JP4151693B2 - Installation structure of studs in existing building - Google Patents

Description

  The present invention relates to a structure for installing a stud in an existing building suitable for use in adding a pillar damper or the like as an anti-seismic reinforcement to a pillar beam structure of an existing building having a steel frame.

  Occurs when an earthquake occurs in a building that has not been subjected to various seismic or vibration control measures, including existing buildings designed based on the previous seismic design based on the experience of multiple major earthquakes that occurred earlier In order to suppress deformation of a large frame, various construction methods for newly adding earthquake-proof means and vibration control means in the frame surface have been adopted.

  Among them, conventional methods for adding vibration control means to suppress deformation of the frame include, for example, a method of incorporating a steel brace with a hydraulic damper or the like, or a space between the upper and lower floor beams constituting the column beam frame. A method of installing a damper is adopted.

  Here, according to the construction method of installing the stud damper, when the frame is deformed in the horizontal direction in the event of a large earthquake, the damper can absorb the deformation energy and thereby suppress the vibration transmitted to the frame. As in the case where the steel brace is installed, there is an advantage that there is no restriction on the use of the existing building by preventing the traffic in the frame.

FIG. 7 and FIG. 8 show a conventional installation structure when this type of inter-column damper is added to an existing building having a steel-framed column beam frame.
That is, in this existing building, a beam-beam frame is constructed by bridging a beam 2 made of H-shaped steel between steel pipe columns 1, and a floor slab 3 is placed on the upper flange 2a of the beam 2. The intermediate column damper 4 is interposed in the middle portion between the columns 1 in the column beam frame.

  Here, the extended stud damper 4 has a hydraulic damper 5 interposed between the upper stud 4a and the lower stud 4b made of H-shaped steel to attenuate the displacement in the horizontal direction. 5a is integrated with the upper stud 4a and the other end 5b is integrated with the lower stud 4b.

The upper end of the upper inter-column 4a is integrated with the lower flange 2b of the upper beam 2 by welding, and the lower end of the lower inter-column 4b removes the floor slab 3 of the portion. Thus, it is integrated with the upper flange 2b of the lower beam 2 by welding.
Reference numeral 6 in the figure is a reinforcing plate that is extended between the upper and lower flanges 2a, 2b of the beam 2 so as to be continuous with the flange of the stud damper 4, and these reinforcing plates 4 can The strength of the beam 2 is ensured.

In addition, although it is not used for the extension with respect to the existing building and it is not with respect to the existing structure of a steel structure, as an installation structure of the stud damper in a general reinforced concrete structure or a steel reinforced concrete structure building, for example, the following patent document 1 The structure of the studs seen in is known.
JP 2004-225351 A

  By the way, in the conventional installation structure at the time of adding the stud damper 4 to the existing steel-frame building shown in FIG. 7 and FIG. 8, in order to weld the lower stud 4b to the upper flange 2a of the beam 2, It is necessary to remove the floor slab 3. For this reason, there existed a fault that removal of the concrete which comprises the said floor slab 3, the removal of the deck, and also the crack repair etc. which arose in the surrounding slab 3 by these removal operations require much effort.

  Further, in addition to the welding of the lower stud 4b and the upper flange 2a of the beam 2 and the upper stud 4a and the lower flange 2b of the upper beam 2, a number of reinforcing plates are provided between the upper and lower flanges 2a and 2b of each beam 2. Since it is necessary to weld 6, there is a problem that a great amount of labor and construction work period are required for the entire welding work.

In addition, since there are many on-site welds, a wide range of fire prevention measures and curing are required to prevent fires caused by the above welding sparks in already used rooms. there were.
In particular, since the joining of the upper column 4a to the lower flange 2b of the upper beam 2 is an upward welding, there is a drawback that the construction becomes difficult and a problem is easily caused in the welding quality.

  The present invention has been made in view of such circumstances, and it is not necessary to remove an existing slab deck when adding a stud to an existing steel structure building, and the construction is easy and results from welding work. It is an object of the present invention to provide an installation structure of studs in an existing building that can eliminate or reduce incidental work as much as possible.

  In order to solve the above problem, the invention according to claim 1 has a column beam frame in which a steel beam in which an upper flange and a lower flange are integrated by a web is installed between columns, A structure for installing a stud between upper and lower beams of an existing building in which a slab is formed on a beam, wherein a first base plate is integrally provided at the upper and lower ends of the stud, and the first base plate is A plurality of reinforcing members are interposed between the upper and lower flanges of the upper and lower beams positioned, and a second base plate is installed on the slab located above the first base plate on the upper end side of the stud. And a third base plate is installed on the lower surface of the lower flange of the beam located below the first base plate on the lower end side of the stud, and at least the first to third base plates and the upper Holes communicating with each of the slabs in the vertical direction are formed, and at the upper end portions of the studs, tension materials are inserted into the hole portions of the first and second base plates through the hole portions of the slabs. Fixing the intermediate pillars to the first and second base plates by fixing devices, respectively, to fix the studs to the upper beams, and at the lower ends of the studs, the tension members pass through the holes of the slabs to the first and second parts. Inserting into the hole of the third base plate and fixing the upper and lower end portions thereof to the first and third base plates by fixing devices, respectively, thereby fixing the stud to the lower beam. It is.

  According to a second aspect of the present invention, the second base plate according to the first aspect is integrated with the lower end portion of the intermediate column interposed between the upper and lower beams on the upper floor so as to be continuous with the intermediate column. It is characterized by being a base plate.

  Furthermore, the invention according to claim 3 is the upper end portion of the stud, in which the third base plate according to claim 1 or 2 is interposed between the upper and lower beams on the lower floor so as to be continuous with the above-described stud. The base plate is integrated with the base plate.

  According to the first aspect of the present invention, the upper beam and the slab are sandwiched between the first base plate of the stud and the second base plate installed on the upper slab at the upper end of the stud, By inserting a tension material into the first and second base plates and holes formed in the slab and fixing them to the first and second base plates with a fixing tool, the upper ends of the studs are fixed to the upper beam. can do.

  On the other hand, at the lower end of the stud, the slab and the lower beam are sandwiched between the first base plate of the stud and the third base plate installed on the lower surface of the lower flange of the lower beam. Fixing the lower end of the stud to the lower beam by inserting a tension material into the hole formed in the third base plate and the slab and fixing it to the first and third base plates with a fixing tool. Can do.

  Here, in the case where the same pillar is not continuous above (upper floor) or below (lower floor), like the pillars installed on the uppermost floor or the lowermost floor, the second base plate or As the third base plate, a flat plate-like member having substantially the same dimensions as the first base plate and having the holes formed therein may be used.

  On the other hand, when the studs interposed between the upper and lower beams on the upper floor are continuously installed above the studs, the second base plate as in the invention according to claim 2. If the base plate integrated with the lower end of the intermediate pillar interposed between the beams on the upper floor is applied, the upper end of the lower intermediate pillar and the lower end of the upper intermediate pillar are used as the beam positioned between them. Can be fixed at the same time.

  On the other hand, when the studs interposed between the upper and lower beams on the lower floor are continuously installed below the studs, as the third base plate, By applying the base plate integrated to the upper end of the studs interposed between the beams on the floor, similarly, the lower end of the upper stud and the upper end of the lower stud are located between them. Can be fixed to the beam at the same time.

Thus, according to the invention described in any one of the first to third aspects, it is not necessary to remove the existing slab deck when adding the studs to the existing steel structure building. In addition, since the upper and lower flanges of the beam and the reinforcing member can be integrated by applying tension to the tension member, the reinforcing member may be simply sandwiched between the upper and lower flanges of the beam. There is no need to weld the upper and lower flanges to the reinforcing member.
Furthermore, since it is possible to eliminate welding between studs and beams and beam reinforcement plates as in the conventional installation structure, it is possible to eliminate work such as fire prevention measures and curing against the above welding sparks. become.

Therefore, the construction is extremely easy, and therefore the labor required for installing the studs can be greatly reduced, and the required construction period can be greatly shortened.
In addition, since the welding operation can be completely eliminated or limited to the few necessary portions, it is possible to avoid the problem of welding quality caused by a narrow space or an unreasonable working posture. .

  1 to 4 show an embodiment of an installation structure of studs in an existing building according to the present invention, and a steel column pillar structure is constituted by a steel pipe column 11 and a beam 12 made of H-shaped steel. In addition, a state in which an inter-column damper (inter-column) 14 is added to an existing building in which a floor slab 13 is placed on the beam 12 is shown. Here, the inter-column damper 14 is disposed between the upper and lower beams 11 at an intermediate position between the columns 11, and is further installed so as to be continuous toward the upper and lower floor directions.

  The inter-column dampers 14 installed so as to be continuous in the vertical direction are separated into an upper inter-column 14a and a lower inter-column 14b by cutting out an intermediate portion in the height direction, and the upper and lower inter-columns 14a, Between 14b, a hydraulic damper 15 for interposing a horizontal displacement is interposed. In the same manner as that shown in FIG. 7, the hydraulic damper 15 has one end 15a integrated with the upper stud 14a and the other end 15b integrally connected with the lower stud 14b.

  Further, rectangular plate-like base plates 16a and 16b are integrally joined to the upper and lower ends of the stud damper 14 facing the lower flange 12b of the upper beam 12 and the slab 13 on the lower beam 12, respectively. . Here, in these base plates 16a and 16b, holes 17 are formed at a plurality of locations on the outer peripheral portion (in the figure, two at each corner of the outer periphery on the long side, a total of eight locations) (see FIG. 3). The floor slab 13 on which the base plate 16b on the lower end side is placed also has a hole communicating with the hole 17.

  On the other hand, between the upper and lower flanges 12a and 12b of the beam 12, a plurality of square steel pipes (two on each side of the web in the figure) are formed so as to be located in the plane of the base plates 16a and 16b. A reinforcing member 18 is interposed. In addition, as shown in FIG. 4, each reinforcement member 18 is arrange | positioned so that the PC steel material 20 mentioned later may be located in the both ends of the longitudinal direction in planar view.

  The inter-column damper 14 has a hole 17 in the base plate (first base plate) 16a on the upper end side and a hole 17 in the base plate (second base plate) 16b on the lower end of the inter-column damper 14 on the upper floor. The PC steel material (tensile material) 20 is inserted through the hole formed in the floor slab 13, and after being further strained, the upper and lower end portions thereof are fixed to the base plates 16a and 16b by the fixing tools 21 and 22, respectively. It is fixed to the beam 12.

  On the other hand, at the lower end, the hole 17 of the base plate (first base plate) 16b on the lower end side of the inter-column damper 14 and the hole of the base plate (third base plate) 16a on the upper end of the inter-column damper 14 on the lower floor. In the same manner, after the PC steel material (tensile material) 20 is inserted and tensioned, the upper and lower end portions are fixed to the base plates 16a and 16b by the fixing tools 21 and 22, so that the lower beam 12 is fixed. It is fixed. In the figure, reference numeral 19 denotes a grout filled between the base plate 16b and the floor slab 13.

FIG. 5 shows another embodiment in which the present embodiment is applied to the installation structure of the stud damper 14 installed on the lowest floor.
In this installation structure, no inter-column damper is provided below (lower floor) the inter-column damper 14. Therefore, a flat base plate (third base plate) 24 is disposed on the lower surface of the lower flange 12b of the lower beam 12 so as to be positioned below the base plate 16b. The base plate 24 is formed to have substantially the same dimensions as the bail plate 16b, and a hole is formed at the same position as the base plate 16b.

  Further, at the lower end of the stud damper 14, the PC steel material 20 is inserted into the base plates 16 b and 24, the hole 17 formed in the slab, and the like, and the upper and lower ends are fixed to the fixing tools 21 and 22. Is fixed to the lower beam 12 by being fixed to the base plates 16b and 24.

  Further, FIG. 6 shows another embodiment in the case where no inter-column damper is provided above (upper floor) of the inter-column damper 14 due to the structure. In this installation structure, the floor slab 13 on the upper floor is shown. A flat base plate (second base plate) 23 in which a hole 17 is formed at the same position as the bail plate 16a is provided.

  The upper end portion of the stud damper 14 is inserted into the hole portion 17 of the base plates 16a and 23 and the hole portion of the slab 13 at the upper end portion thereof. By being fixed to the base plates 16 a and 23 by 22, they are fixed to the upper beam 12.

  According to the installation structure of the inter-column damper 14 in the existing building having the above-described configuration, the existing floor slab 13 is formed when the inter-column damper 14 is added to the frame constituted by the steel-structured columns 11 and beams 12. There is no need to remove the concrete or deck to be welded, and there is no need for welding between the studs and the beam and welding of the beam reinforcement plate as in the conventional installation structure, so work such as fire prevention measures and curing for the above welding sparks Can also be eliminated.

As a result, since the construction becomes extremely easy, the labor required for installing the stud damper 14 can be greatly reduced, and the required construction period can be greatly shortened.
In addition, since the welding operation can be completely eliminated or limited to the few necessary portions, it is possible to avoid the problem of welding quality caused by a narrow space or an unreasonable working posture. .

  In the above-described embodiment, only the case where the intermediate column damper 14 provided with the hydraulic damper 15 between the upper and lower inter-columns 14a and 14b is installed in the column beam frame of the existing steel structure building is shown. It is not limited, and a damping damping column in which a viscoelastic damper is interposed between the upper and lower columns 14a and 14b, and a hysteresis damping damper in which a low yield point steel is joined and integrated on the web portion of the H-shaped steel. The same can be applied to the case of installing various studs such as vibration damping studs.

  In addition, when the stud damper 14 is fixed to the upper and lower beams 12, the case where the PC steel material 20 is inserted into the holes 17 of the base plates 16a and 16b sandwiching the beams 12 up and down through the holes formed in the floor slab 13 will be described. However, when the upper and lower flanges 12a and 12b are large in width and have sufficient strength, holes are formed in the upper and lower flanges 12a and 12b of the beam 12 and communicated with the holes. The hole portions 17 of the base plates 16 a and 16 b are formed at the positions, and the PC steel material 20 may be inserted into the reinforcing member 18 by inserting the PC steel material 20 into the hole portions 17.

It is a front view which shows one Embodiment of the installation structure of the stud which concerns on this invention. It is the sectional side view seen from the AA line of FIG. FIG. 3 is a cross-sectional view taken along line BB in FIG. 1. It is CC sectional view taken on the line of FIG. It is a front view which shows other embodiment of this invention. It is a front view which shows other embodiment of this invention. It is a front view which shows the installation structure of the conventional stud. It is the sectional side view seen from the DD line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Column 12 Beam 13 Floor slab 14 Spacer damper 14a Upper space column 14b Lower space column 15 Hydraulic damper 16a, 16b Base plate 17 Hole 18 Reinforcement member 20 PC steel (tensile material)
21, 22 Fixing tool 23 Base plate (second base plate)
24 Base plate (third base plate)

Claims (3)

It has a column beam structure with steel beams built between the columns, where the upper flange and the lower flange are integrated by the web, and a slab is formed between the upper and lower beams of the existing building where the slab is formed on the beam Is a structure for installing
A first base plate is integrally provided at the upper and lower ends of the studs, a plurality of reinforcing members are interposed between the upper and lower flanges of the upper and lower beams where the first base plates are located, and the upper ends of the studs A second base plate is installed on the slab located above the first base plate on the section side, and is formed on the lower surface of the lower flange of the beam located below the first base plate on the lower end side of the stud. 3 base plates are provided, and at least the first to third base plates and the slab are respectively drilled with holes communicating in the vertical direction,
At the upper end portion of the stud, a tension material is inserted into the hole portions of the first and second base plates through the hole portions of the slab, and the upper and lower end portions thereof are fixed to the first and second base plates by fixing devices, respectively. To fix the studs to the upper beam,
At the lower end of the stud, a tension material is inserted into the holes of the first and third base plates through the holes of the slab, and the upper and lower ends are fixed to the first and third base plates by fixing devices, respectively. The installation structure of the stud in the existing building, wherein the stud is fixed to the beam on the lower side.   2. The base plate according to claim 1, wherein the second base plate is a base plate that is integrated with a lower end portion of a stud that is interposed between upper and lower beams on an upper floor so as to be continuous with the stud. Installation structure of studs in existing buildings.   3. The base plate according to claim 1, wherein the third base plate is a base plate that is integrated with an upper end portion of a stud that is interposed between upper and lower beams on a lower floor so as to be continuous with the stud. Installation structure of studs in the existing building described in 2.

Images