JP3418681B2 - Installation method of ultra mild steel panel damper in precast RC building structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is set in the case of applying to absorb vibration energy that acts on the construction building at the time of earthquake, a very mild steel panel damper for suppressing the vibration of the building in precast RC building structures 置方 Concerning the law.

[0002]

2. Description of the Related Art Conventionally, many seismic damping devices such as an elasto-plastic damper, a viscous damper and a viscoelastic damper have been developed and put into practical use as a damping device for absorbing vibrational energy acting on a building during an earthquake. There is. These damping devices have a high damping effect when applied mainly to steel-framed buildings that have low rigidity and large deformation during earthquakes, and are extremely rarely applied to RC buildings with high rigidity and small deformation. It was as it was.

However, in recent years, with the advent of a vibration control damper that incorporates an extremely mild steel panel, which has a lower strength and a higher ductility than conventional mild steel, as a damper, it becomes possible to effectively absorb vibration energy even with a small deformation. The number of applications for RC buildings, as well as steel buildings, is increasing.

The installation structure of the ultra-soft steel panel damper for each building structure will be outlined in order. First, as shown in FIG. 12, the installation structure of the steel frame structure is such that the main beam 50 on the upper floor and the main beam on the lower floor are installed. Brackets 50a, 51a are provided from the beam 51 toward the other side, and a damper connecting pillar member 52 is provided for each of the brackets 50a, 51a.
A and 52B are joined together by high-strength bolts, and a very mild steel panel damper 53 is interposed and fixed between the pillar members 52A and 52B for connecting dampers.

Next, the installation structure in the RC building is
It is roughly classified into a stud type shown in FIG. 13 and a wall type shown in FIG. The former stud type is RC on the upper and lower floors.
Hanging wall 56 and waist wall 5 integrated from beams 54 and 55
7 is provided respectively, and a very soft steel panel damper 60 is fixed between the hanging wall 56 and the waist wall 57. When fixing the extremely soft steel panel damper 60, the lower surface of the hanging wall 56 and the waist wall 57 are fixed. Mounting steel plate 5 on top of
8 and 58 are installed, and embedded anchors 59, 59 ... Are embedded inside the body.

Next, the latter wall type is the lower part of the upper girder 61,
At the upper part of the lower floor beam 62 and the side surfaces of the columns 63, 64, mounting frames 66, 66 ... Integrally provided with stud bolts 65, 65 ... Embedded in the body on the back side are provided, and the mounting frames 66, 66. It is a structure in which the ultra-soft steel panel damper 67 is fixed via.

[0007]

In the case of the extremely mild steel panel damper installation structure in the steel frame structure, the extremely mild steel panel damper can be mounted extremely easily.
In the case of an RC building, various problems have occurred when installing the ultra-soft steel panel damper.

First, in the case of the stud type, since the hanging wall 56 and the waist wall 57 are to be cast on site, additional work such as bar arrangement work and formwork installation work occurs on site. In addition to the labor and time required for the work, the construction work for the waist wall 57 cannot be performed at the same time as the concrete laying of the floor slab with the opening on the upper surface side. Since this is a new work, it has been a factor in prolonging the construction period. In addition, the structure must be made considering that the installation accuracy of the embedded anchor is not ensured. Furthermore, as shown in FIG. 14, the embedded anchors 59, 59 ... Are installed inside the bar arrangement due to the structure. As a result, the cross-sectional dimension of the hanging wall 56 and the waist wall 57 (about 300 to 400 mm) becomes larger than the wall thickness (about 200 mm), and it projects toward the indoor side. There were problems such as reduction and restrictions on furniture layout.

On the other hand, in the case of the wall type, the number of joining materials such as stud bolts is large, which requires a great deal of labor and time to install the mounting frame, and the workability is deteriorated because the work is performed on site. High cost. Further, since the opening cannot be provided, it cannot be applied to a place that requires an opening as an entrance or a passage, and there is a problem that the floor plan in the building is greatly restricted.

As described above, regardless of the stud type or the wall type, the application structure to RC building is not developed for the construction work mainly composed of precast members, and basically, it is basically cast on site. Since it was carried out by construction work, there was a situation where it could not be expected to improve the efficiency of construction work.

Therefore, the main object of the present invention is to apply it to a building mainly composed of precast members, and overcomes the above-mentioned problems all at once, and is comparable to the installation structure of the ultra-soft steel panel damper for a steel building. and to provide a construction property and setting 置方 method poles mild steel panels damper in precast RC building structures capable of realizing a structure resistant.

[0012]

The first installation method of the ultra-soft steel panel damper for solving the above-mentioned problems is that the precast beams of the left and right pairs are connected only by the reinforcing bars without concrete in the central portion of the precast beams, In a construction method using a two-divided precast beam that is bridged over the reinforcing bar connecting portion as a column upper position and is joined at an intermediate position of the beam, the upper end side of the steel material for floor joining which projects from the lower floor slab is used. A first step process of joining the panel damper pillar steel material to the mouth in a standing state and joining the upper floor side floor joining steel material to the upper part of the panel damper pillar steel material,
The second step process of installing the two-divided precast beams on both sides of the panel damper pillar steel material and the upper floor side inter-floor joining steel material position, and arranging in a range including the periphery of the upper floor side inter-floor joining steel material After that, set the formwork,
While continuing the ultra-mild steel panel damper sequentially in the upper floor direction by repeating the third step process including the periphery of the steel material for joining floors on the upper floor side and performing concrete placing so as to join the two-divided precast beams It is characterized by being built.

The second installation method is a construction method using a precast beam which is bridged between columns and joined at the upper position of the column, in which a joint for joining the upper and lower ends to the intermediate position of the beam in advance. The first step process of bridging the precast beams in which the inter-floor joining steel materials are embedded in a state where they are projected to the outside, respectively, and joining the inter-floor joining steel materials of the lower floor side precast beams in an upright state. The second upper end of the panel damper pillar steel material is joined to the lower end joint of the inter-floor joining steel material embedded in the bridged precast beam.
By repeating the step process and the third step process of joining the panel damper column steel material to the upper end side joint of the inter-floor joining steel material of the bridged precast beams in the standing state, the ultra-soft steel panel damper is sequentially installed in the upper floor direction. It is characterized by building continuously.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view showing an installation structure of an extremely soft steel panel damper in a precast RC building structure according to the present invention, and FIG. 2 is a II- of FIG.
II line arrow view, FIG. 3 is a III-III line arrow view of FIG.

In the installation structure of the ultra-soft steel panel damper shown in FIG. 1, the floor 1 of each floor is composed of precast beams 2, half precast slabs 3 and cast-in-place concrete 7, as shown in FIG. In the precast RC building structure, the floor-to-floor 1 of each floor is penetrated, and steel members 4 for joining floors having bolt joints are provided at upper and lower ends, respectively, and the steel is relatively installed on the upper floor and the lower floor. This is a structure in which a panel damper column steel material 5 is connected and fixed between floor-to-floor joining steel materials 4 and 4.

The inter-floor joining steel material 4 is, as shown in detail in FIG. 4, a base steel material 10 made of a die material having a substantially H-shaped cross section.
As above, the upper end plate 11A is fixed to the upper surface at the position flush with the upper surface of the floor 1, and the lower end plate 11B is fixed to the lower surface at the position flush with the lower surface of the precast beam 2. Further, outside the flange of the base steel material 10, extended end plates 12A, 12B, 1 that substantially extend the upper and lower end plates 11A, 11B.
3A, 13B and extended web plates 14A, 14B
It is a processed steel material with a fixed structure. Further, bolt through holes 10a, 10a ... Are formed at the upper and lower ends of the flange of the base steel material 10 and the web, respectively, and the joining port 4 is formed.
a and 4b.

The extended end plates 12A, 12B,
13A, 13B and extended web plates 14A, 14
B is for increasing the shear strength of the steel material 4 for joining floors to the precast beam 2. That is,
In the case where a mold material having an H-shaped cross section is simply used as the inter-floor joining steel material 4, stress concentration may occur in the concrete at the contact portion when the acting force acting at the time of an earthquake is excessive, and thus the concrete may be destroyed. Extended end plates 12A, 12
B, 13A, 13B and extended web plate 14A,
14B is designed to increase the contact area with concrete to increase the bearing resistance against horizontal force during an earthquake.

On the other hand, the panel damper pillar steel material 5 has a cross section H.
It is a panel damper member having a structure in which an extremely soft steel panel 6 is fitted in an intermediate web portion of a shaped mold material, and bolt holes are formed in upper and lower end webs and flanges for bolting the steel material 4 for floor bonding, respectively. The joints 5a and 5b for joining are formed.

The construction method for installing the ultra-soft steel panel damper having the above structure will be described in detail below.

[First Construction Example] This first construction example is a building structure using a so-called two-piece precast beam in which the precast beam does not have concrete in the central portion and the pair of left and right precast beams are connected only by reinforcing bars. It is a construction example in the case of.

In the two-divided precast beam, the center portion of the precast beam is made of only rebar in order to avoid joining or fixing at the column-beam joint where the column rebar or the beam of the precast beam in the intersecting direction is converging. The rebar connecting part is installed so as to be located at the beam-column joint, and the precast beams are joined to each other in the middle of the beams.

The construction procedure will be described below with reference to FIGS. The description will be made from a state in which the extremely mild steel panel damper device on the lower floor side is relatively assembled and the upper end side joint of the floor-to-floor joining steel material 4 projects from the upper surface of the floor 1.

In advance, the panel damper pillar steel material 5 and the floor joining steel material 4 are joined by bolts,
It is built into the upper end joint of the steel material 4 for floor bonding which is buried in the lower floor side. At the time of this installation, the bolts are not tightened permanently, but are temporarily tightened in order to release the stress by removing the bolts later. The panel damper pillar steel material 5 and the inter-floor joining steel material 4 may be joined in advance as described above, or the panel may be first attached to the upper end joint of the lower floor-side inter-floor joining steel material 4. After joining the damper pillar steel material 5, the inter-floor joining steel material 4 may be subsequently joined.

Further, as shown in FIG. 8, a through hole for a shear reinforcing bar is formed on the web in the inter-floor joining steel material 4, and a shearing force such as a stirrup is passed through the through hole. Reinforcing bars 20, 20 ... Are attached in advance.

Next, as shown in FIG. 6, the beam supporting columns 15 and 15 are straddled over the positions of the steel members 4 for joining floors on both sides thereof.
And the two-part precast beams 16 and 16 are installed while being supported by the beam support column 15 and the column 19. When lifting the two-divided precast beams 16, the wires 18, 1 hung from the suspension balance 17 are used.
8 to hang the precast beams on both sides separately.

When the work up to this point is completed, as shown in FIG. 7, the half precast slab 3 is bridged between the precast beams 16 and 16 and the slab rebar 21, 21 are arranged, and a main bar 22 connecting the precast beams 16 is further installed by, for example, enclosed welding. Note that FIG. 8 is a plan view showing a state in which the reinforcement has been finished between the precast beams 16 and 16.

When a frame is assembled around the inter-floor joining steel material 4 and the preparation for placing concrete is completed, concrete is poured around the inter-floor joining steel material 4 and the upper surface portion of the half precast slab 3. The two-divided precast beams 16 and 16 are joined together, and the half precast slabs 3 and 3 are joined together.

After that, when the concrete is hardened, the temporary bolts at the lower end of the panel damper column steel material 5 are once removed to release the stress, and then the bolts are inserted and fully tightened to make the ultra soft steel panel for the floor. Complete the installation of the damper. This construction work will be performed sequentially with the ultra-mild steel panel damper in the upper floor direction at each stage of floor construction as the construction progresses.

In the above example, the half precast slab 3 was used for the construction of the slab, but the entire slab may be finished by on-site casting construction.

[Second Construction Example] Next, a second construction example shown in FIGS. 9 and 10 is a construction example in which the precast beams 23, 23 are joined at the column upper position.

As shown in FIG. 9, the precast beam 2
3, the joints 4a, 4 for joining the upper and lower end portions at the time of manufacturing
The floor-to-floor joining steel materials 4 are embedded in the state where each b is projected to the outside, and when this precast beam 23 is carried to the installation site, it is bridged between the predetermined pillars and the floor of the lower floor side precast beam 23. Panel damper column steel material 5 already installed in the standing steel material 4 for inter-joint connection at the upper end side 5a
And the lower end side joint 4b of the inter-floor joining steel material 4 embedded in the bridged precast beam 23 are bolted to each other.

Then, as shown in FIG. 10, the upper end side joint 4a of the inter-floor joining steel material 4 and the lower end side joint 5b of the panel damper column steel material 5 embedded in the bridged precast beam 23 are bolted. It joins and the said panel damper pillar steel material 5 is built. By this installation procedure, the ultra-mild steel panel dampers are successively installed in the upper direction.

The installation structure and installation method of the ultra-soft steel panel dampers in the precast RC building structure have been described above in detail. As shown in FIG. 11, the ultra-soft steel panel dampers are arranged in a row in the lateral direction (illustrated example). May have a double structure).

[0034]

As described above in detail, according to the present invention, the application of the extremely soft steel panel damper to a building mainly composed of a precast member can be performed in a construction comparable to the installation structure of the extremely soft steel panel damper for a steel building. It is possible to realize the property and the structure.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an installation structure of an extremely soft steel panel damper in a precast RC building structure according to the present invention.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a perspective view of a steel material 4 for joining floors.

FIG. 5 is a construction procedure diagram (1) of the first construction example.

FIG. 6 is a construction procedure diagram (No. 2) of the first construction example.

FIG. 7 is a construction procedure diagram (No. 3) of the first construction example.

FIG. 8 is a plan view showing a state where reinforcement of a precast beam joint is completed.

FIG. 9 is a construction procedure diagram (1) of a second construction example.

FIG. 10 is a construction procedure diagram (2) of a second construction example.

FIG. 11 is a vertical cross-sectional view in the case where the extra soft steel panel damper has a double structure.

FIG. 12 is an installation structure diagram of a very soft steel panel damper in a conventional steel structure.

FIG. 13 is an installation structure diagram of a stud type ultra-soft steel panel damper in a conventional RC structure.

14 is a view taken along line XIV-XIV in FIG.

FIG. 15 is an installation structure diagram of a wall type extremely soft steel panel damper in a conventional RC structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Floor, 2 ... Precast beam, 3 ... Half precast slab, 4 ... Inter-floor joining steel material, 5 ... Panel damper pillar steel material, 10 ... Base steel material, 11A ... Upper end plate, 11B ... Lower end plate, 12A-13B ... Expanded end plate, 14A / 14B ... Expanded web plate, 16 ... Two-piece precast beam, 23 ... Precast beam, 20 ... Shear reinforcement

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-11-270178 (JP, A) JP-A-2000-291289 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04H 9/02 301,321 E04B 2/56 643

Claims (2)

(57) [Claims] 1. A precast beam having no concrete in the central portion of the precast beam, and a pair of left and right precast beams are connected only by reinforcing bars, and the reinforcing bar connecting portion is bridged as a column upper position and joined at an intermediate position of the beam. In the construction method using two-division precast beams, the panel damper column steel members are joined upright to the upper end side joint of the steel members for floor bonding that protrudes from the lower floor slab, and the panel damper column steel members A first step step of joining upper floor side inter-floor joining steel materials to the upper part, and a second step step of installing the two-divided precast beams on both sides straddling the panel damper column steel material and upper floor side inter-floor joining steel material positions And, after arranging in a range including the periphery of the steel material for joining floors on the upper floor side, installing a formwork, and including the periphery of the steel material for joining floors on the upper floor side and before. In the precast RC building structure, which is characterized in that the third step process of placing concrete so as to join the two-divided precast beams is repeated, and the ultra-mild steel panel dampers are successively built up in the upper floor direction. Installation method of ultra-soft steel panel damper. 2. In a construction method using a precast beam which is bridged between columns and joined at the upper position of the column, the joining joints at the upper and lower ends are projected to the outside in advance at intermediate positions of the beams. The first step process of bridging the precast beam in which the inter-floor joining steel material is buried between the columns in the above state, and the panel damper column steel material already joined to the inter-floor joining steel material of the lower floor side precast beam in an upright state The upper end side of the
A second step step of joining the inter-floor joining steel material embedded in the bridged precast beams to the bottom end joint, and the panel damper column steel material to the top end joint of the bridged precast beams The method of installing the ultra-soft steel panel damper in the precast RC building structure, characterized in that the ultra-soft steel panel damper is built up continuously in the upward direction by repeating the third step process of joining in the upright state, and successively.