A triangular arch reinforced rib UHPC airtight lining and rock cave gas storage structure

By using UHPC lining with triangular arch stiffening ribs and cavern gas storage structure, the problems of instability and poor air tightness of underground gas storage structures under high pressure are solved, achieving high rigidity, fatigue resistance and reliable sealing.

CN122304775APending Publication Date: 2026-06-30GUANGZHOU INST OF RAILWAY TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU INST OF RAILWAY TECH
Filing Date
2026-05-18
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing underground gas storage structures are prone to circumferential expansion, radial bulging and axial buckling instability under high-pressure circulating internal pressure. Rectangular stiffening ribs have sharp corner stress concentrations. Ordinary concrete linings have low tensile strength and poor toughness, and poor adaptability to airtight structures, leading to lining cracking and airtightness failure.

Method used

The UHPC lining body is integrally cast using ultra-high performance concrete, combined with vertical and circumferential triangular arch lining structures, with rounded corners at the top. The lining structure and the UHPC lining body are integrally cast without joints, and a flexible airtight coating or a thin metal plate airtight layer is applied.

Benefits of technology

It significantly improves the circumferential restraint and axial buckling stability of the lining, achieves long-term reliable sealing of high-pressure gas, and has the effects of high structural rigidity, fatigue resistance and durability. It is suitable for high-pressure compressed air energy storage projects such as salt caverns and hard rock chambers.

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Abstract

This invention discloses a UHPC airtight lining and cavern gas storage structure with triangular arch stiffening ribs, belonging to the technical field of underground engineering energy storage structures. The structure includes: a UHPC lining body, integrally cast using ultra-high performance concrete, having a cylindrical section and end caps connected to both ends of the cylindrical section, with air vent components at the top of the end caps; an inner lining structure, composed of several vertical triangular arch inner linings and several circumferential triangular arch inner linings, integrally set along the inner wall of the UHPC lining body, with the root of the inner lining structure seamlessly cast integrally with the UHPC lining body, and the top of the inner lining structure having a rounded corner transition structure; and an airtight layer, laid on the inner surface of the UHPC lining body between adjacent vertical and circumferential triangular arch inner linings, the airtight layer being a flexible airtight coating or a thin metal plate; achieving long-term reliable sealing of high-pressure gas, especially suitable for high-pressure compressed air energy storage projects.
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