Pressure-sensing self-opening-closing post-pile grouting outlet valve and construction method of pressure-sensing self-opening-closing post-pile grouting outlet valve

The pressure-sensing self-opening and closing grout outlet valve after pile grouting achieves precise control of the grout through a pressure-sensing control unit and a drive actuator. This solves the problems of uncontrollable opening and closing and clogging in existing devices, improves construction quality and efficiency, adapts to harsh environments, and provides digital recording.

CN121828501APending Publication Date: 2026-04-10GANSU JIANTOU CONSTR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-24
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

The existing post-pile grouting device is uncontrollable in its opening and closing and is prone to clogging, resulting in grout leakage, grout overflow, and construction quality relying on manual experience, making it impossible to achieve precise control.

Method used

Design a pressure-sensitive self-opening and closing grout discharge valve for pile grouting. Through a pressure-sensing control unit and a drive actuator, the valve core is automatically controlled to open and close based on the differential pressure signal, ensuring that grout is discharged when the pressure is sufficient and closed in time. 316 stainless steel material and sealing ring are used to prevent grout backflow.

Benefits of technology

It achieves precise control of grout, prevents grout leakage and blockage, improves construction quality and efficiency, reduces material waste, reduces human error, provides digital construction records, adapts to harsh environments, and has a long service life.

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Abstract

The invention belongs to the technical field of geotechnical engineering, and relates to a post-pile grouting outlet valve capable of being automatically opened and closed through pressure induction and a construction method of the post-pile grouting outlet valve. The slurry outlet valve comprises a valve body, wherein a valve core, a reset elastic piece, a slurry outlet, a slurry inlet, a driving execution mechanism and a pressure sensing control unit are arranged in a valve cavity of the valve body. According to the core improvement, the pressure sensing control unit can collect pressure difference signals of the inner cavity and the outer cavity in real time and compare the pressure difference signals with a preset opening threshold value and a preset closing threshold value. When the pressure difference reaches an opening threshold value, the pressure sensing control unit instructs to drive the execution mechanism to be opened, the elastic reset piece and the valve element are pulled to move to open the grout outlet, and grout is evenly pressed into the soil body; and when the pressure difference reaches a closing threshold value, the control unit instructs to drive the executing mechanism to reset, and meanwhile, the elastic resetting piece resets, so that the valve element resets, and the slurry outlet is closed. The method has the advantages that the risk of manual operation errors is reduced, backward flowing of mud is eradicated, and the construction quality is controllable.
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