Construction method for chamber type bridge maintaining external pre-stress

A technology of external prestressing and construction method, applied in bridge maintenance, bridge, bridge reinforcement and other directions, can solve the problem of not being able to use newly poured concrete for anchoring, etc., and achieve the effect of simple construction and strong reliability

Inactive Publication Date: 2008-05-07
CHINA FIRST METALLURGICAL GROUP
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  • Abstract
  • Description
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Problems solved by technology

The existing external cables are directly anchored to the transverse partition wall, or anchored by newly poured concrete; when the transverse partition wall is too thin to fully bear the force of the external cable, or when there is no anchoring space behind the transverse partition wall, it is necessary to separately design the anchor block to bear the force; When the concrete transportation is

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  • Construction method for chamber type bridge maintaining external pre-stress
  • Construction method for chamber type bridge maintaining external pre-stress

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Embodiment Construction

[0040] The maintenance of a large bridge in Wuhan adopts external prestressing technology to reinforce the bridge. A total of 40 external cables are designed, and each external cable has 12 steel strands. The layout of external cables is shown in the schematic diagram of external cable layout (Figure 1, Figure 2, Figure 3). , as shown in Figure 4, Note: There are more than these three types of external cable arrangements).

[0041] External prestressing arrangement:

[0042] 1. 13 # ~16 # The external prestressing arrangement of the upstream and downstream boxes of the continuous rigid frame of the pier:

[0043] (1), 13 # ~16 # The external prestressed beams of the continuous rigid frame of the pier are arranged with 4 beams per box with a span of 83m and a span of 130m. 8 beams are arranged across 125m, of which 4 beams and 4 beams across 130m are common beams.

[0044] (2) As shown in Figure 3, the 83m cross-body bundle is at 16 # Fixed at the bottom plate of the pie...

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Abstract

The invention discloses an external prestressing construction method for box bridge maintenance, which is characterized in that: 1). The position of an anchor block, a redirector and a shock absorber are decided according to external cable arranging mode for external prestressing; 2). The installation of the anchor block: 2.1). concrete base surface processing; 2.2). hole drilling, hole cleaning and reinforcing bar planting; 2.3). the installation of steel-bonded steel plate: the anchor block comprises a steel-bonded steel plate, a connecting plate and a stiffening plate; all anchor bolts are penetrated through a corresponding fixing hole on the steel-bonded steel plate; 2.4). the installation of other steel plates for the anchor block; the connecting plate is welded with the steel-bonded steel plate, the stiffening plate is welded with the steel-bonded steel plate and is provided with a through hole for external cable; 2.5). glue pouring for the steel-bonded steel plate: glue pouring is made between the steel-bonded steel plate and the concrete base surface for the anchor block; 3). Horizontal partition wall perforation; 4). The installation of a redirecting support and a damping support; 5). The installation of the redirector; 6). Penetrating and tension of prestressing steel strand; 7). The installation of the shock absorber. The invention has the advantages of convenient construction, flexibility and stronger reliability.

Description

technical field [0001] The invention relates to an external prestressing construction method for box-type bridge maintenance. Background technique [0002] In order to limit the continuous downward deflection of the beam body and increase the compressive stress reserve of the section, in the maintenance of box bridges, external cables are generally set as one of the main measures to solve the downward deflection of the beam body. The existing external cables are directly anchored to the transverse partition wall, or they are anchored by newly poured concrete; when the transverse partition wall is too thin to fully bear the external cable force, or when there is no anchoring space behind the transverse partition wall, the bearing capacity of the anchoring block shall be designed separately; When the concrete transportation is inconvenient, the newly poured concrete cannot be used for anchoring; and when the beam body is cracked, the water of the newly poured concrete can easi...

Claims

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Application Information

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IPC IPC(8): E01D22/00E01D2/04
Inventor 郑泽武张海峰王春兰林宗辉
Owner CHINA FIRST METALLURGICAL GROUP
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