fixed reinforcing bars 7). By designing, the strength of the multi-layer building M can be improved or equal to that of the original design. Moreover, since the through-hole 34 can be designed smaller than a reference diameter, the cross-sectional defect | deletion of a steel frame can be decreased compared with the case where it is set as a reference diameter. As a result, the strength of the multi-layered building M can be improved to be equivalent to the original design.

  Although the preferred embodiments of the present invention have been described above, the present invention can be implemented by combining the embodiments as much as possible.

DESCRIPTION OF SYMBOLS 1 ... Outer pillar 2 ... Large beam extended in the direction of a girder 21 ... Large beam 3 extended in the direction between beams 3 ... Steel frame 31, 32 ... Flange 33 ... Web 34 ... Through-hole 4 ...・ Main reinforcement 5 ... Star wrap 6 ... Linear reinforcement 7 ... Fixing reinforcement 71 ... Fixing area 72 ... Wrap area 8 ... Bundling wire M ... Multilayer building

Claims (5)

A joining structure of a steel-framed reinforced concrete structure in which a linear first structure and a linear second structure to which the first structure is connected are joined.
A steel frame of the second structure, wherein the steel web has a through hole through which the reinforcing bar of the first structure passes,
A reinforcing bar of the first structure,
The rebar of the first structure is located on the opposite side of the linear rebar with the end portion passing through the through hole and the straight rebar with the web as a reference, and passes through the through hole. A joining structure having a linear wrap region connected to an end of the wrap region and a fixing reinforcing bar including a deformed fixing region connected to the wrap region.   2. The joining structure according to claim 1, wherein when the tensile force is applied to the reinforcing bar of the first structure, the fixing region exerts a fixing force by a reaction force in a direction opposite to the tensile force.   The joining structure according to claim 1, wherein the fixing region has a region protruding from an outer diameter of the linear wrap region. The through-hole is at least one of the linear reinforcing bar and the fixing reinforcing bar when the reference diameter is a case where the linear reinforcing bar and the fixing reinforcing bar are designed to pass through one each. Is designed to be smaller than the reference diameter,
The joining structure according to any one of claims 1 to 3, wherein at least one of the linear reinforcing bars and the fixing reinforcing bars is passed through the through hole. A joining method of a joining structure of a steel reinforced concrete structure in which a linear first structure and a linear second structure to which the first structure is connected are joined.
The joint structure is
A steel frame of the second structure, wherein the steel web has a through hole through which the reinforcing bar of the first structure passes,
A reinforcing bar of the first structure,
The rebar of the first structure is located on the opposite side of the linear rebar with the end portion passing through the through hole and the straight rebar with the web as a reference, and passes through the through hole. A fixed reinforcing bar including a linear wrap region connected to the end of the wrap region and a deformed fixing region connected to the wrap region,
A joining method in which the fixing reinforcing bar is passed through the through-hole from the opposite side of the linear reinforcing bar, and an end of the linear reinforcing bar is connected to a linear wrap region of the fixing reinforcing bar.

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