Deepwater silt layer geological large-span multi-line reinforcement system and jacking culvert construction method

Abstract

The invention relates to a deep water silt layer geological large-span multi-line reinforcing system and a jacking culvert construction method, and aims at providing a reinforcing system and a construction method for a high-water-level, long-jacking-stroke, large-span and high-tonnage jacking culvert to penetrate through multiple existing lines. The reinforcing system comprises a high-pressure jet grouting secant pile, a fender pile, an anti-traversing pile and a supporting pile. The jacking culvert construction method comprises the steps of starry well-point dewatering, foundation pit excavation and sliding plate fabrication, frame bridge prefabrication, line reinforcement, jacking equipment installation and process control. By adopting starry well-point dewatering, the problems of underground water burst and foundation instability during jacking are solved; since a frame bridge is integrally jacked after being prefabricated, the rigidity is high, the seismic performance is good and the influence by climate is smaller; compared with the traditional construction method, the reinforcement and the installation are convenient and easy to operate, the jacking speed is quick and the construction period is shortened; I-shaped steel, steel rails and sleepers used for engineering can be recycled; the overall economic benefits are remarkable, the practical value is greater and the application prospect is wide.

Description

technical field

[0001] The invention relates to a line reinforcement system and a jacking culvert construction method, in particular to a deep-water silt layer geological large-span multi-line reinforcement system and a jacking culvert construction method. Background technique

[0002] At present, when the existing level crossings of railways cannot meet the needs of road traffic, jacking frame bridges are generally used to change level crossings into overpasses or overpasses. In the occasions of high water level, long jacking distance, large span and high tonnage, the problems of underground water gushing and foundation instability often occur during the jacking process of jacking culverts crossing multiple existing lines, and according to construction needs, some of them need to be interrupted Passage has brought great inconvenience to railway transportation. Contents of the invention

[0003] The object of the present invention is to provide a deep-water silt layer geo...

Examples

Embodiment Construction

[0021] Such as figure 1 As shown, a deep-water silt layer geological long-span multi-line reinforcement system includes a high-pressure rotary grouting occlusal pile 1, a protective pile 2, an anti-sway pile 3, and a support pile 4. The high-pressure rotary grouting occlusal piles are arranged at the entrance and exit of the frame bridge to reinforce the slope and the bottom of the foundation pit; the top of the protective piles is provided with a reinforced concrete crown beam 5 as a hard fulcrum for reinforcing the I-beam beam on the outer side of the bridge The anti-sway pile is the front back beam when the bridge is jacked, which can effectively prevent the line from moving laterally during the jacking of the bridge; The hard fulcrum of the beam, even if a collapse occurs, the I-beam of the beam can lift the line through the action of the supporting pile longitudinal beam, which does not affect the driving safety of the line, and can effectively prevent the collapse of the...

technical field

[0001] The invention relates to a line reinforcement system and a jacking culvert construction method, in particular to a deep-water silt layer geological large-span multi-line reinforcement system and a jacking culvert construction method. Background technique

[0002] At present, when the existing level crossings of railways cannot meet the needs of road traffic, jacking frame bridges are generally used to change level crossings into overpasses or overpasses. In the occasions of high water level, long jacking distance, large span and high tonnage, the problems of underground water gushing and foundation instability often occur during the jacking process of jacking culverts crossing multiple existing lines, and according to construction needs, some of them need to be interrupted Passage has brought great inconvenience to railway transportation. Contents of the invention

[0003] The object of the present invention is to provide a deep-water silt layer geo...

Examples

Embodiment Construction

[0021] Such as figure 1 As shown, a deep-water silt layer geological long-span multi-line reinforcement system includes a high-pressure rotary grouting occlusal pile 1, a protective pile 2, an anti-sway pile 3, and a support pile 4. The high-pressure rotary grouting occlusal piles are arranged at the entrance and exit of the frame bridge to reinforce the slope and the bottom of the foundation pit; the top of the protective piles is provided with a reinforced concrete crown beam 5 as a hard fulcrum for reinforcing the I-beam beam on the outer side of the bridge The anti-sway pile is the front back beam when the bridge is jacked, which can effectively prevent the line from moving laterally during the jacking of the bridge; The hard fulcrum of the beam, even if a collapse occurs, the I-beam of the beam can lift the line through the action of the supporting pile longitudinal beam, which does not affect the driving safety of the line, and can effectively prevent the collapse of the...

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