Tunnel Excavation Device Posture Changing Mechanism
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Solution Overview
Problem
Conventional tunnel excavation devices face difficulties in disposing supporting members correctly on curved excavation passages, as the radial extension and contraction mechanism is inadequate for aligning the supporting members with the center axis of the excavation passage when the curvature is small.
Innovation Solution
A tunnel excavation device equipped with a posture changing device that adjusts the angle between the ring portion and the cutter head's rotation axis, allowing the supporting members to be suitably positioned on curved tunnel walls by changing the yaw angle and position of the turning ring, enabling proper alignment and installation of shoring members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the support portion extends and contracts radially with respect to the ring portion while the center of the ring portion is disposed on the rotation axis of the cutter head, then the supporting member can be disposed at a predetermined position, but it becomes difficult to dispose the supporting member at the correct position on curved excavation passages with small curvature radius
Solution Approach 1:
The invention makes the ring portion dynamically adjustable by introducing a posture changing device that can change the angle between the center axis of the ring portion and the rotation axis of the cutter head. This allows the erector device to adapt its orientation dynamically according to the curvature of the excavation passage, enabling proper disposal of supporting members on both straight and curved passages.
Solution Approach 2:
The invention changes the angular parameter of the ring portion's orientation by allowing the posture changing device to adjust the angle between the center axis of the ring portion and the rotation axis of the cutter head. This parameter change enables the system to accommodate different curvature conditions of the excavation passage.
2Stability of the object's composition
If the center of the ring portion is disposed on the rotation axis of the cutter head, then the erector device can support the cutter head effectively, but the supporting member cannot be aligned with the center axis line of the excavation passage in curved tunnels
Solution Approach 1:
The ring portion is designed to be dynamically repositionable relative to the cutter head support structure. The posture changing device enables the ring portion to change its angular position, allowing the supporting member to be precisely aligned with the center axis line of the excavation passage while maintaining the stability of the erector device's support function.
Solution Approach 2:
The invention introduces an angular dimension adjustment capability by allowing the ring portion to change its orientation angle relative to the cutter head rotation axis. This additional degree of freedom enables precise alignment of the supporting member with the excavation passage center axis in curved tunnels without compromising the erector device's structural stability.
Data Source
AI summary
A tunnel excavation device includes a first body portion and an erector device. The first body portion includes a cutter head and a support portion rotatably supporting the cutter head. The erector device is configured to transport a supporting member toward an excavated wall surface. The erector device is provided on the support portion. The erector device includes a ring portion holding the supporting member, and a posture changing device configured to change an angle formed by a center axis of the ring portion and a rotation axis of the cutter head in a plan view.