Seismic isolation expansion joint

Abstract

This invention provides a seismic isolation expansion joint that allows the connecting plate to vibrate smoothly above the non-seismic isolation section during an earthquake, and that makes it easier to maintain the appearance quality of the upper part of the non-seismic isolation section after the earthquake. [Solution] The seismic isolation expansion joint 10 covers the gap 13 of the seismic isolation clearance provided between the seismic isolation structure 11 and the non-seismic isolation structure 12. The base end of the bridge plate 20 is connected to the seismic isolation structure 11 to cover the gap 13, and the tip end is positioned on the upper part of the non-seismic isolation structure 12. The bridge plate 20 has a downward-facing sliding projection 21 at a position vertically opposite to the upper part of the non-seismic isolation structure 12, and a sliding surface 22 provided on the upper part of the non-seismic isolation structure 12 that the sliding projection 21 contacts and slides against. The bridge plate 20 covers the sliding surface 22 and the upper surface 12a of the non-seismic isolation structure 12 which is spaced further away from the gap 13 than the sliding surface 22.

Description

[Technical Field]

[0001] This invention relates to a seismic isolation expansion joint. [Background technology]

[0002] A seismic isolation expansion joint covers the gap in the seismic isolation clearance between the seismically isolated and non-seismic-isolated sections, allowing people and vehicles to pass through. When a major earthquake occurs, the relative position of the seismically isolated and non-seismic-isolated sections changes significantly in the horizontal direction. The seismic isolation expansion joint covers the gap between the seismically isolated and non-seismic-isolated sections, following this change in relative position.

[0003] Patent Document 1 describes a seismic isolation expansion joint that covers the gap between the structural frames of a seismically isolated building and a non-seismic-isolated building. Non-Patent Document 1 describes an expansion joint made of cast iron. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2014-202008 [Non-patent literature]

[0005] [Non-Patent Document 1] Taisei Corporation, "Development of Cast Iron Seismic Isolation Expansion Joint 'TH-SLIDER'", April 1, 2020, [Retrieved December 20, 2024], Internet<https: / / www.taisei.co.jp / about_us / wn / 2020 / 200401_4907.html> [Overview of the project] [Problems that the invention aims to solve]

[0006] The conventional seismic isolation expansion joint described in Patent Document 1 is a flip-up type that eliminates steps around the building. However, residual deformation after a major earthquake was a problem with the flip-up type seismic isolation expansion joint. Therefore, Non-Patent Document 1 proposed a cast iron sliding seismic isolation expansion joint. In this structure, a cast iron connecting plate was fitted into the seismically isolated building side and placed on the concrete of the non-seismic isolation section so that it could slide.

[0007] When a cast iron gangway slides on concrete, the carbon contained in the cast iron precipitates as graphite and acts as a lubricant, reducing the coefficient of friction. However, because cast iron is harder than concrete, sliding on concrete causes damage to the concrete surface of non-seismic-isolated sections. As a result, the coefficient of friction increases, making it more difficult to slide, and the cast iron gangway becomes less likely to swing laterally on non-seismic-isolated sections. Moreover, the damage to the concrete surface of non-seismic-isolated sections leads to a problem of reduced appearance quality after an earthquake.

[0008] Therefore, the present invention has been made in view of the above circumstances, and aims to provide a seismic isolation expansion joint that allows the connecting plate to swing smoothly over the non-seismic isolation section during an earthquake, and maintains the appearance quality of the non-seismic isolation section after the earthquake. [Means for solving the problem]

[0009] The seismic isolation expansion joint of the present invention, which solves the above problems, is a seismic isolation expansion joint that covers the gap of a seismic isolation clearance provided between a seismic isolation structure and a non-seismic isolation structure, comprising: a bridge plate whose base end is connected to the seismic isolation structure and covers the gap, and whose tip end is positioned on the upper part of the non-seismic isolation structure; a sliding projection provided downward on the bridge plate at a position vertically opposite to the upper part of the non-seismic isolation structure; and a sliding surface provided on the upper part of the non-seismic isolation structure upon which the sliding projection abuts and slides, wherein the bridge plate covers the sliding surface and the upper surface of the non-seismic isolation structure that is spaced further from the gap than the sliding surface.

[0010] According to the present invention, a sliding projection is provided facing downward at a position that is vertically opposite to the non-seismic isolation structure of the gangway plate, and this sliding projection is configured to abut and slide against the sliding surface of the non-seismic isolation structure. Therefore, even if the gangway plate vibrates during an earthquake, the sliding projection slides on the sliding surface of the non-seismic isolation structure, preventing the gangway plate from contacting and rubbing against the upper surface of the non-seismic isolation structure. Furthermore, because the gangway plate is supported by the sliding projection and does not come into contact with the upper surface of the non-seismic isolation structure, the surface of the non-seismic isolation structure will not be scraped by the gangway plate even if it vibrates during an earthquake. As a result, the gangway plate can swing smoothly on the non-seismic isolation structure. Furthermore, because the sliding surface and the upper surface of the non-seismic isolation structure located further away from the gap than the sliding surface are covered by the gangway plate, the sliding surface is not visible from the outside of the gangway plate. Therefore, the appearance quality of the upper part of the non-seismic isolation structure after an earthquake can be ensured. Therefore, the seismic isolation expansion joint of the present invention allows the connecting plate to swing smoothly over the non-seismic isolation section during an earthquake, and ensures the appearance quality of the upper part of the non-seismic isolation section after the earthquake.

[0011] In the present invention, the connecting plate has a rigid plate material that is vertically swingable and connected to the seismic isolation structure, and the sliding projection may be provided on the rigid plate material. This design makes it easier to maintain the vertical position of the rigid plate material even when vertical force is applied to the seismic isolation structure. As a result, the sliding projection is more likely to maintain contact with the sliding surface, allowing it to slide reliably on the sliding surface. Moreover, since only the load of the connecting plate is applied to the sliding projection, and the load from the seismic isolation structure is less likely to be transmitted to the sliding projection, it is possible to make it easier for the sliding projection to slide on the sliding surface.

[0012] In the present invention, a slope that slopes downward toward the upper surface of the non-seismic isolation structure may be formed on the tip side of the connecting plate. In this way, a large step is unlikely to form between the upper surface of the non-seismic isolation structure and the upper surface of the gangway, and movement between the upper surface of the non-seismic isolation structure and the upper surface of the gangway is easy.

[0013] In the present invention, the sliding surface may be formed of a high-strength plate material having a higher compressive strength than the bridging plate, and the high-strength plate material may be installed above the non-seismic structure portion. By doing so, even if the weight of the bridging plate is locally loaded on the non-seismic structure portion by the sliding protrusion and slides, it is possible to prevent the sliding surface from being damaged. Therefore, the degree of freedom in the material quality and the like of the surface of the non-seismic structure portion can be ensured.

[0014] In the present invention, the sliding surface may be a polished surface polished smoother than the upper surface of the non-seismic structure portion. By doing so, it is possible to make the sliding protrusion slide more easily on the sliding surface, reduce the wear between the sliding surface and the sliding protrusion, and improve the durability of the seismic expansion joint.

[0015] In the present invention, the sliding protrusion may be a material having a Young's modulus lower than that of the constituent material of the sliding surface. In that case, the ratio (Ea / Eb) between the Young's modulus (Ea) of the sliding protrusion and the Young's modulus (Eb) of the constituent material of the sliding surface may be 1 / 100 or less. Thereby, when the sliding protrusion slides on the sliding surface, it is possible to prevent the wear of the sliding surface due to the wear of the sliding protrusion, and improve the durability of the seismic expansion joint.

[0016] In the present invention, the sliding surface may be provided at a position lower than the upper surface of the non-seismic structure portion covered on the tip side of the bridging plate. By doing so, it becomes easier to reduce the gap between the back surface on the tip side of the bridging plate and the upper surface of the non-seismic structure portion, and it can be arranged without forming a step between the tip side of the bridging plate and the upper surface of the non-seismic structure portion.

Advantages of the Invention

[0017] According to the seismic expansion joint of the present invention, the bridging plate can easily slide smoothly above the non-seismic portion during an earthquake, and the appearance quality above the non-seismic portion can be ensured after the earthquake.

Brief Description of the Drawings

[0018] [Figure 1] (a) is a schematic plan view showing a structure that covers the gap between a seismic isolation structure and a non-seismic isolation structure using a seismic isolation expansion joint according to the first embodiment of the present invention, and (b) is a schematic longitudinal cross-sectional view showing its longitudinal section. [Figure 2] This is a longitudinal cross-sectional view of a seismic isolation expansion joint according to the first embodiment of the present invention. [Figure 3] This is an enlarged longitudinal cross-sectional view of the sliding projection of a seismic isolation expansion joint according to the first embodiment of the present invention. [Figure 4] This is an enlarged longitudinal cross-sectional view of the sliding projection of a seismic isolation expansion joint according to the first embodiment of the present invention. [Figure 5] This is a longitudinal cross-sectional view of a seismic isolation expansion joint according to a second embodiment of the present invention. [Figure 6] This graph shows the relationship between surface pressure and friction coefficient in the examples. [Modes for carrying out the invention]

[0019] Embodiments of the present invention will be described in detail below with reference to the figures. Figure 1(a) is a schematic plan view showing the structure that covers the gap between the seismic isolation structure and the non-seismic isolation structure using the seismic isolation expansion joint of this embodiment, (b) is a schematic longitudinal section view showing its longitudinal section, and Figure 2 is a longitudinal cross-sectional view of the seismic isolation expansion joint of this embodiment.

[0020] As shown in Figures 1(a) and 1(b), the seismic isolation expansion joint 10 of this embodiment is a structure that covers the gap 13 of the seismic isolation clearance provided between the seismic isolation structure 11 and the non-seismic isolation structure 12 from above. In this embodiment, the seismic isolation structure 11 is, for example, a seismic isolation structure such as a seismic isolation building, and the non-seismic isolation structure is, for example, a road surface that people and vehicles can pass over, or a structure with a road surface on top.

[0021] The seismic isolation structure 11 is constructed in a seismic isolation pit 14 provided on the non-seismic isolation structure 12 side via a seismic isolation device 15, and the seismic isolation device 15 suppresses earthquake vibrations. During an earthquake, the non-seismic isolation structure 12 and the seismic isolation structure 11 vibrate relatively in a substantially horizontal direction, so a seismic isolation clearance gap 13 is provided between the seismic isolation structure 11 and the surrounding non-seismic isolation structure 12. The seismic isolation expansion joint 10 in this embodiment is installed so as to close the seismic isolation clearance gap 13 between the seismic isolation pit 14 and the seismic isolation structure 11 from above.

[0022] The seismic isolation expansion joint 10 comprises a connecting plate 20 that covers the gap 13 of the seismic isolation clearance, a sliding projection 21 provided facing downward on the back surface of the connecting plate 20, and a sliding surface 22 provided on the upper part of the non-seismic isolation structure 12, which the sliding projection 21 contacts and slides against.

[0023] The gangway plate 20 is connected to the seismic isolation structure 11 and has a size that continuously covers the gap 13 of the seismic isolation clearance and the portion adjacent to the gap 13 at the top of the non-seismic isolation structure 12. The gangway plate 20 has a rigid plate material 20a connected to the seismic isolation structure 11. The gangway plate 20 in this embodiment is composed almost entirely of rigid plate material 20a.

[0024] The rigid plate material 20a is made of concrete, such as an RC board. A concrete rigid plate material 20a can be manufactured inexpensively. In particular, using an RC board is preferable because it makes it easier to ensure sufficient strength. The rigid plate material 20a in this embodiment has a compressive strength of 18-24 N / mm². 2 It is formed from RC panels.

[0025] In this gangway 20, a rigid plate material 20a is connected to the seismic isolation structure 11 at its base end by a pin structure 23, and the tip end is configured to swing up and down with the pin as a pivot point. The gangway 20 is supported on the sliding surface 22 of the non-seismic isolation structure 12 via a sliding projection 21. The slope of the upper surface of the gangway 20 is maintained at, for example, 1 / 100. In addition, a slope 20b is formed on the tip end of the gangway 20 so as to slope downward towards the upper surface 12a of the non-seismic isolation structure 12.

[0026] Figure 3 is an enlarged longitudinal cross-sectional view of the sliding projection 21. As shown in Figure 3, the sliding projection 21 is provided so as to protrude downward from the back surface of the rigid plate material 20a of the connecting plate 20, specifically at a position on the rigid plate material 20a that is vertically opposite to the upper part of the non-seismic isolation structure 12. The sliding projection 21 in this embodiment is formed from a material such as fluororesin (a general term for plastic raw materials containing fluorine atoms), poloamide (a general term for linear polymers in which monomers are linked by amide bonds), or polyacetal resin (POM resin), and is fixed to the surface of the thin steel plate 21a. By fixing the thin steel plate 21a to the back surface of the rigid plate material 20a, the sliding projection 21 is installed on the back surface of the rigid plate material 20a via the thin steel plate 21a.

[0027] The shape of the sliding projection 21 is not particularly limited as long as it is a shape that can support the load applied from the bridge plate 20 and slide on the sliding surface 22. In this embodiment, the sliding projection 21 is formed in a cylindrical shape, and the contact surface 21b that abuts against the sliding surface 22 of the non-seismic isolation structure 12 has a circular planar shape, and the outer edge of the contact surface 21b is rounded. Multiple sliding projections 21 are attached to the back surface of the bridge plate 20.

[0028] Since the sliding projection 21 abuts against the sliding surface 22 and is subjected to a load from the gangway plate 20, it is preferable that its compressive strength be five times or more the design surface pressure. If the compressive strength of the sliding projection 21 is equal to or greater than the predetermined strength, the sliding projection 21 can support the gangway plate 20 without being damaged even when sliding while in contact with the sliding surface 22 of the non-seismic isolation structure 12.

[0029] Furthermore, since the sliding projection 21 slides in contact with the sliding surface 22, it is preferable that it has a Young's modulus lower than that of the constituent material of the sliding surface 22. In this embodiment, the Young's modulus of the sliding projection 21 is 400 N / mm². 2 It is composed of the following materials. If the Young's modulus is smaller than a predetermined value, the sliding surface 22 can perform the desired sliding motion without being damaged.

[0030] One or more sliding projections 21 can be provided on a single connecting plate 20. The surface pressure at which the contact surface 21b of the sliding projection 21 contacts the sliding surface 22 due to the load applied from the connecting plate 20 is 5 N / mm². 2 The structure may be configured as described above. With such surface pressure, the coefficient of friction with respect to the sliding surface 22 of the non-seismic isolation structure 12 can be kept low, damage to the sliding surface 22 can be prevented, and the number of sliding protrusions 21 to be installed can be kept to a minimum. In this embodiment, the contact pressure of the contact surface 21b of one sliding projection 21 is 5 to 10 N / mm 2 The size, number, and spacing of the sliding protrusions 21 are set accordingly.

[0031] The sliding surface 22 is the surface upon which the sliding projection 21 abuts and slides, and consists of a polished surface that is smoother than the upper surface 12a of the non-seismic isolation structure 12. The sliding surface 22 is provided substantially horizontally on the upper part of the non-seismic isolation structure 12. Preferably, the sliding surface 22 is a surface polished with an abrasive of #400 or higher on the surface of the high-strength plate material 22a, with a smoothness of 1 / 500 or less and a flatness of 1 mm or less. Within this range, the sliding projection 21, with the load of the bridge plate 20 applied, can slide smoothly in contact with the surface. The compressive strength of the sliding surface 22 is, for example, (design surface pressure of the sliding projection 10 N / mm²). 2 (If so) 34 N / mm 2 (Note: The required compressive strength is calculated as the design surface pressure of the sliding projection × 3 / 0.9: for example, a design surface pressure of 10 N / mm²) 2 In that case, 34 N / mm 2 ) is preferable.

[0032] As shown in Figure 3, the sliding surface 22 in this embodiment is formed on the surface of a high-strength plate material 22a, which has a higher compressive strength than the bridge plate 20. The sliding surface 22 is provided on the upper part of the non-seismic isolation structure 12 by installing the high-strength plate material 22a on the upper part of the non-seismic isolation structure 12. The high-strength plate material 22a is, for example, a high-strength concrete plate such as an HPC plate. An HPC plate is preferable because it can be manufactured at low cost and it is easy to ensure sufficient strength.

[0033] The high-strength plate 22a has a compressive strength of 100 N / mm 2 or more, or a Young's modulus of 40,000 N / mm 2 or more. If the compressive strength is above a predetermined value, when the sliding projection 21 slides under the load from the bridging plate 20 via the sliding projection 21, damage to the high-strength plate 22a can be prevented. Also, if the Young's modulus is above a predetermined value, when the sliding projection 21 slides on the sliding surface 22, damage to the sliding surface can be prevented.

[0034] In this embodiment, the ratio Ea / Eb of the Young's modulus (Ea) of the sliding projection 21 to the Young's modulus (Eb) of the high-strength plate 22a forming the sliding surface 22 is formed to be 1 / 100 or less. Within this range, when the sliding projection 21 slides on the sliding surface 22, it is easier to prevent damage to the sliding surface 22 by wearing out the sliding projection 21.

[0035] The high-strength plate 22a is fixedly arranged at a position adjacent to the gap 13 of the seismic isolation clearance above the non-seismic structure part 12. In this embodiment, the position adjacent to the gap 13 of the non-seismic structure part 12 is formed in a stepped shape, and the high-strength plate 22a is fixedly arranged in the arranged part 12b recessed from the upper surface 12a.

[0036] Furthermore, in the state where the high-strength plate 22a is arranged in the arranged part 12b, the sliding surface 22 is arranged at a position lower than the upper surface 12a of the non-seismic structure part 12. The height difference between the upper surface 12a of the non-seismic structure part 12 and the sliding surface 22 is formed smaller than the protruding amount of the contact surface 21b of the sliding projection 21 from the bridging plate 20.

[0037] In this embodiment, the sliding surface 22 is provided on the entire upper surface of the high-strength plate 22a. This sliding surface 22 is formed wider than the width of the gap 13 of the seismic isolation clearance, preferably twice or more wider. This is to prevent the sliding projection 21 from coming off the sliding surface 22 even when it vibrates maximally with respect to the sliding surface 22 during an earthquake. Furthermore, the sliding surface 22 is completely covered in a plan view by the gangway plate 20. The gangway plate 20, along with the gap 13, covers the sliding surface 22 and covers the upper surface 12a of the non-seismic isolation structure 12 at its tip.

[0038] Next, we will explain the operation of such a seismic isolation expansion joint 10 during an earthquake. Figures 4(a) to 4(c) are longitudinal cross-sectional views illustrating the operation of the seismic isolation expansion joint 10.

[0039] First, under normal conditions, as shown in Figure 4(a), the seismic isolation expansion joint 10 is installed in a state where it spans between the seismic isolation structure 11 constructed on the seismic isolation pit 14 and the non-seismic isolation structure 12 surrounding the seismic isolation pit 14. At this time, the sliding projection 21 that protrudes downward from the gangway plate 20 abuts against the middle position in the width direction of the sliding surface 22 of the high-strength plate material 22a, and the load on the gangway plate 20 and the load applied to the gangway plate 20 are stably supported by the sliding surface 22 via the sliding projection 21.

[0040] The gangway plate 20 covers the gap 13 of the seismic isolation clearance and the sliding surface 22, and also covers the flat upper surface 12a adjacent to the sliding surface 22 of the non-seismic isolation structure 12, while maintaining a certain distance. In addition, the slope 20b at the tip of the gangway plate 20 is positioned close to the flat upper surface 12a of the non-seismic isolation structure 12, while maintaining a certain distance.

[0041] During an earthquake, the seismic isolation structure 11 is isolated by the seismic isolation device 15 within the seismic isolation pit 14, while the non-seismic isolation structure 12 surrounding the seismic isolation pit 14 vibrates. As a result, the seismic isolation structure 11 and the non-seismic isolation structure 12 vibrate relative to each other, as shown in Figures 4(b) and 4(c). This causes the sliding projection 21 protruding from the gangway plate 20 to slide on the sliding surface 22 of the high-strength plate material 22a. Since the gangway plate 20 is pivotably connected to the seismic isolation structure 11, it can slide while in contact with the sliding surface 22.

[0042] In this embodiment, since the sliding surface 22 is formed to be more than twice as wide as the width of the gap 13 in the seismic isolation clearance, the sliding projection 21 that was in contact with the intermediate position of the sliding surface 22 can slide without coming off the sliding surface 22 even when the sliding surface 22 vibrates to its maximum extent, and the bridge plate 20 does not bounce up. As a result, the load from the bridge plate 20 can vibrate while being stably supported on the sliding surface 22 via the sliding projection 21.

[0043] Furthermore, since the connecting plate 20 is supported by the sliding projection 21, it vibrates while separated from the upper surface 12a of the non-seismic isolation structure 12. Therefore, no damage occurs to the upper surface 12a of the non-seismic isolation structure 12. Even when the seismic isolation structure 11 and the non-seismic isolation structure 12 vibrate to their maximum relative extent, the connecting plate 20 constantly covers the gap 13 of the seismic isolation clearance and the sliding surface 22, while also maintaining a state of constantly covering the flat upper surface 12a adjacent to the sliding surface 22 of the non-seismic isolation structure 12 at a distance. The slope 20b at the tip of the connecting plate 20 is also constantly positioned in close proximity to the flat upper surface 12a of the non-seismic isolation structure 12.

[0044] After the earthquake, the structure returns to its normal state as shown in Figure 4(a), with the sliding surface 22 where the sliding projection 21 slid being covered by the connecting plate 20, and no damage to the upper surface 12a of the non-seismic isolation structure 12 during the vibration. Therefore, the appearance quality around the seismic isolation expansion joint 10 can be maintained at the same level as before the earthquake.

[0045] According to the seismic isolation expansion joint 10 described above, a sliding projection 21 is provided facing downward at a position that is vertically opposite to the non-seismic isolation structural part 12 of the connecting plate 20, and this sliding projection is configured to contact and slide against the sliding surface 22 of the non-seismic isolation structural part 12. Therefore, even if the gangway plate 20 vibrates during an earthquake, the sliding projection slides on the sliding surface 22 of the non-seismic isolation structure 12, preventing the gangway plate 20 from contacting and rubbing against the upper surface 12a of the non-seismic isolation structure 12. Furthermore, because the gangway plate 20 is supported by the sliding projection and does not come into contact with the upper surface 12a of the non-seismic isolation structure 12, the surface of the non-seismic isolation structure 12 is not scraped by the gangway plate 20 even when it vibrates during an earthquake. As a result, the gangway plate 20 can vibrate smoothly on the non-seismic isolation structure 12.

[0046] Furthermore, because the gangway plate 20 covers both the sliding surface 22 and the upper surface 12a of the non-seismic isolation structure 12 located further away from the gap 13 than the sliding surface 22, the sliding surface 22 is not visible from the outside of the gangway plate 20. Therefore, the appearance quality of the upper part of the non-seismic isolation structure 12 after an earthquake can be ensured.

[0047] In the seismic isolation expansion joint 10 of this embodiment, the connecting plate 20 has a rigid plate material 20a that is pin-connected to the seismic isolation structure 11 and is connected so as to be able to swing up and down, and a sliding projection 21 is provided on the rigid plate material 20a. As a result, the sliding projection 21 can move freely up and down due to the swinging of the rigid plate material 20a and slide while always in contact with the sliding surface 22, and moreover, only the load of the connecting plate 20 is applied to the sliding projection 21 and the load from the seismic isolation structure 11 is not easily transmitted to the sliding projection 21, so the sliding projection 21 slides easily on the sliding surface 22.

[0048] Furthermore, in this seismic isolation expansion joint 10, a slope 20b is provided on the tip side of the connecting plate 20, sloping downwards toward the upper surface 12a of the non-seismic isolation structure 12. Therefore, a large step is unlikely to form between the upper surface 12a of the non-seismic isolation structure 12 and the upper surface 20c of the connecting plate 20, and movement between the upper surface 12a of the non-seismic isolation structure 12 and the upper surface 20c of the connecting plate 20 is easy.

[0049] Furthermore, in this seismic isolation expansion joint 10, the sliding surface 22 is formed on the surface of a high-strength plate material 22a, which has a higher compressive strength than the gangway plate 20, and the high-strength plate material 22a is installed on the upper part of the non-seismic isolation structure 12. Therefore, even if the weight of the gangway plate 20 is locally loaded onto the non-seismic isolation structure 12 by the sliding projection 21 and causes it to slide, damage to the sliding surface 22 can be prevented. This ensures freedom in the material and other aspects of the surface of the non-seismic isolation structure 12.

[0050] Furthermore, in this seismic isolation expansion joint 10, the sliding surface 22 is a polished surface that is smoother than the upper surface 12a of the non-seismic isolation structure 12. As a result, the sliding projection 21 can slide more easily on the sliding surface 22, reducing wear between the sliding surface 22 and the sliding projection 21 and improving the durability of the seismic isolation expansion joint 10.

[0051] Furthermore, in this seismic isolation expansion joint 10, the sliding projection 21 has a lower Young's modulus than the constituent material of the sliding surface 22, and the ratio (Ea / Eb) of the Young's modulus of the sliding projection 21 (Ea) to the Young's modulus of the constituent material of the sliding surface 22 (Eb) is 1 / 100 or less. Therefore, when the sliding projection 21 slides on the sliding surface 22, wear on the sliding projection 21 can be prevented from wearing down the sliding surface 22, thereby improving the durability of the seismic isolation expansion joint 10.

[0052] Furthermore, in this seismic isolation expansion joint 10, the sliding surface 22 is positioned lower than the upper surface 12a of the non-seismic isolation structure 12, which is covered at the tip of the connecting plate 20. Therefore, even if a sliding projection 21 is provided on the surface of the connecting plate 20 opposite to the sliding surface 22, it becomes easier to position the tip of the connecting plate 20 close to the upper surface 12a of the non-seismic isolation structure 12.

[0053] [Second Embodiment] Figure 5 is a longitudinal cross-sectional view of the seismic isolation expansion joint 10A of the second embodiment. The seismic isolation expansion joint 10A of the second embodiment has a connecting plate 20 which includes a rigid plate material 20d that is connected to the seismic isolation structure 11 so as to be able to swing up and down, and a cover 24 fixed to the tip side of the rigid plate material 20d.

[0054] In this embodiment, the rigid plate material 20d continuously covers the gap 13 of the seismic isolation clearance and the upper part of the non-seismic isolation structure 12 adjacent to the gap 13, but the leading edge of the rigid plate material 20d is positioned on the sliding surface 22 of the high-strength plate material 22a within the arrangement section 12b. As a result, a gap 25 is formed between the upper surface 20c of the rigid plate material 20d and the upper surface 12a of the non-seismic isolation structure 12. Therefore, the cover 24 is positioned to bridge the gap 25 between the upper surface 20c of the rigid plate material 20d and the upper surface 12a of the non-seismic isolation structure 12.

[0055] The cover 24 is made of a plate material such as steel having a constant thickness that is thinner than the rigid plate material 20d, and is fixed to the rigid plate material 20a by an anchor member 24a. In this embodiment, the upper surface of the cover 24 is arranged with a slope equivalent to that of the flat upper surface 12a of the non-seismic isolation structure 12, and is positioned in close proximity to the flat upper surface 12a of the non-seismic isolation structure 12. The other configurations are the same as in the first embodiment.

[0056] Even with this second embodiment, the same effects and advantages as in the first embodiment can be obtained. Furthermore, in the second embodiment, since the leading edge of the gangway 20 is formed by a cover 24 made of a plate material, the rigid plate material 20d can be made shorter than in the first embodiment, and the upper surface of the rigid plate material 20d constituting the upper surface of the gangway 20 and the upper surface 12a of the non-seismic isolation structure 12 can be set at approximately the same height.

[0057] The above embodiments can be modified as appropriate within the technical scope of the present invention. For example, in the above embodiment, the seismic isolation structure 11 is shown as an example of a seismically isolated building, and the non-seismic isolation structure is shown as an example of a road surface that people and vehicles can pass over. However, the seismic isolation structure 11 and the non-seismic isolation structure 12 may be other structures.

[0058] Furthermore, although the above embodiment described an example in which a high-strength concrete board such as an HPC board is used as the high-strength board material 22a, the high-strength board material 22a may also be made of a material other than a concrete board. In that case, the compressive strength is 100 N / mm 2 As long as the above conditions are met, any plate material can be used in which the ratio of the Young's modulus of the high-strength plate material 22a to the sliding projection 21 is 0.1 or less. Even in that case, it is desirable that the surface roughness of the sliding surface 22 be a polished surface of #400 or higher.

[0059] In the above embodiment, the rigid plate material 20a of the connecting plate 20 was rotatably connected to the seismic isolation structure by a pin structure, but the connecting plate 20 may be connected to the seismic isolation structure 11 by other structures.

[0060] In the above embodiment, a ramp 20b is provided on the connecting plate 20, but the ramp is not required.

[0061] In the above embodiment, the sliding surface 22 was formed on the surface of a high-strength plate material 22a with a compressive strength higher than that of the connecting plate 20, but it is also possible to use materials with equivalent or lower compressive strength.

[0062] In the above embodiment, the sliding surface 22 is made of a polished surface that is smoother than the upper surface 12a of the non-seismic isolation structure 12, but it does not have to be a polished surface as long as the sliding projection 21 slides.

[0063] In the above embodiment, the sliding projection 21 had a Young's modulus lower than that of the constituent material of the sliding surface 22. However, it is also possible to use the sliding projection 21 even if its Young's modulus is equal to or higher than that of the constituent material of the sliding surface 22.

[0064] In the above embodiment, the sliding surface 22 is positioned lower than the upper surface 12a of the non-seismic isolation structure 12, which is covered at the tip of the connecting plate 20. However, the sliding surface 22 can be used even if it is at the same level as or higher than the upper surface 12a of the non-seismic isolation structure 12. [Examples]

[0065] Examples of the present invention will be described below. In this embodiment, a friction test was performed on a high-strength plate material 22a made of high-strength concrete slab, using a sliding projection 21 made of a resin-based material.

[0066] The test specimen of high-strength plate material 22a was a 50cm x 20cm x 5cm HPC board. After casting and curing for a certain period, a sliding surface 22 was formed on the surface by mechanically polishing it with #400 grit. The actual compressive strength of this test specimen was 120 N / mm². 2 That is the case. On the other hand, the sliding projection 21 was a cylinder made of resin material that had been used in conventional sliding bearings. One type of sliding projection 21 was used in common for each test.

[0067] The friction test was performed using a biaxial shear reciprocating testing apparatus with a surface pressure of 2.5 N / mm². 2 ~40N / mm 2 The vibration was performed for 5 cycles with an excitation stroke of ±150 mm and an excitation speed of 10 cm / s.

[0068] Figure 6 shows the relationship between each surface pressure and the coefficient of friction. Furthermore, the condition of the sliding surface 22 of the high-strength plate material 22a was visually inspected after the friction test.

[0069] The friction test results showed a surface pressure of 10 N / mm². 2 With these conditions, the coefficient of friction could be kept below 0.01. Furthermore, even with high surface pressure, no signs of wear were observed on the sliding surface 22 of the high-strength plate material 22a.

[0070] Furthermore, the "Sustainable Development Goals (SDGs)" are among the 17 international goals adopted at the UN Summit in September 2015. The structure moving device and structure moving method according to this embodiment can contribute to achieving some of the 17 SDGs, such as Goal 11, "Make cities and human settlements inclusive, safe, resilient and sustainable." [Explanation of Symbols]

[0071] 10. Seismic isolation expansion joint 11. Seismic Isolation Structure 12 Non-seismic isolation structure 12a Top side 12b Placement section 13 Gap 14 Seismic isolation pit 15 Seismic isolation device 20 connecting planks 20a hard board material 20b Slope 20c top 20d hard board material 21 Sliding protrusion 21a Thin-walled steel plate 21b Contact surface 22 Sliding surface 22a High strength plate material 23-pin structure 24 Cover 24a Anchor member

Claims

1. A seismic isolation expansion joint that covers the gap in the seismic isolation clearance provided between a seismic isolation structure and a non-seismic isolation structure, A connecting plate whose base end is connected to the seismic isolation structure and covers the gap, and whose tip end is positioned on top of the non-seismic isolation structure, A sliding projection is provided facing downwards at a position that is vertically opposite to the upper part of the non-seismic isolation structure on the connecting plate, The non-seismic isolation structure includes a sliding surface provided on the upper part of the non-seismic isolation structure, upon which the sliding projection abuts and slides, A seismic isolation expansion joint in which the sliding surface and the upper surface of the non-seismic isolation structure that is spaced further apart from the gap than the sliding surface are covered by the aforementioned connecting plate.

2. The seismic isolation expansion joint according to claim 1, wherein the connecting plate has a rigid plate material that is vertically swingable and connected to the seismic isolation structure, and the sliding projection is provided on the rigid plate material.

3. The seismic isolation expansion joint according to claim 1, wherein a slope is formed on the tip side of the connecting plate, which slopes downward toward the upper surface of the non-seismic isolation structure.

4. The seismic isolation expansion joint according to claim 1, wherein the sliding surface is formed of a high-strength plate material having a higher compressive strength than the connecting plate, and the high-strength plate material is installed on the upper part of the non-seismic isolation structure.

5. The seismic isolation expansion joint according to claim 1, wherein the sliding surface is a polished surface that is smoother than the upper surface of the non-seismic isolation structure.

6. The seismic isolation expansion joint according to claim 1, wherein the sliding projection is made of a material having a lower Young's modulus than the material of the sliding surface.

7. The seismic isolation expansion joint according to claim 6, wherein the ratio (Ea / Eb) of the Young's modulus (Ea) of the sliding projection to the Young's modulus (Eb) of the constituent material of the sliding surface is 1 / 100 or less.

8. The seismic isolation expansion joint according to claim 1, wherein the sliding surface is provided at a lower position than the upper surface of the non-seismic isolation structure covered at the tip side of the connecting plate.

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