JP7456970B2 - Scaffolding unit and framework construction method - Google Patents

Description

The present invention relates to a scaffolding unit and a method for constructing a framework.

Patent Document 1 below describes a scaffolding unit in which a plurality of scaffolding frames 3 are connected and installed in a cylindrical concrete structure 1 as a scaffolding unit used for an existing structure having a wall portion forming a hollow portion inside. A working scaffolding unit 8 has been proposed. In this work scaffold unit 8, the scaffold frame 3 is erected so that four columns 4 are located at the corners of a rectangle, and adjacent columns 4 are connected by providing multiple levels of horizontal members 5 in the vertical direction. , a scaffold board 6 is placed on the horizontal member 5.
Further, Patent Document 2 listed below proposes a scaffold support structure 2 that is disposed inside a hollow structure 10 that includes a ceiling portion 11 in which an opening 12 is formed. This support structure 2 includes an outer support 30 arranged on the upper surface of the ceiling part 11, an inner support 31 arranged inside the hollow structure 10, and an outer support 30 and an inner support 31. A locking means 40 for hanging the scaffold is attached to the inner support 31.

Japanese Patent Application Publication No. 2010-90633 JP 2015-59303 Publication

In the work scaffolding unit 8 described in Patent Document 1, the support 4 is erected on the bottom of the cylindrical concrete structure 1, and the supporting force of the work scaffolding unit 8 is secured from the bottom of the cylindrical concrete structure 1. ing. Therefore, when the distance (depth) from the top surface to the bottom surface of the cylindrical concrete structure 1 is large, the number of scaffolding boards 6 becomes enormous, and it takes time and effort to install and remove the working scaffolding unit 8.
Further, in the scaffold support structure 2 described in Patent Document 2, the ceiling part 11 in which the opening 12 is formed is required, and the outer support body 30 must be separately arranged on the upper surface of the ceiling part 11.
The present invention solves the above-mentioned problems and makes it possible to easily install and remove a scaffolding unit when constructing a frame on the upper surface of a wall in an existing structure that has a wall that forms a hollow inside. The challenge is to

In order to solve the above problems, the present invention is a scaffolding unit used in an existing structure that includes a wall portion that forms a hollow portion inside. This scaffolding unit includes a column, an upper support, a hanging material, a lower support, and a lower scaffold. The support columns are erected on the upper surfaces of the opposing walls. The upper support body is supported by the column. The hanging material is suspended from the upper support. The lower support body is suspended from the hanging material. The lower scaffold is placed on the lower support. Then, in a state in which a frame is constructed on the upper surface of the wall portion so that the base side of the pillar is buried, a connecting portion of the pillar with the upper support body is exposed to the outside.
In the present invention, a work platform can be prepared in advance by connecting an upper support body and a lower support body on which a lower scaffolding body is placed by a hanging material. Furthermore, the scaffolding unit can be easily installed by lifting and moving the work platform using a lifting device such as a crane, and connecting the upper support to the column. Furthermore, although the base side of the support column is buried in the frame of the scaffolding unit, if the support support unit is separated from the upper support, the components other than the support support can be easily lifted and removed using a lifting device, making it easy to use for other existing structures. Can be used for other purposes.
As described above, according to the present invention, when constructing a frame on the upper surface of the wall of an existing structure having a wall forming a hollow inside, it is possible to easily install and remove the scaffolding unit. It becomes possible.

In the scaffolding unit, the upper support preferably has an upper beam connected to the support column and an upper girder placed on the upper beam, and the lower support preferably has a lower beam connected to the suspension member and a lower girder placed on the lower beam.
In this configuration, the upper support body and the lower support body can be easily constructed using common steel materials while ensuring sufficient strength.
The scaffold unit preferably comprises an upper scaffold body placed on the upper support.
In this configuration, the top of the upper support can also be used as a work floor for various operations.

In the scaffolding unit, it is preferable that the lower scaffolding body is configured such that an end portion thereof can be folded so that an external area of the lower scaffolding body in a plan view becomes small.
With this configuration, even if the opening of the frame to be constructed on the top surface of the wall is smaller than the opening of the existing structure, the scaffold unit can be lifted by the lifting device after the frame is constructed without the lower scaffolding body coming into contact with the frame. It can be removed.
In the scaffolding unit, it is preferable that the lower scaffolding body is located below the upper surface of the wall.
With this configuration, work such as assembling a formwork for constructing a frame on the upper surface of the wall becomes easier, for example.

Further, the present invention is a method for constructing a framework for constructing a framework on the upper surface of an existing structure having a wall that forms a hollow inside. In this method of constructing a frame, supports are erected on the upper surfaces of the opposing walls. Further, a work platform is produced in which an upper support body and a lower support body located below the upper support body and on which a lower scaffolding body is placed are connected by a hanging material. Subsequently, the upper support body is connected to the support column, so that the work platform is supported by the support column. Subsequently, the frame is constructed on the upper surface of the wall such that the base side of the support is buried and the connecting portion of the support with the upper support is exposed to the outside.
In the framework construction method, after constructing the framework, it is preferable that the ends of the lower scaffold be folded so that the outer area of the lower scaffold in plan view is reduced. Subsequently, the column and the upper support are separated and the work platform is removed.

According to the present invention, when constructing a frame on the upper surface of a wall of an existing structure that includes a wall that forms a hollow inside, it is possible to easily install and remove a scaffolding unit.

FIG. 1 is a perspective view showing a scaffolding unit according to an embodiment of the present invention. 1 is a flowchart showing the details of a framework construction method according to an embodiment of the present invention. FIG. 3 is a perspective view illustrating how the pillars are erected. FIG. 3 is a perspective view for explaining how a lower pedestal of the work pedestals is manufactured. It is a front view for demonstrating the connection structure of the edge part of a lower beam material. FIG. 5 is a perspective view continuing from FIG. 4 and illustrating how the lower pedestal of the work pedestal is manufactured. FIG. 3 is a perspective view illustrating how the upper pedestal of the work pedestals is manufactured. FIG. 8 is a perspective view continued from FIG. 7 and illustrating how the upper pedestal of the work pedestal is manufactured. FIG. 2 is a perspective view illustrating how a working platform is manufactured by connecting an upper platform and a lower platform with a hanging material. FIG. 3 is a perspective view illustrating how the work platform is supported by the pillars. FIG. 2 is a perspective view for explaining how a frame is constructed. It is a perspective view for demonstrating how the edge part of a lower beam material and a lower girder material is folded together with the edge part of a lower scaffold body. FIG. 3 is a perspective view for explaining how the work platform is removed.

Embodiments of the present invention will be described below with appropriate reference to the drawings. In the drawings shown below, the same reference numerals are given to the same or similar members, and redundant explanations will be omitted as appropriate. Furthermore, the shapes and sizes of members may be schematically represented by being deformed, exaggerated, or omitted for convenience of explanation.
FIG. 1 is a perspective view showing a scaffolding unit 100 according to an embodiment of the present invention. In the following, for convenience of explanation, the directions shown in FIG. 1 may be used as the up, down, front, back, left, and right directions of the scaffolding unit 100.

Scaffolding unit 100 is a scaffolding unit used for existing structure 90. The existing structure 90 is a cylindrical structure and includes a wall portion 91 that forms a hollow portion 92 inside. Specifically, the scaffolding unit 100 is used when constructing a frame 94 on the upper surface 93 of the wall portion 91 in the existing structure 90. Note that the reinforcing bars present on the upper surface 93 of the wall portion 91 are omitted from illustration.
Here, the existing structure 90 is a bridge base supporting the upper structure of a bridge, and the skeleton 94 is a pedestal head formed on the existing structure 90, which is an already constructed bridge base. Then, for example, a pier apex section and a column head are formed on the frame 94, which is the pedestal head.

As shown in FIG. 1, the scaffolding unit 100 includes a support 10 and a work platform 20. The support column 10 is erected on the upper surface 93 of the opposing wall portion 91 . Here, a plurality of columns 10 are arranged on the upper surface 93 of the front wall 91 and the rear wall 91, each extending in the vertical direction. The work platform 20 is a platform constructed as a scaffold for high-altitude work, and is supported by the pillars 10. The work frame 20 includes an upper frame 30, a lower frame 50 located below the upper frame 30, and a hanging member 21 connecting the upper frame 30 and the lower frame 50.

The upper pedestal 30 includes an upper support body 31 and an upper scaffolding body 34. The upper support body 31 is supported by the column 10. The upper support body 31 includes an upper beam member 32 connected to the upper end of the support column 10 and an upper beam member 33 placed on the upper beam member 32. The upper beam members 32 extend along the front-rear direction, and a plurality of upper beam members 32 are arranged parallel to each other. The upper beam members 33 extend in a direction perpendicular to the upper beam member 32, that is, in the left-right direction, and are arranged in plural so as to be parallel to each other. The upper beam member 32 and the upper beam member 33 are joined to each other. The upper scaffold body 34 is placed on the upper support body 31. The upper scaffolding body 34 is composed of, for example, a plurality of elongated plate-like members extending in the front-rear direction. The hanging material 21 is suspended from the upper support 31. Here, the upper end portion of the hanging member 21 is connected to the upper beam member 32 of the upper support body 31.

The lower frame 50 includes a lower support body 51 and a lower scaffold body 54. The lower support body 51 is suspended from the hanging material 21. The lower support body 51 includes a lower beam member 52 connected to the lower end of the hanging member 21 and a lower beam member 53 placed on the lower beam member 52. A plurality of lower beam members 52 extend along the left-right direction and are arranged parallel to each other. The lower beam members 53 extend in a direction perpendicular to the lower beam member 52, that is, along the front-rear direction, and are arranged in plural so as to be parallel to each other. The lower beam member 52 and the lower girder member 53 are joined to each other. The lower scaffold body 54 is placed on the lower support body 51. The lower scaffolding body 54 is located below the upper surface 93 of the wall portion 91. The lower scaffolding body 54 has a central portion 55 located at the center in plan view and end portions 56 located around the central portion 55. The central portion 55 is composed of, for example, a plurality of elongated plate-like members extending in the left-right direction.
Members such as the upper beam material 32, upper girder material 33, lower beam material 52, lower girder material 53, and hanging material 21 that constitute the work platform 20, as well as structural members such as the support column 10, are made of H-beam steel and channel steel. (C-section steel), L-section steel, and other section steels may be used. These structural members can be connected (joined) with each other by various connection means such as screw fastening, clamping, welding, and special connecting tools.

In this embodiment, a frame 94 is constructed on the upper surface 93 of the wall portion 91 so that the base side of the support column 10 is buried. That is, by using the scaffolding unit 100 to assemble a formwork for the frame 94 and pouring concrete inside it, the frame 94 is formed on the existing structure 90, which is a bridge base. When the frame body 94 is constructed, the connection portion of the support column 10 with the upper support body 31 is set to be exposed to the outside.

Next, a method of constructing a frame 94 on the upper surface 93 of the wall 91 of the existing structure 90 using the scaffold unit 100 configured as described above will be described with reference to FIGS. 2 to 13. FIG. 2 is a flowchart showing the details of the framework construction method according to the embodiment of the present invention.
First, as shown in FIG. 3, the support column 10 is erected on the upper surface 93 of the opposing wall portion 91 of the existing structure 90 (step S1 in FIG. 2). That is, the plurality of support columns 10 are erected to face each other with the hollow portion 92 in between. The proximal end (lower end) of the support column 10 is anchored to the upper surface 93 of the wall 91 . Note that the support column 10 is erected on the upper surface 93 of the front wall 91 and the rear wall 91 in FIG. It's okay.

Further, as shown in FIG. 9, a work platform 20 is manufactured on a temporary pier 80 that is used, for example, as a transportation path for materials or a work pier for construction work (step S2 in FIG. 2). That is, the work platform 20 is produced in which the upper support body 31 and the lower support body 51 located below the upper support body 31 and on which the lower scaffold body 54 is placed are connected by the hanging members 21. Note that step S1 and step S2 may be performed simultaneously or in reverse order.

As shown in FIG. 4, in step S2, the lower pedestal 50 of the work pedestal 20 is fabricated on the temporary pier 80. That is, on the temporary pier 80, the lower beam member 53 is placed on the lower beam member 52, and both are joined to form the lower support body 51. The lower end portion of the hanging member 21 is connected to the lower beam member 52 .
The lower support 51 is configured such that the ends 52a and 53a of the lower beam 52 and the lower girder 53 are foldable so that the outer area (circumscribed rectangular area) of the lower support 51 in plan view is small. . That is, as shown in FIG. 5, the lower beam member 52 has a main body portion 52b located at the center in the longitudinal direction, and end portions rotatably connected to both sides of the main body portion 52b in the longitudinal direction about an axis 52c. 52a. The end portion 52a of the lower beam member 52 is arranged in the direction in which the main body portion 52b extends (indicated by a solid line in FIG. 5) and in the direction substantially perpendicular to the extending direction of the main body portion 52b (indicated by a two-dot chain line in FIG. 5). It can be rotated within a certain range. Here, the rotation of the end portion 52a is restricted by the lower flange 52a1 of the end portion 52a abutting the lower flange 52b1 of the main body portion 52b while facing in the extending direction of the main body portion 52b. Further, the end portion 53a of the lower beam member 53 also has a connection structure that is rotatable within a predetermined range similar to the end portion 52a of the lower beam member 52. Note that the connection structure of these end portions 52a and 53a is not limited to the above-mentioned configuration and can be changed as appropriate.

Subsequently, as shown in FIG. 6, the lower scaffold 54 is placed on the lower support 51. The lower scaffolding body 54 is configured such that the end portion 56 is foldable so that the outer area of the lower scaffolding body 54 in a plan view becomes small. The end portion 56 includes, for example, a plurality of steel plates 56a to 56d. The end portion 56 of the lower scaffolding body 54 is configured to be folded together by folding the end portions 52a and 53a of the lower beam member 52 and the lower beam member 53. A handrail 57 is attached to the hanging material 21 so as to surround the outer periphery of the plurality of hanging materials 21.

Further, in step S2, the upper pedestal 30 (see FIG. 1) of the work pedestal 20 is fabricated on the temporary pier 80. That is, as shown in FIG. 7, the upper beam member 33 is placed on the upper beam member 32 on the temporary pier 80, and both are joined to form the upper support body 31.
Subsequently, as shown in FIG. 8, the upper scaffold 34 is placed on the upper support 31. An opening 35 is formed in the upper scaffolding body 34, and a door 36 that can be opened and closed is installed in the opening 35. A worker can pass through the opening 35 and go back and forth between the upper scaffolding body 34 and the lower scaffolding body 54 via a ladder (not shown). A handrail 37 is arranged around the upper scaffolding body 34. At both ends of the upper beam member 32 in the longitudinal direction (back and forth direction), there is a suspension beam 38 to which a wire rope 102 (see FIG. 9) is secured when lifted by a lifting device 101 (see FIG. 9) such as a crane. are attached to each.
Then, as shown in FIG. 9, the lifting device 101 lifts the upper pedestal 30 and moves it above the lower pedestal 50. Next, the upper support 31 of the upper mount 30 is connected to the upper end of the hanging member 21 whose lower end is connected to the lower support 51 of the lower mount 50, thereby completing the production of the work mount 20.

Next, as shown in FIG. 10, the produced work platform 20 is supported by the support column 10 (step S3 in FIG. 2). That is, the lifting device 101 lifts the work platform 20 and moves it above the support column 10 erected on the upper surface 93 of the opposing wall portion 91 of the existing structure 90. Subsequently, the upper beam member 32 of the upper support body 31 is connected to the upper end of the column 10, so that the work platform 20 is supported by the column 10, and the installation of the scaffolding unit 100 is completed. In this embodiment, when the work platform 20 is installed on the support column 10, the upper surface of the lower scaffolding body 54 is located below the upper surface 93 of the wall portion 91.

Next, as shown in FIG. 11, the top surface 93 of the wall 91 of the existing structure 90 is buried so that the base side of the support 10 is buried and the connection part of the support 10 with the upper support 31 is exposed to the outside. A frame 94 is constructed (step S4 in FIG. 2). Specifically, first, a formwork (not shown) is assembled mainly using the lower pedestal 50 of the work pedestal 20 and a peripheral scaffold (not shown) provided around the existing structure 90. Subsequently, the construction of the frame 94 is completed by pouring concrete into the assembled formwork mainly using the upper frame 30 of the work frame 20. At this time, of the scaffolding unit 100, only the base side of the support column 10 is buried in the frame 94.

A hollow portion 95 having a lower opening 95a (see FIGS. 12 and 13) and an upper opening 95b is formed in the frame 94. The opening 95a on the lower side of the frame 94 has the same shape as the opening 92a of the existing structure 90 (see FIGS. 3, 12, and 13). The opening 95b on the upper side of the frame 94 has a smaller opening area than the opening 92a of the existing structure 90. That is, the left-right dimension A2 (see FIGS. 12 and 13) of the upper opening 95b of the frame 94 is smaller than the left-right dimension A1 (see FIGS. 3 and 12) of the opening 92a (see FIG. 12) of the existing structure 90. . Further, the longitudinal dimension B2 (see FIGS. 12 and 13) of the upper opening 95b of the frame 94 is smaller than the longitudinal dimension B1 of the opening 92a of the existing structure 90 (see FIGS. 3 and 12). In addition, after construction of the frame 94, for example, a shoring bracket (not shown) for constructing a pier top slab is installed on the frame 94.

Next, the end portion 56 of the lower scaffolding body 54 is folded so that the outer area of the lower scaffolding body 54 in plan view becomes smaller (step S5 in FIG. 2; see FIG. 13). Specifically, as shown in FIG. 12, the end portion 53a of the lower beam member 53 is folded so that its tip points substantially upward, and then the end portion 52a of the lower beam member 52 is folded so that its tip points upward. It is folded so that it is facing upwards. As a result, the tips of the ends 53a of the lower stringer members 53 located on both left and right sides of the plurality of lower stringer members 53 face inward in the horizontal direction. In this way, the ends 52a and 53a of the lower support body 51 of the lower frame 50 are folded. In addition, in FIG. 12, for convenience of explanation, members other than the lower support body 51 and the hanging material 21 are omitted from illustration. Then, the end portion 56 of the lower scaffolding body 54 is folded together with the end portions 52a, 53a of the lower beam material 52 and the lower girder material 53 as these end portions 52a, 53a are folded (see FIG. 13). .

Next, as shown in FIG. 13, the work platform 20 is removed (step S6 in FIG. 2). Specifically, with the lifting device 101 supporting the work platform 20, the column 10 and the upper support body 31 are first separated. In other words, the bonded state at the connection portion between the support column 10 and the upper support body 31 exposed to the outside of the frame body 94 is released. Subsequently, the lifting device 101 lifts and moves the work stand 20, thereby removing the work stand 20.

As described above, the scaffolding unit 100 according to the present embodiment is used in an existing structure 90 that includes a wall portion 91 that forms a hollow portion 92 inside. This scaffold unit 100 includes a column 10, an upper support 31, a hanging material 21, a lower support 51, and a lower scaffold 54. The support column 10 is erected on the upper surface 93 of the opposing wall portion 91 . The upper support body 31 is supported by the column 10. The hanging material 21 is suspended from the upper support 31. The lower support body 51 is suspended from the hanging material 21. The lower scaffold body 54 is placed on the lower support body 51. Then, in a state where the frame 94 is constructed on the upper surface 93 of the wall portion 91 so that the base side of the column 10 is buried, the connection portion of the column 10 with the upper support body 31 is exposed to the outside.
In this embodiment, the work platform 20 can be prepared in advance by connecting the upper support 31 and the lower support 51 on which the lower scaffold 54 is placed by the hanging members 21. Further, the scaffolding unit 100 can be easily installed by lifting and moving the work platform 20 using a lifting device 101 such as a crane, and connecting the upper support body 31 to the column 10. Further, in the scaffolding unit 100, the base side of the pillar 10 is buried in the frame 94, but if the pillar 10 and the upper support body 31 are separated, the members other than the pillar 10 can be lifted up by the lifting device 101 and easily removed. Therefore, the scaffolding unit 100 can be used for other existing structures 90.
As described above, according to the present embodiment, when constructing the frame 94 on the upper surface 93 of the wall 91 in the existing structure 90 including the wall 91 forming the hollow part 92 inside, the installation of the scaffolding unit 100 is performed. and can be easily removed.

Further, in this embodiment, the upper support body 31 includes an upper beam member 32 connected to the support column 10 and an upper beam member 33 placed on the upper beam member 32. The lower support body 51 includes a lower beam member 52 connected to the hanging member 21 and a lower beam member 53 placed on the lower beam member 52. With this configuration, the upper support body 31 and the lower support body 51 can be easily constructed using general steel materials, and sufficient strength can be ensured.
Further, in this embodiment, the scaffold unit 100 includes an upper scaffold body 34 placed on the upper support body 31. With this configuration, the top of the upper support 31 can also be used as a work floor used during various operations such as concrete pouring.

Moreover, in this embodiment, the lower scaffolding body 54 is configured such that the end portion 56 is foldable so that the outer area of the lower scaffolding body 54 in plan view becomes small. With this configuration, even if the opening 95b of the frame 94 is smaller than the opening 92a of the existing structure 90, the scaffold unit 100 can be lifted and removed without the lower scaffold body 54 coming into contact with the frame 94 after the frame 94 is constructed. .
Further, in this embodiment, the lower scaffolding body 54 is located below the upper surface 93 of the wall portion 91. With this configuration, for example, work such as assembling a formwork for constructing the frame 94 on the upper surface 93 of the wall portion 91 becomes easier.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit thereof.
The configurations of the upper support body 31 and the lower support body 51 are not limited to those shown in FIGS. 4 and 7, and the type and number of shaped steels used may be changed as appropriate.
The hanging material 21 may be connected to the upper beam member 33 of the upper support body 31.
The foldable end portion 56 of the lower scaffolding body 54 is not limited to being folded along the folding line shown in FIG. 6, and the position of the folding line may be changed as appropriate. Note that a configuration may be adopted in which the lower scaffold body 54 does not have the foldable end portion 56.
Furthermore, the scaffolding unit 100 can be used for existing structures other than bridge bodies as long as the existing structure 90 includes a wall portion 91 that forms a hollow portion 92 inside.

10 Column 20 Work frame 21 Hanging material 30 Upper frame 31 Upper support 32 Upper beam 33 Upper girder 34 Upper scaffold 50 Lower frame 51 Lower support 52 Lower beam 53 Lower girder 54 Lower scaffold 56 End 90 Existing structure 91 Wall portion 92 Hollow portion 93 Top surface 94 Frame 100 Scaffolding unit

Claims (7)

A scaffolding unit for use in an existing structure comprising a wall forming a hollow inside, the scaffolding unit comprising:
a pillar erected on the upper surface of the opposing wall;
an upper support supported by the pillar;
a hanging material hanging from the upper support;
a lower support suspended from the hanging material;
a lower scaffold placed on the lower support;
A scaffolding unit characterized in that in a state in which a frame is constructed on the upper surface of the wall so that the base side of the support is buried, a connecting portion of the support with the upper support body is exposed to the outside. The upper support body has an upper beam member connected to the support column, and an upper beam member placed on the upper beam member,
The scaffolding unit according to claim 1, wherein the lower support body includes a lower beam member connected to the hanging member, and a lower girder member placed on the lower beam member. The scaffolding unit according to claim 1 or 2, further comprising an upper scaffolding body placed on the upper support body. According to any one of claims 1 to 3, the lower scaffold body is configured such that an end portion thereof is foldable so that the outer area of the lower scaffold body in a plan view is small. Scaffolding unit as described. The scaffolding unit according to any one of claims 1 to 4, wherein the lower scaffolding body is located below the upper surface of the wall. A method for constructing a framework for constructing a framework on the top surface of an existing structure having a wall that forms a hollow inside, the method comprising:
A support is erected on the upper surface of the opposing wall,
Producing a work platform in which an upper support body and a lower support body located below the upper support body and on which a lower scaffolding body is connected by a hanging material,
The work platform is supported by the support by connecting the upper support to the support,
A method for constructing a frame, comprising constructing the frame on the upper surface of the wall so that the base side of the column is buried and a connecting portion of the column with the upper support body is exposed to the outside. After constructing the framework, fold the ends of the lower scaffold so that the outer area of the lower scaffold in plan view becomes smaller;
7. The frame construction method according to claim 6, further comprising separating the support column and the upper support body and removing the work platform.

Images