CN114960929A - Large-span special-shaped fair-faced concrete structure and construction method thereof - Google Patents
Large-span special-shaped fair-faced concrete structure and construction method thereof Download PDFInfo
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- CN114960929A CN114960929A CN202210492931.2A CN202210492931A CN114960929A CN 114960929 A CN114960929 A CN 114960929A CN 202210492931 A CN202210492931 A CN 202210492931A CN 114960929 A CN114960929 A CN 114960929A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
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- 239000002994 raw material Substances 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910021389 graphene Inorganic materials 0.000 claims description 13
- 239000011398 Portland cement Substances 0.000 claims description 12
- 229910021536 Zeolite Inorganic materials 0.000 claims description 12
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 12
- 239000010881 fly ash Substances 0.000 claims description 12
- 239000010440 gypsum Substances 0.000 claims description 12
- 229910052602 gypsum Inorganic materials 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000010457 zeolite Substances 0.000 claims description 12
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
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- 239000002253 acid Substances 0.000 claims description 8
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- 150000003839 salts Chemical class 0.000 claims description 8
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000004826 seaming Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
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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
- E04B1/02—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements
- E04B1/04—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements the elements consisting of concrete, e.g. reinforced concrete, or other stone-like material
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
- C04B14/024—Graphite
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/0093—Aluminates
-
- 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
-
- 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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/68—Sealings of joints, e.g. expansion joints
- E04B1/6801—Fillings therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- 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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- Physics & Mathematics (AREA)
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Abstract
The invention relates to the technical field of concrete, and discloses a large-span special-shaped fair-faced concrete structure and a construction method thereof. According to the large-span special-shaped fair-faced concrete structure and the construction method thereof, the strength of a special-shaped part is high, the special-shaped part is not easy to break, automatic joint filling is realized when a gap appears, the performance of a concrete slab is improved, and the construction efficiency is improved by the construction method.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a large-span special-shaped fair-faced concrete structure and a construction method thereof.
Background
The building is a general name of buildings and structures, and is an artificial environment created by using the grasped substance technical means and applying certain scientific laws and aesthetic rules in order to meet the needs of social life of people. The basic idea is that after concrete is poured, no material such as coating, tile sticking, stone sticking and the like is needed, and a plain-color method of concrete is expressed. However, a waterproof protective film may be sprayed on the surface of the substrate due to fear of being saturated or deteriorated by rainwater.
The existing fair-faced concrete structure, particularly the large-span special-shaped fair-faced concrete, has the problem that cracks are easy to appear due to the large span, and therefore the large-span special-shaped fair-faced concrete structure and the construction method thereof are provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a large-span special-shaped fair-faced concrete structure and a construction method thereof, which have the advantages of high strength at special-shaped positions, difficulty in fracture, automatic crack filling when cracks appear, improvement on the performance of concrete slabs and the like, and solve the problem of quality defects of cracks and the like easily appearing in the existing fair-faced concrete structure.
(II) technical scheme
In order to realize the purposes of high strength and difficult fracture at the special-shaped part, automatic joint filling when a gap appears and performance improvement of a concrete slab, the invention provides the following technical scheme: large-span dysmorphism clear water concrete structure, including the concrete plate body, the concrete plate body includes first bracing piece and the second bracing piece at both ends, first bracing piece cooperatees with the second bracing piece, the concrete plate body embeds there are last framework of steel reinforcement and lower framework of steel reinforcement, go up framework of steel reinforcement and be connected with the third bracing piece down between the framework of steel reinforcement, the dysmorphism district of concrete plate body is provided with seam mechanism, seam mechanism includes hollow auxiliary rod, the inside packing of auxiliary rod has the seam crossing agent, and the both ends of auxiliary rod are fixed respectively on adjacent third bracing piece, and the lantern ring has been cup jointed at the middle part of auxiliary rod, be fixed with supplementary side lever on the lantern ring, the other end of supplementary side lever is fixed at last framework of steel reinforcement, the lantern ring is fixed with the section on being close to one side inner wall of supplementary side lever.
Preferably, the first support rod extends to the inside of the concrete slab body, and the extending end is provided with an elastic head.
Preferably, the elastic head comprises two arc ends, two U-shaped connecting ends and a locking screw, the two U-shaped connecting ends are respectively positioned at the two ends of the arc ends and are integrally formed with the arc ends, and one end of the U-shaped connecting end, which is far away from the arc ends, is fixed on the concrete plate body through the locking screw.
Preferably, the concrete slab body comprises the following raw materials in parts by weight: 200 parts of Portland cement, 200 parts of pebbles, 300 parts of zeolite powder, 350 parts of fly ash, 8-15 parts of polyvinyl alcohol fiber, 10-20 parts of desulfurized gypsum, 20-25 parts of graphene oxide, 50-120 parts of nano modified geopolymer, 2-3 parts of sodium spongy salt, 3-5 parts of polycarboxylic acid water reducer and 60-100 parts of water.
Preferably, the concrete slab body comprises the following raw materials in parts by weight: 200 parts of portland cement, 240 parts of pebbles, 15 parts of zeolite powder, 280 parts of fly ash, 10 parts of polyvinyl alcohol fibers, 15 parts of desulfurized gypsum, 22 parts of graphene oxide, 80 parts of nano modified geopolymer, 3 parts of sodium spongy salt, 5 parts of polycarboxylic acid water reducing agent and 70 parts of water.
Preferably, the concrete slab body comprises the following raw materials in parts by weight: 180 parts of Portland cement, 260 parts of pebbles, 15 parts of zeolite powder, 300 parts of fly ash, 12 parts of polyvinyl alcohol fibers, 15 parts of desulfurized gypsum, 22 parts of graphene oxide, 90 parts of nano modified geopolymer, 3 parts of sodium spongy salt, 5 parts of polycarboxylic acid water reducing agent and 80 parts of water.
Preferably, the two ends of the auxiliary rod are movably sleeved with connecting end posts, one ends of the connecting end posts are fixed on the adjacent third supporting rods, the other ends of the connecting end posts are fixed with sharp blades, and the sharp blades are inserted into the inner wall of the auxiliary rod.
Preferably, the tip of the pointed blade extends to the outside of the auxiliary bar.
Preferably, a positioning block is arranged in the middle of the outer side of the arc end, and a positioning groove matched with the positioning block is formed in the second supporting rod.
A construction method of a large-span special-shaped fair-faced concrete structure comprises the following steps:
s1, placing portland cement, zeolite powder, fly ash, graphene oxide, pebbles and desulfurized gypsum into a crushing grinder to treat for 25-40min, and baking at 80-140 ℃ for 10-15 min; transferring to a stirrer after baking, adding water, mixing and stirring, adding other raw materials after stirring for 5min, and continuing stirring until the raw materials are completely mixed;
s2, assembling the upper steel bar framework, the lower steel bar framework and the connecting pieces thereof with the template;
s3, pouring the concrete mixed in the S1 into the template assembled in the S2, carrying out layered blanking, controlling the thickness of each layer to be 500 +/-20 mm, and carrying out pouring molding to obtain a large-span special-shaped fair-faced concrete structure;
s4, curing the large-span special-shaped clear water concrete structure in the S3 until the structure reaches the specified strength, disassembling the formwork, connecting two ends of a concrete plate body through a first supporting rod and a second supporting rod, pouring joints among wallboards by a formwork-free spraying process, and standing for 1-2d to finish construction.
(III) advantageous effects
Compared with the prior art, the invention provides a large-span special-shaped fair-faced concrete structure and a construction method thereof, and the large-span special-shaped fair-faced concrete structure has the following beneficial effects:
1. this special-shaped clear water concrete structure of large-span, when special-shaped department when external force crack appears, the auxiliary rod among the joint mechanism can be cut by section or sharp blade, and the jointing agent flows through the fracture department, carries out the crack filling to fracture department, and automatic inside crack filling prolongs the life of special-shaped clear water concrete structure of large-span.
2. This special-shaped clear water concrete structure of large-span, when connecting the concrete plate body, the accessible inserts the one end of waiting to connect the second bracing piece of concrete plate body with the elastic head on the first bracing piece to lock fixedly through locking screw, the elastic head can play the effect of firm junction stability after fixed, improves the bulk strength of connecting back concrete plate body.
3. According to the large-span special-shaped fair-faced concrete structure, the added graphene oxide in the raw materials of the concrete plate body can reduce the hydration difficulty of the concrete, the hydration reaction rate is increased, the raw material particles are contacted more tightly, so that the overall compression strength and the bending strength of the formed concrete are increased, the nano modified geopolymer also has the advantages of improving the density of the concrete and the like, and the concrete has the characteristics of high temperature resistance and corrosion resistance.
4. The construction method of the large-span special-shaped fair-faced concrete structure is simple to operate and improves construction efficiency.
Drawings
FIG. 1 is a schematic structural view of a large-span special-shaped fair-faced concrete structure and a construction method thereof, which are provided by the invention;
FIG. 2 is a schematic structural diagram of a joint mechanism in the large-span special-shaped fair-faced concrete structure and the construction method thereof provided by the invention.
In the figure: 1. a first support bar; 2. a first support bar; 3. a second support bar; 4. a steel bar framework is arranged; 5. a steel bar framework is arranged; 6. a third support bar; 7. a seaming mechanism; 71. an auxiliary lever; 72. a jointing agent; 73. a collar; 74. an auxiliary side lever; 75. slicing; 76. connecting the end posts; 77. a sharp blade; 8. an elastic head; 81. an arc end; 82. a U-shaped connection end; 83. locking the screw; 9. and (5) positioning the blocks.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the large-span special-shaped bare concrete structure comprises a concrete slab body 1, the concrete slab body 1 comprises a first supporting rod 2 and a second supporting rod 3 at two ends, the first supporting rod 2 is matched with the second supporting rod 3, the first supporting rod 2 extends to the interior of the concrete slab body 1, and the extending end is provided with an elastic head 8, the elastic head 8 comprises an arc end 81, a U-shaped connecting end 82 and a locking screw 83, the two U-shaped connecting ends 82 are respectively positioned at the two ends of the arc end 81, and with circular arc end 81 integrated into one piece, the one end that circular arc end 81 was kept away from to U-shaped link 82 passes through locking screw 83 to be fixed on concrete plate body 1, and the outside middle part of circular arc end 81 is provided with locating piece 9, has seted up the constant head tank with locating piece 9 matched with on the second bracing piece 3, and concrete plate body 1 embeds has last framework of steel reinforcement 4 and lower framework of steel reinforcement 5, goes up framework of steel reinforcement 4 and is connected with third bracing piece 6 between the framework of steel reinforcement 5 down.
When connecting concrete plate body 1, the accessible inserts the one end of waiting to connect concrete plate body 1's second bracing piece 3 with the elastic head 8 on the first bracing piece 2 to lock fixedly through locking screw 83, elastic head 8 can play the effect of firm junction stability after fixed, improve the bulk strength of connecting back concrete plate body 1.
Example two
Referring to fig. 2, a seaming mechanism 7 is disposed in a special-shaped area of a concrete slab 1, the seaming mechanism 7 includes a hollow auxiliary rod 71, a seaming agent 72 is filled in the auxiliary rod 71, two ends of the auxiliary rod 71 are respectively fixed on adjacent third support rods 6, a collar 73 is sleeved on the middle portion of the auxiliary rod 71, an auxiliary side rod 74 is fixed on the collar 73, the other end of the auxiliary side rod 74 is fixed on the upper reinforcement frame 4, a cutting piece 75 is fixed on an inner wall of one side of the collar 73 close to the auxiliary side rod 74, a connecting end post 76 is movably sleeved on both ends of the auxiliary rod 71, one end of the connecting end post 76 is fixed on the close third support rod 6, a sharp blade 77 is fixed on the other end, the sharp blade 77 is inserted into an inner wall of the auxiliary rod 71, and a knife tip of the sharp blade 77 extends to the outer side of the auxiliary rod 71.
When the irregular part cracks due to external force and the upper part is broken due to stress, the auxiliary side rod 74 is extruded, the slicing piece 75 cuts the auxiliary rod 71, the jointing agent 72 flows out to automatically mend the crack, when the irregular part cracks towards two sides due to stress, the third supporting rod 6 moves along with the connecting end column 76, the sharp blade 77 cuts the side wall of the auxiliary rod 71, and the jointing agent 72 flows out through the crack to mend the crack.
EXAMPLE III
The large-span special-shaped fair-faced concrete structure comprises a concrete plate body 1, wherein the raw materials of the concrete plate body 1 comprise the following raw materials in parts by weight: 200 parts of portland cement, 240 parts of pebbles, 15 parts of zeolite powder, 280 parts of fly ash, 10 parts of polyvinyl alcohol fibers, 15 parts of desulfurized gypsum, 22 parts of graphene oxide, 80 parts of nano modified geopolymer, 3 parts of sodium spongy salt, 5 parts of polycarboxylic acid water reducing agent and 70 parts of water.
The construction method of the large-span special-shaped fair-faced concrete structure comprises the following steps:
s1, placing portland cement, zeolite powder, fly ash, graphene oxide, pebbles and desulfurized gypsum into a crushing grinder to be treated for 40min, and baking for 10 min at the temperature of 120 ℃; transferring to a stirrer after baking, adding water, mixing and stirring, adding other raw materials after stirring for 5min, and continuing stirring until the raw materials are completely mixed;
s2, assembling the upper steel bar framework 4, the lower steel bar framework 5 and the connecting pieces thereof with the template;
s3, pouring the mixed concrete in the S1 into the assembled template in the S2, carrying out layered blanking, controlling the thickness of each layer to be 500 mm, and carrying out pouring forming to obtain the large-span special-shaped fair-faced concrete structure;
s4, maintaining the long-span special-shaped clear water concrete structure in the S3 until the structure reaches the designated strength, detaching the formwork, connecting the two ends of the concrete plate body 1 through the first supporting rod 2 and the second supporting rod 3, pouring the joints between the wallboards by using a sprayed concrete formwork-free process, and standing for 2d to finish construction.
Example four
The large-span special-shaped fair-faced concrete structure comprises a concrete plate body 1, wherein the raw materials of the concrete plate body 1 comprise the following raw materials in parts by weight: 180 parts of Portland cement, 260 parts of pebbles, 15 parts of zeolite powder, 300 parts of fly ash, 12 parts of polyvinyl alcohol fibers, 15 parts of desulfurized gypsum, 22 parts of graphene oxide, 90 parts of nano modified geopolymer, 3 parts of sodium spongy salt, 5 parts of polycarboxylic acid water reducing agent and 80 parts of water.
The construction method of the large-span special-shaped fair-faced concrete structure comprises the following steps:
s1, placing portland cement, zeolite powder, fly ash, graphene oxide, pebbles and desulfurized gypsum into a crushing grinder to be treated for 40min, and baking for 10 min at the temperature of 120 ℃; transferring to a stirrer after baking, adding water, mixing and stirring, adding other raw materials after stirring for 5min, and continuing stirring until the raw materials are completely mixed;
s2, assembling the upper steel bar framework 4, the lower steel bar framework 5 and the connecting pieces thereof with the template;
s3, pouring the concrete mixed in the S1 into the template assembled in the S2, carrying out layered blanking, controlling the thickness of each layer to be 500 mm, and carrying out pouring molding to obtain a large-span special-shaped fair-faced concrete structure;
s4, maintaining the long-span special-shaped clear water concrete structure in the S3 until the structure reaches the designated strength, detaching the formwork, connecting the two ends of the concrete plate body 1 through the first supporting rod 2 and the second supporting rod 3, pouring the joints between the wallboards by using a sprayed concrete formwork-free process, and standing for 2d to finish construction.
Claims (10)
1. The large-span special-shaped fair-faced concrete structure comprises a concrete plate body (1), and is characterized in that the concrete plate body (1) comprises a first supporting rod (2) and a second supporting rod (3) at two ends, the first supporting rod (2) is matched with the second supporting rod (3), an upper steel reinforcement framework (4) and a lower steel reinforcement framework (5) are arranged in the concrete plate body (1), a third supporting rod (6) is connected between the upper steel reinforcement framework (4) and the lower steel reinforcement framework (5), a seaming mechanism (7) is arranged in a special-shaped area of the concrete plate body (1), the seaming mechanism (7) comprises a hollow auxiliary rod (71), a seaming agent (72) is filled in the auxiliary rod (71), two ends of the auxiliary rod (71) are respectively fixed on the adjacent third supporting rods (6), a lantern ring (73) is sleeved in the middle of the auxiliary rod (71), be fixed with supplementary side lever (74) on the lantern ring (73), the other end of supplementary side lever (74) is fixed at last framework of reinforcement (4), be fixed with section (75) on the lantern ring (73) is close to one side inner wall of supplementary side lever (74).
2. Large span profiled fair-faced concrete structure according to claim 1, characterized in that the first support bar (2) extends to the inside of the concrete slab (1) and the extending end is provided with an elastic head (8).
3. The large-span special-shaped fair-faced concrete structure as claimed in claim 2, wherein the elastic head (8) comprises two circular arc ends (81), two U-shaped connecting ends (82) and locking screws (83), the two U-shaped connecting ends (82) are respectively located at two ends of the circular arc ends (81) and are integrally formed with the circular arc ends (81), and one ends of the U-shaped connecting ends (82) far away from the circular arc ends (81) are fixed on the concrete plate body (1) through the locking screws (83).
4. The large-span special-shaped bare concrete structure according to claim 1, wherein the raw materials of the concrete slab body (1) comprise the following raw materials in parts by weight: 200 parts of Portland cement, 200 parts of pebbles, 300 parts of zeolite powder, 350 parts of fly ash, 8-15 parts of polyvinyl alcohol fiber, 10-20 parts of desulfurized gypsum, 20-25 parts of graphene oxide, 50-120 parts of nano modified geopolymer, 2-3 parts of sodium spongy salt, 3-5 parts of polycarboxylic acid water reducer and 60-100 parts of water.
5. The large-span special-shaped bare concrete structure according to claim 4, wherein the raw materials of the concrete slab body (1) comprise the following raw materials in parts by weight: 200 parts of portland cement, 240 parts of pebbles, 15 parts of zeolite powder, 280 parts of fly ash, 10 parts of polyvinyl alcohol fibers, 15 parts of desulfurized gypsum, 22 parts of graphene oxide, 80 parts of nano modified geopolymer, 3 parts of sodium spongy salt, 5 parts of polycarboxylic acid water reducing agent and 70 parts of water.
6. The large-span special-shaped bare concrete structure according to claim 1, wherein the raw materials of the concrete slab body (1) comprise the following raw materials in parts by weight: 180 parts of Portland cement, 260 parts of pebbles, 15 parts of zeolite powder, 300 parts of fly ash, 12 parts of polyvinyl alcohol fibers, 15 parts of desulfurized gypsum, 22 parts of graphene oxide, 90 parts of nano modified geopolymer, 3 parts of sodium spongy salt, 5 parts of polycarboxylic acid water reducing agent and 80 parts of water.
7. The large-span special-shaped fair-faced concrete structure as claimed in claim 1, wherein the auxiliary rod (71) is movably sleeved at both ends with connecting ends (76), one end of each connecting end (76) is fixed on the adjacent third support rod (6), the other end is fixed with a sharp blade (77), and the sharp blade (77) is inserted into the inner wall of the auxiliary rod (71).
8. The large-span specially-shaped bare concrete structure according to claim 7, wherein the tip of the pointed blade (77) extends to the outside of the auxiliary rod (71).
9. The large-span special-shaped fair-faced concrete structure of claim 3, wherein a positioning block (9) is arranged in the middle of the outer side of the arc end (81), and a positioning groove matched with the positioning block (9) is formed in the second supporting rod (3).
10. The construction method of the large-span special-shaped fair-faced concrete structure as claimed in claim 1, characterized by comprising the following steps:
s1, placing portland cement, zeolite powder, fly ash, graphene oxide, pebbles and desulfurized gypsum into a grinding mill for treatment for 25-40min, and baking at the temperature of 80-140 ℃ for 10-15 min; transferring to a stirrer after baking, adding water, mixing and stirring, adding other raw materials after stirring for 5min, and continuing stirring until the raw materials are completely mixed;
s2, assembling the upper reinforcement cage (4), the lower reinforcement cage (5) and the connecting pieces thereof with the template;
s3, pouring the concrete mixed in the S1 into the template assembled in the S2, carrying out layered blanking, controlling the thickness of each layer to be 500 +/-20 mm, and carrying out pouring molding to obtain a large-span special-shaped fair-faced concrete structure;
s4, maintaining the long-span special-shaped clear water concrete structure in the S3 until the structure reaches the designated strength, detaching the formwork, connecting the two ends of the concrete plate body (1) through the first supporting rod (2) and the second supporting rod (3), pouring joints among wallboards by using a sprayed concrete formwork-free process, and standing for 1-2d to finish construction.
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| CN114960929B (en) | 2024-03-26 |
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