KR100603901B1 - Girder bridge construction make use of a part existing girder and that execution method - Google Patents

Abstract

The present invention is to install and improve the rigidity by utilizing the existing girder to ensure the safety of the bridge by the aging and change of design standards of the railway bridge made of steel bridge,

More specifically, it is manufactured in a box-shaped lightweight structure using steel of the existing girder to minimize the reinforcement of bridges, and induces the plate-shaped bridge using the existing girder of economical structure that is not affected by the fatigue life of concrete-embedded girders. It relates to the phase structure and construction method.

The present invention comprises a conventional girder to form a perforated hole in the upper side of the I-beam to install transverse reinforcement and sheath pipe and to form a plurality of through holes in the entire surface of the I-beam to reinforce the reinforcement; A bottom reinforcing plate for reinforcing a lower portion of the existing girder by applying a bridge bearing and an adhesive;

A lower slab and an upper slab formed with a groove on an interface of the protruding girder and integrally formed;

Removing the existing girder is characterized in that the gravel and sleepers and rails are installed on the upper slab.

Railway plate bridge, reinforced concrete, slab, PC steel wire, PC composite bridge, plate bridge bridge

Description

Girder bridge construction make use of a part existing girder and that execution method}

1 is a front view of the installation state for the existing girder

Figure 2 is a side view of the installation state for the existing girder

3 is a perspective view of the installation state for the existing girder

4 is a front view of the perforation and reinforcement of the girder of the present invention

Figure 5 is a side view of the perforation and reinforcement of the girder of the present invention

Figure 6 is a perspective view of the perforation and reinforcement of the girder of the present invention

Figure 7 is a front view of the state reinforcement to the existing girder in the present invention

Figure 8 is a side view of the reinforcement state in the present invention

9 is a perspective view of the reinforcement state in the present invention

10 is a front sectional view of a completed slab in the present invention;

Figure 11 is a side view of the completed state of the slab of the present invention

12 is a perspective view of a completed slab in the present invention

13 is a front view of a state in which the protruding girder is removed and the epoxy is coated in the present invention;

Figure 14 is a side view of a state in which the protruding girder is removed and the epoxy coating in the present invention

Figure 15 is a perspective view of a state in which the protruding girder is removed and the epoxy coating in the present invention

16 is a front view showing a completed state of the present invention;

17 is a side view showing a completed state of the present invention

18 is a perspective view showing a completed state of the present invention

[Description of Symbols for Main Parts of Drawing]

10: Original girder 11: sleepers

12: rail 13: I-beam

14 hole punch 15 vertical reinforcement plate

16: bridge bearing 17: bridge device

18: side reinforcement plate 19: rebar through hole

20: horizontal rebar 21: floor reinforcement plate

22: formwork 23: rebar

24 abdomen 25 lower slab

26: space 27: sheath tube

28: upper slab 29: outer wall

30: groove 31: protrusion girder

32: adhesive 33: epoxy

34: upper slab bottom plate 35: bridge sidewalk

36: icon gravel

The present invention is to install and improve the rigidity by utilizing the existing girder to ensure the safety of the bridge by the aging and change of design standards of the railway bridge made of steel bridge,

More specifically, it is manufactured in a box-shaped lightweight structure using steel of the existing girder to minimize the reinforcement of bridges, and induces the plate-shaped bridge using the existing girder of economical structure that is not affected by the fatigue life of concrete-embedded girders. It relates to the phase structure and construction method.

In general, there are a lot of steel bridges in the form of ballistic tracks, which are difficult to maintain, compared to reinforced concrete bridges. Railway bridges have been under construction for many years. Such improvement methods include methods of reinforcing induced ignition or steel bridges and improving tracks.

An induction phase refers to a state in which a rail, a sleeper and gravel supporting the rail are laid in a railway bridge. A ballless phase refers to a state in which gravel is not laid in the above.

In general, railroad bridges constructed in the past are steel bridges that pass through rivers or valleys, and most railway bridges that are not installed on the ground are constructed as martial arts steel bridges as shown in FIG.

Conventional railway bridges are supported by a sleeper (11) in which a pair of rails (12) are installed in the longitudinal direction in parallel in the width direction at regular intervals, the existing girder (10) is supported in the longitudinal direction at the bottom of the sleeper In the upper position of the alternating or pier of the existing girder 10, the bridge device 17 is installed.

Such a conventional railway bridge is to improve the adhesion to the concrete by grinding the base surface of the girder, drill holes for reinforcement in the girder, reinforce the reinforcement through the perforated holes and install the slab formwork, It supports the steps of leveling the ground and removing stumbling blocks under the pier, and supports the grouping supporters.Place concrete on the slab formwork, cut the girder protrusion exposed to the top of the slab after demolding the supporter and formwork after curing, Waterproofing of the slab is completed by induction ignition on the slab with gravel.

However, this conventional structure method may cause problems in structural stiffness due to cracking and material separation of the slab because the vehicle must be driven over the railroad during slab casting and curing.

In order to prevent such defects, as in Patent No. 415768 (January 16, 2004), the construction is performed while preventing the vibration impact caused by the dynamic load of the train during the induction burn construction, and solves the problem of installing the club from the ground. The construction is done by the prefabricated brackets installed on the piers, and the construction is good by moving the system while moving step by step for the induction as an assembly / disassembly hypothesis structure.

Specifically, the conventional structure of a pair of rails installed in parallel in the longitudinal direction is supported by a wooden sleeper installed in a width direction at a predetermined interval, and a girder is supported in the lower longitudinal direction of the sleeper. In the ordinary railway bridge with a bridge device intersects with or on the upper part of the bridge, the existing girder is to be removed,

Hydraulic jack support brackets installed on each shift or piers;

First hydraulic jacks installed on both upper surfaces of the bracket via height reinforcing members;

A pair of second girders for supporting a train load having a length of each pier interval in which the first hydraulic jacks are installed and mounted on an upper portion of the first hydraulic jacks;

Steel sleepers which have a predetermined interval on the upper portion of the second girder and are installed in the width direction, interposed between the respective wooden sleepers and interposed on the bottom of the rail and assembled and fixed to the second girder;

A second hydraulic jack seated on both sides of the bracket;

A pair of longitudinal members mounted on the second hydraulic jack and having a length about the respective bridge gaps in which the second hydraulic jacks are installed;

A lattice type aerial club assembled with a transverse member provided at regular intervals in a width direction of the upper surface of the longitudinal member;

A slab cured by formwork supported by the aerial club; And

It is characterized in that the structure is induced by the gravel filling between the sleepers and the slab.

However, this conventional structure is time-consuming for the installation and disassembly of aerial clubs because it is necessary to install additional aerial clubs that are installed using the bridge.

Such inductive slab bridge is reduced in mechanical efficiency of the cross-section, which is about 10 to 20 times the weight of the existing plate-shaped bridge, so the workability is reduced, and reinforcement of the bridge or foundation, which is the substructure of the bridge, is necessary. Since much construction cost such as reinforcement of the lower structure may be more expensive.

The present invention has been made to solve such a conventional drawback, and aims to increase the rigidity and increase the durability and usability by utilizing the lower part of the steel plate of the existing girder of the plate shape.

An object of the present invention is to integrate the slab concrete separated by the I-beam of the existing girder to promote safety and durability.

The present invention aims to produce a lightweight structure of the box-type girders and rather to increase the rigidity so as not to be affected by the fatigue life of the girder.

The present invention comprises a conventional girder to form a perforated hole in the upper side of the I-beam to install transverse reinforcement and sheath pipe and to form a plurality of through holes in the entire surface of the I-beam to reinforce the reinforcement;

A bottom reinforcing plate for reinforcing a lower portion of the existing girder by applying a bridge bearing and an adhesive;

A lower slab, an abdomen, an upper slab and an outer wall which are formed integrally with a groove at an interface of the protruding girder;

Removing the existing girder is characterized in that the gravel and sleepers and rails are installed on the upper slab.

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

In the present invention, as shown in FIGS. 1 to 3, the girder 11 is connected to the upper side of the I-shaped beam 13 at regular intervals and a pair of rails 12 are installed on the upper side of the existing girder 10. )

Since the coating on the surface of the existing I-beam 13 of the existing girder 10 reduces the adhesion of concrete, the surface-painting of the I-beam 13 is removed and the new adhesive is applied thereto.

In the I-beam 13 of the existing girder 10, from which the painting is removed, as shown in FIGS. 4 to 5 and 6, a predetermined interval is cut to the upper side and a rectangular or circular drilling hole 14 is installed. In addition, vertical reinforcement plates 15 are provided on both sides of the drilling hole 14 in the longitudinal direction.

The perforated hole 14 is arranged by placing a plurality of transverse reinforcing bar 20 in the position where the upper slab 28 is to be placed.

The I-beam 13, in which the perforation hole 14 is not formed, drills a plurality of rebar through holes 19 and penetrates the reinforcing bar 23 therein, and reinforces the position where the abdomen 24 is to be placed.

Side end reinforcement plates 18 are installed on both ends of the I-beam 13 on the outside, and under the bridge, they are surrounded by reinforcement plates 21 such as PC or FREP (Fiber Reinforced Epoxy Panel). Is filled with an adhesive 32 such as anhydrous mortar or epoxy.

In addition, the space 26 is formed in the center of the existing girder 10 and the post tension is provided by installing the sheath pipe 27 in the transverse direction at the portion where the upper slab 28 is located inside the formwork 22. Place the PC steel wire.

After the concrete is placed, a styrofoam is inserted into a portion of the I-shaped beam 13 that is not cut to join the existing girder 10 and concrete, so that the concrete is not poured there.

The abdomen 24, the lower slab 25, the upper slab 28 and the outer wall 29 are integrally cured by concrete by the formwork 22, and then the formwork 22 is removed, while the groove portion 30 is removed. The protruding protruding girder 31 is cut and removed.

When the protruding girder 31 is removed, only the groove part 30 remains, and thus the epoxy part 33 is filled in the groove part 30 so as to prevent the integration of concrete and the leakage caused by the I-beam 13.

When the projecting girders 31 are removed, they are removed at the time of the track installation work (blocking work).

After placing the concrete, expansion concrete is used to prevent separation of the steel plate and concrete of the existing girder 10 due to dry shrinkage, etc., and care should be taken to prevent cracking during curing.

After curing of concrete is completed, the PC steel wire passing through the sheath pipe 27 is tensioned to form a tension force in the upper slab 28.

In this way, after the PC is tense, the track installation construction (blocking construction) is carried out,

Remove the existing rail 12 and the sleeper 11 and remove the projecting girder 31 and inject the epoxy 33 into the cut groove 30 to integrate the inside and outside, the upper slab 28 Epoxy 33 is sprayed on the bottom of the upper surface and urethane plate or FREP plate 34 is attached to prevent leakage and reduce vibration.

On the upper side of the upper slab 28, the gravel 36 is sprayed and the sleepers 11 and the rails 12 are installed, and the track installation work is finished through rearranging.

And one side or both sides of the outer wall 29 can be further provided with a bridge sidewalk (35).

The present invention is to provide a structure to increase the rigidity and increase the durability and usability by utilizing in the state of installing the I-beam 13 of the existing girder 10 as it is.

During construction, trains do not need to slow down or block other than the track installation, and the lower slab 25, the abdomen 24, the upper slab 28 and the outer wall 29 are integrated by the existing girder 10 for safety and durability. To promote it.

Post-tension with a PC steel wire installed in the sheath pipe 27 of the concrete slab to prevent the transverse tension in the slab concrete.

A perforated hole 14 is formed inside the I-beam 13, and vertical reinforcement plates 15 are installed on both sides to reinforce the slab, and the slab is integrated in the transverse direction through the reinforcement of the transverse steel 20. In preparation for the transfer of tracks, the slabs (24, 25, 28) are allowed to leave the height.

Since the slab (24, 25, 28, 29) is formed into a box-shaped lightweight structure can minimize the bridge reinforcement, and can effectively resist torsional resistance and meandering movement of the train.

Since the existing girder 10 is located inside the slabs 24, 25 and 28, there is no need for maintenance, such as painting, and it is lighter than the slab girder in induction and the rigidity is rather large so that the existing girder 10 is embedded with concrete. It provides an economical structure that is not affected by fatigue life.

The upper slab 28 is tensioned through the PC steel wire, it is possible to re-tension when the rigidity is reduced, there is no need for a temporary road for the installation of girder, workshop, large cranes, the construction work for pushing, etc. Since it is not necessary, the construction cost can be drastically reduced.

Hereinafter, the present invention will be described in detail through specific examples.

EXAMPLE

(One). Existing girder removal step

In order to increase the adhesion of the I-beam 13 and the concrete of the existing girder 10, the surface of the coating is removed and a new adhesive is applied thereto.

(2). Beam drilling step

A side of the I-beam 13 is drilled to form a plurality of rebar through holes 19 to reinforce the reinforcing bar 23.

(3). Beam drilling and reinforcement steps

In order to integrate the lower slab 25, the abdomen 24 and the upper slab 28, the perforated holes 14 are formed at the position where the upper slab 28 is to be cast and the vertical reinforcement plate 15 for reinforcement on both sides thereof. And install a plurality of transverse reinforcing bar 20 and the sheath pipe 27 through the drilling hole 14 to reinforce the transverse reinforcing bar 20.

(4). Lower reinforcement stage of the girder

The bottom side of the existing girder 10 is surrounded by a bottom reinforcement plate 21 made of PC or FREP, etc. and the bridge support 16, and filled with non-contraction mortar or epoxy therein to reinforce the lower side and maintain the existing girder 10. No maintenance is required.

(5). Formwork Installation Steps

As shown in FIG. 7, the mold 22 is installed so that the upper slab 28, the outer wall 29, and the abdomen 24 are integrally molded.

(6). Concrete pouring steps

Styrofoam or the like is inserted to form the groove part 30 and the concrete is poured into the mold 22 to cure.

The concrete uses expanded concrete to prevent separation from the I-beam 13 due to dry shrinkage, etc. after casting, and care should be taken to prevent cracking during curing.

(7). Tension Introduction Stage

After curing of concrete is completed, tension is applied to the upper slab 28 by tensioning the PC steel wire.

(8). Extruded girder removal steps

Removing the formwork 22 and cutting the protruding girder 31 protruding without being embedded in concrete to remove the sleepers 11 and the rail 12 together.

(9). Upper slab finishing stage

Inject epoxy 33 into the groove 30 to integrate the inside and outside, spray epoxy on the inner bottom of the upper slab 28, and attach urethane plate or FREP plate 34 on it to prevent leakage and I type The vibration reduction effect of the beam 13 is aimed at.

(10). Steps for installing gravel, sleepers and rails

The gravel 36 is sprayed into the upper side of the upper slab 28, and the sleeper 11 and the rail 12 are installed and finished.

The present invention is to utilize the existing girder as it is to provide the effect of increasing the rigidity and durability and usability.

The present invention does not need to slow down and block trains other than the track installation work, and provides an effect of increasing safety and durability by integrating the slab by the existing girder.

The present invention provides the effect of preventing the transverse tension in the slab concrete by post-tensioning with a PC steel wire installed in the sheath tube of the concrete forming the slab.

The present invention forms a perforated hole in the beam, and in order to reinforce the vertical reinforcement plate on both sides to reinforce the slab in the transverse direction through the reinforcement of the transverse reinforcement, to provide a margin to the height of the slab in preparation for the transfer of the track Positioning effect.

The present invention can be manufactured in a lightweight structure by molding the slab into a box-shaped structure to minimize the bridge reinforcement, and to effectively resist torsional resistance and meandering motion of the train.

The present invention does not require maintenance, such as painting because the existing girder is located in the interior of the slab, economical structure that is lighter than the slab girder in induction and rigidity is rather large and is not affected by the fatigue life of the existing girder embedded in concrete To provide.

The present invention is tensioned through the PC steel wire inside the slab, it is possible to re-tension when the rigidity is lowered, there is no need for a construction road for the girder installation, workshop, large-scale crane, the construction for pushing, etc. It is an invention that can significantly reduce construction costs because it is not necessary.

Claims (4)

(delete) Removing the existing girder coating step of removing the coating of the surface and applying a new adhesive agent in order to increase the adhesion of the I-beam 13 and the concrete of the existing girder 10; A beam drilling step of drilling a side of the I-beam 13 to form a plurality of rebar through holes 19 to reinforce the reinforcing bar 23 therein; In order to integrate the lower slab 25, the abdomen 24, and the upper slab 28, a perforation hole 14 is formed in the I-beam 13 at the position where the upper slab 28 is to be cast and the vertical reinforcement plate on both sides. A beam drilling and reinforcing step of installing 15 and reinforcing the transverse bars 20 by passing the plurality of transverse bars 20 and the sheath pipe 27 through the boring holes 14; A lower reinforcing step of the girder to surround the bottom reinforcement plate 21 and the bridge support 16 on the lower side of the existing girder 10 and to apply the adhesive 32 to the lower side of the girder; Installing the formwork 22 such that the lower slab 25 and the abdomen 24 are installed in the form of a box having a space 26 and integrally molded with the upper slab 28; Inserting styrofoam or the like so that the groove 30 is formed, and placing the concrete in the mold 22 to cure the concrete; After the curing of the concrete is completed, the PC steel wire is tensioned to introduce tension to the upper slab 28: Removing the formwork 22 and cutting the protruding girder 31 which is not embedded in concrete to remove the sleeper 11 and the rail 12 together; Inject epoxy 33 into groove 30 to integrate the inside and outside, spray epoxy on the inner bottom of upper slab 28, and attach urethane plate or FREP plate 34 on it to prevent leakage and I type Reducing vibration of the beam 13; And Spreading gravel (36) in the upper side of the upper slab 28 and the plate-shaped bridge guided construction method using the existing girder, characterized in that it comprises the step of installing a sleeper and a rail. (delete) (delete)

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