CN115288348B - Bottom die of steel bar truss and preparation method thereof - Google Patents
Bottom die of steel bar truss and preparation method thereof Download PDFInfo
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- CN115288348B CN115288348B CN202211107512.9A CN202211107512A CN115288348B CN 115288348 B CN115288348 B CN 115288348B CN 202211107512 A CN202211107512 A CN 202211107512A CN 115288348 B CN115288348 B CN 115288348B
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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
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
- E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
- E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/388—Treating surfaces of moulds, cores, or mandrels to prevent sticking with liquid material, e.g. lubricating
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/044—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of concrete
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/06—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres reinforced
-
- 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
- E04C5/065—Light-weight girders, e.g. with precast parts
- E04C5/0653—Light-weight girders, e.g. with precast parts with precast parts
- E04C5/0656—Light-weight girders, e.g. with precast parts with precast parts with lost formwork
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention relates to the technical field of building floor slabs, and provides a steel bar truss bottom die and a preparation method thereof, wherein a steel bar truss is of a steel bar cage structure formed by welding a plurality of steel bars, a bottom plate is made of a concrete mixed material, and when concrete is not solidified, the steel bar cage is arranged at the upper part of the bottom plate so that the lower part of a web member steel bar extends into the concrete and is compacted, and the lower part of the web member steel bar extends into the bottom plate; the preparation method reduces the strength of the field operation of workers, optimizes the field construction environment, is environment-friendly, and enables the whole construction period and the construction quality to be controllable; the invention also effectively reduces the on-site supporting equipment or realizes the support-free, reduces the carbon emission in the metal production and supporting equipment process, reduces the wood formula manufacturing and wood product usage amount of the trees, saves forest resources and accords with the idea of carbon reduction and neutralization; and detecting the performances of the bottom plate, the steel bar truss and the steel bar truss bottom die, and meeting the standard requirements.
Description
Technical Field
The invention relates to the technical field of building floors, in particular to a steel bar truss bottom die and a preparation method thereof.
Background
The prior high-rise building generally adopts a steel building carrier plate, the structure is that a profiled steel plate with a certain rib height is adopted to be combined with concrete, and the floor slab has some defects in construction. For example, the indoor building height of a building can be reduced, the lower surface of a floor slab is easy to be uneven, the binding procedure of site reinforcing steel bars is complex, the spacing of the reinforcing steel bars and the thickness of a concrete protection layer are not easy to control, the working strength of the site construction of workers is high, the number of on-site required supporting devices is large, the dismounting operation is complex, and therefore the construction period and the construction quality of the whole building are difficult to ensure. With the development of floor steel structures in the building industry and the requirements on the layer height and the like, the requirements on the cast-in-situ floor steel bar truss structure are also higher and higher. At present, single-node connection tensile bearing force, size deviation and the like of the bottom die of the steel bar truss are not perfect enough, and the problem to be solved in the building industry is urgent.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a steel bar truss bottom die and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a steel bar truss bottom die, which comprises a bottom plate 1 and a steel bar truss 2;
the steel bar truss 2 is obtained by vertically welding a plurality of single steel bar cages through a plurality of stiffening steel bars 3;
each single reinforcement cage comprises an upward rotation reinforcement 4, 2 downward rotation reinforcement 5 and a plurality of web member reinforcement 6; the upward rotation steel bars 4 and the 2 downward rotation steel bars 5 are welded with the web member steel bars 6 to form an integrated structure with isosceles triangle cross sections;
the lower part of the web member steel bar 6 is fixedly connected with the bottom plate 1.
Preferably, each single reinforcement cage further comprises a plurality of support transverse ribs 7 and a plurality of support vertical ribs 8;
the support transverse ribs 7 are horizontally connected with the 2 downward-rotation steel bars 5; the upward-rotation steel bars 4 are vertically connected with the plurality of support transverse bars 7 through the plurality of support vertical bars 8.
Preferably, the number of the plurality of single reinforcement cages is greater than or equal to 3, and the number of the plurality of stiffening reinforcements is greater than or equal to 7.
Preferably, the number of the transverse ribs of the plurality of supports is more than or equal to 3, and the number of the vertical ribs of the plurality of supports is more than or equal to 3.
Preferably, the thickness of the bottom plate is 15-20 mm.
Preferably, the bottom plate is prepared from the following raw materials in parts by mass:
188-191 parts of water, 400-405 parts of 325 cement, 540-545 parts of sand material, 1260-1265 parts of stone, the mass of the additive is less than or equal to 2% of the mass of 325 cement, and the particle size of the sand material is 3-5 mm; or (b)
173-176 parts of water, 458-463 parts of 325 cement, 510-515 parts of sand material, 1248-1255 parts of stone, wherein the mass of the additive is less than or equal to 2% of the mass of 325 cement, and the particle size of the sand material is 3-5 mm; or (b)
163-168 parts of water, 430-433 parts of 425 cement, 550-560 parts of sand material and 1240-1250 parts of stone, wherein the mass of the additive is less than or equal to 2% of the mass of 425 cement, and the particle size of the sand material is less than 5mm; or (b)
190-195 parts of water, 485-490 parts of 525 cement, 560-565 parts of sand material, 1195-1205 parts of stone, the mass of the additive is less than or equal to 2% of the mass of 525 cement, and the particle size of the sand material is less than 5mm.
Preferably, the additive comprises the following components in parts by weight: 40-50 parts of calcium nitrite, 8-10 parts of naphthalene sulfonic acid formaldehyde condensate, 20-25 parts of sodium lignin sulfonate and 15-20 parts of calcium formate.
The invention also provides a preparation method of the steel bar truss bottom die, which comprises the following steps:
and mixing the bottom plate raw materials, placing the mixture in a template, placing a steel bar truss, and curing to obtain the steel bar truss bottom die.
Preferably, a mold release agent aqueous solution is sprayed in advance in the mold plate; the release agent comprises the following components in parts by mass: 5 to 7 parts of polyvinyl acetate polymer emulsion, 90 to 95 parts of emulsified paraffin wax and 0.2 to 0.7 part of dispersing wetting agent; the mass ratio of the release agent to the water in the release agent aqueous solution is 0.8-2.0: 1000.
preferably, curing is performed after spraying a curing agent, wherein the curing agent comprises the following components in parts by mass: 0.5 to 1 part of sodium carboxymethyl cellulose, 1 to 2 parts of styrene-acrylic emulsion, 0.02 to 0.03 part of EM bacteria and 97 to 98 parts of water.
The beneficial effects of the invention are as follows:
1. the invention provides a steel bar truss bottom die, which comprises a bottom plate and a steel bar truss, wherein the bottom plate is detected to obtain the apparent density of the bottom plate reaching 2.36g/cm 3 The water absorption rate is as low as 5.8%, the wet rise rate is as low as 0.02%, no damp trace or water drop appears on the bottom surface of the plate after 24h inspection, no crack or layering appears after 25 times of freeze thawing cycles in the freezing resistance test, the flexural strength ratio reaches 96%, the flexural strength ratio reaches 97.6% in the soaking-drying performance test, and the mass loss rate is as low as 8% in the combustion performance test; detecting the steel bar truss, wherein each welding point of the steel bar truss is far higher than the standard requirement of the shearing bearing capacity, and after the shearing bearing capacity detected by each welding point exceeds the standard requirement by 30%, each welding point is not welded; detecting the bottom die of the steel bar truss, and obtaining the defect that the limit value of the single-node connection tensile bearing force is up to 3360N, the surface is not affected, molten metal at the welding point is uniform, the defects of cracking, falling, cracking and the like are avoided, and the dimensional deviation of the steel bar truss and the bottom die meets the standard requirement.
2. The invention changes most working procedures with high working strength in site construction into a structure and a process which can be completed by a factory automation production line, reduces the strength of the site operation of workers, optimizes the site construction environment, is green and environment-friendly, and ensures that the whole construction period and the construction quality are controllable.
3. The invention effectively reduces the on-site supporting equipment or realizes the support-free, reduces the carbon emission in the metal production and supporting equipment process, reduces the wood formula manufacturing and wood product usage amount of the trees, saves forest resources and accords with the idea of carbon neutralization.
Drawings
Fig. 1 is a schematic structural view of a bottom mold of a steel bar truss manufactured in example 1;
wherein, 1 is a bottom plate and 2 is a steel bar truss;
fig. 2 is a schematic structural view of the steel bar truss manufactured in example 1;
wherein 3 is a stiffening steel bar, 4 is an upward rotation steel bar, 5 is a downward rotation steel bar, and 6 is a web member steel bar;
fig. 3 is a schematic structural view of a support bar according to example 1;
wherein 6 is a web member reinforcement, 7 is a support transverse reinforcement, and 8 is a support vertical reinforcement;
fig. 4 is a schematic diagram showing the front structure of the bottom die of the steel bar truss of example 1;
wherein, 1 is the bottom plate, 4 is the supination reinforcing bar, 5 is the downrotation reinforcing bar, 6 is web member reinforcing bar, 7 is the horizontal muscle of support, 8 is the vertical muscle of support.
Detailed Description
The invention provides a steel bar truss bottom die, which comprises a bottom plate 1 and a steel bar truss 2;
the steel bar truss 2 is obtained by vertically welding a plurality of single steel bar cages through a plurality of stiffening steel bars 3;
each single reinforcement cage comprises an upward rotation reinforcement 4, 2 downward rotation reinforcement 5 and a plurality of web member reinforcement 6; the upward rotation steel bars 4 and the 2 downward rotation steel bars 5 are welded with the web member steel bars 6 to form an integrated structure with isosceles triangle cross sections;
the lower part of the web member steel bar 6 is fixedly connected with the bottom plate 1.
In the invention, each single reinforcement cage preferably further comprises a plurality of support transverse ribs 7 and a plurality of support vertical ribs 8;
the support transverse ribs 7 are horizontally connected with the 2 downward-rotation steel bars 5; the upward-rotation steel bars 4 are vertically connected with the plurality of support transverse bars 7 through the plurality of support vertical bars 8.
In the invention, the number of the plurality of single reinforcement cages is preferably more than or equal to 3, more preferably more than or equal to 4, and even more preferably more than or equal to 5; the number of the plurality of reinforcing bars is preferably 7 or more, more preferably 8 or more, and even more preferably 9 or more.
In the invention, the number of the web member reinforcing bars is even.
In the present invention, the number of the plurality of support cross ribs is preferably 3 or more, more preferably 4 or more, and even more preferably 5 or more; the number of the plurality of support vertical ribs is preferably 3 or more, more preferably 4 or more, and even more preferably 5 or more.
In the present invention, the thickness of the base plate is preferably 15 to 20mm, more preferably 16 to 19mm, and still more preferably 17 to 18mm.
In the present invention, the diameter of the reinforcing bars is preferably 4 to 8mm, more preferably 5 to 7mm, and even more preferably 6mm.
In the present invention, the diameter of the upwind reinforcing bar is preferably 8 to 12mm, more preferably 9 to 11mm, and even more preferably 10mm.
In the present invention, the diameter of the downturned reinforcing bar is preferably 6 to 10mm, more preferably 7 to 9mm, and even more preferably 8mm.
In the present invention, the web reinforcement preferably has a diameter of 3 to 7mm, more preferably 4 to 6mm, and even more preferably 5mm.
In the present invention, the diameter of the support cross bar is preferably 8 to 12mm, more preferably 9 to 11mm, and even more preferably 10mm.
In the present invention, the diameter of the stand bar is preferably 8 to 12mm, more preferably 9 to 11mm, and even more preferably 10mm.
In the invention, the bottom plate is prepared from the following raw materials in parts by mass:
188-191 parts of water, 400-405 parts of 325 cement, 540-545 parts of sand material and 1260-1265 parts of stone, wherein the mass of the additive is less than or equal to 2% of the mass of 325 cement, and the particle size of the sand material is 3-5 mm.
In the present invention, the water is preferably 188 to 191 parts by mass, more preferably 189 to 190 parts by mass, and still more preferably 189.5 parts by mass.
In the present invention, the 325 cement is preferably 400 to 405 parts by mass, more preferably 401 to 404 parts by mass, and still more preferably 402 to 403 parts by mass.
In the present invention, the mass part of the sand is preferably 540 to 545 parts, more preferably 541 to 544 parts, and still more preferably 542 to 543 parts.
In the present invention, the mass part of the stone is preferably 1260 to 1265 parts, more preferably 1261 to 1264 parts, and still more preferably 1262 to 1263 parts.
In the present invention, the mass of the additive is preferably not more than 2% by mass of 325 cement, more preferably not more than 1.8% by mass of 325 cement, and still more preferably not more than 1.5% by mass of 325 cement.
In the present invention, the particle diameter of the sand is preferably 3 to 5mm, more preferably 3.5 to 4.5mm, and still more preferably 4mm.
In the invention, the bottom plate is prepared from the following raw materials in parts by mass:
173-176 parts of water, 458-463 parts of 325 cement, 510-515 parts of sand, 1248-1255 parts of stones, the mass of the additive is less than or equal to 2% of the mass of 325 cement, and the particle size of the sand is 3-5 mm.
In the present invention, the water is preferably 173 to 176 parts by mass, more preferably 174 to 175 parts by mass, and still more preferably 174.5 parts by mass.
In the present invention, the 325 cement is preferably 458 to 463 parts by mass, more preferably 459 to 462 parts by mass, and still more preferably 460 to 461 parts by mass.
In the present invention, the sand is preferably 510 to 515 parts by mass, more preferably 511 to 514 parts by mass, and still more preferably 512 to 513 parts by mass.
In the present invention, the mass part of the stone is preferably 1248 to 1255 parts, more preferably 1249 to 1254 parts, and even more preferably 1250 to 1253 parts.
In the present invention, the mass of the additive is preferably not more than 2% by mass of 325 cement, more preferably not more than 1.8% by mass of 325 cement, and still more preferably not more than 1.5% by mass of 325 cement.
In the present invention, the particle diameter of the sand is preferably 3 to 5mm, more preferably 3.5 to 4.5mm, and still more preferably 4mm.
In the invention, the bottom plate is prepared from the following raw materials in parts by mass:
163-168 parts of water, 430-433 parts of 425 cement, 550-560 parts of sand material and 1240-1250 parts of stone, wherein the mass of the additive is less than or equal to 2% of the mass of 425 cement, and the particle size of the sand material is less than 5mm.
In the present invention, the water is preferably 163 to 168 parts by mass, more preferably 164 to 167 parts by mass, and still more preferably 165 to 166 parts by mass.
In the present invention, the weight part of the 425 cement is preferably 430 to 433 parts, more preferably 431 to 432 parts, and still more preferably 431.5 parts.
In the present invention, the mass part of the sand is preferably 550 to 560 parts, more preferably 552 to 558 parts, and still more preferably 554 to 556 parts.
In the present invention, the mass part of the stone is preferably 1240 to 1250 parts, more preferably 1242 to 1248 parts, and still more preferably 1244 to 1246 parts.
In the present invention, the additive is preferably 2% by mass or less of 425 cement, more preferably 1.8% by mass or less of 425 cement, and still more preferably 1.5% by mass or less of 425 cement.
In the present invention, the particle size of the sand is preferably less than 5mm, more preferably less than 4mm, and even more preferably less than 3mm.
In the invention, the bottom plate is prepared from the following raw materials in parts by mass:
190-195 parts of water, 485-490 parts of 525 cement, 560-565 parts of sand material, 1195-1205 parts of stone, the mass of the additive is less than or equal to 2% of the mass of 525 cement, and the particle size of the sand material is less than 5mm.
In the present invention, the water is preferably 190 to 195 parts by mass, more preferably 191 to 194 parts by mass, and even more preferably 192 to 193 parts by mass.
In the present invention, the mass part of the 525 cement is preferably 485 to 490 parts, more preferably 486 to 489 parts, and still more preferably 487 to 488 parts.
In the present invention, the sand is preferably 560 to 565 parts by mass, more preferably 561 to 564 parts by mass, and still more preferably 562 to 563 parts by mass.
In the present invention, the weight parts of the stones are preferably 1195 to 1205 parts, more preferably 1198 to 1202 parts, and still more preferably 1199 to 1201 parts.
In the present invention, the additive is preferably 2% by mass or less of 525 cement, more preferably 1.8% by mass or less of 525 cement, and still more preferably 1.5% by mass or less of 525 cement.
In the present invention, the particle size of the sand is preferably less than 5mm, more preferably less than 4mm, and even more preferably less than 3mm.
In the invention, the additive preferably comprises the following components in parts by weight: 40-50 parts of calcium nitrite, 8-10 parts of naphthalene sulfonic acid formaldehyde condensate, 20-25 parts of sodium lignin sulfonate and 15-20 parts of calcium formate.
In the present invention, the weight part of the calcium nitrite is preferably 40 to 50 parts, more preferably 42 to 48 parts, and still more preferably 44 to 46 parts.
In the present invention, the mass fraction of the naphthalene sulfonic acid formaldehyde condensate is preferably 8 to 10 parts, more preferably 8.5 to 9.5 parts, and even more preferably 9 parts.
In the present invention, the sodium lignin sulfonate is preferably 20 to 25 parts by mass, more preferably 21 to 24 parts by mass, and even more preferably 22 to 23 parts by mass.
In the present invention, the mass fraction of the calcium formate is preferably 15 to 20 parts, more preferably 16 to 19 parts, and still more preferably 17 to 18 parts.
The invention also provides a preparation method of the steel bar truss bottom die, which comprises the following steps:
and mixing the bottom plate raw materials, placing the mixture in a template, placing a steel bar truss, and curing to obtain the steel bar truss bottom die.
In the invention, the manufacturing process of the steel bar truss specifically comprises the following steps: according to the field construction requirements and drawings, each steel bar in the pre-designed steel bar truss is welded and fixed to obtain the steel bar truss, the operation is completed in a factory by utilizing an automatic production line, the upper layer steel bar, the lower layer steel bar and the middle web member steel bar are welded in a spot welding mode, and the lower rotating steel bar combined with the bottom plate is reserved at the bottom of the steel bar truss.
In the invention, when the bottom plate is not solidified, the prefabricated steel bar truss is placed and compacted, at the moment, the steel bars at the lower end of the steel bar truss enter the bottom plate concrete and are compacted, and after the concrete is solidified, the bottom plate and the steel bar truss form an integrated structure.
In the invention, a mold release agent aqueous solution is sprayed in advance in a mold plate; the release agent comprises the following components in parts by mass: 5 to 7 parts of polyvinyl acetate polymer emulsion, 90 to 95 parts of emulsified paraffin wax and 0.2 to 0.7 part of dispersing wetting agent.
In the present invention, the polyvinyl acetate polymer emulsion is preferably 5 to 7 parts by mass, more preferably 5.5 to 6.5 parts by mass, and still more preferably 6 parts by mass.
In the present invention, the mass fraction of the emulsified paraffin is preferably 90 to 95 parts, more preferably 91 to 94 parts, and even more preferably 92 to 93 parts.
In the present invention, the mass fraction of the dispersing wetting agent is preferably 0.2 to 0.7 part, more preferably 0.3 to 0.6 part, and still more preferably 0.4 to 0.5 part.
In the invention, the mass ratio of the release agent to the water in the aqueous solution of the release agent is preferably 0.8-2.0: 1000, more preferably 1.0 to 1.8:1000, more preferably 1.4 to 1.6:1000.
in the invention, curing is carried out after spraying a curing agent, and the curing agent comprises the following components in parts by mass: 0.5 to 1 part of sodium carboxymethyl cellulose, 1 to 2 parts of styrene-acrylic emulsion, 0.02 to 0.03 part of EM bacteria and 97 to 98 parts of water.
In the present invention, the mass fraction of the sodium carboxymethyl cellulose is preferably 0.5 to 1 part, more preferably 0.6 to 0.9 part, and still more preferably 0.7 to 0.8 part.
In the present invention, the styrene-acrylic emulsion is preferably 1 to 2 parts by mass, more preferably 1.2 to 1.8 parts by mass, and still more preferably 1.4 to 1.6 parts by mass.
In the present invention, the mass fraction of the EM bacteria is preferably 0.02 to 0.03 part, more preferably 0.022 to 0.028 part, and still more preferably 0.024 to 0.026 part.
In the present invention, the water is preferably 97 to 98 parts by mass, more preferably 97.2 to 97.8 parts by mass, and still more preferably 97.4 to 97.6 parts by mass.
The existing concrete curing agent belongs to a high molecular water-retaining agent, the degradation period is long, the fine stone concrete bottom plate adopts the traditional curing agent, and when the curing agent is applied to floor cast-in-place concrete instead of the bottom plate, the bonding force between the bottom plate and the cast-in-place concrete is influenced (the bonding force is equivalent to a layer of high molecular isolating agent on the bottom plate).
In the invention, the finished board obtained after the maintenance is completed is demolded and cut according to the building construction specification.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Uniformly mixing 7 parts of polyvinyl acetate polymer emulsion, 90 parts of emulsified paraffin and 0.2 part of dispersing wetting agent to obtain a release agent, and dissolving 1.5kg of the release agent in 1000kg of water to obtain a release agent aqueous solution; uniformly mixing 40 parts of calcium nitrite, 10 parts of naphthalene sulfonic acid formaldehyde condensate, 20 parts of sodium lignin sulfonate and 20 parts of calcium formate to obtain an additive; uniformly mixing 0.6 part of sodium carboxymethyl cellulose, 1.2 parts of styrene-acrylic emulsion, 0.02 part of EM bacteria and 97 parts of water to obtain a curing agent;
then prefabricating through a factory automation assembly line to obtain a steel bar truss 2; after spraying a release agent on a template, mixing 400 parts of 325 cement, 545 parts of sand with the particle size of 4mm, 1265 parts of cobble, the additive accounting for 2% of the mass of the cement and 191 parts of water, putting into the template, enabling the final thickness of the bottom plate 1 to reach 15mm, placing and compacting the steel bar truss 2 when the concrete of the bottom plate 1 is not solidified, enabling the steel bar at the lower end of the steel bar truss 2 to enter the concrete and be compacted, and enabling the bottom plate 1 and the steel bar truss 2 to form an integrated structure after the concrete is solidified;
finally, spraying curing agent into the bracket for curing; and demolding the finished board obtained after curing and cutting according to the building construction specification.
The strength of the base plate 1 prepared in this example was tested to obtain the base plate 1 having a strength of 20MPa;
the apparent density, water absorption, wet expansion ratio, water impermeability, freezing resistance, soaking-drying performance and incombustibility of the base plate 1 prepared in this example were examined, wherein the apparent density and water absorption were 80×80×20 in sample size, 260×260×20 in sample size, 700×700×20 in sample size, 250×250×20 in freezing resistance test, 500×500×20 in sample size (mm in unit), and the apparent density, water absorption, wet expansion ratio, water impermeability, freezing resistance and incombustibility were examined by taking ten pieces of the steel truss base plate obtained in this example, and the soaking-drying performance was examined by taking ten pieces of the steel truss obtained in this example, respectively, and the examination results are shown in table 1:
table 1 example 1 results of floor performance test
The schematic structural diagram of the bottom die of the steel bar truss manufactured in this embodiment is shown in fig. 1, from which it can be observed that: the steel bars at the lower end of the steel bar truss 2 enter the bottom plate 1 to form an integrated structure; the structural schematic diagram of the steel bar truss manufactured in this embodiment is shown in fig. 2, from which it can be observed that: the steel bar truss 2 is formed by arranging 3 groups of steel bar cage monomers, 7 stiffening steel bars 3 are arranged perpendicular to each steel bar cage monomer, 1 upward-rotation steel bar 4 is arranged on the upper portion of each steel bar cage monomer, 2 downward-rotation steel bars 5 are arranged on the lower portion of each steel bar cage monomer, 18 web member steel bars 6 are respectively arranged on two sides of each upward-rotation steel bar 4, 2 web member steel bars 6 are in a group, the upper ends of the web member steel bars are welded on two sides of the upward-rotation steel bars 4, the lower ends of the web member steel bars are respectively welded on the 2 downward-rotation steel bars 5 and extend downwards continuously, and the welded connection is of a structure with an isosceles triangle section; when the transverse support ribs 7 and the vertical support ribs 8 are added, the structural schematic diagram of the support steel bars is shown in fig. 3, the front structural schematic diagram of the bottom die of the steel bar truss is shown in fig. 4, and it can be observed from the figure: a support transverse bar 7 is welded between every two downwards-rotated steel bars 5, and a support vertical bar 8 is arranged between the upwards-rotated steel bars 4 and the support transverse bar 7. The diameter of the stiffening steel bar is 6mm, the diameter of the upward-rotation steel bar is 10mm, the diameter of the downward-rotation steel bar is 8mm, the diameter of the web member steel bar is 5mm, and the diameters of the support vertical bars and the support horizontal bars are 10mm.
The height of the steel bar truss 2 obtained in the embodiment is measured, the obtained height of the steel bar truss 2 is 90mm, the resistance spot welding shearing resistance of the steel bar truss 2 prepared in the embodiment is detected, and the result shows that all welding spots of the steel bar truss 2 prepared in the embodiment are far higher than the shearing bearing capacity standard requirement, and all welding spots are not welded after the shearing bearing capacity detected by all welding spots is 30% higher than the shearing bearing capacity standard requirement.
The single-node connection tensile bearing capacity, appearance quality and dimensional deviation of the bottom die of the steel bar truss obtained in the embodiment are detected, and the obtained results are shown in table 2:
table 2 example 1 steel bar truss bottom die performance test results
The detection criteria are GB50204-2015, GB/T7019-2014, GB/T14402-2007/ISO1716:2002, JGJ145-2013, JG/T368-2012, GB/T5464-2010/ISO1182: 2002. GB8624-2006 shows that the judging basis of whether the steel bar truss floor support plate is qualified or not is Q/HJJC005-2020, namely the dismantling-free bottom die steel bar truss floor support plate.
Example 2
Uniformly mixing 6 parts of polyvinyl acetate polymer emulsion, 92 parts of emulsified paraffin and 0.5 part of dispersing wetting agent to obtain a release agent, and dissolving 1.7kg of the release agent in 1000kg of water to obtain a release agent aqueous solution; uniformly mixing 45 parts of calcium nitrite, 9 parts of naphthalene sulfonic acid formaldehyde condensate, 22 parts of sodium lignin sulfonate and 17 parts of calcium formate to obtain an additive; uniformly mixing 0.7 part of sodium carboxymethyl cellulose, 1.4 parts of styrene-acrylic emulsion, 0.025 part of EM bacteria and 97.5 parts of water to obtain a curing agent;
then prefabricating through a factory automation assembly line to obtain a steel bar truss; after spraying a release agent on a template, mixing 430 parts of 425 cement, 560 parts of sand with the particle size of 2mm, 1250 parts of cobble, the additive accounting for 0.9% of the mass of the cement and 168 parts of water, putting the mixture into the template, enabling the final thickness of a bottom plate to reach 17mm, placing and compacting a steel bar truss when the concrete of the bottom plate is not solidified, enabling the steel bar at the lower end of the steel bar truss to enter the concrete and be compacted, and enabling the bottom plate and the steel bar truss to form an integrated structure after the concrete is solidified;
finally, spraying curing agent into the bracket for curing; and demolding the finished board obtained after curing and cutting according to the building construction specification.
The strength of the bottom plate prepared in the embodiment is tested, and the strength of the bottom plate is 40MPa;
the performances of the base plate, the steel bar truss and the steel bar truss bottom die obtained in this example were tested by the same test method and standard as in example 1, and the apparent density of the base plate obtained in this example was 2.36g/cm 3 The water absorption is 6.0%, the humidity rise rate is 0.02%, no trace or water drop appears on the bottom surface of the plate after 24h inspection, no rupture or delamination appears after 25 times of freeze thawing cycles, and the flexural strength is improvedThe ratio is 96%, the flexural strength ratio is 97.6%, and the mass loss rate is 8%; all welding spots of the steel bar truss obtained by the embodiment are far higher than the standard requirement of the shearing bearing capacity, and all welding spots are not welded after the shearing bearing capacity detected by all welding spots is 30% higher than the standard requirement; the single node connection tensile bearing force test value of the steel bar truss bottom die obtained in the embodiment is 1500N, the limit value is 3360N, no defects affecting use are seen on the surface, molten metal at welding spots is even, defects such as cracking and falling and cracking are avoided, the size deviation node distance of the steel bar truss is 0, truss spacing is +1mm, truss height is +1mm, the size deviation length of the bottom die is +1mm, width is 0, thickness is 0, and diagonal difference is 1mm.
Example 3
Uniformly mixing 5 parts of polyvinyl acetate polymer emulsion, 94 parts of emulsified paraffin and 0.6 part of dispersing wetting agent to obtain a release agent, and dissolving 1.0kg of the release agent in 1000kg of water to obtain a release agent aqueous solution; uniformly mixing 49 parts of calcium nitrite, 8 parts of naphthalene sulfonic acid formaldehyde condensate, 24 parts of sodium lignin sulfonate and 19 parts of calcium formate to obtain an additive; uniformly mixing 0.9 part of sodium carboxymethyl cellulose, 1.8 parts of styrene-acrylic emulsion, 0.03 part of EM bacteria and 98 parts of water to obtain a curing agent;
then prefabricating through a factory automation assembly line to obtain a steel bar truss; after spraying a release agent on a template, mixing 460 parts of 325 cement, 512 parts of sand with the grain diameter of 3mm, 1253 parts of cobble, the additive accounting for 1.3% of the mass of the cement and 175 parts of water, putting the mixture into the template, enabling the final thickness of a bottom plate to reach 19mm, placing and compacting a steel bar truss when the concrete of the bottom plate is not solidified, enabling the steel bar at the lower end of the steel bar truss to enter the concrete and be compacted, and enabling the bottom plate and the steel bar truss to form an integrated structure after the concrete is solidified;
finally, spraying curing agent into the bracket for curing; and demolding the finished board obtained after curing and cutting according to the building construction specification.
The strength of the bottom plate prepared in the embodiment is tested, and the strength of the bottom plate is 30MPa;
the same detection method and standard as in example 1 were used, and the base plate obtained in this example,the performance of the steel bar truss and the steel bar truss bottom die were tested to obtain a bottom plate having an apparent density of 2.25g/cm in the present example 3 The water absorption rate is 5.9%, the wet rise rate is 0.02%, no damp trace or water drop appears on the bottom surface of the plate after 24 hours inspection, no rupture and delamination appear after 25 times of freeze thawing cycles, the flexural strength ratio is 95%, the flexural strength ratio is 97.4%, and the mass loss rate is 8%; all welding spots of the steel bar truss obtained by the embodiment are far higher than the standard requirement of the shearing bearing capacity, and all welding spots are not welded after the shearing bearing capacity detected by all welding spots is 30% higher than the standard requirement; the single node connection tensile bearing force test value of the steel bar truss bottom die obtained in the embodiment is 1500N, the limit value is 3357N, no defects affecting use are seen on the surface, molten metal at welding spots is uniform, defects such as cracking and falling and cracking are avoided, the size deviation node distance of the steel bar truss is +1mm, truss spacing is 0, truss height is +1mm, the size deviation length of the bottom die is 0, width is +1mm, thickness is +1mm, and diagonal line difference is 1mm.
From the above embodiments, the present invention provides a bottom mold for a steel bar truss, comprising a bottom plate and a steel bar truss, wherein the bottom plate is detected to obtain an apparent density of 2.36g/cm 3 The water absorption rate is as low as 5.8%, the wet rise rate is as low as 0.02%, no damp trace or water drop appears on the bottom surface of the plate after 24h inspection, no crack or layering appears after 25 times of freeze thawing cycles in the freezing resistance test, the flexural strength ratio reaches 96%, the flexural strength ratio reaches 97.6% in the soaking-drying performance test, and the mass loss rate is as low as 8% in the combustion performance test; detecting the steel bar truss, wherein each welding point of the steel bar truss is far higher than the standard requirement of the shearing bearing capacity, and after the shearing bearing capacity detected by each welding point exceeds the standard requirement by 30%, each welding point is not welded; detecting the bottom die of the steel bar truss, so that the limit value of the single-node connection tensile bearing force is up to 3360N, the surface is free from defects affecting use, molten metal at welding spots is uniform, the defects of cracking, falling, cracking and the like are avoided, and the dimensional deviation of the steel bar truss and the bottom die meets the standard requirement; the invention changes most working procedures with high working strength in site construction into structures and processes which can be completed by a factory automation production line, reduces the strength of the site operation of workers and optimizesThe construction environment on site is green and environment-friendly, so that the whole construction period and the construction quality are controllable; the method has the advantages that on-site supporting equipment is effectively reduced or supporting is avoided, carbon emission in the metal production and supporting equipment process is reduced, wood making and wood product using amount of trees are reduced, forest resources are saved, and the method accords with the idea of carbon neutralization.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (7)
1. A method for preparing a bottom die of a steel bar truss, which is characterized by comprising the following steps:
mixing the bottom plate raw materials, placing the mixture in a template, placing a steel bar truss, and curing to obtain a steel bar truss bottom die;
spraying a release agent aqueous solution in the template in advance;
the release agent comprises the following components in parts by mass: 5 to 7 parts of polyvinyl acetate polymer emulsion, 90 to 95 parts of emulsified paraffin wax and 0.2 to 0.7 part of dispersing wetting agent; the mass ratio of the release agent to the water in the release agent aqueous solution is 0.8-2.0: 1000;
curing is carried out after spraying a curing agent, wherein the curing agent comprises the following components in parts by mass: 0.5 to 1 part of sodium carboxymethyl cellulose, 1 to 2 parts of styrene-acrylic emulsion, 0.02 to 0.03 part of EM bacteria and 97 to 98 parts of water;
the steel bar truss bottom die comprises a bottom plate (1) and a steel bar truss (2);
the steel bar truss (2) is obtained by vertically welding a plurality of single steel bar cages through a plurality of stiffening steel bars (3);
each single reinforcement cage comprises an upward rotation reinforcement (4), 2 downward rotation reinforcement (5) and a plurality of web member reinforcement (6); the upper rotating steel bars (4) and the 2 lower rotating steel bars (5) are welded with the web member steel bars (6) to form an integrated structure with isosceles triangle cross sections;
the lower part of the web member steel bar (6) is fixedly connected with the bottom plate (1).
2. The method for preparing the bottom die of the steel bar truss, as claimed in claim 1, wherein the method comprises the following steps: each single reinforcement cage further comprises a plurality of support transverse ribs (7) and a plurality of support vertical ribs (8);
the support transverse ribs (7) are horizontally connected with the 2 downward-rotation steel bars (5); the upward-rotation steel bars (4) are vertically connected with the plurality of support transverse bars (7) through the plurality of support vertical bars (8).
3. The method for preparing the bottom die of the steel bar truss, as claimed in claim 1, wherein the method comprises the following steps: the number of the plurality of single reinforcement cages is more than or equal to 3, and the number of the plurality of stiffening reinforcements is more than or equal to 7.
4. A method of making a bottom form for a steel bar truss as recited in claim 2 wherein: the number of the transverse ribs of the plurality of supports is more than or equal to 3, and the number of the vertical ribs of the plurality of supports is more than or equal to 3.
5. The method for preparing the bottom die of the steel bar truss, as claimed in claim 1, wherein the method comprises the following steps: the thickness of the bottom plate is 15-20 mm.
6. The method for preparing the bottom die of the steel bar truss, as claimed in claim 5, wherein: the bottom plate is prepared from the following raw materials in parts by mass:
188-191 parts of water, 400-405 parts of 325 cement, 540-545 parts of sand material, 1260-1265 parts of stone, the mass of the additive is less than or equal to 2% of the mass of 325 cement, and the particle size of the sand material is 3-5 mm; or (b)
173-176 parts of water, 458-463 parts of 325 cement, 510-515 parts of sand material, 1248-1255 parts of stone, wherein the mass of the additive is less than or equal to 2% of the mass of 325 cement, and the particle size of the sand material is 3-5 mm; or (b)
163-168 parts of water, 430-433 parts of 425 cement, 550-560 parts of sand material and 1240-1250 parts of stone, wherein the mass of the additive is less than or equal to 2% of the mass of 425 cement, and the particle size of the sand material is less than 5mm; or (b)
190-195 parts of water, 485-490 parts of 525 cement, 560-565 parts of sand material, 1195-1205 parts of stone, the mass of the additive is less than or equal to 2% of the mass of 525 cement, and the particle size of the sand material is less than 5mm.
7. The method for preparing the bottom die of the steel bar truss, as claimed in claim 6, wherein: the additive comprises the following components in parts by mass: 40-50 parts of calcium nitrite, 8-10 parts of naphthalene sulfonic acid formaldehyde condensate, 20-25 parts of sodium lignin sulfonate and 15-20 parts of calcium formate.
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| JP3157509U (en) * | 2009-12-07 | 2010-02-18 | 松井金網工業株式会社 | Deck with truss |
| CN207211464U (en) * | 2017-08-17 | 2018-04-10 | 宝润达新型材料有限公司 | A kind of new reinforcing steel bar truss plate |
| CN110029010A (en) * | 2019-05-13 | 2019-07-19 | 山西佳维新材料股份有限公司 | A kind of aqueous release agent and preparation method thereof |
| CN114059699A (en) * | 2020-08-08 | 2022-02-18 | 浙江模卡新材料股份有限公司 | Precast concrete bottom plate integrated with truss steel bars and prestressed steel wire meshes |
| CN113754214A (en) * | 2021-09-15 | 2021-12-07 | 中建三局第一建设工程有限责任公司 | Preparation method of bottom mud covering layer of black and odorous river channel and ecological restoration method of black and odorous river channel |
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