Layout structure of post-tensioning prestressed steel strands in concrete floor plate
By setting up multi-layer steel mesh on the bottom formwork of concrete floor slabs and fixing steel strands with longitudinal bars and tensioners in beam formwork, the problem of cumbersome layout and easy fall off of prestressed steel strands is solved, and the problem of complications and easy falling off is achieved. Stable tensioning effect of ultra-long floor slab concrete.
Patent Information
- Application Number
- CN202421236020.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-06-03
AI Technical Summary
When pouring ultra-long concrete floor slabs, the layout of prestressed steel strands in the prior art is complicated and easy to fall off on the bottom formwork of the floor slab, affecting the tensioning effect.
By setting concrete pads and multi-layer reinforced mesh on the bottom formwork on the floor slab, and using longitudinal bars and tensioners in the left and right beam forms, the steel strands are fixed and tensioned to make them stable in the concrete middle.
The stable layout of prestressed steel strands is achieved, avoiding the phenomenon of steel strands falling when pouring concrete, and ensuring the effective tensioning effect of ultra-long floor slab concrete.
Smart Images
Figure CN222478185U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a concrete floor slab, in particular to a layout structure of post-tensioned prestressed steel strands in a concrete floor slab. Background Art
[0002] In the civil construction of sports venues, large-span concrete floor slab structures are often encountered. Concrete frame beams are arranged at intervals below the large-span concrete floor slabs to form support for the large-span floor slabs. In order to avoid temperature cracks in the large-span floor slab concrete, it is necessary to apply prestressing tensioning to the poured concrete floor slabs; the prestressed steel strands used for prestressing tensioning are pre-arranged in the steel mesh on the floor slab casting formwork. In order to achieve a better tensioning effect, the design requires that the steel strands be arranged in the center of the steel mesh. The prior art is to pre-fabricate concrete pads for steel strands, lay the concrete pads on the bottom formwork of the floor slab, and erect the steel strands on the top of the concrete pads. This arrangement requires prefabrication of a large number of steel strands to support the concrete pads, and there are also defects such as cumbersome positioning and arrangement of the pads. When pouring concrete, the steel strands often fall onto the bottom formwork, which directly affects the subsequent tensioning effect of the prestressed steel strands. Summary of the invention
[0003] The utility model provides a layout structure for post-tensioned prestressed steel strands in a concrete floor slab, which solves the technical problems of cumbersome layout and easy falling off of the prestressed steel strands on the floor slab casting bottom formwork when casting an extra-long floor slab.
[0004] The utility model solves the above technical problems through the following technical solutions:
[0005] A layout structure of post-tensioned prestressed steel strands in a concrete floor slab, comprising a floor slab casting bottom template, a concrete pad is arranged on the floor slab casting bottom template, a lower steel mesh is arranged on the concrete pad, an upper steel mesh is arranged above the lower steel mesh, a left beam template and a right beam template are respectively connected to the floor slab casting bottom template, a left beam upper longitudinal reinforcement and a left beam lower longitudinal reinforcement are arranged in the left beam template, a right beam upper longitudinal reinforcement and a right beam lower longitudinal reinforcement are arranged in the right beam template, and the left beam upper longitudinal reinforcement and the right beam upper longitudinal reinforcement are arranged at a height higher than the lower steel mesh. At the position where the reinforcement mesh is lower than the upper steel mesh, a steel strand end fixing anchor plate is arranged on the left side of the left beam formwork, and a tensioner is arranged above the upper steel mesh on the right side of the right beam formwork. One end of the tensioning steel strand is fixedly connected to the steel strand end fixing anchor plate, and the other end of the tensioning steel strand passes through the gap between the upper longitudinal reinforcement of the left beam and the upper steel mesh in the left beam formwork, the space between the lower steel mesh and the upper steel mesh on the floor slab casting bottom formwork, and the gap between the upper longitudinal reinforcement of the right beam and the upper steel mesh in the right beam formwork, and then is connected to the tensioner.
[0006] The left end of the tensioning steel strand is connected to the upper longitudinal reinforcement of the beam through a tie wire, the middle part of the tensioning steel strand is connected to the lower steel mesh through a middle binding wire, and the right end of the tensioning steel strand is connected to the upper longitudinal reinforcement of the right beam through a tie wire.
[0007] Concrete is poured in the left beam formwork, on the floor slab casting bottom formwork and in the right beam formwork, and the tensioning steel strands are arranged in the poured concrete.
[0008] The utility model can deepen the whole-section layout of the prestressed steel strand on site into a multi-section layout. After the reinforcement of the lower part of the floor slab is tied, the position of the prestressed tendons is determined in combination with the design drawings. The natural curve formed by the relaxation performance of the prestressed steel strand itself is firmly tied and fixed to the lower steel mesh with binding wires, thereby ensuring that the prestressed steel strand is set in the poured concrete of the floor slab, thereby achieving the tensioning effect of the concrete of the extra-long floor slab. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a structural schematic diagram of the utility model;
[0010] Figure 2 It is a schematic diagram of the structure of the utility model after pouring concrete. DETAILED DESCRIPTION
[0011] The utility model is described in detail below with reference to the accompanying drawings:
[0012] A layout structure of post-tensioned prestressed steel strands in a concrete floor slab, comprising a floor slab casting bottom formwork 3, a concrete pad 4 is arranged on the floor slab casting bottom formwork 3, a lower steel mesh 5 is arranged on the concrete pad 4, an upper steel mesh 8 is arranged above the lower steel mesh 5, a left beam formwork 1 and a right beam formwork 6 are respectively connected to the floor slab casting bottom formwork 3, a left beam upper longitudinal reinforcement 2 and a left beam lower longitudinal reinforcement are arranged in the left beam formwork 1, an annular stirrup is arranged between the left beam upper longitudinal reinforcement 2 and the left beam lower longitudinal reinforcement, a right beam upper longitudinal reinforcement 7 and a right beam lower longitudinal reinforcement are arranged in the right beam formwork 6, an annular stirrup is arranged between the right beam upper longitudinal reinforcement 7 and the right beam lower longitudinal reinforcement, and the left beam upper longitudinal reinforcement 2 and the right beam upper longitudinal reinforcement 7 are arranged above the lower longitudinal reinforcement of the lower layer. The steel mesh 5 is lower than the upper steel mesh 8; a steel strand end fixing anchor plate 9 is arranged on the left side of the left beam formwork 1, and a tensioner 11 is arranged above the upper steel mesh 8 on the right side of the right beam formwork 6. One end of the tensioning steel strand 10 is fixedly connected to the steel strand end fixing anchor plate 9, and the other end of the tensioning steel strand 10 passes through the gap between the upper longitudinal reinforcement 2 of the left beam in the left beam formwork 1 and the upper steel mesh 8, the space between the lower steel mesh 5 and the upper steel mesh 8 on the floor slab casting bottom formwork 3, and the gap between the upper longitudinal reinforcement 7 of the right beam in the right beam formwork 6 and the upper steel mesh 8, and then is connected to the tensioner 11, ensuring that the tensioning steel strand 10 is arranged in the middle of the precast floor slab concrete, thereby realizing effective tensioning of the concrete.
[0013] The left end of the tensioning steel strand 10 is connected to the upper longitudinal reinforcement 2 of the beam by a binding wire, the middle part of the tensioning steel strand 10 is connected to the lower steel mesh 5 by a middle binding wire 12, and the right end of the tensioning steel strand 10 is connected to the upper longitudinal reinforcement 7 of the right beam by a binding wire; the tensioning steel strand 10 is provided with an external rubber cortex, and the binding wire fixes the external rubber cortex of the tensioning steel strand 10.
[0014] Concrete 13 is poured in the left beam formwork 1, the floor slab casting bottom formwork 3 and the right beam formwork 6, and the tensioning steel strand 10 is arranged in the poured concrete 13; since the outer rubber cortex of the tensioning steel strand 10 is connected and fixed to the upper longitudinal reinforcement 2 of the beam and the lower steel mesh 5 by tying wire, the stability of the tensioning steel strand 10 is guaranteed during the concrete pouring process, and it will not fall onto the floor slab casting bottom formwork 3 under the impact of pouring concrete.
Claims
1. A layout structure for post-tensioned prestressed steel strands in a concrete floor slab, comprising a floor slab casting bottom formwork (3), a concrete pad (4) being arranged on the floor slab casting bottom formwork (3), a lower steel mesh (5) being arranged on the concrete pad (4), an upper steel mesh (8) being arranged above the lower steel mesh (5), a left beam formwork (1) and a right beam formwork (6) being connected to the floor slab casting bottom formwork (3), respectively, a left beam upper longitudinal reinforcement (2) and a left beam lower longitudinal reinforcement being arranged in the left beam formwork (1), a right beam upper longitudinal reinforcement (7) and a right beam lower longitudinal reinforcement being arranged in the right beam formwork (6), the left beam upper longitudinal reinforcement (2) and the right beam upper longitudinal reinforcement (7) being arranged at a position higher than the lower steel mesh (5) and lower than the upper steel mesh (8); characterized in that: A steel strand end fixing anchor plate (9) is arranged on the left side of the left beam template (1), and a tensioner (11) is arranged above the upper steel mesh sheet (8) on the right side of the right beam template (6). One end of the tensioning steel strand (10) is fixedly connected to the steel strand end fixing anchor plate (9), and the other end of the tensioning steel strand (10) passes through the gap between the upper longitudinal reinforcement (2) of the left beam and the upper steel mesh sheet (8) in the left beam template (1), the space between the lower steel mesh sheet (5) and the upper steel mesh sheet (8) on the floor slab casting bottom template (3), and the gap between the upper longitudinal reinforcement (7) of the right beam and the upper steel mesh sheet (8) in the right beam template (6), and then is connected to the tensioner (11).
2. The arrangement structure of post-tensioned prestressed steel strands in a concrete floor slab according to claim 1, characterized in that: The left end of the tensioned steel strand (10) is connected to the upper longitudinal reinforcement (2) of the beam through a tie wire, the middle of the tensioned steel strand (10) is connected to the lower steel mesh (5) through a middle tie wire (12), and the right end of the tensioned steel strand (10) is connected to the upper longitudinal reinforcement (7) of the right beam through a tie wire.
3. The arrangement structure of post-tensioned prestressed steel strands in a concrete floor slab according to claim 1 or 2, characterized in that: Concrete (13) is poured in the left beam formwork (1), on the floor slab casting bottom formwork (3) and in the right beam formwork (6), and the tensioning steel strands (10) are arranged in the poured concrete (13).