KR20220049811A - Seismic retrofit method of masonry buildings using reinforcement strip - Google Patents

Abstract

The present invention relates to a seismic reinforcement method for a masonry structure, which reinforces a masonry structure by filling a vertical groove with a filler after inserting a reinforcing strip into the vertical groove formed as a masonry wall is cut to be connected to a vertical joint in the masonry structure, thereby minimizing damage to an existing structure and thus, improving resistance to a lateral force while enabling work in a residential status. According to the present invention, the seismic reinforcement method for a masonry structure using a reinforcing strip is to conduct seismic reinforcement on the existing masonry structure degraded. The seismic reinforcement method for a masonry structure using a reinforcing strip comprises: a step (a) of forming a vertical groove of multiple rows by cutting a masonry wall to be vertically connected to the selected vertical joint among vertical joints of the masonry wall, wherein bricks of vertical rows are alternately piled in the masonry wall; a step (b) of inserting a reinforcing strip into the vertical groove; and a step (c) of filling a space between the vertical groove and the reinforcing strip with the filler to fix the reinforcing strip.

Description

Seismic retrofit method of masonry buildings using reinforcement strip

In a masonry building, by inserting a reinforcement strip into a vertical groove formed by cutting a masonry wall in communication with a vertical joint in a masonry building and then filling it with a filler to reinforce it, it minimizes damage to the existing building and enables work in a residential state while resisting lateral force It is about a method of earthquake-resistant reinforcement of a masonry building that can increase the

According to a 2015 report by the Research Center for Structural Safety Improvement Technology, there are about 3 million small-scale masonry buildings in Korea, of which 1.43 million are aged over 30 years.

These small-scale masonry buildings are not usually based on structural design by structural experts, and structural stability is concerned due to frequent expansion and remodeling. As a result of the actual experiment, the shear stress performance of the masonry was only around 0.1 MPa, so it was confirmed that the resistance to lateral force was extremely weak.

Accordingly, various technologies have been developed for seismic reinforcement of aging small-scale masonry buildings.

For example, the RC reinforcement method has excellent reinforcement performance and is advantageous in securing integrity with the masonry structure. However, reinforcing reinforcement and formwork installation process are required, workability is poor due to wet construction, and it takes a lot of time for concrete curing, which causes great inconvenience to residents.

And unlike the laboratory conditions, the reinforcement plate attachment method of attaching FRP or steel plate to the outside of a masonry wall may cause the reinforcement plate to fall off due to deterioration of the wall surface and heterogeneity of material when applied to an actual masonry building. In addition, the difficulty of construction is high, and the field applicability is poor.

In addition, there are fiber reinforcement method, honeycomb seismic reinforcement method, and metal lath + steel plate reinforcement method. However, this existing reinforcement method corresponds to a method of removing the masonry stucco and directly reinforcing the inner wall of the stucco, and it is inconvenient to remove all the chimney bricks.

In addition, these conventional construction methods require a lot of construction cost, so there is a limit to full application to an aging small-scale masonry building.

On the other hand, in conventional masonry buildings, it is common that horizontal joints filled between upper and lower bricks are compressed by the load of the upper bricks to be constructed tightly. On the other hand, vertical joints are often not tightly filled. Accordingly, when a lateral force is applied, the entire masonry wall cannot act as a single structure, which may indicate structural weakness.

KR 10-1904204 B1

In order to solve the above problems, the present invention is to provide a method for earthquake-resistant reinforcement of a masonry building using a reinforcement strip that is economical, short-lived, and easy to construct because it is low-cost and can be reinforced in a living state.

An object of the present invention is to provide a method for earthquake-resistant reinforcement of a masonry building using a reinforcement strip capable of increasing the resistance to lateral force and preventing the masonry wall from collapsing by reinforcing structurally weak vertical joints so that the masonry wall behaves integrally.

The present invention according to a preferred embodiment is for earthquake-resistant reinforcement of an aging existing masonry building, (a) cutting the masonry wall so as to communicate vertically with a vertical joint selected from among the vertical joints of the masonry wall in a masonry wall in which upper and lower rows of bricks are stacked alternately forming a plurality of rows of vertical grooves; (b) inserting a reinforcement strip into the vertical groove; and (c) fixing the reinforcing strip by filling a filler between the vertical groove and the reinforcing strip; It provides a seismic reinforcement method of a masonry building using a reinforcement strip, characterized in that it consists of.

In the present invention according to another preferred embodiment, in the step (a), some or all of the bricks cut after forming the vertical groove are removed, and in the step (c), the mortar is filled in the space from which the bricks are removed. It provides a method for earthquake-resistant reinforcement of a masonry building using a reinforcement strip, characterized in that.

The present invention according to another preferred embodiment provides a method for earthquake-resistant reinforcement of a masonry building using a reinforcement strip, wherein the vertical groove and the reinforcement strip are respectively installed on both sides of the opening of the masonry wall.

In the present invention according to another preferred embodiment, in step (a), horizontal grooves are formed in the upper and lower portions of the opening of the masonry wall by removing horizontal joints between both vertical grooves, and in step (b), in the horizontal groove A reinforcing strip is inserted, and in the step (c), a filler material is filled between the horizontal groove and the reinforcing strip.

According to the present invention, there are the following effects.

First, by inserting a reinforcement strip into the vertical groove formed by cutting the masonry wall in communication with the vertical joint in the masonry building, and then filling it with filler to reinforce it, the entire masonry wall can behave integrally according to the reinforcement of the structurally weak vertical joint, so that the lateral force It is possible to provide a seismic reinforcement method of a masonry building using a reinforcing strip with significantly improved resistance to masonry.

Second, it is possible to minimize damage to the existing building by cutting the joints of the masonry wall from the outside of the building. can

1 is a perspective view showing a masonry wall cutting process for forming a vertical groove.
Figure 2 is a perspective view showing a state in which a vertical groove is formed.
Figure 3 is a perspective view showing the installation process of the reinforcement strip.
Figure 4 is an enlarged view of the portion A of Figure 3;
5 is a perspective view showing a state in which the cut bricks are removed.
6 is a perspective view showing a state in which the mortar is filled in the space from which the bricks are removed.
Fig. 7 is a perspective view showing the reinforcement process around the opening;
Fig. 8 is an elevation view showing a state in which the periphery of the opening is reinforced;

Hereinafter, the present invention will be described in detail according to the accompanying drawings and preferred embodiments.

1 is a perspective view illustrating a masonry wall cutting process for forming a vertical groove, and FIG. 2 is a perspective view illustrating a state in which the vertical groove is formed. And Figure 3 is a perspective view showing the installation process of the reinforcing strip, Figure 4 is an enlarged view of the portion A of Figure 3 .

1 to 4, the earthquake-resistant reinforcement method of a masonry building using the reinforcement strip of the present invention is for earthquake-resistant reinforcement of an aging existing masonry building, forming a plurality of rows of vertical grooves 12 by cutting the masonry wall 1 so as to vertically communicate with the vertical joints 11 selected from among the vertical joints 11 of the masonry wall 1 in ); (b) inserting a reinforcement strip (2) into the vertical groove (12); And (c) fixing the reinforcement strip (2) by filling the filler (3) between the vertical groove (12) and the reinforcement strip (2); It is characterized in that it is composed of

An object of the present invention is to provide a method for earthquake-resistant reinforcement of a masonry building using a reinforcement strip that is economical, short-lived, and easy to construct because it is low-cost and can be reinforced in a living state.

In addition, the present invention enhances resistance to lateral force by reinforcing the vertical joints 11 of structurally weak masonry buildings so that the entire masonry wall 1 behaves integrally, using a reinforcement strip that can prevent the collapse of the masonry wall 1 It is intended to provide a method for earthquake-resistant reinforcement of masonry buildings.

In the present invention, first, (a) the masonry wall 1 is cut so that it communicates vertically with the vertical joints 11 selected among the vertical joints 11 of the masonry wall 1 in the masonry wall 1 in which the bricks in the upper and lower rows are stacked alternately. A plurality of rows of vertical grooves 12 are formed.

That is, in order to reinforce the structurally weak vertical joint 11 , the vertical groove 12 is formed by cutting the masonry wall 1 vertically based on the selected vertical joint 11 .

In general, the masonry wall 1 is laminated in a stacking method in which upper bricks and lower bricks are crossed and stacked.

Accordingly, the vertical joints 11 are also arranged so that the upper and lower bricks are alternated with each other.

Therefore, the vertical joint 11 is removed from the layer where the vertical joint 11 is located with respect to the selected vertical joint 11 column as in FIG. 1, and the center of the brick is cut with a cutter, etc. Vertical grooves 12 are formed vertically and continuously as shown.

At this time, since half of the vertical groove 12 is formed in the vertical joint 11 portion, the cutting operation can be performed quickly.

In a masonry building, when the heat insulating material 4 is disposed on the back side of the front decorative brick, the vertical groove 12 may be formed to extend to a part of the front side of the heat insulating material 4 (FIG. 4).

The vertical groove 12 may be formed in a plurality of rows. The adjacent vertical grooves 12 may be spaced in consideration of the width or height of the masonry wall 1 or the magnitude of the lateral force.

Next, (b) insert the reinforcement strip (2) into the vertical groove (12) (FIG. 3).

A reinforcing strip 2 is inserted into the vertical groove 12 formed to communicate vertically.

The reinforcing strip 2 is a thin band-shaped member, and may be composed of a steel band plate, synthetic resin, or the like.

However, it is preferable that the reinforcing strip 2 is made of a fiber reinforced polymer (FRP) that is lightweight, can express high strength, and has excellent corrosion resistance.

Then, (c) filling the filler 3 between the vertical groove 12 and the reinforcing strip 2 to fix the reinforcing strip 2 (FIG. 4).

The reinforcement strip 2 can be fixed by filling and curing the filler 3 in the vertical groove 12 into which the reinforcement strip 2 is inserted.

As the filler 3, it is possible to use fiber-reinforced mortar (FRM) or epoxy, which has excellent tensile strength, shear strength, and ductility.

The in-plane and out-of-plane resistance of the stucco brick is improved by the reinforcement strip 2 and the filler 3, and the bricks can be integrated with each other to form a structural wall.

Since the present invention is constructed by cutting the joints of the masonry wall 1 from the outside of the masonry building, damage to the existing building can be minimized. In addition, it is convenient because it is low-cost and has little impact on the lives of residents during construction, so it is possible to work while living.

5 is a perspective view illustrating a state in which the cut bricks are removed, and FIG. 6 is a perspective view illustrating a state in which mortar is filled in the space from which the bricks are removed.

5 and 6, in step (a), some or all of the bricks cut after forming the vertical groove 12 are removed, and in step (c), the space from which the bricks are removed ( It can be configured so that the mortar (M) is filled in S).

As shown in FIG. 5 , in step (a), the bricks of the layer from which only the vertical joint 11 portion is removed remain as they are, and the bricks in which the central portion located on the retained bricks are cut can be removed.

In some cases, among the cut bricks, the structurally good bricks remain intact, and only the poorly cut or damaged bricks may be removed.

Thereafter, as in FIG. 6 , in step (c), the mortar M may be used in the space S formed by the removed bricks.

When the vertical groove 12 is filled with the fiber-reinforced mortar (FRM) with the filler 3, the mortar M that is used in the space S from which the bricks are removed is also made of the same material as the filler 3, FRM. It can be filled at the same time when filling the filler (3) by using it.

Accordingly, the reinforcing strip 2 and the matched mortar M can form one structural reinforcing member, and the reinforcing member is more stably integrated with the surrounding bricks to reinforce the masonry wall 1 .

7 is a perspective view illustrating a reinforcement process around the opening, and FIG. 8 is an elevation view showing a reinforced state around the opening.

7 and 8 , the vertical groove 12 and the reinforcing strip 2 may be respectively installed on both sides of the opening 10 of the masonry wall 1 .

In the masonry building, the periphery of the opening 10 is structurally weak.

Accordingly, the reinforcement strip 2 may be installed around the opening 10 to reinforce the opening 10 together with the entire masonry wall 1 .

In addition, the masonry wall 1 can be divided into an opening area and a non-opening area by the vertical groove 12 and the reinforcing strip 2 . Therefore, even if partial damage occurs in the masonry wall 1 of the opening 10 by the lateral force, it does not expand to the surrounding area, and thus the extent of damage can be minimized.

7 and 8, in the step (a), the horizontal grooves 14 are removed by removing the horizontal joints 13 between the vertical grooves 12 on both sides in the upper and lower portions of the opening 10 of the masonry wall 1 . ) are respectively formed, and in step (b), the reinforcing strip 2 is inserted into the horizontal groove 14, and in step (c), between the horizontal groove 14 and the reinforcing strip 2 It can be configured to be filled with the filler (3).

When the opening 10 is provided in the masonry wall 1, not only the left and right sides of the opening 10, but also the upper and lower portions may be reinforced with the reinforcing strips 2 to resist lateral force.

At this time, the horizontal groove 14 formed to insert the reinforcement strip 2 in the horizontal direction may be formed by removing the horizontal joint 13 between the upper and lower bricks. Therefore, it does not damage the existing bricks at all.

In this way, when the periphery of the opening 10 is wrapped and reinforced in the horizontal and vertical directions, the seismic performance of the wall having the opening 10 can be greatly improved.

1: masonry wall
10: opening
11: vertical joint
12: vertical groove
13: horizontal joint
14: horizontal groove
2: reinforcement strip
3: Filling
4: Insulation
M: mortar
S: space

Claims (4)

It is to reinforce the earthquake resistance of the aging existing masonry building,
(a) In the masonry wall (1) in which the upper and lower rows of bricks are stacked alternately, the masonry wall (1) is cut so as to communicate vertically with the vertical joint (11) selected among the vertical joints (11) of the masonry wall (1) to form a plurality of vertical grooves ( 12) forming;
(b) inserting the reinforcement strip (2) into the vertical groove (12); and
(c) fixing the reinforcement strip (2) by filling the filler (3) between the vertical groove (12) and the reinforcement strip (2); Seismic reinforcement method of a masonry building using a reinforcement strip, characterized in that it consists of.
In claim 1,
In step (a), some or all of the bricks cut after forming the vertical groove 12 are removed,
In the step (c), the seismic reinforcement method of a masonry building using a reinforcement strip, characterized in that the mortar (M) is filled in the space (S) from which the bricks are removed.
In claim 1,
The vertical groove (12) and the reinforcing strip (2) are each constructed on both sides of the opening (10) of the masonry wall (1).
In claim 3,
In the step (a), horizontal grooves 14 are respectively formed in the upper and lower portions of the openings 10 of the masonry wall 1 by removing the horizontal joints 13 between the vertical grooves 12 on both sides,
In the step (b), the reinforcement strip (2) is inserted into the horizontal groove (14),
In the step (c), the seismic reinforcement method of a masonry building using a reinforcement strip, characterized in that the filler (3) is filled between the horizontal groove (14) and the reinforcement strip (2).

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