JP2005325645A - Joint structure of concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a concrete structure capable of preventing the joint opening between joint faces 3, 4 of concrete members 1, 2. <P>SOLUTION: Joint members 5, 6 embedded adjacent to these joint faces 3, 4 are mutually fastened by a male-female screw mechanism 8 to concrete members 1, 2 adjacent in the contact state at mutual joint faces 3, 4. A space S allowing the joint members 5, 6 to receive a deforming force in the mutually accessing direction is formed in these joint members 5, 6. The deforming force generating in these joint members 5, 6 by the fastening force of the male-female screw mechanism 8 transfers to these concrete members 1, 2 through these joint members 5, 6 and act as a mutual compressing force at the joint faces 3, 4 of the concrete members 1, 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure for joining concrete structures such as precast concrete members.

  With the recent increase in the thickness of concrete structures, the stress applied to the joints between the concrete members has also increased, and the ability required for the joining means between the concrete members has increased. Therefore, various joining means that are strong against a large stress and excellent in durability are employed. However, the current mainstream of joining means from the relationship with cost and performance is “joining means using PC steel” shown in FIG. 7 and “joining means using bolts” shown in FIG. In the “joining means by PC steel” shown in FIG. 7, the long male screw rods 16 are connected to the joint surfaces 3, 4 with respect to the adjacent concrete members 1, 2 in contact with each other at the joint surfaces 3, 4. It is inserted over the fastening surfaces 17 and 18 which are opposite to the joint surfaces 3 and 4, and the female screw bodies 19 are screwed to both ends of the male screw rod 16 at the fastening surfaces 17 and 18, so that both concrete members 1 , 2 are fastened to each other between the fastening plates 20, 21. In the “joining means using bolts” shown in FIG. 8, the joints embedded in the adjacent concrete members 1 and 2 adjacent to each other at the joint surfaces 3 and 4 are buried adjacent to the joint surfaces 3 and 4, respectively. The members 5 and 6 are fastened and brought into contact with each other by the bolts 12 and the nuts 13, and the concrete members 1 and 2 are fastened to each other by the fastening force with respect to the joint members 5 and 6.

  In the “joining means using PC steel”, the fastening surfaces 17 and 18 are sufficiently separated from the joining surfaces 3 and 4, so that the compressive stress caused by the fastening plates 20 and 21 is applied to the fastening surfaces 17 and 18. From both of the concrete members 1 and 2 to spread over a wide range and spread over the entire joining surfaces 3 and 4. Therefore, even if tensile stress acts on the joint surfaces 3 and 4 of both concrete members 1 and 2, the compressive stress and the tensile stress cancel each other at the joint surfaces 3 and 4, and each joint surface 3 is caused by the tensile stress. , 4 are separated from each other. However, in the “joining means using bolts”, the clamping force with respect to each of the joining members 5, 6 is absorbed as a pressing force for bringing the joining members 5, 6 into contact with each other, and the compressive stress due to the tightening force is applied to each joining member 5. , 6 is propagated only to a part of it. Accordingly, although compressive stress is applied to the joint surfaces 3 and 4 of the concrete members 1 and 2 in the vicinity of the joint members 5 and 6, the compressive stress is applied to the joint surfaces 3 and 4 as the distance from the joint members 5 and 6 increases. It becomes difficult, and the opening between each joint surface 3 and 4 also becomes large. Such a result is obtained under the condition that the tensile stress applied to the male threaded rod 16 in the “PC steel joining means” and the tensile stress applied to the bolt 12 in the “bolt joining means” are equal. The difference in the amount of opening may occur even if the compressive stress applied by the male threaded rod 16 and the compressive stress applied by the bolt 12 are equivalent. I understand.

  In the present invention, there is a difference in the amount of openings between the “joining means using PC steel” and the “joining means using bolts” due to a difference in compressive stress transmitted from each joining member to each joining surface. Paying attention to the fact that the "joining means using bolts", which is more advantageous than the "joining means using PC steel", is improved in terms of the cost of joining parts and the simplicity of joining work, and the opening between each joining surface is improved. The purpose is to suppress.

  Drawing of postscript embodiment (1st Embodiment shown in FIG. 1, The other example of 1st Embodiment shown in FIG. 2, 2nd Embodiment shown in FIG. 3, 3rd Embodiment shown in FIG. 4, 1st Embodiment shown in FIG. The fourth embodiment, the fifth embodiment shown in FIG.

The joint structure of the concrete structure according to the invention of claim 1 is configured as follows.
Fastening joint members (5, 6) embedded adjacent to the joint surfaces (3, 4) with respect to the adjacent concrete members (1, 2) in contact with each other at the joint surfaces (3, 4) They are fastened together by (8). Between the joining members (5, 6), a deformation permitting portion (S) that allows the joining members (5, 6) to receive a deformation force approaching each other by the fastening force of the fastener (8). ). The deformation force generated in these joining members (5, 6) by the fastening force of the fastener (8) is transmitted to these concrete members (1, 2) via these joining members (5, 6). The joint surfaces (3, 4) of the concrete members (1, 2) work as a pressure contact force. For example, as a fastener, a male / female screw mechanism (8) may be employed as in the invention of claim 5, but a clamp (not shown) that can be opened and closed may also be employed.

  In the invention of claim 1, the compressive stress due to the fastening force of the fastener (8) is easily exerted on the joint surfaces (3, 4) of the concrete members (1, 2), and between the joint surfaces (3, 4). Opening can be suppressed.

  In the invention of claim 2 premised on the invention of claim 1, the joining members (5, 6) are connected to each other by a fastener (8) via a deformation allowing portion (S). And the transmission part (9, 10) which propagates the deformation force which arises in these connection parts (7) to the concrete members (1, 2). In invention of Claim 2, it becomes easy to propagate the fastening force of a fastener (8) to a concrete member (1, 2) via a joining member (5, 6).

  In the invention of claim 3 based on the invention of claim 1 or claim 2, the deformation allowing portion is provided between the joining members (5, 6) embedded in the concrete members (1, 2) adjacent to each other. A void (S) or a deformable body. In invention of Claim 3, it becomes easy to deform | transform a joining member (5, 6) with a simple structure.

  The invention according to claim 4 based on claim 1 or claim 2, wherein the deformation allowing portion is a gap provided between the joining members (5, 6) embedded in the concrete members (1, 2) adjacent to each other. (S), in which the gap (S) is filled with the solidifying material (14) in a fastening state by the fastener (8). In the invention of claim 4, the joining member (5, 6) can be easily deformed with a simple structure, and the deformation state of the joining member (5, 6) can be easily maintained by the solidifying material (14).

  In the invention of claim 5 based on the invention of any one of claims 1 to 4, the fastener is a male and female screw mechanism (8). In the invention of claim 5, a fastener having a simple structure can be provided.

  The present invention can suppress the opening between the joint surfaces (3, 4) of the concrete members (1, 2) in the "joint means by bolt" which is more advantageous than the "joint means by PC steel". .

First, the joint structure of the concrete structure concerning 1st Embodiment of this invention is demonstrated with reference to FIG.
In this concrete structure, both concrete members 1 and 2 (precast concrete walls) arranged adjacent to each other are connected by a joining means M in a state where they are in contact with each other at their flat joining surfaces 3 and 4. . In this joining means M, a plurality of sets of both joining members 5 and 6 are embedded in the respective concrete members 1 and 2 adjacent to their joining surfaces 3 and 4, and a male and female screw mechanism is provided at the connecting plate 7 (connecting portion). 8 (fasteners) are fastened together. In addition to the connecting plate 7 (connecting portion), the joining members 5 and 6 are connected to the transmission plate 9 (transmitting portion) attached in parallel to each other on both sides of the connecting plate 7, and both the transmitting plates 9. On the other hand, a transmission rod 10 (transmission portion) attached in parallel to each other is provided. On the wall surfaces 1a and 2a adjacent to each other in the upper and lower concrete members 1 and 2, a single hollow portion 11 is provided between the joint members 5 and 6 in each set adjacent to the joint surfaces 3 and 4, respectively. The connecting plate 7 and both transmission plates 9 of the joining members 5 and 6 are exposed in the hollow portion 11, and both transmission rods 10 of both the joining members 5 and 6 are connected to the concrete members 1 and 2 from both the transmission plates 9. Is extended obliquely in the vertical direction.

  In each of the hollow portions 11, the connecting plates 7 of both the joining members 5 and 6 are both arranged so as to be slightly separated inward from the assumed surface P including the joining surfaces 3 and 4, and are separated from each other. A space S (deformation allowing portion) is formed between them. In the male and female screw mechanism 8, a nut 13 is screwed into a bolt 12 inserted through both connection plates 7, and a head 12 a of the bolt 12 is disposed between the transmission plates 9 on one connection plate 7 side. In addition, a nut 13 is disposed between the transmission plates 9 on the other connecting plate 7 side. Since there is a gap S between the two connecting plates 7, when the bolt 12 and the nut 13 are fastened to each other, a deformation force in the direction in which the connecting plates 7 approach each other is received by their fastening force. The deformation force of the two connecting plates 7 is also transmitted to the two transmission plates 9 and the two transmission rods 10, and is transmitted from the entire joint members 5 and 6 to the two concrete members 1 and 2, and the joint surfaces 3 between them. 4 work as pressure contact with each other. In that case, unevenness is provided in the adhering part of the joining members 5 and 6 to the concrete members 1 and 2, an adhesive is applied to the adhering part, and the joining members 5 and 6 are fixed to the internal reinforcing bars. As shown in FIG. 2 as another example of the first embodiment, the resistance plate 10a is attached to the transmission rod 10 or the edge portions of the joining members 5 and 6 are attached. It can be processed into a shape that easily propagates, and the compression stress can be propagated efficiently. Although not shown, an elastic body (deformable body) such as rubber that can perform the same function as the gap S may be interposed between the connecting plates 7.

In the fastened state by the male and female screw mechanism 8, the solidified material 14 is filled in the cavity 11 including the gap S.
Incidentally, the joining members 5 and 6 can be designed by various existing methods so that the optimum compressive force and the distribution state can be obtained on the joining surfaces 3 and 4 of the both concrete members 1 and 2. In addition, as shown in FIG. 1, since the apex angle is 45 degrees and the cone breakage causes pulling failure from the pulling resistance point, the transmission stress point (the region between the two-dot chain line and the joint surfaces 3 and 4) is assumed. did.

The second embodiment shown in FIG. 3 is mainly different from the first embodiment in the following points.
One of the connecting plates 7 of both the joining members 5 and 6 is arranged so that one connecting plate 7 coincides with the assumed surface P including the joining surfaces 3 and 4, and the other connecting plate 7 is slightly separated inward from the assumed surface P. It is provided and is separated from one connecting plate 7, and a gap S is formed between both connecting plates 7.

The third embodiment shown in FIG. 4 is mainly different from the first embodiment in the following points.
A concrete member formed integrally with a female screw cylinder 15 (joining member including a connecting portion and a transmitting portion) inserted in place of one joining member 5 of both joining members 5 and 6 in the first embodiment. 1 is buried. The connecting plate 7 of the other joining member 6 among the joining members 5 and 6 in the first embodiment coincides with the assumed surface P including the joining surfaces 3 and 4. The end portion (connecting portion) of the female screw cylinder 15 is disposed so as to be slightly away from the assumed surface P and is separated from the connecting plate 7 of the joining member 6, and the end portion of the female screw cylinder 15 and the joining member are separated. A gap S is formed between the six connecting plates 7. In the male and female screw mechanism 8, a bolt 12 inserted through the connecting plate 7 of the joining member 6 is screwed into the female screw cylinder 15, and a head portion 12 a of the bolt 12 is disposed between both transmission plates 9 of the joining member 6. The Since there is a gap S between the connecting plate 7 and the end of the female threaded cylinder 15, when the bolt 12 is tightened to the female threaded cylinder 15, the fastening force between the end of the connecting plate 7 and the female threaded cylinder 15 Receive deformation forces in the direction of approaching each other. The deformation force is transmitted to both transmission plates 9, both transmission rods 10 and the entire female threaded cylinder 15, and is transmitted from the entire joining member 6 and the entire female threaded cylinder 15 to both concrete members 1 and 2 and joined between them. The surfaces 3 and 4 work as pressure contact with each other.

The fourth embodiment shown in FIG. 5 is mainly different from the third embodiment in the following points.
The end of the female screw cylinder 15 coincides with the assumed plane P including the joint surfaces 3 and 4. The connecting plate 7 of the joining member 6 is disposed so as to be slightly away from the assumed plane P inwardly, and is separated from the end of the female screw cylinder 15. The end of the female screw cylinder 15 and the connecting plate 7 of the joining member 6 A gap S is formed between the two.

The fifth embodiment shown in FIG. 6 is mainly different from the first embodiment in the following points.
In the first embodiment, the joint surfaces 3 and 4 of the both concrete members 1 and 2 are flat, but in this fifth embodiment, the joint surfaces 3 and 4 of the both concrete members 1 and 2 are uneven. It has become. In this case, the assumed surface P including the joint surfaces 3 and 4 means the assumed surface P including a part of the joint surfaces 3 and 4 aligned with the cavity portion 11.

(A) is sectional drawing which looked at the joining structure of the concrete structure concerning 1st Embodiment from the side, and (b) is sectional drawing similarly seen from the front side. (A) is sectional drawing which looked at the joining structure of the concrete structure concerning another example of 1st Embodiment from the side surface side, (b) is sectional drawing similarly seen from the front side. (A) is sectional drawing which looked at the joining structure of the concrete structure concerning 2nd Embodiment from the side surface side, (b) is sectional drawing similarly seen from the front side. (A) is sectional drawing which looked at the joining structure of the concrete structure concerning 3rd Embodiment from the side surface side, (b) is sectional drawing similarly seen from the front side. (A) is sectional drawing which looked at the joint structure of the concrete structure concerning 4th Embodiment from the side, and (b) is sectional drawing similarly seen from the front side. (A) is sectional drawing which looked at the joining structure of the concrete structure concerning 5th Embodiment from the side, and (b) is sectional drawing similarly seen from the front side. (A) is sectional drawing which looked at the junction structure of the conventional concrete structure from the side, and (b) is sectional drawing similarly seen from the front side. (A) is sectional drawing which looked at the junction structure of the conventional concrete structure from the side, and (b) is sectional drawing similarly seen from the front side.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,2 ... Concrete member, 3,4 ... Joining surface, 5,6 ... Joining member, 7 ... Connection board (connection part), 8 ... Female and male screw mechanism (fastener), 9 ... Transmission board (transmission part), 10 ... transmission rod (transmission portion), 14 ... solidified material, S ... gap (deformation allowance portion).

Claims (5)

The joint members buried adjacent to the joint surfaces are fastened to the concrete members adjacent to each other with the joint surfaces in contact with each other by fasteners, and these joint members are tightened by the fastening force of the fasteners. A deformation allowing portion that allows the joining members to receive deformation forces in directions approaching each other, and the deformation force generated in these joining members by the fastening force of the fasteners is passed through these joining members to these concrete members. A joint structure of a concrete structure characterized in that it acts as a pressing force on the joint surfaces of these concrete members. The said joining member is provided with the connection part fastened together via a deformation | transformation permission part with a fastener, and the transmission part which propagates the deformation force which arises in these connection parts to a concrete member, It is characterized by the above-mentioned. The joint structure of the concrete structure according to 1. 3. The joint structure for a concrete structure according to claim 1, wherein the deformation permitting portion is a gap or a deformable body provided between joint members embedded in adjacent concrete members. The said deformation | transformation permission part is the space | gap provided between the joining members embed | buried in the mutually adjacent concrete member, Comprising: The solidification material was embed | buried under this space | gap in the fastening state by the said fastener. The joint structure of the concrete structure as described in 2. The joint structure for a concrete structure according to any one of claims 1 to 4, wherein the fastener is a male and female screw mechanism.

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