JP3465105B2 - Connection structure between base-isolated building and ground - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion joint.

[0002]

2. Description of the Related Art Our company has developed a structure, as shown in FIG. 19, for connecting a base-isolated building A and a ground B through an expansion joint J as shown in FIG.

The expansion joint J is shown in FIG.
As shown in FIG. 19, a joint main body 90, which comprises alternating load supporting members 90a and leaf spring members 90b and is expandable and contractible by elastic deformation of the leaf spring member 90b, is arranged above the joint main body 90. In addition, an expandable and contractible plate-like covering material 91 made of an elastic member, the joint main body 90 and the covering material
And a top plate 92 interposed between the base material 91 and the top plate 92. One end side of the surface covering material 91 is on the seismic isolation structure A side, and the other end side is on the ground B.
Side, and the joint main body
Only one end of 90 is attached to one of the seismic isolation structure A or the ground B, and the joint main body 1 is installed so that it can be received by the step-down surface b2 of the ground B.

When the above-mentioned structure is adopted, there are excellent effects such as excellent load resistance and no step.

However, in the joint J, the upper and lower leaf spring members 90b, 90b may contact and interfere with each other at the time of large compression, which may adversely affect the compression performance of the joint. One means to prevent this is a leaf spring member.
It is conceivable to reduce the bending radius of 90b and arrange the leaf spring members 90b and 90b so that they do not interfere with each other.
However, in this case, the amount of deformation of one leaf spring member 90b is small, so if the joint main body 1 tries to secure the same amount of deformation, the number of leaf spring members 90b and load supporting members 90a must be increased. . Therefore, with this means, the thickness of the joint is not increased, but the weight is increased and the width of the joint main body 1 (dimension in the expansion / contraction direction) is increased due to the increase in the number of the load supporting members 90a.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an expansion joint in which the compression performance is not deteriorated even at the time of large compression without increasing the width and weight of the joint body.

[0007]

[Means for Solving the Problems] (Invention according to claim 1) The seismic isolated building of the present invention and the ground are connected to each other by a plurality of expansion joints J arranged at regular intervals. A structure for connecting A and ground B,
The expansion joint J includes at least a joint main body 1 formed by alternately connecting a load support member 10 and a leaf spring member 11, and a plate-shaped cover material 2 arranged above the joint main body 1. Joint subject 1
Are configured by connecting the one end side portions and the other end side portions in the horizontal direction of the adjacent load supporting members 10 via the leaf spring members 11, respectively, and each leaf spring member 11
Is formed in a generally U-shape or a substantially arcuate shape in plan view, which is concave and curved inward.

(Invention of Claim 2) The connection structure between the base-isolated building and the ground of the present invention relates to the invention of Claim 1 and is formed of a steel plate between the joint main body 1 and the facing material 2. A plurality of formed top plates 3 are interposed.

The function of the expansion joint of the present invention will be clarified in the section of the following embodiments of the invention.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (Regarding Embodiment 1) FIGS. 1 and 2 show a structure in which a seismic isolated building A and a ground B are connected via an expansion joint J.

In this structure, as shown in FIGS. 1 and 2, the projecting portion a on the seismic isolated building A side is allowed to enter the open and cut portion b on the ground B side without interfering with each other, and the projecting portion a Stepped surface a1
The expansion joint J is mounted and bolted to the space formed by the tip portion a2, the vertical wall b3 of the cut-and-cut portion b, and the step-down surfaces b1 and b2. Note that FIG.
In the figure, the one indicated by the symbol C is a seismic isolation device for imparting a seismic isolation function to a building, and the seismic isolation device is basically constructed by alternately laminating and fixing steel plates and rubber plates. Has been done. The members constituting the expansion joint J will be described in detail below. [Overall structure of expansion joint J]
The expansion joint J, as shown in FIG.
The joint main body 1, the covering materials 2a, 2b, 2c, 2d (covering material 2) arranged above the joint main body 1, and the top plate 3 interposed between the joint main body 1 and the covering material 2.
It comprises (top plates 3a, 3b) and a sliding plate S made of stainless steel for smoothing the expansion and contraction of the joint main body 1. [Structure of Joint Main Body 1 ] Joint Main Body 1
As shown in FIGS. 3 and 4, two units U are fixed to each other, and a mounting bracket 12 is fixed to one unit U. As shown in FIG. 3 and FIG. 4, the unit U is configured by connecting the horizontal one end side portions and the other end side portions of the pair of load supporting members 10 and 10 via the leaf spring members 11, respectively. At the same time, each leaf spring member 11 is formed in a generally arcuate shape in plan view which is concave and curved inward.

Here, as shown in FIG. 3, the joint main body 1 is arranged in a space formed by the tip a2 of the protrusion a and the vertical wall b3 of the excavation part b, and is mounted as shown in FIG. A horizontal piece of the mounting bracket 12 is bolted to the step-down surface b1, and the load supporting member 10 on the opposite side of the mounting bracket 12 is brought into contact with the tip a2 in a free state as shown in FIG. Further, as shown in FIG. 11, the joint main body 1 is arranged at a constant pitch in the longitudinal direction of the space formed by the tip a2 of the protrusion a and the vertical wall b3 of the cut-and-cut portion b.

When the length of the joint main body 1 is increased in order to increase the amount of expansion and contraction, the number of the units U may be three, four or more. [Construction of Outer Materials 2a, 2b, 2c, 2d (Outer Material 2)]
As shown in FIG. 3, the cover material 2 is used for mounting.
It is composed of a and 2b and intermediate cover materials 2c and 2d,
Each surface material 2a, 2b, 2c, 2d can be integrated with each other by a bolt B1, and the integrated one is a stepped surface a
The high nuts N and the bolts BT embedded in 1 and b1 can be used for fixing.

As shown in FIGS. 6 and 7, the cover material 2a has a long strip-shaped main body 20a made of rubber (for example, chloroprene rubber) and thin long holes M1 and M2 on the upper and lower surfaces of the main body 20a. The thin film portion 21a formed and provided, the mounting metal fitting 22a provided on one edge side of the main body 20a, the connection metal fitting 23a provided on the other edge side of the main body 20a, and one end side of the main body 20a. A convex portion 24a and a concave portion 25a provided on the other end side of the main body 20a. The mounting bracket 22a is provided with elongated holes H1 at predetermined intervals and the main body corresponding to the elongated hole H1. Bolt insertion hole H2 is provided in 20a part,
Circular holes h1 are provided in the connecting fitting 23a at predetermined intervals, and bolt insertion holes h2 are provided in the main body 20a portion corresponding to the circular holes h1.

As shown in FIGS. 5 and 9, the covering material 2b has a long strip-shaped main body 20b made of rubber (for example, chloroprene rubber) and thin long holes M1 and M2 on the upper and lower surfaces of the main body 20b. The thin film portion 21b formed and provided, the mounting metal fitting 22b provided on one edge side of the main body 20b, the connecting metal fitting 23b provided on the other edge side of the main body 20b, and one end side of the main body 20b. A convex portion 24b and a concave portion 25b provided on the other end side of the main body 20b. The mounting hardware 22b is provided with elongated holes H1 at a predetermined interval and the main body corresponding to the elongated hole H1. Bolt insertion hole H2 is provided in 20a part,
Screw holes h3 are provided at predetermined intervals in the metal fitting 23b for connection.

As shown in FIGS. 3 and 8, the cover material 2c has a long strip-shaped main body 20c made of rubber (for example, chloroprene rubber) and thin long holes M1 and M2 on the upper and lower surfaces of the main body 20c. The thin film portion 21c formed and provided, the mounting metal fitting 22c provided on one edge side of the main body 20c, the mounting metal fitting 23c provided on the other edge side of the main body 20c, and one end side of the main body 20b. It is composed of a convex portion 24c and a concave portion 25c provided on the other end side of the main body 20c. The connecting metal fitting 22c is provided with circular holes h1 at predetermined intervals and the main body corresponding to the circular hole h1. There is a bolt insertion hole h2 at 20a,
Further, screw holes h3 are provided in the connection fitting 23c at predetermined intervals.

The cover material 2d is basically the same as the cover material 2c, except that the width is increased and the number of rows of the thin film portions 21c is increased.

When the joint main body 1 is composed of three [N] units U, the covering materials 2a, 2b, 2c, 2d
In addition, it is sufficient to add a cover material (the same kind as the cover material 2c) having a width corresponding to the length of one [N-2] unit U. [Structure of Top Plates 3a, 3b (Top Plate 3)] Top Plates 3a, 3b
Is made of a steel plate, and as shown in FIG. 3, is placed so as to contact the upper end of the load supporting member 10 of the joint main body 1. As shown in FIGS. 5 and 6, the top plates 3a and 3b are made of thin steel plate material 39 integrated with the top plates 3a and 3b by bolts BT.
It is positioned so as to be fastened together with the outer covering materials 2a and 2b.

When the joint main body 1 is longer than that of this embodiment, it is preferable to dispose a top plate independent of the top plates 3a and 3b at the center of the joint main body 1. [Regarding the Positional Relationship between the Cover Material 2 and the Top Plate 3 ] As shown in FIG. 10, the top plate 3 is arranged so as to press the end portion in the length direction of the top plate 3 at the central portion in the length direction of the cover material 2. . Therefore,
The joints between the cover materials 2 and 2 do not become uneven. [Basic of expansion joint J of this embodiment]
Function] Dimensions of expansion joint J when installed (Fig. 1
2, see Fig. 13) ・ Cover material 2: width 965mm, thickness 50mm ・ joint body 1: 760mm × 470mm, thickness 1
When the compressed state is 50 mm, as shown in FIGS. 14 and 15, the deformation region in the elastic region is secured by the leaf spring member 11, and the load support member 10 is not plastically deformed. In this state, the cover material 2 is elastically deformed to a state in which it is swollen slightly upward. Also, 400
Even after the mm-compressed state, it can be restored after the earthquake and can be used continuously. When compressed by 400 mm or more, the load supporting member 10 is plastically deformed. As shown in FIGS. 16 and 17, when in the pulled state, the joint main body 1 does not deform, and the space between the left end portion and the tip end portion a2 of the joint main body 1 gradually opens. On the other hand, the covering material 2 gradually extends against the biasing force. It is clear that the structure adopting the expansion joint J does not adversely affect the building due to the expansion and contraction functions shown in the above items. Further, since the expansion joint J is capable of expanding and contracting / sliding, although not shown, it is also possible to absorb shear deformation in the event of an earthquake.

Further, the joint main body 1 is formed by coupling the load supporting members 10, 10 adjacent to each other through a leaf spring member 11 formed in a generally arcuate shape in a plan view, and the protrusion a Since the space formed by the tip portion a2 and the vertical wall b3 of the cut-and-cut portion b is arranged with a relatively large gap in the longitudinal direction, the bending diameter of the leaf spring member 11 can be increased without increasing the thickness of the joint main body 1. Also, the space between the leaf spring members 11, 11 facing each other can be made large, and the number of load supporting members 10 can be further reduced. Therefore, when the structure of the joint main body 1 is adopted, it is possible to provide an expansion joint without increasing the thickness and weight of the joint main body 1 and in which the compression performance is not deteriorated even at the time of large compression. (Regarding Other Embodiments) When the joint main body 1 is composed of a large number of units U, there is a tendency that the joint main body 1 is largely curved upward during compression. As shown in FIG. 18, it is preferable to provide a lifting prevention mechanism 5 that prevents lifting of the middle part of the joint main body 1.

As shown in FIG. 18, for example, the floating prevention mechanism 5 includes a socket 50 fixed on the sliding plate S and a round bar 51 fixed on the load supporting member 10 of the joint main body 1.
And a bolt 52 screwed into the socket 50, and a pressing plate 53 screwed by the bolt 52 and the socket 50. In the first embodiment, the joint main body 1 is the unit U.
Although the mounting bracket 12 is provided in the above, the mounting bracket 12 may be omitted.
That is, even if only the joint main body 1 including only the plurality of units U is housed in the space formed by the tip a2 of the protrusion a and the vertical wall b3 of the cut-and-cut portion b, the same function is provided. In place of the first embodiment described above, the joint main body 1 is configured by connecting the one end side portions and the other end side portions in the horizontal direction of the load supporting members 10, 10 adjacent to each other through the leaf spring members 11, respectively. In addition, each leaf spring member 11 may be formed in a substantially U shape in a plan view, which is concave and curved inward. In the first embodiment, the joint main body 1 is configured by connecting a plurality of units U,
The joint main body 1 is composed of (load supporting member 10)-(leaf spring members 11, 11)-(load supporting member 10)-(load supporting member 10).
-(Leaf spring members 11, 11)-(load supporting member 10) are arranged in this order, but the above-mentioned [(load supporting member 10)-(load supporting member 10)] solves the problem. It corresponds to the load supporting member in the column of means for doing.

[0022]

The present invention having the above-mentioned structure has the following effects.

From the contents described in the embodiment of the invention, it is possible to provide an expansion joint in which the compression performance is not deteriorated even at the time of large compression without increasing the width and weight of the joint body.

[Brief description of drawings]

FIG. 1 is a front view showing a structure that connects a base-isolated building and the ground in an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a front view of an expansion joint used in the above structure.

FIG. 4 is a perspective view of an expansion joint used in the above structure.

FIG. 5 is an enlarged front view of the right side portion of the expansion joint.

FIG. 6 is an enlarged front view of a left side portion of the expansion joint.

FIG. 7 is a perspective view of a cover material of the expansion joint on the seismic isolated building side.

FIG. 8 is a perspective view of a cover material at an intermediate portion of the expansion joint.

FIG. 9 is a perspective view of a ground-side facing material of the expansion joint.

FIG. 10 is a plan view showing a positional relationship between the expansion joint and a top plate and a covering material.

FIG. 11 is a plan view showing the arrangement of the expansion joints mainly of the joints.

FIG. 12 is a front view showing the dimensions of the expansion joint.

FIG. 13 is a plan view showing an arrangement dimension of the expansion joint mainly of the expansion joint.

14 is a front view showing a state in which the expansion joint is compressed and deformed from the state of FIG. 3.

15 is a front view showing a state where the expansion joint is further compressed and deformed from the state of FIG.

16 is a front view showing a state in which the expansion joint is pulled and deformed from the state of FIG. 3.

FIG. 17 is a front view showing a state where the expansion joint is further pulled and deformed from the state of FIG. 16.

FIG. 18 is a front view of the lifting prevention mechanism.

FIG. 19 is a cross-sectional view showing a prior art expansion joint connecting a base-isolated building and the ground.

[Explanation of symbols]

J expansion joint 1 joint 2 exterior materials 3 Top plate 10 Load support member 11 Leaf spring member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-260408 (JP, A) Actual Open Sho 52-67743 (JP, U) Actual Open Sho 53-161530 (JP, U) Japanese Patent Sho 44- 11862 (JP, B1) JP-B 52-32173 (JP, B1) JP-B 41-2348 (JP, B1) JP-B 57-2487 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04B 1/62

Claims (2)

(57) [Claims] 1. A structure in which a seismic isolated building (A) and a ground (B) are connected to each other by a plurality of expansion joints (J) arranged in parallel at regular intervals, and at least the expansion joint (J) is provided. , Load bearing members (1
0) and a leaf spring member (11) are alternately coupled to each other, and a joint main body (1), and a plate-shaped cover material (2) arranged above the joint main body (1). The main body (1) is configured such that the one end side portions and the other end side portions in the horizontal direction of the adjacent load supporting members (10) are coupled to each other via the leaf spring members (11), and each plate is also configured. The connection structure between a base-isolated building and the ground, wherein the spring member (11) is formed in a generally U-shape or a substantially arc shape in plan view which is concave and curved inward. 2. The seismic isolation system according to claim 1, wherein a plurality of top plates (3) made of steel plates are interposed between the joint main body (1) and the facing material (2). Connection structure between building and ground.