CN113309290A - Novel 3D prints coincide roof beam system - Google Patents
Novel 3D prints coincide roof beam system Download PDFInfo
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- CN113309290A CN113309290A CN202010464747.8A CN202010464747A CN113309290A CN 113309290 A CN113309290 A CN 113309290A CN 202010464747 A CN202010464747 A CN 202010464747A CN 113309290 A CN113309290 A CN 113309290A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00181—Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a novel 3D printing superposed beam system, which comprises: the U-shaped 3D printing prefabrication part of the superposed beam; a cast-in-place part; prefabricated part's grub bar, construction grub bar, stirrup, construction stirrup and hang muscle. The prefabricated part is formed by printing by adopting a 3D printing technology and an ultrahigh-ductility cement-based composite material, wherein the ultrahigh-ductility cement-based composite material comprises the following components in parts by mass: 10-30 parts of cement, 30-55 parts of fly ash, 0.01-5 parts of silica fume, 15-30 parts of sand, 0.1-10 parts of nickel slag sand, 0.1-10 parts of limestone powder, 8-25 parts of water, 0.05-0.5 part of polycarboxylic acid high-performance water reducing agent, 0.5-2 parts of polyethylene fiber, 0-0.02 part of cellulose ether, 0-0.01 part of rubber cement and 0-0.1 part of nano silicon dioxide, wherein the cast-in-place part is C30-C60 common concrete. The invention greatly simplifies the prefabrication production process of the composite beam, flexibly adapts to the form and the size of the component, fully utilizes the material characteristics, ensures that the composite beam has good integrity, improves the stress performance, can control the cost, and has good economic benefit, environmental benefit and social benefit.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a novel 3D printing prefabricated superposed beam system.
Background
Composite beams are a more common form of prefabricated component in fabricated buildings. In the production process, the process flow of the composite beam is complex, and the composite beam is generally divided into two times of concrete pouring, wherein the first time is to make the prefabricated beam in a prefabricated part factory, and the second time is to connect the prefabricated composite beam with upper cast-in-place concrete into a whole after the prefabricated composite beam is hoisted on a construction site. In the prefabrication stage of a component factory, the manufacture of the superposed beam puts higher requirements on the manufacture and support engineering of the template, and the complexity of the process is further improved.
The 3D printing concrete technology is rapidly raised in recent years, which provides a new idea for the production process of concrete products. The technology greatly simplifies the concrete forming process, has no template supporting requirement, does not need vibration, and realizes automatic pouring forming, so that the requirement of the production of concrete on manpower is further reduced.
Cracking is an important factor influencing the mechanical property and durability of concrete, and is one of the main problems restricting the technical development of 3D printing concrete at present. The advent of ultra-high ductility cement-based composites has provided a way to solve this problem. Ultra-high ductility cement-based composites have evolved rapidly over the past thirty years and are now gradually forming mature material systems. The ultra-high ductility cement-based composite material can greatly improve the strain limit of concrete under the tensile action. When the concrete cracks, the ECC can generate a large number of cracks rather than a single crack under the same deformation degree, so that the opening width of the single crack is greatly reduced, and the durability of the concrete is effectively improved. But generally speaking, ECC materials tend to cost more than ordinary concrete materials.
The invention utilizes the 3D printing technology to prepare the prefabricated part of the superposed beam, solves the problems of complicated template engineering and low production efficiency of the prefabricated part of the superposed beam, and provides a high-efficiency, quick and low-cost prefabricated production process of the superposed beam; meanwhile, the ECC is used as a 3D printing material for the prefabricated part of the composite beam, so that the stress performance and the durability of the composite beam are effectively improved.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a novel 3D printing superposed beam system capable of avoiding dirt, improving the production efficiency, reducing the production cost, preventing cracking and prolonging the durability.
The invention provides a novel 3D printing superposed beam system, which is characterized in that: comprises that
A U-shaped 3D printing prefabricated part (1) of the superposed beam;
a cast-in-place part (2) of the composite beam;
3D printing studs (3) of the prefabricated part in a U-shaped mode of the superposed beam;
3D printing the construction studs (4) of the prefabricated part of the U-shaped superposed beam;
a stirrup (5) of a U-shaped 3D printing prefabricated part of the superposed beam;
3D printing a construction stirrup (6) of a prefabricated part of the U-shaped laminated beam;
3D printing hanging ribs (7) of the prefabricated part of the U-shaped superposed beam;
the U-shaped 3D printing prefabricated part of the superposed beam and the cast-in-place part of the superposed beam are poured together;
the stud (3) of the U-shaped 3D printing prefabricated part of the superposed beam is arranged in the bottom of the U-shaped 3D printing prefabricated part (1) of the superposed beam;
the construction studs (4) of the U-shaped 3D printing prefabricated part of the superposed beam are arranged on two wings of the U-shaped 3D printing prefabricated part (1) of the superposed beam;
hooping (5) of the U-shaped 3D printing prefabricated part of the superposed beam hoops the U-shaped 3D printing prefabricated part (1) of the superposed beam;
the construction stirrups (6) of the U-shaped 3D printing prefabricated part of the superposed beam hoop the U-shaped 3D printing prefabricated part (1) of the superposed beam;
the hanging ribs (7) of the U-shaped 3D printing prefabricated part of the superposed beam are vertically arranged on the outer surface of the construction vertical rib (4) of the U-shaped 3D printing prefabricated part of the superposed beam, and two hanging ribs (7) of the U-shaped 3D printing prefabricated part of the superposed beam are respectively arranged at two wings of the U-shaped 3D printing prefabricated part (1) of the superposed beam.
Furthermore, the U-shaped 3D printing prefabricated part of the composite beam and the cast-in-place part of the composite beam are cast through concrete to form a whole.
Furthermore, the studs (3) of the U-shaped 3D printing prefabricated part of the composite beam are uniformly distributed in the bottom of the U-shaped 3D printing prefabricated part (1) of the composite beam.
Further, the hooping (5) of the U-shaped 3D printing prefabricated part of the superposed beam hoops the U-shaped 3D printing prefabricated part (1) of the superposed beam longitudinally from the outer surface of the bottom of the vertical rib (3) of the U-shaped 3D printing prefabricated part of the superposed beam.
Further, the construction stirrup (6) of the U-shaped 3D printing prefabricated part of the superposed beam transversely hoops the U-shaped 3D printing prefabricated part (1) of the superposed beam from the outer surface of the construction stirrup (4) of the U-shaped 3D printing prefabricated part of the superposed beam.
Furthermore, the U-shaped 3D printing prefabricated part (1) of the superposed beam is formed by printing through a 3D concrete printing technology, the outer surface of the U-shaped 3D printing prefabricated part (1) of the superposed beam is a flat surface, and the inner surface of the U-shaped 3D printing prefabricated part is a rough surface.
Furthermore, the U-shaped 3D printing prefabricated part (1) of the composite beam is made of an ultrahigh-ductility cement-based composite material, and the cast-in-place part (2) of the composite beam is made of common concrete of C30-C60.
Further, the ultra-high ductility cement-based composite material comprises the following components in parts by mass: 10-30 parts of cement, 30-55 parts of fly ash, 0.01-5 parts of silica fume, 15-30 parts of sand, 0.1-10 parts of nickel slag sand, 0.1-10 parts of limestone powder, 8-25 parts of water, 0.05-0.5 part of polycarboxylic acid high-performance water reducing agent, 0.5-2 parts of polyethylene fiber, 0-0.02 part of cellulose ether, 0-0.01 part of welan gum and 0-0.1 part of nano silicon dioxide.
Furthermore, the particle size of the nickel slag sand is between 0.16 and 5mm, and the nickel slag sand is air-cooled or water-quenched nickel slag.
Further, the calcium carbonate content in the limestone powder is more than or equal to 90 percent, and the specific surface area is more than or equal to 300kg/m2。
By the scheme, the invention at least has the following advantages:
1. although the precast concrete industry realizes industrialization of the production of the traditional concrete, improves the production efficiency and the production quality to some extent, the precast concrete industry does not simplify the production process of the concrete, and also comprises the links of formwork support, reinforcement arrangement, pouring, maintenance and the like. On the other hand, the adoption of the superposed beams enables the bearing structure in the building structure to be partially prefabricated, but the higher requirements are often put forward to the template engineering in the prefabricating process, and the construction is more complicated than the site pouring of concrete. And the 3D printed concrete structure does not need to use a template and can be changed in shape at will. This provides great convenience in the production of profiled elements, such as the "U" shaped prefabricated element parts of a composite beam.
The surface appearance of the 2.3D printing process is controllable, the surface can be smooth, and the surface can also be rough. The novel 3D printing prefabricated superposed beam system is attractive in surface, and the prefabricated part and the cast-in-place part are well combined due to the fact that the prefabricated part and the cast-in-place part have natural rough surfaces. The constraints provided by the cast-in-place part also improve the interlayer performance of the 3D printing part. This results in improved overall cross-sectional integrity of the component.
The 3.3D printing prefabricated part is made of an ultrahigh-ductility cement-based composite material, so that the material performance is fully and reasonably utilized. Although the ultra-high ductility cement-based composite material has excellent tensile ductility, the compression resistance of the ultra-high ductility cement-based composite material is not greatly improved compared with that of common concrete, and sometimes the pressure bearing performance of the ultra-high ductility cement-based composite material is slightly reduced due to introduction of defects. The U-shaped prefabricated part of the composite beam is mainly positioned in a bearing and pulling area of the composite beam structure, and the ultra-high-ductility cement-based composite material is used in the area, so that the stress performance of the composite beam is improved. Although the concrete in the tension area does not consider the contribution of the concrete to the load bearing in the design process, the use of the ultra-high ductility cement-based composite material can improve the mechanical property of the tension area of the member, or improve the safety storage and the durability of the member under the condition of having the same mechanical property.
4. And the ultra-high-ductility cement-based material is adopted only in the U-shaped prefabricated part of the superposed beam, so that the performance of the member is improved, and the cost is controlled. The ultra-high ductility cement-based composite material adopts a matrix compounded by fibers with larger mixing amount and a plurality of cementing materials, so that the single manufacturing cost is higher than that of common concrete. In the process of popularization and application of the ultra-high ductility cement-based material, if the ultra-high ductility cement-based composite material is adopted for the whole section of the structure or the component, the structural cost is undoubtedly greatly improved. And when the ultra-high ductility cement-based composite material is used for a member mainly bearing pressure, the stress property and the advantages thereof are not reasonably exerted. Therefore, the ultra-high ductility cement-based composite material is only used for a composite beam U-shaped prefabricated part which is a member mainly based on bearing and pulling, and the balance between the performance and the cost is realized on the premise of reasonably utilizing the material performance. The method is a feasible way for popularizing the high-performance material of the ultra-high ductility cement-based composite material.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a novel 3D printing laminated beam system according to the present invention;
FIG. 2 is a schematic structural diagram of a U-shaped 3D printing prefabricated part of the composite beam in the invention;
fig. 3 is a schematic view of a lifting mode of a U-shaped 3D printing prefabricated part of the superposed beam.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention relates to a novel 3D printing superposed beam structure system, which is described in detail in the attached drawing.
As shown in fig. 1-3, a U-shaped 3D printing prefabricated part 1 and a cast-in-place part 2 of the superposed beam are cast to form a whole and bear load together;
the vertical ribs 3 of the U-shaped 3D printing prefabricated part of the superposed beam are uniformly distributed in the bottom of the U-shaped 3D printing prefabricated part 1 of the superposed beam and are used for resisting a positive bending moment of the superposed beam component during the midspan design of the construction period and the service period;
the construction studs 4 of the U-shaped 3D printing prefabricated part of the superposed beam are arranged on two wings of the U-shaped 3D printing prefabricated part 1 of the superposed beam;
hooping the U-shaped 3D printing prefabricated part 1 of the composite beam longitudinally from the outer surface of the bottom of the vertical rib 3 of the U-shaped 3D printing prefabricated part of the composite beam by using a hoop rib 5 of the U-shaped 3D printing prefabricated part of the composite beam, and resisting the design shearing force of the construction period and the service period of the composite beam component;
the construction stirrups 6 of the U-shaped 3D printing prefabricated part of the superposed beam transversely and uniformly hoop the U-shaped 3D printing prefabricated part 1 of the superposed beam from the outer surface of the construction stirrups 3 of the U-shaped 3D printing prefabricated part of the superposed beam;
the hanging ribs 7 of the U-shaped 3D printing prefabricated part of the superposed beam are vertically arranged on the outer surface of the construction vertical ribs 4 of the U-shaped 3D printing prefabricated part of the superposed beam, and two hanging ribs 7 are respectively arranged at two wings of the U-shaped 3D printing prefabricated part 1 of the superposed beam and are used for meeting the hanging requirements of the prefabricated part 1. As the U-shaped 3D printing prefabricated part 1 of the superposed beam belongs to a thin-wall member, vertical hoisting is required, and the structural cracking failure of the thin-wall member caused by hoisting is avoided.
The U-shaped 3D printing prefabrication part 1 of the superposed beam is formed by printing through a 3D printing concrete technology, a formwork is not required, vibration is not required, the outer surface of the U-shaped 3D printing prefabrication part 1 of the superposed beam is suitable for being printed into a flat surface, and the inner surface of the U-shaped 3D printing prefabrication part is printed into a rough surface.
The material used for the U-shaped 3D printing prefabricated part 1 of the composite beam is an ultra-high-ductility cement-based composite material, so that the U-shaped 3D printing prefabricated part 1 of the composite beam has extremely high stretching ductility and durability.
The ultra-high ductility cement-based composite material comprises the following components in parts by mass: 10-30 parts of cement, 30-55 parts of fly ash, 0.01-5 parts of silica fume, 15-30 parts of sand, 0.1-10 parts of nickel slag sand, 0.1-10 parts of limestone powder, 8-25 parts of water, 0.05-0.5 part of polycarboxylic acid high-performance water reducing agent, 0.5-2 parts of polyethylene fiber, 0-0.02 part of cellulose ether, 0-0.01 part of welan gum and 0-0.1 part of nano silicon dioxide.
The particle size of the nickel slag sand is 0.16-5 mm, and the nickel slag sand is air-cooled or water-quenched nickel slag.
The calcium carbonate content in the limestone powder is more than or equal to 90 percent, and the specific surface area is more than or equal to 300kg/m2。
The cast-in-place part 2 of the composite beam is made of C30-C60 common concrete and is cast in place after the U-shaped 3D printing prefabricated part of the composite beam is hoisted on site and installed.
Example one
The ultra-high ductility cement-based composite material for the U-shaped 3D printing prefabricated part of the superposed beam comprises the following components in parts by mass: 12 parts of cement, 48 parts of fly ash, 2 parts of silica fume, 18 parts of sand, 2 parts of nickel slag sand, 2 parts of limestone powder, 16 parts of water, 0.14 part of polycarboxylic acid high-performance water reducing agent, 1.3 parts of polyethylene fiber and 0.03 part of nano silicon dioxide.
The implementation process of the novel 3D printing superposed beam structure system is as follows:
1) 3D printing prefabrication construction is carried out on a U-shaped 3D printing prefabrication part of the superposed beam in a prefabrication factory, a printing path is designed according to the geometric shape of a component, and the printing is carried out layer by layer;
2) when the printing is carried out to the preset height, arranging corresponding steel bars, and continuing to print layer by layer;
3) after printing is finished, curing the concrete;
4) binding a cast-in-place part of reinforcing steel bars;
5) carrying out vertical hoisting installation and in-place installation;
4) and pouring the cast-in-place partial concrete to complete the construction of the beam body.
Example two
The ultra-high ductility cement-based composite material for the U-shaped 3D printing prefabricated part of the superposed beam comprises the following components in parts by mass: 19 parts of cement, 43 parts of fly ash, 1 part of silica fume, 20 parts of sand, 4 parts of limestone powder, 13 parts of water, 0.25 part of polycarboxylic acid high-performance water reducing agent, 1.7 parts of polyethylene fiber and 0.01 part of nano silicon dioxide.
The implementation process of the novel 3D printing superposed beam structure system is as follows:
1) 3D printing prefabrication construction is carried out on a U-shaped 3D printing prefabrication part of the superposed beam in a prefabrication factory, a printing path is designed according to the geometric shape of a component, and the printing is carried out layer by layer;
2) when the printing is carried out to the preset height, arranging corresponding steel bars, and continuing to print layer by layer;
3) after printing is finished, curing the concrete;
4) binding a cast-in-place part of reinforcing steel bars;
5) carrying out vertical hoisting installation and in-place installation;
4) and pouring the cast-in-place partial concrete to complete the construction of the beam body.
EXAMPLE III
The ultra-high ductility cement-based composite material for the U-shaped 3D printing prefabricated part of the superposed beam comprises the following components in parts by mass: 24 parts of cement, 36 parts of fly ash, 16 parts of sand, 4 parts of limestone powder, 20 parts of water, 0.18 part of polycarboxylic acid high-performance water reducing agent and 1.5 parts of polyethylene fiber.
The implementation process of the novel 3D printing superposed beam structure system is as follows:
1) 3D printing prefabrication construction is carried out on a U-shaped 3D printing prefabrication part of the superposed beam in a prefabrication factory, a printing path is designed according to the geometric shape of a component, and the printing is carried out layer by layer;
2) when the printing is carried out to the preset height, arranging corresponding steel bars, and continuing to print layer by layer;
3) after printing is finished, curing the concrete;
4) binding a cast-in-place part of reinforcing steel bars;
5) carrying out vertical hoisting installation and in-place installation;
4) and pouring the cast-in-place partial concrete to complete the construction of the beam body.
Table 1 shows the material performance and the component pouring condition of the invention, and the material performance is tested for flexural strength and compressive strength according to GB17671-1999 'Cement mortar Strength test method'. As can be seen from table 1, the novel 3D printed laminated beam structural system of the present invention has good integrity.
| Examples | Flexural strength | Compressive strength | Surface topography | Interfacial bonding |
| A | 15.3 | 42.8 | Smooth and crack-free | Good effect |
| II | 17.6 | 58.5 | Smooth and crack-free | Good effect |
| III | 13.3 | 32.7 | Smooth and crack-free | Good effect |
TABLE 1
When the composite beam is produced, the size and the rib arrangement form of the component can be changed at will according to actual needs, no template support and vibration are needed, the process flow is greatly simplified, and the production cost is reduced.
When the composite beam is produced, the material performance is fully and reasonably utilized, and the ultrahigh-ductility cement-based composite material is adopted in a tension area of the member, so that the mechanical property of the member is improved; the 3D printing of the naturally formed rough surface improves the interface combination of the prefabricated part of the superposed beam and the cast-in-place part, and the cast-in-place part improves the interlayer combination of the 3D printing prefabricated part; the cast-in-place part adopts common concrete to reduce the production cost of the superposed beam. All parts of the superposed beam complement each other, and the performance is synergistically improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a novel 3D prints coincide roof beam system which characterized in that: comprises that
A U-shaped 3D printing prefabricated part (1) of the superposed beam;
a cast-in-place part (2) of the composite beam;
3D printing studs (3) of the prefabricated part in a U-shaped mode of the superposed beam;
3D printing the construction studs (4) of the prefabricated part of the U-shaped superposed beam;
a stirrup (5) of a U-shaped 3D printing prefabricated part of the superposed beam;
3D printing a construction stirrup (6) of a prefabricated part of the U-shaped laminated beam;
3D printing hanging ribs (7) of the prefabricated part of the U-shaped superposed beam;
the U-shaped 3D printing prefabricated part of the superposed beam and the cast-in-place part of the superposed beam are poured together;
the stud (3) of the U-shaped 3D printing prefabricated part of the superposed beam is arranged in the bottom of the U-shaped 3D printing prefabricated part (1) of the superposed beam;
the construction studs (4) of the U-shaped 3D printing prefabricated part of the superposed beam are arranged on two wings of the U-shaped 3D printing prefabricated part (1) of the superposed beam;
hooping (5) of the U-shaped 3D printing prefabricated part of the superposed beam hoops the U-shaped 3D printing prefabricated part (1) of the superposed beam;
the construction stirrups (6) of the U-shaped 3D printing prefabricated part of the superposed beam hoop the U-shaped 3D printing prefabricated part (1) of the superposed beam;
the hanging ribs (7) of the U-shaped 3D printing prefabricated part of the superposed beam are vertically arranged on the outer surface of the construction vertical rib (4) of the U-shaped 3D printing prefabricated part of the superposed beam, and two hanging ribs (7) of the U-shaped 3D printing prefabricated part of the superposed beam are respectively arranged at two wings of the U-shaped 3D printing prefabricated part (1) of the superposed beam.
2. The novel 3D printing overlapping beam system of claim 1, wherein: the U-shaped 3D printing prefabricated part of the composite beam and the cast-in-place part of the composite beam are poured to form a whole through concrete pouring.
3. The novel 3D printing overlapping beam system of claim 1, wherein: the vertical ribs (3) of the U-shaped 3D printing prefabricated part of the superposed beam are uniformly distributed in the bottom of the U-shaped 3D printing prefabricated part (1) of the superposed beam.
4. The novel 3D printing overlapping beam system of claim 1, wherein: the hooping (5) of the U-shaped 3D printing prefabricated part of the composite beam longitudinally hoops the U-shaped 3D printing prefabricated part (1) of the composite beam from the outer surface of the bottom of the stud (3) of the U-shaped 3D printing prefabricated part of the composite beam.
5. The novel 3D printing overlapping beam system of claim 1, wherein: and the construction stirrups (6) of the U-shaped 3D printing prefabricated part of the superposed beam transversely and uniformly hoop the U-shaped 3D printing prefabricated part (1) of the superposed beam from the outer surfaces of the construction stirrups (4) of the U-shaped 3D printing prefabricated part of the superposed beam.
6. The novel 3D printing overlapping beam system of claim 1, wherein: the U-shaped 3D printing prefabricated part (1) of the superposed beam is formed by printing through a 3D printing concrete technology, the outer surface of the U-shaped 3D printing prefabricated part (1) of the superposed beam is a flat surface, and the inner surface of the U-shaped 3D printing prefabricated part is a rough surface.
7. The novel 3D printing overlapping beam system of claim 1, wherein: the U-shaped 3D printing prefabricated part (1) of the composite beam is made of an ultrahigh-ductility cement-based composite material, and the cast-in-place part (2) of the composite beam is made of common concrete of C30-C60.
8. The novel 3D printing overlapping beam system of claim 7, wherein: the ultra-high ductility cement-based composite material comprises the following components in parts by mass: 10-30 parts of cement, 30-55 parts of fly ash, 0.01-5 parts of silica fume, 15-30 parts of sand, 0.1-10 parts of nickel slag sand, 0.1-10 parts of limestone powder, 8-25 parts of water, 0.05-0.5 part of polycarboxylic acid high-performance water reducing agent, 0.5-2 parts of polyethylene fiber, 0-0.02 part of cellulose ether, 0-0.01 part of welan gum and 0-0.1 part of nano silicon dioxide.
9. The novel 3D printing overlapping beam system of claim 8, wherein: the particle size of the nickel slag sand is 0.16-5 mm, and the nickel slag sand is air-cooled or water-quenched nickel slag.
10. The novel 3D printing overlapping beam system of claim 9, wherein: the calcium carbonate content in the limestone powder is more than or equal to 90 percent, and the specific surface area is more than or equal to 300kg/m2。
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010122948 | 2020-02-27 | ||
| CN202010122948X | 2020-02-27 |
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| Publication Number | Publication Date |
|---|---|
| CN113309290A true CN113309290A (en) | 2021-08-27 |
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| CN202010464747.8A Pending CN113309290A (en) | 2020-02-27 | 2020-05-28 | Novel 3D prints coincide roof beam system |
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Cited By (1)
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| CN116517188A (en) * | 2023-07-03 | 2023-08-01 | 中冶检测认证有限公司 | Special-shaped beam and manufacturing method thereof |
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