SIDRA drain (Patent no. PC2005A000015) has been designed with the purpose to install in the ground self-drilling draining steel pipes without the aid of casings that are commonly used to carry out drilling holes in loose grounds, in order to install the common PVC draining pipes.
During the years, SIDRA drain was subject to substantial evolutions and technical improvements until the one currently on the market that is mainly constituted of:
- High quality steel pipe characterised by the presence of draining holes of about 16 mm in diameter, protected by special “micro-filtering valves”.
- Metal and/or plastic micro-filtering valves.
- Protection of micro-filtering valves during the perforation phase, by filling them with a water soluble and biodegradable plastic material.
- Eventual sacrifical bit with non return valve (if installed with rotary technique).
- Eventual preventer, in case of drilling below the water table.
SIDRA drains can be supplied in elements of variable length, according to the specific needs of the job site.
The technical evolution of the product brought to consider the SIDRA draining pipe during the drilling phase, as a common drill rod because the “micro-filtering valves”, protected with water soluble plastic material, are effectively locked into the same pipe. This allows the drilling fluids to flow to the sacrificial bit (with pressures up to 15 Bar) without any need for a specific co-axial piping.
The use of SIDRA self-drilling drains is particularly useful for the following main reasons:
 The installation of SIDRA self-drilling steel drains is particularly easy, even in the most difficult work conditions. This can be carried out by using different perforation techniques: rotation technique with sacrifical drill-bit e non return valve, using draining pipes as a common drill rod; rotopercussion technique with top hammer and rotopercussion technique with down hole hammer (DHT). - Once installed in the ground, the maintenance of SIDRA drains is definitely facilitated by the presence of steel pipes because: A) the eventual additional inner PVC drain can be extracted after a certain number of year and substituted with another one without compromising the functionality or the drainage; B) the internal cleaning of the drain, through high-pressure washing with the use of suitable instruments, can take place without any clogging and without damaging the same drain, as it could instead easily occur if high pressure is applied to the traditional PVC drains.
- Moreover, the use of steel drains with Male/Female threaded joints also supplies greater resistance and durability in case of possible movements of the drained soils. In this case, SIDRA drains can also be used as structural elements. This is also valid, when SIDRA drains, in their so called SIDRA-GROUT application, are used in tunnelling as drain/forepoling.
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