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A construction method for deflection control of long-span supports

A construction method and large-span technology, applied in erecting/assembling bridges, bridges, buildings, etc., can solve problems such as no good solutions, and achieve the effect of easier control of construction quality

Active Publication Date: 2017-09-08
SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For structures larger than 18M and above, and even need to span about 30M, there is no good solution except for setting temporary pile piers to reduce the span

Method used

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  • A construction method for deflection control of long-span supports
  • A construction method for deflection control of long-span supports

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Experimental program
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Embodiment

[0014] Embodiment: When the Bailey beam support is used as a large-span concrete support in bridge construction, it is often limited by its deflection and cannot be used in a slightly larger span. Therefore, this embodiment will specifically disclose a large-span support The construction method of deflection control is suitable for concrete box girders with single box and multiple chambers and multiple boxes and multiple chambers. This deflection control method divides the pouring of concrete beams into three sections reasonably by improving the traditional idea of ​​pouring concrete beams as a whole. two side-span beam sections and one mid-span beam section) are implemented, and then temporary external beam body prestress is applied to the side-span concrete beam body implemented earlier to reduce the load effect on the mid-span, and two side-span concrete beams are used The beam itself bears the deflection of the mid-span support platform, so as to maximize the mechanical pro...

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Abstract

The invention discloses a large-span support deflection control construction method.The method includes following steps: according to construction design requirements, constructing a foundation pile, and setting up a support platform on the foundation pile; pouring a concrete beam on the support platform in a three-section manner: pouring a two-side-span concrete beam, and tensioning temporary outer beam prestress of the two-side-span concrete beam, namely tensioning two ends of each temporary prestressed bundle in the two-side-span concrete beam according to tension force of 15-18T; pouring a middle-span concrete beam, and tensioning prestress of the whole concrete beam; removing the temporary outer beam prestress applied on the two-side-span concrete beam.The method has the advantages that compared with conventional support construction processes, the problem that large-span construction cannot be implemented due to deflection index of a support structure can be solved; compared with one-time integral pouring, quantity of concrete for sectional pouring of the beam is reduced, so that construction quality of concrete is easier to control.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a construction method for controlling the deflection of a large-span support. Background technique [0002] For pouring concrete beams on supports, it is a method commonly used in bridge construction. On land, it has the characteristics of clear force, convenience, simplicity, and easy access to materials. However, for crossing rivers and being restricted by water navigation and building height restrictions, it is necessary to find a method that can have a relatively large span, that is, the deflection control must be less than L / 400. Among them, the simple scaffold formed by Bailey sheet is one of the preferred methods. [0003] However, the applicable span range of commonly used single-layer Bailey sheets is generally less than 18M. For structures that are larger than 18M and above, or even need to span about 30M, there is no good solution except for s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00
CPCE01D21/00
Inventor 叶智勇陈立生赵国强徐伟忠郑杰戴慧丽
Owner SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD
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