CN111549658A - Continuous bridge joint structure and continuous box girder bridge structure - Google Patents
Continuous bridge joint structure and continuous box girder bridge structure Download PDFInfo
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- CN111549658A CN111549658A CN202010480392.1A CN202010480392A CN111549658A CN 111549658 A CN111549658 A CN 111549658A CN 202010480392 A CN202010480392 A CN 202010480392A CN 111549658 A CN111549658 A CN 111549658A
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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
- E01D19/04—Bearings; Hinges
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
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Abstract
The invention relates to a continuous bridge joint structure and a continuous box girder bridge, comprising two prefabricated box girders and ultrahigh-performance concrete poured at the joint between the two prefabricated box girders; the method is characterized in that the top plates of two prefabricated box girders are connected at a continuous pier through cast-in-place ultrahigh-performance concrete to change a bridge structure from a simple support to a partial structure continuous state; the continuous box girder bridge structure adopts the continuous bridge joint structure. Compared with the prior art, the bridge pier top joint with the simple support-to-continuous structure is optimally designed, the joint only needs to be connected with the top plate, the complex process of jacking and dismantling after a temporary support is arranged is omitted, the construction difficulty is greatly reduced, the concrete volume poured in the construction site is reduced, and the construction efficiency of the joint and the economical efficiency of bridge construction are improved.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a continuous bridge joint structure and a continuous box girder bridge structure.
Background
The conventional simply supported continuous structure system bridge relates to system conversion during construction, a temporary support is arranged on the top of a continuous pier firstly, and the temporary support is removed and converted into a permanent support after the bridge is converted into a continuous structure system. In addition, cast-in-place common concrete is usually adopted at the joint of the continuous pier top, the casting square amount is large, the on-site steel bar welding workload is large, the construction process is relatively complicated, and the construction period is relatively long.
In order to improve the joint performance and the construction efficiency, ultra-high performance concrete (UHPC) is applied to the bridge joint, but the UHPC has higher unit price at present, the beam height is larger for the common box girder section with the whole hole span larger than 50m, the square amount of full-section pouring at the joint is larger, and the manufacturing cost is higher.
Chinese patent CN108316132A discloses a simply supported becomes continuous bridge structures structure, sets up one section precast beam respectively in continuous mound top both sides, is equipped with interval, its characterized in that between the precast beam's of both sides beam-ends face: and on the continuous pier top of the simple support-to-continuous structure, only the top plate and the bottom plate of the two sections of precast beams are connected, and the abdomen part of the beam body is not connected, so that the conversion from the simple support state to the continuous state is formed. The patent technology is used for a small box girder bridge with a plurality of transverse main girders with small span, the live load bending moment ratio is relatively high, the stress requirement cannot be met only by bending resistance of a top plate, the moment is formed by tension of the top plate and compression of a bottom plate so as to resist the fulcrum negative bending moment, and therefore the stress requirement can be met only by connecting the top plate and the bottom plate of a precast beam. In addition, the connection structure of this patent technology is plate-shaped structure, and the joint connection intensity is relatively weak, and the construction is relatively complicated.
Disclosure of Invention
The invention aims to provide a continuous bridge joint structure and a continuous box girder bridge structure in order to overcome the defects of large concrete pouring volume, high construction difficulty and low construction efficiency in the prior art. The invention provides a continuous bridge joint structure adopting a partial structure of cast-in-place ultrahigh-performance concrete, which is characterized in that through the use of UHPC, the pier top joint of the traditional simply-supported continuous structure bridge is optimally designed to the greatest extent on the premise of ensuring the stress performance of the joint, so that the purposes of simplifying construction and improving construction efficiency and economy are achieved, and the invention also correspondingly provides a continuous box girder bridge with a partial structure obtained by utilizing the joint structure.
The purpose of the invention can be realized by the following technical scheme:
a continuous bridge joint structure comprises two prefabricated box girders and ultrahigh-performance concrete poured at a joint between the two prefabricated box girders; the method is characterized in that the top plates of two prefabricated box girders are connected at the continuous piers through cast-in-place ultrahigh-performance concrete, so that the bridge structure is changed from a simple support to a partial structure continuous state.
In the simply supported variable continuous bridge, when the span is increased, the proportion of the self weight of the structure to the design load is obviously increased, the proportion of the second-stage dead load and the live load is lower, and the pier top joint basically only bears the second-stage dead load, the live load of an automobile and the hogging moment possibly generated by other loads; based on the analysis, the invention optimally designs the simple support-to-continuous bridge pier top joint, thereby simplifying construction and improving construction efficiency and economy.
Compared with the prior art, the invention is mainly suitable for the whole-hole large box girder with the span of more than 50m, the proportion of the self weight of the structure to the total load is high, the live load bending moment of the pier top is relatively small, the part of the negative bending moment can be borne through the local structural connection of the top plate, the volume of the cast-in-place concrete is less, and the construction is rapid; the joint of the invention is of a T-shaped structure, and the contact surface between the cast-in-place UHPC joint and the precast beam section is increased by arranging the L-shaped notch on the precast box beam top plate, so that the internal force transition of the beam section is smooth, the connection strength is improved, and the cast-in-place square amount of concrete is further reduced while the structural performance is ensured.
Furthermore, a notch is formed in the intersection of the end face and the upper surface of the top plate of the prefabricated box girder, and a pouring space for pouring the ultra-high performance concrete is formed by the notches of the two prefabricated box girders and the end face of the top plate.
Further, the notch is L-shaped, and the pouring space is of a T-shaped structure.
Further, the distance between the end faces of the top plates of the two precast box girders is 30-90 cm.
Further, along the longitudinal direction of continuous bridge, the width of pouring space is 2 ~ 4 times, preferably 3 times of the interval between the roof terminal surface of two precast box girders.
Further, the end part of the top plate of the precast box girder is a plate-shaped structure with uniform thickness, the height of the casting space is the same as the thickness of the plate-shaped structure at the end part of the top plate, and the height of the casting space in the transverse direction of the continuous bridge is kept unchanged.
Further, the height of the notch of the top plate is one fourth to one third of the height of the pouring space and is not less than 20 cm.
Further, the prefabricated box girder is a prefabricated whole-hole box girder.
The construction method of the continuous bridge joint structure comprises the following steps:
(S-1) prefabricating a whole-hole box girder in a factory;
(S-2) transporting the prefabricated box girder to a bridge site, placing two rows of permanent supports in the longitudinal direction of the continuous pier top bridge, hoisting to enable the prefabricated whole-hole box girder to be in a simple support state, and installing a template with a cast-in-situ UHPC joint between a groove opening and the end face of a top plate of the prefabricated box girder;
(S-3) binding steel bars at the joint, installing a top plate prestressed pipeline and pouring mixed UHPC into a joint template after steel bar penetration;
and (S-4) maintaining the UHPC, and after the joint UHPC reaches the strength, removing the template and tensioning the top plate prestressed bundles to complete construction.
The invention also provides a continuous box girder bridge structure adopting the continuous bridge joint structure.
Further, two rows of permanent supports are arranged at the top of the continuous pier along the longitudinal direction of the continuous bridge, and the precast box girder is supported by the permanent supports in a simply supported state.
Furthermore, both ends of the precast box girder are provided with end cross beams.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, by adopting the ultra-high performance concrete (UHPC) and utilizing the excellent mechanical properties of the UHPC, the pier top joint structure of the traditional simply supported-to-continuous bridge is simplified, the complicated process of jacking and dismantling after a temporary support is arranged is omitted, and only the top plate is connected on the basis of the simply supported beam to form a partial structure continuous bridge, so that the advantages of the traditional simply supported-to-continuous bridge are retained, meanwhile, the structure is simple, and the construction difficulty is greatly reduced;
(2) the joint only needs to be connected with the top plate, the volume of concrete poured in the construction site is greatly reduced, and the UHPC and the reinforcing steel bar have good anchoring performance, so that the arrangement of the reinforcing steel bar can be simplified, and the economy is better;
(3) the notch is arranged at the top plate of the prefabricated whole-hole box girder, so that the contact surface of the UHPC and the prefabricated girder section is increased, the connection strength is improved, and the stress on the joint is facilitated;
(4) due to the fact that the UHPC has the early strength characteristic, the prestress can be tensioned 1-5 days after pouring generally, and the joint construction efficiency can be greatly improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a cross-sectional view taken at C-C of FIG. 2;
FIG. 6 is a cross-sectional view taken at D-D in FIG. 2;
in the figure, 1 is a prefabricated box girder, 2 is a notch, 3 is ultra-high performance concrete, 4 is a support center line, 5 is a manhole, 6 is a permanent support, h1 is the height of a pouring space, h2 is the height of the notch, L1 is the distance between the end faces of the top plates of the two prefabricated box girders, and L2 is the width of the pouring space.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
A continuous bridge joint structure is a bridge joint structure adopting cast-in-place ultrahigh-performance concrete and continuous in partial structure, and comprises two prefabricated whole-hole box girders 1 and ultrahigh-performance concrete 3 poured at joints between the two prefabricated box girders 1, wherein the two prefabricated box girders 1 are arranged at intervals at continuous piers, the ultrahigh-performance concrete 3 is cast in place between top plates of the prefabricated box girders 1, namely only the top plates of the two prefabricated box girders 1 are connected at the continuous piers, so that the bridge structure is changed from a simple support to a partial structure continuous state, the prefabricated box girders 1 in the embodiment are prefabricated whole-hole large box girders, the prefabricated box girders 1 comprise top plates, middle beam body abdomens and bottom plates, and the bottom plates of the two prefabricated box girders 1 are provided with intervals. It should be specifically noted here that the ultra-high performance concrete (UHPC) has excellent mechanical properties, and has a higher bonding strength with the interface of ordinary concrete, and better anchoring performance with steel bars than ordinary concrete. Therefore, the joint design can be optimized to the greatest extent when the joint is used in a continuous pier top joint structure, only the top plate is connected on the basis of the simply supported beam to form a continuous bridge with a partial structure, the construction steps are simplified, the cast-in-place volume of concrete is greatly reduced, the construction difficulty is reduced, and the construction efficiency is improved.
As shown in fig. 1 and 2, a notch 2 is arranged at an intersection of an end surface and an upper surface of a top plate of each prefabricated box girder 1, the structure of the notch is L-shaped, and the notches 2 of the two prefabricated box girders 1 and the end surface of the top plate form a casting space for casting ultrahigh-performance concrete, wherein the casting space in this embodiment is a T-shaped structure. The contact surface of UHPC and precast beam section has been increased in the setting of this notch 2, can smooth-going transition beam section internal force, has improved joint strength, is favorable to seam department atress. In the embodiment, the distance L1 between the end faces of the top plates of the two prefabricated box girders is 60 cm; along the longitudinal direction of the continuous bridge, the width L2 of the pouring space is 2 times of the distance L1 between the end faces of the top plates of the two precast box girders.
As shown in fig. 1, 2, 3 and 4, it can be seen that the end of the top slab of the precast box girder 1 is a plate-shaped structure having a uniform thickness, the height h1 of the casting space is the same as the thickness of the plate-shaped structure of the end of the top slab, and the height h1 of the casting space in the lateral direction of the continuous bridge is maintained constant; the height h2 of the notch of the top plate in the embodiment is one third of the height h1 of the casting space and is not less than 20 cm. As shown in fig. 5, the notch 2 is arranged along the width direction of the precast box girder and is a through notch.
In this embodiment, the prefabricated box girder is a prefabricated whole-hole big box girder, and a manhole 5 is arranged at the end part close to the prefabricated box girder 1.
The construction method of the continuous bridge joint structure comprises the following steps:
(S-1) prefabricating a whole-hole big box girder in a factory, and storing for 3 months;
(S-2) transporting the prefabricated beam sections to a bridge site, placing two rows of permanent supports 6 in the top longitudinal direction of the continuous pier, hoisting the prefabricated whole-hole box girder with each hole on the corresponding support 6, forming a simply supported state by using the support center line 4 of the prefabricated whole-hole box girder as shown in figure 1, and installing a template of a cast-in-situ ultrahigh-performance concrete (UHPC) joint between the groove opening and the end surface of the top plate of the prefabricated box girder after the beam sections are in place;
(S-3) binding steel bars at the joint, installing a top plate prestressed pipeline and pouring mixed ultra-high performance concrete (UHPC) into the joint template after the steel bars are penetrated;
and (S-4) maintaining the ultra-high performance concrete (UHPC), and after the strength of the joint ultra-high performance concrete (UHPC) is reached, removing the template and tensioning the top plate prestressed bundles to complete construction.
The joint structure is simple in construction process, and by adopting the technical scheme, the pier top joint structure of the traditional simply supported-to-continuous bridge is simplified, the construction difficulty is greatly reduced, and the construction efficiency and the economical efficiency are improved.
The continuous bridge joint structure optimizes the joint of the pier tops of the traditional simply-supported bridge with the continuous structure, the joint only needs to be connected with the top plate, the complex process of jacking and dismantling after the temporary support is arranged is omitted, the construction difficulty is greatly reduced, the concrete volume poured in the construction site is reduced, and the construction efficiency of the joint and the economical efficiency of bridge construction are improved.
In the continuous box girder bridge structure adopting the continuous bridge joint structure, as shown in fig. 6, two rows of permanent supports 6 are arranged at the top of the continuous pier along the longitudinal direction of the continuous bridge, the supports of the prefabricated box girder 1 in a simply supported state are the permanent supports 6, the prefabricated box girder 1 is designed according to the simply supported girder, and end cross beams are arranged at two ends of the prefabricated box girder.
Example 2
A continuous bridge joint structure is a continuous bridge joint structure adopting a partial structure of cast-in-place ultrahigh-performance concrete, and comprises two prefabricated box girders 1 and ultrahigh-performance concrete 3 poured at the joint between the two prefabricated box girders 1, wherein the two prefabricated box girders 1 are arranged at intervals at a continuous pier, and the bridge structure is changed from a simple support to a partial structure continuous state by casting the ultrahigh-performance concrete 3 between the top plates of the prefabricated box girders 1, namely only connecting the top plates of the two prefabricated box girders 1 at the continuous pier. As shown in fig. 1 and 2, a notch 2 is formed at an intersection of an end surface and an upper surface of a top plate of each prefabricated box girder 1, and the notches 2 of the two prefabricated box girders 1 and the end surface of the top plate form a casting space for casting ultra-high performance concrete, wherein the casting space is a T-shaped structure in this embodiment. The contact surface of UHPC and precast beam section has been increased in the setting of this notch 2, can smooth-going transition beam section internal force, has improved joint strength, is favorable to seam department atress. In the embodiment, the distance L1 between the end faces of the top plates of the two prefabricated box girders is 30 cm; along the longitudinal direction of the continuous bridge, the width L2 of the pouring space is 4 times of the distance L1 between the end faces of the top plates of the two precast box girders.
As shown in fig. 1, 2, 3 and 4, it can be seen that the end of the top slab of the precast box girder 1 is a plate-shaped structure having a uniform thickness, the height h1 of the casting space is the same as the thickness of the plate-shaped structure of the end of the top slab, and the height h1 of the casting space in the lateral direction of the continuous bridge is maintained constant; the height h2 of the notch of the top plate in the embodiment is one third of the height h1 of the casting space and is not less than 20 cm.
Example 3
A continuous bridge joint structure is a continuous bridge joint structure adopting a partial structure of cast-in-place ultrahigh-performance concrete, and comprises two prefabricated box girders 1 and ultrahigh-performance concrete 3 poured at the joint between the two prefabricated box girders 1, wherein the two prefabricated box girders 1 are arranged at intervals at a continuous pier, and the bridge structure is changed from a simple support to a partial structure continuous state by casting the ultrahigh-performance concrete 3 between the top plates of the prefabricated box girders 1, namely only connecting the top plates of the two prefabricated box girders 1 at the continuous pier. As shown in fig. 1 and 2, a notch 2 is formed at an intersection of an end surface and an upper surface of a top plate of each prefabricated box girder 1, and the notches 2 of the two prefabricated box girders 1 and the end surface of the top plate form a casting space for casting ultra-high performance concrete, wherein the casting space is a T-shaped structure in this embodiment. The contact surface of UHPC and precast beam section has been increased in the setting of this notch 2, can smooth-going transition beam section internal force, has improved joint strength, is favorable to seam department atress. In the embodiment, the distance L1 between the end faces of the top plates of the two prefabricated box girders is 90 cm; along the longitudinal direction of the continuous bridge, the width L2 of the pouring space is 4 times of the distance L1 between the end faces of the top plates of the two precast box girders.
As shown in fig. 1, 2, 3 and 4, it can be seen that the end of the top slab of the precast box girder 1 is a plate-shaped structure having a uniform thickness, the height h1 of the casting space is the same as the thickness of the plate-shaped structure of the end of the top slab, and the height h1 of the casting space in the lateral direction of the continuous bridge is maintained constant; the height h2 of the notch of the top plate in this embodiment is one fourth of the height h1 of the casting space and is not less than 20 cm.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A continuous bridge joint structure comprises two prefabricated box girders (1) and ultrahigh-performance concrete (3) poured at a joint between the two prefabricated box girders (1); the method is characterized in that the top plates of two prefabricated box girders (1) are connected through cast-in-place ultrahigh-performance concrete (3) at the continuous piers to realize that the bridge structure is changed from a simple support to a partial structure continuous state.
2. A continuous bridge joint structure according to claim 1, characterized in that the intersection of the end face and the upper surface of the top plate of the prefabricated box girder (1) is provided with a notch (2), and the notches (2) of the two prefabricated box girders (1) and the end face of the top plate form a casting space for casting the ultra-high performance concrete (3).
3. The continuous bridge joint construction of claim 2, wherein the notch is L-shaped and the casting space is T-shaped.
4. A continuous bridge joint construction according to claim 2, wherein the distance (L1) between the end faces of the top plates of two prefabricated box girders is 30-90 cm.
5. A continuous bridge joint construction according to claim 2, characterized in that the width (L2) of the casting space is 2-4 times, preferably 3 times, the distance (L1) between the end faces of the top plates of two precast box girders in the longitudinal direction of the continuous bridge.
6. A continuous bridge joint construction according to claim 2, characterized in that the end of the top plate of the precast box girder (1) is a plate-like structure of uniform thickness, the height (h1) of the casting space is the same as the thickness of the plate-like structure of the end of the top plate, and the height (h1) of the casting space is kept constant in the transverse direction of the continuous bridge.
7. A continuous bridge joint construction according to claim 1, characterized in that the height (h2) of the notch of the roof slab is one quarter to one third of the height (h1) of the casting space and is not less than 20 cm.
8. A continuous box girder bridge structure constructed using the continuous bridge joint of claim 1.
9. A continuous box girder bridge construction according to claim 8, characterized in that the tops of the continuous piers are provided with two rows of permanent bearings (6) in the longitudinal direction of the continuous bridge, and the precast box girders (1) are supported with the permanent bearings (6) in a simply supported state.
10. A continuous box girder bridge construction according to claim 8, characterized in that the precast box girders (1) are provided with end cross beams at both ends.
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| CN202010480392.1A CN111549658A (en) | 2020-05-30 | 2020-05-30 | Continuous bridge joint structure and continuous box girder bridge structure |
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| CN202010480392.1A CN111549658A (en) | 2020-05-30 | 2020-05-30 | Continuous bridge joint structure and continuous box girder bridge structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111877182A (en) * | 2020-09-03 | 2020-11-03 | 广东省建筑设计研究院有限公司 | Novel construction method for upper structure of multi-chamber continuous UHPC box girder bridge |
| CN112064518A (en) * | 2020-08-21 | 2020-12-11 | 温州融宸科技有限公司 | Bridge pier combination swivel support |
| CN115404762A (en) * | 2022-10-10 | 2022-11-29 | 上海市政工程设计研究总院（集团）有限公司 | Pier top longitudinal continuous structure of assembled beam bridge and construction method thereof |
| CN115928558A (en) * | 2023-02-21 | 2023-04-07 | 湖南大学 | Transverse joint structure of UHPC combined box girder and construction method thereof |
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2020
- 2020-05-30 CN CN202010480392.1A patent/CN111549658A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064518A (en) * | 2020-08-21 | 2020-12-11 | 温州融宸科技有限公司 | Bridge pier combination swivel support |
| CN112064518B (en) * | 2020-08-21 | 2022-06-10 | 中建协和建设有限公司 | Bridge pier combination swivel support |
| CN111877182A (en) * | 2020-09-03 | 2020-11-03 | 广东省建筑设计研究院有限公司 | Novel construction method for upper structure of multi-chamber continuous UHPC box girder bridge |
| CN111877182B (en) * | 2020-09-03 | 2021-09-14 | 广东省建筑设计研究院有限公司 | Novel construction method for upper structure of multi-chamber continuous UHPC box girder bridge |
| CN115404762A (en) * | 2022-10-10 | 2022-11-29 | 上海市政工程设计研究总院（集团）有限公司 | Pier top longitudinal continuous structure of assembled beam bridge and construction method thereof |
| CN115928558A (en) * | 2023-02-21 | 2023-04-07 | 湖南大学 | Transverse joint structure of UHPC combined box girder and construction method thereof |
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