PCa joint material

Abstract

To provide a PCa joint member which has PCa members connected to each other via tendons in an unbonded state, capable of inhibiting or suppressing the breakage of the PCa members in a joint area due to the rust development of the tendons or the collision of the tendons with sheath pipes.SOLUTION: A PCa joint member 100 has PCa members 10, 20 including a plurality of precast-concrete sheath pipes 16, 26 joined to each other while allowing the communication of the corresponding sheath pipes 16, 26 therewith to form a communication sheath pipe 30. Tendons 17, 27 are inserted into all the communication sheath pipes 30, the tendons 17, 27 are strained in an unbonded state. and a rust-proofing material 50 is applied to a joint area A straddling a joint interface 80 between at least two PCa members 10, 20, out of the tendons 17, 27.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a PCa joint member. [Background technology]

[0002] For example, when using on-site concrete pouring to construct joints between columns on upper and lower floors in reinforced concrete (RC) structures, joints between RC columns and beams, or joints in hybrid structures between RC columns and steel beams, construction time can be lengthy. This issue is particularly pronounced in high-rise buildings. Therefore, a construction method is sometimes used in which the columns or columns and joints on both floors are made of precast concrete (hereinafter referred to as "PCa"), and the PCa columns and joints (both included in PCa components) are transported to the site and assembled to form PCa joint components, thereby integrating them with minimal grouting. This construction method for PCa joint components significantly shortens construction time, including for high-rise buildings, and enables the construction of buildings with high structural reliability, since continuous column and column-beam joints are formed using PCa components. Among the methods for constructing PCa joint members, construction time can be further shortened by constructing precast prestressed concrete (hereinafter referred to as "PCaPC") joint members by tensioning the PCa members with tendons such as PC (Prestressed Concrete) steel bars or PC steel wires and fastening them together.In this specification, PCaPC joint members are considered to be included in PCa joint members, and their constituent PCaPC members are considered to be included in PCa members.

[0003] The PCa components typically have multiple sheath tubes inside. When connecting PCa components, the corresponding sheath tubes are connected to form a continuous sheath tube. Tendons are inserted into the continuous sheath tubes and tensioned. Then, grout is filled into the continuous sheath tubes to bond the tendons. This connects the PCa components together. However, filling the continuous sheath tubes with grout is time-consuming, and this issue becomes even more pronounced as the number of continuous sheath tubes increases and the number of grout-filled areas increases with the rise of taller buildings. Furthermore, the curing period required for the grout filled in the continuous sheath tubes to develop a predetermined strength can significantly extend the construction period.

[0004] Patent Document 1 proposes a high-rise building equipped with precast prestressed concrete columns. This high-rise building is equipped with a plurality of precast prestressed concrete columns, each having a tension member inserted vertically into a concrete column body, and a plurality of vibration control devices that suppress the swaying of the building. The precast prestressed concrete columns have tension members disposed in the concrete column body in an unbonded state, and the vibration control devices suppress the swaying of the high-rise building by keeping deformation of the tension members due to the swaying of the high-rise building within the elastic range of the tension members. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-19664 Summary of the Invention [Problem to be solved by the invention]

[0006] The high-rise building described in Patent Document 1 uses unbonded tendons to solve the above-mentioned problems associated with grout filling. However, when the tendons are tensioned in an unbonded state inside the sheath pipe, the tendons are not protected by grout, which can lead to rusting of the tendons in the joint areas of the PCa members. Furthermore, when the building deforms during an earthquake, there is a risk that the tendons will collide with the sheath pipe in the joint areas, causing damage.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a PCa joint member in which PCa members are joined together using unbonded tendons, which can suppress or prevent rusting of the tendons in the joint area between the PCa members and damage caused by the tendons colliding with the sheath tube. [Means for solving the problem]

[0008] In order to achieve the above object, one aspect of the PCa joint member according to the present invention is: A PCa joint member in which PCa members made of precast concrete and having a plurality of sheath pipes are joined to each other while communicating the corresponding sheath pipes to form a communicating sheath pipe, Tendons are inserted into all of the communicating sheath tubes, and the tendons are tensioned in an unbonded state; The tension member is characterized in that a rust preventative material is applied to the joint area spanning the joint interface of at least two of the PCa members.

[0009] According to this aspect, in a PCa joint component in which a tensioning member is tensioned in an unbonded state in a communicating sheath tube formed by the sheath tubes of the PCa components that are joined to each other, a rust-preventive material is applied to the joint area of ​​the tensioning member that spans the joint interface of at least two PCa components, thereby suppressing or preventing rust from occurring in the joint area of ​​the tensioning member.

[0010] Here, the term "joint area spanning the joint interface" refers to an area spanning the joint interface within each of the two PCa members, for example, a range of several centimeters to several tens of centimeters. Furthermore, "applying the anti-corrosion material to the joint area spanning the joint interface of at least two PCa members" refers to applying the anti-corrosion material only to the joint area, as well as to applying it to the entire area of ​​the tendon. Taking into account both the risk of rusting of the tendon in the joint area and cost, it is preferable to apply the anti-corrosion material only to the joint area of ​​the tendon. As described above, the PCa joint member in this embodiment includes a PCaPC joint member, the PCa member includes a PCaPC member, the PCa joint includes a PCaPC column, and the PCa beam includes a PCaPC beam.

[0011] Another aspect of the PCa joint member according to the present invention is A PCa joint member in which PCa members made of precast concrete and having a plurality of sheath pipes are joined to each other while communicating the corresponding sheath pipes to form a communicating sheath pipe, Tendons are inserted into all of the communicating sheath tubes, and the tendons are tensioned in an unbonded state; A viscoelastic material is disposed in the gap between the communicating sheath tube and the tension member in a joint region spanning the joint interface of at least two of the PCa members.

[0012] According to this aspect, in a PCa joint member in which a tendon is tensioned in an unbonded state in a communicating sheath pipe formed by sheath pipes included in PCa members joined to each other, a viscoelastic material is disposed in a joint region of the gap between the communicating sheath pipe and the tendon, the joint region spanning the joint interface of at least two PCa members, thereby suppressing or preventing damage to the tendon due to the tendon colliding with the sheath pipe in the joint region of at least two PCa members. In this aspect, in addition to a form in which the viscoelastic material is disposed only in the joint region, there is also a form in which the viscoelastic material is disposed over the entire area of ​​the tendon, but in addition to the joint region, a viscoelastic material may also be disposed in an extracted region where the tendon deforms significantly when the building deforms.

[0013] Another aspect of the PCa joint member according to the present invention is A PCa joint member in which PCa members made of precast concrete and having a plurality of sheath pipes are joined to each other while communicating the corresponding sheath pipes to form a communicating sheath pipe, Tendons are inserted into all of the communicating sheath tubes, and the tendons are tensioned in an unbonded state; A rust preventative material is applied to a joint region of the tendon that spans the joint interface of at least two of the PCa members, A viscoelastic material is disposed in the gap between the communicating sheath tube and the tension member in a joint region spanning the joint interface of at least two of the PCa members.

[0014] According to this aspect, in a PCa joint member in which a tensioning member is tensioned in an unbonded state in a communicating sheath tube formed by the sheath tubes of the PCa members that are joined to each other, a rust-preventive material is applied to the joint region of the tensioning member that straddles the joint interface of at least two PCa members, and a viscoelastic material is arranged in the joint region of the gap between the communicating sheath tube and the tensioning member that straddles the joint interface of at least two PCa members, thereby suppressing or preventing both rust in the joint region of the tensioning member and damage to the tensioning member due to the tensioning member colliding with the sheath tube.

[0015] Another aspect of the PCa joint member according to the present invention is It is characterized in that it further comprises a stiffener that straddles the joint interface between the two PCa members and surrounds their outer peripheries.

[0016] According to this aspect, by further providing a stiffener that straddles the joint interface and surrounds the periphery thereof, the stiffener can prevent the concrete cover of the PCa member from peeling off in the joint area. Furthermore, by surrounding the periphery of the joint area with the stiffener, it is possible to prevent the outside air, rainwater, etc. from penetrating into the interface, which also makes it possible to suppress rusting of the tendons.

[0017] Another aspect of the PCa joint member according to the present invention is The rust-preventive material is applied to the entire area of ​​the tendon inserted into the communicating sheath tube.

[0018] According to this aspect, since the rust preventive material is applied to the entire area of ​​the tendon, rust development can be suppressed or prevented throughout the entire area of ​​the tendon. Furthermore, when applying the rust preventive material to the tendon, it is not necessary to specify the joint area, for example, and therefore the effort required to specify the joint area can be eliminated.

[0019] Another aspect of the PCa joint member according to the present invention is The viscoelastic material is disposed in gaps throughout the entire area of ​​the communicating sheath tube.

[0020] According to this aspect, since the viscoelastic material is disposed in the gaps throughout the entire communicating sheath tube, damage caused by collision of the tendon throughout the communicating sheath tube can be suppressed or prevented. Furthermore, since it is not necessary to extract the region where the tendon deforms significantly when the building deforms, in addition to the joint region, and then to install the viscoelastic material in this region, the effort required for this extraction can be eliminated.

[0021] In another embodiment of the PCa joint member according to the present invention, The PCa members joined to each other are characterized by being PCa columns.

[0022] According to this aspect, since all of the PCa members joined to each other are PCa columns, damage caused by rusting of the tendons and / or collision of the tendons with the sheath tube can be suppressed or prevented at least in the joint area of ​​the vertically continuous PCa columns.

[0023] In another embodiment of the PCa joint member according to the present invention, The PCa members that are joined to each other are characterized by being PCa columns and PCa joints.

[0024] According to this aspect, since the PCa members joined to each other are a PCa column and a PCa joint, damage caused by rusting of the tendon and / or collision of the tendon with the sheath tube can be suppressed or prevented at least in the joint area of ​​the column-beam joint.

[0025] In another embodiment of the PCa joint member according to the present invention, The PCa members joined to each other are characterized by being PCa beams and PCa beams.

[0026] According to this aspect, since all of the PCa members joined to each other are PCa beams, damage caused by rusting of the tendons and / or collision of the tendons with the sheath tube can be suppressed or prevented at least in the joint area of ​​the laterally continuous PCa beams. [Effects of the Invention]

[0027] As can be understood from the above explanation, according to the PCa joint member of the present invention, in a PCa joint member in which PCa members are connected to each other by unbonded tendons, rusting of the tendons in the joint area between the PCa members and damage caused by the tendons colliding with the sheath tube can be suppressed or prevented. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 2 is a longitudinal cross-sectional view of an example of a PCa joint member according to the first embodiment, showing an enlarged view of the periphery of the joint region of PCa columns joined to each other. [Figure 2] FIG. 2 is a view taken along the line II-II in FIG. [Figure 3] FIG. 10 is a longitudinal cross-sectional view of an example of a PCa joint member according to a second embodiment, showing an enlarged view of the periphery of the joint region of PCa columns joined to each other. [Figure 4] FIG. 10 is a longitudinal cross-sectional view of an example of a PCa joint member according to a third embodiment, showing an enlarged view of the periphery of the joint region of PCa columns joined to each other. [Figure 5]FIG. 10 is a longitudinal cross-sectional view of an example of a PCa joint member according to the fourth embodiment, showing an enlarged view of the periphery of the joint region of PCa columns joined to each other. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, an example of a PCa joint member according to each embodiment will be described with reference to the accompanying drawings. Note that in this specification and drawings, substantially identical components may be designated by the same reference numerals to avoid redundant description.

[0030] [PCa joint member according to the first embodiment] First, an example of a PCa joint member according to the first embodiment will be described with reference to Figures 1 and 2. Here, Figure 1 is a vertical cross-sectional view of an example of a PCa joint member according to the first embodiment, and is an enlarged view of the periphery of the joint region of PCa columns joined to each other, and Figure 2 is a view taken along the arrows II-II in Figure 1.

[0031] A PCa joint member (PCaPC joint member) 100 is formed by joining a PCa column (PCaPC column) 10 (an example of a PCa member (PCaPC member)) of a lower floor to a PCa column (PCaPC column) 20 (an example of a PCa member (PCaPC member)) of an upper floor. Although not shown here, in addition to the illustrated example, PCa joint members also include joint members between PCa columns (PCaPC columns) and PCa joints (PCaPC joints) and joint members between PCa beams (PCaPC beams), and these various PCa joint members form a hybrid frame structure that makes up a multi-story building.

[0032] Here, the "hybrid frame" refers to a structure that includes PCa columns 10, 20, which are precast RC (Reinforced Concrete) columns, PCa joints (not shown), which are also precast RC joints, and steel beams (not shown) that connect the PCa joints. More specifically, the PCa joints can be said to be SRC (Steel Reinforced Concrete) structures, incorporating brackets that form part of the steel beams.

[0033] The PCa column 10 on the lower floor has a rectangular parallelepiped PCa concrete body 11, with multiple (ten in the illustrated example) sheath pipes 16 buried inside, and unbonded PC steel members 17 (an example of a tendon) inserted into each sheath pipe 16. Here, the unbonded PC steel members 17 are PC steel bars, but they may also be PC steel wires or the like. Although not shown, the PCa column 10 has multiple column main reinforcements extending in the vertical direction, and multiple rectangular frame-shaped hoops surrounding the outer periphery of each column main reinforcement.

[0034] The unbonded PC steel 17 protrudes upward from the upper end 12 of the PCa concrete body 11, and by tightening the nut 19 while it is in a tensioned state, the anchoring plate 18 is fixed to the upper end 12 of the PCa concrete body 11, and the tensioned state of the unbonded PC steel 17 is maintained.

[0035] The gap G inside the sheath pipe 16 is not filled with grout, and therefore the unbonded PC steel member 17 is literally in an unbonded state inside the sheath pipe 16.

[0036] On the other hand, the PCa column 20 on the upper floor has a rectangular parallelepiped PCa concrete body 21, and a plurality of sheath pipes 26 (ten in the illustrated example) are buried inside the PCa concrete body 21 at positions corresponding to each sheath pipe 16, and an unbonded PC steel member 27 (an example of a tendon) is inserted into each sheath pipe 26. Here, the unbonded PC steel member 27 is a PC steel rod. Here, the number of unbonded PC steel members 17, 27 is not limited to that in the illustrated example.

[0037] The upper end of unbonded PC tendon 17 and the lower end of unbonded PC tendon 27 are connected to each other via a mechanical joint 35 such as a coupler. In addition, the sheath tubes 16 and 26 are connected vertically to form a communicating sheath tube 30, and the connected unbonded PC tendons 17 and 27 are inserted into the communicating sheath tube 30.

[0038] Here, below the upper sheath tube 26 is an expanded sheath tube 26A with an expanded diameter, and a mechanical joint 35 is accommodated inside this expanded sheath tube 26A.

[0039] Although not shown in the figures, the unbonded PC steel 27 protrudes upward from the upper end of the PCa concrete body 21, and by tightening the nuts in a tensioned state, the anchoring plate is fixed to the upper end of the PCa concrete body 21, thereby maintaining the tension of the unbonded PC steel 27. The sheath pipe 26 is also not filled with grout, and therefore the unbonded PC steel 27 is literally in an unbonded state inside the sheath pipe 26.

[0040] In this way, the unbonded PC steel members 17, 27 on each floor are fixed to the upper ends of the corresponding PCa concrete bodies 11, 21 via anchoring plates.

[0041] A curing member 37 is installed around the fixing plate 18 at the upper end 12 of the PCa concrete body 11, surrounding the unbonded PC steel 17 protruding upward, so that the joint material 40 poured into the joint space 41 between the upper end 12 of the PCa column 10 and the lower end 22 of the PCa column 20 does not enter the upper and lower sheath pipes 26, 16.

[0042] Here, for example, a bellows joint is used as the curing member 37, and grout such as mortar is used as the joint material.

[0043] Of the unbonded PC steel members 17, 27, a rust-preventive material 50 is applied to a joint area A that spans the joint interface 80 of the two PCa columns 10, 20. In the illustrated example, the rust-preventive material 50 is also applied around the fixing plate 18, nut 19, and mechanical joint 35, but the rust-preventive material 50 may be applied only to the joint area A of the unbonded PC steel members 17, 27.

[0044] Here, the joint area A is an area, for example, several centimeters to several tens of centimeters, inside each of the PCa columns 10, 20, spanning the joint interface 80. This range is set to a range in which rust is expected to occur in the unbonded PC steel members 17, 27, depending on the location environment of the building, etc.

[0045] Although not shown in the drawings, a rust preventive material 50 may be applied to the entire area of ​​the unbonded PC steel members 17, 27.

[0046] Hot-dip galvanization, organic zinc-rich paint, resin-based rust preventive materials such as epoxy resin, and the like are applied as the rust preventive material 50. When hot-dip galvanization is applied to the rust preventive material 50, for example, the tendon is usually immersed in a zinc bath to apply the plating, but in this specification, such immersion and spray painting are also considered to be included in the term "application."

[0047] According to the PCa joint member 100, the unbonded PC steel members 17, 27 inserted into the sheath pipes 16, 26 of the PCa columns 10, 20, respectively, are connected via a mechanical joint 35, and both unbonded PC steel members 17, 27 are tensioned, thereby eliminating the need for a longer construction period due to filling the sheath pipes 16, 26 with grout.

[0048] Furthermore, by applying anti-rust material 50 to the joint area A of the unbonded PC steel members 17, 27 that spans the joint interface 80 of at least two PCa columns 10, 20, rusting in the joint area A of the unbonded PC steel members 17, 27 can be suppressed or prevented.

[0049] [PCa joint member according to the second embodiment] Next, an example of a PCa joint member according to the second embodiment will be described with reference to Fig. 3. Here, Fig. 3 is a longitudinal cross-sectional view of an example of a PCa joint member according to the second embodiment, and is an enlarged view of the periphery of the joint region of PCa columns joined to each other.

[0050] The PCa joint member 100A differs from the PCa joint member 100 in that, instead of the anti-rust material 50 being applied to the joint area A of the unbonded PC steel members 17, 27, a viscoelastic material 60 is arranged within the range of the joint area A of the gap G between the communicating sheath tube 30 and the unbonded PC steel members 17, 27.

[0051] Although not shown in the drawings, a viscoelastic material 60 may be disposed in the gap G over the entire area of ​​the communicating sheath tube 30 .

[0052] The viscoelastic material 60 may be a viscoelastic liquid, semi-solid, or solid resin material such as rubber, as well as gum tape (registered trademark) or cellophane tape (registered trademark).

[0053] According to the PCa joint member 100A, a viscoelastic material 60 is arranged in the joint area A of the gap G between the communicating sheath tube 30 and the unbonded PC steel members 17, 27, which spans the joint interface 80 of at least two PCa columns 10, 20, thereby suppressing or preventing damage to the unbonded PC steel members 17, 27 due to the unbonded PC steel members 17, 27 colliding with the sheath tubes 16, 26 in the joint area A of the at least two PCa members.

[0054] [PCa joint member according to the third embodiment] Next, an example of a PCa joint member according to the third embodiment will be described with reference to Fig. 4. Here, Fig. 4 is a longitudinal cross-sectional view of an example of a PCa joint member according to the third embodiment, and is an enlarged view of the periphery of the joint region of PCa columns joined to each other.

[0055] The PCa joint member 100B differs from the PCa joint members 100 and 100A in that an anti-rust material 50 is applied to the joint area A of the unbonded PC steel members 17 and 27, and further, a viscoelastic material 60 is arranged within the range of the joint area A in the gap G between the communicating sheath tube 30 and the unbonded PC steel members 17 and 27.

[0056] According to the PCa joint member 100B, a rust-preventive material 50 is applied to the joint area A of the unbonded PC steel members 17, 27, and a viscoelastic material 60 is further disposed in the joint area A of the gap G between the communicating sheath tube 30 and the unbonded PC steel members 17, 27, thereby suppressing or preventing both rusting in the joint area A of the unbonded PC steel members 17, 27 and damage to the unbonded PC steel members 17, 27 due to collision with the sheath tubes 16, 26.

[0057] [PCa joint member according to the fourth embodiment] Next, an example of a PCa joint member according to the fourth embodiment will be described with reference to Fig. 5. Here, Fig. 5 is a longitudinal cross-sectional view of an example of a PCa joint member according to the fourth embodiment, and is an enlarged view of the periphery of the joint region of PCa columns joined to each other.

[0058] The PCa joint member 100C, compared to the PCa joint member 100B, further includes a stiffener 70 that straddles the joint interface 80 of the PCa columns 10, 20 and surrounds their outer peripheries (side surfaces 13, 23). Here, instead of the PCa joint member 100B, the PCa joint members 100, 100A may also be provided with a stiffener 70.

[0059] The stiffener 70 is fixed to the PCa columns 10, 20 by bolts 75.

[0060] The stiffener 70 shown in the figure is a steel plate or a carbon fiber sheet, but other frame structures made of multiple shaped steel members, steel pipes, square pipes, etc. may also be used.

[0061] The PCa joint member 100C can suppress rusting and breakage in the joint area A of the unbonded PCa tendons 17, 27, and also can prevent peeling of the concrete covering the PCa columns 10, 20 by surrounding the outer periphery of the PCa columns 10, 20 in the joint area A with the stiffener 70. Furthermore, the stiffener 70 can prevent outside air, rainwater, etc. from penetrating the joint interface 80, which also makes it possible to suppress rusting of the unbonded PCa tendons 17, 27.

[0062] The present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0063] 10: PCa columns (lower floor PCa columns, PCa components, PCaPC columns) 11: PCa concrete body 12:Top edge 13: Side 16: Sheath tube 17: Unbonded PC steel (tension member) 18: Fixing plate 19: Nut 20: PCa columns (upper floor PCa columns, PCa components, PCaPC columns) 21: PCa concrete body 22: Bottom edge 23: Side 26: Sheath tube 26A: Widened sheath tube 27: Unbonded PC steel (tension member) 30: Connecting sheath tube 35: Mechanical coupling 37: Curing material (accordion joint) 40: Joint material 41: Joint space 50: Rust prevention material 60: Viscoelastic material 70: Stiffener (steel plate) 75: Bolt 80: Bonding interface 100, 100A, 100B, 100C: PCa joint material (PCaPC joint material) A: Joint area G: Gap

Claims

1. A PCa joint member in which PCa members made of precast concrete and having a plurality of sheath pipes are joined to each other while communicating the corresponding sheath pipes to form a communicating sheath pipe, Tendons are inserted into all of the communicating sheath tubes, and the tendons are tensioned in an unbonded state via mechanical joints having a predetermined length in the extension direction of the tendons; A PCa joint member characterized in that a rust-preventive material is applied to a joint region of the tendon that spans the joint interface between the two PCa members and has a predetermined length that is longer than the predetermined length in the extension direction of the tendon.

2. A PCa joint member in which PCa members made of precast concrete and having a plurality of sheath pipes are joined to each other while communicating the corresponding sheath pipes to form a communicating sheath pipe, Tendons are inserted into all of the communicating sheath tubes, and the tendons are tensioned in an unbonded state via mechanical joints having a predetermined length in the extension direction of the tendons; A PCa joint member characterized in that a viscoelastic material is arranged in a joint region of the gap between the communicating sheath tube and the tension member that spans the joint interface of the two PCa members and has a predetermined length that is longer than the predetermined length in the extension direction of the tension member.

3. A PCa joint member in which PCa members made of precast concrete and having a plurality of sheath pipes are joined to each other while communicating the corresponding sheath pipes to form a communicating sheath pipe, Tendons are inserted into all of the communicating sheath tubes, and the tendons are tensioned in an unbonded state via mechanical joints having a predetermined length in the extension direction of the tendons; a rust preventative material is applied to a joint region of the tendon that spans the joint interface between the two PCa members and has a predetermined length that is longer than the predetermined length in the extension direction of the tendon; A PCa joint member, characterized in that a viscoelastic material is arranged in the joint region of the gap between the communicating sheath tube and the tension member, spanning the joint interface between the two PCa members.

4. The PCa joint member according to any one of claims 1 to 3, further comprising a stiffener spanning the joint interface between the two PCa members and surrounding their outer peripheries.

5. A PCa joint member described in any one of claims 1, 3, and claim 4 dependent on claims 1 and 3, characterized in that the anti-corrosion material is applied to the entire area of ​​the tension member inserted into the communicating sheath tube.

6. The PCa joint member according to any one of claims 2, 3 and claim 4 depending on claims 2 and 3, characterized in that the viscoelastic material is disposed in gaps throughout the entire area of ​​the communicating sheath tube.

7. The PCa joint member according to any one of claims 1 to 6, characterized in that the PCa members to be joined together are PCa columns.

8. The PCa joint member according to any one of claims 1 to 6, characterized in that the PCa members to be joined to each other are a PCa column and a PCa joint.

9. The PCa joint member according to any one of claims 1 to 6, characterized in that the PCa members to be joined together are PCa beams.

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