CN111764283B - Rapid circulating construction method for upper structure of composite beam cable-stayed bridge - Google Patents
Rapid circulating construction method for upper structure of composite beam cable-stayed bridge Download PDFInfo
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- CN111764283B CN111764283B CN202010453867.8A CN202010453867A CN111764283B CN 111764283 B CN111764283 B CN 111764283B CN 202010453867 A CN202010453867 A CN 202010453867A CN 111764283 B CN111764283 B CN 111764283B
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed 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
- E01D21/10—Cantilevered erection
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention provides a quick circulating construction method for an upper structure of a composite beam cable-stayed bridge, which comprises the steps of continuously hoisting the front 4 steel beam sections of a main beam cantilever, installing a bridge deck on each beam section during the connection period, moving a bridge deck crane forwards to the front-end beam section, pouring wet joints of the bridge decks of the other 3 beam sections at one time, and tensioning a cable-stayed cable for 3 beam sections in a reverse sequence for two times; and then 3 beam sections are constructed each time according to the method until the cantilever beam sections are completely installed. Compared with the existing section-by-section installation method, the construction progress can be improved, and compared with the existing method for simultaneously pouring wet joints of all beam sections and sequentially tensioning the stay cables, the method can avoid the cracking risk of the bridge deck and the wet joints, save the cost and ensure the construction quality.
Description
Technical Field
The invention belongs to the technical field of bridge construction, relates to construction of an upper structure of a composite beam cable-stayed bridge, and particularly relates to a rapid circulating construction method of the upper structure of the composite beam cable-stayed bridge.
Background
The main beam of the superposed beam cable-stayed bridge mainly comprises a steel beam and a concrete bridge deck paved on the top surface of the steel beam, and the steel beam and the bridge deck are connected through a shear connector to form a stressed whole. The steel beam can be used as a construction framework and a permanent bearing member, and the concrete bridge deck can replace an orthotropic steel bridge deck in an expensive all-steel main beam type, so that the superposed beam has more economical efficiency compared with a common steel structure bridge deck system, and has faster construction speed compared with the concrete main beam.
The steel beams of the superposed beam cable-stayed bridge are installed and connected in a segmented mode, the concrete bridge deck is prefabricated in a segmented mode, after the steel beams are paved, wet joint concrete is poured between adjacent bridge deck plates, and the stay cables are installed and tensioned. According to the occasion of pouring the wet joints of the bridge deck slab, the common construction method of the upper structure of the existing large-span superposed beam cable-stayed bridge comprises the following steps: (1) after each steel beam segment is installed, paving a bridge deck on the segment, and pouring wet joint concrete to be strong; (2) after all the section steel beams are installed, the wet joints of the bridge deck on the steel beams are poured at the same time and are to be strengthened, and the stay cable construction is sequentially installed and tensioned from the direction adjacent to the cable tower to the direction away from the cable tower according to the cable number sequence.
The method (1) consumes a lot of time and cost due to the fact that the strength of the wet joint concrete needs to be waited section by section to reach the design strength; the method (2) is easy to cause the cracking of the bridge deck and the wet joint on the front end steel beam section, and in order to avoid the cracking, the stay cable needs to be subjected to 'firstly super-tensioning and then return and release', but the construction cost needs to be increased.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a rapid circulating construction method for an upper structure of a superposed beam cable-stayed bridge aiming at the defects of the prior art, so that the concrete bridge deck is prevented from generating excessive tensile stress during construction to cause early cracking, and meanwhile, the maintenance time of a full-bridge deck wet joint is shortened by optimizing the construction process of the bridge deck, thereby achieving the effect of integrally saving construction funds.
The technical scheme of the invention is as follows:
a quick circulating construction method for an upper structure of a composite beam cable-stayed bridge is characterized by comprising the following steps:
(1) and (3) mounting the cable tower area beam section: firstly, according to a conventional construction method, constructing piers and cable towers, installing steel beam segments in cable tower areas, paving bridge decks on the steel beam segments, pouring wet joints of the bridge decks, and tensioning stay cables; assembling a bridge deck crane on the outermost beam section of the cable tower area;
(2) installing cantilever beam sections: utilizing a bridge deck crane to lift a first steel beam section of a main beam cantilever, and welding or bolting the first steel beam section with a beam section where the bridge deck crane is located; installing a bridge deck on a first beam section of the cantilever during welding or bolting; after the steel beam sections are installed, stay cables are installed and tensioned for the first time, and then a bridge deck crane moves forwards to the first steel beam section of the installed cantilever;
(3) according to the method in the step (2), sequentially completing the installation of 3 cantilever steel beam sections, the installation of a bridge deck and the first tensioning of the stay cable;
(4) and (3) one-time pouring wet joint construction: moving the bridge deck crane to the steel beam section at the foremost end of the cantilever, pouring the wet joints of the bridge deck on the rest 3 cantilever beam sections at one time, and waiting for the strength of the wet joint concrete to reach the design strength value;
(5) and (3) performing secondary tensioning on the stay cable in a reverse order: after the wet joint concrete reaches the design strength, performing secondary tensioning on the stay cables of the 3 beam sections with the poured wet joints in a reversed sequence from the direction far away from the cable tower to the direction close to the cable tower;
(6) according to the method from the step (3) to the step (5), completing the installation of 3 cantilever steel beam sections, the installation of a bridge deck on the beam sections, the pouring of wet joints and the tensioning of stay cables; and circulating the process until the cantilever beam section is completely installed.
Compared with the prior art, the invention has the following advantages:
1. the traditional construction method generally adopts a construction mode of simultaneously hoisting a steel beam and a bridge deck slab, so that the requirement on the hoisting capacity of a bridge deck crane is high, and different procedures are mutually interfered; the invention utilizes the girder welding (bolting) period to carry out the deck slab paving operation, reduces the requirements on the bridge deck crane, can reduce the interference phenomenon caused by the parallel operation of different procedures and is beneficial to improving the construction progress;
2. according to the method, the wet joints on the three beam sections are poured at one time and are allowed to be strong, and compared with the existing method for pouring the wet joints section by section and allowing the wet joints to be strong independently, the method saves two thirds of time and greatly improves the construction efficiency;
3. after the pouring of the wet joints of the three beam sections is finished, the bridge deck crane is positioned on the steel beam section at the foremost end of the cantilever, the wet joints on the beam sections are not poured at first, and the steel beams and the concrete bridge deck plate work independently, so that the risk of cracking of the bridge deck plate on the beam sections in the working process of the bridge deck crane can be avoided;
4. the stay cables of the three beam sections are controllably tensioned from the direction far away from the cable tower to the direction near the cable tower in a reverse order, so that the risk of cracking of a bridge deck and a wet joint caused by tensioning in the cable number order in the traditional construction mode can be avoided.
Drawings
FIG. 1 is a construction flow chart of the present invention.
Detailed Description
As shown in fig. 1, the specific construction method of the present invention is as follows:
(1) and (3) mounting the cable tower area beam section: firstly, constructing a pier and a cable tower according to a conventional construction method, installing a steel beam segment in a cable tower area, paving a bridge deck on the steel beam segment, pouring a wet joint of the bridge deck, and tensioning a stay cable; assembling a bridge deck crane on the outermost beam section of the cable tower area;
(2) installing cantilever beam sections: hoisting a first steel beam segment of the main beam cantilever by using a bridge deck crane, and welding or bolting the first steel beam segment with a beam segment where the bridge deck crane is located; installing a bridge deck on the first beam section of the cantilever during welding or bolting; after the beam sections are installed, installing a stay cable and performing first tensioning, and then moving a bridge deck crane forwards to the first beam section of the cantilever after installation;
(3) according to the installation method of the first beam section of the cantilever, continuously hoisting and installing 3 cantilever beam sections, namely, sequentially completing the installation of the second beam section, the third beam section and the fourth beam section of the cantilever, the installation of a bridge deck on each beam section and the first tensioning of a stay cable;
(4) and (3) continuous pouring construction of wet joints: the bridge deck crane moves to a beam section at the foremost end of the cantilever, namely a fourth beam section, pouring wet joints of the bridge deck on the rest 3 cantilever beam sections, namely the first beam section, the second beam section and the third beam section of the cantilever is completed at one time, and then waiting for the strength of the wet joint concrete to be improved to a design value;
(5) and (3) performing secondary tensioning on the stay cable in a reverse order: after the wet joint concrete reaches the design strength, performing secondary tensioning on the stay cables of the 3 beam sections with the poured wet joints in a reverse sequence from the direction far away from the cable tower to the direction close to the cable tower, namely sequentially performing secondary tensioning on the stay cables of the third beam section, the second beam section and the first beam section of the cantilever, wherein the secondary tensioning is controlled tensioning; at the moment, a wet joint on the foremost beam section of the cantilever, namely the fourth beam section, is not poured, and the steel beam is independent from the concrete bridge deck;
(6) according to the installation method of the cantilever beam section, continuously completing the installation of 3 cantilever beam sections, the installation of a bridge deck on the beam section, the pouring of a wet joint and the tensioning of a stay cable; and circulating the process until the cantilever beam section is completely installed.
Above-mentioned in-process, when carrying out the wet joint continuous casting of 3 roof beam sections at every turn, the bridge floor crane is located cantilever foremost on the roof beam section, and the wet joint of this roof beam section is not poured, can avoid bridge floor crane hoist and mount during operation, and this roof beam section leads to decking and wet joint to ftracture because of the atress.
In addition, in the traditional construction mode, the bridge deck is prefabricated and hoisted simultaneously with the steel beam slab beam in the same period, the maintenance time of the bridge deck is short, and the bridge deck is also one of the reasons for the cracking phenomenon after the bridge deck is installed. In order to reduce the cracking risk of the bridge deck in the adverse stress state at the later stage, the invention adopts a prefabrication method of prefabricating in advance and storing in sufficient time for the concrete bridge deck, thereby ensuring that the bridge deck has enough maintenance time and achieving the best stress performance.
Claims (1)
1. A quick circulating construction method for an upper structure of a composite beam cable-stayed bridge is characterized by comprising the following steps:
(1) and (3) mounting the cable tower area beam section: firstly, according to a conventional construction method, constructing piers and cable towers, installing steel beam segments in cable tower areas, paving bridge decks on the steel beam segments, pouring wet joints of the bridge decks, and tensioning stay cables; assembling a bridge deck crane on the outermost beam section of the cable tower area;
(2) installing cantilever beam sections: utilizing a bridge deck crane to lift a first steel beam section of a main beam cantilever, and welding or bolting the first steel beam section with a beam section where the bridge deck crane is located; installing a bridge deck on a first beam section of the cantilever during welding or bolting; after the steel beam sections are installed, stay cables are installed and tensioned for the first time, and then a bridge deck crane moves forwards to the first steel beam section of the installed cantilever;
(3) according to the method in the step (2), sequentially completing the installation of 3 cantilever steel beam sections, the installation of a bridge deck and the first tensioning of the stay cable;
(4) and (3) one-time pouring wet joint construction: moving the bridge deck crane to the steel beam section at the foremost end of the cantilever, pouring the wet joints of the bridge deck on the rest 3 cantilever beam sections at one time, and waiting for the strength of the wet joint concrete to reach the design strength value;
(5) and (3) performing secondary tensioning on the stay cable in a reverse order: after the wet joint concrete reaches the design strength, performing secondary tensioning on the stay cables of the 3 beam sections with the poured wet joints in a reversed sequence from the direction far away from the cable tower to the direction close to the cable tower;
(6) according to the method from the step (3) to the step (5), completing the installation of 3 cantilever steel beam sections, the installation of a bridge deck on the beam sections, the pouring of wet joints and the tensioning of stay cables; and circulating the process until the cantilever beam section is completely installed.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112482238A (en) * | 2020-12-16 | 2021-03-12 | 重庆城建控股(集团)有限责任公司 | Bridge deck wet joint construction method |
| CN113403945B (en) * | 2020-12-29 | 2022-07-12 | 长沙理工大学 | Construction method of steel-concrete composite beam cable-stayed bridge |
| CN112609598B (en) * | 2021-01-12 | 2022-05-31 | 中交二公局第一工程有限公司 | Rapid circulating construction method for upper structure of composite beam cable-stayed bridge |
| CN113774811A (en) * | 2021-10-28 | 2021-12-10 | 江西省长大桥隧研究设计院有限公司 | Method for building upper structure of composite beam cable-stayed bridge |
| CN115652812B (en) * | 2022-12-27 | 2023-05-16 | 湖南省交通规划勘察设计院有限公司 | Asynchronous construction method of PK section composite beam cable-stayed bridge |
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