KR200279224Y1 - Multi-span continuous Preflex Composite Beam Type Bridge - Google Patents

Abstract

The present invention relates to a multi-span continuous preflex composite bridge, unlike the prior art, in order to completely introduce continuous prestressed compressive stress over each span, as shown in Figures 5 and 6, steel I type girder 2 and the lower flange concrete ( 3) in the combination of 3). Place the strand (4), but One or both ends of the strand 4 are predrawn out of the upper surface of the lower concrete 3 in advance, and the primary prestress compressive stress is introduced into the lower concrete 3, followed by alternation of each span 5 or pier 6 Steel I type girders 2 of two beams 1 longitudinally adjoining each beam 1 independently above each other and on each pier 6 of the inner point, which is the boundary of each span, as shown in FIG. 3. In order to keep the continuity, the upper flange 2a and the abdomen 2b are respectively provided with two layers of the abdominal joint plate 7b and the upper joint plate 7a. The steel I-type girder (2) is exposed to P. In order to assemble each end of the strand 4 through the upper flange 2a of the steel I-type girder 2 so as to cross each other on the upper surface and to be continuous, the P flange 2a and the lower flange 2c are respectively p. . The P. C. strand 4 previously formed with the through hole 14 through which the strand 4 can penetrate and drawn out on the upper surface of the upper flange 2a is a connection fixing device 8 pre-installed on the upper flange plate 7a. ) To assemble so that they can be crossed and intersected with each other by placing the slab concrete 10 and the abdominal concrete 11 and curing them in the connection fixing apparatus 8. It is characterized in that the strand 4 is tensilely fixed.

Description

Multi-span continuous Preflex Composite Beam Type Bridge

The present invention relates to a multi-span continuous preplex composite girder bridge, which will be described in more detail. The concrete and P. C. surrounding the steel I-girder and the lower flange. Combining the strands, P.C. with one end or both ends pre-drawn from the upper surface of the lower flange concrete. The present invention relates to a composite bridge for assembling the stranded wire and allowing the slab concrete and the abdominal concrete to be fixed after being cast and cured.

As shown in FIG. 1, a steel I-type girder 2 is generally a steel material forming a skeleton of a preflex composite beam or a leafrest preplex composite beam 1, and includes a horizontal upper flange 2a and a lower flange 2c. And the abdomen (WEB) 2b integrally formed with each other by welding to form an I-shaped cross section.

When designing a structure such as a conventional bridge using the steel I type girder (2) as described above, designing an economical and safe structure by comprehensively examining the construction method, the stability of the structure, the materials used, and the economics. In principle, construction is done.

Referring to the manufacturing process of the preflex composite beam or leafrest preprex composite beam (1) using the steel I-type girder (2), as shown in (a) (b) (c) (d) of FIG. As shown, first, the steel I-girder 2 is composed of a horizontal upper flange 2a and a lower flange 2c and a vertical abdomen (WEB) 2b. As shown in (a) of FIG. 1, it is manufactured in a slightly curved state, and a load Pf is applied to the steel I-girder 2 in the curved state as shown in FIG. Curing (curing) by pouring the lower flange concrete (3) of the shape surrounding the lower flange (2c) of the steel I-type girder (2), as shown in Figure 1 (c) Subsequently, if the load Pf applied to the steel I-type girder 2 is removed, the deflection deformation, which is curved downward, is returned to its original state.

At this time, the lower flange concrete (3) surrounding the lower flange (2c) of the steel I-type girder (2) is a steel I by the adhesion and frictional resistance with the surface of the lower flange (2c) of the steel I-type girder (2) It is a conventional preflex composite beam 1 that introduces the prestressed compressive stress into the lower flange concrete 3 in conjunction with the type girder 2, and the lower flange concrete 3 of the preflex composite beam 1 In the cross section of the p. Assemble the strand (4). After the arrangement, the lower flange concrete (3), in which the prestressed compressive stress has already been introduced, as a manufacturing principle of the preflex composite beam 1 as described above (introduced principle of prestressed compressive stress due to deflection and return deformation of the steel I-type girder) P.) By tension-fixing the strand 4, the leafrest preplex composite beam 1 produced by introducing prestress compression stress is produced further.

However, in the case of installing the above-described preflex composite beam 1 on a bridge or alternating bridge in a multi span bridge, the beam 1 of each longitudinally adjacent beam is not continuous and the simple structure system repeats over each span. At this time, it is inevitably required to install the expansion joint of the bridge at the point which is the boundary of each span, which not only decreases the driving performance of the vehicle but also requires much effort and cost for the continuous maintenance of the expansion joint.

The present invention is to solve the problem as described above. As the strand 4, the conventional preplex composite beam is intended to be completely continuous over multiple spans.

The present invention for realizing the technical purpose as described above is a steel I-girder and reinforced concrete and P. By combining the strands, P.C. in making each beam independently on the ground in the same way as a conventional preflex beam. One or both ends of the strand are constructed to be drawn out of the upper surface of the lower flange concrete so that each beam is independently constructed on the alternating or pier of each span, and two beams of longitudinally adjacent steel I on each inner pier The abdomen and the upper flange of the type girders are connected as a joint plate, so that the steel I type girders of each span beam are completely connected together, and at the same time, P. C. is drawn out of the upper surface of the lower flange concrete of each beam. The strand is penetrated over the upper flange of the steel I type girder and the two longitudinally adjacent beams of P.C. Assemble so that each end of the strand can cross each other and be continuous, and then pour the abdomen and slab concrete continuously to form a unitary structure over each span, and then assemble to cross and continually connect in the connection fixing device. Seed. By stiffening the strands sequentially, prestressed compressive stress resisting the constant moment is introduced into the lower flange concrete of the middle beam of the beam across each span, and at the point, the steel I type girders inside the concrete are more firmly and continuously coupled. In the state. The tensioning of the stranded wires allows the prestressed compressive stresses to be introduced into the slab concrete, which resists the parental moments due to live loads.

1 is a side view and a front view sequentially illustrating a method of introducing a prestressed compressive stress to a lower flange concrete by combining a conventional steel I-girder and reinforced concrete;

2 is a side cross-sectional view of a three-span continuous preflex composite girder bridge according to the present invention,

3 is an enlarged side cross-sectional view of two beams longitudinally adjacent above the midpoint pier of FIG.

(A), (b), and (c) of FIG. 4 are cross-sectional views taken along lines A-A, B-B, and C-C of FIG. 3, respectively. Arrangement form of the strand

5 is a partially cutaway perspective view of a composite beam used for the first span and the last span, which are outer beams, according to the present invention;

Figure 6 is a partial cutaway perspective view of the composite beam used in the inner span according to the present invention,

FIG. 7 is an enlarged perspective view of a connection portion of two beams longitudinally adjacent to an inner point pier of FIG. 2;

FIG. 8 is a longitudinal sectional view of the upper flange and the abdomen of the two beams of steel I type girder longitudinally adjacent over the midpoint pier of FIG.

<Description of the symbols for the main parts of the drawings>

1-preflex composite beam, 1a-outer span beam,

1b-beam of outer span, 2-steel I-girder,

2a-upper flange, 2b-abdomen,

2c-lower flange, 3-lower flange concrete,

4-Mr. P. Strand (P.C. strand) 5-shift,

6-pier, 7a-upper flanged joint plate,

7b-abdominal joint plate, 8-connection fixing device,

9-fixed mounting plate, 10-slab concrete,

11-abdominal concrete, 12-tension opening of slab concrete,

13-bolt, 14-through hole for steel I-girder,

15-through hole in connection fixing device.

The present invention will be described in detail with reference to the accompanying drawings.

The present invention provides a number of P. C. in combining the steel I-girder (2) and the lower flange concrete (3). Place the strand (4), but One or both ends of the strand 4 are pulled out from the upper surface of the lower concrete 3 so that the lower concrete 3 is displaced as a displacement of the steel type I girder 2 caused in the manufacturing process of the conventional preflex beam 1. After the first prestressed compressive stress is introduced in Fig. 2, each beam 1 is independently hypothesized on the alternation 5 or the pier 6 of each span as shown in Fig. 2, but the last span of the first span as shown in Fig. 5 is shown. It is produced by dividing the beam 1a between the phosphorus outer span and the beam 1b between the center inner span as shown in FIG.

Next, the steel I type girders 2 as shown in FIGS. 7 and 8 are formed so that the longitudinally adjacent two beams 1 of the two beams 1 are continuous on each of the piers 6 which are boundary portions of each span. Two beams (1) longitudinally adjacent to each other by welding or bolting (13) by installing two layers of abdominal joint plate (7b) and upper joint plate (7a) on upper flange (2a) and abdomen (2b) The abdomen 2b and the upper flange 2a of the steel I-type girder 2 are completely continuous. At this time, the abdominal joint plate (7b) may be provided with a vertical reinforcement in order to directly transfer the vertical load of the point portion from the steel I-girder (2).

When the continuous coupling of the steel I-type girder (2) is completed as described above, P. C exposed outside the upper surface of the lower concrete (3) of the two longitudinally adjacent beams as shown in Figs. . Each upper end of the strand 4 passes through the upper flange 2a of the steel I-type girder 2 so that the upper flange 2a and the lower flange 2c are assembled so as to cross each other on the upper surface of the upper flange 2a. Each p. The through hole 14 that can penetrate the strand 4 should be drilled in advance, and the upper flange 2a of the connection part is lowered slightly as shown in FIGS. 5 and 6.

P. C. withdrawn to the upper surface of the upper flange (2a) as above. In the assembly as shown in Fig. 7 so that the strand 4 can be crossed with each other by the connection fixing device 8 pre-installed on the upper joint plate 7a, the connection fixing device 8 is adjacent to each other in the longitudinal direction. P. C. withdrawn from the dog beam. A plurality of through-holes 15 are formed so that each end of the strand 4 can cross each other, and P. The tensile wire 4 is to be settled.

Steel I type girders 2 and P. C. of two adjacent beams 1 at each point on the pier 6 as described above. When the continuous assembly of the strand 4 is completed, the abdominal and slab concretes 10 and 11 are successively poured so as to be a unitary structure over each span, and then each connection fixing device 8 on the upper joint plate 7a. In the series, P.C. When the strand 4 is sequentially fixed to the bar, for this purpose, where the connection fixing device 8 is installed, the tension opening 12 of the slab concrete is installed in advance when the slab concrete 10 is poured as shown in FIG. 3. After the tensile settlement is completed, the tension opening 12 is filled with concrete or cement mortar to be finished.

So far, steel I type girders 2 and P. C. of two adjacent beams 1 on each pier 6 corresponding to the inner point. As described above, the continuous bonding and the tensile fixation of the strand 4, P. C. withdrawn to the alternating side 5, which is an outer point. Each end of the strand 4 is not provided to the upper surface of the upper flange (2a) as shown in Figure 5, a separate portion provided in the middle portion of the abdomen (2b) of the steel I-type girder (2) at the point above the shift (5) It is fixed by the fixing plate (9) to be embedded in the abdominal concrete (11).

In addition, the connection fixing device (8) installed on the upper joint plate (7a) in the present invention to maintain a predetermined size to be sufficiently embedded in the upper slab concrete (10) as shown in Figure 5, 6 The connection part is formed so that the upper surface of both ends or one end of the mold girder 2 is slightly lowered.

The present invention is a steel I-girder (2), reinforced concrete (3) (10) (11) and P. By properly combining the strand 4, the steel I-type girder 2 inside the concrete 3, 10, 11 is completely continuously coupled to each other as shown in FIG. Since the prestressed compressive stress caused by the strand 4 is continuously introduced over a plurality of spans so as to naturally cross and resist the center positive moment section and the point parent moment section, the same as in the conventional preflex beam 1 As a displacement of the steel type I girder (2) caused during the manufacturing process, firstly, the first compressive prestress stress is introduced into the lower flange concrete (3) of the beam (1), so that the weight of the beam (1) and the abdominal and slab concrete (10) Resisting the dead weight of (11), and the parent moment generated in the steel I type girder (2) when placing the abdomen and slab concrete (10) (11) at the point that is the boundary of each span is the point of the steel I type girder (2) The connection part effectively resists the positive moment of the middle part of the earth due to the live load and the parent moment of the point slab concrete (10). It effectively copes with the secondary prestressed compressive stress due to the tension settling of the strand 4, thereby eliminating the use of the expansion joint of the bridge, and it is more economical than the conventional preflex composite bridge of the simple structure system. It is effective to construct multi-span continuous preplex composite bridge of continuous and safe continuous structure system.

Claims (9)

Combined steel I-girder (2) and lower flange concrete (3) to make each preflex beam (1) independently on the ground, and then on the alternating (5) or pier (6) over multiple spans In the multiple span pre-plex composite bridge, which also hypothesizes the beam 1 of the slab concrete 10 and the abdominal concrete 11, The upper flange 2a and the abdomen 2b of the steel I-type girder 2 of two beams 1 longitudinally adjacent to each of the piers 6 of the inner point are connected to the upper joint plate 7a and the abdominal joint plate ( 7b) to be continuously joined by bolts 13 or welding, and a plurality of P. A multi-span continuous preflex composite bridge characterized in that the strands (4) are arranged so as to intersect the cross-section of the lower flange concrete (3) in the mid-moment section and the slab concrete (10) cross-section in the point-parent section. The upper flange joint of the steel I-girder (2) according to claim 1, wherein the slab concrete (10) and the abdominal concrete (11) are continuously cast and cured over a plurality of spans. It is supported by the connection fixing device 8 on the plate 7a. A continuous preflex composite bridge characterized in that the strand 4 is tensilely fixed. 2. The P.C. 2 according to claim 1, wherein the P is on the upper flange joint plate (7a) of the connection of the steel I-type girder (2) formed above the inner pier (6). The connection fixing device 8 of the strand 4 was installed, and P. C. pulled out of the upper surface of the lower flange concrete 3 of two longitudinally adjacent beams 1. The strand 4 is drawn out through the through hole 14 of the upper flange 2a onto the upper flange 2a, so that each end of the connection fixing device 8 is assembled to be continuous, and is tension fixed. Multi-span continuous preplex composite beam. According to claim 1, wherein the plurality of P. C. in the section where the intersecting portion of the middle section of the middle section and the parent section of the point. A multi-span continuous preflex composite beam characterized in that the strand 4 passes through the cross section of the abdominal concrete 11. The method of claim 1, wherein P.C. In order to tension-fix the strand 4, as shown in FIG. 3, the tension opening 12 is provided in the slab concrete 10 of the upper portion of the upper flange joint plate 7a on the right and left of the connection fixing device 8, respectively. Span continuous preplex composite beam. 2. The P. c of claim 1, wherein the P. A preflex composite beam characterized in that the predetermined length of both ends of the strand 4 is drawn out from the upper surface of the lower flange concrete (3). The top flange (2a) and the bottom flange (2c) of the steel I type girder (2) according to claim 1, wherein the P. The through hole 14 through which the strand 4 can penetrate at a predetermined position, and the upper flange 2a at both ends or one end of the steel I-type girder 2 is lowered free. Flex composite beam. 2. The beams 1a and 1b of the first and last spans are separated and fabricated separately, and the beams 1a used for the outer spans are alternately sided. By means of a separate fixed fixing plate 9 installed in the middle of the abdomen 2b of the steel I-type girder 2 at the point. A multi-span continuous preplex composite beam characterized in that one end of the alternating (5) side of the strand (4) can be assembled and fixed or tension fixed. The device of claim 1, wherein the connection fixing device 8 comprises a plurality of PCs. A multi-span continuous preplex composite beam, characterized in that the through-holes 15 are formed so that the strand 4 can penetrate independently of each other.