KR20060056008A - Construction method for p.s.c. girder bridges and bridges production it - Google Patents

Abstract

The present invention relates to a method for constructing a PS girder bridge and a bridge manufactured by the method, and an object thereof is to form a notch portion at an upper end of a girder to accommodate a fixing device to which a secondary tension member is fixed, so that the secondary bridge or the continuous bridge can be easily secondary tensioned. In order to provide a method of constructing the PSC girder bridge, and to provide a bridge manufactured by the method This is made of a plurality of primary tension material can be inserted or inserted, the step of manufacturing a girder is formed in the notch portion is accommodated in the fixing fixture for fixing the secondary tension material on both ends, and mounting the girder on the pier; Installing a crossbeam for connecting the girders in the lateral direction, inserting and fixing a secondary tension member in the fixing unit, constructing a bottom plate on the girders except for the notches, and And tensioning the secondary tension member installed through the negative anchorage, and finishing the bottom plate including the notch by filling the bottom plate with concrete or the like.

In addition, a plurality of primary tension members are inserted or inserted, and are arranged in more than two spans, the girder for manufacturing a girder formed in the notch portion is accommodated in the upper part of the outermost end of the span fixed to the secondary tension member is fixed. Mounting the girder on a plurality of piers, installing a crossbeam for connecting the girders in the transverse direction to each girder, and continuously inserting a secondary tension member in the anchorage over the foreground; And connecting each of the girders, constructing a bottom plate on the girder except for the notch part, tensioning a secondary tension member installed through the fixing part of the notch part, and a bottom plate including the notch part. This includes finishing the concrete.

In addition, it is a PS C continuous girder bridge, characterized in that produced by the above construction method.

CS, girder bridge, notch

Description

Construction method of PS girder bridge and bridge made by this method {CONSTRUCTION METHOD FOR P.S.C. GIRDER BRIDGES AND BRIDGES PRODUCTION IT}

1 is a view for explaining the construction method of the PS simple girder bridge according to the present invention, a front view showing a PS girder according to the present invention.

2 is a cross-sectional view taken along the line AA of FIG.

Figure 3 is a perspective view of the main portion of the PS girder according to the present invention.

FIG. 4 is a view showing the PS girder of FIG. 1 mounted on a pier; FIG.

5 is a view for explaining a step of installing a cross beam in the girder in the state of FIG.

6 is a view for explaining the step of fixing by inserting the secondary tension material in the state of FIG.

7 is a view for explaining an example of the step of constructing the bottom plate except the notch in the state of FIG.

8 is a view for explaining another example of the step of constructing the bottom plate except the notch in the state of FIG.

9 is a cross-sectional view of FIG. 8.

10 is a view for explaining another example of the step of constructing the bottom plate except the notch in the state of FIG.

11 is a cross-sectional view of FIG. 10.

12 is a view for explaining the step of tensioning the secondary tension material through the fixing unit of the notch in the state of FIGS.

FIG. 13 is a view for explaining a step of finishing by embedding a bottom plate including notches in concrete in FIG. 8; FIG.

14 is a perspective view showing a state in which a mounting hole is installed in a cross beam formed at a point portion of a girder according to the present invention;

Figure 15 is a cross-sectional view showing a state in which a hole is formed in the cross beam formed in the center portion of the girder according to the present invention.

16 is a view for explaining the construction method of the CS continuous girder bridge according to the present invention.

(Explanation of symbols for the main parts of the drawing)

10: Girder 11: Primary Tension

12: secondary tension material 13: anchorage

14: notch 15: cross beam

20: bridge 30: bridge device

40: bottom plate

The present invention relates to a method for constructing a PS girder bridge and a bridge manufactured by the method, and more particularly, to form a notch portion in which an anchorage to which a secondary tension member is fixed is formed at an upper end of a girder to easily tension the severed bridge or a continuous bridge. The present invention relates to a PSC girder bridge construction method and a bridge fabricated by the method for installing post-maintenance anchorages in a cross beam and forming a hole through which steel wires pass to reinforce an aging bridge after a long time.

In general, there are several types of bridges, among which girder bridges are installed in the longitudinal direction between the bridge piers, a bottom plate (also called slab) is installed on the upper surface of the girder, and concrete is placed on the bottom plate. do.

In addition, bridges and bridges are called spans or spans. Bridges in which the molds of each span are separated are called simple bridges, and continuous bridges are called continuous bridges. Three spans and four spans depending on the number of continuous spans. It is called 5 span continuous bridge.

Various methods for constructing the girder bridge as described above are known, and as a conventional example thereof, it can be found in the "Construction method of a continuous bridge using an exposed fixing device and a prestressed concrete girder having the same" of Patent Publication No. 2001-0000430.

Looking at the above disclosure, "an exposed settling comprising at least one pair of simple steel wires installed per girder, at least one continuous steel wire passing through a plurality of girders and / or one or more connecting steel wires connecting girder and girder In the method of constructing a continuous bridge using a prestressed concrete girder with a device, after the girder is fabricated, the simple steel wire is tensioned, the girders are mounted on the piers, and the sheath connection and / or the continuous, connecting steel wire are arranged, Placing and slab simultaneously, and applying tension to the girder by tensioning the continuous and / or connecting wires; and the live load acting on the girder, and re-tensioning the continuous, connecting wires when excessive sagging and cracking occur due to aging of the girder during use. Compensating for sag and cracks, and increasing the load capacity of the girder; Continuous tenets construction method using prestressed concrete girder with exposed fixing device "may be made public.

The exposed fixing device mounts a plurality of first-tensioned girders on the piers, arranges the secondary tension continuous and connecting wires, and then casts the connecting concrete and the bottom plate at the same time, so that the secondary tension can be made after curing. As one configuration, it is possible to reduce the construction period by placing the joints and the bottom plate at the same time, and even in case of excessive deflection, crack occurrence and increase in the design load capacity by the large vehicles that are aged over the bridge or exceeding the design load. Even without the repair and reinforcement process, the unattached steel wire built into the girder can be repaired and reinforced at a very low cost by retensioning or additional tensioning using a hydraulic tensioner in the exposed fixing device.

However, the secondary tension continuous, the anchorage tensioning the connecting wire is exposed to the outside can be easily tensioned, but the secondary tension continuous, the connecting wire is for the repair of the aging bridge rather than the construction of the bridge As it is used a lot, the tension on both sides of the girder rather than tension at the end of the girder due to the already carried out the sea plate has a problem of poor workability and easy to manage.

The present invention has been made to solve such a conventional problem, its purpose is to form a notch portion in the upper part of the girder to accommodate the anchorage to which the secondary tension member is fixed to facilitate the secondary tension of the intermittent bridge or continuous bridge easily It is to provide the construction method of the girder bridge and the bridge manufactured by this method.

In addition, another object of the present invention is to provide a post-maintenance fixing fixture in the cross beam to form a hole through which the steel wire passes through to install the post-maintenance fixture to reinforce the old bridge after a long time, and to provide a bridge manufactured by the method Is in.

The present invention for achieving this object is made to be inserted or inserted into a plurality of primary tension material, the step of manufacturing a girder is formed in the notch portion is accommodated in the fixing fixture is fixed to the secondary tension material on both ends, and the girder Mounting on the pier, installing a crossbeam for connecting the girders in the lateral direction, inserting and fixing a secondary tension member in the anchorage, and a bottom plate on the girder except for the notch. The construction step, and the step of tensioning the secondary tension material installed through the fixing unit of the notch, and comprises the step of finishing by filling the bottom plate including the notch with concrete or the like.

In addition, in the step of constructing the bottom plate is to place and curing the bottom plate.

In addition, in the step of constructing the bottom plate is characterized in that the construction of the bottom plate by precast.

In addition, in the step of constructing the bottom plate in the state in which the precast bottom plate installed in the bottom plate is to cast and curing concrete on the top surface of the precast floor plate.

In addition, in the step of forming the cross beam in the girder is to form a hole for the post-maintenance fixing fixture installation and the steel wire passes through.

In addition, a plurality of primary tension members are inserted or inserted, and are arranged in more than two spans, the girder for manufacturing a girder formed in the notch portion is accommodated in the upper part of the outermost end of the span fixed to the secondary tension member is fixed. Mounting the girder on a plurality of piers, installing a crossbeam for connecting the girders in the transverse direction to each girder, and continuously inserting a secondary tension member in the anchorage over the foreground; And connecting each of the girders, constructing a bottom plate on the girder except for the notch part, tensioning a secondary tension member installed through the fixing part of the notch part, and a bottom plate including the notch part. This includes finishing the concrete.

In addition, it is a PS C continuous girder bridge, characterized in that produced by the above construction method.

The method may further include an auxiliary tension step for structurally continuizing the girder by partially tensioning the secondary tension member after each connecting the girder.

In addition, in the step of constructing the bottom plate is to place and curing the floor plate.

In addition, in the step of constructing the bottom plate is characterized in that the construction of the bottom plate by precast.

In addition, in the step of constructing the bottom plate in the state in which the precast bottom plate is installed in the bottom plate is characterized in that the site is cast and cured concrete on the upper surface of the precast bottom plate.

In addition, in the step of forming the crossbeam in the girder, it is characterized in that to form a hole for the post-maintenance fixing fixture installation and the steel wire passes through.

In addition, after the step of finishing the bottom plate including the notch with concrete or the like will further comprise an expansion joint installation step.

In addition, the steel wire rod is inserted into the hole through which the post-maintenance fixing fixture and the steel wire pass through the old bridge for a long time to be tensioned.

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

1 is a view for explaining the construction method of the PS simple girder bridge according to the present invention, a front view showing a PS girder according to the present invention, Figure 2 is a cross-sectional view taken along the line A-A of Figure 1, Figure 3 It is a perspective view of the main part of PS girder which concerns on this invention. Hereinafter, reference numeral 10 denotes a girder, 20 denotes a pier, 30 denotes a bridge arrangement, and 40 denotes a bottom plate.

In order to construct the PS simple girder bridge as shown, the girder 10 is manufactured in advance in the factory, the girder 10 is made so that a plurality of primary tension material 11 is inserted or inserted, both ends The notches 14 to accommodate the fixing unit 13 to which the secondary tension member 12 is fixed are formed on the upper side.

In addition, the primary tension member is preferably tensioned at the time of manufacture of the girder 10 to improve the compressive force of the girder 10.

FIG. 4 is a view showing the PS girder of FIG. 1 mounted on a pier. FIG. 4 illustrates a state in which a pair of girders 10 are mounted on a pier 20, and a plurality of girders 10 are disposed depending on the width of the bridge. ) Can be mounted.

FIG. 5 is a view for explaining a step of installing a cross beam in a girder in the state of FIG. 4, wherein the cross beam 15 is placed in the field by reinforcing bars or the like between the pair of girders 10 in the field. .

In addition, the cross beam 15 is to be formed in the point portion formed in the center and both ends of the girder 10.

In addition, FIG. 14 shows a state where the mounting hole 15a is installed in the cross beam 15 formed at the point portion of the girder 10 according to the present invention. The hole 15b is formed in the cross beam, and when the old bridge is used for a long time to repair the bridge, a wire rod is inserted into the mounting hole 15a and the hole 15b so as to be tensioned.

FIG. 6 is a view for explaining the step of inserting and fixing the secondary tension member in the state of FIG. 5, and inserting and fixing the secondary tension member 12 in the fixing unit 13 installed in the notch 14.

In addition, the step of installing the cross beam 15 to the girder 10 and the step of fixing by inserting the secondary tension member 12 may be carried out in any order, in the present invention, for convenience of description girders 10 The step of installing the cross beam 15 is to be performed first.

7 to 11 are views showing various embodiments of the step of constructing the bottom plate except the notch in the state of FIG.

That is, FIG. 7 is to place and cure the bottom plate 40a in the step of constructing the bottom plate 40, and FIGS. 8 and 9 show the bottom plate in the step of constructing the bottom plate 40. 40b is a precast construction, and FIG. 8 shows concrete on the upper surface of the precast deck in a state in which the precast deck is installed at the bottom plate 40c in the construction of the deck 40. It is to place and cure.

FIG. 12 is a view for explaining the step of tensioning the secondary tension member through the fixing unit 13 of the notch part 14 in FIGS. 7 to 11, and the notch part 14 in the step of constructing the bottom plate 40. By constructing the bottom plate 40, the notch 14 is in an open state, and the secondary tension member 12 fixed to the fixing unit 13 accommodated in the notch 14 is girder 10) on both sides (see arrows in the drawing).

FIG. 13 is a view for explaining a step of finishing by filling a bottom plate including notches in concrete in FIG. 7 with concrete, etc., both sides of the secondary tension member 12 through the fixing unit 13 fixed to the notches 14. After the tension in the bottom plate 40 including the notch 14 is to be buried in concrete or the like to finish the bottom plate 40.

In the above, the construction method of the CS simple girder bridge has been examined, and the construction method of the CS continuous girder bridge will be described below.

16 is a view for explaining the construction method of the CS continuous girder bridge according to the present invention.

As shown, the CS continuous girder bridge is formed so that a plurality of primary tension members 11 can be inserted or inserted therein, and are arranged in two or more spans, and the secondary tension members 12 are fixed above the outermost end of the span. Producing a girder 10 in which the notch 14 to accommodate the anchorage 13 is formed (S10), and mounting the girder 10 on a plurality of piers (20) (S20), and Installing a cross beam 15 to each girder 10 for connecting the girder 10 in the lateral direction (S30), and the secondary tension member 12 is continuously inserted into the fixing unit 13 over the foreground. Arranging step (S40), and connecting between the girder 10 (S50), respectively, and the step of constructing the bottom plate 40 on the girder 10 except the notch 14 (S60) And tensioning the secondary tension member 12 installed through the fixing unit 13 of the notch 14 (S70) and the notch 14. One bottom plate 40 is to include a step (S80) to finish with concrete or the like.

In addition, it is natural that the CS continuous bridge girder bridge produced by the above-mentioned construction method belongs to the right of the present invention.

In addition, it is preferable to further include an auxiliary tension step for structurally continuing the girder 10 by partially tensioning the secondary tension member 12 after each step of connecting the girder 10, respectively.

That is, after connecting each between the girders 10 in order to continue the girder 10 installed between the two spans, the secondary tension member 12 is partially tensioned to improve the compressive force.

In addition, the step of constructing the bottom plate 40 on the girder 10 except for the notch 14 may be cast and cured the bottom plate 40 in the same way as a simple girder bridge, the bottom plate 40 ) Can be constructed by precast, and in the state in which the precast bottom plate 40 is installed, the floor plate 40 can be placed and cured concrete on the upper surface of the precast bottom plate.

In addition, the post-maintenance fixing unit 15a is installed in the cross beam 15 of the girder 10 so that the post-maintenance fixing unit 15a and the hole 15b through which the steel wire passes can be formed. ) The installation and the wire rod is inserted into the hole (15b) through which the wire rod is to be repaired to repair the old bridge.

In addition, the CS continuous girder bridge of the present invention is the expansion joint installation step after the step of finishing the bottom plate 40 including the notch 14 in the connection between the girder 10 and the girder 10 with concrete or the like (not shown) May further include).

Since the expansion joint is a well-known technique, detailed description thereof will be omitted.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, it will be understood that various modifications and other embodiments are possible to those skilled in the art.

 The present invention as described in detail above can form a notch portion in the upper part of the girder to accommodate the anchorage to which the secondary tension member is fixed, so that the intermittent bridge or the continuous bridge can be easily secondary tensioned, and the crossbeams to reinforce the aged bridge after a long time The installation and post maintenance can be easily made by installing the fixing fixture for post maintenance and forming a hole through which steel wire passes.

Claims (14)

A plurality of primary tension members (11) is inserted or can be inserted, the girders (10) formed with a notch (14) for receiving the anchorage 13 is fixed to the secondary tension member 12 is fixed on both ends of the upper side. Manufacturing step; Mounting the girder (10) on the piers (20); Installing a crossbeam on the girder (10) for connecting the girder (10) in the transverse direction; Inserting and fixing a secondary tension member (12) in the anchorage (13); Constructing a bottom plate 40 on the girder 10 except for the notch 14; Tensioning the secondary tension member (12) installed through the anchorage (13) of the notch (14); And PS simple girder bridge construction method comprising the step of finishing by filling the bottom plate 40 including the notch with concrete or the like. The method of claim 1, wherein in the step of constructing the bottom plate (40), the bottom plate (40a) is cast and cured in the field. The method of claim 1, wherein in the step of constructing the bottom plate (40), the bottom plate (40b) is precast. The method of claim 1, wherein in the step of constructing the bottom plate 40, the concrete is placed on the top surface of the precast bottom plate and cured in the state in which the precast bottom plate is installed in the bottom plate 40c. Construction method of PS simple girder bridge to make. The method of claim 1, wherein in the step of forming the cross beam 15 in the girder 10, the PS C simple, characterized in that to form a hole 15b through which the post-maintenance fixing unit 15a and the steel wire pass. Construction method of girder bridge. A furnace in which a plurality of primary tension members 11 are inserted or made to be inserted therein, and arranged in two or more spans, in which a fixing unit 13 in which the secondary tension members 12 are fixed is disposed above the outermost end of the span. Manufacturing the girder 10 in which the teeth 14 are formed (S10); Mounting the girder (10) on a plurality of piers (20) (S20); Installing a cross beam (15) on each girder (10) for connecting the girders (10) in the transverse direction (S30); Continuously inserting the secondary tension member 12 into the anchorage 13 over the foreground (S40); Connecting each of the girder 10 (S50); Constructing a bottom plate 40 on the girder 10 except for the notch 14 (S60); Tensioning the secondary tension member 12 installed through the fixing hole 13 of the notch portion 14 (S70); And Finishing the bottom plate 40 including the notch 14 with concrete or the like (S80); PS continuous girder bridge construction method comprising a. The method according to claim 6, further comprising a secondary tension step for structurally continually girder 10 by partially tensioning the secondary tension member 12 after each connecting between the girders 10. Mr. continuous girder bridge construction method. The method of claim 6, wherein the construction of the CS continuous girder bridge, characterized in that the bottom plate (40a) in the field pouring and curing in the step of constructing the bottom plate (40). 8. The method of claim 6, wherein the bottom plate 40b is precast in the step of constructing the bottom plate 40. The method according to claim 6, wherein in the step of constructing the bottom plate 40, the concrete is placed and cured on the upper surface of the precast bottom plate with the precast bottom plate installed in the bottom plate 40c. Construction method of PS continuous girder bridge to assume. 8. The construction of the CS continuous girder bridge according to claim 6, wherein the cross beam is formed in the girder 10 so as to form a post-maintenance fixing fixture 15a and a hole 15b through which the steel wire passes. Way. The method of claim 6, further comprising an expansion joint installation step after finishing the bottom plate 40 including the notch 14 with concrete or the like. 12. The construction of the CS continuous girder bridge according to claim 11, wherein the post-maintenance fixing unit 15a is installed in a bridge that has been used for a long time and the steel wire is inserted into the hole 15b through which the steel wire passes. Way. PS continuous girder bridge, characterized in that produced by the construction method of claim 6.

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