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近年来,随着橡胶内模技术的发展,加快了小管径(60厘米以下)沟埋式低压素混凝土现浇管的施工进度。支渠以下的田间固定输水系统,采用这种埋管在节水、耕作方面具有明显的优越性。1974年以来河南许昌等地县,先后在灌区中修筑了数十条这样的无缝混凝土管,一般埋深0.8～1.2米,长度大多在百米以上,其中,内径20厘米,壁厚5厘米的一条长达500余米的无缝管最为典型,这条长管经多年运用,虽曾有个别地方出现过裂缝渗水,修补之后也就好了。迄今,这项技术除河南的一些地区外,天律、北京等地也陆续采用,混凝土管总长已达十万米以上。
In recent years, with the development of rubber mold technology, the construction progress of cast-in-place pipe for buried low-pressure concrete with small diameter (less than 60 cm) has been accelerated. The following fixed field water pipeline system, the use of such buried pipe in water-saving, tillage has obvious advantages. Since 1974 Xuchang and other counties in Henan Province, has built in the irrigation area dozens of such seamless concrete pipe, the general depth of 0.8 to 1.2 meters, mostly in the length of more than 100 meters, of which an inner diameter of 20 cm, wall thickness of 5 cm Of a more than 500 meters of seamless pipe is the most typical of this long tube after years of use, although there have been cracks in some places water seepage, just after the repair. So far, this technology in addition to some areas in Henan, the days of law, Beijing and other places have also been used, the total length of concrete pipe has reached 100,000 meters.