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Milling Mall Construction Method Case Study: Ise Bay Crossing Gas Pipeline Installation Project

Milling Mall Construction Method Case Study: Ise Bay Crossing Gas Pipeline Installation Project

Immediately after departure, excavate the stone masonry wire cage and tetrapod section of about 20 meters!

The construction site for the Ise Bay Crossing Gas Pipeline installation encountered the discovery of old stone masonry (large boulders) in addition to results from prior magnetic surveys indicating some metal reactions, leading to the adoption of the milling mole method. During the excavation of the launch shaft, the stone masonry and tetrapods that were unearthed were significantly larger than the nominal diameter of φ1000mm, making cutting very difficult. The thrust pipes also utilized composite steel pipes with rolling prevention features specifically designed for milling. During construction, fragments of large boulders and wire were discovered, and it is believed that the metal reaction was due to this wire, which was likely associated with the large boulders contained in a wire cage. 【Construction Case】 ■ Project Name: Ise Bay Crossing Gas Pipeline Installation (Gas Conduit Construction) ■ Client: Toho Gas Co., Ltd. ■ Contractor: Kajima Corporation ■ Pipe Diameter: 1000 ■ Thrust Length: 68.47m ■ Soil Type: Riprap, Sandy Soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=50 G=80% φmax=1000mm ■ Construction Period: 2011.12.11 to 2012.2.8 (2 months) ■ Type of Obstacle: Wire, Tetrapod Old Stone Masonry (Large Boulders) *For more details, please refer to the PDF materials or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: Supply Work for the Nishishinbashi 1-Chome Project

Milling Mall Method Construction Case: Supply Work for the Nishishinbashi 1-Chome Project

All-rounder for construction work! Cutting 8 pieces of obstacle H300 at 4 locations!

This is an introduction to the achievements of the new construction work for the Hibiya Route tunnel as part of the Nishishinbashi 1-chome project supply work. After starting, we cut the first obstacle H300 at about 10 meters, and then continued to cut the second and third H300 obstacles at intervals of about 2 meters. We planned to cut the remaining three H300 obstacles before reaching the destination. However, in reality, we only cut up to the third obstacle from the beginning, and we did not encounter the remaining three obstacles (H300). 【Construction Case】 ■ Project Name: New construction work for the Hibiya Route tunnel as part of the Nishishinbashi 1-chome project supply work (Part 1) ■ Client: Marunouchi Thermal Supply Co., Ltd. ■ Contractor: Takeuchi Civil Engineering Co., Ltd. ■ Pipe Diameter: 2000 ■ Pushed Length: 78.30 m ■ Soil Type: Sandy Silt ■ N Value/Gravel Rate/Maximum Gravel Diameter: N=2 G=0% φmax=0mm ■ Construction Period: 2011.12.11 to 2012.2.8 (2 months) ■ Type of Obstacles: H-300, 4 locations, 8 pieces * For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: Reconstruction near Kasumigaseki 2-chome Part 2 Project

Milling Mall Method Construction Case: Reconstruction near Kasumigaseki 2-chome Part 2 Project

Cutting unexpected H-beams in six locations! A case study of construction work for thrusting on a heavily trafficked main road.

This is an introduction to the construction achievements of the reconstruction project near Nagatacho 1-chome and Kasumigaseki 2-chome, Chiyoda Ward, Phase 2. Initially, there was a possibility of two locations with reinforced concrete in the thrust pipeline section, and the thrust construction was conducted on a heavily trafficked main road. As a result of the construction, after cutting the reinforced concrete at two locations, we encountered unexpected obstacles. The unexpected obstacles were H-beams measuring H250 to H350, and we subsequently cut through six unexpected H-beams. 【Construction Case】 ■ Project Name: Reconstruction Project near Nagatacho 1-chome and Kasumigaseki 2-chome, Chiyoda Ward, Phase 2 ■ Client: Tokyo Metropolitan Sewerage Bureau ■ Contractor: Muramoto Construction Co., Ltd. Tokyo Branch ■ Pipe Diameter: 1500 ■ Thrust Length: 94.700 m ■ Soil Type: Clay ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=1-2 G=0% φmax=0mm ■ Construction Period: April 2015 to August 2015 (3.5 months) ■ Type of Obstacles: Reinforced concrete 2m thick at 2 locations 　　　　　　　Unexpected obstacles 　　　　　　　H-beams H-250 to H-350 at 6 locations *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: Sewer Pipe Installation Work in Umiyama Town

Milling Mall Method Construction Case: Sewer Pipe Installation Work in Umiyama Town

Cutting of Storage Steel Sheet Pile Type III! Construction Case in Areas Where Road Regulations are Difficult.

We would like to introduce the construction results of the sewer pipe installation project in Umiyama Town, commissioned by the Sakai City Waterworks Bureau. It was believed that there was one location with a Type III steel sheet pile in the thrust pipeline section. The road where the thrust pipe was to be laid is a major thoroughfare with heavy traffic, making it difficult to regulate the road, so the project involved cutting the existing Type III steel sheet pile. As a result of the construction, one Type III steel sheet pile was cut. 【Construction Details】 ■ Project Name: Umiyama Town Sewer Pipe Installation Project ■ Client: Sakai City Waterworks Bureau, Sewer Division, Sewer Construction Section ■ Contractor: Union Tech Co., Ltd. ■ Pipe Diameter: 1100 ■ Thrust Length: 69.840m ■ Soil Type: Sandy Soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=4-9 G=0% φmax=57mm ■ Construction Period: August 2015 to September 2015 (1 month) ■ Type of Obstacle: Type III Steel Sheet Pile, 1 location *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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[Milling Mall Construction Method Case Study] Kishiwada City

[Milling Mall Construction Method Case Study] Kishiwada City

Addressed obstacles in six locations! We were able to achieve significant results in the construction project ordered by Kishiwada City.

In January 2012, we would like to introduce the achievements of the obstacle removal work that was successfully completed after cutting six steel sheet piles of Type III at a construction site ordered by Kishiwada City, Osaka Prefecture. After a thrust length of 432 meters with a diameter of 1000mm, we encountered the first obstacle approximately 100 meters after starting, followed by six consecutive encounters with obstacles over a distance of about 30 meters, with the remaining 222 meters being pushed through normally. The tunneling machine detected obstacles six times, cut through them six times, and reached the target with high precision using an electromagnetic wave guidance surveying device. 【Construction Case】 ■ Project Name: Kishiwada City Public Sewerage Section 1 Pipe Laying Work ■ Client: Kishiwada City, Osaka Prefecture ■ Contractor: Joto Construction Co., Ltd. ■ Pipe Diameter: 1000mm ■ Thrust Length: 432.34m ■ Soil Type: Sandy gravel ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=33 G=51% φmax=200mm ■ Construction Period: 2011.12.20 to 2012.3.15 (3 months) ■ Type of Obstacles: Six locations of steel sheet piles Type III *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: Sanjiyachishima Main Line Diversion Pipe Construction Project

Milling Mall Method Construction Case: Sanjiyachishima Main Line Diversion Pipe Construction Project

Cutting at three locations in Matsuhang! Responding with forward exploration using electromagnetic waves and excavation management with a data logger.

This document introduces the construction achievements of the construction work for the Sangenya Chishima main line diversion pipe in Osaka City. Due to the presence of obstacles in the form of wooden piles, forward exploration using electromagnetic waves and excavation management using data loggers were conducted. Since the obstacles were wooden piles, no increase in excavation torque or thrust was observed, and the presence or absence of obstacle cutting was confirmed by the discharge of wood chips. 【Construction Case】 ■ Project Name: Sangenya Chishima Main Line Diversion Pipe Construction (Part 1) ■ Client: Osaka City Construction Bureau ■ Contractor: Kitabume Corporation ■ Pipe Diameter: 800 ■ Pushing Length: 127.61m ■ Soil Type: Sand and Silt ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=7 G=0% φmax=0mm ■ Construction Period: July 2, 2013 – August 10, 2013 (1 month) ■ Type of Obstacle: Wooden Piles φ150×3 pieces *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Construction Method Case Study: Onjigawa East Drainage Area Section 42 Sewer Construction

Milling Mall Construction Method Case Study: Onjigawa East Drainage Area Section 42 Sewer Construction

All-rounder in construction work! A case study of cutting φ1800 concrete pipes!

This is an introduction to the achievements of the sewer construction work for the Onjigawa East Drainage Area, Section 42, which was carried out in the fiscal year 2012. Immediately after the start, the existing push pipe, a φ1800mm concrete pipe, was cut diagonally over a distance of 8.21m due to obstacles, and then normal excavation was performed to reach the existing special manhole. At the existing manhole, the head was completely damaged, and the plan was to disassemble and recover everything else. 【Construction Case】 ■ Project Name: Sewer Construction for Onjigawa East Drainage Area, Section 42, Fiscal Year 2012 ■ Client: Yao City, Osaka Prefecture ■ Contractor: Asanuma Corporation ■ Pipe Diameter: 1800mm ■ Pushing Length: 119.86m ■ Soil Type: Sandy Soil, Clayey Soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=13, G=4%, φmax=19mm ■ Construction Period: 2013.06.01 to 2013.08.30 (3 months) ■ Type of Obstacle: φ1800 Concrete Pipe, 8.2m *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: Nishinari Branch Pipe 800mm Water Supply Pipe Installation Work

Milling Mall Method Construction Case: Nishinari Branch Pipe 800mm Water Supply Pipe Installation Work

All-rounder of construction work! A case study of cutting steel sheet piles Type III!

This construction involved the installation of water pipes, where a φ1000 thrust pipe was pushed through, followed by the insertion of a φ800mm water supply pipe. After approximately 161 meters from the start, the first obstacle was cut, and normal thrusting continued for about 7 meters. Subsequently, the second obstacle was cut, allowing normal thrusting to reach the remaining 244 meters. During the approximately 9-meter section crossing the national road, excavation was carried out while injecting chemical agents inside the machine. As a result of the construction, there was no metal reaction from the first obstacle. After injecting chemical agents inside the machine and proceeding with thrusting, a metal reaction from the second obstacle was confirmed, and cutting of the obstacle began, with the discharge of metal fragments being verified. 【Construction Example】 ■ Project Name: Nishi-Nari Branch Pipe (Nishi-Nari) 800mm Water Supply Pipe Installation ■ Client: Osaka City Waterworks Bureau ■ Contractor: Mori-gumi & Hanshin Construction Joint Venture ■ Pipe Diameter: 1000 ■ Thrust Length: 411.65m ■ Soil Type: Sandy Soil, Clayey Soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=10, G=0%, φmax=0mm ■ Construction Period: Day and Night Work (8h) for 4.0 months (2014.2.5 – 2014.5.10) ■ Type of Obstacle: Steel Sheet Pile Type III, 1 location *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: Edogawa Left Bank Area Sewer Pipe Construction Work

Milling Mall Method Construction Case: Edogawa Left Bank Area Sewer Pipe Construction Work

All-rounder in construction work! A case study of soil cutting for an inserted caisson.

This is an introduction to the construction achievements of the Edo River Left Bank Drainage Area Sewer Pipe Construction Project. During the construction of the lower section (φ1350mm mud water method, executed by another company), there was a hard soil-like obstacle that caused damage to the bit, leading to a design change at the site. To safely carry out the launch and arrival, a pressure-in caisson wall (originally planned to be unreinforced, but actually contained some reinforcement) was cut to L=0.9m on the launch side and L=0.3m on the arrival side. 【Construction Case】 ■ Project Name: Edo River Left Bank Drainage Area Sewer Pipe Construction (Ichikawa Main Line Section 502-2) ■ Client: Chiba Prefecture Edo River Sewer Office ■ Contractor: Hodota Corporation ■ Pipe Diameter: 1350mm ■ Pushing Length: 142.921m ■ Soil Type: Sandy soil and clayey soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=Average 18.5 ■ Construction Period: Daytime construction (8h) (10h during cutting) 2.5 months (2014.12.01 – 2015.2.13) ■ Type of Obstacle: Soil of the pressure-in caisson (Launch side L=0.9m, Arrival side L=0.3m) (Not detected this time, assumed to be H steel of SMW) *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: Onjigawa East Drainage Area Section 5 Sewer Construction

Milling Mall Method Construction Case: Onjigawa East Drainage Area Section 5 Sewer Construction

All-rounder in construction work! A case study of cutting three PC piles with a diameter of 250mm.

This document introduces the construction achievements of the 5th section of the Onjigawa East Drainage Area sewer construction for the fiscal year 2013. It is believed that there are supporting piles (PC piles φ250mm at 3 locations) for the retaining wall of the side road in the push pipe section, and furthermore, the road where the push construction is to be carried out is a major road with heavy traffic, making road regulation difficult. The construction was carried out using the milling mole method, and the PC piles φ250mm at 3 locations were cut. 【Construction Case】 ■ Project Name: Sewer Construction for the 5th Section of the Onjigawa East Drainage Area for Fiscal Year 2013 ■ Client: Yao City, Osaka Prefecture ■ Contractor: Toda Corporation & Bun-Iwa Group Joint Venture ■ Pipe Diameter: 1650 ■ Pushing Length: 325.470m (200R 1 curve) ■ Soil Type: Sandy soil and clayey soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=50 G=0% φmax=19mm ■ Construction Period: Night work (8h) for 5 months (2014.11 to 2015.3) ■ Type of Obstacle: PC piles φ250mm at 3 locations *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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[Milling Mall Method Construction Case] New Tunnel Construction for the 2-1 Planning Route in the Temachi Area

[Milling Mall Method Construction Case] New Tunnel Construction for the 2-1 Planning Route in the Temachi Area

All-rounder in construction work! Examples of cutting through 1m thick reinforced concrete walls, etc.

This document introduces the construction achievements of the new tunnel construction for the Otemachi District 2-1 planned route. In carrying out this construction, there was a possibility that underground connecting passages and foundation piles for the Tokyo Metro Marunouchi Line were present in the push pipeline section. The locations of the foundation piles were in a busy urban area with heavy road traffic, and since the burial depth of the push pipeline was very deep, it was necessary to ensure safe construction for both the launch and arrival. In the actual construction, there were no piles, and we cut 6 layers of the arrival shaft liner, 5 H-150mm pipes, and a 1m reinforced concrete wall of the manhole. 【Construction Case】 ■ Project Name: New Tunnel Construction for Otemachi District 2-1 Planned Route ■ Client: Marunouchi Heat Supply Co., Ltd. ■ Contractor: Shimizu Corporation ■ Pipe Diameter: 2600 ■ Pushing Length: 159.601m ■ Soil Type: Silty clay ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=19 ■ Construction Period: Day and night construction (17.5h) for 4 months (2014.12 to 2015.3) ■ Type of Obstacle: 1m thick reinforced concrete wall of the manhole, 5 H-150 pipes, 6 layers of liner *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: Water Distribution Main Replacement Work

Milling Mall Method Construction Case: Water Distribution Main Replacement Work

It has been adopted for construction where there is a possibility of wooden stakes with a diameter of 300 mm existing in the pipeline section.

This is an introduction to the construction results of the replacement work for the water supply main (800mm and 500mm) between the vicinity of 1-chome, Nihonbashi Horitakemachi, Chuo Ward, and the vicinity of Nihonbashi Hisamatsu-cho, Chuo Ward. Initially, there was a possibility of wooden piles with a diameter of 300mm existing in the push pipe section; however, as a result of the construction, there were no wooden piles with a diameter of 300mm. 【Construction Case】 ■ Project Name: Replacement work for the water supply main (800mm and 500mm) between the vicinity of 1-chome, Nihonbashi Horitakemachi, and the vicinity of Nihonbashi Hisamatsu-cho, Chuo Ward ■ Client: Tokyo Metropolitan Waterworks Bureau ■ Contractor: PS Mitsubishi Corporation ■ Pipe Diameter: 1200mm ■ Pushing Length: 36.628m and 133.936m ■ Soil Type: Sandy silt ■ N Value/Gravel Rate/Maximum Gravel Diameter: N=1 to 4, G=0%, φmax=0mm ■ Construction Period: May 2015 to July 2015 (2.5 months) ■ Type of Obstacle: Insurance method, no obstacles *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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Milling Mall Method Construction Case: New Pipeline Construction for Oi Thermal Power Plant Substation

Milling Mall Method Construction Case: New Pipeline Construction for Oi Thermal Power Plant Substation

It's not surprising if anything comes out; the entire site is an example of land reclamation excavation.

This document introduces the construction achievements related to the new pipeline installation work at the Oi Thermal Power Plant. This project involved the installation of new pipelines within the Oi Thermal Power Plant, and due to the site being filled, it was uncertain whether sheet piles or H-beams would be encountered; it was possible to find concrete debris or metal fragments, among other things. In reality, only pine piles and what appeared to be concrete debris from some base were encountered, and the use of expansion jacks was not necessary. 【Construction Case】 ■ Project Name: New Pipeline Installation Work Related to Oi Thermal Power Plant ■ Client: Tokyo Electric Power Company Holdings, Inc. ■ Contractor: Wakachiku Construction Co., Ltd. Tokyo Branch ■ Pipe Diameter: 1350 mm ■ Pushing Length: 190.5 m ■ Soil Type: Clayey Soil ■ N Value / Gravel Ratio / Maximum Gravel Diameter: N=2–10 G=0% φmax=100 mm ■ Construction Period: August 2015 to October 2015 (2.5 months) ■ Type of Obstacles: Insurance Method, Pine Piles, Concrete Debris, Wood Pieces *For more details, please refer to the PDF document or feel free to contact us.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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[Video Available] Measures against abnormal weather, guerrilla rainstorms, and rainwater!

[Video Available] Measures against abnormal weather, guerrilla rainstorms, and rainwater!

No worries if obstacles appear underground! The tunneling machine detects and captures obstacles about 2 meters ahead, allowing for cutting of the obstacles! [Performance report available]

Due to the progress of global warming, abnormal weather such as guerrilla rainstorms is occurring more frequently. We want to carry out sewer construction and advance rainwater measures, but we often hear that construction is not progressing due to a lack of personnel caused by Olympic construction and other projects. Even when construction begins, there are often obstacles buried underground that prevent progress, leading to wasted time and money. Therefore, we recommend the milling mole method, which is safe even when underground obstacles are encountered! The "milling mole method," equipped with four special functions: "exploration, improvement, cutting, and guidance," consists of three devices: a tunneling machine, special bits, and a special telescopic pipe, allowing for the precise cutting and removal of underground obstacles. Using electromagnetic waves, it explores and pushes forward while tunneling through metal obstacles ahead, and it is also possible to improve the ground from within the tunneling machine before and after the detected obstacles. If an obstacle is detected, a special telescopic device can be used to cut through the underground obstacle at ultra-low speed, allowing for continued advancement. The system also includes the installation of a receiving coil at a designated position within the access shaft to guide the tunneling machine to that location, making it a high-precision advancement method even when obstacles are present.

  • Site and ground investigation
  • Civil Engineering Method
  • Special Construction Method

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