Grouting splicable reinforcing rib for 3D concrete printing
By using groutable reinforcement ribs in 3D printed concrete, and using reinforcement coatings to fill the gaps between the steel bars and concrete, the problems of weakened interlayer interface strength and poor adhesion are solved, and the mechanical and durability of the structure are improved.
Patent Information
- Application Number
- CN202422486053.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-14
AI Technical Summary
The mechanical properties of existing 3D printed concrete structures are poor, especially in the weakened interlayer interface strength and poor bonding between reinforcement ribs and concrete, resulting in gaps and durability problems.
Grouting can be spliced reinforcement ribs. By injecting reinforcement coatings such as epoxy resin or flow grouting cement into the steel pipe, the gaps between the steel pipe and the concrete can be filled to enhance the bonding strength and protect the steel pipe.
The bonding strength between concrete and steel pipes is enhanced, and the mechanical properties and durability of 3D printed structures are improved.
Smart Images
Figure CN223177008U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of 3D printing concrete, in particular to a grouting splicable reinforcing bar for 3D concrete printing. Background Technique
[0002] The interlayer interface stacked layer by layer in 3D printing concrete technology is a weakened area of mechanical strength and lacks reinforcement of reinforcing bars. Therefore, the mechanical properties of 3D printed concrete structures far from meet the requirements of engineering applications. It is difficult to add prefabricated components such as large-sized steel bars (cages) during the printing process, so a reinforcing technology adapted to the 3D printing process is needed. At present, the research on the reinforcement of 3D printed concrete is still in the exploratory stage.
[0003] Although the existing technology can enhance the mechanical properties of 3D printed concrete components, there are the following problems: there is a large gap between the reinforcing bar and the concrete, and the bonding property is poor. Inserting steel bars can improve the performance, but it will increase the volume of the concrete, resulting in cracks at the bottom layer. The fluidity of 3D printed concrete is low, the interface is not dense, the gap is obvious, the bonding at the deep part of the inserted bar is slightly better, and the surface gap is large. There are still a large number of gaps after the reinforcing bar is inserted, and these gaps will cause the corrosion of the reinforcing bar and poor durability. Fibers and short and long reinforcing bar meshes are mostly parallel to the horizontal plane, do not penetrate the interlayer, and the vertical short reinforcing bars do not form continuous long reinforcing bars. The fiber direction is the same as the printing arrangement, and the enhancement effect on the weak bonding interface is not obvious. The existing strengthening technology mainly focuses on the horizontal plane, and the vertical strengthening is insufficient, resulting in poor overall mechanical properties of the structure.
[0004] Therefore, we propose a grouting splicable reinforcing bar for 3D concrete printing to solve the above problems. Content of the Utility Model
[0005] The purpose of the utility model is to provide a grouting splicable reinforcing bar for 3D concrete printing to solve the problems raised in the above background technique.
[0006] To achieve the above purpose, the utility model provides the following technical solution: a grouting splicable reinforcing bar for D concrete printing, including a steel bar tube, and connection heads are fixedly connected to both the top end and the bottom end of the steel bar tube;
[0007] The inside of the steel bar tube is provided with a cavity.
[0008] Preferably, a plurality of groups of penetration holes are opened on the surfaces of the steel bar tube and the connection heads.
[0009] Preferably, the connection heads can be directly clamped with each other, and a plurality of groups of steel bar tubes are movably and continuously clamped through the connection heads.
[0010] Preferably, injection grooves are provided at the tops of the connection heads.
[0011] Preferably, the reinforcing steel pipes are injected with strengthening coatings through the injection notches provided at the tops of the connectors.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] First, concrete adapted to the length of a single reinforcing steel pipe is printed, leaving holes adapted to the reinforcing steel pipe. At this time, strengthening coatings are injected through the injection notches provided at the tops of the connectors. The strengthening coatings can be epoxy resin or flowing grouting cement. The strengthening coatings penetrate through the penetration holes provided on the surfaces of the reinforcing steel pipes and the connectors into the voids generated between the reinforcing steel pipes and the concrete, filling the voids, enhancing the bonding strength between the concrete and the reinforcing steel pipes, protecting the reinforcing steel pipes, and enhancing the mechanical properties and durability of the 3D printed structure. Description of the Drawings
[0014] Figure 1 is a three-dimensional structural schematic diagram of the reinforcing steel pipe of the present utility model;
[0015] Figure 2 is a front-view sectional structural schematic diagram of the reinforcing steel pipe of the present utility model when installed with concrete.
[0016] In the figure: 1, reinforcing steel pipe; 2, connector; 3, penetration hole; 4, concrete. Specific Embodiments
[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.
[0018] Please refer to Figure 1-2 , the present utility model provides a technical solution: a grouting spliceable reinforcing bar for 3D concrete printing, including a reinforcing steel pipe 1. First, concrete adapted to the length of a single reinforcing steel pipe 1 is printed, leaving holes adapted to the reinforcing steel pipe 1. At this time, strengthening coatings are injected through the injection notches provided at the tops of the connectors 2. The strengthening coatings can be epoxy resin or flowing grouting cement. The strengthening coatings penetrate through the penetration holes 3 provided on the surfaces of the reinforcing steel pipes 1 and the connectors 2 into the voids generated between the reinforcing steel pipes 1 and the concrete 4, filling the voids, enhancing the bonding strength between the concrete 4 and the reinforcing steel pipes 1, and protecting the reinforcing steel pipes 1.
[0019] Please refer to Figure 1-2, after the installation of a single steel pipe 1 is completed, continue to print the concrete 4 that is adapted to the length of the steel pipe 1. Use the second steel pipe 1 to be vertically perpendicular to the upper part of the first steel pipe 1, and use the connector 2 to complete the connection between the two steel pipes 1. Repeat the above operation again to form a continuous and integral reinforcing bar.
[0020] Working principle: First, print the concrete 4 that is adapted to the length of a single steel pipe 1, leaving holes adapted to the steel pipe 1. At this time, inject the strengthening coating through the injection slots provided at the top of the connector 2. The strengthening coating can be epoxy resin or flowing grouting cement. The strengthening coating penetrates into the gap between the steel pipe 1 and the concrete 4 through the penetration holes 3 provided on the surfaces of the steel pipe 1 and the connector 2, filling the gap, improving the bonding strength between the concrete 4 and the steel pipe 1, and also protecting the steel pipe 1. After the installation of a single steel pipe 1 is completed, continue to print the concrete 4 that is adapted to the length of the steel pipe 1. Use the second steel pipe 1 to be vertically perpendicular to the upper part of the first steel pipe 1, and use the connector 2 to complete the connection between the two steel pipes 1. Repeat the above operation again to form a continuous and integral reinforcing bar, solving the problems of poor mechanical properties and poor durability.
[0021] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A grouting spliceable reinforcing bar for 3D concrete printing, comprising a steel pipe (1), characterized in that: Both the top and bottom ends of the steel pipe (1) are fixedly connected with connectors (2). The inside of the steel pipe (1) is provided with a cavity.
2. The grouting spliceable reinforcing bar for 3D concrete printing according to claim 1, characterized in that: Multiple groups of penetration holes (3) are provided on the surfaces of both the steel pipe (1) and the connectors (2).
3. The grouting spliceable reinforcing bar for 3D concrete printing according to claim 1, characterized in that: The connectors (2) can be directly clamped to each other, and multiple groups of steel pipes (1) are movably clamped through the connectors (2).
4. A grouting spliceable reinforcing bar for 3D concrete printing according to claim 1, characterized in that: Injection notches are provided at the tops of the connectors (2).
5. The grouting spliceable reinforcing bar for 3D concrete printing according to claim 4, characterized in that: Reinforcing coatings are injected into the steel pipe (1) through the injection notches provided at the tops of the connectors (2).