CN115056311A - Reinforcing rib preparation method for reinforced concrete structure and 3D printing system - Google Patents
Reinforcing rib preparation method for reinforced concrete structure and 3D printing system Download PDFInfo
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- CN115056311A CN115056311A CN202210649075.7A CN202210649075A CN115056311A CN 115056311 A CN115056311 A CN 115056311A CN 202210649075 A CN202210649075 A CN 202210649075A CN 115056311 A CN115056311 A CN 115056311A
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- concrete structure
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 78
- 238000010146 3D printing Methods 0.000 title claims abstract description 47
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title description 3
- 238000002347 injection Methods 0.000 claims abstract description 49
- 239000007924 injection Substances 0.000 claims abstract description 49
- 239000004567 concrete Substances 0.000 claims abstract description 48
- 238000007639 printing Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000012779 reinforcing material Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 7
- 230000007246 mechanism Effects 0.000 claims description 56
- 238000001125 extrusion Methods 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000011376 self-consolidating concrete Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 6
- 239000002002 slurry Substances 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 description 11
- 239000000835 fiber Substances 0.000 description 7
- 210000000038 chest Anatomy 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 210000003205 muscle Anatomy 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000019219 chocolate Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
Abstract
The invention discloses a method for preparing a reinforcing rib for a reinforced concrete structure and a 3D printing system, and relates to the technical field of 3D printing. According to the method for preparing the reinforcing rib for reinforcing the concrete structure and the 3D printing system, the reinforcing material in a fluid state is injected in the state that the base material is not solidified, so that the gap defect caused in the printing and reinforcing processes can be fully repaired in the liquid injection process, and the gap introduced by other reinforcing technologies can be completely eradicated; the reinforcing ribs with different sizes and different directions can be realized, and the reinforcing ribs have the same effect with the prior technologies of thread embedding, reinforcing steel bar placement, vertical insertion of reinforcing steel bars/steel nails and the like. The horizontal/vertical ribs can be spliced with the ribs in the concrete slurry, a reinforcing rib network can be formed, and the mechanical property of the 3D printed concrete structure is effectively enhanced.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a method for preparing a reinforcing rib for reinforcing a concrete structure and a 3D printing system.
Background
The 3D printing concrete technology has accurate dosage control, can effectively save the dosage of concrete, reduce the carbon emission caused by the production of concrete raw materials, and bring good economic benefit and improvement on ecological environment for the construction industry. The interlayer interface stacked layer by layer in the 3D printing concrete technology is a weakened area of mechanical strength and lacks reinforcement of a rib material, so that the mechanical property of the 3D printing concrete structure far does not meet the engineering application requirement. However, it is difficult to add a preform such as a large-sized steel bar (cage) during the printing process, so a reinforcement technology that is compatible with the 3D printing process is required. At present, the 3D printed concrete reinforcement research is still in the exploration phase, and the prior art can improve the mechanical properties of 3D printed concrete members, but also has the following problems:
1. the gap between the reinforcing rib and the concrete interface is serious. Although the mechanical property can be effectively improved by inserting the reinforcing steel bars, the printed concrete can be expanded by inserting and placing operation, the primarily cured concrete at the bottom layer is easy to crack, and the interface between the reinforcing steel bars and the concrete is not compact and has larger gaps due to the combination of the low fluidity of the concrete, so that the reinforcing steel bars and the concrete have poor bonding and larger gap deterioration. Generally, the deeper portions of the bars are bonded slightly better and the voids at the surface are very large. For thin bars, such as nails, to be inserted into the concrete slurry, a large amount of voids also appear around the reinforcing bars.
2. Insufficient mechanical property enhancement and lack of vertical reinforcing ribs. The concrete structure prepared by 3D printing has the obvious layering characteristic and has anisotropy in mechanical property. The mechanical reinforcement achieved by these techniques, such as fiber incorporation, long fiber embedding, or horizontal placement of reinforcing bars, is all in the horizontal plane, and therefore only the mechanical properties of the horizontal plane can be improved. The directly stirred fibers and the long and short rib nets placed during printing are parallel to the horizontal plane, and do not vertically penetrate through the printed interlayer interface, and the vertically inserted short ribs cannot form continuous long ribs. The direction of the doped fibers is the same as the printing arrangement direction, and the fibers only exist in the extrusion lines and cannot penetrate through the interface generated by printing. The direct fiber agitation approach is therefore not significant for the weakly bonded interface enhancement produced by the 3D printing process. Particularly, the vertical interlayer interface is not obviously improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for preparing a reinforcing rib for reinforcing a concrete structure and a 3D printing system, so as to improve the bonding strength between the reinforcing rib and a base material and improve the mechanical property of the whole mechanism.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for preparing a reinforcing rib for reinforcing a concrete structure, wherein in the 3D printing process, a reinforcing material is injected into an unset 3D printing material and is hardened into the reinforcing rib; and the reinforcing ribs are spliced with the ribs in the concrete.
Optionally, the injection direction of the reinforcing material is the same as the moving direction of the 3D printing nozzle.
Optionally, the injection direction of the reinforcing material is perpendicular to the moving direction of the 3D printing nozzle.
The injection direction of the reinforcing material and the moving direction of the 3D printing nozzle form a certain angle
Optionally, the invention further discloses a 3D printing system for reinforcing ribs of a reinforced concrete structure, which comprises a printing nozzle, a rib injection extrusion mechanism and a casting pipeline; the printing nozzle is a printing head of the 3D printer, the injection rib extrusion mechanism is arranged on one side of the printing nozzle, one end of the injection pipeline is communicated with a discharge hole of the injection rib extrusion mechanism, and the other end of the injection pipeline extends to the lower side of the printing nozzle.
Optionally, the device further comprises a vertical moving mechanism, the vertical moving mechanism is connected with the printing nozzle, the rib injection extruding mechanism is connected with the movable end of the vertical moving mechanism, and the vertical moving mechanism is used for enabling the rib injection extruding mechanism to vertically move.
Optionally, the vertical moving mechanism comprises a linear module, the fixed end of the linear module is connected with the printing nozzle, and the movable end of the linear module is connected with the rib injection extruding mechanism.
Optionally, the other end of the pouring pipeline extends to one side of the printing nozzle, which is far away from the rib-injection extruding mechanism.
Optionally, the reinforcing material for injecting the reinforcement in the reinforcement injection extrusion mechanism is self-compacting concrete or epoxy resin or melted plastic.
Compared with the prior art, the invention has the following technical effects:
according to the method for preparing the reinforcing rib for reinforcing the concrete structure and the 3D printing system, the reinforcing material in a fluid state is injected in the state that the base material is not solidified, so that the gap defect caused in the printing and reinforcing processes can be fully repaired in the liquid injection process, and the gap introduced by other reinforcing technologies can be completely eradicated; the horizontal or vertical reinforcing ribs with different sizes can be realized, and the horizontal or vertical reinforcing ribs have the same effect with the existing multiple technologies of thread embedding, steel bar placing, vertical steel bar/steel nail inserting and the like. The short ribs can be spliced horizontally/vertically in concrete slurry, a reinforcing rib network can be formed, and the mechanical property of the 3D printed concrete structure is enhanced more effectively.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of a horizontal direction rebar injection of a 3D printing system for reinforcing steel bars of a concrete structure according to the present invention;
FIG. 2 is a schematic diagram of a vertical rebar injection structure of the 3D printing system for reinforcing steel bars of a concrete structure according to the invention;
FIG. 3 is a schematic structural diagram illustrating a reinforcing rib cage manufacturing process of the 3D printing system for reinforcing ribs of a reinforced concrete structure according to the present invention;
fig. 4 is a schematic view of a first horizontal direction rebar injection distribution of the 3D printing system for reinforcing steel bars of a concrete structure according to the present invention;
fig. 5 is a schematic view of a second horizontal direction rebar injection distribution of the 3D printing system for reinforcing steel bars of a concrete structure according to the present invention;
fig. 6 is a schematic view of a third horizontal direction rebar injection distribution of the 3D printing system for reinforcing steel bars of a concrete structure according to the present invention;
FIG. 7 is a schematic diagram of the reinforcement cage reinforcement injection distribution of the 3D printing system for reinforcing bars of a reinforced concrete structure according to the present invention;
fig. 8 is a schematic structural view of an oblique reinforcement injection of the 3D printing system for reinforcing bars of a concrete structure according to the present invention.
Description of reference numerals: 1. printing a spray head; 2. a transverse rib injection extruding mechanism; 3. pouring a pipeline; 4. a substrate; 5. horizontal reinforcing ribs; 6. a vertical reinforcing rib; 7. a vertical bar injection extrusion mechanism; 8. a linear module; 9. an oblique rib injection extrusion mechanism; 10. an angle adjusting mechanism; 11. and (5) oblique reinforcing ribs.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 4 to 7, the present embodiment provides a reinforcing bar manufacturing method for reinforcing a concrete structure, in which a reinforcing material is injected into an unset 3D printed material and the reinforcing material is hardened into a reinforcing bar during 3D printing. The injection direction of the reinforcing material is the same as the moving direction of the 3D printing nozzle 1 to form a horizontal reinforcing rib 5, or the injection direction of the reinforcing material is vertical to the moving direction of the 3D printing nozzle 1 to form a vertical reinforcing rib 6, and the horizontal reinforcing rib 5 and the vertical reinforcing rib 6 can also be arranged to form a reinforcing rib cage.
The distribution of the reinforcing ribs can adopt a fiber short rib reinforced concrete mode similar to the traditional mode, but has digitalization: through the pre-simulation calculation, under different structure application scenes, different ribs are distributed at stress points with different structures, the distribution of the optimized ribs can be controlled, less ribs are used, and the same mechanical property is realized, as shown in fig. 4 to 6. By performing simulation optimization in the drawing, the parameters of the reinforcing ribs can be optimized, fewer reinforcing ribs are used, the same mechanical enhancement effect is realized, and the printing preparation time and the consumption of the reinforcing ribs are saved.
And (4) preparing a reinforcing rib cage in the concrete by splicing the prepared reinforcing ribs. The prepared bar integrally strengthens the mechanical property of the concrete structure, as shown in figure 7. Through simulation optimization, parameters of the rib cage are optimized and improved, and the using amount of ribs can be saved. Through simulation optimization, parameters of the rib cage are optimized and improved, and printing and preparing time can be saved.
The second embodiment:
as shown in fig. 1 to 3, the present embodiment discloses a 3D printing system for reinforcing bars of a reinforced concrete structure, which includes a printing nozzle 1, a bar injection extrusion mechanism, and a casting pipe 3; print shower nozzle 1 and be the printer head that beats of 3D printer, annotate muscle extrusion mechanism and set up in the one side of printing shower nozzle 1, annotate 3 one end of watering pipeline and be linked together with annotate muscle extrusion mechanism's discharge gate, annotate 3 other ends of watering pipeline and extend to the below of printing shower nozzle 1.
In a more specific embodiment, the 3D printing system for reinforcing ribs of a concrete structure further comprises a vertical moving mechanism, the vertical moving mechanism is connected to the printing head 1, the rib injection extruding mechanism is connected to a movable end of the vertical moving mechanism, and the vertical moving mechanism is configured to vertically move the rib injection extruding mechanism.
Vertical moving mechanism includes sharp module 8, and the stiff end of sharp module 8 is connected with print the shower nozzle 1, and the expansion end of sharp module 8 is connected with notes muscle extruding means. The other end of the pouring pipeline 3 extends to one side of the printing nozzle 1 far away from the rib-injecting extruding mechanism. The reinforcing material for injecting the ribs in the rib injection extruding mechanism is an inorganic material or an organic material.
The horizontal rib injection extruding mechanism 2 and the vertical rib injection extruding mechanism 7 respectively inject a horizontal reinforcing rib 5 and a vertical reinforcing rib 6 to form a reinforcing cage.
Example three:
as shown in fig. 8, the present embodiment discloses a 3D printing system for reinforcing bars of a reinforced concrete structure, wherein a printing nozzle 1 is connected to a housing of an angle adjusting mechanism 10, a movable head of the angle adjusting mechanism 10 is connected to a linear module 8, an angle of the linear module 8 is adjusted by the angle adjusting mechanism 10, a movable end of the linear module 8 is connected to an oblique bar-injecting extruding mechanism 9, and during printing, a height and an angle of the oblique bar-injecting extruding mechanism 9 are adjusted by the linear module 8 and the angle adjusting mechanism 10 to inject an oblique reinforcing bar 11.
The angle adjusting mechanism 10 comprises a motor and a speed reducer, the motor is in transmission connection with the speed reducer, a shell of the speed reducer is connected with the printing nozzle 1, the linear module 8 is connected with an output end of the speed reducer, the printing nozzle 1 and the angle adjusting mechanism 10 can move synchronously, the motor drives the speed reducer to drive the linear module 8 to rotate and position, angle adjustment of the linear module 8 is achieved, and the inclined reinforcing rib 11 with a set angle is printed.
The reinforcing material for injecting the reinforcing bars in the bar injection extruding mechanism is self-compacting concrete or melted plastics, can also adopt resin, and can also be used in other industries for injecting clay or chocolate and the like.
The reinforcing ribs used in the concrete are injected in a slurry state, are in a liquid state in the initial stage and then become solid reinforcing ribs, and because the reinforcing ribs are still in a liquid state within a period of time (10 minutes to several hours) after being injected into the concrete slurry, the reinforcing ribs can be continuously formed after being solidified by connecting liquid materials in the concrete slurry or form a reinforcing rib cage, so that the performance of the 3D printed concrete structure is integrally enhanced.
The invention can adopt one 3D printing nozzle 1 and one rib injection extruding mechanism, can also adopt one 3D printing nozzle 1 and a plurality of rib injection extruding mechanisms, can realize different reinforcement parameters, and can also adopt a plurality of concrete nozzles and a plurality of reinforcement nozzles to realize the rapid printing of concrete.
The reinforcing material is injected by a suction tube. That is, the pouring pipe 3 is inserted into the concrete, and during the movement of the pouring pipe 3, the liquid reinforcing material is injected, and the liquid reinforcing material fills the space reserved in the pouring pipe 3, so that the extrusion printing process performed in the concrete can be regarded as a process which is substantially different from the existing stack printing.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. The method for preparing the reinforcing rib for reinforcing the concrete structure is characterized in that in the 3D printing process, a reinforcing material is injected into an unset 3D printing material, and the reinforcing material is hardened into the reinforcing rib; and the reinforcing ribs are spliced with the ribs in the concrete.
2. The method for preparing a reinforcing bar for a reinforced concrete structure according to claim 1, wherein the reinforcing material is injected in the same direction as the moving direction of the 3D printing nozzle.
3. The method of preparing reinforcing bar for reinforced concrete structure according to claim 1, wherein the injection direction of the reinforcing material is perpendicular to the moving direction of the 3D printing nozzle.
4. The method of preparing reinforcing bar for reinforced concrete structure of claim 1, wherein the injection direction of the reinforcing material is at an angle to the moving direction of the 3D printing nozzle.
5. The 3D printing system for reinforcing ribs of reinforced concrete structures is characterized by comprising a printing nozzle, a rib injection extrusion mechanism and a casting pipeline; the printing nozzle is a printing head of the 3D printer, the injection rib extrusion mechanism is arranged on one side of the printing nozzle, one end of the injection pipeline is communicated with a discharge hole of the injection rib extrusion mechanism, and the other end of the injection pipeline extends to the lower side of the printing nozzle.
6. The 3D printing system for reinforcing ribs of a concrete structure according to claim 5, further comprising a vertical moving mechanism, wherein the vertical moving mechanism is connected with the printing nozzle, the rib injection extruding mechanism is connected with a movable end of the vertical moving mechanism, and the vertical moving mechanism is used for enabling the rib injection extruding mechanism to move vertically.
7. The 3D printing system for reinforcing ribs of a concrete structure according to claim 6, wherein the vertical moving mechanism comprises a linear module, a fixed end of the linear module is connected with the printing nozzle, and a movable end of the linear module is connected with the rib injection extruding mechanism.
8. The 3D printing system for reinforcing bars for concrete structures as claimed in claim 5, wherein the other end of the pouring pipe extends to the side of the printing nozzle away from the bar-injection extruding mechanism.
9. The 3D printing system for reinforcing bars for reinforced concrete structures according to claim 5, wherein the reinforcing material for the injection of the bars in the bar injection extrusion mechanism is self-compacting concrete or epoxy resin or melted plastic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210649075.7A CN115056311A (en) | 2022-06-09 | 2022-06-09 | Reinforcing rib preparation method for reinforced concrete structure and 3D printing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210649075.7A CN115056311A (en) | 2022-06-09 | 2022-06-09 | Reinforcing rib preparation method for reinforced concrete structure and 3D printing system |
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Cited By (1)
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| CN115929038A (en) * | 2022-10-11 | 2023-04-07 | 深圳大学 | In-situ continuous reinforcement method for 3D printed concrete structure |
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