JP2017075528A - Spacer for bar arrangement, and bar arrangement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spacer for bar arrangement, which enables simple execution of bar arrangement work, and a bar arrangement method.SOLUTION: In a bar arrangement method, a reinforcement 3 in the state of having a spacer 10 for bar arrangement suspended therefrom is lowered, and the reinforcement 3 is loaded on the erected spacer 10 for bar arrangement. The spacer 10 for bar arrangement has a body part 11 and a locking part 12. The body part 11 is composed of a columnar member with a flat bottom surface, which has a height corresponding to necessary covering thickness of the reinforcement 3. The locking part 12, which is protruded from a top surface of the body part 11, can be locked to the reinforcement 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bar arrangement spacer and a bar arrangement method.

For the purpose of preventing corrosion, the structural reinforcing bars need to be arranged at a position where a predetermined cover thickness is secured from the surface of the concrete structure.
The cover concrete part is generally formed so as not to contain metal etc. from the viewpoint of quality assurance, but for the purpose of preventing cracking of the surface layer part of the concrete structure, a small diameter rebar ( In some cases, crack control bars are placed.

Like the structural reinforcing bars, the crack control reinforcing bars need to be arranged at a position where a predetermined cover thickness is secured from the surface of the concrete structure for the purpose of preventing corrosion.
Therefore, when constructing a concrete structure, it is general to install a spacer between the reinforcing bar and the formwork to ensure the necessary cover thickness.

In a concrete structure in which reinforcing bars are arranged in two stages, such as structural reinforcing bars and crack control reinforcing bars, spacers for two-stage reinforcing bars are used.
As a spacer for two-stage reinforcement, for example, as shown in Patent Document 1, a mortar portion formed so that a lower reinforcement can be placed and a steel wire processing portion formed so that an upper reinforcement can be placed. There is a configured upper and lower streak spacer.
Further, Patent Document 2 discloses a reinforcing bar spacer formed so that a reinforcing bar can be placed and formed so as to be stacked in a plurality of stages.

JP 2011-12530 A Utility Model Registration No. 3167995

When two-stage reinforcement is performed using a conventional spacer, it is necessary to first assemble a lower reinforcement (crack control reinforcement). When the lower rebar is pre-assembled, the presence of the lower rebar becomes an obstacle in the assembly work of the upper rebar (structural rebar).
Moreover, it is necessary to carefully perform the assembly work of the upper rebar so that the lower rebar is not damaged or displaced.

As described above, it takes time and effort to arrange the spacers on the lower side of the reinforcing bars.
From such a viewpoint, an object of the present invention is to propose a bar arrangement spacer and a bar arrangement method that can easily perform the bar arrangement work.

  In order to solve the above-described problem, the spacer for bar arrangement of the present invention has a main body portion and a locking portion, and the main body portion has a height corresponding to the required cover thickness of the reinforcing bar. The reinforcing bars can be mounted on top, and the locking portion can be locked to the reinforcing bars.

  According to this bar arrangement spacer, since the predetermined cover thickness can be ensured by standing the reinforcing bar in a state of being engaged with the engagement portion, the arrangement work can be easily performed.

  Further, the bar arrangement method of the present invention is characterized in that the reinforcing bar in a state in which the bar arrangement spacer is hung is lowered, and the reinforcing bar is placed on the bar arrangement spacer that is erected.

  According to the bar arrangement spacer and bar arrangement method of the present invention, the bar arrangement work can be easily performed.

It is sectional drawing which shows the concrete structure of embodiment of this invention. It is a perspective view of the spacer for bar arrangement. (A) is a front view of a state in which the bar arrangement spacer is erected, and (b) is a front view of a state in which the bar arrangement spacer is tilted sideways. It is a figure which shows the temporary placement process of the bar arrangement method of this embodiment, Comprising: (a) is a front view, (b) is a longitudinal section. It is a figure which shows the same assembly process, Comprising: (a) is a front view, (b) is a longitudinal section. It is a figure which shows the same bar arrangement process, Comprising: (a) is a front view, (b) is a longitudinal section.

In the embodiment of the present invention, as shown in FIG. 1, a predetermined cover thickness (the cover thickness t ₂ for the lower rebar) is applied to the concrete cover portion of the structural rebar 2 (within the cover thickness t ₁ for the upper rebar). A bar arrangement spacer used when constructing the reinforced concrete structure 1 having the crack control bar 3 and the bar arrangement method using the bar arrangement spacer will be described.

As shown in FIG. 2, the bar arrangement spacer 10 includes a main body portion 11 and a locking portion 12. Both the main body 11 and the locking portion 12 are made of a non-corrosive material.
Body portion 11 is formed of a mortar made of a block having the same height as the lower reinforcement for head thickness t _2. The main body 11 of the present embodiment is a cube (quadrangular prism). However, the main body 11 has a flat bottom surface and a cover thickness necessary for the crack control rebar 3 (the cover thickness t ₂ for the lower rebar). It is not limited as long as it is a columnar member having a height corresponding to). For example, it may be a rectangular parallelepiped, a cylinder, or a frustum. Moreover, the material which comprises the main-body part 11 is not limited to mortar, For example, resin may be sufficient.

The locking portion 12 has a pair of saddle-shaped pieces 13 and 13 protruding from the upper surface of the main body portion 11. In addition, the latching | locking part 12 does not necessarily need to be saddle-shaped if latching to a reinforcing bar is possible. Although the latching | locking part 12 is resin, if the material which comprises the latching | locking part 12 is non-corrosive, it will not be limited to resin.
It is desirable to form the outer surface of each saddle-shaped piece 13 (the surface opposite to the other vertical-shaped piece 13) as close as possible to the extended surface of the side surface of the main body 11.

One end portion of the locking portion 12 protrudes from the upper surface of the main body portion 11, and the other end portion is embedded in the main body portion 11.
In addition, the latching | locking part 12 may be formed by embedding two independent saddle-shaped pieces 13 and 13 in the main-body part 11, respectively, and the lower part (part on the opposite side to an opening side) of a U-shaped member ) May be formed by embedding in the main body 11.

  One end portion of the saddle-shaped piece 13 is bent toward the center side (the other saddle-shaped piece 13 side) of the main body portion 11 and is formed so that the tip is lower than the upper end. The tip portions of the pair of saddle-shaped pieces 13 and 13 are inclined so that the distance between them decreases as it goes downward. That is, the tip portions of the pair of saddle-shaped pieces 13 and 13 have an inverted C shape. In the present embodiment, one end of the saddle-shaped piece 13 is bent in an arc shape, but the shape of the saddle-shaped piece 13 is not limited, and may be bent at an acute angle, for example.

A gap 14 smaller than the diameter of the crack control rebar 3 is formed between the tips of the pair of saddle-shaped pieces 13 and 13.
As shown in FIG. 3A, the crack control rebar 3 is inserted between the saddle-shaped pieces 13 by inserting the gap 14 therethrough. Since the width of the gap 14 is smaller than the diameter of the crack control bar 3, the crack control bar 3 inserted between the barb pieces 13 can be pulled up even if the barb piece 13 is pulled upward. The possibility of getting out of the gap 14 is low.

Hereinafter, a bar arrangement method using the bar arrangement spacer 10 will be described.
In this embodiment, the case where the reinforcing bars 2 and 3 (refer FIG. 1) of the lower surface side of the concrete structure 1 are arranged is illustrated.
The bar arrangement method of the present embodiment includes a temporary placement process, an assembly process, and a bar arrangement process.

As shown in FIGS. 4A and 4B, the temporary placement process is a process of temporarily placing the control rebar 3 cracked on a formwork or ground (hereinafter simply referred to as “floor surface 4”). .
In the temporary placement step, first, as shown in FIG. 3A, the bar arrangement spacer 10 is cracked and locked to the control rebar 3.

When the reinforcing bar 10 is locked to the reinforcing bar 3, the control reinforcing bar 3 is cracked from above the locking part 12 and inserted into the gap 14. When the tips of the pair of saddle-shaped pieces 13 and 13 are cracked and the outer peripheral surface of the control reinforcing bar 3 is pressed, the resin-made saddle-shaped piece 13 is placed outside (opposite side of the other saddle-shaped piece 13) so Since 14 is widened, the crack control rebar 3 passes through the gap 14.
The crack control rebar 3 that has passed through the gap 14 is arranged in a space surrounded by the locking portion 12.

Next, as shown in FIG. 3B and FIG. 4A, the reinforcing bar 3 for crack control is temporarily placed in a state where the spacer 10 for bar arrangement is tilted sideways.
The reinforcing bar 3 for crack control is disposed at a position close to the floor surface 4 by tilting the bar arrangement spacer 10 sideways.

  Subsequently, as shown in FIG. 4 (b), the crack control rebar 3b in a direction intersecting with the crack control rebar 3a to which the bar arrangement spacer 10 is locked is placed on the crack control rebar, The crack control rebar 3 is assembled in a grid pattern.

The assembly process is a process of assembling the structural rebar 2 above the crack control rebar 3 as shown in FIGS.
The structural reinforcing bars 2 are arranged in a lattice pattern at a predetermined pitch. At this time, since the crack control rebar 3 is temporarily placed at a position close to the floor surface 4, the distance between the crack control rebar 3 and the structural rebar 2 is set at a predetermined position. It becomes bigger than the state.

As shown in FIGS. 6A and 6B, the bar arrangement process is a process of arranging the cracking control reinforcing bar 3 below the structural reinforcing bar 2.
In the bar arrangement process, first, the bar arrangement spacer 10 is erected by pulling up the temporarily placed crack control rebar 3.

Next, in a state where the bar arrangement spacer 10 is erected (in a state where the bar arrangement spacer 10 is cracked and hung on the control rebar 3), the crack control rebar 3 is lowered, and the crack control rebar 3 is used for the bar arrangement. It is placed on the upper surface of the main body 11 of the spacer 10. When crack control is placed on the reinforcing bar spacer 10, a gap equivalent to the cover thickness t ₂ for the lower reinforcing bar is secured between the crack control reinforcing bar 3 and the floor surface 4.

As described above, according to the bar arrangement method of the present embodiment, a sufficient gap can be secured between the structural reinforcing bar 2 and the crack control reinforcing bar 3 when the structural reinforcing bar 2 is arranged. However, there is no hindrance to the arrangement of the structural rebar 2 and it is easy to work.
In addition, the crack control rebar can be arranged at a predetermined position only by erecting the bar arrangement spacer 10 that has been laid down at the time of arrangement of the structural rebar 2, so that the workability is excellent. .

  By tilting the bar arrangement spacer 10 to the side, the crack control rebar 3 to which the bar arrangement spacer 10 is locked is brought close to the floor surface 4. Even if the cracks are accidentally cracked and placed on the control rebar 3, the possibility that the crack control rebar 3 bends greatly is low.

  According to the bar arrangement spacer 10, the arrangement is such that it is difficult for the cracking control reinforcing bar 3 to fall off. Therefore, even if the crack control reinforcing bar 3 is pulled up in the bar arrangement process, the bar arrangement spacer 10 may fall. Absent.

The bar arrangement spacer 10 is excellent in workability because it only cracks the crack control rebar 3 in the bar arrangement process, and it is cracked by its own weight and rotates around the control bar 3 for controlling the crack, thereby providing a predetermined installation state.
Moreover, since the bar arrangement spacer 10 is made of a non-corrosive material, it does not corrode even if it is placed in the cover concrete.
Further, since the bar arrangement spacer 10 has a flat bottom surface, it is stable when erected.

  When the bar arrangement spacer 10 is used, the crack control bar 3 is arranged in the cover concrete of the structural rebar 2, so that the crack of the surface of the concrete structure 1 is controlled and the concrete structure 1 having excellent durability. Can be built.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.
The concrete structure formed using the bar arrangement method of this embodiment is not limited, For example, it can employ | adopt as a floor slab, a footing, a beam, etc.

  In the above-described embodiment, the case where a concrete structure having a crack control rebar is constructed has been described. However, a concrete structure to which the bar arrangement spacer and the bar arrangement method of the present invention can be applied does not necessarily have a crack control rebar. There is no need.

  In the above embodiment, the case where the lower rebar (crack control rebar 3) has a smaller diameter than the upper rebar (structural rebar 2) is described, but the rebar diameter of the upper and lower rebar is not limited, For example, the same rebar diameter may be sufficient.

  The locking portion 12 of the bar arrangement spacer 10 does not necessarily need to have the pair of saddle-shaped pieces 13 and 13 as long as the locking portion 12 can be locked to the crack control bar 3 (lower bar). For example, a single hook-shaped member may be used.

DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Structural reinforcement 3 Crack control reinforcement 10 Bar arrangement spacer 11 Main body part 12 Locking part 13 Vertical piece 14 Gap t ₁ Cover thickness for upper rebar t ₂ Cover thickness for lower rebar

Claims (2)

A bar arrangement spacer having a main body portion and a locking portion,
The main body has a height corresponding to the required cover thickness of the reinforcing bar, and can mount the reinforcing bar,
The reinforcing spacer can be locked to the reinforcing bar.   A reinforcing bar arrangement method comprising lowering a reinforcing bar in a state where the reinforcing bar spacer is hung, and placing the reinforcing bar on the reinforcing bar spacer.

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