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Introduction
- A method on site concreting of Slurry Wall is used to build reinforced concrete wall sequentially while excavating the ground using underground excavation equipment, a rotary excavator, and filling the Bentonite stabilizer liquid to prevent the hollow wall collapse.
- This method started to be applied to dam construction site in Europe in 1950s. In Korea, It was introduced into construction of Yeouido Lucky GumSung office building in the early 1980s.
- In the early stage of introduction Clamshell excavation method which is impact technique using Hang Grab was used. However, after development of Hydrofraise, rotating Hydraulic excavation equipment, it turns non-impact excavation technique,
- thus it is possible to construct the wall the deep depth as it minimizes impact of the vibration on the field, develops straightness, and improves the quality of the joint between the panel by cutting the construction wall.
Summary
- Application of construction method Slurry Wall is used as earth retaining wall or waterproof wall, thus it is diversely applied to underground structures, subsurface dams, subways, underground roads, underground storage, construction wall, Barrette pile, Dam base, and foundation of bridge structure.
① Primary excavation ② Primary Panel 1st Byte Excavation ③ Primary Panel 2nd Byte Excavation④ Primary Panel Center Byte Excavation ⑤ Placing of steel reinforcement and Concreting
⑥ Another Primary Penel Excavation and Concreting ⑦ Trailing Panel Excavating ⑧ Placing of steel Reinforcement of Trailing Panel and Concreting ⑨ Repeated Excavation of Primary and Trailing Panel
Advantages
| Low noise and vibration-free method using rotary excavator |
| Good waterproofing and high rigidity of the wall to protect surrounding structures |
| Smallest settlement of surrounding ground, making it suitable for urban construction |
| Maximize the use of underground space by utilizing the retaining wall of this structure |
| It is a relatively safe process against bad conditions such as excessive groundwater, rock formation, soft ground |
| When the Open-Cut method is applied, the gap of the support is large, so the construction is easy by reducing the interference of earth excavation step and underground frame construction. |
Disadvantages
| Requires substantial technical accumulation |
| Continuous design needs to be supplemented for permanent walls |
| Special equipment and plant facilities are large and complex, suitable for the site over a certain scale (about 1300 Special equipment and plant facilities are large and complex, suitable for the site over a certain scale (about 1300㎡) |
| Cost of construction is relatively high. (At the time of simple construction cost comparison) |
| Difficult quality control is required. |
Equipment Introduction
Rotary excavator (HYDRO FRAISE TRENCH CUTTER)
- Hydrofraise will be equipped with Heavy Duty Crane, and two Cutter Drums in the lower part of body attached with TIP made of Tungsten Carbide material spin counter of each other by means of hydraulics, and keep excavating. Power Pack equipped with Crane provide hydraulics to Motor that drives Drum inside of Hydrofraise, and to Bentonite Slurry, as well as to Motor that drives high-performance pump which pull out and lift the excavated earth and sand, and smashed rock.
- Steel Frame of the Body induces vertical excavation, and it consists of Body Frame and Guide Frame that are designed to maintain a constant speed for Drum rotation and excavation according to Hydraulic Feed Cylinder.
- Cutter of HYDROFRAISE shapes the joint while cutting the joint region of leading type panel already casted concrete less than 10cm, so it does not need joint mechanics separately. Whole process is continued having circulated Bentonite liquid and the excavated earth and sand together, so that it has advantage in that it is possible for concreting right after excavation.
- Excavation by HYDROFRAISE can be widely practiced in the variety of soil condition (clay, sand, gravel stratum, underlying rock formation), and excavation speed is in inverse proportion to the degree of soil’s firmness.
- (Crushing Strength - 500~1000kg/㎠) There is no vibration during excavating, thus it is very suitable excavator to be used for construction within the downtown area. Having equipped with precise Inclinometer that measures precise straightness, it has very small margin of error. (less than 0.2%) The depth of excavation, generally, is 60 meters, and it is possible to excavate the depth of maximum 150 meters. So it has a constructability being able to use, under any circumstances, as of exterior walls of the underground structures.
Site list
Seoul Forest Office Building New Construction Project, Seoul
Slurry Wall 6,046㎡, PRD 856m, Earth work 52,493m³
Great Train Express(GTX) Line B, Private Investment Project
Slurry Wall 3,345㎡
Insadong Office Building, Seoul
Slurry Wall 7,979㎡, PRD 832m, Earth work 58,662m³
Udong 2nd district redevelopment project, Busan
Slurry Wall 6,669㎡, PRD 12,632m, Earth work 227,193m³
Goyang Janghang District M-1 Block Apartment Complex
Slurry Wall 32,717㎡, Guide wall 857m, PRD 21,324m
Icheon Anheung-dong local housing association apartment complex construction project
Slurry Wall 12,453㎡, PRD 24,134m, Earth work 244,594m³
Seongsu-dong 2-ga Office Building, Seoul
Slurry Wall 5,220㎡, PRD 1,520m, Earth work 85,811m³
Dangsan Rental Housing Construction
Slurry Wall 5,822㎡, Guide wall 220m
Sinpyeong Knowledge Industry Center, Busan
Slurry Wall 16,597㎡, Guide wall 394m, EGM 4,536m
Busan Believe Myeongji Duclass new construction construction*
Slurry Wall 9,095㎡, Barrett 134ea
Cheonggye Regional Housing Association Residential Complex
Slurry Wall 6,799㎡, PRD 3,439m, Earth work 109,200m³
Hyundai Motor Group GBC, Section 2, Seoul
Slurry Wall 13,479㎡, CIP 15,925m
Godeok Biz Valley Self-sufficient District 2-3 Business Facility, Seoul
Slurry Wall 7,237㎡, PRD 1,606m, Earth work 86,433m³
Yongsan International B/D, District 5, Seoul
Slurry Wall 6,761㎡, Guide wall 229m
Hillstate The Unjung, Paju
Slurry Wall 21,563㎡, Guide wall 1,065m
Cheongju Express Terminal (Residential-Commercial Complex)
Slurry Wall 8,554㎡, Guide wall 222m
Cheongju Express Terminal (Terminal)
Slurry Wall 16,742㎡, Guide wall 400m
Magok District CP4 Development Project
Slurry Wall 14,182㎡, Guide wall 390m
Great Train Express(GTX) Line A. Section 3
Slurry Wall 7,905㎡, Guide wall 234m
Goyang Deokeun District Commercial Building
Slurry Wall 4,877㎡, Underpinning 1,868m
Dangsan-dong Youth Housing, Seoul
Slurry Wall 10,157㎡, PRD 2,623m, Earth work 133,526m³
Yeouido Meritz site officetel, Seoul
Slurry Wall 5,536㎡, PRD 1,134m, Earth work 46,365m³
Sangam Data Center, Seoul
Slurry Wall 4,222㎡, Guide wall 169m
Incheon Cheongna B5-1-1BL Business Facility
Slurry Wall 8,437㎡, Guide wall 267m, PRD 1,753m
Yangsan Jungbu Residential Complex, Yangsan
Slurry Wall 8,094㎡, Guide wall 257m
Namyangju DasanJigeum Officetel
Slurry Wall 9,160㎡, Earth work 251,315m³
Jayang-dong the Raum office B/D, Seoul
Earth work, Slurry Wall 5,339㎡, PRD 3,455m
Magok May Place New Construction, Seoul
Slurry Wall 4,096㎡, Guide wall 178m, Underpinning 2,971m
Seongsu-dong Gentle Monster, Seoul
Earth work 40,599m³, Slurry Wall 3,891㎡, PRD 669m
Sewoon Redevelopment Project (Section 3-1, 4, 5), Seoul
Earth work 128,865m³, Slurry Wall 8,001㎡, PRD 3,330m
Moraenae & Seojung Market Redevelopment Project, Seoul
Earth work 157,987m³, Slurry Wall 7,193㎡, PRD 9,971m
Gasan Biz Metro 2nd, Seoul
Earth work 126,462m³, Slurry Wall 8,475㎡, PRD 2,020m
Incheon Cheongna B5-1-1BL Business Facility
Earth work 59,140m³, Slurry Wall 5,807㎡, PRD 1,639m
Busan Station Samhan Golden View Edu Station
Slurry Wall 10,102㎡, PRD 8,120m
Misa District Central Commercial Area 11-1BL, Hanam
Slurry Wall 4,361㎡
Gwangmyeong Station Complex Complex PF Project Phase 2
Slurry Wall 28,795㎡, PRD 16,943m
Cheongna Office B/D( C3-19BL), Incheon
Slurry Wall 6,044㎡, PRD 915m
Yeongjongdo Seaside Park Residence
Slurry Wall 7,157㎡
Sasang Regional Housing Association APT, Busan
Earth work, Slurry Wall 11,768㎡
Desian Studio, Busan
Earth work, Slurry Wall 9,335㎡, PRD 1,704m
Daebang DM City, Busan
Slurry Wall 34,188㎡
MVL Hotel 2nd
Earth work, Slurry Wall 8,601㎡, PRD 1,416m, Barrette 3,268㎡
Noryangjin Dream Square, Seoul
Slurry Wall 9,106㎡
Misa District Central Commercial Area 12-1BL, Hanam
Earth work, Slurry Wall 12,955㎡, PRD 17,033m
Seongsu-dong Pekotech Building
Earth work, Slurry Wall 4,056㎡, PPS
Goyang Tourism Culture Complex (O1BL) Business Facility
Earth work, Slurry Wall 11,383㎡, Barrette 10,556㎡
Kolmar Korea R&D Center, Seoul
Earth work, Slurry Wall 6,352㎡, PRD 1,642m
Chungju AdministrationTown koaroo Hutis
Earth work, Slurry Wall 9,547㎡, PRD 2,371m, Barrette 965㎡
Royal Palce Busan Newport Tier 1,2
Earth work, Slurry Wall 26,031㎡, Barrette 37,769㎡, DCM 248,920m
Sangam-dong DMC Parking Complex, Seoul
Earth work, Slurry Wall 4,206㎡, H-Pile 1,509m
Pyungchon Highfield knowlegde Industry Center
Earth work, Slurry Wall 9,250㎡, PPS 1,548m
Yangsan U-Top Ubless Skyview, Gwangju
Slurry Wall 5,725㎡, PPS 855m
Cheongna Diostel, Incheon (C14-1BL)
Earth work, Slurry Wall 4,670㎡, PRD 904m, Underpinning 728m
Misa Station Hyosung Harrington Tower
Earth work, Slurry Wall 3,726㎡, PRD 1,238m, Underpinning 2,942m
Kimpo Pungmu 2 zone E-mart
Earth work, Slurry Wall 10,799㎡, PRD 3,795m
Misa E-Pyeonhansesang APT
Earth work, Slurry Wall 6,921㎡, PRD 2,283m
Wirye E-mart Town
Earth work, Slurry Wall 13,901㎡, PRD 8,364m, S-Pile 3,562m
Nice Group 1 company building
Earth work, Slurry Wall 5,333㎡
Haeundae Dongwon vista , Busan
Earth work, Slurry Wall 8,000㎡, PRD 3,349m
Kimpo Marinabay Hotel
Earth work, Slurry Wall 8,175㎡, Barrette 7,950㎡,