Engineering Service
TRD Equal-Thickness Soil-Cement Wall and TAD Precast Assembled Diaphragm Wall
TRD等厚水泥土连续墙与TAD预制装配式地下连续墙
TRD forms an equal-thickness soil-cement wall by vertically cutting and horizontally advancing a chain-equipped cutter box while mixing grout with the in-situ ground. TAD adds prestressed tongue-and-groove precast reinforced-concrete panels to create an assembled diaphragm wall combining earth retention and groundwater cutoff.
TRD工法通过切割箱纵向切割、横向推进及原位水泥浆搅拌形成等厚水泥土连续墙；TAD工法进一步在水泥土墙内插入预应力榫卯式钢筋混凝土预制墙板，形成兼具挡土与止水功能的装配式地下连续墙。
Supplied by Zhejiang Datong Construction Technology Co., Ltd.
Overview
Service overview
The TRD (Trench Cutting Re-mixing Deep Wall) method inserts a cutter box equipped with a cutting chain and teeth to the design depth. As the cutter box advances horizontally, cement grout is injected and mixed thoroughly with the in-situ soil to form a continuous, equal-thickness soil-cement wall for deep-excavation support, groundwater cutoff, and soft-ground improvement.
The TAD method inserts prestressed tongue-and-groove reinforced-concrete precast panels into the trench-cut soil-cement wall to create a precast assembled concrete diaphragm wall. The system combines a soil-cement cutoff layer with precast structural elements for underground works requiring schedule efficiency, controlled quality, and prefabricated construction.
TRD（Trench Cutting Re-mixing Deep Wall）工法将附有切割链和刀头、达到设计深度的切割箱插入地下，在横向推进成槽的同时注入水泥浆，与原状土充分混合，形成连续、等厚的水泥土墙。该工法可用于深基坑围护、止水帷幕及软土地层改良。
TAD工法在渠式切割形成的水泥土连续墙中插入预应力榫卯（锁扣）结构钢筋混凝土预制墙板，形成预制装配式混凝土地下连续墙。该体系将水泥土止水层与预制混凝土承载构件结合，适用于对施工周期、质量控制和装配化程度要求较高的地下工程。
Scope
Service scope
Key components that may be provided for relevant engineering scenarios.
- Continuous equal-thickness TRD wall with broad ground adaptability and effective seepage control
- Continuous cutting, mixing, and wall formation for schedule-efficient construction
- Recoverable and reusable TRD steel sections supporting green and circular construction
- Tongue-and-groove or interlocking TAD precast panels for a higher degree of prefabrication
- Combined structural earth retention and soil-cement groundwater cutoff in one wall system
- Wall thickness, precast-panel thickness, and structural layout tailored to project requirements
- TRD形成连续等厚墙体，地层适应范围广，防渗性能良好
- 切割、搅拌和成墙连续进行，可缩短施工周期
- TRD型钢可回收再利用，符合绿色施工和循环利用方向
- TAD预制墙板采用榫卯或锁扣连接，提高装配化程度
- TAD将结构挡土与水泥土止水功能组合在同一墙体体系中
- 可根据工程需要配置墙厚、预制板厚度和结构布置
Scenarios
Applicable project scenarios
Typical project conditions where this offering may be relevant.
- Deep-excavation retaining systems and groundwater cutoffs
- Airports, rail-transit hubs, and major underground-space projects
- Continuous-wall construction in soft and water-bearing ground
- Projects requiring wall-thickness consistency, continuity, and seepage control
- Works combining precast concrete wall panels with earth-retaining and cutoff functions
- Projects seeking shorter schedules and reduced on-site wet work and pollution
- 深基坑围护结构与止水帷幕
- 机场、轨道交通枢纽及大型地下空间工程
- 软土及富水地层中的连续墙施工
- 对墙体等厚度、连续性和防渗性能要求较高的项目
- 需要预制装配式混凝土墙板并兼顾挡土、止水的工程
- 希望缩短工期并减少现场污染和湿作业的项目
Offering Details
Technical Details & Applications
TRD Wall Formation
TRD (Trench Cutting Re-mixing Deep Wall) inserts a chain-equipped cutter box to the design depth. As the cutter box advances horizontally, the ground is cut and mixed with cement grout to form a continuous soil-cement wall of consistent thickness.
The soil-cement wall provides ground improvement and groundwater cutoff. Where structural retaining capacity is required, the wall is combined with the structural elements specified for the project.
技术说明与应用案例
TRD 等厚水泥土连续墙成墙原理
TRD（Trench Cutting Re-mixing Deep Wall，等厚水泥土连续搅拌墙）工法将附有切割链条和刀头的切割箱插入地下至设计深度，通过横向推进切割地层，并注入水泥浆与原状土搅拌，形成连续等厚的水泥土墙。
水泥土墙承担土体改良与止水功能；需要满足结构挡土要求时，结合工程设计配置相应的结构构件。
TRD cutting and mixing principle. This diagram illustrates TRD wall formation, not the detailed structural arrangement of TAD precast panels.
TRD 切割搅拌成墙原理。本图用于说明 TRD 成墙过程，不代表 TAD 预制墙板的具体结构构造。
TAD Precast Assembled Diaphragm Wall
TAD inserts prestressed precast reinforced-concrete panels into the trench-cut soil-cement wall. Tongue-and-groove or interlocking connections link adjacent panels, while the surrounding soil-cement forms the cutoff zone. The assembled wall combines earth-retaining and groundwater-cutoff functions.
Construction coordination covers the relationship between wall formation and panel installation, panel position and verticality, connection details, and the excavation sequence. Panel sizes and wall dimensions are determined to meet project requirements.
TAD 预制装配式地下连续墙
TAD 工法在渠式切割形成的水泥土连续墙中插入预应力钢筋混凝土预制墙板。相邻墙板通过榫卯或锁扣构造连接，周边水泥土形成止水层，共同组成兼具挡土与止水功能的装配式地下连续墙。
施工中统筹成墙与插板衔接、预制板定位及垂直度、连接构造和后续开挖顺序。板材尺寸与墙体参数按具体工程确定。
TAD precast-panel installation, illustrating the panel-placement stage of the assembled wall system.
TAD 预制墙板安装过程，展示装配式墙体的插板施工环节。
Shanghai Pudong Airport South Area Underground Transport Hub
The first-stage J1-1 to J1-7 excavation zones of the South Area Underground Transport Hub and Supporting Works at Shanghai Pudong Airport covered approximately 32,000 m².
The project adopted an 850 mm thick soil-cement wall with 600 mm or 650 mm concrete precast panels inserted to form the TAD retaining and groundwater-cutoff system.
上海浦东机场南区地下交通枢纽及配套工程
上海浦东机场南区地下交通枢纽及配套工程第一阶段 J1-1 区至 J1-7 区基坑总面积约 32,000 m²。
项目采用 850 mm 等厚水泥土连续墙，墙内插入 600 mm 或 650 mm 混凝土预制板材，形成 TAD 围护及止水体系。
Exposed wall after excavation, showing the installed precast concrete panels.
基坑开挖后露出的墙体，展示预制混凝土墙板安装效果。
- The wall system passed project acceptance. On this project, compared with the conventional steel-section soil-cement mixing-wall scheme, monitoring and testing costs were reduced by approximately RMB 1 million and the construction schedule was shortened by about 30 days.
- 该墙体体系已完成项目验收。在本工程中，相较传统型钢水泥土搅拌墙方案，节约监测和检测费用约 100 万元，并缩短建设工期约 30 天。
Overall view of the excavated pit, perimeter wall, and internal bracing at the Pudong Airport project.
浦东机场项目基坑开挖整体效果，展示周边围护墙与坑内支撑布置。
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