CN111733979A - Large-span steel truss structure of cement production line - Google Patents
Large-span steel truss structure of cement production line Download PDFInfo
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- CN111733979A CN111733979A CN202010626099.1A CN202010626099A CN111733979A CN 111733979 A CN111733979 A CN 111733979A CN 202010626099 A CN202010626099 A CN 202010626099A CN 111733979 A CN111733979 A CN 111733979A
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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
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/32—Columns; Pillars; Struts of metal
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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Abstract
The invention discloses a large-span steel truss structure of a cement production line, which comprises steel beams and upright posts, wherein each steel beam comprises an upper steel beam and a lower steel beam, the two upper steel beams and the lower steel beam form an isosceles triangle steel beam main frame, and the tail ends of the upper steel beam and the lower steel beam are fixedly connected with the upper ends of the upright posts through connecting structures; the connecting structure comprises anchor bolts, channel steel, leveling nuts and fixing nuts, concrete is poured in gaps among the channel steel, the steel beams and the stand columns, and reinforcing ribs are uniformly distributed in the concrete. According to the invention, through the optimized design of the structure, the steel truss structure has high strength and rigidity, and the shear resistance, tensile strength and bearing capacity meet the requirements, even if the steel truss structure is used as a large-span steel truss structure, the steel truss structure also meets the requirements.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a steel truss structure.
Background
With the realization and the promotion of the reform open policy, the economic construction work of China is developed dramatically. During this period, the steel yield of China is the first world. The increase of steel production creates an excellent opportunity for the development of construction works for building steel structures. For public buildings such as large-span factory buildings, exhibition halls, gymnasiums and bridges, steel structure systems are commonly used, and the large-span steel structure refers to a space structure with the span of more than or equal to 60M and comprises a truss, a frame, a net rack, a net shell and the like. The truss structure is a beam member, and is a hollow crossbeam consisting of a plurality of small-section rod pieces, and the truss structure is a structure formed by connecting the rod pieces at two ends by hinges. The truss is a plane or space structure which is generally provided with triangular units and consists of straight rods, and the truss rod piece mainly bears axial tension or pressure, so that the strength of materials can be fully utilized, the material can be saved compared with a solid web beam when the span is large, the self weight is reduced, and the rigidity is increased. Because the section of the beam can be made to be very high, the beam has large bending resistance and small deflection, thereby being suitable for the span which is larger than that of a real web beam, and having the characteristics of attractive appearance, light and handy structure, reasonable stress, simple and convenient installation, practicability, durability and the like.
The existing steel truss is various in types and calculation methods, certain defects and shortcomings exist, how to reasonably optimize the structure of the steel truss, find a structural scheme meeting the actual engineering project-cement production line, and meanwhile, research out a construction technology corresponding to the optimized structure, so that the whole structure and the construction process meet the requirements of safety, reliability, high efficiency, convenience and economy, and the problem of urgent solution at present still exists.
Disclosure of Invention
The invention mainly solves the technical problem of providing a large-span steel truss structure of a cement production line, and through the structural optimization design, the steel truss structure has high strength and rigidity, and meets the requirements on shear resistance, tensile strength and bearing capacity, even if the steel truss structure is used as the large-span steel truss structure.
In order to solve the technical problems, the invention adopts a technical scheme that: the large-span steel truss structure of the cement production line is provided, the steel truss structure comprises a steel beam and an upright post, the steel beam comprises an upper steel beam and a lower steel beam, the upper steel beam is positioned above the lower steel beam, the two upper steel beams and the lower steel beam form an isosceles triangle-shaped steel beam main frame, and the tail end of the upper steel beam, the tail end of the lower steel beam and the upper end of the upright post are fixedly connected through a connecting structure;
the bottom surfaces of the tail ends of the upper steel beam and the lower steel beam are planes, the connecting structure comprises anchor bolts, channel steel, leveling nuts and fixing nuts, the number of the anchor bolts is at least four, the number of the leveling nuts and the number of the fixing nuts are the same as that of the anchor bolts, and the bottom surfaces of the tail ends of the upper steel beam and the lower steel beam are provided with holes corresponding to the anchor bolts;
the lower end of the anchor bolt is embedded into the upper part of the upright post, one leveling nut is screwed at the upper end of each anchor bolt, a pouring hole is formed in the middle position of the upper end of the upright post, the channel steel is arranged in the middle position of the bottom surface of the tail end of the steel beam, the lower end of the channel steel is inserted into the pouring hole of the upright post, the open hole in the bottom surface of the tail end of the steel beam is sleeved on the anchor bolt, the bottom surface of the tail end of the steel beam is placed on the leveling nuts, the fixing nuts are screwed on the anchor bolts and positioned above the steel beam, the distance between the steel beam and the upright post is adjusted through the leveling nuts, and the steel beam and the upright post are fixedly connected through the fixing nuts;
concrete is poured in gaps among the channel steel, the steel beam and the stand columns, reinforcing ribs are uniformly distributed in the concrete, and the volume ratio of the reinforcing ribs to the concrete is 1: (4-6), the shape of the reinforcing rib is at least three of a column bar shape, a branch shape, an I shape and a triangle;
the concrete comprises a cement composition and mixed fibers filled in the cement composition, wherein the mixed fibers comprise steel fibers, carbon fibers and polypropylene fibers, the steel fibers are in at least two shapes of strip shapes, dendritic shapes, cylindrical shapes, polygonal shapes and polyhedral shapes, the volume of the steel fibers accounts for 0.4-1.5% of the total volume of the concrete, the volume of the carbon fibers accounts for 0.2-0.4% of the total volume of the concrete, and the polypropylene fibers accounts for 0.1-0.3% of the total volume of the concrete;
the cement composition comprises the following raw materials in parts by weight: 400 parts of Portland cement, 250 parts of ceramsite, 200 parts of ceramic sand, 120 parts of gravel, 50-80 parts of silica fume, 40-60 parts of fly ash, 50-70 parts of glass beads, 15-20 parts of molecular sieve, 12-18 parts of fumed silica, 1-2 parts of rust inhibitor, 3-5 parts of anticoagulant, 3-6 parts of water reducer and 200 parts of 150 parts of water;
the maximum particle size of the elutriation sand is smaller than 2.8mm, and the maximum particle size of the broken stone is smaller than 7 mm;
the surface of the steel fiber is covered with an anticorrosive layer, the anticorrosive layer is an epoxy resin anticorrosive layer, and the thickness of the epoxy resin anticorrosive layer is 0.01-0.05 mm;
the surface of the steel fiber is an uneven rough surface;
the carbon fibers and the polypropylene fibers are both cylindrical fibers, and the surfaces of the carbon fibers and the polypropylene fibers are also uneven rough surfaces;
the aspect ratio of the carbon fiber and the polypropylene fiber is 30-80, and the diameter of the carbon fiber and the polypropylene fiber is 0.01-0.02 mm.
In order to solve the technical problems, the invention adopts the further technical scheme that: go up the girder steel and include reinforcing plate and first network structure, go up the reinforcing plate weld in first network structure, first network structure is including erecting web member, diagonal web member and lower chord, erect the web member with diagonal web member all is that one end is connected the lower chord, and the other end is connected go up the reinforcing plate.
Further, go up the steel roof beam and include reinforcing plate and second network structure down, the reinforcing plate weld in down second network structure, second network structure is including erecting web member, oblique web member and upper chord, erect the web member with oblique web member all is that one end is connected lower chord, and the other end is connected lower reinforcing plate.
Further, go up the girder steel with be equipped with additional strengthening between the girder steel down, additional strengthening is third network structure, third network structure includes montant and down tube, the montant with the down tube is connected, the down tube is alternately.
Further, the shape of the steel fiber is strip-shaped, dendritic, cylindrical and polygonal, wherein the volume ratio of the strip-shaped steel fiber to the dendritic steel fiber to the cylindrical steel fiber to the polygonal steel fiber is 1: (2-3): (2.5-3.5): (2.2-2.8).
Further, the molecular sieve is a natural zeolite molecular sieve or a synthetic zeolite molecular sieve, and the specific surface area of the molecular sieve is 500-800m2/g。
Furthermore, the holes of the upper steel beam and the lower steel beam are long round holes with the diameter phi of 25.0mm multiplied by 48 mm.
The reinforcing ribs are in the shapes of a column bar, a branch, an I-shaped shape and a triangle, and the volume ratio of the reinforcing ribs in the shapes is 1:1:1: 1.
The invention has the beneficial effects that:
the steel truss structure comprises steel beams and upright posts, wherein the steel beams comprise upper steel beams and lower steel beams, the two upper steel beams and the lower steel beams form an isosceles triangle steel beam main frame, and the tail ends of the upper steel beams, the tail ends of the lower steel beams and the upper ends of the upright posts are fixedly connected through connecting structures; connection structure includes crab-bolt, channel-section steel, leveling nut and fixation nut, concreting in the space between channel-section steel, girder steel and the stand, and through the optimal design to the steel truss structure, this steel truss structural strength is high with rigidity, and anti-shear capacity, tensile strength and bearing capacity meet the demands, even also meet the demands as large-span steel truss structure, specifically as follows:
the steel beam main frame and the stand columns are fixedly connected through a special connecting structure, the connecting structure comprises anchor bolts, channel steel, leveling nuts and fixing nuts, the levelness of the steel beam main frame and the distance between the steel beam main frame and the stand columns are adjusted by adjusting the positions of the leveling nuts, concrete is poured in gaps among the channel steel, the steel beam and the stand columns, and the strength of the steel beam main frame and the stand columns during connection is increased through the connecting structure, and the connecting structure is as follows:
1) the horizontal force between the steel beam main frame and the upright post is transmitted through the friction force between the steel beam and the upright post, if the friction force is insufficient, a shear key needs to be arranged, because the anchor bolt cannot transmit the horizontal force, and because the bottoms of the upper steel beam and the lower steel beam are provided with the openings, the horizontal thrust of the top of the upright post is reduced, namely the friction force is reduced, and the design requirement can be met without arranging the shear key;
2) according to the invention, the concrete is poured in the gaps among the channel steel, the steel beam and the upright column, so that the strength of the connecting node is enhanced, and the reinforcing ribs with different shapes are uniformly distributed in the concrete, so that the stress can be dispersed, the stress concentration in the concrete is avoided, the tensile strength and the bearing capacity of the connecting structure are improved, and the strength of the whole steel truss structure is finally improved;
secondly, the concrete of the connecting joint is filled with various fibers, wherein the steel fibers have the characteristics of good compressive strength and good bending strength, but the crack resistance effect on the concrete is not obvious, the carbon fibers have the characteristic of plastic deformation, but the cost is higher, although the strength of the polypropylene fibers can not be improved, the polypropylene fibers can prevent cracks and plastic shrinkage cracks generated by temperature change under extremely low mixing amount, the concrete of the invention fully exerts the advantages of the three fibers through the reasonable proportioning of the three fibers and the added water reducing agent, anticoagulant and the like, so that the concrete of the invention has the advantages of good compressive strength, good bending strength, plastic deformation, low cost and capability of preventing cracks and plastic shrinkage cracks generated by temperature change under extremely low mixing amount, therefore, when the connecting joint is used for a connecting structure, the stress can be dispersed, and the stress concentration in the concrete is avoided, the tensile capacity and the bearing capacity of the connecting structure are improved, and finally the strength of the whole steel truss structure is improved;
the steel fibers in the concrete of the connecting structure adopt steel fibers with various shapes, so that the stress in the concrete can be uniformly distributed and reduced, and the shear strength of the concrete is improved; the surfaces of the steel fibers, the carbon fibers and the polypropylene fibers are uneven rough surfaces, and the rough surfaces can greatly improve the binding force of the mixed fibers and the cement composition, improve the compactness, further improve the bearing capacity, the compressive strength, the bending strength and the like of concrete, and further improve the strength of the steel truss;
the upper steel beam and the lower steel beam are in structural design by matching the reinforcing plate with the net-shaped structure, so that the strength and the bearing capacity of the whole structure are improved;
and fifthly, a reinforcing structure is arranged between the upper steel beam and the lower steel beam, the number of the reinforcing structures can be designed according to the span of the steel truss structure, so that the connecting strength between the upper steel beam and the lower steel beam is improved, and the steel truss structure is particularly suitable for large-span steel truss structures.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Drawings
FIG. 1 is an external view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a top view of the connection of the present invention;
FIG. 4 is a front view of the connection structure of the present invention;
FIG. 5 is a partial structural view of the upper steel beam of the present invention;
FIG. 6 is a partial structural view of the lower steel beam of the present invention;
reference numerals for the parts indicate:
the steel beam comprises a vertical column 1, a pouring hole 11, an upper steel beam 2, an opening 21, an upper reinforcing plate 22, a vertical web member 231, a diagonal web member 232, a lower web member 233, an upper web member 234, a lower steel beam 3, a lower reinforcing plate 31, a connecting structure 4, an anchor bolt 41, a channel steel 42, a leveling nut 43, a fixing nut 44, concrete 5 and a reinforcing structure 6.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and the present invention will be described in detail with reference to the accompanying drawings. The invention may be embodied in other different forms, i.e. it is capable of various modifications and changes without departing from the scope of the invention as disclosed.
Example (b): a large-span steel truss structure of a cement production line is shown in figures 1 to 6 and comprises steel beams and upright columns 1, wherein each steel beam comprises an upper steel beam 2 and a lower steel beam 3, the upper steel beam is positioned above the lower steel beam, the two upper steel beams and the lower steel beam form an isosceles triangle steel beam main frame, and the tail ends of the upper steel beams, the tail ends of the lower steel beams and the upper ends of the upright columns are fixedly connected through connecting structures 4;
the bottom surfaces of the tail ends of the upper steel beam and the lower steel beam are planes, the connecting structure comprises anchor bolts 41, channel steel 42, leveling nuts 43 and fixing nuts 44, the number of the anchor bolts is at least four, the number of the leveling nuts and the number of the fixing nuts are the same as that of the anchor bolts, and the bottom surfaces of the tail ends of the upper steel beam and the lower steel beam are provided with open holes 21 corresponding to the anchor bolts;
the lower end of the anchor bolt is embedded into the upper part of the upright post, one leveling nut is screwed at the upper end of each anchor bolt, a pouring hole 11 is formed in the middle position of the upper end of the upright post, the channel steel is arranged in the middle position of the bottom surface of the tail end of the steel beam, the lower end of the channel steel is inserted into the pouring hole of the upright post, the open hole in the bottom surface of the tail end of the steel beam is sleeved on the anchor bolt, the bottom surface of the tail end of the steel beam is placed on the leveling nuts, the fixing nuts are screwed on the anchor bolts and positioned above the steel beam, the distance between the steel beam and the upright post is adjusted through the leveling nuts, and the steel beam and the upright post are fixedly connected through the fixing nuts;
the concrete comprises a cement composition and mixed fibers filled in the cement composition, wherein the mixed fibers comprise steel fibers, carbon fibers and polypropylene fibers, the steel fibers are in at least two shapes of strip shapes, dendritic shapes, cylindrical shapes, polygonal shapes and polyhedral shapes, the volume of the steel fibers accounts for 0.4-1.5% of the total volume of the concrete, the volume of the carbon fibers accounts for 0.2-0.4% of the total volume of the concrete, and the polypropylene fibers accounts for 0.1-0.3% of the total volume of the concrete;
the cement composition comprises the following raw materials in parts by weight: 400 parts of Portland cement, 250 parts of ceramsite, 200 parts of ceramic sand, 120 parts of gravel, 50-80 parts of silica fume, 40-60 parts of fly ash, 50-70 parts of glass beads, 15-20 parts of molecular sieve, 12-18 parts of fumed silica, 1-2 parts of rust inhibitor, 3-5 parts of anticoagulant, 3-6 parts of water reducer and 200 parts of 150 parts of water;
the maximum particle size of the elutriation sand is smaller than 2.8mm, and the maximum particle size of the broken stone is smaller than 7 mm;
the surface of the steel fiber is covered with an anticorrosive layer, the anticorrosive layer is an epoxy resin anticorrosive layer, and the thickness of the epoxy resin anticorrosive layer is 0.01-0.05 mm;
the surface of the steel fiber is an uneven rough surface;
the carbon fibers and the polypropylene fibers are both cylindrical fibers, and the surfaces of the carbon fibers and the polypropylene fibers are also uneven rough surfaces;
the aspect ratio of the carbon fiber and the polypropylene fiber is 30-80, and the diameter of the carbon fiber and the polypropylene fiber is 0.01-0.02 mm.
The cement composition of the embodiment has a reasonable formula, the performance of a gel part of concrete is greatly optimized, the toughness and the strength of the cement can be improved by the portland cement, and the bonding performance between the concrete and other components can be improved; meanwhile, by adding auxiliary materials such as broken stone, silica fume, fly ash and the like, although the auxiliary materials are common auxiliary materials, through integral optimization, the cost of the concrete is reduced, and the mechanical property and the adhesive property of the concrete are improved; through the added ceramsite, ceramic sand, glass beads, fumed silica and molecular sieve, the hollow or voided structure of the three materials and the hygroscopicity of the fumed silica and the molecular sieve can be fully utilized to properly absorb the moisture in the cement composition, and the moisture is released to continue the hydration action when the moisture of the concrete is insufficient for a period of time, so that the self-shrinkage of the concrete is reduced, and the concrete becomes dense and the impermeability is improved due to the full hydration action; more preferably, the water reducing agent has high water reducing rate, good dispersibility, small slump loss and environmental protection.
In this embodiment, the upper steel beam includes reinforcing plate 22 and first network structure, the upper reinforcing plate weld in first network structure, first network structure is including erecting web member 231, oblique web member 232 and lower chord 233, erect the web member with oblique web member all is that one end is connected the lower chord, and the other end is connected the upper reinforcing plate.
The girder steel includes reinforcing plate 31 and second network structure down, the reinforcing plate weld down in second network structure, second network structure is including erecting web member 231, oblique web member 232 and last chord 234, erect the web member with oblique web member all is that one end is connected lower chord, and the other end is connected lower reinforcing plate.
Preferably, a reinforcing structure 6 is arranged between the upper steel beam and the lower steel beam, the reinforcing structure is a third net-shaped structure, the third net-shaped structure comprises a vertical rod and an inclined rod, the vertical rod is connected with the inclined rod, and the inclined rod is crossed. The number of the reinforcing structures can be designed according to the width of the lower steel beam.
In this embodiment, the shape of the steel fiber is a long strip, a dendritic shape, a cylindrical shape, and a polygonal shape, wherein the volume ratio of the long strip steel fiber, the dendritic steel fiber, the cylindrical steel fiber, and the polygonal steel fiber is 1: (2-3): (2.5-3.5): (2.2-2.8).
The molecular sieve is a natural zeolite molecular sieve or a synthetic zeolite molecular sieve, and the specific surface area of the molecular sieve is 500-800m2/g。
The holes of the upper steel beam and the lower steel beam are long round holes with phi of 25.0mm and 48 mm.
For example, in this embodiment, the reinforcing ribs are in the shapes of a bar, a branch, an i-shape, and a triangle, and the volume ratio of the reinforcing ribs in the shapes is 1:1:1: 1.
In the embodiment, the depth of the anchor bolt embedded into the upright post is 14-19 times of the diameter of the anchor bolt; the diameter of crab-bolt is 23mm, the height of channel-section steel is 120mm, length is 120mm and width is 50mm, the wall thickness of channel-section steel is 8mm, the degree of depth of pouring the hole is 80mm, length is 120mm and width is 100mm, the up end of stand with the perpendicular distance of the terminal bottom surface of girder steel is 60 mm.
The epoxy resin antirust layer comprises the following raw materials in percentage by weight: 35-45% of epoxy resin, 13-15% of toughening agent, 20-30% of antirust agent, 15-20% of silane coupling agent, 3-5% of polyamide curing agent and 4-6% of cardanol curing agent.
The ceramsite is at least one selected from bauxite ceramsite sand, clay ceramsite and shale ceramsite.
The water reducing agent is a polycarboxylic acid high-performance water reducing agent, the bulk density of the polycarboxylic acid high-performance water reducing agent is 500-550g/L, the ignition loss is more than or equal to 85 wt%, the chloride ion content is less than or equal to 0.1 wt%, the fluidity of cement paste is more than or equal to 240mm, and the water reducing rate of mortar is more than or equal to 20%.
The polycarboxylic acid high-performance water reducer is a polycarboxylic acid water reducer with the model number of PM109 of Zhengzhou Saizu chemical product Limited.
The anticoagulant is one or more of a sodium polyphosphate mixture, a potassium polyphosphate mixture and a calcium polyphosphate mixture.
The rough surface is uneven, namely circular arc-shaped pits are distributed, and the depth of each pit is 0.1-0.2 times of the thickness or the diameter of the steel fiber.
The formula for pouring concrete in the gap between the channel steel, the steel beam and the upright column comprises the following embodiments:
the formulations of the epoxy resin rust preventive layers of examples 1 to 5 and the formulations of the concrete are shown in Table 1 and Table 2, respectively.
Table 2:
| example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Portland cement (cement) | 300 | 320 | 340 | 360 | 400 |
| Haydite (share) | 200 | 210 | 220 | 230 | 250 |
| Ceramic sand (share) | 150 | 160 | 170 | 180 | 200 |
| Broken stone (share) | 100 | 102 | 120 | 110 | 108 |
| Silica fume (share) | 50 | 60 | 70 | 75 | 80 |
| Flyash (share) | 50 | 45 | 40 | 55 | 60 |
| Glass micro bead (share) | 60 | 50 | 55 | 65 | 70 |
| Molecular sieve (fraction) | 18 | 15 | 16 | 17 | 20 |
| Fumed silica (parts) | 15 | 12 | 16 | 17 | 18 |
| Rust inhibitor (parts) | 1.5 | 1 | 1.2 | 1.8 | 2 |
| Anticoagulant (powder) | 4 | 3 | 3.5 | 4.5 | 5 |
| Water reducing agent (share) | 3 | 4 | 5 | 5.5 | 6 |
| Water (share) | 150 | 180 | 170 | 190 | 200 |
Remarking: in examples 1 and 2, the volume of the steel fiber accounts for 0.4 percent of the total volume of the concrete, the volume of the carbon fiber accounts for 0.4 percent of the total volume of the concrete, and the volume of the polypropylene fiber accounts for 0.3 percent of the total volume of the concrete; wherein the volume ratio of the strip-shaped steel fibers, the dendritic steel fibers, the cylindrical steel fibers and the polygonal steel fibers is 1: 2: 2.5: 2.8 of;
in examples 3 and 4, the volume of the steel fiber accounts for 1.0 percent of the total volume of the concrete, the volume of the carbon fiber accounts for 0.3 percent of the total volume of the concrete, and the volume of the polypropylene fiber accounts for 0.2 percent of the total volume of the concrete; wherein the volume ratio of the strip-shaped steel fibers, the dendritic steel fibers, the cylindrical steel fibers and the polygonal steel fibers is 1: 3: 3: 2.5;
in example 5, the volume of the steel fibers accounts for 1.5 percent of the total volume of the concrete, the volume of the carbon fibers accounts for 0.2 percent of the total volume of the concrete, and the volume of the polypropylene fibers accounts for 0.1 percent of the total volume of the concrete; wherein the volume ratio of the strip-shaped steel fibers, the dendritic steel fibers, the cylindrical steel fibers and the polygonal steel fibers is 1: 2.5: 3.5: 2.2.
the method for manufacturing the composite concrete containing the mixed fibers in the embodiments 1 to 5 comprises the following steps:
step one, placing steel fibers in a raw material liquid for forming an epoxy resin antirust layer, stirring for 5-10min to enable the surfaces of the steel fibers to be uniformly coated with the raw material liquid, and then drying for 10-15min at the temperature of 90-140 ℃;
step two, uniformly mixing ceramsite, ceramic sand, glass beads, molecular sieve, fumed silica and half of water, and soaking until the glass beads, the molecular sieve and the fumed silica fully absorb water;
and step three, mixing the rest materials in the cement composition raw material formula with the mixture prepared in the step two, simultaneously adding the carbon fibers, the polypropylene fibers and the steel fibers prepared in the step one, and uniformly stirring and mixing to obtain the concrete.
The concrete prepared according to the method and the formula comprises the cement composition and the mixed fibers filled in the cement composition, wherein the mixed fibers comprise steel fibers, carbon fibers and polypropylene fibers, the steel fibers are at least two of strip-shaped, dendritic, cylindrical, polygonal and polyhedral, and the formula of the cement composition is reasonably designed, so that the concrete has good comprehensive performance, not only has the advantages of good erosion resistance and good impermeability, but also has strong tensile strength, good plastic shrinkage capacity, good bending resistance and bearing capacity and long service life.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (8)
1. The utility model provides a cement manufacture line large-span steel truss structure which characterized in that: the steel truss structure comprises steel beams and upright columns (1), the steel beams comprise upper steel beams (2) and lower steel beams (3), the upper steel beams are positioned above the lower steel beams, the two upper steel beams and the lower steel beams form an isosceles triangle steel beam main frame, and the tail ends of the upper steel beams, the tail ends of the lower steel beams and the upper ends of the upright columns are fixedly connected through connecting structures (4);
the bottom surfaces of the tail ends of the upper steel beam and the lower steel beam are planes, the connecting structure comprises anchor bolts (41), channel steel (42), leveling nuts (43) and fixing nuts (44), the number of the anchor bolts is at least four, the number of the leveling nuts and the number of the fixing nuts are the same as that of the anchor bolts, and the bottom surfaces of the tail ends of the upper steel beam and the lower steel beam are provided with holes (21) corresponding to the anchor bolts;
the lower end of the anchor bolt is embedded into the upper part of the stand column, one leveling nut is screwed at the upper end of each anchor bolt, a pouring hole (11) is formed in the middle position of the upper end of the stand column, the channel steel is arranged in the middle position of the bottom surface of the tail end of the steel beam, the lower end of the channel steel is inserted into the pouring hole of the stand column, the open hole in the bottom surface of the tail end of the steel beam is sleeved on the anchor bolt, the bottom surface of the tail end of the steel beam is placed on the leveling nuts, the fixing nuts are screwed on the anchor bolts and positioned above the steel beam, the distance between the steel beam and the stand column is adjusted through the leveling nuts, and the steel beam and the stand column are fixedly connected through the fixing;
concrete (5) is poured in the gap between the channel steel, the steel beam and the stand, reinforcing ribs are uniformly distributed in the concrete, and the volume ratio of the reinforcing ribs to the concrete is 1: (4-6), the shape of the reinforcing rib is at least three of a column bar shape, a branch shape, an I shape and a triangle;
the concrete comprises a cement composition and mixed fibers filled in the cement composition, wherein the mixed fibers comprise steel fibers, carbon fibers and polypropylene fibers, the steel fibers are in at least two shapes of strip shapes, dendritic shapes, cylindrical shapes, polygonal shapes and polyhedral shapes, the volume of the steel fibers accounts for 0.4-1.5% of the total volume of the concrete, the volume of the carbon fibers accounts for 0.2-0.4% of the total volume of the concrete, and the polypropylene fibers accounts for 0.1-0.3% of the total volume of the concrete;
the cement composition comprises the following raw materials in parts by weight: 400 parts of Portland cement, 250 parts of ceramsite, 200 parts of ceramic sand, 120 parts of gravel, 50-80 parts of silica fume, 40-60 parts of fly ash, 50-70 parts of glass beads, 15-20 parts of molecular sieve, 12-18 parts of fumed silica, 1-2 parts of rust inhibitor, 3-5 parts of anticoagulant, 3-6 parts of water reducer and 200 parts of 150 parts of water;
the maximum particle size of the elutriation sand is smaller than 2.8mm, and the maximum particle size of the broken stone is smaller than 7 mm;
the surface of the steel fiber is covered with an anticorrosive layer, the anticorrosive layer is an epoxy resin anticorrosive layer, and the thickness of the epoxy resin anticorrosive layer is 0.01-0.05 mm;
the surface of the steel fiber is an uneven rough surface;
the carbon fibers and the polypropylene fibers are both cylindrical fibers, and the surfaces of the carbon fibers and the polypropylene fibers are also uneven rough surfaces;
the aspect ratio of the carbon fiber and the polypropylene fiber is 30-80, and the diameter of the carbon fiber and the polypropylene fiber is 0.01-0.02 mm.
2. The cement production line large-span steel truss structure of claim 1, wherein: go up the girder includes reinforcing plate (22) and first network structure, it welds in to go up the reinforcing plate first network structure, first network structure is including erecting web member (231), oblique web member (232) and lower chord member (233), erect the web member with oblique web member all is that one end is connected the lower chord member, and the other end is connected go up the reinforcing plate.
3. The cement production line large-span steel truss structure of claim 1, wherein: the girder steel includes reinforcing plate (31) and second network structure down, the reinforcing plate weld down in second network structure, second network structure is including erecting web member (231), oblique web member (232) and upper chord member (234), erect the web member with oblique web member all is that one end is connected the lower chord member, and the other end is connected lower reinforcing plate.
4. The cement production line large-span steel truss structure of claim 1, wherein: go up the girder steel with be equipped with additional strengthening (6) down between the girder steel, additional strengthening is third network structure, third network structure includes montant and down tube, the montant with the down tube is connected, the down tube is alternately.
5. The cement production line large-span steel truss structure of claim 1, wherein: the steel fiber is in the shape of a long strip, a tree, a column and a polygon, wherein the volume ratio of the long strip steel fiber to the tree to the column to the polygon is 1: (2-3): (2.5-3.5): (2.2-2.8).
6. The cement production line large-span steel truss structure of claim 1, wherein: the molecular sieve is a natural zeolite molecular sieve or a synthetic zeolite molecular sieve, and the specific surface area of the molecular sieve is 500-800m2/g。
7. The cement production line large-span steel truss structure of claim 1, wherein: the holes of the upper steel beam and the lower steel beam are long round holes with phi of 25.0mm and 48 mm.
8. The cement production line large-span steel truss structure of claim 1, wherein: the reinforcing ribs are in the shapes of a columnar strip, a branch, an I-shaped shape and a triangle, and the volume ratio of the reinforcing ribs in the shapes is 1:1:1: 1.
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