JP5934033B2 - Seismic reinforcement structure and method using compression braces - Google Patents

Description

  The present invention relates to a seismic reinforcing structure and a reinforcing method for a building using a compression brace.

  Conventionally, various types of bracing with steel frames have been proposed as seismic reinforcement structures for existing RC and SRC buildings (for example, Patent Documents 1 to 4). However, with a steel frame, noise, vibration, and dust are generated when a post-construction anchor is placed during construction. In addition, some post-construction anchors are filled with non-shrink mortar, but the construction period becomes longer due to the work such as filling, curing, and formwork dismantling. As a solution to such a problem, one using a compression brace has been proposed (Patent Document 5).

The seismic reinforcement structure of a building using the compression brace according to the above proposed example is a core material whose both ends are connected to the frame of an existing building, and the buckling of the core material is constrained by being arranged along both sides of the core material. A compression brace having a restraining material to be used is used, and the core material is divided into a pair of split core materials at a portion restrained by the restraining material in the length direction.
In the seismic reinforcement structure with this configuration, the compression brace is composed of a pair of split cores divided at the part where the core is constrained by the restraining material in the length direction. Can be eliminated, and the joining with the frame of the existing building can be simplified. Thereby, it is possible to perform seismic reinforcement with a simple construction and a short construction period, and it is possible to solve the problems of noise, vibration and dust associated with the construction.

JP 2000-257270 A Japanese Patent No. 4016524 JP 11-050691 A JP-A-10-115105 Japanese Patent No. 4917168

  In the seismic reinforcement of existing buildings, there is a demand for reinforcement while living, called “reinforcement while living”. In order to realize “Reinforcement while staying”, it is of course important to suppress dust and noise during construction, but it is important that the reinforcement members be transportable, easy to assemble, and that construction on site is unwelded. It becomes an element. That is, when the reinforcing member is large, it is difficult to carry it to the reinforcing part, and welding construction in an existing building increases the risk of fire. In the compression brace used as a reinforcing member in the seismic reinforcing structure disclosed in Patent Document 5, the core material is divided, but the restraint material is an integral member, so that the member becomes long and heavy, and this is the requirement described above. Can't meet.

An object of the present invention is to provide a seismic reinforcing structure and a reinforcing method using a compression brace capable of improving the transportability and workability of members, and capable of construction without welding.
Another object of the present invention is to eliminate an initial operation in which a gap is generated between the divided core materials and the core material slips so as to eliminate the clearance when an earthquake occurs, and transmission of the compressive force by the core material can be eliminated. It is to be able to do it immediately.

  The seismic reinforcement structure using a compression brace according to the present invention is a structure in which an existing building is reinforced with braces, and the brace extends along both sides of the core material, both ends of which are connected to the frame of the existing building. A compression brace that is disposed and constrains the buckling of the core material, and the core material is divided at a portion that is constrained by the constraint material. Is divided into two or more brace divided bodies, and the PC steel rod insertion hole and nut housing recess extending in the length direction are formed in the restraining material at the divided side ends of the brace divided bodies. And the adjacent brace divided bodies are inserted into the PC steel rod insertion holes of the two brace divided bodies, and the PC steel rod is accommodated in the nut housing recess. With nuts to screw Characterized in that an integral compression brace joined. The PC steel rod insertion hole may be a sleeve. The above-mentioned "divide the whole compression brace at the portion where the core material is divided" means that the core material is divided on the divided surface as long as the ease of construction and transportation by the division is ensured. There may be some irregularities between the end faces of the restraining material.

According to this structure, since the compression brace used as a reinforcing member can be assembled and integrated from a plurality of brace divided bodies, transportation and construction are facilitated. That is, for example, even when the reinforcement member is carried in a narrow route or is carried by an elevator or the like, it can be easily carried in. Moreover, since there is no on-site welding work, the risk of fire can be reduced. Since the joining of the brace divided body is a dry joining, the workability is improved.
Moreover, if it is a normal brace, since a tensile force will be borne, a junction part will become complicated, but since the compression brace is used as a reinforcement member, the structure of the junction part between brace division bodies can also be simplified. . Furthermore, since the PC steel bar and nut used for joining the brace segments are also accommodated in the restraint material, there is an advantage that the appearance is clean. Due to the compression brace, the above-described problems in construction in the conventional brace with a steel frame do not occur.

In this invention, it is preferable to provide a partition plate for the restraining material on the split side end face of the brace split body.
By providing the partition plate of the restraining material on the split side end surface of the brace divided body, the constraining materials of the adjacent brace divided bodies in the integration of the compression brace are joined and joined to each other by the partition plate. Unlike the case where the contact is made on the concrete surface, a gap due to the unevenness of the contact surface is unlikely to occur, and the joining of the restraining materials can be ensured.

In the present invention, a steel material perpendicular to the length direction may be interposed between the adjacent brace divided bodies.
When a steel material is interposed between adjacent brace segments, the core material of both brace segments is pressed against the steel material in the integration of the compression braces, and the end surface, which is the joint surface of the core material, is securely attached to the steel material by the crimping force. Can be adhered to. By eliminating the gaps in close contact in this way, there is no initial operation in which slip occurs so as to eliminate the gaps between the cores when an earthquake occurs, and the compression force can be transmitted immediately by the cores.

In this case, it is preferable that the core material is protruded to the steel material side with respect to the restraint material at the split side end portions in the adjacent brace split bodies.
Thus, the core material can be more reliably crimped to the steel material by projecting the core material to the steel material side than the restraining material at the split side end of each brace divided body.

In the present invention, at the split side end portion in the adjacent brace split body, the core material protrudes to the other brace split body side of the brace split body in one brace split body, and the core in the other brace split body. The material may be retracted into the brace segment rather than the restraining material.
In the case of this configuration, the joint surface between the core material and the restraint material can be shifted in the length direction between the adjacent brace divided bodies, and a higher restraint effect can be obtained.

The seismic reinforcement method using a compression brace according to the present invention is a method of reinforcing an existing building by connecting both ends of the brace to a frame of an existing building, and the core material having both ends connected to the frame of the existing building as the brace. And a compression brace that is arranged along both sides of the core material and has a restraining material that restrains buckling of the core material, and the core material is divided at a portion that is restrained by the restraining material, The compression brace is divided into two or more brace divided parts by dividing the whole of the core material into parts, and extends in the length direction to the constraining material at the divided side ends of the brace divided parts. PC steel rod insertion hole for PC steel rod and nut housing recess, PC steel rod for inserting adjacent brace divided bodies across the PC steel rod insertion holes of both brace divided bodies, and nut housing Stored in the recess Characterized by an integral compression brace joined by a nut screwed to the PC steel bars Te.
According to this seismic reinforcement method, as described above for the seismic reinforcement structure of the present invention, it becomes possible to improve the transportability and workability of the member and to perform construction without welding.

The seismic reinforcement structure using a compression brace according to the present invention is a structure in which an existing building is reinforced with braces, and the brace extends along both sides of the core material, both ends of which are connected to the frame of the existing building. A compression brace that is disposed and constrains the buckling of the core material, and the core material is divided at a portion that is constrained by the constraint material. Is divided into two or more brace divided bodies, and the PC steel rod insertion hole and nut housing recess extending in the length direction are formed in the restraining material at the divided side ends of the brace divided bodies. And the adjacent brace divided bodies are inserted into the PC steel rod insertion holes of the two brace divided bodies, and the PC steel rod is accommodated in the nut housing recess. With nuts to screw Since the integral of the compression brace joined, improving transportability and construction of the member, and construction by no welding is possible.
When a steel material perpendicular to the length direction is interposed between the adjacent brace divided bodies, the initial operation in which slip occurs so as to eliminate the gap between the core divided bodies when an earthquake occurs is eliminated. The compression force can be transmitted immediately.

  The seismic reinforcement method using a compression brace according to the present invention is a method of reinforcing an existing building by connecting both ends of the brace to a frame of an existing building, and the core material having both ends connected to the frame of the existing building as the brace. And a compression brace that is arranged along both sides of the core material and has a restraining material that restrains buckling of the core material, and the core material is divided at a portion that is restrained by the restraining material, The entire compression brace is divided into two or more brace divided parts by dividing the core material into parts, and extends in the length direction to the restraining material at the split side end of the brace divided parts. PC steel rod insertion hole for PC steel rod and nut housing recess, PC steel rod for inserting adjacent brace divided bodies across the PC steel rod insertion holes of both brace divided bodies, and nut housing Stored in the recess It said to integrated compression brace joined by a nut screwed to PC steel bars, improve transportability and construction of the member, and construction by no welding is made possible Te.

It is a front view of the building frame using the earthquake-proof reinforcement structure concerning a 1st embodiment of this invention. It is the external appearance perspective view and sectional drawing of the compression brace in the seismic reinforcement structure. It is an expanded sectional view of the A section in FIG. It is an expanded sectional view of the B section in FIG. It is an expanded sectional view of the C section in FIG. It is a top view which shows the assembly process of a compression brace. It is sectional drawing of the same assembly process. It is a top view which shows the assembly process of the other structural example of a compression brace. It is sectional drawing of the same assembly process. It is a top view which shows the assembly process of the further another structural example of a compression brace. It is sectional drawing of the same assembly process.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partial front view showing a frame structure of an existing building to which the seismic reinforcement structure of this embodiment is applied. The seismic reinforcement structure of this embodiment is a structure that reinforces an existing building using the compression braces 2A and 2B. As shown in the figure, the building frame has a beam 30 horizontally mounted between two adjacent columns 20, 20, and the upper part between the columns 20, 20 on both sides along the lower surface of the beam 30. A steel frame material 1 is provided. Below the upper steel frame member 1, two compression braces 2A and 2B are arranged in an inverted V shape. That is, the first compression brace 2 </ b> A is provided between the intermediate portion of the upper steel frame member 1 and the lower end of the one column 20, and between the intermediate portion of the upper steel frame member 1 and the lower end of the other column 20. Is provided with a second compression brace 2B. The building frame is RC or SRC.

  The upper steel frame member 1 is made of, for example, H-shaped steel as shown in FIG. 3 showing an enlarged view of the portion A in FIG. 1 and FIG. 4 showing an enlarged sectional view of the portion B in FIG. End plates 1b are provided at both ends. A mortar 22 is filled between the column 20 and the beam 30 and the upper steel frame member 1, and the end plates 1b at both ends of the upper steel frame member 1 are bolted and bolted (not shown) as shown in FIG. By joining to the column 20, the upper steel frame member 1 is joined to the building frame. Each bolt 23 is an anchor such as a hole-in anchor provided in the post-construction on the beam 30 or the pillar 20, for example.

  One end of each of the first and second compression braces 2A and 2B is joined to the lower end of each column 20 via a connecting member 3a, and the other end of each of the compression braces 2A and 2B is connected via another connecting member 3a. It is joined to the middle part of the upper steel frame material 1.

Each of the compression braces 2A and 2B is a member that resists a horizontal force applied to the building frame. As shown in FIG. It has a pair of restraining materials 4 and 4 for restraining bending. The core material 3 is a strip-shaped flat steel plate, and is made of a steel material having a low yield point, such as an SN material (rolled steel material for building structures) or a LYP material (extremely low yield point steel material).
The restraint material 4 is configured by filling a mortar or concrete 6 in a channel steel material 5 that opens toward the core material 3, for example. An unbond material 9 made of a viscous elastic body is interposed between the core material 3 and the restraint material 4. Spacers 19 are provided on both side surfaces of the core material 3 to secure a gap between the pair of constraining materials 4 and 4 facing each other. The spacer 19 is made of a linear steel material or rubber material, but may be omitted.
The connecting member 3 a is provided at both ends of the core material 3. The connecting member 3 a is a plate-like member and may be joined to the core material 3 or integrally formed with the core material 3. The connecting member 3 a is provided with reinforcing ribs 3 aa on both sides along the longitudinal direction, and the reinforcing ribs 3 aa protrude from slit portions provided in the vicinity of the ends of the channel steel material 5 of the restraining material 4.

In the example of the figure, the connecting members 3a at both ends of the compression braces 2A and 2B are plate-like portions integrally formed at both ends of the core material 3, and FIG. 3 and an enlarged cross-sectional view of a portion C in FIG. As shown in FIG. 5, each connecting member 3 a is provided with end plates 10 and 11 at its end portions. The end plates 10 and 11 are, for example, L-shaped bent at a right angle. The direction of the line that bisects the L-shaped bending angle is the length direction of the compression braces 2A and 2B. The end plates 10 and 11 protrude to both sides of the connecting member 3a, but may protrude only to one side. These end plates 10 and 11 are provided with a plurality of bolt insertion holes.

  As shown in FIG. 5, the mortar 22 is filled between the column 20 and the beam 30 and the connecting member 3a at the lower end of both compression braces 2A and 2B, and the vertical piece of the end plate 10 provided on the connecting member 3a and By joining the horizontal piece to the column 20 and the beam 30 with a bolt 23 and a nut (not shown) such as a hole-in anchor, the lower ends of both compression braces 2A and 2B are connected to the existing building frame.

  As shown in FIG. 3, a mounting steel plate 24 that protrudes vertically downward from the web 1 a is provided in the middle portion of the upper steel frame member 1. The vertical and horizontal pieces of the end plate 11 provided on the connecting member 3a at the upper ends of both compression braces 2A and 2B are joined to the mounting steel plate 24 and the web 1a of the upper steel frame member 1 with bolts 23. Thus, the upper ends of both compression braces 2A and 2B are connected to the existing building frame via the upper steel frame member 1. The vertical pieces of the end plates 11 of both the compression braces 2A and 2B are joined together with the mounting steel plate 24 with bolts 23 in an overlapping state.

  The compression braces 2A and 2B have a structure in which the entire core material 3 is divided at a portion constrained by the restraint material 4. That is, the restraint material 4, the spacer 19, and the unbond material 9 are divided, and the restraint material 4 is divided into two restraint material divisions (in the following description, the "constraint material split body" is simply "restraint material"). 4 ”). Further, as shown in FIGS. 6 and 7 showing the assembly process of the compression braces 2A and 2B, the compression braces 2A and 2B are divided into two or more (here, two) at the portion where the core material 3 is divided. ), And a plurality of PC steel rod insertion holes 13 and nut housing recesses 14 extending in the length direction are formed in the constraining material 4 at the split side end portions of the brace divided body 12. Is provided (FIG. 6A, FIG. 7A). The PC steel rod insertion hole 13 is formed of, for example, a mortar or a sleeve embedded in the concrete 6. The adjacent brace divisions 12 and 12 are accommodated in the PC steel rod 15 inserted over the PC steel rod insertion hole 13 of the both brace divisions 12 and 12 and the nut accommodation recess 14 and stored in the nut housing recess 14. It joins with the nut 16 screwed together to the PC steel rod 15, and it is set as integral compression brace 2A, 2B (FIG.6 (C), FIG.7 (C)). Each nut housing recess 14 communicates with a corresponding PC steel rod insertion hole 13 and opens on the surface of the restraint member 4. 6 shows the assembly process of the compression braces 2A and 2B in a plan view, and FIG. 7 shows the assembly process in a longitudinal sectional view. In FIG. 6A, a plan view of the adjustment plate 17 is surrounded by a chain line.

  Here, an adjustment plate 17, which is a steel material perpendicular to the length direction, is interposed between the adjacent brace divided bodies 12 and 12 over the entire divided surface. As shown in FIG. 6A, the adjustment plate 17 is provided with a PC steel rod insertion hole 17a through which the PC steel rod 15 is inserted. In addition, a partition plate 4 a of the restraining material 4 is provided on the split side end face of each brace split body 12. The partition plate 4a is made of, for example, a steel plate, and is joined to the grooved steel material 5 of the restraining material 4 by welding or the like so as to cover the end. The partition plate 4a is also provided with a PC steel rod insertion hole (not shown) through which the PC steel rod 15 is inserted. At the split side end of each brace split body 12, the core material 3 is disposed so as to slightly protrude from the restraint material 4 toward the adjustment plate 17.

  Next, the assembly process for assembling and integrating the compression braces 2A and 2B will be described in detail. First, the brace divided bodies 12 and 12 that are adjacent to each other with the adjustment plate 17 interposed therebetween are abutted so that the divided side ends of the restraining members 4 face each other (FIGS. 6A and 7A). Next, one end side of the PC steel rod 15 is inserted into the PC steel rod insertion hole 13 of one brace divided body 12, and the PC steel rod 15 is also inserted into the PC steel rod insertion hole 17a of the adjustment plate 17 ( 6B and FIG. 7B, and the other end of the PC steel rod 15 is inserted into the PC steel rod insertion hole 13 of the other brace segment 12. Next, the nut 16 is screwed into the PC steel bar 15 protruding into each nut housing recess 14, and tension is introduced into the PC steel bar 15 by torque management. Thereby, the core material 3 of the adjacent brace division bodies 12 and 12 is pressed against the adjustment plate 17 that is a steel material, and the end surface that is the joint surface of the core material 3 is securely adhered to the adjustment plate 17 by the pressure-bonding force. Can do. Since the core material 3 of each brace divided body 12 is slightly protruded toward the adjustment plate 17 than the restraint material 4, the bonding to the adjustment plate 17 can be made more reliable. At this time, since the partition plate 4a arranged on the split side end face of the restraining member 4 of each brace divided body 12 is also in close contact with the adjustment plate 17, the core material 3 and the partition plate 4a between the adjacent brace divided bodies 12 and 12 are attached. Can be assembled into an integrated compression brace 2A, 2B. It should be noted that the nut housing recess 14 may be filled with mortar after the brace bodies 12 and 12 are tightly coupled together with the PC steel rod 15 and the nut 16.

As described above, according to the seismic reinforcement structure and the reinforcing method using the compression braces, the compression braces 2A and 2B used as the reinforcing members can be assembled and integrated from the plurality of brace divided bodies 12, thereby facilitating transportation and construction. That is, for example, even when the reinforcement member is carried in a narrow route or is carried by an elevator or the like, it can be easily carried in. Moreover, since there is no on-site welding work, the risk of fire can be reduced. Since the joining of the brace divided body 12 is a dry joining, the workability is improved.
In addition, if the braces are ordinary braces, the joint portion becomes complicated because it bears the tensile force. However, since the compression braces 2A and 2B are used as the reinforcing members, the structure of the joint portion between the brace segments 12 is simplified. can do. Furthermore, since the PC steel rod 15 and the nut 16 used for joining the brace divided bodies 12 and 12 are also accommodated in the restraint material 4, there is an advantage that the appearance is clear.
In addition, since the adjustment plate 17 perpendicular to the length direction is interposed between the adjacent brace divided bodies 12 and 12, the end surfaces which are the mutual contact surfaces of the divided body of the core material 3 as described above, The core plate 3 can be brought into close contact with the adjustment plate 17, so that there is no initial operation in which the core material 3 slips so as to eliminate the gap between the divided members of the core material 3 when an earthquake occurs, and the transmission of the compression force by the core material 3 is immediately Can be done.

  8 and 9 show an assembling process of another configuration example of the compression braces 2A and 2B. 8 shows a plan view thereof, and FIG. 9 shows a longitudinal sectional view thereof. In this configuration example, at one end portion of the adjacent brace segments 12, 12, one brace segment 12 projects the core material 3 to the other brace segment 12 side rather than the restraint material 4, and the other brace segment 12, 12. In the brace divided body 12, the core material 3 is retracted slightly shorter than the protruding length into the brace divided body 12 than the restraining material 4 (FIGS. 8A and 9A), FIG. 6 and FIG. The adjustment plate 17 in the configuration example shown in FIG. Other configurations are the same as those of the configuration example shown in FIGS.

  In the case of this configuration example, after one end side of the PC steel rod 15 is inserted into the PC steel rod insertion hole 13 of one brace segment 12, the other end side of the PC steel rod 15 is connected to the other brace segment 12. The core material 3 protruding from the other brace divided body 12 is inserted into one brace divided body 12 (FIGS. 8B and 9B). Next, the nut 16 is screwed into the PC steel bar 15 protruding into each nut housing recess 14, and tension is introduced into the PC steel bar 15 by torque management (FIGS. 8C and 9C). Thereby, the core materials 3 of the adjacent brace division bodies 12 and 12 are joined in the restraining material 4 of one brace division body 12. At this time, since the partition plates 4a arranged on the split side end surfaces of the restraint member 4 of each brace divided body 12 are also in close contact with each other, the core material 3 and the partition plate 4a between the adjacent brace divided bodies 12 and 12 are made of metal. It can be assembled into an integrated compression brace 2A, 2B while being joined to the touch. Moreover, since the joint surface of the core material 3 and the restraint material 4 can be shifted between the adjacent brace division bodies 12 and 12, a higher restraint effect can be expected.

  10 and 11 show an assembling process of still another configuration example of the compression braces 2A and 2B. 10 shows a plan view thereof, and FIG. 11 shows a longitudinal sectional view thereof. In this configuration example, one compression brace 2A, 2B is divided into three brace divided bodies 12, and the joining structure of the adjacent brace divided bodies 12, 12 is that of the configuration example shown in FIGS. Same as the case.

  In this way, by dividing the compression braces 2A and 2B used as the reinforcing members into two or more brace divided bodies 12, the division size and number of the brace divided bodies 12 can be freely set according to the construction environment. The seismic reinforcement structure and the reinforcement method can be used regardless of the construction site.

2A, 2B ... Compression brace 3 ... Core material 4 ... Restraint material 4a ... Partition plate 12 ... Brace segment 13 ... PC steel rod insertion hole 14 ... Nut housing recess 15 ... PC steel rod 16 ... Nut 17 ... Adjustment plate

Claims (5)

  A structure in which an existing building is reinforced with braces, and the braces are arranged along both sides of the core material, both ends of which are connected to the frame of the existing building, and restrain the buckling of the core material. A compression brace obtained by dividing the core material at a portion constrained by the constraint material, and dividing the entire compression brace into two parts by dividing the core material. In addition to the brace divided bodies described above, PC steel bar insertion holes and nut storage recesses extending in the length direction are provided at the split-side end portions of the restraining members in these brace divided bodies, and the adjacent brace divided bodies are adjacent to each other. Are joined together by a PC steel rod inserted over the PC steel rod insertion holes of these brace divided bodies and a nut that is housed in the nut housing recess and screwed into the PC steel rod. Features a compression brace Seismic reinforcement structure by compression brace to.   The earthquake-proof reinforcement structure according to claim 1, wherein the brace divided body adjacent to each other has a compression brace in which a steel material perpendicular to the length direction is interposed.   The earthquake-proof reinforcement structure according to claim 2, wherein the core material is protruded toward the steel material side relative to the constraining material at a split side end portion in the adjacent brace split body.   In Claim 1, in the division side end part in the above-mentioned adjacent brace division, in one brace division, the core material is projected to the other brace division side rather than the restraint material, and in the other brace division, the above-mentioned A seismic reinforcement structure using a compression brace in which a core material is retreated into the brace divided body rather than the restraint material. A method of reinforcing an existing building by connecting both ends of a brace to a frame of an existing building, and as the brace, both ends are connected to the frame of the existing building and arranged along both sides of the core And using a compression brace obtained by dividing the core material at a portion constrained by the restraint material, and the core material is used as a whole. The divided portion is divided into two or more brace divided bodies, and a PC steel rod insertion hole extending in the length direction and a nut housing recess are formed in the restraining material at the divided side end portions of the brace divided bodies. And the adjacent brace segments are screwed into the PC steel rods, which are housed in the PC steel rods inserted into the PC steel rod insertion holes of the two brace segments and the nut housing recesses. Join with the mating nut Retrofit method by compression braces, characterized in that the compression brace body.

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