JP7258664B2 - Work scaffold and flange installation member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work scaffold installed on a steel main girder that constitutes a bridge, and a flange installation member used for the work scaffold.

Traditionally, in bridge construction where concrete floor slabs are constructed on main girders, work space is secured by constructing scaffolding between the main girders. For example, the prior art of Patent Document 1 discloses a configuration in which a lower scaffold is installed between the lower flanges of two rows of main girders, and an inter-girder intermediate scaffold is installed at an intermediate position of the web of the main girder. .

Japanese Patent Application Laid-Open No. 2002-21022

Patent Literature 1 discloses only the lower scaffolding and the intermediate scaffolding between girders, as described above, because the work scaffolding is installed in relation to the installation of the concrete floor slab formwork. However, in bridge slab replacement work to remove and replace the existing slab of a road bridge that has deteriorated over time, an upper scaffolding is installed at a height position near the upper flange of the main girder.

In other words, remnants of the removed existing floor slab, such as concrete shavings and anchor reinforcing bars, often adhere to the upper surface of the main girder exposed after the existing floor slab has been removed. For this reason, before installing the new floor slabs, scaffolding will be installed between the main girders, and scraping work will be performed to remove debris from the upper surface of the main girders using a disk sander or grinder.

If the lower scaffolding, the intermediate scaffolding between the girders, and the upper scaffolding are to be installed at heights corresponding to the work content, a frame supporting the scaffolding board must be constructed for each of the three scaffoldings. In the narrow space between the main girders, the work of assembling while avoiding mutual interference tends to be complicated. In addition, the frame supporting these scaffolding boards is generally assembled by connecting a plurality of single-pipe supports using clamps of various shapes. .

The present invention has been made in view of such problems, and its main purpose is to provide a work scaffold that can be quickly assembled with a simple structure, and a flange installation member used for the work scaffold.

In order to achieve such an object, the work scaffold of the present invention is a work scaffold installed on a steel main girder constituting a bridge and comprising a scaffold board and a support frame for supporting the scaffold board, wherein the support frame is provided with an axial member arranged to extend in the axial direction, and a flange installation member installed on the lower flange of the main girder, and the end of the axial member is connected A member is installed, and the flange installation member is provided with a plurality of couplings that are coupled to the member to be coupled, and the plurality of couplings are arranged in the bridge axis direction.

According to the working scaffolding of the present invention, a plurality of connectors are installed on the flange installation member, and the connected members are installed on the bridge axis direction member. As a result, the installation reference point of the work scaffold is set in advance on the lower flange of the main girder, and the flange installation members are installed prior to this position so that the multiple connectors face the bridge axis direction. It is possible to perform the positioning and installation work of the subsequent flange installation member while measuring the distance using the bridge axial direction member instead of a ruler.

In addition, it is possible to easily connect these by simply installing the connected members of the bridge axis direction members to the connecting devices of the flange installation members installed on the main girders in the leading and trailing directions, thereby improving the efficiency of the scaffold assembly work. It is possible to greatly improve the conversion rate.

In the working scaffolding of the present invention, the support structure further includes a bridge-axis orthogonal direction member arranged to extend in the bridge axis-orthogonal direction, and the connected member is provided at an end of the bridge axis-orthogonal direction member. It is characterized in that a plurality of the connectors are arranged in each of the bridge axis direction and the bridge axis orthogonal direction on the flange installation member.

According to the work scaffolding of the present invention, a work scaffold that bridges between main girders can be quickly installed with a small number of workers by using the flange installation member, the bridge axis direction member, and the bridge axis orthogonal direction member. It is possible to shorten the construction period, reduce construction costs, and improve safety in assembling scaffolds.

The work scaffolding of the present invention further comprises a column pipe in which the support frame is erected in parallel with the web of the main girder and a plurality of the connectors are installed on the side surface, and the flange installation member is attached to the column A plurality of connectors installed on the support pipes are arranged in the direction of the bridge axis and the direction perpendicular to the bridge axis at the planned installation height positions of the scaffolding boards. characterized by being

According to the work scaffolding of the present invention, since the support frame further includes the support pipe, the support frame can be increased in the height direction. Therefore, it is necessary to install a connector at the height position where you want to place the scaffolding boards of the middle scaffolding and the upper scaffolding on the support pipe, and use this connector to install the bridge axis direction member and the bridge axis direction member. As a result, the support frame for the middle scaffolding between girders and the upper scaffolding can be used together without separate assembly. Therefore, it is possible to greatly improve the work efficiency when assembling work scaffolds having different heights corresponding to the work content, in accordance with the progress of the work related to the bridge.

The flange installation member of the present invention is a flange installation member used in the work scaffold of the present invention, comprising a connecting pipe erected in parallel with the web of the main girder and provided with a plurality of the connectors, and a connecting pipe fixed to the connecting pipe. and a flange gripping member for gripping the lower flange of the main girder, the flange gripping member comprising a clamp having a tightening bolt located on the underside of the lower flange.

According to the flange installation member of the present invention, the flange gripping member is composed of a clamp, and the tightening bolt is arranged on the lower side of the lower flange. Also, the workability when operating the tightening bolt is good, and it is possible to easily grip the lower flange of the main girder.

Further, by arranging the tightening bolts on the lower side of the lower flange, the load of the work platform is not transmitted to the tightening bolts, and the lower flange can be held stably.

In addition, since the bridge axis direction member, bridge axis direction member, and support pipe can be directly installed on the flange installation member, there is no need to use separate metal fittings such as clamps, so the number of parts can be greatly reduced, making it economical In addition, it is possible to reduce the weight of the work scaffold itself.

The flange installation member of the present invention is characterized in that the flange gripping member is provided with a plurality of the clamps, and the plurality of clamps are arranged on both sides of the connecting pipe in the bridge axis direction. .

According to the flange installation member of the present invention, by installing a plurality of clamps, it becomes possible to disperse and support the load acting on the connecting pipe when the working scaffold is assembled. In addition, by arranging these multiple clamps on both sides in the bridge axis direction around the connecting pipe, it is possible to stably support the connecting pipe even when an external force acts on the connecting pipe in the horizontal direction as well as in the vertical direction. becomes possible.

According to the present invention, the support structure on which the scaffolding boards are supported consists of the bridge axial direction member having the connected member at the end and the lower flange of the main girder provided with a plurality of connectors connected to the connected member. and a flange installation member to be installed, the bridge axis direction member can be easily connected to the flange installation member installed on the main girder, and the work scaffold can be quickly assembled with a simple configuration.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline of the working scaffold installed between the main girders of the bridge in embodiment of this invention. It is a figure which shows the work scaffold which installed the scaffolding board in the lower flange vicinity height of the main girder in embodiment of this invention. It is a figure which shows the side surface of the work scaffold which installed the scaffolding board in the lower flange vicinity height of the main girder in embodiment of this invention. It is a figure which shows the connection structure of the bridge-axis direction member, bridge-axis orthogonal member, and a flange installation member in embodiment of this invention. It is a figure which shows the detail of the flange installation member in embodiment of this invention. It is a figure which shows the working scaffold which installed the scaffolding board in the intermediate height of the main girder in embodiment of this invention. It is a figure which shows the working scaffold which installed the scaffolding board in the vicinity height of the upper flange of the main girder in embodiment of this invention. It is a figure (the 1) which shows the assembly procedure of the working scaffold in embodiment of this invention. It is a figure (2) which shows the assembly procedure of the working scaffold in embodiment of this invention. It is a figure (the 3) which shows the assembly procedure of the working scaffold in embodiment of this invention. It is a figure which shows the outline of the working scaffold installed in the edge part of the bridge in embodiment of this invention.

INDUSTRIAL APPLICABILITY The work scaffold and the flange installation member used for the work scaffold of the present invention are suitable for use in the construction of a bridge in which steel girders made of I-shaped steel are adopted for the main girder. Details of the working scaffold and flange mounting member of the present invention will be described below with reference to FIGS. 1 to 11. FIG.

As shown in FIG. 1, the work scaffolding 1 installed between the adjacent main girders 50 of the road bridge B is composed of scaffolding boards 2 for workers to come and go, and a support frame 3 that supports the scaffolding boards 2. The scaffolding board 2 can be installed at various height positions according to the contents of the work.

In the present embodiment, the height of the main girder 50 is large in the case of use for the floor slab replacement work of the highway bridge B, and as the work progresses, the scaffolding plate 2 increases in height near the lower flange 501 of the main girder 50. A case where it is necessary for three height positions of P1, intermediate height P2 of the main girder 50, and height P3 near the upper flange of the main girder 50 will be described below in detail.

<<When scaffolding boards are installed at height P1 near the lower flange of the main girder>>
The work scaffolding 1 shown in FIGS. 2 and 3 is a case where the scaffolding board 2 is installed at a height P1 near the lower flange 501 of the main girder 50. It is composed of a fitting 9, a horizontal pipe 10 which is a bridge axial member, and a flange installation member 4 arranged at the interface between these axial direction members and the bridge axial member.

<Bridge perpendicular direction member and bridge direction member>
As shown in FIG. 3, the horizontal member 8 is a member perpendicular to the bridge axis that is arranged so as to span the adjacent main girders 50. , and a pair of end members 82 that are connected to each other.

The beam member 81 has an upper chord member 811 and a lower chord member 812 formed into hollow tubular members, and the end member 82 includes an upper pipe 821 that can be retracted from the upper chord member 811 of the beam member 81 and a lower chord member 812 that can be retracted. A lower pipe 822 is provided. The end member 82 can be appropriately slid on the beam member 81 to appear and retract, and functions as a length adjusting member for the horizontal member 8 .

The pair of end members 82 arranged at both ends of the beam material 81 may both function as the length adjusting members of the horizontal member 8, but only one of them may function and the other end may function. The member 82 may be non-slidably fixed to the beam member 81 .

In addition, the end member 82 has an upper pipe 821 and a lower pipe 822 which are connected via a connecting member 823 arranged orthogonally to these pipes, and interlocks when sliding. Further, the end members 82 can be fixed to the beams 81 so that the horizontal member 8 is adjusted to the desired member length and the member length is maintained.

As shown in FIG. 3, the butting fitting 9 is a member perpendicular to the bridge axis that is arranged between the web 503 of the main girder 50 and the flange installation member 4, and has a cylindrical female screw member 91 and a female screw member A male threaded rod 92 screwed to the male threaded rod 91 and a pressing member 93 attached to the tip of the male threaded rod 92 are provided. The female screw member 91 is arranged so that its axis forms the same straight line as the axis of the upper chord member 811 forming the beam member 81 of the horizontal member 8 , and one end is connected to the flange installation member 4 . A female screw (not shown) is formed on the other end, so that the male screw rod 92 screwed into this female screw functions as a length adjusting member for the abutment fitting 9 .

As a result, the member length of the abutting metal fitting 9 is adjusted, and the pressing member 93 attached to the distal end of the male threaded rod 92 can be abutted against the web 503 . The pressing member 93 has a smooth surface facing the web of the main girder 50 , so that the external force acting from the abutment fitting 9 can be applied smoothly to the web 503 of the main girder 50 via the pressing member 93 . introduce.

The horizontal pipe 10, as shown in FIG. 2, is a bridge axial direction member extending parallel to the extending direction of the main girder 50 and is made of a hollow pipe. At both ends thereof, members 11 to be connected are installed as shown in FIG.

The connected member 11 installed on the horizontal pipe 10 has a similar shape and is attached to the end portion of the upper pipe 821 in the end member 82 of the horizontal member 8 and to one end of the female screw member 91 that constitutes the abutting metal fitting 9. is also installed.

<Flange installation member>
The flange installation member 4 and the connector 14 and the connected member 11 formed on the flange installation member 4 will be described below.

As shown in FIG. 3, the flange installation member 4 is a pipe-shaped connecting pipe 5 erected parallel to the web 503 of the main girder 50, and is fixed to the connecting pipe 5 to grip the lower flange 501 of the main girder 50. The flange gripping member 6 includes a connecting member 61 and a plurality of clamps 62 connected via the connecting member 61 .

As the clamp 62, as shown in FIG. 5, any so-called fastener capable of gripping the lower flange 501 of the main girder 50 may be adopted. is employed. Two clamps 62 are arranged in parallel in the bridge axis direction with the tightening bolts 621 arranged below the lower flange 501. They are connected by a connecting material 61 .

By arranging the tightening bolt 621 of the clamp 62 below the lower flange 501 in this way, when the lower flange 501 of the main girder 50 is positioned near the operator's line of sight, the tightening bolt 621 can be operated easily. Workability is good, and it is possible to easily install the flange installation member 4 on the lower flange 501 of the main girder 50 . Further, by arranging the tightening bolts 621 on the lower side of the lower flange 501, the load of the work platform 1 is not transmitted to the tightening bolts 621, so that the lower flange 501 can be held stably. .

Furthermore, in this embodiment, two clamps 62 are used to disperse and support the load acting on the connecting pipe 5 when the work scaffold 1 is assembled. The pipes 5 are arranged on both sides in the direction of the bridge axis to stably support the connecting pipes 5 even when an external force acts on the connecting pipes 5 in the horizontal direction as well as in the vertical direction. The number of clamps 62 is not limited to two, and any number of clamps may be used as long as an equal number of clamps are arranged on both sides of the connecting pipe 5 in the bridge axis direction.

On the other hand, as shown in FIGS. 4 and 5, the connecting pipe 5 is made of a hollow pipe similar to the horizontal pipe 10, and has an auxiliary member 71 and a reinforcing member 72 for stably fixing the flange gripping member 6 on the side surface. , a horizontal member 8, an abutment fitting 9, and a connector 14 formed to be connectable with a member to be connected 11 installed at the end of the horizontal pipe 10. As shown in FIG.

The auxiliary member 71 is a flat plate member used to form the installation surface of the flange gripping member 6 on the side surface of the connecting pipe 5, and has the back surface fixed to the connecting pipe 5 and the flange gripping member 6 fixed to the front surface. Further, the reinforcing member 72 is a rib arranged between the side surface of the auxiliary member 71 and the upper end portion of the connecting material 61 constituting the flange gripping member 6, and has a function of suppressing deformation of the connecting material 61. there is

The connector 14 is a metal fitting with a U-shaped cross section, and by fixing the opening side of the U-shape to the side surface of the connecting pipe 5, it penetrates in a direction parallel to the axis of the connecting pipe 5. A vertical hole 141 through which the connected member 11 can be inserted is formed. In this embodiment, four connectors 14 are used as one set, and as shown in FIG. It is installed on the side surface of the connecting pipe 5 so that it is arranged at the expected height P1 near the lower flange 501 of the main girder 50 and at the position facing the bridge axis direction and the bridge axis orthogonal direction.

On the other hand, as shown in FIG. 4, the member to be connected 11 includes an insertion portion 12 inserted into a vertical hole 141 of the connector 14 and a removal preventing member 13 for preventing the insertion portion 12 inserted into the vertical hole 141 from being removed. Prepare.

The insertion portion 12 is formed of a rod-shaped member having an external shape that contacts the inner peripheral surface of the vertical hole 141 and having a member length sufficiently longer than the depth of the vertical hole 141 when inserted into the vertical hole 141 . Looking at the horizontal pipe 10 , for example, the insertion portion 12 is arranged so that its longitudinal direction is perpendicular to the longitudinal direction of the horizontal pipe 10 , and its base end is installed at the end of the horizontal pipe 10 .

As a result, when the member to be connected 11 is inserted into the vertical hole 141 of the connector 14 from the tip of the insertion portion 12 in a posture in which the member to be connected 11 hangs down from the horizontal pipe 10, the insertion portion 12 passes through the vertical hole 141, A horizontal pipe 10 is connected to the flange mounting member 4 .

An opening 121 is formed on the side surface of the insertion section 12 between the distal end of the insertion section 12 and the lower end of the vertical hole 141 when the insertion section 12 is inserted into the vertical hole 141 . A pull-out preventing tool 13 is housed in the insertion part 12 so as to be freely retractable.

The pull-out prevention tool 13 includes a wedge member 131 that appears and disappears from an opening 121 provided in the insertion portion 12, a rotating shaft pin 132 that connects one end of the wedge member 131 and the insertion portion 12, and the other end of the wedge member 131 that is inserted. and a biasing member (not shown) such as a spring interposed between it and the portion 12 . One end of the wedge member 131 is arranged on the distal end side of the insertion section 12 and the other end is arranged on the proximal end side of the insertion section 12 .

In the connected member 11 having such a structure, normally, the other end of the wedge member 131 of the pull-out prevention tool 13 protrudes from the side surface of the insertion part 12, and the cross section is larger than the vertical hole 141 of the connection tool 14. The wedge member 131 is accommodated in the insertion portion 12 by inserting the wedge member 12 into the vertical hole 141 . However, the wedge member 131 protrudes again after passing through the vertical hole 141, and when the insertion portion 12 is pulled out from the vertical hole 141, the wedge member 131 maintains the state of protruding from the insertion portion 12, preventing the insertion portion 12 from coming off. do.

The above-described connected members 11 are installed at both ends of the upper pipe 821 constituting the end member 82 in the horizontal member 8, the longitudinal direction of the insertion portion 12 is orthogonal to the axis of the upper pipe 821, and The pull-out preventers 13 are arranged so as to face each other.

In addition, the abutting metal fitting 9 is provided with the connected member 11 at one end of the female screw member 91. It is arranged so as to face a pressing member 93 attached to the tip of the male threaded rod 92 .

Therefore, as with the horizontal pipe 10, the horizontal member 8 and the abutment fitting 9 can be inserted into the vertical hole 141 of the connector 14 from the tip of the insertion portion 12 in a posture in which the member 11 to be connected is suspended. is connected to the flange mounting member 4 by . As a result, the horizontal members 8, the abutment fittings 9, and the horizontal pipes 10 are connected to each other at a height P1 near the lower flange 501 of the main girder 50 via the flange installation member 4, and the scaffolding plate 2 as shown in FIG. becomes a support frame 3 that supports the .

<<When scaffolding boards are installed at the middle height P2 of the main girder and the height near the upper flange P3>>
Next, the support frame 3 when the scaffolding board 2 is installed at the middle height P2 of the main girder 50 and the upper flange vicinity height P3 of the main girder 50 as shown in FIG. 1 will be described.

The working scaffold 1 shown in FIGS. 6(a) and 6(b) is a case where the scaffolding board 2 is installed at the intermediate height P2 between the girders of the main girder 50, and the working scaffolding 1 shown in FIG. , is installed at a height P3 near the upper flange of the main girder 50. These support frames 3 are composed of the above-described horizontal members 8 , abutting metal fittings 9 , horizontal pipes 10 , flange installation members 4 , and column pipes 15 .

<Strut pipe>
As shown in FIG. 6B, the strut pipe 15 is a strut arranged to stand parallel to the web 503 of the main girder 50 via the flange installation member 4. It is formed to the same extent as the girder, and its material is a hollow pipe similar to the connecting pipe 5 of the flange installation member 4 . Further, as shown in FIG. 5 , a reduced diameter portion 151 is formed at one end of the support pipe 15 .

Therefore, the upper end portion of the connecting pipe 5 and the support pipe 15 can be connected by inserting the reduced diameter portion 151 of the support pipe 15 into the upper end opening of the connecting pipe 5 . Therefore, the support pipe 15 is added to the support frame 3 assembled with the main girder 50 using the flange installation member 4 in order to install the scaffold board 2 at the height P1 near the lower flange 501 of the main girder 50. It can be used in any aspect.

Further, on the support pipe 15, a plurality of sets of four connecting tools 14 are installed at intervals in the height direction. These four connectors 14 are installed at positions facing the bridge axis direction and the bridge axis orthogonal direction in a state where the support pipe 15 is connected to the flange installation member 4 installed on the lower flange 501 of the main girder 50. ing.

The combination of these four connectors 14 may be installed at regular intervals, such as 50 cm intervals, for example, and the intermediate height P2 of the main girder 50, which is the planned installation height of the scaffold board 2, and the main girder 50 may be installed at a height P3 near the upper flange.

By doing this, the support frame 3 assembled to install the scaffold board 2 at the height P1 near the lower flange 501 of the main girder 50 is added with the support pipe 15, and the connector 14 installed on the support pipe 15 is used. Then, new horizontal members 8, abutting fittings 9, and horizontal pipes 10 can be connected to extend the support frame 3 in the height direction.

In this way, the support frame 3 assembled to install the scaffolding board 2 at the height P1 near the lower flange 501 of the main girder 50 is set at the middle height P2 of the main girder 50 and the height near the upper flange 50 of the main girder 50. P3 can also be used as a support frame 3 for installing scaffolding boards 2, and work efficiency is greatly improved when assembling work scaffolds 1 with different heights corresponding to the work contents at each construction stage related to the bridge. It becomes possible to

≪Assembly of work scaffolding≫
Next, corresponding to the progress of the floor slab replacement work of the highway bridge B, the height P1 near the lower flange 501 of the main girder 50, the middle height P2 of the main girder 50, and the height near the upper flange of the main girder 50 The procedure for assembling the work scaffold 1 with the scaffold board 2 installed on the side P3 will be described below.

As shown in FIG. 8( a ), prior to carrying out the work of assembling the work scaffold 1 between the adjacent main girders 50 , the work scaffold 1 is placed on the lower flange 501 of each main girder 50 in advance at the construction planning stage. Installation reference points A and A' are set, and the flange installation member 4 is installed at each of these installation reference points A and A'.

As shown in FIG. 5, the flange installation member 4 is arranged such that the connecting pipe 5 is erected in parallel with the web of the main girder 50, and the vertical holes 141 of the couplings 14 are arranged in the bridge axis direction and the bridge axis orthogonal direction, respectively. The flange gripping member 6 is used to grip the lower flange 501 as directed.

Next, as shown in FIG. 8(b), on the lower flange 501 of one of the main girders 50, the horizontal pipe 10 is used as a ruler with reference to the previously installed flange installation member 4, The flange installation member 4 to be installed subsequently is positioned. As a result, the flange installation members 4 can be arranged at equal intervals in the bridge axis direction without performing the measurement work, and the work efficiency can be greatly improved.

The flange installation member 4 thus positioned is installed on the lower flange 501 and the horizontal pipe 10 is connected. The horizontal pipe 10 is set in a posture in which the connected members 11 installed at both ends hang down, and is inserted into the vertical holes 141 of the couplings 14 installed in the bridge axis direction installed in each of the adjacent flange installation members. , the insertion portion 12 of the member to be connected 11 is inserted from above. Similarly, the lower flange 501 of the other main girder 50 is also subjected to the same work.

Simultaneously with or before or after the work of connecting the horizontal pipes 10, which are the members in the bridge axis direction, the work of connecting the bridge axis orthogonal direction members is performed. In other words, the horizontal members 8 are connected so as to span the flange installation members 4 installed on each of the adjacent main girders 50 .

As described above, the horizontal members 8 are arranged so that the members to be connected 11 installed at both ends hang down, and the connecting tools 14 installed in each of the flange installation members 4 are installed in the direction orthogonal to the bridge axis. The insertion portion 12 of the member to be connected 11 is inserted from above into the vertical hole 141 of . At this time, if the member length of the horizontal member 8 is insufficient, the end members 82 are appropriately slid against the beam member 81 to adjust the length.

Moreover, the abutment metal fittings 9 are connected to each of the flange installation members 4 . In the vertical hole 141 of the connector 14 installed in each of the flange installation members 4 installed in the direction perpendicular to the bridge axis, The insertion portion 12 of the member to be connected 11 is inserted from above.

After that, the male threaded rod 92 of the butting fitting 9 is rotated as appropriate to adjust the amount of protrusion from the female threaded member 91, and the pressing member 93 is pushed until a predetermined pressing force acts on the web 503 of the main girder 50. guess.

The operation of connecting the horizontal members 8, the abutting metal fittings 9, and the horizontal pipes 10 through the flange installation members 4 is performed in sequence according to the above procedure, and the support frame 3 is assembled as shown in FIG. 9(a). The support frame 3 thus assembled is firmly fixed between the main girders 50 in a stable state by means of the flange installation members 4 and the abutting metal fittings 9 .

After that, by installing the scaffolding board 2 on the support frame 3, as shown in FIG. is installed.

Among the construction related to the floor slab replacement work of the highway bridge B, after the construction process performed using the work scaffold 1 formed at the height P1 near the lower flange 501 of the main girder 50 is completed, the next construction process A working scaffold 1 having a scaffold board 2 formed at an intermediate height P2 of a main girder 50 is assembled.

As shown in FIG. 9(b), the support pipes 15 are connected to each of the flange installation members 4 of the support frame 3 already installed between the main girders 50. As shown in FIG. As described above, the support pipe 15 is connected and erected by inserting the diameter-reduced portion 151 into the upper end opening that is the connecting portion of the connecting pipe 5, and is installed on the side of the erected support pipe 15. The connected fittings 14 are arranged at an intermediate height P2 of the main girder 50 in the direction of the bridge axis and the direction perpendicular to the bridge axis.

After that, using this connecting tool 14, in the same procedure as before, a new horizontal member 8, an abutting metal fitting 9, and a horizontal pipe 10 are connected to the support pipe 15, and as shown in FIG. As shown, the support structure 3 is assembled. After that, by installing the scaffolding board 2 on the support frame 3, the scaffolding board 2 for workers to come and go is formed at the intermediate height P2 of the main girder 50 as shown in FIG. A working scaffold 1 called a middle scaffold is installed.

As shown in FIG. 6( a ), after the construction process using the inter-girder middle stage scaffolding is completed, the scaffolding plate 2 is placed at the height P3 near the upper flange of the main girder 50 to be used in the next construction process. The working scaffold 1 formed is assembled.

As shown in FIG. 10( a ), the support frame 3 already installed between the main girders 50 is in a state in which the support pipes 15 reach a height P3 near the upper flange of the main girder 50 . On the side surface of the support pipe 15, the coupler 14 is arranged at a height P3 near the upper flange of the main girder 50 in the direction of the bridge axis and the direction perpendicular to the bridge axis.

Therefore, by using this connector 14, just by connecting the new horizontal member 8, the abutting metal fitting 9, and the horizontal pipe 10 to the pillar pipe 15 in the same procedure as before, as shown in FIG. The support structure 3 can be assembled as shown. After that, by installing the scaffolding board 2 on the uppermost stage of the support frame 3, the scaffolding board 2 for workers to come and go was formed at the height P3 near the upper flange of the main girder 50 as shown in FIG. A working scaffolding 1, commonly referred to as an upper scaffolding, is installed.

As described above, according to the work scaffold 1 and the flange installation member 4 used in the work scaffold 1 of the present invention, the installation reference points A and A' of the work scaffold 1 are set in advance on each of the adjacent main girders 50. By installing the flange installation member 4 prior to this position, the distance is measured using the horizontal pipe 10 instead of a ruler without surveying, etc., and the flange installation member 4 installed subsequently. Positioning and installation work can be performed.

Further, the horizontal member 8, the abutting metal fitting 9, and the horizontal pipe 10 can be easily connected to the flange installation member 4 by simply inserting the member to be connected 11 into the connecting member 14 without using a separate metal fitting such as a clamp. As a result, the support frame 3 can be quickly assembled with a small number of workers, and the efficiency of scaffold assembly work can be greatly improved.

In addition, since the number of members is also reduced, it is possible to reduce the weight of the working scaffold itself economically. Therefore, it is possible to shorten the construction period, reduce the construction cost, and improve safety in assembling the work scaffold.

Further, the support frame 3 can be used for both the case of arranging the scaffolding board 2 at the middle height P2 of the main girder 50 and the case of arranging the scaffolding board 2 at the height P3 near the upper flange of the main girder 50 without separate assembly. Therefore, it is possible to greatly improve the working efficiency when assembling the working scaffolds 1 having different heights according to the work contents, corresponding to the progress of the construction related to the bridge.

The working scaffold and the flange installation member of the present invention are not limited to the above-described embodiments, and various modifications are possible without departing from the scope of the present invention.

For example, in the present embodiment, the working scaffold 1 having a length of two horizontal pipes 10 in the direction of the bridge axis is installed, but the length is not limited to this, and the length is one or three. You may assemble it to the above length.

In addition, in the present embodiment, the working scaffold 1 corresponding to three levels of height is installed between the main girders 50. The scaffolding board 2 may be provided only at the neighboring height P1 and the upper flange neighboring height P3. If a working scaffold corresponding to the height P3 near the upper flange is not required, a member having a length shorter than that of the girder of the main girder 50 may be adopted as the support pipe 15 .

In addition, in the present embodiment, the case of applying the flange installation member 4 to the work scaffold 1 installed between the main girders 50 was taken as an example, but it is not necessarily limited to this. It may be applied to a projecting scaffold installed at the end of the bridge B, such as

Specifically, the flange installation member 4 is installed on the lower flange 501 of the main girder 50 , and the horizontal pipe 10 is connected to the adjacent flange installation member 4 . Further, a support pipe 15 is connected to each of the flange installation members 4, and this is used as a support for the projecting scaffolding. In this case as well, the horizontal pipe 10 can be used as a ruler to position the flange installation member 4, so that the assembly work can be greatly reduced.

1 Work scaffold 2 Scaffold board 3 Support frame 4 Flange installation member 5 Connecting pipe 6 Flange gripping member 61 Tie member 62 Clamp 71 Auxiliary member 72 Reinforcing member 8 Horizontal member 81 Beam member 811 Upper chord member 812 Lower chord member 82 End member 821 Upper pipe 822 Lower pipe 823 Connecting member 9 Abutting metal fitting 91 Female screw member 92 Male threaded rod 93 Pressing member 10 Horizontal pipe 11 Connected member 12 Insertion part 13 Removal prevention device 14 Connector 141 Vertical hole 15 Post pipe

50 main girder 501 lower flange 502 upper flange 503 web

B Bridge S Main scaffolding

Claims (5)

A work scaffold installed on a steel main girder constituting a bridge and comprising a scaffold board and a support frame for supporting the scaffold board,
The support structure comprises an axial direction member arranged to extend in the bridge axial direction, and a flange installation member installed on the lower flange of the main girder,
A connected member is installed at the end of the bridge axis direction member,
A plurality of connectors that connect to the connected member are installed on the flange installation member,
A working scaffold, wherein a plurality of said connecting tools are arranged in a bridge axis direction. A working scaffold according to claim 1,
The support structure further comprises a bridge axis orthogonal direction member arranged to extend in the bridge axis orthogonal direction,
The connected member is installed at the end of the bridge axis orthogonal direction member,
A working scaffold, wherein a plurality of said connecting tools are arranged on said flange installation member in each of the bridge axis direction and the bridge axis orthogonal direction. In the working scaffold according to claim 1 or 2,
The support frame further comprises a support pipe erected parallel to the web of the main girder and having a plurality of the connectors installed on the side surface,
The flange installation member has a connecting portion that connects to the lower end of the support pipe,
A working scaffold, wherein the plurality of connectors installed on the support pipes are arranged at the planned installation height positions of the scaffold boards in both the bridge axis direction and the bridge axis orthogonal direction. A flange installation member used for the work scaffold according to any one of claims 1 to 3,
a connecting pipe erected parallel to the web of the main girder and provided with a plurality of the connectors;
a flange gripping member fixed to the connecting pipe and gripping the lower flange of the main girder;
A flange mounting member, wherein said flange gripping member comprises a clamp with a tightening bolt located below said lower flange. 5. The flange mounting member according to claim 4,
The flange gripping member is provided with a plurality of the clamps,
A flange installation member, wherein a plurality of the clamps are arranged on both sides in the bridge axis direction centering on the connecting pipe.

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