KR101241401B1 - Composite steel continuous bridge construction method using concrete cross beams - Google Patents

Abstract

The present invention relates to a method of constructing a continuous composite bridge using a concrete crossbeam that continuous multi-span bridges without connecting girders by using primary and secondary concrete crossbeams at a point portion, and a bridge support portion at a point portion of a shift or a pier. A primary concrete crossbeam and a secondary concrete crossbeam are installed on top of the reinforcing plate for installation, and the connecting end of the girder is embedded in the inside of the secondary concrete crossbeam, and the secondary concrete crossbeam and the bottom plate concrete are simultaneously cast and integrally As it is formed, the bridge is continuous by the composite behavior of the concrete crossbeam and the girder without connecting the girders.

Description

Construction method of steel composite continuous bridge using concrete crossbeams {COMPOSITE STEEL CONTINUOUS BRIDGE CONSTRUCTION METHOD USING CONCRETE CROSS BEAMS}

The present invention relates to a method of constructing a steel composite continuous bridge using steel girders, and more specifically, by using primary and secondary concrete crossbeams at a point portion, a method of continually multi-span bridges without connection of girder, The present invention relates to a method for constructing a steel composite continuous bridge using concrete crossbeams that does not require or minimize spot time.

New roads and railroads need to be established due to the recent increase in traffic demand, such as the expansion of automobiles.

These new roads or railroads will be installed across existing roads and railroad facilities or rivers, and bridges due to the construction of new bridges can improve workability by eliminating and minimizing space.

In particular, it is possible to reduce the lifting weight during construction of the bridge, enabling rapid construction by small-scale equipment, thereby reducing civil complaints and economic feasibility by reducing the surrounding spot space for construction and shortening the required air.

In general multi-span continuous bridges, the pointal moments are larger than the center moments of the spans, so the cross section is used inefficiently. Stress acts as a deterioration factor of cracking and the like in the point deck concrete.

In the existing method, the bridge support part, which is the main maintenance item in the bridge, is installed in each girder, and thus maintainability by multiple supports is reduced. The use of the bridge is minimized or excluded by using concrete cross beams. It is necessary to establish a plan to improve the maintainability.

In addition, in the bridge structure, the steel composite bridge type is lighter in weight and easier to construct than the concrete bridge type, and the air is short, but the economical efficiency of the expensive steel is generally reduced. When used as a cast steel, significant economic increase can be achieved.

1A and 1B show a conventional rigid composite continuous bridge 10.

The conventional rigid composite continuous bridge 10, first, the construction of the bridge 20 and the alternating 22, and by placing the girder 30 between the bridge 20 and the alternating 22 using the bridge support. To connect, the bottom plate concrete 40 is poured by construction.

Since the conventional steel composite continuous bridge 10 is a girder 30 is usually steel, they are connected to each other using a backing plate and bolts / nuts, or as shown in FIG. It mounts using (50) and connects the back plate 60 by the fillet welding 62 in the connection end of the girder 30. As shown in FIG.

However, in the conventional rigid composite bridge 10, the moment of connecting the girders 30 to each other, bending moments are largely generated at the same point as the bridge 20.

Normally, the cross section of the girder 30 is designed based on such bending parent moment, because it is necessary to manufacture the girder 30 that can withstand the largest load, and when the girder 30 is manufactured with the same end cross section, it is excessive. It becomes a design.

That is, the bending constant moment is generated in the middle portion of the girder 30. Since the size of the bending constant moment is smaller than the bending portion, the cross section of the middle portion of the girder 30 has a problem of being excessively designed. .

The overall modeling of the conventional rigid composite continuous bridge 10 is shown in FIG. 3.

The first step for the overall modeling of the conventional rigid composite bridge 10 is to connect the girder at the same point portion 70, such as the piers 20, and to continually connect, and then pour the bottom plate concrete 40 The bottom plate concrete load acts on the 30 to generate a large bending moment.

The second step for the overall modeling is to synthesize the girder 30, install curbs, railings and pavements, and then model dead loads. The third step is to model live loads after the girder 30 is synthesized. The furnace is modeled by considering temperature change, point settlement, seismic load and wind load.

On the other hand, Figure 2b shows a conventional continuous bridge 80 using a cross-beam. The horizontal crossbeam 82 is made of a precast product and installed on the girder 30 at the same point portion 70 as the pier 20, and both steel girders 30 are connected to each other through the tension member 90. .

However, the process is very troublesome to connect the girders 30 to each other as the tension member 90 in the conventional continuous bridge 80 as described above, and the construction process can be referred to as unproductive.

The present invention is to solve the conventional problems as described above, the purpose of the bridge construction for the construction of the bridge, cross-crossing bridges crossing the railway, roads, rivers, etc. It can be excluded or minimized, and it can be installed by small-scale equipment by reducing the lifting weight for construction, and improved concrete crossbeams to improve economic efficiency and resolution of civil complaints by reducing surrounding space for construction and shortening of air. The present invention provides a method for constructing a steel composite bridge.

In addition, another object of the present invention is to reduce the parent moment generated in the multi-span continuous structure by improving the construction method to improve the efficiency of the bridge section by the balanced distribution of the cross-sectional force and to bridge bridge concrete crack suppression by reducing the cracks It is to provide a method of constructing a continuous composite bridge using concrete crossbeams, which greatly improves the efficiency of the steel bridge and improves economic efficiency in the steel composite bridge and minimizes the number of bearings.

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According to an aspect of the present invention,

After installing the reinforcement plate for bridge support installation on the upper part of the branch, install the primary concrete cross beam reinforcement and girder support frame;

Primary casting and curing of concrete to a position lower than the lower surface of the girder so that the composite action of the concrete crossbeam and the girder is smooth;

A prefabricated girder is mounted on a girder frame of concrete crossbeam;

Supporting the mounted girders to install bottom plate casting clubs and secondary formwork;

After the secondary concrete cross beam reinforcement and the bottom plate reinforcement, the secondary concrete cross beam and the bottom plate concrete are poured at the same time to cure; And

After completion of curing of the bottom plate, and providing a protective wall and railing; and provides a method of constructing a continuous composite bridge using a concrete crossbeam characterized in that the bridge is continuous by the composite behavior with the concrete crossbeam without connecting the girder. .

In addition, the present invention is preferably the step of installing the girder by installing a finishing plate at the end of the girder in consideration of the composite action and the stress behavior with the concrete crossbeam, by drilling a stud and reinforcement holes in the installed finishing plate and girder It provides a method of constructing a steel composite continuous bridge using concrete crossbeams to install manufactured girders.

And the present invention is preferably the step of installing the bottom plate pour copper and secondary formwork to support the bottom plate concrete pours and formwork to the girder, the girder weight and the bottom plate concrete and formwork and the club load At the same time, it provides a method of constructing a steel composite continuous bridge using concrete crossbeams installed to support girders.

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According to the present invention, the multi-span structure can be realized in a continuous structure by the composite action of the concrete cross beam and the girder without connecting the girder during the construction of the rigid composite bridge.

Therefore, girder joint work is unnecessary on the job site, so no professional manpower is required, and the economic efficiency and durability of the bridge are greatly improved by improving the section efficiency through the distribution of the parent section section force and reducing the cracks in the bottom plate due to the reduced parent section. Can be promoted.

In addition, according to the present invention, the first concrete cross beam is first installed on the upper part of the bridge piers, and both ends of the girder are mounted but not connected to each other, so that bending moments are not generated during the construction. There is no need to do it. In addition, the bridge is completed by placing the bottom concrete and the secondary concrete beam on the upper part of the first concrete crossbeam.In this process, when the girder, the concrete crossbeam, and the bottom plate concrete are integrated, the girder is connected to each other, so that bending bending moment is generated. Since the girder, the cross beam, and the bottom plate concrete are resisted by the composite section integrated with the bending parent moment, the cross section of the girder can be remarkably reduced.

In addition, according to the present invention, it is possible to use the existing section steel products as girder, which can reduce the material cost and manufacturing cost, increase the speed and economic feasibility of the construction, reduce the number of supporting bases for supporting the superstructure due to the installation of concrete crossbeams and raise the bridges. Maintaining the jack-up space for the bridge greatly improves the maintainability of the bridge bearing.

And one of the greatest advantages of applying the method of the present invention is that when the concrete cross beam and the column integrally can remove the bridge support and can also reduce the number. The reason is that it is not installed directly on the bridge support, but installed on the concrete cross beam, and if the bridge support is reduced in this way, it is possible to reduce the maintenance costs and increase the convenience of maintenance and increase the convenience of the bridge maintenance.

In addition, according to the present invention, it is possible to reduce the lifting construction weight, so that the use of small-scale equipment is possible. You can get it.

1A is a front sectional view showing a steel composite continuous bridge according to the related art.
Figure 1b is a side cross-sectional view showing a rigid composite bridge according to the prior art.
Figure 2a is a side cross-sectional view and a front sectional view showing a structure in which the girder is connected by using an additional plate and fillet welding in a steel composite continuous bridge according to the prior art.
It is explanatory drawing which shows the continuous bridge using the conventional horizontal crossbeam.
FIG. 3 is an explanatory diagram showing the overall system modeling for the steel composite continuous bridge according to the prior art step by step.
Figure 4a is a front sectional view showing a steel composite continuous bridge using a concrete crossbeam according to the present invention.
Figure 4b is a side cross-sectional view showing a steel composite continuous bridge using a concrete crossbeam according to the present invention.
5A is a side cross-sectional view illustrating a structure in which girders are synthesized using a concrete cross beam at a point portion of a steel composite continuous bridge using a concrete cross beam according to the present invention.
5B is a sectional view showing a bridge structure directly installed on a pier or alternating girder at a point of a steel composite continuous bridge using a concrete crossbeam according to the present invention, without using a bridge support.
Figure 6a is an explanatory diagram showing the overall system modeling for the steel composite continuous bridge using a concrete crossbeam in accordance with the present invention step by step.
6B is an explanatory view showing the compressive and tensile stresses generated in the static moment section and the parent moment section of the steel composite continuous bridge using the concrete crossbeam according to the present invention in comparison with the conventional steel composite continuous bridge structure.
Figure 7 is a flow chart illustrating a step-by-step method of constructing a steel composite continuous bridge using a concrete crossbeam according to the present invention.
8A is an explanatory diagram illustrating a step of installing a primary concrete cross beam reinforcement and a girder support frame after buying a reinforcement plate for installing a bridge support on an upper surface of a branch according to the present invention.
8B is an explanatory view showing the steps of primary casting and curing concrete to a position slightly lower than the lower surface of the girder according to the present invention.
Figure 8c is an explanatory diagram showing the step of mounting the girder prepared in accordance with the present invention to the girder support frame of the concrete transverse compensation.
Figure 9a is an explanatory view showing the step of installing the bottom plate cast copper and secondary formwork as a support for the girder mounted in accordance with the present invention.
Figure 9b is an explanatory diagram showing the step of curing by pouring the secondary concrete crossbeam and the bottom plate concrete simultaneously in accordance with the present invention.
Figure 9c is an explanatory diagram showing a step of installing a protective wall, railings, etc. after completion of curing the bottom plate according to the present invention.

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

As shown in FIGS. 4A and 4B, the steel composite continuous bridge 100 using the concrete crossbeam according to the present invention is a bridge with the composite behavior of the concrete crossbeam 150 and the girder 110 without direct connection between the girder 110. Is a sequential sequence.

The steel composite continuous bridge 100 using the concrete cross beam according to the present invention is installed on the top of the reinforcement plate 140 for installing the bridge support at the point portion 130 of the bridge 120 or the shift 122, the concrete cross beam 150 is installed. The interior of the concrete crossbeam 150 is a structure in which the connecting end of the girder 110 is embedded in the composite connection, such a concrete crossbeam 150 is a primary concrete crossbeam 150a for supporting the girder 110. And, it is synthesized to the girder 110 to connect the girder 110, at the same time the bottom plate concrete 160 of the top of the girder 110 is made of a concrete concrete cross beam 150b formed integrally.

That is, the concrete cross beam 150 is the first concrete cross beam reinforcement after installing the reinforcing plate 140 for installing the bridge support portion at the point portion 130 of the bridge 120 or shift 122, as shown in Figure 5a Install the reinforcement 152 and the girder support frame 154, and includes the primary concrete crossbeam 150a for primary casting and curing of concrete to a position slightly lower than the lower surface of the girder 110 installed on the girder support frame 154. do.

The first concrete cross beam 150a is formed on the bridge reinforcement plate 140 at the top of the bridge portion 120 or the bridge portion 122 of the bridge 122, the first concrete cross beam reinforcement 152 And a primary formwork (not shown) around the girder support frame 154, and the concrete to a height lower than 5-15 cm lower than the lower surface of the girder 110 to be mounted on the girder support frame 154 on the primary concrete crossbeam 150a. As the first construction, preferably a little lower than the lower surface of the girder 110, the concrete crossbeam 150 is to be mounted, it is constructed to about 10cm.

The concrete cross beam 150 is mounted on the girder 110 on the primary concrete cross beam 150a on the girder support frame 154 on the primary concrete cross beam 150a and supports the girder 110 as a support. After installing the base plate copper 172 and the secondary formwork (174), and after the secondary concrete cross beam reinforcement (176) and the bottom plate reinforcement (not shown), and poured at the same time with the bottom plate concrete (160) Cured secondary concrete crossbeam 150b is included.

Such secondary concrete cross beam 150b is to install the girder 110 manufactured in consideration of the camber in the manufacturing site in advance integrally embedded on the girder support frame 154, the girder 110 is finished at its end A plurality of studs 114 and reinforcing bar reinforcing holes (not shown) in the girder 110 and the finishing plate 112 so as to weld the plate 112 and resist adhesion to the concrete crossbeam 150 and the required cross-sectional force. ) As perforated, such end of the girder 110 is first mounted on the first concrete cross beam 150a.

Then, the reinforcement 176 of the secondary concrete crossbeam 150b is made, and when the reinforcement 176 of the secondary concrete crossbeam 150b is in contact with the girder 110, the perforated portion of the girder 110 is drilled. Through the hall (not shown), you will be in close proximity.

In addition, the mounted girders 110 as a support for installing the base plate copper plate 172 and the secondary formwork 174, and then the secondary concrete cross beam reinforcement 176 and bottom plate reinforcement (not shown) Afterwards, the secondary concrete crossbeam 150b and the bottom plate concrete 160 are poured and built at the same time.

As such, when the secondary concrete crossbeam 150b and the bottom plate concrete 160 are cured at the same time, the parents of the inner point 130 are not generated due to the weight of the bottom plate concrete 160 and the weight of the girder 110. .

In addition, after placing the concrete slab 160 and curing, the protective wall and the railing 180, etc. will be installed. In this case, after dismantling the floor slab formwork and copper bar 172, the protective wall and railing 180 At the same time, the bridge is completed by installing new joints, bridge support (P), and pavement.

On the other hand, the steel composite continuous bridge 100 using the concrete crossbeam according to the present invention, as shown in Figure 5b, the girder 110 is directly installed on the point portion 130 of the pier 120 or alternating 122 It is also applicable to bridge structures.

In such a structure, the primary concrete cross beam reinforcement 152 is directly installed without installing the bridge support part P or the reinforcement plate 140 for installing the bridge support part at the point portion 130 of the bridge 120 or the bridge 122. ) And the girder support frame 154 is installed.

That is, the concrete cross beam 150 is installed at the point portion 130 of the pier 120 or the shift 122, the primary concrete cross beam reinforcement and girder support frame, a little than the lower surface of the girder 110 is installed on the girder support frame It includes a primary concrete crossbeam 150a to pour and cure concrete to a low position.

Such a primary concrete crossbeam 150a is the first construction of concrete to a height of 5 to 15cm lower than the lower surface of the girder 110 to be mounted on its upper portion, preferably the concrete crossbeam 150 is mounted on the girder 110 It is constructed up to about 10cm in height slightly lower than the lower surface.

And the girder 110 is mounted on the girder support frame on the concrete crossbeam 150 from the upper portion of the primary concrete crossbeam 150a, and the bottom plate placing copper bar and secondary formwork are installed by supporting the girder 110 as a support. Next, after the secondary concrete cross beam reinforcement and the bottom plate reinforcement, the secondary concrete cross beam (150b) was formed by placing and curing at the same time with the bottom plate concrete 160.

The steel composite continuous bridge (100) using the concrete cross beam of such a structure is also cured by pouring the secondary concrete cross beam (150b) and the bottom plate concrete (160) at the same time, resulting from the bottom plate concrete (160) self-weight and the girder (110) self-weight. The parent of the internal point portion 130 is not generated.

In addition, after placing and curing curing of the bottom plate concrete 160, the formwork and copper bar for placing the bottom plate are dismantled, and a barrier and handrail 180 are installed, and at the same time, the bridge is completed by performing expansion joints and road pavement. Done.

The steel composite continuous bridge 100 using the concrete cross beam according to the present invention configured as described above is mounted on the girder 110 separated from each other on the primary concrete cross beam 150a, and the bottom plate concrete 160 load and the girder 110. The concrete is placed and cured by applying a load at the same time, and at the same time as the bottom plate concrete 160 is placed, the internal point portion 130 is absorbed by displacement so that no cross-sectional force is generated and only a bending moment is generated in the girder 110 only. do.

The steel composite continuous bridge 100 using the concrete crossbeam according to the present invention is different from the conventional steel composite continuous bridge 10 as shown in FIG. It is done through

First, the first step is to model the first concrete cross beam 150a pours and the girder 110 load in the state that the girder 110 is separated from each other, the second step is the girder 110 by the secondary concrete cross beam 150b The secondary concrete cross beam 150b and the bottom plate concrete 160 dead weight are modeled in the state before synthesis.

The third step is after the synthesis of the girder 110 by the secondary concrete crossbeam 150b, install curbstone, railing 180 and road pavement, and then model dead load, and the fourth step is the secondary concrete crossbeam 150b. After the synthesis of the girder 110 by, the live load is modeled, and in five steps modeling in consideration of the temperature change, point settlement, earthquake load and wind load.

As described above, the steel composite continuous bridge 100 using the concrete crossbeam according to the present invention has a stress between upper and lower flanges of the girder 110 in the constant moment section and the parent section section of the girder 110, as shown in FIG. 6B. The car can be greatly reduced.

That is, when the steel composite continuous bridge 100 using the concrete crossbeam according to the present invention is constructed as described above, the compressive stress is increased in the constant moment section, the tensile stress is reduced compared to the conventional steel composite continuous bridge 10 On the contrary, compressive stress decreases and tensile stress increases in parent section.

The structural cross section obtained from the steel composite continuous bridge 100 using the concrete crossbeam according to the present invention finally, the girder 110, the concrete crossbeam 150, the bottom plate concrete 160 is integrated to behave as a composite cross section.

The cross section of the conventional rigid composite bridge 10 determines the cross section of the internal point portion 70 by the cross-sectional force of the point portion 70 of the parent moment maximum, the difference in the thickness change between the cross section of the central section with the largest positive moment When the stress level of the point portion 70 is determined at the 95% line, the cross section is determined at the stress level of about 75%.

In addition, since the conventional rigid composite bridge 10 constructs the girder 30 first and then constructs the bottom plate concrete 40, the bottom plate concrete 40 load is generated as a parent of the inner point part 70. This is when the pre-stress is not introduced to the bottom plate concrete 40, excessive reinforcement is required in the bottom plate and because the cracking conditions due to the characteristics of the reinforced concrete causes the bottom plate durability degradation factors.

However, the steel composite continuous bridge 100 using the concrete cross beam according to the present invention, unlike the previous composite steel continuous bridge 10, the bottom plate concrete 160 load is cast and cured without curing bending moment does not occur Only positive moment occurs.

This is because the bending parent at the point portion 130, as the girder 110 is connected, the structure is continuously connected at the point portion 130, or the bottom portion 130, such as placing the bottom plate concrete 160 It can be seen that occurs when forming a continuous.

Therefore, based on the girder 110, the bending parent moment is cured after the curing of the bottom plate concrete 160, and is combined with the girder 110 to generate the bending parent moment only by the secondary dead load of the firewall load, the paving load, and the live load. .

Since the approximate total transfer load of the girders 110 (the bottom plate concrete 160 load) / total load ≒ 0.5, the cross section force of the parent section section can be greatly reduced even if the sole plate concrete 160 load does not generate the bending parent moment. do.

Therefore, considering only the girder 110, the upper and lower stress distribution state is changed in an even direction, which may be a more important strength when using the steel.

That is, since the upper and lower flanges have the same thickness, the upper and lower portions of the upper and lower flanges have the same compressive stress, and the lower portion generates tensile stress and the opposite portion occurs in the branch portion 130.

At this time, the rigid composite bridge 100 using the concrete crossbeam according to the present invention is the bending girders at the point portion 130 after the girder 110, the concrete crossbeam 150, the bottom plate concrete 160 are synthesized with each other Since the upper and lower portions of the girder 110 until the completion of the slab of the bridge, the compression and the tensile stress are generated evenly, so that the overall cross-sectional force of the girder 110 can be greatly reduced.

Hereinafter, a method of constructing a continuous composite bridge 200 using a concrete crossbeam according to the present invention will be described in more detail with reference to the accompanying drawings.

Steel composite continuous bridge construction method 200 using the concrete cross beam according to the present invention first, as shown in Figure 7, the bridge bearing on the upper surface of the point portion 130 including the bridge 120 and the shift 122 After purchasing the secondary installation reinforcing plate 140, a step (S1) of installing the primary concrete cross beam reinforcement 152 and the girder support frame 154 is made.

This step (S1) is, as shown in Figure 8a, after the bridge reinforcement plate for installing the bridge support portion 140 to the upper surface of the point portion 130 of the bridge 120 or the shift 122, and thereafter 1 Car concrete cross beam reinforcement 152 and the girder support frame 154 will be installed.

Meanwhile, as shown in FIG. 5B in the step S1, in the bridge structure in which the girder 110 is directly installed at the point portion 130 of the bridge 120 or the bridge 122, such a bridge support part is installed. Without installing the reinforcing plate 140, the primary concrete cross beam reinforcement 152 and the girder support frame 154 can be installed directly on the point portion 130 of the pier 120 or alternating 122.

Then, the first step of placing and curing concrete to a position slightly lower than the lower surface of the girder 110 so that the composite action of the concrete crossbeam 150 and the girder 110 is made (S2).

This step (S2), as shown in Figure 8b, the first concrete cross beam reinforcement 152 at the top of the reinforcement plate 140 for the bridge support portion installation at the point portion 130 of the bridge 120 or shift 122 ) And the primary formwork (not shown) around the girder support frame 154, and the first construction of concrete to a height of 5 ~ 15cm lower than the lower surface of the girder 110, preferably in the girder support frame 154 A little lower than the bottom of the girder 110 to be mounted, the construction will be up to about 10cm.

In addition, the next step (S3) is made to mount the girder 110 prepared in advance on the girder support frame 154 on the concrete crossbeam 150.

This step (S3) is, as shown in Figure 8c, in advance to install the girder 110 made on the girder support frame 154 in consideration of the camber at the manufacturing site, the end of the girder 110 is finished A stud 114 and a reinforcing bar hole (not shown) are formed in the girder 110 and the finishing plate 112 to weld the plate 112 and resist adhesion to the concrete crossbeam 150 and the required cross-sectional force. A step of mounting the end of the girder 110 manufactured by drilling on the first concrete cross beam 150a that was first placed (see FIG. 5A).

And the reinforcement 176 of the secondary concrete crossbeam 150b is made, when the reinforcement 176 of the secondary concrete crossbeam 150b, the contact portion with the girder 110 is perforated of the girder 110. Through the hall (not shown), you will be in close proximity.

In addition, the step (S4) is made to install the bottom plate cast copper 172 and the secondary formwork 174 by supporting the mounted girders 110.

Step (S4) to install the bottom plate pour copper 172 and the secondary formwork 174, as shown in Figure 9a, the bottom plate concrete 160 pour copper 172 and the formwork (174) It is installed to support the girder 110, and the girder 110 is installed to support the weight of the girder 110 and the bottom plate concrete 160 and the formwork (not shown) and the club 172 at the same time.

Next, after the bottom plate reinforcement (not shown), a step (S5) is made by pouring the secondary concrete crossbeam 150b and the bottom plate concrete 160 at the same time.

This step (S5), as shown in Figure 9b, after performing the bottom plate concrete 160 reinforcement (not shown) in the bottom plate pouring form (not shown) supported on the girder 110, The secondary concrete crossbeam 150b, that is, the remnant and the bottom plate concrete 160 are cured at the same time, so that the parents of the inner point 130 are not generated by the self weight of the bottom plate concrete 160 and the self weight of the girder 110. It will be constructed.

In addition, after the bottom plate concrete 160 is placed and cured as described above, a step (S6) is performed to install a protective wall and a railing 180, and the like (S6) is shown in FIG. 9C. Likewise, after dismantling the bottom plate formwork and copper bar 172, to install the protective wall and railing 180, and at the same time to perform the expansion joint and bridge support (P), pavement to complete the bridge .

Here, the bridge support portion (P) may be installed in place of the bridge reinforcement plate 140 for installing the bridge support in a conventional manner.

The steel composite continuous bridge 100 and the construction method 200 using the concrete cross beam according to the present invention as described above, the concrete crossbeam 150 and the girder 110 without a direct connection between the girder 110 during the construction of the composite continuous bridge The multi-span structure can be realized as a continuous structure by the synthesizing action.

Therefore, it is not necessary to directly joint work of the girder 110 at the work site, and no professional manpower is needed, and the efficiency of the section through the distribution of the parental section force is improved, and the bottom plate crack of the branch part 130 is reduced due to the reduced parental force. Reduction can greatly increase the economics and durability of the bridge.

And the present invention is first installed the first concrete cross beam 150a on the pier 120 or the shift 122, the branch portion 130, and to mount both ends of the girder 110 on the girder support frame 154 By not being connected to each other, the bending portion does not occur in the point portion 130 during the construction process, it is not necessary to design a large cross section.

In addition, the bottom plate concrete 160 and the secondary concrete crossbeam 150b is placed at the same time on the top of the first concrete crossbeam 150a to complete the bridge. In this process, the girder 110, the concrete crossbeam 150, and the floor When the plate concrete 160 is integrated, the girder 110 is connected to each other, so that bending bending moments are generated. However, the girder 110, the concrete crossbeam 150, and the bottom plate concrete 160 are integrated with the bending bending moment. Since the resistance to the cross section is obtained an excellent effect that can significantly reduce the cross section of the girder (110).

And since the present invention can use the existing section steel products as girder 110, can reduce the material cost and manufacturing cost, it is possible to increase the speed and economic feasibility of the construction, required for supporting the superstructure due to the installation of concrete crossbeam 150 Maintainability of bridge bearings is greatly improved by reducing the number of bearings and securing jack-up space for raising the bridges.

In addition, one of the greatest advantages of applying the method of the present invention, as shown in Figure 5b, when the concrete cross beam 150 and the pillar, that is, the bridge 120 or alternating 122, the bridge support ( P) can be eliminated and the number can be reduced.

The reason is that the girder 110 is not installed directly on the bridge support portion P, but is installed on the girder support frame 154 through the concrete cross beam 150, and thus, when the bridge support portion P is reduced, the bridge In addition to the reduction of maintenance targets, maintenance costs and convenience can be greatly improved.

In addition, the present invention can reduce the cross section of the girder (110), can reduce the lifting weight, it is possible to use the small-scale equipment, the space utilization of the lower surface of the bridge during construction and the reduction of the occupied space around the construction site and construction A shorter period of time will also lead to a better effect of reducing complaints.

An embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications are within the scope of the present invention as long as they are obvious to those skilled in the art.

10 ...... Conventional steel composite continuous bridge
20 ...... Pier 22 ...... Shift
30 ...... Girder 40 ...... Slab Concrete
50 ...... Bridge Support 60 ...... Saddle Plate
62 ...... Fillet welding 70 ......
80 ...... A conventional continuous bridge using lateral crossbeams 82 ......
90 ...... Tension material 100 ..... Steel composite bridge using concrete crossbeams
110 ..... Girder 120 ...... Pier
122 ..... shift 130 ...... branch office
140 ..... Reinforcement plate 150 ...... Concrete crossbeam
150a .... 1st concrete crossbeam 150b ..... 2nd concrete crossbeam
152 ..... 1st concrete crossbeam reinforcement 154 ..... girder support
160 ..... Sole concrete 172 ...... Sole casting
174 ..... Secondary formwork 176 ...... Secondary concrete crossbeam reinforcement
180 ..... Firewalls and Railings P ...... Bridge Supports
200 ..... Construction method of steel composite bridge using concrete crossbeam
S1 ...... After installing the reinforcement plate for installing the bridge support on the upper part of the branch, installing the first concrete cross beam reinforcement and the girder support frame
S2 ...... Primary casting and curing of concrete to lower position than under girder
S3 ...... Mounting the prefabricated girder to the girders of concrete crossbeam
S4 ...... Step of installing club and secondary formwork with supporting girders
S5 ...... Stage and curing of secondary concrete crossbeams and bottom plate concrete at the same time
S6 ...... After curing the bottom plate, installing the protective wall and railing, etc.

Claims (11)

delete delete delete delete delete After installing the reinforcement plate for bridge support installation on the upper part of the branch, install the primary concrete cross beam reinforcement and girder support frame;
Primary casting and curing of concrete to a position lower than the lower surface of the girder so that the composite action of the concrete crossbeam and the girder is smooth;
A prefabricated girder is mounted on a girder frame of concrete crossbeam;
Supporting the mounted girders to install bottom plate casting clubs and secondary formwork;
After the secondary concrete cross beam reinforcement and the bottom plate reinforcement, the secondary concrete cross beam and the bottom plate concrete are poured at the same time to cure; And
After completion of curing of the bottom plate, the step of installing a barrier and guardrail, etc .; including the continuous continuation of the bridge by the composite behavior with the concrete crossbeam without connecting the girder,
The step of installing the bottom plate casting clubs and secondary formwork is installed by supporting the bottom plate concrete casting clubs and formwork to the girder, and installed to support the weight of the girder and the bottom plate concrete and formwork and girder load at the same time Steel composite continuous bridge construction method using a concrete crossbeam characterized in that. According to claim 6, The step of installing the girder is manufactured by installing a finishing plate at the end of the girder in consideration of the composite action and the stress behavior of the concrete crossbeam, and drilling the studs and reinforcement holes in the installed finishing plate and girder Steel composite continuous bridge construction method using a concrete crossbeam, characterized in that to install a girder. delete delete delete delete

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