A hollow anchor bolt connection device

By designing a hollow anchor bolt connection device, and utilizing the combination structure of the fixing sleeve and the connecting component, the problem of anchor bolts being easily bent by impact in the non-explosive method was solved. This enabled the adjustable lengthening and stable fixing of the anchor bolts, ensuring the smooth progress of the inspection.

CN224282685UActive Publication Date: 2026-05-26ROAD & BRIDGE INT CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ROAD & BRIDGE INT CO LTD
Filing Date
2025-07-11
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In the underground excavation of subway stations using non-blasting methods, when the length of the reserved hollow anchor rod is 40cm, it is easily bent or broken by the boom of the breaker hammer, which makes the inspection operation inconvenient.

Method used

A hollow anchor bolt connection device is designed, including a fixing sleeve, a first anchor bolt, a second anchor bolt, and a connecting assembly. By combining connecting bolts, limiting rods, spring rods, and limiting arc blocks, the adjustable length of the anchor bolt can be achieved, ensuring that there is no collision when the reserved length is 10-15cm, and meeting the requirements for pull-out force testing.

Benefits of technology

It ensures that when the exposed length of the reserved anchor rod is 10-15cm, it is not easy to be collided. When it is extended to 25-30cm, it meets the testing requirements, prevents the anchor rod from being bent or broken, and facilitates the testing operation.

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    Figure CN224282685U_ABST
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Abstract

This utility model discloses a hollow anchor bolt connection device, belonging to the field of anchor bolt technology. It includes a fixed sleeve, a first anchor bolt, a second anchor bolt, and two sets of connecting components. The fixed sleeve has two connecting cavities and multiple through holes, with each pair of through holes communicating with a corresponding connecting cavity. The first and second anchor bolts are movably connected to the fixed sleeve. The connecting components include two connecting bolts, two movable washers, a connecting ring, two limiting rods, two limiting arc blocks, and two spring rods. Both connecting bolts are movably connected to the fixed sleeve and pass through corresponding through holes, with both bolts threaded into threaded holes. The connecting ring is fixedly located on the outer wall of the fixed sleeve. Each limiting arc block is fixedly connected to a corresponding limiting rod and is adapted to a limiting hole. This method prevents the hydraulic breaker arm from bending or breaking the pre-installed pull-out anchor bolts, facilitating inspection.
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