Application Research On The Reciprocating-Cross-Winding FRMP For Pipe Jacking

In our country urbanization advancement gradually has sped up since the reform and opening, so kinds of pipelines such as water supply and draining water, the electric power, the communication etc. have been laid down massively, and pipe jacking as one of the most important trenchless technology obtained big development, because it has slight destruction to the surface, smaller noise, affecting slightly to the environment, unimpeded transportation when constructing, even disturbing slightly to resident's activity, and it can reduce the relocation work along the route and save the fund and time, lower cost when passing through obstacles, railroads, roads, rivers, and building, thus pipe jacking is widespread applied, and this technology also advance much. The modern pipe jacking technology achieves a higher level through the long-term development, and the mechanical device and the machine capability also have great improvement.The new type of pipe, the glass fibre reinforced plastic mortar pipe (FRMP) of the reciprocating-cross-winding, overcomes the many defect in traditional tubing, such inoxidizability, adverse effect to water and so on. When FRMP is used in the pipe jacking, it have good hydraulics performance, long service life, high mechanical strength, good inoxidizability, slippery surface, smaller drag force, easy to rectify a deviation and other technical superiorities, especially is suitable for the pipe jacking construction in the municipal engineering .On the background of Shahechong Pipe jacking Project in Guangzhou, pipe jacking technique, especially the mechanical thrust has been analyzed and researched, and the theory and the practical application of the FRMP of the reciprocating-cross-winding for pipe jacking has been discussed; much emphases are paid to serviceability in the real engineering and the computation research of the thrust force during the construction process.Using the method of record on spot, the thrust correlation data to the construction process are recorded, the analysis have indicated that the jacking force have complex influence factors, basically assumed the linearity with the pipe distance; The synthesis friction coefficient jumps to a peak value from zero at the beginning section, then gradually drops until stabilizes to a lower level and keep to the end. Each measuring point altitude of the pipeline surface settlement changes correspondingly with the tool head distance changing, namely, no change without disturbance→little uplift with slight perturbation→rise to maximum...