JP4980952B2 - Shear reinforcement member and its construction method - Google Patents

Description

  The present invention relates to a shear reinforcing member used for a structure having an axial direction such as a reinforced concrete structure and a construction method thereof.

Conventionally, a shear reinforcement steel bar (hoop bar) is used for a reinforced concrete structure (for example, refer to patent documents 1). Here, when the structure has a relatively large cross section such as a chimney, the reinforcing bars used for the structure do not fit in the platform of the transport vehicle. Shear reinforcement reinforcing bars are formed by bringing them into the site and connecting the ends of the reinforcing bars at the site.
With respect to the shear reinforcing steel bars used in the large cross-section structure as described in Patent Document 1, the structure in which the steel bars are divided and connected as described above has the following problems, for example.
(1) In the case of assembling the ends of the divided shear reinforcing reinforcing bars, the reinforcing bar material is additionally required for the overlapping dimension of the reinforcing bar ends necessary for the assembly, which is uneconomical.
(2) Since the divided reinforcing bars must be assembled on site, the number of man-hours increases and construction costs increase, which is uneconomical.
(3) Since the shear reinforcing steel bars are divided, the number of on-site construction points increases. That is, since the number of quality control points on site increases, it becomes difficult to ensure the stability of construction quality.
(4) When dividing and joining rebars on site, it is difficult to ensure the processing accuracy.
Then, in order to reduce the inconvenience which connects the reinforcing bars as described in this patent document 1, the method of constructing while rewinding the steel material wound up in the coil shape is also known (for example, refer patent documents 2 and 3). ).

JP 2000-192455 A JP-A 63-134629 JP-A-8-326215

  In particular, in a configuration in which a steel rod wound in a coil shape with a reduced diameter as described in Patent Document 3 is continuously sent out and restored to the original coil diameter, an apparatus for rewinding is required. When constructing along the peripheral surface of a structure to reinforce an existing structure, there is a disadvantage that a sufficient space for unwinding and construction is required and there is a limitation in use.

  An object of this invention is to provide the shear reinforcement member which can be handled easily and can improve workability, and its construction method in view of the above point.

The first shear reinforcement member of the present invention is a shear reinforcement member constructed in a circular ring shape along the circumferential direction of a structure having an axial direction, and is constructed when constructed along the circumferential direction of the structure. In a state where the ring diameter is restored to a state where the diameter is less than ½ of the diameter when the structure is constructed along the circumferential direction and the diameter is reduced within the elastic deformation range in the winding direction. A constraining member that is reduced in diameter and restricts restoration from the reduced state and is removed at the time of construction is provided, the constraining member is formed in a container shape, and an opening from which one end of the shear reinforcing bar is pulled out on the side surface A portion is formed .
According to the present invention, the shear reinforcement member formed into the ring diameter size when being constructed along the circumferential direction of the structure according to the size of the structure is wound in a state of restoring the original ring diameter size. Since the diameter is reduced by elastically deforming in the tightening direction, even a shear reinforcement member used for a structure having a large cross section can be placed on a loading platform of a transport vehicle. Since the shear reinforcement member is reduced in diameter within the elastic range, it can be restored to the ring diameter corresponding to the size of the structure simply by releasing the restraint state that maintains the state of elastic deformation during construction on site. It becomes possible.
That is, according to the present invention, even a shear reinforcement member used for a structure having a large cross section can reduce the storage space and the packing shape, and divide the shear reinforcement member into a plurality in the circumferential direction. Is no longer necessary. Since the shear reinforcement member is integrally formed in this way, it is not necessary to connect the end portions of the members in an overlapped state at the site, so that the construction can be simplified and the material of the shear reinforcement member can be used. You can save. Further, since the shear reinforcement member is integrally formed without being divided, the number of construction points on site is reduced, and thus it becomes easy to ensure the stability of construction quality. Furthermore, since the division of the shear reinforcement member becomes unnecessary, it is only necessary to restore the shear reinforcement member to its original size on site. In other words, since it is possible to carry out processing such as forming and reducing the diameter of the shear reinforcement member at the factory, it is possible to ensure processing accuracy, and it is only necessary to release the restrained state at the site. It is only necessary to install it and the workability is improved.

The second shear reinforcement member of the present invention is a shear reinforcement member constructed in a circular spiral along the circumferential direction of a structure having an axial direction, and is constructed when constructed along the circumferential direction of the structure. In a state where the diameter is restored to the pitch dimension, the diameter is ½ or less of the diameter dimension when constructed along the circumferential direction of the structure, and the diameter is reduced within the elastic deformation range. A constraining member is provided that is reduced in diameter in the winding direction and the helical axis direction and is restricted during restoration and removed during construction, and the constraining member is formed in a container shape, and the shear reinforcement is formed on a side surface thereof. An opening from which one end of the reinforcing bar is drawn is formed .
According to the present invention, the shear reinforcement member formed in the spiral diameter dimension and the spiral pitch dimension when being constructed along the circumferential direction of the structure according to the size of the structure is the original spiral diameter dimension. In addition, since it is elastically deformed and reduced in diameter in the winding direction and the helical axis direction in a state where it is restored to the helical pitch dimension, even a shear reinforcement member used for a structure with a large cross section can be used as a loading platform of a transport vehicle. It can be placed. Since the shear reinforcement member is reduced in diameter within the elastic range, the helical diameter and the helical pitch dimension corresponding to the size of the structure can be reduced simply by releasing the restraint state that maintains the state of elastic deformation during construction on site. It can be restored.
That is, according to the present invention, even a shear reinforcement member used for a structure having a large cross section can reduce the storage space and the packing shape, and divide the shear reinforcement member into a plurality in the circumferential direction. Is no longer necessary. Since the shear reinforcement member is integrally formed in this way, it is not necessary to connect the end portions of the members in an overlapped state at the site, so that the construction can be simplified and the material of the shear reinforcement member can be used. You can save. Moreover, since the connection location of a shear reinforcement member reduces, it becomes easy to ensure the stability of construction quality. Furthermore, since the division of the shear reinforcement member is unnecessary or reduced, it is only necessary to restore the shear reinforcement member to its original size in the field. In other words, since it is possible to carry out processing such as forming and reducing the diameter of the shear reinforcement member at the factory, it is possible to ensure processing accuracy, and it is only necessary to release the restrained state at the site. It is only necessary to install it and the workability is improved.

In the present invention, it constructed and which is reduced in diameter in a state of reduced diameter and within the elastic deformation range in diameter of 1/2 or less of the diameter as it is construction along the circumferential direction of the structure.
In this invention, since the shear reinforcement member is reduced in diameter within the elastic deformation range with a diameter of ½ or less of the diameter dimension when the shear reinforcement member is constructed along the circumferential direction of the structure, the diameter dimension at the time of construction is Even if it is relatively large, it is possible to reduce the storage space and the packing form, simplify the construction, save the material of the shear reinforcement member, facilitate the stability of the construction quality, and ensure the processing accuracy. Can be realized reliably.

Further, in the present invention, and a configuration in which restraining member is removed during regulates the recovery from reduced diameter state construction are provided.
According to the present invention, by providing the restraining member, the reduced diameter state can be easily maintained with a simple configuration, and the elastic deformation can be easily released.

Furthermore, in this invention, it is preferable to set it as the structure used for reinforcement of the said existing structure.
According to the present invention, it can be easily constructed even in a place where the work area of the construction site is relatively small to reinforce an existing structure.

The construction method of the shear reinforcement member of the present invention is the construction method of the first shear reinforcement member having the above-described configuration, and is restored to the ring diameter size when constructed along the circumferential direction of the structure. A diameter reducing step in which the shear reinforcing member is elastically deformed in the winding direction to reduce the diameter, and a restraining member for restricting restoration from the reduced diameter state is provided, and the shear reinforcing member reduced in the diameter reducing step The construction process of removing the restraining member after the transport to the position where the structure is constructed, releasing the elastic deformation to restore the ring diameter dimension, and constructing in a circular ring shape along the circumferential direction of the structure; It is characterized by implementing.
According to this invention, in the diameter reduction process, elastically deformed to a state restored to the ring diameter size when being constructed along the circumferential direction of the structure, the diameter is reduced and the reduced diameter state is held by the restraining member, In this state, after transporting to the position where the structure is constructed, the area along the infarct is removed and restored, so that it is not necessary to divide the shear reinforcement member into multiple parts in the circumferential direction. Reduction, simplification of construction, material saving of the shear reinforcement member, ease of ensuring the stability of construction quality, and ensuring of processing accuracy can all be realized.

The construction method of the shear reinforcement member of the present invention is the second shear reinforcement member having the above-described configuration, and is restored to the helical dimension and the pitch dimension when constructed along the circumferential direction of the structure. In the state, the shear reinforcement member is elastically deformed in the winding direction and the helical axis direction to reduce the diameter, and a diameter reducing step is provided for restricting the restoration from the reduced diameter state, and the diameter reduction in the diameter reducing step After the transported shear reinforcing member is transported to the position where the structure is constructed, the restraining member is removed to release the elastic deformation to restore the ring diameter, and in a circular spiral along the circumferential direction of the structure. And a construction process for construction.
According to the present invention, the diameter of the spiral is reduced to the state of being restored to the helical pitch dimension and the helical diameter dimension when being constructed along the circumferential direction of the structure in the diameter reduction step, and the diameter is reduced by the restraining member. The state is maintained, and after the transportation to the position where the structure is built in this state, the area along the infarct is removed and restored, so it is unnecessary to divide the shear reinforcement member into multiple parts in the circumferential direction or reduce the number of divisions Therefore, it is possible to reduce the area during storage and transportation, simplify the construction, save the material of the shear reinforcement member, facilitate the securing of the stability of the construction quality, and secure the processing accuracy.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, about the structure similar to the structure already demonstrated, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

[First Embodiment]
FIG. 1 shows a plurality of shear reinforcing bars 2 provided in a reinforced concrete structure 1 according to this embodiment. The structure 1 is a large-scale cylindrical structure such as a chimney of a thermal power plant or a cooling tower of a geothermal power plant, and the shear reinforcing bar 2 provided along the circumferential direction of the structure 1 includes a structure Corresponding to one large cross section, it has a large diameter of, for example, about 5 to 6 m.

FIG. 2 is a plan view of the shear reinforcing bar 2. The shear reinforcing bar 2 is formed from a high-strength steel rod into a large-diameter circle as shown by a two-dot chain line in FIG. 2, but once formed into a large diameter in this way, once shown in FIG. As shown, the diameter is reduced by being elastically deformed in the winding direction. FIG. 3 shows a perspective view of the shear reinforcing steel bar 2 in a reduced diameter state.
In the present embodiment, the diameter φ ₁ (FIG. 2), which is a ring diameter when the construction is performed along the circumferential direction of the structure 1 of the shear reinforcing bar 2 before the diameter reduction, is 5 to 6 m. The diameter φ ₂ (FIG. 2) of the shear reinforcing steel bar 2 after the diameter reduction is 2.0 to 2.5 m. That is, the shear reinforcing steel bar 2 is set to have such a high strength that the diameter can be reduced within the elastic range to a diameter of ½ or less at the time of molding.

  FIG. 4 shows a state in which the shear reinforcing bar 2 is constrained in a reduced diameter state by a plurality of binding bands 3 as restraining members. The binding band 3 is provided at a plurality of locations in the circumferential direction of the shear reinforcing bar 2, and thereby the restoration of the shear reinforcing bar 2 from the reduced diameter state is regulated.

The shear reinforcing bar 2 of the present embodiment is subjected to a forming process, a diameter reducing process, and a restraining process that are carried out in a factory, respectively, and a construction process that is carried from a factory to a site by a vehicle as a transportation means is performed. The
First, a shear reinforcing bar 2 is formed from a steel rod into a circular shape having a diameter φ ₁ (FIG. 2) (forming step), and then, for example, an apparatus having drums 41 to 45 as a plurality of rotating bodies as shown in FIG. It is used to reduce the diameter of the shear reinforcing steel bar 2 (diameter reduction process). Here, one end portion of the shear reinforcing bar 2 is fixed by a fixing means 46, and each drum 41 to 44 can be moved by a driving device (not shown) from the radially outer side to the inner side of the shear reinforcing bar 2. . As a result, the shear reinforcing bar 2 is elastically deformed in the winding direction along the outer peripheral portion of the drum 45 and is reduced in diameter to φ ₂ (FIG. 2). The reduced diameter shear reinforcing steel bar 2 is restrained by a binding band 3 (FIG. 4) (restraining step).

Next, the restrained shear reinforcing bar 2 (FIG. 4) is loaded on the loading platform of the vehicle. Here, the shear reinforcing rebar 2 is reduced in diameter as shown in FIG. 2, by the reduced diameter diameter phi ₂ is equal to or less than the width of the cargo bed of the vehicle, without dividing processing shear reinforcement rebar 2, the vehicle It can be loaded on the carrier and transported from the factory to the site (transportation process). Note that a plurality of shear reinforcing bars 2 may be stacked in the height direction H (FIG. 4) on the loading platform of the vehicle.

Then, by removing the site with binding band from the shear reinforcement rebar 2 3 (4), to restore the shear reinforcement rebar 2 to the size of the diameter phi ₁ (restore process). The restored shear-reinforced steel reinforcing bar 2 is fixed around a reinforcing bar 11 erected along the axial direction of the structure 1, and concrete 12 is placed, whereby the reinforced concrete structure 1 is completed.

  According to the above embodiment, the following effects can be obtained.

(1) Even the shear reinforcing bar 2 used in the structure 1 having a large cross section is reduced in diameter to a size that can be transported, so that it is not necessary to divide the shear reinforcing bar 2 into a plurality of parts. By forming the shear reinforcing bar 2 integrally as described above, it is not necessary to connect the end portions of the members in an overlapped state at the site, and only the release operation in a restrained state is necessary at the site, and the restoration is performed. It is sufficient to simply install the shear reinforcement member, and the construction can be simplified and the material of the shear reinforcement bar 2 can be saved. Moreover, since the number of construction points at the site is reduced by forming the shear reinforcing reinforcement 2 integrally without being divided, it is easy to ensure the stability of construction quality. Furthermore, since processing such as forming and reducing the diameter of the shear reinforcing steel bars 2 is performed at the factory, processing accuracy can be ensured.

(2) Shear reinforcement rebar 2 is reduced in diameter in the diameter a and the elastic deformation range in diameter phi ₁ of 1/2 or less of the time, which is construction in the circumferential direction of the building. For this reason, the shear reinforcing bar 2 can be used in a ring shape without being divided up to a large diameter φ ₁ at the time of construction that can be transported by the vehicle. That is, the large diameter of the construction when the diameter phi ₁ of the shear reinforcement rebar 2 available for ring obtained. Therefore, the simplification of construction, the material saving of the shear reinforcement member, the ease of ensuring the stability of the construction quality, and the securing of the processing accuracy can all be realized more reliably.

(3) The shear reinforcing bar 2 is maintained in a reduced diameter state using the binding band 3. For this reason, the diameter-reduced state can be easily maintained with a simple configuration, and the elastic deformation can be easily released.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view of the shear reinforcing bar 5 of the present embodiment. The shear reinforcing bar 5 is formed in a spiral shape (spiral shape) in a plan view from a high-strength steel rod, and when arranged in a structure (not shown), it is wound a plurality of times in the circumferential direction of the structure. It is formed in length. This shear reinforcing steel bar 5 is formed in a diameter corresponding to the diameter of the structure.

FIG. 7 shows a state in which the shear reinforcing bar 5 of FIG. 6 is reduced in diameter by elastic deformation in the helical axis direction with a diameter of 1/2 or less of the helical diameter when the structure 1 is constructed along the circumferential direction of the structure 1. Indicates. The shear reinforcing bar 5 is also reduced in diameter in the winding direction and further in the helical axis direction within an elastic range by an apparatus as shown in FIG.
Similarly to the shear reinforcing bar 2 of the first embodiment, the shear reinforcing bar 5 of the present embodiment is loaded on the loading platform of the vehicle, transported from the factory to the site, and restored to the original diameter (state of FIG. 6) on the site. .

According to this embodiment, the same effect as the first embodiment can be obtained.
In addition, since the shear reinforcing bar 5 of the present embodiment is integrally formed in several steps spirally, compared to the case where the shear reinforcing bar 2 is formed step by step as in the first embodiment, the shear reinforcing bar 5 is formed. The work of reducing the diameter of a reinforcing bar, the work of constraining a shear reinforcing steel bar to a reduced diameter state, the work of carrying and carrying it to the site, and the work of arranging it on a structure can be made more efficient.

[Modification of the present invention]
The present invention is not limited to the above embodiment.
FIG. 8 shows the restraining member 6 that restricts the restoration of the shear-reinforced steel reinforcing bar 2 in the reduced diameter state. The restraint member 6 is formed in a container shape such as a square in plan view or a circle in plan view, and an opening 61 from which one end of the shear reinforcing bar 2 is drawn is formed on the side surface of the restraint member 6. By gradually pulling out and restoring the shear reinforcing bar 2 from the opening 61, the work can be made easier than when the entire shear reinforcing bar 2 is restored at once.

Moreover, although the shear reinforcement member illustrated above was formed from a steel rod having a circular cross section, the present invention is not limited thereto, and the shear reinforcement member may be formed from a steel strip or the like.
Furthermore, the structure in which the shear reinforcing member of the present invention is used is not limited to a reinforced concrete structure but may be a rock or the like. Furthermore, the shear reinforcing member of the present invention may be used not only for manufacturing a reinforced concrete structure but also for reinforcing an existing structure. In this case, it is fixed in a state where the shear reinforcing bar is wound around the outer peripheral portion of the existing structure.

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.

1 is a schematic perspective view of a structure according to a first embodiment of the present invention. The top view of the shear reinforcement bar used for the structure of the embodiment. The perspective view which shows the state by which the said shear reinforcement reinforcing bar was diameter-reduced. The figure which shows the state by which the said shear reinforcement bar was restrained. The figure which shows the apparatus which diameter-reduces the said shear reinforcement bar. The perspective view of the shear reinforcement bar which concerns on 2nd Embodiment of this invention. The perspective view which shows the state by which the shear reinforcement bar of FIG. 6 was diameter-reduced. The figure which shows the restraint member which restrains the shear reinforcement bar of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Structure 2 Shear reinforcement reinforcement 3 Binding band 5 Shear reinforcement reinforcement 6 Restraint member 11 Reinforcement 12 Concrete 61 Opening diameter ₁ Diameter (diameter at the time of molding and restoration)
φ ₂ diameter (reduced diameter)

Claims (5)

A shear reinforcement member constructed in a circular ring shape along the circumferential direction of a structure having an axial direction,
In a state restored to the ring diameter dimension when constructed along the circumferential direction of the structure, the diameter is less than ½ of the diameter dimension when constructed along the circumferential direction of the structure and is elastic. The diameter is reduced in the winding direction to a state of reducing the diameter within the deformation range ,
A restraint member that regulates restoration from the reduced diameter state and is removed during construction is provided.
The said restraining member is formed in a container shape, The opening part from which the one end part of the said shear reinforcement bar is pulled out is formed in the side surface, The shear reinforcement member characterized by the above-mentioned. A shear reinforcement member constructed in a circular spiral along the circumferential direction of a structure having an axial direction,
Less than 1/2 of the radial dimension when constructed along the circumferential direction of the structure in a state restored to the helical dimension and the pitch dimension when constructed along the circumferential direction of the structure The diameter is reduced in the winding direction and the helical axis direction in a state where the diameter is reduced within the elastic deformation range ,
A restraint member that regulates restoration from the reduced diameter state and is removed during construction is provided.
The said restraining member is formed in a container shape, The opening part from which the one end part of the said shear reinforcement bar is pulled out is formed in the side surface, The shear reinforcement member characterized by the above-mentioned. The shear reinforcement member according to claim 1 or 2 ,
A shear reinforcing member used for reinforcing an existing structure. A method for constructing a shear reinforcement member according to claim 1, comprising:
The shear reinforcement member is elastically deformed in the tightening direction to reduce the diameter to a state where the ring diameter is restored when being constructed along the circumferential direction of the structure, and the restoration from the reduced diameter state is regulated. A diameter-reducing step of providing a restraining member to be
After the shear reinforcement member reduced in diameter reducing step is transported to the position where the structure is constructed, the restraining member is removed to release elastic deformation to restore the ring diameter dimension, and the circumferential direction of the structure And a construction process of constructing a circular ring along the surface of the shear reinforcement member. A method for constructing a shear reinforcement member according to claim 2,
The shear reinforcement member is elastically deformed in the winding direction and the helical axis direction so as to be reduced in diameter in a state of being restored to the helical dimension and the pitch dimension when being constructed along the circumferential direction of the structure, A diameter reducing step of providing a restraining member for restricting restoration from the reduced diameter state;
After the shear reinforcement member reduced in diameter reducing step is transported to the position where the structure is constructed, the restraining member is removed to release elastic deformation to restore the ring diameter dimension, and the circumferential direction of the structure A construction method for constructing a shear reinforcement member, comprising: a construction process in which the construction is performed in a circular spiral shape along the line.

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