JP6470908B2 - Fitting structure, breakwater - Google Patents

Description

  The present invention relates to a joint structure and a structure having the joint structure.

  As one of the joints, a joint with a fixing body is known. FIG. 5 shows an example of a joint structure using a joint 11 with a fixing body in a horizontal section, in which concrete precast blocks 1 provided with the joint 11 with a fixing body are connected to each other.

  In the joint 11 with the fixing body, a fixing body 11b having a width wider than the reinforcing bar 11a is provided at the tip of the reinforcing bar 11a protruding from the precast block 1. In FIG. 5, a pair of precast blocks 1 are arranged with a joint 2 made of concrete or the like, and a joint 11 with a fixing body of both precast blocks 1 is wrapped in a vertical direction (corresponding to the normal direction of the drawing sheet). It is buried in the joint 2. In addition to the joint 11 with the fixing body, a reinforcing bar 15 is also arranged in the joint 2.

  By providing the fixing body 11b at the tip of the reinforcing bar 11a as described above, there is an advantage that the fixing effect is enhanced as shown in Patent Document 1. Therefore, when the joint 11 with the fixing body is used, the wrap length is less than that in the case where a normal reinforcing bar is used for the joint, and the length of the joint 2 between the precast blocks 1 can be shortened.

JP 2009-293289 A

  However, the cover thickness of the joint 11 with the fixing body is determined by the distance from the outer surface 20 of the joint 2 to the fixing body 11b as shown in FIG. 5A. Shorter than distance. Therefore, in order to ensure a predetermined cover thickness, it is necessary to form the joint 2 thick, which is uneconomical.

  Patent Document 1 describes a structure in which a fixing body is provided at the tip of a main bar of a beam, but it does not relate to a joint structure and does not consider the above-described problems.

  The present invention has been made in view of the above problems, and an object thereof is to provide an economical joint structure using a joint with a fixing body.

1st invention for solving the subject mentioned above is the joint structure between the precast blocks of the same member thickness, Comprising: The said precast block is wider than the said bar at the front-end | tip part of the bar which protrudes from the said precast block. Each having a fixing member with a large fixing member, and a pair of the precast blocks are arranged with a joint interposed therebetween, and the joint with the fixing member of each of the precast blocks is embedded in each joint. The joint with the fixing body of the precast block is bent in the direction from the outer surface closest to the starting point of the joint toward the inside of the joint from the middle starting point of the bar to the fixing body, and one of the precast blocks The portion of the joint with the fixing body from the precast block to the start point of the bar, and the other front A portion from the precast block to the start point of the bar of the joint with the fixing body of the precast block is disposed overlapping when viewed from a direction orthogonal to the bar and parallel to the outer surface. It is the joint structure characterized by this.

  As a result, the distance from the outer surface of the joint to the fixing body can be increased, and the cover thickness of the joint with the fixing body can be increased. Therefore, as described above, a predetermined cover thickness can be secured without increasing the joint, which is economical. Furthermore, since the fixing body is buried deep in the joint, the fixing effect is further increased.

The distance between the fixing body and the outer surface needs to be equal to or greater than the distance between the starting point of the bar and the outer surface from the viewpoint of securing a predetermined cover thickness without increasing the joint.
Thereby, the cover thickness of the joint with the fixing body becomes the distance from the outer surface of the joint to the bar of the joint with the fixing body, and the cover thickness is the same as that of the normal joint without the fixing body.

A plurality of reinforcing bars in a direction perpendicular to the bar and parallel to the outer surface are provided in the joint along the arrangement direction in which the precast blocks are arranged in the vicinity of the joint with the fixing body. It is desirable that a portion from the starting point to the tip of the fixing body be within the pitch in the arrangement direction of the adjacent reinforcing bars. For example, the bending angle of the bar is 20 degrees or less.
As described above, in the present invention, it is only necessary to bend the joint with the fixing body a little, there is little interference with other reinforcing bars and the like, and it does not interfere with the bar arrangement work.

A plurality of reinforcing bars in a direction perpendicular to the bar and parallel to the outer surface are provided in the joint along the arrangement direction in which the precast blocks are arranged in the vicinity of the joint with the fixing body. It is desirable that a portion from the precast block to the start point is disposed at a position closer to the outer surface than the reinforcing bar.
In this way, when the joint with the fixing body is at the outermost edge of the joint, the cover thickness up to the joint with the fixing body is important when designing the joint thickness, and it is particularly effective to bend the joint with the fixing body. Become.

2nd invention is a liquid-breakwater which has the joint structure of 1st invention in the said joint between the said precast blocks adjacent to the circumferential direction .

  According to the present invention, an economical joint structure or the like using a joint with a fixing body can be provided.

The figure which shows the joint structure 10 The figure which shows the coupling 11 with a fixing body The figure which shows the LNG tank 100 The figure which shows the joint structure 10a The figure which shows the joint structure by the joint 11 with a fixing body

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

[First embodiment]
FIG. 1 is a view showing a joint structure 10 according to the first embodiment of the present invention, and shows a horizontal section of the joint structure 10 as in FIG.

  The joint structure 10 of this embodiment is different from the joint structure shown in FIG. 5 in that the joint 11 with a fixing body is bent. In other words, the joint 11 with the fixing body extends from the outer surface 20 of the joint 2 closest to the starting point 111 to the inside of the joint 2 from the starting point 111 in the middle of the reinforcing bar 11a (bar) to the fixing body 11b at the tip. It can be bent.

  The reinforcing bars 15 are arranged in the vicinity of the joint 11 with the fixing body and in a direction (corresponding to the normal direction of the paper surface) perpendicular to the reinforcing bars 11 a and parallel to the outer surface of the joint 2. A plurality of reinforcing bars 15 are provided in the arrangement direction (corresponding to the left-right direction in the drawing) of the precast blocks 1 (hereinafter sometimes referred to as blocks).

  In the example of FIG. 1, the portion from the block 1 to the starting point 111 of the reinforcing bar 11 a of the joint 11 with the fixing body is disposed at a position closer to the outer surface 20 than the reinforcing bar 15. That is, the joint 11 with the fixing body is disposed at the outermost edge of the joint 2.

  FIG. 2 is a diagram showing conditions for bending the joint 11 with the fixing body. In the present embodiment, fixing is performed by bending the reinforcing bar 11a of the joint 11 with the fixing body so that the distance B1 from the outer surface 20 of the joint 2 to the fixing body 11b is equal to or greater than the distance B2 from the outer surface 20 to the starting point 111. The cover thickness of the body-attached joint 11 can be set to the distance B2 from the outer surface 20 of the joint 2 to the reinforcing bar 11a.

  In this embodiment, since the joint 11 with the fixing body is at the outermost edge of the joint 2, the distance B 2 is the minimum value of the cover thickness of the joint 2, and the thickness of the joint 2 is set so that the distance B 2 becomes a predetermined value. Can be determined.

  Further, a portion C1 from the starting point 111 of the reinforcing bar 11a to the tip of the fixing body 11b is arranged so as to be within the pitch C2 of the reinforcing bars 15 adjacent in the arrangement direction of the blocks 1, for example. Furthermore, the bending angle of the reinforcing bar 11a, that is, the angle α formed by the direction a2 from the starting point 111 toward the fixing body 11b with respect to the direction a1 of the reinforcing bar 11a immediately before the starting point 111 is preferably 20 degrees or less, for example, around 10 degrees.

  As described above, by simply bending the joint 11 with the fixing body, the interference with the other reinforcing bars 15 and the like is small, and the bar arrangement work is not hindered.

  In order to construct the joint structure 10, the pair of blocks 1 provided with the joint 11 with the fixing body bent as described above are arranged to face each other as shown in FIG. The joint 2 may be formed by placing concrete between the blocks 1.

FIG. 3 shows an example of a structure including the joint structure 10 LNG (Liquefied Natural
1 is a diagram illustrating a gas (liquefied natural gas) tank 100. FIG. The LNG tank 100 is an above-ground tank that stores LNG. The bottom plate 50 is provided with a liquid barrier 30 and an inner tank (not shown) made of a metal plate or the like and an outer tank 40 are installed therein.

  The breakwater 30 is provided to prevent leakage of liquid to the outside of the LNG even when the inner tank or the outer tank 40 is damaged. In the present embodiment, the liquid breakwater 30 is constructed by arranging the blocks 1 in the circumferential direction of the liquid breakwater 30 and stacking them in the vertical direction. At that time, the joint 11 with the fixing body of the block 1 is bent as described above, and the joint 2 is formed between the adjacent blocks 1, thereby the joint structure 10 is constructed.

  Although FIG. 1 shows the case where the blocks 1 are arranged in the horizontal direction as the joint structure 10, the same joint structure 10 is constructed even when the blocks 1 are arranged in the vertical direction with the joint 2 interposed therebetween. In the breakwater 30, prestress is introduced by vertical and circumferential tendons (not shown), and in the block 1, a sheath tube (not shown) for passing the tendons is also provided.

  As described above, according to the present embodiment, by bending the joint 11 with the fixing body, the distance from the outer surface 20 of the joint 2 to the fixing body 11b can be increased, and the cover thickness of the joint 11 with the fixing body is increased. it can. Therefore, a predetermined cover thickness can be secured without making the joint 2 thick, which is economical. Further, since the fixing body 11b is buried deep in the joint 2, the fixing effect is further increased.

  In the present embodiment, the joint 11 with the fixing body 11 is bent so that the distance B1 between the fixing body 11b and the outer surface 20 is equal to or greater than the distance B2 between the starting point 111 of the reinforcing bar 11a and the outer surface 20. The cover thickness is the distance from the outer surface 20 to the reinforcing bar 11a, and the cover thickness is the same as a normal joint without the fixing body 11b.

  In the present embodiment, the joint 11 with the fixing body is at the outermost edge of the joint 2, and the cover thickness of the joint 11 with the fixing body is the minimum value of the cover thickness of the joint 2. It becomes important to bend the joint 11 with the fixing body particularly effectively.

  Further, in the present embodiment, the portion from the starting point 111 for bending the reinforcing bar 11a of the joint 11 with the fixing body to the fixing body 11b is accommodated within the pitch of the reinforcing bars 15, and the bending angle is set to 20 degrees or less so that the fixing body is attached. The joint 11 is only bent a little, and there is little interference with other reinforcing bars 15 and the like, which does not interfere with the bar arrangement work.

  However, the present invention is not limited to the above. For example, although the LNG tank 100 is shown as an example of the structure having the joint structure 10 in the present embodiment, the present invention is not limited to this, and the joint structure 10 can be applied to various structures. For example, the present invention can be applied to connection between column members using a precast block, connection between beam members, connection between a column member and a beam member, or the like.

  Further, in the present embodiment, as shown in FIG. 1, the joints 11 with fixing bodies on both sides in the thickness direction of the joint 2 (corresponding to the vertical direction in the figure) are bent, but not limited to this, fixing is performed only on one side. You may bend the joint 11 with a body. Further, the shape of the fixing body 11b is not particularly limited as long as it is wider than the reinforcing bar 11a.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The second embodiment will mainly describe differences from the first embodiment, and the same points will be denoted by the same reference numerals in the drawings and the like, and description thereof will be omitted.

  In the second embodiment, as shown in FIG. 4A, the joint 11 with the fixing body is not located at the outermost edge of the joint 2, and is reinforced at a position closer to the outer surface 20 of the joint 2 than the reinforcing bar 11 a of the joint 11 with the fixing body. A streak 15 is arranged. However, the distance A from the outer surface 20 to the fixing member 11b is smaller than the distance from the outer surface 20 to the reinforcing bar 15 due to the large width of the fixing member 11b.

  Also in this case, as shown in the joint structure 10a of FIG. 4B, the joint 11 with the fixing body is formed from the outer surface 20 of the joint 2 closest to the starting point 111 from the starting point 111 in the middle of the reinforcing bar 11a to the fixing body 11b. It is effective to bend it in the direction toward.

  FIG. 4C is a diagram showing conditions for bending the joint 11 with the fixing body. In the second embodiment, the reinforcing bar 11a of the joint 11 with the fixing body is bent so that the distance B1 from the outer surface 20 of the joint 2 to the fixing body 11b is equal to or longer than the distance B2 from the outer surface 20 to the reinforcing bar 15. Thus, the minimum value of the cover thickness of the joint 2 is the distance B2 from the outer surface 20 of the joint 2 to the reinforcing bar 15, and the thickness of the joint 2 can be determined so that this distance B2 becomes a predetermined value.

  The portion C1 from the starting point 111 of the reinforcing bar 11a to the tip of the fixing body 11b can be disposed so as to be within the pitch C2 of the reinforcing bar 15, for example, as described above. The bending angle of the reinforcing bar 11a can be the same as described above.

  In the second embodiment, the same effect as that of the first embodiment can be obtained. By increasing the distance from the outer surface 20 of the joint 2 to the fixing body 11b, a predetermined cover thickness can be obtained without making the joint 2 thick. It is economical because it can be secured.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

DESCRIPTION OF SYMBOLS 1; Precast block 2; Joint 10, 10a; Joint structure 11; Joint 11a with fixing body; Reinforcing bar 11b; Fixing body 15; Reinforcing bar 20; Outer surface 111; Start point 30; LNG tank

Claims (6)

A joint structure between precast blocks of the same member thickness ,
The precast block has a joint with a fixing body in which a fixing body having a width larger than the bar is provided at a tip portion of the bar protruding from the precast block,
A pair of the precast blocks are arranged across the joint,
In the joint, the joint with the fixing body of each precast block is embedded,
The joint with the fixing body of each of the precast blocks is bent in the direction from the outer surface closest to the starting point of the joint toward the inside of the joint from the middle starting point of the bar to the fixing body,
From the precast block to the start point of the bar of the joint with the fixing body of one of the precast blocks and from the precast block to the start point of the bar of the joint with the fixing body of the other precast block The joint structure is arranged so as to overlap when viewed from a direction orthogonal to the bar and parallel to the outer surface.   The joint structure according to claim 1, wherein a distance between the fixing body and the outer surface is equal to or greater than a distance between the starting point of the bar and the outer surface. In the joint, a plurality of reinforcing bars in a direction orthogonal to the bar and parallel to the outer surface are provided in the vicinity of the joint with the fixing body along the arrangement direction in which the precast blocks are arranged,
3. The joint structure according to claim 1, wherein a portion from the starting point of the bar to the tip of the fixing body is within a pitch in the arrangement direction of the adjacent reinforcing bars.   The joint structure according to any one of claims 1 to 3, wherein a bending angle of the bar is 20 degrees or less. In the joint, a plurality of reinforcing bars in a direction orthogonal to the bar and parallel to the outer surface are provided in the vicinity of the joint with the fixing body along the arrangement direction in which the precast blocks are arranged,
The joint structure according to any one of claims 1 to 4, wherein a portion of the bar from the precast block to the start point is disposed at a position closer to the outer surface than the reinforcing bar. A liquid breakwater having the joint structure according to any one of claims 1 to 5 at the joint between the precast blocks adjacent in the circumferential direction .

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