KR20030086222A - temporaty bridge using prestressed compuond double girder and method for building the temporary bridge - Google Patents

Abstract

PURPOSE: An installation method for a temporary bridge is provided to promote utility by increasing the stress and section of a composite beam, to manufacture a composite beam used for a bridge in a short term, to maximize economical efficiency and constructability, to reduce the stress of a temporary bent and negative reaction force, and to cut down construction expenses by manufacturing simply. CONSTITUTION: The installation method for a temporary bridge(10) comprises the steps of: manufacturing a prestressed composite built-up beam(30) by placing built-up beams connected with upper and lower flanges of upper and lower H-beams(21) vertically on a workbench, then prestressing using a hydraulic jack; installing a backing(40) on a temporary bent(11) of a temporary bridge(10) to install the prestressed composite built-up beam(30); installing the prestressed composite built-up beam(30) on the temporary bent(11), installing a built-up beam(30) on both sides of the temporary bridge(10), installing a prestressed composite built-up beam(30) on the central temporary bent; and installing an upper H-beam(21) between the built-up beam(20) and the prestressed composite built-up beam(30), then connecting on a gusset plate installed on a web of each H-beam by a bolt.

Description

Temporary bridge using prestressed compuond double girder and method for building the temporary bridge}

The present invention relates to a prestressed composite double beam manufactured by introducing prestress into a double beam connecting upper and lower flanges of upper and lower H beams having different stiffness up and down, and a temporary bridge installed by assembling it with a supporting device installed on the upper side of the temporary vent. After mounting the upper and lower flanges of upper and lower H beams with different stiffness up and down to each other on the workbench, the prestressed composite double beam with prestress is manufactured by using hydraulic jack, and the temporary bridge of temporary bridge A support device is installed to install the prestressed composite beams on the pre-stressed composite beams, and the prestressed composite double beams are installed on the temporary vents. In the central temporary vent mentioned above prestress Rimmed, install information prestressed composite ply, the present invention relates to the gyeopbo and prestressed composite between gyeopbo method hypothesis bridge installation to installation by connecting a bolt on the connection plate is installed on the abdomen of each of the H-beam after installing the upper H-beam.

The installation of temporary bridges in the above-described method relates to temporary bridges temporarily installed for traffic of vehicles and people in order to install permanent bridges. The prestress is applied to H beams while increasing the rigidity of H beams in a relatively easy way. If it is introduced and installed on the bridge, the effect of offsetting the stress caused by the load acting on the bridge in the future and the canceling stress can be obtained, and it is easy to manufacture and install, and is supported by the supporting device installed on the temporary vent. By allowing the expansion and contraction of the furnace, it provides an economical and safe installation method of the temporary bridge which can reduce the stress of the bottom of the temporary vent and the reaction force acting on both points of the temporary bridge.

Currently, the installation method of bridge construction is to connect the beams to each other to establish a temporary vent, and to weld the temporary vent integrally thereon to install a temporary bridge, and then install a double-plate or steel plate on it to temporarily allow the vehicle or person to pass. There are existing conventional methods to install, a method of introducing prestress using a high strength steel bar, and a method of constructing a continuous assembly of trusses. The conventional method has a problem that temporary bridges are reduced to 5.0 ~ 8.0m because of the shortage of temporary bridges, and the temporary bridges are lost during flooding.The method using high strength steel rods has a ramen type negative effect and prestress. It is hypothesized by the long span, but this method is able to cancel the stress, but the rigidity of the upper beam cannot be increased due to the introduction of prestress by non-attached steel rods, so it cannot effectively cope with the deflection and vibration of the temporary bridge. In other words, long periods are possible in terms of stress, but because the upper beam is less rigid, a lot of deflection occurs, so that the actual use is restricted. In addition, the method of constructing the truss as a continuous assembly is long and long, but it is a problem for the smooth supply and demand because the material must be imported and installed from foreign countries. The problem has been raised due to poor use.

The present invention proposed in order to solve the above problems is to install a composite double beam in which the prestress is introduced to the H beam connected to the double beam up and down on the temporary bridge, the practicality that can effectively cope with the increase of the rigidity of the beam, deflection and vibration, etc. In addition to developing the installation method of the bridges using prestressed composite beams, it is also possible to develop and use the supporting device to reduce the lower stress and the reaction force of the temporary vents by enabling the thermal contraction and expansion in the longitudinal direction of the bridges. Therefore, it is possible to easily manufacture and use in the field at a lower cost than the products currently used to provide an economical and practical installation method of the temporary bridge.

1 is a view showing a temporary bridge installed by using the prestressed composite beam of the present invention.

Figure 2 (a) (b) (c) (d) is a view showing the procedure for producing a prestressed composite double beam of the present invention.

Figure 3 is a view showing a work table installed in order to introduce a prestress to the double beam of the present invention.

4 is a plan view showing that the double beam is installed on the workbench of FIG.

5 is a view showing a connecting portion for connecting the double beams, the upper H beam, the prestressed composite double beams for installation of the temporary bridge of the present invention.

Figure 6 is a detailed view showing the support device of the present invention.

7 is a view showing the movable end support device installed at both points to install the support device of Figure 6 assembled to the temporary vent.

FIG. 8 is a view illustrating the installation of a fixed end support device in the central temporary vent while installing the temporary support unit of FIG.

<Description of Symbols for Main Parts of Drawings>

P ... prestressed load

10 ... Temporary bridge 11 ... Temporary vent

12 ... double vent

20 ... Plumbing 21 ... Upper H Beam

22 ... lower H-beam 23 ... upper flange

24 ... Lower flange 25 ... Extension

26. Bolt nut joint

30 ... Prestressed Composite Double Beam

40 ... Support 41 ... Support Frame

42 ... holes 43 ... upper plate

44.Lower plate 45 ... Reinforced elastic rubber plate

46 ... reinforcement plate 47 ... round bar

48 ... Longsmith 49-1 ... Nuts

49-2 ... Bolt

50 ... connection 51 ... connection plate

60 ... workbench 61 ... reaction support

62 ... Hydraulic jack 63 ... Horizontal beam

64 ... Stringer 65 ... Transverse Buckling

66 ... Space

The present invention is to install the pre-stressed composite double beam produced by introducing the pre-stress to the double beam and the double beam of the upper and lower H-beams and the upper and lower flanges of the upper and lower H beams, each of which is welded or temporarily bolted up and down, respectively, It is related to a temporary bridge installed by assembling the supporting device, and the double beams 20 connecting the upper and lower flanges 23 and 24 of the upper and lower H beams 21 and 22 with different stiffness up and down are mounted on the work table 60. After mounting, a prestressed composite double beam 30 into which prestresses are introduced using a hydraulic jack 62 is produced, and a base for installing the prestressed composite double beam 30 in a temporary vent 11 of a temporary bridge 10 is provided. The device 40 is installed, and the prestressed composite beam 30 is installed in the temporary vent 11, but the double beam without prestress is introduced into the end temporary vent which is a point on both sides of the temporary bridge 10. 20) and the pre-stressed composite double beam 30 into which the above prestress is introduced is installed in the central central temporary vent 11, and the upper H beam (between the double beam 20 and the prestressed composite double beam 30) is installed. After the installation 21, the temporary bridge 10 is connected to the connecting plate 51 provided on the abdomen of each H beam by means of a bolt 49-2.

The upper H beam 21 is SM400, and the allowable stress fa is 1400 kgf / cm 2, and the lower H beam 22 is SM490, and the allowable stress fa is 1900 kgf / cm 2.

Hereinafter, described in detail by the accompanying drawings the configuration and operation of the present invention.

1 is a view showing a temporary bridge installed by using the prestressed composite beam of the present invention, the upper and lower flanges 23 and 24 of the upper and lower H beams 21 and 22 having different rigidities are connected to each other vertically ( 20) and the prestressed composite double beam 30 into which the prestress is introduced by using the hydraulic jack 62 to the double beam, and the upper H beam 21 installed on the upper side of the double beam 20. The support device 40 is installed on the temporary vent 11, and the end temporary vents at both ends of the temporary bridge 10 are installed with a double beam 20 in which prestress is not introduced. The pre-stressed composite double beam 30 into which the above prestress is introduced is installed in the central temporary vent, and the double beam 20 and the prestressed composite double beam 30, which are portions corresponding to the spaces of the temporary bridge 10, are installed. In between the upper H beam 21 After the installation, it is a temporary bridge 10 installed by connecting with a bolt 49-2 to the connecting plate 51 provided on the abdomen of each H beam.

Figure 2 (a) (b) (c) (d) is a view showing a procedure for manufacturing a prestressed composite double beam of the present invention, Figure 2 (a) is a top H beam of a rolled steel for general structure (mild steel, SM400) The lower flange 24 of 21 and the upper flange 23 of the lower H beam 22 which are high-strength rolled steels (high steel SM490) are temporarily vortexed or welded up and down, and the double beam 20 is formed. At this time, both ends of the lower H-beam 22 are formed to extend the extension portion 25 to a predetermined length. The extension part 25 thus formed is the upper H beam when the double beam 20 and the prestressed composite beam 30 and the upper H beam 21 installed in each temporary vent 11 in FIG. 1 are connected to each other between the trunks. This is for placing the nut 21 on the extension part 25 and using the connection plate 51 to each other.

Figure 2 (b) is mounted on the work table 60 of Figure 3 to be described later to the double beam 20 produced in Figure 2 (a) the double beam 20 and the center at both ends of the upper H beam 21 The prestress is loaded to the double beam 20 by loading the prestress load P by using hydraulic jacks at both sides at a distance of 1 / 4L. In this case, a compressive force is generated on the upper flange 23 of the upper H beam 21, and a tensile force is generated on the lower flange 24 of the lower H beam 22, respectively.

FIG. 2 (c) shows the lower flange 24 of the upper H beam 21 and the upper flange 23 of the lower H beam 22 while loading the prestress load P in order to introduce prestress into the double beam 20. It is to produce a fully integrated prestressed composite double beam (30) by using a bolt nut joint 26 or a full weld using the bolt nut or the temporary welding to the upper and lower parts.

2 (d) is to remove the prestressed load P loaded.

The principle that the prestress is introduced to the double beam 20 is because the double beam 20 temporarily connected two H beams up and down is loaded with the same prestress load P because the rigidity is much smaller than that of the composite beam that is completely integrally connected. When the beam P is removed after the two beams are completely integrated, a stress difference occurs. By this difference, the prestress is introduced into the double beam to produce the prestressed composite double beam. Of course, the prestressed pressure should not exceed the allowable stress of steel.

The prestressed composite plywood produced in this way can be effectively coped with sag and vibration by simply introducing the prestress and increasing the cross section at the same time without the difficulty of production or the hassle of maintenance because the production is completed through the above four steps.

3 and 4 is a view showing a work table 60 installed to introduce a prestress to the double beam 20 of the present invention, the work table is five on the two horizontal beams 63 installed on the ground at 1/4 l intervals The stringer 64 is installed to bolt the nut 26, and the overlap beam 20 is installed thereon so that the upper H beams 21 face each other, and the hydraulic jack 62 is installed therebetween. In addition, the two support beams (64) installed on both side ends of the work table 60 is installed in the vertical beam 64 and the bolt nut joint 26 in close contact with the double beam 20, respectively. The reaction force support 61 and the double beam 20 is installed in close contact with each other to serve as a point when the prestress load P is loaded by the hydraulic jack 62. A reaction force support 61 is provided on the three central stringers 64 having a high probability of buckling, and when the prestress load P is introduced by the hydraulic jack 62, the lateral buckling may occur in the double beams 20. The transverse buckling prevention member 65 is installed to prevent the reaction support 61 and the bolt nut joint 26 to be installed on the upper portion of the reaction support 61, the center three reaction force support 61 and The space 66 is provided at regular intervals between the double beams 20. In this way, the space 66 is arranged by the hydraulic jacks 62 installed at 1/4 l distances of both ends of the double beams 20, respectively, when the prestress load P acts, the double beams 20 are bent to both sides, and the prestresses are overlapped. It is to form a space portion to be introduced into. The reaction force supports installed on the three central beams are merely serving as a support band for installing the guide and the lateral buckling prevention member, and are distinguished from the point roles of the reaction force supports provided at both ends.

The distance of the said space part is 15-30 cm, but the preferable distance is 20 cm.

In addition, since the length of the composite beam used varies depending on the length of the bridge, the bolts are drilled in advance in the vertical beam so that they can be mounted on the workbench according to the length of various composite beams. .

FIG. 5 is a view illustrating a connecting portion 50 connecting the overlap beam 20, the upper H beam 21, and the prestressed composite beam 30 to each other to install the temporary bridge of the present invention, as described in FIG. At the end temporary vent 11, which is a point on both sides of the temporary bridge 10, a double beam 20 without prestress is installed, and the prestressed composite beam 30 is installed at a central temporary vent 11, which is a central point. However, between the double beam 20 and the prestressed composite beam 30, which are portions corresponding to the points of the temporary bridge 10, the upper H beam 21 on the extension portion 25 of the double beam and prestress composite beam It is a temporary bridge 10 in which a bridge is installed by placing a bolt nut joint 26 on a connecting plate 51 provided on both sides of the H beams on both sides.

Figure 6 is a detailed view showing the support device 40 of the present invention, the upper plate 43, the plurality of round bar 47, the reinforcing plate 46, reinforcing elastic rubber plate 45 is installed on both sides of the long hole 48 ) And the lower plate 44 having the support frame 41 formed at the center and the holes 42 at both sides thereof are integrally installed with the bolt nut using the long hole 48 and the hole 42.

The upper part of the upper plate 43 is installed under the lower flange 24 of the lower H beam 22 of the double beam 20 or the prestressed composite beam 30 and the lower bar 47 at the lower part of the upper plate 43. The reinforcing plate 46 and the reinforcing elastic rubber plate 45 are installed in the supporting frame 41 of the lower plate 44 to protect the members, to transfer the load of the upper part to the lower side, and to keep the horizontal gradient. Play a role. The long holes 48 installed on both sides of the upper plate 43 are installed on the temporary vent 11 using holes 42 and bolt nuts formed on both sides of the lower plate 44.

The round bar 47 serves to remove the restraining force while the round bar 47 itself moves the horizontal force generated by the temperature.

The reinforcement plate 46 protects the reinforcement elastic rubber plate 45 installed at the lower part of the reinforcement plate and at the same time, supports the round bar 16 evenly to serve to smoothly transfer the supporting force to the lower part.

The reinforcing elastic rubber plate 45 is installed in the support frame 41 of the lower plate to install to alleviate the impact caused by the upper load, and to reduce the restraint on rotation.

Holes 42 are formed at both sides of the lower plate 44, and a support frame 41 in which the reinforcing elastic rubber plate 45 is installed is formed at the center of the lower plate 44, and the lower part of the lower plate 44 is formed of a temporary vent 11. It will be installed at the top.

FIG. 7 is a view illustrating a movable end support device installed in both ends of the temporary vent 11 by assembling the support device 40 of FIG. 6, and assembling the support device 40 of FIG. 6. The end of the two points, which is installed on the temporary vent 11, is provided with a round bar 47 in the supporting device so that the beam of the bridge can absorb the expansion and contraction due to temperature.

FIG. 8 is a view showing that the support device 40 of FIG. 6 is assembled to the temporary vent 11, but the fixed end support device is installed in the central temporary vent 11. The support device 40 installed on the above) is to install the support device 40 without installing the round bar 47 so that the bridge beam does not move by stretching and contracting due to temperature or the like.

By installing the temporary bridges using prestressed composite double beams in which two H beams are connected up and down and using prestressed composite beams, it is possible to satisfy the usability through the stress increase and the cross-sectional increase of the composite beams. It can be manufactured and work on the ground to be mounted directly on the temporary vent, maximizing economic feasibility and constructability. And by developing the supporting device to reduce the horizontal force, it is possible to reduce the stress and the reaction force of the temporary vent of the temporary bridge, and the production is simple, the construction cost is cheap, the aesthetics are beautiful, and the load transfer mechanism is clear and safe. There is an advantage to building a bridge.

Claims (9)

The construction of the temporary bridge of the temporary bridge is carried out with a double beam connecting the upper and lower flanges of the upper H beam and the lower H beam having different stiffness up and down, and a prestress composite double beam in which the double beam is prestressed using a hydraulic jack on a work table. It is installed on the supporting device installed on the upper, H-beam up and down, characterized in that the installation of the temporary bridge by installing and connecting the upper H beam, the double beam, prestressed composite double beam according to the distribution of the stress acting on the temporary bridge Temporary bridge using prestressed composite double beams in which prestress is introduced to the double beams made by connecting them. The method of claim 1 The work table is installed on the two horizontal beams on the ground to install five stringers at intervals of 1/4 ℓ, bolt nut joints, and the above double beams are installed so that the upper H beams face each other, and install a hydraulic jack therebetween, The two beams installed at both ends of the workbench are mounted in close contact with the double beams, respectively, to be installed as stringers and bolt nut joints, and a reaction force support is installed on the three stringers having a high probability of buckling. The transverse buckling guard, which is installed to prevent the occurrence of transverse buckling which may occur in the double beam when the prestress load P is introduced, is installed on the upper side of the reaction force support and is installed with the reaction force support and the bolt nut joint. H-beam up and down, characterized in that the space portion with a constant gap formed between the and the double beam Connected to the bridge with the beam theory a prestressed composite ply introducing a prestress in the production gyeopbo. The method of claim 2, The constant distance of the space portion is 15 ~ 30cm, the double beam is bent to both sides when the prestress load P is applied by the hydraulic jacks installed at 1/4 l distance of both ends of the double beam to provide a space for the prestress can be introduced into the double beam A temporary bridge using prestressed composite double beams in which prestress is introduced into a double beam produced by connecting H beams up and down characterized in that it is intended to. The method of claim 1, The supporting device is formed such that a plurality of round bars, reinforcing plates, and reinforcing elastic rubber plates are assembled in the lower part of the upper plate installed on both sides, and inserted into the support frame formed at the center, and the lower plate having holes formed at both sides of the upper plate is provided. Movable end installed in the end temporary vents at both sides of the temporary bridge to cope with expansion and contraction by the temperature of the bridge structure by integrally coupling between the lower flange of the lower H beam and the temporary vent with bolt nuts in the holes of the long hole and the lower plate. Temporary bridge using prestressed composite double beams, which adopt prestress to double beams produced by connecting H beams up and down, characterized in that it is a supporting device. The method of claim 4, wherein The double beams are connected to the upper and lower H beams by removing the plurality of round rods installed between the upper plate and the reinforcing plate among the supporting devices, which is a fixed end supporting device installed at the central part temporary vent which is the central point of the temporary bridge. Temporary bridge using prestressed composite double beam with prestress. The method of claim 1, Synthetic double beam and prestress composite double beam and prestress composite double beams installed in temporary vents of temporary bridges and upper H beams are connected to each other between the bases by placing extension parts of a certain length on both sides of the double beam and prestress composite double beams. This is a temporary bridge using prestressed composite double beams in which pre-stress is introduced into the double beams made by connecting H beams up and down. The method of claim 1, According to the distribution of the stress acting on the temporary bridge, the installation positions of the upper H beam, the double beam, and the prestressed composite double beam are provided with the double beam without prestressing at the end temporary vents at both sides of the temporary bridge. The prestressed composite double beam is installed in the central part temporary vent, which is a central point, and the upper and lower H beams are installed by connecting an upper H beam between the double beam and the prestressed composite double beam at a portion corresponding to the interval of the temporary bridge. Temporary bridge using prestressed composite double beams in which prestress is introduced to double beams made by connecting H beams. In the method of installing the temporary bridge, a) installing a support for supporting the temporary vent in the ground for installing the temporary vent of the temporary bridge at both sides and the center of the temporary bridge; b) assembling and installing a temporary vent on the support; c) installing a movable end support device on end temporary vents on both sides of the temporary bridge, and a fixed end support device on a central temporary vent in the center of the temporary bridge; d) installing a double beam on the workbench to produce a prestressed composite double beam using a hydraulic jack; e) installing a double beam on the supporting devices installed on both sides of the temporary bridge, and installing a prestressed composite double beam on the supporting device in the center, and installing and connecting the upper H beam between the double beam and the prestressed composite double beam; f) A method of installing a temporary bridge using a prestressed composite double beam in which a prestress is introduced into a double beam manufactured by connecting H beams up and down, including a step of installing a perforated plate on the beam of the temporary bridge to allow passage. . The method of claim 8, In the step of preparing the prestressed composite double beam of step d), the double flange is fabricated by temporarily vortexing or welding the lower flange of the upper H beam and the upper flange of the lower H beam, Mounting the manufactured double beams on a workbench and installing a hydraulic jack for introducing a prestressed load P at a distance of 1/4 l position from both ends of the upper H beam to the center, While the pre-stressed load P is being loaded onto the installed hydraulic jack, the parts of the upper flange of the upper H beam and the upper flange of the lower H beam are temporarily bolted or welded using bolt nuts to completely integrate the bolt nuts. A method of installing a temporary bridge using a prestressed composite double beam in which a prestress is introduced into a double beam produced by connecting H beams up and down, wherein the prestressed composite double beam is manufactured by removing the loaded prestressed load P.