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Comme écrit dans cet article, il a été décidé de poser mon champ solaire sur mon talus. Pour cela, il faut préparer le terrain et y « planter » 8 piquets. Plusieurs solutions s’offrent à moi, mais je me décide pour la solution des tuyaux en béton (20 cm de diam. intérieur) plantés dans mon talus, dans lesquels je mettrai des tubes en acier (40x40x3mm) puis dans lesquels je coulerai du béton.
C'est ce genre de tuyau qui a été utilisé : 1m de long et 20 cms de diamètre intérieur.
Voilà les diverses étapes aux travers desquelles j’ai eu à passer :
- Prendre les mesures du talus (dimensions, pente, …)
Là, comme j’avia pas d’appareil sophistiqué, je me suis équipé d’un niveau, d’un mètre, et je suis allé prendre des mesures sur le terrain… J’ai relevé une pente moyenne de 30° à l’endroit où j’avais décidé de poser le champ solaire.
- Effectuer les calculs pour déterminer les emplacements des 8 trous / piquets
Un travail pour lequel il faut être assez précis malgré tout, histoire de ne pas creuser au faux endroit…
- Creuser les 8 trous (min 30 cms de diamètre et 1m de profondeur)
Autant le dire de suite, c’est la partie la plus pénible de cette phase de travail. Là pas grand chose à expliquer, une pioche, une pelle, des mains, et y a plus qu’à… Chez moi, y avait pas mal de cailloux comme c’est un talus de remblais… c’était pas la joie à creuser, mais même avec mes mains de poulets j’y suis arrivé alors pas d’excuses… Notez que si votre terrain est moins en pente et moins caillouteux vous pouvez utiliser une tarière, une sorte de grosse perceuse à terre. - Placer les 8 tuyaux de béton
Là on rigole plus… Chaque tuyau fait 30 kgs, alors juste avec les mains une fois jeté dans le trou qu’on a creusé au point 3 ben c’est pas fastoche fastoche à bouger. L’idée est de positionner les tuyaux alignée entre eux, tant horizontalement que latéralement, et qu’ils soient à la même hauteur… Avec un talus qui n’est pas parfaitement régulier, j’ai charrogné un bon moment mais j’y suis arrivé ! Pour mon installation il fallait prévoir : 2.00m à l’axe de chaque tuyau (sur une même ligne), 1.01m entre chaque piquet (distance entre la ligne du haut et la ligne du bas et 71 cms de différence de hauteur entre la ligne du haut et celle du bas…
- Positionner les 8 tubes en acier
Là on commence à rigoler… mais pas pour longtemps ! Il faut maintenant essayer d’être le plus précis possible car ensuite on scellera ces tubes et ça sera fini d’ajuster quoi que ce soit ! Pour ce travail, l’outillage a été constitué d’un niveau d’angle (magnétique, très pratique!!) et d’une ficelle de maçon (pour aligner les piquets entre eux). Un travail de précision assez pénible à mener seul, mais en 2 heures on y est… Quelques cailloux pour caler les tubes en acier, le temps d’aller préparer le béton.
Une vue du talus avec les 8 tuyaux enterrée (1m) et les tubes partiellement scellés
- Couler le béton dans les 8 tuyaux
Là, pas grand chose à rajouter… quelques sacs de béton (5 pour ma part), une bétonnière, une truelle, un vieux bidon de peintre et le tour est joué. Ah aussi prévoir un peu de courage pour les nombreux allers-retours dans le talus chargé comme une mule…
Ici un détail d'un tube scellé et d'un autre dans lequel seul un petit fond de béton a été couler pour juste tenir le tube en place
- Régler la hauteur finale des tubes en acier
Là à l’aide des mesures de mon fichier Excel, d’un niveau, de ficelle de maçon et d’un rapporteur on marque la hauteur finale des tubes et on les coupe (à la meuleuse d’angle). - Installer les supports au haut des piliers
Une fois que tout est réglé correctement, on s’arrange pour monter un système qui permettra de fixer les carrelets de support. Là j’ai opté pour des pièces que Serbasol VS fabrique, et qui s’adaptent sur les tubes métalliques que j’ai scellé dans le béton. On comprend maintenant pourquoi j’ai choisi ces dimension de poutres métalliques 🙂 ! La photo du haut montre un pilier du bas, la suivante montre un pilier du haut :
Voilà, on a maintenant une toute belle pente avec 8 piquets prêts à recevoir un beau champ solaire ! Y a eu de la sueur, quelques cloques, mais on y est 🙂 !!