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一级建造师市政学习笔记(五)城镇道路基层施工

  • 2026-11-12 06:01:39
一级建造师市政学习笔记(五)城镇道路基层施工

1、基层的材料与施工质量是影响路面使用性能和使用寿命的最关键因素;

2、无机结合料稳定基层特点:结构较密实、孔隙率较小、透水性较小、水稳性较好、适宜于机械化施工、技术经济较合理;

3、石灰稳定土有良好的板体性,但其水稳性、抗冻性以及早期强度不如水泥稳定土。石灰稳定土的干缩和温缩特性十分明显。已被严格禁止用于高等级路面的基层,只能用作高等级路面的底基层;

4、水泥稳定细粒土、二灰稳定土也只能用作高级路面的底基层;

5、水泥稳定粒料、二灰稳定粒料可用于高等级路面的基层和底基层;

6、水泥稳定土类材料自搅拌至摊铺碾压成型,不应超过3h,运输中应采取防止水分蒸发和防扬尘措施;车辆运输一定记得覆盖。

7、水泥稳定土类基层宜采用12~18t压路机作初步稳定碾压,混合料初步稳定后用大于18t的压路机碾压;

8、基层每层最大压实厚度为200mm,宜不小于100mm。禁止用薄层贴补的方法进行找平;

9、水泥稳定土(粒料)在进入冬期前15~30d停止施工,二灰稳定土(粒料)在进入冬期前30~45d停止施工;

10、养护:覆盖、洒水、保湿;封闭交通,养护时间最少7d;

11、土工合成材料可分为土工织物、土工膜、土工复合材料和土工特种材料等类型。具有加筋、防护、过滤、排水、隔离等功能;

12、路堤加筋的主要目的是提升路堤的稳定性。土工格栅、土工织物、土工网等土工合成材料均可用于路堤加筋,其中土工格栅宜选择强度高、变形小、糙度大的产品;

13、土工合成材料其叠合长度不应小于300mm,连接时搭接宽度不得小于150mm;

14、台背加筋的目的是减少路基与构造物之间的不均匀沉降,加筋材料宜选用土工网或土工格栅。

15、用于裂缝防治的玻纤网和土工织物应分别满足抗拉强度、最大负荷延伸率、网孔尺寸、单位面积质量等技术要求。玻纤网网孔尺寸宜为其上铺筑的沥青面层材料最大粒径的0.5~1.0倍。土工织物应能耐170℃以上的高温;

16、土质边坡防护可采用拉伸网草皮、固定草种布或网格固定撒草种。岩石边坡防护可采用土工网或土工格栅。沿河路基可采用土工织物软体沉排、土工模袋等进行冲刷防护,以保证路基坚固与稳定;

17、土工合成材料铺设后无折皱、紧贴下承层,锚固段施工符合设计要求。接缝连接强度应符合要求,上、下层土工合成材料搭接缝应交替错开;

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  1. CONNECT:[ UseTime:0.000592s ] mysql:host=172.18.0.4;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000858s ]
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  6. SELECT * FROM `set` [ RunTime:0.000350s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000700s ]
  8. SELECT * FROM `article` WHERE `id` = 579350 LIMIT 1 [ RunTime:0.000374s ]
  9. UPDATE `article` SET `lasttime` = 1794487560 WHERE `id` = 579350 [ RunTime:0.001538s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000356s ]
  11. SELECT * FROM `article` WHERE `id` < 579350 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000495s ]
  12. SELECT * FROM `article` WHERE `id` > 579350 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000480s ]
  13. SELECT * FROM `article` WHERE `id` < 579350 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000791s ]
  14. SELECT * FROM `article` WHERE `id` < 579350 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000859s ]
  15. SELECT * FROM `article` WHERE `id` < 579350 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000577s ]
0.091481s