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Large-span rib type prestressed concrete slab and construction method thereof

A concrete slab and prestressing technology, which is applied to floors, building components, buildings, etc., can solve problems such as slab rib end cracking, stress concentration, and self-weight increase, so as to improve smoothness and smoothness, reduce stress concentration, and crack resistance. Improved effect

Active Publication Date: 2014-03-12
CHINA INST OF BUILDING STANDARD DESIGN & RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a large-span rib-type prestressed concrete slab and its construction method, to solve the problem that the traditional concrete roof slab has a small span, and the stress increases, which causes the prestressed concrete slab to be unevenly stressed, and the force conduction route changes suddenly. Stress concentration, slab rib end cracking, slab surface arching and cracking technical problems; it is also necessary to solve the technical problems of insufficient surface smoothness, resulting in unsmooth demoulding, increased self-weight, and waste of steel

Method used

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  • Large-span rib type prestressed concrete slab and construction method thereof
  • Large-span rib type prestressed concrete slab and construction method thereof
  • Large-span rib type prestressed concrete slab and construction method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1 see figure 1 As shown, a large-span rib-type prestressed concrete slab includes a reinforced concrete slab body, the slab body includes a panel 1, a longitudinal main rib 2, a transverse auxiliary rib 3 and steel strands, the main rib 2 and the auxiliary rib The rib 3 intersects vertically, the connection transition part between the main rib 2 and the panel 1 is a concave smooth curved surface a7, the prestressed main reinforcement of the main rib 2 is a steel strand, and the connection transition part between the auxiliary rib 3 and the panel 1 Both are concave smooth curved surfaces b8, and the cross-section of the secondary rib 3 is a constant cross-section or a variable cross-section with enlarged ends.

[0038] see figure 1 As shown, in this embodiment, the size of the plate body can be designed to be 1.5m×12.0m (H×L), and the maximum height of the main rib and the auxiliary rib varies with the longitudinal length of the panel. Due to the span larger, s...

Embodiment 2

[0041] See Example 2 Figure 9 As shown, the difference from the first embodiment is that the plate width of the second embodiment reaches 3000mm, so the longitudinal center axis of the lower surface of the plate body is also provided with a middle rib 4 that is the same height as the main rib 2. The auxiliary ribs 3 intersect vertically, and the connecting transition parts between the middle rib 4 and the panel 1 and the auxiliary ribs 3 are all concave smooth curved surfaces b.

[0042] The four corners on the upper side of the plate body are provided with hoisting rings 5 ​​, and the corners on the lower side are provided with connecting plates 6 .

[0043] After the optimized design, the large-span rib-type prestressed concrete slab configuration of the present invention is adopted for the slab with the same slab cross-section, and the amount of main reinforcement reinforcement is effectively reduced. increase, see the following test data:

[0044] plate sectio...

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Abstract

The invention discloses a large-span rib type prestressed concrete slab and a construction method thereof. The large-span rib type prestressed concrete slab comprises a reinforced concrete slab body, wherein the slab body comprises a panel, longitudinal main ribs, transverse auxiliary ribs and steel strands, the main ribs and the auxiliary ribs are vertically intersected, the connecting transition parts of the main ribs and the panel are all concave smooth curved surfaces a, prestressed main ribs of the main ribs are the steel strands, the connecting transition parts of the auxiliary ribs and the panel are all concave smooth curved surfaces b, and the cross section of each auxiliary rib is a fixed section or a variable section with two expanded ends. The height of each main rib is 1 / 25-1 / 30 of the longitudinal length of the panel. Each main rib is provided with at least one steel strand. The invention solves the technical problems of end check of the slab ribs, and reverse arch and cracking of the slab surface which are caused by the fact that the span of the conventional concrete roof panel is small, the prestressed concrete slab is unevenly stressed after the stress is increased, and stress is concentrated after sudden change of a force conduction path, and the problems such as bad demolding, larger weight and waste of steel products which are caused by unreasonable surface curve transition are also solved.

Description

technical field [0001] The invention relates to a building component and a construction method thereof, in particular to a rib-shaped prestressed concrete slab applied to a large-span building and a construction method thereof. Background technique [0002] The column layout of concrete single-story industrial workshops generally still follows the rules formulated in the 1950s, mainly 6m column spacing. In recent years, it has gradually failed to meet the needs of production and use, especially when building large-span workshops, one of the transformation methods is Expand the longitudinal column net. To expand the longitudinal column network, the span of the roof slab needs to be increased first. The existing prestressed concrete roof slab usually has a span of 6m. [0003] It has the characteristics of low cost, good durability and low maintenance cost, especially in humid and corrosive environments. However, when it is used in large-span workshops, due to the design of c...

Claims

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Application Information

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IPC IPC(8): E04B5/32E04B5/43E04G21/00
Inventor 吴燕燕吕丰模王文顺陈九雪
Owner CHINA INST OF BUILDING STANDARD DESIGN & RES