JP2016000913A - Mounting structure and mounting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a seismic isolator to an intermediate layer of a building capable of improving the workability.SOLUTION: The mounting structure for mounting a seismic isolator to an intermediate layer of a building includes: a lower layer side beam-column connection part which is fixed to the seismic isolator; and an upper layer side beam-column connection part which is fixed to the seismic isolator. The lower part of the lower floor side beam-column connection part is constituted of a first pre-cast (PCa) member, and the lower part of the upper floor side beam-column connection part is constituted of a second PCa member. Each of the first and second PCa members includes reinforcing-bars embedded as the reinforcement bars of the beam-column connection part.

Description

  The present invention relates to a technique for attaching a seismic isolation device to an intermediate layer of a building.

  As one of the seismic isolation structures of buildings, a structure with a base isolation device installed on the foundation is known (base isolation). The seismic isolation device is typically configured by providing laminated rubber between upper and lower flange plates. In installing the seismic isolation device, the seismic isolation device is fixed to the foundation using upper and lower flange plates. As a structure of the foundation part to which a seismic isolation device is fixed, the technique which tried to improve workability using PCa (precast) member is proposed (patent documents 1-3).

Japanese Patent No. 5232106 Japanese Patent No. 3803434 JP 2012-67524 A

  As a seismic isolation structure that replaces the basic seismic isolation, middle-layer seismic isolation suitable for seismic isolation of high-rise parts has been proposed. In the middle layer seismic isolation, seismic isolation devices are installed in the middle layer of the building. Specific intervening parts include the upper and lower beam-column joints. However, because work is performed at high places, labor reduction and shortening of the work period are required. In addition to the denseness of the reinforcing bars, the work is likely to be complicated because the seismic isolation device is attached.

  An object of the present invention is to improve the workability in attaching a seismic isolation device to an intermediate layer of a building.

  The present invention relates to a mounting structure for attaching a seismic isolation device to an intermediate layer of a building, a lower column beam joint fixed to the seismic isolation device, and an upper column beam fixed to the seismic isolation device A lower portion of the lower-layer side beam-beam joint portion is constituted by a first PCa member, and a lower portion of the upper-layer side beam-beam joint portion is constituted by a second PCa member, Each of the first and second PCa members is provided with a reinforcing bar constituting a reinforcing bar of the beam-column joint part.

  Further, the present invention is an attachment method for attaching a seismic isolation device to an intermediate layer of a building, comprising a step of constructing a lower-layer-side column beam joint fixed to the seismic isolation device, and the lower-layer-side column beam joint A step of constructing the seismic isolation device on a part; and a step of constructing an upper column beam joint to be fixed to the seismic isolation device on the seismic isolation device. The bottom portion of the joint portion is configured by a first PCa member, the bottom portion of the upper-layer column beam joint portion is configured by a second PCa member, and the first and second PCa members are respectively Reinforcing bars that make up the reinforcing bars of the beam-column joint are planted.

  According to the present invention, when the seismic isolation device is attached to an intermediate layer of a building, its workability can be improved.

Explanatory drawing of the attachment structure which concerns on one Embodiment of this invention. (A) And (B) is explanatory drawing of a PCa member. (A) And (B) is explanatory drawing of the attachment construction method which concerns on one Embodiment of this invention. (A) And (B) is explanatory drawing of the attachment construction method which concerns on one Embodiment of this invention. (A) And (B) is explanatory drawing of the attachment construction method which concerns on one Embodiment of this invention. (A) And (B) is explanatory drawing of the attachment construction method which concerns on one Embodiment of this invention.

  FIG. 1 is an explanatory view of a mounting structure 1 according to an embodiment of the present invention. FIG. 1 illustrates a main configuration of the mounting structure 1 for convenience of explanation, and a detailed configuration (for example, bar arrangement) is not illustrated.

  The attachment structure 1 is a structure in which the seismic isolation device 2 is attached to an intermediate layer of an RC or SRC building. In the case of the example in FIG. 1, the seismic isolation device 2 is attached to the N floor portion. By providing the seismic isolation device 2, the response shear force at the level of the (N + 1) th floor and higher is reduced, and the response shear force is also reduced at the level of the (N−1) th floor and below because the high-level portion is less likely to be shaken. Decrease. The N floor is, for example, a hierarchy of about 10 floors, the lower layer side is, for example, a commercial facility, and the upper layer side is, for example, a residential part.

  The seismic isolation device 2 is interposed between the beam-beam joint 3 on the lower layer side (N−1 floor) and the beam-beam joint 4 on the upper layer side (N + 1 floor). The seismic isolation device 2 includes a lower flange plate 21, an upper flange plate 22, and a laminated rubber 23 provided between the flange plates 21 and 22. The column beam joint 3 is fastened to the flange plate 21 with bolts b and fixed to the seismic isolation device 2. The column beam joint 4 is fastened to the flange plate 22 with bolts b and fixed to the seismic isolation device 2.

  The column beam joint 3 has a rectangular parallelepiped shape, and the column 5 on the lower layer side and beams 6 and 6 are connected to the column beam joint 3. In the example of FIG. 1, a configuration in which the beams 6 and 6 are connected to the left and right of the column beam joint 3 is illustrated, but the connection mode of the beams is not limited to this, and is a cross shape and a T shape in a plan view. The structure connected so that it may cross | intersect a type | mold or an L-shape is also employable.

  The column 5 includes a plurality of column main bars 51 extending in the vertical direction, and the upper end portion thereof is embedded and fixed in the column beam joint 3. The beams 6, 6 include a plurality of beam main bars 62 extending in the left-right direction, and the left and right beam main bars 62, 62 are connected to each other in the column beam joint 3. A plurality of ribs 63 are arranged around the beam main bar 62. A part of the beam 6 is composed of a PCa member 61, and the remaining concrete part is made on-site. It is also possible to configure the entire beam 6 with a PCa member. A slab (not shown) is integrally formed on the upper portion of the beam 6.

  The column beam joint 4 has a rectangular parallelepiped shape, and the column 9 on the upper layer side and the beams 7 and 7 are connected to the column beam junction 4. In the example of FIG. 1, a configuration in which the beams 7 and 7 are connected to the left and right of the column-beam joint portion 4 is illustrated, but it is possible to adopt other connection modes as the beam connection mode. It is the same.

  The column 9 includes a plurality of column main reinforcing bars 91 extending in the vertical direction, and is connected to a column main reinforcing bar 91 b extending upward from the column beam joint 4. The column main reinforcing bar 91 b is connected to the column main reinforcing bar 91 a embedded in the column beam connecting portion 4, and the lower end portion of the column main reinforcing bar 91 a is fixed to the column beam connecting portion 4. The beams 7, 7 include a plurality of beam main bars 72 extending in the left-right direction, and the left and right beam main bars 72, 72 are connected to each other within the column beam joint 4. A plurality of ribs 73 are arranged around the beam main bar 72. A part of the beam 7 is composed of a PCa member 71, and the remaining concrete part is made in-situ. It is also possible to configure the entire beam 7 with a PCa member. A slab 8 is integrally formed on the upper portion of the beam 7.

  Next, the column beam joint 3 will be described. The column beam joint portion 3 includes a PCa member 31 constituting the lower portion thereof, a spot casting portion 32 constituting the remaining concrete portion, reinforcing bar groups 33 and 34, a base plate 35, a metal fitting 36, an anchor 37, A gantry 38.

  When the floor height of the N floor portion is large, it takes time to place the bottom concrete of the beam-column joint portion 3 in the field with a formwork. Therefore, the lower part of the column beam joint 3 is constituted by the PCa member 31. The PCa member 31 will be described with reference to FIGS. 1 and 2A.

  FIG. 2A is an explanatory diagram of the structure of the PCa member 31. In the case of this embodiment, the PCa member 31 has a rectangular plate shape, and a hole portion 31a through which the column main reinforcement 51 passes is formed in the central portion thereof. Further, a reinforcing bar group 33 is implanted in the PCa member 31. The reinforcing bar group 33 is formed by a reinforcing bar cage that is driven when the PCa member 31 is manufactured. The reinforcing bar group 33 mainly constitutes a lower reinforcing bar from the central part of the column beam joint 3.

  Referring to FIG. 1, the reinforcing bar group 34 is a reinforcing bar group arranged on site, and constitutes an upper reinforcing bar from the central part of the column beam joint 3. The base plate 35 is disposed on the upper surface of the column beam joint 3 and the seismic isolation device 2 is fixed. A plurality of metal fittings 36 are fixed to the lower surface of the base plate 35. The metal fitting 36 is a cylindrical member having a screw hole, and the anchor 37 is fixed to the base plate 35 via the metal fitting 36. The anchor 37 is a rod-shaped member (for example, a threaded reinforcing bar) having a screw portion fastened to the metal fitting 36 at its upper end, and a fixing portion fixed to the column beam joint 3 at its lower end. (Such as a nut with a hook) is provided.

  The base plate 35 is formed with a through hole communicating with a screw hole of a part of the metal fitting 36. The base plate 35 and the flange plate 21 can be fixed by inserting the bolts b into the through holes and fastening them with the metal fittings 36. The gantry 38 is a table-like member that supports the base plate 35 during construction, and is placed on the PCa member 31 as described later.

  Next, the column beam joint 4 will be described. The column beam joint portion 4 includes a PCa member 41 constituting the lower portion thereof, a spot casting portion 42 constituting the remaining concrete portion, reinforcing bar groups 43 and 44, a base plate 45, a metal fitting 46, an anchor 47, A gantry 38 and column main bars 91a and 91b are included.

  Similar to the beam-column joint 3, when the floor height of the N-th floor portion is large, it takes time to hit the bottom concrete of the beam-column joint 4 with a formwork. Therefore, the lower part of the column beam joint 4 is constituted by a PCa member 41. The PCa member 41 will be described with reference to FIGS. 1 and 2B.

  FIG. 2B is an explanatory diagram of the structure of the PCa member 41. In the case of this embodiment, the PCa member 41 has a rectangular plate shape, and a base plate 45 is embedded in the bottom surface thereof. The PCa member 41 is provided with a reinforcing bar group 43, a plurality of column main bars 91a, and a plurality of anchors 47.

  The reinforcing bar group 43 is formed by a reinforcing bar cage that is driven when the PCa member 41 is manufactured. The reinforcing bar group 43 mainly constitutes a lower reinforcing bar from the central part of the column beam joint 4. The column main reinforcement 91 a is provided with a fixing portion fixed to the PCa member 4 at the lower end thereof, and extends upward from the PCa member 41. In the present embodiment, the column main reinforcement 91a is configured to be connected to the column main reinforcement 91 via the column main reinforcement 91b. However, by increasing the total length of the column main reinforcement 91a, the column main reinforcement 91b is not connected to the column main reinforcement 91b. A connection configuration can also be employed.

  The seismic isolation device 2 is fixed to the base plate 45. A plurality of metal fittings 46 are fixed to the upper surface of the base plate 45. The metal fitting 46 is a cylindrical member having a screw hole, and the anchor 47 is fixed to the base plate 45 through the metal fitting 46. The anchor 47 is a rod-like member (for example, a threaded reinforcing bar) having a screw portion fastened to the metal fitting 46 at the lower end portion, and a fixing portion fixed to the column beam joint portion 4 at the upper end portion. (Such as a nut with a hook) is provided.

  The base plate 45 is formed with a through hole 45 a communicating with the screw holes of some of the metal fittings 46. The base plate 45 and the flange plate 22 are fixed by inserting the bolt b into the through hole 45a and fastening the bolt 46 to the metal fitting 46.

  Referring to FIG. 1, the reinforcing bar group 44 is a reinforcing bar group arranged on site, and constitutes an upper reinforcing bar from the central part of the column beam joint 4.

  Next, an example of a method for attaching the seismic isolation device 2 will be described with reference to FIGS. After the column 5 is constructed, the column beam joint 3 and the beam 6 are constructed. First, as shown in FIG. 3 (A), after the temporary support 10 is temporarily installed, the PCa member 31 constituting the column beam joint 3 is placed on the column 5 so that the column main reinforcement 51 passes through the hole 31a. Arrange. Further, the PCa members 61 and 61 constituting the beam 6 are arranged on the left and right sides of the column beam joint portion 3.

  Subsequently, as shown in FIG. 3B, reinforcing bars such as the reinforcing bar group 34, connection of the left and right beam main bars 62, 62, installation of an omni plate for a slab (not shown), reinforcing bars, and the like are performed. Further, before and after this operation, as shown in FIG. 4A, the base plate 35 and the gantry 38 are arranged. First, the gantry 38 is placed on the PCa member 31. Since the PCa member 31 is plate-shaped, there is an advantage that it is relatively easy to install the gantry 38 on the upper surface and the position accuracy is easily obtained. The gantry 38 can be fixed to the beam main bar 62.

  When the installation of the gantry 38 is completed, the base plate 35 is placed thereon and fixed by an appropriate method. After that, the installation of the formwork and the concrete-laying work of the column beam joint 3, beam 6 and slab are performed.

  In parallel with these operations, as shown in FIG. 4 (B), it is possible to perform pre-assembly such as reinforcement of the column beam joint 4 and the beam 7. In the example of the figure, PCa members 71 and 71 constituting the beam 7 are arranged on the left and right sides of the PCa member 41 constituting the beam-to-column joint 4, reinforcing bars such as the reinforcing bar group 44, left and right beam main bars 72, The case where grounding, such as connection of 72 and the connection of the column main reinforcement 91a and the column main reinforcement 91b, is performed is illustrated. It should be noted that only the constituent parts of the column beam joint 4 are pre-assembled, and at least one of the PCa members 71 and 71 constituting the beam 7 may be assembled on site.

  After curing the cast-in-place concrete such as the beam-column joint 3 or the like, the seismic isolation device 2 is constructed on the beam-column joint 3 as shown in FIG. Here, the flange plate 21 is fixed to the base plate 35 with bolts b. Subsequently, as shown in FIG. 5, the support work 11 is temporarily installed, the pre-assembled unit such as the PCa member 41 is placed on the support work 11 and the seismic isolation device 2, and the PCa member 41 is fixed to the seismic isolation device 2. . Here, the flange plate 22 is fixed to the base plate 45 with bolts b. Thereafter, an omni plate for the slab 8 is installed and the reinforcing bars are arranged. Furthermore, the installation of the formwork and the concrete placement work of the column beam joint 4, beam 7 and slab 8 are performed.

  After curing the cast-in-place concrete such as the beam-to-column joint 3, the installation of the seismic isolation device 2 is completed as shown in FIG. Thereafter, as shown in FIG. 6 (B), the pillar 9 is constructed, and the upper floors are sequentially constructed.

  As described above, in the present embodiment, the lower portions of the column beam joints 3 and 4 are configured by the PCa members 31 and 41. When the seismic isolation device 2 is attached to the intermediate layer as in the present embodiment, it becomes a work at a high place when the floor height increases, so it takes time and effort to place the bottom concrete of the column beam joints 3 and 4 in the field with a formwork. Therefore, in this embodiment, the efficiency and safety | security of work can be improved by making each lower part of the column beam junction parts 3 and 4 into the PCa members 31 and 41. FIG. Of the beam-column joints 3 and 4, the range of the PCa members 31 and 41 can be designed as appropriate, and the wider one can reduce the field work. For example, within the range from the thickness not driving the beam main bar to the lower half Also good.

  In the beam-column joints 3 and 4, the column / beam main bars, the reinforcing bar groups, and the anchors are densely packed and become very mixed. In the present embodiment, the reinforcing bar groups 33 and 43 are implanted in the PCa members 31 and 41. As a result, not only the amount of bar arrangement on site can be reduced, but the reinforcing bar groups 33 and 43 can be arranged at positions where the column / beam main bars and anchors have been displaced, and the bar arrangement with higher accuracy can be achieved. It becomes possible. Thereby, it becomes easy to avoid the interference between the reinforcing bars when performing the on-site bar arrangement, and the workability can be improved.

  By adopting a configuration in which the PCa member 31 is plate-shaped and the gantry 38 is placed on the upper surface thereof, the gantry 38 can be positioned and fixed more reliably, and the positional accuracy of the base plate 35 can be improved. Thereby, the attachment position precision of the seismic isolation apparatus 2 can be improved.

  Since the base plate 45 is embedded in the PCa member 41, the position can be adjusted when the PCa member 41 is produced, and the positional accuracy can be improved. Thereby, the attachment position precision of the seismic isolation apparatus 2 can be improved. Further, since the PCa member 41 has a structure in which the column main bars 91a are implanted, the position thereof can be adjusted when the PCa member 41 is produced, and the position accuracy can be improved.

DESCRIPTION OF SYMBOLS 1 Mounting structure, 2 Seismic isolation device, 3 Beam-column joint part, 4 Beam-column joint part, 31 PCa member, 33 Reinforcement reinforcement group, 41 PCa member, 43 Reinforcement reinforcement group

Claims (4)

A mounting structure for attaching a seismic isolation device to the middle layer of a building,
A lower column beam joint fixed to the seismic isolation device;
A column beam joint on the upper layer side fixed to the seismic isolation device,
The lower part of the lower column side column beam joint is composed of a first PCa member,
The lower part of the upper beam-column joint is composed of a second PCa member,
The first and second PCa members are each provided with a reinforcing bar constituting a reinforcing bar of the beam-column joint part.
A mounting structure characterized by that. The mounting structure according to claim 1,
The first PCa member is a plate-like PCa member provided with a hole through which a lower layer side column main reinforcing bar joined to the lower layer side column beam joint,
The beam-column joint on the lower layer side is
A base plate to which the seismic isolation device is fixed;
A pedestal installed on the first PCa member and supporting a base plate;
A mounting structure characterized by that. The mounting structure according to claim 1 or 2,
The second PCa member is embedded with a column main bar connected to an upper column main bar joined to the upper column beam joint, and a base plate to which the seismic isolation device is fixed is embedded. A plate-like PCa member,
A mounting structure characterized by that. An installation method for attaching seismic isolation devices to the middle layer of a building,
A step of constructing a column beam joint on the lower layer side fixed to the seismic isolation device;
The step of constructing the seismic isolation device on the lower-column-side beam-column joint,
On the seismic isolation device, the step of constructing a column beam joint on the upper layer side fixed to the seismic isolation device,
The bottom of the lower-column-side beam-column joint is composed of a first PCa member,
The bottom of the upper beam-column joint is composed of a second PCa member,
The first and second PCa members are each provided with a reinforcing bar constituting a reinforcing bar of the beam-column joint part.
A mounting method characterized by that.

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