Ultra-high performance concrete non-dismantling beam formwork and concrete composite beam

Abstract

The utility model relates to the technical field of civil construction, and discloses an ultra-high performance concrete non-dismantling beam formwork and a concrete composite beam, the ultra-high performance concrete non-dismantling beam formwork comprises a beam bottom formwork and two beam side formworks, and the two beam side formworks are arranged in the length direction of the two sides of the beam bottom formwork; the long sides, connected with the beam bottom formwork, of the beam side formworks are fixedly connected through angle steel, and a plurality of reinforcing ribs are fixedly connected to the inner side walls of the beam side formworks at equal intervals. The recycled steel fiber ultra-high performance concrete formwork is adopted, the recycled steel fiber ultra-high performance concrete formwork has high rigidity, breaking strength and crack resistance, the load and deformation in the construction stage can be resisted, a plurality of reinforcing ribs are additionally arranged in the beam side formwork, and the strength of the beam side formwork is improved. The interface bonding performance of the non-dismantling beam formwork and post-pouring concrete can be effectively improved, and the integrity of the structure is guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of civil engineering and construction, and particularly relates to a formwork for super high performance concrete non-removable beam and a concrete composite beam. Background Art

[0002] At present, wooden or steel formworks are commonly used in reinforced concrete structures, and the formworks are removed after the concrete strength reaches the expected target. However, in actual use, wooden or steel formworks will bring problems such as long construction period, formwork maintenance and reuse, environmental protection and resource waste.

[0003] At present, a non-removable formwork has emerged on the market. The non-removable formwork can be formed in one time. Compared with traditional wooden formworks and steel formworks, the use of the non-removable formwork can simplify the construction process, reduce the project cost, use super high performance concrete as the permanent formwork, which can play a supporting and shaping role during the construction stage, reduce the spacing of the support structure; it can also bear the load together with the concrete to improve the durability of ordinary concrete structures. The super high performance concrete non-removable formwork can not only bear the construction load during the construction process, but also contribute bearing capacity and stiffness to the components within the service life, and there is no need to remove the formwork, which greatly simplifies the construction process and reduces the cost.

[0004] However, the high cost and high energy consumption problems of industrial fibers have significantly increased the cost of engineering projects and restricted the popularization and application of non-removable formworks. Summary of the Utility Model

[0005] The purpose of the present utility model is to solve the above problems, and a formwork for super high performance concrete non-removable beam and a concrete composite beam are proposed.

[0006] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0007] A formwork for super high performance concrete non-removable beam includes a beam bottom formwork and two beam side formworks. The two beam side formworks are arranged along the two sides of the beam bottom formwork in the length direction, and the long sides where the beam side formwork and the beam bottom formwork are connected are fixedly connected by angle steel.

[0008] Preferably, a plurality of reinforcing ribs are fixedly connected at equal intervals on the inner side wall of the beam side formwork.

[0009] Preferably, both the beam bottom formwork and the beam side formwork are recycled steel fiber super high performance concrete formworks, and are both cast and formed by recycled steel fiber super high performance concrete.

[0010] Preferably, the thicknesses of both the beam bottom formwork and the beam side formwork are 15 mm.

[0011] Preferably, the angle steel is detachably and fixedly connected to both the bottom formwork and the side formwork of the beam through bolts, and a layer of anti-corrosion paint is sprayed on the surfaces of the angle steel, the bottom formwork of the beam, and the side formwork of the beam.

[0012] A concrete composite beam includes a ultra-high performance concrete non-removable beam formwork and post-cast concrete, and the post-cast concrete is poured into the ultra-high performance concrete non-removable beam formwork.

[0013] Compared with the prior art, the present application provides a ultra-high performance concrete non-removable beam formwork and a concrete composite beam, having the following beneficial effects:

[0014] 1. The ultra-high performance concrete non-removable beam formwork is formed by splicing a bottom formwork of the beam and two side formworks of the beam. The bottom formwork of the beam and the side formworks of the beam are separately cast and formed. The construction process is simple, the transportation is convenient and fast, and the production efficiency is high. Among them, both the bottom formwork of the beam and the side formworks of the beam adopt recycled steel fiber ultra-high performance concrete formworks. The recycled steel fiber ultra-high performance concrete formworks have high stiffness, flexural strength and crack resistance, and can resist the loads and deformations during the construction stage; the non-removable beam formwork assembled with the recycled steel fiber ultra-high performance concrete formworks provides a dense and tough permanent outer shell protection layer for the internal structure, which can effectively improve the redundancy of the flexural and shear bearing capacities of the structure, control the development of cracks, improve the durability of the structure. At the same time, the recycled steel fiber ultra-high performance concrete formworks have the characteristics of high strength, high crack resistance and high durability. As the outer shell of the structural member, they can prevent harmful substances from eroding the internal steel bars, extend the service life of the structure, and the formwork forming quality is high, without secondary repair, improving the production efficiency.

[0015] 2. The ultra-high performance concrete non-removable beam formwork can effectively improve the interfacial bonding performance between the non-removable beam formwork and the post-cast concrete by arranging a plurality of reinforcing ribs in the side formwork of the beam, ensuring the integrity of the structure.

[0016] 3. The ultra-high performance concrete non-removable beam formwork, the bottom formwork of the beam and the side formworks of the beam are fixedly connected by using angle steel and bolts, which not only makes the splicing structure fast and convenient, but also has a tight connection, and can simplify the steps of filling the joints with structural adhesive after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic structural diagram of a ultra-high performance concrete non-removable beam formwork proposed by the present application.

[0018] In the figure: 1. Bottom formwork of the beam; 2. Side formwork of the beam; 3. Angle steel; 4. Reinforcing rib. DETAILED DESCRIPTION OF THE INVENTION

[0019] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0020] Referring to Figure 1 , a formwork for non-removable beam of ultra-high performance concrete includes a beam bottom formwork 1 and two beam side formworks 2. The two beam side formworks 2 are arranged along the two sides of the beam bottom formwork 1 in the length direction. At the long side where the beam side formwork 2 is connected to the beam bottom formwork 1, they are fixedly connected by an angle steel 3.

[0021] A plurality of reinforcing ribs 4 are fixedly connected at equal intervals on the inner side wall of the beam side formwork 2. The reinforcing ribs 4 are arranged on the side of the post-cast concrete to improve the bonding performance between the non-removable beam formwork and the post-cast concrete and ensure the integrity of the structure.

[0022] Both the beam bottom formwork 1 and the beam side formwork 2 are recycled steel fiber ultra-high performance concrete formworks, and are both cast and formed by recycled steel fiber ultra-high performance concrete. The ultra-high ductility concrete is mixed with cement, silica fume, fly ash, slag powder, sand, water, water reducer and steel fiber. The cement uses PO42.5 ordinary Portland cement, the water reducer uses polycarboxylate superplasticizer, the sand uses quartz sand, and the volume fraction of the recycled steel fiber is 2%; per cubic meter of ultra-high performance concrete includes 720 kg of cement, 380 kg of silica fume, 50 kg of fly ash, 100 kg of slag powder, 760 kg of fine sand, 156 kg of recycled steel fiber, 38 kg of water reducer and 225 kg of water;

[0023] Recycled steel fiber ultra-high performance concrete is a new type of fiber-reinforced cement-based composite material with high strength, high crack resistance, high toughness and high durability. The cube compressive strength of recycled steel fiber ultra-high performance concrete can reach 140 MPa, and the tensile strength can reach 8 - 10 MPa under monotonic tensile load. The permanent formwork precast with recycled steel fiber ultra-high performance concrete has greater stiffness, which can not only meet the requirements of the construction formwork during the construction stage, but also reduce the spacing of the supporting structure, optimize the construction technology of the scaffolding project, and effectively improve the construction process of the project.

[0024] The thickness of both the beam bottom formwork 1 and the beam side formwork 2 is 15 mm.

[0025] The angle steel 3 is detachably and fixedly connected to the beam bottom formwork 1 and the beam side formwork 2 through bolts, and a layer of anti-corrosion paint is sprayed on the surfaces of the angle steel 3, the beam bottom formwork 1 and the beam side formwork 2.

[0026] A concrete composite beam includes a formwork for non-removable beam of ultra-high performance concrete and post-cast concrete. The post-cast concrete is cast in the formwork for non-removable beam of ultra-high performance concrete.

[0027] The operating principle of the present utility model is described as follows:

[0028] When this application is in use, cement, mineral powder, fly ash, silica fume and sand are put into a mortar mixer and dry-mixed for about 2 minutes. Subsequently, a water reducing agent and water are added and stirred for 5 minutes to make the mortar matrix have good fluidity and cohesiveness. Finally, the recycled steel fibers are slowly added and stirred for about 5 minutes to obtain recycled steel fiber ultra-high performance concrete. When manufacturing the beam bottom formwork 1 and the beam side formwork 2, according to the design dimensions, first manufacture the wooden formwork for casting specimens, and then cast recycled steel fiber ultra-high performance concrete in it, compact and level it. After curing and removing the formwork, a recycled steel fiber ultra-high performance concrete formwork is obtained;

[0029] The non-removable beam formwork adopts the beam bottom formwork 1 and two beam side formworks 2 to form a U-shaped formwork structure in sequence with angle steels 3 and bolts. Among them, reinforcing ribs 4 are arranged on the inner wall of the beam side formwork 2, which effectively improves the interfacial bonding performance between the formwork and the post-cast concrete and ensures the integrity of the structure. Moreover, the beam bottom formwork 1 and the two beam side formworks 2 are cast separately, and finally the three sides are spliced to form the permanent formwork of the beam. The non-removable beam formwork assembled and formed by using high-strength recycled steel fiber ultra-high performance concrete single plates is simple to manufacture, convenient and fast to transport, improves the factory production efficiency and reduces the transportation cost. The recycled steel fiber ultra-high performance concrete formwork has high compressive strength and excellent crack resistance, can resist the loads and deformations during the construction stage, reduces the spacing of the scaffolding support structure. Using the recycled steel fiber ultra-high performance concrete formwork as the non-removable formwork of the concrete composite beam provides a dense and tough permanent shell protection layer for the internal structure, can effectively improve the flexural and shear bearing capacities of the structure and improve the structural durability. In addition, the beam side formwork 2 and the beam bottom formwork 1 in the non-removable beam formwork are connected by angle steels 3 and bolts, making it easy to install the formworks and the connection is tight, avoiding the use of structural glue for caulking to prevent the slurry from overflowing in the later stage.

[0030] The above is only the preferred specific embodiment of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application, according to the technical solution of this application and its application concept, makes equivalent substitutions or changes, and should be covered within the protection scope of this application.

Claims

1. An ultra-high performance concrete non-dismantling beam formwork, comprising a beam bottom formwork (1) and two beam side formworks (2), characterized in that: The two beam side formworks (2) are arranged along the length direction of both sides of the beam bottom formwork (1), and the long sides where the beam side formworks (2) and the beam bottom formwork (1) are connected are fixedly connected by angle steels (3); The inner side wall of the beam side formwork (2) is fixedly connected with a plurality of reinforcing ribs (4) at equal intervals.

2. The ultra-high performance concrete non-dismantling beam formwork according to claim 1 is characterized in that: The beam bottom formwork (1) and the beam side formwork (2) are both recycled steel fiber ultra-high performance concrete formworks, and are both cast and formed using recycled steel fiber ultra-high performance concrete.

3. The ultra-high performance concrete non-dismantling beam formwork according to claim 2 is characterized in that: The thickness of the beam bottom formwork (1) and the beam side formwork (2) are both 15 mm.

4. The ultra-high performance concrete non-dismantling beam formwork according to claim 3 is characterized in that: The angle steel (3) is detachably fixedly connected to the beam bottom formwork (1) and the beam side formwork (2) by bolts, and the surfaces of the angle steel (3), the beam bottom formwork (1) and the beam side formwork (2) are sprayed with a layer of anti-corrosion paint.

5. A concrete composite beam, characterized in that: The method comprises adopting the ultra-high performance concrete non-dismantling beam formwork and post-cast concrete as described in any one of claims 1 to 4, wherein the post-cast concrete is cast in the ultra-high performance concrete non-dismantling beam formwork.

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