KR20060082970A - Girder replacement crane for railway bridge and girder replacement method using the same - Google Patents

Abstract

The present invention provides a crane for replacing a girder, comprising: a pair of bases having track wheels; Horizontal support members connecting the respective bases to each other; A hoisting means installed on the horizontal support member and coupled to the existing girder and the new girder to elevate it; And a girder replacement crane formed under the horizontal support member and including a girder accommodation space in which the new girder can be positioned. In addition, manufacturing a new girder; Mounting and maintaining the manufactured new girder on the crane; Moving the crane to a working position on a rail above the existing girder to stop the crane; Removing the rail of the upper part of the existing girder from the descending movement path of the new girder and removing the sleeper; Coupling the hoisting means of the crane to the existing girder to separate and remove the existing girder while supporting the existing girder; Seating the new girder in the existing girder position; Placing an auxiliary pedestal on top of the new girder and returning the removed rail to the original position from the downward movement path of the new girder; Withdrawing the crane from the working position; And removing the auxiliary pedestal, installing gravel on the new girder, and installing a sleeper on the bottom of the rail.

Girder, Plate, Concrete, Replace, Replace, Exchange, Crane, Girder change, Induction fire

Description

CRANE FOR REPLACEMENT OF A GIRDIR OF A RAILWAY BRIDGE AND METHOD FOR REPLACEMENT OF THE GIRDIR USING THE SAME}

1 is a cross-sectional view of a railway bridge of the prior art.

Figure 2a and Figure 2b is a front view and side view showing the installation of the hydraulic jack support bracket of the prior art and dismantling the existing teaching device.

3a and 3b is a front view and a side view showing a temporary girder mounting and installation of a new teaching device and formwork of the prior art.

Figures 4a and 4b is a front view and a side view showing the demolition of the new slab bridge production and clubbing, temporary girder, etc. of the prior art.

5 is a partially cutaway sectional view of the crane of the present invention.

6 is a cross-sectional view taken along line AA ′ of FIG. 5.

7 and 8 are cross-sectional views taken along line BB 'and line C-C' of FIG. 5.

9 is a perspective view of a concrete girder used in the present invention.

10 to 13 and 15 is a front view showing each step of the girder replacement method of the present invention.

Figure 14 is a side view of the auxiliary support used in the girder replacement method of the present invention.

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

1: rail 2: sleeper

4: Existing Discipline Device 6: Plate Girder

100: crane 102: horizontal beam

104: connecting member 112: base

114: rod 123: mounting plate

122, 124: Hoist 125, 126: Hook

130: new girder 144: auxiliary pedestal

146: New teaching device

The present invention relates to a girder replacement crane for a railway bridge and a girder replacement method using the same, and more particularly, a process of installing a new girder that is manufactured in advance after dismantling a plate girder of a railway bridge section. The present invention relates to a girder replacement crane and a girder replacement method using the same.

Many railroads in Korea include many old railway bridges (hereinafter referred to as "railroad bridges") that are approximately 30 to 100 years old. Such existing railway bridges adopt a lot of plate girders, for example, bottom plate girders. Plate girders need to be replaced due to their high noise and small supportable loads.

However, girder replacement has many difficulties. In particular, due to the nature of the work, a lot of time is required for the construction, but it is impossible to stop the vehicle operation during the construction period, and even if the number of operations is limited, the time that can be secured between the operation and the operation is very limited. . For example, in case of Gyeongbu Line, the maximum time that can be secured is about 3 hours 30 minutes to 4 hours. Therefore, the construction period is likely to be prolonged because the construction must proceed in such a way that the train operation resumes after the construction for such a limited time.

Referring to Figures 1 to 4b introduces a conventional girder replacement method.

1 to 4b introduce a girder replacement method of Korean Patent Application No. 10-2002-38867 entitled "Inventive Method by Substituting Steel Bridges of Railway Bridges by Concrete Bridges".

FIG. 1 shows a railroad bridge in a "martial arts" state, meaning that the rails or sleepers or girders supporting the rails are not covered with gravel. .

As shown in Figures 2a and 2b, the prior art method includes the process of installing a hydraulic jack support bracket 10 having a pedestal (11). The hydraulic jack 20 is installed on both sides of the pedestal 11 of the bracket (10).

Next, the horizontal bar beam 21 is installed in the width direction on both sides of the hydraulic jack 20 installed, and the pair of copper bar mold beams 30 are disposed and fixed in the bridge length direction on the upper bar beam 21, and the copper bar mold At least two or more grouped beams 31 are provided on the beam 30 in the bridge width direction.

Next, as shown in FIG. 2B, the hydraulic jack 20 is operated to lift the existing plate girder 40 to dismantle the seating device 41 and replace the seat of the existing plate-shaped girder 40 with the hydraulic jack 50 in place. Install).

As shown in Figure 3a and 3b, after removing the existing girder 40, in order to secure the space for installing the formwork for slab forming fixed to the beam 51 on the hydraulic jack 50 and the square tube 52 around the Locate it. The upper part of the beam is installed a temporary girder 60 for running the train.

Next, as shown in Figs. 4a and 4b, install the new slab scaffolding 71 and install the formwork 73 including the bottom formwork 72 of the slab on the barley crossbeam 31 and reinforce the reinforcing bar Pour and cure concrete for forming. After this, the reinforcing bar is placed in the inner tube 74, and the concrete is poured and cured to fill the slab hole.

Finally, remove the formwork, round bar cast beams, round bar beams, hydraulic jack support brackets, hydraulic jack 50 for the chair function and seat the new slab on the chair 71. Next, gravel is laid on the slab and sleepers and rails are installed.

The prior art method having the above structure has a disadvantage of requiring a lot of restrictions on the operation of the train.

First, there is a drawback that the train cutoff time for the work must be long. Removing the existing plate girders and installing temporary girders is a time-consuming task. That is, the plate girders removed from the installation position are bulky and heavy, and it takes a lot of time to move them from the railroad rail in the bridge section to the railroad rail in the comparative section and move them out of the rail. In addition, in order to ensure the safety of subsequent passing trains, careful attention must be paid to the installation of temporary girders, which is also a factor in lengthening the working time.

However, as described above, due to the domestic operation of the train is limited to 4 hours at a long time because it is difficult to complete the removal of one plate-shaped girder and the installation of subsequent temporary girder by one operation limitation, it is inevitable to limit the number of train operations.

In addition, the temporary girder is not a complete track, so trains passing over it require low speed operation. This low speed operation must continue until the end of the concrete curing process, increasing the likelihood of delays in passenger and cargo transportation.

In addition, the operation to remove the existing plate-shaped girder is subjected to a lot of work disturbance by the electric line installed in the upper portion is a cause that the work speed is slow.

In addition, the girder replacement method of the prior art has a large number of work maneuvers because it is necessary to install a support structure for supporting the hydraulic jack for lifting the existing girder and to dismantle and dismantle it again.

The present invention has been made to solve such a problem, to provide a plate girder replacement crane that can greatly reduce the train operation restriction requirements, including the train interruption or speed limit by greatly reducing the operation time of the plate girder replacement operation The main purpose is to

Still another object of the present invention is to provide a plate girder replacement method using such a crane.

A main object of the present invention described above is a girder replacement crane comprising: a pair of bases having track wheels; Horizontal support members connecting the respective bases to each other; A hoisting means installed on the horizontal support member and coupled to the existing girder and the new girder to elevate it; And it can be achieved by providing a girder replacement crane which is formed under the horizontal support member and includes a girder accommodation space in which the new girder can be positioned.

Another object of the present invention is to produce a new girder; Mounting and maintaining the manufactured new girder on the crane; Moving the crane to a working position on a rail above the existing girder to stop the crane; Removing the rail of the upper part of the existing girder from the descending movement path of the new girder and removing the sleeper; Coupling the hoisting means of the crane to the existing girder to separate and remove the existing girder while supporting the existing girder; Seating the new girder in the existing girder position; Placing an auxiliary pedestal on top of the new girder and returning the removed rail to the original position from the downward movement path of the new girder; Withdrawing the crane from the working position; And it can be achieved by providing a girder replacement method comprising the step of removing the auxiliary pedestal, laying gravel on the top of the new girder and installing a sleeper on the bottom of the rail.

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

5 and 6 show a partially cutaway side view of the girder replacement crane according to the invention and a planar cross-sectional view taken along cut line A-A 'in this side view. The crane 100 includes two bases 112 that are spaced apart from each other, a pair of horizontal beams 102 connecting the two bases 112 to each other, and a pair of two ends of the pair of horizontal beams 102 respectively coupled to each other. It includes a connecting member 104, a plurality of hoisting machine (122, 124) installed on the pair of horizontal beams, the cover 106 covering the upper portion of the crane (100).

Each base 112 includes a rod 114 therein. The rod 114 is slidable between the protruding position and the retracted position. In the preferred embodiment of the present invention, the rod 114 is configured to protrude and retract manually. Alternatively, the rod 114 may be automatically configured using a hydraulic device. The rod 114 serves to support the lower part of the new girder 130 when maintaining the new girder 130 to the crane 100 to be described later. At the outer end of the base 112, a connecting ring 116 for towing the crane 100 is formed. Traction may be effected by a separate tracked vehicle with drive force.

In addition, a pair of inner and outer wheels 108 is provided at the lower portion of the base 112 so as to move on the railway rail 1. The inner and outer wheels 108 are provided with separate braking devices (not shown).

Each transverse beam 102 extends long to couple the two bases 112 together. The lateral beam 102 has a length such that the distance between the inner wheels 108 is larger than the length of the plate-shaped girder 6, which will be described later.

Referring to FIG. 6, it can be seen that the connecting member 104 vertically connects two horizontal beams 102 and is fixed to the upper portion of the base 112.

5 and 7, the hoisting machines 122 and 124 are installed on the mounting plate 123 fixed to the pair of horizontal beams 102 so as to be movable back and forth within a predetermined range, and the hoisting machine 122 , 124 is provided with two types, a large hoist 122 and a small hoist 124. The large hoist 122 has a capacity of about 30 to 50 tons and is used to hold the new girder 130 made of concrete in the crane 100 and descend from the crane 100. The small hoist 124 has a capacity of about 5 to 15 tons and is used to pull down the existing plate girder, which is lighter than concrete, to the lower part of the piers.

In a preferred embodiment, the large and small hoists 122 and 124 have capacities of 40t and 10t, respectively. On the other hand, the large and small hoist (122, 124) has a hook 126, 125 through the wire 128.

The cover 106 covers the upper surfaces of the base 112, the horizontal beam 102, and the hoisting machines 122 and 124. The cover 106 is provided with a plurality of ventilation holes 106a.

As shown in Figure 5 and 7, the crane 100 configured in this way can be transported by positioning the new concrete girder 130 between the base 112 of the horizontal lower portion. In order to allow the crane 100 to move with the new girder 130 mounted, a space for accommodating the new girder 130 is secured under the horizontal beam 102.

The new girder 130 is supported by two rods 114 on both sides of the new girder 130 and a large traction machine 122 pulls the new girder 130 through the wires 128 on the upper side thereof. 100).

As shown in FIG. 9, the new girder 130 has a plurality of hooks 132 to which the hooks 126 of the large hoist 122 can be coupled so as to correspond to the arrangement of the large hoist 122 at regular intervals. Arranged and formed. In addition, a plurality of through holes 134 through which the hook 125 of the small hoist 124 can pass are formed in the new girder 130.

Hereinafter, a plate-type girder replacement method using the crane 100 having such a configuration is introduced.

New girder making process

The girder replacement method of the present invention is configured to produce a new concrete girder 130 in advance in a separate place and carry it to a work place for replacement. Therefore, there is no period requiring a slow running of the train according to the use of the temporary girder as in the conventional art of forming the concrete girder after curing by installing the temporary girder. The girder production is preferably chosen to be close to the place where the plate girders need to be replaced.

New girder loading process

The manufactured concrete girder 130 is mounted on the lower portion of the crane 100 as shown in FIG. At this time, the large hoist 122, the wire 128, the hook 126 of the crane 100 can provide a force to raise the girder 130 to the upper, when the girder 130 is raised to a certain height The rod 114 may protrude from the base 112 to support and fix the new girder 130 at the bottom.

Crane transport and stop process

As shown in FIG. 10, the crane 100 mounted with the girder 130 is moved to the rail section of the upper part of the existing girder 6 and stopped. When stopping, the position of the crane 100 is determined so that the concrete girder 130 is located directly above the existing girder 6. If necessary, by operating the braking device to prevent the movement of the crane (100).

Rail cutting and sleeper movement process

As shown in FIG. 11, the rails 1 are cut and the sleepers 2 are moved so that the new girder 130 does not interfere with the downward movement. The cutting of the rail 1 is made on two parts of the pair of rails located between the inner wheels 108 on both sides of the crane 100. For example, it is possible to cut two rail portions located at the top of the space between the plate girders 6 and the girders 6 and located between the inner wheels 108.

Next, the cut pair of rails 1 is removed from the existing position and stored, for example, in a direction substantially parallel to the existing rails 1 on the left side or the right side of the existing railway line below the crane 100. The girder 130 secures a movable path.

Next, remove the sleepers (2) at the bottom of the rail (1) and store them separately in an appropriate place.

Existing girder removal process

As shown in FIG. 12, the existing girder is removed using the hook 125 of the small hoist 124 of the crane 100.

First, the existing girder 6 is bundled over two parts using a wire 142. Next, the hook 125 of the small hoist 124 is lowered through the through hole 134 of the new girder 130 to connect the existing girder 6 to the bundled wires 142, respectively. Next, the plate girders 6 are cut through an oxygen cutting operation. As shown, even if the girder 6 is completely separated into two parts, the girder 6 cut by the support of the small hoist 124 does not fall to the bottom. Separation of the existing girder 6 may proceed in a variety of ways, for example, it is possible to cut at least two parts or more, depending on how to bind the wire 142.

In this state, the hook 125 of the small hoist 124 is slowly lowered to remove the existing girder 6 by lowering the lower portion of the piers 5. At this time, when the water is filled in the lower part of the piers can be used to collect the demolition girders (6) by using a boat, and if there is no water, the transport vehicle such as a vehicle can be waited in advance to put the demolition girders (6) on it. have. At the same time, it is possible to remove the pedestal device 4 supporting the existing girder 6. Removal of the teaching device 4 can be carried out not only at this stage but also at an earlier stage using a hydraulic jack or the like. In particular, since the girder replacement should be performed within a limited time, it is preferable that the girder replacement is performed in a preparation step or the like rather than in the process of removing the existing girder 6 and seating the new girder 130. It is preferable to be performed at the same time in the new girder loading process.

New girder mounting process

As shown in FIG. 13, a new teaching device 146 for the new girder 130 is installed and the new girder 130 is seated thereon.

First, the new chair apparatus 146 is installed in the part where the existing chair apparatus 4 was located. The installation process of the new teaching device 146 is also preferably performed using a hydraulic jack or the like at a suitable time before the girder replacement work in the same manner as the removal of the existing teaching device 4.

Next, the new girder 130 held by the crane 100 by the hook 126 and the rod 114 is retracted from the crane 100 by the rod 114 into the base 112 and the new girder 130. And remove the large hoist 122 to lower the new girder 130 onto the new scaffold 146.

Rail recovery process

It is a process of restoring the rail 1 stored and cut so that the crane 100 can move to an original position.

As shown in FIG. 14, in order to compensate for the height difference between the positioned new girder 130 and the restored rail 1, an auxiliary support 144 is installed on the new girder 130 and the rail 1 thereon. Locate it. It is also possible to use a height adjustable screw jack spot instead of the auxiliary support 144.

Crane withdrawal process

Withdraw the crane 100 in the workshop where the existing girder 6 is replaced with a new girder 130. At this time, the crane can withdraw by moving on the rail (1) returned to the auxiliary pedestal 144 or screw jack spot.

Sleeper recovery and gravel laying process

As shown in FIG. 15, while installing the sleepers 2 in the rail 1 lower position, the gravel 148 is laid on the new girder 130 and the auxiliary support 144 is removed.

Gravel compaction process

By stabilizing the installed gravel using a gravel compactor, the rail 1 is stabilized.

In this way, one girder is replaced with a new girder. The same method can be used to replace the plate girders in other sections with new concrete girders.

On the other hand, by replacing the one-span rail containing the cut portion with a new one, eliminating the cut portion in the rail section can increase the stability of the track. Such one-span rail replacement work is preferably performed after one girder replacement is performed, but it is possible to reduce the material cost by performing a plurality of girder replacements.

According to the present invention, it is necessary to block the train operation until the crane 100 is withdrawn and gravel laying and sleeper installation are completed from the process of moving and stopping the crane 100 over the work section.

The girder replacement method of the present invention is configured to replace the existing girder after transporting the prefabricated concrete girder, there is no disadvantage, such as slow running of the train required by using a temporary girder during the concrete curing process.

In addition, the girder replacement method of the present invention, since it is possible to quickly replace the work using a crane, it requires little train running slowly. In addition, the time is very short even when the train operation is blocked.

In addition, the girder replacement method of the present invention has an advantage that the electric line is not blocked and there is little fear of electric shock because it is hardly disturbed by the electric line.

Claims (14)

In the girder replacement crane, A pair of bases having track wheels; Horizontal support members connecting the respective bases to each other; A hoisting means installed on the horizontal support member and coupled to the existing girder and the new girder to elevate it; And A girder accommodation space formed below the horizontal support member and in which the new girder can be positioned Girder replacement crane comprising a. 2. The girder replacement crane according to claim 1, wherein each base further comprises a rod slidable between a protruding position protruding from the base and a retracted position retracted into the base so that the new girder can be supported on the upper surface. The girder replacement crane according to claim 1, wherein the hoisting means includes a plurality of hoists installed on the horizontal support member, wires wound on the hoisters, and hooks connected to the wire ends. The girder replacement crane according to claim 3, wherein the new girder further includes a ring to which the hook can be coupled. The girder replacement crane according to claim 4, wherein the new girder further includes a through hole through which the hook can pass. The girder replacement crane according to claim 3, wherein the hoist is composed of hoists having two or more different capacities. The girder replacement crane according to claim 6, wherein the hoist has a hoist having a large capacity between 30 and 50t and a small capacity between 5 and 15t. The girder replacement crane according to claim 1, wherein a distance between the track wheel of one base and the track wheel of the other base is larger than the length of the existing girder. In the girder replacement method using the girder replacement crane of any one of claims 1 to 8, Manufacturing a new girder; Mounting and maintaining the manufactured new girder on the crane; Moving the crane to a working position on a rail above an existing girder to stop the crane; Removing the rail of the upper part of the existing girder from the descending movement path of the new girder and removing the sleeper; Coupling the hoisting means of the crane to the existing girder to separate and remove the existing girder while supporting the existing girder; Seating the new girder in the existing girder position; Placing an auxiliary pedestal on top of the new girder and returning the removed rail to the original position from the downward movement path of the new girder; Withdrawing the crane from the working position; And Removing the auxiliary pedestal, installing gravel on the top of the new girder and installing a sleeper on the bottom of the rail; Girder replacement method comprising a. 10. The method of claim 9, wherein the new girder is a concrete girder and the existing girder is a plate girder. 10. The method of claim 9, wherein said rail removing operation in step d) is performed by cutting two portions of a pair of rails between said track wheels and removing them from existing positions. 12. The method of claim 11, further comprising after step i) replacing one span of said rail comprising said cut portion with a new one. 10. The method of claim 9, wherein the removing of the existing girder in step e) is performed by cutting the existing girder into a plurality of parts. 10. The method of claim 9, further comprising removing the existing girder chair and installing the new girder chair between the steps b) and f).

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