Track support structure

Abstract

To provide a track support structure that can reduce load on bridge girder and stably support a track along which a work machine moves.SOLUTION: A track support structure is located on a bridge girder of precast concrete slab member 3, and has track support members 6 that support a track 4 supported on the upper surface of the bridge girder 2 via through holes 5, 5... that penetrate through the thickness direction. The track support members 6 are provided with flat shoe portions 11 placed on the upper surface of the bridge girder 2, support pillar portions 12 erected on the shoe portions 11, flat track receiving plates 13 fixed to the upper ends of the support pillar portions 12, and fixing means for fixing the track support members 6 within the through holes 5.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a track support structure for supporting a track on which an erection machine or other self-propelled machine travels when constructing a deck of a bridge or an elevated road. [Background technology]

[0002] In recent years, large-scale renovation work has been carried out on aging elevated roads and bridges, and deck replacement work is being actively carried out as part of this large-scale renovation work.

[0003] In this deck replacement work, the existing deck in a designated work area is divided into multiple components (hereinafter referred to as existing deck components) in the bridge axis direction and removed, and after removal, precast concrete deck components (hereinafter referred to as PCa deck components) manufactured in advance at a factory or other facility are lined up in the bridge axis direction in the work area and erected on top of bridge girders such as steel girders.

[0004] The erection work for each PCa deck component begins with the height adjustment device being extended and contracted from the underside of the PCa deck component, which is then temporarily placed on the top surface of the bridge girder via the height adjustment device with a specified gap between them, and the height of the PCa deck component is then adjusted using the height adjustment device.

[0005] Next, stud dowels for integrating the newly constructed precast deck slab with the steel girders are melt-spliced ​​onto the steel girders, aligning them with the dowel holes provided in the PCa deck members.

[0006] The PCa deck member and the bridge girder are integrated by filling the above-mentioned dowel holes and the gap between the PCa deck member and the top surface of the bridge girder with a filler such as non-shrinkage mortar.

[0007] On the other hand, in deck replacement work, it is common to use a mobile crane to remove the existing deck and erect new PCa deck components, but if it is not possible to install a mobile crane near the work site, a deck erection machine is used.

[0008] This deck erection machine is equipped with a moving means that moves on a rail track laid on the deck (bridge surface), a frame in which the main girder section is supported on legs supported by the moving means, and a lifting device supported by the frame, and is capable of sequentially removing existing deck components and erecting PCa deck components while moving on the rail track (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2019-173436 Summary of the Invention [Problem to be solved by the invention]

[0010] When a deck erection machine is used to remove a specified number of existing deck components and then erect new PCa deck components in the area where the existing deck components were removed, after erecting the specified number of new PCa deck components, the deck erection machine must be moved to the next adjacent work area, and in doing so it moves on a rail track laid on top of the new PCa deck components.

[0011] However, with the conventional technology described above, when the PCa deck member is erected, the gap between the PCa deck member and the upper surface of the bridge girder is not yet filled with filler, and when the deck erection machine moves on the rail track laid on the newly installed PCa deck member, the load of the deck erection machine is transmitted to the upper surface of the bridge girder via the rail track, the PCa deck member, and the height adjustment device.

[0012] In this case, the area of ​​the height adjustment device that receives the reaction force from the top of the bridge girder is equivalent to the cross-sectional area of ​​the bolt, so stress is concentrated on the top of the bridge girder, which could cause damage to the top of the bridge girder.

[0013] In view of the above-mentioned conventional problems, the present invention has been made with the object of providing a track support structure that reduces the burden on bridge girders and can stably support the track along which a work machine moves. [Means for solving the problem]

[0014] The invention described in claim 1, which solves the above-mentioned problems of the prior art, is characterized in that when constructing a deck by erecting a plurality of precast concrete deck members in a line in the bridge axis direction on a plurality of parallel bridge girders, the track support structure supports a track for a work machine to move on the plurality of precast concrete deck members that are temporarily placed on the top surface of the bridge girders via height adjustment devices that protrude expandably from the undersides of the precast concrete deck members, and the track support members that support the track are located on the bridge girders of the precast concrete deck members and are supported on the top surface of the bridge girders through through holes that penetrate through the thickness, and the track support members are fixed to the through holes by fixing means.

[0015] The invention described in claim 2 is characterized in that, in addition to the configuration of claim 1, the track support member comprises a flat shoe portion placed on the upper surface of the bridge girder, a support column portion erected on the shoe portion, and a flat track receiving plate fixed to the upper end of the support column portion, and the fixing means is composed of a plurality of stoppers supported on the support column portion so as to be able to expand and contract horizontally at a predetermined height, and the tip ends of the plurality of stoppers abut against the inner surface of the through-hole, thereby fixing the support column portion within the through-hole.

[0016] The feature of the invention described in claim 3 is that, in addition to the configuration of claim 1 or 2, the through holes are dowel holes used when melting and installing dowels that integrate the bridge girder and the precast concrete deck member.

[0017] The invention as set forth in claim 4 is characterized in that, in addition to the configuration of claim 1 or 2, the fixing means are provided in a plurality of stages arranged in the vertical direction of the track support member.

[0018] The invention as set forth in claim 5 is characterized in that, in addition to the configuration of claim 1 or 2, the fixing means is supported so as to be movable in the up and down direction of the track support member.

[0019] The invention as set forth in claim 6 is characterized in that, in addition to the configuration of claim 1 or 2, a height adjusting piece is provided that is detachably fixed below the track support member.

[0020] The invention described in claim 7 is characterized in that, in addition to the configuration of claim 1 or 2, it further comprises a liner member arranged below the track support member, the liner member being thicker than the height of the multiple protrusions protruding from the upper surface of the bridge girder, and being arranged between the protrusions. [Effects of the Invention]

[0021] By being equipped with the structure described in claim 1, the track support structure of the present invention allows the load of a work machine moving on the track to be transmitted to the bridge girder via the track support member with a large cross-sectional area, without going through the precast concrete deck member and height adjuster, thereby reducing the burden on the bridge girder.

[0022] Furthermore, in the present invention, by providing the configuration described in claim 2, the track support member can be stably fixed in the through-hole, and the load of the work machine moving on the track is transmitted to the bridge girder via the large-area flat shoe portion, thereby distributing the load and reducing the burden on the bridge girder.

[0023] Furthermore, in the present invention, by providing the configuration described in claim 3, the through holes used to install the track support members can be used as dowel holes for melt-injecting dowels used to integrate the precast concrete deck members and the bridge girders.

[0024] Furthermore, by providing the configurations set forth in claims 4 to 6 in the present invention, it is possible to accommodate precast concrete deck members of different thicknesses.

[0025] Furthermore, by providing the configuration of claim 7 in the present invention, it is possible to accommodate cases where bolts or the like are provided for splice plates that join steel girders connected to the upper surface of the bridge girder. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a plan view showing an example of an elevated structure using a track support structure according to the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 3] FIG. 3 is an enlarged cross-sectional view of a portion in FIG. 2 where a track support member is installed. [Figure 4] 1A is a cross-sectional view of the track support member installation portion taken along line CC, FIG. 1B is a cross-sectional view of the track support member installation portion taken along line DD, and FIG. 1C is a cross-sectional view of the track support member installation portion taken along line EE. [Figure 5] FIG. 2 is a cross-sectional view taken along the line BB in FIG. [Figure 6] FIG. 6 is an enlarged cross-sectional view of a portion in FIG. 5 where a height adjuster is installed. [Figure 7] 10A and 10B are diagrams showing a procedure for installing the track support member of the same, in which (a) is a longitudinal cross-sectional view showing the state in which the track support member of the same has been inserted into a through-hole, and (b) is a transverse cross-sectional view of the same. [Figure 8] FIG. 10 is a vertical cross-sectional view showing the state of the through-hole portion after the track support member has been removed. [Figure 9] 1(a) is a longitudinal sectional view showing another embodiment of the track support member, and FIG. 1(b) is a sectional view taken along line FF of the same. [Figure 10] FIG. 4 is a cross-sectional view showing another aspect of the track support member of the same. DETAILED DESCRIPTION OF THE INVENTION

[0027] Next, an embodiment of a track support structure according to the present invention will be described based on the examples shown in Figures 1 to 8. In the figures, reference numeral 1 denotes an elevated structure such as a bridge undergoing deck replacement work or new construction.

[0028] As shown in Figure 1, this elevated structure 1 is constructed by erecting multiple precast concrete deck members (hereinafter referred to as PCa deck members 3) in the bridge axis direction on multiple bridge girders 2, 2... such as steel girders arranged in parallel, and the deck is constructed by integrating these multiple PCa deck members 3 with the bridge girders 2, 2... such as steel girders.

[0029] In addition, this elevated structure 1 is equipped with a track support structure that supports a track 4 for a work machine to move on multiple PCa deck members 3 that are temporarily placed on the top surfaces of the bridge girders 2, 2..., and for the removal of existing deck members and the erection of new PCa deck members 3 during deck replacement work or new construction work, a work machine such as a deck erection machine that can move on the track 4 laid on the bridge surface is used, and this work machine moves on the rail track 4 to sequentially remove the existing deck members and erect the PCa deck members 3.

[0030] This track support structure is provided with a plurality of track support members 6 that are positioned on the bridge girders 2, 2… of the PCa deck member 3 and are supported on the upper surfaces of the bridge girders 2, 2… through through holes 5, 5… that penetrate in the thickness direction, and these track support members 6 are fixed to each of the through holes 5, 5… by fixing means, and track rails 4a are laid on the plurality of track support members 6 that are arranged at intervals in the bridge axis direction, so that the track 4 is supported on the bridge girders 2, 2… via the track support members 6.

[0031] The PCa deck member 3 is formed in the shape of a flat concrete plate, and is erected across a plurality of bridge girders 2, 2 . . . with its longitudinal direction oriented perpendicular to the bridge axis.

[0032] This PCa deck member 3 has a plurality of through holes 5, 5... formed at intervals in the short direction (bridge axis direction) on each bridge girder 2, 2..., i.e., at the positions supported by each bridge girder 2, 2..., penetrating through the thickness direction, and height adjustment devices 7, 7 are provided on the outside of the through holes 5, 5... in the bridge axis direction, so that they can be extended and retracted from the underside.

[0033] The through holes 5, 5... are formed in the shape of a long hole or an ellipse with arc portions arranged at both ends perpendicular to the bridge axis, and form dowel holes into which multiple dowels melt-welded to the upper surfaces (upper surfaces of the flanges) of the bridge girders 2, 2... are inserted.

[0034] The shape of the through holes (dowel holes) 5 is not limited to the above-mentioned elongated hole shape and elliptical hole shape, and may be, for example, a square hole shape, a rectangular hole shape, a circular hole shape, etc. Furthermore, the through holes 5, 5... may be formed as tapered holes whose opening on the lower surface side is narrower.

[0035] As shown in Figures 5 and 6, the height adjustment device 7, 7 has a bolt insertion hole 8 that penetrates the thickness direction of the PCa deck member 3, a nut 9 embedded concentrically with the bolt insertion hole 8 halfway through the bolt insertion hole 8, and a support leg rod 10 having a threaded portion 10a that screws into the nut 9, and by rotating the support leg rod 10, the lower part of the support leg rod 10 protruding from the underside of the PCa deck member 3 can be extended or retracted.

[0036] During erection work, the height adjustment devices 7,7 are made to protrude extendibly from the underside of the PCa deck member 3, and are temporarily placed with a specified gap provided on the upper surface of the bridge girders 2,2... via the height adjustment devices 7,7, and the height (level) of the PCa deck member 3 is adjusted using the height adjustment devices 7,7.

[0037] As shown in Figures 2 to 4, the track support member 6 comprises a flat shoe portion 11 placed on the upper surface of the bridge girders 2, 2..., a support column portion 12 erected on the shoe portion 11, a flat track support plate 13 fixed to the upper end of the support column portion 12, and fixing means for fixing the support column portion 12 within the through holes 5, 5..., and is fixed to the PCa deck member 3 while placed on the upper surface of the bridge girders 2, 2...

[0038] The shoe portion 11 is made of a steel plate or the like and has an area that allows it to pass through the through holes 5,5..., and is formed into a rectangular plate that is sufficiently large relative to the cross section of the height adjustment device 7,7, and is designed to be placed on the upper surface of the bridge girders 2,2... (upper surface of the flange of the steel girder).

[0039] The support column 12 is formed by a pair of channel steels 12a, 12a, each having a flange on each side, facing each other at a distance on the back side, with the longitudinal directions of the channel steels 12a, 12a oriented vertically, and the upper surface of the shoe 11 is fixed by welding or the like across the lower ends of the channel steels 12a, 12a, and the lower surface of the track support plate 13 is fixed by welding or the like across the upper ends of the channel steels 12a, 12a. Note that reference numeral 17 in the drawing denotes a reinforcing member whose two adjacent sides are fixed to the side surfaces of the support column 12 and the upper surface of the shoe 11 or the lower surface of the track support plate 13, respectively.

[0040] This support pillar portion 12 is formed at a height (length) such that when the track support member 6 is placed on the top surface of the bridge girders 2, 2... through the through holes 5, 5..., the upper part of the support pillar portion 12 protrudes a certain height from the top surface of the PCa deck member 3, so that it does not interfere with the upper part of the height adjustment devices 7, 7 and does not hinder the operation of the height adjustment devices 7, 7.

[0041] The track support plate 13 is formed in a rectangular plate shape having approximately the same diameter as the shoe portion 11, and the track rail 4a is supported on the upper surface thereof.

[0042] The track support plate 13 has bolt insertion holes 8 formed at the four corners thereof so as to penetrate in the thickness direction of the plate, and fasteners 18, 18 for fixing the track rail 4a can be fixed by bolts 19.

[0043] As shown in Figures 2 and 3, the fixing means is composed of a plurality of stoppers 20, 20 supported at a predetermined height on the support portion 12 so that they can be extended and contracted horizontally, and the tips of the extended stoppers 20, 20 abut against the inner surfaces of the through holes 5, 5... to fix the support portion 12 within the through holes 5, 5...

[0044] The stoppers 20, 20 comprise a base portion 21 supported by both channel steels 12a, 12a constituting the support portion 12, a nut 22 fixed to the base portion 21, and a stopper bolt 23 threadedly engaged with the nut 9, and are adapted to extend and retract relative to the support portion 12 by rotating and threading the stopper bolt 23 relative to the nut 22 fixed to the base portion 21.

[0045] The stoppers 20, 20 are installed symmetrically via the support portion 12, and the stopper bolts 23 are adapted to extend and retract in the horizontal direction.

[0046] The base portion 21 comprises a nut support plate 24 with a bolt insertion hole 24a opening in the center, and a pair of side plates 25, 25 extending from both side edges of the nut support plate 24, with the surface of the nut support plate 24 facing outward horizontally, and the edges of the both side plates 25, 25 opposite the nut support plate 24 are fixed to the sides of the channel steel 12a, 12a that constitute the support portion 12 by welding or the like.

[0047] The nut 22 is fixed to the surface of the nut support plate 24 in a concentric arrangement with the bolt insertion hole 24a, and the stopper bolt 23 threadedly engaged with the nut 22 is adapted to expand and contract in the horizontal direction.

[0048] The stopper bolt 23 is composed of a headed bolt and is screwed into a nut 22 fixed to the base portion 21, with the tip side (opposite the head) being inserted into the bolt insertion hole 24a. By rotating the stopper bolt 23, the head 23a side expands and contracts relative to the nut 22, and the head 23a abuts against the inner surface of the through holes 5, 5...

[0049] To install this track support member 6, as shown in Figs. 5 and 6, the PCa deck member 3 is erected and temporarily placed on the bridge girders 2, 2 . . . via height adjusters 7, 7.

[0050] Next, as shown in FIG. 7, the track support member 6 is inserted into the through holes 5, 5 . . . of the PCa deck member 3 with the stoppers 20, 20 contracted, and the shoe portion 11 is placed on the upper surface of the bridge girder 2.

[0051] At this time, the stoppers 20, 20 are placed facing the arcuate portions arranged at both ends of the through holes 5, 5, . . . , that is, the extension direction of the stoppers 20, 20 is oriented perpendicular to the bridge axis.

[0052] Then, as shown in Figures 2 and 3, the stopper bolt 23 is rotated and extended, and the head 23a of the stopper bolt 23 is brought into contact with the inner surface of each of the through holes 5, 5..., and the support portion 12 is fixed inside the through holes 5, 5... by the fixing means.

[0053] Once the installation of each track support member 6 is complete, the track rails 4a are laid across the multiple track support members 6 spaced apart in the bridge axis direction, and the track rails 4a are fixed to the track support plates 13 with fixing devices 18.

[0054] On the other hand, after a work machine such as a deck erection machine has passed over the track 4, the track rails 4a installed on the track support members 6 are removed, and then the stopper bolts 23 are rotated and contracted to release the fixation of the track support members 6, and the track rails 4a are removed from the through holes 5, 5...

[0055] Next, as shown in Figure 8, multiple stud dowels 26, 26... are melt-inserted onto the upper surface of the bridge girders 2, 2... through the through holes 5, 5... which are dowel holes, and a filler 27 such as non-shrinkage mortar is filled between the dowel holes 5, 5 and the upper surfaces of the bridge girders 2, 2... and the underside of the PCa deck member 3, thereby integrating the bridge girders 2, 2... and the PCa deck member 3.

[0056] The track support structure configured in this manner supports the track support member 6 directly on the upper surface of the bridge girders 2, 2... through the through holes 5, 5... that penetrate the PCa deck member 3 in the thickness direction.Therefore, even if a work machine with a heavy load moves on the track 4, the load is not transmitted to the PCa deck member 3 and the height adjusters 7, 7, and damage to the bridge girders 2, 2... due to stress concentration on the height adjusters 7, 7 can be prevented.

[0057] In addition, in this track support structure, by using dowel holes as the through holes 5, 5 . . . , it is possible to effectively utilize the dowel holes without providing new through holes 5, 5 .

[0058] Furthermore, in this track support structure, the track 4 is laid on track support members 6 arranged at intervals in the bridge axis direction, which makes it possible to suppress vibrations that act in the bridge axis direction when a work machine moves on the track 4, and because the fixing means is composed of a pair of stoppers 20, 20 that expand and contract in the direction perpendicular to the bridge axis, it is also possible to suppress vibrations that occur in the direction perpendicular to the bridge axis when a work machine moves on the track 4.

[0059] In the above embodiment, the case where the shoe portion 11 of the track support member 6 is placed directly on the upper surface of the bridge girder 2 has been described. However, if a plurality of protrusions 14, 14... such as bolts and nuts for fixing splice plates that form the joints between the bridge girders (steel girders) 2, 2 are provided on the upper surfaces of the bridge girders 2, 2..., liner members 15, 16 may be placed under the shoe portion 11 as shown in Figure 9.

[0060] The liner members 15, 16 are made of steel or the like, are thicker than the height of the protrusions 14, 14..., and are formed in the shape of blocks of different sizes, and each liner member 15, 16 is positioned between the protrusions 14, 14... so that the shoe portion 11 does not interfere with the protrusions 14, 14...

[0061] Furthermore, the form of the fixing means is not limited to the above-mentioned embodiment, and in addition to a pair of stoppers 20, 20 that expand and contract in the direction perpendicular to the bridge axis, a pair of stoppers 20, 20 that expand and contract in the bridge axis direction may be provided, and multiple stoppers 20, 20 may be arranged radially to match the shape of the through holes 5, 5...

[0062] Furthermore, the installation mode of the track support member 6 is not limited to the above-described embodiment, and as shown in Fig. 10, a height adjustment piece 30 may be provided that is detachably fixed under the track support member 6 (shoe portion 11), making it possible to accommodate PCa deck slab members 3 of different thicknesses and to adjust the height from the top surface of the PCa deck member 3 to the track 4. Note that the same components as those in the above-described embodiment are given the same reference numerals and their explanations will be omitted.

[0063] Furthermore, the track support member 6 may have fixing means arranged in multiple stages in the vertical direction of the support portion 12, or the fixing means may be supported so as to be movable in the vertical direction of the support portion 12.

[0064] In particular, the track support member 6, when used in conjunction with the height adjustment piece 30, can be used with fixing means arranged in multiple stages in the vertical direction of the support portion 12, or fixing means supported so as to be movable in the vertical direction of the support portion 12, to suit PCa deck members 3 of different thicknesses and to suitably adjust the height from the top surface of the PCa deck member 3 to the track 4.

[0065] Furthermore, the form of the track support member 6 is not limited to the above-described embodiment, and may be, for example, a cylindrical member with both ends closed.

[0066] Furthermore, in the above-described embodiment, the fixing means consisting of multiple stoppers is provided integrally with the track support member 6, but the form of the fixing means is not limited to this. For example, the fixing means may be provided separately from the track support member 6. [Explanation of symbols]

[0067] 1 Elevated structure 2 Bridge girders (steel girders) 3 Precast concrete slab members (PCa slab members) 4 orbits 5 through holes 6 Track support member 7 Height adjustment tool 8 Bolt insertion holes 9 Nuts 10 Support leg bar 11 Kutsube 12 Support section 13 Track receiving plate 14 Protrusions 15 Liner material 16 Liner material 17 Reinforcement member 18 Fixtures 19 volts 20 Stopper 21 Base 22 Nut 23 Stopper bolt 24 Nut support plate 25 Side Panel 26 Stud dowel 27 Filling material 30 Height adjustment piece

Claims

1. When constructing a deck by erecting multiple precast concrete deck members in the bridge axis direction on multiple parallel bridge girders, A track support structure supports a track for a work machine to move on the plurality of precast concrete deck members that are temporarily placed on the upper surface of the bridge girder via height adjustment devices that extend and contract from the underside of the precast concrete deck members, A track support member for supporting the track is positioned on the bridge girder of the precast concrete deck member and supported on the upper surface of the bridge girder through a through hole that penetrates in the thickness direction, The track support structure is characterized in that the track support member is fixed to the through hole by a fixing means.

2. The track support member includes a flat shoe portion placed on the upper surface of the bridge girder, a support column portion erected on the shoe portion, and a flat track support plate fixed to the upper end of the support column, 2. The track support structure according to claim 1, wherein the fixing means is composed of a plurality of stoppers supported at a predetermined height on the support column so as to be extendable and contractible in the horizontal direction, and the tip ends of the plurality of stoppers abut against the inner surface of the through hole, thereby fixing the support column within the through hole.

3. 3. The track support structure according to claim 1, wherein the through holes are dowel holes used when melt-fitting dowels that unite the bridge girder and the precast concrete deck member.

4. 3. A track support structure according to claim 1, wherein the fixing means are provided in a plurality of stages arranged in the vertical direction of the track support member.

5. 3. A track support structure according to claim 1, wherein the fixing means is supported so as to be movable in the vertical direction of the track support member.

6. 3. A track support structure according to claim 1, further comprising a height adjusting piece detachably fixed below said track support member.

7. 3. The track support structure according to claim 1, further comprising a liner member disposed below the track support member, the liner member being thicker than the height of the plurality of protrusions protruding from the upper surface of the bridge girder and being disposed between the protrusions.

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