KR101052305B1 - Construction method of composite ramen bridge which is manufactured in simple beam form and minimizes bending moment generated at the point - Google Patents

Abstract

The present invention relates to a construction method of the composite ramen bridge, the manufacturing step of the central composite girder for synthesizing the casing concrete around the lower flange of the steel girder; Introducing a compressive stress into the casing concrete by pulling a tension material pre-installed in the casing concrete of the central composite girder; Manufacturing a simple girder by connecting the steel girders to which the casing concrete is not synthesized by welding or bolting at both ends of the central composite girder in the axial direction; Simply mounting the simple girders at both ends such that both ends of the simple girders are positioned on a simple support base installed on an upper portion of a shift previously constructed so that a plurality of vertical reinforcing bars protrude upwards; The lap joint method of connecting a plurality of the main reinforcing bars to be passed through the outer edge of the upper edge of the both ends of the simple girder and a plurality of vertical reinforcing bars protruding above the alternating, overlapping adjacently arranged longer than a predetermined length A reinforcing bar connecting the vertical reinforcing bars and the main reinforcing bars in an excluded manner; Integrating the simple girder and the shift by simultaneously pouring concrete forming the alternating top and bottom concrete while wrapping the exposed steel of the simple girder; Including the construction of integrating the superstructure and the substructure as late as possible, not only suppresses the occurrence of large parent moments in the ramen corners, but also at the manufacturing stage, in addition to restraining the composite girders at the top of the alternation in the construction of the ramen bridge. The stable mounting provides a method of constructing a composite ramen bridge that realizes a longer ramen bridge even with a simpler work and a smaller cross section girder bridge.

Bridge girder, bending moment, ramen, bridge, simple mounting

Description

INSTALLATION METHOD OF RAHMEN BRIDGE WITH COMBINED GIRDER OF STEEL GIRDER AND CONCRETE WITH MINIMIZED NEGATIVE MOMENT AT ENDS THEREOF}

The present invention relates to a method for constructing a synthetic ramen bridge, and more particularly, to minimize the large parent moment acting on both ends of the bridge in the process of manufacturing the ramen bridge, and to simplify the construction of the composite ramen bridge at a low cost. It is about construction method of synthetic ramen bridge.

Among the related arts related to the Ramen Bridge consisting of the upper structure such as the bottom plate and the lower structure supporting it, the upper structure relates to the composite ramen bridge of the type in which steel girder and concrete are combined. Patent Publication No. 10-543969, Republic of Korea Patent Publication No. 10-770574, Republic of Korea Patent Publication No. 10-742206.

According to the Republic of Korea Patent Publication No. 10-543969 in the prior art, as shown in Figures 9a and 9b, the composite girder 104 of the upper portion of the bridge is on a plurality of walls or alternating 102 installed on the ground Completed by pouring the remaining concrete in the installed state to be combined with the rigid steel girders (103). However, the ramen bridge constructed in this way is different from the existing ramen bridges with reinforced concrete, and steel girders are built in the upper structure of the bridge and at the corners of the ramen. Although there is an advantage that the distance between the two can be increased, the edge of the ramen bridge before the remaining concrete is already joined to connect the steel structure with the predetermined rigidity, so that the large parent moment occurs in the steel at the edge of the remaining concrete There was a problem, in particular, there was a problem in that the construction of the connection steel girder 103 between the upper composite girder and the substructure is difficult.

In addition, according to the Republic of Korea Patent Publication No. 10-770574 in the prior art, as shown in Figures 10a and 10b, integrally fixed to any predetermined portion of the vertical wall (shift, 202) by the girder fixing device. The supporting steel mold is installed as much as possible, and the supporting girders 203 and the composite girders 204 are mounted on the supporting steel molds 203 in a state where the composite girders 204 are fixed in a state where a slight displacement is allowed by the steel bar 203a. A technique for manufacturing a ramen bridge is disclosed by pouring residual concrete and upper concrete into vertical walls (alternately, 202) incorporating. However, this method involves a problem that the construction is cumbersome and costly as the work to be fixed to the heavy support steel mold 203 on the top of the shift 202 and the support steel mold 203 and the composite girders 204 It is fixed with steel rods, which constrains the expansion and contraction displacement of the upper girder 204 due to temperature changes during upper work and long-term mounting, and transfers it to the supporting steel 203, causing bending deformation to the supporting steel 203, resulting in structural safety. Not only has the problem of lowering the construction, but also includes a construction that simply mounts the composite girders 204 on the fixed supporting steel 203 extending from the shift long, the construction is unstable and dangerous also had problems.

In order to solve the problems described above, the present invention can minimize the large parent moment acting on both ends of the bridge in the process of manufacturing the ramen bridge and at the same time safe and simplified construction of the composite ramen bridge at a lower cost The purpose of the present invention is to provide a method for constructing a synthetic ramen bridge.

In addition, the present invention in the manufacture of the ramen bridge by extending the length from the shift as in the prior art, by installing a support girder to produce a higher height closer to the position of the superstructure that is finally installed in the alternation than in the prior art by replacing the composite girder In the mounting on top of the other purpose to be able to mount more securely.

In addition, the present invention is to exclude the means for connecting the steel girder and the composite girder with bolts or rods as in the past when the composite girders are alternately placed, the expansion and contraction displacement occurring in the upper girder due to the temperature change during the upper operation Another goal is to build a more secure ramen bridge by not restraining it.

In addition, the present invention ensures a sufficient working space between the pre-fabricated superstructure and the substructure during the construction of the bridge, and at the same time to withstand the tensile stress generated in the concrete of the ramen corners after the integral construction of the superstructure and the substructure Another object is to make it easier to connect the main reinforcement of the outer upper edge portion with the vertical reinforcing bars protruding from the alternation.

And since the present invention is constructed by a general simple beam type bridge fabrication method, a ramenization type that connects the superstructure and the substructure integrally while the bending moment due to the weight of the superstructure does not act on the ramen edge. As it is carried out, it is another object that the parental moment acting on both ends is not generated by self-weight (except secondary fixed load such as packaging).

And another object of the present invention to more effectively introduce the prestress to the composite girder in manufacturing the composite girders mounted on the upper portion of the shift.

The present invention is the manufacturing step of the central composite girder for synthesizing the casing concrete around the lower flange of the steel girder to achieve the object as described above; Introducing a compressive stress into the casing concrete by pulling a tension material pre-installed in the casing concrete of the central composite girder; Manufacturing a simple girder by connecting a steel girder, to which no casing concrete is synthesized, by welding or bolting in opposite directions to both ends of the central composite girder; Simply mounting the simple girders at both ends such that both ends of the simple girders are positioned on a simple support base installed on an upper portion of a shift previously constructed so that a plurality of vertical reinforcing bars protrude upwards; The lap joint method of connecting a plurality of the main reinforcing bars to be passed through the outer edge of the upper edge of the both ends of the simple girder and a plurality of vertical reinforcing bars protruding above the alternating, overlapping adjacently arranged longer than a predetermined length A reinforcing bar connecting the vertical reinforcing bars and the main reinforcing bars in an excluded manner; Integrating the simple girder and the shift by simultaneously pouring concrete forming the alternating top and bottom plate concrete while covering the exposed steel of the simple girder; It provides a construction method of the synthetic ramen bridge, including.

This means that the composite girder at the center where concrete is synthesized in the steel girder and the steel girder at the end where the concrete is not synthesized are introduced, and compressive stress is introduced into the casing concrete of the central composite girder and then connected to the steel girder at the end. This is to make the work of introducing compressive stress into the casing concrete of the central composite girder used in the ramen bridge much easier.

In addition, as in the prior art, a method of firmly joining the composite girder and the shift between the upper part using a pre-prepared steel or simply placing concrete on the branch portion is preferred. By wrapping the steel of the simple girder in the mounted state and simultaneously constructing the bottom plate concrete and the alternating upper concrete at the same time, it is possible to postpone the work to integrate the superstructure and the substructure at a later time, so that the large parent moment occurs at the edge of the ramen. By suppressing this at the manufacturing stage, a method of constructing a composite ramen bridge that realizes a longer length ramen bridge even with a simpler work and a smaller cross section girder bridge is provided.

Above all, in general, the ramen bridge is formed of 'I' or I-shaped steel in order to withstand the parent moment acting on both ends of the common structure as the upper and lower structures are integrally joined by concrete. Unlike the conventional structure that was synthesized with concrete for a certain length of the upper side of the shift, the main reinforcing bars were arranged in a 'b' shape outside the upper edges of both ends of the simple girder and connected in a narrow space with the vertical bars protruding from the alternating side. By connecting and supporting by welding or reinforcing bar coupler, it is possible to mount the composite girder more stably in the manufacture of the ramen bridge, and the construction of the ramen bridge by simpler construction.

At this time, in connecting the vertical reinforcing bars protruding over the alternating main reinforcing bars passing through the outer edges of the upper edges of both ends of the simple girder, the height of the shift is substantially reduced by excluding the overlap that requires much space for the reinforcing bar connections. The composite girder of the finished ramen bridge can be formed so high as to sandwich only the support for simple support such as a cylindrical steel pipe.

That is, in the reinforcing bar connection step, male threads formed in different directions at the connection end portions of the vertical reinforcing bars and the main reinforcing bars are fastened and coupled to female threads formed at both ends of the reinforcing bar coupler, and the male threads and the female threads are fastened. At is made by rotating the reinforcing bar coupler and the vertical reinforcing bar and the main reinforcing bar. Optionally, the connecting ends of the vertical reinforcing bars and the main reinforcing bars may be coupled to each other by welding.

In addition, since the self-weight of the casing concrete is supported by the steel material during the manufacture of the composite girder, the tensile stress due to the self-weight does not act on the casing concrete, thereby reducing the magnitude of the tension for introducing the compressive stress into the casing concrete. To make ramen bridges at low cost.

In addition, in order to efficiently introduce prestress to the composite girder in the middle of the girder, the casing concrete is exposed from the end of the composite girder in the length of 0.3 m to 1.0 m in the longitudinal direction. By doing so, the tensioning work in the casing concrete is made smoothly and at the same time the connection with the end steel girders is made easier. At this time, when the exposed length of the steel is less than 0.3m, the connection work between the central composite girder and the end steel girder is not easy, and when the exposed length of the steel is larger than 1m, the casing concrete is excessively less synthesized and thus the casing concrete This is not desirable because the tension in Esau is lacking in smooth operation.

In this way, the steel is exposed on both ends of the composite girder in the middle, and the distance between the casing concrete end composed of the composite girder and the end of the steel girder composed only of the steel is long and the tension is difficult and uncomfortable. It is possible to improve the point that prestress is not efficiently introduced into the girder.Before making the simple girder by connecting the steel girder for the end made of steel only and the composite girder with the casing concrete, first, the casing concrete and the longitudinal direction of the composite girder By keeping the length of the protruding steel end within a certain range, the compressive stress (prestress) caused by tensioning work can be efficiently introduced into the composite girder, and in the future, the end steel girder can be connected to both sides of the composite girder with prestress. Effective simple girders can be completed.

On the other hand, the term 'shift' as used in the present specification and the claims are used to mean a substructure supporting the girder, etc. to manufacture the bridge, in the case of a bridge in which the girder is continuously arranged in the axial direction The term 'pier' to support girders on both sides of the axial direction shall be used as a term.

In addition, the present invention comprises the steps of preparing a steel girder having a length corresponding to the distance between the support for the simple support is installed on the alternate; Synthesizing the casing concrete around the lower flange of the steel girder, the casing concrete to produce a simple girder by synthesizing with the steel girder only a certain section of the center; Introducing a compressive stress into the casing concrete by pulling the tension material pre-installed in the casing concrete of the simple girder; Simply mounting the simple girders at both ends such that both ends of the simple girders are positioned on a simple support base installed on an upper portion of a shift previously constructed so that a plurality of vertical reinforcing bars protrude upwards; A lap joint method of connecting a plurality of main reinforcing bars that are reinforced so as to pass outside the upper edges of both ends of the simple girder with a plurality of vertical reinforcing bars protruding above the alternation, and adjacently arranged to overlap each other longer than a predetermined length. A reinforcing bar connection step of interconnecting the vertical reinforcing bars and the main reinforcing bars in a manner that excludes them; Integrating the simple girder and the shift by simultaneously pouring concrete forming the alternating top and bottom plate concrete while covering the exposed steel of the simple girder; It provides a construction method of the synthetic ramen bridge, including.

This means that it is also within the scope of the present invention that the simple girder may not be manufactured by combining the central composite girder and the end steel, but may be manufactured by synthesizing concrete in the central portion of one steel girder.

On the other hand, the present invention, the manufacturing step of the central composite girder for synthesizing the casing concrete around the lower flange of the steel girder so that the casing concrete weight is placed on the steel girder; Introducing a compressive stress into the casing concrete by pulling a tension material pre-installed in the casing concrete of the central composite girder; A simple girder fabrication step of connecting both ends of the steel girder and the end of the central composite girder formed of only steel materials not synthesized with the casing concrete with welding or bolts in the axial direction; Simply mounting the simple girder on a temporary pier adjacent to the alternate so as to secure a space in the vertical direction between an end of the simple girder and an upper portion of the previously constructed shift; Connecting a plurality of main reinforcing bars that are reinforced so as to pass outside the upper edges of both ends of the simple girder with a plurality of vertical reinforcing bars protruding above the alternation; Integrating the simple girder and the shift by simultaneously placing concrete which forms an alternating top and bottom plate concrete while wrapping the exposed steel of the simple girder; Removing the temporary piers installed adjacent to the shifts; It provides a construction method of the synthetic ramen bridge, including.

This improves the workability when the work space is small when the simple girder and alternating construction of the upper part are integrated, and at the same time, shifts the reinforcing bar reinforced to pass through the outer side of the ramen edge where the tensile stress acts after the integrated construction. This is to facilitate the work to connect the vertical reinforcing bar to be protruded to.

At this time, by providing the temporary pier at a position adjacent to the alternating surface, it is possible to reduce the size of the parent moment of the ramen edge portion caused by the boundary condition change caused by the removal of the temporary pier.

In addition, the present invention is to synthesize the steel girder and the casing concrete so that the weight of the casing concrete to the steel girder, but the casing concrete is synthesized only in a certain section of the center and the casing concrete is not synthesized in a certain section of the end except this A simple girder fabrication step; A compressive stress introduction step of introducing a compressive stress into the casing concrete by pulling a tension material pre-installed in the casing concrete of the simple girder; Simply placing both ends of the simple girder on the shift so that the steel girder at the end of the simple girder is positioned on a simple support base installed on the previously constructed shift; Integrating the simple girder and the shift by simultaneously pouring concrete forming the bottom plate of the bridge and the upper part of the bridge while wrapping the steel of the simple girder; It provides a construction method of the synthetic ramen bridge, including.

On the other hand, the steel girder in the concrete girder position is not placed in the simple girder so that the height of the abdomen is formed as the approach to both ends of the simple girder, the greater the cross-sectional coefficient of the girder as the approach to both ends of the bridge girder, the greater the parent It can effectively withstand the comment. In addition, by increasing the height of the abdomen to approach both ends, the lower flange that interferes with the tension device during the tension work to introduce a compressive stress to the composite girder away from the tension device enables a more effective tension work.

As described above, the present invention does not connect between the upper structure and the lower structure by the steel or the like in the process of integration of the bridge superstructure and the lower structure, it wraps the steel of the superstructure in the state in which the upper structure is simply placed on the lower structure. At the same time, by constructing the bottom plate concrete and alternating upper concrete at the same time, the work to integrate the superstructure and the substructure at a later time is suppressed, so that the large parent moment is generated at the edge of the ramen at the production stage. It provides a method of constructing a composite ramen bridge that can realize a long ramen bridge even with a smaller cross section girder bridge.

In addition, the present invention eliminates the 'b'-shaped or straight I-shaped steel on the unnecessary shifts conventionally used in the manufacture of the ramen bridge, the higher the closer to the position of the superstructure to finally install the shift than conventional It can be manufactured at a height so that the girder forming the superstructure can be mounted more securely in the upper part of the shift.

And the present invention, by eliminating the use of bolts or steel rods integrally connecting the 'G' shape or straight type I-shaped steel and the upper girder mounted on the I-shaped steel on the shift used in the past, during the upper work after mounting Since the expansion and contraction displacement of the upper girder caused by the temperature change is not restrained, the cross-sectional force due to the bending deformation does not occur on the alternating structure so that it is structurally safe construction.

In addition, the present invention, by simply mounting the upper girder by a temporary pier, by ensuring a sufficient space in the vertical direction between the shifted upper portion and the simple girder, the operation according to the integration of the upper girder and the shift more easily At the same time, by making the reinforcement of the cast iron reinforcement of the ramen corner portion more easily, it has an advantageous effect of increasing the efficiency of the production.

In addition, the present invention is to suppress the occurrence of the cross-sectional force caused by the weight of the ramen by performing the work to integrate the superstructure and the lower structure in a state in which the bending moment due to the weight of the upper girder does not act on both ends Accordingly, even when the live load is applied, the momentum acting on the ramen edge is greatly reduced so that safety can be ensured with only a lower amount of outer upper edge reinforcing bars.

Therefore, the present invention is to install a simple supporting steel material that can accommodate the rotational displacement of the upper girder end in the upper part of the shift, so that the bending moment is not generated in the corner of the ramen before integrating the upper girder and the lower structure into concrete It is possible to do

In addition, when the upper girder is manufactured, the composite girder at the center where the concrete is synthesized and the steel girder at the end where the concrete is not synthesized are introduced into the composite girder at the center, and then the compressive stress is introduced to the composite girder at the center, and then connected with the end steel girder. As it is manufactured, the operation of introducing compressive stress to the composite girder has the advantageous effect that can be performed much simpler and easier to avoid the interference of steel.

In addition, the present invention, as the cross section of the steel girder, the concrete is not synthesized toward both ends to increase the height of the abdomen, it can effectively withstand the parent acting on both ends of the bridge girder by the live load. In addition, this has the advantageous effect that the steel lower flange, which interferes with the tensioning operation which introduces compressive stress into the composite girder, can be spaced farther from the tensioning device to perform a smoothing tensioning operation.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

The construction method of the synthetic ramen bridge according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1A to 1F, which show a sequential configuration according to the construction method of the composite ramen bridge according to the first embodiment of the present invention.

Step 1 : As shown in Figure 1a, to prepare a central steel girder 11 and the end steel girder 20. The shape is determined so that the camber is formed in a state where the center steel girder 11 and the end steel girder 20 are coupled to each other. In addition, the steel girder for the central portion can be produced in the form of segments when the interval of the upper structure is large, between each segment (11a) is usually welded by a plate (11b).

Step 2 : The steel girder 11 in the center is mounted under simple support conditions at both ends by the support 91 so as to be separated from the ground as shown in FIG. 1B, and the formwork 92 opens the lower flange of the steel girder 11. Install to wrap. At this time, the formwork 92 is installed to hang on the steel girder 11 by a plurality of vertical members (92a), when the concrete is poured and cured in the formwork 92 and synthesized with the steel girder 11, the weight of the casing concrete Is supported by the steel girder 11.

Step 3 : Then, the concrete is poured into the formwork 92 to produce the composite girder 10 at the center where the casing concrete 12 is synthesized, and then the casing concrete expresses the predetermined strength required for formwork demoulding. The formwork 92 suspended from the steel girder 11 is removed. Then, both ends are lifted with a crane or the like and placed on both ends of the holder 99 shown in FIG. At this time, the loading period of the manufactured central composite girder 10 is made until it is mounted on the shift 70, and when the dry shrinkage crack is concerned by the long-term loading, the position of the holder 99 is set to the central portion. The inside of the compound girder 10 may be adjusted. In addition, by maintaining the exposure length of the steel in the longitudinal direction protruding from the casing concrete end in the composite girder 10 to 0.3m to 1.0m in the future, the compressive stress introduction work of the casing concrete and the connection between the composite girder and the steel girder for the end This can be done smoothly.

Step 4 : Immediately before laying the composite girder 10 on the shift 70, the tension member 13 built in the casing concrete 12 is pulled by the hydraulic jack 3 in the stacked state shown in FIG. Compression stress is introduced into the casing concrete 12 of the composite girder 10. Here, the casing concrete 12 of the composite girder 10 is formed so as to surround the entire lower flange from one end to the other end except for a predetermined length for connection of both ends, the tension material ( 13) it is easy to pull the work to introduce a compressive stress to the casing concrete (12).

Step 5 : Then, as shown in Figure 1d, by combining the steel girder 20 of the end of the concrete is not synthesized in both ends of the center composite girder 10 to produce a simple girder (1). To this end, in a state where the steel girder 20 at the end is mounted on the holder 99 ', the central composite girder 10 and the steel girder 20 at the end are firmly connected using a plate 20a or the like. .

Meanwhile, the simple girder 1 may be manufactured by separately manufacturing the center composite girder 10 and the steel girder 20 at the end as shown in the figure and combining them 10 and 20, but alternately After preparing the steel girders of the length corresponding to the distance between the simple support bases installed in the upper portion, and then the casing concrete surrounding the lower flange only in the center of the steel girder is poured into the hanging formwork 92 of step 2, and then synthesized. The girders may also be fabricated by simply pulling the tension member with both ends of the girders and introducing compressive stress into the casing concrete.

In addition, the end of the steel girder 20 may be formed to have a constant cross section as shown in the figure, but in order to endure the bending moment that acts greatly, as the simple girder 1 'shown in FIG. The height of the abdomen may be formed by connecting a longer steel girder 20 '.

Step 6 : Then, as shown in Figure 1e, after the simple girder 1 combined with the central composite girder 10 and the end steel girder 20 is pulled up by a crane or the like simply mounted on the shift 70, , Reinforcing bar reinforcement 61 and the vertical reinforcing bar (71) protruding over the alternate 70 to pass the outer edge of the upper edge of both ends of the simple girder (1) with the reinforcing coupler (80).

Specifically, a male thread is formed at the end connection portion of the 'a' shaped main reinforcing bar 61 at the outer upper edge of both ends of the simple girder 1, and the vertical rebar exposed to the shift 70 connected to the main reinforcing bar 61. Male threads in the opposite direction are formed at 71, and reinforcing bar couplers 80 having female threads 81 formed at both ends in different directions to be fastened to these male threads are fastened with these bars 61 and 71, respectively. Connect. Then, when the reinforcing bar coupler 80 is rotated in either direction, these reinforcing bars 61 and 71 come closer to each other and are firmly coupled. If you want to release the connection of the reinforcing bars (61, 71) during construction, it is possible to rotate the rebar coupler 80 in the opposite direction.

On the other hand, the vertical reinforcing bar 72 of the alternating 70 that is not combined with the 'b' shaped main reinforcing bar 61 of the simple girder 1, and the sub-reinforcing bar 62 surrounding the lower flange of the simple girder is the upper structure of the ramen bridge Is embedded in concrete to reinforce compressive strength.

On the upper surface of the shift 70, as shown in Fig. 2, a portion 41 of the simple support base composed of the cylindrical steel pipe 40 is pre-installed to be embedded in concrete. The curved surface 42, which is formed as a circumferential surface of the cylindrical steel pipe 40 and exposed to the outside, is oriented so as to face the axial direction. Through this, the steel girder 20 at the end of both ends of the simple girder 1 is mounted on the circumferential surface of the cylindrical steel pipe 40, the rotational displacement of the simple girder 1 is allowed freely so that the bending moment acts on both ends. You will not. At this time, the steel girder 20 at the end is provided with a reinforcing material 21 in the vertical direction at the position in contact with the steel pipe 40 in order to suppress local deformation during operation, the cylindrical steel pipe 40 on the bottom of the lower flange Support plate 22 is attached to increase the contact area with the.

On the other hand, the simple girder 1 may be mounted on a simple support base composed of a pedestal 40 'and an elastic rubber base 43, as shown in Figure 3 on the upper surface of the shift 70. That is, a part of the upper flange 40a 'and the abdomen 40b' is exposed on the upper surface of the shift 70, and the vertical reinforcement material (ie, the remaining portion of the abdomen 40b 'and the lower flange 40c' are embedded in concrete) A pedestal 40 'to which 40d' is attached is installed in advance, and an elastic rubber support 43 is interposed below the simple girder 1 on the upper flange 40a 'of the pedestal 40', The rotational displacement of the simple girder 1 can be allowed in accordance with the elastic deformation amount of the elastic rubber support 43 to suppress the bending moment due to its own weight on both ends of the simple girder 1.

Here, the elastic rubber bearing 43 is a general name of the elastic bearing of the elastic material that can accommodate the rotational displacement of the simple girder 1 by its elastic deformation regardless of the physical shape or material.

In this state, since the simple girder 1 is simply mounted on both ends of the support for the simple support on the shift 70, the occurrence of the bending moment due to its own weight is suppressed at both ends thereof. By firmly coupled to the substructure by or by preferentially constructing the concrete of the ramen corners it is possible to solve the problem that a large parent was generated in the ramen corners during manufacturing.

Step 7 : Then, as shown in Fig. 1f, the concrete and the bottom plate concrete 30 and the alternating upper concrete 32 which surround the exposed steel portion of the simple girder 1 are placed at once, and the superstructure and Complete the synthetic ramen bridge with integrated substructure.

Hereinafter, a second embodiment of the present invention will be described in detail with reference to FIGS. 6A to 6F. However, in describing the second embodiment of the present invention, a detailed description of functions or configurations known by the above-described first embodiment will be omitted to clarify the gist of the second embodiment.

Since the construction method of the composite ramen bridge according to the second embodiment of the present invention is similar to the above-described first embodiment until the steps 1 to 5 before the simple girder 1 is raised, the simple girder 1 will be described below. Only steps 6 and 7 of raising and ramenizing integrally with the shift 70 will be described.

Step 6 : As shown in Figure 6e, by lifting the simple girder (1) combined with the central composite girder 10 and the end steel girder 20 with a crane or the like, the temporary pier (close to the alternating 70) ( 66) Simple mounting on the top. Through this, the space 55 in the vertical direction is formed between the end of the simple girder 1 and the upper portion of the shift 70.

This is to integrate the bridge girder 1, the upper structure of the ramen bridge, and the shift 70, which is the lower structure of the ramen bridge, with concrete 32, and the main reinforcing bars 61 corresponding to the tensile stress acting on the edge of the ramen bridge. In order to ensure a sufficient joint length in the joint of the vertical reinforcement 71 which is exposed to the upper portion of the shift 70, and to create a work space in the vertical direction, to facilitate the work according to the integration For sake.

In addition, the temporary pier 66 is to be installed in the position as close as possible to the alternating 70, it is possible to minimize the size of the parent moment of the ramen edge portion accompanying the change of the boundary condition resulting from the removal of the temporary pier 66 after integration. have.

Step 7 : Then, in FIG. 6F, the concrete and the bottom plate concrete 30 and the alternating upper concrete 32 which surround the exposed steel portion of the simple girder 1 are placed at the same time to integrate the superstructure and the substructure. The temporary pier is then removed to complete the composite ramen bridge.

The second embodiment of the present invention is similar to the first embodiment described above, the end of the steel girder 20 may be formed to have a constant cross-section as shown in the figure, in order to withstand a large bending moment Like the simple girder 1 'shown in FIG. 7B, it may be formed by connecting steel girders 20' having a longer abdomen height toward both ends.

In the description of the second embodiment of the present invention, the structure of the joint of the main reinforcing bar 61 and the vertical reinforcing bar 71, that is, the double joint structure having a sufficient joint length in the joint, is described in the second embodiment of the present invention. It is apparent from the description of the present specification that the structure of the joint used in the second embodiment of the present invention can be used as a reinforcing bar coupler or a welding joint.

According to the construction method of the composite ramen bridge according to the third embodiment of the present invention, as shown in FIGS. 8A and 8B, the composite girder of the center portion of the configuration of steps 1 to 5 in the above-described first and second embodiments is described. The steel girders at the end and the end are separated and manufactured in a separate step, and are not coupled to each other, as shown in FIGS. 8A and 8B, so as to correspond to the distance between the simple supporting support structures installed on the alternating sides. The simple girder 1 "may be manufactured to synthesize the casing concrete 12 in the steel girder 11a having a long height.

 After the steel girder is manufactured, the casing concrete is synthesized only in a certain section of the center, and the casing concrete is not synthesized in the section of the end, and all other work processes are the same as in the first and second embodiments. Since it is similar, detailed description thereof is omitted.

In the above, the preferred embodiments of the present invention have been described by way of example, but the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

1A to 1F illustrate a sequential configuration according to a construction method of a synthetic ramen bridge according to a first embodiment of the present invention.

Figure 2 is an enlarged view showing an enlarged configuration of a state in which the concrete to be ramenized in the 'A' portion of Figure 1e

FIG. 3 is an enlarged view showing another configuration of a state in which a concrete to be ramenized in a portion 'A' of FIG.

4 is an enlarged perspective view showing a configuration before concrete is poured into portion 'A' of FIG. 1E;

5 is a perspective view showing the configuration of the rebar coupler used in FIG.

6A to 6F illustrate a sequential configuration according to the construction method of the composite ramen bridge according to the second embodiment of the present invention.

FIG. 7A is a view showing a state in which a simple girder is mounted on an alternating upper part, which is applicable to both ends, where the height of the abdomen becomes larger as it approaches both ends; FIG.

FIG. 7B is a view showing a state in which a simple girder is mounted on an upper portion of the abdomen as the height of the abdomen increases as both ends thereof are applicable to the second embodiment of the present invention; FIG.

8A is a view showing a process of manufacturing a simple girder according to the third embodiment of the present invention by the method of the first embodiment;

8B is a view showing a process of manufacturing a simple girder according to the third embodiment of the present invention by the method of the second embodiment;

9A and 9B show the configuration of a conventional ramen bridge.

10A and 10B show the structure of another conventional ramen bridge.

** Description of symbols for the main parts of the drawing **

1: Simple girder 10: Center composite girder

20: steel girder at the end 12: casing concrete

40: steel for simple support 61: cast steel for connection

62: lower flange cast steel 66: temporary pier

70: shift 71: vertical rebar for connection

72: vertical rebar for simple burial

Claims (14)

A manufacturing step of the central composite girder for synthesizing the casing concrete around the lower flange of the steel girder; Introducing a compressive stress into the casing concrete by pulling a tension material pre-installed in the casing concrete of the central composite girder; Manufacturing a simple girder by connecting a steel girder, to which no casing concrete is synthesized, by welding or bolting at both ends of the central composite girder in the axial direction; Simply mounting the simple girders at both ends such that both ends of the simple girders are positioned on a simple support base installed on an upper portion of a shift previously constructed so that a plurality of vertical reinforcing bars protrude upwards; The lap joint method of connecting a plurality of the main reinforcing bars to be passed through the outer edge of the upper edge of both ends of the simple girder with a plurality of vertical reinforcing bars protruding above the alternating, overlapping adjacently arranged longer than a predetermined length A reinforcing bar connecting the vertical reinforcing bars and the main reinforcing bars in an excluded manner; Integrating the simple girder and the shift by simultaneously pouring concrete forming the alternating top and bottom plate concrete while covering the exposed steel of the simple girder; Construction method of synthetic ramen bridge, including. The method of claim 1, wherein the reinforcing bar connection step, Male threads formed in different directions at the connecting end portions of the vertical reinforcing bars and the main reinforcing bars are fastened and coupled to female threads formed at both ends of the rebar coupler, and the rebar coupler is rotated while the male threads and the female threads are fastened. The construction method of the composite ramen bridge, characterized in that the vertical reinforcing bar and the main reinforcing bars are bonded to each other. The method of claim 1, wherein the reinforcing bar connection step, The construction method of the composite ramen bridge, characterized by welding the connecting end of the vertical reinforcing bar and the main reinforcing bar. Preparing a steel girder having a length corresponding to the distance between the support bases installed alternately; Synthesizing the casing concrete around the lower flange of the steel girder, the casing concrete to produce a simple girder by synthesizing with the steel girder only a certain section of the center; Introducing a compressive stress into the casing concrete by pulling a tension material pre-installed in the casing concrete of the simple girder; Simply mounting the simple girders at both ends such that both ends of the simple girders are positioned on a simple support base installed on an upper portion of a shift previously constructed so that a plurality of vertical reinforcing bars protrude upwards; The lap joint method of connecting a plurality of the main reinforcing bars to be passed through the outer edge of the upper edge of both ends of the simple girder with a plurality of vertical reinforcing bars protruding above the alternating, overlapping adjacently arranged longer than a predetermined length A reinforcing bar connecting the vertical reinforcing bars and the main reinforcing bars in an excluded manner; Integrating the simple girder and the shift by simultaneously pouring concrete forming the alternating top and bottom plate concrete while covering the exposed steel of the simple girder; Construction method of synthetic ramen bridge, including. The method of claim 4, wherein the reinforcing bar connection step, Male threads formed in different directions at the connecting end portions of the vertical reinforcing bars and the main reinforcing bars are fastened and coupled to female threads formed at both ends of the rebar coupler, and the rebar coupler is rotated while the male threads and the female threads are fastened. The construction method of the composite ramen bridge, characterized in that the vertical reinforcing bar and the main reinforcing bars are bonded to each other. The method of claim 4, wherein the reinforcing bar connection step, The construction method of the composite ramen bridge, characterized by welding the connecting end of the vertical reinforcing bar and the main reinforcing bar. The method according to any one of claims 1 to 6, The casing concrete is a composite ramen bridge construction method, characterized in that the stress due to its own weight is synthesized so that all the steel girders. The method according to any one of claims 1 to 6, The simple support base for supporting the simple girder is a construction method of the composite ramen bridge, characterized in that consisting of a cylindrical steel pipe partially buried in the upper portion of the alternating surface so that the curved surface exposed to the outside facing the axial direction. The method according to any one of claims 1 to 6, The simple support base for supporting the simple girder is composed of a synthetic ramen bridge, characterized in that the elastic flange for accommodating the rotational displacement on the pre-embedded pedestal to the upper part of the upper flange and the abdomen is exposed to interpose. Construction method. A manufacturing step of the central composite girder for synthesizing the casing concrete around the lower flange of the steel girder; Introducing a compressive stress into the casing concrete by pulling a tension material pre-installed in the casing concrete of the central composite girder; A simple girder fabrication step of connecting both ends of the steel girder and the end of the central composite girder formed of only steel materials not synthesized with the casing concrete with welding or bolts in the axial direction; Simply mounting the simple girder on a temporary pier adjacent to the alternate so as to secure a space in the vertical direction between an end of the simple girder and an upper portion of the previously constructed shift; Connecting the main reinforcing bars which are arranged outside the end of the simple girder with vertically reinforcing bars that partially protrude from the upper part of the shift; Integrating the simple girder and the shift by simultaneously placing concrete which forms an alternating top and bottom plate concrete while wrapping the exposed steel of the simple girder; Removing the temporary pier adjacent to the shift; Construction method of synthetic ramen bridge, including. Preparing a steel girder having a length corresponding to the distance between the shifts; Synthesizing the casing concrete around the lower flange of the steel girder, the casing concrete to produce a simple girder by synthesizing with the steel girder only in a certain section of the center; Introducing a compressive stress into the casing concrete by pulling the tension material pre-installed in the casing concrete of the simple girder; Simply mounting the simple girder on a temporary pier adjacent to the alternate so as to secure a space in the vertical direction between an end of the simple girder and an upper portion of the previously constructed shift; Connecting the main reinforcing bars which are arranged outside the end of the simple girder with vertically reinforcing bars that partially protrude from the upper part of the shift; Integrating the simple girder and the shift by simultaneously placing concrete which forms an alternating top and bottom plate concrete while wrapping the exposed steel of the simple girder; Removing the temporary pier adjacent to the shift; Construction method of synthetic ramen bridge, including. The method according to any one of claims 10 to 11, The casing concrete is a composite ramen bridge construction method, characterized in that the stress due to its own weight is synthesized so that all the steel girders. The method according to any one of claims 1 to 6 or 10 or 11, The simple girder construction method of the composite ramen bridge, characterized in that the height of the abdomen is formed as it approaches the both ends of the simple girder. The method according to any one of claims 1 to 3 or 10, In the manufacturing step of the central composite girder, the casing concrete is not synthesized in the area of 0.3m to 1.0m from the end of the central composite girder construction method of the composite ramen bridge.

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