Prestressed steel cylinder concrete push pipe

Abstract

The invention relates to a prestressed steel cylinder concrete push pipe. The prestressed steel cylinder concrete push pipe according to the technical scheme provided by the invention comprises a concrete pipe core and outer-ring reinforced concrete positioned outside the concrete pipe core and is characterized in that: the concrete pipe core is formed by pouring concrete in a cavity formed by cylindrical inner and outer steel mold plates, a bottom mold and a top mold; a cylinder steel cylinder is fixed in the cavity before pouring, a socket steel ring is arranged at the socket end of the concrete pipe core, and a jack steel ring is arranged at the jack end of the concrete pipe core, wherein the socket steel ring which corresponds to one end of the socket end is connected to the cylindrical steel cylinder, and the jack steel ring which is connected to one end of the jack end is connected to the cylinder steel cylinder. The prestressed steel cylinder concrete push pipe provided by the invention can bear larger pushing force during pushing construction, is provided with a grouting channel for grouting and drag reduction during construction, can bear larger internal water pressure and external load, strong anti-permeability of a pipe body, better leakproof property because two seal rings are used for sealing a joint, longer service life and lower construction cost compared with simular construction methods.

Description

technical field [0001] The invention relates to a concrete pressure pipe for water delivery, in particular to a prestressed steel tube concrete jacking pipe. Background technique [0002] Since the introduction of prestressed steel cylinder concrete pipes in China in the early 1990s, prestressed steel cylinder concrete pipes have gradually become the main pipe materials for domestic water transportation and diversion pipelines due to their unique and comprehensive advantages. In the case of high working pressure, it is the first choice for pipeline design. The pipeline has low cost, low maintenance cost, strong ability to resist external load and internal water pressure, and has a long design service life (up to 50 years). Except that it cannot be directly used for jacking construction It can adapt to various occasions outside the operation. Under the urban traffic conditions and geographical environment, including the need to cross the main road when laying pipelines in th...

AI Technical Summary

Problems solved by technology

[0003] At present, the pressure pipes that can be directly jacked mainly include welded steel pipes and non-prestressed steel cylinder concrete pipe jacking. The cost of welded steel pipes is relatively high, and the outer wall anti-corrosion layer is easy to be damaged, and because the steel pipes are directly jacked, it is easy to be affected by the alternating load of the road. Fatigue damage occurs, and the corrosion resistance of the inner wall is also poor. Every time a section of steel pipe is pushed in, welding work is required, the construction period is long, and the design service life of the steel pipe is generally 20 years.

Since the non-prestressed steel cylinder concrete pipe jacking type has no prestress, it can still be used when the working pressure in the pipe is low. When the working pressure reaches 0.6MPa and above, the amount of reinforcement is very high, and the project cost is expensive

Ordinary prestressed steel cylinder concrete pipes cannot be directly used for jacking operations because their outer walls are mortar protective layers, which are relatively rough and uneven in thickness, generally about 30 mm

At present, the trenchless pipeline design scheme commonly used in important projects is to jack ordinary reinforced concrete pipes first, and then pass steel pipes or prestressed steel cylinder concrete pipes inside the ordinary reinforced concrete jacking pipes, but the cost of this scheme is very high

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