Built-in porous steel plate-foam concrete composite floor

Abstract

The invention discloses a built-in porous steel plate-foam concrete composite floor, and belongs to the field of constructional engineering. A built-in porous steel plate-foam concrete composite floor comprises a multi-cavity steel plate shell, a built-in porous steel plate and foam concrete. Wherein the multi-cavity steel plate shell comprises a first longitudinal steel plate, a second longitudinal steel plate, a first transverse steel plate, a second transverse steel plate and a bottom plate, the built-in porous steel plates are welded to the multi-cavity steel plate shell, the built-in porous steel plates are welded in a crossed mode to form regular cavities, the foam concrete is poured into the regular cavities to form the built-in porous steel plate-foam concrete composite floor, reliable bonding between holes of the cavity steel plates and the foam concrete is achieved, and therefore an integral structure is formed. According to the built-in porous steel plate-foam concrete composite floor slab, through combination of the built-in porous steel plate and the foam concrete, the integrity and strength of the composite floor slab are improved, and the self weight of components is reduced; the multi-cavity steel plate shell and the built-in porous steel plate replace tensile steel bars and stirrups in a traditional floor, and formed regular cavities can effectively restrain the problems of deformation, cracking and the like of foam concrete. The floor has good sound insulation and heat insulation performance and is suitable for various constructional engineering. The structure is simple, construction is convenient, and high economic benefits and popularization value are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel - concrete composite slabs, and particularly to a built - in perforated steel plate - foamed concrete composite floor slab. Background Art

[0002] At present, many high - rise buildings are still of reinforced concrete structure, which has a large self - weight, poor crack resistance, a long construction period, and a high cost for later maintenance. With the ever - changing building shapes and continuous extension of building dimensions, higher requirements are put forward for modern concrete structures. At the same time, the country vigorously develops prefabricated buildings, and new processes and technologies of steel - concrete composite structures are developing into the fifth major structural system after masonry structures, steel structures, concrete structures, and wood structures. The steel - concrete composite structure has great advantages. Combining the steel structure and the concrete structure can achieve the composite effect of the combined structure where "1 + 1>2". As an important load - bearing member in building structures, improving the mechanical properties of the floor slab has important practical significance.

[0003] The interface problem is a hot issue in the research of steel - concrete composite floor slabs, and the bond between the two has an important impact on the overall performance of the composite structure. In addition, as a new type of green building engineering material, foamed concrete has good sound absorption, heat preservation, and heat insulation properties and is widely used in the field of building engineering. However, directly applying foamed concrete to load - bearing structures has problems such as easy cracking and low strength. Therefore, it is necessary to combine high - strength steel plates with lightweight foamed concrete to form a lightweight and high - strength steel - foamed concrete composite floor slab.

[0004] Therefore, there is a need for a built - in perforated steel plate - foamed concrete composite floor slab with light weight, high strength, good stiffness, and excellent crack resistance to solve the above problems. Summary of the Invention

[0005] Aiming at the defects existing in the prior art, the present invention provides a built - in perforated steel plate - foamed concrete composite floor slab and its preparation method.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An internally porous steel plate - foamed concrete composite floor slab, characterized in that: it includes a multi - chamber steel plate shell, internally porous steel plates and foamed concrete; wherein: the multi - chamber steel plate shell is composed of a first longitudinal steel plate, a second longitudinal steel plate, a first transverse steel plate, a second transverse steel plate and a bottom plate. The first longitudinal steel plate and the second longitudinal steel plate are arranged in parallel at intervals transversely, the first transverse steel plate and the second transverse steel plate are arranged perpendicular to the longitudinal steel plates, and the bottom plate is welded and fixed to the bottom of the longitudinal and transverse steel plates; the internally porous steel plates are fixedly arranged inside the multi - chamber steel plate shell and intersect with each other to enclose a regular rectangular grid - shaped cavity structure; the foamed concrete is filled in the cavity structure formed by the enclosure of the porous steel plates and the multi - chamber steel plate shell, and a mechanical interlocking connection is formed through the pores of the porous steel plates and the foamed concrete, constituting an integral composite structure that collaboratively bears force.

[0008] Aiming at the interface slip problem existing in the existing steel - concrete composite floor slab, the present invention proposes an internally porous steel plate - foamed concrete composite floor slab, including a multi - chamber steel plate shell, internally porous steel plates and foamed concrete. Utilizing the self - compacting characteristics of foamed concrete, a non - vibrating construction process is realized, reducing the construction difficulty and ensuring the filling density. In addition, the multi - chamber constraint system effectively inhibits the shrinkage and cracking of foamed concrete, and at the same time improves the overall performance of the internally porous steel plate - foamed concrete composite floor slab.

[0009] Furthermore, the cut of the internally porous steel plate is rectangular, the width is 1 mm larger than the thickness of the porous steel plate, and the height is 1 / 2 of the height of the porous steel plate; the cavities of the two steel plates are vertically cross - inserted through the cuts, and the total height of the combined body after insertion is 5 mm lower than that of the steel plate shell. The multi - chamber space is formed by the enclosure of the cross - inserted porous steel plate cavities and the steel plate shell, and its cross - section is a square grid - shaped structure with uniform distribution, and the grid size is 200 mm×200 mm.

[0010] The traditional connection method of porous steel plates is welding, and stress concentration is likely to occur at the weld, resulting in a change in the internal stress distribution mode during the load - bearing process of the internally porous steel plate - foamed concrete composite floor slab, affecting the mechanical properties. Based on this, the present invention proposes to splice the porous steel plates into a grid - shaped structure by means of insertion, and the transverse and longitudinal steel plates restrain each other, with simple operation.

[0011] Furthermore, the thickness of the multi - chamber steel plate shell is 0.7 - 1.5 mm, the thickness of the bottom plate is 1 - 1.5 mm, longitudinal perforated steel plates are arranged at intervals of 200 mm between the first longitudinal steel plate and the second longitudinal steel plate arranged in parallel transversely, and transverse perforated steel plates are arranged at intervals of 200 mm between the first transverse steel plate and the second transverse steel plate arranged longitudinally.

[0012] The bottom plate serves as the tensile reinforcement of the composite floor slab and can also be used as a formwork during the casting of foamed concrete. Therefore, its thickness is greater than that of the multi-chamber steel plate shell. The inventor found in previous research that when the cavity size is 200mm×200mm, the bearing capacity is relatively strong.

[0013] Furthermore, the holes in the perforated steel plate are circular holes with a radius of 5mm. The centers of adjacent holes are arranged in a staggered pattern at equal intervals longitudinally and transversely. The longitudinal row spacing (L 1 ) is 15mm, and the transverse column spacing (L 2 ) is 10mm. The overall hole opening rate is 35% ± 2%. The foam concrete flow channels formed by the staggered distribution of the holes penetrate the perforated steel plate, and in the direction perpendicular to the floor slab plane, the overlapping rate of the hole projections of adjacent perforated steel plates is less than 30%.

[0014] To avoid stress concentration at the four corner points of the perforated steel plate in one direction, when the component is loaded, the stress concentration is transmitted along the adjacent holes at the weak points, damaging the perforated steel plate. Therefore, the hole shape of the perforated steel plate in this solution is circular; the internal perforated steel plates are arranged in a staggered manner to act as the stressed steel bars in the floor slab, and the holes are arranged in a staggered manner to prevent the generation of cracks induced in the height direction.

[0015] Furthermore, connection bolt installation holes and embedded connector positioning holes are symmetrically arranged in the four corner chambers of the multi-chamber steel plate shell. The installation holes and positioning holes are distributed at intervals along the chamber axis for realizing the assembly connection of the composite floor slab with adjacent components.

[0016] Furthermore, a kind of internal perforated steel plate - foamed concrete composite floor slab is characterized by including the following steps:

[0017] S1: Fabricate the multi-chamber steel plate shell

[0018] The multi-chamber steel plate shell includes first longitudinal steel plates and second longitudinal steel plates arranged in parallel and spaced transversely, first transverse steel plates and second transverse steel plates perpendicular to the longitudinal steel plates, and a bottom plate welded and fixed to the bottoms of the longitudinal steel plates and transverse steel plates. The connection mode between the first longitudinal steel plates and the second longitudinal steel plates and the first transverse steel plates and the second transverse steel plates is welding. The internal perforated steel plates are fixed on the multi-chamber steel plate shell, and the internal perforated steel plates intersect with each other to form a grid-like cavity structure. The perforated steel plates and the multi-chamber steel plate shell form a cavity structure.

[0019] S2: Preparation and casting of foamed concrete

[0020] Add cement and fly ash to a special mixer for foam concrete and stir for 2 minutes to obtain a base material mixture 1. Add mixing water containing polycarboxylate superplasticizer to the mixture 1 and stir for 45 - 60 seconds to obtain a mixture 2. Add prefabricated foam to the mixture 2 to prepare foam concrete. After fluidity testing, fill the foam concrete into a regular grid-shaped cavity.

[0021] S3: Install the floor slab

[0022] As described in claim 5, after the built-in perforated steel plate - foam concrete composite floor slab is cured, transport and hoist the floor slab structure to the construction site and install and fix it with bolts.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] 1. For the built-in perforated steel plate - foam concrete composite floor slab of the present invention, lightweight and porous foam concrete is applied to load-bearing members. Through structural design optimization, an organic combination of lightweight concrete and high-strength steel plates is achieved, realizing the technical effect of lightweight and high strength, improving the service life of structural members, and reducing the later operation and maintenance costs.

[0025] 2. For the built-in perforated steel plate - foam concrete composite floor slab of the present invention, the structural members are prefabricated in the factory for standardized production, which has the advantages of low cost and convenient construction. At the same time, it can give play to the heat preservation, sound insulation, and noise insulation performance of foam concrete.

[0026] 3. For the built-in perforated steel plate - foam concrete composite floor slab of the present invention, the mechanical bite between the foam concrete and the perforated steel plate improves the bearing capacity and structural stability of the composite floor slab. Optimizing the hole distribution parameters and hole diameter size effectively avoids the stress concentration phenomenon. The square mesh cavity effectively constrains the foam concrete, inhibits the cracking and damage of the material, and a good mechanical coupling is formed between the multi-chamber steel plate shell and the foam concrete. Description of the Drawings

[0027] Figure 1 It is a structural schematic diagram of a built-in perforated steel plate - foam concrete composite floor slab (without pouring foam concrete) of the present invention;

[0028] Figure 2 It is an insertion schematic diagram of the built-in perforated steel plate of a built-in perforated steel plate - foam concrete composite floor slab of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the positioning and connection of a built-in perforated steel plate - foam concrete composite floor slab of the present invention;

[0030] Figure 4 It is a chamber structure diagram of a built-in perforated steel plate - foam concrete composite floor slab of the present invention;

[0031] In the figure: 1 - First longitudinal steel plate, 2 - Second longitudinal steel plate, 3 - First transverse steel plate, 4 - Second transverse steel plate, 5 - Bottom plate, 6 - Longitudinal perforated steel plate, 7 - Transverse perforated steel plate, 8 - Perforated steel plate cut, 9 - Bolt installation hole, 10 - Embedded connector positioning hole. Specific implementation mode

[0032] Example 1:

[0033] As Figure 1 shown, a built-in perforated steel plate - foam concrete composite floor slab includes a multi - cavity steel plate shell, an internal perforated steel plate, and foam concrete; among them: the multi - cavity steel plate shell is composed of a first longitudinal steel plate 1, a second longitudinal steel plate 2, a first transverse steel plate 3, a second transverse steel plate 3, and a bottom plate 5. The first longitudinal steel plate 1 and the second longitudinal steel plate 2 are arranged horizontally in parallel at intervals, the first transverse steel plate 3 and the second transverse steel plate 3 are arranged perpendicular to the longitudinal steel plates, and the bottom plate 5 is welded and fixed to the bottom of the longitudinal and transverse steel plates; the internal perforated steel plate 6 is fixedly arranged inside the multi - cavity steel plate shell and intersects with each other to enclose a regular rectangular grid - shaped cavity structure, as Figure 4 shown; the foam concrete is filled in the cavity structure formed by the enclosure of the perforated steel plate and the multi - cavity steel plate shell. Through the pores of the perforated steel plate and the foam concrete, a mechanical interlocking connection is formed to constitute an integral composite structure that works together.

[0034] The internal perforated steel plate cut 8 is rectangular, with a width 1 mm larger than the thickness of the perforated steel plate and a height of 1 / 2 of the height of the perforated steel plate; the two steel plate cavities are vertically cross - inserted through the cut, and the total height of the combined body after insertion is 5 mm lower than the steel plate shell, as Figure 2 shown. The multi - cavity space is formed by the enclosure of the cross - inserted perforated steel plate cavities and the steel plate shell, and its cross - section is a uniformly distributed square grid - shaped structure with a grid size of 200 mm × 200 mm.

[0035] The thickness of the multi - cavity steel plate shell is 0.7 - 1.5 mm, the thickness of the bottom plate is 1 - 1.5 mm. The longitudinal perforated steel plates 6 are arranged at intervals of 200 mm between the horizontally parallel - arranged first longitudinal steel plate 1 and the second longitudinal steel plate 2, and the transverse perforated steel plates 7 are arranged at intervals of 200 mm between the longitudinally arranged first transverse steel plate 3 and the second transverse steel plate 4.

[0036] The holes of the perforated steel plate are circular holes with a radius of 5 mm, and the centers of adjacent holes are arranged in a staggered pattern at equal intervals longitudinally and transversely. The longitudinal row spacing (L 1 ) is 15 mm, and the transverse column spacing (L 2) is 10 mm, and the overall porosity is 35% ± 2%; the foam concrete flow channels formed by the staggered distribution of the holes penetrate the perforated steel plates, and in the direction perpendicular to the floor plane, the hole projection coincidence rate of adjacent perforated steel plates is less than 30%.

[0037] The working principle of a built-in perforated steel plate - foam concrete composite floor provided by the present invention is as follows:

[0038] The built-in perforated steel plates are cross-connected with each other to enclose a cavity structure, and are filled in the cavity by the self-compacting property of the foam concrete, forming a reliable bond with the built-in perforated steel plates. The bottom plates of the multi-cavity steel plate outer shells and the transverse perforated steel plates serve as the "tensile steel bars" of the composite floor, and the longitudinal perforated steel plates serve as the stirrups and erection bars of the composite floor, enhancing the bearing capacity of the composite floor; as Figure 4 shown, the foam concrete is constrained in the cavity, restricting its cracks and deformation; the round holes of the perforated steel plates are staggered in distribution, and when a certain round hole is damaged, the adjacent round holes are not affected.

[0039] Connecting bolt mounting holes (8) and embedded connector positioning holes (10) are symmetrically arranged in the corner chambers at the four corners of the multi-cavity steel plate outer shell. The mounting holes and the positioning holes are spaced along the axis of the chamber for realizing the assembly connection of the composite floor with adjacent components.

[0040] Before pouring the foam concrete, insert embedded parts into the embedded connector positioning holes (10), install lifting rings on the embedded parts, transport and hoist the floor slab to the construction site, and remove the lifting rings after the floor slab hoisting is completed.

[0041] Example 2:

[0042] The preparation method of the above-mentioned built-in perforated steel plate - foam concrete composite floor is as follows:

[0043] S1: Fabricate the multi-cavity steel plate outer shell

[0044] The multi-cavity steel plate outer shell includes first longitudinal steel plates (1) and second longitudinal steel plates (2) arranged horizontally and spaced apart in parallel, first transverse steel plates (3) and second transverse steel plates (4) perpendicular to the longitudinal steel plates, and bottom plates (5) welded and fixed to the bottoms of the longitudinal steel plates and the transverse steel plates. The connection mode between the first longitudinal steel plates (1) and the second longitudinal steel plates (2) and the first transverse steel plates (3) and the second transverse steel plates (4) is welding. The built-in perforated steel plates are fixed on the multi-cavity steel plate outer shell, and the built-in perforated steel plates cross each other to form a grid-like cavity structure. The perforated steel plates and the multi-cavity steel plate outer shell form a cavity structure.

[0045] S2: Preparation and pouring of the foam concrete

[0046] Add cement and fly ash into a special mixer for foam concrete and stir for 2 minutes to obtain base material mixture 1. Add mixing water containing polycarboxylate superplasticizer into the mixture 1 and stir for 45 - 60 seconds to obtain mixture 2. Add prefabricated foam into the mixture 2 to prepare foam concrete. After fluidity test, fill the foam concrete into a cavity with a regular grid shape.

[0047] S3: Install the floor slab

[0048] As described in claim 5, after the curing of the built-in perforated steel plate - foam concrete composite floor slab is completed, transport and hoist the floor slab structure to the construction site and install and fix it with bolts.

[0049] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A built-in porous steel plate-foam concrete composite floor, characterized by: The invention comprises a multi-cavity steel plate shell, an internal porous steel plate and foamed concrete; wherein: the multi-cavity steel plate shell is composed of a first longitudinal steel plate (1), a second longitudinal steel plate (2), a first transverse steel plate (3), a second transverse steel plate (3) and a bottom plate (5), wherein the first longitudinal steel plate (1) and the second longitudinal steel plate (2) are arranged in parallel and spaced relation in the transverse direction, the first transverse steel plate (3) and the second transverse steel plate (3) are arranged perpendicular to the longitudinal steel plates, and the bottom plate (5) is welded and fixed to the bottom of the longitudinal steel plate and the transverse steel plate; the internal porous steel plates (6) are fixedly arranged inside the multi-cavity steel plate shell, and cross each other to form a regular rectangular grid-shaped cavity structure; the foamed concrete is filled in the cavity structure formed by the porous steel plates and the multi-cavity steel plate shell, and is mechanically engaged with the foamed concrete through the pores of the porous steel plates, so as to form an integral composite structure that is subjected to coordinated force.

2. The built-in porous steel plate-foam concrete composite floor according to claim 1, characterized in that: The built-in porous steel plate cutout (8) is rectangular, with a width 1 mm greater than the thickness of the porous steel plate and a height of 1 / 2 of the height of the porous steel plate; the two steel plate cavities are vertically cross-plugged through the cutout, and the total height of the plugged assembly is 5 mm lower than the steel plate shell. The multi-cavity space is formed by the cross-plugged porous steel plate cavity and the steel plate shell, and its cross-section is a uniformly distributed square grid structure with a grid size of 200 mm×200 mm.

3. The built-in porous steel plate-foam concrete composite floor according to claim 1, characterized in that: The outer shell of the multi-cavity steel plate has a thickness of 0.7 to 1.5 mm, and the bottom plate has a thickness of 1 to 1.5 mm. A longitudinal perforated steel plate (6) is arranged every 200 mm between the first longitudinal steel plate (1) and the second longitudinal steel plate (2) which are arranged in parallel and spaced relation. A transverse perforated steel plate (7) is arranged every 200 mm between the first transverse steel plate (3) and the second transverse steel plate (4) which are arranged in parallel and spaced relation.

4. The built-in porous steel plate-foam concrete composite floor according to claim 1, characterized in that: The holes of the perforated steel plate are circular holes with a radius of 5 mm, and the centers of adjacent holes are staggered at equal intervals in the longitudinal and transverse directions, with a longitudinal row spacing (L1) of 15 mm, a transverse column spacing (L2) of 10 mm, and an overall opening rate of 35%±2%. The foam concrete flow channel formed by the staggered distribution of the holes runs through the perforated steel plate, and in the direction perpendicular to the floor plane, the overlap rate of the hole projections of adjacent perforated steel plates is less than 30%.

5. The built-in porous steel plate-foam concrete composite floor according to claim 2, characterized in that: Connecting bolt mounting holes (8) and embedded connecting piece positioning holes (10) are symmetrically arranged in the four corner chambers of the multi-cavity steel plate shell. The mounting holes and positioning holes are spaced apart along the chamber axis to realize assembly connection between the composite floor and adjacent components.

6. The built-in porous steel plate-foam concrete composite floor according to claim 1, characterized in that: The following steps are involved: S1: Making a multi-cavity steel shell The multi-cavity steel plate shell comprises a first longitudinal steel plate (1) and a second longitudinal steel plate (2) arranged in parallel and spaced relation in the transverse direction, a first transverse steel plate (3) and a second transverse steel plate (4) perpendicular to the longitudinal steel plates, and a bottom plate (5) welded and fixed to the bottom of the longitudinal steel plates and the transverse steel plates, the first longitudinal steel plate (1) and the second longitudinal steel plate (2) and the first transverse steel plate (3) and the second transverse steel plate (4) are connected by welding, the built-in porous steel plate is fixed on the multi-cavity steel plate shell, the built-in porous steel plates are crossed with each other to form a grid-like cavity structure, and the porous steel plate and the multi-cavity steel plate shell form a cavity structure. S2: Preparation and pouring of foamed concrete Cement and fly ash are added to a special mixer for foam concrete and stirred for 2 minutes to obtain a base material mixture 1, mixing water containing a polycarboxylic acid-based water reducer is added to the mixture 1 and stirred for 45-60 seconds to obtain a mixture 2, prefabricated foam is added to the mixture 2 to obtain foam concrete, and the foam concrete is filled into a regular grid-shaped cavity after a fluidity test. S3: Installing the floor slab According to claim 5, after the curing of the built-in porous steel plate-foam concrete composite floor is completed, the floor structure is transported and hoisted to the construction site and fixed with bolts.

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