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Inner tensioning pre-stressed concrete double-layer variable section plate box-type structure

A concrete and prestressed technology, applied in structural elements, building components, building structures, etc., can solve problems such as poor durability, limited heavy-duty structures, and general economy, so as to achieve constant project cost and reduce land occupation The effect of area, comfort and usability

Active Publication Date: 2012-09-05
BEIJING RAIL TRANSIT CONSTR MANAGEMENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the prestressed structure, this ordinary concrete structure has larger deformation, poor crack resistance, poor durability, and general economy, which limits the further application of long-span and heavy-duty structures.

Method used

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  • Inner tensioning pre-stressed concrete double-layer variable section plate box-type structure
  • Inner tensioning pre-stressed concrete double-layer variable section plate box-type structure
  • Inner tensioning pre-stressed concrete double-layer variable section plate box-type structure

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] exist figure 1 , 2 , 3, the annular curved prestressed beam (1) is a plane closed curve, composed of 8 prestressed steel strands, the annular curved prestressed beam (1) is laid, and the tension of the annular curved prestressed beam (1) The drawing groove (5) is reserved on the inner side of the middle span of the variable cross-section roof / bottom plate (9). Each section of (1) is connected end to end in sequence, and then stretched at any stretching end (4 or 6) of the middle anchorage, and after the stretching is completed, the stretching groove (5) can be blocked as required. The embodiment of the positive and negative parabolic prestressed beams (12) is basically the same as that of the annular curved prestressed beams (1).

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PUM

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Abstract

The invention relates to an inner tensioning pre-stressed concrete double-layer variable section plate box-type structure of a building. A variable section plate is arranged in the direction parallel to the section of the structure to form a double-layer box-type section, the span range of the variable section plate is 7 to 36 meters, annular prestressed ribs are arranged in a peripheral member, parabolic prestressed ribs are arranged in a flat plate on the middle layer, and tensioning grooves are reserved on the lateral surfaces of a member in the structure; and when concrete reaches the specified strength, the segments of the same prestressed ribs are sequentially connected end to end through middle anchors at the tensioning grooves and tensioned, and then the tensioning grooves are plugged. The structure is characterized in that the tensioning grooves are reserved on the lateral surfaces of the member in the structure, and the prestressed ribs are connected through the middle anchors and tensioned. The structure has the advantages that when the ends of the structural member do not have tensioning and anchoring conditions, prestressed tensioning connection can be realized, high comfort degree, using performance and structural performance can be provided, and the structure is particularly suitable to be used as an underground heavy-duty and large-span double-layer framework box-type structure.

Description

Technical field [0001] The invention relates to a post-tensioned prestressed concrete double-layer variable-section slab box structure of a building, especially when the prestressed tendon tension and anchorage conditions are not available at the end of the component, the side of the concrete component inside the structure is connected and fixed. Post-tensioned prestressed concrete double-layer variable-section slab box structure with tensioned prestressed tendons. Background technique [0002] At present, the well-known post-tensioned prestressed concrete double-layer variable-section slab box structure is to first install the post-tensioned prestressed tendons to form holes, construct steel bars and parts, and then install formwork and pour concrete. The prestressed tendons can be inserted into the casing first or later. After the concrete reaches the strength, the prestressed tendon is stretched to the required stress with a jack and anchored at both ends of the componen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/00E04C5/02E04G21/12
Inventor 乐贵平刘明保徐凌朱胜利吴林林胡程鹤齐虎聂永明宫剑飞任正录冯大斌于滨
Owner BEIJING RAIL TRANSIT CONSTR MANAGEMENT