盖板预制施工技术交底.docx

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1、施工技术交底书技术交底内容：1 .技术交底范围Sxx高速公路项目盖板涵盖板预制施工。2 .设计情况(1)盖板涵盖板预制参照设计图。(2)盖板混凝土浇筑应连续，一次成形，每片预制板总时间不宜超过2ho(3)预制盖板必须在混凝土强度达到设计强度的85%以上时才能进行脱模、移动和堆放，预制盖板堆放、吊装时应在板块端部采用两点搁置和吊装，吊点位置宜在距离端部1030cm区域内，不得将顶底面倒置，吊装时应采取措施防止预制板碰撞损坏、落梁。(4)当涵洞为斜交时，涵身中部以预制正交盖板或现浇正交盖板铺设，两端以端部预制或现浇斜交盖板铺设。(5)盖板混凝土为C35,钢筋为HRB400,净保护层为35mm。(6

2、)盖板涵盖板分别为1-2队l-4m,共有四种型号，具体见下表。盖板涵盖板一览表线别涵洞孔径填土高结构尺寸盖板数量混凝土标号右幅l-2m0.5mh2m2.36*0.99*0.25m184C352mh4m2.36*0.99*0.25m734mh6m2.36*0.99*0.35m816mh8m2.36*0.99*0.35m69l-4m0.5mh2m4.56*0.99*0.45m3152mh4m4.56*0.99*0.45m1196mh8m4.56*0.99*0.55m88左幅l-2m0.5mh2m2.36*0.99*0.25m47l-4m0.5mh2m4.56*0.99*0.45m97辅道l-2m0

3、.5mh2m2.36*0.99*0.25m99l-4m0.5mh2m4.56*0.99*0.45m147l-4m2mh52.76mm2；A=200.9673.88mm2满足条件。2.IYm涵洞盖板l-4m涵洞盖板根据填土高不同其结构尺寸分为以下2种，4.56*0.99*0.45m、4.56*0.99*0.55m,盖板重量分别为4.87t、5.96t,拟采用4个20钢筋吊环起吊：A1=9800G/*n=9800*4.87/(65*6)=122.37mm2；A2=9800G/*n=9800*5.96/(65*6)=149.76mm2；选用每个20钢筋吊环，A=314122.37mm2；A=3141

4、49.76mm2满足条件。3.钢丝绳计算(1)1-2m涵洞盖板l-2m涵洞盖板根据填土高不同其结构尺寸分为以下2种，2.36*0.99*0.25m、2.36*0.99*0.35m,盖板重量分别为1.4t、1.96t,拟采用双吊点起吊，取最重的L96t盖板进行计算，根据路桥施工计算手册第481页计算可得：当吊索与盖板水平夹角为60。时：S=19.6/(2sin60o)=11.32KN;Nl=11.32cos60o=5.66KN；当吊索与盖板水平夹角为45。时：S=L96/(2sin45o)=13.86KN；Nl=13.86cos45=9.8KN；依据建筑施工手册(12.3.1.3)P822页计算

5、钢丝绳的容许拉力(安全荷载)按下式计算：S=SbK1其中Sb=Pg查表得6X37-421.5mm(1700mpa)的破断拉力为296KN；表12-18637钢丝绳的主要数据表直径钢丝总断面积参考质量钢丝绳公称抗拉强度(N/mM)钢丝绳钢丝14001550170018502000钢丝破坏拉力总和(mm)(mm2)(kg100m)(kN)不小于8.70.427.8826.2139.043.247.351.555.711.00.543.5740.9660.967.574.080.687.113.00.662.7458.9887.897.2106.5116.0125.015.00.785.3980.5

6、7119.5132.0145.0157.5170.517.50.8111.53104.8156.0172.5189.5206.0223.019.50.9141.16132.7197.5213.5239.5261.0282.021.51.0174.27163.3243.5270.0296.0322.0348.524.01.1210.87198.2295.0326.5358.0390.0421.5考虑钢丝受力不均的钢丝绳破断拉力换算系数，按手册表12-19oa=0.82；表12-19钢丝绳破断拉力换算系数a钢丝绳结构换算系数6190.856370.826610.80Pg为钢丝绳的破断拉力总和；K-

7、钢丝绳使用时安全系数，按手册表12-20取，K=6(用于机动起重设备)；表12-20钢丝绳的安全系数K用途安全系数用途安全系数作缆风绳3.5作吊索、无弯曲时6-7用于手动起重设备4.5作捆绑吊索8SlO用于机动起重设备56用于载人的升降机14则用1根6X37-2L5mm钢芯钢丝绳的容许拉力为S=SbK=0.82l296640.5KN；选用1根长2.5m的6义37-21.5InnI钢芯钢丝绳的容许拉力S=40.5KN2m盖板最大起重荷载二19.6KN,满足安全要求。选取21.5mm钢丝绳作为2m盖板起吊吊索。(2)l-4m涵洞盖板l-4m涵洞盖板根据填土高不同其结构尺寸分为以下2种，4.56*0

8、.99*0.45m、4.56*0.99*0.55m,盖板重量分别为4.87t、5.96t,拟采用4个吊点起吊，取最重的5.96t盖板进行计算，根据路桥施工计算手册第481页计算可得：当吊索与盖板水平夹角为60。时：S=59.6/(2sin60o)=34.41KN;Nl=34.41cos60o=17.21KN;当吊索与盖板水平夹角为45。时：S=5.96/(2sin45o)=42.1KN；Nl=13.86cos45=29.77KN；依据建筑施工手册(12.3.1.3)P822页计算钢丝绳的容许拉力(安全荷载)按下式计算：S=SbK1其中Sb=Pg5查表得6X37-21.5mm(1700mpa)的

9、破断拉力为296KN；表12-18637钢丝绳的主要数据表直径钢丝总断面积参考质量钢丝绳公称抗拉强度(N/mM)钢丝绳钢丝14001550170018502000钢丝破坏拉力总和(mm)(mm2)(kg100m)(kN)不小于8.70.427.8826.2139.043.247.351.555.711.00.543.5740.9660.967.574.080.687.113.00.662.7458.9887.897.2106.5116.0125.015.00.785.3980.57119.5132.0145.0157.5170.517.50.8111.53104.8156.0172.5189.

10、5206.0223.019.50.9141.16132.7197.5213.5239.5261.0282.021.51.0174.27163.3243.5270.0296.0322.0348.524.01.1210.87198.2295.0326.5358.0390.0421.5a-考虑钢丝受力不均的钢丝绳破断拉力换算系数，按手册表12-194m盖板最大起重荷载二59.6KN,满足安全要求。选取21.5mm钢丝绳作为2m盖板起吊吊索。4 .卡环选择依据建筑施工手册(12.3.5.2)查表12-26,计算如下:Q=0.035d2(12-21)式中Q一一卡环的估算允许荷载(kN)；d环的销子直径(

11、mm),查表12-26可得d=28mm46mmo(1)每套卡环允许载荷二0.035x28x28=27.44KN2m盖板最大起重荷载二19.6KN,满足安全要求，卡环选择d=28nm;(1)每套卡环允许载荷二0.035x46x46=74.06KN4m盖板最大起重荷载二59.6KN,满足安全要求，卡环选择d=46mmo表12-26卡环主要规格尺寸(mm)起重量tABCDddiMRH11281468201440181410279236189025204822181321033442410733246530221641284562811837287233251821455643213840328036

12、25210150872361494336803825225154105038148453884422522817415604617854461105230274214207052205625211460353142462580602307060130684035524530906525878651447645395270起重量tABCDdd1MRH1351007028085701568050428295401107630090761668555459320421208232096821789560491346501308834310488192100655273715 .绳卡选择依据建筑施工手册（表12-23）,钢丝绳直径为21.5mm,则每根钢丝绳选择绳卡4个，满足施工要求。表12-23绳卡数量与钢丝绳直径关系钢丝绳直径（mm）19193232383844绳卡数量（个）3456