Combined with the practice of pretensioning prestressed voided slab,the paper discussed the construction repair,pouring and curing etc.

Combining the actual situation of site, guided by the principle of economy, the article introduces the design and manufacture of production line of long line pretensioning prestressed concrete crane girder, the manufacture and installation of template, the stretch and release of prestressing bar, the concrete depositing and the steam curing in detail.

Construction of prestressed precast beam with pretension;

The text briefly introduces structure design of pretension girder strethching pedestal,design and calculation of main component.

Combined with the construction practice,the paper introduced the design idea of concrete bar dowel for pretensioned grooved stretching bed etc.

Process and technology control of making the pre-tensioned prestressed hollow slab;

In this thesis, the construction technique, safety and quality control method of manufacture are researched for the spot-manufacturing simple-supported T beam with pre-tensioned prestressed durability concrete, under the conditions of serious cold, low pressure, a lack of oxygen, strong radiation and special weather on the Qingzang Plateau.