高楼山特长公路隧道主洞送风口顶隔板技术研究

Study on Top Partition Technology for Air Supply Outlet of Main Tunnel of Gaoloushan Extra-long Highway Tunnel

摘要:

特长公路隧道主洞送风口采用混凝土顶隔板会导致施工进度缓慢且通风阻力增大，针对这一弊端，提出钢波纹板代替混凝土的新型顶隔板技术。通过理论分析，从通风沿程阻力、结构力学性能等方面对新技术进行可行性分析。结果表明：采用钢波纹板作为送风道顶隔板材料时，其沿程阻力为混凝土顶隔板的60%左右；新方案下钢波纹板、锚固吊杆及堵头钢板结构的受力结果均在材料安全限值范围以内，新型结构安全稳定；新型钢波纹板顶隔板方案不仅可以满足送风口通风的基本要求，尤其结构采用装配化的施工工艺后，有效克服了传统混凝土结构不节能、不便捷的短板，并提升了施工速度，缩短了建设工期。

Abstract:

The use of concrete top partitions for the air supply outlet of the main tunnel of a super-long highway tunnel can lead to slowing the construction progress and increasing the ventilation resistance. To address this drawback, a new top partition technology using steel corrugated panels instead of concrete is proposed. Through the theoretical analysis, the feasibility analysis is conducted on the new technology from the aspects of ventilation resistance along the line, structural mechanical performance etc. The results show that when using the steel corrugated plates as the top partition material of the air supply duct, its resistance along the line is about 60% of that of the concrete top partition. The stress results of the steel corrugated plate, anchor suspension rod and plug steel plate structure under the new scheme are all within the material safety limit range， and the new structure is safe and stable. The new type of steel corrugated plate top partition scheme can not only meet the basic requirements of ventilation for air supply outlets， but also effectively overcome the shortcomings of not energy-saving and inconvenient after adopting the assembly construction technology， which improves the construction speed and shortens the construction period.