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钢板桩围堰施工的质量控制措施

发布时间:2016-2-29 16:52:52 浏览次数:639

1)钢板桩沿轴线倾斜度较大时,采用异形桩来纠正,异形桩一般为上宽下窄和宽度大于或小于标准宽度的板桩,异形桩可根据实际倾斜度进行焊接加工;倾斜度较小时也可以用卷扬机或葫芦和钢索将桩反向拉住再锤击。


2)钢板桩施打过程中有时遇上大的块石或其它不明障碍物,导致钢板桩打入深度不够,采用转角桩或弧形桩绕过障碍物。


3)围护拉森桩打好后,首先检查拉森桩的咬口,如发现有脱缝时在开口处补插钢板桩,以减少缝隙中漏水、漏泥现象。其次检查水平联系围檩和支撑的安装情况是否符合设计要求,待全部检查及准备工作完成之后,对堰身进行全面检查后方可进行围堰内清淤。


4)钢板桩挤进过程中受到石块等侧向挤压作用力大小不同容易发生偏斜,采取以下措施进行纠偏:在发生偏斜位置将钢板桩往上拔l.0m~2.0m,再往下锤进,如此上下往复振拔数次,可使大的块石被振碎或使其发生位移,让钢板桩的位置得到纠正,减少钢板桩的倾斜度。


5)在拆除围堰前,必须回沙及回土使围堰内相平后方可拆除围堰。


6)在基础较软处,有时发生施工当时将邻桩带入现象,采用的措施是把相邻的数根桩焊接在一起,并且在施打当桩的连接锁口上涂以黄油等润滑济减少阻力。


7)拉森桩打入底标高,入土深度必须达到拉森桩桩长2分之1倍长度以上,紧密咬口式呈长方形,弯曲的拉森桩(桩身弯曲矢度大于1‰桩长)不得使用。


1) steel sheet pile along the axis tilt angle is large, the special-shaped pile to correct, shaped pile is generally under the wide and narrow width greater than or less than the standard width of sheet pile walls, shaped pile can be according to the actual inclination for welding and processing; inclination is small can also winch or hoist and cable pile reverse pull again hammering.

2) steel plate piles in the process sometimes in big stone or other unknown obstacles, resulting in the steel sheet pile into deep enough, the use of corner pile or pile curved around obstacles.

3) retaining the Larsen pile after playing well, first check the Larsen pile of bite, such as found in the removal of the joints in the opening of the fill in steel sheet pile, in order to reduce the gap in water leakage, leakage of mud. Then check the level of contact Wai purlin and supporting the installation conforms to the design requirement, pending completion of all examination and preparation work, on the weir body of a comprehensive inspection before cofferdam dredging.

4) steel sheet pile engraving process by stones, etc. the lateral extrusion force different prone to deviation, take the following measures to rectify the deviation: in the event of a deflection position steel sheet pile to pull l.0m ~ 2.0m. Further down the hammer and so on reciprocating vibro several times, can be being broken by vibration or the displacement of a large piece of stone, make the steel plate pile position corrected, reduce steel sheet pile inclination.

5) in Cofferdam Demolition, must return to the sand and soil to cofferdam is flat after cofferdam demolition.

6) on the basis of a soft, sometimes occur construction was the adjacent piles into the phenomenon, the measures adopted are several piles adjacent welded together, and the play pile connecting lock mouth painted butter lubrication economy to reduce drag.

7) the Larsen pile into the bottom elevation, depth of penetration must reach Larsen pile length over 2 1 times the length of that closely bite mouth type rectangular, bent Larsen pile (pile bending vector is greater than one in a thousand of the pile length) shall not be used.


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