Component installation device and component installation method

Abstract

To provide a member installation device and a member installation method by which the execution of construction is less likely to be affected by the width of a space when a space is continued in a bridge axial direction between the upper structures of a bridge and a member is installed in the space.SOLUTION: A member installation device for installing a member in a space 60 between upper structures 102, 104 of a bridge 100 comprises two column parts 12 arranged on upper structures 102, 104 of the bridge 100 to sandwich the space 60 when viewed from above, a receiving beam 14 arranged to straddle the upper part of the space 60 and supported by the two column parts 12 and a hanging part 16 attached to the receiving beam 14 and hanging and supporting the member to be installed to be able to elevate are provided.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a member installation device and a member installation method, and more particularly to a member installation device and a member installation method that can be suitably used for installing widening members when widening the superstructure of a bridge. [Background technology]

[0002] Patent Document 1 describes a technique for widening a bridge while keeping part of the road in service. As shown in Figure 19, this technique uses a suspension frame 300 that hoists and lowers an additional main girder 310 used to widen an existing steel bridge 400, placing the additional main girder 310 in a predetermined position, and a first leg 302 of this suspension frame 300 (the leg on the side farther from the existing steel bridge 400) is supported by a support cross beam 304 attached to the existing girder 402 of the existing steel bridge 400 so as to protrude from the existing steel bridge 400 toward the side where the widening work will be carried out.

[0003] For this reason, for example, if there is a space in the bridge axis direction between the superstructures of a bridge on the up line and a bridge on the down line, and widening of this space is to be carried out on both the bridge on the up line and the bridge on the down line, depending on the width of the space, it may be difficult to install the suspension frame 300 on both the up and down lines at the same time, making simultaneous construction on both the up and down lines difficult. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-116730 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above points, and aims to provide a component installation device and a component installation method that, when a space is connected in the bridge axis direction between the superstructures of a bridge and components are to be installed in this space, the execution of construction work is less affected by the width of the space. [Means for solving the problem]

[0006] The present invention is an invention that solves the above-mentioned problems, and provides a member installation device and a member installation method as described below.

[0007] In other words, a first aspect of the component installation device of the present invention is a component installation device for installing components in the space between the superstructures of a bridge, characterized in that it comprises two pillar sections arranged on the superstructure of the bridge so as to sandwich the space when viewed from above, a support beam arranged to span above the space and supported by the two pillar sections, and a hanging section attached to the support beam and suspending and supporting the component to be installed so that it can be raised and lowered.

[0008] A second aspect of the member installation device according to the present invention is an aspect configured such that a plurality of member installation devices according to the first aspect are provided in the direction in which the space extends when viewed from above.

[0009] A third aspect of the component installation device of the present invention is the second aspect, wherein the support beams of adjacent component installation devices in the direction in which the space extends when viewed from above are connected by elongated members.

[0010] Here, the "long member" that connects the support beams of the component installation devices that are adjacent in the direction in which the space extends when viewed from above includes not only a member made of one member, but also a member made by connecting multiple members. The same applies to other descriptions in this application.

[0011] A fourth aspect of the component installation device of the present invention is any of the first to third aspects, in which the support beam is configured to be a steel beam having an upper flange, a lower flange, and at least one web connecting the upper flange and the lower flange.

[0012] A fifth aspect of the member installation device according to the present invention is any one of the first to fourth aspects, wherein the support beam is configured to be able to support a scaffolding by suspending it therefrom.

[0013] A sixth aspect of the component installation device according to the present invention is any one of the first to fifth aspects, wherein the hanging part is configured to have a center hole jack and a Gebindestarve.

[0014] A seventh aspect of the component installation device of the present invention is the fourth aspect, wherein the hanging part comprises a center hole jack and a Gebindestarve, and the Gebindestarve is inserted between the two webs.

[0015] An eighth aspect of the member installation device according to the present invention is any one of the first to fifth aspects, wherein the hanging portion is configured to include a wire and a wire clamp device.

[0016] A ninth aspect of the component installation device of the present invention is an aspect configured such that, in any of the first to eighth aspects, the bridge has an up line and a down line, and the space is the space between the superstructure of the up line and the superstructure of the down line.

[0017] A first aspect of the component installation method according to the present invention is a component installation method for installing a component using the component installation device of the first aspect, characterized in that it comprises an installation step of installing the component installation device of the first aspect so as to span the space between the superstructures of a bridge, a component hanging and support step of suspending and supporting the component on the component installation device installed in the installation step, and a component connecting step of connecting the component suspended and supported in the component hanging and support step to the bridge.

[0018] A second aspect of the component installation method according to the present invention is a component installation method according to the first aspect, which is configured such that the installation process is performed multiple times and multiple component installation devices of the first aspect are installed in the direction in which the space extends when viewed from above.

[0019] A third aspect of the component installation method of the present invention is a component installation method according to the second aspect of the component installation method, which is configured to include a connecting step of connecting the support beams of adjacent component installation devices in the direction in which the space extends as viewed from above using a long member, among the component installation devices installed in the direction in which the space extends as viewed from above.

[0020] A fourth aspect of the component installation method according to the present invention is a component installation method that is configured in any one of the first to third aspects of the component installation method, and that includes, prior to the component suspension support step, a scaffolding suspension support step in which scaffolding is suspended and supported by the component installation device installed in the installation step.

[0021] A fifth aspect of the component installation method according to the present invention is the component installation method of the fourth aspect, which is configured to include a removal step of removing a part of the superstructure of the bridge using the scaffolding suspended and supported in the scaffolding suspension and support step.

[0022] A sixth aspect of the component installation method according to the present invention is a component installation method that is configured in any one of the first to fifth aspects of the component installation method, wherein the bridge has an up line and a down line, and the space is the space between the superstructure of the up line and the superstructure of the down line. [Effects of the Invention]

[0023] According to the present invention, when a space is connected between the superstructures of a bridge in the bridge axis direction and components are to be installed in this space, it is possible to provide a component installation device and a component installation method in which the execution of construction is less affected by the width of the space. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view schematically showing a state in which a main girder block 70 is suspended by a member installation device 10 according to a first embodiment of the present invention. [Figure 2] 1 is a vertical cross-sectional view of a support beam 14 of a member installation device 10 according to a first embodiment of the present invention; [Figure 3] FIG. 1 is an enlarged perspective view showing a connection portion between the component installation device 10 according to the first embodiment of the present invention and the main girder block 70. [Figure 4] 4 is an enlarged front view taken in the direction of arrow IV in FIG. 3. [Figure 5] FIG. 10 is a plan view schematically showing a state in which a member installation device 20 according to a second embodiment of the present invention is viewed from above, in which a plurality of member installation devices 10 according to a first embodiment of the present invention are arranged in the direction in which a space 60 extends (the bridge axis direction of a bridge 100) when viewed from above. [Figure 6] Cross section of Figure 5 along line VI-VI [Figure 7] FIG. 10 is a side view schematically showing a state in which a member installation device 20 according to a second embodiment of the present invention is viewed from a direction perpendicular to the bridge axis of a bridge 100. [Figure 8] FIG. 1 is a schematic diagram showing one step (step S1) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 9]FIG. 1 is a schematic diagram showing one step (step S2) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 10] FIG. 1 is a schematic diagram showing one step (step S3) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 11] FIG. 10 is a schematic diagram showing one step (step S4) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 12] FIG. 1 is a schematic diagram showing one step (step S5) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 13] FIG. 10 is a schematic diagram showing one step (step S6) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 14] FIG. 10 is a schematic diagram showing one step (step S7) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 15] FIG. 10 is a schematic diagram showing one step (step S8) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 16] FIG. 10 is a schematic diagram showing one step (step S9) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 17] FIG. 1 is a schematic diagram showing one step (step S10) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 18] FIG. 1 is a schematic diagram showing one step (step S11) of a procedure for carrying out widening work (including related work) using the member installation device 10 according to the first embodiment of the present invention. [Figure 19] FIG. 1 is a diagram for explaining an outline of a hanging frame 300 described in Patent Document 1. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the description of the embodiment of the present invention, a case where a new steel girder is installed in the space between the superstructure of a bridge on the up line and the superstructure of a bridge on the down line will be taken up, but the application of the present invention is not limited to this case. For example, the present invention can also be applied to the installation of concrete girders, and also to the installation of superstructure members other than girders, such as deck slabs. Furthermore, the present invention can be applied not only to the installation of superstructure members, but also to the removal of superstructure members.

[0026] (1) First and Second Embodiments (1-1) Configuration Fig. 1 is a perspective view schematically showing a state in which a main girder block 70 is suspended by a member installation device 10 according to a first embodiment of the present invention, Fig. 2 is a vertical cross-sectional view of a support beam 14 of the member installation device 10 according to the first embodiment of the present invention, Fig. 3 is an enlarged perspective view of a connection portion between the member installation device 10 according to the first embodiment of the present invention and the main girder block 70, and Fig. 4 is an enlarged front view taken from the direction of arrow IV in Fig. 3. Fig. 5 is a plan view schematically showing a state in which a member installation device 20 according to a second embodiment of the present invention is viewed from above, in which a plurality of member installation devices 10 according to the first embodiment of the present invention are arranged in the direction in which a space 60 extends (the bridge axis direction of the bridge 100) as viewed from above, Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 5, and Fig. 7 is a side view schematically showing a state in which the member installation device 20 according to the second embodiment of the present invention is viewed from a direction perpendicular to the bridge axis of the bridge 100. In Fig. 1, for convenience of illustration, the connector 16C of the suspension part 16 is omitted, and in Fig. 5, for convenience of illustration, the part near the pier P2 is omitted. Also, in Fig. 2, the suspension part 16 and its components (center hole jack 16A and Gebinde Stab 16B) are shown with two-dot chain lines, and in Fig. 3, for convenience of illustration, some parts that would normally be drawn with hidden lines (dashed lines) are shown with solid lines. Also, in Fig. 6, the dashed line part labeled 80 is the added main girder, the dashed line part labeled 82 is the added cross girder, and the dashed line part labeled 84 is the widened deck slab.

[0027] The component installation device 20 according to the second embodiment of the present invention is a component installation device in which a plurality of component installation devices 10 according to the first embodiment of the present invention are arranged in the direction in which the space 60 extends (the bridge axis direction of the bridge 100). However, typically, a single component installation device 10 according to the first embodiment is not used alone, but rather, as shown in Figure 5, a plurality of component installation devices 10 are arranged in the direction in which the space 60 in which components are to be installed extends when viewed from above, and are used as the component installation device 20 according to the second embodiment.

[0028] 5, when widening work into space 60 is carried out using component installation devices 10, 20 according to an embodiment of the present invention, a predetermined area on the space 60 side must be designated as permanent work zones 102X, 104X, which are areas dedicated to construction, and typically requires approximately two lanes. Since the superstructures 102, 104 on both the inbound and outbound lanes of the bridge 100 on which widening work into space 60 is to be carried out using component installation devices 10, 20 according to an embodiment of the present invention have three lanes, during the construction period using component installation devices 10, 20, the two lanes on the space 60 side on both the inbound and outbound lanes are secured as areas dedicated to construction as permanent work zones 102X, 104X, and the remaining lane is used as a regular traffic lane 102Y, 104Y.

[0029] A component installation device 10 according to a first embodiment of the present invention comprises two columns 12, a support beam 14, and a suspension unit 16, and is arranged so that the support beam 14 straddles above the space 60 between the superstructures 102, 104 of a bridge 100, and components (such as main girder blocks 70) for widening the superstructures 102, 104 can be suspended and installed in the space 60. Because the support beam 14 of the component installation device 10 is arranged so that it straddles the space 60, construction using the component installation device 10 is less affected by the width of the space 60 in the width direction (the direction perpendicular to the bridge axis). Furthermore, the component installation device 10 and the component installation device 20, which is formed by arranging multiple component installation devices 10 in the direction in which the space 60 extends (the bridge axis direction of the bridge 100), can be used not only to suspend and support components (such as the main girder blocks 70) used for widening, but can also be used to suspend and support components to be removed during removal work (work to remove wall parapets and deck slabs that are part of the superstructures 102, 104) prior to the widening work.

[0030] The two columns 12 provided in the component installation device 10 according to the first embodiment are disposed on the upper structures 102, 104 so as to be positioned on opposite sides of the space 60 between the upper structures 102, 104, and support both ends of the support beam 14 from below, thereby supporting the support beam 14 at a predetermined height. As shown in FIG. 1 , the columns 12 each include a cylindrical column main body 12A, an upper flange 12B, a lower flange 12C, and a sandle 12D. The upper flange 12B is attached to the upper end of the column main body 12A by welding, and the lower flange 12C is attached to the lower end of the column main body 12A by welding. The sandle 12D is attached to the underside of the lower flange 12C with bolts (not shown), and the lower flange 12C is reinforced by the sandle 12D. The bottom flanges 12C and sandles 12D of the two column sections 12 are fixed to the superstructures 102, 104 with post-installed anchors (not shown). Both ends of the bottom flange 14C of the support beam 14 located above are attached to the top flanges 12B of the two column sections 12 with bolts. The shape of the column main body 12A is not limited to a cylindrical shape, and may be, for example, a square tube shape.

[0031] The support beam 14 is disposed perpendicular to the bridge axis of the bridge 100 so as to span above the space 60 between the superstructures 102, 104 of the bridge 100, and both ends are supported from below by the columns 12. A suspension part 16 is provided on the upper surface of the upper flange 14B of the support beam 14, and the support beam 14 is a member in which the suspension part 16 supports the load of the suspended member and transmits that load to the columns 12 located at both ends.

[0032] As shown in FIG. 6 , a hoisting device 30A for suspending scaffolding 30 can be connected to the support beam 14, and the support beam 14 can also be used to suspend the scaffolding 30. Therefore, the support beam 14 can be used not only for installing and removing components, but also for suspending the scaffolding 30 used in construction work. By using the component installation devices 10 and 20 for construction work, it is possible to eliminate the need for a vent below. Therefore, the component installation devices 10 and 20 are particularly suitable for use when the construction site is located below the sea or a river. In FIG. 6 , reference numerals 30B and 30C also denote hoists for suspending the scaffolding 30, but the hoisting device 30B is connected to the existing main girder of the superstructures 102 and 104, and the hoisting device 30C is connected to the existing cross girder of the superstructures 102 and 104.

[0033] As shown in Figure 2, the support beam 14 has two webs 14A, an upper flange 14B, and a lower flange 14C. The upper flange 14B is attached to the upper ends of the two webs 14A by welding, and the lower flange 14C is attached to the lower ends of the two webs 14A by welding, making the support beam 14 a two-web steel beam. The two webs 14A are arranged at a predetermined distance, and a space 14A1 is provided between the two webs 14A. The lower flange 14C of the support beam 14 is attached at both longitudinal ends to the upper flange 12B of the column portion 12 with bolts.

[0034] A center hole jack 16A of the suspension part 16 is provided on the upper surface of the upper flange 14B of the support beam 14, and the Gebindestarve 16B of the suspension part 16, which is gripped by the center hole jack 16A, is inserted vertically through the through holes 14B1 and 14C1 of the upper flange 14B and the lower flange 14C of the support beam 14, and the space 14A1 between the two webs 14A of the support beam 14. In the member installation device 10, the support beam 14 is made a two-web type beam having two webs so that the Gebindestarve 16B of the suspension part 16 can be inserted vertically through the support beam 14, but by making it a two-web type beam having two webs, the mechanical properties of the support beam 14 are also improved.

[0035] Furthermore, a through girder 18 (see FIG. 7) is connected to the upper surface of the upper flange 14B of the support beam 14 in the bridge axis direction of the bridge 100 at a position that does not interfere with the suspension part 16, and connects each member installation device 10 in the bridge axis direction of the bridge 100. Specifically, the through girder 18 is, for example, a long steel member with an H-shaped cross section, but it does not necessarily have to be made up of a single member, and may be made up of multiple members connected longitudinally to form a single member.

[0036] In this embodiment, as shown in FIG. 6 , two through girders 18 are provided on the upper surface of the upper flange 14B of the support beam 14. The through girders 18 are typically installed at positions corresponding to the positions of the hoists 30A that suspend the scaffolding 30. Providing the through girders 18 reduces the likelihood of each component installation device 10 tipping over in the bridge axis direction of the bridge 100. If safety can be ensured without providing the through girders 18, the through girders 18 are not necessarily required. Alternatively, it is possible to simply connect some adjacent component installation devices 10 together. However, since providing the through girders 18 improves safety, it is preferable to provide the through girders 18 to connect all component installation devices 10. The through girders 18 are used when multiple component installation devices 10 are installed on the superstructures 102, 104 of the bridge 100, and are used in the component installation device 20 according to the second embodiment, which includes multiple component installation devices 10. A hoisting device 30D (see FIG. 7) for suspending the scaffolding 30 can be connected to the through girder 18, and the through girder 18 can also be used to suspend the scaffolding 30. Note that, for convenience of illustration, the through girder 18 is omitted in FIG. 5.

[0037] The suspending unit 16 is a part that serves to suspend the members to be installed and removed so that they can be moved in the vertical direction. The suspending unit 16 has a center hole jack 16A and a Gebindestarve 16B, and the center hole jack 16A is provided on the upper surface of the upper flange 14B of the support beam 14.

[0038] The Gebinde Sturb 16B of the suspending unit 16 is inserted vertically through the through-holes 14B1 and 14C1 of the upper and lower flanges 14B and 14C of the support beam 14 and the space 14A1 between the two webs 14A of the support beam 14. It is held by a center hole jack 16A so that it can move vertically. This allows the vertical position of the object suspended and supported by the suspending unit 16 to be adjusted. As shown in Figures 3 and 4, a connector 16C is attached to the lower end of the Gebinde Sturb 16B. The connector 16C includes two opposing sidewall steel plates 16C1, an upper steel plate 16C2, a middle steel plate 16C3, two opposing lower steel plates 16C4, a connecting bolt 16C5, a fall prevention nut 16C6, and a fixing nut 16C7.

[0039] As shown in Figures 3 and 4, the sidewall steel plates 16C1 are elongated steel plates arranged so that their longitudinal direction is vertical, and two of them are provided parallel to each other with a predetermined gap between them. Opposing through-holes 16C1a, through which connecting bolts 16C5 are inserted, are provided in the lower parts of the two sidewall steel plates 16C1. As shown in Figures 3 and 4, an upper steel plate 16C2 is welded to the upper ends of the two opposing sidewall steel plates 16C1 so that its in-plane direction is horizontal, and a through-hole 16C2a, through which the Gebinde Sturb 16B is inserted, is provided in the center of the in-plane direction of the upper steel plate 16C2. A middle steel plate 16C3 is welded to the two opposing sidewall steel plates 16C1 slightly above near the center in the height direction so that its in-plane direction is horizontal, and a through-hole 16C3a through which the Gebindestarve 16B is inserted is provided in the center in the in-plane direction of the middle steel plate 16C3. A lower steel plate 16C4 is welded to the two opposing sidewall steel plates 16C1 slightly below near the center in the height direction on both side edges so as to face each other.

[0040] The Gevinde Sturb 16B is inserted through the through hole 16C2a of the upper steel plate 16C2 and the through hole 16C3a of the middle steel plate 16C3, and a fixing nut 16C7 is screwed onto the lower end of the inserted Gevinde Sturb 16B, fixing the fixing nut 16C7 to the underside of the middle steel plate 16C3. In this manner, the connector 16C is suspended and supported by the Gevinde Sturb 16B via the fixing nut 16C7 and the middle steel plate 16C3.

[0041] A connecting piece 72 for connecting to the suspension part 16 is welded to the upper surface of the upper flange 70A of the main girder block 70. The connecting piece 72 is provided with a through hole 72A through which a connecting bolt 16C5 is inserted.

[0042] When suspending the main girder block 70 with the suspending unit 16, the positions of the main girder block 70 and the connector 16C are finely adjusted so that the through-hole 72A of the connecting piece 72 and the through-holes 16C1a provided in the lower parts of the two sidewall steel plates 16C1 are aligned in a straight line. Then, the connecting bolt 16C5 is inserted through the through-holes 16C1a provided in the lower parts of the two sidewall steel plates 16C1 and the through-hole 72A of the connecting piece 72, and one end of the inserted connecting bolt 16C5 is fastened with the anti-disengagement nut 16C6. The anti-disengagement nut 16C6 prevents the connecting bolt 16C5 from coming loose when the suspending unit 16 is suspending an object, so it does not need to be tightened tightly.

[0043] As described above, the Gebindestarb 16B of the hanging part 16 is connected to the main girder block 70 via the connector 16C and the connecting piece 72, and the hanging part 16 can hang the main girder block 70.

[0044] As described above, the hanging section 16 of the component installation device 10 is configured with a center hole jack 16A and a Gebindestarve 16B, but the hanging section 16 is not limited to this configuration and may instead be configured with, for example, a wire clamp device and a wire.

[0045] (1-2) Installation procedure As described above, the member installation device 10 according to the first embodiment is configured to have two pillar portions 12, a support beam 14, and a suspension portion 16. The length of the support beam 14 depends on the width of the space 60 between the superstructures 102, 104 of the bridge 100 in the direction perpendicular to the bridge axis, but a length of approximately 15 m or less is usually sufficient for the support beam 14. Therefore, in normal cases, there is no need to divide the support beam 14 lengthwise for transportation, and the member installation device 10 can be delivered to the site in a pre-assembled state at a factory or the like. At the site, it is sufficient to simply install the member installation device 10, pre-assembled at a factory or the like, in the specified location using a crane truck 200, which saves time and effort in the installation work.

[0046] However, since the column portions 12 and the support beams 14 can be connected simply with bolts and the work of connecting the column portions 12 and the support beams 14 does not require much effort, the column portions 12 and the support beams 14 may be transported to the site in a separated state and the work of connecting the column portions 12 and the support beams 14 may be performed on site. Since more column portions 12 and support beams 14 in a separated state can be loaded onto one trailer, when installing a large number of component installation devices 10, it may be more cost-effective to transport the column portions 12 and the support beams 14 to the site in a separated state and perform the work of connecting the column portions 12 and the support beams 14 on site. Whether the component installation device 10 is transported to the site in a pre-assembled state at a factory or the like, or whether the column portions 12 and the support beams 14 are transported to the site in a separated state, can be selected appropriately depending on the situation.

[0047] (1-3) Component installation method 8 to 18 , a description will be given of widening work using a component installation device 20 according to a second embodiment of the present invention to install two additional main girders 80 in the space 60 between superstructures 102 and 104 of a bridge 100, including removal work (removal of the wall parapets and deck slabs on the widening side (space 60 side) that are part of the superstructures 102 and 104) prior to the widening work and installation work of the widening deck slab, etc., after the additional main girders 80 are installed. As described above, the component installation device 20 according to the second embodiment of the present invention is a component installation device in which a plurality of component installation devices 10 according to the first embodiment of the present invention are arranged in the direction in which the space 60 extends (the bridge axis direction of the bridge 100). Therefore, using the component installation device 20 according to the second embodiment of the present invention is equivalent to using the component installation device 10 according to the first embodiment of the present invention. In the description below, the column sections 12 and support beams 14 of the component installation device 10 are assumed to be transported to the construction site in a separate state.

[0048] 8 to 18, Figure A is a vertical cross-sectional view seen from a direction perpendicular to the bridge axis (cross-sectional view along line AA in Figure B) that schematically shows one stage of construction, and Figure B is a vertical cross-sectional view seen from the bridge axis direction (cross-sectional view along line BB in Figure A) that schematically shows one stage of construction. Furthermore, the parapet of the superstructure 102 is not depicted in Figure A of Figures 8 to 18, and piers P1 and P2 are not depicted in Figure B of Figures 8 to 18. In Figures 8 to 18, reference numeral 102A denotes the existing main girder of the superstructure 102, reference numeral 102B denotes the existing deck slab of the superstructure 102, reference numeral 104A denotes the existing main girder of the superstructure 104, and reference numeral 104B denotes the existing deck slab of the superstructure 104.

[0049] (Step S1) First, two columns 12 are placed at predetermined positions on the superstructures 102, 104 of the bridge 100 on which the additional main girder 80 is to be installed, sandwiching the space 60 between them. Then, a support beam 14 is placed so that both ends are positioned above the two placed columns 12, and connected to the columns 12 (the support beam 14 has hanging portions 16 pre-installed at predetermined positions). As a result, as shown in Figure 8, the member installation device 10 is placed above the superstructures 102, 104 so that the support beam 14 spans over the space 60.

[0050] (Step S2) Step S1 is repeated to place the required number of component installation devices 10 at predetermined positions on the superstructures 102, 104 in the direction in which the space 60 extends when viewed from above (the bridge axis direction of the bridge 100), and a component installation device 20 comprising a plurality of component installation devices 10 is installed on the superstructures 102, 104, as shown in Figure 9.

[0051] (Step S3) As shown in FIG. 10 , through girders 18 are installed on the upper surfaces of the support beams 14 so as to connect the support beams 14 of the multiple component installation devices 10 installed in step S2 in the bridge axis direction of the bridge 100. As shown in FIG. 10 , two through girders 18 are installed on the upper surfaces of the upper flanges 14B of the support beams 14 so that their longitudinal direction is in the bridge axis direction of the bridge 100 and corresponds to the position of the hoisting device 30A that suspends the scaffolding 30. By installing the through girders 18, each component installation device 10 is prevented from tipping over in the bridge axis direction of the bridge 100, improving the safety of the component installation device 20. Furthermore, the through girders 18 can also be used as components for suspending the scaffolding 30 by connecting hoisting devices for suspending the scaffolding 30 to them. In FIG. 10 to FIG. 15A, the through girders 18 are depicted by two-dot chain lines for convenience of illustration.

[0052] (Step S4) After the through girder 18 is installed in step S3, the scaffolding 30 is installed as shown in Fig. 11. The scaffolding 30 is suspended and supported using a hoisting device 30A connected to the support beam 14 and a hoisting device 30B connected to the existing main girders 102A and 104A.

[0053] (Step S5) After the scaffolding 30 is set up in step S4, the existing deck slab and existing wall parapet are removed from the widening side (space 60 side) of the superstructures 102, 104 of the bridge 100, as shown in Figure 12. With the existing deck slab and existing wall parapet to be removed supported by the component installation device 20, the existing deck slab and existing wall parapet to be removed can be detached from the superstructures 102, 104 at predetermined positions, allowing the removal work to proceed safely.

[0054] (Step S6) In step S5, the existing deck slab and existing wall parapet are removed from the widening side (space 60 side) of the superstructures 102, 104 of the bridge 100, and then the main girder block 70 used to widen into the space 60 is suspended and supported by the component installation device 20. The main girder block 70 is erected from the pier P1 side, as shown in Figure 13. The main girder block 70 to be erected first is lifted by the crane truck 200 (see Figures 6 and 7) and one end is placed on the support of the pier P1. While still suspended and supported by the crane truck 200, the portion of the main girder block 70 located directly below the suspending part 16 of the component installation device 10 closest to the pier P1 is suspended and supported by the suspending part 16 of the component installation device 10. Once the first main girder block 70 has been suspended and supported by the suspension section 16 of the component installation device 10 closest to the pier P1, the suspension support by the crane truck 200 is released and the crane truck 200 is moved to a position corresponding to the second main girder block 70 to be erected next.

[0055] (Step S7) In step S6, the first main girder block 70 closest to pier P1 is suspended and supported by the component installation device 10, and the crane vehicle 200 is moved to a point corresponding to the second main girder block 70 to be erected next. The second main girder block 70 to be erected next is then suspended and supported by the crane vehicle 200 in a predetermined position (a position adjacent to the first main girder block 70 in the bridge axis direction), and in this state, one end of the second main girder block 70 is connected with a splice plate to one end of the first main girder block 70 already suspended and supported by the component installation device 10, and the portion of the second main girder block 70 located directly below the suspension part 16 of the component installation device 10 second closest to pier P1 is suspended and supported by the suspension part 16 of the component installation device 10. The state at this time is shown in Figure 14. Once the second main girder block 70 has been suspended and supported by the suspension section 16 of the component installation device 10 that is second closest to the pier P1, the suspension support by the crane truck 200 is released and the crane truck 200 is moved to a location corresponding to the third main girder block 70 to be erected next.

[0056] (Step S8) Step S7 is repeated to erect the required number of main girder blocks 70, and one end of the additional main girder 80 formed by connecting the required number of main girder blocks 70 reaches pier P2, as shown in Figure 15. Figure 15 shows the state in which both ends of the additional main girder 80 are supported by supports (not shown) on piers P1 and P2, and shows the state in which the erection of the additional main girder 80 is completed.

[0057] (Step S9) After completing the erection of the additional main girder 80 in step S8, as shown in Figure 16, the member installation device 20 is removed, all member installation devices 10 are removed, and a hoisting device 30E is attached to the additional main girder 80 whose erection has been completed, and the scaffolding 30 is suspended by the hoisting device 30E. When all member installation devices 10 are removed in this step S9, all of the hoisting devices 30A supported by the member installation devices 10 are also removed. Therefore, a new hoisting device 30E is attached to the additional main girder 80 whose erection has been completed, and the scaffolding 30 is suspended by the hoisting device 30E instead of the hoisting device 30A, and the scaffolding 30 is suspended by the hoisting device 30B and the hoisting device 30E.

[0058] (Step S10) After all component installation devices 10 are removed in step S9, the scaffolding 30 suspended by the hoisting devices 30B and 30E is also utilized to install widening components such as the widening deck 84 in the space 60, as shown in Figure 17, thereby completing the widening of the bridge 100 toward the space 60.

[0059] (Step S11) After completing the widening of the bridge 100 toward the space 60 in step S10, the scaffolding 30 is removed as shown in FIG. 18, and the widening work on the bridge 100 is completed.

[0060] (2) Supplementary information In the embodiment described above, a two-web type steel beam having two webs is used as the support beam 14, but instead of using a two-web type steel beam, it is also possible to use two parallel standard type steel beams having one web, in which case the Gebindestarve 16B of the hanging part 16 is configured to pass vertically through the space between the webs of the two parallel standard type steel beams.

[0061] In addition, the embodiment described above deals with the case where two newly added main girders 80 are installed in the space 60 between the upper and lower superstructures 102, 104 of the bridge 100, and as shown in Figure 6, the explanation has been given on the assumption that construction will be carried out by placing one crane truck 200 on each of the upper and lower superstructures 102, 104 of the bridge 100.However, if the weight of the main girder block 70 is not large, it may be possible to carry out the work by simply placing the crane truck 200 on only one of the upper and lower lines by extending the arm of the crane truck 200.

[0062] Furthermore, while Figure 6 depicts the space 60 as having a constant width (width perpendicular to the bridge axis) as viewed from above, the present invention is applicable even if the width (width perpendicular to the bridge axis) of the space 60 as viewed from above is not constant. When the width (width perpendicular to the bridge axis) of the space 60 as viewed from above is not constant, it is possible to address this by, for example, changing the length of the support beam 14. Therefore, the present invention can flexibly accommodate the width (width perpendicular to the bridge axis) of the space 60 as viewed from above. When a space is connected between the superstructures of a bridge in the bridge axis direction and the present invention is used to install components in this space 60, the width of the space 60 is less likely to affect the implementation of the construction work. However, if the distance between the columns 12 supporting the support beam 14 changes, the magnitude of the bending moment applied to the support beam 14 when the target component is suspended and supported also changes. Therefore, the cross-sectional shape of the support beam 14 (such as the thickness of the upper flange 14B and the lower flange 14C) must also be changed as necessary.

[0063] Furthermore, the present invention is not limited to applications only when widening a superstructure in a space that already exists between superstructures of a bridge, but can also be applied, for example, when installing new main girders or new deck slabs in the space created by removing part of the existing main girders or existing deck slabs in order to renovate part of the superstructure of a bridge. It can also be applied to cases where vertical girders are placed between the existing main girders after removing the existing deck slabs so that vertical girders can be placed from above. [Explanation of symbols]

[0064] 10, 20...Component installation device 12...Column part 12A…Column body part 12B...Top flange 12C...Lower flange 12D...Sandor 14…Support beam 14A…Web 14A1…Space 14B...Top flange 14C...Bottom flange 14B1, 14C1...Through hole 16...Hanging part 16A...Center hole jack 16B…Gebindestarb 16C…Connector 16C1…Side wall steel plate 16C2…Upper steel plate 16C3…Middle stage steel plate 16C4…lower steel plate 16C5...Connecting bolt 16C6...Captive nut 16C7...Fixing nut 16C1a, 16C2a, 16C3a...Through hole 18...Through beam 30...Scaffolding 30A, 30B, 30C, 30D, 30E... Lifting equipment 60…Space 70...Main girder block 70A...Top flange 72...Connecting piece 72A…Through hole 80...Additional main girder 82...Additional cross beam 84...Wide deck 100...Bridge 102, 104...superstructure 102A, 104A...Existing main girders 102B, 104B...Existing deck 102X, 104X...Permanent work zones 102Y, 104Y... Regular driving lanes 200...Crane truck 300...hanging frame 302...First leg 304... Support beam 310...Additional main girder 400...Existing steel bridge 402...Existing girder

Claims

1. A member installation device for installing members in a space between superstructures of a bridge, each of which has a deck and a main girder, two pillars arranged on the superstructure of the bridge so as to sandwich the space therebetween when viewed from above; a support beam disposed so as to span above the space and supported by the two pillars; a first suspending portion attached to the support beam within a range located above the space and suspending and supporting the member to be installed so that the member can be raised and lowered; A second suspending portion is attached to a position different from the first suspending portion within a range located above the space of the support beam and suspends and supports a scaffolding located below the main girder of the superstructure; A component installation device comprising:

2. 2. A member installation device comprising a plurality of member installation devices according to claim 1 arranged in a direction in which the space extends as viewed from above.

3. The member installation device according to claim 2, characterized in that the support beams of the member installation devices adjacent to each other in the direction in which the space extends when viewed from above are connected by elongated members.

4. A component installation device according to any one of claims 1 to 3, characterized in that the support beam is a steel beam having an upper flange, a lower flange, and at least one web connecting the upper flange and the lower flange.

5. 4. The member installation device according to claim 1, wherein the suspension unit comprises a center hole jack and a Gebindestarve.

6. 5. The member installation device according to claim 4, wherein the hanging portion comprises a center hole jack and a Gebinde Stab, and the Gebinde Stab is inserted between the two webs.

7. 4. The member installation device according to claim 1, wherein the hanging portion comprises a wire and a wire clamp device.

8. 4. A component installation device according to claim 1, wherein the bridge has an up line and a down line, and the space is a space between a superstructure of the up line and a superstructure of the down line.

9. A component installation method for installing components using a component installation device for installing components in the space between superstructures of a bridge, each of which has a deck and a main girder, the component installation method comprising: two pillars arranged on the superstructure of the bridge so as to sandwich the space when viewed from above; a support beam supported by the two pillars arranged to straddle the space above; and a hanging part attached to the support beam within a range above the space and for suspending and supporting the component to be installed so that it can be raised and lowered, an installation process of installing the member installation device so that the support beam spans a space between superstructures of a bridge; a scaffolding suspension and support process for suspending and supporting a scaffolding on the support beam of the member installation device installed in the installation process so that the scaffolding is positioned below the superstructure; a superstructure removal step of removing a part of the superstructure using the scaffolding supported in the scaffolding suspension support step; a member suspending and supporting step of suspending and supporting the member by the suspending portion of the member installation device installed in the installation step; a member connecting step of connecting the members suspended and supported in the member suspension and support step to the bridge after the superstructure removal step; A component installation method comprising the steps of:

10. 10. The member installation method according to claim 9, wherein the installation step is performed a plurality of times to install a plurality of member installation devices according to claim 1 in the direction in which the space extends as viewed from above.

11. The component installation method according to claim 10, characterized in that it includes a connecting step of connecting the support beams of adjacent component installation devices in the direction in which the space extends when viewed from above using a long member, among the component installation devices installed in the direction in which the space extends when viewed from above.

12. 12. A component installation method according to any one of claims 9 to 11, characterized in that the bridge has an up line and a down line, and the space is a space between a superstructure of the up line and a superstructure of the down line.

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