Large-diameter down-the-hole hammer bored pile construction
Engineering Service
Large-Diameter DTH Hammer Bored Cast-in-Place Pile Construction
大直径潜孔锤钻孔灌注桩施工
Large-diameter bored cast-in-place pile construction using down-the-hole hammer rock breaking and an integrated drilling system for thick rockfill, boulders, underground obstructions, cobble layers and hard rock.
采用潜孔锤孔底破岩与综合钻进系统，面向深厚抛填石、孤石、地下障碍物、卵砾石层及硬岩地层提供大直径钻孔灌注桩施工服务。
Supplied by Wenzhou Kingjiu Foundation Engineering Co., Ltd.
Overview
Service overview
The method integrates a high-stability multipurpose piling rig, rotary power head, DTH hammer, drill tools and high-pressure air supply. The hammer breaks rock directly at the bottom of the borehole while the drilling system removes cuttings and maintains drilling continuity.
Depending on the overburden and groundwater conditions, the method can be combined with casing, rotary drilling and slurry-supported bore formation before reinforcement cage installation and concrete placement.
It is intended for large-diameter and deep rock-socketed piles where conventional drilling may be slowed by boulders, hard rock or mixed formations. Equipment and process combinations are selected according to pile size, socket depth, rock condition, borehole stability and environmental requirements.
该工法由高稳定性多功能桩架、回转动力头、潜孔锤、钻具及高压供气系统组成。潜孔锤在孔底直接冲击破岩，钻进系统同步排出岩渣并维持连续成孔。
根据覆盖层及地下水条件，可与钢护筒、旋挖钻进和泥浆护壁等工艺组合，完成钢筋笼安装和混凝土灌注。
该工法适用于大直径、深嵌岩灌注桩，尤其适合常规钻进在孤石、硬岩或软硬互层中效率受限的项目。具体装备和工艺组合需结合桩径、嵌岩深度、岩体条件、孔壁稳定及环保要求确定。
Scope
Service scope
Key components that may be provided for relevant engineering scenarios.
- Bottom-hole impact rock breaking improves penetration in hard formations
- High-frequency, low-amplitude hammering supports stable rock fragmentation
- Air-assisted cuttings removal helps maintain bore-bottom cleanliness and drilling continuity
- Can be combined with casing, rotary drilling or slurry support across changing strata
- Reduces repeated equipment changes when penetrating overburden and rock
- Supports project-specific equipment deployment for multiple work fronts and tight programmes
- 孔底冲击破岩有利于提高硬岩地层的钻进效率
- 高频低振幅冲击可实现稳定破岩
- 供气排渣有利于保持孔底清洁和连续钻进
- 可结合钢护筒、旋挖或泥浆护壁适应地层变化
- 减少覆盖层与岩层转换过程中的反复换机换具
- 可根据工作面和工期要求进行多设备组合配置
Scenarios
Applicable project scenarios
Typical project conditions where this offering may be relevant.
- Thick rockfill, dumped stone and boulder-bearing fill
- Underground obstructions, old pile remnants and mixed fill
- Deep cobble and gravel layers, weathered rock and hard rock
- Large-diameter and deep rock-socketed piles for high-load foundations
- Nuclear power, energy and major industrial facilities
- Mountain-site and public infrastructure projects involving difficult rock excavation
- 深厚抛填石、块石回填及含孤石地层
- 地下障碍物、废旧桩残体及杂填土
- 深厚卵砾石层、风化岩及硬岩地层
- 高荷载基础所需的大直径、深嵌岩灌注桩
- 核电、能源及大型工业设施基础工程
- 涉及复杂岩层施工的山地及公共基础设施项目
Offering Details
Technical Details & Applications
Technical Principle
Large-diameter DTH hammer bored piles are a specialized pile foundation construction method developed for complex geological conditions. The method uses high-frequency impact energy from a down-the-hole (DTH) hammer to break rock and improve drilling efficiency in hard rock, cobble layers and complex fill formations.
Combined with rotary drilling equipment, slurry-supported bore formation and construction quality control procedures, the method enables stable installation of large-diameter and deep bored piles under challenging ground conditions.
This technology is particularly suitable for thick fill layers, boulders and underground obstructions, cobble and gravel formations, weathered rock and medium-hard rock conditions where conventional drilling methods may face efficiency or stability limitations.
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Technical Features
- Suitable for large-diameter pile construction under complex geological conditions;
- Improved drilling efficiency in cobble, boulder and rock formations;
- Flexible combination with rotary drilling and other construction equipment;
- Enhanced bore stability through optimized equipment configuration and construction parameters;
- Applicable to nuclear power, energy facilities, industrial buildings, public infrastructure and other demanding projects.
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Representative Projects
Zhangzhou Nuclear Power Plant Phase I (Hualong One)
Kingjiu participated in associated pile foundation construction works for this project.
The site contained more than 20 m of thick dumped-rock fill, creating significant challenges for bore stability and concrete placement control.
A combined DTH hammer and rotary drilling method was adopted. Through bentonite slurry support, optimized construction parameters and process control, Kingjiu improved bore stability and maintained reliable pile construction quality under difficult ground conditions.
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Zhejiang San'ao Nuclear Power Plant Units 1 & 2 BOP Works
Kingjiu participated in associated pile foundation construction works for this project.
Located in a coastal area, the project involved more than 40 m of deep fill layers and required rock-socketed pile construction through complex geological formations.
A combined large-diameter DTH hammer and rotary drilling method with slurry support was adopted. The DTH hammer improved rock-breaking efficiency while maintaining reliable bore formation quality for rock-socketed piles.
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Wencheng Wahaha Hongzhen Food Technology Intelligent Beverage Project
Kingjiu participated in pile foundation construction for this project.
The site contained extensive cobble layers, which affected conventional drilling efficiency. The project schedule also required efficient equipment organization and coordinated construction operations.
A double-head multipurpose DTH hammer construction method was adopted. Through optimized construction planning, increased equipment deployment and multi-working-face coordination, Kingjiu improved construction efficiency in complex cobble formations and completed the works ahead of schedule.
技术说明与应用案例
技术原理
大直径潜孔锤钻孔灌注桩是一种适用于复杂岩土条件的大直径桩基施工技术，通过潜孔锤高频冲击破碎岩土，提高硬岩、卵砾石层及复杂回填层中的成孔效率，并结合旋挖钻机、泥浆护壁及成孔质量控制技术，实现大直径、深孔条件下的稳定施工。
该工法适用于深厚回填层、孤石及地下障碍物、卵砾石层、强风化岩及中硬岩等传统钻进效率较低或成孔稳定性要求较高的工程环境。
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技术特点
- 适用于复杂地层条件下的大直径桩基施工；
- 提升卵砾石、孤石及岩层条件下的成孔效率；
- 可与旋挖钻机等设备组合形成复合施工工艺；
- 通过设备组合和施工参数优化，提高成孔稳定性；
- 适用于核电、能源、工业设施、公共建筑及基础设施工程。
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代表性工程应用
漳州核电厂一期工程（华龙一号）
京久基础参与该项目相关桩基础施工。
项目现场存在超过20 m厚深厚抛石回填层，成孔稳定性及混凝土灌注质量控制难度较高。
针对复杂回填地层，项目采用潜孔锤与旋挖钻组合施工工艺，通过膨润土泥浆护壁、施工参数优化及现场工序控制，提高孔壁稳定性，并有效控制混凝土灌注质量。
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浙江三澳核电厂1、2号机组BOP建安工程
京久基础参与该项目相关桩基础施工。
项目位于沿海区域，施工场地存在超过40 m厚回填层，需要穿越复杂地层进行嵌岩桩施工。
针对深厚回填层与岩层转换条件，项目采用大直径潜孔锤与旋挖泥浆护壁组合工艺，利用潜孔锤破岩能力提高岩层施工效率，并保障嵌岩桩成孔质量。
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文成娃哈哈宏振食品科技有限公司智能化饮料项目
京久基础参与该项目桩基础施工。
项目场地存在大量鹅卵石，传统钻进施工效率受到影响，同时项目工期要求较高，对设备组织和施工协同能力提出挑战。
项目采用双动力多功能潜孔锤施工技术，通过优化施工组织、增加设备配置和多工作面协同施工，提高复杂卵石地层中的施工效率，并提前完成施工任务。
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