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Bridge type shield construction method for box type bridge

A construction method and technology for bridges, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve problems such as inability to meet traffic needs, and achieve the effect of reducing operation time and safety risks, good operation stability, and improving speed limit.

Active Publication Date: 2009-09-02
胡麓山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increasing speed of trains and the increasing design span of box bridges, traditional construction methods can no longer meet the traffic needs.

Method used

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  • Bridge type shield construction method for box type bridge
  • Bridge type shield construction method for box type bridge
  • Bridge type shield construction method for box type bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Lincun 2-13m Rigid Bridge Project of Guangzhou-Shenzhen Line

[0027]It is designed as a 2-hole rigid bridge with a clearance of 13.03×6m, a length of 14m, a bridge spacing of 5m, and 0.9m from the top of the rail to the top of the culvert, passing through two high-speed seamless main lines underneath. The box-shaped bridge is prefabricated in a single section and constructed by the bridge shield method. During the jacking period, the line is only simply buckled with rails, and there is no digging pile to lift the beam. During the jacking period, the train running speed is limited to 60Km / h to 80km / h. The newly erected bridge has been jacked in place, the south bridge is 6cm lower than the design elevation, and the north bridge is 4cm higher than the design elevation.

Embodiment 2

[0029] 2-8m+2-12m just erected bridge to pass through Beijing-Zhuhai Expressway

[0030] The project is located on Renmin East Road, Changsha City, with a 72° oblique intersection. The foundation is loamy soil with a bearing capacity of 160kpa and no groundwater. The bridges are all 35m long, and the box-shaped bridges are divided into three prefabricated sections. The bridge shield method and the relay method are jacking construction. During the construction period, the speed of vehicles is not limited, and the jacking quality is excellent. The original construction unit used the tube shed method to support and jack the project, the road surface was seriously damaged, and the box bridge was pulled out after the head was planted, and the bridge shield method was used to complete it.

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Abstract

The invention discloses a bridge-type shield construction method for a box-shaped bridge, which comprises the following steps: (1) excavating a foundation pit on the road section side where the box-shaped bridge needs to be built according to the design height of the box-shaped bridge; (2) ) Make slides according to the length of the bridge; (3) Prefabricate box bridges according to design requirements; (4) Make shields and install shields according to the height and width of box bridges; (5) Reinforce lines as needed (6) Carry out cyclic box bridge jacking operations in the order of sub-shield excavation, central soil excavation, axis measurement, box bridge jacking, jacking correction, and line maintenance. (7) Box bridge jacking is Restore the normal operation of the line and dismantle the shield. The invention has the advantages of improving the speed limit of the construction section, construction safety and low risk, and is used for the construction of box-type bridges under the existing railway and highway foundations.

Description

technical field [0001] The invention relates to a construction technology of a box-shaped bridge, in particular to a bridge shield construction method for a box-shaped bridge under existing railway and highway foundations. Background technique [0002] The traditional method of adding box-type bridges under existing railway lines or highways is that the railway generally adopts frame prefabrication, and the jacking method of overhead lines is used for construction. During the jacking period, the train runs at a speed of 25-45Km / h. The highway adopts the construction method of temporary access road and cast-in-place box bridge. With the increasing speed of trains and the design span of box bridges getting larger and larger, the traditional construction methods can no longer meet the needs of traffic. Contents of the invention [0003] The purpose of the present invention is to provide a bridge shield construction method for a box-shaped bridge that can improve the speed li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/04E01D21/00
Inventor 胡麓山
Owner 胡麓山
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