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Iseki Micro Tunneling

Microtunneling is a trenchless construction method used to install pipelines beneath highways, railroads, runways, harbors, rivers, and environmentally sensitive areas. Microtunneling is defined as a remotely-controlled, guided, pipe-jacking operation that provides continuous support to the excavation face by applying mechanical or fluid pressure to balance groundwater and earth pressures. Support at the excavation face is a key feature of microtunneling, distinguishing it from traditional open-shield pipe-jacking. Microtunneling requires jacking and reception shafts at the opposite ends of each drive. TPipe Jaking & Microtunnelinghe microtunneling process is a cyclic pipe jacking operation. A microtunnel boring machine (MTBM) is pushed into the earth by hydraulic jacks mounted and aligned in the jacking shaft. The jacks are then retracted and the slurry lines and control cables are disconnected. A product pipe or casing is lowered into the shaft and inserted between the jacking frame and the MTBM or previously jacked pipe. Slurry lines and power and control cable connections are made, and the pipe and MTBM are advanced another drive stroke. This process is repeated until the MTBM reaches the reception shaft. Upon drive completion, the MTBM and trailing equipment are retrieved and all equipment removed from the pipeline.Most microtunneling operations include a hydraulic jacking system to advance the MTBM and pipe string, a closed loop slurry system to transport the excavated spoils, a slurry cleaning system to remove the spoil from the slurry water, a lubrication system to lubricate the exterior of the pipe string during installation, a guidance system to provide line and grade control, an electrical supply and distribution system to power equipment, a crane to hoist pipe sections into the jacking shaft, and various trucks and loaders to transport spoil off site. MTBMs have a rotating cutting head to excavate the ground material, a crushing cone to crush larger particles into smaller sizes for transport through the slurry lines, a hydraulic or electric motor to turn the cutting head, a pressurized slurry mixing chamber behind the cutter head to maintain face stability, an articulated steering unit with steering jacks for steering corrections, various control valves, pressure gauges, flow meters, and a data acquisition system. Additionally, the MTBM has in-line cameras to relay information to the operator and a target system for guidance control.

Precise control of line and grade is accomplished using the guidance system and steering jacks to locate and steer the MTBM during a microtunneling drive. The guidance system usually consists of a reference laser mounted in the jacking shaft, which transmits a beam onto a target mounted inside the articulated section of the MTBM. This and other operational information is transmitted through wire cables to a control cabin located on the surface. Microtunneling machines are capable of independently counter-balancing earth and hydrostatic pressures. Earth pressure is counter-balanced by careful control of advance rates and excavation rates of spoil materials. Groundwater pressure is counter-balanced by using pressurized slurry in the soil-mixing chamber of the MTBM.

Microtunneling Control Container The Control Container is the control center for all microtunneling functions. It houses the control console, motor control centers for slurry pumps, MTBM drive motor and the bulkhead panel for electrical and communications connections. The Remote Control Container provides hydraulic power to the microtunneling jacking frame and for auxiliary functions. Control Container Spec Sheet (Gen. 3) Remote Hydraulic Control Container (Gen. 3) Microtunnel Boring Machine (MTBM) Our MTBMs can be equipped with the appropriate cutter face for soft ground, mixed ground and rock for precise ground excavation. The guidance system reports the MTBM’s pitch and yaw statistics to a monitor in the control console for operator assessment.

Microtunneling Definition and History Microtunneling is a process that uses a remotely controlled Microtunnel Boring Machine (MTBM) combined with the pipe jacking technique to directly install product pipelines underground in a single pass. This process avoids the need to have long stretches of open trench for pipe laying, which causes extreme disruption to the community. microtunneling has been used to install pipe from twelve inches to twelve feet in diameter. Therefore, the definition for microtunneling does not necessarily include size. Microtunneling has evolved to describe a tunneling process where the workforce does not routinely work in the tunnel. Microtunneling is currently the most accurate pipeline installation method. Line and grade tolerances of one inch are the microtunneling industry standard. This can be extremely important when trying to install a new pipeline in an area where a maze of underground utility lines already exists. Microtunneling was developed by the Japanese in the early 1970’s to replace open sewers in urban areas with underground gravity sewers. The first microtunneling project in the U.S. occurred in south Florida in 1984.This was a 600 foot crossing with 72" pipe under I 95 and the FEC Railroad. Although originally designed for gravity sewer construction, microtunneling installations include underground crossings of highways, railroads, runways, rivers, and environmentally sensitive areas for a variety of utilities. This process has also been used to install plant intakes and outfalls. Microtunneling is also used in the pipe arch technique of supporting large underground openings with an arch or roof made up of small tunnels.  jacking system to pipejack the pipeline; a closed loop slurry system to remove the excavated tunnel spoil; a slurry cleaning system to remove the spoil from the slurry water; a lubrication system to lubricate the exterior of the pipeline during installation; a guidance system to provide installation accuracy; an electrical supply and distribution system to power all of the above equipment. Top side equipment used to support the tunneling operation usually includes a crane; pile driving and dewatering equipment for shaft construction; backhoe and front end loader for shaft excavation and spoil handling; and truck transport for equipment moves.

Microtunneling is state of the art remote-controlled pipe jacking by computer, which is why we call it “Digital Age Tunneling”. One person above ground operates the microtunneling system using a computer to advance and steer the microtunnel boring machine, jack the pipe, and excavate the soils. When computerization is combined with slurry microtunneling’s ability to balance both groundwater and earth pressures, you have a truly revolutionary tunneling method for installing 18” to 96” OD tunnels. The microtunneling method can be either “one pass” with the permanent carrier pipe jacked directly in place or “two pass” with a permanent carrier pipe installed inside a temporary tunnel casing jacked in place. One pass is the most efficient and least costly method of tunneling. Pilot tube microtunneling (PTMT), also known as guide bore microtunneling (GBM), combines the accuracy of visual theodolite guidance with the cost advantages of ultra-small access shafts (<12’ OD) and one pass pipe jacking of 6” to 30” OD carrier pipes. Guided auger boring uses the same pilot tube system as PTMT/GBM to install auger bored steel casing up to 48” in diameter within 1”+/- of the designed elevation and alignment. Is slurry type microtunneling the best method?What are the jacking length limits?Should it be one pass or two pass pipe jacking?

Microtunneling system is a remotely controlled method for driving concrete, steel and CTP pipes under the surface. This system is primarily applied into areas where main road, railway, subway lines, airport and river passing; and areas where open excavation is risky. In these areas, the potable water, sewage, natural gas, connection tunnels and similar projects can successfully be conducted by the microtunneling machines whose diameter vary between 800 mm – 3000 mm, and which are produced by ourselves. MICROTUNNEL SYSTEM PROCEDURE In microtunneling system, the pipes which form the microtunnel are driven into the tunnel by the pushing force of the hydraulic pistons. The system control is done at the control cabin on the ground. This method has three basic system components: 1. Pushing pipes 2. Pushing equipment 3. Pushing and exit shafts In microtunnels systems which is build by Pipe laying method, the microtunnel machine mines the tunnel, and the impulsion equipment spontaneously push the pipes in the area which is mined. While the cutting head is pushed forward by the hydraulic thrust system, a new pipe is connected once there is enough space to thrust another pipe; and the thrust procedure continues this way. The microtunnel machine parts the soil by cutting and crushing bits, then the system jets pressurized water, making the material a liquid slurry mud. This liquid mud is absorbed by the discharging pumps which are present in the system; and they are taken into the discharge tank which lays on the surface. The measurement procedure in microtunneling methods is a continuous data receiving process between the machine and the control panel which exists in the control cabin on surface. The data received are assessed by the operator who runs the control panel, and the operator prevents the machine get out of the foreseen variation boundaries. The data are assessed in the computer in the control cabin, and the horizontal and vertical positions of the machine are viewed quantitatively and graphically on the control panel. In graphical view, the position of the main body of the machine, the position of the cutting head and the adjusted constant position of the machine are shown in different colors on milimetric grids on the monitor. With this control system, the operator can intervene instantly and an accuracy of +/- %0,01 is obtained. Microtunnelling system, remote controlled, concrete, steel and GRP pipes under the floor is a method used for installation in. This system is usually by road, rail, metro lines, airports and river crossings to open excavation is applied in hazardous areas. To be applied in such areas, drinking water, sewage, natural gas, connecting tunnels and similar projects Microtunnel machines with our own production to 800 mm – 3000 mm in diameter are carried out.

Target provides Micro Tunneling, Pipe Jacking, Directional Drilling, Shaft Sinking, Sewer Rehab, Auger Boring and Pipe Ramming in Kuwait Oman Qatar Bahrain and United Arab Emirates UAE

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