JP4307971B2 - Crossing fixing structure - Google Patents

Description

The present invention relates to a crossing portion fixing structure using a crossing portion fixing jig that fixes a crossing portion in which reinforcing members that reinforce a structure cross each other.

  A reinforced concrete structure is constructed by placing reinforcing bars in a formwork and then placing concrete in the formwork. If the bar arrangement is disturbed by the impact of concrete placement or the pressure of ready-mixed concrete, or if it moves from a specified position, the strength and rigidity as designed cannot be obtained. The crossing portion is fixed by winding the binding wire, and the reinforcing bars are fixed at the crossing portion so as not to be displaced or disturbed. For example, Patent Document 1 describes a method of winding a binding wire at an intersection of reinforcing bars.

By the way, in recent years, reinforcing bars (materials) made of FRP which are high in strength and light weight are incorporated in various concrete structures instead of reinforcing bars. For example, in the NOMST (Novel Material Shield-cuttable Tunnel-wall) method adopted when constructing a tunnel, a shaft is built at the starting position and the reaching position of the shield, and this shaft is cut directly with a shield. In the mirror cutting part of this shaft, the caisson incorporates reinforcing bars such as FRP main bars, band bars and shear bars.
Such a reinforcing bar (material) made of FRP may be formed in a strip shape in which the cross section (transverse section) is formed in a rectangular shape, unlike a round bar-shaped reinforcing bar.
JP 2003-13548 A

It is difficult and time-consuming to fix the reinforcing members at the intersections by wrapping a binding wire such as a conventional number wire around the intersections where the reinforcing members having a rectangular cross section as described above are crossed. there were.
That is, since the reinforcing material is in the shape of a strip having a rectangular cross section, the thickness and width are different. Therefore, for example, when reinforcing members having a thickness smaller than the width are crossed, the other reinforcing material is brought into contact with the thin surface in the thickness direction of one reinforcing member to cross each other, and a binding wire is wound around the crossing portion. At this time, it is easy for the reinforcing material to fall with the contact surface as a fulcrum, so that it takes time and effort to position and fix the reinforcing material at the intersection while maintaining a predetermined posture.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an intersecting portion fixing jig and an intersecting portion fixing structure capable of easily and reliably fixing an intersecting portion in which reinforcing members having a rectangular cross section intersect each other. It is said.

In order to solve the above problems, the present invention , for example, as shown in FIG. 1 to FIG. 5, an intersection that fixes an intersection that intersects reinforcing members (horizontal bars 10 and vertical bars 11) having a rectangular cross section. A fixing jig 1, which is a jig body 2 and a first fitting groove 3 formed on the surface side of the jig body 2 and into which an intersecting portion of the one reinforcing material (horizontal bar 10) is fitted. And a second fitting groove 4 that is formed on the back side of the jig body 2 and into which an intersecting portion of the other reinforcing material (vertical reinforcement 11) is fitted,
The first fitting groove 3 and the second fitting groove 4 intersect each other.

The jig body is preferably formed of a resin such as ABS resin or vinyl chloride, but is not limited thereto. When the intersection fixing jig of the present invention is used at the intersection of reinforcing bars (stiffeners) of the shaft wall constructed by the above-described NOMST method, the strength is such that it can be easily cut with a cutter of a shield machine. Anything that has
Moreover, what is necessary is just to set the crossing angle of a 1st fitting groove and a 2nd fitting groove equal to the crossing angle in the crossing part of reinforcement materials.
Furthermore, when the jig body is formed of a material having a certain degree of elasticity such as resin, the groove widths of the first fitting groove and the second fitting groove are set slightly narrower than the width of the reinforcing material. It is desirable to fit the reinforcing material by elastically pushing it into the first and second fitting grooves.
In addition, the reinforcing members can be fixed without using a binding member such as a number wire by attaching a claw or a lid to the first fitting groove or the second fitting groove of the jig body. it can.

According to the present invention , the jig body is disposed at the intersection where one reinforcing material and the other reinforcing material intersect, and the intersecting portion of the one reinforcing material is fitted into the first fitting groove of the jig body. Then, by fitting the intersecting part of the other reinforcing material into the second fitting groove, both reinforcing materials can be positioned while maintaining a predetermined posture and can be easily and reliably fixed at the intersecting portion.

Moreover, the present invention provides the intersection fixing structure according to claim 1,
The first fitting groove 3 and the second fitting groove 4 are orthogonal to each other.

When the reinforcing material is used as a reinforcing bar for a wall of a shaft constructed by the NOMST method, for example, one reinforcing material becomes a horizontal reinforcing bar and the other reinforcing material becomes a vertical reinforcing bar.
Therefore, according to the present invention , since the first fitting groove and the second fitting groove are orthogonal to each other, the reinforcing bars are in a predetermined posture at the intersection between the horizontal bars and the vertical bars as described above. It can be easily and reliably fixed by positioning while holding.

Moreover, the present invention provides the intersection fixing structure according to claim 1 or 2,
The bottom surface 3a of the first fitting groove 3 and the bottom surface 4a of the second fitting groove 4 are located on the same plane.

According to the present invention , since the bottom surface of the first fitting groove and the bottom surface of the second fitting groove are located on the same plane, one reinforcing material and the other reinforcing material are brought into contact with each other at the intersection. Can be touched. Therefore, there is no gap between the reinforcing members at the intersection, so that the reinforcing members can be positioned and fixed more reliably.
In addition, since there is a gap between the reinforcing members at the intersection, the reinforcing member can be reliably arranged at a predetermined position, and therefore the concrete can be placed so that the cover thickness is as designed.

Further, the present invention is an intersection fixing structure formed by fixing an intersecting portion in which reinforcing members (horizontal stripes 10, vertical stripes 11) having a rectangular cross section are intersected by an intersection fixing jig ,
The intersection fixing jig 1 is disposed at an intersection where one reinforcing member (horizontal reinforcement 10) and the other reinforcing member (vertical reinforcement 11) intersect,
The intersecting portion of the one reinforcing member (horizontal reinforcement 10) is fitted into the first fitting groove 3 of the intersection fixing jig 1, and the other reinforcing member (vertical reinforcement 11) is fitted into the second fitting groove 4. It is characterized in that the intersecting portions of are fitted.

According to the present invention , both the reinforcing members can be positioned while maintaining a predetermined posture by the first and second fitting grooves, and can be easily and reliably fixed at the intersection.

Further, the present invention provides the above crossing portion fixing structure,
In the intersection, the reinforcing members (horizontal bars 10 and vertical bars 11) are bound together by a binding member (binding band 15).

According to the present invention , the reinforcing members that cross each other are positioned and fixed at the crossing portion by the crossing portion fixing jig, and the reinforcing materials are bound by the binding member. It can prevent coming off from the fixing jig.
Therefore, it is possible to reliably prevent the reinforcing material from being disturbed or moved from a predetermined position due to an impact at the time of placing concrete, a pressure of ready-mixed concrete, or the like.

  According to the present invention, since the first fitting groove and the second fitting groove are formed in the jig body so as to intersect with each other, the intersecting portion of one reinforcing material is fitted into the first fitting groove. By fitting the intersecting portion of the other reinforcing material into the second fitting groove, both reinforcing materials can be positioned while maintaining a predetermined posture and can be easily and reliably fixed at the intersecting portion. And, by binding the reinforcing materials with the binding member, it is possible to prevent the reinforcing materials from being detached from the intersection fixing jig. Can be reliably prevented from moving out of a predetermined position.

In addition, by forming the first fitting groove and the second fitting groove orthogonally, the vertical and horizontal stripes used for the wall of the NOMST method or the like are positioned while maintaining the posture at the intersection. Can be fixed easily and securely.
Furthermore, by forming the bottom surface of the first fitting groove and the bottom surface of the second fitting groove on the same plane, one reinforcing material and the other reinforcing material can be brought into contact with each other at the intersection. Therefore, the reinforcing members can be positioned and fixed more reliably at the intersection.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 3 show an intersection fixing jig 1 according to the present invention. FIG. 1 is a perspective view thereof, FIG. 2 is a front view, and FIG. 3 is a rear view.

An intersection fixing jig 1 shown in these drawings is formed of ABS resin, and includes a jig body 2, a first fitting groove 3, and a second fitting groove 4.
The jig body 1 has a substantially cylindrical shape, and the first fitting groove 3 is formed on the surface side thereof. The first fitting groove 3 is formed by cutting out the surface side of the cylindrical ABS resin in a direction perpendicular to the axial direction, and is open to the surface side and the side surface side of the jig body 2. Yes. The first fitting groove 3 is adapted to be fitted with horizontal stripes described later.
A second fitting groove 4 is formed on the back side of the jig body 1. The second fitting groove 3 is formed by notching the back side of the cylindrical ABS resin in parallel with the axial direction, and is open to the back side and both end sides of the jig body 2. . The second fitting groove 4 is adapted to be fitted with vertical stripes described later.

The first fitting groove 3 and the second fitting groove 4 are orthogonal to each other, and the depths of the first fitting groove 3 and the second fitting groove 4 are equal and the jig body 2 has the same depth. The length is equal to the radius.
Since the first fitting groove 3 and the second fitting groove 4 have the same depth and the same length as the radius of the jig body 2, the bottom surface 3a of the first fitting groove 3 and The bottom surface 4 a of the second fitting groove 4 is located on the same plane passing through the diameter of the jig body 1. Further, since the bottom surface 3a and the bottom surface 4a are located on the same plane, a rectangular opening 5 is formed at the intersecting portion thereof.

FIG. 4 shows an example in which the intersection fixing jig 1 according to the present invention is used at the intersection of reinforcing bars of a shaft caisson for a NOMST method.
The reinforcing bar has a horizontal bar (one reinforcing member) 10 and a vertical bar (the other reinforcing member) 11. Since the vertical caisson for the shaft is formed in a cylindrical shape, the horizontal stripe 10 is formed in an arc shape and is disposed horizontally. The vertical stripes 11 are formed in a straight line and are arranged in the vertical direction.
As shown in FIG. 5, a plurality of concave grooves 12 extending in the width direction are formed on the surface of the reinforcing member having a rectangular cross section such as the horizontal stripes 10 and the vertical stripes 11 by embossing. The step of forming the concave groove 12 is performed after the “curing step”. By forming the concave groove 12 in this way, a large number of irregularities are formed on the surface of the reinforcing material. Therefore, high adhesion with concrete can be secured by the large number of irregularities.

As shown in FIG. 4, the horizontal stripes 10 and the vertical stripes 11 are orthogonal to each other, and these intersections are fixed by the intersection fixing jig 1. An enlarged view of this intersection is shown in FIG. As shown in FIG. 5, at the intersection of the horizontal bar 10 (one reinforcing member) and the vertical bar (the other reinforcing member) 11, the cross-section fixing jig 1 has its axis turned up and down, and the first The fitting groove 3 is arranged toward the outside (right side in FIG. 5).
In the first fitting groove 3, an intersecting portion of the horizontal bars 10 is fitted. The depth of the first fitting groove 3 is deeper than the thickness of the horizontal bar 10, and thus the horizontal bar 10 is completely fitted into the first fitting groove 3 at the intersection. Here, the width of the first fitting groove 3 is substantially equal to or slightly narrower than the horizontal stripe 10. Therefore, by pushing the horizontal bar 10 into the first fitting groove 3, the upper and lower surfaces of the horizontal bar 10 are elastically sandwiched between the inner surfaces of the first fitting groove 3, so that the horizontal bar 10 has the first fitting. It is fixed to the groove 3. Further, the horizontal stripe 10 is fitted in the first fitting groove 3 so that the back surface thereof is in contact with the bottom surface of the first fitting groove 3.

  On the other hand, the intersecting portion of the vertical stripes 11 is fitted in the second fitting groove 3. The depth of the second fitting groove 3 is shallower than the width of the vertical stripe 11, and thus the vertical stripe 11 protrudes inward from the second fitting groove 4 at the intersection. Here, the width of the second fitting groove 4 is substantially equal to or slightly narrower than the thickness of the vertical stripe 11. Therefore, by pushing the vertical stripe 11 into the second fitting groove 4, both side surfaces of the vertical stripe 11 are elastically sandwiched between the inner surfaces of the second fitting groove 4, so that the vertical stripe 11 is fitted into the second fitting groove 4. It is fixed to the groove 4. Further, the vertical stripe 11 is fitted in the second fitting groove 4 so that the side end surface thereof is in contact with the bottom surface of the second fitting groove 4.

As shown in FIG. 1, since the bottom surface 3a of the first fitting groove 3 and the bottom surface 4a of the second fitting groove 4 are located on the same plane, the first fitting groove 3 and the second fitting groove 3 The back surface of the horizontal bar 11 and the side end surface of the vertical bar 14 respectively fitted in the joint groove 4 are in contact with each other through an opening 5 formed in the jig body 2.
Therefore, since the horizontal stripes 10 and the vertical stripes 11 can be brought into contact with each other at the intersection, there is no gap between the horizontal stripes 10 and the vertical stripes 11 at the intersection, so that the horizontal stripes 10 and The vertical muscle 10 can be positioned and fixed.
Further, as shown in FIG. 4, after arranging horizontal bars 10, vertical bars 11, other reinforcing bars, etc., concrete is placed to construct a circular caisson for shafts. Since there is a gap between the vertical bars 11 and the vertical bars 11, the horizontal bars 10, the vertical bars 11 and the like can be reliably arranged at predetermined positions, so that the concrete can be placed so that the cover thickness is as designed.

As shown in FIG. 5, after the crossing portion of the horizontal streak 10 and the vertical streak 11 is positioned and fixed by the crossing portion fixing jig 1, the horizontal streak 10 and the vertical streak 11 are bound to a binding band (binding member) at the crossing portion. Bundle with 15.
Since the crossing fixing jig 1 positions and fixes the horizontal stripes 10 and the vertical stripes 11 that intersect each other, and the horizontal stripes 10 and the vertical stripes 11 are bound by the binding band 15. The horizontal bars 10 and the vertical bars 11 can be prevented from coming off from the intersection fixing jig. Therefore, it is possible to reliably prevent the horizontal bars 10 and the vertical bars 11 from being disturbed or moved from a predetermined position due to an impact at the time of placing concrete, a pressure of ready-mixed concrete, or the like.

  Thus, according to the present embodiment, the intersection fixing jig 1 is arranged at the intersection where the horizontal reinforcement (one reinforcing material) 10 and the vertical reinforcement (the other reinforcing material) 11 intersect, and the first By fitting the crossing part of the horizontal bars 10 into the first fitting groove 3 and fitting the crossing part of the vertical bars 11 into the second fitting groove 3, they are positioned while maintaining a predetermined posture and crossed. It can be easily and reliably fixed at the portion.

In the present embodiment, the first fitting groove 3 and the second fitting groove 4 of the intersecting portion fixing jig 1 are orthogonal to each other, but the intersecting portion of the reinforcing members that intersect at other than orthogonal is fixed. In the case, for example, as shown in FIG. 4, in the case where the crossing portion of the vertical reinforcing bar 11 and the arcuate reinforcing bar 16 intersecting the vertical reinforcing bar 11 is fixed on the back side of the vertical reinforcing bar 11, the first fitting is performed. The crossing angle between the joint groove and the second fitting groove may be set equal to the crossing angle at the crossing portion between the vertical bars 11 and the reinforcing bars 16.
Further, in the present embodiment, the case where the intersection fixing jig 1 is used for the intersection of the reinforcing bars of the circular caisson for shafts of the NOMST method has been described as an example. However, the present invention is not limited to this, and can be used, for example, at the intersections of reinforcing materials such as underground continuous walls, other various concrete structures, and marine structures.

An example of the intersection fixing jig according to the present invention is shown, and is a perspective view of the intersection fixing jig. FIG. FIG. It is a perspective view which shows the state which used the cross | intersection fixing jig concerning this invention for the cross | intersection part of a reinforcing bar. It is an enlarged view of the cross | intersection part in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intersection fixing jig 2 Jig body 3 First fitting groove 3a Bottom surface of first fitting groove 4 Second fitting groove 4a Bottom surface of second fitting groove 10 Horizontal bar (one reinforcing material)
11 Vertical reinforcement (the other reinforcement)
15 Binding band (binding member)

Claims (4)

An intersecting portion fixing structure formed by fixing an intersecting portion obtained by intersecting reinforcing members having a rectangular cross section with an intersecting portion fixing jig,
The intersection fixing jig is formed on the surface side of the jig body, the first fitting groove into which the intersection of the one reinforcing material is fitted, and the back surface of the jig body. A second fitting groove formed on the side and fitted with an intersecting portion of the other reinforcing material,
The first fitting groove and the second fitting groove intersect, and the intersecting portion fixing jig is disposed at an intersecting portion where one reinforcing material and the other reinforcing material intersect,
The intersecting portion of the one reinforcing member is fitted into the first fitting groove of the intersecting portion fixing jig, and the intersecting portion of the other reinforcing member is fitted into the second fitting groove,
The crossing portion fixing structure, wherein the reinforcing members are bound by a binding member at the crossing portion. In the intersection fixed structure according to claim 1,
The intersection fixing structure, wherein the first fitting groove and the second fitting groove are orthogonal to each other. In the intersection fixing structure according to claim 1 or 2,
The intersection fixing structure, wherein the bottom surface of the first fitting groove and the bottom surface of the second fitting groove are located on the same plane. The jig body is formed of a material having a certain degree of elasticity such as resin, the groove widths of the first fitting groove and the second fitting groove are set slightly narrower than the width of the reinforcing material, and the reinforcing material is The crossing portion fixing structure according to any one of claims 1 to 3, wherein the crossing portion fixing structure is fitted so as to be elastically pushed into the first and second fitting grooves.

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