KR100466017B1 - The Method of Reinforce Steel Box Girder type Bridge and The Structure thereof - Google Patents

Abstract

The present invention relates to a steel box-type mold beam reinforcement method and its structure to tension a plurality of PC steel wire in the steel box-shaped mold beam, which is the tension portion of the bridge, to reinforce the entire mold beam. In a bridge consisting of a steel box-shaped mold beam and a longitudinal rib provided on the inner bottom surface of the steel box-shaped mold beam, a predetermined distance from the one end of the mold beam to the tile end in the steel box-shaped beam along the longitudinal direction of the mold beam Installing a plurality of first reinforcement members; and installing a fixing fixture to a first reinforcement member installed at any one end of the steel box mold beam from the step; 1 installing a support anchorage in the reinforcement, and installing it between the anchorage anchorage and the support anchorage from the step Installing a plurality of first saddles on the top surface of the first reinforcement; from the step, installing a plurality of second reinforcements on the longitudinal rib top surface between the respective first reinforcement and the reinforcement; Installing a plurality of second birds at any position on the lower surface of the second reinforcing material, and from the step of fixing the PC steel wire to the fixing anchorage and at the same time alternately in the upper and lower parts of the steel box-shaped mold beam Installing a PC steel wire to the support anchorage installed in the mold beam tile stage after passing through the first and second saddles installed, and one end of the steel box mold beam to the support anchorage installed in the steel box mold beam tile stage from the step; It characterized in that it comprises a step of providing a hydraulic jack to tension the PC steel wire is installed through from the tile end to This prevents bridges from collapsing and cracks in advance, improves the performance and life of the bridges, and also facilitates the reinforcement of bridges, thereby reducing construction periods and construction costs. In addition, it is possible to improve the safety and economics of construction, and also by reinforcing the steel box-shaped mold beam while performing the function of the basic bridge, there is an effect that can prevent traffic obstacles caused by the control of the vehicle.

Description

Steel Box Girder Type Bridge and The Structure Technical Method

The present invention relates to a steel box-shaped mold beam reinforcement method and its structure, and in particular, to tension a plurality of PC steel wire (P. C Wire) in the steel box girders (steel box girder) that is the tension of the bridge The present invention relates to a steel box-shaped mold beam reinforcement method and its structure to reinforce the entire mold beam.

In general, as shown in FIG. 1A, an alternative structure 1 for a bridge includes a plurality of wells 2 installed at regular intervals on a river bed, a foundation pier 3 installed on the wells 2, It consists of a mold beam (4) placed on the foundation pier, and a top slab (5) installed on the mold beam (4), the element that determines the load-bearing element is the foundation pier (3) and the mold It is the standard of the beam 4.

Thus, the foundation pier (3) and the upper slab (5) is a reinforced concrete structure, the mold beams are Prestressed Concrete Beam Type (PC beam) (not shown) or Steel Box Girder Type (Steel Box Girder Type) Girder) (4).

Recently, Steel Box Girder Type (Steel Box Girder Type: Steel Box Girder) (4) is used a lot of reasons, as well as the use of high-strength steel, easy to assemble and fabricate, easy to install, thereby usability, It is not only excellent in stability and economical efficiency, but also designed to prevent cracking, so it is widely used due to its durability and watertightness, and its excellent resistance to impact loads and cyclic loads.

However, the bridge of the steel box-shaped mold beam 4 was also constructed to predict the traffic load of the vehicle at the time of initial construction and to withstand the passing load, but the passage of the bridge increases with the passage of the vehicle traffic over time. The maximum stress on the side of the mold beam reaches the bending fracture coefficient of the steel box, resulting in cracking and the loss of tensile resistance of the steel box at that part. As the relationship between the stress of the load and the deflection of the load is changed non-linearly, cracking and sagging occur simultaneously, and there is a problem that the bridge collapses in a moment.

In addition, there is a post tension (Post Tension) method as a known reinforcement method to compensate for the above disadvantages.

As shown in Figure 1b, the reinforcement structure 6 of the post-tensioning method is fixed anchorage 6a installed on the outer bottom surface of the steel box-shaped mold beam (4) provided between the bridge piers (3) and the bridge (3) And a support bracket 6b installed at the other tile end, and a wire end member 6c penetrated and installed at the same time as one end of the support bracket 6b and the tile fixing end 6a. It is provided in the support bracket (6b) consists of a hydraulic jack (6d) for tensioning the steel wire member (6c).

In addition, a longitudinal rib supporting the mold beams 4 is provided on the lower end surface of the steel box-shaped mold beams 4 (not shown).

However, the construction method is required to install a plurality of the reinforcement structure between the bridge pier (3) and the bridge (3) of the constructed bridge, the construction time and construction cost according to this increases, and also, steel box-shaped cast beam (4) Since it is necessary to work on the outer side of the steel wire, the installation of the hydraulic jack 6d on each of the steel wire members 6c is very difficult. As a result, the construction is delayed, and the reliability and safety of the post-installation reinforcement work are deteriorated. However, there was a disadvantage that the appearance of the bridge was not beautiful.

In addition, to repair and reinforce aging bridges, it is necessary to reconstruct existing bridges and rebuild new bridges or to expand existing bridges. It has to be detoured by roads and bridges, which has the disadvantage of causing severe traffic obstacles.

Accordingly, the present invention is to solve the conventional problems as described above, the object of the present invention, by installing a plurality of PC steel wire (P. C Wire) in the steel box-shaped mold (Steel Box Girder) of the existing bridge By reinforcing the entire beam, it is to provide a steel box-shaped mold beam reinforcement method and its structure to increase the bridge's own strength to improve the performance and life of the bridge.

Another object of the present invention is to install a plurality of birds alternately in the steel box-shaped mold beam of the existing bridge and at the same time to install a plurality of PC steel wire through the birds to reinforce the entire mold beam by tensioning the PC steel wire It is to provide a steel box-type mold beam reinforcement method and its structure to reduce the construction period and reduce the construction cost as well as easy reinforcement work of bridges.

Still another object of the present invention is to reinforce the steel box mold beam (Steel Box Girder) while performing the function of the existing bridge, to strengthen the steel box-type mold beam reinforcement method of the bridge to prevent traffic obstacles caused by the control of the vehicle and To provide that structure.

In order to achieve the above object, the steel box-type mold beam reinforcement method of the bridge of the present invention, in the bridge consisting of a steel box-shaped mold beam placed on a plurality of pier, and longitudinal ribs provided on the inner bottom surface of the steel box-shaped mold beam, Installing a plurality of first stiffeners at predetermined intervals from an arbitrary end of the mold beam to the tile end in the steel box mold beam along the longitudinal direction of the mold beam, and installed at any one end of the steel box mold beam from the step; Installing a fixing fixture in a first reinforcing member, and installing a supporting fixture in a first reinforcing member provided at the end of the steel box-shaped mold beam tile from the step; and a first installed between the fixing fixing member and the supporting fixing member from the step. Installing a plurality of first saddles on the top surface of the reinforcement, from each of said first reinforcement Installing a plurality of second reinforcements on the longitudinal rib top face between the ash and the reinforcement, from the step of installing a plurality of second birds at any position on the bottom face of the second reinforcement; Connecting and fixing the PC steel wire to the fixed anchorage, and simultaneously installing the PC steel wire to the support anchorage installed in the mold beam tile stage after passing through the first and second birds alternately installed on the upper and lower portions of the steel box-type mold beam. And tensioning the PC steel wire penetrated from one end of the steel box-shaped mold beam to the tile end by a hydraulic jack at the support fixing hole installed in the steel box-shaped mold beam tile end from the step.

In addition, the steel box-shaped mold beam reinforcement structure of the bridge of the present invention in order to achieve the above object, the bridge is made of a steel box-shaped mold beam placed on a plurality of piers and longitudinal ribs provided on the inner bottom surface of the steel box-shaped mold beam. A plurality of first stiffeners are provided at predetermined intervals from an end of the beam to the tile end in the steel box-shaped mold beams along the longitudinal direction of the mold beams, and a plurality of first stiffeners installed on the upper end surface of the first stiffeners. Saddles, a plurality of second reinforcements provided on the longitudinal rib top surface between each first reinforcement and the reinforcement, a plurality of second saddles installed at an arbitrary position on the bottom surface of the second reinforcement member, and the steel box type Fixing fixtures provided in the first reinforcement provided in any one end of the mold beam, and the PC steel wire to the fixing fixtures, and at the same time the steel PC steel wires passing through the first and second birds alternately installed in the male mold beams alternately above and below each other, and support fixtures installed at any tile end in the box-shaped mold beams to support the PC steel wires. It is done.

Figure 1a is a longitudinal section of the main portion showing a steel box-shaped cast beam of the bridge according to the prior art,

1B is an enlarged cross-sectional view of portion A of FIG. 1A;

Figure 2 is an exploded perspective view showing a peripheral configuration for explaining the steel box-shaped mold beam reinforcement structure of the bridge according to the present invention,

Figure 3a is a longitudinal cross-sectional view showing the coupling of the first reinforcement of the configuration of the steel box-shaped cast beam reinforcement structure of the bridge according to the present invention,

3B is a cross-sectional view taken along the line A-A 'of FIG. 3A;

Figure 4a is a longitudinal cross-sectional view showing the coupling of the second reinforcement of the configuration of the steel box-shaped cast beam reinforcement structure of the bridge according to the present invention,

4B is a cross-sectional view taken along the line B-B 'of FIG. 4A.

Figure 5 is a longitudinal cross-sectional view showing a coupling state of the steel box-shaped mold beam reinforcement structure of the bridge according to the present invention,

6 is an enlarged cross-sectional view of portion B of FIG. 5;

Figure 7 is a flow chart showing a steel box mold beam reinforcement method of the bridge according to the present invention.

<Explanation of symbols for the main parts of the drawings>

12: steel box mold beam 14: longitudinal rib

21, 23: 1st, 2nd reinforcement 22, 24: 1st, 2nd saddle

25: fixed fixture 26: support fixture

27: Support Bracing 28: PC Steel Wire

29: hydraulic jack

Hereinafter, a steel box-type mold beam reinforcement method and its structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is an exploded perspective view showing a peripheral configuration for explaining the steel box-shaped mold beam reinforcement structure of the bridge according to the invention, Figure 3a is a combination of the first reinforcement which is a configuration of the steel box-shaped mold beam reinforcement structure of the bridge according to the present invention 3B is a cross-sectional view taken along line AA ′ of FIG. 3A, and FIG. 4A is a longitudinal cross-sectional view illustrating a combination of a second reinforcing material which is a configuration of a steel box-shaped mold beam reinforcement structure of a bridge according to the present invention. 4B is a cross-sectional view taken along line BB ', and FIG. 5 is a longitudinal cross-sectional view illustrating a coupling state of a steel box-shaped mold beam reinforcement structure of a bridge according to the present invention, and FIG.

As shown in Figs. 2 to 6, the bridge 10 is a steel box girder (12) placed on a plurality of bridges (11) and the upper slab installed thereon It consists of (13), the longitudinal rib 14 is provided along the longitudinal direction of the mold beam 12 on the inner bottom surface of the steel box-shaped mold beam 12.

The steel box-shaped mold beam 12 reinforcement structure 20 of the bridge 10 has a plurality of first and second reinforcements 21 and 23, first and second saddles 22 and 24, and fixed fixing holes ( 25), support anchoring hole 26, PC steel wire 28, and hydraulic jack 29.

The plurality of first stiffeners 21 are installed in the steel box mold beam 12 at regular intervals along the length direction of the mold beam 21 from any one end in the steel box mold beam 12 to the tile end. have.

In addition, the coupling groove 21a is formed on the bottom surface of the first reinforcing material 21 to be fixed to the longitudinal rib 14.

The first saddle 22 is installed on the upper end surface of the first reinforcing material 21 to allow the PC steel wire 28 to be described later to pass upward.

The plurality of second stiffeners 23 are upper ends of the longitudinal ribs 14 between the respective first stiffeners 21 and the stiffeners so that they can be alternately installed with the first saddle 22 of the first stiffeners 21. It is installed on the surface.

The second saddle 24 is installed on the bottom surface of the second reinforcing member 23 so as to pass the PC steel wire 28 to be described later.

In addition, the first and second reinforcing materials 21 and 23 are provided with a plurality of support bracings 27 to fix the first and second reinforcing materials 21 and 23.

In addition, the first and second saddles 22 and 24 are curved to facilitate the passage of the PC steel wire 28 to be described later.

Guide holes 22a and 24a are formed in the first and second saddles 22 and 24 to guide the PC steel wire 28 to be described later.

In addition, the first and second saddles 22 and 24 are coupled to the first and second reinforcement members in accordance with the fastening of the high tension bolt 100 and the fixing nut 200.

The fixing fixture 25 is provided in the first reinforcing material 21 provided at any one end of the steel box-shaped mold beam 12 so as to fix any one end of the PC steel wire 28 to be described later.

The PC steel wire 28 is installed through the first and second saddles 22 and 24 so as to be connected to the fixing fixture 25 so that they can be installed alternately up and down.

The support fixture 26 is provided on the first reinforcing member 21 provided at any tile end in the steel box mold beam 12 so as to support the PC steel wire 28.

The hydraulic jack 29 is provided in the support fixing hole 26 to tension the PC steel wire 28.

Then, the operation of the steel box-shaped mold beam reinforcement structure of the bridge according to an embodiment of the present invention having the above configuration will be described in more detail with reference to FIGS. 2 to 6.

First, as shown in FIGS. 2 and 5, a bridge 10 made of steel box girders 12 is formed of a steel box mold beam 12 on a plurality of bridges 11. The upper plate slab 13 is installed thereon, and the longitudinal ribs 14 are installed on the inner bottom surface of the steel box-shaped mold beam 12.

In this state, as shown in FIGS. 3A and 3B, the steel box-shaped mold beam 12 has a plurality of predetermined intervals from the one end of the mold beam 21 to the tile end along the longitudinal direction of the mold beam 21. First reinforcing materials 21 are installed.

At this time, since the coupling groove 21a is formed in the lower portion of the first reinforcing material 21 so as to be fixed to the longitudinal rib 14, the coupling groove 21a is coupled to the longitudinal rib 14 and installed.

At this time, the fixing box 25 which can fix any one end of the PC steel wire 28 to the first reinforcing material 21 provided at any one end of the steel box-shaped mold beam 12.

In this state, a support fixing hole 26 capable of connecting the PC steel wire 28 to the first reinforcing material 21 installed at the tile end of the steel box mold beam 12 is installed.

In this state, a plurality of first saddles 22 are installed on the upper end surfaces of the first reinforcing members 21 installed in the fixing fixing holes 25 and the supporting fixing holes 26.

As shown in FIGS. 4A and 4B, a plurality of second reinforcing members 23 are installed on the top surface of the longitudinal ribs 14 between the respective first reinforcing members 21 and the reinforcing members 21.

In this state, a plurality of second saddles 24 are installed at any position of the lower surface of the second reinforcement 23.

In this state, any one end of the fixing fixture 25 and the PC steel wire 28 is fixed.

The PC steel wire 28 connected to the lower portion of the fixing fixture 25 passes through the second saddle 24 of the second reinforcement 23 installed first. Then through the first saddle 22 provided on the upper surface of the first reinforcing material 21 and again through the second saddle 24 provided on the lower surface of the second reinforcing material (23).

As described above, the PC steel wire 28 passes through the first and second saddles 22 and 24 alternately installed at upper and lower sides of the steel box-shaped mold beam 12 at regular intervals, and then the steel box-shaped mold beam ( 12) Install the PC steel wire 28 to the support fixture 26 installed on the tile end.

In addition, the hydraulic jack 29 to tension the PC steel wire 28 penetrated from one end of the steel box-shaped mold beam 12 to the tile end to the support fixing hole 26 installed on the steel box-shaped mold beam 12 tile end. ).

As shown in FIG. 6, when the PC steel wire 28 is tensioned at the end of the steel box-shaped mold beam 12 by using the hydraulic jack 29, the PC steel wire 28 is first and second, respectively. The second reinforcement 23 provides a compressive force from bottom to top at the same time as it passes through the saddles 22 and 24, and the first reinforcement 21 is also provided with a compressive force from top to bottom to provide the first force. , Through the two reinforcing materials (21, 23) can reinforce the whole of the steel box-shaped mold beam 12 at a time by the organic compression force.

In this state, the PC steel wire 28 tensioned by the hydraulic jack 29 is fixedly seated with an arbitrary fixing bracket.

Then, the operation of the steel box-shaped mold beam reinforcement method of the bridge according to an embodiment of the present invention having the above configuration will be described in more detail with reference to FIG. 7.

First, as shown in Figure 7, the bridge 10 consisting of a steel box girder (steel box girder) (12) is placed on a plurality of bridges 11, the steel box-shaped mold beam 12 An upper plate slab 13 is installed thereon, and a longitudinal rib 14 is installed on the inner bottom surface of the steel box mold beam 12.

In this state, a plurality of first stiffeners 21 are installed in the steel box mold beam 12 at predetermined intervals from any one end of the mold beam 21 to the tile end along the longitudinal direction of the mold beam 21. (S1)

In this state, the fixing fixture 25 is installed in the first reinforcing material 21 provided at any one end of the steel box mold beam 12. (S2)

Then, the support fixing hole 26 is installed in another first reinforcement 21 installed at the tile end of the steel box mold beam 12. (S3)

In this state, a plurality of first saddles 22 are installed on the upper end surface of the first reinforcing material 21 installed between the fixing fixing holes 25 and the supporting fixing holes 26. (S4)

Then, a plurality of second stiffeners 23 are installed on the top surface of the longitudinal ribs 14 between the respective first stiffeners 21 and the stiffeners (S5).

In this state, a plurality of second saddles 24 are installed at any position of the lower surface of the second reinforcing material 23 (S6).

First and second saddles 22 and 24 alternately installed on the upper and lower portions of the steel box-shaped mold beam 12 while simultaneously fixing and fixing the PC steel wire 28 to the fixing fixing hole 25 in this state. After passing through and install the PC steel wire 28 to the support fixing hole 26 installed in the mold beam tile end. (S7)

Then, the hydraulic jack 29 to tension the PC steel wire 28 penetrated from one end of the steel box-shaped mold beam 12 to the tile end to the support fixing hole 26 installed in the steel box-shaped mold beam 12 tile end. (S8)

In this way, by installing the birds alternately in the steel box-shaped mold beam installed in the existing bridge 10 by reinforcing the entire bridge 10 through a plurality of PC steel wire 28 installed through the birds, the bridge 10 ) Reinforcement work is easy, and it can save construction period and cost.

Steel box-type cast beam reinforcement method and the structure of the bridge of the present invention described above is not limited to the above-described embodiments and drawings, various substitutions, modifications and changes within the scope not departing from the technical spirit of the present invention The possibility will be apparent to those of ordinary skill in the art.

As described above, according to the steel box-type mold beam reinforcement method and the structure according to the present invention,

By reinforcing the entire bridge through a number of PC steel wires in the steel box mold beam of the existing bridge, it prevents the bridge from sagging and cracking, and prevents the bridge from collapsing, and also improves the performance and life of the bridge. This makes it easy to reinforce the construction, which not only reduces the construction period and construction cost, but also improves the safety and economical efficiency of the construction. It is possible to prevent traffic obstacles due to the effect of the beautiful appearance of the bridge.

Claims (5)

In the bridge consisting of a steel box-shaped mold beam placed on a plurality of pier, and longitudinal ribs provided on the inner bottom surface of the steel box-shaped mold beam, Installing a plurality of first stiffeners at predetermined intervals from the one end of the mold beam to the tile end in the steel box mold beam along the longitudinal direction of the mold beam; Installing a fixing fixture in the first reinforcing material installed at any one end of the steel box mold beam from the step; Installing a support fixture to the first reinforcement installed in the steel box mold beam tile end from the step; Installing a plurality of first saddles on an upper end surface of the first reinforcement installed between the fixing fixture and the supporting fixture from the step; Installing a plurality of second stiffeners on the longitudinal rib top surface between each of the first stiffeners and the stiffeners from the step; Installing a plurality of second saddles between the distal ends at any position on the lower surface of the second reinforcement from the step; The PC steel wire from the step through the first and second saddles alternately installed in the upper and lower parts of the steel box-shaped mold beams and connected to the fixing fixtures and at the same time, the PC steel wire to the support anchorages installed in the mold beam tile ends Installing it, A steel box type bridge comprising the steps of: tensioning the PC steel wire penetrated from one end of the steel box mold beam to the tile end by a hydraulic jack at a support fitting installed in the steel box mold beam tile end from the step Mold beam reinforcement method. In the bridge consisting of a steel box-shaped mold beam placed on a plurality of pier, and longitudinal ribs provided on the inner bottom surface of the steel box-shaped mold beam, A plurality of first stiffeners installed in the steel box mold beam at predetermined intervals from an end of the mold beam to the tile end along the longitudinal direction of the mold beam; A plurality of first saddles installed on the first reinforcement top surface; A plurality of second reinforcing members installed on the longitudinal rib top surface between each of the first reinforcing members and the reinforcing members; A plurality of second saddles installed at an arbitrary position of a lower surface of the second reinforcing member, A fixed fixture installed in a first reinforcement provided at any one end of the steel box mold beam, A PC steel wire penetrating the first and second birds installed in the steel box-shaped mold beam alternately up and down while fixing the PC steel wire to the fixing fixture; A steel box-shaped mold beam reinforcement structure of a bridge, characterized in that the support box is installed on any tile end in the steel box-shaped mold beam and supports the PC steel wire. The method of claim 2, The first and second reinforcement, steel box-shaped cast beam reinforcement structure, characterized in that a plurality of support bracing is installed to support the first and second reinforcement. The method of claim 2, The steel box-shaped mold beam reinforcement structure of the bridge, characterized in that the coupling groove is formed in the lower portion of the first reinforcement, the coupling groove is fixed to the longitudinal rib. The method of claim 2, The first and second saddles are composed of curved first and second saddles, and the first and second saddles have a guide hole for guiding the PC steel wire in the first and second saddles. Shaped beam reinforcement structure.