CN107938664A - 延性抗裂劲性复合桩 - Google Patents

延性抗裂劲性复合桩 Download PDF

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CN107938664A
CN107938664A CN201711429383.4A CN201711429383A CN107938664A CN 107938664 A CN107938664 A CN 107938664A CN 201711429383 A CN201711429383 A CN 201711429383A CN 107938664 A CN107938664 A CN 107938664A
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Prior art keywords
pile
cement
soil
tissue adhesive
cracking resistance
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魏东海
沙焕焕
邓亚光
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/48Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/52Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
    • E02D5/523Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0045Composites

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Paleontology (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

本发明公开了一种延性抗裂劲性复合桩,包括外围微膨胀纤维水泥土,内芯多段预制桩,预制桩上、下两节段接头外设置起保护作用的挤扩纤维砼。本发明能有效增加劲性复合桩外围水泥土类桩韧性和抗裂性能,保护芯桩上下段接头,防止接头在地震等动荷载作用下发生脆性破坏。

Description

延性抗裂劲性复合桩
技术领域
本发明涉及一种延性抗裂劲性复合桩。
背景技术
现有的劲性复合桩的外围水泥土类桩易泌水收缩产生裂缝,影响水泥土的强度。内芯刚性桩为预制桩时常分多段,在上下段接头处为刚性连接,加上水泥土本身韧性不足,在地震等动荷载作用下接头易发生脆性破坏。需要进一步对劲性复合桩的桩身结构和材料加以改进。
发明内容
本发明的目的在于提供一种能增加劲性复合桩外围水泥土类桩韧性和抗裂性能,保护芯桩上下段接头,防止接头在地震等动荷载作用下发生脆性破坏的延性抗裂劲性复合桩。
本发明的技术解决方案是:
一种延性抗裂劲性复合桩,其特征是:包括外围微膨胀纤维水泥土,内芯多段预制桩,预制桩上、下两节段接头外设置起保护作用的挤扩纤维砼。
所述微膨胀纤维水泥土,包括水泥土,水泥土中除掺入了水泥外,还掺入了相当于水泥含量1~8%的纤维微膨胀剂;所述纤维微膨胀剂由以下质量百分比的成分组成:
聚丙烯纤维 1~5%
氧化钙 30~50%
石膏 20~40%
氧化镁 5~10%
氧化铝 10~20%
上述成分质量百分比之和为100%。
所述挤扩纤维砼,其制作方法是:外围微膨胀纤维水泥土桩施工完成后分节插入带单向活瓣桩尖的预制桩,在现场拌合混凝土或商品混凝土中加入混凝土质量0.1~5%的钢纤维形成纤维砼,每节预制桩压至略低于接头标高时,通过预制桩的空心通道将纤维砼泵送至接头部位,再提起预制桩形成空腔,活瓣桩尖打开使纤维砼充满空腔,再继续向下插入预制桩,活瓣桩尖闭合,在接头处挤扩混凝土,形成一团起保护作用的挤扩纤维砼。
本发明能有效增加劲性复合桩外围水泥土类桩韧性和抗裂性能,保护芯桩上下段接头,防止接头在地震等动荷载作用下发生脆性破坏。
附图说明
下面结合附图和实施例对本发明作进一步说明。
图1是本发明一个实施例的结构示意图。
具体实施方式
一种延性抗裂劲性复合桩,包括外围微膨胀纤维水泥土1,在土中掺入15%的普通水泥和水泥含量2%的纤维微膨胀剂搅拌,纤维微膨胀剂含1%聚丙烯纤维、45%氧化钙、35%石膏、5%氧化镁、14%氧化铝。水泥土桩施工完成后插入内芯多段预制桩2、3,预制桩桩尖为单向活瓣,在现场拌合混凝土或商品混凝土中加入混凝土质量1%的钢纤维形成纤维砼,每节预制桩压至略低于接头标高时,通过预制桩的空心通道将纤维砼泵送至接头部位,再提起预制桩形成空腔,活瓣桩尖打开使纤维砼充满空腔,再继续向下插入预制桩,活瓣桩尖闭合,在接头处挤扩混凝土,形成一团起保护作用的挤扩纤维砼4。
本发明还可以有其他合适实施例,例将上述纤维微膨胀剂各组分的质量百分比可以采用下列范围:
聚丙烯纤维 1~5%
氧化钙 30~50%
石膏 20~40%
氧化镁 5~10%
氧化铝 10~20%
上述成分质量百分比之和为100%。

Claims (3)

1.一种延性抗裂劲性复合桩,其特征是:包括外围微膨胀纤维水泥土,内芯多段预制桩,预制桩上、下两节段接头外设置起保护作用的挤扩纤维砼。
2.根据权利要求1所述的延性抗裂劲性复合桩,其特征是:所述微膨胀纤维水泥土,包括水泥土,水泥土中除掺入了水泥外,还掺入了相当于水泥含量1~8%的纤维微膨胀剂;所述纤维微膨胀剂由以下质量百分比的成分组成:
聚丙烯纤维 1~5%
氧化钙 30~50%
石膏 20~40%
氧化镁 5~10%
氧化铝 10~20%
上述成分质量百分比之和为100%。
3.根据权利要求1所述的延性抗裂劲性复合桩,其特征是:所述挤扩纤维砼,其制作方法是:外围微膨胀纤维水泥土桩施工完成后分节插入带单向活瓣桩尖的预制桩,在现场拌合混凝土或商品混凝土中加入混凝土质量0.1~5%的钢纤维形成纤维砼,每节预制桩压至低于接头标高时,通过预制桩的空心通道将纤维砼泵送至接头部位,再提起预制桩形成空腔,活瓣桩尖打开使纤维砼充满空腔,再继续向下插入预制桩,活瓣桩尖闭合,在接头处挤扩混凝土,形成一团起保护作用的挤扩纤维砼。
CN201711429383.4A 2017-12-26 2017-12-26 延性抗裂劲性复合桩 Withdrawn CN107938664A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109024562A (zh) * 2018-10-29 2018-12-18 中南大学 一种分级推进的大直径长预制管桩及其施工方法
CN112281891A (zh) * 2020-10-21 2021-01-29 华电重工股份有限公司 一种多桩型复合桩基结构、桩基础及其施工方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109024562A (zh) * 2018-10-29 2018-12-18 中南大学 一种分级推进的大直径长预制管桩及其施工方法
CN109024562B (zh) * 2018-10-29 2024-03-15 中南大学 一种分级推进的大直径长预制管桩及其施工方法
CN112281891A (zh) * 2020-10-21 2021-01-29 华电重工股份有限公司 一种多桩型复合桩基结构、桩基础及其施工方法

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Application publication date: 20180420