求翻译：②当砼达到设计及规范要求的张拉强度后按设计规定先后次序、分批、对称进行张拉，严格按照张拉程序进行。张拉后按规范要求对管道进行压浆。是什么意思？

② When the concrete to meet the design and specifications of the tension strength according to design requirements after the order, in batches, symmetrical to tension, tension in strict accordance with the procedures. Tension according to specifications of the pipeline after grouting.

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②After tong achieved the design and standard request pulls the intensity according to the design stipulation order, in turn, symmetrically carries on successively opens pulls, according to opens strictly pulls the procedure to carry on.Opens the pull back to carry on the mud jacking according to the

② When the tensile strength of concrete design and specification back order as required by design, in batches, symmetric stretching, in strict accordance with tensioning procedure. After tension according to the specification requirements for pipe-jacking.

② When the concrete to meet the design and specifications of the tension strength according to design requirements after the order, in batches, symmetrical to tension, tension in strict accordance with the procedures. Tension according to specifications of the pipeline after grouting.