Pipe jacking machine and pipe jacking machine blade

source：http://www.xrocktools.com/ Release Time：2015-09-11 14:59:41

1. Top pipe construction is a soil underground engineering construction method developed after shield tunneling, mainly used for the construction of underground water inlet pipes, drainage pipes, gas pipes, and telecommunication cable pipes. It does not require excavation of the surface layer and can cross highways, railways, rivers, ground buildings, underground structures, and various underground pipelines. It is a non excavation construction method for laying underground pipelines.

2. Basic principles of pipe jacking construction:

The method of burying a pipeline by simultaneously pushing it in, excavating the stratum, and extending the pipe section.

3. According to the diameter of the pipe being pushed in, there are four types: large diameter, medium diameter, small diameter, and micro top pipe. Large caliber pipes often refer to pipes with a diameter of over 2 meters, in which people can walk upright. The diameter of medium caliber top pipes is mostly 1.2-1.8m, and people need to bend down to walk in them. Most top pipes are medium caliber. The diameter of the small-diameter top pipe is 500-1000mm, and people can only crawl inside it, sometimes even crawling is quite difficult. The diameter of micro top pipes is usually below 400mm, with the smallest being only 75mm.

Divided by the length of one jacking (referring to the distance between the jacking work pit and the receiving work pit): ordinary distance jacking and long-distance jacking. There is currently no clear regulation on the division of the length of the jacking distance, which used to refer to pipes that were about 100m in length. At present, it is not uncommon to see pipe jacking over kilometers, and pipe jacking over 500m can be referred to as long-distance pipe jacking.

According to the type of pipe jacking machine, it can be divided into manual pipe jacking, extrusion pipe jacking, water jet pipe jacking, and mechanical pipe jacking (mud water type, mud water type, earth pressure type, rock type). The push pipe of the hand dug top pipe is only a steel pipe with a cutting edge (called a tool pipe) in front of it, and people dig soil inside the tool pipe. The soil breaking method for tunneling top pipes is similar to that of shield tunneling, and there are also mechanical and semi mechanical types.

Divided by pipe material: reinforced concrete top pipe, steel pipe top pipe, and top pipe of other pipes.

According to the curvature of the pipe trajectory, it can be divided into straight pipe jacking and curved pipe jacking.

4. Mud water balance pipe jacking machine

Mud water balance pipe jacking machine refers to a mud water type pipe jacking machine that uses mechanical cutting of soil, utilizes pressure to balance groundwater pressure and soil pressure, and uses hydraulic transportation of abandoned soil. It is a relatively advanced type of pipe jacking machine produced today.

There are two types of mud water balance pipe jacking machines according to the balancing object. One is that mud water only serves to balance groundwater, while soil pressure is balanced by mechanical means; Another approach is to balance both groundwater pressure and soil pressure simultaneously.

5. Earth pressure balanced pipe jacking machine

The earth pressure balance pipe jacking machine is transplanted from the earth pressure balance shield machine, and its balancing principle is the same as that of the shield machine. Compared with mud and water pipe jacking construction, the biggest feature is that the discharged soil or mud generally does not require secondary treatment, and has the characteristics of cutting the soil with a cutterhead, balancing the soil pressure on the excavation surface, minimal disturbance to the soil, and smaller settlement of the ground and buildings.

The soil pressure balance pipe jacking machine is divided into three types according to the type of soil filled in the soil silo: soil type, mud type, and mixed type; According to the form of the disc cutter, there are disc cutters with panels and disc cutters without panels; According to the presence or absence of mud addition function, there are ordinary and mud addition types; There are three types of mechanical transmission modes for the cutterhead: central transmission, intermediate transmission, and peripheral transmission; According to the number of disc cutters, there are single disc cutters and multi disc cutters.

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