JP2997449B1 - Rebar assembling work scaffold and construction method of rebar structure using this work scaffold - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To enable a single scaffold to move back and forth between three or more sections partitioned by an outer wall or an inner wall reinforcing bar group,
Reduces the work of constructing scaffolds in rebar assembly work. SOLUTION: The work scaffold 11 of the present invention has an upper end connected to each other and a height H of a vertical wall portion 13 of a reinforced structure 5.
Slanted ladder legs 14 having a length greater than
And the plurality of ladder legs 14 are radially arranged at three or more forks in plan view.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a reinforcement structure such as a caisson wall reinforcement used as a foundation, and a rebar assembling work scaffold which can be used in this method.

[0002]

2. Description of the Related Art FIGS. 10 and 11 show an example of a reinforced concrete caisson (foundation structure) used for a foundation.
There are the following. The caisson 1 is made of box-shaped (square frame-shaped) reinforced concrete without a square bottom, has a lattice shape in a plan view, and has a plurality of vertical reinforcing bars 2 erected at predetermined intervals. Group 3 is provided.

The vertical reinforcing bar group 3 is arranged along a section line of a rectangular lattice frame shape closed in a plan view, and the horizontal reinforcing bar group 4 is bound to the vertical reinforcing bar group 3 arranged in a frame shape by wire. A reinforcing bar structure 5 having a vertical wall portion 13 composed of vertical and horizontal reinforcing bars 2 and 4 is constructed. The caisson 1 arranges a formwork inside and outside the vertical wall portion 13 of the reinforcing bar structure 5,
It is constructed by placing concrete 6 between the formwork.

As shown in FIG. 11, when constructing the reinforcing bar structure 5, since the worker M enters and exits each of the sections 9A and 9B inside the caisson 1, a plan view of the outer peripheral portion of the caisson 1 is formed. The scaffolding device 6 is provided on the outside 9C (outside of the caisson 1) of the outer wall reinforcing bar group 5A formed in a square frame shape. A scaffold floor 7 is provided in a cantilever manner on the upper part of the scaffolding device 6, and a ladder 8 housed in the outer wall reinforcing bar group 5A leans against the scaffold floor 7.

[0005] As described above, since the ladder 8 leaning against the scaffolding device 6 can enter the section 9A immediately inside the outer wall reinforcing bar group 5A, the work can be performed without directly hanging the ladder 8 on the outer wall reinforcing bar group 5A. The person M can get in and out of the outer wall reinforcing bar group 5A. On the other hand, when the worker M enters and exits the section 9B surrounded only by the inner wall reinforcing bar group 5B, the ladder 8 is directly hung on the uppermost horizontal bar 4 of the already built inner wall reinforcing bar group 5B, and I try to get over 5B.

[0006]

Among the above-mentioned prior arts, in the method in which the ladder 8 is lifted up and down by bridging the ladder 8 on the inner wall reinforcing bar group 5B in order to get over the inner wall reinforcing bar group 5B, the ladder 8 or the worker M As a result, there is a problem in that the reinforcing bar pitch is shifted due to the load and the wall reinforcing bar as designed cannot be obtained, and the binding wire that binds the vertical reinforcing bar 2 and the horizontal reinforcing bar 4 is cut off.

Therefore, a forked stepladder connecting the upper ends of the ladder 8 to each other is erected so as to straddle the inner wall reinforcing bar group 5B. It is conceivable to make it possible to move back and forth between the sections 9B and 9A inside the caisson 1 without applying the load of M to the rebar side. However, the above-described means for straddling the inner wall reinforcing bar group 5B with the forked stepladder only allows the one stepladder to move between the adjacent sections 9A, 9B partitioned by the inner wall reinforcing bar group 5B.

For this reason, all the sections 9A, 9A shown in FIG.
In order for 9B to be able to move back and forth with a bifurcated stepladder, a large number of bifurcated stepladders must be erected in the caisson 1 so as to straddle all the inner wall reinforcing bar groups 5B constituting the caisson 1. Has the disadvantage that the time and labor required for construction are increased. On the other hand, of the above-mentioned conventional techniques, a ladder 8
It is necessary to connect the scaffold floor 7 to the existing scaffolding device 6 in a cantilever manner and then connect the ladder 8 to the scaffold floor 7. The construction work for it is increasing.

The present invention has been made in view of the above-described circumstances, so that one scaffold can move back and forth between three or more sections partitioned by an outer wall or an inner wall reinforcing bar group, thereby reducing the time and labor required for constructing a scaffold in a rebar assembling operation. The primary purpose is to reduce it. A second object of the present invention is to reduce the time and labor required for constructing a scaffold in a rebar assembling work by enabling installation of a scaffold floor and installation of a ladder to an existing scaffold device at a time.

[0010]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is,
The first working scaffold of the present invention includes a plurality of inclined ladder legs having upper ends connected to each other and having a length greater than the height of the vertical wall portion of the reinforced structure, and the plurality of ladder legs. Are radially arranged in three or more branches in plan view.

In the first working scaffold, a plurality of ladder legs may be directly connected at their upper ends. However, in order to improve safety at the upper part of the working scaffold, an embodiment to be described later (FIG. As shown in FIGS. 1 and 2), it is preferable to provide a top plate on which an operator can ride, and connect the upper ends of the plurality of ladder legs to the peripheral edge of the top plate.

Further, the second work scaffold of the present invention has a top plate on which an operator can ride, and an upper end connected to a peripheral portion of the top plate and having a height greater than the height of the vertical wall portion of the reinforced structure. A ladder leg having a length, and an engaging portion fixed to the top plate and detachably engaged with an existing scaffolding device. In the above-described first and second working scaffolds, the ladder leg includes a pair of right and left columns, a plurality of step bars connecting the columns to each other, and a handrail member connected to each of the columns. Things can be adopted.

In this ladder leg, if the handrail member is formed in a shape inclined in a direction in which the handrail member spreads in the width direction of the ladder leg as it separates from the support, as will be described in an embodiment described later. In addition, a plurality of ladder legs can be stacked in several stages (see FIG. 3), which facilitates the transportation and storage of the ladder legs. In addition, if an adjusting means for adjusting the length of the ladder leg is provided at a lower portion of the ladder leg, a change in height of the vertical wall portion of the reinforced structure and a change in height of the existing scaffolding device are provided. Can also respond appropriately.

In order to actually use the first work scaffold on site, the work scaffold must be arranged such that each of the plurality of ladder legs is arranged in each section around the grid point of the section line. You only have to stand. In this case, since each ladder leg attached to the work scaffold is three or more radially arranged in each section around the grid point, only one work scaffold is installed, so Can move back and forth between three or more sections partitioned by the outer wall or inner wall reinforcing bar group.

Further, in order to actually use the second work scaffold on site, the engaging portion of the work scaffold is engaged with an existing scaffolding device which is erected outside the outer periphery of the division line, The scaffold may be erected such that the ladder legs of the scaffold are arranged in a section inside the outer periphery of the section line. In this case, since the engaging portion that detachably engages with the existing scaffolding device is fixed to the top plate having the ladder legs, the second working scaffold suspended by a crane or the like is moved from above the existing scaffold. The second work scaffold can be attached to the existing scaffold simply by carrying in and engaging the engaging portion with the existing scaffolding device, and the installation of the scaffold floor and the installation of the ladder for the existing scaffolding device are performed at once. be able to. Also this second working scaffold
Ladder legs, and each ladder leg
If it is arranged in each section of the second, the second
With only one work platform, you can move between multiple compartments
(See FIG. 9).

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a rebar assembling work scaffold 11 according to a first embodiment of the present invention. The first work scaffold 11 has a rectangular top plate 12 on which an operator M can ride. And four inclined ladder legs 14 having an upper end connected to the peripheral edge of the top plate 12 and having a length greater than the height H of the vertical wall portion 13 of the reinforcing bar structure 5.

The top plate 12 is made of a metal material such as aluminum or steel, and is formed by closing the inside of a substantially square frame with a mesh plate. On the other hand,
The ladder leg 14 is also made of a metal material such as aluminum or steel, and includes a pair of left and right columns 15 parallel to each other and a plurality of step bars 16 connecting the columns 15 to each other. And a handrail member 17 connected to each of the columns 15.

The four ladder legs 14 are arranged such that the right and left columns 15 intersect each of the four sides of the top plate 12 at an obtuse angle of 90 degrees or more (70 degrees in the illustrated example). As shown in FIG. 2, each of the four ladder legs 14 is spaced from the adjacent ladder legs 14 by 90 degrees in the circumferential direction, and It is arranged in a four-pronged radial pattern with the top plate 12 as the center.

At the corner of the top plate 12, a mounting bracket 18 bent substantially in an L-shape is fixed by welding or the like. Is detachably attached by a bolt or the like. The handrail member 1
The handrail body 7 is fixed to each of the columns 15 on both the left and right sides of the ladder leg 14 and is parallel to the columns 15.
9 and a total of four support portions 20 for fixing the handrail body 19 to the support 15.

As shown in FIG. 3, of the left and right handrail members 17L and 17R provided on the ladder leg 14, the support portion 20 of one of the handrail members 17L moves away from the support 15 of the ladder leg 14 as the distance from the support 15 increases. It is attached in a state that it is slightly inclined in the direction that spreads outward in the width direction. That is,
In FIG. 3, the support portion 20 of the left handrail member 17L is
The upper side is inclined so as to spread outward in the width direction.

For this reason, as shown in FIG.
The ladder leg 14 is placed on the ground with the 7L and 17R facing upward, and the ladder portion 22 composed of the struts 14 and 14 and the stepping bar 16 of the next ladder leg 14 is moved to the left and right handrail members 17L and 17L.
By placing it between the 17Rs,
A large number of ladder legs 14 (eight stacked in FIG. 3) can be stacked in multiple layers.

As described above, according to the ladder leg 14 of the present embodiment, a large number of the ladder legs 14 can be appropriately stacked, so that the ladder legs 14 can be efficiently transported and stored. Further, in the present embodiment, the support portion 20 of the right handrail member 17R in FIG. 3 includes a guide portion 21 formed by bending only the front end portion with a large inclination.
The guide function of the guide portion 21 makes it easy to guide the ladder portion 22 of the ladder leg 14 to be stacked between the handrail members 17L and 17R of the ladder leg 14 already placed.

Further, the right handrail member 17R in FIG.
Is mounted such that portions other than the guide portion 21 are perpendicular to the ladder portion 22. For this reason, if the struts 15 of the ladder part 22 are pressed against the right handrail member 17R when the ladder legs 14 are stacked, the ladder legs 1 can be shifted as little as possible.
4 can be stacked accurately.

FIGS. 4 and 5 show a reinforcing bar assembling work scaffold 26 according to a second embodiment of the present invention. The second work scaffold 26 has a rectangular ceiling on which a worker M can ride. A plate 27 and one ladder leg 28 having an upper end connected to a peripheral portion of the top plate 27 and having a length greater than the height H of the vertical wall portion 13 of the reinforced structure 5, and fixed to the top plate 27; And an engaging portion 31 that detachably engages with the horizontal rail 30 of the existing scaffolding device 29.

The top plate 27 is provided with the first work scaffold 1.
It is made of metal such as aluminum or steel as in the case of 1,
The top plate 27 in this case is configured by closing the inside of the rectangular frame with a mesh plate. On the other hand,
The ladder leg 28 is made of a metal material such as aluminum or steel, as in the case of the first working scaffold 11, and includes a pair of right and left columns 15 parallel to each other and a plurality of step bars 16 connecting the columns 15 to each other. And a handrail member 17 connected to each of the struts 15 of the ladder portion 22.

As shown in FIG. 4, the ladder leg 28 is attached to a corner of the top plate 27 by welding or the like.
3 by fixing the upper end of the support 15 with bolts, etc.
The top plate 27 is detachably attached to the top plate 27, and the top plate 27 and the column 15 are connected to each other by a diagonal member 34 for reinforcement. The ladder portion 22 of the second work scaffold 26 is fixed to the top plate 27 at an attachment angle of about 70 degrees. Also, the handrail member 1 of the second work scaffold 26
7 is attached to the ladder part 22 in an inclined state as shown in FIG.

The engaging portion 31 is made of a plate material having a substantially semicircular engaging groove which can be just fitted into the pipe material of the existing scaffolding device 29. As shown in FIGS.
A pair of left and right is provided at the end of the top plate 27 opposite to the ladder leg 28 so that the engagement groove faces downward. As shown in FIG. 4, the ladder leg 2 of the second work scaffold 26
Adjustment means 35 for adjusting the length of the ladder leg 28 is provided at a lower portion of the ladder leg 8. This adjusting means 35
Auxiliary ladder 36 slidably provided below ladder section 8
And a fixing member (not shown) for positioning the auxiliary ladder 36 with respect to the ladder portion 8.

Therefore, according to the second work scaffold 26, even if the height of the scaffolding device 29 changes, the length of the ladder leg 28 is adjusted by adjusting the projecting amount of the auxiliary ladder 36. , Can be appropriately installed such that the top plate 27 is horizontal. In addition, the adjusting means 35 of FIG. 4 can be adopted also for the ladder leg 14 of the first working scaffold 11.

FIGS. 6 to 8 show a construction method of the reinforcing bar structure 5 performed when the first and second work scaffolds 11 and 26 are actually used on the site. This reinforced structure 5
Is for a caisson foundation made of the reinforced concrete illustrated in FIG. 10, and has a group of outer wall reinforcing bars 5 </ b> A formed in a rectangular frame shape in plan view and constituting the outer peripheral portion of the caisson 1. Inner wall rebar group 5B arranged in a grid
And

That is, in the reinforcing bar structure 5, a group of vertical reinforcing bars 3 in which a number of vertical reinforcing bars 2 are erected at predetermined intervals are arranged along a grid-shaped section line in plan view. By connecting the horizontal bar 4 to the arranged vertical bar group 3, a vertical wall portion 13 including vertical and horizontal bars 2 and 4 is provided. As shown in FIG. 6, the first work scaffold 11 is installed for the worker M to move between the sections 9A and 9B inside the caisson 1. That is, the first work scaffold 1
1 is suspended by a crane or the like via a wire 37, and is arranged such that the top plate 12 constituting the radiation center of the ladder leg 14 is almost directly above the grid point P of the section line (see FIG. 2). .

Thereafter, the first working scaffold 11 is arranged by disposing each ladder leg 14 in each of the sections 9A and 9B in a state where the angle with respect to the vertical wall portion 13 in plan view is shifted by approximately 45 degrees. Each of the sections 9A and 9B is erected on the ground. In this case, the four ladder legs 14 arranged radially are arranged in each of the sections 9A and 9B around the grid point P, so that only one work scaffold 11 is installed and the work is performed. The person M can come and go in the four sections 9A and 9B partitioned by the inner wall reinforcing bar group 5B.

Accordingly, as shown in FIG. 8, according to the first working scaffold 11, the number of scaffolds to be installed is greatly reduced as compared with the case where the scaffold such as the bifurcated stepladder 38 straddles the inner wall reinforcing bar group 5B. be able to. That is, FIGS. 8A and 8B show a caisson 1 having a total of 16 sections 9A and 9B,
8A shows the layout of the first work scaffold 11 necessary to move back and forth through all the sections 9A and 9B in the caisson 1, and FIG.
The layout of the bifurcated stepladder 38 required to move back and forth between all the sections 9A and 9B is shown.

As shown in FIG. 8B, in the means for straddling the inner wall reinforcing bar group 5B by the forked stepladder 38, two sections 9A and 9B adjacent to each other via the inner wall reinforcing bar group 5B by one stepladder 38.
16 sections 9
In the case of the caisson 1 having A and 9B, a total of 24 bifurcated stepladders 38 need to be installed in the caisson 1. On the other hand, in the work scaffold 11 of the present embodiment, four sections 9A and 9B around the grid point P can be moved back and forth by one work scaffold 11, so that 16 sections 9A and 9B are provided.
In the case of the caisson 1, it is sufficient to install the number of the grid points P, that is, nine work platforms 11 in the caisson 1.

The first work scaffold 11 is shown in FIG.
As shown by the broken line in (a), by arranging it so as to straddle the outer reinforcing bar group 5A, it can be used to move from the outside 9C of the caisson 1 to the section 9A just inside the outer reinforcing bar group 5A. On the other hand, as shown in FIG. 7, the worker M
From the outside to the section 9A immediately inside the outer wall rebar group 5A.

That is, the second work scaffold 26 is suspended by a crane or the like via a wire, and the engaging portion 31 of the work scaffold 26 is connected to the existing scaffold device 29 which is erected on the outside 9C of the caisson 1. Of the ladder leg 2
8 is erected in the caisson 1 so as to be disposed in a section 9A immediately inside the outer wall reinforcing bar group 5A. As described above, according to the second working scaffold 26, the engaging portion 31 that detachably engages with the horizontal rail 30 of the existing scaffolding device 29 is fixed to the top plate 27 having the ladder legs 28, The second work scaffold 26 is attached to the existing scaffolding device 29 simply by engaging the engaging portion 31 of the second working scaffold 26 suspended by a crane or the like with the horizontal rail 30 of the existing scaffolding device 29. be able to.

Therefore, if this second work scaffold 26 is used, the scaffold floor (top plate 27) for the existing scaffolding device 26
Installation and the ladder (ladder leg 28) can be performed at once, and the labor for constructing the scaffold in the rebar assembling work can be reduced. In the second working scaffold 26 of FIGS. 4 and 5, only one ladder leg 28 is provided. However, as shown in FIG. Or three or more wires may be provided.

As described above, the ladder leg 2 is
If a plurality of sections 8A are provided, as shown in FIG.
You can come and go to A. In addition, in the first work scaffold 11 of FIGS. 1 to 3, the caisson 1 has four ladder legs 14 corresponding to the square lattice shape,
The number is not limited to four.

That is, the ladder leg 1 of the first working scaffold 11
The number 4 may be three or more, and may be three or more radially arranged with respect to the top plate 12 corresponding to the lattice shape of the caisson 1.

[0039]

As described above, according to the present invention,
By installing only one scaffold, it becomes possible to move back and forth between three or more sections partitioned by the outer wall or inner wall reinforcing bar group, so that it is possible to reduce the labor for constructing the scaffold in the rebar assembling work. Further, according to the present invention, since the installation of the scaffold floor and the installation of the ladder to the existing scaffolding device can be performed at the same time, it is possible to reduce the labor for constructing the scaffold in the rebar assembling work.

[Brief description of the drawings]

FIG. 1 is a front view of a first working scaffold.

FIG. 2 is a plan view of a first working scaffold.

FIG. 3 is a side view showing a stacked state of ladder legs of a first working scaffold.

FIG. 4A is a front view of a second working scaffold,
(B) is a partially broken front view showing the adjusting means provided at the lower part.

FIG. 5 is a plan view of a second working scaffold.

FIG. 6 is a side view of the inside of a caisson showing a construction method using a first work scaffold.

FIG. 7 is a side view of the inside of a caisson showing a construction method using a second work scaffold.

FIG. 8A is a plan view of a caisson showing a layout of a first working scaffold, and FIG. 8B is a plan view of a caisson showing a layout of a bifurcated stepladder.

FIG. 9 is a schematic plan view showing a modification of the second working scaffold.

FIG. 10 is a perspective view showing a schematic structure of a caisson.

FIG. 11 is a side view of the inside of a caisson showing a conventional construction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Caisson 2 Vertical reinforcing bar 3 Vertical reinforcing bar group 4 Transverse bar 5 Reinforcement structure 11 First work scaffolding 12 Top plate 13 Vertical wall portion 15 Prop 16 Stepping bar 17 Handrail member 26 Second working scaffold 27 Top plate 28 Ladder leg 29 Existing Scaffolding device 31 Engagement part H Height M Worker

Claims (8)

(57) [Claims] 1. A plurality of inclined ladder legs (14) having upper ends connected to each other and having a length greater than the height (H) of a vertical wall portion (13) of a reinforced structure (5). Prepared,
A rebar assembling work scaffold characterized in that the plurality of ladder legs (14) are radially arranged in three or more forks in plan view. 2. A top plate (12) on which a worker (M) can ride, wherein upper ends of a plurality of ladder legs (14) are respectively connected to a peripheral portion of the top plate (12). Item 4. The rebar assembling work scaffold according to Item 1. 3. A top plate (27) on which a worker (M) can ride, and a vertical wall portion (13) of which the upper end is connected to a peripheral portion of the top plate (27) and which is a reinforcing bar structure (5). Height (H)
A ladder legs (28) having a length greater than, equipped with an engaging part engaged (31) detachably to the top plate is fixed to (27) and existing scaffold (29), wherein The ladder leg (28) includes a pair of right and left columns (15),
Steps (1) connecting the columns (15) of
6) and handrails respectively connected to the columns (15)
A member (17), wherein the handrail member (17) is separated from the support (16).
In the direction of spreading in the width direction of the ladder leg (28) according to
Rebar assembly characterized by being formed in an inclined shape
Working scaffold. 4. A ladder leg (14 ) includes a pair of right and left columns (1).
5), a plurality of step bars (16) connecting the columns (15) to each other, and handrail members (17) respectively connected to the columns (15). 3. The rebar assembling work scaffold according to claim 1, wherein the at least one is formed so as to be inclined in a direction in which the ladder leg (14 ) spreads in a width direction of the ladder leg (14 ) as moving away from the support (16). 5. An adjusting means (3) for adjusting the length of the ladder legs (14) (28) below the ladder legs (14) (28).
The rebar assembling work scaffold according to any one of claims 1 to 4, wherein 5) is provided. 6. A group of vertical reinforcing bars (3), each having a number of vertical reinforcing bars (2) erected at predetermined intervals, are arranged along a grid-shaped section line in plan view, and are arranged in the grid. Claims: A method of constructing a reinforcing steel structure, wherein a vertical wall portion (13) comprising vertical and horizontal reinforcing bars (2) and (4) is constructed by connecting a horizontal reinforcing bar (4) to a vertical reinforcing bar group (3). The rebar assembling work scaffold (11) according to 1 or 2,
Each ladder leg (14) is a grid point (P) of the section line.
A method for constructing a reinforced structure, comprising standing upright so as to be disposed in each of the surrounding sections (9A) (9B). 7. A ladder leg (28) and an existing scaffolding device (2).
9) the engaging portion (31) detachably engaged with the
(M) is provided on the top plate (27) on which the
An existing scaffolding device (29) having the engaging portion (31) of the second working scaffold (26) erected outside the outer periphery of the division line.
And the ladder legs (2) of this second working scaffold (26)
8) is a section (9) inside the outer periphery of the section line.
A) the second working scaffold (26) to be located in
The method for constructing a reinforced structure according to claim 6, wherein the erected structure is erected. Claim 8. Numerous vertical reinforcing bars (2) stand at predetermined intervals
The vertical reinforcing bar group (3) that has been set
Vertical irons arranged along the drawing line and arranged in a grid
By connecting the horizontal muscle (4) to the muscle group (3),
Build a vertical wall (13) consisting of reinforcing bars (2) and (4)
In the construction method of the sea reinforced structure, Detachable to multiple ladder legs (28) and existing scaffolding equipment (29)
The worker (M) rides on the engaging portion (31) which freely engages.
For assembling rebars provided on a top plate (27)
The engaging portion (31) of the scaffold (26) is
It relates to the existing scaffolding device (29) erected outside the outer periphery.
And Each of the ladder legs (28) of this work scaffold (26) is
A plurality of sections (9A) (9) inside the outer periphery of the image line
A) The work scaffold (2)
6) Construction method of reinforced structure characterized by erecting
Law.