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李家冲大断面公路隧道下穿既有高压输电铁塔,施工风险极高,为此对铁塔采取了H形框架梁和塔基灌浆等加固措施,以控制4个独立塔基的不均匀沉降变形。施工中对铁塔杆件、框架连梁、塔基沉降变形、隧道围岩变形及初支结构内力等变化规律进行了全程跟踪观测。测试结果表明:采用H形框架梁加固铁塔基础技术方案,提高了塔基整体刚度,有效控制了隧道施工过程中铁塔的累计沉降与不均匀沉降,各项指标均在容许标准范围内,保证了铁塔和隧道施工安全。
The Lijiachong large-section highway tunnel underlies the existing high-voltage transmission tower and has a high risk of construction. Therefore, reinforcement measures such as H-shaped frame beam and grouting under the tower are adopted to control the uneven settlement of 4 independent tower bases. During the construction, the whole tracking observation was carried out on the variation rules of the bar members, the beams connected with the frame, the settlement of the tower foundation, the deformation of the surrounding rock of the tunnel and the internal forces of the initial branch. The test results show that using H-frame beam to reinforce the tower foundation technology improves the overall rigidity of the tower and effectively controls the cumulative settlement and uneven settlement of the tower in the course of tunnel construction. All the indexes are within the allowable standard range, ensuring Tower and tunnel construction safety.