JP7129327B2 - Reinforcing member and method for manufacturing reinforcing member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reinforcement member for a reinforcing bar cage used in a cast-in-place pile construction method or the like, and a method for manufacturing the reinforcement member.

Conventionally, when constructing a concrete structure such as a building, reinforced concrete piles are driven deep into the ground as a foundation structure for stably supporting the structure on the ground. In the construction of reinforced concrete piles by the cast-in-place pile method, first, a vertical hole is excavated in the ground by an excavator. Then, a reinforced concrete pile is constructed by inserting a reinforcing bar assembly called a reinforcing bar cage, which is three-dimensionally assembled by crossing many reinforcing bars vertically and horizontally, into the vertical hole and then pouring concrete into the vertical hole.

Reinforcement cages embedded in reinforced concrete piles are assembled into a cylindrical shape near the construction site or in a factory, etc., transported to the construction site, erected by lifting with a crane or the like, and erected inside the excavated vertical hole. Such a reinforcing bar cage includes a large number of main reinforcing bars arranged in the direction of the central axis on the circumference and a large number of hoop reinforcing bars wound around the main reinforcing bars. are joined by iron wire binding, welding, or the like.

Furthermore, in order to increase the rigidity of the reinforcing bar cage, a reinforcing ring steel material is placed so as to contact each main reinforcing bar from the inside of the reinforcing bar cage. ing. For example, Patent Literature 1 discloses a reinforcing bar cage provided with an annular steel member (reinforcing ring) formed by overlapping both end portions of steel strips and joining them by welding or the like.

Japanese Patent Application Laid-Open No. 2008-50803

By the way, when reinforced concrete piles, which are the foundation of a huge building, are formed with a large diameter and a long length in order to stably support the building body, the size of the reinforcing bar cage embedded inside also becomes large. The overall weight becomes extremely heavy. In such cases, if the rigidity of the reinforcing bar cage is not sufficient, the reinforcing bar cage will be twisted or bent due to its own weight during the process of assembling, transporting, and setting into the excavated vertical hole. There is a risk of In particular, in the case of a large-diameter rebar cage (generally having a diameter of about 1400 mm or more), the larger the diameter, the more the rigidity of the rebar cage can be sufficiently increased with only the reinforcing ring using the band steel of Patent Document 1. Because it is difficult to secure, the reinforcing bar cage may lose its shape or, in the worst case, collapse. In addition, in a state in which a reinforced concrete pile is embedded with a reinforced concrete pile and the reinforced concrete pile supports the building body, when the building body shakes due to an earthquake or the like, the annular steel member (reinforcing ring) deforms. In the case that the pile is closed, the main reinforcement may separate from the annular steel material (reinforcing ring), and there is a risk that the rigidity of the reinforced concrete pile will be greatly reduced from the initial level.

Therefore, as a ring-shaped steel material for reinforcement in the reinforcing bar cage, a long angle material (angle steel material) with an L-shaped cross section is bent in the longitudinal direction, and a ring-shaped member (Fig. 9 (a) )) may be used. In the manufacturing process of such a ring-shaped member, in order to increase the rigidity of the reinforcing bar cage, it is required to make the angle material as close to a perfect circle as possible.

However, when the angle material is bent into a ring shape, it may be twisted, and there is a problem that it is difficult to manufacture a ring-shaped member with good roundness. In addition, since the angle material is a steel material with high bending strength, it is necessary to repeat the bending process many times in the process of processing the angle material into a ring shape to gradually bend it closer to a perfect circle. The manufacturing process of the member becomes complicated. Therefore, the manufacturing of the ring-shaped member has the problem that it takes a lot of labor and time, and the cost is also high. Moreover, when fixing the main reinforcement of a reinforcing bar cage and a ring-shaped member, there exist the following problems.

9(a) and 9(b) are diagrams showing a conventional ring-shaped member. As shown in FIGS. 9A and 9B, one flat plate portion 402 of the ring-shaped member 401 has an inner peripheral surface 402a and an outer peripheral surface 402b and has a short cylindrical shape. The other flat plate portion 403 is formed to protrude from one peripheral edge of the one flat plate portion 402 toward the center of the ring-shaped member 401 in the shape of a flange. Then, as shown in FIG. 9B, the main reinforcement 411 is arranged so as to contact the outer peripheral surface 402b of the flat plate portion 402 of the ring-shaped member 401. As shown in FIG.

Here, when welding is used as means for fixing the main reinforcement 411 and the ring-shaped member 401, the contact portion between the main reinforcement 411 and the outer peripheral surface 402b of the flat plate portion 402 of the ring-shaped member 401 is joined by welding. Become. However, it is difficult to bend the angle material into a ring shape to form a smooth flat plate portion without distortion or warp. In practice, as shown in FIG. Since the 402b is distorted or warped, gaps 405 and 406 are formed between the main reinforcement 411 and the outer peripheral surface 402b of the flat plate portion 402 .

In such a case, since a high welding technique is required, there is a problem that there is a high possibility that the welding strength and welding quality will vary depending on the skill level of the worker, and that the rigidity of the reinforcing bar cage will vary. In addition, when the contact area between the main reinforcement 411 and the outer peripheral surface 402b of the flat plate portion 402 is small and the gap is large, the welded portion is likely to corrode over time, resulting in a decrease in strength or breakage from the welded portion. There is a risk that it will become loose.

Therefore, the present invention has been made in view of the above problems, and aims to provide a ring-shaped reinforcing member that can be manufactured more easily than before and can be reliably and firmly fixed to the main reinforcement of a reinforcing bar cage. aim.

(1) The present invention is a reinforcing member for reinforcing a reinforcing bar cage having a plurality of intersecting main reinforcements and a plurality of hoop reinforcements, wherein a first long flat plate is bent in the longitudinal direction and both ends are joined together. and a flange member formed by bending the longitudinal side surface of a second long flat plate and joining both ends to form an annular shape, wherein the flange The outer peripheral edge of the member is joined to the inner peripheral surface of the ring-shaped member, and the outer peripheral surface of the ring-shaped member that contacts the main reinforcement in the width direction is smooth.

(2) In the reinforcing member of (1) above, a fixture having a pair of bolts having locking portions for locking the main reinforcing bars and a pair of nuts attachable to the pair of bolts is provided. It is preferable that the ring-shaped member has at least as many bolt insertion holes as the fasteners, through which the pair of bolts can be inserted.

(3) From another aspect, the present invention provides a method for manufacturing a reinforcing member for reinforcing a reinforcing bar cage having a plurality of intersecting main reinforcements and a plurality of hoop reinforcements, comprising: a step of bending and joining both ends to form a ring shape to form a ring-shaped member; bending the longitudinal side surface of the second long flat plate and joining both ends to form a ring shape; a step of forming a flange member; and a step of joining the outer peripheral edge of the flange member to the inner peripheral surface of the ring-shaped member.

Advantageous Effects of Invention According to the present invention, it is possible to provide a ring-shaped reinforcing member that can be manufactured more easily than before and that can be securely and firmly fixed to the main reinforcement of a reinforcing bar cage.

In addition, since the reinforcing member of the present invention can be manufactured using an inexpensive flat bar, the manufacturing cost is greatly reduced compared to the conventional reinforcing member manufactured by bending an expensive angle material into a ring shape. be able to. In addition, the flat bar has better workability than the angle material, and the time required for bending can be shortened.

In addition, in the production of conventional reinforcing members, standard products with predetermined shapes and dimensions are used for the angle materials (equal-sided angle steel, unequal-sided angle steel, unequal-sided angle steel, unequal thickness angle steel, etc.) to be bent. The shape and dimensions (thickness, width, etc.) of the reinforcing member of the present invention can be freely set in consideration of the weight, length, diameter, rigidity, etc. of the reinforcing bar cage.

In addition, when the reinforcing member of the present invention and the main reinforcement of the reinforcing bar cage are joined by welding, the joint surface of the reinforcing member has a smooth surface shape, so that the occurrence of welding defects is reduced and the welding strength is improved. And the welding quality can be improved, and the rigidity of the reinforcing bar cage can be sufficiently secured.

Therefore, by using the reinforcing member of the present invention, it is possible to greatly reduce the cost for preventing deformation such as deformation such as deformation that occurs in the process of assembling, transporting, erecting, etc. of a large-diameter reinforcing bar cage. It is possible to improve work efficiency such as basket assembly.

1 is a perspective view showing a reinforcing bar cage using reinforcing members according to a first embodiment of the present invention; FIG. FIG. 2 is a plan view showing the reinforcing bar cage of FIG. 1; BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the reinforcement member which concerns on 1st Embodiment of this invention, Comprising: (a) is a perspective view of the ring-shaped member of a reinforcement member, (b) is a perspective view of the flange member of a reinforcement member. 1. It is a figure which shows the intersection part of the reinforcement member and main reinforcement of the reinforcing bar cage of FIG. 1, (a) is a longitudinal side view, (b) is the figure which looked at the intersection part from the inside of a reinforcing bar cage. FIG. 7 is a plan view showing a reinforcing bar cage using reinforcing members according to a second embodiment of the present invention; FIG. 8 is a perspective view of a ring-shaped member of a reinforcing member according to a second embodiment of the present invention; It is a figure which shows the intersection part of the reinforcement member and main reinforcement of the reinforcing bar cage of FIG. 5, (a) is a longitudinal side view, (b) is the figure which looked at the intersection part from the inside of a reinforcing bar cage. It is a perspective view which shows the reinforcement member which concerns on this modification. (a) is a perspective view showing a conventional reinforcing member (ring-shaped member), and (b) is a longitudinal side view showing an intersection of a reinforcing member and a main bar of a reinforcing bar cage using the reinforcing member of (a). be.

Hereinafter, reinforcing members according to embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, a reinforcing bar cage 10 using a reinforcing member 100 of the present invention is formed into a cylindrical shape by combining a plurality of main reinforcements 11 and a plurality of annular hoop reinforcements 12 . The main rebars 11 are long rebars of straight deformed bar steel, and are arranged at predetermined intervals so as to form a circular shape parallel to the central axis direction of the rebar cage 10 . Moreover, the hoop reinforcement 12 is a reinforcing bar formed in an annular shape, and is provided so as to bundle the entire main reinforcement 11 from the periphery. That is, each main reinforcement 11 contacts the inner circumference of the hoop reinforcement 12 in a substantially orthogonal state. A plurality of such hoop reinforcements 12 are arranged at predetermined intervals in the longitudinal direction of the main reinforcements 11 . The portions where the main reinforcement 11 and the hoop reinforcement 12 contact are joined by welding.

In addition, the joining of the portion where the main reinforcement 11 and the hoop reinforcement 12 are in contact by welding may be performed by binding the main reinforcement 11 and the hoop reinforcement 12 with a metal wire for tightening. Further, instead of the annular hoop reinforcement 12, for example, a helically formed spiral reinforcement may be used to bundle the entire main reinforcement 11 from the periphery.

Furthermore, as shown in FIGS. 1 and 2 , ring-shaped reinforcing members 100 are provided at a plurality of locations on the inner peripheral side of the reinforcing bar cage 10 . Here, the arrangement interval between the reinforcing members 100 in the longitudinal direction of the main reinforcement 11 is wider than the arrangement interval between the hoop reinforcements 12 . The reinforcing member 100 is in contact with each main reinforcement 11 while crossing each main reinforcement 11 in a substantially orthogonal state. The portions where the reinforcing member 100 and each main reinforcement 11 contact are joined by welding so that the shape of the reinforcing bar cage 10 can be reliably maintained.

Next, the configuration of the reinforcing member 100 will be described in detail. As shown in FIG. 2, the reinforcing member 100 includes a ring-shaped member 20 that contacts the main reinforcement 11 and a flange member 30 that protrudes toward the center of the ring-shaped member 20 like a flange.

Here, as shown in FIG. 3A, the ring-shaped member 20 is formed by bending a flat bar (flat steel), which is an example of a long flat plate, in the longitudinal direction, and connecting both ends of the flat bar. It is formed in an annular shape. As shown in FIG. 3(b), the flange member 30 is formed by bending the side surfaces of a long flat bar (flat steel) in the longitudinal direction, and joining both ends of the flat bar to form an annular shape. It is molded into The inner diameter of the ring-shaped member 20 and the outer diameter of the flange member 30 are substantially the same, and the inner peripheral surface 21 of the ring-shaped member 20 and the outer peripheral edge 31 of the flange member 30 are aligned. come into contact. The reinforcing member 100 has a T-shaped cross section (see FIG. 4(a)), and the inner peripheral surface 21 of the ring-shaped member 20 and the outer peripheral edge 31 of the flange member 30 are arranged at two or more locations at predetermined intervals. It is manufactured by joining by welding along the entire circumference. Therefore, as shown in FIGS. 4A and 4B, the reinforcing member 100 has high rigidity because the flange member 30 is positioned at the center of the ring-shaped member 20 in the width direction (the axial direction of the main reinforcement 11). It is made of circular steel.

For bending the flat bar, a commercially available flat bar processing machine such as a bar bender can be used. In addition, since the flat bar is superior in workability to the angle material and is inexpensive, it is possible to reduce the manufacturing time and cost as compared with the conventional reinforcing member manufactured using the angle material. Further, the width, thickness, and diameter of the ring-shaped member 20 or the flange member 30 can be set in consideration of the weight, length, diameter, rigidity, etc. of the reinforcing bar cage 10 . That is, it is possible to freely set the shape and size of the reinforcing member 100 .

When fixing the reinforcing member 100 having such a configuration to each main reinforcing bar 11, the reinforcing member 100 is crossed with each main reinforcing bar 11 in a substantially orthogonal state while the reinforcing bar cage 10 is laid down. It is arranged so as to be in contact with the main reinforcement 11 . Then, the portions where the outer peripheral surface 22 of the ring-shaped member 20 and each main reinforcement 11 are in contact are welded. When the welding is completed, the temperature of the welded portion heated to a high temperature gradually decreases, and the welded portion shrinks due to this cooling process, so that the reinforcing member 100 and each main reinforcing bar 11 are attracted to each other with a strong force. . Therefore, the reinforcing member 100 is reliably and firmly fixed to each main reinforcement 11 with a large welding force. When the reinforcing member 100 is attached to the reinforcing bar cage 10 in this way, each main reinforcing bar 11 is strongly supported by the reinforcing member 100 having high rigidity, so that the shape stability of the reinforcing bar cage 10 is improved more than before. can be done.

Further, the outer peripheral surface 22 of the ring-shaped member 20 that crosses and contacts the main reinforcement 11 has a smooth (flat) surface shape as shown in FIG. Since the area is wider than that using conventional angle material, welding can be performed more easily than before, and variations in welding due to the skill level of workers can be suppressed. Therefore, it is easier than before to improve the welding strength and welding quality at the intersection between the main reinforcement 11 and the reinforcing member 100 without being skilled in welding, and the rigidity of the reinforcing bar cage 10 can be sufficiently secured. will be able to

(Second embodiment)
Next, a reinforcing member according to the second embodiment will be described. In the present embodiment, portions having the same lower two digits as those of the first embodiment described above are the same as those described in the first embodiment, so description and illustration thereof will be omitted unless otherwise specified. .

A reinforcing member 200 according to the second embodiment includes a ring-shaped member 220 and a flange member 230, as shown in FIG. As shown in FIGS. 5 and 6, the ring-shaped member 220 is formed by bending a long flat bar in the longitudinal direction. , and a flat bar formed into an annular shape by connecting both ends thereof.

Here, the pair of bolt insertion holes 240 are located on the inner peripheral surface 221 and the outer peripheral surface 222 of the ring-shaped member 220 at positions shifted by a predetermined distance from the central position in the width direction of the ring-shaped member 220 (positions unevenly distributed in the width direction). is provided in Two bolt insertion holes 240 are provided corresponding to each main reinforcement 211 . The reinforcing member 200 is welded to the outer peripheral edge 231 of the flange member 230 at two or more locations at predetermined intervals or over the entire circumference at a position that does not close the bolt insertion hole 240 on the inner peripheral surface 221 of the ring-shaped member 220. Manufactured in That is, as shown in FIGS. 7(a) and 7(b), the flange member 230 is located at a position slightly displaced from the center position of the ring-shaped member 220 in the width direction (for example, in FIG. 7(a), the position of the ring-shaped member 220 is (above the central position) are joined by welding, and the cross section of the reinforcing member 200 is substantially T-shaped.

In FIGS. 7A and 7B, the flange member 230 is joined at a position shifted upward from the center position in the width direction of the ring-shaped member 220, but it is not limited to this position. do not have. For example, when the bolt insertion hole 240 is provided upward from the center position in the width direction of the ring-shaped member 220, the flange member 230 is shifted downward from the center position in the width direction of the ring-shaped member 220. , may be joined by welding.

For punching the flat bar, a commercially available flat bar processing machine such as an electro-hydraulic puncher can be used. In addition, since the flat bar is superior in workability to the angle material, the bolt insertion hole 240 will not be crushed even if the bending process is performed after the drilling process. As in the first embodiment, the width, thickness, and diameter of the ring-shaped member 220 or the flange member 230 are set in consideration of the weight, length, diameter, rigidity, etc. of the reinforcing bar cage 210. can do. That is, it is possible to freely set the shape and size of the reinforcing member 200 .

When fixing the reinforcing member 200 having such a configuration to each main reinforcing bar 211, the reinforcing member 200 is crossed with each main reinforcing bar 211 in a substantially orthogonal state while the reinforcing bar cage 210 is laid down. It arrange|positions so that the main reinforcement 211 may be contacted. At this time, alignment is performed so that each main reinforcement 211 and the bolt insertion hole 240 of the ring-shaped member 220 correspond to each other. Then, as shown in FIG. 7A, a U-shaped bolt 241 is inserted through the bolt insertion hole 240 from the main reinforcement 211 side at the intersection of the main reinforcement 211 and the ring-shaped member 220, and tightened with a nut 242. The main reinforcement 211 and the ring-shaped member 220 are in a pressure contact state. Therefore, since the reinforcing member 200 is securely and firmly fixed to each main reinforcement 211, the shape of the reinforcing bar cage 210 can be reliably maintained, and the rigidity of the reinforcing bar cage 210 can be increased.

Although the embodiments of the present invention have been described above based on the drawings, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

In each of the above-described embodiments, the case where each main reinforcing bar of the reinforcing bar cage is one (single reinforcing bar) has been described, but the reinforcing member of the present invention is not limited to this. It can also be applied to a so-called bundled bar type reinforcing bar cage in which two or more bars are arranged side by side. Further, in the second embodiment, the intersections of the main reinforcing bars and the ring-shaped member may be fixed by tightening with U-shaped bolts and nuts, and then joined by welding.

In addition, in each of the above-described embodiments, the reinforcing member may be provided with a connecting plate in order to increase the rigidity of the reinforcing member. A modification of the present invention will be described below with reference to FIG. In this modified example, portions having the same last two digits as those of the above-described embodiments are the same as those described in the above-described embodiments, so description and illustration thereof will be omitted unless otherwise specified.

As shown in FIG. 8 , the reinforcing member 300 according to this modified example includes a ring-shaped member 320 , a flange member 330 and a connecting plate 350 . The connection plate 350 is a substantially right-angled triangular steel plate, and a plurality of the connection plates 350 are provided at predetermined intervals in the circumferential direction of the reinforcing member 300 . Specifically, the connecting plate 350 is arranged so as to contact the inner peripheral surface 321 of the ring-shaped member 320 and one surface 332 of the flange member 330 substantially orthogonal to the inner peripheral surface 321, and is welded. It is attached. That is, the connecting plate 350, the ring-shaped member 320, and the flange member 330 are substantially perpendicular to each other, and the rigidity of the reinforcing member 300 can be increased.

Therefore, when the reinforcing member 300 configured in this manner is attached to the reinforcing bar cage 310 by welding or non-welding metal fittings, the shape stability of the reinforcing bar cage 310 can be further improved than in the conventional art. Deformation such as deformation can be prevented. In addition, in the reinforcing member 300 of this modified example, the connecting plate 350 is provided only on one surface 332 of the flange member 330 , but may be provided on both surfaces of the flange member 330 similarly. In this case, the rigidity of reinforcing member 300 can be further increased.

Further, in the reinforcing member 300, as in the second embodiment, a plurality of pairs of bolt insertion holes may be provided, and the main reinforcement may be fixed by tightening the ∪-shaped bolt and nut.

Also, welding is used as the joining method in each of the above-described embodiments and modifications, but the method is not limited to this. For example, bonding with an adhesive or bonding by pressure bonding may be used.

Although the fixture in the second embodiment is composed of a ∪-shaped bolt and a nut, it is not limited to this, and may be of any type as long as it can fix the main reinforcement to the reinforcing member. . For example, a pair of bolts, a plate-shaped locking portion through which the pair of bolts penetrate (a portion having the same function as the folded portion of the ∪-shaped bolt), and a pair of bolts while the locking portion is in contact with the main reinforcement and a pair of nuts that can be tightened in the same manner as in the above embodiments.

10, 210, 310 Rebar cage 11, 211, 311, 411, 511 Main reinforcement 12, 212 Hoop reinforcement 20, 220, 320 Ring-shaped member 21, 221, 321, 402a Inner peripheral surface 22, 222, 322, 402b Outer peripheral surface 30 , 230, 330 flange members 31, 231, 331 outer peripheral edges 100, 200, 300 reinforcing member 240 bolt insertion hole 241 U-shaped bolt 242 nut 401 conventional ring-shaped member

Claims (3)

A reinforcing member that reinforces a reinforcing bar cage having a plurality of intersecting main reinforcements and a plurality of hoop reinforcements,
a ring-shaped member formed by bending the first long flat plate in the longitudinal direction and joining both ends to form an annular shape;
a flange member formed by bending the longitudinal side surface of the second long flat plate and joining both ends to form an annular shape;
with
The outer peripheral edge of the flange member is joined to the inner peripheral surface of the ring-shaped member,
A reinforcing member, wherein an outer peripheral surface of the ring-shaped member that abuts on the main reinforcement in the width direction is smooth. A plurality of fasteners having a pair of bolts having locking portions for locking the main reinforcement and a pair of nuts attachable to the pair of bolts,
2. The reinforcing member according to claim 1, wherein said ring-shaped member has a pair of bolt insertion holes through which said pair of bolts can be inserted, at least as many as said fasteners. A method for manufacturing a reinforcing member for reinforcing a reinforcing bar cage having a plurality of intersecting main reinforcements and a plurality of hoop reinforcements, comprising:
a step of bending the first long flat plate in the longitudinal direction, joining both ends to form a ring shape, and forming a ring-shaped member;
a step of bending the longitudinal side surface of the second elongated flat plate, joining both ends to form an annular shape, and forming a flange member;
joining the outer peripheral edge of the flange member to the inner peripheral surface of the ring-shaped member;
A method for manufacturing a reinforcing member having

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