Wall balustrade member and wall balustrade

Abstract

To provide a wall balustrade member composed of a cement-based material, and stably installable over a long period, in a metallic balustrade receiving girder in a viaduct, and a wall balustrade.SOLUTION: A wall balustrade member 10 fixed to a steel receiving girder 110 made of metal to constitute a wall balustrade 1 is made of a precast material composed of a cement-based material, and includes a wall body part 20 and a fixed bottom part 30 provided at an end part of a lower part Hd of the wall body part 20 and fixed to the steel receiving girder 110, a cross-sectional L-shape is formed by the wall body part 20 and the fixed bottom part 30, and an insertion pipe 51 into which a fastening jig 120 for connecting to the steel receiving girder 110 can be inserted is embedded in the fixed bottom part 30, a lower end of the insertion pipe 51 protrudes from a bottom surface of the fixed bottom portion 30, the lower end of the insertion pipe 51 is brought into contact with an upper surface of a flange 111 on an upper side Hu of the steel receiving girder 110, a gap s is provided between the upper surface of the flange 111 on the upper part Hu of the steel receiving girder 110 and the bottom surface of the fixed bottom portion 30, and the fixed bottom portion 30 and the steel receiving girder 110 are connected with each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a balustrade member that constitutes a balustrade that functions as a protective wall or the like, for example, in an viaduct, and a balustrade constituted by the balustrade member. [Background technology]

[0002] Conventionally, viaducts such as road bridges have had to be equipped with parapets that function as protective walls at the ends perpendicular to the bridge axis. Viaducts that require the installation of wall parapets include concrete bridges made of concrete, steel bridges made of steel girders, and composite girder bridges made of concrete and steel.

[0003] Furthermore, as described in Patent Document 1, the wall balustrade components that make up the wall balustrades are made of cement-based materials such as precast concrete, or steel materials, and wall balustrade components made of materials appropriate for the installation environment, etc. are selected and installed.

[0004] For this reason, as described in Patent Document 1, in concrete viaducts made of concrete, the viaduct and the balustrade members are often installed using a combination of the same type of material, such as the balustrade members made of cement-based materials being installed. However, even in viaduct renewal work or new viaduct construction, depending on various conditions, there are cases where the installation location where the balustrade members are installed on the viaduct (hereinafter referred to as the balustrade installation location) and the balustrade members are made of different materials.

[0005] In this way, when the balustrade installation location and the balustrade member are made of different materials, the difference in thermal expansion between them can cause misalignment between the installation surface of the balustrade installation location and the bottom surface of the balustrade member during use. Because this misalignment caused by the difference in thermal expansion repeatedly occurs and disappears with temperature changes, there is a risk of wear or other deformation occurring in at least one of the installation surface of the balustrade installation location and the bottom surface of the balustrade member. In particular, in the case of the balustrade member made of a cement-based material, deformation of the bottom surface can cause problems with the installation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 03-271407 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, the present invention aims to provide a wall balustrade member and wall balustrade made of cement-based materials that can be installed stably over the long term on metal balustrade support girders in viaducts. [Means for solving the problem]

[0008] This invention is a wall balustrade constructed by fixing wall balustrade members to a metal balustrade support girder on an viaduct, wherein the wall balustrade members are precast and made of cement-based material, and are provided with a wall main body portion that constitutes the wall balustrade, and a fixed bottom portion that is provided at the lower end of the wall main body portion and fixed to the balustrade support girder, the fixed bottom portion is provided with an insertion hole through which a fastener can be inserted to connect to the balustrade support girder, and a protrusion is provided on the bottom surface of the fixed bottom portion that protrudes downward around the insertion hole, the bottom surface of the protrusion is abutted against the top surface of the balustrade support girder, and a gap is provided between the bottom surface of the fixed bottom portion and the top surface of the balustrade support girder, and the fixed bottom portion and the balustrade support girder are connected.

[0009] The present invention also provides a wall balustrade component that is fixed to a metal balustrade support beam in an viaduct to form a wall balustrade, the component being made of precast cement-based material and comprising a wall main body that forms the wall balustrade, and a fixed bottom that is provided at the lower end of the wall main body and fixed to the balustrade support beam, the component having an insertion hole through which a fastener can be inserted to connect to the balustrade support beam, and a protrusion that protrudes downward around the insertion hole on the bottom surface of the fixed bottom, the bottom surface of the protrusion protruding from the bottom surface of the fixed bottom.

[0010] The metal balustrade support girders may be those provided on a steel bridge made of steel girders, or those provided on a viaduct made of concrete girders or composite girders. The metal balustrade support girders include, for example, steel materials such as H-shaped steel and L-shaped steel.

[0011] According to this invention, the wall balustrade member made of a cement-based material can be installed stably for a long period of time on a metal balustrade support beam in an viaduct. More specifically, in a wall balustrade component for a metal balustrade support girder in an viaduct, the component is made of precast cement-based material and comprises a wall main body that constitutes the wall balustrade, and a fixed bottom that is provided at the lower end of the wall main body and fixed to the balustrade support girder, and a protrusion around the lower end of a through hole embedded in the fixed bottom, through which a fastener can be inserted to connect to the balustrade support girder, protrudes from the bottom surface of the fixed bottom.

[0012] Therefore, in a fixed state in which the fixed bottom and the balustrade support girder are connected by fasteners, the bottom surface of the protrusion abuts against the top surface of the balustrade support girder, and a gap is provided between the bottom surface of the fixed bottom and the top surface of the balustrade support girder. In other words, although the balustrade support girder and the wall balustrade member are made of different materials, the bottom surface of the protrusion embedded in the fixed bottom abuts against the balustrade support girder, so the abutment point between the fixed bottom and the balustrade support girder is between metals of the same type.

[0013] Therefore, in service, due to the difference in thermal expansion between the metal balustrade support girder and the precast wall balustrade member made of cement-based material, misalignment occurs between the top surface of the balustrade support girder and the bottom surface of the fixed bottom of the wall balustrade member. Even if this misalignment repeatedly occurs and resolves, it is possible to reduce wear and other deformation of the sliding portion between the balustrade support girder and the insertion hole, where the metals of the same type come into contact. Furthermore, because the bottom surface of the fixed bottom does not slide directly against the top surface of the balustrade support girder, the bottom surface of the fixed bottom does not deform. Therefore, the wall balustrade member made of cement-based material can be stably installed on the metal balustrade support girder of a viaduct over a long period of time.

[0014] In one aspect of this invention, the fastener is fixed by a bolt protruding from the upper surface of the balustrade support beam, a first nut that tightens with the bolt on the upper surface side of the fixed bottom, and a second nut that prevents the first nut from loosening, and the first nut may be tightened against the bolt with a torque that is lower than the default tightening torque. The bolts may be provided on the balustrade support beam and inserted into bolt holes so as to protrude from the top surface, or may be stud bolts planted on the top surface of the balustrade support beam.

[0015] The torque lower than the above-mentioned predetermined tightening torque is a torque lower than the predetermined tightening torque required to generate the fastening strength required to fasten the components, and is a torque that can fix the fixed bottom installed on the balustrade support beam to an extent that it does not rattle when the first nut is tightened, or a torque that can fix the wall balustrade component for a long period of time against the action of external forces such as wind and earthquakes.

[0016] This invention allows the fixed bottom to be fixed to the balustrade support beam without rattle. Also, since the second nut is provided, it is possible to prevent loosening of the first nut, which is tightened with a torque lower than the predetermined tightening torque.

[0017] Furthermore, even if misalignment occurs due to the difference in thermal expansion between the metal balustrade support girder and the precast wall balustrade member made of cement-based material, the friction force generated at the sliding point between the upper surface of the balustrade support girder and the lower end of the insertion hole can be reduced, thereby suppressing deformation between the lower end of the insertion hole and the upper surface of the balustrade support girder.As a result, the wall balustrade member does not rattle against the balustrade support girder, and a stable wall balustrade can be installed over the long term.

[0018] As another aspect of the present invention, the insertion hole may be formed with an inner diameter having a predetermined clearance with respect to the diameter of the bolt. With this invention, even if there is a difference in thermal expansion between the metal balustrade support girder and the wall balustrade member, which is precast and made of cement-based material, the difference in thermal expansion can be absorbed by the predetermined clearance between the insertion hole formed with the inner diameter and the bolt, thereby reducing or preventing misalignment from occurring between the upper surface of the balustrade support girder and the lower end of the insertion hole.

[0019] In another aspect of the present invention, the insertion holes may be provided in multiple locations at predetermined intervals in the bridge axis direction, and the spacing between the multiple insertion holes and the play spacing may be set based on the difference between the thermal expansion of the metal that makes up the balustrade support beam and the thermal expansion of the cement-based material.

[0020] This invention allows for efficient installation of a wall parapet that will remain stable for a long period of time. More specifically, by setting the spacing between the multiple insertion holes wider, i.e., by increasing the installation intervals of the fasteners, the number of insertion holes and fasteners can be reduced, improving workability. On the other hand, this may reduce the fixing strength of the wall balustrade member to the balustrade support beam. Furthermore, increasing the spacing between the multiple insertion holes increases the amount of misalignment due to differences in thermal expansion. Therefore, to eliminate or reduce misalignment, it is necessary to set a large clearance between the bolt diameter of the insertion hole formed on the inner diameter. Thus, if the clearance is too large, the fixing of the wall balustrade member to the balustrade support beam by the fasteners becomes unstable.

[0021] Conversely, if the spacing between the multiple insertion holes is set narrower, that is, if the installation spacing of the fasteners is narrowed, the number of insertion holes and fasteners will increase, and the fixing strength of the wall balustrade member to the balustrade support beam will improve, but the ease of connecting the wall balustrade member to the balustrade support beam will decrease.

[0022] By setting the spacing between the multiple insertion holes and the play spacing based on the difference between the thermal expansion of the metal that makes up the balustrade support beam and the thermal expansion of the cement-based material, it is possible to achieve both the fixing strength of the wall balustrade member to the balustrade support beam and the ease of construction of the connection work of the wall balustrade member to the balustrade support beam.

[0023] As another aspect of the present invention, a filler member having cushioning properties may be placed in the gap. According to this invention, the gaps become invisible without impairing the effect of the gaps, and the appearance can be improved.

[0024] In another aspect of the present invention, a pipe that forms the insertion hole may be embedded in the fixed bottom portion, the lower end of the pipe may protrude from the bottom surface of the fixed bottom portion, and the protruding portion may be the lower end of the pipe that protrudes from the bottom surface of the fixed bottom portion. According to this invention, an insertion hole of a desired diameter can be formed in the tubular body.

[0025] In another aspect of the present invention, the pipe body may be provided in plurality at predetermined intervals in the direction perpendicular to the bridge axis. According to this invention, the number of fixing points of the fixed bottom portion to the balustrade support beam is increased, thereby further improving the fixing strength.

[0026] In another aspect of the present invention, the cement-based material may be ultra-high strength fiber reinforced concrete. According to the present invention, a solid and strong wall balustrade member can be constructed. [Effects of the Invention]

[0027] The present invention makes it possible to provide a wall balustrade member and wall balustrade made of cement-based material that can be stably installed over a long period of time on a metal balustrade support beam in an viaduct. [Brief explanation of the drawings]

[0028] [Figure 1] A schematic cross-sectional view of a part of a steel bridge with a wall parapet. [Figure 2] FIG. [Figure 3] An explanatory diagram of wall railing components. [Figure 4] An explanatory diagram of wall railing components. [Figure 5] A partial perspective view of the wall balustrade. [Figure 6] An explanatory diagram of wall railings. [Figure 7] FIG. 10 is a perspective view illustrating the assembly of the wall balustrade. [Figure 8] FIG. 10 is a perspective view illustrating the assembly of the wall balustrade. [Figure 9] FIG. 10 is a perspective view illustrating the assembly of the wall balustrade. DETAILED DESCRIPTION OF THE INVENTION

[0029] An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows a partial schematic cross-sectional view of a steel bridge 100 equipped with a wall railing 1, Figure 2 shows a schematic oblique view of a wall railing member 10, Figures 3 and 4 show explanatory diagrams of the wall railing member 10, Figure 5 shows a partial oblique view of the wall railing 1, Figure 6 shows an explanatory diagram of the wall railing 1, and Figures 7 to 9 show oblique views explaining the assembly of the wall railing 1.

[0030] In more detail, Figure 1 shows a schematic cross-sectional view of a portion of a steel bridge 100 near the end of the bridge in the direction W perpendicular to the bridge axis, where a wall balustrade 1 is provided, and Figure 2 shows a schematic oblique view of the wall balustrade member 10 as viewed from the inside in the perpendicular direction Wi and from above Hu.

[0031] Figure 3(a) shows a cross-sectional view taken along the line AA in Figure 3(c), Figure 3(b) shows a cross-sectional view taken along the line BB in Figure 3(c), and Figure 3(c) shows a plan view of the wall balustrade member 10. Figure 4(a) shows an enlarged view of part a in Figure 3(a), and Figure 4(b) shows an enlarged view of part b in Figure 3(b).

[0032] Figure 5 shows a schematic perspective view of a portion of a wall parapet 1 in which multiple wall parapet members 10 are arranged side by side in the bridge axis direction L, as viewed from the perpendicular inside Wi and from above Hu. In Figure 5, the wall parapet members 10 on both sides of the wall parapet members 10 arranged side by side in the bridge axis direction L are shown by dashed lines. Figure 6(a) shows a cross-sectional view taken along arrow CC in Figure 5, Figure 6(b) shows an enlarged view of part d in Figure 6(a), and Figure 6(c) shows an enlarged view of part c in Figure 5.

[0033] Figure 7 shows a schematic oblique view from the perpendicular inside Wi and above Hu of the state in which a fastening bolt 121 has been attached to a steel support girder 110, Figure 8 shows a schematic oblique view from the perpendicular inside Wi and above Hu of the steel support girder 110 to which the fastening bolt 121 has been attached before the wall balustrade member 10 has been installed, and Figure 9 shows a schematic oblique view from the perpendicular inside Wi and above Hu of the state in which the wall balustrade member 10 has been installed on the steel support girder 110 and is being fastened with a fastening jig 120.

[0034] Note that the left-right direction in Figure 1 is the bridge axis perpendicular direction W, the up-down direction is the height direction H, and the direction perpendicular to the bridge axis perpendicular direction W and the height direction H, i.e., the direction towards the front and back of the page, is the bridge axis direction L. Also, the upper side in the height direction H is the upper side Hu, and the lower side is the lower side Hd. Furthermore, in Figure 1, the right side is the perpendicular inside Wi, which is the inside of the bridge axis perpendicular direction W, and the left side is the perpendicular outside Wo of the bridge axis perpendicular direction W. Note that the above directions will also be used in the following explanation of the wall parapet member 10.

[0035] The wall railing 1 is a wall railing that constitutes a protective wall that protrudes upward Hu at the end of the steel bridge 100 in the direction perpendicular to the bridge axis W, and is installed so as to be continuous in the bridge axis direction L. Specifically, the balustrade 1 is constructed by fixing a balustrade member 10 with a fastening jig 120 to a steel support girder 110 provided at the end of the steel bridge 100 in the direction W perpendicular to the bridge axis.

[0036] The steel support girder 110 is composed of an H-shaped steel material having two flanges 111 arranged on both sides in the height direction H and a web 112 connecting the two flanges 111 in the height direction H, and is arranged so as to continue in the bridge axis direction L at the end of the outer perpendicular direction Wo of the steel bridge 100, and a wall balustrade member 10 can be connected to the upper surface of the flange 111 on the upper Hu of the steel support girder 110 to form a wall balustrade 1.

[0037] In addition, in the flange 111 of the upper Hu of the steel support girder 110, bolt holes 113 through which the bolt shanks of the fastening bolts 121 of the fastening jig 120 described later can be inserted are spaced apart at a predetermined interval D (see Figure 7) in the bridge axis direction L, and are arranged in two rows at a predetermined interval in the direction perpendicular to the bridge axis W. The predetermined interval D between the multiple arranged bolt holes 113 corresponds to the pitch p (see Figure 3(a)) between the insertion pipes 51 embedded in the fixed bottom parts 30 of the wall parapet members 10 described later.

[0038] The fastening jig 120 that connects and fixes the wall balustrade member 10 (described later) to the flange 111, which is the upper surface of the flange 111 of the upper Hu of the steel support girder 110, includes a fastening bolt 121 that is provided so as to protrude from the upper surface of the flange 111 of the upper Hu of the steel support girder 110 to the upper Hu, and nuts 122, 123 that screw into the fastening bolt 121 on the upper surface of the fixed bottom 30 of the wall balustrade member 10. The first nut 122 includes a first nut 122 on the lower Hd and a second nut 123 that prevents the first nut 122 from loosening.

[0039] The fastening jigs 120 are arranged at predetermined intervals in the bridge axis direction L and the bridge axis perpendicular direction W. Specifically, the fastening jigs 120 are arranged in multiple positions in the bridge axis direction L of the wall parapet member 10 at a pitch p (described later), and are also arranged on both sides of the bridge axis perpendicular direction W, sandwiching the web 112 of the steel support girder 110 between them.

[0040] The wall parapet member 10 is made of precast ultra-high strength fiber reinforced concrete, a cement-based material, and comprises a wall main body portion 20 that constitutes the wall parapet 1, and a fixed bottom portion 30 that is provided at the end Hd below the wall main body portion 20 and fixed to a steel support girder 110, with the wall main body portion 20 and fixed bottom portion 30 forming an L-shaped cross section when viewed from the bridge axis direction L.

[0041] In detail, the wall balustrade member 10 is composed of a wall main body portion 20 that extends along the bridge axis direction L and height direction H, a fixed bottom portion 30 provided at the lower end Hd of the wall main body portion 20, and a rib portion 40 that is installed across the wall main body portion 20 and the fixed bottom portion 30, and is formed to be approximately square when viewed from the direction perpendicular to the bridge axis W and approximately L-shaped when viewed from the bridge axis direction L.

[0042] The wall main body 20 is generally square in shape, with its length in the bridge axis direction L and its length in the height direction H being approximately equal when viewed from the direction W perpendicular to the bridge axis, and is generally plate-shaped with a thin thickness in the direction W perpendicular to the bridge axis, and is provided with a plurality of rib sections 40, described below, at both ends in the bridge axis direction L and at predetermined intervals from each other in the bridge axis direction L. The wall main body 20 also has connecting sections 21 at the ends of the upper Hu that connect the ends of the upper Hu of the plurality of rib sections 40 in the bridge axis direction L.

[0043] The fixed bottom 30 is provided in a manner that protrudes inward in the perpendicular direction Wi from the end of the lower Hd of the wall main body 20, and is formed with a generally rectangular cross section that is long in the direction perpendicular to the bridge axis W when viewed from the bridge axis direction L, with its height in the height direction H being lower than the amount of protrusion inward in the perpendicular direction Wi. The length of the fixed bottom 30 in the direction perpendicular to the bridge axis W is formed to be approximately the same length as the length in the direction perpendicular to the bridge axis W of the top surface of the flange 111 of the upper Hu of the steel support girder 110. The fixed bottom 30 also has an insertion pipe 51 through which the fastening bolt 121 of the fastening jig 120 is inserted; the insertion pipe 51 will be described later.

[0044] As described above, the multiple rib portions 40 are provided at predetermined intervals in the bridge axis direction L at both ends of the wall main body portion 20 in the bridge axis direction L and on the inside in the bridge axis direction L of both ends of the wall main body portion 20. In this embodiment, three rib portions 40 are provided at both ends of the wall main body portion 20 in the bridge axis direction L and on the inside in the bridge axis direction L of both ends of the wall main body portion 20, spaced at predetermined intervals from each other in the bridge axis direction L. In addition, the rib portions 40 at both ends in the bridge axis direction L are called end rib portions 40a.

[0045] In addition, the rib portion 40 is arranged across the inner surface Wi of the wall main body portion 20 in the perpendicular direction and the upper surface of the fixed bottom portion 30, with the rib upper portion 41 being approximately 1 / 3 of the upper Hu in the height direction H and the rib lower portion 42 being approximately 2 / 3 of the lower Hd.

[0046] The upper rib portion 41 protrudes in the perpendicular direction from the surface of the wall main body portion 20 on the inner side Wi of the perpendicular direction by an amount approximately one-third of the amount of protrusion of the fixed bottom portion 30 protruding in the perpendicular direction Wi, and the lower rib portion 42 protrudes gradually more from the end of the lower side Hd of the upper rib portion 41 toward the lower side Hd, and is inclined so that at the end of the lower side Hd it protrudes by an amount approximately the same as that of the fixed bottom portion 30.

[0047] The rib portion 40 is formed with a width in the bridge axis direction L that is approximately the same as the amount of protrusion of the rib upper portion 41 from the inner surface of the perpendicular inner side Wi of the wall main body portion 20, but the end rib portion 40a provided at the end in the bridge axis direction L is formed thinner than the rib portion 40 provided on the inside in the bridge axis direction L.

[0048] Furthermore, on the outer side of the rib portion 40 in the bridge axis direction L, there is provided a fitting portion 60 that fits with a wall balustrade member 10 that is arranged alongside in the bridge axis direction L. More specifically, the end rib portion 40a on one side in the bridge axis direction L of the wall balustrade member 10 (upper right side in Figure 2) is provided with a fitting protrusion 61 that protrudes towards the wall balustrade member 10 that is arranged alongside, and the end rib portion 40a on the other side in the bridge axis direction L (lower left side in Figure 2) is provided with a concave fitting recess 62 into which the fitting protrusion 61 of the wall balustrade member 10 that is arranged alongside fits. Furthermore, haunches are provided at the inner corners between the inner surface of the wall main body 20 in the perpendicular direction Wi and the connecting portion 21 and the rib portion 40.

[0049] The buried metal fitting 50 having the insertion pipe 51 provided in the fixed bottom part 30 as described above will be explained below. The embedded metal fittings 50 are arranged at the fixed bottom 30 between the rib portions 40 spaced at a predetermined interval in the bridge axis direction L, and are composed of a metal cylindrical insertion tube 51 through which the fastening bolt 121 of the fastening jig 120 that connects the steel support girder 110 and the wall balustrade member 10 is inserted, and a base plate 52 that connects the two insertion tubes 51.

[0050] The insertion pipe 51 is a metal tubular body with an inner diameter and a predetermined thickness that has a predetermined clearance c (see FIG. 6(b)) relative to the outer diameter of the fastening bolt 121, and is arranged so that it penetrates in the height direction H. The clearance c is set to a distance that can absorb the difference in the amount of thermal expansion between the flange 111 of the steel receiving girder 110 and the fixed bottom 30 that are fastened by the fastening jigs 120 arranged at a pitch p, which will be described later.

[0051] Furthermore, two insertion pipes 51 are arranged at a predetermined distance in the direction perpendicular to the bridge axis W. More specifically, they are arranged on both sides of the web 112 of the steel support girder 110 on which the fixed bottom 30 is installed at a predetermined distance in the direction perpendicular to the bridge axis W.

[0052] In this way, the base plate 52 connects the lower ends of the two insertion pipes 51 that are arranged at a predetermined distance in the direction perpendicular to the bridge axis W. The base plate 52 is a rectangular metal plate that is longer in the direction perpendicular to the bridge axis W than in the bridge axis direction L in a plan view, and the bottom surface of the base plate 52 forms the lower end Hd of the insertion pipe 51.

[0053] The buried metal fitting 50 configured in this manner is buried in the fixed bottom part 30 so that the bottom surface of the base plate 52, i.e., the end of the lower Hd of the insertion pipe 51, protrudes downward Hd from the bottom surface, and the end of the upper Hu of the insertion pipe 51 is flush with the top surface. In this embodiment, the bottom surface of the base plate 52, i.e., the end of the lower Hd of the insertion pipe 51, is buried in such a manner that it protrudes from the bottom surface of the fixed bottom part 30 by about 2 to 3 mm.

[0054] The distance between the insertion pipes 51 of the embedded metal fittings 50 arranged between the rib portions 40 in the bridge axis direction L is defined as pitch p (see Figures 3(a) and (c)), and as mentioned above, pitch p corresponds to the predetermined distance D between the bolt holes 113 provided in the flange 111 of the upper Hu of the steel support girder 110.

[0055] As shown in Figures 1 and 5, multiple wall balustrade members 10 constructed in this manner are installed on the steel support girders 110 of the steel bridge 100, connected in the bridge axis direction L, to form the wall balustrade 1.

[0056] Specifically, the wall balustrade member 10 is positioned so that the protruding direction of the fixed bottom 30 is perpendicular to the steel support girder 110 in the steel bridge 100, and the flange 111 of the upper Hu of the steel support girder 110 and the fixed bottom 30 of the wall balustrade member 10 are connected with a fastening jig 120 to form the wall balustrade 1.

[0057] More specifically, the wall railing member 10 is positioned relative to the steel support girder 110 so that the bolt hole 113 provided in the flange 111 of the upper Hu of the steel support girder 110 and the insertion pipe 51 of the embedded hardware 50 embedded in the fixed bottom 30 are connected in the height direction H.

[0058] At this time, because the lower end Hd of the insertion pipe 51 of the embedded metal fitting 50 (the bottom surface of the base plate 52) protrudes downward Hd further than the bottom surface of the fixed bottom portion 30 of the wall balustrade member 10, a gap s (see FIG. 6(b)) is formed between the bottom surface of the fixed bottom portion 30 and the upper surface of the flange 111, and the upper surface of the flange 111 abuts against the lower end Hd of the insertion pipe 51 (the bottom surface of the base plate 52). This gap s is a space of approximately the same height as the amount of protrusion of the embedded metal fitting 50 from the bottom surface of the fixed bottom portion 30.

[0059] Then, the fastening bolt 121 is inserted from below Hd into the bolt hole 113 provided in the flange 111, which is connected in the height direction H, and the insertion pipe 51 of the embedded hardware 50 embedded in the fixed bottom 30, so that the tip of the bolt shaft of the fastening bolt 121 protrudes from the upper surface of the fixed bottom 30.

[0060] Furthermore, a backing plate 130 is placed on the upper surface of the fixed bottom 30 from which the tip of the bolt shank of the fastening bolt 121 protrudes, and nuts 122, 123 are screwed onto the bolt shank of the fastening bolt 121 protruding from the upper surface of the backing plate 130 to fasten the steel support girder 110 to the fixed bottom 30. In this way, the wall balustrade member 10 is fixed to the steel support girder 110 in a manner such that the fixed bottom 30 is sandwiched from both sides in the height direction H between the flange 111 of the upper Hu of the steel support girder 110 and the backing plate 130.

[0061] Specifically, first, a first nut 122 is screwed onto the bolt shank of the fastening bolt 121 protruding from the top surface of the backing plate 130, and then a second nut 123 is screwed onto the upper part Hu of the first nut 122. The first nut 122 is tightened to the fastening bolt 121 with a torque lower than the specified tightening torque. Specifically, when fastening the steel support girder 110 and the fixed bottom 30, the first nut 122 is tightened with a torque lower than the specified tightening torque, which is the torque required to fasten the steel support girder 110 so that axial stress is applied, and the first nut 122 is tightened with a torque that will not cause the wall balustrade member 10 to move inadvertently relative to the steel support girder 110. In this embodiment, the first nut 122 is tightened with a torque of about 100 N·m, which is the same as the torque when tightening by hand.

[0062] Then, by screwing the second nut 123 onto the upper Hu of the first nut 122, which has been tightened to the fastening bolt 121 with a torque lower than the specified tightening torque, the first nut 122 and the second nut 123 have a double nut effect that prevents the first nut 122 and the second nut 123 from accidentally becoming unscrewed.

[0063] Furthermore, an EPDM sponge sheet (not shown) is placed as a filler in the gap s formed between the bottom surface of the fixed bottom 30 and the upper surface of the flange 111. The EPDM sponge sheet is formed to a thickness greater than the distance (height) of the gap s, and is placed while being compressed in the height direction H. Therefore, the EPDM sponge sheet can be placed in the gap s without being fixed to the upper surface of the flange 111 above the steel support beam 110 or the bottom surface of the fixed bottom 30. The EPDM sponge sheet may be placed over the entire gap s formed between the bottom surface of the fixed bottom 30 and the upper surface of the flange 111, or a frame-shaped EPDM sponge sheet may be placed along the outer edge in a plan view.

[0064] Next, the assembly of the wall balustrade member 10 configured as described above will be described with reference to Figures 7 to 9. Note that, whether the next wall balustrade member 10 is to be assembled when a wall balustrade member 10 has already been assembled to the steel support girder 110, or the first wall balustrade member 10 is to be assembled to the steel support girder 110, the assembly is the same except for what is specially noted, and therefore the case where the next wall balustrade member 10 is to be assembled when a wall balustrade member 10 has already been assembled to the steel support girder 110 will be described below.

[0065] Specifically, as shown in Figure 7, when a wall balustrade member 10 has already been assembled to a steel support girder 110 and the next wall balustrade member 10 is to be assembled to the already assembled wall balustrade member 10, first, a fastening bolt 121 is attached to the bolt hole 113 on the outer perpendicular side Wo of the bolt holes 113 provided above Hu of the steel support girder 110.

[0066] In this state, the fastening bolt 121 on the outer perpendicular side Wo attached to the steel support girder 110 is inserted into the insertion pipe 51 on the outer perpendicular side Wo of the embedded hardware 50, and the balustrade member 10 is placed relative to the steel support girder 110 so that the insertion pipe 51 on the inner perpendicular side Wi and the bolt hole 113 are approximately aligned. At this time, the balustrade member 10 is installed so that the fitting protrusion 61 fits into the fitting recess 62 of the already assembled balustrade member 10 (see Figure 8).

[0067] Then, fastening bolts 121 are inserted from below Hd into bolt holes 113 on the inside in the perpendicular direction Wi that communicate in the height direction H and into insertion pipes 51, and backing plate 130 is placed on the top surface of fixed bottom part 30 from which the tips of the bolt shanks of fastening bolts 121 protrude, and nuts 122, 123 are screwed onto the tips of the bolt shanks of fastening bolts 121 that protrude from the top surface of backing plate 130 to fasten the steel support girder 110 and fixed bottom part 30 together, completing the assembly of wall balustrade member 10 to steel support girder 110. This process is then repeated along the bridge axis direction L for the length of the construction, and the wall balustrade 1 is completed.

[0068] Furthermore, since the insertion pipe 51 is formed with a larger diameter than the diameter of the fastening bolt 121, when the wall balustrade member 10 is placed on the steel support girder 110, the position of the wall balustrade member 10 can be adjusted relative to the steel support girder 110 in the bridge axis direction L and the direction perpendicular to the bridge axis W.

[0069] Furthermore, of the two rows of bolt holes 113 arranged at a predetermined interval in the direction W perpendicular to the bridge axis, the bolt hole 113 at the outer side Wo of the web 112 cannot have a fastening bolt 121 inserted into it after the wall balustrade member 10 is placed on the steel support girder 110, as can the bolt hole 113 at the inner side Wi of the web 112.However, since the fastening bolt 121 is attached to the bolt hole 113 at the outer side Wo of the web 112 perpendicularly before the wall balustrade member 10 is placed, fastening work can be easily performed using the fastening jig 120.

[0070] As described above, the wall balustrade 1, which is formed by fixing the wall balustrade member 10 to the metal steel support girder 110 in the steel bridge 100, has the wall balustrade member 10 made of precast cement-based material, and is equipped with a wall main body portion 20 that forms the wall balustrade 1, and a fixed bottom portion 30 that is provided at the end Hd below the wall main body portion 20 and fixed to the steel support girder 110, and the wall main body portion 20 and fixed bottom portion 30 form an L-shaped cross section. Furthermore, an insertion pipe 51 is embedded in the fixed bottom 30, through which a fastening jig 120 for connecting to the steel support girder 110 can be inserted, the lower end Hd of the insertion pipe 51 protruding from the bottom surface of the fixed bottom 30, the lower end Hd of the insertion pipe 51 abutting against the upper surface of the flange 111 of the upper Hu of the steel support girder 110, and a gap s is provided between the upper surface of the flange 111 of the upper Hu of the steel support girder 110 and the bottom surface of the fixed bottom 30, connecting the fixed bottom 30 and the steel support girder 110. Therefore, the wall balustrade member 10 made of a cement-based material can be installed stably for a long period of time on the metal steel support girder 110 in the steel bridge 100.

[0071] More specifically, the wall balustrade member 10, which is precast and made of cement-based material, is attached to the metal steel support girder 110 of the steel bridge 100. The wall main body 20 that constitutes the wall balustrade 1 and the fixed bottom 30 that is provided at the end Hd of the lower part of the wall main body 20 and fixed to the steel support girder 110 are provided, and the wall main body 20 and the fixed bottom 30 form an L-shaped cross section. In the wall balustrade member 10, the end Hd of the lower part of the insertion pipe 51, through which a fastening jig 120 for connecting to the steel support girder 110 can be inserted, protrudes from the bottom surface of the fixed bottom 30.

[0072] Therefore, in a fixed state in which the fixed bottom 30 and the steel support girder 110 are connected by the fastening jig 120, the end of the lower Hd of the inserted pipe 51 abuts against the upper surface of the flange 111 of the upper Hu of the steel support girder 110, and a gap s is provided between the upper surface of the flange 111 of the upper Hu of the steel support girder 110 and the bottom surface of the fixed bottom 30. In other words, although the steel support girder 110 and the wall balustrade member 10 are made of different materials, the end of the lower Hd of the inserted pipe 51 embedded in the fixed bottom 30 abuts against the steel support girder 110, and therefore the abutment points between the fixed bottom 30 and the steel support girder 110 are abutment between metals of the same type.

[0073] Therefore, in service, due to the difference in thermal expansion between the metal steel support girder 110 and the precast wall balustrade member 10 made of a cement-based material, misalignment occurs between the top surface of the flange 111 of the upper Hu of the steel support girder 110 and the bottom surface of the fixed bottom 30 of the wall balustrade member 10. Even if this misalignment occurs and resolves repeatedly, deformation of the sliding portion between the steel support girder 110 and the insertion pipe 51, where the two metals of the same type abut, can be reduced. Furthermore, because the top surface of the flange 111 of the upper Hu of the steel support girder 110 does not slide directly against the bottom surface of the fixed bottom 30, the bottom surface of the fixed bottom 30 is not deformed. Therefore, the wall balustrade member 10 made of a cement-based material can be stably installed on the metal steel support girder 110 of the steel bridge 100 for a long period of time.

[0074] In addition, the fastening jig 120 is fixed by a fastening bolt 121 protruding from the upper surface of the flange 111 of the upper Hu of the steel support girder 110, a first nut 122 that fastens to the fastening bolt 121 on the upper surface side of the fixed bottom 30, and a second nut 123 that prevents the first nut 122 from loosening, and the first nut 122 is tightened against the fastening bolt 121 with a torque that is lower than the predetermined tightening torque.

[0075] Therefore, the fixed bottom 30 can be fixed to the steel support girder 110 without any rattle. In addition, since the second nut 123 is provided, it is possible to prevent the first nut 122, which is tightened with a torque lower than the predetermined tightening torque, from loosening.

[0076] Furthermore, even if misalignment occurs due to the difference in thermal expansion between the metal steel support girder 110 and the precast wall balustrade member 10 made of cement-based material, the friction force generated at the sliding point between the upper surface of the flange 111 of the upper Hu of the steel support girder 110 and the end of the lower Hd of the insertion pipe 51 can be reduced, thereby suppressing deformation between the end of the lower Hd of the insertion pipe 51 and the upper surface of the flange 111 of the upper Hu of the steel support girder 110. Therefore, the wall balustrade member 10 does not rattle relative to the steel support girder 110, and a stable wall balustrade can be installed over the long term.

[0077] Furthermore, because the insertion pipe 51 is formed with an inner diameter that has a predetermined clearance c relative to the diameter of the fastening bolt 121, even if a difference in thermal expansion occurs between the metal steel support girder 110 and the precast wall balustrade member 10 made of cement-based material, the difference in thermal expansion can be absorbed by the predetermined clearance c between the insertion pipe 51 formed with an inner diameter and the fastening bolt 121. Therefore, it is possible to reduce or prevent misalignment from occurring between the top surface of the flange 111 of the upper Hu of the steel support girder 110 and the end of the lower Hd of the insertion pipe 51.

[0078] Furthermore, the pitch p, which is the distance between the multiple insertion pipes 51 arranged in the bridge axis direction L, and the play distance c are set based on the difference between the thermal expansion of the metal that makes up the steel support girder 110 and the thermal expansion of the cement-based material, so that a wall parapet that remains stable over the long term can be installed efficiently.

[0079] More specifically, if the pitch p of the multiple insertion pipes 51 is set wider, i.e., if the installation intervals of the fastening jigs 120 in the bridge axis direction L are increased, the number of insertion pipes 51 and fastening jigs 120 can be reduced, improving workability. However, this may reduce the fixing strength of the wall balustrade member 10 to the steel support girder 110. Furthermore, if the pitch p of the multiple insertion pipes 51 is increased, the amount of misalignment due to differences in thermal expansion increases. Therefore, to eliminate or reduce the misalignment, it is necessary to set a large play distance c relative to the diameter of the fastening bolt 121 of the insertion pipe 51 formed on the inner diameter. In this way, if the play distance c is excessively large, the fixation of the wall balustrade member 10 to the steel support girder 110 by the fastening jigs 120 is likely to become unstable.

[0080] Conversely, if the pitch p of the multiple insertion pipes 51 is set narrower, that is, if the installation spacing of the fastening jigs 120 is narrowed, the number of insertion pipes 51 and fastening jigs 120 increases, and the fixing strength of the wall balustrade member 10 to the steel support girder 110 improves, but the workability of connecting the wall balustrade member 10 to the steel support girder 110 decreases.

[0081] By setting the pitch p of the multiple insertion pipes 51 and the clearance c based on the difference between the thermal expansion of the metal that makes up the steel support girder 110 and the thermal expansion of the cement-based material, it is possible to achieve both the fixing strength of the wall balustrade member 10 to the steel support girder 110 and the ease of construction of the connection work of the wall balustrade member 10 to the steel support girder 110. Furthermore, since an EPDM sponge sheet with cushioning properties is placed in the gaps s, the gaps s become invisible without impairing the effects of the gaps s described above, thereby improving the appearance.

[0082] In addition, since two insertion pipes 51 are installed at a predetermined distance apart in the direction W perpendicular to the bridge axis, the number of fixing points of the fixed bottom 30 to the steel support girder 110 is increased, and the fixing strength of the wall balustrade member 10 to the steel support girder 110 can be further improved. Furthermore, since the wall balustrade member 10 is made of ultra-high strength fiber reinforced concrete, a dense and strong wall balustrade member 10 can be constructed.

[0083] As described above, in correspondence with the configuration of the present invention and the above-mentioned embodiment, The viaduct corresponds to the steel bridge 100. Similarly, The balustrade supports steel supports 110. The wall parapet member corresponds to the wall parapet member 10, The wall parapet corresponds to wall parapet 1, The wall body portion corresponds to the wall body portion 20, The fixed bottom corresponds to the fixed bottom 30, The fastener corresponds to the fastener jig 120; The insertion hole and the tube body correspond to the insertion tube 51, The protrusion corresponds to the end of the lower part Hd of the insertion tube 51, The gap corresponds to the gap s, The bolt corresponds to fastening bolt 121, The first nut corresponds to the first nut 122; The second nut corresponds to the second nut 123, The play interval corresponds to the play interval c, The distance between the tubes corresponds to the pitch p, The filling material is compatible with EPDM sponge sheets. The bridge axis direction corresponds to the bridge axis direction L, The direction perpendicular to the bridge axis corresponds to the direction W perpendicular to the bridge axis, but is not limited to the above embodiment.

[0084] For example, in the above explanation, the steel support girder 110 that fixes the wall balustrade member 10 is positioned at the end of the steel bridge 100 in the direction W perpendicular to the bridge axis, but the wall balustrade 1 may also be formed by fixing the wall balustrade member 10 to a metal steel support girder 110 installed on a viaduct made of concrete girders or composite girders.

[0085] Furthermore, in the above explanation, the steel support girder 110 and the wall balustrade member 10 are fastened together by inserting the fastening bolt 121 into the bolt hole 113 provided in the flange 111 of the upper Hu of the steel support girder 110, but the steel support girder 110 and the wall balustrade member 10 may also be fastened and fixed together with a stud bolt that protrudes from the top surface of the flange 111 of the upper Hu of the steel support girder 110 toward the upper Hu.

[0086] Furthermore, the above-mentioned wall balustrade member 10 is configured to have an approximately L-shape when viewed from the bridge axis direction L, consisting of the wall main body portion 20 and the fixed bottom portion 30 provided at the end portion Hd below the wall main body portion 20, but it may also be formed into an inverted T-shape when viewed from the bridge axis direction L.

[0087] Furthermore, in the above explanation, the embedded hardware 50 embedded in the fixed bottom 30 was embedded in the fixed bottom 30 so that the bottom surface of the base plate 52, i.e., the lower end Hd of the insertion pipe 51, protruded below Hd from the bottom surface, and the upper end Hu of the insertion pipe 51 was flush with the top surface. However, the embedded hardware 50 may not include the insertion pipe 51, but may have an insertion hole with an inner diameter that has a predetermined play distance c (see Figure 6(b)) relative to the outer diameter of the fastening bolt 121, and be composed only of the base plate 52 embedded in such a way that it protrudes about 2 to 3 mm from the bottom surface of the fixed bottom 30. Even in this case, the same functions and effects as those of the wall balustrade 1 described above can be achieved. [Explanation of symbols]

[0088] 1...Wall parapet 10...Wall railing components 20...Wall body 30…Fixed bottom 51...Intubation tube 100…Steel Bridge 110…Steel support girder 120... Fastening jig 121... Fastening bolt 122...First nut 123...Second nut c...Play interval L…Bridge axis direction p...pitch s...gap W…Direction perpendicular to the bridge axis

Claims

1. A wall balustrade configured by fixing a wall balustrade member to a metal balustrade support beam in an viaduct, The wall balustrade member is It is made of precast cement-based materials, The wall is provided with a wall body portion constituting the wall balustrade and a fixed bottom portion provided at the lower end of the wall body portion and fixed to the balustrade support beam, The fixed bottom has An insertion hole is provided through which a fastener for connecting to the balustrade support beam can be inserted, a protrusion that protrudes downward from the periphery of the insertion hole on the bottom surface of the fixed bottom portion, The bottom surface of the protrusion is abutted against the upper surface of the balustrade support beam, and a gap is provided between the bottom surface of the fixed bottom and the upper surface of the balustrade support beam, so that the fixed bottom and the balustrade support beam are connected. Wall railing.

2. The fastener is The balustrade is fixed by a bolt protruding from the upper surface of the balustrade support beam, a first nut fastened to the bolt on the upper surface side of the fixed bottom, and a second nut that prevents the first nut from loosening. The first nut is The bolts were tightened with a torque lower than the specified tightening torque.

2. The wall balustrade of claim 1.

3. The insertion hole is formed with an inner diameter having a predetermined clearance with respect to the diameter of the bolt.

2. The wall balustrade of claim 1.

4. The insertion holes are provided in plurality at predetermined intervals in the bridge axis direction, The spacing between the plurality of insertion holes and the play spacing are The thermal expansion coefficient is set based on the difference between the thermal expansion coefficient of the metal constituting the balustrade support beam and the thermal expansion coefficient of the cement-based material.

4. A wall balustrade according to claim 3.

5. A filling member having cushioning properties is placed in the gap.

5. A wall balustrade according to claim 4.

6. A pipe forming the insertion hole is embedded in the fixed bottom portion, The lower end of the pipe protrudes from the bottom surface of the fixed bottom portion, The protruding portion is the lower end of the pipe body protruding from the bottom surface of the fixed bottom portion. A balustrade according to any one of claims 1 to 5.

7. A wall balustrade member that is fixed to a metal balustrade support beam in an viaduct to form a wall balustrade, It is made of precast cement-based materials, The wall is provided with a wall body portion constituting the wall balustrade and a fixed bottom portion provided at the lower end of the wall body portion and fixed to the balustrade support beam, An insertion hole is provided through which a fastener for connecting to the balustrade support beam can be inserted, a protrusion that protrudes downward from the periphery of the insertion hole on the bottom surface of the fixed bottom portion, The bottom surface of the protrusion protrudes from the bottom surface of the fixed bottom. Wall railing components.

8. A pipe forming the insertion hole is embedded in the fixed bottom portion, The pipe body is a steel pipe made of metal, The lower end of the pipe protrudes from the bottom surface of the fixed bottom portion, The protruding portion is the lower end of the pipe body protruding from the bottom surface of the fixed bottom portion. A wall parapet element according to claim 7.

9. The tube is formed with an inner diameter that has a predetermined clearance for the fastener.

9. A wall parapet element according to claim 8.

10. The pipe body is provided in plurality at predetermined intervals in the bridge axis direction, The intervals between the plurality of pipe bodies and the play intervals are: The thermal expansion coefficient is set based on the difference between the thermal expansion coefficient of the metal constituting the balustrade support beam and the thermal expansion coefficient of the cement-based material.

10. A wall parapet element according to claim 9.

11. The pipes are provided in a plurality at predetermined intervals in the direction perpendicular to the bridge axis. A wall parapet element according to claim 10.

12. The cement-based material is ultra-high strength fiber reinforced concrete. A wall balustrade member according to any one of claims 7 to 11.

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