Adjustable center returning base of center penetrating jack

Abstract

The invention discloses an adjustable center returning base of a center penetrating jack. The base comprises adjustable legs, a bracket baseplate, a stiffened plate and a ground foot cushion plate, wherein the adjustable legs are connected through the bracket baseplate; the lower ends of the adjustable legs are mounted on the ground foot cushion plate; four adjustable legs are provided; each adjustable leg comprises an adjustable screw rod; screw rod casings are mounted outside the adjustable screw rods; and multiple square nuts are connected with the screw rod casings. The base has the advantages of simple structure, convenience for operation, safety and reliability; and the jack eccentricity problem can be solved only by manually adjusting the adjustable screw rods through a spanner, so that the problems of capability of performing the jack eccentricity adjustment through the fit of multiple persons, prevention of repeated adjustment, long adjustment time and inaccurate centering precision are solved.

Description

technical field [0001] The invention belongs to the technical field of finishing-rolled rebar tensioning for vertical prestressing of box girder bridges in road and bridge construction, and in particular relates to an adjustable centering base of a through-center jack. Background technique [0002] In the field of road and bridge engineering construction technology, during the tensioning process of the vertically prestressed finish-rolled rebar for box girder bridges, the strength of the concrete should not be lower than the design strength requirements during tension, but in the actual construction process, the strength requirements are often not met , resulting in eccentricity in the process of tensioning and prestressing finish-rolled rebar. At present, the common way to correct the deviation is to artificially add a steel plate under the nut backing plate, or add a backing plate under the leg of the jack base to solve the eccentricity problem. These leveling methods are ...

AI Technical Summary

Problems solved by technology

[0002] In the field of road and bridge engineering construction technology, during the tensioning process of the vertically prestressed finish-rolled rebar for box girder bridges, the strength of the concrete should not be lower than the design strength requirements during tension, but in the actual construction process, the strength requirements are often not met , resulting in eccentricity in the process of tensioning and prestressing finish-rolled rebar. At present, the common way to correct the deviation is to artificially add a steel plate under the nut backing plate, or add a backing plate under the leg of the jack base to solve the eccentricity problem. These leveling methods are unreliable and safe, time-consuming and labor-intensive

Images