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Construction method of steel-concrete anchors for built-in concrete girder bridges to limit local cracking

A concrete beam, built-in technology, applied to bridge parts, bridges, bridge construction, etc., can solve problems such as bridge safety, applicability and durability limitations, excessive cracks, etc.

Active Publication Date: 2020-05-15
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of modern transportation infrastructure, more and more large-scale concrete municipal bridges and long-span expressway overpass bridges appear, and there are more and more local cracks in bridges. Too large cracks will lead to bridge safety, Applicability, durability limited

Method used

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  • Construction method of steel-concrete anchors for built-in concrete girder bridges to limit local cracking
  • Construction method of steel-concrete anchors for built-in concrete girder bridges to limit local cracking
  • Construction method of steel-concrete anchors for built-in concrete girder bridges to limit local cracking

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Embodiment

[0046] After the construction of 4 sections of a rigid frame bridge, it was found that a large number of cracks along the bellows were found on the web near the wave anchorage. The plate made at the anchorage part is designed and constructed by referring to the aforementioned anchor piece and its construction method using the present invention. The web prestress of No. 5-6 is 350kN, and the size of the steel anchor box is designed on the web, such as Figure 7 As shown, the steel box is 25cm thick, the upper bottom of the trapezoid is 70cm wide, the lower bottom is 130cm wide, the height is 140cm, the plate thickness is 16mm, the external shear nails are 4.6 grade φ22 studs, and the interior is filled with C60 fine-grained continuous graded concrete .

[0047] Calculation: ① Shear stud shear capacity: 2(n m ×V sud +sinθn c V sud )≥350kN;

[0048] ②Trapezoidal upper plate bearing capacity: A c f c ×s≥350kN.

[0049] The property grade of stud material is 4.6, take f=21...

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Abstract

The invention discloses a built-in concrete beam bridge steel concrete anchor for limiting local cracking, which is a trapezoidal box body composed of a steel bottom plate, a front steel plate and a rear steel plate, an upper steel side plate and a lower steel side plate. The trapezoidal box body is divided into three chambers by two steel webs, namely, an upper chamber, a middle chamber and a lower chamber; Prestressed reinforcement corrugated pipes are arranged in the middle room, and the ends of the corrugated pipes are connected with the prestressed reinforcement holes reserved on the steel bottom slab, and the fine-grained concrete fills the cavities of the three chambers. This component makes full use of the large rigidity and good tensile property of the steel concrete structure, and solves the phenomenon of local cracking of the structure caused by the stress concentration of the concrete slab and the excessive lateral component force of the prestressed anchorage zone. The invention is applicable to the engineering practice of concrete bridges with larger prestressed tendons such as municipal bridges and long-span expressway crossover bridges.

Description

technical field [0001] The invention belongs to the technical field of concrete partial crack repair and reinforcement of concrete bridges, and in particular relates to a built-in concrete beam bridge steel-concrete anchor piece for limiting local cracks and a construction method thereof. Background technique [0002] In concrete bridges, due to stress concentration in the prestressed anchorage area and excessive prestressed transverse force, local cracking of the bridge concrete will occur. With the development of modern transportation infrastructure, more and more large-scale concrete municipal bridges and long-span expressway flyover bridges appear, and there are more and more local cracks in bridges. Too large cracks will lead to bridge safety, Applicability, durability is limited. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a built-in steel-concrete anchor for concrete girder bridge and its construction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/14E01D21/00
CPCE01D19/14E01D21/00
Inventor 郝天之陈齐风陈秋燕罗吉智杨涛于孟生王莹
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD