Inner tensioning pre-stressed concrete double-layer variable section plate box-type structure
A concrete and prestressed technology, applied in the direction of structural elements, building components, building structures, etc., can solve the problems of poor durability, limited heavy-duty structure, general economy, etc., to achieve the same project cost and reduce land occupation. The effect of area, good comfort and performance
Active Publication Date: 2013-09-11
BEIJING RAIL TRANSIT CONSTR MANAGEMENT +1
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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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Embodiment Construction
[0018] in figure 1 , 2 , 3, the ring-shaped curve pre-stressed strand (1) is a flat closed curve, composed of 8 pre-stressed steel strands, laid the ring-shaped curve pre-stressed strand (1), the tension of the ring-shaped curved pre-stressed strand (1) The draw groove (5) is reserved on the inner side of the variable cross-section top plate / bottom plate (9). When the concrete is poured and reaches the specified strength, the tension groove (5) is used to prestress the circular curve through the middle anchor (3) The sections of (1) are connected in order from end to end, and then stretched at any pull end (4 or 6) of the middle anchorage. After the stretch is completed, the stretch groove (5) can be sealed as required. The implementation of the positive and negative parabolic prestressed strands (12) is basically the same as the circular curved prestressed strands (1).
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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 cross-section board box structure of a building, especially when the prestressed tendon tension and anchoring conditions are not available at the end of the component, the side of the concrete component inside the structure is connected and connected. Post-tensioned pre-stressed concrete double-layer variable-section board box structure of tensioned pre-stressed tendons. Background technique [0002] At present, the well-known post-tensioned prestressed concrete double-layer variable cross-section board box structure is to first install the casing, structural steel bars and parts of the post-tensioned prestressed bar to form holes, and then install the formwork and pour the concrete. The prestressing tendons can be inserted into the casing first or afterwards. After the concrete reaches the strength, the pre-stressed tendons are stretched to the required stress with a jack...
Claims
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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