KR20200010021A - Short girder launching system using count weight and intermediate transverse rail, girder construction method using it - Google Patents

Abstract

The present invention relates to a short girder launching system using a counterweight and a middle transverse rail. The short girder launching system includes: tower supports combined with the upper part of piers of a bridge; transverse rails combined with the upper part of the tower supports to be installed in a transverse direction; a main truss installed on the transverse rails in a vertical direction and including a pair of left and right trusses; roller assemblies including rollers installed between the transverse rails and the main truss to be able to be moved on the transverse rails in a transverse direction while enabling the main truss to be moved in a vertical direction; and a front winch installed on the front and a rear winch installed on the back, the winches which are installed between the pair of the trusses of the main truss to be able to be moved in a vertical direction. According to the present invention, a counterweight is installed behind the main truss, and a middle transverse rail is installed to be applied as a support spot to reduce scale much more than equipment of an existing girder launching system, and thus, the weight of the girder launching system is significantly reduced to decrease a load applied to piers, thereby enabling a girder to be safely installed and lowering expenditure for the girder launching system. Also, since time for the assembly and dismantlement of equipment is shortened, an economic feasibility can be improved. Moreover, since the dead-weight of the girder launching system is considerably reduced, periods for girder construction can be shortened with an increase in the self-propulsion velocity of the main truss, and thus, an economic feasibility can be enhanced with reduction in the entire construction period.

Description

Short girder launching system using count weight and intermediate transverse rail, girder construction method using it}

The present invention relates to a short girder launching system using a count weight and an intermediate transverse rail and a method for constructing a girder using the same, and more specifically, to a short girder launching system using a count weight and an intermediate transverse rail, the length of a conventional girder runging system is greatly reduced. The present invention relates to a shot girder launching system using a count weight and an intermediate transverse rail, and a method for constructing a girder using the system to hypothesize a girder on an upper part of a pier (including shifts).

In general, bridges are structures that are constructed across roads, rivers, valleys, and the like, and are composed of bridges (including shifts), girders, slabs, and the like. These bridges first construct piers at regular intervals in the longitudinal direction, mount girders on these piers, and then construct slabs on top of the girders.

Normally the pier is constructed directly in the field, the girders are mounted to the pre-fabricated to the upper side of the pier. A girder launching system is known for mounting girders on top of piers.

For example, Korean Patent No. 10-1239621, 'Beam Launching Method' is known (see FIGS. 7A and 7B). This prior art is provided with "cross rail 150 and the under roller 160 to the bridge 210, the front end and the rear end bottom is formed so that the height gradually increases toward the middle portion between the tip and the rear end The roller guide part 300 formed in the shape of a curved downward parabola having the largest height in the middle part launches the beam launcher 100 mounted on the bottom of the front and rear end struts 170 and 180 to be supported by the under roller 160. Beam launching method using an end strut formed with a roller guide portion (see claim 1), characterized in that it comprises a step of making a simple, the inclination angle of the front end struts and rear end struts installed on the front and rear of the mold truss is simplified. It can be adjusted in the field while preventing the launch of the mold truss 110, so that the safe and efficient launching of the mold truss And a launching beam method provided with a roller guide strut end portion is formed for that purpose.

However, since the mold truss 110 is a very large scale having a length of at least two spans and a length of about 120 to 130 m, the conventional truss 110 takes a lot of time and money to assemble, operate and dismantle the equipment. In addition, there is a problem in that a large load is added to the piers due to the weight of the equipment itself and the weight of the moving girders of the large seedlings. In addition, by carrying the girder by reciprocating back and forth using the equipment of large seedlings, the time required for the mounting of the girder is long, the overall construction period and construction cost increases.

Therefore, by greatly reducing the size of the girder launching system, stability is increased by reducing the load transmitted to the piers, and the construction time, construction cost is reduced by shortening the assembly, operation and dismantling period of the equipment, and the lifting period of the girder is increased. There is a demand for the development of a technology that can shorten the construction cost and construction period.

Patent 1: Republic of Korea Patent Registration 10-1239621

In order to solve the above problems, the present invention is to reduce the size of the girder launching system, the assembly, operation and Short girder launching system using count weights and intermediate transverse rails and construction method using the same, which reduces the dismantling time, reduces the load on the piers, reduces construction time and cost, and increases construction stability. .

In addition, as the main truss continues to move forward, the girder is lifted and mounted from the lower side of the pier to shorten the construction period and construction cost of the girder. To provide a method.

Short girder launching system using a count weight and an intermediate transverse rail according to an embodiment of the present invention, the tower supports coupled to the upper side of the bridge piers; Transverse rails installed in the transverse direction coupled to the upper side of the tower supports; Main trusses which are installed in the longitudinal direction on the upper side of the transverse rails including a pair of left and right trusses; Roller assemblies installed between the transverse rail and the main truss, the roller assemblies including rollers which are movable in the transverse direction on the transverse rail and move in the longitudinal direction; And a front winch installed at the front and a rear winch installed at the rear to be installed between the pair of trusses of the main truss to be movable in the longitudinal direction.

In addition, the main truss is shorter than two spans and longer than one span of the bridge, the weight of the weight is installed in the rear, the intermediate transverse rail is installed in the middle of the roller assembly is installed in the middle of the first span where the installation of the girders is completed It is additionally installed on the upper side of the girders and is supported by the roller assembly on the intermediate transverse rail when the main truss advances to the second span, which is the front of the next to install the girders, and the load is applied backward by the count weight. It may be characterized by being able to move forward without being dropped.

In addition, the intermediate transverse rail may be installed by lifting after lifting from the lower side before the main truss advances to the second span, the next span.

According to one embodiment of the present invention, a girder construction method using a short girder launching system using a count weight and an intermediate transverse rail includes: tower supports coupled to upper sides of bridges of a bridge; Transverse rails which are coupled to the upper side of the tower supports installed in the transverse direction; A main truss which is installed in the longitudinal direction on the upper sides of the transverse rails and includes a pair of left and right trusses, which is shorter than two spans and longer than one span of the bridge, and has a weight of weight installed at the rear thereof; Roller assemblies installed between the transverse rail and the main truss, the roller assemblies including rollers which are movable in the transverse direction on the transverse rail and move in the longitudinal direction; A front winch installed at a front side and a rear winch installed at a rear side between the pair of trusses of the main truss, the front winch being installed at the front, and the rear winch being installed at the rear of the main truss. A step of fixing the front winch to the second transverse rail above the second piers after the girders are installed in the first span formed by the second piers positioned in front of the second piers; Moving the rear winch to the middle of the first span to lift the intermediate transverse rail on which the roller assembly is installed, and rotating the rear winch to install the upper side of the girders installed in the first span; Moving the rear winch toward the countweight behind; Advancing the main truss to a second span formed by a third pier positioned in front of the second pier and the second pier; 5, steps for installing the second span to the second angle of intersection and the third angle of intersection formed by the lifting girders by using the front and rear winch winch of the main truss; may be carried out in the order.

The method may further include a fixing step of fixing the main truss to the second transverse rail on the upper side of the second pier between the fourth and fifth steps.

In addition, the front winch is moved to a third transverse rail above the third piers between the fourth and fifth steps, and the main truss is further advanced so that the center of the main truss is at the center of the second span. It may further comprise an adjustment step.

In addition, a retreat step of supporting the rear of the main truss and moving the second transverse rail on the second pier to the rear side by using the rear legs mounted to the rear of the main truss between the adjusting step and the fifth step. It may include.

Through the present invention, by using the intermediate transverse rail installed between the count weight and the piers installed in the rear of the main truss, the size of the girder launching system is reduced, the time for assembling, operating and dismantling the equipment is reduced, and the piers This reduces the load on the construction, reducing construction time and cost, and increasing construction stability.

In addition, while the main truss continues to move forward, the girder is lifted and mounted under the side of the pier, thereby greatly reducing the construction period and construction cost of the girder.

1 is a side view illustrating a shot girder launching system using a count weight and an intermediate transverse rail according to an example of the present invention.
2A and 2B are side and enlarged views illustrating the chain and the wheel of the short girder launching system using the count weight and the intermediate transverse rail according to an example of the present invention.
Figure 2c to 2e is a side view, plan view, front view showing the tension of the main truss and the holding system for fixing the main truss of the circumferential wire of the short girder launch system using the count weight and the intermediate transverse rail in accordance with an example of the present invention And a partial enlarged view.
2F to 2H are side, front and plan views showing a fixing system for fixing the front winch or the rear winch of the short girder launching system using the countweight and the intermediate transverse rail according to an example of the present invention to the roller assembly.
3 is a step-by-step diagram illustrating a girder construction method using a short girder launching system using a count weight and an intermediate transverse rail according to an example of the present invention.
4 is a diagram of the prior art.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the elements of each drawing, the same elements are designated by the same reference numerals as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present invention, when it is determined that a detailed description of a related well-known configuration or function disturbs the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but there is another component between each component. May be “connected”, “coupled” or “connected”.

Hereinafter, a short girder launching system using a count weight and an intermediate transverse rail and a girder construction method using the same will be described in detail with reference to FIGS. 1 to 3.

Referring to FIG. 1, a short girder launching system using a count weight and an intermediate transverse rail according to an example of the present invention includes: tower supports 10 coupled to upper sides of bridges 1; Transverse rails 20 are coupled to the upper side of the tower support 10 installed in the transverse direction; Main trusses 30 which are installed in the longitudinal direction on the upper side of the transverse rails including a pair of left and right trusses; Installed between the transverse rail 20 and the main truss 30 includes a roller that is movable on the transverse rail 20 in the transverse direction and at the same time the main truss 30 is movable in the longitudinal direction. Roller assemblies 40; And a front winch 50 installed at a front side and a rear winch 52 installed at a rear side between the pair of trusses of the main truss 30 so as to be movable in the longitudinal direction. Hereinafter, the front refers to the direction in which the main truss 30 advances to mount the girder, and the rear refers to the opposite direction.

This embodiment may include tower supports 10 installed between the positions where girders are to be installed above the pier 1 (including shifts). That is, the tower supports 10 may be installed between the girders. The tower support 10 in the drawing is formed in a truss shape, but is not limited thereto. That is, the tower support 10 may also have other shapes such as pillars that can safely and firmly support the transverse rails 20.

The transverse rails 20 may be installed above the tower supports 10. That is, the transverse rails 20 may be coupled to the upper side of the tower supports 10 coupled to the upper side of the pier 1 in the transverse direction. The height of the horizontal rail 20, that is, the height of the tower support 10 is preferably higher than the upper side of the girder to be installed.

The main truss 30 may be installed on the lateral rail 20 to move the girder while moving in the longitudinal direction and the lateral direction.

Roller assemblies 40 may be installed between the horizontal rail 20 and the main truss 30. Exactly, it is installed between the horizontal rail 20 and each of a pair of left and right trusses. The roller assemblies 40 comprise a plurality of rollers. That is, the rollers are installed at the lower side to move in the lateral direction on the horizontal rail 20, and the rollers are installed at the upper side to allow the main truss 30 to move in the longitudinal direction. Therefore, the rollers installed on the lower side of the shaft is in the longitudinal direction, the rollers installed on the upper side may be formed in the transverse direction. In addition, the roller assembly 40 may be configured to be rotatable by connecting the lower portion and the upper portion with a pin. That is, when the main truss 30 approaches the roller assembly 40, the upper side of the roller assembly 40 may be properly rotated, so that the main truss 30 may easily rise to the upper side of the roller assembly 40.

The roller assembly 40 allows the main truss 30 to move in the longitudinal and transverse directions on the transverse rail 20. That is, after lifting the girder with the front winch 50 and the rear winch 52, which will be described later, the main truss 30 slides on the upper side of the roller assembly 40 to move in the longitudinal direction, and the roller assembly 40 is laterally lateral. The girder may be mounted at a desired position by moving laterally on the rail 20. After lifting the girder with the front winch 50 and the rear winch 52, the main truss 30 may move in the longitudinal direction after first moving in the longitudinal direction on the main truss 30. This can be appropriately selected in consideration of the center truss 30, the front winch 50 and the rear winch 52 and the center of gravity including the weight of the girders, and the position to install the girders mounted thereon.

The main truss 30 may be installed long in the vertical direction on the upper sides of the transverse rails 20. In addition, the main truss 30 may include a pair of left and right trusses and a connecting truss connecting the left and right pair of trusses. The connecting truss may be an H beam instead of a truss. The length of the main truss 30 may be shorter than two spans and longer than one span of the bridge. That is, the weight of the main truss 30 can be reduced by forming shorter than the length of the main truss, which is at least two spans used in a general girder launching system. Therefore, the present embodiment can be safely operated because the weight of the girder launching system is light, and by shortening the assembly and disassembly time of the equipment, it can greatly improve the economics.

The weight of the weight 32 is installed in the rear of the main truss 30, the intermediate transverse rail 34 may be installed in the middle of the first span 80 is completed. That is, it may be installed after lifting by rotating the intermediate transverse rail 34, the roller assembly 40 is installed on the upper side of the girder, the installation is completed in the first span 80.

The count weight 32 and the intermediate transverse rail 34 fall when the main truss 30, which is shorter than two spans of bridges and longer than one span, advances to the second span 82, which is the next span in front of the girder. Can be prevented. That is, when the main truss 30 shorter than the two spans of the bridge advances to the second span 82 which is the next span, one transverse rail 20 between the first span 80 and the second span 82 is provided. At the point where it is positioned on), the roller assembly 40 on the intermediate transverse rail 34 supports the main truss 30, and at the same time the countweight 32 applies a load to the rear so that it can move forward without falling. do.

Installation of the intermediate transverse rail 34 may be installed on the upper side of the girder by lifting the lower side of the main truss 30 before moving forward to the second span 82, which is the next span, and then rotating in the transverse direction.

That is, by providing the intermediate transverse rail 34, the supporting point for supporting the main truss 30 is the first transverse rail 22 above the first pier 3 and the second transverse rail above the second pier 5. At 24, the intermediate transverse rail 34 is added, and as the main truss 30 moves forward, the support point is changed to only the intermediate transverse rail 34 and the second transverse rail 24, and then further advanced. The second transverse rail 24 and the third pier 7 are turned into a third transverse rail 26.

Therefore, by the action of the count weight 32 and the intermediate transverse rail 34, even if the main truss 30 is shorter than two spans, the main truss 30 can move forward without falling.

A front winch 50 and a rear winch 52 may be installed between the pair of trusses of the main truss 30. The front winch 50 may be installed at the front of the main truss 30, and the rear winch 52 may be installed at the rear of the main truss 30. The front winch 50 and the rear winch 52 are movable in the longitudinal direction on the main truss (30). After the front winch 50 and the rear winch 52 may lift the girder, the front winch 50 may move in the longitudinal direction on the main truss 30 to lower the position of the girder.

2A and 2B, chains 60 may be installed on each of a pair of left and right trusses of the main truss 30. Both ends of the chains 60 may be fixed in front and rear of the pair of trusses, respectively, and may be installed in the longitudinal direction. In addition, chain wheels 62 may be installed at the front winch 50 and the rear winch 52.

The chains 60 are installed by zigzag winding the chain wheels 62 up and down, and the front winch 50 and the rear winch 52 do not slide along the main truss 30 as the chain wheels 62 rotate. Can move in the longitudinal direction.

The moving power of the front winch 50 and the rear winch 52 is through the chain wheel 62 provided on both sides of the front winch 50 and the rear winch 52 and the chain 60 provided in the pair of trusses. Can be delivered. That is, the chains 60 are installed in each of the left and right pair of trusses in the longitudinal direction, and both ends of the chains 60 may be fixed to the front and rear of the pair of trusses, respectively. In addition, a plurality of chain wheels 62 provided in the longitudinal direction on both sides of the front winch 50 and the rear winch 52 may be installed side by side in the longitudinal direction, or may be installed in a zigzag shape in the vertical direction. In any case, the chains 60 may be installed by winding the chain wheels 62 in a vertical direction.

When power is supplied, the drive chain wheel 62 of the chain wheels 62 rotates, thereby causing the chain 60 wound around the chain wheels 62 to be tensioned forward or rearward, and thus with the front winch 50. The rear winch 52 may move forward or backward on the main truss 30. Sliding is prevented by the chain 60 wound around the chain wheels 62 in a zigzag shape, so that the front winch 50 and the rear winch 52 can safely proceed in the longitudinal direction without slipping on the main truss 30. It is possible to safely transport the girder by moving the main winch 50 and the rear winch 52 on the main truss 30 without slipping even when the main truss 30 is inclined by the height difference of the pier 1.

2C to 2E, the main truss 30 of the short girder launching system according to an exemplary embodiment of the present invention may include a round wire 94 that tensions the entire main truss 30. That is, the lower rollers 90 are respectively installed at the front and rear lower sides of each of the left and right pair of trusses, and the upper rollers 92 are respectively installed at the front and rear upper sides of the pair of trusses, respectively, It is possible to install a one-round wire 94, which is wound around the rollers 90 and the upper rollers 92.

Specifically, the rotary shafts of the lower rollers 90 are installed in the transverse direction, and the rotary shafts of the upper rollers 92 are installed in the longitudinal direction, and the peripheral wire 94 is the front lower roller 90 of the one truss and the front upper part. Roller 92, the front upper roller 92 of the other truss, the front lower roller 90, the rear lower roller 90, the rear upper roller 92, the rear upper roller 92 of the one truss, the rear lower roller (90), the front lower roller (90) in turn in order to be able to take a round after the tension can be connected. That is, the one-round wire 94 is a U-shaped concave in the center when viewed from the side, is installed in an n-shaped convex in the center when viewed from the front and by tensioning the rollers up, down, left, right, up and down in a state not fixed at any point The structural rigidity of the main truss 30 can be greatly increased. Although the length of the main truss 30 is reduced in this embodiment, the main truss 30 of the short girder launching system itself is a large and heavy equipment, and after lifting the girder of the weight, Since it moves on the roller assembly 40 mounted on it, it may be exposed to strong winds and the like, and thus has structural instability. .

In addition, the short girder launching system according to an example of the present invention may include a holding system 100 for fixing the main truss 30 to the roller assembly 40 or the transverse rail 20. In the present embodiment, the fixing to the roller assembly 40 will be described.

The holding system 100 may include a holding flange 102 coupled to a point of the one-way wire 94 positioned between the front lower roller 90 and the rear lower roller 90. A through hole may be formed in the holding flange 102, and a holding pin 104 may be inserted into the through hole. In addition, a through hole corresponding to the through hole formed in the holding flange 102 may be formed in the roller assembly 40. That is, by matching the through hole formed in the holding flange 102 coupled to one point of the one-way wire 94 with the through hole formed in the roller assembly 40, the holding pin 104 is inserted and coupled to the main truss ( 30) can be fixed. That is, by holding the main system truss 30 to the roller assembly 40 by the holding system 100 it is possible to transport the girder through the front winch 50 and the rear winch 52 in a stable state. In the case of simply fixing one point of the truss to the roller assembly 40 without the holding system 100 coupled to the one-round wire 94, it is difficult to maintain a stable fixed state due to the characteristics of the main truss 30 having a long length and a heavy weight. This embodiment can be said to be a solution.

2F to 2H, the short girder launching system according to an exemplary embodiment of the present invention may further include a fixing system 110 for fixing the front winch 50 and the rear winch 52 to the roller assembly 40. have. The fixing system 110 is installed on the front, rear and left and right sides of the front winch 50 and the rear winch 52, respectively, and the inclined rollers 112 are installed to be inclined so as to converge to the virtual one axis of the lower side. Winding the inclined rollers 112, the front wire 114 toward the one axis of the lower side, the rear wires of the inclined rollers 112 and the rear wire 116 toward the one axis of the lower side, the front wire ( It may include a fixing pin 118 for fixing the 114 and the rear wire 116.

The fixing of the front wire 114 and the rear wire 116 may be coupled to the roller assembly 40 with the fixing pins 118 using the holes of the ring after forming the rings therein. In addition, the V-shaped angle connecting the ends of the front wire 114 and the rear wire 116 is coupled to form a hole in the center of the angle, and then using the hole fixed to the roller assembly 40 ( 118).

In addition, the front wire 114 and the rear wire 116 may be installed only on the outside of the main truss 30, only on the inside of the main truss 30, or may be installed on both the inside and the outside. In other words, it may be installed outside the main truss 30, that is, outside the left and right pair of trusses, or installed inside the main truss 30, that is, inside the left and right pair of trusses, or both. When the front wire 114 and the rear wire 116 are installed on both the outside and the inside of the main truss 30, the front winch 50 or the rear winch 52 can be more stably fixed. Fixing system 110 using the inclined rollers 112, the front wire 114 and the rear wire 116 is a very stable fixation by tensioning the front winch 50 or the rear winch 52 as a whole, not one point State can be maintained.

The fixing system 110 may be used when self-propelling the main truss 30 in the longitudinal direction. That is, after fixing the front winch 50 or the rear winch 52 to the roller assembly 40, the main truss 30 is rotated by rotating the chain wheel 62 of the front winch 50 or the rear winch 52 by power. Self-propelled to move forward and backward. Therefore, after fixing the front winch 50 or the rear winch 52 by using the fixing system 110, the main truss 30 can be moved to a desired point. This allows the main truss 30 to move without slipping even when the longitudinal slope is large.

Hereinafter, a girder construction method using a short girder launching system using a count weight and an intermediate transverse rail according to an example of the present invention will be described in detail. In the present embodiment, descriptions of the same elements as in the above-described embodiment may be omitted. Omitted parts may infer the description of the above-described embodiment.

The main truss of this embodiment is shorter than two spans of bridges, longer than one span, and a weight count of weight is installed at the rear.

The girder construction method using the short girder launching system using the count weight and the intermediate transverse rail of the present embodiment is located in front of the first pier 3 and the first pier 3, which are one of the pier 1. After the girders are installed in the first span 80 formed by the second piers 5, the front winch 50 is moved to the second transverse rail 24 above the second piers 5 to fix the girders. Step 1 to make; The rear winch 52 is moved to the middle of the first span 80 to lift the intermediate transverse rail 34 on which the roller assembly 40 is installed, and then rotate the rear winch 52 to install the girders installed in the first span 80. Step 2 installed on the upper side; Moving the rear winch (52) toward the countweight (32) behind; Advancing the main truss (30) to a second span (82) formed by the third piers (7) located in front of the second piers (5) and the second piers (5); Girders are lifted using the front winch 50 and the rear winch 52 of the main truss 30 and installed in the second span 82 formed by the second piers 5 and the third piers 7. Step 5 can be performed in order.

3A and 3B, in the first step, the first pier 3, which is one of the bridges 1 to which the girder is to be installed, and the second pier 5 located in front of the first pier 3 are After the girders are installed in the first span 80 to be formed, the front winch 50 is moved to the second transverse rail 24 installed on the upper side of the second piers 5 to fix the girders. The front winch 50 may be fixed to the second horizontal rail 24 or to the roller assembly 40 installed on the second horizontal rail 24. Referring to FIG. 3B, the wires are extended downward in a V shape at the front and the rear of the front winch 50 to be fixed to the roller assembly 40.

That is, in the first step, after completing the installation of the girder in the first span 80 using the short girder launching system, the second transverse rail to move the main truss 30 to the second span 82, which is the next span. The front winch 50 is fixed to the roller assembly 40 installed on the 24 or the second transverse rail 24 to prepare for self-propulsion of the shot girder launching system.

Referring to FIG. 3B, in the second step, the rear winch 52 is moved to the middle of the first span 80, and the middle winch rail 34 is lifted from the bottom to the girder through the rear winch 52. It is a step of installing in the upper side of the girders installed in the first span 80 by rotating in the lateral direction.

That is, the second stage is an intermediate transverse rail 34 which is an additional support point to prevent the rear part from falling downward when the main truss 30 moves outward from the first pier 3 when the main truss 30 moves forward. ) Step.

Referring to FIG. 3C, the third step is to move the rear winch 52 closer to the count weight 32 behind the main truss 30. That is, the third step is to move the rear winch 52 to the rear, by adding a load to the rear of the main truss 30 together with the count weight 32 when the main truss 30 shorter than two spans advance, The truss 30 can be prevented from falling forward.

Referring to FIG. 3D, the fourth step includes the main truss 30 as the second span 82 formed by the third piers 7 located in front of the second piers 5 and the second piers 5. It is a step forward.

That is, the fourth step is to advance the main truss 30 to the second span 82, which is the next span to install the girder, through self-propulsion of the short girder launching system. In step 4, the main truss 30 is moved forward by fixing the front winch 50 to the roller assembly 40 installed on the horizontal rail 20 or the horizontal rail 20 and then rotating the chain wheel 62 by using power. can do. That is, when the front wheel 50 is rotated after the front winch 50 is fixed to the horizontal rail 20 or the roller assembly 40, the front winch 50 is fixed and the main truss 30 in the longitudinal direction. I can move it. In this case, even if there is a longitudinal inclination caused by the height difference of the piers 1, the main truss 30 can move forward well without slipping.

Hereinafter, the remaining steps will be described with reference to FIGS. 3E to 3F.

The present embodiment may further include a fixing step of fixing the main truss to the second transverse rail on the upper side of the second pier between the fourth and fifth steps.

That is, in the fixing step, the main truss 30 advanced to the second span 82 is fixed to the second transverse rail 24, so that the overall stability of the shot girder launching system is secured to the second span 82. It is the stage to prepare the lifting construction of the girder. The rear of the main truss 30 is fixed to the roller assembly 40 on the upper side of the second transverse rail 24 or the second transverse rail 24 and, if necessary, the front of the main truss 30 is the third pier 7. It can be fixed to the roller assembly 40 on the upper side of the third transverse rail 26 or the third transverse rail 26 provided above.

In the fifth step, the girders are installed in the second span 82 formed by the second piers 5 and the third piers 7 by lifting the girders from the bottom using the front winch 50 and the rear winch 52. It's a step. That is, after lifting the girder by using the front winch 50 and the rear winch 52, the main truss 30 can be moved laterally to mount the girder at a desired position.

As described above, by repeatedly performing the above-described steps, the girder can be installed safely, quickly and simply up to the construction range planned by the short girder launching system.

The girder of this embodiment is lifted from the lower side of the pier (1) side to be mounted. That is, the main truss 30 is continuously advanced, the girder is supplied to the side lower side of the pier 1 and then lifted and mounted. This allows the girders to be mounted quickly.

Between the steps 4 and 5, the front winch 50 is moved and fixed to the third transverse rail 26 above the third piers 7, and the center of the main truss 30 is positioned at the second span 82. It may further include an adjustment step of further advancing the main truss 30 to come to the center.

In the adjusting step, the centers of the main truss 30 and the second span 82 coincide with each other, thereby enabling the tensioning operation of the girder in a stable state. The adjusting step may proceed either before or after the fixing step described above.

Between the adjusting step and step 5, the rear leg 36 mounted on the rear of the main truss 30 is used to support the rear of the main truss 30 and the second transverse rail above the second piers 5. And a retraction step of moving the back 24.

In the retraction step, the second lateral rail 24 may be moved rearward to secure a space for easily installing the girder. That is, while the main truss 30 advances to the second span 82, both the transverse rails 20 on the upper side of the second piers 5 and the third piers 7 are located in front of the piers 1. In this case, when the girder is lifted and mounted on the piers 1, the lateral rail 20 may interfere with the installation of the girder. Therefore, the girder can be lifted and easily mounted on the piers 1 by moving the second horizontal rail 24 to the rear.

That is, in the retreat step, the rear leg 36 mounted on the rear of the main truss 30 is operated to lift and support the rear of the main truss 30 slightly, and then the rear side rail 20 of the main truss 30 is supported. ) Can be easily installed by moving the back to the center of the pier 1.

In the foregoing description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. That is, within the scope of the present invention, all of the components may be configured or operated by selectively combining one or more of them. In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be inherent unless specifically stated otherwise, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms used generally, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: piers
3: first piers
5: second piers
7: pier
10: Tower Support
20: Cross rail
22: first cross rail
24: 2nd cross rail
26: 3rd side rail
30: main truss
32: countweight
34: Intermediate transverse rail
36: rear leg
40: roller assembly
50: front winch
52: rear winch
60: chain
62: chain wheel
80: first span
82: second span
90: lower roller
92: upper roller
94: round wire
100: holding system
102: holding flange
104: holding pin
110: fixed system
112: inclined roller
114: front wire
116: rear wire
118: push pin

Claims (3)

Tower supports coupled to the pier's upper sides of the bridge;
Transverse rails are installed in the transverse direction coupled to the upper side of the tower supports;
Main trusses which are installed in the longitudinal direction on the upper side of the transverse rails including a pair of left and right trusses;
Roller assemblies installed between the transverse rail and the main truss, the roller assemblies including rollers which are movable in the transverse direction on the transverse rail and move in the longitudinal direction; And
Short girder launch system using a count weight and the intermediate transverse rail, including; the front winch is installed between the pair of truss of the main truss and movable in the longitudinal direction and the rear winch is installed in the rear.
The method according to claim 1,
The main truss is shorter than two spans and longer than one span of the bridge, and a weight count of weight is installed at the rear of the bridge, and an intermediate transverse rail having a roller assembly installed in the middle of the first span where the girders are installed is completed. It is additionally installed in the transverse direction on the upper side, and is supported by the roller assembly on the intermediate transverse rail and is loaded backward by the count weight when the main truss advances to the second span, which is the next span in front of the girders. Short girder launching system using the count weight and the intermediate transverse rail, characterized in that it can move forward without falling.
The method according to claim 1,
The mid girder rail is a short girder launching system using a count weight and a mid lateral rail, characterized in that the main truss is lifted from the lower side and installed after the main truss advances to the second span.

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