CN112282638B - 一种跟管钻进成孔回填灌浆施工方法 - Google Patents
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Abstract
本发明提供了一种跟管钻进成孔回填灌浆施工方法,包括以下步骤:采用跟管钻进的方式钻孔,即使钻具不断钻掘地下土体时向孔洞内插入护筒;当遇到岩石时,爆破破坏岩石后获得工艺槽,采用水泥、粗骨料、细骨料、膨润土与适量水均匀拌和制得混凝土,再将该混凝土灌注填满工艺槽内,待其凝结后形成填充体;重复步骤一至步骤二直至施工结束。采用本发明的技术方案,通过采用跟管钻进的方式,及时对钻取的孔段进行支护,爆破岩石的方法提高了施工效率,填筑混凝土中掺入膨润土,减少了对孔壁的冲刷,并能防止地下水渗透,避免出现塌孔、掉块等问题,使施工进展顺利。
Description
技术领域
本发明属于建筑工程技术领域,尤其涉及一种跟管钻进成孔回填灌浆施工方法。
背景技术
钻孔是建筑工程中常见的施工方式,当地面地质条件较差,即地下土体处于松散破碎地层,如砂层、卵砾石地层、破碎带、块石回填地层等,在钻具钻进过程中又遭遇坚硬的岩石时,对钻孔施工过程影响很大,在松散破碎地层钻孔常出现孔壁不稳定,极易坍塌掉块等问题,而遭遇坚硬的岩石又会影响施工进度,影响成孔效率,现有技术中,对于硬岩层,含漂石、滚石的卵砾石地层钻进采用钢绳冲击钻进,利用钻头的冲击挤密和孔内填加粘土的办法,可有效护壁,保证孔壁的稳定,但孔内遇水、地层孔隙比较大时,孔壁不易稳定,钢绳冲击纯钻进时间仅占总工作时间的0.27%~0.4%,钻进效率低,钢绳冲击钻进只能钻进直孔;随着科学技术的进步,针对上述二种钻进方法存在的缺欠,采用潜孔锤同心跟管钻进,这种方法是通过套管保护孔壁,护壁效果好,但钻进时外管回转,回转扭矩较大,故需要配备较大扭矩、较大功率的回转钻机,钻机重量大,受交通条件的限制,一些施工区难以进入,受钻机扭矩和钻具强度限制,钻进的深度一般较浅,对于深孔的钻进无法施工,因此目前这些钻孔方法不能完全满足松散破碎地层的钻进,而该类不稳定地层在水井施工、边坡锚固、地质勘察、地震勘察的工程施工中工作量又很大,急待改进和创新。
发明内容
为解决上述技术问题,本发明提供了一种跟管钻进成孔回填灌浆施工方法。
本发明通过以下技术方案得以实现。
本发明提供一种跟管钻进成孔回填灌浆施工方法,包括以下步骤:
步骤一:采用跟管钻进的方式钻孔,即分多次使钻具钻掘地下土体获得多个前置孔段,所述钻具每钻取一个前置孔段后,即将该前置孔段上方的所有前置孔段作为后置孔段并插入护筒;
步骤二:当在施工过程中遇到岩石时,取出钻具,向相应的前置孔段内放入爆破筒,爆破破坏岩石后获得工艺槽,采用水泥、粗骨料、细骨料、膨润土与适量水均匀拌和制得混凝土,再将该混凝土灌注填满工艺槽内,待其凝结后形成填充体;
步骤三:重复步骤一至步骤二,直至施工结束。
步骤一中所述钻具是型号为YG-80的风动潜孔钻机。
步骤一中所述护筒外径为114mm~140mm。
步骤一中所述前置孔段深度为2m~6m。
步骤一中所述护筒插入后置孔段的速度不小于2m/s。
步骤一中所述钻具钻掘地下土体时的转速小于200r/min。
步骤二中所述混凝土坍落度为18cm~22cm,混凝土扩散度为34cm~40cm,密度不小于2100kg/m3。
步骤二中所述水泥为强度等级不低于42.5的硅酸盐水泥,粗骨料包括最大粒径小于40mm的天然卵石或砾石,并且粗骨料中含泥量小于1.0%,泥块含量小于0.5%,细骨料包括细度模数为2.4~3.0的中细砂,控制细骨料中含泥量小于3%,粘粒含量小于1.0%。
本发明的有益效果在于:采用本发明的技术方案,通过采用跟管钻进的方式,及时对钻取的孔段进行支护,减少了对地下土体结构的扰动和破坏,当遭遇坚硬岩石时,使用爆破施工有利于提高施工效率,在进行爆破施工后及时使用混凝土进行回填加固,避免孔洞出现坍塌,罐注的混凝土中掺入膨润土,减少了混凝土中含砂量的占比,减少了对孔洞内壁的冲刷,有助于减少对地下土体的扰动,能够使混凝土材料更致密,防止地下水渗透至孔洞内,进一步有效避免出现塌孔、掉块等问题,使施工进展顺利。
附图说明
图1是本发明的工艺流程图。
具体实施方式
下面进一步描述本发明的技术方案,但要求保护的范围并不局限于所述。
如图1所示,本发明提供一种跟管钻进成孔回填灌浆施工方法,包括以下步骤:
步骤一:采用跟管钻进的方式钻孔,即分多次使钻具钻掘地下土体获得多个前置孔段,钻具每钻取一个前置孔段后,即将该前置孔段上方的所有前置孔段作为后置孔段并插入护筒;进一步地,步骤一中钻具是型号为YG-80的风动潜孔钻机。步骤一中护筒外径为114mm~140mm。步骤一中前置孔段深度为2m~6m。步骤一中护筒插入后置孔段的速度不小于2m/s。步骤一中钻具钻掘地下土体时的转速小于200r/min。采用本发明的技术方案,采用低速钻进,快速插入护筒的方法,能够及时对孔洞内壁进行防护,为施工过程赢得时间,防止孔洞内壁出现塌孔现象。
步骤二:当在施工过程中遇到岩石时,取出钻具,向相应的前置孔段内放入爆破筒,爆破破坏岩石后获得工艺槽,采用水泥、粗骨料、细骨料、膨润土与适量水均匀拌和制得混凝土,再将该混凝土灌注填满工艺槽内,待其凝结后形成填充体;另外,步骤二中混凝土坍落度为18cm~22cm,混凝土扩散度为34cm~40cm,密度不小于2100kg/m3。步骤二中水泥为强度等级不低于42.5的硅酸盐水泥,粗骨料包括最大粒径小于40mm的天然卵石或砾石,并且粗骨料中含泥量小于1.0%,泥块含量小于0.5%,细骨料包括细度模数为2.4~3.0的中细砂,控制细骨料中含泥量小于3%,粘粒含量小于1.0%。
步骤三:重复步骤一至步骤二,直至施工结束。
采用本发明的技术方案,通过采用跟管钻进的方式,及时对钻取的孔段进行支护,减少了对地下土体结构的扰动和破坏,当遭遇坚硬岩石时,使用爆破施工有利于提高施工效率,在进行爆破施工后及时使用混凝土进行回填加固,避免孔洞出现坍塌,罐注的混凝土中掺入膨润土,减少了混凝土中含砂量的占比,减少了对孔洞内壁的冲刷,有助于减少对地下土体的扰动,能够使混凝土材料更致密,防止地下水渗透至孔洞内,进一步有效避免出现塌孔、掉块等问题,使施工进展顺利。
Claims (3)
1.一种跟管钻进成孔回填灌浆施工方法,其特征在于:包括以下步骤:
步骤一:采用跟管钻进的方式钻孔,即分多次使钻具钻掘地下土体获得多个前置孔段,所述钻具每钻取一个前置孔段后,即将该前置孔段上方的所有前置孔段作为后置孔段并插入护筒;
步骤二:当在施工过程中遇到岩石时,取出钻具,向相应的前置孔段内放入爆破筒,爆破破坏岩石后获得工艺槽,采用水泥、粗骨料、细骨料、膨润土与适量水均匀拌和制得混凝土,再将该混凝土灌注填满工艺槽内,待其凝结后形成填充体;
步骤三:重复步骤一至步骤二,直至施工结束;
步骤一中所述钻具是型号为YG-80的风动潜孔钻机,步骤一中所述护筒插入后置孔段的速度不小于2m/s,步骤一中所述钻具钻掘地下土体时的转速小于200r/min,步骤二中所述混凝土坍落度为18cm~22cm,混凝土扩散度为34cm~40cm,密度不小于2100kg/m3,步骤二中所述水泥为强度等级不低于42.5的硅酸盐水泥,粗骨料包括最大粒径小于40mm的天然卵石或砾石,并且粗骨料中含泥量小于1.0%,泥块含量小于0.5%,细骨料包括细度模数为2.4~3.0的中细砂,控制细骨料中含泥量小于3%,粘粒含量小于1.0%。
2.如权利要求1所述的一种跟管钻进成孔回填灌浆施工方法,其特征在于:步骤一中所述护筒外径为114mm~140mm。
3.如权利要求1所述的一种跟管钻进成孔回填灌浆施工方法,其特征在于:步骤一中所述前置孔段深度为2m~6m。
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