KR101659572B1 - Double composite box girder with free concrete shrinkage and the construction method therefor - Google Patents
Double composite box girder with free concrete shrinkage and the construction method therefor Download PDFInfo
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- KR101659572B1 KR101659572B1 KR1020160012181A KR20160012181A KR101659572B1 KR 101659572 B1 KR101659572 B1 KR 101659572B1 KR 1020160012181 A KR1020160012181 A KR 1020160012181A KR 20160012181 A KR20160012181 A KR 20160012181A KR 101659572 B1 KR101659572 B1 KR 101659572B1
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- Prior art keywords
- concrete
- steel box
- free end
- box girder
- double
- Prior art date
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Classifications
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
- E01D2101/285—Composite prestressed concrete-metal
Abstract
When a bridge is constructed using double synthetic steel box girder, it is possible to reduce the weight by excluding a part of the lower concrete at the point of the shear retardation part, but it is possible to reduce the weight of the concrete due to the dew condensation The present invention relates to a double synthetic steel box girder having a center free end that can effectively prevent corrosion of a synthetic steel box girder while securing safety in terms of structure and a construction method thereof. The center free edge is formed on the basis of the lateral width of the lower flange in which the shear strap is most likely to be absorbed so that the gap between the upper ends of the lower concrete and the abdomen of the lower concrete is not caused by the drying shrinkage.
Description
The present invention relates to a double composite steel box girder having a center free end and a construction method thereof. More specifically, when a bridge is constructed using a double synthetic steel box girder, it is possible to reduce the self weight by excluding a part of the lower concrete at the point of the shear retardation site, but also the number of dew condensation due to rain etc. The present invention relates to a double synthetic steel box girder having a center free end which can effectively prevent corrosion of double synthetic steel box girder and can ensure safety in terms of structure and a construction method thereof.
The
These
Further, examples of the installation of the longitudinal and
Since the lower flange is a compression flange, the steel box girder located at the bridge pier (fulcrum part) is composed of an additional lower concrete (not shown) on the upper flange so as to more effectively resist the bending moment, The lower concrete is additionally provided with a shear connection member (stud, not shown) on the upper surface of the
At this time, the steel box girder is painted with color to prevent surface corrosion.
However, there is no proper way to solve the problem because the abdomen and lower flange are corroded due to infiltration of infiltration water into the gap between the lower portion of the steel box girder abutting the lower concrete after the construction and maintenance.
That is, as shown in FIG. 1B, the
In addition, shear lag phenomenon occurs as the shear load ratio decreases remarkably along the region extending from the upper side of the
As shown in FIG. 1c, an induced waterproofing structure is introduced at a joint portion where a groundwater leakage problem occurs, such as an underground continuous wall.
That is, the
However, the application of the induction and waterproof structure for installing such a hose to the conventional steel girder box is limited because it is interfered by the longitudinal and transverse ribs and the shear connection member, so that it can not be applied differently. There was a problem.
As a result, it is possible to prevent the corrosion of the steel material by the penetration water in the cross-sectional structure in which the lower concrete having the constant thickness is formed on the both abdomen and the lower flange like the double synthetic steel box girder. At present, no method has been disclosed for effectively controlling this.
Accordingly, it is an object of the present invention to provide a double synthetic steel box girder which can be manufactured more economically while effectively resisting compressive force acting on the fulcrum portion P, and which can prevent corrosion due to infiltration water at a portion where the lower concrete is formed It is possible to overcome the shear delay phenomenon and to reduce the weight by eliminating the lower concrete at the center part of the lower flange by the shear force delay and to be able to reinforce the central part of the lower flange, And a method of constructing the box girder.
Accordingly, the present invention provides a dual synthetic steel box girder,
First, the center part of the lower part concrete is separated by about 10% (10% of the transverse width of the lower flange) so that the center free part acts as the free end of drying shrinkage, And the gap between the lower part of the abdominal wall.
Since the generation of cracks can be prevented by controlling the occurrence of cracks, maintenance of the bridge can be improved, and generation of cracks can be controlled, thereby effectively restricting the very large shear force acting on the contact surface between the upper portions of the lower concrete and the upper plate The structural safety can be sufficiently improved.
Secondly, the central free end does not contribute to the section stiffness but excludes the portion which acts as unnecessary load, thereby reducing the weight of the double composite steel box girder, thereby improving the workability. Further, due to the lighter upper structure, The scale can be reduced, which makes it possible to construct more economical bridges.
Third, the double composite steel box girder is formed by the open cross-section, and the lower concrete is composited by the compressive shear connection material on the upper flange, which is a compression flange located at the fulcrum portion. By acting as a transverse rib, the lower flange, which is the compression flange, does not have to be provided with conventional longitudinal and transverse ribs.
Fourth, the bottom free flange is reinforced by providing a compression shear connection material such as a T-shaped steel material capable of having a large load load at the center free end to reinforce the lower flange. In the lower flange and the upper and lower abutment portions, And the inner steel box body is installed on the both side plates and the lower flange so that the infiltration water can be prevented and the structural safety can be sufficiently ensured.
According to the present invention, since the double synthetic steel box girder can control the clearance between the lower concrete and the concrete due to drying and shrinking of the concrete by the center free end, it is possible to more effectively prevent the corrosion of the steel due to penetration of permeate water. It becomes very advantageous.
In addition, in the compression flange (lower flange), the conventional longitudinal rib and the transverse rib are used in place of the conventional shear joint for compressing, so that the composite performance of the lower concrete and the slab concrete can be ensured, It is possible to simplify the manufacture of the box girder, thereby reducing the amount of steel material required and reducing the area of color coating, thereby remarkably reducing the manufacturing cost of the entire double composite steel box girder, It is possible to secure the resistance against the bending moment and thus it is possible to construct a double synthetic steel box girder which is structurally very efficient.
In addition, it is possible to more effectively reinforce the lower flange, which is the compression flange, through the compressive stress stiffener at the center free end, which is advantageous for reducing the weight and reinforcing the flexure.
FIG. 1A is a cross-sectional view of a conventional double composite steel box girder,
Fig. 1B is a diagram showing the drying shrinkage and shearing delay action of a conventional double synthetic steel box girder,
FIG. 1C is an inductive drainage structure in a joint connection portion of a conventional concrete member (underground continuous wall)
Figure 2 is a functional diagram of the central free end of the present invention,
FIGS. 3A, 3B and 3C are cross-sectional exemplary views of a double composite steel box girder in which a central lower portion concrete is excluded,
FIGS. 4, 5, and 6 are views showing the construction of a double composite steel box girder without a central lower portion concrete according to the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.
Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.
[Operation of the central
Figure 2 illustrates the operation of the central
It can be seen that the double synthetic
At this time, it can be seen that the portion (shear edge portion) which does not contribute to the section rigidity and acts as an unnecessary load is formed as a hollow space in the present invention.
Therefore, when the drying and shrinking of the
[Double composite steel box girder (100) with central free end of the present invention]
FIGS. 3A, 3B and 3C show exemplary views of a double composite
3A, the double composite
At this time, it can be seen that the
It can be seen that the
Specifically, the
The
The compression
That is, since the
In order to effectively resist the
At this time, the
For this purpose, the compression
Accordingly, the
The
The
Therefore, the lower concrete, the lower flange, and the sheep portion are merely synthesized integrally with each other by the compression
Accordingly, it can be seen that the central
2, the
It is noted that a
That is, the
In addition, it can be seen that the
Thus, the present invention prevents the gap between the lower and upper portions of the
The
Next, the dual synthetic
3b, the double composite
Specifically, the
The
The compression
That is, since the
In order to effectively resist the
At this time, the
For this purpose, the compression
Accordingly, the
The
The
Therefore, the lower concrete, the lower flange, and the sheep portion are merely synthesized integrally with each other by the compression
Accordingly, it can be seen that the central
It can be seen that a
That is, the
Thus, the
In addition, it can be seen that an
Thus, the present invention prevents the gap between the lower and upper portions of the
In this case, the central
Next, the double composite
Referring to FIG. 3C, the double synthetic
Specifically, the
The
The compression
That is, since the
In order to effectively resist the
At this time, the
For this purpose, the compression
Accordingly, the
The
The
Therefore, the lower concrete, the lower flange, and the sheep portion are merely synthesized integrally with each other by the compression
In particular, the
Accordingly, it can be seen that the central
3C, a compressive stress stiffener having a T-shaped cross section is not formed in the lower
That is, the
Accordingly, it can be seen that the inner
The inner
Thus, the present invention prevents the gap between the
This is a case in which the structural safety can be ensured more than in Figs. 3A and 3B while absorbing the drying shrinkage of the lower concrete, and the lower concrete is restrained by the inner
[Method of constructing a dual synthetic steel box girder with a free free end of the present invention]
FIGS. 4, 5 and 6 illustrate a method of constructing a dual synthetic steel box girder with a central free end according to the present invention, which comprises a double synthetic steel box girder with a central free end according to FIGS. 3a, 3b, It is about the construction method.
First, as shown in FIG. 4, a double synthetic
In the factory constructed double composite
A compression
The
The
At this time, the steel box girder 100b in which the
Next, the description will be made with reference to a double synthetic steel box girder having a center free end according to FIG. 3b.
That is, as shown in FIG. 5, a double synthetic
In the factory constructed double composite
A compression front
The
The
At this time, the steel box girder 100b in which the
Next, the double synthetic
6, a double synthetic
In the factory constructed double composite
A compression front
The
The
It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.
The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.
100: Double composite steel box girder
110: Lower flange
120: Sheep abdomen
130: central free end
140: Shear connector for compression
150: Lower concrete
160: Compressive stress stiffener
170: penetration prevention plate
200: Slab
Claims (18)
The lower concrete 150 has a center free end formed on the basis of the lateral width of the lower flange where the shear pendant generates the greatest amount so as to absorb the shrinkage caused by the drying shrinkage of the concrete, The gap between the upper and lower abdomen is not caused by drying shrinkage,
The lower concrete 150 is separated from each other by a central free end 130 in the form of an empty space formed at a central portion of the lower flange and integrally formed with the lower flange and the lower shear joint member 140 Lt; / RTI &
A double synthetic steel box having a central free end for forming a penetration preventing plate 170 in the form of a horizontal plate for preventing infiltration of infiltration water is formed on both upper side surfaces of the lower concrete 150 contacting with the double- Girder.
The center free end (130) is provided with a central free end for forming a compressive stress stiffener (160) including a bar of T-shaped cross section on the upper surface of the lower flange.
The compression front shear connection member (140) is provided with a central free end spaced apart from each other at positions where longitudinal ribs and transverse ribs are installed to replace longitudinal ribs and transverse ribs.
The lower concrete 150 has a center free end formed on the basis of the lateral width of the lower flange where the shear pendant generates the greatest amount so as to absorb the shrinkage caused by the drying shrinkage of the concrete, The gap between the upper and lower abdomen is not caused by drying shrinkage,
The lower concrete 150 has a central free end 130 in the form of a recessed groove on the upper surface of the lower concrete corresponding to the upper portion of the upper flange upper surface, And is integrally formed,
A double synthetic steel box having a central free end for forming a penetration preventing plate 170 in the form of a horizontal plate for preventing infiltration of infiltration water is formed on both upper side surfaces of the lower concrete 150 contacting with the double- Girder.
And a central free end is formed at a lower portion of the central free end 130 to form a compressive stress stiffener 160 including a rod having a T-shaped cross section on the upper surface of the lower flange.
The compression front shear connection member 140 has a central free end formed as a spacing member spaced apart from each other at positions where longitudinal and transverse ribs are installed so as to replace the longitudinal ribs and the transverse ribs.
The lower concrete 150 has a center free end formed on the basis of the lateral width of the lower flange where the shear pendant generates the greatest amount so as to absorb the shrinkage caused by the drying shrinkage of the concrete, The gap between the upper and lower abdomen is not caused by drying shrinkage,
The lower concrete 150 is separated from each other by a central free end 130 in the form of an empty space formed at a central portion of a lower flange and is connected to an opposite vertical plate 182 formed on the upper surface of the upper flange, And a pair of upper horizontal plates 181 extending from the inner side of the vertical portion of the vertical plate 181 and connected to the upper end of the vertical plate 181. The lower flange and the shear connection member 140) having a central free end formed integrally therewith.
The compression front shear connection member (140) is provided with a central free end spaced apart from each other at positions where longitudinal ribs and transverse ribs are installed to replace longitudinal ribs and transverse ribs.
(a) A steel box girder having a lower concrete located at a fulcrum of a factory is manufactured. The lower concrete (150) has a lateral direction of a lower flange in which a shear ply is most largely generated to absorb shrinkage due to concrete drying shrinkage So that a clearance between the upper ends of the upper and lower portions of the lower concrete is not generated by the drying shrinkage;
(b) loading the double composite steel box girder (100) with the lower concrete (150) into the site and placing the lower concrete (150) at the fulcrum portion; And
(c) placing slab concrete on the top of the double bottom portion of the dual synthetic steel box girder 100 to integrate the double composite steel box girder 100 with the slab,
The lower concrete 150 in the step (a) is formed separately from the central free end 130 in the form of an empty space formed at the center of the upper flange, ),
A double synthetic steel box having a central free end for forming a penetration preventing plate 170 in the form of a horizontal plate for preventing infiltration of infiltration water is formed on both upper side surfaces of the lower concrete 150 contacting with the double- Girder construction method.
(a) A steel box girder having a lower concrete located at a fulcrum of a factory is manufactured. The lower concrete (150) has a lateral direction of a lower flange in which a shear ply is most largely generated to absorb shrinkage due to concrete drying shrinkage So that a clearance between the upper ends of the upper and lower portions of the lower concrete is not generated by the drying shrinkage;
(b) loading the double composite steel box girder (100) with the lower concrete (150) into the site and placing the lower concrete (150) at the fulcrum portion; And
(c) placing slab concrete on the top of the double bottom portion of the dual synthetic steel box girder 100 to integrate the double composite steel box girder 100 with the slab,
The lower concrete 150 in the step (a) has a central free end 130 in the form of a recessed groove in the upper surface of the lower concrete corresponding to the upper part of the upper surface of the lower flange, (140)
A double synthetic steel box having a central free end for forming a penetration preventing plate 170 in the form of a horizontal plate for preventing infiltration of infiltration water is formed on both upper side surfaces of the lower concrete 150 contacting with the double- Girder construction method.
(a) A steel box girder having a lower concrete located at a fulcrum of a factory is manufactured. The lower concrete (150) has a lateral direction of a lower flange in which a shear ply is most largely generated to absorb shrinkage due to concrete drying shrinkage So that a clearance between the upper ends of the upper and lower portions of the lower concrete is not generated by the drying shrinkage;
(b) loading the double composite steel box girder (100) with the lower concrete (150) into the site and placing the lower concrete (150) at the fulcrum portion; And
(c) placing slab concrete on the top of the double bottom portion of the dual synthetic steel box girder 100 to integrate the double composite steel box girder 100 with the slab,
The lower concrete 150 in the step (a) is separated from each other by the central free end 130 in the form of an empty space formed at the center of the upper flange, And is formed inside the inner steel box body 180 including the vertical plate 182 and the upper upper horizontal plate 181 extending from the inner side of the upper portion of the vertical plate and connected to the upper end of the vertical plate, A method of constructing a dual synthetic steel box girder having a central free end formed with a central free end integrally formed by a compression shear connection member (140).
Wherein the dual synthetic steel box girder of step (a) is formed of an open form without an upper flange.
The method of claim 1, wherein the compressive shear connectors (140) have a central free end spaced apart from each other at locations where the longitudinal ribs and the transverse ribs are installed to replace longitudinal ribs and transverse ribs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| KR1020160012181A KR101659572B1 (en) | 2016-02-01 | 2016-02-01 | Double composite box girder with free concrete shrinkage and the construction method therefor |
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| KR1020160012181A KR101659572B1 (en) | 2016-02-01 | 2016-02-01 | Double composite box girder with free concrete shrinkage and the construction method therefor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101993602B1 (en) * | 2018-11-19 | 2019-06-27 | 에스오씨기술지주 주식회사 | Steel girder formwork structure and reinforcement structure of steel girder parent part |
| KR102068307B1 (en) | 2019-08-22 | 2020-01-20 | 주식회사 더빔에스아이 | Double composite steel box girder using t-conner reinforcing member and construction method therewith |
| KR102173788B1 (en) | 2020-05-08 | 2020-11-04 | 주식회사 더빔에스아이 | Double composite box girder with gradual stiffness reduction, and construction method thereof |
| KR102249354B1 (en) * | 2020-10-05 | 2021-05-07 | 주식회사 서린브릿지텍 | Double composite box girder with separate pouring bottom concrete structure and the construction method therefor |
| CN114575234A (en) * | 2022-04-12 | 2022-06-03 | 中建路桥集团有限公司 | Cast-in-place box girder and bridge structure applying same |
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| KR100938572B1 (en) * | 2009-05-29 | 2010-01-26 | 산이건설 주식회사 | Steel box girder with differential strength |
| KR100970247B1 (en) * | 2008-04-21 | 2010-07-16 | 동국대학교 산학협력단 | Compressed flange structure of composite-steel box girder |
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| KR101476290B1 (en) * | 2014-05-09 | 2014-12-24 | 우경기술주식회사 | Steel composite PSC corrugated steel plate U girder |
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2016
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| KR100970247B1 (en) * | 2008-04-21 | 2010-07-16 | 동국대학교 산학협력단 | Compressed flange structure of composite-steel box girder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101993602B1 (en) * | 2018-11-19 | 2019-06-27 | 에스오씨기술지주 주식회사 | Steel girder formwork structure and reinforcement structure of steel girder parent part |
| KR102068307B1 (en) | 2019-08-22 | 2020-01-20 | 주식회사 더빔에스아이 | Double composite steel box girder using t-conner reinforcing member and construction method therewith |
| KR102173788B1 (en) | 2020-05-08 | 2020-11-04 | 주식회사 더빔에스아이 | Double composite box girder with gradual stiffness reduction, and construction method thereof |
| KR102249354B1 (en) * | 2020-10-05 | 2021-05-07 | 주식회사 서린브릿지텍 | Double composite box girder with separate pouring bottom concrete structure and the construction method therefor |
| CN114575234A (en) * | 2022-04-12 | 2022-06-03 | 中建路桥集团有限公司 | Cast-in-place box girder and bridge structure applying same |
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