Wall railing and installation structure of wall railing

Abstract

To effectively absorb variation and expansion / contraction of bridge girders.SOLUTION: A steel wall balustrade 1 to be installed on a bridge includes: a wall body (10) that is formed into a hollow box shape with a pair of left and right side plates (12, 13) facing each other and spaced apart in a direction of a bridge axis, and can accommodate therein a linear body (80); plate-shaped reinforcing ribs (40) that extend vertically inside the wall body (10); side holes (12B, 13B) that penetrate the side plates and into which the linear body (80) can be inserted; and rib holes (44) that penetrate the reinforcing ribs (40) and into which the linear body (80) can be inserted, wherein at least one or both of the side holes (12B, 13B) and the front rib holes (44) are formed into long hole shapes in an up-down direction.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a wall railing and an installation structure of the wall railing, and particularly relates to a technology suitable for the installation of a steel wall railing.

Background Art

[0002] Generally, a wall railing that functions as a protective fence is provided on the side of a bridge such as an elevated highway bridge. In such a wall railing, linear bodies such as wiring for electric wires or communication, and pipes for inserting the wiring may be accommodated. For example, in Patent Document 1, wiring is accommodated inside the coping of a railing installed on a bridge or the like, connectors are provided at both ends of the wiring, and when connecting a plurality of railings in the bridge axis direction, the connectors are connected to each other to eliminate the need for electrical work.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An expansion device for absorbing fluctuations and expansions of girders due to temperature changes, earthquakes, and passage of vehicles is provided at a connection portion that connects the floor slabs of a bridge to each other in the bridge axis direction. Also, at the connection portion of the bridge, a pair of wall railings are installed spaced apart in the bridge axis direction with the expansion device interposed therebetween. When accommodating wiring or pipes inside such a wall railing, the wiring or pipes need to have a structure that can absorb fluctuations and expansions of the bridge at the connection portion.

[0005] In the technology described in Patent Document 1 above, the wiring is arranged substantially linearly inside the coping, and since the wiring is connected to each other by connectors, there is a risk that these wirings and connectors cannot absorb fluctuations and expansions of the bridge and may be damaged.

[0006] To absorb the movement and expansion of a bridge, one possible structure involves connecting wall parapets that are spaced apart by expansion joints using pipes that can expand and contract in the bridge axis direction, and inserting wiring inside these pipes. However, with pipes that can only expand and contract in the bridge axis direction, there is a problem in that the pipes cannot deform in accordance with vibrations acting in the vertical direction or in a direction perpendicular to the bridge axis direction, such as during an earthquake, which can lead to pipe damage.

[0007] To address vibrations in the vertical direction and directions perpendicular to the bridge axis, one possible structure involves installing pull boxes on the back of each wall parapet, connecting the pull boxes with flexible pipes, and inserting wiring inside these flexible pipes. However, installing the pull boxes on the back of the wall parapet presents challenges in maintenance, such as the need to access the pull boxes from the road side of the bridge using a high-altitude work vehicle, or to provide a separate inspection path on the outside of the bridge to access the pull boxes, thus worsening maintainability. Furthermore, in snowy areas, there is a risk of snow or icicles falling from the top of the pull boxes, necessitating safety measures for vehicles and people passing beneath the bridge.

[0008] The technology disclosed herein was developed in view of the above circumstances, and aims to effectively improve maintainability of the wall parapet while effectively absorbing the fluctuations and expansions of the bridge girder. [Means for solving the problem]

[0009] The wall railing in this disclosure is Steel wall railings (1A, 1B) installed on bridges, The bridge is formed in a hollow box shape having a pair of left and right side plates (12, 13) that are spaced apart and facing each other in the bridge axis direction, and has a wall body (10) capable of housing a linear body (80) inside, The wall body (10) has plate-shaped reinforcing ribs (40) that extend vertically inside, The side plates (12, 13) have side holes (12B, 13B) that penetrate in the thickness direction and into which the linear body (80) can be inserted, The reinforcing rib (40) is provided with a rib hole (44) that penetrates in the thickness direction of the plate and into which the linear body (80) can be inserted. The present invention is characterized in that at least one or both of the side holes (12B, 13B) and the rib holes (44) are formed in the shape of elongated holes that are long in the vertical direction.

[0010] In other embodiments of the wall railings of this disclosure, The side holes (12B, 13B) are formed in the elongated shape, The rib hole (44) is formed in the shape of a circular hole and is provided in the upper portion of the reinforcing rib (40) from the midpoint in the vertical direction. It is preferable that the linear body (80), which is inserted into the side holes (12B, 13B) and housed inside the wall body (10), is lifted upward and supported by the rib holes (44).

[0011] In other embodiments of the wall railings of this disclosure, The reinforcing ribs (40) are provided in multiple quantities. Of the multiple reinforcing ribs (40), the rib holes (44M) of at least one reinforcing rib (40M) are formed in the shape of circular holes, while the rib holes (44L, 44R) of the other reinforcing ribs (40L, 40R) are formed in the shape of elongated holes. It is preferable that the linear body (80) inserted into the elongated side holes (12B, 13B) and the elongated rib holes (44L, 44R) is lifted upward and supported by the circular rib hole (44M).

[0012] In other embodiments of the wall railings of this disclosure, Preferably, the wall body (10) faces the road side of the bridge and has a front plate (20) that is detachably attached to the wall body (10).

[0013] In other embodiments of the wall railings of this disclosure, The box-shaped structure (70) is formed having a pair of left and right side plates (72, 73) that are spaced apart and facing each other in the direction of the bridge axis, and is fitted and fixed into the cut-out portion of the reinforcing rib (40), and has a box-shaped structure (70) inside which the linear body (80) can be housed, The side plates (72, 73) have circular holes (72A, 73A) that penetrate in the thickness direction and into which the linear body (80) can be inserted, Of the side plate holes (72A, 73A) provided in the pair of side plates (72, 73), one side plate hole (73A) is located above the other side plate hole (72A). It is preferable that the linear body (80) housed inside the box (70) is lifted upward as it moves from the other side plate hole (72A) toward the one side plate hole (73A).

[0014] The installation structure of the wall railing in this disclosure is, The pair of wall railings (1A, 1B) are spaced apart in the bridge axis direction with an expansion joint (600) connecting the deck slabs of the bridge in between, and the linear body (80) is inserted into the side holes (12B, 13B) of the pair of wall railings (1A, 1B) to house the linear body (80) within the wall body (10) of the pair of wall railings (1A, 1B). The linear body (80) is then lifted and supported upward within the wall body (10), causing the linear body (80) to bend downward between the pair of wall body (10).

[0015] Another aspect of the present disclosure is a steel second wall parapet (1C) connected to the wall parapets (1A, 1B) in the bridge axis direction, It is formed in a hollow box shape having a pair of left and right second side plates (12, 13) that are spaced apart and facing each other in the direction of the bridge axis, and a second wall body (10) capable of accommodating the linear body (80), The second side plates (12, 13) have second side holes (12B, 13B) that penetrate in the thickness direction and into which the linear body can be inserted, A plate-like second reinforcing rib (40C) extending vertically inside the second wall body (10); A hollow box shape having a pair of left and right second side plates (72, 73) facing each other with a gap in the bridge axis direction, and is fitted and fixed to a portion where the second reinforcing rib (40C) is cut out, and a second box body (70) capable of accommodating the linear body (80) inside; Second side plate holes (72A, 73A) penetrating the second side plates (72, 73) in the plate thickness direction and into which the linear body (80) can be inserted; Among the second side plate holes (72A, 73A) provided in the pair of second side plates (72, 73) respectively, when the second wall railing (1C) is connected to the wall railings (1A, 1B), one second side plate hole (73A) closer to the wall railings (1A, 1B) is located above the other second side plate hole (72A); The linear body (80) accommodated inside the second box body (70) is lifted upward as it goes from the other second side plate hole (72A) to the one second side plate hole (73A).

[0016] In the above description, for the purpose of helping to understand the invention, reference numerals used in the embodiments are added in parentheses to the constituent elements of the invention corresponding to the embodiments. However, each constituent element of the invention is not limited to the embodiments defined by the above reference numerals. Further, the wall railing of the present disclosure is also applicable to the wall railing of the central separation strip separating the upper and lower lines of the road.

Effect of the Invention

[0017] According to the technology of the present disclosure, regarding the wall railing, it is possible to effectively absorb the fluctuations and expansions and contractions of the bridge girder while effectively improving the maintainability.

Brief Description of the Drawings

[0018] [Figure 1] It is a schematic perspective view showing the wall railing according to this embodiment. [Figure 2] It is a schematic exploded perspective view of the wall railing shown in FIG. 1. [Figure 3]This is a schematic longitudinal cross-section of the railing wall according to this embodiment, cut in the direction of the road width of the bridge. [Figure 4] This is a schematic longitudinal cross-sectional view of the wall railing according to the first embodiment, cut in the direction of the bridge axis of the bridge. [Figure 5] This is a schematic, straight-aspect view illustrating the installation structure of a wall railing according to the first embodiment. [Figure 6] This is a schematic perspective view showing a modified example of a wall railing. [Figure 7] This is a schematic perspective view showing a modified example of a wall railing. [Figure 8] This is a schematic, upright view showing the railing of a modified wall. [Figure 9] This is a schematic exploded perspective view of the wall railing according to the second embodiment. [Figure 10] This is a schematic exploded perspective view of the wall railing according to the second embodiment. [Figure 11] This is a schematic exploded perspective view of the wall railing according to the second embodiment. [Figure 12] This is a schematic, straight-aspect view illustrating the installation structure of a wall railing according to the second embodiment. [Figure 13] This is a schematic, upright view showing the railing of a modified wall. [Figure 14] This is a schematic diagram illustrating the conventional structure. [Figure 15] This is a schematic diagram illustrating the conventional structure. [Modes for carrying out the invention]

[0019] The wall railing and its installation structure according to this embodiment will be described below based on the attached drawings. The same reference numerals are used for identical parts, and their names and functions are the same. Therefore, detailed explanations of them will not be repeated.

[0020] [Overall structure] Figure 1 is a schematic perspective view showing the wall railing 1 according to this embodiment, and Figure 2 is an exploded perspective view of the wall railing 1 shown in Figure 1. Figure 3 is a schematic longitudinal cross-sectional view of the wall railing 1 according to this embodiment.

[0021] The parapet wall 1 shown in Figures 1 and 2 is a steel parapet wall constructed by assembling multiple steel members. Steel parapet wall walls have the advantage of significantly shortening construction time because they eliminate the need for processes such as formwork assembly, rebar assembly, and concrete pouring that are required when installing cast-in-place concrete parapet wall walls. Furthermore, because steel parapet wall walls have a hollow structure, they have the advantage of significantly reducing weight compared to cast-in-place concrete or precast concrete parapet wall walls, thus reducing the load on the bridge.

[0022] As shown in Figures 1 and 2, the wall railing 1 comprises a main body portion 10, a main body cover portion 20, and a curb cover portion 30. The main body portion 10 and the main body cover portion 20 constitute the wall body of this disclosure. Each of these main body portion 10, main body cover portion 20, and curb cover portion 30 is formed by bending or welding a metal plate material such as a steel plate.

[0023] In the following, the vertical direction when the parapet 1 is installed on the side of the bridge will be referred to as the "vertical direction" of the parapet 1. The bridge axis direction of the bridge will be referred to as the "left-right direction" of the parapet 1, and the horizontal direction perpendicular to the bridge axis direction will be referred to as the "front-to-back direction" of the parapet 1. Therefore, in the following explanation, of the sides of the parapet 1, the side facing the road on the bridge will be referred to as the "front" of the parapet 1, the side opposite the road will be referred to as the "rear" of the parapet 1, the left end face when viewed from the road side will be referred to as the "left side" of the parapet 1, and the right end face when viewed from the road side will be referred to as the "right side" of the parapet 1.

[0024] The main body 10 includes a base plate 11 that forms the bottom of the wall railing 1. The base plate 11 is formed in the shape of a rectangular plate that is long in the left-right direction. The dimensions of the base plate 11 are not particularly limited, but can be set based on the dimensions of the bottom of a standard wall railing. In this embodiment, the length (width) of the base plate 11 in the left-right direction is, for example, 100 cm to 200 cm, and the length (depth) of the base plate 11 in the front-back direction is, for example, 40 cm to 50 cm.

[0025] The base plate 11 is provided with a plurality of insertion holes 11A (see Figure 3) that penetrate the base plate 11 in the thickness direction. The position and number of insertion holes 11A are not particularly limited, but can be appropriately set according to the position and number of stud bolts B1 (or anchor bolts) that protrude upward from the floor slab FS. When installing the wall parapet 1 to the floor slab FS, the stud bolts B1 are inserted into the insertion holes 11A and nuts N1 are screwed onto the stud bolts B1 and tightened. At this time, mortar (not shown) may be laid between the floor slab FS and the base plate 11.

[0026] Multiple brackets 11B are provided at the front end of the base plate 11, arranged at predetermined intervals in the left-right direction. Preferably, the brackets 11B are fixed to the upper surface of the base plate 11 by welding or the like. Note that fixing of the brackets 11B is not limited to welding, and they may also be fixed using fasteners such as bolts and nuts. The brackets 11B are provided with insertion holes 11C for inserting bolts B2 (see Figure 3). By screwing the bolts B2 onto nuts N2 and tightening them, the lower end of the curb cover portion 30 is attached to the bracket 11B. The nuts N2 may be fixed to the back of the bracket 11B in advance by welding or the like, or they may be screwed onto the bolts B2 when inserting them. Note that if the wall parapet 1 does not require a curb cover portion 30, the brackets 11B may be omitted.

[0027] The main body 10 further includes a left side plate 12 that forms the left side of the wall railing 1 and a right side plate 13 that forms the right side of the wall railing 1. The left side plate 12 extends upward from the left end of the base plate 11, and the right side plate 13 extends upward from the right end of the base plate 11. That is, the left side plate 12 and the right side plate 13 are spaced apart in the left-right direction with the base plate 11 in between and face each other. In the following, unless there is a particular need to distinguish between them, the left side plate 12 and the right side plate 13 will simply be referred to as "side plates 12, 13".

[0028] The side plates 12 and 13 are formed in a roughly rectangular shape that is elongated in the vertical direction. Preferably, the length of the side plates 12 and 13 in the front-to-back direction is shorter than the length of the base plate 11 in the front-to-back direction. The dimensions of the side plates 12 and 13 are not particularly limited, but can be set based on the dimensions of the sides of a standard wall railing. In this embodiment, the length (height) of the side plates 12 and 13 in the vertical direction is, for example, 90 cm to 100 cm, and the length (depth) in the front-to-back direction is, for example, 20 cm to 40 cm.

[0029] The side plates 12 and 13 are fixed to the upper surface of the base plate 11 by welding or the like, such that the rear end of the lower edge of the side plate 12 and 13 substantially coincides with the rear corner of the base plate 11. Note that the fixing of the side plates 12 and 13 is not limited to welding; they can also be fixed using fasteners such as bolts and nuts. The side plates 12 and 13 have multiple bolt insertion holes 12A and 13A formed through them in the thickness direction for inserting bolts when connecting to other wall railings. Furthermore, the side plates 12 and 13 are provided with pipe insertion holes 12B and 13B for inserting flexible pipes 80 (see Figures 4 and 5), which will be described later. The pipe insertion holes 12B and 13B are examples of side holes in this disclosure. Details of the pipe insertion holes 12B and 13B will be described later.

[0030] The main body 10 is further equipped with a cover fixing plate 14 for attaching the lower end of the main body cover 20. The cover fixing plate 14 is fixed by welding or the like to the lower portion of the front edge of the side plates 12 and 13 and the upper surface of the base plate 11. The length (width) of the cover fixing plate 14 in the left-right direction is approximately the same as the length of the base plate 11 in the left-right direction, and the length (height) of the cover fixing plate 14 in the up-down direction is shorter than the length of the side plates 12 and 13 in the up-down direction. The length (height) of the cover fixing plate 14 in the up-down direction is not particularly limited, but it is sufficient to ensure that it is long enough to fix the main body cover 20.

[0031] The cover fixing plate 14 is provided with multiple insertion holes 14A for inserting bolts B3 (see Figure 3). By screwing the bolts B3 onto nuts N3 and tightening them, the lower end of the main body cover portion 20 is attached to the main body portion 10. The nuts N3 may be pre-fixed to the back of the cover fixing plate 14 by welding or the like, or they may be screwed onto the bolts B3 when inserting the bolts B3.

[0032] The main body 10 further includes a rear plate 15 that forms the rear surface of the wall railing 1, and an upper plate portion 16 that bends approximately at a right angle forward from the upper end of the rear plate 15.

[0033] The length (width) of the rear plate 15 in the left-right direction is approximately the same as the length of the base plate 11 in the left-right direction, and the length (height) of the rear plate 15 in the up-down direction is approximately the same as the length of the side plates 12 and 13 in the up-down direction. The rear plate 15 is fixed to the rear edges of the side plates 12 and 13 and the rear edges of the base plate 11 by welding or the like. Note that the fixing of these members 11, 12, 13, and 15 is not limited to welding, and they may also be fixed using fasteners such as bolts and nuts.

[0034] The length (width) of the upper plate portion 16 in the left-right direction is approximately the same as the length of the base plate 11 in the left-right direction, and the length (depth) of the upper plate portion 16 in the front-rear direction is approximately the same as the length of the side plates 12 and 13 in the front-rear direction. The upper plate portion 16 is fixed at both ends in the left-right direction to the upper edges of the side plates 12 and 13 by welding or the like. Note that the fixing of these members 12, 13 and 16 is not limited to welding, and may also be fixed using fasteners such as bolts and nuts.

[0035] The upper plate portion 16 is provided with multiple insertion holes 16A for inserting bolts B4 (see Figure 3). By screwing the bolts B4 onto the nuts N4 and tightening them, the upper end of the main body cover portion 20 is attached to the main body portion 10. The nuts N4 may be fixed to the lower surface of the upper plate portion 16 in advance by welding or the like, or they may be screwed onto the bolts B3 when inserting the bolts B4.

[0036] The main body cover section 20 has a front plate 21 that forms the front of the wall railing 1 and an upper plate 22 that forms the upper surface of the wall railing 1. The upper plate 22 bends at approximately a right angle from the upper end of the front plate 21 toward the rear. The length (width) of the upper plate 22 in the left-right direction is about the same as the length of the upper plate section 16 in the left-right direction, and the length (depth) of the upper plate 22 in the front-rear direction is about the same as the length of the upper plate section 16 in the front-rear direction. The upper plate 22 is provided with a plurality of insertion holes 22A for inserting bolts B4 (see Figure 3). The upper plate 22 is fixed by tightening the bolts B4 while it is superimposed on the upper surface of the upper plate section 16.

[0037] The width of the front plate 21 in the left-right direction is approximately the same as the width of the base plate 11 in the left-right direction, and the height of the front plate 21 in the up-down direction is approximately the same as the height of the side plates 12 and 13 in the up-down direction. Multiple insertion holes 21A for inserting bolts B3 (see Figure 3) are provided on the lower end of the front plate 21. The front plate 21 is fixed by tightening the bolts B3 while it is superimposed on the front surface of the cover fixing plate 14. Multiple engaging protrusions 23 are provided on a predetermined portion of the front plate 21 above the insertion holes 21A to hold the upper end of the ground cover portion 30.

[0038] The curb cover section 30 is equipped with an inclined plate 31 that forms an inclined surface at the boundary between the front surface of the wall railing 1 and the road surface. Approximately triangular side plates 35 are fixed to both the left and right ends of the inclined plate 31 by welding or other means, filling the gap with the base plate 11. The upper end back surface of the inclined plate 31 is provided with multiple engaging pieces 33 (see Figure 3) that engage with engaging projections 23. The lower end of the inclined plate 31 is provided with a mounting plate section 34 that is attached to the bracket 11B. The mounting plate section 34 is provided with multiple insertion holes 34A for inserting bolts B2. The cover section 30 is assembled to the main body section 10 by engaging the engaging pieces 33 with the engaging projections 23 and inserting the bolts B2 into the insertion holes 34A and screwing them into the nuts N2 on the back surface of the bracket 11B.

[0039] Multiple reinforcing ribs 40 are provided on the main body 10. The reinforcing ribs 40 are rectangular plates that are long in the vertical direction, and their length in the front-to-back direction (depth) and vertical direction (height) are approximately the same as that of the side plates 12 and 13. The multiple reinforcing ribs 40 are arranged in parallel at predetermined intervals in the left-to-right direction within the space defined by the base plate 11, the left side plate 12, the right side plate 13, the rear plate 15, the top plate portion 16, and the front plate 21. Preferably, the lower edge of the reinforcing rib 40 is fixed to the upper surface of the base plate 11, the rear edge to the front surface of the rear plate 15, and the upper edge to the lower surface of the top plate portion 16 by welding or the like. Note that the reinforcing rib 40 does not need to be fixed to all of the base plate 11, the rear plate 15, and the top plate portion 16; it is sufficient if it is fixed to any two of them.

[0040] The reinforcing rib 40 is a steel plate with a substantially L-shaped cross-section, and integrally comprises a rib body portion 41 extending in the front-rear direction and a flange portion 42 bending from the front end of the rib body portion 41 in the left-right direction. The front surface of the flange portion 41 supports the rear surface of the front plate 21 attached to the main body portion 10. As a result, for example, when a vehicle traveling on the bridge collides with the front plate 21, the impact of the collision can be absorbed by the front plate 21 and the flange portion 41 over a surface area, making it possible to effectively ensure the strength of the wall parapet 1.

[0041] The rib body portion 41 is provided with a pipe insertion hole 44 that penetrates the rib body portion 41 in the thickness direction. The pipe insertion hole 44 is an example of a rib hole in this disclosure. By providing the pipe insertion hole 44 in the rib body portion 41, the weight of the reinforcing rib 40 can be reduced. Details such as the specific shape and position of the pipe insertion hole 44 will be described later. A flexible pipe 80 (see Figures 4 and 5) is inserted into the pipe insertion hole 44 of the rib body portion 41. In addition, wiring for communication or power lines (including optical fibers) is inserted inside the flexible pipe 80. In other words, it is configured so that wiring and piping can be effectively accommodated in the internal space of the wall parapet 1.

[0042] Incidentally, expansion joints are provided at the connection points where bridge decks are joined together in the bridge axis direction to absorb girder movement and expansion. For this reason, wiring and piping housed within a pair of wall parapets spaced apart in the bridge axis direction on either side of the expansion joint must also be able to deform in accordance with the movement and expansion of the bridge. Figures 14 and 15 show conventional structures that accommodate such movement and expansion.

[0043] Figure 14 shows a conventional structure in which a pair of wall parapets 500 facing each other with an expansion joint 600 in between are connected by a pipe 700 that can expand and contract in the bridge axis direction, and wiring is inserted inside the pipe 700. The wall parapets 500 may be made of concrete or steel. In such a structure, the pipe 700 can expand and contract to follow fluctuations and expansions of the bridge in the bridge axis direction. However, if deformation or fluctuations occur in the bridge in a direction approximately perpendicular to the bridge axis direction, the pipe 700 cannot deform to follow, and there is a problem that the pipe 700 or the wiring inside the pipe 700 may be damaged.

[0044] Figure 15 shows a conventional structure in which a pair of wall parapets 500 facing each other with an expansion joint 600 in between are each provided with a pull box 550 on the back side, and the pull boxes 550 are connected to each other by a flexible pipe 710, with wiring inserted inside the flexible pipe 710. Similar to the example shown in Figure 14, the wall parapets 500 may be made of either concrete or steel. In such a structure, the flexible pipe 710 deforms to follow fluctuations and expansions in the bridge axis direction of the bridge, as well as fluctuations in a direction approximately perpendicular to the bridge axis direction, thus preventing damage.

[0045] However, if the pull box 550 is installed on the back of the wall parapet 500, maintenance of the wiring inside the pull box 550 requires the use of a high-altitude work vehicle, and if there are roads or structures accessible to third parties below the bridge, lane closures on the road on the bridge side are necessary, which presents challenges. Alternatively, it is conceivable to provide a separate inspection path on the outside of the bridge to access the pull box 550, but this presents challenges due to space constraints. Furthermore, if other roads or structures run parallel to the bridge and are adjacent to it, inspection from the back of the wall parapet 500 becomes difficult, which presents challenges. In addition, in snowy areas, there is a risk that snow or icicles on the top surface of the pull box 550 may fall downwards, necessitating safety measures for vehicles and people passing below the bridge. In other words, the conventional structure shown in Figure 15 has challenges such as poor maintainability and convenience.

[0046] Therefore, in the parapet wall 1 of this disclosure, the above-mentioned problems are solved by making improvements to the shape and arrangement of the pipe insertion holes 12B and 13B of the side plates 12 and 13 and the pipe insertion holes 44 of the reinforcing rib 40. In other words, the changes and expansions of the bridge are effectively absorbed while improving maintainability and convenience. The main parts of the parapet wall 1 of this embodiment will be described below.

[0047] [First Embodiment] Figure 4 is a schematic longitudinal cross-sectional view of the parapet 1A according to the first embodiment, cut in the direction of the bridge axis of the bridge. Figure 5 is a schematic straight view showing a pair of parapets 1A installed with an expansion joint 600 in between, and a precast concrete parapet 400 connected to the opposite side of these parapets 1A from the expansion joint 600.

[0048] As shown in Figure 4, in the first embodiment, the pipe insertion holes 12B and 13B provided in the side plates 12 and 13 of the wall railing 1A are elongated holes, and the pipe insertion hole 44 provided in the reinforcing rib 40 is either an elongated hole or a circular hole.

[0049] Specifically, the pipe insertion holes 12B and 13B in the side plates 12 and 13 are formed as elongated holes that extend vertically from the lower end to the upper end of the side plates 12 and 13, and the opening width in the short direction (front-to-back direction) perpendicular to the longitudinal direction is formed to be larger than the outer diameter of the flexible pipe 80.

[0050] In other words, multiple flexible pipes 80 are configured to be inserted into elongated pipe insertion holes 12B and 13B so as to be movable in the axial direction and vertical direction. The opening dimensions of the pipe insertion holes 12B and 13B are not particularly limited, but in this embodiment, the width in the short direction is approximately 10 cm and the width in the long direction is approximately 70 cm.

[0051] In the illustrated example, the insertion holes 12B in the left side plate 12 and 13B in the right side plate 13 are both shown as elongated holes. However, the pipe insertion holes 12B and 13B of the side plates 12 and 13 (in Figure 5, the left side wall railing 1A is the left side plate 12, and the right side wall railing 1 is the right side plate 13) that are in contact with the concrete wall railing 400 (see Figure 5) described later may be circular holes provided corresponding to the positions of the piping 420 in the wall railing 400.

[0052] The pipe insertion holes 44 of the reinforcing ribs 40 are either elongated or circular, depending on the position of the reinforcing ribs 40. In this embodiment, three reinforcing ribs 40 are arranged at predetermined intervals in the left-right direction. Therefore, below, the middle reinforcing rib of the three reinforcing ribs 40 will be referred to as the "middle reinforcing rib 40M", the left reinforcing rib as the "left reinforcing rib 40L", and the right reinforcing rib as the "right reinforcing rib 40R". Furthermore, the pipe insertion hole of the middle reinforcing rib 40M will be referred to as the "middle pipe insertion hole 44M", the insertion hole of the left reinforcing rib 40L as the "left pipe insertion hole 44L", and the insertion hole of the right reinforcing rib 40R as the "right pipe insertion hole 44R".

[0053] The left-side pipe insertion hole 44L is formed as an elongated hole extending vertically from the lower end to the upper end of the left-side reinforcing rib 40L, and the opening width in the short direction perpendicular to the longitudinal direction is larger than the outer diameter of the flexible pipe 80. Similarly, the right-side pipe insertion hole 44R is formed as an elongated hole extending vertically from the lower end to the upper end of the right-side reinforcing rib 40R, and the opening width in the short direction perpendicular to the longitudinal direction is larger than the outer diameter of the flexible pipe 80.

[0054] In other words, multiple flexible pipes 80 are configured to be inserted into the left pipe insertion hole 44L and the right pipe insertion hole 44R so as to be movable in the axial direction and vertical direction. The opening dimensions of these left pipe insertion holes 44L and the right pipe insertion hole 44R are not particularly limited, but in this embodiment, the width in the short direction is approximately 10 cm and the width in the long direction is approximately 70 cm.

[0055] The intermediate pipe insertion hole 44M is formed in the shape of a circular hole. Preferably, the intermediate pipe insertion hole 44M is provided in the upper part of the intermediate reinforcing rib 40M from the middle position in the vertical direction. In this embodiment, multiple intermediate pipe insertion holes 44M are provided according to the number of flexible pipes 80 (four in the illustrated example), and are arranged at predetermined intervals in the vertical direction. The opening diameter of the intermediate pipe insertion hole 44M is formed to be larger than the outer diameter of the flexible pipe 80, so that the flexible pipe 80 inserted into the intermediate pipe insertion hole 44M sits on the lower inner circumferential surface of the intermediate pipe insertion hole 44M by its own weight.

[0056] In other words, the intermediate pipe insertion hole 44M is configured to function as a support part that supports the flexible pipe 80 from below. The opening diameter of the intermediate pipe insertion hole 44M is not particularly limited, but in this embodiment it is about 7 to 8 cm. Also, the number of intermediate insertion holes 44M is not limited to multiple holes; if there is only one flexible pipe 80, there may be only one intermediate insertion hole 44M.

[0057] As shown in Figure 5, a pair of wall parapets 1A are installed facing each other, spaced apart in the bridge axis direction with an expansion joint 600 in between. Precast concrete wall parapets 400 are connected to the sides of these wall parapets 1A opposite to the expansion joint 600. The wall body 410 of the wall parapet 400 has a pipe 420 embedded in it for inserting wiring. Multiple pipes 420 are provided (four in the illustrated example) depending on the number of flexible pipes 80, and are arranged at predetermined intervals in the vertical direction. The wall body 410 is also provided with a connecting section 430 having a hole for inserting an arc-shaped connecting bolt (not shown) when connecting to another precast concrete wall parapet.

[0058] The piping 420 is embedded in the lower part of the wall body 410 below the connecting portion 430. In addition, multiple inserts 440 having female threaded holes are embedded in the wall body 410 on the wall railing 1A side. The inserts 440 are provided corresponding to the bolt insertion holes 12A and 13A (see Figure 2) of the side plates 12 and 13, and when connecting the wall railing 1A and the wall railing 400 to each other, the bolts B are inserted into the bolt insertion holes 12A and 13A and the bolts B are screwed into the female threaded holes of the inserts 440 to assemble them. At this time, the flexible pipe 80 of the wall railing 1A is connected to the end of the piping 420 inside the wall railing 400 via a connecting member or the like (not shown).

[0059] Here, the vertical positional relationship between the intermediate pipe insertion hole 44M and the pipe 420 is set such that the intermediate pipe insertion hole 44M is above the pipe 420. Specifically, the lowest intermediate pipe insertion hole 44M is positioned at least above the lowest pipe 420. The second-to-last intermediate pipe insertion hole 44M is positioned at least above the second-to-last pipe 420. The third-to-last intermediate pipe insertion hole 44M is positioned at least above the third-to-last pipe 420. The uppermost intermediate pipe insertion hole 44M is positioned above the uppermost pipe 420.

[0060] In this way, by positioning each intermediate pipe insertion hole 44M of the wall railing 1A above the corresponding piping 420 of the wall railing 400, the flexible pipe 80 is lifted upward as it moves from the wall railing 400 towards the intermediate reinforcing rib 40M. That is, the flexible pipe 80, which is stretched horizontally inside a pair of wall railings 1A facing each other on either side of the expansion joint 600, is supported in a state where it is lifted at two points by each intermediate pipe insertion hole 44M of the pair of wall railings 1A.

[0061] In this embodiment, the length in the axial direction (total length) of the flexible pipe 80, which is stretched inside the pair of wall railings 1A, is formed to be sufficiently longer than the distance D from the left end of the wall railing 1A located on the left to the right end of the wall railing 1A located on the right. By providing this extra length for the flexible pipe 80, the flexible pipe 80, which is lifted at two points on the left and right, will bend downward between those two points. Furthermore, the downward-bending portion of the flexible pipe 80 is movably inserted into the elongated pipe insertion holes 44R, 13B, 12B, and 44L.

[0062] In other words, even if the left and right wall parapets 1A are displaced relative to each other in the bridge axis direction or vertical direction due to the movement or expansion of the bridge, the flexible pipe 80 can deform to follow without interfering with the pipe insertion holes 44R, 13B, 12B, and 44L. As a result, the flexible pipe 80 can effectively absorb the movement and expansion of the bridge, and it is possible to effectively prevent damage to the flexible pipe 80, and furthermore, damage to the wiring inserted inside the flexible pipe 80.

[0063] Furthermore, by inserting flexible pipes 80 into the pipe insertion holes 44L, 44M, and 44R of the reinforcing ribs 40L, 40M, and 40R, the internal space of the wall parapet 1A can be effectively utilized as a space for accommodating wiring and piping, thereby significantly improving convenience.

[0064] Furthermore, since the wiring and piping housed within the wall parapet 1A can be easily accessed simply by removing the main body cover 20, maintenance work can be performed on the roadside. In other words, the aerial work platform required for maintenance in the conventional structure with a pull box attached to the rear of the wall parapet (see Figure 15) is no longer necessary, and maintenance work can be performed efficiently without lane closures on the road on the bridge.

[0065] Furthermore, since maintenance work can be easily performed on the shoulder of the road, work on the rear side of the wall parapet 1A becomes unnecessary. In other words, even if there are other roads running parallel to the bridge or other structures adjacent to the bridge, the wiring can be easily inspected and maintained without being affected by them, thereby significantly improving maintainability.

[0066] Furthermore, since the interior of the wall parapet 1A can be effectively utilized as space for wiring and piping, pull boxes attached to the rear of the wall parapet, as in conventional structures, become unnecessary. Moreover, piping connecting the pull boxes to each other on the outside of the bridge also becomes unnecessary. As a result, in snowy areas, risks such as falling snow from pull boxes and piping, as well as falling icicles, can be effectively avoided, and the safety of vehicles and people passing beneath the bridge can be effectively ensured.

[0067] Furthermore, among the multiple parapet walls connected in the bridge axis direction, the parapet walls installed at the ends require higher strength specifications in terms of connection strength with the deck slab and the strength of the wall itself compared to the other parapet walls installed at other points. If such parapet walls installed at the ends are made of steel parapet wall 1A of this disclosure, it becomes possible to easily meet the required specifications.

[0068] [Modified version of the first embodiment] As shown in Figure 6, the length of the wall parapet 1A in the left-right direction is relatively short, and there may be only one reinforcing rib 40. In such a case, the pipe insertion hole 44 of the single reinforcing rib 40 can be made into a circular hole. In the structure shown in Figure 6, by lifting and supporting the flexible pipe 80 through the pipe insertion hole 44, the flexible pipe 80 will bend downward between the pair of wall parapets 1A, making it possible to effectively absorb the movement and expansion and contraction of the bridge.

[0069] As shown in Figure 7, it is possible that the number of reinforcing ribs 40 is even rather than odd (four in the illustrated example). In such cases, if the number of reinforcing ribs 40 is four or more, the pipe insertion holes 44M1 and 44M2 of the two intermediate reinforcing ribs 40M1 and 40M2 should be circular holes. If the number of reinforcing ribs 40 is two, the pipe insertion hole 44 of either one of the reinforcing ribs 40 should be a circular hole. In this type of structure as well, the flexible pipe 80 will bend downward between the pair of wall parapets 1A, making it possible to effectively absorb the movement and expansion of the bridge.

[0070] As shown in Figure 8, the wall parapet 400 connected to the wall parapet 1A may be made of cast-in-place concrete instead of precast concrete. If the wall parapet 400 is made of cast-in-place concrete, the piping 420 can be embedded above the wall body 410. In this case, the pipe insertion holes 12B and 13B of the side plates 12 and 13 connected to the wall parapet 400 may be circular holes corresponding to the position of the piping 420, while the other pipe insertion holes 44L, 44M, 44R, 12B, and 13B may all be elongated holes. In the structure shown in Figure 8, the flexible pipe 80 connected to the piping 420 will bend downward between the pair of wall parapets 1A, making it possible to effectively absorb the movement and expansion of the bridge.

[0071] [Second Embodiment] Next, the details of the wall parapets 1B, 1C, and 1D according to the second embodiment will be described based on Figures 9 to 12. Figure 9 is a perspective view showing the wall parapet 1B according to the second embodiment with the main body cover 20 and the curb cover 30 removed from the main body 10. Figure 10 is a perspective view showing the wall parapet 1C connected to the wall parapet 1B shown in Figure 9 with the main body cover 20 removed. Figure 11 is a perspective view showing the wall parapet 1D connected to the wall parapet 1C shown in Figure 10 with the main body cover 20 removed. Figure 11 is a schematic straight view showing the wall parapets 1B, 1C, and 1D according to the second embodiment connected in the bridge axis direction.

[0072] In the second embodiment, the wall railings 1B, 1C, and 1D are all made of steel. The basic structure of the main body 10, the main body cover 20, and the curb cover 30 is configured substantially the same as that of the wall railing 1A in the first embodiment, so a detailed explanation of them is omitted. Also, the curb cover 30 is not shown in Figures 10 and 11.

[0073] As shown in Figure 9, in the wall parapet 1B of the second embodiment, the pipe insertion holes 12B and 13B provided in the side plates 12 and 13, and the pipe insertion holes 44L, 44M, and 44R provided in the reinforcing ribs 40L, 40M, and 40R are all elongated holes. That is, multiple flexible pipes 80 (see Figure 12) are configured to be inserted into all pipe insertion holes 12B, 13B, 44L, 44M, and 44R so as to be movable in the axial direction and vertical direction. The side plates 12 and 13 of the wall parapet 1B are provided with bolt insertion holes 12A and 13A for inserting bolts when connecting to other wall parapets, similar to the wall parapet 1A of the first embodiment.

[0074] The wall railing 1C shown in Figure 10 is an example of the second wall railing of this disclosure, and its length in the left-right direction is longer than that of the wall railing 1B shown in Figure 9. The wall railing 1C is equipped with a larger number of reinforcing ribs 40C than the wall railing 1B. Specifically, five reinforcing ribs 40C are arranged at predetermined intervals in the left-right direction inside the main body portion 10 of the wall railing 1C. The number of reinforcing ribs 40C is not limited to this, and can be set to an appropriate number according to the specific dimensions of the wall railing 1C, such as its left-right length.

[0075] Inside the main body 10 of the wall railing 1C, a handhole 70 is provided, which functions as a workspace for performing tasks such as wiring inspection. The handhole 70 is an example of the box body of this disclosure.

[0076] The handhole 70 is formed in a roughly box-like shape that opens to the front side of the wall railing 1C by welding together metal plates such as steel plates. Specifically, the handhole 70 has a rectangular plate-shaped rear side plate 71 that forms the back surface, a rectangular plate-shaped left side plate 72 that forms the left side surface, a rectangular plate-shaped right side plate 73 that forms the right side surface, a rectangular plate-shaped upper side plate 74 that forms the top surface, and a rectangular plate-shaped lower side plate 75 that forms the bottom surface. A removable cover material 76 is attached to the part of the main body cover 20 that corresponds to the opening of the handhole 70. By removing the cover material 76 from the main body cover 20, it is possible to easily perform inspection work on the wiring inside the handhole 70.

[0077] The handhole 70 is installed by fitting it into a portion of the reinforcing rib 40C that has been cut out in a roughly U-shape (a roughly U-shape with right angles at the corners). The rear plate 71, left plate 72, right plate 73, upper plate 74, and lower plate 75 of the handhole 70 are preferably fixed by joining them to the edge of the cut-out portion of the reinforcing rib 40C by welding or the like, so as to maintain the strength of the reinforcing rib 40C. In the wall railing 1C, the handhole 70 is provided in the portion of the reinforcing rib 40C from approximately the middle position in the vertical direction downwards.

[0078] The portion of the reinforcing rib 40C above the handhole 70 is provided with a pipe insertion hole 44C for inserting a flexible pipe 80 (see Figure 12). The pipe insertion hole 44C is formed in a circular shape and supports the flexible pipe 80 so as to span it in the left-right direction (approximately horizontal direction) within the space above the handhole 70 of the wall railing 1C.

[0079] The left and right plates 72 and 73 of the handhole 70 are also provided with circular pipe insertion holes 72A and 73A, respectively, for inserting the flexible pipe 80. In the wall railing 1C, the pipe insertion hole 73A of the right plate 73 is positioned above the pipe insertion hole 72A of the left plate 72. That is, within the space of the handhole 70, the flexible pipe 80 is lifted upward as it moves from the left plate 72 to the right plate 73. Note that the vertical positional relationship of the pipe insertion holes 72A and 73A can be changed if the wall railing 1B is connected to the left side of the wall railing 1C, by swapping the positions so that the pipe insertion hole 72A of the left plate 72 is positioned above the pipe insertion hole 73A of the right plate 73.

[0080] The side plates 12 and 13 of the wall railing 1C are provided with bolt insertion holes 12A and 13A, respectively, for inserting bolts when connecting to other wall railings, similar to wall railing 1B.

[0081] The wall railing 1D shown in Figure 11 is formed with a length in the left-right direction equivalent to that of the wall railing 1C shown in Figure 10, and is equipped with five reinforcing ribs 40D, similar to the wall railing 1C. However, the number of reinforcing ribs 40D is not limited to this and can be set to an appropriate number according to the specific dimensions of the wall railing 1D, such as its left-right length.

[0082] A handhole 70 is provided inside the main body 10 of the wall parapet 1D. The handhole 70 of the wall parapet 1D is configured in the same way as the handhole 70 of the wall parapet 1C described above, so a detailed explanation is omitted. In the wall parapet 1D, the handhole 70 is provided in the upper part from approximately the midpoint in the vertical direction of the reinforcing rib 40D.

[0083] A circular pipe insertion hole 44D is provided in the portion of the reinforcing rib 40D below the handhole 70 for inserting the flexible pipe 80. The pipe insertion hole 44D supports the flexible pipe 80 (see Figure 12) so as to span it in the left-right direction (approximately horizontal direction) within the space below the handhole 70 of the wall railing 1D.

[0084] The left side plate 72 and the right side plate 73 of the handhole 70 are also provided with circular pipe insertion holes 72A and 73A, respectively, for inserting the flexible pipe 80. In the wall railing 1D, the pipe insertion hole 73A of the right side plate 73 is positioned higher than the pipe insertion hole 72A of the left side plate 72. In other words, within the space of the handhole 70, the flexible pipe 80 is lifted upward as it moves from the left side plate 72 to the right side plate 73.

[0085] As shown in Figure 12, a pair of wall parapets 1B are installed facing each other, spaced apart in the bridge axis direction with an expansion joint 600 in between. Wall parapets 1C are connected to the sides of these wall parapets 1B that are opposite the expansion joint 600. In addition, wall parapet 1D is connected to the side of wall parapet 1C that is opposite to wall parapet 1B.

[0086] Within the wall railing 1D, the upper flexible pipes 80 (the two upper pipes in the illustrated example) of the multiple flexible pipes 80 are lifted upward as they approach the wall railing 1C by pipe insertion holes 72A and 73A of the handhole 70 provided within the wall railing 1D. The flexible pipes 80 lifted within the wall railing 1D are inserted into pipe insertion holes 44C of the reinforcing rib 40C within the wall railing 1C, thereby spanning the space above the handhole 70 of the wall railing 1C in the left-right direction.

[0087] Furthermore, the flexible pipes 80 (two lower pipes in the illustrated example) that are stretched horizontally across the space below the handhole 70 of the wall railing 1D are lifted upward as they approach the wall railing 1B by the pipe insertion holes 72A and 73A of the handhole 70 provided within the wall railing 1C.

[0088] In other words, multiple flexible pipes 80 housed inside the wall railings 1D and 1C are configured to be lifted upward as they move toward the wall railing 1B by pipe insertion holes 72A and 73A of handholes 70 provided inside the wall railings 1D and 1C. The flexible pipes 80 lifted by the pipe insertion holes 72A and 73A of the handholes 70 are supported in an upward-lifted state by pipe insertion holes 12B and 13B of the side plates 12 and 13 of the wall railing 1C that are in contact with the wall railing 1B (in the figure, the left wall railing 1C has the pipe insertion hole 13B of the right side plate 13, and in the figure, the right wall railing 1C has the pipe insertion hole 12B of the left side plate 12).

[0089] In this embodiment, the pipe insertion holes 12B, 13B and 44L, 44M, 44R of the wall parapet 1B are all formed as elongated holes into which the flexible pipe 80 can be movably inserted. Therefore, the flexible pipe 80 supported in the pipe insertion holes 12B, 13B of the wall parapet 1C is in a state of downward bending inside the pair of wall parapets 1A facing each other with the expansion joint 600 in between. By supporting the flexible pipe 80 in this downward bending state, even if the left and right wall parapets 1B are displaced relative to each other in the bridge axis direction or vertical direction due to the movement or expansion of the bridge, the flexible pipe 80 can effectively absorb the movement and expansion of the bridge, and damage to the flexible pipe 80, as well as damage to the wiring inserted inside the flexible pipe 80, can be effectively prevented.

[0090] Furthermore, with respect to the wall railing 1B, the wiring can be easily accessed simply by removing the main body cover 20, and with respect to the wall railings 1C and 1D, the wiring can be easily accessed simply by removing the cover material 76. As a result, as with the first embodiment, inspection and maintenance of the wiring can be performed at the roadside, thereby significantly improving maintainability. Also, as with the first embodiment, since a pull box is not required, risks from falling snow and icicles can be avoided, thereby significantly improving safety.

[0091] [others] Furthermore, this disclosure is not limited to the embodiments described above, and can be modified and implemented as appropriate without departing from the spirit of this disclosure.

[0092] For example, as shown in Figure 13, the handhole 70 of the second embodiment can also be applied to the wall railing 1A of the first embodiment. In this case, the flexible pipe 80 can be supported by being lifted upward by the pipe insertion holes 72A and 73A provided in the side plates 72 and 73 of the handhole 70.

[0093] Furthermore, although the first embodiment described a concrete wall parapet being connected to a steel wall parapet 1A, it is also possible to connect the wall parapets 1C and 1D of the second embodiment to wall parapet 1A. In addition, the wall parapets 1C and 1D of the second embodiment can be used in combination with concrete wall parapets (for example, arranged alternately). By using the wall parapets 1C and 1D of the second embodiment in combination with concrete wall parapets, the weight can be effectively reduced compared to using only concrete, and the cost can be reduced compared to using only steel.

[0094] Furthermore, in the above embodiment, the wiring is housed within the wall parapet 1A to 1D by inserting it into a flexible pipe 80, but it is also possible to house the wiring itself directly without using the flexible pipe 80. In addition, the wall parapets 1A to 1D of this disclosure can be widely applied to wall parapets installed in locations other than the sides of bridges, such as median strips separating the upper and lower lanes of a road. [Explanation of symbols]

[0095] 1...Wall railing, 10...Main body, 11...Base plate, 12...Left side plate, 13...Right side plate, 12B, 13B...Pipe insertion hole, 14...Cover fixing plate, 15...Rear plate, 16...Top plate, 20...Main body cover, 21...Front plate, 22...Top plate, 30...Ground cover, 40...Reinforcement rib, 44...Pipe insertion hole, 80...Flexible pipe, 600...Expansion joint

Claims

1. A steel wall railing installed on a bridge, The aforementioned bridge is formed in a hollow box shape having a pair of left and right side plates that are spaced apart and facing each other in the bridge axis direction, and has a wall body capable of accommodating a linear body inside, The wall body has plate-shaped reinforcing ribs that extend vertically inside, The side plate has a side hole that penetrates in the thickness direction and into which the linear body can be inserted, The reinforcing rib penetrates in the thickness direction of the plate and is provided with a rib hole into which the linear body can be inserted, At least one or both of the side holes and the rib holes are formed in the shape of elongated holes that are long in the vertical direction. The aforementioned side holes are formed in the elongated shape, The rib holes are formed in a circular shape and are provided in the upper portion of the reinforcing rib, from the midpoint in the vertical direction. The linear body, which is inserted into the side hole and housed inside the wall body, is lifted upward and supported by the rib hole. A wall railing characterized by the following features.

2. It is equipped with multiple reinforcing ribs, Of the multiple reinforcing ribs, at least one reinforcing rib has a circular hole, while the rib holes of the other reinforcing ribs are formed in the elongated shape. The linear body inserted into the elongated side holes and the elongated rib holes is lifted upward and supported by the circular rib holes. The wall railing according to claim 1.

3. The wall body faces the road side of the bridge and has a front plate that is detachably attached to the wall body. The wall railing according to claim 1 or 2.

4. The box is formed in the shape of a hollow box having a pair of left and right side plates that are spaced apart and facing each other in the direction of the bridge axis, and is fitted and fixed into the cut-out portion of the reinforcing rib, and has a box body inside that can accommodate the linear body, The side plate has a circular hole-shaped side plate hole that penetrates the plate thickness direction and into which the linear body can be inserted, Of the side plate holes provided in the pair of left and right side plates, one side plate hole is located above the other side plate hole. The linear body housed inside the box is lifted upward as it moves from the other side plate hole toward the one side plate hole. The wall railing according to claim 1 or 2.

5. A wall railing installation structure according to claim 1 or 2, The pair of railings are spaced apart in the bridge axis direction, with an expansion joint connecting the deck slabs of the bridge in between, and the linear body is inserted into the side holes of the pair of railings, thereby housing the linear body within the wall body of the pair of railings. By lifting and supporting the linear body upward within the wall body of the pair, the linear body is bent downward between the wall body of the pair. A wall railing installation structure characterized by the following features.

6. A steel second wall parapet connected in the bridge axis direction to the wall parapet according to claim 1 or 2, It is formed in a hollow box shape having a pair of left and right second side plates that are spaced apart and facing each other in the direction of the bridge axis, and a second wall body capable of accommodating the linear body, The second side plate has a second side hole that penetrates in the thickness direction and into which the linear body can be inserted, The second reinforcing rib is a plate-shaped rib that extends vertically inside the second wall body, The second box is formed in the shape of a hollow box having a pair of left and right second side plates that are spaced apart and facing each other in the direction of the bridge axis, and is fitted and fixed into the cut-out portion of the second reinforcing rib, and has a second box body inside that can accommodate the linear body, The second side plate is provided with a hole in the second side plate that penetrates the plate thickness direction and into which the linear body can be inserted, Of the second side plate holes provided in the pair of left and right second side plates, when the second wall railing is connected to the wall railing, one of the second side plate holes closer to the wall railing is located higher than the other second side plate hole. The linear body housed inside the second box is lifted upward as it moves from the other second side plate hole toward the first second side plate hole. A second wall railing characterized by the following features.

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