What Are The Key Concerns During The Construction Of Prestressed Anchorage
Release time:
2021-06-04
Prestressed anchorage is a kind of anchorage. This kind of equipment is suitable for all kinds of engineering construction processes.
Prestressed anchorage is a kind of anchorage. This kind of equipment is suitable for all kinds of engineering construction processes. It is used for concrete prestressing and tensioning, and it is often used in bridge construction. It is pre-installed and positioned during use, and then concrete is poured and buried at both ends of the concrete. In the construction of prestressed anchors, the following issues should be paid attention to.
The pre-stressed tendons should be cut, preferably with a grinding wheel saw, and no arc cutting; when the steel strands are bundled, they should be straightened out one by one and tied into bundles without disorder. The squeeze anchor or embossed anchor at the fixed end of the steel strand shall be assembled with the bearing plate and spiral tendons in advance; the strength test report of the concrete shall be provided before the prestressed tendons are stretched. When the compressive strength of the concrete meets the design requirements and is not lower than 75% of the design strength level, the prestress can be applied; before the prestressed tendons are stretched, the bearing slab surface should be cleaned and the concrete behind the bearing slab should be checked quality. If there is a cavity in the concrete, it should be repaired with epoxy mortar before tensioning; when the anchor is installed, the anchor plate should be straight, the clamps should be tightened, and the position of the slices should be even: but the clamps should not be too heavy when tightening Knock it with a rabbit to break the clip; when the pre-stressed tendon is stretched, it should be loaded from zero to the starting point of measuring the elongation value to obtain the initial tensile force, and then loaded to the required tensile force in stages; the grouting of the tunnel is required to be dense, and the cement The pulp strength grade should not be lower than C40. The ducts before grouting should be moist and clean, and the grouting should be carried out slowly and evenly without interruption, and the exhaust should be smooth. If the pores are blocked, the grouting port must be replaced, but the grout obtained from the first injection must be discharged to avoid the presence of gas between the grout after two injections.
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