Pipe jacking is an advanced technique for installing underground pipes, channels and pipes for electricity and telecommunications. At the same time as the special pipes are driven by very strong hydraulic jacks, the drilling operation is also done inside the shield and in front of the leading pipe. This method creates a flexible, resistant and watertight pipeline like a tunnel.
What is the Jacking Pip?
Pipe jacking is an advanced technique for installing underground pipes, channels and pipes for electricity, telecommunications and utilities. At the same time as the special pipes are driven by very strong hydraulic jacks, the drilling operation is also done inside the shield and in front of the leading pipe, which is completely controllable. This method creates a flexible, resistant and watertight pipeline like a tunnel. Pipe jacking pipes produced in different materials including concrete, clay, grp and steel can be jacked and the standard pipe diameters are generally from 150 mm meters up to 2400 mm or more are variable if necessary.
The length of the jack can be achieved, which is more than 1 km depending on the pipe diameter, ground conditions and drilling methods. In theory, there is no limit to the length of the runi pipe route by pipe jacking, however, scientific considerations, Engineering and economics may create some limitations in practice. With this method, it is possible to run several meter long routes, as a straight route or a curved route or a combination of the two.
Pipe Jacking Technique:
In order to install a pipeline using this method, the sending and receiving shafts are usually built first. The dimensions and the way of construction of the shaft changes based on the specific needs of each route, and economic issues are the key factors. Compared to manual drilling, mechanical drilling methods mainly require larger shafts, at the same time, environmental and traffic conditions are the most important factors in determining the dimensions of the transmission shaft, among which the use of devices with the ability to change the length of the main chassis, in order to push the pipe with lengths Various devices, such as the Venon device, are introduced as the final solution to respond to the special conditions of the work place in smaller shafts.
About Jacking Pipe
Plumbing, generally referred to as micro-dimming in smaller diameters, is a method of installing underground pipelines, ducts and rivers. Powerful hydraulic jacks are used to push specially designed pipes through the ground behind the bumper while drilling into the bumper. During the excavation of this tunnel, a flexible, structural, waterproof pipeline has been completed.
There is no theoretical limit to the pipe length of individual pipes, although practical engineering considerations and economics may impose limits. Drives of several hundred meters are easily achieved either in a straight line or a radius or a series of radii. A wide range of mechanical and remote control drilling systems are available. Pipes in the range of 150 to 3000 mm can be installed using the appropriate system. Construction tolerances are comparable to other tunneling methods, and the pipe joint method generally requires less overflow than alternative systems. This provides ground support and reduces potential ground movement. Mechanical excavation methods are similar to other tunneling methods. Shield, excavation and face support can be provided for a wide range of terrain conditions.
In order to install the pipeline using this method, thrust and gearbox holes are usually made in manhole positions. The dimensions and construction of the thrust pit are different depending on the specific needs of each drive. The size of the pits will vary according to the excavation methods used, although these can be reduced in certain circumstances.
A pivot wall is built to react against the jack. In a weak surface, it may be necessary to use columnar or other special arrangements to increase the axial wall response. Where there is insufficient depth to construct a normal shaft wall, for example through an embankment, resistance to connection must be provided using a structural framework of sufficient restraint through piles, ground anchors or other methods. other to resist horizontal load transfer.
To ensure the distribution of the jacking force around the jacked pipe, a thrust ring is used to transfer the load. The jacks are hydraulically interconnected to ensure that the pressure from each is the same. The number of jacks used may vary due to the size of the pipe, the strength of the jack pipes, the installed length and the anticipated frictional resistance.
A reception pit of sufficient size to eliminate the jack bumper is usually required at the full end of each drive. The initial level of the pipe jack is obtained by accurately placing the guide rails in the thrust pit on which the pipes are placed. To maintain the accuracy of alignment when moving the pipe, it is necessary to use a steerable shield, which must be regularly checked for line and level from a fixed reference. For short or simple pipe jacks, these surveys can be done using traditional surveying equipment. Rapid excavation and remote control techniques require advanced electronic guidance systems using a combination of laser and screen-based computer techniques.
When piping or microtunneling is done below the water table, a front and seal assembly is usually placed in each thrust and receiving pit. The use of these items prevents the entry of underground water and the destruction of the accompanying earth and preserves cyclic oils. The technique of connecting the pipe and its components has been subjected to extensive and continuous research in a number of prestigious universities in England, including Oxford and Cambridge. This includes full-scale model and testing of pipes and fittings and the effect of lubrication and soil conditioning on the pipe laying process.
