Prefabricated ultra-high performance concrete component and preparation method thereof

Abstract

The present invention relates to the technical field of ultra-high performance concrete components, and in particular to a prefabricated ultra-high performance concrete component and a preparation method thereof, comprising a half-column shell component and a steel skeleton structure, wherein a connecting crossbeam is arranged between the inner walls on the left and right sides of the shell component, and the steel skeleton structure comprises an embedded structure and an exposed structure, wherein the embedded structure comprises an L-shaped embedded side steel bar embedded in the inner side panels of the shell component at both ends of the crossbeam, and the L-shaped embedded side steel bars on the same side are fixedly welded by lateral connecting steel bars, and transverse connecting steel bars penetrating the crossbeam are arranged between the symmetrical L-shaped embedded side steel bars, and the exposed structure comprises a steel skeleton, and the steel skeleton consists of two sets of side frames fitted to the inner walls of the left and right side panels of the shell component and connecting rods arranged transversely between the two sets of side frames. The ultra-high performance concrete component has a stable structure, can realize the rapid installation of decorative columns, and at the same time, has excellent durability such as anti-seepage, anti-carbonization, and anti-chloride ion erosion.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-high performance concrete components, and in particular to a prefabricated ultra-high performance concrete component and a preparation method thereof. Background Art

[0002] Compared with ordinary high-performance concrete, ultra-high performance concrete (UHPC) has higher mechanical and durability properties, and its strength grade is above C100. UHPC with ultra-high strength is used for prefabricated building components, which can effectively reduce the cross-sectional size of components and the amount of steel bars used, and reduce the deadweight of the structure.

[0003] During the decoration process of a building, non-load-bearing columns usually need to be prefabricated, and most of them are prefabricated with concrete, and then installed as a whole. However, the main disadvantage is that the surface of the prefabricated parts is rough, the graininess is strong, the ornamental quality is insufficient, and it is easy to be damaged during transportation. Therefore, in order to solve the above problems, a prefabricated ultra-high performance concrete component and its preparation method are proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a prefabricated ultra-high performance concrete component and a preparation method thereof, which has good ornamental properties. The embedded structure and the exposed structure together constitute the steel skeleton structure of the shell component. The structure is stable, not easy to break or damage during transportation, and is convenient to install and disassemble. It is suitable for the rapid installation of decorative columns. At the same time, it has excellent durability such as impermeability, carbonization resistance, and chloride ion corrosion resistance, and the surface is fine and smooth, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A prefabricated ultra-high performance concrete component, comprising:

[0007] A half-cylindrical case member, wherein connecting beams are arranged between the inner walls on the left and right sides of the case member, and the connecting beams are arranged at equal intervals;

[0008] Steel skeleton structure, the steel skeleton structure includes an embedded structure and an exposed structure, the embedded structure includes L-shaped embedded side steel bars embedded in the side plates of the shell components at both ends of the beam, and the L-shaped embedded side steel bars on the same side are fixed and welded by lateral connecting steel bars, and transverse connecting steel bars passing through the beam are arranged between the symmetrical L-shaped embedded side steel bars, and the exposed structure includes a steel skeleton, the steel skeleton is composed of two groups of side frames that fit the inner walls of the left and right side panels of the shell components and connecting rods arranged transversely between the two groups of side frames, and the inwardly bent rods at the bottom of the L-shaped embedded side steel bars pass through the side frames and are fixed to the side frames by fixing nuts.

[0009] As a preferred solution, a mounting angle iron is fixedly provided at the bottom of the inner panel of the side frame, and screw holes are provided on the mounting angle iron. The mounting angle irons on the side frame are arranged at equal distances.

[0010] As a preferred solution, the ultra-high performance concrete includes, by weight, 120-140 parts of fine aggregate, 60-80 parts of cement, 30-40 parts of fly ash, 5-15 parts of fiber, 2-5 parts of additives, and 40-50 parts of water.

[0011] As a preferred solution, the fine aggregate includes buoyant beads and quartz sand, the ratio of the buoyant beads to the quartz sand is 1-1.5:1, and the particle size of the buoyant beads is 10-100 μm.

[0012] As a preferred solution, the cement is ordinary Portland cement with a P.O.52.5.

[0013] As a preferred solution, the fiber is specifically copper-plated steel fiber with a diameter of 0.22 mm, a length of 13 mm, and a compressive strength of ≥3000 MPa.

[0014] As a preferred embodiment, the additives include water reducer, defoamer and shrinkage reducer, the amount of water reducer added is 20%-35% of the amount of additives added, the amount of defoamer added is 10%-25% of the amount of additives added, the amount of shrinkage reducer added is 30%-45% of the amount of additives added, the water reducer is a polycarboxylic acid water reducer, the defoamer includes one or more of polyether defoamer, silicone defoamer and polyether modified silicone defoamer, and the shrinkage reducer includes one or more of polyol shrinkage reducer and polyether shrinkage reducer.

[0015] A method for preparing a prefabricated ultra-high performance concrete component comprises the following steps:

[0016] S1. Making a mold: Making a mold according to the appearance of the watch case component. The mold includes an outer mold and an inner mold. The inner wall of the outer mold is made into a special-shaped surface according to the requirements. The inner mold is provided with a casting groove corresponding to the position of the connecting beam, and mold release oil is applied to the inner wall of the mold;

[0017] S2. Arrange a steel skeleton structure in the mold. Specifically, weld the lateral connecting steel bars and the transverse connecting steel bars in the embedded structure to the L-shaped embedded side steel bars, then place the steel bar structure in the outer mold, hang the steel bar structure in the outer mold by iron wire, and cover the inner mold.

[0018] S3, preparation of ultra-high performance concrete: quantitatively weigh 120-140 parts of fine aggregate, 60-80 parts of cement, 30-40 parts of fly ash, 5-15 parts of fiber, and 2-5 parts of additives, fully mix them using a concrete mixer, add 40-50 parts of water, and stir the ultra-high performance concrete to obtain an ultra-high performance concrete material;

[0019] S4. Fill the prepared ultra-high performance concrete material into the mold. During this process, use a vibrating rod or other tools to vibrate out the air in the material so that the ultra-high performance concrete is fully and evenly filled into every corner of the mold. After solidification and curing, an ultra-high performance concrete component is obtained.

[0020] It can be seen from the technical solution provided by the present invention that the prefabricated ultra-high performance concrete component and the preparation method thereof provided by the present invention have the following beneficial effects:

[0021] 1. A steel skeleton structure is set inside the case member, and the steel skeleton structure includes an embedded structure and an exposed structure. The embedded structure includes L-shaped embedded side steel bars embedded inside the side plates of the case member at both ends of the beam, and the L-shaped embedded side steel bars on the same side are fixed and welded by lateral connecting steel bars, and transverse connecting steel bars that penetrate the beam are set between the symmetrical L-shaped embedded side steel bars. After the casting of the case member is completed, the exposed structure is installed on the embedded structure. The case member can be directly used as a column and has good ornamental value. The embedded structure and the exposed structure together constitute the steel skeleton structure of the case member, which has a stable structure, is not easy to break or damage during transportation, is easy to install and disassemble, and is suitable for the rapid installation of decorative columns;

[0022] 2. By using fine aggregate, cement, fly ash, fiber, additives and water as raw materials for ultra-high performance concrete, among which fine aggregate serves as the skeleton structure of ultra-high performance concrete. Fine aggregate includes buoyant beads and quartz sand. The buoyant beads have the characteristics of light weight and high refractoriness, and are hollow inside. After the internal water flows out, the cement can fully react and the strength of the prefabricated ultra-high performance concrete components can be enhanced. The manufactured prefabricated ultra-high performance concrete components have excellent durability such as impermeability, carbonization resistance, and chloride ion corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a prefabricated ultra-high performance concrete component and a preparation method thereof according to the present invention;

[0024] Figure 2 It is a schematic diagram of the steel skeleton structure in the present invention.

[0025] In the figure: 1. Case member; 11. Connecting beam; 2. Steel frame; 21. Side frame; 22. Connecting rod; 23. Mounting angle iron; 3. L-shaped embedded side reinforcement; 32. Fixing nut; 33. Lateral connecting reinforcement; 34. Transverse connecting reinforcement. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] like Figure 1-2 As shown, an embodiment of the present invention provides a prefabricated ultra-high performance concrete component, including a half-column shell component 1 and a steel skeleton structure, a connecting crossbeam 11 is arranged between the inner walls on the left and right sides of the shell component 1, and the connecting crossbeams 11 are arranged at equal intervals, the steel skeleton structure includes an embedded structure and an exposed structure, the embedded structure includes L-shaped embedded side steel bars 3 embedded in the side panels of the shell component 1 at both ends of the crossbeam 11, and the L-shaped embedded side steel bars 3 on the same side are fixedly welded by lateral connecting steel bars 33, and transverse connecting steel bars 34 passing through the crossbeam 11 are arranged between the symmetrical L-shaped embedded side steel bars 3, and the exposed structure includes a steel skeleton 2, the steel skeleton 2 is composed of two groups of side frames 21 attached to the inner walls of the left and right side panels of the shell component 1 and connecting rods 22 arranged transversely between the two groups of side frames 21, and the rod member bent inward at the bottom of the L-shaped embedded side steel bar 3 passes through the side frame 21 and is fixedly installed with the side frame 21 by a fixing nut 32;

[0029] Furthermore, the outer surface of the case member 1 can be made into a special-shaped surface according to needs to improve the ornamental value of the column. The case member 1 can be spliced ​​into a complete column in two groups, or it can be set against the wall.

[0030] See also Figure 2 A mounting angle iron 23 is fixedly provided at the bottom of the inner panel of the side frame 21, and screw holes are provided on the mounting angle iron 23. The mounting angle irons 23 on the side frame 21 are arranged at equal distances, and the mounting angle irons 23 are used for the installation of the case component 1 and the wall or the other half of the case component 1.

[0031] In this embodiment, the ultra-high performance concrete includes, by weight, 120-140 parts of fine aggregate, 60-80 parts of cement, 30-40 parts of fly ash, 5-15 parts of fiber, 2-5 parts of additives, and 40-50 parts of water. The fine aggregate includes buoyant beads and quartz sand. The ratio of buoyant beads to quartz sand is 1-1.5:1. The particle size of the buoyant beads is 10-100 μm. The cement is ordinary silicate cement with a P.O.52.5. The fiber is specifically a copper-plated steel fiber with a diameter of 0.22 mm and a length of 1. 3mm, compressive strength ≥3000MPa, added additives include water reducer, defoamer and shrinkage reducer, the added amount of water reducer is 20%-35% of the amount of added additives, the added amount of defoamer is 10%-25% of the amount of added additives, the added amount of shrinkage reducer is 30%-45% of the amount of added additives, the water reducer is a polycarboxylic acid water reducer, the defoamer includes one or more of polyether defoamer, silicone defoamer and polyether modified silicone defoamer, and the shrinkage reducer includes one or more of polyol shrinkage reducer and polyether shrinkage reducer.

[0032] A method for preparing a prefabricated ultra-high performance concrete component comprises the following steps:

[0033] S1. Making a mold: Making a mold according to the appearance of the watch case component. The mold includes an outer mold and an inner mold. The inner wall of the outer mold is made into a special-shaped surface according to the requirements. The inner mold is provided with a casting groove corresponding to the position of the connecting beam, and mold release oil is applied to the inner wall of the mold;

[0034] S2. Arrange a steel skeleton structure in the mold. Specifically, weld the lateral connecting steel bars and the transverse connecting steel bars in the embedded structure to the L-shaped embedded side steel bars, then place the steel bar structure in the outer mold, hang the steel bar structure in the outer mold by iron wire, and cover the inner mold.

[0035] S3, preparation of ultra-high performance concrete: quantitatively weigh 120-140 parts of fine aggregate, 60-80 parts of cement, 30-40 parts of fly ash, 5-15 parts of fiber, and 2-5 parts of additives, fully mix them using a concrete mixer, add 40-50 parts of water, and stir the ultra-high performance concrete to obtain an ultra-high performance concrete material;

[0036] S4. Fill the prepared ultra-high performance concrete material into the mold. During this process, use a vibrating rod or other tools to vibrate out the air in the material so that the ultra-high performance concrete is fully and evenly filled into every corner of the mold. After solidification and curing, an ultra-high performance concrete component is obtained.

[0037] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

[0038] Making mold: Make the mold according to the shape of the case component and apply mold release oil on the inner wall of the mold;

[0039] A steel skeleton structure is arranged in the mold, and the steel skeleton structure is suspended in the mold by iron wires;

[0040] 130 parts of fine aggregate, 75 parts of cement, 30 parts of fly ash, 5 parts of fiber, and 5 parts of additives were quantitatively weighed, fully mixed using a concrete mixer for 5 minutes, 50 parts of water were added, and ultra-high performance concrete was stirred for 15 minutes to obtain an ultra-high performance concrete material.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prefabricated ultra-high performance concrete component, characterized in that: include: A half-cylindrical case member (1), wherein connecting crossbeams (11) are arranged between left and right inner walls of the case member (1), and the connecting crossbeams (11) are arranged at equal intervals; A steel skeleton structure, the steel skeleton structure comprising an embedded structure and an exposed structure, the embedded structure comprising L-shaped embedded side steel bars (3) embedded in the side panels of the case member (1) at both ends of the crossbeam (11), the L-shaped embedded side steel bars (3) on the same side being fixedly welded by lateral connecting steel bars (33), and transverse connecting steel bars (34) penetrating the crossbeam (11) being arranged between the symmetrical L-shaped embedded side steel bars (3), the exposed structure comprising a steel skeleton (2), the steel skeleton (2) comprising two groups of side frames (21) fitted to the inner walls of the left and right side panels of the case member (1) and connecting rods (22) transversely arranged between the two groups of side frames (21), the rod member bent inwardly at the bottom of the L-shaped embedded side steel bars (3) penetrating the side frames (21) and being fixedly mounted to the side frames (21) by fixing nuts (32); The bottom of the inner panel of the side frame (21) is fixedly provided with a mounting angle iron (23), and the mounting angle iron (23) is provided with screw holes, and the mounting angle irons (23) on the side frame (21) are arranged at equal distances; the ultra-high performance concrete comprises, by weight, 120-140 parts of fine aggregate, 60-80 parts of cement, 30-40 parts of fly ash, 5-15 parts of fiber, 2-5 parts of additives, and 40-50 parts of water; the fine aggregate comprises floating beads and quartz sand, the ratio of the floating beads to the quartz sand is 1-1.5:1, and the particle size of the floating beads is 10-100 μm; the cement is ordinary silica with a P.O.52.5 acid cement; the fiber is specifically copper-plated steel fiber, with a diameter of 0.22mm, a length of 13mm, and a compressive strength of ≥3000MPa; the additives include a water reducer, a defoamer and a shrinkage reducer, the amount of the water reducer added is 20%-35% of the amount of the additives added, the amount of the defoamer added is 10%-25% of the amount of the additives added, and the amount of the shrinkage reducer added is 30%-45% of the amount of the additives added, the water reducer is a polycarboxylic acid-based water reducer, the defoamer includes one or more of a polyether defoamer, a silicone defoamer and a polyether-modified silicone defoamer, and the shrinkage reducer includes one or more of a polyol shrinkage reducer and a polyether shrinkage reducer.

2. The method for preparing the prefabricated ultra-high performance concrete component according to claim 1, characterized in that: The steps include: S1. Making a mold: Making a mold according to the appearance of the watch case component. The mold includes an outer mold and an inner mold. The inner wall of the outer mold is made into a special-shaped surface according to the requirements. The inner mold is provided with a casting groove corresponding to the position of the connecting beam, and mold release oil is applied to the inner wall of the mold; S2. A steel skeleton structure is arranged in the mold. Specifically, the lateral connecting steel bars and the transverse connecting steel bars in the embedded structure are welded to the L-shaped embedded side steel bars, and then the steel bar structure is placed in the outer mold. The steel bar structure is suspended in the outer mold by iron wires and covered with the inner mold. S3, preparation of ultra-high performance concrete: quantitatively weigh 120-140 parts of fine aggregate, 60-80 parts of cement, 30-40 parts of fly ash, 5-15 parts of fiber, and 2-5 parts of additives, fully mix them using a concrete mixer, add 40-50 parts of water, and stir the ultra-high performance concrete to obtain an ultra-high performance concrete material; S4. Fill the prepared ultra-high performance concrete material into the mold. During this process, use a vibrating rod to vibrate out the air in the material so that the ultra-high performance concrete is fully and evenly filled into every corner of the mold. After solidification and curing, the ultra-high performance concrete component is obtained.

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