JP3809127B2 - Method for removing laminated rubber body from laminated rubber bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a laminated rubber body in which a rubber plate and a rigid plate are alternately laminated in a plurality of layers, and is a laminated rubber bearing installed between an upper structure and a lower structure of a structure. The present invention relates to a method of removing a laminated rubber body for replacement or the like.
[0002]
[Prior art]
Conventionally, in structures such as bridges and buildings, a bearing is installed between the upper structure and the lower structure in order to reliably transmit the inertial force acting on the upper structure to the lower structure. As the bearing, a laminated rubber bearing including a laminated rubber body in which rubber plates and rigid plates are alternately laminated over a plurality of layers is often used. This laminated rubber bearing functions as a seismic isolation bearing that attenuates the horizontal force during an earthquake by extending the natural period of the structure due to the deformation action of the laminated rubber body, and also distributes the horizontal force during an earthquake to the lower structure. It functions as a horizontal force distributed bearing that transmits the
[0003]
More recently, the laminated rubber bearings installed on bridges are equivalent to the equivalent horizontal seismic intensity of the bearing alone, rather than the Type A bearing used to complement the inertial force equivalent to the equivalent horizontal seismic intensity by complementing the falling bridge prevention system. The type B bearing used when resisting the inertial force corresponding to is often used. In these laminated rubber bearings, in order to maintain the above-described functions, it is necessary to remove and replace the laminated rubber bearing itself or the laminated rubber body when aging or malfunction occurs.
[0004]
The removal / replacement of the laminated rubber bearing has been conventionally performed as shown in FIG. That is, as shown in FIG. 1 which will be described later, as shown in FIG. 4A, the laminated rubber support 1 is installed between the bridge girder 11 which is the upper structure of the bridge 10 and the abutment 12 which is the lower structure. The jacks 30 and 30 are disposed between the bridge girder 11 and the abutment 12, the rod 30a of the jack 30 is extended, and the load of the bridge girder 11 is supported by the jack 30, and FIGS. 4 (a) and 4 (b). As shown in Fig. 4, the upper part 12A 'of the abutment 12 at the lower part of the laminated rubber support 1 is largely suspended, and as shown in Fig. 4 (c), the base plate 6 is dropped into the suspended part and the lower shear key 8 is removed. The laminated rubber support 1 has been removed by removing the lower flange plate 4, the laminated rubber body 2, the upper flange plate 3, the upper shearing key 7, and the sole plate 5.
[0005]
Then, a new laminated rubber bearing (not shown) is installed in place of the removed laminated rubber bearing 1, and the hung portion is restored, and the rod 30a of the jack 30 is degenerated to be newly installed. The laminated rubber support 1 has been replaced by supporting the load of the bridge girder 11 at the support and removing the jacks 30 and 30.
[0006]
[Problems to be solved by the invention]
However, since the conventional method for removing / replacing the laminated rubber bearing described above is a method in which the upper portion 12A ′ of the abutment 12 is largely suspended, it takes cost and time to recover the suspended portion, and the weakness of the abutment 12 There is a danger of promoting the transformation. On the other hand, if the laminated rubber bearing 1 is to be removed / replaced without removing the upper portion 12A ′ of the abutment 12, it is necessary to secure the amount of uplift of the jack 30 until at least the upper shear key 7 and the lower shear key 8 can be removed. However, since the bridge girder 11 may be deformed, it is difficult to ensure the amount of lifting.
[0007]
Here, as shown in JP-A-11-182055, a wire saw is wound around the laminated rubber body 2 of the laminated rubber support 1 to cut the laminated rubber body 2, and the laminated rubber body 2, the upper flange plate 3, and the like. There is also a method of removing the laminated rubber bearing 1 by sequentially removing the upper shear key 7, the sole plate 5, the lower flange plate 4, the lower shear key 8, and the base plate 6, but generally the removal of the laminated rubber bearing is narrow. This is not an effective method because it is often performed in a large space.
[0008]
The present invention has been made based on such a background. The object of the present invention is to prevent the structure from being deformed and to be constructed even in a narrow space, and to reduce costs by reducing work. It is an object of the present invention to provide a method of removing a laminated rubber body from a laminated rubber support that can shorten the time.
[0009]
[Means for Solving the Problems]
The present invention adopts the following means in order to solve the above problems. In addition, although the code | symbol in drawing is attached for reference, this invention is not limited by this drawing.
[0010]
The invention according to claim 1 includes a laminated rubber body 2 in which rubber plates 2a and rigid plates 2b are alternately laminated over a plurality of layers, and includes an upper structure (bridge girder 11) and a lower structure of a structure (bridge 10). In the laminated rubber bearing 1 installed between (the abutment 12), a support member (jack 30) is disposed between the upper structure and the lower structure, and the load of the upper structure is supported by the support member. 1 step, a second step of removing a part of the laminated rubber body by forming a horizontal perforation (40) in the laminated rubber body, and a third step of removing the remainder of the laminated rubber body, It is the removal method of the laminated rubber body in the laminated rubber support characterized by comprising. According to this, when the load of the upper structure is supported by the support member, the amount of the upper structure is small, so that the structure does not need to be deformed. In addition, since there is no work of winding a wire saw around the laminated rubber body, construction can be performed even in a narrow space. Further, when replacing the laminated rubber bearing, since the lower structure needs less lifting and restoration work, the cost can be reduced and the time can be shortened by reducing the work.
[0011]
The invention according to claim 2 is the method for removing the laminated rubber body 2 in the laminated rubber support 1 according to claim 1, wherein in the second step, the horizontal perforations 40 are wrapped in the laminated rubber body. , 40... Is a method for removing a laminated rubber body in a laminated rubber bearing, wherein a part of the laminated rubber body is removed. According to this, since a large space is formed in the laminated rubber body by the horizontal perforations wrapped with each other, the laminated rubber body can be easily removed.
[0012]
Further, the invention according to claim 3 is the method for removing the laminated rubber body 2 from the laminated rubber support 1 according to claim 1 or 2, wherein the drilling 40 is formed using the core drill 20 in the second step. A method for removing a laminated rubber body from a laminated rubber bearing. According to this, since the laminated rubber body of the portion where the perforations are formed can be obtained as a sample, the physical properties of the laminated rubber body can be investigated.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is a method for removing a laminated rubber body in a laminated rubber support installed between an upper structure and a lower structure of a structure. In the following, as shown in FIG. 1, the structure is a bridge 10, the upper structure is a concrete bridge girder 11, the lower structure is a concrete abutment 12, and as shown in FIG. An example in which the laminated rubber body 2 is removed from the support 1 with the core drill 20 will be described.
[0014]
First, FIG. 1 is a view showing an example of a laminated rubber bearing 1 installed on a bridge 10, wherein (a) is a front view and (b) is a side view. The laminated rubber bearing 1 includes a laminated rubber body 2, an upper flange plate 3, a lower flange plate 4, a sole plate 5, a base plate 6, an upper shear key 7, a lower shear key 8, a side block 9, and the like. 11 and the abutment 12, and functions as the seismic isolation bearing and the horizontal force dispersion bearing by the deformation action of the laminated rubber body 2.
[0015]
The laminated rubber body 2 is formed by alternately laminating rubber plates 2a and rigid plates 2b over a plurality of layers. Specifically, a rectangular rubber plate 2a and a rectangular rigid plate 2b are vulcanized and bonded. It is of shape. Here, the material of the rubber plate 2a is, for example, a rubber elastic body, and the material of the rigid plate 2b is, for example, steel. In addition, a covering rubber (not shown) is wound around the laminated rubber body 2 in order to prevent deterioration of the rubber plate 2a and the rigid plate 2b. In the laminated rubber body 2, an upper flange plate 3 that is a steel plate is fixed to the upper surface thereof, and a lower flange plate 4 that is a steel plate is fixed to the lower surface thereof.
[0016]
On the other hand, the sole plate 5 is attached to the lower surface of the bridge girder 11 by an appropriate number of anchor bars 5a, and the base plate 6 is attached to the upper surface of the abutment 12 by an appropriate number of anchor bolts 6a. At the center of the upper surface of the laminated rubber body 2, the upper flange plate 3, and the lower surface of the sole plate 5, a hole for inserting the upper shear key 7 for transmitting an inertial force is formed. A hole for inserting a lower shear key 8 for transmitting an inertial force is formed at the center of each of the lower surface of 2, the lower flange plate 4, and the upper surface of the base plate 6.
[0017]
Then, with the base plate 6 attached to the abutment 12, the lower shear key 8 is inserted into a hole formed in the base plate 6, and the lower shear key 8 is a hole formed in the laminated rubber body 2 and the lower flange plate 4. The laminated rubber body 2 to which the upper flange plate 3 and the lower flange plate 4 are fixed is set so that the lower flange plate 4 and the base plate 6 are screwed together with an appropriate number of mounting bolts 4a. A bridge girder to which the sole plate 5 is attached so that the upper shear key 7 is inserted into the hole formed in the body 2 and the upper flange plate 3, and the upper shear key 7 is inserted into the hole formed in the sole plate 5. 11 is set, and the upper flange plate 3 and the sole plate 5 are screwed together by an appropriate number of mounting bolts 3a. Laminated rubber bearing 1 during the abutment 12 is installed with.
[0018]
Next, FIG. 2 is a side view showing an example of the core drill 20. The core drill 20 includes a base 21 attached to the front surface of the abutment 12, a column 22 erected from the base 21, a bracket 23 that can advance and retreat along the column 22, and a core bit 24 that hangs down from the bracket 23. Further, the laminated rubber body 2 in the laminated rubber support 1 is a portable type in which the laminated rubber body 2 is removed by forming perforations 40 described later.
[0019]
Here, the bracket 23 is provided with a motor 23 a that rotates the core bit 24. The core bit 24 includes a cylindrical bit 24c for cutting the laminated rubber body 2, a cylindrical tube 24b for housing the cut laminated rubber body 2, and a motor 23a from the tip side (lower side in FIG. 2). An adapter 24a is provided as a connecting portion. A cutting edge of a material and a shape suitable for cutting the rubber plate 2a and the rigid plate 2b constituting the laminated rubber body 2 is formed at the tip of the bit 24c. The cutting edge may be a diamond bit corresponding to cutting of concrete and reinforcing bars, or a carbide tip bit corresponding to cutting of an iron plate and a steel frame. The tube 24b has a length longer than the diameter of the laminated rubber body 2 to be cut, and the tube 24b has a diameter shorter than the height of the laminated rubber body 2 to be cut. It is comprised so that the perforation 40 penetrated in the horizontal direction inside the body 2 can be formed.
[0020]
Next, FIG. 3 is a figure showing an example of the removal method of the lamination | stacking rubber body 2 in the lamination | stacking rubber support 1 based on this invention, (a) is a front view, (b) is a side view, (c) is (b). FIG. The removal / replacement of the laminated rubber bearing 1 according to the present invention is performed as shown in FIG. That is, as shown in FIG. 1, the laminated rubber support 1 is installed between the bridge girder 11 which is the upper structure of the bridge 10 and the abutment 12 which is the lower structure, as shown in FIG. The core drill 20 is set in front of the abutment 12. Specifically, the base 21 is attached to the front surface of the abutment 12 with anchor bolts (not shown) so that the tip of the core bit 24 faces the right end of the laminated rubber body 2.
[0021]
Next, as shown in FIG. 3 (a), jacks 30, 30 as support members are arranged between the bridge girder 11 and the abutment 12, and the rod 30 a of the jack 30 is extended to Support the load. Next, while operating the motor 23a to rotate the core bit 24 of the core drill 20 at an appropriate speed, the bracket 23 is advanced along the column 22 and the core bit 24 forms a horizontal perforation 40 in the laminated rubber body 2, When the core bit 24 penetrates the laminated rubber body 2, the bracket 23 is retracted along the column 22 to remove a part of the laminated rubber body 2. By forming the perforations 40 using the core drill 20 in this way, the laminated rubber body 2 in the portion where the perforations 40 are formed can be obtained as a sample, so that the physical properties of the laminated rubber body 2 can be investigated. The “horizontal direction” may be a substantially horizontal direction, and is a concept including a slight downward direction and upward direction.
[0022]
Next, the core drill 20 is replaced, and the core drill 20 is set at a position where the drill 40 that is wrapped (partially overlapped) with the drill 40 formed as described above is formed, and the drill 40 is formed. This operation is repeated from any end of the laminated rubber body 2 to the other end, and a large space is formed in the laminated rubber body 2 by forming horizontal perforations 40, 40. Therefore, the removal of the laminated rubber body 2 is facilitated.
[0023]
Then, as shown in FIG. 3 (c), using the space formed as described above, the remaining laminated rubber body 2 'and the lower flange plate 4 are removed, and the lower shear key 8 is removed, and the base plate 6 and the remaining portion are removed. The laminated rubber support 1 is removed by sequentially removing the laminated rubber body 2 ', the upper flange plate 3, the upper shearing key 7, and the sole plate 5.
[0024]
Thereafter, the upper part 12A of the abutment 12 is suspended as necessary, a new laminated rubber bearing (not shown) is installed instead of the laminated rubber bearing 1 removed as described above, and the suspended part is restored. The laminated rubber support 1 is exchanged by supporting the load of the bridge girder 11 with a newly installed laminated rubber support by retracting the rod 30a of the jack 30 and removing the jacks 30,30.
[0025]
According to the present invention described above, when the load of the bridge girder 11 is supported by the jack 30, the amount of lifting of the bridge girder 11 is small, so that the bridge 10 need not be deformed. Further, since there is no work of winding a wire saw around the laminated rubber body 2, it can be constructed even in a narrow space. Further, when the laminated rubber support 1 is replaced, the abutment 12 needs only to be lifted and restored, so that the cost can be reduced and the time can be reduced by reducing the work.
[0026]
Finally, a modification of the present invention will be described.
[0027]
In the above-described embodiment, an example in which the structure is the bridge 10, the upper structure is the bridge girder 11, and the lower structure is the abutment 12 has been described. Is applicable.
[0028]
In the above embodiment, an example in which the laminated rubber body 2 includes only the rubber plate 2a and the rigid plate 2b has been described. However, the present invention is not limited to this, and the laminated rubber body includes a lead plug in the vertical direction. It may be of a type that attenuates the horizontal force during an earthquake by deformation.
[0029]
In the above embodiment, an example in which the laminated rubber support 1 includes the upper shear key 7 and the lower shear key 8 has been described. However, the present invention is not limited to this, and the laminated rubber support may be of a type that does not include these shear keys. In this case, only the laminated rubber body 2 can be replaced without removing the upper portion 12A of the abutment 12.
[0030]
In the above embodiment, the example in which the core bit 24 of the core drill 20 is configured by the three parts of the adapter 24a, the tube 24b, and the bit 24c has been described. For example, the number of components of the core bit 24 may be one or two.
[0031]
In the above embodiment, the example in which the horizontal perforations 40 are formed in the bridge axis direction has been described. However, the present invention is not limited thereto, and the perforations may be formed in the direction orthogonal to the bridge axis. That is, the direction in which the perforations are formed may be appropriately determined according to the situation of the work space.
[0032]
In the above-described embodiment, an example in which the horizontal perforations 40 are formed by wrapping each other has been described. However, the present invention is not limited to this. Instead, it may be formed intermittently. That is, the perforations may be formed in a form that allows the remaining laminated rubber body 2 'to be removed thereafter.
[0033]
In the above-described embodiment, an example in which the anchor bolt (not shown) is removed from the base 21 of the core drill 20 each time the setup change of the core drill 20 is performed has been described. A slide rail may be attached to the front surface of the core 12 so that the base 21 of the core drill 20 slides and moves laterally on the slide rail. According to this configuration, the core drill 20 can be easily replaced.
[0034]
【The invention's effect】
According to the method for removing a laminated rubber body in the laminated rubber support according to the present invention, the structure can be constructed even in a narrow space without causing deformation, and the cost can be reduced and the time can be reduced by reducing work. There is a remarkable effect of being able to.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a laminated rubber bearing installed on a bridge, where (a) is a front view and (b) is a side view.
FIG. 2 is a side view showing an example of a core drill.
FIG. 3 is a view showing an example of a method for removing a laminated rubber body in a laminated rubber support according to the present invention, wherein (a) is a front view, (b) is a side view, and (c) is (b). FIG.
FIGS. 4A and 4B are diagrams showing an example of a conventional method for removing a laminated rubber bearing, in which FIG. 4A is a front view, FIG. 4B is a side view, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Laminated rubber support 2 ... Laminated rubber body 2a ... Rubber plate 2b ... Rigid plate 3 ... Upper flange plate 3a ... Mounting bolt 4 ... Lower flange plate 4a ... Mounting bolt 5 ... Sole plate 5a ... Anchor bar 6 ... Base plate 6a ... Anchor Bolt 7 ... Up shear key 8 ... Down shear key 9 ... Side block 10 ... Bridge 11 ... Bridge girder 12 ... Abutment 12A ... Upper portion 20 ... Core drill 21 ... Base 22 ... Column 23 ... Bracket 23a ... Motor 24 ... Core bit 24a ... Adapter 24b ... Tube 24c ... bit 30 ... jack 30a ... rod 40 ... perforated

Claims (3)

In a laminated rubber bearing provided with a laminated rubber body in which rubber plates and rigid plates are alternately laminated over a plurality of layers, and installed between the upper structure and the lower structure of the structure,
A first step of disposing a support member between the upper structure and the lower structure, and supporting a load of the upper structure by the support member;
A second step of removing a part of the laminated rubber body by forming a horizontal perforation in the laminated rubber body;
A third step of removing the remainder of the laminated rubber body;
A method for removing a laminated rubber body from a laminated rubber bearing, comprising: A method for removing a laminated rubber body in a laminated rubber bearing according to claim 1,
A method for removing a laminated rubber body in a laminated rubber bearing, wherein in the second step, a part of the laminated rubber body is removed by forming a horizontal perforation wrapped around the laminated rubber body. A method for removing a laminated rubber body in a laminated rubber bearing according to claim 1 or 2,
In the second step, the perforations are formed using a core drill, and the method for removing a laminated rubber body in a laminated rubber support.

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