Directional metal fiber reinforced butterfly-shaped concrete slab

Abstract

The utility model relates to a directional metal fiber reinforced butterfly-shaped concrete slab which comprises a concrete slab main body, and arc-shaped grooves are formed in the two sides of the concrete slab main body in an inward and opposite concave mode so that the concrete slab main body can be in a butterfly shape. The middles of the two arc-shaped grooves extend in the tangential direction of the arc-shaped grooves to separate a parallelogram-like tension-compression mixed stress area and two main pressure stress areas with trapezoid-like opposite angles in the concrete slab body area, and the tension-compression mixed stress area and the main pressure stress areas are formed through pouring of concrete doped with metal fibers. The metal fibers in the tension-compression mixed stress area are directionally distributed in a consistent direction after a directional magnetic field is applied, the metal fibers in the main pressure stress area are distributed in a disordered direction, the structural design is reasonable, industrial production can be achieved, and the production efficiency is improved. The method has the advantages of being convenient to construct, reducing structural dead weight, improving structural size precision and quality and reducing the steel bar consumption of the structure.

Description

Technical Field

[0001] The utility model relates to a butterfly-shaped concrete slab reinforced with directional metal fibers. Background Art

[0002] Traditional concrete box structures have good stability and bending and torsion resistance, and are often used in main beams in beam bridges or arch ribs in arch bridges. As the span of the bridge increases, the self-weight of the structure becomes larger and larger, the concrete web is prone to cracking, and the construction is difficult, which are the main factors restricting its application. Although the steel web (rod)-mixed combined box structure improves the shortcomings of the traditional concrete box structure, the structure uses a large amount of steel, has high construction and maintenance costs, poor durability, and complex connections at the nodes. Therefore, prestressed fiber reinforced concrete butterfly plates are used to replace traditional concrete webs or steel webs (rods), which not only reduces the self-weight of the web, but also improves the durability of the web. Among them, the stress of the prestressed fiber reinforced concrete butterfly plate is similar to that of a double Warren truss, with obvious tension and compression mixed stress areas and main compression stress areas. Utility Model Content

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a butterfly concrete slab reinforced with directional metal fibers, which can fully exert the contribution of metal fibers to the tensile properties of concrete by directional distribution of metal fibers in the tensile and compressive mixed stress area of ​​the butterfly slab, so that the butterfly slab does not need to be equipped with prestressed steel strands or ordinary steel bars, forming a butterfly concrete slab reinforced with directional metal fibers, which can be used as the web of a box beam or box arch rib. The butterfly concrete slab reinforced with directional metal fibers maximizes the improvement of the tensile properties of concrete by metal fibers on the basis of retaining the advantages of the original structure, reduces the amount of steel bars used, and further reduces the construction cost.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a butterfly-shaped concrete slab reinforced with oriented metal fibers, comprising a concrete slab body, wherein arc-shaped grooves are concave inwardly on both sides of the concrete slab body to make the concrete slab body butterfly-shaped, and the middle parts of the two arc-shaped grooves extend along their tangent directions to divide the concrete slab body into a parallelogram-shaped tension-compression mixed stress zone and two diagonal trapezoidal main pressure stress zones, wherein both the tension-compression mixed stress zone and the main pressure stress zone are cast and formed by concrete mixed with metal fibers; the metal fibers in the tension-compression mixed stress zone are distributed in a consistent direction after applying a oriented magnetic field, and the metal fibers in the main pressure stress zone are distributed in a random direction.

[0005] Furthermore, the two main compressive stress zones are centrally symmetrically arranged at diagonals on both sides of the concrete slab body.

[0006] Furthermore, the orientation of the metal fibers in the tension-compression mixed stress zone is consistent with the length extension direction of the tension-compression mixed stress zone.

[0007] Furthermore, the butt joint surfaces of the tension-compression mixed stress zone and the main compression stress zones on both sides thereof are corrugated and cast together.

[0008] Furthermore, the tension-compression mixed stress zone and the main compression stress zone are both cast by high-performance concrete or ultra-high-performance concrete.

[0009] Furthermore, the metal fiber is steel fiber or stainless steel fiber.

[0010] Compared with the prior art, the utility model has the following beneficial effects: by adopting factory prefabrication and directional metal fiber technology, the high-performance concrete or ultra-high-performance concrete butterfly plate mixed with metal fibers can give full play to the tensile performance of the tensile and compressive mixed stress zone and the compressive performance of the main pressure stress zone under the condition that the metal fiber content remains unchanged, so that the configuration of steel bars or prestressed steel strands is not required or reduced in the butterfly plate, saving labor and material costs, and reducing carbon emissions. The utility model has a simple structure, reasonable design, convenient construction, and improves comprehensive economic benefits.

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 It is a schematic diagram of the preparation of an embodiment of the utility model;

[0014] Figure 3 It is a schematic diagram of the connection between the butterfly-shaped concrete slab plastic mold and the corrugated plastic partition in the embodiment of the utility model.

[0015] In the figure: 1-concrete slab body, 2-arc groove, 3-butterfly-shaped concrete slab plastic mold, 4-tension-compression mixed stress area, 5-main compression stress area, 6-metal fiber, 7-corrugated plastic partition, 8-electromagnetic controller, 9-electromagnetic coil. DETAILED DESCRIPTION

[0016] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below with reference to the accompanying drawings for detailed description as follows.

[0017] like Figures 1 to 3As shown, a butterfly-shaped concrete slab reinforced with oriented metal fibers comprises a concrete slab body 1, wherein arc grooves 2 are concave inwardly on both sides of the concrete slab body to make the concrete slab body butterfly-shaped, and the middle parts of the two arc grooves extend along their tangent directions to divide the concrete slab body into a parallelogram-like tension-compression mixed stress zone 4 and two diagonal trapezoidal main pressure stress zones 5, wherein both the tension-compression mixed stress zone and the main pressure stress zone are cast and formed by concrete mixed with metal fibers 6; the metal fibers in the tension-compression mixed stress zone are distributed in a consistent direction after applying a oriented magnetic field, and the metal fibers in the main pressure stress zone are distributed in a random direction.

[0018] In the embodiment of the utility model, the two main pressure bearing areas are centrally symmetrically arranged at opposite corners on both sides of the concrete slab body.

[0019] In the embodiment of the utility model, the orientation of the metal fibers in the tension-compression mixed stress zone is consistent with the length extension direction of the tension-compression mixed stress zone.

[0020] In the embodiment of the utility model, the joint surfaces of the tension-compression mixed stress zone and the main pressure stress zones on both sides thereof are corrugated and cast together.

[0021] In the embodiment of the utility model, the tension-compression mixed stress zone and the main pressure stress zone are both cast by high-performance concrete or ultra-high-performance concrete.

[0022] In an embodiment of the present invention, the metal fiber is steel fiber or stainless steel fiber.

[0023] The preparation method of the embodiment of the utility model first needs to prepare a butterfly-shaped concrete slab plastic mold 3 and a corrugated plastic partition 7 for separating the tension-compression mixed stress zone and the main pressure stress zone, as well as an electromagnetic controller 8 and an electromagnetic coil 9 for magnetization:

[0024] (1) Place the butterfly-shaped concrete slab plastic mold horizontally and install a corrugated plastic partition in the butterfly-shaped concrete slab plastic mold to separate the tensile and compressive mixed stress area of ​​the concrete slab body from the main compressive stress area;

[0025] (2) Magnetizing the metal fiber;

[0026] (3) Using magnetized metal fibers, cementitious materials, quartz sand, quartz powder, water reducer and other materials to prepare metal fiber reinforced high performance concrete or ultra-high performance concrete;

[0027] (4) Pour the mixed high-performance concrete or ultra-high-performance concrete grouting material into the tension-compression mixed stress area of ​​the butterfly-shaped concrete slab plastic mold. After the grouting is in place, place the plastic mold on a vibration table and vibrate it to expel the bubbles inside the concrete;

[0028] (5) placing the concrete slab in the annular electromagnetic coil and applying power to it, applying a directional magnetic field to the metal fibers in the concrete slab to complete the directional arrangement of the metal fibers, cutting off the current and removing the concrete slab from the annular electromagnetic coil;

[0029] (6) Pour the mixed high-performance concrete or ultra-high-performance concrete grouting material into the main compressive stress area of ​​the butterfly concrete slab. When the concrete height of the main compressive stress area is equal to that of the tensile-compression mixed stress area, slowly remove the corrugated plastic partition and lightly vibrate the plastic mold shell to make the concrete at the junction of the tensile and compressive areas bonded into a whole. The vibration process should avoid disturbing the oriented metal fibers.

[0030] (7) After the main body of the concrete slab is cured indoors for 24 hours, the formwork is removed, and then the main body of the concrete slab is moved into a standard curing room for curing for 28 days or steam-cured for 2 to 3 days. The preparation of the butterfly-shaped concrete slab reinforced with oriented metal fibers is completed.

[0031] The utility model is not limited to the above-mentioned best implementation mode. Anyone can derive other forms of butterfly-shaped concrete slabs reinforced with directional metal fibers under the inspiration of the utility model. All equivalent changes and modifications made according to the scope of the patent application of the utility model shall fall within the scope of the utility model.

Claims

1. A butterfly-shaped concrete slab reinforced with oriented metal fibers, characterized in that: The invention comprises a concrete slab body, wherein arc grooves are concave inwardly on both sides of the concrete slab body to make the concrete slab body butterfly-shaped, and the middle parts of the two arc grooves extend along their tangent directions to separate a parallelogram-shaped tension-compression mixed stress zone in the concrete slab body area and two diagonal trapezoidal main pressure stress zones, and the tension-compression mixed stress zone and the main pressure stress zone are both cast and formed by concrete mixed with metal fibers; the metal fibers in the tension-compression mixed stress zone are distributed in a consistent direction after applying a directional magnetic field, and the metal fibers in the main pressure stress zone are distributed in a random direction.

2. The butterfly-shaped concrete slab reinforced with oriented metal fibers according to claim 1, characterized in that: The two main compressive stress zones are symmetrically arranged diagonally on both sides of the concrete slab body.

3. The butterfly-shaped concrete slab reinforced with oriented metal fibers according to claim 1, characterized in that: The orientation of the metal fibers in the tension-compression mixed stress zone is consistent with the length extension direction of the tension-compression mixed stress zone.

4. The butterfly-shaped concrete slab reinforced with oriented metal fibers according to claim 1, characterized in that: The butting surfaces of the tension-compression mixed stress zone and the main pressure stress zones on both sides thereof are corrugated and cast together.

5. The butterfly-shaped concrete slab reinforced with oriented metal fibers according to claim 1, characterized in that: The tension-compression mixed stress zone and the main compression stress zone are both cast by high-performance concrete or ultra-high-performance concrete.

6. The butterfly-shaped concrete slab reinforced with oriented metal fibers according to claim 1, characterized in that: The metal fibers are steel fibers or stainless steel fibers.

Images