PVC paipu, a ɛyɛ plastic piping ade a wɔde di dwuma kɛse wɔ nnɛyi adansi ne mfiridwuma mu no abɛyɛ nea wɔpɛ wɔ mfuw ahorow mu, a nsu a wɔde ma ne nsu a wɔde gu mu, anyinam ahoɔden ho banbɔ, ne kuayɛ mu nsu a wɔde gugu nnɔbae so ka ho, esiane sɛ ɛyɛ adwuma yiye na ɛho ka sua nti. Bere a ɔkyerɛwfo no de mfe pii ahwɛ ne mfiridwuma mu nhwehwɛmu akyi no, wabɔ osuahu atitiriw pii a ɛfa PVC paipu a wɔpaw, nea wɔde si hɔ, ne ne siesie ho no mua, a wɔayɛ ho nhyehyɛe wɔ nhyehyɛe kwan so wɔ ase ha.
I. Nneɛma a ɛwɔ hɔ ne nea wɔpaw no mu nsɛntitiriw .
Wobetumi akyekyɛ PVC paipu, a ne tiawa yɛ polyvinyl chloride paipu no mu ayɛ no PVC a ɛyɛ den (UPVC) ne PVC a ɛyɛ mmerɛw a egyina plasticizer a ɛwɔ mu so. Wɔde UPVC di dwuma titiriw wɔ engineering adeyɛ mu esiane ne su a ɛda nsow a ɛne tensile ahoɔden a ɛboro anaasɛ ɛne 45 MPa ne tenten-bere a wɔde yɛ adwuma no hyew a ɛyɛ -15℃kosi 60℃. Wɔ paw nhyehyɛe no mu no, fa w’adwene si parameters a edidi so yi so: pipe diameter tolerances ɛsɛ sɛ ɛne GB/T 10002.1 hyia, a ɔfasu no mu duru a ɛkɔ fam wɔ ±10% mu. Wɔ pressure pipes ho no, ɛsɛ sɛ wɔdi hoop stiffness rating no ho adanseɛ (SN4/SN8/SN16 ne amusieeɛ mu bun ahwehwɛdeɛ ahodoɔ hyia). Ɛsɛ sɛ ahotew ho nhama ma nsu ho ahotew ho tumi krataa, na ɛnsɛ sɛ kɔbere a ɛwɔ mu no boro 0.001 mg/L.
Ɛfata sɛ yɛhyɛ no nsow sɛ nkitahodi a ɛne PVC paipu fittings a wɔn a wɔyɛ nneɛma ahorow no yɛ no hyia no gu ahorow. Wɔ municipal project biako mu no, brand A gluu ne brand B sockets a wɔde frafrae no maa 23% joint leakage bae. Wɔnam nneɛma a ɛne ne ho hyia a wɔde di dwuma a efi ahyɛnsode koro no ara mu a wɔde bedi dwuma no so siesiee eyi. Wɔhyɛ nyansa sɛ wɔn a wɔde nneɛma ma no mfa nneɛma ho adansedi krataa a edi mũ mma na wɔnyɛ nhwɛsode nhwehwɛmu bere a wɔretɔ nneɛma pii no.
II. Nneɛma titiriw a wɔde si dan ne nea wɔde si hɔ .
Ɛsɛ sɛ wɔde PVC saw a wɔahyira so anaa angle grinder twa nsu afiri. Ɛsɛ sɛ nea wɔatwitwa no yɛ mmerɛw na burr-wɔn ho nni asɛm. Inclination angle a ɛboro digrii 2 no betumi ama stress concentration wɔ joint no so. Ɔhyew-melt nkitahodi nhyehyɛe no hwehwɛ sɛ wɔhwɛ ɔhyew hyew (200-220℃) ne bere tenten (bɛyɛ 4- 5 seconds ma φ50 paipu). Ɔhyew a ɛboro so betumi ama nneɛma no aporɔw na ama hydrogen chloride mframa aba. Wɔ socket-and-spigot nkitahodi ho no, ɛsɛ sɛ insertion depth mark no ne socket end face no yɛ flush. Wɔ adansi ankasa mu no, bɛyɛ 15% a ɛba wɔ nsu a ɛtwetwe mu no fi nea wɔde hyɛ mu a ɛnnɔɔso.
Wɔ asase ase a wɔde besisi hɔ no, mmara hwehwɛ sɛ ɛnsɛ sɛ backfill particle size no boro 1/3 wɔ pipe diameter no mu, na ɛnsɛ sɛ nneɛma a ɛyɛ den te sɛ birikisi a abubu no wɔ 150mm a ɛyɛ den no mu. Wɔ rainwater pipe network adwuma a wɔte mu mu no, backfill compaction a ɛnnɔɔso no maa settlement rate a ɛnyɛ pɛpɛɛpɛ boroo 3%. Akyiri yi, wɔde kɔnkrit hyɛn gyinabea ahorow kaa ho de hyɛɛ mu den. Wɔ pipe supports a ɛda adi no ho no, ɛsɛ sɛ spacing no sua anaasɛ ɛne 1.2m yɛ pɛ wɔ horizontally na ɛsua anaasɛ ɛne 1.5m yɛ pɛ vertically ma DN25-DN50 pipes. Ɛsɛ sɛ wɔde anchor points foforo ma wɔ bends.
iii. Ɔhaw a ɛtaa ba a wohu ne sɛnea wosiesie .
PVC paipu a ɛtaa di nkogu no bi ne nkwaa a ɛtwetwe, paipu fasu mu a ɛpaapae, ne dede a ɛma nsu no sen. Wobetumi de PVC patching adhesive akata nsu a ɛretu wɔ nkwaa mu no so bere tiaa bi, nanso nneɛma a wosiesie daa no da so ara hwehwɛ sɛ wɔde saw na ɛsan ka ho bio. Mpɛn pii no, sɛnea paipu mu paapae no ba wɔ awɔw bere mu hyew mu. Sɛ ambient temperatures so tew ba fam 5℃, ɛsɛ sɛ wɔde insulation measures di dwuma anaasɛ awɔw-sistant PVC pipe (brittle temperature less or equal -20℃) ɛsɛ sɛ wɔde di dwuma. Wobetumi adi nsu a ɛsen no dede ho dwuma denam nneɛma a wɔde bɛka ho a wɔde bɛka ho (te sɛ rɔba gaskets) anaasɛ wɔbɛsesa nsu a ɛsen no so (wɔkamfo kyerɛ na ama wɔahwɛ so yiye 0.8-1.5 m/s).
Ɛsɛ sɛ nhwehwɛmu a wɔyɛ no daa no bi ne: nhwehwɛmu a wɔde aniwa hu a ɛfa paipu no ani a ɛwɔ mpaapaemu ne deformation ho; detector a ɛma nsu tɔ a wɔde di dwuma de hu nsu a ɛtwetwe a ahintaw; na wɔasɔ anti-corrosion coating no mudi mu kura ahwɛ wɔ nsuo afiri a wɔasie no so mfeɛ mmiɛnsa biara. Nsɛm a wɔayɛ ho nhwehwɛmu wɔ mfiridwuma atenaeɛ bi kyerɛɛ sɛ, sɛ wɔde digyital nsuo afiri sohwɛ nhyehyɛeɛ di dwuma a, ɛma mmuaeɛ berɛ so tew wɔ PVC nsuo afiri a ɛdi huammɔ no mu 60% na ɛtew ɛka a wɔbɔ wɔ nsiesie ho no so 42%.
iv. Nkɔsoɔ a ɛrekɔ so ne dwumadie foforɔ .
PVC nsuo afiri foforɔ a wɔasesa no rekɔ so atrɛ wɔn dwumadie hyeɛ mu: PVC{0}}M nsuo afiri a ɛwɔ nsunsuansoɔ a ɛsesa no ahunu sɛ wɔn nsunsuansoɔ a ɛko tia no akɔ soro 300%; PVC-O nsuo afiri a wɔde biaxial orientation kwan di dwuma no ama wɔn hoop ahoɔden akɔ soro bɛboro mpɛn anum; Na nanocomposites a wɔde aba no ama PVC pipes a ɛko tia mmoawa no atumi anya 99% antibacterial rate. Wɔ smart city construction mu no, intelligent PVC pipe network systems a ɛwɔ pressure sensor ahorow a wɔaka abom no anya beae pɔtee a ɛretu a mfomso nnu mita 0.5.
Sɛ yɛhwɛ mfiridwuma sikasɛm mu a, bere a sika a wɔde hyɛ PVC nhama mu mfiase no bɛyɛ 35% sen dade nhama a wɔde gu mu no, wɔn 50-afe nkwa nna nyinaa ka yɛ nea mfaso wɔ so kɛse. Bere a me man "plastics replacing steel" nhyehyɛe no kɔ so kɔ anim no, PVC pipe application technology nhyehyɛe a wɔahyɛ da ayɛ no bɛyɛ mmoa titiriw ama nkɔso a ɛkorɔn a ɛbɛba wɔ nnwuma a wɔyɛ no mu.
