JP6337230B2 - Seismic joint structure - Google Patents

Description

  The present invention connects concrete structures such as a concrete unit wall member, box culvert, bridge concrete girder and concrete floor slab constituting a seawall and attenuates vibrations caused by earthquakes and the like to the concrete structure. The present invention relates to earthquake-resistant joint structures.

  Conventionally, in a joint structure for connecting concrete structures to each other, a rod-shaped connecting member having vibration damping means is disposed between a pair of adjacent concrete structures, and the connecting members connect the concrete structures to each other and shear strength. An earthquake-resistant joint structure is known in which vibration is attenuated by the above-described vibration attenuating means while enhancing the vibration.

  For example, Patent Document 1 below discloses an earthquake-resistant joint structure that connects while attenuating vibration generated in a pair of adjacent bridge girders (including a concrete girder).

  The earthquake-resistant joint structure of Patent Document 1 below is a vibration provided with a retaining portion and a coil spring (elastically deforming portion) disposed inside the retaining portion at one end of a rod-shaped coupling member that couples a pair of adjacent bridge beams. While the damping device is disposed, a coil spring is not provided at the other end portion of the connecting member, and the other end portion is configured to be in a free state while preventing the other end portion from coming off.

  Further, the following Non-Patent Document 1 discloses that in a continuous and long concrete structure, a discontinuous portion called a structural joint is formed in order to shorten the span in the longitudinal direction, and the discontinuous portion is interposed through the discontinuous portion. An earthquake-resistant joint structure is disclosed in which a rod-shaped connecting member called a slip bar is disposed between a pair of adjacent concrete structures.

  In the earthquake-resistant joint structure of Non-Patent Document 1 below, one end of a connecting member is slidably disposed in an insertion hole drilled in one adjacent concrete structure, and further in a cap disposed at the tip of the insertion hole. A cushioning material (elastically deforming portion) is provided, and the cushioning material is in contact with the end face of one end of the connecting member to form vibration damping means. The other end of the connecting member is embedded and fixed in the other concrete structure.

Japanese Patent No. 3300284

Yoshifumi Hattori, Takamasa Fukuda, Takashi Oda, “Practical Series 2 Understanding Design and Design 2 Design of Reinforced Concrete Structures”, First Edition, Sankai-do Co., Ltd., July 19, 2007, p.201-202,204-205

  The earthquake-resistant joint structure of Patent Document 1 has a configuration in which vibration damping means is disposed only at one end of the connecting member, and the vibration damping device can handle only vibration in a direction in which the coil spring retracts. That is, it is an earthquake-resistant joint structure that can attenuate vibration only when a pair of adjacent concrete structures vibrate in a direction away from each other.

  Further, the earthquake-resistant joint structure of Non-Patent Document 1 also provides vibration damping means only at one end of the connecting member. In addition, the other end of the connecting member is fixed, and the vibration damping means has a structure that can handle only the vibration in the direction in which the cushion retracts. That is, it is an earthquake-resistant joint structure that can attenuate the vibration only when a pair of adjacent concrete structures vibrate in the approaching direction.

  Therefore, each of the conventional seismic joint structures described above has a problem that the vibration can be appropriately damped only in one of a case where a pair of concrete structures adjacent to each other vibrate in an approaching direction and a case where they vibrate in a separating direction. Has a point.

  Further, only the coil spring and the cushion material which are elastic deformation portions are configured to contribute to vibration damping, and there is a problem that they are easily deteriorated when a repeated force is applied to these elastic deformation portions.

  According to the present invention, the elastically deformable portion is made of rubber, and the cover portion for protecting the elastically deformable portion is also made of rubber, and the periphery of the cover portion is restrained. Provide a seismic joint structure that can effectively dampen vibration.

  In short, the earthquake-resistant joint structure according to the present invention includes a rod-shaped connecting member that connects a pair of adjacent concrete structures, and vibration damping means is provided on at least one end of the connecting member, and the vibration damping means. In the seismic joint structure embedded in the concrete structure, the vibration damping means includes a retaining portion that moves together with an end portion of the connecting member, and a first elastic deformation made of rubber disposed inside the retaining portion. And a rubber second elastic deformation portion arranged on the outer side, and a rubber cover portion covering the retaining portion and the first and second elastic deformation portions, the cover portion being One elastic deformation portion is covered through a first space allowing deformation of the first elastic deformation portion, and the second elastic deformation portion is covered via a second space allowing deformation of the second elastic deformation portion. At the same time, remove the retaining part And a structure that dampens vibration generated in the concrete structure by inhibiting movement of the retaining portion by deformation of the first elastic deformation portion or the second elastic deformation portion. The vibration can be effectively damped with a simple structure. Moreover, it can function effectively for a long time by embedding the vibration damping means in the concrete.

  Preferably, the cover portion is formed integrally with the second elastic deformation portion, and the cover portion continuously covers the first and second elastic deformation portions and the retaining portion, and the cover portion Is formed of a single member to reliably protect the first and second elastic deformation portions and the retaining portion.

  Or the said cover part consists of the 1st cover part shape | molded integrally with the said 1st elastic deformation part, and the 2nd cover part shape | molded integrally with the said 2nd elastic deformation part, The outer end part of the said 1st cover part And the inner end of the second cover part are joined to continuously cover the first and second elastic deformation parts and the retaining part, the cover part is composed of two members, Shorten the overall length to reduce the mounting space, reduce the amount of filler used to embed vibration damping means, and reduce costs.

  Preferably, the first elastic member is embedded by embedding a steel seat plate inside the vibration damping means, that is, by embedding a steel seat plate inside the first elastic deformation portion constituting the coupling damping means. The deformation is reliably deformed to attenuate the vibration.

  According to the earthquake-resistant joint structure according to the present invention, it is possible to appropriately dampen bidirectional vibrations in the direction in which adjacent concrete structures are separated and in the direction in which they approach by the vibration damping means provided at the end of the connecting member.

  Further, the vibration damping means has a simple structure mainly combining rubber members, and is embedded in a concrete structure, whereby the rubber members can cooperate to effectively attenuate vibrations.

The figure which shows the outline | summary at the time of applying the earthquake-resistant joint structure which concerns on this invention to a seawall. The horizontal direction expanded sectional view which shows the earthquake-resistant joint structure of FIG. The vertical direction expanded sectional view which shows the earthquake-resistant joint structure of FIG. The exploded perspective view of a vibration damping means. The expanded sectional view of a vibration damping means. The expanded sectional view which shows a deformation | transformation of the 1st elastic deformation part which comprises a vibration damping means. The expanded sectional view which shows a deformation | transformation of the 2nd elastic deformation part which comprises a vibration damping means. The horizontal direction expanded sectional view which shows the other example of an earthquake-resistant joint structure. The disassembled perspective view which shows the other example of a vibration damping means. The expanded sectional view which shows the other example of a vibration damping means. The figure which shows the outline | summary at the time of applying the earthquake-resistant joint structure which concerns on this invention to a box culvert.

  Hereinafter, an optimum embodiment of the earthquake-resistant joint structure according to the present invention will be described with reference to FIGS.

<Basic structure of earthquake-resistant joint structure>
FIGS. 1 to 3 and 8 show examples in which the seismic joint structure according to the present invention is applied to the connection of a pair of adjacent concrete unit wall members (concrete structures C and C ′) constituting a seawall. ing. FIG. 11 shows an example in which the seismic joint structure according to the present invention is applied to the connection between a pair of adjacent concrete box culverts (concrete structures C and C ′). In the present embodiment, for convenience of explanation, the description will be made using an example applied to the connection between the unit wall members of the seawall. It can be applied to the connection of concrete structures that require seismic functions such as the connection of concrete girders and the connection of concrete slabs.

  As shown in FIGS. 1 to 3, the seismic joint structure according to the present invention has a pair of concrete unit wall members adjacent to each other supported by a concrete column P, that is, a pair of adjacent concrete structures C and C ′. Are provided with vibration damping means 2 at the ends 1a at both ends in the longitudinal direction of the connecting member 1, and the vibration damping means 2 are provided in the concrete structures C and C '. The basic structure is the structure embedded in each. In addition, 12 in FIG. 1 thru | or FIG. 3 is a buffering material which prevents the collision with the concrete structures C and C 'and the pillar P. FIG.

  More specifically, as shown in FIGS. 2 and 3, first, one end 1a of the connecting member 1 is inserted into the concrete structure C through the insertion hole 9 formed in the concrete structure C. The vibration damping means 2 is provided at the one end 1a. Further, the other end 1a of the connecting member 1 is disposed in an attachment recess 11 that is recessed in the concrete structure C ′ through an insertion hole 9 formed in the concrete structure C ′, and is connected to the other end 1a. Vibration damping means 2 is provided.

  Next, as shown in FIG. 5 and the like, the vibration dampening means 2 is embedded by filling and curing a filler 13 that has good adhesiveness with concrete such as non-shrink mortar and surely hardens in the mounting recess 11. To do. Thereby, the vibration damping means 2 is embedded in the concrete structures C and C ′, respectively.

  Further, in the earthquake-resistant joint structure according to the present invention, as shown in FIG. 8, vibration damping means 2 is provided only at one end portion 1a of the connecting member 1, and the vibration damping means 2 is provided in the concrete structure C. A structure in which the vibration damping means 2 is embedded in the concrete structure C through the filler 13 as shown in FIG.

  As shown in FIG. 8, when the vibration damping means 2 is provided only at one end 1a of the connecting member 1, the other end 1a is fixed to the adjacent concrete structure C '. In FIG. 8, a female screw groove is formed in the mounting hole 14 provided in the concrete structure C ′, a male thread is formed on the other end 1 a of the connecting member 1, and the end 1 a is formed in the mounting hole 14. Although an example of fixing by screwing is shown, the fixing method is not particularly limited as long as the other end 1a of the connecting member 1 can be fixed.

  As described above, the vibration damping means 2 included in the earthquake-resistant joint structure according to the present invention is surrounded and restrained by the filler 13 in any case, and is embedded in the concrete structure C (C ′).

  Preferably, a steel seat plate 15 is embedded inside the vibration damping means 2. That is, by embedding and backing up the steel seat plate 15 inside the first elastic deformation portion 3 constituting the connection damping means 2, the deformation of the first elastic deformation portion 3 to be described later is ensured.

<Basic configuration of vibration damping means>
Next, the vibration damping means 2 will be described. 4 to 7 show a first example of the vibration attenuating means 2, and FIGS. 9 and 10 show a second example of the vibration attenuating means 2. The first example and the second example are mainly covered. The configuration of the unit 5 is different. Details will be described later.

  As described above, the vibration damping means 2 embedded in the concrete structure C (C ′) is provided at the end 1 a of the connecting member 1 as shown in FIGS. 4, 5, 9, and 10. The retaining portion 4, the first elastic deformable portion 3 made of rubber disposed inside the retaining portion 4 (center side of the connecting member 1), and the outer side (end surface side of the connecting member 1). A rubber second elastic deformation portion 7 and a rubber cover portion 5 that covers the retaining portion 4 and the first and second elastic deformation portions 3 and 7 are provided.

  Further, the cover portion 5 covers the first elastic deformation portion 3 through a first space 6 that allows deformation of the first elastic deformation portion 3, and the second elastic deformation portion 7 is covered with the second elastic deformation portion 7. And the cover 4 is movable inward and outward, that is, movable toward the first elastic deformation portion 3 side or the second elastic deformation portion 7 side. It has the structure to do.

  As the retaining portion 4, for example, as shown in FIGS. 4 and 5, a double nut screwed into the end portion 1 a of the connecting member 1 is used. The double nut is used to prevent loosening against vibration, thereby effectively preventing the connecting member 1 from coming off. Alternatively, the end portion 1a of the connecting member 1 may be partially processed to have a larger diameter than the end portion 1a, and the retaining portion 4 integrated with the end portion 1a may be used.

  The rubber first and second elastic deformation parts 3 and 7 and the cover part 5 are made of chloroprene rubber, styrene butadiene rubber, isoprene rubber, butyl rubber, ethylene propylene rubber, natural rubber, nitrile rubber, urethane rubber, etc. A polymer material or the like is used alone or in combination as a basic material and molded by press molding. The same applies to the second example described later.

<Specific configuration of first example of vibration damping means>
As shown in FIGS. 4 and 5, the first elastic deformation portion 3 in the present example has a cylindrical shape having a peripheral wall portion 3 b fitted to the end portion 1 a of the connecting member 1, and the inner end portion 3 a in a flange shape. It is the structure to form.

  The second elastic deformation portion 7 has a columnar shape, and is arranged so that the end surface of the inner end portion 7 a abuts the end surface of the end portion 1 a of the connecting member 1.

  As shown in FIGS. 4 to 7, the vibration damping means 2 in this example includes a cover portion 5 integrated with the second elastic deformation portion 7.

  That is, the cover portion 5 opens the inner end portion 5a and closes the outer end portion 5c, and the second elastic deformation portion 7 is formed integrally with the outer end portion 5c. The cover portion 5 has a cylindrical shape having a peripheral wall portion 5 b that covers the second elastic deformation portion 7, the retaining portion 4, and the first elastic deformation portion 3 in order from the outer end portion 5 c side.

  As shown in the figure, the cover of each part by the cover part 5 is as follows. That is, the cover of the second elastic deformation portion 7 is covered through the annular second space 8, and the cover of the retaining portion 4 is covered by being loosely fitted to the peripheral portion of the retaining portion 4. In the cover of the first elastic deformation part 3, the cover is covered via the annular first space 6. Further, a step portion is formed at the opening edge which is the inner end portion 5 a of the cover portion 5, and the step portion covers the edge portion of the flange-shaped inner end portion 3 a of the first elastic deformation portion 3, This prevents the filler 13 from entering the interior space.

  Thus, as shown in FIG. 6, the vibration damping means 2 having the configuration described above vibrates in the direction in which a pair of adjacent concrete structures C and C ′ are separated (right direction in FIG. 6: see arrow F). In this case, the peripheral wall portion 3b of the first elastic deformation portion 3 is deformed so as to bulge out in the first space 6 to absorb and attenuate the vibration.

  That is, when the concrete structure C (C ′) moves in the direction of arrow F in FIG. 6 due to vibration, the concrete structure C (C ′) is arranged to be freely movable in the vibration damping means 2 constrained in the concrete structure C (C ′). The retaining portion 4 is moved inward (left side in FIG. 6), and the vibration generated in the concrete structures C and C ′ by suppressing this movement by the bulging deformation of the first elastic deformation portion 3. Attenuate. More specifically, the end surface of the inner end portion 4a of the retaining portion 4 is in pressure contact with the end surface of the outer end portion 3c of the first elastic deformation portion 3, and the peripheral wall portion 3b of the first elastic deformation portion 3 is formed in a convex arc shape by the pressure contact. The first elastically deforming portion 3 itself is retracted by being deformed so as to bend, thereby suppressing the movement of the retaining portion 4 and damping the vibration.

  Conversely, as shown in FIG. 7, when the adjacent pair of concrete structures C and C ′ vibrate in the approaching direction (left direction in FIG. 7: see arrow F), the second elastic deformation portion 7 The peripheral wall portion 7b is deformed so as to bulge out in the second space 8 to absorb and attenuate the vibration.

  That is, the concrete structure C (C ′) is prevented from moving relative to the outside (right side in FIG. 7) of the retaining portion 4 due to vibration by the bulging deformation of the second elastic deformation portion 7 to thereby prevent the concrete structure. The vibration generated in the objects C and C ′ is damped. More specifically, the end surface of the end portion 1a of the connecting member 1 that moves together with the retaining portion 4 comes into pressure contact with the end surface of the inner end portion 7a of the second elastic deformation portion 7, and the peripheral wall portion of the second elastic deformation portion 7 by the pressure contact. The second elastic deformation part 7 itself is retracted by deforming so that the diameter of 7b expands, thereby suppressing the movement of the retaining part 4 and damping the vibration.

  As described above, the vibration damping means 2 in the earthquake-resistant joint structure of the present invention absorbs and attenuates vibration mainly by the deformation of the first elastic deformation portion 3 and the deformation of the second elastic deformation portion 7. In addition, the cover portion 5 that covers these elastically deformable portions 3 and 7 is also made of rubber and can be elastically deformed, and with respect to vibration at an angle different from the direction indicated by the arrow F in FIGS. The vibration can be absorbed and damped in cooperation with the elastic deformation portions 3 and 7.

  6 and 7, the deformation of the first elastic deformation portion 3 and the second elastic deformation portion 7 at one end 1 a is described. However, vibration attenuation is applied to the end portions 1 a at both ends of the connecting member 1. Needless to say, when the means 2 is provided, the two first elastic deformation portions 3 or the two second elastic deformation portions 7 work in the same manner.

<Specific configuration of second example of vibration damping means>
In the second example of the vibration damping means 2 shown in FIGS. 9 and 10, unlike the first example described above, the first elastic deformable portion 3 is integrated with the first elastic deformable portion 3. One cover portion 5A covers the second elastic deformation portion 7 with a rubber second cover portion 5B integrated with the second elastic deformation portion 7, and the outer end portion 5Ac of the first cover portion 5A. And the inner end portion 5Ba of the second cover portion 5B are joined, and the retaining portion 4 is covered by the second cover portion 5B. Thus, by dividing the cover 5 into the first cover 5A and the second cover 5B, the volume of the mounting recess 11 serving as the mounting space is reduced, and the amount of filler 13 used to fill the mounting recess 11 is used. To reduce costs.

  When describing each part in detail, the first elastic deformation part 3 in this example has a cylindrical shape having a peripheral wall part 3b fitted to the end part 1a of the connecting member 1 and extends from the inner end part 3a. One cover portion 5A is integrally formed. An annular first space 6 is defined between the peripheral wall portion 5Ab of the first cover portion 5A and the peripheral wall portion 3b of the first elastic deformation portion 3. Further, the annular end surface of the outer end portion 3 c of the first elastic deformation portion 3 comes into contact with the end surface of the inner end portion 4 a of the retaining portion 4.

  Further, the second elastic deformation portion 7 in the present example has a cylindrical shape and is configured to integrally form a cylindrical second cover portion 5B extending from the outer end portion 7c. An annular second space 8 is defined between the peripheral wall portion 5Bb of the second cover portion 5B and the peripheral wall portion 7b of the second elastic deformation portion 7. Further, the end surface of the inner end portion 7 a of the second elastic deformation portion 7 faces the end surface of the outer end portion 4 b of the retaining portion 4 with a gap.

  Moreover, about joining of outer end part 5Ac of 5 A of 1st cover parts, and inner end part 5Ba of 2nd cover part 5B, in order to prevent the inflow of the filler 13, as shown in FIG. Step portions are formed in the portions 5Ac and 5Ba, and the respective step portions are overlapped and joined. It is desirable to join the joint portion via an adhesive as necessary, and to securely join the first cover portion 5A and the second cover portion 5B by tightening the periphery of the joint portion with a binding band or the like.

  Since the vibration attenuation due to the deformation of the first elastic deformation portion 3 and the second elastic deformation portion 7 is the same as in the case of the first example described with reference to FIGS. 6 and 7, the description is omitted here. However, the deformation of the second elastic deformation portion 7 of this example is performed by the end surface of the outer end portion 4 b of the retaining portion 4 being in pressure contact with the end surface of the inner end portion 7 a of the second elastic deformation portion 7. In addition, since the end faces of the both end portions 4b and 7a face each other with a space therebetween, there may be a slight time lag between the occurrence of vibration and the press contact, or the press contact may not be performed. The facing distance between the end faces of the both end portions 4b and 7a can be appropriately adjusted according to the life of the second elastic deformation portion 7, the required degree of vibration damping, and the like.

  As described above, the earthquake-resistant joint structure according to the present invention is bidirectional in the direction in which the adjacent concrete structures C and C ′ are separated and approached by the vibration damping means 2 provided at the end 1a of the connecting member 1. Can be properly damped.

  Further, the vibration damping means 2 is a simple structure in which mainly rubber members (first elastic deformation portion 3, second elastic deformation portion 7, cover portion 5) are combined, and the concrete structures C and C ′ are provided. By being embedded, the rubber members can cooperate to effectively attenuate vibrations.

DESCRIPTION OF SYMBOLS 1 ... Connecting member, 1a ... End part, 2 ... Vibration damping means, 3 ... First elastic deformation part, 3a ... Inner end part, 3b ... Peripheral wall part, 3c ... Outer end part, 4 ... Retaining part, 5 ... Cover Part, 5a ... inner end part, 5b ... peripheral wall part, 5c ... outer end part, 5A ... first cover part, 5Aa ... inner end part, 5Ab ... peripheral wall part, 5Ac ... outer end part, 5B ... second cover part, 5Ba ... Inner end portion, 5Bb ... Peripheral wall portion, 5Bc ... Outer end portion, 6 ... First space, 7 ... Second elastic deformation portion, 7a ... Inner end portion, 7b ... Peripheral wall portion, 7c ... Outer end portion, 8 ... Second space, 9 ... insertion hole, 11 ... mounting recess, 12 ... cushioning material, 13 ... filler, 14 ... mounting hole, 15 ... seat plate, C, C '... concrete structure (unit wall member or box culvert) , P ... pillar, F ... vibration direction.

Claims (4)

  In a seismic joint structure comprising a rod-like connecting member for connecting a pair of adjacent concrete structures, provided with vibration damping means at least at one end of the connecting member, and embedding the vibration damping means in the concrete structure The vibration damping means includes a retaining portion that moves together with an end portion of the connecting member, a rubber first elastic deformation portion disposed inside the retaining portion, and a rubber first portion disposed on the outer side. A second elastic deformation portion, and a rubber cover portion covering the retaining portion and the first and second elastic deformation portions, the cover portion deforming the first elastic deformation portion with respect to the first elastic deformation portion. The second elastic deformation portion is covered through a second space that allows deformation of the second elastic deformation portion, and the retaining portion can be moved inward and outward. With a structure to cover Seismic joint structure characterized in that the arrangement for attenuating the vibration generated in the concrete structure by inhibiting the movement of the locking portion by the first elastic deformation portion and the deformation of the second elastic deformation portion missing.   2. The cover part is formed integrally with the second elastic deformation part, and the first and second elastic deformation parts and the retaining part are continuously covered with the cover part. Earthquake-resistant joint structure.   The cover portion includes a first cover portion molded integrally with the first elastic deformation portion, and a second cover portion formed integrally with the second elastic deformation portion, and an outer end portion of the first cover portion; The seismic joint structure according to claim 1, wherein the inner end portion of the second cover portion is joined to continuously cover the first and second elastic deformation portions and the retaining portion.   The seismic joint structure according to any one of claims 1 to 3, wherein a steel seat plate is embedded inside the vibration damping means.

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