Inner tensioning pre-stressed concrete single-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-load 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: 2013-11-20
BEIJING RAIL TRANSIT CONSTR MANAGEMENT +3
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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] exist figure 1 , 2 , 3, the annular curved prestressed beam (1) is a plane closed curve, made up of 6 prestressed steel strands, the annular curved prestressed beam (1) is laid, and the tension groove (5) of the prestressed beam Reserved on the inner side of the middle span of the variable-section roof / bottom plate (9), when the concrete is poured and reaches the specified strength, each part of the annular curved prestressed beam (1) is connected to the tension groove (5) through the intermediate anchorage (3). The segments are connected in sequence from the beginning to the end, and then stretched at any stretching end (4 or 6) of the middle anchorage. After the stretching is completed, the reinforcement configuration should be strengthened according to the design requirements, and the stretching groove (5) can be blocked.
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The invention relates to an inner tensioning pre-stressed concrete single-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 box-type section, the span range of the variable section plate is 7 to 36 meters, prestressed ribs are arranged in the variable section plate, and tensioning grooves are reserved on the plate side faces which have low stress and facilitate construction in the structure; and when concrete reaches the specified strength, the segments of the same prestressed rib bundle 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 plate side faces which have low stress and facilitate construction 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 a structural member do not have tensioning and anchoring conditions, prestressed tensioning anchorage 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 single-layer framework box-type structure.
Description
Technical field [0001] The invention relates to a post-tensioned prestressed concrete single-layer variable-section slab box structure of a building, especially when the end of the slab does not have the conditions for tensioning and anchoring of prestressed tendons, the side of the concrete slab inside the structure is connected and fixed. Post-tensioned prestressed concrete single-layer variable-section slab box structure with tensioned prestressed tendons. Background technique [0002] At present, the well-known post-tensioned prestressed concrete single-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 slab, and the ...
Claims
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IPC IPC(8): E04B1/00E04C5/02E04G21/12
Inventor 任正录刘明保李志文聂永明宫剑飞徐凌朱胜利吴林林乐贵平冯大斌于滨
Owner BEIJING RAIL TRANSIT CONSTR MANAGEMENT