Pedestrian bridge

Abstract

To provide a pedestrian bridge having a high design without requiring the use of massive column bases.SOLUTION: A pedestrian bridge 1 comprises a first elevating part 4a having a plurality of first tread plates 3a helically arranged around a first shaft 2a and laminated to each other in the first shaft 2a, a second elevating part 4b having a plurality of second tread plates 3b helically arranged around a second shaft 2b and laminated to each other in the second shaft, and a connecting part 6 in which the first tread plates 3a other than the lowermost stage and the second tread plates 3b other than the lowermost stage are connected.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pedestrian bridge that is provided so as to cross a road, a river, or a line such as a railway. [Background technology]

[0002] Conventionally, a pedestrian bridge that is constructed to cross roads, rivers, or lines such as railways has been known that has a bridge girder that is supported by a pair of pillars to form a pedestrian surface, and a pair of stairs or other access sections connected to both ends of the bridge girder (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-227824 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional pedestrian bridges, the bridge girder is supported by a pair of pillars, so when the bridge girder has a long span, the bending moment borne by the pillars becomes large. Therefore, the column bases supporting the pillars need to be heavy, which causes a problem that the design of the pedestrian bridge is impaired.

[0005] An object of the present invention is to provide a pedestrian bridge with a highly aesthetic design that does not require the use of heavy column bases. [Means for solving the problem]

[0006] The pedestrian bridge of the present invention is characterized in having a first lifting section having a plurality of first tread materials arranged in a spiral shape around a first axis and stacked on each other at the first axis, a second lifting section having a plurality of second tread materials arranged in a spiral shape around a second axis and stacked on each other at the second axis, and a connecting section connecting the first tread materials other than the lowest step and the second tread materials other than the lowest step.

[0007] In the pedestrian bridge of the present invention, in the above-mentioned configuration, it is preferable that the connecting portion connects the first tread material which is within a range of 90 degrees or more and 180 degrees or less in a spiral direction centered on the first axis from the first tread material at the lowest level, and the second tread material which is within a range of 90 degrees or more and 180 degrees or less in a spiral direction centered on the second axis from the second tread material at the lowest level.

[0008] In the pedestrian bridge of the present invention, in the above-mentioned configuration, it is preferable that the multiple first tread materials each have a first protrusion portion extending on the opposite side of the first axis from the portion that constitutes the first lifting section, and the multiple second tread materials each have a second protrusion portion extending on the opposite side of the second axis from the portion that constitutes the second lifting section.

[0009] In addition, in the pedestrian bridge of the present invention, in the above-mentioned configuration, it is preferable that the longitudinal length of the multiple first tread materials is longer on the upper step side than on the lower step side, and that the longitudinal length of the multiple second tread materials is longer on the upper step side than on the lower step side.

[0010] Furthermore, in the above-mentioned configuration, the pedestrian bridge of the present invention preferably has through bolts that penetrate the multiple first tread materials and join the multiple first tread materials. Effect of the Invention

[0011] According to the present invention, a pedestrian bridge with a highly aesthetic design can be provided, which does not require the use of heavy column bases. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a pedestrian bridge according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the pedestrian bridge shown in FIG. [Diagram 3] FIG. 2(a) is a front view showing the outline of the structure of the footbridge shown in FIG. 1, and FIG. 2(b) is a perspective view explaining the distribution of forces in the footbridge shown in FIG. [Figure 4] FIG. 1(a) is a plan view showing another embodiment of the present invention, and FIG. [Diagram 5] FIG. 1(a) is a diagram showing the overlap of two first step materials of the first lifting section of the present invention, FIG. 1(b) is an enlarged cross-sectional view along line XX of FIG. 1(a), and FIG. 1(c) is an oblique view of the upper first step material as viewed from the bottom. [Figure 6] FIG. 13 is a diagram showing the arrangement of through bolts in the first column portion. [Figure 7] 2 is a schematic diagram showing a vertical cross section of a first lift section of the pedestrian bridge shown in FIG. 1. [Figure 8] 1A is an exploded perspective view of the connecting portion before connection, FIG. 1B is an oblique view of the connecting portion in a connected state, FIG. 1C is a plan view of the connecting portion, FIG. 1D is an enlarged cross-sectional view along line YY in FIG. 1C, and FIG. 1E is an enlarged cross-sectional view along line ZZ in FIG. [Figure 9] FIG. 13 is a perspective view showing yet another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a pedestrian bridge according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0014] A pedestrian bridge 1 according to an embodiment of the present invention shown in Figs. 1 and 2 is provided so as to cross, for example, a road, a river, or a line such as a railway.

[0015] The pedestrian bridge 1 has a first lifting section 4a which has a plurality of first tread materials 3a which are arranged in a spiral shape around a first axis 2a and stacked on each other at the first axis 2a, a second lifting section 4b which has a plurality of second tread materials 3b which are arranged in a spiral shape around a second axis 2b and stacked on each other at the second axis 2b, and a connecting section 6 which connects the first tread material 3a which is located within a range of 90 degrees or more and 180 degrees or less in the spiral direction around the first axis 2a from the lowest first tread material 3a, and the second tread material 3b which is located within a range of 90 degrees or more and 180 degrees or less in the spiral direction around the second axis 2b from the lowest second tread material 3b.

[0016] The first step material 3a and the second step material 3b may be long and planar in shape, so long as the width, length and thickness are such that the user can use them as a staircase or a stepped slope. The width, length and thickness may be changed or may be different from each other. In this embodiment, the first step material 3a and the second step material 3b are long and narrow planar in shape, with a constant width perpendicular to the longitudinal direction in a plan view. It is preferable to use a laminated board material (CLT) composed of multiple wooden boards laminated with the fiber direction perpendicular to each other as the first step material 3a and the second step material 3b, but wood such as a wooden laminated board material other than CLT may also be used. In addition, the first step material 3a and the second step material 3b are not limited to wood, and may be, for example, a board material made of metal, precast concrete, resin or a combination of these.

[0017] As described above, the first ascending / descending section 4a is configured by stacking the multiple first tread materials 3a on the first axis 2a and arranging them in a spiral shape around the first axis 2a. The multiple first tread materials 3a may also be stacked on top of each other in areas other than the first axis 2a. The first axis 2a is a vertical axis. As a result, the multiple first tread materials 3a form a staircase that extends in a spiral shape around the first axis 2a. The first ascending / descending section 4a is fan-shaped as a whole. In addition, the multiple first tread materials 3a stacked on top of each other on the first axis 2a form a columnar first column portion 5a that extends in the vertical direction along the first axis 2a. The first column portion 5a functions as a support for the footbridge 1.

[0018] Similarly, the second ascending / descending section 4b is configured such that the multiple second tread materials 3b are stacked on each other on the second axis 2b and arranged in a spiral shape around the second axis 2b as described above. The multiple second tread materials 3b may also be stacked on each other in parts other than the second axis 2b. The second axis 2b is an axis parallel to the first axis 2a. As a result, the multiple second tread materials 3b form a staircase that extends in a spiral shape around the second axis 2b. The second ascending / descending section 4b is fan-shaped as a whole. In addition, the multiple second tread materials 3b stacked on each other on the second axis 2b form a columnar second column portion 5b that extends in the vertical direction along the second axis 2b. The second column portion 5b functions as a support for the footbridge 1.

[0019] In the footbridge 1 according to this embodiment, the first lifting and descending section 4a and the second lifting and descending section 4b have shapes or arrangements that are point symmetrical with respect to the connecting section 6 in plan view. The first lifting and descending section 4a and the second lifting and descending section 4b may have shapes or arrangements that are line symmetrical with respect to the connecting section 6 in plan view. The sizes and shapes of the first lifting and descending section 4a and the second lifting and descending section 4b can be changed in various ways and may be the same or may be different depending on the topography of the installation location of the footbridge 1 and the surrounding environment.

[0020] The connecting portion 6 connects the first and second lifting portions 4a and 4b at the first and second tread members 3a and 3b. The first and second tread members 3a and 3b connected by the connecting portion 6 form a bridge girder 7 between the first and second lifting portions 4a and 4b of the footbridge 1.

[0021] The first tread material 3a connected to the second tread material 3b at the connecting portion 6 is the first tread material 3a whose angle α in the spiral direction about the first axis 2a (the circumferential direction about the first axis 2a as viewed from the axial direction of the first axis 2a) from the lowest first tread material 3a is in the range of 90 degrees or more and 180 degrees or less. As shown in Fig. 2, in this embodiment, the first tread material 3a connected to the second tread material 3b by the connecting portion 6 is the uppermost first tread material 3a which is shifted 180 degrees in the spiral direction about the first axis 2a from the lowest first tread material 3a.

[0022] Similarly, the second tread material 3b connected to the first tread material 3a by the connecting portion 6 is a second tread material 3b whose angle β in the spiral direction about the second axis 2b (the circumferential direction about the second axis 2b when viewed from the axial direction of the second axis 2b) from the lowest second tread material 3b is in the range of 90 degrees or more and 180 degrees or less. As shown in Fig. 2, in this embodiment, the second tread material 3b connected to the first tread material 3a by the connecting portion 6 is the uppermost second tread material 3b that is shifted 180 degrees in the spiral direction about the second axis 2b from the lowest second tread material 3b.

[0023] In addition, when a single plate serves as both the first tread material 3a and the second tread material 3b, such as when the topmost first tread material 3a and the topmost second tread material 3b are formed from a single plate and arranged overlapping both the first axis 2a and the second axis 2b, the plate constitutes the connecting portion 6.

[0024] As described above, the pedestrian bridge 1 in this embodiment has a first lifting section 4a and a second lifting section 4b, each of which is configured as a spiral staircase, and the first tread material 3a other than the lowest step and the second tread material 3b other than the lowest step are connected by a connecting section 6, so that a bridge girder 7 is provided between the first lifting section 4a and the second lifting section 4b.

[0025] With this configuration, the pedestrian bridge 1 according to this embodiment has the first and second lifting sections 4a and 4b each having a fan shape, and is arch-shaped as a whole when viewed from the front perpendicular to the imaginary plane including the first and second axes 2a and 2b, as shown in Fig. 3(a) and 3(b). Therefore, the load applied to the pedestrian bridge 1 is continuously transmitted to the ground or foundation by the spiral first and second lifting sections 4a and 4b that form an arch as shown by arrow A, and the inward bending moment (shown by arrow C) applied to the first and second tread members 3a and 3b supported in a cantilever manner by the first and second columns 5a and 5b is distributed by the arch shape and borne as an axial force (shown by arrow B) by the first and second columns 5a and 5b that function as supports. This allows the pedestrian bridge 1 to be configured so that the load applied to the bridge girder 7 can be supported by the first column portion 5a to the second column portion 5b without using heavy column bases, thereby improving the design of the pedestrian bridge 1.

[0026] The first tread material 3a and the second tread material 3b connected by the connecting portion 6 are respectively the first tread material 3a located within a range of 90 degrees or more and 180 degrees or less in the spiral direction centered on the first axis 2a from the lowest first tread material 3a, and the second tread material 3b located within a range of 90 degrees or more and 180 degrees or less in the spiral direction centered on the second axis 2b from the lowest second tread material 3b. With this configuration, the pedestrian bridge 1 can be made into an arch shape that can more effectively distribute the inward bending moment applied to the first tread material 3a to the second tread material 3b.

[0027] 4, the first lifting section 4a and the second lifting section 4b may be configured such that one or more first tread members 3a to second tread members 3b are further arranged in a spiral shape around the first shaft 2a to second shaft 2b above the first tread member 3a to second tread member 3b, which are connected to each other by a connecting portion 6. Even with such a configuration, the same effect as above can be obtained.

[0028] In this embodiment, as shown in Fig. 5(a), the first lifting section 4a is configured such that the first step material 3a is arranged in a spiral shape with the first step material 3a in the lower tier overlapping with the first step material 3a in the upper tier, and as shown in Fig. 5(b), the overlapping area of ​​the first step material 3a in the lower tier and the first step material 3a in the upper tier may be fixed with a fastener 9. The fastener 9 may be, for example, a screw, a long screw, a bolt, or the like, and the upper part of the fastener 9 such as a fixed screw may be covered with a wooden plug (dowel filling). The second lifting section 4b may be configured in the same manner as above.

[0029] In this embodiment, as shown in FIG. 5(b) and FIG. 5(c), the upper first step material 3a can be configured to have a notch 8 in the area where it overlaps with the lower first step material 3a. By providing the notch 8 on the bottom surface (the surface facing the first step material 3a) of the upper first step material 3a that is stacked on the lower first step material 3a, the positioning of the upper first step material 3a can be made easier and the workability at the site can be improved. In addition, the horizontal shift of the stacked upper and lower first step materials 3a can be prevented, and the load on the fixing device 9 can be reduced. Furthermore, if the fixing device 9 is damaged, the position shift of the stacked upper and lower first step materials 3a can be prevented (fail-safe function). The second lifting section 4b can also be configured in the same manner as above.

[0030] As shown in Figs. 6 and 7, the first column portion 5a can be configured such that all of the first tread materials 3a are joined together in the peripheral region of the first axis 2a by a single or multiple through-bolts 10 that penetrate all of the first tread materials 3a. Specifically, the first column portion 5a is formed by stacking multiple first tread materials 3a, and the through-bolts 10 are inserted into bolt holes (not shown) provided on the peripheral edge of the first axis 2a to fasten them together. In this embodiment, the multiple first tread materials 3a are fastened together by four through-bolts 10 arranged at equal intervals around the first axis 2a. This increases the shear force between a pair of first tread materials 3a stacked vertically, and increases the rigidity and toughness of the first column portion 5a and the first lifting portion 4a. This increases the earthquake resistance and wind load resistance of the footbridge 1. In addition, when the first lift section 4a is formed by stacking a plurality of first tread members 3a from bottom to top, the through-bolt 10 functions as a guide for positioning each tread member 3a, thereby improving the workability of the first lift section 4a. The second lift section 4b can also be configured in the same manner as above.

[0031] In this embodiment, as shown in Fig. 8(a)-(e), the connecting portion 6 may be configured to join the first step material 3a and the second step material 3b with a half-lap joint. Specifically, as shown in Fig. 8(a) and (b), the first step material 3a and the second step material 3b have joint parts 11 formed by cutting a part of the upper and lower surfaces into a thin rectangular shape, and the joint parts 11 of the first step material 3a and the joint parts 11 of the second step material 3b are joined so as to overlap each other. With this configuration, the first step material 3a and the second step material 3b can be firmly joined. In addition, the part joined by the joint parts 11 may be reinforced and fixed with a joining fastener 12 such as a screw or a bolt.

[0032] As shown in Figures 1 and 2, in this embodiment, it is preferable that the multiple first tread materials 3a each have a first protrusion portion 13a extending on the opposite side of the first axis 2a from the portion that constitutes the stairs of the first lifting section 4a, and the multiple second tread materials 3b each have a second protrusion portion 13b extending on the opposite side of the second axis 2b from the portion that constitutes the stairs of the second lifting section 4b.

[0033] With the above configuration, the bending moment (indicated by arrow C in FIG. 3) applied to the portion of the first tread material 3a that constitutes the staircase can be reduced by the opposite bending moment generated by the first protruding portion 13a that protrudes on the opposite side of the first tread material 3a that constitutes the staircase across the first axis 2a. Similarly, the bending moment (indicated by arrow C in FIG. 3) applied to the portion of the second tread material 3b that constitutes the staircase can be reduced by the opposite bending moment generated by the second protruding portion 13b that protrudes on the opposite side of the second tread material 3b that constitutes the staircase across the second axis 2b. This makes it possible to reduce the thrust force generated between the first tread material 3a or between the second tread material 3b in the entire pedestrian bridge 1.

[0034] The first protruding portion 13a of the first lifting / lowering section 4a and the second protruding portion 13b of the second lifting / lowering section 4b are each stepped, and therefore can be used as a lifting mechanism separate from the first lifting / lowering section 4a or the second lifting / lowering section 4b.

[0035] As shown in Fig. 5(a), the length P of the first protrusion 13a is preferably the same as or shorter than the length Q of the portion of the first tread material 3a that constitutes the staircase (P < Q). The same is true for the second protrusion 13b and the second tread material 3b.

[0036] The footbridge 1 is preferably configured such that the longitudinal length (P+Q in FIG. 5) of the first step members 3a constituting the first ascending / descending section 4a is longer on the upper stage side than on the lower stage side, and the longitudinal length of the second step members 3b constituting the second ascending / descending section 4b is longer on the upper stage side than on the lower stage side. With this configuration, the length of the bridge girder 7 can be increased to ensure the span between the first column member 5a and the second column member 5b, which serve as the support columns, while the footbridge 1 can be constructed in a structure in which the overall shape is arched when viewed from the front. The longitudinal lengths of the first step members 3a constituting the first ascending / descending section 4a and the longitudinal lengths of the second step members 3b constituting the second ascending / descending section 4b may all be constant.

[0037] As shown in another embodiment in Figure 9, the pedestrian bridge 1 may be configured so that handrails 15 are provided at each of the first and second lift sections 4a, 4b, and one or more stages 16 that can be used as rest areas are disposed at each of the first and second lift sections 4a, 4b.

[0038] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention.

[0039] For example, the first tread material 3a connected to the second tread material 3b at the connecting portion 6 may be any first tread material 3a other than the lowest first tread material 3a, such as the topmost first tread material 3a. Also, the second tread material 3b connected to the first tread material 3a by the connecting portion 6 may be any second tread material 3b other than the lowest second tread material 3b, such as the topmost second tread material 3b. [Explanation of symbols]

[0040] 1. Pedestrian bridge 2a First axis 2b Second axis 3a First step board material 3b Second tread material 4a First lift section 4b Second lift section 5a First pillar part 5b Second pillar part 6 Connecting part 7 Bridge girder 8 Cutout 9 Fixtures 10 through bolt 11 Joint 12 Joint fixture 13a First protruding part 13b Second protruding part 15 Handrails 16 Stages α angle β angle A Load B Axial force C bending moment

Claims

1. A first lifting section including a plurality of first tread members arranged in a spiral shape around a first axis and stacked on each other at the first axis; A second lifting section including a plurality of second tread members arranged in a spiral shape around a second axis and stacked on each other on the second axis; A pedestrian bridge characterized by having a connecting portion at which the first tread material other than the lowest step and the second tread material other than the lowest step are connected.

2. 2. The pedestrian bridge of claim 1, wherein the connecting portion connects the first tread material located within a range of 90 degrees or more and 180 degrees or less in a spiral direction centered on the first axis from the first tread material at the lowest level, and the second tread material located within a range of 90 degrees or more and 180 degrees or less in a spiral direction centered on the second axis from the second tread material at the lowest level.

3. Each of the first stepping members has a first protruding portion extending on the opposite side of the first axis from the portion constituting the first lifting portion, 3. The pedestrian bridge according to claim 1 or 2, wherein each of the second tread members has a second protruding portion extending on the opposite side to the portion constituting the second lift section with respect to the second axis.

4. The length of the first tread members in the longitudinal direction is longer on the upper side than on the lower side, 3. The footbridge according to claim 1 or 2, wherein the longitudinal length of the plurality of second tread members is longer on an upper step side than on a lower step side.

5. 3. The pedestrian bridge according to claim 1 or 2, further comprising a through-bolt that passes through a plurality of said first tread materials and joins the plurality of said first tread materials.

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