Wall balustrade and wall balustrade installation structure

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 parapet and a wall parapet installation structure, and in particular to a technique suitable for installing a steel wall parapet. [Background technology]

[0002] Generally, a wall parapet that functions as a protective fence is provided on the side of a bridge such as an elevated expressway. Such wall parapets may house linear objects such as electric wires, communication wiring, and piping for inserting the wiring. For example, Patent Document 1 discloses a technology in which wiring is housed inside the capping of a parapet installed on a bridge, connectors are provided on both ends of the wiring, and when multiple parapets are connected in the bridge axis direction, the connectors are connected to each other, eliminating the need for electrical work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility model registration No. 3124041 Summary of the Invention [Problem to be solved by the invention]

[0004] The joints that connect the bridge decks in the bridge axis direction are equipped with expansion devices to absorb girder deformation and expansion / contraction caused by temperature changes, earthquakes, and the passage of vehicles, etc. Furthermore, at the bridge joints, a pair of balustrades are installed at intervals in the bridge axis direction, sandwiching an expansion device between them. When wiring and piping are housed inside such balustrades, the wiring and piping need to be structured in a way that allows them to absorb bridge deformation and expansion / contraction at the joints.

[0005] In the technology described in Patent Document 1, the wiring is routed in a substantially straight line inside the fascia and is connected to each other by connectors, so there is a risk that the wiring and connectors will not be able to absorb the movement and expansion and contraction of the bridge and may be damaged.

[0006] One possible structure to absorb the deformation and expansion of the bridge is to connect the two wall parapets separated by an expansion device with piping that can expand and contract in the bridge axis direction, and to insert wiring inside the piping. However, with piping that can expand and contract only in the bridge axis direction, there is a problem that the piping cannot follow the deformation when vibrations are applied in the vertical direction or in the direction perpendicular to the bridge axis direction due to earthquakes, etc., and this can lead to damage to the piping.

[0007] In order to deal with such vibrations in the vertical direction and in the direction perpendicular to the bridge axis, a structure in which pull boxes are installed on the back of the wall parapets, the pull boxes are connected to each other by flexible pipes, and wiring is inserted into the flexible pipes can be considered. However, when the pull boxes are installed on the back of the wall parapets, during maintenance, it is necessary to access the pull boxes using an aerial work vehicle from the road side of the bridge, or to install a separate inspection path outside the bridge to access the pull boxes, which leads to problems such as poor maintainability. In addition, in snowy areas, there is a risk that snow and icicles on the top of the pull boxes will fall downward, which requires safety measures for vehicles and people passing under the bridge.

[0008] The technology disclosed herein has been made in consideration of the above-mentioned circumstances, and aims to effectively improve maintainability of wall parapets while effectively absorbing bridge girder movements and expansion and contraction. [Means for solving the problem]

[0009] The wall balustrade of the present disclosure is: A steel wall parapet (1A, 1B) installed on a bridge, a wall body (10) formed in a hollow box shape having a pair of left and right side plates (12, 13) facing each other and spaced apart in the bridge axis direction of the bridge, and capable of accommodating a linear body (80) therein; a plate-shaped reinforcing rib (40) extending vertically inside the wall body (10); a side hole (12B, 13B) penetrating the side plate (12, 13) in a plate thickness direction and into which the linear body (80) can be inserted; a rib hole (44) penetrating the reinforcing rib (40) in a plate thickness direction and into which the linear body (80) can be inserted, At least one or both of the side hole (12B, 13B) and the rib hole (44) are formed in an elongated hole shape that is long in the vertical direction.

[0010] In another aspect of the wall balustrade of the present disclosure, The side hole (12B, 13B) is formed in the shape of an elongated hole, The rib hole (44) is formed in a circular hole shape and is provided in a portion above the central position of the reinforcing rib (40) in the up-down direction, It is preferable that the linear body (80) inserted into the side hole (12B, 13B) and accommodated inside the wall body (10) is lifted upward and supported by the rib hole (44).

[0011] In another aspect of the wall balustrade of the present disclosure, The reinforcing rib (40) is provided in a plurality of pieces, Among the plurality of reinforcing ribs (40), the rib hole (44M) of at least one reinforcing rib (40M) is formed in a circular hole shape, and the rib holes (44L, 44R) of the other reinforcing ribs (40L, 40R) are formed in the elongated hole shape, It is preferable that the linear body (80) inserted into the side holes (12B, 13B) formed in the elongated hole shape and the rib holes (44L, 44R) formed in the elongated hole shape is lifted upward and supported by the rib hole (44M) formed in the circular hole shape.

[0012] In another aspect of the wall balustrade of the present disclosure, It is preferable that 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 another aspect of the wall balustrade of the present disclosure, a box body (70) formed in a hollow box shape having a pair of left and right side plates (72, 73) opposed to each other and spaced apart in the bridge axis direction, the reinforcing rib (40) being fitted and fixed to a cut-out portion, and capable of accommodating the linear body (80) therein; a side plate hole (72A, 73A) having a circular hole shape that penetrates the side plate (72, 73) in a plate thickness direction and into which the linear body (80) can be inserted; one of the side plate holes (72A, 73A) provided in each of the pair of side plates (72, 73) is located higher than the other side plate hole (72A); It is preferable that the linear body (80) contained inside the box body (70) is lifted upward as it moves from the other side plate hole (72A) toward the one side plate hole (73A).

[0014] The wall railing installation structure of the present disclosure is: The pair of wall balustrades (1A, 1B) are spaced apart in the bridge axis direction across an expansion device (600) that connects the deck slabs of the bridge, and the linear body (80) is inserted into the side holes (12B, 13B) of the pair of wall balustrades (1A, 1B) so that the linear body (80) is accommodated in each of the wall main bodies (10) of the pair of wall balustrades (1A, 1B), and the linear body (80) is lifted upward and supported within the pair of wall main bodies (10), thereby bending the linear body (80) downward between the pair of wall main bodies (10).

[0015] Another aspect of the present disclosure is a steel second wall railing (1C) connected to the wall railing (1A, 1B) in the bridge axis direction, a second wall body (10) formed in a hollow box shape having a pair of left and right second side plates (12, 13) facing each other and spaced apart in the bridge axis direction, and capable of accommodating the linear body (80); a second side hole (12B, 13B) penetrating the second side plate (12, 13) in a plate thickness direction and into which the linear object can be inserted; a plate-shaped second reinforcing rib (40C) extending vertically inside the second wall body (10); a second box body (70) formed in a hollow box shape having a pair of left and right second side plates (72, 73) facing each other and spaced apart in the bridge axis direction, the second reinforcing rib (40C) being fitted and fixed to a cut-out portion, and capable of accommodating the linear body (80) therein; a second side plate hole (72A, 73A) penetrating the second side plate (72, 73) in a plate thickness direction and into which the linear body (80) can be inserted, of the second side plate holes (72A, 73A) provided in the pair of second side plates (72, 73), respectively, when the second wall balustrade (1C) is connected to the wall balustrade (1A, 1B), one of the second side plate holes (73A) closer to the wall balustrade (1A, 1B) is located higher than the other second side plate hole (72A), The linear body (80) housed inside the second box body (70) is lifted upward as it moves from the other second side plate hole (72A) toward the one second side plate hole (73A).

[0016] In the above description, in order to facilitate understanding of the invention, the reference symbols used in the embodiments are added in parentheses to the constituent elements of the invention corresponding to the embodiments, but the constituent elements of the invention are not limited to the embodiments defined by the reference symbols. In addition, the wall parapet of the present disclosure can also be applied to the wall parapet of the median strip that separates the upper and lower lanes of a road. Effect of the Invention

[0017] According to the technology disclosed herein, it is possible to effectively improve maintainability of wall parapets while effectively absorbing the movement and expansion and contraction of bridge girders. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic perspective view showing a wall balustrade according to the present embodiment. [Diagram 2] FIG. 2 is a schematic exploded perspective view of the wall balustrade shown in FIG. 1. [Diagram 3]1 is a schematic longitudinal cross-sectional view of a wall parapet according to this embodiment, cut in the road width direction of a bridge. FIG. [Figure 4] 1 is a schematic longitudinal cross-sectional view of a wall parapet in accordance with a first embodiment, cut in the bridge axis direction of a bridge. FIG. [Diagram 5] FIG. 2 is a schematic front view illustrating the installation structure of the wall railing in the first embodiment. [Figure 6] FIG. 13 is a schematic perspective view showing a modified wall balustrade. [Figure 7] FIG. 13 is a schematic perspective view showing a modified wall balustrade. [Figure 8] FIG. 13 is a schematic front view showing a modified wall balustrade. [Figure 9] FIG. 11 is a schematic exploded perspective view of a wall balustrade according to a second embodiment. [Figure 10] FIG. 11 is a schematic exploded perspective view of a wall balustrade according to a second embodiment. [Figure 11] FIG. 11 is a schematic exploded perspective view of a wall balustrade according to a second embodiment. [Figure 12] A schematic front view illustrating the installation structure of the wall railing in the second embodiment. [Figure 13] FIG. 13 is a schematic front view showing a modified wall balustrade. [Figure 14] FIG. 1 is a schematic diagram illustrating a conventional structure. [Figure 15] FIG. 1 is a schematic diagram illustrating a conventional structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the wall balustrade and the installation structure of the wall balustrade according to the present embodiment will be described with reference to the accompanying drawings. The same parts are given the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[0020] [Overall configuration] Fig. 1 is a schematic perspective view showing a wall balustrade 1 according to this embodiment, and Fig. 2 is an exploded perspective view of the wall balustrade 1 shown in Fig. 1. Fig. 3 is a schematic vertical cross-sectional view of the wall balustrade 1 according to this embodiment.

[0021] The wall railing 1 shown in Figures 1 and 2 is a steel wall railing constructed by assembling multiple steel materials. Steel wall railings do not require the steps of assembling formwork, assembling rebar, pouring concrete, etc., which are required for the installation of cast-in-place concrete wall railings, and have the advantage of being able to significantly shorten the construction period. In addition, because steel wall railings have a hollow structure, they have the advantage of being significantly lighter in weight than cast-in-place concrete or precast concrete wall railings, and therefore also of being able to reduce the load on the bridge.

[0022] 1 and 2, the wall parapet 1 includes a main body portion 10, a main body cover portion 20, and a ground cover portion 30. The main body portion 10 and the main body cover portion 20 constitute the wall main body of the present disclosure. Each of the main body portion 10, the main body cover portion 20, and the ground cover portion 30 is formed by bending or welding a metal plate material such as a steel plate.

[0023] In the following, the up-down direction when the parapet 1 is installed on the side of a bridge is referred to as the "up-down direction" of the parapet 1. Additionally, the bridge axis direction of the bridge is referred to as the "left-right direction" of the parapet 1, and the horizontal direction perpendicular to the bridge axis direction is referred to as the "front-to-back direction" of the parapet 1. For this reason, in the following explanation, of the sides of the parapet 1, the face facing the road side of the bridge is referred to as the "front" of the parapet 1, the face opposite the road is referred to as the "rear" of the parapet 1, the left end face as viewed from the road side is referred to as the "left side" of the parapet 1, and the right end face as viewed from the road side is referred to as the "right side" of the parapet 1.

[0024] The main body 10 includes a base plate 11 that constitutes the bottom of the balustrade 1. The base plate 11 is formed in a rectangular plate shape that is long in the left-right direction. The dimensions of the base plate 11 are not particularly limited, but may be set based on the dimensions of the bottom of a standard balustrade. 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-rear direction is, for example, 40 cm to 50 cm.

[0025] The base plate 11 is provided with a plurality of insertion holes 11A (see FIG. 3) penetrating the base plate 11 in the plate thickness direction. The positions and number of the insertion holes 11A are not particularly limited, but can be set appropriately according to the positions and number of stud bolts B1 (or anchor bolts) protruding upward from the deck FS. When installing the wall balustrade 1 on the deck FS, the stud bolts B1 are inserted into the insertion holes 11A, and nuts N1 are screwed onto the stud bolts B1 to tighten them. At this time, mortar (not shown) may be laid between the deck FS and the base plate 11.

[0026] A plurality of brackets 11B are provided at the front end of the base plate 11 at a predetermined interval in the left-right direction. The brackets 11B are preferably fixed to the upper surface of the base plate 11 by welding or the like. The fixing of the brackets 11B is not limited to welding, and may be fixed using fasteners such as bolts and nuts. The brackets 11B are provided with insertion holes 11C for inserting bolts B2 (see FIG. 3). The lower end side of the ground cover part 30 is attached to the bracket 11B by screwing and tightening the bolts B2 into the nuts N2. The nuts N2 may be fixed to the back surface of the bracket 11B in advance by welding or the like, or may be screwed into the bolts B2 when the bolts B2 are inserted. If the wall balustrade 1 does not require the ground cover part 30, the brackets 11B may be omitted.

[0027] The main body 10 further includes a left side plate 12 that forms the left surface of the balustrade 1, and a right side plate 13 that forms the right surface of the balustrade 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. In other words, the left side plate 12 and the right side plate 13 face each other with a space between them in the left-right direction, sandwiching the base plate 11 therebetween. In the following, the left side plate 12 and the right side plate 13 will also be simply referred to as the "side plates 12, 13" unless there is a particular need to distinguish between them.

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

[0029] The side plates 12, 13 are fixed to the upper surface of the base plate 11 by welding or the like so that the rear end of the lower edge portion is approximately aligned with the rear corner portion of the base plate 11. The fixing of the side plates 12, 13 is not limited to welding, and they can also be fixed using fasteners such as bolts and nuts. The side plates 12, 13 are formed with a plurality of bolt insertion holes 12A, 13A penetrating in the plate thickness direction for inserting bolts when connecting to another wall balustrade. The side plates 12, 13 are also provided with pipe insertion holes 12B, 13B for inserting a flexible pipe 80 (see Figs. 4 and 5) described later. The pipe insertion holes 12B, 13B are an example of a side hole of the present disclosure. The details of the pipe insertion holes 12B, 13B will be described later.

[0030] The main body 10 further includes a cover fixing plate 14 for mounting the lower end side of the main body cover 20. The cover fixing plate 14 is fixed to the lower portion of the front edge of the side plates 12, 13 and to the upper surface of the base plate 11 by welding or the like. 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, 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 the length necessary to fix the main body cover 20.

[0031] The cover fixing plate 14 is provided with a plurality of insertion holes 14A for inserting bolts B3 (see FIG. 3). The lower end side of the main body cover part 20 is attached to the main body part 10 by screwing and tightening the bolts B3 into nuts N3. The nuts N3 may be fixed in advance to the back surface of the cover fixing plate 14 by welding or the like, or may be screwed onto the bolts B3 when the bolts B3 are inserted.

[0032] The main body 10 further includes a rear plate 15 that forms the rear surface of the wall balustrade 1, and an upper plate 16 that is bent forward at approximately a right angle 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, 13 in the up-down direction. The rear plate 15 is fixed to the rear edges of the side plates 12, 13 and the rear edge of the base plate 11 by welding or the like. Note that the fixing of these members 11, 12, 13, 15 is not limited to welding, and they may 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, 13 in the front-rear direction. Both ends of the upper plate portion 16 in the left-right direction are fixed to the upper edge portions of the side plates 12, 13 by welding or the like. Note that the fixing of these members 12, 13, 16 is not limited to welding, and they may be fixed using fasteners such as bolts and nuts.

[0035] The upper plate portion 16 is provided with a plurality of insertion holes 16A for inserting bolts B4 (see FIG. 3). The upper end side of the body cover portion 20 is attached to the main body portion 10 by screwing and fastening the bolts B4 into nuts N4. The nuts N4 may be fixed to the lower surface of the upper plate portion 16 in advance by welding or the like, or may be screwed into the bolts B3 when the bolts B4 are inserted.

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

[0037] The length (width) of the front plate 21 in the left-right direction is approximately the same as that of the base plate 11 in the left-right direction, and the length (height) of the front plate 21 in the up-down direction is approximately the same as that of the side plates 12, 13 in the up-down direction. A plurality of insertion holes 21A for inserting bolts B3 (see FIG. 3) are provided on the lower end side of the front plate 21. The front plate 21 is fixed by tightening the bolts B3 in a state where it is overlapped on the front surface of the cover fixing plate 14. A plurality of engagement protrusions 23 for holding the upper end side of the ground covering part 30 are provided on a predetermined portion of the front plate 21 above the insertion holes 21A.

[0038] The ground cover part 30 is provided with an inclined plate 31 that forms an inclined surface at the boundary between the front surface of the wall balustrade 1 and the road surface. On both the left and right ends of the inclined plate 31, approximately triangular side plates 35 that fill the gap with the base plate 11 are fixed by welding or the like. On the back surface of the upper end of the inclined plate 31, a plurality of engaged pieces 33 (see FIG. 3) that engage with the engaging protrusions 23 are provided. Also, on the lower end side of the inclined plate 31, a mounting plate part 34 that is attached to the bracket 11B is provided. The mounting plate part 34 is provided with a plurality of insertion holes 34A for inserting the bolts B2. The cover part 30 is assembled to the main body part 10 by engaging the engaged pieces 33 with the engaging protrusions 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] The main body 10 is provided with a plurality of reinforcing ribs 40. The reinforcing rib 40 is a rectangular plate that is long in the vertical direction, and the length in the front-rear direction (depth) and the length in the vertical direction (height) are formed to be approximately the same as those of the side plates 12 and 13. The reinforcing ribs 40 are arranged in parallel at a predetermined interval in the left-right direction in a space defined by the base plate 11, the left side plate 12, the right side plate 13, the rear plate 15, the upper plate 16, and the front plate 21. The reinforcing rib 40 is preferably fixed by welding or the like at its lower edge to the upper surface of the base plate 11, its rear edge to the front surface of the rear plate 15, and its upper edge to the lower surface of the upper plate 16. It is not necessary for the reinforcing rib 40 to be fixed to all of the base plate 11, the rear plate 15, and the upper plate 16, but it is sufficient if it is fixed to any two of them.

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

[0041] The rib main body 41 is provided with a pipe insertion hole 44 penetrating the rib main body 41 in the plate thickness direction. The pipe insertion hole 44 is an example of a rib hole of the present disclosure. By providing the rib main body 41 with the pipe insertion hole 44, the weight of the reinforcing rib 40 can be reduced. Details such as the specific shape and arrangement position of the pipe insertion hole 44 will be described later. A flexible pipe 80 (see Figs. 4 and 5) is inserted into the pipe insertion hole 44 of the rib main body 41. Furthermore, wiring (including optical fibers) for communication or electric wires 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 balustrade 1.

[0042] Incidentally, the joints that connect the decks of a bridge in the bridge axis direction are equipped with expansion devices to absorb the deformation and expansion of the girders. For this reason, the wiring and piping housed within a pair of wall parapets that are separated in the bridge axis direction on either side of the expansion device must also be able to deform in response to the deformation and expansion of the bridge. Figures 14 and 15 show a conventional structure that can accommodate such deformation and expansion.

[0043] 14 shows a conventional structure in which a pair of balustrades 500 facing each other across an expansion device 600 are connected by piping 700 that is expandable in the bridge axis direction, and wiring is inserted inside the piping 700. The balustrade 500 may be made of either concrete or steel. In such a structure, the piping 700 can expand and contract in response to the deformation or expansion of the bridge in the bridge axis direction. However, when deformation or deformation occurs in the bridge in a direction approximately perpendicular to the bridge axis direction, the piping 700 cannot deform and there is a problem that the piping 700 or the wiring inside the piping 700 may be damaged.

[0044] Fig. 15 shows a conventional structure in which a pull box 550 is provided on the back side of a pair of wall balustrades 500 that face each other across an expansion device 600, and the pull boxes 550 are connected to each other by a flexible pipe 710, with wiring inserted inside the flexible pipe 710. As with the example shown in Fig. 14, the wall balustrade 500 may be made of either concrete or steel. In such a structure, the flexible pipe 710 deforms to follow the movement and expansion / contraction of the bridge in the bridge axis direction, and further to the movement in the direction approximately perpendicular to the bridge axis direction, so it is possible to prevent damage, etc.

[0045] However, when the pull box 550 is installed on the back of the wall parapet 500, a high-altitude work vehicle must be used for maintenance of the wiring inside the pull box 550, and if there is a road or a structure that a third party can enter under the bridge, traffic lanes on the road on the bridge side must be restricted. Alternatively, an inspection road or the like that allows access to the pull box 550 may be provided separately on the outside of the bridge, but this has the problem of space restrictions. In addition, if there are other roads or structures that run parallel to the bridge, it is difficult to inspect from the back side of the wall parapet 500. In addition, in snowy areas, there is a risk that snow and icicles on the top surface of the pull box 550 will fall downward, and safety measures must be taken for vehicles and people passing under the bridge. In other words, the conventional structure shown in FIG. 15 has the problem of poor maintainability and convenience.

[0046] Therefore, in the balustrade 1 of the present disclosure, the above-mentioned problems are solved by devising the shapes and arrangements of the pipe insertion holes 12B, 13B of the side plates 12, 13 and the pipe insertion hole 44 of the reinforcing rib 40. In other words, the bridge is able to effectively absorb deformation and expansion and contraction while improving maintainability and convenience. Below, the main parts of the balustrade 1 of this embodiment will be described.

[0047] [First embodiment] Fig. 4 is a schematic vertical cross-sectional view of the wall balustrade 1A according to the first embodiment, cut in the bridge axis direction of the bridge. Fig. 5 is a schematic front view showing a pair of wall balustrades 1A installed with an expansion device 600 between them, and a precast concrete wall balustrade 400 connected to the side opposite the expansion device 600 of the wall balustrades 1A.

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

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

[0050] That is, the flexible pipes 80 can be inserted into the long pipe insertion holes 12B, 13B so as to be movable in the axial direction and in the vertical direction. The opening dimensions of the pipe insertion holes 12B, 13B are not particularly limited, but in this embodiment, the short side is about 10 cm and the long side is about 70 cm.

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

[0052] The pipe insertion hole 44 of the reinforcing rib 40 is an elongated hole or a circular hole depending on the arrangement position of the reinforcing rib 40. In this embodiment, three reinforcing ribs 40 are arranged at a predetermined interval in the left-right direction. Therefore, hereinafter, of the three reinforcing ribs 40, the middle reinforcing rib is referred to as the "middle reinforcing rib 40M", the left reinforcing rib is referred to as the "left reinforcing rib 40L", and the right reinforcing rib is referred to as the "right reinforcing rib 40R". In addition, the pipe insertion hole of the middle reinforcing rib 40M is referred to as the "middle pipe insertion hole 44M", the insertion hole of the left reinforcing rib 40L is referred to as the "left pipe insertion hole 44L", and the insertion hole of the right reinforcing rib 40R is referred to as the "right pipe insertion hole 44R".

[0053] The left pipe insertion hole 44L is formed as an elongated hole extending vertically from the lower end side to the upper end side of the left 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 pipe insertion hole 44R is formed as an elongated hole extending vertically from the lower end side to the upper end side of the right 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] That is, the flexible tubes 80 are configured to be inserted into the left tube insertion hole 44L and the right tube insertion hole 44R so as to be movable in the axial direction and in the vertical direction. The opening dimensions of the left tube insertion hole 44L and the right tube insertion hole 44R are not particularly limited, but in this embodiment, the short side is about 10 cm and the long side is about 70 cm.

[0055] The intermediate pipe insertion hole 44M is formed in a circular hole shape. The intermediate pipe insertion hole 44M is preferably provided in a portion above the vertical middle position of the intermediate reinforcing rib 40M. In this embodiment, a plurality of intermediate pipe insertion holes 44M (four in the illustrated example) are provided according to the number of flexible pipes 80, 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 is seated on the lower inner peripheral surface of the intermediate insertion hole 44M by its own weight.

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

[0057] As shown in Fig. 5, a pair of wall balustrades 1A are installed so as to face each other with a space therebetween in the bridge axis direction, sandwiching an expansion device 600. A precast concrete wall balustrade 400 is connected to the side of each wall balustrade 1A opposite the expansion device 600. A pipe 420 for inserting wiring is embedded in a wall main body 410 of the wall balustrade 400. A plurality of pipes 420 (four in the illustrated example) are provided according to the number of flexible pipes 80, and are arranged at predetermined intervals in the vertical direction. In addition, a connecting portion 430 having a hole or the like for inserting an arc-shaped connecting bolt (not shown) when connecting to another precast concrete wall balustrade is provided in the wall main body 410.

[0058] The piping 420 is embedded in a portion of the wall body 410 below the connecting portion 430. A plurality of inserts 440 having female threaded holes are embedded in the wall body 410 on the wall balustrade 1A side. The inserts 440 are provided corresponding to the bolt insertion holes 12A, 13A (see FIG. 2) of the side plates 12, 13, and when the wall balustrade 1A and the wall balustrade 400 are connected to each other, the bolts B are inserted into the bolt insertion holes 12A, 13A and the bolts B are simply screwed into the female threaded holes of the inserts 440 to assemble them. At this time, the flexible pipe 80 of the wall balustrade 1A is connected to the end of the piping 420 in the wall balustrade 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 piping 420 is set so that the intermediate pipe insertion hole 44M is located above the piping 420. Specifically, the lowest intermediate pipe insertion hole 44M is provided so as to be located above at least the lowest piping 420. The second lowest intermediate pipe insertion hole 44M is provided so as to be located above at least the second lowest piping 420. The third lowest intermediate pipe insertion hole 44M is provided so as to be located above at least the third lowest piping 420. The uppermost intermediate pipe insertion hole 44M is provided so as to be located above the uppermost piping 420.

[0060] In this way, by providing each intermediate pipe insertion hole 44M of the wall balustrade 1A higher than the piping 420 of the corresponding wall balustrade 400, the flexible pipe 80 is lifted upward from the wall balustrade 400 side toward the intermediate reinforcing rib 40M. In other words, the flexible pipe 80, which is bridged in the left-right direction inside a pair of wall balustrades 1A facing each other on the left and right sides of the expansion device 600, is configured to be supported in a state in which two points are lifted up by each of the intermediate pipe insertion holes 44M of the pair of wall balustrades 1A.

[0061] In this embodiment, the length in the pipe axis direction (total length) of the flexible pipe 80 that is bridged inside the pair of wall balustrades 1A is formed to be sufficiently longer than the distance D from the left end of the wall balustrade 1A arranged on the left side to the right end of the wall balustrade 1A arranged on the right side. By providing a margin in the length of the flexible pipe 80 in this way, the flexible pipe 80 that is lifted at two points on the left and right is bent downward between those two points. In addition, the downwardly bent portion of the flexible pipe 80 is movably inserted into the elongated pipe insertion holes 44R, 13B, 12B, 44L.

[0062] In other words, even if the left and right wall parapets 1A are displaced relative to each other in the bridge axial direction or up and down direction due to bridge deformation or expansion, the flexible pipe 80 can follow and deform without interfering with the pipe insertion holes 44R, 13B, 12B, 44L. This enables the flexible pipe 80 to effectively absorb the bridge deformation and expansion, and makes it possible to effectively prevent damage to the flexible pipe 80 and further to the wiring inserted inside the flexible pipe 80.

[0063] In addition, 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 balustrade 1A can be effectively utilized as storage space for wiring and piping, thereby reliably improving convenience.

[0064] Furthermore, the wiring and piping housed within the wall parapet 1A can be easily accessed simply by removing the main body cover part 20, making it possible to carry out maintenance work on the roadside. In other words, a high-altitude work vehicle that was required for maintenance in the conventional structure in which a pull box was attached to the rear surface of the wall parapet (see Fig. 15) is no longer necessary, and maintenance work can be carried out efficiently without lane restrictions on the road above the bridge.

[0065] In addition, maintenance work can be easily performed on the road shoulder, eliminating the need for work on the rear side of the parapet 1A. In other words, even if there are other roads running parallel to the bridge or other structures adjacent to the bridge, inspection and maintenance of the wiring can be easily performed without being affected by these, making it possible to reliably improve maintainability.

[0066] In addition, because the inside of the wall parapet 1A can be effectively used as storage space for wiring and piping, there is no need for a pull box attached to the rear of the wall parapet as in conventional structures, and furthermore, there is no need for piping to connect the pull boxes to each other on the outside of the bridge. This makes it possible to effectively avoid risks such as snow falling from the pull boxes and piping, and even falling icicles, in snowy areas, and also effectively ensures the safety of vehicles and people passing under the bridge.

[0067] Furthermore, among multiple wall balustrades connected in the bridge axis direction, the wall balustrades installed at the ends require higher specifications in terms of joint strength with the deck and strength of the wall body itself than the other wall balustrades installed in parts other than the ends. If the wall balustrades installed at such ends are the steel wall balustrades 1A disclosed herein, it becomes possible to easily meet the required specifications.

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

[0069] As shown in Fig. 7, the number of reinforcing ribs 40 may be an even number (four in the illustrated example) rather than an odd number. In such a case, if the number of reinforcing ribs 40 is an even number of four or more, the pipe insertion holes 44M1, 44M2 of the two middle reinforcing ribs 40M1, 40M2 may be circular holes, and if the number of reinforcing ribs 40 is two, the pipe insertion hole 44 of one of the reinforcing ribs 40 may be a circular hole. In the case of such a structure, the flexible pipe 80 bends downward between the pair of wall balustrades 1A, making it possible to effectively absorb the deformation and expansion and contraction of the bridge.

[0070] As shown in Fig. 8, the wall balustrade 400 connected to the wall balustrade 1A may be made of cast-in-place concrete instead of precast concrete. When the wall balustrade 400 is made of cast-in-place concrete, the pipe 420 may be buried in the upper side of the wall body 410. In this case, the pipe insertion holes 12B, 13B of the side plates 12, 13 connected to the wall balustrade 400 may be circular holes corresponding to the position of the pipe 420, and the other pipe insertion holes 44L, 44M, 44R, 12B, 13B may all be elongated holes. In the structure shown in Fig. 8, the flexible pipe 80 connected to the pipe 420 bends downward between the pair of wall balustrades 1A, making it possible to effectively absorb the movement and expansion and contraction of the bridge.

[0071] [Second embodiment] Next, the details of the balustrades 1B, 1C, and 1D according to the second embodiment will be described with reference to Figs. 9 to 12. Fig. 9 is a perspective view showing the balustrade 1B according to the second embodiment with the main body cover part 20 and the ground cover part 30 removed from the main body part 10. Fig. 10 is a perspective view showing the balustrade 1C connected to the balustrade 1B shown in Fig. 9 with the main body cover part 20 removed. Fig. 11 is a perspective view showing the balustrade 1D connected to the balustrade 1C shown in Fig. 10 with the main body cover part 20 removed. Fig. 11 is a schematic front view showing the balustrades 1B, 1C, and 1D according to the second embodiment connected in the bridge axis direction.

[0072] In the second embodiment, the wall balustrades 1B, 1C, and 1D are all made of steel. The basic structures of the main body 10, the main body cover 20, and the ground cover 30 are configured in substantially the same manner as the wall balustrade 1A of the first embodiment, so detailed explanations thereof will be omitted. Also, in Figs. 10 and 11, the ground cover 30 is not shown.

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

[0074] The balustrade 1C shown in Fig. 10 is an example of a second balustrade of the present disclosure, and is formed with a longer length in the left-right direction than the balustrade 1B shown in Fig. 9. The balustrade 1C has a greater number of reinforcing ribs 40C than the balustrade 1B. Specifically, five reinforcing ribs 40C are arranged at a predetermined interval in the left-right direction inside the main body 10 of the balustrade 1C. Note that the number of reinforcing ribs 40C is not limited to this, and can be an appropriate number according to the specific dimensions, such as the left-right length of the balustrade 1C.

[0075] A hand hole 70 is provided inside the main body 10 of the wall balustrade 1C, and functions as a working space when performing wiring inspection work, etc. The hand hole 70 is an example of a box body of the present disclosure.

[0076] The hand hole 70 is formed in a substantially box-like shape that opens to the front side of the wall balustrade 1C by welding metal plates such as steel plates. Specifically, the hand hole 70 has a rectangular rear plate 71 that forms the rear surface, a rectangular left plate 72 that forms the left surface, a rectangular right plate 73 that forms the right surface, a rectangular upper plate 74 that forms the upper surface, and a rectangular lower plate 75 that forms the lower surface. A removable cover 76 is attached to the main body cover 20 at a portion of the main body cover 20 that corresponds to the opening of the hand hole 70. If the cover 76 is removed from the main body cover 20, the wiring in the hand hole 70 can be easily inspected.

[0077] The handhole 70 is attached by fitting it into a cut-out portion of the reinforcing rib 40C in an approximately U-shape (approximately a U-shape with right-angled corners). Each of the rear plate 71, left plate 72, right plate 73, upper plate 74, and lower plate 75 of the handhole 70 is preferably fixed by joining to the edge of the cut-out portion of the reinforcing rib 40C by welding or the like, so that the strength of the reinforcing rib 40C can be maintained. In the wall balustrade 1C, the handhole 70 is provided in the portion below the approximately middle position of the reinforcing rib 40C in the vertical direction.

[0078] A pipe insertion hole 44C for inserting a flexible pipe 80 (see FIG. 12) is provided in the portion of the reinforcing rib 40C above the handhole 70. The pipe insertion hole 44C is formed in a circular hole shape, and supports the flexible pipe 80 so that it spans in the left-right direction (approximately horizontal direction) within the space above the handhole 70 of the wall balustrade 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 for inserting the flexible pipe 80. In the balustrade 1C, the pipe insertion hole 73A in the right plate 73 is provided so as to be positioned higher than the pipe insertion hole 72A in the left plate 72. That is, in 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, when the balustrade 1B is connected to the left side of the balustrade 1C, the vertical positional relationship of the pipe insertion holes 72A and 73A can be changed so that the pipe insertion hole 72A in the left plate 72 is positioned higher than the pipe insertion hole 73A in the right plate 73.

[0080] Similarly to the wall balustrade 1B, the side plates 12, 13 of the wall balustrade 1C are provided with bolt insertion holes 12A, 13A, respectively, for inserting bolts when connecting to another wall balustrade.

[0081] The balustrade 1D shown in Fig. 11 is formed with a left-right length equivalent to that of the balustrade 1C shown in Fig. 10, and is provided with five reinforcing ribs 40D, just like the balustrade 1C. Note that the number of reinforcing ribs 40D is not limited to this, and can be any number appropriate to the specific dimensions, such as the left-right length, of the balustrade 1D.

[0082] A hand hole 70 is provided inside the main body 10 of the wall parapet 1D. The hand hole 70 of the wall parapet 1D is configured similarly to the hand hole 70 of the wall parapet 1C described above, and therefore a detailed description will be omitted. In the wall parapet 1D, the hand hole 70 is provided in the upper part from approximately the middle position in the vertical direction of the reinforcing rib 40D.

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

[0084] Circular pipe insertion holes 72A, 73A for inserting the flexible pipe 80 are also provided in the left and right plates 72 and 73 of the handhole 70. In the wall balustrade 1D, the pipe insertion hole 73A in the right plate 73 is provided so as to be positioned higher than the pipe insertion hole 72A in 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.

[0085] As shown in Fig. 12, a pair of balustrades 1B are installed facing each other with a space between them in the bridge axis direction, sandwiching an expansion device 600. A balustrade 1C is connected to the side of each of the balustrades 1B opposite the expansion device 600. In addition, a balustrade 1D is connected to the side of the balustrade 1C opposite the balustrade 1B.

[0086] Inside the wall parapet 1D, of the multiple flexible pipes 80, the upper flexible pipes 80 (the upper two in the illustrated example) are lifted upward toward the wall parapet 1C by pipe insertion holes 72A, 73A of handholes 70 provided in the wall parapet 1D. The flexible pipes 80 lifted within the wall parapet 1D are inserted into pipe insertion holes 44C of reinforcing ribs 40C within the wall parapet 1C, and are thereby spanned in the left-right direction within the space above the handholes 70 of the wall parapet 1C.

[0087] In addition, flexible pipes 80 (the two lower ones in the illustrated example) suspended left and right in the space below the handhole 70 in the wall parapet 1D are lifted upward toward the wall parapet 1B by the pipe insertion holes 72A, 73A of the handhole 70 provided in the wall parapet 1C.

[0088] That is, the multiple flexible pipes 80 housed inside the wall parapet 1D and the wall parapet 1C are configured to be lifted upward as they move toward the wall parapet 1B by the pipe insertion holes 72A, 73A of the handholes 70 provided inside these wall parapets 1D and the wall parapet 1C. The flexible pipes 80 lifted by the pipe insertion holes 72A, 73A of the handholes 70 are supported in a lifted state by the pipe insertion holes 12B, 13B of the side plates 12, 13 of the wall parapet 1C that contacts the wall parapet 1B (the wall parapet 1C on the left side in the figure has pipe insertion hole 13B of the right side plate 13, and the wall parapet 1C on the right side in the figure has pipe insertion hole 12B of the left side plate 12).

[0089] In this embodiment, the pipe insertion holes 12B, 13B and the pipe insertion holes 44L, 44M, 44R of the wall balustrade 1B are all formed in 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 balustrade 1C is bent downward inside the pair of wall balustrades 1A facing each other across the expansion device 600. By supporting the flexible pipe 80 while bending it downward in this way, even if the left and right wall balustrades 1B are relatively displaced in the bridge axial direction or up and down direction due to the bridge deformation or expansion, the flexible pipe 80 can effectively absorb the bridge deformation or expansion, and damage to the flexible pipe 80 and further damage to the wiring inserted in the flexible pipe 80 can be effectively prevented.

[0090] In addition, for the wall parapet 1B, the wiring can be easily accessed by simply removing the main body cover portion 20, and for the wall parapets 1C and 1D, the wiring can be easily accessed by simply removing the cover material 76. This allows inspection and maintenance of the wiring to be performed on the roadside, as in the first embodiment, and reliably improves maintainability. In addition, as in the first embodiment, a pull box is not required, so the risk of falling snow or icicles can be avoided, and safety can be reliably improved.

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

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

[0093] In the first embodiment, the wall balustrade 1A is described as being connected to a concrete wall balustrade, but the wall balustrades 1C and 1D of the second embodiment can also be connected to the wall balustrade 1A. The wall balustrades 1C and 1D of the second embodiment can also be used in combination with a concrete wall balustrade (for example, arranged alternately). If the wall balustrades 1C and 1D of the second embodiment are used in combination with a concrete wall balustrade, the weight can be effectively reduced compared to when the entire wall balustrade is made of concrete, and the cost can be reduced compared to when the entire wall balustrade is made of steel.

[0094] In the above embodiment, the wiring is accommodated within the parapets 1A to 1D by inserting it into the flexible pipe 80, but it is also possible to directly accommodate the wiring itself without using the flexible pipe 80. The parapets 1A to 1D of the present disclosure are also widely applicable to parapets installed in places other than the sides of bridges, such as a median strip separating the upper and lower lanes of a road. [Explanation of symbols]

[0095] 1...wall balustrade, 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...upper plate, 20...main body cover, 21...front plate, 22...upper plate, 30...ground cover, 40...reinforcing rib, 44...pipe insertion hole, 80...flexible pipe, 600...tension device

Claims

1. A steel parapet installed on a bridge, which is formed in a hollow box shape having a pair of left and right side plates facing each other with a space therebetween in the bridge axis direction of the bridge, and a wall body capable of accommodating a linear body therein; a plate-shaped reinforcing rib extending vertically inside the wall body; a side hole that penetrates the side plate in the plate thickness direction and into which the linear body can be inserted; a rib hole that penetrates the reinforcing rib in the plate thickness direction and into which the linear body can be inserted, and at least one or both of the side hole and the rib hole are formed in an elongated hole shape that is long in the vertical direction characterized in that it is a parapet.

2. The side hole is formed in the elongated hole shape, the rib hole is formed in a circular hole shape and is provided in the upper part from the intermediate position in the vertical direction of the reinforcing rib, and the linear body inserted into the side hole and accommodated inside the wall body is lifted upward and supported by the rib hole. The parapet according to claim 1.

3. A plurality of the reinforcing ribs are provided, among the plurality of reinforcing ribs, the rib hole of at least one reinforcing rib is formed in a circular hole shape, and the rib holes of the other reinforcing ribs are formed in the elongated hole shape, and the linear body inserted into the side hole formed in the elongated hole shape and the rib hole formed in the elongated hole shape is lifted upward and supported by the rib hole formed in the circular hole shape. The parapet according to claim 2.

4. The wall body faces the road side of the bridge and has a front plate detachably attached to the wall body. The parapet according to claim 1 or 2.

5. It is formed in a hollow box shape having a pair of left and right side plates facing each other with a space therebetween in the bridge axis direction, and is fitted and fixed to a portion where the reinforcing rib is cut out, and is a box body capable of accommodating the linear body therein, a circular hole-shaped side plate hole that penetrates the side plate in the plate thickness direction and into which the linear body can be inserted, among the side plate holes provided in the pair of side plates respectively, one side plate hole is located above the other side plate hole, and the linear body accommodated inside the box body is lifted upward as it goes from the other side plate hole toward the one side plate hole. The parapet according to claim 1 or 2.

6. An installation structure of the parapet according to claim 1 or 2, The pair of the wall parapets are arranged at intervals in the bridge axis direction with a telescopic device for connecting the floor slabs of the bridge therebetween, and the linear body is inserted into the side holes of the pair of the wall parapets, so that the linear body is respectively accommodated in the wall bodies of the pair of the wall parapets, and the linear body is lifted upward and supported in the pair of the wall bodies, so that the linear body is deflected downward between the pair of the wall bodies. An installation structure of a wall parapet, characterized in that.

7. A steel second wall parapet connected in the bridge axis direction to the wall parapet according to Claim 1 or 2, which is formed in a hollow box shape having a pair of left and right second side plates facing each other at intervals in the bridge axis direction, and a second wall body capable of accommodating the linear body, a second side hole that penetrates the second side plate in the plate thickness direction and into which the linear body can be inserted, a plate-shaped second reinforcing rib extending in the vertical direction inside the second wall body, which is formed in a hollow box shape having a pair of left and right second side plates facing each other at intervals in the bridge axis direction, and is fitted and fixed to a portion where the second reinforcing rib is cut out, and a second box body capable of accommodating the linear body inside, and a second side plate hole that penetrates the second side plate in the plate thickness direction and into which the linear body can be inserted, among the second side plate holes respectively provided in the pair of the second side plates, when the second wall parapet is connected to the wall parapet, one of the second side plate holes closer to the wall parapet is located above the other second side plate hole, and the linear body accommodated inside the second box body is lifted upward as it goes from the other second side plate hole toward the one second side plate hole. A second wall parapet, characterized in that.

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