JP3140674U - Tie bar holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tie bar holder capable of easily and appropriately installing a tie bar embedded in concrete for connecting reinforcing bars of reinforced concrete.
A tie bar holder for holding a tie bar 3 embedded in concrete together with a main reinforcing bar 2 in which vertical bars 21 and horizontal bars 22 are assembled in a lattice shape. The tie bar holder 1 has a beam part 11 spanned between at least two adjacent vertical bars 21,... And support parts 12 and 12 for supporting the tie bar 3 so as to be slidable in the axial direction. Configured. The support portions 12 and 12 are provided orthogonal to the beam portion 11 and opposite to both ends of the beam portion 11, and through holes 12A and 12A through which the tie bar 3 passes are formed in both the support portions 12 and 12. Is done.
[Selection] Figure 1

Description

  The present invention relates to a holding tool for a tie bar for connecting reinforcing bars used when constructing a reinforced concrete structure.

  Conventionally, in concrete pavement, if the entire width cannot be constructed at one time to allow one-way traffic, construction up to an arbitrary middle point of the pavement width is performed in advance, and then the remaining work area is constructed. .

  Such a method is called half construction, but in half construction, a tie bar is added to the internal reinforcing bar structure in order to ensure continuity between the pre-construction concrete plate and the post-construction concrete plate.

  Specifically, in addition to constructing the main rebar by assembling the vertical and horizontal bars in a lattice shape at a height of 2/3 of the pavement thickness along the concrete placement surface, the main reinforcement will be attached to the edge on the post-construction side. A plurality of tie bars are arranged in an orthogonal state.

  In general, inexpensive reinforcing bar spacers are used to maintain the height of the main rebar, but the tie bar is installed at about half the pavement thickness, so it is separate from the spacer that supports the main rebar for its holding. Is used (for example, Patent Document 1).

  However, it is extremely difficult to accurately place all tie bars in place, and when the concrete is placed, all the tie bars are buried in the concrete, which may hinder the connection with the concrete slab after the construction.

  Therefore, in Patent Document 1, a coupler is attached to one end male thread portion of a tie bar before placing concrete, and the coupler is removed after the concrete is hardened so that one end of the tie bar is exposed so as to be connectable with a tie bar for subsequent construction. I have to.

JP-A-10-195810

  However, even in Patent Document 1, the tie bars must be aligned in a state where the end face of the coupler hits the concrete mold, and there is a problem that much time and labor are consumed for the work.

  In addition, if the concrete formwork is installed before assembling the reinforcing bars and the coupler is brought into contact with this, the tie bars can be aligned. However, if the concrete formwork is installed first, the assembly of the main reinforcing bars and the tie bars It is difficult to install and causes work efficiency to deteriorate.

  According to Patent Document 1, although tie bars can be connected to each other by removing the couplers, it is not easy to remove the couplers one by one from many tie bars.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a novel tie bar holder capable of easily and appropriately installing a tie bar.

In order to achieve the above object, the present invention
A tie bar holding tool for holding a tie bar embedded in concrete together with a main reinforcing bar formed by assembling vertical and horizontal bars in a grid pattern,
A beam portion spanned between at least two adjacent vertical bars having a predetermined length, and a support portion for slidably supporting the tie bar in its axial direction,
The support portion is provided perpendicularly to the beam portion and opposite to both ends of the beam portion, and a through-hole through which the tie bar passes is formed in both the support portions. .

  In the tie bar holder as described above, the length of the beam portion is 200 to 350 mm.

  The tie bar holder according to the present invention is provided with support portions having through holes at both ends of a beam portion spanned between the vertical bars, and the tie bars passed through the through holes of both support portions slide in the axial direction. Since the plurality of tie bars are held at a certain height, the respective tie bars can be moved in the axial direction to easily and quickly align one end.

  In addition, the pair of support portions are provided perpendicular to the beam portion spanned by the longitudinal bars constituting the main reinforcing bar and opposite to both ends of the beam portion. Since the tie bar is supported by the two support portions in a state of being hung below the main reinforcing bar, it is possible to prevent the rattling of the portion at the time of placing concrete as in the past. The stand that supports the tie bar from below does not fall down, and the tie bar can be maintained at a constant height even when placing concrete.

  Furthermore, according to the tie bar holder of the present invention, it is possible to reduce the unit price with a simple structure in which support portions having through holes formed at both ends of the beam portion are provided, and it is embedded in the concrete while holding the tie bar. The concrete strength can be increased.

  In addition, since the length of the beam part (interval between the support parts) is 200 to 350 mm, even a tie bar having a large overall length is stably supported by a pair of support parts provided at both ends of the beam part in a both-sided state. can do.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a tie bar holder according to the present invention partially cut away, and FIG. 2 shows a longitudinal section of the holder.

  The configuration example of the tie bar holder 1 will be described with reference to FIGS. 1 and 2. The tie bar holder 1 of this example is a U-shaped form obtained by bending a metal plate punched into a predetermined shape, and is continuous in the left-right direction. The portion to be formed is a strip-shaped beam portion 11 having a predetermined length, and thin support portions 12 and 12 that are bent downward at a right angle are formed opposite to each other at both ends of the beam portion 11.

  Further, the through-holes 12A and 12A that are circular on the same straight line parallel to the beam portion 11 are formed in the support portions 12 and 12 that face each other.

  In this example, the diameter of the through hole 12A is 23 to 25 mm, and the distance between the centers of the through hole 12A and the beam portion 11 is 20 to 30 mm. In addition, the length L of the beam portion 11 (interval between the support portions 12 and 12) is 350 mm in this example (changed in the range of 200 to 350 mm according to the pitch of vertical stripes described later).

  The tie bar holder 1 configured as described above is inserted into a through hole 12A, 12A of the support portions 12, 12 facing each other, and a tie bar described later is inserted into the tie bar holder 1 so that the tie bar can slide in the axial direction. Can be supported.

  FIG. 3 is a schematic plan view showing a part of a reinforcing bar structure in which the tie bar holder 1 configured as described above is arranged. In FIG. 3, 2 is a main reinforcing bar embedded in concrete as reinforced concrete, and this main reinforcing bar 2 uses a plurality of vertical bars 21 and horizontal bars 22 and is formed in a lattice shape along the concrete placement surface (in this example, the roadbed). And is supported at a predetermined height by a reinforcing bar spacer (not shown) disposed on the roadbed.

  The vertical bars 21 and the horizontal bars 22 are steel bars (for example, deformed steel bars) having a predetermined length, and they are orthogonal to each other and their intersecting portions are connected by a number line or the like. In this example, the interval (pitch) between the vertical bars 21 is 150 mm, and the interval (pitch) between the horizontal bars 22 is 300 mm.

  In particular, a plurality of the tie bar holders 1 are arranged on one end edge of the main rebar 2. In this example, each tie bar holder 1 has its beam portion 11 spanned between a plurality of (three in the illustrated example) vertical bars 21 parallel to the horizontal bars 22. The tie bar 3 is inserted into the through holes 12A and 12A in the pair of left and right support portions 12 and 12 that hang down from both ends of the beam portion 11 toward the roadbed. 22 is slidable in the horizontal direction and supported horizontally.

  The pair of left and right support portions 12 and 12 serve to hold the tie bar 3 at a predetermined height between the main reinforcing bar 2 and the roadbed, and the length of the horizontal bar 22 with a plurality of vertical bars 21 interposed therebetween. It plays a role of maintaining the beam portion 11 in an orthogonal state with respect to the longitudinal bars 21 while restricting the movement of the beam portion 11 with respect to the direction.

  Here, the tie bar 3 is a steel bar having the same diameter as the longitudinal bars 21 or thicker than that of the vertical bars 21 (in this example, a diameter of 22 mm and a length of 500 mm), and a socket-like nut member 31 is fixed to one end thereof. The tie bar 3 is held in a state in which the nut member 31 protrudes to the outside of the main reinforcing bar 2. When the reinforcing bar structure including the tie bar 3 is embedded in the concrete, the screw hole of the nut member 31 is blocked by the concrete. Not to be.

  FIG. 4 shows a partial cross section of a concrete plate (concrete paving plate) constructed using a reinforcing bar structure composed of the tie bar holder 1, the main rebar 2, and the tie bar 3 as described above.

  In FIG. 4, 4 is a roadbed, 5 is a concrete pavement plate that is constructed in advance on one side in the width direction of the roadbed 4, and 6 is a concrete pavement plate that is constructed after the concrete pavement plate 5 is constructed. , 6 are connected by tie bars 3, 7 embedded therein to ensure continuity.

  The tie bar 7 embedded in the post-installed pavement plate 6 has a male screw portion at one end thereof and is screw-coupled to a nut member 31 fixed to one end of the other tie bar 3.

  Here, in order to pave the concrete on the roadbed 4 as shown in FIG. 4, the width direction one side is blocked and the other side is allowed to pass.

  Then, the main reinforcing bar 2 is constructed by assembling the vertical bars 21 and the horizontal bars 22 in a lattice shape on the upper part along the roadbed 4 on one side, which is closed, and a reinforcing bar spacer (not shown) is arranged at an appropriate position to arrange the reinforcing bar spacer. The main rebar 2 is supported at a predetermined height.

  After that, the tie bar holder 1 is arranged on the main rebar 2 (the beam portion 11 is installed between the longitudinal bars 21,...) At the center in the width direction of the roadbed 4 (unconstructed vehicle traffic side) and then supported. The tie bar 3 is inserted into the through holes 12A and 12A of the portions 12 and 12, and the nut member 31 fixed to one end thereof is projected from the arrangement region of the main rebar 2 to the unconstructed vehicle passage side.

  At this time, a concrete mold (not shown) may be arranged so that the nut member 31 is abutted against the mold. In this example, the protruding amount of the nut member 31 is generally larger by several centimeters than the reference. Keep it.

  Then, in a traffic lane on the unconstructed side, a self-propelled concrete molding machine with a mold having a side wall plate 8 as shown in FIG. 5 is run, and the tie bar 3 is pushed in by the side wall plate 8 and the rebar including the tie bar 3 Concrete is continuously placed on the structure, and the upper surface thereof is leveled by a mold top plate (not shown) continuous with the side wall plate 8. Here, instead of pushing the tie bar 3 by the side wall plate 8 of the mold, an operator may sequentially pull out each tie bar 3 toward the side wall plate 8.

  As a result, the concrete pavement plate 5 is constructed on one side of the roadbed 4. After the concrete is hardened, the vehicle is allowed to pass on the pavement plate 5 side, while the same reinforcing bar structure is constructed on the non-worked side. Then, concrete is placed and a concrete pavement plate 6 integrated with the previously installed pavement plate 5 is constructed. In addition, the reinforced bar on the post-construction side uses a tie bar 7 having an external thread at one end, and the concrete is placed in a state in which this is screwed into the nut member 31 that appears on the side of the pre-construction pavement plate 5. .

  As mentioned above, although embodiment of this invention was described, the tie bar holder which concerns is not restricted to the said example, It can also be set as a form like FIG. In FIG. 6, the beam portion 11 is constituted by two parallel linear members (round shafts). In FIG. 6, the support portion 12 is composed of a shaft portion 12B formed by bending both ends of a linear material constituting the beam portion 11 at a right angle, and a ring 12C fixed to the lower end thereof. Is a through hole 12A through which the tie bar passes. In the tie bar holder as shown in FIG. 6, the beam portion 11 is bridged between the vertical bars, and the tie bar is passed through the through hole 12A (inside the ring 12C) of the support portion 12 hanging from both ends thereof. Can be slidably supported in the axial direction.

The perspective view which shows the tie bar holder which concerns on this invention Vertical section of the tie bar holder Schematic plan view showing a part of the main reinforcing bar with the tie bar holder Cross section of concrete pavement with main reinforcement and tie bar embedded Explanatory drawing showing the mode when placing concrete The perspective view which shows the example of a change of the tie bar holder which concerns on this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tie bar holder 11 Beam part 12 Support part 12A Through-hole 2 Main reinforcing bar 21 Vertical bar 22 Horizontal bar 3 Tie bar 31 Nut member 4 Roadbed 5 Concrete pavement plate

Claims (2)

A tie bar holding tool for holding a tie bar embedded in concrete together with a main reinforcing bar formed by assembling vertical and horizontal bars in a grid pattern,
A beam portion spanned between at least two adjacent vertical bars having a predetermined length, and a support portion for slidably supporting the tie bar in its axial direction,
The support portion is provided perpendicularly to the beam portion and opposite to both ends of the beam portion, and a through-hole through which the tie bar passes is formed in both the support portions. Tie bar holder.   The tie bar holder according to claim 1, wherein a length of the beam portion is 200 to 350 mm.

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