KR102142206B1 - Seismic retrofit of existing structue using spring damper and multipoint prestressed cable - Google Patents

Abstract

The present invention can dissipate the transfer load of seismic energy using a restorative damper and a multi-point inter-layer displacement control cable, can withstand large underground loads, reduce the design capacity of the damper by increasing the friction force, and replace the damper as needed Provides a seismic reinforcement system for existing buildings that can be applied with springs.
The seismic reinforcement system of an existing building using a restorative damper and a multi-point inter-layer displacement control cable according to an embodiment of the present invention uses two first and second dampers and two first and second inter-layer displacement control cables. In the seismic reinforcing system of existing buildings, after each damper pulley is freely installed on the working ends of two identical first and second dampers, the dampers are fixedly installed on one side and the other side of the lower end of the seismic reinforcement area of the existing building. Then, wind up any one interlayer displacement control cable to the damper pulley of the first damper and place it on two upper ends of the first and second cables spaced apart at a certain distance from two places on the upper end of the seismic reinforcement area of the existing building. Each end is fixed, and the other second interlayer displacement control cable is additionally provided to wind the damper pulley of the second damper, and the other 2 spaced apart at a distance from the upper two places of the seismic reinforcement area of the existing building. It is characterized in that a cable friction unit is installed in each of the three or four cable anchors to fix the ends, and to increase the frictional force when the cables for the first and second interlayer displacement control cables are operated in each interlayer slab of the existing building.

Description

Seismic retrofit of existing structue using spring damper and multipoint prestressed cable} Restoration damper and multipoint prestressed cable

The present invention relates to a seismic reinforcement system of an existing building, in particular, by using a restorative damper and a multi-point interlayer displacement control cable, it is possible to withstand a large underground load by dispersing the transfer load of seismic energy, and to design a damper with increased friction It is related to the seismic reinforcement system of existing buildings that can reduce the capacity and apply a spring instead of a damper if necessary.

In general, seismic reinforcement of existing buildings is done by reinforcing rigidity or installing dampers. In the case of stiffness reinforcement, construction work is required to change the structure of the existing building, and in the case of the damper, the number of installations increases because the damper must be installed at each weak point of the existing building. In addition, not only a reinforcing structure or a damper system capable of responding to different interlayer displacements is required, but also a damper needs to be replaced after an earthquake, which requires constant maintenance.

As a background technology of the present invention, as Korean Patent Registration No. 10-0983638, a'seismic reinforcement structure and method of an existing building' has been proposed. This is a structure in which a masonry wall is installed in a rectangular frame frame provided in an existing building, the anchorage being fixed to face along the inner side of the transverse beam and the longitudinal beam of the frame; A plurality of braces fixed to the anchorage and arranged diagonally; A first plate fixing the braces to the masonry wall so that the braces are arranged diagonally; A second plate interposed between the masonry wall and the first plate; wherein the masonry wall is punctured with bolts having threads on both sides of the punctured portions of the masonry wall and the first and second plates communicating with each other. Penetrate the adhesive filler into the part, and combine the first nut with the bolt so that the second plate is in close contact with the masonry wall, and then the second nut with the bolt end at the center of the first plate through the rest of the bolt In combination, the first plate is brought into close contact with the first nut, and the brace is pinned to the edge of the first plate, so that when the earthquake occurs, the brace is plastically deformed to absorb strain energy, thereby strengthening the horizontal load. Make it simple. However, the above background technology has the disadvantage that it is difficult to restore the building itself after an earthquake, and once the brace is plastically deformed, it needs to be replaced later.

Accordingly, the present applicant is another technique that is the background of the present invention, using a restorative damper and an interlayer displacement control cable through Korean Registered Patent Registration No. 10-1868877 to reduce the installation location of the damper and reduce the damper after an earthquake. We proposed a seismic reinforcement system for existing buildings that require no replacement and are advantageous for maintenance.

Here, the applicant has devised a method to implement a seismic system that can withstand a larger earthquake load and reduce the construction cost by reducing the design capacity of the damper.

Korean Registered Patent Registration No. 10-0983638 Korean Registered Patent Registration No. 10-1868877

The present invention can dissipate the transfer load of seismic energy using a restorative damper and a multi-point inter-layer displacement control cable, can withstand large underground loads, reduce the design capacity of the damper by increasing the friction force, and replace the damper as needed The aim is to provide a seismic reinforcement system for existing buildings that can be applied with springs.

The seismic reinforcement system of an existing building using a restorative damper and a multi-point inter-layer displacement control cable according to an embodiment of the present invention uses two first and second dampers and two first and second inter-layer displacement control cables. In the seismic reinforcing system of existing buildings, after each damper pulley is freely installed on the working ends of two identical first and second dampers, the dampers are fixedly installed on one side and the other side of the lower end of the seismic reinforcement area of the existing building. Then, wind up any one interlayer displacement control cable to the damper pulley of the first damper and place it on two upper ends of the first and second cables spaced apart at a certain distance from two places on the upper end of the seismic reinforcement area of the existing building. Each end is fixed, and the other second interlayer displacement control cable is additionally provided to wind the damper pulley of the second damper, and the other 2 spaced apart at a distance from the upper two places of the seismic reinforcement area of the existing building. It is characterized in that a cable friction unit is installed in each of the three or four cable anchors to fix the ends, and to increase the frictional force when the cables for the first and second interlayer displacement control cables are operated in each interlayer slab of the existing building.

In addition, the seismic reinforcing system of an existing building using a restorative damper and a multi-point interlayer displacement control cable according to another embodiment of the present invention, a seismic reinforcing system of an existing building using a third damper and a third interlayer displacement control cable In, after the damper pulley is freely installed on the working end of the third damper, a third damper is fixedly installed in the center of the lower end of the seismic reinforcement area of the existing building, and a certain distance from the upper end of the seismic reinforcement area of the existing building After installing the first and second idle pulleys spaced apart from each other, the third interlayer displacement control cable is wound around the damper pulley and the first and second idle pulleys, and both ends of the interlayer displacement control cable are seismic reinforcement areas of the existing building. It is characterized in that a cable friction unit is installed to fix the first and second cable lower fixtures installed on both sides of the lower end, and to increase the frictional force when the third interlayer displacement control cable is operated in each interlayer slab of the existing building.

In addition, the first and second dampers and the third damper is a damper housing that stores a fluid therein and is provided with a shaft support plate at one end; A spring compression plate located at the other end of the damper housing and movably installed toward a shaft support plate; An operating rod slidably receiving the flow resistance of the fluid in the damper housing and installed to move back and forth in the damper housing; A shaft connecting plate connected to the other end of the working rod; A spring compression shaft having one end fixedly connected to the shaft connecting plate and the other end connected to the spring compression plate; It characterized in that it comprises; a damper return spring; one end is supported by the shaft support plate and the other end is supported by the spring compression plate to return the working rod to its original position.

In addition, the friction unit is a steel plate fixed to the interlayer slab with an anchor bolt; A direction changing fixture installed along the arrangement direction of the first and second interlayer displacement control cables on the upper surface of the steel plate; A cylindrical cable clamp which is joined to the direction changing fixture, and which is cut upward and has mutually opposite bolt fastening flanges; A friction pad wrapped around the first and second interlayer displacement control cables and installed in a cylindrical cable clamp; It characterized in that it comprises; tightening bolts fastened to the bolt for tightening the bolt to force the friction pad and the friction pad when the behavior of the first and second interlayer displacement reducing cable by contracting the inner diameter of the cylindrical cable clamp.

The seismic reinforcing system of an existing building using a restorative damper and a cable for restraining multi-point interlayer displacement of the present invention disperses a seismic energy transfer load using a restorative damper and a multi-point interlayer displacement suppression cable with an increased fixed end. It can withstand large underground loads.

In addition, since the cable friction unit is applied, it is possible to reduce the design capacity of the damper by increasing the frictional force in accordance with the behavior of the cable for controlling the displacement between layers.

In addition, it is possible to implement a seismic reinforcement system of an existing building that can be applied to a spring by replacing it with a damper if necessary because a multi-point interlayer displacement control cable is applied.

The following drawings attached in the present specification are intended to illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the present invention, so the present invention is only described in the accompanying drawings. It is limited and should not be interpreted.
1A is a configuration diagram of an earthquake-proof reinforcement system of an existing building using a restorative damper and a cable for restraining multi-point interlayer displacement according to a first embodiment of the present invention.
Figure 1b is a behavior state diagram of the earthquake-resistant reinforcement system when the earthquake load on the existing building in the state of Figure 1a.
Figure 2 is a perspective view of the damper applied to Figure 1a.
Figure 3a is a front view of the damper applied to Figure 1a.
Figure 3b is an operational state of the damper shown in Figure 3a when the earthquake load arrives.
Figure 4a is a block diagram of a friction unit applied to the seismic reinforcement system of the present invention.
Figure 4b is a cross-sectional view taken along line AA of Figure 4a.
5A and 5B are diagrams showing the configuration of an earthquake-proof reinforcement system of an existing building using a restorative damper and a cable for restraining multi-point interlayer displacement according to a second embodiment of the present invention, before and after operation.

The present invention will be described in detail below with reference to the embodiments presented in the accompanying drawings, but the presented embodiments are illustrative for a clear understanding of the present invention and the invention is not limited thereto.

<First Example>

1A and 1B, the seismic reinforcement system of the existing building 5 according to the first embodiment of the present invention includes two first and second dampers 10 and 10a and two first and second dampers in the seismic reinforcement area A. , It is implemented to withstand large underground loads by applying the cables (21, 22) for restraint displacement between two layers.

First, damper pulleys 11 and 11a are respectively rotatably installed at the operating ends of the same first and second dampers 10 and 10a. The first and second dampers 10 and 10a in which the damper pulleys 11 and 11a are installed are fixedly installed on one side and the other side of the lower end of the seismic reinforcement area A of the existing building 5, as shown in FIG. 1A. At this time, the first and second dampers 10 and 10a may be installed to be fixed to the existing building 5 by hinge coupling through bolts or pins.

The first and second dampers 10 and 10a have the same configuration.

Therefore, any one of the first damper 10 stores the fluid therein as shown in FIGS. 3A and 3B, and the damper housing 102 and the other end of the damper housing 102 are provided with a shaft support plate 101 at one end. Located on the spring support plate 104 is installed to be movable toward the shaft support plate 101, and the sliding rod while receiving the flow resistance of the fluid in the damper housing 102, the operating rod installed to move back and forth in the damper housing 102 ( 106), the shaft connecting plate 108 connected to the other end of the working rod 106, and the spring compression shaft having one end fixedly connected to the shaft connecting plate 108 and the other end connected to the spring compression plate 104 110, one end is supported by the shaft support plate 101 and the other end is supported by a spring compression plate 104 is configured to include a damper return spring 112 to return the operating rod 106 to its original position. At this time, the working rod 106 is subjected to the flow resistance of the fluid passing through one or more unillustrated orifice holes formed on the piston (not shown) at the end of the working rod 106 when moving.

Therefore, in the state in which the operating rod 106 is retracted due to the seismic load W in the first damper 10, and when it moves forward as shown in FIG. 3B, the damper return spring 112 is generated together with the generation of fluid flow resistance. Due to the compression of the buffer action occurs. Thereafter, the operation rod 106 is moved to the original position due to the expansion of the damper return spring 112 due to the disappearance of the seismic energy.

Any one of the first interlayer displacement control cable 21 is installed. The first interlayer displacement suppression cable 21 is wound around the damper pulley 11 of the first damper 10, and at the same time, both ends of the first interlayer displacement suppression cable 21 are seismic of the existing building 5 It is fixed to two first and second cable upper fixtures 31 and 32, which are spaced apart by a predetermined distance from two places on one upper end of the reinforcement area A, respectively. In this way, the first interlayer displacement control cable 21 can disperse the transmission load according to the large ground load by increasing the fixed end by the first and second cable upper fixtures 31 and 32.

In addition, another second interlayer displacement control cable 22 is additionally installed. The second interlayer displacement control cable 22 is wound around the damper pulley 11a of the second damper 10a, and at the same time, both ends of the second interlayer displacement control cable 22 are seismic of the existing building 5 It is fixed to the other two third and fourth cable fasteners 33 and 34 spaced apart by a predetermined distance from two other places on the upper end of the reinforcement area A, respectively. In this way, the second interlayer displacement control cable 22 can disperse the transmission load according to the large underground load by increasing the fixed end by the third and fourth cable fasteners 33 and 34.

The cable friction unit 50 is installed at each interlayer slab 6 of the existing building 5 to increase the frictional force when the first and second interlayer displacement control cables 21 and 22 are operated.

The friction unit 50 is for fixing the first and second interlayer displacements on the upper surface of the steel sheet 502 and the steel sheet 502, which are fixedly installed with an anchor bolt 501 on the interlayer slab 6, as shown in FIGS. 4A and 4B. Cylindrical with a direction change fastener 504 installed along the arrangement direction of the cables 21 and 22 and a bolt fastening flange 505a which is joined to the direction change fastener 504 and is cut upward to face each other. The cable clamp 505, the first and second interlayer displacement suppression cables 21 and 22 are respectively wrapped, and the friction pad 506 installed in the cylindrical cable clamp 505 and the inner diameter of the cylindrical cable clamp 505 are provided. Including the tightening bolt 507 fastened to the bolt clamping flange 505a to force the friction pads 506 and the friction pads 506 when the first and second interlayer displacement control cables 21 and 22 are contracted. It is composed.

The operation of the seismic reinforcement system of the existing building constructed as described above will be described.

First, as shown in Figure 1a, when the seismic load (W) acts on the existing building (5) and receives vibrations to the right in Figure 1b, the positions of the first and second cable upper fixtures (31,32) also move to the right. do. Therefore, the first interlayer displacement control cable 21 connected to the first and second cable upper fixtures 31 and 32 pulls the operating rod 106 on the first damper 10 side, thereby causing the operating rod 106 to The flow resistance of the fluid is received, and at the same time, the damper return spring 112 is compressed by the movement of the spring compression 104. Due to this, the seismic load (W) arriving at the existing building (5) is consumed by the force pulling the working rod (106) and the force compressing the damper return spring (112). At this time, the friction pad 50 side of the friction unit 50 causes friction with the cable 21 for controlling the first interlayer displacement.

On the other hand, if the seismic load (W) acts on the existing building (5) and this time, on the contrary, causes vibration to the left, the second interlayer displacement control cable (22) connected to the upper and lower cables (33, 34) of the 3rd and 4th cables The second damper 10a is operated in the same manner as above to consume the seismic load W reaching the existing building 5. Of course, at this time, the friction unit 50 side friction pad 506 is friction with the second interlayer displacement control cable 22 to increase the horsepower.

Therefore, when the seismic load (W) causes vibration to the existing building (5), the first damper 10 and the first damper 10 and the second interlayer displacement control cable (21) and the second interlayer displacement control cable (22) respectively connected to 2 The damper 10a operates sequentially, absorbing the impact of vibrational energy. At the same time, part of the seismic energy (E) is converted to thermal energy generated from friction between the cable friction unit 50 and the cables 21 and 22 for controlling the first and second interlayer displacement.

As described above, the seismic load (W) arriving at the existing building (5) moves the working rod (106) while receiving compression and fluid resistance of the damper return spring (112) through the first and second dampers (10, 10a). It is consumed as energy, and at the same time, it is consumed as friction energy through the cable friction unit 50 to prevent damage and collapse of the existing building 5. At this time, it is possible to withstand a large underground load through the increased installation of the first and second interlayer displacement control cables 21 and 22, and the transfer load is increased by the fixed end increase of the first and second interlayer displacement control cables 21 and 22 By effectively dispersing, the seismic system operates stably. In addition, it is possible to reduce the design capacity of the first and second dampers 10 and 10a by applying the cable friction unit 50, and replace the first and second dampers 10 and 10a as necessary to apply spring only. It is possible. In addition, the existing building 5 can prevent deformation of the existing building 5 after the arrival of the earthquake with the return ability of the damper return spring 112.

<Second Example>

The seismic reinforcing system of the existing building 5 according to the second embodiment of the present invention is a third damper 10b and a third interlayer displacement suppression in the seismic reinforcing region A as shown in FIGS. 5A and 5B. It is implemented by applying the dragon cable (23).

3A and 3B, a damper pulley 11b is rotatably installed at an operating end of the third damper 10b. The third damper 10b in which the damper pulley 11b is installed is fixedly installed at the lower center of the seismic reinforcement area A of the existing building 5. At this time, the third damper 10b is the same as the configuration of the first damper 10 or the second damper 10a, so a detailed description is omitted.

In addition, the first and second idle pulleys 13 and 13a are installed to be spaced apart from each other by a certain distance from the upper end of the seismic reinforcement area A of the existing building 5. The first and second cable lower fasteners 41 and 42 are installed on both lower ends of the seismic reinforcement area A of the existing building 5. The third interlayer displacement suppression cable 23 is wound around the damper pulley 11b and the first and second idle pulleys 13 and 13a, and at the same time, both ends of the interlayer displacement suppression cable 23 are provided under the first and second cables. It is connected and fixed to the fixtures 41 and 42. In addition, the same cable friction unit 50 is installed in each interlayer slab 6 of the existing building 5 to generate energy dissipation through friction with the third interlayer displacement control cable 23.

The seismic reinforcement system of the second embodiment configured as described above operates as follows.

First, as shown in Figure 5b, when the earthquake load (W) causes vibration in the existing building (5), the position of the first and second idle pulley (13,13a) is changed, the installation position of the damper pulley (11b) is changed Accordingly, the distance between the fixed point of the damper pulley 11b and the first idle pulley 13 or the distance between the fixed point of the damper pulley 11b and the fixed point between the second idle pulley 13a is controlled. 3 A tension is generated in the cable 23 for restraint displacement to absorb the impact of vibration energy from the third damper 10b. At the same time, part of the seismic load (W) is converted into thermal energy generated from friction between the cable friction unit 50 and the cable 23 for controlling the third interlayer displacement.

In this way, even in the second embodiment, the seismic load (W) arriving at the existing building (5) moves the working rod (106) while receiving compression and fluid resistance of the damper return spring (112) through the third damper (10b). At the same time, it is consumed as energy, and at the same time, it is consumed as friction energy through the cable friction unit 50 to prevent damage and collapse of the existing building 5. In addition, the existing building (5) is to prevent the deformation of the existing building (5) after the arrival of the earthquake with the return ability of the damper return spring (112). Of course, it is possible to distribute the transfer load according to the increase in the upper fixed end of the cable 23 for interlayer displacement control, and of course it is possible to reduce the design capacity of the third damper 10b according to the increase in the frictional force.

10,10a: 1st, 2nd damper
10b: third damper
11,11a: Damper pulley
13,13a: 1st, 2nd child pulley
21: first interlayer displacement control cable
22: second interlayer displacement control cable
31,32: 1st, 2nd cable upper fixture
33,34: 3rd and 4th cable fixture
50: cable friction unit

Claims (5)

In the seismic reinforcement system of the existing building (5) using two first and second dampers (10,10a) and two first and second interlayer displacement control cables (21,22),
After the damper pulleys 11 and 11a are respectively rotatably installed on the working ends of the two same first and second dampers 10 and 10a, respectively, the lower one side and the other side of the seismic reinforcement area A of the existing building 5 Dampers (10,10a) are fixedly installed on each,
The cable 21 for restraining any first interlayer displacement is wound around the damper pulley 11 of the first damper 10 by a certain distance to two places on the upper one side of the seismic reinforcement area A of the existing building 5 The ends are respectively fixed to the two first and second cable upper fixtures 31 and 32 spaced apart,
Another second interlayer displacement control cable 22 is additionally provided to take up the damper pulley 11a of the second damper 10a and wind it up to the damper pulley 11a of the second damper 10a. The ends are fixed to the other two third and fourth cable fasteners 33 and 34 spaced apart from each other by a certain distance,
Restoration type, characterized in that a cable friction unit (50) is installed in each interlayer slab (6) of the existing building (5) to increase the friction when the first and second interlayer displacement control cables (21, 22) are in motion. Seismic reinforcement system for existing buildings using dampers and cables for multi-point interlayer displacement control. In the seismic reinforcement system of the existing building (5) using a third damper (10b) and a cable for controlling the third interlayer displacement,
After rotationally freely installing the damper pulley 11b at the working end of the third damper 10b, the third damper 10b is fixedly installed at the lower center of the seismic reinforcement area A of the existing building 5,
Install the first and second idle pulleys 13 and 13a spaced apart from each other at a certain distance from the upper end of the seismic reinforcement area A of the existing building 5,
After winding the third interlayer displacement suppression cable 23 to the damper pulley 11b and the first and second idle pulleys 13 and 13a, the both ends of the interlayer displacement suppression cable 23 are seismic of the existing building 5 Fix to the first and second cable lower fixtures (41,42) installed on both sides of the bottom of the reinforcement area (A)
Restorative damper and multi-point, characterized in that each interlayer slab 6 of the existing building 5 is provided with a cable friction unit 50 which increases the frictional force when the third interlayer displacement control cable 23 moves. Seismic reinforcement system for existing buildings using cables for interlayer displacement control. According to claim 1,
The first and second dampers 10 and 10a are
A damper housing 102 storing fluid therein and having a shaft support plate 101 installed at one end;
A spring compression plate 104 positioned at the other end of the damper housing 102 and movably installed toward the shaft support plate 101;
An operating rod (106) slidably receiving the flow resistance of the fluid in the damper housing (102) and movably installed in the damper housing (102);
A shaft connecting plate 108 connected to the other end of the working rod 106;
A spring compression shaft 110 having one end fixedly connected to the shaft connecting plate 108 and the other end connected to the spring compression plate 104;
Restorative damper and multi-point, characterized in that it comprises; a damper return spring 112, one end is supported by the shaft support plate 101 and the other end is supported by the spring compression plate 104 to return the operating rod 106 to its original position Seismic reinforcement system for existing buildings using cables for interlayer displacement control. According to claim 2,
The third damper 10b
A damper housing 102 storing fluid therein and having a shaft support plate 101 installed at one end;
A spring compression plate 104 positioned at the other end of the damper housing 102 and movably installed toward the shaft support plate 101;
An operating rod (106) slidably receiving the flow resistance of the fluid in the damper housing (102) and movably installed in the damper housing (102);
A shaft connecting plate 108 connected to the other end of the working rod 106;
A spring compression shaft 110 having one end fixedly connected to the shaft connecting plate 108 and the other end connected to the spring compression plate 104;
One end is supported by the shaft support plate 101 and the other end is supported by a spring compression plate 104, a damper return spring 112 for returning the working rod 106 to the original position; Restorative damper and multi-point comprising a Seismic reinforcement system for existing buildings using cables for interlayer displacement control. According to claim 1,
The friction unit 50 is
A steel plate 502 fixed to the interlayer slab 6 with an anchor bolt 501;
A direction changing fixture 504 installed on the upper surface of the steel plate 502 along the arrangement direction of the first and second interlayer displacement suppression cables 21 and 22;
A cylindrical cable clamp 505 which is joined to the direction changing fixture 504 and has a bolt clamping flange 505a that is cut upward and faces each other;
A friction pad 506 installed on the cylindrical cable clamp 505 by wrapping the first and second interlayer displacement control cables 21 and 22, respectively;
Shrink the inner diameter of the cylindrical cable clamp 505 to the bolt clamping flange 505a to force the friction pad 506 when the first and second interlayer displacement control cables 21 and 22 are actuated. Seismic reinforcement system of the existing building using a restorative damper and a cable for restraining multi-point interlayer displacement, characterized in that it includes a tightening bolt (507).

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