JP2008050803A - Fixing implement, reinforced concrete structure, and manufacturing method for the reinforced concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing implement which enables a reinforcement and a reinforcing member to be firmly and easily fixed together without a deterioration in the quality of a material for the reinforcement, and to provide a reinforced concrete structure and a manufacturing method for the reinforced concrete structure. <P>SOLUTION: At least the side of one end of the fixing implement 30 is welded to a reinforcing ring 15 which is provided to a main reinforcement 11 (in a portion 31 to be welded). As in the case of the fixing implement 30, an engaging portion 33, which is engaged with the reinforcing ring 15, can also be provided on the side of the other end. The fixing implement 30 like this makes the main reinforcement 11 restrained between the fixing implement 30 and the reinforcing ring 15, so that the main reinforcement 11 and the reinforcing ring 15 can be firmly fixed together. Since the main reinforcement 11 and the reinforcing ring 15 are not welded together, the deterioration of the material for the main reinforcement 11 can be avoided and welding operations can be easily performed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fixture for fixing a reinforcing bar in a reinforced concrete structure, a reinforced concrete structure including the fixture, and a method for manufacturing the reinforced concrete structure.

  Conventionally, in the manufacture of reinforced concrete piles, reinforcing bar rods composed of main bars and hoop bars (or spiral bars) have been used. In order to ensure the rigidity of the reinforcing bar rod at the time of manufacturing, a reinforcing ring (reinforcing member) that connects the reinforcing bars is used. When joining this reinforcing ring to the reinforcing bar, it is thought that the highest rigidity can be ensured by the welding method, but it is pointed out that there is a risk of material deterioration of the reinforcing bar due to welding. Various kinds of hardware capable of joining a reinforcing bar without welding have been proposed (for example, Patent Documents 1 and 2).

The hardware described in Patent Document 1 includes a U-shaped member provided around a reinforcing bar at a crossing portion of the reinforcing bar and the reinforcing ring, a plate and an angle member through which both ends of the U-shaped member penetrate, and a U-shaped member. And two nuts respectively screwed to both ends of the member.
Moreover, the metal object of patent document 2 has spring property by bending of a wire, and the both ends are latched by a reinforcement ring and a reinforcing bar, respectively.

Japanese Patent Laying-Open No. 2006-046031 (FIG. 2) JP 2002-356845 A (FIG. 27)

  However, in a hardware such as Patent Document 1, members such as bolts and nuts are expensive, and plates and the like are required, which increases the number of parts, resulting in an increase in member costs. Moreover, since it takes time to attach the bolts and nuts, there is a problem that it takes a very long time to attach such a hardware to each reinforcing bar.

  On the other hand, in a hardware like Patent Document 2, it is difficult to bend after locking one end and then lock the other end, and in addition, from one end to the other end to increase the bonding force. Since it is necessary to increase the size or increase the diameter of the steel material, there is a problem that a large force is required for mounting and the work cannot be performed quickly. Moreover, in the case of this hardware, depending on the diameter and length dimensions of the steel material, there is a possibility that the hardware is displaced in the axial direction of the reinforcing bar.

  In view of such problems, an object of the present invention is to fix a reinforcing bar and a reinforcing member firmly and easily without deteriorating the material of the reinforcing bar, a reinforced concrete structure, and a method for manufacturing the reinforced concrete structure Is to provide.

  The fixture used for the reinforced concrete structure according to the present invention includes a restraining portion that restrains the reinforcing bar between the reinforcing member and the reinforcing member provided so as to intersect the reinforcing bar, and at least one end side is welded to the reinforcing member, thereby the reinforcing bar. Is fixed to the reinforcing member.

  In the method for manufacturing a reinforced concrete structure according to the present invention, at least one end side of a fixture for fixing a reinforcing bar to a reinforcing member provided so as to intersect with the reinforcing bar is welded to the reinforcing member, and the fixing tool and the reinforcing member The reinforcing bars are constrained between them.

  Here, the reinforced concrete structure in the present invention may be manufactured on site or may be a precast product manufactured in a factory.

  According to these inventions, since the joining force by welding is obtained at least on one end side, the reinforcing bar and the reinforcing member can be fixed with a large joining force. Here, the reinforcing bar and the reinforcing member are not welded, but it is important that the fixing member is welded to the reinforcing member. That is, the fixing member can deteriorate the material of the reinforcing bar as a structural member. While avoiding, a large joining force by welding can be realized. Thereby, the rigidity of the reinforcing bar rod etc. comprised including a reinforcing bar can be improved.

Since welding in the present invention is welding between a reinforcing member that is not a structural member in a concrete structure and a fixture, strict quality control as in the case of welding reinforcing bars can be eliminated, and welding work Can be implemented easily and quickly.
In addition, reinforcing bars are often shaped to improve the fixing strength with the concrete to be placed, whereas reinforcing members are often made to have a flat surface shape. Can be good.

  In addition, unlike the case of using bolts and nuts as fixing means, the fixing tool of the present invention does not require threading or the like, so that the member cost can be reduced.

  Furthermore, when such a fixture is not used, the reinforcing bar and the reinforcing member are directly welded or joined using special hardware. The amount of work required for fixing to the member does not increase, and since the quality control is unnecessary as described above, the work time can be shortened and the work can be easily performed. Thereby, the construction period of a reinforced concrete structure can be shortened.

In the fixture of the present invention, it is preferable that the other end side of the fixture is engaged with the reinforcing member.
Or in the manufacturing method of the reinforced concrete structure of this invention, after engaging the other end side of the said fixture with the said reinforcement member, it is preferable to weld the one end side of the said fixture to the said reinforcement member.

  According to these inventions, as described above, the one end side is welded to the reinforcing member, thereby increasing the joining force and facilitating the work, while the other end side is engaged with the reinforcing member, thereby reinforcing the fixture. Attachment to the member can be further facilitated.

  In the fixture of the present invention, the fixture is formed by bending a linear member, and a welded portion welded to the reinforcing member, and a side of the reinforcing member to which the welded portion is welded. It is preferable to include an engaging portion that engages with the opposite side and a restraining portion that restrains a reinforcing bar between the welded portion and the engaging portion between the reinforcing member.

According to the present invention, the fixture can be manufactured at low cost by bending the linear member.
Furthermore, the engaging portion can be formed simply by bending the linear member into, for example, an L shape, and the engaging portion can be hooked and engaged with the end portion of the reinforcing member. And easy mounting.
In addition, about the shape of a restraint part, V shape, U shape, etc. may be sufficient, for example.

  In the fixture according to the present invention, it is preferable that the engaging portion has a substantially U shape sandwiching an end portion of the reinforcing member.

  According to the present invention, since the engagement is stabilized by hooking the U-shaped engaging portion on the end portion of the reinforcing member, the welding operation can be easily performed, and the reinforcing member and the reinforcing bar are interposed between the fixing member and the reinforcing member. Fixing strength can be increased.

  The reinforced concrete structure of the present invention is characterized by including the above-described fixture.

  According to this invention, since the above-described fixture is provided, the same operations and effects as described above can be enjoyed.

  In the reinforced concrete structure according to the present invention, the reinforcing member is formed in an annular shape from a steel strip, and the both ends of the fixing tool are reinforced at the both ends of the steel strip fixed to portions where the both ends of the steel strip overlap each other. A fixing member welded to a member is used, and the reinforcing bar fixed to the other part of the reinforcing member is fixed so that one end side of the fixing member is welded to the reinforcing member and the other end side engages with the reinforcing member. It is preferable to use a tool.

When the reinforcing member is formed in an annular shape from the steel strip, there is a difference in thickness between a portion where both ends of the steel strip are overlapped and another portion.
According to this invention, since the number of welded portions is reduced by using the fixture that engages with one end side in the non-overlapping portion, the fixing operation can be further facilitated. In the overlapped portion, it is possible to eliminate the need to separately manufacture a fixture according to the thickness of the overlapped portion by using a fixture that is welded at both ends. Thereby, all the reinforcing bars provided in the reinforcing member can be fixed by the fixture of the present invention, and effects such as cost reduction and construction period reduction can be increased.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. Note that, for the description of the second and subsequent embodiments, the same reference numerals are given to the same configurations as those of the first embodiment, and the description will be omitted or simplified.

In this embodiment, an in-situ (in-place) reinforced concrete pile is exemplified as the reinforced concrete structure.
FIG. 1 shows a pile 1 in the present embodiment. FIG. 1A is a side view of the pile 1, and FIG. 1B is a cross-sectional view of the pile 1 taken along the line BB in FIG. 1A.
The pile 1 includes a reinforcing bar 10 having main bars 11 and spiral bars 12 as reinforcing bars as structural members, and a concrete portion 20 provided on the reinforcing bar 10.
The main reinforcing bars 11 are a plurality of steel bars, and are arranged along the circumferential direction of the pile 1 as shown in FIG.
The spiral muscles 12 are provided on the outer peripheral side of these principal muscles 11 and are fixed to the principal muscles 11 by a binding wire (not shown). In the present embodiment, the spiral muscle 12 is employed, but there is no problem even if a hoop muscle is employed instead of the spiral muscle 12.

Here, on the inner peripheral side of the reinforcing bar 10, annular reinforcing rings 15 for securing rigidity at the time of construction of the reinforcing bar 10 are provided at a plurality of locations. The reinforcing ring 15 is formed by overlapping both ends of the steel strip and joining them together by welding or the like. Although not shown in FIG. 1, the reinforcing ring 15 has an overlapping portion 151 (FIG. 2).
FIG. 2 shows a portion where the reinforcing ring 15 and the main reinforcement 11 are substantially orthogonal to each other. In FIG. 2, illustration of the spiral reinforcement 12 and the concrete portion 20 shown in FIG. 1 is omitted. Each main muscle 11 is fixed to the reinforcing ring 15 by the fixing tool 30 or the fixing tool 40.

3 and 4 show the fixtures 30 and 40 used in the present embodiment, respectively.
3 has a substantially straight welded part 31, a U-shaped restraining part 32, and an engaging part 33 that bends in an L shape from the end of the restraining part 32 by bending the wire. It is formed in preparation.
The fixture 30 is formed by welding the welded portion 31 to the outer peripheral surface portion 154 of the reinforcing ring 15 and engaging the engaging portion 33 with the inner peripheral surface portion 153 (FIG. 2) of the reinforcing ring 15. Is attached.
Note that the welded portion 31 obliquely intersects the main reinforcement 11 while being attached to the reinforcement ring 15, and the restraint portion 32 is substantially the same as the side portion 152 along the circumferential direction of the reinforcement ring 15. Along the perimeter of The engaging portion 33 is bent at a substantially right angle from the side surface portion 152 of the reinforcing ring 15 along the inner peripheral surface portion 153 (FIG. 2) of the reinforcing ring 15.

  As shown in FIG. 2, such a fixing tool 30 is provided on each of the main bars 11 arranged in a portion other than the overlapping portion 151 of the reinforcing ring 15.

On the other hand, the overlapping part 151 of the reinforcing ring 15 is provided with the fixture 40 of FIG. In addition, not only this embodiment but this fixture 40 may be provided other than the overlap part 151. FIG.
The fixture 40 includes a restraining portion 32 formed in a U-shape by bending a wire, and substantially straight welded portions 31 and 31 on both ends of the restraining portion 32, and is formed symmetrically. The welded portions 31, 31 are welded to the outer peripheral surface portion 154 of the reinforcing ring 15.
In a state of being attached to the reinforcing ring 15, the welded portions 31 and 31 of the fixture 40 are substantially parallel to the circumferential direction of the reinforcing ring 15.

When manufacturing the reinforced concrete pile 1 having the above configuration, the main bar 11 and the spiral bar 12 are bound at the factory or construction site to form the reinforcing bar 10 (FIG. 1), and the reinforcing bar 15 is provided with the reinforcing ring 15. Install. That is, the main bars 11 are fixed to the reinforcing ring 15 by using the fixing tools 30 and 40 described above.
In the present embodiment, the reinforcing ring 15 is attached in a state where the reinforcing bar 10 is tilted sideways at the site. Specifically, the reinforcing ring 15 is disposed at an appropriate attachment position with respect to the main bar 11, and the restraining portion 32 of the fixing tool 30 (FIG. 3) is used as the outer periphery of the main bar 11 at a portion where the reinforcing ring 15 and the main bar 11 intersect. The engaging portion 33 is hung on the inner peripheral surface portion 153 (FIG. 2) of the reinforcing ring 15.

Then, the main bar 11 is fixed to the reinforcing ring 15 by welding the welded portion 31 of the fixture 30 to the outer peripheral surface portion 154 of the reinforcing ring 15. Here, since the restraint portion 32 is appropriately contracted by welding of the welded portion 31, the main bar 11 is firmly restrained between the restraint portion 32 and the reinforcing ring 15. In addition, the engaging part 33 may engage with the reinforcing ring 15 along the axial direction of the main bar 11, and the positions of the main bar 11 and the reinforcing ring 15 do not shift.
In addition, after engaging the fixing tool 30 with each of the main bars 11, these fixing tools 30 may be welded to the reinforcing ring 15 at a time.

Although it may be before and after the attachment of the fixing tool 30, the fixing tool 40 (FIG. 4) is used for the main muscle 11 fixed to the overlapping portion 151 (FIG. 2) of the reinforcing ring 15. That is, the restraint portion 32 of the fixture 40 is provided on the outer periphery of the main reinforcing bar 11, and the welded portions 31 and 31 are welded to the outer peripheral surface portion 154 of the reinforcing ring 15, respectively. Also at this time, the restraint portion 32 is appropriately contracted by the welding of the welded portions 31, 31, and the main bar 11 is firmly restrained.
In the present embodiment, only one fixing device 40 is provided in the overlapping portion 151, but a plurality of fixing devices 40 are used for the reinforcing ring 15 depending on the size of the overlapping portion 151 and the arrangement of the main bars 11. Also good.

When all the main bars 11 are fixed to the reinforcing ring 15 in this way, the reinforcing bar rod 10 (FIG. 1) is installed in the excavation hole on the site. Here, the main bars 11 are securely fixed to the reinforcing ring 15 by the fixing tools 30 and 40 with a large joining force, so that the reinforcing bar 10 is not twisted and the rigidity of the reinforcing bar 10 is ensured. .
Furthermore, the pile 1 is manufactured by installing a mold (not shown) around the reinforcing bar 10 inside the excavation hole and placing concrete in the mold.

According to the above embodiment, the following effects can be obtained.
(1) In the fixtures 30 and 40 used for the reinforced concrete pile 1, since the joining force by welding is obtained at least at one end side, the main reinforcement 11 and the reinforcing ring 15 can be fixed with a large joining force. Thereby, while avoiding deterioration of the material of the main reinforcement 11 which is a structural member, the big joining force by welding can be implement | achieved and the rigidity of the reinforcing bar rod 10 comprised including the main reinforcement 11 can be improved.

  Here, by welding the reinforcing ring 15 which is not a structural member in the pile 1 and the fixtures 30 and 40, strict quality control as in the case of welding the main reinforcement 11 and the spiral reinforcement 12 can be eliminated. Makes it possible to carry out welding work easily and quickly.

  Further, since the fixtures 30 and 40 do not include bolts and nuts as fixing means, the member cost can be reduced.

  Furthermore, when such fixtures 30 and 40 are not used, the main bar 11 and the reinforcing ring 15 are directly welded or joined using special hardware, but compared with such a case. Thus, the amount of work required for fixing the main bar 11 and the reinforcing ring 15 does not increase, and quality control is unnecessary as described above, so that the work time can be shortened and the work can be easily performed. Thereby, the construction period of the pile 1 can be shortened.

(2) As for the fixture 30, as described above, the welded portion 31 is welded to the reinforcing ring 15 to increase the joining force and facilitate the work. Since it is the structure engaged with 15, attachment to the reinforcement ring 15 can be made still easier.

(3) Since the reinforcing ring 15 is made of band steel, the welded portions 31 of the fixtures 30 and 40 can be favorably welded to the surface portion of the reinforcing ring 15 without spot welding.

(4) Since the fixing members 30 and 40 can be manufactured at low cost by bending the linear member, the engaging portion 33 can be formed simply by bending the linear member into the L shape with respect to the fixing member 30. In addition, the member cost can be reduced and the attachment can be facilitated.

(5) Since the reinforcing ring 15 is formed in an annular shape from the steel strip, there is a difference in thickness between the overlap portion 151 and the other portions. The fixing portion 15 is used in the overlap portion 151 and other portions. The tools 30 and 40 are properly used.
That is, since the fixing tool 30 is used for the main reinforcement 11 fixed to the portion other than the overlapping portion 151 of the reinforcing ring 15, the number of welded portions is reduced, and the work of fixing the main reinforcing element 11 to the reinforcing ring 15 can be further facilitated. . And since the fixing tool 40 is used for the main reinforcement 11 fixed to the overlapping part 151 of the reinforcement ring 15, the distance between the to-be-welded part 31 and the engaging part 33 is set according to the thickness of the overlapping part 151. Thus, it is not necessary to manufacture the fixture 30 separately. As a result, all the main bars 11 can be fixed by the fixtures 30 and 40, so that the effects of cost reduction and shortening of the construction period can be increased.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In this embodiment, another fixture that can replace the fixture 30 (FIG. 3) used in the first embodiment will be described.
FIG. 5 shows the fixture 50 of the present embodiment. The fixture 50 may be used in appropriate combination with the fixture 30 (FIG. 3) and the fixture 40 (FIG. 4).

The fixture 50 is formed to include a welded portion 31, a restraining portion 32, and an engaging portion 35 by bending a linear member.
The welded portion 31 and the restraint portion 32 are formed in the same manner as in the case of the above-described fixture 40 (FIG. 4), but at the end of the restraint portion 32, the outer peripheral surface portion 154 and the side surface portion 152 of the reinforcing ring 15. , And a U-shaped engaging portion 35 extending continuously over the inner peripheral surface portion (FIG. 2).

The fixing device 50 is attached to the reinforcing ring 15 in substantially the same manner as the fixing device 30 (FIG. 3). However, when the engaging portion 35 is hung on the end of the reinforcing ring 15, the engaging portion 35 is attached. Can be engaged stably, so that the welding work of the welded portion 31 can be facilitated.
Moreover, since the edge part of the reinforcement ring 15 is clamped by the engaging part 35, the fixing strength of the reinforcement ring 15 and the main reinforcement 11 via this fixing tool 50 can be made high.

[Modification of the present invention]
The present invention is not limited to the embodiments described above.
For example, in each of the above embodiments, the pile 1 having a circular cross section is shown as an example of the concrete structure. However, the present invention is not limited to this, and for example, a square cross section may be used. Good. Since the reinforcing bar is appropriately determined according to the shape of the concrete structure, the annular reinforcing ring 15 is not always used.

That is, the shape of the reinforcing member is not limited, and the reinforcing ring 15 of each of the above embodiments uses a plate-shaped steel strip that can correspond to various diameters. The reinforcing member may be a reinforcing member having a circular shape or a deformed shape having a rib or the like. For example, the reinforcing member can be attached by appropriately setting the distance between the welded portion 31 and the engaging portion 33 of the fixture 30.
When the reinforcing member is formed so that there is no seam such as the overlapping portion 151, the fixing tool 30 (or the fixing tool 50) having the same configuration can be used for all the main bars fixed to the reinforcing member.

Further, with respect to the fixture, the specific shape and dimensions of the welded portion, the restraint portion, the engagement portion, etc. may be determined as appropriate according to the shape of the reinforcing member and the reinforcing bar.
The shape of the restraint portion is U-shaped in each of the embodiments described above, but is not limited thereto, and may be formed in a mountain shape, for example.
In addition, the fixtures 30, 40, and 50 illustrated in the above embodiments are all welded to the outer peripheral surface portion 154 of the reinforcing ring 15, but are fixed to be welded to the inner peripheral surface portion 153 of the reinforcing ring 15. It is also possible to consider forming a tool.

Although the best configuration for carrying out the present invention has been specifically described above, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications and improvements can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
The description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which removes a part or all of the limitation is included in the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for fixing a reinforcing bar as a structural member and a reinforcing member thereof in all reinforced concrete structures.

The side part and cross-sectional view of the reinforced concrete pile 1 in 1st Embodiment of this invention. The perspective view which shows the cross | intersection part of the reinforcement ring and main muscle in the said embodiment. The perspective view of the fixing tool which fixes the reinforcement ring and main reinforcement in the said embodiment. The perspective view of the fixing tool used for the overlap part of the reinforcement ring in the said embodiment. The perspective view of the fixing tool in 2nd Embodiment of this invention.

Explanation of symbols

1 Reinforced concrete pile (Reinforced concrete structure)
11 Main bars (steel bars)
15 Reinforcement ring (reinforcement member)
30 fixing tool 40 fixing tool 50 fixing tool 31 welded part 32 restraining part 33 engaging part 35 engaging part 151 overlapping part 152 side face part 153 inner peripheral face part 154 outer peripheral face part

Claims (8)

A restraining portion that restrains the reinforcing bar between the reinforcing member and the reinforcing member provided to intersect the reinforcing bar;
A fixing tool used for a reinforced concrete structure, wherein the reinforcing member is fixed to the reinforcing member by welding at least one end side to the reinforcing member. The fixture according to claim 1,
The other end side engages with the reinforcing member. A fixing tool used for a reinforced concrete structure. The fixture according to claim 2,
The fixture is formed by bending a linear member,
A welded portion welded to the reinforcing member;
An engaging portion that engages with the opposite side of the side to which the welded portion of the reinforcing member is welded;
A fixture used for a reinforced concrete structure, comprising: a restraining portion that restrains a reinforcing bar between the welded portion and the engaging portion between the reinforcing member and the reinforcing member. The fixture according to claim 3,
The engaging portion is formed in a substantially U shape sandwiching an end portion of the reinforcing member. A fixing tool used for a reinforced concrete structure. A reinforced concrete structure comprising the fixture according to any one of claims 1 to 4. In the reinforced concrete structure according to claim 5,
The reinforcing member is formed in an annular shape from a steel strip,
For the rebar that is fixed to the portion where both ends of the steel strip are overlapped with each other, a fixing tool in which both end sides of the fixing tool are welded to the reinforcing member is used,
The reinforcing bar fixed to the other part of the reinforcing member uses a fixing member in which one end side of the fixing member is welded to the reinforcing member and the other end side engages with the reinforcing member. body. Reinforced concrete characterized by welding at least one end side of a fixing member for fixing a reinforcing bar to a reinforcing member provided so as to cross the reinforcing bar, and restraining the reinforcing bar between the fixing member and the reinforcing member. Manufacturing method of structure. In the manufacturing method of the reinforced concrete structure of Claim 7,
After engaging the other end side of the fixture with the reinforcing member,
One end side of the fixture is welded to the reinforcing member. A method for producing a reinforced concrete structure, wherein:

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