KR20040057063A - Continuous Construction of Prestressed Steel Bridge with Double Wed filled Concrete - Google Patents

Abstract

PURPOSE: A continuous coupling structure of prestressed girders of a composite steel bridge having a double web structure filled with concrete is provided to secure the structural stability of a composite steel bridge by welding main girders and connecting prestressing members. CONSTITUTION: The continuous coupling structure of prestressed girders of a composite steel bridge having a double web structure filled with concrete couples prestressed girders(200a,200b) which contain upper and lower plates having the appointed thickness and a connecting member connecting the upper and lower plates vertically. The connecting member contains a pair of thin plates connected at regular intervals to form an inner space, prestressing members(223a,223b) whose both ends are fixed to an anchorage end(226a) fixed to a thin plate at regular intervals to locate between a pair of thin plates, and concrete filled in a space between a pair of thin plates. The prestressed members(223a,223b) are connected by a coupler(240) and welded each other.

Description

Continuous Construction of Prestressed Steel Bridge with Double Wed Filled Concrete}

The present invention relates to a mold of a steel composite bridge, and in particular, to secure the structural stability of the steel composite bridge between the molds of the steel composite bridge bonded to each other in order to continue the mold of the steel composite bridge composed of a composite structure of steel and concrete It relates to a continuous coupling structure.

As shown in FIG. 1, the steel composite bridge 100 is composed of a concrete bottom plate 110 and a mold 120 composed of a steel material supporting the concrete bottom plate 110. The mold 120 is configured by welding three plates 121, 122, and 123 having a predetermined thickness in the form of an I-shaped steel.

The rigid composite bridge 100 configured as described above is configured to increase the compressive stress by increasing the compressive stress by introducing prestress into the mold in order to reinforce the mold 120.

2A and 2B are schematic diagrams each showing a mold of a steel composite bridge incorporating a prestress according to the prior art, and FIG. 2C is a schematic diagram showing a state in which concrete is reinforced in a mold of the steel composite bridge shown in FIG. 2B. .

As shown in FIG. 2A, a prestressing member 130 such as steel rods and tendons is conventionally used to reinforce the mold 120. That is, the prestressing member 130 is mounted on the lower side of the mold 120. The coupling relationship is described in detail as follows.

On the lower surface of the lower plate 123 constituting the lower part of the mold 120, two fixing ends 140 are provided at predetermined intervals along their length direction. The fixing end 140 is configured to fix both end portions of the prestressing member 130, and is configured to fix the prestressing member 130 in such a state when the prestressing member 130 is tensioned with a hydraulic jack. In addition, the prestressing member 130 is supported by the lower plate 123 by a plurality of support ends 150 installed at predetermined intervals along the longitudinal direction. Therefore, when the prestressing member 130 is tensioned at one side or both sides of the fixing end 140, the compressive stress of the mold 120 is increased to increase the load bearing capacity of the mold.

In addition, as shown in FIG. 2B, the prestressing member 130 is conventionally installed on the upper surface of the lower plate 123 constituting the lower part of the mold 120 in the same way as the lower plate 123. By increasing the compressive stress of the mold 120 to increase the load capacity of the mold. In addition, in the related art, the prestressing member 130 is installed on the side of the connecting plate 122 connecting the upper and lower plates 121 and 123 up and down in the same manner as described above.

In addition, as shown in FIG. 2C, as shown in FIG. 2B, the prestressing member 130 fixed to the upper surface of the lower plate 123 or the side of the connecting plate 123 is embedded in the concrete 160 to form the mold 120. ). That is, in the related art, it is reinforced with concrete 160 to prevent buckling of the mold 120 due to the compressive stress of the prestressing member 130.

When the mold 120 is reinforced as described above, the mold 120 is disposed between alternations, piers, or piers, respectively. At this time, the mold 120 is located in the alternating or piers by the pedestal. The mold 120 is disposed so that both ends of the expansion joint is installed, thereby having a stretch force between the alternating or pier and the mold, the mold.

As described above, in order to reinforce the mold, the prestressing member and the concrete must be disposed on the exterior of the mold, so the bridge is not aesthetically pleasing, and the concrete must be poured to prevent the buckling of the mold due to the compressive stress. There is a disadvantage in that the structural stability of the bridge cannot be secured because no pre-stressing necessary by the prestressing member can be introduced into the mold.

In addition, the conventional mold does not have a configuration that is coupled to each other, and because the expansion joints to be installed at both ends of each mold has a disadvantage that a large number of expansion joints are required and its operation is complicated.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, by combining each mold consisting of a composite structure of steel and concrete through the connection of the welding and prestressing member installed therein, The purpose of the present invention is to provide a continuous coupling structure between prestressed molds of a steel composite bridge having a double-clad concrete structure filled with concrete to ensure structural stability of the bridge.

1 is a schematic diagram showing the arrangement relationship between the concrete deck and the mold of a conventional steel composite bridge,

2A and 2B are schematic diagrams each showing a mold of a steel composite bridge incorporating a prestress according to the prior art;

FIG. 2C is a schematic view showing a state in which concrete is reinforced in a mold of the steel composite bridge shown in FIG. 2B;

3A and 3B are cross-sectional and longitudinal cross-sectional views of a mold of a steel composite bridge constructed of a composite structure according to the present invention;

FIG. 4 is a schematic diagram showing a coupling relationship between molds of the rigid composite bridge shown in FIG. 3.

♠ Explanation of symbols on the main parts of the drawing ♠

200, 200a, 200b: mold 210: upper plate

220: connecting member 221, 222: thin plate

223, 233a, 233b: prestressing member 224: concrete

225: stud 226, 226a: settlement

230: lower plate 240: coupler

According to the present invention for achieving the above object, in the coupling structure for coupling the upper and lower plates having a predetermined thickness and the mold of the rigid composite bridge composed of a connecting member for connecting the upper and lower plates up and down, the connecting member Is a pair of thin plates that are connected at regular intervals to form a space therebetween, and both ends are fixed to a fixing end fixed at regular intervals on at least one of the thin plates so as to be located between the pair of thin plates. A prestressing member and concrete filled in a space formed between the pair of thin plates, and the prestressing members of the mold contacting each other are connected to each other by a coupler, and the molds are weld-bonded to each other. Continuous coupling structure between prestressed molds of rigid composite bridges The.

In the following, with reference to the accompanying drawings, a preferred embodiment of the continuous coupling structure between the pre-stressed mold of a steel composite bridge having a double-clad concrete structure filled with concrete according to the present invention will be described in detail.

3A and 3B are cross-sectional and longitudinal cross-sectional views of a mold of a rigid composite bridge constructed of a composite structure in accordance with one embodiment of the present invention.

As shown in FIGS. 3A and 3B, the mold 220 of the composite bridge of the present invention connects the upper and lower plates 210 and 230 having a predetermined thickness and the upper and lower plates 210 and 230 vertically. It is composed of a connecting member 220.

The connecting member 220 is a pair of thin plates (221, 222) are connected at a predetermined interval to form a space therebetween, the prestressing member 223 is provided between the thin plates (221, 222), It consists of concrete 224 filled in the space formed between these thin plates 221 and 222. That is, the connecting member 220 of the present invention forms a double abdominal plate through a pair of thin plates 221 and 222 and fills the concrete 224 therein, thereby having a double abdominal plate structure filled with concrete. In addition, the connecting member 220 is configured to install a stud 225, etc. in the space formed between the thin plates 221, 222 to improve the adhesion performance of the concrete 224 and the thin plates (221, 222). desirable.

The prestressing member 223 is installed between the pair of thin plates 221 and 222, and forms one fixing end 226 at one end portion of one thin plate 221 and the other thin plate 222. One other fixing end is formed at the other end portion of the), and a pair of thin plates 221 and 222 are arranged to be fixed in a zigzag form so that both ends are fixed to the fixing end, respectively.

In addition, the prestressing member 223 forms two fixing ends on at least one thin plate 221 or 222, respectively, and is disposed therebetween, with both ends being fixed to the respective fixing ends. At this time, the prestressing member 223 is fixed to the fixing end to protrude a predetermined portion to both sides of the thin plates (221, 222). The prestressing member 223 disposed as described above is tensioned by the hydraulic jack or the like and fixed to the fixing end. In the present invention, a plurality of prestressing members 223 may be provided between a pair of thin plates 221 and 222 in the same manner as described above.

And, the stud 225 is discontinuously projected fixed to the inner surface of the thin plates (221, 222), serves to improve the adhesion performance of the concrete 224 and the thin plates (221, 222).

When the prestressing member 223 and the stud 225 are installed between the pair of thin plates 221 and 222 as described above, the upper and lower plates 210 and 230 are welded to the upper and lower portions of the thin plates 221 and 222. The result is a "I" shaped template.

In the following, a process of continually connecting the molds 200 of the present invention configured as described above to each other will be described in detail.

In general, the moment acts as the moment at the center between the alternating or pier and the parent moment at the point of contact with the alternating or pier. Therefore, when the mold 200 is continuously installed in alternating and piers, it must have a compressive stress that resists the static moment and the parent moment acting at each point. However, the mold 200 of the present invention is composed of a composite structure of the thin plates 221, 222 and concrete 224 as described above, but since the prestressing member 223 is embedded in the concrete 224 to apply prestress. It can be configured to have a compressive stress resistant to the cement and parent. Therefore, the present invention is configured to have a compressive stress that resists the static moment and the parent moment with respect to the parts in contact with each other to continue the mold 200.

FIG. 4 is a schematic diagram showing a coupling relationship between molds of the rigid composite bridge shown in FIG. 3. As shown in Fig. 4, in order to continually mold the mold of the present invention, a mold having a prestress of a form capable of resisting the constant moment and the parent moment of the point portion (the mold 200a to be positioned in the center portion and the point portion is located). The mold 200b] to be separated and manufactured. Then, in the field, the prestressing members 223a and 223b of the molds 200a and 200b are connected to each other with the coupler 240. That is, the coupler 240 tightens one end of each of the prestressing members 223a and 223b to connect to each other. At this time, the prestressing members 223a and 223b respectively installed in the molds 200a and 200b are not positioned on the same line with each other so that the prestressing members 223a and 223b are connected in a diagonal direction by the coupler 240. It is preferable.

Then, the molds 200a and 200b are weld-bonded with each other, and a portion of the thin plates 221 and 222 is cut and filled with concrete to cure and integrate the space formed between the thin plates 221 and 222 through the cutout to integrate.

Then, the prestressing members 223a and 223b are tensioned at the fixing ends 226a located at both ends of the continuous mold, and the compressive stress resisting the static moment and the parent moment is applied to each of the molds 200a and 200b. The compressive stress is applied to the parts where the molds 200a and 200b are coupled to each other.

When the continuous mold as described above is installed on the alternating or pier, a concrete bottom plate is formed on the upper part of the mold, and after forming the bottom plate, the prestressing member is secondly tensioned to finally complete the rigid composite bridge.

In order to introduce a suitable prestress in the present invention as described above, it is necessary to perform an accurate structural review of the structure to determine the amount of prestress, and also to check the stress transfer performance of the coupler.

As described in detail above, the present invention is to resist each mold in the section compared to the simple beam member of the same condition by sequencing each mold composed of a composite structure of steel and concrete through welding and connecting a prestressing member installed therein. Since the design maximum bending moment can be reduced, the cross section of the mold, the mold height, the amount of use of the material and its own weight can be significantly reduced.

In addition, the present invention does not require expansion joints between molds as the molds are sequential, and only the expansion joints need to be installed at the start and end points of the molds, thus reducing the manpower consumption and work costs required for the design, manufacture and construction of bridges. Not only can a significant reduction, but the safety of the bridge can be increased, and the air shortening can be achieved.

In the above description, the technical details of the continuous coupling structure between the prestress molds of the steel composite bridge having the double-absorbing plate structure filled with concrete of the present invention have been described together with the accompanying drawings, which are illustrative examples of the best embodiments of the present invention. It does not limit the invention.

In addition, it is obvious that any person skilled in the art can make various modifications and imitations within the scope of the appended claims without departing from the scope of the technical idea of the present invention.

Claims (3)

In the coupling structure for coupling the upper and lower plates having a predetermined thickness and the mold of the rigid composite bridge composed of a connecting member for connecting the upper and lower plates up and down, The connecting member is connected to a predetermined distance and a pair of thin plates to form a space therebetween, at least one end of the fixing plate fixed to the at least one of the thin plates so as to be located between the pair of thin plates both ends A prestressing member to which is fixed and concrete filled in a space formed between the pair of thin plates, A continuous coupling structure between prestressed molds of a steel composite bridge having a double-clad concrete structure filled with concrete, wherein the prestressing members of the molds which are in contact with each other are connected to each other by a coupler, and the molds are welded to each other. The continuous coupling structure between prestressed molds of a steel composite bridge having a double-clad concrete structure filled with concrete, characterized in that the connection member further comprises a stud fixed to the inner surface of the thin plate. The prestress of the steel composite bridge according to claim 1 or 2, wherein the prestressing members respectively provided on the molds in contact with each other are connected by the coupler in a diagonal direction. Continuous bonding structure between molds.