CN114411710A - 一种用于光伏支架的phc管桩与螺旋钢桩组合桩基础 - Google Patents
一种用于光伏支架的phc管桩与螺旋钢桩组合桩基础 Download PDFInfo
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Abstract
本发明属于土木工程技术领域,具体涉及一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,组合桩基础由底板、加劲肋、PHC管桩、PHC管桩端板、钢管桩、螺旋叶片和桩尖组成;螺旋叶片焊接在钢管桩的外表面上,PHC管桩端板焊接在钢管桩的顶端,PHC管桩焊接在PHC管桩端板上,底板焊接在PHC管桩的顶端,桩尖焊接在钢管桩的底端,加劲肋焊接在底板的底面和钢管桩的外表面上。PHC管桩抗腐蚀性强、耐久性良好,而且抗弯刚度比螺旋钢桩大,露出地面部分还能承受上部传来的水平荷载及上部弯矩;下部为螺旋钢桩,通过叶片与土体之间的机械咬合作用提升了桩—土界面的抗剪强度,并充分发挥螺旋桩在抗拔工程中有独特的优势。
Description
技术领域
本发明属于土木工程技术领域,具体涉及一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础。
背景技术
光伏支架基础多采用桩柱一体的高承台桩,共性是对承载力要求不高,场地多位于水体内或岸边,浅层为软土或淤泥,施工条件较差,尤其在严寒地区因冻土对温度极为敏感,气温变化可造成土体不同程度冻胀变形、融化下沉及冻拔位移,不仅给施工造成巨大困难,还为后期建筑工程使用带来不便和安全隐患。冻土地区光伏电站桩基础主要有两个缺点:一是直接照搬照抄其它地区的基础(如:直接用PHC管桩、螺旋钢桩等),忽视了高纬度冻土地区对基础冻胀冻拔的影响;二是现有的桩基础不能很好地解决冻土地区抗冻胀和抗冻拔的问题,不利于对光伏电站在高纬度冻土地区的推广建设和发电效率的提升。针对上述问题,一些工程师通过增加PHC管桩桩长来抵消冻拔力,这种做法不经济、桩太长也会增加施工难度;还有的使用螺旋钢桩来抵消冻拔力,但是桩体上部抗压和抗弯能力不足,影响光伏支架的稳定性。因此需要进一步优化以解决光伏支架基础的冻胀冻拔及稳定性问题。
发明内容
为了解决上述技术问题,本发明提供了一种新型用于光伏支架的PHC管桩与螺旋钢桩组合桩基础。将PHC管桩与螺旋钢桩组合,形成一种新型桩体,PHC管桩抗腐蚀性强、耐久性良好,而且抗弯刚度比螺旋钢桩大,因此上部为PHC管桩不但承受竖向压力,露出地面部分还能承受上部传来的水平荷载及上部弯矩;下部为螺旋钢桩,通过叶片与土体之间的机械咬合作用提升了桩—土界面的抗剪强度,并充分发挥螺旋桩在抗拔工程中有独特的优势,减少光伏支架基础出现冻胀破坏或不均匀沉降的可能性。
本发明采用的技术方案为:一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,所述组合桩基础由底板、加劲肋、PHC管桩、PHC管桩端板、钢管桩、螺旋叶片和桩尖组成;所述螺旋叶片焊接在钢管桩的外表面上,所述PHC管桩端板焊接在钢管桩的顶端,所述PHC管桩焊接在PHC管桩端板上,所述底板焊接在PHC管桩的顶端,所述桩尖焊接在钢管桩的底端,所述加劲肋焊接在底板的底面和钢管桩的外表面上。
进一步的,所述底板上开有圆周均布的安装孔。
进一步的,加劲肋的数量为4个,其圆周均布地排布在钢管桩的外圆周上。
进一步的,所述钢管桩的表面镀锌。
进一步的,所述螺旋叶片的表面镀锌。
进一步的,所述桩尖的表面镀锌。
进一步的,组合桩基础镀锌厚度最小应满足如下要求当壁厚大于6mm时镀锌局部厚度大于等于70µm,平均厚度大于等于85µm。
进一步的,螺旋叶片的直径为叶片水平投影直径,壁厚应由抗拔力及管桩单桩承载力特征值确定,且厚度t≥4mm。
本发明的有益效果:提供了一种新型用于光伏支架的PHC管桩与螺旋钢桩组合桩基础。将PHC管桩与螺旋钢桩组合,形成一种新型桩体,PHC管桩抗腐蚀性强、耐久性良好,而且抗弯刚度比螺旋钢桩大,因此上部为PHC管桩不但承受竖向压力,露出地面部分还能承受上部传来的水平荷载及上部弯矩;下部为螺旋钢桩,通过叶片与土体之间的机械咬合作用提升了桩—土界面的抗剪强度,并充分发挥螺旋桩在抗拔工程中有独特的优势,减少光伏支架基础出现冻胀破坏或不均匀沉降的可能性。
附图说明
图1是实施例一的结构示意图;
图2是实施例一中底板的俯视结构示意图;
图3是实施例一中加劲肋的主视结构示意图;
图4是实施例一中PHC管桩端板的俯视结构示意图;
图5是图4的左视图;
图6是实施例一中螺旋叶片的结构示意图。
具体实施方式
实施例一
参照各图,一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,所述组合桩基础由底板1、加劲肋2、PHC管桩3、PHC管桩端板4、钢管桩5、螺旋叶片6和桩尖7组成;所述螺旋叶片6焊接在钢管桩5的外表面上,所述PHC管桩端板4焊接在钢管桩5的顶端,所述PHC管桩3焊接在PHC管桩端板4上,所述底板1焊接在PHC管桩3的顶端,所述桩尖7焊接在钢管桩5的底端,所述加劲肋2焊接在底板1的底面和钢管桩5的外表面上;所述底板1上开有圆周均布的安装孔;所述加劲肋2的数量为4个,其圆周均布地排布在钢管桩5的外圆周上;所述钢管桩5、螺旋叶片6和桩尖7的表面镀锌。
PHC管桩与螺旋钢桩组合桩基础用于解决冻土地区光伏发电支架基础由于冻胀融沉破坏引起光伏板角度变化,使其系统发电效率降低,尤其是桩基础可能发生严重冻拔,造成基础上升、倾斜,甚至整体失效。主要应用于冻土地区光伏支架基础,将传统的PHC管桩与螺旋钢桩组合,形成一种新的桩型,既满足光伏设计对基础的抗压、抗剪和抗拔要求,又满足冻土地区抗冻胀、抗冻拔的要求。该基础可通过螺旋钢桩叶片与土体之间的机械咬合作用提升桩——土界面的抗拔强度。并且具有上部PHC管桩的抗腐蚀性强、耐久性良好的特点,来应对冻土地区地下水位高,由于冻融作用导致桩基础受到侵蚀的问题;上部PHC管桩刚度较大,露出地面部分能更好地承受上部结构传来的水平荷载及上部弯矩,避免光伏板和支架的变形。将PHC管桩和螺旋钢桩结合,充分利用两种桩型的优点和受力特点,解决冻土地区光伏支架桩基础的冻胀破坏的问题,普遍适用于冻土地区的光伏支架或路灯杆等小型支架类桩基础设计,为解决冻土地区基础冻胀冻拔破坏及不均匀沉降的问题提供新的桩型。
施工时,作业人员使用平板车将桩运输至桩点位两侧,保持桩尖朝向作业运动方向、且能够避开打桩机两边的轮带行走范围,以方便施工、加快作业速度。采用小型装载机带动式打桩机与桩的底板的4个螺栓孔与打桩机自带的螺杆连接,采用旋压的方式,将桩打入土层。
以上内容仅为说明本发明的技术思想,不能以此限定本发明的保护范围,凡是按照本发明专利提出的技术思想,在技术方案基础上所做的任何改动,均落入本实用发明权利要求书的保护范围之内。
Claims (6)
1.一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,其特征在于:所述组合桩基础由底板(1)、加劲肋(2)、PHC管桩(3)、PHC管桩端板(4)、钢管桩(5)、螺旋叶片(6)和桩尖(7)组成;所述螺旋叶片(6)焊接在钢管桩(5)的外表面上,所述PHC管桩端板(4)焊接在钢管桩(5)的顶端,所述PHC管桩(3)焊接在PHC管桩端板(4)上,所述底板(1)焊接在PHC管桩(3)的顶端,所述桩尖(7)焊接在钢管桩(5)的底端,所述加劲肋(2)焊接在底板(1)的底面和钢管桩(5)的外表面上。
2.根据权利要求1所述的一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,其特征在于:所述底板(1)上开有圆周均布的安装孔。
3.根据权利要求1所述的一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,其特征在于:所述加劲肋(2)的数量为4个,其圆周均布地排布在钢管桩(5)的外圆周上。
4.根据权利要求1所述的一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,其特征在于:所述钢管桩(5)的表面镀锌。
5.根据权利要求1所述的一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,其特征在于:所述螺旋叶片(6)的表面镀锌。
6.根据权利要求1所述的一种用于光伏支架的PHC管桩与螺旋钢桩组合桩基础,其特征在于:所述桩尖(7)的表面镀锌。
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