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Viticulture

With more than 30 years of experience in the wine industry, we have developed a range complete with posts and accessories functional and innovative.

Before making your choice, we invite you to read our recommendations.

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Our ADVICE

Profiled steel posts are manufactured mainly from two families of materialssteelThose beginning with the letters DX (DX51, DX52...) and those beginning with the letter S (S235, S250 …).

STEEL DX 51:

- DX = mild steel for cold forming.
- Elasticity from 15KgF/mm².

 

STEEL S 250 :

- S = standardised steels for construction (buildings, bridges, ships, etc.)
- Elasticity from 25KgF/mm2 (+40%)

 

The elastic resistance is the most important mechanical characteristic for the manufacture of posts.

 

For the same profile and weight, an S250 steel post will have at least 40% more theoretical yield strength than a DX51 steel post.

Our posts are made exclusively from S 250 and S 320 steel.

- Continuous hot-dip galvanising Z 275This product is suitable for soils with a PH of between 6.5 and 8.5 (estimated lifetime, 25 years + or - 5 years).

- Continuous hot-dip galvanising ZAM 300 or warm piece by piece, will be suitable for PH below 6.5 or above 8.5, or for long life in basic soils (over 30 years).

- Galvanisation is always done hot in a zinc bath à 450° about.

The posts are subjected to two main forces:
- The first, in the direction of the row, is due to the machines. Stakes narrow will facilitate the passage of machines and tools. In addition, they will reduce the "shadow zone" on either side of the posts, which will optimise the quality of the work.
- The second, lateral, due to the winds. From sides deep and dishes will better resist the winds.

The shape of the Multipic L30+ has the above characteristics.

It is wrong to assume that wide poles are stronger than light ones. In the direction of the rows, wide "U" shaped posts have different bending strengths depending on the direction of the forces.

They have an essential role. They will condition the ease and speed of readings and depalletising which are 2 operations that are repeated every year.

LINGUETS :
Opt for stakes with a specific shape that prevents them from being driven into the stakes by harvesting machines (anti-entrapment).
The advantage of this is that it allows for mechanical trellising and untensioning of the lifting wires.

The L30+ posts have a reinforced base and a flexible top to ensure that the wires are held in place by a clip. They are also suitable for hilly terrain.

THE NOTCHES :
Prefer
of notches said in " M "This is because the "H" shape is less effective in holding the threads.
U-shaped notches systematically require the use of staples to hold the lifting threads in place.
Z-notches should be avoided for lifting wires.
The "M, H and Z" notches are not very suitable for the mechanisation of lifting wires.

1° INSTALLATION OF THE INTERMEDIATE STAKES

PLANTING DEPTH :
Beyond the section of the post, it is the depth of planting in the ground that will give the best stability to the trellis. For profiled steel poles, the minimum depth should be 60 cm for poles less than 2 m. For posts of 2 m and over, apply the rule of 1/3 in the ground and 2/3 above ground. The rule is given for a spacing of 5 metres between posts.

Depths may vary depending on the nature of the soil:

- In very clayey soils, it is a good idea to increase them by at least 10 cm. Dry clay is very hard but when wet it is like "modelling clay". It deforms easily.
- In very stony soils, a 10 cm reduction can be made.
- Contrary to popular belief, sandy soils are the best texture for holding stakes. Indeed, sand is not compressible. Standard depths will do.
If these depths cannot be met, make a pre-hole, or reduce the distance between stakes.

PLANTING METHODS
It is important to have pressures or shocks in the axis of the posts.
- MANUAL PLANTING: Prefer a ramming ram.
- MECHANICAL PLANTING: prefer a hydraulic planter with percussion or friction rather than a mass system.
In difficult soils, (very dry soils, rock strata,...) use a water planter or a perforator (before the hole) to make it easier to drive in the stakes.
Planting with a sledgehammer (manual or mechanical), use a sledgehammer, available as an accessory to avoid damaging the heads.

2° INSTALLATION OF HEAD POSTS

DIRECTION OF PLANTING OF HEAD POSTS PROFILES

  • Position the open side towards the mooring line.

INCLINATION OF THE HEAD POSTS

  • The most suitable angle is around 20° or 40%.

HOW TO MEASURE AN ANGLE

  • Measure vertically 1m from the ground.
  • From this point measure 40 cm horizontally.
  • The angle obtained is close to 20°.

DISTANCE BETWEEN THE FOOT OF THE POLE AND THE MOORING LINE

  • The further away the line is from the foot of the head post, the more resistant it will be to being pulled out.
  • This distance D shall be at least 80% of H.
  • D = Distance between the mooring line and the foot of the head stake.
  • H = Height above ground of the posts.
  • D = 80% at MINIMUM of H

Notice explicative pour pose de piquet SA Julien.

ATTACHMENT POINTS OF THE MOORING WIRES ON THE HEAD POST

- The top wire at least 20 cm from the head of the post.
- The bottom wire halfway between the top wire and the ground.

ATTENTION to traditions and preconceived ideas...

ROW LENGTH :
The length of the rows has very little effect on the forces received by the mooring lines. The resultant of the forces at each post is equal to 0. There is no accumulation of loads along the length of the row.
The stresses on the ropes are mainly a function of the height above ground of the trellis and the distance between the stakes.
These same criteria should be taken into account when determining the strength of the posts.

GROUND HOLDING OF STAKES :

Hollow stakes (stakes with soil inside the stake, tube or profiled stakes without tips) will require more planting depth. This is because solid or hollow stakes appointed pushes the soil to the sides when sinking and thus creates an area of compacted soil around it, which increases holding power.

GAPS BETWEEN STAKES :
The most suitable distance is 5m. The greater the distance between the posts, the faster the trellis will age. This is because the posts and wires are subjected to more stress.
Beyond 5m it is strongly advised to plant the stakes 10 cm higher and to increase the strength of the stakes (thickness) and the wires.

SANDY SOILS :
In sandy soils, the stakes hold better than in clay soils. This is because sand is not compressible and is therefore more resistant to stress. Wet clay behaves like "modelling clay".

LEANING POSTS :
A leaning post shows that it has not been bent enough, it shows that it lacks strength (unless a machine has bent it).

OXIDATION OF THE EDGES :
On continuous hot-dip galvanised posts, any rust that appears on the edges will not migrate under the ZINC. In fact, the steel and zinc "fuse" in the first layer, thus preventing the rust from passing through. This oxidation will not alter the resistance of the posts over time.

RESISTANCE OF THE POLES :
To increase the strength of a wooden or concrete post, the cross-section must be increased. In the case of a profiled steel post, it is sufficient to increase the thickness of the metal.

GALVANISATION :
Continuous or piece-by-piece hot-dip galvanising is always carried out in a zinc bath at approximately 450°.

HOT GALVANIZING WITH A CONTINUOUS SHOT (Sendzimir process) :

Click on the image to enlarge

On continuous hot-dip galvanised posts, any rust that appears on the edges will not migrate under the ZINC. In fact, the steel and zinc "fuse" in the first layer, thus preventing the rust from passing through. This oxidation will not alter the resistance of the posts over time.

HOT-DIP GALVANIZING PIECE BY PIECE :

Click on the image to enlarge

STEEL :

More than 60% of the steel used in the world comes from recycling. Steel, like glass, does not lose its properties in recycling, unlike plastics. Do not confuse RECYCLED steel with DECLASSIFIED steel.

There are 2 steelmaking processes:

- The iron ore smelting industry 
- The scrap metal sector from the recovery of steel (recycling)

Click on the image to enlarge

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