JP3467620B2 - Bridge expansion joints - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As an expansion joint for bridges, for example, FIG.
There is something like.

In this expansion joint, as shown in FIG. 22, an elastic body 9 is installed between bridge girders H, H and the elastic body 9 is
Is installed so that the end portion of each of them is anchored to each bridge girder H by anchor bolts, and the elastic body 9 is expanded by the expansion / contraction deformation amount thereof. And a space K is provided in the elastic body 9 so as to overlap both bridge girders H in a plan view, and holding members 92 having a U-shaped cross section are opposed to the open ends at both ends of the space K. Then, both ends of the top plate member 93 are fitted into the open portions of the holding members 92, 92 with a pushing margin and a withdrawing margin, and both ends of the top plate member 93 are fixed to the respective holding members 92 with bolts 94. ing.

Therefore, in this expansion joint, when there is a large amount of approaching / separating movement between the bridge girders H, H, the bolt 94 which is the top plate fastening member at a certain point in the expansion / contraction area by the shear deformation portion SH. Breaks and the ends of the top plate member 93 move relative to the holding member 92 in a manner of being inserted and removed, and as a result, large relative movements between the bridges H and H can be absorbed.

However, in the expansion joint, the bridge H,
Since the relative movement force between the Hs acts as the shearing force (breaking force) of the bolt 94 via the shearing deformation portion SH that elastically deforms, the breaking displacement amount (the expansion and contraction amount of the designed expansion joint where the bolt breaks). The input load acting on the actual bolt varies greatly, and therefore the bolt 94 breaks before the set breaking displacement amount is reached, or the bolt 94 breaks even if the set breaking displacement amount is exceeded. The situation that does not happen occurs. Even if the strength of the bolt 94 itself varies, the same situation as described above occurs. If the bolt 94 breaks before it reaches the breaking displacement set as described above, it is naturally a problem in use. However, due to an earthquake or the like, there is a large approach / separation movement between the bridge girders H and H. If the bolt 94 does not break even when the set breaking displacement exceeds the set breaking displacement, other bridge members may be damaged, which may be fatal to the bridge. In addition, the presence of expansion joints that remain without breaking in a seismically isolated bridge may impair the seismic isolation function of the bridge.

[0006]

Therefore, in the present invention, a large amount of approaching / separating movement between bridge girders H, H can be absorbed, and the top plate connecting portion is broken before the set breaking displacement amount is reached. It is an object of the present invention to provide an expansion joint for a bridge that does not and that reliably breaks the top plate connecting portion with a set breaking displacement amount.

[0007]

[Means for Solving the Problems] [Claim 1] The bridge expansion joint according to the present invention is a bridge girder H facing each other.
And a rigid mounting plate 13 anchored to the bridge girder H or abutment, respectively, a rigid top plate 2 arranged so as to overlap both mounting plates 13 and 13 in plan view, the mounting plate 13 and the top plate 2 And an elastic shearing deformation part (10) for integrally coupling the overlapping parts with each other in a plan view, wherein the shearing deformation part (10) on at least one side has a mounting plate (13) or / and A hard plate 11 serving as a mounting portion to the top plate 2 is fixed, and the mounting plate 13 or / and the top plate 2 and the hard plate 11 are joined together, and the hard plate 11 is bridged by a restricting means 4. When the movement range in the axial direction is regulated and the amount of approach / separation between the bridge girder H and the bridge girder H or abutment is larger than the regulated movement amount of the hard plate 11, the mounting plate 13 or / and the ceiling The joint between the plate 2 and the hard plate 11 is broken. [Invention of Claim 2] In the expansion joint for bridge of the present invention, as for the invention of Claim 1, the connection between the mounting plate 13 or / and the top plate 2 and the hard plate 11 is the fastening member 3 or the point. It is done by welding. [Regarding the Invention of Claim 3] In the expansion joint for bridge of the present invention, at least the hard plate 11, the fastening member 3 and the restricting means 4 are made of steel in the invention of claim 2 above.

The function of the expansion joint for bridge in the above invention will be clarified in the section of the following embodiments of the invention.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] The expansion joint for bridge of this embodiment is shown in FIG.
As shown in FIG. 1, the elastic body portion 1, the top plate 2, and the fastening member 3
And the restricting means 4 and the anchor bolts 5 and the like, and are arranged so as to close the gap U between the opposing bridge girders H and H.

As shown in FIGS. 1, 3 and 4, the elastic body portion 1 is provided with a groove M at the center of the upper surface of a long rubber member extending in the direction perpendicular to the bridge, a shear deformation portion 10 on the inside, and an outer portion on the outside. Bolting portions 12 are respectively formed on the upper surface of the shear deformation portion 10 and a steel hard plate 11 is fixed to the upper surface of the shear deformation portion 10, and an L-shaped cross section is formed from the bottom portion of the shear deformation portion 10 to the bottom portion and side portions of the bolt fastening portion 12. The mounting plate 13 is embedded. The upper surface of the hard plate 11 is set lower than the upper surface of the bolted portion 12 by the thickness of the top plate 2, as shown in FIG.

As shown in FIG. 3, the hard plate 11 has a long plate shape, and frame portions 11a are formed on the inner edge of the hard plate 11 at regular intervals.

As shown in FIGS. 1 and 3, the bolt fixing portion 12 has elongated holes 12a formed in a rubber member at regular intervals, and a bolt insertion hole 13a is formed in the corresponding mounting plate 13 portion. It is set up.

As shown in FIG. 1, the top plate 2 is made of a steel load receiving plate 20 whose upper and side surfaces are covered with rubber, and is fastened by a fastening member 3.

The regulating means 4 is entirely formed of a steel plate,
As shown in FIGS. 1 and 2, a mounting plate 40 having a bolt insertion hole 42 formed in a portion corresponding to the elongated hole 12a and the bolt insertion hole 13a, and the frame portion 11a at the inner edge of the mounting plate 40. And an L-shaped engaging portion 41 including a vertical piece 41a and a horizontal piece 41b, which are arranged at the same interval. As shown in FIG. 1 and FIG. 3, the vertical piece 41a of the locking portion 41 is arranged so that the upper end edge thereof is inserted into the frame portion 11a, and the inner edge of the hard plate 11 or this The shearing deformation portion 10 is sheared in the bridge axis direction until the facing frame portion 11a (hereinafter referred to as the frame component piece 11a ') comes into contact with the vertical piece 41a directly or through the film (hereinafter simply referred to as contact). You can do it. In addition, in this embodiment, the dimensions of the symbols g1 and g2 shown in FIG. 1 are set to 50 mm.

The fastening member 3 is composed of bolts, and is set so as not to break in the deformation region of the shearing deformation portion 10 until the regulating means 4 comes into contact with the inner edge of the hard plate 11 or the frame component piece 11a '. I am doing it.

The anchor bolt 5 is, as shown in FIG.
The anchor rod 51 is bent in an L shape and the female screw body 50 is fixed to the upper end of the anchor rod 51.
a, the bolt insertion hole 13a, and the bolt B inserted through the bolt insertion hole 42 are screwed into the female screw body 50, the elastic body portion 1 and the regulating means 4 are attached to the bridge girder H.

The function of the expansion joint for bridge will be described below. When the play space U is expanded or reduced due to environmental temperature change, etc. In this case, the expansion and contraction amount of the play space U is about 50 mm. Will not come into contact with each other. Therefore,
The fastening member 3 is not broken, and the top plate 2 is the hard plate of the elastic body portion 1.
There is no such thing as leaving 11. When there is an earthquake in which the play space U expands or contracts less than 100 mm from the state of FIG. Since there is no contact, the fastening member 3 is not broken. Therefore, the expansion joint for bridge can be continuously used. When there is an earthquake in which the play space U expands or contracts by more than 100 mm from the state shown in FIG. 1, when the play space U expands in this way, as shown in FIG. 41a comes into contact, and FIG.
As shown in FIG. 7 and FIG. 7, the fastening member 3 is broken and the top plate 2 is separated from the hard plate 11 of the elastic body portion 1 on one side. In this state, the top plate 2 portion separated from the hard plate 11 is placed on the frame portion 11a as shown in FIGS. 6 and 7, and the vehicle can pass through.

On the contrary, when the clearance U is reduced, the frame component pieces 11a 'on the left and right sides contact the vertical piece 41a as shown in FIG. 8, and the fastening member 3 is broken as shown in FIG. 9 and FIG. The top plate 2 is separated from the hard plate 11 of the elastic body portion 1 on one side. In this state, the portion of the top plate 2 separated from the hard plate 11 is shown in FIG.
As shown in FIG. 3, the vehicle is placed on the hard plate 11 or the bolted portion 12, and the vehicle can pass therethrough.

In this expansion joint for bridges, as shown in FIG. 11, the input acting on the fastening member 3 when the inner edge of the frame component piece 11a 'on the left and right sides or the inner edge of the hard plate 11 and the vertical piece 41a abut. The load suddenly increases, the variation of the input load acting on the fastening member is eliminated, and the fastening member 3 is surely broken by the displacement amount at the time of contact, regardless of the variation in the strength of the fastening member itself. . [Embodiment 2] In the expansion joint for bridge of this embodiment, the hard plate 11 is formed in a U-shaped cross section as shown in Fig. 12, and the open portion of the hard plate 11 having the U-shaped cross section is formed. The end of the load receiving plate 20 is inserted and the hard plate 11 and the top plate 2 are connected by the fastening member 3. Other configurations are the same as those in the first embodiment. [Embodiment 3] The expansion joint for bridge of this embodiment has substantially the same structure as that of Embodiment 1 as shown in FIG. 14, but the locking portions 41 of the restricting means 4 facing each other are as shown in FIG. It is arranged in a staggered manner. Therefore,
Even if the locking portions 41 overlap each other in a front view, they do not interfere with each other and can be installed even in the case of a narrow gap U. [Embodiment 4] In the expansion joint for bridge of this embodiment, as shown in FIG. 15, the frame portion 11a is provided on the inner edge of the hard plate 11.
A steel locking member 44 as a restricting means is embedded in the bolting portion 12 so as to be fixed to the mounting plate 13 without adding a bolt, and as shown in FIG. When the vertical piece 41a of the locking portion 41 and the hard plate 11 come into contact with each other and the play space U is greatly reduced, as shown in FIG.
44 and the hard plate 11 are brought into contact with each other so as to exert the same function as that of the first embodiment. [Regarding Embodiment 5] The expansion joint for bridge of this embodiment is a modification of Embodiment 1 described above, and as shown in FIG. 18, only the shearing deformation portion 10 on one side is attached to the top plate 2 and the attaching portion. The hard plate 11 is fixed and the hard plate 11 and the top plate 2 are joined by the fastening member 3. That is, this expansion joint for bridge defines the side from which the top plate 2 is detached. This format can be adopted in all the embodiments other than the fifth embodiment.

It should be noted that instead of the above format, the hard plate 11 on one side is changed.
The side from which the top plate 2 or the mounting plate 13 is detached with respect to the hard plate 11 may be determined by reducing the thickness and strength of the fastening member 3 between the top plate 2 and the fastening plate 3 as compared with that on the other side. . This format can also be adopted in all other embodiments. [Embodiment 6] In the expansion joint for bridge of this embodiment, as shown in FIG. 19 and FIG. 20, a rigid plate 11 whose inner end side protrudes into the play space U is fixed to the lower portion of the shear deformation portion 10 and faces each other. The hard plates 11 and 11 are connected to each other by a substantially L-shaped link L.

In this expansion joint for bridge, when the bridge girders H and H are separated from each other and the link girders H and H are separated from each other, the bridge girders H and H approach each other. Then, when the bridge girders H, H further approach each other from the state where the inner ends of the hard plates 11, 11 are in contact with each other, a shearing force is applied to the fastening member 3. That is, in this joint, the hard plates 11, 11 and the link L constitute the regulating means 4.

In place of the link L, the hard plate 11,
11 Even if the chains or strong fibers are connected to each other, the same effect can be obtained. [Regarding Embodiment 7] As shown in FIG. 21, the expansion joint for bridge of this embodiment has a hard plate 11 at the lower part of the shear deformation portion 10.
And the hard plate 11 and the mounting plate 13 are joined together by the fastening member 3, while the load receiving plate 20 of the top plate 2 has two hits 22 at the center and 21 at both ends. , Each of them is erected.

In this expansion joint for bridges, when the bridge girders H, H are separated from each other and the hard plate 11 and the abutment 21 collide with each other through the film, the bridge girders H, H are also brought close to each other and the hard plate 11 is approached. When the contact 22 and the contact 22 collide through the film, the fastening member 3
Shearing force is applied to. In other words, in this joint, 21 and 22 are functioning as the restricting means 4. [Embodiment 8] With regard to the expansion joints for bridges of Embodiments 1 to 7 described above, the hard plates 11 are fixed above and below the shear deformation portion 10, and the hard plates 11, 11 and the mounting plate 13 and the top plate 2 are connected. It is also possible to adopt a configuration in which the fastening members 3 are used for connection. [Regarding Embodiment 9] Regarding the expansion joints for bridges of Embodiments 1 to 8 described above, it is assumed that the attachment plate 13 or / and the top plate 2 and the hard plate 11 are coupled by spot welding. it can. [Regarding Embodiment 10] Although the expansion joints for bridges of Embodiments 1 to 9 described above are installed between the bridge girders H, H, they can also be installed between the bridge girders and abutments. Even in this case, naturally, the same function is achieved.

[0024]

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 absorb a large amount of approaching / separating movement between the bridge girders H, H, and the top plate connecting portion can be connected before the set breaking displacement amount is reached. It was possible to provide an expansion joint for a bridge that does not break and surely breaks the top plate connecting portion with a set breaking displacement amount.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bridge expansion joint according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the restricting means of the expansion joint for bridge of the first embodiment is installed on a bridge girder.

FIG. 3 is a perspective view showing a state in which an elastic body portion is installed on the regulating means shown in FIG.

FIG. 4 is a perspective view showing a state in which a top plate is installed between the left and right elastic body portions shown in FIG.

FIG. 5 is a cross-sectional view showing a state where the clearance is enlarged and the mounting portion and the vertical piece of the locking portion are in contact with each other.

FIG. 6 is a cross-sectional view showing a state in which a top plate fastening member that joins the top plate and the mounting portion is broken.

FIG. 7 is a cross-sectional view showing a state in which the top plate is displaced from one mounting portion.

FIG. 8 is a cross-sectional view showing a state where the clearance is reduced and the frame component piece and the vertical piece of the locking portion are in contact with each other.

FIG. 9 is a cross-sectional view showing a state in which a top plate fastening member that joins the top plate and the mounting portion is broken.

FIG. 10 is a cross-sectional view showing a state in which the top plate is displaced from one of the mounting portions and is mounted on the bolt fastening portion.

FIG. 11 is a graph showing a relationship between an input load acting on the top plate fastening member and a displacement amount.

FIG. 12 is a sectional view of a bridge expansion joint according to a second embodiment of the present invention.

FIG. 13 is a perspective view showing a state in which the restricting means of the expansion joint for bridge of Embodiment 3 of the present invention is installed on a bridge girder.

FIG. 14 is a cross-sectional view of the expansion joint for bridge of the third embodiment.

FIG. 15 is a sectional view of a bridge expansion joint according to a fourth embodiment of the present invention.

FIG. 16 is a cross-sectional view showing a state where the play space is enlarged and the attachment portion and the vertical piece of the locking portion are in contact with each other.

FIG. 17 is a cross-sectional view showing a state where the clearance is reduced and the mounting portion and the locking member are in contact with each other.

FIG. 18 is a cross-sectional view of the expansion joint for bridge of the fifth embodiment.

FIG. 19 is a cross-sectional view of a bridge expansion joint according to Embodiment 6 of the present invention.

FIG. 20 is an explanatory diagram of a link according to the sixth embodiment.

FIG. 21 is a cross-sectional view of a bridge expansion joint according to Embodiment 7 of the present invention.

FIG. 22 is a cross-sectional view of a conventional expansion joint for bridges.

[Explanation of symbols]

H bridge girder 2 Top plate 3 fastening members 4 Regulation means 10 Shear deformation part 11 hard plate 13 Mounting plate

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-8-260408 (JP, A) JP-A-9-78513 (JP, A) Actual development Sho-56-54135 (JP, U) Actual public 45- 13572 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E01C 11/02 E01D 19/06

Claims (3)

(57) [Claims] 1. A rigid mounting plate (13) anchored to an opposing bridge girder (H) and a bridge girder (H) or an abutment, respectively.
And a hard top plate (2) arranged so as to overlap both mounting plates (13) (13) in plan view, and the mounting plate (13) and the top plate (2) overlapping in plan view. An expansion joint for a bridge, comprising elastic shear deformation portions (10) for integrally connecting the respective parts, wherein the shear deformation portion (10) on at least one side has a mounting plate (13) and / or a ceiling. A hard plate (11) serving as a mounting portion to the plate (2) is fixed, and the mounting plate (13) or / and the top plate (2) and the hard plate (11) are joined, and The rigid plate (11) is configured so that the range of movement in the bridge axis direction is regulated by the regulation means (4),
When the amount of approach / separation between the bridge girder (H) and the bridge girder (H) or abutment is larger than the regulated movement of the hard plate (11),
The mounting plate (13) or / and the top plate (2) and the hard plate (11)
An expansion joint for bridges, characterized in that the joint portion with is broken. 2. The mounting plate (13) and / or the top plate (2) and the hard plate (11) are connected by a fastening member (3) or spot welding. Expansion joint for bridge described. 3. The expansion joint for a bridge according to claim 2, wherein at least the hard plate (11), the fastening member (3) and the regulating means (4) are made of steel.