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Temporary prestressing structure for prefabricating segment splice-installing type bridge

A technology of prestressed structures and segmental beams, which is applied in erection/assembly of bridges, bridges, bridge construction, etc., can solve problems affecting the local strength of bridges, hidden dangers of bridge durability, etc., and achieve the effect of ensuring integrity and saving construction time

Pending Publication Date: 2019-06-07
SHANGHAI HIGHWAY BRIDGE (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires additional steel sills to assist, and it is necessary to reserve opposite holes in the permanent structure of the segmental beams, which will not only affect the local strength of the roof and floor structures of the bridge, but also cause hidden dangers to the durability of the bridge.

Method used

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  • Temporary prestressing structure for prefabricating segment splice-installing type bridge
  • Temporary prestressing structure for prefabricating segment splice-installing type bridge
  • Temporary prestressing structure for prefabricating segment splice-installing type bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A U-shaped segmental beam with two webs is selected, and its segment is integrally cast with concrete. The prefabricated segment of the concrete beam is divided into two parts: the bottom plate and the flange plate (web). The beam is 29.4m long and 2.2m high. The top width is 9.928m, and the bottom width is 7.706m; there are two flange plates, which are respectively arranged at both ends of the bottom plate, and the support adopts double-point support of the beam. Each span beam is composed of 10 segment beams, each about 40t.

[0031] The upper surface plane of the bottom plate and the plane at the top of the web are used as the outer surface 1, and grooves are made at the intersecting position of the section 2 to form a cubic groove 3 that runs through the outer surface 1 and the section 2; the groove 3 is a cuboid (without the top surface) and front face).

[0032] In the groove 3, only one elevation (i.e., the rear end face of the cuboid) is parallel to the section...

Embodiment 2

[0047] Box-shaped segmental beams are selected, which are cast in one piece. Each span beam is composed of 10 segmental beams, each about 40t.

[0048] Make grooves at the intersection position of the upper outer surface 1 of the bottom plate and the cross section 2, and make grooves at the intersection position of the upper outer surface 1 of the top plate and the cross section 2 to form a cubic groove 3 passing through the outer surface 1 and the cross section 2; the rest of the structure and construction methods are implemented in the same way example 1.

[0049] After the splicing and other constructions of the various segments of the overall bridge are completed at last, after the permanent prestressed fastening is carried out, the length of the beam group of the bridge segment is longer, and the screw connector 9 can be removed in sections from the groove 3 in the middle, and then the long screw can be used to Deformable feature, directly extract the respective stretchin...

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Abstract

The invention belongs to the technical field of bridge construction, and particularly relates to a temporary prestressing structure for prefabricating a segment splice-installing type bridge. Groovesare formed in the intersectant edge positions of the outer surfaces of a top plate, a bottom plate and / or a web plate with a cross section of an existing bridge section, and the grooves cut through the outer surfaces and the cross section; pressure-bearing surfaces for tensioning temporary prestress are arranged in the grooves; and the corresponding grooves formed in the front side and the rear side of a segment communicate with each other through temporary prestress hole channels for letting tensioning threaded rods pass through. The temporary prestressing structure for prefabricating the segment splice-installing type bridge has the advantages that the temporary prestress hole channels and the grooves are reserved on the segment, positioning holes for installing temporary prestressing steel tooth braces longitudinally formed in a beam body are omitted, and the risk of damaging the structure of the beam body is avoided; meanwhile, adjacent segment beams are connected by putting in steel bars when reserved groove channels are subjected to pouring finally, and the integrality of an integral span beam is ensured; and the traditional steps of installing and disassembling the steel tooth braces and filling and trowelling the positioning holes are omitted, and the construction time is greatly saved.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a temporary prestressed structure for a prefabricated segmental assembled bridge. Background technique [0002] The principle of the segmental prefabricated assembly construction method is to divide the bridge superstructure into several standard segmental beams. Blocks are combined and prestressed at the same time to make it an integral structure, and it is pushed forward and assembled span by span along the predetermined installation direction. [0003] It is suitable for the construction of superstructure box girders or channel girders with medium spans (30-50m) and long total bridge lengths at sea, large rivers and lakes, mountain bridges, urban viaducts and light rails; and it is most suitable for projects with tight schedules . [0004] In the assembly process of the entire span segment, before the permanent prestressing construction of the structu...

Claims

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Application Information

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IPC IPC(8): E01D21/00
Inventor 蒋海里王会丽严凯倪文全王炎炎
Owner SHANGHAI HIGHWAY BRIDGE (GRP) CO LTD