Earth pressure balance pipe jacking machine driven by broadsword motor?

Specifically, which EPB pipe jacking machines are driven by the big knife motor? The following Zhong Da consults the bidding teacher to answer your questions for your reference.

1 preface

Pipe jacking machine is a special tunneling machine for trenchless construction of underground pipelines (the outer diameter can reach 3.8m), and its form has developed from manual excavation to semi-mechanization. With the development of urban construction, higher requirements are put forward for environmental protection around the construction. With the accumulation of construction experience, the progress of science and technology and the improvement of electromechanical manufacturing level, the form of pipe jacking machine is developing to mechanical rotary cutting, mud-water balance, earth pressure balance and advanced models that can adapt to soft and hard soil layers. The driving forms of cutter head of pipe jacking machine are hydraulic drive and motor drive. In the early 1980s, Japan developed an EPB pipe jacking machine driven by broadsword motor. The first one in China? 1440mm large cutter head motor driven EPB pipe jacking machine was successfully developed in Shanghai in 1992. What is the second one? 2400mm plate broadsword motor drives earth pressure balance pipe jacking machine, with an outer diameter of 2900mm；; 1994 ~ 1998, successfully developed and applied in Shanghai? 1650mm, 1800mm, 3000mm (outer diameter 3540mm) and? 2000 mm earth pressure balance pipe jacking machine driven by multiple broadsword motors; Since then, relevant manufacturers in Zhenjiang, Yangzhou, Hubei and other places have also developed large-scale earth pressure balance pipe jacking machine driven by cutterhead motor; Beijing also listed the research and application technology of pipe jacking boring machine which can adapt to sandy soil layer as the scientific and technological development project of Beijing Science and Technology Commission. In 2002, 1 earth pressure balance pipe jacking machine driven by large-scale cutter-disk motor was adopted in the pipe jacking construction of Beijing sewage treatment project. At the end of 2002, Guangdong developed and successfully applied 1 EPB pipe jacking machine, which was driven by a large cutter head motor with an outer diameter of 3600 mm. At present, EPB pipe jacking machine driven by broadsword motor has become a series in China, and this pipe jacking method has also been rated as a national construction method and has been widely used.

2 earth pressure balance pipe jacking machine driven by large cutter head motor

2. 1 pipe jacking machine structure

The earth pressure balance pipe jacking machine driven by the big knife head motor mainly consists of a big knife head, a big knife head driving device, a front shell and a rear shell, a rotation stopping device, a deviation rectifying oil cylinder group, a hinged sealing device connecting the two shells, a driving screw conveyor, a hydraulic pipeline of a hydraulic power station and a deviation rectifying oil cylinder, a grease pump and a grease conveying pipeline, a mud (water) adding device, an electric control box of the driving motor and a pipe jacking console.

2.2 structural characteristics

2.2. 1 The broadsword head has no face plate and consists of 3-4 spokes or reinforcing rods (ring plates) and shaft sleeves. According to different soil properties, different cutting heads are arranged in front of the spoke plate and several stirring rods are arranged behind the spoke plate, which can continuously stir the cut soil in the sealed soil bin, so that the soil in the bin has good plasticity, fluidity and water sealing performance, and the soil can be discharged smoothly; A triangular fishtail-shaped cutter is arranged in the center of the cutter head, and grouting holes are arranged on the spokes and the center of the cutter head;

2.2.2 The broadsword disc is supported by the center without big bearing;

2.2.3 Adopting the power transmission structure of domestic planetary gear reducer and clutch, the whole cutterhead drive device has high transmission efficiency, low noise, low fever, simple installation and maintenance and reliable operation;

2.2.4 Motor-driven belt screw conveyor with no central axis, whose outlet is at the end face, can form a long soil plug, and can also transport stones and gravels of a certain size;

2.2.5 The front shell of the pipe jacking machine is equipped with a subdivision plate (with grouting pipe and earth pressure gauge) to divide the front shell into a sealed earth cabin and a power cabin. The big knife disc drive device is installed in the middle of the grid plate, and the screw conveyor is installed in the lower part of the grid plate;

2.2.6 The hydraulic power station of rectifier cylinder, electrical cabinet and grease pump are placed on the left side of the rear shell of the pipe jacking machine, and the console is installed on the right side;

2.2.7 This kind of pipe jacking machine does not need the secondary conversion process of hydraulic power equipment when it comes out of the hole, and the whole set of equipment has simple structure, convenient construction and good reliability.

2.3 working principle of pipe jacking machine

Firstly, the main jacking oil cylinder in the working well pushes the pipe jacking machine forward, and at the same time, the big blade rotates to cut the soil, and the cut soil enters the sealed soil bin and the screw conveyor and is extruded to form compressed soil with a certain soil pressure; Through the rotation of the screw conveyor, the cut soil is transported out. The earth pressure in the sealed soil bin can be controlled by the excavation amount of the screw conveyor or the advancing speed of the pipe jacking machine, so as to keep the earth pressure in balance with the static earth pressure and groundwater pressure in front of the excavation face, thus ensuring the stability of the excavation face and preventing the ground from settling or heaving.

Because the broadsword disc has no face plate, its opening rate is close to 100%, so the earth pressure measured by the earth pressure gauge on the partition plate is close to that on the excavation face.

According to the characteristics of different strata in the excavation face of the pipe jacking machine, fresh water, clay slurry (or bentonite slurry), mud with various proportions and concentrations or foaming agents are added to the front face of the cutter head and the soil bin, so that hard clay, sand, water-bearing sand and gravel soil which are generally difficult to construct are transformed into muddy soil with plasticity, fluidity and water-stopping, which can be smoothly discharged by the screw conveyor, and can also resist the earth pressure and groundwater pressure before excavation, so as to keep the soil in front of the cutter head stable.

If the cutter head driving power is increased and the cutter head body is replaced, it can also be used for mudstone, strongly weathered sandstone and moderately weathered sandstone, and can also be used for various strata such as water-bearing sand layers and gravel layers with pebbles that are easy to collapse. This pipe jacking machine is very adaptable to soil layers.

2.4 Technical parameters of pipe jacking machine

Table 1 lists the technical parameters of EPB pipe jacking machine driven by Japanese broadsword motor, and Table 2 lists the main technical parameters of several typical EPB pipe jacking machines driven by Japanese broadsword motor.

3 application of pipe jacking machine

3. 1 Shantou Water Transfer Project, Guangdong Province

In the water conveyance project of Shantou City, Guangdong Province, a water conveyance steel pipe with a length of 58m and an outer diameter of 1400mm passes through the main road of Shantou City (Jinsha East Road). EPB pipe jacking machine is driven by semi-remote φ 1400mm broadsword motor (Figure 1).

The jacking stratum of the pipeline is sandy soil (mainly medium sand, but also some shells with the diameter of 10 ~ 14 mm). The groundwater level is below 0.5m on the surface, and the soil at the top of the pipeline is 3.3m thick, so there are complex underground pipelines to be protected. 58m jacking 13 days is completed, and the ground subsidence is 0 ~ 10 mm. ..

3.2 Xi Arrange water pipe jacking project

Xi 'an has a main rainwater interception pipe, in which the length of section B pipeline is 5 12m, passing through residential buildings and urban traffic arteries along the way. The designed longitudinal slope is 7/ 10000, with an average buried depth of 9m. Rainwater pipes are made of reinforced concrete pipes with the specification of φ3000mm, and the pipe joint is 2.5m long. Φ φ3000mm broadsword motor is used to drive earth pressure balance pipe jacking machine, and two relay rooms are set up. Because the jacking soil layer is collapsible clay, there are oxidation spots and shell fragments in the soil, sand is sandwiched between layers, which is collapsible, hard plastic ~ plastic, and the cohesion of the soil is as high as 45 ~ 45~55kPa. Therefore, in addition to the water injection port in front of the cutter head and the screw machine, there are also eight water injection holes on the partition of the soil bin of the pipe jacking machine, and the water injection quantity is strictly controlled according to the current value of the cutter head driving motor during construction. During the construction period, there are no cracks in the house and the ground traffic is normal. After the construction, the elevation and left-right deviation of the whole construction section meet the design requirements, and the ground settlement along the line is less than 5 mm

3.3 Shanghai Sewage Treatment Project

Φ1650 mm (Figure 2), 93438+0800 mm, Φ φ3000mm (Figure 3) and Φ φ2000mm driven by broadsword motor were successively applied in the pipe jacking construction of Shanghai sewage treatment project. The earth pressure balance construction technology of constant speed excavation and variable speed jacking was adopted to safely cross simple houses, railways and busy traffic.

3.4 Liwan Lake Power Tunnel Project in Guangzhou

The φ3000mm power tunnel project of Liwan Lake in Guangzhou is more than 400 meters long. The earth pressure balance pipe jacking machine with an outer diameter of 3600mm is adopted for pipe jacking construction (Figure 4). The pipeline is covered by 4 ~ 6 m soil, which is in fine sand layer and the groundwater level is high. The pipe jacking construction lasted about two months from the beginning of February 2002 to the end of 10 in 2003, and it passed through Huangsha Avenue, underground pipeline, Liwan Lake and the foundation (concrete cast-in-place pile) of 1 building safely.

3.5 Application in other projects

The EPB pipe jacking machine driven by broadsword motor is also applied to the construction of municipal underground pipelines in Beijing, Tianjin, Zhejiang, Jiangsu, Anhui, Hubei, Henan, Guangdong and Gansu. For example, in the sewage interception main pipe project in Dongguan City, Guangdong Province, the EPB pipe jacking machine driven by φ2000mm broadsword motor is 87 1m and φ2400m driven EPB pipe jacking machine; M broadsword motor is 400m in Tianjin, the earth pressure balance pipe jacking machine driven by φ 1800mm broadsword motor is used in the pipe jacking project of the west cross dike, and the earth pressure balance pipe jacking machine driven by φ2000mm broadsword motor is used in the pipe jacking project of Yuejin Road, and the excavation is 350 m; Φ1600 mm broadsword EPB pipe jacking machine is adopted in the sewage pipe network project of Zhi Zhi Road in Bengbu, Anhui Province, with a jacking length of 740 m; Earth pressure balance pipe jacking machine driven by φ 1650mm large cutterhead motor is adopted in the Yellow River crossing project of a natural gas pipeline in a city of Gansu, with jacking length of about 150m and buried depth of about 20m at the bottom of the pipeline, and the crossing stratum is argillaceous sandstone and mudstone. Zhengzhou Municipal Company adopts two φ2600mm large bladed motors to drive EPB pipe jacking construction, and the cumulative jacking length of each pipe jacking machine is about 3km.

4 conclusion

Earth pressure balance pipe jacking machine driven by broadsword motor has been widely used in China. In order to give full play to the advantages of EPB pipe jacking machine, such as simple operation, convenient construction and strong soil adaptability, when it is used in sandy soil, sandy gravel soil or strongly weathered sandstone stratum, the dynamic parameters of pipe jacking machine, the service life of main shaft seal and the wear resistance of structural parts (including tools) in contact with sandy soil should be improved, and the normal operation of lubrication system should be ensured. At the same time, strengthen the construction management, attach importance to and improve the construction technology, and add additives with different proportions and concentrations in the front end of the cutter head and the soil bin according to different soil qualities; Using pipeline pumping equipment and technology to transport soil can further improve the efficiency of pipe jacking construction.

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