KR20060055289A - Precast prestressed reinforced concrete bottom plate, bridge having the same, and construction method for the bridge - Google Patents

Abstract

A precast prestressed reinforced concrete deck is disclosed. Reinforced concrete slab that is dividedly mounted on the bridge's mold in the axial direction and the axial direction perpendicular to the mold and is integrated with the mold, and at least one sheath pipe is inserted into the slab into which the PC strand is inserted from the outside in the direction perpendicular to the bridge. do.

PSC, precast, prestressed, bottom plate, bending moment, shear force

Description

Precast prestressed reinforced concrete bottom plate, bridge having the same, and construction method for the bridge}

1 is a perspective view showing a precast prestressed reinforced concrete bottom plate according to an embodiment of the present invention.

2 is a perspective view schematically showing a bridge constructed using the bottom plate of the present invention.

3 and 4 are cross-sectional views taken along the line III-III and IV-IV of FIG. 2, respectively.

5 is a perspective view showing a precast prestressed reinforced concrete bottom plate according to another embodiment of the present invention.

6 is a perspective view schematically showing a bridge constructed using a bottom plate according to another embodiment of the present invention.

The present invention relates to a precast prestressed reinforced concrete deck plate, a bridge having the same, and a construction method thereof.

Particularly, a split is mounted on the mold of the bridge in the direction of the axial direction and the direction of the axial direction, and both ends of the mold are integrated to be integrated with the mold, and at least one sheath pipe into which the PC strand is inserted from the outside in the direction of the axial direction of the inside of the body is embedded. It relates to cast prestressed reinforced concrete deck.

In the conventional bridge, in order to install the bottom plate on the mold of the bridge, the formwork is manufactured in the field, the reinforcement is added to the formwork, the concrete is poured, and after the long time curing, the bottom plate is introduced by introducing the prestress to the bottom plate. Was completed.

However, in the conventional bridge construction method as described above, it is difficult to control the quality because the floor plate is manufactured in the field, and there is a problem in that the construction period is prolonged because it takes a lot of time for formwork, curing of concrete. In addition, since the reinforcing bar was required at the site, a lot of construction manpower was needed. Especially, in the case of constructing a bridge in the downtown area, a lot of field work is required, so a large work space is required and a long construction period is required. Problems such as occurrence occurred.

The precast prestressed reinforced concrete deck bridge was developed to solve this problem. In the bridge, the floor plate made of reinforced concrete slab is manufactured in advance in the factory, not in the field, and the precast floor plate is moved to the bridge construction site and mounted on the mold of the bridge to introduce prestress to integrate the floor plate. The bridge was completed by pouring the shear joints and synthesizing the bottom plate and the mold.

In order to solve this problem, Korean Patent Laid-Open Publication No. 2001-45640 has a barrier wall mounting portion having a fixed wall fixed steel rod which is inserted into the interior of the barrier wall at both sides of the bottom plate in a transverse direction, and the bottom plate has a bottom. Exposed end of longitudinal tension member disposed inside the plate is composed of a groove which is dug inwardly to be tensioned by the hydraulic jack, and the hydraulic jack installation portion is filled by the filling material after the longitudinal tension member is tensioned and fixed by the hydraulic jack is formed The side of the bottom plate is disclosed a precast reinforced concrete bottom plate having a groove filled with a resin to prevent the end of the tensioned transverse tension member from contacting the outside air.

However, according to this technique, various disadvantages exist.

First, when the bridge width is very large, for example, in the case of bridges of 10m or more, there is a concern that the bottom plate may exceed the capacity of the transport equipment, so transportation is impossible due to domestic traffic conditions, and also difficult to handle on site. .

In addition, the transverse tension members are arranged in a straight line and do not effectively correspond to the bending moment and the shear force.

Moreover, when the mold and the bottom plate are combined, the workability is bad and economically disadvantageous because the shear stud and the stud fixing groove should be installed and the non-shrink mortar should be used. At the same time, there is a high possibility of sliding between the mold and the bottom plate.

In addition, because the axial prestress must be introduced in order to obtain the integrity between adjacent bottom plates, the work is cumbersome and economical.

Accordingly, it is an object of the present invention to provide a precast prestressed reinforced concrete deck plate that can be easily transported or handled and can be easily applied to bridges with large bridges.

Another object of the present invention is to provide a precast prestressed reinforced concrete deck plate capable of effectively coping with tensile and compressive stresses.

Another object of the present invention is to provide a bridge having the above-described bottom plate and a construction method thereof.

Other objects and features of the present invention will be clearly understood through the preferred embodiments described below.

According to one aspect of the present invention, a reinforced concrete slab, which is dividedly mounted in the axial direction and the axial direction perpendicular to the mold of the bridge, and is integrated with the mold by having both ends across the mold. Disclosed is a precast prestressed reinforced concrete bottom plate in which at least one sheath pipe is embedded.

Preferably, the sheathpipe may extend along a position that counteracts the tensile and compressive stresses applied to the slab.

According to another aspect of the present invention, a plurality of molds extending in the axial direction over the piers are arranged side by side in the perpendicular direction of the axial axis, a plurality of bottom plates are disposed so that both ends across the adjacent molds in the axial perpendicular direction, the bottom plate Is a reinforced concrete slab integrated with a mold, in which at least one sheath pipe into which the PC strand is inserted from the outside in the axially orthogonal direction of the slab is buried in the form of resisting the static moment and the parent moment. In the space, the bottom plates are joined together using reinforcing bars, and the buried sheath pipes are connected so as to communicate with each other through the perpendicular direction of the throttle. Concrete is placed in this space, and the PC strands are inserted into the sheath pipe to tension and settle. A precast deck is installed on the bottom plates of the edges at right angles. The bridges are provided.

Preferably, the bottom plates of both edges may be constructed in concrete on site.

According to another aspect of the invention, the plurality of molds extending in the axial direction on the pier arranged side by side in the axial direction perpendicular to the arrangement of the plurality of bottom plates so that both ends across the adjacent mold in the axial direction ; Here, the bottom plate is a reinforced concrete slab integrated with the mold, at least one sheath pipe is inserted in the form of resisting the static moment and the parent moment in which at least one sheath pipe is inserted into the slab in the axially perpendicular direction from the outside. Coupling the bottom plates to each other using reinforcing bars in the space between the plates, and joining the buried sheath pipes so as to communicate with each other in the axial orthogonal direction; Pouring concrete into the space; And inserting the PC strand into the sheath pipe to tension-fix and disclosed a method of constructing a bridge having a precast deck.

Preferably, the bottom plate of the two edges in the perpendicular direction of the axial direction is formed by pouring together at the time of concrete pouring, it may further comprise the step of installing a protective wall on both edge bottom plates.

According to another aspect of the present invention, a reinforced concrete slab which is dividedly mounted in the axial direction and the axial direction perpendicular to the mold of the bridge, and both ends are integrated with the mold, and the PC strand is inserted from the outside in the axial direction perpendicular to the inside of the slab. At least one sheath pipe is embedded, and a precast prestressed reinforced concrete bottom plate is formed in which at least one through hole into which the tension member is inserted in the slab is formed in the slab.

Preferably, insertion grooves into which the elastic packing member is fitted may be formed along edges except for an upper surface, and receiving grooves may be formed to form a shear key by inserting a filler in contact with both sides.

According to another aspect of the present invention, a plurality of molds extending in the axial direction over the piers are arranged side by side in the perpendicular direction of the axial axis, and a plurality of bottom plates so that both ends are in contact with each other in the axial direction across the mold adjacent to each other in the axial direction. And slab, the bottom plate is a reinforced concrete slab integrated with the mold, and at least one sheath pipe is buried in the axially perpendicular direction in the slab to resist the static moment and the parent moment, and at least one axially in the slab. Through-holes are formed, and the buried sheath pipes are connected so as to communicate with each other through the axially perpendicular directions, and in the axially orthogonal spaces between the disposed bottom plates, the bottom plates are bonded to each other using reinforcing bars, and concrete is poured. Tension and fixation by inserting PC strand into sheath pipe, and inserting tension material into through hole A bridge is provided with a precast bottom plate that is settled after being tense.

Arranging a plurality of bottom plates so that both ends of the plurality of molds extending in the axial direction are arranged side by side in the perpendicular direction of the axial direction on both sides of the adjacent molds in the axial direction; Here, the bottom plate is a reinforced concrete slab integrated with the mold, at least one sheath pipe buried in the axially perpendicular direction in the slab to resist the static moment and the parent moment, at least one penetrating in the axial direction in the slab A ball is formed, and the bottom plates are coupled to each other by using reinforcing bars in the space between the orthogonal directions of the disposed bottom plates, and the buried sheath pipes are coupled to communicate with each other in the perpendicular direction of the axial directions; Pouring concrete into the space; Inserting the tension member into the through hole, tensioning and then fixing; And inserting the PC strand into the sheath pipe to tension-fix and disclosed a method of constructing a bridge having a precast deck.

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

1 is a perspective view showing a precast prestressed reinforced concrete bottom plate according to an embodiment of the present invention.

The bottom plate 200 is made of a reinforced concrete slab 201 embedded so that the reinforcing bars 202 are exposed from the side, and is divided and mounted in the axial direction and the axial direction perpendicular to the mold of the bridge to integrate with the mold.

At least one sheath pipe 204 is embedded in the reinforced concrete slab 201 in the orthogonal direction so that the PC strand can be inserted from the outside.

Preferably, the sheath pipe 204 may extend along a position that counteracts the tensile and compressive stresses applied to the reinforced concrete slab 201. Of course, it may be extended in a horizontal direction in the reinforced concrete slab 201.

FIG. 2 is a perspective view schematically illustrating a bridge constructed by using the bottom plate of the present invention, and FIGS. 3 and 4 are cross-sectional views taken along line III-III and IV-IV of FIG. 2, respectively.

On the pier 1, a plurality of molds 100 extending in the axial direction are fixedly arranged in parallel in the axial direction of the axial direction, and interconnecting adjacent molds 100 in the axial direction of the axial direction (indicated by arrow A in FIG. 2). Horizontal beam 150 is installed at regular intervals in the axial direction.

The bottom plate 200 is divided into the axial direction and the axial direction perpendicular to the mold 100, and both ends of the bottom plate 200 in the axial direction perpendicular to the adjacent mold 100, respectively.

The pouring base plate 250 is formed by pouring concrete outward from the bottom plate 200 on the mold 100 positioned at both edges, and the protective wall 300 is installed on the pouring base plate 250. The pouring bottom plate 250 is installed at the site construction, and the prefabricated prefabricated barrier wall may be used.

3 and 4, the reinforcing bars 202 which are disposed on the mold 100 and protrude from the side of the bottom plate 200 between adjacent bottom plates 200 are coupled in a mutually proper manner and throttled. A coupler 206 is connected between the sheath pipes 204 exposed to the outside in a perpendicular direction.

The space between adjacent bottom plates 200 pours concrete to integrate the entire bottom plates 200.

Hereinafter, a method of constructing a bridge having the above structure will be described.

After the plurality of molds 100 are fixedly installed on the pier 1, the precast prestressed reinforced concrete bottom plates 200 according to the present invention are disposed in the axial orthogonal direction and the axial direction.

As described above, the precast prestressed reinforced concrete bottom plates 200 are disposed so that both ends thereof are fixed to the mold 100 in the axially orthogonal direction.

After the bottom plates 200 are disposed, the adjacent bottom plates 200 are coupled using reinforcing bars 202 protruding to the side of the bottom plate 200. At this time, although not shown, reinforcing bars protruding upward from the mold 100 may be combined together. In addition, the sheath pipe 204 exposed between the bottom plates 200 adjacent to each other in the orthogonal direction is communicated using the coupler 206.

On the other hand, the formwork for placing the bottom plate 250 (cantilever part bottom plate) is installed, and the extension sheath pipe 207 connected to the sheath pipe 204 of the bottom plate 200 of both edges in the form of the landfill in advance do.

Thereafter, the concrete 240 is poured into the space between the bottom plates 200 and the formwork.

After the concrete is cured, a PC strand (not shown) is inserted into one of the extended sheath pipes 207 exposed to the outside so as to protrude into the opposite sheath pipe 207, and then the PC strands are tension-fixed and end fixed. The plate 210 is fixed to the outside of the two pour bottom plate 250. Preferably, a groove may be formed in the outer surface of both pour bottom plates 250 and the end fixing plate 210 may be located in the groove, and then filled with epoxy to protect it from corrosion.

On the other hand, the fixing of the PC strand may be made before placing the concrete.

Subsequently, the bridge 300 is completed by installing the protective wall 300 on the pour bottom plate 250 and paving it on the surface consisting of the bottom plate 200 and the poured concrete 240.

On the other hand, the bottom plate 250 is not formed by pour, when using a precast bottom plate, the process of installing the formwork for the pour bottom plate 250 can be omitted.

5 is a perspective view showing a precast prestressed reinforced concrete bottom plate according to another embodiment of the present invention.

The same reference numerals are given in the same parts as in FIG. 1, and only the differences will be described below.

Insertion grooves 212 are formed along side edges of the bottom plate 200 adjacent in the axial direction adjacent to the side and the bottom surface except the upper surface, and an elastic packing member such as rubber packing is fitted into the insertion grooves 212. .

In addition, the receiving grooves 210 are formed at regular intervals on the side, and the receiving grooves 210 have an injection hole 211 on the upper surface of the bottom plate 200.

In addition, an inlet of the through hole 220 penetrating the bottom plate 200 in the axial direction is formed between the receiving grooves 210, the tension material 222 such as steel wire is inserted into the through hole 220. .

6 is a perspective view schematically showing a bridge constructed using a bottom plate according to another embodiment of the present invention. Hereinafter, a method of constructing a bridge using a bottom plate according to another embodiment of the present invention will be described with reference to FIG. 6.

Referring to FIG. 6, after the rubber packing member is inserted into the insertion groove 212 formed at the side surfaces of the bottom plates 200, the bottom plates 200 are disposed. More specifically, the end of the bottom plate 200 in the orthogonal direction perpendicular to the molds 100 is disposed, and the end in the axial direction is disposed so that the opposite side faces almost each other. In this case, the portions adjacent to the bottom plates 200 may not coincide with the top surface of the horizontal beam 150.

According to such a structure, since the bottom plate 200 can be arrange | positioned without taking into consideration the space | interval of the cross beam 150, there exists an advantage that construction is easier. In addition, there is an advantage that the length of the bottom plate 200 in the axial direction is not greatly limited.

Even if disposed in such a narrow interval it can minimize the damage caused by the contact by the elastic packing member.

After placing the bottom plates 200 as described above, the tension members 222 such as PS steel wires are inserted through the axial through-holes 220 to tension and settle.

Subsequently, fillers such as non-contraction mortar are injected through the injection holes 211 formed on the upper surface of the bottom plate 200. That is, the injection holes 211 respectively formed on opposite sides of the adjacent bottom plate 200 are in contact with each other to form an injection hole forming a closed curve.

In addition, the receiving groove 210 which is connected to the injection hole 211 is in contact with the adjacent side to form a closed receiving space.

In this state, when a filler such as non-condensed mortar is injected through the injection hole 211, the filler is filled in the space formed by the injection hole 211 and the receiving groove 210 to form a shear key.

In this embodiment, the application of the filler material is exemplified, but only the tension material may be applied.

Therefore, unlike the above embodiment, by applying the axial direction tension member, it is possible to tension in the axial direction without a separate pour for the axial direction.

Although the above has been described with reference to the preferred embodiments of the present invention, various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited to the above embodiments, but should be determined by the claims described below.

As described above, the present invention has various advantages.

First, even when the bridge width is very large, there is an advantage that the size of the bottom plate to be installed can be appropriately set, so that it is easy to transport and easy to handle in the field.

In addition, since the sheath pipe buried in the crosswise direction extends along a position that offsets the tensile stress and the compressive stress applied to the bottom plate, it is possible to effectively cope with the tensile stress and the compressive stress. That is, it can effectively cope with the constant moment and the parent moment.

In addition, according to one embodiment, when combining the mold and the bottom plate, there is an advantage that the workability is excellent and economically good because it is simply combined by concrete pouring.

Furthermore, according to another embodiment, it is possible to fix the bottom plate without additional pouring work in the axial direction, and further reduce the amount of reinforcing bars embedded in the bottom plate in the axial direction.

In particular, since the bottom plate can be arranged irrespective of the cross beam, there is an advantage in that construction is simple.

Claims (10)

A reinforced concrete slab which is dividedly mounted on the mold of the bridge in the axial direction and the perpendicular to the axial direction, the both ends of which span the mold and are integrated with the mold, wherein at least one PC strand is inserted into the slab from the outside in the axially perpendicular direction; A precast prestressed reinforced concrete floor plate, characterized in that sheath pipes are embedded. The precast prestressed reinforced bottom plate according to claim 1, wherein the sheath pipe extends along a position that cancels the tensile stress and the compressive stress applied to the slab. A plurality of molds extending in the axial direction on the piers are arranged and fixed side by side in the perpendicular direction of the pier, A plurality of bottom plates are arranged so that both ends extend to the adjacent mold in the axial direction, The bottom plate is a reinforced concrete slab integrated with the mold, and at least one sheath pipe into which the PC strand is inserted from the outside in the axially orthogonal direction in the slab is buried in the form of resisting the static moment and the parent moment. The bottom plates are mutually coupled using reinforcing bars in the spaces between the arranged bottom plates, and the buried sheath pipes are coupled to communicate with each other over the axially perpendicular direction. Concrete is cast in the space, the PC strand is inserted into the sheath pipe, the tensile fixation, the bridge with a precast bottom plate, characterized in that the barrier wall is installed on the bottom plate of both edges in the direction perpendicular to the throttle. 4. The bridge with precast decks according to claim 3, wherein the bottom slats at both edges are constructed in concrete on site. A reinforced concrete slab which is dividedly mounted on the mold of the bridge in the axial direction and the perpendicular to the axial direction, the both ends of which span the mold and are integrated with the mold, wherein at least one PC strand is inserted into the slab from the outside in the axially perpendicular direction; A precast prestressed reinforced concrete bottom plate, wherein the sheath pipe is embedded, and at least one through-hole is formed in the slab into which the tension member is inserted in the axial direction. According to claim 5, Both sides of the axial direction insertion grooves into which the elastic packing member is fitted is formed along the edge except the upper surface, the receiving groove is formed so that the filler is inserted to form a shear key in the state that both sides are in contact with each other. Precast prestressed reinforced concrete bottom plate, characterized in that. A plurality of molds extending in the axial direction on the piers are arranged and fixed side by side in the perpendicular direction of the pier, A plurality of bottom plates are arranged so that both ends of the mold adjacent in the orthogonal direction and abut each other in the orthogonal direction, The bottom plate is a reinforced concrete slab that is integrated with the mold, wherein at least one sheath pipe is buried in the slab in a direction perpendicular to the axial direction and resists a constant moment and a parent moment in the slab, and the axial direction in the slab. At least one through hole is formed, After the buried sheath pipes are coupled to communicate with each other over the axial orthogonal direction, the bottom plates in the axial orthogonal space between the arranged bottom plates are bonded to each other using reinforcing bars, and concrete is poured. A bridge having a precast bottom plate, wherein the PC strand is inserted into the sheath pipe for tensile fixation, and a tension material is inserted into the through hole to tension the sheet. Arranging a plurality of bottom plates so that both ends of the plurality of molds extending in the axial direction are arranged side by side in the perpendicular direction of the axial direction on both sides of the molds adjacent to the axial direction; Here, the bottom plate is a reinforced concrete slab integrated with the mold, the at least one sheath pipe in the slab perpendicular to the direction of the axial perpendicular to the buried in the form of resisting the constant moment and the parent, Coupling the bottom plates to each other by using reinforcing bars in a space between the arranged bottom plates, and coupling the buried sheath pipes to communicate with each other over the axial right angle direction; Pouring concrete into the space; And And inserting the PC strand into the sheath pipe to tensilely fix the bridge. 9. The precast floor according to claim 8, wherein the bottom plates of both edges in the axially perpendicular direction are formed by pouring together at the time of the concrete pouring, and a protective wall is installed on the both edge bottom plates. Construction method of bridge with plate. Arranging a plurality of bottom plates so that both ends of the plurality of molds extending in the axial direction are arranged side by side in the perpendicular direction of the axial direction on both sides of the molds adjacent to the axial direction; Here, the bottom plate is a reinforced concrete slab that is integrated with the mold, at least one sheath pipe embedded in the slab in the form perpendicular to the axial axial direction to resist the moment and the parent moment, the throttle inside the slab At least one through hole is formed in the Coupling the bottom plates to each other by using reinforcing bars in a space between the axially perpendicular directions of the arranged bottom plates, and coupling the buried sheath pipe to communicate with the entire axially perpendicular direction; Pouring concrete into the space; Inserting a tension member into the through hole and tensioning the tension member; And And inserting the PC strand into the sheath pipe to tensilely fix the bridge.

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