How to install metal lath

Abstract

To enable rationally and efficiently install a metal lath to a concrete placing joint part in reinforced concrete structures.SOLUTION: A concrete placing joint part Cj is set between adjacent reinforcement units U of a reinforced-concrete structure; in a pre-assembly yard, a metal lath unit 10 is preassembled by mounting, to a steel frame 12 for supporting the metal lath 11, a metal lath 11 having formed therein a large number of through-holes 11a through which connecting horizontal reinforcements 2 to be connected to horizontal reinforcements 41 of a reinforcement unit U are passed; after one of the adjacent reinforcement units U is installed at a reinforcement unit installation position, the metal lath unit 10 is lifted and arranged at a concrete placing joint part Cj; after the metal lath unit 10 is arranged, the connecting horizontal reinforcement 2 is passed through the through hole 11a of the metal lath 11 and fixed to the steel frame 12; and the fixed connecting horizontal reinforcement 2 is connected to the horizontal reinforcement 41 of one of the reinforcement units U.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a method for installing a metal lath at a concrete joint portion of a reinforced concrete structure.

Background Art

[0002] As a background art of the present invention, for example, an air fence is installed in each first region between first reinforcing bars at a concrete joint portion to close the first region, and a lath unit is installed in each second region between adjacent air fences sandwiching the first reinforcing bar to close the second region, and then concrete is placed. After the concrete has hardened, the lath unit remains in the second region, the air in each air fence is removed, each air fence is removed upward from the first region, and concrete is placed in the first region from which each air fence has been removed to perform concrete jointing (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the concrete jointing method described in Patent Document 1, after arranging a first reinforcing bar group and a second reinforcing bar group in a construction region of a reinforced concrete structure, it is necessary to individually install an air fence in each first region of the concrete joint portion and a lath unit in each first region of the concrete joint portion. Therefore, it takes a considerable amount of time and labor to install the air fence and the lath unit.

[0005] In particular, when reinforced concrete structures are used in buildings where high load-bearing capacity to withstand excessive impacts is desired, for example, in reinforced concrete walls with a wall thickness of about 2 to 3 meters, the reinforcing bars used to fix the air fence and lath units are mostly concentrated on the wall side. As a result, air fences and lath units installed on the wall side of the concrete joint can be fixed to the reinforcing bars, but air fences and lath units installed on the interior side of the concrete joint cannot be fixed to the reinforcing bars. In such cases, when installing air fences and lath units at a concrete joint, it becomes necessary to fabricate a framework to fix the interior air fence and lath units to the reinforcing bars, and then install the air fences and lath units, which significantly increases the time and effort required for installation.

[0006] In light of these circumstances, the main objective of the present invention is to enable the rational and efficient installation of metal lath at concrete joints in reinforced concrete structures. [Means for solving the problem]

[0007] The first characteristic configuration of the present invention is a method for installing metal lath in the concrete joint of a reinforced concrete structure, The space between adjacent reinforcing units of the reinforced concrete structure is set as the concrete joint, In the pre-assembly yard, the metal lath, which has numerous through-holes formed in it through which connecting reinforcing bars are connected to the reinforcing bars of the reinforcing bar unit, is attached to the steel frame that supports the metal lath to pre-assemble the metal lath unit. After installing one of the adjacent reinforcing bar units in the reinforcing bar unit installation position, the metal lath unit is lifted and placed in the concrete joint, and after the metal lath unit is placed, the connecting horizontal bars are passed through the through holes in the metal lath. The connecting horizontal reinforcement is fastened with a fixing device. The key point is that the connecting cross bar is fixed to the steel frame and then connected to the cross bar of one of the reinforcing bar units.

[0008] According to this configuration, by pre-assembling the metal lath units in the pre-assembly yard, it is possible to quickly place the metal lath units at the concrete joint after one of the reinforcing bar units has been installed at the reinforcing bar unit installation location. After the metal lath unit is positioned, each connecting horizontal bar is passed through the through-holes in the metal lath and fixed to the steel frame. This allows each connecting horizontal bar to be easily positioned in the correct location relative to the horizontal bar of one of the reinforcement units, and each connecting horizontal bar can be easily connected to the horizontal bar of the other reinforcement unit. This connection allows the metal lath unit, including the metal lath, to be properly installed at the concrete joint. As a result, the installation of metal lath units, including metal lath, at concrete joints in reinforced concrete structures can be carried out rationally, efficiently, and appropriately, thereby shortening the construction period.

[0009] A second characteristic feature of the present invention is that, after installing one of the adjacent reinforcing bar units at the reinforcing bar unit installation position, the connecting cross bar is connected to the cross bar of the other reinforcing bar unit.

[0010] According to this configuration, by installing the metal lath unit at the concrete joint of a reinforced concrete structure, and then installing the other reinforcement unit at the reinforcement unit installation position, it is possible to make the installation of the metal lath unit at the concrete joint easier compared to, for example, installing the other reinforcement unit at the reinforcement unit installation position and then installing the metal lath unit at the concrete joint. As a result, the installation of metal lath units, including metal lath, at concrete joints in reinforced concrete structures can be carried out more rationally and efficiently, and the construction period can be shortened more effectively.

[0011] A third characteristic feature of the present invention is that a mechanical joint is provided at the end of the horizontal reinforcement on the concrete joint side, and the horizontal reinforcement and the connecting horizontal reinforcement are connected by the mechanical joint.

[0012] According to this configuration, when installing metal lath at the concrete joint of a reinforced concrete structure, the horizontal reinforcement of the reinforcing bar unit and the connecting horizontal reinforcement of the metal lath unit can be easily and securely connected using a mechanical joint. As a result, the installation of metal lath units, including metal lath, at concrete joints in reinforced concrete structures can be carried out more rationally and efficiently, and the construction period can be shortened more effectively. [Brief explanation of the drawing]

[0013] [Figure 1] Front view of the main part showing the state after one of the rebar support frames has been installed at the rebar unit installation position during the first rebar unit installation process. [Figure 2] Front view of the main part showing the state in which the vertical reinforcement unit is assembled to the wall side of one of the reinforcement support frames during the first reinforcement unit installation process. [Figure 3] Front view of the main part showing the state in which the vertical and horizontal reinforcement units are assembled on the wall side of one of the reinforcement support frames during the first reinforcement unit installation process. [Figure 4] Side view of the main part showing the state in which the vertical and horizontal reinforcement units are assembled on the wall side of one of the reinforcement support frames during the first reinforcement unit installation process. [Figure 5] Front view of the main section showing the metal lath unit placed at the concrete joint and the connecting horizontal reinforcement attached during the metal lath unit placement process. [Figure 6] Side view of the main part showing the metal lath unit being placed at the concrete joint and the connecting horizontal reinforcement being attached during the metal lath unit placement process. [Figure 7] Front view of the main part showing the state in which the horizontal reinforcement of one of the rebar support frames and the connecting horizontal reinforcement of the metal lath unit are connected during the metal lath unit placement process. [Figure 8]Front view of the main part showing the state where the other reinforcing bar support base is installed at the installation position of the second reinforcing bar unit during the second reinforcing bar unit installation process [Figure 9] Front view of the main part showing the state where the vertical bar unit is assembled on the wall surface side of the other reinforcing bar support base during the second reinforcing bar unit installation process [Figure 10] Front view of the main part showing the state where the vertical bar unit and the horizontal bar unit are assembled on the wall surface side of the other reinforcing bar support base and the horizontal bar of the other reinforcing bar support base is connected to the connecting horizontal bar of the metal lath unit during the second reinforcing bar unit installation process [Figure 11] Front view of the metal lath unit showing the configuration of the metal lath unit

Embodiment for Carrying out the Invention

[0014] Hereinafter, as an example of an embodiment for carrying out the present invention, the method for installing a metal lath according to the present invention will be described based on the drawings in an embodiment applied to a concrete joint portion of a reinforced concrete wall that needs to be about 2 to 3 m thick in a building that is desired to have high strength capable of withstanding excessive impact, which is an example of a concrete joint portion of a reinforced concrete structure In addition, the method for installing a metal lath according to the present invention is not limited to the concrete joint portion of a reinforced concrete wall that needs to be about 2 to 3 m thick, and can be applied to, for example, the concrete joint portion of a reinforced concrete wall with a wall thickness of less than 2 m, or the concrete joint portion between a reinforced concrete wall and a reinforced concrete column

[0015] As shown in Fig. 10, the reinforced concrete wall exemplified in this embodiment is constructed by installing a plurality of reinforcing bar units U for the reinforced concrete wall in a row in the wall length direction (in-plane direction) of the reinforced concrete wall at the installation position of the reinforcing bar units provided at the wall construction position at the construction site. After installing the metal lath unit 10 at the concrete joint portion Cj set between adjacent reinforcing bar units U, a formwork (not shown) for forming the placement area of the wall concrete (not shown) is assembled, and the wall concrete is placed and jointed in a predetermined order in each placement area divided into a plurality by the formwork and the metal lath unit 10, so that it is constructed at the wall construction position at the construction site with a high bearing capacity having a wall thickness of about 2 to 3 m.

[0016] Regarding the configuration of the reinforcing bar unit U, as shown in Figs. 1 to 10, each reinforcing bar unit U is constructed by installing a pre-assembled reinforcing bar support base 20 pre-assembled in the pre-assembly yard secured around the construction site at the installation position of the reinforcing bar units at the construction site, and then assembling the longitudinal bar unit 30 and the transverse bar unit 40 pre-assembled in the pre-assembly yard on each wall surface side of the reinforcing bar support base 20.

[0017] The reinforcing bar support base 20 is constructed by welding or bolting a plurality of column members 21 made of L-shaped steel or channel steel and a plurality of erection members 22 made of L-shaped steel erected on adjacent column members 21. The lower end of each column member 21 is fixed by a post-construction anchor (not shown) and thus installed at the installation position of the reinforcing bar units at the construction site. The longitudinal bar unit 30 is formed in a strip shape by arranging a predetermined number of longitudinal bars 31 on a plurality of longitudinal bar positioning members 32 arranged in parallel at a predetermined interval with a predetermined longitudinal bar pitch and then fixing them to each longitudinal bar positioning member 32 with U-bolts 33 or the like. The transverse bar unit 40 is formed in a strip shape by arranging a predetermined number of transverse bars 41 on a plurality of transverse bar positioning members 42 arranged in parallel at a predetermined interval with a predetermined transverse bar pitch and then fixing them to each transverse bar positioning member 42 with U-bolts 43 or the like. L-shaped steel is adopted for the longitudinal bar positioning members 32 and the transverse bar positioning members 42.

[0018] The vertical reinforcement bars 31 and horizontal reinforcement bars 41 are threaded reinforcing bars that can be connected by mechanical connectors 1. When each vertical reinforcement bar 31 is assembled to the wall side of the reinforcement support frame 20, its lower end is connected via mechanical connectors 1 to each vertical reinforcement bar 31 that extends upward from the slab 3 at the construction site. For this reason, mechanical connectors 1 are provided at the upper end of each vertical reinforcement bar 31 on the slab 3 side. Each horizontal reinforcement bar 41 is equipped with a mechanical connector 1 at the end on the concrete joint Cj side.

[0019] The upper end of the rebar support frame 20 is provided with a plurality of vertical rebar unit positioning members 23 to 25 (three in this embodiment) that position vertical rebar units 30, which are arranged in multiple rows (three in this embodiment) at predetermined intervals on each wall side of the rebar support frame 20, in predetermined positions. Vertical rebar unit positioning member 23 positions the first row of vertical rebar units 30 from the rebar support frame 20, vertical rebar unit positioning member 24 positions the second row of vertical rebar units 30 from the rebar support frame 20, and vertical rebar unit positioning member 25 positions the third row of vertical rebar units 30 from the rebar support frame 20 (see Figure 4). L-shaped steel is used for each vertical rebar unit positioning member 23 to 25, and the vertical rebars 31 of the vertical rebar units 30 are fixed with U-bolts 26 or the like (see Figure 2).

[0020] To describe the configuration of the metal lath unit 10, as shown in Figures 5 to 11, the metal lath unit 10 is pre-assembled in the pre-assembly yard by attaching a metal lath 11, which has numerous through holes 11a through which connecting horizontal bars 2 that connect to the horizontal bars 41 of the reinforcing bar unit U are passed, to a steel frame 12 that supports the metal lath 11. Specifically, in the pre-assembly yard, the metal lath 11 is attached to the steel frame 12 to form a first segmented lath unit 10A of standard height and a second segmented lath unit 10B for height adjustment. By bolting a predetermined number of these segmented lath units 10A and 10B together in the vertical direction, a metal lath unit 10 with an appropriate height according to the wall height can be rationally pre-assembled.

[0021] Each steel frame 12 is formed in a rectangular shape by welding together multiple vertical members 14 to which multiple connecting horizontal bars 2 are attached at a predetermined horizontal bar pitch using U-bolts 13, and upper and lower horizontal members 15 that span the multiple vertical members 14. The metal lath unit 10 is temporarily assembled to a predetermined number of vertical bars 31 arranged in the concrete joint Cj using binding wire, and is then placed in the concrete joint Cj. After being placed in the concrete joint Cj, multiple connecting horizontal bars 2 are attached to each vertical member 14 of each steel frame 12 using U-bolts 13, etc. L-shaped steel is used for the vertical members 14 and horizontal members 15.

[0022] The metal lath installation method illustrated in this embodiment is a method for installing metal lath 11 in a concrete joint Cj set between adjacent reinforcing bar units U of a reinforced concrete wall, as shown in Figures 1 to 10. This metal lath installation method includes a first reinforcing bar unit installation step (see Figures 1 to 4) in which one of the adjacent reinforcing bar units U is installed at the reinforcing bar unit installation position at the construction site, a metal lath unit placement step (see Figures 5 to 7) in which the metal lath unit 10 is placed in the concrete joint Cj of the installed reinforcing bar unit U, and a second reinforcing bar unit installation step (see Figures 8 to 10) in which the other of the adjacent reinforcing bar units U is installed at the reinforcing bar unit installation position at the construction site after the placement of the metal lath unit 10.

[0023] The first rebar unit installation process includes, as shown in Figures 1 to 4, rebar support frame installation work (see Figure 1) in which one of the rebar support frames 20 pre-assembled in the pre-assembly yard is lifted by a lifting machine such as a tower crane and installed at the rebar unit installation position at the construction site; rebar unit placement work (see Figures 2 to 4) in which multiple rows (three rows in this embodiment) of vertical rebar units 30 and horizontal rebar units 40 pre-assembled in the pre-assembly yard are alternately placed on each wall side of the rebar support frame 20 installed at the rebar unit installation position using a lifting machine or aerial work platform; and vertical rebar connection work (see Figures 2 to 4) in which each vertical rebar 31 of the vertical rebar units 30 placed on each wall side of the rebar support frame 20 is connected to each vertical rebar 31 extending upward from the slab 3 at the construction site via a mechanical joint 1.

[0024] By performing these tasks, in the first rebar unit installation process, one of the adjacent rebar units U can be rationally constructed and installed at the rebar unit installation location at the construction site. Furthermore, in the rebar unit placement work, the number of vertical rebar units 30 and horizontal rebar units 40 arranged on each wall side of the rebar support frame 20 can be changed in various ways depending on the wall thickness of the reinforced concrete wall to be constructed at the wall construction location of the construction site.

[0025] The metal lath unit placement process involves, as shown in Figures 5-7, using lifting equipment and aerial work platforms to place a predetermined number of vertical reinforcements 31 on each vertical reinforcement 31 extending upward from the slab 3 of the concrete joint Cj, and connecting the lower end of each placed vertical reinforcement 31 to each vertical reinforcement 31 on the slab 3 side via mechanical joints 1 (see Figure 5), and then lifting the pre-assembled metal lath unit 10 in the pre-assembly yard using lifting equipment and placing it in the concrete joint Cj along each vertical reinforcement 31 of the concrete joint Cj, and the placed metal This includes metal lath unit placement work (see Figure 5), in which the lath unit 10 is temporarily fixed to each vertical reinforcement 31 of the concrete joint Cj with binding wire or the like; connecting horizontal reinforcement work (see Figures 5-7), in which each connecting horizontal reinforcement 2 is passed through each through hole 11a of the metal lath 11 and fixed to each vertical member 14 of the steel frame 12 with U-bolts 13 using an aerial work platform or the like; and connecting horizontal reinforcement work (see Figure 7), in which each fixed connecting horizontal reinforcement 2 is connected to each horizontal reinforcement 41 of one of the reinforcement units U via a mechanical joint 1 provided on the horizontal reinforcement 41.

[0026] By performing these operations, in the metal lath unit placement process, the metal lath unit 10 can be placed at the concrete joint Cj while connected to one of the reinforcing bar units U installed at the reinforcing bar unit installation position at the construction site.

[0027] The second rebar unit installation process involves, as shown in Figures 8-10, the rebar support frame installation work (see Figure 8), in which the other rebar support frame 20, which was pre-assembled in the pre-assembly yard, is lifted using a hoisting machine and installed at the rebar unit installation position at the construction site, and then, on each wall side of the rebar support frame 20 installed at the rebar unit installation position, the vertical rebar units 30 and horizontal rebar units 40, which were pre-assembled in the pre-assembly yard, are arranged alternately in multiple rows (three rows in this embodiment) using a hoisting machine or aerial work platform. This includes the placement of reinforcing bar units (see Figures 9-10), the connection of vertical bars (see Figure 9) in which each vertical bar 31 of the vertical reinforcing bar units 30 placed on each wall side of the reinforcing bar support frame 20 is connected to each vertical bar 31 extending upward from the slab 3 at the construction site via mechanical joints 1, and the connection of horizontal bars (see Figure 10) in which each horizontal bar 41 of the other reinforcing bar unit U is connected to each connecting horizontal bar 2 of the metal lath unit 10 via mechanical joints 1 provided on the horizontal bar 41.

[0028] By performing these operations, in the second reinforcing bar unit installation process, the other of the adjacent reinforcing bar units U can be rationally constructed and installed at the reinforcing bar unit installation position at the construction site, connected to the metal lath unit 10 positioned at the concrete joint Cj.

[0029] In other words, in the metal lath installation method illustrated in this embodiment, one of the adjacent reinforcing bar units U is installed at the reinforcing bar unit installation position, then the pre-assembled metal lath unit 10 is lifted in the pre-assembly yard and placed at the concrete joint Cj, and after the metal lath unit 10 is placed, the connecting cross bars 2 are passed through each through hole 11a of the metal lath 11 and fixed to the steel frame 12 of the metal lath unit 10, and each fixed connecting cross bar 2 is connected to each cross bar 41 of one reinforcing bar unit U via the mechanical joint 1 provided on the cross bar 41. Then, after the other of the adjacent reinforcing bar units U is installed at the reinforcing bar unit installation position, each connecting cross bar 2 is connected to each cross bar 41 of the other reinforcing bar unit U via the mechanical joint 1 provided on the cross bar 41.

[0030] As described above, in the metal lath installation method illustrated in this embodiment, by pre-assembling the metal lath unit 10 in the pre-assembly yard, the placement of the metal lath unit 10 at the concrete joint Cj after one of the reinforcing bar units U has been installed at the reinforcing bar unit installation position can be carried out quickly.

[0031] Then, after the metal lath unit 10 is positioned, each connecting horizontal bar 2 is passed through each through hole 11a of the metal lath 11 and fixed to the steel frame 12. This allows each connecting horizontal bar 2 to be easily positioned in the correct location relative to the horizontal bar 41 of one of the reinforcing bar units U, and each connecting horizontal bar 2 can be easily connected to the horizontal bar 41 of one of the reinforcing bar units U. This connection allows the metal lath unit 10, including the metal lath 11, to be properly installed in the concrete joint Cj.

[0032] Furthermore, by installing the metal lath unit 10 at the concrete joint Cj of the reinforced concrete wall, and then installing the other reinforcing bar unit U at the reinforcing bar unit installation position, the installation of the metal lath unit 10 at the concrete joint Cj can be made easier compared to, for example, installing the other reinforcing bar unit U at the reinforcing bar unit installation position before installing the metal lath unit 10 at the concrete joint Cj.

[0033] Furthermore, when installing the metal lath 11 at the concrete joint Cj of the reinforced concrete wall, the connection between each horizontal bar 41 of the reinforced concrete unit U and each connecting horizontal bar 2 of the metal lath unit 10 can be easily and firmly made using the mechanical joint 1.

[0034] As a result, the installation of the metal lath unit 10, including the metal lath 11, to the concrete joint Cj of the reinforced concrete wall can be carried out rationally, efficiently, and appropriately, thereby shortening the construction period.

[0035] [Another embodiment] Another embodiment of the present invention will be described. Furthermore, the configurations of each of the separate embodiments described below are not limited to being applied individually, but can also be applied in combination with the above-described embodiments or other separate embodiments.

[0036] (1) In the above embodiment, the method of installing the metal lath was illustrated by connecting the horizontal bars 41 of the reinforcing bar unit U and the connecting horizontal bars 2 of the metal lath unit 10 with a mechanical joint 1. However, the method is not limited to this, and for example, the horizontal bars 41 of the reinforcing bar unit U and the connecting horizontal bars 2 of the metal lath unit 10 may be connected by overlapping joints or the like.

[0037] (2) In the above embodiment, the metal lath unit 10 was exemplified as having a configuration in which a predetermined number of first divided lath units 10A and second divided lath units 10B are connected in the vertical direction. However, it is not limited to this, and for example, it may be configured as an integrated type that cannot be divided in the vertical direction. [Explanation of Symbols]

[0038] 1. Mechanical coupling 2. Horizontal reinforcement bars for connecting 10 Metal Lath Unit 11 Metal Lath 11a Through hole 12 Steel frame 41 Horizontal lines Cj Concrete joint U-shaped rebar unit

Claims

1. A method for installing metal lath in the concrete joint of a reinforced concrete structure, The space between adjacent reinforcing units of the reinforced concrete structure is set as the concrete joint, In the pre-assembly yard, the metal lath, which has numerous through-holes formed in it through which connecting reinforcing bars are connected to the reinforcing bars of the reinforcing bar unit, is attached to the steel frame that supports the metal lath to pre-assemble the metal lath unit. A method for installing metal lath, comprising: installing one of the adjacent reinforcing bar units at the reinforcing bar unit installation position; lifting the metal lath unit and placing it in the concrete joint; after the placement of the metal lath unit, passing the connecting horizontal bars through the through holes of the metal lath and fixing the connecting horizontal bars to the steel frame with fasteners; and connecting the fixed connecting horizontal bars to the horizontal bars of one of the reinforcing bar units.

2. The method for installing a metal lath according to claim 1, wherein after installing the other of the adjacent reinforcing bar units at the reinforcing bar unit installation position, the connecting horizontal bar is connected to the horizontal bar of the other reinforcing bar unit.

3. A method for installing metal lath according to claim 1 or 2, wherein a mechanical joint is provided at the end of the horizontal reinforcement on the concrete joint side, and the horizontal reinforcement and the connecting horizontal reinforcement are connected by the mechanical joint.

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