KR20160063681A - Prestressed Concrete Girder with Large Vertical Eccentricity, and Continuous Structure of such Prestressed Concrete Girders - Google Patents

Prestressed Concrete Girder with Large Vertical Eccentricity, and Continuous Structure of such Prestressed Concrete Girders Download PDF

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Publication number
KR20160063681A
KR20160063681A KR1020140167236A KR20140167236A KR20160063681A KR 20160063681 A KR20160063681 A KR 20160063681A KR 1020140167236 A KR1020140167236 A KR 1020140167236A KR 20140167236 A KR20140167236 A KR 20140167236A KR 20160063681 A KR20160063681 A KR 20160063681A
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South Korea
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section
psc girder
upper flange
psc
longitudinal direction
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KR1020140167236A
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Korean (ko)
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이상현
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이상현
박정근
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Priority to KR1020140167236A priority Critical patent/KR20160063681A/en
Publication of KR20160063681A publication Critical patent/KR20160063681A/en

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The present invention has a longitudinal cross section in which a hollow is formed in the upper flange, so that when the cross section has the same vertical height, the center of the cross section is located at a higher position than the conventional PSC girder, Quot; large eccentricity PSC girder and its multi-span continuous structure "in which the eccentric distance of the eccentricity of the PSC girder is further increased to thereby further improve the flexural stiffness and thereby form the girders between the low- and high-

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a prestressed concrete girder with large eccentricity and a continuous structure thereof,

The present invention relates to a prestressed concrete girder (hereinafter referred to as "PSC girder ") having a large eccentric distance in the vertical direction from the center of a cross section to a location of a tension member, and a multiple span continuous structure of such a PSC girder And more specifically, the upper flange has a hollow longitudinal cross-section. When the cross-sectional center has the same vertical height, the center of the cross section is located at a higher position than the conventional PSC girder, Quot; large eccentricity PSC girder and its multis span continuous structure "in which the bending stiffness is further improved by the further increase of the eccentric distance up to the maximum eccentric distance.

A PSC girder of the type that introduces a tensile force to a concrete girder is known from Korean Patent Laid-Open No. 10-2001-68055. However, in the case of the PSC girder according to the prior art, there is a limitation in the span length and a large vertical height of the girder. Therefore, expensive girders such as steel composite girders are used in long-span bridges. In order to solve the disadvantages of the general PSC girder, the PSC girder is installed on the pier after synthesizing the first tension, and after synthesizing the bottom plate, the PSC girder is subjected to additional tension And a method of introducing a secondary tension force is proposed. In such a conventional PSC girder, since the work of introducing the tensional force by tensing the tension member is performed twice (introduction of the primary tension force and introduction of the secondary tension force), the amount of work is increased and the air is lengthened, There is a drawback that the cost is also increased. Particularly, in the conventional PSC girder, since the first and second tensions are used for the first and second tensions, the amount of use of the tensions is also increased, resulting in a disadvantage that the construction cost is large. Further, in the conventional PSC girder, since a separate protrusion is formed on the side of the PSC girder in the lateral direction (perpendicular to the throttle axis) in order to arrange the secondary tension force introducing tension member for introducing and reinforcing the secondary tension force, The PSC girder has a disadvantage in that it is not only poor in workability but also requires a work of tightening the second tension member in a narrow space on the side of the PSC girder only after the bottom plate is synthesized on the top of the PSC girder.

Korean Patent Publication No. 10-2001-68055 (published on July 13, 2001).

The present invention has been developed in order to solve the disadvantages and disadvantages of the prior art as described above. Specifically, it is a PSC girder having a long span configuration with a low height, Instead of two tensioning operations, the tensioning operation combined with the bottom plate, the PSC girder which has the rigidity of the PSC girder required in the design by a single tension operation and its continuous structure is provided, And it is intended to shorten the air at the time of constructing the bridge using the PSC girder and reduce the construction cost.

Further, unlike the PSC girder according to the related art, the present invention provides a PSC girder having sufficient tension force introduction structure without any separate protrusions formed on the lateral side for secondary tension and its continuous structure And it is an object of the present invention to solve such problems as deterioration in side aesthetics caused by the presence of the secondary tension projections and deterioration of workability of the secondary tension work.

In order to achieve the above object, according to the present invention, there is provided a PSC girder in which a tensile force is introduced by a tension member in the longitudinal direction, and has an upper flange, an abdomen and a lower flange, ; And a hollow portion extending in the longitudinal direction is formed in the upper flange.

In the present invention, the PSC girders are continuously arranged in a longitudinal direction and are continuous in multiple spans, wherein tension members for reinforcing the momentum reinforcement are arranged in an upper flange on both sides of two adjacent PSC girders, And the end portions of the tension members are tension-fixed in the recesses, respectively, to provide a continuous structure of the PSC girder.

In the PSC girder and the continuous structure of the present invention as described above, the hollow portion may be filled with a lightweight filler. In the central portion of the PSC girder, the cross-sectional shape of the I-shaped letter having the upper flange, the abdomen and the lower flange is constant There is a first same section section to be maintained; There is a sectional section in which the shape of the section is changed from the end point of the first same section section to both end directions, respectively; There is a second same sectional section in which the sectional shape is kept constant from the section change section to both longitudinal sections; In the section change section, the vertical size of the upper flange increases in both longitudinal directions; Sectional shape in the second same sectional section without distinguishing between the upper flange and the web and the lower flange.

The PSC girder according to the present invention has a cross section in which the hollow portion is formed in the upper flange, so that the center of the cross section is moved upward, and thus the eccentric distance from the center of the cross section to the tensile member The effect of introducing the compression prestress by the tensile material is maximized. Therefore, according to the present invention, it is possible to form a long-span girder with a low stiffness only by the primary tension work introduced when the PSC girder is manufactured, so that it is possible to expect shortening of work time, shortening of air time, and reduction of construction cost.

According to the present invention, it is possible to improve the side aesthetics of the PSC girder beautifully, and it is possible to provide a PSC girder which is another problem of the conventional PSC girder and in which workability deterioration due to secondary tension work in a narrow space on the side of the PSC girder There is an advantage that it does not.

The PSC girder of the present invention can be gradually changed in its cross-sectional shape along both ends in the longitudinal direction. In this case, not only the lateral side view of the PSC girder is greatly improved, but also the increase of the abdominal width And the strength of the resistance against the moment can be greatly improved by enlarging the girder section size.

1 is a schematic perspective view of a PSC girder according to an embodiment of the present invention.
2 is a schematic longitudinal sectional view of the PSC girder of the present invention taken along the line PP of FIG.
3 is a schematic longitudinal sectional view for eccentric distance comparisons in two PSC girders having the same vertical height.
4 is a schematic perspective view of a PSC girder according to another embodiment of the present invention having a configuration in which the shape of a cross section is changed along both longitudinal ends.
Fig. 5 is a schematic lateral side view of the PSC girder shown in Fig. 4. Fig.
Figure 6 is a schematic longitudinal cross-sectional view along line BB of Figure 5;
7 is a schematic longitudinal side view seen in the direction of arrow C in Fig.
8 is a schematic perspective view showing a state in which two PSC girders of the present invention are continuously arranged in the longitudinal direction.
Fig. 9 is a lateral side view of the state of Fig. 8; Fig.
10 is a schematic lateral side view of a continuous three span continuous PSC girder according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

1 is a schematic perspective view of a PSC girder 100 according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of a PSC girder 100 of the present invention taken along the line PP of FIG. Sectional view is shown.

1 and 2, the PSC girder 100 of the present invention has an upper flange 1, a web 2 and a lower flange 3 and has an alphabet letter I shape in the longitudinal direction Unlike the conventional PSC girder, the upper flange 1 has a hollow portion 10 formed therein. The hollow portion 10 is formed long in the upper flange 1 in the longitudinal direction. It is preferable that the hollow portion 10 is not exposed on the end face at both longitudinal ends of the PSC girder 100. The hollow part 10 may exist as an empty space and the hollow part 10 may be formed of a lightweight filler 11 such as compressed styrofoam or foam so as to efficiently absorb vibrations, noise, etc. generated in the PSC girder 100. [ . ≪ / RTI > The lower flange 3 is arranged in a state where the tension members 31 extended in the longitudinal direction are stretched in order to reinforce the tensile stress.

In the PSC girder 100 of the present invention having the upper flange 1 formed with the hollow portion 10 as described above, the distance from the center of the cross section of the PSC girder to the center of the tensile material 31, that is, . Fig. 3 shows a schematic longitudinal cross-sectional view for comparison of eccentric distances in two PSC girders having the same vertical height, wherein Fig. 3 (a) is a longitudinal sectional view of the PSC girder of the present invention, Fig. 3 (B) is a longitudinal sectional view of a conventional PSC girder.

Since the PSC girder 100 of the present invention has the hollow portion 10 formed in the upper flange 1, the cross-sectional size of the upper flange 1 can be increased in a state where the increase of the self weight is minimized, As the cross-sectional size of the upper flange 1 is increased, the center of the cross section is located above the conventional PSC girder. That is, since the PSC girder 100 according to the present invention has a cross section in which the hollow portion 10 is formed in the upper flange 1 as described above, even if the size of the upper flange 1 is increased, And the center of the cross section is moved upward as the size of the upper flange 1 is increased.

3, the eccentric distance e p1 of the PSC girder 100 according to the present invention becomes larger than the eccentric distance e p2 of the PSC girder according to the prior art, The effect of introducing the compression prestress by the PSC girder is larger than that of the conventional PSC girder and is maximized. That is, the PSC girder 100 according to the present invention maximizes the effect of introducing the compression prestress by the prestressing material 31 more than the conventional PSC girder having the same vertical height. Therefore, the primary tension work It is possible to form a long-span girder with a low profile, and it is possible to expect a shortening of operation, a shortening of the air, and a reduction in the construction cost. That is, according to the present invention, it is possible to solve the problem of performing two tension works (introduction of primary tension at the time of making the girder and introduction of secondary tension after combining with the bottom plate) It is possible to solve the disadvantages of an increase in the workload, an increase in the amount of use of the tensile material, and an increase in air delay and construction cost.

Particularly, in the conventional PSC girder, a separate protrusion is provided on the side in the transverse direction (direction perpendicular to the throttle axis) for disposing the second tensioning force-introducing tension member, It is possible to improve the side aesthetics of the PSC girder beautifully because no protruding portion as in the prior art is required at all. Another problem of the conventional PSC girder and the work due to the second tension operation in the narrow space of the PSC girder side There is an advantage in that degradation of the property is not caused at all in the present invention.

When the longitudinally opposite ends of the PSC girder 100 are placed at points such as bridge piers, the shear stress at both longitudinal ends of the PSC girder 100 and the working stress due to the parent moments become large. The shape of the cross section of the PSC girder 100 according to the present invention can be changed in the longitudinal direction in accordance with the circumstances. \

4 shows a schematic perspective view of a PSC girder 100 according to the present invention having a configuration in which the cross-sectional shape changes along the longitudinal direction as another embodiment of the present invention. A schematic lateral side view of the PSC girder 100 is shown. As shown in Figs. 4 and 5, the PSC girder 100 of the present invention can be changed in sectional shape in such a manner that the vertical size of the upper flange 1 gradually increases with both ends in the longitudinal direction. That is, while the overall height of the PSC girder 100 is kept constant in the longitudinal direction, the vertical position of the upper flange 1 is increased as the lower end position of the upper flange 1 is gradually lowered downwardly will be. As shown in FIG. 5, the PSC girder 100 may have a first section section S1 (see FIG. 5) in which the shape of the section is kept constant, There is a section change section T in which the shape of the section is changed over a section of a predetermined length in both ends from the end point of the first same section section S, ) To the longitudinal cross-section and again the second cross-sectional section S2 in which the cross-sectional shape is maintained constant. In Fig. 7, the dashed line represents the longitudinally arranged tension member 31. Thus, when the cross-sectional shape of the PSC girder 100 is changed along both longitudinal ends, the hollow portion 10 is present in the upper flange 1 at the section change period T and the second same cross section S2 And the hollow portion 10 may be formed in the upper flange 1 only in the first same section section S1. That is, the section change section T and the second same section section S2 are formed in a full-width section, and only the first same section section S1 has a cross section in which the hollow section 10 is formed in the upper flange 1. [ It is.

Figure 6 shows a schematic longitudinal section (a schematic longitudinal section according to line BB of Figure 5) of the section change period T of the PSC girder 100 shown in Figures 4 and 5, 7 is a side view of the PSC girder 100 shown in Figs. 4 and 5 on the longitudinally opposite ends thereof, that is, a schematic longitudinal side view seen in the direction of the arrow C in Fig. 5. The longitudinal sectional shape of the first same sectional section S1, that is, the longitudinal sectional shape along the line A-A of FIG. 5 is the same as that of FIG. 2, and therefore, a further illustration is omitted.

As described above, in the PSC girder 100 of the present invention, after the hollow section 10 is formed in the upper flange 1 and the first same sectional section S1 is formed in the upper flange 1, 4 to 6, the vertical size of the upper flange 1 gradually increases in both the longitudinal direction and the longitudinal direction, as shown in FIGS. . The PSC girder 100 may have a rectangular cross-sectional shape without distinguishing between the upper flange, the web, and the lower flange at both ends of the PSC girder 100, that is, the second section section S2 following the section section T. In the drawing, reference numeral 35 denotes a fixing plate 35 to which a tension member 31 is fixed.

Particularly, as described above, in the PSC girder 100 of the present invention, when the cross-sectional change section T is formed by changing the shape of the cross-section, as shown in FIG. 5, In this case, the lateral side aesthetics of the PSC girder 100 can be greatly improved. Of course, since the section size of the PSC girder 100 is enlarged at the section change period T and at both ends, the resistance ability against the momentum can be greatly improved.

The PSC girder 100 according to the present invention may be used alone to be used as a short-span bridge or the like, but may be used as a multi-span structure in which a plurality of PSC girders 100 are continuously arranged in the longitudinal direction. 8 shows a schematic perspective view showing a continuous structure of multiple PSC girders according to the present invention in which two PSC girders 100 of the present invention are continuously arranged in the longitudinal direction, A lateral side view of the state is shown.

As shown in FIGS. 8 and 9, when a plurality of PSC girders 100 are used in multiple spans continuously in the longitudinal direction, in order to reinforce the PSC girders 100 corresponding to the moment generated at the continuous point portions, (4) may be further disposed within the PSC girder (100). That is, the tension moment 4 for reinforcing the momentum of the upper flange 1 can be tense over both of the two neighboring PSC girders 100. To this end, a concave portion 13 is formed on the upper surface of the upper flange 1 at the continuous end of the PSC girder 100, and a concave portion 13 is formed on both sides of the PSC girder 100, The end portions of the tensile strength reinforcement material 4 can be tension-fixed in the concave portions 13, respectively.

In the above description, the PSC girder 100 may be disposed in a sequential manner of three or more spans in the present invention. Fig. 10 shows a schematic lateral side view of three PSC girders 100 in a continuous three-span continuous state. The PSC girders 100 according to the present invention can be continuous not only in two but also in a number of three or more as shown in Fig. Spatial continuity of the plurality of PSC girders 100 is the same as that described above, and thus repeated description thereof will be omitted.

1: Upper flange
2: abdomen
3: Lower flange
10: hollow
100: PSC girder

Claims (4)

As a PSC girder (100) in which a tensile force is introduced by a tensile member (31) in the longitudinal direction,
Has an upper flange (1), a web (2) and a lower flange (3), and has a cross-sectional shape of letter-letter I shape in the longitudinal direction;
And a hollow portion (10) extending in the longitudinal direction is formed in the upper flange (1).
The method according to claim 1,
Characterized in that the hollow portion (10) is filled with a lightweight filler (11).
3. The method according to claim 1 or 2,
There is a first same sectional section S1 at the center of the PSC girder 100 in which the cross-sectional shape of the I-shaped alphabet having the upper flange 1, the abdomen 2 and the lower flange 3 is constantly maintained ;
There is a section change section T in which the shape of the section is changed from the end point of the first same section section S to both ends in each direction;
There is a second same sectional section S2 in which the sectional shape is kept constant from the section changing section T to both longitudinal sectional sections;
In the section change period T, the vertical size of the upper flange 1 increases in both longitudinal direction directions;
Sectional shape in a second same section section (S2) without a distinction between an upper flange, a web and a lower flange.
A continuous structure in which the PSC girder 100 in which a tensile force is introduced by the tensile member 31 in the longitudinal direction is continuous in multiple spans,
The PSC girder 100 has an upper flange 1, a web 2 and a lower flange 3 and has a cross-sectional shape in the longitudinal direction of the letter I character, (Hollow portion) 10 extending in the longitudinal direction is formed;
A plurality of PSC girders 100 are continuously arranged in the longitudinal direction;
At the continuous end of the PSC girder (100), a recess (13) is formed on the upper surface of the upper flange (1);
The tension member 4 is arranged in tension on the upper flange 1 over both adjacent PSC girders 100 so that the ends of the tension member 4 for reinforcing the momentum tend to be located within the recess 13 Wherein the PSC girder has a structure in which a tension is fixed.
KR1020140167236A 2014-11-27 2014-11-27 Prestressed Concrete Girder with Large Vertical Eccentricity, and Continuous Structure of such Prestressed Concrete Girders KR20160063681A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102009704B1 (en) 2018-11-23 2019-08-12 (주)우리컨스텍 Steel permanent landfill form using upper flange box compound gider and construction method using the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010068055A (en) 2001-04-18 2001-07-13 김형열 PSC Girder having Anchoring Sleeves and Strengthening Method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010068055A (en) 2001-04-18 2001-07-13 김형열 PSC Girder having Anchoring Sleeves and Strengthening Method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102009704B1 (en) 2018-11-23 2019-08-12 (주)우리컨스텍 Steel permanent landfill form using upper flange box compound gider and construction method using the same

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