JP5638018B2 - Concrete connecting member and connecting device for concrete member - Google Patents

Description

  The present invention relates to a connection member integrally provided at an end portion of a concrete member for connection of the concrete member and the like, and a connection device for the concrete member.

  For example, a connecting member is required for the concrete member in order to connect, draw or joint the concrete members. Conventionally, as a structure for connection or joining in the above work, an anchor member mainly composed of a rod-like member and embedded in a concrete member and serving as an anchor, and a plate-like member on which the anchor member is integrally attached A connecting member consisting of was used. The connecting member is attached to the concrete member by, for example, insert molding, and the insertion opening opened in the plate member is used as a loose hole so that the displacement of the position of the connecting portion between the concrete members can be absorbed when the connecting bolt is passed. It is configured.

  However, in the case of the conventional connecting member a, a loose hole c is provided on the plate surface of the plate member b to which the most force is applied during connection (see FIG. 10), and there is a problem that the rigidity of the plate member is lowered. is there. Since it is the loose hole c, it must be large to some extent, but the size of the loose hole c affects the performance as a connecting member. In other words, when the plate member b is deformed due to a decrease in rigidity, there arises a problem that the connection, pulling (see FIG. 11) between the concrete members f and f (see FIG. 11), jointing, or the like is performed only incompletely. On the other hand, if the loose hole c is small, the displacement between the concrete members cannot be absorbed, and there is a problem that the concrete members cannot be connected. The anchor member d is welded to both sides of the plate member b.

  Regarding the deformation of the plate member due to the decrease in rigidity, in Japanese Patent Application Laid-Open No. 2002-227312, a portion corresponding to the plate member in the connection member is cast, and the portion is made thick to ensure rigidity and cope with the deformation. The invention is disclosed. However, in casting, it is necessary to modify the mold in order to change its shape, which increases costs. Further, in order to connect the first anchor reinforcing bar and the second anchor reinforcing bar to the connecting member that is the plate portion, male threading is performed on the first anchor reinforcing bar and the second anchor reinforcing bar, and the connecting parts of the connecting member are respectively connected. The internal thread must be machined, which increases the machining cost. In addition, it is conceivable to weld the above-mentioned portion corresponding to the plate portion to the first anchor reinforcing bar and the second anchor reinforcing bar, but since the above-mentioned portion corresponding to the plate portion is a so-called cast product as described above, welding is performed. It is difficult and not realistic. Moreover, in order to weld a 1st anchor reinforcing bar and a 2nd anchor reinforcing bar, when the said part corresponded to a plate part is manufactured other than a cast product, for example, it is a forged product, the manufacturing cost will further increase.

JP 2002-227312

  The present invention has been made paying attention to the above points, and the problem is that the work such as connection, pulling, or jointing between concrete members is substantially performed while maintaining rigidity higher than that of the conventional connection member. To be able to do it completely. Moreover, the other subject of this invention is absorbing the shift | offset | difference of concrete members. Another object of the present invention is to enable the connection member to be manufactured at a lower cost than a cast product, a forged product or the like.

In order to solve the above problems, the present invention provides a connecting member provided at an end of a concrete member for connecting the concrete member. The connecting member has an anchor portion and a yoke portion, and the yoke portion is required. formed Rutotomoni from the plate portion of the width, is matched with the longitudinal direction in the width direction and the anchor portion of the plate portion, the plate portion width direction and the connecting bolt by bending to so as to surround the cavity by the plate portion An insertion slot having a matching insertion direction is formed, and the insertion slot is provided with a means for making a loose hole for a connection bolt used for connecting a concrete member.

  In the connecting member of the present invention, the yoke portion is composed of a plate portion having a required width, and the insertion portion is formed by bending the plate portion so as to surround the void. It does not have rigidity. In other words, by making the width of the plate portion larger than the size of the end of the insertion port formed by the plate portion, the section coefficient of the plate portion is made larger than the conventional one, This means that the rigidity is higher than that of the conventional one. That is, in the conventional connecting member, the anchor member d is connected to the connecting surface of the plate member b in a direction perpendicular to the connecting surface. However, in order to ensure rigidity when a load is applied in the x direction on the plate. There is only to increase the thickness of the plate, and when the loose hole is large, the rigidity of the plate portion is unavoidable, and the size of the loose hole is limited (see FIG. 10B), When the connection device according to the present invention is manufactured, higher rigidity is ensured even if the same material as the conventional one is used.

  In addition, the connection member of the present invention is assumed to be composed of a plurality of anchor portions for exerting a resistance force against an external force, and a yoke portion for attaching them, corrosion resistance, structural strength, It is preferable from the aspect of economical efficiency and commercialization of an ideal shape. Generally speaking, the yoke part is integrated with the anchor part and the side part, and it is only necessary to have a connection bolt insertion hole between the anchor parts. It is desirable to have a shape that allows the position adjustment by loosely inserting the connecting bolt.

  Further, the yoke portion is composed of a plate portion having a required width, and an insertion port is formed by bending the plate portion so as to surround the void, and the insertion port constitutes a kind of cylindrical shape. . Thus, since the plate portion can be formed by bending, it can be manufactured at a very low cost. Therefore, a connection member having sufficient strength can be manufactured without using a casting mold or a forging mold.

  Moreover, about the magnitude | size of the insertion opening of the yoke part which has the insertion opening which is a loose hole, when a connection member is applied to a connection apparatus, the magnitude | size of the said insertion opening is 200-300 of a connection bolt diameter, for example. % Can be estimated. However, even if the size of the insertion port is made larger than that of the conventional one, there is almost no decrease in the strength of the connecting member of the present invention. The strength of the connecting member of the present invention depends on the section modulus of the yoke portion, and the section modulus is determined by the size of the end portion of the insertion port formed by the plate portion and the width size of the plate portion. There is little possibility of being influenced.

  In addition, since the size of the connecting member according to the present invention, that is, the shape of the plate portion in plan view is smaller than the shape of the conventional plate member in plan view and is compact, the structure provided in the concrete member The connecting member can be disposed between the reinforcing bars. In the conventional connecting member, a part of the structural reinforcing bar has to be cut out and arranged, and there is a concern that the strength of the portion in the concrete member is reduced. However, the connecting member according to the present invention does not have such a problem. In addition, when the connecting member is arranged on the concrete member, a part of the connecting member is exposed on the surface of the concrete member, but the exposed surface area is smaller than that of the conventional one, and therefore, it is difficult to rust. . Since the concrete connecting device using this connecting member may be left for a long time after being manufactured, and is easily rusted by the environment in which it is left, the present invention can reduce the concern.

  The present invention also relates to a concrete member connecting device having a connecting member integrally provided at an end of a concrete member for connection of the concrete member, the connecting member has an anchor portion and a yoke portion, The yoke portion is composed of a plate portion having a required width, and an insertion port is formed by bending the plate portion so as to surround a void. The insertion port is a loose hole for a connection bolt used for connecting a concrete member. And a connecting bolt configured to match the width direction of the plate portion and the longitudinal direction of the anchor portion, combined with the connecting member and connected to the concrete member by tightening, and the concrete member Operate the connection bolt from the work port opened on the side of the end to perform connection work with the screwed counterpart that has a nut. May be configured as a connecting device for the concrete member was so that.

  The connecting device for a concrete member according to the present invention includes a connecting member integrated with the concrete member and a connecting bolt, and the connecting bolt is operated from a work port opened on a side surface near the end of the concrete member. However, the screwing partner of the connection bolt is a female screw portion or the like provided on the mating concrete member to be connected to the concrete member. Or the internal thread part provided in the lifting machine side can also become object. As the female thread portion, a known insert nut (see FIG. 7) or a connecting member main body constituting the apparatus of the present invention is provided on the mating concrete member, and the nut is arranged on the connection bolt insertion port from the work port (FIG. 8). For example).

  A work port is provided on the side surface of the concrete member to operate a connection bolt or the like between the anchor portions. The work port communicates with a connection bolt insertion port. The work port is located between the structural reinforcing bars and can be formed simultaneously with the molding of the concrete member. The working port is molded by a molding die in which a connecting member main body having an anchor portion and a yoke portion is incorporated in a molding apparatus. Further, in order to maintain the state in which the connection bolt is engaged with the opening into which the connection bolt is inserted, an engaging member such as a washer that compensates for the difference between the diameter of the insertion hole and the diameter of the connection bolt head is used.

  The connecting member can also be constituted by two plate portions obtained by press-molding a steel plate and punched into a substantially gate shape (see FIG. 6). That is, the two plate parts are composed of a yoke-integrated plate part in which the left and right anchor parts and the yoke part are integrated, and members having exactly the same shape and structure can be used for the two plate parts. Therefore, since it is only necessary to weld two end portions by combining two kinds of members, it can be manufactured at the lowest cost. In the apparatus of the present invention, in this case as well, a washer having an appropriate size is used in order to compensate for a difference in diameter from each insertion port.

  In the connection device of the present invention, it is likely that it will be formed at the same time as the molding of the co-crete member from the description so far, but this is not always the case, and it can be applied as a retrofit to existing concrete products. Applicable. In the case of so-called retrofitting to an existing concrete product, a hole with an appropriate diameter is made in the end of the existing concrete and the anchor part is inserted and fixed using a known method, so it is integrated with the front end part of the anchor part. The yoke that is present is exposed at the end of the concrete member. It is also possible to cut a female thread at the insertion port of the connecting bolt, thereby also serving as a hanging insert.

  Since the present invention is constructed and operates as described above, it has significantly higher rigidity than a conventional connecting member made up of a plate member and an anchor member, and the connecting member is made up of a yoke portion and an anchor portion. By configuring, it is possible to eliminate a decrease in rigidity at the connecting portion, and it is possible to almost completely perform operations such as connection, pulling, or jointing between concrete members. In addition, the yoke portion can be formed compactly, and since it fits between the structural reinforcing bars, there is no need to cut the reinforcing bars, and there is an effect that the strength of the concrete member is not impaired. Furthermore, it can be manufactured at a lower cost than a conventional connecting member manufactured by casting, and also exhibits the characteristics of being resistant to rust.

  Hereinafter, the present invention will be described in more detail with reference to illustrated embodiments. FIG. 1 shows a connecting member 20 used in a concrete connecting device for drawing a concrete member according to the present invention. 7 and the like show a state in which the connecting member 20 is applied to the concrete connecting device. In FIG. 7, reference numerals 11 and 12 denote concrete members, 13 and 14 denote end surfaces on the respective connection sides, and Reference numeral 15 denotes a connection bolt.

  The connecting member 20 according to the first embodiment shown in FIG. 1 includes two anchor portions 21 and 22 and a yoke portion 25, and the yoke portion 25 is integrated with the anchor portions 21 and 22 by welding portions 23 and 24. ing. The yoke portion 25 is formed of a steel strip material. Specifically, the belt material is pressed to form the convex portion 28a, and the concave portion inside the convex portion 28a is used as the insertion port 28. Anchor portions 21 and 22 are disposed at both ends of the yoke portion 25. The anchor portions 21 and 22 are made of a structural material having a necessary and sufficient length as an anchor. For example, a member known as a deformed reinforcing bar can be used. In this case, the concavo-convex structure on the surface of the reinforcing bar is used for engagement. It functions as the uneven portion 29.

  The insertion port 28 is configured so as to surround the void space by the plate portions 26 and 27 constituting the yoke portion 25. By integrating in the width direction of the strip material constituting the plate portions 26 and 27 in this way, the section modulus of the connecting member 20 is remarkably improved as compared with the conventional connecting member a, and the vertical direction in the x direction in the figure. Can sufficiently withstand the load. That is, in the conventional connecting member a, the section modulus calculated by the width t ′ and the plate thickness w ′ is significantly lower than that of the connecting member 20 according to the present invention, and the limit to withstand the load in the x direction is very low. Become. In addition, when the loose hole c is enlarged in the conventional connecting member a, the void portion becomes larger, and hence the rigidity in the x direction in the figure cannot be maintained. On the other hand, in the case of the present invention, a vertical load in the x direction in the figure is received in the width direction of the strip member of the yoke portion 25, so that extremely high strength is exhibited.

  The insertion port 28 is substantially oval, but is inclined with respect to the longitudinal axis of the yoke portion 25. By using such an arrangement, when the connection member 20 is used face to face, the displacement of the positions of the concrete members is absorbed, and the position of the connection bolt 15 is within a range where the oval insertion port 28 overlaps. Can be matched. The oval insertion port 28 can be freely changed in size, and even when set to a larger size, there is an advantage that the strength does not decrease as compared with the conventional connection member a.

  FIG. 2 shows a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the second embodiment, the yoke portion 35 of the connecting member 30 is constituted by the plate portion 36, but a ring-shaped band plate material is used as the plate portion 36. That is, in order to form a loose hole, both ends of the plate portion 36 constituting the yoke portion 35 are crushed and processed to form the insertion port 38 having the convex portion 38a. In the first embodiment, the two plate portions 26 and 27 are formed by bonding, but according to the connection member 30 of the second embodiment, both ends of the ring-shaped plate portion 36 can be crushed and processed, There is no need to prepare two members. For example, a member obtained by cutting a cylindrical member having a required diameter can be used. Therefore, as in the first embodiment, it is possible to reduce the processing cost. It is to be noted that the section modulus of the connecting member 30 is improved as compared with the conventional connecting member a, and it can withstand the load in the x direction in the figure as in the first embodiment.

  FIG. 3 shows a third embodiment of the present invention. Accordingly, the same components as those of the first embodiment are indicated by the same reference numerals, and detailed description thereof is omitted. The yoke portion 45 in the connection member 40 of the third embodiment is also composed of plate portions 46 and 47 as in the first embodiment. However, in the case of the third embodiment, the first embodiment has an inclined or asymmetric shape. Unlike the insertion hole 28 which is the loose hole of the example, the shape of the insertion hole 48 is not inclined, and a convex part 48a having a symmetrical shape is formed and is O-shaped. In addition, it is the same as that of the first embodiment that the section modulus of the connecting member 40 is improved as compared with the conventional connecting member a and can withstand the load in the x direction in the figure. In the case of the third embodiment, it is necessary to set the shape of the insertion port 48, which is a loose hole, to be relatively large.

  FIG. 4 shows a fourth embodiment of the present invention. The same components as those of the first embodiment are shown with the same reference numerals, and detailed description thereof is omitted. In the fourth embodiment, the anchor portions 51 and 52 in the connection member 50 are configured by high nut members 51a and 52a and anchor members 51b and 52b screwed to the high nut members 51a and 52a, respectively. The plate portions 56 and 57 are attached to the plate portions 56 and 57 with welded portions 53 and 54 on both sides thereof. The fourth embodiment is effective when the concrete reinforcing bars are arranged vertically and horizontally in the concrete product, and therefore the anchor portion cannot be arranged in the gap between the structural reinforcing bars. As in the third embodiment, the yoke portion 55 is composed of plate portions 56 and 57, and an insertion port 58 formed of a convex portion 58a having a symmetrical shape without being inclined between them. Have. Similarly to the third embodiment, the section modulus of the connecting member 50 is improved and the load in the x direction in the figure can be withstood. Further, the configuration of the anchor portion 47 is the same as in the previous embodiments.

  The fifth embodiment shown in FIG. 5 is similar to the example of the second embodiment in that the connection member 60 is processed by crushing the ring-shaped plate portion 66, but the insertion port 68 having an oval shape is provided. It differs in the point formed. That is, the yoke portion 65 in the connection member 60 is also composed of a plate portion 66 made of a ring-shaped strip, and according to the connection member 60 of the fifth embodiment, the ring-shaped plate portion 66 is processed into an oval shape. Therefore, there is an advantage similar to that of the second embodiment, for example, that it is not necessary to prepare two members. Moreover, since the whole is formed in the ellipse, the whole outer part becomes the convex part 68a. The anchor portions 21 ′ and 22 ′ in the fifth embodiment are made of so-called round bars, and the end portions are bent to form the engaging uneven portions 29 ′. It is to be noted that the section modulus of the connecting member 60 is improved as compared with the conventional connecting member a, and it can withstand the load in the x direction in the figure as in the first embodiment.

  The connection member 70 in the sixth embodiment shown in FIG. 6 is composed of two plate portions 76 and 77 formed by press-forming a steel plate and punching it into a substantially gate shape. That is, the two plate portions 76 and 77 are composed of yoke-integrated plate portions 76 and 77 in which the left and right anchor portions 71 and 72 and the yoke portion 75 are integrated. Since these two plate portions 76 and 77 are in the same form, two identical members are used, and are integrally formed by the welded portions 73 and 74 at both ends of the yoke portion 75, and have a convex portion 78a. 78 can be formed. In the case of this example, when the two plate portions 76 and 77 are processed, serrated portions are formed on the side surfaces of the anchor portions 71 and 72, and the engaging uneven portions 79 are formed. In 6th Embodiment, since the connection member 70 can be obtained by using two 1 type members and welding them, the surface of cost is suppressed most cheaply. It is to be noted that the section modulus of the connecting member 70 is improved as compared with the conventional connecting member a, and it can withstand the load in the x direction in the figure as in the first embodiment.

  Each of the connecting members 20, 30, 40, 50, 60, 70 according to the above embodiments of the present invention has a structure integrated with the concrete members 11, 12, thereby constituting a connecting device for the concrete member. To be. As an example, a concrete member connection device 10 using the connection member 20 according to the first embodiment will be described. In Example 1 shown in FIG. 7, the connection member 20 is insert-molded into the one concrete member 11 and integrally provided near the end surface 13 of the one concrete member 11. Moreover, the connection bolt 15 is inserted so that it may screw with the receptacle 16b provided in the other concrete member 12 to the insert nut 16 which has the internal thread part 16a. Reference numeral 15a denotes a connection bolt head, and 15b denotes a connection bolt male thread portion. Reference numeral 17 denotes a work opening, which is opened on the side surface of the end portion of the concrete member 11 and provides a work space when the connection member 20 is attached or bolted.

  FIG. 8 shows Example 2 of the embodiment of the concrete member connecting device according to the present invention, and the configuration of one concrete member 11 of the pair of concrete members 11 and 12 is substantially the same as that of the first embodiment. However, in the case of Example 2, the other concrete member 12 uses a bolt 15 'as a connecting member instead of an insert nut. The bolt 15 ′ is a double screw bolt, and is symmetrical to the end face 13 of one concrete member 11 and the end face of the other concrete member 12 in contrast to the connection bolt 15 integrally provided by insert molding. It is provided at a close position.

  In the case of Example 2 of the above-described embodiment, both yoke portions 25 and 25 'have the insertion holes 28 and 28' which are loose holes shown in FIG. 1, and the connecting member 20 is connected by the connecting bolt 15 passing therethrough. , 20 '. Since the connecting bolt 15 has male threaded portions at both ends, the nuts 18 and 18 'are screwed to the respective ends and fastened. Reference numerals 19 and 19 ′ denote washers (see FIGS. 1 and 3).

  As is clear from the case of Example 2 of the embodiment, the connection bolt 15 inserted through the connection members 20 and 20 ′ is tightened by the nuts 18 and 18 ′, but the insertion ports 28 and 28 ′ are loose holes. It is easy to absorb the position shift between heavy concrete members. Further, the above-described washers 19 and 19 'are used to compensate for the difference in diameter between the connection bolt 15 and the insertion holes 28 and 28'.

  In the case of the present invention, the connection members 20, 30, 70 in the first embodiment or the like have a shape in which the insertion openings 28, 38, 78 that are loose holes are inclined, and the connection members in the example of the second embodiment, etc. In 40, 50, and 60, the insertion holes 48, 58, and 68 which are loose holes have a substantially oval shape. Therefore, the connecting bolts 15 and 15 ′ can be inserted into the overlapping range of the insertion ports 28, 38 and 78, or the overlapping range of the insertion ports 48, 58 and 68, and the positional deviation between the concrete members 11 and 12 can be achieved. Can be absorbed.

Considering the strength of the connecting member 20 in the first embodiment of the present invention, the sectional modulus of the single yoke portion 25 is: square of x dimension (t) × x dimension (w). X It is calculated by a constant = t · w ² · 1/6. On the other hand, the section coefficient of the yoke part b in the conventional connecting device is: square of x-direction (t ′) × square of x-direction (w ′) × constant = t ′ · w ′ ² · 1/6 , Calculated by When the two are compared, the connecting member 20 of the present invention has an overwhelmingly large value, and the difference increases as the size of the loose hole, which is the insertion opening, is increased. It can be seen that the rigidity of the connecting device of the present invention is significantly higher than that of the conventional connecting device.

  FIG. 11 shows a conventional connecting member a formed integrally with a concrete member f. Since the concrete member f to which the connecting member a is applied can only bear an external force in the thickness direction of the connecting member a, the rigidity in the y-direction in the drawing is an external force in the width direction of the connecting member 20. It can be seen that it is significantly lower than the rigidity of the concrete connecting device 10. In addition, in the concrete member, structural reinforcing bars 81 and 82 are arranged vertically and horizontally in order to ensure a certain strength (FIG. 12). This is preliminarily placed inside the formwork and poured into the concrete to be integrated with the concrete member. However, in the conventional concrete connecting device a, a part of the reinforcing bars 83 must be cut before the connecting member a is arranged. There was a problem that I could not. That is, the conventional connection member a has, for example, a yoke portion b having a shape in a plan view in order to ensure a certain strength in a state where the insertion port c which is a loose hole is formed. In some cases, it could not be arranged without removing the reinforcing bars (see FIG. 12).

  In contrast, the connection members 20 to 60 used in the connection device 10 according to the present invention can ensure significantly higher rigidity in a certain direction than the conventional one, and at the same time, the shape of the yoke portions 25 to 75 in plan view. Can be made compact. For this reason, in the connection members 20-70 of this invention, when shape | molding a concrete member, it can arrange | position between the reinforcing bars 91 and 92. FIG. Therefore, there is no need to take measures such as cutting a part of the reinforcing bar of the concrete member, and there is no possibility that the strength of the connecting members 20 to 70 will decrease.

  Generally, a concrete member is often formed in a wild state until it is molded at a work site and actually used. Therefore, it is understood that the connecting member according to the present invention has a smaller area exposed to the outside than a conventional connecting member, and a smaller portion that comes into contact with the atmosphere, and therefore is less susceptible to rusting than the conventional one. Wax (see Figure 9 etc.). Therefore, it is not necessary to use a material that hardly rusts, such as a stainless steel material, as the material of the connection member. However, this does not mean that the stainless steel material is excluded from the connection member according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiment 1 of the concrete connection member which concerns on this invention is shown, A is a top view and B is a front view. Similarly, Embodiment 2 is shown, in which A is a plan view and B is a front view. Similarly, Embodiment 3 is shown, in which A is a plan view and B is a front view. Similarly, Embodiment 4 is shown, in which A is a plan view and B is a front view. Similarly, Embodiment 5 is shown, in which A is a plan view and B is a front view. Similarly, Embodiment 6 is shown, in which A is a plan view and B is a front view. It is a top view which shows Example 1 of embodiment of the connection apparatus for the concrete members based on this invention. The example 2 of embodiment of the connection apparatus for the concrete members based on this invention is shown, A is a side view, B is a top view. The connection state of the connection apparatuses for the concrete member which concerns on this invention is shown, A is a top view, B is a side view, C is an end view. The conventional concrete connection member is shown, A is a top view and B is a front view. The connection apparatus for the conventional concrete member is shown, A is a side view and B is a top view. The example which applied the connection device for the conventional concrete member to the concrete member is shown, A is a top view and B is an end view.

DESCRIPTION OF SYMBOLS 10 Concrete member connection apparatus 11, 12 Concrete member 13, 14 End surface 15, 15 'Connection bolt 16 Insert nut 17, 17' Work port 20, 30, 40, 50, 60, 70 Connection member 21, 22, 71, 72 Anchor Parts 23, 24, 73, 74 welded parts 25, 35, 45, 55, 65, 75 yoke parts 26, 27, 36, 47, 48, 56, 57, 66, 76, 77 plate parts 28, 38, 48, 58, 68, 78 Inlet 29, 29 ', 79 Concavity and convexity for engagement

Claims (5)

For connection of the concrete member, a connecting member provided at the end of the concrete member, said connecting member has a anchor portion and the yoke portion, the yoke portion is formed Rutotomoni from the plate portion of the required width, the By aligning the width direction of the plate portion with the longitudinal direction of the anchor portion and bending the plate portion so as to surround the void, an insertion port is formed in which the width direction of the plate portion matches the insertion direction of the connecting bolt. the spigot is concrete connecting member, characterized in that there is a loose hole for the connection bolt used for connection of the concrete member. The plate part has a front plate and a rear plate, bends them so as to surround the void, joins both sides of them, and uses the part enclosed by the front plate and the rear plate as an insertion port. The connection member according to claim 1, characterized in that: The connection member according to claim 1, wherein the connection member is composed of two plate portions formed by press-molding a steel plate and punched into a substantially gate shape. A concrete member connection device having a connection member integrally provided at an end of a concrete member for connection of the concrete member, wherein the connection member has an anchor portion and a yoke portion, and the yoke portion is required formed Rutotomoni from the plate portion of the width, is matched with the longitudinal direction in the width direction and the anchor portion of the plate portion, the plate portion width direction and the connecting bolt by bending to so as to surround the cavity by the plate portion forming a receptacle for insertion direction coincides, the receptacle is a loose hole for the connection bolt used for connection of the concrete member, also combined with the connecting member, connection of the concrete member by tightening The connection bolts to be operated and the above-mentioned connection bolts from the work openings opened on the side surfaces of the concrete members. Connection device for concrete members so as to perform the work of connecting the threaded mating with. 5. The concrete member according to claim 1, wherein a dimension in a width direction of a plate part constituting the yoke part is made larger than a material thickness dimension of a constituent material of the plate part. Connecting device for.

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