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Sectional anchoring structure for box girder internal prestressing tendon

A technology of prestressed beams and anchorage structures, applied to bridges, bridge parts, bridge materials, etc., can solve problems affecting the quality of concrete, inconvenient tensioning operations, and difficult vibrations, etc., to facilitate construction tensioning operations, reduce Dimensions, the effect of reducing cracking reinforcement

Inactive Publication Date: 2017-04-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires adding anti-cracking steel bars around the anchor block, especially at the rear, resulting in dense steel bars in this area, making it difficult to vibrate during concrete pouring, and affecting the quality of concrete
Since the prestressed beam contains more prestressed tendons, large-tonnage tensioning equipment is required to enter the box girder, and the tensioning operation is inconvenient

Method used

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  • Sectional anchoring structure for box girder internal prestressing tendon
  • Sectional anchoring structure for box girder internal prestressing tendon
  • Sectional anchoring structure for box girder internal prestressing tendon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] For a schematic diagram of the structure of this embodiment, see figure 2 , On the bottom plate (4) of the box girder, a prestressed beam (3) is installed. In order to avoid the cracking of the concrete around the anchor block when there is an anchor block at each end of the prestressed beam (3), the main anchor block (1) After setting the auxiliary anchor block (2), the clear distance between the main anchor block (1) and the auxiliary anchor block (2) is the length of one main anchor block (1). Correspondingly, 4 steel strands are taken out of the prestressed bundle (3) and anchored on the auxiliary anchor plate (6), and most of the remaining parts are still anchored on the main anchor plate (5). During construction, the long sub-beam (8) of the pre-stressed beam is penetrated first, and then the short sub-beam (7) of the pre-stressed beam is penetrated. During tensioning, the short sub-beam (7) of the prestressing beam is first tensioned, and then the long sub-beam...

Embodiment 2

[0020] For a schematic diagram of the structure of this embodiment, see image 3 and Figure 5 , Different from the second embodiment, the structure of the present invention is arranged on the top plate (9) of the box girder, and the corrugated pipe adopts plastic corrugated pipe. Correspondingly, the prestressed channel branch connector (11) is also made of plastic. When installing the bellows, use the prestressed channel branch connector (11) to connect each section of the plastic bellows.

Embodiment 3

[0022] The schematic diagram of the structure in this embodiment is as follows Figure 4 As shown, at the end of the bottom plate of the box girder, the prestressed beam is anchored to the beam end anchor plate (10) of the end section of the bottom plate, and one end of the inner side adopts the segmented anchoring structure of the stress beam of the present invention.

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Abstract

The invention relates to a sectional anchoring structure for a box girder internal prestressing tendon. The sectional anchoring structure for the box girder internal prestressing tendon comprises a main anchoring block, an auxiliary anchoring block, a main anchoring plate and an auxiliary anchoring plate, wherein the main anchoring block and the auxiliary anchoring block are arranged on a box girder bottom plate; the main anchoring plate and the auxiliary anchoring plate are respectively placed on the main anchoring block and the auxiliary anchoring block. A small part of the same prestressing tendon is anchored on the auxiliary anchoring block. Compared with the traditional anchoring method, the invention is advantaged in that cracks, caused by tensioning prestressing force, generated on the upper surface of an anchoring block surrounding bottom plate can be effectively prevented; crack-prevention steel bars around the anchoring blocks can be reduced; concrete is convenient to pour and vibrate; the dimensions of the anchoring blocks are also reduced; small-sized tensioning equipment can be adopted; and the tensioning operation is convenient to perform. The durability of the sectional anchoring structure can be enhanced and the service life of the sectional anchoring structure can be also prolonged.

Description

technical field [0001] The invention relates to a segmented anchoring structure of prestressed bundles in a box girder, belonging to the field of bridge engineering. Background technique [0002] Prestressed concrete members have good crack resistance and high stiffness, and have been widely used in bridge engineering. However, a large number of prestressed beams are required in long-span bridges, and the tension tonnage is large. After a large number of prestressed holes are reserved on the section, the compression area of ​​the section during construction is seriously reduced, the precompression stress in the section is high, and the risk of section compression damage during construction is increased. After the prestressed steel bars are tensioned and anchored in the bridge beam, a tensile stress zone will appear on the beam plate outside the anchor block, and cracks are prone to occur. This requires the addition of anti-crack reinforcement around the anchor block, espec...

Claims

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Application Information

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IPC IPC(8): E01D19/14E01D2/04E01D101/28
CPCE01D19/14E01D2/04E01D2101/28
Inventor 魏建东宋粉丽
Owner ZHENGZHOU UNIV