KR100946277B1 - A arch bridge and method for constructing it - Google Patents

Abstract

The present invention can reduce the height while reducing the length of the bridge by introducing the characteristics of the arch to the composite girder applied to the preflex, and by the tension member and the support rod is introduced and adjusted in the horizontal and vertical direction of the load capacity according to the additional load The present invention relates to an arch bridge and its construction method capable of reinforcing and adjusting, preventing sagging and buckling of an arch member, and reducing a cross section of the arch member.

Arch member, support block, cover block, bottom plate member, preflex, composite girder

Description

Arch Bridge and Construction Method {A ARCH BRIDGE AND METHOD FOR CONSTRUCTING IT}

1 is a side cross-sectional view showing an arch bridge of the present invention,

2 is a cross-sectional view taken along the line A-A in FIG.

3 is an exploded perspective view of a portion A-A in FIG. 1,

4A and 4D are cross-sectional views showing steel materials as one component of the present invention,

5a and 5b is a perspective view and a cross-sectional view showing an arch member which is one configuration of the present invention,

6A and 6B are side cross-sectional views and perspective views showing a support block and a cover block as one component of the present invention;

7A to 7G are flowcharts showing the construction method of the arch bridge of the present invention;

8 is a block diagram showing the arch bridge construction method of the present invention.

<Major drawing>

1 Substructure 10 Composite Bridge

100 Composite Girder 110 Steel

120 Concrete part 200 Floor plate member

210 Support Frame 310 Support Block

320 Cover Block 400 Arch

500 support rod

The present invention minimizes the height of the bridge by introducing the characteristics of the arch to the composite girder to which the preflex is applied, while minimizing the height of the bridge, and the horizontal and vertical prestresses are introduced and controlled by the tension member and the supporting rod, thereby enhancing the load capacity according to the additional load and The present invention relates to an arch bridge and a construction method thereof that can adjust, prevent sagging and buckling of an arch member, and reduce a cross section of the arch member.

In general, the preflex girder bridge is a vertical bridge, and there are steels inside the girder, so the height of the girder is low and the span between the piers is less than 50M. Such a preflex girder bridge is often used in crowded urban areas or rivers when there is no room for the geometry. However, compared to other girder bridges, the salary is lower, and the height of the girder itself is more than 1.0m, and the height of the girder increases to around 2.0m as it goes to the Jangji. Therefore, it is difficult to use when there is a need for long periods of time without flood space in urban areas where the flood space is high due to the high flood level and the installation of bridges is difficult.

Therefore, there is a case where arch bridge is selected as a bridge of low height, which requires such a long span, and the conventional arch bridge is divided into a vertical arch bridge and a lower arch bridge, and the vertical arch bridge has a bridge top plate on the upper arch. The furnace arch member mainly uses concrete, and sometimes circular steel. The arch bridge is a structure in which a bridge deck is placed under the arch, and most of the structure is made of steel. Since the arch structure is a structure in which all the arch members are governed by the compressive force, the cross section of the arch member becomes very large as the space increases.

In general, arch bridges can be applied up to about 200M, and in the case of arch bridges, the cross section of the arch member is large, so that there are longitudinal, transverse, and vertical reinforcements inside to prevent buckling against compression. As the construction cost of the bridge is increased, the bridge form around 50m, which is short, does not adopt the arch type as an economic problem. However, there may be exceptional cases in which the aesthetics are important or inevitable due to on-site conditions. Problems caused by the installation of various reinforcement materials include not only economic efficiency, but also difficulties in design and construction, and internal inspection of arch members, which causes many problems in terms of future maintenance.

Therefore, the present invention has been made to solve the problems caused by the prior art, it is possible to introduce the characteristics of the arch bridge not only to make the bridge longer, but also to reduce the height by adding the characteristics of the preflex girder bridge complex urban area or The construction can be easily performed even where there is no space for the drilling space on the river, and the reduction of the cross section and deflection of the arch member is controlled to provide a structurally stable arch bridge and its construction method.

The present invention is an arch bridge composed of a composite girder and an arch member thereon, the composite girder is a flange is formed at the bottom and the steel is applied upward upward, and placed on the outside of the steel to the center of the composite bridge, respectively Synthetic girder composed of a concrete portion serving as a supporting portion is configured on both sides, characterized in that consisting of a bottom plate member placed in the supporting portion.

In addition, the present invention proposes a structure in which the arch member is fastened to the upper portion of the composite girder, a plurality of support blocks on the composite girder, and a pair of concrete is filled in the interior of the upper support block in this structure A cover block covering the arch member and the support block, and a fastening means for fastening the support block and the cover block.

In the present invention as the fastening means proposes a support rod is attached to the steel and fixed to the top of the cover block while penetrating the support block and the cover block.

In addition, the composite girder is configured to constitute a shear reinforcement portion protruding on both ends, respectively, and one end of the shear reinforcement portion is configured to form an inclined surface to fasten the arch member.

In addition, the arch member is configured to inject concrete into the interior of the injection hole formed on both ends and the cover for opening and closing the injection hole to inject concrete at both ends through the injection hole to be sealed using the cover It is composed.

Furthermore, by forming a through hole at the central portion of the arch member and forming a cover to open and close the through hole, the air is discharged to the outside by the concrete injected through the injection hole and the cover is exposed when the concrete is exposed to the outside of the through hole. It can be configured to be sealed using.

On the other hand, the cross section of the arch member may be configured in various ways, for example, the surface in contact with the cover block is preferably configured to have a larger width than the surface in contact with the support block to have a more advantageous structure in terms of rigidity.

In addition, the composite girder is preferably configured so that the tension member is inserted in the longitudinal direction to introduce the prestress in the horizontal and vertical directions.

In addition, it is reasonable that the support frame is further configured to install a bottom plate member capable of passage of a pedestrian or a vehicle on the upper portion of the base of the composite girder.

On the other hand, the present invention proposes an arch bridge construction method, the arch bridge construction method of the present invention comprises the steps of manufacturing a composite girder; Installing a bottom plate member; Installing a support block on the composite girder; An arch member installation step;

Compound girder tension step; Arch member fixing step; Synthetic girder tension release step; characterized in that consisting of.

In the manufacturing step of the composite girder is to install a support rod as a fastening means with the arch member and at the same time to introduce the preflex to the composite girder by embedding the tension member in the steel that gave rise in advance and then the concrete part in the vertical load applied state It is characterized by including the.

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to FIGS.

Figure 1 is a side cross-sectional view showing the arch bridge of the present invention, Figure 2 is a cross-sectional view of the AA portion in Figure 1, Figure 3 is an exploded perspective view of the AA portion in Figure 1, Figures 4a and 4d is one of the present invention 5A and 5B are a perspective view and a cutaway cross-sectional view showing an arch member which is one configuration of the present invention, and FIGS. 6A and 6B are views illustrating a support block and a cover block as one component of the present invention. 7A to 7G are flow charts showing the method for constructing the arch bridge of the present invention, and FIG. 8 is a block diagram showing the method for constructing the arch bridge of the present invention.

The present invention is composed of a composite girder 100 and the arch member 400 on the top and blocks 310, 320 for fastening the composite girder 100 and the arch member 400 and the support rod 500 as a fastening means. It is about an arch bridge.

First, as shown in FIGS. 2 and 3, and FIGS. 4A to 4D, the composite girder 100 has a lower flange 111 formed thereon, and upwardly applied to the steel 110 and the outside of the steel 110. Synthetic girder 100 is formed on both sides is placed on both sides, the base portion 120, 123 is formed in the direction of the center of the composite bridge, and is composed of a bottom plate member 200 is placed on the base 123.

As shown in FIGS. 4A to 4D, the steel 110 is a member having a cross section of a “J” shape and a “자” shape and installed at both ends of the bridge as shown in FIGS. 4A and 4B. The composite girder 100 is formed together with the concrete unit 120 to be configured to support the bottom plate member 200. Steel 110 having a "J" shape is composed of a lower flange 111 and the upper frame 112, in detail, the plate-shaped orthogonal to the upper frame 112 at the end of the upper frame 112 An upper flange 113 is attached, and a plurality of fastening rods 115 are attached to the lower flange 111 in the longitudinal direction (the vehicle moving direction in the bridge). The upper flange 113 is fastened to the support bar 500 to be described below, as shown in Figures 2 and 3, this fastening can be used a variety of known techniques, for example fastening by the bolt coupling 510 It is possible. The fastening rod 115 is exposed on the concrete portion 120 to be described below to hold the bottom plate member 200 or to form a support frame 210 when the function as a means for fastening the support frame 210 do. The fastening of the fastening rod 115 and the support frame 210 can also be used in the known art, it is natural that the fastening by bolt coupling is also possible. In addition, by the configuration of the fastening rods 115 such that the attachment of the steel 110 and the concrete portion 120 to perform the function of the shear connector.

In addition, when the steel 110 has a large bridge width, as shown in FIGS. 4C and 4D, a structure in which the steel 110 is installed at the center of the bridge is added to the cross section of the “ㅗ” shape. Other points are configured differently around the 112, and the other structure has the same structure as the structure installed at both ends of the bridge shown in Figures 4a and 4b.

In addition, the steel 110 is configured to receive the compression from the arch member 400 as well as reinforcement for the shear by further configuring the shear reinforcement frame 114 as shown in Figure 4b and 4d at both ends. do.

On the other hand, the manufacturing order of the composite girder 100 is placed in the concrete portion 120, that is, the flange 111 in a state in which the vertical load is applied to the steel 110 after the preliminary rise to the steel 110. Precast composite girder 100 to introduce the pre-stress to the primary concrete portion 121 by first placing the first concrete portion 121 to be placed in the center portion where the tensile force largely acts, and then to both ends sequentially and to remove the vertical load It is preferable to comprise). By configuring the preplex composite girder 100 as described above, the mold height of the composite bridge 10 can be lowered.

The composite girder 100 is the support portion 123 is formed by the first large concrete portion 121, the bottom plate member 200 or the support frame 210 is placed by the configuration of the support portion 123 The composite bridge 10 is constructed.

The composite girder 100 is a structure in which the concrete portion 120 is poured into the shape of the steel 110, and after pouring the primary concrete portion 121, the secondary concrete portion 122 in the upper frame 112 portion. ) Is poured to form the upper support 124. The secondary concrete part 122 is a state in which the support rod 500 is poured in the state in which the support rod 500 is fastened to the upper flange 113, and the support rod 500 is firmly attached to the composite girder 100 by such a configuration. will be.

The composite girder 100 is composed of a shear reinforcement portion 130 protruding from each end, the shear reinforcement portion 130 is formed integrally with the shear reinforcement frame 114 and the upper frame 112 mentioned above. In addition, the upper flange 113 is formed by attaching half to the both sides of the shear reinforcement frame 114, the inside of the reinforcing flange should be arranged to be sufficiently attached to facilitate the stress transfer, such as the arch connection and the lower support. Shear is reinforced by both ends of the composite girder 100 by the shear reinforcement 130. In addition, one end of the shear reinforcement portion 130 forms an inclined surface 131, the arch member 400 by installing an integrated upper flange 113 having a continuity from the center of the composite girder 100 along the inclined surface 131. As well as to facilitate the fastening and will be configured to receive the compression from the arch member (400). As such, both ends of the composite girder 100 constitute the shear reinforcement 130, but the upper support portion 124 having a low height in series with the inclined surface 131 is configured to reduce the overall weight. Etc., ease of workability.

In addition, the composite girder 100 may be inserted into the tension member 140 in the longitudinal direction to introduce the prestress in the horizontal direction, as well as the support block 310 to be described below by the release of the tension of the tension member 140. And a prestress in a vertical direction to the cover block 320.

The bottom plate member 200 may be configured in various ways, such as slab, wood, steel made of reinforced concrete made in the factory and bar can be cast in the field after assembling reinforcement using the bottom frame 210, the allowable load It may be selectively configured in consideration of the like.

In addition, the bottom plate member 200 is not shown in the drawing, but at both ends of the composite girder 100, that is, the shear reinforcement portion 130, the support 123 and the support so that the composite girder 100 can be restrained from each other. The parts 123 should be connected to each other through precast concrete or cast-in-place concrete, that is, horizontal beams, and at this time, the bottom plate member 200 is also installed in a batch so that both ends of the composite girder 100 may be strongly bound. At this time, by inserting a steel bar or reinforcing bar inside the cross beam serves as a tension member to connect the supporting portion 123 to each other to form a stable composite bridge of the grid structure.

The horizontal beam is a sphere that connects both ends of the composite girder 100 and the horizontal beam should be applied to the central portion except the end. However, instead of the cross beam, the central portion may be connected to the supporting portions 123 by only steel bars and reinforcing bars to perform a role as a tension member.

In the case where the deformation occurs in the bottom plate member 200 on the upper support frame 210 after the construction is formed by the protruding end 211 is formed in contact with the upper support portion 124 in the corner portion of the support frame 210. It is configured to hold this.

Meanwhile, in the present invention, a structure in which the arch member 400 is fastened to the upper portion of the composite girder 100 is provided, and in this structure, a plurality of support blocks 310 and the support block on the composite girder 100 are provided. 310 is fastened with a pair of arch members 400 and the cover block 320 covering the support block 310 and the support block 310 and the cover block 320 is filled with concrete is placed inside the upper Present the fastening means.

As shown in FIG. 1, the support block 310 has a longitudinal direction (the length direction is a direction in which a person or a vehicle passes in a bridge) in a composite girder 100 which is constructed on an upper portion of a lower structure 1 such as shifts and piers. As shown in Figure 6a and 6b in more detail, as shown in Figure 6a and 6b, the cross section is presented in the shape of a square, but is not limited to this may be configured in various ways, such as a circle.

The support block 310 is a structure that is fastened to the upper portion of the upper support portion 124 of the concrete portion 120 when the material is composed of reinforced concrete, constructing the support block 310 by reinforcing the formwork and reinforcement and pouring concrete More preferably, it is appropriate to construct by simple assembly in the field as a precast block by workmanship. The support block 310 is formed with a through hole 312 through which the support bar 500 to be described below is formed, and the settling groove 311 in which the arch member 400 is placed is formed on the upper surface.

The settling groove 311 is preferably inclined to form a variety of shapes of the arch member 400 according to the position of the support block 310 will be configured so that the arch member 400 on top of the support block 310 As it is firmly placed, the composite girder 100 and the arch member 400 exert a function as a bridge in which they act integrally.

The arch member 400 is a long rod shape is filled with concrete 470 therein, the cross-section may be configured as shown in Figure 5a circular, as shown in Figure 5b cover block 320 Surface 450 in contact with the width may be larger than the surface 460 in contact with the support block 310. In other words, the upper surface is wide and the lower surface is composed of an inverted trapezoidal shape or an inverted triangle shape. Since the cross section of the arch member 400 is configured as shown in FIG. 5B, the height of the arch member 400 is increased, and since the "I" value is increased due to the effect of increasing the height, the rigid surface There is an advantage in that. The material of the arch member 400 may be made of steel, but may be selected in various cases. For example, the arch member 400 may be made of FRP having corrosion resistance and ductility under corrosive environments. More preferably, the FRP attaches the reinforcing material and selectively uses materials suitable for the construction conditions using CFRP (Carbon), AFRP (Aramid), GFRP (Glass), etc. By using it, it has a function to reduce the weight and facilitate the construction.

The arch member 400 forms a hollow therein as shown in FIG. 5A, and injection holes 410 are formed at both ends of the arch member 400 so as to communicate with the hollow, and the concrete 470 is filled in the hollow. It is preferable. Therefore, after the arch member 400 is installed, the concrete 470 is injected through the injection hole 410 to fill the hollow. In addition, when the filling of the concrete 470 in the injection hole 410 is completed is configured to seal the injection hole 410 by using a cover 420. The cover 420 may be configured in various ways, but may be configured to open and close the injection hole 410 by configuring a bolt as shown in Figure 5a. In addition, it may be necessary to determine whether the concrete 470 is completely filled through the injection hole 410. To this end, a through hole 430 is formed at the center of the arch member 400 to fill the concrete 470. The air is drawn out inside the hollow and the through hole 430 is configured to seal the through hole 430 with the cover 440 at the time when the concrete 470 is exposed. The cover 440 may also be configured of a bolt. Thus, the cross-section is reduced, the material cost is reduced, and the construction is easier than the case of constituting only the arch member by the concrete by the arch member 400 filled with concrete 470.

The cover block 320 is configured to be installed with the arch member 400 on the upper end of each of the support block 310 as shown in Figure 1, etc. In more detail as shown in Figure 6a and 6b The height of the column is lower than that of the block 310, the cross section of which is presented in the shape of a quadrangle, but is not limited thereto. The cover block 320 is a structure attached to the top of the support block 310 is formed through hole 322 through which the support rod 500 to be described below is formed and the arch member 400 is placed on the lower surface Grooves 321 are formed. The settle groove 321 has a shape opposite to the settle groove 311 formed in the support block 310 and the support block 310 and the cover block 320 in contact with the arch by the respective settle grooves (311, 321) Member 400 is firmly placed. Therefore, in the case of the settling groove 321, the inclination should be formed in accordance with the shape of the arch member 400 according to the position of the cover block 320 will be formed by this configuration of the support block 310 and the cover block 320 Between the arch member 400 will be firmly seated. In the case of the cover block 320, it may be preferable to use the precast block produced by the factory to be configured so that the final construction only by assembly construction.

In addition, in the present invention, the composite girder as a means of fastening the support block 310, the cover block 320 and the arch member 400 is placed between the support block 310 and the cover block 320 ( A support rod 500 attached to the support block 310 and penetrating the support block 310 and the cover block 320, that is, penetrating the respective through holes 312 and 322 and fixed to the top of the cover block 320, is provided. Presented. The support rod 500 may be PS steel wire, PS steel rod, etc. may be used to be attached to the vertical girder 100, this attachment is the secondary concrete portion in the state of being fastened to the upper flange 113 of the steel 110 The support rod 500 is attached to the composite girder 100 by placing the upper support portion 124 by pouring the 122, and the fastening of the support rod 500 to the upper flange 113 is, for example, a bolt coupling 510. Can be fastened by In addition, the support rod 500 may be fastened by the bolt coupling 510 as an example of attachment from the top surface of the cover block 320. The number of the supporting rods 500 may be variously configured in consideration of the rigidity of its attachment per each supporting block 310 and the cover block 320 and the prestress to be introduced. In FIG. 6B, four supporting rods 500 may be provided. An example of the configuration is shown.

Meanwhile, in the present invention, the arch bridge construction method is described. The arch bridge construction method of the present invention will be described with reference to FIGS. 7A to 7G and FIG. 8.

First, as shown in FIG. 7a, the composite girder 100 is manufactured on the upper portion of the lower structure (S1). In this step, after installing the steel 110 in a state in which the rise is applied to the steel 110, the necessary reinforcing bar is placed and the tension member 140 is mounted. Thereafter, when the concrete portion 120 is placed on the steel 110, the primary concrete portion 121 is poured from the center portion to the both ends in the state in which the vertical load is applied to the steel 110, and the primary concrete portion 121 is placed. If is poured, remove the vertical load. Installation of the composite girder 100 into which the preflex is introduced is carried by carrying the composite girder 100 on-site and placing the composite girder 100 on the upper part of the substructure such as shifts and piers.

Thereafter, as shown in FIG. 7B, the bottom plate member 200 is installed (S2). The bottom plate member 200 is installed in the supporting part 123 formed by the composite girder 100 completed in the step S1. In this step, the composite girder 100 is connected to each other in an end crossbeam and the support frame 210 is formed. ) While installing the bottom plate and the secondary concrete part 122 in parallel. At this time, after installing the support bar 500 protruding to the outside of the composite girder 100, the secondary concrete part 122 should be poured. In addition, the bottom plate except the site casting should be poured a second concrete unit 122 separately. In order to install the bottom plate member 200 on-site, the support frame 210 is first installed on the support part 123 and then the bottom plate member 200 is installed on the support frame 210. Can be. At this time, the support frame 210 simultaneously serves as the formwork of the bottom plate and the tension member of the bottom plate. Therefore, the support frame 210 should be fastened to the fastening rods 115 protruding out of the composite girder 100 through screwing.

Then, as shown in Figure 7c has a support block 310 installation step (S3) on the composite girder 100. In this step, the support rod 500 protruding to the outside of the composite girder 100 is inserted to pass through the through hole 312 formed in the support block 310.

As a next step, as shown in FIG. 7D, an arch member 400 is installed (S4). In this step, both ends of the arch member 400 are installed on the inclined surface 131 formed at both ends of the hinged fasteners or fixed fastening, and the arch member 400 is placed on the support block 310. .

It then has a composite girder tension step S5 as shown in FIG. 7E. In this step, it is a step of giving rise to the composite girder 100 by tensioning the tension member 140 pre-configured in the composite girder 100. The arch member is supported by the support bar 500, the support block 310, and the cover block 320 in the next step S6 in which the compound girder 100 and the arch member 400 are connected by giving rise to the compound girder 100. In fixing the 500, it is possible to prevent excessive tension from occurring in each support rod.

Next, as shown in FIG. 7F, the arch member 400 has a fixing step S6. In this step, the cover block 320 is installed on the support block 310 and the arch member 400 placed thereon, and the support bar 500 passes through the through hole 322 formed in the cover block 320. Pass through and fasten the support bar 500 to the cover block 320 through the screw coupling 510 in the upper cover block 320. By giving rise in the step S5 it is easy to fasten the cover block 320 through the support bar 500 in the upper arch member 400.

Finally, as shown in FIG. 7g, the composite girder is released in step S7. In step S5 it is to have a step of releasing the tension to the tension material 140, a part or all of the applied tension force. By doing so, the pier deck 10 is moved to its original position or when the horizontal prestress to some extent is required, and at the same time, the tension is naturally applied to the plurality of support rods 500, so that the respective support rods 500 are the same. Tensile force is given. Thus, the tensile force is applied to the support bar 500, the pre-stress, that is, compressive force is generated in the support block 310 and the cover block 320 is to be able to increase the load capacity of the arch member 400 for the additional load. .

Although the above description has been made with reference to the embodiments of the present invention, the present invention is not limited to the above-described embodiments, and those skilled in the art will recognize that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description in the specification but should be defined by the claims.

By the above configuration, the present invention has the following effects.

First, the bridge can be constructed in long spans while reducing the height of the pier deck.

Second, since the construction of the arch bridge can be installed in the upper part of the bridge sequentially without the support of the Dongbari, it is easy to construct even in the long bridge.

Third, since the composite girder is connected to the arch member and has a shape of a halo bridge, the bottom plate member has only a protruding support portion, so that it can be installed even in a place where existing bridges, such as rivers and urban areas, which are restricted in the space of the geometry, are difficult to install. There is an advantage.

Fourth, there is an advantage to reduce the cross-section of the arch member as the concrete filled in the arch member subjected to the compression and strongly coupled with the composite girder by the support block and the cover block.

Fifth, the composite girder has a shear reinforcement only at both ends, thereby reducing its own weight, thereby facilitating construction during site placement by transportation and cranes, and also having an arch member to reduce its own weight by filling concrete.

Claims (11)

delete In the arch bridge composed of a compound girder and an arch member thereon, The composite girders are formed at both ends of the composite girders formed of a flange formed in the lower portion and the steel is applied upward upward, and a concrete portion which is placed on the outside of the steel and the support portion is formed in the center direction, respectively, Characterized in that consisting of the bottom plate member, The composite girder includes a plurality of support blocks; An arch member disposed on the support block and filled with concrete therein; A cover block covering the support block; Arch bridge, characterized in that consisting of; fastening means for fastening the support block and the cover block. The method of claim 2, The fastening means is an arch bridge, characterized in that consisting of a support rod fixed to the upper end of the cover block while passing through the support block and the cover block attached to the steel. delete The method of claim 2, The arch member is an arch bridge, characterized in that consisting of a cover for opening and closing the injection hole formed in both ends. The method of claim 5, The arch bridge, characterized in that the central portion of the arch member comprises a cover for forming a through hole to open and close the through hole. The method of claim 2, The arch member is an arch bridge, characterized in that the surface in contact with the cover block is configured to have a larger width than the surface in contact with the support block. delete delete In the arch bridge construction method, Synthetic girder manufacturing step; Installing a bottom plate member; Installing a support block on the composite girder; An arch member installation step; Compound girder tension step; Arch member fixing step; Composite girder tension release step; Arch bridge construction method characterized in that consisting of. delete

Images