CN111155693A - Method for manufacturing stirrup steel bar reactive powder concrete laminated slab - Google Patents
Method for manufacturing stirrup steel bar reactive powder concrete laminated slab Download PDFInfo
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- CN111155693A CN111155693A CN202010079498.0A CN202010079498A CN111155693A CN 111155693 A CN111155693 A CN 111155693A CN 202010079498 A CN202010079498 A CN 202010079498A CN 111155693 A CN111155693 A CN 111155693A
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- steel bars
- bottom plate
- pouring
- prefabricated bottom
- laminated slab
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0636—Three-dimensional reinforcing mats composed of reinforcing elements laying in two or more parallel planes and connected by separate reinforcing parts
- E04C5/064—Three-dimensional reinforcing mats composed of reinforcing elements laying in two or more parallel planes and connected by separate reinforcing parts the reinforcing elements in each plane being formed by, or forming a, mat of longitunal and transverse bars
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention discloses a method for manufacturing a stirrup steel bar reactive powder concrete laminated slab. Arranging a laminated slab, wherein the laminated slab consists of a prefabricated bottom plate, a post-pouring layer, shear steel bars and bottom steel bars; the bottom reinforcing bar contains vertical stress muscle and transverse distribution muscle, carry out ligature or welding with shear reinforcement and bottom reinforcing bar, then pour in putting into the mould of prefabricated bottom plate, the surface of floating prefabricated bottom plate during pouring, use the manual concrete embosser of 50 types again to carry out rough treatment to the surface of prefabricated bottom plate, carry out 28 days natural curing after the form removal, then transport the prefabricated bottom plate that has maintained to the job site, implement pouring and the maintenance of post-cast layer, the material ratio and the intensity of post-cast layer are with prefabricated bottom plate, assemble, after the assembly is accomplished, the formwork carries out secondary and pours and the maintenance, realize stirrup reinforcing bar active powder concrete superimposed sheet's preparation promptly. The laminated slab has very good bending resistance mechanical property and rigidity, is energy-saving and environment-friendly, is convenient to produce and has good durability.
Description
Technical Field
The invention belongs to the technical field of civil engineering structural members, and particularly relates to a manufacturing method of a stirrup steel bar active powder concrete laminated slab.
Background
The concrete laminated structure is an integral structure formed by manufacturing concrete prefabricated parts in a factory, transporting the concrete prefabricated parts to a site, assembling and then pouring a layer of concrete. The laminated structure can overcome the defects of complex procedures of a whole pouring type concrete structure and weakened integral rigidity of an assembly type structure, and has the advantages of the whole pouring type concrete structure and the assembly type structure, so that the laminated structure is widely applied to engineering.
The research of the reactive powder concrete starts from a Bouygues laboratory in France in 1993, coarse aggregates are removed according to the maximum compactness theory, raw materials of the reactive powder concrete are fine quartz sand, cement, silicon powder, fine steel fibers, a high-efficiency water reducing agent and the like, various particles are enabled to achieve the maximum compactness, and forced stirring is carried out on the traditional concrete forming process. Compared with common concrete, the reactive powder concrete has the advantages of ultrahigh strength, high toughness, high durability, high temperature tolerance and the like.
The reactive powder concrete is applied to the concrete composite slab of the fabricated building, so that the defects of heavy structure, poor durability, poor ductility and the like of the common concrete composite slab can be well overcome, and the reactive powder concrete has great significance for improving the strength of the structure for resisting load, reducing the section size and increasing the spanning capability of the structure.
Disclosure of Invention
The invention aims to provide a method for manufacturing a stirrup steel bar reactive powder concrete laminated slab.
The method comprises the following specific steps:
(1) arranging a laminated slab, wherein the laminated slab consists of a prefabricated bottom plate, a post-pouring layer, shear steel bars and bottom steel bars; the prefabricated bottom plate and the post-cast layer are formed by pouring active powder concrete, and the bottom steel bars comprise longitudinal stress bars and transverse distribution bars and are configured according to specific stress conditions.
(2) Binding or welding the shear steel bars and the bottom steel bars in the step (1), placing the binding or welding into a mold of a prefabricated bottom plate for pouring, trowelling the surface of the prefabricated bottom plate during pouring, roughly processing the surface of the prefabricated bottom plate by using a 50-type manual concrete embossing device, carrying out natural curing for 28 days after removing the mold, transporting the cured prefabricated bottom plate to a construction site, implementing pouring and curing of a post-pouring layer, assembling the post-pouring layer and the prefabricated bottom plate according to the material proportion and the strength, and after the assembly is completed, erecting the mold for secondary pouring and curing, namely realizing the manufacture of the stirrup steel bar active powder concrete laminated slab.
The reactive powder concrete is prepared by the following steps: weighing various required raw materials according to the mixing proportion of the reactive powder concrete, sequentially pouring quartz sand, steel fiber, cement and silica fume with three different particle sizes into a forced mixer for dry material stirring, wherein the process is 4 minutes, adding a water reducing agent and water, and fully stirring for 5-8 minutes to obtain the reactive powder concrete; the steel fibers are screened in by using a steel screen with the aperture of 12.5 mm.
The shear steel bars are stirrup steel bars, the stirrup steel bars are composed of upper chord steel bars and web member steel bars, the aspect ratio of the stirrup steel bars is 4:3, the upper chord steel bars and the web member steel bars are vertically arranged, and the distribution intervals of the web member steel bars are equal to the distribution intervals of transverse distribution ribs of the bottom steel bars.
The invention has the advantages that: the cross section size of the member can be effectively reduced, and the self weight of the structure is reduced, so that the cement consumption is reduced, and the energy conservation and environmental protection are realized; the member has good construction quality, is convenient for industrialized production, shortens the construction period, has small material loss, and reduces the requirements on site conditions of a construction site; the compressive and tensile strength and rigidity of the superposed member are obviously superior to those of common concrete members, and the axial compressive strength of the superposed member can reach 130N/mm2The above. The deformation of the component can be reduced in the stress stage, the cracking bending moment and the ultimate bending resistance bearing capacity of the component are improved, and the durability and the ductility of the plate are improved.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a stirrup reinforced reactive powder concrete composite constructed in accordance with an embodiment of the present invention.
FIG. 2 is a short sectional view of a stirrup reinforced reactive powder concrete composite constructed in accordance with an embodiment of the present invention.
Fig. 3 is a schematic perspective view of stirrup reinforcement of the stirrup reinforcement reactive powder concrete composite slab manufactured in the embodiment of the present invention.
Fig. 4 is a schematic perspective view of a prefabricated base plate, a post-cast layer and a laminated reinforcement cage of the stirrup reinforced reactive powder concrete laminated slab manufactured in the embodiment of the invention.
The labels in the figure are: 1-prefabricating a bottom plate; 2-post-pouring the layer; 3 a-upper chord steel bar; 3 b-web member reinforcing steel bars; 4 a-longitudinal stress bar; 4 b-transverse distribution ribs.
Detailed Description
Example (b):
the specific operation of the present invention is described below by using specific examples, and the operation of the present embodiment is only used for further illustration of the present invention, but not for limitation of the protection scope of the present invention, and the content of insubstantial changes made by those skilled in the art also belongs to the protection scope of the present invention.
With reference to fig. 1 to 4.
As shown in fig. 4, a laminated slab is provided, which is composed of a prefabricated base plate 1, a post-cast layer 2, shear reinforcements, and bottom reinforcements.
The bottom reinforcing steel bar is divided into a longitudinal stress bar C12@ 1504 a and a transverse distribution bar C8@ 2004 b, and the bottom reinforcing steel bar is configured according to specific engineering conditions.
The shear steel bars are stirrup steel bars as shown in fig. 1 and 2, and are composed of upper chord steel bars C103 a and web member steel bars C63 b, the aspect ratio of the stirrup steel bars is 4:3, the upper chord steel bars 3a are perpendicular to the web member steel bars 3b, and the distribution spacing of the web member steel bars 3b is equal to the distribution spacing of the transverse distribution bars 4b of the bottom steel bars.
As shown in fig. 4, before the prefabricated base plate 1 is poured, the shear steel bars and the base plate steel bars are bound.
The size of the prefabricated bottom plate 1 is 3020 (length) × 600 (width) × 70 (thickness), and the steel bar framework which is finished to be bound is put into a prepared template.
Sequentially pouring quartz sand, steel fiber (sieved by a steel sieve with the aperture of 12.5 mm), cement and silica fume with three different particle sizes into a forced mixer for dry material stirring, wherein the process is 4 minutes, then adding a water reducing agent and water, stirring for 6 minutes, fully stirring uniformly, pouring, and the axial compressive strength of the pouring can reach 142.3N/mm2。
And (3) after the pouring is finished, the surface of the prefabricated bottom plate 1 is leveled, then the surface of the prefabricated bottom plate 1 is subjected to rough treatment by using a 50-type manual concrete embosser to form a superposed surface with the roughness of 1.8mm, and finally natural curing is carried out for 28 days.
And (3) transporting the cured prefabricated bottom plate 1 to a construction site, pouring and curing the post-pouring layer 2, wherein the material proportion and the strength are the same as those of the bottom plate, the thickness of the post-pouring layer is 60mm, assembling is carried out, and after the assembly is finished, secondary pouring and curing are carried out by supporting a formwork, so that the stirrup reinforcement reactive powder concrete composite slab is manufactured. The total thickness of the laminated plate is 130 mm. Tests prove that the span-neutral bending moment value of the stirrup steel bar reactive powder concrete laminated slab manufactured in the embodiment, which reaches the bearing capacity limit state, is 36.95 kN.m.
Claims (1)
1. A method for manufacturing a stirrup steel bar reactive powder concrete laminated slab is characterized by comprising the following specific steps:
(1) arranging a laminated slab, wherein the laminated slab consists of a prefabricated bottom plate, a post-pouring layer, shear steel bars and bottom steel bars; the prefabricated bottom plate and the post-cast layer are formed by pouring active powder concrete, and the bottom steel bars comprise longitudinal stress bars and transverse distribution bars and are configured according to specific stress conditions;
(2) binding or welding the shear steel bars and the bottom steel bars in the step (1), placing the binding or welding into a mold of a prefabricated bottom plate for pouring, trowelling the surface of the prefabricated bottom plate during pouring, then using a 50-type manual concrete embosser to carry out rough treatment on the surface of the prefabricated bottom plate, carrying out natural curing for 28 days after removing the mold, then transporting the cured prefabricated bottom plate to a construction site, carrying out pouring and curing on a post-pouring layer, assembling the post-pouring layer with the prefabricated bottom plate in material proportion and strength, and after the assembly is finished, erecting the mold for secondary pouring and curing, namely realizing the manufacture of the stirrup steel bar active powder concrete laminated slab;
the reactive powder concrete is prepared by the following steps: weighing various required raw materials according to the mixing proportion of the reactive powder concrete, sequentially pouring quartz sand, steel fiber, cement and silica fume with three different particle sizes into a forced mixer for dry material stirring, wherein the process is 4 minutes, adding a water reducing agent and water, and fully stirring for 5-8 minutes to obtain the reactive powder concrete; the steel fibers are screened in by using a steel screen with the aperture of 12.5 mm;
the shear steel bars are stirrup steel bars, the stirrup steel bars are composed of upper chord steel bars and web member steel bars, the aspect ratio of the core size of the cross section is 4:3, the upper chord steel bars and the web member steel bars are vertically arranged, and the distribution spacing of the web member steel bars is equal to the distribution spacing of transverse distribution bars of the bottom steel bars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079498.0A CN111155693A (en) | 2020-02-04 | 2020-02-04 | Method for manufacturing stirrup steel bar reactive powder concrete laminated slab |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079498.0A CN111155693A (en) | 2020-02-04 | 2020-02-04 | Method for manufacturing stirrup steel bar reactive powder concrete laminated slab |
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| CN111155693A true CN111155693A (en) | 2020-05-15 |
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| CN202010079498.0A Pending CN111155693A (en) | 2020-02-04 | 2020-02-04 | Method for manufacturing stirrup steel bar reactive powder concrete laminated slab |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112176850A (en) * | 2020-09-30 | 2021-01-05 | 长沙理工大学 | Steel-UHPC combined structure shear connector and manufacturing and mounting method thereof |
-
2020
- 2020-02-04 CN CN202010079498.0A patent/CN111155693A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112176850A (en) * | 2020-09-30 | 2021-01-05 | 长沙理工大学 | Steel-UHPC combined structure shear connector and manufacturing and mounting method thereof |
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