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Prestress rib tensioning equipment, system and method and concrete continuous box girder

A prestressed tendon and concrete technology, applied in the direction of erecting/assembling bridges, bridges, bridge materials, etc., can solve problems such as long time, and achieve the effect of simplifying construction steps, improving construction efficiency, and ensuring project quality

Active Publication Date: 2011-09-14
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above steps, it can be clearly seen that in order to ensure that the elongation of the prestressed tendons and the effective prestress can meet the design requirements after stretching, secondary stretching is also required, and the entire stretching process takes a long time

Method used

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  • Prestress rib tensioning equipment, system and method and concrete continuous box girder
  • Prestress rib tensioning equipment, system and method and concrete continuous box girder
  • Prestress rib tensioning equipment, system and method and concrete continuous box girder

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Embodiment Construction

[0072] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims of the present invention.

[0073] refer to Figure 1 to Figure 3 As shown in the figure, the tensioning equipment 110 of the concrete bridge of the present invention comprises a jack 10, a tensioning mechanism 20 and a locking mechanism 30, the jack 10 comprises a cylinder 11, a piston 12, an oil return port 13 and an oil inlet 14, and the piston 12 is set in the cylinder body 11. The locking mechanism 30 is arranged on the outside of the cylinder body 11 and is connected with the piston 12. The locking mechanism 30 includes a rotary handle 31, a support plate 32, a support sleeve 33, a rotary sleeve 34 and a rotary outer cover 35, wherein the support sleeve 33 ...

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Abstract

The invention relates to prestress rib tensioning equipment, system and method and a concrete continuous box girder. A prestress rib is tensioned by using the tensioning equipment comprising a jack, a tensioning mechanism and a locking mechanism; the tensioning mechanism comprises a tensioning rod and a pressure-bearing member; the tensioning rod penetrates through a cylinder body of the jack and a rotating sleeve of the locking mechanism; one end of the tensioning rod is provided with a connecting part for being connected with the prestress rib, and the connecting part is positioned in the rotating sleeve; and the pressure-bearing member is arranged at the other end of the tensioning rod and abutted against the cylinder body. The invention realizes tensioning and anchoring by connecting the tensioning rod with the prestress rib and combining the jack and the locking mechanism, can realize tensioning and anchoring by one-step tensioning process, is convenient for the prestress application, simplifies the construction procedure of a railway bridge culvert and ensures the engineering quality.

Description

technical field [0001] The invention relates to the field of civil engineering bridges, in particular to a prestressed tendon tensioning device, a tensioning system, a tensioning method and a concrete continuous box girder of a concrete bridge. Background technique [0002] At present, bridges account for a relatively large proportion of newly built railways and highways, among which there are a large number of prestressed concrete continuous beams, continuous rigid frames, continuous beam arches and other structures. When the vertical prestress of the prestressed concrete continuous girder bridge is insufficient and the arrangement of the prestress tendons is improper, the local stress will be too large, which will lead to oblique cracks in the web of the box girder. In order to improve the shear performance of long-span prestressed concrete structures and prevent oblique cracks, vertical prestressed tendons are usually placed on the box girder web and diaphragm during desi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00E01D2/04E04G21/12E01D101/28
Inventor 李学斌马林牛斌白金铸
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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