CN116876748A - Steel-concrete combined high-strength high-ductility prestressed reinforcement concrete structure - Google Patents
Steel-concrete combined high-strength high-ductility prestressed reinforcement concrete structure Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 130
- 230000002787 reinforcement Effects 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 104
- 239000010959 steel Substances 0.000 claims abstract description 104
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 30
- 239000011513 prestressed concrete Substances 0.000 claims abstract description 27
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 238000004873 anchoring Methods 0.000 claims abstract description 8
- 238000009415 formwork Methods 0.000 claims abstract description 4
- 238000011065 in-situ storage Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 210000002435 tendon Anatomy 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- 210000003205 muscle Anatomy 0.000 claims 4
- 238000004891 communication Methods 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 238000003466 welding Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000004519 grease Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
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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
- B28B23/04—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 the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
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- 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
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a reinforced concrete combined high-strength high-ductility pre-stressed concrete structure, which comprises a concrete beam main body, wherein the concrete beam main body is a cast-in-situ concrete structure after a formwork is supported, a reinforcement cage is arranged in the concrete beam main body, the reinforcement cage comprises a stirrup group, C-shaped steel and NPR pre-stressed bars, the stirrup group comprises a plurality of stirrups which are arranged at intervals, the top of the stirrup group is welded with the C-shaped steel, the C-shaped steel wraps the top of the concrete beam main body, at least one NPR pre-stressed bar is penetrated in the stirrup group, the NPR pre-stressed bars are fixedly connected with the stirrup group, two ends of the NPR pre-stressed bars extend out of the concrete beam main body, and two end parts of the NPR pre-stressed bars are sleeved with anchoring devices. The invention adopts the cooperative stress of the C-shaped steel and the concrete, and overcomes the damage mode of crushing the concrete in the compression zone of the NPR reinforced concrete structure; the adoption of the NPR prestressed reinforcement improves the tensile property of the prestressed bundles in the reinforced concrete composite structure, improves the ductility of the structure, and further improves the high strength and high ductility of the concrete structure.
Description
Technical Field
The invention relates to the technical field of concrete structures, in particular to a steel-concrete combined high-strength high-ductility prestressed reinforcement concrete structure.
Background
In a reinforced concrete structure, steel bars are one of indispensable materials, the performance of the steel bars directly influences the performance of the structure, and under the background that energy conservation and environmental protection are advocated greatly in China, the requirement of engineering development cannot be met by using common steel bars as steel main materials in engineering construction. However, when the high-strength steel bar is applied to the concrete structure, the bearing capacity of the structure can be improved, but the yield platform of the high-strength steel bar is shorter, brittle failure is easy to occur, the structural system provided with the high-strength steel bar is easy to cause brittle failure, and the junction is seriously affectedThe safety of the structural system requires a new material to improve the ductility of the structure. The Poisson ratio value of the new NPR material reaches 10 -2 Magnitude (little to no necking), yield strength: 600-1110MPa, ultimate elongation: 30% -70%, the brittle failure problem caused by low ultimate elongation of the existing high-strength steel bar is solved, and the high-strength steel bar has high bearing capacity and high elongation. The material is applied to a building structure at present, so that the structure has high bearing capacity and high ductility, and the safety problem that a structural system provided with high-strength steel bars is easy to brittle fracture is solved. However, the test result shows that the concrete beam provided with the NPR steel bars is mainly crushed and damaged by the concrete in the compression zone, the NPR steel bars at the bottom are not broken, and the advantages of the NPR steel bars in high strength and high ductility are not obviously exerted, so that the compressive property of the concrete in the NPR steel bar concrete beam structure needs to be improved, the concrete and the NPR steel bars in high strength and high ductility can be better stressed cooperatively, and the tensile property of the NPR steel bars is better exerted.
Compared with reinforced concrete beams, the reinforced concrete combined concrete structure has the characteristics of reducing the section size, lightening the dead weight of the structure and increasing the ductility of the beams. Compared with steel beams, the steel consumption can be reduced, the rigidity is increased, and the stability and the integrity are improved. The steel-concrete combined concrete structure can better exert the tensile property of steel and the compressive property of concrete, but in order to better exert the compressive property of concrete and delay the generation of cracks of concrete, the concrete is usually prestressed in a mode of stretching an internal prestressing force bundle, but the stress property and the ductility of the structure are limited by the prestressing force bundle, so that the strength and the ductility of the prestressing force bundle are required to be improved to better exert the tensile property of the steel bars, and the strength and the ductility of the steel-concrete combined concrete structure are improved.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a steel-concrete combined high-strength high-ductility prestressed concrete structure and a manufacturing method thereof, which overcome the damage mode of crushing concrete in a pressed area of an NPR reinforced concrete structure on one hand and improve the tensile property of prestressed bundles in the steel-concrete combined structure on the other hand.
The technical scheme adopted for solving the technical problems is as follows:
the reinforced concrete combined high-strength high-ductility prestressed concrete structure comprises a concrete beam main body, wherein the concrete beam main body is a cast-in-situ concrete structure after a formwork is supported, a reinforcement cage is arranged in the concrete beam main body, the reinforcement cage comprises a stirrup group, C-shaped steel and NPR prestressed reinforcements, the stirrup group comprises a plurality of stirrups arranged at intervals, the top of the stirrup group is fixedly connected with the C-shaped steel, the top of the concrete beam main body is wrapped by the C-shaped steel, at least one NPR prestressed reinforcement is arranged in the stirrup group in a penetrating manner, the NPR prestressed reinforcement is fixedly connected with the stirrup group, two ends of the NPR prestressed reinforcement extend out of the concrete beam main body, and two end parts of the NPR prestressed reinforcement are sleeved with anchors.
Further, the C-shaped steel is finished steel, the cross section of the C-shaped steel is U-shaped, and the hollow cavity of the U-shaped C-shaped steel is used for being clamped on the concrete beam main body.
Further, anchor plates are fixed at two ends of the concrete beam main body in the axial direction, and holes are reserved at positions corresponding to the NPR prestressed tendons.
Further, the anchor is a clip-type anchor.
Further, the NPR pre-stressed surface is a spiral rib.
Further, a corrugated pipe is sleeved on the NPR pre-stressed bar in the concrete beam main body, and grouting materials are filled between the corrugated pipe and the NPR pre-stressed bar.
Further, the length of the corrugated pipe is equal to that of the concrete beam main body, and the inner diameter of the corrugated pipe is 10mm-20mm larger than the outer diameter of the NPR prestressed tendons; the distance from the inner diameter of the corrugated pipe to the edge of the concrete beam main body is more than or equal to 30mm, and the distance between the corrugated pipes is more than or equal to 1.5 times of the outer diameter of the corrugated pipe.
The manufacturing method of the steel-concrete combined high-strength high-ductility prestressed concrete structure comprises the following steps of:
s1, manufacturing a reinforcement cage: c-shaped steel is welded at the top of the stirrup group, and NPR steel bars are penetrated and fixedly connected in the stirrup group;
s2, turning over the reinforcement cage, taking C-shaped steel as a bottom film, supporting a mold to pour and vibrate concrete by taking the reinforcement cage as a foundation;
s3, curing the concrete to reach the design strength;
and S4, tensioning the NPR steel bar through a tensioner, and self-anchoring the NPR steel bar by using the clamping piece type anchorage device to form the NPR prestressed steel bar.
Further, in step S1, before the reinforcement cage is manufactured, a layer of paint is coated on the surface of the NPR reinforcement, and then an outer coating material is coated.
Further, in the step S1, a reinforcement cage is manufactured, the bottom of each stirrup is bound and connected with a corrugated pipe by an iron wire, and NPR reinforcement is arranged in the corrugated pipe.
The invention has the beneficial effects that:
(1) According to the invention, the C-shaped steel is used as the steel of the compression zone, a steel-concrete combined concrete structure is formed with the concrete beam main body, and the C-shaped steel and concrete are cooperatively deformed through welding with the stirrup, so that the mechanical properties of the steel and the concrete are fully exerted, and the bearing capacity of the structure is improved.
(2) The concrete in the C-shaped steel forms restrained concrete, and the bearing capacity of the concrete in the compression area is increased according to the characteristics of the restrained concrete that the compressive strength and the ductility are greatly improved, so that the top concrete is prevented from being crushed, and the bearing capacity of the steel-concrete combined concrete structure is improved.
(3) NPR steel bars are used as pre-stressed bars, so that cracks of the concrete structure are delayed; the NPR steel bar has the mechanical characteristics of high strength and high elongation, and the ductility of the steel-concrete combined concrete structure is effectively improved.
Drawings
FIG. 1 is a schematic structural view of a reinforced concrete composite high-strength high-ductility prestressed concrete structure of the present invention;
FIG. 2 is a schematic longitudinal section view of embodiment 1 of a reinforced concrete composite high-strength high-ductility prestressed concrete structure of the present invention;
FIG. 3 is a schematic cross-sectional view of embodiment 1 of a reinforced concrete composite high-strength high-ductility prestressed concrete structure of the present invention;
FIG. 4 is a schematic longitudinal section view of embodiment 2 of the reinforced concrete composite high-strength high-ductility prestressed concrete structure of the present invention;
FIG. 5 is a schematic cross-sectional view of embodiment 2 of the reinforced concrete composite high-strength high-ductility prestressed concrete structure of the present invention;
in the figure: 1. a concrete beam main body; 2. c-shaped steel; 3. an anchor plate; 4. an anchor; 5. a stirrup group; 6. a bellows; 7. NPR pre-stress tendons; 8. grouting; 9. and (5) hooping.
Detailed Description
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Common stirrups can be divided into single limb stirrups, open rectangular stirrups, closed rectangular stirrups, diamond stirrups, polygonal stirrups, groined stirrups, circular stirrups and the like, and the closed rectangular stirrups are selected as illustrations in the following embodiments.
Embodiment 1:
the utility model provides a steel-concrete combined high-strength high-ductility prestressed concrete structure as shown in fig. 1, fig. 2 and fig. 3, which comprises a concrete beam main body 1, wherein the concrete beam main body 1 is a cast-in-situ concrete structure after formwork erection, a reinforcement cage is arranged in the concrete beam main body 1, the reinforcement cage comprises a stirrup group 5, a C-shaped steel 2 and an NPR prestressed reinforcement 7, the stirrup group 5 comprises a plurality of stirrups which are arranged at equal intervals, the C-shaped steel 2 is welded at the top of the stirrup group 5, and the C-shaped steel 2 wraps the top of the concrete beam main body 1. The C-shaped steel 2 adopts finished steel, the procedure of welding and forming a plurality of steel plates is avoided, the cross section of the C-shaped steel 2 is U-shaped, the hollow cavity of the U-shaped C-shaped steel 2 is used for being clamped on the concrete beam main body 1, the length of the C-shaped steel 2 is equal to that of the reinforced concrete combined concrete beam main body 1, the welding length of the C-shaped steel 2 and a single stirrup is not less than 10d, and d is the diameter of the stirrup. C shaped steel 2 and stirrup group 5 welding have solved C shaped steel 2 surface smoothness, with the relatively poor characteristics of bonding effect of concrete, avoid C shaped steel 2 and concrete to produce sliding or C shaped steel 2 to take place to warp, guarantee C shaped steel 2 and concrete beam main part 1 collaborative deformation atress. During the bearing period of the structure, the C-shaped steel 2 and the concrete inside the C-shaped steel 2 bear pressure, at this time, the C-shaped steel 2 can form constraint on the concrete in the middle core part, the bearing capacity of the concrete in the middle core part is obviously improved, and the ductility of the concrete can be obviously improved, so that the concrete is prevented from being crushed in advance, and the bearing capacity of the steel-concrete combined prestressed reinforcement concrete structure is fully exerted.
Two NPR pre-stressed bars 7 are arranged in the stirrup group 5 in a penetrating way, a corrugated pipe 6 is sleeved outside the NPR pre-stressed bars 7, the corrugated pipe 6 is arranged at the right angle of the bottom in the stirrup, and the corrugated pipe 6 is connected with the stirrup through iron wire binding, so that the reinforcement cage is firmer. Cement paste is poured between the corrugated pipe 6 and the NPR prestressed reinforcement 7. The surface of the NPR prestressed rib 7 is provided with a spiral rib, so that good adhesion with cement paste can be realized, and normal operation of the NPR prestressed rib is ensured.
The NPR steel bar is a high-strength high-ductility steel bar, and the Poisson ratio value reaches 10 -2 Magnitude (little to no necking), yield strength: 600-1110MPa, ultimate elongation: 30% -70%, has the characteristic of constant resistance and large deformation, and realizes high-strength steel bars with high bearing capacity and high elongation; the NPR steel bar is used as a pre-stressed bar, and the high strength, high elongation and the mechanical properties of constant resistance and large deformation of the steel bar can be fully exerted.
The anchor plate 3 is a steel plate, holes are reserved at positions corresponding to the NPR pre-stressed ribs 7, the anchor plate 3 penetrates through the NPR pre-stressed ribs 7 to be adhered to the pore channel of the corrugated pipe 6 at two ends of the concrete beam through structural adhesive, and the mode is used for avoiding the phenomenon of stress concentration after tensioning pre-stress and avoiding crushing of end concrete caused by the phenomenon. The width of the anchor plate 3 is equal to the width of the beam section, the height is twice the distance from the NPR pre-stressed bar 7 to the beam bottom, the thickness is not less than 3mm, and in order to ensure that the NPR pre-stressed bar 7 can smoothly pass through, the diameter of the hole is about 2mm larger than the outer diameter of the steel bar.
The clamp type anchorage 4 selects corresponding specifications according to the diameter of the NPR pre-stressed bar 7, has excellent self-anchoring performance, is simple and convenient to construct and operate, has high anchoring compliance coefficient, and is stable and reliable in anchoring performance, and is installed at two ends of the NPR pre-stressed bar 7 to realize self-anchoring after tensioning is completed.
The following describes a method for producing the reinforced concrete composite high-strength high-ductility prestressed concrete structure, taking embodiment 1 as an example, comprising the steps of:
s1, manufacturing a reinforcement cage, welding C-shaped steel 2 at the top of a stirrup group 5, binding and connecting a corrugated pipe 6 with iron wires at right angles at the inner bottom of each stirrup, and arranging NPR reinforcement bars in the corrugated pipe 6. The bellows 6 mainly serves to reserve a duct for the NPR reinforcement, and the cross-sectional dimension of the stirrup is determined by the required clearance of the duct: the height is the difference between the beam height and the clearance between the corrugated pipe 6 and the edge of the concrete beam main body 1, and the width is the difference between the beam width and the clearance between the corrugated pipe 6 and the edge of the concrete beam main body 1, which is twice; in order to ensure the necessary shear resistance of the reinforced concrete structure and ensure that each crack is penetrated by at least one stirrup, the width of the inclined crack under the use load is controlled, and the distance between the stirrups meets the requirement of the maximum distance between the stirrups in the specification.
S2, turning over the reinforcement cage, taking the C-shaped steel 2 as a bottom film, taking the reinforcement cage as a foundation, supporting the mould, pouring and vibrating concrete, wherein grouting holes are arranged in pore channels at two ends of the corrugated pipe 6 and are used as exhaust holes.
S3, curing the concrete to reach the design strength. And comprehensively considering the type, the use environment, the design requirement, the casting time, the season and other factors of the concrete to determine the curing time and the conditions of the concrete.
And S4, after the concrete reaches the design strength, tensioning the NPR steel bars, wherein the anchor plates 3 penetrate through the NPR steel bars, are stuck to the pore channels of the corrugated pipes 6 at the two ends of the concrete beam, the clamping piece type anchorage devices 4 are sleeved at the extending ends of the NPR steel bars, and the NPR steel bars are tensioned through the penetrating jacks, and the clamping piece type anchorage devices 4 self-anchor the NPR steel bars to form NPR pre-stressed bars 7.
S5, grouting material 8 is poured into the gap between the NPR pre-stressed rib 7 and the corrugated pipe 6, and the grouting material 8 can be cement paste, so that the grouting material and concrete form a whole, the mechanical properties of high strength and high elongation are fully exerted, and the bearing capacity and ductility of the structure are improved. The ultimate bending moment of the steel-concrete combined high-strength high-ductility prestressed concrete structure can be calculated according to the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,is an equivalent rectangular stress coefficient; />The design value of the compressive strength of the concrete axle center is designed; />The section width of the concrete beam; />The height of the concrete compression area is set; />Is the effective height of the section; />Tensile strength of the pre-stressed bars 7 for NPR; />The compressive strength of the C-shaped steel 2 is designed; />The cross-sectional area of the pre-strain bars 7 for NPR; />Is the cross-sectional area of the C-shaped steel 2; />Is the distance from the centroid of the section of the C-shaped steel 2 to the NPR pre-stress bar 7.
S6, curing the poured cement paste to reach the design strength.
In the embodiment, the tensile force applied by the prestressed reinforcement is transmitted through the bonding between the concrete and the reinforced bar, so that the bearing capacity of the concrete structure can be improved, the cracking resistance of the concrete is improved, the service life of the concrete structure is further prolonged, and the maintenance cost of the concrete structure is reduced, so that the prestressed reinforcement is widely applied to projects with high requirements on high strength, high durability and safety.
Embodiment 2:
in the steel-concrete combined high-strength high-ductility prestressed concrete structure provided in the embodiment of fig. 4 and 5, another treatment mode of NPR prestressed bars 7 in concrete is adopted. The NPR pre-stressed bars 7 are directly bound with the stirrup groups 5 at right angles on the inner sides of the bottoms of the NPR pre-stressed bars through iron wires, rust-proof grease is coated on the surfaces of the NPR pre-stressed bars 7, plastic sleeves are sleeved on the outer sides of the NPR pre-stressed bars 7 coated with the rust-proof grease, and therefore the NPR pre-stressed bars are mainly isolated from surrounding concrete, friction loss during tensioning is reduced, and corrosion of the pre-stressed bars is prevented.
The following describes a method for producing the reinforced concrete composite high-strength high-ductility prestressed concrete structure, taking embodiment 2 as an example, comprising the steps of:
s1, firstly brushing an antirust grease layer on the surface of the NPR steel bar, and then sleeving a plastic sleeve.
S2, manufacturing a reinforcement cage, welding C-shaped steel 2 at the top of the stirrup group 5, binding and connecting NPR reinforcement bars by iron wires at right angles at the bottom in the stirrup group 5, and installing a tensioning anchor 4 and a clamping piece type anchor 4.
S3, turning over the reinforcement cage, taking the C-shaped steel 2 as a bottom film, and supporting the mold to pour concrete on the basis of the reinforcement cage.
S4, curing the concrete to reach the design strength, and comprehensively considering factors such as the type, the use environment, the design requirement, the casting time and the season of the concrete to determine the curing time and the conditions of the concrete.
And S5, tensioning the NPR steel bar by means of the tensioning anchor 4 and the penetrating jack, and self-anchoring the NPR steel bar by the clamping anchor 4 to form the NPR prestressed reinforcement 7. The anchor 4 has the characteristics of being more closed and higher in strength than the clip-type anchor 4 in the embodiment 1, mainly because the prestress force transmission mode in the prestressed concrete structure is mainly based on the fixation of reinforcing steel bars at two ends, and is different from the mode in which prestress force is transmitted by bonding force in the prestressed concrete structure in the embodiment 1.
The reinforced concrete combined high-strength high-ductility prestressed concrete structure in the embodiment does not need to reserve various pore canals, penetrate ribs, grouting and other complex works, has simple construction procedures in the construction process, accelerates the construction speed, has small friction force, has flexible body type and can become a curve type, and is particularly suitable for the construction of various large-span single-direction continuous multi-span line reinforcement beam slab structures.
Compared with the traditional NPR reinforced concrete structure, the novel reinforced concrete structure adopts the C-shaped steel 2 as the steel of the compression zone, forms a reinforced concrete combined concrete structure with the concrete beam main body 1, fully exerts the mechanical properties of the steel and concrete, adopts the NPR reinforced steel with high strength and high elongation as the pre-stressed steel bar compared with the traditional reinforced concrete combined concrete structure, delays the occurrence of cracks of the structure, and effectively improves the ductility of the reinforced concrete combined concrete structure.
Claims (10)
1. The utility model provides a reinforced concrete combination high strength high ductility pre-stressed concrete structure, includes concrete beam main part (1), cast-in-situ concrete structure behind concrete beam main part (1) for the formwork, a serial communication port, be provided with the steel reinforcement cage in concrete beam main part (1), the steel reinforcement cage includes stirrup group (5), C shaped steel (2), NPR pre-stressed muscle (7), stirrup group (5) are including a plurality of interval arrangement's stirrup (9), stirrup group (5) top fixedly connected with C shaped steel (2), C shaped steel (2) are wrapped up the top of concrete beam main part (1), wear to be equipped with at least one NPR pre-stressed muscle (7) in stirrup group (5), NPR pre-stressed muscle (7) both ends extend out concrete beam main part (1), NPR pre-stressed muscle (7) both ends portion cover is equipped with ground tackle (4).
2. The reinforced concrete combined high-strength high-ductility prestressed concrete structure of claim 1, wherein the C-shaped steel (2) is a finished steel, the cross section of the C-shaped steel (2) is U-shaped, and the hollow cavity of the U-shaped C-shaped steel (2) is used for being clamped on the concrete beam main body (1).
3. The reinforced concrete combined high-strength high-ductility prestressed concrete structure according to claim 1, wherein anchor plates (3) are fixed at two ends of the concrete beam main body (1) in the axial direction, and holes are reserved at positions of the anchor plates (3) corresponding to the NPR prestressed bars (7).
4. The steel-concrete combined high-strength high-ductility prestressed concrete structure of claim 1, wherein said anchorage device (4) is a clip-type anchorage device (4).
5. The steel-concrete combined high-strength high-ductility prestressed concrete structure according to claim 1, wherein the surface of the NPR prestressed bars (7) is a spiral rib.
6. The reinforced concrete combined high-strength high-ductility prestressed concrete structure of claim 1, wherein the NPR prestressed bars (7) in the concrete beam main body (1) are sleeved with corrugated pipes (6), and grouting materials (8) are filled between the corrugated pipes (6) and the NPR prestressed bars (7).
7. The reinforced concrete combined high-strength high-ductility prestressed concrete structure according to claim 1, wherein the length of the corrugated pipe (6) is equal to that of the concrete beam main body (1), and the inner diameter of the corrugated pipe (6) is 10mm-20mm larger than the outer diameter of the NPR prestressed tendons; the distance between the corrugated pipes (6) and the edge of the concrete beam main body (1) is more than or equal to 30mm, and the distance between the corrugated pipes (6) is more than or equal to 1.5 times the outer diameter of the corrugated pipes (6).
8. The manufacturing method of the steel-concrete combined high-strength high-ductility prestressed concrete structure is characterized by comprising the following steps of:
s1, manufacturing a reinforcement cage: c-shaped steel (2) is welded at the top of the stirrup group (5), and NPR steel bars are penetrated and fixedly connected in the stirrup group (5);
s2, turning over the reinforcement cage, taking the C-shaped steel (2) as a bottom film, supporting the mould to pour and vibrate the concrete by taking the reinforcement cage as a foundation;
s3, curing the concrete to reach the design strength;
and S4, tensioning the NPR steel bars through a tensioner, and self-anchoring the NPR steel bars by the clamping piece type anchorage device (4) to form NPR prestressed bars (7).
9. The method for manufacturing a reinforced concrete composite high-strength high-ductility prestressed concrete structure according to claim 8, wherein in step S1, before the reinforcement cage is manufactured, a layer of paint is coated on the surface of the NPR reinforcement, and then an outer coating material is coated.
10. The method for manufacturing the reinforced concrete combined high-strength high-ductility prestressed concrete structure according to claim 8, wherein in the step S1, a reinforcement cage is manufactured, the inner bottom of each stirrup (9) is bound and connected with a corrugated pipe (6) by an iron wire, and NPR reinforcement is arranged in the corrugated pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311079830.3A CN116876748A (en) | 2023-08-25 | 2023-08-25 | Steel-concrete combined high-strength high-ductility prestressed reinforcement concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311079830.3A CN116876748A (en) | 2023-08-25 | 2023-08-25 | Steel-concrete combined high-strength high-ductility prestressed reinforcement concrete structure |
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