KR20030006681A - Apparatus and method for reinforcing a construction by enlarging its' size - Google Patents

Abstract

PURPOSE: An earthquake-proof reinforcing method of a structure through sectional extension is provided to improve structural efficiency such as load carrying capacity, tenacity, ductility, etc., and to apply for a structure whose lower space is limited such as a viaduct. CONSTITUTION: The earthquake-proof reinforcing method of a structure through sectional extension comprises the steps of: perforating anchor holes on the appointed part of a structure for reinforcement(A); fixing/installing steel materials for reinforcement(100,100a) and folding type reinforcing steel materials(200a) to the structure for reinforcement(A) using an anchor bolt; anchoring a steel wire(300) to the steel materials for reinforcement(100,100a) and the folding type reinforcing steel materials(200a), then inducing tensile force to the steel wire; and completing a structure by installing a form and placing concrete.

Description

Apparatus and method for reinforcing a construction by enlarging its' size}

The present invention relates to a cross-sectional enlargement reinforcement device of the structure and a cross-sectional enlargement reinforcement method of the structure using the same. More specifically, the structure through the cross-sectional enlargement that can enhance the seismic performance of the existing structure not designed to earthquake by reinforcing the cross section of the structure, such as the piers, as the steel wire and the tensile force introduced and the concrete bound by the steel and the steel wire The method relates to an apparatus for seismic reinforcement.

Horizontal forces such as earthquakes cause structural failures such as flexural failure, flexural shear failure, shear failure, and attachment failure of cast iron bars. In particular, since domestic seismic bridges have introduced seismic design concepts only since the 1990s, the already installed bridges are not adequately prepared for earthquakes, and in the case of shear failure in bridge structures, the bridges are subjected to repeated loading by cyclic loading. There are fears of serious catastrophic accidents, such as the generation of warp cracks and the superstructure of the bridge sliding down along the warp cracks, resulting in falling bridges.

As a countermeasure against earthquakes, various seismic reinforcement devices such as seismic bridge devices, fall prevention devices on top plates, and reinforcement devices for bridge molds have been developed. Currently, the section expansion method using reinforcing bars is proposed as a reinforcement method for pier spheres.

Section expansion method using reinforcing bars consists of installing anchor reinforcing bars by drilling anchor holes in existing concrete piers, fixing epoxy reinforcing bars by filling and filling epoxy in anchor holes, placing reinforcing reinforcement bars around piers and placing concrete. . In order to anchor anchor reinforcement to the existing structure, the corresponding anchor hole drilling is preceded, so that the increase in the number of anchor holes damages the existing structure, and the work of injecting epoxy into the anchor hole and reinforcing the reinforcing bars is considerably performed. It is cumbersome and requires a lot of work. In addition, the reinforcement structure made of reinforcing steel and concrete is increased in order to secure sufficient required structural performance, it is difficult to apply in the case of paper restrictions such as high-rise bridge in the downtown.

Accordingly, the present inventors have developed a cross-sectional enlargement reinforcement apparatus of a structure and a cross-sectional enlargement reinforcement method of a structure using the same to solve the problems with the conventional cross-sectional enlargement method by reinforcing bars.

An object of the present invention is to extend the cross-section of the structural structure, such as bridge piers, such as pier and steel reinforced with the introduction of steel and tensile force and to increase the seismic performance of the existing structure is not designed to earthquake It is to provide a method and an apparatus for seismic reinforcement of a structure.

Another object of the present invention is to improve the structural performance, such as load capacity, toughness and ductility, deformation performance by the combination of steel and stranded concrete than the reinforcement of the cross section of conventional structures constructed of reinforced concrete, and also do not increase the enlarged cross section It is possible to provide a seismic reinforcement method and apparatus for the structure through cross-sectional enlargement that can be effectively applied to a structure having a paper limitation such as overpass in a city because it can secure required structural performance.

Still another object of the present invention is to provide a method and an apparatus for strengthening seismic structure through cross-sectional enlargement, which can be applied as a reinforcement method to enlarge a cross section of a bridge to ensure seismic performance while preventing falling off.

Still another object of the present invention is to provide an earthquake-proof reinforcement method and apparatus for the structure through cross-sectional enlargement, which can be expected to reduce the amount of work on site and shorten the air since the installation of steel and stranded wire is easy.

1 and 2 are partial perspective views of specific examples of reinforcing steels.

3 and 4 are perspective views of specific examples of bent reinforcing steels.

Figure 5 is a perspective view of the T-shaped bridge piers enlarged in cross section by applying the seismic reinforcement method of the present invention.

6 is a front view (FIG. 5A) of a cross-sectional enlarged reinforced pier of FIG. 5, a sectional view of a pier head (FIG. 5B), and a sectional view of a pier pillar (FIG. 5C).

7 is a perspective view of a gravity type (wall) piers with cross-sectional reinforcement by applying the seismic reinforcement method of the present invention.

FIG. 8 is a front view (FIG. 8A) and a sectional view (FIG. 8B) of the cross-sectional enlarged reinforced pier in FIG. 7.

<Description of Major Codes in Drawings>

A: Reinforcement structure (existing structure) B: Reinforcement structure

a: gravity piers f: foundation

c: T-pier pi h: T-pier pi

100, 100a, 100b: reinforcing steel 110: support plate

120: spacer 140, 240: stud rebar

200a, 200b: bendable reinforcing steel 210: fixed end

220: curved guide plate 300: stranded wire

In order to achieve the above object, the present invention is an apparatus for improving structural performance by expanding and reinforcing a cross section of an existing structure such as a pier, to be fixedly installed on the outer circumferential surface of the reinforcement target structure (A), reinforcement target structure (A) It comprises a thin plate-like support plate 110 and a spacer plate 120 perpendicular to the support plate 110 to be in contact with the outer circumferential surface and the anchor plate 111 is formed in the support plate 110 and the spacer plate Reinforcing steel 100 is formed with a guide hole 121a (120); It provides a seismic reinforcement device of the structure through the cross-sectional enlargement configured to include; and inserted into the guide hole (121a) formed in the spacer plate 120 of the reinforcing steel and the tensile line is introduced to the tensile force.

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

Earthquake-resistant reinforcing device of the structure through the enlarged cross-section of the present invention is composed of a combination of reinforcing steel and the stranded wire introduced tensile force.

The reinforcing steel 100 is fixedly installed on the outer circumferential surface of the structure A to be reinforced, and includes a support plate 110 and a spacer plate 120. Since the support plate 110 is a thin plate-shaped member attached to the outer circumferential surface of the reinforcement target structure A, the support plate 110 is manufactured to match the cross-sectional shape of the reinforcement portion of the reinforcement target structure A, and a plurality of anchor holes 111a are formed on the surface thereof. Is formed. Spacer plate 120 is a member perpendicular to the support plate 110 acts as a vertical reinforcement, the guide hole 121a is formed so that the strand 300 is passed through it, the strand 300 is to be stably coupled with the reinforcing steel. To help. The gap plate 120 may be formed with a concrete through hole 130 so that the concrete is evenly filled without empty space when the concrete is poured. This reinforcing steel 120 can expect improved concrete restraining effect compared to the conventional reinforcing method to simply reinforce the reinforcement, such a sufficient restraining effect improves the strength of the concrete, the structure is brittle while resisting the horizontal force The effect of controlling destruction, ie ductility, can be exerted.

As the reinforcing steel material, the U-shaped steel shown in FIGS. 1 and 2 may be applied when the structure to be reinforced is a vertical plane. That is, by using the c-shaped steel as the support plate 110 of the reinforcing steel (100a) so that the spacer plate 120 is vertically disposed between the upper and lower flanges (Fig. 1) or supported, or the reinforcing steel (100b) itself By applying to the U-shaped steel to the web to configure the support plate 110 and the upper and lower flanges to configure the spacer plate 120 (Fig. 2). When the spacer plate 120 is vertically disposed between the upper and lower flanges using the c-shaped steel as the support plate 110 of the reinforcing steel 100a as shown in FIG. 1, both ends of the c-shaped steel for fixing of the strand 300. It is preferable to process so that a fixed end (120 ') formed with a strand wire fixing hole is formed, this reinforcing steel (100a) is appropriately installed horizontally for the reinforcement of the horizontal portion, such as the pier head (h).

On the other hand, when the C-shaped steel is replaced by the reinforcing steel 100b as shown in FIG. 2, the sheath connector (in the present invention, the U-shaped stud reinforcing bar 140 is installed) is installed on the upper and lower flanges (both spacer plates 120). It is preferable to improve the adhesive force with the concrete to be post-installed, such a reinforcing steel (100b) is installed vertically for reinforcement of the vertical portion, such as T-beam column (c) or gravity type (wall) bridge (a) It is suitable to do. In addition, the upper and lower flanges of the U-shaped steel may be formed through the concrete through-holes 130 so that the concrete is evenly filled without empty space when the concrete is poured. The application of the U-shaped steel as described above allows the assembly and fabrication at the factory using ready-made products, reducing the amount of work on the site (in the field, only the work of attaching reinforcing steel using anchors to the structure to be reinforced) is performed. In addition, stable and improved quality can be expected.

The strand 300 is inserted into and installed in the guide hole 121a of the reinforcing steel, and after fixing in the reinforcing steel 100, a tensile force is introduced to reinforce the local buckling strength of the reinforcing steel 100. In addition, the stranded wire 300 is introduced to the tensile force is reinforced with the reinforcing steel 100 to the reinforcement structure (A) by applying a compressive force to the reinforced structure (B) in which the concrete is poured resistance to the axial force that is enlarged in cross section By increasing the cross sectional area and bending moment to resist the bending moment, it is possible to exert excellent deformation ability and also restrain the concrete binding effect. At the beginning and the end of the strand 300, a fixing unit for fixing the strand is installed, in the embodiment of the present invention is applied to the wedge 121b as the fixing unit, but other devices may be used.

Only the reinforcing steel 100 and the strand 300 described above can satisfy the reinforcing device of the structure by expanding the cross-section of the present invention, but the reinforcing steel as the vertical structure is installed on the foundation and the reinforcement target structure If and the strand is installed on the outer circumferential surface of the vertical structure, the foundation reinforcement may be applied by the existing pile expansion or load sharing method by earth anchor. For example, if the ground support force is insufficient or the section of the foundation board itself is insufficient depending on the moment and shear force acting on the bridge by the seismic force in the bridge, foundation reinforcement is required, which is connected to the bottom of the reinforcing steel support plate installed in the column. To install the L-shaped connecting plate to be in contact with the foundation and the pillar at the same time and can be reinforced by constructing the ground anchors or piles to be fixed to the foundation and the ground through the connecting plate. At this time, the connecting plate is connected to the column reinforcement device (reinforcement steel + strand wire) and the foundation reinforcement device (stack or earth anchor) installed in the column serves to integrate the column and the foundation reinforcement.

In addition, an end-only bent type reinforcing steel member 200a and 200b shown in FIGS. 3 and 4 may be used at an end portion of the structure to be reinforced so as to be wrapped in contact with the end portion. That is, the bent-type reinforcing steel (200a, 200b) is made in accordance with the end shape is to be tightly connected to the reinforcing steel 100 is installed in the center of the reinforcement target structure (A), the entire reinforcement target structure (A) It is proposed to facilitate the installation and fixing of the strand wire 300 while installing the evenly reinforcing steel 100.

Bending reinforcement steel (200a, 200b) is to be made to match the shape of the bent end when the end of the structure to be reinforced forms the bent end in the U-shape like the T-shaped pier or the U-shaped like the gravity piers do. The bent reinforcement steel is anchor hole is formed on the surface is fixed to the structure to be reinforced by anchor bolts, both ends of the fixed end 210 formed with the strand wire fixing hole 211 is formed to extend the reinforcing steel and It is to be integrated with the strand.

3 is a perspective view of a specific example of a bent reinforcing steel (200a) bent in the U-shape, characterized in that the plurality of curved guide spacer plate 220 of different sizes are further attached to the outer surface. That is, when buckling of the bent reinforcement steel is installed at the bent end, in particular, when the compressive force is concentrated at both ends, such as the pier head (a), the installation of the stranded wire is considered, the strand 300 is different in size Installed along the outer circumferential surface of the bent reinforcing steel (200a) having a curved guide plate 220 is fixed to the fixed end 210 of both ends. At this time, the application of the curved guide gap plate 220 having a different size guides the strand 300 to be installed while forming a gentle curve serves to prevent the break of the strand 300.

Figure 4 is a perspective view of another embodiment of the bent reinforcing steel (200b) bent in a U-shape, sheath connector (in the present invention is applied U-shaped stud reinforcement 240) to improve the adhesion to concrete on its outer surface ) Is attached and installed. Such bend type reinforcing steel is suitable for the case where the installation of the stranded wire may be omitted, especially when the compressive force is not concentrated in any part, such as gravity piers.

5 to 8 will be described in detail the seismic reinforcement method of the structure through the enlarged cross-section of the present invention. Seismic reinforcement method of the structure is a method for improving the seismic performance by expanding the cross section of the structure, the step of drilling an anchor hole in the appropriate position of the structure to be reinforced (A); Fixing and installing the reinforcing steels (100, 100a, 100b) and the bent reinforcing steels (200a, 200b) to the reinforcement target structure (A) using anchor bolts; Fixing the strand wire 300 to the reinforcing steel and the bent reinforcing steel, and then introducing a tensile force to the steel wire; And installing the formwork and pouring concrete to complete the reinforcement structure.

5 and 6 adopt a T-beam bridge having a column of circular cross-section as a reinforcement target structure, and FIGS. 7 and 8 adopt a gravity type (pier) bridge piers as a reinforcement target structure to apply the seismic reinforcement method of the structure through cross-sectional enlargement. The implementation example is shown. The method of seismic reinforcement of bridge piers is the same as the general structure method described above, but the foundation of bridge piers and chipping of bridge piers are further included to integrate foundations and piers. That is, the method of reinforcing the piers is a method for improving the seismic performance by expanding and reinforcing the cross section of the piers sphere which is the reinforcement target structure, the first step of crushing a portion of the foundation of the piers in contact with the piers; A second step of chipping the piers; A third step of drilling an anchor hole at an appropriate position of the piers; A fourth step of fixing the reinforcing steel and the bent-type reinforcing steel by using anchor bolts around the piers and the piers, including the fractured portions of the piers; A fifth step of introducing a tensile force into the strand after fixing the strand in the reinforcing steel and the bent reinforcing steel; And a sixth step of installing formwork and pouring concrete to complete the reinforcement structure. In addition, in the fourth step, the L-shaped connecting plate connected to the reinforcing steel installed in the pier pillar is installed to be in contact with the pier foundation and the pier pillar at the same time, and the earth anchor or pile fixed to the L-shaped connecting plate is provided with It may further include the step of fixing in the ground can be reinforced. In addition, the sixth step includes the step of installing a temporary joint bead around the upper surface of the piers when the formwork is installed; Removing the temporary joint beads when dismantling the formwork after placing concrete; And injecting and filling epoxy resin or mortar in a portion from which the temporary joint bead is removed, so as to further include a gap so that a gap does not occur between the existing reinforcement structure and the newly constructed reinforcement structure. can do.

For the seismic reinforcement of the piers, first, the pier foundation part (f) is crushed, which is installed so that the reinforcing steel (100, 100b) is in contact with the piers foundation (f) and the piers (c) at the same time. This is to prevent shear fracture and flexural fracture of the part which is easy to be vulnerable to the horizontal force such as earthquake by integrating the pier pillar (c). To make the pier surface even, the pier surface is determined by considering the anchor hole 111a of the reinforcing steel (100, 100a, 100b) to be applied to the pier pillar (c) and the pier head (h). Drill an anchor hole in the hole.

Subsequently, the reinforcing steels (100, 100a, 100b)) and the bent reinforcing steels (200a, 200b) of the cross-sectional enlargement reinforcing device of the structure of the present invention are installed on the pier surface using anchor bolts (111b) around the piers.

5 and 6, when the seismic reinforcement work of the T-type bridge piers having a circular piers (c) is applied to the reinforcing steel 100 having a curved support plate that matches the cross section of the circular piers as a pillar reinforcing steel The pier head (h) is applied to the reinforcing steel (100a) made of the c-shaped steel shown in Figure 1 in the center portion and the bent reinforcement steel bent in the c-shape shown in Figure 3 at its end ( 200a) applies. At this time, the reinforcing steel 100a installed in the center portion of the pier head h using the c-shaped steel is installed in the pier head h in the horizontal direction to suppress the occurrence of bending cracks and shear cracks in the center portion.

7 and 8, during the seismic reinforcement work of the gravity type pier (a), a reinforcing steel 100b made of the c-shaped steel shown in FIG. 2 is fixed on the surface of the center of the gravity pier (a). A plurality of vertically fixed and installed at intervals, and installed on both ends of the gravity pier (a) is applied to the bent reinforcement steel (200b) bent in the U-shape shown in FIG.

Although not shown, the bridge foundation f is provided with an L-shaped connecting plate installed in connection with the supporting plates of the reinforcing steels 100 and 100b installed in the pillar columns c and a, and fixed to the L-shaped connecting plate. The foundation reinforcement work can be carried out so that the earth anchors or piles pass through the piers and settle in the ground.

When the installation of the steel around the pier is completed, the tension wire 300 is installed and fixed to the reinforcing steels (100, 100a, 100b) and the bent-type reinforcing steels (200a, 200b) to be introduced into the tensile force. When the bent reinforcement steel 200a bent at the end is applied, the strand 300 is installed to form a gentle curve along the curved guide gap plate 220, so that the breakage of the strand after the tensile force is introduced. You can prevent it. The strand 300 is installed throughout the pier pillar (c) and pier head (h) in which the reinforcing steel (100, 100a, 100b) and bent-type reinforcing steel (200a, 200b) is installed to tension the strand (300) It is desirable that the tension space be free of voids. In FIG. 6C, the fixing of the start and end of the strand 300 is staggered.

After installing the seismic reinforcement device of the structure through the enlargement of the cross section as described above in the pier which is the reinforcement target structure, form the formwork and cast concrete, the reinforcement structure (B) is expanded to the cross section enlargement in the existing pier. At this time, since the upper surface of the bridge is exposed to the outside, if a gap occurs in the joint area between the existing reinforcement target structure and the newly constructed reinforcement structure, foreign matters such as rain water may seep into the gap in the joint area, causing a baektae phenomenon. Care should be taken to ensure that the joints are tightly handled as this may result. To this end, in the present invention, when installing the formwork joint bead having a triangular cross-section to the outer circumference of the reinforcement structure around the top of the pier when installing the formwork and remove the formwork joint beads at the time of removing the formwork after pouring concrete, A method of injecting and filling epoxy resin or mortar at a joint bead removal position has been proposed.

As a result, the reinforcing structure (B) is the seismic resistance of the existing structure that is not seismic designed by concrete reinforced by the steel (100, 100a, 200a) and the steel strand (300) by expanding the cross section of the bridge by integrating steel, strands and concrete Improve performance In addition, structural performances such as load capacity, toughness, ductility, and deformation performance are improved by the combination of steel and stranded concrete, and the required space performance can be secured without increasing the enlarged cross-section. Effectively applicable to the structure.

The present invention is to expand and reinforce the cross section of the structure such as bridge piers with the steel wire and the tensile steel introduced by the tensile force and the steel and the steel wire, the load capacity, toughness and Structural performance such as ductility and deformation performance can be improved, and the required structural performance can be secured without increasing the enlarged cross section, so it can be effectively applied to structures with limited space, such as overpasses in urban areas. In addition, when the present invention is applied to bridges, seismic performance can be secured while preventing falling, and installation of steel and stranded wire is easy, so that reduction of field work and air shortening can be expected.

Claims (8)

As a device for improving structural performance by expanding and reinforcing the cross section of existing concrete structures such as piers, It is fixed to the outer circumferential surface of the structure to be reinforced, comprising a thin plate-like support plate faced to the outer circumferential surface of the structure to be reinforced and the spacer plate perpendicular to the support plate, the support plate is formed with an anchor hole, Reinforcing steel is formed with a guide hole; And, A strand wire inserted into and installed in a guide hole formed in the spacing plate of the reinforcing steel and introducing a tensile force; Earthquake-resistant reinforcing device of the structure through the enlarged cross-section comprising a. According to claim 1, wherein the reinforcing steel is a reinforcing steel that is treated to form a support plate using the U-shaped steel, but the upper and lower flanges constitute a spacer plate or to arrange the spacer plate vertically between the upper and lower flanges. Earthquake-proof reinforcement device of structure through section enlargement. According to claim 1 or 2, wherein the reinforcement structure is a vertical structure that is installed on the foundation and the foundation when the reinforcing steel and the strand is installed on the outer peripheral surface of the vertical structure, connected to the lower end of the reinforcing steel support plate base and pillar An earthquake-resistant reinforcing apparatus of the structure through cross-sectional enlargement, further comprising: an L-shaped connecting plate installed at the same time and fixed to the connecting plate and anchored to the foundation and the ground. According to claim 1 or 2, when the end of the reinforcement target structure forms a bent end, it is bent to wrap in contact with the outer circumferential surface of the bent end, and both ends are fixed end having a strand wire fixing hole to the outside, Seismic reinforcement device of the structure through the cross-sectional enlargement, characterized in that it further comprises a bent reinforcement steel is attached to the outer surface of the plurality of curve guide gap plate having a different size to guide the installation to form a gentle curve. According to claim 1 or 2, when the end of the reinforcement target structure forms a bent end, it is bent to wrap in contact with the outer circumferential surface of the bent end, and both ends are fixed end having a strand wire fixing hole to the outside, The seismic reinforcement apparatus of the structure through cross-sectional enlargement, characterized in that the outer surface further comprises a bent reinforcement steel is further attached to a plurality of shea connectors. As a method for improving seismic performance by expanding and reinforcing the cross section of the pier sphere, which is the structure to be reinforced, A first step of crushing a portion of the foundation of the pier in contact with the pier; A second step of chipping the piers; A third step of drilling an anchor hole at an appropriate position of the piers; A fourth step of fixing the reinforcing steel and the bent-type reinforcing steel by using anchor bolts around the piers and the piers, including the fractured portions of the piers; A fifth step of introducing a tensile force into the strand after fixing the strand in the reinforcing steel and the bent reinforcing steel; And, A sixth step of installing formwork and pouring concrete to complete the reinforcement structure; Seismic reinforcement method of the structure through the cross-sectional enlargement, comprising a. The method of claim 6, wherein in the fourth step, The L-shaped connecting plate which is connected to the reinforcing steel installed in the pier pillars is installed to be in contact with the pier foundation and the pier pillar at the same time, and the step of fixing the ground anchor or pile fixed to the L-shaped connecting plate on the foundation and ground Seismic reinforcement method of the structure through the cross-sectional enlargement, characterized in that it is included. The method of claim 6 or 7, wherein the sixth step, Installing temporary joint beads around the top of the piers during formwork installation; Removing the temporary joint beads when dismantling the formwork after placing concrete; And injecting and filling epoxy resin or mortar in a portion from which the temporary joint bead has been removed.