Reverse towing device capable of reducing longitudinal deformation of soil when box culvert is jacked in

Abstract

The invention relates to a reverse towing device capable of reducing longitudinal deformation of soil when a box culvert is jacked in. The reverse towing device comprises a towing plate, a storage component inside a towing sleeve, an anchoring component outside the towing sleeve and an anti-drag pulley. The towing plate is of thin-plate coiled materials and pulled out from the front end of the box culvert when the box culvert is jacked in to separate the box culvert and soil layers. The storage component inside the towing sleeve is arranged in the box culvert and used for accommodating the towing plate and synchronously releasing the same when the box culvert is further jacked in. The anchoring component outside the towing sleeve is arranged in a box culvert starting well and used for fixing the outer end of the towing plate. By the anti-drag pulley which is arranged at the front end of a box body, sliding friction is replaced by rolling friction, thus the towing plate is low in frictional resistance when pulled out of the front end and is protected from damage caused by large local pressure of a bezel. Compared with the prior art, the reverse towing device is mainly applied to the top of the box culvert to be a substitute for a pipe curtain method and thixotropic mud, and is used for separating the soil and the box culvert so as to control disturbance to the soil and to avoid deformation of strata above the box culvert.

Description

technical field [0001] The invention belongs to the technical field of building tunnel engineering construction, and in particular relates to an anti-drag device for reducing the longitudinal deformation of soil during box culvert jacking. Background technique [0002] The box culvert jacking method is a non-excavation construction method in which the box culvert pipe joints are poured on site, and the pipe joints are pushed through the soil layer to the designated position with the help of the thrust of the jack. Due to its high section utilization rate, it does not affect the upper part. Traffic and other characteristics, widely used in engineering examples of crossing tunnels with large cross-sections in short and medium distances. Since the 21st century, the development of pipe screen method and thixotropic mud technology has further expanded the application range of box culvert method and enhanced its ability to control ground deformation. [0003] However, the constru...

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Problems solved by technology

[0003] However, the construction of the pipe curtain method is cumbersome, requires high construction accuracy, and the deformation of the ground is not easy to control, and the increase in time and economic costs cannot be ignored

Although the existing thixotropic mud technology is effective in lubricating and reducing drag between the box culvert and the soil, the disturbance caused by the jacking construction of many pipe jacking groups, especially the late consolidation in the soft soil stratum Subsidence has not yet been well resolved

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