One-way water stopping grouting device for vertical shaft duct piece

Abstract

The invention belongs to the technical field of open caisson control, in particular to a one-way water stopping grouting device for a vertical shaft duct piece. The one-way water stopping grouting device comprises a one-way grouting valve piece, the one-way grouting valve piece is fixed in an installation groove in the inner wall of the open caisson, the one-way grouting valve piece comprises a valve body, a valve cover, a valve element, a high-pressure connecting hose, a spring, a slurry outlet and a grouting opening, the valve body and the valve cover are cuboid and are located on the same central shaft, cylindrical grooves which are opposite to the opening are formed in the bottom of the valve body and the top of the valve cover along the central axis, the valve body and the groove of the valve cover define a cylindrical cavity, the valve core and the spring are arranged in the cavity, the valve core can open the slurry outlet and the grouting opening under the action of external force, after the external force disappears, the valve core cuts off the communication between the slurry outlet and the grouting opening, the grouting slurry can only be one-way injected into the wall-rear lubricant groove, the wall-rear grouting slurry cannot flow back into the open caisson, so that the wall-rear friction resistance is stable, the open caisson is controllable, the duct piece is easy to put down and is not easy to be stuck, and the device is safe and stable.

Description

technical field [0001] The invention belongs to the technical field of caisson control, and in particular relates to a one-way water-stop grouting device for shaft segments. Background technique [0002] In recent years, with the shortage of urban land resources and the upgrading of planning concepts, the field of urban underground space has developed rapidly. In urban underground space projects, the development of horizontal underground projects has been relatively mature, such as subways, tunnels, etc. Its advantages such as small footprint and high space utilization rate are gradually increasing. For this type of project, the prefabricated segment-assembled caisson method is the best method. However, the caisson structure is often unable to sink due to excessive frictional resistance behind the wall. Commonly used The method is to inject lubricant behind the wall to aid sinking, that is, set steps on the outer wall of the caisson blade foot structure to form a lubricant g...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the shortage of urban land resources and the upgrading of planning concepts, the field of urban underground space has developed rapidly. In urban underground space projects, the development of horizontal underground projects has been relatively mature, such as subways, tunnels, etc. Its advantages such as small footprint and high space utilization rate are gradually increasing. For this type of project, the prefabricated segment-assembled caisson method is the best method. However, the caisson structure is often unable to sink due to excessive frictional resistance behind the wall. Commonly used The method is to inject lubricant behind the wall to aid sinking, that is, set steps on the outer wall of the caisson blade foot structure to form a lubricant groove, and then inject lubricant slurry into the groove; when using the inner pipe method for grouting, the grouting hole passes through In the caisson well wall layout, during the process of injecting lubricant into the lubricant groove, as the lubricant liquid level continues to rise, the fluid pressure at the grouting outlet continues to increase, and the slurry is easy to flow back along the grouting hole, causing the lubricant to The loss of grout in the trench will weaken the sinking effect, and in severe cases, the soil wall will collapse, reducing construction efficiency and increasing safety hazards

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