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Rail transit large-tonnage pre-tensioning method prestressed concrete U type beam and tensioned bed thereof

A technology for rail transit and tensioning pedestals, applied in bridges, bridge materials, bridge construction, etc., can solve problems such as complex construction procedures, overturning risks, and difficulties in the design and manufacture of tension pedestal structures, so as to improve overall stability and stress The effect of clear and simple structure

Active Publication Date: 2017-02-22
CHINA RAILWAY 23RD BUREAU GRP RAILTRANSIT ENG CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for large-tonnage tensioning pedestals such as beams and slabs, conventional pile foundations are usually used to support gravity-type tensioning pedestals. The disadvantage of this kind of pedestal is that the construction process is complicated and there is a danger of overturning
And due to reasons such as the prestressed tension application method, the structural design and manufacture of the tension pedestal with large positions are particularly difficult

Method used

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  • Rail transit large-tonnage pre-tensioning method prestressed concrete U type beam and tensioned bed thereof
  • Rail transit large-tonnage pre-tensioning method prestressed concrete U type beam and tensioned bed thereof
  • Rail transit large-tonnage pre-tensioning method prestressed concrete U type beam and tensioned bed thereof

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Embodiment Construction

[0024] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the large tonnage pre-tensioned prestressed concrete U-shaped beam 1 includes: a bottom plate 101 and a web 102, and the web 102 is arranged on both sides of the bottom plate. There are multiple prestressed steel strands 103 inside the bottom plate 101 . In this embodiment, the bottom plate 101 has a width of 4528mm and a thickness of 400mm, the average thickness of the web 102 is 280mm, and the beam height is 2m.

[0026] The large-tonnage pre-tensioned prestressed concrete U-shaped beam of this embodiment has two kinds of spans, which are 30m and 35m respectively.

[0027] Among them, there are 103 prestressed steel strands for the 30m U-shaped beam floor and 106 strands, with a single tensile force of 17.19 tons and a total tensile tonnage of more than 1,800 tons; the number of prestressed steel strands for the 35m...

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Abstract

The invention provides a rail transit large-tonnage pre-tensioning method prestressed concrete U type beam and a tensioned bed thereof. The tensioned bed comprises a bottom plate, a strip foundation arranged on the bottom plate and used for supporting the rail transit large-tonnage pre-tensioning method prestressed concrete U type beam, force transmission beams arranged on the two sides of the bottom plate, movable end steel cross beams arranged at one ends of the force transmission beams, fixed end steel cross beams arranged at the other ends of the force transmission beams and a jack arranged between the movable end steel cross beams and the force transmission beams. The tensioned bed has the beneficial effects of being simple in structure, clear in stress, being free of piling, high in construction speed, capable of greatly saving the construction materials and the like.

Description

technical field [0001] The invention relates to a U-shaped beam and its tensioning platform, in particular to a pre-tensioned prestressed concrete U-shaped beam and its tensioning platform. Background technique [0002] U-shaped beam is a kind of under-loaded force-bearing beam. Compared with box-shaped beam and T-shaped beam, it has the advantages of beautiful appearance, low building height, high section utilization rate, and saving building materials. It began to be used abroad in the 1950s, mainly used in road and railway projects, and then used in subway rail transit projects. The domestic application was relatively late, and it was only used in highway engineering in a small amount in the 1970s and 1980s. It was not until the beginning of this century that it began to conduct experimental research in subway rail transit engineering. In 1999, the earliest test of a beam was carried out in Guangzhou Metro. In recent years, with the rapid development of my country's urba...

Claims

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Application Information

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IPC IPC(8): B28B23/04E01D2/00E01D101/28
CPCB28B23/04B28B23/043E01D2/00E01D2101/28
Inventor 徐闯黄静张长春李良才林晓波张召
Owner CHINA RAILWAY 23RD BUREAU GRP RAILTRANSIT ENG CO LTD
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