风机基础施工
一、基础类型 | Foundation Types
二、基础施工 | Foundation Construction
三、基础质量 | Foundation Quality
Octagonal Spread Footing — Anchor Cage and Concrete Pour
Fan, we're about to pour the foundation for Turbine T-12. This is an octagonal spread footing — 22 meters across, 3.5 meters deep at the center. What's the concrete volume?
范工，准备浇T-12风机基础了。这是一个八角形扩展基础——直径22米、中 心深3.5米。混凝土方量多少？
范工: Total pour volume is 620 cubic meters — that's about 810 cubic yards. We're using a 5,000 psi mix with 30% fly ash replacement. This is a mass concrete pour, so we have cooling pipes embedded in three layers to control the core temperature rise.
总方量620立方米——约810立方码。用5,000 psi配合比、30%粉煤灰替代。 这是大体积浇筑，所以埋了三层冷却管控制核心温升。
Before we pour, let me walk you through the anchor cage. The L-flange insert ring is 4.8 meters in diameter, with 160 M48 high-strength anchor bolts. The anchor cage is embedded 2.8 meters deep into the foundation.
浇筑前，我给你过一遍锚栓笼。L型法兰基础环直径4.8米，带160根M48高 强锚栓。锚栓笼埋入基础2.8米深。
Let me check the top flange levelness. (uses survey level) The flange is level within 1.5 mm across the diameter — the spec requires ≤2 mm. Good. And the anchor bolt positions?
我检查一下顶法兰水平度。（用水准仪）法兰全径水平度在1.5 mm以内—— 指标要求≤2 mm。好。锚栓位置呢？
范工: All 160 bolts checked with the template — maximum deviation is 2 mm from design. The bolt projection above the flange is 380 mm, with a tolerance of ±5 mm. We've greased the threads and covered them with protective caps.
全部160根螺栓用模板核验——最大偏差2 mm。螺栓高出法兰面380 mm，公 差±5 mm。螺纹涂了润滑脂、套了保护帽。
钢筋工长: Rebar cage is inspected and cleared. We have 85 tons of rebar in this foundation — 6 layers of bottom mat, 3 layers of top mat, and 4 layers of circumferential hoop bars around the anchor cage. Concrete cover is 75 mm.
钢筋笼检查通过。这个基础85吨钢筋——6层底网、3层面网、锚栓笼周围 4层环向箍筋。保护层75 mm。
Concrete Placement and Anchor Bolt Tensioning
Fan, the concrete pour is complete and the foundation has cured for 28 days. The cylinder breaks hit 5,800 psi — well above the 5,000 psi spec. We're ready for anchor bolt tensioning.
范工，混凝土浇筑完成、养护28天了。试块强度达到5,800 psi——远高于 5,000 psi指标。可以做锚栓张拉了。
张拉技工: I've calibrated the hydraulic tensioner this morning. The bolts are M48, Grade 10.9. Specified pre-tension is 495 kN per bolt — that's about 70% of the ultimate tensile strength. We tension in three stages: 30%, 60%, 100%.
今早校准了液压张拉器。M48螺栓、10.9级。规定预拉力每根495 kN——约 为极限抗拉强度的70%。分三级张拉：30%、60%、100%。
范工: The tensioning sequence is critical — we do a star pattern, starting from the inner ring and working outward. Never tension adjacent bolts consecutively. After all bolts are at 100%, we do a second pass to verify none have relaxed.
张拉顺序很关键——星形顺序，从内圈往外走。相邻螺栓不准连续张拉。全 部到100%后，再走第二遍验证没有松弛的。
张拉技工: First pass complete. Verified all 160 bolts at 495 kN ±3%. Second pass: 12 bolts needed a small touch-up — less than 2% relaxation, which is normal. All bolts now within spec.
第一遍完成。验证全部160根螺栓在495 kN ±3%。第二遍：12根需要微调 ——松弛不到2%，正常。全部螺栓现在在规格内。
Now the secondary grouting — fill the gap under the L-flange. Use a high-strength, non-shrink, flowable grout. The gap is 50 mm — inject from one side until it flows out the vents on the opposite side. No voids allowed.
现在做二次灌浆——填充L法兰下的空隙。用高强无收缩流动灌浆料。空隙 50 mm——从一侧注入直到对面出气孔流出。不允许有空腔。