CN111155694A - Manufacturing method of steel bar truss reactive powder concrete laminated slab - Google Patents

Abstract

The invention discloses a method for manufacturing a steel bar truss 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 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. Binding or welding the shear steel bars and the bottom steel bars, placing the shear steel bars and the bottom steel bars into a mold of the prefabricated bottom plate for pouring, carrying out natural curing for 28 days after the mold is removed, then 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 of the post-pouring layer, and after the assembly is completed, erecting the mold for secondary pouring and curing, namely realizing the manufacturing of the steel bar truss active powder concrete laminated slab. The invention has very good bending mechanical property and rigidity, energy saving, environmental protection, convenient production and good durability.

Description

Manufacturing method of steel bar truss reactive powder concrete laminated slab

Technical Field

The invention belongs to the technical field of civil engineering structural members, and particularly relates to a manufacturing method of a steel bar truss reactive 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 steel bar truss 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, carrying out pouring and curing on 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 finished, erecting the mold for secondary pouring and curing, namely realizing the manufacture of the steel bar truss 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.

Shear reinforcement adopts steel bar truss, steel bar truss is by a last chord reinforcing bar, two web member reinforcing bars and two last chord reinforcing bars constitute, the cross-section is the isosceles triangle that the end height equals, last chord reinforcing bar and last chord reinforcing bar parallel arrangement, the web member reinforcing bar is buckled by a reinforcing bar and is formed the type sinusoidal wave form, all buckling point distribute on two straight lines, the interval between the adjacent buckling point on the same straight line equals the interval of the horizontal distribution muscle of bottom reinforcing bar, a web member reinforcing bar has been welded respectively between last chord reinforcing bar and two last chord reinforcing 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 memberCan reach 130N/mm²The above. The deformation of the component can be reduced in the stress stage, and the cracking bending moment and the ultimate bending resistance bearing capacity of the component are improved. The plate combines the advantages of both laminated plate and active powder concrete, can greatly reduce self weight, and improves the durability and ductility of the plate.

Drawings

Fig. 1 is a longitudinal sectional view of a steel bar truss reactive powder concrete composite slab manufactured in an embodiment of the present invention.

Fig. 2 is a short sectional view of a steel bar truss reactive powder concrete composite slab manufactured in an embodiment of the present invention.

Fig. 3 is a schematic perspective view of a steel bar truss of the steel bar truss reactive powder concrete composite slab manufactured in the embodiment of the invention.

Fig. 4 is a schematic perspective view of a prefabricated bottom plate, a post-cast layer and a superimposed steel reinforcement framework of the steel bar truss reactive powder concrete superimposed sheet manufactured in the embodiment of the present 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; 3 c-lower chord 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 bar adopts a steel bar truss as shown in fig. 1 and 2, and is composed of an upper chord steel bar C103 a, two web member steel bars C63b and two lower chord steel bars C103C, the cross section of the shear steel bar is in an isosceles triangle shape with equal bottom height, the upper chord steel bar 3a and the lower chord steel bar 3C are arranged in parallel, the web member steel bar 3b is bent by one steel bar to form a sine-like waveform, all bending points are distributed on two straight lines, the distance between adjacent bending points on the same straight line is equal to the distance between the transverse distribution ribs 4b of the bottom steel bar, and one web member steel bar 3b is respectively welded between one upper chord steel bar 3a and two lower chord steel bars 3C.

As shown in fig. 4, before the prefabricated floor panel 1 is poured, the shear reinforcement and the floor reinforcement are welded.

The prefabricated bottom plate 1 has the size of 3020 (length) × 600 (width) × 70 (thickness), and the welded steel reinforcement framework is placed in 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 6.5 minutes, fully stirring uniformly, pouring, and the axial compressive strength of the mixture can reach 138N/mm²。

And 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 the action period is 28 days of natural curing after the form removal.

And (3) transporting the cured prefabricated bottom plate 1 to a construction site, pouring and curing the post-pouring layer 2, wherein the material ratio and the strength are the same as those of the bottom plate, the thickness of the post-pouring layer is 60mm, assembling, and after the assembly is finished, secondary pouring and curing are carried out on a formwork, so that the manufacturing of the steel bar truss reactive powder concrete laminated slab is realized. The total thickness of the laminated plate is 130 mm. Tests prove that the span-span bending moment value of the steel bar truss reactive powder concrete laminated slab manufactured in the embodiment reaching the bearing capacity limit state is 38.81 kN.m.

Claims (1)

1. A manufacturing method of a steel bar truss 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 steel bar truss 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;

shear reinforcement adopts steel bar truss, steel bar truss is by a last chord reinforcing bar, two web member reinforcing bars and two last chord reinforcing bars constitute, the cross-section is the isosceles triangle that the end height equals, last chord reinforcing bar and last chord reinforcing bar parallel arrangement, the web member reinforcing bar is buckled by a reinforcing bar and is formed the type sinusoidal wave form, all buckling point distribute on two straight lines, the interval between the adjacent buckling point on the same straight line equals the interval of the horizontal distribution muscle of bottom reinforcing bar, a web member reinforcing bar has been welded respectively between last chord reinforcing bar and two last chord reinforcing bars.

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