JP6983038B2 - Reinforced concrete member - Google Patents

Description

The present invention relates to a reinforced concrete member.

There is an underground tank as a facility for storing low-temperature liquefied gas such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas). As shown in FIG. 9, in the underground tank, a tank skeleton is formed inside a continuous underground wall 107 by a disk-shaped bottom slab 111 made of reinforced concrete and a cylindrical side wall 109, and a steel roof 119 is provided on the tank skeleton.

Inside the bottom slab 111, the upper reinforcing bar 115 and the lower reinforcing bar 117 in the horizontal direction and the shear reinforcing reinforcing bar 113 in the vertical direction are embedded.

FIG. 10 is a simplified view of the uppermost reinforcing bar 115 in the uppermost stage. As shown in FIG. 10, the upper reinforcing bar 115 is composed of a grid-shaped reinforcing bar 121 at the center of the bottom slab 111, a radial reinforcing bar 123 at the outer peripheral portion of the bottom slab 111, and a circumferential reinforcing bar 125.

The circumferential reinforcing bar 125 is composed of a plurality of rings 125-1, 125-2, ..., 125-6 arranged concentrically. In the example of FIG. 10, each ring 125-1, ..., 125-6 is formed by connecting the threaded rebar with a mechanical joint 127, and each ring 125-1, ..., 125-6 has a threaded rebar at the closing portion 129. Extra length is generated. Therefore, in the closing portion 129, after performing precision cutting for length adjustment, the screw reinforcing bar is connected to the mechanical joint 127.

The upper rebar 115 and the lower rebar 117 other than the uppermost rebar have almost the same configuration as in FIG. 10, but as the circumferential rebar, a normal rebar is used instead of a screw rebar, and a lap joint is used instead of the mechanical joint 127. Often done. In this case, the extra length of the reinforcing bar is gas-cut at the closed portion of the ring, or the reinforcing bar is arranged as it is as a waste bar.

In the example shown in FIG. 10, the grid-like reinforcing bars 121 are provided at the center of the upper reinforcing bars 115, but the reinforcing bars of the entire bottom slab may be composed of radial reinforcing bars and circumferential reinforcing bars (for example, Patent Document). 1).

Japanese Unexamined Patent Publication No. 09-049344

As described above, in the conventional reinforcing bar arrangement method, extra length is generated in the reinforcing bar at the closed portion of all the rings. In recent years, the diameter and thickness of the bottom slab have increased due to the large capacity of the underground tank, and a large number of rings are arranged and a large diameter reinforcing bar is used for this, so that the amount of wasted reinforcing bars increases.

In addition, it takes time to cut the extra length of the reinforcing bar, and especially when using a mechanical joint, it is necessary to precisely cut with a disc grinder so that the closed part of each ring can be connected by the mechanical joint, so it takes more time. This is the work.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a reinforced concrete member capable of reducing the construction period and cost.

The present invention for solving the above-mentioned problems is a disk-shaped reinforced concrete member in which a circumferential reinforcing bar and a shear reinforcing reinforcing bar are embedded, and at least a part of the circumferential reinforcing bars is arranged in a spiral shape in the same plane. are, the shear reinforcing rebar is a reinforced concrete member, characterized in Rukoto spaced helically along the circumferential direction reinforcing bar.

In the present invention, by arranging the circumferential reinforcing bars in a spiral shape in the same plane, there is no closed portion when the reinforcing bars are arranged in a ring shape, so that waste of the reinforcing bars and cutting points of the reinforcing bars are minimized, and the reinforcing bars to be purchased are minimized. The amount can be reduced. In addition, the number of joints can be reduced, which leads to a reduction in construction period and cost.

It is desirable that the circumferential reinforcing bars are formed by adding a plurality of reinforcing bars, and the reinforcing bars excluding the reinforcing bars at one end of the circumferential reinforcing bars have the same length.
In the present invention, since most of the circumferential reinforcing bars use reinforcing bars of the same length, the reinforcing bars purchased in bulk at a fixed length can be used as they are without being cut.

It is desirable that the radial rebar is further embedded and the radial rebar intersects the circumferential rebar at the position of the marker formed on the radial rebar.
By forming a marker on the radial reinforcing bar, it is possible to easily grasp and align the intersecting position with the radial reinforcing bar when arranging the circumferential reinforcing bar, and the time required for the reinforcing bar arrangement can be shortened.

It is desirable that the circumferential reinforcing bars are embedded in a plurality of stages in the thickness direction of the reinforced concrete member.
In the present invention, a plurality of circumferential reinforcing bars and the like are embedded in order to reinforce the reinforced concrete member.

The reinforced concrete member is, for example, a bottom slab of an underground tank.
By applying the reinforced concrete member of the present invention to the bottom slab of an underground tank, it is possible to reduce the construction period and cost required for constructing the bottom slab of the underground tank.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a reinforced concrete member capable of reducing the construction period and cost.

The figure which shows the bottom plate 1. The figure which shows the upper reinforcing bar 3. The figure which shows the connection of the shear reinforcing bar 7. The figure explaining the reinforcement arrangement method of the upper reinforcing bar 3. The figure explaining the reinforcement arrangement method of the upper reinforcing bar 3. The figure explaining the reinforcement arrangement method of the upper reinforcing bar 3. The figure explaining the reinforcement arrangement method of the upper reinforcing bar 3. The figure which shows the radial reinforcing bar 15. The figure which shows the underground tank. The figure which shows the upper reinforcing bar 115.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The bottom slab 1 according to the embodiment of the present invention is shown in FIG. This bottom slab 1 is the bottom slab 1 of the underground tank, and the other configurations of the underground tank are substantially the same as those described in FIG. The bottom slab 1 is a disk-shaped reinforced concrete member.

As shown in FIG. 1, the bottom slab 1 is embedded with an upper reinforcing bar 3 and a lower reinforcing bar 5 which are horizontal reinforcing bars (main reinforcing bars), and a shear reinforcing reinforcing bar 7 which is a vertical reinforcing bar. The upper reinforcing bar 3 is embedded in a plurality of stages in the vicinity of the upper end of the bottom slab 1 in the thickness direction of the bottom slab 1, and the lower reinforcing bar 5 is similarly embedded in a plurality of stages in the vicinity of the lower end of the bottom slab 1.

As shown in FIG. 2, the uppermost reinforcing bar 3 has a grid-shaped reinforcing bar 13, a radial reinforcing bar 15, and a circumferential reinforcing bar 17.

The grid-shaped reinforcing bars 13 are arranged in a grid pattern in the center of the plane of the bottom plate 1.

The radial reinforcing bar 15 is arranged on the outer peripheral portion of the flat surface of the bottom plate 1. The radial reinforcing bars 15 are continuously arranged radially from the grid-like reinforcing bars 13 in the radial direction of the bottom slab 1.

The circumferential reinforcing bar 17 is arranged on the outer peripheral portion of the plane of the bottom slab 1 in a substantially circumferential shape along the circumferential direction of the bottom slab 1. The circumferential reinforcing bar 17 is arranged on the radial reinforcing bar 15 and is fixed to the radial reinforcing bar 15 by a number line or the like at a position where it intersects the radial reinforcing bar 15 on a plane.

In the present embodiment, the circumferential reinforcing bar 17 is added with a plurality of reinforcing bars 19 (19-1, 19-2, ..., 19-n) of a fixed length (for example, 12 m in length) that have been rolled (bent). Therefore, the bottom plate 1 is spirally arranged in the same plane from the start point 21 on the central side of the plane to the end point 22 on the outside of the plane. The distance d between the inner and outer reinforcing bars 19 is substantially constant (for example, 27.5 mm) except for the vicinity of the start point 21 and the end point 22. In the example of FIG. 2, a screw reinforcing bar is used as the reinforcing bar 19, and the reinforcing bar 19 is connected by using the mechanical joint 20.

Of the n reinforcing bars 19 constituting the circumferential reinforcing bar 17, the terminal reinforcing bar 19-n (reinforcing bar 19 at one end of the circumferential reinforcing bar 17) is cut as necessary to adjust the length. The remaining n-1 reinforcing bars 19 do not need to be cut and are all of the same length. If the terminal reinforcing bar 19-n is not cut, all the reinforcing bars 19 have the same length.

The remaining upper reinforcing bar 3 and lower reinforcing bar 5 have the same configuration as in FIG. 2. However, a normal (without screw) reinforcing bar 19 is used instead of the screw reinforcing bar, and a lap joint may be used instead of the mechanical joint 20. On the other hand, there is a possibility that the threaded reinforcing bars are connected by mechanical joints in all of the upper reinforcing bars 3 and the lower reinforcing bars 5.

The planar positions of the grid rebar 13, the radial rebar 15, and the circumferential rebar 17 correspond between all the upper rebars 3 and the lower rebars 5. As shown in part in FIG. 3, the shear reinforcing bar 7 is any of the intersections of the grid-like reinforcing bars 13, the radial reinforcing bars 15, and the circumferential reinforcing bars 17 which are in the same planar position in each of the upper reinforcing bars 3 and the lower reinforcing bars 5. It is attached to a shear and passed through a grid formed by these reinforcing bars.

The shear reinforcing bars 7 passed through the grid by the circumferential reinforcing bars 17 and the radial reinforcing bars 15 are arranged spirally at intervals along the circumferential reinforcing bars 17.

When arranging the upper reinforcing bar 3 in FIG. 2, the lattice-shaped reinforcing bars 13 and the radial reinforcing bars 15 are arranged as shown in FIG. 4, while the reinforcing bars 19 used for the circumferential reinforcing bars 17 are rolled. Since the radius of the circumferential reinforcing bar 17 is large and the reinforcing bar 19 is an elastic body and can follow the bending deformation, the reinforcing bar 19 for about 5 rounds of the spiral is rolled with the same curvature, and when the reinforcing bar 19 is arranged, the reinforcing bar 19 is rolled. It is also possible to fine-tune the curvature.

Next, these reinforcing bars 19 are sequentially arranged in a spiral shape. As shown in FIG. 5, the first reinforcing bar 19-1 is arranged counterclockwise with one end aligned with the start point 21.

One end of the second reinforcing bar 19-2 is connected to the other end of the reinforcing bar 19-1 by a mechanical joint 20 as shown in FIG. 6, and the second reinforcing bar 19-2 is arranged counterclockwise.

By repeating the same operation thereafter, the standard-sized reinforcing bars 19-1 to 19-n of the same length are arranged in a spiral shape from the start point 21 to the end point 22 in a one-push manner in the manner of one stroke. FIG. 7 shows an intermediate stage. If extra length (end reinforcement) appears in the terminal reinforcing bar 19-n, either cut off the excess length and remove it, or leave it as it is and arrange the reinforcement. As a result, the uppermost reinforcing bar 3 shown in FIG. 2 is formed.

As shown in FIG. 8, a marker 23 is formed by a choke or the like at a position where the radial reinforcing bar 15 intersects the circumferential reinforcing bar 17 on a plane. When arranging the circumferential reinforcing bars 17, the reinforcing bars 19-1 to 19-n are aligned and arranged so that the reinforcing bars 19-1 to 19-n intersect the radial reinforcing bars 15 at the position of the marker 23. Reinforcing bars 19-1 to 19-n are fixed to the radial reinforcing bars 15 at that position.

The method of arranging the remaining upper reinforcing bars 3 and lower reinforcing bars 5 is substantially the same as described above. However, the joint between the reinforcing bars 19 may be a lap joint.

As described above, in the present embodiment, since the circumferential reinforcing bars 17 are arranged in a spiral shape in the same plane, the closing portion of the ring as described above does not exist, and the extra length of the reinforcing bars 19 hardly occurs. .. Therefore, the waste of the reinforcing bar 19 and the cutting portion of the reinforcing bar 19 are minimized, and the amount of the reinforcing bar to be purchased can be reduced. In addition, since the number of joints between the reinforcing bars 19 can be reduced, the construction period and cost can be reduced.

Further, in the present embodiment, since the reinforcing bars 19 having the same length are used for most of the circumferential reinforcing bars 17, the reinforcing bars 19 purchased in bulk at a fixed scale can be used as they are without being cut.

Further, by forming the marker 23 on the radial reinforcing bar 15, when arranging the reinforcing bar 19, the intersecting position with the radial reinforcing bar 15 can be easily grasped and aligned, which is required for the reinforcing bar arrangement. You can save time.

Further, in the present embodiment, since the circumferential reinforcing bars 17 and the like are embedded in a plurality of stages as the upper reinforcing bars 3 and the lower reinforcing bars 5, the bottom slab 1 can be suitably reinforced.

However, the present invention is not limited to this. For example, the present embodiment is an example of the bottom slab 1 of the underground tank, whereby the cost for constructing the bottom slab of the underground tank can be reduced. The same applies to reinforced concrete structures. Further, the grid-like reinforcing bars 13 in the central portion can be omitted.

Further, in the present embodiment, all the parts of the circumferential reinforcing bar 17 are arranged in a spiral shape in the same plane, but depending on the shape of the bottom plate 1, for example, the outer peripheral portion of the circumferential reinforcing bar 17 moves upward as it goes outward. It may be arranged so as to face each other, and it is sufficient that at least a part of the circumferential reinforcing bars 17 is arranged in a spiral shape in the same plane.

Further, in the present embodiment, the reinforcing bar arrangement method for arranging the reinforcing bars 19 continuously from the start point 21 to the end point 22 of the circumferential reinforcing bar 17 has been described, but the circumferential reinforcing bar 17 is divided into several sections and the reinforcing bars 19 are simultaneously arranged from the start point of each section. It is also possible to arrange. When connecting the reinforcing bars 19 with lap joints, allow some margin in the lap joint length of the connection portion of each section. When the reinforcing bar 19 is connected by the mechanical joint 20, the reinforcing bar 19 is precisely cut at the connecting portion of each section. Further, although the circumferential reinforcing bars 17 are arranged counterclockwise in the present embodiment, the same effect can be obtained even if they are arranged clockwise.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art can come up with various modified or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1, 111: Bottom slab 3, 115: Upper rebar 5, 117: Lower rebar 7, 113: Shear reinforcement rebar 13, 121: Lattice rebar 15, 123: Radial rebar 17, 125: Circumferential rebar 19: Reinforcing bar 20 127: Mechanical joint 21: Start point 22: End point 23: Marker 107: Underground continuous wall 109: Side wall 119: Steel roof 129: Closure

Claims (5)

It is a disk-shaped reinforced concrete member,
Circumferential reinforcing bars and shear reinforcing bars are buried,
At least a portion of the circumferential reinforcing bar are arranged in a spiral shape in the same plane, the shear reinforcing rebar is characterized Rukoto spaced helically along the circumferential direction reinforcing bar Reinforced concrete member. The reinforced concrete member according to claim 1, wherein the circumferential reinforcing bar is formed by adding a plurality of reinforcing bars, and the reinforcing bars other than the reinforcing bar at one end of the circumferential reinforcing bar have the same length. More radial rebars are buried,
The reinforced concrete member according to claim 1 or 2, wherein the radial reinforcing bar and the circumferential reinforcing bar intersect at the position of a marker formed on the radial reinforcing bar. The reinforced concrete member according to any one of claims 1 to 3, wherein the circumferential reinforcing bar is embedded in a plurality of stages in the thickness direction of the reinforced concrete member. The reinforced concrete member according to any one of claims 1 to 4, wherein the reinforced concrete member is a bottom slab of an underground tank.

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