Double-power multifunction drilling rig for secant piles
Engineering Service
Double-Head Multipurpose Drilling Secant Pile Construction
双动力多功能钻机咬合桩施工
Secant pile construction using double-head multipurpose drilling, coordinated operation of casing and drilling tools, guide-wall positioning and controlled pile overlap for retaining and groundwater cut-off structures in sand, cobbles and rock.
采用双动力多功能钻进、护筒与钻具协同作业、导墙定位及可控桩间咬合，在砂层、卵石层及岩层中进行基坑围护与止水咬合桩施工。
Supplied by Wenzhou Kingjiu Foundation Engineering Co., Ltd.
Overview
Service overview
The method uses a double-head multipurpose drilling rig, high-torque separated rotary heads, steel casing, specialized casing shoes and drilling tools, together with a guide-wall system.
The casing and internal drilling tool can be operated in a coordinated manner to form cased bores with controlled position and verticality.
Primary and secondary piles are constructed in sequence to create an overlapping pile wall. The method can serve both retaining and groundwater cut-off functions, and is suited to sites where sand, cobbles, rock or variable strata make conventional secant-pile drilling difficult.
该工法由双动力多功能钻机、大扭矩分离式动力头、钢护筒、专用管靴和钻具，并配合导墙系统组成。
护筒与内部钻具可协同作业，在套管支护条件下形成位置和垂直度可控的桩孔。
通过先施工一期桩、再施工二期桩并形成规定咬合量，构成连续桩墙，可同时承担挡土和止水功能。该工法适合砂层、卵石层、岩层或复杂互层中常规咬合桩成孔受限的项目。
Scope
Service scope
Key components that may be provided for relevant engineering scenarios.
- Guide-wall positioning and cased drilling support accurate pile location and verticality
- Controlled overlap can combine earth-retaining and groundwater cut-off functions
- Double-head operation supports drilling through cobbles and selected rock formations
- Casing support reduces collapse and soil loss in unstable layers
- Suitable for medium- and smaller-diameter secant piles requiring efficient repeated construction
- Can be integrated with excavation monitoring and staged support installation
- 导墙定位和套管钻进有利于控制桩位及垂直度
- 可控咬合可兼顾挡土与止水功能
- 双动力作业有利于穿越卵石及部分岩层
- 护筒支护可降低不稳定地层塌孔和土体流失风险
- 适合中小直径咬合桩的连续高效施工
- 可与基坑监测及分层开挖支撑体系协同实施
Scenarios
Applicable project scenarios
Typical project conditions where this offering may be relevant.
- Deep excavation retaining walls and basement perimeter structures
- Underground stations, urban underground space and adjacent-building protection works
- Flood-control, drainage, canal and water-related cut-off structures
- Sand, gravel, cobble and rock-bearing ground requiring cased secant piles
- Urban sites with limited working space
- Projects with strict deformation or groundwater-control requirements
- 深基坑围护及地下室周边结构
- 地下车站、城市地下空间及邻近建筑保护工程
- 防洪排涝、渠道及涉水工程止水结构
- 砂层、砾石、卵石和岩层中的全套管咬合桩
- 作业空间受限的城市项目
- 对变形或地下水控制要求较高的工程
Offering Details
Technical Details & Applications
Construction Control
- Confirm wall alignment, pile diameter, centre spacing, design overlap, reinforcement arrangement and cut-off requirements.
- Construct and survey the guide wall before piling; verify rig position and verticality for each pile.
- Define primary and secondary pile sequence, concrete strength window and cutting conditions for secondary piles.
- Select casing shoes and drilling tools according to sand, cobbles, rock and buried obstructions.
- Monitor verticality, casing penetration, spoil, groundwater response and pile position throughout construction.
- Verify joint continuity, overlap quality, concrete integrity and water-tightness through approved inspection methods.
Representative Projects
- Fuding Urban Nanwan Flood-Control and Drainage Project — Contract C1
Kingjiu participated in the associated excavation-support and secant-pile works. The project is located in a coastal transition zone with deep cobble deposits, creating demanding conditions for bore formation and groundwater cut-off construction.
The original solution involving bored piles and a high-pressure jet-grouting cut-off curtain was changed to a double-head full-casing secant-pile method. Continuous casing support and double-head drilling were used to improve bore stability and construct an overlapping pile wall providing both retaining and groundwater cut-off functions.
- Longyuan Park and Underground Space Development Project
Kingjiu participated in foundation and retaining works associated with the underground development. The project is located in the old urban area of Longquan and includes two basement levels. Existing residential buildings are located close to the excavation, with one Grade-D structurally unsafe building approximately 6 m from the site boundary. Ground conditions include deep cobble layers together with strongly and moderately weathered rock.
A combined solution of double-head full-casing secant piles and large-diameter DTH hammer drilling was adopted. The secant-pile system provided excavation support and groundwater control, while DTH hammer drilling was used to address difficult cobble and rock formations.
- Kinmen Water-Supply Source Protection — Nan'gao Main Canal Replacement Project
Kingjiu participated in associated foundation works for the project. Complex geological conditions and hard rock created demanding requirements for secant-pile drilling and groundwater-control structures.
Double-head full-casing secant piles were adopted, combining casing support with double-head drilling to address difficult ground and rock conditions in the construction of retaining and cut-off structures.
技术说明与应用案例
施工控制要点
- 施工前确认围护轴线、桩径、桩心距、设计咬合量、配筋及止水要求。
- 成桩前完成导墙施工与测量复核，并逐桩校验设备位置和垂直度。
- 明确一期桩、二期桩施工顺序，以及二期切削时一期桩混凝土强度窗口。
- 根据砂层、卵石、岩层和地下障碍物选用管靴及钻具。
- 全过程监测垂直度、护筒贯入、出土、地下水响应及桩位。
- 按批准的检测方法核查接缝连续性、咬合质量、桩身完整性和止水效果。
代表性工程应用
- 福鼎市城区南湾防洪排涝工程C1标段
京久基础参与该项目相关基坑支护及咬合桩施工。项目位于山海交接区域，场地存在深厚卵石层，对围护结构成孔和止水施工提出较高要求。
针对复杂卵石地层，项目将原钻孔灌注桩结合高压旋喷止水帷幕的方案调整为双动力全套管咬合桩施工，通过套管支护和双动力钻进提高复杂地层中的成孔适应性，并形成兼具围护和止水功能的连续咬合桩墙。
- 龙渊公园及地下空间开发项目
京久基础参与该项目地下空间基坑相关基础与围护施工。项目位于龙泉老城区，设置两层地下室，场地两侧邻近既有民房，用地红线距离一处D级危房约6 m；同时存在深厚卵石层、强风化岩和中风化岩等复杂地层。
施工采用双动力全套管咬合桩与大直径潜孔锤组合工艺，利用全套管咬合桩进行基坑围护及止水，并结合潜孔锤处理卵石及岩层成孔问题，以适应邻近建筑环境和复杂地层条件下的施工要求。
- 金门供水水源保障南高干渠供水替代工程
京久基础参与该项目相关基础工程施工。项目所在地层条件复杂并存在坚硬岩层，对咬合桩成孔能力及围护止水施工提出较高要求。
项目采用双动力全套管咬合桩工艺，通过钢护筒支护与双动力钻进应对复杂地层及硬岩条件，为涉水工程围护和止水结构施工提供技术支撑。
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