Work carts and face work methods

The work cart with slidable head guards and two-point support structure effectively addresses the issue of protecting workers from falling objects and collapse by securely adhering to tunnel face irregularities, enhancing safety during tunnel operations.

JP7768640B2Active Publication Date: 2025-11-12TAISEI CORP
View PDF 4 Cites 0 Cited by

Patent Information

Application Number
JP2022119665
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-07-27
Publication Date
2025-11-12
Estimated Expiration
2042-07-27

AI Technical Summary

Technical Problem

Existing tunnel face work vehicles and methods fail to adequately protect workers from falling objects and collapse due to uneven tunnel surfaces, particularly when performing operations like drilling and loading explosives, as they do not effectively adapt to the surface irregularities.

Method used

A work cart equipped with a mancage boom and a falling object protection material comprising slidable shaft-shaped head guards, including an outer and inner tube with biasing means, that securely fit to the tunnel face, forming a two-point support structure to prevent gaps and stabilize the protection material.

Benefits of technology

The solution provides high safety against face collapse by ensuring the falling object protection material securely adheres to the tunnel face, minimizing damage and injury risks during operations like drilling and loading explosives.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007768640000001
    Figure 0007768640000001
  • Figure 0007768640000002
    Figure 0007768640000002
  • Figure 0007768640000003
    Figure 0007768640000003
Patent Text Reader

Abstract

To provide a work cart and a face working method with high work safety against collapse of a face when a worker riding on the work cart performs work on the face.SOLUTION: A work cart 100 working on a tunnel face K has a movable cart 10, a man cage boom 15 rotatably mounted on the cart 10, and a man cage 20 mounted on the man cage boom 15. A falling object protection member 60 is provided above the man cage 20. The falling object protection member 60 is formed by a plurality of shaft-shaped head guards 50 installed side by side, and a component 40 of the head guard 50 is slidable.SELECTED DRAWING: Figure 1
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Enclosure device for tunnel wall surface construction and temporary enclosure method for construction site of tunnel wall surface

    JP2018104942A

  • Guide steel support and steel support erecting method

    JP2021175859A

  • Worker protection equipment for tunnel construction

    JP3235327U

  • Machines for positioning roof supports in a tunnel

    US4260297A