Pipes

Crab system for profile pipes: characteristics and applications

September 5, 2020

Appropriate fasteners are required to connect the profile pipes, the number of species in the modern market is quite large. The finished design can be mobile or stationary. In the first case, the most effective are crab systems for profile pipes. Such fasteners have recently appeared on the market, but very quickly gained relevance and popularity.

Crab system is a modern type of fastening, used in oversized structures

Characteristics and application of crab system

Crab fasteners for profile pipes are widely used to create small metal frame structures. They allow you to work with square, and with rectangular products, and to transform or assemble any building from pipes according to own design. The crab mounting system is considered universal, strong, very easy to use and affordable.

No welding is required to install such elements, which requires specialized skills and specific equipment. Such a fastening for the profile pipe ensures a strong and reliable connection, which is practically no worse than welded.

Crab systems are used to create:

  • awnings, visors, canopies, transformers (summer cafes, exhibition pavilions, restaurants), gazebos, carports;
  • designs for beach showers, locker rooms, fences, terrace, racks, scaffolding, animal enclosures;
  • winter gardens, lawn fences, vineyards, shopping displays, greenhouses, modular partitions, etc..

The most common crab systems are found in greenhouse designs

When using crab systems there is no need to build a new structure, it is enough to dismantle the old unnecessary structure and move it to another place, or build another.

The main types of fasteners

Crab fasteners for profile pipes are available in the form of special clamps, which happen:

  • T-shaped;
  • L-shaped;
  • X-shaped.

Each fastening is capable to combine a certain number of profile products and has the places of installation. The T-shaped system is designed to connect three pipes, used in pipelines with a small diameter, to significantly simplify the entire installation. L-shaped fasteners securely connect the two pipes at the corners of the created structures. With the help of X-shaped mounting can be effectively fastened 4 elements, which are located in the middle of the created structure.

Exemplary characteristics of the products are given in the table.

Table 1

characteristic Unit Kind of crab system
T G X
The thickness of galvanized metal mm 1,2 1,2 1,2
Shelf mm 20 20 20
open mm 6,5 6,5 6,5
length mm 55 55 92
Width mm 92 55 92
weight of half G 45 30 70

The mount has a protective coating, which prevents corrosion

Fasteners are made of painted powder composition or galvanized metal thickness 1,5 millimeters.

pay attention! There are also uncoated and oxidized elements.

Structurally, the system is two halves, which are connected by nuts and bolts. The most popular is the size of products 95x65 or 95x95 mm.

Advantages of crabs for a profile pipe

Crab pipe system has a number of advantages, including:

  • possibility of repeated and safe for design installation / dismantling;
  • no need to call a welder or other specialist - the connection can be made independently;
  • no additional tools other than the adjustable wrench are required to dismantle the metal structure from the profile pipe;
  • wide scope;
  • load distribution throughout the frame;
  • low cost of the received designs;
  • providing additional strength and rigidity of the structure.

The following elements are required to connect the profile products:

  • wrenches of different diameters;
  • directly crab for pipes with all necessary details;
  • bolts and nuts with M-8 thread, if you plan to work with a large number of profile products.

The crab system allows you to get a reliable and strong connection, using only a wrench

Such a pipe fastening system also has good durability.

Some shortcomings of the elements

Of the disadvantages of crab mounts are distinguished:

  • possibility of joining of pipes only of the small sizes;
  • joining only at right angles;
  • risk of rupture;
  • the need for constant diagnosis;
  • the possibility of violating the geometry of the frame;
  • baseness (if the corresponding processing is not carried out).

In most cases, the fasteners are suitable for pipes with a cross section 20? 20, 20x30, 40? 40, 20x40 millimeters. Fixing of connecting rods occurs by a clamping method with tightening of bolts not on tightening, and on the system. For this reason, the design (example, greenhouses) becomes weak at the break. In some cases, the pipe can be easily removed from the mount without much effort.

pay attention! If the structure is outside the room, then it is constantly influenced by wind, snow or temperature loads. Eventually, the system may shake, therefore periodic tightening of fastenings is necessary. If you do not follow this moment, then the structure is able to skew and break accordingly.

Insufficient treatment of metal elements with anti-corrosion composition of the pipe inside the mount will rust quickly, as in crab fastening accumulation of condensate and precipitations is possible.

Crab pipe fastening system is considered to be one of the most acceptable and reliable elements for creating your own comfortable and mobile metal structures. No special skills are required to work with them.