KR20130091938A - Strengthening method of reinforced concrete structures using anchored steel plates and wire ropes - Google Patents

Abstract

PURPOSE: A column strength reinforcement method using a fixed-ended steel material and a wire rope is provided to be reinforced by high flowing concrete and to improve transverse strength and axial strength by using a steel material which functions as a main bar. CONSTITUTION: A column strength reinforcement method using a fixed-ended steel material and a wire rope comprises the following steps. Multiple steel materials (10), which have a T shape or an I shape, are install on the surface of a column (5a) or on the groove of the surface of the column in the length direction of the column; and has the bottom ends of the steel materials which are installed on a base (5b). Wire ropes (30,30') are compressed on the column after being installed to wrap around the surface of the steel material, tensing both ends of the wire ropes, and then fastening the wire ropes on the column. High flowing concrete is additionally formed on the periphery of the column for the steel material and the wire ropes to be buried.

Description

STRENGTHENING METHOD OF REINFORCED CONCRETE STRUCTURES USING ANCHORED STEEL PLATES AND WIRE ROPES}

The present invention relates to a method for reinforcing column bearing strength using end-fixed steels and wire ropes. More specifically, by restraining concrete structures such as columnar structures in the lateral direction, it is not only to reinforce the load capacity and ductility of the structure, but also to secure the steel firmly to the structure to improve the transverse strength and axial resistance due to the steel reinforcing effect. It relates to a method of reinforcing the column strength using an end-fixed steel material and a wire rope.

The method mainly used to improve the strength of the conventional reinforced concrete column is a cross-sectional expansion method or the attachment type reinforcement method using carbon fiber and steel sheet.

The cross-sectional expansion method is to install a rebar (bar) on the slab or foundation connected to the upper and lower pillars and install the formwork to cast concrete. This method is a reinforcing bar reinforcement that can be restrained by fixing the reinforcement to the reinforcement The process is very difficult, especially in the case of a column, a corner column, and an outer column connected to a wall, there is a problem that the band reinforcement construction is almost impossible.

In addition, in the case of the attachment type reinforcement method using the carbon fiber and the steel sheet, the linear expansion coefficients of the carbon fiber, the adhesive, and the base material concrete are different, so that the dropout occurs frequently in the long-term behavior, and the external reinforcing materials are difficult to be settled on the upper and lower slabs of the foundation or the pillar. In the case of very low temperature, especially in winter, when the epoxy resin used as an adhesive is very hard to cure and has poor adhesive performance, it is difficult to substantially reinforce the column. Also, the adhesive reinforcement method using carbon fiber and steel sheet is also connected to the wall. In the case of a column, a corner column, and an outer column, there was a problem that the band reinforcing bar was almost impossible.

1A and 1B illustrate a conventional columnar reinforcement device 200 for solving this problem.

The conventional reinforcement device 200, first, the L-shaped angle 210 is installed in the upper and lower longitudinal directions at the four corners of the column 260, the connection bolt 220 or PC steel wire 230 to the angle 210 ) A plurality of fixing end 240 and sliding end 250 to be wrapped around the pillar, tightening or tensioning and fixing the connecting bolt 220 or the PC steel wire 230 in the end of the pillar 260 It is configured to enhance the load capacity.

Thus, compared with the conventional method of attaching an iron plate that simply increases the cross section of the column with an epoxy-like adhesive on the surface of the column or installing the iron plate on the column with anchor bolts, the workability is excellent and the re-tension is possible while being prefabricated. There was an advantage.

However, the reinforcement device 200 is in the binding force of the corner portion of the pillar in the process of binding force as the binding force by the connection bolt 220 or PC steel wire 230 is concentrated on the angle 210 installed only at the edge of the pillar 260 If damaged, there was a problem that the reinforcing effect can not be expected, and because the fixing end 240 and the sliding end 250 must be manufactured as a heavy weight casting, respectively, the larger the height of the column to be reinforced, the predetermined interval up and down Even if the installation with a large amount of fixing stage 240 and the sliding end 250 was installed there was a problem that the construction and economic efficiency may be somewhat reduced.

In particular, the destruction of concrete between the edges under high celebration can not be expected to reinforce the effect, so the construction is more excellent, the need for technology development for efficient reinforcement method such as column structure has emerged.

Although not shown, in order to prevent the destruction of concrete between the corners and provide more efficient binding force, at least a T-shaped or I-type steel sheet member installed in contact with the reinforcement structure is installed at least in the longitudinal direction and is installed on the surface of the reinforcement structure. A structure reinforcement system was developed that includes a steel material including a steel rope and a wire rope that both sides are fixed to each other by an end binding material including an eye bolt and an eye bolt connector while surrounding the steel by a tension force on the surface of the steel. .

However, in the structure reinforcement structure and the method using the conventional steel and wire ropes, the load resistance of the structure is reinforced by restraining the concrete structure with the wire rope in the transverse direction, but the seismic resistance is not improved only by the restraint of the wire rope. Performance could not be expected.

The present invention is to solve the conventional problems as described above, the purpose is not only to reinforce the load capacity of the structure, but also can be expected to improve the lateral strength and axial strength due to the restraint of the concrete and the main steel reinforcement effect of the steel, It can solve the shortcomings of existing section expansion method or attachment type reinforcement method using carbon fiber and steel plate, and it is applicable to column, corner column, and outer column connected to wall. It is to provide a reinforcement method.

According to an aspect of the present invention,

First, the steel is installed in close contact with the surface of the pillar, and the lower portion of the steel is fixed to the foundation, which is a peripheral structure formed integrally with the pillar or pillar.

This is because the steel may be integrated with the pillar by the lower fixing of the steel to serve as a main reinforcing bar.

In addition, the steel is horizontally bound by the wire rope. The wire rope used for the transverse confinement serves as a strip reinforcing bar for the main reinforcing bar, and the wire rope is fixed to the steel to enable the simple installation of the strip reinforcing bar.

Second, since the steel and the pillars are heterogeneous materials, formwork is installed around the steel and the finishing concrete is filled in the formwork to synthesize the steel and the pillar.

At this time, the finishing concrete is to be filled tightly around the steel by using high-flow concrete and to form a hole in the slab of the upper column to be filled in the space between the steel and the formwork.

As a result, the steel, the wire rope is combined with the pillar and the steel serves as the main reinforcing bar, the wire rope serves as the strip reinforcing bar.

And preferably the steel is made of a plate-like steel "T" or I-shaped cross-sectional structure, so that the position of each other can be connected through the binding including a plurality of steel bars, the end of the wire rope It is bound to the steel through the screw member and the nut so that both ends thereof are bound.

In addition, the steel is preferably made of a plate-like steel "T" or I-shaped cross-sectional structure, is connected through the binding including a plurality of steel bars so that the position of each other is constrained, wire rope is both ends of the eye bolt And an end constraining member including an eye bolt connector to bind to each other so that both ends thereof are bound.

In addition, the steel material forms a hole in which one end of the steel is inserted into the base, and the hole is filled with mortar so that one end of the steel is fixed to the surrounding structure.

The steel is fixed to the anchor bolt on the base, the anchor bolt is fixed to one end of the steel or coupled

The connecting rod is further installed on the anchor bolt, and one end of the steel is fixed to the connecting rod to be fixed.

According to the present invention, the steel is wrapped in a wire rope, and is installed by fixing the lower end of the steel to the foundation, and thus can be applied as a load-bearing enhancement method of a pillar which is an existing reinforced concrete structure.

In addition, the present invention is also possible to reinforce the structure excellent in the applicability of the belt reinforcement construction by the wire rope in the case of a column, a corner column and an outer column connected to the wall.

In addition, since steel and wire ropes are constructed by high flow concrete, construction can be reinforced by constraining the column in the transverse direction by the high flow concrete, and the steel can act as a main reinforcing bar to enhance the transverse strength and axial strength. do.

Figure 1a and 1b is a perspective view showing a column structure reinforcement device according to the prior art,
Figure 1c is a perspective view showing a pillar structure reinforcement device of another structure according to the prior art,
2a and 2b is an end perspective view and an exploded assembly view of the end-fixed steel and wire rope according to the present invention,
3a, 3b and 3c is a perspective view of embodiments of the fixing method of steel to the present invention,
Figure 4 is a column reinforcement flow chart using the end-fixed steel and wire rope according to the present invention,
5A, 5B, 5C and 5D are graphs showing comparative test results of the prior art and the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

As shown in FIGS. 2A and 2B, the pillar strength reinforcing method using the end-fixed steel and the wire rope according to the present invention includes a pillar 5b and a foundation 5a integrally formed on the pillar 5b. Reinforcement using and wire rope.

Pillar strength reinforcement method using the end-fixed steel and the wire rope according to the present invention is provided with a plurality of extending in the longitudinal direction on the surface of the pillar (5b) so that the contact area with the pillar (5b) is increased and the constraint force is efficiently provided, The steel material 10 provided in contact with the pillar 5b is provided.

As shown in FIG. 2A, the steel material 10 has a plate-like member 12a and 12b such as a steel plate having a cross-sectional structure of “T” type or “I” type, which are steel bars 15 laterally. Are connected through), such steel bars 15 are arranged while maintaining a predetermined interval up and down the steel 10 and serve as a cast iron.

And such steel 10 is wrapped through the wire rope 30 on the outside of the column (5b), such a wire rope 30 has a length to wrap around the column (5b) of both ends of a certain length The screw members 16 are connected.

The screw member 16 is penetrated in the transverse direction through the plate-shaped members 12a, 12b of the cross-sectional structure of "T" type or I type, respectively, the two ends are bound, plate members (12a, 12b) After being fitted in the nut member 17 is coupled to each of the screw member 16 is tightened to give a tension force to the wire rope 30, respectively.

In addition, such a wire rope 30 is arranged while maintaining a predetermined interval in the vertical direction of the steel 10 in the form of wrapping the steel 10, and is coupled through the screw member 16 and the nut 17 as a whole The steel 10 is in close contact with the outer surface of the column (5b) (restrained by compression) and serves as a band reinforcing bar.

On the other hand, such a wire rope 30 is a portion through which the screw member 16 penetrates the plate member 12a, 12b of the "T" type or I-shaped cross-sectional structure in the transverse direction, as shown in Figure 2b In addition, it can install in the structure arrange | positioned before and behind the pillar 5b every other time.

Through such an arrangement structure, the wire rope 30 may fix the plate members 12a and 12b with a uniform force around the column 5b.

In addition, the steel 10 has a height h1 of the plate-shaped members 12a in the center portion as shown in Figure 2a is formed higher than the height (h2) of the plate members 12b on both sides, as will be described later, wire rope When the circumference is tightened by 30, it is configured to be crimpable to the pillar 5b side.

For example, when four plate members 12a and 12b are disposed laterally, two center portions have a height higher than two sides so that the wire rope 30 can be crimped.

On the other hand, the steel 10 is such that the installed extension length is the entire height of the column (5b).

When formed in the full height of the pillar 5b as mentioned above, it is formed over the upper and lower ends of the pillar 5b. Through such a structure, the pillar 5b is more effectively reinforced.

In addition, the present invention may be provided with a wire rope (30 ') of another structure that is fixed to the surface of the steel 10 by direct contact with the friction force, and wrap and fix the steel 10 by the tension force.

As shown in FIG. 2B, the wire rope 30 ′ having the structure as described above is fixed to each other by the end binding material 40 including the eye bolt 42 and the eye bolt connector 45, thereby extending the column 5b. ) Is a structure that restrains.

The end binding member 40 is fixed by connecting the both ends of the wire rope 30 to the eye bolt 42 and the eye bolt connector 45 which will be described later so that the wire rope 30 can tighten the plate members 12a and 12b. .

The end binding member 40 has an eye bolt 42 connected to one end of the wire rope 30 ', and an eye bolt connected to the other end of the wire rope 30' and fitted with the eye bolt 42. It is configured to include a bolt connector 45.

One end of the wire rope 30 ′ is connected to the eye bolt 42, and an eye bolt connector 45 is connected to the bolt part corresponding thereto. The eye bolt connector 45 is formed with a through hole 45a into which the bolt portion can be inserted, and is constrained so as not to escape from the eye bolt 42 by a nut 47 fastened to the bolt portion.

FIG. 2B illustrates a state in which the both ends of the wire rope 30 'are restrained by the eye bolt 42 and the eye bolt connector 45 and installed on the steel 10 in a horizontal state. Is a case of winding the plate member 12a, 12b.

Accordingly, the steel member 10 is first installed on the column 5b, and then the screw member 16 is “T” type or I type using the wire rope 30 having the screw member 16 at regular intervals. The plate-shaped members 12a and 12b of the cross-sectional structure are penetrated in the lateral direction and are tightened and fixed through the nut 17.

The wire rope 30 'having the eye bolt 42 and the eye bolt connector 45 is wound between the fixed wire rope 30 and connected to the other end of the wire rope 30'. It is possible by inserting the through-hole 45a of the eye bolt connector 45 into the bolt portion of the eye bolt 42.

In addition, by gradually tightening the nut 47 fastened to the bolt part in this state, the tightening force of the wire rope 30 ′ is transmitted to the column 5b through the steel 10.

Therefore, when the nut 47 is gradually tightened, the tension force is gradually generated in the wire rope 30 ', and the tension force by the plurality of wire ropes 30' is transmitted through the steel 10 to the pillar 5b. Delivered effectively.

These wire ropes 30, 30 'can be installed in a plurality at predetermined intervals in the longitudinal direction of the column (5b), the spacing and the wire rope 30, 30 according to the diameter, length of the column (5b). You can set the quantity of ').

In addition, the present invention is to fix the lower end of the steel (10) to the column (5b).

That is, one end of the steel 10 is fixed to the foundation 5a so that the steel 10 is fixed to the foundation 5a integrally formed with the pillar 5b and installed on the pillar 5b.

For example, as shown in FIG. 3A, a hole 72 into which the steel 10 is inserted is formed in the base 5a, and the lower portion of the steel 10 is embedded in the hole 72 to a predetermined depth. It can be seen that 75 is charged and fixed.

Alternatively, as shown in FIG. 3B, the anchor bolt 80 may be fixed to the foundation 5a, and the lower end of the steel 10 may be welded to the anchor bolt 80.

In this case, the anchor bolt 80 is fixed to the base (5a), the lower end of the steel material 10 to the upper end of the anchor bolt 80 is welded and combined.

Alternatively, as shown in FIG. 3c, the anchor bolt 80 is fixed to the base 5a, and the lower portion of the steel 10 is connected to the anchor bolt 80 by welding by using a connecting rod 82. It may be made of.

In this case, the anchor bolt 80 is located off the lower end of the steel 10, but is structurally connectable to each other through the connecting table (82).

As described above, according to the present invention, since the steel material 10 is wrapped with the wire rope 30 on the outer surface of the pillar 5b, and the lower end of the steel material 10 is integrally fixed to the foundation 5a, the steel material 10 10) will be able to serve as the main reinforcing bar of the column (5b),

Light and easy to process the steel wire 10 to the wire rope 30 can be a wire rope to play the role of the steel strip.

Accordingly, the pillar 5b is pressed and restrained by the steel 10 and the wire rope 30, and one end (such as the bottom) of the steel 10 is formed on the base 5a integrally formed with the pillar 5b. It is fixed so that the steel is exposed to the reinforcing steel bars in the column (5b), and furthermore, the steel (10) resists the working load (earthquake load, etc.) in the transverse direction perpendicular to the axial direction of the column (5b). By making it possible, more effective structural reinforcement of the pillar 5b is possible.

Hereinafter, a method of reinforcing column bearing strength using an end-fixed steel and a wire rope according to the present invention will be described in more detail.

Structure seismic reinforcement method using a steel plate and a wire rope according to the present invention first as shown in Figure 4 in the longitudinal direction of the column (5b) in the surface of the column (5b) including the column structure or grooves (not shown) in the surface A plurality of steel materials 10 including plate members 12a and 12b are extended.

Next, the lower end of the steel 10 is fixedly connected to the base 5a of the column 5b. In FIG. 4, the anchor bolt 80 is fixed to the foundation 5a as shown in FIG. 3c, and the lower end of the steel 10 is connected to the anchor bolt 80 by welding by using a connecting rod 82.

Next, the wire rope 30 is installed to surround the surface of the steel 10, which may use the screw member 16 and the nut 17 as shown in FIG. 2A,

After fixing the lower end of the steel (10) integrally to the base (5a), the wire rope 30 is installed to surround the surface of the steel 10, the end of the wire rope 30 as shown in Figure 2b It can also be fixed by connecting and restraining through the restraint 40.

Thus, in the present invention, since the lower end of the steel 10 is integrally fixed to the foundation 5a, it is possible to structurally reinforce the transverse load. It can play a role.

The steel 10 mainly has a function of resisting the compressive force in the vertical direction, but the steel 10 is also pressed into the outer circumferential surface of the column portion 5b through the wire rope 30 is also the role of the main reinforcement The wire rope may act as a band reinforcing bar.

Next, formwork 91 is installed around the steel 10 and the wire rope 30 and the high flow concrete 92 is filled in the formwork.

Accordingly, a vertical hole 93 is formed in the slab or beam 5c on the pillar 5b and the high flow concrete 92 is filled into the formwork through the vertical hole 93.

The reason for using the high flow concrete 92 in the present invention is to ensure that the concrete is tightly filled into the formwork by the steel and the wire rope, and the aggregate is preferably 13 mm.

The reason for filling the high flow concrete 92 by forming the vertical hole 93 in the slab or the beam as described above is that when the hole is formed in the formwork, the high flow concrete is hard to be filled tightly in the upper part of the column and the slab or the bottom of the beam. Because.

Accordingly, the filled high flow concrete 92 is combined with the steel 10 and the wire loafers 30 while being hardened to more reliably reinforce the column.

When the final high flow concrete is hardened, the formwork is demolded to complete the column reinforcement.

Hereinafter, in order to grasp the effect of the present invention more specifically, a series of tests were conducted, and the results are shown as a graph.

First, when the structure reinforcement structure 1 using the steel and the wire rope according to the present invention is not applied, only the steel 10 and the wire rope 30 and 30 'are applied to the outer surface of the column 5b and the bottom The load-strain test was performed for each case in which the structure reinforcement structure 1 using the steel and the wire rope according to the present invention was not fixed, and the results are shown as a graph.

First, as shown in Figure 5a, in the case of the non-reinforcement without using the steel and wire rope according to the present invention, not only the maximum strength is small but also shows brittle fracture in which the load drops sharply after the maximum strength, resulting in the most displacement resistance. Appeared small.

If only the steel 10 and the wire rope 30 are applied to the outer surface of the next pillar 5b and the bottom is not fixed, as shown in the graph 100b shown in FIG. Although similar strength was shown, the ductility behavior was relatively low due to the less drop of load after the maximum strength. As a result, the column displacement increased more than five times compared to the unreinforced column. This shows that it is only effective in increasing the ductility of the column when the steel installed on the outer surface is not settled and laterally reinforced with wire rope.

However, as shown in Figure 5c, when using the steel and the wire rope according to the present invention and fixing the bottom of the steel, the maximum strength is increased by about 1.2 times compared to the non-reinforced column and the load decreases after the maximum strength is very low It showed ductile behavior. Steel fixation and wire rope reinforcement are relatively effective in improving the strength and ductility of columns.

On the other hand, as shown in Figure 5d, when using the steel and the wire rope according to the present invention and fixed the bottom of the steel and using high-flow concrete, the strength of the column increases about 4 times compared to the non-reinforced column and after the maximum strength It can be seen that the drop in load is less than that of the unreinforced column, and the load cycle is significantly increased, which is very ductile. This shows that the method proposed in the present invention is very effective in increasing the strength and ductility of the pillar.

As can be seen from such a test, the reinforcing effect of the column using the steel and the wire rope according to the present invention can be seen that the effect of the fixed bottom of the steel and high flow concrete is very large.

Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited to this specific structure. Those skilled in the art will be able to variously modify or change the embodiments of the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

For example, in the above, the pillar portion 5b is formed of a quadrangular cross section, but the present invention may be modified in cross section and shape so as to be installed in a polygonal pillar structure and a circular pillar structure.

In addition, the steel 10 may cover the entire outer circumferential surface of the column 5b, but may have a structure that is partially installed. Nevertheless, it will be apparent that modifications or design variations of such simple embodiments are all clearly within the scope of the present invention.

1: Structure reinforcement structure using steel and wire rope
5a: foundation
5b: pillar
10: steel
12a, 12b: plate-shaped member
15: steel bar
30,30 ': wire rope
40: end binding material

Claims (5)

In the surface of the pillar (5a) or the grooves dug into the surface of the pillars in the longitudinal direction of the column "T" or "I" type of a plurality of steel (10) consisting of a cross-sectional structure is installed to extend, but based on the lower end of the steel ( Fixing to 5b);
Wire ropes 30 and 30 'are installed to surround the surface of the steel 10, and both ends of the wire rope are tensioned to bind the steel wire 10 to the pillar 5b by the wire rope. step; And
And additionally forming a high flow concrete (92) around the column such that the steel (10) and the wire rope are buried. The method of claim 1,
The high flow concrete (92) is installed on the upper surface of the formwork so as to be spaced apart from the steel and the war rope,
A vertical hole 93 is formed in the slab or the beam on the column;
And a step of allowing the high flow concrete to be filled into the formwork through the vertical hole. The method of claim 1,
Fixing the lower end of the steel to the base, end-fixed steel, characterized in that the lower end of the steel is inserted into the hole formed in the base formed in the base, and the high-strength mortar in the hole is fixed to the base and Column strength reinforcement method using wire rope. The method of claim 1,
Fixing the lower end of the steel to the base, the anchor bolt is fixed to the base, the end bolts characterized in that the lower end of the steel is fixed to the base by coupling the lower end of the steel to the connecting rod installed in the anchor bolt or anchor bolt Column strength reinforcement method using steel and wire rope. 5. The method of claim 4,
Further comprising a connecting rod (82) to the anchor bolt, the end strength reinforcing method using the end-fixed steel and wire rope characterized in that the coupling to the lower end of the steel to the connecting rod.

Images