Construction method of underground pump station high-rotating-speed unit anti-vibration structure

Abstract

The invention discloses a construction method of an underground pump station high-rotating-speed unit anti-vibration structure. The construction method comprises the following steps that S1, when an underground pump station plant is excavated, anti-vibration grooves are excavated in the positions, extending to a motor floor slab from the top of a water inlet pipe / water outlet pipe, of the rock walls on the outer sides of the upstream side wall and the downstream side wall of the underground pump station plant; S2, concrete is sprayed on the surfaces of the anti-vibration grooves, system anchor rods are installed in the anti-vibration grooves, one ends of the system anchor rods are anchored into the rock walls of the plant, and the other ends of the system anchor rods are bent to be bound or welded to side wall steel bars; and S3, concrete is poured into the anti-vibration grooves and the upstream and downstream side walls of the plant at the same time, and the surrounding rock and the underground pump station plant structure are combined into a whole. By the adoption of the method, the integrity of the surrounding rock and the plant structure can be effectively improved, the natural vibration frequency of the plant structure is increased, the staggered opening degree of the natural vibration frequency and the rotating frequency of a high-rotating-speed unit is increased, and therefore a resonance area is avoided, and the anti-vibration safety of the underground pump station plant structure is guaranteed.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to a construction method for an anti-vibration structure of a high-speed unit of an underground pumping station. Background technique [0002] The powerhouse structure of the underground pumping station is the main structure bearing the dynamic load of the unit, and the structure is complex. When the plant structure natural frequency f 自 and unit rotation frequency f 转 Insufficient stagger (|(f 自 -f 转 ) / f 自 |≤20%), resonance may occur. [0003] For high-speed water pump units, the rotation frequency of the unit and the natural vibration frequency of the plant structure are often insufficiently staggered. In order to withstand the vibration load of the unit, the structural system of the plant must have sufficient overall anti-vibration stiffness. Generally speaking, instead of weakening the plant structure to avoid the resonance area, certain engineering measur...

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Problems solved by technology

The additional anchor is directly anchored into the concrete structure of the floor slab, that is, the surrounding rock of the plant and the concrete of the side wall are combined through the additional anchor to improve the integrity of the surrounding rock of the plant and the concrete structure, but the degree of combination cannot be quantitatively calculated

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