Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method

A concrete box girder and construction method technology, applied in the direction of manufacturing tools, ceramic molding machines, ceramic molding workshops, etc., can solve the problems of lack of mature technology, high technical requirements, and difficult engineering, and achieve good outline size and strong operability , Lifting and easy installation

Active Publication Date: 2009-12-23
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The 32m / 900t class post-tensioned prestressed concrete box girder adopted by the Hening Railway is a single box section structure with a beam length of 32.6m, a span of 31.5m, a beam width of 13.0m, a beam end height of 3m, and a mid-span beam height of 2.8m. Up to 830 tons; it has the characteristics of large volume, self-heavy weight, and large width-to-span ratio. Its prefabricated construction is the first in China. A new technical scheme suitable for the prefabricated construction of box girders in this road section

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method
  • Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] The technological process of the post-tensioned prestressed concrete box girder whole hole prefabrication construction method in this embodiment is as follows figure 1 As shown, its main steps include:

[0048] (1) Install templates, steel bars and embedded parts, etc.:

[0049] The steps mainly include: repairing the bottom mold, adjusting the side mold, installing the support plate and the anti-drop beam plate, installing the drawing hose, hoisting the main steel bar, installing the embedded parts of the beam body, hoisting the inner mold, installing the end mold, Hoisting surface reinforcement, bridge deck embedded parts installation, etc.

[0050] In this step:

[0051] Both the main reinforcement and the bridge deck reinforcement adopt centralized pre-tie-up and overall hoisting technology, that is, the processing of the box girder reinforcement (including the main reinforcement and bridge deck reinforcement) is completed in the reinforcement workshop, and then b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a post-tensioned prestressed concrete box girder whole-hole prefabrication construction method. The main steps include: installing formwork, steel bars and pre-embedded parts, concrete pouring of the beam body, steam curing or natural curing of the beam body concrete, and removal of the formwork , tensioning, post-sequence construction, etc. Among them, the reinforcement adopts centralized pre-tightening and integral hoisting technology, the tensioning step adopts three tensioning processes of pre-tensioning, initial tensioning and final tensioning, the internal mold adopts hydraulic internal mold system, and the beam The solid concrete pouring step adopts the construction scheme of centralized concrete mixing and pipeline pumping pouring, which is continuously moved in layers, and poured step by step from the two ends to the middle, forming at one time. The construction method of the present invention is applicable to the whole hole prefabrication construction of prestressed concrete box girders with 32m / 900t class large span and large tonnage in railway passenger dedicated lines.

Description

technical field [0001] The invention relates to a construction method of a prestressed concrete structure of a bridge engineering, and belongs to the technical field of girder bridge prefabrication. Background technique [0002] Prestressed concrete structure is developed from ordinary reinforced concrete structure. It is the abbreviation of prestressed reinforced concrete. The scope of use of reinforced concrete and other aspects have shown good results. It has been widely used in industrial and civil buildings, bridges, sleepers, pressure pipes, poles, piles, liquid storage and gas storage tanks, etc. [0003] The box girders of Qinshen Passenger Dedicated Line that have been built in China are 20m and 24m, with a maximum weight of 570 tons. The construction methods of box girder prefabrication include formwork engineering, reinforcement engineering, concrete engineering, prestressing engineering, etc. Due to the small span and beam weight of the box girder, the technic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B28B7/22B28B15/00B28B23/04B28B11/00
Inventor 韩伟邹宏伟王强孙祖红周文武钟士全申超袁东周玉兴钟卫翔
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap