Directly buried expansion joint with limiting structure

By designing a direct-buried expansion joint with a limiting structure, the problem of controlling the expansion and contraction distance has been solved, enabling precise control and flexible adjustment, avoiding damage and leakage to the pipeline system, and reducing construction costs.

CN224479430UActive Publication Date: 2026-07-10JIANGSU RISHENG TECH IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
JIANGSU RISHENG TECH IND CO LTD
Filing Date
2025-08-28
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing direct-buried expansion joints are inconvenient to limit the expansion and contraction distance during use, leading to problems such as excessive deformation of the corrugated pipe, excessive stress in the pipeline system, and leakage at the joints, which increases the difficulty and cost of construction.

Method used

A direct-buried expansion joint with a limiting structure was designed. Through the sliding connection between the slip ring and the fixed rod, combined with the limiting block and the connecting mechanism, precise control and flexible adjustment of the expansion tube can be achieved. Components such as springs and magnetic rods are used to facilitate disassembly and maintenance.

Benefits of technology

It enables precise control of the telescopic pipe's movement distance, preventing excessive deformation of components and exceeding pipe stress limits, simplifying construction, reducing costs, and allowing for flexible adjustment of the telescopic distance for easy disassembly and maintenance.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model belongs to the field of expansion joints, specifically relating to a direct-buried expansion joint with a limiting structure. It includes a fixed pipe, with two symmetrically distributed expansion joints slidably sleeved inside the fixed pipe. A flange is fixedly sleeved on the outer side of each expansion joint, and multiple evenly distributed mounting holes are opened inside the flange. A connecting ring is slidably sleeved on the outer side of each expansion joint. This utility model, through the design of a sliding connection between the slip ring and the fixed pipe, allows the expansion joint to slide relative to the fixed pipe, enabling expansion compensation. The limiting block restricts the movement distance of the slip ring, precisely controlling the pipeline displacement range, preventing excessive deformation and damage to its own components, excessive stress in the pipeline system, and media leakage. It also eliminates the need for additional fixed supports, simplifying construction and reducing costs. Furthermore, the position of the limiting block is adjustable, allowing for flexible adjustment of the expansion joint's movement distance.
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