JP7755078B2 - PC reinforcement block assembly for earthquake resistance reinforcement and its construction method - Google Patents

Description

This invention relates to a PC reinforcement block assembly for seismic reinforcement, and its construction method. Internal reinforcement bars are inserted into the hollow spaces of PC reinforcement block units that are layered on the exterior of existing structural members or inside structures, and then filled with filler. This assembly is easy to install, does not require separate fire-resistant coating, and can reinforce the axial force of components.

Recently, the frequency and magnitude of earthquakes have increased in Korea, resulting in increased damage to buildings and people. In particular, buildings constructed before 1988, when earthquake-resistant design was introduced for buildings six stories or more, are still in use, while many small buildings with two stories or more or a total floor area of ^200m2 or more were constructed before 2017, when the scope of application of earthquake-resistant design was expanded, and so earthquake-resistant design is not applied. As a result, there is a high demand for earthquake reinforcement for these buildings.

In the past, methods commonly used to reinforce reinforced concrete members against earthquakes included the cross-section expansion method, in which rebar was placed around the existing member and concrete was poured to add cross section, and the steel plate attachment method, in which steel plates were attached around the existing member to encase it.

However, the cross-section expansion method requires temporary construction work, such as setting up and dismantling formwork on-site, and requires a period of time for pouring and curing the additional concrete, which not only makes it less workable but also lengthens the construction period.

Furthermore, the steel plate installation method requires on-site welding, and there is a risk of fire due to hot work, so an additional process of fire-resistant coating of the steel plate is required.

To address these issues, a technology has been proposed in which reinforced panels made by bending high-strength steel plates and filling them with fillers such as epoxy mortar or polymer mortar are fastened to existing components with anchor bolts (Korean Patent Registration No. 10-1672924).

However, the registered technology requires high-strength steel plates to be bent and shaped, which inevitably increases manufacturing costs. Furthermore, because the steel plates are exposed to the outside, a separate fire-resistant paint coating must be applied to the outside of the steel plates. Furthermore, it requires constant maintenance work to prevent corrosion, and separate exterior finishing work is required, which is a hassle.

In addition, reinforcing bands must be fastened to unite the divided reinforcing panels, but in this case, the protruding reinforcing bands make it difficult to use and mar the appearance. To omit these reinforcing bands, the reinforcing panels must be fastened together by on-site welding, which makes it difficult to ensure uniform quality, is greatly affected by on-site conditions such as weather, and raises the risk of fire due to hot work.

In addition, Korean Patent No. 10-2306103 was developed to address the issues with conventional steel plate reinforcement methods.

The registered technology involves installing multiple PC reinforcement panel units on existing concrete members that lack sufficient strength, and then connecting each PC reinforcement panel unit with connectors to reinforce them. This makes the production of the reinforcement member easy and economical, and it also offers excellent on-site workability and fire resistance. Furthermore, because multiple PC reinforcement panel units are installed in succession, the PC member's size and weight are small, making it easy to handle and install, and the reinforcement member is unitized, making it easy to apply to members of various sizes.

However, in the registered technology, PC reinforced panel units are joined using connectors that fit into keyways. As a result, the reinforcement members primarily resist the lateral forces, i.e., shear forces, of the member, and there is a limit to how much the member's resistance to axial stress can be increased.

To solve the above problems, the present invention aims to provide a PC reinforcement block assembly for seismic reinforcement that is easy to install, does not require a separate fire-resistant coating, and can reinforce the axial force of members, as well as a construction method for the same.

In a preferred embodiment, the present invention provides a PC reinforcement block assembly for seismic reinforcement, which is intended to reinforce existing reinforced concrete members and comprises a rectangular parallelepiped unit body, an upward extension formed above the unit body and protruding to one side, and a downward extension formed below the unit body and protruding to the other side; multiple PC reinforcement block units each having a hollow penetrating longitudinally and stacked so as to fit together vertically and horizontally; internal reinforcement bars that penetrate the hollows of the multiple PC reinforcement block units stacked vertically; and filler material that fills the hollows of the multiple PC reinforcement block units.

In another preferred embodiment, the present invention provides a PC reinforcement block assembly for seismic reinforcement, characterized in that a first receiving groove is formed in at least one of the outer surfaces of the PC reinforcement block unit in the longitudinal direction of the PC reinforcement block unit, and a plurality of stacked PC reinforcement block units receive a first external reinforcement bar inside the first receiving groove so as to cross the longitudinal direction of the PC reinforcement block unit, and the inside of the first receiving groove is filled with a filler material.

In another preferred embodiment, the present invention provides a PC reinforcement block assembly for seismic reinforcement, characterized in that a second receiving groove is formed in the width direction of the PC reinforcement block unit on at least one of the front and rear surfaces of the PC reinforcement block unit, and horizontally adjacent PC reinforcement block units receive a second external reinforcement bar inside the second receiving groove so as to cross the horizontal direction of the PC reinforcement block unit, and the inside of the second receiving groove is filled with filler material.

In another preferred embodiment, the present invention provides a PC reinforcement block assembly for seismic reinforcement, characterized in that the hollows are formed vertically through the unit main body, the upper extension portion, and the lower extension portion.

In another preferred embodiment, the present invention provides a method for constructing the PC reinforcement block assembly, comprising the steps of: (a) stacking a plurality of PC reinforcement block units on the exterior of an existing member; (b) inserting and installing internal reinforcement bars into the hollows of the plurality of PC reinforcement block units stacked one above the other; and (c) filling the hollows with a filler material.

The present invention provides the following advantages:

First, PC reinforcement block units prefabricated in a factory can be stacked vertically on the outside of existing components so that the hollows are connected, forming a PC reinforcement block assembly. This ensures excellent fire resistance by using non-combustible precast concrete blocks, eliminating the need for separate fire-resistant coating.

Secondly, construction is simple because the hollow space into which the internal reinforcing bar is inserted is filled with filler material to integrate the internal reinforcing bar and the PC reinforcing block unit. Furthermore, since multiple PC reinforcing block units are lined up in a continuous row in the longitudinal direction, they resist not only compressive forces but also shear forces and bending moments, increasing the strength of the members against not only axial forces but also lateral forces, thereby demonstrating excellent seismic performance.

FIG. 1 is a perspective view showing an embodiment of a PC reinforcing block unit. FIG. 1 is a perspective view showing a PC reinforcement block assembly installed on the outside of an existing column member. This is a cross-sectional view showing a PC reinforcing block unit connected to one side of an existing pillar member. This is a cross-sectional view showing a PC reinforcing block unit connected to one side of an existing pillar member. 1 is a cross-sectional view showing the connection state of PC reinforcement block units having various cross sections and hollows. 1 is a cross-sectional view showing the connection state of PC reinforcement block units having various cross sections and hollows. 1 is a cross-sectional view showing the connection state of PC reinforcement block units having various cross sections and hollows. 1 is a cross-sectional view showing the connection state of PC reinforcement block units having various cross sections and hollows. 1 is a perspective view showing a PC reinforcement block assembly placed at a distance from an existing column member. FIG. A cross-sectional view showing an L-shaped PC reinforcement block unit connected to an existing beam member. 10 is a cross-sectional view showing a state in which a first external reinforcement bar is installed in a first receiving groove portion. FIG. FIG. 10 is a perspective view showing another embodiment of the PC reinforcing block unit. FIG. 1 is a perspective view showing an embodiment in which the PC reinforcement block assembly is a load-bearing wall. FIG. 10 is a perspective view showing a Z-shaped PC reinforcement block unit. FIG. 15 is a perspective view showing a PC reinforcement block assembly using the PC reinforcement block unit shown in FIG. 14. 16 is a cross-sectional view showing the state in which an internal reinforcing bar is installed in the PC reinforcing block assembly shown in FIG. 15. FIG. This is an oblique view showing a PC reinforcement block unit that is convex on top and concave on the bottom. FIG. 18 is a perspective view showing a PC reinforcement block assembly using the PC reinforcement block unit of FIG. 17. 10 is a perspective view showing another embodiment of a PC reinforcement block unit that is convex on top and concave on the bottom. FIG. FIG. 20 is a perspective view showing a PC reinforcement block assembly using the PC reinforcement block unit of FIG. 19. FIG. 10 is a perspective view showing another embodiment of a PC reinforcement block unit for shear wall reinforcement. FIG. 22 is a perspective view showing a PC reinforcement block assembly using the PC reinforcement block unit of FIG. 21.

In order to achieve the above-mentioned objectives, the PC reinforcement block assembly for earthquake-resistant reinforcement of the present invention is intended to reinforce existing reinforced concrete members, and is characterized in that it comprises a rectangular parallelepiped unit body, an upward extension formed above the unit body and protruding to one side, and a downward extension formed below the unit body and protruding to the other side, and is composed of a plurality of PC reinforcement block units that have a hollow penetrating longitudinally and are stacked so as to fit together vertically and horizontally, an internal reinforcement bar that penetrates the hollows of the plurality of PC reinforcement block units stacked vertically, and a filler material that fills the hollows of the plurality of PC reinforcement block units.

The present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

Figure 1 is a perspective view showing an embodiment of a PC reinforcement block unit, Figure 2 is a perspective view showing a PC reinforcement block assembly installed outside an existing pillar member, and Figures 3 and 4 are cross-sectional views showing a PC reinforcement block unit attached to one side of an existing pillar member. Figures 5 to 8 are cross-sectional views showing the attached state of PC reinforcement block units with various cross-sections and hollows, and Figure 9 is a perspective view showing a PC reinforcement block assembly placed at a distance from an existing pillar member.

As shown in Figures 1 to 9, the PC reinforcement block assembly for earthquake-resistant reinforcement of the present invention is intended to reinforce existing reinforced concrete members 1a, 1b, and 1c, and is characterized by comprising a plurality of PC reinforcement block units 2 stacked one above the other and having a hollow 20 penetrating longitudinally therethrough, an internal reinforcement bar 3 that penetrates the hollows 20 of the plurality of PC reinforcement block units 2 stacked one above the other, and a filler material 4 that fills the hollows 20 of the plurality of PC reinforcement block units 2.

The present invention aims to provide a PC reinforcement block assembly for seismic reinforcement that is easy to install, does not require a separate fire-resistant coating, and can reinforce the axial force of components, as well as a construction method for the same.

The PC reinforcement block assembly for seismic reinforcement of the present invention is attached to one side of an existing reinforced concrete member that requires seismic reinforcement, or it is wrapped around the entire outer surface of the member to reinforce it.

The PC reinforcement block assembly for seismic reinforcement comprises a PC reinforcement block unit 2, an internal reinforcement bar 3, and a filler material 4.

The PC reinforcement block unit 2 may be a precast concrete block manufactured in advance in a factory, with reinforcing bars or a reinforcing bar mesh arranged inside. Alternatively, the PC reinforcement block unit 2 may be made of high-strength precast concrete or UHPC, which has excellent strength and ductility.

Precast concrete blocks are non-combustible materials, have excellent fire resistance, and are not susceptible to corrosion, eliminating the need for separate fireproofing or corrosion prevention treatments. Furthermore, they are factory-produced with excellent finish quality, allowing them to be used as a final finish.

The PC reinforcement block unit 2 has a hollow 20 formed inside that runs through the member in the longitudinal direction, and multiple units are stacked one on top of the other.

The PC reinforcement block units 2 that make up the PC reinforcement block assembly are provided in multiple pieces along the length and/or width of the existing components 1a, 1b, and 1c, and are installed in close contact with or spaced apart from the existing components 1a, 1b, and 1c.

The hollow 20 reduces the weight of the PC reinforcement block unit 2, thereby reducing the lifting load.

The hollow 20 can be formed in various cross-sectional shapes, such as circular, elliptical, or polygonal. Furthermore, one or more hollows 20 can be formed depending on the size and shape of the PC reinforcement block unit 2.

Figures 3 and 4 show a PC reinforcing block unit 2 connected to one side of an existing column 1a, and Figures 3 and 4 show embodiments with one elliptical cavity 20 and two circular cavities 20, respectively.

Multiple PC reinforcement block units 2 are stacked one on top of the other so that the hollows 20 formed inside them are connected to each other.

The internal reinforcement bar 3 is installed by penetrating the hollow 20 of multiple PC reinforcement block units 2 stacked one above the other.

In other words, the internal reinforcement bar 3 is inserted and installed inside the interconnected hollows 20 of the vertically stacked PC reinforcement block units 2.

The internal reinforcement bar 3 is installed across the entire height of the PC reinforcement block assembly formed by stacking multiple PC reinforcement block units 2.

The internal reinforcing bar 3 is a rod-shaped member capable of transmitting axial force (compression or tension) acting on the assembly, and can be made of reinforcing bars, steel rods, etc.

The filler material 4 is filled into the hollows 20 of multiple PC reinforcement block units 2.

The filler material 4 is filled into the hollow 20 into which the internal reinforcing bar 3 is inserted, integrating the internal reinforcing bar 3 with the PC reinforcing block unit 2. Furthermore, the filler material 4 connects the separated PC reinforcing block units 2 in the longitudinal direction, enabling them to resist not only compressive forces but also shear forces and bending moments.

This increases the member's resistance to axial stress and lateral force, enabling it to exhibit excellent seismic performance.

The filler 4 may be non-shrinking mortar, etc.

If the existing member is a column 1a, the PC reinforcing block assembly may be installed on each face of the existing column 1a (Figure 2), or may be installed only on the front face of the existing column 1a (Figures 3 to 8).

If the PC reinforcement block assembly is installed only on the front of the existing column 1a, the rear side can be formed to be the same width as the front of the existing column 1a to ensure sufficient cross-sectional area, and the front side can be formed to have an expanded cross-section.

Figures 5 and 6 show an embodiment in which the cross section of the front side of the PC reinforcement block assembly is gradually enlarged. Figures 7 and 8 show an embodiment in which the cross section of the front side of the PC reinforcement block assembly is enlarged in a T-shape.

If the existing component is a beam 1b, a PC reinforcement block unit 2 can be installed on each of the three surfaces of the existing beam 1b: both side surfaces and the underside (Figure 10).

Also, if the existing component is a wall, a PC reinforcement block assembly can be installed on the front surface of the existing wall.

When reinforcing the existing members 1a, 1b, and 1c by expanding their cross sections, the PC reinforcement block assembly can be installed at a distance from the existing members 1a, 1b, and 1c. Concrete C or non-shrink mortar can then be poured into the space between the PC reinforcement block assembly and the existing members 1a, 1b, and 1c (Figure 9). In this case, the PC reinforcement block assembly simultaneously functions as both a formwork and a member reinforcement.

Figure 10 is a cross-sectional view showing an L-shaped PC reinforcement block unit connected to an existing beam member.

As shown in Figures 1, 3, 10, etc., the PC reinforcement block unit 2 has anchor holes 21 formed through it in the horizontal direction, and can be fixed to one side of existing members 1a, 1b, and 1c by anchor members 5 that pass through the anchor holes 21.

The PC reinforcement block unit 2 can be fixed to existing members 1a, 1b, and 1c using at least one post-installed anchor.

For this purpose, at least one anchor hole 21 may be formed in the PC reinforcement block unit 2. Then, anchor fixing holes (not shown) may be drilled on-site in the existing members 1a, 1b, and 1c at positions corresponding to the anchor holes 21.

An anchor receiving groove 22 may be formed on the outside of the anchor hole 21 to receive the end protrusion of the anchor member 5 and a fixing nut 51 for fixing the anchor member 5.

After the anchor member 5 has been installed, the inside of the anchor receiving groove 22 can be filled with non-shrink mortar M or epoxy.

As shown in Figure 3, the PC reinforcement block unit 2 is formed with a straight cross section, and the PC reinforcement block unit 2 can be attached to each face of the existing members 1a, 1b, and 1c.

Also, as shown in Figure 10, the PC reinforcement block unit 2 may be L-shaped, with the corners bent to surround the corners of the existing members 1a, 1b, and 1c. In this case, by effectively restraining the corners of the existing members 1a, 1b, and 1c, the strength and ductility of the existing members 1a, 1b, and 1c located inside can be increased when a compressive force is applied.

Figure 11 is a cross-sectional view showing the first external reinforcement bar installed in the first accommodating groove.

As shown in FIG. 11, a first accommodating groove 23 is formed in the longitudinal direction of the PC reinforcement block unit 2 on at least one of the outer surfaces of the PC reinforcement block unit 2, and in multiple stacked PC reinforcement block units 2, a first external reinforcement bar 6 is accommodated inside the first accommodating groove 23 so as to cross the longitudinal direction of the PC reinforcement block unit 2, and a filler material 4 can be filled inside the first accommodating groove 23.

The internal reinforcement bar 3 is installed in a hollow 20 formed inside the PC reinforcement block unit 2, so its position is close to the neutral axis, limiting its bending rigidity.

Therefore, a first external reinforcement bar 6 can be installed on the outside of the PC reinforcement block assembly, extending continuously in the longitudinal direction of the PC reinforcement block assembly.

For this reason, a first storage groove portion 23 is formed on the front surface of the PC reinforcement block unit 2 in the longitudinal direction of the PC reinforcement block unit 2, i.e., in the longitudinal direction of the existing components 1a, 1b, and 1c, and the first storage groove portions 23 of adjacent PC reinforcement block units 2 in the longitudinal direction are configured to communicate with each other.

The first external reinforcement bar 6, which crosses multiple PC reinforcement block units 2 in the longitudinal direction of the member, is housed inside the first housing groove 23, which is continuous in the longitudinal direction of the member.

The first external reinforcement bar 6 is a rod-shaped member such as a reinforcing bar or steel rod that can transmit axial force.

The filler 4 filled inside the first receiving groove 23 may be epoxy putty, non-shrink mortar, etc.

Epoxy putty is a putty based on epoxy resin, characterized by the high strength of epoxy resin. This epoxy putty strengthens the adhesive strength with the first receiving groove portion 23, effectively transmitting stress between the first external reinforcement bar 6 and the PC reinforcement block unit 2.

Figure 12 is a perspective view showing another embodiment of a PC reinforcement block unit, and Figure 13 is a perspective view showing an embodiment in which the PC reinforcement block assembly is a load-bearing wall.

As shown in Figure 13, the PC reinforcement block assembly can be constructed by stacking multiple PC reinforcement block units 2 vertically and horizontally to form a load-bearing wall.

The PC reinforcement block assembly can be installed between existing columns 1a in the form of a filler wall to reinforce existing structures.

For this reason, multiple PC reinforcement block units 2 stacked one above the other can be connected in multiple rows horizontally to form a load-bearing wall.

This allows existing rigid-frame structural frames consisting of columns and beams to be reinforced.

As shown in Figures 12 and 13, a second accommodating groove 24 is formed in the width direction of the PC reinforcement block unit 2 on at least one of the front and rear surfaces of the PC reinforcement block unit 2, and horizontally adjacent PC reinforcement block units 2 have a second external reinforcement bar 7 accommodated within the second accommodating groove 24 so as to cross the horizontal direction of the PC reinforcement block unit 2, and the second accommodating groove 24 can be filled with filler material 4.

When the PC reinforcement block assembly is constructed as a bearing wall, multiple rows of PC reinforcement block units 2 must be integrated horizontally.

However, when constructing a PC reinforcement block assembly, which serves as a load-bearing wall, in the form of an infill wall between a pair of columns, interference between the left and right columns makes it difficult to install reinforcing bars, such as steel bars, penetrating laterally adjacent PC reinforcement block units 2.

Therefore, a second accommodation groove 24 can be formed horizontally (widthwise) on the front and/or back of the PC reinforcement block unit 2 so as to connect with adjacent PC reinforcement block units 2, and after a second external reinforcement bar 7 is installed inside the second accommodation groove 24, filler material 4 can be filled in to integrate horizontally adjacent PC reinforcement block units 2.

The second external reinforcement bar 7 can be installed outside the PC reinforcement block assembly after the PC reinforcement block unit 2 has been installed, so it can be installed without interference from external components such as pillars.

When the first and second accommodating grooves 23 and 24 are simultaneously formed on the outer surface of the PC reinforcement block unit 2, the depths of the accommodating grooves 23 and 24 can be made different from each other to prevent the vertical first external reinforcement bar 6 and the horizontal second external reinforcement bar 7 inserted into the accommodating grooves 23 and 24 from interfering with each other.

Figure 14 is a perspective view showing a Z-shaped PC reinforcement block unit, and Figure 15 is a perspective view showing a PC reinforcement block assembly using the PC reinforcement block unit shown in Figure 14.

As shown in Figures 14 and 15, the PC reinforcement block unit 2 is composed of a rectangular parallelepiped unit main body 2a, an upward extension portion 2b formed on one side above the unit main body 2a, and a downward extension portion 2c formed on the other side below the unit main body 2a, and the upper, lower, left, and right PC reinforcement block units 2 are assembled by fitting them together in close contact.

The PC reinforcement block units 2, which are stacked vertically and horizontally to form the PC reinforcement block assembly, can be bent and configured to fit together so that they are firmly connected to adjacent PC reinforcement block units 2.

Specifically, the PC reinforcement block unit 2 is composed of a unit main body 2a and an upper extension portion 2b and a lower extension portion 2c that protrude in opposite directions above and below the unit main body 2a, respectively, so that the lower portion on one side and the upper portion on the other side can be formed in a stepped Z-shape.

The stepped portions of the PC reinforcement block units 2 fit into the corresponding stepped portions of adjacent PC reinforcement block units 2, resulting in a tight and secure assembly in both the up, down, left, and right directions.

The Z-shaped PC reinforcement block unit 2 may also have a first receiving groove 23 and/or a second receiving groove 24 formed on the front and/or back surfaces, and each receiving groove 23, 24 may be provided with a first external reinforcement bar 6 and/or a second external reinforcement bar 7, which may be filled with filler material 4.

Figure 16 is a cross-sectional view showing the PC reinforcement block assembly shown in Figure 15 with an internal reinforcement bar installed.

As shown in Figure 16, the hollow 20 can be formed vertically through the unit main body 2a, the upper extension portion 2b, and the lower extension portion 2c.

When the PC reinforcement block unit 2 is formed in a Z-shape so that the stepped portions fit together with adjacent PC reinforcement block units 2, hollows 20 can be formed in the unit body 2a and the upper and lower extensions 2b, 2c to firmly connect with the surrounding PC reinforcement block units 2 adjacent to each other on the top, bottom, left, and right, and an internal reinforcement bar 3 can be installed through each hollow 20.

As a result, each PC reinforcement block unit 2 is interconnected with five other PC reinforcement block units 2 arranged around it. In other words, a total of six adjacent PC reinforcement block units 2 are interconnected and firmly integrated.

Figure 17 is a perspective view showing a PC reinforcement block unit that is convex on top and concave on the bottom, and Figure 18 is a perspective view showing a PC reinforcement block assembly using the PC reinforcement block unit of Figure 17. Figure 19 is a perspective view showing another embodiment of a PC reinforcement block unit that is convex on top and concave on the bottom, and Figure 20 is a perspective view showing a PC reinforcement block assembly using the PC reinforcement block unit of Figure 19.

As shown in Figures 17 to 20, the PC reinforcement block unit 2 can be configured so that the upper portion is formed in a convex shape and the lower portion is formed in a concave shape corresponding to the upper portion, and the upper portion of the lower PC reinforcement block unit 2 is inserted into and fitted into the lower portion of the upper PC reinforcement block unit 2.

The upper part of the PC reinforcement block unit 2 can be formed convexly and the lower part can be formed concavely so that the PC reinforcement block units 2 stacked one above the other can be firmly connected to each other and the shear force of the PC reinforcement block unit 2 itself can resist lateral forces at the joints.

In this case, the upper and lower parts of the PC reinforcement block unit 2 can be formed in corresponding shapes. When the PC reinforcement block units 2 are stacked, the lower PC reinforcement block unit 2 can be inserted below the upper PC reinforcement block unit 2, and they can be fitted together to form a firm joint.

To this end, as shown in Figures 17 and 18, a protrusion 25 may be formed at the center of the upper part of the PC reinforcement block unit 2, and a groove 26 of a shape corresponding to the protrusion 25 may be formed at the lower part.

As a result, when a lateral force acts, the joint between the upper and lower PC reinforcement block units 2 can resist the lateral force through the shear force of the cross section of the protrusion 25.

Alternatively, as shown in Figures 19 and 20, the upper and lower parts of the PC reinforcement block unit 2 can be formed into a wedge shape so that they correspond to each other.

In this case, the upper inclined surface of the lower PC reinforcement block unit 2 and the lower inclined surface of the upper PC reinforcement block unit 2 can accurately align the positions of the upper and lower PC reinforcement block units 2.

Figure 21 is a perspective view showing another embodiment of a PC reinforcement block unit for reinforcing the front end wall, and Figure 22 is a perspective view showing a PC reinforcement block assembly using the PC reinforcement block unit of Figure 21.

As shown in Figure 22, if the existing member 1C is a front end wall, PC reinforcement block units 2 can be stacked and installed on the front surface of the front end wall and secured with anchor members 5.

The anchor hole 21 for fastening the anchor member 5 can be formed inside the first receiving groove portion 23 or the second receiving groove portion 24.

The first and second external reinforcement bars 6 and 7 are arranged in the first and second accommodating grooves 23 and 24, respectively.

The method for constructing a PC reinforcement block assembly of the present invention relates to the method for constructing a PC reinforcement block assembly of the present invention described above with reference to Figures 1 to 20.

In the construction method for a PC reinforcement block assembly of the present invention, first, (a) multiple PC reinforcement block units 2 are stacked on the outside of existing members 1a, 1b, and 1c.

When the PC reinforcement block unit 2 is to be installed closely against existing members 1a, 1b, and 1c, the primer paint and foreign matter from the existing members 1a, 1b, and 1c are removed and the surfaces are cleaned. In some cases, deteriorated covering concrete on the surfaces of the existing members 1a, 1b, and 1c can also be removed.

When using the anchor members 5 to secure the PC reinforcement block unit 2 to existing members 1a, 1b, and 1c, anchor fixing holes can be pre-drilled at the locations where the anchor members 5 are to be installed.

The PC reinforcement block units 2 are installed in series on the outer surfaces of the existing components 1a, 1b, and 1c in the longitudinal direction of the components. At this time, multiple PC reinforcement block units 2 stacked one on top of the other are stacked so that the hollows 20 are connected to each other vertically.

The PC reinforcement block unit 2 may encase only a portion of the surfaces of the existing members 1a, 1b, and 1c, or may encase the entire existing members 1a, 1b, and 1c, depending on the purpose or extent of reinforcement of the existing members 1a, 1b, and 1c.

Anchor members 5 can be inserted through anchor holes 21 formed horizontally through the PC reinforcement block unit 2, and the ends of the anchor members 5 can be inserted into the anchor fixing holes of existing members 1a, 1b, and 1c. Epoxy or the like is injected into the anchor fixing holes to secure the anchor members 5 in place.

After the anchor member 5 is fixed, a fixing nut 51 is tightened to the rear end of the anchor member 5 inside the anchor receiving groove 22 of the PC reinforcement block unit 2 to fix the PC reinforcement block unit 2 to the existing members 1a, 1b, and 1c.

The inside of the anchor receiving groove 22 is filled with non-shrink mortar or epoxy to prevent the rear end of the anchor member 5 from being exposed to the outside air.

Epoxy, non-shrink mortar, concrete, etc. can be injected into the space between the PC reinforcement block unit 2 and the existing components 1a, 1b, and 1c.

Next, (b) insert and install the internal reinforcement bar 3 into the hollow 20 of the multiple PC reinforcement block units 2 stacked one above the other.

That is, after the PC reinforcement block units 2 are stacked and installed, internal reinforcement bars 3, such as reinforcing bars or steel rods, are inserted into the hollows 20 that communicate vertically.

Finally, (c) fill the hollow 20 with filler material 4, such as non-shrink mortar.

This allows the internal reinforcement bar 3 to be fixed inside the hollow 20 and integrated with the PC reinforcement block unit 2, increasing the member's resistance to axial stress and lateral force and providing excellent seismic performance.

The PC reinforcement block assembly for earthquake-resistant reinforcement of the present invention is constructed by stacking pre-fabricated PC reinforcement block units on top of each other in a factory so that the hollows are connected to the outside of existing members. This eliminates the risk of corrosion of the PC reinforcement block units, does not require separate fire-resistant coating, and has industrial applicability in that it is factory-produced and has excellent finish quality.

Claims (5)

It is intended to reinforce existing reinforced concrete members (1a, 1b, 1c),
a plurality of PC reinforcement block units (2) each including a rectangular parallelepiped unit body (2a), an upward extension portion (2b) formed above the unit body and protruding to one side, and a downward extension portion (2c) formed below the unit body and protruding to the other side, the PC reinforcement block units (2) having a hollow (20) penetrating longitudinally therethrough and stacked so as to interlock with each other vertically and horizontally;
An internal reinforcing bar (3) is provided to penetrate the hollow (20) of a plurality of PC reinforcing block units (2) stacked one above the other;
and a filler (4) that fills the hollows (20) of the plurality of PC reinforcing block units (2) ,
The PC reinforcement block assembly for earthquake-resistant reinforcement is characterized in that the upper extension portion (2b) and unit body (2a) of an adjacent PC reinforcement block unit (2) are respectively placed on top of the unit body (2a) and downward extension portion (2c) of the PC reinforcement block unit (2), and adjacent PC reinforcement block units 2 are stacked so that they are shifted relative to each other vertically and interlock with each other . A PC reinforcement block assembly for seismic reinforcement as described in claim 1, characterized in that a first receiving groove (23) is formed in the longitudinal direction of the PC reinforcement block unit (2) on at least one of the outer surfaces of the PC reinforcement block unit (2), and in that multiple stacked PC reinforcement block units (2) have a first external reinforcement bar (6) received within the first receiving groove (23) so as to cross the longitudinal direction of the PC reinforcement block unit (2), and the first receiving groove (23) is filled with filler material (4). 2. The PC reinforcement block assembly for earthquake-resistant reinforcement according to claim 1, wherein a second receiving groove (24) is formed in the width direction of the PC reinforcement block unit (2) on at least one of the front and rear surfaces of the PC reinforcement block unit (2), and horizontally adjacent PC reinforcement block units (2) receive a second external reinforcement bar (7) inside the second receiving groove ( 24 ) so as to cross the horizontal direction of the PC reinforcement block unit (2), and the inside of the second receiving groove (24) is filled with a filler (4). The PC reinforcement block assembly for earthquake-resistant reinforcement described in claim 1, characterized in that the hollow (20) is formed vertically through the unit main body (2a), upper extension portion (2b), and lower extension portion (2c). A method for constructing the PC reinforcement block assembly according to claim 1,
(a) stacking a plurality of PC reinforcement block units (2) on the exterior of existing members (1a, 1b, 1c);
(b) inserting and installing an internal reinforcement bar (3) into the hollow (20) of a plurality of PC reinforcement block units (2) stacked one above the other;
(c) filling the hollow (20) with a filler (4).