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Core-penetrating pull-type pedestal for pre-tensioned pre-stressing U-shaped beam and construction method thereof

A pre-stressing and pre-tensioning technique, applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problems of inconvenience for the second stroke tensioning of the top down, the stroke should not be too long, and the compression of the backing plate is large, and the construction efficiency is achieved. High, reduced process time, high stress control effect

Active Publication Date: 2012-11-21
CHINA RAILWAY 23RD BUREAU GRP RAILTRANSIT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the working stroke of the jack is relatively short, and it is not suitable for the production line with a large elongation value of the steel strand for long-line pedestal construction. unload the jack
The compression of the backing plate is relatively large, and the stress loss is obvious
It must be used in conjunction with a single-beam small jack; the stroke should not be too long, and the safety and stability are poor

Method used

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  • Core-penetrating pull-type pedestal for pre-tensioned pre-stressing U-shaped beam and construction method thereof
  • Core-penetrating pull-type pedestal for pre-tensioned pre-stressing U-shaped beam and construction method thereof
  • Core-penetrating pull-type pedestal for pre-tensioned pre-stressing U-shaped beam and construction method thereof

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Embodiment Construction

[0032] All features disclosed in this specification, or all disclosed steps in a method or process, may be combined in any way except mutually exclusive features and / or steps.

[0033] Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), unless expressly stated otherwise, may be replaced by other equivalent or alternative features serving a similar purpose. That is, unless expressly stated otherwise, each feature is but one example of a series of equivalent or similar features.

[0034] like figure 2 , image 3 , a pre-tensioning method prestressed U-shaped beam with a center-through traction pedestal, including a tensioning hydraulic device 1, a reaction force pier 2, an anchored steel beam 3, a beam body 5 and a reaction force platform foundation wall 6, the reaction The force abutments 2 are arranged at both ends of the reaction force abutment foundation wall 6, the reaction force abutments 2 are provided with reserved ...

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Abstract

The invention discloses a core-penetrating pull-type pedestal for a pre-tensioned pre-stressing U-shaped beam. A stretch-draw hydraulic device is arranged on the outside of a counter-force abutment, the position of an anchoring steel beam is fixed through a steel bar high-strength nut, simultaneously a sensor is installed on the anchoring steel beam and controlled by a controller. A method that signal tensioning, whole tensioning, secondary signal tensioning and charge holding stopping are sequentially carried out is used. The core-penetrating pull-type pedestal has the advantages that a lifting jack allows long operating stroke, the core-penetrating pull-type pedestal is applicable to construction of a long-line pedestal, in particular to a production line with big steel strand elongation value, and the core-penetrating pull-type pedestal brings convenience to repeated stroke tensioning of an inverse top. The core-penetrating pull-type pedestal is fixed on the counter-force abutment by tightly screwing the self-locking steel bar high-strength nut between the lifting jack and the counter-force abutment in a charge holding stage for fixing the position to unload the lifting jack. The core-penetrating pull-type pedestal is safe, high in efficiency and high in stress control accuracy, and effectively solves problems of low efficiency and high consumption of repeated tensioning due to the fact that a traditional process is used when a pre-stressed tendon elongation value is overlarge.

Description

technical field [0001] The invention relates to equipment and methods for prestressed construction, in particular to a through-center traction-type pedestal for pretensioned prestressed U-shaped beams and a construction method thereof. Background technique [0002] The long-line prestressed pretensioning construction is a production method in which two or more beams are simultaneously prestressed and pretensioned in series on a pretensioned production platform, and then concrete pouring, curing, demoulding and simultaneous tensioning are performed. . [0003] There are two ways to apply stress: push-pull and through-heart traction. [0004] Existing push-push schemes such as figure 1 Shown: Each pedestal is equipped with 8 sets of 600-ton pedestal jacks, with a tension stroke of 200mm; two sets of steel beams, and a certain number of supporting oil pumps. The steel beams used to anchor the steel strands are placed outside the load-bearing piers at both ends of the tension...

Claims

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Application Information

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IPC IPC(8): B28B23/04
Inventor 黄静张长春常琨李良才胡存坚杜魏林
Owner CHINA RAILWAY 23RD BUREAU GRP RAILTRANSIT ENG CO LTD
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