Inter-girder support device

Abstract

To provide an inter-girder support device that reduces the weight of each member installed between main girders, significantly improves the efficiency of installation work, and increases versatility.SOLUTION: A main girder 3 comprises a foundation metal fitting 10 which has a web 4 that extend in the vertical direction and a flange portion 5 provided at a lower end of the web 4, and is arranged at a predetermined interval on the flange portions 5 between adjacent main girders 3 along the extension direction of a PC girder bridge 2 and are arranged so as to face each other on the respective flange portions, a bracing member 30 whose both ends are connected to each of the opposing foundation metal fittings 10 and presses each of the foundation metal fittings 10 against the side of the web 4, a bridging member 42 that spans the foundation metal fittings 10 that are installed so as to face each other along the extension direction of the PC girder bridge 2, and a plurality of joists 45 that are placed between the opposing bridging members 42 and arranged at a predetermined interval.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an inter-girder support device that is constructed between a plurality of main girders arranged at predetermined intervals from one another in the extension direction of a structure such as a bridge, an elevated road, or a railway on the underside of the structure. [Background technology]

[0002] In general, when inspecting, repairing, renovating, or reinforcing structures such as PC (prestressed concrete) girder bridges, a suspended scaffold for work is temporarily installed below the elevated structure. Patent Document 1, for example, describes a technology for suspending this suspended scaffold from a PC girder bridge.

[0003] In the support structure of the suspended scaffolding described in Patent Document 1, the suspended scaffolding is suspended by a cross member, which is supported by the flanges of adjacent girders or beams. The vertical load of the suspended scaffolding acting on the cross member is supported by the cross member, which has a two-point support structure with both ends supported by flanges. The web portion of the girder or beam is pressed by the pressing portion of the cross member, and the reaction force of the web portion acts on the cross member as a compressive force in the axial direction, maintaining or restraining the position of the cross member.

[0004] The cross member is a metal or steel assembled beam having a structure in which a beam member, a suspension member, a receiving seat portion and a pressing portion are integrally assembled. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6872767 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the support structure of the suspended scaffolding described in the above-mentioned Patent Document 1 has a problem in that the cross members are made of metal or steel, and the beam members, hanging members, receiving seats and pressure members are assembled into a single unit, making the weight of the entire cross member heavy, and it takes a lot of effort for workers to install the cross members between the girders.

[0007] Furthermore, when the support structure of the above-mentioned suspended scaffolding is used by directly spanning the scaffolding boards across the beam members of the cross member, each member of the cross member needs to be sturdy, which increases the weight of the entire cross member, making installation of the cross member even more labor-intensive and reducing the efficiency of installation work.

[0008] Furthermore, the support structure of the above-mentioned suspended scaffolding can only support the suspended scaffolding, and cannot support other structures such as shoring, so there is also the problem that it has very low versatility.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an inter-girder support device that can reduce the weight of each component installed between the main girders, significantly improve the efficiency of installation work, and increase versatility. [Means for solving the problem]

[0010] In order to achieve this goal, the invention described in claim 1 is an inter-girder support device constructed between a plurality of main girders arranged at a predetermined interval from each other on the underside of a structure in the extension direction of the structure, the main girders having a web extending in the vertical direction and a flange portion provided at the lower end of the web, and characterized in that the device comprises: base fittings arranged at a predetermined interval from each other on the flange portions between adjacent main girders along the extension direction of the structure and arranged so as to face each of the flange portions; bracing members whose both ends are connected to each of the opposing base fittings and press each of these base fittings against the side surfaces of the web; a bridging member that is spanned across the base fittings that are installed in plurality so as to face each other along the extension direction of the structure; and beams that are placed between the opposing bridging members and arranged in plurality at a predetermined interval.

[0011] Furthermore, the invention described in claim 2 is characterized in that, in addition to the configuration described in claim 1, a plurality of scaffolding boards are spanned across the plurality of beams.

[0012] The invention described in claim 3 is characterized in that, in addition to the configuration described in claim 1, a plurality of joists are straddled over the plurality of joists in a direction approximately perpendicular to the plurality of joists, ropes are wound around these joists, and the ropes are connected to a suspended scaffolding to suspend the suspended scaffolding.

[0013] Furthermore, the invention described in claim 4 is characterized in that, in addition to the configuration described in claim 1, a plurality of joists are spanned across the plurality of joists in a direction approximately perpendicular to the plurality of joists, and shoring is installed between these joists.

[0014] Furthermore, the invention described in claim 5 is characterized in that, in addition to the configuration described in claim 1, the bridging member is formed into an L-shaped angle on which the end of the beam is placed.

[0015] Furthermore, the invention described in claim 6 is characterized in that, in addition to the configuration described in claim 1, the base bracket has a base bracket main body extending in the vertical direction, the base bracket main body is configured to be vertically divisible and expandable in the vertical direction, and a joining plate is provided at the upper end to which the bridging member is joined.

[0016] Furthermore, the invention described in claim 7 is characterized in that, in addition to the configuration described in claim 1, a continuous inclined surface is formed on the flange portion along the extension direction of the structure, and the base metal fitting has a contact plate that is rotatably mounted on the base metal fitting main body extending in the vertical direction, and the contact plate is configured so that the angle can be freely adjusted along the inclined surface.

[0017] Furthermore, the invention described in claim 8 is characterized in that, in addition to the configuration described in claim 1, the bracing member is configured to be freely expandable and contractible in the axial direction, and is provided with a coarse adjustment section for coarsely adjusting the axial length, and a fine adjustment section for finely adjusting the axial length.

[0018] Furthermore, the invention described in claim 9 is characterized in that, in addition to the configuration described in claim 3 or 4, a fixing bracket is provided at a portion where the joist and the floor joist intersect approximately perpendicularly, and the floor joist is fixed to the joist by the fixing bracket.

[0019] Furthermore, the invention described in claim 10 is characterized in that, in addition to the configuration described in claim 6 or 7, each opposing surface of the base metal fitting main body is provided with a connecting socket into which wedge portions attached to both ends of the bracing member fit to connect the two surfaces.

[0020] The invention described in claim 11 is characterized in that, in addition to the configuration described in claim 1, the main girder is formed from prestressed concrete. Effect of the Invention

[0021] According to the invention described in claim 1, a plurality of base fittings are installed on the flange portion between adjacent main girders so as to face each other at a predetermined interval along the extension direction of the structure, and each of these base fittings is pressed against the side of the web of the main girder with a bracing member, and a bridging member is spanned across the multiple installed base fittings.A plurality of bridging members are arranged between the opposing bridging members at a predetermined interval in the extension direction of the structure, so that each member installed between the main girders is divided, which makes it possible to reduce the weight of each member and significantly improve the efficiency of installation work.

[0022] In addition, according to the invention described in claim 1, the invention can be applied to the assembly of other structures, such as shoring, in addition to suspended scaffolding, thereby improving versatility.

[0023] In addition, according to the invention described in claim 2, multiple scaffolding boards are strung across multiple beams, and multiple beams support multiple scaffolding boards, making it possible to install the scaffolding boards reliably and easily.

[0024] Furthermore, according to the invention described in claim 3, a plurality of joists are strung across a plurality of joists in a direction approximately perpendicular to the plurality of joists, and cables are wound around these joists which are then connected to the suspended scaffolding to suspend it.Since the suspended scaffolding is suspended by winding the cables around the joists, the suspension point and the fastening devices of the suspended scaffolding can be brought close to each other in the vertical direction, making it easier to fasten the suspended scaffolding and also increasing safety.

[0025] In addition, according to the invention described in claim 4, a plurality of joists are arranged on a plurality of joists in a direction approximately perpendicular to the plurality of joists, and shoring is installed between these joists, so that the shoring can be installed reliably and easily.

[0026] In addition, according to the invention described in claim 5, the bridging member is formed into an L-shaped angle on which the end of the beam is placed, so that the end of the beam can be reliably placed according to the site conditions.

[0027] Furthermore, according to the invention described in claim 6, the base fitting has a base fitting main body extending in the vertical direction, and this base fitting main body is configured to be vertically divided so as to be expandable and contractible in the vertical direction, and a joining plate to which the bridging member is joined is provided at its upper end.Therefore, even if there is a difference in height in the flange portion of the main girder along the extension direction of the structure, it is possible to adjust the joining plate to the same height.

[0028] Furthermore, according to the invention described in claim 7, a continuous inclined surface is formed on the flange portion along the extension direction of the structure, and the base fitting has an abutment plate that is rotatably mounted on the base fitting main body extending in the vertical direction, and this abutment plate is configured so that the angle can be freely adjusted along the inclined surface, so that the entire abutment plate can abut against the inclined surface, even if the inclined surface has an angle of various degrees.

[0029] In addition, according to the invention described in claim 8, the bracing member is configured to be freely expandable and contractable in the axial direction, and is provided with a coarse adjustment section for coarsely adjusting the axial length, and a fine adjustment section for finely adjusting the axial length, so that it can accommodate various widths between main girders and increase the types of main girders that can be installed.

[0030] Furthermore, according to the invention described in claim 9, a fixing bracket is provided at the location where the joist and the floor joist intersect approximately perpendicularly, and by fixing the floor joist to the joist using this fixing bracket, it is possible to prevent the suspension points from which the ropes are suspended from shaking.

[0031] In addition, according to the invention described in claim 10, connecting sockets are provided on each opposing surface of the base fitting main body, into which wedge portions attached to both ends of the tension member fit to connect the base fitting, so that the tension member can be attached to the base fitting reliably and easily, thereby improving work efficiency.

[0032] According to the invention described in claim 11, the main girders are formed from prestressed concrete, making it suitable for large-span girder bridges. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 is a perspective view showing an overall structure in which a suspended scaffolding is suspended in one embodiment of an inter-girder support device according to the present invention. [Diagram 2] FIG. 2 is a perspective view showing a base fitting of the inter-girder support device of FIG. 1. [Diagram 3] FIG. 3 is a front view of FIG. 2. [Figure 4] FIG. 4 is a perspective view of FIG. 3 as seen obliquely from behind. [Diagram 5] FIG. 4 is a right side view of FIG. [Figure 6] FIG. 2 is a front view showing a bracing member of the inter-girder support device of FIG. [Figure 7] FIG. 7 is a partial cross-sectional plan view of FIG. 6. [Figure 8]2 is a plan view showing a bridging member of the girder support device of FIG. 1. [Figure 9] FIG. 9 is a cross-sectional view taken along line AA in FIG. 8. [Figure 10] 9 is an enlarged perspective view showing a state in which a beam is fixed to the bridging member of FIG. 8 by a fastener. [Figure 11] FIG. 2 is a front view showing a fixing bracket of the inter-girder support device of FIG. [Figure 12] FIG. 12 is a right side view of FIG. [Figure 13] FIG. 2 is a schematic perspective view showing an assembly procedure 1 of the inter-girder support device according to the embodiment. [Figure 14] 14 is a perspective view showing a state in which the brace member is attached to the base metal fitting in FIG. 13. FIG. [Figure 15] FIG. 4 is a schematic perspective view showing an assembly procedure 2 of the inter-girder support device according to the embodiment. [Figure 16] FIG. 11 is a schematic perspective view showing an assembly procedure 3 of the inter-girder support device according to the embodiment. [Figure 17] FIG. 11 is a schematic perspective view showing an assembly procedure 4 of the inter-girder support device according to the embodiment. [Figure 18] FIG. 5 is a schematic perspective view showing an assembly procedure 5 of the inter-girder support device of the embodiment. [Figure 19] FIG. 11 is a schematic perspective view showing an assembly procedure 6 of the inter-girder support device according to the embodiment. [Figure 20] FIG. 11 is a schematic perspective view showing an assembly procedure 7 of the inter-girder support device according to the embodiment. [Figure 21] FIG. 21 is an enlarged perspective view showing the state in which the joists are fixed to the joists using fixing fittings in FIG. 20 and the suspended scaffolding is suspended by the cables. [Figure 22] FIG. 1 is a perspective view showing an application example 1 in which a suspended scaffolding is suspended from an embodiment of an inter-girder support device according to the present invention, and a scaffolding board is stretched across the joists. [Diagram 23] FIG. 23 is a front view of FIG. 22. [Figure 24] FIG. 11 is a perspective view showing application example 2 in which a scaffolding board is hung on a beam in one embodiment of the inter-girder support device according to the present invention. [Diagram 25] FIG. 25 is a front view of FIG. 24. [Figure 26] FIG. 11 is a perspective view showing application example 3 in which a scaffolding board is spanned over a joist and shoring is installed on a floor joist in one embodiment of the inter-girder support device according to the present invention. [Figure 27] FIG. 27 is an enlarged perspective view showing the state in which supports are installed on the floor joists in FIG. 26. [Figure 28] FIG. 27 is a front view of FIG. 26. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] Hereinafter, one embodiment of the present invention will be described.

[0035] [One embodiment of the invention] FIG. 1 is a perspective view showing an overall structure in which a suspended scaffolding is suspended in one embodiment of an inter-girder support device according to the present invention.

[0036] As shown in Fig. 1, the inter-girder support device 1 of this embodiment is constructed between adjacent main girders 3 on the underside of a PC girder bridge 2 as a structure. These adjacent main girders 3 are arranged at a predetermined interval in the direction in which the PC girder bridge 2 extends, and are installed side by side so as to be parallel to each other in the horizontal direction. Each of the adjacent main girders 3 has a web 4 extending in the vertical direction, and a flange portion 5 provided at the lower end of the web 4. Each of the flange portions 5 has an inclined surface 5a that gradually becomes lower from the inside to the outside, and is formed symmetrically in the direction in which the PC girder bridge 2 extends.

[0037] The girder support device 1 of this embodiment is generally composed of a base metal fitting 10, a bracing member 30, a bridging member 42, a joist 45, a floor joist 47, and a fixing metal fitting 50.

[0038] First, the configuration and function of the base metal fitting 10 will be described.

[0039] Fig. 2 is a perspective view showing a base metal fitting of the inter-girder support device of Fig. 1. Fig. 3 is a front view of Fig. 2. Fig. 4 is a perspective view of Fig. 3 seen obliquely from behind. Fig. 5 is a right side view of Fig. 3. In Figs. 2 to 5, the front side will be referred to as the front side and the back side as the rear side.

[0040] As shown in FIG. 1, the base metal fittings 10 are arranged at a predetermined interval along the extension direction of the PC girder bridge 2 on the flange parts 5 between adjacent main girders 3, and a plurality of base metal fittings 10 are installed on each flange part 5 so as to face each other. As shown in FIG. 2 to FIG. 5, the base metal fitting 10 has a base metal fitting main body 11 formed in a square tube shape, and this base metal fitting main body 11 is configured by dividing it in the vertical direction when installed. The base metal fitting main body 11 has an outer tube part 12 provided on the upper outside when installed, and an inner tube part 13 provided on the lower inside of the outer tube part 12 so as to be able to be inserted inside the outer tube part 12. The base metal fitting 10 of this embodiment weighs 2.6 kg.

[0041] A joining plate 14, to which one end and the other end of adjacent bridging members 42 are joined and fixed, is provided horizontally at the upper end of the outer tube portion 12 in an installed state. This joining plate 14 is formed in a rectangular shape in a plan view, and bolt holes 14a for fixing the bridging members 42 with bolts are formed near both ends. Nuts 15, into which bolts for fixing the bridging members 42 are screwed, are fixed by welding to the underside of the joining plate 14 at the opening positions of these bolt holes 14a.

[0042] A connection socket 16 is provided at approximately the center of the front surface of the outer tube portion 12, into which wedge portions (described later) attached to both ends of the bracing member 30 are fitted to connect the outer tube portion 12. The connection socket 16 is formed in an approximately U-shape in plan view. A rubber cushioning material 17 is attached to approximately the entire back surface of the outer tube portion 12, as shown in FIG. 4, and the rubber cushioning material 17 is for cushioning the base metal fitting 10 against the web 4 when the base metal fitting 10 is pressed against the side surface of the web 4 by the bracing member 30. Two circular holes 12a are provided in the vicinity of the lower ends of the left and right sides of the outer tube portion 12, lined up front and back so that they are at the same height position in the up-down direction.

[0043] At the lower end of the inner cylinder 13, an abutment plate 18 is installed in abutment against the inclined surface 5a so that the angle can be adjusted. Specifically, two brackets 19 are provided on the upper surface of the abutment plate 18, which are fixed opposite to each other at a width interval so as to sandwich the left and right side surfaces of the inner cylinder 13. Each of these brackets 19 has a shaft support hole (not shown) through which a shaft support bolt 20 is inserted. On both the left and right side surfaces near the lower end of the inner cylinder 13, bolt holes communicating with the shaft support holes of the two brackets 19 are provided. Therefore, the shaft portion of the shaft support bolt 20 is continuously inserted into the shaft support holes of the two brackets 19 and the bolt holes on both side surfaces near the lower end of the inner cylinder 13, and a nut 21 is fastened to the shaft portion of this shaft support bolt 20. As a result, in this embodiment, the abutment plate 18 is configured to be rotatable around the shaft support bolt 20 within the range of angle α of 0 to 45°, and the angle can be adjusted freely.

[0044] Cushioning materials 22 made of MC Nylon (registered trademark), for example, having a thickness of 12 mm, are fixed by fasteners to the front and rear of the bottom surface of the contact plate 18. These cushioning materials 22 are intended to cushion the contact plate 18 against the inclined surface 5a when the contact plate 18 comes into contact with the inclined surface 5a.

[0045] As described above, the inner cylinder 13 can be inserted into the outer cylinder 12 and is configured to be freely expandable and contractible with respect to the outer cylinder 12. Specifically, on both sides of the inner cylinder 13, four circular holes 13a are arranged in two rows on the left and right, vertically, and alternately arranged vertically. The four vertical circular holes 13a have a vertical distance D1 of, for example, 25 mm from the center of each circular hole 13a to the center of the adjacent circular hole 13a. The four horizontal circular holes 13a are arranged with a vertical distance D2 offset from each other on the left and right. This distance D2 is, for example, 12.5 mm.

[0046] Then, two circular holes 12a near the lower end of the left and right side surfaces of the outer cylinder portion 12 are moved and adjusted in the vertical direction relative to any of the four circular holes 13a on the left and right of the inner cylinder portion 13 to align the circular holes 12a of the outer cylinder portion 12 and the circular holes 13a of the inner cylinder portion 13 so that they communicate with each other, and the positioning pin 23 is inserted into the circular holes 12a of the outer cylinder portion 12 and the circular holes 13a of the inner cylinder portion 13 that communicate with each other, thereby defining the vertical position of the outer cylinder portion 12 relative to the inner cylinder portion 13. As a result, the outer cylinder portion 12 is able to expand and contract with respect to the inner cylinder portion 13, and the minimum expansion and contraction pitch is 12.5 mm due to the above-mentioned interval D2. That is, in this embodiment, the height position of the joining plate 14 can be adjusted at a pitch of 12.5 mm. Here, the positioning pin 23 is provided with an operation ring 24, and the operator can easily pull out the positioning pin 23 by hooking the operation ring 24 with his or her finger and operating it.

[0047] In this embodiment, an example in which four circular holes 13a are provided in two rows on the left and right sides of the inner cylinder portion 13 has been described, but the present invention is not limited to this and three or more rows on the left and right sides may be provided, and in this case, the three or more rows of circular holes 13a are arranged at different positions from each other in the vertical direction, and three or more circular holes 12a are provided on the left and right side surfaces of the outer cylinder portion 12. This makes it possible to adjust the height position of the joining plate 14 at a finer pitch.

[0048] In addition, in this embodiment, an example has been described in which the base fitting main body 11 has the outer tube portion 12 provided above in the installed state and the inner tube portion 13 provided below this outer tube portion 12, but this is not limited to this, and the vertical positions of the outer tube portion 12 and the inner tube portion 13 may be reversed.

[0049] Next, the configuration and function of the bracing member 30 will be described.

[0050] Fig. 6 is a front view showing a bracing member of the inter-girder support device of Fig. 1. Fig. 7 is a partially sectional plan view of Fig. 6.

[0051] 6 and 7, the bracing member 30 comprises a cylindrical outer pipe 31, an inner pipe 32 provided so as to be insertable into one side of the outer pipe 31, and a jack pipe 37 provided so as to be insertable into the other side of the outer pipe 31. The bracing member 30 is configured to be expandable and retractable by inserting the inner pipe 32 into the outer pipe 31 and moving in the axial direction. A retaining ring 39 is provided near one end of the outer pipe 31 to hold the outer pipe 31 when the inner pipe 32 moves in the axial direction relative to the outer pipe 31.

[0052] A wedge portion 33 is attached to one end of the inner pipe 32 and the other end of the jack pipe 37, and these wedge portions 33 each fit into a connecting socket 16 of the base fittings 10 installed opposite the flange portion 5, thereby connecting the bracing member 30 between the two base fittings 10.

[0053] Here, under normal circumstances, the wedge portion 33 protrudes from the side surface due to a biasing member such as a spring, and has a cross section larger than that of the insertion portion 16a of the connecting socket 16. When the wedge portion 33 is inserted into the insertion portion 16a of the connecting socket 16, the wedge portion 33 is stored in the insertion portion 16a against the biasing force of the biasing member. When the wedge portion 33 is further pressed in, it protrudes from the side surface again due to the biasing force of the biasing member after passing through the insertion portion 16a, and when the wedge portion 33 is pulled out of the insertion portion 16a, the wedge portion 33 maintains the state of protruding from the insertion portion 16a, preventing the wedge portion 33 from coming off.

[0054] A coarse adjustment section 34 for coarsely adjusting the overall length of the bracing member 30 is provided at approximately the middle portion of the bracing member 30, and a fine adjustment section 35 for finely adjusting the overall length of the bracing member 30 is provided at the other end of the outer pipe 31.

[0055] The coarse adjustment portion 34 is provided along the axial direction with a plurality of insertion holes 32a at regular intervals, for example every 100 mm, penetrating the other end of the inner pipe 32 in the radial direction, while an insertion hole 31a shown in Fig. 7 is provided near one end of the outer pipe 31 so as to penetrate the inner pipe 32 in the radial direction. The insertion hole 32a of the inner pipe 32 is formed to have approximately the same diameter as the insertion hole 31a of the outer pipe 31. Then, the inner pipe 32 is moved in the axial direction relative to the outer pipe 31 to align the insertion hole 32a of the inner pipe 32 with the insertion hole 31a of the outer pipe 31 so that the insertion hole 32a of the inner pipe 32 communicates with the insertion hole 31a of the outer pipe 31, and a positioning pin 36 is inserted through the communicating insertion hole 31a of the outer pipe 31 and the insertion hole 32a of the inner pipe 32, thereby making it possible to adjust the length, for example, every 100 mm.

[0056] The fine adjustment section 35 is provided so that one end of a jack pipe 37 can be inserted into the other end of the outer pipe 31. The wedge section 33 is fixed to the other end of the jack pipe 37 by a fastening member. The jack pipe 37 is provided with a thread on its circumferential surface, and a handle 38 is provided to be screwed into this threaded portion.

[0057] When the handle 38 is rotated, for example, clockwise, the handle 38 moves leftward in Figures 6 and 7, shortening the distance between the other end of the outer pipe 31 and the wedge portion 33, causing the bracing member 30 to contract. On the other hand, when the handle 38 is rotated counterclockwise, the handle 38 moves rightward in Figures 6 and 7, lengthening the distance between the other end of the outer pipe 31 and the wedge portion 33, causing the bracing member 30 to extend. In this embodiment, the jack pipe 37 is configured to be able to extend or contract by approximately 110 mm relative to the outer pipe 31 by rotating the handle 38.

[0058] Here, near the other end of the outer pipe 31, long holes 40 are formed along the axial direction so as to face radially opposite the outer pipe 31, and by fixing the outer pipe 31 to the jack pipe 37 with fixing bolts 41 through these long holes 40, the long holes 40 act as a guide when the outer pipe 31 moves left and right, so that the wedge portion 33 always faces downward.

[0059] Next, the configuration and function of the bridging member 42 will be described.

[0060] Fig. 8 is a plan view showing a bridging member of the girder support device of Fig. 1. Fig. 9 is a cross-sectional view taken along line AA of Fig. 8. Fig. 10 is an enlarged perspective view showing a state in which a beam is fixed to the bridging member of Fig. 8 by a fastener.

[0061] 8 and 9, the bridging member 42 is bridged across a plurality of base fittings 10 that are installed facing each other along the extension direction of the PC girder bridge 2. Specifically, the bridging member 42 is formed as a long metal L-shaped angle, and is integrally formed with a horizontal section 43 on which the end of the beam 45 is placed, and a vertical section 44 that is bent from one side of the horizontal section 43 and extends vertically upward.

[0062] Bolt holes 43a are provided near both ends of the horizontal portion 43, and one end of the horizontal portion 43 is joined to the joining plate 14 of one base metal fitting 10 by inserting a hexagonal bolt 49 (shown in FIG. 14) into one of the bolt holes 43a and screwing it into the nut 15 shown in FIGS. 2 to 5. Moreover, the other end of the horizontal portion 43 is joined to the joining plate 14 of the other base metal fitting 10 by inserting a hexagonal bolt 49 into the other bolt hole 14a of the joining plate 14 of the other base metal fitting 10 into the other bolt hole 14a and screwing it into the nut 15. Here, the one base metal fitting 10 and the other base metal fitting 10 are disposed in adjacent positions.

[0063] In this manner, the bridging members 42 are successively bridged across and joined to a plurality of base fittings 10 that are installed facing each other at a predetermined interval along the extension direction of the PC girder bridge 2, thereby connecting the bridge members 42 to each other.

[0064] 10, joists 45 made of square pipes with a length of 2.5 m are placed between the opposing bridging members 42, and a number of these joists 45 are arranged at predetermined intervals in the extension direction of the PC girder bridge 2. Both ends of these joists 45 are fixed to the bridging members 42 by fixtures 46 such as catch clamps shown in FIG.

[0065] A number of joists 47 made of 3-m-long square pipes are arranged on the beams 45 in a direction approximately perpendicular to the beams 45, and these joists 47 are fixed by fixing brackets 50 at intersections 48 approximately perpendicular to the beams 45, as shown in Figure 21.

[0066] Next, the configuration and function of the fixing bracket 50 will be described.

[0067] Fig. 11 is a front view showing a fixing fitting of the inter-girder support device of Fig. 1. Fig. 12 is a right side view of Fig. 11.

[0068] As shown in Figures 11 and 12, the fixing bracket 50 is provided to straddle the intersection 48 where the joist 45 and the joist 47 are substantially perpendicular to each other, and is for fixing the joist 47 to the joist 45. The fixing bracket 50 has U-shaped brackets 53, 54 formed with a U-shaped cross section that are hung above and below two long hexagonal bolts 51, 52. These U-shaped brackets 53, 54 are arranged so that the openings 53a, 54a sides face each other. The openings 53a, 54a sides of the U-shaped brackets 53, 54 have cutouts 53b, 54b with steps on both sides between the hexagonal bolts 51, 52.

[0069] Hexagonal bolts 51, 52 are inserted into both ends of the upper and lower U-shaped metal fittings 53, 54 so that the U-shaped metal fittings 53, 54 can move up and down without being screwed in. The upper U-shaped metal fitting 53 is prevented from moving upward by heads 51a, 52a of the hexagonal bolts 51, 52, and is prevented from moving downward by a locking nut 55 screwed onto the shaft 51b of one of the hexagonal bolts 51.

[0070] Further, downward movement of the U-shaped metal fitting 54 disposed below is stopped by a locking nut 56. The U-shaped metal fitting 54 disposed below can be moved upward by tightening the fastening nuts 57, 58.

[0071] To fix the joist material 47 to the joist material 45 using the fixing bracket 50 configured in this manner, first remove the tightening nut 57 from the shaft portion 51b of the hexagonal bolt 51 on which the locking nut 56 is not screwed. This makes it possible to pull out the shaft portion 51b of the hexagonal bolt 51 from the U-shaped bracket 54 located below. When the shaft portion 51b of the hexagonal bolt 51 is pulled out from the U-shaped bracket 54, the U-shaped bracket 54 located below becomes rotatable about the shaft portion 52b of the hexagonal bolt 52.

[0072] The U-shaped metal fitting 54 is rotated and removed from the space formed between the U-shaped metal fitting 53 and the hexagonal bolts 51, 52, and the intersection 48 between the beam 45 and the joist 47 is positioned between the shafts 51b, 52b of the hexagonal bolts 51, 52, and then the U-shaped metal fitting 53 is installed so as to straddle the intersection 48.

[0073] Then, the U-shaped metal fitting 54 arranged below is rotated to its original position around the shaft portion 52b of the hexagonal bolt 52. At this time, the shaft portion 51b of the hexagonal bolt 51 is withdrawn by a predetermined length and retracted from the position of the U-shaped metal fitting 54 rotated to its original position. Next, the shaft portion 51b of the hexagonal bolt 51 is inserted into the U-shaped metal fitting 54, and a tightening nut 57 is attached to the shaft portion 51b. Then, the tightening nut 57 is tightened together with the tightening nut 58 so that the U-shaped metal fitting 54 moves upward, and the intersection portion 48 is sandwiched between the U-shaped metal fitting 54 and the U-shaped metal fitting 53, making it possible to firmly fix the joist material 47 to the joist material 45.

[0074] Here, when the joist material 47 is clamped and fixed to the beam material 45 with the C-shaped metal fittings 53, 54 arranged above and below, cutout portions 53b, 54b are formed on the openings 53a, 54a side of the C-shaped metal fittings 53, 54. Therefore, by holding the beam material 45 and the joist material 47 with the cutout portions 53b, 54b, it is possible to prevent the beam material 45 and the joist material 47 from shifting out of position.

[0075] 1, a plurality of cables 60 such as chains or wires are wound around the joists 47, and one end of each of these cables 60 is inserted through a fastener 62 of a suspended scaffold 61 and connected to the other end of the cables 60 by a connector (not shown), thereby suspending the suspended scaffold 61. The fastener 62 is formed in an inverted U-shape as shown in FIG.

[0076] Next, an installation procedure for one embodiment of the inter-girder support device according to the present invention will be described with reference to Figs.

[0077] First, in installation procedure 1 shown in Figure 13, two of the three workers standing on existing scaffolding (not shown) press two base fittings 10 against the lower ends of the webs 4 so that they face each other on the flange portions 5 between adjacent main girders 3 to position them, and then the other worker fits the wedge portions 33 of the bracing members 30 into the connecting sockets 16 of these base fittings 10 as shown in Figure 14, connecting them and installing one set.

[0078] In this case, the overall length of the bracing member 30 is roughly adjusted by the coarse adjustment section 34, and then the overall length is finely adjusted by the fine adjustment section 35, so that the bracing member 30 can be fixed to the two base fittings 10 by pressing each of the two base fittings 10 against the side surfaces of the web 4.

[0079] Then, two opposing foundation fittings 10 are installed in the same manner as described above at a specified interval along the extension direction of the PC girder bridge 2, and workers fit the wedge portions 33 of the tension members 30 into the connecting sockets 16 of these foundation fittings 10 to connect them, until four sets are installed, for example, for three spans.

[0080] Then, as shown in installation procedure 2 of FIG. 15, one or two workers attach adjustable clamps 25 to approximately the middle portions of the three bracing members 30 in the length direction.

[0081] 16, the single pipe 26 serving as the stiffening material is stretched across the three bracing members 30 and fixed to the adjustable clamps 25 attached to each of the three bracing members 30. In this case, in this embodiment, one single pipe 26 is attached to each of the three bracing members 30. Also, by stretching the single pipe 26 across the three bracing members 30 and fixing it, the spacing between the three spans of the three bracing members 30 can be adjusted to a constant value.

[0082] Then, as shown in installation procedure 4 of FIG. 17, the bridging members 42 are bridged across the three base fittings 10 that are installed facing each other along the extension direction of the PC girder bridge 2.

[0083] In this case, in this embodiment, as described above, one end of the horizontal part 43 is joined to the joining plate 14 of one base metal fitting 10 by inserting a hexagonal bolt 49 into one of the bolt holes 43a of the horizontal part 43 of the bridging member 42 and one of the bolt holes 14a of the joining plate 14 of one base metal fitting 10 and screwing it into the nut 15. Also, the other end of the horizontal part 43 is joined to the joining plate 14 of the other base metal fitting 10 by inserting a hexagonal bolt 49 into the other bolt hole 14a of the joining plate 14 of the other base metal fitting 10 and screwing it into the nut 15. In this way, the bridging member 42 is sequentially joined and connected to the base metal fittings 10 installed so as to face each other at a predetermined interval along the extension direction of the PC girder bridge 2.

[0084] Then, as shown in installation procedure 5 in Fig. 18, two to three workers place multiple beams 45 on the bridging members 42 at positions spaced apart at predetermined intervals along the extension direction of the PC girder bridge 2, in a direction perpendicular to the bridging members 42. These beams 45 are fixed to the horizontal parts 43 of the bridging members 42 with fixing devices 46 such as catch clamps, as shown in Fig. 10.

[0085] Furthermore, as shown in installation step 6 of Figure 19, two to three workers arrange a number of joists 47 on top of the joists 45 in a direction approximately perpendicular to the joists 45, and these joists 47 are fixed by fixing brackets 50 at intersections 48 approximately perpendicular to the joists 45, as shown in Figure 21.

[0086] Next, as shown in installation step 7 in Figures 20 and 21, a plurality of ropes 60 such as chains, wires, etc. are wound around the joists 47, and one end of these ropes 60 is inserted through a fastening device 62 of the suspended scaffolding 61 and connected to the other end of the ropes 60 with a connector not shown, thereby suspending the suspended scaffolding 61.

[0087] In this case, the rope 60 wound around the joist material 47 can be positioned approximately directly above the fastener 62 of the suspended scaffolding 61, making it possible to suspend the suspended scaffolding 61 without tilting the rope 60. As a result, it is possible to significantly increase the assembly efficiency of the suspended scaffolding 61 and to increase safety.

[0088] Next, another application example 1 of the embodiment of the inter-girder support device according to the present invention will be described.

[0089] Fig. 22 is a perspective view showing an application example 1 in which a suspended scaffolding is suspended from an embodiment of the inter-girder support device according to the present invention and a scaffolding board is hung on the joists. Fig. 23 is a front view of Fig. 22.

[0090] As shown in Figures 22 and 23, in application example 1 of the inter-girder support device 1, a plurality of joists 47 are arranged in a direction approximately perpendicular to a plurality of joists 45, cables 60 are wrapped around these joists 47, and a suspended scaffolding 61 as a structure is suspended by these cables 60. In addition, a plurality of scaffolding boards 63 as a structure are spanned on the plurality of joists 45 between the plurality of joists 47.

[0091] By configuring in this manner, according to Application Example 1, the scaffolding board 63 can be set up reliably and easily, and work can be performed both on the suspended scaffolding 61 and on the scaffolding board 63.

[0092] Next, another application example 2 of the embodiment of the inter-girder support device according to the present invention will be described.

[0093] Fig. 24 is a perspective view showing an application example 2 in which a scaffolding board is hung on a beam in one embodiment of the inter-girder support device according to the present invention. Fig. 25 is a front view of Fig. 24.

[0094] As shown in Figures 24 and 25, in application example 2 of the inter-girder support device 1, multiple beams 45 are arranged at predetermined intervals between opposing bridging members 42 in the direction in which the PC girder bridge 2 extends, and multiple scaffolding boards 63 are spanned on these beams 45.

[0095] With this configuration, according to Application Example 2, multiple scaffolding boards 63 are supported by multiple beams 45, so that the scaffolding boards 63 can be installed reliably and easily.

[0096] Next, another application example 3 of the embodiment of the inter-girder support device according to the present invention will be described.

[0097] Fig. 26 is a perspective view showing an application example 3 in which a scaffolding board is placed over a joist and shoring is installed on a floor joist in one embodiment of the inter-girder support device according to the present invention. Fig. 27 is an enlarged perspective view showing the state in which shoring is installed on the floor joist in Fig. 26. Fig. 28 is a front view of Fig. 26.

[0098] 26 to 28, in an application example 3 of the inter-girder support device 1, a plurality of scaffolding boards 63 are spanned on a plurality of joists 45 between a plurality of floor joists 47, and shoring 64 is installed as a structure between the plurality of floor joists 47. The shoring 64 is attached to the floor joists 47 by mounting brackets 65 formed in a U-shape.

[0099] Specifically, in Application Example 3, 100 mm square pipes are used for the beams 45 and the joists 47. These square pipe beams 45 and joists 47 are installed so that their upper surfaces are flat. In Application Example 3, 100 mm square pipes are used for the beams 45 and the joists 47, so general-purpose products can be used.

[0100] By configuring it in this manner, according to application example 3, the mounting bracket 65 is supported on the flat upper surface of the joist material 47, making it possible to stably install the support structure 64, and it can be installed reliably and easily.

[0101] Thus, according to this embodiment, a plurality of base fittings 10 are installed on the flanges 5 between adjacent main girders 3 so as to face each other at a predetermined interval along the extension direction of the PC girder bridge 2, and these base fittings 10 are pressed against the side surfaces of the webs 4 of the main girders 3 with the bracing members 30, and the bridging members 42 are installed across the plurality of installed base fittings 10, and a plurality of joists 45 are arranged between the opposing bridging members 42 at a predetermined interval along the extension direction of the PC girder bridge 2. As a result, each member installed between the main girders 3 is divided, so that each member can be made lighter and the installation work efficiency can be significantly improved. In addition, according to this embodiment, in addition to the suspended scaffolding 63, it can also be applied to the assembly of other structures such as the shoring 64 as described above, so that versatility can be improved. Furthermore, since the beams 45 are arranged between the opposing bridging members 42, the positional relationship between the bridging members 42 and the beams 45 can be freely changed, and even if there is an obstacle in the flange portion 5, the obstacle can be easily avoided.

[0102] In addition, according to this embodiment, multiple scaffolding boards 63 are spanned across multiple beams 45, and multiple scaffolding boards 63 are supported by multiple beams 45, so that the scaffolding boards 63 can be installed reliably and easily.

[0103] In addition, according to this embodiment, a number of joists 47 are arranged in a direction approximately perpendicular to the number of joists 45, and ropes 60 are wound around these joists 47. These ropes 60 are connected to the suspended scaffolding 61 to suspend the suspended scaffolding 61. Since the ropes 60 are wound around the joists 47 to suspend the suspended scaffolding 61, the vertical positions of the suspension point and the fastening device 62 of the suspended scaffolding 61 can be brought close to each other, making the operation of fastening the suspended scaffolding easier and also increasing safety.

[0104] According to this embodiment, the plurality of joists 47 are arranged in a direction substantially perpendicular to the plurality of joists 45, and the shoring 64 is installed between these joists 47, so that the shoring 64 can be installed reliably and easily. In addition, clamping fittings or the like can be used on some of the joists 47, making it possible to connect them to the middle scaffolding.

[0105] Furthermore, according to this embodiment, the bridging member 42 is formed into an L-shaped angle on which the end of the beam 45 is placed, so that the end of the beam 45 can be reliably placed according to the site conditions.

[0106] In addition, according to this embodiment, the base fitting 10 has a base fitting main body 11 that extends in the vertical direction, and this base fitting main body 11 is configured to be divided in the vertical direction so as to be able to expand and contract in the vertical direction, and a joining plate 14 to which the bridging member 42 is joined is provided at its upper end.Therefore, even if there is a difference in height in the flange portion 5 of the main girder 3 along the extension direction of the PC girder bridge 2, it is possible to adjust the joining plate 14 to the same height.

[0107] In addition, according to this embodiment, a continuous inclined surface 5a is formed on the flange portion 5 along the extension direction of the PC girder bridge 2, and the base metal fitting 10 has an abutment plate 18 that is rotatably mounted on the base metal fitting main body 11 extending in the vertical direction, and this abutment plate 18 is configured so that the angle can be freely adjusted along the inclined surface 5a, so that the entire surface of the abutment plate 18 can be abutted against the inclined surface 5a even if the inclined surface 5a has various angles.

[0108] In addition, according to this embodiment, the bracing member 30 is configured to be freely expandable and contractable in the axial direction, and is provided with a coarse length adjustment section 34 that coarsely adjusts the axial length, and a fine length adjustment section 35 that finely adjusts the axial length, so that it can accommodate various widths between the main girders 3, and the number of types of main girders 3 that can be installed can be increased.

[0109] Furthermore, according to this embodiment, a fixing bracket 50 is provided at the location where the beam 45 and the joist 47 intersect approximately perpendicularly, and the joist 47 is fixed to the beam 45 by this fixing bracket 50, thereby preventing the suspension point from which the rope 60 is suspended, etc. from shaking.

[0110] Furthermore, according to this embodiment, connecting sockets 16 are provided on each of the opposing surfaces of the outer tube portion 12 of the base fitting 10, into which wedge portions 33 attached to both ends of the tension member 30 fit to connect the base fitting 10. This allows the tension member 30 to be attached to the base fitting 10 reliably and easily, thereby improving work efficiency.

[0111] Moreover, according to this embodiment, since the main girder 3 is formed from prestressed concrete, it is suitable for a large-span girder bridge.

[0112] [Another embodiment of the invention] Although each embodiment of the present invention has been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and gist of the invention.

[0113] For example, in the above embodiment, an example was described in which the inter-girder support device 1 is installed along the web 4 of a PC girder bridge 2 as a structure, but the present invention is not limited to this and can also be applied to structures such as elevated roads or railways.

[0114] In addition, in the above embodiment, an example was described in which the inter-girder support device 1 was installed on the inclined surface 5a of the flange portion 5 at the lower end of the web 4, but the present invention is not limited to this and can also be applied to cases in which the device is installed on the flange portions of I-shaped steel, H-shaped steel, L-shaped steel, etc.

[0115] Furthermore, in the above application example, an example was described in which the present invention was applied to the assembly of the suspended scaffolding 61 and the shoring 64, but the present invention is not limited to this and can also be applied to the assembly of other structures. [Explanation of symbols]

[0116] 1 Inter-girder support device 2 PC girder bridge (structure) 3 Main girder 4. Web 5 Flange 5a Slope 10 Base metal fittings 11 Base metal fitting body 12 External cylinder 12a circular hole 13 Inner cylinder 13a circular hole 14 Joint plate 14a Bolt hole 15 Nut 16 Connecting nut 16a Insertion part 17 Rubber cushioning material 18 Contact plate 19 Bracket 20 Support bolt 21 Nut 22 Cushioning material 23 Locating pin 25 Adjustable clamp 26 Single Pipe 30 Bracing member 31 Outer pipe 32 Inner pipe 32a Positioning hole 33 Wedge part 34 Coarse adjustment section 35 Fine adjustment section 36 Locating pin 37 Jack pipe 38 Handle 39 Fixing bolt 40 long hole 41 Fixing bolt 42 Bridge members 43 Horizontal section 43a Bolt hole 44 Vertical section 45 Beam 46 Fixtures 47 Joist material 48 Intersection 49 Hexagonal bolt 50 Fixture 51 Hexagonal bolt 51a Head 51b Shaft 52 Hexagon bolt 52a head 52b Shaft 53 U-shaped metal fitting 53a opening 53b Notch 54 U-shaped metal fitting 54a opening 54b Notch 55 Locking nut 56 Locking nut 57 Fastening nut 58 Fastening nut 60 cable 61 Suspended scaffolding (structures) 62 Fastener 63 Scaffolding board (structure) 64 Shoring (Structures) 65 Mounting bracket

Claims

1. A plurality of main girders are disposed at predetermined intervals on the underside of a structure in the extending direction of the structure, and an inter-girder support device is constructed between the main girders, The main girder has a web extending in the vertical direction and a flange portion provided at a lower end of the web, Base fittings are arranged at predetermined intervals on the flange portions between the adjacent main girders along the extension direction of the structure, and are arranged to face each other on the respective flange portions; a bracing member having both ends connected to each of the opposing base metal fittings and pressing each of the base metal fittings against a side surface of the web; A bridging member that spans across the base metal fittings that are installed so as to face each other along the extension direction of the structure; A plurality of beams are placed between the opposing bridge members and arranged at predetermined intervals; An inter-girder support device comprising:

2. The inter-girder support device according to claim 1, characterized in that a plurality of scaffolding boards are spanned across the plurality of beams.

3. The inter-girder support device as described in claim 1, characterized in that a plurality of joists are strung across the plurality of joists in a direction approximately perpendicular to the plurality of joists, and cables are wound around these joists, and the cables are connected to a suspended scaffolding to suspend the suspended scaffolding.

4. The inter-girder support device as described in claim 1, characterized in that a plurality of joists are spanned across the plurality of joists in a direction approximately perpendicular to the plurality of joists, and supports are installed between these joists.

5. The girder support device according to claim 1, wherein the bridging member is formed into an L-shaped angle on which the end of the beam is placed.

6. The inter-girder support device described in claim 1, characterized in that the base fitting has a base fitting main body extending in the vertical direction, the base fitting main body is configured to be divided in the vertical direction so as to be able to expand and contract in the vertical direction, and a joining plate to which the bridge member is joined is provided at its upper end.

7. The inter-girder support device described in claim 1, characterized in that a continuous inclined surface is formed on the flange portion along the extension direction of the structure, and the base metal fitting has a contact plate that is rotatably attached to the base metal fitting main body extending in the vertical direction, and the contact plate is configured to be freely angle-adjustable along the inclined surface.

8. The inter-girder support device as described in claim 1, characterized in that the bracing member is configured to be freely expandable and contractable in the axial direction, and is provided with a coarse adjustment section for coarsely adjusting the axial length, and a fine adjustment section for finely adjusting the axial length.

9. 5. The inter-girder support device according to claim 3 or 4, characterized in that a fixing bracket is provided at a portion where the joist and the floor beam intersect approximately perpendicularly, and the floor beam is fixed to the joist by the fixing bracket.

10. The inter-girder support device according to claim 6 or 7, characterized in that a connecting socket is provided on each of the opposing surfaces of the base metal body, into which wedge portions attached to both ends of the bracing member fit and connect.

11. The inter-girder support device according to claim 1 , wherein the main girder is formed from prestressed concrete.

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