銅陵路斜塔斜拉橋工程主梁鷹架靜載預壓方案.doc

1-2跨膺架靜載預壓施工方案
一、預壓目的：
在單樁靜載試驗結果的基礎上，檢測貝雷梁、橫向工字鋼、樁體、地基的整體力學性能（局部強度、整體穩定性）；檢測各受力單元的沉降變形，為預拱度的設置、膺架搭設質量控制標準提供數據；檢測分析樁體在可能的水平力作用下的變位。
二、 預壓區選擇、預壓荷載：
肋與肋之間最小距離為6.15米，通過0.25厘米連接，在砼澆筑后未形成強度前。某肋的自重傳遞至另一肋為零。選擇受力最不利的區域如下圖位置進行預壓。
預壓采用自制頂鐵，堆載方式盡可能與施工受力模式吻合，具體見圖，預壓荷載為砼自重的1.2倍。
 每米預壓荷載： （4.836+0.975/2+0.7/2）×2.6×1.2＝17.7t/m，
中橫梁處增加荷載：（5.0+6.67/2）×2.4×0.3×2.6×1.2＝13t/處
總加載量：        17.7×16.5+13×3＝331t
三、預壓監控點設置：
貝雷梁底、橫向工字鋼頂及樁頂設高程監測點，鋼管樁頂設位移觀測點，詳細位置如圖。
四、 觀測方法及數據處理：
高程采用DS3水準儀，位移采用全站儀坐標法
1-2 Cross Scaffolding Construction of static preloading scheme
First, pre-press purposes:
In the static test pile based on the results, detection Bailey beam, transverse beams, piles, foundation, mechanical performance of the (local strength, overall stability); to detect the Settlement by force unit, the pre-arch degree setting, scaffolding erection quality control standards to provide data; testing of piles in the level of force may be under the deflection.
Second, pre-press area selection, pre-press load:
Minimum distance between the rib and rib 6.15 m by 0.25 cm to connect, not after the formation of strength in the Pouring before. Weight transfer of a rib to another rib zero. Select the region by force as shown most unfavorable position preload.
Top with homemade iron preloading, loading mode as far as possible consistent with the construction of the force model, the specific figure, pre-compression load to 1.2 times the weight of concrete.
 Preloading load per meter: (4.836 +0.975 / 2 +0.7 / 2) × 2.6 × 1.2 = 17.7t / m,
Add the load in the beam: (5.0 +6.67 / 2) × 2.4 × 0.3 × 2.6 × 1.2 = 13t / Office
Total load capacity: 17.7 × 16.5 +13 × 3 = 331t
Third, pre-pressure monitoring point settings:
Bailey beam bottom, horizontal I-beam roof and the pile top elevation monitoring points established, steel pipe pile top displacement observation points set up in detail the position of Fig.
Fourth, the observation method and data processing:
DS3 Level Elevation by the displacement method using Total Station coordinates
 

前往下載