Inclined road construction

Abstract

To reduce a cross section of a support member for supporting a middle part of an inclined passage, and improve designability while simplifying a structure and reducing cost.SOLUTION: In a middle part of an inclined passage 1, a plurality of support members 43 and 53 for supporting the middle part are arranged at a predetermined interval, at the end of the inclined passage 1, end foundations 44 and 54 for supporting the end of the inclined passage 1 are arranged, and the inclined passage 1 is formed in a bent shape having a curvature in plan view.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ramp structure for a ramp connecting a lower entrance and an upper entrance. [Background technology]

[0002] An example of such a ramp is one that is provided with a slope connecting a lower entrance and an upper entrance, and the support structure for the slope is such that multiple support members are arranged at intervals along the length of the slope midway along the slope (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-084407 Summary of the Invention [Problem to be solved by the invention]

[0004] In a ramp like the one described above, when resisting earthquake forces in the short direction, which is perpendicular to the longitudinal direction, resistance is provided by support members such as pillars arranged at intermediate locations on the ramp, and the cross-sectional size of the support members is determined so that they have sufficient resistance to earthquake forces in the short direction.

[0005] Therefore, the cross-sectional shape of the support members such as pillars becomes large, which may lead to a complicated structure and increased costs. Also, if the ramp is a structure that is exposed to the outside of the building, it may be required from the viewpoint of design that the cross-section of the support members such as pillars be made thin, but this cannot be met.

[0006] In view of this situation, the main objective of the present invention is to provide a ramp structure that can reduce the cross-section of the support member that supports the intermediate portion of the ramp, thereby simplifying the structure and reducing costs while also improving design. [Means for solving the problem]

[0007] In a first characteristic configuration of the present invention, a plurality of support members for supporting the intermediate portion of the ramp are arranged at intervals in the intermediate portion of the ramp, An end base is provided at the end of the ramp to support the end of the ramp, The ramp has a first ramp and a second ramp formed in a curved shape with a curvature in a plan view, the first ramp is disposed so as to extend on one side of the longitudinal direction of the ramp, and the second ramp is disposed so as to extend on the other side of the longitudinal direction of the ramp, The intermediate portion of the ramp between the first ramp and the second ramp is connected to the building via an expansion joint, The end foundations include a first end foundation disposed at the end of the first ramp and a second end foundation disposed at the end of the second ramp. 、 An end of a first steel beam in the first ramp is buried in the first end foundation, and an end of a second steel beam in the second ramp is buried in the second end foundation. It's at the point.

[0008] According to this configuration, the ramp is curved in a plan view. Therefore, when an earthquake force acts on the ramp in the transverse direction, a component of the earthquake force is generated in the axial direction (longitudinal direction) of the ramp. This component of the earthquake force can be transmitted along the axial direction (longitudinal direction) of the ramp. As a result, when an earthquake force acts on the transverse direction of the ramp, the force can be transmitted as a force in the axial direction (longitudinal direction) of the ramp (axial force system force), and ultimately to the end foundation. Therefore, since the end foundation can resist the seismic force in the transverse direction of the ramp, supporting members such as columns do not need to have a cross-section large enough to sufficiently resist the seismic force in the transverse direction. As a result, the cross-section of the supporting members supporting the intermediate portion of the ramp can be reduced, simplifying the structure and reducing costs while improving design. A second characteristic configuration of the present invention is that a plurality of support members for supporting the intermediate portion of the ramp are arranged at intervals in the intermediate portion of the ramp, An end base is provided at the end of the ramp to support the end of the ramp, The ramp has a first ramp and a second ramp formed in a curved shape with a curvature in a plan view, the first ramp is disposed so as to extend on one side of the longitudinal direction of the ramp, and the second ramp is disposed so as to extend on the other side of the longitudinal direction of the ramp, The end foundations include a first end foundation disposed at an end of the first ramp and a second end foundation disposed at an end of the second ramp, The first end foundation and the second end foundation are set to have the same or approximately the same weight. According to this configuration, the ramp is curved in a plan view. Therefore, when an earthquake force acts on the ramp in the transverse direction, a component of the earthquake force is generated in the axial direction (longitudinal direction) of the ramp. This component of the earthquake force can be transmitted along the axial direction (longitudinal direction) of the ramp. As a result, when an earthquake force acts on the transverse direction of the ramp, the force can be transmitted as a force in the axial direction (longitudinal direction) of the ramp (axial force system force), and ultimately to the end foundation. Therefore, since the end foundation can resist the seismic force in the transverse direction of the ramp, supporting members such as columns do not need to have a cross-section large enough to sufficiently resist the seismic force in the transverse direction. As a result, the cross-section of the supporting members supporting the intermediate portion of the ramp can be reduced, simplifying the structure and reducing costs while improving design.

[0009] The present invention 3 A characteristic feature is that the end footing has a cross section designed for short-term loads, and the support member has a cross section designed for long-term loads.

[0010] According to this configuration, the end foundation has a cross section designed for short-term loads, and therefore has a cross section large enough to adequately resist seismic forces in the short direction of the ramp, and can appropriately resist seismic forces in the short direction of the ramp, preventing damage to the ramp, collapse, etc. Moreover, since the support member has a cross section designed for long-term loads, it is sufficient for the support member to have a cross section large enough to bear the long-term load, and the cross section of the support member can be appropriately reduced.

[0011] The present invention 4 A characteristic feature of the present invention is that the end base has a larger cross section than the support member base of the support member.

[0012] With this configuration, the end foundation has a larger cross section than the support member foundation of the support member, so the end foundation can withstand a greater force than the support member foundation. Therefore, the end foundation can adequately withstand seismic forces in the short direction of the ramp, preventing damage or collapse of the ramp.

[0013] The present invention 5 A characteristic feature of this structure is that the amount of reinforcement placed in the ramp is set to be equal to or greater than the amount of slab reinforcement placed in the ramp.

[0014] As mentioned above, when an earthquake force acts in the short direction of a ramp, that earthquake force is transmitted as a force in the axial direction (longitudinal direction) of the ramp (axial force system force). At this time, a tensile force acts in the longitudinal direction of the ramp, and strength against that tensile force is required.

[0015] Therefore, with this configuration, the amount of reinforcement placed in the ramp is set to be equal to or greater than the amount of slab reinforcement placed in the ramp. This makes it possible to increase the amount of reinforcement placed along the longitudinal direction of the ramp, thereby providing appropriate resistance to the tensile force acting in the longitudinal direction of the ramp and allowing appropriate transmission of force (axial force) in the axial direction (longitudinal direction) of the ramp. [Brief explanation of the drawings]

[0016] [Figure 1] Foundation drawing of ramp structure [Figure 2] Assembly diagram of the ramp structure seen from the building side [Figure 3] Cross-sectional view showing the first end foundation [Figure 4] Cross-section showing the second end foundation DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ramp structure according to the present invention will be described with reference to the drawings. 1 and 2, this ramp structure is a ramp structure of a ramp 1 connecting a lower entrance / exit section 2 and an upper entrance / exit section 3. In this embodiment, two ramps 1 are provided: a first ramp 4 (the ramp shown on the upper side in FIG. 1 and on the right side in FIG. 2) and a second ramp 5 (the ramp shown on the lower side in FIG. 1 and on the left side in FIG. 2).

[0018] As a result, two lower entrances 2 are provided: a first lower entrance 21 corresponding to the first ramp 4 and a second lower entrance 22 corresponding to the second ramp 5, while one upper entrance 3 is provided in common with the first ramp 4 and the second ramp 5. The upper entrance 3 is disposed in a location corresponding to the entrance of the building 6. The first lower entrance 21 and the second lower entrance 22 are disposed on the ground surface 7. As shown in FIG. 2, the ground surface 7 slopes downward from the first lower entrance 21 and the second lower entrance 22, which are both ends in the left-right direction, towards the center, and the portion corresponding to the upper entrance 3 is formed as the lowest flat portion.

[0019] In the ramp structure of this embodiment, as shown in Fig. 1, an upper entrance 3 arranged at a location corresponding to the entrance of a building 6 is connected to the building 6 via an expansion joint or the like, and the upper entrance 3 is supported by the building 6. As shown in Fig. 2, a first ramp 4 is arranged around the flat upper entrance 3, extending downward toward a first lower entrance 21 on one side in the left-right direction (the right side in Fig. 2), and a second ramp 5 is arranged extending downward toward a second lower entrance 22 on the other side in the left-right direction (the left side in Fig. 2).

[0020] As shown in Fig. 2, the first ramp 4 is provided with a first steel beam 41 extending in the longitudinal direction thereof and a first floor section 42 extending in the longitudinal direction above the first steel beam 41. A plurality of first pillar sections 43 (corresponding to support members) are arranged at intervals in a mid-section of the first ramp 4 to support the mid-section. The first floor section 42 is formed in a stepped shape, and the first ramp 4 serves as a stepped walkway along which pedestrians can walk.

[0021] 1 and 2, a first end foundation 44 (corresponding to an end foundation) is provided at the lower end of the first ramp 4, supporting the lower end of the first ramp 4. The first end foundation 44 is made of reinforced concrete, and as shown in FIG. 2, a staircase section 45 that continues to the first floor section 42 is provided at the top of the first end foundation 44. As a result, the staircase section 45 of the first end foundation 44, which extends continuously downward from the stepped first floor section 42 of the first ramp 4, is connected to the first lower entrance / exit section 21 disposed on the ground surface 7.

[0022] As shown in Fig. 2, the second ramp 5, like the first ramp 4, is provided with a second steel beam 51 extending in the longitudinal direction thereof and a second floor section 52 extending in the longitudinal direction above the second steel beam 51. A plurality of second pillar sections 53 (corresponding to support members) are arranged at intervals in the middle of the second ramp 5 to support the middle section. The second floor section 52 is formed in a sloped shape, and the second ramp 5 serves as a sloped walkway along which pedestrians can walk.

[0023] 1 and 2, a second end foundation 54 (corresponding to an end foundation) is provided at the lower end of the second ramp 5, supporting the lower end of the second ramp 5. The second end foundation 54 is made of reinforced concrete, and as shown in FIG. 2, a slope section 55 that continues to the second floor section 52 is provided at the top of the second end foundation 54. As a result, the slope section 55 of the second end foundation 54, which extends continuously downward from the sloping second floor section 52 of the second ramp 5, is connected to the second lower entrance / exit section 22 disposed on the ground surface 7.

[0024] Regarding the shapes of the first ramp 4 and the second ramp 5, as shown in Fig. 1, both the first ramp 4 and the second ramp 5 are formed in a curved shape with a curvature in a plan view. For example, the first ramp 4 and the second ramp 5 form an arc-shaped portion 61 that is arc-shaped or approximately arc-shaped with a point P1 as its center, and a bent portion 62 that is bent in a zigzag shape following the arc-shaped portion 61 is formed. The central angle of the arc-shaped portion 61 is α, and the central angle of the bent portion 62 is β.

[0025] By making the first ramp 4 and the second ramp 5 bent in a curvature in plan view, when an earthquake force acts in the short direction of the first ramp 4 and the second ramp 5, a component of the earthquake force is generated in the long direction of the first ramp 4 and the second ramp 5, and the component of the earthquake force can be transmitted along the long direction of the first ramp 4 and the second ramp 5. As a result, when an earthquake force acts in the short direction of the first ramp 4 and the second ramp 5, the earthquake force can be transmitted as a force in the long direction of the first ramp 4 and the second ramp 5 (force of the axial force system), and ultimately, the force is transmitted to the first end foundation 44 and the second end foundation 54, and the first end foundation 44 and the second end foundation 54 can resist the earthquake force in the short direction of the first ramp 4 and the second ramp 5.

[0026] In this way, since the seismic force is transmitted as a force in the longitudinal direction of the first ramp 4 and the second ramp 5 (axial force), it is preferable that the first ramp 4 and the second ramp 5 have a length equal to or greater than a predetermined length. Therefore, the lengths of the first ramp 4 and the second ramp 5 are set so that the central angle (α+β) is within a set range (for example, 90 to 180 degrees). As a result, the lengths of the first ramp 4 and the second ramp 5 can be ensured so that the central angle (α+β) is in a range of 90 degrees or greater, and the seismic force can be appropriately transmitted to the first end foundation 44 and the second end foundation 54.

[0027] When designing the first end footing 44, the second end footing 54, the first column portion 43 and the second column portion 53, the first end footing 44 and the second end footing 54 can be designed to have a cross section designed for short-term loads, and the first column portion 43 and the second column portion 53 can be designed to have a cross section designed for long-term loads.

[0028] The first end footing 44 and the second end footing 54 have cross sections designed for short-term loads, and therefore have cross sections that are sufficient to resist seismic forces in the short direction of the first end footing 44 and the second end footing 54, preventing damage or collapse of the first end footing 44 and the second end footing 54. Moreover, because the first column portion 43 and the second column portion 53 have cross sections designed for long-term loads, the first column portion 43 and the second column portion 53 only need to have cross sections large enough to bear the long-term loads, and the cross sections of the first column portion 43 and the second column portion 53 can be appropriately reduced in size.

[0029] As described above, when an earthquake force acts in the short direction of the first ramp 4 and the second ramp 5, the earthquake force is transmitted as a force (axial force) in the long direction of the first ramp 4 and the second ramp 5 and is resisted by the first end footing 44 and the second end footing 54. Therefore, as shown in FIG. 1, the first end footing 44 and the second end footing 54 have a larger cross section than the first column footing 46 (corresponding to the support member footing) of the first column 43 and the second column footing 56 (corresponding to the support member footing) of the second column 53. For example, as shown in FIG. 1, in a plan view, the first end footing 44, the second end footing 54, the first column footing 46, and the second column footing 56 are all formed in a rectangular or approximately rectangular shape in a plan view, but the first end footing 44 and the second end footing 54 are formed larger than the first column footing 46 and the second column footing 56.

[0030] The first end footing 44 and the second end footing 54 are configured to have the same or approximately the same weight. As shown in FIG. 1, the first end footing 44 is shorter than the second end footing 54 in a plan view, and therefore the cross-sectional shape of the first end footing 44 in the longitudinal direction is formed to have a heavier weight than the second end footing 54. As shown in FIG. 3, the cross-sectional shape of the second end footing 54 in the longitudinal direction is rectangular. However, as shown in FIG. 4, the cross-sectional shape of the first end footing 44 in the longitudinal direction is formed to have a convex shape with a lower portion 44b wider than an upper portion 44a. The wider lower portion 44b results in a heavier cross-sectional shape. FIG. 3 shows a cross-sectional view of the second end footing 54 at the connection point between the second end footing 54 and the second ramp 5, where a second steel beam 51 of the second ramp 5 is embedded. FIG. 4 shows a cross-sectional view of the first end foundation 44 at the connection point between the first end foundation 44 and the first ramp 4, where the first steel beam 41 of the first ramp 4 is buried.

[0031] As shown in FIG. 1 , the first ramp 4 and the second ramp 5 are provided with slab reinforcement 71 extending along their short sides and distribution reinforcement 72 extending along their longitudinal sides. While FIG. 1 shows the reinforcement arrangement of the second ramp 5, the first ramp 4 is similarly arranged and therefore not shown. Normally, the amount of reinforcement is set so that the slab reinforcement 71 is greater than the distribution reinforcement 72. However, in this embodiment, the diameter of the distribution reinforcement 72 is set to be the same as the slab reinforcement 71, so that the amount of reinforcement of the distribution reinforcement 72 is greater than or equal to the slab reinforcement 71. This increases the amount of reinforcement of the distribution reinforcement 72 arranged along the longitudinal direction of the first ramp 4 and the second ramp 5, thereby providing appropriate resistance to tensile forces acting in the longitudinal direction of the first ramp 4 and the second ramp 5 and appropriately transmitting forces (axial force system forces) in the axial direction (longitudinal direction) of the first ramp 4 and the second ramp 5.

[0032] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

[0033] (1) In the above embodiment, an example was shown in which the ramp 1 includes a first ramp 4 and a second ramp 5, but it may also be possible to include only one ramp, and the number of ramps can be changed as appropriate.

[0034] (2) In the above embodiment, the first ramp 4 and the second ramp 5 form an arc-shaped portion 61 and a curved portion 62 in a planar view, but any curved shape with curvature is sufficient, and the shape can be changed as appropriate, such as forming a combination of arc-shaped portions and straight portions, or forming a curved portion instead of an arc-shaped portion. [Explanation of symbols]

[0035] 3 Upper entrance / exit 4 1st ramp (ramp) 5 Second ramp (ramp) 21 First lower entrance / exit (lower entrance / exit) 22 Second lower entrance / exit (lower entrance / exit) 43 First column part (support member) 44 1st end foundation (end foundation) 46 First column foundation (supporting member foundation) 53 Second column part (support member) 54 Second end foundation (end foundation) 56 Second column foundation (supporting member foundation) 71 Slab Reinforcement 72 Distribution reinforcement

Claims

1. A plurality of support members are arranged at intervals along the midpoint of the ramp to support the midpoint, An end base is provided at the end of the ramp to support the end of the ramp, The ramp has a first ramp and a second ramp formed in a curved shape having a curvature in a plan view, the first ramp is disposed so as to extend on one side in the longitudinal direction of the ramp, and the second ramp is disposed so as to extend on the other side in the longitudinal direction of the ramp, An intermediate portion of the ramp between the first ramp and the second ramp is connected to the building via an expansion joint, The end foundations include a first end foundation disposed at an end of the first ramp and a second end foundation disposed at an end of the second ramp, A ramp structure in which the end of the first steel beam in the first ramp is buried in the first end foundation, and the end of the second steel beam in the second ramp is buried in the second end foundation.

2. A plurality of support members are arranged at intervals along the midpoint of the ramp to support the midpoint, An end base is provided at the end of the ramp to support the end of the ramp, The ramp has a first ramp and a second ramp formed in a curved shape having a curvature in a plan view, the first ramp is disposed so as to extend on one side in the longitudinal direction of the ramp, and the second ramp is disposed so as to extend on the other side in the longitudinal direction of the ramp, The end foundations include a first end foundation disposed at an end of the first ramp and a second end foundation disposed at an end of the second ramp, The ramp structure according to claim 1 , wherein the first end foundation and the second end foundation are set to have the same or approximately the same weight.

3. 3. A ramp structure according to claim 1 or 2, wherein the end footings have cross sections designed for short-term loads and the support members have cross sections designed for long-term loads.

4. 4. A ramp structure according to claim 1, wherein the end foundation has a cross section larger than the support member foundation of the support member.

5. A ramp structure as described in any one of claims 1 to 4, wherein the reinforcement reinforcement arranged in the ramp is set so that the amount of reinforcement is equal to or greater than the amount of slab reinforcement arranged in the ramp.

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