CN114809448B - Template-free assembled UHPC-recycled concrete superposed column and construction method - Google Patents
Template-free assembled UHPC-recycled concrete superposed column and construction method Download PDFInfo
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- CN114809448B CN114809448B CN202210410544.XA CN202210410544A CN114809448B CN 114809448 B CN114809448 B CN 114809448B CN 202210410544 A CN202210410544 A CN 202210410544A CN 114809448 B CN114809448 B CN 114809448B
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- 239000004567 concrete Substances 0.000 title claims abstract description 87
- 238000010276 construction Methods 0.000 title claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 320
- 239000010959 steel Substances 0.000 claims abstract description 320
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 37
- 238000013461 design Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 19
- 230000002787 reinforcement Effects 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 4
- 230000002745 absorbent Effects 0.000 claims description 3
- 239000002250 absorbent Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000013589 supplement Substances 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
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
-
- 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
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
-
- 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
- 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
-
- 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
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/122—Machines for joining reinforcing bars
- E04G21/123—Wire twisting tools
-
- 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
- E04G21/14—Conveying or assembling building elements
Abstract
The invention provides a template-free assembled UHPC-recycled concrete superposed column and a construction method, and belongs to the technical field of assembled concrete structures. The method solves the problems of how to apply the recycled aggregate to the fabricated concrete structure to strengthen node connection of the fabricated concrete structure and create a closed environment for the recycled aggregate. The node of the fabricated concrete structure is reinforced by reasonably applying the steel structure, so that the connecting node meets the design requirement of a strong node, a closed environment is created for recycled concrete by prefabricating an ultra-high performance concrete (UHPC) shell and a cast-in-situ recycled concrete column core, reliable connection of steel bars and the steel node and reliable connection of the steel node and the steel node are realized by reasonably setting a structure, the bonding performance of the concrete and the steel node in a core area is improved by setting a circumferential rib, and the whole member does not need a template and is simple to connect, so that the construction efficiency can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of assembled concrete structures, and particularly relates to a template-free assembled UHPC-recycled concrete superposed column and a construction method.
Background
The assembled concrete structure is one of important directions of development of building structures in China, has the advantages of improving and guaranteeing engineering quality, improving production efficiency, reducing construction cost, saving energy, protecting environment and the like, and has wide development space. The common connection modes of the assembled concrete structure mainly comprise sleeve grouting connection, spiral stirrup slurry anchor lap joint connection and corrugated pipe slurry anchor lap joint connection, but the connection is difficult to meet the design requirement of 'strong joint strong anchoring', and even becomes a structural weak point.
On the other hand, the existing building is transformed and dismantled to generate a large amount of building solid waste, and according to statistics, the waste concrete yield in China exceeds 30 hundred million tons in 2020, and new challenges are presented to the sustainable development of the building industry, and recycled aggregate prepared from the building solid waste and the industrial solid waste is generated. The research shows that the recycled aggregate has high porosity and water absorption, absorbs water in the process of mixing concrete, releases water in the process of hydrating cement, and supplements water in capillary pores in time, which is called internal curing effect. The internal curing effect of the recycled aggregate improves self-drying, self-shrinkage and basic creep of the concrete, and the recycled aggregate is more scientific and reasonable in application in a closed environment.
In summary, the application of recycled aggregate to the fabricated concrete structure can consume a great deal of building solid waste and industrial solid waste, but how to strengthen node connection of the fabricated concrete structure and create a closed environment for the recycled aggregate becomes a working difficulty to be solved.
Disclosure of Invention
In view of the above, the present invention aims to provide a template-free assembled UHPC-recycled concrete composite column and a construction method thereof, so as to solve the two problems mentioned in the background art. The node of the fabricated concrete structure is reinforced by reasonably applying the steel structure, so that the connecting node meets the design requirement of a strong node, a closed environment is created for recycled concrete by prefabricating an ultra-high performance concrete (UHPC) shell and a cast-in-situ recycled concrete column core, reliable connection of steel bars and the steel node and reliable connection of the steel node and the steel node are realized by reasonably setting a structure, the bonding performance of the concrete and the steel node in a core area is improved by setting a circumferential rib, and the whole member does not need a template and is simple to connect, so that the construction efficiency can be effectively improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the construction method of the template-free assembled UHPC-recycled concrete superposed column specifically comprises the following construction steps:
(1) Manufacturing a steel node: manufacturing a plurality of short inner steel pipes, a plurality of long outer steel pipes, a plurality of long inner steel pipes, a plurality of short outer steel pipes and a plurality of circumferential ribs according to the size design, welding the short inner steel pipes, the long outer steel pipes and the circumferential ribs into the upper part of a steel node, and welding the long inner steel pipes, the short outer steel pipes and the circumferential ribs into the lower part of the steel node;
(2) Prefabricated UHPC shell: binding or spot-welding a plurality of longitudinal steel bars and a plurality of stirrups into a steel bar cage according to the design, respectively welding the upper part and the lower part of a steel node at two ends of the steel bar cage, wherein the end parts of the longitudinal steel bars are welded with the circumferential ribs, the outer surfaces of the longitudinal steel bars are welded with the inner surfaces of the inner steel pipes, the upper surfaces of the stirrups are welded with the sections of the inner steel pipes, casting a UHPC shell at the position of the steel bar cage according to the design thickness, and curing to the design strength;
(3) Connecting steel nodes: transporting the prefabricated overlapped columns to a construction site, inserting the upper parts of steel nodes of the overlapped columns into the lower parts of the steel nodes, enabling the short inner steel pipes to be in contact with the long inner steel pipes through adjusting angles, enabling the concave-convex shapes of the long outer steel pipes and the short outer steel pipes to be meshed with each other, and welding and connecting the concave-convex meshed parts;
(4) Pouring a recycled concrete core: and (3) tightly pouring the regenerated concrete core in the UHPC shell, and continuing the next working procedure after waiting for the regenerated concrete core to reach the design strength.
The template-free assembled UHPC-recycled concrete superposed column comprises a short inner steel pipe, a long outer steel pipe, a long inner steel pipe, a short outer steel pipe, a plurality of circumferential ribs, a plurality of longitudinal steel bars, a plurality of stirrups, a UHPC shell and a recycled concrete core;
the outer surface of the short inner steel pipe is tightly attached to the inner surface of the long outer steel pipe, the circumferential rib is positioned on the inner surface of the short inner steel pipe, and the short inner steel pipe, the long outer steel pipe and the circumferential rib are welded to form the upper part of the steel node; the outer surface of the long inner steel pipe is tightly attached to the inner surface of the short outer steel pipe, the circumferential rib is positioned on the inner surface of the long inner steel pipe, and the long inner steel pipe, the short outer steel pipe and the circumferential rib are welded to form the lower part of the steel node; a plurality of longitudinal steel bars and a plurality of stirrups are bound or spot welded into a steel reinforcement cage, the upper part of the steel node and the lower part of the steel node are respectively welded at two ends of the steel reinforcement cage, the UHPC shell is positioned at the position of the steel reinforcement cage, and the recycled concrete core is positioned inside the UHPC shell, the short inner steel tube and the long inner steel tube.
Furthermore, the joint of the long outer steel pipe and the short outer steel pipe is in a concave-convex shape which is meshed with each other.
Further, the steel strength grades of the short inner steel pipe, the long outer steel pipe, the long inner steel pipe, the short outer steel pipe and the circumferential rib are not lower than Q355.
Further, the thicknesses of the short inner steel pipe, the long outer steel pipe, the long inner steel pipe and the short outer steel pipe are not less than 2/3 of the diameters of the longitudinal steel bars.
Further, the thickness of the circumferential rib is not smaller than the diameter of the longitudinal steel bar, and the width of the circumferential rib is not smaller than 1.5 times of the diameter of the longitudinal steel bar.
Furthermore, the position distance between the circumferential rib and the edge of the short inner steel pipe is not less than the anchoring length of the longitudinal steel bar, the end parts of the longitudinal steel bar are welded with the circumferential rib, and the outer surface of the longitudinal steel bar is welded with the inner surface of the inner steel pipe.
Furthermore, the upper surface of the stirrup is welded with the edge of the short inner steel pipe.
Further, the thickness of the UHPC shell is not less than the distance from the inner side surface of the longitudinal steel bar to the outer surface of the superposed column.
Further, the recycled concrete core is recycled concrete doped with recycled aggregate made of waste concrete or industrial tailings, or internally cured concrete doped with super absorbent resin material or lightweight aggregate.
Compared with the prior art, the invention adopts the steel structure node to improve the connection mode of the traditional assembled concrete column, improves the traditional reinforced concrete column into the superposed column of the prefabricated UHPC shell and the cast-in-situ recycled concrete column core, and improves the bonding performance of the concrete in the core area and the steel node by reasonably constructing the integrity of the reinforcing steel bars and the steel node and arranging the annular rib. In combination, the fabricated folding column has the following advantages:
(1) High-performance materials are reasonably utilized. The structural joint is not only the cross joint of the upper frame column, the lower frame column, the frame beam and the floor slab, but also the key point of building structural shock resistance fortification, and the structural joint is provided with a steel structure to enhance the rigidity and bearing capacity of the joint; under the action of bending moment, the stress on the outer side of the section of the outer frame column is maximum, and the outer shell of the superposed column is UHPC with ultrahigh strength so as to bear tensile force or pressure, thereby fully playing the performance of high-strength materials.
(2) The steel structure has good stress performance. The steel structure node consists of a short inner steel pipe, a long outer steel pipe, a long inner steel pipe, a short outer steel pipe and circumferential ribs, wherein the inner steel pipe is nested in the outer steel pipe to form good shearing resistance, and the joint of the outer steel pipe is arranged as a concave-convex type bite, so that on one hand, the torsion resistance is enhanced, and on the other hand, the length of a welding line is lengthened to increase the tensile resistance or the bending resistance.
(3) The long-term deformation and durability of the member are effectively improved. The UHPC shell on the outer side of the superposed column is prefabricated in a factory, the shrinkage deformation of the concrete in the early stage is basically completed, and a compact crack-free UHPC shell is formed, so that the service life and durability of the structure are improved, a closed environment is provided for the recycled concrete, and the self-generated shrinkage, basic creep and other long-term deformation of the component are effectively improved due to the internal maintenance effect of recycled aggregate.
(4) Reliable connection and good integrity of the components. The ends of the longitudinal steel bars are welded with the circumferential ribs, the side surfaces of the longitudinal steel bars are welded with the inner surface of the inner steel pipe, and the surfaces of the stirrups are welded with the cross section of the inner steel pipe, so that the reliable connection between the steel nodes and the steel reinforcement cage is realized; the steel pipe outside the steel node is welded to realize the reliable connection between the steel node and the steel node; the bonding performance of the concrete and the steel nodes in the core area is improved by arranging the annular ribs, so that the effective transmission of shearing force at the nodes is realized.
(5) The connection is convenient, and the construction efficiency is high. Prefabricating the steel nodes of the superposed column and the UHPC shell in a factory, transporting to a construction site, nesting and welding the steel nodes to finish node connection, and finally pouring a recycled concrete core to finish construction. Compared with the traditional connection mode, the method is more efficient and quick, and the construction efficiency is greatly improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic perspective view of the internal structure of a modular UHPC-recycled concrete composite column without a formwork according to the present invention;
FIG. 2 is a schematic perspective view of the fabricated UHPC-recycled concrete composite column;
the reference numerals of the drawings illustrate: 1-short inner steel tube; 2-long outer steel pipes; 3-long inner steel pipes; 4-short outer steel pipes; 5-circumferential ribs; 6, longitudinal steel bars; 7-stirrups; 8-UHPC shell; 9-recycled concrete core.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that, in the case of no conflict, embodiments of the present invention and features of the embodiments may be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.
1. 1-2, a template-free assembled UHPC-recycled concrete superposed column comprises a short inner steel pipe 1, a long outer steel pipe 2, a long inner steel pipe 3, a short outer steel pipe 4, a plurality of circumferential ribs 5, a plurality of longitudinal steel bars 6, a plurality of stirrups 7, a UHPC shell 8 and a recycled concrete core 9;
the outer surface of the short inner steel pipe 1 is tightly attached to the inner surface of the long outer steel pipe 2, the circumferential rib 5 is positioned on the inner surface of the short inner steel pipe 1, and the three are welded to form the upper part of a steel node; the outer surface of the long inner steel pipe 3 is tightly attached to the inner surface of the short outer steel pipe 4, the circumferential rib 5 is positioned on the inner surface of the long inner steel pipe 3, and the long inner steel pipe 3, the short outer steel pipe 4 and the circumferential rib are welded to form the lower part of a steel joint; a plurality of longitudinal steel bars 6 and a plurality of stirrups 7 are banded or spot welded into the steel reinforcement cage, and steel node upper portion and steel node lower part are welded respectively at steel reinforcement cage both ends, and UHPC shell 8 is located the steel reinforcement cage position, and recycled concrete core 9 is located inside UHPC shell 8, short interior steel pipe 1 and long interior steel pipe 3.
The invention designs the upper part and the lower part of the steel node, the structural node is not only the cross joint of the upper frame column, the lower frame column, the frame beam and the floor slab, but also the key point of the building structure for anti-seismic fortification, and the structural node is provided with a steel structure to enhance the rigidity and the bearing capacity of the node; under the action of bending moment, the stress on the outer side of the section of the outer frame column is maximum, and the outer shell of the superposed column is UHPC with ultrahigh strength so as to bear tensile force or pressure, thereby fully playing the performance of high-strength materials.
The steel structure node is composed of a short inner steel pipe 1, a long outer steel pipe 2, a long inner steel pipe 3, a short outer steel pipe 4 and circumferential ribs 5, wherein the short inner steel pipe 1 and the long inner steel pipe 3 form an inner steel pipe, the long outer steel pipe 2 and the short outer steel pipe 4 form an outer steel pipe, the inner steel pipe is nested in the outer steel pipe to form good shearing resistance, the joint of the outer steel pipe is arranged to be a concave-convex type bite, on one hand, the torsion resistance is enhanced, and on the other hand, the length of a welding line is lengthened to increase the tensile resistance or the bending resistance.
The steel strength grades of the short inner steel pipe 1, the long outer steel pipe 2, the long inner steel pipe 3, the short outer steel pipe 4 and the circumferential rib 5 are not lower than Q355. Strength matching needs to be achieved in consideration of the strength of the longitudinal bars 6, and thus the strength is generally not lower than Q355.
The thickness of the short inner steel pipe 1, the long outer steel pipe 2, the long inner steel pipe 3 and the short outer steel pipe 4 is not less than 2/3 of the diameter of the longitudinal steel bar 6. As the main force transmission component at the joint, the thicknesses of the short inner steel pipe 1, the long outer steel pipe 2, the long inner steel pipe 3 and the short outer steel pipe 4 are directly related to the safety of the joint, firstly, the reliable connection of the longitudinal steel bars 6 of the upper column and the lower column of the joint needs to be ensured, and the thicknesses of the short inner steel pipe 1, the long outer steel pipe 2, the long inner steel pipe 3 and the short outer steel pipe 4 are reinforced to 2/3 of the diameter of the longitudinal steel bars 6 in consideration of the adverse working condition that the longitudinal steel bars 6 may have local tension and compression of an anchoring area, so that the stress capacity, the earthquake resistance and the supporting function during construction of the joint are fully ensured.
The thickness of the circumferential rib 5 is not smaller than the diameter of the longitudinal steel bar 6, and the width of the circumferential rib 5 is not smaller than 1.5 times of the diameter of the longitudinal steel bar 6. The thicker annular rib 5 has higher rigidity and higher shearing resistance, the design of the thickness of the annular rib 5 can bear the concentrated force transmitted by the longitudinal steel bars 6 and reliably transmit the concentrated force to the steel nodes, and the design of the width of the annular rib 5 can facilitate the welding connection construction of the connection part of the annular rib 5 and the longitudinal steel bars 6 and can also strengthen the bonding performance of the annular rib and the recycled concrete core.
The position distance of the circumferential rib 5 is not less than the anchoring length of the longitudinal steel bar 6 at the edge of the short inner steel tube 1, the end part of the longitudinal steel bar 6 is welded with the circumferential rib 5, and the outer surface of the longitudinal steel bar 6 is welded with the inner surface of the inner steel tube. The reliable anchoring of the longitudinal bars 6 is fully ensured.
The upper surface of the stirrup 7 is welded with the edge of the short inner steel pipe 1. The end parts of the longitudinal steel bars 6 are welded with the circumferential ribs 5, the side surfaces of the longitudinal steel bars 6 are welded with the inner surface of the inner steel pipe, and the surfaces of the stirrups 7 are welded with the cross section of the inner steel pipe, so that reliable connection between the steel nodes and the steel reinforcement cage is realized; the steel pipe outside the steel node is welded to realize the reliable connection between the steel node and the steel node; by arranging the annular rib 5, the bonding performance of the concrete and the steel node in the core area is improved, and the effective transmission of shearing force at the node is realized.
The thickness of the UHPC shell 8 is not less than the distance from the inner side surface of the longitudinal steel bar 6 to the outer surface of the superposed column. On one hand, the outer surface of the UHPC shell 8 is flush with the outer steel pipe surface of the node, thereby achieving the neat and beautiful connection of the component and the node, and not affecting the subsequent decoration engineering construction; on the other hand, the inner surface of the UHPC shell 8 at least reaches the inner side surface of the longitudinal steel bar 6, so that the reliable connection between the UHPC shell 8 and the steel bar cage is realized, and good stress capability and integrity can be realized after pouring is finished.
The recycled concrete core 9 is recycled concrete doped with recycled aggregate made of waste concrete or industrial tailings, or internally cured concrete doped with super absorbent resin material or lightweight aggregate. In the external closed environment, the internal curing effect of the recycled concrete or the internal curing concrete can be fully utilized, and the purposes of improving the hydration degree of cement and reducing shrinkage creep deformation are achieved.
According to the invention, the node of the steel structure reinforced assembly type concrete structure is reasonably designed, so that the connecting node meets the design requirement of a strong node, the traditional reinforced concrete column is improved into a superposed column with a prefabricated UHPC shell and a cast-in-situ recycled concrete column core, the integrity of reinforcing steel bars and the steel node and the integrity of the steel node and the steel node are reasonably constructed, the bonding performance of the concrete in a core area and the steel node is improved by arranging the annular rib, the whole member does not need a template, the connection is simple, and the construction efficiency can be effectively improved. The assembled laminated column fully plays the role of high-strength materials, can effectively improve the long-term deformation and durability of the components, and enhances the integrity.
The construction method of the template-free assembled UHPC-recycled concrete superposed column specifically comprises the following construction steps:
(1) Manufacturing a steel node: manufacturing a plurality of short inner steel pipes 1, a plurality of long outer steel pipes 2, a plurality of long inner steel pipes 3, a plurality of short outer steel pipes 4 and a plurality of circumferential ribs 5 according to the size design, welding one piece of each of the short inner steel pipes 1, the long outer steel pipes 2 and the circumferential ribs 5 to form the upper part of a steel node, and welding one piece of each of the long inner steel pipes 3, the short outer steel pipes 4 and the circumferential ribs 5 to form the lower part of the steel node;
(2) Prefabricated UHPC shell: binding or spot welding a plurality of longitudinal steel bars 6 and a plurality of stirrups 7 into a steel reinforcement cage according to the design, respectively welding the upper part of a steel node and the lower part of the steel node at two ends of the steel reinforcement cage, wherein the end parts of the longitudinal steel bars 6 are welded with the circumferential ribs 5, the outer surfaces of the longitudinal steel bars 6 are welded with the inner surfaces of the inner steel pipes, the upper surfaces of the stirrups 7 are welded with the sections of the inner steel pipes, casting a UHPC shell 8 at the positions of the steel reinforcement cage according to the design thickness, and curing to the design strength;
(3) Connecting steel nodes: transporting the prefabricated overlapped columns to a construction site, inserting the upper parts of steel nodes of the overlapped columns into the lower parts of the steel nodes, enabling the short inner steel pipes 1 to be in contact with the long inner steel pipes 3 through adjusting angles, enabling the concave-convex shapes of the long outer steel pipes 2 and the short outer steel pipes 4 to be meshed with each other, and welding and connecting the concave-convex meshed parts;
(4) Pouring a recycled concrete core: and (3) tightly pouring the recycled concrete core 9 in the UHPC shell, and continuing the next procedure after waiting for the recycled concrete core 9 to reach the design strength.
The UHPC shell on the outer side of the superposed column is prefabricated in a factory, the shrinkage deformation of the concrete in the early stage is basically completed, and a compact crack-free UHPC shell is formed, so that the service life and durability of the structure are improved, a closed environment is provided for the recycled concrete, and the self-generated shrinkage, basic creep and other long-term deformation of the component are effectively improved due to the internal maintenance effect of recycled aggregate.
The invention adopts the steel structure node to improve the traditional connection mode of the assembled concrete column, and the steel structure node consists of a short inner steel pipe 1, a long outer steel pipe 2, a long inner steel pipe 3, a short outer steel pipe 4 and a circumferential rib 5, thereby having good stress performance. The traditional reinforced concrete column is improved into a superposed column with a prefabricated UHPC shell and a cast-in-situ recycled concrete column core, and long-term deformation and durability of the component are effectively improved. Through reasonable construction reinforcing bar and steel node, steel node and steel node's degree of connection, through setting up the bonding performance of annular rib improvement core district concrete and steel node, improve the wholeness of component. Compared with the traditional connection mode, the steel structure node is more efficient and quick, and the construction efficiency is greatly improved.
The embodiments of the invention disclosed above are intended only to help illustrate the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention.
Claims (9)
1. The construction method of the template-free assembled UHPC-recycled concrete superposed column is characterized by comprising the following construction steps of:
(1) Manufacturing a steel node: manufacturing a plurality of short inner steel pipes (1), a plurality of long outer steel pipes (2), a plurality of long inner steel pipes (3), a plurality of short outer steel pipes (4) and a plurality of circumferential ribs (5) according to the size design, welding the short inner steel pipes (1), the long outer steel pipes (2) and the circumferential ribs (5) to form upper parts of steel nodes, and welding the long inner steel pipes (3), the short outer steel pipes (4) and the circumferential ribs (5) to form lower parts of the steel nodes;
(2) Prefabricated UHPC shell: binding or spot welding a plurality of longitudinal steel bars (6) and a plurality of stirrups (7) into a steel bar cage according to the design, respectively welding the upper part and the lower part of a steel node at two ends of the steel bar cage, wherein the end parts of the longitudinal steel bars (6) are welded with the circumferential ribs (5), the outer surfaces of the longitudinal steel bars (6) are welded with the inner surfaces of the inner steel pipes, the upper surfaces of the stirrups (7) are welded with the sections of the inner steel pipes, casting a UHPC shell (8) at the positions of the steel bar cage according to the design thickness, and curing to the design strength;
(3) Connecting steel nodes: transporting the prefabricated overlapped columns to a construction site, inserting the upper parts of steel nodes of the overlapped columns into the lower parts of the steel nodes, enabling the short inner steel pipes (1) to be in contact with the long inner steel pipes (3) through adjusting angles, enabling the long outer steel pipes (2) to be meshed with the concave-convex shapes of the short outer steel pipes (4), and welding and connecting the concave-convex shapes at the meshed positions;
(4) Pouring a recycled concrete core: densely pouring a recycled concrete core (9) in the UHPC shell, and continuing the next procedure after the recycled concrete core (9) reaches the design strength;
the template-free assembled UHPC-recycled concrete superposed column comprises a short inner steel pipe (1), a long outer steel pipe (2), a long inner steel pipe (3), a short outer steel pipe (4), a plurality of circumferential ribs (5), a plurality of longitudinal steel bars (6), a plurality of stirrups (7), a UHPC shell (8) and a recycled concrete core (9);
the outer surface of the short inner steel pipe (1) is tightly attached to the inner surface of the long outer steel pipe (2), the circumferential rib (5) is positioned on the inner surface of the short inner steel pipe (1), and the short inner steel pipe, the long outer steel pipe and the long outer steel pipe are welded to form the upper part of a steel node; the outer surface of the long inner steel pipe (3) is tightly attached to the inner surface of the short outer steel pipe (4), the circumferential rib (5) is positioned on the inner surface of the long inner steel pipe (3), and the long inner steel pipe, the short outer steel pipe and the circumferential rib are welded to form the lower part of a steel node; a plurality of longitudinal steel bars (6) and a plurality of stirrups (7) are bound or spot welded into a steel reinforcement cage, the upper part of a steel node and the lower part of the steel node are respectively welded at two ends of the steel reinforcement cage, the UHPC shell (8) is positioned at the position of the steel reinforcement cage, and the recycled concrete core (9) is positioned inside the UHPC shell (8), the short inner steel tube (1) and the long inner steel tube (3).
2. The construction method of the template-free assembled UHPC-recycled concrete composite column according to claim 1, which is characterized by comprising the following steps: the joint of the long outer steel pipe (2) and the short outer steel pipe (4) is in a concave-convex shape which is meshed with each other.
3. The construction method of the template-free assembled UHPC-recycled concrete composite column according to claim 1 or 2, which is characterized by comprising the following steps: the steel strength grades of the short inner steel pipe (1), the long outer steel pipe (2), the long inner steel pipe (3), the short outer steel pipe (4) and the annular rib (5) are not lower than Q355.
4. The construction method of the template-free assembled UHPC-recycled concrete composite column according to claim 1 or 2, which is characterized by comprising the following steps: the thicknesses of the short inner steel pipe (1), the long outer steel pipe (2), the long inner steel pipe (3) and the short outer steel pipe (4) are not smaller than 2/3 of the diameter of the longitudinal steel bar (6).
5. The construction method of the template-free assembled UHPC-recycled concrete composite column according to claim 1, which is characterized by comprising the following steps: the thickness of the circumferential rib (5) is not smaller than the diameter of the longitudinal steel bar (6), and the width of the circumferential rib (5) is not smaller than 1.5 times of the diameter of the longitudinal steel bar (6).
6. The construction method of the template-free assembled UHPC-recycled concrete composite column according to claim 1, 2 or 5, wherein the construction method comprises the following steps: the position distance of the circumferential rib (5) is not less than the anchoring length of the longitudinal steel bars (6) at the edge of the short inner steel tube (1), the end parts of the longitudinal steel bars (6) are welded with the circumferential rib (5), and the outer surfaces of the longitudinal steel bars (6) are welded with the inner surface of the inner steel tube.
7. The construction method of the template-free assembled UHPC-recycled concrete composite column according to claim 1, 2 or 5, wherein the construction method comprises the following steps: the upper surface of the stirrup (7) is welded with the edge of the short inner steel pipe (1).
8. The construction method of the template-free assembled UHPC-recycled concrete composite column according to claim 1, 2 or 5, wherein the construction method comprises the following steps: the thickness of the UHPC shell (8) is not less than the distance from the inner side surface of the longitudinal steel bar (6) to the outer surface of the superposed column.
9. The construction method of the template-free assembled UHPC-recycled concrete composite column according to claim 1, 2 or 5, wherein the construction method comprises the following steps: the recycled concrete core (9) is recycled concrete doped with recycled aggregate prepared from waste concrete or industrial tailings, or internally cured concrete doped with super absorbent resin material or lightweight aggregate.
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