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Existing-railway-crossing large-tonnage continuous-beam single-point-pushing rail-passing construction method

A technology with existing railways and construction methods, applied to bridges, bridge construction, erection/assembly of bridges, etc., can solve problems such as weak geology at the construction site, large push-up reaction force of bridge piers, and narrow construction site, and achieve simple stress conditions , The construction method is safe and the effect of saving equipment

Inactive Publication Date: 2017-09-08
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
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Problems solved by technology

[0005] The object of the present invention is to provide a construction method for single-point push-through of large-tonnage continuous girders across existing railways, which can overcome the weak geology of the construction site, the narrow construction site, the influence of existing railways, the heavy weight of box girders, and the difficulty of piers. The problem of excessive thrust and reaction force

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  • Existing-railway-crossing large-tonnage continuous-beam single-point-pushing rail-passing construction method

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Embodiment Construction

[0033] The following describes the implementation in detail in conjunction with the accompanying drawings.

[0034] A single-point push-through construction method of a large-tonnage continuous beam spanning an existing railway according to the present invention adopts the following steps for construction:

[0035] (1) Foundation construction of main pier 1 and temporary pier 2

[0036] For the weak substratum such as large plain fill and silty clay in the site, pile foundations are used for foundation treatment. A total of 167 temporary piers and 2 pile foundations are set up in the whole bid section, of which 155 are drilled with a diameter of 1.0m Since the pile foundation of temporary pier 2 is relatively close to the existing railway 3, in order to ensure the safety of the existing line, the pile foundation of temporary pier 2 closest to railway 3 adopts 12 Φ1.5m artificially dug piles, and the length of the pile foundation ranges from 16 to 25.2m range.

[0037] (2) Co...

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Abstract

The invention discloses a construction method for single-point pushing and crossing of a large-tonnage continuous beam spanning an existing railway, and belongs to the field of large-tonnage beam body pushing construction. The construction method disclosed by the present invention comprises the following steps: S1. Construction of main pier and temporary pier, S2. Construction of prefabricated platform of main span box girder, S3. Prefabrication of the left and right sides of the main span on the prefabricated platform of box girder, S4. Arrange slideways and lateral limit facilities on the top of the pier, S5. Set traction points, S6. Install steel guide beams at the front end of continuous box girders, S7. Set steel rear anchor reaction points at the ends of continuous box girders, S8. The steel strand with low strength and slack is connected to the traction end, S9. After the push is in place, the formal support is installed, and the falling beam is in place. The construction method of the invention is simple in force, saves equipment and turnover materials, is safe, and does not affect the operation of existing railways.

Description

technical field [0001] The invention relates to the field of large-tonnage beam body jacking construction, in particular to a single-point jacking construction method for large-tonnage continuous beams spanning existing railways. Background technique [0002] With the rapid development of my country's infrastructure, in bridge construction, the situation that the beam body spans the existing railway will become more and more common, and its practice and research will become more and more prominent. If scaffolding method is used for construction, brackets or steel piers must be installed in the center of the turnout. Since it is close to the catenary and the distance between the center of the turnout is small, setting up brackets or steel piers will inevitably require relocation of some catenary pillars, and The foundation needs to be strengthened, and the speed of passing trains must be limited at the same time, which has a great impact on the operation of existing railways,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00
CPCE01D21/00
Inventor 苏春生张庆何十美梁朋刚汤振亚
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
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