Connecting device for concrete member and concrete structure

Abstract

To provide a connecting device for a concrete member and a concrete structure, capable of suitably suppressing breakage during ground displacement while suppressing enlargement.SOLUTION: A connecting device 10 for a concrete member is provided with a connector 11A embedded in one concrete member 20A among adjacent concrete members 20A, 20B, a connector 11B embedded in the other concrete member 20B, and a shaft part 12 connecting the connectors 11 A, 11B. The shaft part 12 is inserted into a hole part 17A formed in the connector 11A. An elastic deformation part 30 that elastically deforms in response to a tensile load in a direction where adjacent concrete members 20A, 20B separate from each other is provided in a part of the shaft part 12 projecting from the hole part 17 A to the side of the anti-connector 11B. The elastic deformation part 30 has a plurality of elastic washers 31,32 which are annularly formed of an elastic material and arranged side by side along the shaft part 12 with the shaft part 12 inserted through their inner sides.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a connecting device for concrete members and a concrete structure in which adjacent concrete members are connected by the connecting device. [Background technology]

[0002] A connecting device for connecting adjacent concrete members has been known. Patent Document 1 discloses such a connecting device that includes a first connector and a second connector that are embedded in adjacent concrete members, respectively, and a bolt that connects the connectors. In this connecting device, an insertion hole is formed in each connector, through which the shank of the bolt is inserted. The shank of the bolt is inserted into the insertion hole of each connector, and a nut is fastened to the bolt.

[0003] However, when the ground is displaced due to an earthquake, subsidence, or the like, it is expected that adjacent concrete members buried in the ground will be displaced away from each other. In that case, a tensile load will act on the connecting device that connects the concrete members, which may cause the connecting device to break.

[0004] In view of this, the connecting device of Patent Document 1 is provided with an external force absorbing member that absorbs the tensile load acting on the connecting device. The external force absorbing member is provided on the shank of the bolt, which protrudes from the insertion hole of the first connector to the side opposite the second connector. The external force absorbing member is formed in a cylindrical shape from an elastically deformable material such as rubber, and only one external force absorbing member is disposed inside with the shank of the bolt inserted therethrough. In this case, the external force absorbing member is located between the head of the bolt and the first connector.

[0005] According to the above configuration, when the ground is displaced and the adjacent concrete members are displaced in a direction away from each other, the external force absorbing member is sandwiched between the head of the bolt and the first connector and undergoes compressive deformation (elastic deformation), thereby absorbing the tensile load acting on the connecting device. Therefore, it is possible to prevent the connecting device from being damaged by the tensile load. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4687040 Summary of the Invention [Problem to be solved by the invention]

[0007] However, if a large earthquake occurs and concrete members separate from each other, it is expected that the tensile load acting on the connecting device will become large. In anticipation of such a case, it is possible to use an external force absorbing member with a large thickness (length in the axial direction). In that case, it is possible to ensure a large amount of compressive deformation that the external force absorbing member can undergo, making it possible to absorb the tensile load even when a large tensile load acts on the external force absorbing member. This makes it possible to effectively suppress damage to the connecting device.

[0008] However, if a thick external force absorbing member is used, the external force absorbing member will expand significantly toward the outer periphery when it is compressed and deformed, which will result in a substantial increase in the size of the connecting device, which is undesirable.

[0009] The present invention has been made in consideration of the above-mentioned circumstances, and has as its main object to provide a connecting device for concrete members and a concrete structure that can effectively prevent damage in the event of ground displacement while preventing the device from becoming too large. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides a connecting device for concrete members, A connecting device for connecting adjacent concrete members, comprising: A first connector integrally provided to one of the adjacent concrete members; A second connector that is integrally provided with the other concrete member; A shaft portion that connects the first connector and the second connector, The first connector has an insertion hole through which the shaft portion is inserted, The shaft portion is inserted into the insertion hole, An elastic deformation portion that elastically deforms against a tensile load in a direction in which the adjacent concrete members move away from each other is provided in a portion of the shaft portion that protrudes from the insertion hole toward the opposite second connector side, The elastic deformation portion is formed in an annular shape from an elastic material, and has a plurality of elastic annular members arranged side by side along the shaft portion with the shaft portion inserted therethrough. Effect of the Invention

[0011] The connecting device of the present invention includes a first connector and a second connector that are integrally provided on adjacent concrete members, respectively, and a shaft portion that connects the connectors. In this way, adjacent concrete members are connected to each other via the connecting device. An insertion hole is formed in the first connector, through which the shaft portion is inserted, and the shaft portion is inserted into the insertion hole. A portion of the shaft portion that protrudes from the insertion hole toward the opposite side to the second connector is provided with an elastic deformation portion that elastically deforms in response to a tensile load in a direction that causes adjacent concrete members to move away from each other. With this configuration, when ground displacement occurs due to an earthquake or the like and adjacent concrete members are displaced in a direction that causes them to move away from each other, the tensile load acting on the connecting device due to the displacement is absorbed by the elastic deformation of the elastic deformation portion.

[0012] The elastic deformation portion is made of an elastic material and has a plurality of elastic ring members arranged along the shaft portion with the shaft portion inserted inside. In this case, when a tensile load acts in a direction in which adjacent concrete members move away from each other, each of the elastic ring members elastically deforms (in other words, compressively deforms) in the same direction to absorb the tensile load. Therefore, even if a large tensile load acts on the connecting device, the tensile load can be absorbed by each of the elastic ring members, and as a result, damage to the connecting device can be effectively prevented.

[0013] In addition, in the above-mentioned configuration, since the tensile load acting on the connecting device can be dispersed and absorbed by the multiple elastic ring members, the thickness of each elastic ring member can be made smaller than when the tensile load is absorbed by a single elastic ring member. Therefore, when each elastic ring member is compressed and deformed, the amount of expansion of each elastic ring member toward the outer periphery can be suppressed. This makes it possible to suppress the size of the connecting device and to suitably suppress damage to the connecting device when ground displacement occurs. [Brief description of the drawings]

[0014] [Figure 1] FIG. 4 is a front view showing adjacent concrete members connected by the concrete member connecting device. [Diagram 2] 4 is a cross-sectional view showing adjacent concrete members connected by the concrete member connecting device; FIG. [Diagram 3] FIG. [Figure 4] FIG. 2 is a front view showing a state in which the working space of the concrete member in FIG. 1 has been filled with mortar. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a front view showing a state in which adjacent concrete members 20 are connected by a concrete member connecting device 10, and Fig. 2 is a cross-sectional view. Fig. 3 is a front view showing the concrete member connecting device 10.

[0016] As shown in Figures 1 and 2, a connecting device 10 for concrete members (hereinafter simply referred to as the connecting device 10) is used to connect adjacent concrete members 20. Each concrete member 20 constitutes, for example, a bottom spout pipe for a reservoir (corresponding to a concrete structure) and is buried inside the ground. Each concrete member 20 has opposing surfaces 20a facing each other, and a joint is formed between each of the opposing surfaces 20a.

[0017] 1 to 3, the connecting device 10 includes a pair of connectors 11 embedded in each concrete member 20, and a shaft portion 12 connecting the connectors 11. Each connector 11 has a main body portion 15 and a pair of anchor portions 16. In this embodiment, the same connectors 11 are used.

[0018] The main body 15 of each connector 11 is arranged adjacent to one another in the direction in which the concrete members 20 are arranged. The main body 15 is formed, for example, from a metal block material. However, the main body 15 may be formed by combining a pair of metal plates. Also, the main body 15 of each connector 11 is formed with a hole 17 penetrating the main body 15 in the direction in which the main bodies 15 are arranged.

[0019] The pair of anchor portions 16 are formed of reinforcing bars. In each connector 11, the pair of anchor portions 16 are fixed at their base ends to both sides of the hole 17 in the main body portion 15, and their tip ends extend to the side opposite the boundary portion of each main body portion 15.

[0020] In the following description, the reference numerals of connector 11 provided on one concrete member 20A of each concrete member 20 are given the letter A, and the reference numerals of connector 11 provided on the other concrete member 20B are given the letter B. Furthermore, the reference numerals of each part constituting connector 11A are given the letter A, and the reference numerals of each part constituting connector 11B are given the letter B. Connector 11A corresponds to the first connector, and connector 11B corresponds to the second connector.

[0021] A metal shaft 12 is inserted through the holes 17A, 17B of each connector 11A, 11B. A male thread is formed on the outer circumferential surface of each of both ends of the shaft 12. A nut 18 is fastened to a portion of the shaft 12 that protrudes from the hole 17A of the connector 11A toward the opposite connector 11B side. A nut 19 is fastened to a portion of the shaft 12 that protrudes from the hole 17B of the connector 11B toward the opposite connector 11A side. In this case, the connectors 11A, 11B (more specifically, the main bodies 15A, 15B) are connected through the shaft 12, and the adjacent concrete members 20A, 20B are connected. The hole 17A corresponds to an insertion hole.

[0022] A working space 21 used when tightening the nut 18 to the shaft portion 12 is formed in the concrete member 20A. A working space 22 used when tightening the nut 19 to the shaft portion 12 is formed in the concrete member 20B. Each working space 21, 22 is open at a side surface of the concrete member 20A, 20B. After the nuts 18, 19 are tightened to the shaft portion 12 in each working space 21, 22, mortar 25 is filled in each working space 21, 22. The mortar 25 is made of, for example, non-shrink mortar. Figures 1 and 2 show the state before the mortar 25 is filled in the working spaces 21, 22, and Figure 4 shows the state after the mortar 25 is filled.

[0023] As shown in FIG. 4, a hollow area 27 in which the mortar 25 is not filled is formed in a part of the working space 21 of the concrete member 20A. A tubular member 28 that prevents the mortar 25 from flowing into the hollow area 27 is provided around the hollow area 27. The tubular member 28 is formed in a bottomed cylindrical shape, and is made of, for example, a void tube. The tubular member 28 is arranged in a state in which the shaft portion 12 and the nut 18 are accommodated inside. When the mortar 25 is filled into the working space 21, the mortar 25 is filled with the tubular member 28 arranged as described above. As a result, the mortar 25 does not flow inside the tubular member 28, and as a result, a cylindrical hollow area 27 is formed inside the tubular member 28.

[0024] The main body 15A of the connector 11A has a pair of end faces 15a, 15b facing opposite sides in the extending direction of the hole 17A. Of the end faces 15a, 15b, the end face 15a is the face on the connector 11B side (more specifically, the main body 15B side), and the end face 15b is the face on the opposite side to the connector 11B side. The end face 15a is exposed at the opposing face 20a of the concrete member 20A, and the end face 15b faces the working space 21 of the concrete member 20A. In this case, the end face 15b faces the nut 18 in the longitudinal direction of the shaft 12 (the extending direction of the hole 17A) with a space therebetween. The nut 18 is provided to extend to the outer periphery of the shaft 12, and corresponds to the opposing part facing the main body 15 (end face 15b).

[0025] Here, when the ground is displaced due to an earthquake, subsidence, or the like, it is assumed that the adjacent concrete members 20A, 20B will be displaced in a direction away from each other. In that case, a tensile load in the direction away from each other acts on the connecting device 10. Therefore, there is a concern that the connecting device 10 will be damaged by the tensile load. In view of this, the connecting device 10 is provided with an elastic deformation section 30 that absorbs the tensile load acting on the connecting device 10. The configuration of the elastic deformation section 30 will be described below.

[0026] The elastic deformation portion 30 is provided on a portion of the shaft portion 12 that protrudes from the hole portion 17A of the connector 11A toward the opposite side to the connector 11B. In this case, the elastic deformation portion 30 is disposed between the end surface 15b of the main body portion 15A and the nut 18, and is sandwiched between the main body portion 15A and the nut 18. The elastic deformation portion 30 has a plurality of elastic washers 31, 32 and a plurality of metal washers 33. Each of the washers 31 to 33 is formed in a circular ring plate shape, and is provided with the shaft portion 12 inserted therethrough. In this case, the washers 31 to 33 are disposed in a line along the shaft portion 12.

[0027] Each of the washers 31-33 is disposed in the working space 21 of the concrete member 20A. Before the nut 18 is fastened to the shaft portion 12, each of the washers 31-33 is disposed with the shaft portion 12 inserted therethrough, and the nut 18 is fastened to the shaft portion 12 in this disposed state. After the nut 18 is fastened, the cylindrical member 28 is disposed with the washers 31-33 (and thus the elastically deformable portion 30) housed therein, and the working space 21 is filled with mortar 25 in this disposed state. As a result, the elastically deformable portion 30 is disposed in the hollow region 27 (see FIG. 4). The elastically deformable portion 30 is disposed away from the peripheral surface of the hollow region 27.

[0028] The multiple washers 31 to 33 include multiple elastic washers 31, 32 made of an elastic material and multiple metal washers 33 made of a metal material (corresponding to a hard material). The multiple elastic washers 31, 32 include multiple first elastic washers 31 and multiple second elastic washers 32. In this case, the elastic washers 31, 32 correspond to the elastic annular member, and the metal washer 33 corresponds to the hard annular member. The first elastic washer 31 corresponds to the first elastic annular member, and the second elastic washer 32 corresponds to the second elastic annular member.

[0029] The first elastic washer 31 and the second elastic washer 32 are formed of the same elastic material, for example, chloroprene rubber (CR). The hardness (Shore hardness) of the first elastic washer 31 is greater than that of the second elastic washer 32. In this embodiment, the hardness of the first elastic washer 31 is 90°, and the hardness of the second elastic washer 32 is 60°. The first elastic washer 31 and the second elastic washer 32 are both of the same size. That is, the elastic washers 31 and 32 have the same outer diameter and inner diameter, and also have the same thickness. The elastic washers 31 and 32 correspond to multiple types of elastic annular members.

[0030] The first elastic washer 31 and the second elastic washer 32 are arranged so as to overlap each other. The overlapped elastic washers 31, 32 form an elastic laminate 35. More specifically, the elastic laminate 35 is formed by overlapping one first elastic washer 31 and one second elastic washer 32. A plurality of elastic laminates 35 are arranged along the shaft portion 12, and three elastic laminates 35 are arranged in this embodiment. In each elastic laminate 35, the first elastic washer 31 is arranged on one side (the nut 18 side in this embodiment) in the longitudinal direction of the shaft portion 12, and the second elastic washer 32 is arranged on the other side (the main body portion 15A side in this embodiment). That is, in each elastic laminate 35, the arrangement of the elastic washers 31, 32 is the same.

[0031] The metal washer 33 is made of, for example, stainless steel. A plurality of metal washers 33 (four in this embodiment) are arranged alternately with the elastic laminates 35. In this case, a plurality of metal washers 33 and elastic laminates 35 are arranged alternately. In this case, for each elastic laminate 35, a metal washer 33 is arranged on both sides of the elastic laminate 35, and the metal washers 33 on both sides are overlapped on the elastic laminate 35.

[0032] The inner diameter of the metal washer 33 is the same as the inner diameter of each of the elastic washers 31 and 32. The outer diameter D1 of the metal washer 33 is larger than the outer diameter D2 of each of the elastic washers 31 and 32, in other words, larger than the outer diameter D2 of the elastic laminate 35. Specifically, the outer diameter D1 of the metal washer 33 is 1.3 times or more the outer diameter D2 of the elastic laminate 35. Among the metal washers 33, the metal washer 33a disposed closest to the main body 15A of the connector 11A and overlapped on the end surface 15b of the main body 15A has an outer diameter larger than the other metal washers 33b.

[0033] To explain the outer diameter D1 of the metal washer 33 in more detail, the elastic laminate 35 (each of the elastic washers 31, 32) is compressed (elastically deformed) in the thickness direction, as described later, and expands to the outer periphery. That is, the outer diameter of the elastic washers 31, 32 increases with the above-mentioned compressive deformation. Here, the outer diameter D2 of the elastic washers 31, 32 becomes maximum when they are compressed to the maximum in the thickness direction and cannot be further compressed. If the outer diameter D2 of the elastic washers 31, 32 in this case is the maximum outer diameter D2(max), the outer diameter D1 of the metal washer 33 is larger than the maximum outer diameter D2(max) of the elastic washers 31, 32.

[0034] Next, the function of the elastic deformation portion 30 will be described.

[0035] When ground displacement occurs due to an earthquake, land subsidence, or the like, and the adjacent concrete members 20A, 20B are displaced in a direction away from each other, the connectors 11A, 11B embedded in the concrete members 20A, 20B are displaced in a direction away from each other. In this case, a tensile load acts on the connecting device 10 in the direction away from each other.

[0036] When the connectors 11A, 11B are displaced in a direction away from each other (in other words, when a tensile load in the direction away acts on the connecting device 10), the elastic washers 31, 32 of the elastic deformation part 30 sandwiched between the main body 15A of the connector 11A and the nut 18 are elastically deformed (compressively deformed) in the direction away from each other. The tensile load acting on the connecting device 10 is absorbed by the elastic deformation of the elastic washers 31, 32. As a result, even if a large tensile load acts on the connecting device 10 due to the occurrence of a large earthquake, the tensile load can be absorbed by the elastic washers 31, 32. Therefore, the connecting device 10 can be suitably prevented from being damaged.

[0037] In addition, in the above configuration, the tensile load acting on the connecting device 10 can be dispersed and absorbed by the multiple elastic washers 31, 32, so the thickness of each of the elastic washers 31, 32 can be made smaller than when the tensile load is absorbed by a single elastic washer. Therefore, when the elastic washers 31, 32 are compressed and deformed, the amount by which each of the elastic washers 31, 32 expands toward the outer periphery can be suppressed. This makes it possible to prevent the connecting device 10 from becoming large.

[0038] As described above, the elastic washers 31 and 32 are disposed in the hollow region 27, and therefore can sufficiently expand outward when compressed and deformed. Therefore, the hollow region 27 can be said to be an expansion allowance space that allows the elastic washers 31 and 32 to expand.

[0039] According to the configuration of this embodiment described in detail above, the following excellent effects can be obtained.

[0040] When ground displacement occurs due to an earthquake or the like, it is assumed that the adjacent concrete members 20A, 20B are displaced in a direction away from each other so as to bend at their boundaries. In this case, the connectors 11A, 11B integrally provided on the concrete members 20A, 20B are displaced with the above-mentioned bending. In this respect, in this embodiment, a relatively thick elastic laminate 35 is formed by arranging a plurality of elastic washers 31, 32 in a stacked manner. In this case, when the connectors 11A, 11B are displaced with the bending of the concrete members 20A, 20B, the elastic laminate 35 (the elastic washers 31, 32) is easily compressed and deformed to follow the displacement, and as a result, the tensile load can be suitably absorbed.

[0041] Metal washers 33 are disposed on both sides of the elastic laminate 35, and each metal washer 33 is placed on the elastic laminate 35. In this case, the elastic laminate 35 is compressed and deformed (elastically deformed) while being sandwiched between the metal washers 33. In addition, since the outer diameter D1 of each metal washer 33 is larger than the outer diameter D2 of the elastic laminate 35, in this case, it is possible to compress and deform the entire elastic laminate 35. This allows the elastic laminate 35 to exhibit an optimal load absorbing effect.

[0042] A plurality of metal washers 33 and elastic laminates 35 are arranged alternately. In this case, the number of elastic laminates 35 can be appropriately adjusted according to the magnitude of the tensile load expected to act on the connecting device 10. In addition, it is possible to obtain the above-mentioned effect that the load absorbing effect of the elastic laminates 35 is suitably exhibited in each of the elastic laminates 35.

[0043] The elastic deformation part 30 has a first elastic washer 31 and a second elastic washer 32 having different hardnesses. In this case, the elastic washers 31, 32 have different hardnesses, and therefore, are different in their ease of elastic deformation. According to this configuration, when the tensile load acting on the connecting device 10 is small, the second elastic washer 32, which is easily elastically deformed, is compressed and deformed to absorb the tensile load. When the tensile load acting on the connecting device 10 is large, the first elastic washer 31, which is less easily elastically deformed, is compressed and deformed to absorb the tensile load. This allows the connecting device 10 to absorb the tensile load suitably, regardless of the magnitude of the tensile load acting on the connecting device 10.

[0044] The present invention is not limited to the above embodiment, and may be implemented, for example, as follows.

[0045] (1) In the above embodiment, the hardness of the first elastic washer 31 and the second elastic washer 32 forming the elastic laminate 35 are different from each other, but this may be changed to make the materials of the elastic washers 31, 32 different. In this case, too, by making the materials of the elastic washers 31, 32 different, it is possible to make the ease of elastic deformation of the elastic washers 31, 32 different. Therefore, it is possible to suitably absorb the tensile load regardless of the magnitude of the tensile load acting on the connecting device 10.

[0046] For example, it is possible to form the first elastic washer 31 from chloroprene rubber (CR) and the second elastic washer 32 from urethane rubber. Urethane rubber is a material with high compression recovery. Here, when the concrete members 20A, 20B move away from each other due to displacement of the ground and the elastic washers 31, 32 are compressed and deformed, the concrete members 20A, 20B will then approach each other again and return to their original positional relationship. At this time, the second elastic washer 32 formed from urethane rubber can be quickly restored to its original state before compression.

[0047] The elastic washers 31 and 32 may be made of the same material and have the same hardness.

[0048] (2) In the above embodiment, the elastic laminate 35 is formed by stacking the two elastic washers 31, 32, but the elastic laminate may be formed by stacking three or more elastic washers.

[0049] (3) In the above embodiment, three elastic laminates 35 are provided, but only one, two, or four or more elastic laminates 35 may be provided. In short, the number of elastic laminates 35 may be appropriately set according to the magnitude of the tensile load acting on the connecting device 10.

[0050] (4) In the above embodiment, the elastic laminate 35 (two elastic washers 31, 32) and the metal washer 33 are arranged alternately, but this may be modified so that multiple elastic washers and metal washers are arranged alternately.

[0051] (5) In the above embodiment, a bolt may be used instead of the shaft portion 12. The bolt has a shaft portion and a head portion provided at one end of the shaft portion. In this case, the head portion of the bolt (corresponding to the opposing portion) is provided instead of the nut 18 as the opposing portion. The elastic deformation portion 30 is sandwiched and disposed between the head portion of the bolt and the main body portion 15A of the connector 11A.

[0052] (6) In the configuration using the bolt described in (5) above, of the connectors 11A and 11B, the connector 11B (corresponding to the second connector) on the concrete member 20B side may be changed to a joint member (corresponding to the second connector) having a screw hole into which the shank of the bolt can be screwed. In this case, the shank of the bolt is screwed into the screw hole of the joint member.

[0053] (7) In the above embodiment, the elastic deformation portion 30 is provided on the connector 11A side of each connector 11A, 11B, but in addition to this, the elastic deformation portion 30 may be provided on the connector 11B side. In this case, the elastic deformation portion 30 is provided on a portion of the shaft portion 12 that protrudes from the hole portion 17B of the connector 11B to the side opposite the connector 11A.

[0054] (8) In the above embodiment, the connecting device of the present invention is embodied as a connecting device 10 that connects the concrete members 20 that constitute a bottom spout pipe, but the connecting device of the present invention does not necessarily have to be applied to concrete members for a bottom spout pipe, and can also be applied when connecting concrete members used for other purposes. [Explanation of symbols]

[0055] 10...connecting device for concrete members, 11A...connecting device as first connecting device, 11B...connecting device as second connecting device, 12...shaft portion, 17A...hole portion as insertion hole, 30...elastic deformation portion, 31...elastic washer as elastic annular member, 32...elastic washer as elastic annular member, 33...metal washer as hard annular member, 35...elastic laminate.

Claims

1. A connecting device for connecting adjacent concrete members, comprising: A first connector that is integrally provided with one of the adjacent concrete members; A second connector that is integrally provided to the other concrete member; A shaft portion that connects the first connector and the second connector, The first connector has an insertion hole through which the shaft portion is inserted, The shaft portion is inserted into the insertion hole, An elastic deformation portion is provided in a portion of the shaft portion that protrudes from the insertion hole toward the opposite second connector side, and elastically deforms in response to a tensile load in a direction in which the adjacent concrete members move away from each other, A concrete member connecting device, wherein the elastic deformation portion is formed in a ring shape from an elastic material and has a plurality of elastic ring members arranged in line along the shaft portion with the shaft portion inserted inside.

2. 2. The connecting device for concrete members according to claim 1, wherein the elastic deformation portion has, as the elastic annular member, a plurality of elastic annular members arranged in a stacked manner to form an elastic laminate.

3. the elastic deformation portion has a hard annular member formed of a hard material and having the shaft portion inserted therethrough, The rigid annular members are disposed on both sides of the elastic laminate in a state where they are overlapped with the elastic laminate, 3. The concrete member connecting device according to claim 2, wherein the outer diameter of each of said rigid annular members is greater than the outer diameter of said elastic laminate.

4. 4. The connecting device for concrete members according to claim 3, wherein a plurality of said rigid annular members and said elastic laminates are arranged alternately in a row.

5. 5. The connecting device for concrete members according to claim 1, wherein the elastic deformation portion has a plurality of types of elastic annular members each having a different ease of elastic deformation as the elastic annular member.

6. 6. The connecting device for concrete members according to claim 5, wherein the plurality of types of elastic annular members are made of different materials or have different hardnesses.

7. A connecting device for concrete members according to claim 1; The adjacent concrete members connected by the connecting device; A concrete structure comprising:

Images