CN108729335B - Steel-concrete combined section and installation method thereof - Google Patents
Steel-concrete combined section and installation method thereof Download PDFInfo
- Publication number
- CN108729335B CN108729335B CN201810556877.7A CN201810556877A CN108729335B CN 108729335 B CN108729335 B CN 108729335B CN 201810556877 A CN201810556877 A CN 201810556877A CN 108729335 B CN108729335 B CN 108729335B
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- steel
- box girder
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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
- 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
Abstract
The invention discloses a reinforced concrete combined section and an installation method thereof, wherein the reinforced concrete combined section comprises an embedded-type connected reinforced concrete combined box girder and a reinforced concrete box girder, wherein the reinforced concrete combined box girder and the reinforced concrete box girder are provided with corresponding reserved holes, and are fixedly connected through steel bars, the reinforced concrete combined box girder comprises a bolt support arranged on a first concrete top plate and a concrete bottom plate of the reinforced concrete combined box girder, the bolt support is provided with a first reserved hole along the width direction of the reinforced concrete combined box girder, and the first reserved hole is a through hole.
Description
Technical Field
The invention relates to the field of construction of reinforced concrete composite bridges, in particular to a reinforced concrete combined section and an installation method thereof.
Background
The steel-concrete composite bridge is a novel bridge structural form developed after a steel-concrete composite bridge, and the girder of the bridge is longitudinally formed by mixing a concrete beam, a composite beam and a steel beam, so that the characteristics of two materials of steel and concrete are fully exerted. One of the main composite bridge structural forms in the current engineering is to replace the midspan section of the girder of the box girder bridge with a steel-concrete combined structure with a steel box girder with lighter dead weight, thereby reducing the dead weight of the girder, increasing the spanning capacity of the girder and having good economical efficiency and construction condition adaptability. However, because the material characteristics of steel and concrete are too different, the deformation coordination has a large difference, so the problem of cooperative stress of the steel-concrete joint is always highly valued by bridge designers.
At present, more connecting structures are mainly formed by connecting a concrete bottom plate and a steel bottom plate by adopting a transition section, the method has complicated site construction, and the positioning and construction of the anchor holes have extremely high requirements on precision, thereby bringing inconvenience to construction. Therefore, the steel-concrete joint section with simple structure and capability of meeting the stress performance and the installation method thereof are innovated from the purposes of reducing the construction difficulty of the steel-concrete joint section, improving the construction efficiency and shortening the construction period.
Disclosure of Invention
The invention aims to overcome the defects of the existing steel-concrete composite bridge connecting part, and provides a steel-concrete combined section and an installation method thereof, which have simple structure and convenient construction, and can improve the cooperative stress capacity of the steel-concrete combined part, thereby being more suitable for practical use and having industrial utilization value.
The aim and the technical problems of the invention are realized by adopting the following technical proposal.
The steel-concrete combined section comprises a steel-concrete combined box girder and a steel box girder which are connected in an embedded mode, wherein the steel-concrete combined box girder and the steel box girder are provided with corresponding reserved holes and are fixedly connected through steel bars.
Further, the reinforced concrete combination section comprises a bolt support arranged on a first concrete top plate and a concrete bottom plate of the reinforced concrete combination box girder, the bolt support is provided with a first reserved hole along the width direction of the reinforced concrete combination box girder, and the first reserved hole is a through hole.
Further, at least four bolt supports are arranged on the inner top plate and the inner bottom plate of the steel-concrete combined box girder, and the bolt supports are distributed in a longitudinal and transverse arrangement mode.
Further, the joint of the bolt support and the first concrete top plate and the concrete bottom plate of the reinforced concrete combined box girder is of a prismatic table structure.
Further, an epitaxial perforated steel plate is arranged at one end of the steel box girder, and the perforated steel plate is arranged along the length direction of the steel box girder.
Further, the perforated steel plate comprises a first perforated steel plate arranged on two sides and a second perforated steel plate arranged between the first perforated steel plates, wherein the second perforated steel plate is at least provided with one piece, and the first perforated steel plate and the second perforated steel plate are arranged in parallel.
Further, the hole of the second perforated steel plate is an anchoring hole with internal threads, and the steel rod is provided with external threads matched with the internal threads of the anchoring hole.
Further, the perforated steel plate is welded with the inner bottom plate of the steel box girder.
Further, a spacing of at least 60cm is reserved between the first perforated steel plate and the steel web of the steel box girder.
Further, the outer side of the steel bar is coated with fiber reinforced composite FRP.
The installation method of the steel-concrete combined section comprises the following steps:
step 1, pouring the steel-concrete combined box girder and welding the steel box girder;
step 2, inserting the welded steel box girder into the reinforced concrete combined box girder;
step 3, the steel bar passes through the steel-concrete combined box girder and the reserved hole of the steel box girder to connect and fix the steel-concrete combined box girder and the steel box girder, so that the assembly operation is completed;
and 4, coating the FRP composite material on the outer surface of the steel bar assembled in the step 3.
Further, the steel bar and the preformed hole are provided with matched threads, and the steel bar is connected with the preformed hole in a bolt connection mode.
By adopting the technical scheme, the following technical effects can be obtained:
1) The invention has simple structure and convenient installation, adopts factory prefabrication and field assembly, does not need field positioning and drilling, improves the construction efficiency, reserves enough operation space during prefabrication, is convenient for field assembly and maintenance in the future, and solves the problems of inconvenient field construction and high construction difficulty of the traditional transition section connection structure;
2) The steel bar used for connecting the steel box girder and the steel-concrete combined box girder not only can be used as a transverse prestress rib of the box girder, but also can play a role in transverse stiffening, and the capacity of cooperative stress of the steel-concrete joint part is further increased.
Drawings
FIG. 1 is a schematic view of the assembled structure of the reinforced concrete joint section of the present invention;
FIG. 2 is a schematic view of the structure of the steel-concrete joint section before assembly;
FIG. 3 is an enlarged view of FIG. 1 at A;
FIG. 4 is an enlarged view of a portion of the steel box girder and steel reinforced concrete composite box girder connection;
wherein:
the concrete box comprises a 1-steel-concrete combined box girder, 11-bolt supports, 111-first preformed holes, 112-prismatic table structures, 12-first steel webs, 13-first concrete top plates and 14-concrete bottom plates;
2-steel box girders, 21-perforated steel plates, 211-first perforated steel plates, 2111-second preformed holes, 212-second perforated steel plates, 2121-anchor holes, 22-second concrete top plates, 23-second steel webs, 24-steel bottom plates;
3-steel bars;
4-bolts.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the concrete combination section and the installation method thereof provided by the invention are detailed in the following.
As shown in fig. 1, the invention discloses a reinforced concrete combined section, which comprises a reinforced concrete combined box girder 1 and a reinforced concrete box girder 2 which are connected in an embedded manner, wherein the reinforced concrete combined box girder 1 and the reinforced concrete box girder 2 are provided with corresponding reserved holes and are fixedly connected through steel bars 3, specifically, firstly, the reinforced concrete combined box girder 1 is inserted with the reinforced concrete box girder 2, and then, the steel bars 3 are inserted into the reserved holes preset in the reinforced concrete combined box girder 1 and the reinforced concrete box girder 2 so as to connect the reinforced concrete combined box girder 1 and the reinforced concrete box girder 2 together.
As shown in fig. 2, the steel-concrete composite box girder 1 is composed of a first steel web 12, a first concrete top plate 13 and a concrete bottom plate 14, and further comprises bolt supports 11 arranged on the first concrete top plate 13 and the concrete bottom plate 14 of the steel-concrete composite box girder 1. The bolt support 11 is provided with a first preformed hole 111 along the width direction of the reinforced concrete composite box girder 1, and the first preformed hole 111 is a through hole, wherein the width direction of the reinforced concrete composite box girder 1 is the direction of a vertical line between two first steel webs 12. The aperture of the first preformed hole 111 is matched with the diameter of the steel rod 3, so that the steel rod 3 can be conveniently inserted, the first preformed hole 111 can play a fixing role by inserting the steel rod 3, the force can be conveniently transmitted, and the connecting force between the two can be increased.
As shown in fig. 4, at least four bolt supports 11 are arranged on the first concrete top plate 13 and the concrete bottom plate 14 of the reinforced concrete composite box girder, and the bolt supports 11 are distributed in a longitudinal and transverse arrangement mode and are distributed in an m×n arrangement mode, and each row of bolt supports 11 are arranged along the width direction of the reinforced concrete composite box girder 1. The arrangement of the multi-row bolt support 11 can further increase the binding force of the steel-concrete composite bridge connecting part.
Preferably, the joint of the bolt support 11 and the first concrete top plate 13 and the concrete bottom plate 14 of the reinforced concrete combined box girder 1 is a prismatic table structure 112, and as the bottom surface of the prismatic table structure 112 is larger than the top surface, i.e. trapezoidal transition is adopted between the bolt support 11 and the concrete top plate 13 and the concrete bottom plate 14, the problem of overlarge shear stress is effectively prevented.
As shown in fig. 2, the steel box girder 2 is composed of a second concrete top plate 22, a second steel web 23 and a steel bottom plate 24, and in order to further increase the connection force between the steel box girder 2 and the reinforced concrete composite box girder 1, one end of the steel box girder 2 is provided with an epitaxial perforated steel plate 21, and the perforated steel plate 21 is disposed along the length direction of the steel box girder 2, specifically, the length direction of the steel box girder 2 is a direction parallel to the second steel web 23. And the holes of the perforated steel plate 21 are matched with the steel bars 3, so that the steel bars 3 can be conveniently inserted into the perforated steel plate 21.
The perforated steel plate 21 includes a first perforated steel plate 211 provided on both sides and a second perforated steel plate 212 provided between the two first perforated steel plates 211, the second perforated steel plate 212 being provided with at least one, and the first perforated steel plate 211 and the second perforated steel plate 212 being provided in parallel. The arrangement of the plurality of perforated steel plates 21 can effectively increase the connection force between the steel box girder 2 and the reinforced concrete combined box girder 1, and the perforated steel plates 21 play the role of steel webs, so that the bending and shearing resistance of the joint of the box girders can be effectively improved.
Preferably, the hole of the second perforated steel plate 212 is an anchor hole 2121 with internal threads, and the steel rod 3 is provided with external threads matching the internal threads of the anchor hole 2121. The second perforated steel plate 212 and the anchor holes 2121 can be used for respectively anchoring the steel bar 3 into two sections, so that the steel bar 3 is prevented from being too long to construct. In addition, the threaded connection at the anchor hole 2121 further increases the connection force therebetween and the stability of the connection segment. The holes of the first perforated steel plate are second reserved holes 2111, and the steel rod 3 is anchored by bolts on the outer side of the first perforated steel plate after passing through the second reserved holes 2111.
Preferably, the perforated steel plate 21 is welded with the inner bottom plate of the steel box girder 2, so that the shearing stress between the perforated steel plate 21 and the structure of the steel box girder 2 can be effectively resisted, and the service life of the steel box girder 2 is prolonged.
Preferably, a space of at least 60cm is reserved between the first perforated steel plate 211 and the steel web of the steel box girder 2, so that a certain operation space is reserved for construction of workers, and the steel bars 3 can be conveniently assembled and anchored on site.
Preferably, the outer side of the steel rod 3 is coated with a fiber reinforced composite material FRP to improve the corrosion resistance of the steel rod 3 and to enhance the structural strength of the steel rod 3.
The invention also discloses an installation method of the reinforced concrete combination section, which comprises the following steps:
step 1, pouring a steel-concrete combined box girder 1 and welding a steel box girder 2, wherein the steel box girder can be prefabricated in a factory;
step 2, inserting the welded steel box girder 2 into the steel-concrete combined box girder 1;
step 3, penetrating the steel bar 3 through the reserved holes of the steel-concrete combined box girder 1 and the steel box girder 2 to connect and fix the steel-concrete combined box girder 1 and the steel box girder 2, and completing assembly operation;
and 4, coating the FRP composite material on the outer surface of the steel bar 3 assembled in the step 3.
Further, the steel bar 3 and the preformed hole are provided with matched threads, and the steel bar 3 and the preformed hole are connected in a bolt connection mode. The bolts 4 are used for anchoring at the outer side of the first perforated steel plate 211, and the connection force between the steel-concrete composite box girder 1 and the steel box girder 2 is further increased.
The steel-concrete combined section disclosed by the invention solves the problems of complex installation of the combined part and poor cooperative stress of the combined part of the traditional steel-concrete combined bridge, the steel bar 3 is adopted to connect the steel-concrete combined box girder 1 and the steel box girder 2, the connection force between the steel bar 3 and the steel box girder 2 is further increased in a bolt connection mode, the steel bar 3 is prevented from moving under the action of external force, so that the service life of the structure is shortened, in addition, the bolt support 11 is arranged on the first concrete top plate 13 and the concrete bottom plate 14 of the steel-concrete combined bridge, the steel box girder 2 is provided with the epitaxial perforated steel plate 21, the steel-concrete combined box girder 1 and the steel box girder 2 are creatively connected through the structure of the steel box girder 2, and the number of the bolt support 11 and the number of the perforated steel bars 3 can be adjusted according to actual conditions, such as the size of the box girder structure, so that the steel-concrete combined box girder 1 and the steel box girder 2 can meet actual requirements, the universality of the steel-concrete combined bridge is increased, the bolt support 11 and the perforated steel plate 21 can effectively resist the steel stress of the combined part of the steel-concrete combined box girder 1 and the steel box girder 2.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. The steel-concrete combined section is characterized by comprising a steel-concrete combined box girder (1) and a steel box girder (2) which are connected in an embedded manner, wherein the steel-concrete combined box girder (1) and the steel box girder (2) are provided with corresponding reserved holes and are fixedly connected through steel bars (3);
the steel-concrete combined box girder (1) comprises a bolt support (11) arranged on a first concrete top plate (13) and a concrete bottom plate (14) in the steel-concrete combined box girder (1), wherein the bolt support (11) is provided with a first reserved hole (111) along the width direction of the steel-concrete combined box girder (1), and the first reserved hole (111) is a through hole;
an epitaxial perforated steel plate (21) is arranged at one end part of the steel box girder (2), and the perforated steel plate (21) is arranged along the length direction of the steel box girder (2);
the diameter of the first reserved hole (111) is matched with the diameter of the steel rod (3), and the hole of the perforated steel plate (21) is matched with the steel rod (3) so that the steel rod (3) can be inserted into the first reserved hole (111) and the perforated steel plate (21).
2. The reinforced concrete joint section according to claim 1, wherein at least four bolt supports (11) are provided on each of the first concrete top plate (13) and the concrete bottom plate (14), and the bolt supports (11) are distributed in a crisscross arrangement.
3. The reinforced concrete joint according to claim 1, characterized in that the joint of the bolt support (11) with the first concrete top plate (13) and the concrete bottom plate (14) is a prismatic table structure (112).
4. The reinforced concrete bonding section according to claim 1, wherein said perforated steel sheet (21) comprises a first perforated steel sheet (211) provided on both sides and a second perforated steel sheet (212) provided between two of said first perforated steel sheets (211), said second perforated steel sheet (212) being provided with at least one piece, and said first perforated steel sheet (211) and said second perforated steel sheet (212) being arranged in parallel.
5. The reinforced concrete joint section according to claim 4, characterized in that the hole of the second perforated steel plate (212) is an internally threaded anchoring hole (2121), and the steel rod (3) is provided with external threads matching the internal threads of the anchoring hole (2121).
6. The reinforced concrete joint section according to claim 1, characterized in that the perforated steel plate (21) is welded to the inner bottom plate of the steel box girder (2).
7. The method of installing a reinforced concrete joint section according to claim 1, comprising the steps of:
step 1, pouring the steel-concrete combined box girder (1) and welding the steel box girder (2);
step 2, inserting the welded steel box girder (2) into the steel-concrete combined box girder (1);
step 3, penetrating the steel bar (3) through reserved holes of the steel-concrete combined box girder (1) and the steel box girder (2) to connect and fix the steel-concrete combined box girder (1) and the steel box girder (2) so as to finish assembly operation;
and 4, coating the FRP composite material on the outer surface of the steel bar (3) assembled in the step 3.
8. The method for installing the reinforced concrete joint section according to claim 7, wherein the steel bar (3) and the reserved hole are provided with matched threads, and the steel bar (3) and the reserved hole are connected in a bolt connection mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810556877.7A CN108729335B (en) | 2018-06-01 | 2018-06-01 | Steel-concrete combined section and installation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810556877.7A CN108729335B (en) | 2018-06-01 | 2018-06-01 | Steel-concrete combined section and installation method thereof |
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| CN108729335A CN108729335A (en) | 2018-11-02 |
| CN108729335B true CN108729335B (en) | 2023-08-22 |
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| CN105040568A (en) * | 2015-08-26 | 2015-11-11 | 长安大学 | Non-geocell steel-concrete joint section structure of hybrid girder bridge |
| CN105672113A (en) * | 2016-01-22 | 2016-06-15 | 山东大学 | Reinforced concrete combined part structure on lower flange of corrugated steel web and construction method of reinforced concrete combined part structure |
| CN208563079U (en) * | 2018-06-01 | 2019-03-01 | 景洪市橄榄坝至景哈乡澜沧江大桥建设指挥部 | Mix the steel reinforced concrete connecting structure of bridge |
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2018
- 2018-06-01 CN CN201810556877.7A patent/CN108729335B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050099657A (en) * | 2004-04-12 | 2005-10-17 | (주)석탑엔지니어링 | Installation structure for interior wall of box- typed segment structure |
| JP2008063803A (en) * | 2006-09-07 | 2008-03-21 | Jfe Engineering Kk | Composite floor slab formed of shape steel with inner rib, composite floor slab bridge, or composite girder bridge |
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