CN112391931A - Assembly type continuous T-beam bridge splicing section adopting UHPC shear keys and construction method - Google Patents
Assembly type continuous T-beam bridge splicing section adopting UHPC shear keys and construction method Download PDFInfo
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- CN112391931A CN112391931A CN202011184605.2A CN202011184605A CN112391931A CN 112391931 A CN112391931 A CN 112391931A CN 202011184605 A CN202011184605 A CN 202011184605A CN 112391931 A CN112391931 A CN 112391931A
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- prefabricated
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- performance concrete
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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
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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
- E01D19/00—Structural or constructional details of bridges
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention relates to an assembled continuous T-beam bridge splicing section adopting UHPC shear keys and a construction method, wherein the T-beam bridge splicing section at the pier top consists of a prefabricated T-beam, UHPC prefabricated plates and UHPC cast-in-place plates, the prefabricated plates are connected through transverse prestressed steel bars, the cast-in-place plates are positioned right above the prefabricated plates and connected through combined surface steel bars, both ends of a top plate of the prefabricated T-beam are provided with recessed shear key positions, the top surface of the top plate is provided with pre-embedded combined surface steel bars, and the cast-in-place plates and the prefabricated T-beam are connected through the UHPC shear keys, the combined surface steel bars and the longitudinal prestressed steel bars. Shear keys made of UHPC are arranged at the splicing sections of the continuous T-beam bridge, so that the shear resistance of the splicing sections is improved. And UHPC is adopted in a hogging moment area of the continuous beam bridge for bearing, so that the structural stress is more reasonable. By adopting the construction scheme of factory prefabrication and field assembly, the defect that the construction precision of cast-in-place is difficult to achieve due to the fact that a large amount of cast-in-place is carried out and the structure is complex in the prior art is avoided.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to an assembled continuous T-beam bridge splicing section adopting UHPC shear keys and a construction method.
Background
In the construction process of the continuous T-beam bridge, a construction method of simply supporting first and then continuously is usually adopted, namely, in the construction process of the bridge, the T-beam is firstly placed on a temporary support arranged on a pier in the form of the simply supported beam, gaps between the T-beams with different spans in the longitudinal direction of the bridge are filled with cast-in-place concrete, prestressed steel bars on a top plate are tensioned, and the arranged temporary support is removed to form a continuous T-beam bridge structure in the longitudinal direction of the bridge. For the continuous T-beam bridge formed by the construction method, the binding quality of the reinforcing steel bars and the construction quality of the cast-in-place section concrete are generally difficult to ensure because the gaps among the T-beams are narrow. Meanwhile, the bending moment area is positioned at the pier top and is a hogging moment area of the continuous T-beam bridge, bears complex hogging moment action and shearing force action and is a key position for bearing the stress of the continuous T-beam bridge. The stress performance and the construction quality of the continuous T-beam bridge region are improved, and the method is very important for improving the stress performance of the continuous T-beam bridge and ensuring the structural safety of the continuous T-beam bridge. Therefore, in order to solve the technical problems, the invention provides an assembled continuous T-beam bridge splicing section adopting UHPC shear keys and a construction method.
Disclosure of Invention
The invention provides an assembled continuous T-beam bridge splicing section adopting a UHPC shear key and a construction method thereof, aiming at improving the stress performance of a continuous T-beam bridge and ensuring the structural safety of the continuous T-beam bridge, in particular to the stress performance of a cast-in-place continuous section.
An assembled continuous T-beam bridge splicing section adopting UHPC shear keys, the T-beam bridge splicing section at the pier top consists of a prefabricated T-beam, ultra-high performance concrete precast slabs and ultra-high performance concrete cast-in-place slabs, a plurality of ultra-high performance concrete precast slabs are connected through transverse prestressed steel bars, the top edge of the ultra-high performance concrete precast slab is pre-embedded with joint face steel bars, the ultra-high performance concrete cast-in-place slab is positioned right above the ultra-high performance concrete precast slab and is connected through the joint face steel bars, the prefabricated T-beam comprises a top plate, a super high performance concrete cast-in-place plate, a prefabricated T-beam, a common concrete prefabricated plate and a beam rib, wherein the two ends of the top plate of the prefabricated T-beam are provided with sunken shear key positions, the top surface of the top plate is provided with embedded joint face reinforcing steel bars, the super high performance concrete cast-in-place plate and the prefabricated T-beam are connected.
Furthermore, the ultra-high performance concrete precast slab is replaced by a common concrete precast slab.
Furthermore, the beam rib of the prefabricated T-beam is provided with a clamping groove for mounting the ultra-high performance concrete precast slab, the upper surface and the lower surface of the ultra-high performance concrete precast slab are provided with mounting clamping grooves, and the prefabricated T-beam and the ultra-high performance concrete precast slab are clamped through the clamping grooves.
A construction method of an assembled continuous T-beam bridge splicing section adopting UHPC shear keys comprises the following steps:
and 5, pouring concrete of the ultrahigh-performance concrete cast-in-place plate into the template, maintaining, and stretching to manufacture longitudinal prestressed steel bars at the top plate of the prefabricated T beam after the strength is achieved.
Has the advantages that: the invention provides an assembled continuous T-beam bridge splicing section adopting UHPC shear keys and a construction method. Shear keys made of UHPC are arranged at the splicing sections of the continuous T-beam bridge, so that the shear resistance of the splicing sections is improved. By adopting the ultra-high performance concrete with extremely outstanding material performance to bear in the hogging moment area of the continuous beam bridge, the structural stress is more reasonable. And the construction scheme of factory prefabrication and field assembly is adopted as far as possible, so that the defect that the construction precision of field pouring is difficult to achieve due to the fact that a large amount of cast-in-place is required at the pier top and the structure is complex in the original common continuous T-beam bridge is overcome.
Drawings
FIG. 1 is an elevational view of a spliced section of a T-beam bridge of the present invention;
FIG. 2 is a detailed view of the combined surface of the prefabricated T-beam and the ultra-high performance concrete cast-in-place slab;
FIG. 3 is a detailed view of the combination surface of the ultra-high performance concrete cast-in-place slab and the ultra-high performance concrete precast slab of the present invention;
FIG. 4 is a detailed view of the combination surface of the ultra-high performance concrete precast slab and the precast T-beam rib of the present invention.
In the figure: 1. the prefabricated T-beam, 2, the ultra-high performance concrete precast slab, 3, the ultra-high performance concrete cast-in-place slab, 4, a UHPC shear key, 5, a joint face steel bar, 6, a transverse prestressed steel bar, 7 and a clamping groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, in the splicing section of the assembled continuous T-beam bridge using the UHPC shear keys, the prefabricated T-beam 1, the ultra-high performance concrete (UHPC) prefabricated slab 2 and the ultra-high performance concrete cast-in-place slab 3 form the splicing section of the T-beam bridge at the pier top, the UHPC prefabricated slab and the UHPC cast-in-place slab at the pier top are connected through a joint surface steel bar 5, the common concrete prefabricated slab and the beam rib of the prefabricated T-beam 1 at the pier top are connected through a longitudinal prestressed steel bar, and the UHPC cast-in-place slab and the top plate of the prefabricated T-beam 1 at the pier top are connected through the UHPC shear keys 4, the joint surface steel bar 5 and the longitudinal prestressed steel bar. The ultra-high performance concrete cast-in-place slab 3 is positioned right above the ultra-high performance concrete precast slabs 2, and a plurality of UHPC precast slabs are connected through transverse prestressed steel bars 6. And the top edge of the UHPC precast slab at the pier top is provided with a pre-embedded joint surface steel bar 5. And both ends of the top plate of the prefabricated T-shaped beam 1 are provided with a sunken shear key position and a pre-embedded joint surface reinforcing steel bar 5.
The UHPC precast slabs at the pier tops can also adopt a plurality of common concrete precast slabs as well as a plurality of UHPC precast slabs at the pier tops, and the bearing capacity requirement at the pier tops is determined.
And the prefabricated T-beam 1 is characterized in that a clamping groove 7 for mounting a UHPC prefabricated plate is arranged at a beam rib of the prefabricated T-beam. And the upper surface and the lower surface of the prefabricated UHPC plate are provided with clamping grooves for mounting the UHPC prefabricated plate. The clamping grooves at the prefabricated T-beam rib and the clamping grooves on the upper surface and the lower surface of the UHPC plate can be spliced together.
In this example, the UHPC precast slab has a height H1 and a length L1. The thickness of the UHPC cast-in-place slab is H2, and the length of the UHPC cast-in-place slab is L2.
As shown in fig. 1 to 3, a construction method of an assembled continuous T-beam bridge splicing section using UHPC shear keys is performed according to the following steps:
(1) and prefabricating the T-beam and the ultra-high performance concrete precast slab 2 in a factory. Both ends of a top plate of the prefabricated T beam 1 are provided with a concave shear key position and a pre-embedded joint surface steel bar;
(2) arranging temporary supports on the piers, and installing prefabricated T-shaped beams 1;
(3) installing UHPC precast slabs along the clamping grooves 7 at the beam rib of the prefabricated T beam, and tensioning the longitudinal prestress at the beam rib and the transverse prestress of a plurality of UHPC precast slabs;
(4) installing a template of the UHPC cast-in-place plate, and binding reinforcing steel bars of the UHPC cast-in-place plate in the template;
(5) and pouring concrete of the ultrahigh-performance concrete cast-in-place plate into the template, maintaining, and stretching the longitudinal prestressed steel bars at the top plate of the prefabricated T beam after the strength is reached.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (4)
1. An assembled continuous T-shaped beam bridge splicing section adopting UHPC shear keys is characterized in that, the T-beam bridge consists of a prefabricated T-beam, ultra-high performance concrete precast slabs and ultra-high performance concrete cast-in-place slabs at the pier top splicing section, a plurality of ultra-high performance concrete precast slabs are connected through transverse prestressed steel bars, the top edge of the ultra-high performance concrete precast slab is pre-embedded with joint face steel bars, the ultra-high performance concrete cast-in-place slab is positioned right above the ultra-high performance concrete precast slab and is connected through the joint face steel bars, the prefabricated T-beam comprises a top plate, a super high performance concrete cast-in-place plate, a prefabricated T-beam, a common concrete prefabricated plate and a beam rib, wherein the two ends of the top plate of the prefabricated T-beam are provided with sunken shear key positions, the top surface of the top plate is provided with embedded joint face reinforcing steel bars, the super high performance concrete cast-in-place plate and the prefabricated T-beam are connected.
2. The assembled continuous T-beam bridge splicing section adopting the UHPC shear key according to claim 1, wherein: the ultra-high performance concrete precast slab is replaced by a common concrete precast slab.
3. The assembled continuous T-beam bridge splicing section adopting the UHPC shear key according to claim 1, wherein: the prefabricated T-beam is characterized in that clamping grooves for mounting the ultra-high performance concrete precast slabs are formed in beam ribs of the prefabricated T-beam, mounting clamping grooves are formed in the upper surface and the lower surface of each ultra-high performance concrete precast slab, and the prefabricated T-beam and the ultra-high performance concrete precast slabs are clamped through the clamping grooves.
4. A construction method for an assembled continuous T-beam bridge splicing section using UHPC shear keys according to any one of claims 1 to 3, comprising the steps of:
step 1, prefabricating a T-beam and an ultra-high performance concrete precast slab at a splicing section of a T-beam bridge in a factory;
step 2, arranging temporary supports on the piers and installing prefabricated T-shaped beams;
step 3, mounting the ultra-high performance concrete precast slabs along the clamping grooves at the prefabricated T-beam rib, and tensioning longitudinal prestressed steel bars at the prefabricated T-beam rib and transverse prestressed steel bars of the plurality of ultra-high performance concrete precast slabs;
step 4, installing a template of the ultra-high performance concrete cast-in-place slab, and binding reinforcing steel bars in the template;
and 5, pouring concrete of the ultrahigh-performance concrete cast-in-place plate into the template, maintaining, and stretching to manufacture longitudinal prestressed steel bars at the top plate of the prefabricated T beam after the strength is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011184605.2A CN112391931A (en) | 2020-10-30 | 2020-10-30 | Assembly type continuous T-beam bridge splicing section adopting UHPC shear keys and construction method |
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| CN202011184605.2A CN112391931A (en) | 2020-10-30 | 2020-10-30 | Assembly type continuous T-beam bridge splicing section adopting UHPC shear keys and construction method |
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| CN108060738A (en) * | 2017-12-20 | 2018-05-22 | 东南大学 | A kind of prefabricated T plate structure of post-tensioned prestressing segmented assembly and assembling method |
| CN108385505A (en) * | 2018-05-11 | 2018-08-10 | 湖南省交通规划勘察设计院有限公司 | A kind of seam system and its construction method, box girder bridge for UHPC precast segment box beams |
| CN110863417A (en) * | 2019-10-28 | 2020-03-06 | 上海市政工程设计研究总院（集团）有限公司 | Steel-concrete combined beam bridge capable of being installed quickly and construction method thereof |
| CN111455806A (en) * | 2020-04-17 | 2020-07-28 | 浙江省交通规划设计研究院有限公司 | Prestressed concrete beam hogging moment area bridge structure and construction method thereof |
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2020
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| JP2003213623A (en) * | 2002-01-25 | 2003-07-30 | Taisei Corp | Upper structure of ridge |
| KR20090126493A (en) * | 2008-06-04 | 2009-12-09 | 아주대학교산학협력단 | Precast concrete girder |
| KR101267807B1 (en) * | 2012-10-04 | 2013-06-04 | 한국건설기술연구원 | Large scale concrete girder, and manufacturing method by using uhpc member as a form and structural element |
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Application publication date: 20210223 |